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CommitLineData
6973dcae
JH
1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
6973dcae 4#include "cache.h"
b2141fc1 5#include "config.h"
284098f1 6#include "tempfile.h"
6973dcae
JH
7#include "quote.h"
8#include "diff.h"
9#include "diffcore.h"
051308f6 10#include "delta.h"
6973dcae 11#include "xdiff-interface.h"
7c92fe0e 12#include "color.h"
8c701249 13#include "attr.h"
d5535ec7 14#include "run-command.h"
23707811 15#include "utf8.h"
cbd53a21 16#include "object-store.h"
be58e70d 17#include "userdiff.h"
851e18c3 18#include "submodule-config.h"
752c0c24 19#include "submodule.h"
2e2d5ac1 20#include "hashmap.h"
a757c646 21#include "ll-merge.h"
02e8ca0e 22#include "string-list.h"
dbbcd44f 23#include "strvec.h"
660e113c 24#include "graph.h"
150e3001 25#include "packfile.h"
4a288478 26#include "parse-options.h"
3ac68a93 27#include "help.h"
b14ed5ad 28#include "promisor-remote.h"
6973dcae 29
1510fea7
SP
30#ifdef NO_FAST_WORKING_DIRECTORY
31#define FAST_WORKING_DIRECTORY 0
32#else
33#define FAST_WORKING_DIRECTORY 1
34#endif
35
96f1e58f 36static int diff_detect_rename_default;
33de7163 37static int diff_indent_heuristic = 1;
94b82d56 38static int diff_rename_limit_default = 1000;
a624eaa7 39static int diff_suppress_blank_empty;
d2aea137 40static int diff_use_color_default = -1;
2e2d5ac1 41static int diff_color_moved_default;
626c0b5d 42static int diff_color_moved_ws_default;
6468a4e5 43static int diff_context_default = 3;
c4888677 44static int diff_interhunk_context_default;
98a4d87b 45static const char *diff_word_regex_cfg;
cbe02100 46static const char *external_diff_cmd_cfg;
6d8940b5 47static const char *diff_order_file_cfg;
aecbf914 48int diff_auto_refresh_index = 1;
a5a818ee 49static int diff_mnemonic_prefix;
f89504dd 50static int diff_no_prefix;
c28ded83 51static int diff_relative;
df44483a 52static int diff_stat_graph_width;
712d2c7d 53static int diff_dirstat_permille_default = 30;
be4f2b40 54static struct diff_options default_diff_options;
07ab4dec 55static long diff_algorithm;
a17505f2 56static unsigned ws_error_highlight_default = WSEH_NEW;
6973dcae 57
7c92fe0e 58static char diff_colors[][COLOR_MAXLEN] = {
dc6ebd4c 59 GIT_COLOR_RESET,
8dbf3eb6 60 GIT_COLOR_NORMAL, /* CONTEXT */
dc6ebd4c
AL
61 GIT_COLOR_BOLD, /* METAINFO */
62 GIT_COLOR_CYAN, /* FRAGINFO */
63 GIT_COLOR_RED, /* OLD */
64 GIT_COLOR_GREEN, /* NEW */
65 GIT_COLOR_YELLOW, /* COMMIT */
66 GIT_COLOR_BG_RED, /* WHITESPACE */
89cb73a1 67 GIT_COLOR_NORMAL, /* FUNCINFO */
86b452e2
SB
68 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
69 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
70 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
71 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
72 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
73 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
74 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
75 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
a7be92ac
JS
76 GIT_COLOR_FAINT, /* CONTEXT_DIM */
77 GIT_COLOR_FAINT_RED, /* OLD_DIM */
78 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
79 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
80 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
81 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
cd112cef
JS
82};
83
a73b3680
NTND
84static const char *color_diff_slots[] = {
85 [DIFF_CONTEXT] = "context",
86 [DIFF_METAINFO] = "meta",
87 [DIFF_FRAGINFO] = "frag",
88 [DIFF_FILE_OLD] = "old",
89 [DIFF_FILE_NEW] = "new",
90 [DIFF_COMMIT] = "commit",
91 [DIFF_WHITESPACE] = "whitespace",
92 [DIFF_FUNCINFO] = "func",
93 [DIFF_FILE_OLD_MOVED] = "oldMoved",
94 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
95 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
96 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
97 [DIFF_FILE_NEW_MOVED] = "newMoved",
98 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
99 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
100 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
a7be92ac
JS
101 [DIFF_CONTEXT_DIM] = "contextDimmed",
102 [DIFF_FILE_OLD_DIM] = "oldDimmed",
103 [DIFF_FILE_NEW_DIM] = "newDimmed",
104 [DIFF_CONTEXT_BOLD] = "contextBold",
105 [DIFF_FILE_OLD_BOLD] = "oldBold",
106 [DIFF_FILE_NEW_BOLD] = "newBold",
a73b3680
NTND
107};
108
3ac68a93
NTND
109define_list_config_array_extra(color_diff_slots, {"plain"});
110
9e1a5ebe 111static int parse_diff_color_slot(const char *var)
801235c5 112{
a73b3680 113 if (!strcasecmp(var, "plain"))
8dbf3eb6 114 return DIFF_CONTEXT;
a73b3680 115 return LOOKUP_CONFIG(color_diff_slots, var);
801235c5
JH
116}
117
02e8ca0e 118static int parse_dirstat_params(struct diff_options *options, const char *params_string,
51670fc8 119 struct strbuf *errmsg)
333f3fb0 120{
02e8ca0e
MH
121 char *params_copy = xstrdup(params_string);
122 struct string_list params = STRING_LIST_INIT_NODUP;
123 int ret = 0;
124 int i;
51670fc8 125
02e8ca0e
MH
126 if (*params_copy)
127 string_list_split_in_place(&params, params_copy, ',', -1);
128 for (i = 0; i < params.nr; i++) {
129 const char *p = params.items[i].string;
130 if (!strcmp(p, "changes")) {
0d1e0e78
BW
131 options->flags.dirstat_by_line = 0;
132 options->flags.dirstat_by_file = 0;
02e8ca0e 133 } else if (!strcmp(p, "lines")) {
0d1e0e78
BW
134 options->flags.dirstat_by_line = 1;
135 options->flags.dirstat_by_file = 0;
02e8ca0e 136 } else if (!strcmp(p, "files")) {
0d1e0e78
BW
137 options->flags.dirstat_by_line = 0;
138 options->flags.dirstat_by_file = 1;
02e8ca0e 139 } else if (!strcmp(p, "noncumulative")) {
0d1e0e78 140 options->flags.dirstat_cumulative = 0;
02e8ca0e 141 } else if (!strcmp(p, "cumulative")) {
0d1e0e78 142 options->flags.dirstat_cumulative = 1;
333f3fb0
JH
143 } else if (isdigit(*p)) {
144 char *end;
51670fc8
JH
145 int permille = strtoul(p, &end, 10) * 10;
146 if (*end == '.' && isdigit(*++end)) {
712d2c7d 147 /* only use first digit */
51670fc8 148 permille += *end - '0';
712d2c7d 149 /* .. and ignore any further digits */
51670fc8 150 while (isdigit(*++end))
712d2c7d
JH
151 ; /* nothing */
152 }
02e8ca0e 153 if (!*end)
51670fc8
JH
154 options->dirstat_permille = permille;
155 else {
02e8ca0e
MH
156 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
157 p);
51670fc8
JH
158 ret++;
159 }
160 } else {
02e8ca0e 161 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
51670fc8 162 ret++;
333f3fb0 163 }
51670fc8 164
333f3fb0 165 }
02e8ca0e
MH
166 string_list_clear(&params, 0);
167 free(params_copy);
51670fc8 168 return ret;
333f3fb0
JH
169}
170
c47ef57c
RR
171static int parse_submodule_params(struct diff_options *options, const char *value)
172{
173 if (!strcmp(value, "log"))
61cfbc05 174 options->submodule_format = DIFF_SUBMODULE_LOG;
c47ef57c 175 else if (!strcmp(value, "short"))
61cfbc05 176 options->submodule_format = DIFF_SUBMODULE_SHORT;
fd47ae6a
JK
177 else if (!strcmp(value, "diff"))
178 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
5a59a230
NTND
179 /*
180 * Please update $__git_diff_submodule_formats in
181 * git-completion.bash when you add new formats.
182 */
c47ef57c
RR
183 else
184 return -1;
185 return 0;
186}
187
85b46030 188int git_config_rename(const char *var, const char *value)
cced5fbc
LT
189{
190 if (!value)
191 return DIFF_DETECT_RENAME;
192 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
193 return DIFF_DETECT_COPY;
194 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
195}
196
07924d4d 197long parse_algorithm_value(const char *value)
07ab4dec
MP
198{
199 if (!value)
200 return -1;
201 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
202 return 0;
203 else if (!strcasecmp(value, "minimal"))
204 return XDF_NEED_MINIMAL;
205 else if (!strcasecmp(value, "patience"))
206 return XDF_PATIENCE_DIFF;
207 else if (!strcasecmp(value, "histogram"))
208 return XDF_HISTOGRAM_DIFF;
5a59a230
NTND
209 /*
210 * Please update $__git_diff_algorithms in git-completion.bash
211 * when you add new algorithms.
212 */
07ab4dec
MP
213 return -1;
214}
215
0b4b42e7
JH
216static int parse_one_token(const char **arg, const char *token)
217{
218 const char *rest;
219 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
220 *arg = rest;
221 return 1;
222 }
223 return 0;
224}
225
226static int parse_ws_error_highlight(const char *arg)
227{
228 const char *orig_arg = arg;
229 unsigned val = 0;
230
231 while (*arg) {
232 if (parse_one_token(&arg, "none"))
233 val = 0;
234 else if (parse_one_token(&arg, "default"))
235 val = WSEH_NEW;
236 else if (parse_one_token(&arg, "all"))
237 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
238 else if (parse_one_token(&arg, "new"))
239 val |= WSEH_NEW;
240 else if (parse_one_token(&arg, "old"))
241 val |= WSEH_OLD;
242 else if (parse_one_token(&arg, "context"))
243 val |= WSEH_CONTEXT;
244 else {
245 return -1 - (int)(arg - orig_arg);
246 }
247 if (*arg)
248 arg++;
249 }
250 return val;
251}
252
83ad63cf
JH
253/*
254 * These are to give UI layer defaults.
255 * The core-level commands such as git-diff-files should
256 * never be affected by the setting of diff.renames
257 * the user happens to have in the configuration file.
258 */
5404c116
MM
259void init_diff_ui_defaults(void)
260{
06dba2b0 261 diff_detect_rename_default = DIFF_DETECT_RENAME;
5404c116
MM
262}
263
5b162879
MH
264int git_diff_heuristic_config(const char *var, const char *value, void *cb)
265{
3cde4e02 266 if (!strcmp(var, "diff.indentheuristic"))
5b162879 267 diff_indent_heuristic = git_config_bool(var, value);
5b162879
MH
268 return 0;
269}
270
2e2d5ac1
SB
271static int parse_color_moved(const char *arg)
272{
273 switch (git_parse_maybe_bool(arg)) {
274 case 0:
275 return COLOR_MOVED_NO;
276 case 1:
277 return COLOR_MOVED_DEFAULT;
278 default:
279 break;
280 }
281
282 if (!strcmp(arg, "no"))
283 return COLOR_MOVED_NO;
176841f0
SB
284 else if (!strcmp(arg, "plain"))
285 return COLOR_MOVED_PLAIN;
51da15eb
SB
286 else if (!strcmp(arg, "blocks"))
287 return COLOR_MOVED_BLOCKS;
2e2d5ac1
SB
288 else if (!strcmp(arg, "zebra"))
289 return COLOR_MOVED_ZEBRA;
290 else if (!strcmp(arg, "default"))
291 return COLOR_MOVED_DEFAULT;
e3f2f5f9
ES
292 else if (!strcmp(arg, "dimmed-zebra"))
293 return COLOR_MOVED_ZEBRA_DIM;
86b452e2
SB
294 else if (!strcmp(arg, "dimmed_zebra"))
295 return COLOR_MOVED_ZEBRA_DIM;
2e2d5ac1 296 else
706b0b5e 297 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
2e2d5ac1
SB
298}
299
d173e799 300static unsigned parse_color_moved_ws(const char *arg)
b3095712
SB
301{
302 int ret = 0;
303 struct string_list l = STRING_LIST_INIT_DUP;
304 struct string_list_item *i;
305
306 string_list_split(&l, arg, ',', -1);
307
308 for_each_string_list_item(i, &l) {
309 struct strbuf sb = STRBUF_INIT;
310 strbuf_addstr(&sb, i->string);
311 strbuf_trim(&sb);
312
b73bcbac
PW
313 if (!strcmp(sb.buf, "no"))
314 ret = 0;
315 else if (!strcmp(sb.buf, "ignore-space-change"))
b3095712
SB
316 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
317 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
318 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
319 else if (!strcmp(sb.buf, "ignore-all-space"))
320 ret |= XDF_IGNORE_WHITESPACE;
ca1f4ae4
SB
321 else if (!strcmp(sb.buf, "allow-indentation-change"))
322 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
d173e799
SB
323 else {
324 ret |= COLOR_MOVED_WS_ERROR;
325 error(_("unknown color-moved-ws mode '%s', possible values are 'ignore-space-change', 'ignore-space-at-eol', 'ignore-all-space', 'allow-indentation-change'"), sb.buf);
326 }
b3095712
SB
327
328 strbuf_release(&sb);
329 }
330
ca1f4ae4 331 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
d173e799 332 (ret & XDF_WHITESPACE_FLAGS)) {
15b07cba 333 error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
d173e799
SB
334 ret |= COLOR_MOVED_WS_ERROR;
335 }
ca1f4ae4 336
b3095712
SB
337 string_list_clear(&l, 0);
338
339 return ret;
2e2d5ac1
SB
340}
341
ef90d6d4 342int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 343{
a159ca0c 344 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
e269eb79 345 diff_use_color_default = git_config_colorbool(var, value);
801235c5
JH
346 return 0;
347 }
2e2d5ac1
SB
348 if (!strcmp(var, "diff.colormoved")) {
349 int cm = parse_color_moved(value);
350 if (cm < 0)
351 return -1;
352 diff_color_moved_default = cm;
353 return 0;
354 }
626c0b5d 355 if (!strcmp(var, "diff.colormovedws")) {
d173e799
SB
356 unsigned cm = parse_color_moved_ws(value);
357 if (cm & COLOR_MOVED_WS_ERROR)
626c0b5d
SB
358 return -1;
359 diff_color_moved_ws_default = cm;
360 return 0;
361 }
6468a4e5
JM
362 if (!strcmp(var, "diff.context")) {
363 diff_context_default = git_config_int(var, value);
364 if (diff_context_default < 0)
365 return -1;
366 return 0;
367 }
c4888677
VN
368 if (!strcmp(var, "diff.interhunkcontext")) {
369 diff_interhunk_context_default = git_config_int(var, value);
370 if (diff_interhunk_context_default < 0)
371 return -1;
372 return 0;
373 }
b68ea12e 374 if (!strcmp(var, "diff.renames")) {
cced5fbc 375 diff_detect_rename_default = git_config_rename(var, value);
b68ea12e
EW
376 return 0;
377 }
aecbf914
JH
378 if (!strcmp(var, "diff.autorefreshindex")) {
379 diff_auto_refresh_index = git_config_bool(var, value);
380 return 0;
381 }
a5a818ee
JH
382 if (!strcmp(var, "diff.mnemonicprefix")) {
383 diff_mnemonic_prefix = git_config_bool(var, value);
384 return 0;
385 }
f89504dd
EC
386 if (!strcmp(var, "diff.noprefix")) {
387 diff_no_prefix = git_config_bool(var, value);
388 return 0;
389 }
c28ded83
LA
390 if (!strcmp(var, "diff.relative")) {
391 diff_relative = git_config_bool(var, value);
392 return 0;
393 }
df44483a
ZJS
394 if (!strcmp(var, "diff.statgraphwidth")) {
395 diff_stat_graph_width = git_config_int(var, value);
396 return 0;
397 }
daec808c
BH
398 if (!strcmp(var, "diff.external"))
399 return git_config_string(&external_diff_cmd_cfg, var, value);
98a4d87b
BSSJ
400 if (!strcmp(var, "diff.wordregex"))
401 return git_config_string(&diff_word_regex_cfg, var, value);
6d8940b5
SB
402 if (!strcmp(var, "diff.orderfile"))
403 return git_config_pathname(&diff_order_file_cfg, var, value);
f1af60bd 404
be4f2b40
JS
405 if (!strcmp(var, "diff.ignoresubmodules"))
406 handle_ignore_submodules_arg(&default_diff_options, value);
407
c47ef57c
RR
408 if (!strcmp(var, "diff.submodule")) {
409 if (parse_submodule_params(&default_diff_options, value))
410 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
411 value);
412 return 0;
413 }
414
07ab4dec
MP
415 if (!strcmp(var, "diff.algorithm")) {
416 diff_algorithm = parse_algorithm_value(value);
417 if (diff_algorithm < 0)
418 return -1;
419 return 0;
420 }
421
33c643bb
JK
422 if (git_color_config(var, value, cb) < 0)
423 return -1;
424
ef90d6d4 425 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
426}
427
ef90d6d4 428int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 429{
ae021d87
JK
430 const char *name;
431
2b6ca6df
LT
432 if (!strcmp(var, "diff.renamelimit")) {
433 diff_rename_limit_default = git_config_int(var, value);
434 return 0;
435 }
436
6680a087
JK
437 if (userdiff_config(var, value) < 0)
438 return -1;
c7534ef4 439
ae021d87
JK
440 if (skip_prefix(var, "diff.color.", &name) ||
441 skip_prefix(var, "color.diff.", &name)) {
442 int slot = parse_diff_color_slot(name);
8b8e8624
JK
443 if (slot < 0)
444 return 0;
64f30e94
JH
445 if (!value)
446 return config_error_nonbool(var);
f6c5a296 447 return color_parse(value, diff_colors[slot]);
801235c5 448 }
f1af60bd 449
da806352
JK
450 if (!strcmp(var, "diff.wserrorhighlight")) {
451 int val = parse_ws_error_highlight(value);
452 if (val < 0)
453 return -1;
454 ws_error_highlight_default = val;
455 return 0;
456 }
457
a624eaa7 458 /* like GNU diff's --suppress-blank-empty option */
950db879
JS
459 if (!strcmp(var, "diff.suppressblankempty") ||
460 /* for backwards compatibility */
461 !strcmp(var, "diff.suppress-blank-empty")) {
a624eaa7
JM
462 diff_suppress_blank_empty = git_config_bool(var, value);
463 return 0;
464 }
465
2d174951 466 if (!strcmp(var, "diff.dirstat")) {
51670fc8 467 struct strbuf errmsg = STRBUF_INIT;
712d2c7d 468 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
51670fc8 469 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
7478ac57 470 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
51670fc8
JH
471 errmsg.buf);
472 strbuf_release(&errmsg);
712d2c7d 473 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
2d174951
JH
474 return 0;
475 }
476
cf5e7722
MB
477 if (git_diff_heuristic_config(var, value, cb) < 0)
478 return -1;
479
3e1dd17a 480 return git_default_config(var, value, cb);
801235c5
JH
481}
482
6973dcae
JH
483static char *quote_two(const char *one, const char *two)
484{
7c37c975
JH
485 int need_one = quote_c_style(one, NULL, NULL, CQUOTE_NODQ);
486 int need_two = quote_c_style(two, NULL, NULL, CQUOTE_NODQ);
f285a2d7 487 struct strbuf res = STRBUF_INIT;
6973dcae
JH
488
489 if (need_one + need_two) {
663af342 490 strbuf_addch(&res, '"');
7c37c975
JH
491 quote_c_style(one, &res, NULL, CQUOTE_NODQ);
492 quote_c_style(two, &res, NULL, CQUOTE_NODQ);
663af342
PH
493 strbuf_addch(&res, '"');
494 } else {
495 strbuf_addstr(&res, one);
496 strbuf_addstr(&res, two);
6973dcae 497 }
b315c5c0 498 return strbuf_detach(&res, NULL);
6973dcae
JH
499}
500
501static const char *external_diff(void)
502{
503 static const char *external_diff_cmd = NULL;
504 static int done_preparing = 0;
505
506 if (done_preparing)
507 return external_diff_cmd;
6776a84d 508 external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
cbe02100
JS
509 if (!external_diff_cmd)
510 external_diff_cmd = external_diff_cmd_cfg;
6973dcae
JH
511 done_preparing = 1;
512 return external_diff_cmd;
513}
514
284098f1
MH
515/*
516 * Keep track of files used for diffing. Sometimes such an entry
517 * refers to a temporary file, sometimes to an existing file, and
518 * sometimes to "/dev/null".
519 */
6973dcae 520static struct diff_tempfile {
284098f1
MH
521 /*
522 * filename external diff should read from, or NULL if this
523 * entry is currently not in use:
524 */
525 const char *name;
526
dc01505f 527 char hex[GIT_MAX_HEXSZ + 1];
6973dcae 528 char mode[10];
284098f1
MH
529
530 /*
531 * If this diff_tempfile instance refers to a temporary file,
532 * this tempfile object is used to manage its lifetime.
533 */
076aa2cb 534 struct tempfile *tempfile;
6973dcae
JH
535} diff_temp[2];
536
6957eb9a 537struct emit_callback {
6957eb9a
JH
538 int color_diff;
539 unsigned ws_rule;
540 int blank_at_eof_in_preimage;
541 int blank_at_eof_in_postimage;
542 int lno_in_preimage;
543 int lno_in_postimage;
6957eb9a
JH
544 const char **label_path;
545 struct diff_words_data *diff_words;
a3c158d4 546 struct diff_options *opt;
3e97c7c6 547 struct strbuf *header;
6957eb9a
JH
548};
549
6973dcae
JH
550static int count_lines(const char *data, int size)
551{
552 int count, ch, completely_empty = 1, nl_just_seen = 0;
553 count = 0;
554 while (0 < size--) {
555 ch = *data++;
556 if (ch == '\n') {
557 count++;
558 nl_just_seen = 1;
559 completely_empty = 0;
560 }
561 else {
562 nl_just_seen = 0;
563 completely_empty = 0;
564 }
565 }
566 if (completely_empty)
567 return 0;
568 if (!nl_just_seen)
569 count++; /* no trailing newline */
570 return count;
571}
572
b78ea5fc
NTND
573static int fill_mmfile(struct repository *r, mmfile_t *mf,
574 struct diff_filespec *one)
6957eb9a
JH
575{
576 if (!DIFF_FILE_VALID(one)) {
577 mf->ptr = (char *)""; /* does not matter */
578 mf->size = 0;
579 return 0;
580 }
1c37e86a 581 else if (diff_populate_filespec(r, one, NULL))
6957eb9a 582 return -1;
bb35fefb 583
6957eb9a
JH
584 mf->ptr = one->data;
585 mf->size = one->size;
586 return 0;
587}
588
abb371a1 589/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
b78ea5fc
NTND
590static unsigned long diff_filespec_size(struct repository *r,
591 struct diff_filespec *one)
abb371a1 592{
1c37e86a
JT
593 struct diff_populate_filespec_options dpf_options = {
594 .check_size_only = 1,
595 };
596
abb371a1
JK
597 if (!DIFF_FILE_VALID(one))
598 return 0;
1c37e86a 599 diff_populate_filespec(r, one, &dpf_options);
abb371a1
JK
600 return one->size;
601}
602
6957eb9a
JH
603static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
604{
605 char *ptr = mf->ptr;
606 long size = mf->size;
607 int cnt = 0;
608
609 if (!size)
610 return cnt;
611 ptr += size - 1; /* pointing at the very end */
612 if (*ptr != '\n')
613 ; /* incomplete line */
614 else
615 ptr--; /* skip the last LF */
616 while (mf->ptr < ptr) {
617 char *prev_eol;
618 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
619 if (*prev_eol == '\n')
620 break;
621 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
622 break;
623 cnt++;
624 ptr = prev_eol - 1;
625 }
626 return cnt;
627}
628
629static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
630 struct emit_callback *ecbdata)
631{
632 int l1, l2, at;
633 unsigned ws_rule = ecbdata->ws_rule;
634 l1 = count_trailing_blank(mf1, ws_rule);
635 l2 = count_trailing_blank(mf2, ws_rule);
636 if (l2 <= l1) {
637 ecbdata->blank_at_eof_in_preimage = 0;
638 ecbdata->blank_at_eof_in_postimage = 0;
639 return;
640 }
641 at = count_lines(mf1->ptr, mf1->size);
642 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
643
644 at = count_lines(mf2->ptr, mf2->size);
645 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
646}
647
f7c3b4e2 648static void emit_line_0(struct diff_options *o,
017ac45e 649 const char *set_sign, const char *set, unsigned reverse, const char *reset,
250f7993 650 int first, const char *line, int len)
6957eb9a
JH
651{
652 int has_trailing_newline, has_trailing_carriage_return;
44410679 653 int needs_reset = 0; /* at the end of the line */
a3c158d4
BY
654 FILE *file = o->file;
655
f103a6fa 656 fputs(diff_line_prefix(o), file);
6957eb9a 657
44410679
SB
658 has_trailing_newline = (len > 0 && line[len-1] == '\n');
659 if (has_trailing_newline)
660 len--;
661
662 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
663 if (has_trailing_carriage_return)
664 len--;
665
666 if (!len && !first)
667 goto end_of_line;
668
669 if (reverse && want_color(o->use_color)) {
670 fputs(GIT_COLOR_REVERSE, file);
671 needs_reset = 1;
250f7993 672 }
6957eb9a 673
44410679
SB
674 if (set_sign) {
675 fputs(set_sign, file);
676 needs_reset = 1;
06a47552 677 }
44410679
SB
678
679 if (first)
680 fputc(first, file);
681
682 if (!len)
683 goto end_of_line;
684
685 if (set) {
686 if (set_sign && set != set_sign)
687 fputs(reset, file);
06a47552 688 fputs(set, file);
44410679 689 needs_reset = 1;
06a47552 690 }
44410679
SB
691 fwrite(line, len, 1, file);
692 needs_reset = 1; /* 'line' may contain color codes. */
693
694end_of_line:
695 if (needs_reset)
696 fputs(reset, file);
6957eb9a
JH
697 if (has_trailing_carriage_return)
698 fputc('\r', file);
699 if (has_trailing_newline)
700 fputc('\n', file);
701}
702
a3c158d4 703static void emit_line(struct diff_options *o, const char *set, const char *reset,
250f7993
JH
704 const char *line, int len)
705{
44410679 706 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
250f7993
JH
707}
708
36a4cefd 709enum diff_symbol {
4eed0ebd
SB
710 DIFF_SYMBOL_BINARY_DIFF_HEADER,
711 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
712 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
713 DIFF_SYMBOL_BINARY_DIFF_BODY,
714 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
0911c475
SB
715 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
716 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
717 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
718 DIFF_SYMBOL_STATS_LINE,
bd033291 719 DIFF_SYMBOL_WORD_DIFF,
30b7e1e7 720 DIFF_SYMBOL_STAT_SEP,
146fdb0d 721 DIFF_SYMBOL_SUMMARY,
f3597138
SB
722 DIFF_SYMBOL_SUBMODULE_ADD,
723 DIFF_SYMBOL_SUBMODULE_DEL,
724 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
725 DIFF_SYMBOL_SUBMODULE_MODIFIED,
726 DIFF_SYMBOL_SUBMODULE_HEADER,
727 DIFF_SYMBOL_SUBMODULE_ERROR,
728 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
5af6ea95 729 DIFF_SYMBOL_REWRITE_DIFF,
4acaaa7a 730 DIFF_SYMBOL_BINARY_FILES,
a29b0a13 731 DIFF_SYMBOL_HEADER,
3ee8b7bf
SB
732 DIFF_SYMBOL_FILEPAIR_PLUS,
733 DIFF_SYMBOL_FILEPAIR_MINUS,
ff958679
SB
734 DIFF_SYMBOL_WORDS_PORCELAIN,
735 DIFF_SYMBOL_WORDS,
091f8e28 736 DIFF_SYMBOL_CONTEXT,
f2bb1218 737 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
091f8e28
SB
738 DIFF_SYMBOL_PLUS,
739 DIFF_SYMBOL_MINUS,
b9cbfde6 740 DIFF_SYMBOL_NO_LF_EOF,
68abc6f1 741 DIFF_SYMBOL_CONTEXT_FRAGINFO,
c64b420b 742 DIFF_SYMBOL_CONTEXT_MARKER,
36a4cefd
SB
743 DIFF_SYMBOL_SEPARATOR
744};
091f8e28
SB
745/*
746 * Flags for content lines:
747 * 0..12 are whitespace rules
748 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
749 * 16 is marking if the line is blank at EOF
750 */
2e2d5ac1
SB
751#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
752#define DIFF_SYMBOL_MOVED_LINE (1<<17)
753#define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
86b452e2 754#define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
091f8e28
SB
755#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
756
e6e045f8
SB
757/*
758 * This struct is used when we need to buffer the output of the diff output.
759 *
760 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
761 * into the pre/post image file. This pointer could be a union with the
762 * line pointer. By storing an offset into the file instead of the literal line,
763 * we can decrease the memory footprint for the buffered output. At first we
764 * may want to only have indirection for the content lines, but we could also
765 * enhance the state for emitting prefabricated lines, e.g. the similarity
766 * score line or hunk/file headers would only need to store a number or path
767 * and then the output can be constructed later on depending on state.
768 */
769struct emitted_diff_symbol {
770 const char *line;
771 int len;
772 int flags;
21536d07
PW
773 int indent_off; /* Offset to first non-whitespace character */
774 int indent_width; /* The visual width of the indentation */
e6e045f8
SB
775 enum diff_symbol s;
776};
777#define EMITTED_DIFF_SYMBOL_INIT {NULL}
778
779struct emitted_diff_symbols {
780 struct emitted_diff_symbol *buf;
781 int nr, alloc;
782};
783#define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
784
785static void append_emitted_diff_symbol(struct diff_options *o,
786 struct emitted_diff_symbol *e)
6957eb9a 787{
e6e045f8
SB
788 struct emitted_diff_symbol *f;
789
790 ALLOC_GROW(o->emitted_symbols->buf,
791 o->emitted_symbols->nr + 1,
792 o->emitted_symbols->alloc);
793 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
794
795 memcpy(f, e, sizeof(struct emitted_diff_symbol));
796 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
6957eb9a
JH
797}
798
2e2d5ac1
SB
799struct moved_entry {
800 struct hashmap_entry ent;
801 const struct emitted_diff_symbol *es;
802 struct moved_entry *next_line;
803};
804
74d156f4
PW
805struct moved_block {
806 struct moved_entry *match;
21536d07 807 int wsd; /* The whitespace delta of this block */
74d156f4
PW
808};
809
810static void moved_block_clear(struct moved_block *b)
811{
21536d07 812 memset(b, 0, sizeof(*b));
74d156f4
PW
813}
814
0cd51e9d
PW
815#define INDENT_BLANKLINE INT_MIN
816
21536d07 817static void fill_es_indent_data(struct emitted_diff_symbol *es)
ca1f4ae4 818{
0cd51e9d 819 unsigned int off = 0, i;
21536d07
PW
820 int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
821 const char *s = es->line;
822 const int len = es->len;
823
824 /* skip any \v \f \r at start of indentation */
825 while (s[off] == '\f' || s[off] == '\v' ||
826 (s[off] == '\r' && off < len - 1))
827 off++;
828
829 /* calculate the visual width of indentation */
830 while(1) {
831 if (s[off] == ' ') {
832 width++;
833 off++;
834 } else if (s[off] == '\t') {
835 width += tab_width - (width % tab_width);
836 while (s[++off] == '\t')
837 width += tab_width;
838 } else {
839 break;
840 }
841 }
842
0cd51e9d
PW
843 /* check if this line is blank */
844 for (i = off; i < len; i++)
845 if (!isspace(s[i]))
846 break;
ca1f4ae4 847
0cd51e9d
PW
848 if (i == len) {
849 es->indent_width = INDENT_BLANKLINE;
850 es->indent_off = len;
851 } else {
852 es->indent_off = off;
853 es->indent_width = width;
854 }
74d156f4
PW
855}
856
ca1f4ae4 857static int compute_ws_delta(const struct emitted_diff_symbol *a,
21536d07
PW
858 const struct emitted_diff_symbol *b,
859 int *out)
ca1f4ae4 860{
21536d07
PW
861 int a_len = a->len,
862 b_len = b->len,
863 a_off = a->indent_off,
864 a_width = a->indent_width,
865 b_off = b->indent_off,
866 b_width = b->indent_width;
867 int delta;
868
0cd51e9d
PW
869 if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) {
870 *out = INDENT_BLANKLINE;
871 return 1;
872 }
873
21536d07
PW
874 if (a->s == DIFF_SYMBOL_PLUS)
875 delta = a_width - b_width;
876 else
877 delta = b_width - a_width;
ca1f4ae4 878
21536d07
PW
879 if (a_len - a_off != b_len - b_off ||
880 memcmp(a->line + a_off, b->line + b_off, a_len - a_off))
fe4516d1
PW
881 return 0;
882
21536d07 883 *out = delta;
ca1f4ae4 884
fe4516d1 885 return 1;
ca1f4ae4
SB
886}
887
888static int cmp_in_block_with_wsd(const struct diff_options *o,
889 const struct moved_entry *cur,
890 const struct moved_entry *match,
74d156f4 891 struct moved_block *pmb,
ca1f4ae4
SB
892 int n)
893{
894 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
7a4252c4 895 int al = cur->es->len, bl = match->es->len, cl = l->len;
ca1f4ae4
SB
896 const char *a = cur->es->line,
897 *b = match->es->line,
898 *c = l->line;
21536d07
PW
899 int a_off = cur->es->indent_off,
900 a_width = cur->es->indent_width,
901 c_off = l->indent_off,
902 c_width = l->indent_width;
903 int delta;
ca1f4ae4
SB
904
905 /*
7a4252c4
PW
906 * We need to check if 'cur' is equal to 'match'. As those
907 * are from the same (+/-) side, we do not need to adjust for
908 * indent changes. However these were found using fuzzy
909 * matching so we do have to check if they are equal. Here we
910 * just check the lengths. We delay calling memcmp() to check
911 * the contents until later as if the length comparison for a
912 * and c fails we can avoid the call all together.
ca1f4ae4 913 */
7a4252c4 914 if (al != bl)
ca1f4ae4
SB
915 return 1;
916
0cd51e9d
PW
917 /* If 'l' and 'cur' are both blank then they match. */
918 if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE)
919 return 0;
ca1f4ae4
SB
920
921 /*
21536d07
PW
922 * The indent changes of the block are known and stored in pmb->wsd;
923 * however we need to check if the indent changes of the current line
924 * match those of the current block and that the text of 'l' and 'cur'
925 * after the indentation match.
ca1f4ae4 926 */
21536d07
PW
927 if (cur->es->s == DIFF_SYMBOL_PLUS)
928 delta = a_width - c_width;
929 else
930 delta = c_width - a_width;
ca1f4ae4 931
0cd51e9d
PW
932 /*
933 * If the previous lines of this block were all blank then set its
934 * whitespace delta.
