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diff-parseopt: convert -M|--find-renames
[git.git] / diff.c
blob2c904e0526d52437677b6d965b02d400c94c8062
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
29 #ifdef NO_FAST_WORKING_DIRECTORY
30 #define FAST_WORKING_DIRECTORY 0
31 #else
32 #define FAST_WORKING_DIRECTORY 1
33 #endif
34
35 static int diff_detect_rename_default;
36 static int diff_indent_heuristic = 1;
37 static int diff_rename_limit_default = 400;
38 static int diff_suppress_blank_empty;
39 static int diff_use_color_default = -1;
40 static int diff_color_moved_default;
41 static int diff_color_moved_ws_default;
42 static int diff_context_default = 3;
43 static int diff_interhunk_context_default;
44 static const char *diff_word_regex_cfg;
45 static const char *external_diff_cmd_cfg;
46 static const char *diff_order_file_cfg;
47 int diff_auto_refresh_index = 1;
48 static int diff_mnemonic_prefix;
49 static int diff_no_prefix;
50 static int diff_stat_graph_width;
51 static int diff_dirstat_permille_default = 30;
52 static struct diff_options default_diff_options;
53 static long diff_algorithm;
54 static unsigned ws_error_highlight_default = WSEH_NEW;
55
56 static char diff_colors[][COLOR_MAXLEN] = {
57 GIT_COLOR_RESET,
58 GIT_COLOR_NORMAL, /* CONTEXT */
59 GIT_COLOR_BOLD, /* METAINFO */
60 GIT_COLOR_CYAN, /* FRAGINFO */
61 GIT_COLOR_RED, /* OLD */
62 GIT_COLOR_GREEN, /* NEW */
63 GIT_COLOR_YELLOW, /* COMMIT */
64 GIT_COLOR_BG_RED, /* WHITESPACE */
65 GIT_COLOR_NORMAL, /* FUNCINFO */
66 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
67 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
68 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
69 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
70 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
71 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
72 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
73 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
74 GIT_COLOR_FAINT, /* CONTEXT_DIM */
75 GIT_COLOR_FAINT_RED, /* OLD_DIM */
76 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
77 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
78 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
79 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
80 };
81
82 static const char *color_diff_slots[] = {
83 [DIFF_CONTEXT] = "context",
84 [DIFF_METAINFO] = "meta",
85 [DIFF_FRAGINFO] = "frag",
86 [DIFF_FILE_OLD] = "old",
87 [DIFF_FILE_NEW] = "new",
88 [DIFF_COMMIT] = "commit",
89 [DIFF_WHITESPACE] = "whitespace",
90 [DIFF_FUNCINFO] = "func",
91 [DIFF_FILE_OLD_MOVED] = "oldMoved",
92 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
93 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
94 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
95 [DIFF_FILE_NEW_MOVED] = "newMoved",
96 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
97 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
98 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
99 [DIFF_CONTEXT_DIM] = "contextDimmed",
100 [DIFF_FILE_OLD_DIM] = "oldDimmed",
101 [DIFF_FILE_NEW_DIM] = "newDimmed",
102 [DIFF_CONTEXT_BOLD] = "contextBold",
103 [DIFF_FILE_OLD_BOLD] = "oldBold",
104 [DIFF_FILE_NEW_BOLD] = "newBold",
105 };
106
107 define_list_config_array_extra(color_diff_slots, {"plain"});
108
109 static int parse_diff_color_slot(const char *var)
110 {
111 if (!strcasecmp(var, "plain"))
112 return DIFF_CONTEXT;
113 return LOOKUP_CONFIG(color_diff_slots, var);
114 }
115
116 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
117 struct strbuf *errmsg)
118 {
119 char *params_copy = xstrdup(params_string);
120 struct string_list params = STRING_LIST_INIT_NODUP;
121 int ret = 0;
122 int i;
123
124 if (*params_copy)
125 string_list_split_in_place(&params, params_copy, ',', -1);
126 for (i = 0; i < params.nr; i++) {
127 const char *p = params.items[i].string;
128 if (!strcmp(p, "changes")) {
129 options->flags.dirstat_by_line = 0;
130 options->flags.dirstat_by_file = 0;
131 } else if (!strcmp(p, "lines")) {
132 options->flags.dirstat_by_line = 1;
133 options->flags.dirstat_by_file = 0;
134 } else if (!strcmp(p, "files")) {
135 options->flags.dirstat_by_line = 0;
136 options->flags.dirstat_by_file = 1;
137 } else if (!strcmp(p, "noncumulative")) {
138 options->flags.dirstat_cumulative = 0;
139 } else if (!strcmp(p, "cumulative")) {
140 options->flags.dirstat_cumulative = 1;
141 } else if (isdigit(*p)) {
142 char *end;
143 int permille = strtoul(p, &end, 10) * 10;
144 if (*end == '.' && isdigit(*++end)) {
145 /* only use first digit */
146 permille += *end - '0';
147 /* .. and ignore any further digits */
148 while (isdigit(*++end))
149 ; /* nothing */
150 }
151 if (!*end)
152 options->dirstat_permille = permille;
153 else {
154 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
155 p);
156 ret++;
157 }
158 } else {
159 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
160 ret++;
161 }
162
163 }
164 string_list_clear(&params, 0);
165 free(params_copy);
166 return ret;
167 }
168
169 static int parse_submodule_params(struct diff_options *options, const char *value)
170 {
171 if (!strcmp(value, "log"))
172 options->submodule_format = DIFF_SUBMODULE_LOG;
173 else if (!strcmp(value, "short"))
174 options->submodule_format = DIFF_SUBMODULE_SHORT;
175 else if (!strcmp(value, "diff"))
176 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
177 else
178 return -1;
179 return 0;
180 }
181
182 int git_config_rename(const char *var, const char *value)
183 {
184 if (!value)
185 return DIFF_DETECT_RENAME;
186 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
187 return DIFF_DETECT_COPY;
188 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
189 }
190
191 long parse_algorithm_value(const char *value)
192 {
193 if (!value)
194 return -1;
195 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
196 return 0;
197 else if (!strcasecmp(value, "minimal"))
198 return XDF_NEED_MINIMAL;
199 else if (!strcasecmp(value, "patience"))
200 return XDF_PATIENCE_DIFF;
201 else if (!strcasecmp(value, "histogram"))
202 return XDF_HISTOGRAM_DIFF;
203 return -1;
204 }
205
206 static int parse_one_token(const char **arg, const char *token)
207 {
208 const char *rest;
209 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
210 *arg = rest;
211 return 1;
212 }
213 return 0;
214 }
215
216 static int parse_ws_error_highlight(const char *arg)
217 {
218 const char *orig_arg = arg;
219 unsigned val = 0;
220
221 while (*arg) {
222 if (parse_one_token(&arg, "none"))
223 val = 0;
224 else if (parse_one_token(&arg, "default"))
225 val = WSEH_NEW;
226 else if (parse_one_token(&arg, "all"))
227 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
228 else if (parse_one_token(&arg, "new"))
229 val |= WSEH_NEW;
230 else if (parse_one_token(&arg, "old"))
231 val |= WSEH_OLD;
232 else if (parse_one_token(&arg, "context"))
233 val |= WSEH_CONTEXT;
234 else {
235 return -1 - (int)(arg - orig_arg);
236 }
237 if (*arg)
238 arg++;
239 }
240 return val;
241 }
242
243 /*
244 * These are to give UI layer defaults.
245 * The core-level commands such as git-diff-files should
246 * never be affected by the setting of diff.renames
247 * the user happens to have in the configuration file.
248 */
249 void init_diff_ui_defaults(void)
250 {
251 diff_detect_rename_default = DIFF_DETECT_RENAME;
252 }
253
254 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
255 {
256 if (!strcmp(var, "diff.indentheuristic"))
257 diff_indent_heuristic = git_config_bool(var, value);
258 return 0;
259 }
260
261 static int parse_color_moved(const char *arg)
262 {
263 switch (git_parse_maybe_bool(arg)) {
264 case 0:
265 return COLOR_MOVED_NO;
266 case 1:
267 return COLOR_MOVED_DEFAULT;
268 default:
269 break;
270 }
271
272 if (!strcmp(arg, "no"))
273 return COLOR_MOVED_NO;
274 else if (!strcmp(arg, "plain"))
275 return COLOR_MOVED_PLAIN;
276 else if (!strcmp(arg, "blocks"))
277 return COLOR_MOVED_BLOCKS;
278 else if (!strcmp(arg, "zebra"))
279 return COLOR_MOVED_ZEBRA;
280 else if (!strcmp(arg, "default"))
281 return COLOR_MOVED_DEFAULT;
282 else if (!strcmp(arg, "dimmed-zebra"))
283 return COLOR_MOVED_ZEBRA_DIM;
284 else if (!strcmp(arg, "dimmed_zebra"))
285 return COLOR_MOVED_ZEBRA_DIM;
286 else
287 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
288 }
289
290 static unsigned parse_color_moved_ws(const char *arg)
291 {
292 int ret = 0;
293 struct string_list l = STRING_LIST_INIT_DUP;
294 struct string_list_item *i;
295
296 string_list_split(&l, arg, ',', -1);
297
298 for_each_string_list_item(i, &l) {
299 struct strbuf sb = STRBUF_INIT;
300 strbuf_addstr(&sb, i->string);
301 strbuf_trim(&sb);
302
303 if (!strcmp(sb.buf, "ignore-space-change"))
304 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
305 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
306 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
307 else if (!strcmp(sb.buf, "ignore-all-space"))
308 ret |= XDF_IGNORE_WHITESPACE;
309 else if (!strcmp(sb.buf, "allow-indentation-change"))
310 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
311 else {
312 ret |= COLOR_MOVED_WS_ERROR;
313 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);
314 }
315
316 strbuf_release(&sb);
317 }
318
319 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
320 (ret & XDF_WHITESPACE_FLAGS)) {
321 error(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
322 ret |= COLOR_MOVED_WS_ERROR;
323 }
324
325 string_list_clear(&l, 0);
326
327 return ret;
328 }
329
330 int git_diff_ui_config(const char *var, const char *value, void *cb)
331 {
332 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
333 diff_use_color_default = git_config_colorbool(var, value);
334 return 0;
335 }
336 if (!strcmp(var, "diff.colormoved")) {
337 int cm = parse_color_moved(value);
338 if (cm < 0)
339 return -1;
340 diff_color_moved_default = cm;
341 return 0;
342 }
343 if (!strcmp(var, "diff.colormovedws")) {
344 unsigned cm = parse_color_moved_ws(value);
345 if (cm & COLOR_MOVED_WS_ERROR)
346 return -1;
347 diff_color_moved_ws_default = cm;
348 return 0;
349 }
350 if (!strcmp(var, "diff.context")) {
351 diff_context_default = git_config_int(var, value);
352 if (diff_context_default < 0)
353 return -1;
354 return 0;
355 }
356 if (!strcmp(var, "diff.interhunkcontext")) {
357 diff_interhunk_context_default = git_config_int(var, value);
358 if (diff_interhunk_context_default < 0)
359 return -1;
360 return 0;
361 }
362 if (!strcmp(var, "diff.renames")) {
363 diff_detect_rename_default = git_config_rename(var, value);
364 return 0;
365 }
366 if (!strcmp(var, "diff.autorefreshindex")) {
367 diff_auto_refresh_index = git_config_bool(var, value);
368 return 0;
369 }
370 if (!strcmp(var, "diff.mnemonicprefix")) {
371 diff_mnemonic_prefix = git_config_bool(var, value);
372 return 0;
373 }
374 if (!strcmp(var, "diff.noprefix")) {
375 diff_no_prefix = git_config_bool(var, value);
376 return 0;
377 }
378 if (!strcmp(var, "diff.statgraphwidth")) {
379 diff_stat_graph_width = git_config_int(var, value);
380 return 0;
381 }
382 if (!strcmp(var, "diff.external"))
383 return git_config_string(&external_diff_cmd_cfg, var, value);
384 if (!strcmp(var, "diff.wordregex"))
385 return git_config_string(&diff_word_regex_cfg, var, value);
386 if (!strcmp(var, "diff.orderfile"))
387 return git_config_pathname(&diff_order_file_cfg, var, value);
388
389 if (!strcmp(var, "diff.ignoresubmodules"))
390 handle_ignore_submodules_arg(&default_diff_options, value);
391
392 if (!strcmp(var, "diff.submodule")) {
393 if (parse_submodule_params(&default_diff_options, value))
394 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
395 value);
396 return 0;
397 }
398
399 if (!strcmp(var, "diff.algorithm")) {
400 diff_algorithm = parse_algorithm_value(value);
401 if (diff_algorithm < 0)
402 return -1;
403 return 0;
404 }
405
406 if (!strcmp(var, "diff.wserrorhighlight")) {
407 int val = parse_ws_error_highlight(value);
408 if (val < 0)
409 return -1;
410 ws_error_highlight_default = val;
411 return 0;
412 }
413
414 if (git_color_config(var, value, cb) < 0)
415 return -1;
416
417 return git_diff_basic_config(var, value, cb);
418 }
419
420 int git_diff_basic_config(const char *var, const char *value, void *cb)
421 {
422 const char *name;
423
424 if (!strcmp(var, "diff.renamelimit")) {
425 diff_rename_limit_default = git_config_int(var, value);
426 return 0;
427 }
428
429 if (userdiff_config(var, value) < 0)
430 return -1;
431
432 if (skip_prefix(var, "diff.color.", &name) ||
433 skip_prefix(var, "color.diff.", &name)) {
434 int slot = parse_diff_color_slot(name);
435 if (slot < 0)
436 return 0;
437 if (!value)
438 return config_error_nonbool(var);
439 return color_parse(value, diff_colors[slot]);
440 }
441
442 /* like GNU diff's --suppress-blank-empty option */
443 if (!strcmp(var, "diff.suppressblankempty") ||
444 /* for backwards compatibility */
445 !strcmp(var, "diff.suppress-blank-empty")) {
446 diff_suppress_blank_empty = git_config_bool(var, value);
447 return 0;
448 }
449
450 if (!strcmp(var, "diff.dirstat")) {
451 struct strbuf errmsg = STRBUF_INIT;
452 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
453 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
454 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
455 errmsg.buf);
456 strbuf_release(&errmsg);
457 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
458 return 0;
459 }
460
461 if (git_diff_heuristic_config(var, value, cb) < 0)
462 return -1;
463
464 return git_default_config(var, value, cb);
465 }
466
467 static char *quote_two(const char *one, const char *two)
468 {
469 int need_one = quote_c_style(one, NULL, NULL, 1);
470 int need_two = quote_c_style(two, NULL, NULL, 1);
471 struct strbuf res = STRBUF_INIT;
472
473 if (need_one + need_two) {
474 strbuf_addch(&res, '"');
475 quote_c_style(one, &res, NULL, 1);
476 quote_c_style(two, &res, NULL, 1);
477 strbuf_addch(&res, '"');
478 } else {
479 strbuf_addstr(&res, one);
480 strbuf_addstr(&res, two);
481 }
482 return strbuf_detach(&res, NULL);
483 }
484
485 static const char *external_diff(void)
486 {
487 static const char *external_diff_cmd = NULL;
488 static int done_preparing = 0;
489
490 if (done_preparing)
491 return external_diff_cmd;
492 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
493 if (!external_diff_cmd)
494 external_diff_cmd = external_diff_cmd_cfg;
495 done_preparing = 1;
496 return external_diff_cmd;
497 }
498
499 /*
500 * Keep track of files used for diffing. Sometimes such an entry
501 * refers to a temporary file, sometimes to an existing file, and
502 * sometimes to "/dev/null".
503 */
504 static struct diff_tempfile {
505 /*
506 * filename external diff should read from, or NULL if this
507 * entry is currently not in use:
508 */
509 const char *name;
510
511 char hex[GIT_MAX_HEXSZ + 1];
512 char mode[10];
513
514 /*
515 * If this diff_tempfile instance refers to a temporary file,
516 * this tempfile object is used to manage its lifetime.
517 */
518 struct tempfile *tempfile;
519 } diff_temp[2];
520
521 struct emit_callback {
522 int color_diff;
523 unsigned ws_rule;
524 int blank_at_eof_in_preimage;
525 int blank_at_eof_in_postimage;
526 int lno_in_preimage;
527 int lno_in_postimage;
528 const char **label_path;
529 struct diff_words_data *diff_words;
530 struct diff_options *opt;
531 struct strbuf *header;
532 };
533
534 static int count_lines(const char *data, int size)
535 {
536 int count, ch, completely_empty = 1, nl_just_seen = 0;
537 count = 0;
538 while (0 < size--) {
539 ch = *data++;
540 if (ch == '\n') {
541 count++;
542 nl_just_seen = 1;
543 completely_empty = 0;
544 }
545 else {
546 nl_just_seen = 0;
547 completely_empty = 0;
548 }
549 }
550 if (completely_empty)
551 return 0;
552 if (!nl_just_seen)
553 count++; /* no trailing newline */
554 return count;
555 }
556
557 static int fill_mmfile(struct repository *r, mmfile_t *mf,
558 struct diff_filespec *one)
559 {
560 if (!DIFF_FILE_VALID(one)) {
561 mf->ptr = (char *)""; /* does not matter */
562 mf->size = 0;
563 return 0;
564 }
565 else if (diff_populate_filespec(r, one, 0))
566 return -1;
567
568 mf->ptr = one->data;
569 mf->size = one->size;
570 return 0;
571 }
572
573 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
574 static unsigned long diff_filespec_size(struct repository *r,
575 struct diff_filespec *one)
576 {
577 if (!DIFF_FILE_VALID(one))
578 return 0;
579 diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
580 return one->size;
581 }
582
583 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
584 {
585 char *ptr = mf->ptr;
586 long size = mf->size;
587 int cnt = 0;
588
589 if (!size)
590 return cnt;
591 ptr += size - 1; /* pointing at the very end */
592 if (*ptr != '\n')
593 ; /* incomplete line */
594 else
595 ptr--; /* skip the last LF */
596 while (mf->ptr < ptr) {
597 char *prev_eol;
598 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
599 if (*prev_eol == '\n')
600 break;
601 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
602 break;
603 cnt++;
604 ptr = prev_eol - 1;
605 }
606 return cnt;
607 }
608
609 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
610 struct emit_callback *ecbdata)
611 {
612 int l1, l2, at;
613 unsigned ws_rule = ecbdata->ws_rule;
614 l1 = count_trailing_blank(mf1, ws_rule);
615 l2 = count_trailing_blank(mf2, ws_rule);
616 if (l2 <= l1) {
617 ecbdata->blank_at_eof_in_preimage = 0;
618 ecbdata->blank_at_eof_in_postimage = 0;
619 return;
620 }
621 at = count_lines(mf1->ptr, mf1->size);
622 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
623
624 at = count_lines(mf2->ptr, mf2->size);
625 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
626 }
627
628 static void emit_line_0(struct diff_options *o,
629 const char *set_sign, const char *set, unsigned reverse, const char *reset,
630 int first, const char *line, int len)
631 {
632 int has_trailing_newline, has_trailing_carriage_return;
633 int needs_reset = 0; /* at the end of the line */
634 FILE *file = o->file;
635
636 fputs(diff_line_prefix(o), file);
637
638 has_trailing_newline = (len > 0 && line[len-1] == '\n');
639 if (has_trailing_newline)
640 len--;
641
642 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
643 if (has_trailing_carriage_return)
644 len--;
645
646 if (!len && !first)
647 goto end_of_line;
648
649 if (reverse && want_color(o->use_color)) {
650 fputs(GIT_COLOR_REVERSE, file);
651 needs_reset = 1;
652 }
653
654 if (set_sign) {
655 fputs(set_sign, file);
656 needs_reset = 1;
657 }
658
659 if (first)
660 fputc(first, file);
661
662 if (!len)
663 goto end_of_line;
664
665 if (set) {
666 if (set_sign && set != set_sign)
667 fputs(reset, file);
668 fputs(set, file);
669 needs_reset = 1;
670 }
671 fwrite(line, len, 1, file);
672 needs_reset = 1; /* 'line' may contain color codes. */
673
674 end_of_line:
675 if (needs_reset)
676 fputs(reset, file);
677 if (has_trailing_carriage_return)
678 fputc('\r', file);
679 if (has_trailing_newline)
680 fputc('\n', file);
681 }
682
683 static void emit_line(struct diff_options *o, const char *set, const char *reset,
684 const char *line, int len)
685 {
686 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
687 }
688
689 enum diff_symbol {
690 DIFF_SYMBOL_BINARY_DIFF_HEADER,
691 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
692 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
693 DIFF_SYMBOL_BINARY_DIFF_BODY,
694 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
695 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
696 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
697 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
698 DIFF_SYMBOL_STATS_LINE,
699 DIFF_SYMBOL_WORD_DIFF,
700 DIFF_SYMBOL_STAT_SEP,
701 DIFF_SYMBOL_SUMMARY,
702 DIFF_SYMBOL_SUBMODULE_ADD,
703 DIFF_SYMBOL_SUBMODULE_DEL,
704 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
705 DIFF_SYMBOL_SUBMODULE_MODIFIED,
706 DIFF_SYMBOL_SUBMODULE_HEADER,
707 DIFF_SYMBOL_SUBMODULE_ERROR,
708 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
709 DIFF_SYMBOL_REWRITE_DIFF,
710 DIFF_SYMBOL_BINARY_FILES,
711 DIFF_SYMBOL_HEADER,
712 DIFF_SYMBOL_FILEPAIR_PLUS,
713 DIFF_SYMBOL_FILEPAIR_MINUS,
714 DIFF_SYMBOL_WORDS_PORCELAIN,
715 DIFF_SYMBOL_WORDS,
716 DIFF_SYMBOL_CONTEXT,
717 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
718 DIFF_SYMBOL_PLUS,
719 DIFF_SYMBOL_MINUS,
720 DIFF_SYMBOL_NO_LF_EOF,
721 DIFF_SYMBOL_CONTEXT_FRAGINFO,
722 DIFF_SYMBOL_CONTEXT_MARKER,
723 DIFF_SYMBOL_SEPARATOR
724 };
725 /*
726 * Flags for content lines:
727 * 0..12 are whitespace rules
728 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
729 * 16 is marking if the line is blank at EOF
730 */
731 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
732 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
733 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
734 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
735 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
736
737 /*
738 * This struct is used when we need to buffer the output of the diff output.
739 *
740 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
741 * into the pre/post image file. This pointer could be a union with the
742 * line pointer. By storing an offset into the file instead of the literal line,
743 * we can decrease the memory footprint for the buffered output. At first we
744 * may want to only have indirection for the content lines, but we could also
745 * enhance the state for emitting prefabricated lines, e.g. the similarity
746 * score line or hunk/file headers would only need to store a number or path
747 * and then the output can be constructed later on depending on state.
748 */
749 struct emitted_diff_symbol {
750 const char *line;
751 int len;
752 int flags;
753 enum diff_symbol s;
754 };
755 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
756
757 struct emitted_diff_symbols {
758 struct emitted_diff_symbol *buf;
759 int nr, alloc;
760 };
761 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
762
763 static void append_emitted_diff_symbol(struct diff_options *o,
764 struct emitted_diff_symbol *e)
765 {
766 struct emitted_diff_symbol *f;
767
768 ALLOC_GROW(o->emitted_symbols->buf,
769 o->emitted_symbols->nr + 1,
770 o->emitted_symbols->alloc);
771 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
772
773 memcpy(f, e, sizeof(struct emitted_diff_symbol));
774 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
775 }
776
777 struct moved_entry {
778 struct hashmap_entry ent;
779 const struct emitted_diff_symbol *es;
780 struct moved_entry *next_line;
781 };
782
783 /**
784 * The struct ws_delta holds white space differences between moved lines, i.e.
785 * between '+' and '-' lines that have been detected to be a move.
786 * The string contains the difference in leading white spaces, before the
787 * rest of the line is compared using the white space config for move
788 * coloring. The current_longer indicates if the first string in the
789 * comparision is longer than the second.
790 */
791 struct ws_delta {
792 char *string;
793 unsigned int current_longer : 1;
794 };
795 #define WS_DELTA_INIT { NULL, 0 }
796
797 struct moved_block {
798 struct moved_entry *match;
799 struct ws_delta wsd;
800 };
801
802 static void moved_block_clear(struct moved_block *b)
803 {
804 FREE_AND_NULL(b->wsd.string);
805 b->match = NULL;
806 }
807
808 static int compute_ws_delta(const struct emitted_diff_symbol *a,
809 const struct emitted_diff_symbol *b,
810 struct ws_delta *out)
811 {
812 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
813 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
814 int d = longer->len - shorter->len;
815
816 if (strncmp(longer->line + d, shorter->line, shorter->len))
817 return 0;
818
819 out->string = xmemdupz(longer->line, d);
820 out->current_longer = (a == longer);
821
822 return 1;
823 }
824
825 static int cmp_in_block_with_wsd(const struct diff_options *o,
826 const struct moved_entry *cur,
827 const struct moved_entry *match,
828 struct moved_block *pmb,
829 int n)
830 {
831 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
832 int al = cur->es->len, cl = l->len;
833 const char *a = cur->es->line,
834 *b = match->es->line,
835 *c = l->line;
836
837 int wslen;
838
839 /*
840 * We need to check if 'cur' is equal to 'match'.
841 * As those are from the same (+/-) side, we do not need to adjust for
842 * indent changes. However these were found using fuzzy matching
843 * so we do have to check if they are equal.
844 */
845 if (strcmp(a, b))
846 return 1;
847
848 if (!pmb->wsd.string)
849 /*
850 * The white space delta is not active? This can happen
851 * when we exit early in this function.
852 */
853 return 1;
854
855 /*
856 * The indent changes of the block are known and stored in
857 * pmb->wsd; however we need to check if the indent changes of the
858 * current line are still the same as before.
