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range-diff --dual-color: skip white-space warnings
[git.git] / diff.c
blobea8ecae0417b76645a706ae21297bf6a134ea3c9
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "tempfile.h"
7 #include "quote.h"
8 #include "diff.h"
9 #include "diffcore.h"
10 #include "delta.h"
11 #include "xdiff-interface.h"
12 #include "color.h"
13 #include "attr.h"
14 #include "run-command.h"
15 #include "utf8.h"
16 #include "object-store.h"
17 #include "userdiff.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "hashmap.h"
21 #include "ll-merge.h"
22 #include "string-list.h"
23 #include "argv-array.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "help.h"
27
28 #ifdef NO_FAST_WORKING_DIRECTORY
29 #define FAST_WORKING_DIRECTORY 0
30 #else
31 #define FAST_WORKING_DIRECTORY 1
32 #endif
33
34 static int diff_detect_rename_default;
35 static int diff_indent_heuristic = 1;
36 static int diff_rename_limit_default = 400;
37 static int diff_suppress_blank_empty;
38 static int diff_use_color_default = -1;
39 static int diff_color_moved_default;
40 static int diff_color_moved_ws_default;
41 static int diff_context_default = 3;
42 static int diff_interhunk_context_default;
43 static const char *diff_word_regex_cfg;
44 static const char *external_diff_cmd_cfg;
45 static const char *diff_order_file_cfg;
46 int diff_auto_refresh_index = 1;
47 static int diff_mnemonic_prefix;
48 static int diff_no_prefix;
49 static int diff_stat_graph_width;
50 static int diff_dirstat_permille_default = 30;
51 static struct diff_options default_diff_options;
52 static long diff_algorithm;
53 static unsigned ws_error_highlight_default = WSEH_NEW;
54
55 static char diff_colors[][COLOR_MAXLEN] = {
56 GIT_COLOR_RESET,
57 GIT_COLOR_NORMAL, /* CONTEXT */
58 GIT_COLOR_BOLD, /* METAINFO */
59 GIT_COLOR_CYAN, /* FRAGINFO */
60 GIT_COLOR_RED, /* OLD */
61 GIT_COLOR_GREEN, /* NEW */
62 GIT_COLOR_YELLOW, /* COMMIT */
63 GIT_COLOR_BG_RED, /* WHITESPACE */
64 GIT_COLOR_NORMAL, /* FUNCINFO */
65 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
66 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
67 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
68 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
69 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
70 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
71 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
72 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
73 };
74
75 static const char *color_diff_slots[] = {
76 [DIFF_CONTEXT] = "context",
77 [DIFF_METAINFO] = "meta",
78 [DIFF_FRAGINFO] = "frag",
79 [DIFF_FILE_OLD] = "old",
80 [DIFF_FILE_NEW] = "new",
81 [DIFF_COMMIT] = "commit",
82 [DIFF_WHITESPACE] = "whitespace",
83 [DIFF_FUNCINFO] = "func",
84 [DIFF_FILE_OLD_MOVED] = "oldMoved",
85 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
86 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
87 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
88 [DIFF_FILE_NEW_MOVED] = "newMoved",
89 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
90 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
91 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
92 };
93
94 static NORETURN void die_want_option(const char *option_name)
95 {
96 die(_("option '%s' requires a value"), option_name);
97 }
98
99 define_list_config_array_extra(color_diff_slots, {"plain"});
100
101 static int parse_diff_color_slot(const char *var)
102 {
103 if (!strcasecmp(var, "plain"))
104 return DIFF_CONTEXT;
105 return LOOKUP_CONFIG(color_diff_slots, var);
106 }
107
108 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
109 struct strbuf *errmsg)
110 {
111 char *params_copy = xstrdup(params_string);
112 struct string_list params = STRING_LIST_INIT_NODUP;
113 int ret = 0;
114 int i;
115
116 if (*params_copy)
117 string_list_split_in_place(&params, params_copy, ',', -1);
118 for (i = 0; i < params.nr; i++) {
119 const char *p = params.items[i].string;
120 if (!strcmp(p, "changes")) {
121 options->flags.dirstat_by_line = 0;
122 options->flags.dirstat_by_file = 0;
123 } else if (!strcmp(p, "lines")) {
124 options->flags.dirstat_by_line = 1;
125 options->flags.dirstat_by_file = 0;
126 } else if (!strcmp(p, "files")) {
127 options->flags.dirstat_by_line = 0;
128 options->flags.dirstat_by_file = 1;
129 } else if (!strcmp(p, "noncumulative")) {
130 options->flags.dirstat_cumulative = 0;
131 } else if (!strcmp(p, "cumulative")) {
132 options->flags.dirstat_cumulative = 1;
133 } else if (isdigit(*p)) {
134 char *end;
135 int permille = strtoul(p, &end, 10) * 10;
136 if (*end == '.' && isdigit(*++end)) {
137 /* only use first digit */
138 permille += *end - '0';
139 /* .. and ignore any further digits */
140 while (isdigit(*++end))
141 ; /* nothing */
142 }
143 if (!*end)
144 options->dirstat_permille = permille;
145 else {
146 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
147 p);
148 ret++;
149 }
150 } else {
151 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
152 ret++;
153 }
154
155 }
156 string_list_clear(&params, 0);
157 free(params_copy);
158 return ret;
159 }
160
161 static int parse_submodule_params(struct diff_options *options, const char *value)
162 {
163 if (!strcmp(value, "log"))
164 options->submodule_format = DIFF_SUBMODULE_LOG;
165 else if (!strcmp(value, "short"))
166 options->submodule_format = DIFF_SUBMODULE_SHORT;
167 else if (!strcmp(value, "diff"))
168 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
169 else
170 return -1;
171 return 0;
172 }
173
174 int git_config_rename(const char *var, const char *value)
175 {
176 if (!value)
177 return DIFF_DETECT_RENAME;
178 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
179 return DIFF_DETECT_COPY;
180 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
181 }
182
183 long parse_algorithm_value(const char *value)
184 {
185 if (!value)
186 return -1;
187 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
188 return 0;
189 else if (!strcasecmp(value, "minimal"))
190 return XDF_NEED_MINIMAL;
191 else if (!strcasecmp(value, "patience"))
192 return XDF_PATIENCE_DIFF;
193 else if (!strcasecmp(value, "histogram"))
194 return XDF_HISTOGRAM_DIFF;
195 return -1;
196 }
197
198 static int parse_one_token(const char **arg, const char *token)
199 {
200 const char *rest;
201 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
202 *arg = rest;
203 return 1;
204 }
205 return 0;
206 }
207
208 static int parse_ws_error_highlight(const char *arg)
209 {
210 const char *orig_arg = arg;
211 unsigned val = 0;
212
213 while (*arg) {
214 if (parse_one_token(&arg, "none"))
215 val = 0;
216 else if (parse_one_token(&arg, "default"))
217 val = WSEH_NEW;
218 else if (parse_one_token(&arg, "all"))
219 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
220 else if (parse_one_token(&arg, "new"))
221 val |= WSEH_NEW;
222 else if (parse_one_token(&arg, "old"))
223 val |= WSEH_OLD;
224 else if (parse_one_token(&arg, "context"))
225 val |= WSEH_CONTEXT;
226 else {
227 return -1 - (int)(arg - orig_arg);
228 }
229 if (*arg)
230 arg++;
231 }
232 return val;
233 }
234
235 /*
236 * These are to give UI layer defaults.
237 * The core-level commands such as git-diff-files should
238 * never be affected by the setting of diff.renames
239 * the user happens to have in the configuration file.
240 */
241 void init_diff_ui_defaults(void)
242 {
243 diff_detect_rename_default = DIFF_DETECT_RENAME;
244 }
245
246 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
247 {
248 if (!strcmp(var, "diff.indentheuristic"))
249 diff_indent_heuristic = git_config_bool(var, value);
250 return 0;
251 }
252
253 static int parse_color_moved(const char *arg)
254 {
255 switch (git_parse_maybe_bool(arg)) {
256 case 0:
257 return COLOR_MOVED_NO;
258 case 1:
259 return COLOR_MOVED_DEFAULT;
260 default:
261 break;
262 }
263
264 if (!strcmp(arg, "no"))
265 return COLOR_MOVED_NO;
266 else if (!strcmp(arg, "plain"))
267 return COLOR_MOVED_PLAIN;
268 else if (!strcmp(arg, "blocks"))
269 return COLOR_MOVED_BLOCKS;
270 else if (!strcmp(arg, "zebra"))
271 return COLOR_MOVED_ZEBRA;
272 else if (!strcmp(arg, "default"))
273 return COLOR_MOVED_DEFAULT;
274 else if (!strcmp(arg, "dimmed_zebra"))
275 return COLOR_MOVED_ZEBRA_DIM;
276 else
277 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed_zebra', 'plain'"));
278 }
279
280 static int parse_color_moved_ws(const char *arg)
281 {
282 int ret = 0;
283 struct string_list l = STRING_LIST_INIT_DUP;
284 struct string_list_item *i;
285
286 string_list_split(&l, arg, ',', -1);
287
288 for_each_string_list_item(i, &l) {
289 struct strbuf sb = STRBUF_INIT;
290 strbuf_addstr(&sb, i->string);
291 strbuf_trim(&sb);
292
293 if (!strcmp(sb.buf, "ignore-space-change"))
294 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
295 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
296 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
297 else if (!strcmp(sb.buf, "ignore-all-space"))
298 ret |= XDF_IGNORE_WHITESPACE;
299 else if (!strcmp(sb.buf, "allow-indentation-change"))
300 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
301 else
302 error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
303
304 strbuf_release(&sb);
305 }
306
307 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
308 (ret & XDF_WHITESPACE_FLAGS))
309 die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
310
311 string_list_clear(&l, 0);
312
313 return ret;
314 }
315
316 int git_diff_ui_config(const char *var, const char *value, void *cb)
317 {
318 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
319 diff_use_color_default = git_config_colorbool(var, value);
320 return 0;
321 }
322 if (!strcmp(var, "diff.colormoved")) {
323 int cm = parse_color_moved(value);
324 if (cm < 0)
325 return -1;
326 diff_color_moved_default = cm;
327 return 0;
328 }
329 if (!strcmp(var, "diff.colormovedws")) {
330 int cm = parse_color_moved_ws(value);
331 if (cm < 0)
332 return -1;
333 diff_color_moved_ws_default = cm;
334 return 0;
335 }
336 if (!strcmp(var, "diff.context")) {
337 diff_context_default = git_config_int(var, value);
338 if (diff_context_default < 0)
339 return -1;
340 return 0;
341 }
342 if (!strcmp(var, "diff.interhunkcontext")) {
343 diff_interhunk_context_default = git_config_int(var, value);
344 if (diff_interhunk_context_default < 0)
345 return -1;
346 return 0;
347 }
348 if (!strcmp(var, "diff.renames")) {
349 diff_detect_rename_default = git_config_rename(var, value);
350 return 0;
351 }
352 if (!strcmp(var, "diff.autorefreshindex")) {
353 diff_auto_refresh_index = git_config_bool(var, value);
354 return 0;
355 }
356 if (!strcmp(var, "diff.mnemonicprefix")) {
357 diff_mnemonic_prefix = git_config_bool(var, value);
358 return 0;
359 }
360 if (!strcmp(var, "diff.noprefix")) {
361 diff_no_prefix = git_config_bool(var, value);
362 return 0;
363 }
364 if (!strcmp(var, "diff.statgraphwidth")) {
365 diff_stat_graph_width = git_config_int(var, value);
366 return 0;
367 }
368 if (!strcmp(var, "diff.external"))
369 return git_config_string(&external_diff_cmd_cfg, var, value);
370 if (!strcmp(var, "diff.wordregex"))
371 return git_config_string(&diff_word_regex_cfg, var, value);
372 if (!strcmp(var, "diff.orderfile"))
373 return git_config_pathname(&diff_order_file_cfg, var, value);
374
375 if (!strcmp(var, "diff.ignoresubmodules"))
376 handle_ignore_submodules_arg(&default_diff_options, value);
377
378 if (!strcmp(var, "diff.submodule")) {
379 if (parse_submodule_params(&default_diff_options, value))
380 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
381 value);
382 return 0;
383 }
384
385 if (!strcmp(var, "diff.algorithm")) {
386 diff_algorithm = parse_algorithm_value(value);
387 if (diff_algorithm < 0)
388 return -1;
389 return 0;
390 }
391
392 if (!strcmp(var, "diff.wserrorhighlight")) {
393 int val = parse_ws_error_highlight(value);
394 if (val < 0)
395 return -1;
396 ws_error_highlight_default = val;
397 return 0;
398 }
399
400 if (git_color_config(var, value, cb) < 0)
401 return -1;
402
403 return git_diff_basic_config(var, value, cb);
404 }
405
406 int git_diff_basic_config(const char *var, const char *value, void *cb)
407 {
408 const char *name;
409
410 if (!strcmp(var, "diff.renamelimit")) {
411 diff_rename_limit_default = git_config_int(var, value);
412 return 0;
413 }
414
415 if (userdiff_config(var, value) < 0)
416 return -1;
417
418 if (skip_prefix(var, "diff.color.", &name) ||
419 skip_prefix(var, "color.diff.", &name)) {
420 int slot = parse_diff_color_slot(name);
421 if (slot < 0)
422 return 0;
423 if (!value)
424 return config_error_nonbool(var);
425 return color_parse(value, diff_colors[slot]);
426 }
427
428 /* like GNU diff's --suppress-blank-empty option */
429 if (!strcmp(var, "diff.suppressblankempty") ||
430 /* for backwards compatibility */
431 !strcmp(var, "diff.suppress-blank-empty")) {
432 diff_suppress_blank_empty = git_config_bool(var, value);
433 return 0;
434 }
435
436 if (!strcmp(var, "diff.dirstat")) {
437 struct strbuf errmsg = STRBUF_INIT;
438 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
439 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
440 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
441 errmsg.buf);
442 strbuf_release(&errmsg);
443 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
444 return 0;
445 }
446
447 if (git_diff_heuristic_config(var, value, cb) < 0)
448 return -1;
449
450 return git_default_config(var, value, cb);
451 }
452
453 static char *quote_two(const char *one, const char *two)
454 {
455 int need_one = quote_c_style(one, NULL, NULL, 1);
456 int need_two = quote_c_style(two, NULL, NULL, 1);
457 struct strbuf res = STRBUF_INIT;
458
459 if (need_one + need_two) {
460 strbuf_addch(&res, '"');
461 quote_c_style(one, &res, NULL, 1);
462 quote_c_style(two, &res, NULL, 1);
463 strbuf_addch(&res, '"');
464 } else {
465 strbuf_addstr(&res, one);
466 strbuf_addstr(&res, two);
467 }
468 return strbuf_detach(&res, NULL);
469 }
470
471 static const char *external_diff(void)
472 {
473 static const char *external_diff_cmd = NULL;
474 static int done_preparing = 0;
475
476 if (done_preparing)
477 return external_diff_cmd;
478 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
479 if (!external_diff_cmd)
480 external_diff_cmd = external_diff_cmd_cfg;
481 done_preparing = 1;
482 return external_diff_cmd;
483 }
484
485 /*
486 * Keep track of files used for diffing. Sometimes such an entry
487 * refers to a temporary file, sometimes to an existing file, and
488 * sometimes to "/dev/null".
489 */
490 static struct diff_tempfile {
491 /*
492 * filename external diff should read from, or NULL if this
493 * entry is currently not in use:
494 */
495 const char *name;
496
497 char hex[GIT_MAX_HEXSZ + 1];
498 char mode[10];
499
500 /*
501 * If this diff_tempfile instance refers to a temporary file,
502 * this tempfile object is used to manage its lifetime.
503 */
504 struct tempfile *tempfile;
505 } diff_temp[2];
506
507 struct emit_callback {
508 int color_diff;
509 unsigned ws_rule;
510 int blank_at_eof_in_preimage;
511 int blank_at_eof_in_postimage;
512 int lno_in_preimage;
513 int lno_in_postimage;
514 const char **label_path;
515 struct diff_words_data *diff_words;
516 struct diff_options *opt;
517 struct strbuf *header;
518 };
519
520 static int count_lines(const char *data, int size)
521 {
522 int count, ch, completely_empty = 1, nl_just_seen = 0;
523 count = 0;
524 while (0 < size--) {
525 ch = *data++;
526 if (ch == '\n') {
527 count++;
528 nl_just_seen = 1;
529 completely_empty = 0;
530 }
531 else {
532 nl_just_seen = 0;
533 completely_empty = 0;
534 }
535 }
536 if (completely_empty)
537 return 0;
538 if (!nl_just_seen)
539 count++; /* no trailing newline */
540 return count;
541 }
542
543 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
544 {
545 if (!DIFF_FILE_VALID(one)) {
546 mf->ptr = (char *)""; /* does not matter */
547 mf->size = 0;
548 return 0;
549 }
550 else if (diff_populate_filespec(one, 0))
551 return -1;
552
553 mf->ptr = one->data;
554 mf->size = one->size;
555 return 0;
556 }
557
558 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
559 static unsigned long diff_filespec_size(struct diff_filespec *one)
560 {
561 if (!DIFF_FILE_VALID(one))
562 return 0;
563 diff_populate_filespec(one, CHECK_SIZE_ONLY);
564 return one->size;
565 }
566
567 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
568 {
569 char *ptr = mf->ptr;
570 long size = mf->size;
571 int cnt = 0;
572
573 if (!size)
574 return cnt;
575 ptr += size - 1; /* pointing at the very end */
576 if (*ptr != '\n')
577 ; /* incomplete line */
578 else
579 ptr--; /* skip the last LF */
580 while (mf->ptr < ptr) {
581 char *prev_eol;
582 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
583 if (*prev_eol == '\n')
584 break;
585 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
586 break;
587 cnt++;
588 ptr = prev_eol - 1;
589 }
590 return cnt;
591 }
592
593 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
594 struct emit_callback *ecbdata)
595 {
596 int l1, l2, at;
597 unsigned ws_rule = ecbdata->ws_rule;
598 l1 = count_trailing_blank(mf1, ws_rule);
599 l2 = count_trailing_blank(mf2, ws_rule);
600 if (l2 <= l1) {
601 ecbdata->blank_at_eof_in_preimage = 0;
602 ecbdata->blank_at_eof_in_postimage = 0;
603 return;
604 }
605 at = count_lines(mf1->ptr, mf1->size);
606 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
607
608 at = count_lines(mf2->ptr, mf2->size);
609 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
610 }
611
612 static void emit_line_0(struct diff_options *o,
613 const char *set, unsigned reverse, const char *reset,
614 int first, const char *line, int len)
615 {
616 int has_trailing_newline, has_trailing_carriage_return;
617 int nofirst;
618 FILE *file = o->file;
619
620 if (first)
621 fputs(diff_line_prefix(o), file);
622 else if (!len)
623 return;
624
625 if (len == 0) {
626 has_trailing_newline = (first == '\n');
627 has_trailing_carriage_return = (!has_trailing_newline &&
628 (first == '\r'));
629 nofirst = has_trailing_newline || has_trailing_carriage_return;
630 } else {
631 has_trailing_newline = (len > 0 && line[len-1] == '\n');
632 if (has_trailing_newline)
633 len--;
634 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
635 if (has_trailing_carriage_return)
636 len--;
637 nofirst = 0;
638 }
639
640 if (len || !nofirst) {
641 if (reverse && want_color(o->use_color))
642 fputs(GIT_COLOR_REVERSE, file);
643 fputs(set, file);
644 if (first && !nofirst)
645 fputc(first, file);
646 fwrite(line, len, 1, file);
647 fputs(reset, file);
648 }
649 if (has_trailing_carriage_return)
650 fputc('\r', file);
651 if (has_trailing_newline)
652 fputc('\n', file);
653 }
654
655 static void emit_line(struct diff_options *o, const char *set, const char *reset,
656 const char *line, int len)
657 {
658 emit_line_0(o, set, 0, reset, line[0], line+1, len-1);
659 }
660
661 enum diff_symbol {
662 DIFF_SYMBOL_BINARY_DIFF_HEADER,
663 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
664 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
665 DIFF_SYMBOL_BINARY_DIFF_BODY,
666 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
667 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
668 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
669 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
670 DIFF_SYMBOL_STATS_LINE,
671 DIFF_SYMBOL_WORD_DIFF,
672 DIFF_SYMBOL_STAT_SEP,
673 DIFF_SYMBOL_SUMMARY,
674 DIFF_SYMBOL_SUBMODULE_ADD,
675 DIFF_SYMBOL_SUBMODULE_DEL,
676 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
677 DIFF_SYMBOL_SUBMODULE_MODIFIED,
678 DIFF_SYMBOL_SUBMODULE_HEADER,
679 DIFF_SYMBOL_SUBMODULE_ERROR,
680 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
681 DIFF_SYMBOL_REWRITE_DIFF,
682 DIFF_SYMBOL_BINARY_FILES,
683 DIFF_SYMBOL_HEADER,
684 DIFF_SYMBOL_FILEPAIR_PLUS,
685 DIFF_SYMBOL_FILEPAIR_MINUS,
686 DIFF_SYMBOL_WORDS_PORCELAIN,
687 DIFF_SYMBOL_WORDS,
688 DIFF_SYMBOL_CONTEXT,
689 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
690 DIFF_SYMBOL_PLUS,
691 DIFF_SYMBOL_MINUS,
692 DIFF_SYMBOL_NO_LF_EOF,
693 DIFF_SYMBOL_CONTEXT_FRAGINFO,
694 DIFF_SYMBOL_CONTEXT_MARKER,
695 DIFF_SYMBOL_SEPARATOR
696 };
697 /*
698 * Flags for content lines:
699 * 0..12 are whitespace rules
700 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
701 * 16 is marking if the line is blank at EOF
702 */
703 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
704 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
705 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
706 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
707 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
708
709 /*
710 * This struct is used when we need to buffer the output of the diff output.
711 *
712 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
713 * into the pre/post image file. This pointer could be a union with the
714 * line pointer. By storing an offset into the file instead of the literal line,
715 * we can decrease the memory footprint for the buffered output. At first we
716 * may want to only have indirection for the content lines, but we could also
717 * enhance the state for emitting prefabricated lines, e.g. the similarity
718 * score line or hunk/file headers would only need to store a number or path
719 * and then the output can be constructed later on depending on state.
720 */
721 struct emitted_diff_symbol {
722 const char *line;
723 int len;
724 int flags;
725 enum diff_symbol s;
726 };
727 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
728
729 struct emitted_diff_symbols {
730 struct emitted_diff_symbol *buf;
731 int nr, alloc;
732 };
733 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
734
735 static void append_emitted_diff_symbol(struct diff_options *o,
736 struct emitted_diff_symbol *e)
737 {
738 struct emitted_diff_symbol *f;
739
740 ALLOC_GROW(o->emitted_symbols->buf,
741 o->emitted_symbols->nr + 1,
742 o->emitted_symbols->alloc);
743 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
744
745 memcpy(f, e, sizeof(struct emitted_diff_symbol));
746 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
747 }
748
749 struct moved_entry {
750 struct hashmap_entry ent;
751 const struct emitted_diff_symbol *es;
752 struct moved_entry *next_line;
753 struct ws_delta *wsd;
754 };
755
756 /**
757 * The struct ws_delta holds white space differences between moved lines, i.e.
758 * between '+' and '-' lines that have been detected to be a move.
759 * The string contains the difference in leading white spaces, before the
760 * rest of the line is compared using the white space config for move
761 * coloring. The current_longer indicates if the first string in the
762 * comparision is longer than the second.
763 */
764 struct ws_delta {
765 char *string;
766 unsigned int current_longer : 1;
767 };
768 #define WS_DELTA_INIT { NULL, 0 }
769
770 static int compute_ws_delta(const struct emitted_diff_symbol *a,
771 const struct emitted_diff_symbol *b,
772 struct ws_delta *out)
773 {
774 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
775 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
776 int d = longer->len - shorter->len;
777
778 out->string = xmemdupz(longer->line, d);
779 out->current_longer = (a == longer);
780
781 return !strncmp(longer->line + d, shorter->line, shorter->len);
782 }
783
784 static int cmp_in_block_with_wsd(const struct diff_options *o,
785 const struct moved_entry *cur,
786 const struct moved_entry *match,
787 struct moved_entry *pmb,
788 int n)
789 {
790 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
791 int al = cur->es->len, cl = l->len;
792 const char *a = cur->es->line,
793 *b = match->es->line,
794 *c = l->line;
795
796 int wslen;
797
798 /*
799 * We need to check if 'cur' is equal to 'match'.
800 * As those are from the same (+/-) side, we do not need to adjust for
801 * indent changes. However these were found using fuzzy matching
802 * so we do have to check if they are equal.
803 */
804 if (strcmp(a, b))
805 return 1;
806
807 if (!pmb->wsd)
808 /*
809 * No white space delta was carried forward? This can happen
810 * when we exit early in this function and do not carry
811 * forward ws.
