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diff.c: simplify caller of emit_line_0
[git.git] / diff.c
blobf6df18af9132b8acab0de655dc8c0d3f5eeb3e1e
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
289 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed_zebra', 'plain'"));
290 }
291
292 static int parse_color_moved_ws(const char *arg)
293 {
294 int ret = 0;
295 struct string_list l = STRING_LIST_INIT_DUP;
296 struct string_list_item *i;
297
298 string_list_split(&l, arg, ',', -1);
299
300 for_each_string_list_item(i, &l) {
301 struct strbuf sb = STRBUF_INIT;
302 strbuf_addstr(&sb, i->string);
303 strbuf_trim(&sb);
304
305 if (!strcmp(sb.buf, "ignore-space-change"))
306 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
307 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
308 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
309 else if (!strcmp(sb.buf, "ignore-all-space"))
310 ret |= XDF_IGNORE_WHITESPACE;
311 else if (!strcmp(sb.buf, "allow-indentation-change"))
312 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
313 else
314 error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
315
316 strbuf_release(&sb);
317 }
318
319 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
320 (ret & XDF_WHITESPACE_FLAGS))
321 die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
322
323 string_list_clear(&l, 0);
324
325 return ret;
326 }
327
328 int git_diff_ui_config(const char *var, const char *value, void *cb)
329 {
330 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
331 diff_use_color_default = git_config_colorbool(var, value);
332 return 0;
333 }
334 if (!strcmp(var, "diff.colormoved")) {
335 int cm = parse_color_moved(value);
336 if (cm < 0)
337 return -1;
338 diff_color_moved_default = cm;
339 return 0;
340 }
341 if (!strcmp(var, "diff.colormovedws")) {
342 int cm = parse_color_moved_ws(value);
343 if (cm < 0)
344 return -1;
345 diff_color_moved_ws_default = cm;
346 return 0;
347 }
348 if (!strcmp(var, "diff.context")) {
349 diff_context_default = git_config_int(var, value);
350 if (diff_context_default < 0)
351 return -1;
352 return 0;
353 }
354 if (!strcmp(var, "diff.interhunkcontext")) {
355 diff_interhunk_context_default = git_config_int(var, value);
356 if (diff_interhunk_context_default < 0)
357 return -1;
358 return 0;
359 }
360 if (!strcmp(var, "diff.renames")) {
361 diff_detect_rename_default = git_config_rename(var, value);
362 return 0;
363 }
364 if (!strcmp(var, "diff.autorefreshindex")) {
365 diff_auto_refresh_index = git_config_bool(var, value);
366 return 0;
367 }
368 if (!strcmp(var, "diff.mnemonicprefix")) {
369 diff_mnemonic_prefix = git_config_bool(var, value);
370 return 0;
371 }
372 if (!strcmp(var, "diff.noprefix")) {
373 diff_no_prefix = git_config_bool(var, value);
374 return 0;
375 }
376 if (!strcmp(var, "diff.statgraphwidth")) {
377 diff_stat_graph_width = git_config_int(var, value);
378 return 0;
379 }
380 if (!strcmp(var, "diff.external"))
381 return git_config_string(&external_diff_cmd_cfg, var, value);
382 if (!strcmp(var, "diff.wordregex"))
383 return git_config_string(&diff_word_regex_cfg, var, value);
384 if (!strcmp(var, "diff.orderfile"))
385 return git_config_pathname(&diff_order_file_cfg, var, value);
386
387 if (!strcmp(var, "diff.ignoresubmodules"))
388 handle_ignore_submodules_arg(&default_diff_options, value);
389
390 if (!strcmp(var, "diff.submodule")) {
391 if (parse_submodule_params(&default_diff_options, value))
392 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
393 value);
394 return 0;
395 }
396
397 if (!strcmp(var, "diff.algorithm")) {
398 diff_algorithm = parse_algorithm_value(value);
399 if (diff_algorithm < 0)
400 return -1;
401 return 0;
402 }
403
404 if (!strcmp(var, "diff.wserrorhighlight")) {
405 int val = parse_ws_error_highlight(value);
406 if (val < 0)
407 return -1;
408 ws_error_highlight_default = val;
409 return 0;
410 }
411
412 if (git_color_config(var, value, cb) < 0)
413 return -1;
414
415 return git_diff_basic_config(var, value, cb);
416 }
417
418 int git_diff_basic_config(const char *var, const char *value, void *cb)
419 {
420 const char *name;
421
422 if (!strcmp(var, "diff.renamelimit")) {
423 diff_rename_limit_default = git_config_int(var, value);
424 return 0;
425 }
426
427 if (userdiff_config(var, value) < 0)
428 return -1;
429
430 if (skip_prefix(var, "diff.color.", &name) ||
431 skip_prefix(var, "color.diff.", &name)) {
432 int slot = parse_diff_color_slot(name);
433 if (slot < 0)
434 return 0;
435 if (!value)
436 return config_error_nonbool(var);
437 return color_parse(value, diff_colors[slot]);
438 }
439
440 /* like GNU diff's --suppress-blank-empty option */
441 if (!strcmp(var, "diff.suppressblankempty") ||
442 /* for backwards compatibility */
443 !strcmp(var, "diff.suppress-blank-empty")) {
444 diff_suppress_blank_empty = git_config_bool(var, value);
445 return 0;
446 }
447
448 if (!strcmp(var, "diff.dirstat")) {
449 struct strbuf errmsg = STRBUF_INIT;
450 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
451 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
452 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
453 errmsg.buf);
454 strbuf_release(&errmsg);
455 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
456 return 0;
457 }
458
459 if (git_diff_heuristic_config(var, value, cb) < 0)
460 return -1;
461
462 return git_default_config(var, value, cb);
463 }
464
465 static char *quote_two(const char *one, const char *two)
466 {
467 int need_one = quote_c_style(one, NULL, NULL, 1);
468 int need_two = quote_c_style(two, NULL, NULL, 1);
469 struct strbuf res = STRBUF_INIT;
470
471 if (need_one + need_two) {
472 strbuf_addch(&res, '"');
473 quote_c_style(one, &res, NULL, 1);
474 quote_c_style(two, &res, NULL, 1);
475 strbuf_addch(&res, '"');
476 } else {
477 strbuf_addstr(&res, one);
478 strbuf_addstr(&res, two);
479 }
480 return strbuf_detach(&res, NULL);
481 }
482
483 static const char *external_diff(void)
484 {
485 static const char *external_diff_cmd = NULL;
486 static int done_preparing = 0;
487
488 if (done_preparing)
489 return external_diff_cmd;
490 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
491 if (!external_diff_cmd)
492 external_diff_cmd = external_diff_cmd_cfg;
493 done_preparing = 1;
494 return external_diff_cmd;
495 }
496
497 /*
498 * Keep track of files used for diffing. Sometimes such an entry
499 * refers to a temporary file, sometimes to an existing file, and
500 * sometimes to "/dev/null".
501 */
502 static struct diff_tempfile {
503 /*
504 * filename external diff should read from, or NULL if this
505 * entry is currently not in use:
506 */
507 const char *name;
508
509 char hex[GIT_MAX_HEXSZ + 1];
510 char mode[10];
511
512 /*
513 * If this diff_tempfile instance refers to a temporary file,
514 * this tempfile object is used to manage its lifetime.
515 */
516 struct tempfile *tempfile;
517 } diff_temp[2];
518
519 struct emit_callback {
520 int color_diff;
521 unsigned ws_rule;
522 int blank_at_eof_in_preimage;
523 int blank_at_eof_in_postimage;
524 int lno_in_preimage;
525 int lno_in_postimage;
526 const char **label_path;
527 struct diff_words_data *diff_words;
528 struct diff_options *opt;
529 struct strbuf *header;
530 };
531
532 static int count_lines(const char *data, int size)
533 {
534 int count, ch, completely_empty = 1, nl_just_seen = 0;
535 count = 0;
536 while (0 < size--) {
537 ch = *data++;
538 if (ch == '\n') {
539 count++;
540 nl_just_seen = 1;
541 completely_empty = 0;
542 }
543 else {
544 nl_just_seen = 0;
545 completely_empty = 0;
546 }
547 }
548 if (completely_empty)
549 return 0;
550 if (!nl_just_seen)
551 count++; /* no trailing newline */
552 return count;
553 }
554
555 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
556 {
557 if (!DIFF_FILE_VALID(one)) {
558 mf->ptr = (char *)""; /* does not matter */
559 mf->size = 0;
560 return 0;
561 }
562 else if (diff_populate_filespec(one, 0))
563 return -1;
564
565 mf->ptr = one->data;
566 mf->size = one->size;
567 return 0;
568 }
569
570 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
571 static unsigned long diff_filespec_size(struct diff_filespec *one)
572 {
573 if (!DIFF_FILE_VALID(one))
574 return 0;
575 diff_populate_filespec(one, CHECK_SIZE_ONLY);
576 return one->size;
577 }
578
579 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
580 {
581 char *ptr = mf->ptr;
582 long size = mf->size;
583 int cnt = 0;
584
585 if (!size)
586 return cnt;
587 ptr += size - 1; /* pointing at the very end */
588 if (*ptr != '\n')
589 ; /* incomplete line */
590 else
591 ptr--; /* skip the last LF */
592 while (mf->ptr < ptr) {
593 char *prev_eol;
594 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
595 if (*prev_eol == '\n')
596 break;
597 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
598 break;
599 cnt++;
600 ptr = prev_eol - 1;
601 }
602 return cnt;
603 }
604
605 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
606 struct emit_callback *ecbdata)
607 {
608 int l1, l2, at;
609 unsigned ws_rule = ecbdata->ws_rule;
610 l1 = count_trailing_blank(mf1, ws_rule);
611 l2 = count_trailing_blank(mf2, ws_rule);
612 if (l2 <= l1) {
613 ecbdata->blank_at_eof_in_preimage = 0;
614 ecbdata->blank_at_eof_in_postimage = 0;
615 return;
616 }
617 at = count_lines(mf1->ptr, mf1->size);
618 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
619
620 at = count_lines(mf2->ptr, mf2->size);
621 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
622 }
623
624 static void emit_line_0(struct diff_options *o,
625 const char *set, unsigned reverse, const char *reset,
626 int first, const char *line, int len)
627 {
628 int has_trailing_newline, has_trailing_carriage_return;
629 int nofirst;
630 FILE *file = o->file;
631
632 if (first)
633 fputs(diff_line_prefix(o), file);
634 else if (!len)
635 return;
636
637 if (len == 0) {
638 has_trailing_newline = (first == '\n');
639 has_trailing_carriage_return = (!has_trailing_newline &&
640 (first == '\r'));
641 nofirst = has_trailing_newline || has_trailing_carriage_return;
642 } else {
643 has_trailing_newline = (len > 0 && line[len-1] == '\n');
644 if (has_trailing_newline)
645 len--;
646 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
647 if (has_trailing_carriage_return)
648 len--;
649 nofirst = 0;
650 }
651
652 if (len || !nofirst) {
653 if (reverse && want_color(o->use_color))
654 fputs(GIT_COLOR_REVERSE, file);
655 fputs(set, file);
656 if (first && !nofirst)
657 fputc(first, file);
658 fwrite(line, len, 1, file);
659 fputs(reset, file);
660 }
661 if (has_trailing_carriage_return)
662 fputc('\r', file);
663 if (has_trailing_newline)
664 fputc('\n', file);
665 }
666
667 static void emit_line(struct diff_options *o, const char *set, const char *reset,
668 const char *line, int len)
669 {
670 emit_line_0(o, set, 0, reset, line[0], line+1, len-1);
671 }
672
673 enum diff_symbol {
674 DIFF_SYMBOL_BINARY_DIFF_HEADER,
675 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
676 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
677 DIFF_SYMBOL_BINARY_DIFF_BODY,
678 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
679 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
680 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
681 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
682 DIFF_SYMBOL_STATS_LINE,
683 DIFF_SYMBOL_WORD_DIFF,
684 DIFF_SYMBOL_STAT_SEP,
685 DIFF_SYMBOL_SUMMARY,
686 DIFF_SYMBOL_SUBMODULE_ADD,
687 DIFF_SYMBOL_SUBMODULE_DEL,
688 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
689 DIFF_SYMBOL_SUBMODULE_MODIFIED,
690 DIFF_SYMBOL_SUBMODULE_HEADER,
691 DIFF_SYMBOL_SUBMODULE_ERROR,
692 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
693 DIFF_SYMBOL_REWRITE_DIFF,
694 DIFF_SYMBOL_BINARY_FILES,
695 DIFF_SYMBOL_HEADER,
696 DIFF_SYMBOL_FILEPAIR_PLUS,
697 DIFF_SYMBOL_FILEPAIR_MINUS,
698 DIFF_SYMBOL_WORDS_PORCELAIN,
699 DIFF_SYMBOL_WORDS,
700 DIFF_SYMBOL_CONTEXT,
701 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
702 DIFF_SYMBOL_PLUS,
703 DIFF_SYMBOL_MINUS,
704 DIFF_SYMBOL_NO_LF_EOF,
705 DIFF_SYMBOL_CONTEXT_FRAGINFO,
706 DIFF_SYMBOL_CONTEXT_MARKER,
707 DIFF_SYMBOL_SEPARATOR
708 };
709 /*
710 * Flags for content lines:
711 * 0..12 are whitespace rules
712 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
713 * 16 is marking if the line is blank at EOF
714 */
715 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
716 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
717 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
718 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
719 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
720
721 /*
722 * This struct is used when we need to buffer the output of the diff output.
723 *
724 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
725 * into the pre/post image file. This pointer could be a union with the
726 * line pointer. By storing an offset into the file instead of the literal line,
727 * we can decrease the memory footprint for the buffered output. At first we
728 * may want to only have indirection for the content lines, but we could also
729 * enhance the state for emitting prefabricated lines, e.g. the similarity
730 * score line or hunk/file headers would only need to store a number or path
731 * and then the output can be constructed later on depending on state.
732 */
733 struct emitted_diff_symbol {
734 const char *line;
735 int len;
736 int flags;
737 enum diff_symbol s;
738 };
739 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
740
741 struct emitted_diff_symbols {
742 struct emitted_diff_symbol *buf;
743 int nr, alloc;
744 };
745 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
746
747 static void append_emitted_diff_symbol(struct diff_options *o,
748 struct emitted_diff_symbol *e)
749 {
750 struct emitted_diff_symbol *f;
751
752 ALLOC_GROW(o->emitted_symbols->buf,
753 o->emitted_symbols->nr + 1,
754 o->emitted_symbols->alloc);
755 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
756
757 memcpy(f, e, sizeof(struct emitted_diff_symbol));
758 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
759 }
760
761 struct moved_entry {
762 struct hashmap_entry ent;
763 const struct emitted_diff_symbol *es;
764 struct moved_entry *next_line;
765 struct ws_delta *wsd;
766 };
767
768 /**
769 * The struct ws_delta holds white space differences between moved lines, i.e.
770 * between '+' and '-' lines that have been detected to be a move.
771 * The string contains the difference in leading white spaces, before the
772 * rest of the line is compared using the white space config for move
773 * coloring. The current_longer indicates if the first string in the
774 * comparision is longer than the second.
