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attr: fix out-of-bounds write when parsing huge number of attributes
[git/debian.git] / diff.c
blob2253ec880298b4f146cb20f6dbae365d77b8fdfe
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 if (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 return *begin >= *end;
2065 }
2066 return -1;
2067 }
2068
2069 /* find the next word */
2070 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2071 (*begin)++;
2072 if (*begin >= buffer->size)
2073 return -1;
2074
2075 /* find the end of the word */
2076 *end = *begin + 1;
2077 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2078 (*end)++;
2079
2080 return 0;
2081 }
2082
2083 /*
2084 * This function splits the words in buffer->text, stores the list with
2085 * newline separator into out, and saves the offsets of the original words
2086 * in buffer->orig.
2087 */
2088 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2089 regex_t *word_regex)
2090 {
2091 int i, j;
2092 long alloc = 0;
2093
2094 out->size = 0;
2095 out->ptr = NULL;
2096
2097 /* fake an empty "0th" word */
2098 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2099 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2100 buffer->orig_nr = 1;
2101
2102 for (i = 0; i < buffer->text.size; i++) {
2103 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2104 return;
2105
2106 /* store original boundaries */
2107 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2108 buffer->orig_alloc);
2109 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2110 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2111 buffer->orig_nr++;
2112
2113 /* store one word */
2114 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2115 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2116 out->ptr[out->size + j - i] = '\n';
2117 out->size += j - i + 1;
2118
2119 i = j - 1;
2120 }
2121 }
2122
2123 /* this executes the word diff on the accumulated buffers */
2124 static void diff_words_show(struct diff_words_data *diff_words)
2125 {
2126 xpparam_t xpp;
2127 xdemitconf_t xecfg;
2128 mmfile_t minus, plus;
2129 struct diff_words_style *style = diff_words->style;
2130
2131 struct diff_options *opt = diff_words->opt;
2132 const char *line_prefix;
2133
2134 assert(opt);
2135 line_prefix = diff_line_prefix(opt);
2136
2137 /* special case: only removal */
2138 if (!diff_words->plus.text.size) {
2139 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2140 line_prefix, strlen(line_prefix), 0);
2141 fn_out_diff_words_write_helper(diff_words->opt,
2142 &style->old_word, style->newline,
2143 diff_words->minus.text.size,
2144 diff_words->minus.text.ptr);
2145 diff_words->minus.text.size = 0;
2146 return;
2147 }
2148
2149 diff_words->current_plus = diff_words->plus.text.ptr;
2150 diff_words->last_minus = 0;
2151
2152 memset(&xpp, 0, sizeof(xpp));
2153 memset(&xecfg, 0, sizeof(xecfg));
2154 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2155 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2156 xpp.flags = 0;
2157 /* as only the hunk header will be parsed, we need a 0-context */
2158 xecfg.ctxlen = 0;
2159 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2160 diff_words, &xpp, &xecfg))
2161 die("unable to generate word diff");
2162 free(minus.ptr);
2163 free(plus.ptr);
2164 if (diff_words->current_plus != diff_words->plus.text.ptr +
2165 diff_words->plus.text.size) {
2166 if (color_words_output_graph_prefix(diff_words))
2167 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2168 line_prefix, strlen(line_prefix), 0);
2169 fn_out_diff_words_write_helper(diff_words->opt,
2170 &style->ctx, style->newline,
2171 diff_words->plus.text.ptr + diff_words->plus.text.size
2172 - diff_words->current_plus, diff_words->current_plus);
2173 }
2174 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2175 }
2176
2177 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2178 static void diff_words_flush(struct emit_callback *ecbdata)
2179 {
2180 struct diff_options *wo = ecbdata->diff_words->opt;
2181
2182 if (ecbdata->diff_words->minus.text.size ||
2183 ecbdata->diff_words->plus.text.size)
2184 diff_words_show(ecbdata->diff_words);
2185
2186 if (wo->emitted_symbols) {
2187 struct diff_options *o = ecbdata->opt;
2188 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2189 int i;
2190
2191 /*
2192 * NEEDSWORK:
2193 * Instead of appending each, concat all words to a line?
2194 */
2195 for (i = 0; i < wol->nr; i++)
2196 append_emitted_diff_symbol(o, &wol->buf[i]);
2197
2198 for (i = 0; i < wol->nr; i++)
2199 free((void *)wol->buf[i].line);
2200
2201 wol->nr = 0;
2202 }
2203 }
2204
2205 static void diff_filespec_load_driver(struct diff_filespec *one,
2206 struct index_state *istate)
2207 {
2208 /* Use already-loaded driver */
2209 if (one->driver)
2210 return;
2211
2212 if (S_ISREG(one->mode))
2213 one->driver = userdiff_find_by_path(istate, one->path);
2214
2215 /* Fallback to default settings */
2216 if (!one->driver)
2217 one->driver = userdiff_find_by_name("default");
2218 }
2219
2220 static const char *userdiff_word_regex(struct diff_filespec *one,
2221 struct index_state *istate)
2222 {
2223 diff_filespec_load_driver(one, istate);
2224 return one->driver->word_regex;
2225 }
2226
2227 static void init_diff_words_data(struct emit_callback *ecbdata,
2228 struct diff_options *orig_opts,
2229 struct diff_filespec *one,
2230 struct diff_filespec *two)
2231 {
2232 int i;
2233 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2234 memcpy(o, orig_opts, sizeof(struct diff_options));
2235
2236 ecbdata->diff_words =
2237 xcalloc(1, sizeof(struct diff_words_data));
2238 ecbdata->diff_words->type = o->word_diff;
2239 ecbdata->diff_words->opt = o;
2240
2241 if (orig_opts->emitted_symbols)
2242 o->emitted_symbols =
2243 xcalloc(1, sizeof(struct emitted_diff_symbols));
2244
2245 if (!o->word_regex)
2246 o->word_regex = userdiff_word_regex(one, o->repo->index);
2247 if (!o->word_regex)
2248 o->word_regex = userdiff_word_regex(two, o->repo->index);
2249 if (!o->word_regex)
2250 o->word_regex = diff_word_regex_cfg;
2251 if (o->word_regex) {
2252 ecbdata->diff_words->word_regex = (regex_t *)
2253 xmalloc(sizeof(regex_t));
2254 if (regcomp(ecbdata->diff_words->word_regex,
2255 o->word_regex,
2256 REG_EXTENDED | REG_NEWLINE))
2257 die("invalid regular expression: %s",
2258 o->word_regex);
2259 }
2260 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2261 if (o->word_diff == diff_words_styles[i].type) {
2262 ecbdata->diff_words->style =
2263 &diff_words_styles[i];
2264 break;
2265 }
2266 }
2267 if (want_color(o->use_color)) {
2268 struct diff_words_style *st = ecbdata->diff_words->style;
2269 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2270 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2271 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2272 }
2273 }
2274
2275 static void free_diff_words_data(struct emit_callback *ecbdata)
2276 {
2277 if (ecbdata->diff_words) {
2278 diff_words_flush(ecbdata);
2279 free (ecbdata->diff_words->opt->emitted_symbols);
2280 free (ecbdata->diff_words->opt);
2281 free (ecbdata->diff_words->minus.text.ptr);
2282 free (ecbdata->diff_words->minus.orig);
2283 free (ecbdata->diff_words->plus.text.ptr);
2284 free (ecbdata->diff_words->plus.orig);
2285 if (ecbdata->diff_words->word_regex) {
2286 regfree(ecbdata->diff_words->word_regex);
2287 free(ecbdata->diff_words->word_regex);
2288 }
2289 FREE_AND_NULL(ecbdata->diff_words);
2290 }
2291 }
2292
2293 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2294 {
2295 if (want_color(diff_use_color))
2296 return diff_colors[ix];
2297 return "";
2298 }
2299
2300 const char *diff_line_prefix(struct diff_options *opt)
2301 {
2302 struct strbuf *msgbuf;
2303 if (!opt->output_prefix)
2304 return "";
2305
2306 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2307 return msgbuf->buf;
2308 }
2309
2310 static unsigned long sane_truncate_line(char *line, unsigned long len)
2311 {
2312 const char *cp;
2313 unsigned long allot;
2314 size_t l = len;
2315
2316 cp = line;
2317 allot = l;
2318 while (0 < l) {
2319 (void) utf8_width(&cp, &l);
2320 if (!cp)
2321 break; /* truncated in the middle? */
2322 }
2323 return allot - l;
2324 }
2325
2326 static void find_lno(const char *line, struct emit_callback *ecbdata)
2327 {
2328 const char *p;
2329 ecbdata->lno_in_preimage = 0;
2330 ecbdata->lno_in_postimage = 0;
2331 p = strchr(line, '-');
2332 if (!p)
2333 return; /* cannot happen */
2334 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2335 p = strchr(p, '+');
2336 if (!p)
2337 return; /* cannot happen */
2338 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2339 }
2340
2341 static void fn_out_consume(void *priv, char *line, unsigned long len)
2342 {
2343 struct emit_callback *ecbdata = priv;
2344 struct diff_options *o = ecbdata->opt;
2345
2346 o->found_changes = 1;
2347
2348 if (ecbdata->header) {
2349 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2350 ecbdata->header->buf, ecbdata->header->len, 0);
2351 strbuf_reset(ecbdata->header);
2352 ecbdata->header = NULL;
2353 }
2354
2355 if (ecbdata->label_path[0]) {
2356 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2357 ecbdata->label_path[0],
2358 strlen(ecbdata->label_path[0]), 0);
2359 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2360 ecbdata->label_path[1],
2361 strlen(ecbdata->label_path[1]), 0);
2362 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2363 }
2364
2365 if (diff_suppress_blank_empty
2366 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2367 line[0] = '\n';
2368 len = 1;
2369 }
2370
2371 if (line[0] == '@') {
2372 if (ecbdata->diff_words)
2373 diff_words_flush(ecbdata);
2374 len = sane_truncate_line(line, len);
2375 find_lno(line, ecbdata);
2376 emit_hunk_header(ecbdata, line, len);
2377 return;
2378 }
2379
2380 if (ecbdata->diff_words) {
2381 enum diff_symbol s =
2382 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2383 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2384 if (line[0] == '-') {
2385 diff_words_append(line, len,
2386 &ecbdata->diff_words->minus);
2387 return;
2388 } else if (line[0] == '+') {
2389 diff_words_append(line, len,
2390 &ecbdata->diff_words->plus);
2391 return;
2392 } else if (starts_with(line, "\\ ")) {
2393 /*
2394 * Eat the "no newline at eof" marker as if we
2395 * saw a "+" or "-" line with nothing on it,
2396 * and return without diff_words_flush() to
2397 * defer processing. If this is the end of
2398 * preimage, more "+" lines may come after it.
2399 */
2400 return;
2401 }
2402 diff_words_flush(ecbdata);
2403 emit_diff_symbol(o, s, line, len, 0);
2404 return;
2405 }
2406
2407 switch (line[0]) {
2408 case '+':
2409 ecbdata->lno_in_postimage++;
2410 emit_add_line(ecbdata, line + 1, len - 1);
2411 break;
2412 case '-':
2413 ecbdata->lno_in_preimage++;
2414 emit_del_line(ecbdata, line + 1, len - 1);
2415 break;
2416 case ' ':
2417 ecbdata->lno_in_postimage++;
2418 ecbdata->lno_in_preimage++;
2419 emit_context_line(ecbdata, line + 1, len - 1);
2420 break;
2421 default:
2422 /* incomplete line at the end */
2423 ecbdata->lno_in_preimage++;
2424 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2425 line, len, 0);
2426 break;
2427 }
2428 }
2429
2430 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2431 {
2432 const char *old_name = a;
2433 const char *new_name = b;
2434 int pfx_length, sfx_length;
2435 int pfx_adjust_for_slash;
2436 int len_a = strlen(a);
2437 int len_b = strlen(b);
2438 int a_midlen, b_midlen;
2439 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2440 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2441
2442 if (qlen_a || qlen_b) {
2443 quote_c_style(a, name, NULL, 0);
2444 strbuf_addstr(name, " => ");
2445 quote_c_style(b, name, NULL, 0);
2446 return;
2447 }
2448
2449 /* Find common prefix */
2450 pfx_length = 0;
2451 while (*old_name && *new_name && *old_name == *new_name) {
2452 if (*old_name == '/')
2453 pfx_length = old_name - a + 1;
2454 old_name++;
2455 new_name++;
2456 }
2457
2458 /* Find common suffix */
2459 old_name = a + len_a;
2460 new_name = b + len_b;
2461 sfx_length = 0;
2462 /*
2463 * If there is a common prefix, it must end in a slash. In
2464 * that case we let this loop run 1 into the prefix to see the
2465 * same slash.
2466 *
2467 * If there is no common prefix, we cannot do this as it would
2468 * underrun the input strings.
2469 */
2470 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2471 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2472 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2473 *old_name == *new_name) {
2474 if (*old_name == '/')
2475 sfx_length = len_a - (old_name - a);
2476 old_name--;
2477 new_name--;
2478 }
2479
2480 /*
2481 * pfx{mid-a => mid-b}sfx
2482 * {pfx-a => pfx-b}sfx
2483 * pfx{sfx-a => sfx-b}
2484 * name-a => name-b
2485 */
2486 a_midlen = len_a - pfx_length - sfx_length;
2487 b_midlen = len_b - pfx_length - sfx_length;
2488 if (a_midlen < 0)
2489 a_midlen = 0;
2490 if (b_midlen < 0)
2491 b_midlen = 0;
2492
2493 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2494 if (pfx_length + sfx_length) {
2495 strbuf_add(name, a, pfx_length);
2496 strbuf_addch(name, '{');
2497 }
2498 strbuf_add(name, a + pfx_length, a_midlen);
2499 strbuf_addstr(name, " => ");
2500 strbuf_add(name, b + pfx_length, b_midlen);
2501 if (pfx_length + sfx_length) {
2502 strbuf_addch(name, '}');
2503 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2504 }
2505 }
2506
2507 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2508 const char *name_a,
2509 const char *name_b)
2510 {
2511 struct diffstat_file *x;
2512 x = xcalloc(1, sizeof(*x));
2513 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2514 diffstat->files[diffstat->nr++] = x;
2515 if (name_b) {
2516 x->from_name = xstrdup(name_a);
2517 x->name = xstrdup(name_b);
2518 x->is_renamed = 1;
2519 }
2520 else {
2521 x->from_name = NULL;
2522 x->name = xstrdup(name_a);
2523 }
2524 return x;
2525 }
2526
2527 static void diffstat_consume(void *priv, char *line, unsigned long len)
2528 {
2529 struct diffstat_t *diffstat = priv;
2530 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2531
2532 if (line[0] == '+')
2533 x->added++;
2534 else if (line[0] == '-')
2535 x->deleted++;
2536 }
2537
2538 const char mime_boundary_leader[] = "------------";
2539
2540 static int scale_linear(int it, int width, int max_change)
2541 {
2542 if (!it)
2543 return 0;
2544 /*
2545 * make sure that at least one '-' or '+' is printed if
2546 * there is any change to this path. The easiest way is to
2547 * scale linearly as if the allotted width is one column shorter
2548 * than it is, and then add 1 to the result.
2549 */
2550 return 1 + (it * (width - 1) / max_change);
2551 }
2552
2553 static void show_graph(struct strbuf *out, char ch, int cnt,
2554 const char *set, const char *reset)
2555 {
2556 if (cnt <= 0)
2557 return;
2558 strbuf_addstr(out, set);
2559 strbuf_addchars(out, ch, cnt);
2560 strbuf_addstr(out, reset);
2561 }
2562
2563 static void fill_print_name(struct diffstat_file *file)
2564 {
2565 struct strbuf pname = STRBUF_INIT;
2566
2567 if (file->print_name)
2568 return;
2569
2570 if (file->is_renamed)
2571 pprint_rename(&pname, file->from_name, file->name);
2572 else
2573 quote_c_style(file->name, &pname, NULL, 0);
2574
2575 if (file->comments)
2576 strbuf_addf(&pname, " (%s)", file->comments);
2577
2578 file->print_name = strbuf_detach(&pname, NULL);
2579 }
2580
2581 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2582 int files, int insertions, int deletions)
2583 {
2584 struct strbuf sb = STRBUF_INIT;
2585
2586 if (!files) {
2587 assert(insertions == 0 && deletions == 0);
2588 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2589 NULL, 0, 0);
2590 return;
2591 }
2592
2593 strbuf_addf(&sb,
2594 (files == 1) ? " %d file changed" : " %d files changed",
2595 files);
2596
2597 /*
2598 * For binary diff, the caller may want to print "x files
2599 * changed" with insertions == 0 && deletions == 0.
2600 *
2601 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2602 * is probably less confusing (i.e skip over "2 files changed
2603 * but nothing about added/removed lines? Is this a bug in Git?").
2604 */
2605 if (insertions || deletions == 0) {
2606 strbuf_addf(&sb,
2607 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2608 insertions);
2609 }
2610
2611 if (deletions || insertions == 0) {
2612 strbuf_addf(&sb,
2613 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2614 deletions);
2615 }
2616 strbuf_addch(&sb, '\n');
2617 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2618 sb.buf, sb.len, 0);
2619 strbuf_release(&sb);
2620 }
2621
2622 void print_stat_summary(FILE *fp, int files,
2623 int insertions, int deletions)
2624 {
2625 struct diff_options o;
2626 memset(&o, 0, sizeof(o));
2627 o.file = fp;
2628
2629 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2630 }
2631
2632 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2633 {
2634 int i, len, add, del, adds = 0, dels = 0;
2635 uintmax_t max_change = 0, max_len = 0;
2636 int total_files = data->nr, count;
2637 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2638 const char *reset, *add_c, *del_c;
2639 int extra_shown = 0;
2640 const char *line_prefix = diff_line_prefix(options);
2641 struct strbuf out = STRBUF_INIT;
2642
2643 if (data->nr == 0)
2644 return;
2645
2646 count = options->stat_count ? options->stat_count : data->nr;
2647
2648 reset = diff_get_color_opt(options, DIFF_RESET);
2649 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2650 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2651
2652 /*
2653 * Find the longest filename and max number of changes
2654 */
2655 for (i = 0; (i < count) && (i < data->nr); i++) {
2656 struct diffstat_file *file = data->files[i];
2657 uintmax_t change = file->added + file->deleted;
2658
2659 if (!file->is_interesting && (change == 0)) {
2660 count++; /* not shown == room for one more */
2661 continue;
2662 }
2663 fill_print_name(file);
2664 len = strlen(file->print_name);
2665 if (max_len < len)
2666 max_len = len;
2667
2668 if (file->is_unmerged) {
2669 /* "Unmerged" is 8 characters */
2670 bin_width = bin_width < 8 ? 8 : bin_width;
2671 continue;
2672 }
2673 if (file->is_binary) {
2674 /* "Bin XXX -> YYY bytes" */
2675 int w = 14 + decimal_width(file->added)
2676 + decimal_width(file->deleted);
2677 bin_width = bin_width < w ? w : bin_width;
2678 /* Display change counts aligned with "Bin" */
2679 number_width = 3;
2680 continue;
2681 }
2682
2683 if (max_change < change)
2684 max_change = change;
2685 }
2686 count = i; /* where we can stop scanning in data->files[] */
2687
2688 /*
2689 * We have width = stat_width or term_columns() columns total.
2690 * We want a maximum of min(max_len, stat_name_width) for the name part.
2691 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2692 * We also need 1 for " " and 4 + decimal_width(max_change)
2693 * for " | NNNN " and one the empty column at the end, altogether
2694 * 6 + decimal_width(max_change).
2695 *
2696 * If there's not enough space, we will use the smaller of
2697 * stat_name_width (if set) and 5/8*width for the filename,
2698 * and the rest for constant elements + graph part, but no more
2699 * than stat_graph_width for the graph part.
