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diff --color-moved=zebra: be stricter with color alternation
[thirdparty/git.git] / diff.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "tempfile.h"
7 #include "quote.h"
8 #include "diff.h"
9 #include "diffcore.h"
10 #include "delta.h"
11 #include "xdiff-interface.h"
12 #include "color.h"
13 #include "attr.h"
14 #include "run-command.h"
15 #include "utf8.h"
16 #include "object-store.h"
17 #include "userdiff.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "hashmap.h"
21 #include "ll-merge.h"
22 #include "string-list.h"
23 #include "argv-array.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "help.h"
27
28 #ifdef NO_FAST_WORKING_DIRECTORY
29 #define FAST_WORKING_DIRECTORY 0
30 #else
31 #define FAST_WORKING_DIRECTORY 1
32 #endif
33
34 static int diff_detect_rename_default;
35 static int diff_indent_heuristic = 1;
36 static int diff_rename_limit_default = 400;
37 static int diff_suppress_blank_empty;
38 static int diff_use_color_default = -1;
39 static int diff_color_moved_default;
40 static int diff_color_moved_ws_default;
41 static int diff_context_default = 3;
42 static int diff_interhunk_context_default;
43 static const char *diff_word_regex_cfg;
44 static const char *external_diff_cmd_cfg;
45 static const char *diff_order_file_cfg;
46 int diff_auto_refresh_index = 1;
47 static int diff_mnemonic_prefix;
48 static int diff_no_prefix;
49 static int diff_stat_graph_width;
50 static int diff_dirstat_permille_default = 30;
51 static struct diff_options default_diff_options;
52 static long diff_algorithm;
53 static unsigned ws_error_highlight_default = WSEH_NEW;
54
55 static char diff_colors[][COLOR_MAXLEN] = {
56 GIT_COLOR_RESET,
57 GIT_COLOR_NORMAL, /* CONTEXT */
58 GIT_COLOR_BOLD, /* METAINFO */
59 GIT_COLOR_CYAN, /* FRAGINFO */
60 GIT_COLOR_RED, /* OLD */
61 GIT_COLOR_GREEN, /* NEW */
62 GIT_COLOR_YELLOW, /* COMMIT */
63 GIT_COLOR_BG_RED, /* WHITESPACE */
64 GIT_COLOR_NORMAL, /* FUNCINFO */
65 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
66 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
67 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
68 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
69 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
70 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
71 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
72 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
73 GIT_COLOR_FAINT, /* CONTEXT_DIM */
74 GIT_COLOR_FAINT_RED, /* OLD_DIM */
75 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
76 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
77 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
78 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
79 };
80
81 static const char *color_diff_slots[] = {
82 [DIFF_CONTEXT] = "context",
83 [DIFF_METAINFO] = "meta",
84 [DIFF_FRAGINFO] = "frag",
85 [DIFF_FILE_OLD] = "old",
86 [DIFF_FILE_NEW] = "new",
87 [DIFF_COMMIT] = "commit",
88 [DIFF_WHITESPACE] = "whitespace",
89 [DIFF_FUNCINFO] = "func",
90 [DIFF_FILE_OLD_MOVED] = "oldMoved",
91 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
92 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
93 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
94 [DIFF_FILE_NEW_MOVED] = "newMoved",
95 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
96 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
97 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
98 [DIFF_CONTEXT_DIM] = "contextDimmed",
99 [DIFF_FILE_OLD_DIM] = "oldDimmed",
100 [DIFF_FILE_NEW_DIM] = "newDimmed",
101 [DIFF_CONTEXT_BOLD] = "contextBold",
102 [DIFF_FILE_OLD_BOLD] = "oldBold",
103 [DIFF_FILE_NEW_BOLD] = "newBold",
104 };
105
106 static NORETURN void die_want_option(const char *option_name)
107 {
108 die(_("option '%s' requires a value"), option_name);
109 }
110
111 define_list_config_array_extra(color_diff_slots, {"plain"});
112
113 static int parse_diff_color_slot(const char *var)
114 {
115 if (!strcasecmp(var, "plain"))
116 return DIFF_CONTEXT;
117 return LOOKUP_CONFIG(color_diff_slots, var);
118 }
119
120 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
121 struct strbuf *errmsg)
122 {
123 char *params_copy = xstrdup(params_string);
124 struct string_list params = STRING_LIST_INIT_NODUP;
125 int ret = 0;
126 int i;
127
128 if (*params_copy)
129 string_list_split_in_place(&params, params_copy, ',', -1);
130 for (i = 0; i < params.nr; i++) {
131 const char *p = params.items[i].string;
132 if (!strcmp(p, "changes")) {
133 options->flags.dirstat_by_line = 0;
134 options->flags.dirstat_by_file = 0;
135 } else if (!strcmp(p, "lines")) {
136 options->flags.dirstat_by_line = 1;
137 options->flags.dirstat_by_file = 0;
138 } else if (!strcmp(p, "files")) {
139 options->flags.dirstat_by_line = 0;
140 options->flags.dirstat_by_file = 1;
141 } else if (!strcmp(p, "noncumulative")) {
142 options->flags.dirstat_cumulative = 0;
143 } else if (!strcmp(p, "cumulative")) {
144 options->flags.dirstat_cumulative = 1;
145 } else if (isdigit(*p)) {
146 char *end;
147 int permille = strtoul(p, &end, 10) * 10;
148 if (*end == '.' && isdigit(*++end)) {
149 /* only use first digit */
150 permille += *end - '0';
151 /* .. and ignore any further digits */
152 while (isdigit(*++end))
153 ; /* nothing */
154 }
155 if (!*end)
156 options->dirstat_permille = permille;
157 else {
158 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
159 p);
160 ret++;
161 }
162 } else {
163 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
164 ret++;
165 }
166
167 }
168 string_list_clear(&params, 0);
169 free(params_copy);
170 return ret;
171 }
172
173 static int parse_submodule_params(struct diff_options *options, const char *value)
174 {
175 if (!strcmp(value, "log"))
176 options->submodule_format = DIFF_SUBMODULE_LOG;
177 else if (!strcmp(value, "short"))
178 options->submodule_format = DIFF_SUBMODULE_SHORT;
179 else if (!strcmp(value, "diff"))
180 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
181 else
182 return -1;
183 return 0;
184 }
185
186 int git_config_rename(const char *var, const char *value)
187 {
188 if (!value)
189 return DIFF_DETECT_RENAME;
190 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
191 return DIFF_DETECT_COPY;
192 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
193 }
194
195 long parse_algorithm_value(const char *value)
196 {
197 if (!value)
198 return -1;
199 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
200 return 0;
201 else if (!strcasecmp(value, "minimal"))
202 return XDF_NEED_MINIMAL;
203 else if (!strcasecmp(value, "patience"))
204 return XDF_PATIENCE_DIFF;
205 else if (!strcasecmp(value, "histogram"))
206 return XDF_HISTOGRAM_DIFF;
207 return -1;
208 }
209
210 static int parse_one_token(const char **arg, const char *token)
211 {
212 const char *rest;
213 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
214 *arg = rest;
215 return 1;
216 }
217 return 0;
218 }
219
220 static int parse_ws_error_highlight(const char *arg)
221 {
222 const char *orig_arg = arg;
223 unsigned val = 0;
224
225 while (*arg) {
226 if (parse_one_token(&arg, "none"))
227 val = 0;
228 else if (parse_one_token(&arg, "default"))
229 val = WSEH_NEW;
230 else if (parse_one_token(&arg, "all"))
231 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
232 else if (parse_one_token(&arg, "new"))
233 val |= WSEH_NEW;
234 else if (parse_one_token(&arg, "old"))
235 val |= WSEH_OLD;
236 else if (parse_one_token(&arg, "context"))
237 val |= WSEH_CONTEXT;
238 else {
239 return -1 - (int)(arg - orig_arg);
240 }
241 if (*arg)
242 arg++;
243 }
244 return val;
245 }
246
247 /*
248 * These are to give UI layer defaults.
249 * The core-level commands such as git-diff-files should
250 * never be affected by the setting of diff.renames
251 * the user happens to have in the configuration file.
252 */
253 void init_diff_ui_defaults(void)
254 {
255 diff_detect_rename_default = DIFF_DETECT_RENAME;
256 }
257
258 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
259 {
260 if (!strcmp(var, "diff.indentheuristic"))
261 diff_indent_heuristic = git_config_bool(var, value);
262 return 0;
263 }
264
265 static int parse_color_moved(const char *arg)
266 {
267 switch (git_parse_maybe_bool(arg)) {
268 case 0:
269 return COLOR_MOVED_NO;
270 case 1:
271 return COLOR_MOVED_DEFAULT;
272 default:
273 break;
274 }
275
276 if (!strcmp(arg, "no"))
277 return COLOR_MOVED_NO;
278 else if (!strcmp(arg, "plain"))
279 return COLOR_MOVED_PLAIN;
280 else if (!strcmp(arg, "blocks"))
281 return COLOR_MOVED_BLOCKS;
282 else if (!strcmp(arg, "zebra"))
283 return COLOR_MOVED_ZEBRA;
284 else if (!strcmp(arg, "default"))
285 return COLOR_MOVED_DEFAULT;
286 else if (!strcmp(arg, "dimmed-zebra"))
287 return COLOR_MOVED_ZEBRA_DIM;
288 else if (!strcmp(arg, "dimmed_zebra"))
289 return COLOR_MOVED_ZEBRA_DIM;
290 else
291 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
292 }
293
294 static int parse_color_moved_ws(const char *arg)
295 {
296 int ret = 0;
297 struct string_list l = STRING_LIST_INIT_DUP;
298 struct string_list_item *i;
299
300 string_list_split(&l, arg, ',', -1);
301
302 for_each_string_list_item(i, &l) {
303 struct strbuf sb = STRBUF_INIT;
304 strbuf_addstr(&sb, i->string);
305 strbuf_trim(&sb);
306
307 if (!strcmp(sb.buf, "no"))
308 ret = 0;
309 else if (!strcmp(sb.buf, "ignore-space-change"))
310 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
311 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
312 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
313 else if (!strcmp(sb.buf, "ignore-all-space"))
314 ret |= XDF_IGNORE_WHITESPACE;
315 else if (!strcmp(sb.buf, "allow-indentation-change"))
316 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
317 else
318 error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
319
320 strbuf_release(&sb);
321 }
322
323 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
324 (ret & XDF_WHITESPACE_FLAGS))
325 die(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
326
327 string_list_clear(&l, 0);
328
329 return ret;
330 }
331
332 int git_diff_ui_config(const char *var, const char *value, void *cb)
333 {
334 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
335 diff_use_color_default = git_config_colorbool(var, value);
336 return 0;
337 }
338 if (!strcmp(var, "diff.colormoved")) {
339 int cm = parse_color_moved(value);
340 if (cm < 0)
341 return -1;
342 diff_color_moved_default = cm;
343 return 0;
344 }
345 if (!strcmp(var, "diff.colormovedws")) {
346 int cm = parse_color_moved_ws(value);
347 if (cm < 0)
348 return -1;
349 diff_color_moved_ws_default = cm;
350 return 0;
351 }
352 if (!strcmp(var, "diff.context")) {
353 diff_context_default = git_config_int(var, value);
354 if (diff_context_default < 0)
355 return -1;
356 return 0;
357 }
358 if (!strcmp(var, "diff.interhunkcontext")) {
359 diff_interhunk_context_default = git_config_int(var, value);
360 if (diff_interhunk_context_default < 0)
361 return -1;
362 return 0;
363 }
364 if (!strcmp(var, "diff.renames")) {
365 diff_detect_rename_default = git_config_rename(var, value);
366 return 0;
367 }
368 if (!strcmp(var, "diff.autorefreshindex")) {
369 diff_auto_refresh_index = git_config_bool(var, value);
370 return 0;
371 }
372 if (!strcmp(var, "diff.mnemonicprefix")) {
373 diff_mnemonic_prefix = git_config_bool(var, value);
374 return 0;
375 }
376 if (!strcmp(var, "diff.noprefix")) {
377 diff_no_prefix = git_config_bool(var, value);
378 return 0;
379 }
380 if (!strcmp(var, "diff.statgraphwidth")) {
381 diff_stat_graph_width = git_config_int(var, value);
382 return 0;
383 }
384 if (!strcmp(var, "diff.external"))
385 return git_config_string(&external_diff_cmd_cfg, var, value);
386 if (!strcmp(var, "diff.wordregex"))
387 return git_config_string(&diff_word_regex_cfg, var, value);
388 if (!strcmp(var, "diff.orderfile"))
389 return git_config_pathname(&diff_order_file_cfg, var, value);
390
391 if (!strcmp(var, "diff.ignoresubmodules"))
392 handle_ignore_submodules_arg(&default_diff_options, value);
393
394 if (!strcmp(var, "diff.submodule")) {
395 if (parse_submodule_params(&default_diff_options, value))
396 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
397 value);
398 return 0;
399 }
400
401 if (!strcmp(var, "diff.algorithm")) {
402 diff_algorithm = parse_algorithm_value(value);
403 if (diff_algorithm < 0)
404 return -1;
405 return 0;
406 }
407
408 if (!strcmp(var, "diff.wserrorhighlight")) {
409 int val = parse_ws_error_highlight(value);
410 if (val < 0)
411 return -1;
412 ws_error_highlight_default = val;
413 return 0;
414 }
415
416 if (git_color_config(var, value, cb) < 0)
417 return -1;
418
419 return git_diff_basic_config(var, value, cb);
420 }
421
422 int git_diff_basic_config(const char *var, const char *value, void *cb)
423 {
424 const char *name;
425
426 if (!strcmp(var, "diff.renamelimit")) {
427 diff_rename_limit_default = git_config_int(var, value);
428 return 0;
429 }
430
431 if (userdiff_config(var, value) < 0)
432 return -1;
433
434 if (skip_prefix(var, "diff.color.", &name) ||
435 skip_prefix(var, "color.diff.", &name)) {
436 int slot = parse_diff_color_slot(name);
437 if (slot < 0)
438 return 0;
439 if (!value)
440 return config_error_nonbool(var);
441 return color_parse(value, diff_colors[slot]);
442 }
443
444 /* like GNU diff's --suppress-blank-empty option */
445 if (!strcmp(var, "diff.suppressblankempty") ||
446 /* for backwards compatibility */
447 !strcmp(var, "diff.suppress-blank-empty")) {
448 diff_suppress_blank_empty = git_config_bool(var, value);
449 return 0;
450 }
451
452 if (!strcmp(var, "diff.dirstat")) {
453 struct strbuf errmsg = STRBUF_INIT;
454 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
455 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
456 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
457 errmsg.buf);
458 strbuf_release(&errmsg);
459 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
460 return 0;
461 }
462
463 if (git_diff_heuristic_config(var, value, cb) < 0)
464 return -1;
465
466 return git_default_config(var, value, cb);
467 }
468
469 static char *quote_two(const char *one, const char *two)
470 {
471 int need_one = quote_c_style(one, NULL, NULL, 1);
472 int need_two = quote_c_style(two, NULL, NULL, 1);
473 struct strbuf res = STRBUF_INIT;
474
475 if (need_one + need_two) {
476 strbuf_addch(&res, '"');
477 quote_c_style(one, &res, NULL, 1);
478 quote_c_style(two, &res, NULL, 1);
479 strbuf_addch(&res, '"');
480 } else {
481 strbuf_addstr(&res, one);
482 strbuf_addstr(&res, two);
483 }
484 return strbuf_detach(&res, NULL);
485 }
486
487 static const char *external_diff(void)
488 {
489 static const char *external_diff_cmd = NULL;
490 static int done_preparing = 0;
491
492 if (done_preparing)
493 return external_diff_cmd;
494 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
495 if (!external_diff_cmd)
496 external_diff_cmd = external_diff_cmd_cfg;
497 done_preparing = 1;
498 return external_diff_cmd;
499 }
500
501 /*
502 * Keep track of files used for diffing. Sometimes such an entry
503 * refers to a temporary file, sometimes to an existing file, and
504 * sometimes to "/dev/null".
505 */
506 static struct diff_tempfile {
507 /*
508 * filename external diff should read from, or NULL if this
509 * entry is currently not in use:
510 */
511 const char *name;
512
513 char hex[GIT_MAX_HEXSZ + 1];
514 char mode[10];
515
516 /*
517 * If this diff_tempfile instance refers to a temporary file,
518 * this tempfile object is used to manage its lifetime.
519 */
520 struct tempfile *tempfile;
521 } diff_temp[2];
522
523 struct emit_callback {
524 int color_diff;
525 unsigned ws_rule;
526 int blank_at_eof_in_preimage;
527 int blank_at_eof_in_postimage;
528 int lno_in_preimage;
529 int lno_in_postimage;
530 const char **label_path;
531 struct diff_words_data *diff_words;
532 struct diff_options *opt;
533 struct strbuf *header;
534 };
535
536 static int count_lines(const char *data, int size)
537 {
538 int count, ch, completely_empty = 1, nl_just_seen = 0;
539 count = 0;
540 while (0 < size--) {
541 ch = *data++;
542 if (ch == '\n') {
543 count++;
544 nl_just_seen = 1;
545 completely_empty = 0;
546 }
547 else {
548 nl_just_seen = 0;
549 completely_empty = 0;
550 }
551 }
552 if (completely_empty)
553 return 0;
554 if (!nl_just_seen)
555 count++; /* no trailing newline */
556 return count;
557 }
558
559 static int fill_mmfile(struct repository *r, mmfile_t *mf,
560 struct diff_filespec *one)
561 {
562 if (!DIFF_FILE_VALID(one)) {
563 mf->ptr = (char *)""; /* does not matter */
564 mf->size = 0;
565 return 0;
566 }
567 else if (diff_populate_filespec(r, one, 0))
568 return -1;
569
570 mf->ptr = one->data;
571 mf->size = one->size;
572 return 0;
573 }
574
575 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
576 static unsigned long diff_filespec_size(struct repository *r,
577 struct diff_filespec *one)
578 {
579 if (!DIFF_FILE_VALID(one))
580 return 0;
581 diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
582 return one->size;
583 }
584
585 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
586 {
587 char *ptr = mf->ptr;
588 long size = mf->size;
589 int cnt = 0;
590
591 if (!size)
592 return cnt;
593 ptr += size - 1; /* pointing at the very end */
594 if (*ptr != '\n')
595 ; /* incomplete line */
596 else
597 ptr--; /* skip the last LF */
598 while (mf->ptr < ptr) {
599 char *prev_eol;
600 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
601 if (*prev_eol == '\n')
602 break;
603 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
604 break;
605 cnt++;
606 ptr = prev_eol - 1;
607 }
608 return cnt;
609 }
610
611 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
612 struct emit_callback *ecbdata)
613 {
614 int l1, l2, at;
615 unsigned ws_rule = ecbdata->ws_rule;
616 l1 = count_trailing_blank(mf1, ws_rule);
617 l2 = count_trailing_blank(mf2, ws_rule);
618 if (l2 <= l1) {
619 ecbdata->blank_at_eof_in_preimage = 0;
620 ecbdata->blank_at_eof_in_postimage = 0;
621 return;
622 }
623 at = count_lines(mf1->ptr, mf1->size);
624 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
625
626 at = count_lines(mf2->ptr, mf2->size);
627 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
628 }
629
630 static void emit_line_0(struct diff_options *o,
631 const char *set_sign, const char *set, unsigned reverse, const char *reset,
632 int first, const char *line, int len)
633 {
634 int has_trailing_newline, has_trailing_carriage_return;
635 int needs_reset = 0; /* at the end of the line */
636 FILE *file = o->file;
637
638 fputs(diff_line_prefix(o), file);
639
640 has_trailing_newline = (len > 0 && line[len-1] == '\n');
641 if (has_trailing_newline)
642 len--;
643
644 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
645 if (has_trailing_carriage_return)
646 len--;
647
648 if (!len && !first)
649 goto end_of_line;
650
651 if (reverse && want_color(o->use_color)) {
652 fputs(GIT_COLOR_REVERSE, file);
653 needs_reset = 1;
654 }
655
656 if (set_sign) {
657 fputs(set_sign, file);
658 needs_reset = 1;
659 }
660
661 if (first)
662 fputc(first, file);
663
664 if (!len)
665 goto end_of_line;
666
667 if (set) {
668 if (set_sign && set != set_sign)
669 fputs(reset, file);
670 fputs(set, file);
671 needs_reset = 1;
672 }
673 fwrite(line, len, 1, file);
674 needs_reset = 1; /* 'line' may contain color codes. */
675
676 end_of_line:
677 if (needs_reset)
678 fputs(reset, file);
679 if (has_trailing_carriage_return)
680 fputc('\r', file);
681 if (has_trailing_newline)
682 fputc('\n', file);
683 }
684
685 static void emit_line(struct diff_options *o, const char *set, const char *reset,
686 const char *line, int len)
687 {
688 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
689 }
690
691 enum diff_symbol {
692 DIFF_SYMBOL_BINARY_DIFF_HEADER,
693 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
694 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
695 DIFF_SYMBOL_BINARY_DIFF_BODY,
696 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
697 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
698 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
699 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
700 DIFF_SYMBOL_STATS_LINE,
701 DIFF_SYMBOL_WORD_DIFF,
702 DIFF_SYMBOL_STAT_SEP,
703 DIFF_SYMBOL_SUMMARY,
704 DIFF_SYMBOL_SUBMODULE_ADD,
705 DIFF_SYMBOL_SUBMODULE_DEL,
706 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
707 DIFF_SYMBOL_SUBMODULE_MODIFIED,
708 DIFF_SYMBOL_SUBMODULE_HEADER,
709 DIFF_SYMBOL_SUBMODULE_ERROR,
710 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
711 DIFF_SYMBOL_REWRITE_DIFF,
712 DIFF_SYMBOL_BINARY_FILES,
713 DIFF_SYMBOL_HEADER,
714 DIFF_SYMBOL_FILEPAIR_PLUS,
715 DIFF_SYMBOL_FILEPAIR_MINUS,
716 DIFF_SYMBOL_WORDS_PORCELAIN,
717 DIFF_SYMBOL_WORDS,
718 DIFF_SYMBOL_CONTEXT,
719 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
720 DIFF_SYMBOL_PLUS,
721 DIFF_SYMBOL_MINUS,
722 DIFF_SYMBOL_NO_LF_EOF,
723 DIFF_SYMBOL_CONTEXT_FRAGINFO,
724 DIFF_SYMBOL_CONTEXT_MARKER,
725 DIFF_SYMBOL_SEPARATOR
726 };
727 /*
728 * Flags for content lines:
729 * 0..12 are whitespace rules
730 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
731 * 16 is marking if the line is blank at EOF
732 */
733 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
734 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
735 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
736 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
737 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
738
739 /*
740 * This struct is used when we need to buffer the output of the diff output.
741 *
742 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
743 * into the pre/post image file. This pointer could be a union with the
744 * line pointer. By storing an offset into the file instead of the literal line,
745 * we can decrease the memory footprint for the buffered output. At first we
746 * may want to only have indirection for the content lines, but we could also
747 * enhance the state for emitting prefabricated lines, e.g. the similarity
748 * score line or hunk/file headers would only need to store a number or path
749 * and then the output can be constructed later on depending on state.
750 */
751 struct emitted_diff_symbol {
752 const char *line;
753 int len;
754 int flags;
755 enum diff_symbol s;
756 };
757 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
758
759 struct emitted_diff_symbols {
760 struct emitted_diff_symbol *buf;
761 int nr, alloc;
762 };
763 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
764
765 static void append_emitted_diff_symbol(struct diff_options *o,
766 struct emitted_diff_symbol *e)
767 {
768 struct emitted_diff_symbol *f;
769
770 ALLOC_GROW(o->emitted_symbols->buf,
771 o->emitted_symbols->nr + 1,
772 o->emitted_symbols->alloc);
773 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
774
775 memcpy(f, e, sizeof(struct emitted_diff_symbol));
776 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
777 }
778
779 struct moved_entry {
780 struct hashmap_entry ent;
781 const struct emitted_diff_symbol *es;
782 struct moved_entry *next_line;
783 };
784
785 /**
786 * The struct ws_delta holds white space differences between moved lines, i.e.
787 * between '+' and '-' lines that have been detected to be a move.
788 * The string contains the difference in leading white spaces, before the
789 * rest of the line is compared using the white space config for move
790 * coloring. The current_longer indicates if the first string in the
791 * comparision is longer than the second.
792 */
793 struct ws_delta {
794 char *string;
795 unsigned int current_longer : 1;
796 };
797 #define WS_DELTA_INIT { NULL, 0 }
798
799 struct moved_block {
800 struct moved_entry *match;
801 struct ws_delta wsd;
802 };
803
804 static void moved_block_clear(struct moved_block *b)
805 {
806 FREE_AND_NULL(b->wsd.string);
807 b->match = NULL;
808 }
809
810 static int compute_ws_delta(const struct emitted_diff_symbol *a,
811 const struct emitted_diff_symbol *b,
812 struct ws_delta *out)
813 {
814 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
815 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
816 int d = longer->len - shorter->len;
817
818 if (strncmp(longer->line + d, shorter->line, shorter->len))
819 return 0;
820
821 out->string = xmemdupz(longer->line, d);
822 out->current_longer = (a == longer);
823
824 return 1;
825 }
826
827 static int cmp_in_block_with_wsd(const struct diff_options *o,
828 const struct moved_entry *cur,
829 const struct moved_entry *match,
830 struct moved_block *pmb,
831 int n)
832 {
833 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
834 int al = cur->es->len, cl = l->len;
835 const char *a = cur->es->line,
836 *b = match->es->line,
837 *c = l->line;
838
839 int wslen;
840
841 /*
842 * We need to check if 'cur' is equal to 'match'.