812 */
813 return 1;
814
815 /*
816 * The indent changes of the block are known and carried forward in
817 * pmb->wsd; however we need to check if the indent changes of the
818 * current line are still the same as before.
819 *
820 * To do so we need to compare 'l' to 'cur', adjusting the
821 * one of them for the white spaces, depending which was longer.
822 */
823
824 wslen = strlen(pmb->wsd->string);
825 if (pmb->wsd->current_longer) {
826 c += wslen;
827 cl -= wslen;
828 } else {
829 a += wslen;
830 al -= wslen;
831 }
832
833 if (strcmp(a, c))
834 return 1;
835
836 return 0;
837 }
838
839 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
840 const void *entry,
841 const void *entry_or_key,
842 const void *keydata)
843 {
844 const struct diff_options *diffopt = hashmap_cmp_fn_data;
845 const struct moved_entry *a = entry;
846 const struct moved_entry *b = entry_or_key;
847 unsigned flags = diffopt->color_moved_ws_handling
848 & XDF_WHITESPACE_FLAGS;
849
850 if (diffopt->color_moved_ws_handling &
851 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
852 /*
853 * As there is not specific white space config given,
854 * we'd need to check for a new block, so ignore all
855 * white space. The setup of the white space
856 * configuration for the next block is done else where
857 */
858 flags |= XDF_IGNORE_WHITESPACE;
859
860 return !xdiff_compare_lines(a->es->line, a->es->len,
861 b->es->line, b->es->len,
862 flags);
863 }
864
865 static struct moved_entry *prepare_entry(struct diff_options *o,
866 int line_no)
867 {
868 struct moved_entry *ret = xmalloc(sizeof(*ret));
869 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
870 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
871
872 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
873 ret->es = l;
874 ret->next_line = NULL;
875 ret->wsd = NULL;
876
877 return ret;
878 }
879
880 static void add_lines_to_move_detection(struct diff_options *o,
881 struct hashmap *add_lines,
882 struct hashmap *del_lines)
883 {
884 struct moved_entry *prev_line = NULL;
885
886 int n;
887 for (n = 0; n < o->emitted_symbols->nr; n++) {
888 struct hashmap *hm;
889 struct moved_entry *key;
890
891 switch (o->emitted_symbols->buf[n].s) {
892 case DIFF_SYMBOL_PLUS:
893 hm = add_lines;
894 break;
895 case DIFF_SYMBOL_MINUS:
896 hm = del_lines;
897 break;
898 default:
899 prev_line = NULL;
900 continue;
901 }
902
903 key = prepare_entry(o, n);
904 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
905 prev_line->next_line = key;
906
907 hashmap_add(hm, key);
908 prev_line = key;
909 }
910 }
911
912 static void pmb_advance_or_null(struct diff_options *o,
913 struct moved_entry *match,
914 struct hashmap *hm,
915 struct moved_entry **pmb,
916 int pmb_nr)
917 {
918 int i;
919 for (i = 0; i < pmb_nr; i++) {
920 struct moved_entry *prev = pmb[i];
921 struct moved_entry *cur = (prev && prev->next_line) ?
922 prev->next_line : NULL;
923 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
924 pmb[i] = cur;
925 } else {
926 pmb[i] = NULL;
927 }
928 }
929 }
930
931 static void pmb_advance_or_null_multi_match(struct diff_options *o,
932 struct moved_entry *match,
933 struct hashmap *hm,
934 struct moved_entry **pmb,
935 int pmb_nr, int n)
936 {
937 int i;
938 char *got_match = xcalloc(1, pmb_nr);
939
940 for (; match; match = hashmap_get_next(hm, match)) {
941 for (i = 0; i < pmb_nr; i++) {
942 struct moved_entry *prev = pmb[i];
943 struct moved_entry *cur = (prev && prev->next_line) ?
944 prev->next_line : NULL;
945 if (!cur)
946 continue;
947 if (!cmp_in_block_with_wsd(o, cur, match, pmb[i], n))
948 got_match[i] |= 1;
949 }
950 }
951
952 for (i = 0; i < pmb_nr; i++) {
953 if (got_match[i]) {
954 /* Carry the white space delta forward */
955 pmb[i]->next_line->wsd = pmb[i]->wsd;
956 pmb[i] = pmb[i]->next_line;
957 } else
958 pmb[i] = NULL;
959 }
960 }
961
962 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
963 int pmb_nr)
964 {
965 int lp, rp;
966
967 /* Shrink the set of potential block to the remaining running */
968 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
969 while (lp < pmb_nr && pmb[lp])
970 lp++;
971 /* lp points at the first NULL now */
972
973 while (rp > -1 && !pmb[rp])
974 rp--;
975 /* rp points at the last non-NULL */
976
977 if (lp < pmb_nr && rp > -1 && lp < rp) {
978 pmb[lp] = pmb[rp];
979 if (pmb[rp]->wsd) {
980 free(pmb[rp]->wsd->string);
981 FREE_AND_NULL(pmb[rp]->wsd);
982 }
983 pmb[rp] = NULL;
984 rp--;
985 lp++;
986 }
987 }
988
989 /* Remember the number of running sets */
990 return rp + 1;
991 }
992
993 /*
994 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
995 *
996 * Otherwise, if the last block has fewer alphanumeric characters than
997 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
998 * that block.
999 *
1000 * The last block consists of the (n - block_length)'th line up to but not
1001 * including the nth line.
1002 *
1003 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1004 * Think of a way to unify them.
1005 */
1006 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1007 {
1008 int i, alnum_count = 0;
1009 if (o->color_moved == COLOR_MOVED_PLAIN)
1010 return;
1011 for (i = 1; i < block_length + 1; i++) {
1012 const char *c = o->emitted_symbols->buf[n - i].line;
1013 for (; *c; c++) {
1014 if (!isalnum(*c))
1015 continue;
1016 alnum_count++;
1017 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1018 return;
1019 }
1020 }
1021 for (i = 1; i < block_length + 1; i++)
1022 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1023 }
1024
1025 /* Find blocks of moved code, delegate actual coloring decision to helper */
1026 static void mark_color_as_moved(struct diff_options *o,
1027 struct hashmap *add_lines,
1028 struct hashmap *del_lines)
1029 {
1030 struct moved_entry **pmb = NULL; /* potentially moved blocks */
1031 int pmb_nr = 0, pmb_alloc = 0;
1032 int n, flipped_block = 1, block_length = 0;
1033
1034
1035 for (n = 0; n < o->emitted_symbols->nr; n++) {
1036 struct hashmap *hm = NULL;
1037 struct moved_entry *key;
1038 struct moved_entry *match = NULL;
1039 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1040
1041 switch (l->s) {
1042 case DIFF_SYMBOL_PLUS:
1043 hm = del_lines;
1044 key = prepare_entry(o, n);
1045 match = hashmap_get(hm, key, NULL);
1046 free(key);
1047 break;
1048 case DIFF_SYMBOL_MINUS:
1049 hm = add_lines;
1050 key = prepare_entry(o, n);
1051 match = hashmap_get(hm, key, NULL);
1052 free(key);
1053 break;
1054 default:
1055 flipped_block = 1;
1056 }
1057
1058 if (!match) {
1059 adjust_last_block(o, n, block_length);
1060 pmb_nr = 0;
1061 block_length = 0;
1062 continue;
1063 }
1064
1065 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1066
1067 if (o->color_moved == COLOR_MOVED_PLAIN)
1068 continue;
1069
1070 if (o->color_moved_ws_handling &
1071 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1072 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1073 else
1074 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1075
1076 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1077
1078 if (pmb_nr == 0) {
1079 /*
1080 * The current line is the start of a new block.
1081 * Setup the set of potential blocks.
1082 */
1083 for (; match; match = hashmap_get_next(hm, match)) {
1084 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1085 if (o->color_moved_ws_handling &
1086 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1087 struct ws_delta *wsd = xmalloc(sizeof(*match->wsd));
1088 if (compute_ws_delta(l, match->es, wsd)) {
1089 match->wsd = wsd;
1090 pmb[pmb_nr++] = match;
1091 } else
1092 free(wsd);
1093 } else {
1094 pmb[pmb_nr++] = match;
1095 }
1096 }
1097
1098 flipped_block = (flipped_block + 1) % 2;
1099
1100 adjust_last_block(o, n, block_length);
1101 block_length = 0;
1102 }
1103
1104 block_length++;
1105
1106 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1107 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1108 }
1109 adjust_last_block(o, n, block_length);
1110
1111 free(pmb);
1112 }
1113
1114 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1115 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1116 static void dim_moved_lines(struct diff_options *o)
1117 {
1118 int n;
1119 for (n = 0; n < o->emitted_symbols->nr; n++) {
1120 struct emitted_diff_symbol *prev = (n != 0) ?
1121 &o->emitted_symbols->buf[n - 1] : NULL;
1122 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1123 struct emitted_diff_symbol *next =
1124 (n < o->emitted_symbols->nr - 1) ?
1125 &o->emitted_symbols->buf[n + 1] : NULL;
1126
1127 /* Not a plus or minus line? */
1128 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1129 continue;
1130
1131 /* Not a moved line? */
1132 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1133 continue;
1134
1135 /*
1136 * If prev or next are not a plus or minus line,
1137 * pretend they don't exist
1138 */
1139 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1140 prev->s != DIFF_SYMBOL_MINUS)
1141 prev = NULL;
1142 if (next && next->s != DIFF_SYMBOL_PLUS &&
1143 next->s != DIFF_SYMBOL_MINUS)
1144 next = NULL;
1145
1146 /* Inside a block? */
1147 if ((prev &&
1148 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1149 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1150 (next &&
1151 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1152 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1153 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1154 continue;
1155 }
1156
1157 /* Check if we are at an interesting bound: */
1158 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1159 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1160 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1161 continue;
1162 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1163 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1164 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1165 continue;
1166
1167 /*
1168 * The boundary to prev and next are not interesting,
1169 * so this line is not interesting as a whole
1170 */
1171 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1172 }
1173 }
1174
1175 static void emit_line_ws_markup(struct diff_options *o,
1176 const char *set, const char *reset,
1177 const char *line, int len,
1178 const char *set_sign, char sign,
1179 unsigned ws_rule, int blank_at_eof)
1180 {
1181 const char *ws = NULL;
1182
1183 if (o->ws_error_highlight & ws_rule) {
1184 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1185 if (!*ws)
1186 ws = NULL;
1187 }
1188
1189 if (!ws && !set_sign)
1190 emit_line_0(o, set, 0, reset, sign, line, len);
1191 else if (!ws) {
1192 /* Emit just the prefix, then the rest. */
1193 emit_line_0(o, set_sign ? set_sign : set, !!set_sign, reset,
1194 sign, "", 0);
1195 emit_line_0(o, set, 0, reset, 0, line, len);
1196 } else if (blank_at_eof)
1197 /* Blank line at EOF - paint '+' as well */
1198 emit_line_0(o, ws, 0, reset, sign, line, len);
1199 else {
1200 /* Emit just the prefix, then the rest. */
1201 emit_line_0(o, set_sign ? set_sign : set, !!set_sign, reset,
1202 sign, "", 0);
1203 ws_check_emit(line, len, ws_rule,
1204 o->file, set, reset, ws);
1205 }
1206 }
1207
1208 static void emit_diff_symbol_from_struct(struct diff_options *o,
1209 struct emitted_diff_symbol *eds)
1210 {
1211 static const char *nneof = " No newline at end of file\n";
1212 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1213 struct strbuf sb = STRBUF_INIT;
1214
1215 enum diff_symbol s = eds->s;
1216 const char *line = eds->line;
1217 int len = eds->len;
1218 unsigned flags = eds->flags;
1219
1220 switch (s) {
1221 case DIFF_SYMBOL_NO_LF_EOF:
1222 context = diff_get_color_opt(o, DIFF_CONTEXT);
1223 reset = diff_get_color_opt(o, DIFF_RESET);
1224 putc('\n', o->file);
1225 emit_line_0(o, context, 0, reset, '\\',
1226 nneof, strlen(nneof));
1227 break;
1228 case DIFF_SYMBOL_SUBMODULE_HEADER:
1229 case DIFF_SYMBOL_SUBMODULE_ERROR:
1230 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1231 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1232 case DIFF_SYMBOL_SUMMARY:
1233 case DIFF_SYMBOL_STATS_LINE:
1234 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1235 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1236 emit_line(o, "", "", line, len);
1237 break;
1238 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1239 case DIFF_SYMBOL_CONTEXT_MARKER:
1240 context = diff_get_color_opt(o, DIFF_CONTEXT);
1241 reset = diff_get_color_opt(o, DIFF_RESET);
1242 emit_line(o, context, reset, line, len);
1243 break;
1244 case DIFF_SYMBOL_SEPARATOR:
1245 fprintf(o->file, "%s%c",
1246 diff_line_prefix(o),
1247 o->line_termination);
1248 break;
1249 case DIFF_SYMBOL_CONTEXT:
1250 set = diff_get_color_opt(o, DIFF_CONTEXT);
1251 reset = diff_get_color_opt(o, DIFF_RESET);
1252 set_sign = NULL;
1253 if (o->flags.dual_color_diffed_diffs) {
1254 char c = !len ? 0 : line[0];
1255
1256 if (c == '+')
1257 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1258 else if (c == '@')
1259 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1260 else if (c == '-')
1261 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1262 }
1263 emit_line_ws_markup(o, set, reset, line, len, set_sign, ' ',
1264 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1265 break;
1266 case DIFF_SYMBOL_PLUS:
1267 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1268 DIFF_SYMBOL_MOVED_LINE_ALT |
1269 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1270 case DIFF_SYMBOL_MOVED_LINE |
1271 DIFF_SYMBOL_MOVED_LINE_ALT |
1272 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1273 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1274 break;
1275 case DIFF_SYMBOL_MOVED_LINE |
1276 DIFF_SYMBOL_MOVED_LINE_ALT:
1277 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1278 break;
1279 case DIFF_SYMBOL_MOVED_LINE |
1280 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1281 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1282 break;
1283 case DIFF_SYMBOL_MOVED_LINE:
1284 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1285 break;
1286 default:
1287 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1288 }
1289 reset = diff_get_color_opt(o, DIFF_RESET);
1290 if (!o->flags.dual_color_diffed_diffs)
1291 set_sign = NULL;
1292 else {
1293 char c = !len ? 0 : line[0];
1294
1295 set_sign = set;
1296 if (c == '-')
1297 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1298 else if (c == '@')
1299 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1300 else if (c != '+')
1301 set = diff_get_color_opt(o, DIFF_CONTEXT);
1302 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1303 }
1304 emit_line_ws_markup(o, set, reset, line, len, set_sign, '+',
1305 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1306 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1307 break;
1308 case DIFF_SYMBOL_MINUS:
1309 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1310 DIFF_SYMBOL_MOVED_LINE_ALT |
1311 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1312 case DIFF_SYMBOL_MOVED_LINE |
1313 DIFF_SYMBOL_MOVED_LINE_ALT |
1314 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1315 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1316 break;
1317 case DIFF_SYMBOL_MOVED_LINE |
1318 DIFF_SYMBOL_MOVED_LINE_ALT:
1319 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1320 break;
1321 case DIFF_SYMBOL_MOVED_LINE |
1322 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1323 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1324 break;
1325 case DIFF_SYMBOL_MOVED_LINE:
1326 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1327 break;
1328 default:
1329 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1330 }
1331 reset = diff_get_color_opt(o, DIFF_RESET);
1332 if (!o->flags.dual_color_diffed_diffs)
1333 set_sign = NULL;
1334 else {
1335 char c = !len ? 0 : line[0];
1336
1337 set_sign = set;
1338 if (c == '+')
1339 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1340 else if (c == '@')
1341 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1342 else if (c != '-')
1343 set = diff_get_color_opt(o, DIFF_CONTEXT);
1344 }
1345 emit_line_ws_markup(o, set, reset, line, len, set_sign, '-',
1346 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1347 break;
1348 case DIFF_SYMBOL_WORDS_PORCELAIN:
1349 context = diff_get_color_opt(o, DIFF_CONTEXT);
1350 reset = diff_get_color_opt(o, DIFF_RESET);
1351 emit_line(o, context, reset, line, len);
1352 fputs("~\n", o->file);
1353 break;
1354 case DIFF_SYMBOL_WORDS:
1355 context = diff_get_color_opt(o, DIFF_CONTEXT);
1356 reset = diff_get_color_opt(o, DIFF_RESET);
1357 /*
1358 * Skip the prefix character, if any. With
1359 * diff_suppress_blank_empty, there may be
1360 * none.
1361 */
1362 if (line[0] != '\n') {
1363 line++;
1364 len--;
1365 }
1366 emit_line(o, context, reset, line, len);
1367 break;
1368 case DIFF_SYMBOL_FILEPAIR_PLUS:
1369 meta = diff_get_color_opt(o, DIFF_METAINFO);
1370 reset = diff_get_color_opt(o, DIFF_RESET);
1371 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1372 line, reset,
1373 strchr(line, ' ') ? "\t" : "");
1374 break;
1375 case DIFF_SYMBOL_FILEPAIR_MINUS:
1376 meta = diff_get_color_opt(o, DIFF_METAINFO);
1377 reset = diff_get_color_opt(o, DIFF_RESET);
1378 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1379 line, reset,
1380 strchr(line, ' ') ? "\t" : "");
1381 break;
1382 case DIFF_SYMBOL_BINARY_FILES:
1383 case DIFF_SYMBOL_HEADER:
1384 fprintf(o->file, "%s", line);
1385 break;
1386 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1387 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1388 break;
1389 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1390 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1391 break;
1392 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1393 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1394 break;
1395 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1396 fputs(diff_line_prefix(o), o->file);
1397 fputc('\n', o->file);
1398 break;
1399 case DIFF_SYMBOL_REWRITE_DIFF:
1400 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1401 reset = diff_get_color_opt(o, DIFF_RESET);
1402 emit_line(o, fraginfo, reset, line, len);
1403 break;
1404 case DIFF_SYMBOL_SUBMODULE_ADD:
1405 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1406 reset = diff_get_color_opt(o, DIFF_RESET);
1407 emit_line(o, set, reset, line, len);
1408 break;
1409 case DIFF_SYMBOL_SUBMODULE_DEL:
1410 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1411 reset = diff_get_color_opt(o, DIFF_RESET);
1412 emit_line(o, set, reset, line, len);
1413 break;
1414 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1415 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1416 diff_line_prefix(o), line);
1417 break;
1418 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1419 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1420 diff_line_prefix(o), line);
1421 break;
1422 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1423 emit_line(o, "", "", " 0 files changed\n",
1424 strlen(" 0 files changed\n"));
1425 break;
1426 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1427 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1428 break;
1429 case DIFF_SYMBOL_WORD_DIFF:
1430 fprintf(o->file, "%.*s", len, line);
1431 break;
1432 case DIFF_SYMBOL_STAT_SEP:
1433 fputs(o->stat_sep, o->file);
1434 break;
1435 default:
1436 BUG("unknown diff symbol");
1437 }
1438 strbuf_release(&sb);
1439 }
1440
1441 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1442 const char *line, int len, unsigned flags)
1443 {
1444 struct emitted_diff_symbol e = {line, len, flags, s};
1445
1446 if (o->emitted_symbols)
1447 append_emitted_diff_symbol(o, &e);
1448 else
1449 emit_diff_symbol_from_struct(o, &e);
1450 }
1451
1452 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1453 {
1454 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1455 }
1456
1457 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1458 {
1459 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1460 }
1461
1462 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1463 {
1464 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1465 path, strlen(path), 0);
1466 }
1467
1468 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1469 {
1470 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1471 path, strlen(path), 0);
1472 }
1473
1474 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1475 {
1476 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1477 header, strlen(header), 0);
1478 }
1479
1480 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1481 {
1482 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1483 }
1484
1485 void diff_emit_submodule_pipethrough(struct diff_options *o,
1486 const char *line, int len)
1487 {
1488 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1489 }
1490
1491 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1492 {
1493 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1494 ecbdata->blank_at_eof_in_preimage &&
1495 ecbdata->blank_at_eof_in_postimage &&
1496 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1497 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1498 return 0;
1499 return ws_blank_line(line, len, ecbdata->ws_rule);
1500 }
1501
1502 static void emit_add_line(const char *reset,
1503 struct emit_callback *ecbdata,
1504 const char *line, int len)
1505 {
1506 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1507 if (new_blank_line_at_eof(ecbdata, line, len))
1508 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1509
1510 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1511 }
1512
1513 static void emit_del_line(const char *reset,
1514 struct emit_callback *ecbdata,
1515 const char *line, int len)
1516 {
1517 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1518 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1519 }
1520
1521 static void emit_context_line(const char *reset,
1522 struct emit_callback *ecbdata,
1523 const char *line, int len)
1524 {
1525 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1526 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1527 }
1528
1529 static void emit_hunk_header(struct emit_callback *ecbdata,
1530 const char *line, int len)
1531 {
1532 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1533 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1534 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1535 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1536 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1537 static const char atat[2] = { '@', '@' };
1538 const char *cp, *ep;
1539 struct strbuf msgbuf = STRBUF_INIT;
1540 int org_len = len;
1541 int i = 1;
1542
1543 /*
1544 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1545 * it always is at least 10 bytes long.