2700 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2701 * for the standard terminal size).
2702 *
2703 * In other words: stat_width limits the maximum width, and
2704 * stat_name_width fixes the maximum width of the filename,
2705 * and is also used to divide available columns if there
2706 * aren't enough.
2707 *
2708 * Binary files are displayed with "Bin XXX -> YYY bytes"
2709 * instead of the change count and graph. This part is treated
2710 * similarly to the graph part, except that it is not
2711 * "scaled". If total width is too small to accommodate the
2712 * guaranteed minimum width of the filename part and the
2713 * separators and this message, this message will "overflow"
2714 * making the line longer than the maximum width.
2715 */
2716
2717 if (options->stat_width == -1)
2718 width = term_columns() - strlen(line_prefix);
2719 else
2720 width = options->stat_width ? options->stat_width : 80;
2721 number_width = decimal_width(max_change) > number_width ?
2722 decimal_width(max_change) : number_width;
2723
2724 if (options->stat_graph_width == -1)
2725 options->stat_graph_width = diff_stat_graph_width;
2726
2727 /*
2728 * Guarantee 3/8*16==6 for the graph part
2729 * and 5/8*16==10 for the filename part
2730 */
2731 if (width < 16 + 6 + number_width)
2732 width = 16 + 6 + number_width;
2733
2734 /*
2735 * First assign sizes that are wanted, ignoring available width.
2736 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2737 * starting from "XXX" should fit in graph_width.
2738 */
2739 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2740 if (options->stat_graph_width &&
2741 options->stat_graph_width < graph_width)
2742 graph_width = options->stat_graph_width;
2743
2744 name_width = (options->stat_name_width > 0 &&
2745 options->stat_name_width < max_len) ?
2746 options->stat_name_width : max_len;
2747
2748 /*
2749 * Adjust adjustable widths not to exceed maximum width
2750 */
2751 if (name_width + number_width + 6 + graph_width > width) {
2752 if (graph_width > width * 3/8 - number_width - 6) {
2753 graph_width = width * 3/8 - number_width - 6;
2754 if (graph_width < 6)
2755 graph_width = 6;
2756 }
2757
2758 if (options->stat_graph_width &&
2759 graph_width > options->stat_graph_width)
2760 graph_width = options->stat_graph_width;
2761 if (name_width > width - number_width - 6 - graph_width)
2762 name_width = width - number_width - 6 - graph_width;
2763 else
2764 graph_width = width - number_width - 6 - name_width;
2765 }
2766
2767 /*
2768 * From here name_width is the width of the name area,
2769 * and graph_width is the width of the graph area.
2770 * max_change is used to scale graph properly.
2771 */
2772 for (i = 0; i < count; i++) {
2773 const char *prefix = "";
2774 struct diffstat_file *file = data->files[i];
2775 char *name = file->print_name;
2776 uintmax_t added = file->added;
2777 uintmax_t deleted = file->deleted;
2778 int name_len;
2779
2780 if (!file->is_interesting && (added + deleted == 0))
2781 continue;
2782
2783 /*
2784 * "scale" the filename
2785 */
2786 len = name_width;
2787 name_len = strlen(name);
2788 if (name_width < name_len) {
2789 char *slash;
2790 prefix = "...";
2791 len -= 3;
2792 name += name_len - len;
2793 slash = strchr(name, '/');
2794 if (slash)
2795 name = slash;
2796 }
2797
2798 if (file->is_binary) {
2799 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2800 strbuf_addf(&out, " %*s", number_width, "Bin");
2801 if (!added && !deleted) {
2802 strbuf_addch(&out, '\n');
2803 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2804 out.buf, out.len, 0);
2805 strbuf_reset(&out);
2806 continue;
2807 }
2808 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2809 del_c, deleted, reset);
2810 strbuf_addstr(&out, " -> ");
2811 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2812 add_c, added, reset);
2813 strbuf_addstr(&out, " bytes\n");
2814 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2815 out.buf, out.len, 0);
2816 strbuf_reset(&out);
2817 continue;
2818 }
2819 else if (file->is_unmerged) {
2820 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2821 strbuf_addstr(&out, " Unmerged\n");
2822 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2823 out.buf, out.len, 0);
2824 strbuf_reset(&out);
2825 continue;
2826 }
2827
2828 /*
2829 * scale the add/delete
2830 */
2831 add = added;
2832 del = deleted;
2833
2834 if (graph_width <= max_change) {
2835 int total = scale_linear(add + del, graph_width, max_change);
2836 if (total < 2 && add && del)
2837 /* width >= 2 due to the sanity check */
2838 total = 2;
2839 if (add < del) {
2840 add = scale_linear(add, graph_width, max_change);
2841 del = total - add;
2842 } else {
2843 del = scale_linear(del, graph_width, max_change);
2844 add = total - del;
2845 }
2846 }
2847 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2848 strbuf_addf(&out, " %*"PRIuMAX"%s",
2849 number_width, added + deleted,
2850 added + deleted ? " " : "");
2851 show_graph(&out, '+', add, add_c, reset);
2852 show_graph(&out, '-', del, del_c, reset);
2853 strbuf_addch(&out, '\n');
2854 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2855 out.buf, out.len, 0);
2856 strbuf_reset(&out);
2857 }
2858
2859 for (i = 0; i < data->nr; i++) {
2860 struct diffstat_file *file = data->files[i];
2861 uintmax_t added = file->added;
2862 uintmax_t deleted = file->deleted;
2863
2864 if (file->is_unmerged ||
2865 (!file->is_interesting && (added + deleted == 0))) {
2866 total_files--;
2867 continue;
2868 }
2869
2870 if (!file->is_binary) {
2871 adds += added;
2872 dels += deleted;
2873 }
2874 if (i < count)
2875 continue;
2876 if (!extra_shown)
2877 emit_diff_symbol(options,
2878 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2879 NULL, 0, 0);
2880 extra_shown = 1;
2881 }
2882
2883 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2884 strbuf_release(&out);
2885 }
2886
2887 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2888 {
2889 int i, adds = 0, dels = 0, total_files = data->nr;
2890
2891 if (data->nr == 0)
2892 return;
2893
2894 for (i = 0; i < data->nr; i++) {
2895 int added = data->files[i]->added;
2896 int deleted = data->files[i]->deleted;
2897
2898 if (data->files[i]->is_unmerged ||
2899 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2900 total_files--;
2901 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2902 adds += added;
2903 dels += deleted;
2904 }
2905 }
2906 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2907 }
2908
2909 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2910 {
2911 int i;
2912
2913 if (data->nr == 0)
2914 return;
2915
2916 for (i = 0; i < data->nr; i++) {
2917 struct diffstat_file *file = data->files[i];
2918
2919 fprintf(options->file, "%s", diff_line_prefix(options));
2920
2921 if (file->is_binary)
2922 fprintf(options->file, "-\t-\t");
2923 else
2924 fprintf(options->file,
2925 "%"PRIuMAX"\t%"PRIuMAX"\t",
2926 file->added, file->deleted);
2927 if (options->line_termination) {
2928 fill_print_name(file);
2929 if (!file->is_renamed)
2930 write_name_quoted(file->name, options->file,
2931 options->line_termination);
2932 else {
2933 fputs(file->print_name, options->file);
2934 putc(options->line_termination, options->file);
2935 }
2936 } else {
2937 if (file->is_renamed) {
2938 putc('\0', options->file);
2939 write_name_quoted(file->from_name, options->file, '\0');
2940 }
2941 write_name_quoted(file->name, options->file, '\0');
2942 }
2943 }
2944 }
2945
2946 struct dirstat_file {
2947 const char *name;
2948 unsigned long changed;
2949 };
2950
2951 struct dirstat_dir {
2952 struct dirstat_file *files;
2953 int alloc, nr, permille, cumulative;
2954 };
2955
2956 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2957 unsigned long changed, const char *base, int baselen)
2958 {
2959 unsigned long sum_changes = 0;
2960 unsigned int sources = 0;
2961 const char *line_prefix = diff_line_prefix(opt);
2962
2963 while (dir->nr) {
2964 struct dirstat_file *f = dir->files;
2965 int namelen = strlen(f->name);
2966 unsigned long changes;
2967 char *slash;
2968
2969 if (namelen < baselen)
2970 break;
2971 if (memcmp(f->name, base, baselen))
2972 break;
2973 slash = strchr(f->name + baselen, '/');
2974 if (slash) {
2975 int newbaselen = slash + 1 - f->name;
2976 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2977 sources++;
2978 } else {
2979 changes = f->changed;
2980 dir->files++;
2981 dir->nr--;
2982 sources += 2;
2983 }
2984 sum_changes += changes;
2985 }
2986
2987 /*
2988 * We don't report dirstat's for
2989 * - the top level
2990 * - or cases where everything came from a single directory
2991 * under this directory (sources == 1).
2992 */
2993 if (baselen && sources != 1) {
2994 if (sum_changes) {
2995 int permille = sum_changes * 1000 / changed;
2996 if (permille >= dir->permille) {
2997 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2998 permille / 10, permille % 10, baselen, base);
2999 if (!dir->cumulative)
3000 return 0;
3001 }
3002 }
3003 }
3004 return sum_changes;
3005 }
3006
3007 static int dirstat_compare(const void *_a, const void *_b)
3008 {
3009 const struct dirstat_file *a = _a;
3010 const struct dirstat_file *b = _b;
3011 return strcmp(a->name, b->name);
3012 }
3013
3014 static void show_dirstat(struct diff_options *options)
3015 {
3016 int i;
3017 unsigned long changed;
3018 struct dirstat_dir dir;
3019 struct diff_queue_struct *q = &diff_queued_diff;
3020
3021 dir.files = NULL;
3022 dir.alloc = 0;
3023 dir.nr = 0;
3024 dir.permille = options->dirstat_permille;
3025 dir.cumulative = options->flags.dirstat_cumulative;
3026
3027 changed = 0;
3028 for (i = 0; i < q->nr; i++) {
3029 struct diff_filepair *p = q->queue[i];
3030 const char *name;
3031 unsigned long copied, added, damage;
3032 struct diff_populate_filespec_options dpf_options = {
3033 .check_size_only = 1,
3034 };
3035
3036 name = p->two->path ? p->two->path : p->one->path;
3037
3038 if (p->one->oid_valid && p->two->oid_valid &&
3039 oideq(&p->one->oid, &p->two->oid)) {
3040 /*
3041 * The SHA1 has not changed, so pre-/post-content is
3042 * identical. We can therefore skip looking at the
3043 * file contents altogether.
3044 */
3045 damage = 0;
3046 goto found_damage;
3047 }
3048
3049 if (options->flags.dirstat_by_file) {
3050 /*
3051 * In --dirstat-by-file mode, we don't really need to
3052 * look at the actual file contents at all.
3053 * The fact that the SHA1 changed is enough for us to
3054 * add this file to the list of results
3055 * (with each file contributing equal damage).
3056 */
3057 damage = 1;
3058 goto found_damage;
3059 }
3060
3061 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
3062 diff_populate_filespec(options->repo, p->one, NULL);
3063 diff_populate_filespec(options->repo, p->two, NULL);
3064 diffcore_count_changes(options->repo,
3065 p->one, p->two, NULL, NULL,
3066 &copied, &added);
3067 diff_free_filespec_data(p->one);
3068 diff_free_filespec_data(p->two);
3069 } else if (DIFF_FILE_VALID(p->one)) {
3070 diff_populate_filespec(options->repo, p->one, &dpf_options);
3071 copied = added = 0;
3072 diff_free_filespec_data(p->one);
3073 } else if (DIFF_FILE_VALID(p->two)) {
3074 diff_populate_filespec(options->repo, p->two, &dpf_options);
3075 copied = 0;
3076 added = p->two->size;
3077 diff_free_filespec_data(p->two);
3078 } else
3079 continue;
3080
3081 /*
3082 * Original minus copied is the removed material,
3083 * added is the new material. They are both damages
3084 * made to the preimage.
3085 * If the resulting damage is zero, we know that
3086 * diffcore_count_changes() considers the two entries to
3087 * be identical, but since the oid changed, we
3088 * know that there must have been _some_ kind of change,
3089 * so we force all entries to have damage > 0.
3090 */
3091 damage = (p->one->size - copied) + added;
3092 if (!damage)
3093 damage = 1;
3094
3095 found_damage:
3096 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3097 dir.files[dir.nr].name = name;
3098 dir.files[dir.nr].changed = damage;
3099 changed += damage;
3100 dir.nr++;
3101 }
3102
3103 /* This can happen even with many files, if everything was renames */
3104 if (!changed)
3105 return;
3106
3107 /* Show all directories with more than x% of the changes */
3108 QSORT(dir.files, dir.nr, dirstat_compare);
3109 gather_dirstat(options, &dir, changed, "", 0);
3110 }
3111
3112 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3113 {
3114 int i;
3115 unsigned long changed;
3116 struct dirstat_dir dir;
3117
3118 if (data->nr == 0)
3119 return;
3120
3121 dir.files = NULL;
3122 dir.alloc = 0;
3123 dir.nr = 0;
3124 dir.permille = options->dirstat_permille;
3125 dir.cumulative = options->flags.dirstat_cumulative;
3126
3127 changed = 0;
3128 for (i = 0; i < data->nr; i++) {
3129 struct diffstat_file *file = data->files[i];
3130 unsigned long damage = file->added + file->deleted;
3131 if (file->is_binary)
3132 /*
3133 * binary files counts bytes, not lines. Must find some
3134 * way to normalize binary bytes vs. textual lines.
3135 * The following heuristic assumes that there are 64
3136 * bytes per "line".
3137 * This is stupid and ugly, but very cheap...
3138 */
3139 damage = DIV_ROUND_UP(damage, 64);
3140 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3141 dir.files[dir.nr].name = file->name;
3142 dir.files[dir.nr].changed = damage;
3143 changed += damage;
3144 dir.nr++;
3145 }
3146
3147 /* This can happen even with many files, if everything was renames */
3148 if (!changed)
3149 return;
3150
3151 /* Show all directories with more than x% of the changes */
3152 QSORT(dir.files, dir.nr, dirstat_compare);
3153 gather_dirstat(options, &dir, changed, "", 0);
3154 }
3155
3156 static void free_diffstat_file(struct diffstat_file *f)
3157 {
3158 free(f->print_name);
3159 free(f->name);
3160 free(f->from_name);
3161 free(f);
3162 }
3163
3164 void free_diffstat_info(struct diffstat_t *diffstat)
3165 {
3166 int i;
3167 for (i = 0; i < diffstat->nr; i++)
3168 free_diffstat_file(diffstat->files[i]);
3169 free(diffstat->files);
3170 }
3171
3172 struct checkdiff_t {
3173 const char *filename;
3174 int lineno;
3175 int conflict_marker_size;
3176 struct diff_options *o;
3177 unsigned ws_rule;
3178 unsigned status;
3179 };
3180
3181 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3182 {
3183 char firstchar;
3184 int cnt;
3185
3186 if (len < marker_size + 1)
3187 return 0;
3188 firstchar = line[0];
3189 switch (firstchar) {
3190 case '=': case '>': case '<': case '|':
3191 break;
3192 default:
3193 return 0;
3194 }
3195 for (cnt = 1; cnt < marker_size; cnt++)
3196 if (line[cnt] != firstchar)
3197 return 0;
3198 /* line[1] through line[marker_size-1] are same as firstchar */
3199 if (len < marker_size + 1 || !isspace(line[marker_size]))
3200 return 0;
3201 return 1;
3202 }
3203
3204 static void checkdiff_consume_hunk(void *priv,
3205 long ob, long on, long nb, long nn,
3206 const char *func, long funclen)
3207
3208 {
3209 struct checkdiff_t *data = priv;
3210 data->lineno = nb - 1;
3211 }
3212
3213 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3214 {
3215 struct checkdiff_t *data = priv;
3216 int marker_size = data->conflict_marker_size;
3217 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3218 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3219 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3220 char *err;
3221 const char *line_prefix;
3222
3223 assert(data->o);
3224 line_prefix = diff_line_prefix(data->o);
3225
3226 if (line[0] == '+') {
3227 unsigned bad;
3228 data->lineno++;
3229 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3230 data->status |= 1;
3231 fprintf(data->o->file,
3232 "%s%s:%d: leftover conflict marker\n",
3233 line_prefix, data->filename, data->lineno);
3234 }
3235 bad = ws_check(line + 1, len - 1, data->ws_rule);
3236 if (!bad)
3237 return;
3238 data->status |= bad;
3239 err = whitespace_error_string(bad);
3240 fprintf(data->o->file, "%s%s:%d: %s.\n",
3241 line_prefix, data->filename, data->lineno, err);
3242 free(err);
3243 emit_line(data->o, set, reset, line, 1);
3244 ws_check_emit(line + 1, len - 1, data->ws_rule,
3245 data->o->file, set, reset, ws);
3246 } else if (line[0] == ' ') {
3247 data->lineno++;
3248 }
3249 }
3250
3251 static unsigned char *deflate_it(char *data,
3252 unsigned long size,
3253 unsigned long *result_size)
3254 {
3255 int bound;
3256 unsigned char *deflated;
3257 git_zstream stream;
3258
3259 git_deflate_init(&stream, zlib_compression_level);
3260 bound = git_deflate_bound(&stream, size);
3261 deflated = xmalloc(bound);
3262 stream.next_out = deflated;
3263 stream.avail_out = bound;
3264
3265 stream.next_in = (unsigned char *)data;
3266 stream.avail_in = size;
3267 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3268 ; /* nothing */
3269 git_deflate_end(&stream);
3270 *result_size = stream.total_out;
3271 return deflated;
3272 }
3273
3274 static void emit_binary_diff_body(struct diff_options *o,
3275 mmfile_t *one, mmfile_t *two)
3276 {
3277 void *cp;
3278 void *delta;
3279 void *deflated;
3280 void *data;
3281 unsigned long orig_size;
3282 unsigned long delta_size;
3283 unsigned long deflate_size;
3284 unsigned long data_size;
3285
3286 /* We could do deflated delta, or we could do just deflated two,
3287 * whichever is smaller.