935 */
936 if (pmb->wsd == INDENT_BLANKLINE)
937 pmb->wsd = delta;
ca1f4ae4 938
21536d07
PW
939 return !(delta == pmb->wsd && al - a_off == cl - c_off &&
940 !memcmp(a, b, al) && !
941 memcmp(a + a_off, c + c_off, al - a_off));
ca1f4ae4 942}
2e2d5ac1 943
ee1df66f 944static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
939af16e
EW
945 const struct hashmap_entry *eptr,
946 const struct hashmap_entry *entry_or_key,
2e2d5ac1
SB
947 const void *keydata)
948{
ee1df66f 949 const struct diff_options *diffopt = hashmap_cmp_fn_data;
939af16e 950 const struct moved_entry *a, *b;
b3095712
SB
951 unsigned flags = diffopt->color_moved_ws_handling
952 & XDF_WHITESPACE_FLAGS;
ee1df66f 953
939af16e
EW
954 a = container_of(eptr, const struct moved_entry, ent);
955 b = container_of(entry_or_key, const struct moved_entry, ent);
956
ca1f4ae4
SB
957 if (diffopt->color_moved_ws_handling &
958 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
959 /*
960 * As there is not specific white space config given,
961 * we'd need to check for a new block, so ignore all
962 * white space. The setup of the white space
963 * configuration for the next block is done else where
964 */
965 flags |= XDF_IGNORE_WHITESPACE;
966
01be97c2
SB
967 return !xdiff_compare_lines(a->es->line, a->es->len,
968 b->es->line, b->es->len,
b3095712 969 flags);
2e2d5ac1
SB
970}
971
972static struct moved_entry *prepare_entry(struct diff_options *o,
973 int line_no)
974{
975 struct moved_entry *ret = xmalloc(sizeof(*ret));
976 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
b3095712 977 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
e010a412 978 unsigned int hash = xdiff_hash_string(l->line, l->len, flags);
2e2d5ac1 979
e010a412 980 hashmap_entry_init(&ret->ent, hash);
2e2d5ac1
SB
981 ret->es = l;
982 ret->next_line = NULL;
983
984 return ret;
985}
986
987static void add_lines_to_move_detection(struct diff_options *o,
988 struct hashmap *add_lines,
989 struct hashmap *del_lines)
990{
991 struct moved_entry *prev_line = NULL;
992
993 int n;
994 for (n = 0; n < o->emitted_symbols->nr; n++) {
995 struct hashmap *hm;
996 struct moved_entry *key;
997
998 switch (o->emitted_symbols->buf[n].s) {
999 case DIFF_SYMBOL_PLUS:
1000 hm = add_lines;
1001 break;
1002 case DIFF_SYMBOL_MINUS:
1003 hm = del_lines;
1004 break;
1005 default:
1006 prev_line = NULL;
1007 continue;
1008 }
1009
21536d07
PW
1010 if (o->color_moved_ws_handling &
1011 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1012 fill_es_indent_data(&o->emitted_symbols->buf[n]);
2e2d5ac1
SB
1013 key = prepare_entry(o, n);
1014 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
1015 prev_line->next_line = key;
1016
b94e5c1d 1017 hashmap_add(hm, &key->ent);
2e2d5ac1
SB
1018 prev_line = key;
1019 }
1020}
1021
e2fe6abc
SB
1022static void pmb_advance_or_null(struct diff_options *o,
1023 struct moved_entry *match,
1024 struct hashmap *hm,
74d156f4 1025 struct moved_block *pmb,
e2fe6abc
SB
1026 int pmb_nr)
1027{
1028 int i;
1029 for (i = 0; i < pmb_nr; i++) {
74d156f4 1030 struct moved_entry *prev = pmb[i].match;
e2fe6abc
SB
1031 struct moved_entry *cur = (prev && prev->next_line) ?
1032 prev->next_line : NULL;
939af16e 1033 if (cur && !hm->cmpfn(o, &cur->ent, &match->ent, NULL)) {
74d156f4 1034 pmb[i].match = cur;
e2fe6abc 1035 } else {
74d156f4 1036 pmb[i].match = NULL;
e2fe6abc
SB
1037 }
1038 }
1039}
1040
ca1f4ae4
SB
1041static void pmb_advance_or_null_multi_match(struct diff_options *o,
1042 struct moved_entry *match,
1043 struct hashmap *hm,
74d156f4 1044 struct moved_block *pmb,
ca1f4ae4
SB
1045 int pmb_nr, int n)
1046{
1047 int i;
1048 char *got_match = xcalloc(1, pmb_nr);
1049
23dee69f 1050 hashmap_for_each_entry_from(hm, match, ent) {
ca1f4ae4 1051 for (i = 0; i < pmb_nr; i++) {
74d156f4 1052 struct moved_entry *prev = pmb[i].match;
ca1f4ae4
SB
1053 struct moved_entry *cur = (prev && prev->next_line) ?
1054 prev->next_line : NULL;
1055 if (!cur)
1056 continue;
74d156f4 1057 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
ca1f4ae4
SB
1058 got_match[i] |= 1;
1059 }
1060 }
1061
1062 for (i = 0; i < pmb_nr; i++) {
1063 if (got_match[i]) {
74d156f4
PW
1064 /* Advance to the next line */
1065 pmb[i].match = pmb[i].match->next_line;
fab01ec5 1066 } else {
74d156f4 1067 moved_block_clear(&pmb[i]);
fab01ec5 1068 }
ca1f4ae4 1069 }
9c1a6c2b
PW
1070
1071 free(got_match);
ca1f4ae4
SB
1072}
1073
74d156f4 1074static int shrink_potential_moved_blocks(struct moved_block *pmb,
2e2d5ac1
SB
1075 int pmb_nr)
1076{
1077 int lp, rp;
1078
1079 /* Shrink the set of potential block to the remaining running */
1080 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
74d156f4 1081 while (lp < pmb_nr && pmb[lp].match)
2e2d5ac1
SB
1082 lp++;
1083 /* lp points at the first NULL now */
1084
74d156f4 1085 while (rp > -1 && !pmb[rp].match)
2e2d5ac1
SB
1086 rp--;
1087 /* rp points at the last non-NULL */
1088
1089 if (lp < pmb_nr && rp > -1 && lp < rp) {
1090 pmb[lp] = pmb[rp];
21536d07 1091 memset(&pmb[rp], 0, sizeof(pmb[rp]));
2e2d5ac1
SB
1092 rp--;
1093 lp++;
1094 }
1095 }
1096
1097 /* Remember the number of running sets */
1098 return rp + 1;
1099}
1100
09153277
JT
1101/*
1102 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1103 *
f0b8fb6e
JT
1104 * Otherwise, if the last block has fewer alphanumeric characters than
1105 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
09153277
JT
1106 * that block.
1107 *
1108 * The last block consists of the (n - block_length)'th line up to but not
1109 * including the nth line.
f0b8fb6e 1110 *
b0a2ba47
PW
1111 * Returns 0 if the last block is empty or is unset by this function, non zero
1112 * otherwise.
1113 *
f0b8fb6e
JT
1114 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1115 * Think of a way to unify them.
09153277 1116 */
b0a2ba47 1117static int adjust_last_block(struct diff_options *o, int n, int block_length)
09153277 1118{
f0b8fb6e
JT
1119 int i, alnum_count = 0;
1120 if (o->color_moved == COLOR_MOVED_PLAIN)
b0a2ba47 1121 return block_length;
f0b8fb6e
JT
1122 for (i = 1; i < block_length + 1; i++) {
1123 const char *c = o->emitted_symbols->buf[n - i].line;
1124 for (; *c; c++) {
1125 if (!isalnum(*c))
1126 continue;
1127 alnum_count++;
1128 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
b0a2ba47 1129 return 1;
f0b8fb6e
JT
1130 }
1131 }
09153277
JT
1132 for (i = 1; i < block_length + 1; i++)
1133 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
b0a2ba47 1134 return 0;
09153277
JT
1135}
1136
2e2d5ac1
SB
1137/* Find blocks of moved code, delegate actual coloring decision to helper */
1138static void mark_color_as_moved(struct diff_options *o,
1139 struct hashmap *add_lines,
1140 struct hashmap *del_lines)
1141{
74d156f4 1142 struct moved_block *pmb = NULL; /* potentially moved blocks */
2e2d5ac1 1143 int pmb_nr = 0, pmb_alloc = 0;
b0a2ba47 1144 int n, flipped_block = 0, block_length = 0;
2e2d5ac1
SB
1145
1146
1147 for (n = 0; n < o->emitted_symbols->nr; n++) {
1148 struct hashmap *hm = NULL;
1149 struct moved_entry *key;
1150 struct moved_entry *match = NULL;
1151 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
b0a2ba47 1152 enum diff_symbol last_symbol = 0;
2e2d5ac1
SB
1153
1154 switch (l->s) {
1155 case DIFF_SYMBOL_PLUS:
1156 hm = del_lines;
1157 key = prepare_entry(o, n);
404ab78e 1158 match = hashmap_get_entry(hm, key, ent, NULL);
2e2d5ac1
SB
1159 free(key);
1160 break;
1161 case DIFF_SYMBOL_MINUS:
1162 hm = add_lines;
1163 key = prepare_entry(o, n);
404ab78e 1164 match = hashmap_get_entry(hm, key, ent, NULL);
2e2d5ac1
SB
1165 free(key);
1166 break;
1167 default:
b0a2ba47 1168 flipped_block = 0;
2e2d5ac1
SB
1169 }
1170
1171 if (!match) {
74d156f4
PW
1172 int i;
1173
09153277 1174 adjust_last_block(o, n, block_length);
74d156f4
PW
1175 for(i = 0; i < pmb_nr; i++)
1176 moved_block_clear(&pmb[i]);
2e2d5ac1
SB
1177 pmb_nr = 0;
1178 block_length = 0;
b0a2ba47
PW
1179 flipped_block = 0;
1180 last_symbol = l->s;
2e2d5ac1
SB
1181 continue;
1182 }
1183
2034b473 1184 if (o->color_moved == COLOR_MOVED_PLAIN) {
b0a2ba47 1185 last_symbol = l->s;
2034b473 1186 l->flags |= DIFF_SYMBOL_MOVED_LINE;
176841f0 1187 continue;
2034b473 1188 }
176841f0 1189
ca1f4ae4
SB
1190 if (o->color_moved_ws_handling &
1191 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1192 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1193 else
1194 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
2e2d5ac1
SB
1195
1196 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1197
1198 if (pmb_nr == 0) {
1199 /*
1200 * The current line is the start of a new block.
1201 * Setup the set of potential blocks.
1202 */
23dee69f 1203 hashmap_for_each_entry_from(hm, match, ent) {
2e2d5ac1 1204 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
ca1f4ae4
SB
1205 if (o->color_moved_ws_handling &
1206 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
74d156f4
PW
1207 if (compute_ws_delta(l, match->es,
1208 &pmb[pmb_nr].wsd))
1209 pmb[pmb_nr++].match = match;
ca1f4ae4 1210 } else {
21536d07 1211 pmb[pmb_nr].wsd = 0;
74d156f4 1212 pmb[pmb_nr++].match = match;
ca1f4ae4 1213 }
2e2d5ac1
SB
1214 }
1215
b0a2ba47
PW
1216 if (adjust_last_block(o, n, block_length) &&
1217 pmb_nr && last_symbol != l->s)
1218 flipped_block = (flipped_block + 1) % 2;
1219 else
1220 flipped_block = 0;
f0b8fb6e 1221
f0b8fb6e 1222 block_length = 0;
2e2d5ac1
SB
1223 }
1224
2034b473
PW
1225 if (pmb_nr) {
1226 block_length++;
2034b473
PW
1227 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1228 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1229 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1230 }
b0a2ba47 1231 last_symbol = l->s;
2e2d5ac1 1232 }
09153277 1233 adjust_last_block(o, n, block_length);
2e2d5ac1 1234
74d156f4
PW
1235 for(n = 0; n < pmb_nr; n++)
1236 moved_block_clear(&pmb[n]);
2e2d5ac1
SB
1237 free(pmb);
1238}
e6e045f8 1239
86b452e2
SB
1240#define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1241 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1242static void dim_moved_lines(struct diff_options *o)
1243{
1244 int n;
1245 for (n = 0; n < o->emitted_symbols->nr; n++) {
1246 struct emitted_diff_symbol *prev = (n != 0) ?
1247 &o->emitted_symbols->buf[n - 1] : NULL;
1248 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1249 struct emitted_diff_symbol *next =
1250 (n < o->emitted_symbols->nr - 1) ?
1251 &o->emitted_symbols->buf[n + 1] : NULL;
1252
1253 /* Not a plus or minus line? */
1254 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1255 continue;
1256
1257 /* Not a moved line? */
1258 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1259 continue;
1260
1261 /*
1262 * If prev or next are not a plus or minus line,
1263 * pretend they don't exist
1264 */
1265 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1266 prev->s != DIFF_SYMBOL_MINUS)
1267 prev = NULL;
1268 if (next && next->s != DIFF_SYMBOL_PLUS &&
1269 next->s != DIFF_SYMBOL_MINUS)
1270 next = NULL;
1271
1272 /* Inside a block? */
1273 if ((prev &&
1274 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1275 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1276 (next &&
1277 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1278 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1279 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1280 continue;
1281 }
1282
1283 /* Check if we are at an interesting bound: */
1284 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1285 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1286 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1287 continue;
1288 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1289 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1290 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1291 continue;
1292
1293 /*
1294 * The boundary to prev and next are not interesting,
1295 * so this line is not interesting as a whole
1296 */
1297 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1298 }
1299}
1300
091f8e28 1301static void emit_line_ws_markup(struct diff_options *o,
9d1e16bf
SB
1302 const char *set_sign, const char *set,
1303 const char *reset,
bc9feb05 1304 int sign_index, const char *line, int len,
091f8e28 1305 unsigned ws_rule, int blank_at_eof)
6957eb9a 1306{
b8767f79 1307 const char *ws = NULL;
bc9feb05 1308 int sign = o->output_indicators[sign_index];
6957eb9a 1309
091f8e28
SB
1310 if (o->ws_error_highlight & ws_rule) {
1311 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
b8767f79
JH
1312 if (!*ws)
1313 ws = NULL;
1314 }
1315
f7c3b4e2 1316 if (!ws && !set_sign)
017ac45e 1317 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
f7c3b4e2 1318 else if (!ws) {
29ef759d 1319 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
f7c3b4e2 1320 } else if (blank_at_eof)
6957eb9a 1321 /* Blank line at EOF - paint '+' as well */
017ac45e 1322 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
6957eb9a
JH
1323 else {
1324 /* Emit just the prefix, then the rest. */
017ac45e 1325 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
f7c3b4e2 1326 sign, "", 0);
091f8e28
SB
1327 ws_check_emit(line, len, ws_rule,
1328 o->file, set, reset, ws);
6957eb9a
JH
1329 }
1330}
1331
e6e045f8
SB
1332static void emit_diff_symbol_from_struct(struct diff_options *o,
1333 struct emitted_diff_symbol *eds)
36a4cefd 1334{
b9cbfde6 1335 static const char *nneof = " No newline at end of file\n";
f7c3b4e2 1336 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
0911c475 1337 struct strbuf sb = STRBUF_INIT;
e6e045f8
SB
1338
1339 enum diff_symbol s = eds->s;
1340 const char *line = eds->line;
1341 int len = eds->len;
1342 unsigned flags = eds->flags;
1343
36a4cefd 1344 switch (s) {
b9cbfde6
SB
1345 case DIFF_SYMBOL_NO_LF_EOF:
1346 context = diff_get_color_opt(o, DIFF_CONTEXT);
1347 reset = diff_get_color_opt(o, DIFF_RESET);
1348 putc('\n', o->file);
017ac45e 1349 emit_line_0(o, context, NULL, 0, reset, '\\',
b9cbfde6
SB
1350 nneof, strlen(nneof));
1351 break;
f3597138
SB
1352 case DIFF_SYMBOL_SUBMODULE_HEADER:
1353 case DIFF_SYMBOL_SUBMODULE_ERROR:
1354 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
0911c475 1355 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
146fdb0d 1356 case DIFF_SYMBOL_SUMMARY:
0911c475 1357 case DIFF_SYMBOL_STATS_LINE:
4eed0ebd 1358 case DIFF_SYMBOL_BINARY_DIFF_BODY:
68abc6f1
SB
1359 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1360 emit_line(o, "", "", line, len);
1361 break;
f2bb1218 1362 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
c64b420b
SB
1363 case DIFF_SYMBOL_CONTEXT_MARKER:
1364 context = diff_get_color_opt(o, DIFF_CONTEXT);
1365 reset = diff_get_color_opt(o, DIFF_RESET);
1366 emit_line(o, context, reset, line, len);
1367 break;
36a4cefd
SB
1368 case DIFF_SYMBOL_SEPARATOR:
1369 fprintf(o->file, "%s%c",
1370 diff_line_prefix(o),
1371 o->line_termination);
1372 break;
091f8e28
SB
1373 case DIFF_SYMBOL_CONTEXT:
1374 set = diff_get_color_opt(o, DIFF_CONTEXT);
1375 reset = diff_get_color_opt(o, DIFF_RESET);
f7c3b4e2
JS
1376 set_sign = NULL;
1377 if (o->flags.dual_color_diffed_diffs) {
1378 char c = !len ? 0 : line[0];
1379
1380 if (c == '+')
1381 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1382 else if (c == '@')
1383 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1384 else if (c == '-')
1385 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1386 }
7648b79e 1387 emit_line_ws_markup(o, set_sign, set, reset,
bc9feb05 1388 OUTPUT_INDICATOR_CONTEXT, line, len,
091f8e28
SB
1389 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1390 break;
1391 case DIFF_SYMBOL_PLUS:
86b452e2
SB
1392 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1393 DIFF_SYMBOL_MOVED_LINE_ALT |
1394 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1395 case DIFF_SYMBOL_MOVED_LINE |
1396 DIFF_SYMBOL_MOVED_LINE_ALT |
1397 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1398 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1399 break;
1400 case DIFF_SYMBOL_MOVED_LINE |
1401 DIFF_SYMBOL_MOVED_LINE_ALT:
2e2d5ac1 1402 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
86b452e2
SB
1403 break;
1404 case DIFF_SYMBOL_MOVED_LINE |
1405 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1406 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1407 break;
1408 case DIFF_SYMBOL_MOVED_LINE:
2e2d5ac1 1409 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
86b452e2
SB
1410 break;
1411 default:
2e2d5ac1 1412 set = diff_get_color_opt(o, DIFF_FILE_NEW);
86b452e2 1413 }
091f8e28 1414 reset = diff_get_color_opt(o, DIFF_RESET);
f7c3b4e2
JS
1415 if (!o->flags.dual_color_diffed_diffs)
1416 set_sign = NULL;
1417 else {
1418 char c = !len ? 0 : line[0];
1419
1420 set_sign = set;
1421 if (c == '-')
a7be92ac 1422 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
f7c3b4e2
JS
1423 else if (c == '@')
1424 set = diff_get_color_opt(o, DIFF_FRAGINFO);
a7be92ac
JS
1425 else if (c == '+')
1426 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1427 else
1428 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
0b91faa0 1429 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
f7c3b4e2 1430 }
7648b79e 1431 emit_line_ws_markup(o, set_sign, set, reset,
bc9feb05 1432 OUTPUT_INDICATOR_NEW, line, len,
091f8e28
SB
1433 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1434 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1435 break;
1436 case DIFF_SYMBOL_MINUS:
86b452e2
SB
1437 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1438 DIFF_SYMBOL_MOVED_LINE_ALT |
1439 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1440 case DIFF_SYMBOL_MOVED_LINE |
1441 DIFF_SYMBOL_MOVED_LINE_ALT |
1442 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1443 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1444 break;
1445 case DIFF_SYMBOL_MOVED_LINE |
1446 DIFF_SYMBOL_MOVED_LINE_ALT:
2e2d5ac1 1447 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
86b452e2
SB
1448 break;
1449 case DIFF_SYMBOL_MOVED_LINE |
1450 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1451 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1452 break;
1453 case DIFF_SYMBOL_MOVED_LINE:
2e2d5ac1 1454 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
86b452e2
SB
1455 break;
1456 default:
2e2d5ac1 1457 set = diff_get_color_opt(o, DIFF_FILE_OLD);
86b452e2 1458 }
091f8e28 1459 reset = diff_get_color_opt(o, DIFF_RESET);
f7c3b4e2
JS
1460 if (!o->flags.dual_color_diffed_diffs)
1461 set_sign = NULL;
1462 else {
1463 char c = !len ? 0 : line[0];
1464
1465 set_sign = set;
1466 if (c == '+')
a7be92ac 1467 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
f7c3b4e2
JS
1468 else if (c == '@')
1469 set = diff_get_color_opt(o, DIFF_FRAGINFO);
a7be92ac
JS
1470 else if (c == '-')
1471 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1472 else
1473 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
f7c3b4e2 1474 }
7648b79e 1475 emit_line_ws_markup(o, set_sign, set, reset,
bc9feb05 1476 OUTPUT_INDICATOR_OLD, line, len,
091f8e28
SB
1477 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1478 break;
ff958679
SB
1479 case DIFF_SYMBOL_WORDS_PORCELAIN:
1480 context = diff_get_color_opt(o, DIFF_CONTEXT);
1481 reset = diff_get_color_opt(o, DIFF_RESET);
1482 emit_line(o, context, reset, line, len);
1483 fputs("~\n", o->file);
1484 break;
1485 case DIFF_SYMBOL_WORDS:
1486 context = diff_get_color_opt(o, DIFF_CONTEXT);
1487 reset = diff_get_color_opt(o, DIFF_RESET);
1488 /*
1489 * Skip the prefix character, if any. With
1490 * diff_suppress_blank_empty, there may be
1491 * none.
1492 */
1493 if (line[0] != '\n') {
1494 line++;
1495 len--;
1496 }
1497 emit_line(o, context, reset, line, len);
1498 break;
3ee8b7bf
SB
1499 case DIFF_SYMBOL_FILEPAIR_PLUS:
1500 meta = diff_get_color_opt(o, DIFF_METAINFO);
1501 reset = diff_get_color_opt(o, DIFF_RESET);
1502 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1503 line, reset,
1504 strchr(line, ' ') ? "\t" : "");
1505 break;
1506 case DIFF_SYMBOL_FILEPAIR_MINUS:
1507 meta = diff_get_color_opt(o, DIFF_METAINFO);
1508 reset = diff_get_color_opt(o, DIFF_RESET);
1509 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1510 line, reset,
1511 strchr(line, ' ') ? "\t" : "");
1512 break;
4acaaa7a 1513 case DIFF_SYMBOL_BINARY_FILES:
a29b0a13
SB
1514 case DIFF_SYMBOL_HEADER:
1515 fprintf(o->file, "%s", line);
1516 break;
4eed0ebd
SB
1517 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1518 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1519 break;
1520 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1521 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1522 break;
1523 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1524 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1525 break;
1526 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1527 fputs(diff_line_prefix(o), o->file);
1528 fputc('\n', o->file);
1529 break;
5af6ea95
SB
1530 case DIFF_SYMBOL_REWRITE_DIFF:
1531 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1532 reset = diff_get_color_opt(o, DIFF_RESET);
1533 emit_line(o, fraginfo, reset, line, len);
1534 break;
f3597138
SB
1535 case DIFF_SYMBOL_SUBMODULE_ADD:
1536 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1537 reset = diff_get_color_opt(o, DIFF_RESET);
1538 emit_line(o, set, reset, line, len);
1539 break;
1540 case DIFF_SYMBOL_SUBMODULE_DEL:
1541 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1542 reset = diff_get_color_opt(o, DIFF_RESET);
1543 emit_line(o, set, reset, line, len);
1544 break;
1545 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1546 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1547 diff_line_prefix(o), line);
1548 break;
1549 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1550 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1551 diff_line_prefix(o), line);
1552 break;
0911c475
SB
1553 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1554 emit_line(o, "", "", " 0 files changed\n",
1555 strlen(" 0 files changed\n"));
1556 break;
1557 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1558 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1559 break;
bd033291
SB
1560 case DIFF_SYMBOL_WORD_DIFF:
1561 fprintf(o->file, "%.*s", len, line);
1562 break;
30b7e1e7
SB
1563 case DIFF_SYMBOL_STAT_SEP:
1564 fputs(o->stat_sep, o->file);
1565 break;
36a4cefd 1566 default:
033abf97 1567 BUG("unknown diff symbol");
36a4cefd 1568 }
0911c475 1569 strbuf_release(&sb);
36a4cefd
SB
1570}
1571
e6e045f8
SB
1572static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1573 const char *line, int len, unsigned flags)
1574{
21536d07 1575 struct emitted_diff_symbol e = {line, len, flags, 0, 0, s};
e6e045f8
SB
1576
1577 if (o->emitted_symbols)
1578 append_emitted_diff_symbol(o, &e);
1579 else
1580 emit_diff_symbol_from_struct(o, &e);
1581}
1582
f3597138
SB
1583void diff_emit_submodule_del(struct diff_options *o, const char *line)
1584{
1585 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1586}
1587
1588void diff_emit_submodule_add(struct diff_options *o, const char *line)
1589{
1590 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1591}
1592
1593void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1594{
1595 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1596 path, strlen(path), 0);
1597}
1598
1599void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1600{
1601 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1602 path, strlen(path), 0);
1603}
1604
1605void diff_emit_submodule_header(struct diff_options *o, const char *header)
1606{
1607 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1608 header, strlen(header), 0);
1609}
1610
1611void diff_emit_submodule_error(struct diff_options *o, const char *err)
1612{
1613 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1614}
1615
1616void diff_emit_submodule_pipethrough(struct diff_options *o,
1617 const char *line, int len)
1618{
1619 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1620}
1621
6957eb9a
JH
1622static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1623{
1624 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1625 ecbdata->blank_at_eof_in_preimage &&
1626 ecbdata->blank_at_eof_in_postimage &&
1627 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1628 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1629 return 0;
018cff70 1630 return ws_blank_line(line, len, ecbdata->ws_rule);
6957eb9a
JH
1631}
1632
e04df612 1633static void emit_add_line(struct emit_callback *ecbdata,
0e383e18
JH
1634 const char *line, int len)
1635{
091f8e28
SB
1636 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1637 if (new_blank_line_at_eof(ecbdata, line, len))
1638 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1639
1640 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
b8767f79 1641}
0e383e18 1642
e04df612 1643static void emit_del_line(struct emit_callback *ecbdata,
b8767f79
JH
1644 const char *line, int len)
1645{
091f8e28
SB
1646 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1647 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
0e383e18
JH
1648}
1649
e04df612 1650static void emit_context_line(struct emit_callback *ecbdata,
0e383e18
JH
1651 const char *line, int len)
1652{
091f8e28
SB
1653 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1654 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
0e383e18
JH
1655}
1656
89cb73a1
BW
1657static void emit_hunk_header(struct emit_callback *ecbdata,
1658 const char *line, int len)
1659{
8dbf3eb6 1660 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
89cb73a1
BW
1661 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1662 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1663 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
f7c3b4e2 1664 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
89cb73a1
BW
1665 static const char atat[2] = { '@', '@' };
1666 const char *cp, *ep;
2efcc977
BY
1667 struct strbuf msgbuf = STRBUF_INIT;
1668 int org_len = len;
1669 int i = 1;
89cb73a1
BW
1670
1671 /*
1672 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1673 * it always is at least 10 bytes long.
1674 */
1675 if (len < 10 ||
1676 memcmp(line, atat, 2) ||
1677 !(ep = memmem(line + 2, len - 2, atat, 2))) {
c64b420b 1678 emit_diff_symbol(ecbdata->opt,
091f8e28 1679 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
89cb73a1
BW
1680 return;
1681 }
1682 ep += 2; /* skip over @@ */
1683
1684 /* The hunk header in fraginfo color */
f7c3b4e2
JS
1685 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1686 strbuf_addstr(&msgbuf, reverse);
cedc61a9 1687 strbuf_addstr(&msgbuf, frag);
430be36e
TG
1688 if (ecbdata->opt->flags.suppress_hunk_header_line_count)
1689 strbuf_add(&msgbuf, atat, sizeof(atat));
1690 else
1691 strbuf_add(&msgbuf, line, ep - line);
cedc61a9 1692 strbuf_addstr(&msgbuf, reset);
2efcc977
BY
1693
1694 /*
1695 * trailing "\r\n"
1696 */
1697 for ( ; i < 3; i++)
1698 if (line[len - i] == '\r' || line[len - i] == '\n')
1699 len--;
89cb73a1
BW
1700
1701 /* blank before the func header */
1702 for (cp = ep; ep - line < len; ep++)
1703 if (*ep != ' ' && *ep != '\t')
1704 break;
2efcc977 1705 if (ep != cp) {
8dbf3eb6 1706 strbuf_addstr(&msgbuf, context);
2efcc977 1707 strbuf_add(&msgbuf, cp, ep - cp);
cedc61a9 1708 strbuf_addstr(&msgbuf, reset);
2efcc977
BY
1709 }
1710
1711 if (ep < line + len) {
cedc61a9 1712 strbuf_addstr(&msgbuf, func);
2efcc977 1713 strbuf_add(&msgbuf, ep, line + len - ep);
cedc61a9 1714 strbuf_addstr(&msgbuf, reset);
2efcc977 1715 }
89cb73a1 1716
2efcc977 1717 strbuf_add(&msgbuf, line + len, org_len - len);
dfb7728f 1718 strbuf_complete_line(&msgbuf);
68abc6f1 1719 emit_diff_symbol(ecbdata->opt,
091f8e28 1720 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
2efcc977 1721 strbuf_release(&msgbuf);
89cb73a1
BW
1722}
1723
3b335762
NTND
1724static struct diff_tempfile *claim_diff_tempfile(void)
1725{
479b0ae8
JK
1726 int i;
1727 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1728 if (!diff_temp[i].name)
1729 return diff_temp + i;
033abf97 1730 BUG("diff is failing to clean up its tempfiles");
479b0ae8
JK
1731}
1732
479b0ae8
JK
1733static void remove_tempfile(void)
1734{
1735 int i;
a8344abe 1736 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
076aa2cb 1737 if (is_tempfile_active(diff_temp[i].tempfile))
284098f1 1738 delete_tempfile(&diff_temp[i].tempfile);
a8344abe
NR
1739 diff_temp[i].name = NULL;
1740 }
479b0ae8
JK
1741}
1742
5af6ea95 1743static void add_line_count(struct strbuf *out, int count)
6973dcae
JH
1744{
1745 switch (count) {
1746 case 0:
5af6ea95 1747 strbuf_addstr(out, "0,0");
6973dcae
JH
1748 break;
1749 case 1:
5af6ea95 1750 strbuf_addstr(out, "1");
6973dcae
JH
1751 break;
1752 default:
5af6ea95 1753 strbuf_addf(out, "1,%d", count);
6973dcae
JH
1754 break;
1755 }
1756}
1757
7f7ee2ff
JH
1758static void emit_rewrite_lines(struct emit_callback *ecb,
1759 int prefix, const char *data, int size)
6973dcae 1760{
7f7ee2ff 1761 const char *endp = NULL;
7f7ee2ff
JH
1762
1763 while (0 < size) {
1764 int len;
1765
1766 endp = memchr(data, '\n', size);
1767 len = endp ? (endp - data + 1) : size;
1768 if (prefix != '+') {
1769 ecb->lno_in_preimage++;
e04df612 1770 emit_del_line(ecb, data, len);
7f7ee2ff
JH
1771 } else {
1772 ecb->lno_in_postimage++;
e04df612 1773 emit_add_line(ecb, data, len);
13e36ec5 1774 }
7f7ee2ff
JH
1775 size -= len;
1776 data += len;
1777 }
b9cbfde6 1778 if (!endp)
091f8e28 1779 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
6973dcae
JH
1780}
1781
1782static void emit_rewrite_diff(const char *name_a,
1783 const char *name_b,
1784 struct diff_filespec *one,
13e36ec5 1785 struct diff_filespec *two,
d9bae1a1
JK
1786 struct userdiff_driver *textconv_one,
1787 struct userdiff_driver *textconv_two,
eab9a40b 1788 struct diff_options *o)
6973dcae
JH
1789{
1790 int lc_a, lc_b;
d5625091 1791 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
a5a818ee 1792 const char *a_prefix, *b_prefix;
840383b2 1793 char *data_one, *data_two;
3aa1f7ca 1794 size_t size_one, size_two;
7f7ee2ff 1795 struct emit_callback ecbdata;
5af6ea95 1796 struct strbuf out = STRBUF_INIT;
a5a818ee 1797
0d1e0e78 1798 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
a5a818ee
JH
1799 a_prefix = o->b_prefix;
1800 b_prefix = o->a_prefix;
1801 } else {
1802 a_prefix = o->a_prefix;
1803 b_prefix = o->b_prefix;
1804 }
1a9eb3b9 1805
8a13becc
JH
1806 name_a += (*name_a == '/');
1807 name_b += (*name_b == '/');
1a9eb3b9 1808
d5625091
JH
1809 strbuf_reset(&a_name);
1810 strbuf_reset(&b_name);
a5a818ee
JH
1811 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1812 quote_two_c_style(&b_name, b_prefix, name_b, 0);
d5625091 1813
6afaf807
NTND
1814 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1815 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
3aa1f7ca 1816
d91ba8fa 1817 memset(&ecbdata, 0, sizeof(ecbdata));
daa0c3d9 1818 ecbdata.color_diff = want_color(o->use_color);
26d024ec 1819 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
a3c158d4 1820 ecbdata.opt = o;
d91ba8fa
JH
1821 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1822 mmfile_t mf1, mf2;
1823 mf1.ptr = (char *)data_one;
1824 mf2.ptr = (char *)data_two;
1825 mf1.size = size_one;
1826 mf2.size = size_two;
1827 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1828 }
1829 ecbdata.lno_in_preimage = 1;
1830 ecbdata.lno_in_postimage = 1;
1831
3aa1f7ca
JK
1832 lc_a = count_lines(data_one, size_one);
1833 lc_b = count_lines(data_two, size_two);
3ee8b7bf
SB
1834
1835 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1836 a_name.buf, a_name.len, 0);
1837 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1838 b_name.buf, b_name.len, 0);
1839
5af6ea95 1840 strbuf_addstr(&out, "@@ -");
467ddc14 1841 if (!o->irreversible_delete)
5af6ea95 1842 add_line_count(&out, lc_a);
467ddc14 1843 else
5af6ea95
SB
1844 strbuf_addstr(&out, "?,?");
1845 strbuf_addstr(&out, " +");
1846 add_line_count(&out, lc_b);
1847 strbuf_addstr(&out, " @@\n");
1848 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1849 strbuf_release(&out);
1850
467ddc14 1851 if (lc_a && !o->irreversible_delete)
d91ba8fa 1852 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
6973dcae 1853 if (lc_b)
d91ba8fa 1854 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
b76c056b 1855 if (textconv_one)
aed6ca52 1856 free((char *)data_one);
b76c056b 1857 if (textconv_two)
aed6ca52 1858 free((char *)data_two);
6973dcae
JH
1859}
1860
f59a59e2
JS
1861struct diff_words_buffer {
1862 mmfile_t text;
071bcaab 1863 unsigned long alloc;
2e5d2003
JS
1864 struct diff_words_orig {
1865 const char *begin, *end;
1866 } *orig;
1867 int orig_nr, orig_alloc;
f59a59e2
JS
1868};
1869
1870static void diff_words_append(char *line, unsigned long len,
1871 struct diff_words_buffer *buffer)
1872{
23c1575f 1873 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
f59a59e2
JS
1874 line++;
1875 len--;
1876 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1877 buffer->text.size += len;
2b6a5417 1878 buffer->text.ptr[buffer->text.size] = '\0';
f59a59e2
JS
1879}
1880
9cba13ca 1881struct diff_words_style_elem {
882749a0
TR
1882 const char *prefix;
1883 const char *suffix;
1884 const char *color; /* NULL; filled in by the setup code if
1885 * color is enabled */
1886};
1887
9cba13ca 1888struct diff_words_style {
882749a0 1889 enum diff_words_type type;
63a01c3f 1890 struct diff_words_style_elem new_word, old_word, ctx;
882749a0
TR
1891 const char *newline;
1892};
1893
c2e86add 1894static struct diff_words_style diff_words_styles[] = {
882749a0
TR
1895 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1896 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1897 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1898};
1899
f59a59e2 1900struct diff_words_data {
f59a59e2 1901 struct diff_words_buffer minus, plus;
2e5d2003 1902 const char *current_plus;
4297c0ae
BY
1903 int last_minus;
1904 struct diff_options *opt;
2b6a5417 1905 regex_t *word_regex;
882749a0
TR
1906 enum diff_words_type type;
1907 struct diff_words_style *style;
f59a59e2
JS
1908};
1909
bd033291 1910static int fn_out_diff_words_write_helper(struct diff_options *o,
882749a0
TR
1911 struct diff_words_style_elem *st_el,
1912 const char *newline,
bd033291 1913 size_t count, const char *buf)
882749a0 1914{
4297c0ae 1915 int print = 0;
bd033291 1916 struct strbuf sb = STRBUF_INIT;
4297c0ae 1917
882749a0
TR
1918 while (count) {
1919 char *p = memchr(buf, '\n', count);
4297c0ae 1920 if (print)
bd033291
SB
1921 strbuf_addstr(&sb, diff_line_prefix(o));
1922
882749a0 1923 if (p != buf) {
bd033291
SB
1924 const char *reset = st_el->color && *st_el->color ?