1546 */
1547 if (len < 10 ||
1548 memcmp(line, atat, 2) ||
1549 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1550 emit_diff_symbol(ecbdata->opt,
1551 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1552 return;
1553 }
1554 ep += 2; /* skip over @@ */
1555
1556 /* The hunk header in fraginfo color */
1557 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1558 strbuf_addstr(&msgbuf, reverse);
1559 strbuf_addstr(&msgbuf, frag);
1560 strbuf_add(&msgbuf, line, ep - line);
1561 strbuf_addstr(&msgbuf, reset);
1562
1563 /*
1564 * trailing "\r\n"
1565 */
1566 for ( ; i < 3; i++)
1567 if (line[len - i] == '\r' || line[len - i] == '\n')
1568 len--;
1569
1570 /* blank before the func header */
1571 for (cp = ep; ep - line < len; ep++)
1572 if (*ep != ' ' && *ep != '\t')
1573 break;
1574 if (ep != cp) {
1575 strbuf_addstr(&msgbuf, context);
1576 strbuf_add(&msgbuf, cp, ep - cp);
1577 strbuf_addstr(&msgbuf, reset);
1578 }
1579
1580 if (ep < line + len) {
1581 strbuf_addstr(&msgbuf, func);
1582 strbuf_add(&msgbuf, ep, line + len - ep);
1583 strbuf_addstr(&msgbuf, reset);
1584 }
1585
1586 strbuf_add(&msgbuf, line + len, org_len - len);
1587 strbuf_complete_line(&msgbuf);
1588 emit_diff_symbol(ecbdata->opt,
1589 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1590 strbuf_release(&msgbuf);
1591 }
1592
1593 static struct diff_tempfile *claim_diff_tempfile(void) {
1594 int i;
1595 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1596 if (!diff_temp[i].name)
1597 return diff_temp + i;
1598 BUG("diff is failing to clean up its tempfiles");
1599 }
1600
1601 static void remove_tempfile(void)
1602 {
1603 int i;
1604 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1605 if (is_tempfile_active(diff_temp[i].tempfile))
1606 delete_tempfile(&diff_temp[i].tempfile);
1607 diff_temp[i].name = NULL;
1608 }
1609 }
1610
1611 static void add_line_count(struct strbuf *out, int count)
1612 {
1613 switch (count) {
1614 case 0:
1615 strbuf_addstr(out, "0,0");
1616 break;
1617 case 1:
1618 strbuf_addstr(out, "1");
1619 break;
1620 default:
1621 strbuf_addf(out, "1,%d", count);
1622 break;
1623 }
1624 }
1625
1626 static void emit_rewrite_lines(struct emit_callback *ecb,
1627 int prefix, const char *data, int size)
1628 {
1629 const char *endp = NULL;
1630 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1631
1632 while (0 < size) {
1633 int len;
1634
1635 endp = memchr(data, '\n', size);
1636 len = endp ? (endp - data + 1) : size;
1637 if (prefix != '+') {
1638 ecb->lno_in_preimage++;
1639 emit_del_line(reset, ecb, data, len);
1640 } else {
1641 ecb->lno_in_postimage++;
1642 emit_add_line(reset, ecb, data, len);
1643 }
1644 size -= len;
1645 data += len;
1646 }
1647 if (!endp)
1648 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1649 }
1650
1651 static void emit_rewrite_diff(const char *name_a,
1652 const char *name_b,
1653 struct diff_filespec *one,
1654 struct diff_filespec *two,
1655 struct userdiff_driver *textconv_one,
1656 struct userdiff_driver *textconv_two,
1657 struct diff_options *o)
1658 {
1659 int lc_a, lc_b;
1660 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1661 const char *a_prefix, *b_prefix;
1662 char *data_one, *data_two;
1663 size_t size_one, size_two;
1664 struct emit_callback ecbdata;
1665 struct strbuf out = STRBUF_INIT;
1666
1667 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1668 a_prefix = o->b_prefix;
1669 b_prefix = o->a_prefix;
1670 } else {
1671 a_prefix = o->a_prefix;
1672 b_prefix = o->b_prefix;
1673 }
1674
1675 name_a += (*name_a == '/');
1676 name_b += (*name_b == '/');
1677
1678 strbuf_reset(&a_name);
1679 strbuf_reset(&b_name);
1680 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1681 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1682
1683 size_one = fill_textconv(textconv_one, one, &data_one);
1684 size_two = fill_textconv(textconv_two, two, &data_two);
1685
1686 memset(&ecbdata, 0, sizeof(ecbdata));
1687 ecbdata.color_diff = want_color(o->use_color);
1688 ecbdata.ws_rule = whitespace_rule(name_b);
1689 ecbdata.opt = o;
1690 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1691 mmfile_t mf1, mf2;
1692 mf1.ptr = (char *)data_one;
1693 mf2.ptr = (char *)data_two;
1694 mf1.size = size_one;
1695 mf2.size = size_two;
1696 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1697 }
1698 ecbdata.lno_in_preimage = 1;
1699 ecbdata.lno_in_postimage = 1;
1700
1701 lc_a = count_lines(data_one, size_one);
1702 lc_b = count_lines(data_two, size_two);
1703
1704 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1705 a_name.buf, a_name.len, 0);
1706 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1707 b_name.buf, b_name.len, 0);
1708
1709 strbuf_addstr(&out, "@@ -");
1710 if (!o->irreversible_delete)
1711 add_line_count(&out, lc_a);
1712 else
1713 strbuf_addstr(&out, "?,?");
1714 strbuf_addstr(&out, " +");
1715 add_line_count(&out, lc_b);
1716 strbuf_addstr(&out, " @@\n");
1717 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1718 strbuf_release(&out);
1719
1720 if (lc_a && !o->irreversible_delete)
1721 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1722 if (lc_b)
1723 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1724 if (textconv_one)
1725 free((char *)data_one);
1726 if (textconv_two)
1727 free((char *)data_two);
1728 }
1729
1730 struct diff_words_buffer {
1731 mmfile_t text;
1732 unsigned long alloc;
1733 struct diff_words_orig {
1734 const char *begin, *end;
1735 } *orig;
1736 int orig_nr, orig_alloc;
1737 };
1738
1739 static void diff_words_append(char *line, unsigned long len,
1740 struct diff_words_buffer *buffer)
1741 {
1742 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1743 line++;
1744 len--;
1745 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1746 buffer->text.size += len;
1747 buffer->text.ptr[buffer->text.size] = '\0';
1748 }
1749
1750 struct diff_words_style_elem {
1751 const char *prefix;
1752 const char *suffix;
1753 const char *color; /* NULL; filled in by the setup code if
1754 * color is enabled */
1755 };
1756
1757 struct diff_words_style {
1758 enum diff_words_type type;
1759 struct diff_words_style_elem new_word, old_word, ctx;
1760 const char *newline;
1761 };
1762
1763 static struct diff_words_style diff_words_styles[] = {
1764 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1765 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1766 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1767 };
1768
1769 struct diff_words_data {
1770 struct diff_words_buffer minus, plus;
1771 const char *current_plus;
1772 int last_minus;
1773 struct diff_options *opt;
1774 regex_t *word_regex;
1775 enum diff_words_type type;
1776 struct diff_words_style *style;
1777 };
1778
1779 static int fn_out_diff_words_write_helper(struct diff_options *o,
1780 struct diff_words_style_elem *st_el,
1781 const char *newline,
1782 size_t count, const char *buf)
1783 {
1784 int print = 0;
1785 struct strbuf sb = STRBUF_INIT;
1786
1787 while (count) {
1788 char *p = memchr(buf, '\n', count);
1789 if (print)
1790 strbuf_addstr(&sb, diff_line_prefix(o));
1791
1792 if (p != buf) {
1793 const char *reset = st_el->color && *st_el->color ?
1794 GIT_COLOR_RESET : NULL;
1795 if (st_el->color && *st_el->color)
1796 strbuf_addstr(&sb, st_el->color);
1797 strbuf_addstr(&sb, st_el->prefix);
1798 strbuf_add(&sb, buf, p ? p - buf : count);
1799 strbuf_addstr(&sb, st_el->suffix);
1800 if (reset)
1801 strbuf_addstr(&sb, reset);
1802 }
1803 if (!p)
1804 goto out;
1805
1806 strbuf_addstr(&sb, newline);
1807 count -= p + 1 - buf;
1808 buf = p + 1;
1809 print = 1;
1810 if (count) {
1811 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1812 sb.buf, sb.len, 0);
1813 strbuf_reset(&sb);
1814 }
1815 }
1816
1817 out:
1818 if (sb.len)
1819 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1820 sb.buf, sb.len, 0);
1821 strbuf_release(&sb);
1822 return 0;
1823 }
1824
1825 /*
1826 * '--color-words' algorithm can be described as:
1827 *
1828 * 1. collect the minus/plus lines of a diff hunk, divided into
1829 * minus-lines and plus-lines;
1830 *
1831 * 2. break both minus-lines and plus-lines into words and
1832 * place them into two mmfile_t with one word for each line;
1833 *
1834 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1835 *
1836 * And for the common parts of the both file, we output the plus side text.
1837 * diff_words->current_plus is used to trace the current position of the plus file
1838 * which printed. diff_words->last_minus is used to trace the last minus word
1839 * printed.
1840 *
1841 * For '--graph' to work with '--color-words', we need to output the graph prefix
1842 * on each line of color words output. Generally, there are two conditions on
1843 * which we should output the prefix.
1844 *
1845 * 1. diff_words->last_minus == 0 &&
1846 * diff_words->current_plus == diff_words->plus.text.ptr
1847 *
1848 * that is: the plus text must start as a new line, and if there is no minus
1849 * word printed, a graph prefix must be printed.
1850 *
1851 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1852 * *(diff_words->current_plus - 1) == '\n'
1853 *
1854 * that is: a graph prefix must be printed following a '\n'
1855 */
1856 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1857 {
1858 if ((diff_words->last_minus == 0 &&
1859 diff_words->current_plus == diff_words->plus.text.ptr) ||
1860 (diff_words->current_plus > diff_words->plus.text.ptr &&
1861 *(diff_words->current_plus - 1) == '\n')) {
1862 return 1;
1863 } else {
1864 return 0;
1865 }
1866 }
1867
1868 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1869 {
1870 struct diff_words_data *diff_words = priv;
1871 struct diff_words_style *style = diff_words->style;
1872 int minus_first, minus_len, plus_first, plus_len;
1873 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1874 struct diff_options *opt = diff_words->opt;
1875 const char *line_prefix;
1876
1877 if (line[0] != '@' || parse_hunk_header(line, len,
1878 &minus_first, &minus_len, &plus_first, &plus_len))
1879 return;
1880
1881 assert(opt);
1882 line_prefix = diff_line_prefix(opt);
1883
1884 /* POSIX requires that first be decremented by one if len == 0... */
1885 if (minus_len) {
1886 minus_begin = diff_words->minus.orig[minus_first].begin;
1887 minus_end =
1888 diff_words->minus.orig[minus_first + minus_len - 1].end;
1889 } else
1890 minus_begin = minus_end =
1891 diff_words->minus.orig[minus_first].end;
1892
1893 if (plus_len) {
1894 plus_begin = diff_words->plus.orig[plus_first].begin;
1895 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1896 } else
1897 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1898
1899 if (color_words_output_graph_prefix(diff_words)) {
1900 fputs(line_prefix, diff_words->opt->file);
1901 }
1902 if (diff_words->current_plus != plus_begin) {
1903 fn_out_diff_words_write_helper(diff_words->opt,
1904 &style->ctx, style->newline,
1905 plus_begin - diff_words->current_plus,
1906 diff_words->current_plus);
1907 }
1908 if (minus_begin != minus_end) {
1909 fn_out_diff_words_write_helper(diff_words->opt,
1910 &style->old_word, style->newline,
1911 minus_end - minus_begin, minus_begin);
1912 }
1913 if (plus_begin != plus_end) {
1914 fn_out_diff_words_write_helper(diff_words->opt,
1915 &style->new_word, style->newline,
1916 plus_end - plus_begin, plus_begin);
1917 }
1918
1919 diff_words->current_plus = plus_end;
1920 diff_words->last_minus = minus_first;
1921 }
1922
1923 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1924 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1925 int *begin, int *end)
1926 {
1927 if (word_regex && *begin < buffer->size) {
1928 regmatch_t match[1];
1929 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1930 buffer->size - *begin, 1, match, 0)) {
1931 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1932 '\n', match[0].rm_eo - match[0].rm_so);
1933 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1934 *begin += match[0].rm_so;
1935 return *begin >= *end;
1936 }
1937 return -1;
1938 }
1939
1940 /* find the next word */
1941 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1942 (*begin)++;
1943 if (*begin >= buffer->size)
1944 return -1;
1945
1946 /* find the end of the word */
1947 *end = *begin + 1;
1948 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1949 (*end)++;
1950
1951 return 0;
1952 }
1953
1954 /*
1955 * This function splits the words in buffer->text, stores the list with
1956 * newline separator into out, and saves the offsets of the original words
1957 * in buffer->orig.
1958 */
1959 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1960 regex_t *word_regex)
1961 {
1962 int i, j;
1963 long alloc = 0;
1964
1965 out->size = 0;
1966 out->ptr = NULL;
1967
1968 /* fake an empty "0th" word */
1969 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1970 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1971 buffer->orig_nr = 1;
1972
1973 for (i = 0; i < buffer->text.size; i++) {
1974 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1975 return;
1976
1977 /* store original boundaries */
1978 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1979 buffer->orig_alloc);
1980 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1981 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1982 buffer->orig_nr++;
1983
1984 /* store one word */
1985 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1986 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1987 out->ptr[out->size + j - i] = '\n';
1988 out->size += j - i + 1;
1989
1990 i = j - 1;
1991 }
1992 }
1993
1994 /* this executes the word diff on the accumulated buffers */
1995 static void diff_words_show(struct diff_words_data *diff_words)
1996 {
1997 xpparam_t xpp;
1998 xdemitconf_t xecfg;
1999 mmfile_t minus, plus;
2000 struct diff_words_style *style = diff_words->style;
2001
2002 struct diff_options *opt = diff_words->opt;
2003 const char *line_prefix;
2004
2005 assert(opt);
2006 line_prefix = diff_line_prefix(opt);
2007
2008 /* special case: only removal */
2009 if (!diff_words->plus.text.size) {
2010 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2011 line_prefix, strlen(line_prefix), 0);
2012 fn_out_diff_words_write_helper(diff_words->opt,
2013 &style->old_word, style->newline,
2014 diff_words->minus.text.size,
2015 diff_words->minus.text.ptr);
2016 diff_words->minus.text.size = 0;
2017 return;
2018 }
2019
2020 diff_words->current_plus = diff_words->plus.text.ptr;
2021 diff_words->last_minus = 0;
2022
2023 memset(&xpp, 0, sizeof(xpp));
2024 memset(&xecfg, 0, sizeof(xecfg));
2025 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2026 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2027 xpp.flags = 0;
2028 /* as only the hunk header will be parsed, we need a 0-context */
2029 xecfg.ctxlen = 0;
2030 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
2031 &xpp, &xecfg))
2032 die("unable to generate word diff");
2033 free(minus.ptr);
2034 free(plus.ptr);
2035 if (diff_words->current_plus != diff_words->plus.text.ptr +
2036 diff_words->plus.text.size) {
2037 if (color_words_output_graph_prefix(diff_words))
2038 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2039 line_prefix, strlen(line_prefix), 0);
2040 fn_out_diff_words_write_helper(diff_words->opt,
2041 &style->ctx, style->newline,
2042 diff_words->plus.text.ptr + diff_words->plus.text.size
2043 - diff_words->current_plus, diff_words->current_plus);
2044 }
2045 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2046 }
2047
2048 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2049 static void diff_words_flush(struct emit_callback *ecbdata)
2050 {
2051 struct diff_options *wo = ecbdata->diff_words->opt;
2052
2053 if (ecbdata->diff_words->minus.text.size ||
2054 ecbdata->diff_words->plus.text.size)
2055 diff_words_show(ecbdata->diff_words);
2056
2057 if (wo->emitted_symbols) {
2058 struct diff_options *o = ecbdata->opt;
2059 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2060 int i;
2061
2062 /*
2063 * NEEDSWORK:
2064 * Instead of appending each, concat all words to a line?
2065 */
2066 for (i = 0; i < wol->nr; i++)
2067 append_emitted_diff_symbol(o, &wol->buf[i]);
2068
2069 for (i = 0; i < wol->nr; i++)
2070 free((void *)wol->buf[i].line);
2071
2072 wol->nr = 0;
2073 }
2074 }
2075
2076 static void diff_filespec_load_driver(struct diff_filespec *one)
2077 {
2078 /* Use already-loaded driver */
2079 if (one->driver)
2080 return;
2081
2082 if (S_ISREG(one->mode))
2083 one->driver = userdiff_find_by_path(one->path);
2084
2085 /* Fallback to default settings */
2086 if (!one->driver)
2087 one->driver = userdiff_find_by_name("default");
2088 }
2089
2090 static const char *userdiff_word_regex(struct diff_filespec *one)
2091 {
2092 diff_filespec_load_driver(one);
2093 return one->driver->word_regex;
2094 }
2095
2096 static void init_diff_words_data(struct emit_callback *ecbdata,
2097 struct diff_options *orig_opts,
2098 struct diff_filespec *one,
2099 struct diff_filespec *two)
2100 {
2101 int i;
2102 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2103 memcpy(o, orig_opts, sizeof(struct diff_options));
2104
2105 ecbdata->diff_words =
2106 xcalloc(1, sizeof(struct diff_words_data));
2107 ecbdata->diff_words->type = o->word_diff;
2108 ecbdata->diff_words->opt = o;
2109
2110 if (orig_opts->emitted_symbols)
2111 o->emitted_symbols =
2112 xcalloc(1, sizeof(struct emitted_diff_symbols));
2113
2114 if (!o->word_regex)
2115 o->word_regex = userdiff_word_regex(one);
2116 if (!o->word_regex)
2117 o->word_regex = userdiff_word_regex(two);
2118 if (!o->word_regex)
2119 o->word_regex = diff_word_regex_cfg;
2120 if (o->word_regex) {
2121 ecbdata->diff_words->word_regex = (regex_t *)
2122 xmalloc(sizeof(regex_t));
2123 if (regcomp(ecbdata->diff_words->word_regex,
2124 o->word_regex,
2125 REG_EXTENDED | REG_NEWLINE))
2126 die ("Invalid regular expression: %s",
2127 o->word_regex);
2128 }
2129 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2130 if (o->word_diff == diff_words_styles[i].type) {
2131 ecbdata->diff_words->style =
2132 &diff_words_styles[i];
2133 break;
2134 }
2135 }
2136 if (want_color(o->use_color)) {
2137 struct diff_words_style *st = ecbdata->diff_words->style;
2138 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2139 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2140 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2141 }
2142 }
2143
2144 static void free_diff_words_data(struct emit_callback *ecbdata)
2145 {
2146 if (ecbdata->diff_words) {
2147 diff_words_flush(ecbdata);
2148 free (ecbdata->diff_words->opt->emitted_symbols);
2149 free (ecbdata->diff_words->opt);
2150 free (ecbdata->diff_words->minus.text.ptr);
2151 free (ecbdata->diff_words->minus.orig);
2152 free (ecbdata->diff_words->plus.text.ptr);
2153 free (ecbdata->diff_words->plus.orig);
2154 if (ecbdata->diff_words->word_regex) {
2155 regfree(ecbdata->diff_words->word_regex);
2156 free(ecbdata->diff_words->word_regex);
2157 }
2158 FREE_AND_NULL(ecbdata->diff_words);
2159 }
2160 }
2161
2162 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2163 {
2164 if (want_color(diff_use_color))
2165 return diff_colors[ix];
2166 return "";
2167 }
2168
2169 const char *diff_line_prefix(struct diff_options *opt)
2170 {
2171 struct strbuf *msgbuf;
2172 if (!opt->output_prefix)
2173 return "";
2174
2175 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2176 return msgbuf->buf;
2177 }
2178
2179 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2180 {
2181 const char *cp;
2182 unsigned long allot;
2183 size_t l = len;
2184
2185 cp = line;
2186 allot = l;
2187 while (0 < l) {
2188 (void) utf8_width(&cp, &l);
2189 if (!cp)
2190 break; /* truncated in the middle? */
2191 }
2192 return allot - l;
2193 }
2194
2195 static void find_lno(const char *line, struct emit_callback *ecbdata)
2196 {
2197 const char *p;
2198 ecbdata->lno_in_preimage = 0;
2199 ecbdata->lno_in_postimage = 0;
2200 p = strchr(line, '-');
2201 if (!p)
2202 return; /* cannot happen */
2203 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2204 p = strchr(p, '+');
2205 if (!p)
2206 return; /* cannot happen */
2207 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2208 }
2209
2210 static void fn_out_consume(void *priv, char *line, unsigned long len)
2211 {
2212 struct emit_callback *ecbdata = priv;
2213 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2214 struct diff_options *o = ecbdata->opt;
2215
2216 o->found_changes = 1;
2217
2218 if (ecbdata->header) {
2219 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2220 ecbdata->header->buf, ecbdata->header->len, 0);
2221 strbuf_reset(ecbdata->header);
2222 ecbdata->header = NULL;
2223 }
2224
2225 if (ecbdata->label_path[0]) {
2226 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2227 ecbdata->label_path[0],
2228 strlen(ecbdata->label_path[0]), 0);
2229 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2230 ecbdata->label_path[1],
2231 strlen(ecbdata->label_path[1]), 0);
2232 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2233 }
2234
2235 if (diff_suppress_blank_empty
2236 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2237 line[0] = '\n';
2238 len = 1;
2239 }
2240
2241 if (line[0] == '@') {
2242 if (ecbdata->diff_words)
2243 diff_words_flush(ecbdata);
2244 len = sane_truncate_line(ecbdata, line, len);
2245 find_lno(line, ecbdata);
2246 emit_hunk_header(ecbdata, line, len);
2247 return;
2248 }
2249
2250 if (ecbdata->diff_words) {
2251 enum diff_symbol s =
2252 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2253 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2254 if (line[0] == '-') {
2255 diff_words_append(line, len,
2256 &ecbdata->diff_words->minus);
2257 return;
2258 } else if (line[0] == '+') {
2259 diff_words_append(line, len,
2260 &ecbdata->diff_words->plus);
2261 return;
2262 } else if (starts_with(line, "\\ ")) {
2263 /*
2264 * Eat the "no newline at eof" marker as if we
2265 * saw a "+" or "-" line with nothing on it,
2266 * and return without diff_words_flush() to
2267 * defer processing. If this is the end of
2268 * preimage, more "+" lines may come after it.
2269 */
2270 return;
2271 }
2272 diff_words_flush(ecbdata);
2273 emit_diff_symbol(o, s, line, len, 0);
2274 return;
2275 }
2276
2277 switch (line[0]) {
2278 case '+':
2279 ecbdata->lno_in_postimage++;
2280 emit_add_line(reset, ecbdata, line + 1, len - 1);
2281 break;
2282 case '-':
2283 ecbdata->lno_in_preimage++;
2284 emit_del_line(reset, ecbdata, line + 1, len - 1);
2285 break;
2286 case ' ':
2287 ecbdata->lno_in_postimage++;
2288 ecbdata->lno_in_preimage++;
2289 emit_context_line(reset, ecbdata, line + 1, len - 1);
2290 break;
2291 default:
2292 /* incomplete line at the end */
2293 ecbdata->lno_in_preimage++;
2294 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2295 line, len, 0);
2296 break;
2297 }
2298 }
2299
2300 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2301 {
2302 const char *old_name = a;
2303 const char *new_name = b;
2304 int pfx_length, sfx_length;
2305 int pfx_adjust_for_slash;
2306 int len_a = strlen(a);
2307 int len_b = strlen(b);
2308 int a_midlen, b_midlen;
2309 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2310 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2311
2312 if (qlen_a || qlen_b) {
2313 quote_c_style(a, name, NULL, 0);
2314 strbuf_addstr(name, " => ");
2315 quote_c_style(b, name, NULL, 0);
2316 return;
2317 }
2318
2319 /* Find common prefix */
2320 pfx_length = 0;
2321 while (*old_name && *new_name && *old_name == *new_name) {
2322 if (*old_name == '/')
2323 pfx_length = old_name - a + 1;
2324 old_name++;
2325 new_name++;
2326 }
2327
2328 /* Find common suffix */
2329 old_name = a + len_a;
2330 new_name = b + len_b;
2331 sfx_length = 0;
2332 /*
2333 * If there is a common prefix, it must end in a slash. In
2334 * that case we let this loop run 1 into the prefix to see the
2335 * same slash.
2336 *
2337 * If there is no common prefix, we cannot do this as it would
2338 * underrun the input strings.
2339 */
2340 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2341 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2342 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2343 *old_name == *new_name) {
2344 if (*old_name == '/')
2345 sfx_length = len_a - (old_name - a);
2346 old_name--;
2347 new_name--;
2348 }
2349
2350 /*
2351 * pfx{mid-a => mid-b}sfx
2352 * {pfx-a => pfx-b}sfx
2353 * pfx{sfx-a => sfx-b}
2354 * name-a => name-b
2355 */
2356 a_midlen = len_a - pfx_length - sfx_length;
2357 b_midlen = len_b - pfx_length - sfx_length;
2358 if (a_midlen < 0)
2359 a_midlen = 0;
2360 if (b_midlen < 0)
2361 b_midlen = 0;
2362
2363 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2364 if (pfx_length + sfx_length) {
2365 strbuf_add(name, a, pfx_length);
2366 strbuf_addch(name, '{');
2367 }
2368 strbuf_add(name, a + pfx_length, a_midlen);
2369 strbuf_addstr(name, " => ");
2370 strbuf_add(name, b + pfx_length, b_midlen);
2371 if (pfx_length + sfx_length) {
2372 strbuf_addch(name, '}');
2373 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2374 }
2375 }
2376
2377 struct diffstat_t {
2378 int nr;
2379 int alloc;
2380 struct diffstat_file {
2381 char *from_name;
2382 char *name;
2383 char *print_name;
2384 const char *comments;
2385 unsigned is_unmerged:1;
2386 unsigned is_binary:1;
2387 unsigned is_renamed:1;
2388 unsigned is_interesting:1;
2389 uintmax_t added, deleted;
2390 } **files;
2391 };
2392
2393 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2394 const char *name_a,
2395 const char *name_b)
2396 {
2397 struct diffstat_file *x;
2398 x = xcalloc(1, sizeof(*x));
2399 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2400 diffstat->files[diffstat->nr++] = x;
2401 if (name_b) {
2402 x->from_name = xstrdup(name_a);
2403 x->name = xstrdup(name_b);
2404 x->is_renamed = 1;
2405 }
2406 else {
2407 x->from_name = NULL;
2408 x->name = xstrdup(name_a);
2409 }
2410 return x;
2411 }
2412
2413 static void diffstat_consume(void *priv, char *line, unsigned long len)
2414 {
2415 struct diffstat_t *diffstat = priv;
2416 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2417
2418 if (line[0] == '+')
2419 x->added++;
2420 else if (line[0] == '-')
2421 x->deleted++;
2422 }
2423
2424 const char mime_boundary_leader[] = "------------";
2425
2426 static int scale_linear(int it, int width, int max_change)
2427 {
2428 if (!it)
2429 return 0;
2430 /*
2431 * make sure that at least one '-' or '+' is printed if
2432 * there is any change to this path. The easiest way is to
2433 * scale linearly as if the alloted width is one column shorter
2434 * than it is, and then add 1 to the result.
2435 */
2436 return 1 + (it * (width - 1) / max_change);
2437 }
2438
2439 static void show_graph(struct strbuf *out, char ch, int cnt,
2440 const char *set, const char *reset)
2441 {
2442 if (cnt <= 0)
2443 return;
2444 strbuf_addstr(out, set);
2445 strbuf_addchars(out, ch, cnt);
2446 strbuf_addstr(out, reset);
2447 }
2448
2449 static void fill_print_name(struct diffstat_file *file)
2450 {
2451 struct strbuf pname = STRBUF_INIT;
2452
2453 if (file->print_name)
2454 return;
2455
2456 if (file->is_renamed)
2457 pprint_rename(&pname, file->from_name, file->name);
2458 else
2459 quote_c_style(file->name, &pname, NULL, 0);
2460
2461 if (file->comments)
2462 strbuf_addf(&pname, " (%s)", file->comments);
2463
2464 file->print_name = strbuf_detach(&pname, NULL);
2465 }
2466
2467 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2468 int files, int insertions, int deletions)
2469 {
2470 struct strbuf sb = STRBUF_INIT;
2471
2472 if (!files) {
2473 assert(insertions == 0 && deletions == 0);
2474 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2475 NULL, 0, 0);
2476 return;
2477 }
2478
2479 strbuf_addf(&sb,
2480 (files == 1) ? " %d file changed" : " %d files changed",
2481 files);
2482
2483 /*
2484 * For binary diff, the caller may want to print "x files
2485 * changed" with insertions == 0 && deletions == 0.