3288 */
3289 delta = NULL;
3290 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3291 if (one->size && two->size) {
3292 delta = diff_delta(one->ptr, one->size,
3293 two->ptr, two->size,
3294 &delta_size, deflate_size);
3295 if (delta) {
3296 void *to_free = delta;
3297 orig_size = delta_size;
3298 delta = deflate_it(delta, delta_size, &delta_size);
3299 free(to_free);
3300 }
3301 }
3302
3303 if (delta && delta_size < deflate_size) {
3304 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3305 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3306 s, strlen(s), 0);
3307 free(s);
3308 free(deflated);
3309 data = delta;
3310 data_size = delta_size;
3311 } else {
3312 char *s = xstrfmt("%lu", two->size);
3313 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3314 s, strlen(s), 0);
3315 free(s);
3316 free(delta);
3317 data = deflated;
3318 data_size = deflate_size;
3319 }
3320
3321 /* emit data encoded in base85 */
3322 cp = data;
3323 while (data_size) {
3324 int len;
3325 int bytes = (52 < data_size) ? 52 : data_size;
3326 char line[71];
3327 data_size -= bytes;
3328 if (bytes <= 26)
3329 line[0] = bytes + 'A' - 1;
3330 else
3331 line[0] = bytes - 26 + 'a' - 1;
3332 encode_85(line + 1, cp, bytes);
3333 cp = (char *) cp + bytes;
3334
3335 len = strlen(line);
3336 line[len++] = '\n';
3337 line[len] = '\0';
3338
3339 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3340 line, len, 0);
3341 }
3342 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3343 free(data);
3344 }
3345
3346 static void emit_binary_diff(struct diff_options *o,
3347 mmfile_t *one, mmfile_t *two)
3348 {
3349 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3350 emit_binary_diff_body(o, one, two);
3351 emit_binary_diff_body(o, two, one);
3352 }
3353
3354 int diff_filespec_is_binary(struct repository *r,
3355 struct diff_filespec *one)
3356 {
3357 struct diff_populate_filespec_options dpf_options = {
3358 .check_binary = 1,
3359 };
3360
3361 if (one->is_binary == -1) {
3362 diff_filespec_load_driver(one, r->index);
3363 if (one->driver->binary != -1)
3364 one->is_binary = one->driver->binary;
3365 else {
3366 if (!one->data && DIFF_FILE_VALID(one))
3367 diff_populate_filespec(r, one, &dpf_options);
3368 if (one->is_binary == -1 && one->data)
3369 one->is_binary = buffer_is_binary(one->data,
3370 one->size);
3371 if (one->is_binary == -1)
3372 one->is_binary = 0;
3373 }
3374 }
3375 return one->is_binary;
3376 }
3377
3378 static const struct userdiff_funcname *
3379 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3380 {
3381 diff_filespec_load_driver(one, o->repo->index);
3382 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3383 }
3384
3385 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3386 {
3387 if (!options->a_prefix)
3388 options->a_prefix = a;
3389 if (!options->b_prefix)
3390 options->b_prefix = b;
3391 }
3392
3393 struct userdiff_driver *get_textconv(struct repository *r,
3394 struct diff_filespec *one)
3395 {
3396 if (!DIFF_FILE_VALID(one))
3397 return NULL;
3398
3399 diff_filespec_load_driver(one, r->index);
3400 return userdiff_get_textconv(r, one->driver);
3401 }
3402
3403 static void builtin_diff(const char *name_a,
3404 const char *name_b,
3405 struct diff_filespec *one,
3406 struct diff_filespec *two,
3407 const char *xfrm_msg,
3408 int must_show_header,
3409 struct diff_options *o,
3410 int complete_rewrite)
3411 {
3412 mmfile_t mf1, mf2;
3413 const char *lbl[2];
3414 char *a_one, *b_two;
3415 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3416 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3417 const char *a_prefix, *b_prefix;
3418 struct userdiff_driver *textconv_one = NULL;
3419 struct userdiff_driver *textconv_two = NULL;
3420 struct strbuf header = STRBUF_INIT;
3421 const char *line_prefix = diff_line_prefix(o);
3422
3423 diff_set_mnemonic_prefix(o, "a/", "b/");
3424 if (o->flags.reverse_diff) {
3425 a_prefix = o->b_prefix;
3426 b_prefix = o->a_prefix;
3427 } else {
3428 a_prefix = o->a_prefix;
3429 b_prefix = o->b_prefix;
3430 }
3431
3432 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3433 (!one->mode || S_ISGITLINK(one->mode)) &&
3434 (!two->mode || S_ISGITLINK(two->mode))) {
3435 show_submodule_diff_summary(o, one->path ? one->path : two->path,
3436 &one->oid, &two->oid,
3437 two->dirty_submodule);
3438 return;
3439 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3440 (!one->mode || S_ISGITLINK(one->mode)) &&
3441 (!two->mode || S_ISGITLINK(two->mode))) {
3442 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3443 &one->oid, &two->oid,
3444 two->dirty_submodule);
3445 return;
3446 }
3447
3448 if (o->flags.allow_textconv) {
3449 textconv_one = get_textconv(o->repo, one);
3450 textconv_two = get_textconv(o->repo, two);
3451 }
3452
3453 /* Never use a non-valid filename anywhere if at all possible */
3454 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3455 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3456
3457 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3458 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3459 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3460 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3461 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3462 if (lbl[0][0] == '/') {
3463 /* /dev/null */
3464 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3465 if (xfrm_msg)
3466 strbuf_addstr(&header, xfrm_msg);
3467 must_show_header = 1;
3468 }
3469 else if (lbl[1][0] == '/') {
3470 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3471 if (xfrm_msg)
3472 strbuf_addstr(&header, xfrm_msg);
3473 must_show_header = 1;
3474 }
3475 else {
3476 if (one->mode != two->mode) {
3477 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3478 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3479 must_show_header = 1;
3480 }
3481 if (xfrm_msg)
3482 strbuf_addstr(&header, xfrm_msg);
3483
3484 /*
3485 * we do not run diff between different kind
3486 * of objects.
3487 */
3488 if ((one->mode ^ two->mode) & S_IFMT)
3489 goto free_ab_and_return;
3490 if (complete_rewrite &&
3491 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3492 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3493 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3494 header.buf, header.len, 0);
3495 strbuf_reset(&header);
3496 emit_rewrite_diff(name_a, name_b, one, two,
3497 textconv_one, textconv_two, o);
3498 o->found_changes = 1;
3499 goto free_ab_and_return;
3500 }
3501 }
3502
3503 if (o->irreversible_delete && lbl[1][0] == '/') {
3504 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3505 header.len, 0);
3506 strbuf_reset(&header);
3507 goto free_ab_and_return;
3508 } else if (!o->flags.text &&
3509 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3510 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3511 struct strbuf sb = STRBUF_INIT;
3512 if (!one->data && !two->data &&
3513 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3514 !o->flags.binary) {
3515 if (oideq(&one->oid, &two->oid)) {
3516 if (must_show_header)
3517 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3518 header.buf, header.len,
3519 0);
3520 goto free_ab_and_return;
3521 }
3522 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3523 header.buf, header.len, 0);
3524 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3525 diff_line_prefix(o), lbl[0], lbl[1]);
3526 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3527 sb.buf, sb.len, 0);
3528 strbuf_release(&sb);
3529 goto free_ab_and_return;
3530 }
3531 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3532 fill_mmfile(o->repo, &mf2, two) < 0)
3533 die("unable to read files to diff");
3534 /* Quite common confusing case */
3535 if (mf1.size == mf2.size &&
3536 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3537 if (must_show_header)
3538 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3539 header.buf, header.len, 0);
3540 goto free_ab_and_return;
3541 }
3542 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3543 strbuf_reset(&header);
3544 if (o->flags.binary)
3545 emit_binary_diff(o, &mf1, &mf2);
3546 else {
3547 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3548 diff_line_prefix(o), lbl[0], lbl[1]);
3549 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3550 sb.buf, sb.len, 0);
3551 strbuf_release(&sb);
3552 }
3553 o->found_changes = 1;
3554 } else {
3555 /* Crazy xdl interfaces.. */
3556 const char *diffopts;
3557 const char *v;
3558 xpparam_t xpp;
3559 xdemitconf_t xecfg;
3560 struct emit_callback ecbdata;
3561 const struct userdiff_funcname *pe;
3562
3563 if (must_show_header) {
3564 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3565 header.buf, header.len, 0);
3566 strbuf_reset(&header);
3567 }
3568
3569 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3570 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3571
3572 pe = diff_funcname_pattern(o, one);
3573 if (!pe)
3574 pe = diff_funcname_pattern(o, two);
3575
3576 memset(&xpp, 0, sizeof(xpp));
3577 memset(&xecfg, 0, sizeof(xecfg));
3578 memset(&ecbdata, 0, sizeof(ecbdata));
3579 if (o->flags.suppress_diff_headers)
3580 lbl[0] = NULL;
3581 ecbdata.label_path = lbl;
3582 ecbdata.color_diff = want_color(o->use_color);
3583 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3584 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3585 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3586 ecbdata.opt = o;
3587 if (header.len && !o->flags.suppress_diff_headers)
3588 ecbdata.header = &header;
3589 xpp.flags = o->xdl_opts;
3590 xpp.ignore_regex = o->ignore_regex;
3591 xpp.ignore_regex_nr = o->ignore_regex_nr;
3592 xpp.anchors = o->anchors;
3593 xpp.anchors_nr = o->anchors_nr;
3594 xecfg.ctxlen = o->context;
3595 xecfg.interhunkctxlen = o->interhunkcontext;
3596 xecfg.flags = XDL_EMIT_FUNCNAMES;
3597 if (o->flags.funccontext)
3598 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3599 if (pe)
3600 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3601
3602 diffopts = getenv("GIT_DIFF_OPTS");
3603 if (!diffopts)
3604 ;
3605 else if (skip_prefix(diffopts, "--unified=", &v))
3606 xecfg.ctxlen = strtoul(v, NULL, 10);
3607 else if (skip_prefix(diffopts, "-u", &v))
3608 xecfg.ctxlen = strtoul(v, NULL, 10);
3609
3610 if (o->word_diff)
3611 init_diff_words_data(&ecbdata, o, one, two);
3612 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3613 &ecbdata, &xpp, &xecfg))
3614 die("unable to generate diff for %s", one->path);
3615 if (o->word_diff)
3616 free_diff_words_data(&ecbdata);
3617 if (textconv_one)
3618 free(mf1.ptr);
3619 if (textconv_two)
3620 free(mf2.ptr);
3621 xdiff_clear_find_func(&xecfg);
3622 }
3623
3624 free_ab_and_return:
3625 strbuf_release(&header);
3626 diff_free_filespec_data(one);
3627 diff_free_filespec_data(two);
3628 free(a_one);
3629 free(b_two);
3630 return;
3631 }
3632
3633 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3634 {
3635 if (!is_renamed) {
3636 if (p->status == DIFF_STATUS_ADDED) {
3637 if (S_ISLNK(p->two->mode))
3638 return "new +l";
3639 else if ((p->two->mode & 0777) == 0755)
3640 return "new +x";
3641 else
3642 return "new";
3643 } else if (p->status == DIFF_STATUS_DELETED)
3644 return "gone";
3645 }
3646 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3647 return "mode -l";
3648 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3649 return "mode +l";
3650 else if ((p->one->mode & 0777) == 0644 &&
3651 (p->two->mode & 0777) == 0755)
3652 return "mode +x";
3653 else if ((p->one->mode & 0777) == 0755 &&
3654 (p->two->mode & 0777) == 0644)
3655 return "mode -x";
3656 return NULL;
3657 }
3658
3659 static void builtin_diffstat(const char *name_a, const char *name_b,
3660 struct diff_filespec *one,
3661 struct diff_filespec *two,
3662 struct diffstat_t *diffstat,
3663 struct diff_options *o,
3664 struct diff_filepair *p)
3665 {
3666 mmfile_t mf1, mf2;
3667 struct diffstat_file *data;
3668 int may_differ;
3669 int complete_rewrite = 0;
3670
3671 if (!DIFF_PAIR_UNMERGED(p)) {
3672 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3673 complete_rewrite = 1;
3674 }
3675
3676 data = diffstat_add(diffstat, name_a, name_b);
3677 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3678 if (o->flags.stat_with_summary)
3679 data->comments = get_compact_summary(p, data->is_renamed);
3680
3681 if (!one || !two) {
3682 data->is_unmerged = 1;
3683 return;
3684 }
3685
3686 /* saves some reads if true, not a guarantee of diff outcome */
3687 may_differ = !(one->oid_valid && two->oid_valid &&
3688 oideq(&one->oid, &two->oid));
3689
3690 if (diff_filespec_is_binary(o->repo, one) ||
3691 diff_filespec_is_binary(o->repo, two)) {
3692 data->is_binary = 1;
3693 if (!may_differ) {
3694 data->added = 0;
3695 data->deleted = 0;
3696 } else {
3697 data->added = diff_filespec_size(o->repo, two);
3698 data->deleted = diff_filespec_size(o->repo, one);
3699 }
3700 }
3701
3702 else if (complete_rewrite) {
3703 diff_populate_filespec(o->repo, one, NULL);
3704 diff_populate_filespec(o->repo, two, NULL);
3705 data->deleted = count_lines(one->data, one->size);
3706 data->added = count_lines(two->data, two->size);
3707 }
3708
3709 else if (may_differ) {
3710 /* Crazy xdl interfaces.. */
3711 xpparam_t xpp;
3712 xdemitconf_t xecfg;
3713
3714 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3715 fill_mmfile(o->repo, &mf2, two) < 0)
3716 die("unable to read files to diff");
3717
3718 memset(&xpp, 0, sizeof(xpp));
3719 memset(&xecfg, 0, sizeof(xecfg));
3720 xpp.flags = o->xdl_opts;
3721 xpp.ignore_regex = o->ignore_regex;
3722 xpp.ignore_regex_nr = o->ignore_regex_nr;
3723 xpp.anchors = o->anchors;
3724 xpp.anchors_nr = o->anchors_nr;
3725 xecfg.ctxlen = o->context;
3726 xecfg.interhunkctxlen = o->interhunkcontext;
3727 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
3728 diffstat_consume, diffstat, &xpp, &xecfg))
3729 die("unable to generate diffstat for %s", one->path);
3730
3731 if (DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two)) {
3732 struct diffstat_file *file =
3733 diffstat->files[diffstat->nr - 1];
3734 /*
3735 * Omit diffstats of modified files where nothing changed.
3736 * Even if may_differ, this might be the case due to
3737 * ignoring whitespace changes, etc.
3738 *
3739 * But note that we special-case additions, deletions,
3740 * renames, and mode changes as adding an empty file,
3741 * for example is still of interest.
3742 */
3743 if ((p->status == DIFF_STATUS_MODIFIED)
3744 && !file->added
3745 && !file->deleted
3746 && one->mode == two->mode) {
3747 free_diffstat_file(file);
3748 diffstat->nr--;
3749 }
3750 }
3751 }
3752
3753 diff_free_filespec_data(one);
3754 diff_free_filespec_data(two);
3755 }
3756
3757 static void builtin_checkdiff(const char *name_a, const char *name_b,
3758 const char *attr_path,
3759 struct diff_filespec *one,
3760 struct diff_filespec *two,
3761 struct diff_options *o)
3762 {
3763 mmfile_t mf1, mf2;
3764 struct checkdiff_t data;
3765
3766 if (!two)
3767 return;
3768
3769 memset(&data, 0, sizeof(data));
3770 data.filename = name_b ? name_b : name_a;
3771 data.lineno = 0;
3772 data.o = o;
3773 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3774 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3775
3776 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3777 fill_mmfile(o->repo, &mf2, two) < 0)
3778 die("unable to read files to diff");
3779
3780 /*
3781 * All the other codepaths check both sides, but not checking
3782 * the "old" side here is deliberate. We are checking the newly
3783 * introduced changes, and as long as the "new" side is text, we
3784 * can and should check what it introduces.
3785 */
3786 if (diff_filespec_is_binary(o->repo, two))
3787 goto free_and_return;
3788 else {
3789 /* Crazy xdl interfaces.. */
3790 xpparam_t xpp;
3791 xdemitconf_t xecfg;
3792
3793 memset(&xpp, 0, sizeof(xpp));
3794 memset(&xecfg, 0, sizeof(xecfg));
3795 xecfg.ctxlen = 1; /* at least one context line */
3796 xpp.flags = 0;
3797 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3798 checkdiff_consume, &data,
3799 &xpp, &xecfg))
3800 die("unable to generate checkdiff for %s", one->path);
3801
3802 if (data.ws_rule & WS_BLANK_AT_EOF) {
3803 struct emit_callback ecbdata;
3804 int blank_at_eof;
3805
3806 ecbdata.ws_rule = data.ws_rule;
3807 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3808 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3809
3810 if (blank_at_eof) {
3811 static char *err;
3812 if (!err)
3813 err = whitespace_error_string(WS_BLANK_AT_EOF);
3814 fprintf(o->file, "%s:%d: %s.\n",
3815 data.filename, blank_at_eof, err);
3816 data.status = 1; /* report errors */
3817 }
3818 }
3819 }
3820 free_and_return:
3821 diff_free_filespec_data(one);
3822 diff_free_filespec_data(two);
3823 if (data.status)
3824 o->flags.check_failed = 1;
3825 }
3826
3827 struct diff_filespec *alloc_filespec(const char *path)
3828 {
3829 struct diff_filespec *spec;
3830
3831 FLEXPTR_ALLOC_STR(spec, path, path);
3832 spec->count = 1;
3833 spec->is_binary = -1;
3834 return spec;
3835 }
3836
3837 void free_filespec(struct diff_filespec *spec)
3838 {
3839 if (!--spec->count) {
3840 diff_free_filespec_data(spec);
3841 free(spec);
3842 }
3843 }
3844
3845 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3846 int oid_valid, unsigned short mode)
3847 {
3848 if (mode) {
3849 spec->mode = canon_mode(mode);
3850 oidcpy(&spec->oid, oid);
3851 spec->oid_valid = oid_valid;
3852 }
3853 }
3854
3855 /*
3856 * Given a name and sha1 pair, if the index tells us the file in
3857 * the work tree has that object contents, return true, so that
3858 * prepare_temp_file() does not have to inflate and extract.
3859 */
3860 static int reuse_worktree_file(struct index_state *istate,
3861 const char *name,
3862 const struct object_id *oid,
3863 int want_file)
3864 {
3865 const struct cache_entry *ce;
3866 struct stat st;
3867 int pos, len;
3868
3869 /*
3870 * We do not read the cache ourselves here, because the
3871 * benchmark with my previous version that always reads cache
3872 * shows that it makes things worse for diff-tree comparing
3873 * two linux-2.6 kernel trees in an already checked out work
3874 * tree. This is because most diff-tree comparisons deal with
3875 * only a small number of files, while reading the cache is
3876 * expensive for a large project, and its cost outweighs the
3877 * savings we get by not inflating the object to a temporary
3878 * file. Practically, this code only helps when we are used
3879 * by diff-cache --cached, which does read the cache before
3880 * calling us.
3881 */
3882 if (!istate->cache)
3883 return 0;
3884
3885 /* We want to avoid the working directory if our caller
3886 * doesn't need the data in a normal file, this system
3887 * is rather slow with its stat/open/mmap/close syscalls,
3888 * and the object is contained in a pack file. The pack
3889 * is probably already open and will be faster to obtain
3890 * the data through than the working directory. Loose
3891 * objects however would tend to be slower as they need
3892 * to be individually opened and inflated.
3893 */
3894 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3895 return 0;
3896
3897 /*
3898 * Similarly, if we'd have to convert the file contents anyway, that
3899 * makes the optimization not worthwhile.
3900 */
3901 if (!want_file && would_convert_to_git(istate, name))
3902 return 0;
3903
3904 len = strlen(name);
3905 pos = index_name_pos(istate, name, len);
3906 if (pos < 0)
3907 return 0;
3908 ce = istate->cache[pos];
3909
3910 /*
3911 * This is not the sha1 we are looking for, or
3912 * unreusable because it is not a regular file.
3913 */
3914 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3915 return 0;
3916
3917 /*
3918 * If ce is marked as "assume unchanged", there is no
3919 * guarantee that work tree matches what we are looking for.
3920 */
3921 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3922 return 0;
3923
3924 /*
3925 * If ce matches the file in the work tree, we can reuse it.
3926 */
3927 if (ce_uptodate(ce) ||
3928 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3929 return 1;
3930
3931 return 0;
3932 }
3933
3934 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3935 {
3936 struct strbuf buf = STRBUF_INIT;
3937 char *dirty = "";
3938
3939 /* Are we looking at the work tree? */
3940 if (s->dirty_submodule)
3941 dirty = "-dirty";
3942
3943 strbuf_addf(&buf, "Subproject commit %s%s\n",
3944 oid_to_hex(&s->oid), dirty);
3945 s->size = buf.len;
3946 if (size_only) {
3947 s->data = NULL;
3948 strbuf_release(&buf);
3949 } else {
3950 s->data = strbuf_detach(&buf, NULL);
3951 s->should_free = 1;
3952 }
3953 return 0;
3954 }
3955
3956 /*
3957 * While doing rename detection and pickaxe operation, we may need to
3958 * grab the data for the blob (or file) for our own in-core comparison.
3959 * diff_filespec has data and size fields for this purpose.