859 *
860 * To do so we need to compare 'l' to 'cur', adjusting the
861 * one of them for the white spaces, depending which was longer.
862 */
863
864 wslen = strlen(pmb->wsd.string);
865 if (pmb->wsd.current_longer) {
866 c += wslen;
867 cl -= wslen;
868 } else {
869 a += wslen;
870 al -= wslen;
871 }
872
873 if (al != cl || memcmp(a, c, al))
874 return 1;
875
876 return 0;
877 }
878
879 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
880 const void *entry,
881 const void *entry_or_key,
882 const void *keydata)
883 {
884 const struct diff_options *diffopt = hashmap_cmp_fn_data;
885 const struct moved_entry *a = entry;
886 const struct moved_entry *b = entry_or_key;
887 unsigned flags = diffopt->color_moved_ws_handling
888 & XDF_WHITESPACE_FLAGS;
889
890 if (diffopt->color_moved_ws_handling &
891 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
892 /*
893 * As there is not specific white space config given,
894 * we'd need to check for a new block, so ignore all
895 * white space. The setup of the white space
896 * configuration for the next block is done else where
897 */
898 flags |= XDF_IGNORE_WHITESPACE;
899
900 return !xdiff_compare_lines(a->es->line, a->es->len,
901 b->es->line, b->es->len,
902 flags);
903 }
904
905 static struct moved_entry *prepare_entry(struct diff_options *o,
906 int line_no)
907 {
908 struct moved_entry *ret = xmalloc(sizeof(*ret));
909 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
910 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
911
912 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
913 ret->es = l;
914 ret->next_line = NULL;
915
916 return ret;
917 }
918
919 static void add_lines_to_move_detection(struct diff_options *o,
920 struct hashmap *add_lines,
921 struct hashmap *del_lines)
922 {
923 struct moved_entry *prev_line = NULL;
924
925 int n;
926 for (n = 0; n < o->emitted_symbols->nr; n++) {
927 struct hashmap *hm;
928 struct moved_entry *key;
929
930 switch (o->emitted_symbols->buf[n].s) {
931 case DIFF_SYMBOL_PLUS:
932 hm = add_lines;
933 break;
934 case DIFF_SYMBOL_MINUS:
935 hm = del_lines;
936 break;
937 default:
938 prev_line = NULL;
939 continue;
940 }
941
942 key = prepare_entry(o, n);
943 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
944 prev_line->next_line = key;
945
946 hashmap_add(hm, key);
947 prev_line = key;
948 }
949 }
950
951 static void pmb_advance_or_null(struct diff_options *o,
952 struct moved_entry *match,
953 struct hashmap *hm,
954 struct moved_block *pmb,
955 int pmb_nr)
956 {
957 int i;
958 for (i = 0; i < pmb_nr; i++) {
959 struct moved_entry *prev = pmb[i].match;
960 struct moved_entry *cur = (prev && prev->next_line) ?
961 prev->next_line : NULL;
962 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
963 pmb[i].match = cur;
964 } else {
965 pmb[i].match = NULL;
966 }
967 }
968 }
969
970 static void pmb_advance_or_null_multi_match(struct diff_options *o,
971 struct moved_entry *match,
972 struct hashmap *hm,
973 struct moved_block *pmb,
974 int pmb_nr, int n)
975 {
976 int i;
977 char *got_match = xcalloc(1, pmb_nr);
978
979 for (; match; match = hashmap_get_next(hm, match)) {
980 for (i = 0; i < pmb_nr; i++) {
981 struct moved_entry *prev = pmb[i].match;
982 struct moved_entry *cur = (prev && prev->next_line) ?
983 prev->next_line : NULL;
984 if (!cur)
985 continue;
986 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
987 got_match[i] |= 1;
988 }
989 }
990
991 for (i = 0; i < pmb_nr; i++) {
992 if (got_match[i]) {
993 /* Advance to the next line */
994 pmb[i].match = pmb[i].match->next_line;
995 } else {
996 moved_block_clear(&pmb[i]);
997 }
998 }
999
1000 free(got_match);
1001 }
1002
1003 static int shrink_potential_moved_blocks(struct moved_block *pmb,
1004 int pmb_nr)
1005 {
1006 int lp, rp;
1007
1008 /* Shrink the set of potential block to the remaining running */
1009 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
1010 while (lp < pmb_nr && pmb[lp].match)
1011 lp++;
1012 /* lp points at the first NULL now */
1013
1014 while (rp > -1 && !pmb[rp].match)
1015 rp--;
1016 /* rp points at the last non-NULL */
1017
1018 if (lp < pmb_nr && rp > -1 && lp < rp) {
1019 pmb[lp] = pmb[rp];
1020 pmb[rp].match = NULL;
1021 pmb[rp].wsd.string = NULL;
1022 rp--;
1023 lp++;
1024 }
1025 }
1026
1027 /* Remember the number of running sets */
1028 return rp + 1;
1029 }
1030
1031 /*
1032 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1033 *
1034 * Otherwise, if the last block has fewer alphanumeric characters than
1035 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1036 * that block.
1037 *
1038 * The last block consists of the (n - block_length)'th line up to but not
1039 * including the nth line.
1040 *
1041 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1042 * Think of a way to unify them.
1043 */
1044 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1045 {
1046 int i, alnum_count = 0;
1047 if (o->color_moved == COLOR_MOVED_PLAIN)
1048 return;
1049 for (i = 1; i < block_length + 1; i++) {
1050 const char *c = o->emitted_symbols->buf[n - i].line;
1051 for (; *c; c++) {
1052 if (!isalnum(*c))
1053 continue;
1054 alnum_count++;
1055 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1056 return;
1057 }
1058 }
1059 for (i = 1; i < block_length + 1; i++)
1060 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1061 }
1062
1063 /* Find blocks of moved code, delegate actual coloring decision to helper */
1064 static void mark_color_as_moved(struct diff_options *o,
1065 struct hashmap *add_lines,
1066 struct hashmap *del_lines)
1067 {
1068 struct moved_block *pmb = NULL; /* potentially moved blocks */
1069 int pmb_nr = 0, pmb_alloc = 0;
1070 int n, flipped_block = 1, block_length = 0;
1071
1072
1073 for (n = 0; n < o->emitted_symbols->nr; n++) {
1074 struct hashmap *hm = NULL;
1075 struct moved_entry *key;
1076 struct moved_entry *match = NULL;
1077 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1078
1079 switch (l->s) {
1080 case DIFF_SYMBOL_PLUS:
1081 hm = del_lines;
1082 key = prepare_entry(o, n);
1083 match = hashmap_get(hm, key, NULL);
1084 free(key);
1085 break;
1086 case DIFF_SYMBOL_MINUS:
1087 hm = add_lines;
1088 key = prepare_entry(o, n);
1089 match = hashmap_get(hm, key, NULL);
1090 free(key);
1091 break;
1092 default:
1093 flipped_block = 1;
1094 }
1095
1096 if (!match) {
1097 int i;
1098
1099 adjust_last_block(o, n, block_length);
1100 for(i = 0; i < pmb_nr; i++)
1101 moved_block_clear(&pmb[i]);
1102 pmb_nr = 0;
1103 block_length = 0;
1104 continue;
1105 }
1106
1107 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1108
1109 if (o->color_moved == COLOR_MOVED_PLAIN)
1110 continue;
1111
1112 if (o->color_moved_ws_handling &
1113 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1114 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1115 else
1116 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1117
1118 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1119
1120 if (pmb_nr == 0) {
1121 /*
1122 * The current line is the start of a new block.
1123 * Setup the set of potential blocks.
1124 */
1125 for (; match; match = hashmap_get_next(hm, match)) {
1126 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1127 if (o->color_moved_ws_handling &
1128 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1129 if (compute_ws_delta(l, match->es,
1130 &pmb[pmb_nr].wsd))
1131 pmb[pmb_nr++].match = match;
1132 } else {
1133 pmb[pmb_nr].wsd.string = NULL;
1134 pmb[pmb_nr++].match = match;
1135 }
1136 }
1137
1138 flipped_block = (flipped_block + 1) % 2;
1139
1140 adjust_last_block(o, n, block_length);
1141 block_length = 0;
1142 }
1143
1144 block_length++;
1145
1146 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1147 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1148 }
1149 adjust_last_block(o, n, block_length);
1150
1151 for(n = 0; n < pmb_nr; n++)
1152 moved_block_clear(&pmb[n]);
1153 free(pmb);
1154 }
1155
1156 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1157 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1158 static void dim_moved_lines(struct diff_options *o)
1159 {
1160 int n;
1161 for (n = 0; n < o->emitted_symbols->nr; n++) {
1162 struct emitted_diff_symbol *prev = (n != 0) ?
1163 &o->emitted_symbols->buf[n - 1] : NULL;
1164 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1165 struct emitted_diff_symbol *next =
1166 (n < o->emitted_symbols->nr - 1) ?
1167 &o->emitted_symbols->buf[n + 1] : NULL;
1168
1169 /* Not a plus or minus line? */
1170 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1171 continue;
1172
1173 /* Not a moved line? */
1174 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1175 continue;
1176
1177 /*
1178 * If prev or next are not a plus or minus line,
1179 * pretend they don't exist
1180 */
1181 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1182 prev->s != DIFF_SYMBOL_MINUS)
1183 prev = NULL;
1184 if (next && next->s != DIFF_SYMBOL_PLUS &&
1185 next->s != DIFF_SYMBOL_MINUS)
1186 next = NULL;
1187
1188 /* Inside a block? */
1189 if ((prev &&
1190 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1191 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1192 (next &&
1193 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1194 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1195 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1196 continue;
1197 }
1198
1199 /* Check if we are at an interesting bound: */
1200 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1201 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1202 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1203 continue;
1204 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1205 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1206 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1207 continue;
1208
1209 /*
1210 * The boundary to prev and next are not interesting,
1211 * so this line is not interesting as a whole
1212 */
1213 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1214 }
1215 }
1216
1217 static void emit_line_ws_markup(struct diff_options *o,
1218 const char *set_sign, const char *set,
1219 const char *reset,
1220 int sign_index, const char *line, int len,
1221 unsigned ws_rule, int blank_at_eof)
1222 {
1223 const char *ws = NULL;
1224 int sign = o->output_indicators[sign_index];
1225
1226 if (o->ws_error_highlight & ws_rule) {
1227 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1228 if (!*ws)
1229 ws = NULL;
1230 }
1231
1232 if (!ws && !set_sign)
1233 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1234 else if (!ws) {
1235 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1236 } else if (blank_at_eof)
1237 /* Blank line at EOF - paint '+' as well */
1238 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1239 else {
1240 /* Emit just the prefix, then the rest. */
1241 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1242 sign, "", 0);
1243 ws_check_emit(line, len, ws_rule,
1244 o->file, set, reset, ws);
1245 }
1246 }
1247
1248 static void emit_diff_symbol_from_struct(struct diff_options *o,
1249 struct emitted_diff_symbol *eds)
1250 {
1251 static const char *nneof = " No newline at end of file\n";
1252 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1253 struct strbuf sb = STRBUF_INIT;
1254
1255 enum diff_symbol s = eds->s;
1256 const char *line = eds->line;
1257 int len = eds->len;
1258 unsigned flags = eds->flags;
1259
1260 switch (s) {
1261 case DIFF_SYMBOL_NO_LF_EOF:
1262 context = diff_get_color_opt(o, DIFF_CONTEXT);
1263 reset = diff_get_color_opt(o, DIFF_RESET);
1264 putc('\n', o->file);
1265 emit_line_0(o, context, NULL, 0, reset, '\\',
1266 nneof, strlen(nneof));
1267 break;
1268 case DIFF_SYMBOL_SUBMODULE_HEADER:
1269 case DIFF_SYMBOL_SUBMODULE_ERROR:
1270 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1271 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1272 case DIFF_SYMBOL_SUMMARY:
1273 case DIFF_SYMBOL_STATS_LINE:
1274 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1275 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1276 emit_line(o, "", "", line, len);
1277 break;
1278 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1279 case DIFF_SYMBOL_CONTEXT_MARKER:
1280 context = diff_get_color_opt(o, DIFF_CONTEXT);
1281 reset = diff_get_color_opt(o, DIFF_RESET);
1282 emit_line(o, context, reset, line, len);
1283 break;
1284 case DIFF_SYMBOL_SEPARATOR:
1285 fprintf(o->file, "%s%c",
1286 diff_line_prefix(o),
1287 o->line_termination);
1288 break;
1289 case DIFF_SYMBOL_CONTEXT:
1290 set = diff_get_color_opt(o, DIFF_CONTEXT);
1291 reset = diff_get_color_opt(o, DIFF_RESET);
1292 set_sign = NULL;
1293 if (o->flags.dual_color_diffed_diffs) {
1294 char c = !len ? 0 : line[0];
1295
1296 if (c == '+')
1297 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1298 else if (c == '@')
1299 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1300 else if (c == '-')
1301 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1302 }
1303 emit_line_ws_markup(o, set_sign, set, reset,
1304 OUTPUT_INDICATOR_CONTEXT, line, len,
1305 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1306 break;
1307 case DIFF_SYMBOL_PLUS:
1308 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1309 DIFF_SYMBOL_MOVED_LINE_ALT |
1310 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1311 case DIFF_SYMBOL_MOVED_LINE |
1312 DIFF_SYMBOL_MOVED_LINE_ALT |
1313 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1314 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1315 break;
1316 case DIFF_SYMBOL_MOVED_LINE |
1317 DIFF_SYMBOL_MOVED_LINE_ALT:
1318 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1319 break;
1320 case DIFF_SYMBOL_MOVED_LINE |
1321 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1322 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1323 break;
1324 case DIFF_SYMBOL_MOVED_LINE:
1325 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1326 break;
1327 default:
1328 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1329 }
1330 reset = diff_get_color_opt(o, DIFF_RESET);
1331 if (!o->flags.dual_color_diffed_diffs)
1332 set_sign = NULL;
1333 else {
1334 char c = !len ? 0 : line[0];
1335
1336 set_sign = set;
1337 if (c == '-')
1338 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1339 else if (c == '@')
1340 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1341 else if (c == '+')
1342 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1343 else
1344 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1345 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1346 }
1347 emit_line_ws_markup(o, set_sign, set, reset,
1348 OUTPUT_INDICATOR_NEW, line, len,
1349 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1350 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1351 break;
1352 case DIFF_SYMBOL_MINUS:
1353 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1354 DIFF_SYMBOL_MOVED_LINE_ALT |
1355 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1356 case DIFF_SYMBOL_MOVED_LINE |
1357 DIFF_SYMBOL_MOVED_LINE_ALT |
1358 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1359 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1360 break;
1361 case DIFF_SYMBOL_MOVED_LINE |
1362 DIFF_SYMBOL_MOVED_LINE_ALT:
1363 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1364 break;
1365 case DIFF_SYMBOL_MOVED_LINE |
1366 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1367 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1368 break;
1369 case DIFF_SYMBOL_MOVED_LINE:
1370 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1371 break;
1372 default:
1373 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1374 }
1375 reset = diff_get_color_opt(o, DIFF_RESET);
1376 if (!o->flags.dual_color_diffed_diffs)
1377 set_sign = NULL;
1378 else {
1379 char c = !len ? 0 : line[0];
1380
1381 set_sign = set;
1382 if (c == '+')
1383 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1384 else if (c == '@')
1385 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1386 else if (c == '-')
1387 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1388 else
1389 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1390 }
1391 emit_line_ws_markup(o, set_sign, set, reset,
1392 OUTPUT_INDICATOR_OLD, line, len,
1393 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1394 break;
1395 case DIFF_SYMBOL_WORDS_PORCELAIN:
1396 context = diff_get_color_opt(o, DIFF_CONTEXT);
1397 reset = diff_get_color_opt(o, DIFF_RESET);
1398 emit_line(o, context, reset, line, len);
1399 fputs("~\n", o->file);
1400 break;
1401 case DIFF_SYMBOL_WORDS:
1402 context = diff_get_color_opt(o, DIFF_CONTEXT);
1403 reset = diff_get_color_opt(o, DIFF_RESET);
1404 /*
1405 * Skip the prefix character, if any. With
1406 * diff_suppress_blank_empty, there may be
1407 * none.
1408 */
1409 if (line[0] != '\n') {
1410 line++;
1411 len--;
1412 }
1413 emit_line(o, context, reset, line, len);
1414 break;
1415 case DIFF_SYMBOL_FILEPAIR_PLUS:
1416 meta = diff_get_color_opt(o, DIFF_METAINFO);
1417 reset = diff_get_color_opt(o, DIFF_RESET);
1418 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1419 line, reset,
1420 strchr(line, ' ') ? "\t" : "");
1421 break;
1422 case DIFF_SYMBOL_FILEPAIR_MINUS:
1423 meta = diff_get_color_opt(o, DIFF_METAINFO);
1424 reset = diff_get_color_opt(o, DIFF_RESET);
1425 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1426 line, reset,
1427 strchr(line, ' ') ? "\t" : "");
1428 break;
1429 case DIFF_SYMBOL_BINARY_FILES:
1430 case DIFF_SYMBOL_HEADER:
1431 fprintf(o->file, "%s", line);
1432 break;
1433 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1434 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1435 break;
1436 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1437 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1438 break;
1439 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1440 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1441 break;
1442 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1443 fputs(diff_line_prefix(o), o->file);
1444 fputc('\n', o->file);
1445 break;
1446 case DIFF_SYMBOL_REWRITE_DIFF:
1447 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1448 reset = diff_get_color_opt(o, DIFF_RESET);
1449 emit_line(o, fraginfo, reset, line, len);
1450 break;
1451 case DIFF_SYMBOL_SUBMODULE_ADD:
1452 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1453 reset = diff_get_color_opt(o, DIFF_RESET);
1454 emit_line(o, set, reset, line, len);
1455 break;
1456 case DIFF_SYMBOL_SUBMODULE_DEL:
1457 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1458 reset = diff_get_color_opt(o, DIFF_RESET);
1459 emit_line(o, set, reset, line, len);
1460 break;
1461 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1462 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1463 diff_line_prefix(o), line);
1464 break;
1465 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1466 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1467 diff_line_prefix(o), line);
1468 break;
1469 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1470 emit_line(o, "", "", " 0 files changed\n",
1471 strlen(" 0 files changed\n"));
1472 break;
1473 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1474 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1475 break;
1476 case DIFF_SYMBOL_WORD_DIFF:
1477 fprintf(o->file, "%.*s", len, line);
1478 break;
1479 case DIFF_SYMBOL_STAT_SEP:
1480 fputs(o->stat_sep, o->file);
1481 break;
1482 default:
1483 BUG("unknown diff symbol");
1484 }
1485 strbuf_release(&sb);
1486 }
1487
1488 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1489 const char *line, int len, unsigned flags)
1490 {
1491 struct emitted_diff_symbol e = {line, len, flags, s};
1492
1493 if (o->emitted_symbols)
1494 append_emitted_diff_symbol(o, &e);
1495 else
1496 emit_diff_symbol_from_struct(o, &e);
1497 }
1498
1499 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1500 {
1501 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1502 }
1503
1504 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1505 {
1506 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1507 }
1508
1509 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1510 {
1511 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1512 path, strlen(path), 0);
1513 }
1514
1515 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1516 {
1517 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1518 path, strlen(path), 0);
1519 }
1520
1521 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1522 {
1523 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1524 header, strlen(header), 0);
1525 }
1526
1527 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1528 {
1529 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1530 }
1531
1532 void diff_emit_submodule_pipethrough(struct diff_options *o,
1533 const char *line, int len)
1534 {
1535 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1536 }
1537
1538 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1539 {
1540 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1541 ecbdata->blank_at_eof_in_preimage &&
1542 ecbdata->blank_at_eof_in_postimage &&
1543 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1544 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1545 return 0;
1546 return ws_blank_line(line, len, ecbdata->ws_rule);
1547 }
1548
1549 static void emit_add_line(const char *reset,
1550 struct emit_callback *ecbdata,
1551 const char *line, int len)
1552 {
1553 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1554 if (new_blank_line_at_eof(ecbdata, line, len))
1555 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1556
1557 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1558 }
1559
1560 static void emit_del_line(const char *reset,
1561 struct emit_callback *ecbdata,
1562 const char *line, int len)
1563 {
1564 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1565 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1566 }
1567
1568 static void emit_context_line(const char *reset,
1569 struct emit_callback *ecbdata,
1570 const char *line, int len)
1571 {
1572 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1573 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1574 }
1575
1576 static void emit_hunk_header(struct emit_callback *ecbdata,
1577 const char *line, int len)
1578 {
1579 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1580 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1581 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1582 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1583 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1584 static const char atat[2] = { '@', '@' };
1585 const char *cp, *ep;
1586 struct strbuf msgbuf = STRBUF_INIT;
1587 int org_len = len;
1588 int i = 1;
1589
1590 /*
1591 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1592 * it always is at least 10 bytes long.
1593 */
1594 if (len < 10 ||
1595 memcmp(line, atat, 2) ||
1596 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1597 emit_diff_symbol(ecbdata->opt,
1598 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1599 return;
1600 }
1601 ep += 2; /* skip over @@ */
1602
1603 /* The hunk header in fraginfo color */
1604 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1605 strbuf_addstr(&msgbuf, reverse);
1606 strbuf_addstr(&msgbuf, frag);
1607 strbuf_add(&msgbuf, line, ep - line);
1608 strbuf_addstr(&msgbuf, reset);
1609
1610 /*
1611 * trailing "\r\n"
1612 */
1613 for ( ; i < 3; i++)
1614 if (line[len - i] == '\r' || line[len - i] == '\n')
1615 len--;
1616
1617 /* blank before the func header */
1618 for (cp = ep; ep - line < len; ep++)
1619 if (*ep != ' ' && *ep != '\t')
1620 break;
1621 if (ep != cp) {
1622 strbuf_addstr(&msgbuf, context);
1623 strbuf_add(&msgbuf, cp, ep - cp);
1624 strbuf_addstr(&msgbuf, reset);
1625 }
1626
1627 if (ep < line + len) {
1628 strbuf_addstr(&msgbuf, func);
1629 strbuf_add(&msgbuf, ep, line + len - ep);
1630 strbuf_addstr(&msgbuf, reset);
1631 }
1632
1633 strbuf_add(&msgbuf, line + len, org_len - len);
1634 strbuf_complete_line(&msgbuf);
1635 emit_diff_symbol(ecbdata->opt,
1636 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1637 strbuf_release(&msgbuf);
1638 }
1639
1640 static struct diff_tempfile *claim_diff_tempfile(void)
1641 {
1642 int i;
1643 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1644 if (!diff_temp[i].name)
1645 return diff_temp + i;
1646 BUG("diff is failing to clean up its tempfiles");
1647 }
1648
1649 static void remove_tempfile(void)
1650 {
1651 int i;
1652 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1653 if (is_tempfile_active(diff_temp[i].tempfile))
1654 delete_tempfile(&diff_temp[i].tempfile);
1655 diff_temp[i].name = NULL;
1656 }
1657 }
1658
1659 static void add_line_count(struct strbuf *out, int count)
1660 {
1661 switch (count) {
1662 case 0:
1663 strbuf_addstr(out, "0,0");
1664 break;
1665 case 1:
1666 strbuf_addstr(out, "1");
1667 break;
1668 default:
1669 strbuf_addf(out, "1,%d", count);
1670 break;
1671 }
1672 }
1673
1674 static void emit_rewrite_lines(struct emit_callback *ecb,
1675 int prefix, const char *data, int size)
1676 {
1677 const char *endp = NULL;
1678 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1679
1680 while (0 < size) {
1681 int len;
1682
1683 endp = memchr(data, '\n', size);
1684 len = endp ? (endp - data + 1) : size;
1685 if (prefix != '+') {
1686 ecb->lno_in_preimage++;
1687 emit_del_line(reset, ecb, data, len);
1688 } else {
1689 ecb->lno_in_postimage++;
1690 emit_add_line(reset, ecb, data, len);
1691 }
1692 size -= len;
1693 data += len;
1694 }
1695 if (!endp)
1696 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1697 }
1698
1699 static void emit_rewrite_diff(const char *name_a,
1700 const char *name_b,
1701 struct diff_filespec *one,
1702 struct diff_filespec *two,
1703 struct userdiff_driver *textconv_one,
1704 struct userdiff_driver *textconv_two,
1705 struct diff_options *o)
1706 {
1707 int lc_a, lc_b;
1708 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1709 const char *a_prefix, *b_prefix;
1710 char *data_one, *data_two;
1711 size_t size_one, size_two;
1712 struct emit_callback ecbdata;
1713 struct strbuf out = STRBUF_INIT;
1714
1715 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1716 a_prefix = o->b_prefix;
1717 b_prefix = o->a_prefix;
1718 } else {
1719 a_prefix = o->a_prefix;
1720 b_prefix = o->b_prefix;
1721 }
1722
1723 name_a += (*name_a == '/');
1724 name_b += (*name_b == '/');
1725
1726 strbuf_reset(&a_name);
1727 strbuf_reset(&b_name);
1728 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1729 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1730
1731 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1732 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1733
1734 memset(&ecbdata, 0, sizeof(ecbdata));
1735 ecbdata.color_diff = want_color(o->use_color);
1736 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1737 ecbdata.opt = o;
1738 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1739 mmfile_t mf1, mf2;
1740 mf1.ptr = (char *)data_one;
1741 mf2.ptr = (char *)data_two;
1742 mf1.size = size_one;
1743 mf2.size = size_two;
1744 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1745 }
1746 ecbdata.lno_in_preimage = 1;
1747 ecbdata.lno_in_postimage = 1;
1748
1749 lc_a = count_lines(data_one, size_one);
1750 lc_b = count_lines(data_two, size_two);
1751
1752 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1753 a_name.buf, a_name.len, 0);
1754 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1755 b_name.buf, b_name.len, 0);
1756
1757 strbuf_addstr(&out, "@@ -");
1758 if (!o->irreversible_delete)
1759 add_line_count(&out, lc_a);
1760 else
1761 strbuf_addstr(&out, "?,?");
1762 strbuf_addstr(&out, " +");
1763 add_line_count(&out, lc_b);
1764 strbuf_addstr(&out, " @@\n");
1765 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1766 strbuf_release(&out);
1767
1768 if (lc_a && !o->irreversible_delete)
1769 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1770 if (lc_b)
1771 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1772 if (textconv_one)
1773 free((char *)data_one);
1774 if (textconv_two)
1775 free((char *)data_two);
1776 }
1777
1778 struct diff_words_buffer {
1779 mmfile_t text;
1780 unsigned long alloc;
1781 struct diff_words_orig {
1782 const char *begin, *end;
1783 } *orig;
1784 int orig_nr, orig_alloc;
1785 };
1786
1787 static void diff_words_append(char *line, unsigned long len,
1788 struct diff_words_buffer *buffer)
1789 {
1790 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1791 line++;
1792 len--;
1793 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1794 buffer->text.size += len;
1795 buffer->text.ptr[buffer->text.size] = '\0';
1796 }
1797
1798 struct diff_words_style_elem {
1799 const char *prefix;
1800 const char *suffix;
1801 const char *color; /* NULL; filled in by the setup code if
1802 * color is enabled */
1803 };
1804
1805 struct diff_words_style {
1806 enum diff_words_type type;
1807 struct diff_words_style_elem new_word, old_word, ctx;
1808 const char *newline;
1809 };
1810
1811 static struct diff_words_style diff_words_styles[] = {
1812 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1813 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1814 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1815 };
1816
1817 struct diff_words_data {
1818 struct diff_words_buffer minus, plus;
1819 const char *current_plus;
1820 int last_minus;
1821 struct diff_options *opt;
1822 regex_t *word_regex;
1823 enum diff_words_type type;
1824 struct diff_words_style *style;
1825 };
1826
1827 static int fn_out_diff_words_write_helper(struct diff_options *o,
1828 struct diff_words_style_elem *st_el,
1829 const char *newline,
1830 size_t count, const char *buf)
1831 {
1832 int print = 0;
1833 struct strbuf sb = STRBUF_INIT;
1834
1835 while (count) {
1836 char *p = memchr(buf, '\n', count);
1837 if (print)
1838 strbuf_addstr(&sb, diff_line_prefix(o));
1839
1840 if (p != buf) {
1841 const char *reset = st_el->color && *st_el->color ?
