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git: update documentation for --git-dir
[git.git] / diff.c
blob8e2914c0312ce7004c6b6ce3ab4b84b846630d65
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 (!strcmp(var, "diff.wserrorhighlight")) {
418 int val = parse_ws_error_highlight(value);
419 if (val < 0)
420 return -1;
421 ws_error_highlight_default = val;
422 return 0;
423 }
424
425 if (git_color_config(var, value, cb) < 0)
426 return -1;
427
428 return git_diff_basic_config(var, value, cb);
429 }
430
431 int git_diff_basic_config(const char *var, const char *value, void *cb)
432 {
433 const char *name;
434
435 if (!strcmp(var, "diff.renamelimit")) {
436 diff_rename_limit_default = git_config_int(var, value);
437 return 0;
438 }
439
440 if (userdiff_config(var, value) < 0)
441 return -1;
442
443 if (skip_prefix(var, "diff.color.", &name) ||
444 skip_prefix(var, "color.diff.", &name)) {
445 int slot = parse_diff_color_slot(name);
446 if (slot < 0)
447 return 0;
448 if (!value)
449 return config_error_nonbool(var);
450 return color_parse(value, diff_colors[slot]);
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, 0))
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 if (!DIFF_FILE_VALID(one))
589 return 0;
590 diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
591 return one->size;
592 }
593
594 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
595 {
596 char *ptr = mf->ptr;
597 long size = mf->size;
598 int cnt = 0;
599
600 if (!size)
601 return cnt;
602 ptr += size - 1; /* pointing at the very end */
603 if (*ptr != '\n')
604 ; /* incomplete line */
605 else
606 ptr--; /* skip the last LF */
607 while (mf->ptr < ptr) {
608 char *prev_eol;
609 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
610 if (*prev_eol == '\n')
611 break;
612 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
613 break;
614 cnt++;
615 ptr = prev_eol - 1;
616 }
617 return cnt;
618 }
619
620 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
621 struct emit_callback *ecbdata)
622 {
623 int l1, l2, at;
624 unsigned ws_rule = ecbdata->ws_rule;
625 l1 = count_trailing_blank(mf1, ws_rule);
626 l2 = count_trailing_blank(mf2, ws_rule);
627 if (l2 <= l1) {
628 ecbdata->blank_at_eof_in_preimage = 0;
629 ecbdata->blank_at_eof_in_postimage = 0;
630 return;
631 }
632 at = count_lines(mf1->ptr, mf1->size);
633 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
634
635 at = count_lines(mf2->ptr, mf2->size);
636 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
637 }
638
639 static void emit_line_0(struct diff_options *o,
640 const char *set_sign, const char *set, unsigned reverse, const char *reset,
641 int first, const char *line, int len)
642 {
643 int has_trailing_newline, has_trailing_carriage_return;
644 int needs_reset = 0; /* at the end of the line */
645 FILE *file = o->file;
646
647 fputs(diff_line_prefix(o), file);
648
649 has_trailing_newline = (len > 0 && line[len-1] == '\n');
650 if (has_trailing_newline)
651 len--;
652
653 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
654 if (has_trailing_carriage_return)
655 len--;
656
657 if (!len && !first)
658 goto end_of_line;
659
660 if (reverse && want_color(o->use_color)) {
661 fputs(GIT_COLOR_REVERSE, file);
662 needs_reset = 1;
663 }
664
665 if (set_sign) {
666 fputs(set_sign, file);
667 needs_reset = 1;
668 }
669
670 if (first)
671 fputc(first, file);
672
673 if (!len)
674 goto end_of_line;
675
676 if (set) {
677 if (set_sign && set != set_sign)
678 fputs(reset, file);
679 fputs(set, file);
680 needs_reset = 1;
681 }
682 fwrite(line, len, 1, file);
683 needs_reset = 1; /* 'line' may contain color codes. */
684
685 end_of_line:
686 if (needs_reset)
687 fputs(reset, file);
688 if (has_trailing_carriage_return)
689 fputc('\r', file);
690 if (has_trailing_newline)
691 fputc('\n', file);
692 }
693
694 static void emit_line(struct diff_options *o, const char *set, const char *reset,
695 const char *line, int len)
696 {
697 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
698 }
699
700 enum diff_symbol {
701 DIFF_SYMBOL_BINARY_DIFF_HEADER,
702 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
703 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
704 DIFF_SYMBOL_BINARY_DIFF_BODY,
705 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
706 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
707 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
708 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
709 DIFF_SYMBOL_STATS_LINE,
710 DIFF_SYMBOL_WORD_DIFF,
711 DIFF_SYMBOL_STAT_SEP,
712 DIFF_SYMBOL_SUMMARY,
713 DIFF_SYMBOL_SUBMODULE_ADD,
714 DIFF_SYMBOL_SUBMODULE_DEL,
715 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
716 DIFF_SYMBOL_SUBMODULE_MODIFIED,
717 DIFF_SYMBOL_SUBMODULE_HEADER,
718 DIFF_SYMBOL_SUBMODULE_ERROR,
719 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
720 DIFF_SYMBOL_REWRITE_DIFF,
721 DIFF_SYMBOL_BINARY_FILES,
722 DIFF_SYMBOL_HEADER,
723 DIFF_SYMBOL_FILEPAIR_PLUS,
724 DIFF_SYMBOL_FILEPAIR_MINUS,
725 DIFF_SYMBOL_WORDS_PORCELAIN,
726 DIFF_SYMBOL_WORDS,
727 DIFF_SYMBOL_CONTEXT,
728 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
729 DIFF_SYMBOL_PLUS,
730 DIFF_SYMBOL_MINUS,
731 DIFF_SYMBOL_NO_LF_EOF,
732 DIFF_SYMBOL_CONTEXT_FRAGINFO,
733 DIFF_SYMBOL_CONTEXT_MARKER,
734 DIFF_SYMBOL_SEPARATOR
735 };
736 /*
737 * Flags for content lines:
738 * 0..12 are whitespace rules
739 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
740 * 16 is marking if the line is blank at EOF
741 */
742 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
743 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
744 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
745 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
746 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
747
748 /*
749 * This struct is used when we need to buffer the output of the diff output.
750 *
751 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
752 * into the pre/post image file. This pointer could be a union with the
753 * line pointer. By storing an offset into the file instead of the literal line,
754 * we can decrease the memory footprint for the buffered output. At first we
755 * may want to only have indirection for the content lines, but we could also
756 * enhance the state for emitting prefabricated lines, e.g. the similarity
757 * score line or hunk/file headers would only need to store a number or path
758 * and then the output can be constructed later on depending on state.
759 */
760 struct emitted_diff_symbol {
761 const char *line;
762 int len;
763 int flags;
764 int indent_off; /* Offset to first non-whitespace character */
765 int indent_width; /* The visual width of the indentation */
766 enum diff_symbol s;
767 };
768 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
769
770 struct emitted_diff_symbols {
771 struct emitted_diff_symbol *buf;
772 int nr, alloc;
773 };
774 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
775
776 static void append_emitted_diff_symbol(struct diff_options *o,
777 struct emitted_diff_symbol *e)
778 {
779 struct emitted_diff_symbol *f;
780
781 ALLOC_GROW(o->emitted_symbols->buf,
782 o->emitted_symbols->nr + 1,
783 o->emitted_symbols->alloc);
784 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
785
786 memcpy(f, e, sizeof(struct emitted_diff_symbol));
787 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
788 }
789
790 struct moved_entry {
791 struct hashmap_entry ent;
792 const struct emitted_diff_symbol *es;
793 struct moved_entry *next_line;
794 };
795
796 struct moved_block {
797 struct moved_entry *match;
798 int wsd; /* The whitespace delta of this block */
799 };
800
801 static void moved_block_clear(struct moved_block *b)
802 {
803 memset(b, 0, sizeof(*b));
804 }
805
806 #define INDENT_BLANKLINE INT_MIN
807
808 static void fill_es_indent_data(struct emitted_diff_symbol *es)
809 {
810 unsigned int off = 0, i;
811 int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
812 const char *s = es->line;
813 const int len = es->len;
814
815 /* skip any \v \f \r at start of indentation */
816 while (s[off] == '\f' || s[off] == '\v' ||
817 (s[off] == '\r' && off < len - 1))
818 off++;
819
820 /* calculate the visual width of indentation */
821 while(1) {
822 if (s[off] == ' ') {
823 width++;
824 off++;
825 } else if (s[off] == '\t') {
826 width += tab_width - (width % tab_width);
827 while (s[++off] == '\t')
828 width += tab_width;
829 } else {
830 break;
831 }
832 }
833
834 /* check if this line is blank */
835 for (i = off; i < len; i++)
836 if (!isspace(s[i]))
837 break;
838
839 if (i == len) {
840 es->indent_width = INDENT_BLANKLINE;
841 es->indent_off = len;
842 } else {
843 es->indent_off = off;
844 es->indent_width = width;
845 }
846 }
847
848 static int compute_ws_delta(const struct emitted_diff_symbol *a,
849 const struct emitted_diff_symbol *b,
850 int *out)
851 {
852 int a_len = a->len,
853 b_len = b->len,
854 a_off = a->indent_off,
855 a_width = a->indent_width,
856 b_off = b->indent_off,
857 b_width = b->indent_width;
858 int delta;
859
860 if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE) {
861 *out = INDENT_BLANKLINE;
862 return 1;
863 }
864
865 if (a->s == DIFF_SYMBOL_PLUS)
866 delta = a_width - b_width;
867 else
868 delta = b_width - a_width;
869
870 if (a_len - a_off != b_len - b_off ||
871 memcmp(a->line + a_off, b->line + b_off, a_len - a_off))
872 return 0;
873
874 *out = delta;
875
876 return 1;
877 }
878
879 static int cmp_in_block_with_wsd(const struct diff_options *o,
880 const struct moved_entry *cur,
881 const struct moved_entry *match,
882 struct moved_block *pmb,
883 int n)
884 {
885 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
886 int al = cur->es->len, bl = match->es->len, cl = l->len;
887 const char *a = cur->es->line,
888 *b = match->es->line,
889 *c = l->line;
890 int a_off = cur->es->indent_off,
891 a_width = cur->es->indent_width,
892 c_off = l->indent_off,
893 c_width = l->indent_width;
894 int delta;
895
896 /*
897 * We need to check if 'cur' is equal to 'match'. As those
898 * are from the same (+/-) side, we do not need to adjust for
899 * indent changes. However these were found using fuzzy
900 * matching so we do have to check if they are equal. Here we
901 * just check the lengths. We delay calling memcmp() to check
902 * the contents until later as if the length comparison for a
903 * and c fails we can avoid the call all together.
904 */
905 if (al != bl)
906 return 1;
907
908 /* If 'l' and 'cur' are both blank then they match. */
909 if (a_width == INDENT_BLANKLINE && c_width == INDENT_BLANKLINE)
910 return 0;
911
912 /*
913 * The indent changes of the block are known and stored in pmb->wsd;
914 * however we need to check if the indent changes of the current line
915 * match those of the current block and that the text of 'l' and 'cur'
916 * after the indentation match.
917 */
918 if (cur->es->s == DIFF_SYMBOL_PLUS)
919 delta = a_width - c_width;
920 else
921 delta = c_width - a_width;
922
923 /*
924 * If the previous lines of this block were all blank then set its
925 * whitespace delta.
926 */
927 if (pmb->wsd == INDENT_BLANKLINE)
928 pmb->wsd = delta;
929
930 return !(delta == pmb->wsd && al - a_off == cl - c_off &&
931 !memcmp(a, b, al) && !
932 memcmp(a + a_off, c + c_off, al - a_off));
933 }
934
935 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
936 const struct hashmap_entry *eptr,
937 const struct hashmap_entry *entry_or_key,
938 const void *keydata)
939 {
940 const struct diff_options *diffopt = hashmap_cmp_fn_data;
941 const struct moved_entry *a, *b;
942 unsigned flags = diffopt->color_moved_ws_handling
943 & XDF_WHITESPACE_FLAGS;
944
945 a = container_of(eptr, const struct moved_entry, ent);
946 b = container_of(entry_or_key, const struct moved_entry, ent);
947
948 if (diffopt->color_moved_ws_handling &
949 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
950 /*
951 * As there is not specific white space config given,
952 * we'd need to check for a new block, so ignore all
953 * white space. The setup of the white space
954 * configuration for the next block is done else where
955 */
956 flags |= XDF_IGNORE_WHITESPACE;
957
958 return !xdiff_compare_lines(a->es->line, a->es->len,
959 b->es->line, b->es->len,
960 flags);
961 }
962
963 static struct moved_entry *prepare_entry(struct diff_options *o,
964 int line_no)
965 {
966 struct moved_entry *ret = xmalloc(sizeof(*ret));
967 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
968 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
969 unsigned int hash = xdiff_hash_string(l->line, l->len, flags);
970
971 hashmap_entry_init(&ret->ent, hash);
972 ret->es = l;
973 ret->next_line = NULL;
974
975 return ret;
976 }
977
978 static void add_lines_to_move_detection(struct diff_options *o,
979 struct hashmap *add_lines,
980 struct hashmap *del_lines)
981 {
982 struct moved_entry *prev_line = NULL;
983
984 int n;
985 for (n = 0; n < o->emitted_symbols->nr; n++) {
986 struct hashmap *hm;
987 struct moved_entry *key;
988
989 switch (o->emitted_symbols->buf[n].s) {
990 case DIFF_SYMBOL_PLUS:
991 hm = add_lines;
992 break;
993 case DIFF_SYMBOL_MINUS:
994 hm = del_lines;
995 break;
996 default:
997 prev_line = NULL;
998 continue;
999 }
1000
1001 if (o->color_moved_ws_handling &
1002 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1003 fill_es_indent_data(&o->emitted_symbols->buf[n]);
1004 key = prepare_entry(o, n);
1005 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
1006 prev_line->next_line = key;
1007
1008 hashmap_add(hm, &key->ent);
1009 prev_line = key;
1010 }
1011 }
1012
1013 static void pmb_advance_or_null(struct diff_options *o,
1014 struct moved_entry *match,
1015 struct hashmap *hm,
1016 struct moved_block *pmb,
1017 int pmb_nr)
1018 {
1019 int i;
1020 for (i = 0; i < pmb_nr; i++) {
1021 struct moved_entry *prev = pmb[i].match;
1022 struct moved_entry *cur = (prev && prev->next_line) ?
1023 prev->next_line : NULL;
1024 if (cur && !hm->cmpfn(o, &cur->ent, &match->ent, NULL)) {
1025 pmb[i].match = cur;
1026 } else {
1027 pmb[i].match = NULL;
1028 }
1029 }
1030 }
1031
1032 static void pmb_advance_or_null_multi_match(struct diff_options *o,
1033 struct moved_entry *match,
1034 struct hashmap *hm,
1035 struct moved_block *pmb,
1036 int pmb_nr, int n)
1037 {
1038 int i;
1039 char *got_match = xcalloc(1, pmb_nr);
1040
1041 hashmap_for_each_entry_from(hm, match, ent) {
1042 for (i = 0; i < pmb_nr; i++) {
1043 struct moved_entry *prev = pmb[i].match;
1044 struct moved_entry *cur = (prev && prev->next_line) ?
1045 prev->next_line : NULL;
1046 if (!cur)
1047 continue;
1048 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
1049 got_match[i] |= 1;
1050 }
1051 }
1052
1053 for (i = 0; i < pmb_nr; i++) {
1054 if (got_match[i]) {
1055 /* Advance to the next line */
1056 pmb[i].match = pmb[i].match->next_line;
1057 } else {
1058 moved_block_clear(&pmb[i]);
1059 }
1060 }
1061
1062 free(got_match);
1063 }
1064
1065 static int shrink_potential_moved_blocks(struct moved_block *pmb,
1066 int pmb_nr)
1067 {
1068 int lp, rp;
1069
1070 /* Shrink the set of potential block to the remaining running */
1071 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
1072 while (lp < pmb_nr && pmb[lp].match)
1073 lp++;
1074 /* lp points at the first NULL now */
1075
1076 while (rp > -1 && !pmb[rp].match)
1077 rp--;
1078 /* rp points at the last non-NULL */
1079
1080 if (lp < pmb_nr && rp > -1 && lp < rp) {
1081 pmb[lp] = pmb[rp];
1082 memset(&pmb[rp], 0, sizeof(pmb[rp]));
1083 rp--;
1084 lp++;
1085 }
1086 }
1087
1088 /* Remember the number of running sets */
1089 return rp + 1;
1090 }
1091
1092 /*
1093 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1094 *
1095 * Otherwise, if the last block has fewer alphanumeric characters than
1096 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1097 * that block.
1098 *
1099 * The last block consists of the (n - block_length)'th line up to but not
1100 * including the nth line.
1101 *
1102 * Returns 0 if the last block is empty or is unset by this function, non zero
1103 * otherwise.
1104 *
1105 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1106 * Think of a way to unify them.
1107 */
1108 static int adjust_last_block(struct diff_options *o, int n, int block_length)
1109 {
1110 int i, alnum_count = 0;
1111 if (o->color_moved == COLOR_MOVED_PLAIN)
1112 return block_length;
1113 for (i = 1; i < block_length + 1; i++) {
1114 const char *c = o->emitted_symbols->buf[n - i].line;
1115 for (; *c; c++) {
1116 if (!isalnum(*c))
1117 continue;
1118 alnum_count++;
1119 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1120 return 1;
1121 }
1122 }
1123 for (i = 1; i < block_length + 1; i++)
1124 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1125 return 0;
1126 }
1127
1128 /* Find blocks of moved code, delegate actual coloring decision to helper */
1129 static void mark_color_as_moved(struct diff_options *o,
1130 struct hashmap *add_lines,
1131 struct hashmap *del_lines)
1132 {
1133 struct moved_block *pmb = NULL; /* potentially moved blocks */
1134 int pmb_nr = 0, pmb_alloc = 0;
1135 int n, flipped_block = 0, block_length = 0;
1136
1137
1138 for (n = 0; n < o->emitted_symbols->nr; n++) {
1139 struct hashmap *hm = NULL;
1140 struct moved_entry *key;
1141 struct moved_entry *match = NULL;
1142 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1143 enum diff_symbol last_symbol = 0;
1144
1145 switch (l->s) {
1146 case DIFF_SYMBOL_PLUS:
1147 hm = del_lines;
1148 key = prepare_entry(o, n);
1149 match = hashmap_get_entry(hm, key, ent, NULL);
1150 free(key);
1151 break;
1152 case DIFF_SYMBOL_MINUS:
1153 hm = add_lines;
1154 key = prepare_entry(o, n);
1155 match = hashmap_get_entry(hm, key, ent, NULL);
1156 free(key);
1157 break;
1158 default:
1159 flipped_block = 0;
1160 }
1161
1162 if (!match) {
1163 int i;
1164
1165 adjust_last_block(o, n, block_length);
1166 for(i = 0; i < pmb_nr; i++)
1167 moved_block_clear(&pmb[i]);
1168 pmb_nr = 0;
1169 block_length = 0;
1170 flipped_block = 0;
1171 last_symbol = l->s;
1172 continue;
1173 }
1174
1175 if (o->color_moved == COLOR_MOVED_PLAIN) {
1176 last_symbol = l->s;
1177 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1178 continue;
1179 }
1180
1181 if (o->color_moved_ws_handling &
1182 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1183 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1184 else
1185 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1186
1187 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1188
1189 if (pmb_nr == 0) {
1190 /*
1191 * The current line is the start of a new block.
1192 * Setup the set of potential blocks.
1193 */
1194 hashmap_for_each_entry_from(hm, match, ent) {
1195 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1196 if (o->color_moved_ws_handling &
1197 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1198 if (compute_ws_delta(l, match->es,
1199 &pmb[pmb_nr].wsd))
1200 pmb[pmb_nr++].match = match;
1201 } else {
1202 pmb[pmb_nr].wsd = 0;
1203 pmb[pmb_nr++].match = match;
1204 }
1205 }
1206
1207 if (adjust_last_block(o, n, block_length) &&
1208 pmb_nr && last_symbol != l->s)
1209 flipped_block = (flipped_block + 1) % 2;
1210 else
1211 flipped_block = 0;
1212
1213 block_length = 0;
1214 }
1215
1216 if (pmb_nr) {
1217 block_length++;
1218 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1219 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1220 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1221 }
1222 last_symbol = l->s;
1223 }
1224 adjust_last_block(o, n, block_length);
1225
1226 for(n = 0; n < pmb_nr; n++)
1227 moved_block_clear(&pmb[n]);
1228 free(pmb);
1229 }
1230
1231 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1232 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1233 static void dim_moved_lines(struct diff_options *o)
1234 {
1235 int n;
1236 for (n = 0; n < o->emitted_symbols->nr; n++) {
1237 struct emitted_diff_symbol *prev = (n != 0) ?
1238 &o->emitted_symbols->buf[n - 1] : NULL;
1239 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1240 struct emitted_diff_symbol *next =
1241 (n < o->emitted_symbols->nr - 1) ?
1242 &o->emitted_symbols->buf[n + 1] : NULL;
1243
1244 /* Not a plus or minus line? */
1245 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1246 continue;
1247
1248 /* Not a moved line? */
1249 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1250 continue;
1251
1252 /*
1253 * If prev or next are not a plus or minus line,
1254 * pretend they don't exist
1255 */
1256 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1257 prev->s != DIFF_SYMBOL_MINUS)
1258 prev = NULL;
1259 if (next && next->s != DIFF_SYMBOL_PLUS &&
1260 next->s != DIFF_SYMBOL_MINUS)
1261 next = NULL;
1262
1263 /* Inside a block? */
1264 if ((prev &&
1265 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1266 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1267 (next &&
1268 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1269 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1270 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1271 continue;
1272 }
1273
1274 /* Check if we are at an interesting bound: */
1275 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1276 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1277 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1278 continue;
1279 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1280 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1281 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1282 continue;
1283
1284 /*
1285 * The boundary to prev and next are not interesting,
1286 * so this line is not interesting as a whole
1287 */
1288 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1289 }
1290 }
1291
1292 static void emit_line_ws_markup(struct diff_options *o,
1293 const char *set_sign, const char *set,
1294 const char *reset,
1295 int sign_index, const char *line, int len,
1296 unsigned ws_rule, int blank_at_eof)
1297 {
1298 const char *ws = NULL;
1299 int sign = o->output_indicators[sign_index];
1300
1301 if (o->ws_error_highlight & ws_rule) {
1302 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1303 if (!*ws)
1304 ws = NULL;
1305 }
1306
1307 if (!ws && !set_sign)
1308 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1309 else if (!ws) {
1310 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1311 } else if (blank_at_eof)
1312 /* Blank line at EOF - paint '+' as well */
1313 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1314 else {
1315 /* Emit just the prefix, then the rest. */
1316 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1317 sign, "", 0);
1318 ws_check_emit(line, len, ws_rule,
1319 o->file, set, reset, ws);
1320 }
1321 }
1322
1323 static void emit_diff_symbol_from_struct(struct diff_options *o,
1324 struct emitted_diff_symbol *eds)
1325 {
1326 static const char *nneof = " No newline at end of file\n";
1327 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1328 struct strbuf sb = STRBUF_INIT;
1329
1330 enum diff_symbol s = eds->s;
1331 const char *line = eds->line;
1332 int len = eds->len;
1333 unsigned flags = eds->flags;
1334
1335 switch (s) {
1336 case DIFF_SYMBOL_NO_LF_EOF:
1337 context = diff_get_color_opt(o, DIFF_CONTEXT);
1338 reset = diff_get_color_opt(o, DIFF_RESET);
1339 putc('\n', o->file);
1340 emit_line_0(o, context, NULL, 0, reset, '\\',
1341 nneof, strlen(nneof));
1342 break;
1343 case DIFF_SYMBOL_SUBMODULE_HEADER:
1344 case DIFF_SYMBOL_SUBMODULE_ERROR:
1345 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1346 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1347 case DIFF_SYMBOL_SUMMARY:
1348 case DIFF_SYMBOL_STATS_LINE:
1349 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1350 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1351 emit_line(o, "", "", line, len);
1352 break;
1353 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1354 case DIFF_SYMBOL_CONTEXT_MARKER:
1355 context = diff_get_color_opt(o, DIFF_CONTEXT);
1356 reset = diff_get_color_opt(o, DIFF_RESET);
1357 emit_line(o, context, reset, line, len);
1358 break;
1359 case DIFF_SYMBOL_SEPARATOR:
1360 fprintf(o->file, "%s%c",
1361 diff_line_prefix(o),
1362 o->line_termination);
1363 break;
1364 case DIFF_SYMBOL_CONTEXT:
1365 set = diff_get_color_opt(o, DIFF_CONTEXT);
1366 reset = diff_get_color_opt(o, DIFF_RESET);
1367 set_sign = NULL;
1368 if (o->flags.dual_color_diffed_diffs) {
1369 char c = !len ? 0 : line[0];
1370
1371 if (c == '+')
1372 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1373 else if (c == '@')
1374 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1375 else if (c == '-')
1376 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1377 }
1378 emit_line_ws_markup(o, set_sign, set, reset,
1379 OUTPUT_INDICATOR_CONTEXT, line, len,
1380 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1381 break;
1382 case DIFF_SYMBOL_PLUS:
1383 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1384 DIFF_SYMBOL_MOVED_LINE_ALT |
1385 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1386 case DIFF_SYMBOL_MOVED_LINE |
1387 DIFF_SYMBOL_MOVED_LINE_ALT |
1388 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1389 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1390 break;
1391 case DIFF_SYMBOL_MOVED_LINE |
1392 DIFF_SYMBOL_MOVED_LINE_ALT:
1393 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1394 break;
1395 case DIFF_SYMBOL_MOVED_LINE |
1396 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1397 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1398 break;
1399 case DIFF_SYMBOL_MOVED_LINE:
1400 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1401 break;
1402 default:
1403 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1404 }
1405 reset = diff_get_color_opt(o, DIFF_RESET);
1406 if (!o->flags.dual_color_diffed_diffs)
1407 set_sign = NULL;
1408 else {
1409 char c = !len ? 0 : line[0];
1410
1411 set_sign = set;
1412 if (c == '-')
1413 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1414 else if (c == '@')
1415 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1416 else if (c == '+')
1417 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1418 else
1419 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1420 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1421 }
1422 emit_line_ws_markup(o, set_sign, set, reset,
1423 OUTPUT_INDICATOR_NEW, line, len,
1424 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1425 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1426 break;
1427 case DIFF_SYMBOL_MINUS:
1428 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1429 DIFF_SYMBOL_MOVED_LINE_ALT |
1430 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1431 case DIFF_SYMBOL_MOVED_LINE |
1432 DIFF_SYMBOL_MOVED_LINE_ALT |
1433 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1434 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1435 break;
1436 case DIFF_SYMBOL_MOVED_LINE |
1437 DIFF_SYMBOL_MOVED_LINE_ALT:
1438 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1439 break;
1440 case DIFF_SYMBOL_MOVED_LINE |
1441 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1442 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1443 break;
1444 case DIFF_SYMBOL_MOVED_LINE:
1445 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1446 break;
1447 default:
1448 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1449 }
1450 reset = diff_get_color_opt(o, DIFF_RESET);
1451 if (!o->flags.dual_color_diffed_diffs)
1452 set_sign = NULL;
1453 else {
1454 char c = !len ? 0 : line[0];
1455
1456 set_sign = set;
1457 if (c == '+')
1458 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1459 else if (c == '@')
1460 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1461 else if (c == '-')
1462 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1463 else
1464 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1465 }
1466 emit_line_ws_markup(o, set_sign, set, reset,
1467 OUTPUT_INDICATOR_OLD, line, len,
1468 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1469 break;
1470 case DIFF_SYMBOL_WORDS_PORCELAIN:
1471 context = diff_get_color_opt(o, DIFF_CONTEXT);
1472 reset = diff_get_color_opt(o, DIFF_RESET);
1473 emit_line(o, context, reset, line, len);
1474 fputs("~\n", o->file);
1475 break;
1476 case DIFF_SYMBOL_WORDS:
1477 context = diff_get_color_opt(o, DIFF_CONTEXT);
1478 reset = diff_get_color_opt(o, DIFF_RESET);
1479 /*
1480 * Skip the prefix character, if any. With
1481 * diff_suppress_blank_empty, there may be
1482 * none.
