?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'jx/pkt-line-doc-count-fix'
[git.git] / diff.c
blobd1ad6a3c4ad0bc5049d1af26ca0ea33fc9f68a1e
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "tempfile.h"
7 #include "quote.h"
8 #include "diff.h"
9 #include "diffcore.h"
10 #include "delta.h"
11 #include "xdiff-interface.h"
12 #include "color.h"
13 #include "attr.h"
14 #include "run-command.h"
15 #include "utf8.h"
16 #include "object-store.h"
17 #include "userdiff.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "hashmap.h"
21 #include "ll-merge.h"
22 #include "string-list.h"
23 #include "argv-array.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "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_stat_graph_width;
52 static int diff_dirstat_permille_default = 30;
53 static struct diff_options default_diff_options;
54 static long diff_algorithm;
55 static unsigned ws_error_highlight_default = WSEH_NEW;
56
57 static char diff_colors[][COLOR_MAXLEN] = {
58 GIT_COLOR_RESET,
59 GIT_COLOR_NORMAL, /* CONTEXT */
60 GIT_COLOR_BOLD, /* METAINFO */
61 GIT_COLOR_CYAN, /* FRAGINFO */
62 GIT_COLOR_RED, /* OLD */
63 GIT_COLOR_GREEN, /* NEW */
64 GIT_COLOR_YELLOW, /* COMMIT */
65 GIT_COLOR_BG_RED, /* WHITESPACE */
66 GIT_COLOR_NORMAL, /* FUNCINFO */
67 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
68 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
69 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
70 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
71 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
72 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
73 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
74 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
75 GIT_COLOR_FAINT, /* CONTEXT_DIM */
76 GIT_COLOR_FAINT_RED, /* OLD_DIM */
77 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
78 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
79 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
80 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
81 };
82
83 static const char *color_diff_slots[] = {
84 [DIFF_CONTEXT] = "context",
85 [DIFF_METAINFO] = "meta",
86 [DIFF_FRAGINFO] = "frag",
87 [DIFF_FILE_OLD] = "old",
88 [DIFF_FILE_NEW] = "new",
89 [DIFF_COMMIT] = "commit",
90 [DIFF_WHITESPACE] = "whitespace",
91 [DIFF_FUNCINFO] = "func",
92 [DIFF_FILE_OLD_MOVED] = "oldMoved",
93 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
94 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
95 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
96 [DIFF_FILE_NEW_MOVED] = "newMoved",
97 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
98 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
99 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
100 [DIFF_CONTEXT_DIM] = "contextDimmed",
101 [DIFF_FILE_OLD_DIM] = "oldDimmed",
102 [DIFF_FILE_NEW_DIM] = "newDimmed",
103 [DIFF_CONTEXT_BOLD] = "contextBold",
104 [DIFF_FILE_OLD_BOLD] = "oldBold",
105 [DIFF_FILE_NEW_BOLD] = "newBold",
106 };
107
108 define_list_config_array_extra(color_diff_slots, {"plain"});
109
110 static int parse_diff_color_slot(const char *var)
111 {
112 if (!strcasecmp(var, "plain"))
113 return DIFF_CONTEXT;
114 return LOOKUP_CONFIG(color_diff_slots, var);
115 }
116
117 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
118 struct strbuf *errmsg)
119 {
120 char *params_copy = xstrdup(params_string);
121 struct string_list params = STRING_LIST_INIT_NODUP;
122 int ret = 0;
123 int i;
124
125 if (*params_copy)
126 string_list_split_in_place(&params, params_copy, ',', -1);
127 for (i = 0; i < params.nr; i++) {
128 const char *p = params.items[i].string;
129 if (!strcmp(p, "changes")) {
130 options->flags.dirstat_by_line = 0;
131 options->flags.dirstat_by_file = 0;
132 } else if (!strcmp(p, "lines")) {
133 options->flags.dirstat_by_line = 1;
134 options->flags.dirstat_by_file = 0;
135 } else if (!strcmp(p, "files")) {
136 options->flags.dirstat_by_line = 0;
137 options->flags.dirstat_by_file = 1;
138 } else if (!strcmp(p, "noncumulative")) {
139 options->flags.dirstat_cumulative = 0;
140 } else if (!strcmp(p, "cumulative")) {
141 options->flags.dirstat_cumulative = 1;
142 } else if (isdigit(*p)) {
143 char *end;
144 int permille = strtoul(p, &end, 10) * 10;
145 if (*end == '.' && isdigit(*++end)) {
146 /* only use first digit */
147 permille += *end - '0';
148 /* .. and ignore any further digits */
149 while (isdigit(*++end))
150 ; /* nothing */
151 }
152 if (!*end)
153 options->dirstat_permille = permille;
154 else {
155 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
156 p);
157 ret++;
158 }
159 } else {
160 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
161 ret++;
162 }
163
164 }
165 string_list_clear(&params, 0);
166 free(params_copy);
167 return ret;
168 }
169
170 static int parse_submodule_params(struct diff_options *options, const char *value)
171 {
172 if (!strcmp(value, "log"))
173 options->submodule_format = DIFF_SUBMODULE_LOG;
174 else if (!strcmp(value, "short"))
175 options->submodule_format = DIFF_SUBMODULE_SHORT;
176 else if (!strcmp(value, "diff"))
177 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
178 /*
179 * Please update $__git_diff_submodule_formats in
180 * git-completion.bash when you add new formats.
181 */
182 else
183 return -1;
184 return 0;
185 }
186
187 int git_config_rename(const char *var, const char *value)
188 {
189 if (!value)
190 return DIFF_DETECT_RENAME;
191 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
192 return DIFF_DETECT_COPY;
193 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
194 }
195
196 long parse_algorithm_value(const char *value)
197 {
198 if (!value)
199 return -1;
200 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
201 return 0;
202 else if (!strcasecmp(value, "minimal"))
203 return XDF_NEED_MINIMAL;
204 else if (!strcasecmp(value, "patience"))
205 return XDF_PATIENCE_DIFF;
206 else if (!strcasecmp(value, "histogram"))
207 return XDF_HISTOGRAM_DIFF;
208 /*
209 * Please update $__git_diff_algorithms in git-completion.bash
210 * when you add new algorithms.
211 */
212 return -1;
213 }
214
215 static int parse_one_token(const char **arg, const char *token)
216 {
217 const char *rest;
218 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
219 *arg = rest;
220 return 1;
221 }
222 return 0;
223 }
224
225 static int parse_ws_error_highlight(const char *arg)
226 {
227 const char *orig_arg = arg;
228 unsigned val = 0;
229
230 while (*arg) {
231 if (parse_one_token(&arg, "none"))
232 val = 0;
233 else if (parse_one_token(&arg, "default"))
234 val = WSEH_NEW;
235 else if (parse_one_token(&arg, "all"))
236 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
237 else if (parse_one_token(&arg, "new"))
238 val |= WSEH_NEW;
239 else if (parse_one_token(&arg, "old"))
240 val |= WSEH_OLD;
241 else if (parse_one_token(&arg, "context"))
242 val |= WSEH_CONTEXT;
243 else {
244 return -1 - (int)(arg - orig_arg);
245 }
246 if (*arg)
247 arg++;
248 }
249 return val;
250 }
251
252 /*
253 * These are to give UI layer defaults.
254 * The core-level commands such as git-diff-files should
255 * never be affected by the setting of diff.renames
256 * the user happens to have in the configuration file.
257 */
258 void init_diff_ui_defaults(void)
259 {
260 diff_detect_rename_default = DIFF_DETECT_RENAME;
261 }
262
263 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
264 {
265 if (!strcmp(var, "diff.indentheuristic"))
266 diff_indent_heuristic = git_config_bool(var, value);
267 return 0;
268 }
269
270 static int parse_color_moved(const char *arg)
271 {
272 switch (git_parse_maybe_bool(arg)) {
273 case 0:
274 return COLOR_MOVED_NO;
275 case 1:
276 return COLOR_MOVED_DEFAULT;
277 default:
278 break;
279 }
280
281 if (!strcmp(arg, "no"))
282 return COLOR_MOVED_NO;
283 else if (!strcmp(arg, "plain"))
284 return COLOR_MOVED_PLAIN;
285 else if (!strcmp(arg, "blocks"))
286 return COLOR_MOVED_BLOCKS;
287 else if (!strcmp(arg, "zebra"))
288 return COLOR_MOVED_ZEBRA;
289 else if (!strcmp(arg, "default"))
290 return COLOR_MOVED_DEFAULT;
291 else if (!strcmp(arg, "dimmed-zebra"))
292 return COLOR_MOVED_ZEBRA_DIM;
293 else if (!strcmp(arg, "dimmed_zebra"))
294 return COLOR_MOVED_ZEBRA_DIM;
295 else
296 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
297 }
298
299 static unsigned parse_color_moved_ws(const char *arg)
300 {
301 int ret = 0;
302 struct string_list l = STRING_LIST_INIT_DUP;
303 struct string_list_item *i;
304
305 string_list_split(&l, arg, ',', -1);
306
307 for_each_string_list_item(i, &l) {
308 struct strbuf sb = STRBUF_INIT;
309 strbuf_addstr(&sb, i->string);
310 strbuf_trim(&sb);
311
312 if (!strcmp(sb.buf, "no"))
313 ret = 0;
314 else if (!strcmp(sb.buf, "ignore-space-change"))
315 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
316 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
317 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
318 else if (!strcmp(sb.buf, "ignore-all-space"))
319 ret |= XDF_IGNORE_WHITESPACE;
320 else if (!strcmp(sb.buf, "allow-indentation-change"))
321 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
322 else {
323 ret |= COLOR_MOVED_WS_ERROR;
324 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);
325 }
326
327 strbuf_release(&sb);
328 }
329
330 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
331 (ret & XDF_WHITESPACE_FLAGS)) {
332 error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
333 ret |= COLOR_MOVED_WS_ERROR;
334 }
335
336 string_list_clear(&l, 0);
337
338 return ret;
339 }
340
341 int git_diff_ui_config(const char *var, const char *value, void *cb)
342 {
343 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
344 diff_use_color_default = git_config_colorbool(var, value);
345 return 0;
346 }
347 if (!strcmp(var, "diff.colormoved")) {
348 int cm = parse_color_moved(value);
349 if (cm < 0)
350 return -1;
351 diff_color_moved_default = cm;
352 return 0;
353 }
354 if (!strcmp(var, "diff.colormovedws")) {
355 unsigned cm = parse_color_moved_ws(value);
356 if (cm & COLOR_MOVED_WS_ERROR)
357 return -1;
358 diff_color_moved_ws_default = cm;
359 return 0;
360 }
361 if (!strcmp(var, "diff.context")) {
362 diff_context_default = git_config_int(var, value);
363 if (diff_context_default < 0)
364 return -1;
365 return 0;
366 }
367 if (!strcmp(var, "diff.interhunkcontext")) {
368 diff_interhunk_context_default = git_config_int(var, value);
369 if (diff_interhunk_context_default < 0)
370 return -1;
371 return 0;
372 }
373 if (!strcmp(var, "diff.renames")) {
374 diff_detect_rename_default = git_config_rename(var, value);
375 return 0;
376 }
377 if (!strcmp(var, "diff.autorefreshindex")) {
378 diff_auto_refresh_index = git_config_bool(var, value);
379 return 0;
380 }
381 if (!strcmp(var, "diff.mnemonicprefix")) {
382 diff_mnemonic_prefix = git_config_bool(var, value);
383 return 0;
384 }
385 if (!strcmp(var, "diff.noprefix")) {
386 diff_no_prefix = git_config_bool(var, value);
387 return 0;
388 }
389 if (!strcmp(var, "diff.statgraphwidth")) {
390 diff_stat_graph_width = git_config_int(var, value);
391 return 0;
392 }
393 if (!strcmp(var, "diff.external"))
394 return git_config_string(&external_diff_cmd_cfg, var, value);
395 if (!strcmp(var, "diff.wordregex"))
396 return git_config_string(&diff_word_regex_cfg, var, value);
397 if (!strcmp(var, "diff.orderfile"))
398 return git_config_pathname(&diff_order_file_cfg, var, value);
399
400 if (!strcmp(var, "diff.ignoresubmodules"))
401 handle_ignore_submodules_arg(&default_diff_options, value);
402
403 if (!strcmp(var, "diff.submodule")) {
404 if (parse_submodule_params(&default_diff_options, value))
405 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
406 value);
407 return 0;
408 }
409
410 if (!strcmp(var, "diff.algorithm")) {
411 diff_algorithm = parse_algorithm_value(value);
412 if (diff_algorithm < 0)
413 return -1;
414 return 0;
415 }
416
417 if (git_color_config(var, value, cb) < 0)
418 return -1;
419
420 return git_diff_basic_config(var, value, cb);
421 }
422
423 int git_diff_basic_config(const char *var, const char *value, void *cb)
424 {
425 const char *name;
426
427 if (!strcmp(var, "diff.renamelimit")) {
428 diff_rename_limit_default = git_config_int(var, value);
429 return 0;
430 }
431
432 if (userdiff_config(var, value) < 0)
433 return -1;
434
435 if (skip_prefix(var, "diff.color.", &name) ||
436 skip_prefix(var, "color.diff.", &name)) {
437 int slot = parse_diff_color_slot(name);
438 if (slot < 0)
439 return 0;
440 if (!value)
441 return config_error_nonbool(var);
442 return color_parse(value, diff_colors[slot]);
443 }
444
445 if (!strcmp(var, "diff.wserrorhighlight")) {
446 int val = parse_ws_error_highlight(value);
447 if (val < 0)
448 return -1;
449 ws_error_highlight_default = val;
450 return 0;
451 }
452
453 /* like GNU diff's --suppress-blank-empty option */
454 if (!strcmp(var, "diff.suppressblankempty") ||
455 /* for backwards compatibility */
456 !strcmp(var, "diff.suppress-blank-empty")) {
457 diff_suppress_blank_empty = git_config_bool(var, value);
458 return 0;
459 }
460
461 if (!strcmp(var, "diff.dirstat")) {
462 struct strbuf errmsg = STRBUF_INIT;
463 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
464 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
465 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
466 errmsg.buf);
467 strbuf_release(&errmsg);
468 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
469 return 0;
470 }
471
472 if (git_diff_heuristic_config(var, value, cb) < 0)
473 return -1;
474
475 return git_default_config(var, value, cb);
476 }
477
478 static char *quote_two(const char *one, const char *two)
479 {
480 int need_one = quote_c_style(one, NULL, NULL, 1);
481 int need_two = quote_c_style(two, NULL, NULL, 1);
482 struct strbuf res = STRBUF_INIT;
483
484 if (need_one + need_two) {
485 strbuf_addch(&res, '"');
486 quote_c_style(one, &res, NULL, 1);
487 quote_c_style(two, &res, NULL, 1);
488 strbuf_addch(&res, '"');
489 } else {
490 strbuf_addstr(&res, one);
491 strbuf_addstr(&res, two);
492 }
493 return strbuf_detach(&res, NULL);
494 }
495
496 static const char *external_diff(void)
497 {
498 static const char *external_diff_cmd = NULL;
499 static int done_preparing = 0;
500
501 if (done_preparing)
502 return external_diff_cmd;
503 external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
504 if (!external_diff_cmd)
505 external_diff_cmd = external_diff_cmd_cfg;
506 done_preparing = 1;
507 return external_diff_cmd;
508 }
509
510 /*
511 * Keep track of files used for diffing. Sometimes such an entry
512 * refers to a temporary file, sometimes to an existing file, and
513 * sometimes to "/dev/null".
514 */
515 static struct diff_tempfile {
516 /*
517 * filename external diff should read from, or NULL if this
518 * entry is currently not in use:
519 */
520 const char *name;
521
522 char hex[GIT_MAX_HEXSZ + 1];
523 char mode[10];
524
525 /*
526 * If this diff_tempfile instance refers to a temporary file,
527 * this tempfile object is used to manage its lifetime.
528 */
529 struct tempfile *tempfile;
530 } diff_temp[2];
531
532 struct emit_callback {
533 int color_diff;
534 unsigned ws_rule;
535 int blank_at_eof_in_preimage;
536 int blank_at_eof_in_postimage;
537 int lno_in_preimage;
538 int lno_in_postimage;
539 const char **label_path;
540 struct diff_words_data *diff_words;
541 struct diff_options *opt;
542 struct strbuf *header;
543 };
544
545 static int count_lines(const char *data, int size)
546 {
547 int count, ch, completely_empty = 1, nl_just_seen = 0;
548 count = 0;
549 while (0 < size--) {
550 ch = *data++;
551 if (ch == '\n') {
552 count++;
553 nl_just_seen = 1;
554 completely_empty = 0;
555 }
556 else {
557 nl_just_seen = 0;
558 completely_empty = 0;
559 }
560 }
561 if (completely_empty)
562 return 0;
563 if (!nl_just_seen)
564 count++; /* no trailing newline */
565 return count;
566 }
567
568 static int fill_mmfile(struct repository *r, mmfile_t *mf,
569 struct diff_filespec *one)
570 {
571 if (!DIFF_FILE_VALID(one)) {
572 mf->ptr = (char *)""; /* does not matter */
573 mf->size = 0;
574 return 0;
575 }
576 else if (diff_populate_filespec(r, one, NULL))
577 return -1;
578
579 mf->ptr = one->data;
580 mf->size = one->size;
581 return 0;
582 }
583
584 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
585 static unsigned long diff_filespec_size(struct repository *r,
586 struct diff_filespec *one)
587 {
588 struct diff_populate_filespec_options dpf_options = {
589 .check_size_only = 1,
590 };
591
592 if (!DIFF_FILE_VALID(one))
593 return 0;
594 diff_populate_filespec(r, one, &dpf_options);
595 return one->size;
596 }
597
598 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
599 {
600 char *ptr = mf->ptr;
601 long size = mf->size;
602 int cnt = 0;
603
604 if (!size)
605 return cnt;
606 ptr += size - 1; /* pointing at the very end */
607 if (*ptr != '\n')
608 ; /* incomplete line */
609 else
610 ptr--; /* skip the last LF */
611 while (mf->ptr < ptr) {
612 char *prev_eol;
613 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
614 if (*prev_eol == '\n')
615 break;
616 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
617 break;
618 cnt++;
619 ptr = prev_eol - 1;
620 }
621 return cnt;
622 }
623
624 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
625 struct emit_callback *ecbdata)
626 {
627 int l1, l2, at;
628 unsigned ws_rule = ecbdata->ws_rule;
629 l1 = count_trailing_blank(mf1, ws_rule);
630 l2 = count_trailing_blank(mf2, ws_rule);
631 if (l2 <= l1) {
632 ecbdata->blank_at_eof_in_preimage = 0;
633 ecbdata->blank_at_eof_in_postimage = 0;
634 return;
635 }
636 at = count_lines(mf1->ptr, mf1->size);
637 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
638
639 at = count_lines(mf2->ptr, mf2->size);
640 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
641 }
642
643 static void emit_line_0(struct diff_options *o,
644 const char *set_sign, const char *set, unsigned reverse, const char *reset,
645 int first, const char *line, int len)
646 {
647 int has_trailing_newline, has_trailing_carriage_return;
648 int needs_reset = 0; /* at the end of the line */
649 FILE *file = o->file;
650
651 fputs(diff_line_prefix(o), file);
652
653 has_trailing_newline = (len > 0 && line[len-1] == '\n');
654 if (has_trailing_newline)
655 len--;
656
657 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
658 if (has_trailing_carriage_return)
659 len--;
660
661 if (!len && !first)
662 goto end_of_line;
663
664 if (reverse && want_color(o->use_color)) {
665 fputs(GIT_COLOR_REVERSE, file);
666 needs_reset = 1;
667 }
668
669 if (set_sign) {
670 fputs(set_sign, file);
671 needs_reset = 1;
672 }
673
674 if (first)
675 fputc(first, file);
676
677 if (!len)
678 goto end_of_line;
679
680 if (set) {
681 if (set_sign && set != set_sign)
682 fputs(reset, file);
683 fputs(set, file);
684 needs_reset = 1;
685 }
686 fwrite(line, len, 1, file);
687 needs_reset = 1; /* 'line' may contain color codes. */
688
689 end_of_line:
690 if (needs_reset)
691 fputs(reset, file);
692 if (has_trailing_carriage_return)
693 fputc('\r', file);
694 if (has_trailing_newline)
695 fputc('\n', file);
696 }
697
698 static void emit_line(struct diff_options *o, const char *set, const char *reset,
699 const char *line, int len)
700 {
701 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
702 }
703
704 enum diff_symbol {
705 DIFF_SYMBOL_BINARY_DIFF_HEADER,
706 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
707 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
708 DIFF_SYMBOL_BINARY_DIFF_BODY,
709 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
710 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
711 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
712 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
713 DIFF_SYMBOL_STATS_LINE,
714 DIFF_SYMBOL_WORD_DIFF,
715 DIFF_SYMBOL_STAT_SEP,
716 DIFF_SYMBOL_SUMMARY,
717 DIFF_SYMBOL_SUBMODULE_ADD,
718 DIFF_SYMBOL_SUBMODULE_DEL,
719 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
720 DIFF_SYMBOL_SUBMODULE_MODIFIED,
721 DIFF_SYMBOL_SUBMODULE_HEADER,
722 DIFF_SYMBOL_SUBMODULE_ERROR,
723 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
724 DIFF_SYMBOL_REWRITE_DIFF,
725 DIFF_SYMBOL_BINARY_FILES,
726 DIFF_SYMBOL_HEADER,
727 DIFF_SYMBOL_FILEPAIR_PLUS,
728 DIFF_SYMBOL_FILEPAIR_MINUS,
729 DIFF_SYMBOL_WORDS_PORCELAIN,
730 DIFF_SYMBOL_WORDS,
731 DIFF_SYMBOL_CONTEXT,
732 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
733 DIFF_SYMBOL_PLUS,
734 DIFF_SYMBOL_MINUS,
735 DIFF_SYMBOL_NO_LF_EOF,
736 DIFF_SYMBOL_CONTEXT_FRAGINFO,
737 DIFF_SYMBOL_CONTEXT_MARKER,
738 DIFF_SYMBOL_SEPARATOR
739 };
740 /*
741 * Flags for content lines:
742 * 0..12 are whitespace rules
743 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
744 * 16 is marking if the line is blank at EOF
745 */
746 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
747 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
748 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
749 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
750 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
751
752 /*
753 * This struct is used when we need to buffer the output of the diff output.
754 *
755 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
756 * into the pre/post image file. This pointer could be a union with the
757 * line pointer. By storing an offset into the file instead of the literal line,
758 * we can decrease the memory footprint for the buffered output. At first we
759 * may want to only have indirection for the content lines, but we could also
760 * enhance the state for emitting prefabricated lines, e.g. the similarity
761 * score line or hunk/file headers would only need to store a number or path
762 * and then the output can be constructed later on depending on state.
763 */
764 struct emitted_diff_symbol {
765 const char *line;
766 int len;
767 int flags;
768 int indent_off; /* Offset to first non-whitespace character */
769 int indent_width; /* The visual width of the indentation */
770 enum diff_symbol s;
771 };
772 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
773
774 struct emitted_diff_symbols {
775 struct emitted_diff_symbol *buf;
776 int nr, alloc;
777 };
778 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
779
780 static void append_emitted_diff_symbol(struct diff_options *o,
781 struct emitted_diff_symbol *e)
782 {
783 struct emitted_diff_symbol *f;
784
785 ALLOC_GROW(o->emitted_symbols->buf,
786 o->emitted_symbols->nr + 1,
787 o->emitted_symbols->alloc);
788 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
789
790 memcpy(f, e, sizeof(struct emitted_diff_symbol));
791 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
792 }
793
794 struct moved_entry {
795 struct hashmap_entry ent;
796 const struct emitted_diff_symbol *es;
797 struct moved_entry *next_line;
798 };
799
800 struct moved_block {
801 struct moved_entry *match;
802 int wsd; /* The whitespace delta of this block */
803 };
804
805 static void moved_block_clear(struct moved_block *b)
806 {
807 memset(b, 0, sizeof(*b));
808 }
809
810 #define INDENT_BLANKLINE INT_MIN
811
812 static void fill_es_indent_data(struct emitted_diff_symbol *es)
813 {
814 unsigned int off = 0, i;
815 int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
816 const char *s = es->line;
817 const int len = es->len;
818
819 /* skip any \v \f \r at start of indentation */
820 while (s[off] == '\f' || s[off] == '\v' ||
821 (s[off] == '\r' && off < len - 1))
822 off++;
823
824 /* calculate the visual width of indentation */
825 while(1) {
826 if (s[off] == ' ') {
827 width++;
828 off++;
829 } else if (s[off] == '\t') {
830 width += tab_width - (width % tab_width);
831 while (s[++off] == '\t')
832 width += tab_width;
833 } else {
834 break;
835 }
836 }
837
838 /* check if this line is blank */
839 for (i = off; i < len; i++)
840 if (!isspace(s[i]))
841 break;
842
843 if (i == len) {
844 es->indent_width = INDENT_BLANKLINE;
845 es->indent_off = len;
846 } else {
847 es->indent_off = off;
848 es->indent_width = width;
849 }
850 }
851
852 static int compute_ws_delta(const struct emitted_diff_symbol *a,
853 const struct emitted_diff_symbol *b,
854 int *out)
855 {
856 int a_len = a->len,
857 b_len = b->len,
858 a_off = a->indent_off,
859 a_width = a->indent_width,
860 b_off = b->indent_off,
861 b_width = b->indent_width;
862 int delta;
863
864 if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) {
865 *out = INDENT_BLANKLINE;
866 return 1;
867 }
868
869 if (a->s == DIFF_SYMBOL_PLUS)
870 delta = a_width - b_width;
871 else
872 delta = b_width - a_width;
873
874 if (a_len - a_off != b_len - b_off ||
875 memcmp(a->line + a_off, b->line + b_off, a_len - a_off))
876 return 0;
877
878 *out = delta;
879
880 return 1;
881 }
882
883 static int cmp_in_block_with_wsd(const struct diff_options *o,
884 const struct moved_entry *cur,
885 const struct moved_entry *match,
886 struct moved_block *pmb,
887 int n)
888 {
889 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
890 int al = cur->es->len, bl = match->es->len, cl = l->len;
891 const char *a = cur->es->line,
892 *b = match->es->line,
893 *c = l->line;
894 int a_off = cur->es->indent_off,
895 a_width = cur->es->indent_width,
896 c_off = l->indent_off,
897 c_width = l->indent_width;
898 int delta;
899
900 /*
901 * We need to check if 'cur' is equal to 'match'. As those
902 * are from the same (+/-) side, we do not need to adjust for
903 * indent changes. However these were found using fuzzy
904 * matching so we do have to check if they are equal. Here we
905 * just check the lengths. We delay calling memcmp() to check
906 * the contents until later as if the length comparison for a
907 * and c fails we can avoid the call all together.
908 */
909 if (al != bl)
910 return 1;
911
912 /* If 'l' and 'cur' are both blank then they match. */
913 if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE)
914 return 0;
915
916 /*
917 * The indent changes of the block are known and stored in pmb->wsd;
918 * however we need to check if the indent changes of the current line
919 * match those of the current block and that the text of 'l' and 'cur'
920 * after the indentation match.
