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debian: new upstream release
[git/debian.git] / diff.c
blobc862771a58939f0cd2a20b2056c8d93b17c7be26
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 "mem-pool.h"
22 #include "ll-merge.h"
23 #include "string-list.h"
24 #include "strvec.h"
25 #include "graph.h"
26 #include "packfile.h"
27 #include "parse-options.h"
28 #include "help.h"
29 #include "promisor-remote.h"
30 #include "dir.h"
31
32 #ifdef NO_FAST_WORKING_DIRECTORY
33 #define FAST_WORKING_DIRECTORY 0
34 #else
35 #define FAST_WORKING_DIRECTORY 1
36 #endif
37
38 static int diff_detect_rename_default;
39 static int diff_indent_heuristic = 1;
40 static int diff_rename_limit_default = 1000;
41 static int diff_suppress_blank_empty;
42 static int diff_use_color_default = -1;
43 static int diff_color_moved_default;
44 static int diff_color_moved_ws_default;
45 static int diff_context_default = 3;
46 static int diff_interhunk_context_default;
47 static const char *diff_word_regex_cfg;
48 static const char *external_diff_cmd_cfg;
49 static const char *diff_order_file_cfg;
50 int diff_auto_refresh_index = 1;
51 static int diff_mnemonic_prefix;
52 static int diff_no_prefix;
53 static int diff_relative;
54 static int diff_stat_graph_width;
55 static int diff_dirstat_permille_default = 30;
56 static struct diff_options default_diff_options;
57 static long diff_algorithm;
58 static unsigned ws_error_highlight_default = WSEH_NEW;
59
60 static char diff_colors[][COLOR_MAXLEN] = {
61 GIT_COLOR_RESET,
62 GIT_COLOR_NORMAL, /* CONTEXT */
63 GIT_COLOR_BOLD, /* METAINFO */
64 GIT_COLOR_CYAN, /* FRAGINFO */
65 GIT_COLOR_RED, /* OLD */
66 GIT_COLOR_GREEN, /* NEW */
67 GIT_COLOR_YELLOW, /* COMMIT */
68 GIT_COLOR_BG_RED, /* WHITESPACE */
69 GIT_COLOR_NORMAL, /* FUNCINFO */
70 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
71 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
72 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
73 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
74 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
75 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
76 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
77 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
78 GIT_COLOR_FAINT, /* CONTEXT_DIM */
79 GIT_COLOR_FAINT_RED, /* OLD_DIM */
80 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
81 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
82 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
83 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
84 };
85
86 static const char *color_diff_slots[] = {
87 [DIFF_CONTEXT] = "context",
88 [DIFF_METAINFO] = "meta",
89 [DIFF_FRAGINFO] = "frag",
90 [DIFF_FILE_OLD] = "old",
91 [DIFF_FILE_NEW] = "new",
92 [DIFF_COMMIT] = "commit",
93 [DIFF_WHITESPACE] = "whitespace",
94 [DIFF_FUNCINFO] = "func",
95 [DIFF_FILE_OLD_MOVED] = "oldMoved",
96 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
97 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
98 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
99 [DIFF_FILE_NEW_MOVED] = "newMoved",
100 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
101 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
102 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
103 [DIFF_CONTEXT_DIM] = "contextDimmed",
104 [DIFF_FILE_OLD_DIM] = "oldDimmed",
105 [DIFF_FILE_NEW_DIM] = "newDimmed",
106 [DIFF_CONTEXT_BOLD] = "contextBold",
107 [DIFF_FILE_OLD_BOLD] = "oldBold",
108 [DIFF_FILE_NEW_BOLD] = "newBold",
109 };
110
111 define_list_config_array_extra(color_diff_slots, {"plain"});
112
113 static int parse_diff_color_slot(const char *var)
114 {
115 if (!strcasecmp(var, "plain"))
116 return DIFF_CONTEXT;
117 return LOOKUP_CONFIG(color_diff_slots, var);
118 }
119
120 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
121 struct strbuf *errmsg)
122 {
123 char *params_copy = xstrdup(params_string);
124 struct string_list params = STRING_LIST_INIT_NODUP;
125 int ret = 0;
126 int i;
127
128 if (*params_copy)
129 string_list_split_in_place(&params, params_copy, ',', -1);
130 for (i = 0; i < params.nr; i++) {
131 const char *p = params.items[i].string;
132 if (!strcmp(p, "changes")) {
133 options->flags.dirstat_by_line = 0;
134 options->flags.dirstat_by_file = 0;
135 } else if (!strcmp(p, "lines")) {
136 options->flags.dirstat_by_line = 1;
137 options->flags.dirstat_by_file = 0;
138 } else if (!strcmp(p, "files")) {
139 options->flags.dirstat_by_line = 0;
140 options->flags.dirstat_by_file = 1;
141 } else if (!strcmp(p, "noncumulative")) {
142 options->flags.dirstat_cumulative = 0;
143 } else if (!strcmp(p, "cumulative")) {
144 options->flags.dirstat_cumulative = 1;
145 } else if (isdigit(*p)) {
146 char *end;
147 int permille = strtoul(p, &end, 10) * 10;
148 if (*end == '.' && isdigit(*++end)) {
149 /* only use first digit */
150 permille += *end - '0';
151 /* .. and ignore any further digits */
152 while (isdigit(*++end))
153 ; /* nothing */
154 }
155 if (!*end)
156 options->dirstat_permille = permille;
157 else {
158 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
159 p);
160 ret++;
161 }
162 } else {
163 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
164 ret++;
165 }
166
167 }
168 string_list_clear(&params, 0);
169 free(params_copy);
170 return ret;
171 }
172
173 static int parse_submodule_params(struct diff_options *options, const char *value)
174 {
175 if (!strcmp(value, "log"))
176 options->submodule_format = DIFF_SUBMODULE_LOG;
177 else if (!strcmp(value, "short"))
178 options->submodule_format = DIFF_SUBMODULE_SHORT;
179 else if (!strcmp(value, "diff"))
180 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
181 /*
182 * Please update $__git_diff_submodule_formats in
183 * git-completion.bash when you add new formats.
184 */
185 else
186 return -1;
187 return 0;
188 }
189
190 int git_config_rename(const char *var, const char *value)
191 {
192 if (!value)
193 return DIFF_DETECT_RENAME;
194 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
195 return DIFF_DETECT_COPY;
196 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
197 }
198
199 long parse_algorithm_value(const char *value)
200 {
201 if (!value)
202 return -1;
203 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
204 return 0;
205 else if (!strcasecmp(value, "minimal"))
206 return XDF_NEED_MINIMAL;
207 else if (!strcasecmp(value, "patience"))
208 return XDF_PATIENCE_DIFF;
209 else if (!strcasecmp(value, "histogram"))
210 return XDF_HISTOGRAM_DIFF;
211 /*
212 * Please update $__git_diff_algorithms in git-completion.bash
213 * when you add new algorithms.
214 */
215 return -1;
216 }
217
218 static int parse_one_token(const char **arg, const char *token)
219 {
220 const char *rest;
221 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
222 *arg = rest;
223 return 1;
224 }
225 return 0;
226 }
227
228 static int parse_ws_error_highlight(const char *arg)
229 {
230 const char *orig_arg = arg;
231 unsigned val = 0;
232
233 while (*arg) {
234 if (parse_one_token(&arg, "none"))
235 val = 0;
236 else if (parse_one_token(&arg, "default"))
237 val = WSEH_NEW;
238 else if (parse_one_token(&arg, "all"))
239 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
240 else if (parse_one_token(&arg, "new"))
241 val |= WSEH_NEW;
242 else if (parse_one_token(&arg, "old"))
243 val |= WSEH_OLD;
244 else if (parse_one_token(&arg, "context"))
245 val |= WSEH_CONTEXT;
246 else {
247 return -1 - (int)(arg - orig_arg);
248 }
249 if (*arg)
250 arg++;
251 }
252 return val;
253 }
254
255 /*
256 * These are to give UI layer defaults.
257 * The core-level commands such as git-diff-files should
258 * never be affected by the setting of diff.renames
259 * the user happens to have in the configuration file.
260 */
261 void init_diff_ui_defaults(void)
262 {
263 diff_detect_rename_default = DIFF_DETECT_RENAME;
264 }
265
266 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
267 {
268 if (!strcmp(var, "diff.indentheuristic"))
269 diff_indent_heuristic = git_config_bool(var, value);
270 return 0;
271 }
272
273 static int parse_color_moved(const char *arg)
274 {
275 switch (git_parse_maybe_bool(arg)) {
276 case 0:
277 return COLOR_MOVED_NO;
278 case 1:
279 return COLOR_MOVED_DEFAULT;
280 default:
281 break;
282 }
283
284 if (!strcmp(arg, "no"))
285 return COLOR_MOVED_NO;
286 else if (!strcmp(arg, "plain"))
287 return COLOR_MOVED_PLAIN;
288 else if (!strcmp(arg, "blocks"))
289 return COLOR_MOVED_BLOCKS;
290 else if (!strcmp(arg, "zebra"))
291 return COLOR_MOVED_ZEBRA;
292 else if (!strcmp(arg, "default"))
293 return COLOR_MOVED_DEFAULT;
294 else if (!strcmp(arg, "dimmed-zebra"))
295 return COLOR_MOVED_ZEBRA_DIM;
296 else if (!strcmp(arg, "dimmed_zebra"))
297 return COLOR_MOVED_ZEBRA_DIM;
298 else
299 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
300 }
301
302 static unsigned parse_color_moved_ws(const char *arg)
303 {
304 int ret = 0;
305 struct string_list l = STRING_LIST_INIT_DUP;
306 struct string_list_item *i;
307
308 string_list_split(&l, arg, ',', -1);
309
310 for_each_string_list_item(i, &l) {
311 struct strbuf sb = STRBUF_INIT;
312 strbuf_addstr(&sb, i->string);
313 strbuf_trim(&sb);
314
315 if (!strcmp(sb.buf, "no"))
316 ret = 0;
317 else if (!strcmp(sb.buf, "ignore-space-change"))
318 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
319 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
320 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
321 else if (!strcmp(sb.buf, "ignore-all-space"))
322 ret |= XDF_IGNORE_WHITESPACE;
323 else if (!strcmp(sb.buf, "allow-indentation-change"))
324 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
325 else {
326 ret |= COLOR_MOVED_WS_ERROR;
327 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);
328 }
329
330 strbuf_release(&sb);
331 }
332
333 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
334 (ret & XDF_WHITESPACE_FLAGS)) {
335 error(_("color-moved-ws: allow-indentation-change cannot be combined with other whitespace modes"));
336 ret |= COLOR_MOVED_WS_ERROR;
337 }
338
339 string_list_clear(&l, 0);
340
341 return ret;
342 }
343
344 int git_diff_ui_config(const char *var, const char *value, void *cb)
345 {
346 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
347 diff_use_color_default = git_config_colorbool(var, value);
348 return 0;
349 }
350 if (!strcmp(var, "diff.colormoved")) {
351 int cm = parse_color_moved(value);
352 if (cm < 0)
353 return -1;
354 diff_color_moved_default = cm;
355 return 0;
356 }
357 if (!strcmp(var, "diff.colormovedws")) {
358 unsigned cm = parse_color_moved_ws(value);
359 if (cm & COLOR_MOVED_WS_ERROR)
360 return -1;
361 diff_color_moved_ws_default = cm;
362 return 0;
363 }
364 if (!strcmp(var, "diff.context")) {
365 diff_context_default = git_config_int(var, value);
366 if (diff_context_default < 0)
367 return -1;
368 return 0;
369 }
370 if (!strcmp(var, "diff.interhunkcontext")) {
371 diff_interhunk_context_default = git_config_int(var, value);
372 if (diff_interhunk_context_default < 0)
373 return -1;
374 return 0;
375 }
376 if (!strcmp(var, "diff.renames")) {
377 diff_detect_rename_default = git_config_rename(var, value);
378 return 0;
379 }
380 if (!strcmp(var, "diff.autorefreshindex")) {
381 diff_auto_refresh_index = git_config_bool(var, value);
382 return 0;
383 }
384 if (!strcmp(var, "diff.mnemonicprefix")) {
385 diff_mnemonic_prefix = git_config_bool(var, value);
386 return 0;
387 }
388 if (!strcmp(var, "diff.noprefix")) {
389 diff_no_prefix = git_config_bool(var, value);
390 return 0;
391 }
392 if (!strcmp(var, "diff.relative")) {
393 diff_relative = git_config_bool(var, value);
394 return 0;
395 }
396 if (!strcmp(var, "diff.statgraphwidth")) {
397 diff_stat_graph_width = git_config_int(var, value);
398 return 0;
399 }
400 if (!strcmp(var, "diff.external"))
401 return git_config_string(&external_diff_cmd_cfg, var, value);
402 if (!strcmp(var, "diff.wordregex"))
403 return git_config_string(&diff_word_regex_cfg, var, value);
404 if (!strcmp(var, "diff.orderfile"))
405 return git_config_pathname(&diff_order_file_cfg, var, value);
406
407 if (!strcmp(var, "diff.ignoresubmodules"))
408 handle_ignore_submodules_arg(&default_diff_options, value);
409
410 if (!strcmp(var, "diff.submodule")) {
411 if (parse_submodule_params(&default_diff_options, value))
412 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
413 value);
414 return 0;
415 }
416
417 if (!strcmp(var, "diff.algorithm")) {
418 diff_algorithm = parse_algorithm_value(value);
419 if (diff_algorithm < 0)
420 return -1;
421 return 0;
422 }
423
424 if (git_color_config(var, value, cb) < 0)
425 return -1;
426
427 return git_diff_basic_config(var, value, cb);
428 }
429
430 int git_diff_basic_config(const char *var, const char *value, void *cb)
431 {
432 const char *name;
433
434 if (!strcmp(var, "diff.renamelimit")) {
435 diff_rename_limit_default = git_config_int(var, value);
436 return 0;
437 }
438
439 if (userdiff_config(var, value) < 0)
440 return -1;
441
442 if (skip_prefix(var, "diff.color.", &name) ||
443 skip_prefix(var, "color.diff.", &name)) {
444 int slot = parse_diff_color_slot(name);
445 if (slot < 0)
446 return 0;
447 if (!value)
448 return config_error_nonbool(var);
449 return color_parse(value, diff_colors[slot]);
450 }
451
452 if (!strcmp(var, "diff.wserrorhighlight")) {
453 int val = parse_ws_error_highlight(value);
454 if (val < 0)
455 return -1;
456 ws_error_highlight_default = val;
457 return 0;
458 }
459
460 /* like GNU diff's --suppress-blank-empty option */
461 if (!strcmp(var, "diff.suppressblankempty") ||
462 /* for backwards compatibility */
463 !strcmp(var, "diff.suppress-blank-empty")) {
464 diff_suppress_blank_empty = git_config_bool(var, value);
465 return 0;
466 }
467
468 if (!strcmp(var, "diff.dirstat")) {
469 struct strbuf errmsg = STRBUF_INIT;
470 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
471 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
472 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
473 errmsg.buf);
474 strbuf_release(&errmsg);
475 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
476 return 0;
477 }
478
479 if (git_diff_heuristic_config(var, value, cb) < 0)
480 return -1;
481
482 return git_default_config(var, value, cb);
483 }
484
485 static char *quote_two(const char *one, const char *two)
486 {
487 int need_one = quote_c_style(one, NULL, NULL, CQUOTE_NODQ);
488 int need_two = quote_c_style(two, NULL, NULL, CQUOTE_NODQ);
489 struct strbuf res = STRBUF_INIT;
490
491 if (need_one + need_two) {
492 strbuf_addch(&res, '"');
493 quote_c_style(one, &res, NULL, CQUOTE_NODQ);
494 quote_c_style(two, &res, NULL, CQUOTE_NODQ);
495 strbuf_addch(&res, '"');
496 } else {
497 strbuf_addstr(&res, one);
498 strbuf_addstr(&res, two);
499 }
500 return strbuf_detach(&res, NULL);
501 }
502
503 static const char *external_diff(void)
504 {
505 static const char *external_diff_cmd = NULL;
506 static int done_preparing = 0;
507
508 if (done_preparing)
509 return external_diff_cmd;
510 external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
511 if (!external_diff_cmd)
512 external_diff_cmd = external_diff_cmd_cfg;
513 done_preparing = 1;
514 return external_diff_cmd;
515 }
516
517 /*
518 * Keep track of files used for diffing. Sometimes such an entry
519 * refers to a temporary file, sometimes to an existing file, and
520 * sometimes to "/dev/null".
521 */
522 static struct diff_tempfile {
523 /*
524 * filename external diff should read from, or NULL if this
525 * entry is currently not in use:
526 */
527 const char *name;
528
529 char hex[GIT_MAX_HEXSZ + 1];
530 char mode[10];
531
532 /*
533 * If this diff_tempfile instance refers to a temporary file,
534 * this tempfile object is used to manage its lifetime.
535 */
536 struct tempfile *tempfile;
537 } diff_temp[2];
538
539 struct emit_callback {
540 int color_diff;
541 unsigned ws_rule;
542 int blank_at_eof_in_preimage;
543 int blank_at_eof_in_postimage;
544 int lno_in_preimage;
545 int lno_in_postimage;
546 const char **label_path;
547 struct diff_words_data *diff_words;
548 struct diff_options *opt;
549 struct strbuf *header;
550 };
551
552 static int count_lines(const char *data, int size)
553 {
554 int count, ch, completely_empty = 1, nl_just_seen = 0;
555 count = 0;
556 while (0 < size--) {
557 ch = *data++;
558 if (ch == '\n') {
559 count++;
560 nl_just_seen = 1;
561 completely_empty = 0;
562 }
563 else {
564 nl_just_seen = 0;
565 completely_empty = 0;
566 }
567 }
568 if (completely_empty)
569 return 0;
570 if (!nl_just_seen)
571 count++; /* no trailing newline */
572 return count;
573 }
574
575 static int fill_mmfile(struct repository *r, mmfile_t *mf,
576 struct diff_filespec *one)
577 {
578 if (!DIFF_FILE_VALID(one)) {
579 mf->ptr = (char *)""; /* does not matter */
580 mf->size = 0;
581 return 0;
582 }
583 else if (diff_populate_filespec(r, one, NULL))
584 return -1;
585
586 mf->ptr = one->data;
587 mf->size = one->size;
588 return 0;
589 }
590
591 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
592 static unsigned long diff_filespec_size(struct repository *r,
593 struct diff_filespec *one)
594 {
595 struct diff_populate_filespec_options dpf_options = {
596 .check_size_only = 1,
597 };
598
599 if (!DIFF_FILE_VALID(one))
600 return 0;
601 diff_populate_filespec(r, one, &dpf_options);
602 return one->size;
603 }
604
605 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
606 {
607 char *ptr = mf->ptr;
608 long size = mf->size;
609 int cnt = 0;
610
611 if (!size)
612 return cnt;
613 ptr += size - 1; /* pointing at the very end */
614 if (*ptr != '\n')
615 ; /* incomplete line */
616 else
617 ptr--; /* skip the last LF */
618 while (mf->ptr < ptr) {
619 char *prev_eol;
620 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
621 if (*prev_eol == '\n')
622 break;
623 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
624 break;
625 cnt++;
626 ptr = prev_eol - 1;
627 }
628 return cnt;
629 }
630
631 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
632 struct emit_callback *ecbdata)
633 {
634 int l1, l2, at;
635 unsigned ws_rule = ecbdata->ws_rule;
636 l1 = count_trailing_blank(mf1, ws_rule);
637 l2 = count_trailing_blank(mf2, ws_rule);
638 if (l2 <= l1) {
639 ecbdata->blank_at_eof_in_preimage = 0;
640 ecbdata->blank_at_eof_in_postimage = 0;
641 return;
642 }
643 at = count_lines(mf1->ptr, mf1->size);
644 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
645
646 at = count_lines(mf2->ptr, mf2->size);
647 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
648 }
649
650 static void emit_line_0(struct diff_options *o,
651 const char *set_sign, const char *set, unsigned reverse, const char *reset,
652 int first, const char *line, int len)
653 {
654 int has_trailing_newline, has_trailing_carriage_return;
655 int needs_reset = 0; /* at the end of the line */
656 FILE *file = o->file;
657
658 fputs(diff_line_prefix(o), file);
659
660 has_trailing_newline = (len > 0 && line[len-1] == '\n');
661 if (has_trailing_newline)
662 len--;
663
664 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
665 if (has_trailing_carriage_return)
666 len--;
667
668 if (!len && !first)
669 goto end_of_line;
670
671 if (reverse && want_color(o->use_color)) {
672 fputs(GIT_COLOR_REVERSE, file);
673 needs_reset = 1;
674 }
675
676 if (set_sign) {
677 fputs(set_sign, file);
678 needs_reset = 1;
679 }
680
681 if (first)
682 fputc(first, file);
683
684 if (!len)
685 goto end_of_line;
686
687 if (set) {
688 if (set_sign && set != set_sign)
689 fputs(reset, file);
690 fputs(set, file);
691 needs_reset = 1;
692 }
693 fwrite(line, len, 1, file);
694 needs_reset = 1; /* 'line' may contain color codes. */
695
696 end_of_line:
697 if (needs_reset)
698 fputs(reset, file);
699 if (has_trailing_carriage_return)
700 fputc('\r', file);
701 if (has_trailing_newline)
702 fputc('\n', file);
703 }
704
705 static void emit_line(struct diff_options *o, const char *set, const char *reset,
706 const char *line, int len)
707 {
708 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
709 }
710
711 enum diff_symbol {
712 DIFF_SYMBOL_BINARY_DIFF_HEADER,
713 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
714 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
715 DIFF_SYMBOL_BINARY_DIFF_BODY,
716 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
717 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
718 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
719 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
720 DIFF_SYMBOL_STATS_LINE,
721 DIFF_SYMBOL_WORD_DIFF,
722 DIFF_SYMBOL_STAT_SEP,
723 DIFF_SYMBOL_SUMMARY,
724 DIFF_SYMBOL_SUBMODULE_ADD,
725 DIFF_SYMBOL_SUBMODULE_DEL,
726 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
727 DIFF_SYMBOL_SUBMODULE_MODIFIED,
728 DIFF_SYMBOL_SUBMODULE_HEADER,
729 DIFF_SYMBOL_SUBMODULE_ERROR,
730 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
731 DIFF_SYMBOL_REWRITE_DIFF,
732 DIFF_SYMBOL_BINARY_FILES,
733 DIFF_SYMBOL_HEADER,
734 DIFF_SYMBOL_FILEPAIR_PLUS,
735 DIFF_SYMBOL_FILEPAIR_MINUS,
736 DIFF_SYMBOL_WORDS_PORCELAIN,
737 DIFF_SYMBOL_WORDS,
738 DIFF_SYMBOL_CONTEXT,
739 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
740 DIFF_SYMBOL_PLUS,
741 DIFF_SYMBOL_MINUS,
742 DIFF_SYMBOL_NO_LF_EOF,
743 DIFF_SYMBOL_CONTEXT_FRAGINFO,
744 DIFF_SYMBOL_CONTEXT_MARKER,
745 DIFF_SYMBOL_SEPARATOR
746 };
747 /*
748 * Flags for content lines:
749 * 0..12 are whitespace rules
750 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
751 * 16 is marking if the line is blank at EOF
752 */
753 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
754 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
755 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
756 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
757 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
758
759 /*
760 * This struct is used when we need to buffer the output of the diff output.
761 *
762 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
763 * into the pre/post image file. This pointer could be a union with the
764 * line pointer. By storing an offset into the file instead of the literal line,
765 * we can decrease the memory footprint for the buffered output. At first we
766 * may want to only have indirection for the content lines, but we could also
767 * enhance the state for emitting prefabricated lines, e.g. the similarity
768 * score line or hunk/file headers would only need to store a number or path
769 * and then the output can be constructed later on depending on state.
770 */
771 struct emitted_diff_symbol {
772 const char *line;
773 int len;
774 int flags;
775 int indent_off; /* Offset to first non-whitespace character */
776 int indent_width; /* The visual width of the indentation */
777 unsigned id;
778 enum diff_symbol s;
779 };
780 #define EMITTED_DIFF_SYMBOL_INIT { 0 }
781
782 struct emitted_diff_symbols {
783 struct emitted_diff_symbol *buf;
784 int nr, alloc;
785 };
786 #define EMITTED_DIFF_SYMBOLS_INIT { 0 }
787
788 static void append_emitted_diff_symbol(struct diff_options *o,
789 struct emitted_diff_symbol *e)
790 {
791 struct emitted_diff_symbol *f;
792
793 ALLOC_GROW(o->emitted_symbols->buf,
794 o->emitted_symbols->nr + 1,
795 o->emitted_symbols->alloc);
796 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
797
798 memcpy(f, e, sizeof(struct emitted_diff_symbol));
799 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
800 }
801
802 struct moved_entry {
803 const struct emitted_diff_symbol *es;
804 struct moved_entry *next_line;
805 struct moved_entry *next_match;
806 };
807
808 struct moved_block {
809 struct moved_entry *match;
810 int wsd; /* The whitespace delta of this block */
811 };
812
813 #define INDENT_BLANKLINE INT_MIN
814
815 static void fill_es_indent_data(struct emitted_diff_symbol *es)
816 {
817 unsigned int off = 0, i;
818 int width = 0, tab_width = es->flags & WS_TAB_WIDTH_MASK;
819 const char *s = es->line;
820 const int len = es->len;
821
822 /* skip any \v \f \r at start of indentation */
823 while (s[off] == '\f' || s[off] == '\v' ||
824 (s[off] == '\r' && off < len - 1))
825 off++;
826
827 /* calculate the visual width of indentation */
828 while(1) {
829 if (s[off] == ' ') {
830 width++;
831 off++;
832 } else if (s[off] == '\t') {
833 width += tab_width - (width % tab_width);
834 while (s[++off] == '\t')
835 width += tab_width;
836 } else {
837 break;
838 }
839 }
840
841 /* check if this line is blank */
842 for (i = off; i < len; i++)
843 if (!isspace(s[i]))
844 break;
845
846 if (i == len) {
847 es->indent_width = INDENT_BLANKLINE;
848 es->indent_off = len;
849 } else {
850 es->indent_off = off;
851 es->indent_width = width;
852 }
853 }
854
855 static int compute_ws_delta(const struct emitted_diff_symbol *a,
856 const struct emitted_diff_symbol *b)
857 {
858 int a_width = a->indent_width,
859 b_width = b->indent_width;
860
861 if (a_width == INDENT_BLANKLINE && b_width == INDENT_BLANKLINE)
862 return INDENT_BLANKLINE;
863
864 return a_width - b_width;
865 }
866
867 static int cmp_in_block_with_wsd(const struct moved_entry *cur,
868 const struct emitted_diff_symbol *l,
869 struct moved_block *pmb)
870 {
871 int a_width = cur->es->indent_width, b_width = l->indent_width;
872 int delta;
873
874 /* The text of each line must match */
875 if (cur->es->id != l->id)
876 return 1;
877
878 /*
879 * If 'l' and 'cur' are both blank then we don't need to check the
880 * indent. We only need to check cur as we know the strings match.
881 * */
882 if (a_width == INDENT_BLANKLINE)
883 return 0;
884
885 /*
886 * The indent changes of the block are known and stored in pmb->wsd;
887 * however we need to check if the indent changes of the current line
888 * match those of the current block.
889 */
890 delta = b_width - a_width;
891
892 /*
893 * If the previous lines of this block were all blank then set its
894 * whitespace delta.