843 * As those are from the same (+/-) side, we do not need to adjust for
844 * indent changes. However these were found using fuzzy matching
845 * so we do have to check if they are equal.
846 */
847 if (strcmp(a, b))
848 return 1;
849
850 if (!pmb->wsd.string)
851 /*
852 * The white space delta is not active? This can happen
853 * when we exit early in this function.
854 */
855 return 1;
856
857 /*
858 * The indent changes of the block are known and stored in
859 * pmb->wsd; however we need to check if the indent changes of the
860 * current line are still the same as before.
861 *
862 * To do so we need to compare 'l' to 'cur', adjusting the
863 * one of them for the white spaces, depending which was longer.
864 */
865
866 wslen = strlen(pmb->wsd.string);
867 if (pmb->wsd.current_longer) {
868 c += wslen;
869 cl -= wslen;
870 } else {
871 a += wslen;
872 al -= wslen;
873 }
874
875 if (al != cl || memcmp(a, c, al))
876 return 1;
877
878 return 0;
879 }
880
881 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
882 const void *entry,
883 const void *entry_or_key,
884 const void *keydata)
885 {
886 const struct diff_options *diffopt = hashmap_cmp_fn_data;
887 const struct moved_entry *a = entry;
888 const struct moved_entry *b = entry_or_key;
889 unsigned flags = diffopt->color_moved_ws_handling
890 & XDF_WHITESPACE_FLAGS;
891
892 if (diffopt->color_moved_ws_handling &
893 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
894 /*
895 * As there is not specific white space config given,
896 * we'd need to check for a new block, so ignore all
897 * white space. The setup of the white space
898 * configuration for the next block is done else where
899 */
900 flags |= XDF_IGNORE_WHITESPACE;
901
902 return !xdiff_compare_lines(a->es->line, a->es->len,
903 b->es->line, b->es->len,
904 flags);
905 }
906
907 static struct moved_entry *prepare_entry(struct diff_options *o,
908 int line_no)
909 {
910 struct moved_entry *ret = xmalloc(sizeof(*ret));
911 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
912 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
913
914 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
915 ret->es = l;
916 ret->next_line = NULL;
917
918 return ret;
919 }
920
921 static void add_lines_to_move_detection(struct diff_options *o,
922 struct hashmap *add_lines,
923 struct hashmap *del_lines)
924 {
925 struct moved_entry *prev_line = NULL;
926
927 int n;
928 for (n = 0; n < o->emitted_symbols->nr; n++) {
929 struct hashmap *hm;
930 struct moved_entry *key;
931
932 switch (o->emitted_symbols->buf[n].s) {
933 case DIFF_SYMBOL_PLUS:
934 hm = add_lines;
935 break;
936 case DIFF_SYMBOL_MINUS:
937 hm = del_lines;
938 break;
939 default:
940 prev_line = NULL;
941 continue;
942 }
943
944 key = prepare_entry(o, n);
945 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
946 prev_line->next_line = key;
947
948 hashmap_add(hm, key);
949 prev_line = key;
950 }
951 }
952
953 static void pmb_advance_or_null(struct diff_options *o,
954 struct moved_entry *match,
955 struct hashmap *hm,
956 struct moved_block *pmb,
957 int pmb_nr)
958 {
959 int i;
960 for (i = 0; i < pmb_nr; i++) {
961 struct moved_entry *prev = pmb[i].match;
962 struct moved_entry *cur = (prev && prev->next_line) ?
963 prev->next_line : NULL;
964 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
965 pmb[i].match = cur;
966 } else {
967 pmb[i].match = NULL;
968 }
969 }
970 }
971
972 static void pmb_advance_or_null_multi_match(struct diff_options *o,
973 struct moved_entry *match,
974 struct hashmap *hm,
975 struct moved_block *pmb,
976 int pmb_nr, int n)
977 {
978 int i;
979 char *got_match = xcalloc(1, pmb_nr);
980
981 for (; match; match = hashmap_get_next(hm, match)) {
982 for (i = 0; i < pmb_nr; i++) {
983 struct moved_entry *prev = pmb[i].match;
984 struct moved_entry *cur = (prev && prev->next_line) ?
985 prev->next_line : NULL;
986 if (!cur)
987 continue;
988 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
989 got_match[i] |= 1;
990 }
991 }
992
993 for (i = 0; i < pmb_nr; i++) {
994 if (got_match[i]) {
995 /* Advance to the next line */
996 pmb[i].match = pmb[i].match->next_line;
997 } else {
998 moved_block_clear(&pmb[i]);
999 }
1000 }
1001
1002 free(got_match);
1003 }
1004
1005 static int shrink_potential_moved_blocks(struct moved_block *pmb,
1006 int pmb_nr)
1007 {
1008 int lp, rp;
1009
1010 /* Shrink the set of potential block to the remaining running */
1011 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
1012 while (lp < pmb_nr && pmb[lp].match)
1013 lp++;
1014 /* lp points at the first NULL now */
1015
1016 while (rp > -1 && !pmb[rp].match)
1017 rp--;
1018 /* rp points at the last non-NULL */
1019
1020 if (lp < pmb_nr && rp > -1 && lp < rp) {
1021 pmb[lp] = pmb[rp];
1022 pmb[rp].match = NULL;
1023 pmb[rp].wsd.string = NULL;
1024 rp--;
1025 lp++;
1026 }
1027 }
1028
1029 /* Remember the number of running sets */
1030 return rp + 1;
1031 }
1032
1033 /*
1034 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1035 *
1036 * Otherwise, if the last block has fewer alphanumeric characters than
1037 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1038 * that block.
1039 *
1040 * The last block consists of the (n - block_length)'th line up to but not
1041 * including the nth line.
1042 *
1043 * Returns 0 if the last block is empty or is unset by this function, non zero
1044 * otherwise.
1045 *
1046 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1047 * Think of a way to unify them.
1048 */
1049 static int adjust_last_block(struct diff_options *o, int n, int block_length)
1050 {
1051 int i, alnum_count = 0;
1052 if (o->color_moved == COLOR_MOVED_PLAIN)
1053 return block_length;
1054 for (i = 1; i < block_length + 1; i++) {
1055 const char *c = o->emitted_symbols->buf[n - i].line;
1056 for (; *c; c++) {
1057 if (!isalnum(*c))
1058 continue;
1059 alnum_count++;
1060 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1061 return 1;
1062 }
1063 }
1064 for (i = 1; i < block_length + 1; i++)
1065 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1066 return 0;
1067 }
1068
1069 /* Find blocks of moved code, delegate actual coloring decision to helper */
1070 static void mark_color_as_moved(struct diff_options *o,
1071 struct hashmap *add_lines,
1072 struct hashmap *del_lines)
1073 {
1074 struct moved_block *pmb = NULL; /* potentially moved blocks */
1075 int pmb_nr = 0, pmb_alloc = 0;
1076 int n, flipped_block = 0, block_length = 0;
1077
1078
1079 for (n = 0; n < o->emitted_symbols->nr; n++) {
1080 struct hashmap *hm = NULL;
1081 struct moved_entry *key;
1082 struct moved_entry *match = NULL;
1083 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1084 enum diff_symbol last_symbol = 0;
1085
1086 switch (l->s) {
1087 case DIFF_SYMBOL_PLUS:
1088 hm = del_lines;
1089 key = prepare_entry(o, n);
1090 match = hashmap_get(hm, key, NULL);
1091 free(key);
1092 break;
1093 case DIFF_SYMBOL_MINUS:
1094 hm = add_lines;
1095 key = prepare_entry(o, n);
1096 match = hashmap_get(hm, key, NULL);
1097 free(key);
1098 break;
1099 default:
1100 flipped_block = 0;
1101 }
1102
1103 if (!match) {
1104 int i;
1105
1106 adjust_last_block(o, n, block_length);
1107 for(i = 0; i < pmb_nr; i++)
1108 moved_block_clear(&pmb[i]);
1109 pmb_nr = 0;
1110 block_length = 0;
1111 flipped_block = 0;
1112 last_symbol = l->s;
1113 continue;
1114 }
1115
1116 if (o->color_moved == COLOR_MOVED_PLAIN) {
1117 last_symbol = l->s;
1118 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1119 continue;
1120 }
1121
1122 if (o->color_moved_ws_handling &
1123 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1124 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1125 else
1126 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1127
1128 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1129
1130 if (pmb_nr == 0) {
1131 /*
1132 * The current line is the start of a new block.
1133 * Setup the set of potential blocks.
1134 */
1135 for (; match; match = hashmap_get_next(hm, match)) {
1136 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1137 if (o->color_moved_ws_handling &
1138 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1139 if (compute_ws_delta(l, match->es,
1140 &pmb[pmb_nr].wsd))
1141 pmb[pmb_nr++].match = match;
1142 } else {
1143 pmb[pmb_nr].wsd.string = NULL;
1144 pmb[pmb_nr++].match = match;
1145 }
1146 }
1147
1148 if (adjust_last_block(o, n, block_length) &&
1149 pmb_nr && last_symbol != l->s)
1150 flipped_block = (flipped_block + 1) % 2;
1151 else
1152 flipped_block = 0;
1153
1154 block_length = 0;
1155 }
1156
1157 if (pmb_nr) {
1158 block_length++;
1159 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1160 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1161 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1162 }
1163 last_symbol = l->s;
1164 }
1165 adjust_last_block(o, n, block_length);
1166
1167 for(n = 0; n < pmb_nr; n++)
1168 moved_block_clear(&pmb[n]);
1169 free(pmb);
1170 }
1171
1172 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1173 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1174 static void dim_moved_lines(struct diff_options *o)
1175 {
1176 int n;
1177 for (n = 0; n < o->emitted_symbols->nr; n++) {
1178 struct emitted_diff_symbol *prev = (n != 0) ?
1179 &o->emitted_symbols->buf[n - 1] : NULL;
1180 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1181 struct emitted_diff_symbol *next =
1182 (n < o->emitted_symbols->nr - 1) ?
1183 &o->emitted_symbols->buf[n + 1] : NULL;
1184
1185 /* Not a plus or minus line? */
1186 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1187 continue;
1188
1189 /* Not a moved line? */
1190 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1191 continue;
1192
1193 /*
1194 * If prev or next are not a plus or minus line,
1195 * pretend they don't exist
1196 */
1197 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1198 prev->s != DIFF_SYMBOL_MINUS)
1199 prev = NULL;
1200 if (next && next->s != DIFF_SYMBOL_PLUS &&
1201 next->s != DIFF_SYMBOL_MINUS)
1202 next = NULL;
1203
1204 /* Inside a block? */
1205 if ((prev &&
1206 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1207 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1208 (next &&
1209 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1210 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1211 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1212 continue;
1213 }
1214
1215 /* Check if we are at an interesting bound: */
1216 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1217 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1218 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1219 continue;
1220 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1221 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1222 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1223 continue;
1224
1225 /*
1226 * The boundary to prev and next are not interesting,
1227 * so this line is not interesting as a whole
1228 */
1229 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1230 }
1231 }
1232
1233 static void emit_line_ws_markup(struct diff_options *o,
1234 const char *set_sign, const char *set,
1235 const char *reset,
1236 int sign_index, const char *line, int len,
1237 unsigned ws_rule, int blank_at_eof)
1238 {
1239 const char *ws = NULL;
1240 int sign = o->output_indicators[sign_index];
1241
1242 if (o->ws_error_highlight & ws_rule) {
1243 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1244 if (!*ws)
1245 ws = NULL;
1246 }
1247
1248 if (!ws && !set_sign)
1249 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1250 else if (!ws) {
1251 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1252 } else if (blank_at_eof)
1253 /* Blank line at EOF - paint '+' as well */
1254 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1255 else {
1256 /* Emit just the prefix, then the rest. */
1257 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1258 sign, "", 0);
1259 ws_check_emit(line, len, ws_rule,
1260 o->file, set, reset, ws);
1261 }
1262 }
1263
1264 static void emit_diff_symbol_from_struct(struct diff_options *o,
1265 struct emitted_diff_symbol *eds)
1266 {
1267 static const char *nneof = " No newline at end of file\n";
1268 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1269 struct strbuf sb = STRBUF_INIT;
1270
1271 enum diff_symbol s = eds->s;
1272 const char *line = eds->line;
1273 int len = eds->len;
1274 unsigned flags = eds->flags;
1275
1276 switch (s) {
1277 case DIFF_SYMBOL_NO_LF_EOF:
1278 context = diff_get_color_opt(o, DIFF_CONTEXT);
1279 reset = diff_get_color_opt(o, DIFF_RESET);
1280 putc('\n', o->file);
1281 emit_line_0(o, context, NULL, 0, reset, '\\',
1282 nneof, strlen(nneof));
1283 break;
1284 case DIFF_SYMBOL_SUBMODULE_HEADER:
1285 case DIFF_SYMBOL_SUBMODULE_ERROR:
1286 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1287 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1288 case DIFF_SYMBOL_SUMMARY:
1289 case DIFF_SYMBOL_STATS_LINE:
1290 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1291 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1292 emit_line(o, "", "", line, len);
1293 break;
1294 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1295 case DIFF_SYMBOL_CONTEXT_MARKER:
1296 context = diff_get_color_opt(o, DIFF_CONTEXT);
1297 reset = diff_get_color_opt(o, DIFF_RESET);
1298 emit_line(o, context, reset, line, len);
1299 break;
1300 case DIFF_SYMBOL_SEPARATOR:
1301 fprintf(o->file, "%s%c",
1302 diff_line_prefix(o),
1303 o->line_termination);
1304 break;
1305 case DIFF_SYMBOL_CONTEXT:
1306 set = diff_get_color_opt(o, DIFF_CONTEXT);
1307 reset = diff_get_color_opt(o, DIFF_RESET);
1308 set_sign = NULL;
1309 if (o->flags.dual_color_diffed_diffs) {
1310 char c = !len ? 0 : line[0];
1311
1312 if (c == '+')
1313 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1314 else if (c == '@')
1315 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1316 else if (c == '-')
1317 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1318 }
1319 emit_line_ws_markup(o, set_sign, set, reset,
1320 OUTPUT_INDICATOR_CONTEXT, line, len,
1321 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1322 break;
1323 case DIFF_SYMBOL_PLUS:
1324 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1325 DIFF_SYMBOL_MOVED_LINE_ALT |
1326 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1327 case DIFF_SYMBOL_MOVED_LINE |
1328 DIFF_SYMBOL_MOVED_LINE_ALT |
1329 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1330 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1331 break;
1332 case DIFF_SYMBOL_MOVED_LINE |
1333 DIFF_SYMBOL_MOVED_LINE_ALT:
1334 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1335 break;
1336 case DIFF_SYMBOL_MOVED_LINE |
1337 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1338 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1339 break;
1340 case DIFF_SYMBOL_MOVED_LINE:
1341 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1342 break;
1343 default:
1344 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1345 }
1346 reset = diff_get_color_opt(o, DIFF_RESET);
1347 if (!o->flags.dual_color_diffed_diffs)
1348 set_sign = NULL;
1349 else {
1350 char c = !len ? 0 : line[0];
1351
1352 set_sign = set;
1353 if (c == '-')
1354 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1355 else if (c == '@')
1356 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1357 else if (c == '+')
1358 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1359 else
1360 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1361 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1362 }
1363 emit_line_ws_markup(o, set_sign, set, reset,
1364 OUTPUT_INDICATOR_NEW, line, len,
1365 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1366 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1367 break;
1368 case DIFF_SYMBOL_MINUS:
1369 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1370 DIFF_SYMBOL_MOVED_LINE_ALT |
1371 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1372 case DIFF_SYMBOL_MOVED_LINE |
1373 DIFF_SYMBOL_MOVED_LINE_ALT |
1374 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1375 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1376 break;
1377 case DIFF_SYMBOL_MOVED_LINE |
1378 DIFF_SYMBOL_MOVED_LINE_ALT:
1379 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1380 break;
1381 case DIFF_SYMBOL_MOVED_LINE |
1382 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1383 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1384 break;
1385 case DIFF_SYMBOL_MOVED_LINE:
1386 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1387 break;
1388 default:
1389 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1390 }
1391 reset = diff_get_color_opt(o, DIFF_RESET);
1392 if (!o->flags.dual_color_diffed_diffs)
1393 set_sign = NULL;
1394 else {
1395 char c = !len ? 0 : line[0];
1396
1397 set_sign = set;
1398 if (c == '+')
1399 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1400 else if (c == '@')
1401 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1402 else if (c == '-')
1403 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1404 else
1405 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1406 }
1407 emit_line_ws_markup(o, set_sign, set, reset,
1408 OUTPUT_INDICATOR_OLD, line, len,
1409 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1410 break;
1411 case DIFF_SYMBOL_WORDS_PORCELAIN:
1412 context = diff_get_color_opt(o, DIFF_CONTEXT);
1413 reset = diff_get_color_opt(o, DIFF_RESET);
1414 emit_line(o, context, reset, line, len);
1415 fputs("~\n", o->file);
1416 break;
1417 case DIFF_SYMBOL_WORDS:
1418 context = diff_get_color_opt(o, DIFF_CONTEXT);
1419 reset = diff_get_color_opt(o, DIFF_RESET);
1420 /*
1421 * Skip the prefix character, if any. With
1422 * diff_suppress_blank_empty, there may be
1423 * none.
1424 */
1425 if (line[0] != '\n') {
1426 line++;
1427 len--;
1428 }
1429 emit_line(o, context, reset, line, len);
1430 break;
1431 case DIFF_SYMBOL_FILEPAIR_PLUS:
1432 meta = diff_get_color_opt(o, DIFF_METAINFO);
1433 reset = diff_get_color_opt(o, DIFF_RESET);
1434 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1435 line, reset,
1436 strchr(line, ' ') ? "\t" : "");
1437 break;
1438 case DIFF_SYMBOL_FILEPAIR_MINUS:
1439 meta = diff_get_color_opt(o, DIFF_METAINFO);
1440 reset = diff_get_color_opt(o, DIFF_RESET);
1441 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1442 line, reset,
1443 strchr(line, ' ') ? "\t" : "");
1444 break;
1445 case DIFF_SYMBOL_BINARY_FILES:
1446 case DIFF_SYMBOL_HEADER:
1447 fprintf(o->file, "%s", line);
1448 break;
1449 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1450 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1451 break;
1452 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1453 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1454 break;
1455 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1456 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1457 break;
1458 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1459 fputs(diff_line_prefix(o), o->file);
1460 fputc('\n', o->file);
1461 break;
1462 case DIFF_SYMBOL_REWRITE_DIFF:
1463 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1464 reset = diff_get_color_opt(o, DIFF_RESET);
1465 emit_line(o, fraginfo, reset, line, len);
1466 break;
1467 case DIFF_SYMBOL_SUBMODULE_ADD:
1468 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1469 reset = diff_get_color_opt(o, DIFF_RESET);
1470 emit_line(o, set, reset, line, len);
1471 break;
1472 case DIFF_SYMBOL_SUBMODULE_DEL:
1473 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1474 reset = diff_get_color_opt(o, DIFF_RESET);
1475 emit_line(o, set, reset, line, len);
1476 break;
1477 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1478 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1479 diff_line_prefix(o), line);
1480 break;
1481 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1482 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1483 diff_line_prefix(o), line);
1484 break;
1485 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1486 emit_line(o, "", "", " 0 files changed\n",
1487 strlen(" 0 files changed\n"));
1488 break;
1489 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1490 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1491 break;
1492 case DIFF_SYMBOL_WORD_DIFF:
1493 fprintf(o->file, "%.*s", len, line);
1494 break;
1495 case DIFF_SYMBOL_STAT_SEP:
1496 fputs(o->stat_sep, o->file);
1497 break;
1498 default:
1499 BUG("unknown diff symbol");
1500 }
1501 strbuf_release(&sb);
1502 }
1503
1504 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1505 const char *line, int len, unsigned flags)
1506 {
1507 struct emitted_diff_symbol e = {line, len, flags, s};
1508
1509 if (o->emitted_symbols)
1510 append_emitted_diff_symbol(o, &e);
1511 else
1512 emit_diff_symbol_from_struct(o, &e);
1513 }
1514
1515 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1516 {
1517 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1518 }
1519
1520 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1521 {
1522 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1523 }
1524
1525 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1526 {
1527 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1528 path, strlen(path), 0);
1529 }
1530
1531 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1532 {
1533 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1534 path, strlen(path), 0);
1535 }
1536
1537 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1538 {
1539 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1540 header, strlen(header), 0);
1541 }
1542
1543 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1544 {
1545 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1546 }
1547
1548 void diff_emit_submodule_pipethrough(struct diff_options *o,
1549 const char *line, int len)
1550 {
1551 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1552 }
1553
1554 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1555 {
1556 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1557 ecbdata->blank_at_eof_in_preimage &&
1558 ecbdata->blank_at_eof_in_postimage &&
1559 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1560 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1561 return 0;
1562 return ws_blank_line(line, len, ecbdata->ws_rule);
1563 }
1564
1565 static void emit_add_line(const char *reset,
1566 struct emit_callback *ecbdata,
1567 const char *line, int len)
1568 {
1569 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1570 if (new_blank_line_at_eof(ecbdata, line, len))
1571 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1572
1573 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1574 }
1575
1576 static void emit_del_line(const char *reset,
1577 struct emit_callback *ecbdata,
1578 const char *line, int len)
1579 {
1580 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1581 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1582 }
1583
1584 static void emit_context_line(const char *reset,
1585 struct emit_callback *ecbdata,
1586 const char *line, int len)
1587 {
1588 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1589 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1590 }
1591
1592 static void emit_hunk_header(struct emit_callback *ecbdata,
1593 const char *line, int len)
1594 {
1595 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1596 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1597 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1598 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1599 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1600 static const char atat[2] = { '@', '@' };
1601 const char *cp, *ep;
1602 struct strbuf msgbuf = STRBUF_INIT;
1603 int org_len = len;
1604 int i = 1;
1605
1606 /*
1607 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1608 * it always is at least 10 bytes long.