775 */
776 struct ws_delta {
777 char *string;
778 unsigned int current_longer : 1;
779 };
780 #define WS_DELTA_INIT { NULL, 0 }
781
782 static int compute_ws_delta(const struct emitted_diff_symbol *a,
783 const struct emitted_diff_symbol *b,
784 struct ws_delta *out)
785 {
786 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
787 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
788 int d = longer->len - shorter->len;
789
790 out->string = xmemdupz(longer->line, d);
791 out->current_longer = (a == longer);
792
793 return !strncmp(longer->line + d, shorter->line, shorter->len);
794 }
795
796 static int cmp_in_block_with_wsd(const struct diff_options *o,
797 const struct moved_entry *cur,
798 const struct moved_entry *match,
799 struct moved_entry *pmb,
800 int n)
801 {
802 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
803 int al = cur->es->len, cl = l->len;
804 const char *a = cur->es->line,
805 *b = match->es->line,
806 *c = l->line;
807
808 int wslen;
809
810 /*
811 * We need to check if 'cur' is equal to 'match'.
812 * As those are from the same (+/-) side, we do not need to adjust for
813 * indent changes. However these were found using fuzzy matching
814 * so we do have to check if they are equal.
815 */
816 if (strcmp(a, b))
817 return 1;
818
819 if (!pmb->wsd)
820 /*
821 * No white space delta was carried forward? This can happen
822 * when we exit early in this function and do not carry
823 * forward ws.
824 */
825 return 1;
826
827 /*
828 * The indent changes of the block are known and carried forward in
829 * pmb->wsd; however we need to check if the indent changes of the
830 * current line are still the same as before.
831 *
832 * To do so we need to compare 'l' to 'cur', adjusting the
833 * one of them for the white spaces, depending which was longer.
834 */
835
836 wslen = strlen(pmb->wsd->string);
837 if (pmb->wsd->current_longer) {
838 c += wslen;
839 cl -= wslen;
840 } else {
841 a += wslen;
842 al -= wslen;
843 }
844
845 if (strcmp(a, c))
846 return 1;
847
848 return 0;
849 }
850
851 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
852 const void *entry,
853 const void *entry_or_key,
854 const void *keydata)
855 {
856 const struct diff_options *diffopt = hashmap_cmp_fn_data;
857 const struct moved_entry *a = entry;
858 const struct moved_entry *b = entry_or_key;
859 unsigned flags = diffopt->color_moved_ws_handling
860 & XDF_WHITESPACE_FLAGS;
861
862 if (diffopt->color_moved_ws_handling &
863 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
864 /*
865 * As there is not specific white space config given,
866 * we'd need to check for a new block, so ignore all
867 * white space. The setup of the white space
868 * configuration for the next block is done else where
869 */
870 flags |= XDF_IGNORE_WHITESPACE;
871
872 return !xdiff_compare_lines(a->es->line, a->es->len,
873 b->es->line, b->es->len,
874 flags);
875 }
876
877 static struct moved_entry *prepare_entry(struct diff_options *o,
878 int line_no)
879 {
880 struct moved_entry *ret = xmalloc(sizeof(*ret));
881 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
882 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
883
884 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
885 ret->es = l;
886 ret->next_line = NULL;
887 ret->wsd = NULL;
888
889 return ret;
890 }
891
892 static void add_lines_to_move_detection(struct diff_options *o,
893 struct hashmap *add_lines,
894 struct hashmap *del_lines)
895 {
896 struct moved_entry *prev_line = NULL;
897
898 int n;
899 for (n = 0; n < o->emitted_symbols->nr; n++) {
900 struct hashmap *hm;
901 struct moved_entry *key;
902
903 switch (o->emitted_symbols->buf[n].s) {
904 case DIFF_SYMBOL_PLUS:
905 hm = add_lines;
906 break;
907 case DIFF_SYMBOL_MINUS:
908 hm = del_lines;
909 break;
910 default:
911 prev_line = NULL;
912 continue;
913 }
914
915 key = prepare_entry(o, n);
916 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
917 prev_line->next_line = key;
918
919 hashmap_add(hm, key);
920 prev_line = key;
921 }
922 }
923
924 static void pmb_advance_or_null(struct diff_options *o,
925 struct moved_entry *match,
926 struct hashmap *hm,
927 struct moved_entry **pmb,
928 int pmb_nr)
929 {
930 int i;
931 for (i = 0; i < pmb_nr; i++) {
932 struct moved_entry *prev = pmb[i];
933 struct moved_entry *cur = (prev && prev->next_line) ?
934 prev->next_line : NULL;
935 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
936 pmb[i] = cur;
937 } else {
938 pmb[i] = NULL;
939 }
940 }
941 }
942
943 static void pmb_advance_or_null_multi_match(struct diff_options *o,
944 struct moved_entry *match,
945 struct hashmap *hm,
946 struct moved_entry **pmb,
947 int pmb_nr, int n)
948 {
949 int i;
950 char *got_match = xcalloc(1, pmb_nr);
951
952 for (; match; match = hashmap_get_next(hm, match)) {
953 for (i = 0; i < pmb_nr; i++) {
954 struct moved_entry *prev = pmb[i];
955 struct moved_entry *cur = (prev && prev->next_line) ?
956 prev->next_line : NULL;
957 if (!cur)
958 continue;
959 if (!cmp_in_block_with_wsd(o, cur, match, pmb[i], n))
960 got_match[i] |= 1;
961 }
962 }
963
964 for (i = 0; i < pmb_nr; i++) {
965 if (got_match[i]) {
966 /* Carry the white space delta forward */
967 pmb[i]->next_line->wsd = pmb[i]->wsd;
968 pmb[i] = pmb[i]->next_line;
969 } else
970 pmb[i] = NULL;
971 }
972 }
973
974 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
975 int pmb_nr)
976 {
977 int lp, rp;
978
979 /* Shrink the set of potential block to the remaining running */
980 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
981 while (lp < pmb_nr && pmb[lp])
982 lp++;
983 /* lp points at the first NULL now */
984
985 while (rp > -1 && !pmb[rp])
986 rp--;
987 /* rp points at the last non-NULL */
988
989 if (lp < pmb_nr && rp > -1 && lp < rp) {
990 pmb[lp] = pmb[rp];
991 if (pmb[rp]->wsd) {
992 free(pmb[rp]->wsd->string);
993 FREE_AND_NULL(pmb[rp]->wsd);
994 }
995 pmb[rp] = NULL;
996 rp--;
997 lp++;
998 }
999 }
1000
1001 /* Remember the number of running sets */
1002 return rp + 1;
1003 }
1004
1005 /*
1006 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1007 *
1008 * Otherwise, if the last block has fewer alphanumeric characters than
1009 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1010 * that block.
1011 *
1012 * The last block consists of the (n - block_length)'th line up to but not
1013 * including the nth line.
1014 *
1015 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1016 * Think of a way to unify them.
1017 */
1018 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1019 {
1020 int i, alnum_count = 0;
1021 if (o->color_moved == COLOR_MOVED_PLAIN)
1022 return;
1023 for (i = 1; i < block_length + 1; i++) {
1024 const char *c = o->emitted_symbols->buf[n - i].line;
1025 for (; *c; c++) {
1026 if (!isalnum(*c))
1027 continue;
1028 alnum_count++;
1029 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1030 return;
1031 }
1032 }
1033 for (i = 1; i < block_length + 1; i++)
1034 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1035 }
1036
1037 /* Find blocks of moved code, delegate actual coloring decision to helper */
1038 static void mark_color_as_moved(struct diff_options *o,
1039 struct hashmap *add_lines,
1040 struct hashmap *del_lines)
1041 {
1042 struct moved_entry **pmb = NULL; /* potentially moved blocks */
1043 int pmb_nr = 0, pmb_alloc = 0;
1044 int n, flipped_block = 1, block_length = 0;
1045
1046
1047 for (n = 0; n < o->emitted_symbols->nr; n++) {
1048 struct hashmap *hm = NULL;
1049 struct moved_entry *key;
1050 struct moved_entry *match = NULL;
1051 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1052
1053 switch (l->s) {
1054 case DIFF_SYMBOL_PLUS:
1055 hm = del_lines;
1056 key = prepare_entry(o, n);
1057 match = hashmap_get(hm, key, NULL);
1058 free(key);
1059 break;
1060 case DIFF_SYMBOL_MINUS:
1061 hm = add_lines;
1062 key = prepare_entry(o, n);
1063 match = hashmap_get(hm, key, NULL);
1064 free(key);
1065 break;
1066 default:
1067 flipped_block = 1;
1068 }
1069
1070 if (!match) {
1071 adjust_last_block(o, n, block_length);
1072 pmb_nr = 0;
1073 block_length = 0;
1074 continue;
1075 }
1076
1077 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1078
1079 if (o->color_moved == COLOR_MOVED_PLAIN)
1080 continue;
1081
1082 if (o->color_moved_ws_handling &
1083 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1084 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1085 else
1086 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1087
1088 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1089
1090 if (pmb_nr == 0) {
1091 /*
1092 * The current line is the start of a new block.
1093 * Setup the set of potential blocks.
1094 */
1095 for (; match; match = hashmap_get_next(hm, match)) {
1096 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1097 if (o->color_moved_ws_handling &
1098 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1099 struct ws_delta *wsd = xmalloc(sizeof(*match->wsd));
1100 if (compute_ws_delta(l, match->es, wsd)) {
1101 match->wsd = wsd;
1102 pmb[pmb_nr++] = match;
1103 } else
1104 free(wsd);
1105 } else {
1106 pmb[pmb_nr++] = match;
1107 }
1108 }
1109
1110 flipped_block = (flipped_block + 1) % 2;
1111
1112 adjust_last_block(o, n, block_length);
1113 block_length = 0;
1114 }
1115
1116 block_length++;
1117
1118 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1119 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1120 }
1121 adjust_last_block(o, n, block_length);
1122
1123 free(pmb);
1124 }
1125
1126 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1127 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1128 static void dim_moved_lines(struct diff_options *o)
1129 {
1130 int n;
1131 for (n = 0; n < o->emitted_symbols->nr; n++) {
1132 struct emitted_diff_symbol *prev = (n != 0) ?
1133 &o->emitted_symbols->buf[n - 1] : NULL;
1134 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1135 struct emitted_diff_symbol *next =
1136 (n < o->emitted_symbols->nr - 1) ?
1137 &o->emitted_symbols->buf[n + 1] : NULL;
1138
1139 /* Not a plus or minus line? */
1140 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1141 continue;
1142
1143 /* Not a moved line? */
1144 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1145 continue;
1146
1147 /*
1148 * If prev or next are not a plus or minus line,
1149 * pretend they don't exist
1150 */
1151 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1152 prev->s != DIFF_SYMBOL_MINUS)
1153 prev = NULL;
1154 if (next && next->s != DIFF_SYMBOL_PLUS &&
1155 next->s != DIFF_SYMBOL_MINUS)
1156 next = NULL;
1157
1158 /* Inside a block? */
1159 if ((prev &&
1160 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1161 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1162 (next &&
1163 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1164 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1165 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1166 continue;
1167 }
1168
1169 /* Check if we are at an interesting bound: */
1170 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1171 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1172 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1173 continue;
1174 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1175 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1176 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1177 continue;
1178
1179 /*
1180 * The boundary to prev and next are not interesting,
1181 * so this line is not interesting as a whole
1182 */
1183 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1184 }
1185 }
1186
1187 static void emit_line_ws_markup(struct diff_options *o,
1188 const char *set, const char *reset,
1189 const char *line, int len,
1190 const char *set_sign, char sign,
1191 unsigned ws_rule, int blank_at_eof)
1192 {
1193 const char *ws = NULL;
1194
1195 if (o->ws_error_highlight & ws_rule) {
1196 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1197 if (!*ws)
1198 ws = NULL;
1199 }
1200
1201 if (!ws && !set_sign)
1202 emit_line_0(o, set, 0, reset, sign, line, len);
1203 else if (!ws) {
1204 /* Emit just the prefix, then the rest. */
1205 emit_line_0(o, set_sign, !!set_sign, reset, sign, "", 0);
1206 emit_line_0(o, set, 0, reset, 0, line, len);
1207 } else if (blank_at_eof)
1208 /* Blank line at EOF - paint '+' as well */
1209 emit_line_0(o, ws, 0, reset, sign, line, len);
1210 else {
1211 /* Emit just the prefix, then the rest. */
1212 emit_line_0(o, set_sign ? set_sign : set, !!set_sign, reset,
1213 sign, "", 0);
1214 ws_check_emit(line, len, ws_rule,
1215 o->file, set, reset, ws);
1216 }
1217 }
1218
1219 static void emit_diff_symbol_from_struct(struct diff_options *o,
1220 struct emitted_diff_symbol *eds)
1221 {
1222 static const char *nneof = " No newline at end of file\n";
1223 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1224 struct strbuf sb = STRBUF_INIT;
1225
1226 enum diff_symbol s = eds->s;
1227 const char *line = eds->line;
1228 int len = eds->len;
1229 unsigned flags = eds->flags;
1230
1231 switch (s) {
1232 case DIFF_SYMBOL_NO_LF_EOF:
1233 context = diff_get_color_opt(o, DIFF_CONTEXT);
1234 reset = diff_get_color_opt(o, DIFF_RESET);
1235 putc('\n', o->file);
1236 emit_line_0(o, context, 0, reset, '\\',
1237 nneof, strlen(nneof));
1238 break;
1239 case DIFF_SYMBOL_SUBMODULE_HEADER:
1240 case DIFF_SYMBOL_SUBMODULE_ERROR:
1241 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1242 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1243 case DIFF_SYMBOL_SUMMARY:
1244 case DIFF_SYMBOL_STATS_LINE:
1245 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1246 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1247 emit_line(o, "", "", line, len);
1248 break;
1249 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1250 case DIFF_SYMBOL_CONTEXT_MARKER:
1251 context = diff_get_color_opt(o, DIFF_CONTEXT);
1252 reset = diff_get_color_opt(o, DIFF_RESET);
1253 emit_line(o, context, reset, line, len);
1254 break;
1255 case DIFF_SYMBOL_SEPARATOR:
1256 fprintf(o->file, "%s%c",
1257 diff_line_prefix(o),
1258 o->line_termination);
1259 break;
1260 case DIFF_SYMBOL_CONTEXT:
1261 set = diff_get_color_opt(o, DIFF_CONTEXT);
1262 reset = diff_get_color_opt(o, DIFF_RESET);
1263 set_sign = NULL;
1264 if (o->flags.dual_color_diffed_diffs) {
1265 char c = !len ? 0 : line[0];
1266
1267 if (c == '+')
1268 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1269 else if (c == '@')
1270 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1271 else if (c == '-')
1272 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1273 }
1274 emit_line_ws_markup(o, set, reset, line, len, set_sign, ' ',
1275 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1276 break;
1277 case DIFF_SYMBOL_PLUS:
1278 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1279 DIFF_SYMBOL_MOVED_LINE_ALT |
1280 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1281 case DIFF_SYMBOL_MOVED_LINE |
1282 DIFF_SYMBOL_MOVED_LINE_ALT |
1283 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1284 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1285 break;
1286 case DIFF_SYMBOL_MOVED_LINE |
1287 DIFF_SYMBOL_MOVED_LINE_ALT:
1288 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1289 break;
1290 case DIFF_SYMBOL_MOVED_LINE |
1291 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1292 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1293 break;
1294 case DIFF_SYMBOL_MOVED_LINE:
1295 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1296 break;
1297 default:
1298 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1299 }
1300 reset = diff_get_color_opt(o, DIFF_RESET);
1301 if (!o->flags.dual_color_diffed_diffs)
1302 set_sign = NULL;
1303 else {
1304 char c = !len ? 0 : line[0];
1305
1306 set_sign = set;
1307 if (c == '-')
1308 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1309 else if (c == '@')
1310 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1311 else if (c == '+')
1312 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1313 else
1314 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1315 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1316 }
1317 emit_line_ws_markup(o, set, reset, line, len, set_sign, '+',
1318 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1319 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1320 break;
1321 case DIFF_SYMBOL_MINUS:
1322 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1323 DIFF_SYMBOL_MOVED_LINE_ALT |
1324 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1325 case DIFF_SYMBOL_MOVED_LINE |
1326 DIFF_SYMBOL_MOVED_LINE_ALT |
1327 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1328 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1329 break;
1330 case DIFF_SYMBOL_MOVED_LINE |
1331 DIFF_SYMBOL_MOVED_LINE_ALT:
1332 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1333 break;
1334 case DIFF_SYMBOL_MOVED_LINE |
1335 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1336 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1337 break;
1338 case DIFF_SYMBOL_MOVED_LINE:
1339 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1340 break;
1341 default:
1342 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1343 }
1344 reset = diff_get_color_opt(o, DIFF_RESET);
1345 if (!o->flags.dual_color_diffed_diffs)
1346 set_sign = NULL;
1347 else {
1348 char c = !len ? 0 : line[0];
1349
1350 set_sign = set;
1351 if (c == '+')
1352 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1353 else if (c == '@')
1354 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1355 else if (c == '-')
1356 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1357 else
1358 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1359 }
1360 emit_line_ws_markup(o, set, reset, line, len, set_sign, '-',
1361 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1362 break;
1363 case DIFF_SYMBOL_WORDS_PORCELAIN:
1364 context = diff_get_color_opt(o, DIFF_CONTEXT);
1365 reset = diff_get_color_opt(o, DIFF_RESET);
1366 emit_line(o, context, reset, line, len);
1367 fputs("~\n", o->file);
1368 break;
1369 case DIFF_SYMBOL_WORDS:
1370 context = diff_get_color_opt(o, DIFF_CONTEXT);
1371 reset = diff_get_color_opt(o, DIFF_RESET);
1372 /*
1373 * Skip the prefix character, if any. With
1374 * diff_suppress_blank_empty, there may be
1375 * none.