895 */
896 if (pmb->wsd == INDENT_BLANKLINE)
897 pmb->wsd = delta;
898
899 return delta != pmb->wsd;
900 }
901
902 struct interned_diff_symbol {
903 struct hashmap_entry ent;
904 struct emitted_diff_symbol *es;
905 };
906
907 static int interned_diff_symbol_cmp(const void *hashmap_cmp_fn_data,
908 const struct hashmap_entry *eptr,
909 const struct hashmap_entry *entry_or_key,
910 const void *keydata)
911 {
912 const struct diff_options *diffopt = hashmap_cmp_fn_data;
913 const struct emitted_diff_symbol *a, *b;
914 unsigned flags = diffopt->color_moved_ws_handling
915 & XDF_WHITESPACE_FLAGS;
916
917 a = container_of(eptr, const struct interned_diff_symbol, ent)->es;
918 b = container_of(entry_or_key, const struct interned_diff_symbol, ent)->es;
919
920 return !xdiff_compare_lines(a->line + a->indent_off,
921 a->len - a->indent_off,
922 b->line + b->indent_off,
923 b->len - b->indent_off, flags);
924 }
925
926 static void prepare_entry(struct diff_options *o, struct emitted_diff_symbol *l,
927 struct interned_diff_symbol *s)
928 {
929 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
930 unsigned int hash = xdiff_hash_string(l->line + l->indent_off,
931 l->len - l->indent_off, flags);
932
933 hashmap_entry_init(&s->ent, hash);
934 s->es = l;
935 }
936
937 struct moved_entry_list {
938 struct moved_entry *add, *del;
939 };
940
941 static struct moved_entry_list *add_lines_to_move_detection(struct diff_options *o,
942 struct mem_pool *entry_mem_pool)
943 {
944 struct moved_entry *prev_line = NULL;
945 struct mem_pool interned_pool;
946 struct hashmap interned_map;
947 struct moved_entry_list *entry_list = NULL;
948 size_t entry_list_alloc = 0;
949 unsigned id = 0;
950 int n;
951
952 hashmap_init(&interned_map, interned_diff_symbol_cmp, o, 8096);
953 mem_pool_init(&interned_pool, 1024 * 1024);
954
955 for (n = 0; n < o->emitted_symbols->nr; n++) {
956 struct interned_diff_symbol key;
957 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
958 struct interned_diff_symbol *s;
959 struct moved_entry *entry;
960
961 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS) {
962 prev_line = NULL;
963 continue;
964 }
965
966 if (o->color_moved_ws_handling &
967 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
968 fill_es_indent_data(l);
969
970 prepare_entry(o, l, &key);
971 s = hashmap_get_entry(&interned_map, &key, ent, &key.ent);
972 if (s) {
973 l->id = s->es->id;
974 } else {
975 l->id = id;
976 ALLOC_GROW_BY(entry_list, id, 1, entry_list_alloc);
977 hashmap_add(&interned_map,
978 memcpy(mem_pool_alloc(&interned_pool,
979 sizeof(key)),
980 &key, sizeof(key)));
981 }
982 entry = mem_pool_alloc(entry_mem_pool, sizeof(*entry));
983 entry->es = l;
984 entry->next_line = NULL;
985 if (prev_line && prev_line->es->s == l->s)
986 prev_line->next_line = entry;
987 prev_line = entry;
988 if (l->s == DIFF_SYMBOL_PLUS) {
989 entry->next_match = entry_list[l->id].add;
990 entry_list[l->id].add = entry;
991 } else {
992 entry->next_match = entry_list[l->id].del;
993 entry_list[l->id].del = entry;
994 }
995 }
996
997 hashmap_clear(&interned_map);
998 mem_pool_discard(&interned_pool, 0);
999
1000 return entry_list;
1001 }
1002
1003 static void pmb_advance_or_null(struct diff_options *o,
1004 struct emitted_diff_symbol *l,
1005 struct moved_block *pmb,
1006 int *pmb_nr)
1007 {
1008 int i, j;
1009
1010 for (i = 0, j = 0; i < *pmb_nr; i++) {
1011 int match;
1012 struct moved_entry *prev = pmb[i].match;
1013 struct moved_entry *cur = (prev && prev->next_line) ?
1014 prev->next_line : NULL;
1015
1016 if (o->color_moved_ws_handling &
1017 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1018 match = cur &&
1019 !cmp_in_block_with_wsd(cur, l, &pmb[i]);
1020 else
1021 match = cur && cur->es->id == l->id;
1022
1023 if (match) {
1024 pmb[j] = pmb[i];
1025 pmb[j++].match = cur;
1026 }
1027 }
1028 *pmb_nr = j;
1029 }
1030
1031 static void fill_potential_moved_blocks(struct diff_options *o,
1032 struct moved_entry *match,
1033 struct emitted_diff_symbol *l,
1034 struct moved_block **pmb_p,
1035 int *pmb_alloc_p, int *pmb_nr_p)
1036
1037 {
1038 struct moved_block *pmb = *pmb_p;
1039 int pmb_alloc = *pmb_alloc_p, pmb_nr = *pmb_nr_p;
1040
1041 /*
1042 * The current line is the start of a new block.
1043 * Setup the set of potential blocks.
1044 */
1045 for (; match; match = match->next_match) {
1046 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1047 if (o->color_moved_ws_handling &
1048 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1049 pmb[pmb_nr].wsd = compute_ws_delta(l, match->es);
1050 else
1051 pmb[pmb_nr].wsd = 0;
1052 pmb[pmb_nr++].match = match;
1053 }
1054
1055 *pmb_p = pmb;
1056 *pmb_alloc_p = pmb_alloc;
1057 *pmb_nr_p = pmb_nr;
1058 }
1059
1060 /*
1061 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1062 *
1063 * Otherwise, if the last block has fewer alphanumeric characters than
1064 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1065 * that block.
1066 *
1067 * The last block consists of the (n - block_length)'th line up to but not
1068 * including the nth line.
1069 *
1070 * Returns 0 if the last block is empty or is unset by this function, non zero
1071 * otherwise.
1072 *
1073 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1074 * Think of a way to unify them.
1075 */
1076 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1077 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1078 static int adjust_last_block(struct diff_options *o, int n, int block_length)
1079 {
1080 int i, alnum_count = 0;
1081 if (o->color_moved == COLOR_MOVED_PLAIN)
1082 return block_length;
1083 for (i = 1; i < block_length + 1; i++) {
1084 const char *c = o->emitted_symbols->buf[n - i].line;
1085 for (; *c; c++) {
1086 if (!isalnum(*c))
1087 continue;
1088 alnum_count++;
1089 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1090 return 1;
1091 }
1092 }
1093 for (i = 1; i < block_length + 1; i++)
1094 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK;
1095 return 0;
1096 }
1097
1098 /* Find blocks of moved code, delegate actual coloring decision to helper */
1099 static void mark_color_as_moved(struct diff_options *o,
1100 struct moved_entry_list *entry_list)
1101 {
1102 struct moved_block *pmb = NULL; /* potentially moved blocks */
1103 int pmb_nr = 0, pmb_alloc = 0;
1104 int n, flipped_block = 0, block_length = 0;
1105 enum diff_symbol moved_symbol = DIFF_SYMBOL_BINARY_DIFF_HEADER;
1106
1107
1108 for (n = 0; n < o->emitted_symbols->nr; n++) {
1109 struct moved_entry *match = NULL;
1110 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1111
1112 switch (l->s) {
1113 case DIFF_SYMBOL_PLUS:
1114 match = entry_list[l->id].del;
1115 break;
1116 case DIFF_SYMBOL_MINUS:
1117 match = entry_list[l->id].add;
1118 break;
1119 default:
1120 flipped_block = 0;
1121 }
1122
1123 if (pmb_nr && (!match || l->s != moved_symbol)) {
1124 if (!adjust_last_block(o, n, block_length) &&
1125 block_length > 1) {
1126 /*
1127 * Rewind in case there is another match
1128 * starting at the second line of the block
1129 */
1130 match = NULL;
1131 n -= block_length;
1132 }
1133 pmb_nr = 0;
1134 block_length = 0;
1135 flipped_block = 0;
1136 }
1137 if (!match) {
1138 moved_symbol = DIFF_SYMBOL_BINARY_DIFF_HEADER;
1139 continue;
1140 }
1141
1142 if (o->color_moved == COLOR_MOVED_PLAIN) {
1143 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1144 continue;
1145 }
1146
1147 pmb_advance_or_null(o, l, pmb, &pmb_nr);
1148
1149 if (pmb_nr == 0) {
1150 int contiguous = adjust_last_block(o, n, block_length);
1151
1152 if (!contiguous && block_length > 1)
1153 /*
1154 * Rewind in case there is another match
1155 * starting at the second line of the block
1156 */
1157 n -= block_length;
1158 else
1159 fill_potential_moved_blocks(o, match, l,
1160 &pmb, &pmb_alloc,
1161 &pmb_nr);
1162
1163 if (contiguous && pmb_nr && moved_symbol == l->s)
1164 flipped_block = (flipped_block + 1) % 2;
1165 else
1166 flipped_block = 0;
1167
1168 if (pmb_nr)
1169 moved_symbol = l->s;
1170 else
1171 moved_symbol = DIFF_SYMBOL_BINARY_DIFF_HEADER;
1172
1173 block_length = 0;
1174 }
1175
1176 if (pmb_nr) {
1177 block_length++;
1178 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1179 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1180 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1181 }
1182 }
1183 adjust_last_block(o, n, block_length);
1184
1185 free(pmb);
1186 }
1187
1188 static void dim_moved_lines(struct diff_options *o)
1189 {
1190 int n;
1191 for (n = 0; n < o->emitted_symbols->nr; n++) {
1192 struct emitted_diff_symbol *prev = (n != 0) ?
1193 &o->emitted_symbols->buf[n - 1] : NULL;
1194 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1195 struct emitted_diff_symbol *next =
1196 (n < o->emitted_symbols->nr - 1) ?
1197 &o->emitted_symbols->buf[n + 1] : NULL;
1198
1199 /* Not a plus or minus line? */
1200 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1201 continue;
1202
1203 /* Not a moved line? */
1204 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1205 continue;
1206
1207 /*
1208 * If prev or next are not a plus or minus line,
1209 * pretend they don't exist
1210 */
1211 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1212 prev->s != DIFF_SYMBOL_MINUS)
1213 prev = NULL;
1214 if (next && next->s != DIFF_SYMBOL_PLUS &&
1215 next->s != DIFF_SYMBOL_MINUS)
1216 next = NULL;
1217
1218 /* Inside a block? */
1219 if ((prev &&
1220 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1221 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1222 (next &&
1223 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1224 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1225 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1226 continue;
1227 }
1228
1229 /* Check if we are at an interesting bound: */
1230 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1231 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1232 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1233 continue;
1234 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1235 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1236 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1237 continue;
1238
1239 /*
1240 * The boundary to prev and next are not interesting,
1241 * so this line is not interesting as a whole
1242 */
1243 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1244 }
1245 }
1246
1247 static void emit_line_ws_markup(struct diff_options *o,
1248 const char *set_sign, const char *set,
1249 const char *reset,
1250 int sign_index, const char *line, int len,
1251 unsigned ws_rule, int blank_at_eof)
1252 {
1253 const char *ws = NULL;
1254 int sign = o->output_indicators[sign_index];
1255
1256 if (o->ws_error_highlight & ws_rule) {
1257 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1258 if (!*ws)
1259 ws = NULL;
1260 }
1261
1262 if (!ws && !set_sign)
1263 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1264 else if (!ws) {
1265 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1266 } else if (blank_at_eof)
1267 /* Blank line at EOF - paint '+' as well */
1268 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1269 else {
1270 /* Emit just the prefix, then the rest. */
1271 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1272 sign, "", 0);
1273 ws_check_emit(line, len, ws_rule,
1274 o->file, set, reset, ws);
1275 }
1276 }
1277
1278 static void emit_diff_symbol_from_struct(struct diff_options *o,
1279 struct emitted_diff_symbol *eds)
1280 {
1281 static const char *nneof = " No newline at end of file\n";
1282 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1283 struct strbuf sb = STRBUF_INIT;
1284
1285 enum diff_symbol s = eds->s;
1286 const char *line = eds->line;
1287 int len = eds->len;
1288 unsigned flags = eds->flags;
1289
1290 switch (s) {
1291 case DIFF_SYMBOL_NO_LF_EOF:
1292 context = diff_get_color_opt(o, DIFF_CONTEXT);
1293 reset = diff_get_color_opt(o, DIFF_RESET);
1294 putc('\n', o->file);
1295 emit_line_0(o, context, NULL, 0, reset, '\\',
1296 nneof, strlen(nneof));
1297 break;
1298 case DIFF_SYMBOL_SUBMODULE_HEADER:
1299 case DIFF_SYMBOL_SUBMODULE_ERROR:
1300 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1301 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1302 case DIFF_SYMBOL_SUMMARY:
1303 case DIFF_SYMBOL_STATS_LINE:
1304 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1305 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1306 emit_line(o, "", "", line, len);
1307 break;
1308 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1309 case DIFF_SYMBOL_CONTEXT_MARKER:
1310 context = diff_get_color_opt(o, DIFF_CONTEXT);
1311 reset = diff_get_color_opt(o, DIFF_RESET);
1312 emit_line(o, context, reset, line, len);
1313 break;
1314 case DIFF_SYMBOL_SEPARATOR:
1315 fprintf(o->file, "%s%c",
1316 diff_line_prefix(o),
1317 o->line_termination);
1318 break;
1319 case DIFF_SYMBOL_CONTEXT:
1320 set = diff_get_color_opt(o, DIFF_CONTEXT);
1321 reset = diff_get_color_opt(o, DIFF_RESET);
1322 set_sign = NULL;
1323 if (o->flags.dual_color_diffed_diffs) {
1324 char c = !len ? 0 : line[0];
1325
1326 if (c == '+')
1327 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1328 else if (c == '@')
1329 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1330 else if (c == '-')
1331 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1332 }
1333 emit_line_ws_markup(o, set_sign, set, reset,
1334 OUTPUT_INDICATOR_CONTEXT, line, len,
1335 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1336 break;
1337 case DIFF_SYMBOL_PLUS:
1338 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1339 DIFF_SYMBOL_MOVED_LINE_ALT |
1340 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1341 case DIFF_SYMBOL_MOVED_LINE |
1342 DIFF_SYMBOL_MOVED_LINE_ALT |
1343 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1344 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1345 break;
1346 case DIFF_SYMBOL_MOVED_LINE |
1347 DIFF_SYMBOL_MOVED_LINE_ALT:
1348 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1349 break;
1350 case DIFF_SYMBOL_MOVED_LINE |
1351 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1352 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1353 break;
1354 case DIFF_SYMBOL_MOVED_LINE:
1355 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1356 break;
1357 default:
1358 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1359 }
1360 reset = diff_get_color_opt(o, DIFF_RESET);
1361 if (!o->flags.dual_color_diffed_diffs)
1362 set_sign = NULL;
1363 else {
1364 char c = !len ? 0 : line[0];
1365
1366 set_sign = set;
1367 if (c == '-')
1368 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1369 else if (c == '@')
1370 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1371 else if (c == '+')
1372 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1373 else
1374 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1375 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1376 }
1377 emit_line_ws_markup(o, set_sign, set, reset,
1378 OUTPUT_INDICATOR_NEW, line, len,
1379 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1380 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1381 break;
1382 case DIFF_SYMBOL_MINUS:
1383 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1384 DIFF_SYMBOL_MOVED_LINE_ALT |
1385 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1386 case DIFF_SYMBOL_MOVED_LINE |
1387 DIFF_SYMBOL_MOVED_LINE_ALT |
1388 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1389 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1390 break;
1391 case DIFF_SYMBOL_MOVED_LINE |
1392 DIFF_SYMBOL_MOVED_LINE_ALT:
1393 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1394 break;
1395 case DIFF_SYMBOL_MOVED_LINE |
1396 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1397 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1398 break;
1399 case DIFF_SYMBOL_MOVED_LINE:
1400 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1401 break;
1402 default:
1403 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1404 }
1405 reset = diff_get_color_opt(o, DIFF_RESET);
1406 if (!o->flags.dual_color_diffed_diffs)
1407 set_sign = NULL;
1408 else {
1409 char c = !len ? 0 : line[0];
1410
1411 set_sign = set;
1412 if (c == '+')
1413 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1414 else if (c == '@')
1415 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1416 else if (c == '-')
1417 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1418 else
1419 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1420 }
1421 emit_line_ws_markup(o, set_sign, set, reset,
1422 OUTPUT_INDICATOR_OLD, line, len,
1423 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1424 break;
1425 case DIFF_SYMBOL_WORDS_PORCELAIN:
1426 context = diff_get_color_opt(o, DIFF_CONTEXT);
1427 reset = diff_get_color_opt(o, DIFF_RESET);
1428 emit_line(o, context, reset, line, len);
1429 fputs("~\n", o->file);
1430 break;
1431 case DIFF_SYMBOL_WORDS:
1432 context = diff_get_color_opt(o, DIFF_CONTEXT);
1433 reset = diff_get_color_opt(o, DIFF_RESET);
1434 /*
1435 * Skip the prefix character, if any. With
1436 * diff_suppress_blank_empty, there may be
1437 * none.
1438 */
1439 if (line[0] != '\n') {
1440 line++;
1441 len--;
1442 }
1443 emit_line(o, context, reset, line, len);
1444 break;
1445 case DIFF_SYMBOL_FILEPAIR_PLUS:
1446 meta = diff_get_color_opt(o, DIFF_METAINFO);
1447 reset = diff_get_color_opt(o, DIFF_RESET);
1448 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1449 line, reset,
1450 strchr(line, ' ') ? "\t" : "");
1451 break;
1452 case DIFF_SYMBOL_FILEPAIR_MINUS:
1453 meta = diff_get_color_opt(o, DIFF_METAINFO);
1454 reset = diff_get_color_opt(o, DIFF_RESET);
1455 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1456 line, reset,
1457 strchr(line, ' ') ? "\t" : "");
1458 break;
1459 case DIFF_SYMBOL_BINARY_FILES:
1460 case DIFF_SYMBOL_HEADER:
1461 fprintf(o->file, "%s", line);
1462 break;
1463 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1464 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1465 break;
1466 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1467 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1468 break;
1469 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1470 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1471 break;
1472 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1473 fputs(diff_line_prefix(o), o->file);
1474 fputc('\n', o->file);
1475 break;
1476 case DIFF_SYMBOL_REWRITE_DIFF:
1477 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1478 reset = diff_get_color_opt(o, DIFF_RESET);
1479 emit_line(o, fraginfo, reset, line, len);
1480 break;
1481 case DIFF_SYMBOL_SUBMODULE_ADD:
1482 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1483 reset = diff_get_color_opt(o, DIFF_RESET);
1484 emit_line(o, set, reset, line, len);
1485 break;
1486 case DIFF_SYMBOL_SUBMODULE_DEL:
1487 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1488 reset = diff_get_color_opt(o, DIFF_RESET);
1489 emit_line(o, set, reset, line, len);
1490 break;
1491 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1492 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1493 diff_line_prefix(o), line);
1494 break;
1495 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1496 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1497 diff_line_prefix(o), line);
1498 break;
1499 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1500 emit_line(o, "", "", " 0 files changed\n",
1501 strlen(" 0 files changed\n"));
1502 break;
1503 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1504 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1505 break;
1506 case DIFF_SYMBOL_WORD_DIFF:
1507 fprintf(o->file, "%.*s", len, line);
1508 break;
1509 case DIFF_SYMBOL_STAT_SEP:
1510 fputs(o->stat_sep, o->file);
1511 break;
1512 default:
1513 BUG("unknown diff symbol");
1514 }
1515 strbuf_release(&sb);
1516 }
1517
1518 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1519 const char *line, int len, unsigned flags)
1520 {
1521 struct emitted_diff_symbol e = {
1522 .line = line, .len = len, .flags = flags, .s = s
1523 };
1524
1525 if (o->emitted_symbols)
1526 append_emitted_diff_symbol(o, &e);
1527 else
1528 emit_diff_symbol_from_struct(o, &e);
1529 }
1530
1531 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1532 {
1533 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1534 }
1535
1536 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1537 {
1538 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1539 }
1540
1541 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1542 {
1543 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1544 path, strlen(path), 0);
1545 }
1546
1547 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1548 {
1549 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1550 path, strlen(path), 0);
1551 }
1552
1553 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1554 {
1555 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1556 header, strlen(header), 0);
1557 }
1558
1559 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1560 {
1561 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1562 }
1563
1564 void diff_emit_submodule_pipethrough(struct diff_options *o,
1565 const char *line, int len)
1566 {
1567 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1568 }
1569
1570 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1571 {
1572 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1573 ecbdata->blank_at_eof_in_preimage &&
1574 ecbdata->blank_at_eof_in_postimage &&
1575 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1576 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1577 return 0;
1578 return ws_blank_line(line, len, ecbdata->ws_rule);
1579 }
1580
1581 static void emit_add_line(struct emit_callback *ecbdata,
1582 const char *line, int len)
1583 {
1584 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1585 if (new_blank_line_at_eof(ecbdata, line, len))
1586 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1587
1588 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1589 }
1590
1591 static void emit_del_line(struct emit_callback *ecbdata,
1592 const char *line, int len)
1593 {
1594 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1595 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1596 }
1597
1598 static void emit_context_line(struct emit_callback *ecbdata,
1599 const char *line, int len)
1600 {
1601 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1602 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1603 }
1604
1605 static void emit_hunk_header(struct emit_callback *ecbdata,
1606 const char *line, int len)
1607 {
1608 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1609 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1610 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1611 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1612 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1613 static const char atat[2] = { '@', '@' };
1614 const char *cp, *ep;
1615 struct strbuf msgbuf = STRBUF_INIT;
1616 int org_len = len;
1617 int i = 1;
1618
1619 /*
1620 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1621 * it always is at least 10 bytes long.
1622 */
1623 if (len < 10 ||
1624 memcmp(line, atat, 2) ||
1625 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1626 emit_diff_symbol(ecbdata->opt,
1627 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1628 return;
1629 }
1630 ep += 2; /* skip over @@ */
1631
1632 /* The hunk header in fraginfo color */
1633 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1634 strbuf_addstr(&msgbuf, reverse);
1635 strbuf_addstr(&msgbuf, frag);
1636 if (ecbdata->opt->flags.suppress_hunk_header_line_count)
1637 strbuf_add(&msgbuf, atat, sizeof(atat));
1638 else
1639 strbuf_add(&msgbuf, line, ep - line);
1640 strbuf_addstr(&msgbuf, reset);
1641
1642 /*
1643 * trailing "\r\n"
1644 */
1645 for ( ; i < 3; i++)
1646 if (line[len - i] == '\r' || line[len - i] == '\n')
1647 len--;
1648
1649 /* blank before the func header */
1650 for (cp = ep; ep - line < len; ep++)
1651 if (*ep != ' ' && *ep != '\t')
1652 break;
1653 if (ep != cp) {
1654 strbuf_addstr(&msgbuf, context);
1655 strbuf_add(&msgbuf, cp, ep - cp);
1656 strbuf_addstr(&msgbuf, reset);
1657 }
1658
1659 if (ep < line + len) {
1660 strbuf_addstr(&msgbuf, func);
1661 strbuf_add(&msgbuf, ep, line + len - ep);
1662 strbuf_addstr(&msgbuf, reset);
1663 }
1664
1665 strbuf_add(&msgbuf, line + len, org_len - len);
1666 strbuf_complete_line(&msgbuf);
1667 emit_diff_symbol(ecbdata->opt,
1668 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1669 strbuf_release(&msgbuf);
1670 }
1671
1672 static struct diff_tempfile *claim_diff_tempfile(void)
1673 {
1674 int i;
1675 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1676 if (!diff_temp[i].name)
1677 return diff_temp + i;
1678 BUG("diff is failing to clean up its tempfiles");
1679 }
1680
1681 static void remove_tempfile(void)
1682 {
1683 int i;
1684 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1685 if (is_tempfile_active(diff_temp[i].tempfile))
1686 delete_tempfile(&diff_temp[i].tempfile);
1687 diff_temp[i].name = NULL;
1688 }
1689 }
1690
1691 static void add_line_count(struct strbuf *out, int count)
1692 {
1693 switch (count) {
1694 case 0:
1695 strbuf_addstr(out, "0,0");
1696 break;
1697 case 1:
1698 strbuf_addstr(out, "1");
1699 break;
1700 default:
1701 strbuf_addf(out, "1,%d", count);
1702 break;
1703 }
1704 }
1705
1706 static void emit_rewrite_lines(struct emit_callback *ecb,
1707 int prefix, const char *data, int size)
1708 {
1709 const char *endp = NULL;
1710
1711 while (0 < size) {
1712 int len;
1713
1714 endp = memchr(data, '\n', size);
1715 len = endp ? (endp - data + 1) : size;
1716 if (prefix != '+') {
1717 ecb->lno_in_preimage++;
1718 emit_del_line(ecb, data, len);
1719 } else {
1720 ecb->lno_in_postimage++;
1721 emit_add_line(ecb, data, len);
1722 }
1723 size -= len;
1724 data += len;
1725 }
1726 if (!endp)
1727 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1728 }
1729
1730 static void emit_rewrite_diff(const char *name_a,
1731 const char *name_b,
1732 struct diff_filespec *one,
1733 struct diff_filespec *two,
1734 struct userdiff_driver *textconv_one,
1735 struct userdiff_driver *textconv_two,
1736 struct diff_options *o)
1737 {
1738 int lc_a, lc_b;
1739 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1740 const char *a_prefix, *b_prefix;
1741 char *data_one, *data_two;
1742 size_t size_one, size_two;
1743 struct emit_callback ecbdata;
1744 struct strbuf out = STRBUF_INIT;
1745
1746 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1747 a_prefix = o->b_prefix;
1748 b_prefix = o->a_prefix;
1749 } else {
1750 a_prefix = o->a_prefix;
1751 b_prefix = o->b_prefix;
1752 }
1753
1754 name_a += (*name_a == '/');
1755 name_b += (*name_b == '/');
1756
1757 strbuf_reset(&a_name);
1758 strbuf_reset(&b_name);
1759 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1760 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1761
1762 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1763 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1764
1765 memset(&ecbdata, 0, sizeof(ecbdata));
1766 ecbdata.color_diff = want_color(o->use_color);
1767 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1768 ecbdata.opt = o;
1769 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1770 mmfile_t mf1, mf2;
1771 mf1.ptr = (char *)data_one;
1772 mf2.ptr = (char *)data_two;
1773 mf1.size = size_one;
1774 mf2.size = size_two;
1775 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1776 }
1777 ecbdata.lno_in_preimage = 1;
1778 ecbdata.lno_in_postimage = 1;
1779
1780 lc_a = count_lines(data_one, size_one);
1781 lc_b = count_lines(data_two, size_two);
1782
1783 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1784 a_name.buf, a_name.len, 0);
1785 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1786 b_name.buf, b_name.len, 0);
1787
1788 strbuf_addstr(&out, "@@ -");
1789 if (!o->irreversible_delete)
1790 add_line_count(&out, lc_a);
1791 else
1792 strbuf_addstr(&out, "?,?");
1793 strbuf_addstr(&out, " +");
1794 add_line_count(&out, lc_b);
1795 strbuf_addstr(&out, " @@\n");
1796 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1797 strbuf_release(&out);
1798
1799 if (lc_a && !o->irreversible_delete)
1800 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1801 if (lc_b)
1802 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1803 if (textconv_one)
1804 free((char *)data_one);
1805 if (textconv_two)
1806 free((char *)data_two);
1807 }
1808
1809 struct diff_words_buffer {
1810 mmfile_t text;
1811 unsigned long alloc;
1812 struct diff_words_orig {
1813 const char *begin, *end;
1814 } *orig;
1815 int orig_nr, orig_alloc;
1816 };
1817
1818 static void diff_words_append(char *line, unsigned long len,
1819 struct diff_words_buffer *buffer)
1820 {
1821 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1822 line++;
1823 len--;
1824 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1825 buffer->text.size += len;
1826 buffer->text.ptr[buffer->text.size] = '\0';
1827 }
1828
1829 struct diff_words_style_elem {
1830 const char *prefix;
1831 const char *suffix;
1832 const char *color; /* NULL; filled in by the setup code if
1833 * color is enabled */
1834 };
1835
1836 struct diff_words_style {
1837 enum diff_words_type type;
1838 struct diff_words_style_elem new_word, old_word, ctx;
1839 const char *newline;
1840 };
1841
1842 static struct diff_words_style diff_words_styles[] = {
1843 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1844 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1845 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1846 };
1847
1848 struct diff_words_data {
1849 struct diff_words_buffer minus, plus;
1850 const char *current_plus;
1851 int last_minus;
1852 struct diff_options *opt;
1853 regex_t *word_regex;
1854 enum diff_words_type type;
1855 struct diff_words_style *style;
1856 };
1857
1858 static int fn_out_diff_words_write_helper(struct diff_options *o,
1859 struct diff_words_style_elem *st_el,
1860 const char *newline,
1861 size_t count, const char *buf)
1862 {
1863 int print = 0;
1864 struct strbuf sb = STRBUF_INIT;
1865
1866 while (count) {
1867 char *p = memchr(buf, '\n', count);
1868 if (print)
1869 strbuf_addstr(&sb, diff_line_prefix(o));
1870
1871 if (p != buf) {
1872 const char *reset = st_el->color && *st_el->color ?