1609 */
1610 if (len < 10 ||
1611 memcmp(line, atat, 2) ||
1612 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1613 emit_diff_symbol(ecbdata->opt,
1614 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1615 return;
1616 }
1617 ep += 2; /* skip over @@ */
1618
1619 /* The hunk header in fraginfo color */
1620 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1621 strbuf_addstr(&msgbuf, reverse);
1622 strbuf_addstr(&msgbuf, frag);
1623 strbuf_add(&msgbuf, line, ep - line);
1624 strbuf_addstr(&msgbuf, reset);
1625
1626 /*
1627 * trailing "\r\n"
1628 */
1629 for ( ; i < 3; i++)
1630 if (line[len - i] == '\r' || line[len - i] == '\n')
1631 len--;
1632
1633 /* blank before the func header */
1634 for (cp = ep; ep - line < len; ep++)
1635 if (*ep != ' ' && *ep != '\t')
1636 break;
1637 if (ep != cp) {
1638 strbuf_addstr(&msgbuf, context);
1639 strbuf_add(&msgbuf, cp, ep - cp);
1640 strbuf_addstr(&msgbuf, reset);
1641 }
1642
1643 if (ep < line + len) {
1644 strbuf_addstr(&msgbuf, func);
1645 strbuf_add(&msgbuf, ep, line + len - ep);
1646 strbuf_addstr(&msgbuf, reset);
1647 }
1648
1649 strbuf_add(&msgbuf, line + len, org_len - len);
1650 strbuf_complete_line(&msgbuf);
1651 emit_diff_symbol(ecbdata->opt,
1652 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1653 strbuf_release(&msgbuf);
1654 }
1655
1656 static struct diff_tempfile *claim_diff_tempfile(void) {
1657 int i;
1658 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1659 if (!diff_temp[i].name)
1660 return diff_temp + i;
1661 BUG("diff is failing to clean up its tempfiles");
1662 }
1663
1664 static void remove_tempfile(void)
1665 {
1666 int i;
1667 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1668 if (is_tempfile_active(diff_temp[i].tempfile))
1669 delete_tempfile(&diff_temp[i].tempfile);
1670 diff_temp[i].name = NULL;
1671 }
1672 }
1673
1674 static void add_line_count(struct strbuf *out, int count)
1675 {
1676 switch (count) {
1677 case 0:
1678 strbuf_addstr(out, "0,0");
1679 break;
1680 case 1:
1681 strbuf_addstr(out, "1");
1682 break;
1683 default:
1684 strbuf_addf(out, "1,%d", count);
1685 break;
1686 }
1687 }
1688
1689 static void emit_rewrite_lines(struct emit_callback *ecb,
1690 int prefix, const char *data, int size)
1691 {
1692 const char *endp = NULL;
1693 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1694
1695 while (0 < size) {
1696 int len;
1697
1698 endp = memchr(data, '\n', size);
1699 len = endp ? (endp - data + 1) : size;
1700 if (prefix != '+') {
1701 ecb->lno_in_preimage++;
1702 emit_del_line(reset, ecb, data, len);
1703 } else {
1704 ecb->lno_in_postimage++;
1705 emit_add_line(reset, ecb, data, len);
1706 }
1707 size -= len;
1708 data += len;
1709 }
1710 if (!endp)
1711 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1712 }
1713
1714 static void emit_rewrite_diff(const char *name_a,
1715 const char *name_b,
1716 struct diff_filespec *one,
1717 struct diff_filespec *two,
1718 struct userdiff_driver *textconv_one,
1719 struct userdiff_driver *textconv_two,
1720 struct diff_options *o)
1721 {
1722 int lc_a, lc_b;
1723 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1724 const char *a_prefix, *b_prefix;
1725 char *data_one, *data_two;
1726 size_t size_one, size_two;
1727 struct emit_callback ecbdata;
1728 struct strbuf out = STRBUF_INIT;
1729
1730 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1731 a_prefix = o->b_prefix;
1732 b_prefix = o->a_prefix;
1733 } else {
1734 a_prefix = o->a_prefix;
1735 b_prefix = o->b_prefix;
1736 }
1737
1738 name_a += (*name_a == '/');
1739 name_b += (*name_b == '/');
1740
1741 strbuf_reset(&a_name);
1742 strbuf_reset(&b_name);
1743 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1744 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1745
1746 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1747 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1748
1749 memset(&ecbdata, 0, sizeof(ecbdata));
1750 ecbdata.color_diff = want_color(o->use_color);
1751 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1752 ecbdata.opt = o;
1753 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1754 mmfile_t mf1, mf2;
1755 mf1.ptr = (char *)data_one;
1756 mf2.ptr = (char *)data_two;
1757 mf1.size = size_one;
1758 mf2.size = size_two;
1759 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1760 }
1761 ecbdata.lno_in_preimage = 1;
1762 ecbdata.lno_in_postimage = 1;
1763
1764 lc_a = count_lines(data_one, size_one);
1765 lc_b = count_lines(data_two, size_two);
1766
1767 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1768 a_name.buf, a_name.len, 0);
1769 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1770 b_name.buf, b_name.len, 0);
1771
1772 strbuf_addstr(&out, "@@ -");
1773 if (!o->irreversible_delete)
1774 add_line_count(&out, lc_a);
1775 else
1776 strbuf_addstr(&out, "?,?");
1777 strbuf_addstr(&out, " +");
1778 add_line_count(&out, lc_b);
1779 strbuf_addstr(&out, " @@\n");
1780 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1781 strbuf_release(&out);
1782
1783 if (lc_a && !o->irreversible_delete)
1784 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1785 if (lc_b)
1786 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1787 if (textconv_one)
1788 free((char *)data_one);
1789 if (textconv_two)
1790 free((char *)data_two);
1791 }
1792
1793 struct diff_words_buffer {
1794 mmfile_t text;
1795 unsigned long alloc;
1796 struct diff_words_orig {
1797 const char *begin, *end;
1798 } *orig;
1799 int orig_nr, orig_alloc;
1800 };
1801
1802 static void diff_words_append(char *line, unsigned long len,
1803 struct diff_words_buffer *buffer)
1804 {
1805 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1806 line++;
1807 len--;
1808 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1809 buffer->text.size += len;
1810 buffer->text.ptr[buffer->text.size] = '\0';
1811 }
1812
1813 struct diff_words_style_elem {
1814 const char *prefix;
1815 const char *suffix;
1816 const char *color; /* NULL; filled in by the setup code if
1817 * color is enabled */
1818 };
1819
1820 struct diff_words_style {
1821 enum diff_words_type type;
1822 struct diff_words_style_elem new_word, old_word, ctx;
1823 const char *newline;
1824 };
1825
1826 static struct diff_words_style diff_words_styles[] = {
1827 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1828 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1829 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1830 };
1831
1832 struct diff_words_data {
1833 struct diff_words_buffer minus, plus;
1834 const char *current_plus;
1835 int last_minus;
1836 struct diff_options *opt;
1837 regex_t *word_regex;
1838 enum diff_words_type type;
1839 struct diff_words_style *style;
1840 };
1841
1842 static int fn_out_diff_words_write_helper(struct diff_options *o,
1843 struct diff_words_style_elem *st_el,
1844 const char *newline,
1845 size_t count, const char *buf)
1846 {
1847 int print = 0;
1848 struct strbuf sb = STRBUF_INIT;
1849
1850 while (count) {
1851 char *p = memchr(buf, '\n', count);
1852 if (print)
1853 strbuf_addstr(&sb, diff_line_prefix(o));
1854
1855 if (p != buf) {
1856 const char *reset = st_el->color && *st_el->color ?
1857 GIT_COLOR_RESET : NULL;
1858 if (st_el->color && *st_el->color)
1859 strbuf_addstr(&sb, st_el->color);
1860 strbuf_addstr(&sb, st_el->prefix);
1861 strbuf_add(&sb, buf, p ? p - buf : count);
1862 strbuf_addstr(&sb, st_el->suffix);
1863 if (reset)
1864 strbuf_addstr(&sb, reset);
1865 }
1866 if (!p)
1867 goto out;
1868
1869 strbuf_addstr(&sb, newline);
1870 count -= p + 1 - buf;
1871 buf = p + 1;
1872 print = 1;
1873 if (count) {
1874 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1875 sb.buf, sb.len, 0);
1876 strbuf_reset(&sb);
1877 }
1878 }
1879
1880 out:
1881 if (sb.len)
1882 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1883 sb.buf, sb.len, 0);
1884 strbuf_release(&sb);
1885 return 0;
1886 }
1887
1888 /*
1889 * '--color-words' algorithm can be described as:
1890 *
1891 * 1. collect the minus/plus lines of a diff hunk, divided into
1892 * minus-lines and plus-lines;
1893 *
1894 * 2. break both minus-lines and plus-lines into words and
1895 * place them into two mmfile_t with one word for each line;
1896 *
1897 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1898 *
1899 * And for the common parts of the both file, we output the plus side text.
1900 * diff_words->current_plus is used to trace the current position of the plus file
1901 * which printed. diff_words->last_minus is used to trace the last minus word
1902 * printed.
1903 *
1904 * For '--graph' to work with '--color-words', we need to output the graph prefix
1905 * on each line of color words output. Generally, there are two conditions on
1906 * which we should output the prefix.
1907 *
1908 * 1. diff_words->last_minus == 0 &&
1909 * diff_words->current_plus == diff_words->plus.text.ptr
1910 *
1911 * that is: the plus text must start as a new line, and if there is no minus
1912 * word printed, a graph prefix must be printed.
1913 *
1914 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1915 * *(diff_words->current_plus - 1) == '\n'
1916 *
1917 * that is: a graph prefix must be printed following a '\n'
1918 */
1919 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1920 {
1921 if ((diff_words->last_minus == 0 &&
1922 diff_words->current_plus == diff_words->plus.text.ptr) ||
1923 (diff_words->current_plus > diff_words->plus.text.ptr &&
1924 *(diff_words->current_plus - 1) == '\n')) {
1925 return 1;
1926 } else {
1927 return 0;
1928 }
1929 }
1930
1931 static void fn_out_diff_words_aux(void *priv,
1932 long minus_first, long minus_len,
1933 long plus_first, long plus_len,
1934 const char *func, long funclen)
1935 {
1936 struct diff_words_data *diff_words = priv;
1937 struct diff_words_style *style = diff_words->style;
1938 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1939 struct diff_options *opt = diff_words->opt;
1940 const char *line_prefix;
1941
1942 assert(opt);
1943 line_prefix = diff_line_prefix(opt);
1944
1945 /* POSIX requires that first be decremented by one if len == 0... */
1946 if (minus_len) {
1947 minus_begin = diff_words->minus.orig[minus_first].begin;
1948 minus_end =
1949 diff_words->minus.orig[minus_first + minus_len - 1].end;
1950 } else
1951 minus_begin = minus_end =
1952 diff_words->minus.orig[minus_first].end;
1953
1954 if (plus_len) {
1955 plus_begin = diff_words->plus.orig[plus_first].begin;
1956 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1957 } else
1958 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1959
1960 if (color_words_output_graph_prefix(diff_words)) {
1961 fputs(line_prefix, diff_words->opt->file);
1962 }
1963 if (diff_words->current_plus != plus_begin) {
1964 fn_out_diff_words_write_helper(diff_words->opt,
1965 &style->ctx, style->newline,
1966 plus_begin - diff_words->current_plus,
1967 diff_words->current_plus);
1968 }
1969 if (minus_begin != minus_end) {
1970 fn_out_diff_words_write_helper(diff_words->opt,
1971 &style->old_word, style->newline,
1972 minus_end - minus_begin, minus_begin);
1973 }
1974 if (plus_begin != plus_end) {
1975 fn_out_diff_words_write_helper(diff_words->opt,
1976 &style->new_word, style->newline,
1977 plus_end - plus_begin, plus_begin);
1978 }
1979
1980 diff_words->current_plus = plus_end;
1981 diff_words->last_minus = minus_first;
1982 }
1983
1984 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1985 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1986 int *begin, int *end)
1987 {
1988 if (word_regex && *begin < buffer->size) {
1989 regmatch_t match[1];
1990 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1991 buffer->size - *begin, 1, match, 0)) {
1992 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1993 '\n', match[0].rm_eo - match[0].rm_so);
1994 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1995 *begin += match[0].rm_so;
1996 return *begin >= *end;
1997 }
1998 return -1;
1999 }
2000
2001 /* find the next word */
2002 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2003 (*begin)++;
2004 if (*begin >= buffer->size)
2005 return -1;
2006
2007 /* find the end of the word */
2008 *end = *begin + 1;
2009 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2010 (*end)++;
2011
2012 return 0;
2013 }
2014
2015 /*
2016 * This function splits the words in buffer->text, stores the list with
2017 * newline separator into out, and saves the offsets of the original words
2018 * in buffer->orig.
2019 */
2020 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2021 regex_t *word_regex)
2022 {
2023 int i, j;
2024 long alloc = 0;
2025
2026 out->size = 0;
2027 out->ptr = NULL;
2028
2029 /* fake an empty "0th" word */
2030 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2031 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2032 buffer->orig_nr = 1;
2033
2034 for (i = 0; i < buffer->text.size; i++) {
2035 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2036 return;
2037
2038 /* store original boundaries */
2039 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2040 buffer->orig_alloc);
2041 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2042 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2043 buffer->orig_nr++;
2044
2045 /* store one word */
2046 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2047 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2048 out->ptr[out->size + j - i] = '\n';
2049 out->size += j - i + 1;
2050
2051 i = j - 1;
2052 }
2053 }
2054
2055 /* this executes the word diff on the accumulated buffers */
2056 static void diff_words_show(struct diff_words_data *diff_words)
2057 {
2058 xpparam_t xpp;
2059 xdemitconf_t xecfg;
2060 mmfile_t minus, plus;
2061 struct diff_words_style *style = diff_words->style;
2062
2063 struct diff_options *opt = diff_words->opt;
2064 const char *line_prefix;
2065
2066 assert(opt);
2067 line_prefix = diff_line_prefix(opt);
2068
2069 /* special case: only removal */
2070 if (!diff_words->plus.text.size) {
2071 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2072 line_prefix, strlen(line_prefix), 0);
2073 fn_out_diff_words_write_helper(diff_words->opt,
2074 &style->old_word, style->newline,
2075 diff_words->minus.text.size,
2076 diff_words->minus.text.ptr);
2077 diff_words->minus.text.size = 0;
2078 return;
2079 }
2080
2081 diff_words->current_plus = diff_words->plus.text.ptr;
2082 diff_words->last_minus = 0;
2083
2084 memset(&xpp, 0, sizeof(xpp));
2085 memset(&xecfg, 0, sizeof(xecfg));
2086 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2087 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2088 xpp.flags = 0;
2089 /* as only the hunk header will be parsed, we need a 0-context */
2090 xecfg.ctxlen = 0;
2091 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2092 diff_words, &xpp, &xecfg))
2093 die("unable to generate word diff");
2094 free(minus.ptr);
2095 free(plus.ptr);
2096 if (diff_words->current_plus != diff_words->plus.text.ptr +
2097 diff_words->plus.text.size) {
2098 if (color_words_output_graph_prefix(diff_words))
2099 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2100 line_prefix, strlen(line_prefix), 0);
2101 fn_out_diff_words_write_helper(diff_words->opt,
2102 &style->ctx, style->newline,
2103 diff_words->plus.text.ptr + diff_words->plus.text.size
2104 - diff_words->current_plus, diff_words->current_plus);
2105 }
2106 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2107 }
2108
2109 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2110 static void diff_words_flush(struct emit_callback *ecbdata)
2111 {
2112 struct diff_options *wo = ecbdata->diff_words->opt;
2113
2114 if (ecbdata->diff_words->minus.text.size ||
2115 ecbdata->diff_words->plus.text.size)
2116 diff_words_show(ecbdata->diff_words);
2117
2118 if (wo->emitted_symbols) {
2119 struct diff_options *o = ecbdata->opt;
2120 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2121 int i;
2122
2123 /*
2124 * NEEDSWORK:
2125 * Instead of appending each, concat all words to a line?
2126 */
2127 for (i = 0; i < wol->nr; i++)
2128 append_emitted_diff_symbol(o, &wol->buf[i]);
2129
2130 for (i = 0; i < wol->nr; i++)
2131 free((void *)wol->buf[i].line);
2132
2133 wol->nr = 0;
2134 }
2135 }
2136
2137 static void diff_filespec_load_driver(struct diff_filespec *one,
2138 struct index_state *istate)
2139 {
2140 /* Use already-loaded driver */
2141 if (one->driver)
2142 return;
2143
2144 if (S_ISREG(one->mode))
2145 one->driver = userdiff_find_by_path(istate, one->path);
2146
2147 /* Fallback to default settings */
2148 if (!one->driver)
2149 one->driver = userdiff_find_by_name("default");
2150 }
2151
2152 static const char *userdiff_word_regex(struct diff_filespec *one,
2153 struct index_state *istate)
2154 {
2155 diff_filespec_load_driver(one, istate);
2156 return one->driver->word_regex;
2157 }
2158
2159 static void init_diff_words_data(struct emit_callback *ecbdata,
2160 struct diff_options *orig_opts,
2161 struct diff_filespec *one,
2162 struct diff_filespec *two)
2163 {
2164 int i;
2165 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2166 memcpy(o, orig_opts, sizeof(struct diff_options));
2167
2168 ecbdata->diff_words =
2169 xcalloc(1, sizeof(struct diff_words_data));
2170 ecbdata->diff_words->type = o->word_diff;
2171 ecbdata->diff_words->opt = o;
2172
2173 if (orig_opts->emitted_symbols)
2174 o->emitted_symbols =
2175 xcalloc(1, sizeof(struct emitted_diff_symbols));
2176
2177 if (!o->word_regex)
2178 o->word_regex = userdiff_word_regex(one, o->repo->index);
2179 if (!o->word_regex)
2180 o->word_regex = userdiff_word_regex(two, o->repo->index);
2181 if (!o->word_regex)
2182 o->word_regex = diff_word_regex_cfg;
2183 if (o->word_regex) {
2184 ecbdata->diff_words->word_regex = (regex_t *)
2185 xmalloc(sizeof(regex_t));
2186 if (regcomp(ecbdata->diff_words->word_regex,
2187 o->word_regex,
2188 REG_EXTENDED | REG_NEWLINE))
2189 die("invalid regular expression: %s",
2190 o->word_regex);
2191 }
2192 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2193 if (o->word_diff == diff_words_styles[i].type) {
2194 ecbdata->diff_words->style =
2195 &diff_words_styles[i];
2196 break;
2197 }
2198 }
2199 if (want_color(o->use_color)) {
2200 struct diff_words_style *st = ecbdata->diff_words->style;
2201 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2202 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2203 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2204 }
2205 }
2206
2207 static void free_diff_words_data(struct emit_callback *ecbdata)
2208 {
2209 if (ecbdata->diff_words) {
2210 diff_words_flush(ecbdata);
2211 free (ecbdata->diff_words->opt->emitted_symbols);
2212 free (ecbdata->diff_words->opt);
2213 free (ecbdata->diff_words->minus.text.ptr);
2214 free (ecbdata->diff_words->minus.orig);
2215 free (ecbdata->diff_words->plus.text.ptr);
2216 free (ecbdata->diff_words->plus.orig);
2217 if (ecbdata->diff_words->word_regex) {
2218 regfree(ecbdata->diff_words->word_regex);
2219 free(ecbdata->diff_words->word_regex);
2220 }
2221 FREE_AND_NULL(ecbdata->diff_words);
2222 }
2223 }
2224
2225 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2226 {
2227 if (want_color(diff_use_color))
2228 return diff_colors[ix];
2229 return "";
2230 }
2231
2232 const char *diff_line_prefix(struct diff_options *opt)
2233 {
2234 struct strbuf *msgbuf;
2235 if (!opt->output_prefix)
2236 return "";
2237
2238 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2239 return msgbuf->buf;
2240 }
2241
2242 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2243 {
2244 const char *cp;
2245 unsigned long allot;
2246 size_t l = len;
2247
2248 cp = line;
2249 allot = l;
2250 while (0 < l) {
2251 (void) utf8_width(&cp, &l);
2252 if (!cp)
2253 break; /* truncated in the middle? */
2254 }
2255 return allot - l;
2256 }
2257
2258 static void find_lno(const char *line, struct emit_callback *ecbdata)
2259 {
2260 const char *p;
2261 ecbdata->lno_in_preimage = 0;
2262 ecbdata->lno_in_postimage = 0;
2263 p = strchr(line, '-');
2264 if (!p)
2265 return; /* cannot happen */
2266 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2267 p = strchr(p, '+');
2268 if (!p)
2269 return; /* cannot happen */
2270 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2271 }
2272
2273 static void fn_out_consume(void *priv, char *line, unsigned long len)
2274 {
2275 struct emit_callback *ecbdata = priv;
2276 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2277 struct diff_options *o = ecbdata->opt;
2278
2279 o->found_changes = 1;
2280
2281 if (ecbdata->header) {
2282 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2283 ecbdata->header->buf, ecbdata->header->len, 0);
2284 strbuf_reset(ecbdata->header);
2285 ecbdata->header = NULL;
2286 }
2287
2288 if (ecbdata->label_path[0]) {
2289 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2290 ecbdata->label_path[0],
2291 strlen(ecbdata->label_path[0]), 0);
2292 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2293 ecbdata->label_path[1],
2294 strlen(ecbdata->label_path[1]), 0);
2295 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2296 }
2297
2298 if (diff_suppress_blank_empty
2299 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2300 line[0] = '\n';
2301 len = 1;
2302 }
2303
2304 if (line[0] == '@') {
2305 if (ecbdata->diff_words)
2306 diff_words_flush(ecbdata);
2307 len = sane_truncate_line(ecbdata, line, len);
2308 find_lno(line, ecbdata);
2309 emit_hunk_header(ecbdata, line, len);
2310 return;
2311 }
2312
2313 if (ecbdata->diff_words) {
2314 enum diff_symbol s =
2315 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2316 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2317 if (line[0] == '-') {
2318 diff_words_append(line, len,
2319 &ecbdata->diff_words->minus);
2320 return;
2321 } else if (line[0] == '+') {
2322 diff_words_append(line, len,
2323 &ecbdata->diff_words->plus);
2324 return;
2325 } else if (starts_with(line, "\\ ")) {
2326 /*
2327 * Eat the "no newline at eof" marker as if we
2328 * saw a "+" or "-" line with nothing on it,
2329 * and return without diff_words_flush() to
2330 * defer processing. If this is the end of
2331 * preimage, more "+" lines may come after it.
2332 */
2333 return;
2334 }
2335 diff_words_flush(ecbdata);
2336 emit_diff_symbol(o, s, line, len, 0);
2337 return;
2338 }
2339
2340 switch (line[0]) {
2341 case '+':
2342 ecbdata->lno_in_postimage++;
2343 emit_add_line(reset, ecbdata, line + 1, len - 1);
2344 break;
2345 case '-':
2346 ecbdata->lno_in_preimage++;
2347 emit_del_line(reset, ecbdata, line + 1, len - 1);
2348 break;
2349 case ' ':
2350 ecbdata->lno_in_postimage++;
2351 ecbdata->lno_in_preimage++;
2352 emit_context_line(reset, ecbdata, line + 1, len - 1);
2353 break;
2354 default:
2355 /* incomplete line at the end */
2356 ecbdata->lno_in_preimage++;
2357 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2358 line, len, 0);
2359 break;
2360 }
2361 }
2362
2363 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2364 {
2365 const char *old_name = a;
2366 const char *new_name = b;
2367 int pfx_length, sfx_length;
2368 int pfx_adjust_for_slash;
2369 int len_a = strlen(a);
2370 int len_b = strlen(b);
2371 int a_midlen, b_midlen;
2372 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2373 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2374
2375 if (qlen_a || qlen_b) {
2376 quote_c_style(a, name, NULL, 0);
2377 strbuf_addstr(name, " => ");
2378 quote_c_style(b, name, NULL, 0);
2379 return;
2380 }
2381
2382 /* Find common prefix */
2383 pfx_length = 0;
2384 while (*old_name && *new_name && *old_name == *new_name) {
2385 if (*old_name == '/')
2386 pfx_length = old_name - a + 1;
2387 old_name++;
2388 new_name++;
2389 }
2390
2391 /* Find common suffix */
2392 old_name = a + len_a;
2393 new_name = b + len_b;
2394 sfx_length = 0;
2395 /*
2396 * If there is a common prefix, it must end in a slash. In
2397 * that case we let this loop run 1 into the prefix to see the
2398 * same slash.
2399 *
2400 * If there is no common prefix, we cannot do this as it would
2401 * underrun the input strings.
2402 */
2403 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2404 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2405 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2406 *old_name == *new_name) {
2407 if (*old_name == '/')
2408 sfx_length = len_a - (old_name - a);
2409 old_name--;
2410 new_name--;
2411 }
2412
2413 /*
2414 * pfx{mid-a => mid-b}sfx
2415 * {pfx-a => pfx-b}sfx
2416 * pfx{sfx-a => sfx-b}
2417 * name-a => name-b
2418 */
2419 a_midlen = len_a - pfx_length - sfx_length;
2420 b_midlen = len_b - pfx_length - sfx_length;
2421 if (a_midlen < 0)
2422 a_midlen = 0;
2423 if (b_midlen < 0)
2424 b_midlen = 0;
2425
2426 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2427 if (pfx_length + sfx_length) {
2428 strbuf_add(name, a, pfx_length);
2429 strbuf_addch(name, '{');
2430 }
2431 strbuf_add(name, a + pfx_length, a_midlen);
2432 strbuf_addstr(name, " => ");
2433 strbuf_add(name, b + pfx_length, b_midlen);
2434 if (pfx_length + sfx_length) {
2435 strbuf_addch(name, '}');
2436 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2437 }
2438 }
2439
2440 struct diffstat_t {
2441 int nr;
2442 int alloc;
2443 struct diffstat_file {
2444 char *from_name;
2445 char *name;
2446 char *print_name;
2447 const char *comments;
2448 unsigned is_unmerged:1;
2449 unsigned is_binary:1;
2450 unsigned is_renamed:1;
2451 unsigned is_interesting:1;
2452 uintmax_t added, deleted;
2453 } **files;
2454 };
2455
2456 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2457 const char *name_a,
2458 const char *name_b)
2459 {
2460 struct diffstat_file *x;
2461 x = xcalloc(1, sizeof(*x));
2462 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2463 diffstat->files[diffstat->nr++] = x;
2464 if (name_b) {
2465 x->from_name = xstrdup(name_a);
2466 x->name = xstrdup(name_b);
2467 x->is_renamed = 1;
2468 }
2469 else {
2470 x->from_name = NULL;
2471 x->name = xstrdup(name_a);
2472 }
2473 return x;
2474 }
2475
2476 static void diffstat_consume(void *priv, char *line, unsigned long len)
2477 {
2478 struct diffstat_t *diffstat = priv;
2479 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2480
2481 if (line[0] == '+')
2482 x->added++;
2483 else if (line[0] == '-')
2484 x->deleted++;
2485 }
2486
2487 const char mime_boundary_leader[] = "------------";
2488
2489 static int scale_linear(int it, int width, int max_change)
2490 {
2491 if (!it)
2492 return 0;
2493 /*
2494 * make sure that at least one '-' or '+' is printed if
2495 * there is any change to this path. The easiest way is to
2496 * scale linearly as if the alloted width is one column shorter
2497 * than it is, and then add 1 to the result.
2498 */
2499 return 1 + (it * (width - 1) / max_change);
2500 }
2501
2502 static void show_graph(struct strbuf *out, char ch, int cnt,
2503 const char *set, const char *reset)
2504 {
2505 if (cnt <= 0)
2506 return;
2507 strbuf_addstr(out, set);
2508 strbuf_addchars(out, ch, cnt);
2509 strbuf_addstr(out, reset);
2510 }
2511
2512 static void fill_print_name(struct diffstat_file *file)
2513 {
2514 struct strbuf pname = STRBUF_INIT;
2515
2516 if (file->print_name)
2517 return;
2518
2519 if (file->is_renamed)
2520 pprint_rename(&pname, file->from_name, file->name);
2521 else
2522 quote_c_style(file->name, &pname, NULL, 0);
2523
2524 if (file->comments)
2525 strbuf_addf(&pname, " (%s)", file->comments);
2526
2527 file->print_name = strbuf_detach(&pname, NULL);
2528 }
2529
2530 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2531 int files, int insertions, int deletions)
2532 {
2533 struct strbuf sb = STRBUF_INIT;
2534
2535 if (!files) {
2536 assert(insertions == 0 && deletions == 0);
2537 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2538 NULL, 0, 0);
2539 return;
2540 }
2541
2542 strbuf_addf(&sb,
2543 (files == 1) ? " %d file changed" : " %d files changed",
2544 files);
2545
2546 /*
2547 * For binary diff, the caller may want to print "x files
2548 * changed" with insertions == 0 && deletions == 0.
