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khash: silence -Wunused-function for delta-islands
[git/debian.git] / diff.c
blob96833c8e81b5d6a7babb523c7ceec0e22ccdab33
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "tempfile.h"
7 #include "quote.h"
8 #include "diff.h"
9 #include "diffcore.h"
10 #include "delta.h"
11 #include "xdiff-interface.h"
12 #include "color.h"
13 #include "attr.h"
14 #include "run-command.h"
15 #include "utf8.h"
16 #include "object-store.h"
17 #include "userdiff.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "hashmap.h"
21 #include "ll-merge.h"
22 #include "string-list.h"
23 #include "argv-array.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "help.h"
27
28 #ifdef NO_FAST_WORKING_DIRECTORY
29 #define FAST_WORKING_DIRECTORY 0
30 #else
31 #define FAST_WORKING_DIRECTORY 1
32 #endif
33
34 static int diff_detect_rename_default;
35 static int diff_indent_heuristic = 1;
36 static int diff_rename_limit_default = 400;
37 static int diff_suppress_blank_empty;
38 static int diff_use_color_default = -1;
39 static int diff_color_moved_default;
40 static int diff_color_moved_ws_default;
41 static int diff_context_default = 3;
42 static int diff_interhunk_context_default;
43 static const char *diff_word_regex_cfg;
44 static const char *external_diff_cmd_cfg;
45 static const char *diff_order_file_cfg;
46 int diff_auto_refresh_index = 1;
47 static int diff_mnemonic_prefix;
48 static int diff_no_prefix;
49 static int diff_stat_graph_width;
50 static int diff_dirstat_permille_default = 30;
51 static struct diff_options default_diff_options;
52 static long diff_algorithm;
53 static unsigned ws_error_highlight_default = WSEH_NEW;
54
55 static char diff_colors[][COLOR_MAXLEN] = {
56 GIT_COLOR_RESET,
57 GIT_COLOR_NORMAL, /* CONTEXT */
58 GIT_COLOR_BOLD, /* METAINFO */
59 GIT_COLOR_CYAN, /* FRAGINFO */
60 GIT_COLOR_RED, /* OLD */
61 GIT_COLOR_GREEN, /* NEW */
62 GIT_COLOR_YELLOW, /* COMMIT */
63 GIT_COLOR_BG_RED, /* WHITESPACE */
64 GIT_COLOR_NORMAL, /* FUNCINFO */
65 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
66 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
67 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
68 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
69 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
70 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
71 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
72 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
73 GIT_COLOR_FAINT, /* CONTEXT_DIM */
74 GIT_COLOR_FAINT_RED, /* OLD_DIM */
75 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
76 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
77 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
78 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
79 };
80
81 static const char *color_diff_slots[] = {
82 [DIFF_CONTEXT] = "context",
83 [DIFF_METAINFO] = "meta",
84 [DIFF_FRAGINFO] = "frag",
85 [DIFF_FILE_OLD] = "old",
86 [DIFF_FILE_NEW] = "new",
87 [DIFF_COMMIT] = "commit",
88 [DIFF_WHITESPACE] = "whitespace",
89 [DIFF_FUNCINFO] = "func",
90 [DIFF_FILE_OLD_MOVED] = "oldMoved",
91 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
92 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
93 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
94 [DIFF_FILE_NEW_MOVED] = "newMoved",
95 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
96 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
97 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
98 [DIFF_CONTEXT_DIM] = "contextDimmed",
99 [DIFF_FILE_OLD_DIM] = "oldDimmed",
100 [DIFF_FILE_NEW_DIM] = "newDimmed",
101 [DIFF_CONTEXT_BOLD] = "contextBold",
102 [DIFF_FILE_OLD_BOLD] = "oldBold",
103 [DIFF_FILE_NEW_BOLD] = "newBold",
104 };
105
106 static NORETURN void die_want_option(const char *option_name)
107 {
108 die(_("option '%s' requires a value"), option_name);
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 else
182 return -1;
183 return 0;
184 }
185
186 int git_config_rename(const char *var, const char *value)
187 {
188 if (!value)
189 return DIFF_DETECT_RENAME;
190 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
191 return DIFF_DETECT_COPY;
192 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
193 }
194
195 long parse_algorithm_value(const char *value)
196 {
197 if (!value)
198 return -1;
199 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
200 return 0;
201 else if (!strcasecmp(value, "minimal"))
202 return XDF_NEED_MINIMAL;
203 else if (!strcasecmp(value, "patience"))
204 return XDF_PATIENCE_DIFF;
205 else if (!strcasecmp(value, "histogram"))
206 return XDF_HISTOGRAM_DIFF;
207 return -1;
208 }
209
210 static int parse_one_token(const char **arg, const char *token)
211 {
212 const char *rest;
213 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
214 *arg = rest;
215 return 1;
216 }
217 return 0;
218 }
219
220 static int parse_ws_error_highlight(const char *arg)
221 {
222 const char *orig_arg = arg;
223 unsigned val = 0;
224
225 while (*arg) {
226 if (parse_one_token(&arg, "none"))
227 val = 0;
228 else if (parse_one_token(&arg, "default"))
229 val = WSEH_NEW;
230 else if (parse_one_token(&arg, "all"))
231 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
232 else if (parse_one_token(&arg, "new"))
233 val |= WSEH_NEW;
234 else if (parse_one_token(&arg, "old"))
235 val |= WSEH_OLD;
236 else if (parse_one_token(&arg, "context"))
237 val |= WSEH_CONTEXT;
238 else {
239 return -1 - (int)(arg - orig_arg);
240 }
241 if (*arg)
242 arg++;
243 }
244 return val;
245 }
246
247 /*
248 * These are to give UI layer defaults.
249 * The core-level commands such as git-diff-files should
250 * never be affected by the setting of diff.renames
251 * the user happens to have in the configuration file.
252 */
253 void init_diff_ui_defaults(void)
254 {
255 diff_detect_rename_default = DIFF_DETECT_RENAME;
256 }
257
258 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
259 {
260 if (!strcmp(var, "diff.indentheuristic"))
261 diff_indent_heuristic = git_config_bool(var, value);
262 return 0;
263 }
264
265 static int parse_color_moved(const char *arg)
266 {
267 switch (git_parse_maybe_bool(arg)) {
268 case 0:
269 return COLOR_MOVED_NO;
270 case 1:
271 return COLOR_MOVED_DEFAULT;
272 default:
273 break;
274 }
275
276 if (!strcmp(arg, "no"))
277 return COLOR_MOVED_NO;
278 else if (!strcmp(arg, "plain"))
279 return COLOR_MOVED_PLAIN;
280 else if (!strcmp(arg, "blocks"))
281 return COLOR_MOVED_BLOCKS;
282 else if (!strcmp(arg, "zebra"))
283 return COLOR_MOVED_ZEBRA;
284 else if (!strcmp(arg, "default"))
285 return COLOR_MOVED_DEFAULT;
286 else if (!strcmp(arg, "dimmed-zebra"))
287 return COLOR_MOVED_ZEBRA_DIM;
288 else if (!strcmp(arg, "dimmed_zebra"))
289 return COLOR_MOVED_ZEBRA_DIM;
290 else
291 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
292 }
293
294 static int parse_color_moved_ws(const char *arg)
295 {
296 int ret = 0;
297 struct string_list l = STRING_LIST_INIT_DUP;
298 struct string_list_item *i;
299
300 string_list_split(&l, arg, ',', -1);
301
302 for_each_string_list_item(i, &l) {
303 struct strbuf sb = STRBUF_INIT;
304 strbuf_addstr(&sb, i->string);
305 strbuf_trim(&sb);
306
307 if (!strcmp(sb.buf, "ignore-space-change"))
308 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
309 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
310 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
311 else if (!strcmp(sb.buf, "ignore-all-space"))
312 ret |= XDF_IGNORE_WHITESPACE;
313 else if (!strcmp(sb.buf, "allow-indentation-change"))
314 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
315 else
316 error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
317
318 strbuf_release(&sb);
319 }
320
321 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
322 (ret & XDF_WHITESPACE_FLAGS))
323 die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
324
325 string_list_clear(&l, 0);
326
327 return ret;
328 }
329
330 int git_diff_ui_config(const char *var, const char *value, void *cb)
331 {
332 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
333 diff_use_color_default = git_config_colorbool(var, value);
334 return 0;
335 }
336 if (!strcmp(var, "diff.colormoved")) {
337 int cm = parse_color_moved(value);
338 if (cm < 0)
339 return -1;
340 diff_color_moved_default = cm;
341 return 0;
342 }
343 if (!strcmp(var, "diff.colormovedws")) {
344 int cm = parse_color_moved_ws(value);
345 if (cm < 0)
346 return -1;
347 diff_color_moved_ws_default = cm;
348 return 0;
349 }
350 if (!strcmp(var, "diff.context")) {
351 diff_context_default = git_config_int(var, value);
352 if (diff_context_default < 0)
353 return -1;
354 return 0;
355 }
356 if (!strcmp(var, "diff.interhunkcontext")) {
357 diff_interhunk_context_default = git_config_int(var, value);
358 if (diff_interhunk_context_default < 0)
359 return -1;
360 return 0;
361 }
362 if (!strcmp(var, "diff.renames")) {
363 diff_detect_rename_default = git_config_rename(var, value);
364 return 0;
365 }
366 if (!strcmp(var, "diff.autorefreshindex")) {
367 diff_auto_refresh_index = git_config_bool(var, value);
368 return 0;
369 }
370 if (!strcmp(var, "diff.mnemonicprefix")) {
371 diff_mnemonic_prefix = git_config_bool(var, value);
372 return 0;
373 }
374 if (!strcmp(var, "diff.noprefix")) {
375 diff_no_prefix = git_config_bool(var, value);
376 return 0;
377 }
378 if (!strcmp(var, "diff.statgraphwidth")) {
379 diff_stat_graph_width = git_config_int(var, value);
380 return 0;
381 }
382 if (!strcmp(var, "diff.external"))
383 return git_config_string(&external_diff_cmd_cfg, var, value);
384 if (!strcmp(var, "diff.wordregex"))
385 return git_config_string(&diff_word_regex_cfg, var, value);
386 if (!strcmp(var, "diff.orderfile"))
387 return git_config_pathname(&diff_order_file_cfg, var, value);
388
389 if (!strcmp(var, "diff.ignoresubmodules"))
390 handle_ignore_submodules_arg(&default_diff_options, value);
391
392 if (!strcmp(var, "diff.submodule")) {
393 if (parse_submodule_params(&default_diff_options, value))
394 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
395 value);
396 return 0;
397 }
398
399 if (!strcmp(var, "diff.algorithm")) {
400 diff_algorithm = parse_algorithm_value(value);
401 if (diff_algorithm < 0)
402 return -1;
403 return 0;
404 }
405
406 if (!strcmp(var, "diff.wserrorhighlight")) {
407 int val = parse_ws_error_highlight(value);
408 if (val < 0)
409 return -1;
410 ws_error_highlight_default = val;
411 return 0;
412 }
413
414 if (git_color_config(var, value, cb) < 0)
415 return -1;
416
417 return git_diff_basic_config(var, value, cb);
418 }
419
420 int git_diff_basic_config(const char *var, const char *value, void *cb)
421 {
422 const char *name;
423
424 if (!strcmp(var, "diff.renamelimit")) {
425 diff_rename_limit_default = git_config_int(var, value);
426 return 0;
427 }
428
429 if (userdiff_config(var, value) < 0)
430 return -1;
431
432 if (skip_prefix(var, "diff.color.", &name) ||
433 skip_prefix(var, "color.diff.", &name)) {
434 int slot = parse_diff_color_slot(name);
435 if (slot < 0)
436 return 0;
437 if (!value)
438 return config_error_nonbool(var);
439 return color_parse(value, diff_colors[slot]);
440 }
441
442 /* like GNU diff's --suppress-blank-empty option */
443 if (!strcmp(var, "diff.suppressblankempty") ||
444 /* for backwards compatibility */
445 !strcmp(var, "diff.suppress-blank-empty")) {
446 diff_suppress_blank_empty = git_config_bool(var, value);
447 return 0;
448 }
449
450 if (!strcmp(var, "diff.dirstat")) {
451 struct strbuf errmsg = STRBUF_INIT;
452 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
453 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
454 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
455 errmsg.buf);
456 strbuf_release(&errmsg);
457 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
458 return 0;
459 }
460
461 if (git_diff_heuristic_config(var, value, cb) < 0)
462 return -1;
463
464 return git_default_config(var, value, cb);
465 }
466
467 static char *quote_two(const char *one, const char *two)
468 {
469 int need_one = quote_c_style(one, NULL, NULL, 1);
470 int need_two = quote_c_style(two, NULL, NULL, 1);
471 struct strbuf res = STRBUF_INIT;
472
473 if (need_one + need_two) {
474 strbuf_addch(&res, '"');
475 quote_c_style(one, &res, NULL, 1);
476 quote_c_style(two, &res, NULL, 1);
477 strbuf_addch(&res, '"');
478 } else {
479 strbuf_addstr(&res, one);
480 strbuf_addstr(&res, two);
481 }
482 return strbuf_detach(&res, NULL);
483 }
484
485 static const char *external_diff(void)
486 {
487 static const char *external_diff_cmd = NULL;
488 static int done_preparing = 0;
489
490 if (done_preparing)
491 return external_diff_cmd;
492 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
493 if (!external_diff_cmd)
494 external_diff_cmd = external_diff_cmd_cfg;
495 done_preparing = 1;
496 return external_diff_cmd;
497 }
498
499 /*
500 * Keep track of files used for diffing. Sometimes such an entry
501 * refers to a temporary file, sometimes to an existing file, and
502 * sometimes to "/dev/null".
503 */
504 static struct diff_tempfile {
505 /*
506 * filename external diff should read from, or NULL if this
507 * entry is currently not in use:
508 */
509 const char *name;
510
511 char hex[GIT_MAX_HEXSZ + 1];
512 char mode[10];
513
514 /*
515 * If this diff_tempfile instance refers to a temporary file,
516 * this tempfile object is used to manage its lifetime.
517 */
518 struct tempfile *tempfile;
519 } diff_temp[2];
520
521 struct emit_callback {
522 int color_diff;
523 unsigned ws_rule;
524 int blank_at_eof_in_preimage;
525 int blank_at_eof_in_postimage;
526 int lno_in_preimage;
527 int lno_in_postimage;
528 const char **label_path;
529 struct diff_words_data *diff_words;
530 struct diff_options *opt;
531 struct strbuf *header;
532 };
533
534 static int count_lines(const char *data, int size)
535 {
536 int count, ch, completely_empty = 1, nl_just_seen = 0;
537 count = 0;
538 while (0 < size--) {
539 ch = *data++;
540 if (ch == '\n') {
541 count++;
542 nl_just_seen = 1;
543 completely_empty = 0;
544 }
545 else {
546 nl_just_seen = 0;
547 completely_empty = 0;
548 }
549 }
550 if (completely_empty)
551 return 0;
552 if (!nl_just_seen)
553 count++; /* no trailing newline */
554 return count;
555 }
556
557 static int fill_mmfile(struct repository *r, mmfile_t *mf,
558 struct diff_filespec *one)
559 {
560 if (!DIFF_FILE_VALID(one)) {
561 mf->ptr = (char *)""; /* does not matter */
562 mf->size = 0;
563 return 0;
564 }
565 else if (diff_populate_filespec(r, one, 0))
566 return -1;
567
568 mf->ptr = one->data;
569 mf->size = one->size;
570 return 0;
571 }
572
573 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
574 static unsigned long diff_filespec_size(struct repository *r,
575 struct diff_filespec *one)
576 {
577 if (!DIFF_FILE_VALID(one))
578 return 0;
579 diff_populate_filespec(r, one, CHECK_SIZE_ONLY);
580 return one->size;
581 }
582
583 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
584 {
585 char *ptr = mf->ptr;
586 long size = mf->size;
587 int cnt = 0;
588
589 if (!size)
590 return cnt;
591 ptr += size - 1; /* pointing at the very end */
592 if (*ptr != '\n')
593 ; /* incomplete line */
594 else
595 ptr--; /* skip the last LF */
596 while (mf->ptr < ptr) {
597 char *prev_eol;
598 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
599 if (*prev_eol == '\n')
600 break;
601 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
602 break;
603 cnt++;
604 ptr = prev_eol - 1;
605 }
606 return cnt;
607 }
608
609 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
610 struct emit_callback *ecbdata)
611 {
612 int l1, l2, at;
613 unsigned ws_rule = ecbdata->ws_rule;
614 l1 = count_trailing_blank(mf1, ws_rule);
615 l2 = count_trailing_blank(mf2, ws_rule);
616 if (l2 <= l1) {
617 ecbdata->blank_at_eof_in_preimage = 0;
618 ecbdata->blank_at_eof_in_postimage = 0;
619 return;
620 }
621 at = count_lines(mf1->ptr, mf1->size);
622 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
623
624 at = count_lines(mf2->ptr, mf2->size);
625 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
626 }
627
628 static void emit_line_0(struct diff_options *o,
629 const char *set_sign, const char *set, unsigned reverse, const char *reset,
630 int first, const char *line, int len)
631 {
632 int has_trailing_newline, has_trailing_carriage_return;
633 int needs_reset = 0; /* at the end of the line */
634 FILE *file = o->file;
635
636 fputs(diff_line_prefix(o), file);
637
638 has_trailing_newline = (len > 0 && line[len-1] == '\n');
639 if (has_trailing_newline)
640 len--;
641
642 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
643 if (has_trailing_carriage_return)
644 len--;
645
646 if (!len && !first)
647 goto end_of_line;
648
649 if (reverse && want_color(o->use_color)) {
650 fputs(GIT_COLOR_REVERSE, file);
651 needs_reset = 1;
652 }
653
654 if (set_sign) {
655 fputs(set_sign, file);
656 needs_reset = 1;
657 }
658
659 if (first)
660 fputc(first, file);
661
662 if (!len)
663 goto end_of_line;
664
665 if (set) {
666 if (set_sign && set != set_sign)
667 fputs(reset, file);
668 fputs(set, file);
669 needs_reset = 1;
670 }
671 fwrite(line, len, 1, file);
672 needs_reset = 1; /* 'line' may contain color codes. */
673
674 end_of_line:
675 if (needs_reset)
676 fputs(reset, file);
677 if (has_trailing_carriage_return)
678 fputc('\r', file);
679 if (has_trailing_newline)
680 fputc('\n', file);
681 }
682
683 static void emit_line(struct diff_options *o, const char *set, const char *reset,
684 const char *line, int len)
685 {
686 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
687 }
688
689 enum diff_symbol {
690 DIFF_SYMBOL_BINARY_DIFF_HEADER,
691 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
692 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
693 DIFF_SYMBOL_BINARY_DIFF_BODY,
694 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
695 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
696 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
697 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
698 DIFF_SYMBOL_STATS_LINE,
699 DIFF_SYMBOL_WORD_DIFF,
700 DIFF_SYMBOL_STAT_SEP,
701 DIFF_SYMBOL_SUMMARY,
702 DIFF_SYMBOL_SUBMODULE_ADD,
703 DIFF_SYMBOL_SUBMODULE_DEL,
704 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
705 DIFF_SYMBOL_SUBMODULE_MODIFIED,
706 DIFF_SYMBOL_SUBMODULE_HEADER,
707 DIFF_SYMBOL_SUBMODULE_ERROR,
708 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
709 DIFF_SYMBOL_REWRITE_DIFF,
710 DIFF_SYMBOL_BINARY_FILES,
711 DIFF_SYMBOL_HEADER,
712 DIFF_SYMBOL_FILEPAIR_PLUS,
713 DIFF_SYMBOL_FILEPAIR_MINUS,
714 DIFF_SYMBOL_WORDS_PORCELAIN,
715 DIFF_SYMBOL_WORDS,
716 DIFF_SYMBOL_CONTEXT,
717 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
718 DIFF_SYMBOL_PLUS,
719 DIFF_SYMBOL_MINUS,
720 DIFF_SYMBOL_NO_LF_EOF,
721 DIFF_SYMBOL_CONTEXT_FRAGINFO,
722 DIFF_SYMBOL_CONTEXT_MARKER,
723 DIFF_SYMBOL_SEPARATOR
724 };
725 /*
726 * Flags for content lines:
727 * 0..12 are whitespace rules
728 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
729 * 16 is marking if the line is blank at EOF
730 */
731 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
732 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
733 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
734 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
735 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
736
737 /*
738 * This struct is used when we need to buffer the output of the diff output.
739 *
740 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
741 * into the pre/post image file. This pointer could be a union with the
742 * line pointer. By storing an offset into the file instead of the literal line,
743 * we can decrease the memory footprint for the buffered output. At first we
744 * may want to only have indirection for the content lines, but we could also
745 * enhance the state for emitting prefabricated lines, e.g. the similarity
746 * score line or hunk/file headers would only need to store a number or path
747 * and then the output can be constructed later on depending on state.
748 */
749 struct emitted_diff_symbol {
750 const char *line;
751 int len;
752 int flags;
753 enum diff_symbol s;
754 };
755 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
756
757 struct emitted_diff_symbols {
758 struct emitted_diff_symbol *buf;
759 int nr, alloc;
760 };
761 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
762
763 static void append_emitted_diff_symbol(struct diff_options *o,
764 struct emitted_diff_symbol *e)
765 {
766 struct emitted_diff_symbol *f;
767
768 ALLOC_GROW(o->emitted_symbols->buf,
769 o->emitted_symbols->nr + 1,
770 o->emitted_symbols->alloc);
771 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
772
773 memcpy(f, e, sizeof(struct emitted_diff_symbol));
774 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
775 }
776
777 struct moved_entry {
778 struct hashmap_entry ent;
779 const struct emitted_diff_symbol *es;
780 struct moved_entry *next_line;
781 };
782
783 /**
784 * The struct ws_delta holds white space differences between moved lines, i.e.
785 * between '+' and '-' lines that have been detected to be a move.
786 * The string contains the difference in leading white spaces, before the
787 * rest of the line is compared using the white space config for move
788 * coloring. The current_longer indicates if the first string in the
789 * comparision is longer than the second.
790 */
791 struct ws_delta {
792 char *string;
793 unsigned int current_longer : 1;
794 };
795 #define WS_DELTA_INIT { NULL, 0 }
796
797 struct moved_block {
798 struct moved_entry *match;
799 struct ws_delta wsd;
800 };
801
802 static void moved_block_clear(struct moved_block *b)
803 {
804 FREE_AND_NULL(b->wsd.string);
805 b->match = NULL;
806 }
807
808 static int compute_ws_delta(const struct emitted_diff_symbol *a,
809 const struct emitted_diff_symbol *b,
810 struct ws_delta *out)
811 {
812 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
813 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
814 int d = longer->len - shorter->len;
815
816 if (strncmp(longer->line + d, shorter->line, shorter->len))
817 return 0;
818
819 out->string = xmemdupz(longer->line, d);
820 out->current_longer = (a == longer);
821
822 return 1;
823 }
824
825 static int cmp_in_block_with_wsd(const struct diff_options *o,
826 const struct moved_entry *cur,
827 const struct moved_entry *match,
828 struct moved_block *pmb,
829 int n)
830 {
831 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
832 int al = cur->es->len, cl = l->len;
833 const char *a = cur->es->line,
834 *b = match->es->line,
835 *c = l->line;
836
837 int wslen;
838
839 /*
840 * We need to check if 'cur' is equal to 'match'.
841 * As those are from the same (+/-) side, we do not need to adjust for
842 * indent changes. However these were found using fuzzy matching
843 * so we do have to check if they are equal.
844 */
845 if (strcmp(a, b))
846 return 1;
847
848 if (!pmb->wsd.string)
849 /*
850 * The white space delta is not active? This can happen
851 * when we exit early in this function.
852 */
853 return 1;
854
855 /*
856 * The indent changes of the block are known and stored in
857 * pmb->wsd; however we need to check if the indent changes of the
858 * current line are still the same as before.
859 *
860 * To do so we need to compare 'l' to 'cur', adjusting the
861 * one of them for the white spaces, depending which was longer.