1483 */
1484 if (line[0] != '\n') {
1485 line++;
1486 len--;
1487 }
1488 emit_line(o, context, reset, line, len);
1489 break;
1490 case DIFF_SYMBOL_FILEPAIR_PLUS:
1491 meta = diff_get_color_opt(o, DIFF_METAINFO);
1492 reset = diff_get_color_opt(o, DIFF_RESET);
1493 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1494 line, reset,
1495 strchr(line, ' ') ? "\t" : "");
1496 break;
1497 case DIFF_SYMBOL_FILEPAIR_MINUS:
1498 meta = diff_get_color_opt(o, DIFF_METAINFO);
1499 reset = diff_get_color_opt(o, DIFF_RESET);
1500 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1501 line, reset,
1502 strchr(line, ' ') ? "\t" : "");
1503 break;
1504 case DIFF_SYMBOL_BINARY_FILES:
1505 case DIFF_SYMBOL_HEADER:
1506 fprintf(o->file, "%s", line);
1507 break;
1508 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1509 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1510 break;
1511 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1512 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1513 break;
1514 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1515 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1516 break;
1517 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1518 fputs(diff_line_prefix(o), o->file);
1519 fputc('\n', o->file);
1520 break;
1521 case DIFF_SYMBOL_REWRITE_DIFF:
1522 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1523 reset = diff_get_color_opt(o, DIFF_RESET);
1524 emit_line(o, fraginfo, reset, line, len);
1525 break;
1526 case DIFF_SYMBOL_SUBMODULE_ADD:
1527 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1528 reset = diff_get_color_opt(o, DIFF_RESET);
1529 emit_line(o, set, reset, line, len);
1530 break;
1531 case DIFF_SYMBOL_SUBMODULE_DEL:
1532 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1533 reset = diff_get_color_opt(o, DIFF_RESET);
1534 emit_line(o, set, reset, line, len);
1535 break;
1536 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1537 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1538 diff_line_prefix(o), line);
1539 break;
1540 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1541 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1542 diff_line_prefix(o), line);
1543 break;
1544 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1545 emit_line(o, "", "", " 0 files changed\n",
1546 strlen(" 0 files changed\n"));
1547 break;
1548 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1549 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1550 break;
1551 case DIFF_SYMBOL_WORD_DIFF:
1552 fprintf(o->file, "%.*s", len, line);
1553 break;
1554 case DIFF_SYMBOL_STAT_SEP:
1555 fputs(o->stat_sep, o->file);
1556 break;
1557 default:
1558 BUG("unknown diff symbol");
1559 }
1560 strbuf_release(&sb);
1561 }
1562
1563 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1564 const char *line, int len, unsigned flags)
1565 {
1566 struct emitted_diff_symbol e = {line, len, flags, 0, 0, s};
1567
1568 if (o->emitted_symbols)
1569 append_emitted_diff_symbol(o, &e);
1570 else
1571 emit_diff_symbol_from_struct(o, &e);
1572 }
1573
1574 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1575 {
1576 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1577 }
1578
1579 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1580 {
1581 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1582 }
1583
1584 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1585 {
1586 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1587 path, strlen(path), 0);
1588 }
1589
1590 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1591 {
1592 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1593 path, strlen(path), 0);
1594 }
1595
1596 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1597 {
1598 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1599 header, strlen(header), 0);
1600 }
1601
1602 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1603 {
1604 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1605 }
1606
1607 void diff_emit_submodule_pipethrough(struct diff_options *o,
1608 const char *line, int len)
1609 {
1610 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1611 }
1612
1613 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1614 {
1615 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1616 ecbdata->blank_at_eof_in_preimage &&
1617 ecbdata->blank_at_eof_in_postimage &&
1618 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1619 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1620 return 0;
1621 return ws_blank_line(line, len, ecbdata->ws_rule);
1622 }
1623
1624 static void emit_add_line(struct emit_callback *ecbdata,
1625 const char *line, int len)
1626 {
1627 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1628 if (new_blank_line_at_eof(ecbdata, line, len))
1629 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1630
1631 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1632 }
1633
1634 static void emit_del_line(struct emit_callback *ecbdata,
1635 const char *line, int len)
1636 {
1637 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1638 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1639 }
1640
1641 static void emit_context_line(struct emit_callback *ecbdata,
1642 const char *line, int len)
1643 {
1644 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1645 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1646 }
1647
1648 static void emit_hunk_header(struct emit_callback *ecbdata,
1649 const char *line, int len)
1650 {
1651 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1652 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1653 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1654 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1655 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1656 static const char atat[2] = { '@', '@' };
1657 const char *cp, *ep;
1658 struct strbuf msgbuf = STRBUF_INIT;
1659 int org_len = len;
1660 int i = 1;
1661
1662 /*
1663 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1664 * it always is at least 10 bytes long.
1665 */
1666 if (len < 10 ||
1667 memcmp(line, atat, 2) ||
1668 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1669 emit_diff_symbol(ecbdata->opt,
1670 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1671 return;
1672 }
1673 ep += 2; /* skip over @@ */
1674
1675 /* The hunk header in fraginfo color */
1676 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1677 strbuf_addstr(&msgbuf, reverse);
1678 strbuf_addstr(&msgbuf, frag);
1679 if (ecbdata->opt->flags.suppress_hunk_header_line_count)
1680 strbuf_add(&msgbuf, atat, sizeof(atat));
1681 else
1682 strbuf_add(&msgbuf, line, ep - line);
1683 strbuf_addstr(&msgbuf, reset);
1684
1685 /*
1686 * trailing "\r\n"
1687 */
1688 for ( ; i < 3; i++)
1689 if (line[len - i] == '\r' || line[len - i] == '\n')
1690 len--;
1691
1692 /* blank before the func header */
1693 for (cp = ep; ep - line < len; ep++)
1694 if (*ep != ' ' && *ep != '\t')
1695 break;
1696 if (ep != cp) {
1697 strbuf_addstr(&msgbuf, context);
1698 strbuf_add(&msgbuf, cp, ep - cp);
1699 strbuf_addstr(&msgbuf, reset);
1700 }
1701
1702 if (ep < line + len) {
1703 strbuf_addstr(&msgbuf, func);
1704 strbuf_add(&msgbuf, ep, line + len - ep);
1705 strbuf_addstr(&msgbuf, reset);
1706 }
1707
1708 strbuf_add(&msgbuf, line + len, org_len - len);
1709 strbuf_complete_line(&msgbuf);
1710 emit_diff_symbol(ecbdata->opt,
1711 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1712 strbuf_release(&msgbuf);
1713 }
1714
1715 static struct diff_tempfile *claim_diff_tempfile(void)
1716 {
1717 int i;
1718 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1719 if (!diff_temp[i].name)
1720 return diff_temp + i;
1721 BUG("diff is failing to clean up its tempfiles");
1722 }
1723
1724 static void remove_tempfile(void)
1725 {
1726 int i;
1727 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1728 if (is_tempfile_active(diff_temp[i].tempfile))
1729 delete_tempfile(&diff_temp[i].tempfile);
1730 diff_temp[i].name = NULL;
1731 }
1732 }
1733
1734 static void add_line_count(struct strbuf *out, int count)
1735 {
1736 switch (count) {
1737 case 0:
1738 strbuf_addstr(out, "0,0");
1739 break;
1740 case 1:
1741 strbuf_addstr(out, "1");
1742 break;
1743 default:
1744 strbuf_addf(out, "1,%d", count);
1745 break;
1746 }
1747 }
1748
1749 static void emit_rewrite_lines(struct emit_callback *ecb,
1750 int prefix, const char *data, int size)
1751 {
1752 const char *endp = NULL;
1753
1754 while (0 < size) {
1755 int len;
1756
1757 endp = memchr(data, '\n', size);
1758 len = endp ? (endp - data + 1) : size;
1759 if (prefix != '+') {
1760 ecb->lno_in_preimage++;
1761 emit_del_line(ecb, data, len);
1762 } else {
1763 ecb->lno_in_postimage++;
1764 emit_add_line(ecb, data, len);
1765 }
1766 size -= len;
1767 data += len;
1768 }
1769 if (!endp)
1770 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1771 }
1772
1773 static void emit_rewrite_diff(const char *name_a,
1774 const char *name_b,
1775 struct diff_filespec *one,
1776 struct diff_filespec *two,
1777 struct userdiff_driver *textconv_one,
1778 struct userdiff_driver *textconv_two,
1779 struct diff_options *o)
1780 {
1781 int lc_a, lc_b;
1782 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1783 const char *a_prefix, *b_prefix;
1784 char *data_one, *data_two;
1785 size_t size_one, size_two;
1786 struct emit_callback ecbdata;
1787 struct strbuf out = STRBUF_INIT;
1788
1789 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1790 a_prefix = o->b_prefix;
1791 b_prefix = o->a_prefix;
1792 } else {
1793 a_prefix = o->a_prefix;
1794 b_prefix = o->b_prefix;
1795 }
1796
1797 name_a += (*name_a == '/');
1798 name_b += (*name_b == '/');
1799
1800 strbuf_reset(&a_name);
1801 strbuf_reset(&b_name);
1802 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1803 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1804
1805 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1806 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1807
1808 memset(&ecbdata, 0, sizeof(ecbdata));
1809 ecbdata.color_diff = want_color(o->use_color);
1810 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1811 ecbdata.opt = o;
1812 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1813 mmfile_t mf1, mf2;
1814 mf1.ptr = (char *)data_one;
1815 mf2.ptr = (char *)data_two;
1816 mf1.size = size_one;
1817 mf2.size = size_two;
1818 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1819 }
1820 ecbdata.lno_in_preimage = 1;
1821 ecbdata.lno_in_postimage = 1;
1822
1823 lc_a = count_lines(data_one, size_one);
1824 lc_b = count_lines(data_two, size_two);
1825
1826 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1827 a_name.buf, a_name.len, 0);
1828 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1829 b_name.buf, b_name.len, 0);
1830
1831 strbuf_addstr(&out, "@@ -");
1832 if (!o->irreversible_delete)
1833 add_line_count(&out, lc_a);
1834 else
1835 strbuf_addstr(&out, "?,?");
1836 strbuf_addstr(&out, " +");
1837 add_line_count(&out, lc_b);
1838 strbuf_addstr(&out, " @@\n");
1839 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1840 strbuf_release(&out);
1841
1842 if (lc_a && !o->irreversible_delete)
1843 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1844 if (lc_b)
1845 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1846 if (textconv_one)
1847 free((char *)data_one);
1848 if (textconv_two)
1849 free((char *)data_two);
1850 }
1851
1852 struct diff_words_buffer {
1853 mmfile_t text;
1854 unsigned long alloc;
1855 struct diff_words_orig {
1856 const char *begin, *end;
1857 } *orig;
1858 int orig_nr, orig_alloc;
1859 };
1860
1861 static void diff_words_append(char *line, unsigned long len,
1862 struct diff_words_buffer *buffer)
1863 {
1864 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1865 line++;
1866 len--;
1867 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1868 buffer->text.size += len;
1869 buffer->text.ptr[buffer->text.size] = '\0';
1870 }
1871
1872 struct diff_words_style_elem {
1873 const char *prefix;
1874 const char *suffix;
1875 const char *color; /* NULL; filled in by the setup code if
1876 * color is enabled */
1877 };
1878
1879 struct diff_words_style {
1880 enum diff_words_type type;
1881 struct diff_words_style_elem new_word, old_word, ctx;
1882 const char *newline;
1883 };
1884
1885 static struct diff_words_style diff_words_styles[] = {
1886 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1887 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1888 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1889 };
1890
1891 struct diff_words_data {
1892 struct diff_words_buffer minus, plus;
1893 const char *current_plus;
1894 int last_minus;
1895 struct diff_options *opt;
1896 regex_t *word_regex;
1897 enum diff_words_type type;
1898 struct diff_words_style *style;
1899 };
1900
1901 static int fn_out_diff_words_write_helper(struct diff_options *o,
1902 struct diff_words_style_elem *st_el,
1903 const char *newline,
1904 size_t count, const char *buf)
1905 {
1906 int print = 0;
1907 struct strbuf sb = STRBUF_INIT;
1908
1909 while (count) {
1910 char *p = memchr(buf, '\n', count);
1911 if (print)
1912 strbuf_addstr(&sb, diff_line_prefix(o));
1913
1914 if (p != buf) {
1915 const char *reset = st_el->color && *st_el->color ?
1916 GIT_COLOR_RESET : NULL;
1917 if (st_el->color && *st_el->color)
1918 strbuf_addstr(&sb, st_el->color);
1919 strbuf_addstr(&sb, st_el->prefix);
1920 strbuf_add(&sb, buf, p ? p - buf : count);
1921 strbuf_addstr(&sb, st_el->suffix);
1922 if (reset)
1923 strbuf_addstr(&sb, reset);
1924 }
1925 if (!p)
1926 goto out;
1927
1928 strbuf_addstr(&sb, newline);
1929 count -= p + 1 - buf;
1930 buf = p + 1;
1931 print = 1;
1932 if (count) {
1933 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1934 sb.buf, sb.len, 0);
1935 strbuf_reset(&sb);
1936 }
1937 }
1938
1939 out:
1940 if (sb.len)
1941 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1942 sb.buf, sb.len, 0);
1943 strbuf_release(&sb);
1944 return 0;
1945 }
1946
1947 /*
1948 * '--color-words' algorithm can be described as:
1949 *
1950 * 1. collect the minus/plus lines of a diff hunk, divided into
1951 * minus-lines and plus-lines;
1952 *
1953 * 2. break both minus-lines and plus-lines into words and
1954 * place them into two mmfile_t with one word for each line;
1955 *
1956 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1957 *
1958 * And for the common parts of the both file, we output the plus side text.
1959 * diff_words->current_plus is used to trace the current position of the plus file
1960 * which printed. diff_words->last_minus is used to trace the last minus word
1961 * printed.
1962 *
1963 * For '--graph' to work with '--color-words', we need to output the graph prefix
1964 * on each line of color words output. Generally, there are two conditions on
1965 * which we should output the prefix.
1966 *
1967 * 1. diff_words->last_minus == 0 &&
1968 * diff_words->current_plus == diff_words->plus.text.ptr
1969 *
1970 * that is: the plus text must start as a new line, and if there is no minus
1971 * word printed, a graph prefix must be printed.
1972 *
1973 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1974 * *(diff_words->current_plus - 1) == '\n'
1975 *
1976 * that is: a graph prefix must be printed following a '\n'
1977 */
1978 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1979 {
1980 if ((diff_words->last_minus == 0 &&
1981 diff_words->current_plus == diff_words->plus.text.ptr) ||
1982 (diff_words->current_plus > diff_words->plus.text.ptr &&
1983 *(diff_words->current_plus - 1) == '\n')) {
1984 return 1;
1985 } else {
1986 return 0;
1987 }
1988 }
1989
1990 static void fn_out_diff_words_aux(void *priv,
1991 long minus_first, long minus_len,
1992 long plus_first, long plus_len,
1993 const char *func, long funclen)
1994 {
1995 struct diff_words_data *diff_words = priv;
1996 struct diff_words_style *style = diff_words->style;
1997 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1998 struct diff_options *opt = diff_words->opt;
1999 const char *line_prefix;
2000
2001 assert(opt);
2002 line_prefix = diff_line_prefix(opt);
2003
2004 /* POSIX requires that first be decremented by one if len == 0... */
2005 if (minus_len) {
2006 minus_begin = diff_words->minus.orig[minus_first].begin;
2007 minus_end =
2008 diff_words->minus.orig[minus_first + minus_len - 1].end;
2009 } else
2010 minus_begin = minus_end =
2011 diff_words->minus.orig[minus_first].end;
2012
2013 if (plus_len) {
2014 plus_begin = diff_words->plus.orig[plus_first].begin;
2015 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
2016 } else
2017 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
2018
2019 if (color_words_output_graph_prefix(diff_words)) {
2020 fputs(line_prefix, diff_words->opt->file);
2021 }
2022 if (diff_words->current_plus != plus_begin) {
2023 fn_out_diff_words_write_helper(diff_words->opt,
2024 &style->ctx, style->newline,
2025 plus_begin - diff_words->current_plus,
2026 diff_words->current_plus);
2027 }
2028 if (minus_begin != minus_end) {
2029 fn_out_diff_words_write_helper(diff_words->opt,
2030 &style->old_word, style->newline,
2031 minus_end - minus_begin, minus_begin);
2032 }
2033 if (plus_begin != plus_end) {
2034 fn_out_diff_words_write_helper(diff_words->opt,
2035 &style->new_word, style->newline,
2036 plus_end - plus_begin, plus_begin);
2037 }
2038
2039 diff_words->current_plus = plus_end;
2040 diff_words->last_minus = minus_first;
2041 }
2042
2043 /* This function starts looking at *begin, and returns 0 iff a word was found. */
2044 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
2045 int *begin, int *end)
2046 {
2047 if (word_regex && *begin < buffer->size) {
2048 regmatch_t match[1];
2049 if (!regexec_buf(word_regex, buffer->ptr + *begin,
2050 buffer->size - *begin, 1, match, 0)) {
2051 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
2052 '\n', match[0].rm_eo - match[0].rm_so);
2053 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
2054 *begin += match[0].rm_so;
2055 return *begin >= *end;
2056 }
2057 return -1;
2058 }
2059
2060 /* find the next word */
2061 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2062 (*begin)++;
2063 if (*begin >= buffer->size)
2064 return -1;
2065
2066 /* find the end of the word */
2067 *end = *begin + 1;
2068 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2069 (*end)++;
2070
2071 return 0;
2072 }
2073
2074 /*
2075 * This function splits the words in buffer->text, stores the list with
2076 * newline separator into out, and saves the offsets of the original words
2077 * in buffer->orig.
2078 */
2079 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2080 regex_t *word_regex)
2081 {
2082 int i, j;
2083 long alloc = 0;
2084
2085 out->size = 0;
2086 out->ptr = NULL;
2087
2088 /* fake an empty "0th" word */
2089 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2090 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2091 buffer->orig_nr = 1;
2092
2093 for (i = 0; i < buffer->text.size; i++) {
2094 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2095 return;
2096
2097 /* store original boundaries */
2098 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2099 buffer->orig_alloc);
2100 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2101 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2102 buffer->orig_nr++;
2103
2104 /* store one word */
2105 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2106 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2107 out->ptr[out->size + j - i] = '\n';
2108 out->size += j - i + 1;
2109
2110 i = j - 1;
2111 }
2112 }
2113
2114 /* this executes the word diff on the accumulated buffers */
2115 static void diff_words_show(struct diff_words_data *diff_words)
2116 {
2117 xpparam_t xpp;
2118 xdemitconf_t xecfg;
2119 mmfile_t minus, plus;
2120 struct diff_words_style *style = diff_words->style;
2121
2122 struct diff_options *opt = diff_words->opt;
2123 const char *line_prefix;
2124
2125 assert(opt);
2126 line_prefix = diff_line_prefix(opt);
2127
2128 /* special case: only removal */
2129 if (!diff_words->plus.text.size) {
2130 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2131 line_prefix, strlen(line_prefix), 0);
2132 fn_out_diff_words_write_helper(diff_words->opt,
2133 &style->old_word, style->newline,
2134 diff_words->minus.text.size,
2135 diff_words->minus.text.ptr);
2136 diff_words->minus.text.size = 0;
2137 return;
2138 }
2139
2140 diff_words->current_plus = diff_words->plus.text.ptr;
2141 diff_words->last_minus = 0;
2142
2143 memset(&xpp, 0, sizeof(xpp));
2144 memset(&xecfg, 0, sizeof(xecfg));
2145 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2146 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2147 xpp.flags = 0;
2148 /* as only the hunk header will be parsed, we need a 0-context */
2149 xecfg.ctxlen = 0;
2150 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2151 diff_words, &xpp, &xecfg))
2152 die("unable to generate word diff");
2153 free(minus.ptr);
2154 free(plus.ptr);
2155 if (diff_words->current_plus != diff_words->plus.text.ptr +
2156 diff_words->plus.text.size) {
2157 if (color_words_output_graph_prefix(diff_words))
2158 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2159 line_prefix, strlen(line_prefix), 0);
2160 fn_out_diff_words_write_helper(diff_words->opt,
2161 &style->ctx, style->newline,
2162 diff_words->plus.text.ptr + diff_words->plus.text.size
2163 - diff_words->current_plus, diff_words->current_plus);
2164 }
2165 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2166 }
2167
2168 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2169 static void diff_words_flush(struct emit_callback *ecbdata)
2170 {
2171 struct diff_options *wo = ecbdata->diff_words->opt;
2172
2173 if (ecbdata->diff_words->minus.text.size ||
2174 ecbdata->diff_words->plus.text.size)
2175 diff_words_show(ecbdata->diff_words);
2176
2177 if (wo->emitted_symbols) {
2178 struct diff_options *o = ecbdata->opt;
2179 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2180 int i;
2181
2182 /*
2183 * NEEDSWORK:
2184 * Instead of appending each, concat all words to a line?