3960 */
3961 int diff_populate_filespec(struct repository *r,
3962 struct diff_filespec *s,
3963 const struct diff_populate_filespec_options *options)
3964 {
3965 int size_only = options ? options->check_size_only : 0;
3966 int check_binary = options ? options->check_binary : 0;
3967 int err = 0;
3968 int conv_flags = global_conv_flags_eol;
3969 /*
3970 * demote FAIL to WARN to allow inspecting the situation
3971 * instead of refusing.
3972 */
3973 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3974 conv_flags = CONV_EOL_RNDTRP_WARN;
3975
3976 if (!DIFF_FILE_VALID(s))
3977 die("internal error: asking to populate invalid file.");
3978 if (S_ISDIR(s->mode))
3979 return -1;
3980
3981 if (s->data)
3982 return 0;
3983
3984 if (size_only && 0 < s->size)
3985 return 0;
3986
3987 if (S_ISGITLINK(s->mode))
3988 return diff_populate_gitlink(s, size_only);
3989
3990 if (!s->oid_valid ||
3991 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3992 struct strbuf buf = STRBUF_INIT;
3993 struct stat st;
3994 int fd;
3995
3996 if (lstat(s->path, &st) < 0) {
3997 err_empty:
3998 err = -1;
3999 empty:
4000 s->data = (char *)"";
4001 s->size = 0;
4002 return err;
4003 }
4004 s->size = xsize_t(st.st_size);
4005 if (!s->size)
4006 goto empty;
4007 if (S_ISLNK(st.st_mode)) {
4008 struct strbuf sb = STRBUF_INIT;
4009
4010 if (strbuf_readlink(&sb, s->path, s->size))
4011 goto err_empty;
4012 s->size = sb.len;
4013 s->data = strbuf_detach(&sb, NULL);
4014 s->should_free = 1;
4015 return 0;
4016 }
4017
4018 /*
4019 * Even if the caller would be happy with getting
4020 * only the size, we cannot return early at this
4021 * point if the path requires us to run the content
4022 * conversion.
4023 */
4024 if (size_only && !would_convert_to_git(r->index, s->path))
4025 return 0;
4026
4027 /*
4028 * Note: this check uses xsize_t(st.st_size) that may
4029 * not be the true size of the blob after it goes
4030 * through convert_to_git(). This may not strictly be
4031 * correct, but the whole point of big_file_threshold
4032 * and is_binary check being that we want to avoid
4033 * opening the file and inspecting the contents, this
4034 * is probably fine.
4035 */
4036 if (check_binary &&
4037 s->size > big_file_threshold && s->is_binary == -1) {
4038 s->is_binary = 1;
4039 return 0;
4040 }
4041 fd = open(s->path, O_RDONLY);
4042 if (fd < 0)
4043 goto err_empty;
4044 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
4045 close(fd);
4046 s->should_munmap = 1;
4047
4048 /*
4049 * Convert from working tree format to canonical git format
4050 */
4051 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
4052 size_t size = 0;
4053 munmap(s->data, s->size);
4054 s->should_munmap = 0;
4055 s->data = strbuf_detach(&buf, &size);
4056 s->size = size;
4057 s->should_free = 1;
4058 }
4059 }
4060 else {
4061 struct object_info info = {
4062 .sizep = &s->size
4063 };
4064
4065 if (!(size_only || check_binary))
4066 /*
4067 * Set contentp, since there is no chance that merely
4068 * the size is sufficient.
4069 */
4070 info.contentp = &s->data;
4071
4072 if (options && options->missing_object_cb) {
4073 if (!oid_object_info_extended(r, &s->oid, &info,
4074 OBJECT_INFO_LOOKUP_REPLACE |
4075 OBJECT_INFO_SKIP_FETCH_OBJECT))
4076 goto object_read;
4077 options->missing_object_cb(options->missing_object_data);
4078 }
4079 if (oid_object_info_extended(r, &s->oid, &info,
4080 OBJECT_INFO_LOOKUP_REPLACE))
4081 die("unable to read %s", oid_to_hex(&s->oid));
4082
4083 object_read:
4084 if (size_only || check_binary) {
4085 if (size_only)
4086 return 0;
4087 if (s->size > big_file_threshold && s->is_binary == -1) {
4088 s->is_binary = 1;
4089 return 0;
4090 }
4091 }
4092 if (!info.contentp) {
4093 info.contentp = &s->data;
4094 if (oid_object_info_extended(r, &s->oid, &info,
4095 OBJECT_INFO_LOOKUP_REPLACE))
4096 die("unable to read %s", oid_to_hex(&s->oid));
4097 }
4098 s->should_free = 1;
4099 }
4100 return 0;
4101 }
4102
4103 void diff_free_filespec_blob(struct diff_filespec *s)
4104 {
4105 if (s->should_free)
4106 free(s->data);
4107 else if (s->should_munmap)
4108 munmap(s->data, s->size);
4109
4110 if (s->should_free || s->should_munmap) {
4111 s->should_free = s->should_munmap = 0;
4112 s->data = NULL;
4113 }
4114 }
4115
4116 void diff_free_filespec_data(struct diff_filespec *s)
4117 {
4118 if (!s)
4119 return;
4120
4121 diff_free_filespec_blob(s);
4122 FREE_AND_NULL(s->cnt_data);
4123 }
4124
4125 static void prep_temp_blob(struct index_state *istate,
4126 const char *path, struct diff_tempfile *temp,
4127 void *blob,
4128 unsigned long size,
4129 const struct object_id *oid,
4130 int mode)
4131 {
4132 struct strbuf buf = STRBUF_INIT;
4133 struct strbuf tempfile = STRBUF_INIT;
4134 char *path_dup = xstrdup(path);
4135 const char *base = basename(path_dup);
4136 struct checkout_metadata meta;
4137
4138 init_checkout_metadata(&meta, NULL, NULL, oid);
4139
4140 /* Generate "XXXXXX_basename.ext" */
4141 strbuf_addstr(&tempfile, "XXXXXX_");
4142 strbuf_addstr(&tempfile, base);
4143
4144 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4145 if (!temp->tempfile)
4146 die_errno("unable to create temp-file");
4147 if (convert_to_working_tree(istate, path,
4148 (const char *)blob, (size_t)size, &buf, &meta)) {
4149 blob = buf.buf;
4150 size = buf.len;
4151 }
4152 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4153 close_tempfile_gently(temp->tempfile))
4154 die_errno("unable to write temp-file");
4155 temp->name = get_tempfile_path(temp->tempfile);
4156 oid_to_hex_r(temp->hex, oid);
4157 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4158 strbuf_release(&buf);
4159 strbuf_release(&tempfile);
4160 free(path_dup);
4161 }
4162
4163 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4164 const char *name,
4165 struct diff_filespec *one)
4166 {
4167 struct diff_tempfile *temp = claim_diff_tempfile();
4168
4169 if (!DIFF_FILE_VALID(one)) {
4170 not_a_valid_file:
4171 /* A '-' entry produces this for file-2, and
4172 * a '+' entry produces this for file-1.
4173 */
4174 temp->name = "/dev/null";
4175 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4176 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4177 return temp;
4178 }
4179
4180 if (!S_ISGITLINK(one->mode) &&
4181 (!one->oid_valid ||
4182 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4183 struct stat st;
4184 if (lstat(name, &st) < 0) {
4185 if (errno == ENOENT)
4186 goto not_a_valid_file;
4187 die_errno("stat(%s)", name);
4188 }
4189 if (S_ISLNK(st.st_mode)) {
4190 struct strbuf sb = STRBUF_INIT;
4191 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4192 die_errno("readlink(%s)", name);
4193 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4194 (one->oid_valid ?
4195 &one->oid : &null_oid),
4196 (one->oid_valid ?
4197 one->mode : S_IFLNK));
4198 strbuf_release(&sb);
4199 }
4200 else {
4201 /* we can borrow from the file in the work tree */
4202 temp->name = name;
4203 if (!one->oid_valid)
4204 oid_to_hex_r(temp->hex, &null_oid);
4205 else
4206 oid_to_hex_r(temp->hex, &one->oid);
4207 /* Even though we may sometimes borrow the
4208 * contents from the work tree, we always want
4209 * one->mode. mode is trustworthy even when
4210 * !(one->oid_valid), as long as
4211 * DIFF_FILE_VALID(one).
4212 */
4213 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4214 }
4215 return temp;
4216 }
4217 else {
4218 if (diff_populate_filespec(r, one, NULL))
4219 die("cannot read data blob for %s", one->path);
4220 prep_temp_blob(r->index, name, temp,
4221 one->data, one->size,
4222 &one->oid, one->mode);
4223 }
4224 return temp;
4225 }
4226
4227 static void add_external_diff_name(struct repository *r,
4228 struct strvec *argv,
4229 const char *name,
4230 struct diff_filespec *df)
4231 {
4232 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4233 strvec_push(argv, temp->name);
4234 strvec_push(argv, temp->hex);
4235 strvec_push(argv, temp->mode);
4236 }
4237
4238 /* An external diff command takes:
4239 *
4240 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4241 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4242 *
4243 */
4244 static void run_external_diff(const char *pgm,
4245 const char *name,
4246 const char *other,
4247 struct diff_filespec *one,
4248 struct diff_filespec *two,
4249 const char *xfrm_msg,
4250 struct diff_options *o)
4251 {
4252 struct strvec argv = STRVEC_INIT;
4253 struct strvec env = STRVEC_INIT;
4254 struct diff_queue_struct *q = &diff_queued_diff;
4255
4256 strvec_push(&argv, pgm);
4257 strvec_push(&argv, name);
4258
4259 if (one && two) {
4260 add_external_diff_name(o->repo, &argv, name, one);
4261 if (!other)
4262 add_external_diff_name(o->repo, &argv, name, two);
4263 else {
4264 add_external_diff_name(o->repo, &argv, other, two);
4265 strvec_push(&argv, other);
4266 strvec_push(&argv, xfrm_msg);
4267 }
4268 }
4269
4270 strvec_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4271 strvec_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4272
4273 diff_free_filespec_data(one);
4274 diff_free_filespec_data(two);
4275 if (run_command_v_opt_cd_env(argv.v, RUN_USING_SHELL, NULL, env.v))
4276 die(_("external diff died, stopping at %s"), name);
4277
4278 remove_tempfile();
4279 strvec_clear(&argv);
4280 strvec_clear(&env);
4281 }
4282
4283 static int similarity_index(struct diff_filepair *p)
4284 {
4285 return p->score * 100 / MAX_SCORE;
4286 }
4287
4288 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4289 {
4290 if (startup_info->have_repository)
4291 return find_unique_abbrev(oid, abbrev);
4292 else {
4293 char *hex = oid_to_hex(oid);
4294 if (abbrev < 0)
4295 abbrev = FALLBACK_DEFAULT_ABBREV;
4296 if (abbrev > the_hash_algo->hexsz)
4297 BUG("oid abbreviation out of range: %d", abbrev);
4298 if (abbrev)
4299 hex[abbrev] = '\0';
4300 return hex;
4301 }
4302 }
4303
4304 static void fill_metainfo(struct strbuf *msg,
4305 const char *name,
4306 const char *other,
4307 struct diff_filespec *one,
4308 struct diff_filespec *two,
4309 struct diff_options *o,
4310 struct diff_filepair *p,
4311 int *must_show_header,
4312 int use_color)
4313 {
4314 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4315 const char *reset = diff_get_color(use_color, DIFF_RESET);
4316 const char *line_prefix = diff_line_prefix(o);
4317
4318 *must_show_header = 1;
4319 strbuf_init(msg, PATH_MAX * 2 + 300);
4320 switch (p->status) {
4321 case DIFF_STATUS_COPIED:
4322 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4323 line_prefix, set, similarity_index(p));
4324 strbuf_addf(msg, "%s\n%s%scopy from ",
4325 reset, line_prefix, set);
4326 quote_c_style(name, msg, NULL, 0);
4327 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4328 quote_c_style(other, msg, NULL, 0);
4329 strbuf_addf(msg, "%s\n", reset);
4330 break;
4331 case DIFF_STATUS_RENAMED:
4332 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4333 line_prefix, set, similarity_index(p));
4334 strbuf_addf(msg, "%s\n%s%srename from ",
4335 reset, line_prefix, set);
4336 quote_c_style(name, msg, NULL, 0);
4337 strbuf_addf(msg, "%s\n%s%srename to ",
4338 reset, line_prefix, set);
4339 quote_c_style(other, msg, NULL, 0);
4340 strbuf_addf(msg, "%s\n", reset);
4341 break;
4342 case DIFF_STATUS_MODIFIED:
4343 if (p->score) {
4344 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4345 line_prefix,
4346 set, similarity_index(p), reset);
4347 break;
4348 }
4349 /* fallthru */
4350 default:
4351 *must_show_header = 0;
4352 }
4353 if (one && two && !oideq(&one->oid, &two->oid)) {
4354 const unsigned hexsz = the_hash_algo->hexsz;
4355 int abbrev = o->abbrev ? o->abbrev : DEFAULT_ABBREV;
4356
4357 if (o->flags.full_index)
4358 abbrev = hexsz;
4359
4360 if (o->flags.binary) {
4361 mmfile_t mf;
4362 if ((!fill_mmfile(o->repo, &mf, one) &&
4363 diff_filespec_is_binary(o->repo, one)) ||
4364 (!fill_mmfile(o->repo, &mf, two) &&
4365 diff_filespec_is_binary(o->repo, two)))
4366 abbrev = hexsz;
4367 }
4368 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4369 diff_abbrev_oid(&one->oid, abbrev),
4370 diff_abbrev_oid(&two->oid, abbrev));
4371 if (one->mode == two->mode)
4372 strbuf_addf(msg, " %06o", one->mode);
4373 strbuf_addf(msg, "%s\n", reset);
4374 }
4375 }
4376
4377 static void run_diff_cmd(const char *pgm,
4378 const char *name,
4379 const char *other,
4380 const char *attr_path,
4381 struct diff_filespec *one,
4382 struct diff_filespec *two,
4383 struct strbuf *msg,
4384 struct diff_options *o,
4385 struct diff_filepair *p)
4386 {
4387 const char *xfrm_msg = NULL;
4388 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4389 int must_show_header = 0;
4390
4391
4392 if (o->flags.allow_external) {
4393 struct userdiff_driver *drv;
4394
4395 drv = userdiff_find_by_path(o->repo->index, attr_path);
4396 if (drv && drv->external)
4397 pgm = drv->external;
4398 }
4399
4400 if (msg) {
4401 /*
4402 * don't use colors when the header is intended for an
4403 * external diff driver
4404 */
4405 fill_metainfo(msg, name, other, one, two, o, p,
4406 &must_show_header,
4407 want_color(o->use_color) && !pgm);
4408 xfrm_msg = msg->len ? msg->buf : NULL;
4409 }
4410
4411 if (pgm) {
4412 run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
4413 return;
4414 }
4415 if (one && two)
4416 builtin_diff(name, other ? other : name,
4417 one, two, xfrm_msg, must_show_header,
4418 o, complete_rewrite);
4419 else
4420 fprintf(o->file, "* Unmerged path %s\n", name);
4421 }
4422
4423 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4424 {
4425 if (DIFF_FILE_VALID(one)) {
4426 if (!one->oid_valid) {
4427 struct stat st;
4428 if (one->is_stdin) {
4429 oidclr(&one->oid);
4430 return;
4431 }
4432 if (lstat(one->path, &st) < 0)
4433 die_errno("stat '%s'", one->path);
4434 if (index_path(istate, &one->oid, one->path, &st, 0))
4435 die("cannot hash %s", one->path);
4436 }
4437 }
4438 else
4439 oidclr(&one->oid);
4440 }
4441
4442 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4443 {
4444 /* Strip the prefix but do not molest /dev/null and absolute paths */
4445 if (*namep && !is_absolute_path(*namep)) {
4446 *namep += prefix_length;
4447 if (**namep == '/')
4448 ++*namep;
4449 }
4450 if (*otherp && !is_absolute_path(*otherp)) {
4451 *otherp += prefix_length;
4452 if (**otherp == '/')
4453 ++*otherp;
4454 }
4455 }
4456
4457 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4458 {
4459 const char *pgm = external_diff();
4460 struct strbuf msg;
4461 struct diff_filespec *one = p->one;
4462 struct diff_filespec *two = p->two;
4463 const char *name;
4464 const char *other;
4465 const char *attr_path;
4466
4467 name = one->path;
4468 other = (strcmp(name, two->path) ? two->path : NULL);
4469 attr_path = name;
4470 if (o->prefix_length)
4471 strip_prefix(o->prefix_length, &name, &other);
4472
4473 if (!o->flags.allow_external)
4474 pgm = NULL;
4475
4476 if (DIFF_PAIR_UNMERGED(p)) {
4477 run_diff_cmd(pgm, name, NULL, attr_path,
4478 NULL, NULL, NULL, o, p);
4479 return;
4480 }
4481
4482 diff_fill_oid_info(one, o->repo->index);
4483 diff_fill_oid_info(two, o->repo->index);
4484
4485 if (!pgm &&
4486 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4487 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4488 /*
4489 * a filepair that changes between file and symlink
4490 * needs to be split into deletion and creation.
4491 */
4492 struct diff_filespec *null = alloc_filespec(two->path);
4493 run_diff_cmd(NULL, name, other, attr_path,
4494 one, null, &msg,
4495 o, p);
4496 free(null);
4497 strbuf_release(&msg);
4498
4499 null = alloc_filespec(one->path);
4500 run_diff_cmd(NULL, name, other, attr_path,
4501 null, two, &msg, o, p);
4502 free(null);
4503 }
4504 else
4505 run_diff_cmd(pgm, name, other, attr_path,
4506 one, two, &msg, o, p);
4507
4508 strbuf_release(&msg);
4509 }
4510
4511 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4512 struct diffstat_t *diffstat)
4513 {
4514 const char *name;
4515 const char *other;
4516
4517 if (DIFF_PAIR_UNMERGED(p)) {
4518 /* unmerged */
4519 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4520 diffstat, o, p);
4521 return;
4522 }
4523
4524 name = p->one->path;
4525 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4526
4527 if (o->prefix_length)
4528 strip_prefix(o->prefix_length, &name, &other);
4529
4530 diff_fill_oid_info(p->one, o->repo->index);
4531 diff_fill_oid_info(p->two, o->repo->index);
4532
4533 builtin_diffstat(name, other, p->one, p->two,
4534 diffstat, o, p);
4535 }
4536
4537 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4538 {
4539 const char *name;
4540 const char *other;
4541 const char *attr_path;
4542
4543 if (DIFF_PAIR_UNMERGED(p)) {
4544 /* unmerged */
4545 return;
4546 }
4547
4548 name = p->one->path;
4549 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4550 attr_path = other ? other : name;
4551
4552 if (o->prefix_length)
4553 strip_prefix(o->prefix_length, &name, &other);
4554
4555 diff_fill_oid_info(p->one, o->repo->index);
4556 diff_fill_oid_info(p->two, o->repo->index);
4557
4558 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4559 }
4560
4561 static void prep_parse_options(struct diff_options *options);
4562
4563 void repo_diff_setup(struct repository *r, struct diff_options *options)
4564 {
4565 memcpy(options, &default_diff_options, sizeof(*options));
4566
4567 options->file = stdout;
4568 options->repo = r;
4569
4570 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4571 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4572 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4573 options->abbrev = DEFAULT_ABBREV;
4574 options->line_termination = '\n';
4575 options->break_opt = -1;
4576 options->rename_limit = -1;
4577 options->dirstat_permille = diff_dirstat_permille_default;
4578 options->context = diff_context_default;
4579 options->interhunkcontext = diff_interhunk_context_default;
4580 options->ws_error_highlight = ws_error_highlight_default;
4581 options->flags.rename_empty = 1;
4582 options->flags.relative_name = diff_relative;
4583 options->objfind = NULL;
4584
4585 /* pathchange left =NULL by default */
4586 options->change = diff_change;
4587 options->add_remove = diff_addremove;
4588 options->use_color = diff_use_color_default;
4589 options->detect_rename = diff_detect_rename_default;
4590 options->xdl_opts |= diff_algorithm;
4591 if (diff_indent_heuristic)
4592 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4593
4594 options->orderfile = diff_order_file_cfg;
4595
4596 if (diff_no_prefix) {
4597 options->a_prefix = options->b_prefix = "";
4598 } else if (!diff_mnemonic_prefix) {
4599 options->a_prefix = "a/";
4600 options->b_prefix = "b/";
4601 }
4602
4603 options->color_moved = diff_color_moved_default;
4604 options->color_moved_ws_handling = diff_color_moved_ws_default;
4605
4606 prep_parse_options(options);
4607 }
4608
4609 void diff_setup_done(struct diff_options *options)
4610 {
4611 unsigned check_mask = DIFF_FORMAT_NAME |
4612 DIFF_FORMAT_NAME_STATUS |
4613 DIFF_FORMAT_CHECKDIFF |
4614 DIFF_FORMAT_NO_OUTPUT;
4615 /*
4616 * This must be signed because we're comparing against a potentially
4617 * negative value.
