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merge-ort: add some more explanations in collect_merge_info_callback()
[git/debian.git] / diff.c
blob260dc37d4bf37b2d582d1c5612f704923e1c2a78
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 "strvec.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "parse-options.h"
27 #include "help.h"
28 #include "promisor-remote.h"
29
30 #ifdef NO_FAST_WORKING_DIRECTORY
31 #define FAST_WORKING_DIRECTORY 0
32 #else
33 #define FAST_WORKING_DIRECTORY 1
34 #endif
35
36 static int diff_detect_rename_default;
37 static int diff_indent_heuristic = 1;
38 static int diff_rename_limit_default = 400;
39 static int diff_suppress_blank_empty;
40 static int diff_use_color_default = -1;
41 static int diff_color_moved_default;
42 static int diff_color_moved_ws_default;
43 static int diff_context_default = 3;
44 static int diff_interhunk_context_default;
45 static const char *diff_word_regex_cfg;
46 static const char *external_diff_cmd_cfg;
47 static const char *diff_order_file_cfg;
48 int diff_auto_refresh_index = 1;
49 static int diff_mnemonic_prefix;
50 static int diff_no_prefix;
51 static int diff_relative;
52 static int diff_stat_graph_width;
53 static int diff_dirstat_permille_default = 30;
54 static struct diff_options default_diff_options;
55 static long diff_algorithm;
56 static unsigned ws_error_highlight_default = WSEH_NEW;
57
58 static char diff_colors[][COLOR_MAXLEN] = {
59 GIT_COLOR_RESET,
60 GIT_COLOR_NORMAL, /* CONTEXT */
61 GIT_COLOR_BOLD, /* METAINFO */
62 GIT_COLOR_CYAN, /* FRAGINFO */
63 GIT_COLOR_RED, /* OLD */
64 GIT_COLOR_GREEN, /* NEW */
65 GIT_COLOR_YELLOW, /* COMMIT */
66 GIT_COLOR_BG_RED, /* WHITESPACE */
67 GIT_COLOR_NORMAL, /* FUNCINFO */
68 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
69 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
70 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
71 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
72 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
73 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
74 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
75 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
76 GIT_COLOR_FAINT, /* CONTEXT_DIM */
77 GIT_COLOR_FAINT_RED, /* OLD_DIM */
78 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
79 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
80 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
81 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
82 };
83
84 static const char *color_diff_slots[] = {
85 [DIFF_CONTEXT] = "context",
86 [DIFF_METAINFO] = "meta",
87 [DIFF_FRAGINFO] = "frag",
88 [DIFF_FILE_OLD] = "old",
89 [DIFF_FILE_NEW] = "new",
90 [DIFF_COMMIT] = "commit",
91 [DIFF_WHITESPACE] = "whitespace",
92 [DIFF_FUNCINFO] = "func",
93 [DIFF_FILE_OLD_MOVED] = "oldMoved",
94 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
95 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
96 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
97 [DIFF_FILE_NEW_MOVED] = "newMoved",
98 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
99 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
100 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
101 [DIFF_CONTEXT_DIM] = "contextDimmed",
102 [DIFF_FILE_OLD_DIM] = "oldDimmed",
103 [DIFF_FILE_NEW_DIM] = "newDimmed",
104 [DIFF_CONTEXT_BOLD] = "contextBold",
105 [DIFF_FILE_OLD_BOLD] = "oldBold",
106 [DIFF_FILE_NEW_BOLD] = "newBold",
107 };
108
109 define_list_config_array_extra(color_diff_slots, {"plain"});
110
111 static int parse_diff_color_slot(const char *var)
112 {
113 if (!strcasecmp(var, "plain"))
114 return DIFF_CONTEXT;
115 return LOOKUP_CONFIG(color_diff_slots, var);
116 }
117
118 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
119 struct strbuf *errmsg)
120 {
121 char *params_copy = xstrdup(params_string);
122 struct string_list params = STRING_LIST_INIT_NODUP;
123 int ret = 0;
124 int i;
125
126 if (*params_copy)
127 string_list_split_in_place(&params, params_copy, ',', -1);
128 for (i = 0; i < params.nr; i++) {
129 const char *p = params.items[i].string;
130 if (!strcmp(p, "changes")) {
131 options->flags.dirstat_by_line = 0;
132 options->flags.dirstat_by_file = 0;
133 } else if (!strcmp(p, "lines")) {
134 options->flags.dirstat_by_line = 1;
135 options->flags.dirstat_by_file = 0;
136 } else if (!strcmp(p, "files")) {
137 options->flags.dirstat_by_line = 0;
138 options->flags.dirstat_by_file = 1;
139 } else if (!strcmp(p, "noncumulative")) {
140 options->flags.dirstat_cumulative = 0;
141 } else if (!strcmp(p, "cumulative")) {
142 options->flags.dirstat_cumulative = 1;
143 } else if (isdigit(*p)) {
144 char *end;
145 int permille = strtoul(p, &end, 10) * 10;
146 if (*end == '.' && isdigit(*++end)) {
147 /* only use first digit */
148 permille += *end - '0';
149 /* .. and ignore any further digits */
150 while (isdigit(*++end))
151 ; /* nothing */
152 }
153 if (!*end)
154 options->dirstat_permille = permille;
155 else {
156 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
157 p);
158 ret++;
159 }
160 } else {
161 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
162 ret++;
163 }
164
165 }
166 string_list_clear(&params, 0);
167 free(params_copy);
168 return ret;
169 }
170
171 static int parse_submodule_params(struct diff_options *options, const char *value)
172 {
173 if (!strcmp(value, "log"))
174 options->submodule_format = DIFF_SUBMODULE_LOG;
175 else if (!strcmp(value, "short"))
176 options->submodule_format = DIFF_SUBMODULE_SHORT;
177 else if (!strcmp(value, "diff"))
178 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
179 /*
180 * Please update $__git_diff_submodule_formats in
181 * git-completion.bash when you add new formats.
182 */
183 else
184 return -1;
185 return 0;
186 }
187
188 int git_config_rename(const char *var, const char *value)
189 {
190 if (!value)
191 return DIFF_DETECT_RENAME;
192 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
193 return DIFF_DETECT_COPY;
194 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
195 }
196
197 long parse_algorithm_value(const char *value)
198 {
199 if (!value)
200 return -1;
201 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
202 return 0;
203 else if (!strcasecmp(value, "minimal"))
204 return XDF_NEED_MINIMAL;
205 else if (!strcasecmp(value, "patience"))
206 return XDF_PATIENCE_DIFF;
207 else if (!strcasecmp(value, "histogram"))
208 return XDF_HISTOGRAM_DIFF;
209 /*
210 * Please update $__git_diff_algorithms in git-completion.bash
211 * when you add new algorithms.
212 */
213 return -1;
214 }
215
216 static int parse_one_token(const char **arg, const char *token)
217 {
218 const char *rest;
219 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
220 *arg = rest;
221 return 1;
222 }
223 return 0;
224 }
225
226 static int parse_ws_error_highlight(const char *arg)
227 {
228 const char *orig_arg = arg;
229 unsigned val = 0;
230
231 while (*arg) {
232 if (parse_one_token(&arg, "none"))
233 val = 0;
234 else if (parse_one_token(&arg, "default"))
235 val = WSEH_NEW;
236 else if (parse_one_token(&arg, "all"))
237 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
238 else if (parse_one_token(&arg, "new"))
239 val |= WSEH_NEW;
240 else if (parse_one_token(&arg, "old"))
241 val |= WSEH_OLD;
242 else if (parse_one_token(&arg, "context"))
243 val |= WSEH_CONTEXT;
244 else {
245 return -1 - (int)(arg - orig_arg);
246 }
247 if (*arg)
248 arg++;
249 }
250 return val;
251 }
252
253 /*
254 * These are to give UI layer defaults.
255 * The core-level commands such as git-diff-files should
256 * never be affected by the setting of diff.renames
257 * the user happens to have in the configuration file.
258 */
259 void init_diff_ui_defaults(void)
260 {
261 diff_detect_rename_default = DIFF_DETECT_RENAME;
262 }
263
264 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
265 {
266 if (!strcmp(var, "diff.indentheuristic"))
267 diff_indent_heuristic = git_config_bool(var, value);
268 return 0;
269 }
270
271 static int parse_color_moved(const char *arg)
272 {
273 switch (git_parse_maybe_bool(arg)) {
274 case 0:
275 return COLOR_MOVED_NO;
276 case 1:
277 return COLOR_MOVED_DEFAULT;
278 default:
279 break;
280 }
281
282 if (!strcmp(arg, "no"))
283 return COLOR_MOVED_NO;
284 else if (!strcmp(arg, "plain"))
285 return COLOR_MOVED_PLAIN;
286 else if (!strcmp(arg, "blocks"))
287 return COLOR_MOVED_BLOCKS;
288 else if (!strcmp(arg, "zebra"))
289 return COLOR_MOVED_ZEBRA;
290 else if (!strcmp(arg, "default"))
291 return COLOR_MOVED_DEFAULT;
292 else if (!strcmp(arg, "dimmed-zebra"))
293 return COLOR_MOVED_ZEBRA_DIM;
294 else if (!strcmp(arg, "dimmed_zebra"))
295 return COLOR_MOVED_ZEBRA_DIM;
296 else
297 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
298 }
299
300 static unsigned parse_color_moved_ws(const char *arg)
301 {
302 int ret = 0;
303 struct string_list l = STRING_LIST_INIT_DUP;
304 struct string_list_item *i;
305
306 string_list_split(&l, arg, ',', -1);
307
308 for_each_string_list_item(i, &l) {
309 struct strbuf sb = STRBUF_INIT;
310 strbuf_addstr(&sb, i->string);
311 strbuf_trim(&sb);
312
313 if (!strcmp(sb.buf, "no"))
314 ret = 0;
315 else if (!strcmp(sb.buf, "ignore-space-change"))
316 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
317 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
318 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
319 else if (!strcmp(sb.buf, "ignore-all-space"))
320 ret |= XDF_IGNORE_WHITESPACE;
321 else if (!strcmp(sb.buf, "allow-indentation-change"))
322 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
323 else {
324 ret |= COLOR_MOVED_WS_ERROR;
325 error(_("unknown color-moved-ws mode '%s', possible values are 'ignore-space-change', 'ignore-space-at-eol', 'ignore-all-space', 'allow-indentation-change'"), sb.buf);
326 }
327
328 strbuf_release(&sb);
329 }
330
331 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
332 (ret & XDF_WHITESPACE_FLAGS)) {
333 error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
334 ret |= COLOR_MOVED_WS_ERROR;
335 }
336
337 string_list_clear(&l, 0);
338
339 return ret;
340 }
341
342 int git_diff_ui_config(const char *var, const char *value, void *cb)
343 {
344 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
345 diff_use_color_default = git_config_colorbool(var, value);
346 return 0;
347 }
348 if (!strcmp(var, "diff.colormoved")) {
349 int cm = parse_color_moved(value);
350 if (cm < 0)
351 return -1;
352 diff_color_moved_default = cm;
353 return 0;
354 }
355 if (!strcmp(var, "diff.colormovedws")) {
356 unsigned cm = parse_color_moved_ws(value);
357 if (cm & COLOR_MOVED_WS_ERROR)
358 return -1;
359 diff_color_moved_ws_default = cm;
360 return 0;
361 }
362 if (!strcmp(var, "diff.context")) {
363 diff_context_default = git_config_int(var, value);
364 if (diff_context_default < 0)
365 return -1;
366 return 0;
367 }
368 if (!strcmp(var, "diff.interhunkcontext")) {
369 diff_interhunk_context_default = git_config_int(var, value);
370 if (diff_interhunk_context_default < 0)
371 return -1;
372 return 0;
373 }
374 if (!strcmp(var, "diff.renames")) {
375 diff_detect_rename_default = git_config_rename(var, value);
376 return 0;
377 }
378 if (!strcmp(var, "diff.autorefreshindex")) {
379 diff_auto_refresh_index = git_config_bool(var, value);
380 return 0;
381 }
382 if (!strcmp(var, "diff.mnemonicprefix")) {
383 diff_mnemonic_prefix = git_config_bool(var, value);
384 return 0;
385 }
386 if (!strcmp(var, "diff.noprefix")) {
387 diff_no_prefix = git_config_bool(var, value);
388 return 0;
389 }
390 if (!strcmp(var, "diff.relative")) {
391 diff_relative = git_config_bool(var, value);
392 return 0;
393 }
394 if (!strcmp(var, "diff.statgraphwidth")) {
395 diff_stat_graph_width = git_config_int(var, value);
396 return 0;
397 }
398 if (!strcmp(var, "diff.external"))
399 return git_config_string(&external_diff_cmd_cfg, var, value);
400 if (!strcmp(var, "diff.wordregex"))
401 return git_config_string(&diff_word_regex_cfg, var, value);
402 if (!strcmp(var, "diff.orderfile"))
403 return git_config_pathname(&diff_order_file_cfg, var, value);
404
405 if (!strcmp(var, "diff.ignoresubmodules"))
406 handle_ignore_submodules_arg(&default_diff_options, value);
407
408 if (!strcmp(var, "diff.submodule")) {
409 if (parse_submodule_params(&default_diff_options, value))
410 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
411 value);
412 return 0;
413 }
414
415 if (!strcmp(var, "diff.algorithm")) {
416 diff_algorithm = parse_algorithm_value(value);
417 if (diff_algorithm < 0)
418 return -1;
419 return 0;
420 }
421
422 if (git_color_config(var, value, cb) < 0)
423 return -1;
424
425 return git_diff_basic_config(var, value, cb);
426 }
427
428 int git_diff_basic_config(const char *var, const char *value, void *cb)
429 {
430 const char *name;
431
432 if (!strcmp(var, "diff.renamelimit")) {
433 diff_rename_limit_default = git_config_int(var, value);
434 return 0;
435 }
436
437 if (userdiff_config(var, value) < 0)
438 return -1;
439
440 if (skip_prefix(var, "diff.color.", &name) ||
441 skip_prefix(var, "color.diff.", &name)) {
442 int slot = parse_diff_color_slot(name);
443 if (slot < 0)
444 return 0;
445 if (!value)
446 return config_error_nonbool(var);
447 return color_parse(value, diff_colors[slot]);
448 }
449
450 if (!strcmp(var, "diff.wserrorhighlight")) {
451 int val = parse_ws_error_highlight(value);
452 if (val < 0)
453 return -1;
454 ws_error_highlight_default = val;
455 return 0;
456 }
457
458 /* like GNU diff's --suppress-blank-empty option */
459 if (!strcmp(var, "diff.suppressblankempty") ||
460 /* for backwards compatibility */
461 !strcmp(var, "diff.suppress-blank-empty")) {
462 diff_suppress_blank_empty = git_config_bool(var, value);
463 return 0;
464 }
465
466 if (!strcmp(var, "diff.dirstat")) {
467 struct strbuf errmsg = STRBUF_INIT;
468 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
469 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
470 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
471 errmsg.buf);
472 strbuf_release(&errmsg);
473 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
474 return 0;
475 }
476
477 if (git_diff_heuristic_config(var, value, cb) < 0)
478 return -1;
479
480 return git_default_config(var, value, cb);
481 }
482
483 static char *quote_two(const char *one, const char *two)
484 {
485 int need_one = quote_c_style(one, NULL, NULL, CQUOTE_NODQ);
486 int need_two = quote_c_style(two, NULL, NULL, CQUOTE_NODQ);
487 struct strbuf res = STRBUF_INIT;
488
489 if (need_one + need_two) {
490 strbuf_addch(&res, '"');
491 quote_c_style(one, &res, NULL, CQUOTE_NODQ);
492 quote_c_style(two, &res, NULL, CQUOTE_NODQ);
493 strbuf_addch(&res, '"');
494 } else {
495 strbuf_addstr(&res, one);
496 strbuf_addstr(&res, two);
497 }
498 return strbuf_detach(&res, NULL);
499 }
500
501 static const char *external_diff(void)
502 {
503 static const char *external_diff_cmd = NULL;
504 static int done_preparing = 0;
505
506 if (done_preparing)
507 return external_diff_cmd;
508 external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
509 if (!external_diff_cmd)
510 external_diff_cmd = external_diff_cmd_cfg;
511 done_preparing = 1;
512 return external_diff_cmd;
513 }
514
515 /*
516 * Keep track of files used for diffing. Sometimes such an entry
517 * refers to a temporary file, sometimes to an existing file, and
518 * sometimes to "/dev/null".
519 */
520 static struct diff_tempfile {
521 /*
522 * filename external diff should read from, or NULL if this
523 * entry is currently not in use:
524 */
525 const char *name;
526
527 char hex[GIT_MAX_HEXSZ + 1];
528 char mode[10];
529
530 /*
531 * If this diff_tempfile instance refers to a temporary file,
532 * this tempfile object is used to manage its lifetime.
533 */
534 struct tempfile *tempfile;
535 } diff_temp[2];
536
537 struct emit_callback {
538 int color_diff;
539 unsigned ws_rule;
540 int blank_at_eof_in_preimage;
541 int blank_at_eof_in_postimage;
542 int lno_in_preimage;
543 int lno_in_postimage;
544 const char **label_path;
545 struct diff_words_data *diff_words;
546 struct diff_options *opt;
547 struct strbuf *header;
548 };
549
550 static int count_lines(const char *data, int size)
551 {
552 int count, ch, completely_empty = 1, nl_just_seen = 0;
553 count = 0;
554 while (0 < size--) {
555 ch = *data++;
556 if (ch == '\n') {
557 count++;
558 nl_just_seen = 1;
559 completely_empty = 0;
560 }
561 else {
562 nl_just_seen = 0;
563 completely_empty = 0;
564 }
565 }
566 if (completely_empty)
567 return 0;
568 if (!nl_just_seen)
569 count++; /* no trailing newline */
570 return count;
571 }
572
573 static int fill_mmfile(struct repository *r, mmfile_t *mf,
574 struct diff_filespec *one)
575 {
576 if (!DIFF_FILE_VALID(one)) {
577 mf->ptr = (char *)""; /* does not matter */
578 mf->size = 0;
579 return 0;
580 }
581 else if (diff_populate_filespec(r, one, NULL))
582 return -1;
583
584 mf->ptr = one->data;
585 mf->size = one->size;
586 return 0;
587 }
588
589 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
590 static unsigned long diff_filespec_size(struct repository *r,
591 struct diff_filespec *one)
592 {
593 struct diff_populate_filespec_options dpf_options = {
594 .check_size_only = 1,
595 };
596
597 if (!DIFF_FILE_VALID(one))
598 return 0;
599 diff_populate_filespec(r, one, &dpf_options);
600 return one->size;
601 }
602
603 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
604 {
605 char *ptr = mf->ptr;
606 long size = mf->size;
607 int cnt = 0;
608
609 if (!size)
610 return cnt;
611 ptr += size - 1; /* pointing at the very end */
612 if (*ptr != '\n')
613 ; /* incomplete line */
614 else
615 ptr--; /* skip the last LF */
616 while (mf->ptr < ptr) {
617 char *prev_eol;
618 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
619 if (*prev_eol == '\n')
620 break;
621 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
622 break;
623 cnt++;
624 ptr = prev_eol - 1;
625 }
626 return cnt;
627 }
628
629 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
630 struct emit_callback *ecbdata)
631 {
632 int l1, l2, at;
633 unsigned ws_rule = ecbdata->ws_rule;
634 l1 = count_trailing_blank(mf1, ws_rule);
635 l2 = count_trailing_blank(mf2, ws_rule);
636 if (l2 <= l1) {
637 ecbdata->blank_at_eof_in_preimage = 0;
638 ecbdata->blank_at_eof_in_postimage = 0;
639 return;
640 }
641 at = count_lines(mf1->ptr, mf1->size);
642 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
643
644 at = count_lines(mf2->ptr, mf2->size);
645 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
646 }
647
648 static void emit_line_0(struct diff_options *o,
649 const char *set_sign, const char *set, unsigned reverse, const char *reset,
650 int first, const char *line, int len)
651 {
652 int has_trailing_newline, has_trailing_carriage_return;
653 int needs_reset = 0; /* at the end of the line */
654 FILE *file = o->file;
655
656 fputs(diff_line_prefix(o), file);
657
658 has_trailing_newline = (len > 0 && line[len-1] == '\n');
659 if (has_trailing_newline)
660 len--;
661
662 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
663 if (has_trailing_carriage_return)
664 len--;
665
666 if (!len && !first)
667 goto end_of_line;
668
669 if (reverse && want_color(o->use_color)) {
670 fputs(GIT_COLOR_REVERSE, file);
671 needs_reset = 1;
672 }
673
674 if (set_sign) {
675 fputs(set_sign, file);
676 needs_reset = 1;
677 }
678
679 if (first)
680 fputc(first, file);
681
682 if (!len)
683 goto end_of_line;
684
685 if (set) {
686 if (set_sign && set != set_sign)
687 fputs(reset, file);
688 fputs(set, file);
689 needs_reset = 1;
690 }
691 fwrite(line, len, 1, file);
692 needs_reset = 1; /* 'line' may contain color codes. */
693
694 end_of_line:
695 if (needs_reset)
696 fputs(reset, file);
697 if (has_trailing_carriage_return)
698 fputc('\r', file);
699 if (has_trailing_newline)
700 fputc('\n', file);
701 }
702
703 static void emit_line(struct diff_options *o, const char *set, const char *reset,
704 const char *line, int len)
705 {
706 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
707 }
708
709 enum diff_symbol {
710 DIFF_SYMBOL_BINARY_DIFF_HEADER,
711 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
712 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
713 DIFF_SYMBOL_BINARY_DIFF_BODY,
714 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
715 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
716 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
717 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
718 DIFF_SYMBOL_STATS_LINE,
719 DIFF_SYMBOL_WORD_DIFF,
720 DIFF_SYMBOL_STAT_SEP,
721 DIFF_SYMBOL_SUMMARY,
722 DIFF_SYMBOL_SUBMODULE_ADD,
723 DIFF_SYMBOL_SUBMODULE_DEL,
724 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
725 DIFF_SYMBOL_SUBMODULE_MODIFIED,
726 DIFF_SYMBOL_SUBMODULE_HEADER,
727 DIFF_SYMBOL_SUBMODULE_ERROR,
728 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
729 DIFF_SYMBOL_REWRITE_DIFF,
730 DIFF_SYMBOL_BINARY_FILES,
731 DIFF_SYMBOL_HEADER,
732 DIFF_SYMBOL_FILEPAIR_PLUS,
733 DIFF_SYMBOL_FILEPAIR_MINUS,
734 DIFF_SYMBOL_WORDS_PORCELAIN,
735 DIFF_SYMBOL_WORDS,
736 DIFF_SYMBOL_CONTEXT,
737 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
738 DIFF_SYMBOL_PLUS,
739 DIFF_SYMBOL_MINUS,
740 DIFF_SYMBOL_NO_LF_EOF,
741 DIFF_SYMBOL_CONTEXT_FRAGINFO,
742 DIFF_SYMBOL_CONTEXT_MARKER,
743 DIFF_SYMBOL_SEPARATOR
744 };
745 /*
746 * Flags for content lines:
747 * 0..12 are whitespace rules
748 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
749 * 16 is marking if the line is blank at EOF
750 */
751 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
752 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
753 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
754 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
755 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
756
757 /*
758 * This struct is used when we need to buffer the output of the diff output.
759 *
760 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
761 * into the pre/post image file. This pointer could be a union with the
762 * line pointer. By storing an offset into the file instead of the literal line,
763 * we can decrease the memory footprint for the buffered output. At first we
764 * may want to only have indirection for the content lines, but we could also
765 * enhance the state for emitting prefabricated lines, e.g. the similarity
766 * score line or hunk/file headers would only need to store a number or path
767 * and then the output can be constructed later on depending on state.
768 */
769 struct emitted_diff_symbol {
770 const char *line;
771 int len;
772 int flags;
773 int indent_off; /* Offset to first non-whitespace character */
774 int indent_width; /* The visual width of the indentation */
775 enum diff_symbol s;
776 };
777 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
778
779 struct emitted_diff_symbols {
780 struct emitted_diff_symbol *buf;
781 int nr, alloc;
782 };
783 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
784
785 static void append_emitted_diff_symbol(struct diff_options *o,
786 struct emitted_diff_symbol *e)
787 {
788 struct emitted_diff_symbol *f;
789
790 ALLOC_GROW(o->emitted_symbols->buf,
791 o->emitted_symbols->nr + 1,
792 o->emitted_symbols->alloc);
793 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
794
795 memcpy(f, e, sizeof(struct emitted_diff_symbol));
796 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
797 }
798
799 struct moved_entry {
800 struct hashmap_entry ent;
801 const struct emitted_diff_symbol *es;
802 struct moved_entry *next_line;
803 };
804
805 struct moved_block {
806 struct moved_entry *match;
807 int wsd; /* The whitespace delta of this block */
808 };
809
810 static void moved_block_clear(struct moved_block *b)
811 {
812 memset(b, 0, sizeof(*b));
813 }
814
815 #define INDENT_BLANKLINE INT_MIN
816
817 static void fill_es_indent_data(struct emitted_diff_symbol *es)
818 {
819 unsigned int off = 0, i;
820 int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
821 const char *s = es->line;
822 const int len = es->len;
823
824 /* skip any \v \f \r at start of indentation */
825 while (s[off] == '\f' || s[off] == '\v' ||
826 (s[off] == '\r' && off < len - 1))
827 off++;
828
829 /* calculate the visual width of indentation */
830 while(1) {
831 if (s[off] == ' ') {
832 width++;
833 off++;
834 } else if (s[off] == '\t') {
835 width += tab_width - (width % tab_width);
836 while (s[++off] == '\t')
837 width += tab_width;
838 } else {
839 break;
840 }
841 }
842
843 /* check if this line is blank */
844 for (i = off; i < len; i++)
845 if (!isspace(s[i]))
846 break;
847
848 if (i == len) {
849 es->indent_width = INDENT_BLANKLINE;
850 es->indent_off = len;
851 } else {
852 es->indent_off = off;
853 es->indent_width = width;
854 }
855 }
856
857 static int compute_ws_delta(const struct emitted_diff_symbol *a,
858 const struct emitted_diff_symbol *b,
859 int *out)
860 {
861 int a_len = a->len,
862 b_len = b->len,
863 a_off = a->indent_off,
864 a_width = a->indent_width,
865 b_off = b->indent_off,
866 b_width = b->indent_width;
867 int delta;
868
869 if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) {
870 *out = INDENT_BLANKLINE;
871 return 1;
872 }
873
874 if (a->s == DIFF_SYMBOL_PLUS)
875 delta = a_width - b_width;
876 else
877 delta = b_width - a_width;
878
879 if (a_len - a_off != b_len - b_off ||
880 memcmp(a->line + a_off, b->line + b_off, a_len - a_off))
881 return 0;
882
883 *out = delta;
884
885 return 1;
886 }
887
888 static int cmp_in_block_with_wsd(const struct diff_options *o,
889 const struct moved_entry *cur,
890 const struct moved_entry *match,
891 struct moved_block *pmb,
892 int n)
893 {
894 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
895 int al = cur->es->len, bl = match->es->len, cl = l->len;
896 const char *a = cur->es->line,
897 *b = match->es->line,
898 *c = l->line;
899 int a_off = cur->es->indent_off,
900 a_width = cur->es->indent_width,
901 c_off = l->indent_off,
902 c_width = l->indent_width;
903 int delta;
904
905 /*
906 * We need to check if 'cur' is equal to 'match'. As those
907 * are from the same (+/-) side, we do not need to adjust for
908 * indent changes. However these were found using fuzzy
909 * matching so we do have to check if they are equal. Here we
910 * just check the lengths. We delay calling memcmp() to check
911 * the contents until later as if the length comparison for a
912 * and c fails we can avoid the call all together.