862 */
863
864 wslen = strlen(pmb->wsd.string);
865 if (pmb->wsd.current_longer) {
866 c += wslen;
867 cl -= wslen;
868 } else {
869 a += wslen;
870 al -= wslen;
871 }
872
873 if (al != cl || memcmp(a, c, al))
874 return 1;
875
876 return 0;
877 }
878
879 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
880 const void *entry,
881 const void *entry_or_key,
882 const void *keydata)
883 {
884 const struct diff_options *diffopt = hashmap_cmp_fn_data;
885 const struct moved_entry *a = entry;
886 const struct moved_entry *b = entry_or_key;
887 unsigned flags = diffopt->color_moved_ws_handling
888 & XDF_WHITESPACE_FLAGS;
889
890 if (diffopt->color_moved_ws_handling &
891 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
892 /*
893 * As there is not specific white space config given,
894 * we'd need to check for a new block, so ignore all
895 * white space. The setup of the white space
896 * configuration for the next block is done else where
897 */
898 flags |= XDF_IGNORE_WHITESPACE;
899
900 return !xdiff_compare_lines(a->es->line, a->es->len,
901 b->es->line, b->es->len,
902 flags);
903 }
904
905 static struct moved_entry *prepare_entry(struct diff_options *o,
906 int line_no)
907 {
908 struct moved_entry *ret = xmalloc(sizeof(*ret));
909 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
910 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
911
912 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
913 ret->es = l;
914 ret->next_line = NULL;
915
916 return ret;
917 }
918
919 static void add_lines_to_move_detection(struct diff_options *o,
920 struct hashmap *add_lines,
921 struct hashmap *del_lines)
922 {
923 struct moved_entry *prev_line = NULL;
924
925 int n;
926 for (n = 0; n < o->emitted_symbols->nr; n++) {
927 struct hashmap *hm;
928 struct moved_entry *key;
929
930 switch (o->emitted_symbols->buf[n].s) {
931 case DIFF_SYMBOL_PLUS:
932 hm = add_lines;
933 break;
934 case DIFF_SYMBOL_MINUS:
935 hm = del_lines;
936 break;
937 default:
938 prev_line = NULL;
939 continue;
940 }
941
942 key = prepare_entry(o, n);
943 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
944 prev_line->next_line = key;
945
946 hashmap_add(hm, key);
947 prev_line = key;
948 }
949 }
950
951 static void pmb_advance_or_null(struct diff_options *o,
952 struct moved_entry *match,
953 struct hashmap *hm,
954 struct moved_block *pmb,
955 int pmb_nr)
956 {
957 int i;
958 for (i = 0; i < pmb_nr; i++) {
959 struct moved_entry *prev = pmb[i].match;
960 struct moved_entry *cur = (prev && prev->next_line) ?
961 prev->next_line : NULL;
962 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
963 pmb[i].match = cur;
964 } else {
965 pmb[i].match = NULL;
966 }
967 }
968 }
969
970 static void pmb_advance_or_null_multi_match(struct diff_options *o,
971 struct moved_entry *match,
972 struct hashmap *hm,
973 struct moved_block *pmb,
974 int pmb_nr, int n)
975 {
976 int i;
977 char *got_match = xcalloc(1, pmb_nr);
978
979 for (; match; match = hashmap_get_next(hm, match)) {
980 for (i = 0; i < pmb_nr; i++) {
981 struct moved_entry *prev = pmb[i].match;
982 struct moved_entry *cur = (prev && prev->next_line) ?
983 prev->next_line : NULL;
984 if (!cur)
985 continue;
986 if (!cmp_in_block_with_wsd(o, cur, match, &pmb[i], n))
987 got_match[i] |= 1;
988 }
989 }
990
991 for (i = 0; i < pmb_nr; i++) {
992 if (got_match[i]) {
993 /* Advance to the next line */
994 pmb[i].match = pmb[i].match->next_line;
995 } else {
996 moved_block_clear(&pmb[i]);
997 }
998 }
999
1000 free(got_match);
1001 }
1002
1003 static int shrink_potential_moved_blocks(struct moved_block *pmb,
1004 int pmb_nr)
1005 {
1006 int lp, rp;
1007
1008 /* Shrink the set of potential block to the remaining running */
1009 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
1010 while (lp < pmb_nr && pmb[lp].match)
1011 lp++;
1012 /* lp points at the first NULL now */
1013
1014 while (rp > -1 && !pmb[rp].match)
1015 rp--;
1016 /* rp points at the last non-NULL */
1017
1018 if (lp < pmb_nr && rp > -1 && lp < rp) {
1019 pmb[lp] = pmb[rp];
1020 pmb[rp].match = NULL;
1021 pmb[rp].wsd.string = NULL;
1022 rp--;
1023 lp++;
1024 }
1025 }
1026
1027 /* Remember the number of running sets */
1028 return rp + 1;
1029 }
1030
1031 /*
1032 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1033 *
1034 * Otherwise, if the last block has fewer alphanumeric characters than
1035 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1036 * that block.
1037 *
1038 * The last block consists of the (n - block_length)'th line up to but not
1039 * including the nth line.
1040 *
1041 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1042 * Think of a way to unify them.
1043 */
1044 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1045 {
1046 int i, alnum_count = 0;
1047 if (o->color_moved == COLOR_MOVED_PLAIN)
1048 return;
1049 for (i = 1; i < block_length + 1; i++) {
1050 const char *c = o->emitted_symbols->buf[n - i].line;
1051 for (; *c; c++) {
1052 if (!isalnum(*c))
1053 continue;
1054 alnum_count++;
1055 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1056 return;
1057 }
1058 }
1059 for (i = 1; i < block_length + 1; i++)
1060 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1061 }
1062
1063 /* Find blocks of moved code, delegate actual coloring decision to helper */
1064 static void mark_color_as_moved(struct diff_options *o,
1065 struct hashmap *add_lines,
1066 struct hashmap *del_lines)
1067 {
1068 struct moved_block *pmb = NULL; /* potentially moved blocks */
1069 int pmb_nr = 0, pmb_alloc = 0;
1070 int n, flipped_block = 1, block_length = 0;
1071
1072
1073 for (n = 0; n < o->emitted_symbols->nr; n++) {
1074 struct hashmap *hm = NULL;
1075 struct moved_entry *key;
1076 struct moved_entry *match = NULL;
1077 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1078
1079 switch (l->s) {
1080 case DIFF_SYMBOL_PLUS:
1081 hm = del_lines;
1082 key = prepare_entry(o, n);
1083 match = hashmap_get(hm, key, NULL);
1084 free(key);
1085 break;
1086 case DIFF_SYMBOL_MINUS:
1087 hm = add_lines;
1088 key = prepare_entry(o, n);
1089 match = hashmap_get(hm, key, NULL);
1090 free(key);
1091 break;
1092 default:
1093 flipped_block = 1;
1094 }
1095
1096 if (!match) {
1097 int i;
1098
1099 adjust_last_block(o, n, block_length);
1100 for(i = 0; i < pmb_nr; i++)
1101 moved_block_clear(&pmb[i]);
1102 pmb_nr = 0;
1103 block_length = 0;
1104 continue;
1105 }
1106
1107 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1108
1109 if (o->color_moved == COLOR_MOVED_PLAIN)
1110 continue;
1111
1112 if (o->color_moved_ws_handling &
1113 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1114 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1115 else
1116 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1117
1118 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1119
1120 if (pmb_nr == 0) {
1121 /*
1122 * The current line is the start of a new block.
1123 * Setup the set of potential blocks.
1124 */
1125 for (; match; match = hashmap_get_next(hm, match)) {
1126 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1127 if (o->color_moved_ws_handling &
1128 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1129 if (compute_ws_delta(l, match->es,
1130 &pmb[pmb_nr].wsd))
1131 pmb[pmb_nr++].match = match;
1132 } else {
1133 pmb[pmb_nr].wsd.string = NULL;
1134 pmb[pmb_nr++].match = match;
1135 }
1136 }
1137
1138 flipped_block = (flipped_block + 1) % 2;
1139
1140 adjust_last_block(o, n, block_length);
1141 block_length = 0;
1142 }
1143
1144 block_length++;
1145
1146 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1147 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1148 }
1149 adjust_last_block(o, n, block_length);
1150
1151 for(n = 0; n < pmb_nr; n++)
1152 moved_block_clear(&pmb[n]);
1153 free(pmb);
1154 }
1155
1156 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1157 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1158 static void dim_moved_lines(struct diff_options *o)
1159 {
1160 int n;
1161 for (n = 0; n < o->emitted_symbols->nr; n++) {
1162 struct emitted_diff_symbol *prev = (n != 0) ?
1163 &o->emitted_symbols->buf[n - 1] : NULL;
1164 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1165 struct emitted_diff_symbol *next =
1166 (n < o->emitted_symbols->nr - 1) ?
1167 &o->emitted_symbols->buf[n + 1] : NULL;
1168
1169 /* Not a plus or minus line? */
1170 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1171 continue;
1172
1173 /* Not a moved line? */
1174 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1175 continue;
1176
1177 /*
1178 * If prev or next are not a plus or minus line,
1179 * pretend they don't exist
1180 */
1181 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1182 prev->s != DIFF_SYMBOL_MINUS)
1183 prev = NULL;
1184 if (next && next->s != DIFF_SYMBOL_PLUS &&
1185 next->s != DIFF_SYMBOL_MINUS)
1186 next = NULL;
1187
1188 /* Inside a block? */
1189 if ((prev &&
1190 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1191 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1192 (next &&
1193 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1194 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1195 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1196 continue;
1197 }
1198
1199 /* Check if we are at an interesting bound: */
1200 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1201 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1202 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1203 continue;
1204 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1205 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1206 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1207 continue;
1208
1209 /*
1210 * The boundary to prev and next are not interesting,
1211 * so this line is not interesting as a whole
1212 */
1213 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1214 }
1215 }
1216
1217 static void emit_line_ws_markup(struct diff_options *o,
1218 const char *set_sign, const char *set,
1219 const char *reset,
1220 char sign, const char *line, int len,
1221 unsigned ws_rule, int blank_at_eof)
1222 {
1223 const char *ws = NULL;
1224
1225 if (o->ws_error_highlight & ws_rule) {
1226 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1227 if (!*ws)
1228 ws = NULL;
1229 }
1230
1231 if (!ws && !set_sign)
1232 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1233 else if (!ws) {
1234 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1235 } else if (blank_at_eof)
1236 /* Blank line at EOF - paint '+' as well */
1237 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1238 else {
1239 /* Emit just the prefix, then the rest. */
1240 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1241 sign, "", 0);
1242 ws_check_emit(line, len, ws_rule,
1243 o->file, set, reset, ws);
1244 }
1245 }
1246
1247 static void emit_diff_symbol_from_struct(struct diff_options *o,
1248 struct emitted_diff_symbol *eds)
1249 {
1250 static const char *nneof = " No newline at end of file\n";
1251 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1252 struct strbuf sb = STRBUF_INIT;
1253
1254 enum diff_symbol s = eds->s;
1255 const char *line = eds->line;
1256 int len = eds->len;
1257 unsigned flags = eds->flags;
1258
1259 switch (s) {
1260 case DIFF_SYMBOL_NO_LF_EOF:
1261 context = diff_get_color_opt(o, DIFF_CONTEXT);
1262 reset = diff_get_color_opt(o, DIFF_RESET);
1263 putc('\n', o->file);
1264 emit_line_0(o, context, NULL, 0, reset, '\\',
1265 nneof, strlen(nneof));
1266 break;
1267 case DIFF_SYMBOL_SUBMODULE_HEADER:
1268 case DIFF_SYMBOL_SUBMODULE_ERROR:
1269 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1270 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1271 case DIFF_SYMBOL_SUMMARY:
1272 case DIFF_SYMBOL_STATS_LINE:
1273 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1274 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1275 emit_line(o, "", "", line, len);
1276 break;
1277 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1278 case DIFF_SYMBOL_CONTEXT_MARKER:
1279 context = diff_get_color_opt(o, DIFF_CONTEXT);
1280 reset = diff_get_color_opt(o, DIFF_RESET);
1281 emit_line(o, context, reset, line, len);
1282 break;
1283 case DIFF_SYMBOL_SEPARATOR:
1284 fprintf(o->file, "%s%c",
1285 diff_line_prefix(o),
1286 o->line_termination);
1287 break;
1288 case DIFF_SYMBOL_CONTEXT:
1289 set = diff_get_color_opt(o, DIFF_CONTEXT);
1290 reset = diff_get_color_opt(o, DIFF_RESET);
1291 set_sign = NULL;
1292 if (o->flags.dual_color_diffed_diffs) {
1293 char c = !len ? 0 : line[0];
1294
1295 if (c == '+')
1296 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1297 else if (c == '@')
1298 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1299 else if (c == '-')
1300 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1301 }
1302 emit_line_ws_markup(o, set_sign, set, reset,
1303 o->output_indicators[OUTPUT_INDICATOR_CONTEXT],
1304 line, len,
1305 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1306 break;
1307 case DIFF_SYMBOL_PLUS:
1308 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1309 DIFF_SYMBOL_MOVED_LINE_ALT |
1310 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1311 case DIFF_SYMBOL_MOVED_LINE |
1312 DIFF_SYMBOL_MOVED_LINE_ALT |
1313 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1314 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1315 break;
1316 case DIFF_SYMBOL_MOVED_LINE |
1317 DIFF_SYMBOL_MOVED_LINE_ALT:
1318 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1319 break;
1320 case DIFF_SYMBOL_MOVED_LINE |
1321 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1322 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1323 break;
1324 case DIFF_SYMBOL_MOVED_LINE:
1325 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1326 break;
1327 default:
1328 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1329 }
1330 reset = diff_get_color_opt(o, DIFF_RESET);
1331 if (!o->flags.dual_color_diffed_diffs)
1332 set_sign = NULL;
1333 else {
1334 char c = !len ? 0 : line[0];
1335
1336 set_sign = set;
1337 if (c == '-')
1338 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1339 else if (c == '@')
1340 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1341 else if (c == '+')
1342 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1343 else
1344 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1345 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1346 }
1347 emit_line_ws_markup(o, set_sign, set, reset,
1348 o->output_indicators[OUTPUT_INDICATOR_NEW],
1349 line, len,
1350 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1351 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1352 break;
1353 case DIFF_SYMBOL_MINUS:
1354 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1355 DIFF_SYMBOL_MOVED_LINE_ALT |
1356 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1357 case DIFF_SYMBOL_MOVED_LINE |
1358 DIFF_SYMBOL_MOVED_LINE_ALT |
1359 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1360 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1361 break;
1362 case DIFF_SYMBOL_MOVED_LINE |
1363 DIFF_SYMBOL_MOVED_LINE_ALT:
1364 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1365 break;
1366 case DIFF_SYMBOL_MOVED_LINE |
1367 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1368 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1369 break;
1370 case DIFF_SYMBOL_MOVED_LINE:
1371 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1372 break;
1373 default:
1374 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1375 }
1376 reset = diff_get_color_opt(o, DIFF_RESET);
1377 if (!o->flags.dual_color_diffed_diffs)
1378 set_sign = NULL;
1379 else {
1380 char c = !len ? 0 : line[0];
1381
1382 set_sign = set;
1383 if (c == '+')
1384 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1385 else if (c == '@')
1386 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1387 else if (c == '-')
1388 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1389 else
1390 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1391 }
1392 emit_line_ws_markup(o, set_sign, set, reset,
1393 o->output_indicators[OUTPUT_INDICATOR_OLD],
1394 line, len,
1395 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1396 break;
1397 case DIFF_SYMBOL_WORDS_PORCELAIN:
1398 context = diff_get_color_opt(o, DIFF_CONTEXT);
1399 reset = diff_get_color_opt(o, DIFF_RESET);
1400 emit_line(o, context, reset, line, len);
1401 fputs("~\n", o->file);
1402 break;
1403 case DIFF_SYMBOL_WORDS:
1404 context = diff_get_color_opt(o, DIFF_CONTEXT);
1405 reset = diff_get_color_opt(o, DIFF_RESET);
1406 /*
1407 * Skip the prefix character, if any. With
1408 * diff_suppress_blank_empty, there may be
1409 * none.
1410 */
1411 if (line[0] != '\n') {
1412 line++;
1413 len--;
1414 }
1415 emit_line(o, context, reset, line, len);
1416 break;
1417 case DIFF_SYMBOL_FILEPAIR_PLUS:
1418 meta = diff_get_color_opt(o, DIFF_METAINFO);
1419 reset = diff_get_color_opt(o, DIFF_RESET);
1420 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1421 line, reset,
1422 strchr(line, ' ') ? "\t" : "");
1423 break;
1424 case DIFF_SYMBOL_FILEPAIR_MINUS:
1425 meta = diff_get_color_opt(o, DIFF_METAINFO);
1426 reset = diff_get_color_opt(o, DIFF_RESET);
1427 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1428 line, reset,
1429 strchr(line, ' ') ? "\t" : "");
1430 break;
1431 case DIFF_SYMBOL_BINARY_FILES:
1432 case DIFF_SYMBOL_HEADER:
1433 fprintf(o->file, "%s", line);
1434 break;
1435 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1436 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1437 break;
1438 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1439 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1440 break;
1441 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1442 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1443 break;
1444 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1445 fputs(diff_line_prefix(o), o->file);
1446 fputc('\n', o->file);
1447 break;
1448 case DIFF_SYMBOL_REWRITE_DIFF:
1449 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1450 reset = diff_get_color_opt(o, DIFF_RESET);
1451 emit_line(o, fraginfo, reset, line, len);
1452 break;
1453 case DIFF_SYMBOL_SUBMODULE_ADD:
1454 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1455 reset = diff_get_color_opt(o, DIFF_RESET);
1456 emit_line(o, set, reset, line, len);
1457 break;
1458 case DIFF_SYMBOL_SUBMODULE_DEL:
1459 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1460 reset = diff_get_color_opt(o, DIFF_RESET);
1461 emit_line(o, set, reset, line, len);
1462 break;
1463 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1464 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1465 diff_line_prefix(o), line);
1466 break;
1467 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1468 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1469 diff_line_prefix(o), line);
1470 break;
1471 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1472 emit_line(o, "", "", " 0 files changed\n",
1473 strlen(" 0 files changed\n"));
1474 break;
1475 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1476 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1477 break;
1478 case DIFF_SYMBOL_WORD_DIFF:
1479 fprintf(o->file, "%.*s", len, line);
1480 break;
1481 case DIFF_SYMBOL_STAT_SEP:
1482 fputs(o->stat_sep, o->file);
1483 break;
1484 default:
1485 BUG("unknown diff symbol");
1486 }
1487 strbuf_release(&sb);
1488 }
1489
1490 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1491 const char *line, int len, unsigned flags)
1492 {
1493 struct emitted_diff_symbol e = {line, len, flags, s};
1494
1495 if (o->emitted_symbols)
1496 append_emitted_diff_symbol(o, &e);
1497 else
1498 emit_diff_symbol_from_struct(o, &e);
1499 }
1500
1501 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1502 {
1503 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1504 }
1505
1506 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1507 {
1508 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1509 }
1510
1511 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1512 {
1513 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1514 path, strlen(path), 0);
1515 }
1516
1517 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1518 {
1519 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1520 path, strlen(path), 0);
1521 }
1522
1523 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1524 {
1525 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1526 header, strlen(header), 0);
1527 }
1528
1529 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1530 {
1531 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1532 }
1533
1534 void diff_emit_submodule_pipethrough(struct diff_options *o,
1535 const char *line, int len)
1536 {
1537 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1538 }
1539
1540 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1541 {
1542 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1543 ecbdata->blank_at_eof_in_preimage &&
1544 ecbdata->blank_at_eof_in_postimage &&
1545 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1546 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1547 return 0;
1548 return ws_blank_line(line, len, ecbdata->ws_rule);
1549 }
1550
1551 static void emit_add_line(const char *reset,
1552 struct emit_callback *ecbdata,
1553 const char *line, int len)
1554 {
1555 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1556 if (new_blank_line_at_eof(ecbdata, line, len))
1557 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1558
1559 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1560 }
1561
1562 static void emit_del_line(const char *reset,
1563 struct emit_callback *ecbdata,
1564 const char *line, int len)
1565 {
1566 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1567 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1568 }
1569
1570 static void emit_context_line(const char *reset,
1571 struct emit_callback *ecbdata,
1572 const char *line, int len)
1573 {
1574 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1575 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1576 }
1577
1578 static void emit_hunk_header(struct emit_callback *ecbdata,
1579 const char *line, int len)
1580 {
1581 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1582 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1583 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1584 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1585 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1586 static const char atat[2] = { '@', '@' };
1587 const char *cp, *ep;
1588 struct strbuf msgbuf = STRBUF_INIT;
1589 int org_len = len;
1590 int i = 1;
1591
1592 /*
1593 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1594 * it always is at least 10 bytes long.
1595 */
1596 if (len < 10 ||
1597 memcmp(line, atat, 2) ||
1598 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1599 emit_diff_symbol(ecbdata->opt,
1600 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1601 return;
1602 }
1603 ep += 2; /* skip over @@ */
1604
1605 /* The hunk header in fraginfo color */
1606 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1607 strbuf_addstr(&msgbuf, reverse);
1608 strbuf_addstr(&msgbuf, frag);
1609 strbuf_add(&msgbuf, line, ep - line);
1610 strbuf_addstr(&msgbuf, reset);
1611
1612 /*
1613 * trailing "\r\n"
1614 */
1615 for ( ; i < 3; i++)
1616 if (line[len - i] == '\r' || line[len - i] == '\n')
1617 len--;
1618
1619 /* blank before the func header */
1620 for (cp = ep; ep - line < len; ep++)
1621 if (*ep != ' ' && *ep != '\t')
1622 break;
1623 if (ep != cp) {
1624 strbuf_addstr(&msgbuf, context);
1625 strbuf_add(&msgbuf, cp, ep - cp);
1626 strbuf_addstr(&msgbuf, reset);
1627 }
1628
1629 if (ep < line + len) {
1630 strbuf_addstr(&msgbuf, func);
1631 strbuf_add(&msgbuf, ep, line + len - ep);
1632 strbuf_addstr(&msgbuf, reset);
1633 }
1634
1635 strbuf_add(&msgbuf, line + len, org_len - len);
1636 strbuf_complete_line(&msgbuf);
1637 emit_diff_symbol(ecbdata->opt,
1638 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1639 strbuf_release(&msgbuf);
1640 }
1641
1642 static struct diff_tempfile *claim_diff_tempfile(void) {
1643 int i;
1644 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1645 if (!diff_temp[i].name)
1646 return diff_temp + i;
1647 BUG("diff is failing to clean up its tempfiles");
1648 }
1649
1650 static void remove_tempfile(void)
1651 {
1652 int i;
1653 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1654 if (is_tempfile_active(diff_temp[i].tempfile))
1655 delete_tempfile(&diff_temp[i].tempfile);
1656 diff_temp[i].name = NULL;
1657 }
1658 }
1659
1660 static void add_line_count(struct strbuf *out, int count)
1661 {
1662 switch (count) {
1663 case 0:
1664 strbuf_addstr(out, "0,0");
1665 break;
1666 case 1:
1667 strbuf_addstr(out, "1");
1668 break;
1669 default:
1670 strbuf_addf(out, "1,%d", count);
1671 break;
1672 }
1673 }
1674
1675 static void emit_rewrite_lines(struct emit_callback *ecb,
1676 int prefix, const char *data, int size)
1677 {
1678 const char *endp = NULL;
1679 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1680
1681 while (0 < size) {
1682 int len;
1683
1684 endp = memchr(data, '\n', size);
1685 len = endp ? (endp - data + 1) : size;
1686 if (prefix != '+') {
1687 ecb->lno_in_preimage++;
1688 emit_del_line(reset, ecb, data, len);
1689 } else {
1690 ecb->lno_in_postimage++;
1691 emit_add_line(reset, ecb, data, len);
1692 }
1693 size -= len;
1694 data += len;
1695 }
1696 if (!endp)
1697 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1698 }
1699
1700 static void emit_rewrite_diff(const char *name_a,
1701 const char *name_b,
1702 struct diff_filespec *one,
1703 struct diff_filespec *two,
1704 struct userdiff_driver *textconv_one,
1705 struct userdiff_driver *textconv_two,
1706 struct diff_options *o)
1707 {
1708 int lc_a, lc_b;
1709 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1710 const char *a_prefix, *b_prefix;
1711 char *data_one, *data_two;
1712 size_t size_one, size_two;
1713 struct emit_callback ecbdata;
1714 struct strbuf out = STRBUF_INIT;
1715
1716 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1717 a_prefix = o->b_prefix;
1718 b_prefix = o->a_prefix;
1719 } else {
1720 a_prefix = o->a_prefix;
1721 b_prefix = o->b_prefix;
1722 }
1723
1724 name_a += (*name_a == '/');
1725 name_b += (*name_b == '/');
1726
1727 strbuf_reset(&a_name);
1728 strbuf_reset(&b_name);
1729 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1730 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1731
1732 size_one = fill_textconv(o->repo, textconv_one, one, &data_one);
1733 size_two = fill_textconv(o->repo, textconv_two, two, &data_two);
1734
1735 memset(&ecbdata, 0, sizeof(ecbdata));
1736 ecbdata.color_diff = want_color(o->use_color);
1737 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
1738 ecbdata.opt = o;
1739 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1740 mmfile_t mf1, mf2;
1741 mf1.ptr = (char *)data_one;
1742 mf2.ptr = (char *)data_two;
1743 mf1.size = size_one;
1744 mf2.size = size_two;
1745 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1746 }
1747 ecbdata.lno_in_preimage = 1;
1748 ecbdata.lno_in_postimage = 1;
1749
1750 lc_a = count_lines(data_one, size_one);
1751 lc_b = count_lines(data_two, size_two);
1752
1753 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1754 a_name.buf, a_name.len, 0);
1755 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1756 b_name.buf, b_name.len, 0);
1757
1758 strbuf_addstr(&out, "@@ -");
1759 if (!o->irreversible_delete)
1760 add_line_count(&out, lc_a);
1761 else
1762 strbuf_addstr(&out, "?,?");
1763 strbuf_addstr(&out, " +");
1764 add_line_count(&out, lc_b);
1765 strbuf_addstr(&out, " @@\n");
1766 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1767 strbuf_release(&out);
1768
1769 if (lc_a && !o->irreversible_delete)
1770 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1771 if (lc_b)
1772 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1773 if (textconv_one)
1774 free((char *)data_one);
1775 if (textconv_two)
1776 free((char *)data_two);
1777 }
1778
1779 struct diff_words_buffer {
1780 mmfile_t text;
1781 unsigned long alloc;
1782 struct diff_words_orig {
1783 const char *begin, *end;
1784 } *orig;
1785 int orig_nr, orig_alloc;
1786 };
1787
1788 static void diff_words_append(char *line, unsigned long len,
1789 struct diff_words_buffer *buffer)
1790 {
1791 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1792 line++;
1793 len--;
1794 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1795 buffer->text.size += len;
1796 buffer->text.ptr[buffer->text.size] = '\0';
1797 }
1798
1799 struct diff_words_style_elem {
1800 const char *prefix;
1801 const char *suffix;
1802 const char *color; /* NULL; filled in by the setup code if
1803 * color is enabled */
1804 };
1805
1806 struct diff_words_style {
1807 enum diff_words_type type;
1808 struct diff_words_style_elem new_word, old_word, ctx;
1809 const char *newline;
1810 };
1811
1812 static struct diff_words_style diff_words_styles[] = {
1813 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1814 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1815 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1816 };
1817
1818 struct diff_words_data {
1819 struct diff_words_buffer minus, plus;
1820 const char *current_plus;
1821 int last_minus;
1822 struct diff_options *opt;
1823 regex_t *word_regex;
1824 enum diff_words_type type;
1825 struct diff_words_style *style;
1826 };
1827
1828 static int fn_out_diff_words_write_helper(struct diff_options *o,
1829 struct diff_words_style_elem *st_el,
1830 const char *newline,
1831 size_t count, const char *buf)
1832 {
1833 int print = 0;
1834 struct strbuf sb = STRBUF_INIT;
1835
1836 while (count) {
1837 char *p = memchr(buf, '\n', count);
1838 if (print)
1839 strbuf_addstr(&sb, diff_line_prefix(o));
1840
1841 if (p != buf) {
1842 const char *reset = st_el->color && *st_el->color ?