1873 GIT_COLOR_RESET : NULL;
1874 if (st_el->color && *st_el->color)
1875 strbuf_addstr(&sb, st_el->color);
1876 strbuf_addstr(&sb, st_el->prefix);
1877 strbuf_add(&sb, buf, p ? p - buf : count);
1878 strbuf_addstr(&sb, st_el->suffix);
1879 if (reset)
1880 strbuf_addstr(&sb, reset);
1881 }
1882 if (!p)
1883 goto out;
1884
1885 strbuf_addstr(&sb, newline);
1886 count -= p + 1 - buf;
1887 buf = p + 1;
1888 print = 1;
1889 if (count) {
1890 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1891 sb.buf, sb.len, 0);
1892 strbuf_reset(&sb);
1893 }
1894 }
1895
1896 out:
1897 if (sb.len)
1898 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1899 sb.buf, sb.len, 0);
1900 strbuf_release(&sb);
1901 return 0;
1902 }
1903
1904 /*
1905 * '--color-words' algorithm can be described as:
1906 *
1907 * 1. collect the minus/plus lines of a diff hunk, divided into
1908 * minus-lines and plus-lines;
1909 *
1910 * 2. break both minus-lines and plus-lines into words and
1911 * place them into two mmfile_t with one word for each line;
1912 *
1913 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1914 *
1915 * And for the common parts of the both file, we output the plus side text.
1916 * diff_words->current_plus is used to trace the current position of the plus file
1917 * which printed. diff_words->last_minus is used to trace the last minus word
1918 * printed.
1919 *
1920 * For '--graph' to work with '--color-words', we need to output the graph prefix
1921 * on each line of color words output. Generally, there are two conditions on
1922 * which we should output the prefix.
1923 *
1924 * 1. diff_words->last_minus == 0 &&
1925 * diff_words->current_plus == diff_words->plus.text.ptr
1926 *
1927 * that is: the plus text must start as a new line, and if there is no minus
1928 * word printed, a graph prefix must be printed.
1929 *
1930 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1931 * *(diff_words->current_plus - 1) == '\n'
1932 *
1933 * that is: a graph prefix must be printed following a '\n'
1934 */
1935 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1936 {
1937 if ((diff_words->last_minus == 0 &&
1938 diff_words->current_plus == diff_words->plus.text.ptr) ||
1939 (diff_words->current_plus > diff_words->plus.text.ptr &&
1940 *(diff_words->current_plus - 1) == '\n')) {
1941 return 1;
1942 } else {
1943 return 0;
1944 }
1945 }
1946
1947 static void fn_out_diff_words_aux(void *priv,
1948 long minus_first, long minus_len,
1949 long plus_first, long plus_len,
1950 const char *func, long funclen)
1951 {
1952 struct diff_words_data *diff_words = priv;
1953 struct diff_words_style *style = diff_words->style;
1954 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1955 struct diff_options *opt = diff_words->opt;
1956 const char *line_prefix;
1957
1958 assert(opt);
1959 line_prefix = diff_line_prefix(opt);
1960
1961 /* POSIX requires that first be decremented by one if len == 0... */
1962 if (minus_len) {
1963 minus_begin = diff_words->minus.orig[minus_first].begin;
1964 minus_end =
1965 diff_words->minus.orig[minus_first + minus_len - 1].end;
1966 } else
1967 minus_begin = minus_end =
1968 diff_words->minus.orig[minus_first].end;
1969
1970 if (plus_len) {
1971 plus_begin = diff_words->plus.orig[plus_first].begin;
1972 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1973 } else
1974 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1975
1976 if (color_words_output_graph_prefix(diff_words)) {
1977 fputs(line_prefix, diff_words->opt->file);
1978 }
1979 if (diff_words->current_plus != plus_begin) {
1980 fn_out_diff_words_write_helper(diff_words->opt,
1981 &style->ctx, style->newline,
1982 plus_begin - diff_words->current_plus,
1983 diff_words->current_plus);
1984 }
1985 if (minus_begin != minus_end) {
1986 fn_out_diff_words_write_helper(diff_words->opt,
1987 &style->old_word, style->newline,
1988 minus_end - minus_begin, minus_begin);
1989 }
1990 if (plus_begin != plus_end) {
1991 fn_out_diff_words_write_helper(diff_words->opt,
1992 &style->new_word, style->newline,
1993 plus_end - plus_begin, plus_begin);
1994 }
1995
1996 diff_words->current_plus = plus_end;
1997 diff_words->last_minus = minus_first;
1998 }
1999
2000 /* This function starts looking at *begin, and returns 0 iff a word was found. */
2001 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
2002 int *begin, int *end)
2003 {
2004 while (word_regex && *begin < buffer->size) {
2005 regmatch_t match[1];
2006 if (!regexec_buf(word_regex, buffer->ptr + *begin,
2007 buffer->size - *begin, 1, match, 0)) {
2008 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
2009 '\n', match[0].rm_eo - match[0].rm_so);
2010 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
2011 *begin += match[0].rm_so;
2012 if (*begin == *end)
2013 (*begin)++;
2014 else
2015 return *begin > *end;
2016 } else {
2017 return -1;
2018 }
2019 }
2020
2021 /* find the next word */
2022 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
2023 (*begin)++;
2024 if (*begin >= buffer->size)
2025 return -1;
2026
2027 /* find the end of the word */
2028 *end = *begin + 1;
2029 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
2030 (*end)++;
2031
2032 return 0;
2033 }
2034
2035 /*
2036 * This function splits the words in buffer->text, stores the list with
2037 * newline separator into out, and saves the offsets of the original words
2038 * in buffer->orig.
2039 */
2040 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2041 regex_t *word_regex)
2042 {
2043 int i, j;
2044 long alloc = 0;
2045
2046 out->size = 0;
2047 out->ptr = NULL;
2048
2049 /* fake an empty "0th" word */
2050 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2051 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2052 buffer->orig_nr = 1;
2053
2054 for (i = 0; i < buffer->text.size; i++) {
2055 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2056 return;
2057
2058 /* store original boundaries */
2059 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2060 buffer->orig_alloc);
2061 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2062 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2063 buffer->orig_nr++;
2064
2065 /* store one word */
2066 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2067 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2068 out->ptr[out->size + j - i] = '\n';
2069 out->size += j - i + 1;
2070
2071 i = j - 1;
2072 }
2073 }
2074
2075 /* this executes the word diff on the accumulated buffers */
2076 static void diff_words_show(struct diff_words_data *diff_words)
2077 {
2078 xpparam_t xpp;
2079 xdemitconf_t xecfg;
2080 mmfile_t minus, plus;
2081 struct diff_words_style *style = diff_words->style;
2082
2083 struct diff_options *opt = diff_words->opt;
2084 const char *line_prefix;
2085
2086 assert(opt);
2087 line_prefix = diff_line_prefix(opt);
2088
2089 /* special case: only removal */
2090 if (!diff_words->plus.text.size) {
2091 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2092 line_prefix, strlen(line_prefix), 0);
2093 fn_out_diff_words_write_helper(diff_words->opt,
2094 &style->old_word, style->newline,
2095 diff_words->minus.text.size,
2096 diff_words->minus.text.ptr);
2097 diff_words->minus.text.size = 0;
2098 return;
2099 }
2100
2101 diff_words->current_plus = diff_words->plus.text.ptr;
2102 diff_words->last_minus = 0;
2103
2104 memset(&xpp, 0, sizeof(xpp));
2105 memset(&xecfg, 0, sizeof(xecfg));
2106 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2107 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2108 xpp.flags = 0;
2109 /* as only the hunk header will be parsed, we need a 0-context */
2110 xecfg.ctxlen = 0;
2111 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, NULL,
2112 diff_words, &xpp, &xecfg))
2113 die("unable to generate word diff");
2114 free(minus.ptr);
2115 free(plus.ptr);
2116 if (diff_words->current_plus != diff_words->plus.text.ptr +
2117 diff_words->plus.text.size) {
2118 if (color_words_output_graph_prefix(diff_words))
2119 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2120 line_prefix, strlen(line_prefix), 0);
2121 fn_out_diff_words_write_helper(diff_words->opt,
2122 &style->ctx, style->newline,
2123 diff_words->plus.text.ptr + diff_words->plus.text.size
2124 - diff_words->current_plus, diff_words->current_plus);
2125 }
2126 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2127 }
2128
2129 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2130 static void diff_words_flush(struct emit_callback *ecbdata)
2131 {
2132 struct diff_options *wo = ecbdata->diff_words->opt;
2133
2134 if (ecbdata->diff_words->minus.text.size ||
2135 ecbdata->diff_words->plus.text.size)
2136 diff_words_show(ecbdata->diff_words);
2137
2138 if (wo->emitted_symbols) {
2139 struct diff_options *o = ecbdata->opt;
2140 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2141 int i;
2142
2143 /*
2144 * NEEDSWORK:
2145 * Instead of appending each, concat all words to a line?
2146 */
2147 for (i = 0; i < wol->nr; i++)
2148 append_emitted_diff_symbol(o, &wol->buf[i]);
2149
2150 for (i = 0; i < wol->nr; i++)
2151 free((void *)wol->buf[i].line);
2152
2153 wol->nr = 0;
2154 }
2155 }
2156
2157 static void diff_filespec_load_driver(struct diff_filespec *one,
2158 struct index_state *istate)
2159 {
2160 /* Use already-loaded driver */
2161 if (one->driver)
2162 return;
2163
2164 if (S_ISREG(one->mode))
2165 one->driver = userdiff_find_by_path(istate, one->path);
2166
2167 /* Fallback to default settings */
2168 if (!one->driver)
2169 one->driver = userdiff_find_by_name("default");
2170 }
2171
2172 static const char *userdiff_word_regex(struct diff_filespec *one,
2173 struct index_state *istate)
2174 {
2175 diff_filespec_load_driver(one, istate);
2176 return one->driver->word_regex;
2177 }
2178
2179 static void init_diff_words_data(struct emit_callback *ecbdata,
2180 struct diff_options *orig_opts,
2181 struct diff_filespec *one,
2182 struct diff_filespec *two)
2183 {
2184 int i;
2185 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2186 memcpy(o, orig_opts, sizeof(struct diff_options));
2187
2188 CALLOC_ARRAY(ecbdata->diff_words, 1);
2189 ecbdata->diff_words->type = o->word_diff;
2190 ecbdata->diff_words->opt = o;
2191
2192 if (orig_opts->emitted_symbols)
2193 CALLOC_ARRAY(o->emitted_symbols, 1);
2194
2195 if (!o->word_regex)
2196 o->word_regex = userdiff_word_regex(one, o->repo->index);
2197 if (!o->word_regex)
2198 o->word_regex = userdiff_word_regex(two, o->repo->index);
2199 if (!o->word_regex)
2200 o->word_regex = diff_word_regex_cfg;
2201 if (o->word_regex) {
2202 ecbdata->diff_words->word_regex = (regex_t *)
2203 xmalloc(sizeof(regex_t));
2204 if (regcomp(ecbdata->diff_words->word_regex,
2205 o->word_regex,
2206 REG_EXTENDED | REG_NEWLINE))
2207 die("invalid regular expression: %s",
2208 o->word_regex);
2209 }
2210 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2211 if (o->word_diff == diff_words_styles[i].type) {
2212 ecbdata->diff_words->style =
2213 &diff_words_styles[i];
2214 break;
2215 }
2216 }
2217 if (want_color(o->use_color)) {
2218 struct diff_words_style *st = ecbdata->diff_words->style;
2219 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2220 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2221 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2222 }
2223 }
2224
2225 static void free_diff_words_data(struct emit_callback *ecbdata)
2226 {
2227 if (ecbdata->diff_words) {
2228 diff_words_flush(ecbdata);
2229 free (ecbdata->diff_words->opt->emitted_symbols);
2230 free (ecbdata->diff_words->opt);
2231 free (ecbdata->diff_words->minus.text.ptr);
2232 free (ecbdata->diff_words->minus.orig);
2233 free (ecbdata->diff_words->plus.text.ptr);
2234 free (ecbdata->diff_words->plus.orig);
2235 if (ecbdata->diff_words->word_regex) {
2236 regfree(ecbdata->diff_words->word_regex);
2237 free(ecbdata->diff_words->word_regex);
2238 }
2239 FREE_AND_NULL(ecbdata->diff_words);
2240 }
2241 }
2242
2243 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2244 {
2245 if (want_color(diff_use_color))
2246 return diff_colors[ix];
2247 return "";
2248 }
2249
2250 const char *diff_line_prefix(struct diff_options *opt)
2251 {
2252 struct strbuf *msgbuf;
2253 if (!opt->output_prefix)
2254 return "";
2255
2256 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2257 return msgbuf->buf;
2258 }
2259
2260 static unsigned long sane_truncate_line(char *line, unsigned long len)
2261 {
2262 const char *cp;
2263 unsigned long allot;
2264 size_t l = len;
2265
2266 cp = line;
2267 allot = l;
2268 while (0 < l) {
2269 (void) utf8_width(&cp, &l);
2270 if (!cp)
2271 break; /* truncated in the middle? */
2272 }
2273 return allot - l;
2274 }
2275
2276 static void find_lno(const char *line, struct emit_callback *ecbdata)
2277 {
2278 const char *p;
2279 ecbdata->lno_in_preimage = 0;
2280 ecbdata->lno_in_postimage = 0;
2281 p = strchr(line, '-');
2282 if (!p)
2283 return; /* cannot happen */
2284 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2285 p = strchr(p, '+');
2286 if (!p)
2287 return; /* cannot happen */
2288 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2289 }
2290
2291 static int fn_out_consume(void *priv, char *line, unsigned long len)
2292 {
2293 struct emit_callback *ecbdata = priv;
2294 struct diff_options *o = ecbdata->opt;
2295
2296 o->found_changes = 1;
2297
2298 if (ecbdata->header) {
2299 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2300 ecbdata->header->buf, ecbdata->header->len, 0);
2301 strbuf_reset(ecbdata->header);
2302 ecbdata->header = NULL;
2303 }
2304
2305 if (ecbdata->label_path[0]) {
2306 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2307 ecbdata->label_path[0],
2308 strlen(ecbdata->label_path[0]), 0);
2309 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2310 ecbdata->label_path[1],
2311 strlen(ecbdata->label_path[1]), 0);
2312 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2313 }
2314
2315 if (diff_suppress_blank_empty
2316 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2317 line[0] = '\n';
2318 len = 1;
2319 }
2320
2321 if (line[0] == '@') {
2322 if (ecbdata->diff_words)
2323 diff_words_flush(ecbdata);
2324 len = sane_truncate_line(line, len);
2325 find_lno(line, ecbdata);
2326 emit_hunk_header(ecbdata, line, len);
2327 return 0;
2328 }
2329
2330 if (ecbdata->diff_words) {
2331 enum diff_symbol s =
2332 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2333 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2334 if (line[0] == '-') {
2335 diff_words_append(line, len,
2336 &ecbdata->diff_words->minus);
2337 return 0;
2338 } else if (line[0] == '+') {
2339 diff_words_append(line, len,
2340 &ecbdata->diff_words->plus);
2341 return 0;
2342 } else if (starts_with(line, "\\ ")) {
2343 /*
2344 * Eat the "no newline at eof" marker as if we
2345 * saw a "+" or "-" line with nothing on it,
2346 * and return without diff_words_flush() to
2347 * defer processing. If this is the end of
2348 * preimage, more "+" lines may come after it.
2349 */
2350 return 0;
2351 }
2352 diff_words_flush(ecbdata);
2353 emit_diff_symbol(o, s, line, len, 0);
2354 return 0;
2355 }
2356
2357 switch (line[0]) {
2358 case '+':
2359 ecbdata->lno_in_postimage++;
2360 emit_add_line(ecbdata, line + 1, len - 1);
2361 break;
2362 case '-':
2363 ecbdata->lno_in_preimage++;
2364 emit_del_line(ecbdata, line + 1, len - 1);
2365 break;
2366 case ' ':
2367 ecbdata->lno_in_postimage++;
2368 ecbdata->lno_in_preimage++;
2369 emit_context_line(ecbdata, line + 1, len - 1);
2370 break;
2371 default:
2372 /* incomplete line at the end */
2373 ecbdata->lno_in_preimage++;
2374 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2375 line, len, 0);
2376 break;
2377 }
2378 return 0;
2379 }
2380
2381 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2382 {
2383 const char *old_name = a;
2384 const char *new_name = b;
2385 int pfx_length, sfx_length;
2386 int pfx_adjust_for_slash;
2387 int len_a = strlen(a);
2388 int len_b = strlen(b);
2389 int a_midlen, b_midlen;
2390 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2391 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2392
2393 if (qlen_a || qlen_b) {
2394 quote_c_style(a, name, NULL, 0);
2395 strbuf_addstr(name, " => ");
2396 quote_c_style(b, name, NULL, 0);
2397 return;
2398 }
2399
2400 /* Find common prefix */
2401 pfx_length = 0;
2402 while (*old_name && *new_name && *old_name == *new_name) {
2403 if (*old_name == '/')
2404 pfx_length = old_name - a + 1;
2405 old_name++;
2406 new_name++;
2407 }
2408
2409 /* Find common suffix */
2410 old_name = a + len_a;
2411 new_name = b + len_b;
2412 sfx_length = 0;
2413 /*
2414 * If there is a common prefix, it must end in a slash. In
2415 * that case we let this loop run 1 into the prefix to see the
2416 * same slash.
2417 *
2418 * If there is no common prefix, we cannot do this as it would
2419 * underrun the input strings.
2420 */
2421 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2422 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2423 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2424 *old_name == *new_name) {
2425 if (*old_name == '/')
2426 sfx_length = len_a - (old_name - a);
2427 old_name--;
2428 new_name--;
2429 }
2430
2431 /*
2432 * pfx{mid-a => mid-b}sfx
2433 * {pfx-a => pfx-b}sfx
2434 * pfx{sfx-a => sfx-b}
2435 * name-a => name-b
2436 */
2437 a_midlen = len_a - pfx_length - sfx_length;
2438 b_midlen = len_b - pfx_length - sfx_length;
2439 if (a_midlen < 0)
2440 a_midlen = 0;
2441 if (b_midlen < 0)
2442 b_midlen = 0;
2443
2444 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2445 if (pfx_length + sfx_length) {
2446 strbuf_add(name, a, pfx_length);
2447 strbuf_addch(name, '{');
2448 }
2449 strbuf_add(name, a + pfx_length, a_midlen);
2450 strbuf_addstr(name, " => ");
2451 strbuf_add(name, b + pfx_length, b_midlen);
2452 if (pfx_length + sfx_length) {
2453 strbuf_addch(name, '}');
2454 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2455 }
2456 }
2457
2458 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2459 const char *name_a,
2460 const char *name_b)
2461 {
2462 struct diffstat_file *x;
2463 CALLOC_ARRAY(x, 1);
2464 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2465 diffstat->files[diffstat->nr++] = x;
2466 if (name_b) {
2467 x->from_name = xstrdup(name_a);
2468 x->name = xstrdup(name_b);
2469 x->is_renamed = 1;
2470 }
2471 else {
2472 x->from_name = NULL;
2473 x->name = xstrdup(name_a);
2474 }
2475 return x;
2476 }
2477
2478 static int diffstat_consume(void *priv, char *line, unsigned long len)
2479 {
2480 struct diffstat_t *diffstat = priv;
2481 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2482
2483 if (line[0] == '+')
2484 x->added++;
2485 else if (line[0] == '-')
2486 x->deleted++;
2487 return 0;
2488 }
2489
2490 const char mime_boundary_leader[] = "------------";
2491
2492 static int scale_linear(int it, int width, int max_change)
2493 {
2494 if (!it)
2495 return 0;
2496 /*
2497 * make sure that at least one '-' or '+' is printed if
2498 * there is any change to this path. The easiest way is to
2499 * scale linearly as if the allotted width is one column shorter
2500 * than it is, and then add 1 to the result.
2501 */
2502 return 1 + (it * (width - 1) / max_change);
2503 }
2504
2505 static void show_graph(struct strbuf *out, char ch, int cnt,
2506 const char *set, const char *reset)
2507 {
2508 if (cnt <= 0)
2509 return;
2510 strbuf_addstr(out, set);
2511 strbuf_addchars(out, ch, cnt);
2512 strbuf_addstr(out, reset);
2513 }
2514
2515 static void fill_print_name(struct diffstat_file *file)
2516 {
2517 struct strbuf pname = STRBUF_INIT;
2518
2519 if (file->print_name)
2520 return;
2521
2522 if (file->is_renamed)
2523 pprint_rename(&pname, file->from_name, file->name);
2524 else
2525 quote_c_style(file->name, &pname, NULL, 0);
2526
2527 if (file->comments)
2528 strbuf_addf(&pname, " (%s)", file->comments);
2529
2530 file->print_name = strbuf_detach(&pname, NULL);
2531 }
2532
2533 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2534 int files, int insertions, int deletions)
2535 {
2536 struct strbuf sb = STRBUF_INIT;
2537
2538 if (!files) {
2539 assert(insertions == 0 && deletions == 0);
2540 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2541 NULL, 0, 0);
2542 return;
2543 }
2544
2545 strbuf_addf(&sb,
2546 (files == 1) ? " %d file changed" : " %d files changed",
2547 files);
2548
2549 /*
2550 * For binary diff, the caller may want to print "x files
2551 * changed" with insertions == 0 && deletions == 0.
2552 *
2553 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2554 * is probably less confusing (i.e skip over "2 files changed
2555 * but nothing about added/removed lines? Is this a bug in Git?").
2556 */
2557 if (insertions || deletions == 0) {
2558 strbuf_addf(&sb,
2559 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2560 insertions);
2561 }
2562
2563 if (deletions || insertions == 0) {
2564 strbuf_addf(&sb,
2565 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2566 deletions);
2567 }
2568 strbuf_addch(&sb, '\n');
2569 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2570 sb.buf, sb.len, 0);
2571 strbuf_release(&sb);
2572 }
2573
2574 void print_stat_summary(FILE *fp, int files,
2575 int insertions, int deletions)
2576 {
2577 struct diff_options o;
2578 memset(&o, 0, sizeof(o));
2579 o.file = fp;
2580
2581 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2582 }
2583
2584 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2585 {
2586 int i, len, add, del, adds = 0, dels = 0;
2587 uintmax_t max_change = 0, max_len = 0;
2588 int total_files = data->nr, count;
2589 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2590 const char *reset, *add_c, *del_c;
2591 int extra_shown = 0;
2592 const char *line_prefix = diff_line_prefix(options);
2593 struct strbuf out = STRBUF_INIT;
2594
2595 if (data->nr == 0)
2596 return;
2597
2598 count = options->stat_count ? options->stat_count : data->nr;
2599
2600 reset = diff_get_color_opt(options, DIFF_RESET);
2601 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2602 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2603
2604 /*
2605 * Find the longest filename and max number of changes
2606 */
2607 for (i = 0; (i < count) && (i < data->nr); i++) {
2608 struct diffstat_file *file = data->files[i];
2609 uintmax_t change = file->added + file->deleted;
2610
2611 if (!file->is_interesting && (change == 0)) {
2612 count++; /* not shown == room for one more */
2613 continue;
2614 }
2615 fill_print_name(file);
2616 len = strlen(file->print_name);
2617 if (max_len < len)
2618 max_len = len;
2619
2620 if (file->is_unmerged) {
2621 /* "Unmerged" is 8 characters */
2622 bin_width = bin_width < 8 ? 8 : bin_width;
2623 continue;
2624 }
2625 if (file->is_binary) {
2626 /* "Bin XXX -> YYY bytes" */
2627 int w = 14 + decimal_width(file->added)
2628 + decimal_width(file->deleted);
2629 bin_width = bin_width < w ? w : bin_width;
2630 /* Display change counts aligned with "Bin" */
2631 number_width = 3;
2632 continue;
2633 }
2634
2635 if (max_change < change)
2636 max_change = change;
2637 }
2638 count = i; /* where we can stop scanning in data->files[] */
2639
2640 /*
2641 * We have width = stat_width or term_columns() columns total.
2642 * We want a maximum of min(max_len, stat_name_width) for the name part.
2643 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2644 * We also need 1 for " " and 4 + decimal_width(max_change)
2645 * for " | NNNN " and one the empty column at the end, altogether
2646 * 6 + decimal_width(max_change).
2647 *
2648 * If there's not enough space, we will use the smaller of
2649 * stat_name_width (if set) and 5/8*width for the filename,
2650 * and the rest for constant elements + graph part, but no more
2651 * than stat_graph_width for the graph part.
2652 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2653 * for the standard terminal size).
2654 *
2655 * In other words: stat_width limits the maximum width, and
2656 * stat_name_width fixes the maximum width of the filename,
2657 * and is also used to divide available columns if there
2658 * aren't enough.
2659 *
2660 * Binary files are displayed with "Bin XXX -> YYY bytes"
2661 * instead of the change count and graph. This part is treated
2662 * similarly to the graph part, except that it is not
2663 * "scaled". If total width is too small to accommodate the
2664 * guaranteed minimum width of the filename part and the
2665 * separators and this message, this message will "overflow"
2666 * making the line longer than the maximum width.
2667 */
2668
2669 if (options->stat_width == -1)
2670 width = term_columns() - strlen(line_prefix);
2671 else
2672 width = options->stat_width ? options->stat_width : 80;
2673 number_width = decimal_width(max_change) > number_width ?
2674 decimal_width(max_change) : number_width;
2675
2676 if (options->stat_graph_width == -1)
2677 options->stat_graph_width = diff_stat_graph_width;
2678
2679 /*
2680 * Guarantee 3/8*16==6 for the graph part
2681 * and 5/8*16==10 for the filename part
2682 */
2683 if (width < 16 + 6 + number_width)
2684 width = 16 + 6 + number_width;
2685
2686 /*
2687 * First assign sizes that are wanted, ignoring available width.
2688 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2689 * starting from "XXX" should fit in graph_width.
2690 */
2691 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2692 if (options->stat_graph_width &&
2693 options->stat_graph_width < graph_width)
2694 graph_width = options->stat_graph_width;
2695
2696 name_width = (options->stat_name_width > 0 &&
2697 options->stat_name_width < max_len) ?
2698 options->stat_name_width : max_len;
2699
2700 /*
2701 * Adjust adjustable widths not to exceed maximum width
2702 */
2703 if (name_width + number_width + 6 + graph_width > width) {
2704 if (graph_width > width * 3/8 - number_width - 6) {
2705 graph_width = width * 3/8 - number_width - 6;
2706 if (graph_width < 6)
2707 graph_width = 6;
2708 }
2709
2710 if (options->stat_graph_width &&
2711 graph_width > options->stat_graph_width)
2712 graph_width = options->stat_graph_width;
2713 if (name_width > width - number_width - 6 - graph_width)
2714 name_width = width - number_width - 6 - graph_width;
2715 else
2716 graph_width = width - number_width - 6 - name_width;
2717 }
2718
2719 /*
2720 * From here name_width is the width of the name area,
2721 * and graph_width is the width of the graph area.
2722 * max_change is used to scale graph properly.