2549 *
2550 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2551 * is probably less confusing (i.e skip over "2 files changed
2552 * but nothing about added/removed lines? Is this a bug in Git?").
2553 */
2554 if (insertions || deletions == 0) {
2555 strbuf_addf(&sb,
2556 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2557 insertions);
2558 }
2559
2560 if (deletions || insertions == 0) {
2561 strbuf_addf(&sb,
2562 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2563 deletions);
2564 }
2565 strbuf_addch(&sb, '\n');
2566 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2567 sb.buf, sb.len, 0);
2568 strbuf_release(&sb);
2569 }
2570
2571 void print_stat_summary(FILE *fp, int files,
2572 int insertions, int deletions)
2573 {
2574 struct diff_options o;
2575 memset(&o, 0, sizeof(o));
2576 o.file = fp;
2577
2578 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2579 }
2580
2581 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2582 {
2583 int i, len, add, del, adds = 0, dels = 0;
2584 uintmax_t max_change = 0, max_len = 0;
2585 int total_files = data->nr, count;
2586 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2587 const char *reset, *add_c, *del_c;
2588 int extra_shown = 0;
2589 const char *line_prefix = diff_line_prefix(options);
2590 struct strbuf out = STRBUF_INIT;
2591
2592 if (data->nr == 0)
2593 return;
2594
2595 count = options->stat_count ? options->stat_count : data->nr;
2596
2597 reset = diff_get_color_opt(options, DIFF_RESET);
2598 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2599 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2600
2601 /*
2602 * Find the longest filename and max number of changes
2603 */
2604 for (i = 0; (i < count) && (i < data->nr); i++) {
2605 struct diffstat_file *file = data->files[i];
2606 uintmax_t change = file->added + file->deleted;
2607
2608 if (!file->is_interesting && (change == 0)) {
2609 count++; /* not shown == room for one more */
2610 continue;
2611 }
2612 fill_print_name(file);
2613 len = strlen(file->print_name);
2614 if (max_len < len)
2615 max_len = len;
2616
2617 if (file->is_unmerged) {
2618 /* "Unmerged" is 8 characters */
2619 bin_width = bin_width < 8 ? 8 : bin_width;
2620 continue;
2621 }
2622 if (file->is_binary) {
2623 /* "Bin XXX -> YYY bytes" */
2624 int w = 14 + decimal_width(file->added)
2625 + decimal_width(file->deleted);
2626 bin_width = bin_width < w ? w : bin_width;
2627 /* Display change counts aligned with "Bin" */
2628 number_width = 3;
2629 continue;
2630 }
2631
2632 if (max_change < change)
2633 max_change = change;
2634 }
2635 count = i; /* where we can stop scanning in data->files[] */
2636
2637 /*
2638 * We have width = stat_width or term_columns() columns total.
2639 * We want a maximum of min(max_len, stat_name_width) for the name part.
2640 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2641 * We also need 1 for " " and 4 + decimal_width(max_change)
2642 * for " | NNNN " and one the empty column at the end, altogether
2643 * 6 + decimal_width(max_change).
2644 *
2645 * If there's not enough space, we will use the smaller of
2646 * stat_name_width (if set) and 5/8*width for the filename,
2647 * and the rest for constant elements + graph part, but no more
2648 * than stat_graph_width for the graph part.
2649 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2650 * for the standard terminal size).
2651 *
2652 * In other words: stat_width limits the maximum width, and
2653 * stat_name_width fixes the maximum width of the filename,
2654 * and is also used to divide available columns if there
2655 * aren't enough.
2656 *
2657 * Binary files are displayed with "Bin XXX -> YYY bytes"
2658 * instead of the change count and graph. This part is treated
2659 * similarly to the graph part, except that it is not
2660 * "scaled". If total width is too small to accommodate the
2661 * guaranteed minimum width of the filename part and the
2662 * separators and this message, this message will "overflow"
2663 * making the line longer than the maximum width.
2664 */
2665
2666 if (options->stat_width == -1)
2667 width = term_columns() - strlen(line_prefix);
2668 else
2669 width = options->stat_width ? options->stat_width : 80;
2670 number_width = decimal_width(max_change) > number_width ?
2671 decimal_width(max_change) : number_width;
2672
2673 if (options->stat_graph_width == -1)
2674 options->stat_graph_width = diff_stat_graph_width;
2675
2676 /*
2677 * Guarantee 3/8*16==6 for the graph part
2678 * and 5/8*16==10 for the filename part
2679 */
2680 if (width < 16 + 6 + number_width)
2681 width = 16 + 6 + number_width;
2682
2683 /*
2684 * First assign sizes that are wanted, ignoring available width.
2685 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2686 * starting from "XXX" should fit in graph_width.
2687 */
2688 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2689 if (options->stat_graph_width &&
2690 options->stat_graph_width < graph_width)
2691 graph_width = options->stat_graph_width;
2692
2693 name_width = (options->stat_name_width > 0 &&
2694 options->stat_name_width < max_len) ?
2695 options->stat_name_width : max_len;
2696
2697 /*
2698 * Adjust adjustable widths not to exceed maximum width
2699 */
2700 if (name_width + number_width + 6 + graph_width > width) {
2701 if (graph_width > width * 3/8 - number_width - 6) {
2702 graph_width = width * 3/8 - number_width - 6;
2703 if (graph_width < 6)
2704 graph_width = 6;
2705 }
2706
2707 if (options->stat_graph_width &&
2708 graph_width > options->stat_graph_width)
2709 graph_width = options->stat_graph_width;
2710 if (name_width > width - number_width - 6 - graph_width)
2711 name_width = width - number_width - 6 - graph_width;
2712 else
2713 graph_width = width - number_width - 6 - name_width;
2714 }
2715
2716 /*
2717 * From here name_width is the width of the name area,
2718 * and graph_width is the width of the graph area.
2719 * max_change is used to scale graph properly.
2720 */
2721 for (i = 0; i < count; i++) {
2722 const char *prefix = "";
2723 struct diffstat_file *file = data->files[i];
2724 char *name = file->print_name;
2725 uintmax_t added = file->added;
2726 uintmax_t deleted = file->deleted;
2727 int name_len;
2728
2729 if (!file->is_interesting && (added + deleted == 0))
2730 continue;
2731
2732 /*
2733 * "scale" the filename
2734 */
2735 len = name_width;
2736 name_len = strlen(name);
2737 if (name_width < name_len) {
2738 char *slash;
2739 prefix = "...";
2740 len -= 3;
2741 name += name_len - len;
2742 slash = strchr(name, '/');
2743 if (slash)
2744 name = slash;
2745 }
2746
2747 if (file->is_binary) {
2748 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2749 strbuf_addf(&out, " %*s", number_width, "Bin");
2750 if (!added && !deleted) {
2751 strbuf_addch(&out, '\n');
2752 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2753 out.buf, out.len, 0);
2754 strbuf_reset(&out);
2755 continue;
2756 }
2757 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2758 del_c, deleted, reset);
2759 strbuf_addstr(&out, " -> ");
2760 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2761 add_c, added, reset);
2762 strbuf_addstr(&out, " bytes\n");
2763 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2764 out.buf, out.len, 0);
2765 strbuf_reset(&out);
2766 continue;
2767 }
2768 else if (file->is_unmerged) {
2769 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2770 strbuf_addstr(&out, " Unmerged\n");
2771 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2772 out.buf, out.len, 0);
2773 strbuf_reset(&out);
2774 continue;
2775 }
2776
2777 /*
2778 * scale the add/delete
2779 */
2780 add = added;
2781 del = deleted;
2782
2783 if (graph_width <= max_change) {
2784 int total = scale_linear(add + del, graph_width, max_change);
2785 if (total < 2 && add && del)
2786 /* width >= 2 due to the sanity check */
2787 total = 2;
2788 if (add < del) {
2789 add = scale_linear(add, graph_width, max_change);
2790 del = total - add;
2791 } else {
2792 del = scale_linear(del, graph_width, max_change);
2793 add = total - del;
2794 }
2795 }
2796 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2797 strbuf_addf(&out, " %*"PRIuMAX"%s",
2798 number_width, added + deleted,
2799 added + deleted ? " " : "");
2800 show_graph(&out, '+', add, add_c, reset);
2801 show_graph(&out, '-', del, del_c, reset);
2802 strbuf_addch(&out, '\n');
2803 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2804 out.buf, out.len, 0);
2805 strbuf_reset(&out);
2806 }
2807
2808 for (i = 0; i < data->nr; i++) {
2809 struct diffstat_file *file = data->files[i];
2810 uintmax_t added = file->added;
2811 uintmax_t deleted = file->deleted;
2812
2813 if (file->is_unmerged ||
2814 (!file->is_interesting && (added + deleted == 0))) {
2815 total_files--;
2816 continue;
2817 }
2818
2819 if (!file->is_binary) {
2820 adds += added;
2821 dels += deleted;
2822 }
2823 if (i < count)
2824 continue;
2825 if (!extra_shown)
2826 emit_diff_symbol(options,
2827 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2828 NULL, 0, 0);
2829 extra_shown = 1;
2830 }
2831
2832 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2833 strbuf_release(&out);
2834 }
2835
2836 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2837 {
2838 int i, adds = 0, dels = 0, total_files = data->nr;
2839
2840 if (data->nr == 0)
2841 return;
2842
2843 for (i = 0; i < data->nr; i++) {
2844 int added = data->files[i]->added;
2845 int deleted = data->files[i]->deleted;
2846
2847 if (data->files[i]->is_unmerged ||
2848 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2849 total_files--;
2850 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2851 adds += added;
2852 dels += deleted;
2853 }
2854 }
2855 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2856 }
2857
2858 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2859 {
2860 int i;
2861
2862 if (data->nr == 0)
2863 return;
2864
2865 for (i = 0; i < data->nr; i++) {
2866 struct diffstat_file *file = data->files[i];
2867
2868 fprintf(options->file, "%s", diff_line_prefix(options));
2869
2870 if (file->is_binary)
2871 fprintf(options->file, "-\t-\t");
2872 else
2873 fprintf(options->file,
2874 "%"PRIuMAX"\t%"PRIuMAX"\t",
2875 file->added, file->deleted);
2876 if (options->line_termination) {
2877 fill_print_name(file);
2878 if (!file->is_renamed)
2879 write_name_quoted(file->name, options->file,
2880 options->line_termination);
2881 else {
2882 fputs(file->print_name, options->file);
2883 putc(options->line_termination, options->file);
2884 }
2885 } else {
2886 if (file->is_renamed) {
2887 putc('\0', options->file);
2888 write_name_quoted(file->from_name, options->file, '\0');
2889 }
2890 write_name_quoted(file->name, options->file, '\0');
2891 }
2892 }
2893 }
2894
2895 struct dirstat_file {
2896 const char *name;
2897 unsigned long changed;
2898 };
2899
2900 struct dirstat_dir {
2901 struct dirstat_file *files;
2902 int alloc, nr, permille, cumulative;
2903 };
2904
2905 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2906 unsigned long changed, const char *base, int baselen)
2907 {
2908 unsigned long sum_changes = 0;
2909 unsigned int sources = 0;
2910 const char *line_prefix = diff_line_prefix(opt);
2911
2912 while (dir->nr) {
2913 struct dirstat_file *f = dir->files;
2914 int namelen = strlen(f->name);
2915 unsigned long changes;
2916 char *slash;
2917
2918 if (namelen < baselen)
2919 break;
2920 if (memcmp(f->name, base, baselen))
2921 break;
2922 slash = strchr(f->name + baselen, '/');
2923 if (slash) {
2924 int newbaselen = slash + 1 - f->name;
2925 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2926 sources++;
2927 } else {
2928 changes = f->changed;
2929 dir->files++;
2930 dir->nr--;
2931 sources += 2;
2932 }
2933 sum_changes += changes;
2934 }
2935
2936 /*
2937 * We don't report dirstat's for
2938 * - the top level
2939 * - or cases where everything came from a single directory
2940 * under this directory (sources == 1).
2941 */
2942 if (baselen && sources != 1) {
2943 if (sum_changes) {
2944 int permille = sum_changes * 1000 / changed;
2945 if (permille >= dir->permille) {
2946 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2947 permille / 10, permille % 10, baselen, base);
2948 if (!dir->cumulative)
2949 return 0;
2950 }
2951 }
2952 }
2953 return sum_changes;
2954 }
2955
2956 static int dirstat_compare(const void *_a, const void *_b)
2957 {
2958 const struct dirstat_file *a = _a;
2959 const struct dirstat_file *b = _b;
2960 return strcmp(a->name, b->name);
2961 }
2962
2963 static void show_dirstat(struct diff_options *options)
2964 {
2965 int i;
2966 unsigned long changed;
2967 struct dirstat_dir dir;
2968 struct diff_queue_struct *q = &diff_queued_diff;
2969
2970 dir.files = NULL;
2971 dir.alloc = 0;
2972 dir.nr = 0;
2973 dir.permille = options->dirstat_permille;
2974 dir.cumulative = options->flags.dirstat_cumulative;
2975
2976 changed = 0;
2977 for (i = 0; i < q->nr; i++) {
2978 struct diff_filepair *p = q->queue[i];
2979 const char *name;
2980 unsigned long copied, added, damage;
2981
2982 name = p->two->path ? p->two->path : p->one->path;
2983
2984 if (p->one->oid_valid && p->two->oid_valid &&
2985 oideq(&p->one->oid, &p->two->oid)) {
2986 /*
2987 * The SHA1 has not changed, so pre-/post-content is
2988 * identical. We can therefore skip looking at the
2989 * file contents altogether.
2990 */
2991 damage = 0;
2992 goto found_damage;
2993 }
2994
2995 if (options->flags.dirstat_by_file) {
2996 /*
2997 * In --dirstat-by-file mode, we don't really need to
2998 * look at the actual file contents at all.
2999 * The fact that the SHA1 changed is enough for us to
3000 * add this file to the list of results
3001 * (with each file contributing equal damage).
3002 */
3003 damage = 1;
3004 goto found_damage;
3005 }
3006
3007 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
3008 diff_populate_filespec(options->repo, p->one, 0);
3009 diff_populate_filespec(options->repo, p->two, 0);
3010 diffcore_count_changes(options->repo,
3011 p->one, p->two, NULL, NULL,
3012 &copied, &added);
3013 diff_free_filespec_data(p->one);
3014 diff_free_filespec_data(p->two);
3015 } else if (DIFF_FILE_VALID(p->one)) {
3016 diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
3017 copied = added = 0;
3018 diff_free_filespec_data(p->one);
3019 } else if (DIFF_FILE_VALID(p->two)) {
3020 diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
3021 copied = 0;
3022 added = p->two->size;
3023 diff_free_filespec_data(p->two);
3024 } else
3025 continue;
3026
3027 /*
3028 * Original minus copied is the removed material,
3029 * added is the new material. They are both damages
3030 * made to the preimage.
3031 * If the resulting damage is zero, we know that
3032 * diffcore_count_changes() considers the two entries to
3033 * be identical, but since the oid changed, we
3034 * know that there must have been _some_ kind of change,
3035 * so we force all entries to have damage > 0.
3036 */
3037 damage = (p->one->size - copied) + added;
3038 if (!damage)
3039 damage = 1;
3040
3041 found_damage:
3042 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3043 dir.files[dir.nr].name = name;
3044 dir.files[dir.nr].changed = damage;
3045 changed += damage;
3046 dir.nr++;
3047 }
3048
3049 /* This can happen even with many files, if everything was renames */
3050 if (!changed)
3051 return;
3052
3053 /* Show all directories with more than x% of the changes */
3054 QSORT(dir.files, dir.nr, dirstat_compare);
3055 gather_dirstat(options, &dir, changed, "", 0);
3056 }
3057
3058 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3059 {
3060 int i;
3061 unsigned long changed;
3062 struct dirstat_dir dir;
3063
3064 if (data->nr == 0)
3065 return;
3066
3067 dir.files = NULL;
3068 dir.alloc = 0;
3069 dir.nr = 0;
3070 dir.permille = options->dirstat_permille;
3071 dir.cumulative = options->flags.dirstat_cumulative;
3072
3073 changed = 0;
3074 for (i = 0; i < data->nr; i++) {
3075 struct diffstat_file *file = data->files[i];
3076 unsigned long damage = file->added + file->deleted;
3077 if (file->is_binary)
3078 /*
3079 * binary files counts bytes, not lines. Must find some
3080 * way to normalize binary bytes vs. textual lines.
3081 * The following heuristic assumes that there are 64
3082 * bytes per "line".
3083 * This is stupid and ugly, but very cheap...
3084 */
3085 damage = DIV_ROUND_UP(damage, 64);
3086 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3087 dir.files[dir.nr].name = file->name;
3088 dir.files[dir.nr].changed = damage;
3089 changed += damage;
3090 dir.nr++;
3091 }
3092
3093 /* This can happen even with many files, if everything was renames */
3094 if (!changed)
3095 return;
3096
3097 /* Show all directories with more than x% of the changes */
3098 QSORT(dir.files, dir.nr, dirstat_compare);
3099 gather_dirstat(options, &dir, changed, "", 0);
3100 }
3101
3102 static void free_diffstat_info(struct diffstat_t *diffstat)
3103 {
3104 int i;
3105 for (i = 0; i < diffstat->nr; i++) {
3106 struct diffstat_file *f = diffstat->files[i];
3107 free(f->print_name);
3108 free(f->name);
3109 free(f->from_name);
3110 free(f);
3111 }
3112 free(diffstat->files);
3113 }
3114
3115 struct checkdiff_t {
3116 const char *filename;
3117 int lineno;
3118 int conflict_marker_size;
3119 struct diff_options *o;
3120 unsigned ws_rule;
3121 unsigned status;
3122 };
3123
3124 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3125 {
3126 char firstchar;
3127 int cnt;
3128
3129 if (len < marker_size + 1)
3130 return 0;
3131 firstchar = line[0];
3132 switch (firstchar) {
3133 case '=': case '>': case '<': case '|':
3134 break;
3135 default:
3136 return 0;
3137 }
3138 for (cnt = 1; cnt < marker_size; cnt++)
3139 if (line[cnt] != firstchar)
3140 return 0;
3141 /* line[1] thru line[marker_size-1] are same as firstchar */
3142 if (len < marker_size + 1 || !isspace(line[marker_size]))
3143 return 0;
3144 return 1;
3145 }
3146
3147 static void checkdiff_consume_hunk(void *priv,
3148 long ob, long on, long nb, long nn,
3149 const char *func, long funclen)
3150
3151 {
3152 struct checkdiff_t *data = priv;
3153 data->lineno = nb - 1;
3154 }
3155
3156 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3157 {
3158 struct checkdiff_t *data = priv;
3159 int marker_size = data->conflict_marker_size;
3160 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3161 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3162 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3163 char *err;
3164 const char *line_prefix;
3165
3166 assert(data->o);
3167 line_prefix = diff_line_prefix(data->o);
3168
3169 if (line[0] == '+') {
3170 unsigned bad;
3171 data->lineno++;
3172 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3173 data->status |= 1;
3174 fprintf(data->o->file,
3175 "%s%s:%d: leftover conflict marker\n",
3176 line_prefix, data->filename, data->lineno);
3177 }
3178 bad = ws_check(line + 1, len - 1, data->ws_rule);
3179 if (!bad)
3180 return;
3181 data->status |= bad;
3182 err = whitespace_error_string(bad);
3183 fprintf(data->o->file, "%s%s:%d: %s.\n",
3184 line_prefix, data->filename, data->lineno, err);
3185 free(err);
3186 emit_line(data->o, set, reset, line, 1);
3187 ws_check_emit(line + 1, len - 1, data->ws_rule,
3188 data->o->file, set, reset, ws);
3189 } else if (line[0] == ' ') {
3190 data->lineno++;
3191 }
3192 }
3193
3194 static unsigned char *deflate_it(char *data,
3195 unsigned long size,
3196 unsigned long *result_size)
3197 {
3198 int bound;
3199 unsigned char *deflated;
3200 git_zstream stream;
3201
3202 git_deflate_init(&stream, zlib_compression_level);
3203 bound = git_deflate_bound(&stream, size);
3204 deflated = xmalloc(bound);
3205 stream.next_out = deflated;
3206 stream.avail_out = bound;
3207
3208 stream.next_in = (unsigned char *)data;
3209 stream.avail_in = size;
3210 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3211 ; /* nothing */
3212 git_deflate_end(&stream);
3213 *result_size = stream.total_out;
3214 return deflated;
3215 }
3216
3217 static void emit_binary_diff_body(struct diff_options *o,
3218 mmfile_t *one, mmfile_t *two)
3219 {
3220 void *cp;
3221 void *delta;
3222 void *deflated;
3223 void *data;
3224 unsigned long orig_size;
3225 unsigned long delta_size;
3226 unsigned long deflate_size;
3227 unsigned long data_size;
3228
3229 /* We could do deflated delta, or we could do just deflated two,
3230 * whichever is smaller.
3231 */
3232 delta = NULL;
3233 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3234 if (one->size && two->size) {
3235 delta = diff_delta(one->ptr, one->size,
3236 two->ptr, two->size,
3237 &delta_size, deflate_size);
3238 if (delta) {
3239 void *to_free = delta;
3240 orig_size = delta_size;
3241 delta = deflate_it(delta, delta_size, &delta_size);
3242 free(to_free);
3243 }
3244 }
3245
3246 if (delta && delta_size < deflate_size) {
3247 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3248 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3249 s, strlen(s), 0);
3250 free(s);
3251 free(deflated);
3252 data = delta;
3253 data_size = delta_size;
3254 } else {
3255 char *s = xstrfmt("%lu", two->size);
3256 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3257 s, strlen(s), 0);
3258 free(s);
3259 free(delta);
3260 data = deflated;
3261 data_size = deflate_size;
3262 }
3263
3264 /* emit data encoded in base85 */
3265 cp = data;
3266 while (data_size) {
3267 int len;
3268 int bytes = (52 < data_size) ? 52 : data_size;
3269 char line[71];
3270 data_size -= bytes;
3271 if (bytes <= 26)
3272 line[0] = bytes + 'A' - 1;
3273 else
3274 line[0] = bytes - 26 + 'a' - 1;
3275 encode_85(line + 1, cp, bytes);
3276 cp = (char *) cp + bytes;
3277
3278 len = strlen(line);
3279 line[len++] = '\n';
3280 line[len] = '\0';
3281
3282 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3283 line, len, 0);
3284 }
3285 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3286 free(data);
3287 }
3288
3289 static void emit_binary_diff(struct diff_options *o,
3290 mmfile_t *one, mmfile_t *two)
3291 {
3292 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3293 emit_binary_diff_body(o, one, two);
3294 emit_binary_diff_body(o, two, one);
3295 }
3296
3297 int diff_filespec_is_binary(struct repository *r,
3298 struct diff_filespec *one)
3299 {
3300 if (one->is_binary == -1) {
3301 diff_filespec_load_driver(one, r->index);
3302 if (one->driver->binary != -1)
3303 one->is_binary = one->driver->binary;
3304 else {
3305 if (!one->data && DIFF_FILE_VALID(one))
3306 diff_populate_filespec(r, one, CHECK_BINARY);
3307 if (one->is_binary == -1 && one->data)
3308 one->is_binary = buffer_is_binary(one->data,
3309 one->size);
3310 if (one->is_binary == -1)
3311 one->is_binary = 0;
3312 }
3313 }
3314 return one->is_binary;
3315 }
3316
3317 static const struct userdiff_funcname *
3318 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3319 {
3320 diff_filespec_load_driver(one, o->repo->index);
3321 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3322 }
3323
3324 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3325 {
3326 if (!options->a_prefix)
3327 options->a_prefix = a;
3328 if (!options->b_prefix)
3329 options->b_prefix = b;
3330 }
3331
3332 struct userdiff_driver *get_textconv(struct index_state *istate,
3333 struct diff_filespec *one)
3334 {
3335 if (!DIFF_FILE_VALID(one))
3336 return NULL;
3337
3338 diff_filespec_load_driver(one, istate);
3339 return userdiff_get_textconv(one->driver);
3340 }
3341
3342 static void builtin_diff(const char *name_a,
3343 const char *name_b,
3344 struct diff_filespec *one,
3345 struct diff_filespec *two,
3346 const char *xfrm_msg,
3347 int must_show_header,
3348 struct diff_options *o,
3349 int complete_rewrite)
3350 {
3351 mmfile_t mf1, mf2;
3352 const char *lbl[2];
3353 char *a_one, *b_two;
3354 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3355 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3356 const char *a_prefix, *b_prefix;
3357 struct userdiff_driver *textconv_one = NULL;
3358 struct userdiff_driver *textconv_two = NULL;
3359 struct strbuf header = STRBUF_INIT;
3360 const char *line_prefix = diff_line_prefix(o);
3361
3362 diff_set_mnemonic_prefix(o, "a/", "b/");
3363 if (o->flags.reverse_diff) {
3364 a_prefix = o->b_prefix;
3365 b_prefix = o->a_prefix;
3366 } else {
3367 a_prefix = o->a_prefix;
3368 b_prefix = o->b_prefix;
3369 }
3370
3371 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3372 (!one->mode || S_ISGITLINK(one->mode)) &&
3373 (!two->mode || S_ISGITLINK(two->mode))) {
3374 show_submodule_summary(o, one->path ? one->path : two->path,
3375 &one->oid, &two->oid,
3376 two->dirty_submodule);
3377 return;
3378 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3379 (!one->mode || S_ISGITLINK(one->mode)) &&
3380 (!two->mode || S_ISGITLINK(two->mode))) {
3381 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3382 &one->oid, &two->oid,
3383 two->dirty_submodule);
3384 return;
3385 }
3386
3387 if (o->flags.allow_textconv) {
3388 textconv_one = get_textconv(o->repo->index, one);
3389 textconv_two = get_textconv(o->repo->index, two);
3390 }
3391
3392 /* Never use a non-valid filename anywhere if at all possible */
3393 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3394 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3395
3396 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3397 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3398 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3399 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3400 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3401 if (lbl[0][0] == '/') {
3402 /* /dev/null */
3403 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3404 if (xfrm_msg)
3405 strbuf_addstr(&header, xfrm_msg);
3406 must_show_header = 1;
3407 }
3408 else if (lbl[1][0] == '/') {
3409 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3410 if (xfrm_msg)
3411 strbuf_addstr(&header, xfrm_msg);
3412 must_show_header = 1;
3413 }
3414 else {
3415 if (one->mode != two->mode) {
3416 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3417 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3418 must_show_header = 1;
3419 }
3420 if (xfrm_msg)
3421 strbuf_addstr(&header, xfrm_msg);
3422
3423 /*
3424 * we do not run diff between different kind
3425 * of objects.