1842 GIT_COLOR_RESET : NULL;
1843 if (st_el->color && *st_el->color)
1844 strbuf_addstr(&sb, st_el->color);
1845 strbuf_addstr(&sb, st_el->prefix);
1846 strbuf_add(&sb, buf, p ? p - buf : count);
1847 strbuf_addstr(&sb, st_el->suffix);
1848 if (reset)
1849 strbuf_addstr(&sb, reset);
1850 }
1851 if (!p)
1852 goto out;
1853
1854 strbuf_addstr(&sb, newline);
1855 count -= p + 1 - buf;
1856 buf = p + 1;
1857 print = 1;
1858 if (count) {
1859 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1860 sb.buf, sb.len, 0);
1861 strbuf_reset(&sb);
1862 }
1863 }
1864
1865 out:
1866 if (sb.len)
1867 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1868 sb.buf, sb.len, 0);
1869 strbuf_release(&sb);
1870 return 0;
1871 }
1872
1873 /*
1874 * '--color-words' algorithm can be described as:
1875 *
1876 * 1. collect the minus/plus lines of a diff hunk, divided into
1877 * minus-lines and plus-lines;
1878 *
1879 * 2. break both minus-lines and plus-lines into words and
1880 * place them into two mmfile_t with one word for each line;
1881 *
1882 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1883 *
1884 * And for the common parts of the both file, we output the plus side text.
1885 * diff_words->current_plus is used to trace the current position of the plus file
1886 * which printed. diff_words->last_minus is used to trace the last minus word
1887 * printed.
1888 *
1889 * For '--graph' to work with '--color-words', we need to output the graph prefix
1890 * on each line of color words output. Generally, there are two conditions on
1891 * which we should output the prefix.
1892 *
1893 * 1. diff_words->last_minus == 0 &&
1894 * diff_words->current_plus == diff_words->plus.text.ptr
1895 *
1896 * that is: the plus text must start as a new line, and if there is no minus
1897 * word printed, a graph prefix must be printed.
1898 *
1899 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1900 * *(diff_words->current_plus - 1) == '\n'
1901 *
1902 * that is: a graph prefix must be printed following a '\n'
1903 */
1904 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1905 {
1906 if ((diff_words->last_minus == 0 &&
1907 diff_words->current_plus == diff_words->plus.text.ptr) ||
1908 (diff_words->current_plus > diff_words->plus.text.ptr &&
1909 *(diff_words->current_plus - 1) == '\n')) {
1910 return 1;
1911 } else {
1912 return 0;
1913 }
1914 }
1915
1916 static void fn_out_diff_words_aux(void *priv,
1917 long minus_first, long minus_len,
1918 long plus_first, long plus_len,
1919 const char *func, long funclen)
1920 {
1921 struct diff_words_data *diff_words = priv;
1922 struct diff_words_style *style = diff_words->style;
1923 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1924 struct diff_options *opt = diff_words->opt;
1925 const char *line_prefix;
1926
1927 assert(opt);
1928 line_prefix = diff_line_prefix(opt);
1929
1930 /* POSIX requires that first be decremented by one if len == 0... */
1931 if (minus_len) {
1932 minus_begin = diff_words->minus.orig[minus_first].begin;
1933 minus_end =
1934 diff_words->minus.orig[minus_first + minus_len - 1].end;
1935 } else
1936 minus_begin = minus_end =
1937 diff_words->minus.orig[minus_first].end;
1938
1939 if (plus_len) {
1940 plus_begin = diff_words->plus.orig[plus_first].begin;
1941 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1942 } else
1943 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1944
1945 if (color_words_output_graph_prefix(diff_words)) {
1946 fputs(line_prefix, diff_words->opt->file);
1947 }
1948 if (diff_words->current_plus != plus_begin) {
1949 fn_out_diff_words_write_helper(diff_words->opt,
1950 &style->ctx, style->newline,
1951 plus_begin - diff_words->current_plus,
1952 diff_words->current_plus);
1953 }
1954 if (minus_begin != minus_end) {
1955 fn_out_diff_words_write_helper(diff_words->opt,
1956 &style->old_word, style->newline,
1957 minus_end - minus_begin, minus_begin);
1958 }
1959 if (plus_begin != plus_end) {
1960 fn_out_diff_words_write_helper(diff_words->opt,
1961 &style->new_word, style->newline,
1962 plus_end - plus_begin, plus_begin);
1963 }
1964
1965 diff_words->current_plus = plus_end;
1966 diff_words->last_minus = minus_first;
1967 }
1968
1969 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1970 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1971 int *begin, int *end)
1972 {
1973 if (word_regex && *begin < buffer->size) {
1974 regmatch_t match[1];
1975 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1976 buffer->size - *begin, 1, match, 0)) {
1977 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1978 '\n', match[0].rm_eo - match[0].rm_so);
1979 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1980 *begin += match[0].rm_so;
1981 return *begin >= *end;
1982 }
1983 return -1;
1984 }
1985
1986 /* find the next word */
1987 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1988 (*begin)++;
1989 if (*begin >= buffer->size)
1990 return -1;
1991
1992 /* find the end of the word */
1993 *end = *begin + 1;
1994 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1995 (*end)++;
1996
1997 return 0;
1998 }
1999
2000 /*
2001 * This function splits the words in buffer->text, stores the list with
2002 * newline separator into out, and saves the offsets of the original words
2003 * in buffer->orig.
2004 */
2005 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2006 regex_t *word_regex)
2007 {
2008 int i, j;
2009 long alloc = 0;
2010
2011 out->size = 0;
2012 out->ptr = NULL;
2013
2014 /* fake an empty "0th" word */
2015 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2016 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2017 buffer->orig_nr = 1;
2018
2019 for (i = 0; i < buffer->text.size; i++) {
2020 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2021 return;
2022
2023 /* store original boundaries */
2024 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2025 buffer->orig_alloc);
2026 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2027 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2028 buffer->orig_nr++;
2029
2030 /* store one word */
2031 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2032 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2033 out->ptr[out->size + j - i] = '\n';
2034 out->size += j - i + 1;
2035
2036 i = j - 1;
2037 }
2038 }
2039
2040 /* this executes the word diff on the accumulated buffers */
2041 static void diff_words_show(struct diff_words_data *diff_words)
2042 {
2043 xpparam_t xpp;
2044 xdemitconf_t xecfg;
2045 mmfile_t minus, plus;
2046 struct diff_words_style *style = diff_words->style;
2047
2048 struct diff_options *opt = diff_words->opt;
2049 const char *line_prefix;
2050
2051 assert(opt);
2052 line_prefix = diff_line_prefix(opt);
2053
2054 /* special case: only removal */
2055 if (!diff_words->plus.text.size) {
2056 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2057 line_prefix, strlen(line_prefix), 0);
2058 fn_out_diff_words_write_helper(diff_words->opt,
2059 &style->old_word, style->newline,
2060 diff_words->minus.text.size,
2061 diff_words->minus.text.ptr);
2062 diff_words->minus.text.size = 0;
2063 return;
2064 }
2065
2066 diff_words->current_plus = diff_words->plus.text.ptr;
2067 diff_words->last_minus = 0;
2068
2069 memset(&xpp, 0, sizeof(xpp));
2070 memset(&xecfg, 0, sizeof(xecfg));
2071 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2072 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2073 xpp.flags = 0;
2074 /* as only the hunk header will be parsed, we need a 0-context */
2075 xecfg.ctxlen = 0;
2076 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2077 diff_words, &xpp, &xecfg))
2078 die("unable to generate word diff");
2079 free(minus.ptr);
2080 free(plus.ptr);
2081 if (diff_words->current_plus != diff_words->plus.text.ptr +
2082 diff_words->plus.text.size) {
2083 if (color_words_output_graph_prefix(diff_words))
2084 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2085 line_prefix, strlen(line_prefix), 0);
2086 fn_out_diff_words_write_helper(diff_words->opt,
2087 &style->ctx, style->newline,
2088 diff_words->plus.text.ptr + diff_words->plus.text.size
2089 - diff_words->current_plus, diff_words->current_plus);
2090 }
2091 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2092 }
2093
2094 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2095 static void diff_words_flush(struct emit_callback *ecbdata)
2096 {
2097 struct diff_options *wo = ecbdata->diff_words->opt;
2098
2099 if (ecbdata->diff_words->minus.text.size ||
2100 ecbdata->diff_words->plus.text.size)
2101 diff_words_show(ecbdata->diff_words);
2102
2103 if (wo->emitted_symbols) {
2104 struct diff_options *o = ecbdata->opt;
2105 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2106 int i;
2107
2108 /*
2109 * NEEDSWORK:
2110 * Instead of appending each, concat all words to a line?
2111 */
2112 for (i = 0; i < wol->nr; i++)
2113 append_emitted_diff_symbol(o, &wol->buf[i]);
2114
2115 for (i = 0; i < wol->nr; i++)
2116 free((void *)wol->buf[i].line);
2117
2118 wol->nr = 0;
2119 }
2120 }
2121
2122 static void diff_filespec_load_driver(struct diff_filespec *one,
2123 struct index_state *istate)
2124 {
2125 /* Use already-loaded driver */
2126 if (one->driver)
2127 return;
2128
2129 if (S_ISREG(one->mode))
2130 one->driver = userdiff_find_by_path(istate, one->path);
2131
2132 /* Fallback to default settings */
2133 if (!one->driver)
2134 one->driver = userdiff_find_by_name("default");
2135 }
2136
2137 static const char *userdiff_word_regex(struct diff_filespec *one,
2138 struct index_state *istate)
2139 {
2140 diff_filespec_load_driver(one, istate);
2141 return one->driver->word_regex;
2142 }
2143
2144 static void init_diff_words_data(struct emit_callback *ecbdata,
2145 struct diff_options *orig_opts,
2146 struct diff_filespec *one,
2147 struct diff_filespec *two)
2148 {
2149 int i;
2150 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2151 memcpy(o, orig_opts, sizeof(struct diff_options));
2152
2153 ecbdata->diff_words =
2154 xcalloc(1, sizeof(struct diff_words_data));
2155 ecbdata->diff_words->type = o->word_diff;
2156 ecbdata->diff_words->opt = o;
2157
2158 if (orig_opts->emitted_symbols)
2159 o->emitted_symbols =
2160 xcalloc(1, sizeof(struct emitted_diff_symbols));
2161
2162 if (!o->word_regex)
2163 o->word_regex = userdiff_word_regex(one, o->repo->index);
2164 if (!o->word_regex)
2165 o->word_regex = userdiff_word_regex(two, o->repo->index);
2166 if (!o->word_regex)
2167 o->word_regex = diff_word_regex_cfg;
2168 if (o->word_regex) {
2169 ecbdata->diff_words->word_regex = (regex_t *)
2170 xmalloc(sizeof(regex_t));
2171 if (regcomp(ecbdata->diff_words->word_regex,
2172 o->word_regex,
2173 REG_EXTENDED | REG_NEWLINE))
2174 die("invalid regular expression: %s",
2175 o->word_regex);
2176 }
2177 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2178 if (o->word_diff == diff_words_styles[i].type) {
2179 ecbdata->diff_words->style =
2180 &diff_words_styles[i];
2181 break;
2182 }
2183 }
2184 if (want_color(o->use_color)) {
2185 struct diff_words_style *st = ecbdata->diff_words->style;
2186 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2187 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2188 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2189 }
2190 }
2191
2192 static void free_diff_words_data(struct emit_callback *ecbdata)
2193 {
2194 if (ecbdata->diff_words) {
2195 diff_words_flush(ecbdata);
2196 free (ecbdata->diff_words->opt->emitted_symbols);
2197 free (ecbdata->diff_words->opt);
2198 free (ecbdata->diff_words->minus.text.ptr);
2199 free (ecbdata->diff_words->minus.orig);
2200 free (ecbdata->diff_words->plus.text.ptr);
2201 free (ecbdata->diff_words->plus.orig);
2202 if (ecbdata->diff_words->word_regex) {
2203 regfree(ecbdata->diff_words->word_regex);
2204 free(ecbdata->diff_words->word_regex);
2205 }
2206 FREE_AND_NULL(ecbdata->diff_words);
2207 }
2208 }
2209
2210 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2211 {
2212 if (want_color(diff_use_color))
2213 return diff_colors[ix];
2214 return "";
2215 }
2216
2217 const char *diff_line_prefix(struct diff_options *opt)
2218 {
2219 struct strbuf *msgbuf;
2220 if (!opt->output_prefix)
2221 return "";
2222
2223 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2224 return msgbuf->buf;
2225 }
2226
2227 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2228 {
2229 const char *cp;
2230 unsigned long allot;
2231 size_t l = len;
2232
2233 cp = line;
2234 allot = l;
2235 while (0 < l) {
2236 (void) utf8_width(&cp, &l);
2237 if (!cp)
2238 break; /* truncated in the middle? */
2239 }
2240 return allot - l;
2241 }
2242
2243 static void find_lno(const char *line, struct emit_callback *ecbdata)
2244 {
2245 const char *p;
2246 ecbdata->lno_in_preimage = 0;
2247 ecbdata->lno_in_postimage = 0;
2248 p = strchr(line, '-');
2249 if (!p)
2250 return; /* cannot happen */
2251 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2252 p = strchr(p, '+');
2253 if (!p)
2254 return; /* cannot happen */
2255 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2256 }
2257
2258 static void fn_out_consume(void *priv, char *line, unsigned long len)
2259 {
2260 struct emit_callback *ecbdata = priv;
2261 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2262 struct diff_options *o = ecbdata->opt;
2263
2264 o->found_changes = 1;
2265
2266 if (ecbdata->header) {
2267 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2268 ecbdata->header->buf, ecbdata->header->len, 0);
2269 strbuf_reset(ecbdata->header);
2270 ecbdata->header = NULL;
2271 }
2272
2273 if (ecbdata->label_path[0]) {
2274 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2275 ecbdata->label_path[0],
2276 strlen(ecbdata->label_path[0]), 0);
2277 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2278 ecbdata->label_path[1],
2279 strlen(ecbdata->label_path[1]), 0);
2280 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2281 }
2282
2283 if (diff_suppress_blank_empty
2284 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2285 line[0] = '\n';
2286 len = 1;
2287 }
2288
2289 if (line[0] == '@') {
2290 if (ecbdata->diff_words)
2291 diff_words_flush(ecbdata);
2292 len = sane_truncate_line(ecbdata, line, len);
2293 find_lno(line, ecbdata);
2294 emit_hunk_header(ecbdata, line, len);
2295 return;
2296 }
2297
2298 if (ecbdata->diff_words) {
2299 enum diff_symbol s =
2300 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2301 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2302 if (line[0] == '-') {
2303 diff_words_append(line, len,
2304 &ecbdata->diff_words->minus);
2305 return;
2306 } else if (line[0] == '+') {
2307 diff_words_append(line, len,
2308 &ecbdata->diff_words->plus);
2309 return;
2310 } else if (starts_with(line, "\\ ")) {
2311 /*
2312 * Eat the "no newline at eof" marker as if we
2313 * saw a "+" or "-" line with nothing on it,
2314 * and return without diff_words_flush() to
2315 * defer processing. If this is the end of
2316 * preimage, more "+" lines may come after it.
2317 */
2318 return;
2319 }
2320 diff_words_flush(ecbdata);
2321 emit_diff_symbol(o, s, line, len, 0);
2322 return;
2323 }
2324
2325 switch (line[0]) {
2326 case '+':
2327 ecbdata->lno_in_postimage++;
2328 emit_add_line(reset, ecbdata, line + 1, len - 1);
2329 break;
2330 case '-':
2331 ecbdata->lno_in_preimage++;
2332 emit_del_line(reset, ecbdata, line + 1, len - 1);
2333 break;
2334 case ' ':
2335 ecbdata->lno_in_postimage++;
2336 ecbdata->lno_in_preimage++;
2337 emit_context_line(reset, ecbdata, line + 1, len - 1);
2338 break;
2339 default:
2340 /* incomplete line at the end */
2341 ecbdata->lno_in_preimage++;
2342 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2343 line, len, 0);
2344 break;
2345 }
2346 }
2347
2348 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2349 {
2350 const char *old_name = a;
2351 const char *new_name = b;
2352 int pfx_length, sfx_length;
2353 int pfx_adjust_for_slash;
2354 int len_a = strlen(a);
2355 int len_b = strlen(b);
2356 int a_midlen, b_midlen;
2357 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2358 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2359
2360 if (qlen_a || qlen_b) {
2361 quote_c_style(a, name, NULL, 0);
2362 strbuf_addstr(name, " => ");
2363 quote_c_style(b, name, NULL, 0);
2364 return;
2365 }
2366
2367 /* Find common prefix */
2368 pfx_length = 0;
2369 while (*old_name && *new_name && *old_name == *new_name) {
2370 if (*old_name == '/')
2371 pfx_length = old_name - a + 1;
2372 old_name++;
2373 new_name++;
2374 }
2375
2376 /* Find common suffix */
2377 old_name = a + len_a;
2378 new_name = b + len_b;
2379 sfx_length = 0;
2380 /*
2381 * If there is a common prefix, it must end in a slash. In
2382 * that case we let this loop run 1 into the prefix to see the
2383 * same slash.
2384 *
2385 * If there is no common prefix, we cannot do this as it would
2386 * underrun the input strings.
2387 */
2388 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2389 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2390 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2391 *old_name == *new_name) {
2392 if (*old_name == '/')
2393 sfx_length = len_a - (old_name - a);
2394 old_name--;
2395 new_name--;
2396 }
2397
2398 /*
2399 * pfx{mid-a => mid-b}sfx
2400 * {pfx-a => pfx-b}sfx
2401 * pfx{sfx-a => sfx-b}
2402 * name-a => name-b
2403 */
2404 a_midlen = len_a - pfx_length - sfx_length;
2405 b_midlen = len_b - pfx_length - sfx_length;
2406 if (a_midlen < 0)
2407 a_midlen = 0;
2408 if (b_midlen < 0)
2409 b_midlen = 0;
2410
2411 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2412 if (pfx_length + sfx_length) {
2413 strbuf_add(name, a, pfx_length);
2414 strbuf_addch(name, '{');
2415 }
2416 strbuf_add(name, a + pfx_length, a_midlen);
2417 strbuf_addstr(name, " => ");
2418 strbuf_add(name, b + pfx_length, b_midlen);
2419 if (pfx_length + sfx_length) {
2420 strbuf_addch(name, '}');
2421 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2422 }
2423 }
2424
2425 struct diffstat_t {
2426 int nr;
2427 int alloc;
2428 struct diffstat_file {
2429 char *from_name;
2430 char *name;
2431 char *print_name;
2432 const char *comments;
2433 unsigned is_unmerged:1;
2434 unsigned is_binary:1;
2435 unsigned is_renamed:1;
2436 unsigned is_interesting:1;
2437 uintmax_t added, deleted;
2438 } **files;
2439 };
2440
2441 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2442 const char *name_a,
2443 const char *name_b)
2444 {
2445 struct diffstat_file *x;
2446 x = xcalloc(1, sizeof(*x));
2447 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2448 diffstat->files[diffstat->nr++] = x;
2449 if (name_b) {
2450 x->from_name = xstrdup(name_a);
2451 x->name = xstrdup(name_b);
2452 x->is_renamed = 1;
2453 }
2454 else {
2455 x->from_name = NULL;
2456 x->name = xstrdup(name_a);
2457 }
2458 return x;
2459 }
2460
2461 static void diffstat_consume(void *priv, char *line, unsigned long len)
2462 {
2463 struct diffstat_t *diffstat = priv;
2464 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2465
2466 if (line[0] == '+')
2467 x->added++;
2468 else if (line[0] == '-')
2469 x->deleted++;
2470 }
2471
2472 const char mime_boundary_leader[] = "------------";
2473
2474 static int scale_linear(int it, int width, int max_change)
2475 {
2476 if (!it)
2477 return 0;
2478 /*
2479 * make sure that at least one '-' or '+' is printed if
2480 * there is any change to this path. The easiest way is to
2481 * scale linearly as if the alloted width is one column shorter
2482 * than it is, and then add 1 to the result.
2483 */
2484 return 1 + (it * (width - 1) / max_change);
2485 }
2486
2487 static void show_graph(struct strbuf *out, char ch, int cnt,
2488 const char *set, const char *reset)
2489 {
2490 if (cnt <= 0)
2491 return;
2492 strbuf_addstr(out, set);
2493 strbuf_addchars(out, ch, cnt);
2494 strbuf_addstr(out, reset);
2495 }
2496
2497 static void fill_print_name(struct diffstat_file *file)
2498 {
2499 struct strbuf pname = STRBUF_INIT;
2500
2501 if (file->print_name)
2502 return;
2503
2504 if (file->is_renamed)
2505 pprint_rename(&pname, file->from_name, file->name);
2506 else
2507 quote_c_style(file->name, &pname, NULL, 0);
2508
2509 if (file->comments)
2510 strbuf_addf(&pname, " (%s)", file->comments);
2511
2512 file->print_name = strbuf_detach(&pname, NULL);
2513 }
2514
2515 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2516 int files, int insertions, int deletions)
2517 {
2518 struct strbuf sb = STRBUF_INIT;
2519
2520 if (!files) {
2521 assert(insertions == 0 && deletions == 0);
2522 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2523 NULL, 0, 0);
2524 return;
2525 }
2526
2527 strbuf_addf(&sb,
2528 (files == 1) ? " %d file changed" : " %d files changed",
2529 files);
2530
2531 /*
2532 * For binary diff, the caller may want to print "x files
2533 * changed" with insertions == 0 && deletions == 0.
2534 *
2535 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2536 * is probably less confusing (i.e skip over "2 files changed
2537 * but nothing about added/removed lines? Is this a bug in Git?").
2538 */
2539 if (insertions || deletions == 0) {
2540 strbuf_addf(&sb,
2541 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2542 insertions);
2543 }
2544
2545 if (deletions || insertions == 0) {
2546 strbuf_addf(&sb,
2547 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2548 deletions);
2549 }
2550 strbuf_addch(&sb, '\n');
2551 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2552 sb.buf, sb.len, 0);
2553 strbuf_release(&sb);
2554 }
2555
2556 void print_stat_summary(FILE *fp, int files,
2557 int insertions, int deletions)
2558 {
2559 struct diff_options o;
2560 memset(&o, 0, sizeof(o));
2561 o.file = fp;
2562
2563 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2564 }
2565
2566 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2567 {
2568 int i, len, add, del, adds = 0, dels = 0;
2569 uintmax_t max_change = 0, max_len = 0;
2570 int total_files = data->nr, count;
2571 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2572 const char *reset, *add_c, *del_c;
2573 int extra_shown = 0;
2574 const char *line_prefix = diff_line_prefix(options);
2575 struct strbuf out = STRBUF_INIT;
2576
2577 if (data->nr == 0)
2578 return;
2579
2580 count = options->stat_count ? options->stat_count : data->nr;
2581
2582 reset = diff_get_color_opt(options, DIFF_RESET);
2583 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2584 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2585
2586 /*
2587 * Find the longest filename and max number of changes
2588 */
2589 for (i = 0; (i < count) && (i < data->nr); i++) {
2590 struct diffstat_file *file = data->files[i];
2591 uintmax_t change = file->added + file->deleted;
2592
2593 if (!file->is_interesting && (change == 0)) {
2594 count++; /* not shown == room for one more */
2595 continue;
2596 }
2597 fill_print_name(file);
2598 len = strlen(file->print_name);
2599 if (max_len < len)
2600 max_len = len;
2601
2602 if (file->is_unmerged) {
2603 /* "Unmerged" is 8 characters */
2604 bin_width = bin_width < 8 ? 8 : bin_width;
2605 continue;
2606 }
2607 if (file->is_binary) {
2608 /* "Bin XXX -> YYY bytes" */
2609 int w = 14 + decimal_width(file->added)
2610 + decimal_width(file->deleted);
2611 bin_width = bin_width < w ? w : bin_width;
2612 /* Display change counts aligned with "Bin" */
2613 number_width = 3;
2614 continue;
2615 }
2616
2617 if (max_change < change)
2618 max_change = change;
2619 }
2620 count = i; /* where we can stop scanning in data->files[] */
2621
2622 /*
2623 * We have width = stat_width or term_columns() columns total.