1376 */
1377 if (line[0] != '\n') {
1378 line++;
1379 len--;
1380 }
1381 emit_line(o, context, reset, line, len);
1382 break;
1383 case DIFF_SYMBOL_FILEPAIR_PLUS:
1384 meta = diff_get_color_opt(o, DIFF_METAINFO);
1385 reset = diff_get_color_opt(o, DIFF_RESET);
1386 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1387 line, reset,
1388 strchr(line, ' ') ? "\t" : "");
1389 break;
1390 case DIFF_SYMBOL_FILEPAIR_MINUS:
1391 meta = diff_get_color_opt(o, DIFF_METAINFO);
1392 reset = diff_get_color_opt(o, DIFF_RESET);
1393 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1394 line, reset,
1395 strchr(line, ' ') ? "\t" : "");
1396 break;
1397 case DIFF_SYMBOL_BINARY_FILES:
1398 case DIFF_SYMBOL_HEADER:
1399 fprintf(o->file, "%s", line);
1400 break;
1401 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1402 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1403 break;
1404 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1405 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1406 break;
1407 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1408 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1409 break;
1410 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1411 fputs(diff_line_prefix(o), o->file);
1412 fputc('\n', o->file);
1413 break;
1414 case DIFF_SYMBOL_REWRITE_DIFF:
1415 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1416 reset = diff_get_color_opt(o, DIFF_RESET);
1417 emit_line(o, fraginfo, reset, line, len);
1418 break;
1419 case DIFF_SYMBOL_SUBMODULE_ADD:
1420 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1421 reset = diff_get_color_opt(o, DIFF_RESET);
1422 emit_line(o, set, reset, line, len);
1423 break;
1424 case DIFF_SYMBOL_SUBMODULE_DEL:
1425 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1426 reset = diff_get_color_opt(o, DIFF_RESET);
1427 emit_line(o, set, reset, line, len);
1428 break;
1429 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1430 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1431 diff_line_prefix(o), line);
1432 break;
1433 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1434 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1435 diff_line_prefix(o), line);
1436 break;
1437 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1438 emit_line(o, "", "", " 0 files changed\n",
1439 strlen(" 0 files changed\n"));
1440 break;
1441 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1442 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1443 break;
1444 case DIFF_SYMBOL_WORD_DIFF:
1445 fprintf(o->file, "%.*s", len, line);
1446 break;
1447 case DIFF_SYMBOL_STAT_SEP:
1448 fputs(o->stat_sep, o->file);
1449 break;
1450 default:
1451 BUG("unknown diff symbol");
1452 }
1453 strbuf_release(&sb);
1454 }
1455
1456 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1457 const char *line, int len, unsigned flags)
1458 {
1459 struct emitted_diff_symbol e = {line, len, flags, s};
1460
1461 if (o->emitted_symbols)
1462 append_emitted_diff_symbol(o, &e);
1463 else
1464 emit_diff_symbol_from_struct(o, &e);
1465 }
1466
1467 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1468 {
1469 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1470 }
1471
1472 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1473 {
1474 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1475 }
1476
1477 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1478 {
1479 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1480 path, strlen(path), 0);
1481 }
1482
1483 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1484 {
1485 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1486 path, strlen(path), 0);
1487 }
1488
1489 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1490 {
1491 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1492 header, strlen(header), 0);
1493 }
1494
1495 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1496 {
1497 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1498 }
1499
1500 void diff_emit_submodule_pipethrough(struct diff_options *o,
1501 const char *line, int len)
1502 {
1503 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1504 }
1505
1506 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1507 {
1508 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1509 ecbdata->blank_at_eof_in_preimage &&
1510 ecbdata->blank_at_eof_in_postimage &&
1511 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1512 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1513 return 0;
1514 return ws_blank_line(line, len, ecbdata->ws_rule);
1515 }
1516
1517 static void emit_add_line(const char *reset,
1518 struct emit_callback *ecbdata,
1519 const char *line, int len)
1520 {
1521 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1522 if (new_blank_line_at_eof(ecbdata, line, len))
1523 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1524
1525 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1526 }
1527
1528 static void emit_del_line(const char *reset,
1529 struct emit_callback *ecbdata,
1530 const char *line, int len)
1531 {
1532 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1533 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1534 }
1535
1536 static void emit_context_line(const char *reset,
1537 struct emit_callback *ecbdata,
1538 const char *line, int len)
1539 {
1540 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1541 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1542 }
1543
1544 static void emit_hunk_header(struct emit_callback *ecbdata,
1545 const char *line, int len)
1546 {
1547 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1548 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1549 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1550 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1551 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1552 static const char atat[2] = { '@', '@' };
1553 const char *cp, *ep;
1554 struct strbuf msgbuf = STRBUF_INIT;
1555 int org_len = len;
1556 int i = 1;
1557
1558 /*
1559 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1560 * it always is at least 10 bytes long.
1561 */
1562 if (len < 10 ||
1563 memcmp(line, atat, 2) ||
1564 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1565 emit_diff_symbol(ecbdata->opt,
1566 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1567 return;
1568 }
1569 ep += 2; /* skip over @@ */
1570
1571 /* The hunk header in fraginfo color */
1572 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1573 strbuf_addstr(&msgbuf, reverse);
1574 strbuf_addstr(&msgbuf, frag);
1575 strbuf_add(&msgbuf, line, ep - line);
1576 strbuf_addstr(&msgbuf, reset);
1577
1578 /*
1579 * trailing "\r\n"
1580 */
1581 for ( ; i < 3; i++)
1582 if (line[len - i] == '\r' || line[len - i] == '\n')
1583 len--;
1584
1585 /* blank before the func header */
1586 for (cp = ep; ep - line < len; ep++)
1587 if (*ep != ' ' && *ep != '\t')
1588 break;
1589 if (ep != cp) {
1590 strbuf_addstr(&msgbuf, context);
1591 strbuf_add(&msgbuf, cp, ep - cp);
1592 strbuf_addstr(&msgbuf, reset);
1593 }
1594
1595 if (ep < line + len) {
1596 strbuf_addstr(&msgbuf, func);
1597 strbuf_add(&msgbuf, ep, line + len - ep);
1598 strbuf_addstr(&msgbuf, reset);
1599 }
1600
1601 strbuf_add(&msgbuf, line + len, org_len - len);
1602 strbuf_complete_line(&msgbuf);
1603 emit_diff_symbol(ecbdata->opt,
1604 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1605 strbuf_release(&msgbuf);
1606 }
1607
1608 static struct diff_tempfile *claim_diff_tempfile(void) {
1609 int i;
1610 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1611 if (!diff_temp[i].name)
1612 return diff_temp + i;
1613 BUG("diff is failing to clean up its tempfiles");
1614 }
1615
1616 static void remove_tempfile(void)
1617 {
1618 int i;
1619 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1620 if (is_tempfile_active(diff_temp[i].tempfile))
1621 delete_tempfile(&diff_temp[i].tempfile);
1622 diff_temp[i].name = NULL;
1623 }
1624 }
1625
1626 static void add_line_count(struct strbuf *out, int count)
1627 {
1628 switch (count) {
1629 case 0:
1630 strbuf_addstr(out, "0,0");
1631 break;
1632 case 1:
1633 strbuf_addstr(out, "1");
1634 break;
1635 default:
1636 strbuf_addf(out, "1,%d", count);
1637 break;
1638 }
1639 }
1640
1641 static void emit_rewrite_lines(struct emit_callback *ecb,
1642 int prefix, const char *data, int size)
1643 {
1644 const char *endp = NULL;
1645 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1646
1647 while (0 < size) {
1648 int len;
1649
1650 endp = memchr(data, '\n', size);
1651 len = endp ? (endp - data + 1) : size;
1652 if (prefix != '+') {
1653 ecb->lno_in_preimage++;
1654 emit_del_line(reset, ecb, data, len);
1655 } else {
1656 ecb->lno_in_postimage++;
1657 emit_add_line(reset, ecb, data, len);
1658 }
1659 size -= len;
1660 data += len;
1661 }
1662 if (!endp)
1663 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1664 }
1665
1666 static void emit_rewrite_diff(const char *name_a,
1667 const char *name_b,
1668 struct diff_filespec *one,
1669 struct diff_filespec *two,
1670 struct userdiff_driver *textconv_one,
1671 struct userdiff_driver *textconv_two,
1672 struct diff_options *o)
1673 {
1674 int lc_a, lc_b;
1675 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1676 const char *a_prefix, *b_prefix;
1677 char *data_one, *data_two;
1678 size_t size_one, size_two;
1679 struct emit_callback ecbdata;
1680 struct strbuf out = STRBUF_INIT;
1681
1682 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1683 a_prefix = o->b_prefix;
1684 b_prefix = o->a_prefix;
1685 } else {
1686 a_prefix = o->a_prefix;
1687 b_prefix = o->b_prefix;
1688 }
1689
1690 name_a += (*name_a == '/');
1691 name_b += (*name_b == '/');
1692
1693 strbuf_reset(&a_name);
1694 strbuf_reset(&b_name);
1695 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1696 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1697
1698 size_one = fill_textconv(textconv_one, one, &data_one);
1699 size_two = fill_textconv(textconv_two, two, &data_two);
1700
1701 memset(&ecbdata, 0, sizeof(ecbdata));
1702 ecbdata.color_diff = want_color(o->use_color);
1703 ecbdata.ws_rule = whitespace_rule(name_b);
1704 ecbdata.opt = o;
1705 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1706 mmfile_t mf1, mf2;
1707 mf1.ptr = (char *)data_one;
1708 mf2.ptr = (char *)data_two;
1709 mf1.size = size_one;
1710 mf2.size = size_two;
1711 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1712 }
1713 ecbdata.lno_in_preimage = 1;
1714 ecbdata.lno_in_postimage = 1;
1715
1716 lc_a = count_lines(data_one, size_one);
1717 lc_b = count_lines(data_two, size_two);
1718
1719 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1720 a_name.buf, a_name.len, 0);
1721 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1722 b_name.buf, b_name.len, 0);
1723
1724 strbuf_addstr(&out, "@@ -");
1725 if (!o->irreversible_delete)
1726 add_line_count(&out, lc_a);
1727 else
1728 strbuf_addstr(&out, "?,?");
1729 strbuf_addstr(&out, " +");
1730 add_line_count(&out, lc_b);
1731 strbuf_addstr(&out, " @@\n");
1732 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1733 strbuf_release(&out);
1734
1735 if (lc_a && !o->irreversible_delete)
1736 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1737 if (lc_b)
1738 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1739 if (textconv_one)
1740 free((char *)data_one);
1741 if (textconv_two)
1742 free((char *)data_two);
1743 }
1744
1745 struct diff_words_buffer {
1746 mmfile_t text;
1747 unsigned long alloc;
1748 struct diff_words_orig {
1749 const char *begin, *end;
1750 } *orig;
1751 int orig_nr, orig_alloc;
1752 };
1753
1754 static void diff_words_append(char *line, unsigned long len,
1755 struct diff_words_buffer *buffer)
1756 {
1757 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1758 line++;
1759 len--;
1760 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1761 buffer->text.size += len;
1762 buffer->text.ptr[buffer->text.size] = '\0';
1763 }
1764
1765 struct diff_words_style_elem {
1766 const char *prefix;
1767 const char *suffix;
1768 const char *color; /* NULL; filled in by the setup code if
1769 * color is enabled */
1770 };
1771
1772 struct diff_words_style {
1773 enum diff_words_type type;
1774 struct diff_words_style_elem new_word, old_word, ctx;
1775 const char *newline;
1776 };
1777
1778 static struct diff_words_style diff_words_styles[] = {
1779 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1780 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1781 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1782 };
1783
1784 struct diff_words_data {
1785 struct diff_words_buffer minus, plus;
1786 const char *current_plus;
1787 int last_minus;
1788 struct diff_options *opt;
1789 regex_t *word_regex;
1790 enum diff_words_type type;
1791 struct diff_words_style *style;
1792 };
1793
1794 static int fn_out_diff_words_write_helper(struct diff_options *o,
1795 struct diff_words_style_elem *st_el,
1796 const char *newline,
1797 size_t count, const char *buf)
1798 {
1799 int print = 0;
1800 struct strbuf sb = STRBUF_INIT;
1801
1802 while (count) {
1803 char *p = memchr(buf, '\n', count);
1804 if (print)
1805 strbuf_addstr(&sb, diff_line_prefix(o));
1806
1807 if (p != buf) {
1808 const char *reset = st_el->color && *st_el->color ?