3426 */
3427 if ((one->mode ^ two->mode) & S_IFMT)
3428 goto free_ab_and_return;
3429 if (complete_rewrite &&
3430 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3431 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3432 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3433 header.buf, header.len, 0);
3434 strbuf_reset(&header);
3435 emit_rewrite_diff(name_a, name_b, one, two,
3436 textconv_one, textconv_two, o);
3437 o->found_changes = 1;
3438 goto free_ab_and_return;
3439 }
3440 }
3441
3442 if (o->irreversible_delete && lbl[1][0] == '/') {
3443 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3444 header.len, 0);
3445 strbuf_reset(&header);
3446 goto free_ab_and_return;
3447 } else if (!o->flags.text &&
3448 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3449 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3450 struct strbuf sb = STRBUF_INIT;
3451 if (!one->data && !two->data &&
3452 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3453 !o->flags.binary) {
3454 if (oideq(&one->oid, &two->oid)) {
3455 if (must_show_header)
3456 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3457 header.buf, header.len,
3458 0);
3459 goto free_ab_and_return;
3460 }
3461 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3462 header.buf, header.len, 0);
3463 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3464 diff_line_prefix(o), lbl[0], lbl[1]);
3465 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3466 sb.buf, sb.len, 0);
3467 strbuf_release(&sb);
3468 goto free_ab_and_return;
3469 }
3470 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3471 fill_mmfile(o->repo, &mf2, two) < 0)
3472 die("unable to read files to diff");
3473 /* Quite common confusing case */
3474 if (mf1.size == mf2.size &&
3475 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3476 if (must_show_header)
3477 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3478 header.buf, header.len, 0);
3479 goto free_ab_and_return;
3480 }
3481 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3482 strbuf_reset(&header);
3483 if (o->flags.binary)
3484 emit_binary_diff(o, &mf1, &mf2);
3485 else {
3486 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3487 diff_line_prefix(o), lbl[0], lbl[1]);
3488 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3489 sb.buf, sb.len, 0);
3490 strbuf_release(&sb);
3491 }
3492 o->found_changes = 1;
3493 } else {
3494 /* Crazy xdl interfaces.. */
3495 const char *diffopts = getenv("GIT_DIFF_OPTS");
3496 const char *v;
3497 xpparam_t xpp;
3498 xdemitconf_t xecfg;
3499 struct emit_callback ecbdata;
3500 const struct userdiff_funcname *pe;
3501
3502 if (must_show_header) {
3503 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3504 header.buf, header.len, 0);
3505 strbuf_reset(&header);
3506 }
3507
3508 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3509 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3510
3511 pe = diff_funcname_pattern(o, one);
3512 if (!pe)
3513 pe = diff_funcname_pattern(o, two);
3514
3515 memset(&xpp, 0, sizeof(xpp));
3516 memset(&xecfg, 0, sizeof(xecfg));
3517 memset(&ecbdata, 0, sizeof(ecbdata));
3518 if (o->flags.suppress_diff_headers)
3519 lbl[0] = NULL;
3520 ecbdata.label_path = lbl;
3521 ecbdata.color_diff = want_color(o->use_color);
3522 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3523 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3524 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3525 ecbdata.opt = o;
3526 if (header.len && !o->flags.suppress_diff_headers)
3527 ecbdata.header = &header;
3528 xpp.flags = o->xdl_opts;
3529 xpp.anchors = o->anchors;
3530 xpp.anchors_nr = o->anchors_nr;
3531 xecfg.ctxlen = o->context;
3532 xecfg.interhunkctxlen = o->interhunkcontext;
3533 xecfg.flags = XDL_EMIT_FUNCNAMES;
3534 if (o->flags.funccontext)
3535 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3536 if (pe)
3537 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3538 if (!diffopts)
3539 ;
3540 else if (skip_prefix(diffopts, "--unified=", &v))
3541 xecfg.ctxlen = strtoul(v, NULL, 10);
3542 else if (skip_prefix(diffopts, "-u", &v))
3543 xecfg.ctxlen = strtoul(v, NULL, 10);
3544 if (o->word_diff)
3545 init_diff_words_data(&ecbdata, o, one, two);
3546 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3547 &ecbdata, &xpp, &xecfg))
3548 die("unable to generate diff for %s", one->path);
3549 if (o->word_diff)
3550 free_diff_words_data(&ecbdata);
3551 if (textconv_one)
3552 free(mf1.ptr);
3553 if (textconv_two)
3554 free(mf2.ptr);
3555 xdiff_clear_find_func(&xecfg);
3556 }
3557
3558 free_ab_and_return:
3559 strbuf_release(&header);
3560 diff_free_filespec_data(one);
3561 diff_free_filespec_data(two);
3562 free(a_one);
3563 free(b_two);
3564 return;
3565 }
3566
3567 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3568 {
3569 if (!is_renamed) {
3570 if (p->status == DIFF_STATUS_ADDED) {
3571 if (S_ISLNK(p->two->mode))
3572 return "new +l";
3573 else if ((p->two->mode & 0777) == 0755)
3574 return "new +x";
3575 else
3576 return "new";
3577 } else if (p->status == DIFF_STATUS_DELETED)
3578 return "gone";
3579 }
3580 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3581 return "mode -l";
3582 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3583 return "mode +l";
3584 else if ((p->one->mode & 0777) == 0644 &&
3585 (p->two->mode & 0777) == 0755)
3586 return "mode +x";
3587 else if ((p->one->mode & 0777) == 0755 &&
3588 (p->two->mode & 0777) == 0644)
3589 return "mode -x";
3590 return NULL;
3591 }
3592
3593 static void builtin_diffstat(const char *name_a, const char *name_b,
3594 struct diff_filespec *one,
3595 struct diff_filespec *two,
3596 struct diffstat_t *diffstat,
3597 struct diff_options *o,
3598 struct diff_filepair *p)
3599 {
3600 mmfile_t mf1, mf2;
3601 struct diffstat_file *data;
3602 int same_contents;
3603 int complete_rewrite = 0;
3604
3605 if (!DIFF_PAIR_UNMERGED(p)) {
3606 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3607 complete_rewrite = 1;
3608 }
3609
3610 data = diffstat_add(diffstat, name_a, name_b);
3611 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3612 if (o->flags.stat_with_summary)
3613 data->comments = get_compact_summary(p, data->is_renamed);
3614
3615 if (!one || !two) {
3616 data->is_unmerged = 1;
3617 return;
3618 }
3619
3620 same_contents = oideq(&one->oid, &two->oid);
3621
3622 if (diff_filespec_is_binary(o->repo, one) ||
3623 diff_filespec_is_binary(o->repo, two)) {
3624 data->is_binary = 1;
3625 if (same_contents) {
3626 data->added = 0;
3627 data->deleted = 0;
3628 } else {
3629 data->added = diff_filespec_size(o->repo, two);
3630 data->deleted = diff_filespec_size(o->repo, one);
3631 }
3632 }
3633
3634 else if (complete_rewrite) {
3635 diff_populate_filespec(o->repo, one, 0);
3636 diff_populate_filespec(o->repo, two, 0);
3637 data->deleted = count_lines(one->data, one->size);
3638 data->added = count_lines(two->data, two->size);
3639 }
3640
3641 else if (!same_contents) {
3642 /* Crazy xdl interfaces.. */
3643 xpparam_t xpp;
3644 xdemitconf_t xecfg;
3645
3646 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3647 fill_mmfile(o->repo, &mf2, two) < 0)
3648 die("unable to read files to diff");
3649
3650 memset(&xpp, 0, sizeof(xpp));
3651 memset(&xecfg, 0, sizeof(xecfg));
3652 xpp.flags = o->xdl_opts;
3653 xpp.anchors = o->anchors;
3654 xpp.anchors_nr = o->anchors_nr;
3655 xecfg.ctxlen = o->context;
3656 xecfg.interhunkctxlen = o->interhunkcontext;
3657 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
3658 diffstat_consume, diffstat, &xpp, &xecfg))
3659 die("unable to generate diffstat for %s", one->path);
3660 }
3661
3662 diff_free_filespec_data(one);
3663 diff_free_filespec_data(two);
3664 }
3665
3666 static void builtin_checkdiff(const char *name_a, const char *name_b,
3667 const char *attr_path,
3668 struct diff_filespec *one,
3669 struct diff_filespec *two,
3670 struct diff_options *o)
3671 {
3672 mmfile_t mf1, mf2;
3673 struct checkdiff_t data;
3674
3675 if (!two)
3676 return;
3677
3678 memset(&data, 0, sizeof(data));
3679 data.filename = name_b ? name_b : name_a;
3680 data.lineno = 0;
3681 data.o = o;
3682 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3683 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3684
3685 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3686 fill_mmfile(o->repo, &mf2, two) < 0)
3687 die("unable to read files to diff");
3688
3689 /*
3690 * All the other codepaths check both sides, but not checking
3691 * the "old" side here is deliberate. We are checking the newly
3692 * introduced changes, and as long as the "new" side is text, we
3693 * can and should check what it introduces.
3694 */
3695 if (diff_filespec_is_binary(o->repo, two))
3696 goto free_and_return;
3697 else {
3698 /* Crazy xdl interfaces.. */
3699 xpparam_t xpp;
3700 xdemitconf_t xecfg;
3701
3702 memset(&xpp, 0, sizeof(xpp));
3703 memset(&xecfg, 0, sizeof(xecfg));
3704 xecfg.ctxlen = 1; /* at least one context line */
3705 xpp.flags = 0;
3706 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3707 checkdiff_consume, &data,
3708 &xpp, &xecfg))
3709 die("unable to generate checkdiff for %s", one->path);
3710
3711 if (data.ws_rule & WS_BLANK_AT_EOF) {
3712 struct emit_callback ecbdata;
3713 int blank_at_eof;
3714
3715 ecbdata.ws_rule = data.ws_rule;
3716 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3717 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3718
3719 if (blank_at_eof) {
3720 static char *err;
3721 if (!err)
3722 err = whitespace_error_string(WS_BLANK_AT_EOF);
3723 fprintf(o->file, "%s:%d: %s.\n",
3724 data.filename, blank_at_eof, err);
3725 data.status = 1; /* report errors */
3726 }
3727 }
3728 }
3729 free_and_return:
3730 diff_free_filespec_data(one);
3731 diff_free_filespec_data(two);
3732 if (data.status)
3733 o->flags.check_failed = 1;
3734 }
3735
3736 struct diff_filespec *alloc_filespec(const char *path)
3737 {
3738 struct diff_filespec *spec;
3739
3740 FLEXPTR_ALLOC_STR(spec, path, path);
3741 spec->count = 1;
3742 spec->is_binary = -1;
3743 return spec;
3744 }
3745
3746 void free_filespec(struct diff_filespec *spec)
3747 {
3748 if (!--spec->count) {
3749 diff_free_filespec_data(spec);
3750 free(spec);
3751 }
3752 }
3753
3754 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3755 int oid_valid, unsigned short mode)
3756 {
3757 if (mode) {
3758 spec->mode = canon_mode(mode);
3759 oidcpy(&spec->oid, oid);
3760 spec->oid_valid = oid_valid;
3761 }
3762 }
3763
3764 /*
3765 * Given a name and sha1 pair, if the index tells us the file in
3766 * the work tree has that object contents, return true, so that
3767 * prepare_temp_file() does not have to inflate and extract.
3768 */
3769 static int reuse_worktree_file(struct index_state *istate,
3770 const char *name,
3771 const struct object_id *oid,
3772 int want_file)
3773 {
3774 const struct cache_entry *ce;
3775 struct stat st;
3776 int pos, len;
3777
3778 /*
3779 * We do not read the cache ourselves here, because the
3780 * benchmark with my previous version that always reads cache
3781 * shows that it makes things worse for diff-tree comparing
3782 * two linux-2.6 kernel trees in an already checked out work
3783 * tree. This is because most diff-tree comparisons deal with
3784 * only a small number of files, while reading the cache is
3785 * expensive for a large project, and its cost outweighs the
3786 * savings we get by not inflating the object to a temporary
3787 * file. Practically, this code only helps when we are used
3788 * by diff-cache --cached, which does read the cache before
3789 * calling us.
3790 */
3791 if (!istate->cache)
3792 return 0;
3793
3794 /* We want to avoid the working directory if our caller
3795 * doesn't need the data in a normal file, this system
3796 * is rather slow with its stat/open/mmap/close syscalls,
3797 * and the object is contained in a pack file. The pack
3798 * is probably already open and will be faster to obtain
3799 * the data through than the working directory. Loose
3800 * objects however would tend to be slower as they need
3801 * to be individually opened and inflated.
3802 */
3803 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3804 return 0;
3805
3806 /*
3807 * Similarly, if we'd have to convert the file contents anyway, that
3808 * makes the optimization not worthwhile.
3809 */
3810 if (!want_file && would_convert_to_git(istate, name))
3811 return 0;
3812
3813 len = strlen(name);
3814 pos = index_name_pos(istate, name, len);
3815 if (pos < 0)
3816 return 0;
3817 ce = istate->cache[pos];
3818
3819 /*
3820 * This is not the sha1 we are looking for, or
3821 * unreusable because it is not a regular file.
3822 */
3823 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3824 return 0;
3825
3826 /*
3827 * If ce is marked as "assume unchanged", there is no
3828 * guarantee that work tree matches what we are looking for.
3829 */
3830 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3831 return 0;
3832
3833 /*
3834 * If ce matches the file in the work tree, we can reuse it.
3835 */
3836 if (ce_uptodate(ce) ||
3837 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3838 return 1;
3839
3840 return 0;
3841 }
3842
3843 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3844 {
3845 struct strbuf buf = STRBUF_INIT;
3846 char *dirty = "";
3847
3848 /* Are we looking at the work tree? */
3849 if (s->dirty_submodule)
3850 dirty = "-dirty";
3851
3852 strbuf_addf(&buf, "Subproject commit %s%s\n",
3853 oid_to_hex(&s->oid), dirty);
3854 s->size = buf.len;
3855 if (size_only) {
3856 s->data = NULL;
3857 strbuf_release(&buf);
3858 } else {
3859 s->data = strbuf_detach(&buf, NULL);
3860 s->should_free = 1;
3861 }
3862 return 0;
3863 }
3864
3865 /*
3866 * While doing rename detection and pickaxe operation, we may need to
3867 * grab the data for the blob (or file) for our own in-core comparison.
3868 * diff_filespec has data and size fields for this purpose.
3869 */
3870 int diff_populate_filespec(struct repository *r,
3871 struct diff_filespec *s,
3872 unsigned int flags)
3873 {
3874 int size_only = flags & CHECK_SIZE_ONLY;
3875 int err = 0;
3876 int conv_flags = global_conv_flags_eol;
3877 /*
3878 * demote FAIL to WARN to allow inspecting the situation
3879 * instead of refusing.
3880 */
3881 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3882 conv_flags = CONV_EOL_RNDTRP_WARN;
3883
3884 if (!DIFF_FILE_VALID(s))
3885 die("internal error: asking to populate invalid file.");
3886 if (S_ISDIR(s->mode))
3887 return -1;
3888
3889 if (s->data)
3890 return 0;
3891
3892 if (size_only && 0 < s->size)
3893 return 0;
3894
3895 if (S_ISGITLINK(s->mode))
3896 return diff_populate_gitlink(s, size_only);
3897
3898 if (!s->oid_valid ||
3899 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3900 struct strbuf buf = STRBUF_INIT;
3901 struct stat st;
3902 int fd;
3903
3904 if (lstat(s->path, &st) < 0) {
3905 err_empty:
3906 err = -1;
3907 empty:
3908 s->data = (char *)"";
3909 s->size = 0;
3910 return err;
3911 }
3912 s->size = xsize_t(st.st_size);
3913 if (!s->size)
3914 goto empty;
3915 if (S_ISLNK(st.st_mode)) {
3916 struct strbuf sb = STRBUF_INIT;
3917
3918 if (strbuf_readlink(&sb, s->path, s->size))
3919 goto err_empty;
3920 s->size = sb.len;
3921 s->data = strbuf_detach(&sb, NULL);
3922 s->should_free = 1;
3923 return 0;
3924 }
3925
3926 /*
3927 * Even if the caller would be happy with getting
3928 * only the size, we cannot return early at this
3929 * point if the path requires us to run the content
3930 * conversion.
3931 */
3932 if (size_only && !would_convert_to_git(r->index, s->path))
3933 return 0;
3934
3935 /*
3936 * Note: this check uses xsize_t(st.st_size) that may
3937 * not be the true size of the blob after it goes
3938 * through convert_to_git(). This may not strictly be
3939 * correct, but the whole point of big_file_threshold
3940 * and is_binary check being that we want to avoid
3941 * opening the file and inspecting the contents, this
3942 * is probably fine.
3943 */
3944 if ((flags & CHECK_BINARY) &&
3945 s->size > big_file_threshold && s->is_binary == -1) {
3946 s->is_binary = 1;
3947 return 0;
3948 }
3949 fd = open(s->path, O_RDONLY);
3950 if (fd < 0)
3951 goto err_empty;
3952 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3953 close(fd);
3954 s->should_munmap = 1;
3955
3956 /*
3957 * Convert from working tree format to canonical git format
3958 */
3959 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
3960 size_t size = 0;
3961 munmap(s->data, s->size);
3962 s->should_munmap = 0;
3963 s->data = strbuf_detach(&buf, &size);
3964 s->size = size;
3965 s->should_free = 1;
3966 }
3967 }
3968 else {
3969 enum object_type type;
3970 if (size_only || (flags & CHECK_BINARY)) {
3971 type = oid_object_info(r, &s->oid, &s->size);
3972 if (type < 0)
3973 die("unable to read %s",
3974 oid_to_hex(&s->oid));
3975 if (size_only)
3976 return 0;
3977 if (s->size > big_file_threshold && s->is_binary == -1) {
3978 s->is_binary = 1;
3979 return 0;
3980 }
3981 }
3982 s->data = read_object_file(&s->oid, &type, &s->size);
3983 if (!s->data)
3984 die("unable to read %s", oid_to_hex(&s->oid));
3985 s->should_free = 1;
3986 }
3987 return 0;
3988 }
3989
3990 void diff_free_filespec_blob(struct diff_filespec *s)
3991 {
3992 if (s->should_free)
3993 free(s->data);
3994 else if (s->should_munmap)
3995 munmap(s->data, s->size);
3996
3997 if (s->should_free || s->should_munmap) {
3998 s->should_free = s->should_munmap = 0;
3999 s->data = NULL;
4000 }
4001 }
4002
4003 void diff_free_filespec_data(struct diff_filespec *s)
4004 {
4005 diff_free_filespec_blob(s);
4006 FREE_AND_NULL(s->cnt_data);
4007 }
4008
4009 static void prep_temp_blob(struct index_state *istate,
4010 const char *path, struct diff_tempfile *temp,
4011 void *blob,
4012 unsigned long size,
4013 const struct object_id *oid,
4014 int mode)
4015 {
4016 struct strbuf buf = STRBUF_INIT;
4017 struct strbuf tempfile = STRBUF_INIT;
4018 char *path_dup = xstrdup(path);
4019 const char *base = basename(path_dup);
4020
4021 /* Generate "XXXXXX_basename.ext" */
4022 strbuf_addstr(&tempfile, "XXXXXX_");
4023 strbuf_addstr(&tempfile, base);
4024
4025 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4026 if (!temp->tempfile)
4027 die_errno("unable to create temp-file");
4028 if (convert_to_working_tree(istate, path,
4029 (const char *)blob, (size_t)size, &buf)) {
4030 blob = buf.buf;
4031 size = buf.len;
4032 }
4033 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4034 close_tempfile_gently(temp->tempfile))
4035 die_errno("unable to write temp-file");
4036 temp->name = get_tempfile_path(temp->tempfile);
4037 oid_to_hex_r(temp->hex, oid);
4038 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4039 strbuf_release(&buf);
4040 strbuf_release(&tempfile);
4041 free(path_dup);
4042 }
4043
4044 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4045 const char *name,
4046 struct diff_filespec *one)
4047 {
4048 struct diff_tempfile *temp = claim_diff_tempfile();
4049
4050 if (!DIFF_FILE_VALID(one)) {
4051 not_a_valid_file:
4052 /* A '-' entry produces this for file-2, and
4053 * a '+' entry produces this for file-1.
4054 */
4055 temp->name = "/dev/null";
4056 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4057 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4058 return temp;
4059 }
4060
4061 if (!S_ISGITLINK(one->mode) &&
4062 (!one->oid_valid ||
4063 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4064 struct stat st;
4065 if (lstat(name, &st) < 0) {
4066 if (errno == ENOENT)
4067 goto not_a_valid_file;
4068 die_errno("stat(%s)", name);
4069 }
4070 if (S_ISLNK(st.st_mode)) {
4071 struct strbuf sb = STRBUF_INIT;
4072 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4073 die_errno("readlink(%s)", name);
4074 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4075 (one->oid_valid ?
4076 &one->oid : &null_oid),
4077 (one->oid_valid ?
4078 one->mode : S_IFLNK));
4079 strbuf_release(&sb);
4080 }
4081 else {
4082 /* we can borrow from the file in the work tree */
4083 temp->name = name;
4084 if (!one->oid_valid)
4085 oid_to_hex_r(temp->hex, &null_oid);
4086 else
4087 oid_to_hex_r(temp->hex, &one->oid);
4088 /* Even though we may sometimes borrow the
4089 * contents from the work tree, we always want
4090 * one->mode. mode is trustworthy even when
4091 * !(one->oid_valid), as long as
4092 * DIFF_FILE_VALID(one).