2486 *
2487 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2488 * is probably less confusing (i.e skip over "2 files changed
2489 * but nothing about added/removed lines? Is this a bug in Git?").
2490 */
2491 if (insertions || deletions == 0) {
2492 strbuf_addf(&sb,
2493 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2494 insertions);
2495 }
2496
2497 if (deletions || insertions == 0) {
2498 strbuf_addf(&sb,
2499 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2500 deletions);
2501 }
2502 strbuf_addch(&sb, '\n');
2503 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2504 sb.buf, sb.len, 0);
2505 strbuf_release(&sb);
2506 }
2507
2508 void print_stat_summary(FILE *fp, int files,
2509 int insertions, int deletions)
2510 {
2511 struct diff_options o;
2512 memset(&o, 0, sizeof(o));
2513 o.file = fp;
2514
2515 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2516 }
2517
2518 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2519 {
2520 int i, len, add, del, adds = 0, dels = 0;
2521 uintmax_t max_change = 0, max_len = 0;
2522 int total_files = data->nr, count;
2523 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2524 const char *reset, *add_c, *del_c;
2525 int extra_shown = 0;
2526 const char *line_prefix = diff_line_prefix(options);
2527 struct strbuf out = STRBUF_INIT;
2528
2529 if (data->nr == 0)
2530 return;
2531
2532 count = options->stat_count ? options->stat_count : data->nr;
2533
2534 reset = diff_get_color_opt(options, DIFF_RESET);
2535 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2536 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2537
2538 /*
2539 * Find the longest filename and max number of changes
2540 */
2541 for (i = 0; (i < count) && (i < data->nr); i++) {
2542 struct diffstat_file *file = data->files[i];
2543 uintmax_t change = file->added + file->deleted;
2544
2545 if (!file->is_interesting && (change == 0)) {
2546 count++; /* not shown == room for one more */
2547 continue;
2548 }
2549 fill_print_name(file);
2550 len = strlen(file->print_name);
2551 if (max_len < len)
2552 max_len = len;
2553
2554 if (file->is_unmerged) {
2555 /* "Unmerged" is 8 characters */
2556 bin_width = bin_width < 8 ? 8 : bin_width;
2557 continue;
2558 }
2559 if (file->is_binary) {
2560 /* "Bin XXX -> YYY bytes" */
2561 int w = 14 + decimal_width(file->added)
2562 + decimal_width(file->deleted);
2563 bin_width = bin_width < w ? w : bin_width;
2564 /* Display change counts aligned with "Bin" */
2565 number_width = 3;
2566 continue;
2567 }
2568
2569 if (max_change < change)
2570 max_change = change;
2571 }
2572 count = i; /* where we can stop scanning in data->files[] */
2573
2574 /*
2575 * We have width = stat_width or term_columns() columns total.
2576 * We want a maximum of min(max_len, stat_name_width) for the name part.
2577 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2578 * We also need 1 for " " and 4 + decimal_width(max_change)
2579 * for " | NNNN " and one the empty column at the end, altogether
2580 * 6 + decimal_width(max_change).
2581 *
2582 * If there's not enough space, we will use the smaller of
2583 * stat_name_width (if set) and 5/8*width for the filename,
2584 * and the rest for constant elements + graph part, but no more
2585 * than stat_graph_width for the graph part.
2586 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2587 * for the standard terminal size).
2588 *
2589 * In other words: stat_width limits the maximum width, and
2590 * stat_name_width fixes the maximum width of the filename,
2591 * and is also used to divide available columns if there
2592 * aren't enough.
2593 *
2594 * Binary files are displayed with "Bin XXX -> YYY bytes"
2595 * instead of the change count and graph. This part is treated
2596 * similarly to the graph part, except that it is not
2597 * "scaled". If total width is too small to accommodate the
2598 * guaranteed minimum width of the filename part and the
2599 * separators and this message, this message will "overflow"
2600 * making the line longer than the maximum width.
2601 */
2602
2603 if (options->stat_width == -1)
2604 width = term_columns() - strlen(line_prefix);
2605 else
2606 width = options->stat_width ? options->stat_width : 80;
2607 number_width = decimal_width(max_change) > number_width ?
2608 decimal_width(max_change) : number_width;
2609
2610 if (options->stat_graph_width == -1)
2611 options->stat_graph_width = diff_stat_graph_width;
2612
2613 /*
2614 * Guarantee 3/8*16==6 for the graph part
2615 * and 5/8*16==10 for the filename part
2616 */
2617 if (width < 16 + 6 + number_width)
2618 width = 16 + 6 + number_width;
2619
2620 /*
2621 * First assign sizes that are wanted, ignoring available width.
2622 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2623 * starting from "XXX" should fit in graph_width.
2624 */
2625 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2626 if (options->stat_graph_width &&
2627 options->stat_graph_width < graph_width)
2628 graph_width = options->stat_graph_width;
2629
2630 name_width = (options->stat_name_width > 0 &&
2631 options->stat_name_width < max_len) ?
2632 options->stat_name_width : max_len;
2633
2634 /*
2635 * Adjust adjustable widths not to exceed maximum width
2636 */
2637 if (name_width + number_width + 6 + graph_width > width) {
2638 if (graph_width > width * 3/8 - number_width - 6) {
2639 graph_width = width * 3/8 - number_width - 6;
2640 if (graph_width < 6)
2641 graph_width = 6;
2642 }
2643
2644 if (options->stat_graph_width &&
2645 graph_width > options->stat_graph_width)
2646 graph_width = options->stat_graph_width;
2647 if (name_width > width - number_width - 6 - graph_width)
2648 name_width = width - number_width - 6 - graph_width;
2649 else
2650 graph_width = width - number_width - 6 - name_width;
2651 }
2652
2653 /*
2654 * From here name_width is the width of the name area,
2655 * and graph_width is the width of the graph area.
2656 * max_change is used to scale graph properly.
2657 */
2658 for (i = 0; i < count; i++) {
2659 const char *prefix = "";
2660 struct diffstat_file *file = data->files[i];
2661 char *name = file->print_name;
2662 uintmax_t added = file->added;
2663 uintmax_t deleted = file->deleted;
2664 int name_len;
2665
2666 if (!file->is_interesting && (added + deleted == 0))
2667 continue;
2668
2669 /*
2670 * "scale" the filename
2671 */
2672 len = name_width;
2673 name_len = strlen(name);
2674 if (name_width < name_len) {
2675 char *slash;
2676 prefix = "...";
2677 len -= 3;
2678 name += name_len - len;
2679 slash = strchr(name, '/');
2680 if (slash)
2681 name = slash;
2682 }
2683
2684 if (file->is_binary) {
2685 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2686 strbuf_addf(&out, " %*s", number_width, "Bin");
2687 if (!added && !deleted) {
2688 strbuf_addch(&out, '\n');
2689 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2690 out.buf, out.len, 0);
2691 strbuf_reset(&out);
2692 continue;
2693 }
2694 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2695 del_c, deleted, reset);
2696 strbuf_addstr(&out, " -> ");
2697 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2698 add_c, added, reset);
2699 strbuf_addstr(&out, " bytes\n");
2700 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2701 out.buf, out.len, 0);
2702 strbuf_reset(&out);
2703 continue;
2704 }
2705 else if (file->is_unmerged) {
2706 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2707 strbuf_addstr(&out, " Unmerged\n");
2708 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2709 out.buf, out.len, 0);
2710 strbuf_reset(&out);
2711 continue;
2712 }
2713
2714 /*
2715 * scale the add/delete
2716 */
2717 add = added;
2718 del = deleted;
2719
2720 if (graph_width <= max_change) {
2721 int total = scale_linear(add + del, graph_width, max_change);
2722 if (total < 2 && add && del)
2723 /* width >= 2 due to the sanity check */
2724 total = 2;
2725 if (add < del) {
2726 add = scale_linear(add, graph_width, max_change);
2727 del = total - add;
2728 } else {
2729 del = scale_linear(del, graph_width, max_change);
2730 add = total - del;
2731 }
2732 }
2733 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2734 strbuf_addf(&out, " %*"PRIuMAX"%s",
2735 number_width, added + deleted,
2736 added + deleted ? " " : "");
2737 show_graph(&out, '+', add, add_c, reset);
2738 show_graph(&out, '-', del, del_c, reset);
2739 strbuf_addch(&out, '\n');
2740 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2741 out.buf, out.len, 0);
2742 strbuf_reset(&out);
2743 }
2744
2745 for (i = 0; i < data->nr; i++) {
2746 struct diffstat_file *file = data->files[i];
2747 uintmax_t added = file->added;
2748 uintmax_t deleted = file->deleted;
2749
2750 if (file->is_unmerged ||
2751 (!file->is_interesting && (added + deleted == 0))) {
2752 total_files--;
2753 continue;
2754 }
2755
2756 if (!file->is_binary) {
2757 adds += added;
2758 dels += deleted;
2759 }
2760 if (i < count)
2761 continue;
2762 if (!extra_shown)
2763 emit_diff_symbol(options,
2764 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2765 NULL, 0, 0);
2766 extra_shown = 1;
2767 }
2768
2769 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2770 strbuf_release(&out);
2771 }
2772
2773 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2774 {
2775 int i, adds = 0, dels = 0, total_files = data->nr;
2776
2777 if (data->nr == 0)
2778 return;
2779
2780 for (i = 0; i < data->nr; i++) {
2781 int added = data->files[i]->added;
2782 int deleted = data->files[i]->deleted;
2783
2784 if (data->files[i]->is_unmerged ||
2785 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2786 total_files--;
2787 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2788 adds += added;
2789 dels += deleted;
2790 }
2791 }
2792 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2793 }
2794
2795 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2796 {
2797 int i;
2798
2799 if (data->nr == 0)
2800 return;
2801
2802 for (i = 0; i < data->nr; i++) {
2803 struct diffstat_file *file = data->files[i];
2804
2805 fprintf(options->file, "%s", diff_line_prefix(options));
2806
2807 if (file->is_binary)
2808 fprintf(options->file, "-\t-\t");
2809 else
2810 fprintf(options->file,
2811 "%"PRIuMAX"\t%"PRIuMAX"\t",
2812 file->added, file->deleted);
2813 if (options->line_termination) {
2814 fill_print_name(file);
2815 if (!file->is_renamed)
2816 write_name_quoted(file->name, options->file,
2817 options->line_termination);
2818 else {
2819 fputs(file->print_name, options->file);
2820 putc(options->line_termination, options->file);
2821 }
2822 } else {
2823 if (file->is_renamed) {
2824 putc('\0', options->file);
2825 write_name_quoted(file->from_name, options->file, '\0');
2826 }
2827 write_name_quoted(file->name, options->file, '\0');
2828 }
2829 }
2830 }
2831
2832 struct dirstat_file {
2833 const char *name;
2834 unsigned long changed;
2835 };
2836
2837 struct dirstat_dir {
2838 struct dirstat_file *files;
2839 int alloc, nr, permille, cumulative;
2840 };
2841
2842 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2843 unsigned long changed, const char *base, int baselen)
2844 {
2845 unsigned long sum_changes = 0;
2846 unsigned int sources = 0;
2847 const char *line_prefix = diff_line_prefix(opt);
2848
2849 while (dir->nr) {
2850 struct dirstat_file *f = dir->files;
2851 int namelen = strlen(f->name);
2852 unsigned long changes;
2853 char *slash;
2854
2855 if (namelen < baselen)
2856 break;
2857 if (memcmp(f->name, base, baselen))
2858 break;
2859 slash = strchr(f->name + baselen, '/');
2860 if (slash) {
2861 int newbaselen = slash + 1 - f->name;
2862 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2863 sources++;
2864 } else {
2865 changes = f->changed;
2866 dir->files++;
2867 dir->nr--;
2868 sources += 2;
2869 }
2870 sum_changes += changes;
2871 }
2872
2873 /*
2874 * We don't report dirstat's for
2875 * - the top level
2876 * - or cases where everything came from a single directory
2877 * under this directory (sources == 1).
2878 */
2879 if (baselen && sources != 1) {
2880 if (sum_changes) {
2881 int permille = sum_changes * 1000 / changed;
2882 if (permille >= dir->permille) {
2883 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2884 permille / 10, permille % 10, baselen, base);
2885 if (!dir->cumulative)
2886 return 0;
2887 }
2888 }
2889 }
2890 return sum_changes;
2891 }
2892
2893 static int dirstat_compare(const void *_a, const void *_b)
2894 {
2895 const struct dirstat_file *a = _a;
2896 const struct dirstat_file *b = _b;
2897 return strcmp(a->name, b->name);
2898 }
2899
2900 static void show_dirstat(struct diff_options *options)
2901 {
2902 int i;
2903 unsigned long changed;
2904 struct dirstat_dir dir;
2905 struct diff_queue_struct *q = &diff_queued_diff;
2906
2907 dir.files = NULL;
2908 dir.alloc = 0;
2909 dir.nr = 0;
2910 dir.permille = options->dirstat_permille;
2911 dir.cumulative = options->flags.dirstat_cumulative;
2912
2913 changed = 0;
2914 for (i = 0; i < q->nr; i++) {
2915 struct diff_filepair *p = q->queue[i];
2916 const char *name;
2917 unsigned long copied, added, damage;
2918 int content_changed;
2919
2920 name = p->two->path ? p->two->path : p->one->path;
2921
2922 if (p->one->oid_valid && p->two->oid_valid)
2923 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2924 else
2925 content_changed = 1;
2926
2927 if (!content_changed) {
2928 /*
2929 * The SHA1 has not changed, so pre-/post-content is
2930 * identical. We can therefore skip looking at the
2931 * file contents altogether.
2932 */
2933 damage = 0;
2934 goto found_damage;
2935 }
2936
2937 if (options->flags.dirstat_by_file) {
2938 /*
2939 * In --dirstat-by-file mode, we don't really need to
2940 * look at the actual file contents at all.
2941 * The fact that the SHA1 changed is enough for us to
2942 * add this file to the list of results
2943 * (with each file contributing equal damage).
2944 */
2945 damage = 1;
2946 goto found_damage;
2947 }
2948
2949 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2950 diff_populate_filespec(p->one, 0);
2951 diff_populate_filespec(p->two, 0);
2952 diffcore_count_changes(p->one, p->two, NULL, NULL,
2953 &copied, &added);
2954 diff_free_filespec_data(p->one);
2955 diff_free_filespec_data(p->two);
2956 } else if (DIFF_FILE_VALID(p->one)) {
2957 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2958 copied = added = 0;
2959 diff_free_filespec_data(p->one);
2960 } else if (DIFF_FILE_VALID(p->two)) {
2961 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2962 copied = 0;
2963 added = p->two->size;
2964 diff_free_filespec_data(p->two);
2965 } else
2966 continue;
2967
2968 /*
2969 * Original minus copied is the removed material,
2970 * added is the new material. They are both damages
2971 * made to the preimage.
2972 * If the resulting damage is zero, we know that
2973 * diffcore_count_changes() considers the two entries to
2974 * be identical, but since content_changed is true, we
2975 * know that there must have been _some_ kind of change,
2976 * so we force all entries to have damage > 0.
2977 */
2978 damage = (p->one->size - copied) + added;
2979 if (!damage)
2980 damage = 1;
2981
2982 found_damage:
2983 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2984 dir.files[dir.nr].name = name;
2985 dir.files[dir.nr].changed = damage;
2986 changed += damage;
2987 dir.nr++;
2988 }
2989
2990 /* This can happen even with many files, if everything was renames */
2991 if (!changed)
2992 return;
2993
2994 /* Show all directories with more than x% of the changes */
2995 QSORT(dir.files, dir.nr, dirstat_compare);
2996 gather_dirstat(options, &dir, changed, "", 0);
2997 }
2998
2999 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3000 {
3001 int i;
3002 unsigned long changed;
3003 struct dirstat_dir dir;
3004
3005 if (data->nr == 0)
3006 return;
3007
3008 dir.files = NULL;
3009 dir.alloc = 0;
3010 dir.nr = 0;
3011 dir.permille = options->dirstat_permille;
3012 dir.cumulative = options->flags.dirstat_cumulative;
3013
3014 changed = 0;
3015 for (i = 0; i < data->nr; i++) {
3016 struct diffstat_file *file = data->files[i];
3017 unsigned long damage = file->added + file->deleted;
3018 if (file->is_binary)
3019 /*
3020 * binary files counts bytes, not lines. Must find some
3021 * way to normalize binary bytes vs. textual lines.
3022 * The following heuristic assumes that there are 64
3023 * bytes per "line".
3024 * This is stupid and ugly, but very cheap...
3025 */
3026 damage = DIV_ROUND_UP(damage, 64);
3027 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3028 dir.files[dir.nr].name = file->name;
3029 dir.files[dir.nr].changed = damage;
3030 changed += damage;
3031 dir.nr++;
3032 }
3033
3034 /* This can happen even with many files, if everything was renames */
3035 if (!changed)
3036 return;
3037
3038 /* Show all directories with more than x% of the changes */
3039 QSORT(dir.files, dir.nr, dirstat_compare);
3040 gather_dirstat(options, &dir, changed, "", 0);
3041 }
3042
3043 static void free_diffstat_info(struct diffstat_t *diffstat)
3044 {
3045 int i;
3046 for (i = 0; i < diffstat->nr; i++) {
3047 struct diffstat_file *f = diffstat->files[i];
3048 free(f->print_name);
3049 free(f->name);
3050 free(f->from_name);
3051 free(f);
3052 }
3053 free(diffstat->files);
3054 }
3055
3056 struct checkdiff_t {
3057 const char *filename;
3058 int lineno;
3059 int conflict_marker_size;
3060 struct diff_options *o;
3061 unsigned ws_rule;
3062 unsigned status;
3063 };
3064
3065 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3066 {
3067 char firstchar;
3068 int cnt;
3069
3070 if (len < marker_size + 1)
3071 return 0;
3072 firstchar = line[0];
3073 switch (firstchar) {
3074 case '=': case '>': case '<': case '|':
3075 break;
3076 default:
3077 return 0;
3078 }
3079 for (cnt = 1; cnt < marker_size; cnt++)
3080 if (line[cnt] != firstchar)
3081 return 0;
3082 /* line[1] thru line[marker_size-1] are same as firstchar */
3083 if (len < marker_size + 1 || !isspace(line[marker_size]))
3084 return 0;
3085 return 1;
3086 }
3087
3088 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3089 {
3090 struct checkdiff_t *data = priv;
3091 int marker_size = data->conflict_marker_size;
3092 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3093 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3094 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3095 char *err;
3096 const char *line_prefix;
3097
3098 assert(data->o);
3099 line_prefix = diff_line_prefix(data->o);
3100
3101 if (line[0] == '+') {
3102 unsigned bad;
3103 data->lineno++;
3104 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3105 data->status |= 1;
3106 fprintf(data->o->file,
3107 "%s%s:%d: leftover conflict marker\n",
3108 line_prefix, data->filename, data->lineno);
3109 }
3110 bad = ws_check(line + 1, len - 1, data->ws_rule);
3111 if (!bad)
3112 return;
3113 data->status |= bad;
3114 err = whitespace_error_string(bad);
3115 fprintf(data->o->file, "%s%s:%d: %s.\n",
3116 line_prefix, data->filename, data->lineno, err);
3117 free(err);
3118 emit_line(data->o, set, reset, line, 1);
3119 ws_check_emit(line + 1, len - 1, data->ws_rule,
3120 data->o->file, set, reset, ws);
3121 } else if (line[0] == ' ') {
3122 data->lineno++;
3123 } else if (line[0] == '@') {
3124 char *plus = strchr(line, '+');
3125 if (plus)
3126 data->lineno = strtol(plus, NULL, 10) - 1;
3127 else
3128 die("invalid diff");
3129 }
3130 }
3131
3132 static unsigned char *deflate_it(char *data,
3133 unsigned long size,
3134 unsigned long *result_size)
3135 {
3136 int bound;
3137 unsigned char *deflated;
3138 git_zstream stream;
3139
3140 git_deflate_init(&stream, zlib_compression_level);
3141 bound = git_deflate_bound(&stream, size);
3142 deflated = xmalloc(bound);
3143 stream.next_out = deflated;
3144 stream.avail_out = bound;
3145
3146 stream.next_in = (unsigned char *)data;
3147 stream.avail_in = size;
3148 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3149 ; /* nothing */
3150 git_deflate_end(&stream);
3151 *result_size = stream.total_out;
3152 return deflated;
3153 }
3154
3155 static void emit_binary_diff_body(struct diff_options *o,
3156 mmfile_t *one, mmfile_t *two)
3157 {
3158 void *cp;
3159 void *delta;
3160 void *deflated;
3161 void *data;
3162 unsigned long orig_size;
3163 unsigned long delta_size;
3164 unsigned long deflate_size;
3165 unsigned long data_size;
3166
3167 /* We could do deflated delta, or we could do just deflated two,
3168 * whichever is smaller.
3169 */
3170 delta = NULL;
3171 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3172 if (one->size && two->size) {
3173 delta = diff_delta(one->ptr, one->size,
3174 two->ptr, two->size,
3175 &delta_size, deflate_size);
3176 if (delta) {
3177 void *to_free = delta;
3178 orig_size = delta_size;
3179 delta = deflate_it(delta, delta_size, &delta_size);
3180 free(to_free);
3181 }
3182 }
3183
3184 if (delta && delta_size < deflate_size) {
3185 char *s = xstrfmt("%lu", orig_size);
3186 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3187 s, strlen(s), 0);
3188 free(s);
3189 free(deflated);
3190 data = delta;
3191 data_size = delta_size;
3192 } else {
3193 char *s = xstrfmt("%lu", two->size);
3194 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3195 s, strlen(s), 0);
3196 free(s);
3197 free(delta);
3198 data = deflated;
3199 data_size = deflate_size;
3200 }
3201
3202 /* emit data encoded in base85 */
3203 cp = data;
3204 while (data_size) {
3205 int len;
3206 int bytes = (52 < data_size) ? 52 : data_size;
3207 char line[71];
3208 data_size -= bytes;
3209 if (bytes <= 26)
3210 line[0] = bytes + 'A' - 1;
3211 else
3212 line[0] = bytes - 26 + 'a' - 1;
3213 encode_85(line + 1, cp, bytes);
3214 cp = (char *) cp + bytes;
3215
3216 len = strlen(line);
3217 line[len++] = '\n';
3218 line[len] = '\0';
3219
3220 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3221 line, len, 0);
3222 }
3223 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3224 free(data);
3225 }
3226
3227 static void emit_binary_diff(struct diff_options *o,
3228 mmfile_t *one, mmfile_t *two)
3229 {
3230 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3231 emit_binary_diff_body(o, one, two);
3232 emit_binary_diff_body(o, two, one);
3233 }
3234
3235 int diff_filespec_is_binary(struct diff_filespec *one)
3236 {
3237 if (one->is_binary == -1) {
3238 diff_filespec_load_driver(one);
3239 if (one->driver->binary != -1)
3240 one->is_binary = one->driver->binary;
3241 else {
3242 if (!one->data && DIFF_FILE_VALID(one))
3243 diff_populate_filespec(one, CHECK_BINARY);
3244 if (one->is_binary == -1 && one->data)
3245 one->is_binary = buffer_is_binary(one->data,
3246 one->size);
3247 if (one->is_binary == -1)
3248 one->is_binary = 0;
3249 }
3250 }
3251 return one->is_binary;
3252 }
3253
3254 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
3255 {
3256 diff_filespec_load_driver(one);
3257 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3258 }
3259
3260 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3261 {
3262 if (!options->a_prefix)
3263 options->a_prefix = a;
3264 if (!options->b_prefix)
3265 options->b_prefix = b;
3266 }
3267
3268 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3269 {
3270 if (!DIFF_FILE_VALID(one))
3271 return NULL;
3272
3273 diff_filespec_load_driver(one);
3274 return userdiff_get_textconv(one->driver);
3275 }
3276
3277 static void builtin_diff(const char *name_a,
3278 const char *name_b,
3279 struct diff_filespec *one,
3280 struct diff_filespec *two,
3281 const char *xfrm_msg,
3282 int must_show_header,
3283 struct diff_options *o,
3284 int complete_rewrite)
3285 {
3286 mmfile_t mf1, mf2;
3287 const char *lbl[2];
3288 char *a_one, *b_two;
3289 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3290 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3291 const char *a_prefix, *b_prefix;
3292 struct userdiff_driver *textconv_one = NULL;
3293 struct userdiff_driver *textconv_two = NULL;
3294 struct strbuf header = STRBUF_INIT;
3295 const char *line_prefix = diff_line_prefix(o);
3296
3297 diff_set_mnemonic_prefix(o, "a/", "b/");
3298 if (o->flags.reverse_diff) {
3299 a_prefix = o->b_prefix;
3300 b_prefix = o->a_prefix;
3301 } else {
3302 a_prefix = o->a_prefix;
3303 b_prefix = o->b_prefix;
3304 }
3305
3306 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3307 (!one->mode || S_ISGITLINK(one->mode)) &&
3308 (!two->mode || S_ISGITLINK(two->mode))) {
3309 show_submodule_summary(o, one->path ? one->path : two->path,
3310 &one->oid, &two->oid,
3311 two->dirty_submodule);
3312 return;
3313 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3314 (!one->mode || S_ISGITLINK(one->mode)) &&
3315 (!two->mode || S_ISGITLINK(two->mode))) {
3316 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3317 &one->oid, &two->oid,
3318 two->dirty_submodule);
3319 return;
3320 }
3321
3322 if (o->flags.allow_textconv) {
3323 textconv_one = get_textconv(one);
3324 textconv_two = get_textconv(two);
3325 }
3326
3327 /* Never use a non-valid filename anywhere if at all possible */
3328 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3329 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3330
3331 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3332 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3333 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3334 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3335 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3336 if (lbl[0][0] == '/') {
3337 /* /dev/null */
3338 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3339 if (xfrm_msg)
3340 strbuf_addstr(&header, xfrm_msg);
3341 must_show_header = 1;
3342 }
3343 else if (lbl[1][0] == '/') {
3344 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3345 if (xfrm_msg)
3346 strbuf_addstr(&header, xfrm_msg);
3347 must_show_header = 1;
3348 }
3349 else {
3350 if (one->mode != two->mode) {
3351 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3352 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3353 must_show_header = 1;
3354 }
3355 if (xfrm_msg)
3356 strbuf_addstr(&header, xfrm_msg);
3357
3358 /*
3359 * we do not run diff between different kind
3360 * of objects.