1925 GIT_COLOR_RESET : NULL;
1926 if (st_el->color && *st_el->color)
1927 strbuf_addstr(&sb, st_el->color);
1928 strbuf_addstr(&sb, st_el->prefix);
1929 strbuf_add(&sb, buf, p ? p - buf : count);
1930 strbuf_addstr(&sb, st_el->suffix);
1931 if (reset)
1932 strbuf_addstr(&sb, reset);
882749a0
TR
1933 }
1934 if (!p)
bd033291
SB
1935 goto out;
1936
1937 strbuf_addstr(&sb, newline);
882749a0
TR
1938 count -= p + 1 - buf;
1939 buf = p + 1;
4297c0ae 1940 print = 1;
bd033291
SB
1941 if (count) {
1942 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1943 sb.buf, sb.len, 0);
1944 strbuf_reset(&sb);
1945 }
882749a0 1946 }
bd033291
SB
1947
1948out:
1949 if (sb.len)
1950 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1951 sb.buf, sb.len, 0);
1952 strbuf_release(&sb);
882749a0
TR
1953 return 0;
1954}
1955
4297c0ae
BY
1956/*
1957 * '--color-words' algorithm can be described as:
1958 *
5621760f 1959 * 1. collect the minus/plus lines of a diff hunk, divided into
4297c0ae
BY
1960 * minus-lines and plus-lines;
1961 *
1962 * 2. break both minus-lines and plus-lines into words and
1963 * place them into two mmfile_t with one word for each line;
1964 *
1965 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1966 *
1967 * And for the common parts of the both file, we output the plus side text.
1968 * diff_words->current_plus is used to trace the current position of the plus file
1969 * which printed. diff_words->last_minus is used to trace the last minus word
1970 * printed.
1971 *
1972 * For '--graph' to work with '--color-words', we need to output the graph prefix
1973 * on each line of color words output. Generally, there are two conditions on
1974 * which we should output the prefix.
1975 *
1976 * 1. diff_words->last_minus == 0 &&
1977 * diff_words->current_plus == diff_words->plus.text.ptr
1978 *
1979 * that is: the plus text must start as a new line, and if there is no minus
1980 * word printed, a graph prefix must be printed.
1981 *
1982 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1983 * *(diff_words->current_plus - 1) == '\n'
1984 *
1985 * that is: a graph prefix must be printed following a '\n'
1986 */
1987static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1988{
1989 if ((diff_words->last_minus == 0 &&
1990 diff_words->current_plus == diff_words->plus.text.ptr) ||
1991 (diff_words->current_plus > diff_words->plus.text.ptr &&
1992 *(diff_words->current_plus - 1) == '\n')) {
1993 return 1;
1994 } else {
1995 return 0;
1996 }
1997}
1998
7c61e25f
JK
1999static void fn_out_diff_words_aux(void *priv,
2000 long minus_first, long minus_len,
2001 long plus_first, long plus_len,
2002 const char *func, long funclen)
f59a59e2 2003{
f59a59e2 2004 struct diff_words_data *diff_words = priv;
882749a0 2005 struct diff_words_style *style = diff_words->style;
2e5d2003 2006 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
4297c0ae 2007 struct diff_options *opt = diff_words->opt;
30997bb8 2008 const char *line_prefix;
f59a59e2 2009
4297c0ae 2010 assert(opt);
30997bb8 2011 line_prefix = diff_line_prefix(opt);
4297c0ae 2012
2e5d2003
JS
2013 /* POSIX requires that first be decremented by one if len == 0... */
2014 if (minus_len) {
2015 minus_begin = diff_words->minus.orig[minus_first].begin;
2016 minus_end =
2017 diff_words->minus.orig[minus_first + minus_len - 1].end;
2018 } else
2019 minus_begin = minus_end =
2020 diff_words->minus.orig[minus_first].end;
2021
2022 if (plus_len) {
2023 plus_begin = diff_words->plus.orig[plus_first].begin;
2024 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
2025 } else
2026 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
2027
4297c0ae
BY
2028 if (color_words_output_graph_prefix(diff_words)) {
2029 fputs(line_prefix, diff_words->opt->file);
2030 }
2031 if (diff_words->current_plus != plus_begin) {
bd033291 2032 fn_out_diff_words_write_helper(diff_words->opt,
882749a0
TR
2033 &style->ctx, style->newline,
2034 plus_begin - diff_words->current_plus,
bd033291 2035 diff_words->current_plus);
4297c0ae
BY
2036 }
2037 if (minus_begin != minus_end) {
bd033291 2038 fn_out_diff_words_write_helper(diff_words->opt,
63a01c3f 2039 &style->old_word, style->newline,
bd033291 2040 minus_end - minus_begin, minus_begin);
4297c0ae
BY
2041 }
2042 if (plus_begin != plus_end) {
bd033291 2043 fn_out_diff_words_write_helper(diff_words->opt,
63a01c3f 2044 &style->new_word, style->newline,
bd033291 2045 plus_end - plus_begin, plus_begin);
4297c0ae 2046 }
2e5d2003
JS
2047
2048 diff_words->current_plus = plus_end;
4297c0ae 2049 diff_words->last_minus = minus_first;
f59a59e2
JS
2050}
2051
2b6a5417
JS
2052/* This function starts looking at *begin, and returns 0 iff a word was found. */
2053static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
2054 int *begin, int *end)
2055{
0324e8fc 2056 while (word_regex && *begin < buffer->size) {
2b6a5417 2057 regmatch_t match[1];
b7d36ffc
JS
2058 if (!regexec_buf(word_regex, buffer->ptr + *begin,
2059 buffer->size - *begin, 1, match, 0)) {
2b6a5417
JS
2060 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
2061 '\n', match[0].rm_eo - match[0].rm_so);
2062 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
2063 *begin += match[0].rm_so;
0324e8fc
PW
2064 if (*begin == *end)
2065 (*begin)++;
2066 else
2067 return *begin > *end;
2068 } else {
2069 return -1;
2b6a5417 2070 }
f59a59e2
JS
2071 }
2072
2b6a5417
JS
2073 /* find the next word */
2074 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2075 (*begin)++;
2076 if (*begin >= buffer->size)
2077 return -1;
f59a59e2 2078
2b6a5417
JS
2079 /* find the end of the word */
2080 *end = *begin + 1;
2081 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2082 (*end)++;
2083
2084 return 0;
f59a59e2
JS
2085}
2086
23c1575f 2087/*
2e5d2003
JS
2088 * This function splits the words in buffer->text, stores the list with
2089 * newline separator into out, and saves the offsets of the original words
2090 * in buffer->orig.
23c1575f 2091 */
2b6a5417
JS
2092static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2093 regex_t *word_regex)
f59a59e2 2094{
2e5d2003 2095 int i, j;
2b6a5417 2096 long alloc = 0;
f59a59e2 2097
2e5d2003 2098 out->size = 0;
2b6a5417 2099 out->ptr = NULL;
f59a59e2 2100
2e5d2003
JS
2101 /* fake an empty "0th" word */
2102 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2103 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2104 buffer->orig_nr = 1;
2105
2106 for (i = 0; i < buffer->text.size; i++) {
2b6a5417
JS
2107 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2108 return;
2e5d2003
JS
2109
2110 /* store original boundaries */
2111 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2112 buffer->orig_alloc);
2113 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2114 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2115 buffer->orig_nr++;
2116
2117 /* store one word */
2b6a5417 2118 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2e5d2003
JS
2119 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2120 out->ptr[out->size + j - i] = '\n';
2121 out->size += j - i + 1;
2122
2123 i = j - 1;
f59a59e2
JS
2124 }
2125}
2126
2127/* this executes the word diff on the accumulated buffers */
2128static void diff_words_show(struct diff_words_data *diff_words)
2129{
2130 xpparam_t xpp;
2131 xdemitconf_t xecfg;
f59a59e2 2132 mmfile_t minus, plus;
882749a0 2133 struct diff_words_style *style = diff_words->style;
f59a59e2 2134
4297c0ae 2135 struct diff_options *opt = diff_words->opt;
30997bb8 2136 const char *line_prefix;
4297c0ae
BY
2137
2138 assert(opt);
30997bb8 2139 line_prefix = diff_line_prefix(opt);
4297c0ae 2140
2e5d2003
JS
2141 /* special case: only removal */
2142 if (!diff_words->plus.text.size) {
bd033291
SB
2143 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2144 line_prefix, strlen(line_prefix), 0);
2145 fn_out_diff_words_write_helper(diff_words->opt,
63a01c3f 2146 &style->old_word, style->newline,
4297c0ae 2147 diff_words->minus.text.size,
bd033291 2148 diff_words->minus.text.ptr);
2e5d2003
JS
2149 diff_words->minus.text.size = 0;
2150 return;
2151 }
2152
2153 diff_words->current_plus = diff_words->plus.text.ptr;
4297c0ae 2154 diff_words->last_minus = 0;
f59a59e2 2155
9ccd0a88 2156 memset(&xpp, 0, sizeof(xpp));
30b25010 2157 memset(&xecfg, 0, sizeof(xecfg));
2b6a5417
JS
2158 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2159 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
582aa00b 2160 xpp.flags = 0;
2b6a5417 2161 /* as only the hunk header will be parsed, we need a 0-context */
2e5d2003 2162 xecfg.ctxlen = 0;
7c61e25f 2163 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
9346d6d1 2164 diff_words, &xpp, &xecfg))
3efb9880 2165 die("unable to generate word diff");
f59a59e2
JS
2166 free(minus.ptr);
2167 free(plus.ptr);
2e5d2003 2168 if (diff_words->current_plus != diff_words->plus.text.ptr +
4297c0ae
BY
2169 diff_words->plus.text.size) {
2170 if (color_words_output_graph_prefix(diff_words))
bd033291
SB
2171 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2172 line_prefix, strlen(line_prefix), 0);
2173 fn_out_diff_words_write_helper(diff_words->opt,
882749a0 2174 &style->ctx, style->newline,
2e5d2003 2175 diff_words->plus.text.ptr + diff_words->plus.text.size
bd033291 2176 - diff_words->current_plus, diff_words->current_plus);
4297c0ae 2177 }
f59a59e2 2178 diff_words->minus.text.size = diff_words->plus.text.size = 0;
f59a59e2
JS
2179}
2180
76fd2828
JH
2181/* In "color-words" mode, show word-diff of words accumulated in the buffer */
2182static void diff_words_flush(struct emit_callback *ecbdata)
2183{
e6e045f8
SB
2184 struct diff_options *wo = ecbdata->diff_words->opt;
2185
76fd2828
JH
2186 if (ecbdata->diff_words->minus.text.size ||
2187 ecbdata->diff_words->plus.text.size)
2188 diff_words_show(ecbdata->diff_words);
e6e045f8
SB
2189
2190 if (wo->emitted_symbols) {
2191 struct diff_options *o = ecbdata->opt;
2192 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2193 int i;
2194
2195 /*
2196 * NEEDSWORK:
2197 * Instead of appending each, concat all words to a line?
2198 */
2199 for (i = 0; i < wol->nr; i++)
2200 append_emitted_diff_symbol(o, &wol->buf[i]);
2201
2202 for (i = 0; i < wol->nr; i++)
2203 free((void *)wol->buf[i].line);
2204
2205 wol->nr = 0;
2206 }
76fd2828
JH
2207}
2208
acd00ea0
NTND
2209static void diff_filespec_load_driver(struct diff_filespec *one,
2210 struct index_state *istate)
77d1a520
TR
2211{
2212 /* Use already-loaded driver */
2213 if (one->driver)
2214 return;
2215
2216 if (S_ISREG(one->mode))
acd00ea0 2217 one->driver = userdiff_find_by_path(istate, one->path);
77d1a520
TR
2218
2219 /* Fallback to default settings */
2220 if (!one->driver)
2221 one->driver = userdiff_find_by_name("default");
2222}
2223
acd00ea0
NTND
2224static const char *userdiff_word_regex(struct diff_filespec *one,
2225 struct index_state *istate)
77d1a520 2226{
acd00ea0 2227 diff_filespec_load_driver(one, istate);
77d1a520
TR
2228 return one->driver->word_regex;
2229}
2230
2231static void init_diff_words_data(struct emit_callback *ecbdata,
6440d341 2232 struct diff_options *orig_opts,
77d1a520
TR
2233 struct diff_filespec *one,
2234 struct diff_filespec *two)
2235{
2236 int i;
6440d341
TR
2237 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2238 memcpy(o, orig_opts, sizeof(struct diff_options));
77d1a520 2239
ca56dadb 2240 CALLOC_ARRAY(ecbdata->diff_words, 1);
77d1a520
TR
2241 ecbdata->diff_words->type = o->word_diff;
2242 ecbdata->diff_words->opt = o;
e6e045f8
SB
2243
2244 if (orig_opts->emitted_symbols)
ca56dadb 2245 CALLOC_ARRAY(o->emitted_symbols, 1);
e6e045f8 2246
77d1a520 2247 if (!o->word_regex)
acd00ea0 2248 o->word_regex = userdiff_word_regex(one, o->repo->index);
77d1a520 2249 if (!o->word_regex)
acd00ea0 2250 o->word_regex = userdiff_word_regex(two, o->repo->index);
77d1a520
TR
2251 if (!o->word_regex)
2252 o->word_regex = diff_word_regex_cfg;
2253 if (o->word_regex) {
2254 ecbdata->diff_words->word_regex = (regex_t *)
2255 xmalloc(sizeof(regex_t));
2256 if (regcomp(ecbdata->diff_words->word_regex,
2257 o->word_regex,
2258 REG_EXTENDED | REG_NEWLINE))
1a07e59c
NTND
2259 die("invalid regular expression: %s",
2260 o->word_regex);
77d1a520
TR
2261 }
2262 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2263 if (o->word_diff == diff_words_styles[i].type) {
2264 ecbdata->diff_words->style =
2265 &diff_words_styles[i];
2266 break;
2267 }
2268 }
2269 if (want_color(o->use_color)) {
2270 struct diff_words_style *st = ecbdata->diff_words->style;
63a01c3f
BW
2271 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2272 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
8dbf3eb6 2273 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
77d1a520
TR
2274 }
2275}
2276
f59a59e2
JS
2277static void free_diff_words_data(struct emit_callback *ecbdata)
2278{
2279 if (ecbdata->diff_words) {
76fd2828 2280 diff_words_flush(ecbdata);
e6e045f8 2281 free (ecbdata->diff_words->opt->emitted_symbols);
6440d341 2282 free (ecbdata->diff_words->opt);
8e0f7003 2283 free (ecbdata->diff_words->minus.text.ptr);
2e5d2003 2284 free (ecbdata->diff_words->minus.orig);
8e0f7003 2285 free (ecbdata->diff_words->plus.text.ptr);
2e5d2003 2286 free (ecbdata->diff_words->plus.orig);
ef5644ea
BC
2287 if (ecbdata->diff_words->word_regex) {
2288 regfree(ecbdata->diff_words->word_regex);
2289 free(ecbdata->diff_words->word_regex);
2290 }
6a83d902 2291 FREE_AND_NULL(ecbdata->diff_words);
f59a59e2
JS
2292 }
2293}
2294
ce436973 2295const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef 2296{
daa0c3d9 2297 if (want_color(diff_use_color))
50f575fc
LT
2298 return diff_colors[ix];
2299 return "";
cd112cef
JS
2300}
2301
f1922234
JK
2302const char *diff_line_prefix(struct diff_options *opt)
2303{
2304 struct strbuf *msgbuf;
2305 if (!opt->output_prefix)
2306 return "";
2307
2308 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2309 return msgbuf->buf;
2310}
2311
19b9046e 2312static unsigned long sane_truncate_line(char *line, unsigned long len)
23707811
JH
2313{
2314 const char *cp;
2315 unsigned long allot;
2316 size_t l = len;
2317
23707811
JH
2318 cp = line;
2319 allot = l;
2320 while (0 < l) {
2321 (void) utf8_width(&cp, &l);
2322 if (!cp)
2323 break; /* truncated in the middle? */
2324 }
2325 return allot - l;
2326}
2327
d68fe26f 2328static void find_lno(const char *line, struct emit_callback *ecbdata)
690ed843 2329{
d68fe26f
JH
2330 const char *p;
2331 ecbdata->lno_in_preimage = 0;
2332 ecbdata->lno_in_postimage = 0;
2333 p = strchr(line, '-');
690ed843 2334 if (!p)
d68fe26f
JH
2335 return; /* cannot happen */
2336 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2337 p = strchr(p, '+');
2338 if (!p)
2339 return; /* cannot happen */
2340 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
690ed843
JH
2341}
2342
a8d5eb6d 2343static int fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae 2344{
6973dcae 2345 struct emit_callback *ecbdata = priv;
7be57610 2346 struct diff_options *o = ecbdata->opt;
6973dcae 2347
ba16233c
SB
2348 o->found_changes = 1;
2349
3e97c7c6 2350 if (ecbdata->header) {
a29b0a13
SB
2351 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2352 ecbdata->header->buf, ecbdata->header->len, 0);
3e97c7c6
GB
2353 strbuf_reset(ecbdata->header);
2354 ecbdata->header = NULL;
2355 }
34a5e1a2 2356
6973dcae 2357 if (ecbdata->label_path[0]) {
3ee8b7bf
SB
2358 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2359 ecbdata->label_path[0],
2360 strlen(ecbdata->label_path[0]), 0);
2361 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2362 ecbdata->label_path[1],
2363 strlen(ecbdata->label_path[1]), 0);
6973dcae
JH
2364 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2365 }
cd112cef 2366
a624eaa7
JM
2367 if (diff_suppress_blank_empty
2368 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2369 line[0] = '\n';
2370 len = 1;
2371 }
2372
b8d9c1a6 2373 if (line[0] == '@') {
76fd2828
JH
2374 if (ecbdata->diff_words)
2375 diff_words_flush(ecbdata);
19b9046e 2376 len = sane_truncate_line(line, len);
d68fe26f 2377 find_lno(line, ecbdata);
89cb73a1 2378 emit_hunk_header(ecbdata, line, len);
a8d5eb6d 2379 return 0;
cd112cef 2380 }
448c3ef1 2381
448c3ef1 2382 if (ecbdata->diff_words) {
ff958679
SB
2383 enum diff_symbol s =
2384 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2385 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
448c3ef1
JH
2386 if (line[0] == '-') {
2387 diff_words_append(line, len,
2388 &ecbdata->diff_words->minus);
a8d5eb6d 2389 return 0;
448c3ef1
JH
2390 } else if (line[0] == '+') {
2391 diff_words_append(line, len,
2392 &ecbdata->diff_words->plus);
a8d5eb6d 2393 return 0;
59556548 2394 } else if (starts_with(line, "\\ ")) {
c7c2bc0a
TR
2395 /*
2396 * Eat the "no newline at eof" marker as if we
2397 * saw a "+" or "-" line with nothing on it,
2398 * and return without diff_words_flush() to
2399 * defer processing. If this is the end of
2400 * preimage, more "+" lines may come after it.
2401 */
a8d5eb6d 2402 return 0;
448c3ef1 2403 }
76fd2828 2404 diff_words_flush(ecbdata);
ff958679 2405 emit_diff_symbol(o, s, line, len, 0);
a8d5eb6d 2406 return 0;
448c3ef1 2407 }
448c3ef1 2408
0e383e18
JH
2409 switch (line[0]) {
2410 case '+':
d68fe26f 2411 ecbdata->lno_in_postimage++;
e04df612 2412 emit_add_line(ecbdata, line + 1, len - 1);
0e383e18
JH
2413 break;
2414 case '-':
2415 ecbdata->lno_in_preimage++;
e04df612 2416 emit_del_line(ecbdata, line + 1, len - 1);
0e383e18
JH
2417 break;
2418 case ' ':
2419 ecbdata->lno_in_postimage++;
2420 ecbdata->lno_in_preimage++;
e04df612 2421 emit_context_line(ecbdata, line + 1, len - 1);
0e383e18
JH
2422 break;
2423 default:
2424 /* incomplete line at the end */
2425 ecbdata->lno_in_preimage++;
f2bb1218
SB
2426 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2427 line, len, 0);
0e383e18 2428 break;
448c3ef1 2429 }
a8d5eb6d 2430 return 0;
6973dcae
JH
2431}
2432
c905cbc4 2433static void pprint_rename(struct strbuf *name, const char *a, const char *b)
6973dcae 2434{
63a01c3f
BW
2435 const char *old_name = a;
2436 const char *new_name = b;
6973dcae 2437 int pfx_length, sfx_length;
dd281f09 2438 int pfx_adjust_for_slash;
6973dcae
JH
2439 int len_a = strlen(a);
2440 int len_b = strlen(b);
663af342 2441 int a_midlen, b_midlen;
e5bfbf9b
AJ
2442 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2443 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2444
2445 if (qlen_a || qlen_b) {
c905cbc4
NTND
2446 quote_c_style(a, name, NULL, 0);
2447 strbuf_addstr(name, " => ");
2448 quote_c_style(b, name, NULL, 0);
2449 return;
e5bfbf9b 2450 }
6973dcae
JH
2451
2452 /* Find common prefix */
2453 pfx_length = 0;
63a01c3f
BW
2454 while (*old_name && *new_name && *old_name == *new_name) {
2455 if (*old_name == '/')
2456 pfx_length = old_name - a + 1;
2457 old_name++;
2458 new_name++;
6973dcae
JH
2459 }
2460
2461 /* Find common suffix */
63a01c3f
BW
2462 old_name = a + len_a;
2463 new_name = b + len_b;
6973dcae 2464 sfx_length = 0;
d020e27f 2465 /*
dd281f09
TR
2466 * If there is a common prefix, it must end in a slash. In
2467 * that case we let this loop run 1 into the prefix to see the
2468 * same slash.
2469 *
2470 * If there is no common prefix, we cannot do this as it would
2471 * underrun the input strings.
d020e27f 2472 */
dd281f09 2473 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
63a01c3f
BW
2474 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2475 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2476 *old_name == *new_name) {
2477 if (*old_name == '/')
2478 sfx_length = len_a - (old_name - a);
2479 old_name--;
2480 new_name--;
6973dcae
JH
2481 }
2482
2483 /*
2484 * pfx{mid-a => mid-b}sfx
2485 * {pfx-a => pfx-b}sfx
2486 * pfx{sfx-a => sfx-b}
2487 * name-a => name-b
2488 */
663af342
PH
2489 a_midlen = len_a - pfx_length - sfx_length;
2490 b_midlen = len_b - pfx_length - sfx_length;
2491 if (a_midlen < 0)
2492 a_midlen = 0;
2493 if (b_midlen < 0)
2494 b_midlen = 0;
2495
c905cbc4 2496 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 2497 if (pfx_length + sfx_length) {
c905cbc4
NTND
2498 strbuf_add(name, a, pfx_length);
2499 strbuf_addch(name, '{');
6973dcae 2500 }
c905cbc4
NTND
2501 strbuf_add(name, a + pfx_length, a_midlen);
2502 strbuf_addstr(name, " => ");
2503 strbuf_add(name, b + pfx_length, b_midlen);
663af342 2504 if (pfx_length + sfx_length) {
c905cbc4
NTND
2505 strbuf_addch(name, '}');
2506 strbuf_add(name, a + len_a - sfx_length, sfx_length);
6973dcae 2507 }
6973dcae
JH
2508}
2509
6973dcae
JH
2510static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2511 const char *name_a,
2512 const char *name_b)
2513{
2514 struct diffstat_file *x;
ca56dadb 2515 CALLOC_ARRAY(x, 1);
4c960a43 2516 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
6973dcae
JH
2517 diffstat->files[diffstat->nr++] = x;
2518 if (name_b) {
f604652e
JH
2519 x->from_name = xstrdup(name_a);
2520 x->name = xstrdup(name_b);
6973dcae
JH
2521 x->is_renamed = 1;
2522 }
f604652e
JH
2523 else {
2524 x->from_name = NULL;
9befac47 2525 x->name = xstrdup(name_a);
f604652e 2526 }
6973dcae
JH
2527 return x;
2528}
2529
a8d5eb6d 2530static int diffstat_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
2531{
2532 struct diffstat_t *diffstat = priv;
2533 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2534
2535 if (line[0] == '+')
2536 x->added++;
2537 else if (line[0] == '-')
2538 x->deleted++;
a8d5eb6d 2539 return 0;
6973dcae
JH
2540}
2541
698ce6f8 2542const char mime_boundary_leader[] = "------------";
6973dcae 2543
a2540023
JH
2544static int scale_linear(int it, int width, int max_change)
2545{
2eeeef24
JH
2546 if (!it)
2547 return 0;
a2540023 2548 /*
2eeeef24
JH
2549 * make sure that at least one '-' or '+' is printed if
2550 * there is any change to this path. The easiest way is to
15beaaa3 2551 * scale linearly as if the allotted width is one column shorter
2eeeef24 2552 * than it is, and then add 1 to the result.
a2540023 2553 */
2eeeef24 2554 return 1 + (it * (width - 1) / max_change);
a2540023
JH
2555}
2556
0911c475
SB
2557static void show_graph(struct strbuf *out, char ch, int cnt,
2558 const char *set, const char *reset)
a2540023
JH
2559{
2560 if (cnt <= 0)
2561 return;
0911c475
SB
2562 strbuf_addstr(out, set);
2563 strbuf_addchars(out, ch, cnt);
2564 strbuf_addstr(out, reset);
a2540023
JH
2565}
2566
f604652e
JH
2567static void fill_print_name(struct diffstat_file *file)
2568{
c905cbc4 2569 struct strbuf pname = STRBUF_INIT;
f604652e
JH
2570
2571 if (file->print_name)
2572 return;
2573
c905cbc4
NTND
2574 if (file->is_renamed)
2575 pprint_rename(&pname, file->from_name, file->name);
2576 else
2577 quote_c_style(file->name, &pname, NULL, 0);
2578
ddf88fa6
NTND
2579 if (file->comments)
2580 strbuf_addf(&pname, " (%s)", file->comments);
2581
c905cbc4 2582 file->print_name = strbuf_detach(&pname, NULL);
f604652e
JH
2583}
2584
0911c475
SB
2585static void print_stat_summary_inserts_deletes(struct diff_options *options,
2586 int files, int insertions, int deletions)
7f814632
NTND
2587{
2588 struct strbuf sb = STRBUF_INIT;
7f814632
NTND
2589
2590 if (!files) {
2591 assert(insertions == 0 && deletions == 0);
0911c475
SB
2592 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2593 NULL, 0, 0);
2594 return;
7f814632
NTND
2595 }
2596
2597 strbuf_addf(&sb,
218adaaa 2598 (files == 1) ? " %d file changed" : " %d files changed",
7f814632
NTND
2599 files);
2600
2601 /*
2602 * For binary diff, the caller may want to print "x files
2603 * changed" with insertions == 0 && deletions == 0.
2604 *
2605 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2606 * is probably less confusing (i.e skip over "2 files changed
2607 * but nothing about added/removed lines? Is this a bug in Git?").
2608 */
2609 if (insertions || deletions == 0) {
7f814632 2610 strbuf_addf(&sb,
218adaaa 2611 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
7f814632
NTND
2612 insertions);
2613 }
2614
2615 if (deletions || insertions == 0) {
7f814632 2616 strbuf_addf(&sb,
218adaaa 2617 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
7f814632
NTND
2618 deletions);
2619 }
2620 strbuf_addch(&sb, '\n');
0911c475
SB
2621 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2622 sb.buf, sb.len, 0);
7f814632 2623 strbuf_release(&sb);
0911c475
SB
2624}
2625
2626void print_stat_summary(FILE *fp, int files,
2627 int insertions, int deletions)
2628{
2629 struct diff_options o;
2630 memset(&o, 0, sizeof(o));
2631 o.file = fp;
2632
2633 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
7f814632
NTND
2634}
2635
4b25d091 2636static void show_stats(struct diffstat_t *data, struct diff_options *options)
6973dcae 2637{
eb3a9dd3 2638 int i, len, add, del, adds = 0, dels = 0;
0974c117 2639 uintmax_t max_change = 0, max_len = 0;
dc801e71
ZJS
2640 int total_files = data->nr, count;
2641 int width, name_width, graph_width, number_width = 0, bin_width = 0;
c0aa335c 2642 const char *reset, *add_c, *del_c;
e5f85df8 2643 int extra_shown = 0;
0911c475
SB
2644 const char *line_prefix = diff_line_prefix(options);
2645 struct strbuf out = STRBUF_INIT;
6973dcae
JH
2646
2647 if (data->nr == 0)
2648 return;
2649
808e1db2 2650 count = options->stat_count ? options->stat_count : data->nr;
a2540023 2651
8f67f8ae 2652 reset = diff_get_color_opt(options, DIFF_RESET);
8f67f8ae
PH
2653 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2654 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 2655
1b058bc3
ZJS
2656 /*
2657 * Find the longest filename and max number of changes
2658 */
808e1db2 2659 for (i = 0; (i < count) && (i < data->nr); i++) {
6973dcae 2660 struct diffstat_file *file = data->files[i];
0974c117 2661 uintmax_t change = file->added + file->deleted;
af0ed819
JH
2662
2663 if (!file->is_interesting && (change == 0)) {
808e1db2 2664 count++; /* not shown == room for one more */
358e460e
MG
2665 continue;
2666 }
f604652e
JH
2667 fill_print_name(file);
2668 len = strlen(file->print_name);
6973dcae
JH
2669 if (max_len < len)
2670 max_len = len;
2671
dc801e71
ZJS
2672 if (file->is_unmerged) {
2673 /* "Unmerged" is 8 characters */
2674 bin_width = bin_width < 8 ? 8 : bin_width;
6973dcae 2675 continue;
dc801e71
ZJS
2676 }
2677 if (file->is_binary) {
2678 /* "Bin XXX -> YYY bytes" */
2679 int w = 14 + decimal_width(file->added)
2680 + decimal_width(file->deleted);
2681 bin_width = bin_width < w ? w : bin_width;
2682 /* Display change counts aligned with "Bin" */
2683 number_width = 3;
2684 continue;
2685 }
2686
a2540023
JH
2687 if (max_change < change)
2688 max_change = change;
6973dcae 2689 }
a20d3c0d 2690 count = i; /* where we can stop scanning in data->files[] */
6973dcae 2691
1b058bc3
ZJS
2692 /*
2693 * We have width = stat_width or term_columns() columns total.
2694 * We want a maximum of min(max_len, stat_name_width) for the name part.
969fe57b 2695 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1b058bc3
ZJS
2696 * We also need 1 for " " and 4 + decimal_width(max_change)
2697 * for " | NNNN " and one the empty column at the end, altogether
2698 * 6 + decimal_width(max_change).
2699 *
2700 * If there's not enough space, we will use the smaller of
2701 * stat_name_width (if set) and 5/8*width for the filename,
969fe57b
ZJS
2702 * and the rest for constant elements + graph part, but no more
2703 * than stat_graph_width for the graph part.