4093 */
4094 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4095 }
4096 return temp;
4097 }
4098 else {
4099 if (diff_populate_filespec(r, one, 0))
4100 die("cannot read data blob for %s", one->path);
4101 prep_temp_blob(r->index, name, temp,
4102 one->data, one->size,
4103 &one->oid, one->mode);
4104 }
4105 return temp;
4106 }
4107
4108 static void add_external_diff_name(struct repository *r,
4109 struct argv_array *argv,
4110 const char *name,
4111 struct diff_filespec *df)
4112 {
4113 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4114 argv_array_push(argv, temp->name);
4115 argv_array_push(argv, temp->hex);
4116 argv_array_push(argv, temp->mode);
4117 }
4118
4119 /* An external diff command takes:
4120 *
4121 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4122 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4123 *
4124 */
4125 static void run_external_diff(const char *pgm,
4126 const char *name,
4127 const char *other,
4128 struct diff_filespec *one,
4129 struct diff_filespec *two,
4130 const char *xfrm_msg,
4131 int complete_rewrite,
4132 struct diff_options *o)
4133 {
4134 struct argv_array argv = ARGV_ARRAY_INIT;
4135 struct argv_array env = ARGV_ARRAY_INIT;
4136 struct diff_queue_struct *q = &diff_queued_diff;
4137
4138 argv_array_push(&argv, pgm);
4139 argv_array_push(&argv, name);
4140
4141 if (one && two) {
4142 add_external_diff_name(o->repo, &argv, name, one);
4143 if (!other)
4144 add_external_diff_name(o->repo, &argv, name, two);
4145 else {
4146 add_external_diff_name(o->repo, &argv, other, two);
4147 argv_array_push(&argv, other);
4148 argv_array_push(&argv, xfrm_msg);
4149 }
4150 }
4151
4152 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4153 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4154
4155 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4156 die(_("external diff died, stopping at %s"), name);
4157
4158 remove_tempfile();
4159 argv_array_clear(&argv);
4160 argv_array_clear(&env);
4161 }
4162
4163 static int similarity_index(struct diff_filepair *p)
4164 {
4165 return p->score * 100 / MAX_SCORE;
4166 }
4167
4168 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4169 {
4170 if (startup_info->have_repository)
4171 return find_unique_abbrev(oid, abbrev);
4172 else {
4173 char *hex = oid_to_hex(oid);
4174 if (abbrev < 0)
4175 abbrev = FALLBACK_DEFAULT_ABBREV;
4176 if (abbrev > the_hash_algo->hexsz)
4177 BUG("oid abbreviation out of range: %d", abbrev);
4178 if (abbrev)
4179 hex[abbrev] = '\0';
4180 return hex;
4181 }
4182 }
4183
4184 static void fill_metainfo(struct strbuf *msg,
4185 const char *name,
4186 const char *other,
4187 struct diff_filespec *one,
4188 struct diff_filespec *two,
4189 struct diff_options *o,
4190 struct diff_filepair *p,
4191 int *must_show_header,
4192 int use_color)
4193 {
4194 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4195 const char *reset = diff_get_color(use_color, DIFF_RESET);
4196 const char *line_prefix = diff_line_prefix(o);
4197
4198 *must_show_header = 1;
4199 strbuf_init(msg, PATH_MAX * 2 + 300);
4200 switch (p->status) {
4201 case DIFF_STATUS_COPIED:
4202 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4203 line_prefix, set, similarity_index(p));
4204 strbuf_addf(msg, "%s\n%s%scopy from ",
4205 reset, line_prefix, set);
4206 quote_c_style(name, msg, NULL, 0);
4207 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4208 quote_c_style(other, msg, NULL, 0);
4209 strbuf_addf(msg, "%s\n", reset);
4210 break;
4211 case DIFF_STATUS_RENAMED:
4212 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4213 line_prefix, set, similarity_index(p));
4214 strbuf_addf(msg, "%s\n%s%srename from ",
4215 reset, line_prefix, set);
4216 quote_c_style(name, msg, NULL, 0);
4217 strbuf_addf(msg, "%s\n%s%srename to ",
4218 reset, line_prefix, set);
4219 quote_c_style(other, msg, NULL, 0);
4220 strbuf_addf(msg, "%s\n", reset);
4221 break;
4222 case DIFF_STATUS_MODIFIED:
4223 if (p->score) {
4224 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4225 line_prefix,
4226 set, similarity_index(p), reset);
4227 break;
4228 }
4229 /* fallthru */
4230 default:
4231 *must_show_header = 0;
4232 }
4233 if (one && two && !oideq(&one->oid, &two->oid)) {
4234 const unsigned hexsz = the_hash_algo->hexsz;
4235 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4236
4237 if (o->flags.binary) {
4238 mmfile_t mf;
4239 if ((!fill_mmfile(o->repo, &mf, one) &&
4240 diff_filespec_is_binary(o->repo, one)) ||
4241 (!fill_mmfile(o->repo, &mf, two) &&
4242 diff_filespec_is_binary(o->repo, two)))
4243 abbrev = hexsz;
4244 }
4245 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4246 diff_abbrev_oid(&one->oid, abbrev),
4247 diff_abbrev_oid(&two->oid, abbrev));
4248 if (one->mode == two->mode)
4249 strbuf_addf(msg, " %06o", one->mode);
4250 strbuf_addf(msg, "%s\n", reset);
4251 }
4252 }
4253
4254 static void run_diff_cmd(const char *pgm,
4255 const char *name,
4256 const char *other,
4257 const char *attr_path,
4258 struct diff_filespec *one,
4259 struct diff_filespec *two,
4260 struct strbuf *msg,
4261 struct diff_options *o,
4262 struct diff_filepair *p)
4263 {
4264 const char *xfrm_msg = NULL;
4265 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4266 int must_show_header = 0;
4267
4268
4269 if (o->flags.allow_external) {
4270 struct userdiff_driver *drv;
4271
4272 drv = userdiff_find_by_path(o->repo->index, attr_path);
4273 if (drv && drv->external)
4274 pgm = drv->external;
4275 }
4276
4277 if (msg) {
4278 /*
4279 * don't use colors when the header is intended for an
4280 * external diff driver
4281 */
4282 fill_metainfo(msg, name, other, one, two, o, p,
4283 &must_show_header,
4284 want_color(o->use_color) && !pgm);
4285 xfrm_msg = msg->len ? msg->buf : NULL;
4286 }
4287
4288 if (pgm) {
4289 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4290 complete_rewrite, o);
4291 return;
4292 }
4293 if (one && two)
4294 builtin_diff(name, other ? other : name,
4295 one, two, xfrm_msg, must_show_header,
4296 o, complete_rewrite);
4297 else
4298 fprintf(o->file, "* Unmerged path %s\n", name);
4299 }
4300
4301 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4302 {
4303 if (DIFF_FILE_VALID(one)) {
4304 if (!one->oid_valid) {
4305 struct stat st;
4306 if (one->is_stdin) {
4307 oidclr(&one->oid);
4308 return;
4309 }
4310 if (lstat(one->path, &st) < 0)
4311 die_errno("stat '%s'", one->path);
4312 if (index_path(istate, &one->oid, one->path, &st, 0))
4313 die("cannot hash %s", one->path);
4314 }
4315 }
4316 else
4317 oidclr(&one->oid);
4318 }
4319
4320 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4321 {
4322 /* Strip the prefix but do not molest /dev/null and absolute paths */
4323 if (*namep && !is_absolute_path(*namep)) {
4324 *namep += prefix_length;
4325 if (**namep == '/')
4326 ++*namep;
4327 }
4328 if (*otherp && !is_absolute_path(*otherp)) {
4329 *otherp += prefix_length;
4330 if (**otherp == '/')
4331 ++*otherp;
4332 }
4333 }
4334
4335 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4336 {
4337 const char *pgm = external_diff();
4338 struct strbuf msg;
4339 struct diff_filespec *one = p->one;
4340 struct diff_filespec *two = p->two;
4341 const char *name;
4342 const char *other;
4343 const char *attr_path;
4344
4345 name = one->path;
4346 other = (strcmp(name, two->path) ? two->path : NULL);
4347 attr_path = name;
4348 if (o->prefix_length)
4349 strip_prefix(o->prefix_length, &name, &other);
4350
4351 if (!o->flags.allow_external)
4352 pgm = NULL;
4353
4354 if (DIFF_PAIR_UNMERGED(p)) {
4355 run_diff_cmd(pgm, name, NULL, attr_path,
4356 NULL, NULL, NULL, o, p);
4357 return;
4358 }
4359
4360 diff_fill_oid_info(one, o->repo->index);
4361 diff_fill_oid_info(two, o->repo->index);
4362
4363 if (!pgm &&
4364 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4365 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4366 /*
4367 * a filepair that changes between file and symlink
4368 * needs to be split into deletion and creation.
4369 */
4370 struct diff_filespec *null = alloc_filespec(two->path);
4371 run_diff_cmd(NULL, name, other, attr_path,
4372 one, null, &msg,
4373 o, p);
4374 free(null);
4375 strbuf_release(&msg);
4376
4377 null = alloc_filespec(one->path);
4378 run_diff_cmd(NULL, name, other, attr_path,
4379 null, two, &msg, o, p);
4380 free(null);
4381 }
4382 else
4383 run_diff_cmd(pgm, name, other, attr_path,
4384 one, two, &msg, o, p);
4385
4386 strbuf_release(&msg);
4387 }
4388
4389 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4390 struct diffstat_t *diffstat)
4391 {
4392 const char *name;
4393 const char *other;
4394
4395 if (DIFF_PAIR_UNMERGED(p)) {
4396 /* unmerged */
4397 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4398 diffstat, o, p);
4399 return;
4400 }
4401
4402 name = p->one->path;
4403 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4404
4405 if (o->prefix_length)
4406 strip_prefix(o->prefix_length, &name, &other);
4407
4408 diff_fill_oid_info(p->one, o->repo->index);
4409 diff_fill_oid_info(p->two, o->repo->index);
4410
4411 builtin_diffstat(name, other, p->one, p->two,
4412 diffstat, o, p);
4413 }
4414
4415 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4416 {
4417 const char *name;
4418 const char *other;
4419 const char *attr_path;
4420
4421 if (DIFF_PAIR_UNMERGED(p)) {
4422 /* unmerged */
4423 return;
4424 }
4425
4426 name = p->one->path;
4427 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4428 attr_path = other ? other : name;
4429
4430 if (o->prefix_length)
4431 strip_prefix(o->prefix_length, &name, &other);
4432
4433 diff_fill_oid_info(p->one, o->repo->index);
4434 diff_fill_oid_info(p->two, o->repo->index);
4435
4436 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4437 }
4438
4439 void repo_diff_setup(struct repository *r, struct diff_options *options)
4440 {
4441 memcpy(options, &default_diff_options, sizeof(*options));
4442
4443 options->file = stdout;
4444 options->repo = r;
4445
4446 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4447 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4448 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4449 options->abbrev = DEFAULT_ABBREV;
4450 options->line_termination = '\n';
4451 options->break_opt = -1;
4452 options->rename_limit = -1;
4453 options->dirstat_permille = diff_dirstat_permille_default;
4454 options->context = diff_context_default;
4455 options->interhunkcontext = diff_interhunk_context_default;
4456 options->ws_error_highlight = ws_error_highlight_default;
4457 options->flags.rename_empty = 1;
4458 options->objfind = NULL;
4459
4460 /* pathchange left =NULL by default */
4461 options->change = diff_change;
4462 options->add_remove = diff_addremove;
4463 options->use_color = diff_use_color_default;
4464 options->detect_rename = diff_detect_rename_default;
4465 options->xdl_opts |= diff_algorithm;
4466 if (diff_indent_heuristic)
4467 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4468
4469 options->orderfile = diff_order_file_cfg;
4470
4471 if (diff_no_prefix) {
4472 options->a_prefix = options->b_prefix = "";
4473 } else if (!diff_mnemonic_prefix) {
4474 options->a_prefix = "a/";
4475 options->b_prefix = "b/";
4476 }
4477
4478 options->color_moved = diff_color_moved_default;
4479 options->color_moved_ws_handling = diff_color_moved_ws_default;
4480 }
4481
4482 void diff_setup_done(struct diff_options *options)
4483 {
4484 unsigned check_mask = DIFF_FORMAT_NAME |
4485 DIFF_FORMAT_NAME_STATUS |
4486 DIFF_FORMAT_CHECKDIFF |
4487 DIFF_FORMAT_NO_OUTPUT;
4488 /*
4489 * This must be signed because we're comparing against a potentially
4490 * negative value.
4491 */
4492 const int hexsz = the_hash_algo->hexsz;
4493
4494 if (options->set_default)
4495 options->set_default(options);
4496
4497 if (HAS_MULTI_BITS(options->output_format & check_mask))
4498 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4499
4500 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4501 die(_("-G, -S and --find-object are mutually exclusive"));
4502
4503 /*
4504 * Most of the time we can say "there are changes"
4505 * only by checking if there are changed paths, but
4506 * --ignore-whitespace* options force us to look
4507 * inside contents.
4508 */
4509
4510 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4511 options->flags.diff_from_contents = 1;
4512 else
4513 options->flags.diff_from_contents = 0;
4514
4515 if (options->flags.find_copies_harder)
4516 options->detect_rename = DIFF_DETECT_COPY;
4517
4518 if (!options->flags.relative_name)
4519 options->prefix = NULL;
4520 if (options->prefix)
4521 options->prefix_length = strlen(options->prefix);
4522 else
4523 options->prefix_length = 0;
4524
4525 if (options->output_format & (DIFF_FORMAT_NAME |
4526 DIFF_FORMAT_NAME_STATUS |
4527 DIFF_FORMAT_CHECKDIFF |
4528 DIFF_FORMAT_NO_OUTPUT))
4529 options->output_format &= ~(DIFF_FORMAT_RAW |
4530 DIFF_FORMAT_NUMSTAT |
4531 DIFF_FORMAT_DIFFSTAT |
4532 DIFF_FORMAT_SHORTSTAT |
4533 DIFF_FORMAT_DIRSTAT |
4534 DIFF_FORMAT_SUMMARY |
4535 DIFF_FORMAT_PATCH);
4536
4537 /*
4538 * These cases always need recursive; we do not drop caller-supplied
4539 * recursive bits for other formats here.
4540 */
4541 if (options->output_format & (DIFF_FORMAT_PATCH |
4542 DIFF_FORMAT_NUMSTAT |
4543 DIFF_FORMAT_DIFFSTAT |
4544 DIFF_FORMAT_SHORTSTAT |
4545 DIFF_FORMAT_DIRSTAT |
4546 DIFF_FORMAT_SUMMARY |
4547 DIFF_FORMAT_CHECKDIFF))
4548 options->flags.recursive = 1;
4549 /*
4550 * Also pickaxe would not work very well if you do not say recursive
4551 */
4552 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4553 options->flags.recursive = 1;
4554 /*
4555 * When patches are generated, submodules diffed against the work tree
4556 * must be checked for dirtiness too so it can be shown in the output
4557 */
4558 if (options->output_format & DIFF_FORMAT_PATCH)
4559 options->flags.dirty_submodules = 1;
4560
4561 if (options->detect_rename && options->rename_limit < 0)
4562 options->rename_limit = diff_rename_limit_default;
4563 if (hexsz < options->abbrev)
4564 options->abbrev = hexsz; /* full */
4565
4566 /*
4567 * It does not make sense to show the first hit we happened
4568 * to have found. It does not make sense not to return with
4569 * exit code in such a case either.
4570 */
4571 if (options->flags.quick) {
4572 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4573 options->flags.exit_with_status = 1;
4574 }
4575
4576 options->diff_path_counter = 0;
4577
4578 if (options->flags.follow_renames && options->pathspec.nr != 1)
4579 die(_("--follow requires exactly one pathspec"));
4580
4581 if (!options->use_color || external_diff())
4582 options->color_moved = 0;
4583 }
4584
4585 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4586 {
4587 char c, *eq;
4588 int len;
4589
4590 if (*arg != '-')
4591 return 0;
4592 c = *++arg;
4593 if (!c)
4594 return 0;
4595 if (c == arg_short) {
4596 c = *++arg;
4597 if (!c)
4598 return 1;
4599 if (val && isdigit(c)) {
4600 char *end;
4601 int n = strtoul(arg, &end, 10);
4602 if (*end)
4603 return 0;
4604 *val = n;
4605 return 1;
4606 }
4607 return 0;
4608 }
4609 if (c != '-')
4610 return 0;
4611 arg++;
4612 eq = strchrnul(arg, '=');
4613 len = eq - arg;
4614 if (!len || strncmp(arg, arg_long, len))
4615 return 0;
4616 if (*eq) {
4617 int n;
4618 char *end;
4619 if (!isdigit(*++eq))
4620 return 0;
4621 n = strtoul(eq, &end, 10);
4622 if (*end)
4623 return 0;
4624 *val = n;
4625 }
4626 return 1;
4627 }
4628
4629 static int diff_scoreopt_parse(const char *opt);
4630
4631 static inline int short_opt(char opt, const char **argv,
4632 const char **optarg)
4633 {
4634 const char *arg = argv[0];
4635 if (arg[0] != '-' || arg[1] != opt)
4636 return 0;
4637 if (arg[2] != '\0') {
4638 *optarg = arg + 2;
4639 return 1;
4640 }
4641 if (!argv[1])
4642 die("Option '%c' requires a value", opt);
4643 *optarg = argv[1];
4644 return 2;
4645 }
4646
4647 int parse_long_opt(const char *opt, const char **argv,
4648 const char **optarg)
4649 {
4650 const char *arg = argv[0];
4651 if (!skip_prefix(arg, "--", &arg))
4652 return 0;
4653 if (!skip_prefix(arg, opt, &arg))
4654 return 0;
4655 if (*arg == '=') { /* stuck form: --option=value */
4656 *optarg = arg + 1;
4657 return 1;
4658 }
4659 if (*arg != '\0')
4660 return 0;
4661 /* separate form: --option value */
4662 if (!argv[1])
4663 die("Option '--%s' requires a value", opt);
4664 *optarg = argv[1];
4665 return 2;
4666 }
4667
4668 static int stat_opt(struct diff_options *options, const char **av)
4669 {
4670 const char *arg = av[0];
4671 char *end;
4672 int width = options->stat_width;
4673 int name_width = options->stat_name_width;
4674 int graph_width = options->stat_graph_width;
4675 int count = options->stat_count;
4676 int argcount = 1;
4677
4678 if (!skip_prefix(arg, "--stat", &arg))
4679 BUG("stat option does not begin with --stat: %s", arg);
4680 end = (char *)arg;
4681
4682 switch (*arg) {
4683 case '-':
4684 if (skip_prefix(arg, "-width", &arg)) {
4685 if (*arg == '=')
4686 width = strtoul(arg + 1, &end, 10);
4687 else if (!*arg && !av[1])
4688 die_want_option("--stat-width");
4689 else if (!*arg) {
4690 width = strtoul(av[1], &end, 10);
4691 argcount = 2;
4692 }
4693 } else if (skip_prefix(arg, "-name-width", &arg)) {
4694 if (*arg == '=')
4695 name_width = strtoul(arg + 1, &end, 10);
4696 else if (!*arg && !av[1])
4697 die_want_option("--stat-name-width");
4698 else if (!*arg) {
4699 name_width = strtoul(av[1], &end, 10);
4700 argcount = 2;
4701 }
4702 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4703 if (*arg == '=')
4704 graph_width = strtoul(arg + 1, &end, 10);
4705 else if (!*arg && !av[1])
4706 die_want_option("--stat-graph-width");
4707 else if (!*arg) {
4708 graph_width = strtoul(av[1], &end, 10);
4709 argcount = 2;
4710 }
4711 } else if (skip_prefix(arg, "-count", &arg)) {
4712 if (*arg == '=')
4713 count = strtoul(arg + 1, &end, 10);
4714 else if (!*arg && !av[1])
4715 die_want_option("--stat-count");
4716 else if (!*arg) {
4717 count = strtoul(av[1], &end, 10);
4718 argcount = 2;
4719 }
4720 }
4721 break;
4722 case '=':
4723 width = strtoul(arg+1, &end, 10);
4724 if (*end == ',')
4725 name_width = strtoul(end+1, &end, 10);
4726 if (*end == ',')
4727 count = strtoul(end+1, &end, 10);
4728 }
4729
4730 /* Important! This checks all the error cases! */
4731 if (*end)
4732 return 0;
4733 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4734 options->stat_name_width = name_width;
4735 options->stat_graph_width = graph_width;
4736 options->stat_width = width;
4737 options->stat_count = count;
4738 return argcount;
4739 }
4740
4741 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4742 {
4743 struct strbuf errmsg = STRBUF_INIT;
4744 if (parse_dirstat_params(options, params, &errmsg))
4745 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4746 errmsg.buf);
4747 strbuf_release(&errmsg);
4748 /*
4749 * The caller knows a dirstat-related option is given from the command
4750 * line; allow it to say "return this_function();"
4751 */
4752 options->output_format |= DIFF_FORMAT_DIRSTAT;
4753 return 1;
4754 }
4755
4756 static int parse_submodule_opt(struct diff_options *options, const char *value)
4757 {
4758 if (parse_submodule_params(options, value))
4759 die(_("Failed to parse --submodule option parameter: '%s'"),
4760 value);
4761 return 1;
4762 }
4763
4764 static const char diff_status_letters[] = {
4765 DIFF_STATUS_ADDED,
4766 DIFF_STATUS_COPIED,
4767 DIFF_STATUS_DELETED,
4768 DIFF_STATUS_MODIFIED,
4769 DIFF_STATUS_RENAMED,
4770 DIFF_STATUS_TYPE_CHANGED,
4771 DIFF_STATUS_UNKNOWN,
4772 DIFF_STATUS_UNMERGED,
4773 DIFF_STATUS_FILTER_AON,
4774 DIFF_STATUS_FILTER_BROKEN,
4775 '\0',
4776 };
4777
4778 static unsigned int filter_bit['Z' + 1];
4779
4780 static void prepare_filter_bits(void)
4781 {
4782 int i;
4783
4784 if (!filter_bit[DIFF_STATUS_ADDED]) {
4785 for (i = 0; diff_status_letters[i]; i++)
4786 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4787 }
4788 }
4789
4790 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4791 {
4792 return opt->filter & filter_bit[(int) status];
4793 }
4794
4795 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4796 {
4797 int i, optch;
4798
4799 prepare_filter_bits();
4800
4801 /*
4802 * If there is a negation e.g. 'd' in the input, and we haven't
4803 * initialized the filter field with another --diff-filter, start
4804 * from full set of bits, except for AON.
4805 */
4806 if (!opt->filter) {
4807 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4808 if (optch < 'a' || 'z' < optch)
4809 continue;
4810 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4811 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4812 break;
4813 }
4814 }
4815
4816 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4817 unsigned int bit;
4818 int negate;
4819
4820 if ('a' <= optch && optch <= 'z') {
4821 negate = 1;
4822 optch = toupper(optch);
4823 } else {
4824 negate = 0;
4825 }
4826
4827 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4828 if (!bit)
4829 return optarg[i];
4830 if (negate)
4831 opt->filter &= ~bit;
4832 else
4833 opt->filter |= bit;
4834 }
4835 return 0;
4836 }
4837
4838 static void enable_patch_output(int *fmt) {
4839 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4840 *fmt |= DIFF_FORMAT_PATCH;
4841 }
4842
4843 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4844 {
4845 int val = parse_ws_error_highlight(arg);
4846
4847 if (val < 0) {
4848 error("unknown value after ws-error-highlight=%.*s",
4849 -1 - val, arg);
4850 return 0;
4851 }
4852 opt->ws_error_highlight = val;
4853 return 1;
4854 }
4855
4856 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4857 {
4858 struct object_id oid;
4859
4860 if (get_oid(arg, &oid))
4861 return error("unable to resolve '%s'", arg);
4862
4863 if (!opt->objfind)
4864 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4865
4866 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4867 opt->flags.recursive = 1;
4868 opt->flags.tree_in_recursive = 1;
4869 oidset_insert(opt->objfind, &oid);
4870 return 1;
4871 }
4872
4873 int diff_opt_parse(struct diff_options *options,
4874 const char **av, int ac, const char *prefix)
4875 {
4876 const char *arg = av[0];
4877 const char *optarg;
4878 int argcount;
4879
4880 if (!prefix)
4881 prefix = "";
4882
4883 /* Output format options */
4884 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4885 || opt_arg(arg, 'U', "unified", &options->context))
4886 enable_patch_output(&options->output_format);
4887 else if (!strcmp(arg, "--raw"))
4888 options->output_format |= DIFF_FORMAT_RAW;
4889 else if (!strcmp(arg, "--patch-with-raw")) {
4890 enable_patch_output(&options->output_format);
4891 options->output_format |= DIFF_FORMAT_RAW;
4892 } else if (!strcmp(arg, "--numstat"))
4893 options->output_format |= DIFF_FORMAT_NUMSTAT;
4894 else if (!strcmp(arg, "--shortstat"))
4895 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4896 else if (skip_prefix(arg, "-X", &arg) ||
4897 skip_to_optional_arg(arg, "--dirstat", &arg))
4898 return parse_dirstat_opt(options, arg);
4899 else if (!strcmp(arg, "--cumulative"))
4900 return parse_dirstat_opt(options, "cumulative");
4901 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4902 parse_dirstat_opt(options, "files");
4903 return parse_dirstat_opt(options, arg);
4904 }
4905 else if (!strcmp(arg, "--check"))
4906 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4907 else if (!strcmp(arg, "--summary"))
4908 options->output_format |= DIFF_FORMAT_SUMMARY;
4909 else if (!strcmp(arg, "--patch-with-stat")) {
4910 enable_patch_output(&options->output_format);
4911 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4912 } else if (!strcmp(arg, "--name-only"))
4913 options->output_format |= DIFF_FORMAT_NAME;
4914 else if (!strcmp(arg, "--name-status"))
4915 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4916 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4917 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4918 else if (starts_with(arg, "--stat"))
4919 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4920 return stat_opt(options, av);
4921 else if (!strcmp(arg, "--compact-summary")) {
4922 options->flags.stat_with_summary = 1;
4923 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4924 } else if (!strcmp(arg, "--no-compact-summary"))
4925 options->flags.stat_with_summary = 0;
4926 else if (skip_prefix(arg, "--output-indicator-new=", &arg))
4927 options->output_indicators[OUTPUT_INDICATOR_NEW] = arg[0];
4928 else if (skip_prefix(arg, "--output-indicator-old=", &arg))
4929 options->output_indicators[OUTPUT_INDICATOR_OLD] = arg[0];
4930 else if (skip_prefix(arg, "--output-indicator-context=", &arg))
4931 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = arg[0];
4932
4933 /* renames options */
4934 else if (starts_with(arg, "-B") ||
4935 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4936 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4937 return error("invalid argument to -B: %s", arg+2);
4938 }
4939 else if (starts_with(arg, "-M") ||
4940 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4941 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4942 return error("invalid argument to -M: %s", arg+2);
4943 options->detect_rename = DIFF_DETECT_RENAME;
4944 }
4945 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4946 options->irreversible_delete = 1;
4947 }
4948 else if (starts_with(arg, "-C") ||
4949 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4950 if (options->detect_rename == DIFF_DETECT_COPY)
4951 options->flags.find_copies_harder = 1;
4952 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4953 return error("invalid argument to -C: %s", arg+2);
4954 options->detect_rename = DIFF_DETECT_COPY;
4955 }
4956 else if (!strcmp(arg, "--no-renames"))
4957 options->detect_rename = 0;
4958 else if (!strcmp(arg, "--rename-empty"))
4959 options->flags.rename_empty = 1;
4960 else if (!strcmp(arg, "--no-rename-empty"))
4961 options->flags.rename_empty = 0;
4962 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4963 options->flags.relative_name = 1;
4964 if (arg)
4965 options->prefix = arg;
4966 }
4967
4968 /* xdiff options */
4969 else if (!strcmp(arg, "--minimal"))
4970 DIFF_XDL_SET(options, NEED_MINIMAL);
4971 else if (!strcmp(arg, "--no-minimal"))
4972 DIFF_XDL_CLR(options, NEED_MINIMAL);
4973 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4974 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4975 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4976 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4977 else if (!strcmp(arg, "--ignore-space-at-eol"))
4978 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4979 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4980 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4981 else if (!strcmp(arg, "--ignore-blank-lines"))
4982 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4983 else if (!strcmp(arg, "--indent-heuristic"))
4984 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4985 else if (!strcmp(arg, "--no-indent-heuristic"))
4986 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4987 else if (!strcmp(arg, "--patience")) {
4988 int i;
4989 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4990 /*
4991 * Both --patience and --anchored use PATIENCE_DIFF
4992 * internally, so remove any anchors previously
4993 * specified.