3361 */
3362 if ((one->mode ^ two->mode) & S_IFMT)
3363 goto free_ab_and_return;
3364 if (complete_rewrite &&
3365 (textconv_one || !diff_filespec_is_binary(one)) &&
3366 (textconv_two || !diff_filespec_is_binary(two))) {
3367 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3368 header.buf, header.len, 0);
3369 strbuf_reset(&header);
3370 emit_rewrite_diff(name_a, name_b, one, two,
3371 textconv_one, textconv_two, o);
3372 o->found_changes = 1;
3373 goto free_ab_and_return;
3374 }
3375 }
3376
3377 if (o->irreversible_delete && lbl[1][0] == '/') {
3378 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3379 header.len, 0);
3380 strbuf_reset(&header);
3381 goto free_ab_and_return;
3382 } else if (!o->flags.text &&
3383 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3384 (!textconv_two && diff_filespec_is_binary(two)) )) {
3385 struct strbuf sb = STRBUF_INIT;
3386 if (!one->data && !two->data &&
3387 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3388 !o->flags.binary) {
3389 if (!oidcmp(&one->oid, &two->oid)) {
3390 if (must_show_header)
3391 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3392 header.buf, header.len,
3393 0);
3394 goto free_ab_and_return;
3395 }
3396 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3397 header.buf, header.len, 0);
3398 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3399 diff_line_prefix(o), lbl[0], lbl[1]);
3400 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3401 sb.buf, sb.len, 0);
3402 strbuf_release(&sb);
3403 goto free_ab_and_return;
3404 }
3405 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3406 die("unable to read files to diff");
3407 /* Quite common confusing case */
3408 if (mf1.size == mf2.size &&
3409 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3410 if (must_show_header)
3411 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3412 header.buf, header.len, 0);
3413 goto free_ab_and_return;
3414 }
3415 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3416 strbuf_reset(&header);
3417 if (o->flags.binary)
3418 emit_binary_diff(o, &mf1, &mf2);
3419 else {
3420 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3421 diff_line_prefix(o), lbl[0], lbl[1]);
3422 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3423 sb.buf, sb.len, 0);
3424 strbuf_release(&sb);
3425 }
3426 o->found_changes = 1;
3427 } else {
3428 /* Crazy xdl interfaces.. */
3429 const char *diffopts = getenv("GIT_DIFF_OPTS");
3430 const char *v;
3431 xpparam_t xpp;
3432 xdemitconf_t xecfg;
3433 struct emit_callback ecbdata;
3434 const struct userdiff_funcname *pe;
3435
3436 if (must_show_header) {
3437 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3438 header.buf, header.len, 0);
3439 strbuf_reset(&header);
3440 }
3441
3442 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3443 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3444
3445 pe = diff_funcname_pattern(one);
3446 if (!pe)
3447 pe = diff_funcname_pattern(two);
3448
3449 memset(&xpp, 0, sizeof(xpp));
3450 memset(&xecfg, 0, sizeof(xecfg));
3451 memset(&ecbdata, 0, sizeof(ecbdata));
3452 if (o->flags.suppress_diff_headers)
3453 lbl[0] = NULL;
3454 ecbdata.label_path = lbl;
3455 ecbdata.color_diff = want_color(o->use_color);
3456 ecbdata.ws_rule = whitespace_rule(name_b);
3457 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3458 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3459 ecbdata.opt = o;
3460 if (header.len && !o->flags.suppress_diff_headers)
3461 ecbdata.header = &header;
3462 xpp.flags = o->xdl_opts;
3463 xpp.anchors = o->anchors;
3464 xpp.anchors_nr = o->anchors_nr;
3465 xecfg.ctxlen = o->context;
3466 xecfg.interhunkctxlen = o->interhunkcontext;
3467 xecfg.flags = XDL_EMIT_FUNCNAMES;
3468 if (o->flags.funccontext)
3469 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3470 if (pe)
3471 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3472 if (!diffopts)
3473 ;
3474 else if (skip_prefix(diffopts, "--unified=", &v))
3475 xecfg.ctxlen = strtoul(v, NULL, 10);
3476 else if (skip_prefix(diffopts, "-u", &v))
3477 xecfg.ctxlen = strtoul(v, NULL, 10);
3478 if (o->word_diff)
3479 init_diff_words_data(&ecbdata, o, one, two);
3480 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3481 &xpp, &xecfg))
3482 die("unable to generate diff for %s", one->path);
3483 if (o->word_diff)
3484 free_diff_words_data(&ecbdata);
3485 if (textconv_one)
3486 free(mf1.ptr);
3487 if (textconv_two)
3488 free(mf2.ptr);
3489 xdiff_clear_find_func(&xecfg);
3490 }
3491
3492 free_ab_and_return:
3493 strbuf_release(&header);
3494 diff_free_filespec_data(one);
3495 diff_free_filespec_data(two);
3496 free(a_one);
3497 free(b_two);
3498 return;
3499 }
3500
3501 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3502 {
3503 if (!is_renamed) {
3504 if (p->status == DIFF_STATUS_ADDED) {
3505 if (S_ISLNK(p->two->mode))
3506 return "new +l";
3507 else if ((p->two->mode & 0777) == 0755)
3508 return "new +x";
3509 else
3510 return "new";
3511 } else if (p->status == DIFF_STATUS_DELETED)
3512 return "gone";
3513 }
3514 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3515 return "mode -l";
3516 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3517 return "mode +l";
3518 else if ((p->one->mode & 0777) == 0644 &&
3519 (p->two->mode & 0777) == 0755)
3520 return "mode +x";
3521 else if ((p->one->mode & 0777) == 0755 &&
3522 (p->two->mode & 0777) == 0644)
3523 return "mode -x";
3524 return NULL;
3525 }
3526
3527 static void builtin_diffstat(const char *name_a, const char *name_b,
3528 struct diff_filespec *one,
3529 struct diff_filespec *two,
3530 struct diffstat_t *diffstat,
3531 struct diff_options *o,
3532 struct diff_filepair *p)
3533 {
3534 mmfile_t mf1, mf2;
3535 struct diffstat_file *data;
3536 int same_contents;
3537 int complete_rewrite = 0;
3538
3539 if (!DIFF_PAIR_UNMERGED(p)) {
3540 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3541 complete_rewrite = 1;
3542 }
3543
3544 data = diffstat_add(diffstat, name_a, name_b);
3545 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3546 if (o->flags.stat_with_summary)
3547 data->comments = get_compact_summary(p, data->is_renamed);
3548
3549 if (!one || !two) {
3550 data->is_unmerged = 1;
3551 return;
3552 }
3553
3554 same_contents = !oidcmp(&one->oid, &two->oid);
3555
3556 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3557 data->is_binary = 1;
3558 if (same_contents) {
3559 data->added = 0;
3560 data->deleted = 0;
3561 } else {
3562 data->added = diff_filespec_size(two);
3563 data->deleted = diff_filespec_size(one);
3564 }
3565 }
3566
3567 else if (complete_rewrite) {
3568 diff_populate_filespec(one, 0);
3569 diff_populate_filespec(two, 0);
3570 data->deleted = count_lines(one->data, one->size);
3571 data->added = count_lines(two->data, two->size);
3572 }
3573
3574 else if (!same_contents) {
3575 /* Crazy xdl interfaces.. */
3576 xpparam_t xpp;
3577 xdemitconf_t xecfg;
3578
3579 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3580 die("unable to read files to diff");
3581
3582 memset(&xpp, 0, sizeof(xpp));
3583 memset(&xecfg, 0, sizeof(xecfg));
3584 xpp.flags = o->xdl_opts;
3585 xpp.anchors = o->anchors;
3586 xpp.anchors_nr = o->anchors_nr;
3587 xecfg.ctxlen = o->context;
3588 xecfg.interhunkctxlen = o->interhunkcontext;
3589 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3590 &xpp, &xecfg))
3591 die("unable to generate diffstat for %s", one->path);
3592 }
3593
3594 diff_free_filespec_data(one);
3595 diff_free_filespec_data(two);
3596 }
3597
3598 static void builtin_checkdiff(const char *name_a, const char *name_b,
3599 const char *attr_path,
3600 struct diff_filespec *one,
3601 struct diff_filespec *two,
3602 struct diff_options *o)
3603 {
3604 mmfile_t mf1, mf2;
3605 struct checkdiff_t data;
3606
3607 if (!two)
3608 return;
3609
3610 memset(&data, 0, sizeof(data));
3611 data.filename = name_b ? name_b : name_a;
3612 data.lineno = 0;
3613 data.o = o;
3614 data.ws_rule = whitespace_rule(attr_path);
3615 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3616
3617 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3618 die("unable to read files to diff");
3619
3620 /*
3621 * All the other codepaths check both sides, but not checking
3622 * the "old" side here is deliberate. We are checking the newly
3623 * introduced changes, and as long as the "new" side is text, we
3624 * can and should check what it introduces.
3625 */
3626 if (diff_filespec_is_binary(two))
3627 goto free_and_return;
3628 else {
3629 /* Crazy xdl interfaces.. */
3630 xpparam_t xpp;
3631 xdemitconf_t xecfg;
3632
3633 memset(&xpp, 0, sizeof(xpp));
3634 memset(&xecfg, 0, sizeof(xecfg));
3635 xecfg.ctxlen = 1; /* at least one context line */
3636 xpp.flags = 0;
3637 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3638 &xpp, &xecfg))
3639 die("unable to generate checkdiff for %s", one->path);
3640
3641 if (data.ws_rule & WS_BLANK_AT_EOF) {
3642 struct emit_callback ecbdata;
3643 int blank_at_eof;
3644
3645 ecbdata.ws_rule = data.ws_rule;
3646 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3647 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3648
3649 if (blank_at_eof) {
3650 static char *err;
3651 if (!err)
3652 err = whitespace_error_string(WS_BLANK_AT_EOF);
3653 fprintf(o->file, "%s:%d: %s.\n",
3654 data.filename, blank_at_eof, err);
3655 data.status = 1; /* report errors */
3656 }
3657 }
3658 }
3659 free_and_return:
3660 diff_free_filespec_data(one);
3661 diff_free_filespec_data(two);
3662 if (data.status)
3663 o->flags.check_failed = 1;
3664 }
3665
3666 struct diff_filespec *alloc_filespec(const char *path)
3667 {
3668 struct diff_filespec *spec;
3669
3670 FLEXPTR_ALLOC_STR(spec, path, path);
3671 spec->count = 1;
3672 spec->is_binary = -1;
3673 return spec;
3674 }
3675
3676 void free_filespec(struct diff_filespec *spec)
3677 {
3678 if (!--spec->count) {
3679 diff_free_filespec_data(spec);
3680 free(spec);
3681 }
3682 }
3683
3684 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3685 int oid_valid, unsigned short mode)
3686 {
3687 if (mode) {
3688 spec->mode = canon_mode(mode);
3689 oidcpy(&spec->oid, oid);
3690 spec->oid_valid = oid_valid;
3691 }
3692 }
3693
3694 /*
3695 * Given a name and sha1 pair, if the index tells us the file in
3696 * the work tree has that object contents, return true, so that
3697 * prepare_temp_file() does not have to inflate and extract.
3698 */
3699 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3700 {
3701 const struct cache_entry *ce;
3702 struct stat st;
3703 int pos, len;
3704
3705 /*
3706 * We do not read the cache ourselves here, because the
3707 * benchmark with my previous version that always reads cache
3708 * shows that it makes things worse for diff-tree comparing
3709 * two linux-2.6 kernel trees in an already checked out work
3710 * tree. This is because most diff-tree comparisons deal with
3711 * only a small number of files, while reading the cache is
3712 * expensive for a large project, and its cost outweighs the
3713 * savings we get by not inflating the object to a temporary
3714 * file. Practically, this code only helps when we are used
3715 * by diff-cache --cached, which does read the cache before
3716 * calling us.
3717 */
3718 if (!active_cache)
3719 return 0;
3720
3721 /* We want to avoid the working directory if our caller
3722 * doesn't need the data in a normal file, this system
3723 * is rather slow with its stat/open/mmap/close syscalls,
3724 * and the object is contained in a pack file. The pack
3725 * is probably already open and will be faster to obtain
3726 * the data through than the working directory. Loose
3727 * objects however would tend to be slower as they need
3728 * to be individually opened and inflated.
3729 */
3730 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3731 return 0;
3732
3733 /*
3734 * Similarly, if we'd have to convert the file contents anyway, that
3735 * makes the optimization not worthwhile.
3736 */
3737 if (!want_file && would_convert_to_git(&the_index, name))
3738 return 0;
3739
3740 len = strlen(name);
3741 pos = cache_name_pos(name, len);
3742 if (pos < 0)
3743 return 0;
3744 ce = active_cache[pos];
3745
3746 /*
3747 * This is not the sha1 we are looking for, or
3748 * unreusable because it is not a regular file.
3749 */
3750 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3751 return 0;
3752
3753 /*
3754 * If ce is marked as "assume unchanged", there is no
3755 * guarantee that work tree matches what we are looking for.
3756 */
3757 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3758 return 0;
3759
3760 /*
3761 * If ce matches the file in the work tree, we can reuse it.
3762 */
3763 if (ce_uptodate(ce) ||
3764 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3765 return 1;
3766
3767 return 0;
3768 }
3769
3770 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3771 {
3772 struct strbuf buf = STRBUF_INIT;
3773 char *dirty = "";
3774
3775 /* Are we looking at the work tree? */
3776 if (s->dirty_submodule)
3777 dirty = "-dirty";
3778
3779 strbuf_addf(&buf, "Subproject commit %s%s\n",
3780 oid_to_hex(&s->oid), dirty);
3781 s->size = buf.len;
3782 if (size_only) {
3783 s->data = NULL;
3784 strbuf_release(&buf);
3785 } else {
3786 s->data = strbuf_detach(&buf, NULL);
3787 s->should_free = 1;
3788 }
3789 return 0;
3790 }
3791
3792 /*
3793 * While doing rename detection and pickaxe operation, we may need to
3794 * grab the data for the blob (or file) for our own in-core comparison.
3795 * diff_filespec has data and size fields for this purpose.
3796 */
3797 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3798 {
3799 int size_only = flags & CHECK_SIZE_ONLY;
3800 int err = 0;
3801 int conv_flags = global_conv_flags_eol;
3802 /*
3803 * demote FAIL to WARN to allow inspecting the situation
3804 * instead of refusing.
3805 */
3806 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3807 conv_flags = CONV_EOL_RNDTRP_WARN;
3808
3809 if (!DIFF_FILE_VALID(s))
3810 die("internal error: asking to populate invalid file.");
3811 if (S_ISDIR(s->mode))
3812 return -1;
3813
3814 if (s->data)
3815 return 0;
3816
3817 if (size_only && 0 < s->size)
3818 return 0;
3819
3820 if (S_ISGITLINK(s->mode))
3821 return diff_populate_gitlink(s, size_only);
3822
3823 if (!s->oid_valid ||
3824 reuse_worktree_file(s->path, &s->oid, 0)) {
3825 struct strbuf buf = STRBUF_INIT;
3826 struct stat st;
3827 int fd;
3828
3829 if (lstat(s->path, &st) < 0) {
3830 err_empty:
3831 err = -1;
3832 empty:
3833 s->data = (char *)"";
3834 s->size = 0;
3835 return err;
3836 }
3837 s->size = xsize_t(st.st_size);
3838 if (!s->size)
3839 goto empty;
3840 if (S_ISLNK(st.st_mode)) {
3841 struct strbuf sb = STRBUF_INIT;
3842
3843 if (strbuf_readlink(&sb, s->path, s->size))
3844 goto err_empty;
3845 s->size = sb.len;
3846 s->data = strbuf_detach(&sb, NULL);
3847 s->should_free = 1;
3848 return 0;
3849 }
3850
3851 /*
3852 * Even if the caller would be happy with getting
3853 * only the size, we cannot return early at this
3854 * point if the path requires us to run the content
3855 * conversion.
3856 */
3857 if (size_only && !would_convert_to_git(&the_index, s->path))
3858 return 0;
3859
3860 /*
3861 * Note: this check uses xsize_t(st.st_size) that may
3862 * not be the true size of the blob after it goes
3863 * through convert_to_git(). This may not strictly be
3864 * correct, but the whole point of big_file_threshold
3865 * and is_binary check being that we want to avoid
3866 * opening the file and inspecting the contents, this
3867 * is probably fine.
3868 */
3869 if ((flags & CHECK_BINARY) &&
3870 s->size > big_file_threshold && s->is_binary == -1) {
3871 s->is_binary = 1;
3872 return 0;
3873 }
3874 fd = open(s->path, O_RDONLY);
3875 if (fd < 0)
3876 goto err_empty;
3877 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3878 close(fd);
3879 s->should_munmap = 1;
3880
3881 /*
3882 * Convert from working tree format to canonical git format
3883 */
3884 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
3885 size_t size = 0;
3886 munmap(s->data, s->size);
3887 s->should_munmap = 0;
3888 s->data = strbuf_detach(&buf, &size);
3889 s->size = size;
3890 s->should_free = 1;
3891 }
3892 }
3893 else {
3894 enum object_type type;
3895 if (size_only || (flags & CHECK_BINARY)) {
3896 type = oid_object_info(the_repository, &s->oid,
3897 &s->size);
3898 if (type < 0)
3899 die("unable to read %s",
3900 oid_to_hex(&s->oid));
3901 if (size_only)
3902 return 0;
3903 if (s->size > big_file_threshold && s->is_binary == -1) {
3904 s->is_binary = 1;
3905 return 0;
3906 }
3907 }
3908 s->data = read_object_file(&s->oid, &type, &s->size);
3909 if (!s->data)
3910 die("unable to read %s", oid_to_hex(&s->oid));
3911 s->should_free = 1;
3912 }
3913 return 0;
3914 }
3915
3916 void diff_free_filespec_blob(struct diff_filespec *s)
3917 {
3918 if (s->should_free)
3919 free(s->data);
3920 else if (s->should_munmap)
3921 munmap(s->data, s->size);
3922
3923 if (s->should_free || s->should_munmap) {
3924 s->should_free = s->should_munmap = 0;
3925 s->data = NULL;
3926 }
3927 }
3928
3929 void diff_free_filespec_data(struct diff_filespec *s)
3930 {
3931 diff_free_filespec_blob(s);
3932 FREE_AND_NULL(s->cnt_data);
3933 }
3934
3935 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3936 void *blob,
3937 unsigned long size,
3938 const struct object_id *oid,
3939 int mode)
3940 {
3941 struct strbuf buf = STRBUF_INIT;
3942 struct strbuf tempfile = STRBUF_INIT;
3943 char *path_dup = xstrdup(path);
3944 const char *base = basename(path_dup);
3945
3946 /* Generate "XXXXXX_basename.ext" */
3947 strbuf_addstr(&tempfile, "XXXXXX_");
3948 strbuf_addstr(&tempfile, base);
3949
3950 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
3951 if (!temp->tempfile)
3952 die_errno("unable to create temp-file");
3953 if (convert_to_working_tree(path,
3954 (const char *)blob, (size_t)size, &buf)) {
3955 blob = buf.buf;
3956 size = buf.len;
3957 }
3958 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3959 close_tempfile_gently(temp->tempfile))
3960 die_errno("unable to write temp-file");
3961 temp->name = get_tempfile_path(temp->tempfile);
3962 oid_to_hex_r(temp->hex, oid);
3963 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3964 strbuf_release(&buf);
3965 strbuf_release(&tempfile);
3966 free(path_dup);
3967 }
3968
3969 static struct diff_tempfile *prepare_temp_file(const char *name,
3970 struct diff_filespec *one)
3971 {
3972 struct diff_tempfile *temp = claim_diff_tempfile();
3973
3974 if (!DIFF_FILE_VALID(one)) {
3975 not_a_valid_file:
3976 /* A '-' entry produces this for file-2, and
3977 * a '+' entry produces this for file-1.
3978 */
3979 temp->name = "/dev/null";
3980 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3981 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3982 return temp;
3983 }
3984
3985 if (!S_ISGITLINK(one->mode) &&
3986 (!one->oid_valid ||
3987 reuse_worktree_file(name, &one->oid, 1))) {
3988 struct stat st;
3989 if (lstat(name, &st) < 0) {
3990 if (errno == ENOENT)
3991 goto not_a_valid_file;
3992 die_errno("stat(%s)", name);
3993 }
3994 if (S_ISLNK(st.st_mode)) {
3995 struct strbuf sb = STRBUF_INIT;
3996 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3997 die_errno("readlink(%s)", name);
3998 prep_temp_blob(name, temp, sb.buf, sb.len,
3999 (one->oid_valid ?
4000 &one->oid : &null_oid),
4001 (one->oid_valid ?
4002 one->mode : S_IFLNK));
4003 strbuf_release(&sb);
4004 }
4005 else {
4006 /* we can borrow from the file in the work tree */
4007 temp->name = name;
4008 if (!one->oid_valid)
4009 oid_to_hex_r(temp->hex, &null_oid);
4010 else
4011 oid_to_hex_r(temp->hex, &one->oid);
4012 /* Even though we may sometimes borrow the
4013 * contents from the work tree, we always want
4014 * one->mode. mode is trustworthy even when
4015 * !(one->oid_valid), as long as
4016 * DIFF_FILE_VALID(one).