1809 GIT_COLOR_RESET : NULL;
1810 if (st_el->color && *st_el->color)
1811 strbuf_addstr(&sb, st_el->color);
1812 strbuf_addstr(&sb, st_el->prefix);
1813 strbuf_add(&sb, buf, p ? p - buf : count);
1814 strbuf_addstr(&sb, st_el->suffix);
1815 if (reset)
1816 strbuf_addstr(&sb, reset);
1817 }
1818 if (!p)
1819 goto out;
1820
1821 strbuf_addstr(&sb, newline);
1822 count -= p + 1 - buf;
1823 buf = p + 1;
1824 print = 1;
1825 if (count) {
1826 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1827 sb.buf, sb.len, 0);
1828 strbuf_reset(&sb);
1829 }
1830 }
1831
1832 out:
1833 if (sb.len)
1834 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1835 sb.buf, sb.len, 0);
1836 strbuf_release(&sb);
1837 return 0;
1838 }
1839
1840 /*
1841 * '--color-words' algorithm can be described as:
1842 *
1843 * 1. collect the minus/plus lines of a diff hunk, divided into
1844 * minus-lines and plus-lines;
1845 *
1846 * 2. break both minus-lines and plus-lines into words and
1847 * place them into two mmfile_t with one word for each line;
1848 *
1849 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1850 *
1851 * And for the common parts of the both file, we output the plus side text.
1852 * diff_words->current_plus is used to trace the current position of the plus file
1853 * which printed. diff_words->last_minus is used to trace the last minus word
1854 * printed.
1855 *
1856 * For '--graph' to work with '--color-words', we need to output the graph prefix
1857 * on each line of color words output. Generally, there are two conditions on
1858 * which we should output the prefix.
1859 *
1860 * 1. diff_words->last_minus == 0 &&
1861 * diff_words->current_plus == diff_words->plus.text.ptr
1862 *
1863 * that is: the plus text must start as a new line, and if there is no minus
1864 * word printed, a graph prefix must be printed.
1865 *
1866 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1867 * *(diff_words->current_plus - 1) == '\n'
1868 *
1869 * that is: a graph prefix must be printed following a '\n'
1870 */
1871 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1872 {
1873 if ((diff_words->last_minus == 0 &&
1874 diff_words->current_plus == diff_words->plus.text.ptr) ||
1875 (diff_words->current_plus > diff_words->plus.text.ptr &&
1876 *(diff_words->current_plus - 1) == '\n')) {
1877 return 1;
1878 } else {
1879 return 0;
1880 }
1881 }
1882
1883 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1884 {
1885 struct diff_words_data *diff_words = priv;
1886 struct diff_words_style *style = diff_words->style;
1887 int minus_first, minus_len, plus_first, plus_len;
1888 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1889 struct diff_options *opt = diff_words->opt;
1890 const char *line_prefix;
1891
1892 if (line[0] != '@' || parse_hunk_header(line, len,
1893 &minus_first, &minus_len, &plus_first, &plus_len))
1894 return;
1895
1896 assert(opt);
1897 line_prefix = diff_line_prefix(opt);
1898
1899 /* POSIX requires that first be decremented by one if len == 0... */
1900 if (minus_len) {
1901 minus_begin = diff_words->minus.orig[minus_first].begin;
1902 minus_end =
1903 diff_words->minus.orig[minus_first + minus_len - 1].end;
1904 } else
1905 minus_begin = minus_end =
1906 diff_words->minus.orig[minus_first].end;
1907
1908 if (plus_len) {
1909 plus_begin = diff_words->plus.orig[plus_first].begin;
1910 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1911 } else
1912 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1913
1914 if (color_words_output_graph_prefix(diff_words)) {
1915 fputs(line_prefix, diff_words->opt->file);
1916 }
1917 if (diff_words->current_plus != plus_begin) {
1918 fn_out_diff_words_write_helper(diff_words->opt,
1919 &style->ctx, style->newline,
1920 plus_begin - diff_words->current_plus,
1921 diff_words->current_plus);
1922 }
1923 if (minus_begin != minus_end) {
1924 fn_out_diff_words_write_helper(diff_words->opt,
1925 &style->old_word, style->newline,
1926 minus_end - minus_begin, minus_begin);
1927 }
1928 if (plus_begin != plus_end) {
1929 fn_out_diff_words_write_helper(diff_words->opt,
1930 &style->new_word, style->newline,
1931 plus_end - plus_begin, plus_begin);
1932 }
1933
1934 diff_words->current_plus = plus_end;
1935 diff_words->last_minus = minus_first;
1936 }
1937
1938 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1939 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1940 int *begin, int *end)
1941 {
1942 if (word_regex && *begin < buffer->size) {
1943 regmatch_t match[1];
1944 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1945 buffer->size - *begin, 1, match, 0)) {
1946 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1947 '\n', match[0].rm_eo - match[0].rm_so);
1948 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1949 *begin += match[0].rm_so;
1950 return *begin >= *end;
1951 }
1952 return -1;
1953 }
1954
1955 /* find the next word */
1956 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1957 (*begin)++;
1958 if (*begin >= buffer->size)
1959 return -1;
1960
1961 /* find the end of the word */
1962 *end = *begin + 1;
1963 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1964 (*end)++;
1965
1966 return 0;
1967 }
1968
1969 /*
1970 * This function splits the words in buffer->text, stores the list with
1971 * newline separator into out, and saves the offsets of the original words
1972 * in buffer->orig.
1973 */
1974 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1975 regex_t *word_regex)
1976 {
1977 int i, j;
1978 long alloc = 0;
1979
1980 out->size = 0;
1981 out->ptr = NULL;
1982
1983 /* fake an empty "0th" word */
1984 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1985 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1986 buffer->orig_nr = 1;
1987
1988 for (i = 0; i < buffer->text.size; i++) {
1989 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1990 return;
1991
1992 /* store original boundaries */
1993 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1994 buffer->orig_alloc);
1995 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1996 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1997 buffer->orig_nr++;
1998
1999 /* store one word */
2000 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2001 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2002 out->ptr[out->size + j - i] = '\n';
2003 out->size += j - i + 1;
2004
2005 i = j - 1;
2006 }
2007 }
2008
2009 /* this executes the word diff on the accumulated buffers */
2010 static void diff_words_show(struct diff_words_data *diff_words)
2011 {
2012 xpparam_t xpp;
2013 xdemitconf_t xecfg;
2014 mmfile_t minus, plus;
2015 struct diff_words_style *style = diff_words->style;
2016
2017 struct diff_options *opt = diff_words->opt;
2018 const char *line_prefix;
2019
2020 assert(opt);
2021 line_prefix = diff_line_prefix(opt);
2022
2023 /* special case: only removal */
2024 if (!diff_words->plus.text.size) {
2025 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2026 line_prefix, strlen(line_prefix), 0);
2027 fn_out_diff_words_write_helper(diff_words->opt,
2028 &style->old_word, style->newline,
2029 diff_words->minus.text.size,
2030 diff_words->minus.text.ptr);
2031 diff_words->minus.text.size = 0;
2032 return;
2033 }
2034
2035 diff_words->current_plus = diff_words->plus.text.ptr;
2036 diff_words->last_minus = 0;
2037
2038 memset(&xpp, 0, sizeof(xpp));
2039 memset(&xecfg, 0, sizeof(xecfg));
2040 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2041 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2042 xpp.flags = 0;
2043 /* as only the hunk header will be parsed, we need a 0-context */
2044 xecfg.ctxlen = 0;
2045 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
2046 &xpp, &xecfg))
2047 die("unable to generate word diff");
2048 free(minus.ptr);
2049 free(plus.ptr);
2050 if (diff_words->current_plus != diff_words->plus.text.ptr +
2051 diff_words->plus.text.size) {
2052 if (color_words_output_graph_prefix(diff_words))
2053 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2054 line_prefix, strlen(line_prefix), 0);
2055 fn_out_diff_words_write_helper(diff_words->opt,
2056 &style->ctx, style->newline,
2057 diff_words->plus.text.ptr + diff_words->plus.text.size
2058 - diff_words->current_plus, diff_words->current_plus);
2059 }
2060 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2061 }
2062
2063 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2064 static void diff_words_flush(struct emit_callback *ecbdata)
2065 {
2066 struct diff_options *wo = ecbdata->diff_words->opt;
2067
2068 if (ecbdata->diff_words->minus.text.size ||
2069 ecbdata->diff_words->plus.text.size)
2070 diff_words_show(ecbdata->diff_words);
2071
2072 if (wo->emitted_symbols) {
2073 struct diff_options *o = ecbdata->opt;
2074 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2075 int i;
2076
2077 /*
2078 * NEEDSWORK:
2079 * Instead of appending each, concat all words to a line?
2080 */
2081 for (i = 0; i < wol->nr; i++)
2082 append_emitted_diff_symbol(o, &wol->buf[i]);
2083
2084 for (i = 0; i < wol->nr; i++)
2085 free((void *)wol->buf[i].line);
2086
2087 wol->nr = 0;
2088 }
2089 }
2090
2091 static void diff_filespec_load_driver(struct diff_filespec *one)
2092 {
2093 /* Use already-loaded driver */
2094 if (one->driver)
2095 return;
2096
2097 if (S_ISREG(one->mode))
2098 one->driver = userdiff_find_by_path(one->path);
2099
2100 /* Fallback to default settings */
2101 if (!one->driver)
2102 one->driver = userdiff_find_by_name("default");
2103 }
2104
2105 static const char *userdiff_word_regex(struct diff_filespec *one)
2106 {
2107 diff_filespec_load_driver(one);
2108 return one->driver->word_regex;
2109 }
2110
2111 static void init_diff_words_data(struct emit_callback *ecbdata,
2112 struct diff_options *orig_opts,
2113 struct diff_filespec *one,
2114 struct diff_filespec *two)
2115 {
2116 int i;
2117 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2118 memcpy(o, orig_opts, sizeof(struct diff_options));
2119
2120 ecbdata->diff_words =
2121 xcalloc(1, sizeof(struct diff_words_data));
2122 ecbdata->diff_words->type = o->word_diff;
2123 ecbdata->diff_words->opt = o;
2124
2125 if (orig_opts->emitted_symbols)
2126 o->emitted_symbols =
2127 xcalloc(1, sizeof(struct emitted_diff_symbols));
2128
2129 if (!o->word_regex)
2130 o->word_regex = userdiff_word_regex(one);
2131 if (!o->word_regex)
2132 o->word_regex = userdiff_word_regex(two);
2133 if (!o->word_regex)
2134 o->word_regex = diff_word_regex_cfg;
2135 if (o->word_regex) {
2136 ecbdata->diff_words->word_regex = (regex_t *)
2137 xmalloc(sizeof(regex_t));
2138 if (regcomp(ecbdata->diff_words->word_regex,
2139 o->word_regex,
2140 REG_EXTENDED | REG_NEWLINE))
2141 die ("Invalid regular expression: %s",
2142 o->word_regex);
2143 }
2144 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2145 if (o->word_diff == diff_words_styles[i].type) {
2146 ecbdata->diff_words->style =
2147 &diff_words_styles[i];
2148 break;
2149 }
2150 }
2151 if (want_color(o->use_color)) {
2152 struct diff_words_style *st = ecbdata->diff_words->style;
2153 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2154 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2155 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2156 }
2157 }
2158
2159 static void free_diff_words_data(struct emit_callback *ecbdata)
2160 {
2161 if (ecbdata->diff_words) {
2162 diff_words_flush(ecbdata);
2163 free (ecbdata->diff_words->opt->emitted_symbols);
2164 free (ecbdata->diff_words->opt);
2165 free (ecbdata->diff_words->minus.text.ptr);
2166 free (ecbdata->diff_words->minus.orig);
2167 free (ecbdata->diff_words->plus.text.ptr);
2168 free (ecbdata->diff_words->plus.orig);
2169 if (ecbdata->diff_words->word_regex) {
2170 regfree(ecbdata->diff_words->word_regex);
2171 free(ecbdata->diff_words->word_regex);
2172 }
2173 FREE_AND_NULL(ecbdata->diff_words);
2174 }
2175 }
2176
2177 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2178 {
2179 if (want_color(diff_use_color))
2180 return diff_colors[ix];
2181 return "";
2182 }
2183
2184 const char *diff_line_prefix(struct diff_options *opt)
2185 {
2186 struct strbuf *msgbuf;
2187 if (!opt->output_prefix)
2188 return "";
2189
2190 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2191 return msgbuf->buf;
2192 }
2193
2194 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2195 {
2196 const char *cp;
2197 unsigned long allot;
2198 size_t l = len;
2199
2200 cp = line;
2201 allot = l;
2202 while (0 < l) {
2203 (void) utf8_width(&cp, &l);
2204 if (!cp)
2205 break; /* truncated in the middle? */
2206 }
2207 return allot - l;
2208 }
2209
2210 static void find_lno(const char *line, struct emit_callback *ecbdata)
2211 {
2212 const char *p;
2213 ecbdata->lno_in_preimage = 0;
2214 ecbdata->lno_in_postimage = 0;
2215 p = strchr(line, '-');
2216 if (!p)
2217 return; /* cannot happen */
2218 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2219 p = strchr(p, '+');
2220 if (!p)
2221 return; /* cannot happen */
2222 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2223 }
2224
2225 static void fn_out_consume(void *priv, char *line, unsigned long len)
2226 {
2227 struct emit_callback *ecbdata = priv;
2228 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2229 struct diff_options *o = ecbdata->opt;
2230
2231 o->found_changes = 1;
2232
2233 if (ecbdata->header) {
2234 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2235 ecbdata->header->buf, ecbdata->header->len, 0);
2236 strbuf_reset(ecbdata->header);
2237 ecbdata->header = NULL;
2238 }
2239
2240 if (ecbdata->label_path[0]) {
2241 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2242 ecbdata->label_path[0],
2243 strlen(ecbdata->label_path[0]), 0);
2244 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2245 ecbdata->label_path[1],
2246 strlen(ecbdata->label_path[1]), 0);
2247 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2248 }
2249
2250 if (diff_suppress_blank_empty
2251 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2252 line[0] = '\n';
2253 len = 1;
2254 }
2255
2256 if (line[0] == '@') {
2257 if (ecbdata->diff_words)
2258 diff_words_flush(ecbdata);
2259 len = sane_truncate_line(ecbdata, line, len);
2260 find_lno(line, ecbdata);
2261 emit_hunk_header(ecbdata, line, len);
2262 return;
2263 }
2264
2265 if (ecbdata->diff_words) {
2266 enum diff_symbol s =
2267 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2268 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2269 if (line[0] == '-') {
2270 diff_words_append(line, len,
2271 &ecbdata->diff_words->minus);
2272 return;
2273 } else if (line[0] == '+') {
2274 diff_words_append(line, len,
2275 &ecbdata->diff_words->plus);
2276 return;
2277 } else if (starts_with(line, "\\ ")) {
2278 /*
2279 * Eat the "no newline at eof" marker as if we
2280 * saw a "+" or "-" line with nothing on it,
2281 * and return without diff_words_flush() to
2282 * defer processing. If this is the end of
2283 * preimage, more "+" lines may come after it.