1843 GIT_COLOR_RESET : NULL;
1844 if (st_el->color && *st_el->color)
1845 strbuf_addstr(&sb, st_el->color);
1846 strbuf_addstr(&sb, st_el->prefix);
1847 strbuf_add(&sb, buf, p ? p - buf : count);
1848 strbuf_addstr(&sb, st_el->suffix);
1849 if (reset)
1850 strbuf_addstr(&sb, reset);
1851 }
1852 if (!p)
1853 goto out;
1854
1855 strbuf_addstr(&sb, newline);
1856 count -= p + 1 - buf;
1857 buf = p + 1;
1858 print = 1;
1859 if (count) {
1860 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1861 sb.buf, sb.len, 0);
1862 strbuf_reset(&sb);
1863 }
1864 }
1865
1866 out:
1867 if (sb.len)
1868 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1869 sb.buf, sb.len, 0);
1870 strbuf_release(&sb);
1871 return 0;
1872 }
1873
1874 /*
1875 * '--color-words' algorithm can be described as:
1876 *
1877 * 1. collect the minus/plus lines of a diff hunk, divided into
1878 * minus-lines and plus-lines;
1879 *
1880 * 2. break both minus-lines and plus-lines into words and
1881 * place them into two mmfile_t with one word for each line;
1882 *
1883 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1884 *
1885 * And for the common parts of the both file, we output the plus side text.
1886 * diff_words->current_plus is used to trace the current position of the plus file
1887 * which printed. diff_words->last_minus is used to trace the last minus word
1888 * printed.
1889 *
1890 * For '--graph' to work with '--color-words', we need to output the graph prefix
1891 * on each line of color words output. Generally, there are two conditions on
1892 * which we should output the prefix.
1893 *
1894 * 1. diff_words->last_minus == 0 &&
1895 * diff_words->current_plus == diff_words->plus.text.ptr
1896 *
1897 * that is: the plus text must start as a new line, and if there is no minus
1898 * word printed, a graph prefix must be printed.
1899 *
1900 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1901 * *(diff_words->current_plus - 1) == '\n'
1902 *
1903 * that is: a graph prefix must be printed following a '\n'
1904 */
1905 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1906 {
1907 if ((diff_words->last_minus == 0 &&
1908 diff_words->current_plus == diff_words->plus.text.ptr) ||
1909 (diff_words->current_plus > diff_words->plus.text.ptr &&
1910 *(diff_words->current_plus - 1) == '\n')) {
1911 return 1;
1912 } else {
1913 return 0;
1914 }
1915 }
1916
1917 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1918 {
1919 struct diff_words_data *diff_words = priv;
1920 struct diff_words_style *style = diff_words->style;
1921 int minus_first, minus_len, plus_first, plus_len;
1922 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1923 struct diff_options *opt = diff_words->opt;
1924 const char *line_prefix;
1925
1926 if (line[0] != '@' || parse_hunk_header(line, len,
1927 &minus_first, &minus_len, &plus_first, &plus_len))
1928 return;
1929
1930 assert(opt);
1931 line_prefix = diff_line_prefix(opt);
1932
1933 /* POSIX requires that first be decremented by one if len == 0... */
1934 if (minus_len) {
1935 minus_begin = diff_words->minus.orig[minus_first].begin;
1936 minus_end =
1937 diff_words->minus.orig[minus_first + minus_len - 1].end;
1938 } else
1939 minus_begin = minus_end =
1940 diff_words->minus.orig[minus_first].end;
1941
1942 if (plus_len) {
1943 plus_begin = diff_words->plus.orig[plus_first].begin;
1944 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1945 } else
1946 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1947
1948 if (color_words_output_graph_prefix(diff_words)) {
1949 fputs(line_prefix, diff_words->opt->file);
1950 }
1951 if (diff_words->current_plus != plus_begin) {
1952 fn_out_diff_words_write_helper(diff_words->opt,
1953 &style->ctx, style->newline,
1954 plus_begin - diff_words->current_plus,
1955 diff_words->current_plus);
1956 }
1957 if (minus_begin != minus_end) {
1958 fn_out_diff_words_write_helper(diff_words->opt,
1959 &style->old_word, style->newline,
1960 minus_end - minus_begin, minus_begin);
1961 }
1962 if (plus_begin != plus_end) {
1963 fn_out_diff_words_write_helper(diff_words->opt,
1964 &style->new_word, style->newline,
1965 plus_end - plus_begin, plus_begin);
1966 }
1967
1968 diff_words->current_plus = plus_end;
1969 diff_words->last_minus = minus_first;
1970 }
1971
1972 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1973 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1974 int *begin, int *end)
1975 {
1976 if (word_regex && *begin < buffer->size) {
1977 regmatch_t match[1];
1978 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1979 buffer->size - *begin, 1, match, 0)) {
1980 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1981 '\n', match[0].rm_eo - match[0].rm_so);
1982 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1983 *begin += match[0].rm_so;
1984 return *begin >= *end;
1985 }
1986 return -1;
1987 }
1988
1989 /* find the next word */
1990 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1991 (*begin)++;
1992 if (*begin >= buffer->size)
1993 return -1;
1994
1995 /* find the end of the word */
1996 *end = *begin + 1;
1997 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1998 (*end)++;
1999
2000 return 0;
2001 }
2002
2003 /*
2004 * This function splits the words in buffer->text, stores the list with
2005 * newline separator into out, and saves the offsets of the original words
2006 * in buffer->orig.
2007 */
2008 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
2009 regex_t *word_regex)
2010 {
2011 int i, j;
2012 long alloc = 0;
2013
2014 out->size = 0;
2015 out->ptr = NULL;
2016
2017 /* fake an empty "0th" word */
2018 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2019 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2020 buffer->orig_nr = 1;
2021
2022 for (i = 0; i < buffer->text.size; i++) {
2023 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2024 return;
2025
2026 /* store original boundaries */
2027 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2028 buffer->orig_alloc);
2029 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2030 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2031 buffer->orig_nr++;
2032
2033 /* store one word */
2034 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2035 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2036 out->ptr[out->size + j - i] = '\n';
2037 out->size += j - i + 1;
2038
2039 i = j - 1;
2040 }
2041 }
2042
2043 /* this executes the word diff on the accumulated buffers */
2044 static void diff_words_show(struct diff_words_data *diff_words)
2045 {
2046 xpparam_t xpp;
2047 xdemitconf_t xecfg;
2048 mmfile_t minus, plus;
2049 struct diff_words_style *style = diff_words->style;
2050
2051 struct diff_options *opt = diff_words->opt;
2052 const char *line_prefix;
2053
2054 assert(opt);
2055 line_prefix = diff_line_prefix(opt);
2056
2057 /* special case: only removal */
2058 if (!diff_words->plus.text.size) {
2059 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2060 line_prefix, strlen(line_prefix), 0);
2061 fn_out_diff_words_write_helper(diff_words->opt,
2062 &style->old_word, style->newline,
2063 diff_words->minus.text.size,
2064 diff_words->minus.text.ptr);
2065 diff_words->minus.text.size = 0;
2066 return;
2067 }
2068
2069 diff_words->current_plus = diff_words->plus.text.ptr;
2070 diff_words->last_minus = 0;
2071
2072 memset(&xpp, 0, sizeof(xpp));
2073 memset(&xecfg, 0, sizeof(xecfg));
2074 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2075 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2076 xpp.flags = 0;
2077 /* as only the hunk header will be parsed, we need a 0-context */
2078 xecfg.ctxlen = 0;
2079 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
2080 &xpp, &xecfg))
2081 die("unable to generate word diff");
2082 free(minus.ptr);
2083 free(plus.ptr);
2084 if (diff_words->current_plus != diff_words->plus.text.ptr +
2085 diff_words->plus.text.size) {
2086 if (color_words_output_graph_prefix(diff_words))
2087 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2088 line_prefix, strlen(line_prefix), 0);
2089 fn_out_diff_words_write_helper(diff_words->opt,
2090 &style->ctx, style->newline,
2091 diff_words->plus.text.ptr + diff_words->plus.text.size
2092 - diff_words->current_plus, diff_words->current_plus);
2093 }
2094 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2095 }
2096
2097 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2098 static void diff_words_flush(struct emit_callback *ecbdata)
2099 {
2100 struct diff_options *wo = ecbdata->diff_words->opt;
2101
2102 if (ecbdata->diff_words->minus.text.size ||
2103 ecbdata->diff_words->plus.text.size)
2104 diff_words_show(ecbdata->diff_words);
2105
2106 if (wo->emitted_symbols) {
2107 struct diff_options *o = ecbdata->opt;
2108 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2109 int i;
2110
2111 /*
2112 * NEEDSWORK:
2113 * Instead of appending each, concat all words to a line?
2114 */
2115 for (i = 0; i < wol->nr; i++)
2116 append_emitted_diff_symbol(o, &wol->buf[i]);
2117
2118 for (i = 0; i < wol->nr; i++)
2119 free((void *)wol->buf[i].line);
2120
2121 wol->nr = 0;
2122 }
2123 }
2124
2125 static void diff_filespec_load_driver(struct diff_filespec *one,
2126 struct index_state *istate)
2127 {
2128 /* Use already-loaded driver */
2129 if (one->driver)
2130 return;
2131
2132 if (S_ISREG(one->mode))
2133 one->driver = userdiff_find_by_path(istate, one->path);
2134
2135 /* Fallback to default settings */
2136 if (!one->driver)
2137 one->driver = userdiff_find_by_name("default");
2138 }
2139
2140 static const char *userdiff_word_regex(struct diff_filespec *one,
2141 struct index_state *istate)
2142 {
2143 diff_filespec_load_driver(one, istate);
2144 return one->driver->word_regex;
2145 }
2146
2147 static void init_diff_words_data(struct emit_callback *ecbdata,
2148 struct diff_options *orig_opts,
2149 struct diff_filespec *one,
2150 struct diff_filespec *two)
2151 {
2152 int i;
2153 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2154 memcpy(o, orig_opts, sizeof(struct diff_options));
2155
2156 ecbdata->diff_words =
2157 xcalloc(1, sizeof(struct diff_words_data));
2158 ecbdata->diff_words->type = o->word_diff;
2159 ecbdata->diff_words->opt = o;
2160
2161 if (orig_opts->emitted_symbols)
2162 o->emitted_symbols =
2163 xcalloc(1, sizeof(struct emitted_diff_symbols));
2164
2165 if (!o->word_regex)
2166 o->word_regex = userdiff_word_regex(one, o->repo->index);
2167 if (!o->word_regex)
2168 o->word_regex = userdiff_word_regex(two, o->repo->index);
2169 if (!o->word_regex)
2170 o->word_regex = diff_word_regex_cfg;
2171 if (o->word_regex) {
2172 ecbdata->diff_words->word_regex = (regex_t *)
2173 xmalloc(sizeof(regex_t));
2174 if (regcomp(ecbdata->diff_words->word_regex,
2175 o->word_regex,
2176 REG_EXTENDED | REG_NEWLINE))
2177 die("invalid regular expression: %s",
2178 o->word_regex);
2179 }
2180 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2181 if (o->word_diff == diff_words_styles[i].type) {
2182 ecbdata->diff_words->style =
2183 &diff_words_styles[i];
2184 break;
2185 }
2186 }
2187 if (want_color(o->use_color)) {
2188 struct diff_words_style *st = ecbdata->diff_words->style;
2189 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2190 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2191 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2192 }
2193 }
2194
2195 static void free_diff_words_data(struct emit_callback *ecbdata)
2196 {
2197 if (ecbdata->diff_words) {
2198 diff_words_flush(ecbdata);
2199 free (ecbdata->diff_words->opt->emitted_symbols);
2200 free (ecbdata->diff_words->opt);
2201 free (ecbdata->diff_words->minus.text.ptr);
2202 free (ecbdata->diff_words->minus.orig);
2203 free (ecbdata->diff_words->plus.text.ptr);
2204 free (ecbdata->diff_words->plus.orig);
2205 if (ecbdata->diff_words->word_regex) {
2206 regfree(ecbdata->diff_words->word_regex);
2207 free(ecbdata->diff_words->word_regex);
2208 }
2209 FREE_AND_NULL(ecbdata->diff_words);
2210 }
2211 }
2212
2213 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2214 {
2215 if (want_color(diff_use_color))
2216 return diff_colors[ix];
2217 return "";
2218 }
2219
2220 const char *diff_line_prefix(struct diff_options *opt)
2221 {
2222 struct strbuf *msgbuf;
2223 if (!opt->output_prefix)
2224 return "";
2225
2226 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2227 return msgbuf->buf;
2228 }
2229
2230 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2231 {
2232 const char *cp;
2233 unsigned long allot;
2234 size_t l = len;
2235
2236 cp = line;
2237 allot = l;
2238 while (0 < l) {
2239 (void) utf8_width(&cp, &l);
2240 if (!cp)
2241 break; /* truncated in the middle? */
2242 }
2243 return allot - l;
2244 }
2245
2246 static void find_lno(const char *line, struct emit_callback *ecbdata)
2247 {
2248 const char *p;
2249 ecbdata->lno_in_preimage = 0;
2250 ecbdata->lno_in_postimage = 0;
2251 p = strchr(line, '-');
2252 if (!p)
2253 return; /* cannot happen */
2254 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2255 p = strchr(p, '+');
2256 if (!p)
2257 return; /* cannot happen */
2258 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2259 }
2260
2261 static void fn_out_consume(void *priv, char *line, unsigned long len)
2262 {
2263 struct emit_callback *ecbdata = priv;
2264 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2265 struct diff_options *o = ecbdata->opt;
2266
2267 o->found_changes = 1;
2268
2269 if (ecbdata->header) {
2270 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2271 ecbdata->header->buf, ecbdata->header->len, 0);
2272 strbuf_reset(ecbdata->header);
2273 ecbdata->header = NULL;
2274 }
2275
2276 if (ecbdata->label_path[0]) {
2277 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2278 ecbdata->label_path[0],
2279 strlen(ecbdata->label_path[0]), 0);
2280 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2281 ecbdata->label_path[1],
2282 strlen(ecbdata->label_path[1]), 0);
2283 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2284 }
2285
2286 if (diff_suppress_blank_empty
2287 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2288 line[0] = '\n';
2289 len = 1;
2290 }
2291
2292 if (line[0] == '@') {
2293 if (ecbdata->diff_words)
2294 diff_words_flush(ecbdata);
2295 len = sane_truncate_line(ecbdata, line, len);
2296 find_lno(line, ecbdata);
2297 emit_hunk_header(ecbdata, line, len);
2298 return;
2299 }
2300
2301 if (ecbdata->diff_words) {
2302 enum diff_symbol s =
2303 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2304 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2305 if (line[0] == '-') {
2306 diff_words_append(line, len,
2307 &ecbdata->diff_words->minus);
2308 return;
2309 } else if (line[0] == '+') {
2310 diff_words_append(line, len,
2311 &ecbdata->diff_words->plus);
2312 return;
2313 } else if (starts_with(line, "\\ ")) {
2314 /*
2315 * Eat the "no newline at eof" marker as if we
2316 * saw a "+" or "-" line with nothing on it,
2317 * and return without diff_words_flush() to
2318 * defer processing. If this is the end of
2319 * preimage, more "+" lines may come after it.
2320 */
2321 return;
2322 }
2323 diff_words_flush(ecbdata);
2324 emit_diff_symbol(o, s, line, len, 0);
2325 return;
2326 }
2327
2328 switch (line[0]) {
2329 case '+':
2330 ecbdata->lno_in_postimage++;
2331 emit_add_line(reset, ecbdata, line + 1, len - 1);
2332 break;
2333 case '-':
2334 ecbdata->lno_in_preimage++;
2335 emit_del_line(reset, ecbdata, line + 1, len - 1);
2336 break;
2337 case ' ':
2338 ecbdata->lno_in_postimage++;
2339 ecbdata->lno_in_preimage++;
2340 emit_context_line(reset, ecbdata, line + 1, len - 1);
2341 break;
2342 default:
2343 /* incomplete line at the end */
2344 ecbdata->lno_in_preimage++;
2345 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2346 line, len, 0);
2347 break;
2348 }
2349 }
2350
2351 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2352 {
2353 const char *old_name = a;
2354 const char *new_name = b;
2355 int pfx_length, sfx_length;
2356 int pfx_adjust_for_slash;
2357 int len_a = strlen(a);
2358 int len_b = strlen(b);
2359 int a_midlen, b_midlen;
2360 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2361 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2362
2363 if (qlen_a || qlen_b) {
2364 quote_c_style(a, name, NULL, 0);
2365 strbuf_addstr(name, " => ");
2366 quote_c_style(b, name, NULL, 0);
2367 return;
2368 }
2369
2370 /* Find common prefix */
2371 pfx_length = 0;
2372 while (*old_name && *new_name && *old_name == *new_name) {
2373 if (*old_name == '/')
2374 pfx_length = old_name - a + 1;
2375 old_name++;
2376 new_name++;
2377 }
2378
2379 /* Find common suffix */
2380 old_name = a + len_a;
2381 new_name = b + len_b;
2382 sfx_length = 0;
2383 /*
2384 * If there is a common prefix, it must end in a slash. In
2385 * that case we let this loop run 1 into the prefix to see the
2386 * same slash.
2387 *
2388 * If there is no common prefix, we cannot do this as it would
2389 * underrun the input strings.
2390 */
2391 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2392 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2393 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2394 *old_name == *new_name) {
2395 if (*old_name == '/')
2396 sfx_length = len_a - (old_name - a);
2397 old_name--;
2398 new_name--;
2399 }
2400
2401 /*
2402 * pfx{mid-a => mid-b}sfx
2403 * {pfx-a => pfx-b}sfx
2404 * pfx{sfx-a => sfx-b}
2405 * name-a => name-b
2406 */
2407 a_midlen = len_a - pfx_length - sfx_length;
2408 b_midlen = len_b - pfx_length - sfx_length;
2409 if (a_midlen < 0)
2410 a_midlen = 0;
2411 if (b_midlen < 0)
2412 b_midlen = 0;
2413
2414 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2415 if (pfx_length + sfx_length) {
2416 strbuf_add(name, a, pfx_length);
2417 strbuf_addch(name, '{');
2418 }
2419 strbuf_add(name, a + pfx_length, a_midlen);
2420 strbuf_addstr(name, " => ");
2421 strbuf_add(name, b + pfx_length, b_midlen);
2422 if (pfx_length + sfx_length) {
2423 strbuf_addch(name, '}');
2424 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2425 }
2426 }
2427
2428 struct diffstat_t {
2429 int nr;
2430 int alloc;
2431 struct diffstat_file {
2432 char *from_name;
2433 char *name;
2434 char *print_name;
2435 const char *comments;
2436 unsigned is_unmerged:1;
2437 unsigned is_binary:1;
2438 unsigned is_renamed:1;
2439 unsigned is_interesting:1;
2440 uintmax_t added, deleted;
2441 } **files;
2442 };
2443
2444 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2445 const char *name_a,
2446 const char *name_b)
2447 {
2448 struct diffstat_file *x;
2449 x = xcalloc(1, sizeof(*x));
2450 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2451 diffstat->files[diffstat->nr++] = x;
2452 if (name_b) {
2453 x->from_name = xstrdup(name_a);
2454 x->name = xstrdup(name_b);
2455 x->is_renamed = 1;
2456 }
2457 else {
2458 x->from_name = NULL;
2459 x->name = xstrdup(name_a);
2460 }
2461 return x;
2462 }
2463
2464 static void diffstat_consume(void *priv, char *line, unsigned long len)
2465 {
2466 struct diffstat_t *diffstat = priv;
2467 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2468
2469 if (line[0] == '+')
2470 x->added++;
2471 else if (line[0] == '-')
2472 x->deleted++;
2473 }
2474
2475 const char mime_boundary_leader[] = "------------";
2476
2477 static int scale_linear(int it, int width, int max_change)
2478 {
2479 if (!it)
2480 return 0;
2481 /*
2482 * make sure that at least one '-' or '+' is printed if
2483 * there is any change to this path. The easiest way is to
2484 * scale linearly as if the alloted width is one column shorter
2485 * than it is, and then add 1 to the result.
2486 */
2487 return 1 + (it * (width - 1) / max_change);
2488 }
2489
2490 static void show_graph(struct strbuf *out, char ch, int cnt,
2491 const char *set, const char *reset)
2492 {
2493 if (cnt <= 0)
2494 return;
2495 strbuf_addstr(out, set);
2496 strbuf_addchars(out, ch, cnt);
2497 strbuf_addstr(out, reset);
2498 }
2499
2500 static void fill_print_name(struct diffstat_file *file)
2501 {
2502 struct strbuf pname = STRBUF_INIT;
2503
2504 if (file->print_name)
2505 return;
2506
2507 if (file->is_renamed)
2508 pprint_rename(&pname, file->from_name, file->name);
2509 else
2510 quote_c_style(file->name, &pname, NULL, 0);
2511
2512 if (file->comments)
2513 strbuf_addf(&pname, " (%s)", file->comments);
2514
2515 file->print_name = strbuf_detach(&pname, NULL);
2516 }
2517
2518 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2519 int files, int insertions, int deletions)
2520 {
2521 struct strbuf sb = STRBUF_INIT;
2522
2523 if (!files) {
2524 assert(insertions == 0 && deletions == 0);
2525 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2526 NULL, 0, 0);
2527 return;
2528 }
2529
2530 strbuf_addf(&sb,
2531 (files == 1) ? " %d file changed" : " %d files changed",
2532 files);
2533
2534 /*
2535 * For binary diff, the caller may want to print "x files
2536 * changed" with insertions == 0 && deletions == 0.
2537 *
2538 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2539 * is probably less confusing (i.e skip over "2 files changed
2540 * but nothing about added/removed lines? Is this a bug in Git?").
2541 */
2542 if (insertions || deletions == 0) {
2543 strbuf_addf(&sb,
2544 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2545 insertions);
2546 }
2547
2548 if (deletions || insertions == 0) {
2549 strbuf_addf(&sb,
2550 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2551 deletions);
2552 }
2553 strbuf_addch(&sb, '\n');
2554 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2555 sb.buf, sb.len, 0);
2556 strbuf_release(&sb);
2557 }
2558
2559 void print_stat_summary(FILE *fp, int files,
2560 int insertions, int deletions)
2561 {
2562 struct diff_options o;
2563 memset(&o, 0, sizeof(o));
2564 o.file = fp;
2565
2566 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2567 }
2568
2569 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2570 {
2571 int i, len, add, del, adds = 0, dels = 0;
2572 uintmax_t max_change = 0, max_len = 0;
2573 int total_files = data->nr, count;
2574 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2575 const char *reset, *add_c, *del_c;
2576 int extra_shown = 0;
2577 const char *line_prefix = diff_line_prefix(options);
2578 struct strbuf out = STRBUF_INIT;
2579
2580 if (data->nr == 0)
2581 return;
2582
2583 count = options->stat_count ? options->stat_count : data->nr;
2584
2585 reset = diff_get_color_opt(options, DIFF_RESET);
2586 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2587 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2588
2589 /*
2590 * Find the longest filename and max number of changes
2591 */
2592 for (i = 0; (i < count) && (i < data->nr); i++) {
2593 struct diffstat_file *file = data->files[i];
2594 uintmax_t change = file->added + file->deleted;
2595
2596 if (!file->is_interesting && (change == 0)) {
2597 count++; /* not shown == room for one more */
2598 continue;
2599 }
2600 fill_print_name(file);
2601 len = strlen(file->print_name);
2602 if (max_len < len)
2603 max_len = len;
2604
2605 if (file->is_unmerged) {
2606 /* "Unmerged" is 8 characters */
2607 bin_width = bin_width < 8 ? 8 : bin_width;
2608 continue;
2609 }
2610 if (file->is_binary) {
2611 /* "Bin XXX -> YYY bytes" */
2612 int w = 14 + decimal_width(file->added)
2613 + decimal_width(file->deleted);
2614 bin_width = bin_width < w ? w : bin_width;
2615 /* Display change counts aligned with "Bin" */
2616 number_width = 3;
2617 continue;
2618 }
2619
2620 if (max_change < change)
2621 max_change = change;
2622 }
2623 count = i; /* where we can stop scanning in data->files[] */
2624
2625 /*
2626 * We have width = stat_width or term_columns() columns total.