2185 */
2186 for (i = 0; i < wol->nr; i++)
2187 append_emitted_diff_symbol(o, &wol->buf[i]);
2188
2189 for (i = 0; i < wol->nr; i++)
2190 free((void *)wol->buf[i].line);
2191
2192 wol->nr = 0;
2193 }
2194 }
2195
2196 static void diff_filespec_load_driver(struct diff_filespec *one,
2197 struct index_state *istate)
2198 {
2199 /* Use already-loaded driver */
2200 if (one->driver)
2201 return;
2202
2203 if (S_ISREG(one->mode))
2204 one->driver = userdiff_find_by_path(istate, one->path);
2205
2206 /* Fallback to default settings */
2207 if (!one->driver)
2208 one->driver = userdiff_find_by_name("default");
2209 }
2210
2211 static const char *userdiff_word_regex(struct diff_filespec *one,
2212 struct index_state *istate)
2213 {
2214 diff_filespec_load_driver(one, istate);
2215 return one->driver->word_regex;
2216 }
2217
2218 static void init_diff_words_data(struct emit_callback *ecbdata,
2219 struct diff_options *orig_opts,
2220 struct diff_filespec *one,
2221 struct diff_filespec *two)
2222 {
2223 int i;
2224 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2225 memcpy(o, orig_opts, sizeof(struct diff_options));
2226
2227 ecbdata->diff_words =
2228 xcalloc(1, sizeof(struct diff_words_data));
2229 ecbdata->diff_words->type = o->word_diff;
2230 ecbdata->diff_words->opt = o;
2231
2232 if (orig_opts->emitted_symbols)
2233 o->emitted_symbols =
2234 xcalloc(1, sizeof(struct emitted_diff_symbols));
2235
2236 if (!o->word_regex)
2237 o->word_regex = userdiff_word_regex(one, o->repo->index);
2238 if (!o->word_regex)
2239 o->word_regex = userdiff_word_regex(two, o->repo->index);
2240 if (!o->word_regex)
2241 o->word_regex = diff_word_regex_cfg;
2242 if (o->word_regex) {
2243 ecbdata->diff_words->word_regex = (regex_t *)
2244 xmalloc(sizeof(regex_t));
2245 if (regcomp(ecbdata->diff_words->word_regex,
2246 o->word_regex,
2247 REG_EXTENDED | REG_NEWLINE))
2248 die("invalid regular expression: %s",
2249 o->word_regex);
2250 }
2251 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2252 if (o->word_diff == diff_words_styles[i].type) {
2253 ecbdata->diff_words->style =
2254 &diff_words_styles[i];
2255 break;
2256 }
2257 }
2258 if (want_color(o->use_color)) {
2259 struct diff_words_style *st = ecbdata->diff_words->style;
2260 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2261 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2262 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2263 }
2264 }
2265
2266 static void free_diff_words_data(struct emit_callback *ecbdata)
2267 {
2268 if (ecbdata->diff_words) {
2269 diff_words_flush(ecbdata);
2270 free (ecbdata->diff_words->opt->emitted_symbols);
2271 free (ecbdata->diff_words->opt);
2272 free (ecbdata->diff_words->minus.text.ptr);
2273 free (ecbdata->diff_words->minus.orig);
2274 free (ecbdata->diff_words->plus.text.ptr);
2275 free (ecbdata->diff_words->plus.orig);
2276 if (ecbdata->diff_words->word_regex) {
2277 regfree(ecbdata->diff_words->word_regex);
2278 free(ecbdata->diff_words->word_regex);
2279 }
2280 FREE_AND_NULL(ecbdata->diff_words);
2281 }
2282 }
2283
2284 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2285 {
2286 if (want_color(diff_use_color))
2287 return diff_colors[ix];
2288 return "";
2289 }
2290
2291 const char *diff_line_prefix(struct diff_options *opt)
2292 {
2293 struct strbuf *msgbuf;
2294 if (!opt->output_prefix)
2295 return "";
2296
2297 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2298 return msgbuf->buf;
2299 }
2300
2301 static unsigned long sane_truncate_line(char *line, unsigned long len)
2302 {
2303 const char *cp;
2304 unsigned long allot;
2305 size_t l = len;
2306
2307 cp = line;
2308 allot = l;
2309 while (0 < l) {
2310 (void) utf8_width(&cp, &l);
2311 if (!cp)
2312 break; /* truncated in the middle? */
2313 }
2314 return allot - l;
2315 }
2316
2317 static void find_lno(const char *line, struct emit_callback *ecbdata)
2318 {
2319 const char *p;
2320 ecbdata->lno_in_preimage = 0;
2321 ecbdata->lno_in_postimage = 0;
2322 p = strchr(line, '-');
2323 if (!p)
2324 return; /* cannot happen */
2325 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2326 p = strchr(p, '+');
2327 if (!p)
2328 return; /* cannot happen */
2329 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2330 }
2331
2332 static void fn_out_consume(void *priv, char *line, unsigned long len)
2333 {
2334 struct emit_callback *ecbdata = priv;
2335 struct diff_options *o = ecbdata->opt;
2336
2337 o->found_changes = 1;
2338
2339 if (ecbdata->header) {
2340 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2341 ecbdata->header->buf, ecbdata->header->len, 0);
2342 strbuf_reset(ecbdata->header);
2343 ecbdata->header = NULL;
2344 }
2345
2346 if (ecbdata->label_path[0]) {
2347 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2348 ecbdata->label_path[0],
2349 strlen(ecbdata->label_path[0]), 0);
2350 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2351 ecbdata->label_path[1],
2352 strlen(ecbdata->label_path[1]), 0);
2353 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2354 }
2355
2356 if (diff_suppress_blank_empty
2357 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2358 line[0] = '\n';
2359 len = 1;
2360 }
2361
2362 if (line[0] == '@') {
2363 if (ecbdata->diff_words)
2364 diff_words_flush(ecbdata);
2365 len = sane_truncate_line(line, len);
2366 find_lno(line, ecbdata);
2367 emit_hunk_header(ecbdata, line, len);
2368 return;
2369 }
2370
2371 if (ecbdata->diff_words) {
2372 enum diff_symbol s =
2373 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2374 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2375 if (line[0] == '-') {
2376 diff_words_append(line, len,
2377 &ecbdata->diff_words->minus);
2378 return;
2379 } else if (line[0] == '+') {
2380 diff_words_append(line, len,
2381 &ecbdata->diff_words->plus);
2382 return;
2383 } else if (starts_with(line, "\\ ")) {
2384 /*
2385 * Eat the "no newline at eof" marker as if we
2386 * saw a "+" or "-" line with nothing on it,
2387 * and return without diff_words_flush() to
2388 * defer processing. If this is the end of
2389 * preimage, more "+" lines may come after it.
2390 */
2391 return;
2392 }
2393 diff_words_flush(ecbdata);
2394 emit_diff_symbol(o, s, line, len, 0);
2395 return;
2396 }
2397
2398 switch (line[0]) {
2399 case '+':
2400 ecbdata->lno_in_postimage++;
2401 emit_add_line(ecbdata, line + 1, len - 1);
2402 break;
2403 case '-':
2404 ecbdata->lno_in_preimage++;
2405 emit_del_line(ecbdata, line + 1, len - 1);
2406 break;
2407 case ' ':
2408 ecbdata->lno_in_postimage++;
2409 ecbdata->lno_in_preimage++;
2410 emit_context_line(ecbdata, line + 1, len - 1);
2411 break;
2412 default:
2413 /* incomplete line at the end */
2414 ecbdata->lno_in_preimage++;
2415 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2416 line, len, 0);
2417 break;
2418 }
2419 }
2420
2421 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2422 {
2423 const char *old_name = a;
2424 const char *new_name = b;
2425 int pfx_length, sfx_length;
2426 int pfx_adjust_for_slash;
2427 int len_a = strlen(a);
2428 int len_b = strlen(b);
2429 int a_midlen, b_midlen;
2430 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2431 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2432
2433 if (qlen_a || qlen_b) {
2434 quote_c_style(a, name, NULL, 0);
2435 strbuf_addstr(name, " => ");
2436 quote_c_style(b, name, NULL, 0);
2437 return;
2438 }
2439
2440 /* Find common prefix */
2441 pfx_length = 0;
2442 while (*old_name && *new_name && *old_name == *new_name) {
2443 if (*old_name == '/')
2444 pfx_length = old_name - a + 1;
2445 old_name++;
2446 new_name++;
2447 }
2448
2449 /* Find common suffix */
2450 old_name = a + len_a;
2451 new_name = b + len_b;
2452 sfx_length = 0;
2453 /*
2454 * If there is a common prefix, it must end in a slash. In
2455 * that case we let this loop run 1 into the prefix to see the
2456 * same slash.
2457 *
2458 * If there is no common prefix, we cannot do this as it would
2459 * underrun the input strings.
2460 */
2461 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2462 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2463 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2464 *old_name == *new_name) {
2465 if (*old_name == '/')
2466 sfx_length = len_a - (old_name - a);
2467 old_name--;
2468 new_name--;
2469 }
2470
2471 /*
2472 * pfx{mid-a => mid-b}sfx
2473 * {pfx-a => pfx-b}sfx
2474 * pfx{sfx-a => sfx-b}
2475 * name-a => name-b
2476 */
2477 a_midlen = len_a - pfx_length - sfx_length;
2478 b_midlen = len_b - pfx_length - sfx_length;
2479 if (a_midlen < 0)
2480 a_midlen = 0;
2481 if (b_midlen < 0)
2482 b_midlen = 0;
2483
2484 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2485 if (pfx_length + sfx_length) {
2486 strbuf_add(name, a, pfx_length);
2487 strbuf_addch(name, '{');
2488 }
2489 strbuf_add(name, a + pfx_length, a_midlen);
2490 strbuf_addstr(name, " => ");
2491 strbuf_add(name, b + pfx_length, b_midlen);
2492 if (pfx_length + sfx_length) {
2493 strbuf_addch(name, '}');
2494 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2495 }
2496 }
2497
2498 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2499 const char *name_a,
2500 const char *name_b)
2501 {
2502 struct diffstat_file *x;
2503 x = xcalloc(1, sizeof(*x));
2504 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2505 diffstat->files[diffstat->nr++] = x;
2506 if (name_b) {
2507 x->from_name = xstrdup(name_a);
2508 x->name = xstrdup(name_b);
2509 x->is_renamed = 1;
2510 }
2511 else {
2512 x->from_name = NULL;
2513 x->name = xstrdup(name_a);
2514 }
2515 return x;
2516 }
2517
2518 static void diffstat_consume(void *priv, char *line, unsigned long len)
2519 {
2520 struct diffstat_t *diffstat = priv;
2521 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2522
2523 if (line[0] == '+')
2524 x->added++;
2525 else if (line[0] == '-')
2526 x->deleted++;
2527 }
2528
2529 const char mime_boundary_leader[] = "------------";
2530
2531 static int scale_linear(int it, int width, int max_change)
2532 {
2533 if (!it)
2534 return 0;
2535 /*
2536 * make sure that at least one '-' or '+' is printed if
2537 * there is any change to this path. The easiest way is to
2538 * scale linearly as if the allotted width is one column shorter
2539 * than it is, and then add 1 to the result.
2540 */
2541 return 1 + (it * (width - 1) / max_change);
2542 }
2543
2544 static void show_graph(struct strbuf *out, char ch, int cnt,
2545 const char *set, const char *reset)
2546 {
2547 if (cnt <= 0)
2548 return;
2549 strbuf_addstr(out, set);
2550 strbuf_addchars(out, ch, cnt);
2551 strbuf_addstr(out, reset);
2552 }
2553
2554 static void fill_print_name(struct diffstat_file *file)
2555 {
2556 struct strbuf pname = STRBUF_INIT;
2557
2558 if (file->print_name)
2559 return;
2560
2561 if (file->is_renamed)
2562 pprint_rename(&pname, file->from_name, file->name);
2563 else
2564 quote_c_style(file->name, &pname, NULL, 0);
2565
2566 if (file->comments)
2567 strbuf_addf(&pname, " (%s)", file->comments);
2568
2569 file->print_name = strbuf_detach(&pname, NULL);
2570 }
2571
2572 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2573 int files, int insertions, int deletions)
2574 {
2575 struct strbuf sb = STRBUF_INIT;
2576
2577 if (!files) {
2578 assert(insertions == 0 && deletions == 0);
2579 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2580 NULL, 0, 0);
2581 return;
2582 }
2583
2584 strbuf_addf(&sb,
2585 (files == 1) ? " %d file changed" : " %d files changed",
2586 files);
2587
2588 /*
2589 * For binary diff, the caller may want to print "x files
2590 * changed" with insertions == 0 && deletions == 0.
2591 *
2592 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2593 * is probably less confusing (i.e skip over "2 files changed
2594 * but nothing about added/removed lines? Is this a bug in Git?").
2595 */
2596 if (insertions || deletions == 0) {
2597 strbuf_addf(&sb,
2598 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2599 insertions);
2600 }
2601
2602 if (deletions || insertions == 0) {
2603 strbuf_addf(&sb,
2604 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2605 deletions);
2606 }
2607 strbuf_addch(&sb, '\n');
2608 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2609 sb.buf, sb.len, 0);
2610 strbuf_release(&sb);
2611 }
2612
2613 void print_stat_summary(FILE *fp, int files,
2614 int insertions, int deletions)
2615 {
2616 struct diff_options o;
2617 memset(&o, 0, sizeof(o));
2618 o.file = fp;
2619
2620 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2621 }
2622
2623 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2624 {
2625 int i, len, add, del, adds = 0, dels = 0;
2626 uintmax_t max_change = 0, max_len = 0;
2627 int total_files = data->nr, count;
2628 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2629 const char *reset, *add_c, *del_c;
2630 int extra_shown = 0;
2631 const char *line_prefix = diff_line_prefix(options);
2632 struct strbuf out = STRBUF_INIT;
2633
2634 if (data->nr == 0)
2635 return;
2636
2637 count = options->stat_count ? options->stat_count : data->nr;
2638
2639 reset = diff_get_color_opt(options, DIFF_RESET);
2640 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2641 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2642
2643 /*
2644 * Find the longest filename and max number of changes
2645 */
2646 for (i = 0; (i < count) && (i < data->nr); i++) {
2647 struct diffstat_file *file = data->files[i];
2648 uintmax_t change = file->added + file->deleted;
2649
2650 if (!file->is_interesting && (change == 0)) {
2651 count++; /* not shown == room for one more */
2652 continue;
2653 }
2654 fill_print_name(file);
2655 len = strlen(file->print_name);
2656 if (max_len < len)
2657 max_len = len;
2658
2659 if (file->is_unmerged) {
2660 /* "Unmerged" is 8 characters */
2661 bin_width = bin_width < 8 ? 8 : bin_width;
2662 continue;
2663 }
2664 if (file->is_binary) {
2665 /* "Bin XXX -> YYY bytes" */
2666 int w = 14 + decimal_width(file->added)
2667 + decimal_width(file->deleted);
2668 bin_width = bin_width < w ? w : bin_width;
2669 /* Display change counts aligned with "Bin" */
2670 number_width = 3;
2671 continue;
2672 }
2673
2674 if (max_change < change)
2675 max_change = change;
2676 }
2677 count = i; /* where we can stop scanning in data->files[] */
2678
2679 /*
2680 * We have width = stat_width or term_columns() columns total.
2681 * We want a maximum of min(max_len, stat_name_width) for the name part.
2682 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2683 * We also need 1 for " " and 4 + decimal_width(max_change)
2684 * for " | NNNN " and one the empty column at the end, altogether
2685 * 6 + decimal_width(max_change).
2686 *
2687 * If there's not enough space, we will use the smaller of
2688 * stat_name_width (if set) and 5/8*width for the filename,
2689 * and the rest for constant elements + graph part, but no more
2690 * than stat_graph_width for the graph part.
2691 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2692 * for the standard terminal size).
2693 *
2694 * In other words: stat_width limits the maximum width, and
2695 * stat_name_width fixes the maximum width of the filename,
2696 * and is also used to divide available columns if there
2697 * aren't enough.
2698 *
2699 * Binary files are displayed with "Bin XXX -> YYY bytes"
2700 * instead of the change count and graph. This part is treated
2701 * similarly to the graph part, except that it is not
2702 * "scaled". If total width is too small to accommodate the
2703 * guaranteed minimum width of the filename part and the
2704 * separators and this message, this message will "overflow"
2705 * making the line longer than the maximum width.
2706 */
2707
2708 if (options->stat_width == -1)
2709 width = term_columns() - strlen(line_prefix);
2710 else
2711 width = options->stat_width ? options->stat_width : 80;
2712 number_width = decimal_width(max_change) > number_width ?
2713 decimal_width(max_change) : number_width;
2714
2715 if (options->stat_graph_width == -1)
2716 options->stat_graph_width = diff_stat_graph_width;
2717
2718 /*
2719 * Guarantee 3/8*16==6 for the graph part
2720 * and 5/8*16==10 for the filename part
2721 */
2722 if (width < 16 + 6 + number_width)
2723 width = 16 + 6 + number_width;
2724
2725 /*
2726 * First assign sizes that are wanted, ignoring available width.
2727 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2728 * starting from "XXX" should fit in graph_width.
2729 */
2730 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2731 if (options->stat_graph_width &&
2732 options->stat_graph_width < graph_width)
2733 graph_width = options->stat_graph_width;
2734
2735 name_width = (options->stat_name_width > 0 &&
2736 options->stat_name_width < max_len) ?
2737 options->stat_name_width : max_len;
2738
2739 /*
2740 * Adjust adjustable widths not to exceed maximum width
2741 */
2742 if (name_width + number_width + 6 + graph_width > width) {
2743 if (graph_width > width * 3/8 - number_width - 6) {
2744 graph_width = width * 3/8 - number_width - 6;
2745 if (graph_width < 6)
2746 graph_width = 6;
2747 }
2748
2749 if (options->stat_graph_width &&
2750 graph_width > options->stat_graph_width)
2751 graph_width = options->stat_graph_width;
2752 if (name_width > width - number_width - 6 - graph_width)
2753 name_width = width - number_width - 6 - graph_width;
2754 else
2755 graph_width = width - number_width - 6 - name_width;
2756 }
2757
2758 /*
2759 * From here name_width is the width of the name area,
2760 * and graph_width is the width of the graph area.
2761 * max_change is used to scale graph properly.
2762 */
2763 for (i = 0; i < count; i++) {
2764 const char *prefix = "";
2765 struct diffstat_file *file = data->files[i];
2766 char *name = file->print_name;
2767 uintmax_t added = file->added;
2768 uintmax_t deleted = file->deleted;
2769 int name_len;
2770
2771 if (!file->is_interesting && (added + deleted == 0))
2772 continue;
2773
2774 /*
2775 * "scale" the filename
2776 */
2777 len = name_width;
2778 name_len = strlen(name);
2779 if (name_width < name_len) {
2780 char *slash;
2781 prefix = "...";
2782 len -= 3;
2783 name += name_len - len;
2784 slash = strchr(name, '/');
2785 if (slash)
2786 name = slash;
2787 }
2788
2789 if (file->is_binary) {
2790 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2791 strbuf_addf(&out, " %*s", number_width, "Bin");
2792 if (!added && !deleted) {
2793 strbuf_addch(&out, '\n');
2794 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2795 out.buf, out.len, 0);
2796 strbuf_reset(&out);
2797 continue;
2798 }
2799 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2800 del_c, deleted, reset);
2801 strbuf_addstr(&out, " -> ");
2802 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2803 add_c, added, reset);
2804 strbuf_addstr(&out, " bytes\n");
2805 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2806 out.buf, out.len, 0);
2807 strbuf_reset(&out);
2808 continue;
2809 }
2810 else if (file->is_unmerged) {
2811 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2812 strbuf_addstr(&out, " Unmerged\n");
2813 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2814 out.buf, out.len, 0);
2815 strbuf_reset(&out);
2816 continue;
2817 }
2818
2819 /*
2820 * scale the add/delete
2821 */
2822 add = added;
2823 del = deleted;
2824
2825 if (graph_width <= max_change) {
2826 int total = scale_linear(add + del, graph_width, max_change);
2827 if (total < 2 && add && del)
2828 /* width >= 2 due to the sanity check */
2829 total = 2;
2830 if (add < del) {
2831 add = scale_linear(add, graph_width, max_change);
2832 del = total - add;
2833 } else {
2834 del = scale_linear(del, graph_width, max_change);
2835 add = total - del;
2836 }
2837 }
2838 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2839 strbuf_addf(&out, " %*"PRIuMAX"%s",
2840 number_width, added + deleted,
2841 added + deleted ? " " : "");
2842 show_graph(&out, '+', add, add_c, reset);
2843 show_graph(&out, '-', del, del_c, reset);
2844 strbuf_addch(&out, '\n');
2845 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2846 out.buf, out.len, 0);
2847 strbuf_reset(&out);
2848 }
2849
2850 for (i = 0; i < data->nr; i++) {
2851 struct diffstat_file *file = data->files[i];
2852 uintmax_t added = file->added;
2853 uintmax_t deleted = file->deleted;
2854
2855 if (file->is_unmerged ||
2856 (!file->is_interesting && (added + deleted == 0))) {
2857 total_files--;
2858 continue;
2859 }
2860
2861 if (!file->is_binary) {
2862 adds += added;
2863 dels += deleted;
2864 }
2865 if (i < count)
2866 continue;
2867 if (!extra_shown)
2868 emit_diff_symbol(options,
2869 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2870 NULL, 0, 0);
2871 extra_shown = 1;
2872 }
2873
2874 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2875 strbuf_release(&out);
2876 }
2877
2878 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2879 {
2880 int i, adds = 0, dels = 0, total_files = data->nr;
2881
2882 if (data->nr == 0)
2883 return;
2884
2885 for (i = 0; i < data->nr; i++) {
2886 int added = data->files[i]->added;
2887 int deleted = data->files[i]->deleted;
2888
2889 if (data->files[i]->is_unmerged ||
2890 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2891 total_files--;
2892 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2893 adds += added;
2894 dels += deleted;
2895 }
2896 }
2897 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2898 }
2899
2900 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2901 {
2902 int i;
2903
2904 if (data->nr == 0)
2905 return;
2906
2907 for (i = 0; i < data->nr; i++) {
2908 struct diffstat_file *file = data->files[i];
2909
2910 fprintf(options->file, "%s", diff_line_prefix(options));
2911
2912 if (file->is_binary)
2913 fprintf(options->file, "-\t-\t");
2914 else
2915 fprintf(options->file,
2916 "%"PRIuMAX"\t%"PRIuMAX"\t",
2917 file->added, file->deleted);
2918 if (options->line_termination) {
2919 fill_print_name(file);
2920 if (!file->is_renamed)
2921 write_name_quoted(file->name, options->file,
2922 options->line_termination);
2923 else {
2924 fputs(file->print_name, options->file);
2925 putc(options->line_termination, options->file);
2926 }
2927 } else {
2928 if (file->is_renamed) {
2929 putc('\0', options->file);
2930 write_name_quoted(file->from_name, options->file, '\0');
2931 }
2932 write_name_quoted(file->name, options->file, '\0');
2933 }
2934 }
2935 }
2936
2937 struct dirstat_file {
2938 const char *name;
2939 unsigned long changed;
2940 };
2941
2942 struct dirstat_dir {
2943 struct dirstat_file *files;
2944 int alloc, nr, permille, cumulative;
2945 };
2946
2947 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2948 unsigned long changed, const char *base, int baselen)
2949 {
2950 unsigned long sum_changes = 0;
2951 unsigned int sources = 0;
2952 const char *line_prefix = diff_line_prefix(opt);
2953
2954 while (dir->nr) {
2955 struct dirstat_file *f = dir->files;
2956 int namelen = strlen(f->name);
2957 unsigned long changes;
2958 char *slash;
2959
2960 if (namelen < baselen)
2961 break;
2962 if (memcmp(f->name, base, baselen))
2963 break;
2964 slash = strchr(f->name + baselen, '/');
2965 if (slash) {
2966 int newbaselen = slash + 1 - f->name;
2967 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2968 sources++;
2969 } else {
2970 changes = f->changed;
2971 dir->files++;
2972 dir->nr--;
2973 sources += 2;
2974 }
2975 sum_changes += changes;
2976 }
2977
2978 /*
2979 * We don't report dirstat's for
2980 * - the top level
2981 * - or cases where everything came from a single directory
2982 * under this directory (sources == 1).
