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