913 */
914 if (al != bl)
915 return 1;
916
917 /* If 'l' and 'cur' are both blank then they match. */
918 if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE)
919 return 0;
920
921 /*
922 * The indent changes of the block are known and stored in pmb->wsd;
923 * however we need to check if the indent changes of the current line
924 * match those of the current block and that the text of 'l' and 'cur'
925 * after the indentation match.
926 */
927 if (cur->es->s == DIFF_SYMBOL_PLUS)
928 delta = a_width - c_width;
929 else
930 delta = c_width - a_width;
931
932 /*
933 * If the previous lines of this block were all blank then set its
934 * whitespace delta.
935 */
936 if (pmb->wsd == INDENT_BLANKLINE)
937 pmb->wsd = delta;
938
939 return !(delta == pmb->wsd && al - a_off == cl - c_off &&
940 !memcmp(a, b, al) && !
941 memcmp(a + a_off, c + c_off, al - a_off));
942 }
943
944 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
945 const struct hashmap_entry *eptr,
946 const struct hashmap_entry *entry_or_key,
947 const void *keydata)
948 {
949 const struct diff_options *diffopt = hashmap_cmp_fn_data;
950 const struct moved_entry *a, *b;
951 unsigned flags = diffopt->color_moved_ws_handling
952 & XDF_WHITESPACE_FLAGS;
953
954 a = container_of(eptr, const struct moved_entry, ent);
955 b = container_of(entry_or_key, const struct moved_entry, ent);
956
957 if (diffopt->color_moved_ws_handling &
958 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
959 /*
960 * As there is not specific white space config given,
961 * we'd need to check for a new block, so ignore all
962 * white space. The setup of the white space
963 * configuration for the next block is done else where
964 */
965 flags |= XDF_IGNORE_WHITESPACE;
966
967 return !xdiff_compare_lines(a->es->line, a->es->len,
968 b->es->line, b->es->len,
969 flags);
970 }
971
972 static struct moved_entry *prepare_entry(struct diff_options *o,
973 int line_no)
974 {
975 struct moved_entry *ret = xmalloc(sizeof(*ret));
976 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
977 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
978 unsigned int hash = xdiff_hash_string(l->line, l->len, flags);
979
980 hashmap_entry_init(&ret->ent, hash);
981 ret->es = l;
982 ret->next_line = NULL;
983
984 return ret;
985 }
986
987 static void add_lines_to_move_detection(struct diff_options *o,
988 struct hashmap *add_lines,
989 struct hashmap *del_lines)
990 {
991 struct moved_entry *prev_line = NULL;
992
993 int n;
994 for (n = 0; n < o->emitted_symbols->nr; n++) {
995 struct hashmap *hm;
996 struct moved_entry *key;
997
998 switch (o->emitted_symbols->buf[n].s) {
999 case DIFF_SYMBOL_PLUS:
1000 hm = add_lines;
1001 break;
1002 case DIFF_SYMBOL_MINUS:
1003 hm = del_lines;
1004 break;
1005 default:
1006 prev_line = NULL;
1007 continue;
1008 }
1009
1010 if (o->color_moved_ws_handling &
1011 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1012 fill_es_indent_data(&o->emitted_symbols->buf[n]);
1013 key = prepare_entry(o, n);
1014 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
1015 prev_line->next_line = key;
1016
1017 hashmap_add(hm, &key->ent);
1018 prev_line = key;
1019 }
1020 }
1021
1022 static void pmb_advance_or_null(struct diff_options *o,
1023 struct moved_entry *match,
1024 struct hashmap *hm,
1025 struct moved_block *pmb,
1026 int pmb_nr)
1027 {
1028 int i;
1029 for (i = 0; i < pmb_nr; i++) {
1030 struct moved_entry *prev = pmb[i].match;
1031 struct moved_entry *cur = (prev && prev->next_line) ?
1032 prev->next_line : NULL;
1033 if (cur && !hm->cmpfn(o, &cur->ent, &match->ent, NULL)) {
1034 pmb[i].match = cur;
1035 } else {
1036 pmb[i].match = NULL;
1037 }
1038 }
1039 }
1040
1041 static void pmb_advance_or_null_multi_match(struct diff_options *o,
1042 struct moved_entry *match,
1043 struct hashmap *hm,
1044 struct moved_block *pmb,
1045 int pmb_nr, int n)
1046 {
1047 int i;
1048 char *got_match = xcalloc(1, pmb_nr);
1049
1050 hashmap_for_each_entry_from(hm, match, ent) {
1051 for (i = 0; i < pmb_nr; i++) {
1052 struct moved_entry *prev = pmb[i].match;
1053 struct moved_entry *cur = (prev && prev->next_line) ?
1054 prev->next_line : NULL;
1055 if (!cur)
1056 continue;
1057 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
1058 got_match[i] |= 1;
1059 }
1060 }
1061
1062 for (i = 0; i < pmb_nr; i++) {
1063 if (got_match[i]) {
1064 /* Advance to the next line */
1065 pmb[i].match = pmb[i].match->next_line;
1066 } else {
1067 moved_block_clear(&pmb[i]);
1068 }
1069 }
1070
1071 free(got_match);
1072 }
1073
1074 static int shrink_potential_moved_blocks(struct moved_block *pmb,
1075 int pmb_nr)
1076 {
1077 int lp, rp;
1078
1079 /* Shrink the set of potential block to the remaining running */
1080 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
1081 while (lp < pmb_nr && pmb[lp].match)
1082 lp++;
1083 /* lp points at the first NULL now */
1084
1085 while (rp > -1 && !pmb[rp].match)
1086 rp--;
1087 /* rp points at the last non-NULL */
1088
1089 if (lp < pmb_nr && rp > -1 && lp < rp) {
1090 pmb[lp] = pmb[rp];
1091 memset(&pmb[rp], 0, sizeof(pmb[rp]));
1092 rp--;
1093 lp++;
1094 }
1095 }
1096
1097 /* Remember the number of running sets */
1098 return rp + 1;
1099 }
1100
1101 /*
1102 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1103 *
1104 * Otherwise, if the last block has fewer alphanumeric characters than
1105 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1106 * that block.
1107 *
1108 * The last block consists of the (n - block_length)'th line up to but not
1109 * including the nth line.
1110 *
1111 * Returns 0 if the last block is empty or is unset by this function, non zero
1112 * otherwise.
1113 *
1114 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1115 * Think of a way to unify them.
1116 */
1117 static int adjust_last_block(struct diff_options *o, int n, int block_length)
1118 {
1119 int i, alnum_count = 0;
1120 if (o->color_moved == COLOR_MOVED_PLAIN)
1121 return block_length;
1122 for (i = 1; i < block_length + 1; i++) {
1123 const char *c = o->emitted_symbols->buf[n - i].line;
1124 for (; *c; c++) {
1125 if (!isalnum(*c))
1126 continue;
1127 alnum_count++;
1128 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1129 return 1;
1130 }
1131 }
1132 for (i = 1; i < block_length + 1; i++)
1133 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1134 return 0;
1135 }
1136
1137 /* Find blocks of moved code, delegate actual coloring decision to helper */
1138 static void mark_color_as_moved(struct diff_options *o,
1139 struct hashmap *add_lines,
1140 struct hashmap *del_lines)
1141 {
1142 struct moved_block *pmb = NULL; /* potentially moved blocks */
1143 int pmb_nr = 0, pmb_alloc = 0;
1144 int n, flipped_block = 0, block_length = 0;
1145
1146
1147 for (n = 0; n < o->emitted_symbols->nr; n++) {
1148 struct hashmap *hm = NULL;
1149 struct moved_entry *key;
1150 struct moved_entry *match = NULL;
1151 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1152 enum diff_symbol last_symbol = 0;
1153
1154 switch (l->s) {
1155 case DIFF_SYMBOL_PLUS:
1156 hm = del_lines;
1157 key = prepare_entry(o, n);
1158 match = hashmap_get_entry(hm, key, ent, NULL);
1159 free(key);
1160 break;
1161 case DIFF_SYMBOL_MINUS:
1162 hm = add_lines;
1163 key = prepare_entry(o, n);
1164 match = hashmap_get_entry(hm, key, ent, NULL);
1165 free(key);
1166 break;
1167 default:
1168 flipped_block = 0;
1169 }
1170
1171 if (!match) {
1172 int i;
1173
1174 adjust_last_block(o, n, block_length);
1175 for(i = 0; i < pmb_nr; i++)
1176 moved_block_clear(&pmb[i]);
1177 pmb_nr = 0;
1178 block_length = 0;
1179 flipped_block = 0;
1180 last_symbol = l->s;
1181 continue;
1182 }
1183
1184 if (o->color_moved == COLOR_MOVED_PLAIN) {
1185 last_symbol = l->s;
1186 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1187 continue;
1188 }
1189
1190 if (o->color_moved_ws_handling &
1191 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1192 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1193 else
1194 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1195
1196 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1197
1198 if (pmb_nr == 0) {
1199 /*
1200 * The current line is the start of a new block.
1201 * Setup the set of potential blocks.
1202 */
1203 hashmap_for_each_entry_from(hm, match, ent) {
1204 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1205 if (o->color_moved_ws_handling &
1206 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1207 if (compute_ws_delta(l, match->es,
1208 &pmb[pmb_nr].wsd))
1209 pmb[pmb_nr++].match = match;
1210 } else {
1211 pmb[pmb_nr].wsd = 0;
1212 pmb[pmb_nr++].match = match;
1213 }
1214 }
1215
1216 if (adjust_last_block(o, n, block_length) &&
1217 pmb_nr && last_symbol != l->s)
1218 flipped_block = (flipped_block + 1) % 2;
1219 else
1220 flipped_block = 0;
1221
1222 block_length = 0;
1223 }
1224
1225 if (pmb_nr) {
1226 block_length++;
1227 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1228 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1229 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1230 }
1231 last_symbol = l->s;
1232 }
1233 adjust_last_block(o, n, block_length);
1234
1235 for(n = 0; n < pmb_nr; n++)
1236 moved_block_clear(&pmb[n]);
1237 free(pmb);
1238 }
1239
1240 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1241 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1242 static void dim_moved_lines(struct diff_options *o)
1243 {
1244 int n;
1245 for (n = 0; n < o->emitted_symbols->nr; n++) {
1246 struct emitted_diff_symbol *prev = (n != 0) ?
1247 &o->emitted_symbols->buf[n - 1] : NULL;
1248 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1249 struct emitted_diff_symbol *next =
1250 (n < o->emitted_symbols->nr - 1) ?
1251 &o->emitted_symbols->buf[n + 1] : NULL;
1252
1253 /* Not a plus or minus line? */
1254 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1255 continue;
1256
1257 /* Not a moved line? */
1258 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1259 continue;
1260
1261 /*
1262 * If prev or next are not a plus or minus line,
1263 * pretend they don't exist
1264 */
1265 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1266 prev->s != DIFF_SYMBOL_MINUS)
1267 prev = NULL;
1268 if (next && next->s != DIFF_SYMBOL_PLUS &&
1269 next->s != DIFF_SYMBOL_MINUS)
1270 next = NULL;
1271
1272 /* Inside a block? */
1273 if ((prev &&
1274 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1275 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1276 (next &&
1277 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1278 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1279 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1280 continue;
1281 }
1282
1283 /* Check if we are at an interesting bound: */
1284 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1285 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1286 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1287 continue;
1288 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1289 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1290 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1291 continue;
1292
1293 /*
1294 * The boundary to prev and next are not interesting,
1295 * so this line is not interesting as a whole
1296 */
1297 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1298 }
1299 }
1300
1301 static void emit_line_ws_markup(struct diff_options *o,
1302 const char *set_sign, const char *set,
1303 const char *reset,
1304 int sign_index, const char *line, int len,
1305 unsigned ws_rule, int blank_at_eof)
1306 {
1307 const char *ws = NULL;
1308 int sign = o->output_indicators[sign_index];
1309
1310 if (o->ws_error_highlight & ws_rule) {
1311 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1312 if (!*ws)
1313 ws = NULL;
1314 }
1315
1316 if (!ws && !set_sign)
1317 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1318 else if (!ws) {
1319 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1320 } else if (blank_at_eof)
1321 /* Blank line at EOF - paint '+' as well */
1322 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1323 else {
1324 /* Emit just the prefix, then the rest. */
1325 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1326 sign, "", 0);
1327 ws_check_emit(line, len, ws_rule,
1328 o->file, set, reset, ws);
1329 }
1330 }
1331
1332 static void emit_diff_symbol_from_struct(struct diff_options *o,
1333 struct emitted_diff_symbol *eds)
1334 {
1335 static const char *nneof = " No newline at end of file\n";
1336 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1337 struct strbuf sb = STRBUF_INIT;
1338
1339 enum diff_symbol s = eds->s;
1340 const char *line = eds->line;
1341 int len = eds->len;
1342 unsigned flags = eds->flags;
1343
1344 switch (s) {
1345 case DIFF_SYMBOL_NO_LF_EOF:
1346 context = diff_get_color_opt(o, DIFF_CONTEXT);
1347 reset = diff_get_color_opt(o, DIFF_RESET);
1348 putc('\n', o->file);
1349 emit_line_0(o, context, NULL, 0, reset, '\\',
1350 nneof, strlen(nneof));
1351 break;
1352 case DIFF_SYMBOL_SUBMODULE_HEADER:
1353 case DIFF_SYMBOL_SUBMODULE_ERROR:
1354 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1355 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1356 case DIFF_SYMBOL_SUMMARY:
1357 case DIFF_SYMBOL_STATS_LINE:
1358 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1359 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1360 emit_line(o, "", "", line, len);
1361 break;
1362 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1363 case DIFF_SYMBOL_CONTEXT_MARKER:
1364 context = diff_get_color_opt(o, DIFF_CONTEXT);
1365 reset = diff_get_color_opt(o, DIFF_RESET);
1366 emit_line(o, context, reset, line, len);
1367 break;
1368 case DIFF_SYMBOL_SEPARATOR:
1369 fprintf(o->file, "%s%c",
1370 diff_line_prefix(o),
1371 o->line_termination);
1372 break;
1373 case DIFF_SYMBOL_CONTEXT:
1374 set = diff_get_color_opt(o, DIFF_CONTEXT);
1375 reset = diff_get_color_opt(o, DIFF_RESET);
1376 set_sign = NULL;
1377 if (o->flags.dual_color_diffed_diffs) {
1378 char c = !len ? 0 : line[0];
1379
1380 if (c == '+')
1381 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1382 else if (c == '@')
1383 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1384 else if (c == '-')
1385 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1386 }
1387 emit_line_ws_markup(o, set_sign, set, reset,
1388 OUTPUT_INDICATOR_CONTEXT, line, len,
1389 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1390 break;
1391 case DIFF_SYMBOL_PLUS:
1392 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1393 DIFF_SYMBOL_MOVED_LINE_ALT |
1394 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1395 case DIFF_SYMBOL_MOVED_LINE |
1396 DIFF_SYMBOL_MOVED_LINE_ALT |
1397 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1398 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1399 break;
1400 case DIFF_SYMBOL_MOVED_LINE |
1401 DIFF_SYMBOL_MOVED_LINE_ALT:
1402 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1403 break;
1404 case DIFF_SYMBOL_MOVED_LINE |
1405 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1406 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1407 break;
1408 case DIFF_SYMBOL_MOVED_LINE:
1409 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1410 break;
1411 default:
1412 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1413 }
1414 reset = diff_get_color_opt(o, DIFF_RESET);
1415 if (!o->flags.dual_color_diffed_diffs)
1416 set_sign = NULL;
1417 else {
1418 char c = !len ? 0 : line[0];
1419
1420 set_sign = set;
1421 if (c == '-')
1422 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1423 else if (c == '@')
1424 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1425 else if (c == '+')
1426 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1427 else
1428 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1429 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1430 }
1431 emit_line_ws_markup(o, set_sign, set, reset,
1432 OUTPUT_INDICATOR_NEW, line, len,
1433 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1434 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1435 break;
1436 case DIFF_SYMBOL_MINUS:
1437 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1438 DIFF_SYMBOL_MOVED_LINE_ALT |
1439 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1440 case DIFF_SYMBOL_MOVED_LINE |
1441 DIFF_SYMBOL_MOVED_LINE_ALT |
1442 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1443 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1444 break;
1445 case DIFF_SYMBOL_MOVED_LINE |
1446 DIFF_SYMBOL_MOVED_LINE_ALT:
1447 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1448 break;
1449 case DIFF_SYMBOL_MOVED_LINE |
1450 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1451 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1452 break;
1453 case DIFF_SYMBOL_MOVED_LINE:
1454 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1455 break;
1456 default:
1457 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1458 }
1459 reset = diff_get_color_opt(o, DIFF_RESET);
1460 if (!o->flags.dual_color_diffed_diffs)
1461 set_sign = NULL;
1462 else {
1463 char c = !len ? 0 : line[0];
1464
1465 set_sign = set;
1466 if (c == '+')
1467 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1468 else if (c == '@')
1469 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1470 else if (c == '-')
1471 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1472 else
1473 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1474 }
1475 emit_line_ws_markup(o, set_sign, set, reset,
1476 OUTPUT_INDICATOR_OLD, line, len,
1477 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1478 break;
1479 case DIFF_SYMBOL_WORDS_PORCELAIN:
1480 context = diff_get_color_opt(o, DIFF_CONTEXT);
1481 reset = diff_get_color_opt(o, DIFF_RESET);
1482 emit_line(o, context, reset, line, len);
1483 fputs("~\n", o->file);
1484 break;
1485 case DIFF_SYMBOL_WORDS:
1486 context = diff_get_color_opt(o, DIFF_CONTEXT);
1487 reset = diff_get_color_opt(o, DIFF_RESET);
1488 /*
1489 * Skip the prefix character, if any. With
1490 * diff_suppress_blank_empty, there may be
1491 * none.
1492 */
1493 if (line[0] != '\n') {
1494 line++;
1495 len--;
1496 }
1497 emit_line(o, context, reset, line, len);
1498 break;
1499 case DIFF_SYMBOL_FILEPAIR_PLUS:
1500 meta = diff_get_color_opt(o, DIFF_METAINFO);
1501 reset = diff_get_color_opt(o, DIFF_RESET);
1502 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1503 line, reset,
1504 strchr(line, ' ') ? "\t" : "");
1505 break;
1506 case DIFF_SYMBOL_FILEPAIR_MINUS:
1507 meta = diff_get_color_opt(o, DIFF_METAINFO);
1508 reset = diff_get_color_opt(o, DIFF_RESET);
1509 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1510 line, reset,
1511 strchr(line, ' ') ? "\t" : "");
1512 break;
1513 case DIFF_SYMBOL_BINARY_FILES:
1514 case DIFF_SYMBOL_HEADER:
1515 fprintf(o->file, "%s", line);
1516 break;
1517 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1518 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1519 break;
1520 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1521 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1522 break;
1523 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1524 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1525 break;
1526 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1527 fputs(diff_line_prefix(o), o->file);
1528 fputc('\n', o->file);
1529 break;
1530 case DIFF_SYMBOL_REWRITE_DIFF:
1531 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1532 reset = diff_get_color_opt(o, DIFF_RESET);
1533 emit_line(o, fraginfo, reset, line, len);
1534 break;
1535 case DIFF_SYMBOL_SUBMODULE_ADD:
1536 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1537 reset = diff_get_color_opt(o, DIFF_RESET);
1538 emit_line(o, set, reset, line, len);
1539 break;
1540 case DIFF_SYMBOL_SUBMODULE_DEL:
1541 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1542 reset = diff_get_color_opt(o, DIFF_RESET);
1543 emit_line(o, set, reset, line, len);
1544 break;
1545 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1546 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1547 diff_line_prefix(o), line);
1548 break;
1549 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1550 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1551 diff_line_prefix(o), line);
1552 break;
1553 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1554 emit_line(o, "", "", " 0 files changed\n",
1555 strlen(" 0 files changed\n"));
1556 break;
1557 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1558 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1559 break;
1560 case DIFF_SYMBOL_WORD_DIFF:
1561 fprintf(o->file, "%.*s", len, line);
1562 break;
1563 case DIFF_SYMBOL_STAT_SEP:
1564 fputs(o->stat_sep, o->file);
1565 break;
1566 default:
1567 BUG("unknown diff symbol");
1568 }
1569 strbuf_release(&sb);
1570 }
1571
1572 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1573 const char *line, int len, unsigned flags)
1574 {
1575 struct emitted_diff_symbol e = {line, len, flags, 0, 0, s};
1576
1577 if (o->emitted_symbols)
1578 append_emitted_diff_symbol(o, &e);
1579 else
1580 emit_diff_symbol_from_struct(o, &e);
1581 }
1582
1583 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1584 {
1585 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1586 }
1587
1588 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1589 {
1590 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1591 }
1592
1593 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1594 {
1595 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1596 path, strlen(path), 0);
1597 }
1598
1599 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1600 {
1601 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1602 path, strlen(path), 0);
1603 }
1604
1605 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1606 {
1607 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1608 header, strlen(header), 0);
1609 }
1610
1611 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1612 {
1613 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1614 }
1615
1616 void diff_emit_submodule_pipethrough(struct diff_options *o,
1617 const char *line, int len)
1618 {
1619 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1620 }
1621
1622 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1623 {
1624 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1625 ecbdata->blank_at_eof_in_preimage &&
1626 ecbdata->blank_at_eof_in_postimage &&
1627 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1628 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1629 return 0;
1630 return ws_blank_line(line, len, ecbdata->ws_rule);
1631 }
1632
1633 static void emit_add_line(struct emit_callback *ecbdata,
1634 const char *line, int len)
1635 {
1636 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1637 if (new_blank_line_at_eof(ecbdata, line, len))
1638 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1639
1640 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1641 }
1642
1643 static void emit_del_line(struct emit_callback *ecbdata,
1644 const char *line, int len)
1645 {
1646 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1647 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1648 }
1649
1650 static void emit_context_line(struct emit_callback *ecbdata,
1651 const char *line, int len)
1652 {
1653 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1654 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1655 }
1656
1657 static void emit_hunk_header(struct emit_callback *ecbdata,
1658 const char *line, int len)
1659 {
1660 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1661 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1662 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1663 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1664 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1665 static const char atat[2] = { '@', '@' };
1666 const char *cp, *ep;
1667 struct strbuf msgbuf = STRBUF_INIT;
1668 int org_len = len;
1669 int i = 1;
1670
1671 /*
1672 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1673 * it always is at least 10 bytes long.
1674 */
1675 if (len < 10 ||
1676 memcmp(line, atat, 2) ||
1677 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1678 emit_diff_symbol(ecbdata->opt,
1679 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1680 return;
1681 }
1682 ep += 2; /* skip over @@ */
1683
1684 /* The hunk header in fraginfo color */
1685 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1686 strbuf_addstr(&msgbuf, reverse);
1687 strbuf_addstr(&msgbuf, frag);
1688 if (ecbdata->opt->flags.suppress_hunk_header_line_count)
1689 strbuf_add(&msgbuf, atat, sizeof(atat));
1690 else
1691 strbuf_add(&msgbuf, line, ep - line);
1692 strbuf_addstr(&msgbuf, reset);
1693
1694 /*
1695 * trailing "\r\n"
1696 */
1697 for ( ; i < 3; i++)
1698 if (line[len - i] == '\r' || line[len - i] == '\n')
1699 len--;
1700
1701 /* blank before the func header */
1702 for (cp = ep; ep - line < len; ep++)
1703 if (*ep != ' ' && *ep != '\t')
1704 break;
1705 if (ep != cp) {
1706 strbuf_addstr(&msgbuf, context);
1707 strbuf_add(&msgbuf, cp, ep - cp);
1708 strbuf_addstr(&msgbuf, reset);
1709 }
1710
1711 if (ep < line + len) {
1712 strbuf_addstr(&msgbuf, func);
1713 strbuf_add(&msgbuf, ep, line + len - ep);
1714 strbuf_addstr(&msgbuf, reset);
1715 }
1716
1717 strbuf_add(&msgbuf, line + len, org_len - len);
1718 strbuf_complete_line(&msgbuf);
1719 emit_diff_symbol(ecbdata->opt,
1720 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1721 strbuf_release(&msgbuf);
1722 }
1723
1724 static struct diff_tempfile *claim_diff_tempfile(void)
1725 {
1726 int i;
1727 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1728 if (!diff_temp[i].name)
1729 return diff_temp + i;
1730 BUG("diff is failing to clean up its tempfiles");
1731 }
1732
1733 static void remove_tempfile(void)
1734 {
1735 int i;
1736 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1737 if (is_tempfile_active(diff_temp[i].tempfile))
1738 delete_tempfile(&diff_temp[i].tempfile);
1739 diff_temp[i].name = NULL;
1740 }
1741 }
1742
1743 static void add_line_count(struct strbuf *out, int count)
1744 {
1745 switch (count) {
1746 case 0:
1747 strbuf_addstr(out, "0,0");
1748 break;
1749 case 1:
1750 strbuf_addstr(out, "1");
1751 break;
1752 default:
1753 strbuf_addf(out, "1,%d", count);
1754 break;
1755 }
1756 }
1757
1758 static void emit_rewrite_lines(struct emit_callback *ecb,
1759 int prefix, const char *data, int size)
1760 {
1761 const char *endp = NULL;
1762
1763 while (0 < size) {
1764 int len;
1765
1766 endp = memchr(data, '\n', size);
1767 len = endp ? (endp - data + 1) : size;
1768 if (prefix != '+') {
1769 ecb->lno_in_preimage++;
1770 emit_del_line(ecb, data, len);
1771 } else {
1772 ecb->lno_in_postimage++;
1773 emit_add_line(ecb, data, len);
1774 }
1775 size -= len;
1776 data += len;
1777 }
1778 if (!endp)
1779 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1780 }
1781
1782 static void emit_rewrite_diff(const char *name_a,
1783 const char *name_b,
1784 struct diff_filespec *one,
1785 struct diff_filespec *two,
1786 struct userdiff_driver *textconv_one,
1787 struct userdiff_driver *textconv_two,
1788 struct diff_options *o)
1789 {
1790 int lc_a, lc_b;
1791 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1792 const char *a_prefix, *b_prefix;
1793 char *data_one, *data_two;
1794 size_t size_one, size_two;
1795 struct emit_callback ecbdata;
1796 struct strbuf out = STRBUF_INIT;
1797
1798 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1799 a_prefix = o->b_prefix;
1800 b_prefix = o->a_prefix;
1801 } else {
1802 a_prefix = o->a_prefix;
1803 b_prefix = o->b_prefix;
1804 }
1805
1806 name_a += (*name_a == '/');
1807 name_b += (*name_b == '/');
1808
1809 strbuf_reset(&a_name);
1810 strbuf_reset(&b_name);
1811 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1812 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1813
1814 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1815 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1816
1817 memset(&ecbdata, 0, sizeof(ecbdata));
1818 ecbdata.color_diff = want_color(o->use_color);
1819 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1820 ecbdata.opt = o;
1821 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1822 mmfile_t mf1, mf2;
1823 mf1.ptr = (char *)data_one;
1824 mf2.ptr = (char *)data_two;
1825 mf1.size = size_one;
1826 mf2.size = size_two;
1827 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1828 }
1829 ecbdata.lno_in_preimage = 1;
1830 ecbdata.lno_in_postimage = 1;
1831
1832 lc_a = count_lines(data_one, size_one);
1833 lc_b = count_lines(data_two, size_two);
1834
1835 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1836 a_name.buf, a_name.len, 0);
1837 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1838 b_name.buf, b_name.len, 0);
1839
1840 strbuf_addstr(&out, "@@ -");
1841 if (!o->irreversible_delete)
1842 add_line_count(&out, lc_a);
1843 else
1844 strbuf_addstr(&out, "?,?");
1845 strbuf_addstr(&out, " +");
1846 add_line_count(&out, lc_b);
1847 strbuf_addstr(&out, " @@\n");
1848 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1849 strbuf_release(&out);
1850
1851 if (lc_a && !o->irreversible_delete)
1852 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1853 if (lc_b)
1854 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1855 if (textconv_one)
1856 free((char *)data_one);
1857 if (textconv_two)
1858 free((char *)data_two);
1859 }
1860
1861 struct diff_words_buffer {
1862 mmfile_t text;
1863 unsigned long alloc;
1864 struct diff_words_orig {
1865 const char *begin, *end;
1866 } *orig;
1867 int orig_nr, orig_alloc;
1868 };
1869
1870 static void diff_words_append(char *line, unsigned long len,
1871 struct diff_words_buffer *buffer)
1872 {
1873 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1874 line++;
1875 len--;
1876 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1877 buffer->text.size += len;
1878 buffer->text.ptr[buffer->text.size] = '\0';
1879 }
1880
1881 struct diff_words_style_elem {
1882 const char *prefix;
1883 const char *suffix;
1884 const char *color; /* NULL; filled in by the setup code if
1885 * color is enabled */
1886 };
1887
1888 struct diff_words_style {
1889 enum diff_words_type type;
1890 struct diff_words_style_elem new_word, old_word, ctx;
1891 const char *newline;
1892 };
1893
1894 static struct diff_words_style diff_words_styles[] = {
1895 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1896 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1897 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1898 };
1899
1900 struct diff_words_data {
1901 struct diff_words_buffer minus, plus;
1902 const char *current_plus;
1903 int last_minus;
1904 struct diff_options *opt;
1905 regex_t *word_regex;
1906 enum diff_words_type type;
1907 struct diff_words_style *style;
1908 };
1909
1910 static int fn_out_diff_words_write_helper(struct diff_options *o,
1911 struct diff_words_style_elem *st_el,
1912 const char *newline,
1913 size_t count, const char *buf)
1914 {
1915 int print = 0;
1916 struct strbuf sb = STRBUF_INIT;
1917
1918 while (count) {
1919 char *p = memchr(buf, '\n', count);
1920 if (print)
1921 strbuf_addstr(&sb, diff_line_prefix(o));
1922
1923 if (p != buf) {
1924 const char *reset = st_el->color && *st_el->color ?