2284 */
2285 return;
2286 }
2287 diff_words_flush(ecbdata);
2288 emit_diff_symbol(o, s, line, len, 0);
2289 return;
2290 }
2291
2292 switch (line[0]) {
2293 case '+':
2294 ecbdata->lno_in_postimage++;
2295 emit_add_line(reset, ecbdata, line + 1, len - 1);
2296 break;
2297 case '-':
2298 ecbdata->lno_in_preimage++;
2299 emit_del_line(reset, ecbdata, line + 1, len - 1);
2300 break;
2301 case ' ':
2302 ecbdata->lno_in_postimage++;
2303 ecbdata->lno_in_preimage++;
2304 emit_context_line(reset, ecbdata, line + 1, len - 1);
2305 break;
2306 default:
2307 /* incomplete line at the end */
2308 ecbdata->lno_in_preimage++;
2309 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2310 line, len, 0);
2311 break;
2312 }
2313 }
2314
2315 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2316 {
2317 const char *old_name = a;
2318 const char *new_name = b;
2319 int pfx_length, sfx_length;
2320 int pfx_adjust_for_slash;
2321 int len_a = strlen(a);
2322 int len_b = strlen(b);
2323 int a_midlen, b_midlen;
2324 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2325 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2326
2327 if (qlen_a || qlen_b) {
2328 quote_c_style(a, name, NULL, 0);
2329 strbuf_addstr(name, " => ");
2330 quote_c_style(b, name, NULL, 0);
2331 return;
2332 }
2333
2334 /* Find common prefix */
2335 pfx_length = 0;
2336 while (*old_name && *new_name && *old_name == *new_name) {
2337 if (*old_name == '/')
2338 pfx_length = old_name - a + 1;
2339 old_name++;
2340 new_name++;
2341 }
2342
2343 /* Find common suffix */
2344 old_name = a + len_a;
2345 new_name = b + len_b;
2346 sfx_length = 0;
2347 /*
2348 * If there is a common prefix, it must end in a slash. In
2349 * that case we let this loop run 1 into the prefix to see the
2350 * same slash.
2351 *
2352 * If there is no common prefix, we cannot do this as it would
2353 * underrun the input strings.
2354 */
2355 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2356 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2357 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2358 *old_name == *new_name) {
2359 if (*old_name == '/')
2360 sfx_length = len_a - (old_name - a);
2361 old_name--;
2362 new_name--;
2363 }
2364
2365 /*
2366 * pfx{mid-a => mid-b}sfx
2367 * {pfx-a => pfx-b}sfx
2368 * pfx{sfx-a => sfx-b}
2369 * name-a => name-b
2370 */
2371 a_midlen = len_a - pfx_length - sfx_length;
2372 b_midlen = len_b - pfx_length - sfx_length;
2373 if (a_midlen < 0)
2374 a_midlen = 0;
2375 if (b_midlen < 0)
2376 b_midlen = 0;
2377
2378 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2379 if (pfx_length + sfx_length) {
2380 strbuf_add(name, a, pfx_length);
2381 strbuf_addch(name, '{');
2382 }
2383 strbuf_add(name, a + pfx_length, a_midlen);
2384 strbuf_addstr(name, " => ");
2385 strbuf_add(name, b + pfx_length, b_midlen);
2386 if (pfx_length + sfx_length) {
2387 strbuf_addch(name, '}');
2388 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2389 }
2390 }
2391
2392 struct diffstat_t {
2393 int nr;
2394 int alloc;
2395 struct diffstat_file {
2396 char *from_name;
2397 char *name;
2398 char *print_name;
2399 const char *comments;
2400 unsigned is_unmerged:1;
2401 unsigned is_binary:1;
2402 unsigned is_renamed:1;
2403 unsigned is_interesting:1;
2404 uintmax_t added, deleted;
2405 } **files;
2406 };
2407
2408 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2409 const char *name_a,
2410 const char *name_b)
2411 {
2412 struct diffstat_file *x;
2413 x = xcalloc(1, sizeof(*x));
2414 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2415 diffstat->files[diffstat->nr++] = x;
2416 if (name_b) {
2417 x->from_name = xstrdup(name_a);
2418 x->name = xstrdup(name_b);
2419 x->is_renamed = 1;
2420 }
2421 else {
2422 x->from_name = NULL;
2423 x->name = xstrdup(name_a);
2424 }
2425 return x;
2426 }
2427
2428 static void diffstat_consume(void *priv, char *line, unsigned long len)
2429 {
2430 struct diffstat_t *diffstat = priv;
2431 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2432
2433 if (line[0] == '+')
2434 x->added++;
2435 else if (line[0] == '-')
2436 x->deleted++;
2437 }
2438
2439 const char mime_boundary_leader[] = "------------";
2440
2441 static int scale_linear(int it, int width, int max_change)
2442 {
2443 if (!it)
2444 return 0;
2445 /*
2446 * make sure that at least one '-' or '+' is printed if
2447 * there is any change to this path. The easiest way is to
2448 * scale linearly as if the alloted width is one column shorter
2449 * than it is, and then add 1 to the result.
2450 */
2451 return 1 + (it * (width - 1) / max_change);
2452 }
2453
2454 static void show_graph(struct strbuf *out, char ch, int cnt,
2455 const char *set, const char *reset)
2456 {
2457 if (cnt <= 0)
2458 return;
2459 strbuf_addstr(out, set);
2460 strbuf_addchars(out, ch, cnt);
2461 strbuf_addstr(out, reset);
2462 }
2463
2464 static void fill_print_name(struct diffstat_file *file)
2465 {
2466 struct strbuf pname = STRBUF_INIT;
2467
2468 if (file->print_name)
2469 return;
2470
2471 if (file->is_renamed)
2472 pprint_rename(&pname, file->from_name, file->name);
2473 else
2474 quote_c_style(file->name, &pname, NULL, 0);
2475
2476 if (file->comments)
2477 strbuf_addf(&pname, " (%s)", file->comments);
2478
2479 file->print_name = strbuf_detach(&pname, NULL);
2480 }
2481
2482 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2483 int files, int insertions, int deletions)
2484 {
2485 struct strbuf sb = STRBUF_INIT;
2486
2487 if (!files) {
2488 assert(insertions == 0 && deletions == 0);
2489 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2490 NULL, 0, 0);
2491 return;
2492 }
2493
2494 strbuf_addf(&sb,
2495 (files == 1) ? " %d file changed" : " %d files changed",
2496 files);
2497
2498 /*
2499 * For binary diff, the caller may want to print "x files
2500 * changed" with insertions == 0 && deletions == 0.
2501 *
2502 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2503 * is probably less confusing (i.e skip over "2 files changed
2504 * but nothing about added/removed lines? Is this a bug in Git?").
2505 */
2506 if (insertions || deletions == 0) {
2507 strbuf_addf(&sb,
2508 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2509 insertions);
2510 }
2511
2512 if (deletions || insertions == 0) {
2513 strbuf_addf(&sb,
2514 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2515 deletions);
2516 }
2517 strbuf_addch(&sb, '\n');
2518 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2519 sb.buf, sb.len, 0);
2520 strbuf_release(&sb);
2521 }
2522
2523 void print_stat_summary(FILE *fp, int files,
2524 int insertions, int deletions)
2525 {
2526 struct diff_options o;
2527 memset(&o, 0, sizeof(o));
2528 o.file = fp;
2529
2530 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2531 }
2532
2533 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2534 {
2535 int i, len, add, del, adds = 0, dels = 0;
2536 uintmax_t max_change = 0, max_len = 0;
2537 int total_files = data->nr, count;
2538 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2539 const char *reset, *add_c, *del_c;
2540 int extra_shown = 0;
2541 const char *line_prefix = diff_line_prefix(options);
2542 struct strbuf out = STRBUF_INIT;
2543
2544 if (data->nr == 0)
2545 return;
2546
2547 count = options->stat_count ? options->stat_count : data->nr;
2548
2549 reset = diff_get_color_opt(options, DIFF_RESET);
2550 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2551 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2552
2553 /*
2554 * Find the longest filename and max number of changes
2555 */
2556 for (i = 0; (i < count) && (i < data->nr); i++) {
2557 struct diffstat_file *file = data->files[i];
2558 uintmax_t change = file->added + file->deleted;
2559
2560 if (!file->is_interesting && (change == 0)) {
2561 count++; /* not shown == room for one more */
2562 continue;
2563 }
2564 fill_print_name(file);
2565 len = strlen(file->print_name);
2566 if (max_len < len)
2567 max_len = len;
2568
2569 if (file->is_unmerged) {
2570 /* "Unmerged" is 8 characters */
2571 bin_width = bin_width < 8 ? 8 : bin_width;
2572 continue;
2573 }
2574 if (file->is_binary) {
2575 /* "Bin XXX -> YYY bytes" */
2576 int w = 14 + decimal_width(file->added)
2577 + decimal_width(file->deleted);
2578 bin_width = bin_width < w ? w : bin_width;
2579 /* Display change counts aligned with "Bin" */
2580 number_width = 3;
2581 continue;
2582 }
2583
2584 if (max_change < change)
2585 max_change = change;
2586 }
2587 count = i; /* where we can stop scanning in data->files[] */
2588
2589 /*
2590 * We have width = stat_width or term_columns() columns total.
2591 * We want a maximum of min(max_len, stat_name_width) for the name part.
2592 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2593 * We also need 1 for " " and 4 + decimal_width(max_change)
2594 * for " | NNNN " and one the empty column at the end, altogether
2595 * 6 + decimal_width(max_change).
2596 *
2597 * If there's not enough space, we will use the smaller of
2598 * stat_name_width (if set) and 5/8*width for the filename,
2599 * and the rest for constant elements + graph part, but no more
2600 * than stat_graph_width for the graph part.
2601 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2602 * for the standard terminal size).
2603 *
2604 * In other words: stat_width limits the maximum width, and
2605 * stat_name_width fixes the maximum width of the filename,
2606 * and is also used to divide available columns if there
2607 * aren't enough.
2608 *
2609 * Binary files are displayed with "Bin XXX -> YYY bytes"
2610 * instead of the change count and graph. This part is treated
2611 * similarly to the graph part, except that it is not
2612 * "scaled". If total width is too small to accommodate the
2613 * guaranteed minimum width of the filename part and the
2614 * separators and this message, this message will "overflow"
2615 * making the line longer than the maximum width.
2616 */
2617
2618 if (options->stat_width == -1)
2619 width = term_columns() - strlen(line_prefix);
2620 else
2621 width = options->stat_width ? options->stat_width : 80;
2622 number_width = decimal_width(max_change) > number_width ?
2623 decimal_width(max_change) : number_width;
2624
2625 if (options->stat_graph_width == -1)
2626 options->stat_graph_width = diff_stat_graph_width;
2627
2628 /*
2629 * Guarantee 3/8*16==6 for the graph part
2630 * and 5/8*16==10 for the filename part
2631 */
2632 if (width < 16 + 6 + number_width)
2633 width = 16 + 6 + number_width;
2634
2635 /*
2636 * First assign sizes that are wanted, ignoring available width.
2637 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2638 * starting from "XXX" should fit in graph_width.
2639 */
2640 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2641 if (options->stat_graph_width &&
2642 options->stat_graph_width < graph_width)
2643 graph_width = options->stat_graph_width;
2644
2645 name_width = (options->stat_name_width > 0 &&
2646 options->stat_name_width < max_len) ?
2647 options->stat_name_width : max_len;
2648
2649 /*
2650 * Adjust adjustable widths not to exceed maximum width
2651 */
2652 if (name_width + number_width + 6 + graph_width > width) {
2653 if (graph_width > width * 3/8 - number_width - 6) {
2654 graph_width = width * 3/8 - number_width - 6;
2655 if (graph_width < 6)
2656 graph_width = 6;
2657 }
2658
2659 if (options->stat_graph_width &&
2660 graph_width > options->stat_graph_width)
2661 graph_width = options->stat_graph_width;
2662 if (name_width > width - number_width - 6 - graph_width)
2663 name_width = width - number_width - 6 - graph_width;
2664 else
2665 graph_width = width - number_width - 6 - name_width;
2666 }
2667
2668 /*
2669 * From here name_width is the width of the name area,
2670 * and graph_width is the width of the graph area.
2671 * max_change is used to scale graph properly.
2672 */
2673 for (i = 0; i < count; i++) {
2674 const char *prefix = "";
2675 struct diffstat_file *file = data->files[i];
2676 char *name = file->print_name;
2677 uintmax_t added = file->added;
2678 uintmax_t deleted = file->deleted;
2679 int name_len;
2680
2681 if (!file->is_interesting && (added + deleted == 0))
2682 continue;
2683
2684 /*
2685 * "scale" the filename
2686 */
2687 len = name_width;
2688 name_len = strlen(name);
2689 if (name_width < name_len) {
2690 char *slash;
2691 prefix = "...";
2692 len -= 3;
2693 name += name_len - len;
2694 slash = strchr(name, '/');
2695 if (slash)
2696 name = slash;
2697 }
2698
2699 if (file->is_binary) {
2700 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2701 strbuf_addf(&out, " %*s", number_width, "Bin");
2702 if (!added && !deleted) {
2703 strbuf_addch(&out, '\n');
2704 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2705 out.buf, out.len, 0);
2706 strbuf_reset(&out);
2707 continue;
2708 }
2709 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2710 del_c, deleted, reset);
2711 strbuf_addstr(&out, " -> ");
2712 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2713 add_c, added, reset);
2714 strbuf_addstr(&out, " bytes\n");
2715 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2716 out.buf, out.len, 0);
2717 strbuf_reset(&out);
2718 continue;
2719 }
2720 else if (file->is_unmerged) {
2721 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2722 strbuf_addstr(&out, " Unmerged\n");
2723 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2724 out.buf, out.len, 0);
2725 strbuf_reset(&out);
2726 continue;
2727 }
2728
2729 /*
2730 * scale the add/delete
2731 */
2732 add = added;
2733 del = deleted;
2734
2735 if (graph_width <= max_change) {
2736 int total = scale_linear(add + del, graph_width, max_change);
2737 if (total < 2 && add && del)
2738 /* width >= 2 due to the sanity check */
2739 total = 2;
2740 if (add < del) {
2741 add = scale_linear(add, graph_width, max_change);
2742 del = total - add;
2743 } else {
2744 del = scale_linear(del, graph_width, max_change);
2745 add = total - del;
2746 }
2747 }
2748 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2749 strbuf_addf(&out, " %*"PRIuMAX"%s",
2750 number_width, added + deleted,
2751 added + deleted ? " " : "");
2752 show_graph(&out, '+', add, add_c, reset);
2753 show_graph(&out, '-', del, del_c, reset);
2754 strbuf_addch(&out, '\n');
2755 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2756 out.buf, out.len, 0);
2757 strbuf_reset(&out);
2758 }
2759
2760 for (i = 0; i < data->nr; i++) {
2761 struct diffstat_file *file = data->files[i];
2762 uintmax_t added = file->added;
2763 uintmax_t deleted = file->deleted;
2764
2765 if (file->is_unmerged ||
2766 (!file->is_interesting && (added + deleted == 0))) {
2767 total_files--;
2768 continue;
2769 }
2770
2771 if (!file->is_binary) {
2772 adds += added;
2773 dels += deleted;
2774 }
2775 if (i < count)
2776 continue;
2777 if (!extra_shown)
2778 emit_diff_symbol(options,
2779 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2780 NULL, 0, 0);
2781 extra_shown = 1;
2782 }
2783
2784 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2785 strbuf_release(&out);
2786 }
2787
2788 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2789 {
2790 int i, adds = 0, dels = 0, total_files = data->nr;
2791
2792 if (data->nr == 0)
2793 return;
2794
2795 for (i = 0; i < data->nr; i++) {
2796 int added = data->files[i]->added;
2797 int deleted = data->files[i]->deleted;
2798
2799 if (data->files[i]->is_unmerged ||
2800 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2801 total_files--;
2802 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2803 adds += added;
2804 dels += deleted;
2805 }
2806 }
2807 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2808 }
2809
2810 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2811 {
2812 int i;
2813
2814 if (data->nr == 0)
2815 return;
2816
2817 for (i = 0; i < data->nr; i++) {
2818 struct diffstat_file *file = data->files[i];
2819
2820 fprintf(options->file, "%s", diff_line_prefix(options));
2821
2822 if (file->is_binary)
2823 fprintf(options->file, "-\t-\t");
2824 else
2825 fprintf(options->file,
2826 "%"PRIuMAX"\t%"PRIuMAX"\t",
2827 file->added, file->deleted);
2828 if (options->line_termination) {
2829 fill_print_name(file);
2830 if (!file->is_renamed)
2831 write_name_quoted(file->name, options->file,
2832 options->line_termination);
2833 else {
2834 fputs(file->print_name, options->file);
2835 putc(options->line_termination, options->file);
2836 }
2837 } else {
2838 if (file->is_renamed) {
2839 putc('\0', options->file);
2840 write_name_quoted(file->from_name, options->file, '\0');
2841 }
2842 write_name_quoted(file->name, options->file, '\0');
2843 }
2844 }
2845 }
2846
2847 struct dirstat_file {
2848 const char *name;
2849 unsigned long changed;
2850 };
2851
2852 struct dirstat_dir {
2853 struct dirstat_file *files;
2854 int alloc, nr, permille, cumulative;
2855 };
2856
2857 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2858 unsigned long changed, const char *base, int baselen)
2859 {
2860 unsigned long sum_changes = 0;
2861 unsigned int sources = 0;
2862 const char *line_prefix = diff_line_prefix(opt);
2863
2864 while (dir->nr) {
2865 struct dirstat_file *f = dir->files;
2866 int namelen = strlen(f->name);
2867 unsigned long changes;
2868 char *slash;
2869
2870 if (namelen < baselen)
2871 break;
2872 if (memcmp(f->name, base, baselen))
2873 break;
2874 slash = strchr(f->name + baselen, '/');
2875 if (slash) {
2876 int newbaselen = slash + 1 - f->name;
2877 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2878 sources++;
2879 } else {
2880 changes = f->changed;
2881 dir->files++;
2882 dir->nr--;
2883 sources += 2;
2884 }
2885 sum_changes += changes;
2886 }
2887
2888 /*
2889 * We don't report dirstat's for
2890 * - the top level
2891 * - or cases where everything came from a single directory
2892 * under this directory (sources == 1).