2983 */
2984 if (baselen && sources != 1) {
2985 if (sum_changes) {
2986 int permille = sum_changes * 1000 / changed;
2987 if (permille >= dir->permille) {
2988 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2989 permille / 10, permille % 10, baselen, base);
2990 if (!dir->cumulative)
2991 return 0;
2992 }
2993 }
2994 }
2995 return sum_changes;
2996 }
2997
2998 static int dirstat_compare(const void *_a, const void *_b)
2999 {
3000 const struct dirstat_file *a = _a;
3001 const struct dirstat_file *b = _b;
3002 return strcmp(a->name, b->name);
3003 }
3004
3005 static void show_dirstat(struct diff_options *options)
3006 {
3007 int i;
3008 unsigned long changed;
3009 struct dirstat_dir dir;
3010 struct diff_queue_struct *q = &diff_queued_diff;
3011
3012 dir.files = NULL;
3013 dir.alloc = 0;
3014 dir.nr = 0;
3015 dir.permille = options->dirstat_permille;
3016 dir.cumulative = options->flags.dirstat_cumulative;
3017
3018 changed = 0;
3019 for (i = 0; i < q->nr; i++) {
3020 struct diff_filepair *p = q->queue[i];
3021 const char *name;
3022 unsigned long copied, added, damage;
3023
3024 name = p->two->path ? p->two->path : p->one->path;
3025
3026 if (p->one->oid_valid && p->two->oid_valid &&
3027 oideq(&p->one->oid, &p->two->oid)) {
3028 /*
3029 * The SHA1 has not changed, so pre-/post-content is
3030 * identical. We can therefore skip looking at the
3031 * file contents altogether.
3032 */
3033 damage = 0;
3034 goto found_damage;
3035 }
3036
3037 if (options->flags.dirstat_by_file) {
3038 /*
3039 * In --dirstat-by-file mode, we don't really need to
3040 * look at the actual file contents at all.
3041 * The fact that the SHA1 changed is enough for us to
3042 * add this file to the list of results
3043 * (with each file contributing equal damage).
3044 */
3045 damage = 1;
3046 goto found_damage;
3047 }
3048
3049 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
3050 diff_populate_filespec(options->repo, p->one, 0);
3051 diff_populate_filespec(options->repo, p->two, 0);
3052 diffcore_count_changes(options->repo,
3053 p->one, p->two, NULL, NULL,
3054 &copied, &added);
3055 diff_free_filespec_data(p->one);
3056 diff_free_filespec_data(p->two);
3057 } else if (DIFF_FILE_VALID(p->one)) {
3058 diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
3059 copied = added = 0;
3060 diff_free_filespec_data(p->one);
3061 } else if (DIFF_FILE_VALID(p->two)) {
3062 diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
3063 copied = 0;
3064 added = p->two->size;
3065 diff_free_filespec_data(p->two);
3066 } else
3067 continue;
3068
3069 /*
3070 * Original minus copied is the removed material,
3071 * added is the new material. They are both damages
3072 * made to the preimage.
3073 * If the resulting damage is zero, we know that
3074 * diffcore_count_changes() considers the two entries to
3075 * be identical, but since the oid changed, we
3076 * know that there must have been _some_ kind of change,
3077 * so we force all entries to have damage > 0.
3078 */
3079 damage = (p->one->size - copied) + added;
3080 if (!damage)
3081 damage = 1;
3082
3083 found_damage:
3084 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3085 dir.files[dir.nr].name = name;
3086 dir.files[dir.nr].changed = damage;
3087 changed += damage;
3088 dir.nr++;
3089 }
3090
3091 /* This can happen even with many files, if everything was renames */
3092 if (!changed)
3093 return;
3094
3095 /* Show all directories with more than x% of the changes */
3096 QSORT(dir.files, dir.nr, dirstat_compare);
3097 gather_dirstat(options, &dir, changed, "", 0);
3098 }
3099
3100 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3101 {
3102 int i;
3103 unsigned long changed;
3104 struct dirstat_dir dir;
3105
3106 if (data->nr == 0)
3107 return;
3108
3109 dir.files = NULL;
3110 dir.alloc = 0;
3111 dir.nr = 0;
3112 dir.permille = options->dirstat_permille;
3113 dir.cumulative = options->flags.dirstat_cumulative;
3114
3115 changed = 0;
3116 for (i = 0; i < data->nr; i++) {
3117 struct diffstat_file *file = data->files[i];
3118 unsigned long damage = file->added + file->deleted;
3119 if (file->is_binary)
3120 /*
3121 * binary files counts bytes, not lines. Must find some
3122 * way to normalize binary bytes vs. textual lines.
3123 * The following heuristic assumes that there are 64
3124 * bytes per "line".
3125 * This is stupid and ugly, but very cheap...
3126 */
3127 damage = DIV_ROUND_UP(damage, 64);
3128 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3129 dir.files[dir.nr].name = file->name;
3130 dir.files[dir.nr].changed = damage;
3131 changed += damage;
3132 dir.nr++;
3133 }
3134
3135 /* This can happen even with many files, if everything was renames */
3136 if (!changed)
3137 return;
3138
3139 /* Show all directories with more than x% of the changes */
3140 QSORT(dir.files, dir.nr, dirstat_compare);
3141 gather_dirstat(options, &dir, changed, "", 0);
3142 }
3143
3144 void free_diffstat_info(struct diffstat_t *diffstat)
3145 {
3146 int i;
3147 for (i = 0; i < diffstat->nr; i++) {
3148 struct diffstat_file *f = diffstat->files[i];
3149 free(f->print_name);
3150 free(f->name);
3151 free(f->from_name);
3152 free(f);
3153 }
3154 free(diffstat->files);
3155 }
3156
3157 struct checkdiff_t {
3158 const char *filename;
3159 int lineno;
3160 int conflict_marker_size;
3161 struct diff_options *o;
3162 unsigned ws_rule;
3163 unsigned status;
3164 };
3165
3166 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3167 {
3168 char firstchar;
3169 int cnt;
3170
3171 if (len < marker_size + 1)
3172 return 0;
3173 firstchar = line[0];
3174 switch (firstchar) {
3175 case '=': case '>': case '<': case '|':
3176 break;
3177 default:
3178 return 0;
3179 }
3180 for (cnt = 1; cnt < marker_size; cnt++)
3181 if (line[cnt] != firstchar)
3182 return 0;
3183 /* line[1] through line[marker_size-1] are same as firstchar */
3184 if (len < marker_size + 1 || !isspace(line[marker_size]))
3185 return 0;
3186 return 1;
3187 }
3188
3189 static void checkdiff_consume_hunk(void *priv,
3190 long ob, long on, long nb, long nn,
3191 const char *func, long funclen)
3192
3193 {
3194 struct checkdiff_t *data = priv;
3195 data->lineno = nb - 1;
3196 }
3197
3198 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3199 {
3200 struct checkdiff_t *data = priv;
3201 int marker_size = data->conflict_marker_size;
3202 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3203 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3204 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3205 char *err;
3206 const char *line_prefix;
3207
3208 assert(data->o);
3209 line_prefix = diff_line_prefix(data->o);
3210
3211 if (line[0] == '+') {
3212 unsigned bad;
3213 data->lineno++;
3214 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3215 data->status |= 1;
3216 fprintf(data->o->file,
3217 "%s%s:%d: leftover conflict marker\n",
3218 line_prefix, data->filename, data->lineno);
3219 }
3220 bad = ws_check(line + 1, len - 1, data->ws_rule);
3221 if (!bad)
3222 return;
3223 data->status |= bad;
3224 err = whitespace_error_string(bad);
3225 fprintf(data->o->file, "%s%s:%d: %s.\n",
3226 line_prefix, data->filename, data->lineno, err);
3227 free(err);
3228 emit_line(data->o, set, reset, line, 1);
3229 ws_check_emit(line + 1, len - 1, data->ws_rule,
3230 data->o->file, set, reset, ws);
3231 } else if (line[0] == ' ') {
3232 data->lineno++;
3233 }
3234 }
3235
3236 static unsigned char *deflate_it(char *data,
3237 unsigned long size,
3238 unsigned long *result_size)
3239 {
3240 int bound;
3241 unsigned char *deflated;
3242 git_zstream stream;
3243
3244 git_deflate_init(&stream, zlib_compression_level);
3245 bound = git_deflate_bound(&stream, size);
3246 deflated = xmalloc(bound);
3247 stream.next_out = deflated;
3248 stream.avail_out = bound;
3249
3250 stream.next_in = (unsigned char *)data;
3251 stream.avail_in = size;
3252 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3253 ; /* nothing */
3254 git_deflate_end(&stream);
3255 *result_size = stream.total_out;
3256 return deflated;
3257 }
3258
3259 static void emit_binary_diff_body(struct diff_options *o,
3260 mmfile_t *one, mmfile_t *two)
3261 {
3262 void *cp;
3263 void *delta;
3264 void *deflated;
3265 void *data;
3266 unsigned long orig_size;
3267 unsigned long delta_size;
3268 unsigned long deflate_size;
3269 unsigned long data_size;
3270
3271 /* We could do deflated delta, or we could do just deflated two,
3272 * whichever is smaller.
3273 */
3274 delta = NULL;
3275 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3276 if (one->size && two->size) {
3277 delta = diff_delta(one->ptr, one->size,
3278 two->ptr, two->size,
3279 &delta_size, deflate_size);
3280 if (delta) {
3281 void *to_free = delta;
3282 orig_size = delta_size;
3283 delta = deflate_it(delta, delta_size, &delta_size);
3284 free(to_free);
3285 }
3286 }
3287
3288 if (delta && delta_size < deflate_size) {
3289 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3290 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3291 s, strlen(s), 0);
3292 free(s);
3293 free(deflated);
3294 data = delta;
3295 data_size = delta_size;
3296 } else {
3297 char *s = xstrfmt("%lu", two->size);
3298 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3299 s, strlen(s), 0);
3300 free(s);
3301 free(delta);
3302 data = deflated;
3303 data_size = deflate_size;
3304 }
3305
3306 /* emit data encoded in base85 */
3307 cp = data;
3308 while (data_size) {
3309 int len;
3310 int bytes = (52 < data_size) ? 52 : data_size;
3311 char line[71];
3312 data_size -= bytes;
3313 if (bytes <= 26)
3314 line[0] = bytes + 'A' - 1;
3315 else
3316 line[0] = bytes - 26 + 'a' - 1;
3317 encode_85(line + 1, cp, bytes);
3318 cp = (char *) cp + bytes;
3319
3320 len = strlen(line);
3321 line[len++] = '\n';
3322 line[len] = '\0';
3323
3324 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3325 line, len, 0);
3326 }
3327 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3328 free(data);
3329 }
3330
3331 static void emit_binary_diff(struct diff_options *o,
3332 mmfile_t *one, mmfile_t *two)
3333 {
3334 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3335 emit_binary_diff_body(o, one, two);
3336 emit_binary_diff_body(o, two, one);
3337 }
3338
3339 int diff_filespec_is_binary(struct repository *r,
3340 struct diff_filespec *one)
3341 {
3342 if (one->is_binary == -1) {
3343 diff_filespec_load_driver(one, r->index);
3344 if (one->driver->binary != -1)
3345 one->is_binary = one->driver->binary;
3346 else {
3347 if (!one->data && DIFF_FILE_VALID(one))
3348 diff_populate_filespec(r, one, CHECK_BINARY);
3349 if (one->is_binary == -1 && one->data)
3350 one->is_binary = buffer_is_binary(one->data,
3351 one->size);
3352 if (one->is_binary == -1)
3353 one->is_binary = 0;
3354 }
3355 }
3356 return one->is_binary;
3357 }
3358
3359 static const struct userdiff_funcname *
3360 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3361 {
3362 diff_filespec_load_driver(one, o->repo->index);
3363 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3364 }
3365
3366 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3367 {
3368 if (!options->a_prefix)
3369 options->a_prefix = a;
3370 if (!options->b_prefix)
3371 options->b_prefix = b;
3372 }
3373
3374 struct userdiff_driver *get_textconv(struct repository *r,
3375 struct diff_filespec *one)
3376 {
3377 if (!DIFF_FILE_VALID(one))
3378 return NULL;
3379
3380 diff_filespec_load_driver(one, r->index);
3381 return userdiff_get_textconv(r, one->driver);
3382 }
3383
3384 static void builtin_diff(const char *name_a,
3385 const char *name_b,
3386 struct diff_filespec *one,
3387 struct diff_filespec *two,
3388 const char *xfrm_msg,
3389 int must_show_header,
3390 struct diff_options *o,
3391 int complete_rewrite)
3392 {
3393 mmfile_t mf1, mf2;
3394 const char *lbl[2];
3395 char *a_one, *b_two;
3396 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3397 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3398 const char *a_prefix, *b_prefix;
3399 struct userdiff_driver *textconv_one = NULL;
3400 struct userdiff_driver *textconv_two = NULL;
3401 struct strbuf header = STRBUF_INIT;
3402 const char *line_prefix = diff_line_prefix(o);
3403
3404 diff_set_mnemonic_prefix(o, "a/", "b/");
3405 if (o->flags.reverse_diff) {
3406 a_prefix = o->b_prefix;
3407 b_prefix = o->a_prefix;
3408 } else {
3409 a_prefix = o->a_prefix;
3410 b_prefix = o->b_prefix;
3411 }
3412
3413 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3414 (!one->mode || S_ISGITLINK(one->mode)) &&
3415 (!two->mode || S_ISGITLINK(two->mode))) {
3416 show_submodule_summary(o, one->path ? one->path : two->path,
3417 &one->oid, &two->oid,
3418 two->dirty_submodule);
3419 return;
3420 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3421 (!one->mode || S_ISGITLINK(one->mode)) &&
3422 (!two->mode || S_ISGITLINK(two->mode))) {
3423 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3424 &one->oid, &two->oid,
3425 two->dirty_submodule);
3426 return;
3427 }
3428
3429 if (o->flags.allow_textconv) {
3430 textconv_one = get_textconv(o->repo, one);
3431 textconv_two = get_textconv(o->repo, two);
3432 }
3433
3434 /* Never use a non-valid filename anywhere if at all possible */
3435 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3436 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3437
3438 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3439 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3440 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3441 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3442 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3443 if (lbl[0][0] == '/') {
3444 /* /dev/null */
3445 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3446 if (xfrm_msg)
3447 strbuf_addstr(&header, xfrm_msg);
3448 must_show_header = 1;
3449 }
3450 else if (lbl[1][0] == '/') {
3451 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3452 if (xfrm_msg)
3453 strbuf_addstr(&header, xfrm_msg);
3454 must_show_header = 1;
3455 }
3456 else {
3457 if (one->mode != two->mode) {
3458 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3459 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3460 must_show_header = 1;
3461 }
3462 if (xfrm_msg)
3463 strbuf_addstr(&header, xfrm_msg);
3464
3465 /*
3466 * we do not run diff between different kind
3467 * of objects.
3468 */
3469 if ((one->mode ^ two->mode) & S_IFMT)
3470 goto free_ab_and_return;
3471 if (complete_rewrite &&
3472 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3473 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3474 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3475 header.buf, header.len, 0);
3476 strbuf_reset(&header);
3477 emit_rewrite_diff(name_a, name_b, one, two,
3478 textconv_one, textconv_two, o);
3479 o->found_changes = 1;
3480 goto free_ab_and_return;
3481 }
3482 }
3483
3484 if (o->irreversible_delete && lbl[1][0] == '/') {
3485 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3486 header.len, 0);
3487 strbuf_reset(&header);
3488 goto free_ab_and_return;
3489 } else if (!o->flags.text &&
3490 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3491 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3492 struct strbuf sb = STRBUF_INIT;
3493 if (!one->data && !two->data &&
3494 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3495 !o->flags.binary) {
3496 if (oideq(&one->oid, &two->oid)) {
3497 if (must_show_header)
3498 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3499 header.buf, header.len,
3500 0);
3501 goto free_ab_and_return;
3502 }
3503 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3504 header.buf, header.len, 0);
3505 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3506 diff_line_prefix(o), lbl[0], lbl[1]);
3507 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3508 sb.buf, sb.len, 0);
3509 strbuf_release(&sb);
3510 goto free_ab_and_return;
3511 }
3512 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3513 fill_mmfile(o->repo, &mf2, two) < 0)
3514 die("unable to read files to diff");
3515 /* Quite common confusing case */
3516 if (mf1.size == mf2.size &&
3517 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3518 if (must_show_header)
3519 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3520 header.buf, header.len, 0);
3521 goto free_ab_and_return;
3522 }
3523 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3524 strbuf_reset(&header);
3525 if (o->flags.binary)
3526 emit_binary_diff(o, &mf1, &mf2);
3527 else {
3528 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3529 diff_line_prefix(o), lbl[0], lbl[1]);
3530 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3531 sb.buf, sb.len, 0);
3532 strbuf_release(&sb);
3533 }
3534 o->found_changes = 1;
3535 } else {
3536 /* Crazy xdl interfaces.. */
3537 const char *diffopts;
3538 const char *v;
3539 xpparam_t xpp;
3540 xdemitconf_t xecfg;
3541 struct emit_callback ecbdata;
3542 const struct userdiff_funcname *pe;
3543
3544 if (must_show_header) {
3545 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3546 header.buf, header.len, 0);
3547 strbuf_reset(&header);
3548 }
3549
3550 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3551 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3552
3553 pe = diff_funcname_pattern(o, one);
3554 if (!pe)
3555 pe = diff_funcname_pattern(o, two);
3556
3557 memset(&xpp, 0, sizeof(xpp));
3558 memset(&xecfg, 0, sizeof(xecfg));
3559 memset(&ecbdata, 0, sizeof(ecbdata));
3560 if (o->flags.suppress_diff_headers)
3561 lbl[0] = NULL;
3562 ecbdata.label_path = lbl;
3563 ecbdata.color_diff = want_color(o->use_color);
3564 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3565 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3566 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3567 ecbdata.opt = o;
3568 if (header.len && !o->flags.suppress_diff_headers)
3569 ecbdata.header = &header;
3570 xpp.flags = o->xdl_opts;
3571 xpp.anchors = o->anchors;
3572 xpp.anchors_nr = o->anchors_nr;
3573 xecfg.ctxlen = o->context;
3574 xecfg.interhunkctxlen = o->interhunkcontext;
3575 xecfg.flags = XDL_EMIT_FUNCNAMES;
3576 if (o->flags.funccontext)
3577 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3578 if (pe)
3579 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3580
3581 diffopts = getenv("GIT_DIFF_OPTS");
3582 if (!diffopts)
3583 ;
3584 else if (skip_prefix(diffopts, "--unified=", &v))
3585 xecfg.ctxlen = strtoul(v, NULL, 10);
3586 else if (skip_prefix(diffopts, "-u", &v))
3587 xecfg.ctxlen = strtoul(v, NULL, 10);
3588
3589 if (o->word_diff)
3590 init_diff_words_data(&ecbdata, o, one, two);
3591 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3592 &ecbdata, &xpp, &xecfg))
3593 die("unable to generate diff for %s", one->path);
3594 if (o->word_diff)
3595 free_diff_words_data(&ecbdata);
3596 if (textconv_one)
3597 free(mf1.ptr);
3598 if (textconv_two)
3599 free(mf2.ptr);
3600 xdiff_clear_find_func(&xecfg);
3601 }
3602
3603 free_ab_and_return:
3604 strbuf_release(&header);
3605 diff_free_filespec_data(one);
3606 diff_free_filespec_data(two);
3607 free(a_one);
3608 free(b_two);
3609 return;
3610 }
3611
3612 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3613 {
3614 if (!is_renamed) {
3615 if (p->status == DIFF_STATUS_ADDED) {
3616 if (S_ISLNK(p->two->mode))
3617 return "new +l";
3618 else if ((p->two->mode & 0777) == 0755)
3619 return "new +x";
3620 else
3621 return "new";
3622 } else if (p->status == DIFF_STATUS_DELETED)
3623 return "gone";
3624 }
3625 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3626 return "mode -l";
3627 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3628 return "mode +l";
3629 else if ((p->one->mode & 0777) == 0644 &&
3630 (p->two->mode & 0777) == 0755)
3631 return "mode +x";
3632 else if ((p->one->mode & 0777) == 0755 &&
3633 (p->two->mode & 0777) == 0644)
3634 return "mode -x";
3635 return NULL;
3636 }
3637
3638 static void builtin_diffstat(const char *name_a, const char *name_b,
3639 struct diff_filespec *one,
3640 struct diff_filespec *two,
3641 struct diffstat_t *diffstat,
3642 struct diff_options *o,
3643 struct diff_filepair *p)
3644 {
3645 mmfile_t mf1, mf2;
3646 struct diffstat_file *data;
3647 int same_contents;
3648 int complete_rewrite = 0;
3649
3650 if (!DIFF_PAIR_UNMERGED(p)) {
3651 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3652 complete_rewrite = 1;
3653 }
3654
3655 data = diffstat_add(diffstat, name_a, name_b);
3656 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3657 if (o->flags.stat_with_summary)
3658 data->comments = get_compact_summary(p, data->is_renamed);
3659
3660 if (!one || !two) {
3661 data->is_unmerged = 1;
3662 return;
3663 }
3664
3665 same_contents = oideq(&one->oid, &two->oid);
3666
3667 if (diff_filespec_is_binary(o->repo, one) ||
3668 diff_filespec_is_binary(o->repo, two)) {
3669 data->is_binary = 1;
3670 if (same_contents) {
3671 data->added = 0;
3672 data->deleted = 0;
3673 } else {
3674 data->added = diff_filespec_size(o->repo, two);
3675 data->deleted = diff_filespec_size(o->repo, one);
3676 }
3677 }
3678
3679 else if (complete_rewrite) {
3680 diff_populate_filespec(o->repo, one, 0);
3681 diff_populate_filespec(o->repo, two, 0);
3682 data->deleted = count_lines(one->data, one->size);
3683 data->added = count_lines(two->data, two->size);
3684 }
3685
3686 else if (!same_contents) {
3687 /* Crazy xdl interfaces.. */
3688 xpparam_t xpp;
3689 xdemitconf_t xecfg;
3690
3691 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3692 fill_mmfile(o->repo, &mf2, two) < 0)
3693 die("unable to read files to diff");
3694
3695 memset(&xpp, 0, sizeof(xpp));
3696 memset(&xecfg, 0, sizeof(xecfg));
3697 xpp.flags = o->xdl_opts;
3698 xpp.anchors = o->anchors;
3699 xpp.anchors_nr = o->anchors_nr;
3700 xecfg.ctxlen = o->context;
3701 xecfg.interhunkctxlen = o->interhunkcontext;
3702 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
3703 diffstat_consume, diffstat, &xpp, &xecfg))
3704 die("unable to generate diffstat for %s", one->path);
3705 }
3706
3707 diff_free_filespec_data(one);
3708 diff_free_filespec_data(two);
3709 }
3710
3711 static void builtin_checkdiff(const char *name_a, const char *name_b,
3712 const char *attr_path,
3713 struct diff_filespec *one,
3714 struct diff_filespec *two,
3715 struct diff_options *o)
3716 {
3717 mmfile_t mf1, mf2;
3718 struct checkdiff_t data;
3719
3720 if (!two)
3721 return;
3722
3723 memset(&data, 0, sizeof(data));
3724 data.filename = name_b ? name_b : name_a;
3725 data.lineno = 0;
3726 data.o = o;
3727 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3728 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3729
3730 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3731 fill_mmfile(o->repo, &mf2, two) < 0)
3732 die("unable to read files to diff");
3733
3734 /*
3735 * All the other codepaths check both sides, but not checking
3736 * the "old" side here is deliberate. We are checking the newly
3737 * introduced changes, and as long as the "new" side is text, we
3738 * can and should check what it introduces.
3739 */
3740 if (diff_filespec_is_binary(o->repo, two))
3741 goto free_and_return;
3742 else {
3743 /* Crazy xdl interfaces.. */
3744 xpparam_t xpp;
3745 xdemitconf_t xecfg;
3746
3747 memset(&xpp, 0, sizeof(xpp));
3748 memset(&xecfg, 0, sizeof(xecfg));
3749 xecfg.ctxlen = 1; /* at least one context line */
3750 xpp.flags = 0;
3751 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3752 checkdiff_consume, &data,
3753 &xpp, &xecfg))
3754 die("unable to generate checkdiff for %s", one->path);
3755
3756 if (data.ws_rule & WS_BLANK_AT_EOF) {
3757 struct emit_callback ecbdata;
3758 int blank_at_eof;
3759
3760 ecbdata.ws_rule = data.ws_rule;
3761 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3762 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3763
3764 if (blank_at_eof) {
3765 static char *err;
3766 if (!err)
3767 err = whitespace_error_string(WS_BLANK_AT_EOF);
3768 fprintf(o->file, "%s:%d: %s.\n",
3769 data.filename, blank_at_eof, err);
3770 data.status = 1; /* report errors */
3771 }
3772 }
3773 }
3774 free_and_return:
3775 diff_free_filespec_data(one);
3776 diff_free_filespec_data(two);
3777 if (data.status)
3778 o->flags.check_failed = 1;
3779 }
3780
3781 struct diff_filespec *alloc_filespec(const char *path)
3782 {
3783 struct diff_filespec *spec;
3784
3785 FLEXPTR_ALLOC_STR(spec, path, path);
3786 spec->count = 1;
3787 spec->is_binary = -1;
3788 return spec;
3789 }
3790
3791 void free_filespec(struct diff_filespec *spec)
3792 {
3793 if (!--spec->count) {
3794 diff_free_filespec_data(spec);
3795 free(spec);
3796 }
3797 }
3798
3799 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3800 int oid_valid, unsigned short mode)
3801 {
3802 if (mode) {
3803 spec->mode = canon_mode(mode);
3804 oidcpy(&spec->oid, oid);
3805 spec->oid_valid = oid_valid;
3806 }
3807 }
3808
3809 /*
3810 * Given a name and sha1 pair, if the index tells us the file in
3811 * the work tree has that object contents, return true, so that
3812 * prepare_temp_file() does not have to inflate and extract.