921 */
922 if (cur->es->s == DIFF_SYMBOL_PLUS)
923 delta = a_width - c_width;
924 else
925 delta = c_width - a_width;
926
927 /*
928 * If the previous lines of this block were all blank then set its
929 * whitespace delta.
930 */
931 if (pmb->wsd == INDENT_BLANKLINE)
932 pmb->wsd = delta;
933
934 return !(delta == pmb->wsd && al - a_off == cl - c_off &&
935 !memcmp(a, b, al) && !
936 memcmp(a + a_off, c + c_off, al - a_off));
937 }
938
939 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
940 const struct hashmap_entry *eptr,
941 const struct hashmap_entry *entry_or_key,
942 const void *keydata)
943 {
944 const struct diff_options *diffopt = hashmap_cmp_fn_data;
945 const struct moved_entry *a, *b;
946 unsigned flags = diffopt->color_moved_ws_handling
947 & XDF_WHITESPACE_FLAGS;
948
949 a = container_of(eptr, const struct moved_entry, ent);
950 b = container_of(entry_or_key, const struct moved_entry, ent);
951
952 if (diffopt->color_moved_ws_handling &
953 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
954 /*
955 * As there is not specific white space config given,
956 * we'd need to check for a new block, so ignore all
957 * white space. The setup of the white space
958 * configuration for the next block is done else where
959 */
960 flags |= XDF_IGNORE_WHITESPACE;
961
962 return !xdiff_compare_lines(a->es->line, a->es->len,
963 b->es->line, b->es->len,
964 flags);
965 }
966
967 static struct moved_entry *prepare_entry(struct diff_options *o,
968 int line_no)
969 {
970 struct moved_entry *ret = xmalloc(sizeof(*ret));
971 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
972 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
973 unsigned int hash = xdiff_hash_string(l->line, l->len, flags);
974
975 hashmap_entry_init(&ret->ent, hash);
976 ret->es = l;
977 ret->next_line = NULL;
978
979 return ret;
980 }
981
982 static void add_lines_to_move_detection(struct diff_options *o,
983 struct hashmap *add_lines,
984 struct hashmap *del_lines)
985 {
986 struct moved_entry *prev_line = NULL;
987
988 int n;
989 for (n = 0; n < o->emitted_symbols->nr; n++) {
990 struct hashmap *hm;
991 struct moved_entry *key;
992
993 switch (o->emitted_symbols->buf[n].s) {
994 case DIFF_SYMBOL_PLUS:
995 hm = add_lines;
996 break;
997 case DIFF_SYMBOL_MINUS:
998 hm = del_lines;
999 break;
1000 default:
1001 prev_line = NULL;
1002 continue;
1003 }
1004
1005 if (o->color_moved_ws_handling &
1006 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1007 fill_es_indent_data(&o->emitted_symbols->buf[n]);
1008 key = prepare_entry(o, n);
1009 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
1010 prev_line->next_line = key;
1011
1012 hashmap_add(hm, &key->ent);
1013 prev_line = key;
1014 }
1015 }
1016
1017 static void pmb_advance_or_null(struct diff_options *o,
1018 struct moved_entry *match,
1019 struct hashmap *hm,
1020 struct moved_block *pmb,
1021 int pmb_nr)
1022 {
1023 int i;
1024 for (i = 0; i < pmb_nr; i++) {
1025 struct moved_entry *prev = pmb[i].match;
1026 struct moved_entry *cur = (prev && prev->next_line) ?
1027 prev->next_line : NULL;
1028 if (cur && !hm->cmpfn(o, &cur->ent, &match->ent, NULL)) {
1029 pmb[i].match = cur;
1030 } else {
1031 pmb[i].match = NULL;
1032 }
1033 }
1034 }
1035
1036 static void pmb_advance_or_null_multi_match(struct diff_options *o,
1037 struct moved_entry *match,
1038 struct hashmap *hm,
1039 struct moved_block *pmb,
1040 int pmb_nr, int n)
1041 {
1042 int i;
1043 char *got_match = xcalloc(1, pmb_nr);
1044
1045 hashmap_for_each_entry_from(hm, match, ent) {
1046 for (i = 0; i < pmb_nr; i++) {
1047 struct moved_entry *prev = pmb[i].match;
1048 struct moved_entry *cur = (prev && prev->next_line) ?
1049 prev->next_line : NULL;
1050 if (!cur)
1051 continue;
1052 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
1053 got_match[i] |= 1;
1054 }
1055 }
1056
1057 for (i = 0; i < pmb_nr; i++) {
1058 if (got_match[i]) {
1059 /* Advance to the next line */
1060 pmb[i].match = pmb[i].match->next_line;
1061 } else {
1062 moved_block_clear(&pmb[i]);
1063 }
1064 }
1065
1066 free(got_match);
1067 }
1068
1069 static int shrink_potential_moved_blocks(struct moved_block *pmb,
1070 int pmb_nr)
1071 {
1072 int lp, rp;
1073
1074 /* Shrink the set of potential block to the remaining running */
1075 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
1076 while (lp < pmb_nr && pmb[lp].match)
1077 lp++;
1078 /* lp points at the first NULL now */
1079
1080 while (rp > -1 && !pmb[rp].match)
1081 rp--;
1082 /* rp points at the last non-NULL */
1083
1084 if (lp < pmb_nr && rp > -1 && lp < rp) {
1085 pmb[lp] = pmb[rp];
1086 memset(&pmb[rp], 0, sizeof(pmb[rp]));
1087 rp--;
1088 lp++;
1089 }
1090 }
1091
1092 /* Remember the number of running sets */
1093 return rp + 1;
1094 }
1095
1096 /*
1097 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1098 *
1099 * Otherwise, if the last block has fewer alphanumeric characters than
1100 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1101 * that block.
1102 *
1103 * The last block consists of the (n - block_length)'th line up to but not
1104 * including the nth line.
1105 *
1106 * Returns 0 if the last block is empty or is unset by this function, non zero
1107 * otherwise.
1108 *
1109 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1110 * Think of a way to unify them.
1111 */
1112 static int adjust_last_block(struct diff_options *o, int n, int block_length)
1113 {
1114 int i, alnum_count = 0;
1115 if (o->color_moved == COLOR_MOVED_PLAIN)
1116 return block_length;
1117 for (i = 1; i < block_length + 1; i++) {
1118 const char *c = o->emitted_symbols->buf[n - i].line;
1119 for (; *c; c++) {
1120 if (!isalnum(*c))
1121 continue;
1122 alnum_count++;
1123 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1124 return 1;
1125 }
1126 }
1127 for (i = 1; i < block_length + 1; i++)
1128 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1129 return 0;
1130 }
1131
1132 /* Find blocks of moved code, delegate actual coloring decision to helper */
1133 static void mark_color_as_moved(struct diff_options *o,
1134 struct hashmap *add_lines,
1135 struct hashmap *del_lines)
1136 {
1137 struct moved_block *pmb = NULL; /* potentially moved blocks */
1138 int pmb_nr = 0, pmb_alloc = 0;
1139 int n, flipped_block = 0, block_length = 0;
1140
1141
1142 for (n = 0; n < o->emitted_symbols->nr; n++) {
1143 struct hashmap *hm = NULL;
1144 struct moved_entry *key;
1145 struct moved_entry *match = NULL;
1146 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1147 enum diff_symbol last_symbol = 0;
1148
1149 switch (l->s) {
1150 case DIFF_SYMBOL_PLUS:
1151 hm = del_lines;
1152 key = prepare_entry(o, n);
1153 match = hashmap_get_entry(hm, key, ent, NULL);
1154 free(key);
1155 break;
1156 case DIFF_SYMBOL_MINUS:
1157 hm = add_lines;
1158 key = prepare_entry(o, n);
1159 match = hashmap_get_entry(hm, key, ent, NULL);
1160 free(key);
1161 break;
1162 default:
1163 flipped_block = 0;
1164 }
1165
1166 if (!match) {
1167 int i;
1168
1169 adjust_last_block(o, n, block_length);
1170 for(i = 0; i < pmb_nr; i++)
1171 moved_block_clear(&pmb[i]);
1172 pmb_nr = 0;
1173 block_length = 0;
1174 flipped_block = 0;
1175 last_symbol = l->s;
1176 continue;
1177 }
1178
1179 if (o->color_moved == COLOR_MOVED_PLAIN) {
1180 last_symbol = l->s;
1181 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1182 continue;
1183 }
1184
1185 if (o->color_moved_ws_handling &
1186 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1187 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1188 else
1189 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1190
1191 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1192
1193 if (pmb_nr == 0) {
1194 /*
1195 * The current line is the start of a new block.
1196 * Setup the set of potential blocks.
1197 */
1198 hashmap_for_each_entry_from(hm, match, ent) {
1199 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1200 if (o->color_moved_ws_handling &
1201 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1202 if (compute_ws_delta(l, match->es,
1203 &pmb[pmb_nr].wsd))
1204 pmb[pmb_nr++].match = match;
1205 } else {
1206 pmb[pmb_nr].wsd = 0;
1207 pmb[pmb_nr++].match = match;
1208 }
1209 }
1210
1211 if (adjust_last_block(o, n, block_length) &&
1212 pmb_nr && last_symbol != l->s)
1213 flipped_block = (flipped_block + 1) % 2;
1214 else
1215 flipped_block = 0;
1216
1217 block_length = 0;
1218 }
1219
1220 if (pmb_nr) {
1221 block_length++;
1222 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1223 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1224 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1225 }
1226 last_symbol = l->s;
1227 }
1228 adjust_last_block(o, n, block_length);
1229
1230 for(n = 0; n < pmb_nr; n++)
1231 moved_block_clear(&pmb[n]);
1232 free(pmb);
1233 }
1234
1235 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1236 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1237 static void dim_moved_lines(struct diff_options *o)
1238 {
1239 int n;
1240 for (n = 0; n < o->emitted_symbols->nr; n++) {
1241 struct emitted_diff_symbol *prev = (n != 0) ?
1242 &o->emitted_symbols->buf[n - 1] : NULL;
1243 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1244 struct emitted_diff_symbol *next =
1245 (n < o->emitted_symbols->nr - 1) ?
1246 &o->emitted_symbols->buf[n + 1] : NULL;
1247
1248 /* Not a plus or minus line? */
1249 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1250 continue;
1251
1252 /* Not a moved line? */
1253 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1254 continue;
1255
1256 /*
1257 * If prev or next are not a plus or minus line,
1258 * pretend they don't exist
1259 */
1260 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1261 prev->s != DIFF_SYMBOL_MINUS)
1262 prev = NULL;
1263 if (next && next->s != DIFF_SYMBOL_PLUS &&
1264 next->s != DIFF_SYMBOL_MINUS)
1265 next = NULL;
1266
1267 /* Inside a block? */
1268 if ((prev &&
1269 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1270 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1271 (next &&
1272 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1273 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1274 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1275 continue;
1276 }
1277
1278 /* Check if we are at an interesting bound: */
1279 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1280 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1281 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1282 continue;
1283 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1284 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1285 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1286 continue;
1287
1288 /*
1289 * The boundary to prev and next are not interesting,
1290 * so this line is not interesting as a whole
1291 */
1292 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1293 }
1294 }
1295
1296 static void emit_line_ws_markup(struct diff_options *o,
1297 const char *set_sign, const char *set,
1298 const char *reset,
1299 int sign_index, const char *line, int len,
1300 unsigned ws_rule, int blank_at_eof)
1301 {
1302 const char *ws = NULL;
1303 int sign = o->output_indicators[sign_index];
1304
1305 if (o->ws_error_highlight & ws_rule) {
1306 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1307 if (!*ws)
1308 ws = NULL;
1309 }
1310
1311 if (!ws && !set_sign)
1312 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1313 else if (!ws) {
1314 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1315 } else if (blank_at_eof)
1316 /* Blank line at EOF - paint '+' as well */
1317 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1318 else {
1319 /* Emit just the prefix, then the rest. */
1320 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1321 sign, "", 0);
1322 ws_check_emit(line, len, ws_rule,
1323 o->file, set, reset, ws);
1324 }
1325 }
1326
1327 static void emit_diff_symbol_from_struct(struct diff_options *o,
1328 struct emitted_diff_symbol *eds)
1329 {
1330 static const char *nneof = " No newline at end of file\n";
1331 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1332 struct strbuf sb = STRBUF_INIT;
1333
1334 enum diff_symbol s = eds->s;
1335 const char *line = eds->line;
1336 int len = eds->len;
1337 unsigned flags = eds->flags;
1338
1339 switch (s) {
1340 case DIFF_SYMBOL_NO_LF_EOF:
1341 context = diff_get_color_opt(o, DIFF_CONTEXT);
1342 reset = diff_get_color_opt(o, DIFF_RESET);
1343 putc('\n', o->file);
1344 emit_line_0(o, context, NULL, 0, reset, '\\',
1345 nneof, strlen(nneof));
1346 break;
1347 case DIFF_SYMBOL_SUBMODULE_HEADER:
1348 case DIFF_SYMBOL_SUBMODULE_ERROR:
1349 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1350 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1351 case DIFF_SYMBOL_SUMMARY:
1352 case DIFF_SYMBOL_STATS_LINE:
1353 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1354 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1355 emit_line(o, "", "", line, len);
1356 break;
1357 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1358 case DIFF_SYMBOL_CONTEXT_MARKER:
1359 context = diff_get_color_opt(o, DIFF_CONTEXT);
1360 reset = diff_get_color_opt(o, DIFF_RESET);
1361 emit_line(o, context, reset, line, len);
1362 break;
1363 case DIFF_SYMBOL_SEPARATOR:
1364 fprintf(o->file, "%s%c",
1365 diff_line_prefix(o),
1366 o->line_termination);
1367 break;
1368 case DIFF_SYMBOL_CONTEXT:
1369 set = diff_get_color_opt(o, DIFF_CONTEXT);
1370 reset = diff_get_color_opt(o, DIFF_RESET);
1371 set_sign = NULL;
1372 if (o->flags.dual_color_diffed_diffs) {
1373 char c = !len ? 0 : line[0];
1374
1375 if (c == '+')
1376 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1377 else if (c == '@')
1378 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1379 else if (c == '-')
1380 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1381 }
1382 emit_line_ws_markup(o, set_sign, set, reset,
1383 OUTPUT_INDICATOR_CONTEXT, line, len,
1384 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1385 break;
1386 case DIFF_SYMBOL_PLUS:
1387 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1388 DIFF_SYMBOL_MOVED_LINE_ALT |
1389 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1390 case DIFF_SYMBOL_MOVED_LINE |
1391 DIFF_SYMBOL_MOVED_LINE_ALT |
1392 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1393 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1394 break;
1395 case DIFF_SYMBOL_MOVED_LINE |
1396 DIFF_SYMBOL_MOVED_LINE_ALT:
1397 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1398 break;
1399 case DIFF_SYMBOL_MOVED_LINE |
1400 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1401 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1402 break;
1403 case DIFF_SYMBOL_MOVED_LINE:
1404 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1405 break;
1406 default:
1407 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1408 }
1409 reset = diff_get_color_opt(o, DIFF_RESET);
1410 if (!o->flags.dual_color_diffed_diffs)
1411 set_sign = NULL;
1412 else {
1413 char c = !len ? 0 : line[0];
1414
1415 set_sign = set;
1416 if (c == '-')
1417 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1418 else if (c == '@')
1419 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1420 else if (c == '+')
1421 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1422 else
1423 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1424 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1425 }
1426 emit_line_ws_markup(o, set_sign, set, reset,
1427 OUTPUT_INDICATOR_NEW, line, len,
1428 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1429 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1430 break;
1431 case DIFF_SYMBOL_MINUS:
1432 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1433 DIFF_SYMBOL_MOVED_LINE_ALT |
1434 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1435 case DIFF_SYMBOL_MOVED_LINE |
1436 DIFF_SYMBOL_MOVED_LINE_ALT |
1437 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1438 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1439 break;
1440 case DIFF_SYMBOL_MOVED_LINE |
1441 DIFF_SYMBOL_MOVED_LINE_ALT:
1442 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1443 break;
1444 case DIFF_SYMBOL_MOVED_LINE |
1445 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1446 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1447 break;
1448 case DIFF_SYMBOL_MOVED_LINE:
1449 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1450 break;
1451 default:
1452 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1453 }
1454 reset = diff_get_color_opt(o, DIFF_RESET);
1455 if (!o->flags.dual_color_diffed_diffs)
1456 set_sign = NULL;
1457 else {
1458 char c = !len ? 0 : line[0];
1459
1460 set_sign = set;
1461 if (c == '+')
1462 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1463 else if (c == '@')
1464 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1465 else if (c == '-')
1466 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1467 else
1468 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1469 }
1470 emit_line_ws_markup(o, set_sign, set, reset,
1471 OUTPUT_INDICATOR_OLD, line, len,
1472 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1473 break;
1474 case DIFF_SYMBOL_WORDS_PORCELAIN:
1475 context = diff_get_color_opt(o, DIFF_CONTEXT);
1476 reset = diff_get_color_opt(o, DIFF_RESET);
1477 emit_line(o, context, reset, line, len);
1478 fputs("~\n", o->file);
1479 break;
1480 case DIFF_SYMBOL_WORDS:
1481 context = diff_get_color_opt(o, DIFF_CONTEXT);
1482 reset = diff_get_color_opt(o, DIFF_RESET);
1483 /*
1484 * Skip the prefix character, if any. With
1485 * diff_suppress_blank_empty, there may be
1486 * none.
1487 */
1488 if (line[0] != '\n') {
1489 line++;
1490 len--;
1491 }
1492 emit_line(o, context, reset, line, len);
1493 break;
1494 case DIFF_SYMBOL_FILEPAIR_PLUS:
1495 meta = diff_get_color_opt(o, DIFF_METAINFO);
1496 reset = diff_get_color_opt(o, DIFF_RESET);
1497 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1498 line, reset,
1499 strchr(line, ' ') ? "\t" : "");
1500 break;
1501 case DIFF_SYMBOL_FILEPAIR_MINUS:
1502 meta = diff_get_color_opt(o, DIFF_METAINFO);
1503 reset = diff_get_color_opt(o, DIFF_RESET);
1504 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1505 line, reset,
1506 strchr(line, ' ') ? "\t" : "");
1507 break;
1508 case DIFF_SYMBOL_BINARY_FILES:
1509 case DIFF_SYMBOL_HEADER:
1510 fprintf(o->file, "%s", line);
1511 break;
1512 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1513 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1514 break;
1515 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1516 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1517 break;
1518 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1519 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1520 break;
1521 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1522 fputs(diff_line_prefix(o), o->file);
1523 fputc('\n', o->file);
1524 break;
1525 case DIFF_SYMBOL_REWRITE_DIFF:
1526 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1527 reset = diff_get_color_opt(o, DIFF_RESET);
1528 emit_line(o, fraginfo, reset, line, len);
1529 break;
1530 case DIFF_SYMBOL_SUBMODULE_ADD:
1531 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1532 reset = diff_get_color_opt(o, DIFF_RESET);
1533 emit_line(o, set, reset, line, len);
1534 break;
1535 case DIFF_SYMBOL_SUBMODULE_DEL:
1536 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1537 reset = diff_get_color_opt(o, DIFF_RESET);
1538 emit_line(o, set, reset, line, len);
1539 break;
1540 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1541 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1542 diff_line_prefix(o), line);
1543 break;
1544 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1545 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1546 diff_line_prefix(o), line);
1547 break;
1548 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1549 emit_line(o, "", "", " 0 files changed\n",
1550 strlen(" 0 files changed\n"));
1551 break;
1552 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1553 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1554 break;
1555 case DIFF_SYMBOL_WORD_DIFF:
1556 fprintf(o->file, "%.*s", len, line);
1557 break;
1558 case DIFF_SYMBOL_STAT_SEP:
1559 fputs(o->stat_sep, o->file);
1560 break;
1561 default:
1562 BUG("unknown diff symbol");
1563 }
1564 strbuf_release(&sb);
1565 }
1566
1567 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1568 const char *line, int len, unsigned flags)
1569 {
1570 struct emitted_diff_symbol e = {line, len, flags, 0, 0, s};
1571
1572 if (o->emitted_symbols)
1573 append_emitted_diff_symbol(o, &e);
1574 else
1575 emit_diff_symbol_from_struct(o, &e);
1576 }
1577
1578 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1579 {
1580 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1581 }
1582
1583 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1584 {
1585 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1586 }
1587
1588 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1589 {
1590 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1591 path, strlen(path), 0);
1592 }
1593
1594 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1595 {
1596 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1597 path, strlen(path), 0);
1598 }
1599
1600 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1601 {
1602 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1603 header, strlen(header), 0);
1604 }
1605
1606 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1607 {
1608 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1609 }
1610
1611 void diff_emit_submodule_pipethrough(struct diff_options *o,
1612 const char *line, int len)
1613 {
1614 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1615 }
1616
1617 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1618 {
1619 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1620 ecbdata->blank_at_eof_in_preimage &&
1621 ecbdata->blank_at_eof_in_postimage &&
1622 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1623 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1624 return 0;
1625 return ws_blank_line(line, len, ecbdata->ws_rule);
1626 }
1627
1628 static void emit_add_line(struct emit_callback *ecbdata,
1629 const char *line, int len)
1630 {
1631 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1632 if (new_blank_line_at_eof(ecbdata, line, len))
1633 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1634
1635 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1636 }
1637
1638 static void emit_del_line(struct emit_callback *ecbdata,
1639 const char *line, int len)
1640 {
1641 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1642 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1643 }
1644
1645 static void emit_context_line(struct emit_callback *ecbdata,
1646 const char *line, int len)
1647 {
1648 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1649 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1650 }
1651
1652 static void emit_hunk_header(struct emit_callback *ecbdata,
1653 const char *line, int len)
1654 {
1655 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1656 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1657 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1658 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1659 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1660 static const char atat[2] = { '@', '@' };
1661 const char *cp, *ep;
1662 struct strbuf msgbuf = STRBUF_INIT;
1663 int org_len = len;
1664 int i = 1;
1665
1666 /*
1667 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1668 * it always is at least 10 bytes long.
1669 */
1670 if (len < 10 ||
1671 memcmp(line, atat, 2) ||
1672 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1673 emit_diff_symbol(ecbdata->opt,
1674 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1675 return;
1676 }
1677 ep += 2; /* skip over @@ */
1678
1679 /* The hunk header in fraginfo color */
1680 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1681 strbuf_addstr(&msgbuf, reverse);
1682 strbuf_addstr(&msgbuf, frag);
1683 if (ecbdata->opt->flags.suppress_hunk_header_line_count)
1684 strbuf_add(&msgbuf, atat, sizeof(atat));
1685 else
1686 strbuf_add(&msgbuf, line, ep - line);
1687 strbuf_addstr(&msgbuf, reset);
1688
1689 /*
1690 * trailing "\r\n"
1691 */
1692 for ( ; i < 3; i++)
1693 if (line[len - i] == '\r' || line[len - i] == '\n')
1694 len--;
1695
1696 /* blank before the func header */
1697 for (cp = ep; ep - line < len; ep++)
1698 if (*ep != ' ' && *ep != '\t')
1699 break;
1700 if (ep != cp) {
1701 strbuf_addstr(&msgbuf, context);
1702 strbuf_add(&msgbuf, cp, ep - cp);
1703 strbuf_addstr(&msgbuf, reset);
1704 }
1705
1706 if (ep < line + len) {
1707 strbuf_addstr(&msgbuf, func);
1708 strbuf_add(&msgbuf, ep, line + len - ep);
1709 strbuf_addstr(&msgbuf, reset);
1710 }
1711
1712 strbuf_add(&msgbuf, line + len, org_len - len);
1713 strbuf_complete_line(&msgbuf);
1714 emit_diff_symbol(ecbdata->opt,
1715 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1716 strbuf_release(&msgbuf);
1717 }
1718
1719 static struct diff_tempfile *claim_diff_tempfile(void)
1720 {
1721 int i;
1722 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1723 if (!diff_temp[i].name)
1724 return diff_temp + i;
1725 BUG("diff is failing to clean up its tempfiles");
1726 }
1727
1728 static void remove_tempfile(void)
1729 {
1730 int i;
1731 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1732 if (is_tempfile_active(diff_temp[i].tempfile))
1733 delete_tempfile(&diff_temp[i].tempfile);
1734 diff_temp[i].name = NULL;
1735 }
1736 }
1737
1738 static void add_line_count(struct strbuf *out, int count)
1739 {
1740 switch (count) {
1741 case 0:
1742 strbuf_addstr(out, "0,0");
1743 break;
1744 case 1:
1745 strbuf_addstr(out, "1");
1746 break;
1747 default:
1748 strbuf_addf(out, "1,%d", count);
1749 break;
1750 }
1751 }
1752
1753 static void emit_rewrite_lines(struct emit_callback *ecb,
1754 int prefix, const char *data, int size)
1755 {
1756 const char *endp = NULL;
1757
1758 while (0 < size) {
1759 int len;
1760
1761 endp = memchr(data, '\n', size);
1762 len = endp ? (endp - data + 1) : size;
1763 if (prefix != '+') {
1764 ecb->lno_in_preimage++;
1765 emit_del_line(ecb, data, len);
1766 } else {
1767 ecb->lno_in_postimage++;
1768 emit_add_line(ecb, data, len);
1769 }
1770 size -= len;
1771 data += len;
1772 }
1773 if (!endp)
1774 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1775 }
1776
1777 static void emit_rewrite_diff(const char *name_a,
1778 const char *name_b,
1779 struct diff_filespec *one,
1780 struct diff_filespec *two,
1781 struct userdiff_driver *textconv_one,
1782 struct userdiff_driver *textconv_two,
1783 struct diff_options *o)
1784 {
1785 int lc_a, lc_b;
1786 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1787 const char *a_prefix, *b_prefix;
1788 char *data_one, *data_two;
1789 size_t size_one, size_two;
1790 struct emit_callback ecbdata;
1791 struct strbuf out = STRBUF_INIT;
1792
1793 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1794 a_prefix = o->b_prefix;
1795 b_prefix = o->a_prefix;
1796 } else {
1797 a_prefix = o->a_prefix;
1798 b_prefix = o->b_prefix;
1799 }
1800
1801 name_a += (*name_a == '/');
1802 name_b += (*name_b == '/');
1803
1804 strbuf_reset(&a_name);
1805 strbuf_reset(&b_name);
1806 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1807 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1808
1809 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1810 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1811
1812 memset(&ecbdata, 0, sizeof(ecbdata));
1813 ecbdata.color_diff = want_color(o->use_color);
1814 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1815 ecbdata.opt = o;
1816 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1817 mmfile_t mf1, mf2;
1818 mf1.ptr = (char *)data_one;
1819 mf2.ptr = (char *)data_two;
1820 mf1.size = size_one;
1821 mf2.size = size_two;
1822 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1823 }
1824 ecbdata.lno_in_preimage = 1;
1825 ecbdata.lno_in_postimage = 1;
1826
1827 lc_a = count_lines(data_one, size_one);
1828 lc_b = count_lines(data_two, size_two);
1829
1830 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1831 a_name.buf, a_name.len, 0);
1832 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1833 b_name.buf, b_name.len, 0);
1834
1835 strbuf_addstr(&out, "@@ -");
1836 if (!o->irreversible_delete)
1837 add_line_count(&out, lc_a);
1838 else
1839 strbuf_addstr(&out, "?,?");
1840 strbuf_addstr(&out, " +");
1841 add_line_count(&out, lc_b);
1842 strbuf_addstr(&out, " @@\n");
1843 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1844 strbuf_release(&out);
1845
1846 if (lc_a && !o->irreversible_delete)
1847 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1848 if (lc_b)
1849 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1850 if (textconv_one)
1851 free((char *)data_one);
1852 if (textconv_two)
1853 free((char *)data_two);
1854 }
1855
1856 struct diff_words_buffer {
1857 mmfile_t text;
1858 unsigned long alloc;
1859 struct diff_words_orig {
1860 const char *begin, *end;
1861 } *orig;
1862 int orig_nr, orig_alloc;
1863 };
1864
1865 static void diff_words_append(char *line, unsigned long len,
1866 struct diff_words_buffer *buffer)
1867 {
1868 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1869 line++;
1870 len--;
1871 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1872 buffer->text.size += len;
1873 buffer->text.ptr[buffer->text.size] = '\0';
1874 }
1875
1876 struct diff_words_style_elem {
1877 const char *prefix;
1878 const char *suffix;
1879 const char *color; /* NULL; filled in by the setup code if
1880 * color is enabled */
1881 };
1882
1883 struct diff_words_style {
1884 enum diff_words_type type;
1885 struct diff_words_style_elem new_word, old_word, ctx;
1886 const char *newline;
1887 };
1888
1889 static struct diff_words_style diff_words_styles[] = {
1890 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1891 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1892 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1893 };
1894
1895 struct diff_words_data {
1896 struct diff_words_buffer minus, plus;
1897 const char *current_plus;
1898 int last_minus;
1899 struct diff_options *opt;
1900 regex_t *word_regex;
1901 enum diff_words_type type;
1902 struct diff_words_style *style;
1903 };
1904
1905 static int fn_out_diff_words_write_helper(struct diff_options *o,
1906 struct diff_words_style_elem *st_el,
1907 const char *newline,
1908 size_t count, const char *buf)
1909 {
1910 int print = 0;
1911 struct strbuf sb = STRBUF_INIT;
1912
1913 while (count) {
1914 char *p = memchr(buf, '\n', count);
1915 if (print)
1916 strbuf_addstr(&sb, diff_line_prefix(o));
1917
1918 if (p != buf) {
1919 const char *reset = st_el->color && *st_el->color ?