1925 GIT_COLOR_RESET : NULL;
1926 if (st_el->color && *st_el->color)
1927 strbuf_addstr(&sb, st_el->color);
1928 strbuf_addstr(&sb, st_el->prefix);
1929 strbuf_add(&sb, buf, p ? p - buf : count);
1930 strbuf_addstr(&sb, st_el->suffix);
1931 if (reset)
1932 strbuf_addstr(&sb, reset);
1933 }
1934 if (!p)
1935 goto out;
1936
1937 strbuf_addstr(&sb, newline);
1938 count -= p + 1 - buf;
1939 buf = p + 1;
1940 print = 1;
1941 if (count) {
1942 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1943 sb.buf, sb.len, 0);
1944 strbuf_reset(&sb);
1945 }
1946 }
1947
1948 out:
1949 if (sb.len)
1950 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1951 sb.buf, sb.len, 0);
1952 strbuf_release(&sb);
1953 return 0;
1954 }
1955
1956 /*
1957 * '--color-words' algorithm can be described as:
1958 *
1959 * 1. collect the minus/plus lines of a diff hunk, divided into
1960 * minus-lines and plus-lines;
1961 *
1962 * 2. break both minus-lines and plus-lines into words and
1963 * place them into two mmfile_t with one word for each line;
1964 *
1965 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1966 *
1967 * And for the common parts of the both file, we output the plus side text.
1968 * diff_words->current_plus is used to trace the current position of the plus file
1969 * which printed. diff_words->last_minus is used to trace the last minus word
1970 * printed.
1971 *
1972 * For '--graph' to work with '--color-words', we need to output the graph prefix
1973 * on each line of color words output. Generally, there are two conditions on
1974 * which we should output the prefix.
1975 *
1976 * 1. diff_words->last_minus == 0 &&
1977 * diff_words->current_plus == diff_words->plus.text.ptr
1978 *
1979 * that is: the plus text must start as a new line, and if there is no minus
1980 * word printed, a graph prefix must be printed.
1981 *
1982 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1983 * *(diff_words->current_plus - 1) == '\n'
1984 *
1985 * that is: a graph prefix must be printed following a '\n'
1986 */
1987 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1988 {
1989 if ((diff_words->last_minus == 0 &&
1990 diff_words->current_plus == diff_words->plus.text.ptr) ||
1991 (diff_words->current_plus > diff_words->plus.text.ptr &&
1992 *(diff_words->current_plus - 1) == '\n')) {
1993 return 1;
1994 } else {
1995 return 0;
1996 }
1997 }
1998
1999 static void fn_out_diff_words_aux(void *priv,
2000 long minus_first, long minus_len,
2001 long plus_first, long plus_len,
2002 const char *func, long funclen)
2003 {
2004 struct diff_words_data *diff_words = priv;
2005 struct diff_words_style *style = diff_words->style;
2006 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
2007 struct diff_options *opt = diff_words->opt;
2008 const char *line_prefix;
2009
2010 assert(opt);
2011 line_prefix = diff_line_prefix(opt);
2012
2013 /* POSIX requires that first be decremented by one if len == 0... */
2014 if (minus_len) {
2015 minus_begin = diff_words->minus.orig[minus_first].begin;
2016 minus_end =
2017 diff_words->minus.orig[minus_first + minus_len - 1].end;
2018 } else
2019 minus_begin = minus_end =
2020 diff_words->minus.orig[minus_first].end;
2021
2022 if (plus_len) {
2023 plus_begin = diff_words->plus.orig[plus_first].begin;
2024 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
2025 } else
2026 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
2027
2028 if (color_words_output_graph_prefix(diff_words)) {
2029 fputs(line_prefix, diff_words->opt->file);
2030 }
2031 if (diff_words->current_plus != plus_begin) {
2032 fn_out_diff_words_write_helper(diff_words->opt,
2033 &style->ctx, style->newline,
2034 plus_begin - diff_words->current_plus,
2035 diff_words->current_plus);
2036 }
2037 if (minus_begin != minus_end) {
2038 fn_out_diff_words_write_helper(diff_words->opt,
2039 &style->old_word, style->newline,
2040 minus_end - minus_begin, minus_begin);
2041 }
2042 if (plus_begin != plus_end) {
2043 fn_out_diff_words_write_helper(diff_words->opt,
2044 &style->new_word, style->newline,
2045 plus_end - plus_begin, plus_begin);
2046 }
2047
2048 diff_words->current_plus = plus_end;
2049 diff_words->last_minus = minus_first;
2050 }
2051
2052 /* This function starts looking at *begin, and returns 0 iff a word was found. */
2053 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
2054 int *begin, int *end)
2055 {
2056 while (word_regex && *begin < buffer->size) {
2057 regmatch_t match[1];
2058 if (!regexec_buf(word_regex, buffer->ptr + *begin,
2059 buffer->size - *begin, 1, match, 0)) {
2060 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
2061 '\n', match[0].rm_eo - match[0].rm_so);
2062 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
2063 *begin += match[0].rm_so;
2064 if (*begin == *end)
2065 (*begin)++;
2066 else
2067 return *begin > *end;
2068 } else {
2069 return -1;
2070 }
2071 }
2072
2073 /* find the next word */
2074 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2075 (*begin)++;
2076 if (*begin >= buffer->size)
2077 return -1;
2078
2079 /* find the end of the word */
2080 *end = *begin + 1;
2081 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2082 (*end)++;
2083
2084 return 0;
2085 }
2086
2087 /*
2088 * This function splits the words in buffer->text, stores the list with
2089 * newline separator into out, and saves the offsets of the original words
2090 * in buffer->orig.
2091 */
2092 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2093 regex_t *word_regex)
2094 {
2095 int i, j;
2096 long alloc = 0;
2097
2098 out->size = 0;
2099 out->ptr = NULL;
2100
2101 /* fake an empty "0th" word */
2102 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2103 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2104 buffer->orig_nr = 1;
2105
2106 for (i = 0; i < buffer->text.size; i++) {
2107 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2108 return;
2109
2110 /* store original boundaries */
2111 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2112 buffer->orig_alloc);
2113 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2114 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2115 buffer->orig_nr++;
2116
2117 /* store one word */
2118 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2119 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2120 out->ptr[out->size + j - i] = '\n';
2121 out->size += j - i + 1;
2122
2123 i = j - 1;
2124 }
2125 }
2126
2127 /* this executes the word diff on the accumulated buffers */
2128 static void diff_words_show(struct diff_words_data *diff_words)
2129 {
2130 xpparam_t xpp;
2131 xdemitconf_t xecfg;
2132 mmfile_t minus, plus;
2133 struct diff_words_style *style = diff_words->style;
2134
2135 struct diff_options *opt = diff_words->opt;
2136 const char *line_prefix;
2137
2138 assert(opt);
2139 line_prefix = diff_line_prefix(opt);
2140
2141 /* special case: only removal */
2142 if (!diff_words->plus.text.size) {
2143 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2144 line_prefix, strlen(line_prefix), 0);
2145 fn_out_diff_words_write_helper(diff_words->opt,
2146 &style->old_word, style->newline,
2147 diff_words->minus.text.size,
2148 diff_words->minus.text.ptr);
2149 diff_words->minus.text.size = 0;
2150 return;
2151 }
2152
2153 diff_words->current_plus = diff_words->plus.text.ptr;
2154 diff_words->last_minus = 0;
2155
2156 memset(&xpp, 0, sizeof(xpp));
2157 memset(&xecfg, 0, sizeof(xecfg));
2158 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2159 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2160 xpp.flags = 0;
2161 /* as only the hunk header will be parsed, we need a 0-context */
2162 xecfg.ctxlen = 0;
2163 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2164 diff_words, &xpp, &xecfg))
2165 die("unable to generate word diff");
2166 free(minus.ptr);
2167 free(plus.ptr);
2168 if (diff_words->current_plus != diff_words->plus.text.ptr +
2169 diff_words->plus.text.size) {
2170 if (color_words_output_graph_prefix(diff_words))
2171 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2172 line_prefix, strlen(line_prefix), 0);
2173 fn_out_diff_words_write_helper(diff_words->opt,
2174 &style->ctx, style->newline,
2175 diff_words->plus.text.ptr + diff_words->plus.text.size
2176 - diff_words->current_plus, diff_words->current_plus);
2177 }
2178 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2179 }
2180
2181 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2182 static void diff_words_flush(struct emit_callback *ecbdata)
2183 {
2184 struct diff_options *wo = ecbdata->diff_words->opt;
2185
2186 if (ecbdata->diff_words->minus.text.size ||
2187 ecbdata->diff_words->plus.text.size)
2188 diff_words_show(ecbdata->diff_words);
2189
2190 if (wo->emitted_symbols) {
2191 struct diff_options *o = ecbdata->opt;
2192 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2193 int i;
2194
2195 /*
2196 * NEEDSWORK:
2197 * Instead of appending each, concat all words to a line?
2198 */
2199 for (i = 0; i < wol->nr; i++)
2200 append_emitted_diff_symbol(o, &wol->buf[i]);
2201
2202 for (i = 0; i < wol->nr; i++)
2203 free((void *)wol->buf[i].line);
2204
2205 wol->nr = 0;
2206 }
2207 }
2208
2209 static void diff_filespec_load_driver(struct diff_filespec *one,
2210 struct index_state *istate)
2211 {
2212 /* Use already-loaded driver */
2213 if (one->driver)
2214 return;
2215
2216 if (S_ISREG(one->mode))
2217 one->driver = userdiff_find_by_path(istate, one->path);
2218
2219 /* Fallback to default settings */
2220 if (!one->driver)
2221 one->driver = userdiff_find_by_name("default");
2222 }
2223
2224 static const char *userdiff_word_regex(struct diff_filespec *one,
2225 struct index_state *istate)
2226 {
2227 diff_filespec_load_driver(one, istate);
2228 return one->driver->word_regex;
2229 }
2230
2231 static void init_diff_words_data(struct emit_callback *ecbdata,
2232 struct diff_options *orig_opts,
2233 struct diff_filespec *one,
2234 struct diff_filespec *two)
2235 {
2236 int i;
2237 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2238 memcpy(o, orig_opts, sizeof(struct diff_options));
2239
2240 CALLOC_ARRAY(ecbdata->diff_words, 1);
2241 ecbdata->diff_words->type = o->word_diff;
2242 ecbdata->diff_words->opt = o;
2243
2244 if (orig_opts->emitted_symbols)
2245 CALLOC_ARRAY(o->emitted_symbols, 1);
2246
2247 if (!o->word_regex)
2248 o->word_regex = userdiff_word_regex(one, o->repo->index);
2249 if (!o->word_regex)
2250 o->word_regex = userdiff_word_regex(two, o->repo->index);
2251 if (!o->word_regex)
2252 o->word_regex = diff_word_regex_cfg;
2253 if (o->word_regex) {
2254 ecbdata->diff_words->word_regex = (regex_t *)
2255 xmalloc(sizeof(regex_t));
2256 if (regcomp(ecbdata->diff_words->word_regex,
2257 o->word_regex,
2258 REG_EXTENDED | REG_NEWLINE))
2259 die("invalid regular expression: %s",
2260 o->word_regex);
2261 }
2262 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2263 if (o->word_diff == diff_words_styles[i].type) {
2264 ecbdata->diff_words->style =
2265 &diff_words_styles[i];
2266 break;
2267 }
2268 }
2269 if (want_color(o->use_color)) {
2270 struct diff_words_style *st = ecbdata->diff_words->style;
2271 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2272 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2273 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2274 }
2275 }
2276
2277 static void free_diff_words_data(struct emit_callback *ecbdata)
2278 {
2279 if (ecbdata->diff_words) {
2280 diff_words_flush(ecbdata);
2281 free (ecbdata->diff_words->opt->emitted_symbols);
2282 free (ecbdata->diff_words->opt);
2283 free (ecbdata->diff_words->minus.text.ptr);
2284 free (ecbdata->diff_words->minus.orig);
2285 free (ecbdata->diff_words->plus.text.ptr);
2286 free (ecbdata->diff_words->plus.orig);
2287 if (ecbdata->diff_words->word_regex) {
2288 regfree(ecbdata->diff_words->word_regex);
2289 free(ecbdata->diff_words->word_regex);
2290 }
2291 FREE_AND_NULL(ecbdata->diff_words);
2292 }
2293 }
2294
2295 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2296 {
2297 if (want_color(diff_use_color))
2298 return diff_colors[ix];
2299 return "";
2300 }
2301
2302 const char *diff_line_prefix(struct diff_options *opt)
2303 {
2304 struct strbuf *msgbuf;
2305 if (!opt->output_prefix)
2306 return "";
2307
2308 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2309 return msgbuf->buf;
2310 }
2311
2312 static unsigned long sane_truncate_line(char *line, unsigned long len)
2313 {
2314 const char *cp;
2315 unsigned long allot;
2316 size_t l = len;
2317
2318 cp = line;
2319 allot = l;
2320 while (0 < l) {
2321 (void) utf8_width(&cp, &l);
2322 if (!cp)
2323 break; /* truncated in the middle? */
2324 }
2325 return allot - l;
2326 }
2327
2328 static void find_lno(const char *line, struct emit_callback *ecbdata)
2329 {
2330 const char *p;
2331 ecbdata->lno_in_preimage = 0;
2332 ecbdata->lno_in_postimage = 0;
2333 p = strchr(line, '-');
2334 if (!p)
2335 return; /* cannot happen */
2336 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2337 p = strchr(p, '+');
2338 if (!p)
2339 return; /* cannot happen */
2340 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2341 }
2342
2343 static int fn_out_consume(void *priv, char *line, unsigned long len)
2344 {
2345 struct emit_callback *ecbdata = priv;
2346 struct diff_options *o = ecbdata->opt;
2347
2348 o->found_changes = 1;
2349
2350 if (ecbdata->header) {
2351 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2352 ecbdata->header->buf, ecbdata->header->len, 0);
2353 strbuf_reset(ecbdata->header);
2354 ecbdata->header = NULL;
2355 }
2356
2357 if (ecbdata->label_path[0]) {
2358 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2359 ecbdata->label_path[0],
2360 strlen(ecbdata->label_path[0]), 0);
2361 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2362 ecbdata->label_path[1],
2363 strlen(ecbdata->label_path[1]), 0);
2364 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2365 }
2366
2367 if (diff_suppress_blank_empty
2368 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2369 line[0] = '\n';
2370 len = 1;
2371 }
2372
2373 if (line[0] == '@') {
2374 if (ecbdata->diff_words)
2375 diff_words_flush(ecbdata);
2376 len = sane_truncate_line(line, len);
2377 find_lno(line, ecbdata);
2378 emit_hunk_header(ecbdata, line, len);
2379 return 0;
2380 }
2381
2382 if (ecbdata->diff_words) {
2383 enum diff_symbol s =
2384 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2385 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2386 if (line[0] == '-') {
2387 diff_words_append(line, len,
2388 &ecbdata->diff_words->minus);
2389 return 0;
2390 } else if (line[0] == '+') {
2391 diff_words_append(line, len,
2392 &ecbdata->diff_words->plus);
2393 return 0;
2394 } else if (starts_with(line, "\\ ")) {
2395 /*
2396 * Eat the "no newline at eof" marker as if we
2397 * saw a "+" or "-" line with nothing on it,
2398 * and return without diff_words_flush() to
2399 * defer processing. If this is the end of
2400 * preimage, more "+" lines may come after it.
2401 */
2402 return 0;
2403 }
2404 diff_words_flush(ecbdata);
2405 emit_diff_symbol(o, s, line, len, 0);
2406 return 0;
2407 }
2408
2409 switch (line[0]) {
2410 case '+':
2411 ecbdata->lno_in_postimage++;
2412 emit_add_line(ecbdata, line + 1, len - 1);
2413 break;
2414 case '-':
2415 ecbdata->lno_in_preimage++;
2416 emit_del_line(ecbdata, line + 1, len - 1);
2417 break;
2418 case ' ':
2419 ecbdata->lno_in_postimage++;
2420 ecbdata->lno_in_preimage++;
2421 emit_context_line(ecbdata, line + 1, len - 1);
2422 break;
2423 default:
2424 /* incomplete line at the end */
2425 ecbdata->lno_in_preimage++;
2426 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2427 line, len, 0);
2428 break;
2429 }
2430 return 0;
2431 }
2432
2433 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2434 {
2435 const char *old_name = a;
2436 const char *new_name = b;
2437 int pfx_length, sfx_length;
2438 int pfx_adjust_for_slash;
2439 int len_a = strlen(a);
2440 int len_b = strlen(b);
2441 int a_midlen, b_midlen;
2442 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2443 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2444
2445 if (qlen_a || qlen_b) {
2446 quote_c_style(a, name, NULL, 0);
2447 strbuf_addstr(name, " => ");
2448 quote_c_style(b, name, NULL, 0);
2449 return;
2450 }
2451
2452 /* Find common prefix */
2453 pfx_length = 0;
2454 while (*old_name && *new_name && *old_name == *new_name) {
2455 if (*old_name == '/')
2456 pfx_length = old_name - a + 1;
2457 old_name++;
2458 new_name++;
2459 }
2460
2461 /* Find common suffix */
2462 old_name = a + len_a;
2463 new_name = b + len_b;
2464 sfx_length = 0;
2465 /*
2466 * If there is a common prefix, it must end in a slash. In
2467 * that case we let this loop run 1 into the prefix to see the
2468 * same slash.
2469 *
2470 * If there is no common prefix, we cannot do this as it would
2471 * underrun the input strings.
2472 */
2473 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2474 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2475 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2476 *old_name == *new_name) {
2477 if (*old_name == '/')
2478 sfx_length = len_a - (old_name - a);
2479 old_name--;
2480 new_name--;
2481 }
2482
2483 /*
2484 * pfx{mid-a => mid-b}sfx
2485 * {pfx-a => pfx-b}sfx
2486 * pfx{sfx-a => sfx-b}
2487 * name-a => name-b
2488 */
2489 a_midlen = len_a - pfx_length - sfx_length;
2490 b_midlen = len_b - pfx_length - sfx_length;
2491 if (a_midlen < 0)
2492 a_midlen = 0;
2493 if (b_midlen < 0)
2494 b_midlen = 0;
2495
2496 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2497 if (pfx_length + sfx_length) {
2498 strbuf_add(name, a, pfx_length);
2499 strbuf_addch(name, '{');
2500 }
2501 strbuf_add(name, a + pfx_length, a_midlen);
2502 strbuf_addstr(name, " => ");
2503 strbuf_add(name, b + pfx_length, b_midlen);
2504 if (pfx_length + sfx_length) {
2505 strbuf_addch(name, '}');
2506 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2507 }
2508 }
2509
2510 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2511 const char *name_a,
2512 const char *name_b)
2513 {
2514 struct diffstat_file *x;
2515 CALLOC_ARRAY(x, 1);
2516 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2517 diffstat->files[diffstat->nr++] = x;
2518 if (name_b) {
2519 x->from_name = xstrdup(name_a);
2520 x->name = xstrdup(name_b);
2521 x->is_renamed = 1;
2522 }
2523 else {
2524 x->from_name = NULL;
2525 x->name = xstrdup(name_a);
2526 }
2527 return x;
2528 }
2529
2530 static int diffstat_consume(void *priv, char *line, unsigned long len)
2531 {
2532 struct diffstat_t *diffstat = priv;
2533 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2534
2535 if (line[0] == '+')
2536 x->added++;
2537 else if (line[0] == '-')
2538 x->deleted++;
2539 return 0;
2540 }
2541
2542 const char mime_boundary_leader[] = "------------";
2543
2544 static int scale_linear(int it, int width, int max_change)
2545 {
2546 if (!it)
2547 return 0;
2548 /*
2549 * make sure that at least one '-' or '+' is printed if
2550 * there is any change to this path. The easiest way is to
2551 * scale linearly as if the allotted width is one column shorter
2552 * than it is, and then add 1 to the result.
2553 */
2554 return 1 + (it * (width - 1) / max_change);
2555 }
2556
2557 static void show_graph(struct strbuf *out, char ch, int cnt,
2558 const char *set, const char *reset)
2559 {
2560 if (cnt <= 0)
2561 return;
2562 strbuf_addstr(out, set);
2563 strbuf_addchars(out, ch, cnt);
2564 strbuf_addstr(out, reset);
2565 }
2566
2567 static void fill_print_name(struct diffstat_file *file)
2568 {
2569 struct strbuf pname = STRBUF_INIT;
2570
2571 if (file->print_name)
2572 return;
2573
2574 if (file->is_renamed)
2575 pprint_rename(&pname, file->from_name, file->name);
2576 else
2577 quote_c_style(file->name, &pname, NULL, 0);
2578
2579 if (file->comments)
2580 strbuf_addf(&pname, " (%s)", file->comments);
2581
2582 file->print_name = strbuf_detach(&pname, NULL);
2583 }
2584
2585 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2586 int files, int insertions, int deletions)
2587 {
2588 struct strbuf sb = STRBUF_INIT;
2589
2590 if (!files) {
2591 assert(insertions == 0 && deletions == 0);
2592 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2593 NULL, 0, 0);
2594 return;
2595 }
2596
2597 strbuf_addf(&sb,
2598 (files == 1) ? " %d file changed" : " %d files changed",
2599 files);
2600
2601 /*
2602 * For binary diff, the caller may want to print "x files
2603 * changed" with insertions == 0 && deletions == 0.
2604 *
2605 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2606 * is probably less confusing (i.e skip over "2 files changed
2607 * but nothing about added/removed lines? Is this a bug in Git?").
2608 */
2609 if (insertions || deletions == 0) {
2610 strbuf_addf(&sb,
2611 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2612 insertions);
2613 }
2614
2615 if (deletions || insertions == 0) {
2616 strbuf_addf(&sb,
2617 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2618 deletions);
2619 }
2620 strbuf_addch(&sb, '\n');
2621 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2622 sb.buf, sb.len, 0);
2623 strbuf_release(&sb);
2624 }
2625
2626 void print_stat_summary(FILE *fp, int files,
2627 int insertions, int deletions)
2628 {
2629 struct diff_options o;
2630 memset(&o, 0, sizeof(o));
2631 o.file = fp;
2632
2633 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2634 }
2635
2636 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2637 {
2638 int i, len, add, del, adds = 0, dels = 0;
2639 uintmax_t max_change = 0, max_len = 0;
2640 int total_files = data->nr, count;
2641 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2642 const char *reset, *add_c, *del_c;
2643 int extra_shown = 0;
2644 const char *line_prefix = diff_line_prefix(options);
2645 struct strbuf out = STRBUF_INIT;
2646
2647 if (data->nr == 0)
2648 return;
2649
2650 count = options->stat_count ? options->stat_count : data->nr;
2651
2652 reset = diff_get_color_opt(options, DIFF_RESET);
2653 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2654 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2655
2656 /*
2657 * Find the longest filename and max number of changes
2658 */
2659 for (i = 0; (i < count) && (i < data->nr); i++) {
2660 struct diffstat_file *file = data->files[i];
2661 uintmax_t change = file->added + file->deleted;
2662
2663 if (!file->is_interesting && (change == 0)) {
2664 count++; /* not shown == room for one more */
2665 continue;
2666 }
2667 fill_print_name(file);
2668 len = strlen(file->print_name);
2669 if (max_len < len)
2670 max_len = len;
2671
2672 if (file->is_unmerged) {
2673 /* "Unmerged" is 8 characters */
2674 bin_width = bin_width < 8 ? 8 : bin_width;
2675 continue;
2676 }
2677 if (file->is_binary) {
2678 /* "Bin XXX -> YYY bytes" */
2679 int w = 14 + decimal_width(file->added)
2680 + decimal_width(file->deleted);
2681 bin_width = bin_width < w ? w : bin_width;
2682 /* Display change counts aligned with "Bin" */
2683 number_width = 3;
2684 continue;
2685 }
2686
2687 if (max_change < change)
2688 max_change = change;
2689 }
2690 count = i; /* where we can stop scanning in data->files[] */
2691
2692 /*
2693 * We have width = stat_width or term_columns() columns total.
2694 * We want a maximum of min(max_len, stat_name_width) for the name part.
2695 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2696 * We also need 1 for " " and 4 + decimal_width(max_change)
2697 * for " | NNNN " and one the empty column at the end, altogether
2698 * 6 + decimal_width(max_change).
2699 *
2700 * If there's not enough space, we will use the smaller of
2701 * stat_name_width (if set) and 5/8*width for the filename,
2702 * and the rest for constant elements + graph part, but no more
2703 * than stat_graph_width for the graph part.
2704 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2705 * for the standard terminal size).
2706 *
2707 * In other words: stat_width limits the maximum width, and
2708 * stat_name_width fixes the maximum width of the filename,
2709 * and is also used to divide available columns if there
2710 * aren't enough.
2711 *
2712 * Binary files are displayed with "Bin XXX -> YYY bytes"
2713 * instead of the change count and graph. This part is treated
2714 * similarly to the graph part, except that it is not
2715 * "scaled". If total width is too small to accommodate the
2716 * guaranteed minimum width of the filename part and the
2717 * separators and this message, this message will "overflow"
2718 * making the line longer than the maximum width.
2719 */
2720
2721 if (options->stat_width == -1)
2722 width = term_columns() - strlen(line_prefix);
2723 else
2724 width = options->stat_width ? options->stat_width : 80;
2725 number_width = decimal_width(max_change) > number_width ?
2726 decimal_width(max_change) : number_width;
2727
2728 if (options->stat_graph_width == -1)
2729 options->stat_graph_width = diff_stat_graph_width;
2730
2731 /*
2732 * Guarantee 3/8*16==6 for the graph part
2733 * and 5/8*16==10 for the filename part
2734 */
2735 if (width < 16 + 6 + number_width)
2736 width = 16 + 6 + number_width;
2737
2738 /*
2739 * First assign sizes that are wanted, ignoring available width.