3813 */
3814 static int reuse_worktree_file(struct index_state *istate,
3815 const char *name,
3816 const struct object_id *oid,
3817 int want_file)
3818 {
3819 const struct cache_entry *ce;
3820 struct stat st;
3821 int pos, len;
3822
3823 /*
3824 * We do not read the cache ourselves here, because the
3825 * benchmark with my previous version that always reads cache
3826 * shows that it makes things worse for diff-tree comparing
3827 * two linux-2.6 kernel trees in an already checked out work
3828 * tree. This is because most diff-tree comparisons deal with
3829 * only a small number of files, while reading the cache is
3830 * expensive for a large project, and its cost outweighs the
3831 * savings we get by not inflating the object to a temporary
3832 * file. Practically, this code only helps when we are used
3833 * by diff-cache --cached, which does read the cache before
3834 * calling us.
3835 */
3836 if (!istate->cache)
3837 return 0;
3838
3839 /* We want to avoid the working directory if our caller
3840 * doesn't need the data in a normal file, this system
3841 * is rather slow with its stat/open/mmap/close syscalls,
3842 * and the object is contained in a pack file. The pack
3843 * is probably already open and will be faster to obtain
3844 * the data through than the working directory. Loose
3845 * objects however would tend to be slower as they need
3846 * to be individually opened and inflated.
3847 */
3848 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3849 return 0;
3850
3851 /*
3852 * Similarly, if we'd have to convert the file contents anyway, that
3853 * makes the optimization not worthwhile.
3854 */
3855 if (!want_file && would_convert_to_git(istate, name))
3856 return 0;
3857
3858 len = strlen(name);
3859 pos = index_name_pos(istate, name, len);
3860 if (pos < 0)
3861 return 0;
3862 ce = istate->cache[pos];
3863
3864 /*
3865 * This is not the sha1 we are looking for, or
3866 * unreusable because it is not a regular file.
3867 */
3868 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3869 return 0;
3870
3871 /*
3872 * If ce is marked as "assume unchanged", there is no
3873 * guarantee that work tree matches what we are looking for.
3874 */
3875 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3876 return 0;
3877
3878 /*
3879 * If ce matches the file in the work tree, we can reuse it.
3880 */
3881 if (ce_uptodate(ce) ||
3882 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3883 return 1;
3884
3885 return 0;
3886 }
3887
3888 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3889 {
3890 struct strbuf buf = STRBUF_INIT;
3891 char *dirty = "";
3892
3893 /* Are we looking at the work tree? */
3894 if (s->dirty_submodule)
3895 dirty = "-dirty";
3896
3897 strbuf_addf(&buf, "Subproject commit %s%s\n",
3898 oid_to_hex(&s->oid), dirty);
3899 s->size = buf.len;
3900 if (size_only) {
3901 s->data = NULL;
3902 strbuf_release(&buf);
3903 } else {
3904 s->data = strbuf_detach(&buf, NULL);
3905 s->should_free = 1;
3906 }
3907 return 0;
3908 }
3909
3910 /*
3911 * While doing rename detection and pickaxe operation, we may need to
3912 * grab the data for the blob (or file) for our own in-core comparison.
3913 * diff_filespec has data and size fields for this purpose.
3914 */
3915 int diff_populate_filespec(struct repository *r,
3916 struct diff_filespec *s,
3917 unsigned int flags)
3918 {
3919 int size_only = flags & CHECK_SIZE_ONLY;
3920 int err = 0;
3921 int conv_flags = global_conv_flags_eol;
3922 /*
3923 * demote FAIL to WARN to allow inspecting the situation
3924 * instead of refusing.
3925 */
3926 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3927 conv_flags = CONV_EOL_RNDTRP_WARN;
3928
3929 if (!DIFF_FILE_VALID(s))
3930 die("internal error: asking to populate invalid file.");
3931 if (S_ISDIR(s->mode))
3932 return -1;
3933
3934 if (s->data)
3935 return 0;
3936
3937 if (size_only && 0 < s->size)
3938 return 0;
3939
3940 if (S_ISGITLINK(s->mode))
3941 return diff_populate_gitlink(s, size_only);
3942
3943 if (!s->oid_valid ||
3944 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3945 struct strbuf buf = STRBUF_INIT;
3946 struct stat st;
3947 int fd;
3948
3949 if (lstat(s->path, &st) < 0) {
3950 err_empty:
3951 err = -1;
3952 empty:
3953 s->data = (char *)"";
3954 s->size = 0;
3955 return err;
3956 }
3957 s->size = xsize_t(st.st_size);
3958 if (!s->size)
3959 goto empty;
3960 if (S_ISLNK(st.st_mode)) {
3961 struct strbuf sb = STRBUF_INIT;
3962
3963 if (strbuf_readlink(&sb, s->path, s->size))
3964 goto err_empty;
3965 s->size = sb.len;
3966 s->data = strbuf_detach(&sb, NULL);
3967 s->should_free = 1;
3968 return 0;
3969 }
3970
3971 /*
3972 * Even if the caller would be happy with getting
3973 * only the size, we cannot return early at this
3974 * point if the path requires us to run the content
3975 * conversion.
3976 */
3977 if (size_only && !would_convert_to_git(r->index, s->path))
3978 return 0;
3979
3980 /*
3981 * Note: this check uses xsize_t(st.st_size) that may
3982 * not be the true size of the blob after it goes
3983 * through convert_to_git(). This may not strictly be
3984 * correct, but the whole point of big_file_threshold
3985 * and is_binary check being that we want to avoid
3986 * opening the file and inspecting the contents, this
3987 * is probably fine.
3988 */
3989 if ((flags & CHECK_BINARY) &&
3990 s->size > big_file_threshold && s->is_binary == -1) {
3991 s->is_binary = 1;
3992 return 0;
3993 }
3994 fd = open(s->path, O_RDONLY);
3995 if (fd < 0)
3996 goto err_empty;
3997 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3998 close(fd);
3999 s->should_munmap = 1;
4000
4001 /*
4002 * Convert from working tree format to canonical git format
4003 */
4004 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
4005 size_t size = 0;
4006 munmap(s->data, s->size);
4007 s->should_munmap = 0;
4008 s->data = strbuf_detach(&buf, &size);
4009 s->size = size;
4010 s->should_free = 1;
4011 }
4012 }
4013 else {
4014 enum object_type type;
4015 if (size_only || (flags & CHECK_BINARY)) {
4016 type = oid_object_info(r, &s->oid, &s->size);
4017 if (type < 0)
4018 die("unable to read %s",
4019 oid_to_hex(&s->oid));
4020 if (size_only)
4021 return 0;
4022 if (s->size > big_file_threshold && s->is_binary == -1) {
4023 s->is_binary = 1;
4024 return 0;
4025 }
4026 }
4027 s->data = read_object_file(&s->oid, &type, &s->size);
4028 if (!s->data)
4029 die("unable to read %s", oid_to_hex(&s->oid));
4030 s->should_free = 1;
4031 }
4032 return 0;
4033 }
4034
4035 void diff_free_filespec_blob(struct diff_filespec *s)
4036 {
4037 if (s->should_free)
4038 free(s->data);
4039 else if (s->should_munmap)
4040 munmap(s->data, s->size);
4041
4042 if (s->should_free || s->should_munmap) {
4043 s->should_free = s->should_munmap = 0;
4044 s->data = NULL;
4045 }
4046 }
4047
4048 void diff_free_filespec_data(struct diff_filespec *s)
4049 {
4050 diff_free_filespec_blob(s);
4051 FREE_AND_NULL(s->cnt_data);
4052 }
4053
4054 static void prep_temp_blob(struct index_state *istate,
4055 const char *path, struct diff_tempfile *temp,
4056 void *blob,
4057 unsigned long size,
4058 const struct object_id *oid,
4059 int mode)
4060 {
4061 struct strbuf buf = STRBUF_INIT;
4062 struct strbuf tempfile = STRBUF_INIT;
4063 char *path_dup = xstrdup(path);
4064 const char *base = basename(path_dup);
4065
4066 /* Generate "XXXXXX_basename.ext" */
4067 strbuf_addstr(&tempfile, "XXXXXX_");
4068 strbuf_addstr(&tempfile, base);
4069
4070 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4071 if (!temp->tempfile)
4072 die_errno("unable to create temp-file");
4073 if (convert_to_working_tree(istate, path,
4074 (const char *)blob, (size_t)size, &buf)) {
4075 blob = buf.buf;
4076 size = buf.len;
4077 }
4078 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4079 close_tempfile_gently(temp->tempfile))
4080 die_errno("unable to write temp-file");
4081 temp->name = get_tempfile_path(temp->tempfile);
4082 oid_to_hex_r(temp->hex, oid);
4083 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4084 strbuf_release(&buf);
4085 strbuf_release(&tempfile);
4086 free(path_dup);
4087 }
4088
4089 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4090 const char *name,
4091 struct diff_filespec *one)
4092 {
4093 struct diff_tempfile *temp = claim_diff_tempfile();
4094
4095 if (!DIFF_FILE_VALID(one)) {
4096 not_a_valid_file:
4097 /* A '-' entry produces this for file-2, and
4098 * a '+' entry produces this for file-1.
4099 */
4100 temp->name = "/dev/null";
4101 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4102 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4103 return temp;
4104 }
4105
4106 if (!S_ISGITLINK(one->mode) &&
4107 (!one->oid_valid ||
4108 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4109 struct stat st;
4110 if (lstat(name, &st) < 0) {
4111 if (errno == ENOENT)
4112 goto not_a_valid_file;
4113 die_errno("stat(%s)", name);
4114 }
4115 if (S_ISLNK(st.st_mode)) {
4116 struct strbuf sb = STRBUF_INIT;
4117 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4118 die_errno("readlink(%s)", name);
4119 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4120 (one->oid_valid ?
4121 &one->oid : &null_oid),
4122 (one->oid_valid ?
4123 one->mode : S_IFLNK));
4124 strbuf_release(&sb);
4125 }
4126 else {
4127 /* we can borrow from the file in the work tree */
4128 temp->name = name;
4129 if (!one->oid_valid)
4130 oid_to_hex_r(temp->hex, &null_oid);
4131 else
4132 oid_to_hex_r(temp->hex, &one->oid);
4133 /* Even though we may sometimes borrow the
4134 * contents from the work tree, we always want
4135 * one->mode. mode is trustworthy even when
4136 * !(one->oid_valid), as long as
4137 * DIFF_FILE_VALID(one).
4138 */
4139 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4140 }
4141 return temp;
4142 }
4143 else {
4144 if (diff_populate_filespec(r, one, 0))
4145 die("cannot read data blob for %s", one->path);
4146 prep_temp_blob(r->index, name, temp,
4147 one->data, one->size,
4148 &one->oid, one->mode);
4149 }
4150 return temp;
4151 }
4152
4153 static void add_external_diff_name(struct repository *r,
4154 struct argv_array *argv,
4155 const char *name,
4156 struct diff_filespec *df)
4157 {
4158 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4159 argv_array_push(argv, temp->name);
4160 argv_array_push(argv, temp->hex);
4161 argv_array_push(argv, temp->mode);
4162 }
4163
4164 /* An external diff command takes:
4165 *
4166 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4167 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4168 *
4169 */
4170 static void run_external_diff(const char *pgm,
4171 const char *name,
4172 const char *other,
4173 struct diff_filespec *one,
4174 struct diff_filespec *two,
4175 const char *xfrm_msg,
4176 struct diff_options *o)
4177 {
4178 struct argv_array argv = ARGV_ARRAY_INIT;
4179 struct argv_array env = ARGV_ARRAY_INIT;
4180 struct diff_queue_struct *q = &diff_queued_diff;
4181
4182 argv_array_push(&argv, pgm);
4183 argv_array_push(&argv, name);
4184
4185 if (one && two) {
4186 add_external_diff_name(o->repo, &argv, name, one);
4187 if (!other)
4188 add_external_diff_name(o->repo, &argv, name, two);
4189 else {
4190 add_external_diff_name(o->repo, &argv, other, two);
4191 argv_array_push(&argv, other);
4192 argv_array_push(&argv, xfrm_msg);
4193 }
4194 }
4195
4196 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4197 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4198
4199 diff_free_filespec_data(one);
4200 diff_free_filespec_data(two);
4201 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4202 die(_("external diff died, stopping at %s"), name);
4203
4204 remove_tempfile();
4205 argv_array_clear(&argv);
4206 argv_array_clear(&env);
4207 }
4208
4209 static int similarity_index(struct diff_filepair *p)
4210 {
4211 return p->score * 100 / MAX_SCORE;
4212 }
4213
4214 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4215 {
4216 if (startup_info->have_repository)
4217 return find_unique_abbrev(oid, abbrev);
4218 else {
4219 char *hex = oid_to_hex(oid);
4220 if (abbrev < 0)
4221 abbrev = FALLBACK_DEFAULT_ABBREV;
4222 if (abbrev > the_hash_algo->hexsz)
4223 BUG("oid abbreviation out of range: %d", abbrev);
4224 if (abbrev)
4225 hex[abbrev] = '\0';
4226 return hex;
4227 }
4228 }
4229
4230 static void fill_metainfo(struct strbuf *msg,
4231 const char *name,
4232 const char *other,
4233 struct diff_filespec *one,
4234 struct diff_filespec *two,
4235 struct diff_options *o,
4236 struct diff_filepair *p,
4237 int *must_show_header,
4238 int use_color)
4239 {
4240 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4241 const char *reset = diff_get_color(use_color, DIFF_RESET);
4242 const char *line_prefix = diff_line_prefix(o);
4243
4244 *must_show_header = 1;
4245 strbuf_init(msg, PATH_MAX * 2 + 300);
4246 switch (p->status) {
4247 case DIFF_STATUS_COPIED:
4248 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4249 line_prefix, set, similarity_index(p));
4250 strbuf_addf(msg, "%s\n%s%scopy from ",
4251 reset, line_prefix, set);
4252 quote_c_style(name, msg, NULL, 0);
4253 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4254 quote_c_style(other, msg, NULL, 0);
4255 strbuf_addf(msg, "%s\n", reset);
4256 break;
4257 case DIFF_STATUS_RENAMED:
4258 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4259 line_prefix, set, similarity_index(p));
4260 strbuf_addf(msg, "%s\n%s%srename from ",
4261 reset, line_prefix, set);
4262 quote_c_style(name, msg, NULL, 0);
4263 strbuf_addf(msg, "%s\n%s%srename to ",
4264 reset, line_prefix, set);
4265 quote_c_style(other, msg, NULL, 0);
4266 strbuf_addf(msg, "%s\n", reset);
4267 break;
4268 case DIFF_STATUS_MODIFIED:
4269 if (p->score) {
4270 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4271 line_prefix,
4272 set, similarity_index(p), reset);
4273 break;
4274 }
4275 /* fallthru */
4276 default:
4277 *must_show_header = 0;
4278 }
4279 if (one && two && !oideq(&one->oid, &two->oid)) {
4280 const unsigned hexsz = the_hash_algo->hexsz;
4281 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4282
4283 if (o->flags.binary) {
4284 mmfile_t mf;
4285 if ((!fill_mmfile(o->repo, &mf, one) &&
4286 diff_filespec_is_binary(o->repo, one)) ||
4287 (!fill_mmfile(o->repo, &mf, two) &&
4288 diff_filespec_is_binary(o->repo, two)))
4289 abbrev = hexsz;
4290 }
4291 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4292 diff_abbrev_oid(&one->oid, abbrev),
4293 diff_abbrev_oid(&two->oid, abbrev));
4294 if (one->mode == two->mode)
4295 strbuf_addf(msg, " %06o", one->mode);
4296 strbuf_addf(msg, "%s\n", reset);
4297 }
4298 }
4299
4300 static void run_diff_cmd(const char *pgm,
4301 const char *name,
4302 const char *other,
4303 const char *attr_path,
4304 struct diff_filespec *one,
4305 struct diff_filespec *two,
4306 struct strbuf *msg,
4307 struct diff_options *o,
4308 struct diff_filepair *p)
4309 {
4310 const char *xfrm_msg = NULL;
4311 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4312 int must_show_header = 0;
4313
4314
4315 if (o->flags.allow_external) {
4316 struct userdiff_driver *drv;
4317
4318 drv = userdiff_find_by_path(o->repo->index, attr_path);
4319 if (drv && drv->external)
4320 pgm = drv->external;
4321 }
4322
4323 if (msg) {
4324 /*
4325 * don't use colors when the header is intended for an
4326 * external diff driver
4327 */
4328 fill_metainfo(msg, name, other, one, two, o, p,
4329 &must_show_header,
4330 want_color(o->use_color) && !pgm);
4331 xfrm_msg = msg->len ? msg->buf : NULL;
4332 }
4333
4334 if (pgm) {
4335 run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
4336 return;
4337 }
4338 if (one && two)
4339 builtin_diff(name, other ? other : name,
4340 one, two, xfrm_msg, must_show_header,
4341 o, complete_rewrite);
4342 else
4343 fprintf(o->file, "* Unmerged path %s\n", name);
4344 }
4345
4346 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4347 {
4348 if (DIFF_FILE_VALID(one)) {
4349 if (!one->oid_valid) {
4350 struct stat st;
4351 if (one->is_stdin) {
4352 oidclr(&one->oid);
4353 return;
4354 }
4355 if (lstat(one->path, &st) < 0)
4356 die_errno("stat '%s'", one->path);
4357 if (index_path(istate, &one->oid, one->path, &st, 0))
4358 die("cannot hash %s", one->path);
4359 }
4360 }
4361 else
4362 oidclr(&one->oid);
4363 }
4364
4365 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4366 {
4367 /* Strip the prefix but do not molest /dev/null and absolute paths */
4368 if (*namep && !is_absolute_path(*namep)) {
4369 *namep += prefix_length;
4370 if (**namep == '/')
4371 ++*namep;
4372 }
4373 if (*otherp && !is_absolute_path(*otherp)) {
4374 *otherp += prefix_length;
4375 if (**otherp == '/')
4376 ++*otherp;
4377 }
4378 }
4379
4380 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4381 {
4382 const char *pgm = external_diff();
4383 struct strbuf msg;
4384 struct diff_filespec *one = p->one;
4385 struct diff_filespec *two = p->two;
4386 const char *name;
4387 const char *other;
4388 const char *attr_path;
4389
4390 name = one->path;
4391 other = (strcmp(name, two->path) ? two->path : NULL);
4392 attr_path = name;
4393 if (o->prefix_length)
4394 strip_prefix(o->prefix_length, &name, &other);
4395
4396 if (!o->flags.allow_external)
4397 pgm = NULL;
4398
4399 if (DIFF_PAIR_UNMERGED(p)) {
4400 run_diff_cmd(pgm, name, NULL, attr_path,
4401 NULL, NULL, NULL, o, p);
4402 return;
4403 }
4404
4405 diff_fill_oid_info(one, o->repo->index);
4406 diff_fill_oid_info(two, o->repo->index);
4407
4408 if (!pgm &&
4409 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4410 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4411 /*
4412 * a filepair that changes between file and symlink
4413 * needs to be split into deletion and creation.
4414 */
4415 struct diff_filespec *null = alloc_filespec(two->path);
4416 run_diff_cmd(NULL, name, other, attr_path,
4417 one, null, &msg,
4418 o, p);
4419 free(null);
4420 strbuf_release(&msg);
4421
4422 null = alloc_filespec(one->path);
4423 run_diff_cmd(NULL, name, other, attr_path,
4424 null, two, &msg, o, p);
4425 free(null);
4426 }
4427 else
4428 run_diff_cmd(pgm, name, other, attr_path,
4429 one, two, &msg, o, p);
4430
4431 strbuf_release(&msg);
4432 }
4433
4434 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4435 struct diffstat_t *diffstat)
4436 {
4437 const char *name;
4438 const char *other;
4439
4440 if (DIFF_PAIR_UNMERGED(p)) {
4441 /* unmerged */
4442 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4443 diffstat, o, p);
4444 return;
4445 }
4446
4447 name = p->one->path;
4448 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4449
4450 if (o->prefix_length)
4451 strip_prefix(o->prefix_length, &name, &other);
4452
4453 diff_fill_oid_info(p->one, o->repo->index);
4454 diff_fill_oid_info(p->two, o->repo->index);
4455
4456 builtin_diffstat(name, other, p->one, p->two,
4457 diffstat, o, p);
4458 }
4459
4460 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4461 {
4462 const char *name;
4463 const char *other;
4464 const char *attr_path;
4465
4466 if (DIFF_PAIR_UNMERGED(p)) {
4467 /* unmerged */
4468 return;
4469 }
4470
4471 name = p->one->path;
4472 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4473 attr_path = other ? other : name;
4474
4475 if (o->prefix_length)
4476 strip_prefix(o->prefix_length, &name, &other);
4477
4478 diff_fill_oid_info(p->one, o->repo->index);
4479 diff_fill_oid_info(p->two, o->repo->index);
4480
4481 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4482 }
4483
4484 static void prep_parse_options(struct diff_options *options);
4485
4486 void repo_diff_setup(struct repository *r, struct diff_options *options)
4487 {
4488 memcpy(options, &default_diff_options, sizeof(*options));
4489
4490 options->file = stdout;
4491 options->repo = r;
4492
4493 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4494 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4495 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4496 options->abbrev = DEFAULT_ABBREV;
4497 options->line_termination = '\n';
4498 options->break_opt = -1;
4499 options->rename_limit = -1;
4500 options->dirstat_permille = diff_dirstat_permille_default;
4501 options->context = diff_context_default;
4502 options->interhunkcontext = diff_interhunk_context_default;
4503 options->ws_error_highlight = ws_error_highlight_default;
4504 options->flags.rename_empty = 1;
4505 options->objfind = NULL;
4506
4507 /* pathchange left =NULL by default */
4508 options->change = diff_change;
4509 options->add_remove = diff_addremove;
4510 options->use_color = diff_use_color_default;
4511 options->detect_rename = diff_detect_rename_default;
4512 options->xdl_opts |= diff_algorithm;
4513 if (diff_indent_heuristic)
4514 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4515
4516 options->orderfile = diff_order_file_cfg;
4517
4518 if (diff_no_prefix) {
4519 options->a_prefix = options->b_prefix = "";
4520 } else if (!diff_mnemonic_prefix) {
4521 options->a_prefix = "a/";
4522 options->b_prefix = "b/";
4523 }
4524
4525 options->color_moved = diff_color_moved_default;
4526 options->color_moved_ws_handling = diff_color_moved_ws_default;
4527
4528 prep_parse_options(options);
4529 }
4530
4531 void diff_setup_done(struct diff_options *options)
4532 {
4533 unsigned check_mask = DIFF_FORMAT_NAME |
4534 DIFF_FORMAT_NAME_STATUS |
4535 DIFF_FORMAT_CHECKDIFF |
4536 DIFF_FORMAT_NO_OUTPUT;
4537 /*
4538 * This must be signed because we're comparing against a potentially
4539 * negative value.
4540 */
4541 const int hexsz = the_hash_algo->hexsz;
4542
4543 if (options->set_default)
4544 options->set_default(options);
4545
4546 if (HAS_MULTI_BITS(options->output_format & check_mask))
4547 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4548
4549 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4550 die(_("-G, -S and --find-object are mutually exclusive"));
4551
4552 /*
4553 * Most of the time we can say "there are changes"
4554 * only by checking if there are changed paths, but
4555 * --ignore-whitespace* options force us to look
4556 * inside contents.