2624 * We want a maximum of min(max_len, stat_name_width) for the name part.
2625 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2626 * We also need 1 for " " and 4 + decimal_width(max_change)
2627 * for " | NNNN " and one the empty column at the end, altogether
2628 * 6 + decimal_width(max_change).
2629 *
2630 * If there's not enough space, we will use the smaller of
2631 * stat_name_width (if set) and 5/8*width for the filename,
2632 * and the rest for constant elements + graph part, but no more
2633 * than stat_graph_width for the graph part.
2634 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2635 * for the standard terminal size).
2636 *
2637 * In other words: stat_width limits the maximum width, and
2638 * stat_name_width fixes the maximum width of the filename,
2639 * and is also used to divide available columns if there
2640 * aren't enough.
2641 *
2642 * Binary files are displayed with "Bin XXX -> YYY bytes"
2643 * instead of the change count and graph. This part is treated
2644 * similarly to the graph part, except that it is not
2645 * "scaled". If total width is too small to accommodate the
2646 * guaranteed minimum width of the filename part and the
2647 * separators and this message, this message will "overflow"
2648 * making the line longer than the maximum width.
2649 */
2650
2651 if (options->stat_width == -1)
2652 width = term_columns() - strlen(line_prefix);
2653 else
2654 width = options->stat_width ? options->stat_width : 80;
2655 number_width = decimal_width(max_change) > number_width ?
2656 decimal_width(max_change) : number_width;
2657
2658 if (options->stat_graph_width == -1)
2659 options->stat_graph_width = diff_stat_graph_width;
2660
2661 /*
2662 * Guarantee 3/8*16==6 for the graph part
2663 * and 5/8*16==10 for the filename part
2664 */
2665 if (width < 16 + 6 + number_width)
2666 width = 16 + 6 + number_width;
2667
2668 /*
2669 * First assign sizes that are wanted, ignoring available width.
2670 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2671 * starting from "XXX" should fit in graph_width.
2672 */
2673 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2674 if (options->stat_graph_width &&
2675 options->stat_graph_width < graph_width)
2676 graph_width = options->stat_graph_width;
2677
2678 name_width = (options->stat_name_width > 0 &&
2679 options->stat_name_width < max_len) ?
2680 options->stat_name_width : max_len;
2681
2682 /*
2683 * Adjust adjustable widths not to exceed maximum width
2684 */
2685 if (name_width + number_width + 6 + graph_width > width) {
2686 if (graph_width > width * 3/8 - number_width - 6) {
2687 graph_width = width * 3/8 - number_width - 6;
2688 if (graph_width < 6)
2689 graph_width = 6;
2690 }
2691
2692 if (options->stat_graph_width &&
2693 graph_width > options->stat_graph_width)
2694 graph_width = options->stat_graph_width;
2695 if (name_width > width - number_width - 6 - graph_width)
2696 name_width = width - number_width - 6 - graph_width;
2697 else
2698 graph_width = width - number_width - 6 - name_width;
2699 }
2700
2701 /*
2702 * From here name_width is the width of the name area,
2703 * and graph_width is the width of the graph area.
2704 * max_change is used to scale graph properly.
2705 */
2706 for (i = 0; i < count; i++) {
2707 const char *prefix = "";
2708 struct diffstat_file *file = data->files[i];
2709 char *name = file->print_name;
2710 uintmax_t added = file->added;
2711 uintmax_t deleted = file->deleted;
2712 int name_len;
2713
2714 if (!file->is_interesting && (added + deleted == 0))
2715 continue;
2716
2717 /*
2718 * "scale" the filename
2719 */
2720 len = name_width;
2721 name_len = strlen(name);
2722 if (name_width < name_len) {
2723 char *slash;
2724 prefix = "...";
2725 len -= 3;
2726 name += name_len - len;
2727 slash = strchr(name, '/');
2728 if (slash)
2729 name = slash;
2730 }
2731
2732 if (file->is_binary) {
2733 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2734 strbuf_addf(&out, " %*s", number_width, "Bin");
2735 if (!added && !deleted) {
2736 strbuf_addch(&out, '\n');
2737 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2738 out.buf, out.len, 0);
2739 strbuf_reset(&out);
2740 continue;
2741 }
2742 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2743 del_c, deleted, reset);
2744 strbuf_addstr(&out, " -> ");
2745 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2746 add_c, added, reset);
2747 strbuf_addstr(&out, " bytes\n");
2748 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2749 out.buf, out.len, 0);
2750 strbuf_reset(&out);
2751 continue;
2752 }
2753 else if (file->is_unmerged) {
2754 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2755 strbuf_addstr(&out, " Unmerged\n");
2756 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2757 out.buf, out.len, 0);
2758 strbuf_reset(&out);
2759 continue;
2760 }
2761
2762 /*
2763 * scale the add/delete
2764 */
2765 add = added;
2766 del = deleted;
2767
2768 if (graph_width <= max_change) {
2769 int total = scale_linear(add + del, graph_width, max_change);
2770 if (total < 2 && add && del)
2771 /* width >= 2 due to the sanity check */
2772 total = 2;
2773 if (add < del) {
2774 add = scale_linear(add, graph_width, max_change);
2775 del = total - add;
2776 } else {
2777 del = scale_linear(del, graph_width, max_change);
2778 add = total - del;
2779 }
2780 }
2781 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2782 strbuf_addf(&out, " %*"PRIuMAX"%s",
2783 number_width, added + deleted,
2784 added + deleted ? " " : "");
2785 show_graph(&out, '+', add, add_c, reset);
2786 show_graph(&out, '-', del, del_c, reset);
2787 strbuf_addch(&out, '\n');
2788 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2789 out.buf, out.len, 0);
2790 strbuf_reset(&out);
2791 }
2792
2793 for (i = 0; i < data->nr; i++) {
2794 struct diffstat_file *file = data->files[i];
2795 uintmax_t added = file->added;
2796 uintmax_t deleted = file->deleted;
2797
2798 if (file->is_unmerged ||
2799 (!file->is_interesting && (added + deleted == 0))) {
2800 total_files--;
2801 continue;
2802 }
2803
2804 if (!file->is_binary) {
2805 adds += added;
2806 dels += deleted;
2807 }
2808 if (i < count)
2809 continue;
2810 if (!extra_shown)
2811 emit_diff_symbol(options,
2812 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2813 NULL, 0, 0);
2814 extra_shown = 1;
2815 }
2816
2817 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2818 strbuf_release(&out);
2819 }
2820
2821 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2822 {
2823 int i, adds = 0, dels = 0, total_files = data->nr;
2824
2825 if (data->nr == 0)
2826 return;
2827
2828 for (i = 0; i < data->nr; i++) {
2829 int added = data->files[i]->added;
2830 int deleted = data->files[i]->deleted;
2831
2832 if (data->files[i]->is_unmerged ||
2833 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2834 total_files--;
2835 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2836 adds += added;
2837 dels += deleted;
2838 }
2839 }
2840 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2841 }
2842
2843 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2844 {
2845 int i;
2846
2847 if (data->nr == 0)
2848 return;
2849
2850 for (i = 0; i < data->nr; i++) {
2851 struct diffstat_file *file = data->files[i];
2852
2853 fprintf(options->file, "%s", diff_line_prefix(options));
2854
2855 if (file->is_binary)
2856 fprintf(options->file, "-\t-\t");
2857 else
2858 fprintf(options->file,
2859 "%"PRIuMAX"\t%"PRIuMAX"\t",
2860 file->added, file->deleted);
2861 if (options->line_termination) {
2862 fill_print_name(file);
2863 if (!file->is_renamed)
2864 write_name_quoted(file->name, options->file,
2865 options->line_termination);
2866 else {
2867 fputs(file->print_name, options->file);
2868 putc(options->line_termination, options->file);
2869 }
2870 } else {
2871 if (file->is_renamed) {
2872 putc('\0', options->file);
2873 write_name_quoted(file->from_name, options->file, '\0');
2874 }
2875 write_name_quoted(file->name, options->file, '\0');
2876 }
2877 }
2878 }
2879
2880 struct dirstat_file {
2881 const char *name;
2882 unsigned long changed;
2883 };
2884
2885 struct dirstat_dir {
2886 struct dirstat_file *files;
2887 int alloc, nr, permille, cumulative;
2888 };
2889
2890 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2891 unsigned long changed, const char *base, int baselen)
2892 {
2893 unsigned long sum_changes = 0;
2894 unsigned int sources = 0;
2895 const char *line_prefix = diff_line_prefix(opt);
2896
2897 while (dir->nr) {
2898 struct dirstat_file *f = dir->files;
2899 int namelen = strlen(f->name);
2900 unsigned long changes;
2901 char *slash;
2902
2903 if (namelen < baselen)
2904 break;
2905 if (memcmp(f->name, base, baselen))
2906 break;
2907 slash = strchr(f->name + baselen, '/');
2908 if (slash) {
2909 int newbaselen = slash + 1 - f->name;
2910 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2911 sources++;
2912 } else {
2913 changes = f->changed;
2914 dir->files++;
2915 dir->nr--;
2916 sources += 2;
2917 }
2918 sum_changes += changes;
2919 }
2920
2921 /*
2922 * We don't report dirstat's for
2923 * - the top level
2924 * - or cases where everything came from a single directory
2925 * under this directory (sources == 1).
2926 */
2927 if (baselen && sources != 1) {
2928 if (sum_changes) {
2929 int permille = sum_changes * 1000 / changed;
2930 if (permille >= dir->permille) {
2931 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2932 permille / 10, permille % 10, baselen, base);
2933 if (!dir->cumulative)
2934 return 0;
2935 }
2936 }
2937 }
2938 return sum_changes;
2939 }
2940
2941 static int dirstat_compare(const void *_a, const void *_b)
2942 {
2943 const struct dirstat_file *a = _a;
2944 const struct dirstat_file *b = _b;
2945 return strcmp(a->name, b->name);
2946 }
2947
2948 static void show_dirstat(struct diff_options *options)
2949 {
2950 int i;
2951 unsigned long changed;
2952 struct dirstat_dir dir;
2953 struct diff_queue_struct *q = &diff_queued_diff;
2954
2955 dir.files = NULL;
2956 dir.alloc = 0;
2957 dir.nr = 0;
2958 dir.permille = options->dirstat_permille;
2959 dir.cumulative = options->flags.dirstat_cumulative;
2960
2961 changed = 0;
2962 for (i = 0; i < q->nr; i++) {
2963 struct diff_filepair *p = q->queue[i];
2964 const char *name;
2965 unsigned long copied, added, damage;
2966
2967 name = p->two->path ? p->two->path : p->one->path;
2968
2969 if (p->one->oid_valid && p->two->oid_valid &&
2970 oideq(&p->one->oid, &p->two->oid)) {
2971 /*
2972 * The SHA1 has not changed, so pre-/post-content is
2973 * identical. We can therefore skip looking at the
2974 * file contents altogether.
2975 */
2976 damage = 0;
2977 goto found_damage;
2978 }
2979
2980 if (options->flags.dirstat_by_file) {
2981 /*
2982 * In --dirstat-by-file mode, we don't really need to
2983 * look at the actual file contents at all.
2984 * The fact that the SHA1 changed is enough for us to
2985 * add this file to the list of results
2986 * (with each file contributing equal damage).
2987 */
2988 damage = 1;
2989 goto found_damage;
2990 }
2991
2992 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2993 diff_populate_filespec(options->repo, p->one, 0);
2994 diff_populate_filespec(options->repo, p->two, 0);
2995 diffcore_count_changes(options->repo,
2996 p->one, p->two, NULL, NULL,
2997 &copied, &added);
2998 diff_free_filespec_data(p->one);
2999 diff_free_filespec_data(p->two);
3000 } else if (DIFF_FILE_VALID(p->one)) {
3001 diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
3002 copied = added = 0;
3003 diff_free_filespec_data(p->one);
3004 } else if (DIFF_FILE_VALID(p->two)) {
3005 diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
3006 copied = 0;
3007 added = p->two->size;
3008 diff_free_filespec_data(p->two);
3009 } else
3010 continue;
3011
3012 /*
3013 * Original minus copied is the removed material,
3014 * added is the new material. They are both damages
3015 * made to the preimage.
3016 * If the resulting damage is zero, we know that
3017 * diffcore_count_changes() considers the two entries to
3018 * be identical, but since the oid changed, we
3019 * know that there must have been _some_ kind of change,
3020 * so we force all entries to have damage > 0.
3021 */
3022 damage = (p->one->size - copied) + added;
3023 if (!damage)
3024 damage = 1;
3025
3026 found_damage:
3027 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3028 dir.files[dir.nr].name = name;
3029 dir.files[dir.nr].changed = damage;
3030 changed += damage;
3031 dir.nr++;
3032 }
3033
3034 /* This can happen even with many files, if everything was renames */
3035 if (!changed)
3036 return;
3037
3038 /* Show all directories with more than x% of the changes */
3039 QSORT(dir.files, dir.nr, dirstat_compare);
3040 gather_dirstat(options, &dir, changed, "", 0);
3041 }
3042
3043 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3044 {
3045 int i;
3046 unsigned long changed;
3047 struct dirstat_dir dir;
3048
3049 if (data->nr == 0)
3050 return;
3051
3052 dir.files = NULL;
3053 dir.alloc = 0;
3054 dir.nr = 0;
3055 dir.permille = options->dirstat_permille;
3056 dir.cumulative = options->flags.dirstat_cumulative;
3057
3058 changed = 0;
3059 for (i = 0; i < data->nr; i++) {
3060 struct diffstat_file *file = data->files[i];
3061 unsigned long damage = file->added + file->deleted;
3062 if (file->is_binary)
3063 /*
3064 * binary files counts bytes, not lines. Must find some
3065 * way to normalize binary bytes vs. textual lines.
3066 * The following heuristic assumes that there are 64
3067 * bytes per "line".
3068 * This is stupid and ugly, but very cheap...
3069 */
3070 damage = DIV_ROUND_UP(damage, 64);
3071 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3072 dir.files[dir.nr].name = file->name;
3073 dir.files[dir.nr].changed = damage;
3074 changed += damage;
3075 dir.nr++;
3076 }
3077
3078 /* This can happen even with many files, if everything was renames */
3079 if (!changed)
3080 return;
3081
3082 /* Show all directories with more than x% of the changes */
3083 QSORT(dir.files, dir.nr, dirstat_compare);
3084 gather_dirstat(options, &dir, changed, "", 0);
3085 }
3086
3087 static void free_diffstat_info(struct diffstat_t *diffstat)
3088 {
3089 int i;
3090 for (i = 0; i < diffstat->nr; i++) {
3091 struct diffstat_file *f = diffstat->files[i];
3092 free(f->print_name);
3093 free(f->name);
3094 free(f->from_name);
3095 free(f);
3096 }
3097 free(diffstat->files);
3098 }
3099
3100 struct checkdiff_t {
3101 const char *filename;
3102 int lineno;
3103 int conflict_marker_size;
3104 struct diff_options *o;
3105 unsigned ws_rule;
3106 unsigned status;
3107 };
3108
3109 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3110 {
3111 char firstchar;
3112 int cnt;
3113
3114 if (len < marker_size + 1)
3115 return 0;
3116 firstchar = line[0];
3117 switch (firstchar) {
3118 case '=': case '>': case '<': case '|':
3119 break;
3120 default:
3121 return 0;
3122 }
3123 for (cnt = 1; cnt < marker_size; cnt++)
3124 if (line[cnt] != firstchar)
3125 return 0;
3126 /* line[1] thru line[marker_size-1] are same as firstchar */
3127 if (len < marker_size + 1 || !isspace(line[marker_size]))
3128 return 0;
3129 return 1;
3130 }
3131
3132 static void checkdiff_consume_hunk(void *priv,
3133 long ob, long on, long nb, long nn,
3134 const char *func, long funclen)
3135
3136 {
3137 struct checkdiff_t *data = priv;
3138 data->lineno = nb - 1;
3139 }
3140
3141 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3142 {
3143 struct checkdiff_t *data = priv;
3144 int marker_size = data->conflict_marker_size;
3145 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3146 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3147 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3148 char *err;
3149 const char *line_prefix;
3150
3151 assert(data->o);
3152 line_prefix = diff_line_prefix(data->o);
3153
3154 if (line[0] == '+') {
3155 unsigned bad;
3156 data->lineno++;
3157 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3158 data->status |= 1;
3159 fprintf(data->o->file,
3160 "%s%s:%d: leftover conflict marker\n",
3161 line_prefix, data->filename, data->lineno);
3162 }
3163 bad = ws_check(line + 1, len - 1, data->ws_rule);
3164 if (!bad)
3165 return;
3166 data->status |= bad;
3167 err = whitespace_error_string(bad);
3168 fprintf(data->o->file, "%s%s:%d: %s.\n",
3169 line_prefix, data->filename, data->lineno, err);
3170 free(err);
3171 emit_line(data->o, set, reset, line, 1);
3172 ws_check_emit(line + 1, len - 1, data->ws_rule,
3173 data->o->file, set, reset, ws);
3174 } else if (line[0] == ' ') {
3175 data->lineno++;
3176 }
3177 }
3178
3179 static unsigned char *deflate_it(char *data,
3180 unsigned long size,
3181 unsigned long *result_size)
3182 {
3183 int bound;
3184 unsigned char *deflated;
3185 git_zstream stream;
3186
3187 git_deflate_init(&stream, zlib_compression_level);
3188 bound = git_deflate_bound(&stream, size);
3189 deflated = xmalloc(bound);
3190 stream.next_out = deflated;
3191 stream.avail_out = bound;
3192
3193 stream.next_in = (unsigned char *)data;
3194 stream.avail_in = size;
3195 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3196 ; /* nothing */
3197 git_deflate_end(&stream);
3198 *result_size = stream.total_out;
3199 return deflated;
3200 }
3201
3202 static void emit_binary_diff_body(struct diff_options *o,
3203 mmfile_t *one, mmfile_t *two)
3204 {
3205 void *cp;
3206 void *delta;
3207 void *deflated;
3208 void *data;
3209 unsigned long orig_size;
3210 unsigned long delta_size;
3211 unsigned long deflate_size;
3212 unsigned long data_size;
3213
3214 /* We could do deflated delta, or we could do just deflated two,
3215 * whichever is smaller.
3216 */
3217 delta = NULL;
3218 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3219 if (one->size && two->size) {
3220 delta = diff_delta(one->ptr, one->size,
3221 two->ptr, two->size,
3222 &delta_size, deflate_size);
3223 if (delta) {
3224 void *to_free = delta;
3225 orig_size = delta_size;
3226 delta = deflate_it(delta, delta_size, &delta_size);
3227 free(to_free);
3228 }
3229 }
3230
3231 if (delta && delta_size < deflate_size) {
3232 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3233 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3234 s, strlen(s), 0);
3235 free(s);
3236 free(deflated);
3237 data = delta;
3238 data_size = delta_size;
3239 } else {
3240 char *s = xstrfmt("%lu", two->size);
3241 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3242 s, strlen(s), 0);
3243 free(s);
3244 free(delta);
3245 data = deflated;
3246 data_size = deflate_size;
3247 }
3248
3249 /* emit data encoded in base85 */
3250 cp = data;
3251 while (data_size) {
3252 int len;
3253 int bytes = (52 < data_size) ? 52 : data_size;
3254 char line[71];
3255 data_size -= bytes;
3256 if (bytes <= 26)
3257 line[0] = bytes + 'A' - 1;
3258 else
3259 line[0] = bytes - 26 + 'a' - 1;
3260 encode_85(line + 1, cp, bytes);
3261 cp = (char *) cp + bytes;
3262
3263 len = strlen(line);
3264 line[len++] = '\n';
3265 line[len] = '\0';
3266
3267 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3268 line, len, 0);
3269 }
3270 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3271 free(data);
3272 }
3273
3274 static void emit_binary_diff(struct diff_options *o,
3275 mmfile_t *one, mmfile_t *two)
3276 {
3277 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3278 emit_binary_diff_body(o, one, two);
3279 emit_binary_diff_body(o, two, one);
3280 }
3281
3282 int diff_filespec_is_binary(struct repository *r,
3283 struct diff_filespec *one)
3284 {
3285 if (one->is_binary == -1) {
3286 diff_filespec_load_driver(one, r->index);
3287 if (one->driver->binary != -1)
3288 one->is_binary = one->driver->binary;
3289 else {
3290 if (!one->data && DIFF_FILE_VALID(one))
3291 diff_populate_filespec(r, one, CHECK_BINARY);
3292 if (one->is_binary == -1 && one->data)
3293 one->is_binary = buffer_is_binary(one->data,
3294 one->size);
3295 if (one->is_binary == -1)
3296 one->is_binary = 0;
3297 }
3298 }
3299 return one->is_binary;
3300 }
3301
3302 static const struct userdiff_funcname *
3303 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3304 {
3305 diff_filespec_load_driver(one, o->repo->index);
3306 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3307 }
3308
3309 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3310 {
3311 if (!options->a_prefix)
3312 options->a_prefix = a;
3313 if (!options->b_prefix)
3314 options->b_prefix = b;
3315 }
3316
3317 struct userdiff_driver *get_textconv(struct repository *r,
3318 struct diff_filespec *one)
3319 {
3320 if (!DIFF_FILE_VALID(one))
3321 return NULL;
3322
3323 diff_filespec_load_driver(one, r->index);
3324 return userdiff_get_textconv(r, one->driver);
3325 }
3326
3327 static void builtin_diff(const char *name_a,
3328 const char *name_b,
3329 struct diff_filespec *one,
3330 struct diff_filespec *two,
3331 const char *xfrm_msg,
3332 int must_show_header,
3333 struct diff_options *o,
3334 int complete_rewrite)
3335 {
3336 mmfile_t mf1, mf2;
3337 const char *lbl[2];
3338 char *a_one, *b_two;
3339 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3340 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3341 const char *a_prefix, *b_prefix;
3342 struct userdiff_driver *textconv_one = NULL;
3343 struct userdiff_driver *textconv_two = NULL;
3344 struct strbuf header = STRBUF_INIT;
3345 const char *line_prefix = diff_line_prefix(o);
3346
3347 diff_set_mnemonic_prefix(o, "a/", "b/");
3348 if (o->flags.reverse_diff) {
3349 a_prefix = o->b_prefix;
3350 b_prefix = o->a_prefix;
3351 } else {
3352 a_prefix = o->a_prefix;
3353 b_prefix = o->b_prefix;
3354 }
3355
3356 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3357 (!one->mode || S_ISGITLINK(one->mode)) &&
3358 (!two->mode || S_ISGITLINK(two->mode))) {
3359 show_submodule_summary(o, one->path ? one->path : two->path,
3360 &one->oid, &two->oid,
3361 two->dirty_submodule);
3362 return;
3363 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3364 (!one->mode || S_ISGITLINK(one->mode)) &&
3365 (!two->mode || S_ISGITLINK(two->mode))) {
3366 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3367 &one->oid, &two->oid,
3368 two->dirty_submodule);
3369 return;
3370 }
3371
3372 if (o->flags.allow_textconv) {
3373 textconv_one = get_textconv(o->repo, one);
3374 textconv_two = get_textconv(o->repo, two);
3375 }
3376
3377 /* Never use a non-valid filename anywhere if at all possible */
3378 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3379 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3380
3381 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3382 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3383 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3384 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3385 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3386 if (lbl[0][0] == '/') {
3387 /* /dev/null */
3388 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3389 if (xfrm_msg)
3390 strbuf_addstr(&header, xfrm_msg);
3391 must_show_header = 1;
3392 }
3393 else if (lbl[1][0] == '/') {
3394 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3395 if (xfrm_msg)
3396 strbuf_addstr(&header, xfrm_msg);
3397 must_show_header = 1;
3398 }
3399 else {
3400 if (one->mode != two->mode) {
3401 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3402 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3403 must_show_header = 1;
3404 }
3405 if (xfrm_msg)
3406 strbuf_addstr(&header, xfrm_msg);
3407
3408 /*
3409 * we do not run diff between different kind
3410 * of objects.