1b058bc3
ZJS
2704 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2705 * for the standard terminal size).
a2540023 2706 *
1b058bc3
ZJS
2707 * In other words: stat_width limits the maximum width, and
2708 * stat_name_width fixes the maximum width of the filename,
2709 * and is also used to divide available columns if there
2710 * aren't enough.
dc801e71
ZJS
2711 *
2712 * Binary files are displayed with "Bin XXX -> YYY bytes"
2713 * instead of the change count and graph. This part is treated
2714 * similarly to the graph part, except that it is not
41ccfdd9 2715 * "scaled". If total width is too small to accommodate the
dc801e71
ZJS
2716 * guaranteed minimum width of the filename part and the
2717 * separators and this message, this message will "overflow"
2718 * making the line longer than the maximum width.
a2540023 2719 */
1b058bc3
ZJS
2720
2721 if (options->stat_width == -1)
cd48dadb 2722 width = term_columns() - strlen(line_prefix);
a2540023 2723 else
1b058bc3 2724 width = options->stat_width ? options->stat_width : 80;
dc801e71
ZJS
2725 number_width = decimal_width(max_change) > number_width ?
2726 decimal_width(max_change) : number_width;
a2540023 2727
df44483a
ZJS
2728 if (options->stat_graph_width == -1)
2729 options->stat_graph_width = diff_stat_graph_width;
a2540023 2730
1b058bc3
ZJS
2731 /*
2732 * Guarantee 3/8*16==6 for the graph part
2733 * and 5/8*16==10 for the filename part
2734 */
2735 if (width < 16 + 6 + number_width)
2736 width = 16 + 6 + number_width;
2737
2738 /*
2739 * First assign sizes that are wanted, ignoring available width.
dc801e71
ZJS
2740 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2741 * starting from "XXX" should fit in graph_width.
1b058bc3 2742 */
dc801e71
ZJS
2743 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2744 if (options->stat_graph_width &&
2745 options->stat_graph_width < graph_width)
2746 graph_width = options->stat_graph_width;
2747
1b058bc3
ZJS
2748 name_width = (options->stat_name_width > 0 &&
2749 options->stat_name_width < max_len) ?
2750 options->stat_name_width : max_len;
2751
2752 /*
2753 * Adjust adjustable widths not to exceed maximum width
2754 */
2755 if (name_width + number_width + 6 + graph_width > width) {
678c5741 2756 if (graph_width > width * 3/8 - number_width - 6) {
1b058bc3 2757 graph_width = width * 3/8 - number_width - 6;
678c5741
LP
2758 if (graph_width < 6)
2759 graph_width = 6;
2760 }
2761
969fe57b
ZJS
2762 if (options->stat_graph_width &&
2763 graph_width > options->stat_graph_width)
2764 graph_width = options->stat_graph_width;
1b058bc3
ZJS
2765 if (name_width > width - number_width - 6 - graph_width)
2766 name_width = width - number_width - 6 - graph_width;
2767 else
2768 graph_width = width - number_width - 6 - name_width;
2769 }
2770
2771 /*
2772 * From here name_width is the width of the name area,
2773 * and graph_width is the width of the graph area.
2774 * max_change is used to scale graph properly.
2775 */
808e1db2 2776 for (i = 0; i < count; i++) {
d2543b8e 2777 const char *prefix = "";
af0ed819
JH
2778 struct diffstat_file *file = data->files[i];
2779 char *name = file->print_name;
2780 uintmax_t added = file->added;
2781 uintmax_t deleted = file->deleted;
a2540023 2782 int name_len;
6973dcae 2783
a20d3c0d 2784 if (!file->is_interesting && (added + deleted == 0))
358e460e 2785 continue;
a20d3c0d 2786
6973dcae
JH
2787 /*
2788 * "scale" the filename
2789 */
a2540023
JH
2790 len = name_width;
2791 name_len = strlen(name);
2792 if (name_width < name_len) {
6973dcae
JH
2793 char *slash;
2794 prefix = "...";
a2540023
JH
2795 len -= 3;
2796 name += name_len - len;
6973dcae
JH
2797 slash = strchr(name, '/');
2798 if (slash)
2799 name = slash;
2800 }
6973dcae 2801
af0ed819 2802 if (file->is_binary) {
0911c475
SB
2803 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2804 strbuf_addf(&out, " %*s", number_width, "Bin");
e18872b2 2805 if (!added && !deleted) {
0911c475
SB
2806 strbuf_addch(&out, '\n');
2807 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2808 out.buf, out.len, 0);
2809 strbuf_reset(&out);
e18872b2
ZJS
2810 continue;
2811 }
0911c475 2812 strbuf_addf(&out, " %s%"PRIuMAX"%s",
0974c117 2813 del_c, deleted, reset);
0911c475
SB
2814 strbuf_addstr(&out, " -> ");
2815 strbuf_addf(&out, "%s%"PRIuMAX"%s",
0974c117 2816 add_c, added, reset);
0911c475
SB
2817 strbuf_addstr(&out, " bytes\n");
2818 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2819 out.buf, out.len, 0);
2820 strbuf_reset(&out);
f604652e 2821 continue;
6973dcae 2822 }
af0ed819 2823 else if (file->is_unmerged) {
0911c475
SB
2824 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2825 strbuf_addstr(&out, " Unmerged\n");
2826 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2827 out.buf, out.len, 0);
2828 strbuf_reset(&out);
f604652e 2829 continue;
6973dcae 2830 }
6973dcae 2831
a2540023
JH
2832 /*
2833 * scale the add/delete
2834 */
6973dcae
JH
2835 add = added;
2836 del = deleted;
6973dcae 2837
1b058bc3 2838 if (graph_width <= max_change) {
d3c9cf32 2839 int total = scale_linear(add + del, graph_width, max_change);
2eeeef24
JH
2840 if (total < 2 && add && del)
2841 /* width >= 2 due to the sanity check */
2842 total = 2;
2843 if (add < del) {
1b058bc3 2844 add = scale_linear(add, graph_width, max_change);
2eeeef24
JH
2845 del = total - add;
2846 } else {
1b058bc3 2847 del = scale_linear(del, graph_width, max_change);
2eeeef24
JH
2848 add = total - del;
2849 }
6973dcae 2850 }
0911c475
SB
2851 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2852 strbuf_addf(&out, " %*"PRIuMAX"%s",
dc801e71
ZJS
2853 number_width, added + deleted,
2854 added + deleted ? " " : "");
0911c475
SB
2855 show_graph(&out, '+', add, add_c, reset);
2856 show_graph(&out, '-', del, del_c, reset);
2857 strbuf_addch(&out, '\n');
2858 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2859 out.buf, out.len, 0);
2860 strbuf_reset(&out);
c0c77734 2861 }
a20d3c0d
JH
2862
2863 for (i = 0; i < data->nr; i++) {
af0ed819
JH
2864 struct diffstat_file *file = data->files[i];
2865 uintmax_t added = file->added;
2866 uintmax_t deleted = file->deleted;
82dfc2c4
JH
2867
2868 if (file->is_unmerged ||
2869 (!file->is_interesting && (added + deleted == 0))) {
808e1db2
MG
2870 total_files--;
2871 continue;
2872 }
a20d3c0d 2873
82dfc2c4 2874 if (!file->is_binary) {
a20d3c0d
JH
2875 adds += added;
2876 dels += deleted;
2877 }
2878 if (i < count)
2879 continue;
e5f85df8 2880 if (!extra_shown)
0911c475
SB
2881 emit_diff_symbol(options,
2882 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2883 NULL, 0, 0);
e5f85df8 2884 extra_shown = 1;
808e1db2 2885 }
0911c475
SB
2886
2887 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
5a612017 2888 strbuf_release(&out);
6973dcae
JH
2889}
2890
2775d92c 2891static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
ebd124c6
NP
2892{
2893 int i, adds = 0, dels = 0, total_files = data->nr;
2894
2895 if (data->nr == 0)
2896 return;
2897
2898 for (i = 0; i < data->nr; i++) {
e18872b2 2899 int added = data->files[i]->added;
0911c475 2900 int deleted = data->files[i]->deleted;
e18872b2 2901
20c8cde4
JH
2902 if (data->files[i]->is_unmerged ||
2903 (!data->files[i]->is_interesting && (added + deleted == 0))) {
e18872b2 2904 total_files--;
de9658b5 2905 } else if (!data->files[i]->is_binary) { /* don't count bytes */
e18872b2
ZJS
2906 adds += added;
2907 dels += deleted;
ebd124c6 2908 }
ebd124c6 2909 }
0911c475 2910 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
ebd124c6
NP
2911}
2912
4b25d091 2913static void show_numstat(struct diffstat_t *data, struct diff_options *options)
74e2abe5
JH
2914{
2915 int i;
2916
f604652e
JH
2917 if (data->nr == 0)
2918 return;
2919
74e2abe5
JH
2920 for (i = 0; i < data->nr; i++) {
2921 struct diffstat_file *file = data->files[i];
2922
30997bb8 2923 fprintf(options->file, "%s", diff_line_prefix(options));
7be57610 2924
bfddbc5e 2925 if (file->is_binary)
c0c77734 2926 fprintf(options->file, "-\t-\t");
bfddbc5e 2927 else
c0c77734 2928 fprintf(options->file,
0974c117
JK
2929 "%"PRIuMAX"\t%"PRIuMAX"\t",
2930 file->added, file->deleted);
f604652e
JH
2931 if (options->line_termination) {
2932 fill_print_name(file);
2933 if (!file->is_renamed)
c0c77734 2934 write_name_quoted(file->name, options->file,
f604652e
JH
2935 options->line_termination);
2936 else {
c0c77734
DB
2937 fputs(file->print_name, options->file);
2938 putc(options->line_termination, options->file);
f604652e 2939 }
663af342 2940 } else {
f604652e 2941 if (file->is_renamed) {
c0c77734
DB
2942 putc('\0', options->file);
2943 write_name_quoted(file->from_name, options->file, '\0');
f604652e 2944 }
c0c77734 2945 write_name_quoted(file->name, options->file, '\0');
663af342 2946 }
74e2abe5
JH
2947 }
2948}
2949
c04a7155
JH
2950struct dirstat_file {
2951 const char *name;
2952 unsigned long changed;
7df7c019
LT
2953};
2954
c04a7155
JH
2955struct dirstat_dir {
2956 struct dirstat_file *files;
712d2c7d 2957 int alloc, nr, permille, cumulative;
c04a7155
JH
2958};
2959
7be57610
BY
2960static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2961 unsigned long changed, const char *base, int baselen)
7df7c019 2962{
585c0e2e 2963 unsigned long sum_changes = 0;
7df7c019 2964 unsigned int sources = 0;
30997bb8 2965 const char *line_prefix = diff_line_prefix(opt);
7df7c019
LT
2966
2967 while (dir->nr) {
c04a7155 2968 struct dirstat_file *f = dir->files;
7df7c019 2969 int namelen = strlen(f->name);
585c0e2e 2970 unsigned long changes;
7df7c019
LT
2971 char *slash;
2972
2973 if (namelen < baselen)
2974 break;
2975 if (memcmp(f->name, base, baselen))
2976 break;
2977 slash = strchr(f->name + baselen, '/');
2978 if (slash) {
2979 int newbaselen = slash + 1 - f->name;
585c0e2e 2980 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
7df7c019
LT
2981 sources++;
2982 } else {
585c0e2e 2983 changes = f->changed;
7df7c019
LT
2984 dir->files++;
2985 dir->nr--;
2986 sources += 2;
2987 }
585c0e2e 2988 sum_changes += changes;
7df7c019
LT
2989 }
2990
2991 /*
2992 * We don't report dirstat's for
2993 * - the top level
2994 * - or cases where everything came from a single directory
2995 * under this directory (sources == 1).
2996 */
2997 if (baselen && sources != 1) {
585c0e2e
BW
2998 if (sum_changes) {
2999 int permille = sum_changes * 1000 / changed;
712d2c7d 3000 if (permille >= dir->permille) {
7be57610 3001 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
712d2c7d 3002 permille / 10, permille % 10, baselen, base);
7df7c019
LT
3003 if (!dir->cumulative)
3004 return 0;
3005 }
3006 }
3007 }
585c0e2e 3008 return sum_changes;
7df7c019
LT
3009}
3010
441bca0b
LT
3011static int dirstat_compare(const void *_a, const void *_b)
3012{
3013 const struct dirstat_file *a = _a;
3014 const struct dirstat_file *b = _b;
3015 return strcmp(a->name, b->name);
3016}
3017
c04a7155 3018static void show_dirstat(struct diff_options *options)
7df7c019
LT
3019{
3020 int i;
3021 unsigned long changed;
c04a7155
JH
3022 struct dirstat_dir dir;
3023 struct diff_queue_struct *q = &diff_queued_diff;
3024
3025 dir.files = NULL;
3026 dir.alloc = 0;
3027 dir.nr = 0;
712d2c7d 3028 dir.permille = options->dirstat_permille;
0d1e0e78 3029 dir.cumulative = options->flags.dirstat_cumulative;
7df7c019 3030
7df7c019 3031 changed = 0;
c04a7155
JH
3032 for (i = 0; i < q->nr; i++) {
3033 struct diff_filepair *p = q->queue[i];
3034 const char *name;
3035 unsigned long copied, added, damage;
1c37e86a
JT
3036 struct diff_populate_filespec_options dpf_options = {
3037 .check_size_only = 1,
3038 };
c04a7155 3039
2ca86714 3040 name = p->two->path ? p->two->path : p->one->path;
c04a7155 3041
d9f62dfa
JK
3042 if (p->one->oid_valid && p->two->oid_valid &&
3043 oideq(&p->one->oid, &p->two->oid)) {
2ff3a803
JH
3044 /*
3045 * The SHA1 has not changed, so pre-/post-content is
3046 * identical. We can therefore skip looking at the
3047 * file contents altogether.
3048 */
3049 damage = 0;
3050 goto found_damage;
3051 }
3052
0d1e0e78 3053 if (options->flags.dirstat_by_file) {
0133dab7
JH
3054 /*
3055 * In --dirstat-by-file mode, we don't really need to
3056 * look at the actual file contents at all.
3057 * The fact that the SHA1 changed is enough for us to
3058 * add this file to the list of results
3059 * (with each file contributing equal damage).
3060 */
2ff3a803 3061 damage = 1;
0133dab7
JH
3062 goto found_damage;
3063 }
c04a7155
JH
3064
3065 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1c37e86a
JT
3066 diff_populate_filespec(options->repo, p->one, NULL);
3067 diff_populate_filespec(options->repo, p->two, NULL);
b78ea5fc
NTND
3068 diffcore_count_changes(options->repo,
3069 p->one, p->two, NULL, NULL,
c04a7155
JH
3070 &copied, &added);
3071 diff_free_filespec_data(p->one);
3072 diff_free_filespec_data(p->two);
3073 } else if (DIFF_FILE_VALID(p->one)) {
1c37e86a 3074 diff_populate_filespec(options->repo, p->one, &dpf_options);
c04a7155
JH
3075 copied = added = 0;
3076 diff_free_filespec_data(p->one);
3077 } else if (DIFF_FILE_VALID(p->two)) {
1c37e86a 3078 diff_populate_filespec(options->repo, p->two, &dpf_options);
c04a7155
JH
3079 copied = 0;
3080 added = p->two->size;
3081 diff_free_filespec_data(p->two);
3082 } else
2b0b551d 3083 continue;
c04a7155
JH
3084
3085 /*
3086 * Original minus copied is the removed material,
3087 * added is the new material. They are both damages
0133dab7 3088 * made to the preimage.
2ff3a803
JH
3089 * If the resulting damage is zero, we know that
3090 * diffcore_count_changes() considers the two entries to
d9f62dfa 3091 * be identical, but since the oid changed, we
2ff3a803
JH
3092 * know that there must have been _some_ kind of change,
3093 * so we force all entries to have damage > 0.
c04a7155
JH
3094 */
3095 damage = (p->one->size - copied) + added;
2ff3a803 3096 if (!damage)
fd33777b 3097 damage = 1;
c04a7155 3098
0133dab7 3099found_damage:
c04a7155
JH
3100 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3101 dir.files[dir.nr].name = name;
3102 dir.files[dir.nr].changed = damage;
3103 changed += damage;
3104 dir.nr++;
7df7c019
LT
3105 }
3106
3107 /* This can happen even with many files, if everything was renames */
3108 if (!changed)
3109 return;
3110
3111 /* Show all directories with more than x% of the changes */
9ed0d8d6 3112 QSORT(dir.files, dir.nr, dirstat_compare);
7be57610 3113 gather_dirstat(options, &dir, changed, "", 0);
7df7c019
LT
3114}
3115
1c57a627
JH
3116static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3117{
3118 int i;
3119 unsigned long changed;
3120 struct dirstat_dir dir;
3121
3122 if (data->nr == 0)
3123 return;
3124
3125 dir.files = NULL;
3126 dir.alloc = 0;
3127 dir.nr = 0;
3128 dir.permille = options->dirstat_permille;
0d1e0e78 3129 dir.cumulative = options->flags.dirstat_cumulative;
1c57a627
JH
3130
3131 changed = 0;
3132 for (i = 0; i < data->nr; i++) {
3133 struct diffstat_file *file = data->files[i];
3134 unsigned long damage = file->added + file->deleted;
3135 if (file->is_binary)
3136 /*
3137 * binary files counts bytes, not lines. Must find some
3138 * way to normalize binary bytes vs. textual lines.
3139 * The following heuristic assumes that there are 64
3140 * bytes per "line".
3141 * This is stupid and ugly, but very cheap...
3142 */
42c78a21 3143 damage = DIV_ROUND_UP(damage, 64);
1c57a627
JH
3144 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3145 dir.files[dir.nr].name = file->name;
3146 dir.files[dir.nr].changed = damage;
3147 changed += damage;
3148 dir.nr++;
3149 }
3150
3151 /* This can happen even with many files, if everything was renames */
3152 if (!changed)
3153 return;
3154
3155 /* Show all directories with more than x% of the changes */
9ed0d8d6 3156 QSORT(dir.files, dir.nr, dirstat_compare);
1c57a627
JH
3157 gather_dirstat(options, &dir, changed, "", 0);
3158}
3159
1cf3d5db
MR
3160static void free_diffstat_file(struct diffstat_file *f)
3161{
3162 free(f->print_name);
3163 free(f->name);
3164 free(f->from_name);
3165 free(f);
3166}
3167
e4cb659e 3168void free_diffstat_info(struct diffstat_t *diffstat)
f604652e
JH
3169{
3170 int i;
1cf3d5db
MR
3171 for (i = 0; i < diffstat->nr; i++)
3172 free_diffstat_file(diffstat->files[i]);
f604652e
JH
3173 free(diffstat->files);
3174}
3175
88246898 3176struct checkdiff_t {
88246898 3177 const char *filename;
1ba111d1 3178 int lineno;
a757c646 3179 int conflict_marker_size;
1ba111d1 3180 struct diff_options *o;
cf1b7869 3181 unsigned ws_rule;
62c64895 3182 unsigned status;
88246898
JS
3183};
3184
a757c646 3185static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
04954043
JH
3186{
3187 char firstchar;
3188 int cnt;
3189
a757c646 3190 if (len < marker_size + 1)
04954043
JH
3191 return 0;
3192 firstchar = line[0];
3193 switch (firstchar) {
a757c646 3194 case '=': case '>': case '<': case '|':
04954043
JH
3195 break;
3196 default:
3197 return 0;
3198 }
a757c646 3199 for (cnt = 1; cnt < marker_size; cnt++)
04954043
JH
3200 if (line[cnt] != firstchar)
3201 return 0;
15beaaa3 3202 /* line[1] through line[marker_size-1] are same as firstchar */
a757c646 3203 if (len < marker_size + 1 || !isspace(line[marker_size]))
04954043 3204 return 0;
04954043
JH
3205 return 1;
3206}
3207
75ab7630
JK
3208static void checkdiff_consume_hunk(void *priv,
3209 long ob, long on, long nb, long nn,
3210 const char *func, long funclen)
3211
3212{
3213 struct checkdiff_t *data = priv;
3214 data->lineno = nb - 1;
3215}
3216
a8d5eb6d 3217static int checkdiff_consume(void *priv, char *line, unsigned long len)
88246898
JS
3218{
3219 struct checkdiff_t *data = priv;
a757c646 3220 int marker_size = data->conflict_marker_size;
f1c96261
JK
3221 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3222 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3223 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
c1795bb0 3224 char *err;
30997bb8 3225 const char *line_prefix;
7be57610
BY
3226
3227 assert(data->o);
30997bb8 3228 line_prefix = diff_line_prefix(data->o);
88246898
JS
3229
3230 if (line[0] == '+') {
18374e58 3231 unsigned bad;
0ef617f4 3232 data->lineno++;
a757c646 3233 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
04954043
JH
3234 data->status |= 1;
3235 fprintf(data->o->file,
7be57610
BY
3236 "%s%s:%d: leftover conflict marker\n",
3237 line_prefix, data->filename, data->lineno);
04954043 3238 }
8f8841e9 3239 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 3240 if (!bad)
a8d5eb6d 3241 return 0;
18374e58
JH
3242 data->status |= bad;
3243 err = whitespace_error_string(bad);
7be57610
BY
3244 fprintf(data->o->file, "%s%s:%d: %s.\n",
3245 line_prefix, data->filename, data->lineno, err);
c1795bb0 3246 free(err);
a3c158d4 3247 emit_line(data->o, set, reset, line, 1);
8f8841e9 3248 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 3249 data->o->file, set, reset, ws);
877f23cc 3250 } else if (line[0] == ' ') {
88246898 3251 data->lineno++;
88246898 3252 }
a8d5eb6d 3253 return 0;
88246898
JS
3254}
3255
0660626c
JH
3256static unsigned char *deflate_it(char *data,
3257 unsigned long size,
3258 unsigned long *result_size)
051308f6 3259{
0660626c
JH
3260 int bound;
3261 unsigned char *deflated;
ef49a7a0 3262 git_zstream stream;
0660626c 3263
55bb5c91 3264 git_deflate_init(&stream, zlib_compression_level);
225a6f10 3265 bound = git_deflate_bound(&stream, size);
0660626c
JH
3266 deflated = xmalloc(bound);
3267 stream.next_out = deflated;
3268 stream.avail_out = bound;
3269
3270 stream.next_in = (unsigned char *)data;
3271 stream.avail_in = size;
55bb5c91 3272 while (git_deflate(&stream, Z_FINISH) == Z_OK)
0660626c 3273 ; /* nothing */
55bb5c91 3274 git_deflate_end(&stream);
0660626c
JH
3275 *result_size = stream.total_out;
3276 return deflated;
051308f6
JH
3277}
3278
4eed0ebd
SB
3279static void emit_binary_diff_body(struct diff_options *o,
3280 mmfile_t *one, mmfile_t *two)
051308f6 3281{
0660626c
JH
3282 void *cp;
3283 void *delta;
3284 void *deflated;
3285 void *data;
3286 unsigned long orig_size;
3287 unsigned long delta_size;
3288 unsigned long deflate_size;
3289 unsigned long data_size;
051308f6 3290
0660626c
JH
3291 /* We could do deflated delta, or we could do just deflated two,
3292 * whichever is smaller.
051308f6 3293 */
0660626c
JH
3294 delta = NULL;
3295 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3296 if (one->size && two->size) {
3297 delta = diff_delta(one->ptr, one->size,
3298 two->ptr, two->size,
3299 &delta_size, deflate_size);
3300 if (delta) {
3301 void *to_free = delta;
3302 orig_size = delta_size;
3303 delta = deflate_it(delta, delta_size, &delta_size);
3304 free(to_free);
051308f6
JH
3305 }
3306 }
051308f6 3307
0660626c 3308 if (delta && delta_size < deflate_size) {
ca473cef 3309 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
4eed0ebd
SB
3310 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3311 s, strlen(s), 0);
3312 free(s);
0660626c
JH
3313 free(deflated);
3314 data = delta;
3315 data_size = delta_size;
4eed0ebd
SB
3316 } else {
3317 char *s = xstrfmt("%lu", two->size);
3318 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3319 s, strlen(s), 0);
3320 free(s);
0660626c
JH
3321 free(delta);
3322 data = deflated;
3323 data_size = deflate_size;
3324 }
051308f6 3325
0660626c
JH
3326 /* emit data encoded in base85 */
3327 cp = data;
3328 while (data_size) {
4eed0ebd 3329 int len;
0660626c 3330 int bytes = (52 < data_size) ? 52 : data_size;
4eed0ebd 3331 char line[71];
0660626c 3332 data_size -= bytes;
051308f6
JH
3333 if (bytes <= 26)
3334 line[0] = bytes + 'A' - 1;
3335 else
3336 line[0] = bytes - 26 + 'a' - 1;
3337 encode_85(line + 1, cp, bytes);
1d7f171c 3338 cp = (char *) cp + bytes;
4eed0ebd
SB
3339
3340 len = strlen(line);
3341 line[len++] = '\n';
3342 line[len] = '\0';
3343
3344 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3345 line, len, 0);
051308f6 3346 }
4eed0ebd 3347 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
0660626c 3348 free(data);
051308f6
JH
3349}
3350
4eed0ebd
SB
3351static void emit_binary_diff(struct diff_options *o,
3352 mmfile_t *one, mmfile_t *two)
d4c452f0 3353{
4eed0ebd
SB
3354 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3355 emit_binary_diff_body(o, one, two);
3356 emit_binary_diff_body(o, two, one);
d4c452f0
JH
3357}
3358
b78ea5fc
NTND
3359int diff_filespec_is_binary(struct repository *r,
3360 struct diff_filespec *one)
29a3eefd 3361{
1c37e86a
JT
3362 struct diff_populate_filespec_options dpf_options = {
3363 .check_binary = 1,
3364 };
3365
122aa6f9 3366 if (one->is_binary == -1) {
acd00ea0 3367 diff_filespec_load_driver(one, r->index);
122aa6f9
JK
3368 if (one->driver->binary != -1)
3369 one->is_binary = one->driver->binary;
3370 else {
3371 if (!one->data && DIFF_FILE_VALID(one))
1c37e86a 3372 diff_populate_filespec(r, one, &dpf_options);
6bf3b813 3373 if (one->is_binary == -1 && one->data)
122aa6f9
JK
3374 one->is_binary = buffer_is_binary(one->data,
3375 one->size);
3376 if (one->is_binary == -1)
3377 one->is_binary = 0;
3378 }
3379 }
29a3eefd 3380 return one->is_binary;
6973dcae
JH
3381}
3382
acd00ea0
NTND
3383static const struct userdiff_funcname *
3384diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
f258475a 3385{
acd00ea0 3386 diff_filespec_load_driver(one, o->repo->index);
122aa6f9 3387 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
f258475a
JH
3388}
3389
a5a818ee
JH
3390void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3391{
3392 if (!options->a_prefix)
3393 options->a_prefix = a;
3394 if (!options->b_prefix)
3395 options->b_prefix = b;
3396}
3397
bd7ad45b 3398struct userdiff_driver *get_textconv(struct repository *r,
acd00ea0 3399 struct diff_filespec *one)
04427ac8
JK
3400{
3401 if (!DIFF_FILE_VALID(one))
3402 return NULL;
d391c0ff 3403
bd7ad45b
NTND
3404 diff_filespec_load_driver(one, r->index);
3405 return userdiff_get_textconv(r, one->driver);
04427ac8
JK
3406}
3407
6973dcae
JH
3408static void builtin_diff(const char *name_a,
3409 const char *name_b,
3410 struct diff_filespec *one,
3411 struct diff_filespec *two,
3412 const char *xfrm_msg,
296c6bb2 3413 int must_show_header,
051308f6 3414 struct diff_options *o,
6973dcae
JH
3415 int complete_rewrite)
3416{
3417 mmfile_t mf1, mf2;
3418 const char *lbl[2];
3419 char *a_one, *b_two;
d9c552f1 3420 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
8f67f8ae 3421 const char *reset = diff_get_color_opt(o, DIFF_RESET);
a5a818ee 3422 const char *a_prefix, *b_prefix;
d9bae1a1
JK
3423 struct userdiff_driver *textconv_one = NULL;
3424 struct userdiff_driver *textconv_two = NULL;
3e97c7c6 3425 struct strbuf header = STRBUF_INIT;
30997bb8 3426 const char *line_prefix = diff_line_prefix(o);
a5a818ee 3427
fd47ae6a 3428 diff_set_mnemonic_prefix(o, "a/", "b/");
0d1e0e78 3429 if (o->flags.reverse_diff) {
fd47ae6a
JK
3430 a_prefix = o->b_prefix;
3431 b_prefix = o->a_prefix;
3432 } else {
3433 a_prefix = o->a_prefix;
3434 b_prefix = o->b_prefix;
3435 }
3436
61cfbc05
JK
3437 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3438 (!one->mode || S_ISGITLINK(one->mode)) &&
3439 (!two->mode || S_ISGITLINK(two->mode))) {
180b154b 3440 show_submodule_diff_summary(o, one->path ? one->path : two->path,
602a283a 3441 &one->oid, &two->oid,
f3597138 3442 two->dirty_submodule);
752c0c24 3443 return;
fd47ae6a
JK
3444 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3445 (!one->mode || S_ISGITLINK(one->mode)) &&
3446 (!two->mode || S_ISGITLINK(two->mode))) {
f3597138 3447 show_submodule_inline_diff(o, one->path ? one->path : two->path,
fd47ae6a 3448 &one->oid, &two->oid,
f3597138 3449 two->dirty_submodule);
fd47ae6a 3450 return;
752c0c24
JS
3451 }
3452
0d1e0e78 3453 if (o->flags.allow_textconv) {
bd7ad45b
NTND
3454 textconv_one = get_textconv(o->repo, one);
3455 textconv_two = get_textconv(o->repo, two);
3aa1f7ca
JK
3456 }
3457
71b989e7
LT
3458 /* Never use a non-valid filename anywhere if at all possible */
3459 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3460 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3461
a5a818ee
JH
3462 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3463 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
3464 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3465 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
d9c552f1 3466 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
6973dcae
JH
3467 if (lbl[0][0] == '/') {
3468 /* /dev/null */
d9c552f1 3469 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
37466447
BW
3470 if (xfrm_msg)
3471 strbuf_addstr(&header, xfrm_msg);
296c6bb2 3472 must_show_header = 1;
6973dcae
JH
3473 }
3474 else if (lbl[1][0] == '/') {
d9c552f1 3475 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
37466447
BW
3476 if (xfrm_msg)
3477 strbuf_addstr(&header, xfrm_msg);
296c6bb2 3478 must_show_header = 1;
6973dcae
JH
3479 }
3480 else {
3481 if (one->mode != two->mode) {
d9c552f1
JK
3482 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3483 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
296c6bb2 3484 must_show_header = 1;
cd112cef 3485 }
37466447
BW
3486 if (xfrm_msg)
3487 strbuf_addstr(&header, xfrm_msg);
3e97c7c6 3488
6973dcae
JH
3489 /*
3490 * we do not run diff between different kind
3491 * of objects.