2740 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2741 * starting from "XXX" should fit in graph_width.
2742 */
2743 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2744 if (options->stat_graph_width &&
2745 options->stat_graph_width < graph_width)
2746 graph_width = options->stat_graph_width;
2747
2748 name_width = (options->stat_name_width > 0 &&
2749 options->stat_name_width < max_len) ?
2750 options->stat_name_width : max_len;
2751
2752 /*
2753 * Adjust adjustable widths not to exceed maximum width
2754 */
2755 if (name_width + number_width + 6 + graph_width > width) {
2756 if (graph_width > width * 3/8 - number_width - 6) {
2757 graph_width = width * 3/8 - number_width - 6;
2758 if (graph_width < 6)
2759 graph_width = 6;
2760 }
2761
2762 if (options->stat_graph_width &&
2763 graph_width > options->stat_graph_width)
2764 graph_width = options->stat_graph_width;
2765 if (name_width > width - number_width - 6 - graph_width)
2766 name_width = width - number_width - 6 - graph_width;
2767 else
2768 graph_width = width - number_width - 6 - name_width;
2769 }
2770
2771 /*
2772 * From here name_width is the width of the name area,
2773 * and graph_width is the width of the graph area.
2774 * max_change is used to scale graph properly.
2775 */
2776 for (i = 0; i < count; i++) {
2777 const char *prefix = "";
2778 struct diffstat_file *file = data->files[i];
2779 char *name = file->print_name;
2780 uintmax_t added = file->added;
2781 uintmax_t deleted = file->deleted;
2782 int name_len;
2783
2784 if (!file->is_interesting && (added + deleted == 0))
2785 continue;
2786
2787 /*
2788 * "scale" the filename
2789 */
2790 len = name_width;
2791 name_len = strlen(name);
2792 if (name_width < name_len) {
2793 char *slash;
2794 prefix = "...";
2795 len -= 3;
2796 name += name_len - len;
2797 slash = strchr(name, '/');
2798 if (slash)
2799 name = slash;
2800 }
2801
2802 if (file->is_binary) {
2803 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2804 strbuf_addf(&out, " %*s", number_width, "Bin");
2805 if (!added && !deleted) {
2806 strbuf_addch(&out, '\n');
2807 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2808 out.buf, out.len, 0);
2809 strbuf_reset(&out);
2810 continue;
2811 }
2812 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2813 del_c, deleted, reset);
2814 strbuf_addstr(&out, " -> ");
2815 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2816 add_c, added, reset);
2817 strbuf_addstr(&out, " bytes\n");
2818 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2819 out.buf, out.len, 0);
2820 strbuf_reset(&out);
2821 continue;
2822 }
2823 else if (file->is_unmerged) {
2824 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2825 strbuf_addstr(&out, " Unmerged\n");
2826 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2827 out.buf, out.len, 0);
2828 strbuf_reset(&out);
2829 continue;
2830 }
2831
2832 /*
2833 * scale the add/delete
2834 */
2835 add = added;
2836 del = deleted;
2837
2838 if (graph_width <= max_change) {
2839 int total = scale_linear(add + del, graph_width, max_change);
2840 if (total < 2 && add && del)
2841 /* width >= 2 due to the sanity check */
2842 total = 2;
2843 if (add < del) {
2844 add = scale_linear(add, graph_width, max_change);
2845 del = total - add;
2846 } else {
2847 del = scale_linear(del, graph_width, max_change);
2848 add = total - del;
2849 }
2850 }
2851 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2852 strbuf_addf(&out, " %*"PRIuMAX"%s",
2853 number_width, added + deleted,
2854 added + deleted ? " " : "");
2855 show_graph(&out, '+', add, add_c, reset);
2856 show_graph(&out, '-', del, del_c, reset);
2857 strbuf_addch(&out, '\n');
2858 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2859 out.buf, out.len, 0);
2860 strbuf_reset(&out);
2861 }
2862
2863 for (i = 0; i < data->nr; i++) {
2864 struct diffstat_file *file = data->files[i];
2865 uintmax_t added = file->added;
2866 uintmax_t deleted = file->deleted;
2867
2868 if (file->is_unmerged ||
2869 (!file->is_interesting && (added + deleted == 0))) {
2870 total_files--;
2871 continue;
2872 }
2873
2874 if (!file->is_binary) {
2875 adds += added;
2876 dels += deleted;
2877 }
2878 if (i < count)
2879 continue;
2880 if (!extra_shown)
2881 emit_diff_symbol(options,
2882 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2883 NULL, 0, 0);
2884 extra_shown = 1;
2885 }
2886
2887 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2888 strbuf_release(&out);
2889 }
2890
2891 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2892 {
2893 int i, adds = 0, dels = 0, total_files = data->nr;
2894
2895 if (data->nr == 0)
2896 return;
2897
2898 for (i = 0; i < data->nr; i++) {
2899 int added = data->files[i]->added;
2900 int deleted = data->files[i]->deleted;
2901
2902 if (data->files[i]->is_unmerged ||
2903 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2904 total_files--;
2905 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2906 adds += added;
2907 dels += deleted;
2908 }
2909 }
2910 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2911 }
2912
2913 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2914 {
2915 int i;
2916
2917 if (data->nr == 0)
2918 return;
2919
2920 for (i = 0; i < data->nr; i++) {
2921 struct diffstat_file *file = data->files[i];
2922
2923 fprintf(options->file, "%s", diff_line_prefix(options));
2924
2925 if (file->is_binary)
2926 fprintf(options->file, "-\t-\t");
2927 else
2928 fprintf(options->file,
2929 "%"PRIuMAX"\t%"PRIuMAX"\t",
2930 file->added, file->deleted);
2931 if (options->line_termination) {
2932 fill_print_name(file);
2933 if (!file->is_renamed)
2934 write_name_quoted(file->name, options->file,
2935 options->line_termination);
2936 else {
2937 fputs(file->print_name, options->file);
2938 putc(options->line_termination, options->file);
2939 }
2940 } else {
2941 if (file->is_renamed) {
2942 putc('\0', options->file);
2943 write_name_quoted(file->from_name, options->file, '\0');
2944 }
2945 write_name_quoted(file->name, options->file, '\0');
2946 }
2947 }
2948 }
2949
2950 struct dirstat_file {
2951 const char *name;
2952 unsigned long changed;
2953 };
2954
2955 struct dirstat_dir {
2956 struct dirstat_file *files;
2957 int alloc, nr, permille, cumulative;
2958 };
2959
2960 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2961 unsigned long changed, const char *base, int baselen)
2962 {
2963 unsigned long sum_changes = 0;
2964 unsigned int sources = 0;
2965 const char *line_prefix = diff_line_prefix(opt);
2966
2967 while (dir->nr) {
2968 struct dirstat_file *f = dir->files;
2969 int namelen = strlen(f->name);
2970 unsigned long changes;
2971 char *slash;
2972
2973 if (namelen < baselen)
2974 break;
2975 if (memcmp(f->name, base, baselen))
2976 break;
2977 slash = strchr(f->name + baselen, '/');
2978 if (slash) {
2979 int newbaselen = slash + 1 - f->name;
2980 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2981 sources++;
2982 } else {
2983 changes = f->changed;
2984 dir->files++;
2985 dir->nr--;
2986 sources += 2;
2987 }
2988 sum_changes += changes;
2989 }
2990
2991 /*
2992 * We don't report dirstat's for
2993 * - the top level
2994 * - or cases where everything came from a single directory
2995 * under this directory (sources == 1).
2996 */
2997 if (baselen && sources != 1) {
2998 if (sum_changes) {
2999 int permille = sum_changes * 1000 / changed;
3000 if (permille >= dir->permille) {
3001 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
3002 permille / 10, permille % 10, baselen, base);
3003 if (!dir->cumulative)
3004 return 0;
3005 }
3006 }
3007 }
3008 return sum_changes;
3009 }
3010
3011 static int dirstat_compare(const void *_a, const void *_b)
3012 {
3013 const struct dirstat_file *a = _a;
3014 const struct dirstat_file *b = _b;
3015 return strcmp(a->name, b->name);
3016 }
3017
3018 static void show_dirstat(struct diff_options *options)
3019 {
3020 int i;
3021 unsigned long changed;
3022 struct dirstat_dir dir;
3023 struct diff_queue_struct *q = &diff_queued_diff;
3024
3025 dir.files = NULL;
3026 dir.alloc = 0;
3027 dir.nr = 0;
3028 dir.permille = options->dirstat_permille;
3029 dir.cumulative = options->flags.dirstat_cumulative;
3030
3031 changed = 0;
3032 for (i = 0; i < q->nr; i++) {
3033 struct diff_filepair *p = q->queue[i];
3034 const char *name;
3035 unsigned long copied, added, damage;
3036 struct diff_populate_filespec_options dpf_options = {
3037 .check_size_only = 1,
3038 };
3039
3040 name = p->two->path ? p->two->path : p->one->path;
3041
3042 if (p->one->oid_valid && p->two->oid_valid &&
3043 oideq(&p->one->oid, &p->two->oid)) {
3044 /*
3045 * The SHA1 has not changed, so pre-/post-content is
3046 * identical. We can therefore skip looking at the
3047 * file contents altogether.
3048 */
3049 damage = 0;
3050 goto found_damage;
3051 }
3052
3053 if (options->flags.dirstat_by_file) {
3054 /*
3055 * In --dirstat-by-file mode, we don't really need to
3056 * look at the actual file contents at all.
3057 * The fact that the SHA1 changed is enough for us to
3058 * add this file to the list of results
3059 * (with each file contributing equal damage).
3060 */
3061 damage = 1;
3062 goto found_damage;
3063 }
3064
3065 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
3066 diff_populate_filespec(options->repo, p->one, NULL);
3067 diff_populate_filespec(options->repo, p->two, NULL);
3068 diffcore_count_changes(options->repo,
3069 p->one, p->two, NULL, NULL,
3070 &copied, &added);
3071 diff_free_filespec_data(p->one);
3072 diff_free_filespec_data(p->two);
3073 } else if (DIFF_FILE_VALID(p->one)) {
3074 diff_populate_filespec(options->repo, p->one, &dpf_options);
3075 copied = added = 0;
3076 diff_free_filespec_data(p->one);
3077 } else if (DIFF_FILE_VALID(p->two)) {
3078 diff_populate_filespec(options->repo, p->two, &dpf_options);
3079 copied = 0;
3080 added = p->two->size;
3081 diff_free_filespec_data(p->two);
3082 } else
3083 continue;
3084
3085 /*
3086 * Original minus copied is the removed material,
3087 * added is the new material. They are both damages
3088 * made to the preimage.
3089 * If the resulting damage is zero, we know that
3090 * diffcore_count_changes() considers the two entries to
3091 * be identical, but since the oid changed, we
3092 * know that there must have been _some_ kind of change,
3093 * so we force all entries to have damage > 0.
3094 */
3095 damage = (p->one->size - copied) + added;
3096 if (!damage)
3097 damage = 1;
3098
3099 found_damage:
3100 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3101 dir.files[dir.nr].name = name;
3102 dir.files[dir.nr].changed = damage;
3103 changed += damage;
3104 dir.nr++;
3105 }
3106
3107 /* This can happen even with many files, if everything was renames */
3108 if (!changed)
3109 return;
3110
3111 /* Show all directories with more than x% of the changes */
3112 QSORT(dir.files, dir.nr, dirstat_compare);
3113 gather_dirstat(options, &dir, changed, "", 0);
3114 }
3115
3116 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3117 {
3118 int i;
3119 unsigned long changed;
3120 struct dirstat_dir dir;
3121
3122 if (data->nr == 0)
3123 return;
3124
3125 dir.files = NULL;
3126 dir.alloc = 0;
3127 dir.nr = 0;
3128 dir.permille = options->dirstat_permille;
3129 dir.cumulative = options->flags.dirstat_cumulative;
3130
3131 changed = 0;
3132 for (i = 0; i < data->nr; i++) {
3133 struct diffstat_file *file = data->files[i];
3134 unsigned long damage = file->added + file->deleted;
3135 if (file->is_binary)
3136 /*
3137 * binary files counts bytes, not lines. Must find some
3138 * way to normalize binary bytes vs. textual lines.
3139 * The following heuristic assumes that there are 64
3140 * bytes per "line".
3141 * This is stupid and ugly, but very cheap...
3142 */
3143 damage = DIV_ROUND_UP(damage, 64);
3144 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3145 dir.files[dir.nr].name = file->name;
3146 dir.files[dir.nr].changed = damage;
3147 changed += damage;
3148 dir.nr++;
3149 }
3150
3151 /* This can happen even with many files, if everything was renames */
3152 if (!changed)
3153 return;
3154
3155 /* Show all directories with more than x% of the changes */
3156 QSORT(dir.files, dir.nr, dirstat_compare);
3157 gather_dirstat(options, &dir, changed, "", 0);
3158 }
3159
3160 static void free_diffstat_file(struct diffstat_file *f)
3161 {
3162 free(f->print_name);
3163 free(f->name);
3164 free(f->from_name);
3165 free(f);
3166 }
3167
3168 void free_diffstat_info(struct diffstat_t *diffstat)
3169 {
3170 int i;
3171 for (i = 0; i < diffstat->nr; i++)
3172 free_diffstat_file(diffstat->files[i]);
3173 free(diffstat->files);
3174 }
3175
3176 struct checkdiff_t {
3177 const char *filename;
3178 int lineno;
3179 int conflict_marker_size;
3180 struct diff_options *o;
3181 unsigned ws_rule;
3182 unsigned status;
3183 };
3184
3185 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3186 {
3187 char firstchar;
3188 int cnt;
3189
3190 if (len < marker_size + 1)
3191 return 0;
3192 firstchar = line[0];
3193 switch (firstchar) {
3194 case '=': case '>': case '<': case '|':
3195 break;
3196 default:
3197 return 0;
3198 }
3199 for (cnt = 1; cnt < marker_size; cnt++)
3200 if (line[cnt] != firstchar)
3201 return 0;
3202 /* line[1] through line[marker_size-1] are same as firstchar */
3203 if (len < marker_size + 1 || !isspace(line[marker_size]))
3204 return 0;
3205 return 1;
3206 }
3207
3208 static void checkdiff_consume_hunk(void *priv,
3209 long ob, long on, long nb, long nn,
3210 const char *func, long funclen)
3211
3212 {
3213 struct checkdiff_t *data = priv;
3214 data->lineno = nb - 1;
3215 }
3216
3217 static int checkdiff_consume(void *priv, char *line, unsigned long len)
3218 {
3219 struct checkdiff_t *data = priv;
3220 int marker_size = data->conflict_marker_size;
3221 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3222 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3223 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3224 char *err;
3225 const char *line_prefix;
3226
3227 assert(data->o);
3228 line_prefix = diff_line_prefix(data->o);
3229
3230 if (line[0] == '+') {
3231 unsigned bad;
3232 data->lineno++;
3233 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3234 data->status |= 1;
3235 fprintf(data->o->file,
3236 "%s%s:%d: leftover conflict marker\n",
3237 line_prefix, data->filename, data->lineno);
3238 }
3239 bad = ws_check(line + 1, len - 1, data->ws_rule);
3240 if (!bad)
3241 return 0;
3242 data->status |= bad;
3243 err = whitespace_error_string(bad);
3244 fprintf(data->o->file, "%s%s:%d: %s.\n",
3245 line_prefix, data->filename, data->lineno, err);
3246 free(err);
3247 emit_line(data->o, set, reset, line, 1);
3248 ws_check_emit(line + 1, len - 1, data->ws_rule,
3249 data->o->file, set, reset, ws);
3250 } else if (line[0] == ' ') {
3251 data->lineno++;
3252 }
3253 return 0;
3254 }
3255
3256 static unsigned char *deflate_it(char *data,
3257 unsigned long size,
3258 unsigned long *result_size)
3259 {
3260 int bound;
3261 unsigned char *deflated;
3262 git_zstream stream;
3263
3264 git_deflate_init(&stream, zlib_compression_level);
3265 bound = git_deflate_bound(&stream, size);
3266 deflated = xmalloc(bound);
3267 stream.next_out = deflated;
3268 stream.avail_out = bound;
3269
3270 stream.next_in = (unsigned char *)data;
3271 stream.avail_in = size;
3272 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3273 ; /* nothing */
3274 git_deflate_end(&stream);
3275 *result_size = stream.total_out;
3276 return deflated;
3277 }
3278
3279 static void emit_binary_diff_body(struct diff_options *o,
3280 mmfile_t *one, mmfile_t *two)
3281 {
3282 void *cp;
3283 void *delta;
3284 void *deflated;
3285 void *data;
3286 unsigned long orig_size;
3287 unsigned long delta_size;
3288 unsigned long deflate_size;
3289 unsigned long data_size;
3290
3291 /* We could do deflated delta, or we could do just deflated two,
3292 * whichever is smaller.
3293 */
3294 delta = NULL;
3295 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3296 if (one->size && two->size) {
3297 delta = diff_delta(one->ptr, one->size,
3298 two->ptr, two->size,
3299 &delta_size, deflate_size);
3300 if (delta) {
3301 void *to_free = delta;
3302 orig_size = delta_size;
3303 delta = deflate_it(delta, delta_size, &delta_size);
3304 free(to_free);
3305 }
3306 }
3307
3308 if (delta && delta_size < deflate_size) {
3309 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3310 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3311 s, strlen(s), 0);
3312 free(s);
3313 free(deflated);
3314 data = delta;
3315 data_size = delta_size;
3316 } else {
3317 char *s = xstrfmt("%lu", two->size);
3318 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3319 s, strlen(s), 0);
3320 free(s);
3321 free(delta);
3322 data = deflated;
3323 data_size = deflate_size;
3324 }
3325
3326 /* emit data encoded in base85 */
3327 cp = data;
3328 while (data_size) {
3329 int len;
3330 int bytes = (52 < data_size) ? 52 : data_size;
3331 char line[71];
3332 data_size -= bytes;
3333 if (bytes <= 26)
3334 line[0] = bytes + 'A' - 1;
3335 else
3336 line[0] = bytes - 26 + 'a' - 1;
3337 encode_85(line + 1, cp, bytes);
3338 cp = (char *) cp + bytes;
3339
3340 len = strlen(line);
3341 line[len++] = '\n';
3342 line[len] = '\0';
3343
3344 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3345 line, len, 0);
3346 }
3347 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3348 free(data);
3349 }
3350
3351 static void emit_binary_diff(struct diff_options *o,
3352 mmfile_t *one, mmfile_t *two)
3353 {
3354 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3355 emit_binary_diff_body(o, one, two);
3356 emit_binary_diff_body(o, two, one);
3357 }
3358
3359 int diff_filespec_is_binary(struct repository *r,
3360 struct diff_filespec *one)
3361 {
3362 struct diff_populate_filespec_options dpf_options = {
3363 .check_binary = 1,
3364 };
3365
3366 if (one->is_binary == -1) {
3367 diff_filespec_load_driver(one, r->index);
3368 if (one->driver->binary != -1)
3369 one->is_binary = one->driver->binary;
3370 else {
3371 if (!one->data && DIFF_FILE_VALID(one))
3372 diff_populate_filespec(r, one, &dpf_options);
3373 if (one->is_binary == -1 && one->data)
3374 one->is_binary = buffer_is_binary(one->data,
3375 one->size);
3376 if (one->is_binary == -1)
3377 one->is_binary = 0;
3378 }
3379 }
3380 return one->is_binary;
3381 }
3382
3383 static const struct userdiff_funcname *
3384 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3385 {
3386 diff_filespec_load_driver(one, o->repo->index);
3387 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3388 }
3389
3390 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3391 {
3392 if (!options->a_prefix)
3393 options->a_prefix = a;
3394 if (!options->b_prefix)
3395 options->b_prefix = b;
3396 }
3397
3398 struct userdiff_driver *get_textconv(struct repository *r,
3399 struct diff_filespec *one)
3400 {
3401 if (!DIFF_FILE_VALID(one))
3402 return NULL;
3403
3404 diff_filespec_load_driver(one, r->index);
3405 return userdiff_get_textconv(r, one->driver);
3406 }
3407
3408 static void builtin_diff(const char *name_a,
3409 const char *name_b,
3410 struct diff_filespec *one,
3411 struct diff_filespec *two,
3412 const char *xfrm_msg,
3413 int must_show_header,
3414 struct diff_options *o,
3415 int complete_rewrite)
3416 {
3417 mmfile_t mf1, mf2;
3418 const char *lbl[2];
3419 char *a_one, *b_two;
3420 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3421 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3422 const char *a_prefix, *b_prefix;
3423 struct userdiff_driver *textconv_one = NULL;
3424 struct userdiff_driver *textconv_two = NULL;
3425 struct strbuf header = STRBUF_INIT;
3426 const char *line_prefix = diff_line_prefix(o);
3427
3428 diff_set_mnemonic_prefix(o, "a/", "b/");
3429 if (o->flags.reverse_diff) {
3430 a_prefix = o->b_prefix;
3431 b_prefix = o->a_prefix;
3432 } else {
3433 a_prefix = o->a_prefix;
3434 b_prefix = o->b_prefix;
3435 }
3436
3437 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3438 (!one->mode || S_ISGITLINK(one->mode)) &&
3439 (!two->mode || S_ISGITLINK(two->mode))) {
3440 show_submodule_diff_summary(o, one->path ? one->path : two->path,
3441 &one->oid, &two->oid,
3442 two->dirty_submodule);
3443 return;
3444 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3445 (!one->mode || S_ISGITLINK(one->mode)) &&
3446 (!two->mode || S_ISGITLINK(two->mode))) {
3447 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3448 &one->oid, &two->oid,
3449 two->dirty_submodule);
3450 return;
3451 }
3452
3453 if (o->flags.allow_textconv) {
3454 textconv_one = get_textconv(o->repo, one);
3455 textconv_two = get_textconv(o->repo, two);
3456 }
3457
3458 /* Never use a non-valid filename anywhere if at all possible */
3459 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3460 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3461
3462 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3463 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3464 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3465 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3466 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3467 if (lbl[0][0] == '/') {
3468 /* /dev/null */
3469 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3470 if (xfrm_msg)
3471 strbuf_addstr(&header, xfrm_msg);
3472 must_show_header = 1;
3473 }
3474 else if (lbl[1][0] == '/') {
3475 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3476 if (xfrm_msg)
3477 strbuf_addstr(&header, xfrm_msg);
3478 must_show_header = 1;
3479 }
3480 else {
3481 if (one->mode != two->mode) {
3482 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3483 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3484 must_show_header = 1;
3485 }
3486 if (xfrm_msg)
3487 strbuf_addstr(&header, xfrm_msg);
3488
3489 /*
3490 * we do not run diff between different kind
3491 * of objects.
3492 */
3493 if ((one->mode ^ two->mode) & S_IFMT)
3494 goto free_ab_and_return;
3495 if (complete_rewrite &&
3496 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3497 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3498 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3499 header.buf, header.len, 0);
3500 strbuf_reset(&header);
3501 emit_rewrite_diff(name_a, name_b, one, two,
3502 textconv_one, textconv_two, o);
3503 o->found_changes = 1;
3504 goto free_ab_and_return;
3505 }
3506 }
3507
3508 if (o->irreversible_delete && lbl[1][0] == '/') {
3509 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3510 header.len, 0);
3511 strbuf_reset(&header);
3512 goto free_ab_and_return;
3513 } else if (!o->flags.text &&
3514 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3515 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3516 struct strbuf sb = STRBUF_INIT;
3517 if (!one->data && !two->data &&
3518 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3519 !o->flags.binary) {
3520 if (oideq(&one->oid, &two->oid)) {
3521 if (must_show_header)
3522 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3523 header.buf, header.len,
3524 0);
3525 goto free_ab_and_return;
3526 }
3527 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3528 header.buf, header.len, 0);
3529 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3530 diff_line_prefix(o), lbl[0], lbl[1]);
3531 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3532 sb.buf, sb.len, 0);
3533 strbuf_release(&sb);
3534 goto free_ab_and_return;
3535 }
3536 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3537 fill_mmfile(o->repo, &mf2, two) < 0)
3538 die("unable to read files to diff");
3539 /* Quite common confusing case */
3540 if (mf1.size == mf2.size &&
3541 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3542 if (must_show_header)
3543 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3544 header.buf, header.len, 0);
3545 goto free_ab_and_return;
3546 }
3547 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3548 strbuf_reset(&header);
3549 if (o->flags.binary)
3550 emit_binary_diff(o, &mf1, &mf2);
3551 else {
3552 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3553 diff_line_prefix(o), lbl[0], lbl[1]);
3554 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3555 sb.buf, sb.len, 0);
3556 strbuf_release(&sb);
3557 }
3558 o->found_changes = 1;
3559 } else {
3560 /* Crazy xdl interfaces.. */
3561 const char *diffopts;
3562 const char *v;
3563 xpparam_t xpp;
3564 xdemitconf_t xecfg;
3565 struct emit_callback ecbdata;
3566 const struct userdiff_funcname *pe;
3567
3568 if (must_show_header) {
3569 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3570 header.buf, header.len, 0);
3571 strbuf_reset(&header);
3572 }
3573
3574 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3575 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3576
3577 pe = diff_funcname_pattern(o, one);
3578 if (!pe)
3579 pe = diff_funcname_pattern(o, two);
3580
3581 memset(&xpp, 0, sizeof(xpp));
3582 memset(&xecfg, 0, sizeof(xecfg));
3583 memset(&ecbdata, 0, sizeof(ecbdata));
3584 if (o->flags.suppress_diff_headers)
3585 lbl[0] = NULL;
3586 ecbdata.label_path = lbl;
3587 ecbdata.color_diff = want_color(o->use_color);
3588 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3589 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3590 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3591 ecbdata.opt = o;
3592 if (header.len && !o->flags.suppress_diff_headers)
3593 ecbdata.header = &header;
3594 xpp.flags = o->xdl_opts;
3595 xpp.ignore_regex = o->ignore_regex;
3596 xpp.ignore_regex_nr = o->ignore_regex_nr;
3597 xpp.anchors = o->anchors;
3598 xpp.anchors_nr = o->anchors_nr;
3599 xecfg.ctxlen = o->context;
3600 xecfg.interhunkctxlen = o->interhunkcontext;
3601 xecfg.flags = XDL_EMIT_FUNCNAMES;
3602 if (o->flags.funccontext)
3603 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3604 if (pe)
3605 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3606
3607 diffopts = getenv("GIT_DIFF_OPTS");
3608 if (!diffopts)
3609 ;
3610 else if (skip_prefix(diffopts, "--unified=", &v))
3611 xecfg.ctxlen = strtoul(v, NULL, 10);
3612 else if (skip_prefix(diffopts, "-u", &v))
3613 xecfg.ctxlen = strtoul(v, NULL, 10);
3614
3615 if (o->word_diff)
3616 init_diff_words_data(&ecbdata, o, one, two);
3617 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3618 &ecbdata, &xpp, &xecfg))
3619 die("unable to generate diff for %s", one->path);
3620 if (o->word_diff)
3621 free_diff_words_data(&ecbdata);
3622 if (textconv_one)
3623 free(mf1.ptr);
3624 if (textconv_two)
3625 free(mf2.ptr);
3626 xdiff_clear_find_func(&xecfg);
3627 }
3628
3629 free_ab_and_return:
3630 strbuf_release(&header);
3631 diff_free_filespec_data(one);
3632 diff_free_filespec_data(two);
3633 free(a_one);
3634 free(b_two);
3635 return;
3636 }
3637
3638 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3639 {
3640 if (!is_renamed) {
3641 if (p->status == DIFF_STATUS_ADDED) {
3642 if (S_ISLNK(p->two->mode))
3643 return "new +l";
3644 else if ((p->two->mode & 0777) == 0755)
3645 return "new +x";
3646 else
3647 return "new";
3648 } else if (p->status == DIFF_STATUS_DELETED)
3649 return "gone";
3650 }
3651 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3652 return "mode -l";
3653 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3654 return "mode +l";
3655 else if ((p->one->mode & 0777) == 0644 &&
3656 (p->two->mode & 0777) == 0755)
3657 return "mode +x";
3658 else if ((p->one->mode & 0777) == 0755 &&
3659 (p->two->mode & 0777) == 0644)
3660 return "mode -x";
3661 return NULL;
3662 }
3663
3664 static void builtin_diffstat(const char *name_a, const char *name_b,
3665 struct diff_filespec *one,
3666 struct diff_filespec *two,
3667 struct diffstat_t *diffstat,
3668 struct diff_options *o,
3669 struct diff_filepair *p)
3670 {
3671 mmfile_t mf1, mf2;
3672 struct diffstat_file *data;
3673 int may_differ;
3674 int complete_rewrite = 0;
3675
3676 if (!DIFF_PAIR_UNMERGED(p)) {
3677 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3678 complete_rewrite = 1;
3679 }
3680
3681 data = diffstat_add(diffstat, name_a, name_b);
3682 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3683 if (o->flags.stat_with_summary)
3684 data->comments = get_compact_summary(p, data->is_renamed);
3685
3686 if (!one || !two) {
3687 data->is_unmerged = 1;
3688 return;
3689 }
3690
3691 /* saves some reads if true, not a guarantee of diff outcome */
3692 may_differ = !(one->oid_valid && two->oid_valid &&
3693 oideq(&one->oid, &two->oid));
3694
3695 if (diff_filespec_is_binary(o->repo, one) ||
3696 diff_filespec_is_binary(o->repo, two)) {
3697 data->is_binary = 1;
3698 if (!may_differ) {
3699 data->added = 0;
3700 data->deleted = 0;
3701 } else {
3702 data->added = diff_filespec_size(o->repo, two);
3703 data->deleted = diff_filespec_size(o->repo, one);
3704 }
3705 }
3706
3707 else if (complete_rewrite) {
3708 diff_populate_filespec(o->repo, one, NULL);
3709 diff_populate_filespec(o->repo, two, NULL);
3710 data->deleted = count_lines(one->data, one->size);
3711 data->added = count_lines(two->data, two->size);
3712 }
3713
3714 else if (may_differ) {
3715 /* Crazy xdl interfaces.. */
3716 xpparam_t xpp;
3717 xdemitconf_t xecfg;
3718
3719 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3720 fill_mmfile(o->repo, &mf2, two) < 0)
3721 die("unable to read files to diff");
3722
3723 memset(&xpp, 0, sizeof(xpp));
3724 memset(&xecfg, 0, sizeof(xecfg));
3725 xpp.flags = o->xdl_opts;
3726 xpp.ignore_regex = o->ignore_regex;
3727 xpp.ignore_regex_nr = o->ignore_regex_nr;
3728 xpp.anchors = o->anchors;
3729 xpp.anchors_nr = o->anchors_nr;
3730 xecfg.ctxlen = o->context;
3731 xecfg.interhunkctxlen = o->interhunkcontext;
3732 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
3733 if (xdi_diff_outf(&mf1, &mf2, NULL,
3734 diffstat_consume, diffstat, &xpp, &xecfg))
3735 die("unable to generate diffstat for %s", one->path);
3736
3737 if (DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two)) {
3738 struct diffstat_file *file =
3739 diffstat->files[diffstat->nr - 1];
3740 /*
3741 * Omit diffstats of modified files where nothing changed.