3411 */
3412 if ((one->mode ^ two->mode) & S_IFMT)
3413 goto free_ab_and_return;
3414 if (complete_rewrite &&
3415 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3416 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3417 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3418 header.buf, header.len, 0);
3419 strbuf_reset(&header);
3420 emit_rewrite_diff(name_a, name_b, one, two,
3421 textconv_one, textconv_two, o);
3422 o->found_changes = 1;
3423 goto free_ab_and_return;
3424 }
3425 }
3426
3427 if (o->irreversible_delete && lbl[1][0] == '/') {
3428 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3429 header.len, 0);
3430 strbuf_reset(&header);
3431 goto free_ab_and_return;
3432 } else if (!o->flags.text &&
3433 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3434 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3435 struct strbuf sb = STRBUF_INIT;
3436 if (!one->data && !two->data &&
3437 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3438 !o->flags.binary) {
3439 if (oideq(&one->oid, &two->oid)) {
3440 if (must_show_header)
3441 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3442 header.buf, header.len,
3443 0);
3444 goto free_ab_and_return;
3445 }
3446 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3447 header.buf, header.len, 0);
3448 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3449 diff_line_prefix(o), lbl[0], lbl[1]);
3450 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3451 sb.buf, sb.len, 0);
3452 strbuf_release(&sb);
3453 goto free_ab_and_return;
3454 }
3455 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3456 fill_mmfile(o->repo, &mf2, two) < 0)
3457 die("unable to read files to diff");
3458 /* Quite common confusing case */
3459 if (mf1.size == mf2.size &&
3460 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3461 if (must_show_header)
3462 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3463 header.buf, header.len, 0);
3464 goto free_ab_and_return;
3465 }
3466 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3467 strbuf_reset(&header);
3468 if (o->flags.binary)
3469 emit_binary_diff(o, &mf1, &mf2);
3470 else {
3471 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3472 diff_line_prefix(o), lbl[0], lbl[1]);
3473 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3474 sb.buf, sb.len, 0);
3475 strbuf_release(&sb);
3476 }
3477 o->found_changes = 1;
3478 } else {
3479 /* Crazy xdl interfaces.. */
3480 const char *diffopts = getenv("GIT_DIFF_OPTS");
3481 const char *v;
3482 xpparam_t xpp;
3483 xdemitconf_t xecfg;
3484 struct emit_callback ecbdata;
3485 const struct userdiff_funcname *pe;
3486
3487 if (must_show_header) {
3488 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3489 header.buf, header.len, 0);
3490 strbuf_reset(&header);
3491 }
3492
3493 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3494 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3495
3496 pe = diff_funcname_pattern(o, one);
3497 if (!pe)
3498 pe = diff_funcname_pattern(o, two);
3499
3500 memset(&xpp, 0, sizeof(xpp));
3501 memset(&xecfg, 0, sizeof(xecfg));
3502 memset(&ecbdata, 0, sizeof(ecbdata));
3503 if (o->flags.suppress_diff_headers)
3504 lbl[0] = NULL;
3505 ecbdata.label_path = lbl;
3506 ecbdata.color_diff = want_color(o->use_color);
3507 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3508 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3509 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3510 ecbdata.opt = o;
3511 if (header.len && !o->flags.suppress_diff_headers)
3512 ecbdata.header = &header;
3513 xpp.flags = o->xdl_opts;
3514 xpp.anchors = o->anchors;
3515 xpp.anchors_nr = o->anchors_nr;
3516 xecfg.ctxlen = o->context;
3517 xecfg.interhunkctxlen = o->interhunkcontext;
3518 xecfg.flags = XDL_EMIT_FUNCNAMES;
3519 if (o->flags.funccontext)
3520 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3521 if (pe)
3522 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3523 if (!diffopts)
3524 ;
3525 else if (skip_prefix(diffopts, "--unified=", &v))
3526 xecfg.ctxlen = strtoul(v, NULL, 10);
3527 else if (skip_prefix(diffopts, "-u", &v))
3528 xecfg.ctxlen = strtoul(v, NULL, 10);
3529 if (o->word_diff)
3530 init_diff_words_data(&ecbdata, o, one, two);
3531 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3532 &ecbdata, &xpp, &xecfg))
3533 die("unable to generate diff for %s", one->path);
3534 if (o->word_diff)
3535 free_diff_words_data(&ecbdata);
3536 if (textconv_one)
3537 free(mf1.ptr);
3538 if (textconv_two)
3539 free(mf2.ptr);
3540 xdiff_clear_find_func(&xecfg);
3541 }
3542
3543 free_ab_and_return:
3544 strbuf_release(&header);
3545 diff_free_filespec_data(one);
3546 diff_free_filespec_data(two);
3547 free(a_one);
3548 free(b_two);
3549 return;
3550 }
3551
3552 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3553 {
3554 if (!is_renamed) {
3555 if (p->status == DIFF_STATUS_ADDED) {
3556 if (S_ISLNK(p->two->mode))
3557 return "new +l";
3558 else if ((p->two->mode & 0777) == 0755)
3559 return "new +x";
3560 else
3561 return "new";
3562 } else if (p->status == DIFF_STATUS_DELETED)
3563 return "gone";
3564 }
3565 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3566 return "mode -l";
3567 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3568 return "mode +l";
3569 else if ((p->one->mode & 0777) == 0644 &&
3570 (p->two->mode & 0777) == 0755)
3571 return "mode +x";
3572 else if ((p->one->mode & 0777) == 0755 &&
3573 (p->two->mode & 0777) == 0644)
3574 return "mode -x";
3575 return NULL;
3576 }
3577
3578 static void builtin_diffstat(const char *name_a, const char *name_b,
3579 struct diff_filespec *one,
3580 struct diff_filespec *two,
3581 struct diffstat_t *diffstat,
3582 struct diff_options *o,
3583 struct diff_filepair *p)
3584 {
3585 mmfile_t mf1, mf2;
3586 struct diffstat_file *data;
3587 int same_contents;
3588 int complete_rewrite = 0;
3589
3590 if (!DIFF_PAIR_UNMERGED(p)) {
3591 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3592 complete_rewrite = 1;
3593 }
3594
3595 data = diffstat_add(diffstat, name_a, name_b);
3596 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3597 if (o->flags.stat_with_summary)
3598 data->comments = get_compact_summary(p, data->is_renamed);
3599
3600 if (!one || !two) {
3601 data->is_unmerged = 1;
3602 return;
3603 }
3604
3605 same_contents = oideq(&one->oid, &two->oid);
3606
3607 if (diff_filespec_is_binary(o->repo, one) ||
3608 diff_filespec_is_binary(o->repo, two)) {
3609 data->is_binary = 1;
3610 if (same_contents) {
3611 data->added = 0;
3612 data->deleted = 0;
3613 } else {
3614 data->added = diff_filespec_size(o->repo, two);
3615 data->deleted = diff_filespec_size(o->repo, one);
3616 }
3617 }
3618
3619 else if (complete_rewrite) {
3620 diff_populate_filespec(o->repo, one, 0);
3621 diff_populate_filespec(o->repo, two, 0);
3622 data->deleted = count_lines(one->data, one->size);
3623 data->added = count_lines(two->data, two->size);
3624 }
3625
3626 else if (!same_contents) {
3627 /* Crazy xdl interfaces.. */
3628 xpparam_t xpp;
3629 xdemitconf_t xecfg;
3630
3631 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3632 fill_mmfile(o->repo, &mf2, two) < 0)
3633 die("unable to read files to diff");
3634
3635 memset(&xpp, 0, sizeof(xpp));
3636 memset(&xecfg, 0, sizeof(xecfg));
3637 xpp.flags = o->xdl_opts;
3638 xpp.anchors = o->anchors;
3639 xpp.anchors_nr = o->anchors_nr;
3640 xecfg.ctxlen = o->context;
3641 xecfg.interhunkctxlen = o->interhunkcontext;
3642 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
3643 diffstat_consume, diffstat, &xpp, &xecfg))
3644 die("unable to generate diffstat for %s", one->path);
3645 }
3646
3647 diff_free_filespec_data(one);
3648 diff_free_filespec_data(two);
3649 }
3650
3651 static void builtin_checkdiff(const char *name_a, const char *name_b,
3652 const char *attr_path,
3653 struct diff_filespec *one,
3654 struct diff_filespec *two,
3655 struct diff_options *o)
3656 {
3657 mmfile_t mf1, mf2;
3658 struct checkdiff_t data;
3659
3660 if (!two)
3661 return;
3662
3663 memset(&data, 0, sizeof(data));
3664 data.filename = name_b ? name_b : name_a;
3665 data.lineno = 0;
3666 data.o = o;
3667 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3668 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3669
3670 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3671 fill_mmfile(o->repo, &mf2, two) < 0)
3672 die("unable to read files to diff");
3673
3674 /*
3675 * All the other codepaths check both sides, but not checking
3676 * the "old" side here is deliberate. We are checking the newly
3677 * introduced changes, and as long as the "new" side is text, we
3678 * can and should check what it introduces.
3679 */
3680 if (diff_filespec_is_binary(o->repo, two))
3681 goto free_and_return;
3682 else {
3683 /* Crazy xdl interfaces.. */
3684 xpparam_t xpp;
3685 xdemitconf_t xecfg;
3686
3687 memset(&xpp, 0, sizeof(xpp));
3688 memset(&xecfg, 0, sizeof(xecfg));
3689 xecfg.ctxlen = 1; /* at least one context line */
3690 xpp.flags = 0;
3691 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3692 checkdiff_consume, &data,
3693 &xpp, &xecfg))
3694 die("unable to generate checkdiff for %s", one->path);
3695
3696 if (data.ws_rule & WS_BLANK_AT_EOF) {
3697 struct emit_callback ecbdata;
3698 int blank_at_eof;
3699
3700 ecbdata.ws_rule = data.ws_rule;
3701 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3702 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3703
3704 if (blank_at_eof) {
3705 static char *err;
3706 if (!err)
3707 err = whitespace_error_string(WS_BLANK_AT_EOF);
3708 fprintf(o->file, "%s:%d: %s.\n",
3709 data.filename, blank_at_eof, err);
3710 data.status = 1; /* report errors */
3711 }
3712 }
3713 }
3714 free_and_return:
3715 diff_free_filespec_data(one);
3716 diff_free_filespec_data(two);
3717 if (data.status)
3718 o->flags.check_failed = 1;
3719 }
3720
3721 struct diff_filespec *alloc_filespec(const char *path)
3722 {
3723 struct diff_filespec *spec;
3724
3725 FLEXPTR_ALLOC_STR(spec, path, path);
3726 spec->count = 1;
3727 spec->is_binary = -1;
3728 return spec;
3729 }
3730
3731 void free_filespec(struct diff_filespec *spec)
3732 {
3733 if (!--spec->count) {
3734 diff_free_filespec_data(spec);
3735 free(spec);
3736 }
3737 }
3738
3739 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3740 int oid_valid, unsigned short mode)
3741 {
3742 if (mode) {
3743 spec->mode = canon_mode(mode);
3744 oidcpy(&spec->oid, oid);
3745 spec->oid_valid = oid_valid;
3746 }
3747 }
3748
3749 /*
3750 * Given a name and sha1 pair, if the index tells us the file in
3751 * the work tree has that object contents, return true, so that
3752 * prepare_temp_file() does not have to inflate and extract.
3753 */
3754 static int reuse_worktree_file(struct index_state *istate,
3755 const char *name,
3756 const struct object_id *oid,
3757 int want_file)
3758 {
3759 const struct cache_entry *ce;
3760 struct stat st;
3761 int pos, len;
3762
3763 /*
3764 * We do not read the cache ourselves here, because the
3765 * benchmark with my previous version that always reads cache
3766 * shows that it makes things worse for diff-tree comparing
3767 * two linux-2.6 kernel trees in an already checked out work
3768 * tree. This is because most diff-tree comparisons deal with
3769 * only a small number of files, while reading the cache is
3770 * expensive for a large project, and its cost outweighs the
3771 * savings we get by not inflating the object to a temporary
3772 * file. Practically, this code only helps when we are used
3773 * by diff-cache --cached, which does read the cache before
3774 * calling us.
3775 */
3776 if (!istate->cache)
3777 return 0;
3778
3779 /* We want to avoid the working directory if our caller
3780 * doesn't need the data in a normal file, this system
3781 * is rather slow with its stat/open/mmap/close syscalls,
3782 * and the object is contained in a pack file. The pack
3783 * is probably already open and will be faster to obtain
3784 * the data through than the working directory. Loose
3785 * objects however would tend to be slower as they need
3786 * to be individually opened and inflated.
3787 */
3788 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3789 return 0;
3790
3791 /*
3792 * Similarly, if we'd have to convert the file contents anyway, that
3793 * makes the optimization not worthwhile.
3794 */
3795 if (!want_file && would_convert_to_git(istate, name))
3796 return 0;
3797
3798 len = strlen(name);
3799 pos = index_name_pos(istate, name, len);
3800 if (pos < 0)
3801 return 0;
3802 ce = istate->cache[pos];
3803
3804 /*
3805 * This is not the sha1 we are looking for, or
3806 * unreusable because it is not a regular file.
3807 */
3808 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3809 return 0;
3810
3811 /*
3812 * If ce is marked as "assume unchanged", there is no
3813 * guarantee that work tree matches what we are looking for.
3814 */
3815 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3816 return 0;
3817
3818 /*
3819 * If ce matches the file in the work tree, we can reuse it.
3820 */
3821 if (ce_uptodate(ce) ||
3822 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3823 return 1;
3824
3825 return 0;
3826 }
3827
3828 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3829 {
3830 struct strbuf buf = STRBUF_INIT;
3831 char *dirty = "";
3832
3833 /* Are we looking at the work tree? */
3834 if (s->dirty_submodule)
3835 dirty = "-dirty";
3836
3837 strbuf_addf(&buf, "Subproject commit %s%s\n",
3838 oid_to_hex(&s->oid), dirty);
3839 s->size = buf.len;
3840 if (size_only) {
3841 s->data = NULL;
3842 strbuf_release(&buf);
3843 } else {
3844 s->data = strbuf_detach(&buf, NULL);
3845 s->should_free = 1;
3846 }
3847 return 0;
3848 }
3849
3850 /*
3851 * While doing rename detection and pickaxe operation, we may need to
3852 * grab the data for the blob (or file) for our own in-core comparison.
3853 * diff_filespec has data and size fields for this purpose.
3854 */
3855 int diff_populate_filespec(struct repository *r,
3856 struct diff_filespec *s,
3857 unsigned int flags)
3858 {
3859 int size_only = flags & CHECK_SIZE_ONLY;
3860 int err = 0;
3861 int conv_flags = global_conv_flags_eol;
3862 /*
3863 * demote FAIL to WARN to allow inspecting the situation
3864 * instead of refusing.
3865 */
3866 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3867 conv_flags = CONV_EOL_RNDTRP_WARN;
3868
3869 if (!DIFF_FILE_VALID(s))
3870 die("internal error: asking to populate invalid file.");
3871 if (S_ISDIR(s->mode))
3872 return -1;
3873
3874 if (s->data)
3875 return 0;
3876
3877 if (size_only && 0 < s->size)
3878 return 0;
3879
3880 if (S_ISGITLINK(s->mode))
3881 return diff_populate_gitlink(s, size_only);
3882
3883 if (!s->oid_valid ||
3884 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3885 struct strbuf buf = STRBUF_INIT;
3886 struct stat st;
3887 int fd;
3888
3889 if (lstat(s->path, &st) < 0) {
3890 err_empty:
3891 err = -1;
3892 empty:
3893 s->data = (char *)"";
3894 s->size = 0;
3895 return err;
3896 }
3897 s->size = xsize_t(st.st_size);
3898 if (!s->size)
3899 goto empty;
3900 if (S_ISLNK(st.st_mode)) {
3901 struct strbuf sb = STRBUF_INIT;
3902
3903 if (strbuf_readlink(&sb, s->path, s->size))
3904 goto err_empty;
3905 s->size = sb.len;
3906 s->data = strbuf_detach(&sb, NULL);
3907 s->should_free = 1;
3908 return 0;
3909 }
3910
3911 /*
3912 * Even if the caller would be happy with getting
3913 * only the size, we cannot return early at this
3914 * point if the path requires us to run the content
3915 * conversion.
3916 */
3917 if (size_only && !would_convert_to_git(r->index, s->path))
3918 return 0;
3919
3920 /*
3921 * Note: this check uses xsize_t(st.st_size) that may
3922 * not be the true size of the blob after it goes
3923 * through convert_to_git(). This may not strictly be
3924 * correct, but the whole point of big_file_threshold
3925 * and is_binary check being that we want to avoid
3926 * opening the file and inspecting the contents, this
3927 * is probably fine.
3928 */
3929 if ((flags & CHECK_BINARY) &&
3930 s->size > big_file_threshold && s->is_binary == -1) {
3931 s->is_binary = 1;
3932 return 0;
3933 }
3934 fd = open(s->path, O_RDONLY);
3935 if (fd < 0)
3936 goto err_empty;
3937 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3938 close(fd);
3939 s->should_munmap = 1;
3940
3941 /*
3942 * Convert from working tree format to canonical git format
3943 */
3944 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
3945 size_t size = 0;
3946 munmap(s->data, s->size);
3947 s->should_munmap = 0;
3948 s->data = strbuf_detach(&buf, &size);
3949 s->size = size;
3950 s->should_free = 1;
3951 }
3952 }
3953 else {
3954 enum object_type type;
3955 if (size_only || (flags & CHECK_BINARY)) {
3956 type = oid_object_info(r, &s->oid, &s->size);
3957 if (type < 0)
3958 die("unable to read %s",
3959 oid_to_hex(&s->oid));
3960 if (size_only)
3961 return 0;
3962 if (s->size > big_file_threshold && s->is_binary == -1) {
3963 s->is_binary = 1;
3964 return 0;
3965 }
3966 }
3967 s->data = read_object_file(&s->oid, &type, &s->size);
3968 if (!s->data)
3969 die("unable to read %s", oid_to_hex(&s->oid));
3970 s->should_free = 1;
3971 }
3972 return 0;
3973 }
3974
3975 void diff_free_filespec_blob(struct diff_filespec *s)
3976 {
3977 if (s->should_free)
3978 free(s->data);
3979 else if (s->should_munmap)
3980 munmap(s->data, s->size);
3981
3982 if (s->should_free || s->should_munmap) {
3983 s->should_free = s->should_munmap = 0;
3984 s->data = NULL;
3985 }
3986 }
3987
3988 void diff_free_filespec_data(struct diff_filespec *s)
3989 {
3990 diff_free_filespec_blob(s);
3991 FREE_AND_NULL(s->cnt_data);
3992 }
3993
3994 static void prep_temp_blob(struct index_state *istate,
3995 const char *path, struct diff_tempfile *temp,
3996 void *blob,
3997 unsigned long size,
3998 const struct object_id *oid,
3999 int mode)
4000 {
4001 struct strbuf buf = STRBUF_INIT;
4002 struct strbuf tempfile = STRBUF_INIT;
4003 char *path_dup = xstrdup(path);
4004 const char *base = basename(path_dup);
4005
4006 /* Generate "XXXXXX_basename.ext" */
4007 strbuf_addstr(&tempfile, "XXXXXX_");
4008 strbuf_addstr(&tempfile, base);
4009
4010 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4011 if (!temp->tempfile)
4012 die_errno("unable to create temp-file");
4013 if (convert_to_working_tree(istate, path,
4014 (const char *)blob, (size_t)size, &buf)) {
4015 blob = buf.buf;
4016 size = buf.len;
4017 }
4018 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4019 close_tempfile_gently(temp->tempfile))
4020 die_errno("unable to write temp-file");
4021 temp->name = get_tempfile_path(temp->tempfile);
4022 oid_to_hex_r(temp->hex, oid);
4023 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4024 strbuf_release(&buf);
4025 strbuf_release(&tempfile);
4026 free(path_dup);
4027 }
4028
4029 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4030 const char *name,
4031 struct diff_filespec *one)
4032 {
4033 struct diff_tempfile *temp = claim_diff_tempfile();
4034
4035 if (!DIFF_FILE_VALID(one)) {
4036 not_a_valid_file:
4037 /* A '-' entry produces this for file-2, and
4038 * a '+' entry produces this for file-1.
4039 */
4040 temp->name = "/dev/null";
4041 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4042 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4043 return temp;
4044 }
4045
4046 if (!S_ISGITLINK(one->mode) &&
4047 (!one->oid_valid ||
4048 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4049 struct stat st;
4050 if (lstat(name, &st) < 0) {
4051 if (errno == ENOENT)
4052 goto not_a_valid_file;
4053 die_errno("stat(%s)", name);
4054 }
4055 if (S_ISLNK(st.st_mode)) {
4056 struct strbuf sb = STRBUF_INIT;
4057 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4058 die_errno("readlink(%s)", name);
4059 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4060 (one->oid_valid ?
4061 &one->oid : &null_oid),
4062 (one->oid_valid ?
4063 one->mode : S_IFLNK));
4064 strbuf_release(&sb);
4065 }
4066 else {
4067 /* we can borrow from the file in the work tree */
4068 temp->name = name;
4069 if (!one->oid_valid)
4070 oid_to_hex_r(temp->hex, &null_oid);
4071 else
4072 oid_to_hex_r(temp->hex, &one->oid);
4073 /* Even though we may sometimes borrow the
4074 * contents from the work tree, we always want
4075 * one->mode. mode is trustworthy even when
4076 * !(one->oid_valid), as long as
4077 * DIFF_FILE_VALID(one).
4078 */
4079 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4080 }
4081 return temp;
4082 }
4083 else {
4084 if (diff_populate_filespec(r, one, 0))
4085 die("cannot read data blob for %s", one->path);
4086 prep_temp_blob(r->index, name, temp,
4087 one->data, one->size,
4088 &one->oid, one->mode);
4089 }
4090 return temp;
4091 }
4092
4093 static void add_external_diff_name(struct repository *r,
4094 struct argv_array *argv,
4095 const char *name,
4096 struct diff_filespec *df)
4097 {
4098 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4099 argv_array_push(argv, temp->name);
4100 argv_array_push(argv, temp->hex);
4101 argv_array_push(argv, temp->mode);
4102 }
4103
4104 /* An external diff command takes:
4105 *
4106 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4107 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4108 *
4109 */
4110 static void run_external_diff(const char *pgm,
4111 const char *name,
4112 const char *other,
4113 struct diff_filespec *one,
4114 struct diff_filespec *two,
4115 const char *xfrm_msg,
4116 int complete_rewrite,
4117 struct diff_options *o)
4118 {
4119 struct argv_array argv = ARGV_ARRAY_INIT;
4120 struct argv_array env = ARGV_ARRAY_INIT;
4121 struct diff_queue_struct *q = &diff_queued_diff;
4122
4123 argv_array_push(&argv, pgm);
4124 argv_array_push(&argv, name);
4125
4126 if (one && two) {
4127 add_external_diff_name(o->repo, &argv, name, one);
4128 if (!other)
4129 add_external_diff_name(o->repo, &argv, name, two);
4130 else {
4131 add_external_diff_name(o->repo, &argv, other, two);
4132 argv_array_push(&argv, other);
4133 argv_array_push(&argv, xfrm_msg);
4134 }
4135 }
4136
4137 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4138 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4139
4140 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4141 die(_("external diff died, stopping at %s"), name);
4142
4143 remove_tempfile();
4144 argv_array_clear(&argv);
4145 argv_array_clear(&env);
4146 }
4147
4148 static int similarity_index(struct diff_filepair *p)
4149 {
4150 return p->score * 100 / MAX_SCORE;
4151 }
4152
4153 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4154 {
4155 if (startup_info->have_repository)
4156 return find_unique_abbrev(oid, abbrev);
4157 else {
4158 char *hex = oid_to_hex(oid);
4159 if (abbrev < 0)
4160 abbrev = FALLBACK_DEFAULT_ABBREV;
4161 if (abbrev > the_hash_algo->hexsz)
4162 BUG("oid abbreviation out of range: %d", abbrev);
4163 if (abbrev)
4164 hex[abbrev] = '\0';
4165 return hex;
4166 }
4167 }
4168
4169 static void fill_metainfo(struct strbuf *msg,
4170 const char *name,
4171 const char *other,
4172 struct diff_filespec *one,
4173 struct diff_filespec *two,
4174 struct diff_options *o,
4175 struct diff_filepair *p,
4176 int *must_show_header,
4177 int use_color)
4178 {
4179 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4180 const char *reset = diff_get_color(use_color, DIFF_RESET);
4181 const char *line_prefix = diff_line_prefix(o);
4182
4183 *must_show_header = 1;
4184 strbuf_init(msg, PATH_MAX * 2 + 300);
4185 switch (p->status) {
4186 case DIFF_STATUS_COPIED:
4187 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4188 line_prefix, set, similarity_index(p));
4189 strbuf_addf(msg, "%s\n%s%scopy from ",
4190 reset, line_prefix, set);
4191 quote_c_style(name, msg, NULL, 0);
4192 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4193 quote_c_style(other, msg, NULL, 0);
4194 strbuf_addf(msg, "%s\n", reset);
4195 break;
4196 case DIFF_STATUS_RENAMED:
4197 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4198 line_prefix, set, similarity_index(p));
4199 strbuf_addf(msg, "%s\n%s%srename from ",
4200 reset, line_prefix, set);
4201 quote_c_style(name, msg, NULL, 0);
4202 strbuf_addf(msg, "%s\n%s%srename to ",
4203 reset, line_prefix, set);
4204 quote_c_style(other, msg, NULL, 0);
4205 strbuf_addf(msg, "%s\n", reset);
4206 break;
4207 case DIFF_STATUS_MODIFIED:
4208 if (p->score) {
4209 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4210 line_prefix,
4211 set, similarity_index(p), reset);
4212 break;
4213 }
4214 /* fallthru */
4215 default:
4216 *must_show_header = 0;
4217 }
4218 if (one && two && !oideq(&one->oid, &two->oid)) {
4219 const unsigned hexsz = the_hash_algo->hexsz;
4220 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4221
4222 if (o->flags.binary) {
4223 mmfile_t mf;
4224 if ((!fill_mmfile(o->repo, &mf, one) &&
4225 diff_filespec_is_binary(o->repo, one)) ||
4226 (!fill_mmfile(o->repo, &mf, two) &&
4227 diff_filespec_is_binary(o->repo, two)))
4228 abbrev = hexsz;
4229 }
4230 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4231 diff_abbrev_oid(&one->oid, abbrev),
4232 diff_abbrev_oid(&two->oid, abbrev));
4233 if (one->mode == two->mode)
4234 strbuf_addf(msg, " %06o", one->mode);
4235 strbuf_addf(msg, "%s\n", reset);
4236 }
4237 }
4238
4239 static void run_diff_cmd(const char *pgm,
4240 const char *name,
4241 const char *other,
4242 const char *attr_path,
4243 struct diff_filespec *one,
4244 struct diff_filespec *two,
4245 struct strbuf *msg,
4246 struct diff_options *o,
4247 struct diff_filepair *p)
4248 {
4249 const char *xfrm_msg = NULL;
4250 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4251 int must_show_header = 0;
4252
4253
4254 if (o->flags.allow_external) {
4255 struct userdiff_driver *drv;
4256
4257 drv = userdiff_find_by_path(o->repo->index, attr_path);
4258 if (drv && drv->external)
4259 pgm = drv->external;
4260 }
4261
4262 if (msg) {
4263 /*
4264 * don't use colors when the header is intended for an
4265 * external diff driver
4266 */
4267 fill_metainfo(msg, name, other, one, two, o, p,
4268 &must_show_header,
4269 want_color(o->use_color) && !pgm);
4270 xfrm_msg = msg->len ? msg->buf : NULL;
4271 }
4272
4273 if (pgm) {
4274 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4275 complete_rewrite, o);
4276 return;
4277 }
4278 if (one && two)
4279 builtin_diff(name, other ? other : name,
4280 one, two, xfrm_msg, must_show_header,
4281 o, complete_rewrite);
4282 else
4283 fprintf(o->file, "* Unmerged path %s\n", name);
4284 }
4285
4286 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4287 {
4288 if (DIFF_FILE_VALID(one)) {
4289 if (!one->oid_valid) {
4290 struct stat st;
4291 if (one->is_stdin) {
4292 oidclr(&one->oid);
4293 return;
4294 }
4295 if (lstat(one->path, &st) < 0)
4296 die_errno("stat '%s'", one->path);
4297 if (index_path(istate, &one->oid, one->path, &st, 0))
4298 die("cannot hash %s", one->path);
4299 }
4300 }
4301 else
4302 oidclr(&one->oid);
4303 }
4304
4305 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4306 {
4307 /* Strip the prefix but do not molest /dev/null and absolute paths */
4308 if (*namep && !is_absolute_path(*namep)) {
4309 *namep += prefix_length;
4310 if (**namep == '/')
4311 ++*namep;
4312 }
4313 if (*otherp && !is_absolute_path(*otherp)) {
4314 *otherp += prefix_length;
4315 if (**otherp == '/')
4316 ++*otherp;
4317 }
4318 }
4319
4320 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4321 {
4322 const char *pgm = external_diff();
4323 struct strbuf msg;
4324 struct diff_filespec *one = p->one;
4325 struct diff_filespec *two = p->two;
4326 const char *name;
4327 const char *other;
4328 const char *attr_path;
4329
4330 name = one->path;
4331 other = (strcmp(name, two->path) ? two->path : NULL);
4332 attr_path = name;
4333 if (o->prefix_length)
4334 strip_prefix(o->prefix_length, &name, &other);
4335
4336 if (!o->flags.allow_external)
4337 pgm = NULL;
4338
4339 if (DIFF_PAIR_UNMERGED(p)) {
4340 run_diff_cmd(pgm, name, NULL, attr_path,
4341 NULL, NULL, NULL, o, p);
4342 return;
4343 }
4344
4345 diff_fill_oid_info(one, o->repo->index);
4346 diff_fill_oid_info(two, o->repo->index);
4347
4348 if (!pgm &&
4349 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4350 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4351 /*
4352 * a filepair that changes between file and symlink
4353 * needs to be split into deletion and creation.