3492 */
3493 if ((one->mode ^ two->mode) & S_IFMT)
3494 goto free_ab_and_return;
0c01857d 3495 if (complete_rewrite &&
b78ea5fc
NTND
3496 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3497 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
a29b0a13
SB
3498 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3499 header.buf, header.len, 0);
3e97c7c6 3500 strbuf_reset(&header);
3aa1f7ca 3501 emit_rewrite_diff(name_a, name_b, one, two,
b78ea5fc 3502 textconv_one, textconv_two, o);
34a5e1a2 3503 o->found_changes = 1;
6973dcae
JH
3504 goto free_ab_and_return;
3505 }
3506 }
3507
467ddc14 3508 if (o->irreversible_delete && lbl[1][0] == '/') {
a29b0a13
SB
3509 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3510 header.len, 0);
467ddc14
JH
3511 strbuf_reset(&header);
3512 goto free_ab_and_return;
0d1e0e78 3513 } else if (!o->flags.text &&
b78ea5fc
NTND
3514 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3515 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
4acaaa7a 3516 struct strbuf sb = STRBUF_INIT;
1aaf69e6
NTND
3517 if (!one->data && !two->data &&
3518 S_ISREG(one->mode) && S_ISREG(two->mode) &&
0d1e0e78 3519 !o->flags.binary) {
4a7e27e9 3520 if (oideq(&one->oid, &two->oid)) {
1aaf69e6 3521 if (must_show_header)
a29b0a13
SB
3522 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3523 header.buf, header.len,
3524 0);
1aaf69e6
NTND
3525 goto free_ab_and_return;
3526 }
a29b0a13
SB
3527 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3528 header.buf, header.len, 0);
4acaaa7a
SB
3529 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3530 diff_line_prefix(o), lbl[0], lbl[1]);
3531 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3532 sb.buf, sb.len, 0);
3533 strbuf_release(&sb);
1aaf69e6
NTND
3534 goto free_ab_and_return;
3535 }
b78ea5fc
NTND
3536 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3537 fill_mmfile(o->repo, &mf2, two) < 0)
b3373982 3538 die("unable to read files to diff");
0660626c
JH
3539 /* Quite common confusing case */
3540 if (mf1.size == mf2.size &&
296c6bb2
CC
3541 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3542 if (must_show_header)
a29b0a13
SB
3543 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3544 header.buf, header.len, 0);
0660626c 3545 goto free_ab_and_return;
296c6bb2 3546 }
a29b0a13 3547 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3e97c7c6 3548 strbuf_reset(&header);
0d1e0e78 3549 if (o->flags.binary)
4eed0ebd 3550 emit_binary_diff(o, &mf1, &mf2);
4acaaa7a
SB
3551 else {
3552 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3553 diff_line_prefix(o), lbl[0], lbl[1]);
3554 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3555 sb.buf, sb.len, 0);
3556 strbuf_release(&sb);
3557 }
34a5e1a2 3558 o->found_changes = 1;
467ddc14 3559 } else {
6973dcae 3560 /* Crazy xdl interfaces.. */
0da0e926 3561 const char *diffopts;
ae021d87 3562 const char *v;
6973dcae
JH
3563 xpparam_t xpp;
3564 xdemitconf_t xecfg;
6973dcae 3565 struct emit_callback ecbdata;
be58e70d 3566 const struct userdiff_funcname *pe;
f258475a 3567
b3f01ff2 3568 if (must_show_header) {
a29b0a13
SB
3569 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3570 header.buf, header.len, 0);
3e97c7c6
GB
3571 strbuf_reset(&header);
3572 }
3573
6afaf807
NTND
3574 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3575 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
04427ac8 3576
acd00ea0 3577 pe = diff_funcname_pattern(o, one);
45e7ca0f 3578 if (!pe)
acd00ea0 3579 pe = diff_funcname_pattern(o, two);
6973dcae 3580
9ccd0a88 3581 memset(&xpp, 0, sizeof(xpp));
30b25010 3582 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 3583 memset(&ecbdata, 0, sizeof(ecbdata));
1cdde296
JS
3584 if (o->flags.suppress_diff_headers)
3585 lbl[0] = NULL;
6973dcae 3586 ecbdata.label_path = lbl;
daa0c3d9 3587 ecbdata.color_diff = want_color(o->use_color);
26d024ec 3588 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
690ed843 3589 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
d68fe26f 3590 check_blank_at_eof(&mf1, &mf2, &ecbdata);
a3c158d4 3591 ecbdata.opt = o;
1cdde296
JS
3592 if (header.len && !o->flags.suppress_diff_headers)
3593 ecbdata.header = &header;
582aa00b 3594 xpp.flags = o->xdl_opts;
296d4a94
MK
3595 xpp.ignore_regex = o->ignore_regex;
3596 xpp.ignore_regex_nr = o->ignore_regex_nr;
2477ab2e
JT
3597 xpp.anchors = o->anchors;
3598 xpp.anchors_nr = o->anchors_nr;
ee1e5412 3599 xecfg.ctxlen = o->context;
6d0e674a 3600 xecfg.interhunkctxlen = o->interhunkcontext;
6973dcae 3601 xecfg.flags = XDL_EMIT_FUNCNAMES;
0d1e0e78 3602 if (o->flags.funccontext)
14937c2c 3603 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
45e7ca0f 3604 if (pe)
a013585b 3605 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
0da0e926
JK
3606
3607 diffopts = getenv("GIT_DIFF_OPTS");
6973dcae
JH
3608 if (!diffopts)
3609 ;
ae021d87
JK
3610 else if (skip_prefix(diffopts, "--unified=", &v))
3611 xecfg.ctxlen = strtoul(v, NULL, 10);
3612 else if (skip_prefix(diffopts, "-u", &v))
3613 xecfg.ctxlen = strtoul(v, NULL, 10);
0da0e926 3614
77d1a520
TR
3615 if (o->word_diff)
3616 init_diff_words_data(&ecbdata, o, one, two);
9346d6d1
JK
3617 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3618 &ecbdata, &xpp, &xecfg))
3efb9880 3619 die("unable to generate diff for %s", one->path);
882749a0 3620 if (o->word_diff)
f59a59e2 3621 free_diff_words_data(&ecbdata);
04427ac8
JK
3622 if (textconv_one)
3623 free(mf1.ptr);
3624 if (textconv_two)
3625 free(mf2.ptr);
8cfe5f1c 3626 xdiff_clear_find_func(&xecfg);
6973dcae
JH
3627 }
3628
3629 free_ab_and_return:
3e97c7c6 3630 strbuf_release(&header);
fc3abdf5
JH
3631 diff_free_filespec_data(one);
3632 diff_free_filespec_data(two);
6973dcae
JH
3633 free(a_one);
3634 free(b_two);
3635 return;
3636}
3637
ddf88fa6
NTND
3638static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3639{
3640 if (!is_renamed) {
3641 if (p->status == DIFF_STATUS_ADDED) {
3642 if (S_ISLNK(p->two->mode))
3643 return "new +l";
3644 else if ((p->two->mode & 0777) == 0755)
3645 return "new +x";
3646 else
3647 return "new";
3648 } else if (p->status == DIFF_STATUS_DELETED)
3649 return "gone";
3650 }
3651 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3652 return "mode -l";
3653 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3654 return "mode +l";
3655 else if ((p->one->mode & 0777) == 0644 &&
3656 (p->two->mode & 0777) == 0755)
3657 return "mode +x";
3658 else if ((p->one->mode & 0777) == 0755 &&
3659 (p->two->mode & 0777) == 0644)
3660 return "mode -x";
3661 return NULL;
3662}
3663
6973dcae
JH
3664static void builtin_diffstat(const char *name_a, const char *name_b,
3665 struct diff_filespec *one,
3666 struct diff_filespec *two,
710158e3 3667 struct diffstat_t *diffstat,
0d21efa5 3668 struct diff_options *o,
74faaa16 3669 struct diff_filepair *p)
6973dcae
JH
3670{
3671 mmfile_t mf1, mf2;
3672 struct diffstat_file *data;
ff0c7fa8 3673 int may_differ;
74faaa16
LT
3674 int complete_rewrite = 0;
3675
3676 if (!DIFF_PAIR_UNMERGED(p)) {
3677 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3678 complete_rewrite = 1;
3679 }
6973dcae
JH
3680
3681 data = diffstat_add(diffstat, name_a, name_b);
99bfd407 3682 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
ddf88fa6
NTND
3683 if (o->flags.stat_with_summary)
3684 data->comments = get_compact_summary(p, data->is_renamed);
6973dcae
JH
3685
3686 if (!one || !two) {
3687 data->is_unmerged = 1;
3688 return;
3689 }
ded0abc7 3690
ff0c7fa8
TGS
3691 /* saves some reads if true, not a guarantee of diff outcome */
3692 may_differ = !(one->oid_valid && two->oid_valid &&
3693 oideq(&one->oid, &two->oid));
352ca4e1 3694
b78ea5fc
NTND
3695 if (diff_filespec_is_binary(o->repo, one) ||
3696 diff_filespec_is_binary(o->repo, two)) {
ded0abc7 3697 data->is_binary = 1;
ff0c7fa8 3698 if (!may_differ) {
e18872b2
ZJS
3699 data->added = 0;
3700 data->deleted = 0;
3701 } else {
b78ea5fc
NTND
3702 data->added = diff_filespec_size(o->repo, two);
3703 data->deleted = diff_filespec_size(o->repo, one);
e18872b2 3704 }
ded0abc7
JK
3705 }
3706
3707 else if (complete_rewrite) {
1c37e86a
JT
3708 diff_populate_filespec(o->repo, one, NULL);
3709 diff_populate_filespec(o->repo, two, NULL);
710158e3
JH
3710 data->deleted = count_lines(one->data, one->size);
3711 data->added = count_lines(two->data, two->size);
710158e3 3712 }
6973dcae 3713
ff0c7fa8 3714 else if (may_differ) {
6973dcae
JH
3715 /* Crazy xdl interfaces.. */
3716 xpparam_t xpp;
3717 xdemitconf_t xecfg;
6973dcae 3718
b78ea5fc
NTND
3719 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3720 fill_mmfile(o->repo, &mf2, two) < 0)
ded0abc7
JK
3721 die("unable to read files to diff");
3722
9ccd0a88 3723 memset(&xpp, 0, sizeof(xpp));
30b25010 3724 memset(&xecfg, 0, sizeof(xecfg));
582aa00b 3725 xpp.flags = o->xdl_opts;
296d4a94
MK
3726 xpp.ignore_regex = o->ignore_regex;
3727 xpp.ignore_regex_nr = o->ignore_regex_nr;
2477ab2e
JT
3728 xpp.anchors = o->anchors;
3729 xpp.anchors_nr = o->anchors_nr;
f01cae91
JH
3730 xecfg.ctxlen = o->context;
3731 xecfg.interhunkctxlen = o->interhunkcontext;
5d934600
ÆAB
3732 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
3733 if (xdi_diff_outf(&mf1, &mf2, NULL,
3b40a090 3734 diffstat_consume, diffstat, &xpp, &xecfg))
3efb9880 3735 die("unable to generate diffstat for %s", one->path);
1cf3d5db
MR
3736
3737 if (DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two)) {
3738 struct diffstat_file *file =
3739 diffstat->files[diffstat->nr - 1];
3740 /*
3741 * Omit diffstats of modified files where nothing changed.
ff0c7fa8 3742 * Even if may_differ, this might be the case due to
1cf3d5db
MR
3743 * ignoring whitespace changes, etc.
3744 *
3745 * But note that we special-case additions, deletions,
3746 * renames, and mode changes as adding an empty file,
3747 * for example is still of interest.
3748 */
3749 if ((p->status == DIFF_STATUS_MODIFIED)
3750 && !file->added
3751 && !file->deleted
3752 && one->mode == two->mode) {
3753 free_diffstat_file(file);
3754 diffstat->nr--;
3755 }
3756 }
6973dcae 3757 }
fc3abdf5 3758
fc3abdf5
JH
3759 diff_free_filespec_data(one);
3760 diff_free_filespec_data(two);
6973dcae
JH
3761}
3762
88246898 3763static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 3764 const char *attr_path,
5ff10dd6
JH
3765 struct diff_filespec *one,
3766 struct diff_filespec *two,
3767 struct diff_options *o)
88246898
JS
3768{
3769 mmfile_t mf1, mf2;
3770 struct checkdiff_t data;
3771
3772 if (!two)
3773 return;
3774
3775 memset(&data, 0, sizeof(data));
88246898
JS
3776 data.filename = name_b ? name_b : name_a;
3777 data.lineno = 0;
1ba111d1 3778 data.o = o;
26d024ec 3779 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
32eaa468 3780 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
88246898 3781
b78ea5fc
NTND
3782 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3783 fill_mmfile(o->repo, &mf2, two) < 0)
88246898
JS
3784 die("unable to read files to diff");
3785
5ff10dd6
JH
3786 /*
3787 * All the other codepaths check both sides, but not checking
3788 * the "old" side here is deliberate. We are checking the newly
3789 * introduced changes, and as long as the "new" side is text, we
3790 * can and should check what it introduces.
3791 */
b78ea5fc 3792 if (diff_filespec_is_binary(o->repo, two))
fc3abdf5 3793 goto free_and_return;
88246898
JS
3794 else {
3795 /* Crazy xdl interfaces.. */
3796 xpparam_t xpp;
3797 xdemitconf_t xecfg;
88246898 3798
9ccd0a88 3799 memset(&xpp, 0, sizeof(xpp));
30b25010 3800 memset(&xecfg, 0, sizeof(xecfg));
c35539eb 3801 xecfg.ctxlen = 1; /* at least one context line */
582aa00b 3802 xpp.flags = 0;
75ab7630
JK
3803 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3804 checkdiff_consume, &data,
3efb9880
JK
3805 &xpp, &xecfg))
3806 die("unable to generate checkdiff for %s", one->path);
877f23cc 3807
467babf8 3808 if (data.ws_rule & WS_BLANK_AT_EOF) {
d68fe26f
JH
3809 struct emit_callback ecbdata;
3810 int blank_at_eof;
3811
3812 ecbdata.ws_rule = data.ws_rule;
3813 check_blank_at_eof(&mf1, &mf2, &ecbdata);
8837d335 3814 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
d68fe26f 3815
467babf8
JH
3816 if (blank_at_eof) {
3817 static char *err;
3818 if (!err)
3819 err = whitespace_error_string(WS_BLANK_AT_EOF);
3820 fprintf(o->file, "%s:%d: %s.\n",
3821 data.filename, blank_at_eof, err);
3822 data.status = 1; /* report errors */
3823 }
877f23cc 3824 }
88246898 3825 }
fc3abdf5
JH
3826 free_and_return:
3827 diff_free_filespec_data(one);
3828 diff_free_filespec_data(two);
62c64895 3829 if (data.status)
0d1e0e78 3830 o->flags.check_failed = 1;
88246898
JS
3831}
3832
6973dcae
JH
3833struct diff_filespec *alloc_filespec(const char *path)
3834{
96ffc06f 3835 struct diff_filespec *spec;
6973dcae 3836
96ffc06f 3837 FLEXPTR_ALLOC_STR(spec, path, path);
9fb88419 3838 spec->count = 1;
122aa6f9 3839 spec->is_binary = -1;
6973dcae
JH
3840 return spec;
3841}
3842
9fb88419
LT
3843void free_filespec(struct diff_filespec *spec)
3844{
3845 if (!--spec->count) {
3846 diff_free_filespec_data(spec);
3847 free(spec);
3848 }
3849}
3850
f9704c2d
BW
3851void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3852 int oid_valid, unsigned short mode)
6973dcae
JH
3853{
3854 if (mode) {
3855 spec->mode = canon_mode(mode);
f9704c2d
BW
3856 oidcpy(&spec->oid, oid);
3857 spec->oid_valid = oid_valid;
6973dcae
JH
3858 }
3859}
3860
3861/*
5adf317b 3862 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
3863 * the work tree has that object contents, return true, so that
3864 * prepare_temp_file() does not have to inflate and extract.
3865 */
b78ea5fc
NTND
3866static int reuse_worktree_file(struct index_state *istate,
3867 const char *name,
3868 const struct object_id *oid,
3869 int want_file)
6973dcae 3870{
9c5e6c80 3871 const struct cache_entry *ce;
6973dcae
JH
3872 struct stat st;
3873 int pos, len;
3874
150115ad
JH
3875 /*
3876 * We do not read the cache ourselves here, because the
6973dcae
JH
3877 * benchmark with my previous version that always reads cache
3878 * shows that it makes things worse for diff-tree comparing
3879 * two linux-2.6 kernel trees in an already checked out work
3880 * tree. This is because most diff-tree comparisons deal with
3881 * only a small number of files, while reading the cache is
3882 * expensive for a large project, and its cost outweighs the
3883 * savings we get by not inflating the object to a temporary
3884 * file. Practically, this code only helps when we are used
3885 * by diff-cache --cached, which does read the cache before
3886 * calling us.
3887 */
b78ea5fc 3888 if (!istate->cache)
6973dcae
JH
3889 return 0;
3890
1510fea7
SP
3891 /* We want to avoid the working directory if our caller
3892 * doesn't need the data in a normal file, this system
3893 * is rather slow with its stat/open/mmap/close syscalls,
3894 * and the object is contained in a pack file. The pack
3895 * is probably already open and will be faster to obtain
3896 * the data through than the working directory. Loose
3897 * objects however would tend to be slower as they need
3898 * to be individually opened and inflated.
3899 */
14c3c80c 3900 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
1510fea7
SP
3901 return 0;
3902
06dec439
JK
3903 /*
3904 * Similarly, if we'd have to convert the file contents anyway, that
3905 * makes the optimization not worthwhile.
3906 */
b78ea5fc 3907 if (!want_file && would_convert_to_git(istate, name))
06dec439
JK
3908 return 0;
3909
6973dcae 3910 len = strlen(name);
b78ea5fc 3911 pos = index_name_pos(istate, name, len);
6973dcae
JH
3912 if (pos < 0)
3913 return 0;
b78ea5fc 3914 ce = istate->cache[pos];
eadb5831
JH
3915
3916 /*
3917 * This is not the sha1 we are looking for, or
3918 * unreusable because it is not a regular file.
3919 */
9001dc2a 3920 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
6973dcae 3921 return 0;
eadb5831 3922
150115ad
JH
3923 /*
3924 * If ce is marked as "assume unchanged", there is no
3925 * guarantee that work tree matches what we are looking for.
3926 */
b4d1690d 3927 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
150115ad
JH
3928 return 0;
3929
eadb5831
JH
3930 /*
3931 * If ce matches the file in the work tree, we can reuse it.
6973dcae 3932 */
eadb5831 3933 if (ce_uptodate(ce) ||
b78ea5fc 3934 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
eadb5831
JH
3935 return 1;
3936
3937 return 0;
6973dcae
JH
3938}
3939
04786756
LT
3940static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3941{
b1ddfb91
JK
3942 struct strbuf buf = STRBUF_INIT;
3943 char *dirty = "";
8e08b419
JH
3944
3945 /* Are we looking at the work tree? */
85adbf2f 3946 if (s->dirty_submodule)
8e08b419
JH
3947 dirty = "-dirty";
3948
a0d12c44 3949 strbuf_addf(&buf, "Subproject commit %s%s\n",
3950 oid_to_hex(&s->oid), dirty);
b1ddfb91 3951 s->size = buf.len;
04786756
LT
3952 if (size_only) {
3953 s->data = NULL;
b1ddfb91
JK
3954 strbuf_release(&buf);
3955 } else {
3956 s->data = strbuf_detach(&buf, NULL);
3957 s->should_free = 1;
04786756
LT
3958 }
3959 return 0;
3960}
3961
6973dcae
JH
3962/*
3963 * While doing rename detection and pickaxe operation, we may need to
3964 * grab the data for the blob (or file) for our own in-core comparison.
3965 * diff_filespec has data and size fields for this purpose.
3966 */
b78ea5fc
NTND
3967int diff_populate_filespec(struct repository *r,
3968 struct diff_filespec *s,
1c37e86a 3969 const struct diff_populate_filespec_options *options)
6973dcae 3970{
1c37e86a
JT
3971 int size_only = options ? options->check_size_only : 0;
3972 int check_binary = options ? options->check_binary : 0;
6973dcae 3973 int err = 0;
8462ff43 3974 int conv_flags = global_conv_flags_eol;
5430bb28
JH
3975 /*
3976 * demote FAIL to WARN to allow inspecting the situation
3977 * instead of refusing.
3978 */
8462ff43
TB
3979 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3980 conv_flags = CONV_EOL_RNDTRP_WARN;
5430bb28 3981
6973dcae
JH
3982 if (!DIFF_FILE_VALID(s))
3983 die("internal error: asking to populate invalid file.");
3984 if (S_ISDIR(s->mode))
3985 return -1;
3986
6973dcae 3987 if (s->data)
fc3abdf5 3988 return 0;
04786756 3989
6e0b8ed6
JH
3990 if (size_only && 0 < s->size)
3991 return 0;
3992
302b9282 3993 if (S_ISGITLINK(s->mode))
04786756
LT
3994 return diff_populate_gitlink(s, size_only);
3995
41c9560e 3996 if (!s->oid_valid ||
b78ea5fc 3997 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
f285a2d7 3998 struct strbuf buf = STRBUF_INIT;
6973dcae
JH
3999 struct stat st;
4000 int fd;
6c510bee 4001
6973dcae 4002 if (lstat(s->path, &st) < 0) {
10e0ca84
AO
4003 err_empty:
4004 err = -1;
4005 empty:
4006 s->data = (char *)"";
4007 s->size = 0;
4008 return err;
6973dcae 4009 }
dc49cd76 4010 s->size = xsize_t(st.st_size);
6973dcae
JH
4011 if (!s->size)
4012 goto empty;
6973dcae 4013 if (S_ISLNK(st.st_mode)) {
cf219d8c
LT
4014 struct strbuf sb = STRBUF_INIT;
4015
4016 if (strbuf_readlink(&sb, s->path, s->size))
6973dcae 4017 goto err_empty;
0956a6db
RS
4018 s->size = sb.len;
4019 s->data = strbuf_detach(&sb, NULL);
cf219d8c 4020 s->should_free = 1;
6973dcae
JH
4021 return 0;
4022 }
12426e11
JH
4023
4024 /*
4025 * Even if the caller would be happy with getting
4026 * only the size, we cannot return early at this
4027 * point if the path requires us to run the content
4028 * conversion.
4029 */
b78ea5fc 4030 if (size_only && !would_convert_to_git(r->index, s->path))
cf219d8c 4031 return 0;
12426e11
JH
4032
4033 /*
4034 * Note: this check uses xsize_t(st.st_size) that may
4035 * not be the true size of the blob after it goes
4036 * through convert_to_git(). This may not strictly be
4037 * correct, but the whole point of big_file_threshold
4038 * and is_binary check being that we want to avoid
4039 * opening the file and inspecting the contents, this
4040 * is probably fine.
4041 */
1c37e86a 4042 if (check_binary &&
6bf3b813
NTND
4043 s->size > big_file_threshold && s->is_binary == -1) {
4044 s->is_binary = 1;
4045 return 0;
4046 }
6973dcae
JH
4047 fd = open(s->path, O_RDONLY);
4048 if (fd < 0)
4049 goto err_empty;
c4712e45 4050 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 4051 close(fd);
6973dcae 4052 s->should_munmap = 1;
6c510bee
LT
4053
4054 /*
4055 * Convert from working tree format to canonical git format
4056 */
b78ea5fc 4057 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
c32f749f 4058 size_t size = 0;
6c510bee
LT
4059 munmap(s->data, s->size);
4060 s->should_munmap = 0;
c32f749f
RS
4061 s->data = strbuf_detach(&buf, &size);
4062 s->size = size;
6c510bee
LT
4063 s->should_free = 1;
4064 }
6973dcae
JH
4065 }
4066 else {
c14b6f83
JT
4067 struct object_info info = {
4068 .sizep = &s->size
4069 };
4070
4071 if (!(size_only || check_binary))
4072 /*
4073 * Set contentp, since there is no chance that merely
4074 * the size is sufficient.
4075 */
4076 info.contentp = &s->data;
4077
95acf11a
JT
4078 if (options && options->missing_object_cb) {
4079 if (!oid_object_info_extended(r, &s->oid, &info,
4080 OBJECT_INFO_LOOKUP_REPLACE |
4081 OBJECT_INFO_SKIP_FETCH_OBJECT))
4082 goto object_read;
4083 options->missing_object_cb(options->missing_object_data);
4084 }
c14b6f83
JT
4085 if (oid_object_info_extended(r, &s->oid, &info,
4086 OBJECT_INFO_LOOKUP_REPLACE))
4087 die("unable to read %s", oid_to_hex(&s->oid));
4088
95acf11a 4089object_read:
1c37e86a 4090 if (size_only || check_binary) {
6bf3b813
NTND
4091 if (size_only)
4092 return 0;
4093 if (s->size > big_file_threshold && s->is_binary == -1) {
4094 s->is_binary = 1;
4095 return 0;
4096 }
6973dcae 4097 }
c14b6f83
JT
4098 if (!info.contentp) {
4099 info.contentp = &s->data;
4100 if (oid_object_info_extended(r, &s->oid, &info,
4101 OBJECT_INFO_LOOKUP_REPLACE))
4102 die("unable to read %s", oid_to_hex(&s->oid));
4103 }
6bf3b813 4104 s->should_free = 1;
6973dcae
JH
4105 }
4106 return 0;
4107}
4108
8ae92e63 4109void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
4110{
4111 if (s->should_free)
4112 free(s->data);
4113 else if (s->should_munmap)
4114 munmap(s->data, s->size);
fc3abdf5
JH
4115
4116 if (s->should_free || s->should_munmap) {
4117 s->should_free = s->should_munmap = 0;
4118 s->data = NULL;
4119 }
eede7b7d
JK
4120}
4121
4122void diff_free_filespec_data(struct diff_filespec *s)
4123{
24695934
JK
4124 if (!s)
4125 return;
4126
8ae92e63 4127 diff_free_filespec_blob(s);
6a83d902 4128 FREE_AND_NULL(s->cnt_data);
6973dcae
JH
4129}
4130
b78ea5fc
NTND
4131static void prep_temp_blob(struct index_state *istate,
4132 const char *path, struct diff_tempfile *temp,
6973dcae
JH
4133 void *blob,
4134 unsigned long size,
09bdff29 4135 const struct object_id *oid,
6973dcae
JH
4136 int mode)
4137{
4e218f54 4138 struct strbuf buf = STRBUF_INIT;
c2a46a7c 4139 struct strbuf tempfile = STRBUF_INIT;
003b33a8
DA
4140 char *path_dup = xstrdup(path);
4141 const char *base = basename(path_dup);
c397aac0 4142 struct checkout_metadata meta;
4143
4144 init_checkout_metadata(&meta, NULL, NULL, oid);
6973dcae 4145
003b33a8 4146 /* Generate "XXXXXX_basename.ext" */
c2a46a7c
BW
4147 strbuf_addstr(&tempfile, "XXXXXX_");
4148 strbuf_addstr(&tempfile, base);
003b33a8 4149
c2a46a7c 4150 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
076aa2cb 4151 if (!temp->tempfile)
d824cbba 4152 die_errno("unable to create temp-file");
b78ea5fc 4153 if (convert_to_working_tree(istate, path,
c397aac0 4154 (const char *)blob, (size_t)size, &buf, &meta)) {
4e218f54
JS
4155 blob = buf.buf;
4156 size = buf.len;
4157 }
c50424a6 4158 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
076aa2cb 4159 close_tempfile_gently(temp->tempfile))
0721c314 4160 die_errno("unable to write temp-file");
076aa2cb 4161 temp->name = get_tempfile_path(temp->tempfile);
09bdff29 4162 oid_to_hex_r(temp->hex, oid);
5096d490 4163 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4e218f54 4164 strbuf_release(&buf);
c2a46a7c 4165 strbuf_release(&tempfile);
003b33a8 4166 free(path_dup);
6973dcae
JH
4167}
4168
b78ea5fc
NTND
4169static struct diff_tempfile *prepare_temp_file(struct repository *r,
4170 const char *name,
4171 struct diff_filespec *one)
6973dcae 4172{
479b0ae8
JK
4173 struct diff_tempfile *temp = claim_diff_tempfile();
4174
6973dcae
JH
4175 if (!DIFF_FILE_VALID(one)) {
4176 not_a_valid_file:
4177 /* A '-' entry produces this for file-2, and
4178 * a '+' entry produces this for file-1.
4179 */
4180 temp->name = "/dev/null";
5096d490
JK
4181 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4182 xsnprintf(temp->mode, sizeof(temp->mode), ".");
479b0ae8
JK
4183 return temp;
4184 }
4185
aba47272 4186 if (!S_ISGITLINK(one->mode) &&
41c9560e 4187 (!one->oid_valid ||
b78ea5fc 4188 reuse_worktree_file(r->index, name, &one->oid, 1))) {
6973dcae
JH
4189 struct stat st;
4190 if (lstat(name, &st) < 0) {
4191 if (errno == ENOENT)
4192 goto not_a_valid_file;
d824cbba 4193 die_errno("stat(%s)", name);
6973dcae
JH
4194 }
4195 if (S_ISLNK(st.st_mode)) {
3cd7388d
JK
4196 struct strbuf sb = STRBUF_INIT;
4197 if (strbuf_readlink(&sb, name, st.st_size) < 0)
0721c314 4198 die_errno("readlink(%s)", name);
b78ea5fc 4199 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
41c9560e 4200 (one->oid_valid ?
14228447 4201 &one->oid : null_oid()),
41c9560e 4202 (one->oid_valid ?
6973dcae 4203 one->mode : S_IFLNK));
3cd7388d 4204 strbuf_release(&sb);
6973dcae
JH
4205 }
4206 else {
4207 /* we can borrow from the file in the work tree */
4208 temp->name = name;
41c9560e 4209 if (!one->oid_valid)
14228447 4210 oid_to_hex_r(temp->hex, null_oid());
6973dcae 4211 else
2490574d 4212 oid_to_hex_r(temp->hex, &one->oid);
6973dcae
JH
4213 /* Even though we may sometimes borrow the
4214 * contents from the work tree, we always want
4215 * one->mode. mode is trustworthy even when
74014152 4216 * !(one->oid_valid), as long as
6973dcae
JH
4217 * DIFF_FILE_VALID(one).
4218 */
5096d490 4219 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
6973dcae 4220 }
479b0ae8 4221 return temp;
6973dcae
JH
4222 }
4223 else {
1c37e86a 4224 if (diff_populate_filespec(r, one, NULL))
6973dcae 4225 die("cannot read data blob for %s", one->path);
b78ea5fc
NTND
4226 prep_temp_blob(r->index, name, temp,
4227 one->data, one->size,
09bdff29 4228 &one->oid, one->mode);
6973dcae 4229 }
479b0ae8 4230 return temp;
6973dcae
JH
4231}
4232
b78ea5fc 4233static void add_external_diff_name(struct repository *r,
ef8d7ac4 4234 struct strvec *argv,
f3efe787
JK
4235 const char *name,
4236 struct diff_filespec *df)
4237{
b78ea5fc 4238 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
ef8d7ac4
JK
4239 strvec_push(argv, temp->name);
4240 strvec_push(argv, temp->hex);
4241 strvec_push(argv, temp->mode);
f3efe787
JK
4242}
4243
6973dcae
JH
4244/* An external diff command takes:
4245 *
4246 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4247 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4248 *
4249 */
4250static void run_external_diff(const char *pgm,
4251 const char *name,
4252 const char *other,
4253 struct diff_filespec *one,
4254 struct diff_filespec *two,
4255 const char *xfrm_msg,
ee7fb0b1 4256 struct diff_options *o)
6973dcae 4257{
ef8d7ac4
JK
4258 struct strvec argv = STRVEC_INIT;
4259 struct strvec env = STRVEC_INIT;
ee7fb0b1 4260 struct diff_queue_struct *q = &diff_queued_diff;
6973dcae 4261
ef8d7ac4
JK
4262 strvec_push(&argv, pgm);
4263 strvec_push(&argv, name);
6973dcae 4264
6973dcae 4265 if (one && two) {
b78ea5fc 4266 add_external_diff_name(o->repo, &argv, name, one);
f3efe787 4267 if (!other)
b78ea5fc 4268 add_external_diff_name(o->repo, &argv, name, two);
f3efe787 4269 else {
b78ea5fc 4270 add_external_diff_name(o->repo, &argv, other, two);
ef8d7ac4
JK
4271 strvec_push(&argv, other);
4272 strvec_push(&argv, xfrm_msg);
6973dcae 4273 }
6973dcae 4274 }
ee7fb0b1 4275
ef8d7ac4
JK
4276 strvec_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4277 strvec_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
ee7fb0b1 4278
3aef54e8
JS
4279 diff_free_filespec_data(one);
4280 diff_free_filespec_data(two);
d70a9eb6 4281 if (run_command_v_opt_cd_env(argv.v, RUN_USING_SHELL, NULL, env.v))
89294d14 4282 die(_("external diff died, stopping at %s"), name);
ee7fb0b1 4283
6973dcae 4284 remove_tempfile();
ef8d7ac4
JK
4285 strvec_clear(&argv);
4286 strvec_clear(&env);
6973dcae
JH
4287}
4288
b67b9612
JH
4289static int similarity_index(struct diff_filepair *p)
4290{
4291 return p->score * 100 / MAX_SCORE;
4292}
4293
4f03666a
JK
4294static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4295{
4296 if (startup_info->have_repository)
aab9583f 4297 return find_unique_abbrev(oid, abbrev);
4f03666a
JK
4298 else {
4299 char *hex = oid_to_hex(oid);
0d9c527d
JH
4300 if (abbrev < 0)
4301 abbrev = FALLBACK_DEFAULT_ABBREV;
02afca1e 4302 if (abbrev > the_hash_algo->hexsz)
033abf97 4303 BUG("oid abbreviation out of range: %d", abbrev);
43d1948b
JB
4304 if (abbrev)
4305 hex[abbrev] = '\0';
4f03666a
JK
4306 return hex;
4307 }
4308}
4309
b67b9612
JH
4310static void fill_metainfo(struct strbuf *msg,
4311 const char *name,
4312 const char *other,
4313 struct diff_filespec *one,
4314 struct diff_filespec *two,
4315 struct diff_options *o,
37466447 4316 struct diff_filepair *p,
5977744d 4317 int *must_show_header,
37466447 4318 int use_color)
b67b9612 4319{
37466447
BW
4320 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4321 const char *reset = diff_get_color(use_color, DIFF_RESET);
30997bb8 4322 const char *line_prefix = diff_line_prefix(o);
7be57610 4323
296c6bb2 4324 *must_show_header = 1;
b67b9612
JH
4325 strbuf_init(msg, PATH_MAX * 2 + 300);
4326 switch (p->status) {
4327 case DIFF_STATUS_COPIED:
98ad90fb
JH
4328 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4329 line_prefix, set, similarity_index(p));
4330 strbuf_addf(msg, "%s\n%s%scopy from ",
4331 reset, line_prefix, set);
b67b9612 4332 quote_c_style(name, msg, NULL, 0);
98ad90fb 4333 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
b67b9612 4334 quote_c_style(other, msg, NULL, 0);
37466447 4335 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
4336 break;
4337 case DIFF_STATUS_RENAMED:
98ad90fb
JH
4338 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4339 line_prefix, set, similarity_index(p));
4340 strbuf_addf(msg, "%s\n%s%srename from ",
4341 reset, line_prefix, set);
b67b9612 4342 quote_c_style(name, msg, NULL, 0);
98ad90fb
JH
4343 strbuf_addf(msg, "%s\n%s%srename to ",
4344 reset, line_prefix, set);
b67b9612 4345 quote_c_style(other, msg, NULL, 0);
37466447 4346 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
4347 break;
4348 case DIFF_STATUS_MODIFIED:
4349 if (p->score) {
98ad90fb
JH
4350 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4351 line_prefix,
37466447 4352 set, similarity_index(p), reset);
b67b9612
JH
4353 break;
4354 }
4355 /* fallthru */
4356 default:
296c6bb2 4357 *must_show_header = 0;
b67b9612 4358 }
9001dc2a 4359 if (one && two && !oideq(&one->oid, &two->oid)) {
de1d81d5 4360 const unsigned hexsz = the_hash_algo->hexsz;
3046c7f6
ĐTCD
4361 int abbrev = o->abbrev ? o->abbrev : DEFAULT_ABBREV;
4362
4363 if (o->flags.full_index)
4364 abbrev = hexsz;
b67b9612 4365
0d1e0e78 4366 if (o->flags.binary) {
b67b9612 4367 mmfile_t mf;
b78ea5fc
NTND
4368 if ((!fill_mmfile(o->repo, &mf, one) &&
4369 diff_filespec_is_binary(o->repo, one)) ||
4370 (!fill_mmfile(o->repo, &mf, two) &&
4371 diff_filespec_is_binary(o->repo, two)))
de1d81d5 4372 abbrev = hexsz;
b67b9612 4373 }
4f03666a
JK
4374 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4375 diff_abbrev_oid(&one->oid, abbrev),
4376 diff_abbrev_oid(&two->oid, abbrev));
b67b9612
JH
4377 if (one->mode == two->mode)
4378 strbuf_addf(msg, " %06o", one->mode);
37466447 4379 strbuf_addf(msg, "%s\n", reset);
b67b9612 4380 }
b67b9612
JH
4381}
4382
6973dcae
JH
4383static void run_diff_cmd(const char *pgm,
4384 const char *name,
4385 const char *other,
cd676a51 4386 const char *attr_path,
6973dcae
JH
4387 struct diff_filespec *one,
4388 struct diff_filespec *two,
b67b9612 4389 struct strbuf *msg,
051308f6 4390 struct diff_options *o,
b67b9612 4391 struct diff_filepair *p)
6973dcae 4392{
b67b9612
JH
4393 const char *xfrm_msg = NULL;
4394 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
296c6bb2 4395 int must_show_header = 0;
b67b9612 4396
bd8c1a9b 4397
0d1e0e78 4398 if (o->flags.allow_external) {
acd00ea0
NTND
4399 struct userdiff_driver *drv;
4400
4401 drv = userdiff_find_by_path(o->repo->index, attr_path);
be58e70d
JK
4402 if (drv && drv->external)
4403 pgm = drv->external;
f1af60bd
JH
4404 }
4405
37466447
BW
4406 if (msg) {
4407 /*
4408 * don't use colors when the header is intended for an
4409 * external diff driver
4410 */
4411 fill_metainfo(msg, name, other, one, two, o, p,
5977744d 4412 &must_show_header,
daa0c3d9 4413 want_color(o->use_color) && !pgm);
37466447
BW
4414 xfrm_msg = msg->len ? msg->buf : NULL;
4415 }
4416
6973dcae 4417 if (pgm) {
4bc17927 4418 run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
6973dcae
JH
4419 return;
4420 }
4421 if (one && two)
4422 builtin_diff(name, other ? other : name,
296c6bb2
CC
4423 one, two, xfrm_msg, must_show_header,
4424 o, complete_rewrite);
6973dcae 4425 else
c0c77734 4426 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
4427}
4428
58bf2a4c 4429static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
6973dcae
JH
4430{
4431 if (DIFF_FILE_VALID(one)) {
41c9560e 4432 if (!one->oid_valid) {
6973dcae 4433 struct stat st;
4682d852 4434 if (one->is_stdin) {
a0d12c44 4435 oidclr(&one->oid);
5332b2af
JS
4436 return;
4437 }
6973dcae 4438 if (lstat(one->path, &st) < 0)
0721c314 4439 die_errno("stat '%s'", one->path);
58bf2a4c 4440 if (index_path(istate, &one->oid, one->path, &st, 0))
d7530708 4441 die("cannot hash %s", one->path);
6973dcae
JH
4442 }
4443 }
4444 else
a0d12c44 4445 oidclr(&one->oid);
6973dcae
JH
4446}
4447
cd676a51
JH
4448static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4449{
4450 /* Strip the prefix but do not molest /dev/null and absolute paths */
ffd04e92 4451 if (*namep && !is_absolute_path(*namep)) {
cd676a51 4452 *namep += prefix_length;
d8faea9d
JN
4453 if (**namep == '/')
4454 ++*namep;
4455 }
ffd04e92 4456 if (*otherp && !is_absolute_path(*otherp)) {
cd676a51 4457 *otherp += prefix_length;
d8faea9d
JN
4458 if (**otherp == '/')
4459 ++*otherp;
4460 }
cd676a51
JH
4461}
4462
6973dcae
JH
4463static void run_diff(struct diff_filepair *p, struct diff_options *o)
4464{
4465 const char *pgm = external_diff();
663af342 4466 struct strbuf msg;
663af342
PH
4467 struct diff_filespec *one = p->one;
4468 struct diff_filespec *two = p->two;
6973dcae
JH
4469 const char *name;
4470 const char *other;
cd676a51 4471 const char *attr_path;
663af342 4472
f2d2a5de
SB
4473 name = one->path;
4474 other = (strcmp(name, two->path) ? two->path : NULL);
cd676a51
JH
4475 attr_path = name;
4476 if (o->prefix_length)
4477 strip_prefix(o->prefix_length, &name, &other);
6973dcae 4478
0d1e0e78 4479 if (!o->flags.allow_external)
bd8c1a9b
JH
4480 pgm = NULL;
4481
6973dcae 4482 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51 4483 run_diff_cmd(pgm, name, NULL, attr_path,
b67b9612 4484 NULL, NULL, NULL, o, p);
6973dcae
JH
4485 return;
4486 }
4487
58bf2a4c
NTND
4488 diff_fill_oid_info(one, o->repo->index);
4489 diff_fill_oid_info(two, o->repo->index);
6973dcae 4490
6973dcae
JH
4491 if (!pgm &&
4492 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4493 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
b67b9612
JH
4494 /*
4495 * a filepair that changes between file and symlink
6973dcae
JH
4496 * needs to be split into deletion and creation.