2627 * We want a maximum of min(max_len, stat_name_width) for the name part.
2628 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2629 * We also need 1 for " " and 4 + decimal_width(max_change)
2630 * for " | NNNN " and one the empty column at the end, altogether
2631 * 6 + decimal_width(max_change).
2632 *
2633 * If there's not enough space, we will use the smaller of
2634 * stat_name_width (if set) and 5/8*width for the filename,
2635 * and the rest for constant elements + graph part, but no more
2636 * than stat_graph_width for the graph part.
2637 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2638 * for the standard terminal size).
2639 *
2640 * In other words: stat_width limits the maximum width, and
2641 * stat_name_width fixes the maximum width of the filename,
2642 * and is also used to divide available columns if there
2643 * aren't enough.
2644 *
2645 * Binary files are displayed with "Bin XXX -> YYY bytes"
2646 * instead of the change count and graph. This part is treated
2647 * similarly to the graph part, except that it is not
2648 * "scaled". If total width is too small to accommodate the
2649 * guaranteed minimum width of the filename part and the
2650 * separators and this message, this message will "overflow"
2651 * making the line longer than the maximum width.
2652 */
2653
2654 if (options->stat_width == -1)
2655 width = term_columns() - strlen(line_prefix);
2656 else
2657 width = options->stat_width ? options->stat_width : 80;
2658 number_width = decimal_width(max_change) > number_width ?
2659 decimal_width(max_change) : number_width;
2660
2661 if (options->stat_graph_width == -1)
2662 options->stat_graph_width = diff_stat_graph_width;
2663
2664 /*
2665 * Guarantee 3/8*16==6 for the graph part
2666 * and 5/8*16==10 for the filename part
2667 */
2668 if (width < 16 + 6 + number_width)
2669 width = 16 + 6 + number_width;
2670
2671 /*
2672 * First assign sizes that are wanted, ignoring available width.
2673 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2674 * starting from "XXX" should fit in graph_width.
2675 */
2676 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2677 if (options->stat_graph_width &&
2678 options->stat_graph_width < graph_width)
2679 graph_width = options->stat_graph_width;
2680
2681 name_width = (options->stat_name_width > 0 &&
2682 options->stat_name_width < max_len) ?
2683 options->stat_name_width : max_len;
2684
2685 /*
2686 * Adjust adjustable widths not to exceed maximum width
2687 */
2688 if (name_width + number_width + 6 + graph_width > width) {
2689 if (graph_width > width * 3/8 - number_width - 6) {
2690 graph_width = width * 3/8 - number_width - 6;
2691 if (graph_width < 6)
2692 graph_width = 6;
2693 }
2694
2695 if (options->stat_graph_width &&
2696 graph_width > options->stat_graph_width)
2697 graph_width = options->stat_graph_width;
2698 if (name_width > width - number_width - 6 - graph_width)
2699 name_width = width - number_width - 6 - graph_width;
2700 else
2701 graph_width = width - number_width - 6 - name_width;
2702 }
2703
2704 /*
2705 * From here name_width is the width of the name area,
2706 * and graph_width is the width of the graph area.
2707 * max_change is used to scale graph properly.
2708 */
2709 for (i = 0; i < count; i++) {
2710 const char *prefix = "";
2711 struct diffstat_file *file = data->files[i];
2712 char *name = file->print_name;
2713 uintmax_t added = file->added;
2714 uintmax_t deleted = file->deleted;
2715 int name_len;
2716
2717 if (!file->is_interesting && (added + deleted == 0))
2718 continue;
2719
2720 /*
2721 * "scale" the filename
2722 */
2723 len = name_width;
2724 name_len = strlen(name);
2725 if (name_width < name_len) {
2726 char *slash;
2727 prefix = "...";
2728 len -= 3;
2729 name += name_len - len;
2730 slash = strchr(name, '/');
2731 if (slash)
2732 name = slash;
2733 }
2734
2735 if (file->is_binary) {
2736 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2737 strbuf_addf(&out, " %*s", number_width, "Bin");
2738 if (!added && !deleted) {
2739 strbuf_addch(&out, '\n');
2740 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2741 out.buf, out.len, 0);
2742 strbuf_reset(&out);
2743 continue;
2744 }
2745 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2746 del_c, deleted, reset);
2747 strbuf_addstr(&out, " -> ");
2748 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2749 add_c, added, reset);
2750 strbuf_addstr(&out, " bytes\n");
2751 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2752 out.buf, out.len, 0);
2753 strbuf_reset(&out);
2754 continue;
2755 }
2756 else if (file->is_unmerged) {
2757 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2758 strbuf_addstr(&out, " Unmerged\n");
2759 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2760 out.buf, out.len, 0);
2761 strbuf_reset(&out);
2762 continue;
2763 }
2764
2765 /*
2766 * scale the add/delete
2767 */
2768 add = added;
2769 del = deleted;
2770
2771 if (graph_width <= max_change) {
2772 int total = scale_linear(add + del, graph_width, max_change);
2773 if (total < 2 && add && del)
2774 /* width >= 2 due to the sanity check */
2775 total = 2;
2776 if (add < del) {
2777 add = scale_linear(add, graph_width, max_change);
2778 del = total - add;
2779 } else {
2780 del = scale_linear(del, graph_width, max_change);
2781 add = total - del;
2782 }
2783 }
2784 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2785 strbuf_addf(&out, " %*"PRIuMAX"%s",
2786 number_width, added + deleted,
2787 added + deleted ? " " : "");
2788 show_graph(&out, '+', add, add_c, reset);
2789 show_graph(&out, '-', del, del_c, reset);
2790 strbuf_addch(&out, '\n');
2791 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2792 out.buf, out.len, 0);
2793 strbuf_reset(&out);
2794 }
2795
2796 for (i = 0; i < data->nr; i++) {
2797 struct diffstat_file *file = data->files[i];
2798 uintmax_t added = file->added;
2799 uintmax_t deleted = file->deleted;
2800
2801 if (file->is_unmerged ||
2802 (!file->is_interesting && (added + deleted == 0))) {
2803 total_files--;
2804 continue;
2805 }
2806
2807 if (!file->is_binary) {
2808 adds += added;
2809 dels += deleted;
2810 }
2811 if (i < count)
2812 continue;
2813 if (!extra_shown)
2814 emit_diff_symbol(options,
2815 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2816 NULL, 0, 0);
2817 extra_shown = 1;
2818 }
2819
2820 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2821 strbuf_release(&out);
2822 }
2823
2824 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2825 {
2826 int i, adds = 0, dels = 0, total_files = data->nr;
2827
2828 if (data->nr == 0)
2829 return;
2830
2831 for (i = 0; i < data->nr; i++) {
2832 int added = data->files[i]->added;
2833 int deleted = data->files[i]->deleted;
2834
2835 if (data->files[i]->is_unmerged ||
2836 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2837 total_files--;
2838 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2839 adds += added;
2840 dels += deleted;
2841 }
2842 }
2843 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2844 }
2845
2846 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2847 {
2848 int i;
2849
2850 if (data->nr == 0)
2851 return;
2852
2853 for (i = 0; i < data->nr; i++) {
2854 struct diffstat_file *file = data->files[i];
2855
2856 fprintf(options->file, "%s", diff_line_prefix(options));
2857
2858 if (file->is_binary)
2859 fprintf(options->file, "-\t-\t");
2860 else
2861 fprintf(options->file,
2862 "%"PRIuMAX"\t%"PRIuMAX"\t",
2863 file->added, file->deleted);
2864 if (options->line_termination) {
2865 fill_print_name(file);
2866 if (!file->is_renamed)
2867 write_name_quoted(file->name, options->file,
2868 options->line_termination);
2869 else {
2870 fputs(file->print_name, options->file);
2871 putc(options->line_termination, options->file);
2872 }
2873 } else {
2874 if (file->is_renamed) {
2875 putc('\0', options->file);
2876 write_name_quoted(file->from_name, options->file, '\0');
2877 }
2878 write_name_quoted(file->name, options->file, '\0');
2879 }
2880 }
2881 }
2882
2883 struct dirstat_file {
2884 const char *name;
2885 unsigned long changed;
2886 };
2887
2888 struct dirstat_dir {
2889 struct dirstat_file *files;
2890 int alloc, nr, permille, cumulative;
2891 };
2892
2893 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2894 unsigned long changed, const char *base, int baselen)
2895 {
2896 unsigned long sum_changes = 0;
2897 unsigned int sources = 0;
2898 const char *line_prefix = diff_line_prefix(opt);
2899
2900 while (dir->nr) {
2901 struct dirstat_file *f = dir->files;
2902 int namelen = strlen(f->name);
2903 unsigned long changes;
2904 char *slash;
2905
2906 if (namelen < baselen)
2907 break;
2908 if (memcmp(f->name, base, baselen))
2909 break;
2910 slash = strchr(f->name + baselen, '/');
2911 if (slash) {
2912 int newbaselen = slash + 1 - f->name;
2913 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2914 sources++;
2915 } else {
2916 changes = f->changed;
2917 dir->files++;
2918 dir->nr--;
2919 sources += 2;
2920 }
2921 sum_changes += changes;
2922 }
2923
2924 /*
2925 * We don't report dirstat's for
2926 * - the top level
2927 * - or cases where everything came from a single directory
2928 * under this directory (sources == 1).
2929 */
2930 if (baselen && sources != 1) {
2931 if (sum_changes) {
2932 int permille = sum_changes * 1000 / changed;
2933 if (permille >= dir->permille) {
2934 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2935 permille / 10, permille % 10, baselen, base);
2936 if (!dir->cumulative)
2937 return 0;
2938 }
2939 }
2940 }
2941 return sum_changes;
2942 }
2943
2944 static int dirstat_compare(const void *_a, const void *_b)
2945 {
2946 const struct dirstat_file *a = _a;
2947 const struct dirstat_file *b = _b;
2948 return strcmp(a->name, b->name);
2949 }
2950
2951 static void show_dirstat(struct diff_options *options)
2952 {
2953 int i;
2954 unsigned long changed;
2955 struct dirstat_dir dir;
2956 struct diff_queue_struct *q = &diff_queued_diff;
2957
2958 dir.files = NULL;
2959 dir.alloc = 0;
2960 dir.nr = 0;
2961 dir.permille = options->dirstat_permille;
2962 dir.cumulative = options->flags.dirstat_cumulative;
2963
2964 changed = 0;
2965 for (i = 0; i < q->nr; i++) {
2966 struct diff_filepair *p = q->queue[i];
2967 const char *name;
2968 unsigned long copied, added, damage;
2969
2970 name = p->two->path ? p->two->path : p->one->path;
2971
2972 if (p->one->oid_valid && p->two->oid_valid &&
2973 oideq(&p->one->oid, &p->two->oid)) {
2974 /*
2975 * The SHA1 has not changed, so pre-/post-content is
2976 * identical. We can therefore skip looking at the
2977 * file contents altogether.
2978 */
2979 damage = 0;
2980 goto found_damage;
2981 }
2982
2983 if (options->flags.dirstat_by_file) {
2984 /*
2985 * In --dirstat-by-file mode, we don't really need to
2986 * look at the actual file contents at all.
2987 * The fact that the SHA1 changed is enough for us to
2988 * add this file to the list of results
2989 * (with each file contributing equal damage).
2990 */
2991 damage = 1;
2992 goto found_damage;
2993 }
2994
2995 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2996 diff_populate_filespec(options->repo, p->one, 0);
2997 diff_populate_filespec(options->repo, p->two, 0);
2998 diffcore_count_changes(options->repo,
2999 p->one, p->two, NULL, NULL,
3000 &copied, &added);
3001 diff_free_filespec_data(p->one);
3002 diff_free_filespec_data(p->two);
3003 } else if (DIFF_FILE_VALID(p->one)) {
3004 diff_populate_filespec(options->repo, p->one, CHECK_SIZE_ONLY);
3005 copied = added = 0;
3006 diff_free_filespec_data(p->one);
3007 } else if (DIFF_FILE_VALID(p->two)) {
3008 diff_populate_filespec(options->repo, p->two, CHECK_SIZE_ONLY);
3009 copied = 0;
3010 added = p->two->size;
3011 diff_free_filespec_data(p->two);
3012 } else
3013 continue;
3014
3015 /*
3016 * Original minus copied is the removed material,
3017 * added is the new material. They are both damages
3018 * made to the preimage.
3019 * If the resulting damage is zero, we know that
3020 * diffcore_count_changes() considers the two entries to
3021 * be identical, but since the oid changed, we
3022 * know that there must have been _some_ kind of change,
3023 * so we force all entries to have damage > 0.
3024 */
3025 damage = (p->one->size - copied) + added;
3026 if (!damage)
3027 damage = 1;
3028
3029 found_damage:
3030 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3031 dir.files[dir.nr].name = name;
3032 dir.files[dir.nr].changed = damage;
3033 changed += damage;
3034 dir.nr++;
3035 }
3036
3037 /* This can happen even with many files, if everything was renames */
3038 if (!changed)
3039 return;
3040
3041 /* Show all directories with more than x% of the changes */
3042 QSORT(dir.files, dir.nr, dirstat_compare);
3043 gather_dirstat(options, &dir, changed, "", 0);
3044 }
3045
3046 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3047 {
3048 int i;
3049 unsigned long changed;
3050 struct dirstat_dir dir;
3051
3052 if (data->nr == 0)
3053 return;
3054
3055 dir.files = NULL;
3056 dir.alloc = 0;
3057 dir.nr = 0;
3058 dir.permille = options->dirstat_permille;
3059 dir.cumulative = options->flags.dirstat_cumulative;
3060
3061 changed = 0;
3062 for (i = 0; i < data->nr; i++) {
3063 struct diffstat_file *file = data->files[i];
3064 unsigned long damage = file->added + file->deleted;
3065 if (file->is_binary)
3066 /*
3067 * binary files counts bytes, not lines. Must find some
3068 * way to normalize binary bytes vs. textual lines.
3069 * The following heuristic assumes that there are 64
3070 * bytes per "line".
3071 * This is stupid and ugly, but very cheap...
3072 */
3073 damage = DIV_ROUND_UP(damage, 64);
3074 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3075 dir.files[dir.nr].name = file->name;
3076 dir.files[dir.nr].changed = damage;
3077 changed += damage;
3078 dir.nr++;
3079 }
3080
3081 /* This can happen even with many files, if everything was renames */
3082 if (!changed)
3083 return;
3084
3085 /* Show all directories with more than x% of the changes */
3086 QSORT(dir.files, dir.nr, dirstat_compare);
3087 gather_dirstat(options, &dir, changed, "", 0);
3088 }
3089
3090 static void free_diffstat_info(struct diffstat_t *diffstat)
3091 {
3092 int i;
3093 for (i = 0; i < diffstat->nr; i++) {
3094 struct diffstat_file *f = diffstat->files[i];
3095 free(f->print_name);
3096 free(f->name);
3097 free(f->from_name);
3098 free(f);
3099 }
3100 free(diffstat->files);
3101 }
3102
3103 struct checkdiff_t {
3104 const char *filename;
3105 int lineno;
3106 int conflict_marker_size;
3107 struct diff_options *o;
3108 unsigned ws_rule;
3109 unsigned status;
3110 };
3111
3112 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3113 {
3114 char firstchar;
3115 int cnt;
3116
3117 if (len < marker_size + 1)
3118 return 0;
3119 firstchar = line[0];
3120 switch (firstchar) {
3121 case '=': case '>': case '<': case '|':
3122 break;
3123 default:
3124 return 0;
3125 }
3126 for (cnt = 1; cnt < marker_size; cnt++)
3127 if (line[cnt] != firstchar)
3128 return 0;
3129 /* line[1] thru line[marker_size-1] are same as firstchar */
3130 if (len < marker_size + 1 || !isspace(line[marker_size]))
3131 return 0;
3132 return 1;
3133 }
3134
3135 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3136 {
3137 struct checkdiff_t *data = priv;
3138 int marker_size = data->conflict_marker_size;
3139 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3140 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3141 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3142 char *err;
3143 const char *line_prefix;
3144
3145 assert(data->o);
3146 line_prefix = diff_line_prefix(data->o);
3147
3148 if (line[0] == '+') {
3149 unsigned bad;
3150 data->lineno++;
3151 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3152 data->status |= 1;
3153 fprintf(data->o->file,
3154 "%s%s:%d: leftover conflict marker\n",
3155 line_prefix, data->filename, data->lineno);
3156 }
3157 bad = ws_check(line + 1, len - 1, data->ws_rule);
3158 if (!bad)
3159 return;
3160 data->status |= bad;
3161 err = whitespace_error_string(bad);
3162 fprintf(data->o->file, "%s%s:%d: %s.\n",
3163 line_prefix, data->filename, data->lineno, err);
3164 free(err);
3165 emit_line(data->o, set, reset, line, 1);
3166 ws_check_emit(line + 1, len - 1, data->ws_rule,
3167 data->o->file, set, reset, ws);
3168 } else if (line[0] == ' ') {
3169 data->lineno++;
3170 } else if (line[0] == '@') {
3171 char *plus = strchr(line, '+');
3172 if (plus)
3173 data->lineno = strtol(plus, NULL, 10) - 1;
3174 else
3175 die("invalid diff");
3176 }
3177 }
3178
3179 static unsigned char *deflate_it(char *data,
3180 unsigned long size,
3181 unsigned long *result_size)
3182 {
3183 int bound;
3184 unsigned char *deflated;
3185 git_zstream stream;
3186
3187 git_deflate_init(&stream, zlib_compression_level);
3188 bound = git_deflate_bound(&stream, size);
3189 deflated = xmalloc(bound);
3190 stream.next_out = deflated;
3191 stream.avail_out = bound;
3192
3193 stream.next_in = (unsigned char *)data;
3194 stream.avail_in = size;
3195 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3196 ; /* nothing */
3197 git_deflate_end(&stream);
3198 *result_size = stream.total_out;
3199 return deflated;
3200 }
3201
3202 static void emit_binary_diff_body(struct diff_options *o,
3203 mmfile_t *one, mmfile_t *two)
3204 {
3205 void *cp;
3206 void *delta;
3207 void *deflated;
3208 void *data;
3209 unsigned long orig_size;
3210 unsigned long delta_size;
3211 unsigned long deflate_size;
3212 unsigned long data_size;
3213
3214 /* We could do deflated delta, or we could do just deflated two,
3215 * whichever is smaller.
3216 */
3217 delta = NULL;
3218 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3219 if (one->size && two->size) {
3220 delta = diff_delta(one->ptr, one->size,
3221 two->ptr, two->size,
3222 &delta_size, deflate_size);
3223 if (delta) {
3224 void *to_free = delta;
3225 orig_size = delta_size;
3226 delta = deflate_it(delta, delta_size, &delta_size);
3227 free(to_free);
3228 }
3229 }
3230
3231 if (delta && delta_size < deflate_size) {
3232 char *s = xstrfmt("%lu", orig_size);
3233 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3234 s, strlen(s), 0);
3235 free(s);
3236 free(deflated);
3237 data = delta;
3238 data_size = delta_size;
3239 } else {
3240 char *s = xstrfmt("%lu", two->size);
3241 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3242 s, strlen(s), 0);
3243 free(s);
3244 free(delta);
3245 data = deflated;
3246 data_size = deflate_size;
3247 }
3248
3249 /* emit data encoded in base85 */
3250 cp = data;
3251 while (data_size) {
3252 int len;
3253 int bytes = (52 < data_size) ? 52 : data_size;
3254 char line[71];
3255 data_size -= bytes;
3256 if (bytes <= 26)
3257 line[0] = bytes + 'A' - 1;
3258 else
3259 line[0] = bytes - 26 + 'a' - 1;
3260 encode_85(line + 1, cp, bytes);
3261 cp = (char *) cp + bytes;
3262
3263 len = strlen(line);
3264 line[len++] = '\n';
3265 line[len] = '\0';
3266
3267 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3268 line, len, 0);
3269 }
3270 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3271 free(data);
3272 }
3273
3274 static void emit_binary_diff(struct diff_options *o,
3275 mmfile_t *one, mmfile_t *two)
3276 {
3277 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3278 emit_binary_diff_body(o, one, two);
3279 emit_binary_diff_body(o, two, one);
3280 }
3281
3282 int diff_filespec_is_binary(struct repository *r,
3283 struct diff_filespec *one)
3284 {
3285 if (one->is_binary == -1) {
3286 diff_filespec_load_driver(one, r->index);
3287 if (one->driver->binary != -1)
3288 one->is_binary = one->driver->binary;
3289 else {
3290 if (!one->data && DIFF_FILE_VALID(one))
3291 diff_populate_filespec(r, one, CHECK_BINARY);
3292 if (one->is_binary == -1 && one->data)
3293 one->is_binary = buffer_is_binary(one->data,
3294 one->size);
3295 if (one->is_binary == -1)
3296 one->is_binary = 0;
3297 }
3298 }
3299 return one->is_binary;
3300 }
3301
3302 static const struct userdiff_funcname *
3303 diff_funcname_pattern(struct diff_options *o, struct diff_filespec *one)
3304 {
3305 diff_filespec_load_driver(one, o->repo->index);
3306 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3307 }
3308
3309 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3310 {
3311 if (!options->a_prefix)
3312 options->a_prefix = a;
3313 if (!options->b_prefix)
3314 options->b_prefix = b;
3315 }
3316
3317 struct userdiff_driver *get_textconv(struct index_state *istate,
3318 struct diff_filespec *one)
3319 {
3320 if (!DIFF_FILE_VALID(one))
3321 return NULL;
3322
3323 diff_filespec_load_driver(one, istate);
3324 return userdiff_get_textconv(one->driver);
3325 }
3326
3327 static void builtin_diff(const char *name_a,
3328 const char *name_b,
3329 struct diff_filespec *one,
3330 struct diff_filespec *two,
3331 const char *xfrm_msg,
3332 int must_show_header,
3333 struct diff_options *o,
3334 int complete_rewrite)
3335 {
3336 mmfile_t mf1, mf2;
3337 const char *lbl[2];
3338 char *a_one, *b_two;
3339 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3340 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3341 const char *a_prefix, *b_prefix;
3342 struct userdiff_driver *textconv_one = NULL;
3343 struct userdiff_driver *textconv_two = NULL;
3344 struct strbuf header = STRBUF_INIT;
3345 const char *line_prefix = diff_line_prefix(o);
3346
3347 diff_set_mnemonic_prefix(o, "a/", "b/");
3348 if (o->flags.reverse_diff) {
3349 a_prefix = o->b_prefix;
3350 b_prefix = o->a_prefix;
3351 } else {
3352 a_prefix = o->a_prefix;
3353 b_prefix = o->b_prefix;
3354 }
3355
3356 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3357 (!one->mode || S_ISGITLINK(one->mode)) &&
3358 (!two->mode || S_ISGITLINK(two->mode))) {
3359 show_submodule_summary(o, one->path ? one->path : two->path,
3360 &one->oid, &two->oid,
3361 two->dirty_submodule);
3362 return;
3363 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3364 (!one->mode || S_ISGITLINK(one->mode)) &&
3365 (!two->mode || S_ISGITLINK(two->mode))) {
3366 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3367 &one->oid, &two->oid,
3368 two->dirty_submodule);
3369 return;
3370 }
3371
3372 if (o->flags.allow_textconv) {
3373 textconv_one = get_textconv(o->repo->index, one);
3374 textconv_two = get_textconv(o->repo->index, two);
3375 }
3376
3377 /* Never use a non-valid filename anywhere if at all possible */
3378 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3379 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3380
3381 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3382 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3383 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3384 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3385 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3386 if (lbl[0][0] == '/') {
3387 /* /dev/null */
3388 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3389 if (xfrm_msg)
3390 strbuf_addstr(&header, xfrm_msg);
3391 must_show_header = 1;
3392 }
3393 else if (lbl[1][0] == '/') {
3394 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3395 if (xfrm_msg)
3396 strbuf_addstr(&header, xfrm_msg);
3397 must_show_header = 1;
3398 }
3399 else {
3400 if (one->mode != two->mode) {
3401 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3402 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3403 must_show_header = 1;
3404 }
3405 if (xfrm_msg)
3406 strbuf_addstr(&header, xfrm_msg);
3407
3408 /*
3409 * we do not run diff between different kind
3410 * of objects.