4557 */
4558
4559 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4560 options->flags.diff_from_contents = 1;
4561 else
4562 options->flags.diff_from_contents = 0;
4563
4564 if (options->flags.find_copies_harder)
4565 options->detect_rename = DIFF_DETECT_COPY;
4566
4567 if (!options->flags.relative_name)
4568 options->prefix = NULL;
4569 if (options->prefix)
4570 options->prefix_length = strlen(options->prefix);
4571 else
4572 options->prefix_length = 0;
4573
4574 if (options->output_format & (DIFF_FORMAT_NAME |
4575 DIFF_FORMAT_NAME_STATUS |
4576 DIFF_FORMAT_CHECKDIFF |
4577 DIFF_FORMAT_NO_OUTPUT))
4578 options->output_format &= ~(DIFF_FORMAT_RAW |
4579 DIFF_FORMAT_NUMSTAT |
4580 DIFF_FORMAT_DIFFSTAT |
4581 DIFF_FORMAT_SHORTSTAT |
4582 DIFF_FORMAT_DIRSTAT |
4583 DIFF_FORMAT_SUMMARY |
4584 DIFF_FORMAT_PATCH);
4585
4586 /*
4587 * These cases always need recursive; we do not drop caller-supplied
4588 * recursive bits for other formats here.
4589 */
4590 if (options->output_format & (DIFF_FORMAT_PATCH |
4591 DIFF_FORMAT_NUMSTAT |
4592 DIFF_FORMAT_DIFFSTAT |
4593 DIFF_FORMAT_SHORTSTAT |
4594 DIFF_FORMAT_DIRSTAT |
4595 DIFF_FORMAT_SUMMARY |
4596 DIFF_FORMAT_CHECKDIFF))
4597 options->flags.recursive = 1;
4598 /*
4599 * Also pickaxe would not work very well if you do not say recursive
4600 */
4601 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4602 options->flags.recursive = 1;
4603 /*
4604 * When patches are generated, submodules diffed against the work tree
4605 * must be checked for dirtiness too so it can be shown in the output
4606 */
4607 if (options->output_format & DIFF_FORMAT_PATCH)
4608 options->flags.dirty_submodules = 1;
4609
4610 if (options->detect_rename && options->rename_limit < 0)
4611 options->rename_limit = diff_rename_limit_default;
4612 if (hexsz < options->abbrev)
4613 options->abbrev = hexsz; /* full */
4614
4615 /*
4616 * It does not make sense to show the first hit we happened
4617 * to have found. It does not make sense not to return with
4618 * exit code in such a case either.
4619 */
4620 if (options->flags.quick) {
4621 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4622 options->flags.exit_with_status = 1;
4623 }
4624
4625 options->diff_path_counter = 0;
4626
4627 if (options->flags.follow_renames && options->pathspec.nr != 1)
4628 die(_("--follow requires exactly one pathspec"));
4629
4630 if (!options->use_color || external_diff())
4631 options->color_moved = 0;
4632
4633 FREE_AND_NULL(options->parseopts);
4634 }
4635
4636 int parse_long_opt(const char *opt, const char **argv,
4637 const char **optarg)
4638 {
4639 const char *arg = argv[0];
4640 if (!skip_prefix(arg, "--", &arg))
4641 return 0;
4642 if (!skip_prefix(arg, opt, &arg))
4643 return 0;
4644 if (*arg == '=') { /* stuck form: --option=value */
4645 *optarg = arg + 1;
4646 return 1;
4647 }
4648 if (*arg != '\0')
4649 return 0;
4650 /* separate form: --option value */
4651 if (!argv[1])
4652 die("Option '--%s' requires a value", opt);
4653 *optarg = argv[1];
4654 return 2;
4655 }
4656
4657 static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4658 {
4659 struct diff_options *options = opt->value;
4660 int width = options->stat_width;
4661 int name_width = options->stat_name_width;
4662 int graph_width = options->stat_graph_width;
4663 int count = options->stat_count;
4664 char *end;
4665
4666 BUG_ON_OPT_NEG(unset);
4667
4668 if (!strcmp(opt->long_name, "stat")) {
4669 if (value) {
4670 width = strtoul(value, &end, 10);
4671 if (*end == ',')
4672 name_width = strtoul(end+1, &end, 10);
4673 if (*end == ',')
4674 count = strtoul(end+1, &end, 10);
4675 if (*end)
4676 return error(_("invalid --stat value: %s"), value);
4677 }
4678 } else if (!strcmp(opt->long_name, "stat-width")) {
4679 width = strtoul(value, &end, 10);
4680 if (*end)
4681 return error(_("%s expects a numerical value"),
4682 opt->long_name);
4683 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4684 name_width = strtoul(value, &end, 10);
4685 if (*end)
4686 return error(_("%s expects a numerical value"),
4687 opt->long_name);
4688 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4689 graph_width = strtoul(value, &end, 10);
4690 if (*end)
4691 return error(_("%s expects a numerical value"),
4692 opt->long_name);
4693 } else if (!strcmp(opt->long_name, "stat-count")) {
4694 count = strtoul(value, &end, 10);
4695 if (*end)
4696 return error(_("%s expects a numerical value"),
4697 opt->long_name);
4698 } else
4699 BUG("%s should not get here", opt->long_name);
4700
4701 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4702 options->stat_name_width = name_width;
4703 options->stat_graph_width = graph_width;
4704 options->stat_width = width;
4705 options->stat_count = count;
4706 return 0;
4707 }
4708
4709 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4710 {
4711 struct strbuf errmsg = STRBUF_INIT;
4712 if (parse_dirstat_params(options, params, &errmsg))
4713 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4714 errmsg.buf);
4715 strbuf_release(&errmsg);
4716 /*
4717 * The caller knows a dirstat-related option is given from the command
4718 * line; allow it to say "return this_function();"
4719 */
4720 options->output_format |= DIFF_FORMAT_DIRSTAT;
4721 return 1;
4722 }
4723
4724 static const char diff_status_letters[] = {
4725 DIFF_STATUS_ADDED,
4726 DIFF_STATUS_COPIED,
4727 DIFF_STATUS_DELETED,
4728 DIFF_STATUS_MODIFIED,
4729 DIFF_STATUS_RENAMED,
4730 DIFF_STATUS_TYPE_CHANGED,
4731 DIFF_STATUS_UNKNOWN,
4732 DIFF_STATUS_UNMERGED,
4733 DIFF_STATUS_FILTER_AON,
4734 DIFF_STATUS_FILTER_BROKEN,
4735 '\0',
4736 };
4737
4738 static unsigned int filter_bit['Z' + 1];
4739
4740 static void prepare_filter_bits(void)
4741 {
4742 int i;
4743
4744 if (!filter_bit[DIFF_STATUS_ADDED]) {
4745 for (i = 0; diff_status_letters[i]; i++)
4746 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4747 }
4748 }
4749
4750 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4751 {
4752 return opt->filter & filter_bit[(int) status];
4753 }
4754
4755 unsigned diff_filter_bit(char status)
4756 {
4757 prepare_filter_bits();
4758 return filter_bit[(int) status];
4759 }
4760
4761 static int diff_opt_diff_filter(const struct option *option,
4762 const char *optarg, int unset)
4763 {
4764 struct diff_options *opt = option->value;
4765 int i, optch;
4766
4767 BUG_ON_OPT_NEG(unset);
4768 prepare_filter_bits();
4769
4770 /*
4771 * If there is a negation e.g. 'd' in the input, and we haven't
4772 * initialized the filter field with another --diff-filter, start
4773 * from full set of bits, except for AON.
4774 */
4775 if (!opt->filter) {
4776 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4777 if (optch < 'a' || 'z' < optch)
4778 continue;
4779 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4780 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4781 break;
4782 }
4783 }
4784
4785 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4786 unsigned int bit;
4787 int negate;
4788
4789 if ('a' <= optch && optch <= 'z') {
4790 negate = 1;
4791 optch = toupper(optch);
4792 } else {
4793 negate = 0;
4794 }
4795
4796 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4797 if (!bit)
4798 return error(_("unknown change class '%c' in --diff-filter=%s"),
4799 optarg[i], optarg);
4800 if (negate)
4801 opt->filter &= ~bit;
4802 else
4803 opt->filter |= bit;
4804 }
4805 return 0;
4806 }
4807
4808 static void enable_patch_output(int *fmt)
4809 {
4810 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4811 *fmt |= DIFF_FORMAT_PATCH;
4812 }
4813
4814 static int diff_opt_ws_error_highlight(const struct option *option,
4815 const char *arg, int unset)
4816 {
4817 struct diff_options *opt = option->value;
4818 int val = parse_ws_error_highlight(arg);
4819
4820 BUG_ON_OPT_NEG(unset);
4821 if (val < 0)
4822 return error(_("unknown value after ws-error-highlight=%.*s"),
4823 -1 - val, arg);
4824 opt->ws_error_highlight = val;
4825 return 0;
4826 }
4827
4828 static int diff_opt_find_object(const struct option *option,
4829 const char *arg, int unset)
4830 {
4831 struct diff_options *opt = option->value;
4832 struct object_id oid;
4833
4834 BUG_ON_OPT_NEG(unset);
4835 if (get_oid(arg, &oid))
4836 return error(_("unable to resolve '%s'"), arg);
4837
4838 if (!opt->objfind)
4839 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4840
4841 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4842 opt->flags.recursive = 1;
4843 opt->flags.tree_in_recursive = 1;
4844 oidset_insert(opt->objfind, &oid);
4845 return 0;
4846 }
4847
4848 static int diff_opt_anchored(const struct option *opt,
4849 const char *arg, int unset)
4850 {
4851 struct diff_options *options = opt->value;
4852
4853 BUG_ON_OPT_NEG(unset);
4854 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4855 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4856 options->anchors_alloc);
4857 options->anchors[options->anchors_nr++] = xstrdup(arg);
4858 return 0;
4859 }
4860
4861 static int diff_opt_binary(const struct option *opt,
4862 const char *arg, int unset)
4863 {
4864 struct diff_options *options = opt->value;
4865
4866 BUG_ON_OPT_NEG(unset);
4867 BUG_ON_OPT_ARG(arg);
4868 enable_patch_output(&options->output_format);
4869 options->flags.binary = 1;
4870 return 0;
4871 }
4872
4873 static int diff_opt_break_rewrites(const struct option *opt,
4874 const char *arg, int unset)
4875 {
4876 int *break_opt = opt->value;
4877 int opt1, opt2;
4878
4879 BUG_ON_OPT_NEG(unset);
4880 if (!arg)
4881 arg = "";
4882 opt1 = parse_rename_score(&arg);
4883 if (*arg == 0)
4884 opt2 = 0;
4885 else if (*arg != '/')
4886 return error(_("%s expects <n>/<m> form"), opt->long_name);
4887 else {
4888 arg++;
4889 opt2 = parse_rename_score(&arg);
4890 }
4891 if (*arg != 0)
4892 return error(_("%s expects <n>/<m> form"), opt->long_name);
4893 *break_opt = opt1 | (opt2 << 16);
4894 return 0;
4895 }
4896
4897 static int diff_opt_char(const struct option *opt,
4898 const char *arg, int unset)
4899 {
4900 char *value = opt->value;
4901
4902 BUG_ON_OPT_NEG(unset);
4903 if (arg[1])
4904 return error(_("%s expects a character, got '%s'"),
4905 opt->long_name, arg);
4906 *value = arg[0];
4907 return 0;
4908 }
4909
4910 static int diff_opt_color_moved(const struct option *opt,
4911 const char *arg, int unset)
4912 {
4913 struct diff_options *options = opt->value;
4914
4915 if (unset) {
4916 options->color_moved = COLOR_MOVED_NO;
4917 } else if (!arg) {
4918 if (diff_color_moved_default)
4919 options->color_moved = diff_color_moved_default;
4920 if (options->color_moved == COLOR_MOVED_NO)
4921 options->color_moved = COLOR_MOVED_DEFAULT;
4922 } else {
4923 int cm = parse_color_moved(arg);
4924 if (cm < 0)
4925 return error(_("bad --color-moved argument: %s"), arg);
4926 options->color_moved = cm;
4927 }
4928 return 0;
4929 }
4930
4931 static int diff_opt_color_moved_ws(const struct option *opt,
4932 const char *arg, int unset)
4933 {
4934 struct diff_options *options = opt->value;
4935 unsigned cm;
4936
4937 if (unset) {
4938 options->color_moved_ws_handling = 0;
4939 return 0;
4940 }
4941
4942 cm = parse_color_moved_ws(arg);
4943 if (cm & COLOR_MOVED_WS_ERROR)
4944 return error(_("invalid mode '%s' in --color-moved-ws"), arg);
4945 options->color_moved_ws_handling = cm;
4946 return 0;
4947 }
4948
4949 static int diff_opt_color_words(const struct option *opt,
4950 const char *arg, int unset)
4951 {
4952 struct diff_options *options = opt->value;
4953
4954 BUG_ON_OPT_NEG(unset);
4955 options->use_color = 1;
4956 options->word_diff = DIFF_WORDS_COLOR;
4957 options->word_regex = arg;
4958 return 0;
4959 }
4960
4961 static int diff_opt_compact_summary(const struct option *opt,
4962 const char *arg, int unset)
4963 {
4964 struct diff_options *options = opt->value;
4965
4966 BUG_ON_OPT_ARG(arg);
4967 if (unset) {
4968 options->flags.stat_with_summary = 0;
4969 } else {
4970 options->flags.stat_with_summary = 1;
4971 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4972 }
4973 return 0;
4974 }
4975
4976 static int diff_opt_diff_algorithm(const struct option *opt,
4977 const char *arg, int unset)
4978 {
4979 struct diff_options *options = opt->value;
4980 long value = parse_algorithm_value(arg);
4981
4982 BUG_ON_OPT_NEG(unset);
4983 if (value < 0)
4984 return error(_("option diff-algorithm accepts \"myers\", "
4985 "\"minimal\", \"patience\" and \"histogram\""));
4986
4987 /* clear out previous settings */
4988 DIFF_XDL_CLR(options, NEED_MINIMAL);
4989 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4990 options->xdl_opts |= value;
4991 return 0;
4992 }
4993
4994 static int diff_opt_dirstat(const struct option *opt,
4995 const char *arg, int unset)
4996 {
4997 struct diff_options *options = opt->value;
4998
4999 BUG_ON_OPT_NEG(unset);
5000 if (!strcmp(opt->long_name, "cumulative")) {
5001 if (arg)
5002 BUG("how come --cumulative take a value?");
5003 arg = "cumulative";
5004 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
5005 parse_dirstat_opt(options, "files");
5006 parse_dirstat_opt(options, arg ? arg : "");
5007 return 0;
5008 }
5009
5010 static int diff_opt_find_copies(const struct option *opt,
5011 const char *arg, int unset)
5012 {
5013 struct diff_options *options = opt->value;
5014
5015 BUG_ON_OPT_NEG(unset);
5016 if (!arg)
5017 arg = "";
5018 options->rename_score = parse_rename_score(&arg);
5019 if (*arg != 0)
5020 return error(_("invalid argument to %s"), opt->long_name);
5021
5022 if (options->detect_rename == DIFF_DETECT_COPY)
5023 options->flags.find_copies_harder = 1;
5024 else
5025 options->detect_rename = DIFF_DETECT_COPY;
5026
5027 return 0;
5028 }
5029
5030 static int diff_opt_find_renames(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 (!arg)
5037 arg = "";
5038 options->rename_score = parse_rename_score(&arg);
5039 if (*arg != 0)
5040 return error(_("invalid argument to %s"), opt->long_name);
5041
5042 options->detect_rename = DIFF_DETECT_RENAME;
5043 return 0;
5044 }
5045
5046 static int diff_opt_follow(const struct option *opt,
5047 const char *arg, int unset)
5048 {
5049 struct diff_options *options = opt->value;
5050
5051 BUG_ON_OPT_ARG(arg);
5052 if (unset) {
5053 options->flags.follow_renames = 0;
5054 options->flags.default_follow_renames = 0;
5055 } else {
5056 options->flags.follow_renames = 1;
5057 }
5058 return 0;
5059 }
5060
5061 static int diff_opt_ignore_submodules(const struct option *opt,
5062 const char *arg, int unset)
5063 {
5064 struct diff_options *options = opt->value;
5065
5066 BUG_ON_OPT_NEG(unset);
5067 if (!arg)
5068 arg = "all";
5069 options->flags.override_submodule_config = 1;
5070 handle_ignore_submodules_arg(options, arg);
5071 return 0;
5072 }
5073
5074 static int diff_opt_line_prefix(const struct option *opt,
5075 const char *optarg, int unset)
5076 {
5077 struct diff_options *options = opt->value;
5078
5079 BUG_ON_OPT_NEG(unset);
5080 options->line_prefix = optarg;
5081 options->line_prefix_length = strlen(options->line_prefix);
5082 graph_setup_line_prefix(options);
5083 return 0;
5084 }
5085
5086 static int diff_opt_no_prefix(const struct option *opt,
5087 const char *optarg, int unset)
5088 {
5089 struct diff_options *options = opt->value;
5090
5091 BUG_ON_OPT_NEG(unset);
5092 BUG_ON_OPT_ARG(optarg);
5093 options->a_prefix = "";
5094 options->b_prefix = "";
5095 return 0;
5096 }
5097
5098 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
5099 const struct option *opt,
5100 const char *arg, int unset)
5101 {
5102 struct diff_options *options = opt->value;
5103 char *path;
5104
5105 BUG_ON_OPT_NEG(unset);
5106 path = prefix_filename(ctx->prefix, arg);
5107 options->file = xfopen(path, "w");
5108 options->close_file = 1;
5109 if (options->use_color != GIT_COLOR_ALWAYS)
5110 options->use_color = GIT_COLOR_NEVER;
5111 free(path);
5112 return 0;
5113 }
5114
5115 static int diff_opt_patience(const struct option *opt,
5116 const char *arg, int unset)
5117 {
5118 struct diff_options *options = opt->value;
5119 int i;
5120
5121 BUG_ON_OPT_NEG(unset);
5122 BUG_ON_OPT_ARG(arg);
5123 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5124 /*
5125 * Both --patience and --anchored use PATIENCE_DIFF
5126 * internally, so remove any anchors previously
5127 * specified.