4354 */
4355 struct diff_filespec *null = alloc_filespec(two->path);
4356 run_diff_cmd(NULL, name, other, attr_path,
4357 one, null, &msg,
4358 o, p);
4359 free(null);
4360 strbuf_release(&msg);
4361
4362 null = alloc_filespec(one->path);
4363 run_diff_cmd(NULL, name, other, attr_path,
4364 null, two, &msg, o, p);
4365 free(null);
4366 }
4367 else
4368 run_diff_cmd(pgm, name, other, attr_path,
4369 one, two, &msg, o, p);
4370
4371 strbuf_release(&msg);
4372 }
4373
4374 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4375 struct diffstat_t *diffstat)
4376 {
4377 const char *name;
4378 const char *other;
4379
4380 if (DIFF_PAIR_UNMERGED(p)) {
4381 /* unmerged */
4382 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4383 diffstat, o, p);
4384 return;
4385 }
4386
4387 name = p->one->path;
4388 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4389
4390 if (o->prefix_length)
4391 strip_prefix(o->prefix_length, &name, &other);
4392
4393 diff_fill_oid_info(p->one, o->repo->index);
4394 diff_fill_oid_info(p->two, o->repo->index);
4395
4396 builtin_diffstat(name, other, p->one, p->two,
4397 diffstat, o, p);
4398 }
4399
4400 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4401 {
4402 const char *name;
4403 const char *other;
4404 const char *attr_path;
4405
4406 if (DIFF_PAIR_UNMERGED(p)) {
4407 /* unmerged */
4408 return;
4409 }
4410
4411 name = p->one->path;
4412 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4413 attr_path = other ? other : name;
4414
4415 if (o->prefix_length)
4416 strip_prefix(o->prefix_length, &name, &other);
4417
4418 diff_fill_oid_info(p->one, o->repo->index);
4419 diff_fill_oid_info(p->two, o->repo->index);
4420
4421 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4422 }
4423
4424 static void prep_parse_options(struct diff_options *options);
4425
4426 void repo_diff_setup(struct repository *r, struct diff_options *options)
4427 {
4428 memcpy(options, &default_diff_options, sizeof(*options));
4429
4430 options->file = stdout;
4431 options->repo = r;
4432
4433 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4434 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4435 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4436 options->abbrev = DEFAULT_ABBREV;
4437 options->line_termination = '\n';
4438 options->break_opt = -1;
4439 options->rename_limit = -1;
4440 options->dirstat_permille = diff_dirstat_permille_default;
4441 options->context = diff_context_default;
4442 options->interhunkcontext = diff_interhunk_context_default;
4443 options->ws_error_highlight = ws_error_highlight_default;
4444 options->flags.rename_empty = 1;
4445 options->objfind = NULL;
4446
4447 /* pathchange left =NULL by default */
4448 options->change = diff_change;
4449 options->add_remove = diff_addremove;
4450 options->use_color = diff_use_color_default;
4451 options->detect_rename = diff_detect_rename_default;
4452 options->xdl_opts |= diff_algorithm;
4453 if (diff_indent_heuristic)
4454 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4455
4456 options->orderfile = diff_order_file_cfg;
4457
4458 if (diff_no_prefix) {
4459 options->a_prefix = options->b_prefix = "";
4460 } else if (!diff_mnemonic_prefix) {
4461 options->a_prefix = "a/";
4462 options->b_prefix = "b/";
4463 }
4464
4465 options->color_moved = diff_color_moved_default;
4466 options->color_moved_ws_handling = diff_color_moved_ws_default;
4467
4468 prep_parse_options(options);
4469 }
4470
4471 void diff_setup_done(struct diff_options *options)
4472 {
4473 unsigned check_mask = DIFF_FORMAT_NAME |
4474 DIFF_FORMAT_NAME_STATUS |
4475 DIFF_FORMAT_CHECKDIFF |
4476 DIFF_FORMAT_NO_OUTPUT;
4477 /*
4478 * This must be signed because we're comparing against a potentially
4479 * negative value.
4480 */
4481 const int hexsz = the_hash_algo->hexsz;
4482
4483 if (options->set_default)
4484 options->set_default(options);
4485
4486 if (HAS_MULTI_BITS(options->output_format & check_mask))
4487 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4488
4489 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4490 die(_("-G, -S and --find-object are mutually exclusive"));
4491
4492 /*
4493 * Most of the time we can say "there are changes"
4494 * only by checking if there are changed paths, but
4495 * --ignore-whitespace* options force us to look
4496 * inside contents.
4497 */
4498
4499 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4500 options->flags.diff_from_contents = 1;
4501 else
4502 options->flags.diff_from_contents = 0;
4503
4504 if (options->flags.find_copies_harder)
4505 options->detect_rename = DIFF_DETECT_COPY;
4506
4507 if (!options->flags.relative_name)
4508 options->prefix = NULL;
4509 if (options->prefix)
4510 options->prefix_length = strlen(options->prefix);
4511 else
4512 options->prefix_length = 0;
4513
4514 if (options->output_format & (DIFF_FORMAT_NAME |
4515 DIFF_FORMAT_NAME_STATUS |
4516 DIFF_FORMAT_CHECKDIFF |
4517 DIFF_FORMAT_NO_OUTPUT))
4518 options->output_format &= ~(DIFF_FORMAT_RAW |
4519 DIFF_FORMAT_NUMSTAT |
4520 DIFF_FORMAT_DIFFSTAT |
4521 DIFF_FORMAT_SHORTSTAT |
4522 DIFF_FORMAT_DIRSTAT |
4523 DIFF_FORMAT_SUMMARY |
4524 DIFF_FORMAT_PATCH);
4525
4526 /*
4527 * These cases always need recursive; we do not drop caller-supplied
4528 * recursive bits for other formats here.
4529 */
4530 if (options->output_format & (DIFF_FORMAT_PATCH |
4531 DIFF_FORMAT_NUMSTAT |
4532 DIFF_FORMAT_DIFFSTAT |
4533 DIFF_FORMAT_SHORTSTAT |
4534 DIFF_FORMAT_DIRSTAT |
4535 DIFF_FORMAT_SUMMARY |
4536 DIFF_FORMAT_CHECKDIFF))
4537 options->flags.recursive = 1;
4538 /*
4539 * Also pickaxe would not work very well if you do not say recursive
4540 */
4541 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4542 options->flags.recursive = 1;
4543 /*
4544 * When patches are generated, submodules diffed against the work tree
4545 * must be checked for dirtiness too so it can be shown in the output
4546 */
4547 if (options->output_format & DIFF_FORMAT_PATCH)
4548 options->flags.dirty_submodules = 1;
4549
4550 if (options->detect_rename && options->rename_limit < 0)
4551 options->rename_limit = diff_rename_limit_default;
4552 if (hexsz < options->abbrev)
4553 options->abbrev = hexsz; /* full */
4554
4555 /*
4556 * It does not make sense to show the first hit we happened
4557 * to have found. It does not make sense not to return with
4558 * exit code in such a case either.
4559 */
4560 if (options->flags.quick) {
4561 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4562 options->flags.exit_with_status = 1;
4563 }
4564
4565 options->diff_path_counter = 0;
4566
4567 if (options->flags.follow_renames && options->pathspec.nr != 1)
4568 die(_("--follow requires exactly one pathspec"));
4569
4570 if (!options->use_color || external_diff())
4571 options->color_moved = 0;
4572
4573 FREE_AND_NULL(options->parseopts);
4574 }
4575
4576 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4577 {
4578 char c, *eq;
4579 int len;
4580
4581 if (*arg != '-')
4582 return 0;
4583 c = *++arg;
4584 if (!c)
4585 return 0;
4586 if (c == arg_short) {
4587 c = *++arg;
4588 if (!c)
4589 return 1;
4590 if (val && isdigit(c)) {
4591 char *end;
4592 int n = strtoul(arg, &end, 10);
4593 if (*end)
4594 return 0;
4595 *val = n;
4596 return 1;
4597 }
4598 return 0;
4599 }
4600 if (c != '-')
4601 return 0;
4602 arg++;
4603 eq = strchrnul(arg, '=');
4604 len = eq - arg;
4605 if (!len || strncmp(arg, arg_long, len))
4606 return 0;
4607 if (*eq) {
4608 int n;
4609 char *end;
4610 if (!isdigit(*++eq))
4611 return 0;
4612 n = strtoul(eq, &end, 10);
4613 if (*end)
4614 return 0;
4615 *val = n;
4616 }
4617 return 1;
4618 }
4619
4620 static int diff_scoreopt_parse(const char *opt);
4621
4622 static inline int short_opt(char opt, const char **argv,
4623 const char **optarg)
4624 {
4625 const char *arg = argv[0];
4626 if (arg[0] != '-' || arg[1] != opt)
4627 return 0;
4628 if (arg[2] != '\0') {
4629 *optarg = arg + 2;
4630 return 1;
4631 }
4632 if (!argv[1])
4633 die("Option '%c' requires a value", opt);
4634 *optarg = argv[1];
4635 return 2;
4636 }
4637
4638 int parse_long_opt(const char *opt, const char **argv,
4639 const char **optarg)
4640 {
4641 const char *arg = argv[0];
4642 if (!skip_prefix(arg, "--", &arg))
4643 return 0;
4644 if (!skip_prefix(arg, opt, &arg))
4645 return 0;
4646 if (*arg == '=') { /* stuck form: --option=value */
4647 *optarg = arg + 1;
4648 return 1;
4649 }
4650 if (*arg != '\0')
4651 return 0;
4652 /* separate form: --option value */
4653 if (!argv[1])
4654 die("Option '--%s' requires a value", opt);
4655 *optarg = argv[1];
4656 return 2;
4657 }
4658
4659 static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4660 {
4661 struct diff_options *options = opt->value;
4662 int width = options->stat_width;
4663 int name_width = options->stat_name_width;
4664 int graph_width = options->stat_graph_width;
4665 int count = options->stat_count;
4666 char *end;
4667
4668 BUG_ON_OPT_NEG(unset);
4669
4670 if (!strcmp(opt->long_name, "stat")) {
4671 if (value) {
4672 width = strtoul(value, &end, 10);
4673 if (*end == ',')
4674 name_width = strtoul(end+1, &end, 10);
4675 if (*end == ',')
4676 count = strtoul(end+1, &end, 10);
4677 if (*end)
4678 return error(_("invalid --stat value: %s"), value);
4679 }
4680 } else if (!strcmp(opt->long_name, "stat-width")) {
4681 width = strtoul(value, &end, 10);
4682 if (*end)
4683 return error(_("%s expects a numerical value"),
4684 opt->long_name);
4685 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4686 name_width = strtoul(value, &end, 10);
4687 if (*end)
4688 return error(_("%s expects a numerical value"),
4689 opt->long_name);
4690 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4691 graph_width = strtoul(value, &end, 10);
4692 if (*end)
4693 return error(_("%s expects a numerical value"),
4694 opt->long_name);
4695 } else if (!strcmp(opt->long_name, "stat-count")) {
4696 count = strtoul(value, &end, 10);
4697 if (*end)
4698 return error(_("%s expects a numerical value"),
4699 opt->long_name);
4700 } else
4701 BUG("%s should not get here", opt->long_name);
4702
4703 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4704 options->stat_name_width = name_width;
4705 options->stat_graph_width = graph_width;
4706 options->stat_width = width;
4707 options->stat_count = count;
4708 return 0;
4709 }
4710
4711 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4712 {
4713 struct strbuf errmsg = STRBUF_INIT;
4714 if (parse_dirstat_params(options, params, &errmsg))
4715 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4716 errmsg.buf);
4717 strbuf_release(&errmsg);
4718 /*
4719 * The caller knows a dirstat-related option is given from the command
4720 * line; allow it to say "return this_function();"
4721 */
4722 options->output_format |= DIFF_FORMAT_DIRSTAT;
4723 return 1;
4724 }
4725
4726 static int parse_submodule_opt(struct diff_options *options, const char *value)
4727 {
4728 if (parse_submodule_params(options, value))
4729 die(_("Failed to parse --submodule option parameter: '%s'"),
4730 value);
4731 return 1;
4732 }
4733
4734 static const char diff_status_letters[] = {
4735 DIFF_STATUS_ADDED,
4736 DIFF_STATUS_COPIED,
4737 DIFF_STATUS_DELETED,
4738 DIFF_STATUS_MODIFIED,
4739 DIFF_STATUS_RENAMED,
4740 DIFF_STATUS_TYPE_CHANGED,
4741 DIFF_STATUS_UNKNOWN,
4742 DIFF_STATUS_UNMERGED,
4743 DIFF_STATUS_FILTER_AON,
4744 DIFF_STATUS_FILTER_BROKEN,
4745 '\0',
4746 };
4747
4748 static unsigned int filter_bit['Z' + 1];
4749
4750 static void prepare_filter_bits(void)
4751 {
4752 int i;
4753
4754 if (!filter_bit[DIFF_STATUS_ADDED]) {
4755 for (i = 0; diff_status_letters[i]; i++)
4756 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4757 }
4758 }
4759
4760 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4761 {
4762 return opt->filter & filter_bit[(int) status];
4763 }
4764
4765 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4766 {
4767 int i, optch;
4768
4769 prepare_filter_bits();
4770
4771 /*
4772 * If there is a negation e.g. 'd' in the input, and we haven't
4773 * initialized the filter field with another --diff-filter, start
4774 * from full set of bits, except for AON.
4775 */
4776 if (!opt->filter) {
4777 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4778 if (optch < 'a' || 'z' < optch)
4779 continue;
4780 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4781 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4782 break;
4783 }
4784 }
4785
4786 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4787 unsigned int bit;
4788 int negate;
4789
4790 if ('a' <= optch && optch <= 'z') {
4791 negate = 1;
4792 optch = toupper(optch);
4793 } else {
4794 negate = 0;
4795 }
4796
4797 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4798 if (!bit)
4799 return optarg[i];
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 parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4815 {
4816 int val = parse_ws_error_highlight(arg);
4817
4818 if (val < 0) {
4819 error("unknown value after ws-error-highlight=%.*s",
4820 -1 - val, arg);
4821 return 0;
4822 }
4823 opt->ws_error_highlight = val;
4824 return 1;
4825 }
4826
4827 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4828 {
4829 struct object_id oid;
4830
4831 if (get_oid(arg, &oid))
4832 return error("unable to resolve '%s'", arg);
4833
4834 if (!opt->objfind)
4835 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4836
4837 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4838 opt->flags.recursive = 1;
4839 opt->flags.tree_in_recursive = 1;
4840 oidset_insert(opt->objfind, &oid);
4841 return 1;
4842 }
4843
4844 static int diff_opt_break_rewrites(const struct option *opt,
4845 const char *arg, int unset)
4846 {
4847 int *break_opt = opt->value;
4848 int opt1, opt2;
4849
4850 BUG_ON_OPT_NEG(unset);
4851 if (!arg)
4852 arg = "";
4853 opt1 = parse_rename_score(&arg);
4854 if (*arg == 0)
4855 opt2 = 0;
4856 else if (*arg != '/')
4857 return error(_("%s expects <n>/<m> form"), opt->long_name);
4858 else {
4859 arg++;
4860 opt2 = parse_rename_score(&arg);
4861 }
4862 if (*arg != 0)
4863 return error(_("%s expects <n>/<m> form"), opt->long_name);
4864 *break_opt = opt1 | (opt2 << 16);
4865 return 0;
4866 }
4867
4868 static int diff_opt_char(const struct option *opt,
4869 const char *arg, int unset)
4870 {
4871 char *value = opt->value;
4872
4873 BUG_ON_OPT_NEG(unset);
4874 if (arg[1])
4875 return error(_("%s expects a character, got '%s'"),
4876 opt->long_name, arg);
4877 *value = arg[0];
4878 return 0;
4879 }
4880
4881 static int diff_opt_compact_summary(const struct option *opt,
4882 const char *arg, int unset)
4883 {
4884 struct diff_options *options = opt->value;
4885
4886 BUG_ON_OPT_ARG(arg);
4887 if (unset) {
4888 options->flags.stat_with_summary = 0;
4889 } else {
4890 options->flags.stat_with_summary = 1;
4891 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4892 }
4893 return 0;
4894 }
4895
4896 static int diff_opt_dirstat(const struct option *opt,
4897 const char *arg, int unset)
4898 {
4899 struct diff_options *options = opt->value;
4900
4901 BUG_ON_OPT_NEG(unset);
4902 if (!strcmp(opt->long_name, "cumulative")) {
4903 if (arg)
4904 BUG("how come --cumulative take a value?");
4905 arg = "cumulative";
4906 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
4907 parse_dirstat_opt(options, "files");
4908 parse_dirstat_opt(options, arg ? arg : "");
4909 return 0;
4910 }
4911
4912 static int diff_opt_find_renames(const struct option *opt,
4913 const char *arg, int unset)
4914 {
4915 struct diff_options *options = opt->value;
4916
4917 BUG_ON_OPT_NEG(unset);
4918 if (!arg)
4919 arg = "";
4920 options->rename_score = parse_rename_score(&arg);
4921 if (*arg != 0)
4922 return error(_("invalid argument to %s"), opt->long_name);
4923
4924 options->detect_rename = DIFF_DETECT_RENAME;
4925 return 0;
4926 }
4927
4928 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
4929 const struct option *opt,
4930 const char *arg, int unset)
4931 {
4932 struct diff_options *options = opt->value;
4933 char *path;
4934
4935 BUG_ON_OPT_NEG(unset);
4936 path = prefix_filename(ctx->prefix, arg);
4937 options->file = xfopen(path, "w");
4938 options->close_file = 1;
4939 if (options->use_color != GIT_COLOR_ALWAYS)
4940 options->use_color = GIT_COLOR_NEVER;
4941 free(path);
4942 return 0;
4943 }
4944
4945 static int diff_opt_unified(const struct option *opt,
4946 const char *arg, int unset)
4947 {
4948 struct diff_options *options = opt->value;
4949 char *s;
4950
4951 BUG_ON_OPT_NEG(unset);
4952
4953 options->context = strtol(arg, &s, 10);
4954 if (*s)
4955 return error(_("%s expects a numerical value"), "--unified");
4956 enable_patch_output(&options->output_format);
4957
4958 return 0;
4959 }
4960
4961 static void prep_parse_options(struct diff_options *options)
4962 {
4963 struct option parseopts[] = {
4964 OPT_GROUP(N_("Diff output format options")),
4965 OPT_BITOP('p', "patch", &options->output_format,
4966 N_("generate patch"),
4967 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
4968 OPT_BIT_F('s', "no-patch", &options->output_format,
4969 N_("suppress diff output"),
4970 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
4971 OPT_BITOP('u', NULL, &options->output_format,
4972 N_("generate patch"),
4973 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
4974 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
4975 N_("generate diffs with <n> lines context"),
4976 PARSE_OPT_NONEG, diff_opt_unified),
4977 OPT_BOOL('W', "function-context", &options->flags.funccontext,
4978 N_("generate diffs with <n> lines context")),
4979 OPT_BIT_F(0, "raw", &options->output_format,
4980 N_("generate the diff in raw format"),
4981 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
4982 OPT_BITOP(0, "patch-with-raw", &options->output_format,
4983 N_("synonym for '-p --raw'"),
4984 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
4985 DIFF_FORMAT_NO_OUTPUT),
4986 OPT_BITOP(0, "patch-with-stat", &options->output_format,
4987 N_("synonym for '-p --stat'"),
4988 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
4989 DIFF_FORMAT_NO_OUTPUT),
4990 OPT_BIT_F(0, "numstat", &options->output_format,
4991 N_("machine friendly --stat"),
4992 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
4993 OPT_BIT_F(0, "shortstat", &options->output_format,
4994 N_("output only the last line of --stat"),
4995 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
4996 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
4997 N_("output the distribution of relative amount of changes for each sub-directory"),
4998 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
4999 diff_opt_dirstat),
5000 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5001 N_("synonym for --dirstat=cumulative"),
5002 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5003 diff_opt_dirstat),
5004 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5005 N_("synonym for --dirstat=files,param1,param2..."),
5006 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5007 diff_opt_dirstat),
5008 OPT_BIT_F(0, "check", &options->output_format,
5009 N_("warn if changes introduce conflict markers or whitespace errors"),
5010 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
5011 OPT_BIT_F(0, "summary", &options->output_format,
5012 N_("condensed summary such as creations, renames and mode changes"),
5013 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
5014 OPT_BIT_F(0, "name-only", &options->output_format,
5015 N_("show only names of changed files"),
5016 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
5017 OPT_BIT_F(0, "name-status", &options->output_format,
5018 N_("show only names and status of changed files"),
5019 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
5020 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5021 N_("generate diffstat"),
5022 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5023 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5024 N_("generate diffstat with a given width"),
5025 PARSE_OPT_NONEG, diff_opt_stat),
5026 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5027 N_("generate diffstat with a given name width"),
5028 PARSE_OPT_NONEG, diff_opt_stat),
5029 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5030 N_("generate diffstat with a given graph width"),
5031 PARSE_OPT_NONEG, diff_opt_stat),
5032 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5033 N_("generate diffstat with limited lines"),
5034 PARSE_OPT_NONEG, diff_opt_stat),
5035 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5036 N_("generate compact summary in diffstat"),
5037 PARSE_OPT_NOARG, diff_opt_compact_summary),
5038 OPT_CALLBACK_F(0, "output-indicator-new",
5039 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5040 N_("<char>"),
5041 N_("specify the character to indicate a new line instead of '+'"),
5042 PARSE_OPT_NONEG, diff_opt_char),
5043 OPT_CALLBACK_F(0, "output-indicator-old",
5044 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5045 N_("<char>"),
5046 N_("specify the character to indicate an old line instead of '-'"),
5047 PARSE_OPT_NONEG, diff_opt_char),
5048 OPT_CALLBACK_F(0, "output-indicator-context",
5049 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5050 N_("<char>"),
5051 N_("specify the character to indicate a context instead of ' '"),
5052 PARSE_OPT_NONEG, diff_opt_char),
5053
5054 OPT_GROUP(N_("Diff rename options")),
5055 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5056 N_("break complete rewrite changes into pairs of delete and create"),
5057 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5058 diff_opt_break_rewrites),
5059 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5060 N_("detect renames"),
5061 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5062 diff_opt_find_renames),
5063
5064 OPT_GROUP(N_("Diff other options")),
5065 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5066 N_("Output to a specific file"),
5067 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5068
5069 OPT_END()
5070 };
5071
5072 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5073 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5074 }
5075
5076 int diff_opt_parse(struct diff_options *options,
5077 const char **av, int ac, const char *prefix)
5078 {
5079 const char *arg = av[0];
5080 const char *optarg;
5081 int argcount;
5082
5083 if (!prefix)
5084 prefix = "";
5085
5086 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5087 PARSE_OPT_KEEP_DASHDASH |
5088 PARSE_OPT_KEEP_UNKNOWN |
5089 PARSE_OPT_NO_INTERNAL_HELP |
5090 PARSE_OPT_ONE_SHOT |
5091 PARSE_OPT_STOP_AT_NON_OPTION);
5092
5093 if (ac)
5094 return ac;
5095
5096 /* renames options */
5097 if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
5098 options->irreversible_delete = 1;
5099 }
5100 else if (starts_with(arg, "-C") ||
5101 skip_to_optional_arg(arg, "--find-copies", NULL)) {
5102 if (options->detect_rename == DIFF_DETECT_COPY)
5103 options->flags.find_copies_harder = 1;
5104 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
5105 return error("invalid argument to -C: %s", arg+2);
5106 options->detect_rename = DIFF_DETECT_COPY;
5107 }
5108 else if (!strcmp(arg, "--no-renames"))
5109 options->detect_rename = 0;
5110 else if (!strcmp(arg, "--rename-empty"))
5111 options->flags.rename_empty = 1;
5112 else if (!strcmp(arg, "--no-rename-empty"))
5113 options->flags.rename_empty = 0;
5114 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
5115 options->flags.relative_name = 1;
5116 if (arg)
5117 options->prefix = arg;
5118 }
5119
5120 /* xdiff options */
5121 else if (!strcmp(arg, "--minimal"))
5122 DIFF_XDL_SET(options, NEED_MINIMAL);
5123 else if (!strcmp(arg, "--no-minimal"))
5124 DIFF_XDL_CLR(options, NEED_MINIMAL);
5125 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
5126 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
5127 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
5128 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
5129 else if (!strcmp(arg, "--ignore-space-at-eol"))
5130 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
5131 else if (!strcmp(arg, "--ignore-cr-at-eol"))
5132 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
5133 else if (!strcmp(arg, "--ignore-blank-lines"))
5134 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
5135 else if (!strcmp(arg, "--indent-heuristic"))
5136 DIFF_XDL_SET(options, INDENT_HEURISTIC);
5137 else if (!strcmp(arg, "--no-indent-heuristic"))
5138 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
5139 else if (!strcmp(arg, "--patience")) {
5140 int i;
5141 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5142 /*
5143 * Both --patience and --anchored use PATIENCE_DIFF
5144 * internally, so remove any anchors previously
5145 * specified.