3742 * Even if may_differ, this might be the case due to
3743 * ignoring whitespace changes, etc.
3744 *
3745 * But note that we special-case additions, deletions,
3746 * renames, and mode changes as adding an empty file,
3747 * for example is still of interest.
3748 */
3749 if ((p->status == DIFF_STATUS_MODIFIED)
3750 && !file->added
3751 && !file->deleted
3752 && one->mode == two->mode) {
3753 free_diffstat_file(file);
3754 diffstat->nr--;
3755 }
3756 }
3757 }
3758
3759 diff_free_filespec_data(one);
3760 diff_free_filespec_data(two);
3761 }
3762
3763 static void builtin_checkdiff(const char *name_a, const char *name_b,
3764 const char *attr_path,
3765 struct diff_filespec *one,
3766 struct diff_filespec *two,
3767 struct diff_options *o)
3768 {
3769 mmfile_t mf1, mf2;
3770 struct checkdiff_t data;
3771
3772 if (!two)
3773 return;
3774
3775 memset(&data, 0, sizeof(data));
3776 data.filename = name_b ? name_b : name_a;
3777 data.lineno = 0;
3778 data.o = o;
3779 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3780 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3781
3782 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3783 fill_mmfile(o->repo, &mf2, two) < 0)
3784 die("unable to read files to diff");
3785
3786 /*
3787 * All the other codepaths check both sides, but not checking
3788 * the "old" side here is deliberate. We are checking the newly
3789 * introduced changes, and as long as the "new" side is text, we
3790 * can and should check what it introduces.
3791 */
3792 if (diff_filespec_is_binary(o->repo, two))
3793 goto free_and_return;
3794 else {
3795 /* Crazy xdl interfaces.. */
3796 xpparam_t xpp;
3797 xdemitconf_t xecfg;
3798
3799 memset(&xpp, 0, sizeof(xpp));
3800 memset(&xecfg, 0, sizeof(xecfg));
3801 xecfg.ctxlen = 1; /* at least one context line */
3802 xpp.flags = 0;
3803 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3804 checkdiff_consume, &data,
3805 &xpp, &xecfg))
3806 die("unable to generate checkdiff for %s", one->path);
3807
3808 if (data.ws_rule & WS_BLANK_AT_EOF) {
3809 struct emit_callback ecbdata;
3810 int blank_at_eof;
3811
3812 ecbdata.ws_rule = data.ws_rule;
3813 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3814 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3815
3816 if (blank_at_eof) {
3817 static char *err;
3818 if (!err)
3819 err = whitespace_error_string(WS_BLANK_AT_EOF);
3820 fprintf(o->file, "%s:%d: %s.\n",
3821 data.filename, blank_at_eof, err);
3822 data.status = 1; /* report errors */
3823 }
3824 }
3825 }
3826 free_and_return:
3827 diff_free_filespec_data(one);
3828 diff_free_filespec_data(two);
3829 if (data.status)
3830 o->flags.check_failed = 1;
3831 }
3832
3833 struct diff_filespec *alloc_filespec(const char *path)
3834 {
3835 struct diff_filespec *spec;
3836
3837 FLEXPTR_ALLOC_STR(spec, path, path);
3838 spec->count = 1;
3839 spec->is_binary = -1;
3840 return spec;
3841 }
3842
3843 void free_filespec(struct diff_filespec *spec)
3844 {
3845 if (!--spec->count) {
3846 diff_free_filespec_data(spec);
3847 free(spec);
3848 }
3849 }
3850
3851 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3852 int oid_valid, unsigned short mode)
3853 {
3854 if (mode) {
3855 spec->mode = canon_mode(mode);
3856 oidcpy(&spec->oid, oid);
3857 spec->oid_valid = oid_valid;
3858 }
3859 }
3860
3861 /*
3862 * Given a name and sha1 pair, if the index tells us the file in
3863 * the work tree has that object contents, return true, so that
3864 * prepare_temp_file() does not have to inflate and extract.
3865 */
3866 static int reuse_worktree_file(struct index_state *istate,
3867 const char *name,
3868 const struct object_id *oid,
3869 int want_file)
3870 {
3871 const struct cache_entry *ce;
3872 struct stat st;
3873 int pos, len;
3874
3875 /*
3876 * We do not read the cache ourselves here, because the
3877 * benchmark with my previous version that always reads cache
3878 * shows that it makes things worse for diff-tree comparing
3879 * two linux-2.6 kernel trees in an already checked out work
3880 * tree. This is because most diff-tree comparisons deal with
3881 * only a small number of files, while reading the cache is
3882 * expensive for a large project, and its cost outweighs the
3883 * savings we get by not inflating the object to a temporary
3884 * file. Practically, this code only helps when we are used
3885 * by diff-cache --cached, which does read the cache before
3886 * calling us.
3887 */
3888 if (!istate->cache)
3889 return 0;
3890
3891 /* We want to avoid the working directory if our caller
3892 * doesn't need the data in a normal file, this system
3893 * is rather slow with its stat/open/mmap/close syscalls,
3894 * and the object is contained in a pack file. The pack
3895 * is probably already open and will be faster to obtain
3896 * the data through than the working directory. Loose
3897 * objects however would tend to be slower as they need
3898 * to be individually opened and inflated.
3899 */
3900 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3901 return 0;
3902
3903 /*
3904 * Similarly, if we'd have to convert the file contents anyway, that
3905 * makes the optimization not worthwhile.
3906 */
3907 if (!want_file && would_convert_to_git(istate, name))
3908 return 0;
3909
3910 len = strlen(name);
3911 pos = index_name_pos(istate, name, len);
3912 if (pos < 0)
3913 return 0;
3914 ce = istate->cache[pos];
3915
3916 /*
3917 * This is not the sha1 we are looking for, or
3918 * unreusable because it is not a regular file.
3919 */
3920 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3921 return 0;
3922
3923 /*
3924 * If ce is marked as "assume unchanged", there is no
3925 * guarantee that work tree matches what we are looking for.
3926 */
3927 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3928 return 0;
3929
3930 /*
3931 * If ce matches the file in the work tree, we can reuse it.
3932 */
3933 if (ce_uptodate(ce) ||
3934 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3935 return 1;
3936
3937 return 0;
3938 }
3939
3940 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3941 {
3942 struct strbuf buf = STRBUF_INIT;
3943 char *dirty = "";
3944
3945 /* Are we looking at the work tree? */
3946 if (s->dirty_submodule)
3947 dirty = "-dirty";
3948
3949 strbuf_addf(&buf, "Subproject commit %s%s\n",
3950 oid_to_hex(&s->oid), dirty);
3951 s->size = buf.len;
3952 if (size_only) {
3953 s->data = NULL;
3954 strbuf_release(&buf);
3955 } else {
3956 s->data = strbuf_detach(&buf, NULL);
3957 s->should_free = 1;
3958 }
3959 return 0;
3960 }
3961
3962 /*
3963 * While doing rename detection and pickaxe operation, we may need to
3964 * grab the data for the blob (or file) for our own in-core comparison.
3965 * diff_filespec has data and size fields for this purpose.
3966 */
3967 int diff_populate_filespec(struct repository *r,
3968 struct diff_filespec *s,
3969 const struct diff_populate_filespec_options *options)
3970 {
3971 int size_only = options ? options->check_size_only : 0;
3972 int check_binary = options ? options->check_binary : 0;
3973 int err = 0;
3974 int conv_flags = global_conv_flags_eol;
3975 /*
3976 * demote FAIL to WARN to allow inspecting the situation
3977 * instead of refusing.
3978 */
3979 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3980 conv_flags = CONV_EOL_RNDTRP_WARN;
3981
3982 if (!DIFF_FILE_VALID(s))
3983 die("internal error: asking to populate invalid file.");
3984 if (S_ISDIR(s->mode))
3985 return -1;
3986
3987 if (s->data)
3988 return 0;
3989
3990 if (size_only && 0 < s->size)
3991 return 0;
3992
3993 if (S_ISGITLINK(s->mode))
3994 return diff_populate_gitlink(s, size_only);
3995
3996 if (!s->oid_valid ||
3997 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3998 struct strbuf buf = STRBUF_INIT;
3999 struct stat st;
4000 int fd;
4001
4002 if (lstat(s->path, &st) < 0) {
4003 err_empty:
4004 err = -1;
4005 empty:
4006 s->data = (char *)"";
4007 s->size = 0;
4008 return err;
4009 }
4010 s->size = xsize_t(st.st_size);
4011 if (!s->size)
4012 goto empty;
4013 if (S_ISLNK(st.st_mode)) {
4014 struct strbuf sb = STRBUF_INIT;
4015
4016 if (strbuf_readlink(&sb, s->path, s->size))
4017 goto err_empty;
4018 s->size = sb.len;
4019 s->data = strbuf_detach(&sb, NULL);
4020 s->should_free = 1;
4021 return 0;
4022 }
4023
4024 /*
4025 * Even if the caller would be happy with getting
4026 * only the size, we cannot return early at this
4027 * point if the path requires us to run the content
4028 * conversion.
4029 */
4030 if (size_only && !would_convert_to_git(r->index, s->path))
4031 return 0;
4032
4033 /*
4034 * Note: this check uses xsize_t(st.st_size) that may
4035 * not be the true size of the blob after it goes
4036 * through convert_to_git(). This may not strictly be
4037 * correct, but the whole point of big_file_threshold
4038 * and is_binary check being that we want to avoid
4039 * opening the file and inspecting the contents, this
4040 * is probably fine.
4041 */
4042 if (check_binary &&
4043 s->size > big_file_threshold && s->is_binary == -1) {
4044 s->is_binary = 1;
4045 return 0;
4046 }
4047 fd = open(s->path, O_RDONLY);
4048 if (fd < 0)
4049 goto err_empty;
4050 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
4051 close(fd);
4052 s->should_munmap = 1;
4053
4054 /*
4055 * Convert from working tree format to canonical git format
4056 */
4057 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
4058 size_t size = 0;
4059 munmap(s->data, s->size);
4060 s->should_munmap = 0;
4061 s->data = strbuf_detach(&buf, &size);
4062 s->size = size;
4063 s->should_free = 1;
4064 }
4065 }
4066 else {
4067 struct object_info info = {
4068 .sizep = &s->size
4069 };
4070
4071 if (!(size_only || check_binary))
4072 /*
4073 * Set contentp, since there is no chance that merely
4074 * the size is sufficient.
4075 */
4076 info.contentp = &s->data;
4077
4078 if (options && options->missing_object_cb) {
4079 if (!oid_object_info_extended(r, &s->oid, &info,
4080 OBJECT_INFO_LOOKUP_REPLACE |
4081 OBJECT_INFO_SKIP_FETCH_OBJECT))
4082 goto object_read;
4083 options->missing_object_cb(options->missing_object_data);
4084 }
4085 if (oid_object_info_extended(r, &s->oid, &info,
4086 OBJECT_INFO_LOOKUP_REPLACE))
4087 die("unable to read %s", oid_to_hex(&s->oid));
4088
4089 object_read:
4090 if (size_only || check_binary) {
4091 if (size_only)
4092 return 0;
4093 if (s->size > big_file_threshold && s->is_binary == -1) {
4094 s->is_binary = 1;
4095 return 0;
4096 }
4097 }
4098 if (!info.contentp) {
4099 info.contentp = &s->data;
4100 if (oid_object_info_extended(r, &s->oid, &info,
4101 OBJECT_INFO_LOOKUP_REPLACE))
4102 die("unable to read %s", oid_to_hex(&s->oid));
4103 }
4104 s->should_free = 1;
4105 }
4106 return 0;
4107 }
4108
4109 void diff_free_filespec_blob(struct diff_filespec *s)
4110 {
4111 if (s->should_free)
4112 free(s->data);
4113 else if (s->should_munmap)
4114 munmap(s->data, s->size);
4115
4116 if (s->should_free || s->should_munmap) {
4117 s->should_free = s->should_munmap = 0;
4118 s->data = NULL;
4119 }
4120 }
4121
4122 void diff_free_filespec_data(struct diff_filespec *s)
4123 {
4124 if (!s)
4125 return;
4126
4127 diff_free_filespec_blob(s);
4128 FREE_AND_NULL(s->cnt_data);
4129 }
4130
4131 static void prep_temp_blob(struct index_state *istate,
4132 const char *path, struct diff_tempfile *temp,
4133 void *blob,
4134 unsigned long size,
4135 const struct object_id *oid,
4136 int mode)
4137 {
4138 struct strbuf buf = STRBUF_INIT;
4139 struct strbuf tempfile = STRBUF_INIT;
4140 char *path_dup = xstrdup(path);
4141 const char *base = basename(path_dup);
4142 struct checkout_metadata meta;
4143
4144 init_checkout_metadata(&meta, NULL, NULL, oid);
4145
4146 /* Generate "XXXXXX_basename.ext" */
4147 strbuf_addstr(&tempfile, "XXXXXX_");
4148 strbuf_addstr(&tempfile, base);
4149
4150 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4151 if (!temp->tempfile)
4152 die_errno("unable to create temp-file");
4153 if (convert_to_working_tree(istate, path,
4154 (const char *)blob, (size_t)size, &buf, &meta)) {
4155 blob = buf.buf;
4156 size = buf.len;
4157 }
4158 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4159 close_tempfile_gently(temp->tempfile))
4160 die_errno("unable to write temp-file");
4161 temp->name = get_tempfile_path(temp->tempfile);
4162 oid_to_hex_r(temp->hex, oid);
4163 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4164 strbuf_release(&buf);
4165 strbuf_release(&tempfile);
4166 free(path_dup);
4167 }
4168
4169 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4170 const char *name,
4171 struct diff_filespec *one)
4172 {
4173 struct diff_tempfile *temp = claim_diff_tempfile();
4174
4175 if (!DIFF_FILE_VALID(one)) {
4176 not_a_valid_file:
4177 /* A '-' entry produces this for file-2, and
4178 * a '+' entry produces this for file-1.
4179 */
4180 temp->name = "/dev/null";
4181 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4182 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4183 return temp;
4184 }
4185
4186 if (!S_ISGITLINK(one->mode) &&
4187 (!one->oid_valid ||
4188 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4189 struct stat st;
4190 if (lstat(name, &st) < 0) {
4191 if (errno == ENOENT)
4192 goto not_a_valid_file;
4193 die_errno("stat(%s)", name);
4194 }
4195 if (S_ISLNK(st.st_mode)) {
4196 struct strbuf sb = STRBUF_INIT;
4197 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4198 die_errno("readlink(%s)", name);
4199 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4200 (one->oid_valid ?
4201 &one->oid : null_oid()),
4202 (one->oid_valid ?
4203 one->mode : S_IFLNK));
4204 strbuf_release(&sb);
4205 }
4206 else {
4207 /* we can borrow from the file in the work tree */
4208 temp->name = name;
4209 if (!one->oid_valid)
4210 oid_to_hex_r(temp->hex, null_oid());
4211 else
4212 oid_to_hex_r(temp->hex, &one->oid);
4213 /* Even though we may sometimes borrow the
4214 * contents from the work tree, we always want
4215 * one->mode. mode is trustworthy even when
4216 * !(one->oid_valid), as long as
4217 * DIFF_FILE_VALID(one).
4218 */
4219 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4220 }
4221 return temp;
4222 }
4223 else {
4224 if (diff_populate_filespec(r, one, NULL))
4225 die("cannot read data blob for %s", one->path);
4226 prep_temp_blob(r->index, name, temp,
4227 one->data, one->size,
4228 &one->oid, one->mode);
4229 }
4230 return temp;
4231 }
4232
4233 static void add_external_diff_name(struct repository *r,
4234 struct strvec *argv,
4235 const char *name,
4236 struct diff_filespec *df)
4237 {
4238 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4239 strvec_push(argv, temp->name);
4240 strvec_push(argv, temp->hex);
4241 strvec_push(argv, temp->mode);
4242 }
4243
4244 /* An external diff command takes:
4245 *
4246 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4247 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4248 *
4249 */
4250 static void run_external_diff(const char *pgm,
4251 const char *name,
4252 const char *other,
4253 struct diff_filespec *one,
4254 struct diff_filespec *two,
4255 const char *xfrm_msg,
4256 struct diff_options *o)
4257 {
4258 struct strvec argv = STRVEC_INIT;
4259 struct strvec env = STRVEC_INIT;
4260 struct diff_queue_struct *q = &diff_queued_diff;
4261
4262 strvec_push(&argv, pgm);
4263 strvec_push(&argv, name);
4264
4265 if (one && two) {
4266 add_external_diff_name(o->repo, &argv, name, one);
4267 if (!other)
4268 add_external_diff_name(o->repo, &argv, name, two);
4269 else {
4270 add_external_diff_name(o->repo, &argv, other, two);
4271 strvec_push(&argv, other);
4272 strvec_push(&argv, xfrm_msg);
4273 }
4274 }
4275
4276 strvec_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4277 strvec_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4278
4279 diff_free_filespec_data(one);
4280 diff_free_filespec_data(two);
4281 if (run_command_v_opt_cd_env(argv.v, RUN_USING_SHELL, NULL, env.v))
4282 die(_("external diff died, stopping at %s"), name);
4283
4284 remove_tempfile();
4285 strvec_clear(&argv);
4286 strvec_clear(&env);
4287 }
4288
4289 static int similarity_index(struct diff_filepair *p)
4290 {
4291 return p->score * 100 / MAX_SCORE;
4292 }
4293
4294 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4295 {
4296 if (startup_info->have_repository)
4297 return find_unique_abbrev(oid, abbrev);
4298 else {
4299 char *hex = oid_to_hex(oid);
4300 if (abbrev < 0)
4301 abbrev = FALLBACK_DEFAULT_ABBREV;
4302 if (abbrev > the_hash_algo->hexsz)
4303 BUG("oid abbreviation out of range: %d", abbrev);
4304 if (abbrev)
4305 hex[abbrev] = '\0';
4306 return hex;
4307 }
4308 }
4309
4310 static void fill_metainfo(struct strbuf *msg,
4311 const char *name,
4312 const char *other,
4313 struct diff_filespec *one,
4314 struct diff_filespec *two,
4315 struct diff_options *o,
4316 struct diff_filepair *p,
4317 int *must_show_header,
4318 int use_color)
4319 {
4320 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4321 const char *reset = diff_get_color(use_color, DIFF_RESET);
4322 const char *line_prefix = diff_line_prefix(o);
4323
4324 *must_show_header = 1;
4325 strbuf_init(msg, PATH_MAX * 2 + 300);
4326 switch (p->status) {
4327 case DIFF_STATUS_COPIED:
4328 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4329 line_prefix, set, similarity_index(p));
4330 strbuf_addf(msg, "%s\n%s%scopy from ",
4331 reset, line_prefix, set);
4332 quote_c_style(name, msg, NULL, 0);
4333 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4334 quote_c_style(other, msg, NULL, 0);
4335 strbuf_addf(msg, "%s\n", reset);
4336 break;
4337 case DIFF_STATUS_RENAMED:
4338 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4339 line_prefix, set, similarity_index(p));
4340 strbuf_addf(msg, "%s\n%s%srename from ",
4341 reset, line_prefix, set);
4342 quote_c_style(name, msg, NULL, 0);
4343 strbuf_addf(msg, "%s\n%s%srename to ",
4344 reset, line_prefix, set);
4345 quote_c_style(other, msg, NULL, 0);
4346 strbuf_addf(msg, "%s\n", reset);
4347 break;
4348 case DIFF_STATUS_MODIFIED:
4349 if (p->score) {
4350 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4351 line_prefix,
4352 set, similarity_index(p), reset);
4353 break;
4354 }
4355 /* fallthru */
4356 default:
4357 *must_show_header = 0;
4358 }
4359 if (one && two && !oideq(&one->oid, &two->oid)) {
4360 const unsigned hexsz = the_hash_algo->hexsz;
4361 int abbrev = o->abbrev ? o->abbrev : DEFAULT_ABBREV;
4362
4363 if (o->flags.full_index)
4364 abbrev = hexsz;
4365
4366 if (o->flags.binary) {
4367 mmfile_t mf;
4368 if ((!fill_mmfile(o->repo, &mf, one) &&
4369 diff_filespec_is_binary(o->repo, one)) ||
4370 (!fill_mmfile(o->repo, &mf, two) &&
4371 diff_filespec_is_binary(o->repo, two)))
4372 abbrev = hexsz;
4373 }
4374 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4375 diff_abbrev_oid(&one->oid, abbrev),
4376 diff_abbrev_oid(&two->oid, abbrev));
4377 if (one->mode == two->mode)
4378 strbuf_addf(msg, " %06o", one->mode);
4379 strbuf_addf(msg, "%s\n", reset);
4380 }
4381 }
4382
4383 static void run_diff_cmd(const char *pgm,
4384 const char *name,
4385 const char *other,
4386 const char *attr_path,
4387 struct diff_filespec *one,
4388 struct diff_filespec *two,
4389 struct strbuf *msg,
4390 struct diff_options *o,
4391 struct diff_filepair *p)
4392 {
4393 const char *xfrm_msg = NULL;
4394 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4395 int must_show_header = 0;
4396
4397
4398 if (o->flags.allow_external) {
4399 struct userdiff_driver *drv;
4400
4401 drv = userdiff_find_by_path(o->repo->index, attr_path);
4402 if (drv && drv->external)
4403 pgm = drv->external;
4404 }
4405
4406 if (msg) {
4407 /*
4408 * don't use colors when the header is intended for an
4409 * external diff driver
4410 */
4411 fill_metainfo(msg, name, other, one, two, o, p,
4412 &must_show_header,
4413 want_color(o->use_color) && !pgm);
4414 xfrm_msg = msg->len ? msg->buf : NULL;
4415 }
4416
4417 if (pgm) {
4418 run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
4419 return;
4420 }
4421 if (one && two)
4422 builtin_diff(name, other ? other : name,
4423 one, two, xfrm_msg, must_show_header,
4424 o, complete_rewrite);
4425 else
4426 fprintf(o->file, "* Unmerged path %s\n", name);
4427 }
4428
4429 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4430 {
4431 if (DIFF_FILE_VALID(one)) {
4432 if (!one->oid_valid) {
4433 struct stat st;
4434 if (one->is_stdin) {
4435 oidclr(&one->oid);
4436 return;
4437 }
4438 if (lstat(one->path, &st) < 0)
4439 die_errno("stat '%s'", one->path);
4440 if (index_path(istate, &one->oid, one->path, &st, 0))
4441 die("cannot hash %s", one->path);
4442 }
4443 }
4444 else
4445 oidclr(&one->oid);
4446 }
4447
4448 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4449 {
4450 /* Strip the prefix but do not molest /dev/null and absolute paths */
4451 if (*namep && !is_absolute_path(*namep)) {
4452 *namep += prefix_length;
4453 if (**namep == '/')
4454 ++*namep;
4455 }
4456 if (*otherp && !is_absolute_path(*otherp)) {
4457 *otherp += prefix_length;
4458 if (**otherp == '/')
4459 ++*otherp;
4460 }
4461 }
4462
4463 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4464 {
4465 const char *pgm = external_diff();
4466 struct strbuf msg;
4467 struct diff_filespec *one = p->one;
4468 struct diff_filespec *two = p->two;
4469 const char *name;
4470 const char *other;
4471 const char *attr_path;
4472
4473 name = one->path;
4474 other = (strcmp(name, two->path) ? two->path : NULL);
4475 attr_path = name;
4476 if (o->prefix_length)
4477 strip_prefix(o->prefix_length, &name, &other);
4478
4479 if (!o->flags.allow_external)
4480 pgm = NULL;
4481
4482 if (DIFF_PAIR_UNMERGED(p)) {
4483 run_diff_cmd(pgm, name, NULL, attr_path,
4484 NULL, NULL, NULL, o, p);
4485 return;
4486 }
4487
4488 diff_fill_oid_info(one, o->repo->index);
4489 diff_fill_oid_info(two, o->repo->index);
4490
4491 if (!pgm &&
4492 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4493 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4494 /*
4495 * a filepair that changes between file and symlink
4496 * needs to be split into deletion and creation.