1920 GIT_COLOR_RESET : NULL;
1921 if (st_el->color && *st_el->color)
1922 strbuf_addstr(&sb, st_el->color);
1923 strbuf_addstr(&sb, st_el->prefix);
1924 strbuf_add(&sb, buf, p ? p - buf : count);
1925 strbuf_addstr(&sb, st_el->suffix);
1926 if (reset)
1927 strbuf_addstr(&sb, reset);
1928 }
1929 if (!p)
1930 goto out;
1931
1932 strbuf_addstr(&sb, newline);
1933 count -= p + 1 - buf;
1934 buf = p + 1;
1935 print = 1;
1936 if (count) {
1937 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1938 sb.buf, sb.len, 0);
1939 strbuf_reset(&sb);
1940 }
1941 }
1942
1943 out:
1944 if (sb.len)
1945 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1946 sb.buf, sb.len, 0);
1947 strbuf_release(&sb);
1948 return 0;
1949 }
1950
1951 /*
1952 * '--color-words' algorithm can be described as:
1953 *
1954 * 1. collect the minus/plus lines of a diff hunk, divided into
1955 * minus-lines and plus-lines;
1956 *
1957 * 2. break both minus-lines and plus-lines into words and
1958 * place them into two mmfile_t with one word for each line;
1959 *
1960 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1961 *
1962 * And for the common parts of the both file, we output the plus side text.
1963 * diff_words->current_plus is used to trace the current position of the plus file
1964 * which printed. diff_words->last_minus is used to trace the last minus word
1965 * printed.
1966 *
1967 * For '--graph' to work with '--color-words', we need to output the graph prefix
1968 * on each line of color words output. Generally, there are two conditions on
1969 * which we should output the prefix.
1970 *
1971 * 1. diff_words->last_minus == 0 &&
1972 * diff_words->current_plus == diff_words->plus.text.ptr
1973 *
1974 * that is: the plus text must start as a new line, and if there is no minus
1975 * word printed, a graph prefix must be printed.
1976 *
1977 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1978 * *(diff_words->current_plus - 1) == '\n'
1979 *
1980 * that is: a graph prefix must be printed following a '\n'
1981 */
1982 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1983 {
1984 if ((diff_words->last_minus == 0 &&
1985 diff_words->current_plus == diff_words->plus.text.ptr) ||
1986 (diff_words->current_plus > diff_words->plus.text.ptr &&
1987 *(diff_words->current_plus - 1) == '\n')) {
1988 return 1;
1989 } else {
1990 return 0;
1991 }
1992 }
1993
1994 static void fn_out_diff_words_aux(void *priv,
1995 long minus_first, long minus_len,
1996 long plus_first, long plus_len,
1997 const char *func, long funclen)
1998 {
1999 struct diff_words_data *diff_words = priv;
2000 struct diff_words_style *style = diff_words->style;
2001 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
2002 struct diff_options *opt = diff_words->opt;
2003 const char *line_prefix;
2004
2005 assert(opt);
2006 line_prefix = diff_line_prefix(opt);
2007
2008 /* POSIX requires that first be decremented by one if len == 0... */
2009 if (minus_len) {
2010 minus_begin = diff_words->minus.orig[minus_first].begin;
2011 minus_end =
2012 diff_words->minus.orig[minus_first + minus_len - 1].end;
2013 } else
2014 minus_begin = minus_end =
2015 diff_words->minus.orig[minus_first].end;
2016
2017 if (plus_len) {
2018 plus_begin = diff_words->plus.orig[plus_first].begin;
2019 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
2020 } else
2021 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
2022
2023 if (color_words_output_graph_prefix(diff_words)) {
2024 fputs(line_prefix, diff_words->opt->file);
2025 }
2026 if (diff_words->current_plus != plus_begin) {
2027 fn_out_diff_words_write_helper(diff_words->opt,
2028 &style->ctx, style->newline,
2029 plus_begin - diff_words->current_plus,
2030 diff_words->current_plus);
2031 }
2032 if (minus_begin != minus_end) {
2033 fn_out_diff_words_write_helper(diff_words->opt,
2034 &style->old_word, style->newline,
2035 minus_end - minus_begin, minus_begin);
2036 }
2037 if (plus_begin != plus_end) {
2038 fn_out_diff_words_write_helper(diff_words->opt,
2039 &style->new_word, style->newline,
2040 plus_end - plus_begin, plus_begin);
2041 }
2042
2043 diff_words->current_plus = plus_end;
2044 diff_words->last_minus = minus_first;
2045 }
2046
2047 /* This function starts looking at *begin, and returns 0 iff a word was found. */
2048 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
2049 int *begin, int *end)
2050 {
2051 if (word_regex && *begin < buffer->size) {
2052 regmatch_t match[1];
2053 if (!regexec_buf(word_regex, buffer->ptr + *begin,
2054 buffer->size - *begin, 1, match, 0)) {
2055 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
2056 '\n', match[0].rm_eo - match[0].rm_so);
2057 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
2058 *begin += match[0].rm_so;
2059 return *begin >= *end;
2060 }
2061 return -1;
2062 }
2063
2064 /* find the next word */
2065 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2066 (*begin)++;
2067 if (*begin >= buffer->size)
2068 return -1;
2069
2070 /* find the end of the word */
2071 *end = *begin + 1;
2072 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2073 (*end)++;
2074
2075 return 0;
2076 }
2077
2078 /*
2079 * This function splits the words in buffer->text, stores the list with
2080 * newline separator into out, and saves the offsets of the original words
2081 * in buffer->orig.
2082 */
2083 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2084 regex_t *word_regex)
2085 {
2086 int i, j;
2087 long alloc = 0;
2088
2089 out->size = 0;
2090 out->ptr = NULL;
2091
2092 /* fake an empty "0th" word */
2093 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2094 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2095 buffer->orig_nr = 1;
2096
2097 for (i = 0; i < buffer->text.size; i++) {
2098 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2099 return;
2100
2101 /* store original boundaries */
2102 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2103 buffer->orig_alloc);
2104 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2105 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2106 buffer->orig_nr++;
2107
2108 /* store one word */
2109 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2110 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2111 out->ptr[out->size + j - i] = '\n';
2112 out->size += j - i + 1;
2113
2114 i = j - 1;
2115 }
2116 }
2117
2118 /* this executes the word diff on the accumulated buffers */
2119 static void diff_words_show(struct diff_words_data *diff_words)
2120 {
2121 xpparam_t xpp;
2122 xdemitconf_t xecfg;
2123 mmfile_t minus, plus;
2124 struct diff_words_style *style = diff_words->style;
2125
2126 struct diff_options *opt = diff_words->opt;
2127 const char *line_prefix;
2128
2129 assert(opt);
2130 line_prefix = diff_line_prefix(opt);
2131
2132 /* special case: only removal */
2133 if (!diff_words->plus.text.size) {
2134 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2135 line_prefix, strlen(line_prefix), 0);
2136 fn_out_diff_words_write_helper(diff_words->opt,
2137 &style->old_word, style->newline,
2138 diff_words->minus.text.size,
2139 diff_words->minus.text.ptr);
2140 diff_words->minus.text.size = 0;
2141 return;
2142 }
2143
2144 diff_words->current_plus = diff_words->plus.text.ptr;
2145 diff_words->last_minus = 0;
2146
2147 memset(&xpp, 0, sizeof(xpp));
2148 memset(&xecfg, 0, sizeof(xecfg));
2149 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2150 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2151 xpp.flags = 0;
2152 /* as only the hunk header will be parsed, we need a 0-context */
2153 xecfg.ctxlen = 0;
2154 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2155 diff_words, &xpp, &xecfg))
2156 die("unable to generate word diff");
2157 free(minus.ptr);
2158 free(plus.ptr);
2159 if (diff_words->current_plus != diff_words->plus.text.ptr +
2160 diff_words->plus.text.size) {
2161 if (color_words_output_graph_prefix(diff_words))
2162 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2163 line_prefix, strlen(line_prefix), 0);
2164 fn_out_diff_words_write_helper(diff_words->opt,
2165 &style->ctx, style->newline,
2166 diff_words->plus.text.ptr + diff_words->plus.text.size
2167 - diff_words->current_plus, diff_words->current_plus);
2168 }
2169 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2170 }
2171
2172 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2173 static void diff_words_flush(struct emit_callback *ecbdata)
2174 {
2175 struct diff_options *wo = ecbdata->diff_words->opt;
2176
2177 if (ecbdata->diff_words->minus.text.size ||
2178 ecbdata->diff_words->plus.text.size)
2179 diff_words_show(ecbdata->diff_words);
2180
2181 if (wo->emitted_symbols) {
2182 struct diff_options *o = ecbdata->opt;
2183 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2184 int i;
2185
2186 /*
2187 * NEEDSWORK:
2188 * Instead of appending each, concat all words to a line?
2189 */
2190 for (i = 0; i < wol->nr; i++)
2191 append_emitted_diff_symbol(o, &wol->buf[i]);
2192
2193 for (i = 0; i < wol->nr; i++)
2194 free((void *)wol->buf[i].line);
2195
2196 wol->nr = 0;
2197 }
2198 }
2199
2200 static void diff_filespec_load_driver(struct diff_filespec *one,
2201 struct index_state *istate)
2202 {
2203 /* Use already-loaded driver */
2204 if (one->driver)
2205 return;
2206
2207 if (S_ISREG(one->mode))
2208 one->driver = userdiff_find_by_path(istate, one->path);
2209
2210 /* Fallback to default settings */
2211 if (!one->driver)
2212 one->driver = userdiff_find_by_name("default");
2213 }
2214
2215 static const char *userdiff_word_regex(struct diff_filespec *one,
2216 struct index_state *istate)
2217 {
2218 diff_filespec_load_driver(one, istate);
2219 return one->driver->word_regex;
2220 }
2221
2222 static void init_diff_words_data(struct emit_callback *ecbdata,
2223 struct diff_options *orig_opts,
2224 struct diff_filespec *one,
2225 struct diff_filespec *two)
2226 {
2227 int i;
2228 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2229 memcpy(o, orig_opts, sizeof(struct diff_options));
2230
2231 ecbdata->diff_words =
2232 xcalloc(1, sizeof(struct diff_words_data));
2233 ecbdata->diff_words->type = o->word_diff;
2234 ecbdata->diff_words->opt = o;
2235
2236 if (orig_opts->emitted_symbols)
2237 o->emitted_symbols =
2238 xcalloc(1, sizeof(struct emitted_diff_symbols));
2239
2240 if (!o->word_regex)
2241 o->word_regex = userdiff_word_regex(one, o->repo->index);
2242 if (!o->word_regex)
2243 o->word_regex = userdiff_word_regex(two, o->repo->index);
2244 if (!o->word_regex)
2245 o->word_regex = diff_word_regex_cfg;
2246 if (o->word_regex) {
2247 ecbdata->diff_words->word_regex = (regex_t *)
2248 xmalloc(sizeof(regex_t));
2249 if (regcomp(ecbdata->diff_words->word_regex,
2250 o->word_regex,
2251 REG_EXTENDED | REG_NEWLINE))
2252 die("invalid regular expression: %s",
2253 o->word_regex);
2254 }
2255 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2256 if (o->word_diff == diff_words_styles[i].type) {
2257 ecbdata->diff_words->style =
2258 &diff_words_styles[i];
2259 break;
2260 }
2261 }
2262 if (want_color(o->use_color)) {
2263 struct diff_words_style *st = ecbdata->diff_words->style;
2264 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2265 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2266 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2267 }
2268 }
2269
2270 static void free_diff_words_data(struct emit_callback *ecbdata)
2271 {
2272 if (ecbdata->diff_words) {
2273 diff_words_flush(ecbdata);
2274 free (ecbdata->diff_words->opt->emitted_symbols);
2275 free (ecbdata->diff_words->opt);
2276 free (ecbdata->diff_words->minus.text.ptr);
2277 free (ecbdata->diff_words->minus.orig);
2278 free (ecbdata->diff_words->plus.text.ptr);
2279 free (ecbdata->diff_words->plus.orig);
2280 if (ecbdata->diff_words->word_regex) {
2281 regfree(ecbdata->diff_words->word_regex);
2282 free(ecbdata->diff_words->word_regex);
2283 }
2284 FREE_AND_NULL(ecbdata->diff_words);
2285 }
2286 }
2287
2288 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2289 {
2290 if (want_color(diff_use_color))
2291 return diff_colors[ix];
2292 return "";
2293 }
2294
2295 const char *diff_line_prefix(struct diff_options *opt)
2296 {
2297 struct strbuf *msgbuf;
2298 if (!opt->output_prefix)
2299 return "";
2300
2301 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2302 return msgbuf->buf;
2303 }
2304
2305 static unsigned long sane_truncate_line(char *line, unsigned long len)
2306 {
2307 const char *cp;
2308 unsigned long allot;
2309 size_t l = len;
2310
2311 cp = line;
2312 allot = l;
2313 while (0 < l) {
2314 (void) utf8_width(&cp, &l);
2315 if (!cp)
2316 break; /* truncated in the middle? */
2317 }
2318 return allot - l;
2319 }
2320
2321 static void find_lno(const char *line, struct emit_callback *ecbdata)
2322 {
2323 const char *p;
2324 ecbdata->lno_in_preimage = 0;
2325 ecbdata->lno_in_postimage = 0;
2326 p = strchr(line, '-');
2327 if (!p)
2328 return; /* cannot happen */
2329 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2330 p = strchr(p, '+');
2331 if (!p)
2332 return; /* cannot happen */
2333 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2334 }
2335
2336 static void fn_out_consume(void *priv, char *line, unsigned long len)
2337 {
2338 struct emit_callback *ecbdata = priv;
2339 struct diff_options *o = ecbdata->opt;
2340
2341 o->found_changes = 1;
2342
2343 if (ecbdata->header) {
2344 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2345 ecbdata->header->buf, ecbdata->header->len, 0);
2346 strbuf_reset(ecbdata->header);
2347 ecbdata->header = NULL;
2348 }
2349
2350 if (ecbdata->label_path[0]) {
2351 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2352 ecbdata->label_path[0],
2353 strlen(ecbdata->label_path[0]), 0);
2354 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2355 ecbdata->label_path[1],
2356 strlen(ecbdata->label_path[1]), 0);
2357 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2358 }
2359
2360 if (diff_suppress_blank_empty
2361 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2362 line[0] = '\n';
2363 len = 1;
2364 }
2365
2366 if (line[0] == '@') {
2367 if (ecbdata->diff_words)
2368 diff_words_flush(ecbdata);
2369 len = sane_truncate_line(line, len);
2370 find_lno(line, ecbdata);
2371 emit_hunk_header(ecbdata, line, len);
2372 return;
2373 }
2374
2375 if (ecbdata->diff_words) {
2376 enum diff_symbol s =
2377 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2378 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2379 if (line[0] == '-') {
2380 diff_words_append(line, len,
2381 &ecbdata->diff_words->minus);
2382 return;
2383 } else if (line[0] == '+') {
2384 diff_words_append(line, len,
2385 &ecbdata->diff_words->plus);
2386 return;
2387 } else if (starts_with(line, "\\ ")) {
2388 /*
2389 * Eat the "no newline at eof" marker as if we
2390 * saw a "+" or "-" line with nothing on it,
2391 * and return without diff_words_flush() to
2392 * defer processing. If this is the end of
2393 * preimage, more "+" lines may come after it.
2394 */
2395 return;
2396 }
2397 diff_words_flush(ecbdata);
2398 emit_diff_symbol(o, s, line, len, 0);
2399 return;
2400 }
2401
2402 switch (line[0]) {
2403 case '+':
2404 ecbdata->lno_in_postimage++;
2405 emit_add_line(ecbdata, line + 1, len - 1);
2406 break;
2407 case '-':
2408 ecbdata->lno_in_preimage++;
2409 emit_del_line(ecbdata, line + 1, len - 1);
2410 break;
2411 case ' ':
2412 ecbdata->lno_in_postimage++;
2413 ecbdata->lno_in_preimage++;
2414 emit_context_line(ecbdata, line + 1, len - 1);
2415 break;
2416 default:
2417 /* incomplete line at the end */
2418 ecbdata->lno_in_preimage++;
2419 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2420 line, len, 0);
2421 break;
2422 }
2423 }
2424
2425 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2426 {
2427 const char *old_name = a;
2428 const char *new_name = b;
2429 int pfx_length, sfx_length;
2430 int pfx_adjust_for_slash;
2431 int len_a = strlen(a);
2432 int len_b = strlen(b);
2433 int a_midlen, b_midlen;
2434 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2435 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2436
2437 if (qlen_a || qlen_b) {
2438 quote_c_style(a, name, NULL, 0);
2439 strbuf_addstr(name, " => ");
2440 quote_c_style(b, name, NULL, 0);
2441 return;
2442 }
2443
2444 /* Find common prefix */
2445 pfx_length = 0;
2446 while (*old_name && *new_name && *old_name == *new_name) {
2447 if (*old_name == '/')
2448 pfx_length = old_name - a + 1;
2449 old_name++;
2450 new_name++;
2451 }
2452
2453 /* Find common suffix */
2454 old_name = a + len_a;
2455 new_name = b + len_b;
2456 sfx_length = 0;
2457 /*
2458 * If there is a common prefix, it must end in a slash. In
2459 * that case we let this loop run 1 into the prefix to see the
2460 * same slash.
2461 *
2462 * If there is no common prefix, we cannot do this as it would
2463 * underrun the input strings.
2464 */
2465 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2466 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2467 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2468 *old_name == *new_name) {
2469 if (*old_name == '/')
2470 sfx_length = len_a - (old_name - a);
2471 old_name--;
2472 new_name--;
2473 }
2474
2475 /*
2476 * pfx{mid-a => mid-b}sfx
2477 * {pfx-a => pfx-b}sfx
2478 * pfx{sfx-a => sfx-b}
2479 * name-a => name-b
2480 */
2481 a_midlen = len_a - pfx_length - sfx_length;
2482 b_midlen = len_b - pfx_length - sfx_length;
2483 if (a_midlen < 0)
2484 a_midlen = 0;
2485 if (b_midlen < 0)
2486 b_midlen = 0;
2487
2488 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2489 if (pfx_length + sfx_length) {
2490 strbuf_add(name, a, pfx_length);
2491 strbuf_addch(name, '{');
2492 }
2493 strbuf_add(name, a + pfx_length, a_midlen);
2494 strbuf_addstr(name, " => ");
2495 strbuf_add(name, b + pfx_length, b_midlen);
2496 if (pfx_length + sfx_length) {
2497 strbuf_addch(name, '}');
2498 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2499 }
2500 }
2501
2502 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2503 const char *name_a,
2504 const char *name_b)
2505 {
2506 struct diffstat_file *x;
2507 x = xcalloc(1, sizeof(*x));
2508 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2509 diffstat->files[diffstat->nr++] = x;
2510 if (name_b) {
2511 x->from_name = xstrdup(name_a);
2512 x->name = xstrdup(name_b);
2513 x->is_renamed = 1;
2514 }
2515 else {
2516 x->from_name = NULL;
2517 x->name = xstrdup(name_a);
2518 }
2519 return x;
2520 }
2521
2522 static void diffstat_consume(void *priv, char *line, unsigned long len)
2523 {
2524 struct diffstat_t *diffstat = priv;
2525 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2526
2527 if (line[0] == '+')
2528 x->added++;
2529 else if (line[0] == '-')
2530 x->deleted++;
2531 }
2532
2533 const char mime_boundary_leader[] = "------------";
2534
2535 static int scale_linear(int it, int width, int max_change)
2536 {
2537 if (!it)
2538 return 0;
2539 /*
2540 * make sure that at least one '-' or '+' is printed if
2541 * there is any change to this path. The easiest way is to
2542 * scale linearly as if the allotted width is one column shorter
2543 * than it is, and then add 1 to the result.
2544 */
2545 return 1 + (it * (width - 1) / max_change);
2546 }
2547
2548 static void show_graph(struct strbuf *out, char ch, int cnt,
2549 const char *set, const char *reset)
2550 {
2551 if (cnt <= 0)
2552 return;
2553 strbuf_addstr(out, set);
2554 strbuf_addchars(out, ch, cnt);
2555 strbuf_addstr(out, reset);
2556 }
2557
2558 static void fill_print_name(struct diffstat_file *file)
2559 {
2560 struct strbuf pname = STRBUF_INIT;
2561
2562 if (file->print_name)
2563 return;
2564
2565 if (file->is_renamed)
2566 pprint_rename(&pname, file->from_name, file->name);
2567 else
2568 quote_c_style(file->name, &pname, NULL, 0);
2569
2570 if (file->comments)
2571 strbuf_addf(&pname, " (%s)", file->comments);
2572
2573 file->print_name = strbuf_detach(&pname, NULL);
2574 }
2575
2576 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2577 int files, int insertions, int deletions)
2578 {
2579 struct strbuf sb = STRBUF_INIT;
2580
2581 if (!files) {
2582 assert(insertions == 0 && deletions == 0);
2583 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2584 NULL, 0, 0);
2585 return;
2586 }
2587
2588 strbuf_addf(&sb,
2589 (files == 1) ? " %d file changed" : " %d files changed",
2590 files);
2591
2592 /*
2593 * For binary diff, the caller may want to print "x files
2594 * changed" with insertions == 0 && deletions == 0.
2595 *
2596 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2597 * is probably less confusing (i.e skip over "2 files changed
2598 * but nothing about added/removed lines? Is this a bug in Git?").
2599 */
2600 if (insertions || deletions == 0) {
2601 strbuf_addf(&sb,
2602 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2603 insertions);
2604 }
2605
2606 if (deletions || insertions == 0) {
2607 strbuf_addf(&sb,
2608 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2609 deletions);
2610 }
2611 strbuf_addch(&sb, '\n');
2612 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2613 sb.buf, sb.len, 0);
2614 strbuf_release(&sb);
2615 }
2616
2617 void print_stat_summary(FILE *fp, int files,
2618 int insertions, int deletions)
2619 {
2620 struct diff_options o;
2621 memset(&o, 0, sizeof(o));
2622 o.file = fp;
2623
2624 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2625 }
2626
2627 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2628 {
2629 int i, len, add, del, adds = 0, dels = 0;
2630 uintmax_t max_change = 0, max_len = 0;
2631 int total_files = data->nr, count;
2632 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2633 const char *reset, *add_c, *del_c;
2634 int extra_shown = 0;
2635 const char *line_prefix = diff_line_prefix(options);
2636 struct strbuf out = STRBUF_INIT;
2637
2638 if (data->nr == 0)
2639 return;
2640
2641 count = options->stat_count ? options->stat_count : data->nr;
2642
2643 reset = diff_get_color_opt(options, DIFF_RESET);
2644 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2645 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2646
2647 /*
2648 * Find the longest filename and max number of changes
2649 */
2650 for (i = 0; (i < count) && (i < data->nr); i++) {
2651 struct diffstat_file *file = data->files[i];
2652 uintmax_t change = file->added + file->deleted;
2653
2654 if (!file->is_interesting && (change == 0)) {
2655 count++; /* not shown == room for one more */
2656 continue;
2657 }
2658 fill_print_name(file);
2659 len = strlen(file->print_name);
2660 if (max_len < len)
2661 max_len = len;
2662
2663 if (file->is_unmerged) {
2664 /* "Unmerged" is 8 characters */
2665 bin_width = bin_width < 8 ? 8 : bin_width;
2666 continue;
2667 }
2668 if (file->is_binary) {
2669 /* "Bin XXX -> YYY bytes" */
2670 int w = 14 + decimal_width(file->added)
2671 + decimal_width(file->deleted);
2672 bin_width = bin_width < w ? w : bin_width;
2673 /* Display change counts aligned with "Bin" */
2674 number_width = 3;
2675 continue;
2676 }
2677
2678 if (max_change < change)
2679 max_change = change;
2680 }
2681 count = i; /* where we can stop scanning in data->files[] */
2682
2683 /*
2684 * We have width = stat_width or term_columns() columns total.
2685 * We want a maximum of min(max_len, stat_name_width) for the name part.
2686 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2687 * We also need 1 for " " and 4 + decimal_width(max_change)
2688 * for " | NNNN " and one the empty column at the end, altogether
2689 * 6 + decimal_width(max_change).
2690 *
2691 * If there's not enough space, we will use the smaller of
2692 * stat_name_width (if set) and 5/8*width for the filename,
2693 * and the rest for constant elements + graph part, but no more
2694 * than stat_graph_width for the graph part.