5128 */
5129 for (i = 0; i < options->anchors_nr; i++)
5130 free(options->anchors[i]);
5131 options->anchors_nr = 0;
5132 return 0;
5133 }
5134
5135 static int diff_opt_pickaxe_regex(const struct option *opt,
5136 const char *arg, int unset)
5137 {
5138 struct diff_options *options = opt->value;
5139
5140 BUG_ON_OPT_NEG(unset);
5141 options->pickaxe = arg;
5142 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5143 return 0;
5144 }
5145
5146 static int diff_opt_pickaxe_string(const struct option *opt,
5147 const char *arg, int unset)
5148 {
5149 struct diff_options *options = opt->value;
5150
5151 BUG_ON_OPT_NEG(unset);
5152 options->pickaxe = arg;
5153 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5154 return 0;
5155 }
5156
5157 static int diff_opt_relative(const struct option *opt,
5158 const char *arg, int unset)
5159 {
5160 struct diff_options *options = opt->value;
5161
5162 BUG_ON_OPT_NEG(unset);
5163 options->flags.relative_name = 1;
5164 if (arg)
5165 options->prefix = arg;
5166 return 0;
5167 }
5168
5169 static int diff_opt_submodule(const struct option *opt,
5170 const char *arg, int unset)
5171 {
5172 struct diff_options *options = opt->value;
5173
5174 BUG_ON_OPT_NEG(unset);
5175 if (!arg)
5176 arg = "log";
5177 if (parse_submodule_params(options, arg))
5178 return error(_("failed to parse --submodule option parameter: '%s'"),
5179 arg);
5180 return 0;
5181 }
5182
5183 static int diff_opt_textconv(const struct option *opt,
5184 const char *arg, int unset)
5185 {
5186 struct diff_options *options = opt->value;
5187
5188 BUG_ON_OPT_ARG(arg);
5189 if (unset) {
5190 options->flags.allow_textconv = 0;
5191 } else {
5192 options->flags.allow_textconv = 1;
5193 options->flags.textconv_set_via_cmdline = 1;
5194 }
5195 return 0;
5196 }
5197
5198 static int diff_opt_unified(const struct option *opt,
5199 const char *arg, int unset)
5200 {
5201 struct diff_options *options = opt->value;
5202 char *s;
5203
5204 BUG_ON_OPT_NEG(unset);
5205
5206 if (arg) {
5207 options->context = strtol(arg, &s, 10);
5208 if (*s)
5209 return error(_("%s expects a numerical value"), "--unified");
5210 }
5211 enable_patch_output(&options->output_format);
5212
5213 return 0;
5214 }
5215
5216 static int diff_opt_word_diff(const struct option *opt,
5217 const char *arg, int unset)
5218 {
5219 struct diff_options *options = opt->value;
5220
5221 BUG_ON_OPT_NEG(unset);
5222 if (arg) {
5223 if (!strcmp(arg, "plain"))
5224 options->word_diff = DIFF_WORDS_PLAIN;
5225 else if (!strcmp(arg, "color")) {
5226 options->use_color = 1;
5227 options->word_diff = DIFF_WORDS_COLOR;
5228 }
5229 else if (!strcmp(arg, "porcelain"))
5230 options->word_diff = DIFF_WORDS_PORCELAIN;
5231 else if (!strcmp(arg, "none"))
5232 options->word_diff = DIFF_WORDS_NONE;
5233 else
5234 return error(_("bad --word-diff argument: %s"), arg);
5235 } else {
5236 if (options->word_diff == DIFF_WORDS_NONE)
5237 options->word_diff = DIFF_WORDS_PLAIN;
5238 }
5239 return 0;
5240 }
5241
5242 static int diff_opt_word_diff_regex(const struct option *opt,
5243 const char *arg, int unset)
5244 {
5245 struct diff_options *options = opt->value;
5246
5247 BUG_ON_OPT_NEG(unset);
5248 if (options->word_diff == DIFF_WORDS_NONE)
5249 options->word_diff = DIFF_WORDS_PLAIN;
5250 options->word_regex = arg;
5251 return 0;
5252 }
5253
5254 static void prep_parse_options(struct diff_options *options)
5255 {
5256 struct option parseopts[] = {
5257 OPT_GROUP(N_("Diff output format options")),
5258 OPT_BITOP('p', "patch", &options->output_format,
5259 N_("generate patch"),
5260 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5261 OPT_BIT_F('s', "no-patch", &options->output_format,
5262 N_("suppress diff output"),
5263 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
5264 OPT_BITOP('u', NULL, &options->output_format,
5265 N_("generate patch"),
5266 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5267 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
5268 N_("generate diffs with <n> lines context"),
5269 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
5270 OPT_BOOL('W', "function-context", &options->flags.funccontext,
5271 N_("generate diffs with <n> lines context")),
5272 OPT_BIT_F(0, "raw", &options->output_format,
5273 N_("generate the diff in raw format"),
5274 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
5275 OPT_BITOP(0, "patch-with-raw", &options->output_format,
5276 N_("synonym for '-p --raw'"),
5277 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
5278 DIFF_FORMAT_NO_OUTPUT),
5279 OPT_BITOP(0, "patch-with-stat", &options->output_format,
5280 N_("synonym for '-p --stat'"),
5281 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
5282 DIFF_FORMAT_NO_OUTPUT),
5283 OPT_BIT_F(0, "numstat", &options->output_format,
5284 N_("machine friendly --stat"),
5285 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
5286 OPT_BIT_F(0, "shortstat", &options->output_format,
5287 N_("output only the last line of --stat"),
5288 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
5289 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
5290 N_("output the distribution of relative amount of changes for each sub-directory"),
5291 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5292 diff_opt_dirstat),
5293 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5294 N_("synonym for --dirstat=cumulative"),
5295 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5296 diff_opt_dirstat),
5297 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5298 N_("synonym for --dirstat=files,param1,param2..."),
5299 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5300 diff_opt_dirstat),
5301 OPT_BIT_F(0, "check", &options->output_format,
5302 N_("warn if changes introduce conflict markers or whitespace errors"),
5303 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
5304 OPT_BIT_F(0, "summary", &options->output_format,
5305 N_("condensed summary such as creations, renames and mode changes"),
5306 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
5307 OPT_BIT_F(0, "name-only", &options->output_format,
5308 N_("show only names of changed files"),
5309 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
5310 OPT_BIT_F(0, "name-status", &options->output_format,
5311 N_("show only names and status of changed files"),
5312 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
5313 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5314 N_("generate diffstat"),
5315 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5316 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5317 N_("generate diffstat with a given width"),
5318 PARSE_OPT_NONEG, diff_opt_stat),
5319 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5320 N_("generate diffstat with a given name width"),
5321 PARSE_OPT_NONEG, diff_opt_stat),
5322 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5323 N_("generate diffstat with a given graph width"),
5324 PARSE_OPT_NONEG, diff_opt_stat),
5325 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5326 N_("generate diffstat with limited lines"),
5327 PARSE_OPT_NONEG, diff_opt_stat),
5328 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5329 N_("generate compact summary in diffstat"),
5330 PARSE_OPT_NOARG, diff_opt_compact_summary),
5331 OPT_CALLBACK_F(0, "binary", options, NULL,
5332 N_("output a binary diff that can be applied"),
5333 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
5334 OPT_BOOL(0, "full-index", &options->flags.full_index,
5335 N_("show full pre- and post-image object names on the \"index\" lines")),
5336 OPT_COLOR_FLAG(0, "color", &options->use_color,
5337 N_("show colored diff")),
5338 OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
5339 N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
5340 PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
5341 OPT_SET_INT('z', NULL, &options->line_termination,
5342 N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
5343 0),
5344 OPT__ABBREV(&options->abbrev),
5345 OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
5346 N_("show the given source prefix instead of \"a/\""),
5347 PARSE_OPT_NONEG),
5348 OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
5349 N_("show the given destination prefix instead of \"b/\""),
5350 PARSE_OPT_NONEG),
5351 OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
5352 N_("prepend an additional prefix to every line of output"),
5353 PARSE_OPT_NONEG, diff_opt_line_prefix),
5354 OPT_CALLBACK_F(0, "no-prefix", options, NULL,
5355 N_("do not show any source or destination prefix"),
5356 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
5357 OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
5358 N_("show context between diff hunks up to the specified number of lines"),
5359 PARSE_OPT_NONEG),
5360 OPT_CALLBACK_F(0, "output-indicator-new",
5361 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5362 N_("<char>"),
5363 N_("specify the character to indicate a new line instead of '+'"),
5364 PARSE_OPT_NONEG, diff_opt_char),
5365 OPT_CALLBACK_F(0, "output-indicator-old",
5366 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5367 N_("<char>"),
5368 N_("specify the character to indicate an old line instead of '-'"),
5369 PARSE_OPT_NONEG, diff_opt_char),
5370 OPT_CALLBACK_F(0, "output-indicator-context",
5371 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5372 N_("<char>"),
5373 N_("specify the character to indicate a context instead of ' '"),
5374 PARSE_OPT_NONEG, diff_opt_char),
5375
5376 OPT_GROUP(N_("Diff rename options")),
5377 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5378 N_("break complete rewrite changes into pairs of delete and create"),
5379 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5380 diff_opt_break_rewrites),
5381 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5382 N_("detect renames"),
5383 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5384 diff_opt_find_renames),
5385 OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
5386 N_("omit the preimage for deletes"),
5387 1, PARSE_OPT_NONEG),
5388 OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
5389 N_("detect copies"),
5390 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5391 diff_opt_find_copies),
5392 OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
5393 N_("use unmodified files as source to find copies")),
5394 OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
5395 N_("disable rename detection"),
5396 0, PARSE_OPT_NONEG),
5397 OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
5398 N_("use empty blobs as rename source")),
5399 OPT_CALLBACK_F(0, "follow", options, NULL,
5400 N_("continue listing the history of a file beyond renames"),
5401 PARSE_OPT_NOARG, diff_opt_follow),
5402 OPT_INTEGER('l', NULL, &options->rename_limit,
5403 N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
5404
5405 OPT_GROUP(N_("Diff algorithm options")),
5406 OPT_BIT(0, "minimal", &options->xdl_opts,
5407 N_("produce the smallest possible diff"),
5408 XDF_NEED_MINIMAL),
5409 OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
5410 N_("ignore whitespace when comparing lines"),
5411 XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
5412 OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
5413 N_("ignore changes in amount of whitespace"),
5414 XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
5415 OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
5416 N_("ignore changes in whitespace at EOL"),
5417 XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
5418 OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
5419 N_("ignore carrier-return at the end of line"),
5420 XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
5421 OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
5422 N_("ignore changes whose lines are all blank"),
5423 XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
5424 OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
5425 N_("heuristic to shift diff hunk boundaries for easy reading"),
5426 XDF_INDENT_HEURISTIC),
5427 OPT_CALLBACK_F(0, "patience", options, NULL,
5428 N_("generate diff using the \"patience diff\" algorithm"),
5429 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5430 diff_opt_patience),
5431 OPT_BITOP(0, "histogram", &options->xdl_opts,
5432 N_("generate diff using the \"histogram diff\" algorithm"),
5433 XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
5434 OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
5435 N_("choose a diff algorithm"),
5436 PARSE_OPT_NONEG, diff_opt_diff_algorithm),
5437 OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
5438 N_("generate diff using the \"anchored diff\" algorithm"),
5439 PARSE_OPT_NONEG, diff_opt_anchored),
5440 OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
5441 N_("show word diff, using <mode> to delimit changed words"),
5442 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
5443 OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
5444 N_("use <regex> to decide what a word is"),
5445 PARSE_OPT_NONEG, diff_opt_word_diff_regex),
5446 OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
5447 N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
5448 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
5449 OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
5450 N_("moved lines of code are colored differently"),
5451 PARSE_OPT_OPTARG, diff_opt_color_moved),
5452 OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
5453 N_("how white spaces are ignored in --color-moved"),
5454 0, diff_opt_color_moved_ws),
5455
5456 OPT_GROUP(N_("Other diff options")),
5457 OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
5458 N_("when run from subdir, exclude changes outside and show relative paths"),
5459 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5460 diff_opt_relative),
5461 OPT_BOOL('a', "text", &options->flags.text,
5462 N_("treat all files as text")),
5463 OPT_BOOL('R', NULL, &options->flags.reverse_diff,
5464 N_("swap two inputs, reverse the diff")),
5465 OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
5466 N_("exit with 1 if there were differences, 0 otherwise")),
5467 OPT_BOOL(0, "quiet", &options->flags.quick,
5468 N_("disable all output of the program")),
5469 OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
5470 N_("allow an external diff helper to be executed")),
5471 OPT_CALLBACK_F(0, "textconv", options, NULL,
5472 N_("run external text conversion filters when comparing binary files"),
5473 PARSE_OPT_NOARG, diff_opt_textconv),
5474 OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
5475 N_("ignore changes to submodules in the diff generation"),
5476 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5477 diff_opt_ignore_submodules),
5478 OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
5479 N_("specify how differences in submodules are shown"),
5480 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5481 diff_opt_submodule),
5482 OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
5483 N_("hide 'git add -N' entries from the index"),
5484 1, PARSE_OPT_NONEG),
5485 OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
5486 N_("treat 'git add -N' entries as real in the index"),
5487 0, PARSE_OPT_NONEG),
5488 OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
5489 N_("look for differences that change the number of occurrences of the specified string"),
5490 0, diff_opt_pickaxe_string),
5491 OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
5492 N_("look for differences that change the number of occurrences of the specified regex"),
5493 0, diff_opt_pickaxe_regex),
5494 OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
5495 N_("show all changes in the changeset with -S or -G"),
5496 DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
5497 OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
5498 N_("treat <string> in -S as extended POSIX regular expression"),
5499 DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
5500 OPT_FILENAME('O', NULL, &options->orderfile,
5501 N_("control the order in which files appear in the output")),
5502 OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
5503 N_("look for differences that change the number of occurrences of the specified object"),
5504 PARSE_OPT_NONEG, diff_opt_find_object),
5505 OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
5506 N_("select files by diff type"),
5507 PARSE_OPT_NONEG, diff_opt_diff_filter),
5508 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5509 N_("Output to a specific file"),
5510 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5511
5512 OPT_END()
5513 };
5514
5515 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5516 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5517 }
5518
5519 int diff_opt_parse(struct diff_options *options,
5520 const char **av, int ac, const char *prefix)
5521 {
5522 if (!prefix)
5523 prefix = "";
5524
5525 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5526 PARSE_OPT_KEEP_DASHDASH |
5527 PARSE_OPT_KEEP_UNKNOWN |
5528 PARSE_OPT_NO_INTERNAL_HELP |
5529 PARSE_OPT_ONE_SHOT |
5530 PARSE_OPT_STOP_AT_NON_OPTION);
5531
5532 return ac;
5533 }
5534
5535 int parse_rename_score(const char **cp_p)
5536 {
5537 unsigned long num, scale;
5538 int ch, dot;
5539 const char *cp = *cp_p;
5540
5541 num = 0;
5542 scale = 1;
5543 dot = 0;
5544 for (;;) {
5545 ch = *cp;
5546 if ( !dot && ch == '.' ) {
5547 scale = 1;
5548 dot = 1;
5549 } else if ( ch == '%' ) {
5550 scale = dot ? scale*100 : 100;
5551 cp++; /* % is always at the end */
5552 break;
5553 } else if ( ch >= '0' && ch <= '9' ) {
5554 if ( scale < 100000 ) {
5555 scale *= 10;
5556 num = (num*10) + (ch-'0');
5557 }
5558 } else {
5559 break;
5560 }
5561 cp++;
5562 }
5563 *cp_p = cp;
5564
5565 /* user says num divided by scale and we say internally that
5566 * is MAX_SCORE * num / scale.
5567 */
5568 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5569 }
5570
5571 struct diff_queue_struct diff_queued_diff;
5572
5573 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5574 {
5575 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5576 queue->queue[queue->nr++] = dp;
5577 }
5578
5579 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5580 struct diff_filespec *one,
5581 struct diff_filespec *two)
5582 {
5583 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5584 dp->one = one;
5585 dp->two = two;
5586 if (queue)
5587 diff_q(queue, dp);
5588 return dp;
5589 }
5590
5591 void diff_free_filepair(struct diff_filepair *p)
5592 {
5593 free_filespec(p->one);
5594 free_filespec(p->two);
5595 free(p);
5596 }
5597
5598 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5599 {
5600 int abblen;
5601 const char *abbrev;
5602
5603 /* Do we want all 40 hex characters? */
5604 if (len == the_hash_algo->hexsz)
5605 return oid_to_hex(oid);
5606
5607 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5608 abbrev = diff_abbrev_oid(oid, len);
5609
5610 if (!print_sha1_ellipsis())
5611 return abbrev;
5612
5613 abblen = strlen(abbrev);
5614
5615 /*
5616 * In well-behaved cases, where the abbreviated result is the
5617 * same as the requested length, append three dots after the
5618 * abbreviation (hence the whole logic is limited to the case
5619 * where abblen < 37); when the actual abbreviated result is a
5620 * bit longer than the requested length, we reduce the number
5621 * of dots so that they match the well-behaved ones. However,
5622 * if the actual abbreviation is longer than the requested
5623 * length by more than three, we give up on aligning, and add
5624 * three dots anyway, to indicate that the output is not the
5625 * full object name. Yes, this may be suboptimal, but this
5626 * appears only in "diff --raw --abbrev" output and it is not
5627 * worth the effort to change it now. Note that this would
5628 * likely to work fine when the automatic sizing of default
5629 * abbreviation length is used--we would be fed -1 in "len" in
5630 * that case, and will end up always appending three-dots, but
5631 * the automatic sizing is supposed to give abblen that ensures
5632 * uniqueness across all objects (statistically speaking).
5633 */
5634 if (abblen < the_hash_algo->hexsz - 3) {
5635 static char hex[GIT_MAX_HEXSZ + 1];
5636 if (len < abblen && abblen <= len + 2)
5637 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5638 else
5639 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5640 return hex;
5641 }
5642
5643 return oid_to_hex(oid);
5644 }
5645
5646 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5647 {
5648 int line_termination = opt->line_termination;
5649 int inter_name_termination = line_termination ? '\t' : '\0';
5650
5651 fprintf(opt->file, "%s", diff_line_prefix(opt));
5652 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5653 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5654 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5655 fprintf(opt->file, "%s ",
5656 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5657 }
5658 if (p->score) {
5659 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5660 inter_name_termination);
5661 } else {
5662 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5663 }
5664
5665 if (p->status == DIFF_STATUS_COPIED ||
5666 p->status == DIFF_STATUS_RENAMED) {
5667 const char *name_a, *name_b;
5668 name_a = p->one->path;
5669 name_b = p->two->path;
5670 strip_prefix(opt->prefix_length, &name_a, &name_b);
5671 write_name_quoted(name_a, opt->file, inter_name_termination);
5672 write_name_quoted(name_b, opt->file, line_termination);
5673 } else {
5674 const char *name_a, *name_b;
5675 name_a = p->one->mode ? p->one->path : p->two->path;
5676 name_b = NULL;
5677 strip_prefix(opt->prefix_length, &name_a, &name_b);
5678 write_name_quoted(name_a, opt->file, line_termination);
5679 }
5680 }
5681
5682 int diff_unmodified_pair(struct diff_filepair *p)
5683 {
5684 /* This function is written stricter than necessary to support
5685 * the currently implemented transformers, but the idea is to
5686 * let transformers to produce diff_filepairs any way they want,
5687 * and filter and clean them up here before producing the output.
5688 */
5689 struct diff_filespec *one = p->one, *two = p->two;
5690
5691 if (DIFF_PAIR_UNMERGED(p))
5692 return 0; /* unmerged is interesting */
5693
5694 /* deletion, addition, mode or type change
5695 * and rename are all interesting.
5696 */
5697 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5698 DIFF_PAIR_MODE_CHANGED(p) ||
5699 strcmp(one->path, two->path))
5700 return 0;
5701
5702 /* both are valid and point at the same path. that is, we are
5703 * dealing with a change.
5704 */
5705 if (one->oid_valid && two->oid_valid &&
5706 oideq(&one->oid, &two->oid) &&
5707 !one->dirty_submodule && !two->dirty_submodule)
5708 return 1; /* no change */
5709 if (!one->oid_valid && !two->oid_valid)
5710 return 1; /* both look at the same file on the filesystem. */
5711 return 0;
5712 }
5713
5714 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5715 {
5716 if (diff_unmodified_pair(p))
5717 return;
5718
5719 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5720 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5721 return; /* no tree diffs in patch format */
5722
5723 run_diff(p, o);
5724 }
5725
5726 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5727 struct diffstat_t *diffstat)
5728 {
5729 if (diff_unmodified_pair(p))
5730 return;
5731
5732 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5733 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5734 return; /* no useful stat for tree diffs */
5735
5736 run_diffstat(p, o, diffstat);
5737 }
5738
5739 static void diff_flush_checkdiff(struct diff_filepair *p,
5740 struct diff_options *o)
5741 {
5742 if (diff_unmodified_pair(p))
5743 return;
5744
5745 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5746 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5747 return; /* nothing to check in tree diffs */
5748
5749 run_checkdiff(p, o);
5750 }
5751
5752 int diff_queue_is_empty(void)
5753 {
5754 struct diff_queue_struct *q = &diff_queued_diff;
5755 int i;
5756 for (i = 0; i < q->nr; i++)
5757 if (!diff_unmodified_pair(q->queue[i]))
5758 return 0;
5759 return 1;
5760 }
5761
5762 #if DIFF_DEBUG
5763 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5764 {
5765 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5766 x, one ? one : "",
5767 s->path,
5768 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5769 s->mode,
5770 s->oid_valid ? oid_to_hex(&s->oid) : "");
5771 fprintf(stderr, "queue[%d] %s size %lu\n",
5772 x, one ? one : "",
5773 s->size);
5774 }
5775
5776 void diff_debug_filepair(const struct diff_filepair *p, int i)
5777 {
5778 diff_debug_filespec(p->one, i, "one");
5779 diff_debug_filespec(p->two, i, "two");
5780 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5781 p->score, p->status ? p->status : '?',
5782 p->one->rename_used, p->broken_pair);
5783 }
5784
5785 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5786 {
5787 int i;
5788 if (msg)
5789 fprintf(stderr, "%s\n", msg);
5790 fprintf(stderr, "q->nr = %d\n", q->nr);
5791 for (i = 0; i < q->nr; i++) {
5792 struct diff_filepair *p = q->queue[i];
5793 diff_debug_filepair(p, i);
5794 }
5795 }
5796 #endif
5797
5798 static void diff_resolve_rename_copy(void)
5799 {
5800 int i;
5801 struct diff_filepair *p;
5802 struct diff_queue_struct *q = &diff_queued_diff;
5803
5804 diff_debug_queue("resolve-rename-copy", q);
5805
5806 for (i = 0; i < q->nr; i++) {
5807 p = q->queue[i];
5808 p->status = 0; /* undecided */
5809 if (DIFF_PAIR_UNMERGED(p))
5810 p->status = DIFF_STATUS_UNMERGED;
5811 else if (!DIFF_FILE_VALID(p->one))
5812 p->status = DIFF_STATUS_ADDED;
5813 else if (!DIFF_FILE_VALID(p->two))
5814 p->status = DIFF_STATUS_DELETED;
5815 else if (DIFF_PAIR_TYPE_CHANGED(p))
5816 p->status = DIFF_STATUS_TYPE_CHANGED;
5817
5818 /* from this point on, we are dealing with a pair
5819 * whose both sides are valid and of the same type, i.e.
5820 * either in-place edit or rename/copy edit.
5821 */
5822 else if (DIFF_PAIR_RENAME(p)) {
5823 /*
5824 * A rename might have re-connected a broken
5825 * pair up, causing the pathnames to be the
5826 * same again. If so, that's not a rename at
5827 * all, just a modification..
5828 *
5829 * Otherwise, see if this source was used for
5830 * multiple renames, in which case we decrement
5831 * the count, and call it a copy.
5832 */
5833 if (!strcmp(p->one->path, p->two->path))
5834 p->status = DIFF_STATUS_MODIFIED;
5835 else if (--p->one->rename_used > 0)
5836 p->status = DIFF_STATUS_COPIED;
5837 else
5838 p->status = DIFF_STATUS_RENAMED;
5839 }
5840 else if (!oideq(&p->one->oid, &p->two->oid) ||
5841 p->one->mode != p->two->mode ||
5842 p->one->dirty_submodule ||
5843 p->two->dirty_submodule ||
5844 is_null_oid(&p->one->oid))
5845 p->status = DIFF_STATUS_MODIFIED;
5846 else {
5847 /* This is a "no-change" entry and should not
5848 * happen anymore, but prepare for broken callers.
5849 */
5850 error("feeding unmodified %s to diffcore",
5851 p->one->path);
5852 p->status = DIFF_STATUS_UNKNOWN;
5853 }
5854 }
5855 diff_debug_queue("resolve-rename-copy done", q);
5856 }
5857
5858 static int check_pair_status(struct diff_filepair *p)
5859 {
5860 switch (p->status) {
5861 case DIFF_STATUS_UNKNOWN:
5862 return 0;
5863 case 0:
5864 die("internal error in diff-resolve-rename-copy");
5865 default:
5866 return 1;
5867 }
5868 }
5869
5870 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5871 {
5872 int fmt = opt->output_format;
5873
5874 if (fmt & DIFF_FORMAT_CHECKDIFF)
5875 diff_flush_checkdiff(p, opt);
5876 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5877 diff_flush_raw(p, opt);
5878 else if (fmt & DIFF_FORMAT_NAME) {
5879 const char *name_a, *name_b;
5880 name_a = p->two->path;
5881 name_b = NULL;
5882 strip_prefix(opt->prefix_length, &name_a, &name_b);
5883 fprintf(opt->file, "%s", diff_line_prefix(opt));
5884 write_name_quoted(name_a, opt->file, opt->line_termination);
5885 }
5886 }
5887
5888 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5889 {
5890 struct strbuf sb = STRBUF_INIT;
5891 if (fs->mode)
5892 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5893 else
5894 strbuf_addf(&sb, " %s ", newdelete);
5895
5896 quote_c_style(fs->path, &sb, NULL, 0);
5897 strbuf_addch(&sb, '\n');
5898 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5899 sb.buf, sb.len, 0);
5900 strbuf_release(&sb);
5901 }
5902
5903 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5904 int show_name)
5905 {
5906 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5907 struct strbuf sb = STRBUF_INIT;
5908 strbuf_addf(&sb, " mode change %06o => %06o",
5909 p->one->mode, p->two->mode);
5910 if (show_name) {
5911 strbuf_addch(&sb, ' ');
5912 quote_c_style(p->two->path, &sb, NULL, 0);
5913 }
5914 strbuf_addch(&sb, '\n');
5915 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5916 sb.buf, sb.len, 0);
5917 strbuf_release(&sb);
5918 }
5919 }
5920
5921 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5922 struct diff_filepair *p)
5923 {
5924 struct strbuf sb = STRBUF_INIT;
5925 struct strbuf names = STRBUF_INIT;
5926
5927 pprint_rename(&names, p->one->path, p->two->path);
5928 strbuf_addf(&sb, " %s %s (%d%%)\n",
5929 renamecopy, names.buf, similarity_index(p));
5930 strbuf_release(&names);
5931 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5932 sb.buf, sb.len, 0);
5933 show_mode_change(opt, p, 0);
5934 strbuf_release(&sb);
5935 }
5936
5937 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5938 {
5939 switch(p->status) {
5940 case DIFF_STATUS_DELETED:
5941 show_file_mode_name(opt, "delete", p->one);
5942 break;
5943 case DIFF_STATUS_ADDED:
5944 show_file_mode_name(opt, "create", p->two);
5945 break;
5946 case DIFF_STATUS_COPIED:
5947 show_rename_copy(opt, "copy", p);
5948 break;
5949 case DIFF_STATUS_RENAMED:
5950 show_rename_copy(opt, "rename", p);
5951 break;
5952 default:
5953 if (p->score) {
5954 struct strbuf sb = STRBUF_INIT;
5955 strbuf_addstr(&sb, " rewrite ");
5956 quote_c_style(p->two->path, &sb, NULL, 0);
5957 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5958 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5959 sb.buf, sb.len, 0);
5960 strbuf_release(&sb);
5961 }
5962 show_mode_change(opt, p, !p->score);
5963 break;
5964 }
5965 }
5966
5967 struct patch_id_t {
5968 git_hash_ctx *ctx;
5969 int patchlen;
5970 };
5971
5972 static int remove_space(char *line, int len)
5973 {
5974 int i;
5975 char *dst = line;
5976 unsigned char c;
5977
5978 for (i = 0; i < len; i++)
5979 if (!isspace((c = line[i])))
5980 *dst++ = c;
5981
5982 return dst - line;
5983 }
5984
5985 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
5986 {
5987 unsigned char hash[GIT_MAX_RAWSZ];
5988 unsigned short carry = 0;
5989 int i;
5990
5991 the_hash_algo->final_fn(hash, ctx);
5992 the_hash_algo->init_fn(ctx);
5993 /* 20-byte sum, with carry */
5994 for (i = 0; i < the_hash_algo->rawsz; ++i) {
5995 carry += result->hash[i] + hash[i];
5996 result->hash[i] = carry;
5997 carry >>= 8;
5998 }
5999 }
6000
6001 static void patch_id_consume(void *priv, char *line, unsigned long len)
6002 {
6003 struct patch_id_t *data = priv;
6004 int new_len;
6005
6006 new_len = remove_space(line, len);
6007
6008 the_hash_algo->update_fn(data->ctx, line, new_len);
6009 data->patchlen += new_len;
6010 }
6011
6012 static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
6013 {
6014 the_hash_algo->update_fn(ctx, str, strlen(str));
6015 }
6016
6017 static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
6018 {
6019 /* large enough for 2^32 in octal */
6020 char buf[12];
6021 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
6022 the_hash_algo->update_fn(ctx, buf, len);
6023 }
6024
6025 /* returns 0 upon success, and writes result into oid */
6026 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6027 {
6028 struct diff_queue_struct *q = &diff_queued_diff;
6029 int i;
6030 git_hash_ctx ctx;
6031 struct patch_id_t data;
6032
6033 the_hash_algo->init_fn(&ctx);
6034 memset(&data, 0, sizeof(struct patch_id_t));
6035 data.ctx = &ctx;
6036 oidclr(oid);
6037
6038 for (i = 0; i < q->nr; i++) {
6039 xpparam_t xpp;
6040 xdemitconf_t xecfg;
6041 mmfile_t mf1, mf2;
6042 struct diff_filepair *p = q->queue[i];
6043 int len1, len2;
6044
6045 memset(&xpp, 0, sizeof(xpp));
6046 memset(&xecfg, 0, sizeof(xecfg));
6047 if (p->status == 0)
6048 return error("internal diff status error");
6049 if (p->status == DIFF_STATUS_UNKNOWN)
6050 continue;
6051 if (diff_unmodified_pair(p))
6052 continue;
6053 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
6054 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
6055 continue;
6056 if (DIFF_PAIR_UNMERGED(p))
6057 continue;
6058
6059 diff_fill_oid_info(p->one, options->repo->index);
6060 diff_fill_oid_info(p->two, options->repo->index);
6061
6062 len1 = remove_space(p->one->path, strlen(p->one->path));
6063 len2 = remove_space(p->two->path, strlen(p->two->path));
6064 patch_id_add_string(&ctx, "diff--git");
6065 patch_id_add_string(&ctx, "a/");
6066 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6067 patch_id_add_string(&ctx, "b/");
6068 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6069
6070 if (p->one->mode == 0) {
6071 patch_id_add_string(&ctx, "newfilemode");
6072 patch_id_add_mode(&ctx, p->two->mode);
6073 patch_id_add_string(&ctx, "---/dev/null");
6074 patch_id_add_string(&ctx, "+++b/");
6075 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6076 } else if (p->two->mode == 0) {
6077 patch_id_add_string(&ctx, "deletedfilemode");
6078 patch_id_add_mode(&ctx, p->one->mode);
6079 patch_id_add_string(&ctx, "---a/");
6080 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6081 patch_id_add_string(&ctx, "+++/dev/null");
6082 } else {
6083 patch_id_add_string(&ctx, "---a/");
6084 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6085 patch_id_add_string(&ctx, "+++b/");
6086 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6087 }
6088
6089 if (diff_header_only)
6090 continue;
6091
6092 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
6093 fill_mmfile(options->repo, &mf2, p->two) < 0)
6094 return error("unable to read files to diff");
6095
6096 if (diff_filespec_is_binary(options->repo, p->one) ||
6097 diff_filespec_is_binary(options->repo, p->two)) {
6098 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
6099 the_hash_algo->hexsz);
6100 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
6101 the_hash_algo->hexsz);
6102 continue;
6103 }
6104
6105 xpp.flags = 0;
6106 xecfg.ctxlen = 3;
6107 xecfg.flags = 0;
6108 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
6109 patch_id_consume, &data, &xpp, &xecfg))
6110 return error("unable to generate patch-id diff for %s",
6111 p->one->path);
6112
6113 if (stable)
6114 flush_one_hunk(oid, &ctx);
6115 }
6116
6117 if (!stable)
6118 the_hash_algo->final_fn(oid->hash, &ctx);
6119
6120 return 0;
6121 }
6122
6123 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6124 {
6125 struct diff_queue_struct *q = &diff_queued_diff;
6126 int i;
6127 int result = diff_get_patch_id(options, oid, diff_header_only, stable);
6128
6129 for (i = 0; i < q->nr; i++)
6130 diff_free_filepair(q->queue[i]);
6131
6132 free(q->queue);
6133 DIFF_QUEUE_CLEAR(q);
6134
6135 return result;
6136 }
6137
6138 static int is_summary_empty(const struct diff_queue_struct *q)
6139 {
6140 int i;
6141
6142 for (i = 0; i < q->nr; i++) {
6143 const struct diff_filepair *p = q->queue[i];
6144
6145 switch (p->status) {
6146 case DIFF_STATUS_DELETED:
6147 case DIFF_STATUS_ADDED:
6148 case DIFF_STATUS_COPIED:
6149 case DIFF_STATUS_RENAMED:
6150 return 0;
6151 default:
6152 if (p->score)
6153 return 0;
6154 if (p->one->mode && p->two->mode &&
6155 p->one->mode != p->two->mode)
6156 return 0;
6157 break;
6158 }
6159 }
6160 return 1;
6161 }
6162
6163 static const char rename_limit_warning[] =
6164 N_("inexact rename detection was skipped due to too many files.");
6165
6166 static const char degrade_cc_to_c_warning[] =
6167 N_("only found copies from modified paths due to too many files.");
6168
6169 static const char rename_limit_advice[] =
6170 N_("you may want to set your %s variable to at least "
6171 "%d and retry the command.");
6172
6173 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
6174 {
6175 fflush(stdout);
6176 if (degraded_cc)
6177 warning(_(degrade_cc_to_c_warning));
6178 else if (needed)
6179 warning(_(rename_limit_warning));
6180 else
6181 return;
6182 if (0 < needed)
6183 warning(_(rename_limit_advice), varname, needed);
6184 }
6185
6186 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
6187 {
6188 int i;
6189 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
6190 struct diff_queue_struct *q = &diff_queued_diff;
6191
6192 if (WSEH_NEW & WS_RULE_MASK)
6193 BUG("WS rules bit mask overlaps with diff symbol flags");
6194
6195 if (o->color_moved)
6196 o->emitted_symbols = &esm;
6197
6198 for (i = 0; i < q->nr; i++) {
6199 struct diff_filepair *p = q->queue[i];
6200 if (check_pair_status(p))
6201 diff_flush_patch(p, o);
6202 }
6203
6204 if (o->emitted_symbols) {
6205 if (o->color_moved) {
6206 struct hashmap add_lines, del_lines;
6207
6208 if (o->color_moved_ws_handling &
6209 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
6210 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
6211
6212 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
6213 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
6214
6215 add_lines_to_move_detection(o, &add_lines, &del_lines);
6216 mark_color_as_moved(o, &add_lines, &del_lines);
6217 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6218 dim_moved_lines(o);
6219
6220 hashmap_free_entries(&add_lines, struct moved_entry,
6221 ent);
6222 hashmap_free_entries(&del_lines, struct moved_entry,
6223 ent);
6224 }
6225
6226 for (i = 0; i < esm.nr; i++)
6227 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6228
6229 for (i = 0; i < esm.nr; i++)
6230 free((void *)esm.buf[i].line);
6231 esm.nr = 0;
6232
6233 o->emitted_symbols = NULL;
6234 }
6235 }
6236
6237 void diff_flush(struct diff_options *options)
6238 {
6239 struct diff_queue_struct *q = &diff_queued_diff;
6240 int i, output_format = options->output_format;
6241 int separator = 0;
6242 int dirstat_by_line = 0;
6243
6244 /*
6245 * Order: raw, stat, summary, patch
6246 * or: name/name-status/checkdiff (other bits clear)
6247 */
6248 if (!q->nr)
6249 goto free_queue;
6250
6251 if (output_format & (DIFF_FORMAT_RAW |
6252 DIFF_FORMAT_NAME |
6253 DIFF_FORMAT_NAME_STATUS |
6254 DIFF_FORMAT_CHECKDIFF)) {
6255 for (i = 0; i < q->nr; i++) {
6256 struct diff_filepair *p = q->queue[i];
6257 if (check_pair_status(p))
6258 flush_one_pair(p, options);
6259 }
6260 separator++;
6261 }
6262
6263 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
6264 dirstat_by_line = 1;
6265
6266 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6267 dirstat_by_line) {
6268 struct diffstat_t diffstat;
6269
6270 compute_diffstat(options, &diffstat, q);
6271 if (output_format & DIFF_FORMAT_NUMSTAT)
6272 show_numstat(&diffstat, options);
6273 if (output_format & DIFF_FORMAT_DIFFSTAT)
6274 show_stats(&diffstat, options);
6275 if (output_format & DIFF_FORMAT_SHORTSTAT)
6276 show_shortstats(&diffstat, options);
6277 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
6278 show_dirstat_by_line(&diffstat, options);
6279 free_diffstat_info(&diffstat);
6280 separator++;
6281 }
6282 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
6283 show_dirstat(options);
6284
6285 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
6286 for (i = 0; i < q->nr; i++) {
6287 diff_summary(options, q->queue[i]);
6288 }
6289 separator++;
6290 }
6291
6292 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
6293 options->flags.exit_with_status &&
6294 options->flags.diff_from_contents) {
6295 /*
6296 * run diff_flush_patch for the exit status. setting
6297 * options->file to /dev/null should be safe, because we
6298 * aren't supposed to produce any output anyway.