4497 */
4498 struct diff_filespec *null = alloc_filespec(two->path);
4499 run_diff_cmd(NULL, name, other, attr_path,
4500 one, null, &msg,
4501 o, p);
4502 free(null);
4503 strbuf_release(&msg);
4504
4505 null = alloc_filespec(one->path);
4506 run_diff_cmd(NULL, name, other, attr_path,
4507 null, two, &msg, o, p);
4508 free(null);
4509 }
4510 else
4511 run_diff_cmd(pgm, name, other, attr_path,
4512 one, two, &msg, o, p);
4513
4514 strbuf_release(&msg);
4515 }
4516
4517 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4518 struct diffstat_t *diffstat)
4519 {
4520 const char *name;
4521 const char *other;
4522
4523 if (DIFF_PAIR_UNMERGED(p)) {
4524 /* unmerged */
4525 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4526 diffstat, o, p);
4527 return;
4528 }
4529
4530 name = p->one->path;
4531 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4532
4533 if (o->prefix_length)
4534 strip_prefix(o->prefix_length, &name, &other);
4535
4536 diff_fill_oid_info(p->one, o->repo->index);
4537 diff_fill_oid_info(p->two, o->repo->index);
4538
4539 builtin_diffstat(name, other, p->one, p->two,
4540 diffstat, o, p);
4541 }
4542
4543 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4544 {
4545 const char *name;
4546 const char *other;
4547 const char *attr_path;
4548
4549 if (DIFF_PAIR_UNMERGED(p)) {
4550 /* unmerged */
4551 return;
4552 }
4553
4554 name = p->one->path;
4555 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4556 attr_path = other ? other : name;
4557
4558 if (o->prefix_length)
4559 strip_prefix(o->prefix_length, &name, &other);
4560
4561 diff_fill_oid_info(p->one, o->repo->index);
4562 diff_fill_oid_info(p->two, o->repo->index);
4563
4564 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4565 }
4566
4567 static void prep_parse_options(struct diff_options *options);
4568
4569 void repo_diff_setup(struct repository *r, struct diff_options *options)
4570 {
4571 memcpy(options, &default_diff_options, sizeof(*options));
4572
4573 options->file = stdout;
4574 options->repo = r;
4575
4576 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4577 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4578 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4579 options->abbrev = DEFAULT_ABBREV;
4580 options->line_termination = '\n';
4581 options->break_opt = -1;
4582 options->rename_limit = -1;
4583 options->dirstat_permille = diff_dirstat_permille_default;
4584 options->context = diff_context_default;
4585 options->interhunkcontext = diff_interhunk_context_default;
4586 options->ws_error_highlight = ws_error_highlight_default;
4587 options->flags.rename_empty = 1;
4588 options->flags.relative_name = diff_relative;
4589 options->objfind = NULL;
4590
4591 /* pathchange left =NULL by default */
4592 options->change = diff_change;
4593 options->add_remove = diff_addremove;
4594 options->use_color = diff_use_color_default;
4595 options->detect_rename = diff_detect_rename_default;
4596 options->xdl_opts |= diff_algorithm;
4597 if (diff_indent_heuristic)
4598 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4599
4600 options->orderfile = diff_order_file_cfg;
4601
4602 if (!options->flags.ignore_submodule_set)
4603 options->flags.ignore_untracked_in_submodules = 1;
4604
4605 if (diff_no_prefix) {
4606 options->a_prefix = options->b_prefix = "";
4607 } else if (!diff_mnemonic_prefix) {
4608 options->a_prefix = "a/";
4609 options->b_prefix = "b/";
4610 }
4611
4612 options->color_moved = diff_color_moved_default;
4613 options->color_moved_ws_handling = diff_color_moved_ws_default;
4614
4615 prep_parse_options(options);
4616 }
4617
4618 void diff_setup_done(struct diff_options *options)
4619 {
4620 unsigned check_mask = DIFF_FORMAT_NAME |
4621 DIFF_FORMAT_NAME_STATUS |
4622 DIFF_FORMAT_CHECKDIFF |
4623 DIFF_FORMAT_NO_OUTPUT;
4624 /*
4625 * This must be signed because we're comparing against a potentially
4626 * negative value.
4627 */
4628 const int hexsz = the_hash_algo->hexsz;
4629
4630 if (options->set_default)
4631 options->set_default(options);
4632
4633 if (HAS_MULTI_BITS(options->output_format & check_mask))
4634 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4635
4636 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4637 die(_("-G, -S and --find-object are mutually exclusive"));
4638
4639 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_G_REGEX_MASK))
4640 die(_("-G and --pickaxe-regex are mutually exclusive, use --pickaxe-regex with -S"));
4641
4642 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_ALL_OBJFIND_MASK))
4643 die(_("---pickaxe-all and --find-object are mutually exclusive, use --pickaxe-all with -G and -S"));
4644
4645 /*
4646 * Most of the time we can say "there are changes"
4647 * only by checking if there are changed paths, but
4648 * --ignore-whitespace* options force us to look
4649 * inside contents.
4650 */
4651
4652 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS) ||
4653 options->ignore_regex_nr)
4654 options->flags.diff_from_contents = 1;
4655 else
4656 options->flags.diff_from_contents = 0;
4657
4658 if (options->flags.find_copies_harder)
4659 options->detect_rename = DIFF_DETECT_COPY;
4660
4661 if (!options->flags.relative_name)
4662 options->prefix = NULL;
4663 if (options->prefix)
4664 options->prefix_length = strlen(options->prefix);
4665 else
4666 options->prefix_length = 0;
4667
4668 if (options->output_format & (DIFF_FORMAT_NAME |
4669 DIFF_FORMAT_NAME_STATUS |
4670 DIFF_FORMAT_CHECKDIFF |
4671 DIFF_FORMAT_NO_OUTPUT))
4672 options->output_format &= ~(DIFF_FORMAT_RAW |
4673 DIFF_FORMAT_NUMSTAT |
4674 DIFF_FORMAT_DIFFSTAT |
4675 DIFF_FORMAT_SHORTSTAT |
4676 DIFF_FORMAT_DIRSTAT |
4677 DIFF_FORMAT_SUMMARY |
4678 DIFF_FORMAT_PATCH);
4679
4680 /*
4681 * These cases always need recursive; we do not drop caller-supplied
4682 * recursive bits for other formats here.
4683 */
4684 if (options->output_format & (DIFF_FORMAT_PATCH |
4685 DIFF_FORMAT_NUMSTAT |
4686 DIFF_FORMAT_DIFFSTAT |
4687 DIFF_FORMAT_SHORTSTAT |
4688 DIFF_FORMAT_DIRSTAT |
4689 DIFF_FORMAT_SUMMARY |
4690 DIFF_FORMAT_CHECKDIFF))
4691 options->flags.recursive = 1;
4692 /*
4693 * Also pickaxe would not work very well if you do not say recursive
4694 */
4695 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4696 options->flags.recursive = 1;
4697 /*
4698 * When patches are generated, submodules diffed against the work tree
4699 * must be checked for dirtiness too so it can be shown in the output
4700 */
4701 if (options->output_format & DIFF_FORMAT_PATCH)
4702 options->flags.dirty_submodules = 1;
4703
4704 if (options->detect_rename && options->rename_limit < 0)
4705 options->rename_limit = diff_rename_limit_default;
4706 if (hexsz < options->abbrev)
4707 options->abbrev = hexsz; /* full */
4708
4709 /*
4710 * It does not make sense to show the first hit we happened
4711 * to have found. It does not make sense not to return with
4712 * exit code in such a case either.
4713 */
4714 if (options->flags.quick) {
4715 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4716 options->flags.exit_with_status = 1;
4717 }
4718
4719 options->diff_path_counter = 0;
4720
4721 if (options->flags.follow_renames && options->pathspec.nr != 1)
4722 die(_("--follow requires exactly one pathspec"));
4723
4724 if (!options->use_color || external_diff())
4725 options->color_moved = 0;
4726
4727 FREE_AND_NULL(options->parseopts);
4728 }
4729
4730 int parse_long_opt(const char *opt, const char **argv,
4731 const char **optarg)
4732 {
4733 const char *arg = argv[0];
4734 if (!skip_prefix(arg, "--", &arg))
4735 return 0;
4736 if (!skip_prefix(arg, opt, &arg))
4737 return 0;
4738 if (*arg == '=') { /* stuck form: --option=value */
4739 *optarg = arg + 1;
4740 return 1;
4741 }
4742 if (*arg != '\0')
4743 return 0;
4744 /* separate form: --option value */
4745 if (!argv[1])
4746 die("Option '--%s' requires a value", opt);
4747 *optarg = argv[1];
4748 return 2;
4749 }
4750
4751 static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4752 {
4753 struct diff_options *options = opt->value;
4754 int width = options->stat_width;
4755 int name_width = options->stat_name_width;
4756 int graph_width = options->stat_graph_width;
4757 int count = options->stat_count;
4758 char *end;
4759
4760 BUG_ON_OPT_NEG(unset);
4761
4762 if (!strcmp(opt->long_name, "stat")) {
4763 if (value) {
4764 width = strtoul(value, &end, 10);
4765 if (*end == ',')
4766 name_width = strtoul(end+1, &end, 10);
4767 if (*end == ',')
4768 count = strtoul(end+1, &end, 10);
4769 if (*end)
4770 return error(_("invalid --stat value: %s"), value);
4771 }
4772 } else if (!strcmp(opt->long_name, "stat-width")) {
4773 width = strtoul(value, &end, 10);
4774 if (*end)
4775 return error(_("%s expects a numerical value"),
4776 opt->long_name);
4777 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4778 name_width = strtoul(value, &end, 10);
4779 if (*end)
4780 return error(_("%s expects a numerical value"),
4781 opt->long_name);
4782 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4783 graph_width = strtoul(value, &end, 10);
4784 if (*end)
4785 return error(_("%s expects a numerical value"),
4786 opt->long_name);
4787 } else if (!strcmp(opt->long_name, "stat-count")) {
4788 count = strtoul(value, &end, 10);
4789 if (*end)
4790 return error(_("%s expects a numerical value"),
4791 opt->long_name);
4792 } else
4793 BUG("%s should not get here", opt->long_name);
4794
4795 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4796 options->stat_name_width = name_width;
4797 options->stat_graph_width = graph_width;
4798 options->stat_width = width;
4799 options->stat_count = count;
4800 return 0;
4801 }
4802
4803 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4804 {
4805 struct strbuf errmsg = STRBUF_INIT;
4806 if (parse_dirstat_params(options, params, &errmsg))
4807 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4808 errmsg.buf);
4809 strbuf_release(&errmsg);
4810 /*
4811 * The caller knows a dirstat-related option is given from the command
4812 * line; allow it to say "return this_function();"
4813 */
4814 options->output_format |= DIFF_FORMAT_DIRSTAT;
4815 return 1;
4816 }
4817
4818 static const char diff_status_letters[] = {
4819 DIFF_STATUS_ADDED,
4820 DIFF_STATUS_COPIED,
4821 DIFF_STATUS_DELETED,
4822 DIFF_STATUS_MODIFIED,
4823 DIFF_STATUS_RENAMED,
4824 DIFF_STATUS_TYPE_CHANGED,
4825 DIFF_STATUS_UNKNOWN,
4826 DIFF_STATUS_UNMERGED,
4827 DIFF_STATUS_FILTER_AON,
4828 DIFF_STATUS_FILTER_BROKEN,
4829 '\0',
4830 };
4831
4832 static unsigned int filter_bit['Z' + 1];
4833
4834 static void prepare_filter_bits(void)
4835 {
4836 int i;
4837
4838 if (!filter_bit[DIFF_STATUS_ADDED]) {
4839 for (i = 0; diff_status_letters[i]; i++)
4840 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4841 }
4842 }
4843
4844 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4845 {
4846 return opt->filter & filter_bit[(int) status];
4847 }
4848
4849 unsigned diff_filter_bit(char status)
4850 {
4851 prepare_filter_bits();
4852 return filter_bit[(int) status];
4853 }
4854
4855 static int diff_opt_diff_filter(const struct option *option,
4856 const char *optarg, int unset)
4857 {
4858 struct diff_options *opt = option->value;
4859 int i, optch;
4860
4861 BUG_ON_OPT_NEG(unset);
4862 prepare_filter_bits();
4863
4864 /*
4865 * If there is a negation e.g. 'd' in the input, and we haven't
4866 * initialized the filter field with another --diff-filter, start
4867 * from full set of bits, except for AON.
4868 */
4869 if (!opt->filter) {
4870 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4871 if (optch < 'a' || 'z' < optch)
4872 continue;
4873 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4874 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4875 break;
4876 }
4877 }
4878
4879 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4880 unsigned int bit;
4881 int negate;
4882
4883 if ('a' <= optch && optch <= 'z') {
4884 negate = 1;
4885 optch = toupper(optch);
4886 } else {
4887 negate = 0;
4888 }
4889
4890 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4891 if (!bit)
4892 return error(_("unknown change class '%c' in --diff-filter=%s"),
4893 optarg[i], optarg);
4894 if (negate)
4895 opt->filter &= ~bit;
4896 else
4897 opt->filter |= bit;
4898 }
4899 return 0;
4900 }
4901
4902 static void enable_patch_output(int *fmt)
4903 {
4904 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4905 *fmt |= DIFF_FORMAT_PATCH;
4906 }
4907
4908 static int diff_opt_ws_error_highlight(const struct option *option,
4909 const char *arg, int unset)
4910 {
4911 struct diff_options *opt = option->value;
4912 int val = parse_ws_error_highlight(arg);
4913
4914 BUG_ON_OPT_NEG(unset);
4915 if (val < 0)
4916 return error(_("unknown value after ws-error-highlight=%.*s"),
4917 -1 - val, arg);
4918 opt->ws_error_highlight = val;
4919 return 0;
4920 }
4921
4922 static int diff_opt_find_object(const struct option *option,
4923 const char *arg, int unset)
4924 {
4925 struct diff_options *opt = option->value;
4926 struct object_id oid;
4927
4928 BUG_ON_OPT_NEG(unset);
4929 if (get_oid(arg, &oid))
4930 return error(_("unable to resolve '%s'"), arg);
4931
4932 if (!opt->objfind)
4933 CALLOC_ARRAY(opt->objfind, 1);
4934
4935 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4936 opt->flags.recursive = 1;
4937 opt->flags.tree_in_recursive = 1;
4938 oidset_insert(opt->objfind, &oid);
4939 return 0;
4940 }
4941
4942 static int diff_opt_anchored(const struct option *opt,
4943 const char *arg, int unset)
4944 {
4945 struct diff_options *options = opt->value;
4946
4947 BUG_ON_OPT_NEG(unset);
4948 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4949 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4950 options->anchors_alloc);
4951 options->anchors[options->anchors_nr++] = xstrdup(arg);
4952 return 0;
4953 }
4954
4955 static int diff_opt_binary(const struct option *opt,
4956 const char *arg, int unset)
4957 {
4958 struct diff_options *options = opt->value;
4959
4960 BUG_ON_OPT_NEG(unset);
4961 BUG_ON_OPT_ARG(arg);
4962 enable_patch_output(&options->output_format);
4963 options->flags.binary = 1;
4964 return 0;
4965 }
4966
4967 static int diff_opt_break_rewrites(const struct option *opt,
4968 const char *arg, int unset)
4969 {
4970 int *break_opt = opt->value;
4971 int opt1, opt2;
4972
4973 BUG_ON_OPT_NEG(unset);
4974 if (!arg)
4975 arg = "";
4976 opt1 = parse_rename_score(&arg);
4977 if (*arg == 0)
4978 opt2 = 0;
4979 else if (*arg != '/')
4980 return error(_("%s expects <n>/<m> form"), opt->long_name);
4981 else {
4982 arg++;
4983 opt2 = parse_rename_score(&arg);
4984 }
4985 if (*arg != 0)
4986 return error(_("%s expects <n>/<m> form"), opt->long_name);
4987 *break_opt = opt1 | (opt2 << 16);
4988 return 0;
4989 }
4990
4991 static int diff_opt_char(const struct option *opt,
4992 const char *arg, int unset)
4993 {
4994 char *value = opt->value;
4995
4996 BUG_ON_OPT_NEG(unset);
4997 if (arg[1])
4998 return error(_("%s expects a character, got '%s'"),
4999 opt->long_name, arg);
5000 *value = arg[0];
5001 return 0;
5002 }
5003
5004 static int diff_opt_color_moved(const struct option *opt,
5005 const char *arg, int unset)
5006 {
5007 struct diff_options *options = opt->value;
5008
5009 if (unset) {
5010 options->color_moved = COLOR_MOVED_NO;
5011 } else if (!arg) {
5012 if (diff_color_moved_default)
5013 options->color_moved = diff_color_moved_default;
5014 if (options->color_moved == COLOR_MOVED_NO)
5015 options->color_moved = COLOR_MOVED_DEFAULT;
5016 } else {
5017 int cm = parse_color_moved(arg);
5018 if (cm < 0)
5019 return error(_("bad --color-moved argument: %s"), arg);
5020 options->color_moved = cm;
5021 }
5022 return 0;
5023 }
5024
5025 static int diff_opt_color_moved_ws(const struct option *opt,
5026 const char *arg, int unset)
5027 {
5028 struct diff_options *options = opt->value;
5029 unsigned cm;
5030
5031 if (unset) {
5032 options->color_moved_ws_handling = 0;
5033 return 0;
5034 }
5035
5036 cm = parse_color_moved_ws(arg);
5037 if (cm & COLOR_MOVED_WS_ERROR)
5038 return error(_("invalid mode '%s' in --color-moved-ws"), arg);
5039 options->color_moved_ws_handling = cm;
5040 return 0;
5041 }
5042
5043 static int diff_opt_color_words(const struct option *opt,
5044 const char *arg, int unset)
5045 {
5046 struct diff_options *options = opt->value;
5047
5048 BUG_ON_OPT_NEG(unset);
5049 options->use_color = 1;
5050 options->word_diff = DIFF_WORDS_COLOR;
5051 options->word_regex = arg;
5052 return 0;
5053 }
5054
5055 static int diff_opt_compact_summary(const struct option *opt,
5056 const char *arg, int unset)
5057 {
5058 struct diff_options *options = opt->value;
5059
5060 BUG_ON_OPT_ARG(arg);
5061 if (unset) {
5062 options->flags.stat_with_summary = 0;
5063 } else {
5064 options->flags.stat_with_summary = 1;
5065 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5066 }
5067 return 0;
5068 }
5069
5070 static int diff_opt_diff_algorithm(const struct option *opt,
5071 const char *arg, int unset)
5072 {
5073 struct diff_options *options = opt->value;
5074 long value = parse_algorithm_value(arg);
5075
5076 BUG_ON_OPT_NEG(unset);
5077 if (value < 0)
5078 return error(_("option diff-algorithm accepts \"myers\", "
5079 "\"minimal\", \"patience\" and \"histogram\""));
5080
5081 /* clear out previous settings */
5082 DIFF_XDL_CLR(options, NEED_MINIMAL);
5083 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5084 options->xdl_opts |= value;
5085 return 0;
5086 }
5087
5088 static int diff_opt_dirstat(const struct option *opt,
5089 const char *arg, int unset)
5090 {
5091 struct diff_options *options = opt->value;
5092
5093 BUG_ON_OPT_NEG(unset);
5094 if (!strcmp(opt->long_name, "cumulative")) {
5095 if (arg)
5096 BUG("how come --cumulative take a value?");
5097 arg = "cumulative";
5098 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
5099 parse_dirstat_opt(options, "files");
5100 parse_dirstat_opt(options, arg ? arg : "");
5101 return 0;
5102 }
5103
5104 static int diff_opt_find_copies(const struct option *opt,
5105 const char *arg, int unset)
5106 {
5107 struct diff_options *options = opt->value;
5108
5109 BUG_ON_OPT_NEG(unset);
5110 if (!arg)
5111 arg = "";
5112 options->rename_score = parse_rename_score(&arg);
5113 if (*arg != 0)
5114 return error(_("invalid argument to %s"), opt->long_name);
5115
5116 if (options->detect_rename == DIFF_DETECT_COPY)
5117 options->flags.find_copies_harder = 1;
5118 else
5119 options->detect_rename = DIFF_DETECT_COPY;
5120
5121 return 0;
5122 }
5123
5124 static int diff_opt_find_renames(const struct option *opt,
5125 const char *arg, int unset)
5126 {
5127 struct diff_options *options = opt->value;
5128
5129 BUG_ON_OPT_NEG(unset);
5130 if (!arg)
5131 arg = "";
5132 options->rename_score = parse_rename_score(&arg);
5133 if (*arg != 0)
5134 return error(_("invalid argument to %s"), opt->long_name);
5135
5136 options->detect_rename = DIFF_DETECT_RENAME;
5137 return 0;
5138 }
5139
5140 static int diff_opt_follow(const struct option *opt,
5141 const char *arg, int unset)
5142 {
5143 struct diff_options *options = opt->value;
5144
5145 BUG_ON_OPT_ARG(arg);
5146 if (unset) {
5147 options->flags.follow_renames = 0;
5148 options->flags.default_follow_renames = 0;
5149 } else {
5150 options->flags.follow_renames = 1;
5151 }
5152 return 0;
5153 }
5154
5155 static int diff_opt_ignore_submodules(const struct option *opt,
5156 const char *arg, int unset)
5157 {
5158 struct diff_options *options = opt->value;
5159
5160 BUG_ON_OPT_NEG(unset);
5161 if (!arg)
5162 arg = "all";
5163 options->flags.override_submodule_config = 1;
5164 handle_ignore_submodules_arg(options, arg);
5165 return 0;
5166 }
5167
5168 static int diff_opt_line_prefix(const struct option *opt,
5169 const char *optarg, int unset)
5170 {
5171 struct diff_options *options = opt->value;
5172
5173 BUG_ON_OPT_NEG(unset);
5174 options->line_prefix = optarg;
5175 options->line_prefix_length = strlen(options->line_prefix);
5176 graph_setup_line_prefix(options);
5177 return 0;
5178 }
5179
5180 static int diff_opt_no_prefix(const struct option *opt,
5181 const char *optarg, int unset)
5182 {
5183 struct diff_options *options = opt->value;
5184
5185 BUG_ON_OPT_NEG(unset);
5186 BUG_ON_OPT_ARG(optarg);
5187 options->a_prefix = "";
5188 options->b_prefix = "";
5189 return 0;
5190 }
5191
5192 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
5193 const struct option *opt,
5194 const char *arg, int unset)
5195 {
5196 struct diff_options *options = opt->value;
5197 char *path;
5198
5199 BUG_ON_OPT_NEG(unset);
5200 path = prefix_filename(ctx->prefix, arg);
5201 options->file = xfopen(path, "w");
5202 options->close_file = 1;
5203 if (options->use_color != GIT_COLOR_ALWAYS)
5204 options->use_color = GIT_COLOR_NEVER;
5205 free(path);
5206 return 0;
5207 }
5208
5209 static int diff_opt_patience(const struct option *opt,
5210 const char *arg, int unset)
5211 {
5212 struct diff_options *options = opt->value;
5213 int i;
5214
5215 BUG_ON_OPT_NEG(unset);
5216 BUG_ON_OPT_ARG(arg);
5217 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5218 /*
5219 * Both --patience and --anchored use PATIENCE_DIFF
5220 * internally, so remove any anchors previously
5221 * specified.