4618 */
4619 const int hexsz = the_hash_algo->hexsz;
4620
4621 if (options->set_default)
4622 options->set_default(options);
4623
4624 if (HAS_MULTI_BITS(options->output_format & check_mask))
4625 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4626
4627 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4628 die(_("-G, -S and --find-object are mutually exclusive"));
4629
4630 /*
4631 * Most of the time we can say "there are changes"
4632 * only by checking if there are changed paths, but
4633 * --ignore-whitespace* options force us to look
4634 * inside contents.
4635 */
4636
4637 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS) ||
4638 options->ignore_regex_nr)
4639 options->flags.diff_from_contents = 1;
4640 else
4641 options->flags.diff_from_contents = 0;
4642
4643 if (options->flags.find_copies_harder)
4644 options->detect_rename = DIFF_DETECT_COPY;
4645
4646 if (!options->flags.relative_name)
4647 options->prefix = NULL;
4648 if (options->prefix)
4649 options->prefix_length = strlen(options->prefix);
4650 else
4651 options->prefix_length = 0;
4652
4653 if (options->output_format & (DIFF_FORMAT_NAME |
4654 DIFF_FORMAT_NAME_STATUS |
4655 DIFF_FORMAT_CHECKDIFF |
4656 DIFF_FORMAT_NO_OUTPUT))
4657 options->output_format &= ~(DIFF_FORMAT_RAW |
4658 DIFF_FORMAT_NUMSTAT |
4659 DIFF_FORMAT_DIFFSTAT |
4660 DIFF_FORMAT_SHORTSTAT |
4661 DIFF_FORMAT_DIRSTAT |
4662 DIFF_FORMAT_SUMMARY |
4663 DIFF_FORMAT_PATCH);
4664
4665 /*
4666 * These cases always need recursive; we do not drop caller-supplied
4667 * recursive bits for other formats here.
4668 */
4669 if (options->output_format & (DIFF_FORMAT_PATCH |
4670 DIFF_FORMAT_NUMSTAT |
4671 DIFF_FORMAT_DIFFSTAT |
4672 DIFF_FORMAT_SHORTSTAT |
4673 DIFF_FORMAT_DIRSTAT |
4674 DIFF_FORMAT_SUMMARY |
4675 DIFF_FORMAT_CHECKDIFF))
4676 options->flags.recursive = 1;
4677 /*
4678 * Also pickaxe would not work very well if you do not say recursive
4679 */
4680 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4681 options->flags.recursive = 1;
4682 /*
4683 * When patches are generated, submodules diffed against the work tree
4684 * must be checked for dirtiness too so it can be shown in the output
4685 */
4686 if (options->output_format & DIFF_FORMAT_PATCH)
4687 options->flags.dirty_submodules = 1;
4688
4689 if (options->detect_rename && options->rename_limit < 0)
4690 options->rename_limit = diff_rename_limit_default;
4691 if (hexsz < options->abbrev)
4692 options->abbrev = hexsz; /* full */
4693
4694 /*
4695 * It does not make sense to show the first hit we happened
4696 * to have found. It does not make sense not to return with
4697 * exit code in such a case either.
4698 */
4699 if (options->flags.quick) {
4700 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4701 options->flags.exit_with_status = 1;
4702 }
4703
4704 options->diff_path_counter = 0;
4705
4706 if (options->flags.follow_renames && options->pathspec.nr != 1)
4707 die(_("--follow requires exactly one pathspec"));
4708
4709 if (!options->use_color || external_diff())
4710 options->color_moved = 0;
4711
4712 FREE_AND_NULL(options->parseopts);
4713 }
4714
4715 int parse_long_opt(const char *opt, const char **argv,
4716 const char **optarg)
4717 {
4718 const char *arg = argv[0];
4719 if (!skip_prefix(arg, "--", &arg))
4720 return 0;
4721 if (!skip_prefix(arg, opt, &arg))
4722 return 0;
4723 if (*arg == '=') { /* stuck form: --option=value */
4724 *optarg = arg + 1;
4725 return 1;
4726 }
4727 if (*arg != '\0')
4728 return 0;
4729 /* separate form: --option value */
4730 if (!argv[1])
4731 die("Option '--%s' requires a value", opt);
4732 *optarg = argv[1];
4733 return 2;
4734 }
4735
4736 static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4737 {
4738 struct diff_options *options = opt->value;
4739 int width = options->stat_width;
4740 int name_width = options->stat_name_width;
4741 int graph_width = options->stat_graph_width;
4742 int count = options->stat_count;
4743 char *end;
4744
4745 BUG_ON_OPT_NEG(unset);
4746
4747 if (!strcmp(opt->long_name, "stat")) {
4748 if (value) {
4749 width = strtoul(value, &end, 10);
4750 if (*end == ',')
4751 name_width = strtoul(end+1, &end, 10);
4752 if (*end == ',')
4753 count = strtoul(end+1, &end, 10);
4754 if (*end)
4755 return error(_("invalid --stat value: %s"), value);
4756 }
4757 } else if (!strcmp(opt->long_name, "stat-width")) {
4758 width = strtoul(value, &end, 10);
4759 if (*end)
4760 return error(_("%s expects a numerical value"),
4761 opt->long_name);
4762 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4763 name_width = strtoul(value, &end, 10);
4764 if (*end)
4765 return error(_("%s expects a numerical value"),
4766 opt->long_name);
4767 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4768 graph_width = strtoul(value, &end, 10);
4769 if (*end)
4770 return error(_("%s expects a numerical value"),
4771 opt->long_name);
4772 } else if (!strcmp(opt->long_name, "stat-count")) {
4773 count = strtoul(value, &end, 10);
4774 if (*end)
4775 return error(_("%s expects a numerical value"),
4776 opt->long_name);
4777 } else
4778 BUG("%s should not get here", opt->long_name);
4779
4780 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4781 options->stat_name_width = name_width;
4782 options->stat_graph_width = graph_width;
4783 options->stat_width = width;
4784 options->stat_count = count;
4785 return 0;
4786 }
4787
4788 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4789 {
4790 struct strbuf errmsg = STRBUF_INIT;
4791 if (parse_dirstat_params(options, params, &errmsg))
4792 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4793 errmsg.buf);
4794 strbuf_release(&errmsg);
4795 /*
4796 * The caller knows a dirstat-related option is given from the command
4797 * line; allow it to say "return this_function();"
4798 */
4799 options->output_format |= DIFF_FORMAT_DIRSTAT;
4800 return 1;
4801 }
4802
4803 static const char diff_status_letters[] = {
4804 DIFF_STATUS_ADDED,
4805 DIFF_STATUS_COPIED,
4806 DIFF_STATUS_DELETED,
4807 DIFF_STATUS_MODIFIED,
4808 DIFF_STATUS_RENAMED,
4809 DIFF_STATUS_TYPE_CHANGED,
4810 DIFF_STATUS_UNKNOWN,
4811 DIFF_STATUS_UNMERGED,
4812 DIFF_STATUS_FILTER_AON,
4813 DIFF_STATUS_FILTER_BROKEN,
4814 '\0',
4815 };
4816
4817 static unsigned int filter_bit['Z' + 1];
4818
4819 static void prepare_filter_bits(void)
4820 {
4821 int i;
4822
4823 if (!filter_bit[DIFF_STATUS_ADDED]) {
4824 for (i = 0; diff_status_letters[i]; i++)
4825 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4826 }
4827 }
4828
4829 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4830 {
4831 return opt->filter & filter_bit[(int) status];
4832 }
4833
4834 unsigned diff_filter_bit(char status)
4835 {
4836 prepare_filter_bits();
4837 return filter_bit[(int) status];
4838 }
4839
4840 static int diff_opt_diff_filter(const struct option *option,
4841 const char *optarg, int unset)
4842 {
4843 struct diff_options *opt = option->value;
4844 int i, optch;
4845
4846 BUG_ON_OPT_NEG(unset);
4847 prepare_filter_bits();
4848
4849 /*
4850 * If there is a negation e.g. 'd' in the input, and we haven't
4851 * initialized the filter field with another --diff-filter, start
4852 * from full set of bits, except for AON.
4853 */
4854 if (!opt->filter) {
4855 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4856 if (optch < 'a' || 'z' < optch)
4857 continue;
4858 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4859 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4860 break;
4861 }
4862 }
4863
4864 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4865 unsigned int bit;
4866 int negate;
4867
4868 if ('a' <= optch && optch <= 'z') {
4869 negate = 1;
4870 optch = toupper(optch);
4871 } else {
4872 negate = 0;
4873 }
4874
4875 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4876 if (!bit)
4877 return error(_("unknown change class '%c' in --diff-filter=%s"),
4878 optarg[i], optarg);
4879 if (negate)
4880 opt->filter &= ~bit;
4881 else
4882 opt->filter |= bit;
4883 }
4884 return 0;
4885 }
4886
4887 static void enable_patch_output(int *fmt)
4888 {
4889 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4890 *fmt |= DIFF_FORMAT_PATCH;
4891 }
4892
4893 static int diff_opt_ws_error_highlight(const struct option *option,
4894 const char *arg, int unset)
4895 {
4896 struct diff_options *opt = option->value;
4897 int val = parse_ws_error_highlight(arg);
4898
4899 BUG_ON_OPT_NEG(unset);
4900 if (val < 0)
4901 return error(_("unknown value after ws-error-highlight=%.*s"),
4902 -1 - val, arg);
4903 opt->ws_error_highlight = val;
4904 return 0;
4905 }
4906
4907 static int diff_opt_find_object(const struct option *option,
4908 const char *arg, int unset)
4909 {
4910 struct diff_options *opt = option->value;
4911 struct object_id oid;
4912
4913 BUG_ON_OPT_NEG(unset);
4914 if (get_oid(arg, &oid))
4915 return error(_("unable to resolve '%s'"), arg);
4916
4917 if (!opt->objfind)
4918 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4919
4920 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4921 opt->flags.recursive = 1;
4922 opt->flags.tree_in_recursive = 1;
4923 oidset_insert(opt->objfind, &oid);
4924 return 0;
4925 }
4926
4927 static int diff_opt_anchored(const struct option *opt,
4928 const char *arg, int unset)
4929 {
4930 struct diff_options *options = opt->value;
4931
4932 BUG_ON_OPT_NEG(unset);
4933 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4934 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4935 options->anchors_alloc);
4936 options->anchors[options->anchors_nr++] = xstrdup(arg);
4937 return 0;
4938 }
4939
4940 static int diff_opt_binary(const struct option *opt,
4941 const char *arg, int unset)
4942 {
4943 struct diff_options *options = opt->value;
4944
4945 BUG_ON_OPT_NEG(unset);
4946 BUG_ON_OPT_ARG(arg);
4947 enable_patch_output(&options->output_format);
4948 options->flags.binary = 1;
4949 return 0;
4950 }
4951
4952 static int diff_opt_break_rewrites(const struct option *opt,
4953 const char *arg, int unset)
4954 {
4955 int *break_opt = opt->value;
4956 int opt1, opt2;
4957
4958 BUG_ON_OPT_NEG(unset);
4959 if (!arg)
4960 arg = "";
4961 opt1 = parse_rename_score(&arg);
4962 if (*arg == 0)
4963 opt2 = 0;
4964 else if (*arg != '/')
4965 return error(_("%s expects <n>/<m> form"), opt->long_name);
4966 else {
4967 arg++;
4968 opt2 = parse_rename_score(&arg);
4969 }
4970 if (*arg != 0)
4971 return error(_("%s expects <n>/<m> form"), opt->long_name);
4972 *break_opt = opt1 | (opt2 << 16);
4973 return 0;
4974 }
4975
4976 static int diff_opt_char(const struct option *opt,
4977 const char *arg, int unset)
4978 {
4979 char *value = opt->value;
4980
4981 BUG_ON_OPT_NEG(unset);
4982 if (arg[1])
4983 return error(_("%s expects a character, got '%s'"),
4984 opt->long_name, arg);
4985 *value = arg[0];
4986 return 0;
4987 }
4988
4989 static int diff_opt_color_moved(const struct option *opt,
4990 const char *arg, int unset)
4991 {
4992 struct diff_options *options = opt->value;
4993
4994 if (unset) {
4995 options->color_moved = COLOR_MOVED_NO;
4996 } else if (!arg) {
4997 if (diff_color_moved_default)
4998 options->color_moved = diff_color_moved_default;
4999 if (options->color_moved == COLOR_MOVED_NO)
5000 options->color_moved = COLOR_MOVED_DEFAULT;
5001 } else {
5002 int cm = parse_color_moved(arg);
5003 if (cm < 0)
5004 return error(_("bad --color-moved argument: %s"), arg);
5005 options->color_moved = cm;
5006 }
5007 return 0;
5008 }
5009
5010 static int diff_opt_color_moved_ws(const struct option *opt,
5011 const char *arg, int unset)
5012 {
5013 struct diff_options *options = opt->value;
5014 unsigned cm;
5015
5016 if (unset) {
5017 options->color_moved_ws_handling = 0;
5018 return 0;
5019 }
5020
5021 cm = parse_color_moved_ws(arg);
5022 if (cm & COLOR_MOVED_WS_ERROR)
5023 return error(_("invalid mode '%s' in --color-moved-ws"), arg);
5024 options->color_moved_ws_handling = cm;
5025 return 0;
5026 }
5027
5028 static int diff_opt_color_words(const struct option *opt,
5029 const char *arg, int unset)
5030 {
5031 struct diff_options *options = opt->value;
5032
5033 BUG_ON_OPT_NEG(unset);
5034 options->use_color = 1;
5035 options->word_diff = DIFF_WORDS_COLOR;
5036 options->word_regex = arg;
5037 return 0;
5038 }
5039
5040 static int diff_opt_compact_summary(const struct option *opt,
5041 const char *arg, int unset)
5042 {
5043 struct diff_options *options = opt->value;
5044
5045 BUG_ON_OPT_ARG(arg);
5046 if (unset) {
5047 options->flags.stat_with_summary = 0;
5048 } else {
5049 options->flags.stat_with_summary = 1;
5050 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5051 }
5052 return 0;
5053 }
5054
5055 static int diff_opt_diff_algorithm(const struct option *opt,
5056 const char *arg, int unset)
5057 {
5058 struct diff_options *options = opt->value;
5059 long value = parse_algorithm_value(arg);
5060
5061 BUG_ON_OPT_NEG(unset);
5062 if (value < 0)
5063 return error(_("option diff-algorithm accepts \"myers\", "
5064 "\"minimal\", \"patience\" and \"histogram\""));
5065
5066 /* clear out previous settings */
5067 DIFF_XDL_CLR(options, NEED_MINIMAL);
5068 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5069 options->xdl_opts |= value;
5070 return 0;
5071 }
5072
5073 static int diff_opt_dirstat(const struct option *opt,
5074 const char *arg, int unset)
5075 {
5076 struct diff_options *options = opt->value;
5077
5078 BUG_ON_OPT_NEG(unset);
5079 if (!strcmp(opt->long_name, "cumulative")) {
5080 if (arg)
5081 BUG("how come --cumulative take a value?");
5082 arg = "cumulative";
5083 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
5084 parse_dirstat_opt(options, "files");
5085 parse_dirstat_opt(options, arg ? arg : "");
5086 return 0;
5087 }
5088
5089 static int diff_opt_find_copies(const struct option *opt,
5090 const char *arg, int unset)
5091 {
5092 struct diff_options *options = opt->value;
5093
5094 BUG_ON_OPT_NEG(unset);
5095 if (!arg)
5096 arg = "";
5097 options->rename_score = parse_rename_score(&arg);
5098 if (*arg != 0)
5099 return error(_("invalid argument to %s"), opt->long_name);
5100
5101 if (options->detect_rename == DIFF_DETECT_COPY)
5102 options->flags.find_copies_harder = 1;
5103 else
5104 options->detect_rename = DIFF_DETECT_COPY;
5105
5106 return 0;
5107 }
5108
5109 static int diff_opt_find_renames(const struct option *opt,
5110 const char *arg, int unset)
5111 {
5112 struct diff_options *options = opt->value;
5113
5114 BUG_ON_OPT_NEG(unset);
5115 if (!arg)
5116 arg = "";
5117 options->rename_score = parse_rename_score(&arg);
5118 if (*arg != 0)
5119 return error(_("invalid argument to %s"), opt->long_name);
5120
5121 options->detect_rename = DIFF_DETECT_RENAME;
5122 return 0;
5123 }
5124
5125 static int diff_opt_follow(const struct option *opt,
5126 const char *arg, int unset)
5127 {
5128 struct diff_options *options = opt->value;
5129
5130 BUG_ON_OPT_ARG(arg);
5131 if (unset) {
5132 options->flags.follow_renames = 0;
5133 options->flags.default_follow_renames = 0;
5134 } else {
5135 options->flags.follow_renames = 1;
5136 }
5137 return 0;
5138 }
5139
5140 static int diff_opt_ignore_submodules(const struct option *opt,
5141 const char *arg, int unset)
5142 {
5143 struct diff_options *options = opt->value;
5144
5145 BUG_ON_OPT_NEG(unset);
5146 if (!arg)
5147 arg = "all";
5148 options->flags.override_submodule_config = 1;
5149 handle_ignore_submodules_arg(options, arg);
5150 return 0;
5151 }
5152
5153 static int diff_opt_line_prefix(const struct option *opt,
5154 const char *optarg, int unset)
5155 {
5156 struct diff_options *options = opt->value;
5157
5158 BUG_ON_OPT_NEG(unset);
5159 options->line_prefix = optarg;
5160 options->line_prefix_length = strlen(options->line_prefix);
5161 graph_setup_line_prefix(options);
5162 return 0;
5163 }
5164
5165 static int diff_opt_no_prefix(const struct option *opt,
5166 const char *optarg, int unset)
5167 {
5168 struct diff_options *options = opt->value;
5169
5170 BUG_ON_OPT_NEG(unset);
5171 BUG_ON_OPT_ARG(optarg);
5172 options->a_prefix = "";
5173 options->b_prefix = "";
5174 return 0;
5175 }
5176
5177 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
5178 const struct option *opt,
5179 const char *arg, int unset)
5180 {
5181 struct diff_options *options = opt->value;
5182 char *path;
5183
5184 BUG_ON_OPT_NEG(unset);
5185 path = prefix_filename(ctx->prefix, arg);
5186 options->file = xfopen(path, "w");
5187 options->close_file = 1;
5188 if (options->use_color != GIT_COLOR_ALWAYS)
5189 options->use_color = GIT_COLOR_NEVER;
5190 free(path);
5191 return 0;
5192 }
5193
5194 static int diff_opt_patience(const struct option *opt,
5195 const char *arg, int unset)
5196 {
5197 struct diff_options *options = opt->value;
5198 int i;
5199
5200 BUG_ON_OPT_NEG(unset);
5201 BUG_ON_OPT_ARG(arg);
5202 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5203 /*
5204 * Both --patience and --anchored use PATIENCE_DIFF
5205 * internally, so remove any anchors previously
5206 * specified.