2695 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2696 * for the standard terminal size).
2697 *
2698 * In other words: stat_width limits the maximum width, and
2699 * stat_name_width fixes the maximum width of the filename,
2700 * and is also used to divide available columns if there
2701 * aren't enough.
2702 *
2703 * Binary files are displayed with "Bin XXX -> YYY bytes"
2704 * instead of the change count and graph. This part is treated
2705 * similarly to the graph part, except that it is not
2706 * "scaled". If total width is too small to accommodate the
2707 * guaranteed minimum width of the filename part and the
2708 * separators and this message, this message will "overflow"
2709 * making the line longer than the maximum width.
2710 */
2711
2712 if (options->stat_width == -1)
2713 width = term_columns() - strlen(line_prefix);
2714 else
2715 width = options->stat_width ? options->stat_width : 80;
2716 number_width = decimal_width(max_change) > number_width ?
2717 decimal_width(max_change) : number_width;
2718
2719 if (options->stat_graph_width == -1)
2720 options->stat_graph_width = diff_stat_graph_width;
2721
2722 /*
2723 * Guarantee 3/8*16==6 for the graph part
2724 * and 5/8*16==10 for the filename part
2725 */
2726 if (width < 16 + 6 + number_width)
2727 width = 16 + 6 + number_width;
2728
2729 /*
2730 * First assign sizes that are wanted, ignoring available width.
2731 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2732 * starting from "XXX" should fit in graph_width.
2733 */
2734 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2735 if (options->stat_graph_width &&
2736 options->stat_graph_width < graph_width)
2737 graph_width = options->stat_graph_width;
2738
2739 name_width = (options->stat_name_width > 0 &&
2740 options->stat_name_width < max_len) ?
2741 options->stat_name_width : max_len;
2742
2743 /*
2744 * Adjust adjustable widths not to exceed maximum width
2745 */
2746 if (name_width + number_width + 6 + graph_width > width) {
2747 if (graph_width > width * 3/8 - number_width - 6) {
2748 graph_width = width * 3/8 - number_width - 6;
2749 if (graph_width < 6)
2750 graph_width = 6;
2751 }
2752
2753 if (options->stat_graph_width &&
2754 graph_width > options->stat_graph_width)
2755 graph_width = options->stat_graph_width;
2756 if (name_width > width - number_width - 6 - graph_width)
2757 name_width = width - number_width - 6 - graph_width;
2758 else
2759 graph_width = width - number_width - 6 - name_width;
2760 }
2761
2762 /*
2763 * From here name_width is the width of the name area,
2764 * and graph_width is the width of the graph area.
2765 * max_change is used to scale graph properly.
2766 */
2767 for (i = 0; i < count; i++) {
2768 const char *prefix = "";
2769 struct diffstat_file *file = data->files[i];
2770 char *name = file->print_name;
2771 uintmax_t added = file->added;
2772 uintmax_t deleted = file->deleted;
2773 int name_len;
2774
2775 if (!file->is_interesting && (added + deleted == 0))
2776 continue;
2777
2778 /*
2779 * "scale" the filename
2780 */
2781 len = name_width;
2782 name_len = strlen(name);
2783 if (name_width < name_len) {
2784 char *slash;
2785 prefix = "...";
2786 len -= 3;
2787 name += name_len - len;
2788 slash = strchr(name, '/');
2789 if (slash)
2790 name = slash;
2791 }
2792
2793 if (file->is_binary) {
2794 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2795 strbuf_addf(&out, " %*s", number_width, "Bin");
2796 if (!added && !deleted) {
2797 strbuf_addch(&out, '\n');
2798 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2799 out.buf, out.len, 0);
2800 strbuf_reset(&out);
2801 continue;
2802 }
2803 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2804 del_c, deleted, reset);
2805 strbuf_addstr(&out, " -> ");
2806 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2807 add_c, added, reset);
2808 strbuf_addstr(&out, " bytes\n");
2809 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2810 out.buf, out.len, 0);
2811 strbuf_reset(&out);
2812 continue;
2813 }
2814 else if (file->is_unmerged) {
2815 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2816 strbuf_addstr(&out, " Unmerged\n");
2817 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2818 out.buf, out.len, 0);
2819 strbuf_reset(&out);
2820 continue;
2821 }
2822
2823 /*
2824 * scale the add/delete
2825 */
2826 add = added;
2827 del = deleted;
2828
2829 if (graph_width <= max_change) {
2830 int total = scale_linear(add + del, graph_width, max_change);
2831 if (total < 2 && add && del)
2832 /* width >= 2 due to the sanity check */
2833 total = 2;
2834 if (add < del) {
2835 add = scale_linear(add, graph_width, max_change);
2836 del = total - add;
2837 } else {
2838 del = scale_linear(del, graph_width, max_change);
2839 add = total - del;
2840 }
2841 }
2842 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2843 strbuf_addf(&out, " %*"PRIuMAX"%s",
2844 number_width, added + deleted,
2845 added + deleted ? " " : "");
2846 show_graph(&out, '+', add, add_c, reset);
2847 show_graph(&out, '-', del, del_c, reset);
2848 strbuf_addch(&out, '\n');
2849 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2850 out.buf, out.len, 0);
2851 strbuf_reset(&out);
2852 }
2853
2854 for (i = 0; i < data->nr; i++) {
2855 struct diffstat_file *file = data->files[i];
2856 uintmax_t added = file->added;
2857 uintmax_t deleted = file->deleted;
2858
2859 if (file->is_unmerged ||
2860 (!file->is_interesting && (added + deleted == 0))) {
2861 total_files--;
2862 continue;
2863 }
2864
2865 if (!file->is_binary) {
2866 adds += added;
2867 dels += deleted;
2868 }
2869 if (i < count)
2870 continue;
2871 if (!extra_shown)
2872 emit_diff_symbol(options,
2873 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2874 NULL, 0, 0);
2875 extra_shown = 1;
2876 }
2877
2878 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2879 strbuf_release(&out);
2880 }
2881
2882 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2883 {
2884 int i, adds = 0, dels = 0, total_files = data->nr;
2885
2886 if (data->nr == 0)
2887 return;
2888
2889 for (i = 0; i < data->nr; i++) {
2890 int added = data->files[i]->added;
2891 int deleted = data->files[i]->deleted;
2892
2893 if (data->files[i]->is_unmerged ||
2894 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2895 total_files--;
2896 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2897 adds += added;
2898 dels += deleted;
2899 }
2900 }
2901 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2902 }
2903
2904 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2905 {
2906 int i;
2907
2908 if (data->nr == 0)
2909 return;
2910
2911 for (i = 0; i < data->nr; i++) {
2912 struct diffstat_file *file = data->files[i];
2913
2914 fprintf(options->file, "%s", diff_line_prefix(options));
2915
2916 if (file->is_binary)
2917 fprintf(options->file, "-\t-\t");
2918 else
2919 fprintf(options->file,
2920 "%"PRIuMAX"\t%"PRIuMAX"\t",
2921 file->added, file->deleted);
2922 if (options->line_termination) {
2923 fill_print_name(file);
2924 if (!file->is_renamed)
2925 write_name_quoted(file->name, options->file,
2926 options->line_termination);
2927 else {
2928 fputs(file->print_name, options->file);
2929 putc(options->line_termination, options->file);
2930 }
2931 } else {
2932 if (file->is_renamed) {
2933 putc('\0', options->file);
2934 write_name_quoted(file->from_name, options->file, '\0');
2935 }
2936 write_name_quoted(file->name, options->file, '\0');
2937 }
2938 }
2939 }
2940
2941 struct dirstat_file {
2942 const char *name;
2943 unsigned long changed;
2944 };
2945
2946 struct dirstat_dir {
2947 struct dirstat_file *files;
2948 int alloc, nr, permille, cumulative;
2949 };
2950
2951 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2952 unsigned long changed, const char *base, int baselen)
2953 {
2954 unsigned long sum_changes = 0;
2955 unsigned int sources = 0;
2956 const char *line_prefix = diff_line_prefix(opt);
2957
2958 while (dir->nr) {
2959 struct dirstat_file *f = dir->files;
2960 int namelen = strlen(f->name);
2961 unsigned long changes;
2962 char *slash;
2963
2964 if (namelen < baselen)
2965 break;
2966 if (memcmp(f->name, base, baselen))
2967 break;
2968 slash = strchr(f->name + baselen, '/');
2969 if (slash) {
2970 int newbaselen = slash + 1 - f->name;
2971 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2972 sources++;
2973 } else {
2974 changes = f->changed;
2975 dir->files++;
2976 dir->nr--;
2977 sources += 2;
2978 }
2979 sum_changes += changes;
2980 }
2981
2982 /*
2983 * We don't report dirstat's for
2984 * - the top level
2985 * - or cases where everything came from a single directory
2986 * under this directory (sources == 1).
2987 */
2988 if (baselen && sources != 1) {
2989 if (sum_changes) {
2990 int permille = sum_changes * 1000 / changed;
2991 if (permille >= dir->permille) {
2992 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2993 permille / 10, permille % 10, baselen, base);
2994 if (!dir->cumulative)
2995 return 0;
2996 }
2997 }
2998 }
2999 return sum_changes;
3000 }
3001
3002 static int dirstat_compare(const void *_a, const void *_b)
3003 {
3004 const struct dirstat_file *a = _a;
3005 const struct dirstat_file *b = _b;
3006 return strcmp(a->name, b->name);
3007 }
3008
3009 static void show_dirstat(struct diff_options *options)
3010 {
3011 int i;
3012 unsigned long changed;
3013 struct dirstat_dir dir;
3014 struct diff_queue_struct *q = &diff_queued_diff;
3015
3016 dir.files = NULL;
3017 dir.alloc = 0;
3018 dir.nr = 0;
3019 dir.permille = options->dirstat_permille;
3020 dir.cumulative = options->flags.dirstat_cumulative;
3021
3022 changed = 0;
3023 for (i = 0; i < q->nr; i++) {
3024 struct diff_filepair *p = q->queue[i];
3025 const char *name;
3026 unsigned long copied, added, damage;
3027 struct diff_populate_filespec_options dpf_options = {
3028 .check_size_only = 1,
3029 };
3030
3031 name = p->two->path ? p->two->path : p->one->path;
3032
3033 if (p->one->oid_valid && p->two->oid_valid &&
3034 oideq(&p->one->oid, &p->two->oid)) {
3035 /*
3036 * The SHA1 has not changed, so pre-/post-content is
3037 * identical. We can therefore skip looking at the
3038 * file contents altogether.
3039 */
3040 damage = 0;
3041 goto found_damage;
3042 }
3043
3044 if (options->flags.dirstat_by_file) {
3045 /*
3046 * In --dirstat-by-file mode, we don't really need to
3047 * look at the actual file contents at all.
3048 * The fact that the SHA1 changed is enough for us to
3049 * add this file to the list of results
3050 * (with each file contributing equal damage).
3051 */
3052 damage = 1;
3053 goto found_damage;
3054 }
3055
3056 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
3057 diff_populate_filespec(options->repo, p->one, NULL);
3058 diff_populate_filespec(options->repo, p->two, NULL);
3059 diffcore_count_changes(options->repo,
3060 p->one, p->two, NULL, NULL,
3061 &copied, &added);
3062 diff_free_filespec_data(p->one);
3063 diff_free_filespec_data(p->two);
3064 } else if (DIFF_FILE_VALID(p->one)) {
3065 diff_populate_filespec(options->repo, p->one, &dpf_options);
3066 copied = added = 0;
3067 diff_free_filespec_data(p->one);
3068 } else if (DIFF_FILE_VALID(p->two)) {
3069 diff_populate_filespec(options->repo, p->two, &dpf_options);
3070 copied = 0;
3071 added = p->two->size;
3072 diff_free_filespec_data(p->two);
3073 } else
3074 continue;
3075
3076 /*
3077 * Original minus copied is the removed material,
3078 * added is the new material. They are both damages
3079 * made to the preimage.
3080 * If the resulting damage is zero, we know that
3081 * diffcore_count_changes() considers the two entries to
3082 * be identical, but since the oid changed, we
3083 * know that there must have been _some_ kind of change,
3084 * so we force all entries to have damage > 0.
3085 */
3086 damage = (p->one->size - copied) + added;
3087 if (!damage)
3088 damage = 1;
3089
3090 found_damage:
3091 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3092 dir.files[dir.nr].name = name;
3093 dir.files[dir.nr].changed = damage;
3094 changed += damage;
3095 dir.nr++;
3096 }
3097
3098 /* This can happen even with many files, if everything was renames */
3099 if (!changed)
3100 return;
3101
3102 /* Show all directories with more than x% of the changes */
3103 QSORT(dir.files, dir.nr, dirstat_compare);
3104 gather_dirstat(options, &dir, changed, "", 0);
3105 }
3106
3107 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3108 {
3109 int i;
3110 unsigned long changed;
3111 struct dirstat_dir dir;
3112
3113 if (data->nr == 0)
3114 return;
3115
3116 dir.files = NULL;
3117 dir.alloc = 0;
3118 dir.nr = 0;
3119 dir.permille = options->dirstat_permille;
3120 dir.cumulative = options->flags.dirstat_cumulative;
3121
3122 changed = 0;
3123 for (i = 0; i < data->nr; i++) {
3124 struct diffstat_file *file = data->files[i];
3125 unsigned long damage = file->added + file->deleted;
3126 if (file->is_binary)
3127 /*
3128 * binary files counts bytes, not lines. Must find some
3129 * way to normalize binary bytes vs. textual lines.
3130 * The following heuristic assumes that there are 64
3131 * bytes per "line".
3132 * This is stupid and ugly, but very cheap...
3133 */
3134 damage = DIV_ROUND_UP(damage, 64);
3135 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3136 dir.files[dir.nr].name = file->name;
3137 dir.files[dir.nr].changed = damage;
3138 changed += damage;
3139 dir.nr++;
3140 }
3141
3142 /* This can happen even with many files, if everything was renames */
3143 if (!changed)
3144 return;
3145
3146 /* Show all directories with more than x% of the changes */
3147 QSORT(dir.files, dir.nr, dirstat_compare);
3148 gather_dirstat(options, &dir, changed, "", 0);
3149 }
3150
3151 void free_diffstat_info(struct diffstat_t *diffstat)
3152 {
3153 int i;
3154 for (i = 0; i < diffstat->nr; i++) {
3155 struct diffstat_file *f = diffstat->files[i];
3156 free(f->print_name);
3157 free(f->name);
3158 free(f->from_name);
3159 free(f);
3160 }
3161 free(diffstat->files);
3162 }
3163
3164 struct checkdiff_t {
3165 const char *filename;
3166 int lineno;
3167 int conflict_marker_size;
3168 struct diff_options *o;
3169 unsigned ws_rule;
3170 unsigned status;
3171 };
3172
3173 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3174 {
3175 char firstchar;
3176 int cnt;
3177
3178 if (len < marker_size + 1)
3179 return 0;
3180 firstchar = line[0];
3181 switch (firstchar) {
3182 case '=': case '>': case '<': case '|':
3183 break;
3184 default:
3185 return 0;
3186 }
3187 for (cnt = 1; cnt < marker_size; cnt++)
3188 if (line[cnt] != firstchar)
3189 return 0;
3190 /* line[1] through line[marker_size-1] are same as firstchar */
3191 if (len < marker_size + 1 || !isspace(line[marker_size]))
3192 return 0;
3193 return 1;
3194 }
3195
3196 static void checkdiff_consume_hunk(void *priv,
3197 long ob, long on, long nb, long nn,
3198 const char *func, long funclen)
3199
3200 {
3201 struct checkdiff_t *data = priv;
3202 data->lineno = nb - 1;
3203 }
3204
3205 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3206 {
3207 struct checkdiff_t *data = priv;
3208 int marker_size = data->conflict_marker_size;
3209 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3210 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3211 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3212 char *err;
3213 const char *line_prefix;
3214
3215 assert(data->o);
3216 line_prefix = diff_line_prefix(data->o);
3217
3218 if (line[0] == '+') {
3219 unsigned bad;
3220 data->lineno++;
3221 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3222 data->status |= 1;
3223 fprintf(data->o->file,
3224 "%s%s:%d: leftover conflict marker\n",
3225 line_prefix, data->filename, data->lineno);
3226 }
3227 bad = ws_check(line + 1, len - 1, data->ws_rule);
3228 if (!bad)
3229 return;
3230 data->status |= bad;
3231 err = whitespace_error_string(bad);
3232 fprintf(data->o->file, "%s%s:%d: %s.\n",
3233 line_prefix, data->filename, data->lineno, err);
3234 free(err);
3235 emit_line(data->o, set, reset, line, 1);
3236 ws_check_emit(line + 1, len - 1, data->ws_rule,
3237 data->o->file, set, reset, ws);
3238 } else if (line[0] == ' ') {
3239 data->lineno++;
3240 }
3241 }
3242
3243 static unsigned char *deflate_it(char *data,
3244 unsigned long size,
3245 unsigned long *result_size)
3246 {
3247 int bound;
3248 unsigned char *deflated;
3249 git_zstream stream;
3250
3251 git_deflate_init(&stream, zlib_compression_level);
3252 bound = git_deflate_bound(&stream, size);
3253 deflated = xmalloc(bound);
3254 stream.next_out = deflated;
3255 stream.avail_out = bound;
3256
3257 stream.next_in = (unsigned char *)data;
3258 stream.avail_in = size;
3259 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3260 ; /* nothing */
3261 git_deflate_end(&stream);
3262 *result_size = stream.total_out;
3263 return deflated;
3264 }
3265
3266 static void emit_binary_diff_body(struct diff_options *o,
3267 mmfile_t *one, mmfile_t *two)
3268 {
3269 void *cp;
3270 void *delta;
3271 void *deflated;
3272 void *data;
3273 unsigned long orig_size;
3274 unsigned long delta_size;
3275 unsigned long deflate_size;
3276 unsigned long data_size;
3277
3278 /* We could do deflated delta, or we could do just deflated two,
3279 * whichever is smaller.
3280 */
3281 delta = NULL;
3282 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3283 if (one->size && two->size) {
3284 delta = diff_delta(one->ptr, one->size,
3285 two->ptr, two->size,
3286 &delta_size, deflate_size);
3287 if (delta) {
3288 void *to_free = delta;
3289 orig_size = delta_size;
3290 delta = deflate_it(delta, delta_size, &delta_size);
3291 free(to_free);
3292 }
3293 }
3294
3295 if (delta && delta_size < deflate_size) {
3296 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3297 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3298 s, strlen(s), 0);
3299 free(s);
3300 free(deflated);
3301 data = delta;
3302 data_size = delta_size;
3303 } else {
3304 char *s = xstrfmt("%lu", two->size);
3305 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3306 s, strlen(s), 0);
3307 free(s);
3308 free(delta);
3309 data = deflated;
3310 data_size = deflate_size;
3311 }
3312
3313 /* emit data encoded in base85 */
3314 cp = data;
3315 while (data_size) {
3316 int len;
3317 int bytes = (52 < data_size) ? 52 : data_size;
3318 char line[71];
3319 data_size -= bytes;
3320 if (bytes <= 26)
3321 line[0] = bytes + 'A' - 1;
3322 else
3323 line[0] = bytes - 26 + 'a' - 1;
3324 encode_85(line + 1, cp, bytes);
3325 cp = (char *) cp + bytes;
3326
3327 len = strlen(line);
3328 line[len++] = '\n';
3329 line[len] = '\0';
3330
3331 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3332 line, len, 0);
3333 }
3334 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3335 free(data);
3336 }
3337
3338 static void emit_binary_diff(struct diff_options *o,
3339 mmfile_t *one, mmfile_t *two)
3340 {
3341 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3342 emit_binary_diff_body(o, one, two);
3343 emit_binary_diff_body(o, two, one);
3344 }
3345
3346 int diff_filespec_is_binary(struct repository *r,
3347 struct diff_filespec *one)
3348 {
3349 struct diff_populate_filespec_options dpf_options = {
3350 .check_binary = 1,
3351 };
3352
3353 if (one->is_binary == -1) {
3354 diff_filespec_load_driver(one, r->index);
3355 if (one->driver->binary != -1)
3356 one->is_binary = one->driver->binary;
3357 else {
3358 if (!one->data && DIFF_FILE_VALID(one))
3359 diff_populate_filespec(r, one, &dpf_options);
3360 if (one->is_binary == -1 && one->data)
3361 one->is_binary = buffer_is_binary(one->data,
3362 one->size);
3363 if (one->is_binary == -1)
3364 one->is_binary = 0;
3365 }
3366 }
3367 return one->is_binary;
3368 }
3369
3370 static const struct userdiff_funcname *
3371 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3372 {
3373 diff_filespec_load_driver(one, o->repo->index);
3374 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3375 }
3376
3377 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3378 {
3379 if (!options->a_prefix)
3380 options->a_prefix = a;
3381 if (!options->b_prefix)
3382 options->b_prefix = b;
3383 }
3384
3385 struct userdiff_driver *get_textconv(struct repository *r,
3386 struct diff_filespec *one)
3387 {
3388 if (!DIFF_FILE_VALID(one))
3389 return NULL;
3390
3391 diff_filespec_load_driver(one, r->index);
3392 return userdiff_get_textconv(r, one->driver);
3393 }
3394
3395 static void builtin_diff(const char *name_a,
3396 const char *name_b,
3397 struct diff_filespec *one,
3398 struct diff_filespec *two,
3399 const char *xfrm_msg,
3400 int must_show_header,
3401 struct diff_options *o,
3402 int complete_rewrite)
3403 {
3404 mmfile_t mf1, mf2;
3405 const char *lbl[2];
3406 char *a_one, *b_two;
3407 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3408 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3409 const char *a_prefix, *b_prefix;
3410 struct userdiff_driver *textconv_one = NULL;
3411 struct userdiff_driver *textconv_two = NULL;
3412 struct strbuf header = STRBUF_INIT;
3413 const char *line_prefix = diff_line_prefix(o);
3414
3415 diff_set_mnemonic_prefix(o, "a/", "b/");
3416 if (o->flags.reverse_diff) {
3417 a_prefix = o->b_prefix;
3418 b_prefix = o->a_prefix;
3419 } else {
3420 a_prefix = o->a_prefix;
3421 b_prefix = o->b_prefix;
3422 }
3423
3424 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3425 (!one->mode || S_ISGITLINK(one->mode)) &&
3426 (!two->mode || S_ISGITLINK(two->mode))) {
3427 show_submodule_summary(o, one->path ? one->path : two->path,
3428 &one->oid, &two->oid,
3429 two->dirty_submodule);
3430 return;
3431 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3432 (!one->mode || S_ISGITLINK(one->mode)) &&
3433 (!two->mode || S_ISGITLINK(two->mode))) {
3434 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3435 &one->oid, &two->oid,
3436 two->dirty_submodule);
3437 return;
3438 }
3439
3440 if (o->flags.allow_textconv) {
3441 textconv_one = get_textconv(o->repo, one);
3442 textconv_two = get_textconv(o->repo, two);
3443 }
3444
3445 /* Never use a non-valid filename anywhere if at all possible */
3446 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3447 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3448
3449 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3450 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3451 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3452 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3453 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3454 if (lbl[0][0] == '/') {
3455 /* /dev/null */
3456 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3457 if (xfrm_msg)
3458 strbuf_addstr(&header, xfrm_msg);
3459 must_show_header = 1;
3460 }
3461 else if (lbl[1][0] == '/') {
3462 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3463 if (xfrm_msg)
3464 strbuf_addstr(&header, xfrm_msg);
3465 must_show_header = 1;
3466 }
3467 else {
3468 if (one->mode != two->mode) {
3469 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3470 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3471 must_show_header = 1;
3472 }
3473 if (xfrm_msg)
3474 strbuf_addstr(&header, xfrm_msg);
3475
3476 /*
3477 * we do not run diff between different kind
3478 * of objects.