2893 */
2894 if (baselen && sources != 1) {
2895 if (sum_changes) {
2896 int permille = sum_changes * 1000 / changed;
2897 if (permille >= dir->permille) {
2898 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2899 permille / 10, permille % 10, baselen, base);
2900 if (!dir->cumulative)
2901 return 0;
2902 }
2903 }
2904 }
2905 return sum_changes;
2906 }
2907
2908 static int dirstat_compare(const void *_a, const void *_b)
2909 {
2910 const struct dirstat_file *a = _a;
2911 const struct dirstat_file *b = _b;
2912 return strcmp(a->name, b->name);
2913 }
2914
2915 static void show_dirstat(struct diff_options *options)
2916 {
2917 int i;
2918 unsigned long changed;
2919 struct dirstat_dir dir;
2920 struct diff_queue_struct *q = &diff_queued_diff;
2921
2922 dir.files = NULL;
2923 dir.alloc = 0;
2924 dir.nr = 0;
2925 dir.permille = options->dirstat_permille;
2926 dir.cumulative = options->flags.dirstat_cumulative;
2927
2928 changed = 0;
2929 for (i = 0; i < q->nr; i++) {
2930 struct diff_filepair *p = q->queue[i];
2931 const char *name;
2932 unsigned long copied, added, damage;
2933 int content_changed;
2934
2935 name = p->two->path ? p->two->path : p->one->path;
2936
2937 if (p->one->oid_valid && p->two->oid_valid)
2938 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2939 else
2940 content_changed = 1;
2941
2942 if (!content_changed) {
2943 /*
2944 * The SHA1 has not changed, so pre-/post-content is
2945 * identical. We can therefore skip looking at the
2946 * file contents altogether.
2947 */
2948 damage = 0;
2949 goto found_damage;
2950 }
2951
2952 if (options->flags.dirstat_by_file) {
2953 /*
2954 * In --dirstat-by-file mode, we don't really need to
2955 * look at the actual file contents at all.
2956 * The fact that the SHA1 changed is enough for us to
2957 * add this file to the list of results
2958 * (with each file contributing equal damage).
2959 */
2960 damage = 1;
2961 goto found_damage;
2962 }
2963
2964 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2965 diff_populate_filespec(p->one, 0);
2966 diff_populate_filespec(p->two, 0);
2967 diffcore_count_changes(p->one, p->two, NULL, NULL,
2968 &copied, &added);
2969 diff_free_filespec_data(p->one);
2970 diff_free_filespec_data(p->two);
2971 } else if (DIFF_FILE_VALID(p->one)) {
2972 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2973 copied = added = 0;
2974 diff_free_filespec_data(p->one);
2975 } else if (DIFF_FILE_VALID(p->two)) {
2976 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2977 copied = 0;
2978 added = p->two->size;
2979 diff_free_filespec_data(p->two);
2980 } else
2981 continue;
2982
2983 /*
2984 * Original minus copied is the removed material,
2985 * added is the new material. They are both damages
2986 * made to the preimage.
2987 * If the resulting damage is zero, we know that
2988 * diffcore_count_changes() considers the two entries to
2989 * be identical, but since content_changed is true, we
2990 * know that there must have been _some_ kind of change,
2991 * so we force all entries to have damage > 0.
2992 */
2993 damage = (p->one->size - copied) + added;
2994 if (!damage)
2995 damage = 1;
2996
2997 found_damage:
2998 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2999 dir.files[dir.nr].name = name;
3000 dir.files[dir.nr].changed = damage;
3001 changed += damage;
3002 dir.nr++;
3003 }
3004
3005 /* This can happen even with many files, if everything was renames */
3006 if (!changed)
3007 return;
3008
3009 /* Show all directories with more than x% of the changes */
3010 QSORT(dir.files, dir.nr, dirstat_compare);
3011 gather_dirstat(options, &dir, changed, "", 0);
3012 }
3013
3014 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3015 {
3016 int i;
3017 unsigned long changed;
3018 struct dirstat_dir dir;
3019
3020 if (data->nr == 0)
3021 return;
3022
3023 dir.files = NULL;
3024 dir.alloc = 0;
3025 dir.nr = 0;
3026 dir.permille = options->dirstat_permille;
3027 dir.cumulative = options->flags.dirstat_cumulative;
3028
3029 changed = 0;
3030 for (i = 0; i < data->nr; i++) {
3031 struct diffstat_file *file = data->files[i];
3032 unsigned long damage = file->added + file->deleted;
3033 if (file->is_binary)
3034 /*
3035 * binary files counts bytes, not lines. Must find some
3036 * way to normalize binary bytes vs. textual lines.
3037 * The following heuristic assumes that there are 64
3038 * bytes per "line".
3039 * This is stupid and ugly, but very cheap...
3040 */
3041 damage = DIV_ROUND_UP(damage, 64);
3042 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3043 dir.files[dir.nr].name = file->name;
3044 dir.files[dir.nr].changed = damage;
3045 changed += damage;
3046 dir.nr++;
3047 }
3048
3049 /* This can happen even with many files, if everything was renames */
3050 if (!changed)
3051 return;
3052
3053 /* Show all directories with more than x% of the changes */
3054 QSORT(dir.files, dir.nr, dirstat_compare);
3055 gather_dirstat(options, &dir, changed, "", 0);
3056 }
3057
3058 static void free_diffstat_info(struct diffstat_t *diffstat)
3059 {
3060 int i;
3061 for (i = 0; i < diffstat->nr; i++) {
3062 struct diffstat_file *f = diffstat->files[i];
3063 free(f->print_name);
3064 free(f->name);
3065 free(f->from_name);
3066 free(f);
3067 }
3068 free(diffstat->files);
3069 }
3070
3071 struct checkdiff_t {
3072 const char *filename;
3073 int lineno;
3074 int conflict_marker_size;
3075 struct diff_options *o;
3076 unsigned ws_rule;
3077 unsigned status;
3078 };
3079
3080 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3081 {
3082 char firstchar;
3083 int cnt;
3084
3085 if (len < marker_size + 1)
3086 return 0;
3087 firstchar = line[0];
3088 switch (firstchar) {
3089 case '=': case '>': case '<': case '|':
3090 break;
3091 default:
3092 return 0;
3093 }
3094 for (cnt = 1; cnt < marker_size; cnt++)
3095 if (line[cnt] != firstchar)
3096 return 0;
3097 /* line[1] thru line[marker_size-1] are same as firstchar */
3098 if (len < marker_size + 1 || !isspace(line[marker_size]))
3099 return 0;
3100 return 1;
3101 }
3102
3103 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3104 {
3105 struct checkdiff_t *data = priv;
3106 int marker_size = data->conflict_marker_size;
3107 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3108 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3109 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3110 char *err;
3111 const char *line_prefix;
3112
3113 assert(data->o);
3114 line_prefix = diff_line_prefix(data->o);
3115
3116 if (line[0] == '+') {
3117 unsigned bad;
3118 data->lineno++;
3119 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3120 data->status |= 1;
3121 fprintf(data->o->file,
3122 "%s%s:%d: leftover conflict marker\n",
3123 line_prefix, data->filename, data->lineno);
3124 }
3125 bad = ws_check(line + 1, len - 1, data->ws_rule);
3126 if (!bad)
3127 return;
3128 data->status |= bad;
3129 err = whitespace_error_string(bad);
3130 fprintf(data->o->file, "%s%s:%d: %s.\n",
3131 line_prefix, data->filename, data->lineno, err);
3132 free(err);
3133 emit_line(data->o, set, reset, line, 1);
3134 ws_check_emit(line + 1, len - 1, data->ws_rule,
3135 data->o->file, set, reset, ws);
3136 } else if (line[0] == ' ') {
3137 data->lineno++;
3138 } else if (line[0] == '@') {
3139 char *plus = strchr(line, '+');
3140 if (plus)
3141 data->lineno = strtol(plus, NULL, 10) - 1;
3142 else
3143 die("invalid diff");
3144 }
3145 }
3146
3147 static unsigned char *deflate_it(char *data,
3148 unsigned long size,
3149 unsigned long *result_size)
3150 {
3151 int bound;
3152 unsigned char *deflated;
3153 git_zstream stream;
3154
3155 git_deflate_init(&stream, zlib_compression_level);
3156 bound = git_deflate_bound(&stream, size);
3157 deflated = xmalloc(bound);
3158 stream.next_out = deflated;
3159 stream.avail_out = bound;
3160
3161 stream.next_in = (unsigned char *)data;
3162 stream.avail_in = size;
3163 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3164 ; /* nothing */
3165 git_deflate_end(&stream);
3166 *result_size = stream.total_out;
3167 return deflated;
3168 }
3169
3170 static void emit_binary_diff_body(struct diff_options *o,
3171 mmfile_t *one, mmfile_t *two)
3172 {
3173 void *cp;
3174 void *delta;
3175 void *deflated;
3176 void *data;
3177 unsigned long orig_size;
3178 unsigned long delta_size;
3179 unsigned long deflate_size;
3180 unsigned long data_size;
3181
3182 /* We could do deflated delta, or we could do just deflated two,
3183 * whichever is smaller.
3184 */
3185 delta = NULL;
3186 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3187 if (one->size && two->size) {
3188 delta = diff_delta(one->ptr, one->size,
3189 two->ptr, two->size,
3190 &delta_size, deflate_size);
3191 if (delta) {
3192 void *to_free = delta;
3193 orig_size = delta_size;
3194 delta = deflate_it(delta, delta_size, &delta_size);
3195 free(to_free);
3196 }
3197 }
3198
3199 if (delta && delta_size < deflate_size) {
3200 char *s = xstrfmt("%lu", orig_size);
3201 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3202 s, strlen(s), 0);
3203 free(s);
3204 free(deflated);
3205 data = delta;
3206 data_size = delta_size;
3207 } else {
3208 char *s = xstrfmt("%lu", two->size);
3209 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3210 s, strlen(s), 0);
3211 free(s);
3212 free(delta);
3213 data = deflated;
3214 data_size = deflate_size;
3215 }
3216
3217 /* emit data encoded in base85 */
3218 cp = data;
3219 while (data_size) {
3220 int len;
3221 int bytes = (52 < data_size) ? 52 : data_size;
3222 char line[71];
3223 data_size -= bytes;
3224 if (bytes <= 26)
3225 line[0] = bytes + 'A' - 1;
3226 else
3227 line[0] = bytes - 26 + 'a' - 1;
3228 encode_85(line + 1, cp, bytes);
3229 cp = (char *) cp + bytes;
3230
3231 len = strlen(line);
3232 line[len++] = '\n';
3233 line[len] = '\0';
3234
3235 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3236 line, len, 0);
3237 }
3238 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3239 free(data);
3240 }
3241
3242 static void emit_binary_diff(struct diff_options *o,
3243 mmfile_t *one, mmfile_t *two)
3244 {
3245 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3246 emit_binary_diff_body(o, one, two);
3247 emit_binary_diff_body(o, two, one);
3248 }
3249
3250 int diff_filespec_is_binary(struct diff_filespec *one)
3251 {
3252 if (one->is_binary == -1) {
3253 diff_filespec_load_driver(one);
3254 if (one->driver->binary != -1)
3255 one->is_binary = one->driver->binary;
3256 else {
3257 if (!one->data && DIFF_FILE_VALID(one))
3258 diff_populate_filespec(one, CHECK_BINARY);
3259 if (one->is_binary == -1 && one->data)
3260 one->is_binary = buffer_is_binary(one->data,
3261 one->size);
3262 if (one->is_binary == -1)
3263 one->is_binary = 0;
3264 }
3265 }
3266 return one->is_binary;
3267 }
3268
3269 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
3270 {
3271 diff_filespec_load_driver(one);
3272 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3273 }
3274
3275 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3276 {
3277 if (!options->a_prefix)
3278 options->a_prefix = a;
3279 if (!options->b_prefix)
3280 options->b_prefix = b;
3281 }
3282
3283 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3284 {
3285 if (!DIFF_FILE_VALID(one))
3286 return NULL;
3287
3288 diff_filespec_load_driver(one);
3289 return userdiff_get_textconv(one->driver);
3290 }
3291
3292 static void builtin_diff(const char *name_a,
3293 const char *name_b,
3294 struct diff_filespec *one,
3295 struct diff_filespec *two,
3296 const char *xfrm_msg,
3297 int must_show_header,
3298 struct diff_options *o,
3299 int complete_rewrite)
3300 {
3301 mmfile_t mf1, mf2;
3302 const char *lbl[2];
3303 char *a_one, *b_two;
3304 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3305 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3306 const char *a_prefix, *b_prefix;
3307 struct userdiff_driver *textconv_one = NULL;
3308 struct userdiff_driver *textconv_two = NULL;
3309 struct strbuf header = STRBUF_INIT;
3310 const char *line_prefix = diff_line_prefix(o);
3311
3312 diff_set_mnemonic_prefix(o, "a/", "b/");
3313 if (o->flags.reverse_diff) {
3314 a_prefix = o->b_prefix;
3315 b_prefix = o->a_prefix;
3316 } else {
3317 a_prefix = o->a_prefix;
3318 b_prefix = o->b_prefix;
3319 }
3320
3321 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3322 (!one->mode || S_ISGITLINK(one->mode)) &&
3323 (!two->mode || S_ISGITLINK(two->mode))) {
3324 show_submodule_summary(o, one->path ? one->path : two->path,
3325 &one->oid, &two->oid,
3326 two->dirty_submodule);
3327 return;
3328 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3329 (!one->mode || S_ISGITLINK(one->mode)) &&
3330 (!two->mode || S_ISGITLINK(two->mode))) {
3331 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3332 &one->oid, &two->oid,
3333 two->dirty_submodule);
3334 return;
3335 }
3336
3337 if (o->flags.allow_textconv) {
3338 textconv_one = get_textconv(one);
3339 textconv_two = get_textconv(two);
3340 }
3341
3342 /* Never use a non-valid filename anywhere if at all possible */
3343 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3344 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3345
3346 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3347 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3348 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3349 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3350 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3351 if (lbl[0][0] == '/') {
3352 /* /dev/null */
3353 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3354 if (xfrm_msg)
3355 strbuf_addstr(&header, xfrm_msg);
3356 must_show_header = 1;
3357 }
3358 else if (lbl[1][0] == '/') {
3359 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3360 if (xfrm_msg)
3361 strbuf_addstr(&header, xfrm_msg);
3362 must_show_header = 1;
3363 }
3364 else {
3365 if (one->mode != two->mode) {
3366 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3367 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3368 must_show_header = 1;
3369 }
3370 if (xfrm_msg)
3371 strbuf_addstr(&header, xfrm_msg);
3372
3373 /*
3374 * we do not run diff between different kind
3375 * of objects.