5207 */
5208 for (i = 0; i < options->anchors_nr; i++)
5209 free(options->anchors[i]);
5210 options->anchors_nr = 0;
5211 return 0;
5212 }
5213
5214 static int diff_opt_ignore_regex(const struct option *opt,
5215 const char *arg, int unset)
5216 {
5217 struct diff_options *options = opt->value;
5218 regex_t *regex;
5219
5220 BUG_ON_OPT_NEG(unset);
5221 regex = xmalloc(sizeof(*regex));
5222 if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE))
5223 return error(_("invalid regex given to -I: '%s'"), arg);
5224 ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1,
5225 options->ignore_regex_alloc);
5226 options->ignore_regex[options->ignore_regex_nr++] = regex;
5227 return 0;
5228 }
5229
5230 static int diff_opt_pickaxe_regex(const struct option *opt,
5231 const char *arg, int unset)
5232 {
5233 struct diff_options *options = opt->value;
5234
5235 BUG_ON_OPT_NEG(unset);
5236 options->pickaxe = arg;
5237 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5238 return 0;
5239 }
5240
5241 static int diff_opt_pickaxe_string(const struct option *opt,
5242 const char *arg, int unset)
5243 {
5244 struct diff_options *options = opt->value;
5245
5246 BUG_ON_OPT_NEG(unset);
5247 options->pickaxe = arg;
5248 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5249 return 0;
5250 }
5251
5252 static int diff_opt_relative(const struct option *opt,
5253 const char *arg, int unset)
5254 {
5255 struct diff_options *options = opt->value;
5256
5257 options->flags.relative_name = !unset;
5258 if (arg)
5259 options->prefix = arg;
5260 return 0;
5261 }
5262
5263 static int diff_opt_submodule(const struct option *opt,
5264 const char *arg, int unset)
5265 {
5266 struct diff_options *options = opt->value;
5267
5268 BUG_ON_OPT_NEG(unset);
5269 if (!arg)
5270 arg = "log";
5271 if (parse_submodule_params(options, arg))
5272 return error(_("failed to parse --submodule option parameter: '%s'"),
5273 arg);
5274 return 0;
5275 }
5276
5277 static int diff_opt_textconv(const struct option *opt,
5278 const char *arg, int unset)
5279 {
5280 struct diff_options *options = opt->value;
5281
5282 BUG_ON_OPT_ARG(arg);
5283 if (unset) {
5284 options->flags.allow_textconv = 0;
5285 } else {
5286 options->flags.allow_textconv = 1;
5287 options->flags.textconv_set_via_cmdline = 1;
5288 }
5289 return 0;
5290 }
5291
5292 static int diff_opt_unified(const struct option *opt,
5293 const char *arg, int unset)
5294 {
5295 struct diff_options *options = opt->value;
5296 char *s;
5297
5298 BUG_ON_OPT_NEG(unset);
5299
5300 if (arg) {
5301 options->context = strtol(arg, &s, 10);
5302 if (*s)
5303 return error(_("%s expects a numerical value"), "--unified");
5304 }
5305 enable_patch_output(&options->output_format);
5306
5307 return 0;
5308 }
5309
5310 static int diff_opt_word_diff(const struct option *opt,
5311 const char *arg, int unset)
5312 {
5313 struct diff_options *options = opt->value;
5314
5315 BUG_ON_OPT_NEG(unset);
5316 if (arg) {
5317 if (!strcmp(arg, "plain"))
5318 options->word_diff = DIFF_WORDS_PLAIN;
5319 else if (!strcmp(arg, "color")) {
5320 options->use_color = 1;
5321 options->word_diff = DIFF_WORDS_COLOR;
5322 }
5323 else if (!strcmp(arg, "porcelain"))
5324 options->word_diff = DIFF_WORDS_PORCELAIN;
5325 else if (!strcmp(arg, "none"))
5326 options->word_diff = DIFF_WORDS_NONE;
5327 else
5328 return error(_("bad --word-diff argument: %s"), arg);
5329 } else {
5330 if (options->word_diff == DIFF_WORDS_NONE)
5331 options->word_diff = DIFF_WORDS_PLAIN;
5332 }
5333 return 0;
5334 }
5335
5336 static int diff_opt_word_diff_regex(const struct option *opt,
5337 const char *arg, int unset)
5338 {
5339 struct diff_options *options = opt->value;
5340
5341 BUG_ON_OPT_NEG(unset);
5342 if (options->word_diff == DIFF_WORDS_NONE)
5343 options->word_diff = DIFF_WORDS_PLAIN;
5344 options->word_regex = arg;
5345 return 0;
5346 }
5347
5348 static void prep_parse_options(struct diff_options *options)
5349 {
5350 struct option parseopts[] = {
5351 OPT_GROUP(N_("Diff output format options")),
5352 OPT_BITOP('p', "patch", &options->output_format,
5353 N_("generate patch"),
5354 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5355 OPT_BIT_F('s', "no-patch", &options->output_format,
5356 N_("suppress diff output"),
5357 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
5358 OPT_BITOP('u', NULL, &options->output_format,
5359 N_("generate patch"),
5360 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5361 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
5362 N_("generate diffs with <n> lines context"),
5363 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
5364 OPT_BOOL('W', "function-context", &options->flags.funccontext,
5365 N_("generate diffs with <n> lines context")),
5366 OPT_BIT_F(0, "raw", &options->output_format,
5367 N_("generate the diff in raw format"),
5368 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
5369 OPT_BITOP(0, "patch-with-raw", &options->output_format,
5370 N_("synonym for '-p --raw'"),
5371 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
5372 DIFF_FORMAT_NO_OUTPUT),
5373 OPT_BITOP(0, "patch-with-stat", &options->output_format,
5374 N_("synonym for '-p --stat'"),
5375 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
5376 DIFF_FORMAT_NO_OUTPUT),
5377 OPT_BIT_F(0, "numstat", &options->output_format,
5378 N_("machine friendly --stat"),
5379 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
5380 OPT_BIT_F(0, "shortstat", &options->output_format,
5381 N_("output only the last line of --stat"),
5382 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
5383 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
5384 N_("output the distribution of relative amount of changes for each sub-directory"),
5385 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5386 diff_opt_dirstat),
5387 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5388 N_("synonym for --dirstat=cumulative"),
5389 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5390 diff_opt_dirstat),
5391 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5392 N_("synonym for --dirstat=files,param1,param2..."),
5393 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5394 diff_opt_dirstat),
5395 OPT_BIT_F(0, "check", &options->output_format,
5396 N_("warn if changes introduce conflict markers or whitespace errors"),
5397 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
5398 OPT_BIT_F(0, "summary", &options->output_format,
5399 N_("condensed summary such as creations, renames and mode changes"),
5400 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
5401 OPT_BIT_F(0, "name-only", &options->output_format,
5402 N_("show only names of changed files"),
5403 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
5404 OPT_BIT_F(0, "name-status", &options->output_format,
5405 N_("show only names and status of changed files"),
5406 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
5407 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5408 N_("generate diffstat"),
5409 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5410 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5411 N_("generate diffstat with a given width"),
5412 PARSE_OPT_NONEG, diff_opt_stat),
5413 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5414 N_("generate diffstat with a given name width"),
5415 PARSE_OPT_NONEG, diff_opt_stat),
5416 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5417 N_("generate diffstat with a given graph width"),
5418 PARSE_OPT_NONEG, diff_opt_stat),
5419 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5420 N_("generate diffstat with limited lines"),
5421 PARSE_OPT_NONEG, diff_opt_stat),
5422 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5423 N_("generate compact summary in diffstat"),
5424 PARSE_OPT_NOARG, diff_opt_compact_summary),
5425 OPT_CALLBACK_F(0, "binary", options, NULL,
5426 N_("output a binary diff that can be applied"),
5427 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
5428 OPT_BOOL(0, "full-index", &options->flags.full_index,
5429 N_("show full pre- and post-image object names on the \"index\" lines")),
5430 OPT_COLOR_FLAG(0, "color", &options->use_color,
5431 N_("show colored diff")),
5432 OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
5433 N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
5434 PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
5435 OPT_SET_INT('z', NULL, &options->line_termination,
5436 N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
5437 0),
5438 OPT__ABBREV(&options->abbrev),
5439 OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
5440 N_("show the given source prefix instead of \"a/\""),
5441 PARSE_OPT_NONEG),
5442 OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
5443 N_("show the given destination prefix instead of \"b/\""),
5444 PARSE_OPT_NONEG),
5445 OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
5446 N_("prepend an additional prefix to every line of output"),
5447 PARSE_OPT_NONEG, diff_opt_line_prefix),
5448 OPT_CALLBACK_F(0, "no-prefix", options, NULL,
5449 N_("do not show any source or destination prefix"),
5450 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
5451 OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
5452 N_("show context between diff hunks up to the specified number of lines"),
5453 PARSE_OPT_NONEG),
5454 OPT_CALLBACK_F(0, "output-indicator-new",
5455 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5456 N_("<char>"),
5457 N_("specify the character to indicate a new line instead of '+'"),
5458 PARSE_OPT_NONEG, diff_opt_char),
5459 OPT_CALLBACK_F(0, "output-indicator-old",
5460 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5461 N_("<char>"),
5462 N_("specify the character to indicate an old line instead of '-'"),
5463 PARSE_OPT_NONEG, diff_opt_char),
5464 OPT_CALLBACK_F(0, "output-indicator-context",
5465 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5466 N_("<char>"),
5467 N_("specify the character to indicate a context instead of ' '"),
5468 PARSE_OPT_NONEG, diff_opt_char),
5469
5470 OPT_GROUP(N_("Diff rename options")),
5471 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5472 N_("break complete rewrite changes into pairs of delete and create"),
5473 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5474 diff_opt_break_rewrites),
5475 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5476 N_("detect renames"),
5477 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5478 diff_opt_find_renames),
5479 OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
5480 N_("omit the preimage for deletes"),
5481 1, PARSE_OPT_NONEG),
5482 OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
5483 N_("detect copies"),
5484 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5485 diff_opt_find_copies),
5486 OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
5487 N_("use unmodified files as source to find copies")),
5488 OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
5489 N_("disable rename detection"),
5490 0, PARSE_OPT_NONEG),
5491 OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
5492 N_("use empty blobs as rename source")),
5493 OPT_CALLBACK_F(0, "follow", options, NULL,
5494 N_("continue listing the history of a file beyond renames"),
5495 PARSE_OPT_NOARG, diff_opt_follow),
5496 OPT_INTEGER('l', NULL, &options->rename_limit,
5497 N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
5498
5499 OPT_GROUP(N_("Diff algorithm options")),
5500 OPT_BIT(0, "minimal", &options->xdl_opts,
5501 N_("produce the smallest possible diff"),
5502 XDF_NEED_MINIMAL),
5503 OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
5504 N_("ignore whitespace when comparing lines"),
5505 XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
5506 OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
5507 N_("ignore changes in amount of whitespace"),
5508 XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
5509 OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
5510 N_("ignore changes in whitespace at EOL"),
5511 XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
5512 OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
5513 N_("ignore carrier-return at the end of line"),
5514 XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
5515 OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
5516 N_("ignore changes whose lines are all blank"),
5517 XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
5518 OPT_CALLBACK_F('I', "ignore-matching-lines", options, N_("<regex>"),
5519 N_("ignore changes whose all lines match <regex>"),
5520 0, diff_opt_ignore_regex),
5521 OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
5522 N_("heuristic to shift diff hunk boundaries for easy reading"),
5523 XDF_INDENT_HEURISTIC),
5524 OPT_CALLBACK_F(0, "patience", options, NULL,
5525 N_("generate diff using the \"patience diff\" algorithm"),
5526 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5527 diff_opt_patience),
5528 OPT_BITOP(0, "histogram", &options->xdl_opts,
5529 N_("generate diff using the \"histogram diff\" algorithm"),
5530 XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
5531 OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
5532 N_("choose a diff algorithm"),
5533 PARSE_OPT_NONEG, diff_opt_diff_algorithm),
5534 OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
5535 N_("generate diff using the \"anchored diff\" algorithm"),
5536 PARSE_OPT_NONEG, diff_opt_anchored),
5537 OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
5538 N_("show word diff, using <mode> to delimit changed words"),
5539 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
5540 OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
5541 N_("use <regex> to decide what a word is"),
5542 PARSE_OPT_NONEG, diff_opt_word_diff_regex),
5543 OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
5544 N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
5545 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
5546 OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
5547 N_("moved lines of code are colored differently"),
5548 PARSE_OPT_OPTARG, diff_opt_color_moved),
5549 OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
5550 N_("how white spaces are ignored in --color-moved"),
5551 0, diff_opt_color_moved_ws),
5552
5553 OPT_GROUP(N_("Other diff options")),
5554 OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
5555 N_("when run from subdir, exclude changes outside and show relative paths"),
5556 PARSE_OPT_OPTARG,
5557 diff_opt_relative),
5558 OPT_BOOL('a', "text", &options->flags.text,
5559 N_("treat all files as text")),
5560 OPT_BOOL('R', NULL, &options->flags.reverse_diff,
5561 N_("swap two inputs, reverse the diff")),
5562 OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
5563 N_("exit with 1 if there were differences, 0 otherwise")),
5564 OPT_BOOL(0, "quiet", &options->flags.quick,
5565 N_("disable all output of the program")),
5566 OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
5567 N_("allow an external diff helper to be executed")),
5568 OPT_CALLBACK_F(0, "textconv", options, NULL,
5569 N_("run external text conversion filters when comparing binary files"),
5570 PARSE_OPT_NOARG, diff_opt_textconv),
5571 OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
5572 N_("ignore changes to submodules in the diff generation"),
5573 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5574 diff_opt_ignore_submodules),
5575 OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
5576 N_("specify how differences in submodules are shown"),
5577 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5578 diff_opt_submodule),
5579 OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
5580 N_("hide 'git add -N' entries from the index"),
5581 1, PARSE_OPT_NONEG),
5582 OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
5583 N_("treat 'git add -N' entries as real in the index"),
5584 0, PARSE_OPT_NONEG),
5585 OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
5586 N_("look for differences that change the number of occurrences of the specified string"),
5587 0, diff_opt_pickaxe_string),
5588 OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
5589 N_("look for differences that change the number of occurrences of the specified regex"),
5590 0, diff_opt_pickaxe_regex),
5591 OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
5592 N_("show all changes in the changeset with -S or -G"),
5593 DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
5594 OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
5595 N_("treat <string> in -S as extended POSIX regular expression"),
5596 DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
5597 OPT_FILENAME('O', NULL, &options->orderfile,
5598 N_("control the order in which files appear in the output")),
5599 OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
5600 N_("look for differences that change the number of occurrences of the specified object"),
5601 PARSE_OPT_NONEG, diff_opt_find_object),
5602 OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
5603 N_("select files by diff type"),
5604 PARSE_OPT_NONEG, diff_opt_diff_filter),
5605 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5606 N_("Output to a specific file"),
5607 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5608
5609 OPT_END()
5610 };
5611
5612 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5613 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5614 }
5615
5616 int diff_opt_parse(struct diff_options *options,
5617 const char **av, int ac, const char *prefix)
5618 {
5619 if (!prefix)
5620 prefix = "";
5621
5622 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5623 PARSE_OPT_KEEP_DASHDASH |
5624 PARSE_OPT_KEEP_UNKNOWN |
5625 PARSE_OPT_NO_INTERNAL_HELP |
5626 PARSE_OPT_ONE_SHOT |
5627 PARSE_OPT_STOP_AT_NON_OPTION);
5628
5629 return ac;
5630 }
5631
5632 int parse_rename_score(const char **cp_p)
5633 {
5634 unsigned long num, scale;
5635 int ch, dot;
5636 const char *cp = *cp_p;
5637
5638 num = 0;
5639 scale = 1;
5640 dot = 0;
5641 for (;;) {
5642 ch = *cp;
5643 if ( !dot && ch == '.' ) {
5644 scale = 1;
5645 dot = 1;
5646 } else if ( ch == '%' ) {
5647 scale = dot ? scale*100 : 100;
5648 cp++; /* % is always at the end */
5649 break;
5650 } else if ( ch >= '0' && ch <= '9' ) {
5651 if ( scale < 100000 ) {
5652 scale *= 10;
5653 num = (num*10) + (ch-'0');
5654 }
5655 } else {
5656 break;
5657 }
5658 cp++;
5659 }
5660 *cp_p = cp;
5661
5662 /* user says num divided by scale and we say internally that
5663 * is MAX_SCORE * num / scale.
5664 */
5665 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5666 }
5667
5668 struct diff_queue_struct diff_queued_diff;
5669
5670 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5671 {
5672 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5673 queue->queue[queue->nr++] = dp;
5674 }
5675
5676 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5677 struct diff_filespec *one,
5678 struct diff_filespec *two)
5679 {
5680 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5681 dp->one = one;
5682 dp->two = two;
5683 if (queue)
5684 diff_q(queue, dp);
5685 return dp;
5686 }
5687
5688 void diff_free_filepair(struct diff_filepair *p)
5689 {
5690 free_filespec(p->one);
5691 free_filespec(p->two);
5692 free(p);
5693 }
5694
5695 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5696 {
5697 int abblen;
5698 const char *abbrev;
5699
5700 /* Do we want all 40 hex characters? */
5701 if (len == the_hash_algo->hexsz)
5702 return oid_to_hex(oid);
5703
5704 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5705 abbrev = diff_abbrev_oid(oid, len);
5706
5707 if (!print_sha1_ellipsis())
5708 return abbrev;
5709
5710 abblen = strlen(abbrev);
5711
5712 /*
5713 * In well-behaved cases, where the abbreviated result is the
5714 * same as the requested length, append three dots after the
5715 * abbreviation (hence the whole logic is limited to the case
5716 * where abblen < 37); when the actual abbreviated result is a
5717 * bit longer than the requested length, we reduce the number
5718 * of dots so that they match the well-behaved ones. However,
5719 * if the actual abbreviation is longer than the requested
5720 * length by more than three, we give up on aligning, and add
5721 * three dots anyway, to indicate that the output is not the
5722 * full object name. Yes, this may be suboptimal, but this
5723 * appears only in "diff --raw --abbrev" output and it is not
5724 * worth the effort to change it now. Note that this would
5725 * likely to work fine when the automatic sizing of default
5726 * abbreviation length is used--we would be fed -1 in "len" in
5727 * that case, and will end up always appending three-dots, but
5728 * the automatic sizing is supposed to give abblen that ensures
5729 * uniqueness across all objects (statistically speaking).