3479 */
3480 if ((one->mode ^ two->mode) & S_IFMT)
3481 goto free_ab_and_return;
3482 if (complete_rewrite &&
3483 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3484 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3485 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3486 header.buf, header.len, 0);
3487 strbuf_reset(&header);
3488 emit_rewrite_diff(name_a, name_b, one, two,
3489 textconv_one, textconv_two, o);
3490 o->found_changes = 1;
3491 goto free_ab_and_return;
3492 }
3493 }
3494
3495 if (o->irreversible_delete && lbl[1][0] == '/') {
3496 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3497 header.len, 0);
3498 strbuf_reset(&header);
3499 goto free_ab_and_return;
3500 } else if (!o->flags.text &&
3501 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3502 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3503 struct strbuf sb = STRBUF_INIT;
3504 if (!one->data && !two->data &&
3505 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3506 !o->flags.binary) {
3507 if (oideq(&one->oid, &two->oid)) {
3508 if (must_show_header)
3509 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3510 header.buf, header.len,
3511 0);
3512 goto free_ab_and_return;
3513 }
3514 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3515 header.buf, header.len, 0);
3516 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3517 diff_line_prefix(o), lbl[0], lbl[1]);
3518 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3519 sb.buf, sb.len, 0);
3520 strbuf_release(&sb);
3521 goto free_ab_and_return;
3522 }
3523 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3524 fill_mmfile(o->repo, &mf2, two) < 0)
3525 die("unable to read files to diff");
3526 /* Quite common confusing case */
3527 if (mf1.size == mf2.size &&
3528 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3529 if (must_show_header)
3530 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3531 header.buf, header.len, 0);
3532 goto free_ab_and_return;
3533 }
3534 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3535 strbuf_reset(&header);
3536 if (o->flags.binary)
3537 emit_binary_diff(o, &mf1, &mf2);
3538 else {
3539 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3540 diff_line_prefix(o), lbl[0], lbl[1]);
3541 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3542 sb.buf, sb.len, 0);
3543 strbuf_release(&sb);
3544 }
3545 o->found_changes = 1;
3546 } else {
3547 /* Crazy xdl interfaces.. */
3548 const char *diffopts;
3549 const char *v;
3550 xpparam_t xpp;
3551 xdemitconf_t xecfg;
3552 struct emit_callback ecbdata;
3553 const struct userdiff_funcname *pe;
3554
3555 if (must_show_header) {
3556 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3557 header.buf, header.len, 0);
3558 strbuf_reset(&header);
3559 }
3560
3561 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3562 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3563
3564 pe = diff_funcname_pattern(o, one);
3565 if (!pe)
3566 pe = diff_funcname_pattern(o, two);
3567
3568 memset(&xpp, 0, sizeof(xpp));
3569 memset(&xecfg, 0, sizeof(xecfg));
3570 memset(&ecbdata, 0, sizeof(ecbdata));
3571 if (o->flags.suppress_diff_headers)
3572 lbl[0] = NULL;
3573 ecbdata.label_path = lbl;
3574 ecbdata.color_diff = want_color(o->use_color);
3575 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3576 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3577 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3578 ecbdata.opt = o;
3579 if (header.len && !o->flags.suppress_diff_headers)
3580 ecbdata.header = &header;
3581 xpp.flags = o->xdl_opts;
3582 xpp.anchors = o->anchors;
3583 xpp.anchors_nr = o->anchors_nr;
3584 xecfg.ctxlen = o->context;
3585 xecfg.interhunkctxlen = o->interhunkcontext;
3586 xecfg.flags = XDL_EMIT_FUNCNAMES;
3587 if (o->flags.funccontext)
3588 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3589 if (pe)
3590 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3591
3592 diffopts = getenv("GIT_DIFF_OPTS");
3593 if (!diffopts)
3594 ;
3595 else if (skip_prefix(diffopts, "--unified=", &v))
3596 xecfg.ctxlen = strtoul(v, NULL, 10);
3597 else if (skip_prefix(diffopts, "-u", &v))
3598 xecfg.ctxlen = strtoul(v, NULL, 10);
3599
3600 if (o->word_diff)
3601 init_diff_words_data(&ecbdata, o, one, two);
3602 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3603 &ecbdata, &xpp, &xecfg))
3604 die("unable to generate diff for %s", one->path);
3605 if (o->word_diff)
3606 free_diff_words_data(&ecbdata);
3607 if (textconv_one)
3608 free(mf1.ptr);
3609 if (textconv_two)
3610 free(mf2.ptr);
3611 xdiff_clear_find_func(&xecfg);
3612 }
3613
3614 free_ab_and_return:
3615 strbuf_release(&header);
3616 diff_free_filespec_data(one);
3617 diff_free_filespec_data(two);
3618 free(a_one);
3619 free(b_two);
3620 return;
3621 }
3622
3623 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3624 {
3625 if (!is_renamed) {
3626 if (p->status == DIFF_STATUS_ADDED) {
3627 if (S_ISLNK(p->two->mode))
3628 return "new +l";
3629 else if ((p->two->mode & 0777) == 0755)
3630 return "new +x";
3631 else
3632 return "new";
3633 } else if (p->status == DIFF_STATUS_DELETED)
3634 return "gone";
3635 }
3636 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3637 return "mode -l";
3638 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3639 return "mode +l";
3640 else if ((p->one->mode & 0777) == 0644 &&
3641 (p->two->mode & 0777) == 0755)
3642 return "mode +x";
3643 else if ((p->one->mode & 0777) == 0755 &&
3644 (p->two->mode & 0777) == 0644)
3645 return "mode -x";
3646 return NULL;
3647 }
3648
3649 static void builtin_diffstat(const char *name_a, const char *name_b,
3650 struct diff_filespec *one,
3651 struct diff_filespec *two,
3652 struct diffstat_t *diffstat,
3653 struct diff_options *o,
3654 struct diff_filepair *p)
3655 {
3656 mmfile_t mf1, mf2;
3657 struct diffstat_file *data;
3658 int same_contents;
3659 int complete_rewrite = 0;
3660
3661 if (!DIFF_PAIR_UNMERGED(p)) {
3662 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3663 complete_rewrite = 1;
3664 }
3665
3666 data = diffstat_add(diffstat, name_a, name_b);
3667 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3668 if (o->flags.stat_with_summary)
3669 data->comments = get_compact_summary(p, data->is_renamed);
3670
3671 if (!one || !two) {
3672 data->is_unmerged = 1;
3673 return;
3674 }
3675
3676 same_contents = oideq(&one->oid, &two->oid);
3677
3678 if (diff_filespec_is_binary(o->repo, one) ||
3679 diff_filespec_is_binary(o->repo, two)) {
3680 data->is_binary = 1;
3681 if (same_contents) {
3682 data->added = 0;
3683 data->deleted = 0;
3684 } else {
3685 data->added = diff_filespec_size(o->repo, two);
3686 data->deleted = diff_filespec_size(o->repo, one);
3687 }
3688 }
3689
3690 else if (complete_rewrite) {
3691 diff_populate_filespec(o->repo, one, NULL);
3692 diff_populate_filespec(o->repo, two, NULL);
3693 data->deleted = count_lines(one->data, one->size);
3694 data->added = count_lines(two->data, two->size);
3695 }
3696
3697 else if (!same_contents) {
3698 /* Crazy xdl interfaces.. */
3699 xpparam_t xpp;
3700 xdemitconf_t xecfg;
3701
3702 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3703 fill_mmfile(o->repo, &mf2, two) < 0)
3704 die("unable to read files to diff");
3705
3706 memset(&xpp, 0, sizeof(xpp));
3707 memset(&xecfg, 0, sizeof(xecfg));
3708 xpp.flags = o->xdl_opts;
3709 xpp.anchors = o->anchors;
3710 xpp.anchors_nr = o->anchors_nr;
3711 xecfg.ctxlen = o->context;
3712 xecfg.interhunkctxlen = o->interhunkcontext;
3713 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
3714 diffstat_consume, diffstat, &xpp, &xecfg))
3715 die("unable to generate diffstat for %s", one->path);
3716 }
3717
3718 diff_free_filespec_data(one);
3719 diff_free_filespec_data(two);
3720 }
3721
3722 static void builtin_checkdiff(const char *name_a, const char *name_b,
3723 const char *attr_path,
3724 struct diff_filespec *one,
3725 struct diff_filespec *two,
3726 struct diff_options *o)
3727 {
3728 mmfile_t mf1, mf2;
3729 struct checkdiff_t data;
3730
3731 if (!two)
3732 return;
3733
3734 memset(&data, 0, sizeof(data));
3735 data.filename = name_b ? name_b : name_a;
3736 data.lineno = 0;
3737 data.o = o;
3738 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3739 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3740
3741 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3742 fill_mmfile(o->repo, &mf2, two) < 0)
3743 die("unable to read files to diff");
3744
3745 /*
3746 * All the other codepaths check both sides, but not checking
3747 * the "old" side here is deliberate. We are checking the newly
3748 * introduced changes, and as long as the "new" side is text, we
3749 * can and should check what it introduces.
3750 */
3751 if (diff_filespec_is_binary(o->repo, two))
3752 goto free_and_return;
3753 else {
3754 /* Crazy xdl interfaces.. */
3755 xpparam_t xpp;
3756 xdemitconf_t xecfg;
3757
3758 memset(&xpp, 0, sizeof(xpp));
3759 memset(&xecfg, 0, sizeof(xecfg));
3760 xecfg.ctxlen = 1; /* at least one context line */
3761 xpp.flags = 0;
3762 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3763 checkdiff_consume, &data,
3764 &xpp, &xecfg))
3765 die("unable to generate checkdiff for %s", one->path);
3766
3767 if (data.ws_rule & WS_BLANK_AT_EOF) {
3768 struct emit_callback ecbdata;
3769 int blank_at_eof;
3770
3771 ecbdata.ws_rule = data.ws_rule;
3772 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3773 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3774
3775 if (blank_at_eof) {
3776 static char *err;
3777 if (!err)
3778 err = whitespace_error_string(WS_BLANK_AT_EOF);
3779 fprintf(o->file, "%s:%d: %s.\n",
3780 data.filename, blank_at_eof, err);
3781 data.status = 1; /* report errors */
3782 }
3783 }
3784 }
3785 free_and_return:
3786 diff_free_filespec_data(one);
3787 diff_free_filespec_data(two);
3788 if (data.status)
3789 o->flags.check_failed = 1;
3790 }
3791
3792 struct diff_filespec *alloc_filespec(const char *path)
3793 {
3794 struct diff_filespec *spec;
3795
3796 FLEXPTR_ALLOC_STR(spec, path, path);
3797 spec->count = 1;
3798 spec->is_binary = -1;
3799 return spec;
3800 }
3801
3802 void free_filespec(struct diff_filespec *spec)
3803 {
3804 if (!--spec->count) {
3805 diff_free_filespec_data(spec);
3806 free(spec);
3807 }
3808 }
3809
3810 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3811 int oid_valid, unsigned short mode)
3812 {
3813 if (mode) {
3814 spec->mode = canon_mode(mode);
3815 oidcpy(&spec->oid, oid);
3816 spec->oid_valid = oid_valid;
3817 }
3818 }
3819
3820 /*
3821 * Given a name and sha1 pair, if the index tells us the file in
3822 * the work tree has that object contents, return true, so that
3823 * prepare_temp_file() does not have to inflate and extract.
3824 */
3825 static int reuse_worktree_file(struct index_state *istate,
3826 const char *name,
3827 const struct object_id *oid,
3828 int want_file)
3829 {
3830 const struct cache_entry *ce;
3831 struct stat st;
3832 int pos, len;
3833
3834 /*
3835 * We do not read the cache ourselves here, because the
3836 * benchmark with my previous version that always reads cache
3837 * shows that it makes things worse for diff-tree comparing
3838 * two linux-2.6 kernel trees in an already checked out work
3839 * tree. This is because most diff-tree comparisons deal with
3840 * only a small number of files, while reading the cache is
3841 * expensive for a large project, and its cost outweighs the
3842 * savings we get by not inflating the object to a temporary
3843 * file. Practically, this code only helps when we are used
3844 * by diff-cache --cached, which does read the cache before
3845 * calling us.
3846 */
3847 if (!istate->cache)
3848 return 0;
3849
3850 /* We want to avoid the working directory if our caller
3851 * doesn't need the data in a normal file, this system
3852 * is rather slow with its stat/open/mmap/close syscalls,
3853 * and the object is contained in a pack file. The pack
3854 * is probably already open and will be faster to obtain
3855 * the data through than the working directory. Loose
3856 * objects however would tend to be slower as they need
3857 * to be individually opened and inflated.
3858 */
3859 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3860 return 0;
3861
3862 /*
3863 * Similarly, if we'd have to convert the file contents anyway, that
3864 * makes the optimization not worthwhile.
3865 */
3866 if (!want_file && would_convert_to_git(istate, name))
3867 return 0;
3868
3869 len = strlen(name);
3870 pos = index_name_pos(istate, name, len);
3871 if (pos < 0)
3872 return 0;
3873 ce = istate->cache[pos];
3874
3875 /*
3876 * This is not the sha1 we are looking for, or
3877 * unreusable because it is not a regular file.
3878 */
3879 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3880 return 0;
3881
3882 /*
3883 * If ce is marked as "assume unchanged", there is no
3884 * guarantee that work tree matches what we are looking for.
3885 */
3886 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3887 return 0;
3888
3889 /*
3890 * If ce matches the file in the work tree, we can reuse it.
3891 */
3892 if (ce_uptodate(ce) ||
3893 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3894 return 1;
3895
3896 return 0;
3897 }
3898
3899 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3900 {
3901 struct strbuf buf = STRBUF_INIT;
3902 char *dirty = "";
3903
3904 /* Are we looking at the work tree? */
3905 if (s->dirty_submodule)
3906 dirty = "-dirty";
3907
3908 strbuf_addf(&buf, "Subproject commit %s%s\n",
3909 oid_to_hex(&s->oid), dirty);
3910 s->size = buf.len;
3911 if (size_only) {
3912 s->data = NULL;
3913 strbuf_release(&buf);
3914 } else {
3915 s->data = strbuf_detach(&buf, NULL);
3916 s->should_free = 1;
3917 }
3918 return 0;
3919 }
3920
3921 /*
3922 * While doing rename detection and pickaxe operation, we may need to
3923 * grab the data for the blob (or file) for our own in-core comparison.
3924 * diff_filespec has data and size fields for this purpose.
3925 */
3926 int diff_populate_filespec(struct repository *r,
3927 struct diff_filespec *s,
3928 const struct diff_populate_filespec_options *options)
3929 {
3930 int size_only = options ? options->check_size_only : 0;
3931 int check_binary = options ? options->check_binary : 0;
3932 int err = 0;
3933 int conv_flags = global_conv_flags_eol;
3934 /*
3935 * demote FAIL to WARN to allow inspecting the situation
3936 * instead of refusing.
3937 */
3938 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3939 conv_flags = CONV_EOL_RNDTRP_WARN;
3940
3941 if (!DIFF_FILE_VALID(s))
3942 die("internal error: asking to populate invalid file.");
3943 if (S_ISDIR(s->mode))
3944 return -1;
3945
3946 if (s->data)
3947 return 0;
3948
3949 if (size_only && 0 < s->size)
3950 return 0;
3951
3952 if (S_ISGITLINK(s->mode))
3953 return diff_populate_gitlink(s, size_only);
3954
3955 if (!s->oid_valid ||
3956 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3957 struct strbuf buf = STRBUF_INIT;
3958 struct stat st;
3959 int fd;
3960
3961 if (lstat(s->path, &st) < 0) {
3962 err_empty:
3963 err = -1;
3964 empty:
3965 s->data = (char *)"";
3966 s->size = 0;
3967 return err;
3968 }
3969 s->size = xsize_t(st.st_size);
3970 if (!s->size)
3971 goto empty;
3972 if (S_ISLNK(st.st_mode)) {
3973 struct strbuf sb = STRBUF_INIT;
3974
3975 if (strbuf_readlink(&sb, s->path, s->size))
3976 goto err_empty;
3977 s->size = sb.len;
3978 s->data = strbuf_detach(&sb, NULL);
3979 s->should_free = 1;
3980 return 0;
3981 }
3982
3983 /*
3984 * Even if the caller would be happy with getting
3985 * only the size, we cannot return early at this
3986 * point if the path requires us to run the content
3987 * conversion.
3988 */
3989 if (size_only && !would_convert_to_git(r->index, s->path))
3990 return 0;
3991
3992 /*
3993 * Note: this check uses xsize_t(st.st_size) that may
3994 * not be the true size of the blob after it goes
3995 * through convert_to_git(). This may not strictly be
3996 * correct, but the whole point of big_file_threshold
3997 * and is_binary check being that we want to avoid
3998 * opening the file and inspecting the contents, this
3999 * is probably fine.
4000 */
4001 if (check_binary &&
4002 s->size > big_file_threshold && s->is_binary == -1) {
4003 s->is_binary = 1;
4004 return 0;
4005 }
4006 fd = open(s->path, O_RDONLY);
4007 if (fd < 0)
4008 goto err_empty;
4009 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
4010 close(fd);
4011 s->should_munmap = 1;
4012
4013 /*
4014 * Convert from working tree format to canonical git format
4015 */
4016 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
4017 size_t size = 0;
4018 munmap(s->data, s->size);
4019 s->should_munmap = 0;
4020 s->data = strbuf_detach(&buf, &size);
4021 s->size = size;
4022 s->should_free = 1;
4023 }
4024 }
4025 else {
4026 struct object_info info = {
4027 .sizep = &s->size
4028 };
4029
4030 if (!(size_only || check_binary))
4031 /*
4032 * Set contentp, since there is no chance that merely
4033 * the size is sufficient.
4034 */
4035 info.contentp = &s->data;
4036
4037 if (options && options->missing_object_cb) {
4038 if (!oid_object_info_extended(r, &s->oid, &info,
4039 OBJECT_INFO_LOOKUP_REPLACE |
4040 OBJECT_INFO_SKIP_FETCH_OBJECT))
4041 goto object_read;
4042 options->missing_object_cb(options->missing_object_data);
4043 }
4044 if (oid_object_info_extended(r, &s->oid, &info,
4045 OBJECT_INFO_LOOKUP_REPLACE))
4046 die("unable to read %s", oid_to_hex(&s->oid));
4047
4048 object_read:
4049 if (size_only || check_binary) {
4050 if (size_only)
4051 return 0;
4052 if (s->size > big_file_threshold && s->is_binary == -1) {
4053 s->is_binary = 1;
4054 return 0;
4055 }
4056 }
4057 if (!info.contentp) {
4058 info.contentp = &s->data;
4059 if (oid_object_info_extended(r, &s->oid, &info,
4060 OBJECT_INFO_LOOKUP_REPLACE))
4061 die("unable to read %s", oid_to_hex(&s->oid));
4062 }
4063 s->should_free = 1;
4064 }
4065 return 0;
4066 }
4067
4068 void diff_free_filespec_blob(struct diff_filespec *s)
4069 {
4070 if (s->should_free)
4071 free(s->data);
4072 else if (s->should_munmap)
4073 munmap(s->data, s->size);
4074
4075 if (s->should_free || s->should_munmap) {
4076 s->should_free = s->should_munmap = 0;
4077 s->data = NULL;
4078 }
4079 }
4080
4081 void diff_free_filespec_data(struct diff_filespec *s)
4082 {
4083 diff_free_filespec_blob(s);
4084 FREE_AND_NULL(s->cnt_data);
4085 }
4086
4087 static void prep_temp_blob(struct index_state *istate,
4088 const char *path, struct diff_tempfile *temp,
4089 void *blob,
4090 unsigned long size,
4091 const struct object_id *oid,
4092 int mode)
4093 {
4094 struct strbuf buf = STRBUF_INIT;
4095 struct strbuf tempfile = STRBUF_INIT;
4096 char *path_dup = xstrdup(path);
4097 const char *base = basename(path_dup);
4098 struct checkout_metadata meta;
4099
4100 init_checkout_metadata(&meta, NULL, NULL, oid);
4101
4102 /* Generate "XXXXXX_basename.ext" */
4103 strbuf_addstr(&tempfile, "XXXXXX_");
4104 strbuf_addstr(&tempfile, base);
4105
4106 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4107 if (!temp->tempfile)
4108 die_errno("unable to create temp-file");
4109 if (convert_to_working_tree(istate, path,
4110 (const char *)blob, (size_t)size, &buf, &meta)) {
4111 blob = buf.buf;
4112 size = buf.len;
4113 }
4114 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4115 close_tempfile_gently(temp->tempfile))
4116 die_errno("unable to write temp-file");
4117 temp->name = get_tempfile_path(temp->tempfile);
4118 oid_to_hex_r(temp->hex, oid);
4119 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4120 strbuf_release(&buf);
4121 strbuf_release(&tempfile);
4122 free(path_dup);
4123 }
4124
4125 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4126 const char *name,
4127 struct diff_filespec *one)
4128 {
4129 struct diff_tempfile *temp = claim_diff_tempfile();
4130
4131 if (!DIFF_FILE_VALID(one)) {
4132 not_a_valid_file:
4133 /* A '-' entry produces this for file-2, and
4134 * a '+' entry produces this for file-1.
4135 */
4136 temp->name = "/dev/null";
4137 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4138 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4139 return temp;
4140 }
4141
4142 if (!S_ISGITLINK(one->mode) &&
4143 (!one->oid_valid ||
4144 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4145 struct stat st;
4146 if (lstat(name, &st) < 0) {
4147 if (errno == ENOENT)
4148 goto not_a_valid_file;
4149 die_errno("stat(%s)", name);
4150 }
4151 if (S_ISLNK(st.st_mode)) {
4152 struct strbuf sb = STRBUF_INIT;
4153 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4154 die_errno("readlink(%s)", name);
4155 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4156 (one->oid_valid ?
4157 &one->oid : &null_oid),
4158 (one->oid_valid ?
4159 one->mode : S_IFLNK));
4160 strbuf_release(&sb);
4161 }
4162 else {
4163 /* we can borrow from the file in the work tree */
4164 temp->name = name;
4165 if (!one->oid_valid)
4166 oid_to_hex_r(temp->hex, &null_oid);
4167 else
4168 oid_to_hex_r(temp->hex, &one->oid);
4169 /* Even though we may sometimes borrow the
4170 * contents from the work tree, we always want
4171 * one->mode. mode is trustworthy even when
4172 * !(one->oid_valid), as long as
4173 * DIFF_FILE_VALID(one).
4174 */
4175 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4176 }
4177 return temp;
4178 }
4179 else {
4180 if (diff_populate_filespec(r, one, NULL))
4181 die("cannot read data blob for %s", one->path);
4182 prep_temp_blob(r->index, name, temp,
4183 one->data, one->size,
4184 &one->oid, one->mode);
4185 }
4186 return temp;
4187 }
4188
4189 static void add_external_diff_name(struct repository *r,
4190 struct argv_array *argv,
4191 const char *name,
4192 struct diff_filespec *df)
4193 {
4194 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4195 argv_array_push(argv, temp->name);
4196 argv_array_push(argv, temp->hex);
4197 argv_array_push(argv, temp->mode);
4198 }
4199
4200 /* An external diff command takes:
4201 *
4202 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4203 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4204 *
4205 */
4206 static void run_external_diff(const char *pgm,
4207 const char *name,
4208 const char *other,
4209 struct diff_filespec *one,
4210 struct diff_filespec *two,
4211 const char *xfrm_msg,
4212 struct diff_options *o)
4213 {
4214 struct argv_array argv = ARGV_ARRAY_INIT;
4215 struct argv_array env = ARGV_ARRAY_INIT;
4216 struct diff_queue_struct *q = &diff_queued_diff;
4217
4218 argv_array_push(&argv, pgm);
4219 argv_array_push(&argv, name);
4220
4221 if (one && two) {
4222 add_external_diff_name(o->repo, &argv, name, one);
4223 if (!other)
4224 add_external_diff_name(o->repo, &argv, name, two);
4225 else {
4226 add_external_diff_name(o->repo, &argv, other, two);
4227 argv_array_push(&argv, other);
4228 argv_array_push(&argv, xfrm_msg);
4229 }
4230 }
4231
4232 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4233 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4234
4235 diff_free_filespec_data(one);
4236 diff_free_filespec_data(two);
4237 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4238 die(_("external diff died, stopping at %s"), name);
4239
4240 remove_tempfile();
4241 argv_array_clear(&argv);
4242 argv_array_clear(&env);
4243 }
4244
4245 static int similarity_index(struct diff_filepair *p)
4246 {
4247 return p->score * 100 / MAX_SCORE;
4248 }
4249
4250 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4251 {
4252 if (startup_info->have_repository)
4253 return find_unique_abbrev(oid, abbrev);
4254 else {
4255 char *hex = oid_to_hex(oid);
4256 if (abbrev < 0)
4257 abbrev = FALLBACK_DEFAULT_ABBREV;
4258 if (abbrev > the_hash_algo->hexsz)
4259 BUG("oid abbreviation out of range: %d", abbrev);
4260 if (abbrev)
4261 hex[abbrev] = '\0';
4262 return hex;
4263 }
4264 }
4265
4266 static void fill_metainfo(struct strbuf *msg,
4267 const char *name,
4268 const char *other,
4269 struct diff_filespec *one,
4270 struct diff_filespec *two,
4271 struct diff_options *o,
4272 struct diff_filepair *p,
4273 int *must_show_header,
4274 int use_color)
4275 {
4276 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4277 const char *reset = diff_get_color(use_color, DIFF_RESET);
4278 const char *line_prefix = diff_line_prefix(o);
4279
4280 *must_show_header = 1;
4281 strbuf_init(msg, PATH_MAX * 2 + 300);
4282 switch (p->status) {
4283 case DIFF_STATUS_COPIED:
4284 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4285 line_prefix, set, similarity_index(p));
4286 strbuf_addf(msg, "%s\n%s%scopy from ",
4287 reset, line_prefix, set);
4288 quote_c_style(name, msg, NULL, 0);
4289 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4290 quote_c_style(other, msg, NULL, 0);
4291 strbuf_addf(msg, "%s\n", reset);
4292 break;
4293 case DIFF_STATUS_RENAMED:
4294 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4295 line_prefix, set, similarity_index(p));
4296 strbuf_addf(msg, "%s\n%s%srename from ",
4297 reset, line_prefix, set);
4298 quote_c_style(name, msg, NULL, 0);
4299 strbuf_addf(msg, "%s\n%s%srename to ",
4300 reset, line_prefix, set);
4301 quote_c_style(other, msg, NULL, 0);
4302 strbuf_addf(msg, "%s\n", reset);
4303 break;
4304 case DIFF_STATUS_MODIFIED:
4305 if (p->score) {
4306 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4307 line_prefix,
4308 set, similarity_index(p), reset);
4309 break;
4310 }
4311 /* fallthru */
4312 default:
4313 *must_show_header = 0;
4314 }
4315 if (one && two && !oideq(&one->oid, &two->oid)) {
4316 const unsigned hexsz = the_hash_algo->hexsz;
4317 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4318
4319 if (o->flags.binary) {
4320 mmfile_t mf;
4321 if ((!fill_mmfile(o->repo, &mf, one) &&
4322 diff_filespec_is_binary(o->repo, one)) ||
4323 (!fill_mmfile(o->repo, &mf, two) &&
4324 diff_filespec_is_binary(o->repo, two)))
4325 abbrev = hexsz;
4326 }
4327 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4328 diff_abbrev_oid(&one->oid, abbrev),
4329 diff_abbrev_oid(&two->oid, abbrev));
4330 if (one->mode == two->mode)
4331 strbuf_addf(msg, " %06o", one->mode);
4332 strbuf_addf(msg, "%s\n", reset);
4333 }
4334 }
4335
4336 static void run_diff_cmd(const char *pgm,
4337 const char *name,
4338 const char *other,
4339 const char *attr_path,
4340 struct diff_filespec *one,
4341 struct diff_filespec *two,
4342 struct strbuf *msg,
4343 struct diff_options *o,
4344 struct diff_filepair *p)
4345 {
4346 const char *xfrm_msg = NULL;
4347 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4348 int must_show_header = 0;
4349
4350
4351 if (o->flags.allow_external) {
4352 struct userdiff_driver *drv;
4353
4354 drv = userdiff_find_by_path(o->repo->index, attr_path);
4355 if (drv && drv->external)
4356 pgm = drv->external;
4357 }
4358
4359 if (msg) {
4360 /*
4361 * don't use colors when the header is intended for an
4362 * external diff driver
4363 */
4364 fill_metainfo(msg, name, other, one, two, o, p,
4365 &must_show_header,
4366 want_color(o->use_color) && !pgm);
4367 xfrm_msg = msg->len ? msg->buf : NULL;
4368 }
4369
4370 if (pgm) {
4371 run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
4372 return;
4373 }
4374 if (one && two)
4375 builtin_diff(name, other ? other : name,
4376 one, two, xfrm_msg, must_show_header,
4377 o, complete_rewrite);
4378 else
4379 fprintf(o->file, "* Unmerged path %s\n", name);
4380 }
4381
4382 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4383 {
4384 if (DIFF_FILE_VALID(one)) {
4385 if (!one->oid_valid) {
4386 struct stat st;
4387 if (one->is_stdin) {
4388 oidclr(&one->oid);
4389 return;
4390 }
4391 if (lstat(one->path, &st) < 0)
4392 die_errno("stat '%s'", one->path);
4393 if (index_path(istate, &one->oid, one->path, &st, 0))
4394 die("cannot hash %s", one->path);
4395 }
4396 }
4397 else
4398 oidclr(&one->oid);
4399 }
4400
4401 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4402 {
4403 /* Strip the prefix but do not molest /dev/null and absolute paths */
4404 if (*namep && !is_absolute_path(*namep)) {
4405 *namep += prefix_length;
4406 if (**namep == '/')
4407 ++*namep;
4408 }
4409 if (*otherp && !is_absolute_path(*otherp)) {
4410 *otherp += prefix_length;
4411 if (**otherp == '/')
4412 ++*otherp;
4413 }
4414 }
4415
4416 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4417 {
4418 const char *pgm = external_diff();
4419 struct strbuf msg;
4420 struct diff_filespec *one = p->one;
4421 struct diff_filespec *two = p->two;
4422 const char *name;
4423 const char *other;
4424 const char *attr_path;
4425
4426 name = one->path;
4427 other = (strcmp(name, two->path) ? two->path : NULL);
4428 attr_path = name;
4429 if (o->prefix_length)
4430 strip_prefix(o->prefix_length, &name, &other);
4431
4432 if (!o->flags.allow_external)
4433 pgm = NULL;
4434
4435 if (DIFF_PAIR_UNMERGED(p)) {
4436 run_diff_cmd(pgm, name, NULL, attr_path,
4437 NULL, NULL, NULL, o, p);
4438 return;
4439 }
4440
4441 diff_fill_oid_info(one, o->repo->index);
4442 diff_fill_oid_info(two, o->repo->index);
4443
4444 if (!pgm &&
4445 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4446 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4447 /*
4448 * a filepair that changes between file and symlink
4449 * needs to be split into deletion and creation.