2723 */
2724 for (i = 0; i < count; i++) {
2725 const char *prefix = "";
2726 struct diffstat_file *file = data->files[i];
2727 char *name = file->print_name;
2728 uintmax_t added = file->added;
2729 uintmax_t deleted = file->deleted;
2730 int name_len;
2731
2732 if (!file->is_interesting && (added + deleted == 0))
2733 continue;
2734
2735 /*
2736 * "scale" the filename
2737 */
2738 len = name_width;
2739 name_len = strlen(name);
2740 if (name_width < name_len) {
2741 char *slash;
2742 prefix = "...";
2743 len -= 3;
2744 name += name_len - len;
2745 slash = strchr(name, '/');
2746 if (slash)
2747 name = slash;
2748 }
2749
2750 if (file->is_binary) {
2751 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2752 strbuf_addf(&out, " %*s", number_width, "Bin");
2753 if (!added && !deleted) {
2754 strbuf_addch(&out, '\n');
2755 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2756 out.buf, out.len, 0);
2757 strbuf_reset(&out);
2758 continue;
2759 }
2760 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2761 del_c, deleted, reset);
2762 strbuf_addstr(&out, " -> ");
2763 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2764 add_c, added, reset);
2765 strbuf_addstr(&out, " bytes\n");
2766 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2767 out.buf, out.len, 0);
2768 strbuf_reset(&out);
2769 continue;
2770 }
2771 else if (file->is_unmerged) {
2772 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2773 strbuf_addstr(&out, " Unmerged\n");
2774 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2775 out.buf, out.len, 0);
2776 strbuf_reset(&out);
2777 continue;
2778 }
2779
2780 /*
2781 * scale the add/delete
2782 */
2783 add = added;
2784 del = deleted;
2785
2786 if (graph_width <= max_change) {
2787 int total = scale_linear(add + del, graph_width, max_change);
2788 if (total < 2 && add && del)
2789 /* width >= 2 due to the sanity check */
2790 total = 2;
2791 if (add < del) {
2792 add = scale_linear(add, graph_width, max_change);
2793 del = total - add;
2794 } else {
2795 del = scale_linear(del, graph_width, max_change);
2796 add = total - del;
2797 }
2798 }
2799 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2800 strbuf_addf(&out, " %*"PRIuMAX"%s",
2801 number_width, added + deleted,
2802 added + deleted ? " " : "");
2803 show_graph(&out, '+', add, add_c, reset);
2804 show_graph(&out, '-', del, del_c, reset);
2805 strbuf_addch(&out, '\n');
2806 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2807 out.buf, out.len, 0);
2808 strbuf_reset(&out);
2809 }
2810
2811 for (i = 0; i < data->nr; i++) {
2812 struct diffstat_file *file = data->files[i];
2813 uintmax_t added = file->added;
2814 uintmax_t deleted = file->deleted;
2815
2816 if (file->is_unmerged ||
2817 (!file->is_interesting && (added + deleted == 0))) {
2818 total_files--;
2819 continue;
2820 }
2821
2822 if (!file->is_binary) {
2823 adds += added;
2824 dels += deleted;
2825 }
2826 if (i < count)
2827 continue;
2828 if (!extra_shown)
2829 emit_diff_symbol(options,
2830 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2831 NULL, 0, 0);
2832 extra_shown = 1;
2833 }
2834
2835 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2836 strbuf_release(&out);
2837 }
2838
2839 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2840 {
2841 int i, adds = 0, dels = 0, total_files = data->nr;
2842
2843 if (data->nr == 0)
2844 return;
2845
2846 for (i = 0; i < data->nr; i++) {
2847 int added = data->files[i]->added;
2848 int deleted = data->files[i]->deleted;
2849
2850 if (data->files[i]->is_unmerged ||
2851 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2852 total_files--;
2853 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2854 adds += added;
2855 dels += deleted;
2856 }
2857 }
2858 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2859 }
2860
2861 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2862 {
2863 int i;
2864
2865 if (data->nr == 0)
2866 return;
2867
2868 for (i = 0; i < data->nr; i++) {
2869 struct diffstat_file *file = data->files[i];
2870
2871 fprintf(options->file, "%s", diff_line_prefix(options));
2872
2873 if (file->is_binary)
2874 fprintf(options->file, "-\t-\t");
2875 else
2876 fprintf(options->file,
2877 "%"PRIuMAX"\t%"PRIuMAX"\t",
2878 file->added, file->deleted);
2879 if (options->line_termination) {
2880 fill_print_name(file);
2881 if (!file->is_renamed)
2882 write_name_quoted(file->name, options->file,
2883 options->line_termination);
2884 else {
2885 fputs(file->print_name, options->file);
2886 putc(options->line_termination, options->file);
2887 }
2888 } else {
2889 if (file->is_renamed) {
2890 putc('\0', options->file);
2891 write_name_quoted(file->from_name, options->file, '\0');
2892 }
2893 write_name_quoted(file->name, options->file, '\0');
2894 }
2895 }
2896 }
2897
2898 struct dirstat_file {
2899 const char *name;
2900 unsigned long changed;
2901 };
2902
2903 struct dirstat_dir {
2904 struct dirstat_file *files;
2905 int alloc, nr, permille, cumulative;
2906 };
2907
2908 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2909 unsigned long changed, const char *base, int baselen)
2910 {
2911 unsigned long sum_changes = 0;
2912 unsigned int sources = 0;
2913 const char *line_prefix = diff_line_prefix(opt);
2914
2915 while (dir->nr) {
2916 struct dirstat_file *f = dir->files;
2917 int namelen = strlen(f->name);
2918 unsigned long changes;
2919 char *slash;
2920
2921 if (namelen < baselen)
2922 break;
2923 if (memcmp(f->name, base, baselen))
2924 break;
2925 slash = strchr(f->name + baselen, '/');
2926 if (slash) {
2927 int newbaselen = slash + 1 - f->name;
2928 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2929 sources++;
2930 } else {
2931 changes = f->changed;
2932 dir->files++;
2933 dir->nr--;
2934 sources += 2;
2935 }
2936 sum_changes += changes;
2937 }
2938
2939 /*
2940 * We don't report dirstat's for
2941 * - the top level
2942 * - or cases where everything came from a single directory
2943 * under this directory (sources == 1).
2944 */
2945 if (baselen && sources != 1) {
2946 if (sum_changes) {
2947 int permille = sum_changes * 1000 / changed;
2948 if (permille >= dir->permille) {
2949 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2950 permille / 10, permille % 10, baselen, base);
2951 if (!dir->cumulative)
2952 return 0;
2953 }
2954 }
2955 }
2956 return sum_changes;
2957 }
2958
2959 static int dirstat_compare(const void *_a, const void *_b)
2960 {
2961 const struct dirstat_file *a = _a;
2962 const struct dirstat_file *b = _b;
2963 return strcmp(a->name, b->name);
2964 }
2965
2966 static void show_dirstat(struct diff_options *options)
2967 {
2968 int i;
2969 unsigned long changed;
2970 struct dirstat_dir dir;
2971 struct diff_queue_struct *q = &diff_queued_diff;
2972
2973 dir.files = NULL;
2974 dir.alloc = 0;
2975 dir.nr = 0;
2976 dir.permille = options->dirstat_permille;
2977 dir.cumulative = options->flags.dirstat_cumulative;
2978
2979 changed = 0;
2980 for (i = 0; i < q->nr; i++) {
2981 struct diff_filepair *p = q->queue[i];
2982 const char *name;
2983 unsigned long copied, added, damage;
2984 struct diff_populate_filespec_options dpf_options = {
2985 .check_size_only = 1,
2986 };
2987
2988 name = p->two->path ? p->two->path : p->one->path;
2989
2990 if (p->one->oid_valid && p->two->oid_valid &&
2991 oideq(&p->one->oid, &p->two->oid)) {
2992 /*
2993 * The SHA1 has not changed, so pre-/post-content is
2994 * identical. We can therefore skip looking at the
2995 * file contents altogether.
2996 */
2997 damage = 0;
2998 goto found_damage;
2999 }
3000
3001 if (options->flags.dirstat_by_file) {
3002 /*
3003 * In --dirstat-by-file mode, we don't really need to
3004 * look at the actual file contents at all.
3005 * The fact that the SHA1 changed is enough for us to
3006 * add this file to the list of results
3007 * (with each file contributing equal damage).
3008 */
3009 damage = 1;
3010 goto found_damage;
3011 }
3012
3013 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
3014 diff_populate_filespec(options->repo, p->one, NULL);
3015 diff_populate_filespec(options->repo, p->two, NULL);
3016 diffcore_count_changes(options->repo,
3017 p->one, p->two, NULL, NULL,
3018 &copied, &added);
3019 diff_free_filespec_data(p->one);
3020 diff_free_filespec_data(p->two);
3021 } else if (DIFF_FILE_VALID(p->one)) {
3022 diff_populate_filespec(options->repo, p->one, &dpf_options);
3023 copied = added = 0;
3024 diff_free_filespec_data(p->one);
3025 } else if (DIFF_FILE_VALID(p->two)) {
3026 diff_populate_filespec(options->repo, p->two, &dpf_options);
3027 copied = 0;
3028 added = p->two->size;
3029 diff_free_filespec_data(p->two);
3030 } else
3031 continue;
3032
3033 /*
3034 * Original minus copied is the removed material,
3035 * added is the new material. They are both damages
3036 * made to the preimage.
3037 * If the resulting damage is zero, we know that
3038 * diffcore_count_changes() considers the two entries to
3039 * be identical, but since the oid changed, we
3040 * know that there must have been _some_ kind of change,
3041 * so we force all entries to have damage > 0.
3042 */
3043 damage = (p->one->size - copied) + added;
3044 if (!damage)
3045 damage = 1;
3046
3047 found_damage:
3048 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3049 dir.files[dir.nr].name = name;
3050 dir.files[dir.nr].changed = damage;
3051 changed += damage;
3052 dir.nr++;
3053 }
3054
3055 /* This can happen even with many files, if everything was renames */
3056 if (!changed)
3057 return;
3058
3059 /* Show all directories with more than x% of the changes */
3060 QSORT(dir.files, dir.nr, dirstat_compare);
3061 gather_dirstat(options, &dir, changed, "", 0);
3062 }
3063
3064 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3065 {
3066 int i;
3067 unsigned long changed;
3068 struct dirstat_dir dir;
3069
3070 if (data->nr == 0)
3071 return;
3072
3073 dir.files = NULL;
3074 dir.alloc = 0;
3075 dir.nr = 0;
3076 dir.permille = options->dirstat_permille;
3077 dir.cumulative = options->flags.dirstat_cumulative;
3078
3079 changed = 0;
3080 for (i = 0; i < data->nr; i++) {
3081 struct diffstat_file *file = data->files[i];
3082 unsigned long damage = file->added + file->deleted;
3083 if (file->is_binary)
3084 /*
3085 * binary files counts bytes, not lines. Must find some
3086 * way to normalize binary bytes vs. textual lines.
3087 * The following heuristic assumes that there are 64
3088 * bytes per "line".
3089 * This is stupid and ugly, but very cheap...
3090 */
3091 damage = DIV_ROUND_UP(damage, 64);
3092 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3093 dir.files[dir.nr].name = file->name;
3094 dir.files[dir.nr].changed = damage;
3095 changed += damage;
3096 dir.nr++;
3097 }
3098
3099 /* This can happen even with many files, if everything was renames */
3100 if (!changed)
3101 return;
3102
3103 /* Show all directories with more than x% of the changes */
3104 QSORT(dir.files, dir.nr, dirstat_compare);
3105 gather_dirstat(options, &dir, changed, "", 0);
3106 }
3107
3108 static void free_diffstat_file(struct diffstat_file *f)
3109 {
3110 free(f->print_name);
3111 free(f->name);
3112 free(f->from_name);
3113 free(f);
3114 }
3115
3116 void free_diffstat_info(struct diffstat_t *diffstat)
3117 {
3118 int i;
3119 for (i = 0; i < diffstat->nr; i++)
3120 free_diffstat_file(diffstat->files[i]);
3121 free(diffstat->files);
3122 }
3123
3124 struct checkdiff_t {
3125 const char *filename;
3126 int lineno;
3127 int conflict_marker_size;
3128 struct diff_options *o;
3129 unsigned ws_rule;
3130 unsigned status;
3131 };
3132
3133 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3134 {
3135 char firstchar;
3136 int cnt;
3137
3138 if (len < marker_size + 1)
3139 return 0;
3140 firstchar = line[0];
3141 switch (firstchar) {
3142 case '=': case '>': case '<': case '|':
3143 break;
3144 default:
3145 return 0;
3146 }
3147 for (cnt = 1; cnt < marker_size; cnt++)
3148 if (line[cnt] != firstchar)
3149 return 0;
3150 /* line[1] through line[marker_size-1] are same as firstchar */
3151 if (len < marker_size + 1 || !isspace(line[marker_size]))
3152 return 0;
3153 return 1;
3154 }
3155
3156 static void checkdiff_consume_hunk(void *priv,
3157 long ob, long on, long nb, long nn,
3158 const char *func, long funclen)
3159
3160 {
3161 struct checkdiff_t *data = priv;
3162 data->lineno = nb - 1;
3163 }
3164
3165 static int checkdiff_consume(void *priv, char *line, unsigned long len)
3166 {
3167 struct checkdiff_t *data = priv;
3168 int marker_size = data->conflict_marker_size;
3169 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3170 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3171 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3172 char *err;
3173 const char *line_prefix;
3174
3175 assert(data->o);
3176 line_prefix = diff_line_prefix(data->o);
3177
3178 if (line[0] == '+') {
3179 unsigned bad;
3180 data->lineno++;
3181 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3182 data->status |= 1;
3183 fprintf(data->o->file,
3184 "%s%s:%d: leftover conflict marker\n",
3185 line_prefix, data->filename, data->lineno);
3186 }
3187 bad = ws_check(line + 1, len - 1, data->ws_rule);
3188 if (!bad)
3189 return 0;
3190 data->status |= bad;
3191 err = whitespace_error_string(bad);
3192 fprintf(data->o->file, "%s%s:%d: %s.\n",
3193 line_prefix, data->filename, data->lineno, err);
3194 free(err);
3195 emit_line(data->o, set, reset, line, 1);
3196 ws_check_emit(line + 1, len - 1, data->ws_rule,
3197 data->o->file, set, reset, ws);
3198 } else if (line[0] == ' ') {
3199 data->lineno++;
3200 }
3201 return 0;
3202 }
3203
3204 static unsigned char *deflate_it(char *data,
3205 unsigned long size,
3206 unsigned long *result_size)
3207 {
3208 int bound;
3209 unsigned char *deflated;
3210 git_zstream stream;
3211
3212 git_deflate_init(&stream, zlib_compression_level);
3213 bound = git_deflate_bound(&stream, size);
3214 deflated = xmalloc(bound);
3215 stream.next_out = deflated;
3216 stream.avail_out = bound;
3217
3218 stream.next_in = (unsigned char *)data;
3219 stream.avail_in = size;
3220 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3221 ; /* nothing */
3222 git_deflate_end(&stream);
3223 *result_size = stream.total_out;
3224 return deflated;
3225 }
3226
3227 static void emit_binary_diff_body(struct diff_options *o,
3228 mmfile_t *one, mmfile_t *two)
3229 {
3230 void *cp;
3231 void *delta;
3232 void *deflated;
3233 void *data;
3234 unsigned long orig_size;
3235 unsigned long delta_size;
3236 unsigned long deflate_size;
3237 unsigned long data_size;
3238
3239 /* We could do deflated delta, or we could do just deflated two,
3240 * whichever is smaller.
3241 */
3242 delta = NULL;
3243 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3244 if (one->size && two->size) {
3245 delta = diff_delta(one->ptr, one->size,
3246 two->ptr, two->size,
3247 &delta_size, deflate_size);
3248 if (delta) {
3249 void *to_free = delta;
3250 orig_size = delta_size;
3251 delta = deflate_it(delta, delta_size, &delta_size);
3252 free(to_free);
3253 }
3254 }
3255
3256 if (delta && delta_size < deflate_size) {
3257 char *s = xstrfmt("%"PRIuMAX , (uintmax_t)orig_size);
3258 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3259 s, strlen(s), 0);
3260 free(s);
3261 free(deflated);
3262 data = delta;
3263 data_size = delta_size;
3264 } else {
3265 char *s = xstrfmt("%lu", two->size);
3266 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3267 s, strlen(s), 0);
3268 free(s);
3269 free(delta);
3270 data = deflated;
3271 data_size = deflate_size;
3272 }
3273
3274 /* emit data encoded in base85 */
3275 cp = data;
3276 while (data_size) {
3277 int len;
3278 int bytes = (52 < data_size) ? 52 : data_size;
3279 char line[71];
3280 data_size -= bytes;
3281 if (bytes <= 26)
3282 line[0] = bytes + 'A' - 1;
3283 else
3284 line[0] = bytes - 26 + 'a' - 1;
3285 encode_85(line + 1, cp, bytes);
3286 cp = (char *) cp + bytes;
3287
3288 len = strlen(line);
3289 line[len++] = '\n';
3290 line[len] = '\0';
3291
3292 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3293 line, len, 0);
3294 }
3295 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3296 free(data);
3297 }
3298
3299 static void emit_binary_diff(struct diff_options *o,
3300 mmfile_t *one, mmfile_t *two)
3301 {
3302 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3303 emit_binary_diff_body(o, one, two);
3304 emit_binary_diff_body(o, two, one);
3305 }
3306
3307 int diff_filespec_is_binary(struct repository *r,
3308 struct diff_filespec *one)
3309 {
3310 struct diff_populate_filespec_options dpf_options = {
3311 .check_binary = 1,
3312 };
3313
3314 if (one->is_binary == -1) {
3315 diff_filespec_load_driver(one, r->index);
3316 if (one->driver->binary != -1)
3317 one->is_binary = one->driver->binary;
3318 else {
3319 if (!one->data && DIFF_FILE_VALID(one))
3320 diff_populate_filespec(r, one, &dpf_options);
3321 if (one->is_binary == -1 && one->data)
3322 one->is_binary = buffer_is_binary(one->data,
3323 one->size);
3324 if (one->is_binary == -1)
3325 one->is_binary = 0;
3326 }
3327 }
3328 return one->is_binary;
3329 }
3330
3331 static const struct userdiff_funcname *
3332 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3333 {
3334 diff_filespec_load_driver(one, o->repo->index);
3335 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3336 }
3337
3338 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3339 {
3340 if (!options->a_prefix)
3341 options->a_prefix = a;
3342 if (!options->b_prefix)
3343 options->b_prefix = b;
3344 }
3345
3346 struct userdiff_driver *get_textconv(struct repository *r,
3347 struct diff_filespec *one)
3348 {
3349 if (!DIFF_FILE_VALID(one))
3350 return NULL;
3351
3352 diff_filespec_load_driver(one, r->index);
3353 return userdiff_get_textconv(r, one->driver);
3354 }
3355
3356 static void builtin_diff(const char *name_a,
3357 const char *name_b,
3358 struct diff_filespec *one,
3359 struct diff_filespec *two,
3360 const char *xfrm_msg,
3361 int must_show_header,
3362 struct diff_options *o,
3363 int complete_rewrite)
3364 {
3365 mmfile_t mf1, mf2;
3366 const char *lbl[2];
3367 char *a_one, *b_two;
3368 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3369 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3370 const char *a_prefix, *b_prefix;
3371 struct userdiff_driver *textconv_one = NULL;
3372 struct userdiff_driver *textconv_two = NULL;
3373 struct strbuf header = STRBUF_INIT;
3374 const char *line_prefix = diff_line_prefix(o);
3375
3376 diff_set_mnemonic_prefix(o, "a/", "b/");
3377 if (o->flags.reverse_diff) {
3378 a_prefix = o->b_prefix;
3379 b_prefix = o->a_prefix;
3380 } else {
3381 a_prefix = o->a_prefix;
3382 b_prefix = o->b_prefix;
3383 }
3384
3385 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3386 (!one->mode || S_ISGITLINK(one->mode)) &&
3387 (!two->mode || S_ISGITLINK(two->mode))) {
3388 show_submodule_diff_summary(o, one->path ? one->path : two->path,
3389 &one->oid, &two->oid,
3390 two->dirty_submodule);
3391 return;
3392 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3393 (!one->mode || S_ISGITLINK(one->mode)) &&
3394 (!two->mode || S_ISGITLINK(two->mode))) {
3395 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3396 &one->oid, &two->oid,
3397 two->dirty_submodule);
3398 return;
3399 }
3400
3401 if (o->flags.allow_textconv) {
3402 textconv_one = get_textconv(o->repo, one);
3403 textconv_two = get_textconv(o->repo, two);
3404 }
3405
3406 /* Never use a non-valid filename anywhere if at all possible */
3407 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3408 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3409
3410 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3411 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3412 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3413 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3414 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3415 if (lbl[0][0] == '/') {
3416 /* /dev/null */
3417 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3418 if (xfrm_msg)
3419 strbuf_addstr(&header, xfrm_msg);
3420 must_show_header = 1;
3421 }
3422 else if (lbl[1][0] == '/') {
3423 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3424 if (xfrm_msg)
3425 strbuf_addstr(&header, xfrm_msg);
3426 must_show_header = 1;
3427 }
3428 else {
3429 if (one->mode != two->mode) {
3430 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3431 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3432 must_show_header = 1;
3433 }
3434 if (xfrm_msg)
3435 strbuf_addstr(&header, xfrm_msg);
3436
3437 /*
3438 * we do not run diff between different kind
3439 * of objects.
3440 */
3441 if ((one->mode ^ two->mode) & S_IFMT)
3442 goto free_ab_and_return;
3443 if (complete_rewrite &&
3444 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3445 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3446 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3447 header.buf, header.len, 0);
3448 strbuf_reset(&header);
3449 emit_rewrite_diff(name_a, name_b, one, two,
3450 textconv_one, textconv_two, o);
3451 o->found_changes = 1;
3452 goto free_ab_and_return;
3453 }
3454 }
3455
3456 if (o->irreversible_delete && lbl[1][0] == '/') {
3457 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3458 header.len, 0);
3459 strbuf_reset(&header);
3460 goto free_ab_and_return;
3461 } else if (!o->flags.text &&
3462 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3463 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3464 struct strbuf sb = STRBUF_INIT;
3465 if (!one->data && !two->data &&
3466 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3467 !o->flags.binary) {
3468 if (oideq(&one->oid, &two->oid)) {
3469 if (must_show_header)
3470 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3471 header.buf, header.len,
3472 0);
3473 goto free_ab_and_return;
3474 }
3475 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3476 header.buf, header.len, 0);
3477 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3478 diff_line_prefix(o), lbl[0], lbl[1]);
3479 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3480 sb.buf, sb.len, 0);
3481 strbuf_release(&sb);
3482 goto free_ab_and_return;
3483 }
3484 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3485 fill_mmfile(o->repo, &mf2, two) < 0)
3486 die("unable to read files to diff");
3487 /* Quite common confusing case */
3488 if (mf1.size == mf2.size &&
3489 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3490 if (must_show_header)
3491 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3492 header.buf, header.len, 0);
3493 goto free_ab_and_return;
3494 }
3495 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3496 strbuf_reset(&header);
3497 if (o->flags.binary)
3498 emit_binary_diff(o, &mf1, &mf2);
3499 else {
3500 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3501 diff_line_prefix(o), lbl[0], lbl[1]);
3502 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3503 sb.buf, sb.len, 0);
3504 strbuf_release(&sb);
3505 }
3506 o->found_changes = 1;
3507 } else {
3508 /* Crazy xdl interfaces.. */
3509 const char *diffopts;
3510 const char *v;
3511 xpparam_t xpp;
3512 xdemitconf_t xecfg;
3513 struct emit_callback ecbdata;
3514 const struct userdiff_funcname *pe;
3515
3516 if (must_show_header) {
3517 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3518 header.buf, header.len, 0);
3519 strbuf_reset(&header);
3520 }
3521
3522 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3523 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3524
3525 pe = diff_funcname_pattern(o, one);
3526 if (!pe)
3527 pe = diff_funcname_pattern(o, two);
3528
3529 memset(&xpp, 0, sizeof(xpp));
3530 memset(&xecfg, 0, sizeof(xecfg));
3531 memset(&ecbdata, 0, sizeof(ecbdata));
3532 if (o->flags.suppress_diff_headers)
3533 lbl[0] = NULL;
3534 ecbdata.label_path = lbl;
3535 ecbdata.color_diff = want_color(o->use_color);
3536 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3537 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3538 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3539 ecbdata.opt = o;
3540 if (header.len && !o->flags.suppress_diff_headers)
3541 ecbdata.header = &header;
3542 xpp.flags = o->xdl_opts;
3543 xpp.ignore_regex = o->ignore_regex;
3544 xpp.ignore_regex_nr = o->ignore_regex_nr;
3545 xpp.anchors = o->anchors;
3546 xpp.anchors_nr = o->anchors_nr;
3547 xecfg.ctxlen = o->context;
3548 xecfg.interhunkctxlen = o->interhunkcontext;
3549 xecfg.flags = XDL_EMIT_FUNCNAMES;
3550 if (o->flags.funccontext)
3551 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3552 if (pe)
3553 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3554
3555 diffopts = getenv("GIT_DIFF_OPTS");
3556 if (!diffopts)
3557 ;
3558 else if (skip_prefix(diffopts, "--unified=", &v))
3559 xecfg.ctxlen = strtoul(v, NULL, 10);
3560 else if (skip_prefix(diffopts, "-u", &v))
3561 xecfg.ctxlen = strtoul(v, NULL, 10);
3562
3563 if (o->word_diff)
3564 init_diff_words_data(&ecbdata, o, one, two);
3565 if (xdi_diff_outf(&mf1, &mf2, NULL, fn_out_consume,
3566 &ecbdata, &xpp, &xecfg))
3567 die("unable to generate diff for %s", one->path);
3568 if (o->word_diff)
3569 free_diff_words_data(&ecbdata);
3570 if (textconv_one)
3571 free(mf1.ptr);
3572 if (textconv_two)
3573 free(mf2.ptr);
3574 xdiff_clear_find_func(&xecfg);
3575 }
3576
3577 free_ab_and_return:
3578 strbuf_release(&header);
3579 diff_free_filespec_data(one);
3580 diff_free_filespec_data(two);
3581 free(a_one);
3582 free(b_two);
3583 return;
3584 }
3585
3586 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3587 {
3588 if (!is_renamed) {
3589 if (p->status == DIFF_STATUS_ADDED) {
3590 if (S_ISLNK(p->two->mode))
3591 return "new +l";
3592 else if ((p->two->mode & 0777) == 0755)
3593 return "new +x";
3594 else
3595 return "new";
3596 } else if (p->status == DIFF_STATUS_DELETED)
3597 return "gone";
3598 }
3599 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3600 return "mode -l";
3601 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3602 return "mode +l";
3603 else if ((p->one->mode & 0777) == 0644 &&
3604 (p->two->mode & 0777) == 0755)
3605 return "mode +x";
3606 else if ((p->one->mode & 0777) == 0755 &&
3607 (p->two->mode & 0777) == 0644)
3608 return "mode -x";
3609 return NULL;
3610 }
3611
3612 static void builtin_diffstat(const char *name_a, const char *name_b,
3613 struct diff_filespec *one,
3614 struct diff_filespec *two,
3615 struct diffstat_t *diffstat,
3616 struct diff_options *o,
3617 struct diff_filepair *p)
3618 {
3619 mmfile_t mf1, mf2;
3620 struct diffstat_file *data;
3621 int may_differ;
3622 int complete_rewrite = 0;
3623
3624 if (!DIFF_PAIR_UNMERGED(p)) {
3625 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3626 complete_rewrite = 1;
3627 }
3628
3629 data = diffstat_add(diffstat, name_a, name_b);
3630 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3631 if (o->flags.stat_with_summary)
3632 data->comments = get_compact_summary(p, data->is_renamed);
3633
3634 if (!one || !two) {
3635 data->is_unmerged = 1;
3636 return;
3637 }
3638
3639 /* saves some reads if true, not a guarantee of diff outcome */
3640 may_differ = !(one->oid_valid && two->oid_valid &&
3641 oideq(&one->oid, &two->oid));
3642
3643 if (diff_filespec_is_binary(o->repo, one) ||
3644 diff_filespec_is_binary(o->repo, two)) {
3645 data->is_binary = 1;
3646 if (!may_differ) {
3647 data->added = 0;
3648 data->deleted = 0;
3649 } else {
3650 data->added = diff_filespec_size(o->repo, two);
3651 data->deleted = diff_filespec_size(o->repo, one);
3652 }
3653 }
3654
3655 else if (complete_rewrite) {
3656 diff_populate_filespec(o->repo, one, NULL);
3657 diff_populate_filespec(o->repo, two, NULL);
3658 data->deleted = count_lines(one->data, one->size);
3659 data->added = count_lines(two->data, two->size);
3660 }
3661
3662 else if (may_differ) {
3663 /* Crazy xdl interfaces.. */
3664 xpparam_t xpp;
3665 xdemitconf_t xecfg;
3666
3667 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3668 fill_mmfile(o->repo, &mf2, two) < 0)
3669 die("unable to read files to diff");
3670
3671 memset(&xpp, 0, sizeof(xpp));
3672 memset(&xecfg, 0, sizeof(xecfg));
3673 xpp.flags = o->xdl_opts;
3674 xpp.ignore_regex = o->ignore_regex;
3675 xpp.ignore_regex_nr = o->ignore_regex_nr;
3676 xpp.anchors = o->anchors;
3677 xpp.anchors_nr = o->anchors_nr;
3678 xecfg.ctxlen = o->context;
3679 xecfg.interhunkctxlen = o->interhunkcontext;
3680 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
3681 if (xdi_diff_outf(&mf1, &mf2, NULL,
3682 diffstat_consume, diffstat, &xpp, &xecfg))
3683 die("unable to generate diffstat for %s", one->path);
3684
3685 if (DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two)) {
3686 struct diffstat_file *file =
3687 diffstat->files[diffstat->nr - 1];
3688 /*
3689 * Omit diffstats of modified files where nothing changed.
3690 * Even if may_differ, this might be the case due to
3691 * ignoring whitespace changes, etc.
3692 *
3693 * But note that we special-case additions, deletions,
3694 * renames, and mode changes as adding an empty file,
3695 * for example is still of interest.