4497 */
4498 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51 4499 run_diff_cmd(NULL, name, other, attr_path,
b78ea5fc
NTND
4500 one, null, &msg,
4501 o, p);
6973dcae 4502 free(null);
b67b9612
JH
4503 strbuf_release(&msg);
4504
6973dcae 4505 null = alloc_filespec(one->path);
cd676a51 4506 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 4507 null, two, &msg, o, p);
6973dcae
JH
4508 free(null);
4509 }
4510 else
cd676a51 4511 run_diff_cmd(pgm, name, other, attr_path,
b67b9612 4512 one, two, &msg, o, p);
6973dcae 4513
663af342 4514 strbuf_release(&msg);
6973dcae
JH
4515}
4516
4517static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4518 struct diffstat_t *diffstat)
4519{
4520 const char *name;
4521 const char *other;
4522
4523 if (DIFF_PAIR_UNMERGED(p)) {
4524 /* unmerged */
b78ea5fc
NTND
4525 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4526 diffstat, o, p);
6973dcae
JH
4527 return;
4528 }
4529
4530 name = p->one->path;
4531 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4532
cd676a51
JH
4533 if (o->prefix_length)
4534 strip_prefix(o->prefix_length, &name, &other);
4535
58bf2a4c
NTND
4536 diff_fill_oid_info(p->one, o->repo->index);
4537 diff_fill_oid_info(p->two, o->repo->index);
6973dcae 4538
b78ea5fc
NTND
4539 builtin_diffstat(name, other, p->one, p->two,
4540 diffstat, o, p);
6973dcae
JH
4541}
4542
88246898
JS
4543static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4544{
4545 const char *name;
4546 const char *other;
cd676a51 4547 const char *attr_path;
88246898
JS
4548
4549 if (DIFF_PAIR_UNMERGED(p)) {
4550 /* unmerged */
4551 return;
4552 }
4553
4554 name = p->one->path;
4555 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
4556 attr_path = other ? other : name;
4557
4558 if (o->prefix_length)
4559 strip_prefix(o->prefix_length, &name, &other);
88246898 4560
58bf2a4c
NTND
4561 diff_fill_oid_info(p->one, o->repo->index);
4562 diff_fill_oid_info(p->two, o->repo->index);
88246898 4563
cd676a51 4564 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
4565}
4566
4a288478
NTND
4567static void prep_parse_options(struct diff_options *options);
4568
e6757652 4569void repo_diff_setup(struct repository *r, struct diff_options *options)
6973dcae 4570{
be4f2b40 4571 memcpy(options, &default_diff_options, sizeof(*options));
c0c77734
DB
4572
4573 options->file = stdout;
e6757652 4574 options->repo = r;
c0c77734 4575
7648b79e
SB
4576 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4577 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4578 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
43d1948b 4579 options->abbrev = DEFAULT_ABBREV;
6973dcae
JH
4580 options->line_termination = '\n';
4581 options->break_opt = -1;
4582 options->rename_limit = -1;
712d2c7d 4583 options->dirstat_permille = diff_dirstat_permille_default;
6468a4e5 4584 options->context = diff_context_default;
c4888677 4585 options->interhunkcontext = diff_interhunk_context_default;
a17505f2 4586 options->ws_error_highlight = ws_error_highlight_default;
0d1e0e78 4587 options->flags.rename_empty = 1;
c28ded83 4588 options->flags.relative_name = diff_relative;
15af58c1 4589 options->objfind = NULL;
6973dcae 4590
72441af7 4591 /* pathchange left =NULL by default */
6973dcae
JH
4592 options->change = diff_change;
4593 options->add_remove = diff_addremove;
f1c96261 4594 options->use_color = diff_use_color_default;
b68ea12e 4595 options->detect_rename = diff_detect_rename_default;
07ab4dec 4596 options->xdl_opts |= diff_algorithm;
433860f3
MH
4597 if (diff_indent_heuristic)
4598 DIFF_XDL_SET(options, INDENT_HEURISTIC);
eab9a40b 4599
6d8940b5
SB
4600 options->orderfile = diff_order_file_cfg;
4601
8ef93124
SJ
4602 if (!options->flags.ignore_submodule_set)
4603 options->flags.ignore_untracked_in_submodules = 1;
4604
f89504dd
EC
4605 if (diff_no_prefix) {
4606 options->a_prefix = options->b_prefix = "";
4607 } else if (!diff_mnemonic_prefix) {
a5a818ee
JH
4608 options->a_prefix = "a/";
4609 options->b_prefix = "b/";
4610 }
2e2d5ac1
SB
4611
4612 options->color_moved = diff_color_moved_default;
626c0b5d 4613 options->color_moved_ws_handling = diff_color_moved_ws_default;
4a288478
NTND
4614
4615 prep_parse_options(options);
6973dcae
JH
4616}
4617
28452655 4618void diff_setup_done(struct diff_options *options)
6973dcae 4619{
4d8c51aa
SB
4620 unsigned check_mask = DIFF_FORMAT_NAME |
4621 DIFF_FORMAT_NAME_STATUS |
4622 DIFF_FORMAT_CHECKDIFF |
4623 DIFF_FORMAT_NO_OUTPUT;
de1d81d5 4624 /*
4625 * This must be signed because we're comparing against a potentially
4626 * negative value.
4627 */
4628 const int hexsz = the_hash_algo->hexsz;
d7de00f7 4629
6c374008
JH
4630 if (options->set_default)
4631 options->set_default(options);
4632
4d8c51aa 4633 if (HAS_MULTI_BITS(options->output_format & check_mask))
a2f05c94 4634 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
d7de00f7 4635
5e505257
SB
4636 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4637 die(_("-G, -S and --find-object are mutually exclusive"));
4638
188e9e28
ÆAB
4639 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_G_REGEX_MASK))
4640 die(_("-G and --pickaxe-regex are mutually exclusive, use --pickaxe-regex with -S"));
4641
d26ec880 4642 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_ALL_OBJFIND_MASK))
11c649b8 4643 die(_("--pickaxe-all and --find-object are mutually exclusive, use --pickaxe-all with -G and -S"));
d26ec880 4644
f245194f
JH
4645 /*
4646 * Most of the time we can say "there are changes"
4647 * only by checking if there are changed paths, but
4648 * --ignore-whitespace* options force us to look
97bf2a08 4649 * inside contents.
f245194f
JH
4650 */
4651
50f04394
JH
4652 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS) ||
4653 options->ignore_regex_nr)
0d1e0e78 4654 options->flags.diff_from_contents = 1;
f245194f 4655 else
0d1e0e78 4656 options->flags.diff_from_contents = 0;
f245194f 4657
0d1e0e78 4658 if (options->flags.find_copies_harder)
03b9d560
JH
4659 options->detect_rename = DIFF_DETECT_COPY;
4660
0d1e0e78 4661 if (!options->flags.relative_name)
cd676a51
JH
4662 options->prefix = NULL;
4663 if (options->prefix)
4664 options->prefix_length = strlen(options->prefix);
4665 else
4666 options->prefix_length = 0;
4667
c6744349
TH
4668 if (options->output_format & (DIFF_FORMAT_NAME |
4669 DIFF_FORMAT_NAME_STATUS |
4670 DIFF_FORMAT_CHECKDIFF |
4671 DIFF_FORMAT_NO_OUTPUT))
4672 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 4673 DIFF_FORMAT_NUMSTAT |
c6744349 4674 DIFF_FORMAT_DIFFSTAT |
ebd124c6 4675 DIFF_FORMAT_SHORTSTAT |
7df7c019 4676 DIFF_FORMAT_DIRSTAT |
c6744349
TH
4677 DIFF_FORMAT_SUMMARY |
4678 DIFF_FORMAT_PATCH);
4679
6973dcae
JH
4680 /*
4681 * These cases always need recursive; we do not drop caller-supplied
4682 * recursive bits for other formats here.
4683 */
c6744349 4684 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 4685 DIFF_FORMAT_NUMSTAT |
c6744349 4686 DIFF_FORMAT_DIFFSTAT |
ebd124c6 4687 DIFF_FORMAT_SHORTSTAT |
7df7c019 4688 DIFF_FORMAT_DIRSTAT |
d7014dc0 4689 DIFF_FORMAT_SUMMARY |
c6744349 4690 DIFF_FORMAT_CHECKDIFF))
0d1e0e78 4691 options->flags.recursive = 1;
5e363541 4692 /*
3969cf7d 4693 * Also pickaxe would not work very well if you do not say recursive
5e363541 4694 */
cf63051a 4695 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
0d1e0e78 4696 options->flags.recursive = 1;
ae6d5c1b
JL
4697 /*
4698 * When patches are generated, submodules diffed against the work tree
4699 * must be checked for dirtiness too so it can be shown in the output
4700 */
4701 if (options->output_format & DIFF_FORMAT_PATCH)
0d1e0e78 4702 options->flags.dirty_submodules = 1;
5e363541 4703
6973dcae
JH
4704 if (options->detect_rename && options->rename_limit < 0)
4705 options->rename_limit = diff_rename_limit_default;
de1d81d5 4706 if (hexsz < options->abbrev)
4707 options->abbrev = hexsz; /* full */
6973dcae 4708
68aacb2f
JH
4709 /*
4710 * It does not make sense to show the first hit we happened
4711 * to have found. It does not make sense not to return with
4712 * exit code in such a case either.
4713 */
0d1e0e78 4714 if (options->flags.quick) {
68aacb2f 4715 options->output_format = DIFF_FORMAT_NO_OUTPUT;
0d1e0e78 4716 options->flags.exit_with_status = 1;
68aacb2f 4717 }
ee7fb0b1 4718
0ea7d5b6 4719 options->diff_path_counter = 0;
b0e2c999 4720
0d1e0e78 4721 if (options->flags.follow_renames && options->pathspec.nr != 1)
dd63f169 4722 die(_("--follow requires exactly one pathspec"));
2e2d5ac1
SB
4723
4724 if (!options->use_color || external_diff())
4725 options->color_moved = 0;
4a288478
NTND
4726
4727 FREE_AND_NULL(options->parseopts);
6973dcae
JH
4728}
4729
dea007fb
MM
4730int parse_long_opt(const char *opt, const char **argv,
4731 const char **optarg)
4732{
4733 const char *arg = argv[0];
95b567c7 4734 if (!skip_prefix(arg, "--", &arg))
dea007fb 4735 return 0;
95b567c7 4736 if (!skip_prefix(arg, opt, &arg))
dea007fb 4737 return 0;
b0d12fc9 4738 if (*arg == '=') { /* stuck form: --option=value */
dea007fb
MM
4739 *optarg = arg + 1;
4740 return 1;
4741 }
4742 if (*arg != '\0')
4743 return 0;
4744 /* separate form: --option value */
4745 if (!argv[1])
4746 die("Option '--%s' requires a value", opt);
4747 *optarg = argv[1];
4748 return 2;
4749}
4750
84b5089e 4751static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4d7f7a4a 4752{
84b5089e 4753 struct diff_options *options = opt->value;
4d7f7a4a
JN
4754 int width = options->stat_width;
4755 int name_width = options->stat_name_width;
969fe57b 4756 int graph_width = options->stat_graph_width;
808e1db2 4757 int count = options->stat_count;
84b5089e 4758 char *end;
4d7f7a4a 4759
84b5089e 4760 BUG_ON_OPT_NEG(unset);
4d7f7a4a 4761
84b5089e
NTND
4762 if (!strcmp(opt->long_name, "stat")) {
4763 if (value) {
4764 width = strtoul(value, &end, 10);
4765 if (*end == ',')
4766 name_width = strtoul(end+1, &end, 10);
4767 if (*end == ',')
4768 count = strtoul(end+1, &end, 10);
4769 if (*end)
4770 return error(_("invalid --stat value: %s"), value);
1e57208e 4771 }
84b5089e
NTND
4772 } else if (!strcmp(opt->long_name, "stat-width")) {
4773 width = strtoul(value, &end, 10);
4774 if (*end)
4775 return error(_("%s expects a numerical value"),
4776 opt->long_name);
4777 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4778 name_width = strtoul(value, &end, 10);
4779 if (*end)
4780 return error(_("%s expects a numerical value"),
4781 opt->long_name);
4782 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4783 graph_width = strtoul(value, &end, 10);
4784 if (*end)
4785 return error(_("%s expects a numerical value"),
4786 opt->long_name);
4787 } else if (!strcmp(opt->long_name, "stat-count")) {
4788 count = strtoul(value, &end, 10);
4789 if (*end)
4790 return error(_("%s expects a numerical value"),
4791 opt->long_name);
4792 } else
4793 BUG("%s should not get here", opt->long_name);
4d7f7a4a 4794
4d7f7a4a
JN
4795 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4796 options->stat_name_width = name_width;
969fe57b 4797 options->stat_graph_width = graph_width;
4d7f7a4a 4798 options->stat_width = width;
808e1db2 4799 options->stat_count = count;
84b5089e 4800 return 0;
4d7f7a4a
JN
4801}
4802
333f3fb0
JH
4803static int parse_dirstat_opt(struct diff_options *options, const char *params)
4804{
51670fc8
JH
4805 struct strbuf errmsg = STRBUF_INIT;
4806 if (parse_dirstat_params(options, params, &errmsg))
7478ac57 4807 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
51670fc8
JH
4808 errmsg.buf);
4809 strbuf_release(&errmsg);
333f3fb0
JH
4810 /*
4811 * The caller knows a dirstat-related option is given from the command
4812 * line; allow it to say "return this_function();"
4813 */
4814 options->output_format |= DIFF_FORMAT_DIRSTAT;
4815 return 1;
4816}
4817
1ecc1cbd
JH
4818static const char diff_status_letters[] = {
4819 DIFF_STATUS_ADDED,
4820 DIFF_STATUS_COPIED,
4821 DIFF_STATUS_DELETED,
4822 DIFF_STATUS_MODIFIED,
4823 DIFF_STATUS_RENAMED,
4824 DIFF_STATUS_TYPE_CHANGED,
4825 DIFF_STATUS_UNKNOWN,
4826 DIFF_STATUS_UNMERGED,
4827 DIFF_STATUS_FILTER_AON,
4828 DIFF_STATUS_FILTER_BROKEN,
4829 '\0',
4830};
4831
4832static unsigned int filter_bit['Z' + 1];
4833
4834static void prepare_filter_bits(void)
4835{
4836 int i;
4837
4838 if (!filter_bit[DIFF_STATUS_ADDED]) {
4839 for (i = 0; diff_status_letters[i]; i++)
4840 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4841 }
4842}
4843
4844static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4845{
4846 return opt->filter & filter_bit[(int) status];
4847}
4848
cdb5330a 4849unsigned diff_filter_bit(char status)
1ecc1cbd 4850{
cdb5330a
NTND
4851 prepare_filter_bits();
4852 return filter_bit[(int) status];
4853}
4854
d2d3f273
NTND
4855static int diff_opt_diff_filter(const struct option *option,
4856 const char *optarg, int unset)
1ecc1cbd 4857{
d2d3f273 4858 struct diff_options *opt = option->value;
1ecc1cbd
JH
4859 int i, optch;
4860
d2d3f273 4861 BUG_ON_OPT_NEG(unset);
1ecc1cbd 4862 prepare_filter_bits();
7f2ea5f0
JH
4863
4864 /*
4865 * If there is a negation e.g. 'd' in the input, and we haven't
4866 * initialized the filter field with another --diff-filter, start
4867 * from full set of bits, except for AON.
4868 */
4869 if (!opt->filter) {
4870 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4871 if (optch < 'a' || 'z' < optch)
4872 continue;
4873 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4874 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4875 break;
4876 }
4877 }
4878
1ecc1cbd
JH
4879 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4880 unsigned int bit;
7f2ea5f0
JH
4881 int negate;
4882
4883 if ('a' <= optch && optch <= 'z') {
4884 negate = 1;
4885 optch = toupper(optch);
4886 } else {
4887 negate = 0;
4888 }
1ecc1cbd
JH
4889
4890 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4891 if (!bit)
d2d3f273
NTND
4892 return error(_("unknown change class '%c' in --diff-filter=%s"),
4893 optarg[i], optarg);
7f2ea5f0
JH
4894 if (negate)
4895 opt->filter &= ~bit;
4896 else
4897 opt->filter |= bit;
1ecc1cbd
JH
4898 }
4899 return 0;
4900}
4901
3b335762
NTND
4902static void enable_patch_output(int *fmt)
4903{
71482d38
MM
4904 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4905 *fmt |= DIFF_FORMAT_PATCH;
4906}
4907
5a749d9f
NTND
4908static int diff_opt_ws_error_highlight(const struct option *option,
4909 const char *arg, int unset)
b8767f79 4910{
5a749d9f 4911 struct diff_options *opt = option->value;
077965f8 4912 int val = parse_ws_error_highlight(arg);
b8767f79 4913
5a749d9f
NTND
4914 BUG_ON_OPT_NEG(unset);
4915 if (val < 0)
4916 return error(_("unknown value after ws-error-highlight=%.*s"),
4917 -1 - val, arg);
b8767f79 4918 opt->ws_error_highlight = val;
5a749d9f 4919 return 0;
b8767f79
JH
4920}
4921
a75f28cb
NTND
4922static int diff_opt_find_object(const struct option *option,
4923 const char *arg, int unset)
15af58c1 4924{
a75f28cb 4925 struct diff_options *opt = option->value;
15af58c1
SB
4926 struct object_id oid;
4927
a75f28cb 4928 BUG_ON_OPT_NEG(unset);
15af58c1 4929 if (get_oid(arg, &oid))
a75f28cb 4930 return error(_("unable to resolve '%s'"), arg);
15af58c1
SB
4931
4932 if (!opt->objfind)
ca56dadb 4933 CALLOC_ARRAY(opt->objfind, 1);
15af58c1
SB
4934
4935 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4936 opt->flags.recursive = 1;
4937 opt->flags.tree_in_recursive = 1;
4938 oidset_insert(opt->objfind, &oid);
a75f28cb 4939 return 0;
15af58c1
SB
4940}
4941
df84a436
NTND
4942static int diff_opt_anchored(const struct option *opt,
4943 const char *arg, int unset)
4944{
4945 struct diff_options *options = opt->value;
4946
4947 BUG_ON_OPT_NEG(unset);
4948 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4949 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4950 options->anchors_alloc);
4951 options->anchors[options->anchors_nr++] = xstrdup(arg);
4952 return 0;
4953}
4954
6d9af6f4
NTND
4955static int diff_opt_binary(const struct option *opt,
4956 const char *arg, int unset)
4957{
4958 struct diff_options *options = opt->value;
4959
4960 BUG_ON_OPT_NEG(unset);
4961 BUG_ON_OPT_ARG(arg);
4962 enable_patch_output(&options->output_format);
4963 options->flags.binary = 1;
4964 return 0;
4965}
4966
ced4e179
NTND
4967static int diff_opt_break_rewrites(const struct option *opt,
4968 const char *arg, int unset)
4969{
4970 int *break_opt = opt->value;
4971 int opt1, opt2;
4972
4973 BUG_ON_OPT_NEG(unset);
4974 if (!arg)
4975 arg = "";
4976 opt1 = parse_rename_score(&arg);
4977 if (*arg == 0)
4978 opt2 = 0;
4979 else if (*arg != '/')
4980 return error(_("%s expects <n>/<m> form"), opt->long_name);
4981 else {
4982 arg++;
4983 opt2 = parse_rename_score(&arg);
4984 }
4985 if (*arg != 0)
4986 return error(_("%s expects <n>/<m> form"), opt->long_name);
4987 *break_opt = opt1 | (opt2 << 16);
4988 return 0;
4989}
4990
af2f3680
NTND
4991static int diff_opt_char(const struct option *opt,
4992 const char *arg, int unset)
4993{
4994 char *value = opt->value;
4995
4996 BUG_ON_OPT_NEG(unset);
4997 if (arg[1])
4998 return error(_("%s expects a character, got '%s'"),
4999 opt->long_name, arg);
5000 *value = arg[0];
5001 return 0;
5002}
5003
59311a98
NTND
5004static int diff_opt_color_moved(const struct option *opt,
5005 const char *arg, int unset)
5006{
5007 struct diff_options *options = opt->value;
5008
5009 if (unset) {
5010 options->color_moved = COLOR_MOVED_NO;
5011 } else if (!arg) {
5012 if (diff_color_moved_default)
5013 options->color_moved = diff_color_moved_default;
5014 if (options->color_moved == COLOR_MOVED_NO)
5015 options->color_moved = COLOR_MOVED_DEFAULT;
5016 } else {
5017 int cm = parse_color_moved(arg);
5018 if (cm < 0)
5019 return error(_("bad --color-moved argument: %s"), arg);
5020 options->color_moved = cm;
5021 }
5022 return 0;
5023}
5024
8ce2020f
NTND
5025static int diff_opt_color_moved_ws(const struct option *opt,
5026 const char *arg, int unset)
5027{
5028 struct diff_options *options = opt->value;
5029 unsigned cm;
5030
bb987290
NTND
5031 if (unset) {
5032 options->color_moved_ws_handling = 0;
5033 return 0;
5034 }
5035
8ce2020f
NTND
5036 cm = parse_color_moved_ws(arg);
5037 if (cm & COLOR_MOVED_WS_ERROR)
5038 return error(_("invalid mode '%s' in --color-moved-ws"), arg);
5039 options->color_moved_ws_handling = cm;
5040 return 0;
5041}
5042
212db69d
NTND
5043static int diff_opt_color_words(const struct option *opt,
5044 const char *arg, int unset)
5045{
5046 struct diff_options *options = opt->value;
5047
5048 BUG_ON_OPT_NEG(unset);
5049 options->use_color = 1;
5050 options->word_diff = DIFF_WORDS_COLOR;
5051 options->word_regex = arg;
5052 return 0;
5053}
5054
7d7942b7
NTND
5055static int diff_opt_compact_summary(const struct option *opt,
5056 const char *arg, int unset)
5057{
5058 struct diff_options *options = opt->value;
5059
5060 BUG_ON_OPT_ARG(arg);
5061 if (unset) {
5062 options->flags.stat_with_summary = 0;
5063 } else {
5064 options->flags.stat_with_summary = 1;
5065 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5066 }
5067 return 0;
5068}
5069
10f35b1c
NTND
5070static int diff_opt_diff_algorithm(const struct option *opt,
5071 const char *arg, int unset)
5072{
5073 struct diff_options *options = opt->value;
5074 long value = parse_algorithm_value(arg);
5075
5076 BUG_ON_OPT_NEG(unset);
5077 if (value < 0)
5078 return error(_("option diff-algorithm accepts \"myers\", "
5079 "\"minimal\", \"patience\" and \"histogram\""));
5080
5081 /* clear out previous settings */
5082 DIFF_XDL_CLR(options, NEED_MINIMAL);
5083 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5084 options->xdl_opts |= value;
5085 return 0;
5086}
5087
4ce7aab5
NTND
5088static int diff_opt_dirstat(const struct option *opt,
5089 const char *arg, int unset)
5090{
5091 struct diff_options *options = opt->value;
5092
5093 BUG_ON_OPT_NEG(unset);
5094 if (!strcmp(opt->long_name, "cumulative")) {
5095 if (arg)
5096 BUG("how come --cumulative take a value?");
5097 arg = "cumulative";
5098 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
5099 parse_dirstat_opt(options, "files");
5100 parse_dirstat_opt(options, arg ? arg : "");
5101 return 0;
5102}
5103
7f64850d
NTND
5104static int diff_opt_find_copies(const struct option *opt,
5105 const char *arg, int unset)
5106{
5107 struct diff_options *options = opt->value;
5108
5109 BUG_ON_OPT_NEG(unset);
5110 if (!arg)
5111 arg = "";
5112 options->rename_score = parse_rename_score(&arg);
5113 if (*arg != 0)
5114 return error(_("invalid argument to %s"), opt->long_name);
5115
5116 if (options->detect_rename == DIFF_DETECT_COPY)
5117 options->flags.find_copies_harder = 1;
5118 else
5119 options->detect_rename = DIFF_DETECT_COPY;
5120
5121 return 0;
5122}
5123
f476308b
NTND
5124static int diff_opt_find_renames(const struct option *opt,
5125 const char *arg, int unset)
5126{
5127 struct diff_options *options = opt->value;
5128
5129 BUG_ON_OPT_NEG(unset);
5130 if (!arg)
5131 arg = "";
5132 options->rename_score = parse_rename_score(&arg);
5133 if (*arg != 0)
5134 return error(_("invalid argument to %s"), opt->long_name);
5135
5136 options->detect_rename = DIFF_DETECT_RENAME;
5137 return 0;
5138}
5139
1e9250b5
NTND
5140static int diff_opt_follow(const struct option *opt,
5141 const char *arg, int unset)
5142{
5143 struct diff_options *options = opt->value;
5144
5145 BUG_ON_OPT_ARG(arg);
5146 if (unset) {
5147 options->flags.follow_renames = 0;
5148 options->flags.default_follow_renames = 0;
5149 } else {
5150 options->flags.follow_renames = 1;
5151 }
5152 return 0;
5153}
5154
b680ee14
NTND
5155static int diff_opt_ignore_submodules(const struct option *opt,
5156 const char *arg, int unset)
5157{
5158 struct diff_options *options = opt->value;
5159
5160 BUG_ON_OPT_NEG(unset);
5161 if (!arg)
5162 arg = "all";
5163 options->flags.override_submodule_config = 1;
5164 handle_ignore_submodules_arg(options, arg);
5165 return 0;
5166}
5167
2f81cf98
NTND
5168static int diff_opt_line_prefix(const struct option *opt,
5169 const char *optarg, int unset)
5170{
5171 struct diff_options *options = opt->value;
5172
5173 BUG_ON_OPT_NEG(unset);
5174 options->line_prefix = optarg;
5175 options->line_prefix_length = strlen(options->line_prefix);
5176 graph_setup_line_prefix(options);
5177 return 0;
5178}
5179
11c659d8
NTND
5180static int diff_opt_no_prefix(const struct option *opt,
5181 const char *optarg, int unset)
5182{
5183 struct diff_options *options = opt->value;
5184
5185 BUG_ON_OPT_NEG(unset);
5186 BUG_ON_OPT_ARG(optarg);
5187 options->a_prefix = "";
5188 options->b_prefix = "";
5189 return 0;
5190}
5191
af2f3680
NTND
5192static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
5193 const struct option *opt,
5194 const char *arg, int unset)
5195{
5196 struct diff_options *options = opt->value;
5197 char *path;
5198
5199 BUG_ON_OPT_NEG(unset);
5200 path = prefix_filename(ctx->prefix, arg);
5201 options->file = xfopen(path, "w");
5202 options->close_file = 1;
5203 if (options->use_color != GIT_COLOR_ALWAYS)
5204 options->use_color = GIT_COLOR_NEVER;
5205 free(path);
5206 return 0;
5207}
5208
31fd640e
NTND
5209static int diff_opt_patience(const struct option *opt,
5210 const char *arg, int unset)
5211{
5212 struct diff_options *options = opt->value;
5213 int i;
5214
5215 BUG_ON_OPT_NEG(unset);
5216 BUG_ON_OPT_ARG(arg);
5217 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5218 /*
5219 * Both --patience and --anchored use PATIENCE_DIFF
5220 * internally, so remove any anchors previously
5221 * specified.