4450 */
4451 struct diff_filespec *null = alloc_filespec(two->path);
4452 run_diff_cmd(NULL, name, other, attr_path,
4453 one, null, &msg,
4454 o, p);
4455 free(null);
4456 strbuf_release(&msg);
4457
4458 null = alloc_filespec(one->path);
4459 run_diff_cmd(NULL, name, other, attr_path,
4460 null, two, &msg, o, p);
4461 free(null);
4462 }
4463 else
4464 run_diff_cmd(pgm, name, other, attr_path,
4465 one, two, &msg, o, p);
4466
4467 strbuf_release(&msg);
4468 }
4469
4470 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4471 struct diffstat_t *diffstat)
4472 {
4473 const char *name;
4474 const char *other;
4475
4476 if (DIFF_PAIR_UNMERGED(p)) {
4477 /* unmerged */
4478 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4479 diffstat, o, p);
4480 return;
4481 }
4482
4483 name = p->one->path;
4484 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4485
4486 if (o->prefix_length)
4487 strip_prefix(o->prefix_length, &name, &other);
4488
4489 diff_fill_oid_info(p->one, o->repo->index);
4490 diff_fill_oid_info(p->two, o->repo->index);
4491
4492 builtin_diffstat(name, other, p->one, p->two,
4493 diffstat, o, p);
4494 }
4495
4496 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4497 {
4498 const char *name;
4499 const char *other;
4500 const char *attr_path;
4501
4502 if (DIFF_PAIR_UNMERGED(p)) {
4503 /* unmerged */
4504 return;
4505 }
4506
4507 name = p->one->path;
4508 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4509 attr_path = other ? other : name;
4510
4511 if (o->prefix_length)
4512 strip_prefix(o->prefix_length, &name, &other);
4513
4514 diff_fill_oid_info(p->one, o->repo->index);
4515 diff_fill_oid_info(p->two, o->repo->index);
4516
4517 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4518 }
4519
4520 static void prep_parse_options(struct diff_options *options);
4521
4522 void repo_diff_setup(struct repository *r, struct diff_options *options)
4523 {
4524 memcpy(options, &default_diff_options, sizeof(*options));
4525
4526 options->file = stdout;
4527 options->repo = r;
4528
4529 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4530 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4531 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4532 options->abbrev = DEFAULT_ABBREV;
4533 options->line_termination = '\n';
4534 options->break_opt = -1;
4535 options->rename_limit = -1;
4536 options->dirstat_permille = diff_dirstat_permille_default;
4537 options->context = diff_context_default;
4538 options->interhunkcontext = diff_interhunk_context_default;
4539 options->ws_error_highlight = ws_error_highlight_default;
4540 options->flags.rename_empty = 1;
4541 options->objfind = NULL;
4542
4543 /* pathchange left =NULL by default */
4544 options->change = diff_change;
4545 options->add_remove = diff_addremove;
4546 options->use_color = diff_use_color_default;
4547 options->detect_rename = diff_detect_rename_default;
4548 options->xdl_opts |= diff_algorithm;
4549 if (diff_indent_heuristic)
4550 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4551
4552 options->orderfile = diff_order_file_cfg;
4553
4554 if (diff_no_prefix) {
4555 options->a_prefix = options->b_prefix = "";
4556 } else if (!diff_mnemonic_prefix) {
4557 options->a_prefix = "a/";
4558 options->b_prefix = "b/";
4559 }
4560
4561 options->color_moved = diff_color_moved_default;
4562 options->color_moved_ws_handling = diff_color_moved_ws_default;
4563
4564 prep_parse_options(options);
4565 }
4566
4567 void diff_setup_done(struct diff_options *options)
4568 {
4569 unsigned check_mask = DIFF_FORMAT_NAME |
4570 DIFF_FORMAT_NAME_STATUS |
4571 DIFF_FORMAT_CHECKDIFF |
4572 DIFF_FORMAT_NO_OUTPUT;
4573 /*
4574 * This must be signed because we're comparing against a potentially
4575 * negative value.
4576 */
4577 const int hexsz = the_hash_algo->hexsz;
4578
4579 if (options->set_default)
4580 options->set_default(options);
4581
4582 if (HAS_MULTI_BITS(options->output_format & check_mask))
4583 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4584
4585 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4586 die(_("-G, -S and --find-object are mutually exclusive"));
4587
4588 /*
4589 * Most of the time we can say "there are changes"
4590 * only by checking if there are changed paths, but
4591 * --ignore-whitespace* options force us to look
4592 * inside contents.
4593 */
4594
4595 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4596 options->flags.diff_from_contents = 1;
4597 else
4598 options->flags.diff_from_contents = 0;
4599
4600 if (options->flags.find_copies_harder)
4601 options->detect_rename = DIFF_DETECT_COPY;
4602
4603 if (!options->flags.relative_name)
4604 options->prefix = NULL;
4605 if (options->prefix)
4606 options->prefix_length = strlen(options->prefix);
4607 else
4608 options->prefix_length = 0;
4609
4610 if (options->output_format & (DIFF_FORMAT_NAME |
4611 DIFF_FORMAT_NAME_STATUS |
4612 DIFF_FORMAT_CHECKDIFF |
4613 DIFF_FORMAT_NO_OUTPUT))
4614 options->output_format &= ~(DIFF_FORMAT_RAW |
4615 DIFF_FORMAT_NUMSTAT |
4616 DIFF_FORMAT_DIFFSTAT |
4617 DIFF_FORMAT_SHORTSTAT |
4618 DIFF_FORMAT_DIRSTAT |
4619 DIFF_FORMAT_SUMMARY |
4620 DIFF_FORMAT_PATCH);
4621
4622 /*
4623 * These cases always need recursive; we do not drop caller-supplied
4624 * recursive bits for other formats here.
4625 */
4626 if (options->output_format & (DIFF_FORMAT_PATCH |
4627 DIFF_FORMAT_NUMSTAT |
4628 DIFF_FORMAT_DIFFSTAT |
4629 DIFF_FORMAT_SHORTSTAT |
4630 DIFF_FORMAT_DIRSTAT |
4631 DIFF_FORMAT_SUMMARY |
4632 DIFF_FORMAT_CHECKDIFF))
4633 options->flags.recursive = 1;
4634 /*
4635 * Also pickaxe would not work very well if you do not say recursive
4636 */
4637 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4638 options->flags.recursive = 1;
4639 /*
4640 * When patches are generated, submodules diffed against the work tree
4641 * must be checked for dirtiness too so it can be shown in the output
4642 */
4643 if (options->output_format & DIFF_FORMAT_PATCH)
4644 options->flags.dirty_submodules = 1;
4645
4646 if (options->detect_rename && options->rename_limit < 0)
4647 options->rename_limit = diff_rename_limit_default;
4648 if (hexsz < options->abbrev)
4649 options->abbrev = hexsz; /* full */
4650
4651 /*
4652 * It does not make sense to show the first hit we happened
4653 * to have found. It does not make sense not to return with
4654 * exit code in such a case either.
4655 */
4656 if (options->flags.quick) {
4657 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4658 options->flags.exit_with_status = 1;
4659 }
4660
4661 options->diff_path_counter = 0;
4662
4663 if (options->flags.follow_renames && options->pathspec.nr != 1)
4664 die(_("--follow requires exactly one pathspec"));
4665
4666 if (!options->use_color || external_diff())
4667 options->color_moved = 0;
4668
4669 FREE_AND_NULL(options->parseopts);
4670 }
4671
4672 int parse_long_opt(const char *opt, const char **argv,
4673 const char **optarg)
4674 {
4675 const char *arg = argv[0];
4676 if (!skip_prefix(arg, "--", &arg))
4677 return 0;
4678 if (!skip_prefix(arg, opt, &arg))
4679 return 0;
4680 if (*arg == '=') { /* stuck form: --option=value */
4681 *optarg = arg + 1;
4682 return 1;
4683 }
4684 if (*arg != '\0')
4685 return 0;
4686 /* separate form: --option value */
4687 if (!argv[1])
4688 die("Option '--%s' requires a value", opt);
4689 *optarg = argv[1];
4690 return 2;
4691 }
4692
4693 static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4694 {
4695 struct diff_options *options = opt->value;
4696 int width = options->stat_width;
4697 int name_width = options->stat_name_width;
4698 int graph_width = options->stat_graph_width;
4699 int count = options->stat_count;
4700 char *end;
4701
4702 BUG_ON_OPT_NEG(unset);
4703
4704 if (!strcmp(opt->long_name, "stat")) {
4705 if (value) {
4706 width = strtoul(value, &end, 10);
4707 if (*end == ',')
4708 name_width = strtoul(end+1, &end, 10);
4709 if (*end == ',')
4710 count = strtoul(end+1, &end, 10);
4711 if (*end)
4712 return error(_("invalid --stat value: %s"), value);
4713 }
4714 } else if (!strcmp(opt->long_name, "stat-width")) {
4715 width = strtoul(value, &end, 10);
4716 if (*end)
4717 return error(_("%s expects a numerical value"),
4718 opt->long_name);
4719 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4720 name_width = strtoul(value, &end, 10);
4721 if (*end)
4722 return error(_("%s expects a numerical value"),
4723 opt->long_name);
4724 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4725 graph_width = strtoul(value, &end, 10);
4726 if (*end)
4727 return error(_("%s expects a numerical value"),
4728 opt->long_name);
4729 } else if (!strcmp(opt->long_name, "stat-count")) {
4730 count = strtoul(value, &end, 10);
4731 if (*end)
4732 return error(_("%s expects a numerical value"),
4733 opt->long_name);
4734 } else
4735 BUG("%s should not get here", opt->long_name);
4736
4737 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4738 options->stat_name_width = name_width;
4739 options->stat_graph_width = graph_width;
4740 options->stat_width = width;
4741 options->stat_count = count;
4742 return 0;
4743 }
4744
4745 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4746 {
4747 struct strbuf errmsg = STRBUF_INIT;
4748 if (parse_dirstat_params(options, params, &errmsg))
4749 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4750 errmsg.buf);
4751 strbuf_release(&errmsg);
4752 /*
4753 * The caller knows a dirstat-related option is given from the command
4754 * line; allow it to say "return this_function();"
4755 */
4756 options->output_format |= DIFF_FORMAT_DIRSTAT;
4757 return 1;
4758 }
4759
4760 static const char diff_status_letters[] = {
4761 DIFF_STATUS_ADDED,
4762 DIFF_STATUS_COPIED,
4763 DIFF_STATUS_DELETED,
4764 DIFF_STATUS_MODIFIED,
4765 DIFF_STATUS_RENAMED,
4766 DIFF_STATUS_TYPE_CHANGED,
4767 DIFF_STATUS_UNKNOWN,
4768 DIFF_STATUS_UNMERGED,
4769 DIFF_STATUS_FILTER_AON,
4770 DIFF_STATUS_FILTER_BROKEN,
4771 '\0',
4772 };
4773
4774 static unsigned int filter_bit['Z' + 1];
4775
4776 static void prepare_filter_bits(void)
4777 {
4778 int i;
4779
4780 if (!filter_bit[DIFF_STATUS_ADDED]) {
4781 for (i = 0; diff_status_letters[i]; i++)
4782 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4783 }
4784 }
4785
4786 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4787 {
4788 return opt->filter & filter_bit[(int) status];
4789 }
4790
4791 unsigned diff_filter_bit(char status)
4792 {
4793 prepare_filter_bits();
4794 return filter_bit[(int) status];
4795 }
4796
4797 static int diff_opt_diff_filter(const struct option *option,
4798 const char *optarg, int unset)
4799 {
4800 struct diff_options *opt = option->value;
4801 int i, optch;
4802
4803 BUG_ON_OPT_NEG(unset);
4804 prepare_filter_bits();
4805
4806 /*
4807 * If there is a negation e.g. 'd' in the input, and we haven't
4808 * initialized the filter field with another --diff-filter, start
4809 * from full set of bits, except for AON.
4810 */
4811 if (!opt->filter) {
4812 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4813 if (optch < 'a' || 'z' < optch)
4814 continue;
4815 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4816 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4817 break;
4818 }
4819 }
4820
4821 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4822 unsigned int bit;
4823 int negate;
4824
4825 if ('a' <= optch && optch <= 'z') {
4826 negate = 1;
4827 optch = toupper(optch);
4828 } else {
4829 negate = 0;
4830 }
4831
4832 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4833 if (!bit)
4834 return error(_("unknown change class '%c' in --diff-filter=%s"),
4835 optarg[i], optarg);
4836 if (negate)
4837 opt->filter &= ~bit;
4838 else
4839 opt->filter |= bit;
4840 }
4841 return 0;
4842 }
4843
4844 static void enable_patch_output(int *fmt)
4845 {
4846 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4847 *fmt |= DIFF_FORMAT_PATCH;
4848 }
4849
4850 static int diff_opt_ws_error_highlight(const struct option *option,
4851 const char *arg, int unset)
4852 {
4853 struct diff_options *opt = option->value;
4854 int val = parse_ws_error_highlight(arg);
4855
4856 BUG_ON_OPT_NEG(unset);
4857 if (val < 0)
4858 return error(_("unknown value after ws-error-highlight=%.*s"),
4859 -1 - val, arg);
4860 opt->ws_error_highlight = val;
4861 return 0;
4862 }
4863
4864 static int diff_opt_find_object(const struct option *option,
4865 const char *arg, int unset)
4866 {
4867 struct diff_options *opt = option->value;
4868 struct object_id oid;
4869
4870 BUG_ON_OPT_NEG(unset);
4871 if (get_oid(arg, &oid))
4872 return error(_("unable to resolve '%s'"), arg);
4873
4874 if (!opt->objfind)
4875 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4876
4877 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4878 opt->flags.recursive = 1;
4879 opt->flags.tree_in_recursive = 1;
4880 oidset_insert(opt->objfind, &oid);
4881 return 0;
4882 }
4883
4884 static int diff_opt_anchored(const struct option *opt,
4885 const char *arg, int unset)
4886 {
4887 struct diff_options *options = opt->value;
4888
4889 BUG_ON_OPT_NEG(unset);
4890 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4891 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4892 options->anchors_alloc);
4893 options->anchors[options->anchors_nr++] = xstrdup(arg);
4894 return 0;
4895 }
4896
4897 static int diff_opt_binary(const struct option *opt,
4898 const char *arg, int unset)
4899 {
4900 struct diff_options *options = opt->value;
4901
4902 BUG_ON_OPT_NEG(unset);
4903 BUG_ON_OPT_ARG(arg);
4904 enable_patch_output(&options->output_format);
4905 options->flags.binary = 1;
4906 return 0;
4907 }
4908
4909 static int diff_opt_break_rewrites(const struct option *opt,
4910 const char *arg, int unset)
4911 {
4912 int *break_opt = opt->value;
4913 int opt1, opt2;
4914
4915 BUG_ON_OPT_NEG(unset);
4916 if (!arg)
4917 arg = "";
4918 opt1 = parse_rename_score(&arg);
4919 if (*arg == 0)
4920 opt2 = 0;
4921 else if (*arg != '/')
4922 return error(_("%s expects <n>/<m> form"), opt->long_name);
4923 else {
4924 arg++;
4925 opt2 = parse_rename_score(&arg);
4926 }
4927 if (*arg != 0)
4928 return error(_("%s expects <n>/<m> form"), opt->long_name);
4929 *break_opt = opt1 | (opt2 << 16);
4930 return 0;
4931 }
4932
4933 static int diff_opt_char(const struct option *opt,
4934 const char *arg, int unset)
4935 {
4936 char *value = opt->value;
4937
4938 BUG_ON_OPT_NEG(unset);
4939 if (arg[1])
4940 return error(_("%s expects a character, got '%s'"),
4941 opt->long_name, arg);
4942 *value = arg[0];
4943 return 0;
4944 }
4945
4946 static int diff_opt_color_moved(const struct option *opt,
4947 const char *arg, int unset)
4948 {
4949 struct diff_options *options = opt->value;
4950
4951 if (unset) {
4952 options->color_moved = COLOR_MOVED_NO;
4953 } else if (!arg) {
4954 if (diff_color_moved_default)
4955 options->color_moved = diff_color_moved_default;
4956 if (options->color_moved == COLOR_MOVED_NO)
4957 options->color_moved = COLOR_MOVED_DEFAULT;
4958 } else {
4959 int cm = parse_color_moved(arg);
4960 if (cm < 0)
4961 return error(_("bad --color-moved argument: %s"), arg);
4962 options->color_moved = cm;
4963 }
4964 return 0;
4965 }
4966
4967 static int diff_opt_color_moved_ws(const struct option *opt,
4968 const char *arg, int unset)
4969 {
4970 struct diff_options *options = opt->value;
4971 unsigned cm;
4972
4973 if (unset) {
4974 options->color_moved_ws_handling = 0;
4975 return 0;
4976 }
4977
4978 cm = parse_color_moved_ws(arg);
4979 if (cm & COLOR_MOVED_WS_ERROR)
4980 return error(_("invalid mode '%s' in --color-moved-ws"), arg);
4981 options->color_moved_ws_handling = cm;
4982 return 0;
4983 }
4984
4985 static int diff_opt_color_words(const struct option *opt,
4986 const char *arg, int unset)
4987 {
4988 struct diff_options *options = opt->value;
4989
4990 BUG_ON_OPT_NEG(unset);
4991 options->use_color = 1;
4992 options->word_diff = DIFF_WORDS_COLOR;
4993 options->word_regex = arg;
4994 return 0;
4995 }
4996
4997 static int diff_opt_compact_summary(const struct option *opt,
4998 const char *arg, int unset)
4999 {
5000 struct diff_options *options = opt->value;
5001
5002 BUG_ON_OPT_ARG(arg);
5003 if (unset) {
5004 options->flags.stat_with_summary = 0;
5005 } else {
5006 options->flags.stat_with_summary = 1;
5007 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5008 }
5009 return 0;
5010 }
5011
5012 static int diff_opt_diff_algorithm(const struct option *opt,
5013 const char *arg, int unset)
5014 {
5015 struct diff_options *options = opt->value;
5016 long value = parse_algorithm_value(arg);
5017
5018 BUG_ON_OPT_NEG(unset);
5019 if (value < 0)
5020 return error(_("option diff-algorithm accepts \"myers\", "
5021 "\"minimal\", \"patience\" and \"histogram\""));
5022
5023 /* clear out previous settings */
5024 DIFF_XDL_CLR(options, NEED_MINIMAL);
5025 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5026 options->xdl_opts |= value;
5027 return 0;
5028 }
5029
5030 static int diff_opt_dirstat(const struct option *opt,
5031 const char *arg, int unset)
5032 {
5033 struct diff_options *options = opt->value;
5034
5035 BUG_ON_OPT_NEG(unset);
5036 if (!strcmp(opt->long_name, "cumulative")) {
5037 if (arg)
5038 BUG("how come --cumulative take a value?");
5039 arg = "cumulative";
5040 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
5041 parse_dirstat_opt(options, "files");
5042 parse_dirstat_opt(options, arg ? arg : "");
5043 return 0;
5044 }
5045
5046 static int diff_opt_find_copies(const struct option *opt,
5047 const char *arg, int unset)
5048 {
5049 struct diff_options *options = opt->value;
5050
5051 BUG_ON_OPT_NEG(unset);
5052 if (!arg)
5053 arg = "";
5054 options->rename_score = parse_rename_score(&arg);
5055 if (*arg != 0)
5056 return error(_("invalid argument to %s"), opt->long_name);
5057
5058 if (options->detect_rename == DIFF_DETECT_COPY)
5059 options->flags.find_copies_harder = 1;
5060 else
5061 options->detect_rename = DIFF_DETECT_COPY;
5062
5063 return 0;
5064 }
5065
5066 static int diff_opt_find_renames(const struct option *opt,
5067 const char *arg, int unset)
5068 {
5069 struct diff_options *options = opt->value;
5070
5071 BUG_ON_OPT_NEG(unset);
5072 if (!arg)
5073 arg = "";
5074 options->rename_score = parse_rename_score(&arg);
5075 if (*arg != 0)
5076 return error(_("invalid argument to %s"), opt->long_name);
5077
5078 options->detect_rename = DIFF_DETECT_RENAME;
5079 return 0;
5080 }
5081
5082 static int diff_opt_follow(const struct option *opt,
5083 const char *arg, int unset)
5084 {
5085 struct diff_options *options = opt->value;
5086
5087 BUG_ON_OPT_ARG(arg);
5088 if (unset) {
5089 options->flags.follow_renames = 0;
5090 options->flags.default_follow_renames = 0;
5091 } else {
5092 options->flags.follow_renames = 1;
5093 }
5094 return 0;
5095 }
5096
5097 static int diff_opt_ignore_submodules(const struct option *opt,
5098 const char *arg, int unset)
5099 {
5100 struct diff_options *options = opt->value;
5101
5102 BUG_ON_OPT_NEG(unset);
5103 if (!arg)
5104 arg = "all";
5105 options->flags.override_submodule_config = 1;
5106 handle_ignore_submodules_arg(options, arg);
5107 return 0;
5108 }
5109
5110 static int diff_opt_line_prefix(const struct option *opt,
5111 const char *optarg, int unset)
5112 {
5113 struct diff_options *options = opt->value;
5114
5115 BUG_ON_OPT_NEG(unset);
5116 options->line_prefix = optarg;
5117 options->line_prefix_length = strlen(options->line_prefix);
5118 graph_setup_line_prefix(options);
5119 return 0;
5120 }
5121
5122 static int diff_opt_no_prefix(const struct option *opt,
5123 const char *optarg, int unset)
5124 {
5125 struct diff_options *options = opt->value;
5126
5127 BUG_ON_OPT_NEG(unset);
5128 BUG_ON_OPT_ARG(optarg);
5129 options->a_prefix = "";
5130 options->b_prefix = "";
5131 return 0;
5132 }
5133
5134 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
5135 const struct option *opt,
5136 const char *arg, int unset)
5137 {
5138 struct diff_options *options = opt->value;
5139 char *path;
5140
5141 BUG_ON_OPT_NEG(unset);
5142 path = prefix_filename(ctx->prefix, arg);
5143 options->file = xfopen(path, "w");
5144 options->close_file = 1;
5145 if (options->use_color != GIT_COLOR_ALWAYS)
5146 options->use_color = GIT_COLOR_NEVER;
5147 free(path);
5148 return 0;
5149 }
5150
5151 static int diff_opt_patience(const struct option *opt,
5152 const char *arg, int unset)
5153 {
5154 struct diff_options *options = opt->value;
5155 int i;
5156
5157 BUG_ON_OPT_NEG(unset);
5158 BUG_ON_OPT_ARG(arg);
5159 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5160 /*
5161 * Both --patience and --anchored use PATIENCE_DIFF
5162 * internally, so remove any anchors previously
5163 * specified.