3696 */
3697 if ((p->status == DIFF_STATUS_MODIFIED)
3698 && !file->added
3699 && !file->deleted
3700 && one->mode == two->mode) {
3701 free_diffstat_file(file);
3702 diffstat->nr--;
3703 }
3704 }
3705 }
3706
3707 diff_free_filespec_data(one);
3708 diff_free_filespec_data(two);
3709 }
3710
3711 static void builtin_checkdiff(const char *name_a, const char *name_b,
3712 const char *attr_path,
3713 struct diff_filespec *one,
3714 struct diff_filespec *two,
3715 struct diff_options *o)
3716 {
3717 mmfile_t mf1, mf2;
3718 struct checkdiff_t data;
3719
3720 if (!two)
3721 return;
3722
3723 memset(&data, 0, sizeof(data));
3724 data.filename = name_b ? name_b : name_a;
3725 data.lineno = 0;
3726 data.o = o;
3727 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3728 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3729
3730 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3731 fill_mmfile(o->repo, &mf2, two) < 0)
3732 die("unable to read files to diff");
3733
3734 /*
3735 * All the other codepaths check both sides, but not checking
3736 * the "old" side here is deliberate. We are checking the newly
3737 * introduced changes, and as long as the "new" side is text, we
3738 * can and should check what it introduces.
3739 */
3740 if (diff_filespec_is_binary(o->repo, two))
3741 goto free_and_return;
3742 else {
3743 /* Crazy xdl interfaces.. */
3744 xpparam_t xpp;
3745 xdemitconf_t xecfg;
3746
3747 memset(&xpp, 0, sizeof(xpp));
3748 memset(&xecfg, 0, sizeof(xecfg));
3749 xecfg.ctxlen = 1; /* at least one context line */
3750 xpp.flags = 0;
3751 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume_hunk,
3752 checkdiff_consume, &data,
3753 &xpp, &xecfg))
3754 die("unable to generate checkdiff for %s", one->path);
3755
3756 if (data.ws_rule & WS_BLANK_AT_EOF) {
3757 struct emit_callback ecbdata;
3758 int blank_at_eof;
3759
3760 ecbdata.ws_rule = data.ws_rule;
3761 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3762 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3763
3764 if (blank_at_eof) {
3765 static char *err;
3766 if (!err)
3767 err = whitespace_error_string(WS_BLANK_AT_EOF);
3768 fprintf(o->file, "%s:%d: %s.\n",
3769 data.filename, blank_at_eof, err);
3770 data.status = 1; /* report errors */
3771 }
3772 }
3773 }
3774 free_and_return:
3775 diff_free_filespec_data(one);
3776 diff_free_filespec_data(two);
3777 if (data.status)
3778 o->flags.check_failed = 1;
3779 }
3780
3781 struct diff_filespec *alloc_filespec(const char *path)
3782 {
3783 struct diff_filespec *spec;
3784
3785 FLEXPTR_ALLOC_STR(spec, path, path);
3786 spec->count = 1;
3787 spec->is_binary = -1;
3788 return spec;
3789 }
3790
3791 void free_filespec(struct diff_filespec *spec)
3792 {
3793 if (!--spec->count) {
3794 diff_free_filespec_data(spec);
3795 free(spec);
3796 }
3797 }
3798
3799 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3800 int oid_valid, unsigned short mode)
3801 {
3802 if (mode) {
3803 spec->mode = canon_mode(mode);
3804 oidcpy(&spec->oid, oid);
3805 spec->oid_valid = oid_valid;
3806 }
3807 }
3808
3809 /*
3810 * Given a name and sha1 pair, if the index tells us the file in
3811 * the work tree has that object contents, return true, so that
3812 * prepare_temp_file() does not have to inflate and extract.
3813 */
3814 static int reuse_worktree_file(struct index_state *istate,
3815 const char *name,
3816 const struct object_id *oid,
3817 int want_file)
3818 {
3819 const struct cache_entry *ce;
3820 struct stat st;
3821 int pos, len;
3822
3823 /*
3824 * We do not read the cache ourselves here, because the
3825 * benchmark with my previous version that always reads cache
3826 * shows that it makes things worse for diff-tree comparing
3827 * two linux-2.6 kernel trees in an already checked out work
3828 * tree. This is because most diff-tree comparisons deal with
3829 * only a small number of files, while reading the cache is
3830 * expensive for a large project, and its cost outweighs the
3831 * savings we get by not inflating the object to a temporary
3832 * file. Practically, this code only helps when we are used
3833 * by diff-cache --cached, which does read the cache before
3834 * calling us.
3835 */
3836 if (!istate->cache)
3837 return 0;
3838
3839 /* We want to avoid the working directory if our caller
3840 * doesn't need the data in a normal file, this system
3841 * is rather slow with its stat/open/mmap/close syscalls,
3842 * and the object is contained in a pack file. The pack
3843 * is probably already open and will be faster to obtain
3844 * the data through than the working directory. Loose
3845 * objects however would tend to be slower as they need
3846 * to be individually opened and inflated.
3847 */
3848 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3849 return 0;
3850
3851 /*
3852 * Similarly, if we'd have to convert the file contents anyway, that
3853 * makes the optimization not worthwhile.
3854 */
3855 if (!want_file && would_convert_to_git(istate, name))
3856 return 0;
3857
3858 /*
3859 * If this path does not match our sparse-checkout definition,
3860 * then the file will not be in the working directory.
3861 */
3862 if (!path_in_sparse_checkout(name, istate))
3863 return 0;
3864
3865 len = strlen(name);
3866 pos = index_name_pos(istate, name, len);
3867 if (pos < 0)
3868 return 0;
3869 ce = istate->cache[pos];
3870
3871 /*
3872 * This is not the sha1 we are looking for, or
3873 * unreusable because it is not a regular file.
3874 */
3875 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3876 return 0;
3877
3878 /*
3879 * If ce is marked as "assume unchanged", there is no
3880 * guarantee that work tree matches what we are looking for.
3881 */
3882 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3883 return 0;
3884
3885 /*
3886 * If ce matches the file in the work tree, we can reuse it.
3887 */
3888 if (ce_uptodate(ce) ||
3889 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3890 return 1;
3891
3892 return 0;
3893 }
3894
3895 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3896 {
3897 struct strbuf buf = STRBUF_INIT;
3898 char *dirty = "";
3899
3900 /* Are we looking at the work tree? */
3901 if (s->dirty_submodule)
3902 dirty = "-dirty";
3903
3904 strbuf_addf(&buf, "Subproject commit %s%s\n",
3905 oid_to_hex(&s->oid), dirty);
3906 s->size = buf.len;
3907 if (size_only) {
3908 s->data = NULL;
3909 strbuf_release(&buf);
3910 } else {
3911 s->data = strbuf_detach(&buf, NULL);
3912 s->should_free = 1;
3913 }
3914 return 0;
3915 }
3916
3917 /*
3918 * While doing rename detection and pickaxe operation, we may need to
3919 * grab the data for the blob (or file) for our own in-core comparison.
3920 * diff_filespec has data and size fields for this purpose.
3921 */
3922 int diff_populate_filespec(struct repository *r,
3923 struct diff_filespec *s,
3924 const struct diff_populate_filespec_options *options)
3925 {
3926 int size_only = options ? options->check_size_only : 0;
3927 int check_binary = options ? options->check_binary : 0;
3928 int err = 0;
3929 int conv_flags = global_conv_flags_eol;
3930 /*
3931 * demote FAIL to WARN to allow inspecting the situation
3932 * instead of refusing.
3933 */
3934 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3935 conv_flags = CONV_EOL_RNDTRP_WARN;
3936
3937 if (!DIFF_FILE_VALID(s))
3938 die("internal error: asking to populate invalid file.");
3939 if (S_ISDIR(s->mode))
3940 return -1;
3941
3942 if (s->data)
3943 return 0;
3944
3945 if (size_only && 0 < s->size)
3946 return 0;
3947
3948 if (S_ISGITLINK(s->mode))
3949 return diff_populate_gitlink(s, size_only);
3950
3951 if (!s->oid_valid ||
3952 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3953 struct strbuf buf = STRBUF_INIT;
3954 struct stat st;
3955 int fd;
3956
3957 if (lstat(s->path, &st) < 0) {
3958 err_empty:
3959 err = -1;
3960 empty:
3961 s->data = (char *)"";
3962 s->size = 0;
3963 return err;
3964 }
3965 s->size = xsize_t(st.st_size);
3966 if (!s->size)
3967 goto empty;
3968 if (S_ISLNK(st.st_mode)) {
3969 struct strbuf sb = STRBUF_INIT;
3970
3971 if (strbuf_readlink(&sb, s->path, s->size))
3972 goto err_empty;
3973 s->size = sb.len;
3974 s->data = strbuf_detach(&sb, NULL);
3975 s->should_free = 1;
3976 return 0;
3977 }
3978
3979 /*
3980 * Even if the caller would be happy with getting
3981 * only the size, we cannot return early at this
3982 * point if the path requires us to run the content
3983 * conversion.
3984 */
3985 if (size_only && !would_convert_to_git(r->index, s->path))
3986 return 0;
3987
3988 /*
3989 * Note: this check uses xsize_t(st.st_size) that may
3990 * not be the true size of the blob after it goes
3991 * through convert_to_git(). This may not strictly be
3992 * correct, but the whole point of big_file_threshold
3993 * and is_binary check being that we want to avoid
3994 * opening the file and inspecting the contents, this
3995 * is probably fine.
3996 */
3997 if (check_binary &&
3998 s->size > big_file_threshold && s->is_binary == -1) {
3999 s->is_binary = 1;
4000 return 0;
4001 }
4002 fd = open(s->path, O_RDONLY);
4003 if (fd < 0)
4004 goto err_empty;
4005 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
4006 close(fd);
4007 s->should_munmap = 1;
4008
4009 /*
4010 * Convert from working tree format to canonical git format
4011 */
4012 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
4013 size_t size = 0;
4014 munmap(s->data, s->size);
4015 s->should_munmap = 0;
4016 s->data = strbuf_detach(&buf, &size);
4017 s->size = size;
4018 s->should_free = 1;
4019 }
4020 }
4021 else {
4022 struct object_info info = {
4023 .sizep = &s->size
4024 };
4025
4026 if (!(size_only || check_binary))
4027 /*
4028 * Set contentp, since there is no chance that merely
4029 * the size is sufficient.
4030 */
4031 info.contentp = &s->data;
4032
4033 if (options && options->missing_object_cb) {
4034 if (!oid_object_info_extended(r, &s->oid, &info,
4035 OBJECT_INFO_LOOKUP_REPLACE |
4036 OBJECT_INFO_SKIP_FETCH_OBJECT))
4037 goto object_read;
4038 options->missing_object_cb(options->missing_object_data);
4039 }
4040 if (oid_object_info_extended(r, &s->oid, &info,
4041 OBJECT_INFO_LOOKUP_REPLACE))
4042 die("unable to read %s", oid_to_hex(&s->oid));
4043
4044 object_read:
4045 if (size_only || check_binary) {
4046 if (size_only)
4047 return 0;
4048 if (s->size > big_file_threshold && s->is_binary == -1) {
4049 s->is_binary = 1;
4050 return 0;
4051 }
4052 }
4053 if (!info.contentp) {
4054 info.contentp = &s->data;
4055 if (oid_object_info_extended(r, &s->oid, &info,
4056 OBJECT_INFO_LOOKUP_REPLACE))
4057 die("unable to read %s", oid_to_hex(&s->oid));
4058 }
4059 s->should_free = 1;
4060 }
4061 return 0;
4062 }
4063
4064 void diff_free_filespec_blob(struct diff_filespec *s)
4065 {
4066 if (s->should_free)
4067 free(s->data);
4068 else if (s->should_munmap)
4069 munmap(s->data, s->size);
4070
4071 if (s->should_free || s->should_munmap) {
4072 s->should_free = s->should_munmap = 0;
4073 s->data = NULL;
4074 }
4075 }
4076
4077 void diff_free_filespec_data(struct diff_filespec *s)
4078 {
4079 if (!s)
4080 return;
4081
4082 diff_free_filespec_blob(s);
4083 FREE_AND_NULL(s->cnt_data);
4084 }
4085
4086 static void prep_temp_blob(struct index_state *istate,
4087 const char *path, struct diff_tempfile *temp,
4088 void *blob,
4089 unsigned long size,
4090 const struct object_id *oid,
4091 int mode)
4092 {
4093 struct strbuf buf = STRBUF_INIT;
4094 struct strbuf tempfile = STRBUF_INIT;
4095 char *path_dup = xstrdup(path);
4096 const char *base = basename(path_dup);
4097 struct checkout_metadata meta;
4098
4099 init_checkout_metadata(&meta, NULL, NULL, oid);
4100
4101 /* Generate "XXXXXX_basename.ext" */
4102 strbuf_addstr(&tempfile, "XXXXXX_");
4103 strbuf_addstr(&tempfile, base);
4104
4105 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4106 if (!temp->tempfile)
4107 die_errno("unable to create temp-file");
4108 if (convert_to_working_tree(istate, path,
4109 (const char *)blob, (size_t)size, &buf, &meta)) {
4110 blob = buf.buf;
4111 size = buf.len;
4112 }
4113 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4114 close_tempfile_gently(temp->tempfile))
4115 die_errno("unable to write temp-file");
4116 temp->name = get_tempfile_path(temp->tempfile);
4117 oid_to_hex_r(temp->hex, oid);
4118 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4119 strbuf_release(&buf);
4120 strbuf_release(&tempfile);
4121 free(path_dup);
4122 }
4123
4124 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4125 const char *name,
4126 struct diff_filespec *one)
4127 {
4128 struct diff_tempfile *temp = claim_diff_tempfile();
4129
4130 if (!DIFF_FILE_VALID(one)) {
4131 not_a_valid_file:
4132 /* A '-' entry produces this for file-2, and
4133 * a '+' entry produces this for file-1.
4134 */
4135 temp->name = "/dev/null";
4136 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4137 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4138 return temp;
4139 }
4140
4141 if (!S_ISGITLINK(one->mode) &&
4142 (!one->oid_valid ||
4143 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4144 struct stat st;
4145 if (lstat(name, &st) < 0) {
4146 if (errno == ENOENT)
4147 goto not_a_valid_file;
4148 die_errno("stat(%s)", name);
4149 }
4150 if (S_ISLNK(st.st_mode)) {
4151 struct strbuf sb = STRBUF_INIT;
4152 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4153 die_errno("readlink(%s)", name);
4154 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4155 (one->oid_valid ?
4156 &one->oid : null_oid()),
4157 (one->oid_valid ?
4158 one->mode : S_IFLNK));
4159 strbuf_release(&sb);
4160 }
4161 else {
4162 /* we can borrow from the file in the work tree */
4163 temp->name = name;
4164 if (!one->oid_valid)
4165 oid_to_hex_r(temp->hex, null_oid());
4166 else
4167 oid_to_hex_r(temp->hex, &one->oid);
4168 /* Even though we may sometimes borrow the
4169 * contents from the work tree, we always want
4170 * one->mode. mode is trustworthy even when
4171 * !(one->oid_valid), as long as
4172 * DIFF_FILE_VALID(one).
4173 */
4174 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4175 }
4176 return temp;
4177 }
4178 else {
4179 if (diff_populate_filespec(r, one, NULL))
4180 die("cannot read data blob for %s", one->path);
4181 prep_temp_blob(r->index, name, temp,
4182 one->data, one->size,
4183 &one->oid, one->mode);
4184 }
4185 return temp;
4186 }
4187
4188 static void add_external_diff_name(struct repository *r,
4189 struct strvec *argv,
4190 const char *name,
4191 struct diff_filespec *df)
4192 {
4193 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4194 strvec_push(argv, temp->name);
4195 strvec_push(argv, temp->hex);
4196 strvec_push(argv, temp->mode);
4197 }
4198
4199 /* An external diff command takes:
4200 *
4201 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4202 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4203 *
4204 */
4205 static void run_external_diff(const char *pgm,
4206 const char *name,
4207 const char *other,
4208 struct diff_filespec *one,
4209 struct diff_filespec *two,
4210 const char *xfrm_msg,
4211 struct diff_options *o)
4212 {
4213 struct strvec argv = STRVEC_INIT;
4214 struct strvec env = STRVEC_INIT;
4215 struct diff_queue_struct *q = &diff_queued_diff;
4216
4217 strvec_push(&argv, pgm);
4218 strvec_push(&argv, name);
4219
4220 if (one && two) {
4221 add_external_diff_name(o->repo, &argv, name, one);
4222 if (!other)
4223 add_external_diff_name(o->repo, &argv, name, two);
4224 else {
4225 add_external_diff_name(o->repo, &argv, other, two);
4226 strvec_push(&argv, other);
4227 strvec_push(&argv, xfrm_msg);
4228 }
4229 }
4230
4231 strvec_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4232 strvec_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4233
4234 diff_free_filespec_data(one);
4235 diff_free_filespec_data(two);
4236 if (run_command_v_opt_cd_env(argv.v, RUN_USING_SHELL, NULL, env.v))
4237 die(_("external diff died, stopping at %s"), name);
4238
4239 remove_tempfile();
4240 strvec_clear(&argv);
4241 strvec_clear(&env);
4242 }
4243
4244 static int similarity_index(struct diff_filepair *p)
4245 {
4246 return p->score * 100 / MAX_SCORE;
4247 }
4248
4249 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4250 {
4251 if (startup_info->have_repository)
4252 return find_unique_abbrev(oid, abbrev);
4253 else {
4254 char *hex = oid_to_hex(oid);
4255 if (abbrev < 0)
4256 abbrev = FALLBACK_DEFAULT_ABBREV;
4257 if (abbrev > the_hash_algo->hexsz)
4258 BUG("oid abbreviation out of range: %d", abbrev);
4259 if (abbrev)
4260 hex[abbrev] = '\0';
4261 return hex;
4262 }
4263 }
4264
4265 static void fill_metainfo(struct strbuf *msg,
4266 const char *name,
4267 const char *other,
4268 struct diff_filespec *one,
4269 struct diff_filespec *two,
4270 struct diff_options *o,
4271 struct diff_filepair *p,
4272 int *must_show_header,
4273 int use_color)
4274 {
4275 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4276 const char *reset = diff_get_color(use_color, DIFF_RESET);
4277 const char *line_prefix = diff_line_prefix(o);
4278
4279 *must_show_header = 1;
4280 strbuf_init(msg, PATH_MAX * 2 + 300);
4281 switch (p->status) {
4282 case DIFF_STATUS_COPIED:
4283 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4284 line_prefix, set, similarity_index(p));
4285 strbuf_addf(msg, "%s\n%s%scopy from ",
4286 reset, line_prefix, set);
4287 quote_c_style(name, msg, NULL, 0);
4288 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4289 quote_c_style(other, msg, NULL, 0);
4290 strbuf_addf(msg, "%s\n", reset);
4291 break;
4292 case DIFF_STATUS_RENAMED:
4293 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4294 line_prefix, set, similarity_index(p));
4295 strbuf_addf(msg, "%s\n%s%srename from ",
4296 reset, line_prefix, set);
4297 quote_c_style(name, msg, NULL, 0);
4298 strbuf_addf(msg, "%s\n%s%srename to ",
4299 reset, line_prefix, set);
4300 quote_c_style(other, msg, NULL, 0);
4301 strbuf_addf(msg, "%s\n", reset);
4302 break;
4303 case DIFF_STATUS_MODIFIED:
4304 if (p->score) {
4305 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4306 line_prefix,
4307 set, similarity_index(p), reset);
4308 break;
4309 }
4310 /* fallthru */
4311 default:
4312 *must_show_header = 0;
4313 }
4314 if (one && two && !oideq(&one->oid, &two->oid)) {
4315 const unsigned hexsz = the_hash_algo->hexsz;
4316 int abbrev = o->abbrev ? o->abbrev : DEFAULT_ABBREV;
4317
4318 if (o->flags.full_index)
4319 abbrev = hexsz;
4320
4321 if (o->flags.binary) {
4322 mmfile_t mf;
4323 if ((!fill_mmfile(o->repo, &mf, one) &&
4324 diff_filespec_is_binary(o->repo, one)) ||
4325 (!fill_mmfile(o->repo, &mf, two) &&
4326 diff_filespec_is_binary(o->repo, two)))
4327 abbrev = hexsz;
4328 }
4329 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4330 diff_abbrev_oid(&one->oid, abbrev),
4331 diff_abbrev_oid(&two->oid, abbrev));
4332 if (one->mode == two->mode)
4333 strbuf_addf(msg, " %06o", one->mode);
4334 strbuf_addf(msg, "%s\n", reset);
4335 }
4336 }
4337
4338 static void run_diff_cmd(const char *pgm,
4339 const char *name,
4340 const char *other,
4341 const char *attr_path,
4342 struct diff_filespec *one,
4343 struct diff_filespec *two,
4344 struct strbuf *msg,
4345 struct diff_options *o,
4346 struct diff_filepair *p)
4347 {
4348 const char *xfrm_msg = NULL;
4349 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4350 int must_show_header = 0;
4351
4352
4353 if (o->flags.allow_external) {
4354 struct userdiff_driver *drv;
4355
4356 drv = userdiff_find_by_path(o->repo->index, attr_path);
4357 if (drv && drv->external)
4358 pgm = drv->external;
4359 }
4360
4361 if (msg) {
4362 /*
4363 * don't use colors when the header is intended for an
4364 * external diff driver
4365 */
4366 fill_metainfo(msg, name, other, one, two, o, p,
4367 &must_show_header,
4368 want_color(o->use_color) && !pgm);
4369 xfrm_msg = msg->len ? msg->buf : NULL;
4370 }
4371
4372 if (pgm) {
4373 run_external_diff(pgm, name, other, one, two, xfrm_msg, o);
4374 return;
4375 }
4376 if (one && two)
4377 builtin_diff(name, other ? other : name,
4378 one, two, xfrm_msg, must_show_header,
4379 o, complete_rewrite);
4380 else
4381 fprintf(o->file, "* Unmerged path %s\n", name);
4382 }
4383
4384 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4385 {
4386 if (DIFF_FILE_VALID(one)) {
4387 if (!one->oid_valid) {
4388 struct stat st;
4389 if (one->is_stdin) {
4390 oidclr(&one->oid);
4391 return;
4392 }
4393 if (lstat(one->path, &st) < 0)
4394 die_errno("stat '%s'", one->path);
4395 if (index_path(istate, &one->oid, one->path, &st, 0))
4396 die("cannot hash %s", one->path);
4397 }
4398 }
4399 else
4400 oidclr(&one->oid);
4401 }
4402
4403 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4404 {
4405 /* Strip the prefix but do not molest /dev/null and absolute paths */
4406 if (*namep && !is_absolute_path(*namep)) {
4407 *namep += prefix_length;
4408 if (**namep == '/')
4409 ++*namep;
4410 }
4411 if (*otherp && !is_absolute_path(*otherp)) {
4412 *otherp += prefix_length;
4413 if (**otherp == '/')
4414 ++*otherp;
4415 }
4416 }
4417
4418 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4419 {
4420 const char *pgm = external_diff();
4421 struct strbuf msg;
4422 struct diff_filespec *one = p->one;
4423 struct diff_filespec *two = p->two;
4424 const char *name;
4425 const char *other;
4426 const char *attr_path;
4427
4428 name = one->path;
4429 other = (strcmp(name, two->path) ? two->path : NULL);
4430 attr_path = name;
4431 if (o->prefix_length)
4432 strip_prefix(o->prefix_length, &name, &other);
4433
4434 if (!o->flags.allow_external)
4435 pgm = NULL;
4436
4437 if (DIFF_PAIR_UNMERGED(p)) {
4438 run_diff_cmd(pgm, name, NULL, attr_path,
4439 NULL, NULL, NULL, o, p);
4440 return;
4441 }
4442
4443 diff_fill_oid_info(one, o->repo->index);
4444 diff_fill_oid_info(two, o->repo->index);
4445
4446 if (!pgm &&
4447 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4448 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4449 /*
4450 * a filepair that changes between file and symlink
4451 * needs to be split into deletion and creation.
4452 */
4453 struct diff_filespec *null = alloc_filespec(two->path);
4454 run_diff_cmd(NULL, name, other, attr_path,
4455 one, null, &msg,
4456 o, p);
4457 free(null);
4458 strbuf_release(&msg);
4459
4460 null = alloc_filespec(one->path);
4461 run_diff_cmd(NULL, name, other, attr_path,
4462 null, two, &msg, o, p);
4463 free(null);
4464 }
4465 else
4466 run_diff_cmd(pgm, name, other, attr_path,
4467 one, two, &msg, o, p);
4468
4469 strbuf_release(&msg);
4470 }
4471
4472 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4473 struct diffstat_t *diffstat)
4474 {
4475 const char *name;
4476 const char *other;
4477
4478 if (DIFF_PAIR_UNMERGED(p)) {
4479 /* unmerged */
4480 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4481 diffstat, o, p);
4482 return;
4483 }
4484
4485 name = p->one->path;
4486 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4487
4488 if (o->prefix_length)
4489 strip_prefix(o->prefix_length, &name, &other);
4490
4491 diff_fill_oid_info(p->one, o->repo->index);
4492 diff_fill_oid_info(p->two, o->repo->index);
4493
4494 builtin_diffstat(name, other, p->one, p->two,
4495 diffstat, o, p);
4496 }
4497
4498 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4499 {
4500 const char *name;
4501 const char *other;
4502 const char *attr_path;
4503
4504 if (DIFF_PAIR_UNMERGED(p)) {
4505 /* unmerged */
4506 return;
4507 }
4508
4509 name = p->one->path;
4510 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4511 attr_path = other ? other : name;
4512
4513 if (o->prefix_length)
4514 strip_prefix(o->prefix_length, &name, &other);
4515
4516 diff_fill_oid_info(p->one, o->repo->index);
4517 diff_fill_oid_info(p->two, o->repo->index);
4518
4519 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4520 }
4521
4522 static void prep_parse_options(struct diff_options *options);
4523
4524 void repo_diff_setup(struct repository *r, struct diff_options *options)
4525 {
4526 memcpy(options, &default_diff_options, sizeof(*options));
4527
4528 options->file = stdout;
4529 options->repo = r;
4530
4531 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4532 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4533 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4534 options->abbrev = DEFAULT_ABBREV;
4535 options->line_termination = '\n';
4536 options->break_opt = -1;
4537 options->rename_limit = -1;
4538 options->dirstat_permille = diff_dirstat_permille_default;
4539 options->context = diff_context_default;
4540 options->interhunkcontext = diff_interhunk_context_default;
4541 options->ws_error_highlight = ws_error_highlight_default;
4542 options->flags.rename_empty = 1;
4543 options->flags.relative_name = diff_relative;
4544 options->objfind = NULL;
4545
4546 /* pathchange left =NULL by default */
4547 options->change = diff_change;
4548 options->add_remove = diff_addremove;
4549 options->use_color = diff_use_color_default;
4550 options->detect_rename = diff_detect_rename_default;
4551 options->xdl_opts |= diff_algorithm;
4552 if (diff_indent_heuristic)
4553 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4554
4555 options->orderfile = diff_order_file_cfg;
4556
4557 if (!options->flags.ignore_submodule_set)
4558 options->flags.ignore_untracked_in_submodules = 1;
4559
4560 if (diff_no_prefix) {
4561 options->a_prefix = options->b_prefix = "";
4562 } else if (!diff_mnemonic_prefix) {
4563 options->a_prefix = "a/";
4564 options->b_prefix = "b/";
4565 }
4566
4567 options->color_moved = diff_color_moved_default;
4568 options->color_moved_ws_handling = diff_color_moved_ws_default;
4569
4570 prep_parse_options(options);
4571 }
4572
4573 void diff_setup_done(struct diff_options *options)
4574 {
4575 unsigned check_mask = DIFF_FORMAT_NAME |
4576 DIFF_FORMAT_NAME_STATUS |
4577 DIFF_FORMAT_CHECKDIFF |
4578 DIFF_FORMAT_NO_OUTPUT;
4579 /*
4580 * This must be signed because we're comparing against a potentially
4581 * negative value.
4582 */
4583 const int hexsz = the_hash_algo->hexsz;
4584
4585 if (options->set_default)
4586 options->set_default(options);
4587
4588 if (HAS_MULTI_BITS(options->output_format & check_mask))
4589 die(_("options '%s', '%s', '%s', and '%s' cannot be used together"),
4590 "--name-only", "--name-status", "--check", "-s");
4591
4592 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4593 die(_("options '%s', '%s', and '%s' cannot be used together"),
4594 "-G", "-S", "--find-object");
4595
4596 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_G_REGEX_MASK))
4597 die(_("options '%s' and '%s' cannot be used together, use '%s' with '%s'"),
4598 "-G", "--pickaxe-regex", "--pickaxe-regex", "-S");
4599
4600 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_ALL_OBJFIND_MASK))
4601 die(_("options '%s' and '%s' cannot be used together, use '%s' with '%s' and '%s'"),
4602 "--pickaxe-all", "--find-object", "--pickaxe-all", "-G", "-S");
4603
4604 /*
4605 * Most of the time we can say "there are changes"
4606 * only by checking if there are changed paths, but
4607 * --ignore-whitespace* options force us to look
4608 * inside contents.