3411 */
3412 if ((one->mode ^ two->mode) & S_IFMT)
3413 goto free_ab_and_return;
3414 if (complete_rewrite &&
3415 (textconv_one || !diff_filespec_is_binary(o->repo, one)) &&
3416 (textconv_two || !diff_filespec_is_binary(o->repo, two))) {
3417 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3418 header.buf, header.len, 0);
3419 strbuf_reset(&header);
3420 emit_rewrite_diff(name_a, name_b, one, two,
3421 textconv_one, textconv_two, o);
3422 o->found_changes = 1;
3423 goto free_ab_and_return;
3424 }
3425 }
3426
3427 if (o->irreversible_delete && lbl[1][0] == '/') {
3428 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3429 header.len, 0);
3430 strbuf_reset(&header);
3431 goto free_ab_and_return;
3432 } else if (!o->flags.text &&
3433 ( (!textconv_one && diff_filespec_is_binary(o->repo, one)) ||
3434 (!textconv_two && diff_filespec_is_binary(o->repo, two)) )) {
3435 struct strbuf sb = STRBUF_INIT;
3436 if (!one->data && !two->data &&
3437 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3438 !o->flags.binary) {
3439 if (oideq(&one->oid, &two->oid)) {
3440 if (must_show_header)
3441 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3442 header.buf, header.len,
3443 0);
3444 goto free_ab_and_return;
3445 }
3446 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3447 header.buf, header.len, 0);
3448 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3449 diff_line_prefix(o), lbl[0], lbl[1]);
3450 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3451 sb.buf, sb.len, 0);
3452 strbuf_release(&sb);
3453 goto free_ab_and_return;
3454 }
3455 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3456 fill_mmfile(o->repo, &mf2, two) < 0)
3457 die("unable to read files to diff");
3458 /* Quite common confusing case */
3459 if (mf1.size == mf2.size &&
3460 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3461 if (must_show_header)
3462 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3463 header.buf, header.len, 0);
3464 goto free_ab_and_return;
3465 }
3466 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3467 strbuf_reset(&header);
3468 if (o->flags.binary)
3469 emit_binary_diff(o, &mf1, &mf2);
3470 else {
3471 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3472 diff_line_prefix(o), lbl[0], lbl[1]);
3473 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3474 sb.buf, sb.len, 0);
3475 strbuf_release(&sb);
3476 }
3477 o->found_changes = 1;
3478 } else {
3479 /* Crazy xdl interfaces.. */
3480 const char *diffopts = getenv("GIT_DIFF_OPTS");
3481 const char *v;
3482 xpparam_t xpp;
3483 xdemitconf_t xecfg;
3484 struct emit_callback ecbdata;
3485 const struct userdiff_funcname *pe;
3486
3487 if (must_show_header) {
3488 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3489 header.buf, header.len, 0);
3490 strbuf_reset(&header);
3491 }
3492
3493 mf1.size = fill_textconv(o->repo, textconv_one, one, &mf1.ptr);
3494 mf2.size = fill_textconv(o->repo, textconv_two, two, &mf2.ptr);
3495
3496 pe = diff_funcname_pattern(o, one);
3497 if (!pe)
3498 pe = diff_funcname_pattern(o, two);
3499
3500 memset(&xpp, 0, sizeof(xpp));
3501 memset(&xecfg, 0, sizeof(xecfg));
3502 memset(&ecbdata, 0, sizeof(ecbdata));
3503 if (o->flags.suppress_diff_headers)
3504 lbl[0] = NULL;
3505 ecbdata.label_path = lbl;
3506 ecbdata.color_diff = want_color(o->use_color);
3507 ecbdata.ws_rule = whitespace_rule(o->repo->index, name_b);
3508 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3509 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3510 ecbdata.opt = o;
3511 if (header.len && !o->flags.suppress_diff_headers)
3512 ecbdata.header = &header;
3513 xpp.flags = o->xdl_opts;
3514 xpp.anchors = o->anchors;
3515 xpp.anchors_nr = o->anchors_nr;
3516 xecfg.ctxlen = o->context;
3517 xecfg.interhunkctxlen = o->interhunkcontext;
3518 xecfg.flags = XDL_EMIT_FUNCNAMES;
3519 if (o->flags.funccontext)
3520 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3521 if (pe)
3522 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3523 if (!diffopts)
3524 ;
3525 else if (skip_prefix(diffopts, "--unified=", &v))
3526 xecfg.ctxlen = strtoul(v, NULL, 10);
3527 else if (skip_prefix(diffopts, "-u", &v))
3528 xecfg.ctxlen = strtoul(v, NULL, 10);
3529 if (o->word_diff)
3530 init_diff_words_data(&ecbdata, o, one, two);
3531 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3532 &xpp, &xecfg))
3533 die("unable to generate diff for %s", one->path);
3534 if (o->word_diff)
3535 free_diff_words_data(&ecbdata);
3536 if (textconv_one)
3537 free(mf1.ptr);
3538 if (textconv_two)
3539 free(mf2.ptr);
3540 xdiff_clear_find_func(&xecfg);
3541 }
3542
3543 free_ab_and_return:
3544 strbuf_release(&header);
3545 diff_free_filespec_data(one);
3546 diff_free_filespec_data(two);
3547 free(a_one);
3548 free(b_two);
3549 return;
3550 }
3551
3552 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3553 {
3554 if (!is_renamed) {
3555 if (p->status == DIFF_STATUS_ADDED) {
3556 if (S_ISLNK(p->two->mode))
3557 return "new +l";
3558 else if ((p->two->mode & 0777) == 0755)
3559 return "new +x";
3560 else
3561 return "new";
3562 } else if (p->status == DIFF_STATUS_DELETED)
3563 return "gone";
3564 }
3565 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3566 return "mode -l";
3567 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3568 return "mode +l";
3569 else if ((p->one->mode & 0777) == 0644 &&
3570 (p->two->mode & 0777) == 0755)
3571 return "mode +x";
3572 else if ((p->one->mode & 0777) == 0755 &&
3573 (p->two->mode & 0777) == 0644)
3574 return "mode -x";
3575 return NULL;
3576 }
3577
3578 static void builtin_diffstat(const char *name_a, const char *name_b,
3579 struct diff_filespec *one,
3580 struct diff_filespec *two,
3581 struct diffstat_t *diffstat,
3582 struct diff_options *o,
3583 struct diff_filepair *p)
3584 {
3585 mmfile_t mf1, mf2;
3586 struct diffstat_file *data;
3587 int same_contents;
3588 int complete_rewrite = 0;
3589
3590 if (!DIFF_PAIR_UNMERGED(p)) {
3591 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3592 complete_rewrite = 1;
3593 }
3594
3595 data = diffstat_add(diffstat, name_a, name_b);
3596 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3597 if (o->flags.stat_with_summary)
3598 data->comments = get_compact_summary(p, data->is_renamed);
3599
3600 if (!one || !two) {
3601 data->is_unmerged = 1;
3602 return;
3603 }
3604
3605 same_contents = oideq(&one->oid, &two->oid);
3606
3607 if (diff_filespec_is_binary(o->repo, one) ||
3608 diff_filespec_is_binary(o->repo, two)) {
3609 data->is_binary = 1;
3610 if (same_contents) {
3611 data->added = 0;
3612 data->deleted = 0;
3613 } else {
3614 data->added = diff_filespec_size(o->repo, two);
3615 data->deleted = diff_filespec_size(o->repo, one);
3616 }
3617 }
3618
3619 else if (complete_rewrite) {
3620 diff_populate_filespec(o->repo, one, 0);
3621 diff_populate_filespec(o->repo, two, 0);
3622 data->deleted = count_lines(one->data, one->size);
3623 data->added = count_lines(two->data, two->size);
3624 }
3625
3626 else if (!same_contents) {
3627 /* Crazy xdl interfaces.. */
3628 xpparam_t xpp;
3629 xdemitconf_t xecfg;
3630
3631 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3632 fill_mmfile(o->repo, &mf2, two) < 0)
3633 die("unable to read files to diff");
3634
3635 memset(&xpp, 0, sizeof(xpp));
3636 memset(&xecfg, 0, sizeof(xecfg));
3637 xpp.flags = o->xdl_opts;
3638 xpp.anchors = o->anchors;
3639 xpp.anchors_nr = o->anchors_nr;
3640 xecfg.ctxlen = o->context;
3641 xecfg.interhunkctxlen = o->interhunkcontext;
3642 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3643 &xpp, &xecfg))
3644 die("unable to generate diffstat for %s", one->path);
3645 }
3646
3647 diff_free_filespec_data(one);
3648 diff_free_filespec_data(two);
3649 }
3650
3651 static void builtin_checkdiff(const char *name_a, const char *name_b,
3652 const char *attr_path,
3653 struct diff_filespec *one,
3654 struct diff_filespec *two,
3655 struct diff_options *o)
3656 {
3657 mmfile_t mf1, mf2;
3658 struct checkdiff_t data;
3659
3660 if (!two)
3661 return;
3662
3663 memset(&data, 0, sizeof(data));
3664 data.filename = name_b ? name_b : name_a;
3665 data.lineno = 0;
3666 data.o = o;
3667 data.ws_rule = whitespace_rule(o->repo->index, attr_path);
3668 data.conflict_marker_size = ll_merge_marker_size(o->repo->index, attr_path);
3669
3670 if (fill_mmfile(o->repo, &mf1, one) < 0 ||
3671 fill_mmfile(o->repo, &mf2, two) < 0)
3672 die("unable to read files to diff");
3673
3674 /*
3675 * All the other codepaths check both sides, but not checking
3676 * the "old" side here is deliberate. We are checking the newly
3677 * introduced changes, and as long as the "new" side is text, we
3678 * can and should check what it introduces.
3679 */
3680 if (diff_filespec_is_binary(o->repo, two))
3681 goto free_and_return;
3682 else {
3683 /* Crazy xdl interfaces.. */
3684 xpparam_t xpp;
3685 xdemitconf_t xecfg;
3686
3687 memset(&xpp, 0, sizeof(xpp));
3688 memset(&xecfg, 0, sizeof(xecfg));
3689 xecfg.ctxlen = 1; /* at least one context line */
3690 xpp.flags = 0;
3691 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3692 &xpp, &xecfg))
3693 die("unable to generate checkdiff for %s", one->path);
3694
3695 if (data.ws_rule & WS_BLANK_AT_EOF) {
3696 struct emit_callback ecbdata;
3697 int blank_at_eof;
3698
3699 ecbdata.ws_rule = data.ws_rule;
3700 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3701 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3702
3703 if (blank_at_eof) {
3704 static char *err;
3705 if (!err)
3706 err = whitespace_error_string(WS_BLANK_AT_EOF);
3707 fprintf(o->file, "%s:%d: %s.\n",
3708 data.filename, blank_at_eof, err);
3709 data.status = 1; /* report errors */
3710 }
3711 }
3712 }
3713 free_and_return:
3714 diff_free_filespec_data(one);
3715 diff_free_filespec_data(two);
3716 if (data.status)
3717 o->flags.check_failed = 1;
3718 }
3719
3720 struct diff_filespec *alloc_filespec(const char *path)
3721 {
3722 struct diff_filespec *spec;
3723
3724 FLEXPTR_ALLOC_STR(spec, path, path);
3725 spec->count = 1;
3726 spec->is_binary = -1;
3727 return spec;
3728 }
3729
3730 void free_filespec(struct diff_filespec *spec)
3731 {
3732 if (!--spec->count) {
3733 diff_free_filespec_data(spec);
3734 free(spec);
3735 }
3736 }
3737
3738 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3739 int oid_valid, unsigned short mode)
3740 {
3741 if (mode) {
3742 spec->mode = canon_mode(mode);
3743 oidcpy(&spec->oid, oid);
3744 spec->oid_valid = oid_valid;
3745 }
3746 }
3747
3748 /*
3749 * Given a name and sha1 pair, if the index tells us the file in
3750 * the work tree has that object contents, return true, so that
3751 * prepare_temp_file() does not have to inflate and extract.
3752 */
3753 static int reuse_worktree_file(struct index_state *istate,
3754 const char *name,
3755 const struct object_id *oid,
3756 int want_file)
3757 {
3758 const struct cache_entry *ce;
3759 struct stat st;
3760 int pos, len;
3761
3762 /*
3763 * We do not read the cache ourselves here, because the
3764 * benchmark with my previous version that always reads cache
3765 * shows that it makes things worse for diff-tree comparing
3766 * two linux-2.6 kernel trees in an already checked out work
3767 * tree. This is because most diff-tree comparisons deal with
3768 * only a small number of files, while reading the cache is
3769 * expensive for a large project, and its cost outweighs the
3770 * savings we get by not inflating the object to a temporary
3771 * file. Practically, this code only helps when we are used
3772 * by diff-cache --cached, which does read the cache before
3773 * calling us.
3774 */
3775 if (!istate->cache)
3776 return 0;
3777
3778 /* We want to avoid the working directory if our caller
3779 * doesn't need the data in a normal file, this system
3780 * is rather slow with its stat/open/mmap/close syscalls,
3781 * and the object is contained in a pack file. The pack
3782 * is probably already open and will be faster to obtain
3783 * the data through than the working directory. Loose
3784 * objects however would tend to be slower as they need
3785 * to be individually opened and inflated.
3786 */
3787 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3788 return 0;
3789
3790 /*
3791 * Similarly, if we'd have to convert the file contents anyway, that
3792 * makes the optimization not worthwhile.
3793 */
3794 if (!want_file && would_convert_to_git(istate, name))
3795 return 0;
3796
3797 len = strlen(name);
3798 pos = index_name_pos(istate, name, len);
3799 if (pos < 0)
3800 return 0;
3801 ce = istate->cache[pos];
3802
3803 /*
3804 * This is not the sha1 we are looking for, or
3805 * unreusable because it is not a regular file.
3806 */
3807 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3808 return 0;
3809
3810 /*
3811 * If ce is marked as "assume unchanged", there is no
3812 * guarantee that work tree matches what we are looking for.
3813 */
3814 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3815 return 0;
3816
3817 /*
3818 * If ce matches the file in the work tree, we can reuse it.
3819 */
3820 if (ce_uptodate(ce) ||
3821 (!lstat(name, &st) && !ie_match_stat(istate, ce, &st, 0)))
3822 return 1;
3823
3824 return 0;
3825 }
3826
3827 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3828 {
3829 struct strbuf buf = STRBUF_INIT;
3830 char *dirty = "";
3831
3832 /* Are we looking at the work tree? */
3833 if (s->dirty_submodule)
3834 dirty = "-dirty";
3835
3836 strbuf_addf(&buf, "Subproject commit %s%s\n",
3837 oid_to_hex(&s->oid), dirty);
3838 s->size = buf.len;
3839 if (size_only) {
3840 s->data = NULL;
3841 strbuf_release(&buf);
3842 } else {
3843 s->data = strbuf_detach(&buf, NULL);
3844 s->should_free = 1;
3845 }
3846 return 0;
3847 }
3848
3849 /*
3850 * While doing rename detection and pickaxe operation, we may need to
3851 * grab the data for the blob (or file) for our own in-core comparison.
3852 * diff_filespec has data and size fields for this purpose.
3853 */
3854 int diff_populate_filespec(struct repository *r,
3855 struct diff_filespec *s,
3856 unsigned int flags)
3857 {
3858 int size_only = flags & CHECK_SIZE_ONLY;
3859 int err = 0;
3860 int conv_flags = global_conv_flags_eol;
3861 /*
3862 * demote FAIL to WARN to allow inspecting the situation
3863 * instead of refusing.
3864 */
3865 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3866 conv_flags = CONV_EOL_RNDTRP_WARN;
3867
3868 if (!DIFF_FILE_VALID(s))
3869 die("internal error: asking to populate invalid file.");
3870 if (S_ISDIR(s->mode))
3871 return -1;
3872
3873 if (s->data)
3874 return 0;
3875
3876 if (size_only && 0 < s->size)
3877 return 0;
3878
3879 if (S_ISGITLINK(s->mode))
3880 return diff_populate_gitlink(s, size_only);
3881
3882 if (!s->oid_valid ||
3883 reuse_worktree_file(r->index, s->path, &s->oid, 0)) {
3884 struct strbuf buf = STRBUF_INIT;
3885 struct stat st;
3886 int fd;
3887
3888 if (lstat(s->path, &st) < 0) {
3889 err_empty:
3890 err = -1;
3891 empty:
3892 s->data = (char *)"";
3893 s->size = 0;
3894 return err;
3895 }
3896 s->size = xsize_t(st.st_size);
3897 if (!s->size)
3898 goto empty;
3899 if (S_ISLNK(st.st_mode)) {
3900 struct strbuf sb = STRBUF_INIT;
3901
3902 if (strbuf_readlink(&sb, s->path, s->size))
3903 goto err_empty;
3904 s->size = sb.len;
3905 s->data = strbuf_detach(&sb, NULL);
3906 s->should_free = 1;
3907 return 0;
3908 }
3909
3910 /*
3911 * Even if the caller would be happy with getting
3912 * only the size, we cannot return early at this
3913 * point if the path requires us to run the content
3914 * conversion.
3915 */
3916 if (size_only && !would_convert_to_git(r->index, s->path))
3917 return 0;
3918
3919 /*
3920 * Note: this check uses xsize_t(st.st_size) that may
3921 * not be the true size of the blob after it goes
3922 * through convert_to_git(). This may not strictly be
3923 * correct, but the whole point of big_file_threshold
3924 * and is_binary check being that we want to avoid
3925 * opening the file and inspecting the contents, this
3926 * is probably fine.
3927 */
3928 if ((flags & CHECK_BINARY) &&
3929 s->size > big_file_threshold && s->is_binary == -1) {
3930 s->is_binary = 1;
3931 return 0;
3932 }
3933 fd = open(s->path, O_RDONLY);
3934 if (fd < 0)
3935 goto err_empty;
3936 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3937 close(fd);
3938 s->should_munmap = 1;
3939
3940 /*
3941 * Convert from working tree format to canonical git format
3942 */
3943 if (convert_to_git(r->index, s->path, s->data, s->size, &buf, conv_flags)) {
3944 size_t size = 0;
3945 munmap(s->data, s->size);
3946 s->should_munmap = 0;
3947 s->data = strbuf_detach(&buf, &size);
3948 s->size = size;
3949 s->should_free = 1;
3950 }
3951 }
3952 else {
3953 enum object_type type;
3954 if (size_only || (flags & CHECK_BINARY)) {
3955 type = oid_object_info(r, &s->oid, &s->size);
3956 if (type < 0)
3957 die("unable to read %s",
3958 oid_to_hex(&s->oid));
3959 if (size_only)
3960 return 0;
3961 if (s->size > big_file_threshold && s->is_binary == -1) {
3962 s->is_binary = 1;
3963 return 0;
3964 }
3965 }
3966 s->data = read_object_file(&s->oid, &type, &s->size);
3967 if (!s->data)
3968 die("unable to read %s", oid_to_hex(&s->oid));
3969 s->should_free = 1;
3970 }
3971 return 0;
3972 }
3973
3974 void diff_free_filespec_blob(struct diff_filespec *s)
3975 {
3976 if (s->should_free)
3977 free(s->data);
3978 else if (s->should_munmap)
3979 munmap(s->data, s->size);
3980
3981 if (s->should_free || s->should_munmap) {
3982 s->should_free = s->should_munmap = 0;
3983 s->data = NULL;
3984 }
3985 }
3986
3987 void diff_free_filespec_data(struct diff_filespec *s)
3988 {
3989 diff_free_filespec_blob(s);
3990 FREE_AND_NULL(s->cnt_data);
3991 }
3992
3993 static void prep_temp_blob(struct index_state *istate,
3994 const char *path, struct diff_tempfile *temp,
3995 void *blob,
3996 unsigned long size,
3997 const struct object_id *oid,
3998 int mode)
3999 {
4000 struct strbuf buf = STRBUF_INIT;
4001 struct strbuf tempfile = STRBUF_INIT;
4002 char *path_dup = xstrdup(path);
4003 const char *base = basename(path_dup);
4004
4005 /* Generate "XXXXXX_basename.ext" */
4006 strbuf_addstr(&tempfile, "XXXXXX_");
4007 strbuf_addstr(&tempfile, base);
4008
4009 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
4010 if (!temp->tempfile)
4011 die_errno("unable to create temp-file");
4012 if (convert_to_working_tree(istate, path,
4013 (const char *)blob, (size_t)size, &buf)) {
4014 blob = buf.buf;
4015 size = buf.len;
4016 }
4017 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
4018 close_tempfile_gently(temp->tempfile))
4019 die_errno("unable to write temp-file");
4020 temp->name = get_tempfile_path(temp->tempfile);
4021 oid_to_hex_r(temp->hex, oid);
4022 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
4023 strbuf_release(&buf);
4024 strbuf_release(&tempfile);
4025 free(path_dup);
4026 }
4027
4028 static struct diff_tempfile *prepare_temp_file(struct repository *r,
4029 const char *name,
4030 struct diff_filespec *one)
4031 {
4032 struct diff_tempfile *temp = claim_diff_tempfile();
4033
4034 if (!DIFF_FILE_VALID(one)) {
4035 not_a_valid_file:
4036 /* A '-' entry produces this for file-2, and
4037 * a '+' entry produces this for file-1.
4038 */
4039 temp->name = "/dev/null";
4040 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4041 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4042 return temp;
4043 }
4044
4045 if (!S_ISGITLINK(one->mode) &&
4046 (!one->oid_valid ||
4047 reuse_worktree_file(r->index, name, &one->oid, 1))) {
4048 struct stat st;
4049 if (lstat(name, &st) < 0) {
4050 if (errno == ENOENT)
4051 goto not_a_valid_file;
4052 die_errno("stat(%s)", name);
4053 }
4054 if (S_ISLNK(st.st_mode)) {
4055 struct strbuf sb = STRBUF_INIT;
4056 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4057 die_errno("readlink(%s)", name);
4058 prep_temp_blob(r->index, name, temp, sb.buf, sb.len,
4059 (one->oid_valid ?
4060 &one->oid : &null_oid),
4061 (one->oid_valid ?
4062 one->mode : S_IFLNK));
4063 strbuf_release(&sb);
4064 }
4065 else {
4066 /* we can borrow from the file in the work tree */
4067 temp->name = name;
4068 if (!one->oid_valid)
4069 oid_to_hex_r(temp->hex, &null_oid);
4070 else
4071 oid_to_hex_r(temp->hex, &one->oid);
4072 /* Even though we may sometimes borrow the
4073 * contents from the work tree, we always want
4074 * one->mode. mode is trustworthy even when
4075 * !(one->oid_valid), as long as
4076 * DIFF_FILE_VALID(one).