5164 */
5165 for (i = 0; i < options->anchors_nr; i++)
5166 free(options->anchors[i]);
5167 options->anchors_nr = 0;
5168 return 0;
5169 }
5170
5171 static int diff_opt_pickaxe_regex(const struct option *opt,
5172 const char *arg, int unset)
5173 {
5174 struct diff_options *options = opt->value;
5175
5176 BUG_ON_OPT_NEG(unset);
5177 options->pickaxe = arg;
5178 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5179 return 0;
5180 }
5181
5182 static int diff_opt_pickaxe_string(const struct option *opt,
5183 const char *arg, int unset)
5184 {
5185 struct diff_options *options = opt->value;
5186
5187 BUG_ON_OPT_NEG(unset);
5188 options->pickaxe = arg;
5189 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5190 return 0;
5191 }
5192
5193 static int diff_opt_relative(const struct option *opt,
5194 const char *arg, int unset)
5195 {
5196 struct diff_options *options = opt->value;
5197
5198 BUG_ON_OPT_NEG(unset);
5199 options->flags.relative_name = 1;
5200 if (arg)
5201 options->prefix = arg;
5202 return 0;
5203 }
5204
5205 static int diff_opt_submodule(const struct option *opt,
5206 const char *arg, int unset)
5207 {
5208 struct diff_options *options = opt->value;
5209
5210 BUG_ON_OPT_NEG(unset);
5211 if (!arg)
5212 arg = "log";
5213 if (parse_submodule_params(options, arg))
5214 return error(_("failed to parse --submodule option parameter: '%s'"),
5215 arg);
5216 return 0;
5217 }
5218
5219 static int diff_opt_textconv(const struct option *opt,
5220 const char *arg, int unset)
5221 {
5222 struct diff_options *options = opt->value;
5223
5224 BUG_ON_OPT_ARG(arg);
5225 if (unset) {
5226 options->flags.allow_textconv = 0;
5227 } else {
5228 options->flags.allow_textconv = 1;
5229 options->flags.textconv_set_via_cmdline = 1;
5230 }
5231 return 0;
5232 }
5233
5234 static int diff_opt_unified(const struct option *opt,
5235 const char *arg, int unset)
5236 {
5237 struct diff_options *options = opt->value;
5238 char *s;
5239
5240 BUG_ON_OPT_NEG(unset);
5241
5242 if (arg) {
5243 options->context = strtol(arg, &s, 10);
5244 if (*s)
5245 return error(_("%s expects a numerical value"), "--unified");
5246 }
5247 enable_patch_output(&options->output_format);
5248
5249 return 0;
5250 }
5251
5252 static int diff_opt_word_diff(const struct option *opt,
5253 const char *arg, int unset)
5254 {
5255 struct diff_options *options = opt->value;
5256
5257 BUG_ON_OPT_NEG(unset);
5258 if (arg) {
5259 if (!strcmp(arg, "plain"))
5260 options->word_diff = DIFF_WORDS_PLAIN;
5261 else if (!strcmp(arg, "color")) {
5262 options->use_color = 1;
5263 options->word_diff = DIFF_WORDS_COLOR;
5264 }
5265 else if (!strcmp(arg, "porcelain"))
5266 options->word_diff = DIFF_WORDS_PORCELAIN;
5267 else if (!strcmp(arg, "none"))
5268 options->word_diff = DIFF_WORDS_NONE;
5269 else
5270 return error(_("bad --word-diff argument: %s"), arg);
5271 } else {
5272 if (options->word_diff == DIFF_WORDS_NONE)
5273 options->word_diff = DIFF_WORDS_PLAIN;
5274 }
5275 return 0;
5276 }
5277
5278 static int diff_opt_word_diff_regex(const struct option *opt,
5279 const char *arg, int unset)
5280 {
5281 struct diff_options *options = opt->value;
5282
5283 BUG_ON_OPT_NEG(unset);
5284 if (options->word_diff == DIFF_WORDS_NONE)
5285 options->word_diff = DIFF_WORDS_PLAIN;
5286 options->word_regex = arg;
5287 return 0;
5288 }
5289
5290 static void prep_parse_options(struct diff_options *options)
5291 {
5292 struct option parseopts[] = {
5293 OPT_GROUP(N_("Diff output format options")),
5294 OPT_BITOP('p', "patch", &options->output_format,
5295 N_("generate patch"),
5296 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5297 OPT_BIT_F('s', "no-patch", &options->output_format,
5298 N_("suppress diff output"),
5299 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
5300 OPT_BITOP('u', NULL, &options->output_format,
5301 N_("generate patch"),
5302 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5303 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
5304 N_("generate diffs with <n> lines context"),
5305 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
5306 OPT_BOOL('W', "function-context", &options->flags.funccontext,
5307 N_("generate diffs with <n> lines context")),
5308 OPT_BIT_F(0, "raw", &options->output_format,
5309 N_("generate the diff in raw format"),
5310 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
5311 OPT_BITOP(0, "patch-with-raw", &options->output_format,
5312 N_("synonym for '-p --raw'"),
5313 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
5314 DIFF_FORMAT_NO_OUTPUT),
5315 OPT_BITOP(0, "patch-with-stat", &options->output_format,
5316 N_("synonym for '-p --stat'"),
5317 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
5318 DIFF_FORMAT_NO_OUTPUT),
5319 OPT_BIT_F(0, "numstat", &options->output_format,
5320 N_("machine friendly --stat"),
5321 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
5322 OPT_BIT_F(0, "shortstat", &options->output_format,
5323 N_("output only the last line of --stat"),
5324 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
5325 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
5326 N_("output the distribution of relative amount of changes for each sub-directory"),
5327 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5328 diff_opt_dirstat),
5329 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5330 N_("synonym for --dirstat=cumulative"),
5331 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5332 diff_opt_dirstat),
5333 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5334 N_("synonym for --dirstat=files,param1,param2..."),
5335 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5336 diff_opt_dirstat),
5337 OPT_BIT_F(0, "check", &options->output_format,
5338 N_("warn if changes introduce conflict markers or whitespace errors"),
5339 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
5340 OPT_BIT_F(0, "summary", &options->output_format,
5341 N_("condensed summary such as creations, renames and mode changes"),
5342 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
5343 OPT_BIT_F(0, "name-only", &options->output_format,
5344 N_("show only names of changed files"),
5345 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
5346 OPT_BIT_F(0, "name-status", &options->output_format,
5347 N_("show only names and status of changed files"),
5348 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
5349 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5350 N_("generate diffstat"),
5351 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5352 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5353 N_("generate diffstat with a given width"),
5354 PARSE_OPT_NONEG, diff_opt_stat),
5355 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5356 N_("generate diffstat with a given name width"),
5357 PARSE_OPT_NONEG, diff_opt_stat),
5358 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5359 N_("generate diffstat with a given graph width"),
5360 PARSE_OPT_NONEG, diff_opt_stat),
5361 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5362 N_("generate diffstat with limited lines"),
5363 PARSE_OPT_NONEG, diff_opt_stat),
5364 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5365 N_("generate compact summary in diffstat"),
5366 PARSE_OPT_NOARG, diff_opt_compact_summary),
5367 OPT_CALLBACK_F(0, "binary", options, NULL,
5368 N_("output a binary diff that can be applied"),
5369 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
5370 OPT_BOOL(0, "full-index", &options->flags.full_index,
5371 N_("show full pre- and post-image object names on the \"index\" lines")),
5372 OPT_COLOR_FLAG(0, "color", &options->use_color,
5373 N_("show colored diff")),
5374 OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
5375 N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
5376 PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
5377 OPT_SET_INT('z', NULL, &options->line_termination,
5378 N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
5379 0),
5380 OPT__ABBREV(&options->abbrev),
5381 OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
5382 N_("show the given source prefix instead of \"a/\""),
5383 PARSE_OPT_NONEG),
5384 OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
5385 N_("show the given destination prefix instead of \"b/\""),
5386 PARSE_OPT_NONEG),
5387 OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
5388 N_("prepend an additional prefix to every line of output"),
5389 PARSE_OPT_NONEG, diff_opt_line_prefix),
5390 OPT_CALLBACK_F(0, "no-prefix", options, NULL,
5391 N_("do not show any source or destination prefix"),
5392 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
5393 OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
5394 N_("show context between diff hunks up to the specified number of lines"),
5395 PARSE_OPT_NONEG),
5396 OPT_CALLBACK_F(0, "output-indicator-new",
5397 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5398 N_("<char>"),
5399 N_("specify the character to indicate a new line instead of '+'"),
5400 PARSE_OPT_NONEG, diff_opt_char),
5401 OPT_CALLBACK_F(0, "output-indicator-old",
5402 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5403 N_("<char>"),
5404 N_("specify the character to indicate an old line instead of '-'"),
5405 PARSE_OPT_NONEG, diff_opt_char),
5406 OPT_CALLBACK_F(0, "output-indicator-context",
5407 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5408 N_("<char>"),
5409 N_("specify the character to indicate a context instead of ' '"),
5410 PARSE_OPT_NONEG, diff_opt_char),
5411
5412 OPT_GROUP(N_("Diff rename options")),
5413 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5414 N_("break complete rewrite changes into pairs of delete and create"),
5415 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5416 diff_opt_break_rewrites),
5417 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5418 N_("detect renames"),
5419 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5420 diff_opt_find_renames),
5421 OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
5422 N_("omit the preimage for deletes"),
5423 1, PARSE_OPT_NONEG),
5424 OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
5425 N_("detect copies"),
5426 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5427 diff_opt_find_copies),
5428 OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
5429 N_("use unmodified files as source to find copies")),
5430 OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
5431 N_("disable rename detection"),
5432 0, PARSE_OPT_NONEG),
5433 OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
5434 N_("use empty blobs as rename source")),
5435 OPT_CALLBACK_F(0, "follow", options, NULL,
5436 N_("continue listing the history of a file beyond renames"),
5437 PARSE_OPT_NOARG, diff_opt_follow),
5438 OPT_INTEGER('l', NULL, &options->rename_limit,
5439 N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
5440
5441 OPT_GROUP(N_("Diff algorithm options")),
5442 OPT_BIT(0, "minimal", &options->xdl_opts,
5443 N_("produce the smallest possible diff"),
5444 XDF_NEED_MINIMAL),
5445 OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
5446 N_("ignore whitespace when comparing lines"),
5447 XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
5448 OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
5449 N_("ignore changes in amount of whitespace"),
5450 XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
5451 OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
5452 N_("ignore changes in whitespace at EOL"),
5453 XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
5454 OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
5455 N_("ignore carrier-return at the end of line"),
5456 XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
5457 OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
5458 N_("ignore changes whose lines are all blank"),
5459 XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
5460 OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
5461 N_("heuristic to shift diff hunk boundaries for easy reading"),
5462 XDF_INDENT_HEURISTIC),
5463 OPT_CALLBACK_F(0, "patience", options, NULL,
5464 N_("generate diff using the \"patience diff\" algorithm"),
5465 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5466 diff_opt_patience),
5467 OPT_BITOP(0, "histogram", &options->xdl_opts,
5468 N_("generate diff using the \"histogram diff\" algorithm"),
5469 XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
5470 OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
5471 N_("choose a diff algorithm"),
5472 PARSE_OPT_NONEG, diff_opt_diff_algorithm),
5473 OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
5474 N_("generate diff using the \"anchored diff\" algorithm"),
5475 PARSE_OPT_NONEG, diff_opt_anchored),
5476 OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
5477 N_("show word diff, using <mode> to delimit changed words"),
5478 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
5479 OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
5480 N_("use <regex> to decide what a word is"),
5481 PARSE_OPT_NONEG, diff_opt_word_diff_regex),
5482 OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
5483 N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
5484 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
5485 OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
5486 N_("moved lines of code are colored differently"),
5487 PARSE_OPT_OPTARG, diff_opt_color_moved),
5488 OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
5489 N_("how white spaces are ignored in --color-moved"),
5490 0, diff_opt_color_moved_ws),
5491
5492 OPT_GROUP(N_("Other diff options")),
5493 OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
5494 N_("when run from subdir, exclude changes outside and show relative paths"),
5495 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5496 diff_opt_relative),
5497 OPT_BOOL('a', "text", &options->flags.text,
5498 N_("treat all files as text")),
5499 OPT_BOOL('R', NULL, &options->flags.reverse_diff,
5500 N_("swap two inputs, reverse the diff")),
5501 OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
5502 N_("exit with 1 if there were differences, 0 otherwise")),
5503 OPT_BOOL(0, "quiet", &options->flags.quick,
5504 N_("disable all output of the program")),
5505 OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
5506 N_("allow an external diff helper to be executed")),
5507 OPT_CALLBACK_F(0, "textconv", options, NULL,
5508 N_("run external text conversion filters when comparing binary files"),
5509 PARSE_OPT_NOARG, diff_opt_textconv),
5510 OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
5511 N_("ignore changes to submodules in the diff generation"),
5512 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5513 diff_opt_ignore_submodules),
5514 OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
5515 N_("specify how differences in submodules are shown"),
5516 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5517 diff_opt_submodule),
5518 OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
5519 N_("hide 'git add -N' entries from the index"),
5520 1, PARSE_OPT_NONEG),
5521 OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
5522 N_("treat 'git add -N' entries as real in the index"),
5523 0, PARSE_OPT_NONEG),
5524 OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
5525 N_("look for differences that change the number of occurrences of the specified string"),
5526 0, diff_opt_pickaxe_string),
5527 OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
5528 N_("look for differences that change the number of occurrences of the specified regex"),
5529 0, diff_opt_pickaxe_regex),
5530 OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
5531 N_("show all changes in the changeset with -S or -G"),
5532 DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
5533 OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
5534 N_("treat <string> in -S as extended POSIX regular expression"),
5535 DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
5536 OPT_FILENAME('O', NULL, &options->orderfile,
5537 N_("control the order in which files appear in the output")),
5538 OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
5539 N_("look for differences that change the number of occurrences of the specified object"),
5540 PARSE_OPT_NONEG, diff_opt_find_object),
5541 OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
5542 N_("select files by diff type"),
5543 PARSE_OPT_NONEG, diff_opt_diff_filter),
5544 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5545 N_("Output to a specific file"),
5546 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5547
5548 OPT_END()
5549 };
5550
5551 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5552 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5553 }
5554
5555 int diff_opt_parse(struct diff_options *options,
5556 const char **av, int ac, const char *prefix)
5557 {
5558 if (!prefix)
5559 prefix = "";
5560
5561 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5562 PARSE_OPT_KEEP_DASHDASH |
5563 PARSE_OPT_KEEP_UNKNOWN |
5564 PARSE_OPT_NO_INTERNAL_HELP |
5565 PARSE_OPT_ONE_SHOT |
5566 PARSE_OPT_STOP_AT_NON_OPTION);
5567
5568 return ac;
5569 }
5570
5571 int parse_rename_score(const char **cp_p)
5572 {
5573 unsigned long num, scale;
5574 int ch, dot;
5575 const char *cp = *cp_p;
5576
5577 num = 0;
5578 scale = 1;
5579 dot = 0;
5580 for (;;) {
5581 ch = *cp;
5582 if ( !dot && ch == '.' ) {
5583 scale = 1;
5584 dot = 1;
5585 } else if ( ch == '%' ) {
5586 scale = dot ? scale*100 : 100;
5587 cp++; /* % is always at the end */
5588 break;
5589 } else if ( ch >= '0' && ch <= '9' ) {
5590 if ( scale < 100000 ) {
5591 scale *= 10;
5592 num = (num*10) + (ch-'0');
5593 }
5594 } else {
5595 break;
5596 }
5597 cp++;
5598 }
5599 *cp_p = cp;
5600
5601 /* user says num divided by scale and we say internally that
5602 * is MAX_SCORE * num / scale.
5603 */
5604 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5605 }
5606
5607 struct diff_queue_struct diff_queued_diff;
5608
5609 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5610 {
5611 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5612 queue->queue[queue->nr++] = dp;
5613 }
5614
5615 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5616 struct diff_filespec *one,
5617 struct diff_filespec *two)
5618 {
5619 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5620 dp->one = one;
5621 dp->two = two;
5622 if (queue)
5623 diff_q(queue, dp);
5624 return dp;
5625 }
5626
5627 void diff_free_filepair(struct diff_filepair *p)
5628 {
5629 free_filespec(p->one);
5630 free_filespec(p->two);
5631 free(p);
5632 }
5633
5634 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5635 {
5636 int abblen;
5637 const char *abbrev;
5638
5639 /* Do we want all 40 hex characters? */
5640 if (len == the_hash_algo->hexsz)
5641 return oid_to_hex(oid);
5642
5643 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5644 abbrev = diff_abbrev_oid(oid, len);
5645
5646 if (!print_sha1_ellipsis())
5647 return abbrev;
5648
5649 abblen = strlen(abbrev);
5650
5651 /*
5652 * In well-behaved cases, where the abbreviated result is the
5653 * same as the requested length, append three dots after the
5654 * abbreviation (hence the whole logic is limited to the case
5655 * where abblen < 37); when the actual abbreviated result is a
5656 * bit longer than the requested length, we reduce the number
5657 * of dots so that they match the well-behaved ones. However,
5658 * if the actual abbreviation is longer than the requested
5659 * length by more than three, we give up on aligning, and add
5660 * three dots anyway, to indicate that the output is not the
5661 * full object name. Yes, this may be suboptimal, but this
5662 * appears only in "diff --raw --abbrev" output and it is not
5663 * worth the effort to change it now. Note that this would
5664 * likely to work fine when the automatic sizing of default
5665 * abbreviation length is used--we would be fed -1 in "len" in
5666 * that case, and will end up always appending three-dots, but
5667 * the automatic sizing is supposed to give abblen that ensures
5668 * uniqueness across all objects (statistically speaking).
5669 */
5670 if (abblen < the_hash_algo->hexsz - 3) {
5671 static char hex[GIT_MAX_HEXSZ + 1];
5672 if (len < abblen && abblen <= len + 2)
5673 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5674 else
5675 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5676 return hex;
5677 }
5678
5679 return oid_to_hex(oid);
5680 }
5681
5682 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5683 {
5684 int line_termination = opt->line_termination;
5685 int inter_name_termination = line_termination ? '\t' : '\0';
5686
5687 fprintf(opt->file, "%s", diff_line_prefix(opt));
5688 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5689 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5690 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5691 fprintf(opt->file, "%s ",
5692 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5693 }
5694 if (p->score) {
5695 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5696 inter_name_termination);
5697 } else {
5698 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5699 }
5700
5701 if (p->status == DIFF_STATUS_COPIED ||
5702 p->status == DIFF_STATUS_RENAMED) {
5703 const char *name_a, *name_b;
5704 name_a = p->one->path;
5705 name_b = p->two->path;
5706 strip_prefix(opt->prefix_length, &name_a, &name_b);
5707 write_name_quoted(name_a, opt->file, inter_name_termination);
5708 write_name_quoted(name_b, opt->file, line_termination);
5709 } else {
5710 const char *name_a, *name_b;
5711 name_a = p->one->mode ? p->one->path : p->two->path;
5712 name_b = NULL;
5713 strip_prefix(opt->prefix_length, &name_a, &name_b);
5714 write_name_quoted(name_a, opt->file, line_termination);
5715 }
5716 }
5717
5718 int diff_unmodified_pair(struct diff_filepair *p)
5719 {
5720 /* This function is written stricter than necessary to support
5721 * the currently implemented transformers, but the idea is to
5722 * let transformers to produce diff_filepairs any way they want,
5723 * and filter and clean them up here before producing the output.
5724 */
5725 struct diff_filespec *one = p->one, *two = p->two;
5726
5727 if (DIFF_PAIR_UNMERGED(p))
5728 return 0; /* unmerged is interesting */
5729
5730 /* deletion, addition, mode or type change
5731 * and rename are all interesting.
5732 */
5733 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5734 DIFF_PAIR_MODE_CHANGED(p) ||
5735 strcmp(one->path, two->path))
5736 return 0;
5737
5738 /* both are valid and point at the same path. that is, we are
5739 * dealing with a change.
5740 */
5741 if (one->oid_valid && two->oid_valid &&
5742 oideq(&one->oid, &two->oid) &&
5743 !one->dirty_submodule && !two->dirty_submodule)
5744 return 1; /* no change */
5745 if (!one->oid_valid && !two->oid_valid)
5746 return 1; /* both look at the same file on the filesystem. */
5747 return 0;
5748 }
5749
5750 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5751 {
5752 if (diff_unmodified_pair(p))
5753 return;
5754
5755 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5756 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5757 return; /* no tree diffs in patch format */
5758
5759 run_diff(p, o);
5760 }
5761
5762 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5763 struct diffstat_t *diffstat)
5764 {
5765 if (diff_unmodified_pair(p))
5766 return;
5767
5768 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5769 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5770 return; /* no useful stat for tree diffs */
5771
5772 run_diffstat(p, o, diffstat);
5773 }
5774
5775 static void diff_flush_checkdiff(struct diff_filepair *p,
5776 struct diff_options *o)
5777 {
5778 if (diff_unmodified_pair(p))
5779 return;
5780
5781 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5782 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5783 return; /* nothing to check in tree diffs */
5784
5785 run_checkdiff(p, o);
5786 }
5787
5788 int diff_queue_is_empty(void)
5789 {
5790 struct diff_queue_struct *q = &diff_queued_diff;
5791 int i;
5792 for (i = 0; i < q->nr; i++)
5793 if (!diff_unmodified_pair(q->queue[i]))
5794 return 0;
5795 return 1;
5796 }
5797
5798 #if DIFF_DEBUG
5799 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5800 {
5801 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5802 x, one ? one : "",
5803 s->path,
5804 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5805 s->mode,
5806 s->oid_valid ? oid_to_hex(&s->oid) : "");
5807 fprintf(stderr, "queue[%d] %s size %lu\n",
5808 x, one ? one : "",
5809 s->size);
5810 }
5811
5812 void diff_debug_filepair(const struct diff_filepair *p, int i)
5813 {
5814 diff_debug_filespec(p->one, i, "one");
5815 diff_debug_filespec(p->two, i, "two");
5816 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5817 p->score, p->status ? p->status : '?',
5818 p->one->rename_used, p->broken_pair);
5819 }
5820
5821 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5822 {
5823 int i;
5824 if (msg)
5825 fprintf(stderr, "%s\n", msg);
5826 fprintf(stderr, "q->nr = %d\n", q->nr);
5827 for (i = 0; i < q->nr; i++) {
5828 struct diff_filepair *p = q->queue[i];
5829 diff_debug_filepair(p, i);
5830 }
5831 }
5832 #endif
5833
5834 static void diff_resolve_rename_copy(void)
5835 {
5836 int i;
5837 struct diff_filepair *p;
5838 struct diff_queue_struct *q = &diff_queued_diff;
5839
5840 diff_debug_queue("resolve-rename-copy", q);
5841
5842 for (i = 0; i < q->nr; i++) {
5843 p = q->queue[i];
5844 p->status = 0; /* undecided */
5845 if (DIFF_PAIR_UNMERGED(p))
5846 p->status = DIFF_STATUS_UNMERGED;
5847 else if (!DIFF_FILE_VALID(p->one))
5848 p->status = DIFF_STATUS_ADDED;
5849 else if (!DIFF_FILE_VALID(p->two))
5850 p->status = DIFF_STATUS_DELETED;
5851 else if (DIFF_PAIR_TYPE_CHANGED(p))
5852 p->status = DIFF_STATUS_TYPE_CHANGED;
5853
5854 /* from this point on, we are dealing with a pair
5855 * whose both sides are valid and of the same type, i.e.
5856 * either in-place edit or rename/copy edit.
5857 */
5858 else if (DIFF_PAIR_RENAME(p)) {
5859 /*
5860 * A rename might have re-connected a broken
5861 * pair up, causing the pathnames to be the
5862 * same again. If so, that's not a rename at
5863 * all, just a modification..
5864 *
5865 * Otherwise, see if this source was used for
5866 * multiple renames, in which case we decrement
5867 * the count, and call it a copy.
5868 */
5869 if (!strcmp(p->one->path, p->two->path))
5870 p->status = DIFF_STATUS_MODIFIED;
5871 else if (--p->one->rename_used > 0)
5872 p->status = DIFF_STATUS_COPIED;
5873 else
5874 p->status = DIFF_STATUS_RENAMED;
5875 }
5876 else if (!oideq(&p->one->oid, &p->two->oid) ||
5877 p->one->mode != p->two->mode ||
5878 p->one->dirty_submodule ||
5879 p->two->dirty_submodule ||
5880 is_null_oid(&p->one->oid))
5881 p->status = DIFF_STATUS_MODIFIED;
5882 else {
5883 /* This is a "no-change" entry and should not
5884 * happen anymore, but prepare for broken callers.