5146 */
5147 for (i = 0; i < options->anchors_nr; i++)
5148 free(options->anchors[i]);
5149 options->anchors_nr = 0;
5150 } else if (!strcmp(arg, "--histogram"))
5151 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
5152 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
5153 long value = parse_algorithm_value(optarg);
5154 if (value < 0)
5155 return error("option diff-algorithm accepts \"myers\", "
5156 "\"minimal\", \"patience\" and \"histogram\"");
5157 /* clear out previous settings */
5158 DIFF_XDL_CLR(options, NEED_MINIMAL);
5159 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5160 options->xdl_opts |= value;
5161 return argcount;
5162 } else if (skip_prefix(arg, "--anchored=", &arg)) {
5163 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5164 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
5165 options->anchors_alloc);
5166 options->anchors[options->anchors_nr++] = xstrdup(arg);
5167 }
5168
5169 /* flags options */
5170 else if (!strcmp(arg, "--binary")) {
5171 enable_patch_output(&options->output_format);
5172 options->flags.binary = 1;
5173 }
5174 else if (!strcmp(arg, "--full-index"))
5175 options->flags.full_index = 1;
5176 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
5177 options->flags.text = 1;
5178 else if (!strcmp(arg, "-R"))
5179 options->flags.reverse_diff = 1;
5180 else if (!strcmp(arg, "--find-copies-harder"))
5181 options->flags.find_copies_harder = 1;
5182 else if (!strcmp(arg, "--follow"))
5183 options->flags.follow_renames = 1;
5184 else if (!strcmp(arg, "--no-follow")) {
5185 options->flags.follow_renames = 0;
5186 options->flags.default_follow_renames = 0;
5187 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
5188 int value = git_config_colorbool(NULL, arg);
5189 if (value < 0)
5190 return error("option `color' expects \"always\", \"auto\", or \"never\"");
5191 options->use_color = value;
5192 }
5193 else if (!strcmp(arg, "--no-color"))
5194 options->use_color = 0;
5195 else if (!strcmp(arg, "--color-moved")) {
5196 if (diff_color_moved_default)
5197 options->color_moved = diff_color_moved_default;
5198 if (options->color_moved == COLOR_MOVED_NO)
5199 options->color_moved = COLOR_MOVED_DEFAULT;
5200 } else if (!strcmp(arg, "--no-color-moved"))
5201 options->color_moved = COLOR_MOVED_NO;
5202 else if (skip_prefix(arg, "--color-moved=", &arg)) {
5203 int cm = parse_color_moved(arg);
5204 if (cm < 0)
5205 return error("bad --color-moved argument: %s", arg);
5206 options->color_moved = cm;
5207 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
5208 unsigned cm = parse_color_moved_ws(arg);
5209 if (cm & COLOR_MOVED_WS_ERROR)
5210 return -1;
5211 options->color_moved_ws_handling = cm;
5212 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
5213 options->use_color = 1;
5214 options->word_diff = DIFF_WORDS_COLOR;
5215 }
5216 else if (!strcmp(arg, "--word-diff")) {
5217 if (options->word_diff == DIFF_WORDS_NONE)
5218 options->word_diff = DIFF_WORDS_PLAIN;
5219 }
5220 else if (skip_prefix(arg, "--word-diff=", &arg)) {
5221 if (!strcmp(arg, "plain"))
5222 options->word_diff = DIFF_WORDS_PLAIN;
5223 else if (!strcmp(arg, "color")) {
5224 options->use_color = 1;
5225 options->word_diff = DIFF_WORDS_COLOR;
5226 }
5227 else if (!strcmp(arg, "porcelain"))
5228 options->word_diff = DIFF_WORDS_PORCELAIN;
5229 else if (!strcmp(arg, "none"))
5230 options->word_diff = DIFF_WORDS_NONE;
5231 else
5232 die("bad --word-diff argument: %s", arg);
5233 }
5234 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5235 if (options->word_diff == DIFF_WORDS_NONE)
5236 options->word_diff = DIFF_WORDS_PLAIN;
5237 options->word_regex = optarg;
5238 return argcount;
5239 }
5240 else if (!strcmp(arg, "--exit-code"))
5241 options->flags.exit_with_status = 1;
5242 else if (!strcmp(arg, "--quiet"))
5243 options->flags.quick = 1;
5244 else if (!strcmp(arg, "--ext-diff"))
5245 options->flags.allow_external = 1;
5246 else if (!strcmp(arg, "--no-ext-diff"))
5247 options->flags.allow_external = 0;
5248 else if (!strcmp(arg, "--textconv")) {
5249 options->flags.allow_textconv = 1;
5250 options->flags.textconv_set_via_cmdline = 1;
5251 } else if (!strcmp(arg, "--no-textconv"))
5252 options->flags.allow_textconv = 0;
5253 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5254 options->flags.override_submodule_config = 1;
5255 handle_ignore_submodules_arg(options, arg);
5256 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5257 return parse_submodule_opt(options, arg);
5258 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5259 return parse_ws_error_highlight_opt(options, arg);
5260 else if (!strcmp(arg, "--ita-invisible-in-index"))
5261 options->ita_invisible_in_index = 1;
5262 else if (!strcmp(arg, "--ita-visible-in-index"))
5263 options->ita_invisible_in_index = 0;
5264
5265 /* misc options */
5266 else if (!strcmp(arg, "-z"))
5267 options->line_termination = 0;
5268 else if ((argcount = short_opt('l', av, &optarg))) {
5269 options->rename_limit = strtoul(optarg, NULL, 10);
5270 return argcount;
5271 }
5272 else if ((argcount = short_opt('S', av, &optarg))) {
5273 options->pickaxe = optarg;
5274 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5275 return argcount;
5276 } else if ((argcount = short_opt('G', av, &optarg))) {
5277 options->pickaxe = optarg;
5278 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5279 return argcount;
5280 }
5281 else if (!strcmp(arg, "--pickaxe-all"))
5282 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5283 else if (!strcmp(arg, "--pickaxe-regex"))
5284 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5285 else if ((argcount = short_opt('O', av, &optarg))) {
5286 options->orderfile = prefix_filename(prefix, optarg);
5287 return argcount;
5288 } else if (skip_prefix(arg, "--find-object=", &arg))
5289 return parse_objfind_opt(options, arg);
5290 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5291 int offending = parse_diff_filter_opt(optarg, options);
5292 if (offending)
5293 die("unknown change class '%c' in --diff-filter=%s",
5294 offending, optarg);
5295 return argcount;
5296 }
5297 else if (!strcmp(arg, "--no-abbrev"))
5298 options->abbrev = 0;
5299 else if (!strcmp(arg, "--abbrev"))
5300 options->abbrev = DEFAULT_ABBREV;
5301 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5302 options->abbrev = strtoul(arg, NULL, 10);
5303 if (options->abbrev < MINIMUM_ABBREV)
5304 options->abbrev = MINIMUM_ABBREV;
5305 else if (the_hash_algo->hexsz < options->abbrev)
5306 options->abbrev = the_hash_algo->hexsz;
5307 }
5308 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5309 options->a_prefix = optarg;
5310 return argcount;
5311 }
5312 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5313 options->line_prefix = optarg;
5314 options->line_prefix_length = strlen(options->line_prefix);
5315 graph_setup_line_prefix(options);
5316 return argcount;
5317 }
5318 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5319 options->b_prefix = optarg;
5320 return argcount;
5321 }
5322 else if (!strcmp(arg, "--no-prefix"))
5323 options->a_prefix = options->b_prefix = "";
5324 else if (opt_arg(arg, '\0', "inter-hunk-context",
5325 &options->interhunkcontext))
5326 ;
5327 else
5328 return 0;
5329 return 1;
5330 }
5331
5332 int parse_rename_score(const char **cp_p)
5333 {
5334 unsigned long num, scale;
5335 int ch, dot;
5336 const char *cp = *cp_p;
5337
5338 num = 0;
5339 scale = 1;
5340 dot = 0;
5341 for (;;) {
5342 ch = *cp;
5343 if ( !dot && ch == '.' ) {
5344 scale = 1;
5345 dot = 1;
5346 } else if ( ch == '%' ) {
5347 scale = dot ? scale*100 : 100;
5348 cp++; /* % is always at the end */
5349 break;
5350 } else if ( ch >= '0' && ch <= '9' ) {
5351 if ( scale < 100000 ) {
5352 scale *= 10;
5353 num = (num*10) + (ch-'0');
5354 }
5355 } else {
5356 break;
5357 }
5358 cp++;
5359 }
5360 *cp_p = cp;
5361
5362 /* user says num divided by scale and we say internally that
5363 * is MAX_SCORE * num / scale.
5364 */
5365 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5366 }
5367
5368 static int diff_scoreopt_parse(const char *opt)
5369 {
5370 int opt1, cmd;
5371
5372 if (*opt++ != '-')
5373 return -1;
5374 cmd = *opt++;
5375 if (cmd == '-') {
5376 /* convert the long-form arguments into short-form versions */
5377 if (skip_prefix(opt, "find-copies", &opt)) {
5378 if (*opt == 0 || *opt++ == '=')
5379 cmd = 'C';
5380 }
5381 }
5382 if (cmd != 'C')
5383 return -1; /* that is not a -M option */
5384
5385 opt1 = parse_rename_score(&opt);
5386 if (*opt != 0)
5387 return -1;
5388 return opt1;
5389 }
5390
5391 struct diff_queue_struct diff_queued_diff;
5392
5393 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5394 {
5395 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5396 queue->queue[queue->nr++] = dp;
5397 }
5398
5399 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5400 struct diff_filespec *one,
5401 struct diff_filespec *two)
5402 {
5403 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5404 dp->one = one;
5405 dp->two = two;
5406 if (queue)
5407 diff_q(queue, dp);
5408 return dp;
5409 }
5410
5411 void diff_free_filepair(struct diff_filepair *p)
5412 {
5413 free_filespec(p->one);
5414 free_filespec(p->two);
5415 free(p);
5416 }
5417
5418 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5419 {
5420 int abblen;
5421 const char *abbrev;
5422
5423 /* Do we want all 40 hex characters? */
5424 if (len == the_hash_algo->hexsz)
5425 return oid_to_hex(oid);
5426
5427 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5428 abbrev = diff_abbrev_oid(oid, len);
5429
5430 if (!print_sha1_ellipsis())
5431 return abbrev;
5432
5433 abblen = strlen(abbrev);
5434
5435 /*
5436 * In well-behaved cases, where the abbreviated result is the
5437 * same as the requested length, append three dots after the
5438 * abbreviation (hence the whole logic is limited to the case
5439 * where abblen < 37); when the actual abbreviated result is a
5440 * bit longer than the requested length, we reduce the number
5441 * of dots so that they match the well-behaved ones. However,
5442 * if the actual abbreviation is longer than the requested
5443 * length by more than three, we give up on aligning, and add
5444 * three dots anyway, to indicate that the output is not the
5445 * full object name. Yes, this may be suboptimal, but this
5446 * appears only in "diff --raw --abbrev" output and it is not
5447 * worth the effort to change it now. Note that this would
5448 * likely to work fine when the automatic sizing of default
5449 * abbreviation length is used--we would be fed -1 in "len" in
5450 * that case, and will end up always appending three-dots, but
5451 * the automatic sizing is supposed to give abblen that ensures
5452 * uniqueness across all objects (statistically speaking).
5453 */
5454 if (abblen < the_hash_algo->hexsz - 3) {
5455 static char hex[GIT_MAX_HEXSZ + 1];
5456 if (len < abblen && abblen <= len + 2)
5457 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5458 else
5459 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5460 return hex;
5461 }
5462
5463 return oid_to_hex(oid);
5464 }
5465
5466 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5467 {
5468 int line_termination = opt->line_termination;
5469 int inter_name_termination = line_termination ? '\t' : '\0';
5470
5471 fprintf(opt->file, "%s", diff_line_prefix(opt));
5472 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5473 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5474 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5475 fprintf(opt->file, "%s ",
5476 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5477 }
5478 if (p->score) {
5479 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5480 inter_name_termination);
5481 } else {
5482 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5483 }
5484
5485 if (p->status == DIFF_STATUS_COPIED ||
5486 p->status == DIFF_STATUS_RENAMED) {
5487 const char *name_a, *name_b;
5488 name_a = p->one->path;
5489 name_b = p->two->path;
5490 strip_prefix(opt->prefix_length, &name_a, &name_b);
5491 write_name_quoted(name_a, opt->file, inter_name_termination);
5492 write_name_quoted(name_b, opt->file, line_termination);
5493 } else {
5494 const char *name_a, *name_b;
5495 name_a = p->one->mode ? p->one->path : p->two->path;
5496 name_b = NULL;
5497 strip_prefix(opt->prefix_length, &name_a, &name_b);
5498 write_name_quoted(name_a, opt->file, line_termination);
5499 }
5500 }
5501
5502 int diff_unmodified_pair(struct diff_filepair *p)
5503 {
5504 /* This function is written stricter than necessary to support
5505 * the currently implemented transformers, but the idea is to
5506 * let transformers to produce diff_filepairs any way they want,
5507 * and filter and clean them up here before producing the output.
5508 */
5509 struct diff_filespec *one = p->one, *two = p->two;
5510
5511 if (DIFF_PAIR_UNMERGED(p))
5512 return 0; /* unmerged is interesting */
5513
5514 /* deletion, addition, mode or type change
5515 * and rename are all interesting.
5516 */
5517 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5518 DIFF_PAIR_MODE_CHANGED(p) ||
5519 strcmp(one->path, two->path))
5520 return 0;
5521
5522 /* both are valid and point at the same path. that is, we are
5523 * dealing with a change.
5524 */
5525 if (one->oid_valid && two->oid_valid &&
5526 oideq(&one->oid, &two->oid) &&
5527 !one->dirty_submodule && !two->dirty_submodule)
5528 return 1; /* no change */
5529 if (!one->oid_valid && !two->oid_valid)
5530 return 1; /* both look at the same file on the filesystem. */
5531 return 0;
5532 }
5533
5534 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5535 {
5536 if (diff_unmodified_pair(p))
5537 return;
5538
5539 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5540 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5541 return; /* no tree diffs in patch format */
5542
5543 run_diff(p, o);
5544 }
5545
5546 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5547 struct diffstat_t *diffstat)
5548 {
5549 if (diff_unmodified_pair(p))
5550 return;
5551
5552 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5553 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5554 return; /* no useful stat for tree diffs */
5555
5556 run_diffstat(p, o, diffstat);
5557 }
5558
5559 static void diff_flush_checkdiff(struct diff_filepair *p,
5560 struct diff_options *o)
5561 {
5562 if (diff_unmodified_pair(p))
5563 return;
5564
5565 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5566 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5567 return; /* nothing to check in tree diffs */
5568
5569 run_checkdiff(p, o);
5570 }
5571
5572 int diff_queue_is_empty(void)
5573 {
5574 struct diff_queue_struct *q = &diff_queued_diff;
5575 int i;
5576 for (i = 0; i < q->nr; i++)
5577 if (!diff_unmodified_pair(q->queue[i]))
5578 return 0;
5579 return 1;
5580 }
5581
5582 #if DIFF_DEBUG
5583 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5584 {
5585 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5586 x, one ? one : "",
5587 s->path,
5588 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5589 s->mode,
5590 s->oid_valid ? oid_to_hex(&s->oid) : "");
5591 fprintf(stderr, "queue[%d] %s size %lu\n",
5592 x, one ? one : "",
5593 s->size);
5594 }
5595
5596 void diff_debug_filepair(const struct diff_filepair *p, int i)
5597 {
5598 diff_debug_filespec(p->one, i, "one");
5599 diff_debug_filespec(p->two, i, "two");
5600 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5601 p->score, p->status ? p->status : '?',
5602 p->one->rename_used, p->broken_pair);
5603 }
5604
5605 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5606 {
5607 int i;
5608 if (msg)
5609 fprintf(stderr, "%s\n", msg);
5610 fprintf(stderr, "q->nr = %d\n", q->nr);
5611 for (i = 0; i < q->nr; i++) {
5612 struct diff_filepair *p = q->queue[i];
5613 diff_debug_filepair(p, i);
5614 }
5615 }
5616 #endif
5617
5618 static void diff_resolve_rename_copy(void)
5619 {
5620 int i;
5621 struct diff_filepair *p;
5622 struct diff_queue_struct *q = &diff_queued_diff;
5623
5624 diff_debug_queue("resolve-rename-copy", q);
5625
5626 for (i = 0; i < q->nr; i++) {
5627 p = q->queue[i];
5628 p->status = 0; /* undecided */
5629 if (DIFF_PAIR_UNMERGED(p))
5630 p->status = DIFF_STATUS_UNMERGED;
5631 else if (!DIFF_FILE_VALID(p->one))
5632 p->status = DIFF_STATUS_ADDED;
5633 else if (!DIFF_FILE_VALID(p->two))
5634 p->status = DIFF_STATUS_DELETED;
5635 else if (DIFF_PAIR_TYPE_CHANGED(p))
5636 p->status = DIFF_STATUS_TYPE_CHANGED;
5637
5638 /* from this point on, we are dealing with a pair
5639 * whose both sides are valid and of the same type, i.e.
5640 * either in-place edit or rename/copy edit.
5641 */
5642 else if (DIFF_PAIR_RENAME(p)) {
5643 /*
5644 * A rename might have re-connected a broken
5645 * pair up, causing the pathnames to be the
5646 * same again. If so, that's not a rename at
5647 * all, just a modification..
5648 *
5649 * Otherwise, see if this source was used for
5650 * multiple renames, in which case we decrement
5651 * the count, and call it a copy.
5652 */
5653 if (!strcmp(p->one->path, p->two->path))
5654 p->status = DIFF_STATUS_MODIFIED;
5655 else if (--p->one->rename_used > 0)
5656 p->status = DIFF_STATUS_COPIED;
5657 else
5658 p->status = DIFF_STATUS_RENAMED;
5659 }
5660 else if (!oideq(&p->one->oid, &p->two->oid) ||
5661 p->one->mode != p->two->mode ||
5662 p->one->dirty_submodule ||
5663 p->two->dirty_submodule ||
5664 is_null_oid(&p->one->oid))
5665 p->status = DIFF_STATUS_MODIFIED;
5666 else {
5667 /* This is a "no-change" entry and should not
5668 * happen anymore, but prepare for broken callers.