4077 */
4078 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4079 }
4080 return temp;
4081 }
4082 else {
4083 if (diff_populate_filespec(r, one, 0))
4084 die("cannot read data blob for %s", one->path);
4085 prep_temp_blob(r->index, name, temp,
4086 one->data, one->size,
4087 &one->oid, one->mode);
4088 }
4089 return temp;
4090 }
4091
4092 static void add_external_diff_name(struct repository *r,
4093 struct argv_array *argv,
4094 const char *name,
4095 struct diff_filespec *df)
4096 {
4097 struct diff_tempfile *temp = prepare_temp_file(r, name, df);
4098 argv_array_push(argv, temp->name);
4099 argv_array_push(argv, temp->hex);
4100 argv_array_push(argv, temp->mode);
4101 }
4102
4103 /* An external diff command takes:
4104 *
4105 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4106 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4107 *
4108 */
4109 static void run_external_diff(const char *pgm,
4110 const char *name,
4111 const char *other,
4112 struct diff_filespec *one,
4113 struct diff_filespec *two,
4114 const char *xfrm_msg,
4115 int complete_rewrite,
4116 struct diff_options *o)
4117 {
4118 struct argv_array argv = ARGV_ARRAY_INIT;
4119 struct argv_array env = ARGV_ARRAY_INIT;
4120 struct diff_queue_struct *q = &diff_queued_diff;
4121
4122 argv_array_push(&argv, pgm);
4123 argv_array_push(&argv, name);
4124
4125 if (one && two) {
4126 add_external_diff_name(o->repo, &argv, name, one);
4127 if (!other)
4128 add_external_diff_name(o->repo, &argv, name, two);
4129 else {
4130 add_external_diff_name(o->repo, &argv, other, two);
4131 argv_array_push(&argv, other);
4132 argv_array_push(&argv, xfrm_msg);
4133 }
4134 }
4135
4136 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4137 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4138
4139 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4140 die(_("external diff died, stopping at %s"), name);
4141
4142 remove_tempfile();
4143 argv_array_clear(&argv);
4144 argv_array_clear(&env);
4145 }
4146
4147 static int similarity_index(struct diff_filepair *p)
4148 {
4149 return p->score * 100 / MAX_SCORE;
4150 }
4151
4152 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4153 {
4154 if (startup_info->have_repository)
4155 return find_unique_abbrev(oid, abbrev);
4156 else {
4157 char *hex = oid_to_hex(oid);
4158 if (abbrev < 0)
4159 abbrev = FALLBACK_DEFAULT_ABBREV;
4160 if (abbrev > the_hash_algo->hexsz)
4161 BUG("oid abbreviation out of range: %d", abbrev);
4162 if (abbrev)
4163 hex[abbrev] = '\0';
4164 return hex;
4165 }
4166 }
4167
4168 static void fill_metainfo(struct strbuf *msg,
4169 const char *name,
4170 const char *other,
4171 struct diff_filespec *one,
4172 struct diff_filespec *two,
4173 struct diff_options *o,
4174 struct diff_filepair *p,
4175 int *must_show_header,
4176 int use_color)
4177 {
4178 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4179 const char *reset = diff_get_color(use_color, DIFF_RESET);
4180 const char *line_prefix = diff_line_prefix(o);
4181
4182 *must_show_header = 1;
4183 strbuf_init(msg, PATH_MAX * 2 + 300);
4184 switch (p->status) {
4185 case DIFF_STATUS_COPIED:
4186 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4187 line_prefix, set, similarity_index(p));
4188 strbuf_addf(msg, "%s\n%s%scopy from ",
4189 reset, line_prefix, set);
4190 quote_c_style(name, msg, NULL, 0);
4191 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4192 quote_c_style(other, msg, NULL, 0);
4193 strbuf_addf(msg, "%s\n", reset);
4194 break;
4195 case DIFF_STATUS_RENAMED:
4196 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4197 line_prefix, set, similarity_index(p));
4198 strbuf_addf(msg, "%s\n%s%srename from ",
4199 reset, line_prefix, set);
4200 quote_c_style(name, msg, NULL, 0);
4201 strbuf_addf(msg, "%s\n%s%srename to ",
4202 reset, line_prefix, set);
4203 quote_c_style(other, msg, NULL, 0);
4204 strbuf_addf(msg, "%s\n", reset);
4205 break;
4206 case DIFF_STATUS_MODIFIED:
4207 if (p->score) {
4208 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4209 line_prefix,
4210 set, similarity_index(p), reset);
4211 break;
4212 }
4213 /* fallthru */
4214 default:
4215 *must_show_header = 0;
4216 }
4217 if (one && two && !oideq(&one->oid, &two->oid)) {
4218 const unsigned hexsz = the_hash_algo->hexsz;
4219 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4220
4221 if (o->flags.binary) {
4222 mmfile_t mf;
4223 if ((!fill_mmfile(o->repo, &mf, one) &&
4224 diff_filespec_is_binary(o->repo, one)) ||
4225 (!fill_mmfile(o->repo, &mf, two) &&
4226 diff_filespec_is_binary(o->repo, two)))
4227 abbrev = hexsz;
4228 }
4229 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4230 diff_abbrev_oid(&one->oid, abbrev),
4231 diff_abbrev_oid(&two->oid, abbrev));
4232 if (one->mode == two->mode)
4233 strbuf_addf(msg, " %06o", one->mode);
4234 strbuf_addf(msg, "%s\n", reset);
4235 }
4236 }
4237
4238 static void run_diff_cmd(const char *pgm,
4239 const char *name,
4240 const char *other,
4241 const char *attr_path,
4242 struct diff_filespec *one,
4243 struct diff_filespec *two,
4244 struct strbuf *msg,
4245 struct diff_options *o,
4246 struct diff_filepair *p)
4247 {
4248 const char *xfrm_msg = NULL;
4249 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4250 int must_show_header = 0;
4251
4252
4253 if (o->flags.allow_external) {
4254 struct userdiff_driver *drv;
4255
4256 drv = userdiff_find_by_path(o->repo->index, attr_path);
4257 if (drv && drv->external)
4258 pgm = drv->external;
4259 }
4260
4261 if (msg) {
4262 /*
4263 * don't use colors when the header is intended for an
4264 * external diff driver
4265 */
4266 fill_metainfo(msg, name, other, one, two, o, p,
4267 &must_show_header,
4268 want_color(o->use_color) && !pgm);
4269 xfrm_msg = msg->len ? msg->buf : NULL;
4270 }
4271
4272 if (pgm) {
4273 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4274 complete_rewrite, o);
4275 return;
4276 }
4277 if (one && two)
4278 builtin_diff(name, other ? other : name,
4279 one, two, xfrm_msg, must_show_header,
4280 o, complete_rewrite);
4281 else
4282 fprintf(o->file, "* Unmerged path %s\n", name);
4283 }
4284
4285 static void diff_fill_oid_info(struct diff_filespec *one, struct index_state *istate)
4286 {
4287 if (DIFF_FILE_VALID(one)) {
4288 if (!one->oid_valid) {
4289 struct stat st;
4290 if (one->is_stdin) {
4291 oidclr(&one->oid);
4292 return;
4293 }
4294 if (lstat(one->path, &st) < 0)
4295 die_errno("stat '%s'", one->path);
4296 if (index_path(istate, &one->oid, one->path, &st, 0))
4297 die("cannot hash %s", one->path);
4298 }
4299 }
4300 else
4301 oidclr(&one->oid);
4302 }
4303
4304 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4305 {
4306 /* Strip the prefix but do not molest /dev/null and absolute paths */
4307 if (*namep && **namep != '/') {
4308 *namep += prefix_length;
4309 if (**namep == '/')
4310 ++*namep;
4311 }
4312 if (*otherp && **otherp != '/') {
4313 *otherp += prefix_length;
4314 if (**otherp == '/')
4315 ++*otherp;
4316 }
4317 }
4318
4319 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4320 {
4321 const char *pgm = external_diff();
4322 struct strbuf msg;
4323 struct diff_filespec *one = p->one;
4324 struct diff_filespec *two = p->two;
4325 const char *name;
4326 const char *other;
4327 const char *attr_path;
4328
4329 name = one->path;
4330 other = (strcmp(name, two->path) ? two->path : NULL);
4331 attr_path = name;
4332 if (o->prefix_length)
4333 strip_prefix(o->prefix_length, &name, &other);
4334
4335 if (!o->flags.allow_external)
4336 pgm = NULL;
4337
4338 if (DIFF_PAIR_UNMERGED(p)) {
4339 run_diff_cmd(pgm, name, NULL, attr_path,
4340 NULL, NULL, NULL, o, p);
4341 return;
4342 }
4343
4344 diff_fill_oid_info(one, o->repo->index);
4345 diff_fill_oid_info(two, o->repo->index);
4346
4347 if (!pgm &&
4348 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4349 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4350 /*
4351 * a filepair that changes between file and symlink
4352 * needs to be split into deletion and creation.
4353 */
4354 struct diff_filespec *null = alloc_filespec(two->path);
4355 run_diff_cmd(NULL, name, other, attr_path,
4356 one, null, &msg,
4357 o, p);
4358 free(null);
4359 strbuf_release(&msg);
4360
4361 null = alloc_filespec(one->path);
4362 run_diff_cmd(NULL, name, other, attr_path,
4363 null, two, &msg, o, p);
4364 free(null);
4365 }
4366 else
4367 run_diff_cmd(pgm, name, other, attr_path,
4368 one, two, &msg, o, p);
4369
4370 strbuf_release(&msg);
4371 }
4372
4373 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4374 struct diffstat_t *diffstat)
4375 {
4376 const char *name;
4377 const char *other;
4378
4379 if (DIFF_PAIR_UNMERGED(p)) {
4380 /* unmerged */
4381 builtin_diffstat(p->one->path, NULL, NULL, NULL,
4382 diffstat, o, p);
4383 return;
4384 }
4385
4386 name = p->one->path;
4387 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4388
4389 if (o->prefix_length)
4390 strip_prefix(o->prefix_length, &name, &other);
4391
4392 diff_fill_oid_info(p->one, o->repo->index);
4393 diff_fill_oid_info(p->two, o->repo->index);
4394
4395 builtin_diffstat(name, other, p->one, p->two,
4396 diffstat, o, p);
4397 }
4398
4399 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4400 {
4401 const char *name;
4402 const char *other;
4403 const char *attr_path;
4404
4405 if (DIFF_PAIR_UNMERGED(p)) {
4406 /* unmerged */
4407 return;
4408 }
4409
4410 name = p->one->path;
4411 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4412 attr_path = other ? other : name;
4413
4414 if (o->prefix_length)
4415 strip_prefix(o->prefix_length, &name, &other);
4416
4417 diff_fill_oid_info(p->one, o->repo->index);
4418 diff_fill_oid_info(p->two, o->repo->index);
4419
4420 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4421 }
4422
4423 void repo_diff_setup(struct repository *r, struct diff_options *options)
4424 {
4425 memcpy(options, &default_diff_options, sizeof(*options));
4426
4427 options->file = stdout;
4428 options->repo = r;
4429
4430 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4431 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4432 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4433 options->abbrev = DEFAULT_ABBREV;
4434 options->line_termination = '\n';
4435 options->break_opt = -1;
4436 options->rename_limit = -1;
4437 options->dirstat_permille = diff_dirstat_permille_default;
4438 options->context = diff_context_default;
4439 options->interhunkcontext = diff_interhunk_context_default;
4440 options->ws_error_highlight = ws_error_highlight_default;
4441 options->flags.rename_empty = 1;
4442 options->objfind = NULL;
4443
4444 /* pathchange left =NULL by default */
4445 options->change = diff_change;
4446 options->add_remove = diff_addremove;
4447 options->use_color = diff_use_color_default;
4448 options->detect_rename = diff_detect_rename_default;
4449 options->xdl_opts |= diff_algorithm;
4450 if (diff_indent_heuristic)
4451 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4452
4453 options->orderfile = diff_order_file_cfg;
4454
4455 if (diff_no_prefix) {
4456 options->a_prefix = options->b_prefix = "";
4457 } else if (!diff_mnemonic_prefix) {
4458 options->a_prefix = "a/";
4459 options->b_prefix = "b/";
4460 }
4461
4462 options->color_moved = diff_color_moved_default;
4463 options->color_moved_ws_handling = diff_color_moved_ws_default;
4464 }
4465
4466 void diff_setup_done(struct diff_options *options)
4467 {
4468 unsigned check_mask = DIFF_FORMAT_NAME |
4469 DIFF_FORMAT_NAME_STATUS |
4470 DIFF_FORMAT_CHECKDIFF |
4471 DIFF_FORMAT_NO_OUTPUT;
4472 /*
4473 * This must be signed because we're comparing against a potentially
4474 * negative value.
4475 */
4476 const int hexsz = the_hash_algo->hexsz;
4477
4478 if (options->set_default)
4479 options->set_default(options);
4480
4481 if (HAS_MULTI_BITS(options->output_format & check_mask))
4482 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4483
4484 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4485 die(_("-G, -S and --find-object are mutually exclusive"));
4486
4487 /*
4488 * Most of the time we can say "there are changes"
4489 * only by checking if there are changed paths, but
4490 * --ignore-whitespace* options force us to look
4491 * inside contents.
4492 */
4493
4494 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4495 options->flags.diff_from_contents = 1;
4496 else
4497 options->flags.diff_from_contents = 0;
4498
4499 if (options->flags.find_copies_harder)
4500 options->detect_rename = DIFF_DETECT_COPY;
4501
4502 if (!options->flags.relative_name)
4503 options->prefix = NULL;
4504 if (options->prefix)
4505 options->prefix_length = strlen(options->prefix);
4506 else
4507 options->prefix_length = 0;
4508
4509 if (options->output_format & (DIFF_FORMAT_NAME |
4510 DIFF_FORMAT_NAME_STATUS |
4511 DIFF_FORMAT_CHECKDIFF |
4512 DIFF_FORMAT_NO_OUTPUT))
4513 options->output_format &= ~(DIFF_FORMAT_RAW |
4514 DIFF_FORMAT_NUMSTAT |
4515 DIFF_FORMAT_DIFFSTAT |
4516 DIFF_FORMAT_SHORTSTAT |
4517 DIFF_FORMAT_DIRSTAT |
4518 DIFF_FORMAT_SUMMARY |
4519 DIFF_FORMAT_PATCH);
4520
4521 /*
4522 * These cases always need recursive; we do not drop caller-supplied
4523 * recursive bits for other formats here.
4524 */
4525 if (options->output_format & (DIFF_FORMAT_PATCH |
4526 DIFF_FORMAT_NUMSTAT |
4527 DIFF_FORMAT_DIFFSTAT |
4528 DIFF_FORMAT_SHORTSTAT |
4529 DIFF_FORMAT_DIRSTAT |
4530 DIFF_FORMAT_SUMMARY |
4531 DIFF_FORMAT_CHECKDIFF))
4532 options->flags.recursive = 1;
4533 /*
4534 * Also pickaxe would not work very well if you do not say recursive
4535 */
4536 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4537 options->flags.recursive = 1;
4538 /*
4539 * When patches are generated, submodules diffed against the work tree
4540 * must be checked for dirtiness too so it can be shown in the output
4541 */
4542 if (options->output_format & DIFF_FORMAT_PATCH)
4543 options->flags.dirty_submodules = 1;
4544
4545 if (options->detect_rename && options->rename_limit < 0)
4546 options->rename_limit = diff_rename_limit_default;
4547 if (hexsz < options->abbrev)
4548 options->abbrev = hexsz; /* full */
4549
4550 /*
4551 * It does not make sense to show the first hit we happened
4552 * to have found. It does not make sense not to return with
4553 * exit code in such a case either.
4554 */
4555 if (options->flags.quick) {
4556 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4557 options->flags.exit_with_status = 1;
4558 }
4559
4560 options->diff_path_counter = 0;
4561
4562 if (options->flags.follow_renames && options->pathspec.nr != 1)
4563 die(_("--follow requires exactly one pathspec"));
4564
4565 if (!options->use_color || external_diff())
4566 options->color_moved = 0;
4567 }
4568
4569 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4570 {
4571 char c, *eq;
4572 int len;
4573
4574 if (*arg != '-')
4575 return 0;
4576 c = *++arg;
4577 if (!c)
4578 return 0;
4579 if (c == arg_short) {
4580 c = *++arg;
4581 if (!c)
4582 return 1;
4583 if (val && isdigit(c)) {
4584 char *end;
4585 int n = strtoul(arg, &end, 10);
4586 if (*end)
4587 return 0;
4588 *val = n;
4589 return 1;
4590 }
4591 return 0;
4592 }
4593 if (c != '-')
4594 return 0;
4595 arg++;
4596 eq = strchrnul(arg, '=');
4597 len = eq - arg;
4598 if (!len || strncmp(arg, arg_long, len))
4599 return 0;
4600 if (*eq) {
4601 int n;
4602 char *end;
4603 if (!isdigit(*++eq))
4604 return 0;
4605 n = strtoul(eq, &end, 10);
4606 if (*end)
4607 return 0;
4608 *val = n;
4609 }
4610 return 1;
4611 }
4612
4613 static int diff_scoreopt_parse(const char *opt);
4614
4615 static inline int short_opt(char opt, const char **argv,
4616 const char **optarg)
4617 {
4618 const char *arg = argv[0];
4619 if (arg[0] != '-' || arg[1] != opt)
4620 return 0;
4621 if (arg[2] != '\0') {
4622 *optarg = arg + 2;
4623 return 1;
4624 }
4625 if (!argv[1])
4626 die("Option '%c' requires a value", opt);
4627 *optarg = argv[1];
4628 return 2;
4629 }
4630
4631 int parse_long_opt(const char *opt, const char **argv,
4632 const char **optarg)
4633 {
4634 const char *arg = argv[0];
4635 if (!skip_prefix(arg, "--", &arg))
4636 return 0;
4637 if (!skip_prefix(arg, opt, &arg))
4638 return 0;
4639 if (*arg == '=') { /* stuck form: --option=value */
4640 *optarg = arg + 1;
4641 return 1;
4642 }
4643 if (*arg != '\0')
4644 return 0;
4645 /* separate form: --option value */
4646 if (!argv[1])
4647 die("Option '--%s' requires a value", opt);
4648 *optarg = argv[1];
4649 return 2;
4650 }
4651
4652 static int stat_opt(struct diff_options *options, const char **av)
4653 {
4654 const char *arg = av[0];
4655 char *end;
4656 int width = options->stat_width;
4657 int name_width = options->stat_name_width;
4658 int graph_width = options->stat_graph_width;
4659 int count = options->stat_count;
4660 int argcount = 1;
4661
4662 if (!skip_prefix(arg, "--stat", &arg))
4663 BUG("stat option does not begin with --stat: %s", arg);
4664 end = (char *)arg;
4665
4666 switch (*arg) {
4667 case '-':
4668 if (skip_prefix(arg, "-width", &arg)) {
4669 if (*arg == '=')
4670 width = strtoul(arg + 1, &end, 10);
4671 else if (!*arg && !av[1])
4672 die_want_option("--stat-width");
4673 else if (!*arg) {
4674 width = strtoul(av[1], &end, 10);
4675 argcount = 2;
4676 }
4677 } else if (skip_prefix(arg, "-name-width", &arg)) {
4678 if (*arg == '=')
4679 name_width = strtoul(arg + 1, &end, 10);
4680 else if (!*arg && !av[1])
4681 die_want_option("--stat-name-width");
4682 else if (!*arg) {
4683 name_width = strtoul(av[1], &end, 10);
4684 argcount = 2;
4685 }
4686 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4687 if (*arg == '=')
4688 graph_width = strtoul(arg + 1, &end, 10);
4689 else if (!*arg && !av[1])
4690 die_want_option("--stat-graph-width");
4691 else if (!*arg) {
4692 graph_width = strtoul(av[1], &end, 10);
4693 argcount = 2;
4694 }
4695 } else if (skip_prefix(arg, "-count", &arg)) {
4696 if (*arg == '=')
4697 count = strtoul(arg + 1, &end, 10);
4698 else if (!*arg && !av[1])
4699 die_want_option("--stat-count");
4700 else if (!*arg) {
4701 count = strtoul(av[1], &end, 10);
4702 argcount = 2;
4703 }
4704 }
4705 break;
4706 case '=':
4707 width = strtoul(arg+1, &end, 10);
4708 if (*end == ',')
4709 name_width = strtoul(end+1, &end, 10);
4710 if (*end == ',')
4711 count = strtoul(end+1, &end, 10);
4712 }
4713
4714 /* Important! This checks all the error cases! */
4715 if (*end)
4716 return 0;
4717 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4718 options->stat_name_width = name_width;
4719 options->stat_graph_width = graph_width;
4720 options->stat_width = width;
4721 options->stat_count = count;
4722 return argcount;
4723 }
4724
4725 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4726 {
4727 struct strbuf errmsg = STRBUF_INIT;
4728 if (parse_dirstat_params(options, params, &errmsg))
4729 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4730 errmsg.buf);
4731 strbuf_release(&errmsg);
4732 /*
4733 * The caller knows a dirstat-related option is given from the command
4734 * line; allow it to say "return this_function();"
4735 */
4736 options->output_format |= DIFF_FORMAT_DIRSTAT;
4737 return 1;
4738 }
4739
4740 static int parse_submodule_opt(struct diff_options *options, const char *value)
4741 {
4742 if (parse_submodule_params(options, value))
4743 die(_("Failed to parse --submodule option parameter: '%s'"),
4744 value);
4745 return 1;
4746 }
4747
4748 static const char diff_status_letters[] = {
4749 DIFF_STATUS_ADDED,
4750 DIFF_STATUS_COPIED,
4751 DIFF_STATUS_DELETED,
4752 DIFF_STATUS_MODIFIED,
4753 DIFF_STATUS_RENAMED,
4754 DIFF_STATUS_TYPE_CHANGED,
4755 DIFF_STATUS_UNKNOWN,
4756 DIFF_STATUS_UNMERGED,
4757 DIFF_STATUS_FILTER_AON,
4758 DIFF_STATUS_FILTER_BROKEN,
4759 '\0',
4760 };
4761
4762 static unsigned int filter_bit['Z' + 1];
4763
4764 static void prepare_filter_bits(void)
4765 {
4766 int i;
4767
4768 if (!filter_bit[DIFF_STATUS_ADDED]) {
4769 for (i = 0; diff_status_letters[i]; i++)
4770 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4771 }
4772 }
4773
4774 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4775 {
4776 return opt->filter & filter_bit[(int) status];
4777 }
4778
4779 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4780 {
4781 int i, optch;
4782
4783 prepare_filter_bits();
4784
4785 /*
4786 * If there is a negation e.g. 'd' in the input, and we haven't
4787 * initialized the filter field with another --diff-filter, start
4788 * from full set of bits, except for AON.
4789 */
4790 if (!opt->filter) {
4791 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4792 if (optch < 'a' || 'z' < optch)
4793 continue;
4794 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4795 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4796 break;
4797 }
4798 }
4799
4800 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4801 unsigned int bit;
4802 int negate;
4803
4804 if ('a' <= optch && optch <= 'z') {
4805 negate = 1;
4806 optch = toupper(optch);
4807 } else {
4808 negate = 0;
4809 }
4810
4811 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4812 if (!bit)
4813 return optarg[i];
4814 if (negate)
4815 opt->filter &= ~bit;
4816 else
4817 opt->filter |= bit;
4818 }
4819 return 0;
4820 }
4821
4822 static void enable_patch_output(int *fmt) {
4823 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4824 *fmt |= DIFF_FORMAT_PATCH;
4825 }
4826
4827 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4828 {
4829 int val = parse_ws_error_highlight(arg);
4830
4831 if (val < 0) {
4832 error("unknown value after ws-error-highlight=%.*s",
4833 -1 - val, arg);
4834 return 0;
4835 }
4836 opt->ws_error_highlight = val;
4837 return 1;
4838 }
4839
4840 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4841 {
4842 struct object_id oid;
4843
4844 if (get_oid(arg, &oid))
4845 return error("unable to resolve '%s'", arg);
4846
4847 if (!opt->objfind)
4848 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4849
4850 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4851 opt->flags.recursive = 1;
4852 opt->flags.tree_in_recursive = 1;
4853 oidset_insert(opt->objfind, &oid);
4854 return 1;
4855 }
4856
4857 int diff_opt_parse(struct diff_options *options,
4858 const char **av, int ac, const char *prefix)
4859 {
4860 const char *arg = av[0];
4861 const char *optarg;
4862 int argcount;
4863
4864 if (!prefix)
4865 prefix = "";
4866
4867 /* Output format options */
4868 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4869 || opt_arg(arg, 'U', "unified", &options->context))
4870 enable_patch_output(&options->output_format);
4871 else if (!strcmp(arg, "--raw"))
4872 options->output_format |= DIFF_FORMAT_RAW;
4873 else if (!strcmp(arg, "--patch-with-raw")) {
4874 enable_patch_output(&options->output_format);
4875 options->output_format |= DIFF_FORMAT_RAW;
4876 } else if (!strcmp(arg, "--numstat"))
4877 options->output_format |= DIFF_FORMAT_NUMSTAT;
4878 else if (!strcmp(arg, "--shortstat"))
4879 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4880 else if (skip_prefix(arg, "-X", &arg) ||
4881 skip_to_optional_arg(arg, "--dirstat", &arg))
4882 return parse_dirstat_opt(options, arg);
4883 else if (!strcmp(arg, "--cumulative"))
4884 return parse_dirstat_opt(options, "cumulative");
4885 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4886 parse_dirstat_opt(options, "files");
4887 return parse_dirstat_opt(options, arg);
4888 }
4889 else if (!strcmp(arg, "--check"))
4890 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4891 else if (!strcmp(arg, "--summary"))
4892 options->output_format |= DIFF_FORMAT_SUMMARY;
4893 else if (!strcmp(arg, "--patch-with-stat")) {
4894 enable_patch_output(&options->output_format);
4895 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4896 } else if (!strcmp(arg, "--name-only"))
4897 options->output_format |= DIFF_FORMAT_NAME;
4898 else if (!strcmp(arg, "--name-status"))
4899 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4900 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4901 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4902 else if (starts_with(arg, "--stat"))
4903 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4904 return stat_opt(options, av);
4905 else if (!strcmp(arg, "--compact-summary")) {
4906 options->flags.stat_with_summary = 1;
4907 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4908 } else if (!strcmp(arg, "--no-compact-summary"))
4909 options->flags.stat_with_summary = 0;
4910 else if (skip_prefix(arg, "--output-indicator-new=", &arg))
4911 options->output_indicators[OUTPUT_INDICATOR_NEW] = arg[0];
4912 else if (skip_prefix(arg, "--output-indicator-old=", &arg))
4913 options->output_indicators[OUTPUT_INDICATOR_OLD] = arg[0];
4914 else if (skip_prefix(arg, "--output-indicator-context=", &arg))
4915 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = arg[0];
4916
4917 /* renames options */
4918 else if (starts_with(arg, "-B") ||
4919 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4920 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4921 return error("invalid argument to -B: %s", arg+2);
4922 }
4923 else if (starts_with(arg, "-M") ||
4924 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4925 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4926 return error("invalid argument to -M: %s", arg+2);
4927 options->detect_rename = DIFF_DETECT_RENAME;
4928 }
4929 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4930 options->irreversible_delete = 1;
4931 }
4932 else if (starts_with(arg, "-C") ||
4933 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4934 if (options->detect_rename == DIFF_DETECT_COPY)
4935 options->flags.find_copies_harder = 1;
4936 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4937 return error("invalid argument to -C: %s", arg+2);
4938 options->detect_rename = DIFF_DETECT_COPY;
4939 }
4940 else if (!strcmp(arg, "--no-renames"))
4941 options->detect_rename = 0;
4942 else if (!strcmp(arg, "--rename-empty"))
4943 options->flags.rename_empty = 1;
4944 else if (!strcmp(arg, "--no-rename-empty"))
4945 options->flags.rename_empty = 0;
4946 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4947 options->flags.relative_name = 1;
4948 if (arg)
4949 options->prefix = arg;
4950 }
4951
4952 /* xdiff options */
4953 else if (!strcmp(arg, "--minimal"))
4954 DIFF_XDL_SET(options, NEED_MINIMAL);
4955 else if (!strcmp(arg, "--no-minimal"))
4956 DIFF_XDL_CLR(options, NEED_MINIMAL);
4957 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4958 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4959 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4960 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4961 else if (!strcmp(arg, "--ignore-space-at-eol"))
4962 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4963 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4964 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4965 else if (!strcmp(arg, "--ignore-blank-lines"))
4966 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4967 else if (!strcmp(arg, "--indent-heuristic"))
4968 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4969 else if (!strcmp(arg, "--no-indent-heuristic"))
4970 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4971 else if (!strcmp(arg, "--patience")) {
4972 int i;
4973 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4974 /*
4975 * Both --patience and --anchored use PATIENCE_DIFF
4976 * internally, so remove any anchors previously
4977 * specified.