5885 */
5886 error("feeding unmodified %s to diffcore",
5887 p->one->path);
5888 p->status = DIFF_STATUS_UNKNOWN;
5889 }
5890 }
5891 diff_debug_queue("resolve-rename-copy done", q);
5892 }
5893
5894 static int check_pair_status(struct diff_filepair *p)
5895 {
5896 switch (p->status) {
5897 case DIFF_STATUS_UNKNOWN:
5898 return 0;
5899 case 0:
5900 die("internal error in diff-resolve-rename-copy");
5901 default:
5902 return 1;
5903 }
5904 }
5905
5906 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5907 {
5908 int fmt = opt->output_format;
5909
5910 if (fmt & DIFF_FORMAT_CHECKDIFF)
5911 diff_flush_checkdiff(p, opt);
5912 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5913 diff_flush_raw(p, opt);
5914 else if (fmt & DIFF_FORMAT_NAME) {
5915 const char *name_a, *name_b;
5916 name_a = p->two->path;
5917 name_b = NULL;
5918 strip_prefix(opt->prefix_length, &name_a, &name_b);
5919 fprintf(opt->file, "%s", diff_line_prefix(opt));
5920 write_name_quoted(name_a, opt->file, opt->line_termination);
5921 }
5922 }
5923
5924 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5925 {
5926 struct strbuf sb = STRBUF_INIT;
5927 if (fs->mode)
5928 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5929 else
5930 strbuf_addf(&sb, " %s ", newdelete);
5931
5932 quote_c_style(fs->path, &sb, NULL, 0);
5933 strbuf_addch(&sb, '\n');
5934 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5935 sb.buf, sb.len, 0);
5936 strbuf_release(&sb);
5937 }
5938
5939 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5940 int show_name)
5941 {
5942 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5943 struct strbuf sb = STRBUF_INIT;
5944 strbuf_addf(&sb, " mode change %06o => %06o",
5945 p->one->mode, p->two->mode);
5946 if (show_name) {
5947 strbuf_addch(&sb, ' ');
5948 quote_c_style(p->two->path, &sb, NULL, 0);
5949 }
5950 strbuf_addch(&sb, '\n');
5951 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5952 sb.buf, sb.len, 0);
5953 strbuf_release(&sb);
5954 }
5955 }
5956
5957 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5958 struct diff_filepair *p)
5959 {
5960 struct strbuf sb = STRBUF_INIT;
5961 struct strbuf names = STRBUF_INIT;
5962
5963 pprint_rename(&names, p->one->path, p->two->path);
5964 strbuf_addf(&sb, " %s %s (%d%%)\n",
5965 renamecopy, names.buf, similarity_index(p));
5966 strbuf_release(&names);
5967 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5968 sb.buf, sb.len, 0);
5969 show_mode_change(opt, p, 0);
5970 strbuf_release(&sb);
5971 }
5972
5973 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5974 {
5975 switch(p->status) {
5976 case DIFF_STATUS_DELETED:
5977 show_file_mode_name(opt, "delete", p->one);
5978 break;
5979 case DIFF_STATUS_ADDED:
5980 show_file_mode_name(opt, "create", p->two);
5981 break;
5982 case DIFF_STATUS_COPIED:
5983 show_rename_copy(opt, "copy", p);
5984 break;
5985 case DIFF_STATUS_RENAMED:
5986 show_rename_copy(opt, "rename", p);
5987 break;
5988 default:
5989 if (p->score) {
5990 struct strbuf sb = STRBUF_INIT;
5991 strbuf_addstr(&sb, " rewrite ");
5992 quote_c_style(p->two->path, &sb, NULL, 0);
5993 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5994 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5995 sb.buf, sb.len, 0);
5996 strbuf_release(&sb);
5997 }
5998 show_mode_change(opt, p, !p->score);
5999 break;
6000 }
6001 }
6002
6003 struct patch_id_t {
6004 git_hash_ctx *ctx;
6005 int patchlen;
6006 };
6007
6008 static int remove_space(char *line, int len)
6009 {
6010 int i;
6011 char *dst = line;
6012 unsigned char c;
6013
6014 for (i = 0; i < len; i++)
6015 if (!isspace((c = line[i])))
6016 *dst++ = c;
6017
6018 return dst - line;
6019 }
6020
6021 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
6022 {
6023 unsigned char hash[GIT_MAX_RAWSZ];
6024 unsigned short carry = 0;
6025 int i;
6026
6027 the_hash_algo->final_fn(hash, ctx);
6028 the_hash_algo->init_fn(ctx);
6029 /* 20-byte sum, with carry */
6030 for (i = 0; i < the_hash_algo->rawsz; ++i) {
6031 carry += result->hash[i] + hash[i];
6032 result->hash[i] = carry;
6033 carry >>= 8;
6034 }
6035 }
6036
6037 static void patch_id_consume(void *priv, char *line, unsigned long len)
6038 {
6039 struct patch_id_t *data = priv;
6040 int new_len;
6041
6042 new_len = remove_space(line, len);
6043
6044 the_hash_algo->update_fn(data->ctx, line, new_len);
6045 data->patchlen += new_len;
6046 }
6047
6048 static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
6049 {
6050 the_hash_algo->update_fn(ctx, str, strlen(str));
6051 }
6052
6053 static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
6054 {
6055 /* large enough for 2^32 in octal */
6056 char buf[12];
6057 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
6058 the_hash_algo->update_fn(ctx, buf, len);
6059 }
6060
6061 /* returns 0 upon success, and writes result into oid */
6062 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6063 {
6064 struct diff_queue_struct *q = &diff_queued_diff;
6065 int i;
6066 git_hash_ctx ctx;
6067 struct patch_id_t data;
6068
6069 the_hash_algo->init_fn(&ctx);
6070 memset(&data, 0, sizeof(struct patch_id_t));
6071 data.ctx = &ctx;
6072 oidclr(oid);
6073
6074 for (i = 0; i < q->nr; i++) {
6075 xpparam_t xpp;
6076 xdemitconf_t xecfg;
6077 mmfile_t mf1, mf2;
6078 struct diff_filepair *p = q->queue[i];
6079 int len1, len2;
6080
6081 memset(&xpp, 0, sizeof(xpp));
6082 memset(&xecfg, 0, sizeof(xecfg));
6083 if (p->status == 0)
6084 return error("internal diff status error");
6085 if (p->status == DIFF_STATUS_UNKNOWN)
6086 continue;
6087 if (diff_unmodified_pair(p))
6088 continue;
6089 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
6090 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
6091 continue;
6092 if (DIFF_PAIR_UNMERGED(p))
6093 continue;
6094
6095 diff_fill_oid_info(p->one, options->repo->index);
6096 diff_fill_oid_info(p->two, options->repo->index);
6097
6098 len1 = remove_space(p->one->path, strlen(p->one->path));
6099 len2 = remove_space(p->two->path, strlen(p->two->path));
6100 patch_id_add_string(&ctx, "diff--git");
6101 patch_id_add_string(&ctx, "a/");
6102 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6103 patch_id_add_string(&ctx, "b/");
6104 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6105
6106 if (p->one->mode == 0) {
6107 patch_id_add_string(&ctx, "newfilemode");
6108 patch_id_add_mode(&ctx, p->two->mode);
6109 patch_id_add_string(&ctx, "---/dev/null");
6110 patch_id_add_string(&ctx, "+++b/");
6111 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6112 } else if (p->two->mode == 0) {
6113 patch_id_add_string(&ctx, "deletedfilemode");
6114 patch_id_add_mode(&ctx, p->one->mode);
6115 patch_id_add_string(&ctx, "---a/");
6116 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6117 patch_id_add_string(&ctx, "+++/dev/null");
6118 } else {
6119 patch_id_add_string(&ctx, "---a/");
6120 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6121 patch_id_add_string(&ctx, "+++b/");
6122 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6123 }
6124
6125 if (diff_header_only)
6126 continue;
6127
6128 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
6129 fill_mmfile(options->repo, &mf2, p->two) < 0)
6130 return error("unable to read files to diff");
6131
6132 if (diff_filespec_is_binary(options->repo, p->one) ||
6133 diff_filespec_is_binary(options->repo, p->two)) {
6134 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
6135 the_hash_algo->hexsz);
6136 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
6137 the_hash_algo->hexsz);
6138 continue;
6139 }
6140
6141 xpp.flags = 0;
6142 xecfg.ctxlen = 3;
6143 xecfg.flags = 0;
6144 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
6145 patch_id_consume, &data, &xpp, &xecfg))
6146 return error("unable to generate patch-id diff for %s",
6147 p->one->path);
6148
6149 if (stable)
6150 flush_one_hunk(oid, &ctx);
6151 }
6152
6153 if (!stable)
6154 the_hash_algo->final_fn(oid->hash, &ctx);
6155
6156 return 0;
6157 }
6158
6159 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6160 {
6161 struct diff_queue_struct *q = &diff_queued_diff;
6162 int i;
6163 int result = diff_get_patch_id(options, oid, diff_header_only, stable);
6164
6165 for (i = 0; i < q->nr; i++)
6166 diff_free_filepair(q->queue[i]);
6167
6168 free(q->queue);
6169 DIFF_QUEUE_CLEAR(q);
6170
6171 return result;
6172 }
6173
6174 static int is_summary_empty(const struct diff_queue_struct *q)
6175 {
6176 int i;
6177
6178 for (i = 0; i < q->nr; i++) {
6179 const struct diff_filepair *p = q->queue[i];
6180
6181 switch (p->status) {
6182 case DIFF_STATUS_DELETED:
6183 case DIFF_STATUS_ADDED:
6184 case DIFF_STATUS_COPIED:
6185 case DIFF_STATUS_RENAMED:
6186 return 0;
6187 default:
6188 if (p->score)
6189 return 0;
6190 if (p->one->mode && p->two->mode &&
6191 p->one->mode != p->two->mode)
6192 return 0;
6193 break;
6194 }
6195 }
6196 return 1;
6197 }
6198
6199 static const char rename_limit_warning[] =
6200 N_("inexact rename detection was skipped due to too many files.");
6201
6202 static const char degrade_cc_to_c_warning[] =
6203 N_("only found copies from modified paths due to too many files.");
6204
6205 static const char rename_limit_advice[] =
6206 N_("you may want to set your %s variable to at least "
6207 "%d and retry the command.");
6208
6209 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
6210 {
6211 fflush(stdout);
6212 if (degraded_cc)
6213 warning(_(degrade_cc_to_c_warning));
6214 else if (needed)
6215 warning(_(rename_limit_warning));
6216 else
6217 return;
6218 if (0 < needed)
6219 warning(_(rename_limit_advice), varname, needed);
6220 }
6221
6222 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
6223 {
6224 int i;
6225 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
6226 struct diff_queue_struct *q = &diff_queued_diff;
6227
6228 if (WSEH_NEW & WS_RULE_MASK)
6229 BUG("WS rules bit mask overlaps with diff symbol flags");
6230
6231 if (o->color_moved)
6232 o->emitted_symbols = &esm;
6233
6234 for (i = 0; i < q->nr; i++) {
6235 struct diff_filepair *p = q->queue[i];
6236 if (check_pair_status(p))
6237 diff_flush_patch(p, o);
6238 }
6239
6240 if (o->emitted_symbols) {
6241 if (o->color_moved) {
6242 struct hashmap add_lines, del_lines;
6243
6244 if (o->color_moved_ws_handling &
6245 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
6246 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
6247
6248 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
6249 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
6250
6251 add_lines_to_move_detection(o, &add_lines, &del_lines);
6252 mark_color_as_moved(o, &add_lines, &del_lines);
6253 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6254 dim_moved_lines(o);
6255
6256 hashmap_free_entries(&add_lines, struct moved_entry,
6257 ent);
6258 hashmap_free_entries(&del_lines, struct moved_entry,
6259 ent);
6260 }
6261
6262 for (i = 0; i < esm.nr; i++)
6263 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6264
6265 for (i = 0; i < esm.nr; i++)
6266 free((void *)esm.buf[i].line);
6267 esm.nr = 0;
6268
6269 o->emitted_symbols = NULL;
6270 }
6271 }
6272
6273 void diff_flush(struct diff_options *options)
6274 {
6275 struct diff_queue_struct *q = &diff_queued_diff;
6276 int i, output_format = options->output_format;
6277 int separator = 0;
6278 int dirstat_by_line = 0;
6279
6280 /*
6281 * Order: raw, stat, summary, patch
6282 * or: name/name-status/checkdiff (other bits clear)
6283 */
6284 if (!q->nr)
6285 goto free_queue;
6286
6287 if (output_format & (DIFF_FORMAT_RAW |
6288 DIFF_FORMAT_NAME |
6289 DIFF_FORMAT_NAME_STATUS |
6290 DIFF_FORMAT_CHECKDIFF)) {
6291 for (i = 0; i < q->nr; i++) {
6292 struct diff_filepair *p = q->queue[i];
6293 if (check_pair_status(p))
6294 flush_one_pair(p, options);
6295 }
6296 separator++;
6297 }
6298
6299 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
6300 dirstat_by_line = 1;
6301
6302 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6303 dirstat_by_line) {
6304 struct diffstat_t diffstat;
6305
6306 compute_diffstat(options, &diffstat, q);
6307 if (output_format & DIFF_FORMAT_NUMSTAT)
6308 show_numstat(&diffstat, options);
6309 if (output_format & DIFF_FORMAT_DIFFSTAT)
6310 show_stats(&diffstat, options);
6311 if (output_format & DIFF_FORMAT_SHORTSTAT)
6312 show_shortstats(&diffstat, options);
6313 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
6314 show_dirstat_by_line(&diffstat, options);
6315 free_diffstat_info(&diffstat);
6316 separator++;
6317 }
6318 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
6319 show_dirstat(options);
6320
6321 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
6322 for (i = 0; i < q->nr; i++) {
6323 diff_summary(options, q->queue[i]);
6324 }
6325 separator++;
6326 }
6327
6328 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
6329 options->flags.exit_with_status &&
6330 options->flags.diff_from_contents) {
6331 /*
6332 * run diff_flush_patch for the exit status. setting
6333 * options->file to /dev/null should be safe, because we
6334 * aren't supposed to produce any output anyway.
6335 */
6336 if (options->close_file)
6337 fclose(options->file);
6338 options->file = xfopen("/dev/null", "w");
6339 options->close_file = 1;
6340 options->color_moved = 0;
6341 for (i = 0; i < q->nr; i++) {
6342 struct diff_filepair *p = q->queue[i];
6343 if (check_pair_status(p))
6344 diff_flush_patch(p, options);
6345 if (options->found_changes)
6346 break;
6347 }
6348 }
6349
6350 if (output_format & DIFF_FORMAT_PATCH) {
6351 if (separator) {
6352 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
6353 if (options->stat_sep)
6354 /* attach patch instead of inline */
6355 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6356 NULL, 0, 0);
6357 }
6358
6359 diff_flush_patch_all_file_pairs(options);
6360 }
6361
6362 if (output_format & DIFF_FORMAT_CALLBACK)
6363 options->format_callback(q, options, options->format_callback_data);
6364
6365 for (i = 0; i < q->nr; i++)
6366 diff_free_filepair(q->queue[i]);
6367 free_queue:
6368 free(q->queue);
6369 DIFF_QUEUE_CLEAR(q);
6370 if (options->close_file)
6371 fclose(options->file);
6372
6373 /*
6374 * Report the content-level differences with HAS_CHANGES;
6375 * diff_addremove/diff_change does not set the bit when
6376 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6377 */
6378 if (options->flags.diff_from_contents) {
6379 if (options->found_changes)
6380 options->flags.has_changes = 1;
6381 else
6382 options->flags.has_changes = 0;
6383 }
6384 }
6385
6386 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6387 {
6388 return (((p->status == DIFF_STATUS_MODIFIED) &&
6389 ((p->score &&
6390 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6391 (!p->score &&
6392 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6393 ((p->status != DIFF_STATUS_MODIFIED) &&
6394 filter_bit_tst(p->status, options)));
6395 }
6396
6397 static void diffcore_apply_filter(struct diff_options *options)
6398 {
6399 int i;
6400 struct diff_queue_struct *q = &diff_queued_diff;
6401 struct diff_queue_struct outq;
6402
6403 DIFF_QUEUE_CLEAR(&outq);
6404
6405 if (!options->filter)
6406 return;
6407
6408 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6409 int found;
6410 for (i = found = 0; !found && i < q->nr; i++) {
6411 if (match_filter(options, q->queue[i]))
6412 found++;
6413 }
6414 if (found)
6415 return;
6416
6417 /* otherwise we will clear the whole queue
6418 * by copying the empty outq at the end of this
6419 * function, but first clear the current entries
6420 * in the queue.
6421 */
6422 for (i = 0; i < q->nr; i++)
6423 diff_free_filepair(q->queue[i]);
6424 }
6425 else {
6426 /* Only the matching ones */
6427 for (i = 0; i < q->nr; i++) {
6428 struct diff_filepair *p = q->queue[i];
6429 if (match_filter(options, p))
6430 diff_q(&outq, p);
6431 else
6432 diff_free_filepair(p);
6433 }
6434 }
6435 free(q->queue);
6436 *q = outq;
6437 }
6438
6439 /* Check whether two filespecs with the same mode and size are identical */
6440 static int diff_filespec_is_identical(struct repository *r,
6441 struct diff_filespec *one,
6442 struct diff_filespec *two)
6443 {
6444 if (S_ISGITLINK(one->mode))
6445 return 0;
6446 if (diff_populate_filespec(r, one, NULL))
6447 return 0;
6448 if (diff_populate_filespec(r, two, NULL))
6449 return 0;
6450 return !memcmp(one->data, two->data, one->size);
6451 }
6452
6453 static int diff_filespec_check_stat_unmatch(struct repository *r,
6454 struct diff_filepair *p)
6455 {
6456 struct diff_populate_filespec_options dpf_options = {
6457 .check_size_only = 1,
6458 .missing_object_cb = diff_queued_diff_prefetch,
6459 .missing_object_data = r,
6460 };
6461
6462 if (p->done_skip_stat_unmatch)
6463 return p->skip_stat_unmatch_result;
6464
6465 p->done_skip_stat_unmatch = 1;
6466 p->skip_stat_unmatch_result = 0;
6467 /*
6468 * 1. Entries that come from stat info dirtiness
6469 * always have both sides (iow, not create/delete),
6470 * one side of the object name is unknown, with
6471 * the same mode and size. Keep the ones that
6472 * do not match these criteria. They have real
6473 * differences.
6474 *
6475 * 2. At this point, the file is known to be modified,
6476 * with the same mode and size, and the object
6477 * name of one side is unknown. Need to inspect
6478 * the identical contents.
6479 */
6480 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6481 !DIFF_FILE_VALID(p->two) ||
6482 (p->one->oid_valid && p->two->oid_valid) ||
6483 (p->one->mode != p->two->mode) ||
6484 diff_populate_filespec(r, p->one, &dpf_options) ||
6485 diff_populate_filespec(r, p->two, &dpf_options) ||
6486 (p->one->size != p->two->size) ||
6487 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6488 p->skip_stat_unmatch_result = 1;
6489 return p->skip_stat_unmatch_result;
6490 }
6491
6492 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6493 {
6494 int i;
6495 struct diff_queue_struct *q = &diff_queued_diff;
6496 struct diff_queue_struct outq;
6497 DIFF_QUEUE_CLEAR(&outq);
6498
6499 for (i = 0; i < q->nr; i++) {
6500 struct diff_filepair *p = q->queue[i];
6501
6502 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6503 diff_q(&outq, p);
6504 else {
6505 /*
6506 * The caller can subtract 1 from skip_stat_unmatch
6507 * to determine how many paths were dirty only
6508 * due to stat info mismatch.
6509 */
6510 if (!diffopt->flags.no_index)
6511 diffopt->skip_stat_unmatch++;
6512 diff_free_filepair(p);
6513 }
6514 }
6515 free(q->queue);
6516 *q = outq;
6517 }
6518
6519 static int diffnamecmp(const void *a_, const void *b_)
6520 {
6521 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6522 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6523 const char *name_a, *name_b;
6524
6525 name_a = a->one ? a->one->path : a->two->path;
6526 name_b = b->one ? b->one->path : b->two->path;
6527 return strcmp(name_a, name_b);
6528 }
6529
6530 void diffcore_fix_diff_index(void)
6531 {
6532 struct diff_queue_struct *q = &diff_queued_diff;
6533 QSORT(q->queue, q->nr, diffnamecmp);
6534 }
6535
6536 void diff_add_if_missing(struct repository *r,
6537 struct oid_array *to_fetch,
6538 const struct diff_filespec *filespec)
6539 {
6540 if (filespec && filespec->oid_valid &&
6541 !S_ISGITLINK(filespec->mode) &&
6542 oid_object_info_extended(r, &filespec->oid, NULL,
6543 OBJECT_INFO_FOR_PREFETCH))
6544 oid_array_append(to_fetch, &filespec->oid);
6545 }
6546
6547 void diff_queued_diff_prefetch(void *repository)
6548 {
6549 struct repository *repo = repository;
6550 int i;
6551 struct diff_queue_struct *q = &diff_queued_diff;
6552 struct oid_array to_fetch = OID_ARRAY_INIT;
6553
6554 for (i = 0; i < q->nr; i++) {
6555 struct diff_filepair *p = q->queue[i];
6556 diff_add_if_missing(repo, &to_fetch, p->one);
6557 diff_add_if_missing(repo, &to_fetch, p->two);
6558 }
6559
6560 /*
6561 * NEEDSWORK: Consider deduplicating the OIDs sent.
6562 */
6563 promisor_remote_get_direct(repo, to_fetch.oid, to_fetch.nr);
6564
6565 oid_array_clear(&to_fetch);
6566 }
6567
6568 void diffcore_std(struct diff_options *options)
6569 {
6570 int output_formats_to_prefetch = DIFF_FORMAT_DIFFSTAT |
6571 DIFF_FORMAT_NUMSTAT |
6572 DIFF_FORMAT_PATCH |
6573 DIFF_FORMAT_SHORTSTAT |
6574 DIFF_FORMAT_DIRSTAT;
6575
6576 /*
6577 * Check if the user requested a blob-data-requiring diff output and/or
6578 * break-rewrite detection (which requires blob data). If yes, prefetch
6579 * the diff pairs.
6580 *
6581 * If no prefetching occurs, diffcore_rename() will prefetch if it
6582 * decides that it needs inexact rename detection.
6583 */
6584 if (options->repo == the_repository && has_promisor_remote() &&
6585 (options->output_format & output_formats_to_prefetch ||
6586 options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
6587 diff_queued_diff_prefetch(options->repo);
6588
6589 /* NOTE please keep the following in sync with diff_tree_combined() */
6590 if (options->skip_stat_unmatch)
6591 diffcore_skip_stat_unmatch(options);
6592 if (!options->found_follow) {
6593 /* See try_to_follow_renames() in tree-diff.c */
6594 if (options->break_opt != -1)
6595 diffcore_break(options->repo,
6596 options->break_opt);
6597 if (options->detect_rename)
6598 diffcore_rename(options);
6599 if (options->break_opt != -1)
6600 diffcore_merge_broken();
6601 }
6602 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6603 diffcore_pickaxe(options);
6604 if (options->orderfile)
6605 diffcore_order(options->orderfile);
6606 if (!options->found_follow)
6607 /* See try_to_follow_renames() in tree-diff.c */
6608 diff_resolve_rename_copy();
6609 diffcore_apply_filter(options);
6610
6611 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6612 options->flags.has_changes = 1;
6613 else
6614 options->flags.has_changes = 0;
6615
6616 options->found_follow = 0;
6617 }
6618
6619 int diff_result_code(struct diff_options *opt, int status)
6620 {
6621 int result = 0;
6622
6623 diff_warn_rename_limit("diff.renameLimit",
6624 opt->needed_rename_limit,
6625 opt->degraded_cc_to_c);
6626 if (!opt->flags.exit_with_status &&
6627 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6628 return status;
6629 if (opt->flags.exit_with_status &&
6630 opt->flags.has_changes)
6631 result |= 01;
6632 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6633 opt->flags.check_failed)
6634 result |= 02;
6635 return result;
6636 }
6637
6638 int diff_can_quit_early(struct diff_options *opt)
6639 {
6640 return (opt->flags.quick &&
6641 !opt->filter &&
6642 opt->flags.has_changes);
6643 }
6644
6645 /*
6646 * Shall changes to this submodule be ignored?
6647 *
6648 * Submodule changes can be configured to be ignored separately for each path,
6649 * but that configuration can be overridden from the command line.
6650 */
6651 static int is_submodule_ignored(const char *path, struct diff_options *options)
6652 {
6653 int ignored = 0;
6654 struct diff_flags orig_flags = options->flags;
6655 if (!options->flags.override_submodule_config)
6656 set_diffopt_flags_from_submodule_config(options, path);
6657 if (options->flags.ignore_submodules)
6658 ignored = 1;
6659 options->flags = orig_flags;
6660 return ignored;
6661 }
6662
6663 void compute_diffstat(struct diff_options *options,
6664 struct diffstat_t *diffstat,
6665 struct diff_queue_struct *q)
6666 {
6667 int i;
6668
6669 memset(diffstat, 0, sizeof(struct diffstat_t));
6670 for (i = 0; i < q->nr; i++) {
6671 struct diff_filepair *p = q->queue[i];
6672 if (check_pair_status(p))
6673 diff_flush_stat(p, options, diffstat);
6674 }
6675 }
6676
6677 void diff_addremove(struct diff_options *options,
6678 int addremove, unsigned mode,
6679 const struct object_id *oid,
6680 int oid_valid,
6681 const char *concatpath, unsigned dirty_submodule)
6682 {
6683 struct diff_filespec *one, *two;
6684
6685 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6686 return;
6687
6688 /* This may look odd, but it is a preparation for
6689 * feeding "there are unchanged files which should
6690 * not produce diffs, but when you are doing copy
6691 * detection you would need them, so here they are"
6692 * entries to the diff-core. They will be prefixed
6693 * with something like '=' or '*' (I haven't decided
6694 * which but should not make any difference).
6695 * Feeding the same new and old to diff_change()
6696 * also has the same effect.
6697 * Before the final output happens, they are pruned after
6698 * merged into rename/copy pairs as appropriate.
6699 */
6700 if (options->flags.reverse_diff)
6701 addremove = (addremove == '+' ? '-' :
6702 addremove == '-' ? '+' : addremove);
6703
6704 if (options->prefix &&
6705 strncmp(concatpath, options->prefix, options->prefix_length))
6706 return;
6707
6708 one = alloc_filespec(concatpath);
6709 two = alloc_filespec(concatpath);
6710
6711 if (addremove != '+')
6712 fill_filespec(one, oid, oid_valid, mode);
6713 if (addremove != '-') {
6714 fill_filespec(two, oid, oid_valid, mode);
6715 two->dirty_submodule = dirty_submodule;
6716 }
6717
6718 diff_queue(&diff_queued_diff, one, two);
6719 if (!options->flags.diff_from_contents)
6720 options->flags.has_changes = 1;
6721 }
6722
6723 void diff_change(struct diff_options *options,
6724 unsigned old_mode, unsigned new_mode,
6725 const struct object_id *old_oid,
6726 const struct object_id *new_oid,
6727 int old_oid_valid, int new_oid_valid,
6728 const char *concatpath,
6729 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6730 {
6731 struct diff_filespec *one, *two;
6732 struct diff_filepair *p;
6733
6734 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6735 is_submodule_ignored(concatpath, options))
6736 return;
6737
6738 if (options->flags.reverse_diff) {
6739 SWAP(old_mode, new_mode);
6740 SWAP(old_oid, new_oid);
6741 SWAP(old_oid_valid, new_oid_valid);
6742 SWAP(old_dirty_submodule, new_dirty_submodule);
6743 }
6744
6745 if (options->prefix &&
6746 strncmp(concatpath, options->prefix, options->prefix_length))
6747 return;
6748
6749 one = alloc_filespec(concatpath);
6750 two = alloc_filespec(concatpath);
6751 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6752 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6753 one->dirty_submodule = old_dirty_submodule;
6754 two->dirty_submodule = new_dirty_submodule;
6755 p = diff_queue(&diff_queued_diff, one, two);
6756
6757 if (options->flags.diff_from_contents)
6758 return;
6759
6760 if (options->flags.quick && options->skip_stat_unmatch &&
6761 !diff_filespec_check_stat_unmatch(options->repo, p))
6762 return;
6763
6764 options->flags.has_changes = 1;
6765 }
6766
6767 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6768 {
6769 struct diff_filepair *pair;
6770 struct diff_filespec *one, *two;
6771
6772 if (options->prefix &&
6773 strncmp(path, options->prefix, options->prefix_length))
6774 return NULL;
6775
6776 one = alloc_filespec(path);
6777 two = alloc_filespec(path);
6778 pair = diff_queue(&diff_queued_diff, one, two);
6779 pair->is_unmerged = 1;
6780 return pair;
6781 }
6782
6783 static char *run_textconv(struct repository *r,
6784 const char *pgm,
6785 struct diff_filespec *spec,
6786 size_t *outsize)
6787 {
6788 struct diff_tempfile *temp;
6789 const char *argv[3];
6790 const char **arg = argv;
6791 struct child_process child = CHILD_PROCESS_INIT;
6792 struct strbuf buf = STRBUF_INIT;
6793 int err = 0;
6794
6795 temp = prepare_temp_file(r, spec->path, spec);
6796 *arg++ = pgm;
6797 *arg++ = temp->name;
6798 *arg = NULL;
6799
6800 child.use_shell = 1;
6801 child.argv = argv;
6802 child.out = -1;
6803 if (start_command(&child)) {
6804 remove_tempfile();
6805 return NULL;
6806 }
6807
6808 if (strbuf_read(&buf, child.out, 0) < 0)
6809 err = error("error reading from textconv command '%s'", pgm);
6810 close(child.out);
6811
6812 if (finish_command(&child) || err) {
6813 strbuf_release(&buf);
6814 remove_tempfile();
6815 return NULL;
6816 }
6817 remove_tempfile();
6818
6819 return strbuf_detach(&buf, outsize);
6820 }
6821
6822 size_t fill_textconv(struct repository *r,
6823 struct userdiff_driver *driver,
6824 struct diff_filespec *df,
6825 char **outbuf)
6826 {
6827 size_t size;
6828
6829 if (!driver) {
6830 if (!DIFF_FILE_VALID(df)) {
6831 *outbuf = "";
6832 return 0;
6833 }
6834 if (diff_populate_filespec(r, df, NULL))
6835 die("unable to read files to diff");
6836 *outbuf = df->data;
6837 return df->size;
6838 }
6839
6840 if (!driver->textconv)
6841 BUG("fill_textconv called with non-textconv driver");
6842
6843 if (driver->textconv_cache && df->oid_valid) {
6844 *outbuf = notes_cache_get(driver->textconv_cache,
6845 &df->oid,
6846 &size);
6847 if (*outbuf)
6848 return size;
6849 }
6850
6851 *outbuf = run_textconv(r, driver->textconv, df, &size);
6852 if (!*outbuf)
6853 die("unable to read files to diff");
6854
6855 if (driver->textconv_cache && df->oid_valid) {
6856 /* ignore errors, as we might be in a readonly repository */
6857 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6858 size);
6859 /*
6860 * we could save up changes and flush them all at the end,
6861 * but we would need an extra call after all diffing is done.
6862 * Since generating a cache entry is the slow path anyway,
6863 * this extra overhead probably isn't a big deal.
6864 */
6865 notes_cache_write(driver->textconv_cache);
6866 }
6867
6868 return size;
6869 }
6870
6871 int textconv_object(struct repository *r,
6872 const char *path,
6873 unsigned mode,
6874 const struct object_id *oid,
6875 int oid_valid,
6876 char **buf,
6877 unsigned long *buf_size)
6878 {
6879 struct diff_filespec *df;
6880 struct userdiff_driver *textconv;
6881
6882 df = alloc_filespec(path);
6883 fill_filespec(df, oid, oid_valid, mode);
6884 textconv = get_textconv(r, df);
6885 if (!textconv) {
6886 free_filespec(df);
6887 return 0;
6888 }
6889
6890 *buf_size = fill_textconv(r, textconv, df, buf);
6891 free_filespec(df);
6892 return 1;
6893 }
6894
6895 void setup_diff_pager(struct diff_options *opt)
6896 {
6897 /*
6898 * If the user asked for our exit code, then either they want --quiet
6899 * or --exit-code. We should definitely not bother with a pager in the
6900 * former case, as we will generate no output. Since we still properly
6901 * report our exit code even when a pager is run, we _could_ run a
6902 * pager with --exit-code. But since we have not done so historically,
6903 * and because it is easy to find people oneline advising "git diff
6904 * --exit-code" in hooks and other scripts, we do not do so.
6905 */
6906 if (!opt->flags.exit_with_status &&
6907 check_pager_config("diff") != 0)
6908 setup_pager();
6909 }
The Best VCS Around