5730 */
5731 if (abblen < the_hash_algo->hexsz - 3) {
5732 static char hex[GIT_MAX_HEXSZ + 1];
5733 if (len < abblen && abblen <= len + 2)
5734 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5735 else
5736 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5737 return hex;
5738 }
5739
5740 return oid_to_hex(oid);
5741 }
5742
5743 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5744 {
5745 int line_termination = opt->line_termination;
5746 int inter_name_termination = line_termination ? '\t' : '\0';
5747
5748 fprintf(opt->file, "%s", diff_line_prefix(opt));
5749 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5750 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5751 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5752 fprintf(opt->file, "%s ",
5753 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5754 }
5755 if (p->score) {
5756 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5757 inter_name_termination);
5758 } else {
5759 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5760 }
5761
5762 if (p->status == DIFF_STATUS_COPIED ||
5763 p->status == DIFF_STATUS_RENAMED) {
5764 const char *name_a, *name_b;
5765 name_a = p->one->path;
5766 name_b = p->two->path;
5767 strip_prefix(opt->prefix_length, &name_a, &name_b);
5768 write_name_quoted(name_a, opt->file, inter_name_termination);
5769 write_name_quoted(name_b, opt->file, line_termination);
5770 } else {
5771 const char *name_a, *name_b;
5772 name_a = p->one->mode ? p->one->path : p->two->path;
5773 name_b = NULL;
5774 strip_prefix(opt->prefix_length, &name_a, &name_b);
5775 write_name_quoted(name_a, opt->file, line_termination);
5776 }
5777 }
5778
5779 int diff_unmodified_pair(struct diff_filepair *p)
5780 {
5781 /* This function is written stricter than necessary to support
5782 * the currently implemented transformers, but the idea is to
5783 * let transformers to produce diff_filepairs any way they want,
5784 * and filter and clean them up here before producing the output.
5785 */
5786 struct diff_filespec *one = p->one, *two = p->two;
5787
5788 if (DIFF_PAIR_UNMERGED(p))
5789 return 0; /* unmerged is interesting */
5790
5791 /* deletion, addition, mode or type change
5792 * and rename are all interesting.
5793 */
5794 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5795 DIFF_PAIR_MODE_CHANGED(p) ||
5796 strcmp(one->path, two->path))
5797 return 0;
5798
5799 /* both are valid and point at the same path. that is, we are
5800 * dealing with a change.
5801 */
5802 if (one->oid_valid && two->oid_valid &&
5803 oideq(&one->oid, &two->oid) &&
5804 !one->dirty_submodule && !two->dirty_submodule)
5805 return 1; /* no change */
5806 if (!one->oid_valid && !two->oid_valid)
5807 return 1; /* both look at the same file on the filesystem. */
5808 return 0;
5809 }
5810
5811 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5812 {
5813 if (diff_unmodified_pair(p))
5814 return;
5815
5816 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5817 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5818 return; /* no tree diffs in patch format */
5819
5820 run_diff(p, o);
5821 }
5822
5823 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5824 struct diffstat_t *diffstat)
5825 {
5826 if (diff_unmodified_pair(p))
5827 return;
5828
5829 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5830 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5831 return; /* no useful stat for tree diffs */
5832
5833 run_diffstat(p, o, diffstat);
5834 }
5835
5836 static void diff_flush_checkdiff(struct diff_filepair *p,
5837 struct diff_options *o)
5838 {
5839 if (diff_unmodified_pair(p))
5840 return;
5841
5842 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5843 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5844 return; /* nothing to check in tree diffs */
5845
5846 run_checkdiff(p, o);
5847 }
5848
5849 int diff_queue_is_empty(void)
5850 {
5851 struct diff_queue_struct *q = &diff_queued_diff;
5852 int i;
5853 for (i = 0; i < q->nr; i++)
5854 if (!diff_unmodified_pair(q->queue[i]))
5855 return 0;
5856 return 1;
5857 }
5858
5859 #if DIFF_DEBUG
5860 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5861 {
5862 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5863 x, one ? one : "",
5864 s->path,
5865 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5866 s->mode,
5867 s->oid_valid ? oid_to_hex(&s->oid) : "");
5868 fprintf(stderr, "queue[%d] %s size %lu\n",
5869 x, one ? one : "",
5870 s->size);
5871 }
5872
5873 void diff_debug_filepair(const struct diff_filepair *p, int i)
5874 {
5875 diff_debug_filespec(p->one, i, "one");
5876 diff_debug_filespec(p->two, i, "two");
5877 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5878 p->score, p->status ? p->status : '?',
5879 p->one->rename_used, p->broken_pair);
5880 }
5881
5882 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5883 {
5884 int i;
5885 if (msg)
5886 fprintf(stderr, "%s\n", msg);
5887 fprintf(stderr, "q->nr = %d\n", q->nr);
5888 for (i = 0; i < q->nr; i++) {
5889 struct diff_filepair *p = q->queue[i];
5890 diff_debug_filepair(p, i);
5891 }
5892 }
5893 #endif
5894
5895 static void diff_resolve_rename_copy(void)
5896 {
5897 int i;
5898 struct diff_filepair *p;
5899 struct diff_queue_struct *q = &diff_queued_diff;
5900
5901 diff_debug_queue("resolve-rename-copy", q);
5902
5903 for (i = 0; i < q->nr; i++) {
5904 p = q->queue[i];
5905 p->status = 0; /* undecided */
5906 if (DIFF_PAIR_UNMERGED(p))
5907 p->status = DIFF_STATUS_UNMERGED;
5908 else if (!DIFF_FILE_VALID(p->one))
5909 p->status = DIFF_STATUS_ADDED;
5910 else if (!DIFF_FILE_VALID(p->two))
5911 p->status = DIFF_STATUS_DELETED;
5912 else if (DIFF_PAIR_TYPE_CHANGED(p))
5913 p->status = DIFF_STATUS_TYPE_CHANGED;
5914
5915 /* from this point on, we are dealing with a pair
5916 * whose both sides are valid and of the same type, i.e.
5917 * either in-place edit or rename/copy edit.
5918 */
5919 else if (DIFF_PAIR_RENAME(p)) {
5920 /*
5921 * A rename might have re-connected a broken
5922 * pair up, causing the pathnames to be the
5923 * same again. If so, that's not a rename at
5924 * all, just a modification..
5925 *
5926 * Otherwise, see if this source was used for
5927 * multiple renames, in which case we decrement
5928 * the count, and call it a copy.
5929 */
5930 if (!strcmp(p->one->path, p->two->path))
5931 p->status = DIFF_STATUS_MODIFIED;
5932 else if (--p->one->rename_used > 0)
5933 p->status = DIFF_STATUS_COPIED;
5934 else
5935 p->status = DIFF_STATUS_RENAMED;
5936 }
5937 else if (!oideq(&p->one->oid, &p->two->oid) ||
5938 p->one->mode != p->two->mode ||
5939 p->one->dirty_submodule ||
5940 p->two->dirty_submodule ||
5941 is_null_oid(&p->one->oid))
5942 p->status = DIFF_STATUS_MODIFIED;
5943 else {
5944 /* This is a "no-change" entry and should not
5945 * happen anymore, but prepare for broken callers.
5946 */
5947 error("feeding unmodified %s to diffcore",
5948 p->one->path);
5949 p->status = DIFF_STATUS_UNKNOWN;
5950 }
5951 }
5952 diff_debug_queue("resolve-rename-copy done", q);
5953 }
5954
5955 static int check_pair_status(struct diff_filepair *p)
5956 {
5957 switch (p->status) {
5958 case DIFF_STATUS_UNKNOWN:
5959 return 0;
5960 case 0:
5961 die("internal error in diff-resolve-rename-copy");
5962 default:
5963 return 1;
5964 }
5965 }
5966
5967 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5968 {
5969 int fmt = opt->output_format;
5970
5971 if (fmt & DIFF_FORMAT_CHECKDIFF)
5972 diff_flush_checkdiff(p, opt);
5973 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5974 diff_flush_raw(p, opt);
5975 else if (fmt & DIFF_FORMAT_NAME) {
5976 const char *name_a, *name_b;
5977 name_a = p->two->path;
5978 name_b = NULL;
5979 strip_prefix(opt->prefix_length, &name_a, &name_b);
5980 fprintf(opt->file, "%s", diff_line_prefix(opt));
5981 write_name_quoted(name_a, opt->file, opt->line_termination);
5982 }
5983 }
5984
5985 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5986 {
5987 struct strbuf sb = STRBUF_INIT;
5988 if (fs->mode)
5989 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5990 else
5991 strbuf_addf(&sb, " %s ", newdelete);
5992
5993 quote_c_style(fs->path, &sb, NULL, 0);
5994 strbuf_addch(&sb, '\n');
5995 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5996 sb.buf, sb.len, 0);
5997 strbuf_release(&sb);
5998 }
5999
6000 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
6001 int show_name)
6002 {
6003 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
6004 struct strbuf sb = STRBUF_INIT;
6005 strbuf_addf(&sb, " mode change %06o => %06o",
6006 p->one->mode, p->two->mode);
6007 if (show_name) {
6008 strbuf_addch(&sb, ' ');
6009 quote_c_style(p->two->path, &sb, NULL, 0);
6010 }
6011 strbuf_addch(&sb, '\n');
6012 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6013 sb.buf, sb.len, 0);
6014 strbuf_release(&sb);
6015 }
6016 }
6017
6018 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
6019 struct diff_filepair *p)
6020 {
6021 struct strbuf sb = STRBUF_INIT;
6022 struct strbuf names = STRBUF_INIT;
6023
6024 pprint_rename(&names, p->one->path, p->two->path);
6025 strbuf_addf(&sb, " %s %s (%d%%)\n",
6026 renamecopy, names.buf, similarity_index(p));
6027 strbuf_release(&names);
6028 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6029 sb.buf, sb.len, 0);
6030 show_mode_change(opt, p, 0);
6031 strbuf_release(&sb);
6032 }
6033
6034 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
6035 {
6036 switch(p->status) {
6037 case DIFF_STATUS_DELETED:
6038 show_file_mode_name(opt, "delete", p->one);
6039 break;
6040 case DIFF_STATUS_ADDED:
6041 show_file_mode_name(opt, "create", p->two);
6042 break;
6043 case DIFF_STATUS_COPIED:
6044 show_rename_copy(opt, "copy", p);
6045 break;
6046 case DIFF_STATUS_RENAMED:
6047 show_rename_copy(opt, "rename", p);
6048 break;
6049 default:
6050 if (p->score) {
6051 struct strbuf sb = STRBUF_INIT;
6052 strbuf_addstr(&sb, " rewrite ");
6053 quote_c_style(p->two->path, &sb, NULL, 0);
6054 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
6055 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6056 sb.buf, sb.len, 0);
6057 strbuf_release(&sb);
6058 }
6059 show_mode_change(opt, p, !p->score);
6060 break;
6061 }
6062 }
6063
6064 struct patch_id_t {
6065 git_hash_ctx *ctx;
6066 int patchlen;
6067 };
6068
6069 static int remove_space(char *line, int len)
6070 {
6071 int i;
6072 char *dst = line;
6073 unsigned char c;
6074
6075 for (i = 0; i < len; i++)
6076 if (!isspace((c = line[i])))
6077 *dst++ = c;
6078
6079 return dst - line;
6080 }
6081
6082 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
6083 {
6084 unsigned char hash[GIT_MAX_RAWSZ];
6085 unsigned short carry = 0;
6086 int i;
6087
6088 the_hash_algo->final_fn(hash, ctx);
6089 the_hash_algo->init_fn(ctx);
6090 /* 20-byte sum, with carry */
6091 for (i = 0; i < the_hash_algo->rawsz; ++i) {
6092 carry += result->hash[i] + hash[i];
6093 result->hash[i] = carry;
6094 carry >>= 8;
6095 }
6096 }
6097
6098 static void patch_id_consume(void *priv, char *line, unsigned long len)
6099 {
6100 struct patch_id_t *data = priv;
6101 int new_len;
6102
6103 if (len > 12 && starts_with(line, "\\ "))
6104 return;
6105 new_len = remove_space(line, len);
6106
6107 the_hash_algo->update_fn(data->ctx, line, new_len);
6108 data->patchlen += new_len;
6109 }
6110
6111 static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
6112 {
6113 the_hash_algo->update_fn(ctx, str, strlen(str));
6114 }
6115
6116 static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
6117 {
6118 /* large enough for 2^32 in octal */
6119 char buf[12];
6120 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
6121 the_hash_algo->update_fn(ctx, buf, len);
6122 }
6123
6124 /* returns 0 upon success, and writes result into oid */
6125 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6126 {
6127 struct diff_queue_struct *q = &diff_queued_diff;
6128 int i;
6129 git_hash_ctx ctx;
6130 struct patch_id_t data;
6131
6132 the_hash_algo->init_fn(&ctx);
6133 memset(&data, 0, sizeof(struct patch_id_t));
6134 data.ctx = &ctx;
6135 oidclr(oid);
6136
6137 for (i = 0; i < q->nr; i++) {
6138 xpparam_t xpp;
6139 xdemitconf_t xecfg;
6140 mmfile_t mf1, mf2;
6141 struct diff_filepair *p = q->queue[i];
6142 int len1, len2;
6143
6144 memset(&xpp, 0, sizeof(xpp));
6145 memset(&xecfg, 0, sizeof(xecfg));
6146 if (p->status == 0)
6147 return error("internal diff status error");
6148 if (p->status == DIFF_STATUS_UNKNOWN)
6149 continue;
6150 if (diff_unmodified_pair(p))
6151 continue;
6152 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
6153 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
6154 continue;
6155 if (DIFF_PAIR_UNMERGED(p))
6156 continue;
6157
6158 diff_fill_oid_info(p->one, options->repo->index);
6159 diff_fill_oid_info(p->two, options->repo->index);
6160
6161 len1 = remove_space(p->one->path, strlen(p->one->path));
6162 len2 = remove_space(p->two->path, strlen(p->two->path));
6163 patch_id_add_string(&ctx, "diff--git");
6164 patch_id_add_string(&ctx, "a/");
6165 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6166 patch_id_add_string(&ctx, "b/");
6167 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6168
6169 if (p->one->mode == 0) {
6170 patch_id_add_string(&ctx, "newfilemode");
6171 patch_id_add_mode(&ctx, p->two->mode);
6172 patch_id_add_string(&ctx, "---/dev/null");
6173 patch_id_add_string(&ctx, "+++b/");
6174 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6175 } else if (p->two->mode == 0) {
6176 patch_id_add_string(&ctx, "deletedfilemode");
6177 patch_id_add_mode(&ctx, p->one->mode);
6178 patch_id_add_string(&ctx, "---a/");
6179 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6180 patch_id_add_string(&ctx, "+++/dev/null");
6181 } else {
6182 patch_id_add_string(&ctx, "---a/");
6183 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6184 patch_id_add_string(&ctx, "+++b/");
6185 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6186 }
6187
6188 if (diff_header_only)
6189 continue;
6190
6191 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
6192 fill_mmfile(options->repo, &mf2, p->two) < 0)
6193 return error("unable to read files to diff");
6194
6195 if (diff_filespec_is_binary(options->repo, p->one) ||
6196 diff_filespec_is_binary(options->repo, p->two)) {
6197 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
6198 the_hash_algo->hexsz);
6199 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
6200 the_hash_algo->hexsz);
6201 continue;
6202 }
6203
6204 xpp.flags = 0;
6205 xecfg.ctxlen = 3;
6206 xecfg.flags = 0;
6207 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
6208 patch_id_consume, &data, &xpp, &xecfg))
6209 return error("unable to generate patch-id diff for %s",
6210 p->one->path);
6211
6212 if (stable)
6213 flush_one_hunk(oid, &ctx);
6214 }
6215
6216 if (!stable)
6217 the_hash_algo->final_fn(oid->hash, &ctx);
6218
6219 return 0;
6220 }
6221
6222 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6223 {
6224 struct diff_queue_struct *q = &diff_queued_diff;
6225 int i;
6226 int result = diff_get_patch_id(options, oid, diff_header_only, stable);
6227
6228 for (i = 0; i < q->nr; i++)
6229 diff_free_filepair(q->queue[i]);
6230
6231 free(q->queue);
6232 DIFF_QUEUE_CLEAR(q);
6233
6234 return result;
6235 }
6236
6237 static int is_summary_empty(const struct diff_queue_struct *q)
6238 {
6239 int i;
6240
6241 for (i = 0; i < q->nr; i++) {
6242 const struct diff_filepair *p = q->queue[i];
6243
6244 switch (p->status) {
6245 case DIFF_STATUS_DELETED:
6246 case DIFF_STATUS_ADDED:
6247 case DIFF_STATUS_COPIED:
6248 case DIFF_STATUS_RENAMED:
6249 return 0;
6250 default:
6251 if (p->score)
6252 return 0;
6253 if (p->one->mode && p->two->mode &&
6254 p->one->mode != p->two->mode)
6255 return 0;
6256 break;
6257 }
6258 }
6259 return 1;
6260 }
6261
6262 static const char rename_limit_warning[] =
6263 N_("inexact rename detection was skipped due to too many files.");
6264
6265 static const char degrade_cc_to_c_warning[] =
6266 N_("only found copies from modified paths due to too many files.");
6267
6268 static const char rename_limit_advice[] =
6269 N_("you may want to set your %s variable to at least "
6270 "%d and retry the command.");
6271
6272 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
6273 {
6274 fflush(stdout);
6275 if (degraded_cc)
6276 warning(_(degrade_cc_to_c_warning));
6277 else if (needed)
6278 warning(_(rename_limit_warning));
6279 else
6280 return;
6281 if (0 < needed)
6282 warning(_(rename_limit_advice), varname, needed);
6283 }
6284
6285 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
6286 {
6287 int i;
6288 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
6289 struct diff_queue_struct *q = &diff_queued_diff;
6290
6291 if (WSEH_NEW & WS_RULE_MASK)
6292 BUG("WS rules bit mask overlaps with diff symbol flags");
6293
6294 if (o->color_moved)
6295 o->emitted_symbols = &esm;
6296
6297 for (i = 0; i < q->nr; i++) {
6298 struct diff_filepair *p = q->queue[i];
6299 if (check_pair_status(p))
6300 diff_flush_patch(p, o);
6301 }
6302
6303 if (o->emitted_symbols) {
6304 if (o->color_moved) {
6305 struct hashmap add_lines, del_lines;
6306
6307 if (o->color_moved_ws_handling &
6308 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
6309 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
6310
6311 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
6312 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
6313
6314 add_lines_to_move_detection(o, &add_lines, &del_lines);
6315 mark_color_as_moved(o, &add_lines, &del_lines);
6316 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6317 dim_moved_lines(o);
6318
6319 hashmap_clear_and_free(&add_lines, struct moved_entry,
6320 ent);
6321 hashmap_clear_and_free(&del_lines, struct moved_entry,
6322 ent);
6323 }
6324
6325 for (i = 0; i < esm.nr; i++)
6326 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6327
6328 for (i = 0; i < esm.nr; i++)
6329 free((void *)esm.buf[i].line);
6330 esm.nr = 0;
6331
6332 o->emitted_symbols = NULL;
6333 }
6334 }
6335
6336 void diff_flush(struct diff_options *options)
6337 {
6338 struct diff_queue_struct *q = &diff_queued_diff;
6339 int i, output_format = options->output_format;
6340 int separator = 0;
6341 int dirstat_by_line = 0;
6342
6343 /*
6344 * Order: raw, stat, summary, patch
6345 * or: name/name-status/checkdiff (other bits clear)
6346 */
6347 if (!q->nr)
6348 goto free_queue;
6349
6350 if (output_format & (DIFF_FORMAT_RAW |
6351 DIFF_FORMAT_NAME |
6352 DIFF_FORMAT_NAME_STATUS |
6353 DIFF_FORMAT_CHECKDIFF)) {
6354 for (i = 0; i < q->nr; i++) {
6355 struct diff_filepair *p = q->queue[i];
6356 if (check_pair_status(p))
6357 flush_one_pair(p, options);
6358 }
6359 separator++;
6360 }
6361
6362 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
6363 dirstat_by_line = 1;
6364
6365 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6366 dirstat_by_line) {
6367 struct diffstat_t diffstat;
6368
6369 compute_diffstat(options, &diffstat, q);
6370 if (output_format & DIFF_FORMAT_NUMSTAT)
6371 show_numstat(&diffstat, options);
6372 if (output_format & DIFF_FORMAT_DIFFSTAT)
6373 show_stats(&diffstat, options);
6374 if (output_format & DIFF_FORMAT_SHORTSTAT)
6375 show_shortstats(&diffstat, options);
6376 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
6377 show_dirstat_by_line(&diffstat, options);
6378 free_diffstat_info(&diffstat);
6379 separator++;
6380 }
6381 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
6382 show_dirstat(options);
6383
6384 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
6385 for (i = 0; i < q->nr; i++) {
6386 diff_summary(options, q->queue[i]);
6387 }
6388 separator++;
6389 }
6390
6391 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
6392 options->flags.exit_with_status &&
6393 options->flags.diff_from_contents) {
6394 /*
6395 * run diff_flush_patch for the exit status. setting
6396 * options->file to /dev/null should be safe, because we
6397 * aren't supposed to produce any output anyway.