3376 */
3377 if ((one->mode ^ two->mode) & S_IFMT)
3378 goto free_ab_and_return;
3379 if (complete_rewrite &&
3380 (textconv_one || !diff_filespec_is_binary(one)) &&
3381 (textconv_two || !diff_filespec_is_binary(two))) {
3382 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3383 header.buf, header.len, 0);
3384 strbuf_reset(&header);
3385 emit_rewrite_diff(name_a, name_b, one, two,
3386 textconv_one, textconv_two, o);
3387 o->found_changes = 1;
3388 goto free_ab_and_return;
3389 }
3390 }
3391
3392 if (o->irreversible_delete && lbl[1][0] == '/') {
3393 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3394 header.len, 0);
3395 strbuf_reset(&header);
3396 goto free_ab_and_return;
3397 } else if (!o->flags.text &&
3398 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3399 (!textconv_two && diff_filespec_is_binary(two)) )) {
3400 struct strbuf sb = STRBUF_INIT;
3401 if (!one->data && !two->data &&
3402 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3403 !o->flags.binary) {
3404 if (!oidcmp(&one->oid, &two->oid)) {
3405 if (must_show_header)
3406 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3407 header.buf, header.len,
3408 0);
3409 goto free_ab_and_return;
3410 }
3411 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3412 header.buf, header.len, 0);
3413 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3414 diff_line_prefix(o), lbl[0], lbl[1]);
3415 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3416 sb.buf, sb.len, 0);
3417 strbuf_release(&sb);
3418 goto free_ab_and_return;
3419 }
3420 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3421 die("unable to read files to diff");
3422 /* Quite common confusing case */
3423 if (mf1.size == mf2.size &&
3424 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3425 if (must_show_header)
3426 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3427 header.buf, header.len, 0);
3428 goto free_ab_and_return;
3429 }
3430 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3431 strbuf_reset(&header);
3432 if (o->flags.binary)
3433 emit_binary_diff(o, &mf1, &mf2);
3434 else {
3435 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3436 diff_line_prefix(o), lbl[0], lbl[1]);
3437 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3438 sb.buf, sb.len, 0);
3439 strbuf_release(&sb);
3440 }
3441 o->found_changes = 1;
3442 } else {
3443 /* Crazy xdl interfaces.. */
3444 const char *diffopts = getenv("GIT_DIFF_OPTS");
3445 const char *v;
3446 xpparam_t xpp;
3447 xdemitconf_t xecfg;
3448 struct emit_callback ecbdata;
3449 const struct userdiff_funcname *pe;
3450
3451 if (must_show_header) {
3452 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3453 header.buf, header.len, 0);
3454 strbuf_reset(&header);
3455 }
3456
3457 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3458 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3459
3460 pe = diff_funcname_pattern(one);
3461 if (!pe)
3462 pe = diff_funcname_pattern(two);
3463
3464 memset(&xpp, 0, sizeof(xpp));
3465 memset(&xecfg, 0, sizeof(xecfg));
3466 memset(&ecbdata, 0, sizeof(ecbdata));
3467 if (o->flags.suppress_diff_headers)
3468 lbl[0] = NULL;
3469 ecbdata.label_path = lbl;
3470 ecbdata.color_diff = want_color(o->use_color);
3471 ecbdata.ws_rule = whitespace_rule(name_b);
3472 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3473 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3474 ecbdata.opt = o;
3475 if (header.len && !o->flags.suppress_diff_headers)
3476 ecbdata.header = &header;
3477 xpp.flags = o->xdl_opts;
3478 xpp.anchors = o->anchors;
3479 xpp.anchors_nr = o->anchors_nr;
3480 xecfg.ctxlen = o->context;
3481 xecfg.interhunkctxlen = o->interhunkcontext;
3482 xecfg.flags = XDL_EMIT_FUNCNAMES;
3483 if (o->flags.funccontext)
3484 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3485 if (pe)
3486 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3487 if (!diffopts)
3488 ;
3489 else if (skip_prefix(diffopts, "--unified=", &v))
3490 xecfg.ctxlen = strtoul(v, NULL, 10);
3491 else if (skip_prefix(diffopts, "-u", &v))
3492 xecfg.ctxlen = strtoul(v, NULL, 10);
3493 if (o->word_diff)
3494 init_diff_words_data(&ecbdata, o, one, two);
3495 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3496 &xpp, &xecfg))
3497 die("unable to generate diff for %s", one->path);
3498 if (o->word_diff)
3499 free_diff_words_data(&ecbdata);
3500 if (textconv_one)
3501 free(mf1.ptr);
3502 if (textconv_two)
3503 free(mf2.ptr);
3504 xdiff_clear_find_func(&xecfg);
3505 }
3506
3507 free_ab_and_return:
3508 strbuf_release(&header);
3509 diff_free_filespec_data(one);
3510 diff_free_filespec_data(two);
3511 free(a_one);
3512 free(b_two);
3513 return;
3514 }
3515
3516 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3517 {
3518 if (!is_renamed) {
3519 if (p->status == DIFF_STATUS_ADDED) {
3520 if (S_ISLNK(p->two->mode))
3521 return "new +l";
3522 else if ((p->two->mode & 0777) == 0755)
3523 return "new +x";
3524 else
3525 return "new";
3526 } else if (p->status == DIFF_STATUS_DELETED)
3527 return "gone";
3528 }
3529 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3530 return "mode -l";
3531 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3532 return "mode +l";
3533 else if ((p->one->mode & 0777) == 0644 &&
3534 (p->two->mode & 0777) == 0755)
3535 return "mode +x";
3536 else if ((p->one->mode & 0777) == 0755 &&
3537 (p->two->mode & 0777) == 0644)
3538 return "mode -x";
3539 return NULL;
3540 }
3541
3542 static void builtin_diffstat(const char *name_a, const char *name_b,
3543 struct diff_filespec *one,
3544 struct diff_filespec *two,
3545 struct diffstat_t *diffstat,
3546 struct diff_options *o,
3547 struct diff_filepair *p)
3548 {
3549 mmfile_t mf1, mf2;
3550 struct diffstat_file *data;
3551 int same_contents;
3552 int complete_rewrite = 0;
3553
3554 if (!DIFF_PAIR_UNMERGED(p)) {
3555 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3556 complete_rewrite = 1;
3557 }
3558
3559 data = diffstat_add(diffstat, name_a, name_b);
3560 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3561 if (o->flags.stat_with_summary)
3562 data->comments = get_compact_summary(p, data->is_renamed);
3563
3564 if (!one || !two) {
3565 data->is_unmerged = 1;
3566 return;
3567 }
3568
3569 same_contents = !oidcmp(&one->oid, &two->oid);
3570
3571 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3572 data->is_binary = 1;
3573 if (same_contents) {
3574 data->added = 0;
3575 data->deleted = 0;
3576 } else {
3577 data->added = diff_filespec_size(two);
3578 data->deleted = diff_filespec_size(one);
3579 }
3580 }
3581
3582 else if (complete_rewrite) {
3583 diff_populate_filespec(one, 0);
3584 diff_populate_filespec(two, 0);
3585 data->deleted = count_lines(one->data, one->size);
3586 data->added = count_lines(two->data, two->size);
3587 }
3588
3589 else if (!same_contents) {
3590 /* Crazy xdl interfaces.. */
3591 xpparam_t xpp;
3592 xdemitconf_t xecfg;
3593
3594 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3595 die("unable to read files to diff");
3596
3597 memset(&xpp, 0, sizeof(xpp));
3598 memset(&xecfg, 0, sizeof(xecfg));
3599 xpp.flags = o->xdl_opts;
3600 xpp.anchors = o->anchors;
3601 xpp.anchors_nr = o->anchors_nr;
3602 xecfg.ctxlen = o->context;
3603 xecfg.interhunkctxlen = o->interhunkcontext;
3604 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3605 &xpp, &xecfg))
3606 die("unable to generate diffstat for %s", one->path);
3607 }
3608
3609 diff_free_filespec_data(one);
3610 diff_free_filespec_data(two);
3611 }
3612
3613 static void builtin_checkdiff(const char *name_a, const char *name_b,
3614 const char *attr_path,
3615 struct diff_filespec *one,
3616 struct diff_filespec *two,
3617 struct diff_options *o)
3618 {
3619 mmfile_t mf1, mf2;
3620 struct checkdiff_t data;
3621
3622 if (!two)
3623 return;
3624
3625 memset(&data, 0, sizeof(data));
3626 data.filename = name_b ? name_b : name_a;
3627 data.lineno = 0;
3628 data.o = o;
3629 data.ws_rule = whitespace_rule(attr_path);
3630 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3631
3632 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3633 die("unable to read files to diff");
3634
3635 /*
3636 * All the other codepaths check both sides, but not checking
3637 * the "old" side here is deliberate. We are checking the newly
3638 * introduced changes, and as long as the "new" side is text, we
3639 * can and should check what it introduces.
3640 */
3641 if (diff_filespec_is_binary(two))
3642 goto free_and_return;
3643 else {
3644 /* Crazy xdl interfaces.. */
3645 xpparam_t xpp;
3646 xdemitconf_t xecfg;
3647
3648 memset(&xpp, 0, sizeof(xpp));
3649 memset(&xecfg, 0, sizeof(xecfg));
3650 xecfg.ctxlen = 1; /* at least one context line */
3651 xpp.flags = 0;
3652 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3653 &xpp, &xecfg))
3654 die("unable to generate checkdiff for %s", one->path);
3655
3656 if (data.ws_rule & WS_BLANK_AT_EOF) {
3657 struct emit_callback ecbdata;
3658 int blank_at_eof;
3659
3660 ecbdata.ws_rule = data.ws_rule;
3661 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3662 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3663
3664 if (blank_at_eof) {
3665 static char *err;
3666 if (!err)
3667 err = whitespace_error_string(WS_BLANK_AT_EOF);
3668 fprintf(o->file, "%s:%d: %s.\n",
3669 data.filename, blank_at_eof, err);
3670 data.status = 1; /* report errors */
3671 }
3672 }
3673 }
3674 free_and_return:
3675 diff_free_filespec_data(one);
3676 diff_free_filespec_data(two);
3677 if (data.status)
3678 o->flags.check_failed = 1;
3679 }
3680
3681 struct diff_filespec *alloc_filespec(const char *path)
3682 {
3683 struct diff_filespec *spec;
3684
3685 FLEXPTR_ALLOC_STR(spec, path, path);
3686 spec->count = 1;
3687 spec->is_binary = -1;
3688 return spec;
3689 }
3690
3691 void free_filespec(struct diff_filespec *spec)
3692 {
3693 if (!--spec->count) {
3694 diff_free_filespec_data(spec);
3695 free(spec);
3696 }
3697 }
3698
3699 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3700 int oid_valid, unsigned short mode)
3701 {
3702 if (mode) {
3703 spec->mode = canon_mode(mode);
3704 oidcpy(&spec->oid, oid);
3705 spec->oid_valid = oid_valid;
3706 }
3707 }
3708
3709 /*
3710 * Given a name and sha1 pair, if the index tells us the file in
3711 * the work tree has that object contents, return true, so that
3712 * prepare_temp_file() does not have to inflate and extract.
3713 */
3714 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3715 {
3716 const struct cache_entry *ce;
3717 struct stat st;
3718 int pos, len;
3719
3720 /*
3721 * We do not read the cache ourselves here, because the
3722 * benchmark with my previous version that always reads cache
3723 * shows that it makes things worse for diff-tree comparing
3724 * two linux-2.6 kernel trees in an already checked out work
3725 * tree. This is because most diff-tree comparisons deal with
3726 * only a small number of files, while reading the cache is
3727 * expensive for a large project, and its cost outweighs the
3728 * savings we get by not inflating the object to a temporary
3729 * file. Practically, this code only helps when we are used
3730 * by diff-cache --cached, which does read the cache before
3731 * calling us.
3732 */
3733 if (!active_cache)
3734 return 0;
3735
3736 /* We want to avoid the working directory if our caller
3737 * doesn't need the data in a normal file, this system
3738 * is rather slow with its stat/open/mmap/close syscalls,
3739 * and the object is contained in a pack file. The pack
3740 * is probably already open and will be faster to obtain
3741 * the data through than the working directory. Loose
3742 * objects however would tend to be slower as they need
3743 * to be individually opened and inflated.
3744 */
3745 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3746 return 0;
3747
3748 /*
3749 * Similarly, if we'd have to convert the file contents anyway, that
3750 * makes the optimization not worthwhile.
3751 */
3752 if (!want_file && would_convert_to_git(&the_index, name))
3753 return 0;
3754
3755 len = strlen(name);
3756 pos = cache_name_pos(name, len);
3757 if (pos < 0)
3758 return 0;
3759 ce = active_cache[pos];
3760
3761 /*
3762 * This is not the sha1 we are looking for, or
3763 * unreusable because it is not a regular file.
3764 */
3765 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3766 return 0;
3767
3768 /*
3769 * If ce is marked as "assume unchanged", there is no
3770 * guarantee that work tree matches what we are looking for.
3771 */
3772 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3773 return 0;
3774
3775 /*
3776 * If ce matches the file in the work tree, we can reuse it.