4017 */
4018 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4019 }
4020 return temp;
4021 }
4022 else {
4023 if (diff_populate_filespec(one, 0))
4024 die("cannot read data blob for %s", one->path);
4025 prep_temp_blob(name, temp, one->data, one->size,
4026 &one->oid, one->mode);
4027 }
4028 return temp;
4029 }
4030
4031 static void add_external_diff_name(struct argv_array *argv,
4032 const char *name,
4033 struct diff_filespec *df)
4034 {
4035 struct diff_tempfile *temp = prepare_temp_file(name, df);
4036 argv_array_push(argv, temp->name);
4037 argv_array_push(argv, temp->hex);
4038 argv_array_push(argv, temp->mode);
4039 }
4040
4041 /* An external diff command takes:
4042 *
4043 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4044 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4045 *
4046 */
4047 static void run_external_diff(const char *pgm,
4048 const char *name,
4049 const char *other,
4050 struct diff_filespec *one,
4051 struct diff_filespec *two,
4052 const char *xfrm_msg,
4053 int complete_rewrite,
4054 struct diff_options *o)
4055 {
4056 struct argv_array argv = ARGV_ARRAY_INIT;
4057 struct argv_array env = ARGV_ARRAY_INIT;
4058 struct diff_queue_struct *q = &diff_queued_diff;
4059
4060 argv_array_push(&argv, pgm);
4061 argv_array_push(&argv, name);
4062
4063 if (one && two) {
4064 add_external_diff_name(&argv, name, one);
4065 if (!other)
4066 add_external_diff_name(&argv, name, two);
4067 else {
4068 add_external_diff_name(&argv, other, two);
4069 argv_array_push(&argv, other);
4070 argv_array_push(&argv, xfrm_msg);
4071 }
4072 }
4073
4074 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4075 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4076
4077 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4078 die(_("external diff died, stopping at %s"), name);
4079
4080 remove_tempfile();
4081 argv_array_clear(&argv);
4082 argv_array_clear(&env);
4083 }
4084
4085 static int similarity_index(struct diff_filepair *p)
4086 {
4087 return p->score * 100 / MAX_SCORE;
4088 }
4089
4090 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4091 {
4092 if (startup_info->have_repository)
4093 return find_unique_abbrev(oid, abbrev);
4094 else {
4095 char *hex = oid_to_hex(oid);
4096 if (abbrev < 0)
4097 abbrev = FALLBACK_DEFAULT_ABBREV;
4098 if (abbrev > the_hash_algo->hexsz)
4099 BUG("oid abbreviation out of range: %d", abbrev);
4100 if (abbrev)
4101 hex[abbrev] = '\0';
4102 return hex;
4103 }
4104 }
4105
4106 static void fill_metainfo(struct strbuf *msg,
4107 const char *name,
4108 const char *other,
4109 struct diff_filespec *one,
4110 struct diff_filespec *two,
4111 struct diff_options *o,
4112 struct diff_filepair *p,
4113 int *must_show_header,
4114 int use_color)
4115 {
4116 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4117 const char *reset = diff_get_color(use_color, DIFF_RESET);
4118 const char *line_prefix = diff_line_prefix(o);
4119
4120 *must_show_header = 1;
4121 strbuf_init(msg, PATH_MAX * 2 + 300);
4122 switch (p->status) {
4123 case DIFF_STATUS_COPIED:
4124 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4125 line_prefix, set, similarity_index(p));
4126 strbuf_addf(msg, "%s\n%s%scopy from ",
4127 reset, line_prefix, set);
4128 quote_c_style(name, msg, NULL, 0);
4129 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4130 quote_c_style(other, msg, NULL, 0);
4131 strbuf_addf(msg, "%s\n", reset);
4132 break;
4133 case DIFF_STATUS_RENAMED:
4134 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4135 line_prefix, set, similarity_index(p));
4136 strbuf_addf(msg, "%s\n%s%srename from ",
4137 reset, line_prefix, set);
4138 quote_c_style(name, msg, NULL, 0);
4139 strbuf_addf(msg, "%s\n%s%srename to ",
4140 reset, line_prefix, set);
4141 quote_c_style(other, msg, NULL, 0);
4142 strbuf_addf(msg, "%s\n", reset);
4143 break;
4144 case DIFF_STATUS_MODIFIED:
4145 if (p->score) {
4146 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4147 line_prefix,
4148 set, similarity_index(p), reset);
4149 break;
4150 }
4151 /* fallthru */
4152 default:
4153 *must_show_header = 0;
4154 }
4155 if (one && two && oidcmp(&one->oid, &two->oid)) {
4156 const unsigned hexsz = the_hash_algo->hexsz;
4157 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4158
4159 if (o->flags.binary) {
4160 mmfile_t mf;
4161 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
4162 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
4163 abbrev = hexsz;
4164 }
4165 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4166 diff_abbrev_oid(&one->oid, abbrev),
4167 diff_abbrev_oid(&two->oid, abbrev));
4168 if (one->mode == two->mode)
4169 strbuf_addf(msg, " %06o", one->mode);
4170 strbuf_addf(msg, "%s\n", reset);
4171 }
4172 }
4173
4174 static void run_diff_cmd(const char *pgm,
4175 const char *name,
4176 const char *other,
4177 const char *attr_path,
4178 struct diff_filespec *one,
4179 struct diff_filespec *two,
4180 struct strbuf *msg,
4181 struct diff_options *o,
4182 struct diff_filepair *p)
4183 {
4184 const char *xfrm_msg = NULL;
4185 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4186 int must_show_header = 0;
4187
4188
4189 if (o->flags.allow_external) {
4190 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
4191 if (drv && drv->external)
4192 pgm = drv->external;
4193 }
4194
4195 if (msg) {
4196 /*
4197 * don't use colors when the header is intended for an
4198 * external diff driver
4199 */
4200 fill_metainfo(msg, name, other, one, two, o, p,
4201 &must_show_header,
4202 want_color(o->use_color) && !pgm);
4203 xfrm_msg = msg->len ? msg->buf : NULL;
4204 }
4205
4206 if (pgm) {
4207 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4208 complete_rewrite, o);
4209 return;
4210 }
4211 if (one && two)
4212 builtin_diff(name, other ? other : name,
4213 one, two, xfrm_msg, must_show_header,
4214 o, complete_rewrite);
4215 else
4216 fprintf(o->file, "* Unmerged path %s\n", name);
4217 }
4218
4219 static void diff_fill_oid_info(struct diff_filespec *one)
4220 {
4221 if (DIFF_FILE_VALID(one)) {
4222 if (!one->oid_valid) {
4223 struct stat st;
4224 if (one->is_stdin) {
4225 oidclr(&one->oid);
4226 return;
4227 }
4228 if (lstat(one->path, &st) < 0)
4229 die_errno("stat '%s'", one->path);
4230 if (index_path(&one->oid, one->path, &st, 0))
4231 die("cannot hash %s", one->path);
4232 }
4233 }
4234 else
4235 oidclr(&one->oid);
4236 }
4237
4238 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4239 {
4240 /* Strip the prefix but do not molest /dev/null and absolute paths */
4241 if (*namep && **namep != '/') {
4242 *namep += prefix_length;
4243 if (**namep == '/')
4244 ++*namep;
4245 }
4246 if (*otherp && **otherp != '/') {
4247 *otherp += prefix_length;
4248 if (**otherp == '/')
4249 ++*otherp;
4250 }
4251 }
4252
4253 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4254 {
4255 const char *pgm = external_diff();
4256 struct strbuf msg;
4257 struct diff_filespec *one = p->one;
4258 struct diff_filespec *two = p->two;
4259 const char *name;
4260 const char *other;
4261 const char *attr_path;
4262
4263 name = one->path;
4264 other = (strcmp(name, two->path) ? two->path : NULL);
4265 attr_path = name;
4266 if (o->prefix_length)
4267 strip_prefix(o->prefix_length, &name, &other);
4268
4269 if (!o->flags.allow_external)
4270 pgm = NULL;
4271
4272 if (DIFF_PAIR_UNMERGED(p)) {
4273 run_diff_cmd(pgm, name, NULL, attr_path,
4274 NULL, NULL, NULL, o, p);
4275 return;
4276 }
4277
4278 diff_fill_oid_info(one);
4279 diff_fill_oid_info(two);
4280
4281 if (!pgm &&
4282 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4283 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4284 /*
4285 * a filepair that changes between file and symlink
4286 * needs to be split into deletion and creation.
4287 */
4288 struct diff_filespec *null = alloc_filespec(two->path);
4289 run_diff_cmd(NULL, name, other, attr_path,
4290 one, null, &msg, o, p);
4291 free(null);
4292 strbuf_release(&msg);
4293
4294 null = alloc_filespec(one->path);
4295 run_diff_cmd(NULL, name, other, attr_path,
4296 null, two, &msg, o, p);
4297 free(null);
4298 }
4299 else
4300 run_diff_cmd(pgm, name, other, attr_path,
4301 one, two, &msg, o, p);
4302
4303 strbuf_release(&msg);
4304 }
4305
4306 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4307 struct diffstat_t *diffstat)
4308 {
4309 const char *name;
4310 const char *other;
4311
4312 if (DIFF_PAIR_UNMERGED(p)) {
4313 /* unmerged */
4314 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4315 return;
4316 }
4317
4318 name = p->one->path;
4319 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4320
4321 if (o->prefix_length)
4322 strip_prefix(o->prefix_length, &name, &other);
4323
4324 diff_fill_oid_info(p->one);
4325 diff_fill_oid_info(p->two);
4326
4327 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4328 }
4329
4330 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4331 {
4332 const char *name;
4333 const char *other;
4334 const char *attr_path;
4335
4336 if (DIFF_PAIR_UNMERGED(p)) {
4337 /* unmerged */
4338 return;
4339 }
4340
4341 name = p->one->path;
4342 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4343 attr_path = other ? other : name;
4344
4345 if (o->prefix_length)
4346 strip_prefix(o->prefix_length, &name, &other);
4347
4348 diff_fill_oid_info(p->one);
4349 diff_fill_oid_info(p->two);
4350
4351 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4352 }
4353
4354 void diff_setup(struct diff_options *options)
4355 {
4356 memcpy(options, &default_diff_options, sizeof(*options));
4357
4358 options->file = stdout;
4359
4360 options->abbrev = DEFAULT_ABBREV;
4361 options->line_termination = '\n';
4362 options->break_opt = -1;
4363 options->rename_limit = -1;
4364 options->dirstat_permille = diff_dirstat_permille_default;
4365 options->context = diff_context_default;
4366 options->interhunkcontext = diff_interhunk_context_default;
4367 options->ws_error_highlight = ws_error_highlight_default;
4368 options->flags.rename_empty = 1;
4369 options->objfind = NULL;
4370
4371 /* pathchange left =NULL by default */
4372 options->change = diff_change;
4373 options->add_remove = diff_addremove;
4374 options->use_color = diff_use_color_default;
4375 options->detect_rename = diff_detect_rename_default;
4376 options->xdl_opts |= diff_algorithm;
4377 if (diff_indent_heuristic)
4378 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4379
4380 options->orderfile = diff_order_file_cfg;
4381
4382 if (diff_no_prefix) {
4383 options->a_prefix = options->b_prefix = "";
4384 } else if (!diff_mnemonic_prefix) {
4385 options->a_prefix = "a/";
4386 options->b_prefix = "b/";
4387 }
4388
4389 options->color_moved = diff_color_moved_default;
4390 options->color_moved_ws_handling = diff_color_moved_ws_default;
4391 }
4392
4393 void diff_setup_done(struct diff_options *options)
4394 {
4395 unsigned check_mask = DIFF_FORMAT_NAME |
4396 DIFF_FORMAT_NAME_STATUS |
4397 DIFF_FORMAT_CHECKDIFF |
4398 DIFF_FORMAT_NO_OUTPUT;
4399 /*
4400 * This must be signed because we're comparing against a potentially
4401 * negative value.
4402 */
4403 const int hexsz = the_hash_algo->hexsz;
4404
4405 if (options->set_default)
4406 options->set_default(options);
4407
4408 if (HAS_MULTI_BITS(options->output_format & check_mask))
4409 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4410
4411 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4412 die(_("-G, -S and --find-object are mutually exclusive"));
4413
4414 /*
4415 * Most of the time we can say "there are changes"
4416 * only by checking if there are changed paths, but
4417 * --ignore-whitespace* options force us to look
4418 * inside contents.
4419 */
4420
4421 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4422 options->flags.diff_from_contents = 1;
4423 else
4424 options->flags.diff_from_contents = 0;
4425
4426 if (options->flags.find_copies_harder)
4427 options->detect_rename = DIFF_DETECT_COPY;
4428
4429 if (!options->flags.relative_name)
4430 options->prefix = NULL;
4431 if (options->prefix)
4432 options->prefix_length = strlen(options->prefix);
4433 else
4434 options->prefix_length = 0;
4435
4436 if (options->output_format & (DIFF_FORMAT_NAME |
4437 DIFF_FORMAT_NAME_STATUS |
4438 DIFF_FORMAT_CHECKDIFF |
4439 DIFF_FORMAT_NO_OUTPUT))
4440 options->output_format &= ~(DIFF_FORMAT_RAW |
4441 DIFF_FORMAT_NUMSTAT |
4442 DIFF_FORMAT_DIFFSTAT |
4443 DIFF_FORMAT_SHORTSTAT |
4444 DIFF_FORMAT_DIRSTAT |
4445 DIFF_FORMAT_SUMMARY |
4446 DIFF_FORMAT_PATCH);
4447
4448 /*
4449 * These cases always need recursive; we do not drop caller-supplied
4450 * recursive bits for other formats here.
4451 */
4452 if (options->output_format & (DIFF_FORMAT_PATCH |
4453 DIFF_FORMAT_NUMSTAT |
4454 DIFF_FORMAT_DIFFSTAT |
4455 DIFF_FORMAT_SHORTSTAT |
4456 DIFF_FORMAT_DIRSTAT |
4457 DIFF_FORMAT_SUMMARY |
4458 DIFF_FORMAT_CHECKDIFF))
4459 options->flags.recursive = 1;
4460 /*
4461 * Also pickaxe would not work very well if you do not say recursive
4462 */
4463 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4464 options->flags.recursive = 1;
4465 /*
4466 * When patches are generated, submodules diffed against the work tree
4467 * must be checked for dirtiness too so it can be shown in the output
4468 */
4469 if (options->output_format & DIFF_FORMAT_PATCH)
4470 options->flags.dirty_submodules = 1;
4471
4472 if (options->detect_rename && options->rename_limit < 0)
4473 options->rename_limit = diff_rename_limit_default;
4474 if (options->setup & DIFF_SETUP_USE_CACHE) {
4475 if (!active_cache)
4476 /* read-cache does not die even when it fails
4477 * so it is safe for us to do this here. Also
4478 * it does not smudge active_cache or active_nr
4479 * when it fails, so we do not have to worry about
4480 * cleaning it up ourselves either.
4481 */
4482 read_cache();
4483 }
4484 if (hexsz < options->abbrev)
4485 options->abbrev = hexsz; /* full */
4486
4487 /*
4488 * It does not make sense to show the first hit we happened
4489 * to have found. It does not make sense not to return with
4490 * exit code in such a case either.
4491 */
4492 if (options->flags.quick) {
4493 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4494 options->flags.exit_with_status = 1;
4495 }
4496
4497 options->diff_path_counter = 0;
4498
4499 if (options->flags.follow_renames && options->pathspec.nr != 1)
4500 die(_("--follow requires exactly one pathspec"));
4501
4502 if (!options->use_color || external_diff())
4503 options->color_moved = 0;
4504 }
4505
4506 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4507 {
4508 char c, *eq;
4509 int len;
4510
4511 if (*arg != '-')
4512 return 0;
4513 c = *++arg;
4514 if (!c)
4515 return 0;
4516 if (c == arg_short) {
4517 c = *++arg;
4518 if (!c)
4519 return 1;
4520 if (val && isdigit(c)) {
4521 char *end;
4522 int n = strtoul(arg, &end, 10);
4523 if (*end)
4524 return 0;
4525 *val = n;
4526 return 1;
4527 }
4528 return 0;
4529 }
4530 if (c != '-')
4531 return 0;
4532 arg++;
4533 eq = strchrnul(arg, '=');
4534 len = eq - arg;
4535 if (!len || strncmp(arg, arg_long, len))
4536 return 0;
4537 if (*eq) {
4538 int n;
4539 char *end;
4540 if (!isdigit(*++eq))
4541 return 0;
4542 n = strtoul(eq, &end, 10);
4543 if (*end)
4544 return 0;
4545 *val = n;
4546 }
4547 return 1;
4548 }
4549
4550 static int diff_scoreopt_parse(const char *opt);
4551
4552 static inline int short_opt(char opt, const char **argv,
4553 const char **optarg)
4554 {
4555 const char *arg = argv[0];
4556 if (arg[0] != '-' || arg[1] != opt)
4557 return 0;
4558 if (arg[2] != '\0') {
4559 *optarg = arg + 2;
4560 return 1;
4561 }
4562 if (!argv[1])
4563 die("Option '%c' requires a value", opt);
4564 *optarg = argv[1];
4565 return 2;
4566 }
4567
4568 int parse_long_opt(const char *opt, const char **argv,
4569 const char **optarg)
4570 {
4571 const char *arg = argv[0];
4572 if (!skip_prefix(arg, "--", &arg))
4573 return 0;
4574 if (!skip_prefix(arg, opt, &arg))
4575 return 0;
4576 if (*arg == '=') { /* stuck form: --option=value */
4577 *optarg = arg + 1;
4578 return 1;
4579 }
4580 if (*arg != '\0')
4581 return 0;
4582 /* separate form: --option value */
4583 if (!argv[1])
4584 die("Option '--%s' requires a value", opt);
4585 *optarg = argv[1];
4586 return 2;
4587 }
4588
4589 static int stat_opt(struct diff_options *options, const char **av)
4590 {
4591 const char *arg = av[0];
4592 char *end;
4593 int width = options->stat_width;
4594 int name_width = options->stat_name_width;
4595 int graph_width = options->stat_graph_width;
4596 int count = options->stat_count;
4597 int argcount = 1;
4598
4599 if (!skip_prefix(arg, "--stat", &arg))
4600 BUG("stat option does not begin with --stat: %s", arg);
4601 end = (char *)arg;
4602
4603 switch (*arg) {
4604 case '-':
4605 if (skip_prefix(arg, "-width", &arg)) {
4606 if (*arg == '=')
4607 width = strtoul(arg + 1, &end, 10);
4608 else if (!*arg && !av[1])
4609 die_want_option("--stat-width");
4610 else if (!*arg) {
4611 width = strtoul(av[1], &end, 10);
4612 argcount = 2;
4613 }
4614 } else if (skip_prefix(arg, "-name-width", &arg)) {
4615 if (*arg == '=')
4616 name_width = strtoul(arg + 1, &end, 10);
4617 else if (!*arg && !av[1])
4618 die_want_option("--stat-name-width");
4619 else if (!*arg) {
4620 name_width = strtoul(av[1], &end, 10);
4621 argcount = 2;
4622 }
4623 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4624 if (*arg == '=')
4625 graph_width = strtoul(arg + 1, &end, 10);
4626 else if (!*arg && !av[1])
4627 die_want_option("--stat-graph-width");
4628 else if (!*arg) {
4629 graph_width = strtoul(av[1], &end, 10);
4630 argcount = 2;
4631 }
4632 } else if (skip_prefix(arg, "-count", &arg)) {
4633 if (*arg == '=')
4634 count = strtoul(arg + 1, &end, 10);
4635 else if (!*arg && !av[1])
4636 die_want_option("--stat-count");
4637 else if (!*arg) {
4638 count = strtoul(av[1], &end, 10);
4639 argcount = 2;
4640 }
4641 }
4642 break;
4643 case '=':
4644 width = strtoul(arg+1, &end, 10);
4645 if (*end == ',')
4646 name_width = strtoul(end+1, &end, 10);
4647 if (*end == ',')
4648 count = strtoul(end+1, &end, 10);
4649 }
4650
4651 /* Important! This checks all the error cases! */
4652 if (*end)
4653 return 0;
4654 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4655 options->stat_name_width = name_width;
4656 options->stat_graph_width = graph_width;
4657 options->stat_width = width;
4658 options->stat_count = count;
4659 return argcount;
4660 }
4661
4662 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4663 {
4664 struct strbuf errmsg = STRBUF_INIT;
4665 if (parse_dirstat_params(options, params, &errmsg))
4666 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4667 errmsg.buf);
4668 strbuf_release(&errmsg);
4669 /*
4670 * The caller knows a dirstat-related option is given from the command
4671 * line; allow it to say "return this_function();"
4672 */
4673 options->output_format |= DIFF_FORMAT_DIRSTAT;
4674 return 1;
4675 }
4676
4677 static int parse_submodule_opt(struct diff_options *options, const char *value)
4678 {
4679 if (parse_submodule_params(options, value))
4680 die(_("Failed to parse --submodule option parameter: '%s'"),
4681 value);
4682 return 1;
4683 }
4684
4685 static const char diff_status_letters[] = {
4686 DIFF_STATUS_ADDED,
4687 DIFF_STATUS_COPIED,
4688 DIFF_STATUS_DELETED,
4689 DIFF_STATUS_MODIFIED,
4690 DIFF_STATUS_RENAMED,
4691 DIFF_STATUS_TYPE_CHANGED,
4692 DIFF_STATUS_UNKNOWN,
4693 DIFF_STATUS_UNMERGED,
4694 DIFF_STATUS_FILTER_AON,
4695 DIFF_STATUS_FILTER_BROKEN,
4696 '\0',
4697 };
4698
4699 static unsigned int filter_bit['Z' + 1];
4700
4701 static void prepare_filter_bits(void)
4702 {
4703 int i;
4704
4705 if (!filter_bit[DIFF_STATUS_ADDED]) {
4706 for (i = 0; diff_status_letters[i]; i++)
4707 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4708 }
4709 }
4710
4711 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4712 {
4713 return opt->filter & filter_bit[(int) status];
4714 }
4715
4716 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4717 {
4718 int i, optch;
4719
4720 prepare_filter_bits();
4721
4722 /*
4723 * If there is a negation e.g. 'd' in the input, and we haven't
4724 * initialized the filter field with another --diff-filter, start
4725 * from full set of bits, except for AON.
4726 */
4727 if (!opt->filter) {
4728 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4729 if (optch < 'a' || 'z' < optch)
4730 continue;
4731 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4732 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4733 break;
4734 }
4735 }
4736
4737 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4738 unsigned int bit;
4739 int negate;
4740
4741 if ('a' <= optch && optch <= 'z') {
4742 negate = 1;
4743 optch = toupper(optch);
4744 } else {
4745 negate = 0;
4746 }
4747
4748 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4749 if (!bit)
4750 return optarg[i];
4751 if (negate)
4752 opt->filter &= ~bit;
4753 else
4754 opt->filter |= bit;
4755 }
4756 return 0;
4757 }
4758
4759 static void enable_patch_output(int *fmt) {
4760 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4761 *fmt |= DIFF_FORMAT_PATCH;
4762 }
4763
4764 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4765 {
4766 int val = parse_ws_error_highlight(arg);
4767
4768 if (val < 0) {
4769 error("unknown value after ws-error-highlight=%.*s",
4770 -1 - val, arg);
4771 return 0;
4772 }
4773 opt->ws_error_highlight = val;
4774 return 1;
4775 }
4776
4777 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4778 {
4779 struct object_id oid;
4780
4781 if (get_oid(arg, &oid))
4782 return error("unable to resolve '%s'", arg);
4783
4784 if (!opt->objfind)
4785 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4786
4787 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4788 opt->flags.recursive = 1;
4789 opt->flags.tree_in_recursive = 1;
4790 oidset_insert(opt->objfind, &oid);
4791 return 1;
4792 }
4793
4794 int diff_opt_parse(struct diff_options *options,
4795 const char **av, int ac, const char *prefix)
4796 {
4797 const char *arg = av[0];
4798 const char *optarg;
4799 int argcount;
4800
4801 if (!prefix)
4802 prefix = "";
4803
4804 /* Output format options */
4805 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4806 || opt_arg(arg, 'U', "unified", &options->context))
4807 enable_patch_output(&options->output_format);
4808 else if (!strcmp(arg, "--raw"))
4809 options->output_format |= DIFF_FORMAT_RAW;
4810 else if (!strcmp(arg, "--patch-with-raw")) {
4811 enable_patch_output(&options->output_format);
4812 options->output_format |= DIFF_FORMAT_RAW;
4813 } else if (!strcmp(arg, "--numstat"))
4814 options->output_format |= DIFF_FORMAT_NUMSTAT;
4815 else if (!strcmp(arg, "--shortstat"))
4816 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4817 else if (skip_prefix(arg, "-X", &arg) ||
4818 skip_to_optional_arg(arg, "--dirstat", &arg))
4819 return parse_dirstat_opt(options, arg);
4820 else if (!strcmp(arg, "--cumulative"))
4821 return parse_dirstat_opt(options, "cumulative");
4822 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4823 parse_dirstat_opt(options, "files");
4824 return parse_dirstat_opt(options, arg);
4825 }
4826 else if (!strcmp(arg, "--check"))
4827 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4828 else if (!strcmp(arg, "--summary"))
4829 options->output_format |= DIFF_FORMAT_SUMMARY;
4830 else if (!strcmp(arg, "--patch-with-stat")) {
4831 enable_patch_output(&options->output_format);
4832 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4833 } else if (!strcmp(arg, "--name-only"))
4834 options->output_format |= DIFF_FORMAT_NAME;
4835 else if (!strcmp(arg, "--name-status"))
4836 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4837 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4838 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4839 else if (starts_with(arg, "--stat"))
4840 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4841 return stat_opt(options, av);
4842 else if (!strcmp(arg, "--compact-summary")) {
4843 options->flags.stat_with_summary = 1;
4844 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4845 } else if (!strcmp(arg, "--no-compact-summary"))
4846 options->flags.stat_with_summary = 0;
4847
4848 /* renames options */
4849 else if (starts_with(arg, "-B") ||
4850 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4851 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4852 return error("invalid argument to -B: %s", arg+2);
4853 }
4854 else if (starts_with(arg, "-M") ||
4855 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4856 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4857 return error("invalid argument to -M: %s", arg+2);
4858 options->detect_rename = DIFF_DETECT_RENAME;
4859 }
4860 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4861 options->irreversible_delete = 1;
4862 }
4863 else if (starts_with(arg, "-C") ||
4864 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4865 if (options->detect_rename == DIFF_DETECT_COPY)
4866 options->flags.find_copies_harder = 1;
4867 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4868 return error("invalid argument to -C: %s", arg+2);
4869 options->detect_rename = DIFF_DETECT_COPY;
4870 }
4871 else if (!strcmp(arg, "--no-renames"))
4872 options->detect_rename = 0;
4873 else if (!strcmp(arg, "--rename-empty"))
4874 options->flags.rename_empty = 1;
4875 else if (!strcmp(arg, "--no-rename-empty"))
4876 options->flags.rename_empty = 0;
4877 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4878 options->flags.relative_name = 1;
4879 if (arg)
4880 options->prefix = arg;
4881 }
4882
4883 /* xdiff options */
4884 else if (!strcmp(arg, "--minimal"))
4885 DIFF_XDL_SET(options, NEED_MINIMAL);
4886 else if (!strcmp(arg, "--no-minimal"))
4887 DIFF_XDL_CLR(options, NEED_MINIMAL);
4888 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4889 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4890 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4891 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4892 else if (!strcmp(arg, "--ignore-space-at-eol"))
4893 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4894 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4895 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4896 else if (!strcmp(arg, "--ignore-blank-lines"))
4897 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4898 else if (!strcmp(arg, "--indent-heuristic"))
4899 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4900 else if (!strcmp(arg, "--no-indent-heuristic"))
4901 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4902 else if (!strcmp(arg, "--patience")) {
4903 int i;
4904 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4905 /*
4906 * Both --patience and --anchored use PATIENCE_DIFF
4907 * internally, so remove any anchors previously
4908 * specified.