4609 */
4610
4611 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS) ||
4612 options->ignore_regex_nr)
4613 options->flags.diff_from_contents = 1;
4614 else
4615 options->flags.diff_from_contents = 0;
4616
4617 if (options->flags.find_copies_harder)
4618 options->detect_rename = DIFF_DETECT_COPY;
4619
4620 if (!options->flags.relative_name)
4621 options->prefix = NULL;
4622 if (options->prefix)
4623 options->prefix_length = strlen(options->prefix);
4624 else
4625 options->prefix_length = 0;
4626
4627 if (options->output_format & (DIFF_FORMAT_NAME |
4628 DIFF_FORMAT_NAME_STATUS |
4629 DIFF_FORMAT_CHECKDIFF |
4630 DIFF_FORMAT_NO_OUTPUT))
4631 options->output_format &= ~(DIFF_FORMAT_RAW |
4632 DIFF_FORMAT_NUMSTAT |
4633 DIFF_FORMAT_DIFFSTAT |
4634 DIFF_FORMAT_SHORTSTAT |
4635 DIFF_FORMAT_DIRSTAT |
4636 DIFF_FORMAT_SUMMARY |
4637 DIFF_FORMAT_PATCH);
4638
4639 /*
4640 * These cases always need recursive; we do not drop caller-supplied
4641 * recursive bits for other formats here.
4642 */
4643 if (options->output_format & (DIFF_FORMAT_PATCH |
4644 DIFF_FORMAT_NUMSTAT |
4645 DIFF_FORMAT_DIFFSTAT |
4646 DIFF_FORMAT_SHORTSTAT |
4647 DIFF_FORMAT_DIRSTAT |
4648 DIFF_FORMAT_SUMMARY |
4649 DIFF_FORMAT_CHECKDIFF))
4650 options->flags.recursive = 1;
4651 /*
4652 * Also pickaxe would not work very well if you do not say recursive
4653 */
4654 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4655 options->flags.recursive = 1;
4656 /*
4657 * When patches are generated, submodules diffed against the work tree
4658 * must be checked for dirtiness too so it can be shown in the output
4659 */
4660 if (options->output_format & DIFF_FORMAT_PATCH)
4661 options->flags.dirty_submodules = 1;
4662
4663 if (options->detect_rename && options->rename_limit < 0)
4664 options->rename_limit = diff_rename_limit_default;
4665 if (hexsz < options->abbrev)
4666 options->abbrev = hexsz; /* full */
4667
4668 /*
4669 * It does not make sense to show the first hit we happened
4670 * to have found. It does not make sense not to return with
4671 * exit code in such a case either.
4672 */
4673 if (options->flags.quick) {
4674 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4675 options->flags.exit_with_status = 1;
4676 }
4677
4678 options->diff_path_counter = 0;
4679
4680 if (options->flags.follow_renames && options->pathspec.nr != 1)
4681 die(_("--follow requires exactly one pathspec"));
4682
4683 if (!options->use_color || external_diff())
4684 options->color_moved = 0;
4685
4686 FREE_AND_NULL(options->parseopts);
4687 }
4688
4689 int parse_long_opt(const char *opt, const char **argv,
4690 const char **optarg)
4691 {
4692 const char *arg = argv[0];
4693 if (!skip_prefix(arg, "--", &arg))
4694 return 0;
4695 if (!skip_prefix(arg, opt, &arg))
4696 return 0;
4697 if (*arg == '=') { /* stuck form: --option=value */
4698 *optarg = arg + 1;
4699 return 1;
4700 }
4701 if (*arg != '\0')
4702 return 0;
4703 /* separate form: --option value */
4704 if (!argv[1])
4705 die("Option '--%s' requires a value", opt);
4706 *optarg = argv[1];
4707 return 2;
4708 }
4709
4710 static int diff_opt_stat(const struct option *opt, const char *value, int unset)
4711 {
4712 struct diff_options *options = opt->value;
4713 int width = options->stat_width;
4714 int name_width = options->stat_name_width;
4715 int graph_width = options->stat_graph_width;
4716 int count = options->stat_count;
4717 char *end;
4718
4719 BUG_ON_OPT_NEG(unset);
4720
4721 if (!strcmp(opt->long_name, "stat")) {
4722 if (value) {
4723 width = strtoul(value, &end, 10);
4724 if (*end == ',')
4725 name_width = strtoul(end+1, &end, 10);
4726 if (*end == ',')
4727 count = strtoul(end+1, &end, 10);
4728 if (*end)
4729 return error(_("invalid --stat value: %s"), value);
4730 }
4731 } else if (!strcmp(opt->long_name, "stat-width")) {
4732 width = strtoul(value, &end, 10);
4733 if (*end)
4734 return error(_("%s expects a numerical value"),
4735 opt->long_name);
4736 } else if (!strcmp(opt->long_name, "stat-name-width")) {
4737 name_width = strtoul(value, &end, 10);
4738 if (*end)
4739 return error(_("%s expects a numerical value"),
4740 opt->long_name);
4741 } else if (!strcmp(opt->long_name, "stat-graph-width")) {
4742 graph_width = strtoul(value, &end, 10);
4743 if (*end)
4744 return error(_("%s expects a numerical value"),
4745 opt->long_name);
4746 } else if (!strcmp(opt->long_name, "stat-count")) {
4747 count = strtoul(value, &end, 10);
4748 if (*end)
4749 return error(_("%s expects a numerical value"),
4750 opt->long_name);
4751 } else
4752 BUG("%s should not get here", opt->long_name);
4753
4754 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4755 options->stat_name_width = name_width;
4756 options->stat_graph_width = graph_width;
4757 options->stat_width = width;
4758 options->stat_count = count;
4759 return 0;
4760 }
4761
4762 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4763 {
4764 struct strbuf errmsg = STRBUF_INIT;
4765 if (parse_dirstat_params(options, params, &errmsg))
4766 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4767 errmsg.buf);
4768 strbuf_release(&errmsg);
4769 /*
4770 * The caller knows a dirstat-related option is given from the command
4771 * line; allow it to say "return this_function();"
4772 */
4773 options->output_format |= DIFF_FORMAT_DIRSTAT;
4774 return 1;
4775 }
4776
4777 static const char diff_status_letters[] = {
4778 DIFF_STATUS_ADDED,
4779 DIFF_STATUS_COPIED,
4780 DIFF_STATUS_DELETED,
4781 DIFF_STATUS_MODIFIED,
4782 DIFF_STATUS_RENAMED,
4783 DIFF_STATUS_TYPE_CHANGED,
4784 DIFF_STATUS_UNKNOWN,
4785 DIFF_STATUS_UNMERGED,
4786 DIFF_STATUS_FILTER_AON,
4787 DIFF_STATUS_FILTER_BROKEN,
4788 '\0',
4789 };
4790
4791 static unsigned int filter_bit['Z' + 1];
4792
4793 static void prepare_filter_bits(void)
4794 {
4795 int i;
4796
4797 if (!filter_bit[DIFF_STATUS_ADDED]) {
4798 for (i = 0; diff_status_letters[i]; i++)
4799 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4800 }
4801 }
4802
4803 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4804 {
4805 return opt->filter & filter_bit[(int) status];
4806 }
4807
4808 unsigned diff_filter_bit(char status)
4809 {
4810 prepare_filter_bits();
4811 return filter_bit[(int) status];
4812 }
4813
4814 static int diff_opt_diff_filter(const struct option *option,
4815 const char *optarg, int unset)
4816 {
4817 struct diff_options *opt = option->value;
4818 int i, optch;
4819
4820 BUG_ON_OPT_NEG(unset);
4821 prepare_filter_bits();
4822
4823 /*
4824 * If there is a negation e.g. 'd' in the input, and we haven't
4825 * initialized the filter field with another --diff-filter, start
4826 * from full set of bits, except for AON.
4827 */
4828 if (!opt->filter) {
4829 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4830 if (optch < 'a' || 'z' < optch)
4831 continue;
4832 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4833 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4834 break;
4835 }
4836 }
4837
4838 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4839 unsigned int bit;
4840 int negate;
4841
4842 if ('a' <= optch && optch <= 'z') {
4843 negate = 1;
4844 optch = toupper(optch);
4845 } else {
4846 negate = 0;
4847 }
4848
4849 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4850 if (!bit)
4851 return error(_("unknown change class '%c' in --diff-filter=%s"),
4852 optarg[i], optarg);
4853 if (negate)
4854 opt->filter &= ~bit;
4855 else
4856 opt->filter |= bit;
4857 }
4858 return 0;
4859 }
4860
4861 static void enable_patch_output(int *fmt)
4862 {
4863 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4864 *fmt |= DIFF_FORMAT_PATCH;
4865 }
4866
4867 static int diff_opt_ws_error_highlight(const struct option *option,
4868 const char *arg, int unset)
4869 {
4870 struct diff_options *opt = option->value;
4871 int val = parse_ws_error_highlight(arg);
4872
4873 BUG_ON_OPT_NEG(unset);
4874 if (val < 0)
4875 return error(_("unknown value after ws-error-highlight=%.*s"),
4876 -1 - val, arg);
4877 opt->ws_error_highlight = val;
4878 return 0;
4879 }
4880
4881 static int diff_opt_find_object(const struct option *option,
4882 const char *arg, int unset)
4883 {
4884 struct diff_options *opt = option->value;
4885 struct object_id oid;
4886
4887 BUG_ON_OPT_NEG(unset);
4888 if (get_oid(arg, &oid))
4889 return error(_("unable to resolve '%s'"), arg);
4890
4891 if (!opt->objfind)
4892 CALLOC_ARRAY(opt->objfind, 1);
4893
4894 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4895 opt->flags.recursive = 1;
4896 opt->flags.tree_in_recursive = 1;
4897 oidset_insert(opt->objfind, &oid);
4898 return 0;
4899 }
4900
4901 static int diff_opt_anchored(const struct option *opt,
4902 const char *arg, int unset)
4903 {
4904 struct diff_options *options = opt->value;
4905
4906 BUG_ON_OPT_NEG(unset);
4907 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4908 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4909 options->anchors_alloc);
4910 options->anchors[options->anchors_nr++] = xstrdup(arg);
4911 return 0;
4912 }
4913
4914 static int diff_opt_binary(const struct option *opt,
4915 const char *arg, int unset)
4916 {
4917 struct diff_options *options = opt->value;
4918
4919 BUG_ON_OPT_NEG(unset);
4920 BUG_ON_OPT_ARG(arg);
4921 enable_patch_output(&options->output_format);
4922 options->flags.binary = 1;
4923 return 0;
4924 }
4925
4926 static int diff_opt_break_rewrites(const struct option *opt,
4927 const char *arg, int unset)
4928 {
4929 int *break_opt = opt->value;
4930 int opt1, opt2;
4931
4932 BUG_ON_OPT_NEG(unset);
4933 if (!arg)
4934 arg = "";
4935 opt1 = parse_rename_score(&arg);
4936 if (*arg == 0)
4937 opt2 = 0;
4938 else if (*arg != '/')
4939 return error(_("%s expects <n>/<m> form"), opt->long_name);
4940 else {
4941 arg++;
4942 opt2 = parse_rename_score(&arg);
4943 }
4944 if (*arg != 0)
4945 return error(_("%s expects <n>/<m> form"), opt->long_name);
4946 *break_opt = opt1 | (opt2 << 16);
4947 return 0;
4948 }
4949
4950 static int diff_opt_char(const struct option *opt,
4951 const char *arg, int unset)
4952 {
4953 char *value = opt->value;
4954
4955 BUG_ON_OPT_NEG(unset);
4956 if (arg[1])
4957 return error(_("%s expects a character, got '%s'"),
4958 opt->long_name, arg);
4959 *value = arg[0];
4960 return 0;
4961 }
4962
4963 static int diff_opt_color_moved(const struct option *opt,
4964 const char *arg, int unset)
4965 {
4966 struct diff_options *options = opt->value;
4967
4968 if (unset) {
4969 options->color_moved = COLOR_MOVED_NO;
4970 } else if (!arg) {
4971 if (diff_color_moved_default)
4972 options->color_moved = diff_color_moved_default;
4973 if (options->color_moved == COLOR_MOVED_NO)
4974 options->color_moved = COLOR_MOVED_DEFAULT;
4975 } else {
4976 int cm = parse_color_moved(arg);
4977 if (cm < 0)
4978 return error(_("bad --color-moved argument: %s"), arg);
4979 options->color_moved = cm;
4980 }
4981 return 0;
4982 }
4983
4984 static int diff_opt_color_moved_ws(const struct option *opt,
4985 const char *arg, int unset)
4986 {
4987 struct diff_options *options = opt->value;
4988 unsigned cm;
4989
4990 if (unset) {
4991 options->color_moved_ws_handling = 0;
4992 return 0;
4993 }
4994
4995 cm = parse_color_moved_ws(arg);
4996 if (cm & COLOR_MOVED_WS_ERROR)
4997 return error(_("invalid mode '%s' in --color-moved-ws"), arg);
4998 options->color_moved_ws_handling = cm;
4999 return 0;
5000 }
5001
5002 static int diff_opt_color_words(const struct option *opt,
5003 const char *arg, int unset)
5004 {
5005 struct diff_options *options = opt->value;
5006
5007 BUG_ON_OPT_NEG(unset);
5008 options->use_color = 1;
5009 options->word_diff = DIFF_WORDS_COLOR;
5010 options->word_regex = arg;
5011 return 0;
5012 }
5013
5014 static int diff_opt_compact_summary(const struct option *opt,
5015 const char *arg, int unset)
5016 {
5017 struct diff_options *options = opt->value;
5018
5019 BUG_ON_OPT_ARG(arg);
5020 if (unset) {
5021 options->flags.stat_with_summary = 0;
5022 } else {
5023 options->flags.stat_with_summary = 1;
5024 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5025 }
5026 return 0;
5027 }
5028
5029 static int diff_opt_diff_algorithm(const struct option *opt,
5030 const char *arg, int unset)
5031 {
5032 struct diff_options *options = opt->value;
5033 long value = parse_algorithm_value(arg);
5034
5035 BUG_ON_OPT_NEG(unset);
5036 if (value < 0)
5037 return error(_("option diff-algorithm accepts \"myers\", "
5038 "\"minimal\", \"patience\" and \"histogram\""));
5039
5040 /* clear out previous settings */
5041 DIFF_XDL_CLR(options, NEED_MINIMAL);
5042 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
5043 options->xdl_opts |= value;
5044 return 0;
5045 }
5046
5047 static int diff_opt_dirstat(const struct option *opt,
5048 const char *arg, int unset)
5049 {
5050 struct diff_options *options = opt->value;
5051
5052 BUG_ON_OPT_NEG(unset);
5053 if (!strcmp(opt->long_name, "cumulative")) {
5054 if (arg)
5055 BUG("how come --cumulative take a value?");
5056 arg = "cumulative";
5057 } else if (!strcmp(opt->long_name, "dirstat-by-file"))
5058 parse_dirstat_opt(options, "files");
5059 parse_dirstat_opt(options, arg ? arg : "");
5060 return 0;
5061 }
5062
5063 static int diff_opt_find_copies(const struct option *opt,
5064 const char *arg, int unset)
5065 {
5066 struct diff_options *options = opt->value;
5067
5068 BUG_ON_OPT_NEG(unset);
5069 if (!arg)
5070 arg = "";
5071 options->rename_score = parse_rename_score(&arg);
5072 if (*arg != 0)
5073 return error(_("invalid argument to %s"), opt->long_name);
5074
5075 if (options->detect_rename == DIFF_DETECT_COPY)
5076 options->flags.find_copies_harder = 1;
5077 else
5078 options->detect_rename = DIFF_DETECT_COPY;
5079
5080 return 0;
5081 }
5082
5083 static int diff_opt_find_renames(const struct option *opt,
5084 const char *arg, int unset)
5085 {
5086 struct diff_options *options = opt->value;
5087
5088 BUG_ON_OPT_NEG(unset);
5089 if (!arg)
5090 arg = "";
5091 options->rename_score = parse_rename_score(&arg);
5092 if (*arg != 0)
5093 return error(_("invalid argument to %s"), opt->long_name);
5094
5095 options->detect_rename = DIFF_DETECT_RENAME;
5096 return 0;
5097 }
5098
5099 static int diff_opt_follow(const struct option *opt,
5100 const char *arg, int unset)
5101 {
5102 struct diff_options *options = opt->value;
5103
5104 BUG_ON_OPT_ARG(arg);
5105 if (unset) {
5106 options->flags.follow_renames = 0;
5107 options->flags.default_follow_renames = 0;
5108 } else {
5109 options->flags.follow_renames = 1;
5110 }
5111 return 0;
5112 }
5113
5114 static int diff_opt_ignore_submodules(const struct option *opt,
5115 const char *arg, int unset)
5116 {
5117 struct diff_options *options = opt->value;
5118
5119 BUG_ON_OPT_NEG(unset);
5120 if (!arg)
5121 arg = "all";
5122 options->flags.override_submodule_config = 1;
5123 handle_ignore_submodules_arg(options, arg);
5124 return 0;
5125 }
5126
5127 static int diff_opt_line_prefix(const struct option *opt,
5128 const char *optarg, int unset)
5129 {
5130 struct diff_options *options = opt->value;
5131
5132 BUG_ON_OPT_NEG(unset);
5133 options->line_prefix = optarg;
5134 options->line_prefix_length = strlen(options->line_prefix);
5135 graph_setup_line_prefix(options);
5136 return 0;
5137 }
5138
5139 static int diff_opt_no_prefix(const struct option *opt,
5140 const char *optarg, int unset)
5141 {
5142 struct diff_options *options = opt->value;
5143
5144 BUG_ON_OPT_NEG(unset);
5145 BUG_ON_OPT_ARG(optarg);
5146 options->a_prefix = "";
5147 options->b_prefix = "";
5148 return 0;
5149 }
5150
5151 static enum parse_opt_result diff_opt_output(struct parse_opt_ctx_t *ctx,
5152 const struct option *opt,
5153 const char *arg, int unset)
5154 {
5155 struct diff_options *options = opt->value;
5156 char *path;
5157
5158 BUG_ON_OPT_NEG(unset);
5159 path = prefix_filename(ctx->prefix, arg);
5160 options->file = xfopen(path, "w");
5161 options->close_file = 1;
5162 if (options->use_color != GIT_COLOR_ALWAYS)
5163 options->use_color = GIT_COLOR_NEVER;
5164 free(path);
5165 return 0;
5166 }
5167
5168 static int diff_opt_patience(const struct option *opt,
5169 const char *arg, int unset)
5170 {
5171 struct diff_options *options = opt->value;
5172 int i;
5173
5174 BUG_ON_OPT_NEG(unset);
5175 BUG_ON_OPT_ARG(arg);
5176 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
5177 /*
5178 * Both --patience and --anchored use PATIENCE_DIFF
5179 * internally, so remove any anchors previously
5180 * specified.
5181 */
5182 for (i = 0; i < options->anchors_nr; i++)
5183 free(options->anchors[i]);
5184 options->anchors_nr = 0;
5185 return 0;
5186 }
5187
5188 static int diff_opt_ignore_regex(const struct option *opt,
5189 const char *arg, int unset)
5190 {
5191 struct diff_options *options = opt->value;
5192 regex_t *regex;
5193
5194 BUG_ON_OPT_NEG(unset);
5195 regex = xmalloc(sizeof(*regex));
5196 if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE))
5197 return error(_("invalid regex given to -I: '%s'"), arg);
5198 ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1,
5199 options->ignore_regex_alloc);
5200 options->ignore_regex[options->ignore_regex_nr++] = regex;
5201 return 0;
5202 }
5203
5204 static int diff_opt_pickaxe_regex(const struct option *opt,
5205 const char *arg, int unset)
5206 {
5207 struct diff_options *options = opt->value;
5208
5209 BUG_ON_OPT_NEG(unset);
5210 options->pickaxe = arg;
5211 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5212 return 0;
5213 }
5214
5215 static int diff_opt_pickaxe_string(const struct option *opt,
5216 const char *arg, int unset)
5217 {
5218 struct diff_options *options = opt->value;
5219
5220 BUG_ON_OPT_NEG(unset);
5221 options->pickaxe = arg;
5222 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5223 return 0;
5224 }
5225
5226 static int diff_opt_relative(const struct option *opt,
5227 const char *arg, int unset)
5228 {
5229 struct diff_options *options = opt->value;
5230
5231 options->flags.relative_name = !unset;
5232 if (arg)
5233 options->prefix = arg;
5234 return 0;
5235 }
5236
5237 static int diff_opt_submodule(const struct option *opt,
5238 const char *arg, int unset)
5239 {
5240 struct diff_options *options = opt->value;
5241
5242 BUG_ON_OPT_NEG(unset);
5243 if (!arg)
5244 arg = "log";
5245 if (parse_submodule_params(options, arg))
5246 return error(_("failed to parse --submodule option parameter: '%s'"),
5247 arg);
5248 return 0;
5249 }
5250
5251 static int diff_opt_textconv(const struct option *opt,
5252 const char *arg, int unset)
5253 {
5254 struct diff_options *options = opt->value;
5255
5256 BUG_ON_OPT_ARG(arg);
5257 if (unset) {
5258 options->flags.allow_textconv = 0;
5259 } else {
5260 options->flags.allow_textconv = 1;
5261 options->flags.textconv_set_via_cmdline = 1;
5262 }
5263 return 0;
5264 }
5265
5266 static int diff_opt_unified(const struct option *opt,
5267 const char *arg, int unset)
5268 {
5269 struct diff_options *options = opt->value;
5270 char *s;
5271
5272 BUG_ON_OPT_NEG(unset);
5273
5274 if (arg) {
5275 options->context = strtol(arg, &s, 10);
5276 if (*s)
5277 return error(_("%s expects a numerical value"), "--unified");
5278 }
5279 enable_patch_output(&options->output_format);
5280
5281 return 0;
5282 }
5283
5284 static int diff_opt_word_diff(const struct option *opt,
5285 const char *arg, int unset)
5286 {
5287 struct diff_options *options = opt->value;
5288
5289 BUG_ON_OPT_NEG(unset);
5290 if (arg) {
5291 if (!strcmp(arg, "plain"))
5292 options->word_diff = DIFF_WORDS_PLAIN;
5293 else if (!strcmp(arg, "color")) {
5294 options->use_color = 1;
5295 options->word_diff = DIFF_WORDS_COLOR;
5296 }
5297 else if (!strcmp(arg, "porcelain"))
5298 options->word_diff = DIFF_WORDS_PORCELAIN;
5299 else if (!strcmp(arg, "none"))
5300 options->word_diff = DIFF_WORDS_NONE;
5301 else
5302 return error(_("bad --word-diff argument: %s"), arg);
5303 } else {
5304 if (options->word_diff == DIFF_WORDS_NONE)
5305 options->word_diff = DIFF_WORDS_PLAIN;
5306 }
5307 return 0;
5308 }
5309
5310 static int diff_opt_word_diff_regex(const struct option *opt,
5311 const char *arg, int unset)
5312 {
5313 struct diff_options *options = opt->value;
5314
5315 BUG_ON_OPT_NEG(unset);
5316 if (options->word_diff == DIFF_WORDS_NONE)
5317 options->word_diff = DIFF_WORDS_PLAIN;
5318 options->word_regex = arg;
5319 return 0;
5320 }
5321
5322 static int diff_opt_rotate_to(const struct option *opt, const char *arg, int unset)
5323 {
5324 struct diff_options *options = opt->value;
5325
5326 BUG_ON_OPT_NEG(unset);
5327 if (!strcmp(opt->long_name, "skip-to"))
5328 options->skip_instead_of_rotate = 1;
5329 else
5330 options->skip_instead_of_rotate = 0;
5331 options->rotate_to = arg;
5332 return 0;
5333 }
5334
5335 static void prep_parse_options(struct diff_options *options)
5336 {
5337 struct option parseopts[] = {
5338 OPT_GROUP(N_("Diff output format options")),
5339 OPT_BITOP('p', "patch", &options->output_format,
5340 N_("generate patch"),
5341 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5342 OPT_BIT_F('s', "no-patch", &options->output_format,
5343 N_("suppress diff output"),
5344 DIFF_FORMAT_NO_OUTPUT, PARSE_OPT_NONEG),
5345 OPT_BITOP('u', NULL, &options->output_format,
5346 N_("generate patch"),
5347 DIFF_FORMAT_PATCH, DIFF_FORMAT_NO_OUTPUT),
5348 OPT_CALLBACK_F('U', "unified", options, N_("<n>"),
5349 N_("generate diffs with <n> lines context"),
5350 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_unified),
5351 OPT_BOOL('W', "function-context", &options->flags.funccontext,
5352 N_("generate diffs with <n> lines context")),
5353 OPT_BIT_F(0, "raw", &options->output_format,
5354 N_("generate the diff in raw format"),
5355 DIFF_FORMAT_RAW, PARSE_OPT_NONEG),
5356 OPT_BITOP(0, "patch-with-raw", &options->output_format,
5357 N_("synonym for '-p --raw'"),
5358 DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW,
5359 DIFF_FORMAT_NO_OUTPUT),
5360 OPT_BITOP(0, "patch-with-stat", &options->output_format,
5361 N_("synonym for '-p --stat'"),
5362 DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT,
5363 DIFF_FORMAT_NO_OUTPUT),
5364 OPT_BIT_F(0, "numstat", &options->output_format,
5365 N_("machine friendly --stat"),
5366 DIFF_FORMAT_NUMSTAT, PARSE_OPT_NONEG),
5367 OPT_BIT_F(0, "shortstat", &options->output_format,
5368 N_("output only the last line of --stat"),
5369 DIFF_FORMAT_SHORTSTAT, PARSE_OPT_NONEG),
5370 OPT_CALLBACK_F('X', "dirstat", options, N_("<param1,param2>..."),
5371 N_("output the distribution of relative amount of changes for each sub-directory"),