5669 */
5670 error("feeding unmodified %s to diffcore",
5671 p->one->path);
5672 p->status = DIFF_STATUS_UNKNOWN;
5673 }
5674 }
5675 diff_debug_queue("resolve-rename-copy done", q);
5676 }
5677
5678 static int check_pair_status(struct diff_filepair *p)
5679 {
5680 switch (p->status) {
5681 case DIFF_STATUS_UNKNOWN:
5682 return 0;
5683 case 0:
5684 die("internal error in diff-resolve-rename-copy");
5685 default:
5686 return 1;
5687 }
5688 }
5689
5690 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5691 {
5692 int fmt = opt->output_format;
5693
5694 if (fmt & DIFF_FORMAT_CHECKDIFF)
5695 diff_flush_checkdiff(p, opt);
5696 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5697 diff_flush_raw(p, opt);
5698 else if (fmt & DIFF_FORMAT_NAME) {
5699 const char *name_a, *name_b;
5700 name_a = p->two->path;
5701 name_b = NULL;
5702 strip_prefix(opt->prefix_length, &name_a, &name_b);
5703 fprintf(opt->file, "%s", diff_line_prefix(opt));
5704 write_name_quoted(name_a, opt->file, opt->line_termination);
5705 }
5706 }
5707
5708 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5709 {
5710 struct strbuf sb = STRBUF_INIT;
5711 if (fs->mode)
5712 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5713 else
5714 strbuf_addf(&sb, " %s ", newdelete);
5715
5716 quote_c_style(fs->path, &sb, NULL, 0);
5717 strbuf_addch(&sb, '\n');
5718 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5719 sb.buf, sb.len, 0);
5720 strbuf_release(&sb);
5721 }
5722
5723 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5724 int show_name)
5725 {
5726 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5727 struct strbuf sb = STRBUF_INIT;
5728 strbuf_addf(&sb, " mode change %06o => %06o",
5729 p->one->mode, p->two->mode);
5730 if (show_name) {
5731 strbuf_addch(&sb, ' ');
5732 quote_c_style(p->two->path, &sb, NULL, 0);
5733 }
5734 strbuf_addch(&sb, '\n');
5735 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5736 sb.buf, sb.len, 0);
5737 strbuf_release(&sb);
5738 }
5739 }
5740
5741 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5742 struct diff_filepair *p)
5743 {
5744 struct strbuf sb = STRBUF_INIT;
5745 struct strbuf names = STRBUF_INIT;
5746
5747 pprint_rename(&names, p->one->path, p->two->path);
5748 strbuf_addf(&sb, " %s %s (%d%%)\n",
5749 renamecopy, names.buf, similarity_index(p));
5750 strbuf_release(&names);
5751 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5752 sb.buf, sb.len, 0);
5753 show_mode_change(opt, p, 0);
5754 strbuf_release(&sb);
5755 }
5756
5757 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5758 {
5759 switch(p->status) {
5760 case DIFF_STATUS_DELETED:
5761 show_file_mode_name(opt, "delete", p->one);
5762 break;
5763 case DIFF_STATUS_ADDED:
5764 show_file_mode_name(opt, "create", p->two);
5765 break;
5766 case DIFF_STATUS_COPIED:
5767 show_rename_copy(opt, "copy", p);
5768 break;
5769 case DIFF_STATUS_RENAMED:
5770 show_rename_copy(opt, "rename", p);
5771 break;
5772 default:
5773 if (p->score) {
5774 struct strbuf sb = STRBUF_INIT;
5775 strbuf_addstr(&sb, " rewrite ");
5776 quote_c_style(p->two->path, &sb, NULL, 0);
5777 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5778 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5779 sb.buf, sb.len, 0);
5780 strbuf_release(&sb);
5781 }
5782 show_mode_change(opt, p, !p->score);
5783 break;
5784 }
5785 }
5786
5787 struct patch_id_t {
5788 git_SHA_CTX *ctx;
5789 int patchlen;
5790 };
5791
5792 static int remove_space(char *line, int len)
5793 {
5794 int i;
5795 char *dst = line;
5796 unsigned char c;
5797
5798 for (i = 0; i < len; i++)
5799 if (!isspace((c = line[i])))
5800 *dst++ = c;
5801
5802 return dst - line;
5803 }
5804
5805 static void patch_id_consume(void *priv, char *line, unsigned long len)
5806 {
5807 struct patch_id_t *data = priv;
5808 int new_len;
5809
5810 new_len = remove_space(line, len);
5811
5812 git_SHA1_Update(data->ctx, line, new_len);
5813 data->patchlen += new_len;
5814 }
5815
5816 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5817 {
5818 git_SHA1_Update(ctx, str, strlen(str));
5819 }
5820
5821 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5822 {
5823 /* large enough for 2^32 in octal */
5824 char buf[12];
5825 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5826 git_SHA1_Update(ctx, buf, len);
5827 }
5828
5829 /* returns 0 upon success, and writes result into sha1 */
5830 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5831 {
5832 struct diff_queue_struct *q = &diff_queued_diff;
5833 int i;
5834 git_SHA_CTX ctx;
5835 struct patch_id_t data;
5836
5837 git_SHA1_Init(&ctx);
5838 memset(&data, 0, sizeof(struct patch_id_t));
5839 data.ctx = &ctx;
5840
5841 for (i = 0; i < q->nr; i++) {
5842 xpparam_t xpp;
5843 xdemitconf_t xecfg;
5844 mmfile_t mf1, mf2;
5845 struct diff_filepair *p = q->queue[i];
5846 int len1, len2;
5847
5848 memset(&xpp, 0, sizeof(xpp));
5849 memset(&xecfg, 0, sizeof(xecfg));
5850 if (p->status == 0)
5851 return error("internal diff status error");
5852 if (p->status == DIFF_STATUS_UNKNOWN)
5853 continue;
5854 if (diff_unmodified_pair(p))
5855 continue;
5856 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5857 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5858 continue;
5859 if (DIFF_PAIR_UNMERGED(p))
5860 continue;
5861
5862 diff_fill_oid_info(p->one, options->repo->index);
5863 diff_fill_oid_info(p->two, options->repo->index);
5864
5865 len1 = remove_space(p->one->path, strlen(p->one->path));
5866 len2 = remove_space(p->two->path, strlen(p->two->path));
5867 patch_id_add_string(&ctx, "diff--git");
5868 patch_id_add_string(&ctx, "a/");
5869 git_SHA1_Update(&ctx, p->one->path, len1);
5870 patch_id_add_string(&ctx, "b/");
5871 git_SHA1_Update(&ctx, p->two->path, len2);
5872
5873 if (p->one->mode == 0) {
5874 patch_id_add_string(&ctx, "newfilemode");
5875 patch_id_add_mode(&ctx, p->two->mode);
5876 patch_id_add_string(&ctx, "---/dev/null");
5877 patch_id_add_string(&ctx, "+++b/");
5878 git_SHA1_Update(&ctx, p->two->path, len2);
5879 } else if (p->two->mode == 0) {
5880 patch_id_add_string(&ctx, "deletedfilemode");
5881 patch_id_add_mode(&ctx, p->one->mode);
5882 patch_id_add_string(&ctx, "---a/");
5883 git_SHA1_Update(&ctx, p->one->path, len1);
5884 patch_id_add_string(&ctx, "+++/dev/null");
5885 } else {
5886 patch_id_add_string(&ctx, "---a/");
5887 git_SHA1_Update(&ctx, p->one->path, len1);
5888 patch_id_add_string(&ctx, "+++b/");
5889 git_SHA1_Update(&ctx, p->two->path, len2);
5890 }
5891
5892 if (diff_header_only)
5893 continue;
5894
5895 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
5896 fill_mmfile(options->repo, &mf2, p->two) < 0)
5897 return error("unable to read files to diff");
5898
5899 if (diff_filespec_is_binary(options->repo, p->one) ||
5900 diff_filespec_is_binary(options->repo, p->two)) {
5901 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5902 GIT_SHA1_HEXSZ);
5903 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5904 GIT_SHA1_HEXSZ);
5905 continue;
5906 }
5907
5908 xpp.flags = 0;
5909 xecfg.ctxlen = 3;
5910 xecfg.flags = 0;
5911 if (xdi_diff_outf(&mf1, &mf2, discard_hunk_line,
5912 patch_id_consume, &data, &xpp, &xecfg))
5913 return error("unable to generate patch-id diff for %s",
5914 p->one->path);
5915 }
5916
5917 git_SHA1_Final(oid->hash, &ctx);
5918 return 0;
5919 }
5920
5921 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5922 {
5923 struct diff_queue_struct *q = &diff_queued_diff;
5924 int i;
5925 int result = diff_get_patch_id(options, oid, diff_header_only);
5926
5927 for (i = 0; i < q->nr; i++)
5928 diff_free_filepair(q->queue[i]);
5929
5930 free(q->queue);
5931 DIFF_QUEUE_CLEAR(q);
5932
5933 return result;
5934 }
5935
5936 static int is_summary_empty(const struct diff_queue_struct *q)
5937 {
5938 int i;
5939
5940 for (i = 0; i < q->nr; i++) {
5941 const struct diff_filepair *p = q->queue[i];
5942
5943 switch (p->status) {
5944 case DIFF_STATUS_DELETED:
5945 case DIFF_STATUS_ADDED:
5946 case DIFF_STATUS_COPIED:
5947 case DIFF_STATUS_RENAMED:
5948 return 0;
5949 default:
5950 if (p->score)
5951 return 0;
5952 if (p->one->mode && p->two->mode &&
5953 p->one->mode != p->two->mode)
5954 return 0;
5955 break;
5956 }
5957 }
5958 return 1;
5959 }
5960
5961 static const char rename_limit_warning[] =
5962 N_("inexact rename detection was skipped due to too many files.");
5963
5964 static const char degrade_cc_to_c_warning[] =
5965 N_("only found copies from modified paths due to too many files.");
5966
5967 static const char rename_limit_advice[] =
5968 N_("you may want to set your %s variable to at least "
5969 "%d and retry the command.");
5970
5971 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5972 {
5973 fflush(stdout);
5974 if (degraded_cc)
5975 warning(_(degrade_cc_to_c_warning));
5976 else if (needed)
5977 warning(_(rename_limit_warning));
5978 else
5979 return;
5980 if (0 < needed)
5981 warning(_(rename_limit_advice), varname, needed);
5982 }
5983
5984 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5985 {
5986 int i;
5987 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5988 struct diff_queue_struct *q = &diff_queued_diff;
5989
5990 if (WSEH_NEW & WS_RULE_MASK)
5991 BUG("WS rules bit mask overlaps with diff symbol flags");
5992
5993 if (o->color_moved)
5994 o->emitted_symbols = &esm;
5995
5996 for (i = 0; i < q->nr; i++) {
5997 struct diff_filepair *p = q->queue[i];
5998 if (check_pair_status(p))
5999 diff_flush_patch(p, o);
6000 }
6001
6002 if (o->emitted_symbols) {
6003 if (o->color_moved) {
6004 struct hashmap add_lines, del_lines;
6005
6006 if (o->color_moved_ws_handling &
6007 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
6008 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
6009
6010 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
6011 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
6012
6013 add_lines_to_move_detection(o, &add_lines, &del_lines);
6014 mark_color_as_moved(o, &add_lines, &del_lines);
6015 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6016 dim_moved_lines(o);
6017
6018 hashmap_free(&add_lines, 1);
6019 hashmap_free(&del_lines, 1);
6020 }
6021
6022 for (i = 0; i < esm.nr; i++)
6023 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6024
6025 for (i = 0; i < esm.nr; i++)
6026 free((void *)esm.buf[i].line);
6027 }
6028 esm.nr = 0;
6029 }
6030
6031 void diff_flush(struct diff_options *options)
6032 {
6033 struct diff_queue_struct *q = &diff_queued_diff;
6034 int i, output_format = options->output_format;
6035 int separator = 0;
6036 int dirstat_by_line = 0;
6037
6038 /*
6039 * Order: raw, stat, summary, patch
6040 * or: name/name-status/checkdiff (other bits clear)
6041 */
6042 if (!q->nr)
6043 goto free_queue;
6044
6045 if (output_format & (DIFF_FORMAT_RAW |
6046 DIFF_FORMAT_NAME |
6047 DIFF_FORMAT_NAME_STATUS |
6048 DIFF_FORMAT_CHECKDIFF)) {
6049 for (i = 0; i < q->nr; i++) {
6050 struct diff_filepair *p = q->queue[i];
6051 if (check_pair_status(p))
6052 flush_one_pair(p, options);
6053 }
6054 separator++;
6055 }
6056
6057 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
6058 dirstat_by_line = 1;
6059
6060 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6061 dirstat_by_line) {
6062 struct diffstat_t diffstat;
6063
6064 memset(&diffstat, 0, sizeof(struct diffstat_t));
6065 for (i = 0; i < q->nr; i++) {
6066 struct diff_filepair *p = q->queue[i];
6067 if (check_pair_status(p))
6068 diff_flush_stat(p, options, &diffstat);
6069 }
6070 if (output_format & DIFF_FORMAT_NUMSTAT)
6071 show_numstat(&diffstat, options);
6072 if (output_format & DIFF_FORMAT_DIFFSTAT)
6073 show_stats(&diffstat, options);
6074 if (output_format & DIFF_FORMAT_SHORTSTAT)
6075 show_shortstats(&diffstat, options);
6076 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
6077 show_dirstat_by_line(&diffstat, options);
6078 free_diffstat_info(&diffstat);
6079 separator++;
6080 }
6081 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
6082 show_dirstat(options);
6083
6084 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
6085 for (i = 0; i < q->nr; i++) {
6086 diff_summary(options, q->queue[i]);
6087 }
6088 separator++;
6089 }
6090
6091 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
6092 options->flags.exit_with_status &&
6093 options->flags.diff_from_contents) {
6094 /*
6095 * run diff_flush_patch for the exit status. setting
6096 * options->file to /dev/null should be safe, because we
6097 * aren't supposed to produce any output anyway.
6098 */
6099 if (options->close_file)
6100 fclose(options->file);
6101 options->file = xfopen("/dev/null", "w");
6102 options->close_file = 1;
6103 options->color_moved = 0;
6104 for (i = 0; i < q->nr; i++) {
6105 struct diff_filepair *p = q->queue[i];
6106 if (check_pair_status(p))
6107 diff_flush_patch(p, options);
6108 if (options->found_changes)
6109 break;
6110 }
6111 }
6112
6113 if (output_format & DIFF_FORMAT_PATCH) {
6114 if (separator) {
6115 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
6116 if (options->stat_sep)
6117 /* attach patch instead of inline */
6118 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6119 NULL, 0, 0);
6120 }
6121
6122 diff_flush_patch_all_file_pairs(options);
6123 }
6124
6125 if (output_format & DIFF_FORMAT_CALLBACK)
6126 options->format_callback(q, options, options->format_callback_data);
6127
6128 for (i = 0; i < q->nr; i++)
6129 diff_free_filepair(q->queue[i]);
6130 free_queue:
6131 free(q->queue);
6132 DIFF_QUEUE_CLEAR(q);
6133 if (options->close_file)
6134 fclose(options->file);
6135
6136 /*
6137 * Report the content-level differences with HAS_CHANGES;
6138 * diff_addremove/diff_change does not set the bit when
6139 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6140 */
6141 if (options->flags.diff_from_contents) {
6142 if (options->found_changes)
6143 options->flags.has_changes = 1;
6144 else
6145 options->flags.has_changes = 0;
6146 }
6147 }
6148
6149 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6150 {
6151 return (((p->status == DIFF_STATUS_MODIFIED) &&
6152 ((p->score &&
6153 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6154 (!p->score &&
6155 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6156 ((p->status != DIFF_STATUS_MODIFIED) &&
6157 filter_bit_tst(p->status, options)));
6158 }
6159
6160 static void diffcore_apply_filter(struct diff_options *options)
6161 {
6162 int i;
6163 struct diff_queue_struct *q = &diff_queued_diff;
6164 struct diff_queue_struct outq;
6165
6166 DIFF_QUEUE_CLEAR(&outq);
6167
6168 if (!options->filter)
6169 return;
6170
6171 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6172 int found;
6173 for (i = found = 0; !found && i < q->nr; i++) {
6174 if (match_filter(options, q->queue[i]))
6175 found++;
6176 }
6177 if (found)
6178 return;
6179
6180 /* otherwise we will clear the whole queue
6181 * by copying the empty outq at the end of this
6182 * function, but first clear the current entries
6183 * in the queue.
6184 */
6185 for (i = 0; i < q->nr; i++)
6186 diff_free_filepair(q->queue[i]);
6187 }
6188 else {
6189 /* Only the matching ones */
6190 for (i = 0; i < q->nr; i++) {
6191 struct diff_filepair *p = q->queue[i];
6192 if (match_filter(options, p))
6193 diff_q(&outq, p);
6194 else
6195 diff_free_filepair(p);
6196 }
6197 }
6198 free(q->queue);
6199 *q = outq;
6200 }
6201
6202 /* Check whether two filespecs with the same mode and size are identical */
6203 static int diff_filespec_is_identical(struct repository *r,
6204 struct diff_filespec *one,
6205 struct diff_filespec *two)
6206 {
6207 if (S_ISGITLINK(one->mode))
6208 return 0;
6209 if (diff_populate_filespec(r, one, 0))
6210 return 0;
6211 if (diff_populate_filespec(r, two, 0))
6212 return 0;
6213 return !memcmp(one->data, two->data, one->size);
6214 }
6215
6216 static int diff_filespec_check_stat_unmatch(struct repository *r,
6217 struct diff_filepair *p)
6218 {
6219 if (p->done_skip_stat_unmatch)
6220 return p->skip_stat_unmatch_result;
6221
6222 p->done_skip_stat_unmatch = 1;
6223 p->skip_stat_unmatch_result = 0;
6224 /*
6225 * 1. Entries that come from stat info dirtiness
6226 * always have both sides (iow, not create/delete),
6227 * one side of the object name is unknown, with
6228 * the same mode and size. Keep the ones that
6229 * do not match these criteria. They have real
6230 * differences.
6231 *
6232 * 2. At this point, the file is known to be modified,
6233 * with the same mode and size, and the object
6234 * name of one side is unknown. Need to inspect
6235 * the identical contents.
6236 */
6237 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6238 !DIFF_FILE_VALID(p->two) ||
6239 (p->one->oid_valid && p->two->oid_valid) ||
6240 (p->one->mode != p->two->mode) ||
6241 diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
6242 diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
6243 (p->one->size != p->two->size) ||
6244 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6245 p->skip_stat_unmatch_result = 1;
6246 return p->skip_stat_unmatch_result;
6247 }
6248
6249 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6250 {
6251 int i;
6252 struct diff_queue_struct *q = &diff_queued_diff;
6253 struct diff_queue_struct outq;
6254 DIFF_QUEUE_CLEAR(&outq);
6255
6256 for (i = 0; i < q->nr; i++) {
6257 struct diff_filepair *p = q->queue[i];
6258
6259 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6260 diff_q(&outq, p);
6261 else {
6262 /*
6263 * The caller can subtract 1 from skip_stat_unmatch
6264 * to determine how many paths were dirty only
6265 * due to stat info mismatch.
6266 */
6267 if (!diffopt->flags.no_index)
6268 diffopt->skip_stat_unmatch++;
6269 diff_free_filepair(p);
6270 }
6271 }
6272 free(q->queue);
6273 *q = outq;
6274 }
6275
6276 static int diffnamecmp(const void *a_, const void *b_)
6277 {
6278 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6279 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6280 const char *name_a, *name_b;
6281
6282 name_a = a->one ? a->one->path : a->two->path;
6283 name_b = b->one ? b->one->path : b->two->path;
6284 return strcmp(name_a, name_b);
6285 }
6286
6287 void diffcore_fix_diff_index(struct diff_options *options)
6288 {
6289 struct diff_queue_struct *q = &diff_queued_diff;
6290 QSORT(q->queue, q->nr, diffnamecmp);
6291 }
6292
6293 void diffcore_std(struct diff_options *options)
6294 {
6295 /* NOTE please keep the following in sync with diff_tree_combined() */
6296 if (options->skip_stat_unmatch)
6297 diffcore_skip_stat_unmatch(options);
6298 if (!options->found_follow) {
6299 /* See try_to_follow_renames() in tree-diff.c */
6300 if (options->break_opt != -1)
6301 diffcore_break(options->repo,
6302 options->break_opt);
6303 if (options->detect_rename)
6304 diffcore_rename(options);
6305 if (options->break_opt != -1)
6306 diffcore_merge_broken();
6307 }
6308 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6309 diffcore_pickaxe(options);
6310 if (options->orderfile)
6311 diffcore_order(options->orderfile);
6312 if (!options->found_follow)
6313 /* See try_to_follow_renames() in tree-diff.c */
6314 diff_resolve_rename_copy();
6315 diffcore_apply_filter(options);
6316
6317 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6318 options->flags.has_changes = 1;
6319 else
6320 options->flags.has_changes = 0;
6321
6322 options->found_follow = 0;
6323 }
6324
6325 int diff_result_code(struct diff_options *opt, int status)
6326 {
6327 int result = 0;
6328
6329 diff_warn_rename_limit("diff.renameLimit",
6330 opt->needed_rename_limit,
6331 opt->degraded_cc_to_c);
6332 if (!opt->flags.exit_with_status &&
6333 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6334 return status;
6335 if (opt->flags.exit_with_status &&
6336 opt->flags.has_changes)
6337 result |= 01;
6338 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6339 opt->flags.check_failed)
6340 result |= 02;
6341 return result;
6342 }
6343
6344 int diff_can_quit_early(struct diff_options *opt)
6345 {
6346 return (opt->flags.quick &&
6347 !opt->filter &&
6348 opt->flags.has_changes);
6349 }
6350
6351 /*
6352 * Shall changes to this submodule be ignored?
6353 *
6354 * Submodule changes can be configured to be ignored separately for each path,
6355 * but that configuration can be overridden from the command line.
6356 */
6357 static int is_submodule_ignored(const char *path, struct diff_options *options)
6358 {
6359 int ignored = 0;
6360 struct diff_flags orig_flags = options->flags;
6361 if (!options->flags.override_submodule_config)
6362 set_diffopt_flags_from_submodule_config(options, path);
6363 if (options->flags.ignore_submodules)
6364 ignored = 1;
6365 options->flags = orig_flags;
6366 return ignored;
6367 }
6368
6369 void diff_addremove(struct diff_options *options,
6370 int addremove, unsigned mode,
6371 const struct object_id *oid,
6372 int oid_valid,
6373 const char *concatpath, unsigned dirty_submodule)
6374 {
6375 struct diff_filespec *one, *two;
6376
6377 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6378 return;
6379
6380 /* This may look odd, but it is a preparation for
6381 * feeding "there are unchanged files which should
6382 * not produce diffs, but when you are doing copy
6383 * detection you would need them, so here they are"
6384 * entries to the diff-core. They will be prefixed
6385 * with something like '=' or '*' (I haven't decided
6386 * which but should not make any difference).
6387 * Feeding the same new and old to diff_change()
6388 * also has the same effect.
6389 * Before the final output happens, they are pruned after
6390 * merged into rename/copy pairs as appropriate.
6391 */
6392 if (options->flags.reverse_diff)
6393 addremove = (addremove == '+' ? '-' :
6394 addremove == '-' ? '+' : addremove);
6395
6396 if (options->prefix &&
6397 strncmp(concatpath, options->prefix, options->prefix_length))
6398 return;
6399
6400 one = alloc_filespec(concatpath);
6401 two = alloc_filespec(concatpath);
6402
6403 if (addremove != '+')
6404 fill_filespec(one, oid, oid_valid, mode);
6405 if (addremove != '-') {
6406 fill_filespec(two, oid, oid_valid, mode);
6407 two->dirty_submodule = dirty_submodule;
6408 }
6409
6410 diff_queue(&diff_queued_diff, one, two);
6411 if (!options->flags.diff_from_contents)
6412 options->flags.has_changes = 1;
6413 }
6414
6415 void diff_change(struct diff_options *options,
6416 unsigned old_mode, unsigned new_mode,
6417 const struct object_id *old_oid,
6418 const struct object_id *new_oid,
6419 int old_oid_valid, int new_oid_valid,
6420 const char *concatpath,
6421 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6422 {
6423 struct diff_filespec *one, *two;
6424 struct diff_filepair *p;
6425
6426 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6427 is_submodule_ignored(concatpath, options))
6428 return;
6429
6430 if (options->flags.reverse_diff) {
6431 SWAP(old_mode, new_mode);
6432 SWAP(old_oid, new_oid);
6433 SWAP(old_oid_valid, new_oid_valid);
6434 SWAP(old_dirty_submodule, new_dirty_submodule);
6435 }
6436
6437 if (options->prefix &&
6438 strncmp(concatpath, options->prefix, options->prefix_length))
6439 return;
6440
6441 one = alloc_filespec(concatpath);
6442 two = alloc_filespec(concatpath);
6443 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6444 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6445 one->dirty_submodule = old_dirty_submodule;
6446 two->dirty_submodule = new_dirty_submodule;
6447 p = diff_queue(&diff_queued_diff, one, two);
6448
6449 if (options->flags.diff_from_contents)
6450 return;
6451
6452 if (options->flags.quick && options->skip_stat_unmatch &&
6453 !diff_filespec_check_stat_unmatch(options->repo, p))
6454 return;
6455
6456 options->flags.has_changes = 1;
6457 }
6458
6459 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6460 {
6461 struct diff_filepair *pair;
6462 struct diff_filespec *one, *two;
6463
6464 if (options->prefix &&
6465 strncmp(path, options->prefix, options->prefix_length))
6466 return NULL;
6467
6468 one = alloc_filespec(path);
6469 two = alloc_filespec(path);
6470 pair = diff_queue(&diff_queued_diff, one, two);
6471 pair->is_unmerged = 1;
6472 return pair;
6473 }
6474
6475 static char *run_textconv(struct repository *r,
6476 const char *pgm,
6477 struct diff_filespec *spec,
6478 size_t *outsize)
6479 {
6480 struct diff_tempfile *temp;
6481 const char *argv[3];
6482 const char **arg = argv;
6483 struct child_process child = CHILD_PROCESS_INIT;
6484 struct strbuf buf = STRBUF_INIT;
6485 int err = 0;
6486
6487 temp = prepare_temp_file(r, spec->path, spec);
6488 *arg++ = pgm;
6489 *arg++ = temp->name;
6490 *arg = NULL;
6491
6492 child.use_shell = 1;
6493 child.argv = argv;
6494 child.out = -1;
6495 if (start_command(&child)) {
6496 remove_tempfile();
6497 return NULL;
6498 }
6499
6500 if (strbuf_read(&buf, child.out, 0) < 0)
6501 err = error("error reading from textconv command '%s'", pgm);
6502 close(child.out);
6503
6504 if (finish_command(&child) || err) {
6505 strbuf_release(&buf);
6506 remove_tempfile();
6507 return NULL;
6508 }
6509 remove_tempfile();
6510
6511 return strbuf_detach(&buf, outsize);
6512 }
6513
6514 size_t fill_textconv(struct repository *r,
6515 struct userdiff_driver *driver,
6516 struct diff_filespec *df,
6517 char **outbuf)
6518 {
6519 size_t size;
6520
6521 if (!driver) {
6522 if (!DIFF_FILE_VALID(df)) {
6523 *outbuf = "";
6524 return 0;
6525 }
6526 if (diff_populate_filespec(r, df, 0))
6527 die("unable to read files to diff");
6528 *outbuf = df->data;
6529 return df->size;
6530 }
6531
6532 if (!driver->textconv)
6533 BUG("fill_textconv called with non-textconv driver");
6534
6535 if (driver->textconv_cache && df->oid_valid) {
6536 *outbuf = notes_cache_get(driver->textconv_cache,
6537 &df->oid,
6538 &size);
6539 if (*outbuf)
6540 return size;
6541 }
6542
6543 *outbuf = run_textconv(r, driver->textconv, df, &size);
6544 if (!*outbuf)
6545 die("unable to read files to diff");
6546
6547 if (driver->textconv_cache && df->oid_valid) {
6548 /* ignore errors, as we might be in a readonly repository */
6549 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6550 size);
6551 /*
6552 * we could save up changes and flush them all at the end,
6553 * but we would need an extra call after all diffing is done.
6554 * Since generating a cache entry is the slow path anyway,
6555 * this extra overhead probably isn't a big deal.
6556 */
6557 notes_cache_write(driver->textconv_cache);
6558 }
6559
6560 return size;
6561 }
6562
6563 int textconv_object(struct repository *r,
6564 const char *path,
6565 unsigned mode,
6566 const struct object_id *oid,
6567 int oid_valid,
6568 char **buf,
6569 unsigned long *buf_size)
6570 {
6571 struct diff_filespec *df;
6572 struct userdiff_driver *textconv;
6573
6574 df = alloc_filespec(path);
6575 fill_filespec(df, oid, oid_valid, mode);
6576 textconv = get_textconv(r, df);
6577 if (!textconv) {
6578 free_filespec(df);
6579 return 0;
6580 }
6581
6582 *buf_size = fill_textconv(r, textconv, df, buf);
6583 free_filespec(df);
6584 return 1;
6585 }
6586
6587 void setup_diff_pager(struct diff_options *opt)
6588 {
6589 /*
6590 * If the user asked for our exit code, then either they want --quiet
6591 * or --exit-code. We should definitely not bother with a pager in the
6592 * former case, as we will generate no output. Since we still properly
6593 * report our exit code even when a pager is run, we _could_ run a
6594 * pager with --exit-code. But since we have not done so historically,
6595 * and because it is easy to find people oneline advising "git diff
6596 * --exit-code" in hooks and other scripts, we do not do so.
6597 */
6598 if (!opt->flags.exit_with_status &&
6599 check_pager_config("diff") != 0)
6600 setup_pager();
6601 }
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