4909 */
4910 for (i = 0; i < options->anchors_nr; i++)
4911 free(options->anchors[i]);
4912 options->anchors_nr = 0;
4913 } else if (!strcmp(arg, "--histogram"))
4914 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4915 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4916 long value = parse_algorithm_value(optarg);
4917 if (value < 0)
4918 return error("option diff-algorithm accepts \"myers\", "
4919 "\"minimal\", \"patience\" and \"histogram\"");
4920 /* clear out previous settings */
4921 DIFF_XDL_CLR(options, NEED_MINIMAL);
4922 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4923 options->xdl_opts |= value;
4924 return argcount;
4925 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4926 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4927 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4928 options->anchors_alloc);
4929 options->anchors[options->anchors_nr++] = xstrdup(arg);
4930 }
4931
4932 /* flags options */
4933 else if (!strcmp(arg, "--binary")) {
4934 enable_patch_output(&options->output_format);
4935 options->flags.binary = 1;
4936 }
4937 else if (!strcmp(arg, "--full-index"))
4938 options->flags.full_index = 1;
4939 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4940 options->flags.text = 1;
4941 else if (!strcmp(arg, "-R"))
4942 options->flags.reverse_diff = 1;
4943 else if (!strcmp(arg, "--find-copies-harder"))
4944 options->flags.find_copies_harder = 1;
4945 else if (!strcmp(arg, "--follow"))
4946 options->flags.follow_renames = 1;
4947 else if (!strcmp(arg, "--no-follow")) {
4948 options->flags.follow_renames = 0;
4949 options->flags.default_follow_renames = 0;
4950 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
4951 int value = git_config_colorbool(NULL, arg);
4952 if (value < 0)
4953 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4954 options->use_color = value;
4955 }
4956 else if (!strcmp(arg, "--no-color"))
4957 options->use_color = 0;
4958 else if (!strcmp(arg, "--color-moved")) {
4959 if (diff_color_moved_default)
4960 options->color_moved = diff_color_moved_default;
4961 if (options->color_moved == COLOR_MOVED_NO)
4962 options->color_moved = COLOR_MOVED_DEFAULT;
4963 } else if (!strcmp(arg, "--no-color-moved"))
4964 options->color_moved = COLOR_MOVED_NO;
4965 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4966 int cm = parse_color_moved(arg);
4967 if (cm < 0)
4968 die("bad --color-moved argument: %s", arg);
4969 options->color_moved = cm;
4970 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
4971 options->color_moved_ws_handling = parse_color_moved_ws(arg);
4972 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
4973 options->use_color = 1;
4974 options->word_diff = DIFF_WORDS_COLOR;
4975 }
4976 else if (!strcmp(arg, "--word-diff")) {
4977 if (options->word_diff == DIFF_WORDS_NONE)
4978 options->word_diff = DIFF_WORDS_PLAIN;
4979 }
4980 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4981 if (!strcmp(arg, "plain"))
4982 options->word_diff = DIFF_WORDS_PLAIN;
4983 else if (!strcmp(arg, "color")) {
4984 options->use_color = 1;
4985 options->word_diff = DIFF_WORDS_COLOR;
4986 }
4987 else if (!strcmp(arg, "porcelain"))
4988 options->word_diff = DIFF_WORDS_PORCELAIN;
4989 else if (!strcmp(arg, "none"))
4990 options->word_diff = DIFF_WORDS_NONE;
4991 else
4992 die("bad --word-diff argument: %s", arg);
4993 }
4994 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
4995 if (options->word_diff == DIFF_WORDS_NONE)
4996 options->word_diff = DIFF_WORDS_PLAIN;
4997 options->word_regex = optarg;
4998 return argcount;
4999 }
5000 else if (!strcmp(arg, "--exit-code"))
5001 options->flags.exit_with_status = 1;
5002 else if (!strcmp(arg, "--quiet"))
5003 options->flags.quick = 1;
5004 else if (!strcmp(arg, "--ext-diff"))
5005 options->flags.allow_external = 1;
5006 else if (!strcmp(arg, "--no-ext-diff"))
5007 options->flags.allow_external = 0;
5008 else if (!strcmp(arg, "--textconv")) {
5009 options->flags.allow_textconv = 1;
5010 options->flags.textconv_set_via_cmdline = 1;
5011 } else if (!strcmp(arg, "--no-textconv"))
5012 options->flags.allow_textconv = 0;
5013 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5014 options->flags.override_submodule_config = 1;
5015 handle_ignore_submodules_arg(options, arg);
5016 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5017 return parse_submodule_opt(options, arg);
5018 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5019 return parse_ws_error_highlight_opt(options, arg);
5020 else if (!strcmp(arg, "--ita-invisible-in-index"))
5021 options->ita_invisible_in_index = 1;
5022 else if (!strcmp(arg, "--ita-visible-in-index"))
5023 options->ita_invisible_in_index = 0;
5024
5025 /* misc options */
5026 else if (!strcmp(arg, "-z"))
5027 options->line_termination = 0;
5028 else if ((argcount = short_opt('l', av, &optarg))) {
5029 options->rename_limit = strtoul(optarg, NULL, 10);
5030 return argcount;
5031 }
5032 else if ((argcount = short_opt('S', av, &optarg))) {
5033 options->pickaxe = optarg;
5034 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5035 return argcount;
5036 } else if ((argcount = short_opt('G', av, &optarg))) {
5037 options->pickaxe = optarg;
5038 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5039 return argcount;
5040 }
5041 else if (!strcmp(arg, "--pickaxe-all"))
5042 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5043 else if (!strcmp(arg, "--pickaxe-regex"))
5044 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5045 else if ((argcount = short_opt('O', av, &optarg))) {
5046 options->orderfile = prefix_filename(prefix, optarg);
5047 return argcount;
5048 } else if (skip_prefix(arg, "--find-object=", &arg))
5049 return parse_objfind_opt(options, arg);
5050 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5051 int offending = parse_diff_filter_opt(optarg, options);
5052 if (offending)
5053 die("unknown change class '%c' in --diff-filter=%s",
5054 offending, optarg);
5055 return argcount;
5056 }
5057 else if (!strcmp(arg, "--no-abbrev"))
5058 options->abbrev = 0;
5059 else if (!strcmp(arg, "--abbrev"))
5060 options->abbrev = DEFAULT_ABBREV;
5061 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5062 options->abbrev = strtoul(arg, NULL, 10);
5063 if (options->abbrev < MINIMUM_ABBREV)
5064 options->abbrev = MINIMUM_ABBREV;
5065 else if (the_hash_algo->hexsz < options->abbrev)
5066 options->abbrev = the_hash_algo->hexsz;
5067 }
5068 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5069 options->a_prefix = optarg;
5070 return argcount;
5071 }
5072 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5073 options->line_prefix = optarg;
5074 options->line_prefix_length = strlen(options->line_prefix);
5075 graph_setup_line_prefix(options);
5076 return argcount;
5077 }
5078 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5079 options->b_prefix = optarg;
5080 return argcount;
5081 }
5082 else if (!strcmp(arg, "--no-prefix"))
5083 options->a_prefix = options->b_prefix = "";
5084 else if (opt_arg(arg, '\0', "inter-hunk-context",
5085 &options->interhunkcontext))
5086 ;
5087 else if (!strcmp(arg, "-W"))
5088 options->flags.funccontext = 1;
5089 else if (!strcmp(arg, "--function-context"))
5090 options->flags.funccontext = 1;
5091 else if (!strcmp(arg, "--no-function-context"))
5092 options->flags.funccontext = 0;
5093 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5094 char *path = prefix_filename(prefix, optarg);
5095 options->file = xfopen(path, "w");
5096 options->close_file = 1;
5097 if (options->use_color != GIT_COLOR_ALWAYS)
5098 options->use_color = GIT_COLOR_NEVER;
5099 free(path);
5100 return argcount;
5101 } else
5102 return 0;
5103 return 1;
5104 }
5105
5106 int parse_rename_score(const char **cp_p)
5107 {
5108 unsigned long num, scale;
5109 int ch, dot;
5110 const char *cp = *cp_p;
5111
5112 num = 0;
5113 scale = 1;
5114 dot = 0;
5115 for (;;) {
5116 ch = *cp;
5117 if ( !dot && ch == '.' ) {
5118 scale = 1;
5119 dot = 1;
5120 } else if ( ch == '%' ) {
5121 scale = dot ? scale*100 : 100;
5122 cp++; /* % is always at the end */
5123 break;
5124 } else if ( ch >= '0' && ch <= '9' ) {
5125 if ( scale < 100000 ) {
5126 scale *= 10;
5127 num = (num*10) + (ch-'0');
5128 }
5129 } else {
5130 break;
5131 }
5132 cp++;
5133 }
5134 *cp_p = cp;
5135
5136 /* user says num divided by scale and we say internally that
5137 * is MAX_SCORE * num / scale.
5138 */
5139 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5140 }
5141
5142 static int diff_scoreopt_parse(const char *opt)
5143 {
5144 int opt1, opt2, cmd;
5145
5146 if (*opt++ != '-')
5147 return -1;
5148 cmd = *opt++;
5149 if (cmd == '-') {
5150 /* convert the long-form arguments into short-form versions */
5151 if (skip_prefix(opt, "break-rewrites", &opt)) {
5152 if (*opt == 0 || *opt++ == '=')
5153 cmd = 'B';
5154 } else if (skip_prefix(opt, "find-copies", &opt)) {
5155 if (*opt == 0 || *opt++ == '=')
5156 cmd = 'C';
5157 } else if (skip_prefix(opt, "find-renames", &opt)) {
5158 if (*opt == 0 || *opt++ == '=')
5159 cmd = 'M';
5160 }
5161 }
5162 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5163 return -1; /* that is not a -M, -C, or -B option */
5164
5165 opt1 = parse_rename_score(&opt);
5166 if (cmd != 'B')
5167 opt2 = 0;
5168 else {
5169 if (*opt == 0)
5170 opt2 = 0;
5171 else if (*opt != '/')
5172 return -1; /* we expect -B80/99 or -B80 */
5173 else {
5174 opt++;
5175 opt2 = parse_rename_score(&opt);
5176 }
5177 }
5178 if (*opt != 0)
5179 return -1;
5180 return opt1 | (opt2 << 16);
5181 }
5182
5183 struct diff_queue_struct diff_queued_diff;
5184
5185 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5186 {
5187 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5188 queue->queue[queue->nr++] = dp;
5189 }
5190
5191 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5192 struct diff_filespec *one,
5193 struct diff_filespec *two)
5194 {
5195 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5196 dp->one = one;
5197 dp->two = two;
5198 if (queue)
5199 diff_q(queue, dp);
5200 return dp;
5201 }
5202
5203 void diff_free_filepair(struct diff_filepair *p)
5204 {
5205 free_filespec(p->one);
5206 free_filespec(p->two);
5207 free(p);
5208 }
5209
5210 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5211 {
5212 int abblen;
5213 const char *abbrev;
5214
5215 /* Do we want all 40 hex characters? */
5216 if (len == the_hash_algo->hexsz)
5217 return oid_to_hex(oid);
5218
5219 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5220 abbrev = diff_abbrev_oid(oid, len);
5221
5222 if (!print_sha1_ellipsis())
5223 return abbrev;
5224
5225 abblen = strlen(abbrev);
5226
5227 /*
5228 * In well-behaved cases, where the abbreviated result is the
5229 * same as the requested length, append three dots after the
5230 * abbreviation (hence the whole logic is limited to the case
5231 * where abblen < 37); when the actual abbreviated result is a
5232 * bit longer than the requested length, we reduce the number
5233 * of dots so that they match the well-behaved ones. However,
5234 * if the actual abbreviation is longer than the requested
5235 * length by more than three, we give up on aligning, and add
5236 * three dots anyway, to indicate that the output is not the
5237 * full object name. Yes, this may be suboptimal, but this
5238 * appears only in "diff --raw --abbrev" output and it is not
5239 * worth the effort to change it now. Note that this would
5240 * likely to work fine when the automatic sizing of default
5241 * abbreviation length is used--we would be fed -1 in "len" in
5242 * that case, and will end up always appending three-dots, but
5243 * the automatic sizing is supposed to give abblen that ensures
5244 * uniqueness across all objects (statistically speaking).
5245 */
5246 if (abblen < the_hash_algo->hexsz - 3) {
5247 static char hex[GIT_MAX_HEXSZ + 1];
5248 if (len < abblen && abblen <= len + 2)
5249 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5250 else
5251 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5252 return hex;
5253 }
5254
5255 return oid_to_hex(oid);
5256 }
5257
5258 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5259 {
5260 int line_termination = opt->line_termination;
5261 int inter_name_termination = line_termination ? '\t' : '\0';
5262
5263 fprintf(opt->file, "%s", diff_line_prefix(opt));
5264 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5265 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5266 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5267 fprintf(opt->file, "%s ",
5268 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5269 }
5270 if (p->score) {
5271 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5272 inter_name_termination);
5273 } else {
5274 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5275 }
5276
5277 if (p->status == DIFF_STATUS_COPIED ||
5278 p->status == DIFF_STATUS_RENAMED) {
5279 const char *name_a, *name_b;
5280 name_a = p->one->path;
5281 name_b = p->two->path;
5282 strip_prefix(opt->prefix_length, &name_a, &name_b);
5283 write_name_quoted(name_a, opt->file, inter_name_termination);
5284 write_name_quoted(name_b, opt->file, line_termination);
5285 } else {
5286 const char *name_a, *name_b;
5287 name_a = p->one->mode ? p->one->path : p->two->path;
5288 name_b = NULL;
5289 strip_prefix(opt->prefix_length, &name_a, &name_b);
5290 write_name_quoted(name_a, opt->file, line_termination);
5291 }
5292 }
5293
5294 int diff_unmodified_pair(struct diff_filepair *p)
5295 {
5296 /* This function is written stricter than necessary to support
5297 * the currently implemented transformers, but the idea is to
5298 * let transformers to produce diff_filepairs any way they want,
5299 * and filter and clean them up here before producing the output.
5300 */
5301 struct diff_filespec *one = p->one, *two = p->two;
5302
5303 if (DIFF_PAIR_UNMERGED(p))
5304 return 0; /* unmerged is interesting */
5305
5306 /* deletion, addition, mode or type change
5307 * and rename are all interesting.
5308 */
5309 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5310 DIFF_PAIR_MODE_CHANGED(p) ||
5311 strcmp(one->path, two->path))
5312 return 0;
5313
5314 /* both are valid and point at the same path. that is, we are
5315 * dealing with a change.
5316 */
5317 if (one->oid_valid && two->oid_valid &&
5318 !oidcmp(&one->oid, &two->oid) &&
5319 !one->dirty_submodule && !two->dirty_submodule)
5320 return 1; /* no change */
5321 if (!one->oid_valid && !two->oid_valid)
5322 return 1; /* both look at the same file on the filesystem. */
5323 return 0;
5324 }
5325
5326 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5327 {
5328 if (diff_unmodified_pair(p))
5329 return;
5330
5331 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5332 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5333 return; /* no tree diffs in patch format */
5334
5335 run_diff(p, o);
5336 }
5337
5338 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5339 struct diffstat_t *diffstat)
5340 {
5341 if (diff_unmodified_pair(p))
5342 return;
5343
5344 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5345 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5346 return; /* no useful stat for tree diffs */
5347
5348 run_diffstat(p, o, diffstat);
5349 }
5350
5351 static void diff_flush_checkdiff(struct diff_filepair *p,
5352 struct diff_options *o)
5353 {
5354 if (diff_unmodified_pair(p))
5355 return;
5356
5357 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5358 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5359 return; /* nothing to check in tree diffs */
5360
5361 run_checkdiff(p, o);
5362 }
5363
5364 int diff_queue_is_empty(void)
5365 {
5366 struct diff_queue_struct *q = &diff_queued_diff;
5367 int i;
5368 for (i = 0; i < q->nr; i++)
5369 if (!diff_unmodified_pair(q->queue[i]))
5370 return 0;
5371 return 1;
5372 }
5373
5374 #if DIFF_DEBUG
5375 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5376 {
5377 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5378 x, one ? one : "",
5379 s->path,
5380 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5381 s->mode,
5382 s->oid_valid ? oid_to_hex(&s->oid) : "");
5383 fprintf(stderr, "queue[%d] %s size %lu\n",
5384 x, one ? one : "",
5385 s->size);
5386 }
5387
5388 void diff_debug_filepair(const struct diff_filepair *p, int i)
5389 {
5390 diff_debug_filespec(p->one, i, "one");
5391 diff_debug_filespec(p->two, i, "two");
5392 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5393 p->score, p->status ? p->status : '?',
5394 p->one->rename_used, p->broken_pair);
5395 }
5396
5397 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5398 {
5399 int i;
5400 if (msg)
5401 fprintf(stderr, "%s\n", msg);
5402 fprintf(stderr, "q->nr = %d\n", q->nr);
5403 for (i = 0; i < q->nr; i++) {
5404 struct diff_filepair *p = q->queue[i];
5405 diff_debug_filepair(p, i);
5406 }
5407 }
5408 #endif
5409
5410 static void diff_resolve_rename_copy(void)
5411 {
5412 int i;
5413 struct diff_filepair *p;
5414 struct diff_queue_struct *q = &diff_queued_diff;
5415
5416 diff_debug_queue("resolve-rename-copy", q);
5417
5418 for (i = 0; i < q->nr; i++) {
5419 p = q->queue[i];
5420 p->status = 0; /* undecided */
5421 if (DIFF_PAIR_UNMERGED(p))
5422 p->status = DIFF_STATUS_UNMERGED;
5423 else if (!DIFF_FILE_VALID(p->one))
5424 p->status = DIFF_STATUS_ADDED;
5425 else if (!DIFF_FILE_VALID(p->two))
5426 p->status = DIFF_STATUS_DELETED;
5427 else if (DIFF_PAIR_TYPE_CHANGED(p))
5428 p->status = DIFF_STATUS_TYPE_CHANGED;
5429
5430 /* from this point on, we are dealing with a pair
5431 * whose both sides are valid and of the same type, i.e.
5432 * either in-place edit or rename/copy edit.
5433 */
5434 else if (DIFF_PAIR_RENAME(p)) {
5435 /*
5436 * A rename might have re-connected a broken
5437 * pair up, causing the pathnames to be the
5438 * same again. If so, that's not a rename at
5439 * all, just a modification..
5440 *
5441 * Otherwise, see if this source was used for
5442 * multiple renames, in which case we decrement
5443 * the count, and call it a copy.
5444 */
5445 if (!strcmp(p->one->path, p->two->path))
5446 p->status = DIFF_STATUS_MODIFIED;
5447 else if (--p->one->rename_used > 0)
5448 p->status = DIFF_STATUS_COPIED;
5449 else
5450 p->status = DIFF_STATUS_RENAMED;
5451 }
5452 else if (oidcmp(&p->one->oid, &p->two->oid) ||
5453 p->one->mode != p->two->mode ||
5454 p->one->dirty_submodule ||
5455 p->two->dirty_submodule ||
5456 is_null_oid(&p->one->oid))
5457 p->status = DIFF_STATUS_MODIFIED;
5458 else {
5459 /* This is a "no-change" entry and should not
5460 * happen anymore, but prepare for broken callers.