5372 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5373 diff_opt_dirstat),
5374 OPT_CALLBACK_F(0, "cumulative", options, NULL,
5375 N_("synonym for --dirstat=cumulative"),
5376 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5377 diff_opt_dirstat),
5378 OPT_CALLBACK_F(0, "dirstat-by-file", options, N_("<param1,param2>..."),
5379 N_("synonym for --dirstat=files,param1,param2..."),
5380 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5381 diff_opt_dirstat),
5382 OPT_BIT_F(0, "check", &options->output_format,
5383 N_("warn if changes introduce conflict markers or whitespace errors"),
5384 DIFF_FORMAT_CHECKDIFF, PARSE_OPT_NONEG),
5385 OPT_BIT_F(0, "summary", &options->output_format,
5386 N_("condensed summary such as creations, renames and mode changes"),
5387 DIFF_FORMAT_SUMMARY, PARSE_OPT_NONEG),
5388 OPT_BIT_F(0, "name-only", &options->output_format,
5389 N_("show only names of changed files"),
5390 DIFF_FORMAT_NAME, PARSE_OPT_NONEG),
5391 OPT_BIT_F(0, "name-status", &options->output_format,
5392 N_("show only names and status of changed files"),
5393 DIFF_FORMAT_NAME_STATUS, PARSE_OPT_NONEG),
5394 OPT_CALLBACK_F(0, "stat", options, N_("<width>[,<name-width>[,<count>]]"),
5395 N_("generate diffstat"),
5396 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_stat),
5397 OPT_CALLBACK_F(0, "stat-width", options, N_("<width>"),
5398 N_("generate diffstat with a given width"),
5399 PARSE_OPT_NONEG, diff_opt_stat),
5400 OPT_CALLBACK_F(0, "stat-name-width", options, N_("<width>"),
5401 N_("generate diffstat with a given name width"),
5402 PARSE_OPT_NONEG, diff_opt_stat),
5403 OPT_CALLBACK_F(0, "stat-graph-width", options, N_("<width>"),
5404 N_("generate diffstat with a given graph width"),
5405 PARSE_OPT_NONEG, diff_opt_stat),
5406 OPT_CALLBACK_F(0, "stat-count", options, N_("<count>"),
5407 N_("generate diffstat with limited lines"),
5408 PARSE_OPT_NONEG, diff_opt_stat),
5409 OPT_CALLBACK_F(0, "compact-summary", options, NULL,
5410 N_("generate compact summary in diffstat"),
5411 PARSE_OPT_NOARG, diff_opt_compact_summary),
5412 OPT_CALLBACK_F(0, "binary", options, NULL,
5413 N_("output a binary diff that can be applied"),
5414 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_binary),
5415 OPT_BOOL(0, "full-index", &options->flags.full_index,
5416 N_("show full pre- and post-image object names on the \"index\" lines")),
5417 OPT_COLOR_FLAG(0, "color", &options->use_color,
5418 N_("show colored diff")),
5419 OPT_CALLBACK_F(0, "ws-error-highlight", options, N_("<kind>"),
5420 N_("highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff"),
5421 PARSE_OPT_NONEG, diff_opt_ws_error_highlight),
5422 OPT_SET_INT('z', NULL, &options->line_termination,
5423 N_("do not munge pathnames and use NULs as output field terminators in --raw or --numstat"),
5424 0),
5425 OPT__ABBREV(&options->abbrev),
5426 OPT_STRING_F(0, "src-prefix", &options->a_prefix, N_("<prefix>"),
5427 N_("show the given source prefix instead of \"a/\""),
5428 PARSE_OPT_NONEG),
5429 OPT_STRING_F(0, "dst-prefix", &options->b_prefix, N_("<prefix>"),
5430 N_("show the given destination prefix instead of \"b/\""),
5431 PARSE_OPT_NONEG),
5432 OPT_CALLBACK_F(0, "line-prefix", options, N_("<prefix>"),
5433 N_("prepend an additional prefix to every line of output"),
5434 PARSE_OPT_NONEG, diff_opt_line_prefix),
5435 OPT_CALLBACK_F(0, "no-prefix", options, NULL,
5436 N_("do not show any source or destination prefix"),
5437 PARSE_OPT_NONEG | PARSE_OPT_NOARG, diff_opt_no_prefix),
5438 OPT_INTEGER_F(0, "inter-hunk-context", &options->interhunkcontext,
5439 N_("show context between diff hunks up to the specified number of lines"),
5440 PARSE_OPT_NONEG),
5441 OPT_CALLBACK_F(0, "output-indicator-new",
5442 &options->output_indicators[OUTPUT_INDICATOR_NEW],
5443 N_("<char>"),
5444 N_("specify the character to indicate a new line instead of '+'"),
5445 PARSE_OPT_NONEG, diff_opt_char),
5446 OPT_CALLBACK_F(0, "output-indicator-old",
5447 &options->output_indicators[OUTPUT_INDICATOR_OLD],
5448 N_("<char>"),
5449 N_("specify the character to indicate an old line instead of '-'"),
5450 PARSE_OPT_NONEG, diff_opt_char),
5451 OPT_CALLBACK_F(0, "output-indicator-context",
5452 &options->output_indicators[OUTPUT_INDICATOR_CONTEXT],
5453 N_("<char>"),
5454 N_("specify the character to indicate a context instead of ' '"),
5455 PARSE_OPT_NONEG, diff_opt_char),
5456
5457 OPT_GROUP(N_("Diff rename options")),
5458 OPT_CALLBACK_F('B', "break-rewrites", &options->break_opt, N_("<n>[/<m>]"),
5459 N_("break complete rewrite changes into pairs of delete and create"),
5460 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5461 diff_opt_break_rewrites),
5462 OPT_CALLBACK_F('M', "find-renames", options, N_("<n>"),
5463 N_("detect renames"),
5464 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5465 diff_opt_find_renames),
5466 OPT_SET_INT_F('D', "irreversible-delete", &options->irreversible_delete,
5467 N_("omit the preimage for deletes"),
5468 1, PARSE_OPT_NONEG),
5469 OPT_CALLBACK_F('C', "find-copies", options, N_("<n>"),
5470 N_("detect copies"),
5471 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5472 diff_opt_find_copies),
5473 OPT_BOOL(0, "find-copies-harder", &options->flags.find_copies_harder,
5474 N_("use unmodified files as source to find copies")),
5475 OPT_SET_INT_F(0, "no-renames", &options->detect_rename,
5476 N_("disable rename detection"),
5477 0, PARSE_OPT_NONEG),
5478 OPT_BOOL(0, "rename-empty", &options->flags.rename_empty,
5479 N_("use empty blobs as rename source")),
5480 OPT_CALLBACK_F(0, "follow", options, NULL,
5481 N_("continue listing the history of a file beyond renames"),
5482 PARSE_OPT_NOARG, diff_opt_follow),
5483 OPT_INTEGER('l', NULL, &options->rename_limit,
5484 N_("prevent rename/copy detection if the number of rename/copy targets exceeds given limit")),
5485
5486 OPT_GROUP(N_("Diff algorithm options")),
5487 OPT_BIT(0, "minimal", &options->xdl_opts,
5488 N_("produce the smallest possible diff"),
5489 XDF_NEED_MINIMAL),
5490 OPT_BIT_F('w', "ignore-all-space", &options->xdl_opts,
5491 N_("ignore whitespace when comparing lines"),
5492 XDF_IGNORE_WHITESPACE, PARSE_OPT_NONEG),
5493 OPT_BIT_F('b', "ignore-space-change", &options->xdl_opts,
5494 N_("ignore changes in amount of whitespace"),
5495 XDF_IGNORE_WHITESPACE_CHANGE, PARSE_OPT_NONEG),
5496 OPT_BIT_F(0, "ignore-space-at-eol", &options->xdl_opts,
5497 N_("ignore changes in whitespace at EOL"),
5498 XDF_IGNORE_WHITESPACE_AT_EOL, PARSE_OPT_NONEG),
5499 OPT_BIT_F(0, "ignore-cr-at-eol", &options->xdl_opts,
5500 N_("ignore carrier-return at the end of line"),
5501 XDF_IGNORE_CR_AT_EOL, PARSE_OPT_NONEG),
5502 OPT_BIT_F(0, "ignore-blank-lines", &options->xdl_opts,
5503 N_("ignore changes whose lines are all blank"),
5504 XDF_IGNORE_BLANK_LINES, PARSE_OPT_NONEG),
5505 OPT_CALLBACK_F('I', "ignore-matching-lines", options, N_("<regex>"),
5506 N_("ignore changes whose all lines match <regex>"),
5507 0, diff_opt_ignore_regex),
5508 OPT_BIT(0, "indent-heuristic", &options->xdl_opts,
5509 N_("heuristic to shift diff hunk boundaries for easy reading"),
5510 XDF_INDENT_HEURISTIC),
5511 OPT_CALLBACK_F(0, "patience", options, NULL,
5512 N_("generate diff using the \"patience diff\" algorithm"),
5513 PARSE_OPT_NONEG | PARSE_OPT_NOARG,
5514 diff_opt_patience),
5515 OPT_BITOP(0, "histogram", &options->xdl_opts,
5516 N_("generate diff using the \"histogram diff\" algorithm"),
5517 XDF_HISTOGRAM_DIFF, XDF_DIFF_ALGORITHM_MASK),
5518 OPT_CALLBACK_F(0, "diff-algorithm", options, N_("<algorithm>"),
5519 N_("choose a diff algorithm"),
5520 PARSE_OPT_NONEG, diff_opt_diff_algorithm),
5521 OPT_CALLBACK_F(0, "anchored", options, N_("<text>"),
5522 N_("generate diff using the \"anchored diff\" algorithm"),
5523 PARSE_OPT_NONEG, diff_opt_anchored),
5524 OPT_CALLBACK_F(0, "word-diff", options, N_("<mode>"),
5525 N_("show word diff, using <mode> to delimit changed words"),
5526 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_word_diff),
5527 OPT_CALLBACK_F(0, "word-diff-regex", options, N_("<regex>"),
5528 N_("use <regex> to decide what a word is"),
5529 PARSE_OPT_NONEG, diff_opt_word_diff_regex),
5530 OPT_CALLBACK_F(0, "color-words", options, N_("<regex>"),
5531 N_("equivalent to --word-diff=color --word-diff-regex=<regex>"),
5532 PARSE_OPT_NONEG | PARSE_OPT_OPTARG, diff_opt_color_words),
5533 OPT_CALLBACK_F(0, "color-moved", options, N_("<mode>"),
5534 N_("moved lines of code are colored differently"),
5535 PARSE_OPT_OPTARG, diff_opt_color_moved),
5536 OPT_CALLBACK_F(0, "color-moved-ws", options, N_("<mode>"),
5537 N_("how white spaces are ignored in --color-moved"),
5538 0, diff_opt_color_moved_ws),
5539
5540 OPT_GROUP(N_("Other diff options")),
5541 OPT_CALLBACK_F(0, "relative", options, N_("<prefix>"),
5542 N_("when run from subdir, exclude changes outside and show relative paths"),
5543 PARSE_OPT_OPTARG,
5544 diff_opt_relative),
5545 OPT_BOOL('a', "text", &options->flags.text,
5546 N_("treat all files as text")),
5547 OPT_BOOL('R', NULL, &options->flags.reverse_diff,
5548 N_("swap two inputs, reverse the diff")),
5549 OPT_BOOL(0, "exit-code", &options->flags.exit_with_status,
5550 N_("exit with 1 if there were differences, 0 otherwise")),
5551 OPT_BOOL(0, "quiet", &options->flags.quick,
5552 N_("disable all output of the program")),
5553 OPT_BOOL(0, "ext-diff", &options->flags.allow_external,
5554 N_("allow an external diff helper to be executed")),
5555 OPT_CALLBACK_F(0, "textconv", options, NULL,
5556 N_("run external text conversion filters when comparing binary files"),
5557 PARSE_OPT_NOARG, diff_opt_textconv),
5558 OPT_CALLBACK_F(0, "ignore-submodules", options, N_("<when>"),
5559 N_("ignore changes to submodules in the diff generation"),
5560 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5561 diff_opt_ignore_submodules),
5562 OPT_CALLBACK_F(0, "submodule", options, N_("<format>"),
5563 N_("specify how differences in submodules are shown"),
5564 PARSE_OPT_NONEG | PARSE_OPT_OPTARG,
5565 diff_opt_submodule),
5566 OPT_SET_INT_F(0, "ita-invisible-in-index", &options->ita_invisible_in_index,
5567 N_("hide 'git add -N' entries from the index"),
5568 1, PARSE_OPT_NONEG),
5569 OPT_SET_INT_F(0, "ita-visible-in-index", &options->ita_invisible_in_index,
5570 N_("treat 'git add -N' entries as real in the index"),
5571 0, PARSE_OPT_NONEG),
5572 OPT_CALLBACK_F('S', NULL, options, N_("<string>"),
5573 N_("look for differences that change the number of occurrences of the specified string"),
5574 0, diff_opt_pickaxe_string),
5575 OPT_CALLBACK_F('G', NULL, options, N_("<regex>"),
5576 N_("look for differences that change the number of occurrences of the specified regex"),
5577 0, diff_opt_pickaxe_regex),
5578 OPT_BIT_F(0, "pickaxe-all", &options->pickaxe_opts,
5579 N_("show all changes in the changeset with -S or -G"),
5580 DIFF_PICKAXE_ALL, PARSE_OPT_NONEG),
5581 OPT_BIT_F(0, "pickaxe-regex", &options->pickaxe_opts,
5582 N_("treat <string> in -S as extended POSIX regular expression"),
5583 DIFF_PICKAXE_REGEX, PARSE_OPT_NONEG),
5584 OPT_FILENAME('O', NULL, &options->orderfile,
5585 N_("control the order in which files appear in the output")),
5586 OPT_CALLBACK_F(0, "rotate-to", options, N_("<path>"),
5587 N_("show the change in the specified path first"),
5588 PARSE_OPT_NONEG, diff_opt_rotate_to),
5589 OPT_CALLBACK_F(0, "skip-to", options, N_("<path>"),
5590 N_("skip the output to the specified path"),
5591 PARSE_OPT_NONEG, diff_opt_rotate_to),
5592 OPT_CALLBACK_F(0, "find-object", options, N_("<object-id>"),
5593 N_("look for differences that change the number of occurrences of the specified object"),
5594 PARSE_OPT_NONEG, diff_opt_find_object),
5595 OPT_CALLBACK_F(0, "diff-filter", options, N_("[(A|C|D|M|R|T|U|X|B)...[*]]"),
5596 N_("select files by diff type"),
5597 PARSE_OPT_NONEG, diff_opt_diff_filter),
5598 { OPTION_CALLBACK, 0, "output", options, N_("<file>"),
5599 N_("Output to a specific file"),
5600 PARSE_OPT_NONEG, NULL, 0, diff_opt_output },
5601
5602 OPT_END()
5603 };
5604
5605 ALLOC_ARRAY(options->parseopts, ARRAY_SIZE(parseopts));
5606 memcpy(options->parseopts, parseopts, sizeof(parseopts));
5607 }
5608
5609 int diff_opt_parse(struct diff_options *options,
5610 const char **av, int ac, const char *prefix)
5611 {
5612 if (!prefix)
5613 prefix = "";
5614
5615 ac = parse_options(ac, av, prefix, options->parseopts, NULL,
5616 PARSE_OPT_KEEP_DASHDASH |
5617 PARSE_OPT_KEEP_UNKNOWN |
5618 PARSE_OPT_NO_INTERNAL_HELP |
5619 PARSE_OPT_ONE_SHOT |
5620 PARSE_OPT_STOP_AT_NON_OPTION);
5621
5622 return ac;
5623 }
5624
5625 int parse_rename_score(const char **cp_p)
5626 {
5627 unsigned long num, scale;
5628 int ch, dot;
5629 const char *cp = *cp_p;
5630
5631 num = 0;
5632 scale = 1;
5633 dot = 0;
5634 for (;;) {
5635 ch = *cp;
5636 if ( !dot && ch == '.' ) {
5637 scale = 1;
5638 dot = 1;
5639 } else if ( ch == '%' ) {
5640 scale = dot ? scale*100 : 100;
5641 cp++; /* % is always at the end */
5642 break;
5643 } else if ( ch >= '0' && ch <= '9' ) {
5644 if ( scale < 100000 ) {
5645 scale *= 10;
5646 num = (num*10) + (ch-'0');
5647 }
5648 } else {
5649 break;
5650 }
5651 cp++;
5652 }
5653 *cp_p = cp;
5654
5655 /* user says num divided by scale and we say internally that
5656 * is MAX_SCORE * num / scale.
5657 */
5658 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5659 }
5660
5661 struct diff_queue_struct diff_queued_diff;
5662
5663 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5664 {
5665 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5666 queue->queue[queue->nr++] = dp;
5667 }
5668
5669 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5670 struct diff_filespec *one,
5671 struct diff_filespec *two)
5672 {
5673 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5674 dp->one = one;
5675 dp->two = two;
5676 if (queue)
5677 diff_q(queue, dp);
5678 return dp;
5679 }
5680
5681 void diff_free_filepair(struct diff_filepair *p)
5682 {
5683 free_filespec(p->one);
5684 free_filespec(p->two);
5685 free(p);
5686 }
5687
5688 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5689 {
5690 int abblen;
5691 const char *abbrev;
5692
5693 /* Do we want all 40 hex characters? */
5694 if (len == the_hash_algo->hexsz)
5695 return oid_to_hex(oid);
5696
5697 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5698 abbrev = diff_abbrev_oid(oid, len);
5699
5700 if (!print_sha1_ellipsis())
5701 return abbrev;
5702
5703 abblen = strlen(abbrev);
5704
5705 /*
5706 * In well-behaved cases, where the abbreviated result is the
5707 * same as the requested length, append three dots after the
5708 * abbreviation (hence the whole logic is limited to the case
5709 * where abblen < 37); when the actual abbreviated result is a
5710 * bit longer than the requested length, we reduce the number
5711 * of dots so that they match the well-behaved ones. However,
5712 * if the actual abbreviation is longer than the requested
5713 * length by more than three, we give up on aligning, and add
5714 * three dots anyway, to indicate that the output is not the
5715 * full object name. Yes, this may be suboptimal, but this
5716 * appears only in "diff --raw --abbrev" output and it is not
5717 * worth the effort to change it now. Note that this would
5718 * likely to work fine when the automatic sizing of default
5719 * abbreviation length is used--we would be fed -1 in "len" in
5720 * that case, and will end up always appending three-dots, but
5721 * the automatic sizing is supposed to give abblen that ensures
5722 * uniqueness across all objects (statistically speaking).
5723 */
5724 if (abblen < the_hash_algo->hexsz - 3) {
5725 static char hex[GIT_MAX_HEXSZ + 1];
5726 if (len < abblen && abblen <= len + 2)
5727 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5728 else
5729 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5730 return hex;
5731 }
5732
5733 return oid_to_hex(oid);
5734 }
5735
5736 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5737 {
5738 int line_termination = opt->line_termination;
5739 int inter_name_termination = line_termination ? '\t' : '\0';
5740
5741 fprintf(opt->file, "%s", diff_line_prefix(opt));
5742 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5743 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5744 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5745 fprintf(opt->file, "%s ",
5746 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5747 }
5748 if (p->score) {
5749 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5750 inter_name_termination);
5751 } else {
5752 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5753 }
5754
5755 if (p->status == DIFF_STATUS_COPIED ||
5756 p->status == DIFF_STATUS_RENAMED) {
5757 const char *name_a, *name_b;
5758 name_a = p->one->path;
5759 name_b = p->two->path;
5760 strip_prefix(opt->prefix_length, &name_a, &name_b);
5761 write_name_quoted(name_a, opt->file, inter_name_termination);
5762 write_name_quoted(name_b, opt->file, line_termination);
5763 } else {
5764 const char *name_a, *name_b;
5765 name_a = p->one->mode ? p->one->path : p->two->path;
5766 name_b = NULL;
5767 strip_prefix(opt->prefix_length, &name_a, &name_b);
5768 write_name_quoted(name_a, opt->file, line_termination);
5769 }
5770 }
5771
5772 int diff_unmodified_pair(struct diff_filepair *p)
5773 {
5774 /* This function is written stricter than necessary to support
5775 * the currently implemented transformers, but the idea is to
5776 * let transformers to produce diff_filepairs any way they want,
5777 * and filter and clean them up here before producing the output.
5778 */
5779 struct diff_filespec *one = p->one, *two = p->two;
5780
5781 if (DIFF_PAIR_UNMERGED(p))
5782 return 0; /* unmerged is interesting */
5783
5784 /* deletion, addition, mode or type change
5785 * and rename are all interesting.
5786 */
5787 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5788 DIFF_PAIR_MODE_CHANGED(p) ||
5789 strcmp(one->path, two->path))
5790 return 0;
5791
5792 /* both are valid and point at the same path. that is, we are
5793 * dealing with a change.
5794 */
5795 if (one->oid_valid && two->oid_valid &&
5796 oideq(&one->oid, &two->oid) &&
5797 !one->dirty_submodule && !two->dirty_submodule)
5798 return 1; /* no change */
5799 if (!one->oid_valid && !two->oid_valid)
5800 return 1; /* both look at the same file on the filesystem. */
5801 return 0;
5802 }
5803
5804 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5805 {
5806 if (diff_unmodified_pair(p))
5807 return;
5808
5809 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5810 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5811 return; /* no tree diffs in patch format */
5812
5813 run_diff(p, o);
5814 }
5815
5816 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5817 struct diffstat_t *diffstat)
5818 {
5819 if (diff_unmodified_pair(p))
5820 return;
5821
5822 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5823 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5824 return; /* no useful stat for tree diffs */
5825
5826 run_diffstat(p, o, diffstat);
5827 }
5828
5829 static void diff_flush_checkdiff(struct diff_filepair *p,
5830 struct diff_options *o)
5831 {
5832 if (diff_unmodified_pair(p))
5833 return;
5834
5835 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5836 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5837 return; /* nothing to check in tree diffs */
5838
5839 run_checkdiff(p, o);
5840 }
5841
5842 int diff_queue_is_empty(void)
5843 {
5844 struct diff_queue_struct *q = &diff_queued_diff;
5845 int i;
5846 for (i = 0; i < q->nr; i++)
5847 if (!diff_unmodified_pair(q->queue[i]))
5848 return 0;
5849 return 1;
5850 }
5851
5852 #if DIFF_DEBUG
5853 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5854 {
5855 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5856 x, one ? one : "",
5857 s->path,
5858 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5859 s->mode,
5860 s->oid_valid ? oid_to_hex(&s->oid) : "");
5861 fprintf(stderr, "queue[%d] %s size %lu\n",
5862 x, one ? one : "",
5863 s->size);
5864 }
5865
5866 void diff_debug_filepair(const struct diff_filepair *p, int i)
5867 {
5868 diff_debug_filespec(p->one, i, "one");
5869 diff_debug_filespec(p->two, i, "two");
5870 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5871 p->score, p->status ? p->status : '?',
5872 p->one->rename_used, p->broken_pair);
5873 }
5874
5875 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5876 {
5877 int i;
5878 if (msg)
5879 fprintf(stderr, "%s\n", msg);
5880 fprintf(stderr, "q->nr = %d\n", q->nr);
5881 for (i = 0; i < q->nr; i++) {
5882 struct diff_filepair *p = q->queue[i];
5883 diff_debug_filepair(p, i);
5884 }
5885 }
5886 #endif
5887
5888 static void diff_resolve_rename_copy(void)
5889 {
5890 int i;
5891 struct diff_filepair *p;
5892 struct diff_queue_struct *q = &diff_queued_diff;
5893
5894 diff_debug_queue("resolve-rename-copy", q);
5895
5896 for (i = 0; i < q->nr; i++) {
5897 p = q->queue[i];
5898 p->status = 0; /* undecided */
5899 if (DIFF_PAIR_UNMERGED(p))
5900 p->status = DIFF_STATUS_UNMERGED;
5901 else if (!DIFF_FILE_VALID(p->one))
5902 p->status = DIFF_STATUS_ADDED;
5903 else if (!DIFF_FILE_VALID(p->two))
5904 p->status = DIFF_STATUS_DELETED;
5905 else if (DIFF_PAIR_TYPE_CHANGED(p))
5906 p->status = DIFF_STATUS_TYPE_CHANGED;
5907
5908 /* from this point on, we are dealing with a pair
5909 * whose both sides are valid and of the same type, i.e.
5910 * either in-place edit or rename/copy edit.
5911 */
5912 else if (DIFF_PAIR_RENAME(p)) {
5913 /*
5914 * A rename might have re-connected a broken
5915 * pair up, causing the pathnames to be the
5916 * same again. If so, that's not a rename at
5917 * all, just a modification..
5918 *
5919 * Otherwise, see if this source was used for
5920 * multiple renames, in which case we decrement
5921 * the count, and call it a copy.
5922 */
5923 if (!strcmp(p->one->path, p->two->path))
5924 p->status = DIFF_STATUS_MODIFIED;
5925 else if (--p->one->rename_used > 0)
5926 p->status = DIFF_STATUS_COPIED;
5927 else
5928 p->status = DIFF_STATUS_RENAMED;
5929 }
5930 else if (!oideq(&p->one->oid, &p->two->oid) ||
5931 p->one->mode != p->two->mode ||
5932 p->one->dirty_submodule ||
5933 p->two->dirty_submodule ||
5934 is_null_oid(&p->one->oid))
5935 p->status = DIFF_STATUS_MODIFIED;
5936 else {
5937 /* This is a "no-change" entry and should not
5938 * happen anymore, but prepare for broken callers.