5222 */
5223 for (i = 0; i < options->anchors_nr; i++)
5224 free(options->anchors[i]);
5225 options->anchors_nr = 0;
5226 return 0;
5227}
5228
296d4a94
MK
5229static int diff_opt_ignore_regex(const struct option *opt,
5230 const char *arg, int unset)
5231{
5232 struct diff_options *options = opt->value;
5233 regex_t *regex;
5234
5235 BUG_ON_OPT_NEG(unset);
5236 regex = xmalloc(sizeof(*regex));
5237 if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE))
5238 return error(_("invalid regex given to -I: '%s'"), arg);
5239 ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1,
5240 options->ignore_regex_alloc);
5241 options->ignore_regex[options->ignore_regex_nr++] = regex;
5242 return 0;
5243}
5244
a41cfb32
NTND
5245static int diff_opt_pickaxe_regex(const struct option *opt,
5246 const char *arg, int unset)
5247{
5248 struct diff_options *options = opt->value;
5249
5250 BUG_ON_OPT_NEG(unset);
5251 options->pickaxe = arg;
5252 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5253 return 0;
5254}
5255
5256static int diff_opt_pickaxe_string(const struct option *opt,
5257 const char *arg, int unset)
5258{
5259 struct diff_options *options = opt->value;
5260
5261 BUG_ON_OPT_NEG(unset);
5262 options->pickaxe = arg;
5263 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5264 return 0;
5265}
5266
0b1c5b59
NTND
5267static int diff_opt_relative(const struct option *opt,
5268 const char *arg, int unset)
5269{
5270 struct diff_options *options = opt->value;
5271
c28ded83 5272 options->flags.relative_name = !unset;
0b1c5b59
NTND
5273 if (arg)
5274 options->prefix = arg;
5275 return 0;
5276}
5277
125dcea9
NTND
5278static int diff_opt_submodule(const struct option *opt,
5279 const char *arg, int unset)
5280{
5281 struct diff_options *options = opt->value;
5282
5283 BUG_ON_OPT_NEG(unset);
5284 if (!arg)
5285 arg = "log";
5286 if (parse_submodule_params(options, arg))
5287 return error(_("failed to parse --submodule option parameter: '%s'"),
5288 arg);
5289 return 0;
5290}
5291
8ab76977
NTND
5292static int diff_opt_textconv(const struct option *opt,
5293 const char *arg, int unset)
5294{
5295 struct diff_options *options = opt->value;
5296
5297 BUG_ON_OPT_ARG(arg);
5298 if (unset) {
5299 options->flags.allow_textconv = 0;
5300 } else {
5301 options->flags.allow_textconv = 1;
5302 options->flags.textconv_set_via_cmdline = 1;
5303 }
5304 return 0;
5305}
5306
d473e2e0
NTND
5307static int diff_opt_unified(const struct option *opt,
5308 const char *arg, int unset)
5309{
5310 struct diff_options *options = opt->value;
5311 char *s;
5312
5313 BUG_ON_OPT_NEG(unset);
5314
8ef05193
NTND
5315 if (arg) {
5316 options->context = strtol(arg, &s, 10);
5317 if (*s)
5318 return error(_("%s expects a numerical value"), "--unified");
5319 }
d473e2e0
NTND
5320 enable_patch_output(&options->output_format);
5321
5322 return 0;
5323}
5324
e9fb39b6
NTND
5325static int diff_opt_word_diff(const struct option *opt,
5326 const char *arg, int unset)
5327{
5328 struct diff_options *options = opt->value;
5329
5330 BUG_ON_OPT_NEG(unset);
5331 if (arg) {
5332 if (!strcmp(arg, "plain"))
5333 options->word_diff = DIFF_WORDS_PLAIN;
5334 else if (!strcmp(arg, "color")) {
5335 options->use_color = 1;
5336 options->word_diff = DIFF_WORDS_COLOR;
5337 }
5338 else if (!strcmp(arg, "porcelain"))
5339 options->word_diff = DIFF_WORDS_PORCELAIN;
5340 else if (!strcmp(arg, "none"))
5341 options->word_diff = DIFF_WORDS_NONE;
5342 else
5343 return error(_("bad --word-diff argument: %s"), arg);
5344 } else {
5345 if (options->word_diff == DIFF_WORDS_NONE)
5346 options->word_diff = DIFF_WORDS_PLAIN;
5347 }
5348 return 0;
5349}
5350
797df119
NTND
5351static int diff_opt_word_diff_regex(const struct option *opt,
5352 const char *arg, int unset)
5353{
5354 struct diff_options *options = opt->value;
5355
5356 BUG_ON_OPT_NEG(unset);
5357 if (options->word_diff == DIFF_WORDS_NONE)
5358 options->word_diff = DIFF_WORDS_PLAIN;
5359 options->word_regex = arg;
5360 return 0;
5361}
5362
1eb4136a
JH
5363static int diff_opt_rotate_to(const struct option *opt, const char *arg, int unset)
5364{
5365 struct diff_options *options = opt->value;
5366
5367 BUG_ON_OPT_NEG(unset);
5368 if (!strcmp(opt->long_name, "skip-to"))
5369 options->skip_instead_of_rotate = 1;
5370 else
5371 options->skip_instead_of_rotate = 0;
5372 options->rotate_to = arg;
5373 return 0;
5374}
5375
4a288478
NTND
5376static void prep_parse_options(struct diff_options *options)
5377{
5378 struct option parseopts[] = {
cc013c22
NTND
5379 OPT_GROUP(N_("Diff output format options")),
5380 OPT_BITOP('p', "patch", &options->output_format,
5381 N_("generate patch"),
5382 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
e01df7a3
NTND
5383 OPT_BIT_F('s', "no-patch", &options->output_format,
5384 N_("suppress diff output"),
5385 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
cc013c22
NTND
5386 OPT_BITOP('u', NULL, &options->output_format,
5387 N_("generate patch"),
5388 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
d473e2e0
NTND
5389 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
5390 N_("generate diffs with <n> lines context"),
8ef05193 5391 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
7fd9a1ba
NTND
5392 OPT_BOOL('W', "function-context", &options->flags.funccontext,
5393 N_("generate diffs with <n> lines context")),
ed881486
NTND
5394 OPT_BIT_F(0, "raw", &options->output_format,
5395 N_("generate the diff in raw format"),
5396 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
c659f303
NTND
5397 OPT_BITOP(0, "patch-with-raw", &options->output_format,
5398 N_("synonym for '-p --raw'"),
5399 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
5400 DIFF_FORMAT_NO_OUTPUT),
e550f585
NTND
5401 OPT_BITOP(0, "patch-with-stat", &options->output_format,
5402 N_("synonym for '-p --stat'"),
5403 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
5404 DIFF_FORMAT_NO_OUTPUT),
e5673620
NTND
5405 OPT_BIT_F(0, "numstat", &options->output_format,
5406 N_("machine friendly --stat"),
5407 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
5408 OPT_BIT_F(0, "shortstat", &options->output_format,
5409 N_("output only the last line of --stat"),
5410 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
4ce7aab5
NTND
5411 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
5412 N_("output the distribution of relative amount of changes for each sub-directory"),
5413 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5414 diff_opt_dirstat),
5415 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5416 N_("synonym for --dirstat=cumulative"),
5417 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5418 diff_opt_dirstat),
5419 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5420 N_("synonym for --dirstat=files,param1,param2..."),
5421 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5422 diff_opt_dirstat),
fc6af3e9
NTND
5423 OPT_BIT_F(0, "check", &options->output_format,
5424 N_("warn if changes introduce conflict markers or whitespace errors"),
5425 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
70a30417
NTND
5426 OPT_BIT_F(0, "summary", &options->output_format,
5427 N_("condensed summary such as creations, renames and mode changes"),
5428 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
0e840e2a
NTND
5429 OPT_BIT_F(0, "name-only", &options->output_format,
5430 N_("show only names of changed files"),
5431 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
a2387472
NTND
5432 OPT_BIT_F(0, "name-status", &options->output_format,
5433 N_("show only names and status of changed files"),
5434 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
84b5089e
NTND
5435 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5436 N_("generate diffstat"),
5437 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5438 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5439 N_("generate diffstat with a given width"),
5440 PARSE_OPT_NONEG, diff_opt_stat),
5441 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5442 N_("generate diffstat with a given name width"),
5443 PARSE_OPT_NONEG, diff_opt_stat),
5444 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5445 N_("generate diffstat with a given graph width"),
5446 PARSE_OPT_NONEG, diff_opt_stat),
5447 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5448 N_("generate diffstat with limited lines"),
5449 PARSE_OPT_NONEG, diff_opt_stat),
7d7942b7
NTND
5450 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5451 N_("generate compact summary in diffstat"),
5452 PARSE_OPT_NOARG, diff_opt_compact_summary),
6d9af6f4
NTND
5453 OPT_CALLBACK_F(0, "binary", options, NULL,
5454 N_("output a binary diff that can be applied"),
5455 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
4fe01672
NTND
5456 OPT_BOOL(0, "full-index", &options->flags.full_index,
5457 N_("show full pre- and post-image object names on the \"index\" lines")),
8b81c26e
NTND
5458 OPT_COLOR_FLAG(0, "color", &options->use_color,
5459 N_("show colored diff")),
5a749d9f
NTND
5460 OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
5461 N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
5462 PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
1a1eb164
NTND
5463 OPT_SET_INT('z', NULL, &options->line_termination,
5464 N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
5465 0),
d8774183 5466 OPT__ABBREV(&options->abbrev),
31fba9d3
NTND
5467 OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
5468 N_("show the given source prefix instead of \"a/\""),
5469 PARSE_OPT_NONEG),
5470 OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
8a1569d6 5471 N_("show the given destination prefix instead of \"b/\""),
31fba9d3 5472 PARSE_OPT_NONEG),
2f81cf98
NTND
5473 OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
5474 N_("prepend an additional prefix to every line of output"),
5475 PARSE_OPT_NONEG, diff_opt_line_prefix),
11c659d8
NTND
5476 OPT_CALLBACK_F(0, "no-prefix", options, NULL,
5477 N_("do not show any source or destination prefix"),
5478 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
16ed6c97
NTND
5479 OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
5480 N_("show context between diff hunks up to the specified number of lines"),
5481 PARSE_OPT_NONEG),
af2f3680
NTND
5482 OPT_CALLBACK_F(0, "output-indicator-new",
5483 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5484 N_("<char>"),
5485 N_("specify the character to indicate a new line instead of '+'"),
5486 PARSE_OPT_NONEG, diff_opt_char),
5487 OPT_CALLBACK_F(0, "output-indicator-old",
5488 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5489 N_("<char>"),
5490 N_("specify the character to indicate an old line instead of '-'"),
5491 PARSE_OPT_NONEG, diff_opt_char),
5492 OPT_CALLBACK_F(0, "output-indicator-context",
5493 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5494 N_("<char>"),
5495 N_("specify the character to indicate a context instead of ' '"),
5496 PARSE_OPT_NONEG, diff_opt_char),
5497
ced4e179
NTND
5498 OPT_GROUP(N_("Diff rename options")),
5499 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5500 N_("break complete rewrite changes into pairs of delete and create"),
5501 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5502 diff_opt_break_rewrites),
f476308b
NTND
5503 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5504 N_("detect renames"),
5505 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5506 diff_opt_find_renames),
1e533296
NTND
5507 OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
5508 N_("omit the preimage for deletes"),
5509 1, PARSE_OPT_NONEG),
7f64850d
NTND
5510 OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
5511 N_("detect copies"),
5512 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5513 diff_opt_find_copies),
bdd4741b
NTND
5514 OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
5515 N_("use unmodified files as source to find copies")),
cdc43eb0
NTND
5516 OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
5517 N_("disable rename detection"),
5518 0, PARSE_OPT_NONEG),
5519 OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
5520 N_("use empty blobs as rename source")),
1e9250b5
NTND
5521 OPT_CALLBACK_F(0, "follow", options, NULL,
5522 N_("continue listing the history of a file beyond renames"),
5523 PARSE_OPT_NOARG, diff_opt_follow),
bffee749
NTND
5524 OPT_INTEGER('l', NULL, &options->rename_limit,
5525 N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
ced4e179 5526
2e75f922
NTND
5527 OPT_GROUP(N_("Diff algorithm options")),
5528 OPT_BIT(0, "minimal", &options->xdl_opts,
5529 N_("produce the smallest possible diff"),
5530 XDF_NEED_MINIMAL),
87649a16
NTND
5531 OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
5532 N_("ignore whitespace when comparing lines"),
5533 XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
5534 OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
5535 N_("ignore changes in amount of whitespace"),
5536 XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
5537 OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
5538 N_("ignore changes in whitespace at EOL"),
5539 XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
5540 OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
5541 N_("ignore carrier-return at the end of line"),
5542 XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
5543 OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
5544 N_("ignore changes whose lines are all blank"),
5545 XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
296d4a94
MK
5546 OPT_CALLBACK_F('I', "ignore-matching-lines", options, N_("<regex>"),
5547 N_("ignore changes whose all lines match <regex>"),
5548 0, diff_opt_ignore_regex),
06f77518
NTND
5549 OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
5550 N_("heuristic to shift diff hunk boundaries for easy reading"),
5551 XDF_INDENT_HEURISTIC),
31fd640e
NTND
5552 OPT_CALLBACK_F(0, "patience", options, NULL,
5553 N_("generate diff using the \"patience diff\" algorithm"),
5554 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5555 diff_opt_patience),
f1e68ef5
NTND
5556 OPT_BITOP(0, "histogram", &options->xdl_opts,
5557 N_("generate diff using the \"histogram diff\" algorithm"),
5558 XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
10f35b1c
NTND
5559 OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
5560 N_("choose a diff algorithm"),
5561 PARSE_OPT_NONEG, diff_opt_diff_algorithm),
df84a436
NTND
5562 OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
5563 N_("generate diff using the \"anchored diff\" algorithm"),
5564 PARSE_OPT_NONEG, diff_opt_anchored),
e9fb39b6
NTND
5565 OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
5566 N_("show word diff, using <mode> to delimit changed words"),
5567 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
797df119
NTND
5568 OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
5569 N_("use <regex> to decide what a word is"),
5570 PARSE_OPT_NONEG, diff_opt_word_diff_regex),
212db69d
NTND
5571 OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
5572 N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
5573 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
59311a98 5574 OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
8bcd8f4c 5575 N_("moved lines of code are colored differently"),
59311a98 5576 PARSE_OPT_OPTARG, diff_opt_color_moved),
8ce2020f
NTND
5577 OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
5578 N_("how white spaces are ignored in --color-moved"),
bb987290 5579 0, diff_opt_color_moved_ws),
2e75f922 5580
8bcd8f4c 5581 OPT_GROUP(N_("Other diff options")),
0b1c5b59
NTND
5582 OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
5583 N_("when run from subdir, exclude changes outside and show relative paths"),
c28ded83 5584 PARSE_OPT_OPTARG,
0b1c5b59 5585 diff_opt_relative),
c37d4c0a
NTND
5586 OPT_BOOL('a', "text", &options->flags.text,
5587 N_("treat all files as text")),
4f99f299
NTND
5588 OPT_BOOL('R', NULL, &options->flags.reverse_diff,
5589 N_("swap two inputs, reverse the diff")),
1086ea0c
NTND
5590 OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
5591 N_("exit with 1 if there were differences, 0 otherwise")),
9bbaf1ce
NTND
5592 OPT_BOOL(0, "quiet", &options->flags.quick,
5593 N_("disable all output of the program")),
0cda1003
NTND
5594 OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
5595 N_("allow an external diff helper to be executed")),
8ab76977
NTND
5596 OPT_CALLBACK_F(0, "textconv", options, NULL,
5597 N_("run external text conversion filters when comparing binary files"),
5598 PARSE_OPT_NOARG, diff_opt_textconv),
b680ee14
NTND
5599 OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
5600 N_("ignore changes to submodules in the diff generation"),
5601 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5602 diff_opt_ignore_submodules),
125dcea9
NTND
5603 OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
5604 N_("specify how differences in submodules are shown"),
5605 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5606 diff_opt_submodule),
96860e48
NTND
5607 OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
5608 N_("hide 'git add -N' entries from the index"),
5609 1, PARSE_OPT_NONEG),
5610 OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
5611 N_("treat 'git add -N' entries as real in the index"),
5612 0, PARSE_OPT_NONEG),
a41cfb32
NTND
5613 OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
5614 N_("look for differences that change the number of occurrences of the specified string"),
5615 0, diff_opt_pickaxe_string),
5616 OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
5617 N_("look for differences that change the number of occurrences of the specified regex"),
5618 0, diff_opt_pickaxe_regex),
85f8e889
NTND
5619 OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
5620 N_("show all changes in the changeset with -S or -G"),
5621 DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
5622 OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
5623 N_("treat <string> in -S as extended POSIX regular expression"),
5624 DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
f731814b
NTND
5625 OPT_FILENAME('O', NULL, &options->orderfile,
5626 N_("control the order in which files appear in the output")),
1eb4136a
JH
5627 OPT_CALLBACK_F(0, "rotate-to", options, N_("<path>"),
5628 N_("show the change in the specified path first"),
5629 PARSE_OPT_NONEG, diff_opt_rotate_to),
5630 OPT_CALLBACK_F(0, "skip-to", options, N_("<path>"),
5631 N_("skip the output to the specified path"),
5632 PARSE_OPT_NONEG, diff_opt_rotate_to),
a75f28cb
NTND
5633 OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
5634 N_("look for differences that change the number of occurrences of the specified object"),
5635 PARSE_OPT_NONEG, diff_opt_find_object),
d2d3f273
NTND
5636 OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
5637 N_("select files by diff type"),
5638 PARSE_OPT_NONEG, diff_opt_diff_filter),
af2f3680
NTND
5639 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5640 N_("Output to a specific file"),
5641 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5642
4a288478
NTND
5643 OPT_END()
5644 };
5645
5646 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5647 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5648}
5649
a97262c6
NTND
5650int diff_opt_parse(struct diff_options *options,
5651 const char **av, int ac, const char *prefix)
6973dcae 5652{
a97262c6
NTND
5653 if (!prefix)
5654 prefix = "";
5655
4a288478
NTND
5656 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5657 PARSE_OPT_KEEP_DASHDASH |
5658 PARSE_OPT_KEEP_UNKNOWN |
5659 PARSE_OPT_NO_INTERNAL_HELP |
5660 PARSE_OPT_ONE_SHOT |
5661 PARSE_OPT_STOP_AT_NON_OPTION);
5662
8ce2020f 5663 return ac;
6973dcae
JH
5664}
5665
10ae7526 5666int parse_rename_score(const char **cp_p)
6973dcae
JH
5667{
5668 unsigned long num, scale;
5669 int ch, dot;
5670 const char *cp = *cp_p;
5671
5672 num = 0;
5673 scale = 1;
5674 dot = 0;
eeefa7c9 5675 for (;;) {
6973dcae
JH
5676 ch = *cp;
5677 if ( !dot && ch == '.' ) {
5678 scale = 1;
5679 dot = 1;
5680 } else if ( ch == '%' ) {
5681 scale = dot ? scale*100 : 100;
5682 cp++; /* % is always at the end */
5683 break;
5684 } else if ( ch >= '0' && ch <= '9' ) {
5685 if ( scale < 100000 ) {
5686 scale *= 10;
5687 num = (num*10) + (ch-'0');
5688 }
5689 } else {
5690 break;
5691 }
5692 cp++;
5693 }
5694 *cp_p = cp;
5695
5696 /* user says num divided by scale and we say internally that
5697 * is MAX_SCORE * num / scale.
5698 */
dc49cd76 5699 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
5700}
5701
6973dcae
JH
5702struct diff_queue_struct diff_queued_diff;
5703
5704void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5705{
4c960a43 5706 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
6973dcae
JH
5707 queue->queue[queue->nr++] = dp;
5708}
5709
5710struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5711 struct diff_filespec *one,
5712 struct diff_filespec *two)
5713{
ef677686 5714 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
5715 dp->one = one;
5716 dp->two = two;
6973dcae
JH
5717 if (queue)
5718 diff_q(queue, dp);
5719 return dp;
5720}
5721
5722void diff_free_filepair(struct diff_filepair *p)
5723{
9fb88419
LT
5724 free_filespec(p->one);
5725 free_filespec(p->two);
6973dcae
JH
5726 free(p);
5727}
5728
d6cece51 5729const char *diff_aligned_abbrev(const struct object_id *oid, int len)
6973dcae
JH
5730{
5731 int abblen;
5732 const char *abbrev;
6973dcae 5733
7cb6ac1e 5734 /* Do we want all 40 hex characters? */
02afca1e 5735 if (len == the_hash_algo->hexsz)
d6cece51
JK
5736 return oid_to_hex(oid);
5737
7cb6ac1e 5738 /* An abbreviated value is fine, possibly followed by an ellipsis. */
4f03666a 5739 abbrev = diff_abbrev_oid(oid, len);
7cb6ac1e
AR
5740
5741 if (!print_sha1_ellipsis())
5742 return abbrev;
5743
6973dcae 5744 abblen = strlen(abbrev);
d709f1fb
JH
5745
5746 /*
7cb6ac1e 5747 * In well-behaved cases, where the abbreviated result is the
d709f1fb
JH
5748 * same as the requested length, append three dots after the
5749 * abbreviation (hence the whole logic is limited to the case
5750 * where abblen < 37); when the actual abbreviated result is a
5751 * bit longer than the requested length, we reduce the number
5752 * of dots so that they match the well-behaved ones. However,
5753 * if the actual abbreviation is longer than the requested
5754 * length by more than three, we give up on aligning, and add
5755 * three dots anyway, to indicate that the output is not the
5756 * full object name. Yes, this may be suboptimal, but this
5757 * appears only in "diff --raw --abbrev" output and it is not
5758 * worth the effort to change it now. Note that this would
5759 * likely to work fine when the automatic sizing of default
5760 * abbreviation length is used--we would be fed -1 in "len" in
5761 * that case, and will end up always appending three-dots, but
5762 * the automatic sizing is supposed to give abblen that ensures
5763 * uniqueness across all objects (statistically speaking).
5764 */
02afca1e 5765 if (abblen < the_hash_algo->hexsz - 3) {
dc01505f 5766 static char hex[GIT_MAX_HEXSZ + 1];
6973dcae 5767 if (len < abblen && abblen <= len + 2)
5096d490 5768 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
6973dcae 5769 else
5096d490 5770 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
6973dcae
JH
5771 return hex;
5772 }
d6cece51
JK
5773
5774 return oid_to_hex(oid);
6973dcae
JH
5775}
5776
663af342 5777static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 5778{
663af342
PH
5779 int line_termination = opt->line_termination;
5780 int inter_name_termination = line_termination ? '\t' : '\0';
6973dcae 5781
30997bb8 5782 fprintf(opt->file, "%s", diff_line_prefix(opt));
663af342 5783 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
c0c77734 5784 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
d6cece51 5785 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
a0d12c44 5786 fprintf(opt->file, "%s ",
d6cece51 5787 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
6973dcae 5788 }
663af342 5789 if (p->score) {
c0c77734
DB
5790 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5791 inter_name_termination);
663af342 5792 } else {
c0c77734 5793 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
6973dcae 5794 }
6973dcae 5795
cd676a51
JH
5796 if (p->status == DIFF_STATUS_COPIED ||
5797 p->status == DIFF_STATUS_RENAMED) {
5798 const char *name_a, *name_b;
5799 name_a = p->one->path;
5800 name_b = p->two->path;
5801 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734
DB
5802 write_name_quoted(name_a, opt->file, inter_name_termination);
5803 write_name_quoted(name_b, opt->file, line_termination);
663af342 5804 } else {
cd676a51
JH
5805 const char *name_a, *name_b;
5806 name_a = p->one->mode ? p->one->path : p->two->path;
5807 name_b = NULL;
5808 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 5809 write_name_quoted(name_a, opt->file, line_termination);
663af342 5810 }
6973dcae
JH
5811}
5812
5813int diff_unmodified_pair(struct diff_filepair *p)
5814{
5815 /* This function is written stricter than necessary to support
5816 * the currently implemented transformers, but the idea is to
5817 * let transformers to produce diff_filepairs any way they want,
5818 * and filter and clean them up here before producing the output.
5819 */
663af342 5820 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
5821
5822 if (DIFF_PAIR_UNMERGED(p))
5823 return 0; /* unmerged is interesting */
5824
6973dcae
JH
5825 /* deletion, addition, mode or type change
5826 * and rename are all interesting.
5827 */
5828 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5829 DIFF_PAIR_MODE_CHANGED(p) ||
5830 strcmp(one->path, two->path))
5831 return 0;
5832
5833 /* both are valid and point at the same path. that is, we are
5834 * dealing with a change.
5835 */
41c9560e 5836 if (one->oid_valid && two->oid_valid &&
4a7e27e9 5837 oideq(&one->oid, &two->oid) &&
85adbf2f 5838 !one->dirty_submodule && !two->dirty_submodule)
6973dcae 5839 return 1; /* no change */
41c9560e 5840 if (!one->oid_valid && !two->oid_valid)
6973dcae
JH
5841 return 1; /* both look at the same file on the filesystem. */
5842 return 0;
5843}
5844
5845static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5846{
5847 if (diff_unmodified_pair(p))
5848 return;
5849
5850 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5851 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5852 return; /* no tree diffs in patch format */
5853
5854 run_diff(p, o);
5855}
5856
5857static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5858 struct diffstat_t *diffstat)
5859{
5860 if (diff_unmodified_pair(p))
5861 return;
5862
5863 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5864 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
c3fced64 5865 return; /* no useful stat for tree diffs */
6973dcae
JH
5866
5867 run_diffstat(p, o, diffstat);
5868}
5869
88246898
JS
5870static void diff_flush_checkdiff(struct diff_filepair *p,
5871 struct diff_options *o)
5872{
5873 if (diff_unmodified_pair(p))
5874 return;
5875
5876 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5877 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
c3fced64 5878 return; /* nothing to check in tree diffs */
88246898
JS
5879
5880 run_checkdiff(p, o);
5881}
5882
6973dcae
JH
5883int diff_queue_is_empty(void)
5884{
5885 struct diff_queue_struct *q = &diff_queued_diff;
5886 int i;
5887 for (i = 0; i < q->nr; i++)
5888 if (!diff_unmodified_pair(q->queue[i]))
5889 return 0;
5890 return 1;
5891}
5892
5893#if DIFF_DEBUG
5894void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5895{
5896 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5897 x, one ? one : "",
5898 s->path,
5899 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5900 s->mode,
41c9560e 5901 s->oid_valid ? oid_to_hex(&s->oid) : "");
428d52a5 5902 fprintf(stderr, "queue[%d] %s size %lu\n",
6973dcae 5903 x, one ? one : "",
428d52a5 5904 s->size);
6973dcae
JH
5905}
5906
5907void diff_debug_filepair(const struct diff_filepair *p, int i)
5908{
5909 diff_debug_filespec(p->one, i, "one");
5910 diff_debug_filespec(p->two, i, "two");
64479711 5911 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
6973dcae 5912 p->score, p->status ? p->status : '?',
64479711 5913 p->one->rename_used, p->broken_pair);
6973dcae
JH
5914}
5915
5916void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5917{
5918 int i;
5919 if (msg)
5920 fprintf(stderr, "%s\n", msg);
5921 fprintf(stderr, "q->nr = %d\n", q->nr);
5922 for (i = 0; i < q->nr; i++) {
5923 struct diff_filepair *p = q->queue[i];
5924 diff_debug_filepair(p, i);
5925 }
5926}
5927#endif
5928
5929static void diff_resolve_rename_copy(void)
5930{
64479711
LT
5931 int i;
5932 struct diff_filepair *p;
6973dcae
JH
5933 struct diff_queue_struct *q = &diff_queued_diff;
5934
5935 diff_debug_queue("resolve-rename-copy", q);
5936
5937 for (i = 0; i < q->nr; i++) {
5938 p = q->queue[i];
5939 p->status = 0; /* undecided */
5940 if (DIFF_PAIR_UNMERGED(p))
5941 p->status = DIFF_STATUS_UNMERGED;
5942 else if (!DIFF_FILE_VALID(p->one))
5943 p->status = DIFF_STATUS_ADDED;
5944 else if (!DIFF_FILE_VALID(p->two))
5945 p->status = DIFF_STATUS_DELETED;
5946 else if (DIFF_PAIR_TYPE_CHANGED(p))
5947 p->status = DIFF_STATUS_TYPE_CHANGED;
5948
5949 /* from this point on, we are dealing with a pair
5950 * whose both sides are valid and of the same type, i.e.
5951 * either in-place edit or rename/copy edit.
5952 */
5953 else if (DIFF_PAIR_RENAME(p)) {
64479711
LT
5954 /*
5955 * A rename might have re-connected a broken
5956 * pair up, causing the pathnames to be the
5957 * same again. If so, that's not a rename at
5958 * all, just a modification..
5959 *
5960 * Otherwise, see if this source was used for
5961 * multiple renames, in which case we decrement
5962 * the count, and call it a copy.
6973dcae 5963 */
64479711
LT
5964 if (!strcmp(p->one->path, p->two->path))
5965 p->status = DIFF_STATUS_MODIFIED;
5966 else if (--p->one->rename_used > 0)
6973dcae 5967 p->status = DIFF_STATUS_COPIED;
64479711 5968 else
6973dcae
JH
5969 p->status = DIFF_STATUS_RENAMED;
5970 }
9001dc2a 5971 else if (!oideq(&p->one->oid, &p->two->oid) ||
d516c2d1 5972 p->one->mode != p->two->mode ||
85adbf2f
JL
5973 p->one->dirty_submodule ||
5974 p->two->dirty_submodule ||
a0d12c44 5975 is_null_oid(&p->one->oid))
6973dcae
JH
5976 p->status = DIFF_STATUS_MODIFIED;
5977 else {
5978 /* This is a "no-change" entry and should not
5979 * happen anymore, but prepare for broken callers.
