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