5939 */
5940 error("feeding unmodified %s to diffcore",
5941 p->one->path);
5942 p->status = DIFF_STATUS_UNKNOWN;
5943 }
5944 }
5945 diff_debug_queue("resolve-rename-copy done", q);
5946 }
5947
5948 static int check_pair_status(struct diff_filepair *p)
5949 {
5950 switch (p->status) {
5951 case DIFF_STATUS_UNKNOWN:
5952 return 0;
5953 case 0:
5954 die("internal error in diff-resolve-rename-copy");
5955 default:
5956 return 1;
5957 }
5958 }
5959
5960 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5961 {
5962 int fmt = opt->output_format;
5963
5964 if (fmt & DIFF_FORMAT_CHECKDIFF)
5965 diff_flush_checkdiff(p, opt);
5966 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5967 diff_flush_raw(p, opt);
5968 else if (fmt & DIFF_FORMAT_NAME) {
5969 const char *name_a, *name_b;
5970 name_a = p->two->path;
5971 name_b = NULL;
5972 strip_prefix(opt->prefix_length, &name_a, &name_b);
5973 fprintf(opt->file, "%s", diff_line_prefix(opt));
5974 write_name_quoted(name_a, opt->file, opt->line_termination);
5975 }
5976 }
5977
5978 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5979 {
5980 struct strbuf sb = STRBUF_INIT;
5981 if (fs->mode)
5982 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5983 else
5984 strbuf_addf(&sb, " %s ", newdelete);
5985
5986 quote_c_style(fs->path, &sb, NULL, 0);
5987 strbuf_addch(&sb, '\n');
5988 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5989 sb.buf, sb.len, 0);
5990 strbuf_release(&sb);
5991 }
5992
5993 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5994 int show_name)
5995 {
5996 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5997 struct strbuf sb = STRBUF_INIT;
5998 strbuf_addf(&sb, " mode change %06o => %06o",
5999 p->one->mode, p->two->mode);
6000 if (show_name) {
6001 strbuf_addch(&sb, ' ');
6002 quote_c_style(p->two->path, &sb, NULL, 0);
6003 }
6004 strbuf_addch(&sb, '\n');
6005 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6006 sb.buf, sb.len, 0);
6007 strbuf_release(&sb);
6008 }
6009 }
6010
6011 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
6012 struct diff_filepair *p)
6013 {
6014 struct strbuf sb = STRBUF_INIT;
6015 struct strbuf names = STRBUF_INIT;
6016
6017 pprint_rename(&names, p->one->path, p->two->path);
6018 strbuf_addf(&sb, " %s %s (%d%%)\n",
6019 renamecopy, names.buf, similarity_index(p));
6020 strbuf_release(&names);
6021 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6022 sb.buf, sb.len, 0);
6023 show_mode_change(opt, p, 0);
6024 strbuf_release(&sb);
6025 }
6026
6027 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
6028 {
6029 switch(p->status) {
6030 case DIFF_STATUS_DELETED:
6031 show_file_mode_name(opt, "delete", p->one);
6032 break;
6033 case DIFF_STATUS_ADDED:
6034 show_file_mode_name(opt, "create", p->two);
6035 break;
6036 case DIFF_STATUS_COPIED:
6037 show_rename_copy(opt, "copy", p);
6038 break;
6039 case DIFF_STATUS_RENAMED:
6040 show_rename_copy(opt, "rename", p);
6041 break;
6042 default:
6043 if (p->score) {
6044 struct strbuf sb = STRBUF_INIT;
6045 strbuf_addstr(&sb, " rewrite ");
6046 quote_c_style(p->two->path, &sb, NULL, 0);
6047 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
6048 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
6049 sb.buf, sb.len, 0);
6050 strbuf_release(&sb);
6051 }
6052 show_mode_change(opt, p, !p->score);
6053 break;
6054 }
6055 }
6056
6057 struct patch_id_t {
6058 git_hash_ctx *ctx;
6059 int patchlen;
6060 };
6061
6062 static int remove_space(char *line, int len)
6063 {
6064 int i;
6065 char *dst = line;
6066 unsigned char c;
6067
6068 for (i = 0; i < len; i++)
6069 if (!isspace((c = line[i])))
6070 *dst++ = c;
6071
6072 return dst - line;
6073 }
6074
6075 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx)
6076 {
6077 unsigned char hash[GIT_MAX_RAWSZ];
6078 unsigned short carry = 0;
6079 int i;
6080
6081 the_hash_algo->final_fn(hash, ctx);
6082 the_hash_algo->init_fn(ctx);
6083 /* 20-byte sum, with carry */
6084 for (i = 0; i < the_hash_algo->rawsz; ++i) {
6085 carry += result->hash[i] + hash[i];
6086 result->hash[i] = carry;
6087 carry >>= 8;
6088 }
6089 }
6090
6091 static int patch_id_consume(void *priv, char *line, unsigned long len)
6092 {
6093 struct patch_id_t *data = priv;
6094 int new_len;
6095
6096 if (len > 12 && starts_with(line, "\\ "))
6097 return 0;
6098 new_len = remove_space(line, len);
6099
6100 the_hash_algo->update_fn(data->ctx, line, new_len);
6101 data->patchlen += new_len;
6102 return 0;
6103 }
6104
6105 static void patch_id_add_string(git_hash_ctx *ctx, const char *str)
6106 {
6107 the_hash_algo->update_fn(ctx, str, strlen(str));
6108 }
6109
6110 static void patch_id_add_mode(git_hash_ctx *ctx, unsigned mode)
6111 {
6112 /* large enough for 2^32 in octal */
6113 char buf[12];
6114 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
6115 the_hash_algo->update_fn(ctx, buf, len);
6116 }
6117
6118 /* returns 0 upon success, and writes result into oid */
6119 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6120 {
6121 struct diff_queue_struct *q = &diff_queued_diff;
6122 int i;
6123 git_hash_ctx ctx;
6124 struct patch_id_t data;
6125
6126 the_hash_algo->init_fn(&ctx);
6127 memset(&data, 0, sizeof(struct patch_id_t));
6128 data.ctx = &ctx;
6129 oidclr(oid);
6130
6131 for (i = 0; i < q->nr; i++) {
6132 xpparam_t xpp;
6133 xdemitconf_t xecfg;
6134 mmfile_t mf1, mf2;
6135 struct diff_filepair *p = q->queue[i];
6136 int len1, len2;
6137
6138 memset(&xpp, 0, sizeof(xpp));
6139 memset(&xecfg, 0, sizeof(xecfg));
6140 if (p->status == 0)
6141 return error("internal diff status error");
6142 if (p->status == DIFF_STATUS_UNKNOWN)
6143 continue;
6144 if (diff_unmodified_pair(p))
6145 continue;
6146 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
6147 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
6148 continue;
6149 if (DIFF_PAIR_UNMERGED(p))
6150 continue;
6151
6152 diff_fill_oid_info(p->one, options->repo->index);
6153 diff_fill_oid_info(p->two, options->repo->index);
6154
6155 len1 = remove_space(p->one->path, strlen(p->one->path));
6156 len2 = remove_space(p->two->path, strlen(p->two->path));
6157 patch_id_add_string(&ctx, "diff--git");
6158 patch_id_add_string(&ctx, "a/");
6159 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6160 patch_id_add_string(&ctx, "b/");
6161 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6162
6163 if (p->one->mode == 0) {
6164 patch_id_add_string(&ctx, "newfilemode");
6165 patch_id_add_mode(&ctx, p->two->mode);
6166 patch_id_add_string(&ctx, "---/dev/null");
6167 patch_id_add_string(&ctx, "+++b/");
6168 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6169 } else if (p->two->mode == 0) {
6170 patch_id_add_string(&ctx, "deletedfilemode");
6171 patch_id_add_mode(&ctx, p->one->mode);
6172 patch_id_add_string(&ctx, "---a/");
6173 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6174 patch_id_add_string(&ctx, "+++/dev/null");
6175 } else {
6176 patch_id_add_string(&ctx, "---a/");
6177 the_hash_algo->update_fn(&ctx, p->one->path, len1);
6178 patch_id_add_string(&ctx, "+++b/");
6179 the_hash_algo->update_fn(&ctx, p->two->path, len2);
6180 }
6181
6182 if (diff_header_only)
6183 continue;
6184
6185 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
6186 fill_mmfile(options->repo, &mf2, p->two) < 0)
6187 return error("unable to read files to diff");
6188
6189 if (diff_filespec_is_binary(options->repo, p->one) ||
6190 diff_filespec_is_binary(options->repo, p->two)) {
6191 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->one->oid),
6192 the_hash_algo->hexsz);
6193 the_hash_algo->update_fn(&ctx, oid_to_hex(&p->two->oid),
6194 the_hash_algo->hexsz);
6195 continue;
6196 }
6197
6198 xpp.flags = 0;
6199 xecfg.ctxlen = 3;
6200 xecfg.flags = XDL_EMIT_NO_HUNK_HDR;
6201 if (xdi_diff_outf(&mf1, &mf2, NULL,
6202 patch_id_consume, &data, &xpp, &xecfg))
6203 return error("unable to generate patch-id diff for %s",
6204 p->one->path);
6205
6206 if (stable)
6207 flush_one_hunk(oid, &ctx);
6208 }
6209
6210 if (!stable)
6211 the_hash_algo->final_oid_fn(oid, &ctx);
6212
6213 return 0;
6214 }
6215
6216 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only, int stable)
6217 {
6218 struct diff_queue_struct *q = &diff_queued_diff;
6219 int i;
6220 int result = diff_get_patch_id(options, oid, diff_header_only, stable);
6221
6222 for (i = 0; i < q->nr; i++)
6223 diff_free_filepair(q->queue[i]);
6224
6225 free(q->queue);
6226 DIFF_QUEUE_CLEAR(q);
6227
6228 return result;
6229 }
6230
6231 static int is_summary_empty(const struct diff_queue_struct *q)
6232 {
6233 int i;
6234
6235 for (i = 0; i < q->nr; i++) {
6236 const struct diff_filepair *p = q->queue[i];
6237
6238 switch (p->status) {
6239 case DIFF_STATUS_DELETED:
6240 case DIFF_STATUS_ADDED:
6241 case DIFF_STATUS_COPIED:
6242 case DIFF_STATUS_RENAMED:
6243 return 0;
6244 default:
6245 if (p->score)
6246 return 0;
6247 if (p->one->mode && p->two->mode &&
6248 p->one->mode != p->two->mode)
6249 return 0;
6250 break;
6251 }
6252 }
6253 return 1;
6254 }
6255
6256 static const char rename_limit_warning[] =
6257 N_("exhaustive rename detection was skipped due to too many files.");
6258
6259 static const char degrade_cc_to_c_warning[] =
6260 N_("only found copies from modified paths due to too many files.");
6261
6262 static const char rename_limit_advice[] =
6263 N_("you may want to set your %s variable to at least "
6264 "%d and retry the command.");
6265
6266 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
6267 {
6268 fflush(stdout);
6269 if (degraded_cc)
6270 warning(_(degrade_cc_to_c_warning));
6271 else if (needed)
6272 warning(_(rename_limit_warning));
6273 else
6274 return;
6275 if (0 < needed)
6276 warning(_(rename_limit_advice), varname, needed);
6277 }
6278
6279 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
6280 {
6281 int i;
6282 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
6283 struct diff_queue_struct *q = &diff_queued_diff;
6284
6285 if (WSEH_NEW & WS_RULE_MASK)
6286 BUG("WS rules bit mask overlaps with diff symbol flags");
6287
6288 if (o->color_moved)
6289 o->emitted_symbols = &esm;
6290
6291 for (i = 0; i < q->nr; i++) {
6292 struct diff_filepair *p = q->queue[i];
6293 if (check_pair_status(p))
6294 diff_flush_patch(p, o);
6295 }
6296
6297 if (o->emitted_symbols) {
6298 if (o->color_moved) {
6299 struct mem_pool entry_pool;
6300 struct moved_entry_list *entry_list;
6301
6302 mem_pool_init(&entry_pool, 1024 * 1024);
6303 entry_list = add_lines_to_move_detection(o,
6304 &entry_pool);
6305 mark_color_as_moved(o, entry_list);
6306 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
6307 dim_moved_lines(o);
6308
6309 mem_pool_discard(&entry_pool, 0);
6310 free(entry_list);
6311 }
6312
6313 for (i = 0; i < esm.nr; i++)
6314 emit_diff_symbol_from_struct(o, &esm.buf[i]);
6315
6316 for (i = 0; i < esm.nr; i++)
6317 free((void *)esm.buf[i].line);
6318 esm.nr = 0;
6319
6320 o->emitted_symbols = NULL;
6321 }
6322 }
6323
6324 static void diff_free_file(struct diff_options *options)
6325 {
6326 if (options->close_file)
6327 fclose(options->file);
6328 }
6329
6330 static void diff_free_ignore_regex(struct diff_options *options)
6331 {
6332 int i;
6333
6334 for (i = 0; i < options->ignore_regex_nr; i++) {
6335 regfree(options->ignore_regex[i]);
6336 free(options->ignore_regex[i]);
6337 }
6338 free(options->ignore_regex);
6339 }
6340
6341 void diff_free(struct diff_options *options)
6342 {
6343 if (options->no_free)
6344 return;
6345
6346 diff_free_file(options);
6347 diff_free_ignore_regex(options);
6348 }
6349
6350 void diff_flush(struct diff_options *options)
6351 {
6352 struct diff_queue_struct *q = &diff_queued_diff;
6353 int i, output_format = options->output_format;
6354 int separator = 0;
6355 int dirstat_by_line = 0;
6356
6357 /*
6358 * Order: raw, stat, summary, patch
6359 * or: name/name-status/checkdiff (other bits clear)
6360 */
6361 if (!q->nr)
6362 goto free_queue;
6363
6364 if (output_format & (DIFF_FORMAT_RAW |
6365 DIFF_FORMAT_NAME |
6366 DIFF_FORMAT_NAME_STATUS |
6367 DIFF_FORMAT_CHECKDIFF)) {
6368 for (i = 0; i < q->nr; i++) {
6369 struct diff_filepair *p = q->queue[i];
6370 if (check_pair_status(p))
6371 flush_one_pair(p, options);
6372 }
6373 separator++;
6374 }
6375
6376 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
6377 dirstat_by_line = 1;
6378
6379 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
6380 dirstat_by_line) {
6381 struct diffstat_t diffstat;
6382
6383 compute_diffstat(options, &diffstat, q);
6384 if (output_format & DIFF_FORMAT_NUMSTAT)
6385 show_numstat(&diffstat, options);
6386 if (output_format & DIFF_FORMAT_DIFFSTAT)
6387 show_stats(&diffstat, options);
6388 if (output_format & DIFF_FORMAT_SHORTSTAT)
6389 show_shortstats(&diffstat, options);
6390 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
6391 show_dirstat_by_line(&diffstat, options);
6392 free_diffstat_info(&diffstat);
6393 separator++;
6394 }
6395 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
6396 show_dirstat(options);
6397
6398 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
6399 for (i = 0; i < q->nr; i++) {
6400 diff_summary(options, q->queue[i]);
6401 }
6402 separator++;
6403 }
6404
6405 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
6406 options->flags.exit_with_status &&
6407 options->flags.diff_from_contents) {
6408 /*
6409 * run diff_flush_patch for the exit status. setting
6410 * options->file to /dev/null should be safe, because we
6411 * aren't supposed to produce any output anyway.
6412 */
6413 diff_free_file(options);
6414 options->file = xfopen("/dev/null", "w");
6415 options->close_file = 1;
6416 options->color_moved = 0;
6417 for (i = 0; i < q->nr; i++) {
6418 struct diff_filepair *p = q->queue[i];
6419 if (check_pair_status(p))
6420 diff_flush_patch(p, options);
6421 if (options->found_changes)
6422 break;
6423 }
6424 }
6425
6426 if (output_format & DIFF_FORMAT_PATCH) {
6427 if (separator) {
6428 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
6429 if (options->stat_sep)
6430 /* attach patch instead of inline */
6431 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
6432 NULL, 0, 0);
6433 }
6434
6435 diff_flush_patch_all_file_pairs(options);
6436 }
6437
6438 if (output_format & DIFF_FORMAT_CALLBACK)
6439 options->format_callback(q, options, options->format_callback_data);
6440
6441 for (i = 0; i < q->nr; i++)
6442 diff_free_filepair(q->queue[i]);
6443 free_queue:
6444 free(q->queue);
6445 DIFF_QUEUE_CLEAR(q);
6446 diff_free(options);
6447
6448 /*
6449 * Report the content-level differences with HAS_CHANGES;
6450 * diff_addremove/diff_change does not set the bit when
6451 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6452 */
6453 if (options->flags.diff_from_contents) {
6454 if (options->found_changes)
6455 options->flags.has_changes = 1;
6456 else
6457 options->flags.has_changes = 0;
6458 }
6459 }
6460
6461 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6462 {
6463 return (((p->status == DIFF_STATUS_MODIFIED) &&
6464 ((p->score &&
6465 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6466 (!p->score &&
6467 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6468 ((p->status != DIFF_STATUS_MODIFIED) &&
6469 filter_bit_tst(p->status, options)));
6470 }
6471
6472 static void diffcore_apply_filter(struct diff_options *options)
6473 {
6474 int i;
6475 struct diff_queue_struct *q = &diff_queued_diff;
6476 struct diff_queue_struct outq;
6477
6478 DIFF_QUEUE_CLEAR(&outq);
6479
6480 if (!options->filter)
6481 return;
6482
6483 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6484 int found;
6485 for (i = found = 0; !found && i < q->nr; i++) {
6486 if (match_filter(options, q->queue[i]))
6487 found++;
6488 }
6489 if (found)
6490 return;
6491
6492 /* otherwise we will clear the whole queue
6493 * by copying the empty outq at the end of this
6494 * function, but first clear the current entries
6495 * in the queue.
6496 */
6497 for (i = 0; i < q->nr; i++)
6498 diff_free_filepair(q->queue[i]);
6499 }
6500 else {
6501 /* Only the matching ones */
6502 for (i = 0; i < q->nr; i++) {
6503 struct diff_filepair *p = q->queue[i];
6504 if (match_filter(options, p))
6505 diff_q(&outq, p);
6506 else
6507 diff_free_filepair(p);
6508 }
6509 }
6510 free(q->queue);
6511 *q = outq;
6512 }
6513
6514 /* Check whether two filespecs with the same mode and size are identical */
6515 static int diff_filespec_is_identical(struct repository *r,
6516 struct diff_filespec *one,
6517 struct diff_filespec *two)
6518 {
6519 if (S_ISGITLINK(one->mode))
6520 return 0;
6521 if (diff_populate_filespec(r, one, NULL))
6522 return 0;
6523 if (diff_populate_filespec(r, two, NULL))
6524 return 0;
6525 return !memcmp(one->data, two->data, one->size);
6526 }
6527
6528 static int diff_filespec_check_stat_unmatch(struct repository *r,
6529 struct diff_filepair *p)
6530 {
6531 struct diff_populate_filespec_options dpf_options = {
6532 .check_size_only = 1,
6533 .missing_object_cb = diff_queued_diff_prefetch,
6534 .missing_object_data = r,
6535 };
6536
6537 if (p->done_skip_stat_unmatch)
6538 return p->skip_stat_unmatch_result;
6539
6540 p->done_skip_stat_unmatch = 1;
6541 p->skip_stat_unmatch_result = 0;
6542 /*
6543 * 1. Entries that come from stat info dirtiness
6544 * always have both sides (iow, not create/delete),
6545 * one side of the object name is unknown, with
6546 * the same mode and size. Keep the ones that
6547 * do not match these criteria. They have real
6548 * differences.
6549 *
6550 * 2. At this point, the file is known to be modified,
6551 * with the same mode and size, and the object
6552 * name of one side is unknown. Need to inspect
6553 * the identical contents.
6554 */
6555 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6556 !DIFF_FILE_VALID(p->two) ||
6557 (p->one->oid_valid && p->two->oid_valid) ||
6558 (p->one->mode != p->two->mode) ||
6559 diff_populate_filespec(r, p->one, &dpf_options) ||
6560 diff_populate_filespec(r, p->two, &dpf_options) ||
6561 (p->one->size != p->two->size) ||
6562 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6563 p->skip_stat_unmatch_result = 1;
6564 return p->skip_stat_unmatch_result;
6565 }
6566
6567 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6568 {
6569 int i;
6570 struct diff_queue_struct *q = &diff_queued_diff;
6571 struct diff_queue_struct outq;
6572 DIFF_QUEUE_CLEAR(&outq);
6573
6574 for (i = 0; i < q->nr; i++) {
6575 struct diff_filepair *p = q->queue[i];
6576
6577 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6578 diff_q(&outq, p);
6579 else {
6580 /*
6581 * The caller can subtract 1 from skip_stat_unmatch
6582 * to determine how many paths were dirty only
6583 * due to stat info mismatch.
6584 */
6585 if (!diffopt->flags.no_index)
6586 diffopt->skip_stat_unmatch++;
6587 diff_free_filepair(p);
6588 }
6589 }
6590 free(q->queue);
6591 *q = outq;
6592 }
6593
6594 static int diffnamecmp(const void *a_, const void *b_)
6595 {
6596 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6597 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6598 const char *name_a, *name_b;
6599
6600 name_a = a->one ? a->one->path : a->two->path;
6601 name_b = b->one ? b->one->path : b->two->path;
6602 return strcmp(name_a, name_b);
6603 }
6604
6605 void diffcore_fix_diff_index(void)
6606 {
6607 struct diff_queue_struct *q = &diff_queued_diff;
6608 QSORT(q->queue, q->nr, diffnamecmp);
6609 }
6610
6611 void diff_add_if_missing(struct repository *r,
6612 struct oid_array *to_fetch,
6613 const struct diff_filespec *filespec)
6614 {
6615 if (filespec && filespec->oid_valid &&
6616 !S_ISGITLINK(filespec->mode) &&
6617 oid_object_info_extended(r, &filespec->oid, NULL,
6618 OBJECT_INFO_FOR_PREFETCH))
6619 oid_array_append(to_fetch, &filespec->oid);
6620 }
6621
6622 void diff_queued_diff_prefetch(void *repository)
6623 {
6624 struct repository *repo = repository;
6625 int i;
6626 struct diff_queue_struct *q = &diff_queued_diff;
6627 struct oid_array to_fetch = OID_ARRAY_INIT;
6628
6629 for (i = 0; i < q->nr; i++) {
6630 struct diff_filepair *p = q->queue[i];
6631 diff_add_if_missing(repo, &to_fetch, p->one);
6632 diff_add_if_missing(repo, &to_fetch, p->two);
6633 }
6634
6635 /*
6636 * NEEDSWORK: Consider deduplicating the OIDs sent.
6637 */
6638 promisor_remote_get_direct(repo, to_fetch.oid, to_fetch.nr);
6639
6640 oid_array_clear(&to_fetch);
6641 }
6642
6643 void diffcore_std(struct diff_options *options)
6644 {
6645 int output_formats_to_prefetch = DIFF_FORMAT_DIFFSTAT |
6646 DIFF_FORMAT_NUMSTAT |
6647 DIFF_FORMAT_PATCH |
6648 DIFF_FORMAT_SHORTSTAT |
6649 DIFF_FORMAT_DIRSTAT;
6650
6651 /*
6652 * Check if the user requested a blob-data-requiring diff output and/or
6653 * break-rewrite detection (which requires blob data). If yes, prefetch
6654 * the diff pairs.
6655 *
6656 * If no prefetching occurs, diffcore_rename() will prefetch if it
6657 * decides that it needs inexact rename detection.
6658 */
6659 if (options->repo == the_repository && has_promisor_remote() &&
6660 (options->output_format & output_formats_to_prefetch ||
6661 options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
6662 diff_queued_diff_prefetch(options->repo);
6663
6664 /* NOTE please keep the following in sync with diff_tree_combined() */
6665 if (options->skip_stat_unmatch)
6666 diffcore_skip_stat_unmatch(options);
6667 if (!options->found_follow) {
6668 /* See try_to_follow_renames() in tree-diff.c */
6669 if (options->break_opt != -1)
6670 diffcore_break(options->repo,
6671 options->break_opt);
6672 if (options->detect_rename)
6673 diffcore_rename(options);
6674 if (options->break_opt != -1)
6675 diffcore_merge_broken();
6676 }
6677 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6678 diffcore_pickaxe(options);
6679 if (options->orderfile)
6680 diffcore_order(options->orderfile);
6681 if (options->rotate_to)
6682 diffcore_rotate(options);
6683 if (!options->found_follow)
6684 /* See try_to_follow_renames() in tree-diff.c */
6685 diff_resolve_rename_copy();
6686 diffcore_apply_filter(options);
6687
6688 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6689 options->flags.has_changes = 1;
6690 else
6691 options->flags.has_changes = 0;
6692
6693 options->found_follow = 0;
6694 }
6695
6696 int diff_result_code(struct diff_options *opt, int status)
6697 {
6698 int result = 0;
6699
6700 diff_warn_rename_limit("diff.renameLimit",
6701 opt->needed_rename_limit,
6702 opt->degraded_cc_to_c);
6703 if (!opt->flags.exit_with_status &&
6704 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6705 return status;
6706 if (opt->flags.exit_with_status &&
6707 opt->flags.has_changes)
6708 result |= 01;
6709 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6710 opt->flags.check_failed)
6711 result |= 02;
6712 return result;
6713 }
6714
6715 int diff_can_quit_early(struct diff_options *opt)
6716 {
6717 return (opt->flags.quick &&
6718 !opt->filter &&
6719 opt->flags.has_changes);
6720 }
6721
6722 /*
6723 * Shall changes to this submodule be ignored?
6724 *
6725 * Submodule changes can be configured to be ignored separately for each path,
6726 * but that configuration can be overridden from the command line.
6727 */
6728 static int is_submodule_ignored(const char *path, struct diff_options *options)
6729 {
6730 int ignored = 0;
6731 struct diff_flags orig_flags = options->flags;
6732 if (!options->flags.override_submodule_config)
6733 set_diffopt_flags_from_submodule_config(options, path);
6734 if (options->flags.ignore_submodules)
6735 ignored = 1;
6736 options->flags = orig_flags;
6737 return ignored;
6738 }
6739
6740 void compute_diffstat(struct diff_options *options,
6741 struct diffstat_t *diffstat,
6742 struct diff_queue_struct *q)
6743 {
6744 int i;
6745
6746 memset(diffstat, 0, sizeof(struct diffstat_t));
6747 for (i = 0; i < q->nr; i++) {
6748 struct diff_filepair *p = q->queue[i];
6749 if (check_pair_status(p))
6750 diff_flush_stat(p, options, diffstat);
6751 }
6752 }
6753
6754 void diff_addremove(struct diff_options *options,
6755 int addremove, unsigned mode,
6756 const struct object_id *oid,
6757 int oid_valid,
6758 const char *concatpath, unsigned dirty_submodule)
6759 {
6760 struct diff_filespec *one, *two;
6761
6762 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6763 return;
6764
6765 /* This may look odd, but it is a preparation for
6766 * feeding "there are unchanged files which should
6767 * not produce diffs, but when you are doing copy
6768 * detection you would need them, so here they are"
6769 * entries to the diff-core. They will be prefixed
6770 * with something like '=' or '*' (I haven't decided
6771 * which but should not make any difference).
6772 * Feeding the same new and old to diff_change()
6773 * also has the same effect.
6774 * Before the final output happens, they are pruned after
6775 * merged into rename/copy pairs as appropriate.
6776 */
6777 if (options->flags.reverse_diff)
6778 addremove = (addremove == '+' ? '-' :
6779 addremove == '-' ? '+' : addremove);
6780
6781 if (options->prefix &&
6782 strncmp(concatpath, options->prefix, options->prefix_length))
6783 return;
6784
6785 one = alloc_filespec(concatpath);
6786 two = alloc_filespec(concatpath);
6787
6788 if (addremove != '+')
6789 fill_filespec(one, oid, oid_valid, mode);
6790 if (addremove != '-') {
6791 fill_filespec(two, oid, oid_valid, mode);
6792 two->dirty_submodule = dirty_submodule;
6793 }
6794
6795 diff_queue(&diff_queued_diff, one, two);
6796 if (!options->flags.diff_from_contents)
6797 options->flags.has_changes = 1;
6798 }
6799
6800 void diff_change(struct diff_options *options,
6801 unsigned old_mode, unsigned new_mode,
6802 const struct object_id *old_oid,
6803 const struct object_id *new_oid,
6804 int old_oid_valid, int new_oid_valid,
6805 const char *concatpath,
6806 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6807 {
6808 struct diff_filespec *one, *two;
6809 struct diff_filepair *p;
6810
6811 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6812 is_submodule_ignored(concatpath, options))
6813 return;
6814
6815 if (options->flags.reverse_diff) {
6816 SWAP(old_mode, new_mode);
6817 SWAP(old_oid, new_oid);
6818 SWAP(old_oid_valid, new_oid_valid);
6819 SWAP(old_dirty_submodule, new_dirty_submodule);
6820 }
6821
6822 if (options->prefix &&
6823 strncmp(concatpath, options->prefix, options->prefix_length))
6824 return;
6825
6826 one = alloc_filespec(concatpath);
6827 two = alloc_filespec(concatpath);
6828 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6829 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6830 one->dirty_submodule = old_dirty_submodule;
6831 two->dirty_submodule = new_dirty_submodule;
6832 p = diff_queue(&diff_queued_diff, one, two);
6833
6834 if (options->flags.diff_from_contents)
6835 return;
6836
6837 if (options->flags.quick && options->skip_stat_unmatch &&
6838 !diff_filespec_check_stat_unmatch(options->repo, p)) {
6839 diff_free_filespec_data(p->one);
6840 diff_free_filespec_data(p->two);
6841 return;
6842 }
6843
6844 options->flags.has_changes = 1;
6845 }
6846
6847 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6848 {
6849 struct diff_filepair *pair;
6850 struct diff_filespec *one, *two;
6851
6852 if (options->prefix &&
6853 strncmp(path, options->prefix, options->prefix_length))
6854 return NULL;
6855
6856 one = alloc_filespec(path);
6857 two = alloc_filespec(path);
6858 pair = diff_queue(&diff_queued_diff, one, two);
6859 pair->is_unmerged = 1;
6860 return pair;
6861 }
6862
6863 static char *run_textconv(struct repository *r,
6864 const char *pgm,
6865 struct diff_filespec *spec,
6866 size_t *outsize)
6867 {
6868 struct diff_tempfile *temp;
6869 struct child_process child = CHILD_PROCESS_INIT;
6870 struct strbuf buf = STRBUF_INIT;
6871 int err = 0;
6872
6873 temp = prepare_temp_file(r, spec->path, spec);
6874 strvec_push(&child.args, pgm);
6875 strvec_push(&child.args, temp->name);
6876
6877 child.use_shell = 1;
6878 child.out = -1;
6879 if (start_command(&child)) {
6880 remove_tempfile();
6881 return NULL;
6882 }
6883
6884 if (strbuf_read(&buf, child.out, 0) < 0)
6885 err = error("error reading from textconv command '%s'", pgm);
6886 close(child.out);
6887
6888 if (finish_command(&child) || err) {
6889 strbuf_release(&buf);
6890 remove_tempfile();
6891 return NULL;
6892 }
6893 remove_tempfile();
6894
6895 return strbuf_detach(&buf, outsize);
6896 }
6897
6898 size_t fill_textconv(struct repository *r,
6899 struct userdiff_driver *driver,
6900 struct diff_filespec *df,
6901 char **outbuf)
6902 {
6903 size_t size;
6904
6905 if (!driver) {
6906 if (!DIFF_FILE_VALID(df)) {
6907 *outbuf = "";
6908 return 0;
6909 }
6910 if (diff_populate_filespec(r, df, NULL))
6911 die("unable to read files to diff");
6912 *outbuf = df->data;
6913 return df->size;
6914 }
6915
6916 if (!driver->textconv)
6917 BUG("fill_textconv called with non-textconv driver");
6918
6919 if (driver->textconv_cache && df->oid_valid) {
6920 *outbuf = notes_cache_get(driver->textconv_cache,
6921 &df->oid,
6922 &size);
6923 if (*outbuf)
6924 return size;
6925 }
6926
6927 *outbuf = run_textconv(r, driver->textconv, df, &size);
6928 if (!*outbuf)
6929 die("unable to read files to diff");
6930
6931 if (driver->textconv_cache && df->oid_valid) {
6932 /* ignore errors, as we might be in a readonly repository */
6933 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6934 size);
6935 /*
6936 * we could save up changes and flush them all at the end,
6937 * but we would need an extra call after all diffing is done.
6938 * Since generating a cache entry is the slow path anyway,
6939 * this extra overhead probably isn't a big deal.
6940 */
6941 notes_cache_write(driver->textconv_cache);
6942 }
6943
6944 return size;
6945 }
6946
6947 int textconv_object(struct repository *r,
6948 const char *path,
6949 unsigned mode,
6950 const struct object_id *oid,
6951 int oid_valid,
6952 char **buf,
6953 unsigned long *buf_size)
6954 {
6955 struct diff_filespec *df;
6956 struct userdiff_driver *textconv;
6957
6958 df = alloc_filespec(path);
6959 fill_filespec(df, oid, oid_valid, mode);
6960 textconv = get_textconv(r, df);
6961 if (!textconv) {
6962 free_filespec(df);
6963 return 0;
6964 }
6965
6966 *buf_size = fill_textconv(r, textconv, df, buf);
6967 free_filespec(df);
6968 return 1;
6969 }
6970
6971 void setup_diff_pager(struct diff_options *opt)
6972 {
6973 /*
6974 * If the user asked for our exit code, then either they want --quiet
6975 * or --exit-code. We should definitely not bother with a pager in the
6976 * former case, as we will generate no output. Since we still properly
6977 * report our exit code even when a pager is run, we _could_ run a
6978 * pager with --exit-code. But since we have not done so historically,
6979 * and because it is easy to find people oneline advising "git diff
6980 * --exit-code" in hooks and other scripts, we do not do so.
6981 */
6982 if (!opt->flags.exit_with_status &&
6983 check_pager_config("diff") != 0)
6984 setup_pager();
6985 }
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