5980 */
5981 error("feeding unmodified %s to diffcore",
5982 p->one->path);
5983 p->status = DIFF_STATUS_UNKNOWN;
5984 }
5985 }
5986 diff_debug_queue("resolve-rename-copy done", q);
5987}
5988
c6744349 5989static int check_pair_status(struct diff_filepair *p)
6973dcae 5990{
6973dcae
JH
5991 switch (p->status) {
5992 case DIFF_STATUS_UNKNOWN:
c6744349 5993 return 0;
6973dcae
JH
5994 case 0:
5995 die("internal error in diff-resolve-rename-copy");
6973dcae 5996 default:
c6744349 5997 return 1;
6973dcae
JH
5998 }
5999}
6000
c6744349
TH
6001static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
6002{
6003 int fmt = opt->output_format;
6004
6005 if (fmt & DIFF_FORMAT_CHECKDIFF)
6006 diff_flush_checkdiff(p, opt);
6007 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
6008 diff_flush_raw(p, opt);
cd676a51
JH
6009 else if (fmt & DIFF_FORMAT_NAME) {
6010 const char *name_a, *name_b;
6011 name_a = p->two->path;
6012 name_b = NULL;
6013 strip_prefix(opt->prefix_length, &name_a, &name_b);
f5022b5f 6014 fprintf(opt->file, "%s", diff_line_prefix(opt));
c0c77734 6015 write_name_quoted(name_a, opt->file, opt->line_termination);
cd676a51 6016 }
c6744349
TH
6017}
6018
146fdb0d 6019static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
4bbd261b 6020{
146fdb0d 6021 struct strbuf sb = STRBUF_INIT;
4bbd261b 6022 if (fs->mode)
146fdb0d 6023 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
4bbd261b 6024 else
146fdb0d 6025 strbuf_addf(&sb, " %s ", newdelete);
4bbd261b 6026
146fdb0d
SB
6027 quote_c_style(fs->path, &sb, NULL, 0);
6028 strbuf_addch(&sb, '\n');
6029 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6030 sb.buf, sb.len, 0);
6031 strbuf_release(&sb);
6032}
4bbd261b 6033
146fdb0d
SB
6034static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
6035 int show_name)
4bbd261b
SE
6036{
6037 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
146fdb0d
SB
6038 struct strbuf sb = STRBUF_INIT;
6039 strbuf_addf(&sb, " mode change %06o => %06o",
6040 p->one->mode, p->two->mode);
0d26a64e 6041 if (show_name) {
146fdb0d
SB
6042 strbuf_addch(&sb, ' ');
6043 quote_c_style(p->two->path, &sb, NULL, 0);
0d26a64e 6044 }
58aaced4 6045 strbuf_addch(&sb, '\n');
146fdb0d
SB
6046 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6047 sb.buf, sb.len, 0);
6048 strbuf_release(&sb);
4bbd261b
SE
6049 }
6050}
6051
146fdb0d
SB
6052static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
6053 struct diff_filepair *p)
4bbd261b 6054{
146fdb0d 6055 struct strbuf sb = STRBUF_INIT;
c905cbc4
NTND
6056 struct strbuf names = STRBUF_INIT;
6057
6058 pprint_rename(&names, p->one->path, p->two->path);
146fdb0d 6059 strbuf_addf(&sb, " %s %s (%d%%)\n",
c905cbc4
NTND
6060 renamecopy, names.buf, similarity_index(p));
6061 strbuf_release(&names);
146fdb0d
SB
6062 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6063 sb.buf, sb.len, 0);
6064 show_mode_change(opt, p, 0);
348eda24 6065 strbuf_release(&sb);
4bbd261b
SE
6066}
6067
7be57610 6068static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4bbd261b
SE
6069{
6070 switch(p->status) {
6071 case DIFF_STATUS_DELETED:
146fdb0d 6072 show_file_mode_name(opt, "delete", p->one);
4bbd261b
SE
6073 break;
6074 case DIFF_STATUS_ADDED:
146fdb0d 6075 show_file_mode_name(opt, "create", p->two);
4bbd261b
SE
6076 break;
6077 case DIFF_STATUS_COPIED:
146fdb0d 6078 show_rename_copy(opt, "copy", p);
4bbd261b
SE
6079 break;
6080 case DIFF_STATUS_RENAMED:
146fdb0d 6081 show_rename_copy(opt, "rename", p);
4bbd261b
SE
6082 break;
6083 default:
6084 if (p->score) {
146fdb0d
SB
6085 struct strbuf sb = STRBUF_INIT;
6086 strbuf_addstr(&sb, " rewrite ");
6087 quote_c_style(p->two->path, &sb, NULL, 0);
6088 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
6089 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6090 sb.buf, sb.len, 0);
fa842d84 6091 strbuf_release(&sb);
663af342 6092 }
146fdb0d 6093 show_mode_change(opt, p, !p->score);
4bbd261b
SE
6094 break;
6095 }
6096}
6097
fcb3d0ad 6098struct patch_id_t {
36261e42 6099 git_hash_ctx *ctx;
fcb3d0ad
JS
6100 int patchlen;
6101};
6102
6103static int remove_space(char *line, int len)
6104{
6105 int i;
663af342
PH
6106 char *dst = line;
6107 unsigned char c;
fcb3d0ad 6108
663af342
PH
6109 for (i = 0; i < len; i++)
6110 if (!isspace((c = line[i])))
6111 *dst++ = c;
fcb3d0ad 6112
663af342 6113 return dst - line;
fcb3d0ad
JS
6114}
6115
36261e42 6116void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
a8f6855f
SB
6117{
6118 unsigned char hash[GIT_MAX_RAWSZ];
6119 unsigned short carry = 0;
6120 int i;
6121
36261e42 6122 the_hash_algo->final_fn(hash, ctx);
6123 the_hash_algo->init_fn(ctx);
a8f6855f 6124 /* 20-byte sum, with carry */
36261e42 6125 for (i = 0; i < the_hash_algo->rawsz; ++i) {
a8f6855f
SB
6126 carry += result->hash[i] + hash[i];
6127 result->hash[i] = carry;
6128 carry >>= 8;
6129 }
6130}
6131
a8d5eb6d 6132static int patch_id_consume(void *priv, char *line, unsigned long len)
fcb3d0ad
JS
6133{
6134 struct patch_id_t *data = priv;
6135 int new_len;
6136
82a62015 6137 if (len > 12 && starts_with(line, "\\ "))
a8d5eb6d 6138 return 0;
fcb3d0ad
JS
6139 new_len = remove_space(line, len);
6140
36261e42 6141 the_hash_algo->update_fn(data->ctx, line, new_len);
fcb3d0ad 6142 data->patchlen += new_len;
a8d5eb6d 6143 return 0;
fcb3d0ad
JS
6144}
6145
36261e42 6146static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
977db6b4 6147{
36261e42 6148 the_hash_algo->update_fn(ctx, str, strlen(str));
977db6b4
JK
6149}
6150
36261e42 6151static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
977db6b4
JK
6152{
6153 /* large enough for 2^32 in octal */
6154 char buf[12];
6155 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
36261e42 6156 the_hash_algo->update_fn(ctx, buf, len);
977db6b4
JK
6157}
6158
a8f6855f
SB
6159/* returns 0 upon success, and writes result into oid */
6160static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
fcb3d0ad
JS
6161{
6162 struct diff_queue_struct *q = &diff_queued_diff;
6163 int i;
36261e42 6164 git_hash_ctx ctx;
fcb3d0ad 6165 struct patch_id_t data;
fcb3d0ad 6166
36261e42 6167 the_hash_algo->init_fn(&ctx);
fcb3d0ad
JS
6168 memset(&data, 0, sizeof(struct patch_id_t));
6169 data.ctx = &ctx;
a8f6855f 6170 oidclr(oid);
fcb3d0ad
JS
6171
6172 for (i = 0; i < q->nr; i++) {
6173 xpparam_t xpp;
6174 xdemitconf_t xecfg;
fcb3d0ad
JS
6175 mmfile_t mf1, mf2;
6176 struct diff_filepair *p = q->queue[i];
6177 int len1, len2;
6178
9ccd0a88 6179 memset(&xpp, 0, sizeof(xpp));
30b25010 6180 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
6181 if (p->status == 0)
6182 return error("internal diff status error");
6183 if (p->status == DIFF_STATUS_UNKNOWN)
6184 continue;
6185 if (diff_unmodified_pair(p))
6186 continue;
6187 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
6188 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
6189 continue;
6190 if (DIFF_PAIR_UNMERGED(p))
6191 continue;
6192
58bf2a4c
NTND
6193 diff_fill_oid_info(p->one, options->repo->index);
6194 diff_fill_oid_info(p->two, options->repo->index);
fcb3d0ad 6195
fcb3d0ad
JS
6196 len1 = remove_space(p->one->path, strlen(p->one->path));
6197 len2 = remove_space(p->two->path, strlen(p->two->path));
977db6b4
JK
6198 patch_id_add_string(&ctx, "diff--git");
6199 patch_id_add_string(&ctx, "a/");
36261e42 6200 the_hash_algo->update_fn(&ctx, p->one->path, len1);
977db6b4 6201 patch_id_add_string(&ctx, "b/");
36261e42 6202 the_hash_algo->update_fn(&ctx, p->two->path, len2);
977db6b4
JK
6203
6204 if (p->one->mode == 0) {
6205 patch_id_add_string(&ctx, "newfilemode");
6206 patch_id_add_mode(&ctx, p->two->mode);
6207 patch_id_add_string(&ctx, "---/dev/null");
6208 patch_id_add_string(&ctx, "+++b/");
36261e42 6209 the_hash_algo->update_fn(&ctx, p->two->path, len2);
977db6b4
JK
6210 } else if (p->two->mode == 0) {
6211 patch_id_add_string(&ctx, "deletedfilemode");
6212 patch_id_add_mode(&ctx, p->one->mode);
6213 patch_id_add_string(&ctx, "---a/");
36261e42 6214 the_hash_algo->update_fn(&ctx, p->one->path, len1);
977db6b4
JK
6215 patch_id_add_string(&ctx, "+++/dev/null");
6216 } else {
6217 patch_id_add_string(&ctx, "---a/");
36261e42 6218 the_hash_algo->update_fn(&ctx, p->one->path, len1);
977db6b4 6219 patch_id_add_string(&ctx, "+++b/");
36261e42 6220 the_hash_algo->update_fn(&ctx, p->two->path, len2);
977db6b4 6221 }
fcb3d0ad 6222
3e8e32c3
KW
6223 if (diff_header_only)
6224 continue;
6225
b78ea5fc
NTND
6226 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
6227 fill_mmfile(options->repo, &mf2, p->two) < 0)
3e8e32c3
KW
6228 return error("unable to read files to diff");
6229
b78ea5fc
NTND
6230 if (diff_filespec_is_binary(options->repo, p->one) ||
6231 diff_filespec_is_binary(options->repo, p->two)) {
36261e42 6232 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
6233 the_hash_algo->hexsz);
6234 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
6235 the_hash_algo->hexsz);
34597c1f
CB
6236 continue;
6237 }
6238
582aa00b 6239 xpp.flags = 0;
fcb3d0ad 6240 xecfg.ctxlen = 3;
5d934600
ÆAB
6241 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
6242 if (xdi_diff_outf(&mf1, &mf2, NULL,
b1357391 6243 patch_id_consume, &data, &xpp, &xecfg))
3efb9880
JK
6244 return error("unable to generate patch-id diff for %s",
6245 p->one->path);
a8f6855f
SB
6246
6247 if (stable)
6248 flush_one_hunk(oid, &ctx);
fcb3d0ad
JS
6249 }
6250
a8f6855f 6251 if (!stable)
5951bf46 6252 the_hash_algo->final_oid_fn(oid, &ctx);
a8f6855f 6253
fcb3d0ad
JS
6254 return 0;
6255}
6256
a8f6855f 6257int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
fcb3d0ad
JS
6258{
6259 struct diff_queue_struct *q = &diff_queued_diff;
6260 int i;
a8f6855f 6261 int result = diff_get_patch_id(options, oid, diff_header_only, stable);
fcb3d0ad
JS
6262
6263 for (i = 0; i < q->nr; i++)
6264 diff_free_filepair(q->queue[i]);
6265
6266 free(q->queue);
9ca5df90 6267 DIFF_QUEUE_CLEAR(q);
fcb3d0ad
JS
6268
6269 return result;
6270}
6271
946c3784 6272static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 6273{
6973dcae 6274 int i;
6973dcae 6275
946c3784
TH
6276 for (i = 0; i < q->nr; i++) {
6277 const struct diff_filepair *p = q->queue[i];
6278
6279 switch (p->status) {
6280 case DIFF_STATUS_DELETED:
6281 case DIFF_STATUS_ADDED:
6282 case DIFF_STATUS_COPIED:
6283 case DIFF_STATUS_RENAMED:
6284 return 0;
6285 default:
6286 if (p->score)
6287 return 0;
6288 if (p->one->mode && p->two->mode &&
6289 p->one->mode != p->two->mode)
6290 return 0;
6291 break;
6292 }
6973dcae 6293 }
946c3784
TH
6294 return 1;
6295}
6296
f31027c9 6297static const char rename_limit_warning[] =
05d2c61c 6298N_("exhaustive rename detection was skipped due to too many files.");
f31027c9
JH
6299
6300static const char degrade_cc_to_c_warning[] =
db424979 6301N_("only found copies from modified paths due to too many files.");
f31027c9
JH
6302
6303static const char rename_limit_advice[] =
db424979
VA
6304N_("you may want to set your %s variable to at least "
6305 "%d and retry the command.");
f31027c9
JH
6306
6307void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
6308{
4e056c98 6309 fflush(stdout);
f31027c9 6310 if (degraded_cc)
db424979 6311 warning(_(degrade_cc_to_c_warning));
f31027c9 6312 else if (needed)
db424979 6313 warning(_(rename_limit_warning));
f31027c9
JH
6314 else
6315 return;
9f7e4bfa 6316 if (0 < needed)
db424979 6317 warning(_(rename_limit_advice), varname, needed);
f31027c9
JH
6318}
6319
ec331506
SB
6320static void diff_flush_patch_all_file_pairs(struct diff_options *o)
6321{
6322 int i;
e6e045f8 6323 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
ec331506 6324 struct diff_queue_struct *q = &diff_queued_diff;
091f8e28
SB
6325
6326 if (WSEH_NEW & WS_RULE_MASK)
033abf97 6327 BUG("WS rules bit mask overlaps with diff symbol flags");
091f8e28 6328
2e2d5ac1
SB
6329 if (o->color_moved)
6330 o->emitted_symbols = &esm;
e6e045f8 6331
ec331506
SB
6332 for (i = 0; i < q->nr; i++) {
6333 struct diff_filepair *p = q->queue[i];
6334 if (check_pair_status(p))
6335 diff_flush_patch(p, o);
6336 }
e6e045f8
SB
6337
6338 if (o->emitted_symbols) {
2e2d5ac1
SB
6339 if (o->color_moved) {
6340 struct hashmap add_lines, del_lines;
6341
ca1f4ae4
SB
6342 if (o->color_moved_ws_handling &
6343 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
6344 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
6345
ee1df66f
SB
6346 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
6347 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
2e2d5ac1
SB
6348
6349 add_lines_to_move_detection(o, &add_lines, &del_lines);
6350 mark_color_as_moved(o, &add_lines, &del_lines);
86b452e2
SB
6351 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6352 dim_moved_lines(o);
2e2d5ac1 6353
6da1a258 6354 hashmap_clear_and_free(&add_lines, struct moved_entry,
c8e424c9 6355 ent);
6da1a258 6356 hashmap_clear_and_free(&del_lines, struct moved_entry,
c8e424c9 6357 ent);
2e2d5ac1
SB
6358 }
6359
e6e045f8
SB
6360 for (i = 0; i < esm.nr; i++)
6361 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6362
6363 for (i = 0; i < esm.nr; i++)
6364 free((void *)esm.buf[i].line);
48edf3a0
JK
6365 esm.nr = 0;
6366
6367 o->emitted_symbols = NULL;
e6e045f8 6368 }
ec331506
SB
6369}
6370
e900d494
ÆAB
6371static void diff_free_file(struct diff_options *options)
6372{
6373 if (options->close_file)
6374 fclose(options->file);
6375}
6376
c45dc9cf
ÆAB
6377static void diff_free_ignore_regex(struct diff_options *options)
6378{
6379 int i;
6380
6381 for (i = 0; i < options->ignore_regex_nr; i++) {
6382 regfree(options->ignore_regex[i]);
6383 free(options->ignore_regex[i]);
6384 }
6385 free(options->ignore_regex);
6386}
6387
e900d494
ÆAB
6388void diff_free(struct diff_options *options)
6389{
6390 if (options->no_free)
6391 return;
6392
6393 diff_free_file(options);
c45dc9cf 6394 diff_free_ignore_regex(options);
e900d494
ÆAB
6395}
6396
6973dcae
JH
6397void diff_flush(struct diff_options *options)
6398{
6399 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 6400 int i, output_format = options->output_format;
946c3784 6401 int separator = 0;
1c57a627 6402 int dirstat_by_line = 0;
6973dcae 6403
c6744349
TH
6404 /*
6405 * Order: raw, stat, summary, patch
6406 * or: name/name-status/checkdiff (other bits clear)
6407 */
946c3784
TH
6408 if (!q->nr)
6409 goto free_queue;
6973dcae 6410
c6744349
TH
6411 if (output_format & (DIFF_FORMAT_RAW |
6412 DIFF_FORMAT_NAME |
6413 DIFF_FORMAT_NAME_STATUS |
6414 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
6415 for (i = 0; i < q->nr; i++) {
6416 struct diff_filepair *p = q->queue[i];
c6744349
TH
6417 if (check_pair_status(p))
6418 flush_one_pair(p, options);
6973dcae 6419 }
946c3784 6420 separator++;
6973dcae 6421 }
c6744349 6422
0d1e0e78 6423 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
1c57a627
JH
6424 dirstat_by_line = 1;
6425
6426 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6427 dirstat_by_line) {
5e2b0636 6428 struct diffstat_t diffstat;
c6744349 6429
e4cb659e 6430 compute_diffstat(options, &diffstat, q);
74e2abe5
JH
6431 if (output_format & DIFF_FORMAT_NUMSTAT)
6432 show_numstat(&diffstat, options);
6433 if (output_format & DIFF_FORMAT_DIFFSTAT)
6434 show_stats(&diffstat, options);
f604652e 6435 if (output_format & DIFF_FORMAT_SHORTSTAT)
c0c77734 6436 show_shortstats(&diffstat, options);
ab27389a 6437 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
1c57a627 6438 show_dirstat_by_line(&diffstat, options);
f604652e 6439 free_diffstat_info(&diffstat);
3969cf7d 6440 separator++;
6973dcae 6441 }
1c57a627 6442 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
c04a7155 6443 show_dirstat(options);
6973dcae 6444
946c3784 6445 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
7be57610
BY
6446 for (i = 0; i < q->nr; i++) {
6447 diff_summary(options, q->queue[i]);
6448 }
3969cf7d 6449 separator++;
6973dcae
JH
6450 }
6451
6977c250 6452 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
0d1e0e78
BW
6453 options->flags.exit_with_status &&
6454 options->flags.diff_from_contents) {
6977c250
LA
6455 /*
6456 * run diff_flush_patch for the exit status. setting
749f763d 6457 * options->file to /dev/null should be safe, because we
6977c250
LA
6458 * aren't supposed to produce any output anyway.
6459 */
e900d494 6460 diff_free_file(options);
23a9e071 6461 options->file = xfopen("/dev/null", "w");
6977c250 6462 options->close_file = 1;
2e2d5ac1 6463 options->color_moved = 0;
6977c250
LA
6464 for (i = 0; i < q->nr; i++) {
6465 struct diff_filepair *p = q->queue[i];
6466 if (check_pair_status(p))
6467 diff_flush_patch(p, options);
6468 if (options->found_changes)
6469 break;
6470 }
6471 }
6472
c6744349 6473 if (output_format & DIFF_FORMAT_PATCH) {
946c3784 6474 if (separator) {
091f8e28 6475 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
30b7e1e7 6476 if (options->stat_sep)
946c3784 6477 /* attach patch instead of inline */
30b7e1e7
SB
6478 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6479 NULL, 0, 0);
c6744349
TH
6480 }
6481
ec331506 6482 diff_flush_patch_all_file_pairs(options);
4bbd261b
SE
6483 }
6484
04245581
JK
6485 if (output_format & DIFF_FORMAT_CALLBACK)
6486 options->format_callback(q, options, options->format_callback_data);
6487
c6744349
TH
6488 for (i = 0; i < q->nr; i++)
6489 diff_free_filepair(q->queue[i]);
946c3784 6490free_queue:
6973dcae 6491 free(q->queue);
9ca5df90 6492 DIFF_QUEUE_CLEAR(q);
e900d494 6493 diff_free(options);
f245194f
JH
6494
6495 /*
97bf2a08 6496 * Report the content-level differences with HAS_CHANGES;
f245194f
JH
6497 * diff_addremove/diff_change does not set the bit when
6498 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6499 */
0d1e0e78 6500 if (options->flags.diff_from_contents) {
f245194f 6501 if (options->found_changes)
0d1e0e78 6502 options->flags.has_changes = 1;
f245194f 6503 else
0d1e0e78 6504 options->flags.has_changes = 0;
f245194f 6505 }
6973dcae
JH
6506}
6507
08578fa1
JH
6508static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6509{
6510 return (((p->status == DIFF_STATUS_MODIFIED) &&
6511 ((p->score &&
1ecc1cbd 6512 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
08578fa1 6513 (!p->score &&
1ecc1cbd 6514 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
08578fa1 6515 ((p->status != DIFF_STATUS_MODIFIED) &&
1ecc1cbd 6516 filter_bit_tst(p->status, options)));
08578fa1
JH
6517}
6518
949226fe 6519static void diffcore_apply_filter(struct diff_options *options)
6973dcae
JH
6520{
6521 int i;
6522 struct diff_queue_struct *q = &diff_queued_diff;
6523 struct diff_queue_struct outq;
949226fe 6524
9ca5df90 6525 DIFF_QUEUE_CLEAR(&outq);
6973dcae 6526
1ecc1cbd 6527 if (!options->filter)
6973dcae
JH
6528 return;
6529
1ecc1cbd 6530 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6973dcae
JH
6531 int found;
6532 for (i = found = 0; !found && i < q->nr; i++) {
08578fa1 6533 if (match_filter(options, q->queue[i]))
6973dcae
JH
6534 found++;
6535 }
6536 if (found)
6537 return;
6538
6539 /* otherwise we will clear the whole queue
6540 * by copying the empty outq at the end of this
6541 * function, but first clear the current entries
6542 * in the queue.
6543 */
6544 for (i = 0; i < q->nr; i++)
6545 diff_free_filepair(q->queue[i]);
6546 }
6547 else {
6548 /* Only the matching ones */
6549 for (i = 0; i < q->nr; i++) {
6550 struct diff_filepair *p = q->queue[i];
08578fa1 6551 if (match_filter(options, p))
6973dcae
JH
6552 diff_q(&outq, p);
6553 else
6554 diff_free_filepair(p);
6555 }
6556 }
6557 free(q->queue);
6558 *q = outq;
6559}
6560
5701115a 6561/* Check whether two filespecs with the same mode and size are identical */
b78ea5fc
NTND
6562static int diff_filespec_is_identical(struct repository *r,
6563 struct diff_filespec *one,
5701115a
SV
6564 struct diff_filespec *two)
6565{
2b459b48
JH
6566 if (S_ISGITLINK(one->mode))
6567 return 0;
1c37e86a 6568 if (diff_populate_filespec(r, one, NULL))
5701115a 6569 return 0;
1c37e86a 6570 if (diff_populate_filespec(r, two, NULL))
5701115a
SV
6571 return 0;
6572 return !memcmp(one->data, two->data, one->size);
6573}
6574
b78ea5fc
NTND
6575static int diff_filespec_check_stat_unmatch(struct repository *r,
6576 struct diff_filepair *p)
fceb9072 6577{
1c37e86a
JT
6578 struct diff_populate_filespec_options dpf_options = {
6579 .check_size_only = 1,
95acf11a
JT
6580 .missing_object_cb = diff_queued_diff_prefetch,
6581 .missing_object_data = r,
1c37e86a
JT
6582 };
6583
f34b205f
NTND
6584 if (p->done_skip_stat_unmatch)
6585 return p->skip_stat_unmatch_result;
6586
6587 p->done_skip_stat_unmatch = 1;
6588 p->skip_stat_unmatch_result = 0;
fceb9072
NTND
6589 /*
6590 * 1. Entries that come from stat info dirtiness
6591 * always have both sides (iow, not create/delete),
6592 * one side of the object name is unknown, with
6593 * the same mode and size. Keep the ones that
6594 * do not match these criteria. They have real
6595 * differences.
6596 *
6597 * 2. At this point, the file is known to be modified,
6598 * with the same mode and size, and the object
6599 * name of one side is unknown. Need to inspect
6600 * the identical contents.
6601 */
6602 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6603 !DIFF_FILE_VALID(p->two) ||
41c9560e 6604 (p->one->oid_valid && p->two->oid_valid) ||
fceb9072 6605 (p->one->mode != p->two->mode) ||
1c37e86a
JT
6606 diff_populate_filespec(r, p->one, &dpf_options) ||
6607 diff_populate_filespec(r, p->two, &dpf_options) ||
fceb9072 6608 (p->one->size != p->two->size) ||
b78ea5fc 6609 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
f34b205f
NTND
6610 p->skip_stat_unmatch_result = 1;
6611 return p->skip_stat_unmatch_result;
fceb9072
NTND
6612}
6613
fb13227e
JH
6614static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6615{
6616 int i;
6617 struct diff_queue_struct *q = &diff_queued_diff;
6618 struct diff_queue_struct outq;
9ca5df90 6619 DIFF_QUEUE_CLEAR(&outq);
fb13227e
JH
6620
6621 for (i = 0; i < q->nr; i++) {
6622 struct diff_filepair *p = q->queue[i];
6623
b78ea5fc 6624 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
fb13227e
JH
6625 diff_q(&outq, p);
6626 else {
6627 /*
6628 * The caller can subtract 1 from skip_stat_unmatch
6629 * to determine how many paths were dirty only
6630 * due to stat info mismatch.
6631 */
0d1e0e78 6632 if (!diffopt->flags.no_index)
6d2d9e86 6633 diffopt->skip_stat_unmatch++;
fb13227e
JH
6634 diff_free_filepair(p);
6635 }
6636 }
6637 free(q->queue);
6638 *q = outq;
6639}
6640
730f7284
JH
6641static int diffnamecmp(const void *a_, const void *b_)
6642{
6643 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6644 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6645 const char *name_a, *name_b;
6646
6647 name_a = a->one ? a->one->path : a->two->path;
6648 name_b = b->one ? b->one->path : b->two->path;
6649 return strcmp(name_a, name_b);
6650}
6651
784c0dae 6652void diffcore_fix_diff_index(void)
730f7284
JH
6653{
6654 struct diff_queue_struct *q = &diff_queued_diff;
9ed0d8d6 6655 QSORT(q->queue, q->nr, diffnamecmp);
730f7284
JH
6656}
6657
95acf11a
JT
6658void diff_add_if_missing(struct repository *r,
6659 struct oid_array *to_fetch,
6660 const struct diff_filespec *filespec)
7fbbcb21
JT
6661{
6662 if (filespec && filespec->oid_valid &&
a63694f5 6663 !S_ISGITLINK(filespec->mode) &&
7fbbcb21
JT
6664 oid_object_info_extended(r, &filespec->oid, NULL,
6665 OBJECT_INFO_FOR_PREFETCH))
6666 oid_array_append(to_fetch, &filespec->oid);
6667}
6668
95acf11a 6669void diff_queued_diff_prefetch(void *repository)
6973dcae 6670{
95acf11a
JT
6671 struct repository *repo = repository;
6672 int i;
6673 struct diff_queue_struct *q = &diff_queued_diff;
6674 struct oid_array to_fetch = OID_ARRAY_INIT;
7fbbcb21 6675
95acf11a
JT
6676 for (i = 0; i < q->nr; i++) {
6677 struct diff_filepair *p = q->queue[i];
6678 diff_add_if_missing(repo, &to_fetch, p->one);
6679 diff_add_if_missing(repo, &to_fetch, p->two);
7fbbcb21
JT
6680 }
6681
95acf11a
JT
6682 /*
6683 * NEEDSWORK: Consider deduplicating the OIDs sent.
6684 */
6685 promisor_remote_get_direct(repo, to_fetch.oid, to_fetch.nr);
6686
6687 oid_array_clear(&to_fetch);
6688}
6689
6690void diffcore_std(struct diff_options *options)
6691{
6692 int output_formats_to_prefetch = DIFF_FORMAT_DIFFSTAT |
6693 DIFF_FORMAT_NUMSTAT |
6694 DIFF_FORMAT_PATCH |
6695 DIFF_FORMAT_SHORTSTAT |
6696 DIFF_FORMAT_DIRSTAT;
6697
6698 /*
6699 * Check if the user requested a blob-data-requiring diff output and/or
6700 * break-rewrite detection (which requires blob data). If yes, prefetch
6701 * the diff pairs.
6702 *
6703 * If no prefetching occurs, diffcore_rename() will prefetch if it
6704 * decides that it needs inexact rename detection.
6705 */
6706 if (options->repo == the_repository && has_promisor_remote() &&
6707 (options->output_format & output_formats_to_prefetch ||
6708 options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
6709 diff_queued_diff_prefetch(options->repo);
6710
7195fbfa 6711 /* NOTE please keep the following in sync with diff_tree_combined() */
9d865356 6712 if (options->skip_stat_unmatch)
fb13227e 6713 diffcore_skip_stat_unmatch(options);
44c48a90
JH
6714 if (!options->found_follow) {
6715 /* See try_to_follow_renames() in tree-diff.c */
6716 if (options->break_opt != -1)
b78ea5fc
NTND
6717 diffcore_break(options->repo,
6718 options->break_opt);
44c48a90
JH
6719 if (options->detect_rename)
6720 diffcore_rename(options);
6721 if (options->break_opt != -1)
6722 diffcore_merge_broken();
6723 }
cf63051a 6724 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
382f013b 6725 diffcore_pickaxe(options);
6973dcae
JH
6726 if (options->orderfile)
6727 diffcore_order(options->orderfile);
1eb4136a
JH
6728 if (options->rotate_to)
6729 diffcore_rotate(options);
44c48a90
JH
6730 if (!options->found_follow)
6731 /* See try_to_follow_renames() in tree-diff.c */
6732 diff_resolve_rename_copy();
949226fe 6733 diffcore_apply_filter(options);
68aacb2f 6734
0d1e0e78
BW
6735 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6736 options->flags.has_changes = 1;
8f67f8ae 6737 else
0d1e0e78 6738 options->flags.has_changes = 0;
1da6175d 6739
44c48a90 6740 options->found_follow = 0;
6973dcae
JH
6741}
6742
da31b358
JH
6743int diff_result_code(struct diff_options *opt, int status)
6744{
6745 int result = 0;
f31027c9 6746
c9fc4415 6747 diff_warn_rename_limit("diff.renameLimit",
f31027c9
JH
6748 opt->needed_rename_limit,
6749 opt->degraded_cc_to_c);
0d1e0e78 6750 if (!opt->flags.exit_with_status &&
da31b358
JH
6751 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6752 return status;
0d1e0e78
BW
6753 if (opt->flags.exit_with_status &&
6754 opt->flags.has_changes)
da31b358
JH
6755 result |= 01;
6756 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
0d1e0e78 6757 opt->flags.check_failed)
da31b358
JH
6758 result |= 02;
6759 return result;
6760}
6973dcae 6761
28b9264d
JH
6762int diff_can_quit_early(struct diff_options *opt)
6763{
0d1e0e78 6764 return (opt->flags.quick &&
28b9264d 6765 !opt->filter &&
0d1e0e78 6766 opt->flags.has_changes);
28b9264d
JH
6767}
6768
aee9c7d6
JL
6769/*
6770 * Shall changes to this submodule be ignored?
6771 *
6772 * Submodule changes can be configured to be ignored separately for each path,
6773 * but that configuration can be overridden from the command line.
6774 */
6775static int is_submodule_ignored(const char *path, struct diff_options *options)
6776{
6777 int ignored = 0;
02f2f56b 6778 struct diff_flags orig_flags = options->flags;
0d1e0e78 6779 if (!options->flags.override_submodule_config)
aee9c7d6 6780 set_diffopt_flags_from_submodule_config(options, path);
0d1e0e78 6781 if (options->flags.ignore_submodules)
aee9c7d6
JL
6782 ignored = 1;
6783 options->flags = orig_flags;
6784 return ignored;
6785}
6786
e4cb659e
DF
6787void compute_diffstat(struct diff_options *options,
6788 struct diffstat_t *diffstat,
6789 struct diff_queue_struct *q)
6790{
6791 int i;
6792
6793 memset(diffstat, 0, sizeof(struct diffstat_t));
6794 for (i = 0; i < q->nr; i++) {
6795 struct diff_filepair *p = q->queue[i];
6796 if (check_pair_status(p))
6797 diff_flush_stat(p, options, diffstat);
6798 }
6799}
6800
6973dcae
JH
6801void diff_addremove(struct diff_options *options,
6802 int addremove, unsigned mode,
c26022ea
BW
6803 const struct object_id *oid,
6804 int oid_valid,
e3d42c47 6805 const char *concatpath, unsigned dirty_submodule)
6973dcae 6806{
6973dcae
JH
6807 struct diff_filespec *one, *two;
6808
aee9c7d6 6809 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
50fd9bd8
JS
6810 return;
6811
6973dcae
JH
6812 /* This may look odd, but it is a preparation for
6813 * feeding "there are unchanged files which should
6814 * not produce diffs, but when you are doing copy
6815 * detection you would need them, so here they are"
6816 * entries to the diff-core. They will be prefixed
6817 * with something like '=' or '*' (I haven't decided
6818 * which but should not make any difference).
a6080a0a 6819 * Feeding the same new and old to diff_change()
6973dcae
JH
6820 * also has the same effect.
6821 * Before the final output happens, they are pruned after
6822 * merged into rename/copy pairs as appropriate.
6823 */
0d1e0e78 6824 if (options->flags.reverse_diff)
6973dcae
JH
6825 addremove = (addremove == '+' ? '-' :
6826 addremove == '-' ? '+' : addremove);
6827
cd676a51
JH
6828 if (options->prefix &&
6829 strncmp(concatpath, options->prefix, options->prefix_length))
6830 return;
6831
6973dcae
JH
6832 one = alloc_filespec(concatpath);
6833 two = alloc_filespec(concatpath);
6834
6835 if (addremove != '+')
f9704c2d 6836 fill_filespec(one, oid, oid_valid, mode);
e3d42c47 6837 if (addremove != '-') {
f9704c2d 6838 fill_filespec(two, oid, oid_valid, mode);
e3d42c47
JL
6839 two->dirty_submodule = dirty_submodule;
6840 }
6973dcae
JH
6841
6842 diff_queue(&diff_queued_diff, one, two);
0d1e0e78
BW
6843 if (!options->flags.diff_from_contents)
6844 options->flags.has_changes = 1;
6973dcae
JH
6845}
6846
6847void diff_change(struct diff_options *options,
6848 unsigned old_mode, unsigned new_mode,
94a0097a
BW
6849 const struct object_id *old_oid,
6850 const struct object_id *new_oid,
6851 int old_oid_valid, int new_oid_valid,
e3d42c47
JL
6852 const char *concatpath,
6853 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6973dcae 6854{
6973dcae 6855 struct diff_filespec *one, *two;
f34b205f 6856 struct diff_filepair *p;
6973dcae 6857
aee9c7d6
JL
6858 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6859 is_submodule_ignored(concatpath, options))
50fd9bd8
JS
6860 return;
6861
0d1e0e78 6862 if (options->flags.reverse_diff) {
35d803bc 6863 SWAP(old_mode, new_mode);
94a0097a
BW
6864 SWAP(old_oid, new_oid);
6865 SWAP(old_oid_valid, new_oid_valid);
35d803bc 6866 SWAP(old_dirty_submodule, new_dirty_submodule);
6973dcae 6867 }
cd676a51
JH
6868
6869 if (options->prefix &&
6870 strncmp(concatpath, options->prefix, options->prefix_length))
6871 return;
6872
6973dcae
JH
6873 one = alloc_filespec(concatpath);
6874 two = alloc_filespec(concatpath);
f9704c2d
BW
6875 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6876 fill_filespec(two, new_oid, new_oid_valid, new_mode);
e3d42c47
JL
6877 one->dirty_submodule = old_dirty_submodule;
6878 two->dirty_submodule = new_dirty_submodule;
f34b205f 6879 p = diff_queue(&diff_queued_diff, one, two);
6973dcae 6880
0d1e0e78 6881 if (options->flags.diff_from_contents)
f34b205f
NTND
6882 return;
6883
0d1e0e78 6884 if (options->flags.quick && options->skip_stat_unmatch &&
d2d7fbe1
JK
6885 !diff_filespec_check_stat_unmatch(options->repo, p)) {
6886 diff_free_filespec_data(p->one);
6887 diff_free_filespec_data(p->two);
f34b205f 6888 return;
d2d7fbe1 6889 }
f34b205f 6890
0d1e0e78 6891 options->flags.has_changes = 1;
6973dcae
JH
6892}
6893
fa7b2908 6894struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6973dcae 6895{
76399c01 6896 struct diff_filepair *pair;
6973dcae 6897 struct diff_filespec *one, *two;
cd676a51
JH
6898
6899 if (options->prefix &&
6900 strncmp(path, options->prefix, options->prefix_length))
76399c01 6901 return NULL;
cd676a51 6902
6973dcae
JH
6903 one = alloc_filespec(path);
6904 two = alloc_filespec(path);
76399c01
JH
6905 pair = diff_queue(&diff_queued_diff, one, two);
6906 pair->is_unmerged = 1;
6907 return pair;
6973dcae 6908}
9cb92c39 6909
b78ea5fc
NTND
6910static char *run_textconv(struct repository *r,
6911 const char *pgm,
6912 struct diff_filespec *spec,
6913 size_t *outsize)
9cb92c39 6914{
479b0ae8 6915 struct diff_tempfile *temp;
9cb92c39
JK
6916 const char *argv[3];
6917 const char **arg = argv;
d3180279 6918 struct child_process child = CHILD_PROCESS_INIT;
9cb92c39 6919 struct strbuf buf = STRBUF_INIT;
da1fbed3 6920 int err = 0;
9cb92c39 6921
b78ea5fc 6922 temp = prepare_temp_file(r, spec->path, spec);
9cb92c39 6923 *arg++ = pgm;
479b0ae8 6924 *arg++ = temp->name;
9cb92c39
JK
6925 *arg = NULL;
6926
41a457e4 6927 child.use_shell = 1;
9cb92c39
JK
6928 child.argv = argv;
6929 child.out = -1;
da1fbed3 6930 if (start_command(&child)) {
479b0ae8 6931 remove_tempfile();
9cb92c39
JK
6932 return NULL;
6933 }
da1fbed3
JS
6934
6935 if (strbuf_read(&buf, child.out, 0) < 0)
6936 err = error("error reading from textconv command '%s'", pgm);
70d70999 6937 close(child.out);
da1fbed3
JS
6938
6939 if (finish_command(&child) || err) {
6940 strbuf_release(&buf);
6941 remove_tempfile();
6942 return NULL;
6943 }
479b0ae8 6944 remove_tempfile();
9cb92c39
JK
6945
6946 return strbuf_detach(&buf, outsize);
6947}
840383b2 6948
6afaf807
NTND
6949size_t fill_textconv(struct repository *r,
6950 struct userdiff_driver *driver,
a788d7d5
AB
6951 struct diff_filespec *df,
6952 char **outbuf)
840383b2
JK
6953{
6954 size_t size;
6955
a64e6a44 6956 if (!driver) {
840383b2
JK
6957 if (!DIFF_FILE_VALID(df)) {
6958 *outbuf = "";
6959 return 0;
6960 }
1c37e86a 6961 if (diff_populate_filespec(r, df, NULL))
840383b2
JK
6962 die("unable to read files to diff");
6963 *outbuf = df->data;
6964 return df->size;
6965 }
6966
a64e6a44 6967 if (!driver->textconv)
033abf97 6968 BUG("fill_textconv called with non-textconv driver");
a64e6a44 6969
41c9560e 6970 if (driver->textconv_cache && df->oid_valid) {
a0d12c44 6971 *outbuf = notes_cache_get(driver->textconv_cache,
569aa376 6972 &df->oid,
d9bae1a1
JK
6973 &size);
6974 if (*outbuf)
6975 return size;
6976 }
6977
b78ea5fc 6978 *outbuf = run_textconv(r, driver->textconv, df, &size);
840383b2
JK
6979 if (!*outbuf)
6980 die("unable to read files to diff");
d9bae1a1 6981
41c9560e 6982 if (driver->textconv_cache && df->oid_valid) {
d9bae1a1 6983 /* ignore errors, as we might be in a readonly repository */
569aa376 6984 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
d9bae1a1
JK
6985 size);
6986 /*
6987 * we could save up changes and flush them all at the end,
6988 * but we would need an extra call after all diffing is done.
6989 * Since generating a cache entry is the slow path anyway,
6990 * this extra overhead probably isn't a big deal.
6991 */
6992 notes_cache_write(driver->textconv_cache);
6993 }
6994
840383b2
JK
6995 return size;
6996}
4914c962 6997
6afaf807
NTND
6998int textconv_object(struct repository *r,
6999 const char *path,
3a35cb2e
JS
7000 unsigned mode,
7001 const struct object_id *oid,
7002 int oid_valid,
7003 char **buf,
7004 unsigned long *buf_size)
7005{
7006 struct diff_filespec *df;
7007 struct userdiff_driver *textconv;
7008
7009 df = alloc_filespec(path);
a6f38c10 7010 fill_filespec(df, oid, oid_valid, mode);
bd7ad45b 7011 textconv = get_textconv(r, df);
3a35cb2e
JS
7012 if (!textconv) {
7013 free_filespec(df);
7014 return 0;
7015 }
7016
6afaf807 7017 *buf_size = fill_textconv(r, textconv, df, buf);
3a35cb2e
JS
7018 free_filespec(df);
7019 return 1;
7020}
7021
4914c962
NTND
7022void setup_diff_pager(struct diff_options *opt)
7023{
7024 /*
7025 * If the user asked for our exit code, then either they want --quiet
7026 * or --exit-code. We should definitely not bother with a pager in the
7027 * former case, as we will generate no output. Since we still properly
7028 * report our exit code even when a pager is run, we _could_ run a
7029 * pager with --exit-code. But since we have not done so historically,
7030 * and because it is easy to find people oneline advising "git diff
7031 * --exit-code" in hooks and other scripts, we do not do so.
7032 */
0d1e0e78 7033 if (!opt->flags.exit_with_status &&
4914c962
NTND
7034 check_pager_config("diff") != 0)
7035 setup_pager();
7036}