5222 */
5223 for (i = 0; i < options->anchors_nr; i++)
5224 free(options->anchors[i]);
5225 options->anchors_nr = 0;
5226 return 0;
5227 }
5228
5229 static int diff_opt_ignore_regex(const struct option *opt,
5230 const char *arg, int unset)
5231 {
5232 struct diff_options *options = opt->value;
5233 regex_t *regex;
5234
5235 BUG_ON_OPT_NEG(unset);
5236 regex = xmalloc(sizeof(*regex));
5237 if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE))
5238 return error(_("invalid regex given to -I: '%s'"), arg);
5239 ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1,
5240 options->ignore_regex_alloc);
5241 options->ignore_regex[options->ignore_regex_nr++] = regex;
5242 return 0;
5243 }
5244
5245 static int diff_opt_pickaxe_regex(const struct option *opt,
5246 const char *arg, int unset)
5247 {
5248 struct diff_options *options = opt->value;
5249
5250 BUG_ON_OPT_NEG(unset);
5251 options->pickaxe = arg;
5252 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5253 return 0;
5254 }
5255
5256 static int diff_opt_pickaxe_string(const struct option *opt,
5257 const char *arg, int unset)
5258 {
5259 struct diff_options *options = opt->value;
5260
5261 BUG_ON_OPT_NEG(unset);
5262 options->pickaxe = arg;
5263 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5264 return 0;
5265 }
5266
5267 static int diff_opt_relative(const struct option *opt,
5268 const char *arg, int unset)
5269 {
5270 struct diff_options *options = opt->value;
5271
5272 options->flags.relative_name = !unset;
5273 if (arg)
5274 options->prefix = arg;
5275 return 0;
5276 }
5277
5278 static int diff_opt_submodule(const struct option *opt,
5279 const char *arg, int unset)
5280 {
5281 struct diff_options *options = opt->value;
5282
5283 BUG_ON_OPT_NEG(unset);
5284 if (!arg)
5285 arg = "log";
5286 if (parse_submodule_params(options, arg))
5287 return error(_("failed to parse --submodule option parameter: '%s'"),
5288 arg);
5289 return 0;
5290 }
5291
5292 static int diff_opt_textconv(const struct option *opt,
5293 const char *arg, int unset)
5294 {
5295 struct diff_options *options = opt->value;
5296
5297 BUG_ON_OPT_ARG(arg);
5298 if (unset) {
5299 options->flags.allow_textconv = 0;
5300 } else {
5301 options->flags.allow_textconv = 1;
5302 options->flags.textconv_set_via_cmdline = 1;
5303 }
5304 return 0;
5305 }
5306
5307 static int diff_opt_unified(const struct option *opt,
5308 const char *arg, int unset)
5309 {
5310 struct diff_options *options = opt->value;
5311 char *s;
5312
5313 BUG_ON_OPT_NEG(unset);
5314
5315 if (arg) {
5316 options->context = strtol(arg, &s, 10);
5317 if (*s)
5318 return error(_("%s expects a numerical value"), "--unified");
5319 }
5320 enable_patch_output(&options->output_format);
5321
5322 return 0;
5323 }
5324
5325 static int diff_opt_word_diff(const struct option *opt,
5326 const char *arg, int unset)
5327 {
5328 struct diff_options *options = opt->value;
5329
5330 BUG_ON_OPT_NEG(unset);
5331 if (arg) {
5332 if (!strcmp(arg, "plain"))
5333 options->word_diff = DIFF_WORDS_PLAIN;
5334 else if (!strcmp(arg, "color")) {
5335 options->use_color = 1;
5336 options->word_diff = DIFF_WORDS_COLOR;
5337 }
5338 else if (!strcmp(arg, "porcelain"))
5339 options->word_diff = DIFF_WORDS_PORCELAIN;
5340 else if (!strcmp(arg, "none"))
5341 options->word_diff = DIFF_WORDS_NONE;
5342 else
5343 return error(_("bad --word-diff argument: %s"), arg);
5344 } else {
5345 if (options->word_diff == DIFF_WORDS_NONE)
5346 options->word_diff = DIFF_WORDS_PLAIN;
5347 }
5348 return 0;
5349 }
5350
5351 static int diff_opt_word_diff_regex(const struct option *opt,
5352 const char *arg, int unset)
5353 {
5354 struct diff_options *options = opt->value;
5355
5356 BUG_ON_OPT_NEG(unset);
5357 if (options->word_diff == DIFF_WORDS_NONE)
5358 options->word_diff = DIFF_WORDS_PLAIN;
5359 options->word_regex = arg;
5360 return 0;
5361 }
5362
5363 static int diff_opt_rotate_to(const struct option *opt, const char *arg, int unset)
5364 {
5365 struct diff_options *options = opt->value;
5366
5367 BUG_ON_OPT_NEG(unset);
5368 if (!strcmp(opt->long_name, "skip-to"))
5369 options->skip_instead_of_rotate = 1;
5370 else
5371 options->skip_instead_of_rotate = 0;
5372 options->rotate_to = arg;
5373 return 0;
5374 }
5375
5376 static void prep_parse_options(struct diff_options *options)
5377 {
5378 struct option parseopts[] = {
5379 OPT_GROUP(N_("Diff output format options")),
5380 OPT_BITOP('p', "patch", &options->output_format,
5381 N_("generate patch"),
5382 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5383 OPT_BIT_F('s', "no-patch", &options->output_format,
5384 N_("suppress diff output"),
5385 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
5386 OPT_BITOP('u', NULL, &options->output_format,
5387 N_("generate patch"),
5388 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5389 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
5390 N_("generate diffs with <n> lines context"),
5391 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
5392 OPT_BOOL('W', "function-context", &options->flags.funccontext,
5393 N_("generate diffs with <n> lines context")),
5394 OPT_BIT_F(0, "raw", &options->output_format,
5395 N_("generate the diff in raw format"),
5396 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
5397 OPT_BITOP(0, "patch-with-raw", &options->output_format,
5398 N_("synonym for '-p --raw'"),
5399 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
5400 DIFF_FORMAT_NO_OUTPUT),
5401 OPT_BITOP(0, "patch-with-stat", &options->output_format,
5402 N_("synonym for '-p --stat'"),
5403 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
5404 DIFF_FORMAT_NO_OUTPUT),
5405 OPT_BIT_F(0, "numstat", &options->output_format,
5406 N_("machine friendly --stat"),
5407 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
5408 OPT_BIT_F(0, "shortstat", &options->output_format,
5409 N_("output only the last line of --stat"),
5410 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
5411 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
5412 N_("output the distribution of relative amount of changes for each sub-directory"),
5413 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5414 diff_opt_dirstat),
5415 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5416 N_("synonym for --dirstat=cumulative"),
5417 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5418 diff_opt_dirstat),
5419 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5420 N_("synonym for --dirstat=files,param1,param2..."),
5421 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5422 diff_opt_dirstat),
5423 OPT_BIT_F(0, "check", &options->output_format,
5424 N_("warn if changes introduce conflict markers or whitespace errors"),
5425 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
5426 OPT_BIT_F(0, "summary", &options->output_format,
5427 N_("condensed summary such as creations, renames and mode changes"),
5428 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
5429 OPT_BIT_F(0, "name-only", &options->output_format,
5430 N_("show only names of changed files"),
5431 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
5432 OPT_BIT_F(0, "name-status", &options->output_format,
5433 N_("show only names and status of changed files"),
5434 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
5435 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5436 N_("generate diffstat"),
5437 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5438 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5439 N_("generate diffstat with a given width"),
5440 PARSE_OPT_NONEG, diff_opt_stat),
5441 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5442 N_("generate diffstat with a given name width"),
5443 PARSE_OPT_NONEG, diff_opt_stat),
5444 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5445 N_("generate diffstat with a given graph width"),
5446 PARSE_OPT_NONEG, diff_opt_stat),
5447 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5448 N_("generate diffstat with limited lines"),
5449 PARSE_OPT_NONEG, diff_opt_stat),
5450 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5451 N_("generate compact summary in diffstat"),
5452 PARSE_OPT_NOARG, diff_opt_compact_summary),
5453 OPT_CALLBACK_F(0, "binary", options, NULL,
5454 N_("output a binary diff that can be applied"),
5455 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
5456 OPT_BOOL(0, "full-index", &options->flags.full_index,
5457 N_("show full pre- and post-image object names on the \"index\" lines")),
5458 OPT_COLOR_FLAG(0, "color", &options->use_color,
5459 N_("show colored diff")),
5460 OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
5461 N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
5462 PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
5463 OPT_SET_INT('z', NULL, &options->line_termination,
5464 N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
5465 0),
5466 OPT__ABBREV(&options->abbrev),
5467 OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
5468 N_("show the given source prefix instead of \"a/\""),
5469 PARSE_OPT_NONEG),
5470 OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
5471 N_("show the given destination prefix instead of \"b/\""),
5472 PARSE_OPT_NONEG),
5473 OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
5474 N_("prepend an additional prefix to every line of output"),
5475 PARSE_OPT_NONEG, diff_opt_line_prefix),
5476 OPT_CALLBACK_F(0, "no-prefix", options, NULL,
5477 N_("do not show any source or destination prefix"),
5478 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
5479 OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
5480 N_("show context between diff hunks up to the specified number of lines"),
5481 PARSE_OPT_NONEG),
5482 OPT_CALLBACK_F(0, "output-indicator-new",
5483 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5484 N_("<char>"),
5485 N_("specify the character to indicate a new line instead of '+'"),
5486 PARSE_OPT_NONEG, diff_opt_char),
5487 OPT_CALLBACK_F(0, "output-indicator-old",
5488 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5489 N_("<char>"),
5490 N_("specify the character to indicate an old line instead of '-'"),
5491 PARSE_OPT_NONEG, diff_opt_char),
5492 OPT_CALLBACK_F(0, "output-indicator-context",
5493 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5494 N_("<char>"),
5495 N_("specify the character to indicate a context instead of ' '"),
5496 PARSE_OPT_NONEG, diff_opt_char),
5497
5498 OPT_GROUP(N_("Diff rename options")),
5499 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5500 N_("break complete rewrite changes into pairs of delete and create"),
5501 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5502 diff_opt_break_rewrites),
5503 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5504 N_("detect renames"),
5505 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5506 diff_opt_find_renames),
5507 OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
5508 N_("omit the preimage for deletes"),
5509 1, PARSE_OPT_NONEG),
5510 OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
5511 N_("detect copies"),
5512 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5513 diff_opt_find_copies),
5514 OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
5515 N_("use unmodified files as source to find copies")),
5516 OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
5517 N_("disable rename detection"),
5518 0, PARSE_OPT_NONEG),
5519 OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
5520 N_("use empty blobs as rename source")),
5521 OPT_CALLBACK_F(0, "follow", options, NULL,
5522 N_("continue listing the history of a file beyond renames"),
5523 PARSE_OPT_NOARG, diff_opt_follow),
5524 OPT_INTEGER('l', NULL, &options->rename_limit,
5525 N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
5526
5527 OPT_GROUP(N_("Diff algorithm options")),
5528 OPT_BIT(0, "minimal", &options->xdl_opts,
5529 N_("produce the smallest possible diff"),
5530 XDF_NEED_MINIMAL),
5531 OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
5532 N_("ignore whitespace when comparing lines"),
5533 XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
5534 OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
5535 N_("ignore changes in amount of whitespace"),
5536 XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
5537 OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
5538 N_("ignore changes in whitespace at EOL"),
5539 XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
5540 OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
5541 N_("ignore carrier-return at the end of line"),
5542 XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
5543 OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
5544 N_("ignore changes whose lines are all blank"),
5545 XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
5546 OPT_CALLBACK_F('I', "ignore-matching-lines", options, N_("<regex>"),
5547 N_("ignore changes whose all lines match <regex>"),
5548 0, diff_opt_ignore_regex),
5549 OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
5550 N_("heuristic to shift diff hunk boundaries for easy reading"),
5551 XDF_INDENT_HEURISTIC),
5552 OPT_CALLBACK_F(0, "patience", options, NULL,
5553 N_("generate diff using the \"patience diff\" algorithm"),
5554 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5555 diff_opt_patience),
5556 OPT_BITOP(0, "histogram", &options->xdl_opts,
5557 N_("generate diff using the \"histogram diff\" algorithm"),
5558 XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
5559 OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
5560 N_("choose a diff algorithm"),
5561 PARSE_OPT_NONEG, diff_opt_diff_algorithm),
5562 OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
5563 N_("generate diff using the \"anchored diff\" algorithm"),
5564 PARSE_OPT_NONEG, diff_opt_anchored),
5565 OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
5566 N_("show word diff, using <mode> to delimit changed words"),
5567 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
5568 OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
5569 N_("use <regex> to decide what a word is"),
5570 PARSE_OPT_NONEG, diff_opt_word_diff_regex),
5571 OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
5572 N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
5573 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
5574 OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
5575 N_("moved lines of code are colored differently"),
5576 PARSE_OPT_OPTARG, diff_opt_color_moved),
5577 OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
5578 N_("how white spaces are ignored in --color-moved"),
5579 0, diff_opt_color_moved_ws),
5580
5581 OPT_GROUP(N_("Other diff options")),
5582 OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
5583 N_("when run from subdir, exclude changes outside and show relative paths"),
5584 PARSE_OPT_OPTARG,
5585 diff_opt_relative),
5586 OPT_BOOL('a', "text", &options->flags.text,
5587 N_("treat all files as text")),
5588 OPT_BOOL('R', NULL, &options->flags.reverse_diff,
5589 N_("swap two inputs, reverse the diff")),
5590 OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
5591 N_("exit with 1 if there were differences, 0 otherwise")),
5592 OPT_BOOL(0, "quiet", &options->flags.quick,
5593 N_("disable all output of the program")),
5594 OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
5595 N_("allow an external diff helper to be executed")),
5596 OPT_CALLBACK_F(0, "textconv", options, NULL,
5597 N_("run external text conversion filters when comparing binary files"),
5598 PARSE_OPT_NOARG, diff_opt_textconv),
5599 OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
5600 N_("ignore changes to submodules in the diff generation"),
5601 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5602 diff_opt_ignore_submodules),
5603 OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
5604 N_("specify how differences in submodules are shown"),
5605 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5606 diff_opt_submodule),
5607 OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
5608 N_("hide 'git add -N' entries from the index"),
5609 1, PARSE_OPT_NONEG),
5610 OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
5611 N_("treat 'git add -N' entries as real in the index"),
5612 0, PARSE_OPT_NONEG),
5613 OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
5614 N_("look for differences that change the number of occurrences of the specified string"),
5615 0, diff_opt_pickaxe_string),
5616 OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
5617 N_("look for differences that change the number of occurrences of the specified regex"),
5618 0, diff_opt_pickaxe_regex),
5619 OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
5620 N_("show all changes in the changeset with -S or -G"),
5621 DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
5622 OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
5623 N_("treat <string> in -S as extended POSIX regular expression"),
5624 DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
5625 OPT_FILENAME('O', NULL, &options->orderfile,
5626 N_("control the order in which files appear in the output")),
5627 OPT_CALLBACK_F(0, "rotate-to", options, N_("<path>"),
5628 N_("show the change in the specified path first"),
5629 PARSE_OPT_NONEG, diff_opt_rotate_to),
5630 OPT_CALLBACK_F(0, "skip-to", options, N_("<path>"),
5631 N_("skip the output to the specified path"),
5632 PARSE_OPT_NONEG, diff_opt_rotate_to),
5633 OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
5634 N_("look for differences that change the number of occurrences of the specified object"),
5635 PARSE_OPT_NONEG, diff_opt_find_object),
5636 OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
5637 N_("select files by diff type"),
5638 PARSE_OPT_NONEG, diff_opt_diff_filter),
5639 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5640 N_("Output to a specific file"),
5641 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5642
5643 OPT_END()
5644 };
5645
5646 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5647 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5648 }
5649
5650 int diff_opt_parse(struct diff_options *options,
5651 const char **av, int ac, const char *prefix)
5652 {
5653 if (!prefix)
5654 prefix = "";
5655
5656 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5657 PARSE_OPT_KEEP_DASHDASH |
5658 PARSE_OPT_KEEP_UNKNOWN |
5659 PARSE_OPT_NO_INTERNAL_HELP |
5660 PARSE_OPT_ONE_SHOT |
5661 PARSE_OPT_STOP_AT_NON_OPTION);
5662
5663 return ac;
5664 }
5665
5666 int parse_rename_score(const char **cp_p)
5667 {
5668 unsigned long num, scale;
5669 int ch, dot;
5670 const char *cp = *cp_p;
5671
5672 num = 0;
5673 scale = 1;
5674 dot = 0;
5675 for (;;) {
5676 ch = *cp;
5677 if ( !dot && ch == '.' ) {
5678 scale = 1;
5679 dot = 1;
5680 } else if ( ch == '%' ) {
5681 scale = dot ? scale*100 : 100;
5682 cp++; /* % is always at the end */
5683 break;
5684 } else if ( ch >= '0' && ch <= '9' ) {
5685 if ( scale < 100000 ) {
5686 scale *= 10;
5687 num = (num*10) + (ch-'0');
5688 }
5689 } else {
5690 break;
5691 }
5692 cp++;
5693 }
5694 *cp_p = cp;
5695
5696 /* user says num divided by scale and we say internally that
5697 * is MAX_SCORE * num / scale.
5698 */
5699 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5700 }
5701
5702 struct diff_queue_struct diff_queued_diff;
5703
5704 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5705 {
5706 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5707 queue->queue[queue->nr++] = dp;
5708 }
5709
5710 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5711 struct diff_filespec *one,
5712 struct diff_filespec *two)
5713 {
5714 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5715 dp->one = one;
5716 dp->two = two;
5717 if (queue)
5718 diff_q(queue, dp);
5719 return dp;
5720 }
5721
5722 void diff_free_filepair(struct diff_filepair *p)
5723 {
5724 free_filespec(p->one);
5725 free_filespec(p->two);
5726 free(p);
5727 }
5728
5729 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5730 {
5731 int abblen;
5732 const char *abbrev;
5733
5734 /* Do we want all 40 hex characters? */
5735 if (len == the_hash_algo->hexsz)
5736 return oid_to_hex(oid);
5737
5738 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5739 abbrev = diff_abbrev_oid(oid, len);
5740
5741 if (!print_sha1_ellipsis())
5742 return abbrev;
5743
5744 abblen = strlen(abbrev);
5745
5746 /*
5747 * In well-behaved cases, where the abbreviated result is the
5748 * same as the requested length, append three dots after the
5749 * abbreviation (hence the whole logic is limited to the case
5750 * where abblen < 37); when the actual abbreviated result is a
5751 * bit longer than the requested length, we reduce the number
5752 * of dots so that they match the well-behaved ones. However,
5753 * if the actual abbreviation is longer than the requested
5754 * length by more than three, we give up on aligning, and add
5755 * three dots anyway, to indicate that the output is not the
5756 * full object name. Yes, this may be suboptimal, but this
5757 * appears only in "diff --raw --abbrev" output and it is not
5758 * worth the effort to change it now. Note that this would
5759 * likely to work fine when the automatic sizing of default
5760 * abbreviation length is used--we would be fed -1 in "len" in
5761 * that case, and will end up always appending three-dots, but
5762 * the automatic sizing is supposed to give abblen that ensures
5763 * uniqueness across all objects (statistically speaking).
5764 */
5765 if (abblen < the_hash_algo->hexsz - 3) {
5766 static char hex[GIT_MAX_HEXSZ + 1];
5767 if (len < abblen && abblen <= len + 2)
5768 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5769 else
5770 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5771 return hex;
5772 }
5773
5774 return oid_to_hex(oid);
5775 }
5776
5777 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5778 {
5779 int line_termination = opt->line_termination;
5780 int inter_name_termination = line_termination ? '\t' : '\0';
5781
5782 fprintf(opt->file, "%s", diff_line_prefix(opt));
5783 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5784 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5785 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5786 fprintf(opt->file, "%s ",
5787 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5788 }
5789 if (p->score) {
5790 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5791 inter_name_termination);
5792 } else {
5793 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5794 }
5795
5796 if (p->status == DIFF_STATUS_COPIED ||
5797 p->status == DIFF_STATUS_RENAMED) {
5798 const char *name_a, *name_b;
5799 name_a = p->one->path;
5800 name_b = p->two->path;
5801 strip_prefix(opt->prefix_length, &name_a, &name_b);
5802 write_name_quoted(name_a, opt->file, inter_name_termination);
5803 write_name_quoted(name_b, opt->file, line_termination);
5804 } else {
5805 const char *name_a, *name_b;
5806 name_a = p->one->mode ? p->one->path : p->two->path;
5807 name_b = NULL;
5808 strip_prefix(opt->prefix_length, &name_a, &name_b);
5809 write_name_quoted(name_a, opt->file, line_termination);
5810 }
5811 }
5812
5813 int diff_unmodified_pair(struct diff_filepair *p)
5814 {
5815 /* This function is written stricter than necessary to support
5816 * the currently implemented transformers, but the idea is to
5817 * let transformers to produce diff_filepairs any way they want,
5818 * and filter and clean them up here before producing the output.
5819 */
5820 struct diff_filespec *one = p->one, *two = p->two;
5821
5822 if (DIFF_PAIR_UNMERGED(p))
5823 return 0; /* unmerged is interesting */
5824
5825 /* deletion, addition, mode or type change
5826 * and rename are all interesting.
5827 */
5828 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5829 DIFF_PAIR_MODE_CHANGED(p) ||
5830 strcmp(one->path, two->path))
5831 return 0;
5832
5833 /* both are valid and point at the same path. that is, we are
5834 * dealing with a change.
5835 */
5836 if (one->oid_valid && two->oid_valid &&
5837 oideq(&one->oid, &two->oid) &&
5838 !one->dirty_submodule && !two->dirty_submodule)
5839 return 1; /* no change */
5840 if (!one->oid_valid && !two->oid_valid)
5841 return 1; /* both look at the same file on the filesystem. */
5842 return 0;
5843 }
5844
5845 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5846 {
5847 if (diff_unmodified_pair(p))
5848 return;
5849
5850 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5851 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5852 return; /* no tree diffs in patch format */
5853
5854 run_diff(p, o);
5855 }
5856
5857 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5858 struct diffstat_t *diffstat)
5859 {
5860 if (diff_unmodified_pair(p))
5861 return;
5862
5863 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5864 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5865 return; /* no useful stat for tree diffs */
5866
5867 run_diffstat(p, o, diffstat);
5868 }
5869
5870 static void diff_flush_checkdiff(struct diff_filepair *p,
5871 struct diff_options *o)
5872 {
5873 if (diff_unmodified_pair(p))
5874 return;
5875
5876 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5877 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5878 return; /* nothing to check in tree diffs */
5879
5880 run_checkdiff(p, o);
5881 }
5882
5883 int diff_queue_is_empty(void)
5884 {
5885 struct diff_queue_struct *q = &diff_queued_diff;
5886 int i;
5887 for (i = 0; i < q->nr; i++)
5888 if (!diff_unmodified_pair(q->queue[i]))
5889 return 0;
5890 return 1;
5891 }
5892
5893 #if DIFF_DEBUG
5894 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5895 {
5896 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5897 x, one ? one : "",
5898 s->path,
5899 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5900 s->mode,
5901 s->oid_valid ? oid_to_hex(&s->oid) : "");
5902 fprintf(stderr, "queue[%d] %s size %lu\n",
5903 x, one ? one : "",
5904 s->size);
5905 }
5906
5907 void diff_debug_filepair(const struct diff_filepair *p, int i)
5908 {
5909 diff_debug_filespec(p->one, i, "one");
5910 diff_debug_filespec(p->two, i, "two");
5911 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5912 p->score, p->status ? p->status : '?',
5913 p->one->rename_used, p->broken_pair);
5914 }
5915
5916 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5917 {
5918 int i;
5919 if (msg)
5920 fprintf(stderr, "%s\n", msg);
5921 fprintf(stderr, "q->nr = %d\n", q->nr);
5922 for (i = 0; i < q->nr; i++) {
5923 struct diff_filepair *p = q->queue[i];
5924 diff_debug_filepair(p, i);
5925 }
5926 }
5927 #endif
5928
5929 static void diff_resolve_rename_copy(void)
5930 {
5931 int i;
5932 struct diff_filepair *p;
5933 struct diff_queue_struct *q = &diff_queued_diff;
5934
5935 diff_debug_queue("resolve-rename-copy", q);
5936
5937 for (i = 0; i < q->nr; i++) {
5938 p = q->queue[i];
5939 p->status = 0; /* undecided */
5940 if (DIFF_PAIR_UNMERGED(p))
5941 p->status = DIFF_STATUS_UNMERGED;
5942 else if (!DIFF_FILE_VALID(p->one))
5943 p->status = DIFF_STATUS_ADDED;
5944 else if (!DIFF_FILE_VALID(p->two))
5945 p->status = DIFF_STATUS_DELETED;
5946 else if (DIFF_PAIR_TYPE_CHANGED(p))
5947 p->status = DIFF_STATUS_TYPE_CHANGED;
5948
5949 /* from this point on, we are dealing with a pair
5950 * whose both sides are valid and of the same type, i.e.
5951 * either in-place edit or rename/copy edit.
5952 */
5953 else if (DIFF_PAIR_RENAME(p)) {
5954 /*
5955 * A rename might have re-connected a broken
5956 * pair up, causing the pathnames to be the
5957 * same again. If so, that's not a rename at
5958 * all, just a modification..
5959 *
5960 * Otherwise, see if this source was used for
5961 * multiple renames, in which case we decrement
5962 * the count, and call it a copy.
5963 */
5964 if (!strcmp(p->one->path, p->two->path))
5965 p->status = DIFF_STATUS_MODIFIED;
5966 else if (--p->one->rename_used > 0)
5967 p->status = DIFF_STATUS_COPIED;
5968 else
5969 p->status = DIFF_STATUS_RENAMED;
5970 }
5971 else if (!oideq(&p->one->oid, &p->two->oid) ||
5972 p->one->mode != p->two->mode ||
5973 p->one->dirty_submodule ||
5974 p->two->dirty_submodule ||
5975 is_null_oid(&p->one->oid))
5976 p->status = DIFF_STATUS_MODIFIED;
5977 else {
5978 /* This is a "no-change" entry and should not
5979 * happen anymore, but prepare for broken callers.