5461 */
5462 error("feeding unmodified %s to diffcore",
5463 p->one->path);
5464 p->status = DIFF_STATUS_UNKNOWN;
5465 }
5466 }
5467 diff_debug_queue("resolve-rename-copy done", q);
5468 }
5469
5470 static int check_pair_status(struct diff_filepair *p)
5471 {
5472 switch (p->status) {
5473 case DIFF_STATUS_UNKNOWN:
5474 return 0;
5475 case 0:
5476 die("internal error in diff-resolve-rename-copy");
5477 default:
5478 return 1;
5479 }
5480 }
5481
5482 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5483 {
5484 int fmt = opt->output_format;
5485
5486 if (fmt & DIFF_FORMAT_CHECKDIFF)
5487 diff_flush_checkdiff(p, opt);
5488 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5489 diff_flush_raw(p, opt);
5490 else if (fmt & DIFF_FORMAT_NAME) {
5491 const char *name_a, *name_b;
5492 name_a = p->two->path;
5493 name_b = NULL;
5494 strip_prefix(opt->prefix_length, &name_a, &name_b);
5495 fprintf(opt->file, "%s", diff_line_prefix(opt));
5496 write_name_quoted(name_a, opt->file, opt->line_termination);
5497 }
5498 }
5499
5500 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5501 {
5502 struct strbuf sb = STRBUF_INIT;
5503 if (fs->mode)
5504 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5505 else
5506 strbuf_addf(&sb, " %s ", newdelete);
5507
5508 quote_c_style(fs->path, &sb, NULL, 0);
5509 strbuf_addch(&sb, '\n');
5510 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5511 sb.buf, sb.len, 0);
5512 strbuf_release(&sb);
5513 }
5514
5515 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5516 int show_name)
5517 {
5518 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5519 struct strbuf sb = STRBUF_INIT;
5520 strbuf_addf(&sb, " mode change %06o => %06o",
5521 p->one->mode, p->two->mode);
5522 if (show_name) {
5523 strbuf_addch(&sb, ' ');
5524 quote_c_style(p->two->path, &sb, NULL, 0);
5525 }
5526 strbuf_addch(&sb, '\n');
5527 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5528 sb.buf, sb.len, 0);
5529 strbuf_release(&sb);
5530 }
5531 }
5532
5533 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5534 struct diff_filepair *p)
5535 {
5536 struct strbuf sb = STRBUF_INIT;
5537 struct strbuf names = STRBUF_INIT;
5538
5539 pprint_rename(&names, p->one->path, p->two->path);
5540 strbuf_addf(&sb, " %s %s (%d%%)\n",
5541 renamecopy, names.buf, similarity_index(p));
5542 strbuf_release(&names);
5543 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5544 sb.buf, sb.len, 0);
5545 show_mode_change(opt, p, 0);
5546 strbuf_release(&sb);
5547 }
5548
5549 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5550 {
5551 switch(p->status) {
5552 case DIFF_STATUS_DELETED:
5553 show_file_mode_name(opt, "delete", p->one);
5554 break;
5555 case DIFF_STATUS_ADDED:
5556 show_file_mode_name(opt, "create", p->two);
5557 break;
5558 case DIFF_STATUS_COPIED:
5559 show_rename_copy(opt, "copy", p);
5560 break;
5561 case DIFF_STATUS_RENAMED:
5562 show_rename_copy(opt, "rename", p);
5563 break;
5564 default:
5565 if (p->score) {
5566 struct strbuf sb = STRBUF_INIT;
5567 strbuf_addstr(&sb, " rewrite ");
5568 quote_c_style(p->two->path, &sb, NULL, 0);
5569 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5570 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5571 sb.buf, sb.len, 0);
5572 strbuf_release(&sb);
5573 }
5574 show_mode_change(opt, p, !p->score);
5575 break;
5576 }
5577 }
5578
5579 struct patch_id_t {
5580 git_SHA_CTX *ctx;
5581 int patchlen;
5582 };
5583
5584 static int remove_space(char *line, int len)
5585 {
5586 int i;
5587 char *dst = line;
5588 unsigned char c;
5589
5590 for (i = 0; i < len; i++)
5591 if (!isspace((c = line[i])))
5592 *dst++ = c;
5593
5594 return dst - line;
5595 }
5596
5597 static void patch_id_consume(void *priv, char *line, unsigned long len)
5598 {
5599 struct patch_id_t *data = priv;
5600 int new_len;
5601
5602 /* Ignore line numbers when computing the SHA1 of the patch */
5603 if (starts_with(line, "@@ -"))
5604 return;
5605
5606 new_len = remove_space(line, len);
5607
5608 git_SHA1_Update(data->ctx, line, new_len);
5609 data->patchlen += new_len;
5610 }
5611
5612 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5613 {
5614 git_SHA1_Update(ctx, str, strlen(str));
5615 }
5616
5617 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5618 {
5619 /* large enough for 2^32 in octal */
5620 char buf[12];
5621 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5622 git_SHA1_Update(ctx, buf, len);
5623 }
5624
5625 /* returns 0 upon success, and writes result into sha1 */
5626 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5627 {
5628 struct diff_queue_struct *q = &diff_queued_diff;
5629 int i;
5630 git_SHA_CTX ctx;
5631 struct patch_id_t data;
5632
5633 git_SHA1_Init(&ctx);
5634 memset(&data, 0, sizeof(struct patch_id_t));
5635 data.ctx = &ctx;
5636
5637 for (i = 0; i < q->nr; i++) {
5638 xpparam_t xpp;
5639 xdemitconf_t xecfg;
5640 mmfile_t mf1, mf2;
5641 struct diff_filepair *p = q->queue[i];
5642 int len1, len2;
5643
5644 memset(&xpp, 0, sizeof(xpp));
5645 memset(&xecfg, 0, sizeof(xecfg));
5646 if (p->status == 0)
5647 return error("internal diff status error");
5648 if (p->status == DIFF_STATUS_UNKNOWN)
5649 continue;
5650 if (diff_unmodified_pair(p))
5651 continue;
5652 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5653 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5654 continue;
5655 if (DIFF_PAIR_UNMERGED(p))
5656 continue;
5657
5658 diff_fill_oid_info(p->one);
5659 diff_fill_oid_info(p->two);
5660
5661 len1 = remove_space(p->one->path, strlen(p->one->path));
5662 len2 = remove_space(p->two->path, strlen(p->two->path));
5663 patch_id_add_string(&ctx, "diff--git");
5664 patch_id_add_string(&ctx, "a/");
5665 git_SHA1_Update(&ctx, p->one->path, len1);
5666 patch_id_add_string(&ctx, "b/");
5667 git_SHA1_Update(&ctx, p->two->path, len2);
5668
5669 if (p->one->mode == 0) {
5670 patch_id_add_string(&ctx, "newfilemode");
5671 patch_id_add_mode(&ctx, p->two->mode);
5672 patch_id_add_string(&ctx, "---/dev/null");
5673 patch_id_add_string(&ctx, "+++b/");
5674 git_SHA1_Update(&ctx, p->two->path, len2);
5675 } else if (p->two->mode == 0) {
5676 patch_id_add_string(&ctx, "deletedfilemode");
5677 patch_id_add_mode(&ctx, p->one->mode);
5678 patch_id_add_string(&ctx, "---a/");
5679 git_SHA1_Update(&ctx, p->one->path, len1);
5680 patch_id_add_string(&ctx, "+++/dev/null");
5681 } else {
5682 patch_id_add_string(&ctx, "---a/");
5683 git_SHA1_Update(&ctx, p->one->path, len1);
5684 patch_id_add_string(&ctx, "+++b/");
5685 git_SHA1_Update(&ctx, p->two->path, len2);
5686 }
5687
5688 if (diff_header_only)
5689 continue;
5690
5691 if (fill_mmfile(&mf1, p->one) < 0 ||
5692 fill_mmfile(&mf2, p->two) < 0)
5693 return error("unable to read files to diff");
5694
5695 if (diff_filespec_is_binary(p->one) ||
5696 diff_filespec_is_binary(p->two)) {
5697 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5698 GIT_SHA1_HEXSZ);
5699 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5700 GIT_SHA1_HEXSZ);
5701 continue;
5702 }
5703
5704 xpp.flags = 0;
5705 xecfg.ctxlen = 3;
5706 xecfg.flags = 0;
5707 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5708 &xpp, &xecfg))
5709 return error("unable to generate patch-id diff for %s",
5710 p->one->path);
5711 }
5712
5713 git_SHA1_Final(oid->hash, &ctx);
5714 return 0;
5715 }
5716
5717 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5718 {
5719 struct diff_queue_struct *q = &diff_queued_diff;
5720 int i;
5721 int result = diff_get_patch_id(options, oid, diff_header_only);
5722
5723 for (i = 0; i < q->nr; i++)
5724 diff_free_filepair(q->queue[i]);
5725
5726 free(q->queue);
5727 DIFF_QUEUE_CLEAR(q);
5728
5729 return result;
5730 }
5731
5732 static int is_summary_empty(const struct diff_queue_struct *q)
5733 {
5734 int i;
5735
5736 for (i = 0; i < q->nr; i++) {
5737 const struct diff_filepair *p = q->queue[i];
5738
5739 switch (p->status) {
5740 case DIFF_STATUS_DELETED:
5741 case DIFF_STATUS_ADDED:
5742 case DIFF_STATUS_COPIED:
5743 case DIFF_STATUS_RENAMED:
5744 return 0;
5745 default:
5746 if (p->score)
5747 return 0;
5748 if (p->one->mode && p->two->mode &&
5749 p->one->mode != p->two->mode)
5750 return 0;
5751 break;
5752 }
5753 }
5754 return 1;
5755 }
5756
5757 static const char rename_limit_warning[] =
5758 N_("inexact rename detection was skipped due to too many files.");
5759
5760 static const char degrade_cc_to_c_warning[] =
5761 N_("only found copies from modified paths due to too many files.");
5762
5763 static const char rename_limit_advice[] =
5764 N_("you may want to set your %s variable to at least "
5765 "%d and retry the command.");
5766
5767 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5768 {
5769 fflush(stdout);
5770 if (degraded_cc)
5771 warning(_(degrade_cc_to_c_warning));
5772 else if (needed)
5773 warning(_(rename_limit_warning));
5774 else
5775 return;
5776 if (0 < needed)
5777 warning(_(rename_limit_advice), varname, needed);
5778 }
5779
5780 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5781 {
5782 int i;
5783 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5784 struct diff_queue_struct *q = &diff_queued_diff;
5785
5786 if (WSEH_NEW & WS_RULE_MASK)
5787 BUG("WS rules bit mask overlaps with diff symbol flags");
5788
5789 if (o->color_moved)
5790 o->emitted_symbols = &esm;
5791
5792 for (i = 0; i < q->nr; i++) {
5793 struct diff_filepair *p = q->queue[i];
5794 if (check_pair_status(p))
5795 diff_flush_patch(p, o);
5796 }
5797
5798 if (o->emitted_symbols) {
5799 if (o->color_moved) {
5800 struct hashmap add_lines, del_lines;
5801
5802 if (o->color_moved_ws_handling &
5803 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5804 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5805
5806 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5807 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5808
5809 add_lines_to_move_detection(o, &add_lines, &del_lines);
5810 mark_color_as_moved(o, &add_lines, &del_lines);
5811 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5812 dim_moved_lines(o);
5813
5814 hashmap_free(&add_lines, 0);
5815 hashmap_free(&del_lines, 0);
5816 }
5817
5818 for (i = 0; i < esm.nr; i++)
5819 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5820
5821 for (i = 0; i < esm.nr; i++)
5822 free((void *)esm.buf[i].line);
5823 }
5824 esm.nr = 0;
5825 }
5826
5827 void diff_flush(struct diff_options *options)
5828 {
5829 struct diff_queue_struct *q = &diff_queued_diff;
5830 int i, output_format = options->output_format;
5831 int separator = 0;
5832 int dirstat_by_line = 0;
5833
5834 /*
5835 * Order: raw, stat, summary, patch
5836 * or: name/name-status/checkdiff (other bits clear)
5837 */
5838 if (!q->nr)
5839 goto free_queue;
5840
5841 if (output_format & (DIFF_FORMAT_RAW |
5842 DIFF_FORMAT_NAME |
5843 DIFF_FORMAT_NAME_STATUS |
5844 DIFF_FORMAT_CHECKDIFF)) {
5845 for (i = 0; i < q->nr; i++) {
5846 struct diff_filepair *p = q->queue[i];
5847 if (check_pair_status(p))
5848 flush_one_pair(p, options);
5849 }
5850 separator++;
5851 }
5852
5853 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5854 dirstat_by_line = 1;
5855
5856 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5857 dirstat_by_line) {
5858 struct diffstat_t diffstat;
5859
5860 memset(&diffstat, 0, sizeof(struct diffstat_t));
5861 for (i = 0; i < q->nr; i++) {
5862 struct diff_filepair *p = q->queue[i];
5863 if (check_pair_status(p))
5864 diff_flush_stat(p, options, &diffstat);
5865 }
5866 if (output_format & DIFF_FORMAT_NUMSTAT)
5867 show_numstat(&diffstat, options);
5868 if (output_format & DIFF_FORMAT_DIFFSTAT)
5869 show_stats(&diffstat, options);
5870 if (output_format & DIFF_FORMAT_SHORTSTAT)
5871 show_shortstats(&diffstat, options);
5872 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5873 show_dirstat_by_line(&diffstat, options);
5874 free_diffstat_info(&diffstat);
5875 separator++;
5876 }
5877 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5878 show_dirstat(options);
5879
5880 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5881 for (i = 0; i < q->nr; i++) {
5882 diff_summary(options, q->queue[i]);
5883 }
5884 separator++;
5885 }
5886
5887 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5888 options->flags.exit_with_status &&
5889 options->flags.diff_from_contents) {
5890 /*
5891 * run diff_flush_patch for the exit status. setting
5892 * options->file to /dev/null should be safe, because we
5893 * aren't supposed to produce any output anyway.
5894 */
5895 if (options->close_file)
5896 fclose(options->file);
5897 options->file = xfopen("/dev/null", "w");
5898 options->close_file = 1;
5899 options->color_moved = 0;
5900 for (i = 0; i < q->nr; i++) {
5901 struct diff_filepair *p = q->queue[i];
5902 if (check_pair_status(p))
5903 diff_flush_patch(p, options);
5904 if (options->found_changes)
5905 break;
5906 }
5907 }
5908
5909 if (output_format & DIFF_FORMAT_PATCH) {
5910 if (separator) {
5911 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5912 if (options->stat_sep)
5913 /* attach patch instead of inline */
5914 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5915 NULL, 0, 0);
5916 }
5917
5918 diff_flush_patch_all_file_pairs(options);
5919 }
5920
5921 if (output_format & DIFF_FORMAT_CALLBACK)
5922 options->format_callback(q, options, options->format_callback_data);
5923
5924 for (i = 0; i < q->nr; i++)
5925 diff_free_filepair(q->queue[i]);
5926 free_queue:
5927 free(q->queue);
5928 DIFF_QUEUE_CLEAR(q);
5929 if (options->close_file)
5930 fclose(options->file);
5931
5932 /*
5933 * Report the content-level differences with HAS_CHANGES;
5934 * diff_addremove/diff_change does not set the bit when
5935 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5936 */
5937 if (options->flags.diff_from_contents) {
5938 if (options->found_changes)
5939 options->flags.has_changes = 1;
5940 else
5941 options->flags.has_changes = 0;
5942 }
5943 }
5944
5945 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5946 {
5947 return (((p->status == DIFF_STATUS_MODIFIED) &&
5948 ((p->score &&
5949 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5950 (!p->score &&
5951 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5952 ((p->status != DIFF_STATUS_MODIFIED) &&
5953 filter_bit_tst(p->status, options)));
5954 }
5955
5956 static void diffcore_apply_filter(struct diff_options *options)
5957 {
5958 int i;
5959 struct diff_queue_struct *q = &diff_queued_diff;
5960 struct diff_queue_struct outq;
5961
5962 DIFF_QUEUE_CLEAR(&outq);
5963
5964 if (!options->filter)
5965 return;
5966
5967 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5968 int found;
5969 for (i = found = 0; !found && i < q->nr; i++) {
5970 if (match_filter(options, q->queue[i]))
5971 found++;
5972 }
5973 if (found)
5974 return;
5975
5976 /* otherwise we will clear the whole queue
5977 * by copying the empty outq at the end of this
5978 * function, but first clear the current entries
5979 * in the queue.
5980 */
5981 for (i = 0; i < q->nr; i++)
5982 diff_free_filepair(q->queue[i]);
5983 }
5984 else {
5985 /* Only the matching ones */
5986 for (i = 0; i < q->nr; i++) {
5987 struct diff_filepair *p = q->queue[i];
5988 if (match_filter(options, p))
5989 diff_q(&outq, p);
5990 else
5991 diff_free_filepair(p);
5992 }
5993 }
5994 free(q->queue);
5995 *q = outq;
5996 }
5997
5998 /* Check whether two filespecs with the same mode and size are identical */
5999 static int diff_filespec_is_identical(struct diff_filespec *one,
6000 struct diff_filespec *two)
6001 {
6002 if (S_ISGITLINK(one->mode))
6003 return 0;
6004 if (diff_populate_filespec(one, 0))
6005 return 0;
6006 if (diff_populate_filespec(two, 0))
6007 return 0;
6008 return !memcmp(one->data, two->data, one->size);
6009 }
6010
6011 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
6012 {
6013 if (p->done_skip_stat_unmatch)
6014 return p->skip_stat_unmatch_result;
6015
6016 p->done_skip_stat_unmatch = 1;
6017 p->skip_stat_unmatch_result = 0;
6018 /*
6019 * 1. Entries that come from stat info dirtiness
6020 * always have both sides (iow, not create/delete),
6021 * one side of the object name is unknown, with
6022 * the same mode and size. Keep the ones that
6023 * do not match these criteria. They have real
6024 * differences.
6025 *
6026 * 2. At this point, the file is known to be modified,
6027 * with the same mode and size, and the object
6028 * name of one side is unknown. Need to inspect
6029 * the identical contents.
6030 */
6031 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6032 !DIFF_FILE_VALID(p->two) ||
6033 (p->one->oid_valid && p->two->oid_valid) ||
6034 (p->one->mode != p->two->mode) ||
6035 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
6036 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
6037 (p->one->size != p->two->size) ||
6038 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
6039 p->skip_stat_unmatch_result = 1;
6040 return p->skip_stat_unmatch_result;
6041 }
6042
6043 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6044 {
6045 int i;
6046 struct diff_queue_struct *q = &diff_queued_diff;
6047 struct diff_queue_struct outq;
6048 DIFF_QUEUE_CLEAR(&outq);
6049
6050 for (i = 0; i < q->nr; i++) {
6051 struct diff_filepair *p = q->queue[i];
6052
6053 if (diff_filespec_check_stat_unmatch(p))
6054 diff_q(&outq, p);
6055 else {
6056 /*
6057 * The caller can subtract 1 from skip_stat_unmatch
6058 * to determine how many paths were dirty only
6059 * due to stat info mismatch.
6060 */
6061 if (!diffopt->flags.no_index)
6062 diffopt->skip_stat_unmatch++;
6063 diff_free_filepair(p);
6064 }
6065 }
6066 free(q->queue);
6067 *q = outq;
6068 }
6069
6070 static int diffnamecmp(const void *a_, const void *b_)
6071 {
6072 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6073 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6074 const char *name_a, *name_b;
6075
6076 name_a = a->one ? a->one->path : a->two->path;
6077 name_b = b->one ? b->one->path : b->two->path;
6078 return strcmp(name_a, name_b);
6079 }
6080
6081 void diffcore_fix_diff_index(struct diff_options *options)
6082 {
6083 struct diff_queue_struct *q = &diff_queued_diff;
6084 QSORT(q->queue, q->nr, diffnamecmp);
6085 }
6086
6087 void diffcore_std(struct diff_options *options)
6088 {
6089 /* NOTE please keep the following in sync with diff_tree_combined() */
6090 if (options->skip_stat_unmatch)
6091 diffcore_skip_stat_unmatch(options);
6092 if (!options->found_follow) {
6093 /* See try_to_follow_renames() in tree-diff.c */
6094 if (options->break_opt != -1)
6095 diffcore_break(options->break_opt);
6096 if (options->detect_rename)
6097 diffcore_rename(options);
6098 if (options->break_opt != -1)
6099 diffcore_merge_broken();
6100 }
6101 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6102 diffcore_pickaxe(options);
6103 if (options->orderfile)
6104 diffcore_order(options->orderfile);
6105 if (!options->found_follow)
6106 /* See try_to_follow_renames() in tree-diff.c */
6107 diff_resolve_rename_copy();
6108 diffcore_apply_filter(options);
6109
6110 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6111 options->flags.has_changes = 1;
6112 else
6113 options->flags.has_changes = 0;
6114
6115 options->found_follow = 0;
6116 }
6117
6118 int diff_result_code(struct diff_options *opt, int status)
6119 {
6120 int result = 0;
6121
6122 diff_warn_rename_limit("diff.renameLimit",
6123 opt->needed_rename_limit,
6124 opt->degraded_cc_to_c);
6125 if (!opt->flags.exit_with_status &&
6126 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6127 return status;
6128 if (opt->flags.exit_with_status &&
6129 opt->flags.has_changes)
6130 result |= 01;
6131 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6132 opt->flags.check_failed)
6133 result |= 02;
6134 return result;
6135 }
6136
6137 int diff_can_quit_early(struct diff_options *opt)
6138 {
6139 return (opt->flags.quick &&
6140 !opt->filter &&
6141 opt->flags.has_changes);
6142 }
6143
6144 /*
6145 * Shall changes to this submodule be ignored?
6146 *
6147 * Submodule changes can be configured to be ignored separately for each path,
6148 * but that configuration can be overridden from the command line.
6149 */
6150 static int is_submodule_ignored(const char *path, struct diff_options *options)
6151 {
6152 int ignored = 0;
6153 struct diff_flags orig_flags = options->flags;
6154 if (!options->flags.override_submodule_config)
6155 set_diffopt_flags_from_submodule_config(options, path);
6156 if (options->flags.ignore_submodules)
6157 ignored = 1;
6158 options->flags = orig_flags;
6159 return ignored;
6160 }
6161
6162 void diff_addremove(struct diff_options *options,
6163 int addremove, unsigned mode,
6164 const struct object_id *oid,
6165 int oid_valid,
6166 const char *concatpath, unsigned dirty_submodule)
6167 {
6168 struct diff_filespec *one, *two;
6169
6170 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6171 return;
6172
6173 /* This may look odd, but it is a preparation for
6174 * feeding "there are unchanged files which should
6175 * not produce diffs, but when you are doing copy
6176 * detection you would need them, so here they are"
6177 * entries to the diff-core. They will be prefixed
6178 * with something like '=' or '*' (I haven't decided
6179 * which but should not make any difference).
6180 * Feeding the same new and old to diff_change()
6181 * also has the same effect.
6182 * Before the final output happens, they are pruned after
6183 * merged into rename/copy pairs as appropriate.
6184 */
6185 if (options->flags.reverse_diff)
6186 addremove = (addremove == '+' ? '-' :
6187 addremove == '-' ? '+' : addremove);
6188
6189 if (options->prefix &&
6190 strncmp(concatpath, options->prefix, options->prefix_length))
6191 return;
6192
6193 one = alloc_filespec(concatpath);
6194 two = alloc_filespec(concatpath);
6195
6196 if (addremove != '+')
6197 fill_filespec(one, oid, oid_valid, mode);
6198 if (addremove != '-') {
6199 fill_filespec(two, oid, oid_valid, mode);
6200 two->dirty_submodule = dirty_submodule;
6201 }
6202
6203 diff_queue(&diff_queued_diff, one, two);
6204 if (!options->flags.diff_from_contents)
6205 options->flags.has_changes = 1;
6206 }
6207
6208 void diff_change(struct diff_options *options,
6209 unsigned old_mode, unsigned new_mode,
6210 const struct object_id *old_oid,
6211 const struct object_id *new_oid,
6212 int old_oid_valid, int new_oid_valid,
6213 const char *concatpath,
6214 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6215 {
6216 struct diff_filespec *one, *two;
6217 struct diff_filepair *p;
6218
6219 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6220 is_submodule_ignored(concatpath, options))
6221 return;
6222
6223 if (options->flags.reverse_diff) {
6224 SWAP(old_mode, new_mode);
6225 SWAP(old_oid, new_oid);
6226 SWAP(old_oid_valid, new_oid_valid);
6227 SWAP(old_dirty_submodule, new_dirty_submodule);
6228 }
6229
6230 if (options->prefix &&
6231 strncmp(concatpath, options->prefix, options->prefix_length))
6232 return;
6233
6234 one = alloc_filespec(concatpath);
6235 two = alloc_filespec(concatpath);
6236 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6237 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6238 one->dirty_submodule = old_dirty_submodule;
6239 two->dirty_submodule = new_dirty_submodule;
6240 p = diff_queue(&diff_queued_diff, one, two);
6241
6242 if (options->flags.diff_from_contents)
6243 return;
6244
6245 if (options->flags.quick && options->skip_stat_unmatch &&
6246 !diff_filespec_check_stat_unmatch(p))
6247 return;
6248
6249 options->flags.has_changes = 1;
6250 }
6251
6252 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6253 {
6254 struct diff_filepair *pair;
6255 struct diff_filespec *one, *two;
6256
6257 if (options->prefix &&
6258 strncmp(path, options->prefix, options->prefix_length))
6259 return NULL;
6260
6261 one = alloc_filespec(path);
6262 two = alloc_filespec(path);
6263 pair = diff_queue(&diff_queued_diff, one, two);
6264 pair->is_unmerged = 1;
6265 return pair;
6266 }
6267
6268 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
6269 size_t *outsize)
6270 {
6271 struct diff_tempfile *temp;
6272 const char *argv[3];
6273 const char **arg = argv;
6274 struct child_process child = CHILD_PROCESS_INIT;
6275 struct strbuf buf = STRBUF_INIT;
6276 int err = 0;
6277
6278 temp = prepare_temp_file(spec->path, spec);
6279 *arg++ = pgm;
6280 *arg++ = temp->name;
6281 *arg = NULL;
6282
6283 child.use_shell = 1;
6284 child.argv = argv;
6285 child.out = -1;
6286 if (start_command(&child)) {
6287 remove_tempfile();
6288 return NULL;
6289 }
6290
6291 if (strbuf_read(&buf, child.out, 0) < 0)
6292 err = error("error reading from textconv command '%s'", pgm);
6293 close(child.out);
6294
6295 if (finish_command(&child) || err) {
6296 strbuf_release(&buf);
6297 remove_tempfile();
6298 return NULL;
6299 }
6300 remove_tempfile();
6301
6302 return strbuf_detach(&buf, outsize);
6303 }
6304
6305 size_t fill_textconv(struct userdiff_driver *driver,
6306 struct diff_filespec *df,
6307 char **outbuf)
6308 {
6309 size_t size;
6310
6311 if (!driver) {
6312 if (!DIFF_FILE_VALID(df)) {
6313 *outbuf = "";
6314 return 0;
6315 }
6316 if (diff_populate_filespec(df, 0))
6317 die("unable to read files to diff");
6318 *outbuf = df->data;
6319 return df->size;
6320 }
6321
6322 if (!driver->textconv)
6323 BUG("fill_textconv called with non-textconv driver");
6324
6325 if (driver->textconv_cache && df->oid_valid) {
6326 *outbuf = notes_cache_get(driver->textconv_cache,
6327 &df->oid,
6328 &size);
6329 if (*outbuf)
6330 return size;
6331 }
6332
6333 *outbuf = run_textconv(driver->textconv, df, &size);
6334 if (!*outbuf)
6335 die("unable to read files to diff");
6336
6337 if (driver->textconv_cache && df->oid_valid) {
6338 /* ignore errors, as we might be in a readonly repository */
6339 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6340 size);
6341 /*
6342 * we could save up changes and flush them all at the end,
6343 * but we would need an extra call after all diffing is done.
6344 * Since generating a cache entry is the slow path anyway,
6345 * this extra overhead probably isn't a big deal.
6346 */
6347 notes_cache_write(driver->textconv_cache);
6348 }
6349
6350 return size;
6351 }
6352
6353 int textconv_object(const char *path,
6354 unsigned mode,
6355 const struct object_id *oid,
6356 int oid_valid,
6357 char **buf,
6358 unsigned long *buf_size)
6359 {
6360 struct diff_filespec *df;
6361 struct userdiff_driver *textconv;
6362
6363 df = alloc_filespec(path);
6364 fill_filespec(df, oid, oid_valid, mode);
6365 textconv = get_textconv(df);
6366 if (!textconv) {
6367 free_filespec(df);
6368 return 0;
6369 }
6370
6371 *buf_size = fill_textconv(textconv, df, buf);
6372 free_filespec(df);
6373 return 1;
6374 }
6375
6376 void setup_diff_pager(struct diff_options *opt)
6377 {
6378 /*
6379 * If the user asked for our exit code, then either they want --quiet
6380 * or --exit-code. We should definitely not bother with a pager in the
6381 * former case, as we will generate no output. Since we still properly
6382 * report our exit code even when a pager is run, we _could_ run a
6383 * pager with --exit-code. But since we have not done so historically,
6384 * and because it is easy to find people oneline advising "git diff
6385 * --exit-code" in hooks and other scripts, we do not do so.
6386 */
6387 if (!opt->flags.exit_with_status &&
6388 check_pager_config("diff") != 0)
6389 setup_pager();
6390 }
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