4978 */
4979 for (i = 0; i < options->anchors_nr; i++)
4980 free(options->anchors[i]);
4981 options->anchors_nr = 0;
4982 } else if (!strcmp(arg, "--histogram"))
4983 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4984 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4985 long value = parse_algorithm_value(optarg);
4986 if (value < 0)
4987 return error("option diff-algorithm accepts \"myers\", "
4988 "\"minimal\", \"patience\" and \"histogram\"");
4989 /* clear out previous settings */
4990 DIFF_XDL_CLR(options, NEED_MINIMAL);
4991 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4992 options->xdl_opts |= value;
4993 return argcount;
4994 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4995 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4996 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4997 options->anchors_alloc);
4998 options->anchors[options->anchors_nr++] = xstrdup(arg);
4999 }
5000
5001 /* flags options */
5002 else if (!strcmp(arg, "--binary")) {
5003 enable_patch_output(&options->output_format);
5004 options->flags.binary = 1;
5005 }
5006 else if (!strcmp(arg, "--full-index"))
5007 options->flags.full_index = 1;
5008 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
5009 options->flags.text = 1;
5010 else if (!strcmp(arg, "-R"))
5011 options->flags.reverse_diff = 1;
5012 else if (!strcmp(arg, "--find-copies-harder"))
5013 options->flags.find_copies_harder = 1;
5014 else if (!strcmp(arg, "--follow"))
5015 options->flags.follow_renames = 1;
5016 else if (!strcmp(arg, "--no-follow")) {
5017 options->flags.follow_renames = 0;
5018 options->flags.default_follow_renames = 0;
5019 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
5020 int value = git_config_colorbool(NULL, arg);
5021 if (value < 0)
5022 return error("option `color' expects \"always\", \"auto\", or \"never\"");
5023 options->use_color = value;
5024 }
5025 else if (!strcmp(arg, "--no-color"))
5026 options->use_color = 0;
5027 else if (!strcmp(arg, "--color-moved")) {
5028 if (diff_color_moved_default)
5029 options->color_moved = diff_color_moved_default;
5030 if (options->color_moved == COLOR_MOVED_NO)
5031 options->color_moved = COLOR_MOVED_DEFAULT;
5032 } else if (!strcmp(arg, "--no-color-moved"))
5033 options->color_moved = COLOR_MOVED_NO;
5034 else if (skip_prefix(arg, "--color-moved=", &arg)) {
5035 int cm = parse_color_moved(arg);
5036 if (cm < 0)
5037 die("bad --color-moved argument: %s", arg);
5038 options->color_moved = cm;
5039 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
5040 options->color_moved_ws_handling = parse_color_moved_ws(arg);
5041 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
5042 options->use_color = 1;
5043 options->word_diff = DIFF_WORDS_COLOR;
5044 }
5045 else if (!strcmp(arg, "--word-diff")) {
5046 if (options->word_diff == DIFF_WORDS_NONE)
5047 options->word_diff = DIFF_WORDS_PLAIN;
5048 }
5049 else if (skip_prefix(arg, "--word-diff=", &arg)) {
5050 if (!strcmp(arg, "plain"))
5051 options->word_diff = DIFF_WORDS_PLAIN;
5052 else if (!strcmp(arg, "color")) {
5053 options->use_color = 1;
5054 options->word_diff = DIFF_WORDS_COLOR;
5055 }
5056 else if (!strcmp(arg, "porcelain"))
5057 options->word_diff = DIFF_WORDS_PORCELAIN;
5058 else if (!strcmp(arg, "none"))
5059 options->word_diff = DIFF_WORDS_NONE;
5060 else
5061 die("bad --word-diff argument: %s", arg);
5062 }
5063 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5064 if (options->word_diff == DIFF_WORDS_NONE)
5065 options->word_diff = DIFF_WORDS_PLAIN;
5066 options->word_regex = optarg;
5067 return argcount;
5068 }
5069 else if (!strcmp(arg, "--exit-code"))
5070 options->flags.exit_with_status = 1;
5071 else if (!strcmp(arg, "--quiet"))
5072 options->flags.quick = 1;
5073 else if (!strcmp(arg, "--ext-diff"))
5074 options->flags.allow_external = 1;
5075 else if (!strcmp(arg, "--no-ext-diff"))
5076 options->flags.allow_external = 0;
5077 else if (!strcmp(arg, "--textconv")) {
5078 options->flags.allow_textconv = 1;
5079 options->flags.textconv_set_via_cmdline = 1;
5080 } else if (!strcmp(arg, "--no-textconv"))
5081 options->flags.allow_textconv = 0;
5082 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5083 options->flags.override_submodule_config = 1;
5084 handle_ignore_submodules_arg(options, arg);
5085 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5086 return parse_submodule_opt(options, arg);
5087 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5088 return parse_ws_error_highlight_opt(options, arg);
5089 else if (!strcmp(arg, "--ita-invisible-in-index"))
5090 options->ita_invisible_in_index = 1;
5091 else if (!strcmp(arg, "--ita-visible-in-index"))
5092 options->ita_invisible_in_index = 0;
5093
5094 /* misc options */
5095 else if (!strcmp(arg, "-z"))
5096 options->line_termination = 0;
5097 else if ((argcount = short_opt('l', av, &optarg))) {
5098 options->rename_limit = strtoul(optarg, NULL, 10);
5099 return argcount;
5100 }
5101 else if ((argcount = short_opt('S', av, &optarg))) {
5102 options->pickaxe = optarg;
5103 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5104 return argcount;
5105 } else if ((argcount = short_opt('G', av, &optarg))) {
5106 options->pickaxe = optarg;
5107 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5108 return argcount;
5109 }
5110 else if (!strcmp(arg, "--pickaxe-all"))
5111 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5112 else if (!strcmp(arg, "--pickaxe-regex"))
5113 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5114 else if ((argcount = short_opt('O', av, &optarg))) {
5115 options->orderfile = prefix_filename(prefix, optarg);
5116 return argcount;
5117 } else if (skip_prefix(arg, "--find-object=", &arg))
5118 return parse_objfind_opt(options, arg);
5119 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5120 int offending = parse_diff_filter_opt(optarg, options);
5121 if (offending)
5122 die("unknown change class '%c' in --diff-filter=%s",
5123 offending, optarg);
5124 return argcount;
5125 }
5126 else if (!strcmp(arg, "--no-abbrev"))
5127 options->abbrev = 0;
5128 else if (!strcmp(arg, "--abbrev"))
5129 options->abbrev = DEFAULT_ABBREV;
5130 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5131 options->abbrev = strtoul(arg, NULL, 10);
5132 if (options->abbrev < MINIMUM_ABBREV)
5133 options->abbrev = MINIMUM_ABBREV;
5134 else if (the_hash_algo->hexsz < options->abbrev)
5135 options->abbrev = the_hash_algo->hexsz;
5136 }
5137 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5138 options->a_prefix = optarg;
5139 return argcount;
5140 }
5141 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5142 options->line_prefix = optarg;
5143 options->line_prefix_length = strlen(options->line_prefix);
5144 graph_setup_line_prefix(options);
5145 return argcount;
5146 }
5147 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5148 options->b_prefix = optarg;
5149 return argcount;
5150 }
5151 else if (!strcmp(arg, "--no-prefix"))
5152 options->a_prefix = options->b_prefix = "";
5153 else if (opt_arg(arg, '\0', "inter-hunk-context",
5154 &options->interhunkcontext))
5155 ;
5156 else if (!strcmp(arg, "-W"))
5157 options->flags.funccontext = 1;
5158 else if (!strcmp(arg, "--function-context"))
5159 options->flags.funccontext = 1;
5160 else if (!strcmp(arg, "--no-function-context"))
5161 options->flags.funccontext = 0;
5162 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5163 char *path = prefix_filename(prefix, optarg);
5164 options->file = xfopen(path, "w");
5165 options->close_file = 1;
5166 if (options->use_color != GIT_COLOR_ALWAYS)
5167 options->use_color = GIT_COLOR_NEVER;
5168 free(path);
5169 return argcount;
5170 } else
5171 return 0;
5172 return 1;
5173 }
5174
5175 int parse_rename_score(const char **cp_p)
5176 {
5177 unsigned long num, scale;
5178 int ch, dot;
5179 const char *cp = *cp_p;
5180
5181 num = 0;
5182 scale = 1;
5183 dot = 0;
5184 for (;;) {
5185 ch = *cp;
5186 if ( !dot && ch == '.' ) {
5187 scale = 1;
5188 dot = 1;
5189 } else if ( ch == '%' ) {
5190 scale = dot ? scale*100 : 100;
5191 cp++; /* % is always at the end */
5192 break;
5193 } else if ( ch >= '0' && ch <= '9' ) {
5194 if ( scale < 100000 ) {
5195 scale *= 10;
5196 num = (num*10) + (ch-'0');
5197 }
5198 } else {
5199 break;
5200 }
5201 cp++;
5202 }
5203 *cp_p = cp;
5204
5205 /* user says num divided by scale and we say internally that
5206 * is MAX_SCORE * num / scale.
5207 */
5208 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5209 }
5210
5211 static int diff_scoreopt_parse(const char *opt)
5212 {
5213 int opt1, opt2, cmd;
5214
5215 if (*opt++ != '-')
5216 return -1;
5217 cmd = *opt++;
5218 if (cmd == '-') {
5219 /* convert the long-form arguments into short-form versions */
5220 if (skip_prefix(opt, "break-rewrites", &opt)) {
5221 if (*opt == 0 || *opt++ == '=')
5222 cmd = 'B';
5223 } else if (skip_prefix(opt, "find-copies", &opt)) {
5224 if (*opt == 0 || *opt++ == '=')
5225 cmd = 'C';
5226 } else if (skip_prefix(opt, "find-renames", &opt)) {
5227 if (*opt == 0 || *opt++ == '=')
5228 cmd = 'M';
5229 }
5230 }
5231 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5232 return -1; /* that is not a -M, -C, or -B option */
5233
5234 opt1 = parse_rename_score(&opt);
5235 if (cmd != 'B')
5236 opt2 = 0;
5237 else {
5238 if (*opt == 0)
5239 opt2 = 0;
5240 else if (*opt != '/')
5241 return -1; /* we expect -B80/99 or -B80 */
5242 else {
5243 opt++;
5244 opt2 = parse_rename_score(&opt);
5245 }
5246 }
5247 if (*opt != 0)
5248 return -1;
5249 return opt1 | (opt2 << 16);
5250 }
5251
5252 struct diff_queue_struct diff_queued_diff;
5253
5254 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5255 {
5256 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5257 queue->queue[queue->nr++] = dp;
5258 }
5259
5260 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5261 struct diff_filespec *one,
5262 struct diff_filespec *two)
5263 {
5264 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5265 dp->one = one;
5266 dp->two = two;
5267 if (queue)
5268 diff_q(queue, dp);
5269 return dp;
5270 }
5271
5272 void diff_free_filepair(struct diff_filepair *p)
5273 {
5274 free_filespec(p->one);
5275 free_filespec(p->two);
5276 free(p);
5277 }
5278
5279 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5280 {
5281 int abblen;
5282 const char *abbrev;
5283
5284 /* Do we want all 40 hex characters? */
5285 if (len == the_hash_algo->hexsz)
5286 return oid_to_hex(oid);
5287
5288 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5289 abbrev = diff_abbrev_oid(oid, len);
5290
5291 if (!print_sha1_ellipsis())
5292 return abbrev;
5293
5294 abblen = strlen(abbrev);
5295
5296 /*
5297 * In well-behaved cases, where the abbreviated result is the
5298 * same as the requested length, append three dots after the
5299 * abbreviation (hence the whole logic is limited to the case
5300 * where abblen < 37); when the actual abbreviated result is a
5301 * bit longer than the requested length, we reduce the number
5302 * of dots so that they match the well-behaved ones. However,
5303 * if the actual abbreviation is longer than the requested
5304 * length by more than three, we give up on aligning, and add
5305 * three dots anyway, to indicate that the output is not the
5306 * full object name. Yes, this may be suboptimal, but this
5307 * appears only in "diff --raw --abbrev" output and it is not
5308 * worth the effort to change it now. Note that this would
5309 * likely to work fine when the automatic sizing of default
5310 * abbreviation length is used--we would be fed -1 in "len" in
5311 * that case, and will end up always appending three-dots, but
5312 * the automatic sizing is supposed to give abblen that ensures
5313 * uniqueness across all objects (statistically speaking).
5314 */
5315 if (abblen < the_hash_algo->hexsz - 3) {
5316 static char hex[GIT_MAX_HEXSZ + 1];
5317 if (len < abblen && abblen <= len + 2)
5318 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5319 else
5320 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5321 return hex;
5322 }
5323
5324 return oid_to_hex(oid);
5325 }
5326
5327 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5328 {
5329 int line_termination = opt->line_termination;
5330 int inter_name_termination = line_termination ? '\t' : '\0';
5331
5332 fprintf(opt->file, "%s", diff_line_prefix(opt));
5333 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5334 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5335 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5336 fprintf(opt->file, "%s ",
5337 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5338 }
5339 if (p->score) {
5340 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5341 inter_name_termination);
5342 } else {
5343 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5344 }
5345
5346 if (p->status == DIFF_STATUS_COPIED ||
5347 p->status == DIFF_STATUS_RENAMED) {
5348 const char *name_a, *name_b;
5349 name_a = p->one->path;
5350 name_b = p->two->path;
5351 strip_prefix(opt->prefix_length, &name_a, &name_b);
5352 write_name_quoted(name_a, opt->file, inter_name_termination);
5353 write_name_quoted(name_b, opt->file, line_termination);
5354 } else {
5355 const char *name_a, *name_b;
5356 name_a = p->one->mode ? p->one->path : p->two->path;
5357 name_b = NULL;
5358 strip_prefix(opt->prefix_length, &name_a, &name_b);
5359 write_name_quoted(name_a, opt->file, line_termination);
5360 }
5361 }
5362
5363 int diff_unmodified_pair(struct diff_filepair *p)
5364 {
5365 /* This function is written stricter than necessary to support
5366 * the currently implemented transformers, but the idea is to
5367 * let transformers to produce diff_filepairs any way they want,
5368 * and filter and clean them up here before producing the output.
5369 */
5370 struct diff_filespec *one = p->one, *two = p->two;
5371
5372 if (DIFF_PAIR_UNMERGED(p))
5373 return 0; /* unmerged is interesting */
5374
5375 /* deletion, addition, mode or type change
5376 * and rename are all interesting.
5377 */
5378 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5379 DIFF_PAIR_MODE_CHANGED(p) ||
5380 strcmp(one->path, two->path))
5381 return 0;
5382
5383 /* both are valid and point at the same path. that is, we are
5384 * dealing with a change.
5385 */
5386 if (one->oid_valid && two->oid_valid &&
5387 oideq(&one->oid, &two->oid) &&
5388 !one->dirty_submodule && !two->dirty_submodule)
5389 return 1; /* no change */
5390 if (!one->oid_valid && !two->oid_valid)
5391 return 1; /* both look at the same file on the filesystem. */
5392 return 0;
5393 }
5394
5395 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5396 {
5397 if (diff_unmodified_pair(p))
5398 return;
5399
5400 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5401 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5402 return; /* no tree diffs in patch format */
5403
5404 run_diff(p, o);
5405 }
5406
5407 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5408 struct diffstat_t *diffstat)
5409 {
5410 if (diff_unmodified_pair(p))
5411 return;
5412
5413 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5414 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5415 return; /* no useful stat for tree diffs */
5416
5417 run_diffstat(p, o, diffstat);
5418 }
5419
5420 static void diff_flush_checkdiff(struct diff_filepair *p,
5421 struct diff_options *o)
5422 {
5423 if (diff_unmodified_pair(p))
5424 return;
5425
5426 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5427 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5428 return; /* nothing to check in tree diffs */
5429
5430 run_checkdiff(p, o);
5431 }
5432
5433 int diff_queue_is_empty(void)
5434 {
5435 struct diff_queue_struct *q = &diff_queued_diff;
5436 int i;
5437 for (i = 0; i < q->nr; i++)
5438 if (!diff_unmodified_pair(q->queue[i]))
5439 return 0;
5440 return 1;
5441 }
5442
5443 #if DIFF_DEBUG
5444 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5445 {
5446 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5447 x, one ? one : "",
5448 s->path,
5449 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5450 s->mode,
5451 s->oid_valid ? oid_to_hex(&s->oid) : "");
5452 fprintf(stderr, "queue[%d] %s size %lu\n",
5453 x, one ? one : "",
5454 s->size);
5455 }
5456
5457 void diff_debug_filepair(const struct diff_filepair *p, int i)
5458 {
5459 diff_debug_filespec(p->one, i, "one");
5460 diff_debug_filespec(p->two, i, "two");
5461 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5462 p->score, p->status ? p->status : '?',
5463 p->one->rename_used, p->broken_pair);
5464 }
5465
5466 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5467 {
5468 int i;
5469 if (msg)
5470 fprintf(stderr, "%s\n", msg);
5471 fprintf(stderr, "q->nr = %d\n", q->nr);
5472 for (i = 0; i < q->nr; i++) {
5473 struct diff_filepair *p = q->queue[i];
5474 diff_debug_filepair(p, i);
5475 }
5476 }
5477 #endif
5478
5479 static void diff_resolve_rename_copy(void)
5480 {
5481 int i;
5482 struct diff_filepair *p;
5483 struct diff_queue_struct *q = &diff_queued_diff;
5484
5485 diff_debug_queue("resolve-rename-copy", q);
5486
5487 for (i = 0; i < q->nr; i++) {
5488 p = q->queue[i];
5489 p->status = 0; /* undecided */
5490 if (DIFF_PAIR_UNMERGED(p))
5491 p->status = DIFF_STATUS_UNMERGED;
5492 else if (!DIFF_FILE_VALID(p->one))
5493 p->status = DIFF_STATUS_ADDED;
5494 else if (!DIFF_FILE_VALID(p->two))
5495 p->status = DIFF_STATUS_DELETED;
5496 else if (DIFF_PAIR_TYPE_CHANGED(p))
5497 p->status = DIFF_STATUS_TYPE_CHANGED;
5498
5499 /* from this point on, we are dealing with a pair
5500 * whose both sides are valid and of the same type, i.e.
5501 * either in-place edit or rename/copy edit.
5502 */
5503 else if (DIFF_PAIR_RENAME(p)) {
5504 /*
5505 * A rename might have re-connected a broken
5506 * pair up, causing the pathnames to be the
5507 * same again. If so, that's not a rename at
5508 * all, just a modification..
5509 *
5510 * Otherwise, see if this source was used for
5511 * multiple renames, in which case we decrement
5512 * the count, and call it a copy.
5513 */
5514 if (!strcmp(p->one->path, p->two->path))
5515 p->status = DIFF_STATUS_MODIFIED;
5516 else if (--p->one->rename_used > 0)
5517 p->status = DIFF_STATUS_COPIED;
5518 else
5519 p->status = DIFF_STATUS_RENAMED;
5520 }
5521 else if (!oideq(&p->one->oid, &p->two->oid) ||
5522 p->one->mode != p->two->mode ||
5523 p->one->dirty_submodule ||
5524 p->two->dirty_submodule ||
5525 is_null_oid(&p->one->oid))
5526 p->status = DIFF_STATUS_MODIFIED;
5527 else {
5528 /* This is a "no-change" entry and should not
5529 * happen anymore, but prepare for broken callers.