6398 */
6399 if (options->close_file)
6400 fclose(options->file);
6401 options->file = xfopen("/dev/null", "w");
6402 options->close_file = 1;
6403 options->color_moved = 0;
6404 for (i = 0; i < q->nr; i++) {
6405 struct diff_filepair *p = q->queue[i];
6406 if (check_pair_status(p))
6407 diff_flush_patch(p, options);
6408 if (options->found_changes)
6409 break;
6410 }
6411 }
6412
6413 if (output_format & DIFF_FORMAT_PATCH) {
6414 if (separator) {
6415 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
6416 if (options->stat_sep)
6417 /* attach patch instead of inline */
6418 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6419 NULL, 0, 0);
6420 }
6421
6422 diff_flush_patch_all_file_pairs(options);
6423 }
6424
6425 if (output_format & DIFF_FORMAT_CALLBACK)
6426 options->format_callback(q, options, options->format_callback_data);
6427
6428 for (i = 0; i < q->nr; i++)
6429 diff_free_filepair(q->queue[i]);
6430 free_queue:
6431 free(q->queue);
6432 DIFF_QUEUE_CLEAR(q);
6433 if (options->close_file)
6434 fclose(options->file);
6435
6436 /*
6437 * Report the content-level differences with HAS_CHANGES;
6438 * diff_addremove/diff_change does not set the bit when
6439 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6440 */
6441 if (options->flags.diff_from_contents) {
6442 if (options->found_changes)
6443 options->flags.has_changes = 1;
6444 else
6445 options->flags.has_changes = 0;
6446 }
6447 }
6448
6449 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6450 {
6451 return (((p->status == DIFF_STATUS_MODIFIED) &&
6452 ((p->score &&
6453 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6454 (!p->score &&
6455 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6456 ((p->status != DIFF_STATUS_MODIFIED) &&
6457 filter_bit_tst(p->status, options)));
6458 }
6459
6460 static void diffcore_apply_filter(struct diff_options *options)
6461 {
6462 int i;
6463 struct diff_queue_struct *q = &diff_queued_diff;
6464 struct diff_queue_struct outq;
6465
6466 DIFF_QUEUE_CLEAR(&outq);
6467
6468 if (!options->filter)
6469 return;
6470
6471 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6472 int found;
6473 for (i = found = 0; !found && i < q->nr; i++) {
6474 if (match_filter(options, q->queue[i]))
6475 found++;
6476 }
6477 if (found)
6478 return;
6479
6480 /* otherwise we will clear the whole queue
6481 * by copying the empty outq at the end of this
6482 * function, but first clear the current entries
6483 * in the queue.
6484 */
6485 for (i = 0; i < q->nr; i++)
6486 diff_free_filepair(q->queue[i]);
6487 }
6488 else {
6489 /* Only the matching ones */
6490 for (i = 0; i < q->nr; i++) {
6491 struct diff_filepair *p = q->queue[i];
6492 if (match_filter(options, p))
6493 diff_q(&outq, p);
6494 else
6495 diff_free_filepair(p);
6496 }
6497 }
6498 free(q->queue);
6499 *q = outq;
6500 }
6501
6502 /* Check whether two filespecs with the same mode and size are identical */
6503 static int diff_filespec_is_identical(struct repository *r,
6504 struct diff_filespec *one,
6505 struct diff_filespec *two)
6506 {
6507 if (S_ISGITLINK(one->mode))
6508 return 0;
6509 if (diff_populate_filespec(r, one, NULL))
6510 return 0;
6511 if (diff_populate_filespec(r, two, NULL))
6512 return 0;
6513 return !memcmp(one->data, two->data, one->size);
6514 }
6515
6516 static int diff_filespec_check_stat_unmatch(struct repository *r,
6517 struct diff_filepair *p)
6518 {
6519 struct diff_populate_filespec_options dpf_options = {
6520 .check_size_only = 1,
6521 .missing_object_cb = diff_queued_diff_prefetch,
6522 .missing_object_data = r,
6523 };
6524
6525 if (p->done_skip_stat_unmatch)
6526 return p->skip_stat_unmatch_result;
6527
6528 p->done_skip_stat_unmatch = 1;
6529 p->skip_stat_unmatch_result = 0;
6530 /*
6531 * 1. Entries that come from stat info dirtiness
6532 * always have both sides (iow, not create/delete),
6533 * one side of the object name is unknown, with
6534 * the same mode and size. Keep the ones that
6535 * do not match these criteria. They have real
6536 * differences.
6537 *
6538 * 2. At this point, the file is known to be modified,
6539 * with the same mode and size, and the object
6540 * name of one side is unknown. Need to inspect
6541 * the identical contents.
6542 */
6543 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6544 !DIFF_FILE_VALID(p->two) ||
6545 (p->one->oid_valid && p->two->oid_valid) ||
6546 (p->one->mode != p->two->mode) ||
6547 diff_populate_filespec(r, p->one, &dpf_options) ||
6548 diff_populate_filespec(r, p->two, &dpf_options) ||
6549 (p->one->size != p->two->size) ||
6550 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6551 p->skip_stat_unmatch_result = 1;
6552 return p->skip_stat_unmatch_result;
6553 }
6554
6555 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6556 {
6557 int i;
6558 struct diff_queue_struct *q = &diff_queued_diff;
6559 struct diff_queue_struct outq;
6560 DIFF_QUEUE_CLEAR(&outq);
6561
6562 for (i = 0; i < q->nr; i++) {
6563 struct diff_filepair *p = q->queue[i];
6564
6565 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6566 diff_q(&outq, p);
6567 else {
6568 /*
6569 * The caller can subtract 1 from skip_stat_unmatch
6570 * to determine how many paths were dirty only
6571 * due to stat info mismatch.
6572 */
6573 if (!diffopt->flags.no_index)
6574 diffopt->skip_stat_unmatch++;
6575 diff_free_filepair(p);
6576 }
6577 }
6578 free(q->queue);
6579 *q = outq;
6580 }
6581
6582 static int diffnamecmp(const void *a_, const void *b_)
6583 {
6584 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6585 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6586 const char *name_a, *name_b;
6587
6588 name_a = a->one ? a->one->path : a->two->path;
6589 name_b = b->one ? b->one->path : b->two->path;
6590 return strcmp(name_a, name_b);
6591 }
6592
6593 void diffcore_fix_diff_index(void)
6594 {
6595 struct diff_queue_struct *q = &diff_queued_diff;
6596 QSORT(q->queue, q->nr, diffnamecmp);
6597 }
6598
6599 void diff_add_if_missing(struct repository *r,
6600 struct oid_array *to_fetch,
6601 const struct diff_filespec *filespec)
6602 {
6603 if (filespec && filespec->oid_valid &&
6604 !S_ISGITLINK(filespec->mode) &&
6605 oid_object_info_extended(r, &filespec->oid, NULL,
6606 OBJECT_INFO_FOR_PREFETCH))
6607 oid_array_append(to_fetch, &filespec->oid);
6608 }
6609
6610 void diff_queued_diff_prefetch(void *repository)
6611 {
6612 struct repository *repo = repository;
6613 int i;
6614 struct diff_queue_struct *q = &diff_queued_diff;
6615 struct oid_array to_fetch = OID_ARRAY_INIT;
6616
6617 for (i = 0; i < q->nr; i++) {
6618 struct diff_filepair *p = q->queue[i];
6619 diff_add_if_missing(repo, &to_fetch, p->one);
6620 diff_add_if_missing(repo, &to_fetch, p->two);
6621 }
6622
6623 /*
6624 * NEEDSWORK: Consider deduplicating the OIDs sent.
6625 */
6626 promisor_remote_get_direct(repo, to_fetch.oid, to_fetch.nr);
6627
6628 oid_array_clear(&to_fetch);
6629 }
6630
6631 void diffcore_std(struct diff_options *options)
6632 {
6633 int output_formats_to_prefetch = DIFF_FORMAT_DIFFSTAT |
6634 DIFF_FORMAT_NUMSTAT |
6635 DIFF_FORMAT_PATCH |
6636 DIFF_FORMAT_SHORTSTAT |
6637 DIFF_FORMAT_DIRSTAT;
6638
6639 /*
6640 * Check if the user requested a blob-data-requiring diff output and/or
6641 * break-rewrite detection (which requires blob data). If yes, prefetch
6642 * the diff pairs.
6643 *
6644 * If no prefetching occurs, diffcore_rename() will prefetch if it
6645 * decides that it needs inexact rename detection.
6646 */
6647 if (options->repo == the_repository && has_promisor_remote() &&
6648 (options->output_format & output_formats_to_prefetch ||
6649 options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
6650 diff_queued_diff_prefetch(options->repo);
6651
6652 /* NOTE please keep the following in sync with diff_tree_combined() */
6653 if (options->skip_stat_unmatch)
6654 diffcore_skip_stat_unmatch(options);
6655 if (!options->found_follow) {
6656 /* See try_to_follow_renames() in tree-diff.c */
6657 if (options->break_opt != -1)
6658 diffcore_break(options->repo,
6659 options->break_opt);
6660 if (options->detect_rename)
6661 diffcore_rename(options);
6662 if (options->break_opt != -1)
6663 diffcore_merge_broken();
6664 }
6665 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6666 diffcore_pickaxe(options);
6667 if (options->orderfile)
6668 diffcore_order(options->orderfile);
6669 if (!options->found_follow)
6670 /* See try_to_follow_renames() in tree-diff.c */
6671 diff_resolve_rename_copy();
6672 diffcore_apply_filter(options);
6673
6674 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6675 options->flags.has_changes = 1;
6676 else
6677 options->flags.has_changes = 0;
6678
6679 options->found_follow = 0;
6680 }
6681
6682 int diff_result_code(struct diff_options *opt, int status)
6683 {
6684 int result = 0;
6685
6686 diff_warn_rename_limit("diff.renameLimit",
6687 opt->needed_rename_limit,
6688 opt->degraded_cc_to_c);
6689 if (!opt->flags.exit_with_status &&
6690 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6691 return status;
6692 if (opt->flags.exit_with_status &&
6693 opt->flags.has_changes)
6694 result |= 01;
6695 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6696 opt->flags.check_failed)
6697 result |= 02;
6698 return result;
6699 }
6700
6701 int diff_can_quit_early(struct diff_options *opt)
6702 {
6703 return (opt->flags.quick &&
6704 !opt->filter &&
6705 opt->flags.has_changes);
6706 }
6707
6708 /*
6709 * Shall changes to this submodule be ignored?
6710 *
6711 * Submodule changes can be configured to be ignored separately for each path,
6712 * but that configuration can be overridden from the command line.
6713 */
6714 static int is_submodule_ignored(const char *path, struct diff_options *options)
6715 {
6716 int ignored = 0;
6717 struct diff_flags orig_flags = options->flags;
6718 if (!options->flags.override_submodule_config)
6719 set_diffopt_flags_from_submodule_config(options, path);
6720 if (options->flags.ignore_submodules)
6721 ignored = 1;
6722 options->flags = orig_flags;
6723 return ignored;
6724 }
6725
6726 void compute_diffstat(struct diff_options *options,
6727 struct diffstat_t *diffstat,
6728 struct diff_queue_struct *q)
6729 {
6730 int i;
6731
6732 memset(diffstat, 0, sizeof(struct diffstat_t));
6733 for (i = 0; i < q->nr; i++) {
6734 struct diff_filepair *p = q->queue[i];
6735 if (check_pair_status(p))
6736 diff_flush_stat(p, options, diffstat);
6737 }
6738 }
6739
6740 void diff_addremove(struct diff_options *options,
6741 int addremove, unsigned mode,
6742 const struct object_id *oid,
6743 int oid_valid,
6744 const char *concatpath, unsigned dirty_submodule)
6745 {
6746 struct diff_filespec *one, *two;
6747
6748 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6749 return;
6750
6751 /* This may look odd, but it is a preparation for
6752 * feeding "there are unchanged files which should
6753 * not produce diffs, but when you are doing copy
6754 * detection you would need them, so here they are"
6755 * entries to the diff-core. They will be prefixed
6756 * with something like '=' or '*' (I haven't decided
6757 * which but should not make any difference).
6758 * Feeding the same new and old to diff_change()
6759 * also has the same effect.
6760 * Before the final output happens, they are pruned after
6761 * merged into rename/copy pairs as appropriate.
6762 */
6763 if (options->flags.reverse_diff)
6764 addremove = (addremove == '+' ? '-' :
6765 addremove == '-' ? '+' : addremove);
6766
6767 if (options->prefix &&
6768 strncmp(concatpath, options->prefix, options->prefix_length))
6769 return;
6770
6771 one = alloc_filespec(concatpath);
6772 two = alloc_filespec(concatpath);
6773
6774 if (addremove != '+')
6775 fill_filespec(one, oid, oid_valid, mode);
6776 if (addremove != '-') {
6777 fill_filespec(two, oid, oid_valid, mode);
6778 two->dirty_submodule = dirty_submodule;
6779 }
6780
6781 diff_queue(&diff_queued_diff, one, two);
6782 if (!options->flags.diff_from_contents)
6783 options->flags.has_changes = 1;
6784 }
6785
6786 void diff_change(struct diff_options *options,
6787 unsigned old_mode, unsigned new_mode,
6788 const struct object_id *old_oid,
6789 const struct object_id *new_oid,
6790 int old_oid_valid, int new_oid_valid,
6791 const char *concatpath,
6792 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6793 {
6794 struct diff_filespec *one, *two;
6795 struct diff_filepair *p;
6796
6797 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6798 is_submodule_ignored(concatpath, options))
6799 return;
6800
6801 if (options->flags.reverse_diff) {
6802 SWAP(old_mode, new_mode);
6803 SWAP(old_oid, new_oid);
6804 SWAP(old_oid_valid, new_oid_valid);
6805 SWAP(old_dirty_submodule, new_dirty_submodule);
6806 }
6807
6808 if (options->prefix &&
6809 strncmp(concatpath, options->prefix, options->prefix_length))
6810 return;
6811
6812 one = alloc_filespec(concatpath);
6813 two = alloc_filespec(concatpath);
6814 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6815 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6816 one->dirty_submodule = old_dirty_submodule;
6817 two->dirty_submodule = new_dirty_submodule;
6818 p = diff_queue(&diff_queued_diff, one, two);
6819
6820 if (options->flags.diff_from_contents)
6821 return;
6822
6823 if (options->flags.quick && options->skip_stat_unmatch &&
6824 !diff_filespec_check_stat_unmatch(options->repo, p)) {
6825 diff_free_filespec_data(p->one);
6826 diff_free_filespec_data(p->two);
6827 return;
6828 }
6829
6830 options->flags.has_changes = 1;
6831 }
6832
6833 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6834 {
6835 struct diff_filepair *pair;
6836 struct diff_filespec *one, *two;
6837
6838 if (options->prefix &&
6839 strncmp(path, options->prefix, options->prefix_length))
6840 return NULL;
6841
6842 one = alloc_filespec(path);
6843 two = alloc_filespec(path);
6844 pair = diff_queue(&diff_queued_diff, one, two);
6845 pair->is_unmerged = 1;
6846 return pair;
6847 }
6848
6849 static char *run_textconv(struct repository *r,
6850 const char *pgm,
6851 struct diff_filespec *spec,
6852 size_t *outsize)
6853 {
6854 struct diff_tempfile *temp;
6855 const char *argv[3];
6856 const char **arg = argv;
6857 struct child_process child = CHILD_PROCESS_INIT;
6858 struct strbuf buf = STRBUF_INIT;
6859 int err = 0;
6860
6861 temp = prepare_temp_file(r, spec->path, spec);
6862 *arg++ = pgm;
6863 *arg++ = temp->name;
6864 *arg = NULL;
6865
6866 child.use_shell = 1;
6867 child.argv = argv;
6868 child.out = -1;
6869 if (start_command(&child)) {
6870 remove_tempfile();
6871 return NULL;
6872 }
6873
6874 if (strbuf_read(&buf, child.out, 0) < 0)
6875 err = error("error reading from textconv command '%s'", pgm);
6876 close(child.out);
6877
6878 if (finish_command(&child) || err) {
6879 strbuf_release(&buf);
6880 remove_tempfile();
6881 return NULL;
6882 }
6883 remove_tempfile();
6884
6885 return strbuf_detach(&buf, outsize);
6886 }
6887
6888 size_t fill_textconv(struct repository *r,
6889 struct userdiff_driver *driver,
6890 struct diff_filespec *df,
6891 char **outbuf)
6892 {
6893 size_t size;
6894
6895 if (!driver) {
6896 if (!DIFF_FILE_VALID(df)) {
6897 *outbuf = "";
6898 return 0;
6899 }
6900 if (diff_populate_filespec(r, df, NULL))
6901 die("unable to read files to diff");
6902 *outbuf = df->data;
6903 return df->size;
6904 }
6905
6906 if (!driver->textconv)
6907 BUG("fill_textconv called with non-textconv driver");
6908
6909 if (driver->textconv_cache && df->oid_valid) {
6910 *outbuf = notes_cache_get(driver->textconv_cache,
6911 &df->oid,
6912 &size);
6913 if (*outbuf)
6914 return size;
6915 }
6916
6917 *outbuf = run_textconv(r, driver->textconv, df, &size);
6918 if (!*outbuf)
6919 die("unable to read files to diff");
6920
6921 if (driver->textconv_cache && df->oid_valid) {
6922 /* ignore errors, as we might be in a readonly repository */
6923 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6924 size);
6925 /*
6926 * we could save up changes and flush them all at the end,
6927 * but we would need an extra call after all diffing is done.
6928 * Since generating a cache entry is the slow path anyway,
6929 * this extra overhead probably isn't a big deal.
6930 */
6931 notes_cache_write(driver->textconv_cache);
6932 }
6933
6934 return size;
6935 }
6936
6937 int textconv_object(struct repository *r,
6938 const char *path,
6939 unsigned mode,
6940 const struct object_id *oid,
6941 int oid_valid,
6942 char **buf,
6943 unsigned long *buf_size)
6944 {
6945 struct diff_filespec *df;
6946 struct userdiff_driver *textconv;
6947
6948 df = alloc_filespec(path);
6949 fill_filespec(df, oid, oid_valid, mode);
6950 textconv = get_textconv(r, df);
6951 if (!textconv) {
6952 free_filespec(df);
6953 return 0;
6954 }
6955
6956 *buf_size = fill_textconv(r, textconv, df, buf);
6957 free_filespec(df);
6958 return 1;
6959 }
6960
6961 void setup_diff_pager(struct diff_options *opt)
6962 {
6963 /*
6964 * If the user asked for our exit code, then either they want --quiet
6965 * or --exit-code. We should definitely not bother with a pager in the
6966 * former case, as we will generate no output. Since we still properly
6967 * report our exit code even when a pager is run, we _could_ run a
6968 * pager with --exit-code. But since we have not done so historically,
6969 * and because it is easy to find people oneline advising "git diff
6970 * --exit-code" in hooks and other scripts, we do not do so.
6971 */
6972 if (!opt->flags.exit_with_status &&
6973 check_pager_config("diff") != 0)
6974 setup_pager();
6975 }
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