4994 */
4995 for (i = 0; i < options->anchors_nr; i++)
4996 free(options->anchors[i]);
4997 options->anchors_nr = 0;
4998 } else if (!strcmp(arg, "--histogram"))
4999 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
5000 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
5001 long value = parse_algorithm_value(optarg);
5002 if (value < 0)
5003 return error("option diff-algorithm accepts \"myers\", "
5004 "\"minimal\", \"patience\" and \"histogram\"");
5005 /* clear out previous settings */
5006 DIFF_XDL_CLR(options, NEED_MINIMAL);
5007 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5008 options->xdl_opts |= value;
5009 return argcount;
5010 } else if (skip_prefix(arg, "--anchored=", &arg)) {
5011 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5012 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
5013 options->anchors_alloc);
5014 options->anchors[options->anchors_nr++] = xstrdup(arg);
5015 }
5016
5017 /* flags options */
5018 else if (!strcmp(arg, "--binary")) {
5019 enable_patch_output(&options->output_format);
5020 options->flags.binary = 1;
5021 }
5022 else if (!strcmp(arg, "--full-index"))
5023 options->flags.full_index = 1;
5024 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
5025 options->flags.text = 1;
5026 else if (!strcmp(arg, "-R"))
5027 options->flags.reverse_diff = 1;
5028 else if (!strcmp(arg, "--find-copies-harder"))
5029 options->flags.find_copies_harder = 1;
5030 else if (!strcmp(arg, "--follow"))
5031 options->flags.follow_renames = 1;
5032 else if (!strcmp(arg, "--no-follow")) {
5033 options->flags.follow_renames = 0;
5034 options->flags.default_follow_renames = 0;
5035 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
5036 int value = git_config_colorbool(NULL, arg);
5037 if (value < 0)
5038 return error("option `color' expects \"always\", \"auto\", or \"never\"");
5039 options->use_color = value;
5040 }
5041 else if (!strcmp(arg, "--no-color"))
5042 options->use_color = 0;
5043 else if (!strcmp(arg, "--color-moved")) {
5044 if (diff_color_moved_default)
5045 options->color_moved = diff_color_moved_default;
5046 if (options->color_moved == COLOR_MOVED_NO)
5047 options->color_moved = COLOR_MOVED_DEFAULT;
5048 } else if (!strcmp(arg, "--no-color-moved"))
5049 options->color_moved = COLOR_MOVED_NO;
5050 else if (skip_prefix(arg, "--color-moved=", &arg)) {
5051 int cm = parse_color_moved(arg);
5052 if (cm < 0)
5053 die("bad --color-moved argument: %s", arg);
5054 options->color_moved = cm;
5055 } else if (!strcmp(arg, "--no-color-moved-ws")) {
5056 options->color_moved_ws_handling = 0;
5057 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
5058 options->color_moved_ws_handling = parse_color_moved_ws(arg);
5059 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
5060 options->use_color = 1;
5061 options->word_diff = DIFF_WORDS_COLOR;
5062 }
5063 else if (!strcmp(arg, "--word-diff")) {
5064 if (options->word_diff == DIFF_WORDS_NONE)
5065 options->word_diff = DIFF_WORDS_PLAIN;
5066 }
5067 else if (skip_prefix(arg, "--word-diff=", &arg)) {
5068 if (!strcmp(arg, "plain"))
5069 options->word_diff = DIFF_WORDS_PLAIN;
5070 else if (!strcmp(arg, "color")) {
5071 options->use_color = 1;
5072 options->word_diff = DIFF_WORDS_COLOR;
5073 }
5074 else if (!strcmp(arg, "porcelain"))
5075 options->word_diff = DIFF_WORDS_PORCELAIN;
5076 else if (!strcmp(arg, "none"))
5077 options->word_diff = DIFF_WORDS_NONE;
5078 else
5079 die("bad --word-diff argument: %s", arg);
5080 }
5081 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5082 if (options->word_diff == DIFF_WORDS_NONE)
5083 options->word_diff = DIFF_WORDS_PLAIN;
5084 options->word_regex = optarg;
5085 return argcount;
5086 }
5087 else if (!strcmp(arg, "--exit-code"))
5088 options->flags.exit_with_status = 1;
5089 else if (!strcmp(arg, "--quiet"))
5090 options->flags.quick = 1;
5091 else if (!strcmp(arg, "--ext-diff"))
5092 options->flags.allow_external = 1;
5093 else if (!strcmp(arg, "--no-ext-diff"))
5094 options->flags.allow_external = 0;
5095 else if (!strcmp(arg, "--textconv")) {
5096 options->flags.allow_textconv = 1;
5097 options->flags.textconv_set_via_cmdline = 1;
5098 } else if (!strcmp(arg, "--no-textconv"))
5099 options->flags.allow_textconv = 0;
5100 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5101 options->flags.override_submodule_config = 1;
5102 handle_ignore_submodules_arg(options, arg);
5103 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5104 return parse_submodule_opt(options, arg);
5105 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5106 return parse_ws_error_highlight_opt(options, arg);
5107 else if (!strcmp(arg, "--ita-invisible-in-index"))
5108 options->ita_invisible_in_index = 1;
5109 else if (!strcmp(arg, "--ita-visible-in-index"))
5110 options->ita_invisible_in_index = 0;
5111
5112 /* misc options */
5113 else if (!strcmp(arg, "-z"))
5114 options->line_termination = 0;
5115 else if ((argcount = short_opt('l', av, &optarg))) {
5116 options->rename_limit = strtoul(optarg, NULL, 10);
5117 return argcount;
5118 }
5119 else if ((argcount = short_opt('S', av, &optarg))) {
5120 options->pickaxe = optarg;
5121 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5122 return argcount;
5123 } else if ((argcount = short_opt('G', av, &optarg))) {
5124 options->pickaxe = optarg;
5125 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5126 return argcount;
5127 }
5128 else if (!strcmp(arg, "--pickaxe-all"))
5129 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5130 else if (!strcmp(arg, "--pickaxe-regex"))
5131 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5132 else if ((argcount = short_opt('O', av, &optarg))) {
5133 options->orderfile = prefix_filename(prefix, optarg);
5134 return argcount;
5135 } else if (skip_prefix(arg, "--find-object=", &arg))
5136 return parse_objfind_opt(options, arg);
5137 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5138 int offending = parse_diff_filter_opt(optarg, options);
5139 if (offending)
5140 die("unknown change class '%c' in --diff-filter=%s",
5141 offending, optarg);
5142 return argcount;
5143 }
5144 else if (!strcmp(arg, "--no-abbrev"))
5145 options->abbrev = 0;
5146 else if (!strcmp(arg, "--abbrev"))
5147 options->abbrev = DEFAULT_ABBREV;
5148 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5149 options->abbrev = strtoul(arg, NULL, 10);
5150 if (options->abbrev < MINIMUM_ABBREV)
5151 options->abbrev = MINIMUM_ABBREV;
5152 else if (the_hash_algo->hexsz < options->abbrev)
5153 options->abbrev = the_hash_algo->hexsz;
5154 }
5155 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5156 options->a_prefix = optarg;
5157 return argcount;
5158 }
5159 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5160 options->line_prefix = optarg;
5161 options->line_prefix_length = strlen(options->line_prefix);
5162 graph_setup_line_prefix(options);
5163 return argcount;
5164 }
5165 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5166 options->b_prefix = optarg;
5167 return argcount;
5168 }
5169 else if (!strcmp(arg, "--no-prefix"))
5170 options->a_prefix = options->b_prefix = "";
5171 else if (opt_arg(arg, '\0', "inter-hunk-context",
5172 &options->interhunkcontext))
5173 ;
5174 else if (!strcmp(arg, "-W"))
5175 options->flags.funccontext = 1;
5176 else if (!strcmp(arg, "--function-context"))
5177 options->flags.funccontext = 1;
5178 else if (!strcmp(arg, "--no-function-context"))
5179 options->flags.funccontext = 0;
5180 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5181 char *path = prefix_filename(prefix, optarg);
5182 options->file = xfopen(path, "w");
5183 options->close_file = 1;
5184 if (options->use_color != GIT_COLOR_ALWAYS)
5185 options->use_color = GIT_COLOR_NEVER;
5186 free(path);
5187 return argcount;
5188 } else
5189 return 0;
5190 return 1;
5191 }
5192
5193 int parse_rename_score(const char **cp_p)
5194 {
5195 unsigned long num, scale;
5196 int ch, dot;
5197 const char *cp = *cp_p;
5198
5199 num = 0;
5200 scale = 1;
5201 dot = 0;
5202 for (;;) {
5203 ch = *cp;
5204 if ( !dot && ch == '.' ) {
5205 scale = 1;
5206 dot = 1;
5207 } else if ( ch == '%' ) {
5208 scale = dot ? scale*100 : 100;
5209 cp++; /* % is always at the end */
5210 break;
5211 } else if ( ch >= '0' && ch <= '9' ) {
5212 if ( scale < 100000 ) {
5213 scale *= 10;
5214 num = (num*10) + (ch-'0');
5215 }
5216 } else {
5217 break;
5218 }
5219 cp++;
5220 }
5221 *cp_p = cp;
5222
5223 /* user says num divided by scale and we say internally that
5224 * is MAX_SCORE * num / scale.
5225 */
5226 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5227 }
5228
5229 static int diff_scoreopt_parse(const char *opt)
5230 {
5231 int opt1, opt2, cmd;
5232
5233 if (*opt++ != '-')
5234 return -1;
5235 cmd = *opt++;
5236 if (cmd == '-') {
5237 /* convert the long-form arguments into short-form versions */
5238 if (skip_prefix(opt, "break-rewrites", &opt)) {
5239 if (*opt == 0 || *opt++ == '=')
5240 cmd = 'B';
5241 } else if (skip_prefix(opt, "find-copies", &opt)) {
5242 if (*opt == 0 || *opt++ == '=')
5243 cmd = 'C';
5244 } else if (skip_prefix(opt, "find-renames", &opt)) {
5245 if (*opt == 0 || *opt++ == '=')
5246 cmd = 'M';
5247 }
5248 }
5249 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5250 return -1; /* that is not a -M, -C, or -B option */
5251
5252 opt1 = parse_rename_score(&opt);
5253 if (cmd != 'B')
5254 opt2 = 0;
5255 else {
5256 if (*opt == 0)
5257 opt2 = 0;
5258 else if (*opt != '/')
5259 return -1; /* we expect -B80/99 or -B80 */
5260 else {
5261 opt++;
5262 opt2 = parse_rename_score(&opt);
5263 }
5264 }
5265 if (*opt != 0)
5266 return -1;
5267 return opt1 | (opt2 << 16);
5268 }
5269
5270 struct diff_queue_struct diff_queued_diff;
5271
5272 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5273 {
5274 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5275 queue->queue[queue->nr++] = dp;
5276 }
5277
5278 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5279 struct diff_filespec *one,
5280 struct diff_filespec *two)
5281 {
5282 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5283 dp->one = one;
5284 dp->two = two;
5285 if (queue)
5286 diff_q(queue, dp);
5287 return dp;
5288 }
5289
5290 void diff_free_filepair(struct diff_filepair *p)
5291 {
5292 free_filespec(p->one);
5293 free_filespec(p->two);
5294 free(p);
5295 }
5296
5297 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5298 {
5299 int abblen;
5300 const char *abbrev;
5301
5302 /* Do we want all 40 hex characters? */
5303 if (len == the_hash_algo->hexsz)
5304 return oid_to_hex(oid);
5305
5306 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5307 abbrev = diff_abbrev_oid(oid, len);
5308
5309 if (!print_sha1_ellipsis())
5310 return abbrev;
5311
5312 abblen = strlen(abbrev);
5313
5314 /*
5315 * In well-behaved cases, where the abbreviated result is the
5316 * same as the requested length, append three dots after the
5317 * abbreviation (hence the whole logic is limited to the case
5318 * where abblen < 37); when the actual abbreviated result is a
5319 * bit longer than the requested length, we reduce the number
5320 * of dots so that they match the well-behaved ones. However,
5321 * if the actual abbreviation is longer than the requested
5322 * length by more than three, we give up on aligning, and add
5323 * three dots anyway, to indicate that the output is not the
5324 * full object name. Yes, this may be suboptimal, but this
5325 * appears only in "diff --raw --abbrev" output and it is not
5326 * worth the effort to change it now. Note that this would
5327 * likely to work fine when the automatic sizing of default
5328 * abbreviation length is used--we would be fed -1 in "len" in
5329 * that case, and will end up always appending three-dots, but
5330 * the automatic sizing is supposed to give abblen that ensures
5331 * uniqueness across all objects (statistically speaking).
5332 */
5333 if (abblen < the_hash_algo->hexsz - 3) {
5334 static char hex[GIT_MAX_HEXSZ + 1];
5335 if (len < abblen && abblen <= len + 2)
5336 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5337 else
5338 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5339 return hex;
5340 }
5341
5342 return oid_to_hex(oid);
5343 }
5344
5345 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5346 {
5347 int line_termination = opt->line_termination;
5348 int inter_name_termination = line_termination ? '\t' : '\0';
5349
5350 fprintf(opt->file, "%s", diff_line_prefix(opt));
5351 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5352 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5353 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5354 fprintf(opt->file, "%s ",
5355 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5356 }
5357 if (p->score) {
5358 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5359 inter_name_termination);
5360 } else {
5361 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5362 }
5363
5364 if (p->status == DIFF_STATUS_COPIED ||
5365 p->status == DIFF_STATUS_RENAMED) {
5366 const char *name_a, *name_b;
5367 name_a = p->one->path;
5368 name_b = p->two->path;
5369 strip_prefix(opt->prefix_length, &name_a, &name_b);
5370 write_name_quoted(name_a, opt->file, inter_name_termination);
5371 write_name_quoted(name_b, opt->file, line_termination);
5372 } else {
5373 const char *name_a, *name_b;
5374 name_a = p->one->mode ? p->one->path : p->two->path;
5375 name_b = NULL;
5376 strip_prefix(opt->prefix_length, &name_a, &name_b);
5377 write_name_quoted(name_a, opt->file, line_termination);
5378 }
5379 }
5380
5381 int diff_unmodified_pair(struct diff_filepair *p)
5382 {
5383 /* This function is written stricter than necessary to support
5384 * the currently implemented transformers, but the idea is to
5385 * let transformers to produce diff_filepairs any way they want,
5386 * and filter and clean them up here before producing the output.
5387 */
5388 struct diff_filespec *one = p->one, *two = p->two;
5389
5390 if (DIFF_PAIR_UNMERGED(p))
5391 return 0; /* unmerged is interesting */
5392
5393 /* deletion, addition, mode or type change
5394 * and rename are all interesting.
5395 */
5396 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5397 DIFF_PAIR_MODE_CHANGED(p) ||
5398 strcmp(one->path, two->path))
5399 return 0;
5400
5401 /* both are valid and point at the same path. that is, we are
5402 * dealing with a change.
5403 */
5404 if (one->oid_valid && two->oid_valid &&
5405 oideq(&one->oid, &two->oid) &&
5406 !one->dirty_submodule && !two->dirty_submodule)
5407 return 1; /* no change */
5408 if (!one->oid_valid && !two->oid_valid)
5409 return 1; /* both look at the same file on the filesystem. */
5410 return 0;
5411 }
5412
5413 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5414 {
5415 if (diff_unmodified_pair(p))
5416 return;
5417
5418 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5419 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5420 return; /* no tree diffs in patch format */
5421
5422 run_diff(p, o);
5423 }
5424
5425 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5426 struct diffstat_t *diffstat)
5427 {
5428 if (diff_unmodified_pair(p))
5429 return;
5430
5431 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5432 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5433 return; /* no useful stat for tree diffs */
5434
5435 run_diffstat(p, o, diffstat);
5436 }
5437
5438 static void diff_flush_checkdiff(struct diff_filepair *p,
5439 struct diff_options *o)
5440 {
5441 if (diff_unmodified_pair(p))
5442 return;
5443
5444 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5445 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5446 return; /* nothing to check in tree diffs */
5447
5448 run_checkdiff(p, o);
5449 }
5450
5451 int diff_queue_is_empty(void)
5452 {
5453 struct diff_queue_struct *q = &diff_queued_diff;
5454 int i;
5455 for (i = 0; i < q->nr; i++)
5456 if (!diff_unmodified_pair(q->queue[i]))
5457 return 0;
5458 return 1;
5459 }
5460
5461 #if DIFF_DEBUG
5462 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5463 {
5464 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5465 x, one ? one : "",
5466 s->path,
5467 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5468 s->mode,
5469 s->oid_valid ? oid_to_hex(&s->oid) : "");
5470 fprintf(stderr, "queue[%d] %s size %lu\n",
5471 x, one ? one : "",
5472 s->size);
5473 }
5474
5475 void diff_debug_filepair(const struct diff_filepair *p, int i)
5476 {
5477 diff_debug_filespec(p->one, i, "one");
5478 diff_debug_filespec(p->two, i, "two");
5479 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5480 p->score, p->status ? p->status : '?',
5481 p->one->rename_used, p->broken_pair);
5482 }
5483
5484 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5485 {
5486 int i;
5487 if (msg)
5488 fprintf(stderr, "%s\n", msg);
5489 fprintf(stderr, "q->nr = %d\n", q->nr);
5490 for (i = 0; i < q->nr; i++) {
5491 struct diff_filepair *p = q->queue[i];
5492 diff_debug_filepair(p, i);
5493 }
5494 }
5495 #endif
5496
5497 static void diff_resolve_rename_copy(void)
5498 {
5499 int i;
5500 struct diff_filepair *p;
5501 struct diff_queue_struct *q = &diff_queued_diff;
5502
5503 diff_debug_queue("resolve-rename-copy", q);
5504
5505 for (i = 0; i < q->nr; i++) {
5506 p = q->queue[i];
5507 p->status = 0; /* undecided */
5508 if (DIFF_PAIR_UNMERGED(p))
5509 p->status = DIFF_STATUS_UNMERGED;
5510 else if (!DIFF_FILE_VALID(p->one))
5511 p->status = DIFF_STATUS_ADDED;
5512 else if (!DIFF_FILE_VALID(p->two))
5513 p->status = DIFF_STATUS_DELETED;
5514 else if (DIFF_PAIR_TYPE_CHANGED(p))
5515 p->status = DIFF_STATUS_TYPE_CHANGED;
5516
5517 /* from this point on, we are dealing with a pair
5518 * whose both sides are valid and of the same type, i.e.
5519 * either in-place edit or rename/copy edit.
5520 */
5521 else if (DIFF_PAIR_RENAME(p)) {
5522 /*
5523 * A rename might have re-connected a broken
5524 * pair up, causing the pathnames to be the
5525 * same again. If so, that's not a rename at
5526 * all, just a modification..
5527 *
5528 * Otherwise, see if this source was used for
5529 * multiple renames, in which case we decrement
5530 * the count, and call it a copy.
5531 */
5532 if (!strcmp(p->one->path, p->two->path))
5533 p->status = DIFF_STATUS_MODIFIED;
5534 else if (--p->one->rename_used > 0)
5535 p->status = DIFF_STATUS_COPIED;
5536 else
5537 p->status = DIFF_STATUS_RENAMED;
5538 }
5539 else if (!oideq(&p->one->oid, &p->two->oid) ||
5540 p->one->mode != p->two->mode ||
5541 p->one->dirty_submodule ||
5542 p->two->dirty_submodule ||
5543 is_null_oid(&p->one->oid))
5544 p->status = DIFF_STATUS_MODIFIED;
5545 else {
5546 /* This is a "no-change" entry and should not
5547 * happen anymore, but prepare for broken callers.