5530 */
5531 error("feeding unmodified %s to diffcore",
5532 p->one->path);
5533 p->status = DIFF_STATUS_UNKNOWN;
5534 }
5535 }
5536 diff_debug_queue("resolve-rename-copy done", q);
5537 }
5538
5539 static int check_pair_status(struct diff_filepair *p)
5540 {
5541 switch (p->status) {
5542 case DIFF_STATUS_UNKNOWN:
5543 return 0;
5544 case 0:
5545 die("internal error in diff-resolve-rename-copy");
5546 default:
5547 return 1;
5548 }
5549 }
5550
5551 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5552 {
5553 int fmt = opt->output_format;
5554
5555 if (fmt & DIFF_FORMAT_CHECKDIFF)
5556 diff_flush_checkdiff(p, opt);
5557 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5558 diff_flush_raw(p, opt);
5559 else if (fmt & DIFF_FORMAT_NAME) {
5560 const char *name_a, *name_b;
5561 name_a = p->two->path;
5562 name_b = NULL;
5563 strip_prefix(opt->prefix_length, &name_a, &name_b);
5564 fprintf(opt->file, "%s", diff_line_prefix(opt));
5565 write_name_quoted(name_a, opt->file, opt->line_termination);
5566 }
5567 }
5568
5569 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5570 {
5571 struct strbuf sb = STRBUF_INIT;
5572 if (fs->mode)
5573 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5574 else
5575 strbuf_addf(&sb, " %s ", newdelete);
5576
5577 quote_c_style(fs->path, &sb, NULL, 0);
5578 strbuf_addch(&sb, '\n');
5579 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5580 sb.buf, sb.len, 0);
5581 strbuf_release(&sb);
5582 }
5583
5584 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5585 int show_name)
5586 {
5587 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5588 struct strbuf sb = STRBUF_INIT;
5589 strbuf_addf(&sb, " mode change %06o => %06o",
5590 p->one->mode, p->two->mode);
5591 if (show_name) {
5592 strbuf_addch(&sb, ' ');
5593 quote_c_style(p->two->path, &sb, NULL, 0);
5594 }
5595 strbuf_addch(&sb, '\n');
5596 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5597 sb.buf, sb.len, 0);
5598 strbuf_release(&sb);
5599 }
5600 }
5601
5602 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5603 struct diff_filepair *p)
5604 {
5605 struct strbuf sb = STRBUF_INIT;
5606 struct strbuf names = STRBUF_INIT;
5607
5608 pprint_rename(&names, p->one->path, p->two->path);
5609 strbuf_addf(&sb, " %s %s (%d%%)\n",
5610 renamecopy, names.buf, similarity_index(p));
5611 strbuf_release(&names);
5612 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5613 sb.buf, sb.len, 0);
5614 show_mode_change(opt, p, 0);
5615 strbuf_release(&sb);
5616 }
5617
5618 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5619 {
5620 switch(p->status) {
5621 case DIFF_STATUS_DELETED:
5622 show_file_mode_name(opt, "delete", p->one);
5623 break;
5624 case DIFF_STATUS_ADDED:
5625 show_file_mode_name(opt, "create", p->two);
5626 break;
5627 case DIFF_STATUS_COPIED:
5628 show_rename_copy(opt, "copy", p);
5629 break;
5630 case DIFF_STATUS_RENAMED:
5631 show_rename_copy(opt, "rename", p);
5632 break;
5633 default:
5634 if (p->score) {
5635 struct strbuf sb = STRBUF_INIT;
5636 strbuf_addstr(&sb, " rewrite ");
5637 quote_c_style(p->two->path, &sb, NULL, 0);
5638 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5639 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5640 sb.buf, sb.len, 0);
5641 strbuf_release(&sb);
5642 }
5643 show_mode_change(opt, p, !p->score);
5644 break;
5645 }
5646 }
5647
5648 struct patch_id_t {
5649 git_SHA_CTX *ctx;
5650 int patchlen;
5651 };
5652
5653 static int remove_space(char *line, int len)
5654 {
5655 int i;
5656 char *dst = line;
5657 unsigned char c;
5658
5659 for (i = 0; i < len; i++)
5660 if (!isspace((c = line[i])))
5661 *dst++ = c;
5662
5663 return dst - line;
5664 }
5665
5666 static void patch_id_consume(void *priv, char *line, unsigned long len)
5667 {
5668 struct patch_id_t *data = priv;
5669 int new_len;
5670
5671 /* Ignore line numbers when computing the SHA1 of the patch */
5672 if (starts_with(line, "@@ -"))
5673 return;
5674
5675 new_len = remove_space(line, len);
5676
5677 git_SHA1_Update(data->ctx, line, new_len);
5678 data->patchlen += new_len;
5679 }
5680
5681 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5682 {
5683 git_SHA1_Update(ctx, str, strlen(str));
5684 }
5685
5686 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5687 {
5688 /* large enough for 2^32 in octal */
5689 char buf[12];
5690 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5691 git_SHA1_Update(ctx, buf, len);
5692 }
5693
5694 /* returns 0 upon success, and writes result into sha1 */
5695 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5696 {
5697 struct diff_queue_struct *q = &diff_queued_diff;
5698 int i;
5699 git_SHA_CTX ctx;
5700 struct patch_id_t data;
5701
5702 git_SHA1_Init(&ctx);
5703 memset(&data, 0, sizeof(struct patch_id_t));
5704 data.ctx = &ctx;
5705
5706 for (i = 0; i < q->nr; i++) {
5707 xpparam_t xpp;
5708 xdemitconf_t xecfg;
5709 mmfile_t mf1, mf2;
5710 struct diff_filepair *p = q->queue[i];
5711 int len1, len2;
5712
5713 memset(&xpp, 0, sizeof(xpp));
5714 memset(&xecfg, 0, sizeof(xecfg));
5715 if (p->status == 0)
5716 return error("internal diff status error");
5717 if (p->status == DIFF_STATUS_UNKNOWN)
5718 continue;
5719 if (diff_unmodified_pair(p))
5720 continue;
5721 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5722 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5723 continue;
5724 if (DIFF_PAIR_UNMERGED(p))
5725 continue;
5726
5727 diff_fill_oid_info(p->one, options->repo->index);
5728 diff_fill_oid_info(p->two, options->repo->index);
5729
5730 len1 = remove_space(p->one->path, strlen(p->one->path));
5731 len2 = remove_space(p->two->path, strlen(p->two->path));
5732 patch_id_add_string(&ctx, "diff--git");
5733 patch_id_add_string(&ctx, "a/");
5734 git_SHA1_Update(&ctx, p->one->path, len1);
5735 patch_id_add_string(&ctx, "b/");
5736 git_SHA1_Update(&ctx, p->two->path, len2);
5737
5738 if (p->one->mode == 0) {
5739 patch_id_add_string(&ctx, "newfilemode");
5740 patch_id_add_mode(&ctx, p->two->mode);
5741 patch_id_add_string(&ctx, "---/dev/null");
5742 patch_id_add_string(&ctx, "+++b/");
5743 git_SHA1_Update(&ctx, p->two->path, len2);
5744 } else if (p->two->mode == 0) {
5745 patch_id_add_string(&ctx, "deletedfilemode");
5746 patch_id_add_mode(&ctx, p->one->mode);
5747 patch_id_add_string(&ctx, "---a/");
5748 git_SHA1_Update(&ctx, p->one->path, len1);
5749 patch_id_add_string(&ctx, "+++/dev/null");
5750 } else {
5751 patch_id_add_string(&ctx, "---a/");
5752 git_SHA1_Update(&ctx, p->one->path, len1);
5753 patch_id_add_string(&ctx, "+++b/");
5754 git_SHA1_Update(&ctx, p->two->path, len2);
5755 }
5756
5757 if (diff_header_only)
5758 continue;
5759
5760 if (fill_mmfile(options->repo, &mf1, p->one) < 0 ||
5761 fill_mmfile(options->repo, &mf2, p->two) < 0)
5762 return error("unable to read files to diff");
5763
5764 if (diff_filespec_is_binary(options->repo, p->one) ||
5765 diff_filespec_is_binary(options->repo, p->two)) {
5766 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5767 GIT_SHA1_HEXSZ);
5768 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5769 GIT_SHA1_HEXSZ);
5770 continue;
5771 }
5772
5773 xpp.flags = 0;
5774 xecfg.ctxlen = 3;
5775 xecfg.flags = 0;
5776 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5777 &xpp, &xecfg))
5778 return error("unable to generate patch-id diff for %s",
5779 p->one->path);
5780 }
5781
5782 git_SHA1_Final(oid->hash, &ctx);
5783 return 0;
5784 }
5785
5786 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5787 {
5788 struct diff_queue_struct *q = &diff_queued_diff;
5789 int i;
5790 int result = diff_get_patch_id(options, oid, diff_header_only);
5791
5792 for (i = 0; i < q->nr; i++)
5793 diff_free_filepair(q->queue[i]);
5794
5795 free(q->queue);
5796 DIFF_QUEUE_CLEAR(q);
5797
5798 return result;
5799 }
5800
5801 static int is_summary_empty(const struct diff_queue_struct *q)
5802 {
5803 int i;
5804
5805 for (i = 0; i < q->nr; i++) {
5806 const struct diff_filepair *p = q->queue[i];
5807
5808 switch (p->status) {
5809 case DIFF_STATUS_DELETED:
5810 case DIFF_STATUS_ADDED:
5811 case DIFF_STATUS_COPIED:
5812 case DIFF_STATUS_RENAMED:
5813 return 0;
5814 default:
5815 if (p->score)
5816 return 0;
5817 if (p->one->mode && p->two->mode &&
5818 p->one->mode != p->two->mode)
5819 return 0;
5820 break;
5821 }
5822 }
5823 return 1;
5824 }
5825
5826 static const char rename_limit_warning[] =
5827 N_("inexact rename detection was skipped due to too many files.");
5828
5829 static const char degrade_cc_to_c_warning[] =
5830 N_("only found copies from modified paths due to too many files.");
5831
5832 static const char rename_limit_advice[] =
5833 N_("you may want to set your %s variable to at least "
5834 "%d and retry the command.");
5835
5836 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5837 {
5838 fflush(stdout);
5839 if (degraded_cc)
5840 warning(_(degrade_cc_to_c_warning));
5841 else if (needed)
5842 warning(_(rename_limit_warning));
5843 else
5844 return;
5845 if (0 < needed)
5846 warning(_(rename_limit_advice), varname, needed);
5847 }
5848
5849 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5850 {
5851 int i;
5852 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5853 struct diff_queue_struct *q = &diff_queued_diff;
5854
5855 if (WSEH_NEW & WS_RULE_MASK)
5856 BUG("WS rules bit mask overlaps with diff symbol flags");
5857
5858 if (o->color_moved)
5859 o->emitted_symbols = &esm;
5860
5861 for (i = 0; i < q->nr; i++) {
5862 struct diff_filepair *p = q->queue[i];
5863 if (check_pair_status(p))
5864 diff_flush_patch(p, o);
5865 }
5866
5867 if (o->emitted_symbols) {
5868 if (o->color_moved) {
5869 struct hashmap add_lines, del_lines;
5870
5871 if (o->color_moved_ws_handling &
5872 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5873 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5874
5875 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5876 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5877
5878 add_lines_to_move_detection(o, &add_lines, &del_lines);
5879 mark_color_as_moved(o, &add_lines, &del_lines);
5880 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5881 dim_moved_lines(o);
5882
5883 hashmap_free(&add_lines, 1);
5884 hashmap_free(&del_lines, 1);
5885 }
5886
5887 for (i = 0; i < esm.nr; i++)
5888 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5889
5890 for (i = 0; i < esm.nr; i++)
5891 free((void *)esm.buf[i].line);
5892 }
5893 esm.nr = 0;
5894 }
5895
5896 void diff_flush(struct diff_options *options)
5897 {
5898 struct diff_queue_struct *q = &diff_queued_diff;
5899 int i, output_format = options->output_format;
5900 int separator = 0;
5901 int dirstat_by_line = 0;
5902
5903 /*
5904 * Order: raw, stat, summary, patch
5905 * or: name/name-status/checkdiff (other bits clear)
5906 */
5907 if (!q->nr)
5908 goto free_queue;
5909
5910 if (output_format & (DIFF_FORMAT_RAW |
5911 DIFF_FORMAT_NAME |
5912 DIFF_FORMAT_NAME_STATUS |
5913 DIFF_FORMAT_CHECKDIFF)) {
5914 for (i = 0; i < q->nr; i++) {
5915 struct diff_filepair *p = q->queue[i];
5916 if (check_pair_status(p))
5917 flush_one_pair(p, options);
5918 }
5919 separator++;
5920 }
5921
5922 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5923 dirstat_by_line = 1;
5924
5925 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5926 dirstat_by_line) {
5927 struct diffstat_t diffstat;
5928
5929 memset(&diffstat, 0, sizeof(struct diffstat_t));
5930 for (i = 0; i < q->nr; i++) {
5931 struct diff_filepair *p = q->queue[i];
5932 if (check_pair_status(p))
5933 diff_flush_stat(p, options, &diffstat);
5934 }
5935 if (output_format & DIFF_FORMAT_NUMSTAT)
5936 show_numstat(&diffstat, options);
5937 if (output_format & DIFF_FORMAT_DIFFSTAT)
5938 show_stats(&diffstat, options);
5939 if (output_format & DIFF_FORMAT_SHORTSTAT)
5940 show_shortstats(&diffstat, options);
5941 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5942 show_dirstat_by_line(&diffstat, options);
5943 free_diffstat_info(&diffstat);
5944 separator++;
5945 }
5946 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5947 show_dirstat(options);
5948
5949 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5950 for (i = 0; i < q->nr; i++) {
5951 diff_summary(options, q->queue[i]);
5952 }
5953 separator++;
5954 }
5955
5956 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5957 options->flags.exit_with_status &&
5958 options->flags.diff_from_contents) {
5959 /*
5960 * run diff_flush_patch for the exit status. setting
5961 * options->file to /dev/null should be safe, because we
5962 * aren't supposed to produce any output anyway.
5963 */
5964 if (options->close_file)
5965 fclose(options->file);
5966 options->file = xfopen("/dev/null", "w");
5967 options->close_file = 1;
5968 options->color_moved = 0;
5969 for (i = 0; i < q->nr; i++) {
5970 struct diff_filepair *p = q->queue[i];
5971 if (check_pair_status(p))
5972 diff_flush_patch(p, options);
5973 if (options->found_changes)
5974 break;
5975 }
5976 }
5977
5978 if (output_format & DIFF_FORMAT_PATCH) {
5979 if (separator) {
5980 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5981 if (options->stat_sep)
5982 /* attach patch instead of inline */
5983 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5984 NULL, 0, 0);
5985 }
5986
5987 diff_flush_patch_all_file_pairs(options);
5988 }
5989
5990 if (output_format & DIFF_FORMAT_CALLBACK)
5991 options->format_callback(q, options, options->format_callback_data);
5992
5993 for (i = 0; i < q->nr; i++)
5994 diff_free_filepair(q->queue[i]);
5995 free_queue:
5996 free(q->queue);
5997 DIFF_QUEUE_CLEAR(q);
5998 if (options->close_file)
5999 fclose(options->file);
6000
6001 /*
6002 * Report the content-level differences with HAS_CHANGES;
6003 * diff_addremove/diff_change does not set the bit when
6004 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
6005 */
6006 if (options->flags.diff_from_contents) {
6007 if (options->found_changes)
6008 options->flags.has_changes = 1;
6009 else
6010 options->flags.has_changes = 0;
6011 }
6012 }
6013
6014 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
6015 {
6016 return (((p->status == DIFF_STATUS_MODIFIED) &&
6017 ((p->score &&
6018 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
6019 (!p->score &&
6020 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
6021 ((p->status != DIFF_STATUS_MODIFIED) &&
6022 filter_bit_tst(p->status, options)));
6023 }
6024
6025 static void diffcore_apply_filter(struct diff_options *options)
6026 {
6027 int i;
6028 struct diff_queue_struct *q = &diff_queued_diff;
6029 struct diff_queue_struct outq;
6030
6031 DIFF_QUEUE_CLEAR(&outq);
6032
6033 if (!options->filter)
6034 return;
6035
6036 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
6037 int found;
6038 for (i = found = 0; !found && i < q->nr; i++) {
6039 if (match_filter(options, q->queue[i]))
6040 found++;
6041 }
6042 if (found)
6043 return;
6044
6045 /* otherwise we will clear the whole queue
6046 * by copying the empty outq at the end of this
6047 * function, but first clear the current entries
6048 * in the queue.
6049 */
6050 for (i = 0; i < q->nr; i++)
6051 diff_free_filepair(q->queue[i]);
6052 }
6053 else {
6054 /* Only the matching ones */
6055 for (i = 0; i < q->nr; i++) {
6056 struct diff_filepair *p = q->queue[i];
6057 if (match_filter(options, p))
6058 diff_q(&outq, p);
6059 else
6060 diff_free_filepair(p);
6061 }
6062 }
6063 free(q->queue);
6064 *q = outq;
6065 }
6066
6067 /* Check whether two filespecs with the same mode and size are identical */
6068 static int diff_filespec_is_identical(struct repository *r,
6069 struct diff_filespec *one,
6070 struct diff_filespec *two)
6071 {
6072 if (S_ISGITLINK(one->mode))
6073 return 0;
6074 if (diff_populate_filespec(r, one, 0))
6075 return 0;
6076 if (diff_populate_filespec(r, two, 0))
6077 return 0;
6078 return !memcmp(one->data, two->data, one->size);
6079 }
6080
6081 static int diff_filespec_check_stat_unmatch(struct repository *r,
6082 struct diff_filepair *p)
6083 {
6084 if (p->done_skip_stat_unmatch)
6085 return p->skip_stat_unmatch_result;
6086
6087 p->done_skip_stat_unmatch = 1;
6088 p->skip_stat_unmatch_result = 0;
6089 /*
6090 * 1. Entries that come from stat info dirtiness
6091 * always have both sides (iow, not create/delete),
6092 * one side of the object name is unknown, with
6093 * the same mode and size. Keep the ones that
6094 * do not match these criteria. They have real
6095 * differences.
6096 *
6097 * 2. At this point, the file is known to be modified,
6098 * with the same mode and size, and the object
6099 * name of one side is unknown. Need to inspect
6100 * the identical contents.
6101 */
6102 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6103 !DIFF_FILE_VALID(p->two) ||
6104 (p->one->oid_valid && p->two->oid_valid) ||
6105 (p->one->mode != p->two->mode) ||
6106 diff_populate_filespec(r, p->one, CHECK_SIZE_ONLY) ||
6107 diff_populate_filespec(r, p->two, CHECK_SIZE_ONLY) ||
6108 (p->one->size != p->two->size) ||
6109 !diff_filespec_is_identical(r, p->one, p->two)) /* (2) */
6110 p->skip_stat_unmatch_result = 1;
6111 return p->skip_stat_unmatch_result;
6112 }
6113
6114 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6115 {
6116 int i;
6117 struct diff_queue_struct *q = &diff_queued_diff;
6118 struct diff_queue_struct outq;
6119 DIFF_QUEUE_CLEAR(&outq);
6120
6121 for (i = 0; i < q->nr; i++) {
6122 struct diff_filepair *p = q->queue[i];
6123
6124 if (diff_filespec_check_stat_unmatch(diffopt->repo, p))
6125 diff_q(&outq, p);
6126 else {
6127 /*
6128 * The caller can subtract 1 from skip_stat_unmatch
6129 * to determine how many paths were dirty only
6130 * due to stat info mismatch.
6131 */
6132 if (!diffopt->flags.no_index)
6133 diffopt->skip_stat_unmatch++;
6134 diff_free_filepair(p);
6135 }
6136 }
6137 free(q->queue);
6138 *q = outq;
6139 }
6140
6141 static int diffnamecmp(const void *a_, const void *b_)
6142 {
6143 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6144 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6145 const char *name_a, *name_b;
6146
6147 name_a = a->one ? a->one->path : a->two->path;
6148 name_b = b->one ? b->one->path : b->two->path;
6149 return strcmp(name_a, name_b);
6150 }
6151
6152 void diffcore_fix_diff_index(struct diff_options *options)
6153 {
6154 struct diff_queue_struct *q = &diff_queued_diff;
6155 QSORT(q->queue, q->nr, diffnamecmp);
6156 }
6157
6158 void diffcore_std(struct diff_options *options)
6159 {
6160 /* NOTE please keep the following in sync with diff_tree_combined() */
6161 if (options->skip_stat_unmatch)
6162 diffcore_skip_stat_unmatch(options);
6163 if (!options->found_follow) {
6164 /* See try_to_follow_renames() in tree-diff.c */
6165 if (options->break_opt != -1)
6166 diffcore_break(options->repo,
6167 options->break_opt);
6168 if (options->detect_rename)
6169 diffcore_rename(options);
6170 if (options->break_opt != -1)
6171 diffcore_merge_broken();
6172 }
6173 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6174 diffcore_pickaxe(options);
6175 if (options->orderfile)
6176 diffcore_order(options->orderfile);
6177 if (!options->found_follow)
6178 /* See try_to_follow_renames() in tree-diff.c */
6179 diff_resolve_rename_copy();
6180 diffcore_apply_filter(options);
6181
6182 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6183 options->flags.has_changes = 1;
6184 else
6185 options->flags.has_changes = 0;
6186
6187 options->found_follow = 0;
6188 }
6189
6190 int diff_result_code(struct diff_options *opt, int status)
6191 {
6192 int result = 0;
6193
6194 diff_warn_rename_limit("diff.renameLimit",
6195 opt->needed_rename_limit,
6196 opt->degraded_cc_to_c);
6197 if (!opt->flags.exit_with_status &&
6198 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6199 return status;
6200 if (opt->flags.exit_with_status &&
6201 opt->flags.has_changes)
6202 result |= 01;
6203 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6204 opt->flags.check_failed)
6205 result |= 02;
6206 return result;
6207 }
6208
6209 int diff_can_quit_early(struct diff_options *opt)
6210 {
6211 return (opt->flags.quick &&
6212 !opt->filter &&
6213 opt->flags.has_changes);
6214 }
6215
6216 /*
6217 * Shall changes to this submodule be ignored?
6218 *
6219 * Submodule changes can be configured to be ignored separately for each path,
6220 * but that configuration can be overridden from the command line.
6221 */
6222 static int is_submodule_ignored(const char *path, struct diff_options *options)
6223 {
6224 int ignored = 0;
6225 struct diff_flags orig_flags = options->flags;
6226 if (!options->flags.override_submodule_config)
6227 set_diffopt_flags_from_submodule_config(options, path);
6228 if (options->flags.ignore_submodules)
6229 ignored = 1;
6230 options->flags = orig_flags;
6231 return ignored;
6232 }
6233
6234 void diff_addremove(struct diff_options *options,
6235 int addremove, unsigned mode,
6236 const struct object_id *oid,
6237 int oid_valid,
6238 const char *concatpath, unsigned dirty_submodule)
6239 {
6240 struct diff_filespec *one, *two;
6241
6242 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6243 return;
6244
6245 /* This may look odd, but it is a preparation for
6246 * feeding "there are unchanged files which should
6247 * not produce diffs, but when you are doing copy
6248 * detection you would need them, so here they are"
6249 * entries to the diff-core. They will be prefixed
6250 * with something like '=' or '*' (I haven't decided
6251 * which but should not make any difference).
6252 * Feeding the same new and old to diff_change()
6253 * also has the same effect.
6254 * Before the final output happens, they are pruned after
6255 * merged into rename/copy pairs as appropriate.
6256 */
6257 if (options->flags.reverse_diff)
6258 addremove = (addremove == '+' ? '-' :
6259 addremove == '-' ? '+' : addremove);
6260
6261 if (options->prefix &&
6262 strncmp(concatpath, options->prefix, options->prefix_length))
6263 return;
6264
6265 one = alloc_filespec(concatpath);
6266 two = alloc_filespec(concatpath);
6267
6268 if (addremove != '+')
6269 fill_filespec(one, oid, oid_valid, mode);
6270 if (addremove != '-') {
6271 fill_filespec(two, oid, oid_valid, mode);
6272 two->dirty_submodule = dirty_submodule;
6273 }
6274
6275 diff_queue(&diff_queued_diff, one, two);
6276 if (!options->flags.diff_from_contents)
6277 options->flags.has_changes = 1;
6278 }
6279
6280 void diff_change(struct diff_options *options,
6281 unsigned old_mode, unsigned new_mode,
6282 const struct object_id *old_oid,
6283 const struct object_id *new_oid,
6284 int old_oid_valid, int new_oid_valid,
6285 const char *concatpath,
6286 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6287 {
6288 struct diff_filespec *one, *two;
6289 struct diff_filepair *p;
6290
6291 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6292 is_submodule_ignored(concatpath, options))
6293 return;
6294
6295 if (options->flags.reverse_diff) {
6296 SWAP(old_mode, new_mode);
6297 SWAP(old_oid, new_oid);
6298 SWAP(old_oid_valid, new_oid_valid);
6299 SWAP(old_dirty_submodule, new_dirty_submodule);
6300 }
6301
6302 if (options->prefix &&
6303 strncmp(concatpath, options->prefix, options->prefix_length))
6304 return;
6305
6306 one = alloc_filespec(concatpath);
6307 two = alloc_filespec(concatpath);
6308 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6309 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6310 one->dirty_submodule = old_dirty_submodule;
6311 two->dirty_submodule = new_dirty_submodule;
6312 p = diff_queue(&diff_queued_diff, one, two);
6313
6314 if (options->flags.diff_from_contents)
6315 return;
6316
6317 if (options->flags.quick && options->skip_stat_unmatch &&
6318 !diff_filespec_check_stat_unmatch(options->repo, p))
6319 return;
6320
6321 options->flags.has_changes = 1;
6322 }
6323
6324 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6325 {
6326 struct diff_filepair *pair;
6327 struct diff_filespec *one, *two;
6328
6329 if (options->prefix &&
6330 strncmp(path, options->prefix, options->prefix_length))
6331 return NULL;
6332
6333 one = alloc_filespec(path);
6334 two = alloc_filespec(path);
6335 pair = diff_queue(&diff_queued_diff, one, two);
6336 pair->is_unmerged = 1;
6337 return pair;
6338 }
6339
6340 static char *run_textconv(struct repository *r,
6341 const char *pgm,
6342 struct diff_filespec *spec,
6343 size_t *outsize)
6344 {
6345 struct diff_tempfile *temp;
6346 const char *argv[3];
6347 const char **arg = argv;
6348 struct child_process child = CHILD_PROCESS_INIT;
6349 struct strbuf buf = STRBUF_INIT;
6350 int err = 0;
6351
6352 temp = prepare_temp_file(r, spec->path, spec);
6353 *arg++ = pgm;
6354 *arg++ = temp->name;
6355 *arg = NULL;
6356
6357 child.use_shell = 1;
6358 child.argv = argv;
6359 child.out = -1;
6360 if (start_command(&child)) {
6361 remove_tempfile();
6362 return NULL;
6363 }
6364
6365 if (strbuf_read(&buf, child.out, 0) < 0)
6366 err = error("error reading from textconv command '%s'", pgm);
6367 close(child.out);
6368
6369 if (finish_command(&child) || err) {
6370 strbuf_release(&buf);
6371 remove_tempfile();
6372 return NULL;
6373 }
6374 remove_tempfile();
6375
6376 return strbuf_detach(&buf, outsize);
6377 }
6378
6379 size_t fill_textconv(struct repository *r,
6380 struct userdiff_driver *driver,
6381 struct diff_filespec *df,
6382 char **outbuf)
6383 {
6384 size_t size;
6385
6386 if (!driver) {
6387 if (!DIFF_FILE_VALID(df)) {
6388 *outbuf = "";
6389 return 0;
6390 }
6391 if (diff_populate_filespec(r, df, 0))
6392 die("unable to read files to diff");
6393 *outbuf = df->data;
6394 return df->size;
6395 }
6396
6397 if (!driver->textconv)
6398 BUG("fill_textconv called with non-textconv driver");
6399
6400 if (driver->textconv_cache && df->oid_valid) {
6401 *outbuf = notes_cache_get(driver->textconv_cache,
6402 &df->oid,
6403 &size);
6404 if (*outbuf)
6405 return size;
6406 }
6407
6408 *outbuf = run_textconv(r, driver->textconv, df, &size);
6409 if (!*outbuf)
6410 die("unable to read files to diff");
6411
6412 if (driver->textconv_cache && df->oid_valid) {
6413 /* ignore errors, as we might be in a readonly repository */
6414 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6415 size);
6416 /*
6417 * we could save up changes and flush them all at the end,
6418 * but we would need an extra call after all diffing is done.
6419 * Since generating a cache entry is the slow path anyway,
6420 * this extra overhead probably isn't a big deal.
6421 */
6422 notes_cache_write(driver->textconv_cache);
6423 }
6424
6425 return size;
6426 }
6427
6428 int textconv_object(struct repository *r,
6429 const char *path,
6430 unsigned mode,
6431 const struct object_id *oid,
6432 int oid_valid,
6433 char **buf,
6434 unsigned long *buf_size)
6435 {
6436 struct diff_filespec *df;
6437 struct userdiff_driver *textconv;
6438
6439 df = alloc_filespec(path);
6440 fill_filespec(df, oid, oid_valid, mode);
6441 textconv = get_textconv(r->index, df);
6442 if (!textconv) {
6443 free_filespec(df);
6444 return 0;
6445 }
6446
6447 *buf_size = fill_textconv(r, textconv, df, buf);
6448 free_filespec(df);
6449 return 1;
6450 }
6451
6452 void setup_diff_pager(struct diff_options *opt)
6453 {
6454 /*
6455 * If the user asked for our exit code, then either they want --quiet
6456 * or --exit-code. We should definitely not bother with a pager in the
6457 * former case, as we will generate no output. Since we still properly
6458 * report our exit code even when a pager is run, we _could_ run a
6459 * pager with --exit-code. But since we have not done so historically,
6460 * and because it is easy to find people oneline advising "git diff
6461 * --exit-code" in hooks and other scripts, we do not do so.
6462 */
6463 if (!opt->flags.exit_with_status &&
6464 check_pager_config("diff") != 0)
6465 setup_pager();
6466 }
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