6299 */
6300 if (options->close_file)
6301 fclose(options->file);
6302 options->file = xfopen("/dev/null", "w");
6303 options->close_file = 1;
6304 options->color_moved = 0;
6305 for (i = 0; i < q->nr; i++) {
6306 struct diff_filepair *p = q->queue[i];
6307 if (check_pair_status(p))
6308 diff_flush_patch(p, options);
6309 if (options->found_changes)
6310 break;
6311 }
6312 }
6313
6314 if (output_format & DIFF_FORMAT_PATCH) {
6315 if (separator) {
6316 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
6317 if (options->stat_sep)
6318 /* attach patch instead of inline */
6319 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6320 NULL, 0, 0);
6321 }
6322
6323 diff_flush_patch_all_file_pairs(options);
6324 }
6325
6326 if (output_format & DIFF_FORMAT_CALLBACK)
6327 options->format_callback(q, options, options->format_callback_data);
6328
6329 for (i = 0; i < q->nr; i++)
6330 diff_free_filepair(q->queue[i]);
6331 free_queue:
6332 free(q->queue);
6333 DIFF_QUEUE_CLEAR(q);
6334 if (options->close_file)
6335 fclose(options->file);
6336
6337 /*
6338 * Report the content-level differences with HAS_CHANGES;
6339 * diff_addremove/diff_change does not set the bit when
6340 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6341 */
6342 if (options->flags.diff_from_contents) {
6343 if (options->found_changes)
6344 options->flags.has_changes = 1;
6345 else
6346 options->flags.has_changes = 0;
6347 }
6348 }
6349
6350 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6351 {
6352 return (((p->status == DIFF_STATUS_MODIFIED) &&
6353 ((p->score &&
6354 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6355 (!p->score &&
6356 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6357 ((p->status != DIFF_STATUS_MODIFIED) &&
6358 filter_bit_tst(p->status, options)));
6359 }
6360
6361 static void diffcore_apply_filter(struct diff_options *options)
6362 {
6363 int i;
6364 struct diff_queue_struct *q = &diff_queued_diff;
6365 struct diff_queue_struct outq;
6366
6367 DIFF_QUEUE_CLEAR(&outq);
6368
6369 if (!options->filter)
6370 return;
6371
6372 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6373 int found;
6374 for (i = found = 0; !found && i < q->nr; i++) {
6375 if (match_filter(options, q->queue[i]))
6376 found++;
6377 }
6378 if (found)
6379 return;
6380
6381 /* otherwise we will clear the whole queue
6382 * by copying the empty outq at the end of this
6383 * function, but first clear the current entries
6384 * in the queue.
6385 */
6386 for (i = 0; i < q->nr; i++)
6387 diff_free_filepair(q->queue[i]);
6388 }
6389 else {
6390 /* Only the matching ones */
6391 for (i = 0; i < q->nr; i++) {
6392 struct diff_filepair *p = q->queue[i];
6393 if (match_filter(options, p))
6394 diff_q(&outq, p);
6395 else
6396 diff_free_filepair(p);
6397 }
6398 }
6399 free(q->queue);
6400 *q = outq;
6401 }
6402
6403 /* Check whether two filespecs with the same mode and size are identical */
6404 static int diff_filespec_is_identical(struct repository *r,
6405 struct diff_filespec *one,
6406 struct diff_filespec *two)
6407 {
6408 if (S_ISGITLINK(one->mode))
6409 return 0;
6410 if (diff_populate_filespec(r, one, 0))
6411 return 0;
6412 if (diff_populate_filespec(r, two, 0))
6413 return 0;
6414 return !memcmp(one->data, two->data, one->size);
6415 }
6416
6417 static int diff_filespec_check_stat_unmatch(struct repository *r,
6418 struct diff_filepair *p)
6419 {
6420 if (p->done_skip_stat_unmatch)
6421 return p->skip_stat_unmatch_result;
6422
6423 p->done_skip_stat_unmatch = 1;
6424 p->skip_stat_unmatch_result = 0;
6425 /*
6426 * 1. Entries that come from stat info dirtiness
6427 * always have both sides (iow, not create/delete),
6428 * one side of the object name is unknown, with
6429 * the same mode and size. Keep the ones that
6430 * do not match these criteria. They have real
6431 * differences.
6432 *
6433 * 2. At this point, the file is known to be modified,
6434 * with the same mode and size, and the object
6435 * name of one side is unknown. Need to inspect
6436 * the identical contents.
6437 */
6438 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6439 !DIFF_FILE_VALID(p->two) ||
6440 (p->one->oid_valid && p->two->oid_valid) ||
6441 (p->one->mode != p->two->mode) ||
6442 diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
6443 diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
6444 (p->one->size != p->two->size) ||
6445 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6446 p->skip_stat_unmatch_result = 1;
6447 return p->skip_stat_unmatch_result;
6448 }
6449
6450 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6451 {
6452 int i;
6453 struct diff_queue_struct *q = &diff_queued_diff;
6454 struct diff_queue_struct outq;
6455 DIFF_QUEUE_CLEAR(&outq);
6456
6457 for (i = 0; i < q->nr; i++) {
6458 struct diff_filepair *p = q->queue[i];
6459
6460 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6461 diff_q(&outq, p);
6462 else {
6463 /*
6464 * The caller can subtract 1 from skip_stat_unmatch
6465 * to determine how many paths were dirty only
6466 * due to stat info mismatch.
6467 */
6468 if (!diffopt->flags.no_index)
6469 diffopt->skip_stat_unmatch++;
6470 diff_free_filepair(p);
6471 }
6472 }
6473 free(q->queue);
6474 *q = outq;
6475 }
6476
6477 static int diffnamecmp(const void *a_, const void *b_)
6478 {
6479 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6480 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6481 const char *name_a, *name_b;
6482
6483 name_a = a->one ? a->one->path : a->two->path;
6484 name_b = b->one ? b->one->path : b->two->path;
6485 return strcmp(name_a, name_b);
6486 }
6487
6488 void diffcore_fix_diff_index(void)
6489 {
6490 struct diff_queue_struct *q = &diff_queued_diff;
6491 QSORT(q->queue, q->nr, diffnamecmp);
6492 }
6493
6494 static void add_if_missing(struct repository *r,
6495 struct oid_array *to_fetch,
6496 const struct diff_filespec *filespec)
6497 {
6498 if (filespec && filespec->oid_valid &&
6499 !S_ISGITLINK(filespec->mode) &&
6500 oid_object_info_extended(r, &filespec->oid, NULL,
6501 OBJECT_INFO_FOR_PREFETCH))
6502 oid_array_append(to_fetch, &filespec->oid);
6503 }
6504
6505 void diffcore_std(struct diff_options *options)
6506 {
6507 if (options->repo == the_repository && has_promisor_remote()) {
6508 /*
6509 * Prefetch the diff pairs that are about to be flushed.
6510 */
6511 int i;
6512 struct diff_queue_struct *q = &diff_queued_diff;
6513 struct oid_array to_fetch = OID_ARRAY_INIT;
6514
6515 for (i = 0; i < q->nr; i++) {
6516 struct diff_filepair *p = q->queue[i];
6517 add_if_missing(options->repo, &to_fetch, p->one);
6518 add_if_missing(options->repo, &to_fetch, p->two);
6519 }
6520 if (to_fetch.nr)
6521 /*
6522 * NEEDSWORK: Consider deduplicating the OIDs sent.
6523 */
6524 promisor_remote_get_direct(options->repo,
6525 to_fetch.oid, to_fetch.nr);
6526 oid_array_clear(&to_fetch);
6527 }
6528
6529 /* NOTE please keep the following in sync with diff_tree_combined() */
6530 if (options->skip_stat_unmatch)
6531 diffcore_skip_stat_unmatch(options);
6532 if (!options->found_follow) {
6533 /* See try_to_follow_renames() in tree-diff.c */
6534 if (options->break_opt != -1)
6535 diffcore_break(options->repo,
6536 options->break_opt);
6537 if (options->detect_rename)
6538 diffcore_rename(options);
6539 if (options->break_opt != -1)
6540 diffcore_merge_broken();
6541 }
6542 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6543 diffcore_pickaxe(options);
6544 if (options->orderfile)
6545 diffcore_order(options->orderfile);
6546 if (!options->found_follow)
6547 /* See try_to_follow_renames() in tree-diff.c */
6548 diff_resolve_rename_copy();
6549 diffcore_apply_filter(options);
6550
6551 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6552 options->flags.has_changes = 1;
6553 else
6554 options->flags.has_changes = 0;
6555
6556 options->found_follow = 0;
6557 }
6558
6559 int diff_result_code(struct diff_options *opt, int status)
6560 {
6561 int result = 0;
6562
6563 diff_warn_rename_limit("diff.renameLimit",
6564 opt->needed_rename_limit,
6565 opt->degraded_cc_to_c);
6566 if (!opt->flags.exit_with_status &&
6567 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6568 return status;
6569 if (opt->flags.exit_with_status &&
6570 opt->flags.has_changes)
6571 result |= 01;
6572 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6573 opt->flags.check_failed)
6574 result |= 02;
6575 return result;
6576 }
6577
6578 int diff_can_quit_early(struct diff_options *opt)
6579 {
6580 return (opt->flags.quick &&
6581 !opt->filter &&
6582 opt->flags.has_changes);
6583 }
6584
6585 /*
6586 * Shall changes to this submodule be ignored?
6587 *
6588 * Submodule changes can be configured to be ignored separately for each path,
6589 * but that configuration can be overridden from the command line.
6590 */
6591 static int is_submodule_ignored(const char *path, struct diff_options *options)
6592 {
6593 int ignored = 0;
6594 struct diff_flags orig_flags = options->flags;
6595 if (!options->flags.override_submodule_config)
6596 set_diffopt_flags_from_submodule_config(options, path);
6597 if (options->flags.ignore_submodules)
6598 ignored = 1;
6599 options->flags = orig_flags;
6600 return ignored;
6601 }
6602
6603 void compute_diffstat(struct diff_options *options,
6604 struct diffstat_t *diffstat,
6605 struct diff_queue_struct *q)
6606 {
6607 int i;
6608
6609 memset(diffstat, 0, sizeof(struct diffstat_t));
6610 for (i = 0; i < q->nr; i++) {
6611 struct diff_filepair *p = q->queue[i];
6612 if (check_pair_status(p))
6613 diff_flush_stat(p, options, diffstat);
6614 }
6615 }
6616
6617 void diff_addremove(struct diff_options *options,
6618 int addremove, unsigned mode,
6619 const struct object_id *oid,
6620 int oid_valid,
6621 const char *concatpath, unsigned dirty_submodule)
6622 {
6623 struct diff_filespec *one, *two;
6624
6625 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6626 return;
6627
6628 /* This may look odd, but it is a preparation for
6629 * feeding "there are unchanged files which should
6630 * not produce diffs, but when you are doing copy
6631 * detection you would need them, so here they are"
6632 * entries to the diff-core. They will be prefixed
6633 * with something like '=' or '*' (I haven't decided
6634 * which but should not make any difference).
6635 * Feeding the same new and old to diff_change()
6636 * also has the same effect.
6637 * Before the final output happens, they are pruned after
6638 * merged into rename/copy pairs as appropriate.
6639 */
6640 if (options->flags.reverse_diff)
6641 addremove = (addremove == '+' ? '-' :
6642 addremove == '-' ? '+' : addremove);
6643
6644 if (options->prefix &&
6645 strncmp(concatpath, options->prefix, options->prefix_length))
6646 return;
6647
6648 one = alloc_filespec(concatpath);
6649 two = alloc_filespec(concatpath);
6650
6651 if (addremove != '+')
6652 fill_filespec(one, oid, oid_valid, mode);
6653 if (addremove != '-') {
6654 fill_filespec(two, oid, oid_valid, mode);
6655 two->dirty_submodule = dirty_submodule;
6656 }
6657
6658 diff_queue(&diff_queued_diff, one, two);
6659 if (!options->flags.diff_from_contents)
6660 options->flags.has_changes = 1;
6661 }
6662
6663 void diff_change(struct diff_options *options,
6664 unsigned old_mode, unsigned new_mode,
6665 const struct object_id *old_oid,
6666 const struct object_id *new_oid,
6667 int old_oid_valid, int new_oid_valid,
6668 const char *concatpath,
6669 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6670 {
6671 struct diff_filespec *one, *two;
6672 struct diff_filepair *p;
6673
6674 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6675 is_submodule_ignored(concatpath, options))
6676 return;
6677
6678 if (options->flags.reverse_diff) {
6679 SWAP(old_mode, new_mode);
6680 SWAP(old_oid, new_oid);
6681 SWAP(old_oid_valid, new_oid_valid);
6682 SWAP(old_dirty_submodule, new_dirty_submodule);
6683 }
6684
6685 if (options->prefix &&
6686 strncmp(concatpath, options->prefix, options->prefix_length))
6687 return;
6688
6689 one = alloc_filespec(concatpath);
6690 two = alloc_filespec(concatpath);
6691 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6692 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6693 one->dirty_submodule = old_dirty_submodule;
6694 two->dirty_submodule = new_dirty_submodule;
6695 p = diff_queue(&diff_queued_diff, one, two);
6696
6697 if (options->flags.diff_from_contents)
6698 return;
6699
6700 if (options->flags.quick && options->skip_stat_unmatch &&
6701 !diff_filespec_check_stat_unmatch(options->repo, p))
6702 return;
6703
6704 options->flags.has_changes = 1;
6705 }
6706
6707 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6708 {
6709 struct diff_filepair *pair;
6710 struct diff_filespec *one, *two;
6711
6712 if (options->prefix &&
6713 strncmp(path, options->prefix, options->prefix_length))
6714 return NULL;
6715
6716 one = alloc_filespec(path);
6717 two = alloc_filespec(path);
6718 pair = diff_queue(&diff_queued_diff, one, two);
6719 pair->is_unmerged = 1;
6720 return pair;
6721 }
6722
6723 static char *run_textconv(struct repository *r,
6724 const char *pgm,
6725 struct diff_filespec *spec,
6726 size_t *outsize)
6727 {
6728 struct diff_tempfile *temp;
6729 const char *argv[3];
6730 const char **arg = argv;
6731 struct child_process child = CHILD_PROCESS_INIT;
6732 struct strbuf buf = STRBUF_INIT;
6733 int err = 0;
6734
6735 temp = prepare_temp_file(r, spec->path, spec);
6736 *arg++ = pgm;
6737 *arg++ = temp->name;
6738 *arg = NULL;
6739
6740 child.use_shell = 1;
6741 child.argv = argv;
6742 child.out = -1;
6743 if (start_command(&child)) {
6744 remove_tempfile();
6745 return NULL;
6746 }
6747
6748 if (strbuf_read(&buf, child.out, 0) < 0)
6749 err = error("error reading from textconv command '%s'", pgm);
6750 close(child.out);
6751
6752 if (finish_command(&child) || err) {
6753 strbuf_release(&buf);
6754 remove_tempfile();
6755 return NULL;
6756 }
6757 remove_tempfile();
6758
6759 return strbuf_detach(&buf, outsize);
6760 }
6761
6762 size_t fill_textconv(struct repository *r,
6763 struct userdiff_driver *driver,
6764 struct diff_filespec *df,
6765 char **outbuf)
6766 {
6767 size_t size;
6768
6769 if (!driver) {
6770 if (!DIFF_FILE_VALID(df)) {
6771 *outbuf = "";
6772 return 0;
6773 }
6774 if (diff_populate_filespec(r, df, 0))
6775 die("unable to read files to diff");
6776 *outbuf = df->data;
6777 return df->size;
6778 }
6779
6780 if (!driver->textconv)
6781 BUG("fill_textconv called with non-textconv driver");
6782
6783 if (driver->textconv_cache && df->oid_valid) {
6784 *outbuf = notes_cache_get(driver->textconv_cache,
6785 &df->oid,
6786 &size);
6787 if (*outbuf)
6788 return size;
6789 }
6790
6791 *outbuf = run_textconv(r, driver->textconv, df, &size);
6792 if (!*outbuf)
6793 die("unable to read files to diff");
6794
6795 if (driver->textconv_cache && df->oid_valid) {
6796 /* ignore errors, as we might be in a readonly repository */
6797 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6798 size);
6799 /*
6800 * we could save up changes and flush them all at the end,
6801 * but we would need an extra call after all diffing is done.
6802 * Since generating a cache entry is the slow path anyway,
6803 * this extra overhead probably isn't a big deal.
6804 */
6805 notes_cache_write(driver->textconv_cache);
6806 }
6807
6808 return size;
6809 }
6810
6811 int textconv_object(struct repository *r,
6812 const char *path,
6813 unsigned mode,
6814 const struct object_id *oid,
6815 int oid_valid,
6816 char **buf,
6817 unsigned long *buf_size)
6818 {
6819 struct diff_filespec *df;
6820 struct userdiff_driver *textconv;
6821
6822 df = alloc_filespec(path);
6823 fill_filespec(df, oid, oid_valid, mode);
6824 textconv = get_textconv(r, df);
6825 if (!textconv) {
6826 free_filespec(df);
6827 return 0;
6828 }
6829
6830 *buf_size = fill_textconv(r, textconv, df, buf);
6831 free_filespec(df);
6832 return 1;
6833 }
6834
6835 void setup_diff_pager(struct diff_options *opt)
6836 {
6837 /*
6838 * If the user asked for our exit code, then either they want --quiet
6839 * or --exit-code. We should definitely not bother with a pager in the
6840 * former case, as we will generate no output. Since we still properly
6841 * report our exit code even when a pager is run, we _could_ run a
6842 * pager with --exit-code. But since we have not done so historically,
6843 * and because it is easy to find people oneline advising "git diff
6844 * --exit-code" in hooks and other scripts, we do not do so.
6845 */
6846 if (!opt->flags.exit_with_status &&
6847 check_pager_config("diff") != 0)
6848 setup_pager();
6849 }
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