5548 */
5549 error("feeding unmodified %s to diffcore",
5550 p->one->path);
5551 p->status = DIFF_STATUS_UNKNOWN;
5552 }
5553 }
5554 diff_debug_queue("resolve-rename-copy done", q);
5555 }
5556
5557 static int check_pair_status(struct diff_filepair *p)
5558 {
5559 switch (p->status) {
5560 case DIFF_STATUS_UNKNOWN:
5561 return 0;
5562 case 0:
5563 die("internal error in diff-resolve-rename-copy");
5564 default:
5565 return 1;
5566 }
5567 }
5568
5569 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5570 {
5571 int fmt = opt->output_format;
5572
5573 if (fmt & DIFF_FORMAT_CHECKDIFF)
5574 diff_flush_checkdiff(p, opt);
5575 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5576 diff_flush_raw(p, opt);
5577 else if (fmt & DIFF_FORMAT_NAME) {
5578 const char *name_a, *name_b;
5579 name_a = p->two->path;
5580 name_b = NULL;
5581 strip_prefix(opt->prefix_length, &name_a, &name_b);
5582 fprintf(opt->file, "%s", diff_line_prefix(opt));
5583 write_name_quoted(name_a, opt->file, opt->line_termination);
5584 }
5585 }
5586
5587 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5588 {
5589 struct strbuf sb = STRBUF_INIT;
5590 if (fs->mode)
5591 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5592 else
5593 strbuf_addf(&sb, " %s ", newdelete);
5594
5595 quote_c_style(fs->path, &sb, NULL, 0);
5596 strbuf_addch(&sb, '\n');
5597 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5598 sb.buf, sb.len, 0);
5599 strbuf_release(&sb);
5600 }
5601
5602 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5603 int show_name)
5604 {
5605 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5606 struct strbuf sb = STRBUF_INIT;
5607 strbuf_addf(&sb, " mode change %06o => %06o",
5608 p->one->mode, p->two->mode);
5609 if (show_name) {
5610 strbuf_addch(&sb, ' ');
5611 quote_c_style(p->two->path, &sb, NULL, 0);
5612 }
5613 strbuf_addch(&sb, '\n');
5614 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5615 sb.buf, sb.len, 0);
5616 strbuf_release(&sb);
5617 }
5618 }
5619
5620 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5621 struct diff_filepair *p)
5622 {
5623 struct strbuf sb = STRBUF_INIT;
5624 struct strbuf names = STRBUF_INIT;
5625
5626 pprint_rename(&names, p->one->path, p->two->path);
5627 strbuf_addf(&sb, " %s %s (%d%%)\n",
5628 renamecopy, names.buf, similarity_index(p));
5629 strbuf_release(&names);
5630 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5631 sb.buf, sb.len, 0);
5632 show_mode_change(opt, p, 0);
5633 strbuf_release(&sb);
5634 }
5635
5636 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5637 {
5638 switch(p->status) {
5639 case DIFF_STATUS_DELETED:
5640 show_file_mode_name(opt, "delete", p->one);
5641 break;
5642 case DIFF_STATUS_ADDED:
5643 show_file_mode_name(opt, "create", p->two);
5644 break;
5645 case DIFF_STATUS_COPIED:
5646 show_rename_copy(opt, "copy", p);
5647 break;
5648 case DIFF_STATUS_RENAMED:
5649 show_rename_copy(opt, "rename", p);
5650 break;
5651 default:
5652 if (p->score) {
5653 struct strbuf sb = STRBUF_INIT;
5654 strbuf_addstr(&sb, " rewrite ");
5655 quote_c_style(p->two->path, &sb, NULL, 0);
5656 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5657 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5658 sb.buf, sb.len, 0);
5659 strbuf_release(&sb);
5660 }
5661 show_mode_change(opt, p, !p->score);
5662 break;
5663 }
5664 }
5665
5666 struct patch_id_t {
5667 git_SHA_CTX *ctx;
5668 int patchlen;
5669 };
5670
5671 static int remove_space(char *line, int len)
5672 {
5673 int i;
5674 char *dst = line;
5675 unsigned char c;
5676
5677 for (i = 0; i < len; i++)
5678 if (!isspace((c = line[i])))
5679 *dst++ = c;
5680
5681 return dst - line;
5682 }
5683
5684 static void patch_id_consume(void *priv, char *line, unsigned long len)
5685 {
5686 struct patch_id_t *data = priv;
5687 int new_len;
5688
5689 new_len = remove_space(line, len);
5690
5691 git_SHA1_Update(data->ctx, line, new_len);
5692 data->patchlen += new_len;
5693 }
5694
5695 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5696 {
5697 git_SHA1_Update(ctx, str, strlen(str));
5698 }
5699
5700 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5701 {
5702 /* large enough for 2^32 in octal */
5703 char buf[12];
5704 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5705 git_SHA1_Update(ctx, buf, len);
5706 }
5707
5708 /* returns 0 upon success, and writes result into sha1 */
5709 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5710 {
5711 struct diff_queue_struct *q = &diff_queued_diff;
5712 int i;
5713 git_SHA_CTX ctx;
5714 struct patch_id_t data;
5715
5716 git_SHA1_Init(&ctx);
5717 memset(&data, 0, sizeof(struct patch_id_t));
5718 data.ctx = &ctx;
5719
5720 for (i = 0; i < q->nr; i++) {
5721 xpparam_t xpp;
5722 xdemitconf_t xecfg;
5723 mmfile_t mf1, mf2;
5724 struct diff_filepair *p = q->queue[i];
5725 int len1, len2;
5726
5727 memset(&xpp, 0, sizeof(xpp));
5728 memset(&xecfg, 0, sizeof(xecfg));
5729 if (p->status == 0)
5730 return error("internal diff status error");
5731 if (p->status == DIFF_STATUS_UNKNOWN)
5732 continue;
5733 if (diff_unmodified_pair(p))
5734 continue;
5735 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5736 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5737 continue;
5738 if (DIFF_PAIR_UNMERGED(p))
5739 continue;
5740
5741 diff_fill_oid_info(p->one, options->repo->index);
5742 diff_fill_oid_info(p->two, options->repo->index);
5743
5744 len1 = remove_space(p->one->path, strlen(p->one->path));
5745 len2 = remove_space(p->two->path, strlen(p->two->path));
5746 patch_id_add_string(&ctx, "diff--git");
5747 patch_id_add_string(&ctx, "a/");
5748 git_SHA1_Update(&ctx, p->one->path, len1);
5749 patch_id_add_string(&ctx, "b/");
5750 git_SHA1_Update(&ctx, p->two->path, len2);
5751
5752 if (p->one->mode == 0) {
5753 patch_id_add_string(&ctx, "newfilemode");
5754 patch_id_add_mode(&ctx, p->two->mode);
5755 patch_id_add_string(&ctx, "---/dev/null");
5756 patch_id_add_string(&ctx, "+++b/");
5757 git_SHA1_Update(&ctx, p->two->path, len2);
5758 } else if (p->two->mode == 0) {
5759 patch_id_add_string(&ctx, "deletedfilemode");
5760 patch_id_add_mode(&ctx, p->one->mode);
5761 patch_id_add_string(&ctx, "---a/");
5762 git_SHA1_Update(&ctx, p->one->path, len1);
5763 patch_id_add_string(&ctx, "+++/dev/null");
5764 } else {
5765 patch_id_add_string(&ctx, "---a/");
5766 git_SHA1_Update(&ctx, p->one->path, len1);
5767 patch_id_add_string(&ctx, "+++b/");
5768 git_SHA1_Update(&ctx, p->two->path, len2);
5769 }
5770
5771 if (diff_header_only)
5772 continue;
5773
5774 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
5775 fill_mmfile(options->repo, &mf2, p->two) < 0)
5776 return error("unable to read files to diff");
5777
5778 if (diff_filespec_is_binary(options->repo, p->one) ||
5779 diff_filespec_is_binary(options->repo, p->two)) {
5780 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5781 GIT_SHA1_HEXSZ);
5782 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5783 GIT_SHA1_HEXSZ);
5784 continue;
5785 }
5786
5787 xpp.flags = 0;
5788 xecfg.ctxlen = 3;
5789 xecfg.flags = 0;
5790 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
5791 patch_id_consume, &data, &xpp, &xecfg))
5792 return error("unable to generate patch-id diff for %s",
5793 p->one->path);
5794 }
5795
5796 git_SHA1_Final(oid->hash, &ctx);
5797 return 0;
5798 }
5799
5800 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5801 {
5802 struct diff_queue_struct *q = &diff_queued_diff;
5803 int i;
5804 int result = diff_get_patch_id(options, oid, diff_header_only);
5805
5806 for (i = 0; i < q->nr; i++)
5807 diff_free_filepair(q->queue[i]);
5808
5809 free(q->queue);
5810 DIFF_QUEUE_CLEAR(q);
5811
5812 return result;
5813 }
5814
5815 static int is_summary_empty(const struct diff_queue_struct *q)
5816 {
5817 int i;
5818
5819 for (i = 0; i < q->nr; i++) {
5820 const struct diff_filepair *p = q->queue[i];
5821
5822 switch (p->status) {
5823 case DIFF_STATUS_DELETED:
5824 case DIFF_STATUS_ADDED:
5825 case DIFF_STATUS_COPIED:
5826 case DIFF_STATUS_RENAMED:
5827 return 0;
5828 default:
5829 if (p->score)
5830 return 0;
5831 if (p->one->mode && p->two->mode &&
5832 p->one->mode != p->two->mode)
5833 return 0;
5834 break;
5835 }
5836 }
5837 return 1;
5838 }
5839
5840 static const char rename_limit_warning[] =
5841 N_("inexact rename detection was skipped due to too many files.");
5842
5843 static const char degrade_cc_to_c_warning[] =
5844 N_("only found copies from modified paths due to too many files.");
5845
5846 static const char rename_limit_advice[] =
5847 N_("you may want to set your %s variable to at least "
5848 "%d and retry the command.");
5849
5850 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5851 {
5852 fflush(stdout);
5853 if (degraded_cc)
5854 warning(_(degrade_cc_to_c_warning));
5855 else if (needed)
5856 warning(_(rename_limit_warning));
5857 else
5858 return;
5859 if (0 < needed)
5860 warning(_(rename_limit_advice), varname, needed);
5861 }
5862
5863 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5864 {
5865 int i;
5866 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5867 struct diff_queue_struct *q = &diff_queued_diff;
5868
5869 if (WSEH_NEW & WS_RULE_MASK)
5870 BUG("WS rules bit mask overlaps with diff symbol flags");
5871
5872 if (o->color_moved)
5873 o->emitted_symbols = &esm;
5874
5875 for (i = 0; i < q->nr; i++) {
5876 struct diff_filepair *p = q->queue[i];
5877 if (check_pair_status(p))
5878 diff_flush_patch(p, o);
5879 }
5880
5881 if (o->emitted_symbols) {
5882 if (o->color_moved) {
5883 struct hashmap add_lines, del_lines;
5884
5885 if (o->color_moved_ws_handling &
5886 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5887 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5888
5889 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5890 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5891
5892 add_lines_to_move_detection(o, &add_lines, &del_lines);
5893 mark_color_as_moved(o, &add_lines, &del_lines);
5894 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5895 dim_moved_lines(o);
5896
5897 hashmap_free(&add_lines, 1);
5898 hashmap_free(&del_lines, 1);
5899 }
5900
5901 for (i = 0; i < esm.nr; i++)
5902 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5903
5904 for (i = 0; i < esm.nr; i++)
5905 free((void *)esm.buf[i].line);
5906 }
5907 esm.nr = 0;
5908 }
5909
5910 void diff_flush(struct diff_options *options)
5911 {
5912 struct diff_queue_struct *q = &diff_queued_diff;
5913 int i, output_format = options->output_format;
5914 int separator = 0;
5915 int dirstat_by_line = 0;
5916
5917 /*
5918 * Order: raw, stat, summary, patch
5919 * or: name/name-status/checkdiff (other bits clear)
5920 */
5921 if (!q->nr)
5922 goto free_queue;
5923
5924 if (output_format & (DIFF_FORMAT_RAW |
5925 DIFF_FORMAT_NAME |
5926 DIFF_FORMAT_NAME_STATUS |
5927 DIFF_FORMAT_CHECKDIFF)) {
5928 for (i = 0; i < q->nr; i++) {
5929 struct diff_filepair *p = q->queue[i];
5930 if (check_pair_status(p))
5931 flush_one_pair(p, options);
5932 }
5933 separator++;
5934 }
5935
5936 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5937 dirstat_by_line = 1;
5938
5939 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5940 dirstat_by_line) {
5941 struct diffstat_t diffstat;
5942
5943 memset(&diffstat, 0, sizeof(struct diffstat_t));
5944 for (i = 0; i < q->nr; i++) {
5945 struct diff_filepair *p = q->queue[i];
5946 if (check_pair_status(p))
5947 diff_flush_stat(p, options, &diffstat);
5948 }
5949 if (output_format & DIFF_FORMAT_NUMSTAT)
5950 show_numstat(&diffstat, options);
5951 if (output_format & DIFF_FORMAT_DIFFSTAT)
5952 show_stats(&diffstat, options);
5953 if (output_format & DIFF_FORMAT_SHORTSTAT)
5954 show_shortstats(&diffstat, options);
5955 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5956 show_dirstat_by_line(&diffstat, options);
5957 free_diffstat_info(&diffstat);
5958 separator++;
5959 }
5960 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5961 show_dirstat(options);
5962
5963 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5964 for (i = 0; i < q->nr; i++) {
5965 diff_summary(options, q->queue[i]);
5966 }
5967 separator++;
5968 }
5969
5970 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5971 options->flags.exit_with_status &&
5972 options->flags.diff_from_contents) {
5973 /*
5974 * run diff_flush_patch for the exit status. setting
5975 * options->file to /dev/null should be safe, because we
5976 * aren't supposed to produce any output anyway.
5977 */
5978 if (options->close_file)
5979 fclose(options->file);
5980 options->file = xfopen("/dev/null", "w");
5981 options->close_file = 1;
5982 options->color_moved = 0;
5983 for (i = 0; i < q->nr; i++) {
5984 struct diff_filepair *p = q->queue[i];
5985 if (check_pair_status(p))
5986 diff_flush_patch(p, options);
5987 if (options->found_changes)
5988 break;
5989 }
5990 }
5991
5992 if (output_format & DIFF_FORMAT_PATCH) {
5993 if (separator) {
5994 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5995 if (options->stat_sep)
5996 /* attach patch instead of inline */
5997 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5998 NULL, 0, 0);
5999 }
6000
6001 diff_flush_patch_all_file_pairs(options);
6002 }
6003
6004 if (output_format & DIFF_FORMAT_CALLBACK)
6005 options->format_callback(q, options, options->format_callback_data);
6006
6007 for (i = 0; i < q->nr; i++)
6008 diff_free_filepair(q->queue[i]);
6009 free_queue:
6010 free(q->queue);
6011 DIFF_QUEUE_CLEAR(q);
6012 if (options->close_file)
6013 fclose(options->file);
6014
6015 /*
6016 * Report the content-level differences with HAS_CHANGES;
6017 * diff_addremove/diff_change does not set the bit when
6018 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6019 */
6020 if (options->flags.diff_from_contents) {
6021 if (options->found_changes)
6022 options->flags.has_changes = 1;
6023 else
6024 options->flags.has_changes = 0;
6025 }
6026 }
6027
6028 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6029 {
6030 return (((p->status == DIFF_STATUS_MODIFIED) &&
6031 ((p->score &&
6032 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6033 (!p->score &&
6034 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6035 ((p->status != DIFF_STATUS_MODIFIED) &&
6036 filter_bit_tst(p->status, options)));
6037 }
6038
6039 static void diffcore_apply_filter(struct diff_options *options)
6040 {
6041 int i;
6042 struct diff_queue_struct *q = &diff_queued_diff;
6043 struct diff_queue_struct outq;
6044
6045 DIFF_QUEUE_CLEAR(&outq);
6046
6047 if (!options->filter)
6048 return;
6049
6050 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6051 int found;
6052 for (i = found = 0; !found && i < q->nr; i++) {
6053 if (match_filter(options, q->queue[i]))
6054 found++;
6055 }
6056 if (found)
6057 return;
6058
6059 /* otherwise we will clear the whole queue
6060 * by copying the empty outq at the end of this
6061 * function, but first clear the current entries
6062 * in the queue.
6063 */
6064 for (i = 0; i < q->nr; i++)
6065 diff_free_filepair(q->queue[i]);
6066 }
6067 else {
6068 /* Only the matching ones */
6069 for (i = 0; i < q->nr; i++) {
6070 struct diff_filepair *p = q->queue[i];
6071 if (match_filter(options, p))
6072 diff_q(&outq, p);
6073 else
6074 diff_free_filepair(p);
6075 }
6076 }
6077 free(q->queue);
6078 *q = outq;
6079 }
6080
6081 /* Check whether two filespecs with the same mode and size are identical */
6082 static int diff_filespec_is_identical(struct repository *r,
6083 struct diff_filespec *one,
6084 struct diff_filespec *two)
6085 {
6086 if (S_ISGITLINK(one->mode))
6087 return 0;
6088 if (diff_populate_filespec(r, one, 0))
6089 return 0;
6090 if (diff_populate_filespec(r, two, 0))
6091 return 0;
6092 return !memcmp(one->data, two->data, one->size);
6093 }
6094
6095 static int diff_filespec_check_stat_unmatch(struct repository *r,
6096 struct diff_filepair *p)
6097 {
6098 if (p->done_skip_stat_unmatch)
6099 return p->skip_stat_unmatch_result;
6100
6101 p->done_skip_stat_unmatch = 1;
6102 p->skip_stat_unmatch_result = 0;
6103 /*
6104 * 1. Entries that come from stat info dirtiness
6105 * always have both sides (iow, not create/delete),
6106 * one side of the object name is unknown, with
6107 * the same mode and size. Keep the ones that
6108 * do not match these criteria. They have real
6109 * differences.
6110 *
6111 * 2. At this point, the file is known to be modified,
6112 * with the same mode and size, and the object
6113 * name of one side is unknown. Need to inspect
6114 * the identical contents.
6115 */
6116 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6117 !DIFF_FILE_VALID(p->two) ||
6118 (p->one->oid_valid && p->two->oid_valid) ||
6119 (p->one->mode != p->two->mode) ||
6120 diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
6121 diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
6122 (p->one->size != p->two->size) ||
6123 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6124 p->skip_stat_unmatch_result = 1;
6125 return p->skip_stat_unmatch_result;
6126 }
6127
6128 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6129 {
6130 int i;
6131 struct diff_queue_struct *q = &diff_queued_diff;
6132 struct diff_queue_struct outq;
6133 DIFF_QUEUE_CLEAR(&outq);
6134
6135 for (i = 0; i < q->nr; i++) {
6136 struct diff_filepair *p = q->queue[i];
6137
6138 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6139 diff_q(&outq, p);
6140 else {
6141 /*
6142 * The caller can subtract 1 from skip_stat_unmatch
6143 * to determine how many paths were dirty only
6144 * due to stat info mismatch.
6145 */
6146 if (!diffopt->flags.no_index)
6147 diffopt->skip_stat_unmatch++;
6148 diff_free_filepair(p);
6149 }
6150 }
6151 free(q->queue);
6152 *q = outq;
6153 }
6154
6155 static int diffnamecmp(const void *a_, const void *b_)
6156 {
6157 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6158 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6159 const char *name_a, *name_b;
6160
6161 name_a = a->one ? a->one->path : a->two->path;
6162 name_b = b->one ? b->one->path : b->two->path;
6163 return strcmp(name_a, name_b);
6164 }
6165
6166 void diffcore_fix_diff_index(struct diff_options *options)
6167 {
6168 struct diff_queue_struct *q = &diff_queued_diff;
6169 QSORT(q->queue, q->nr, diffnamecmp);
6170 }
6171
6172 void diffcore_std(struct diff_options *options)
6173 {
6174 /* NOTE please keep the following in sync with diff_tree_combined() */
6175 if (options->skip_stat_unmatch)
6176 diffcore_skip_stat_unmatch(options);
6177 if (!options->found_follow) {
6178 /* See try_to_follow_renames() in tree-diff.c */
6179 if (options->break_opt != -1)
6180 diffcore_break(options->repo,
6181 options->break_opt);
6182 if (options->detect_rename)
6183 diffcore_rename(options);
6184 if (options->break_opt != -1)
6185 diffcore_merge_broken();
6186 }
6187 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6188 diffcore_pickaxe(options);
6189 if (options->orderfile)
6190 diffcore_order(options->orderfile);
6191 if (!options->found_follow)
6192 /* See try_to_follow_renames() in tree-diff.c */
6193 diff_resolve_rename_copy();
6194 diffcore_apply_filter(options);
6195
6196 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6197 options->flags.has_changes = 1;
6198 else
6199 options->flags.has_changes = 0;
6200
6201 options->found_follow = 0;
6202 }
6203
6204 int diff_result_code(struct diff_options *opt, int status)
6205 {
6206 int result = 0;
6207
6208 diff_warn_rename_limit("diff.renameLimit",
6209 opt->needed_rename_limit,
6210 opt->degraded_cc_to_c);
6211 if (!opt->flags.exit_with_status &&
6212 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6213 return status;
6214 if (opt->flags.exit_with_status &&
6215 opt->flags.has_changes)
6216 result |= 01;
6217 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6218 opt->flags.check_failed)
6219 result |= 02;
6220 return result;
6221 }
6222
6223 int diff_can_quit_early(struct diff_options *opt)
6224 {
6225 return (opt->flags.quick &&
6226 !opt->filter &&
6227 opt->flags.has_changes);
6228 }
6229
6230 /*
6231 * Shall changes to this submodule be ignored?
6232 *
6233 * Submodule changes can be configured to be ignored separately for each path,
6234 * but that configuration can be overridden from the command line.
6235 */
6236 static int is_submodule_ignored(const char *path, struct diff_options *options)
6237 {
6238 int ignored = 0;
6239 struct diff_flags orig_flags = options->flags;
6240 if (!options->flags.override_submodule_config)
6241 set_diffopt_flags_from_submodule_config(options, path);
6242 if (options->flags.ignore_submodules)
6243 ignored = 1;
6244 options->flags = orig_flags;
6245 return ignored;
6246 }
6247
6248 void diff_addremove(struct diff_options *options,
6249 int addremove, unsigned mode,
6250 const struct object_id *oid,
6251 int oid_valid,
6252 const char *concatpath, unsigned dirty_submodule)
6253 {
6254 struct diff_filespec *one, *two;
6255
6256 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6257 return;
6258
6259 /* This may look odd, but it is a preparation for
6260 * feeding "there are unchanged files which should
6261 * not produce diffs, but when you are doing copy
6262 * detection you would need them, so here they are"
6263 * entries to the diff-core. They will be prefixed
6264 * with something like '=' or '*' (I haven't decided
6265 * which but should not make any difference).
6266 * Feeding the same new and old to diff_change()
6267 * also has the same effect.
6268 * Before the final output happens, they are pruned after
6269 * merged into rename/copy pairs as appropriate.
6270 */
6271 if (options->flags.reverse_diff)
6272 addremove = (addremove == '+' ? '-' :
6273 addremove == '-' ? '+' : addremove);
6274
6275 if (options->prefix &&
6276 strncmp(concatpath, options->prefix, options->prefix_length))
6277 return;
6278
6279 one = alloc_filespec(concatpath);
6280 two = alloc_filespec(concatpath);
6281
6282 if (addremove != '+')
6283 fill_filespec(one, oid, oid_valid, mode);
6284 if (addremove != '-') {
6285 fill_filespec(two, oid, oid_valid, mode);
6286 two->dirty_submodule = dirty_submodule;
6287 }
6288
6289 diff_queue(&diff_queued_diff, one, two);
6290 if (!options->flags.diff_from_contents)
6291 options->flags.has_changes = 1;
6292 }
6293
6294 void diff_change(struct diff_options *options,
6295 unsigned old_mode, unsigned new_mode,
6296 const struct object_id *old_oid,
6297 const struct object_id *new_oid,
6298 int old_oid_valid, int new_oid_valid,
6299 const char *concatpath,
6300 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6301 {
6302 struct diff_filespec *one, *two;
6303 struct diff_filepair *p;
6304
6305 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6306 is_submodule_ignored(concatpath, options))
6307 return;
6308
6309 if (options->flags.reverse_diff) {
6310 SWAP(old_mode, new_mode);
6311 SWAP(old_oid, new_oid);
6312 SWAP(old_oid_valid, new_oid_valid);
6313 SWAP(old_dirty_submodule, new_dirty_submodule);
6314 }
6315
6316 if (options->prefix &&
6317 strncmp(concatpath, options->prefix, options->prefix_length))
6318 return;
6319
6320 one = alloc_filespec(concatpath);
6321 two = alloc_filespec(concatpath);
6322 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6323 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6324 one->dirty_submodule = old_dirty_submodule;
6325 two->dirty_submodule = new_dirty_submodule;
6326 p = diff_queue(&diff_queued_diff, one, two);
6327
6328 if (options->flags.diff_from_contents)
6329 return;
6330
6331 if (options->flags.quick && options->skip_stat_unmatch &&
6332 !diff_filespec_check_stat_unmatch(options->repo, p))
6333 return;
6334
6335 options->flags.has_changes = 1;
6336 }
6337
6338 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6339 {
6340 struct diff_filepair *pair;
6341 struct diff_filespec *one, *two;
6342
6343 if (options->prefix &&
6344 strncmp(path, options->prefix, options->prefix_length))
6345 return NULL;
6346
6347 one = alloc_filespec(path);
6348 two = alloc_filespec(path);
6349 pair = diff_queue(&diff_queued_diff, one, two);
6350 pair->is_unmerged = 1;
6351 return pair;
6352 }
6353
6354 static char *run_textconv(struct repository *r,
6355 const char *pgm,
6356 struct diff_filespec *spec,
6357 size_t *outsize)
6358 {
6359 struct diff_tempfile *temp;
6360 const char *argv[3];
6361 const char **arg = argv;
6362 struct child_process child = CHILD_PROCESS_INIT;
6363 struct strbuf buf = STRBUF_INIT;
6364 int err = 0;
6365
6366 temp = prepare_temp_file(r, spec->path, spec);
6367 *arg++ = pgm;
6368 *arg++ = temp->name;
6369 *arg = NULL;
6370
6371 child.use_shell = 1;
6372 child.argv = argv;
6373 child.out = -1;
6374 if (start_command(&child)) {
6375 remove_tempfile();
6376 return NULL;
6377 }
6378
6379 if (strbuf_read(&buf, child.out, 0) < 0)
6380 err = error("error reading from textconv command '%s'", pgm);
6381 close(child.out);
6382
6383 if (finish_command(&child) || err) {
6384 strbuf_release(&buf);
6385 remove_tempfile();
6386 return NULL;
6387 }
6388 remove_tempfile();
6389
6390 return strbuf_detach(&buf, outsize);
6391 }
6392
6393 size_t fill_textconv(struct repository *r,
6394 struct userdiff_driver *driver,
6395 struct diff_filespec *df,
6396 char **outbuf)
6397 {
6398 size_t size;
6399
6400 if (!driver) {
6401 if (!DIFF_FILE_VALID(df)) {
6402 *outbuf = "";
6403 return 0;
6404 }
6405 if (diff_populate_filespec(r, df, 0))
6406 die("unable to read files to diff");
6407 *outbuf = df->data;
6408 return df->size;
6409 }
6410
6411 if (!driver->textconv)
6412 BUG("fill_textconv called with non-textconv driver");
6413
6414 if (driver->textconv_cache && df->oid_valid) {
6415 *outbuf = notes_cache_get(driver->textconv_cache,
6416 &df->oid,
6417 &size);
6418 if (*outbuf)
6419 return size;
6420 }
6421
6422 *outbuf = run_textconv(r, driver->textconv, df, &size);
6423 if (!*outbuf)
6424 die("unable to read files to diff");
6425
6426 if (driver->textconv_cache && df->oid_valid) {
6427 /* ignore errors, as we might be in a readonly repository */
6428 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6429 size);
6430 /*
6431 * we could save up changes and flush them all at the end,
6432 * but we would need an extra call after all diffing is done.
6433 * Since generating a cache entry is the slow path anyway,
6434 * this extra overhead probably isn't a big deal.
6435 */
6436 notes_cache_write(driver->textconv_cache);
6437 }
6438
6439 return size;
6440 }
6441
6442 int textconv_object(struct repository *r,
6443 const char *path,
6444 unsigned mode,
6445 const struct object_id *oid,
6446 int oid_valid,
6447 char **buf,
6448 unsigned long *buf_size)
6449 {
6450 struct diff_filespec *df;
6451 struct userdiff_driver *textconv;
6452
6453 df = alloc_filespec(path);
6454 fill_filespec(df, oid, oid_valid, mode);
6455 textconv = get_textconv(r->index, df);
6456 if (!textconv) {
6457 free_filespec(df);
6458 return 0;
6459 }
6460
6461 *buf_size = fill_textconv(r, textconv, df, buf);
6462 free_filespec(df);
6463 return 1;
6464 }
6465
6466 void setup_diff_pager(struct diff_options *opt)
6467 {
6468 /*
6469 * If the user asked for our exit code, then either they want --quiet
6470 * or --exit-code. We should definitely not bother with a pager in the
6471 * former case, as we will generate no output. Since we still properly
6472 * report our exit code even when a pager is run, we _could_ run a
6473 * pager with --exit-code. But since we have not done so historically,
6474 * and because it is easy to find people oneline advising "git diff
6475 * --exit-code" in hooks and other scripts, we do not do so.
6476 */
6477 if (!opt->flags.exit_with_status &&
6478 check_pager_config("diff") != 0)
6479 setup_pager();
6480 }
Unnamed repository; edit this file 'description' to name the repository.