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