5980 */
5981 error("feeding unmodified %s to diffcore",
5982 p->one->path);
5983 p->status = DIFF_STATUS_UNKNOWN;
5984 }
5985 }
5986 diff_debug_queue("resolve-rename-copy done", q);
5987 }
5988
5989 static int check_pair_status(struct diff_filepair *p)
5990 {
5991 switch (p->status) {
5992 case DIFF_STATUS_UNKNOWN:
5993 return 0;
5994 case 0:
5995 die("internal error in diff-resolve-rename-copy");
5996 default:
5997 return 1;
5998 }
5999 }
6000
6001 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
6002 {
6003 int fmt = opt->output_format;
6004
6005 if (fmt & DIFF_FORMAT_CHECKDIFF)
6006 diff_flush_checkdiff(p, opt);
6007 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
6008 diff_flush_raw(p, opt);
6009 else if (fmt & DIFF_FORMAT_NAME) {
6010 const char *name_a, *name_b;
6011 name_a = p->two->path;
6012 name_b = NULL;
6013 strip_prefix(opt->prefix_length, &name_a, &name_b);
6014 fprintf(opt->file, "%s", diff_line_prefix(opt));
6015 write_name_quoted(name_a, opt->file, opt->line_termination);
6016 }
6017 }
6018
6019 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
6020 {
6021 struct strbuf sb = STRBUF_INIT;
6022 if (fs->mode)
6023 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
6024 else
6025 strbuf_addf(&sb, " %s ", newdelete);
6026
6027 quote_c_style(fs->path, &sb, NULL, 0);
6028 strbuf_addch(&sb, '\n');
6029 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6030 sb.buf, sb.len, 0);
6031 strbuf_release(&sb);
6032 }
6033
6034 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
6035 int show_name)
6036 {
6037 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
6038 struct strbuf sb = STRBUF_INIT;
6039 strbuf_addf(&sb, " mode change %06o => %06o",
6040 p->one->mode, p->two->mode);
6041 if (show_name) {
6042 strbuf_addch(&sb, ' ');
6043 quote_c_style(p->two->path, &sb, NULL, 0);
6044 }
6045 strbuf_addch(&sb, '\n');
6046 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6047 sb.buf, sb.len, 0);
6048 strbuf_release(&sb);
6049 }
6050 }
6051
6052 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
6053 struct diff_filepair *p)
6054 {
6055 struct strbuf sb = STRBUF_INIT;
6056 struct strbuf names = STRBUF_INIT;
6057
6058 pprint_rename(&names, p->one->path, p->two->path);
6059 strbuf_addf(&sb, " %s %s (%d%%)\n",
6060 renamecopy, names.buf, similarity_index(p));
6061 strbuf_release(&names);
6062 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6063 sb.buf, sb.len, 0);
6064 show_mode_change(opt, p, 0);
6065 strbuf_release(&sb);
6066 }
6067
6068 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
6069 {
6070 switch(p->status) {
6071 case DIFF_STATUS_DELETED:
6072 show_file_mode_name(opt, "delete", p->one);
6073 break;
6074 case DIFF_STATUS_ADDED:
6075 show_file_mode_name(opt, "create", p->two);
6076 break;
6077 case DIFF_STATUS_COPIED:
6078 show_rename_copy(opt, "copy", p);
6079 break;
6080 case DIFF_STATUS_RENAMED:
6081 show_rename_copy(opt, "rename", p);
6082 break;
6083 default:
6084 if (p->score) {
6085 struct strbuf sb = STRBUF_INIT;
6086 strbuf_addstr(&sb, " rewrite ");
6087 quote_c_style(p->two->path, &sb, NULL, 0);
6088 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
6089 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6090 sb.buf, sb.len, 0);
6091 strbuf_release(&sb);
6092 }
6093 show_mode_change(opt, p, !p->score);
6094 break;
6095 }
6096 }
6097
6098 struct patch_id_t {
6099 git_hash_ctx *ctx;
6100 int patchlen;
6101 };
6102
6103 static int remove_space(char *line, int len)
6104 {
6105 int i;
6106 char *dst = line;
6107 unsigned char c;
6108
6109 for (i = 0; i < len; i++)
6110 if (!isspace((c = line[i])))
6111 *dst++ = c;
6112
6113 return dst - line;
6114 }
6115
6116 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
6117 {
6118 unsigned char hash[GIT_MAX_RAWSZ];
6119 unsigned short carry = 0;
6120 int i;
6121
6122 the_hash_algo->final_fn(hash, ctx);
6123 the_hash_algo->init_fn(ctx);
6124 /* 20-byte sum, with carry */
6125 for (i = 0; i < the_hash_algo->rawsz; ++i) {
6126 carry += result->hash[i] + hash[i];
6127 result->hash[i] = carry;
6128 carry >>= 8;
6129 }
6130 }
6131
6132 static int patch_id_consume(void *priv, char *line, unsigned long len)
6133 {
6134 struct patch_id_t *data = priv;
6135 int new_len;
6136
6137 if (len > 12 && starts_with(line, "\\ "))
6138 return 0;
6139 new_len = remove_space(line, len);
6140
6141 the_hash_algo->update_fn(data->ctx, line, new_len);
6142 data->patchlen += new_len;
6143 return 0;
6144 }
6145
6146 static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
6147 {
6148 the_hash_algo->update_fn(ctx, str, strlen(str));
6149 }
6150
6151 static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
6152 {
6153 /* large enough for 2^32 in octal */
6154 char buf[12];
6155 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
6156 the_hash_algo->update_fn(ctx, buf, len);
6157 }
6158
6159 /* returns 0 upon success, and writes result into oid */
6160 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6161 {
6162 struct diff_queue_struct *q = &diff_queued_diff;
6163 int i;
6164 git_hash_ctx ctx;
6165 struct patch_id_t data;
6166
6167 the_hash_algo->init_fn(&ctx);
6168 memset(&data, 0, sizeof(struct patch_id_t));
6169 data.ctx = &ctx;
6170 oidclr(oid);
6171
6172 for (i = 0; i < q->nr; i++) {
6173 xpparam_t xpp;
6174 xdemitconf_t xecfg;
6175 mmfile_t mf1, mf2;
6176 struct diff_filepair *p = q->queue[i];
6177 int len1, len2;
6178
6179 memset(&xpp, 0, sizeof(xpp));
6180 memset(&xecfg, 0, sizeof(xecfg));
6181 if (p->status == 0)
6182 return error("internal diff status error");
6183 if (p->status == DIFF_STATUS_UNKNOWN)
6184 continue;
6185 if (diff_unmodified_pair(p))
6186 continue;
6187 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
6188 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
6189 continue;
6190 if (DIFF_PAIR_UNMERGED(p))
6191 continue;
6192
6193 diff_fill_oid_info(p->one, options->repo->index);
6194 diff_fill_oid_info(p->two, options->repo->index);
6195
6196 len1 = remove_space(p->one->path, strlen(p->one->path));
6197 len2 = remove_space(p->two->path, strlen(p->two->path));
6198 patch_id_add_string(&ctx, "diff--git");
6199 patch_id_add_string(&ctx, "a/");
6200 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6201 patch_id_add_string(&ctx, "b/");
6202 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6203
6204 if (p->one->mode == 0) {
6205 patch_id_add_string(&ctx, "newfilemode");
6206 patch_id_add_mode(&ctx, p->two->mode);
6207 patch_id_add_string(&ctx, "---/dev/null");
6208 patch_id_add_string(&ctx, "+++b/");
6209 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6210 } else if (p->two->mode == 0) {
6211 patch_id_add_string(&ctx, "deletedfilemode");
6212 patch_id_add_mode(&ctx, p->one->mode);
6213 patch_id_add_string(&ctx, "---a/");
6214 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6215 patch_id_add_string(&ctx, "+++/dev/null");
6216 } else {
6217 patch_id_add_string(&ctx, "---a/");
6218 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6219 patch_id_add_string(&ctx, "+++b/");
6220 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6221 }
6222
6223 if (diff_header_only)
6224 continue;
6225
6226 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
6227 fill_mmfile(options->repo, &mf2, p->two) < 0)
6228 return error("unable to read files to diff");
6229
6230 if (diff_filespec_is_binary(options->repo, p->one) ||
6231 diff_filespec_is_binary(options->repo, p->two)) {
6232 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
6233 the_hash_algo->hexsz);
6234 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
6235 the_hash_algo->hexsz);
6236 continue;
6237 }
6238
6239 xpp.flags = 0;
6240 xecfg.ctxlen = 3;
6241 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
6242 if (xdi_diff_outf(&mf1, &mf2, NULL,
6243 patch_id_consume, &data, &xpp, &xecfg))
6244 return error("unable to generate patch-id diff for %s",
6245 p->one->path);
6246
6247 if (stable)
6248 flush_one_hunk(oid, &ctx);
6249 }
6250
6251 if (!stable)
6252 the_hash_algo->final_oid_fn(oid, &ctx);
6253
6254 return 0;
6255 }
6256
6257 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6258 {
6259 struct diff_queue_struct *q = &diff_queued_diff;
6260 int i;
6261 int result = diff_get_patch_id(options, oid, diff_header_only, stable);
6262
6263 for (i = 0; i < q->nr; i++)
6264 diff_free_filepair(q->queue[i]);
6265
6266 free(q->queue);
6267 DIFF_QUEUE_CLEAR(q);
6268
6269 return result;
6270 }
6271
6272 static int is_summary_empty(const struct diff_queue_struct *q)
6273 {
6274 int i;
6275
6276 for (i = 0; i < q->nr; i++) {
6277 const struct diff_filepair *p = q->queue[i];
6278
6279 switch (p->status) {
6280 case DIFF_STATUS_DELETED:
6281 case DIFF_STATUS_ADDED:
6282 case DIFF_STATUS_COPIED:
6283 case DIFF_STATUS_RENAMED:
6284 return 0;
6285 default:
6286 if (p->score)
6287 return 0;
6288 if (p->one->mode && p->two->mode &&
6289 p->one->mode != p->two->mode)
6290 return 0;
6291 break;
6292 }
6293 }
6294 return 1;
6295 }
6296
6297 static const char rename_limit_warning[] =
6298 N_("inexact rename detection was skipped due to too many files.");
6299
6300 static const char degrade_cc_to_c_warning[] =
6301 N_("only found copies from modified paths due to too many files.");
6302
6303 static const char rename_limit_advice[] =
6304 N_("you may want to set your %s variable to at least "
6305 "%d and retry the command.");
6306
6307 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
6308 {
6309 fflush(stdout);
6310 if (degraded_cc)
6311 warning(_(degrade_cc_to_c_warning));
6312 else if (needed)
6313 warning(_(rename_limit_warning));
6314 else
6315 return;
6316 if (0 < needed)
6317 warning(_(rename_limit_advice), varname, needed);
6318 }
6319
6320 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
6321 {
6322 int i;
6323 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
6324 struct diff_queue_struct *q = &diff_queued_diff;
6325
6326 if (WSEH_NEW & WS_RULE_MASK)
6327 BUG("WS rules bit mask overlaps with diff symbol flags");
6328
6329 if (o->color_moved)
6330 o->emitted_symbols = &esm;
6331
6332 for (i = 0; i < q->nr; i++) {
6333 struct diff_filepair *p = q->queue[i];
6334 if (check_pair_status(p))
6335 diff_flush_patch(p, o);
6336 }
6337
6338 if (o->emitted_symbols) {
6339 if (o->color_moved) {
6340 struct hashmap add_lines, del_lines;
6341
6342 if (o->color_moved_ws_handling &
6343 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
6344 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
6345
6346 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
6347 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
6348
6349 add_lines_to_move_detection(o, &add_lines, &del_lines);
6350 mark_color_as_moved(o, &add_lines, &del_lines);
6351 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6352 dim_moved_lines(o);
6353
6354 hashmap_clear_and_free(&add_lines, struct moved_entry,
6355 ent);
6356 hashmap_clear_and_free(&del_lines, struct moved_entry,
6357 ent);
6358 }
6359
6360 for (i = 0; i < esm.nr; i++)
6361 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6362
6363 for (i = 0; i < esm.nr; i++)
6364 free((void *)esm.buf[i].line);
6365 esm.nr = 0;
6366
6367 o->emitted_symbols = NULL;
6368 }
6369 }
6370
6371 static void diff_free_file(struct diff_options *options)
6372 {
6373 if (options->close_file)
6374 fclose(options->file);
6375 }
6376
6377 static void diff_free_ignore_regex(struct diff_options *options)
6378 {
6379 int i;
6380
6381 for (i = 0; i < options->ignore_regex_nr; i++) {
6382 regfree(options->ignore_regex[i]);
6383 free(options->ignore_regex[i]);
6384 }
6385 free(options->ignore_regex);
6386 }
6387
6388 void diff_free(struct diff_options *options)
6389 {
6390 if (options->no_free)
6391 return;
6392
6393 diff_free_file(options);
6394 diff_free_ignore_regex(options);
6395 }
6396
6397 void diff_flush(struct diff_options *options)
6398 {
6399 struct diff_queue_struct *q = &diff_queued_diff;
6400 int i, output_format = options->output_format;
6401 int separator = 0;
6402 int dirstat_by_line = 0;
6403
6404 /*
6405 * Order: raw, stat, summary, patch
6406 * or: name/name-status/checkdiff (other bits clear)
6407 */
6408 if (!q->nr)
6409 goto free_queue;
6410
6411 if (output_format & (DIFF_FORMAT_RAW |
6412 DIFF_FORMAT_NAME |
6413 DIFF_FORMAT_NAME_STATUS |
6414 DIFF_FORMAT_CHECKDIFF)) {
6415 for (i = 0; i < q->nr; i++) {
6416 struct diff_filepair *p = q->queue[i];
6417 if (check_pair_status(p))
6418 flush_one_pair(p, options);
6419 }
6420 separator++;
6421 }
6422
6423 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
6424 dirstat_by_line = 1;
6425
6426 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6427 dirstat_by_line) {
6428 struct diffstat_t diffstat;
6429
6430 compute_diffstat(options, &diffstat, q);
6431 if (output_format & DIFF_FORMAT_NUMSTAT)
6432 show_numstat(&diffstat, options);
6433 if (output_format & DIFF_FORMAT_DIFFSTAT)
6434 show_stats(&diffstat, options);
6435 if (output_format & DIFF_FORMAT_SHORTSTAT)
6436 show_shortstats(&diffstat, options);
6437 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
6438 show_dirstat_by_line(&diffstat, options);
6439 free_diffstat_info(&diffstat);
6440 separator++;
6441 }
6442 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
6443 show_dirstat(options);
6444
6445 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
6446 for (i = 0; i < q->nr; i++) {
6447 diff_summary(options, q->queue[i]);
6448 }
6449 separator++;
6450 }
6451
6452 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
6453 options->flags.exit_with_status &&
6454 options->flags.diff_from_contents) {
6455 /*
6456 * run diff_flush_patch for the exit status. setting
6457 * options->file to /dev/null should be safe, because we
6458 * aren't supposed to produce any output anyway.
6459 */
6460 diff_free_file(options);
6461 options->file = xfopen("/dev/null", "w");
6462 options->close_file = 1;
6463 options->color_moved = 0;
6464 for (i = 0; i < q->nr; i++) {
6465 struct diff_filepair *p = q->queue[i];
6466 if (check_pair_status(p))
6467 diff_flush_patch(p, options);
6468 if (options->found_changes)
6469 break;
6470 }
6471 }
6472
6473 if (output_format & DIFF_FORMAT_PATCH) {
6474 if (separator) {
6475 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
6476 if (options->stat_sep)
6477 /* attach patch instead of inline */
6478 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6479 NULL, 0, 0);
6480 }
6481
6482 diff_flush_patch_all_file_pairs(options);
6483 }
6484
6485 if (output_format & DIFF_FORMAT_CALLBACK)
6486 options->format_callback(q, options, options->format_callback_data);
6487
6488 for (i = 0; i < q->nr; i++)
6489 diff_free_filepair(q->queue[i]);
6490 free_queue:
6491 free(q->queue);
6492 DIFF_QUEUE_CLEAR(q);
6493 diff_free(options);
6494
6495 /*
6496 * Report the content-level differences with HAS_CHANGES;
6497 * diff_addremove/diff_change does not set the bit when
6498 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6499 */
6500 if (options->flags.diff_from_contents) {
6501 if (options->found_changes)
6502 options->flags.has_changes = 1;
6503 else
6504 options->flags.has_changes = 0;
6505 }
6506 }
6507
6508 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6509 {
6510 return (((p->status == DIFF_STATUS_MODIFIED) &&
6511 ((p->score &&
6512 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6513 (!p->score &&
6514 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6515 ((p->status != DIFF_STATUS_MODIFIED) &&
6516 filter_bit_tst(p->status, options)));
6517 }
6518
6519 static void diffcore_apply_filter(struct diff_options *options)
6520 {
6521 int i;
6522 struct diff_queue_struct *q = &diff_queued_diff;
6523 struct diff_queue_struct outq;
6524
6525 DIFF_QUEUE_CLEAR(&outq);
6526
6527 if (!options->filter)
6528 return;
6529
6530 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6531 int found;
6532 for (i = found = 0; !found && i < q->nr; i++) {
6533 if (match_filter(options, q->queue[i]))
6534 found++;
6535 }
6536 if (found)
6537 return;
6538
6539 /* otherwise we will clear the whole queue
6540 * by copying the empty outq at the end of this
6541 * function, but first clear the current entries
6542 * in the queue.
6543 */
6544 for (i = 0; i < q->nr; i++)
6545 diff_free_filepair(q->queue[i]);
6546 }
6547 else {
6548 /* Only the matching ones */
6549 for (i = 0; i < q->nr; i++) {
6550 struct diff_filepair *p = q->queue[i];
6551 if (match_filter(options, p))
6552 diff_q(&outq, p);
6553 else
6554 diff_free_filepair(p);
6555 }
6556 }
6557 free(q->queue);
6558 *q = outq;
6559 }
6560
6561 /* Check whether two filespecs with the same mode and size are identical */
6562 static int diff_filespec_is_identical(struct repository *r,
6563 struct diff_filespec *one,
6564 struct diff_filespec *two)
6565 {
6566 if (S_ISGITLINK(one->mode))
6567 return 0;
6568 if (diff_populate_filespec(r, one, NULL))
6569 return 0;
6570 if (diff_populate_filespec(r, two, NULL))
6571 return 0;
6572 return !memcmp(one->data, two->data, one->size);
6573 }
6574
6575 static int diff_filespec_check_stat_unmatch(struct repository *r,
6576 struct diff_filepair *p)
6577 {
6578 struct diff_populate_filespec_options dpf_options = {
6579 .check_size_only = 1,
6580 .missing_object_cb = diff_queued_diff_prefetch,
6581 .missing_object_data = r,
6582 };
6583
6584 if (p->done_skip_stat_unmatch)
6585 return p->skip_stat_unmatch_result;
6586
6587 p->done_skip_stat_unmatch = 1;
6588 p->skip_stat_unmatch_result = 0;
6589 /*
6590 * 1. Entries that come from stat info dirtiness
6591 * always have both sides (iow, not create/delete),
6592 * one side of the object name is unknown, with
6593 * the same mode and size. Keep the ones that
6594 * do not match these criteria. They have real
6595 * differences.
6596 *
6597 * 2. At this point, the file is known to be modified,
6598 * with the same mode and size, and the object
6599 * name of one side is unknown. Need to inspect
6600 * the identical contents.
6601 */
6602 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6603 !DIFF_FILE_VALID(p->two) ||
6604 (p->one->oid_valid && p->two->oid_valid) ||
6605 (p->one->mode != p->two->mode) ||
6606 diff_populate_filespec(r, p->one, &dpf_options) ||
6607 diff_populate_filespec(r, p->two, &dpf_options) ||
6608 (p->one->size != p->two->size) ||
6609 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6610 p->skip_stat_unmatch_result = 1;
6611 return p->skip_stat_unmatch_result;
6612 }
6613
6614 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6615 {
6616 int i;
6617 struct diff_queue_struct *q = &diff_queued_diff;
6618 struct diff_queue_struct outq;
6619 DIFF_QUEUE_CLEAR(&outq);
6620
6621 for (i = 0; i < q->nr; i++) {
6622 struct diff_filepair *p = q->queue[i];
6623
6624 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6625 diff_q(&outq, p);
6626 else {
6627 /*
6628 * The caller can subtract 1 from skip_stat_unmatch
6629 * to determine how many paths were dirty only
6630 * due to stat info mismatch.
6631 */
6632 if (!diffopt->flags.no_index)
6633 diffopt->skip_stat_unmatch++;
6634 diff_free_filepair(p);
6635 }
6636 }
6637 free(q->queue);
6638 *q = outq;
6639 }
6640
6641 static int diffnamecmp(const void *a_, const void *b_)
6642 {
6643 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6644 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6645 const char *name_a, *name_b;
6646
6647 name_a = a->one ? a->one->path : a->two->path;
6648 name_b = b->one ? b->one->path : b->two->path;
6649 return strcmp(name_a, name_b);
6650 }
6651
6652 void diffcore_fix_diff_index(void)
6653 {
6654 struct diff_queue_struct *q = &diff_queued_diff;
6655 QSORT(q->queue, q->nr, diffnamecmp);
6656 }
6657
6658 void diff_add_if_missing(struct repository *r,
6659 struct oid_array *to_fetch,
6660 const struct diff_filespec *filespec)
6661 {
6662 if (filespec && filespec->oid_valid &&
6663 !S_ISGITLINK(filespec->mode) &&
6664 oid_object_info_extended(r, &filespec->oid, NULL,
6665 OBJECT_INFO_FOR_PREFETCH))
6666 oid_array_append(to_fetch, &filespec->oid);
6667 }
6668
6669 void diff_queued_diff_prefetch(void *repository)
6670 {
6671 struct repository *repo = repository;
6672 int i;
6673 struct diff_queue_struct *q = &diff_queued_diff;
6674 struct oid_array to_fetch = OID_ARRAY_INIT;
6675
6676 for (i = 0; i < q->nr; i++) {
6677 struct diff_filepair *p = q->queue[i];
6678 diff_add_if_missing(repo, &to_fetch, p->one);
6679 diff_add_if_missing(repo, &to_fetch, p->two);
6680 }
6681
6682 /*
6683 * NEEDSWORK: Consider deduplicating the OIDs sent.
6684 */
6685 promisor_remote_get_direct(repo, to_fetch.oid, to_fetch.nr);
6686
6687 oid_array_clear(&to_fetch);
6688 }
6689
6690 void diffcore_std(struct diff_options *options)
6691 {
6692 int output_formats_to_prefetch = DIFF_FORMAT_DIFFSTAT |
6693 DIFF_FORMAT_NUMSTAT |
6694 DIFF_FORMAT_PATCH |
6695 DIFF_FORMAT_SHORTSTAT |
6696 DIFF_FORMAT_DIRSTAT;
6697
6698 /*
6699 * Check if the user requested a blob-data-requiring diff output and/or
6700 * break-rewrite detection (which requires blob data). If yes, prefetch
6701 * the diff pairs.
6702 *
6703 * If no prefetching occurs, diffcore_rename() will prefetch if it
6704 * decides that it needs inexact rename detection.
6705 */
6706 if (options->repo == the_repository && has_promisor_remote() &&
6707 (options->output_format & output_formats_to_prefetch ||
6708 options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
6709 diff_queued_diff_prefetch(options->repo);
6710
6711 /* NOTE please keep the following in sync with diff_tree_combined() */
6712 if (options->skip_stat_unmatch)
6713 diffcore_skip_stat_unmatch(options);
6714 if (!options->found_follow) {
6715 /* See try_to_follow_renames() in tree-diff.c */
6716 if (options->break_opt != -1)
6717 diffcore_break(options->repo,
6718 options->break_opt);
6719 if (options->detect_rename)
6720 diffcore_rename(options);
6721 if (options->break_opt != -1)
6722 diffcore_merge_broken();
6723 }
6724 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6725 diffcore_pickaxe(options);
6726 if (options->orderfile)
6727 diffcore_order(options->orderfile);
6728 if (options->rotate_to)
6729 diffcore_rotate(options);
6730 if (!options->found_follow)
6731 /* See try_to_follow_renames() in tree-diff.c */
6732 diff_resolve_rename_copy();
6733 diffcore_apply_filter(options);
6734
6735 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6736 options->flags.has_changes = 1;
6737 else
6738 options->flags.has_changes = 0;
6739
6740 options->found_follow = 0;
6741 }
6742
6743 int diff_result_code(struct diff_options *opt, int status)
6744 {
6745 int result = 0;
6746
6747 diff_warn_rename_limit("diff.renameLimit",
6748 opt->needed_rename_limit,
6749 opt->degraded_cc_to_c);
6750 if (!opt->flags.exit_with_status &&
6751 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6752 return status;
6753 if (opt->flags.exit_with_status &&
6754 opt->flags.has_changes)
6755 result |= 01;
6756 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6757 opt->flags.check_failed)
6758 result |= 02;
6759 return result;
6760 }
6761
6762 int diff_can_quit_early(struct diff_options *opt)
6763 {
6764 return (opt->flags.quick &&
6765 !opt->filter &&
6766 opt->flags.has_changes);
6767 }
6768
6769 /*
6770 * Shall changes to this submodule be ignored?
6771 *
6772 * Submodule changes can be configured to be ignored separately for each path,
6773 * but that configuration can be overridden from the command line.
6774 */
6775 static int is_submodule_ignored(const char *path, struct diff_options *options)
6776 {
6777 int ignored = 0;
6778 struct diff_flags orig_flags = options->flags;
6779 if (!options->flags.override_submodule_config)
6780 set_diffopt_flags_from_submodule_config(options, path);
6781 if (options->flags.ignore_submodules)
6782 ignored = 1;
6783 options->flags = orig_flags;
6784 return ignored;
6785 }
6786
6787 void compute_diffstat(struct diff_options *options,
6788 struct diffstat_t *diffstat,
6789 struct diff_queue_struct *q)
6790 {
6791 int i;
6792
6793 memset(diffstat, 0, sizeof(struct diffstat_t));
6794 for (i = 0; i < q->nr; i++) {
6795 struct diff_filepair *p = q->queue[i];
6796 if (check_pair_status(p))
6797 diff_flush_stat(p, options, diffstat);
6798 }
6799 }
6800
6801 void diff_addremove(struct diff_options *options,
6802 int addremove, unsigned mode,
6803 const struct object_id *oid,
6804 int oid_valid,
6805 const char *concatpath, unsigned dirty_submodule)
6806 {
6807 struct diff_filespec *one, *two;
6808
6809 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6810 return;
6811
6812 /* This may look odd, but it is a preparation for
6813 * feeding "there are unchanged files which should
6814 * not produce diffs, but when you are doing copy
6815 * detection you would need them, so here they are"
6816 * entries to the diff-core. They will be prefixed
6817 * with something like '=' or '*' (I haven't decided
6818 * which but should not make any difference).
6819 * Feeding the same new and old to diff_change()
6820 * also has the same effect.
6821 * Before the final output happens, they are pruned after
6822 * merged into rename/copy pairs as appropriate.
6823 */
6824 if (options->flags.reverse_diff)
6825 addremove = (addremove == '+' ? '-' :
6826 addremove == '-' ? '+' : addremove);
6827
6828 if (options->prefix &&
6829 strncmp(concatpath, options->prefix, options->prefix_length))
6830 return;
6831
6832 one = alloc_filespec(concatpath);
6833 two = alloc_filespec(concatpath);
6834
6835 if (addremove != '+')
6836 fill_filespec(one, oid, oid_valid, mode);
6837 if (addremove != '-') {
6838 fill_filespec(two, oid, oid_valid, mode);
6839 two->dirty_submodule = dirty_submodule;
6840 }
6841
6842 diff_queue(&diff_queued_diff, one, two);
6843 if (!options->flags.diff_from_contents)
6844 options->flags.has_changes = 1;
6845 }
6846
6847 void diff_change(struct diff_options *options,
6848 unsigned old_mode, unsigned new_mode,
6849 const struct object_id *old_oid,
6850 const struct object_id *new_oid,
6851 int old_oid_valid, int new_oid_valid,
6852 const char *concatpath,
6853 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6854 {
6855 struct diff_filespec *one, *two;
6856 struct diff_filepair *p;
6857
6858 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6859 is_submodule_ignored(concatpath, options))
6860 return;
6861
6862 if (options->flags.reverse_diff) {
6863 SWAP(old_mode, new_mode);
6864 SWAP(old_oid, new_oid);
6865 SWAP(old_oid_valid, new_oid_valid);
6866 SWAP(old_dirty_submodule, new_dirty_submodule);
6867 }
6868
6869 if (options->prefix &&
6870 strncmp(concatpath, options->prefix, options->prefix_length))
6871 return;
6872
6873 one = alloc_filespec(concatpath);
6874 two = alloc_filespec(concatpath);
6875 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6876 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6877 one->dirty_submodule = old_dirty_submodule;
6878 two->dirty_submodule = new_dirty_submodule;
6879 p = diff_queue(&diff_queued_diff, one, two);
6880
6881 if (options->flags.diff_from_contents)
6882 return;
6883
6884 if (options->flags.quick && options->skip_stat_unmatch &&
6885 !diff_filespec_check_stat_unmatch(options->repo, p)) {
6886 diff_free_filespec_data(p->one);
6887 diff_free_filespec_data(p->two);
6888 return;
6889 }
6890
6891 options->flags.has_changes = 1;
6892 }
6893
6894 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6895 {
6896 struct diff_filepair *pair;
6897 struct diff_filespec *one, *two;
6898
6899 if (options->prefix &&
6900 strncmp(path, options->prefix, options->prefix_length))
6901 return NULL;
6902
6903 one = alloc_filespec(path);
6904 two = alloc_filespec(path);
6905 pair = diff_queue(&diff_queued_diff, one, two);
6906 pair->is_unmerged = 1;
6907 return pair;
6908 }
6909
6910 static char *run_textconv(struct repository *r,
6911 const char *pgm,
6912 struct diff_filespec *spec,
6913 size_t *outsize)
6914 {
6915 struct diff_tempfile *temp;
6916 const char *argv[3];
6917 const char **arg = argv;
6918 struct child_process child = CHILD_PROCESS_INIT;
6919 struct strbuf buf = STRBUF_INIT;
6920 int err = 0;
6921
6922 temp = prepare_temp_file(r, spec->path, spec);
6923 *arg++ = pgm;
6924 *arg++ = temp->name;
6925 *arg = NULL;
6926
6927 child.use_shell = 1;
6928 child.argv = argv;
6929 child.out = -1;
6930 if (start_command(&child)) {
6931 remove_tempfile();
6932 return NULL;
6933 }
6934
6935 if (strbuf_read(&buf, child.out, 0) < 0)
6936 err = error("error reading from textconv command '%s'", pgm);
6937 close(child.out);
6938
6939 if (finish_command(&child) || err) {
6940 strbuf_release(&buf);
6941 remove_tempfile();
6942 return NULL;
6943 }
6944 remove_tempfile();
6945
6946 return strbuf_detach(&buf, outsize);
6947 }
6948
6949 size_t fill_textconv(struct repository *r,
6950 struct userdiff_driver *driver,
6951 struct diff_filespec *df,
6952 char **outbuf)
6953 {
6954 size_t size;
6955
6956 if (!driver) {
6957 if (!DIFF_FILE_VALID(df)) {
6958 *outbuf = "";
6959 return 0;
6960 }
6961 if (diff_populate_filespec(r, df, NULL))
6962 die("unable to read files to diff");
6963 *outbuf = df->data;
6964 return df->size;
6965 }
6966
6967 if (!driver->textconv)
6968 BUG("fill_textconv called with non-textconv driver");
6969
6970 if (driver->textconv_cache && df->oid_valid) {
6971 *outbuf = notes_cache_get(driver->textconv_cache,
6972 &df->oid,
6973 &size);
6974 if (*outbuf)
6975 return size;
6976 }
6977
6978 *outbuf = run_textconv(r, driver->textconv, df, &size);
6979 if (!*outbuf)
6980 die("unable to read files to diff");
6981
6982 if (driver->textconv_cache && df->oid_valid) {
6983 /* ignore errors, as we might be in a readonly repository */
6984 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6985 size);
6986 /*
6987 * we could save up changes and flush them all at the end,
6988 * but we would need an extra call after all diffing is done.
6989 * Since generating a cache entry is the slow path anyway,
6990 * this extra overhead probably isn't a big deal.
6991 */
6992 notes_cache_write(driver->textconv_cache);
6993 }
6994
6995 return size;
6996 }
6997
6998 int textconv_object(struct repository *r,
6999 const char *path,
7000 unsigned mode,
7001 const struct object_id *oid,
7002 int oid_valid,
7003 char **buf,
7004 unsigned long *buf_size)
7005 {
7006 struct diff_filespec *df;
7007 struct userdiff_driver *textconv;
7008
7009 df = alloc_filespec(path);
7010 fill_filespec(df, oid, oid_valid, mode);
7011 textconv = get_textconv(r, df);
7012 if (!textconv) {
7013 free_filespec(df);
7014 return 0;
7015 }
7016
7017 *buf_size = fill_textconv(r, textconv, df, buf);
7018 free_filespec(df);
7019 return 1;
7020 }
7021
7022 void setup_diff_pager(struct diff_options *opt)
7023 {
7024 /*
7025 * If the user asked for our exit code, then either they want --quiet
7026 * or --exit-code. We should definitely not bother with a pager in the
7027 * former case, as we will generate no output. Since we still properly
7028 * report our exit code even when a pager is run, we _could_ run a
7029 * pager with --exit-code. But since we have not done so historically,
7030 * and because it is easy to find people oneline advising "git diff
7031 * --exit-code" in hooks and other scripts, we do not do so.
7032 */
7033 if (!opt->flags.exit_with_status &&
7034 check_pager_config("diff") != 0)
7035 setup_pager();
7036 }
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