3777 */
3778 if (ce_uptodate(ce) ||
3779 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3780 return 1;
3781
3782 return 0;
3783 }
3784
3785 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3786 {
3787 struct strbuf buf = STRBUF_INIT;
3788 char *dirty = "";
3789
3790 /* Are we looking at the work tree? */
3791 if (s->dirty_submodule)
3792 dirty = "-dirty";
3793
3794 strbuf_addf(&buf, "Subproject commit %s%s\n",
3795 oid_to_hex(&s->oid), dirty);
3796 s->size = buf.len;
3797 if (size_only) {
3798 s->data = NULL;
3799 strbuf_release(&buf);
3800 } else {
3801 s->data = strbuf_detach(&buf, NULL);
3802 s->should_free = 1;
3803 }
3804 return 0;
3805 }
3806
3807 /*
3808 * While doing rename detection and pickaxe operation, we may need to
3809 * grab the data for the blob (or file) for our own in-core comparison.
3810 * diff_filespec has data and size fields for this purpose.
3811 */
3812 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3813 {
3814 int size_only = flags & CHECK_SIZE_ONLY;
3815 int err = 0;
3816 int conv_flags = global_conv_flags_eol;
3817 /*
3818 * demote FAIL to WARN to allow inspecting the situation
3819 * instead of refusing.
3820 */
3821 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3822 conv_flags = CONV_EOL_RNDTRP_WARN;
3823
3824 if (!DIFF_FILE_VALID(s))
3825 die("internal error: asking to populate invalid file.");
3826 if (S_ISDIR(s->mode))
3827 return -1;
3828
3829 if (s->data)
3830 return 0;
3831
3832 if (size_only && 0 < s->size)
3833 return 0;
3834
3835 if (S_ISGITLINK(s->mode))
3836 return diff_populate_gitlink(s, size_only);
3837
3838 if (!s->oid_valid ||
3839 reuse_worktree_file(s->path, &s->oid, 0)) {
3840 struct strbuf buf = STRBUF_INIT;
3841 struct stat st;
3842 int fd;
3843
3844 if (lstat(s->path, &st) < 0) {
3845 err_empty:
3846 err = -1;
3847 empty:
3848 s->data = (char *)"";
3849 s->size = 0;
3850 return err;
3851 }
3852 s->size = xsize_t(st.st_size);
3853 if (!s->size)
3854 goto empty;
3855 if (S_ISLNK(st.st_mode)) {
3856 struct strbuf sb = STRBUF_INIT;
3857
3858 if (strbuf_readlink(&sb, s->path, s->size))
3859 goto err_empty;
3860 s->size = sb.len;
3861 s->data = strbuf_detach(&sb, NULL);
3862 s->should_free = 1;
3863 return 0;
3864 }
3865
3866 /*
3867 * Even if the caller would be happy with getting
3868 * only the size, we cannot return early at this
3869 * point if the path requires us to run the content
3870 * conversion.
3871 */
3872 if (size_only && !would_convert_to_git(&the_index, s->path))
3873 return 0;
3874
3875 /*
3876 * Note: this check uses xsize_t(st.st_size) that may
3877 * not be the true size of the blob after it goes
3878 * through convert_to_git(). This may not strictly be
3879 * correct, but the whole point of big_file_threshold
3880 * and is_binary check being that we want to avoid
3881 * opening the file and inspecting the contents, this
3882 * is probably fine.
3883 */
3884 if ((flags & CHECK_BINARY) &&
3885 s->size > big_file_threshold && s->is_binary == -1) {
3886 s->is_binary = 1;
3887 return 0;
3888 }
3889 fd = open(s->path, O_RDONLY);
3890 if (fd < 0)
3891 goto err_empty;
3892 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3893 close(fd);
3894 s->should_munmap = 1;
3895
3896 /*
3897 * Convert from working tree format to canonical git format
3898 */
3899 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
3900 size_t size = 0;
3901 munmap(s->data, s->size);
3902 s->should_munmap = 0;
3903 s->data = strbuf_detach(&buf, &size);
3904 s->size = size;
3905 s->should_free = 1;
3906 }
3907 }
3908 else {
3909 enum object_type type;
3910 if (size_only || (flags & CHECK_BINARY)) {
3911 type = oid_object_info(the_repository, &s->oid,
3912 &s->size);
3913 if (type < 0)
3914 die("unable to read %s",
3915 oid_to_hex(&s->oid));
3916 if (size_only)
3917 return 0;
3918 if (s->size > big_file_threshold && s->is_binary == -1) {
3919 s->is_binary = 1;
3920 return 0;
3921 }
3922 }
3923 s->data = read_object_file(&s->oid, &type, &s->size);
3924 if (!s->data)
3925 die("unable to read %s", oid_to_hex(&s->oid));
3926 s->should_free = 1;
3927 }
3928 return 0;
3929 }
3930
3931 void diff_free_filespec_blob(struct diff_filespec *s)
3932 {
3933 if (s->should_free)
3934 free(s->data);
3935 else if (s->should_munmap)
3936 munmap(s->data, s->size);
3937
3938 if (s->should_free || s->should_munmap) {
3939 s->should_free = s->should_munmap = 0;
3940 s->data = NULL;
3941 }
3942 }
3943
3944 void diff_free_filespec_data(struct diff_filespec *s)
3945 {
3946 diff_free_filespec_blob(s);
3947 FREE_AND_NULL(s->cnt_data);
3948 }
3949
3950 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3951 void *blob,
3952 unsigned long size,
3953 const struct object_id *oid,
3954 int mode)
3955 {
3956 struct strbuf buf = STRBUF_INIT;
3957 struct strbuf tempfile = STRBUF_INIT;
3958 char *path_dup = xstrdup(path);
3959 const char *base = basename(path_dup);
3960
3961 /* Generate "XXXXXX_basename.ext" */
3962 strbuf_addstr(&tempfile, "XXXXXX_");
3963 strbuf_addstr(&tempfile, base);
3964
3965 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
3966 if (!temp->tempfile)
3967 die_errno("unable to create temp-file");
3968 if (convert_to_working_tree(path,
3969 (const char *)blob, (size_t)size, &buf)) {
3970 blob = buf.buf;
3971 size = buf.len;
3972 }
3973 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3974 close_tempfile_gently(temp->tempfile))
3975 die_errno("unable to write temp-file");
3976 temp->name = get_tempfile_path(temp->tempfile);
3977 oid_to_hex_r(temp->hex, oid);
3978 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3979 strbuf_release(&buf);
3980 strbuf_release(&tempfile);
3981 free(path_dup);
3982 }
3983
3984 static struct diff_tempfile *prepare_temp_file(const char *name,
3985 struct diff_filespec *one)
3986 {
3987 struct diff_tempfile *temp = claim_diff_tempfile();
3988
3989 if (!DIFF_FILE_VALID(one)) {
3990 not_a_valid_file:
3991 /* A '-' entry produces this for file-2, and
3992 * a '+' entry produces this for file-1.
3993 */
3994 temp->name = "/dev/null";
3995 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3996 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3997 return temp;
3998 }
3999
4000 if (!S_ISGITLINK(one->mode) &&
4001 (!one->oid_valid ||
4002 reuse_worktree_file(name, &one->oid, 1))) {
4003 struct stat st;
4004 if (lstat(name, &st) < 0) {
4005 if (errno == ENOENT)
4006 goto not_a_valid_file;
4007 die_errno("stat(%s)", name);
4008 }
4009 if (S_ISLNK(st.st_mode)) {
4010 struct strbuf sb = STRBUF_INIT;
4011 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4012 die_errno("readlink(%s)", name);
4013 prep_temp_blob(name, temp, sb.buf, sb.len,
4014 (one->oid_valid ?
4015 &one->oid : &null_oid),
4016 (one->oid_valid ?
4017 one->mode : S_IFLNK));
4018 strbuf_release(&sb);
4019 }
4020 else {
4021 /* we can borrow from the file in the work tree */
4022 temp->name = name;
4023 if (!one->oid_valid)
4024 oid_to_hex_r(temp->hex, &null_oid);
4025 else
4026 oid_to_hex_r(temp->hex, &one->oid);
4027 /* Even though we may sometimes borrow the
4028 * contents from the work tree, we always want
4029 * one->mode. mode is trustworthy even when
4030 * !(one->oid_valid), as long as
4031 * DIFF_FILE_VALID(one).
4032 */
4033 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4034 }
4035 return temp;
4036 }
4037 else {
4038 if (diff_populate_filespec(one, 0))
4039 die("cannot read data blob for %s", one->path);
4040 prep_temp_blob(name, temp, one->data, one->size,
4041 &one->oid, one->mode);
4042 }
4043 return temp;
4044 }
4045
4046 static void add_external_diff_name(struct argv_array *argv,
4047 const char *name,
4048 struct diff_filespec *df)
4049 {
4050 struct diff_tempfile *temp = prepare_temp_file(name, df);
4051 argv_array_push(argv, temp->name);
4052 argv_array_push(argv, temp->hex);
4053 argv_array_push(argv, temp->mode);
4054 }
4055
4056 /* An external diff command takes:
4057 *
4058 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4059 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4060 *
4061 */
4062 static void run_external_diff(const char *pgm,
4063 const char *name,
4064 const char *other,
4065 struct diff_filespec *one,
4066 struct diff_filespec *two,
4067 const char *xfrm_msg,
4068 int complete_rewrite,
4069 struct diff_options *o)
4070 {
4071 struct argv_array argv = ARGV_ARRAY_INIT;
4072 struct argv_array env = ARGV_ARRAY_INIT;
4073 struct diff_queue_struct *q = &diff_queued_diff;
4074
4075 argv_array_push(&argv, pgm);
4076 argv_array_push(&argv, name);
4077
4078 if (one && two) {
4079 add_external_diff_name(&argv, name, one);
4080 if (!other)
4081 add_external_diff_name(&argv, name, two);
4082 else {
4083 add_external_diff_name(&argv, other, two);
4084 argv_array_push(&argv, other);
4085 argv_array_push(&argv, xfrm_msg);
4086 }
4087 }
4088
4089 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4090 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4091
4092 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4093 die(_("external diff died, stopping at %s"), name);
4094
4095 remove_tempfile();
4096 argv_array_clear(&argv);
4097 argv_array_clear(&env);
4098 }
4099
4100 static int similarity_index(struct diff_filepair *p)
4101 {
4102 return p->score * 100 / MAX_SCORE;
4103 }
4104
4105 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4106 {
4107 if (startup_info->have_repository)
4108 return find_unique_abbrev(oid, abbrev);
4109 else {
4110 char *hex = oid_to_hex(oid);
4111 if (abbrev < 0)
4112 abbrev = FALLBACK_DEFAULT_ABBREV;
4113 if (abbrev > the_hash_algo->hexsz)
4114 BUG("oid abbreviation out of range: %d", abbrev);
4115 if (abbrev)
4116 hex[abbrev] = '\0';
4117 return hex;
4118 }
4119 }
4120
4121 static void fill_metainfo(struct strbuf *msg,
4122 const char *name,
4123 const char *other,
4124 struct diff_filespec *one,
4125 struct diff_filespec *two,
4126 struct diff_options *o,
4127 struct diff_filepair *p,
4128 int *must_show_header,
4129 int use_color)
4130 {
4131 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4132 const char *reset = diff_get_color(use_color, DIFF_RESET);
4133 const char *line_prefix = diff_line_prefix(o);
4134
4135 *must_show_header = 1;
4136 strbuf_init(msg, PATH_MAX * 2 + 300);
4137 switch (p->status) {
4138 case DIFF_STATUS_COPIED:
4139 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4140 line_prefix, set, similarity_index(p));
4141 strbuf_addf(msg, "%s\n%s%scopy from ",
4142 reset, line_prefix, set);
4143 quote_c_style(name, msg, NULL, 0);
4144 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4145 quote_c_style(other, msg, NULL, 0);
4146 strbuf_addf(msg, "%s\n", reset);
4147 break;
4148 case DIFF_STATUS_RENAMED:
4149 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4150 line_prefix, set, similarity_index(p));
4151 strbuf_addf(msg, "%s\n%s%srename from ",
4152 reset, line_prefix, set);
4153 quote_c_style(name, msg, NULL, 0);
4154 strbuf_addf(msg, "%s\n%s%srename to ",
4155 reset, line_prefix, set);
4156 quote_c_style(other, msg, NULL, 0);
4157 strbuf_addf(msg, "%s\n", reset);
4158 break;
4159 case DIFF_STATUS_MODIFIED:
4160 if (p->score) {
4161 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4162 line_prefix,
4163 set, similarity_index(p), reset);
4164 break;
4165 }
4166 /* fallthru */
4167 default:
4168 *must_show_header = 0;
4169 }
4170 if (one && two && oidcmp(&one->oid, &two->oid)) {
4171 const unsigned hexsz = the_hash_algo->hexsz;
4172 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4173
4174 if (o->flags.binary) {
4175 mmfile_t mf;
4176 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
4177 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
4178 abbrev = hexsz;
4179 }
4180 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4181 diff_abbrev_oid(&one->oid, abbrev),
4182 diff_abbrev_oid(&two->oid, abbrev));
4183 if (one->mode == two->mode)
4184 strbuf_addf(msg, " %06o", one->mode);
4185 strbuf_addf(msg, "%s\n", reset);
4186 }
4187 }
4188
4189 static void run_diff_cmd(const char *pgm,
4190 const char *name,
4191 const char *other,
4192 const char *attr_path,
4193 struct diff_filespec *one,
4194 struct diff_filespec *two,
4195 struct strbuf *msg,
4196 struct diff_options *o,
4197 struct diff_filepair *p)
4198 {
4199 const char *xfrm_msg = NULL;
4200 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4201 int must_show_header = 0;
4202
4203
4204 if (o->flags.allow_external) {
4205 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
4206 if (drv && drv->external)
4207 pgm = drv->external;
4208 }
4209
4210 if (msg) {
4211 /*
4212 * don't use colors when the header is intended for an
4213 * external diff driver
4214 */
4215 fill_metainfo(msg, name, other, one, two, o, p,
4216 &must_show_header,
4217 want_color(o->use_color) && !pgm);
4218 xfrm_msg = msg->len ? msg->buf : NULL;
4219 }
4220
4221 if (pgm) {
4222 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4223 complete_rewrite, o);
4224 return;
4225 }
4226 if (one && two)
4227 builtin_diff(name, other ? other : name,
4228 one, two, xfrm_msg, must_show_header,
4229 o, complete_rewrite);
4230 else
4231 fprintf(o->file, "* Unmerged path %s\n", name);
4232 }
4233
4234 static void diff_fill_oid_info(struct diff_filespec *one)
4235 {
4236 if (DIFF_FILE_VALID(one)) {
4237 if (!one->oid_valid) {
4238 struct stat st;
4239 if (one->is_stdin) {
4240 oidclr(&one->oid);
4241 return;
4242 }
4243 if (lstat(one->path, &st) < 0)
4244 die_errno("stat '%s'", one->path);
4245 if (index_path(&one->oid, one->path, &st, 0))
4246 die("cannot hash %s", one->path);
4247 }
4248 }
4249 else
4250 oidclr(&one->oid);
4251 }
4252
4253 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4254 {
4255 /* Strip the prefix but do not molest /dev/null and absolute paths */
4256 if (*namep && **namep != '/') {
4257 *namep += prefix_length;
4258 if (**namep == '/')
4259 ++*namep;
4260 }
4261 if (*otherp && **otherp != '/') {
4262 *otherp += prefix_length;
4263 if (**otherp == '/')
4264 ++*otherp;
4265 }
4266 }
4267
4268 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4269 {
4270 const char *pgm = external_diff();
4271 struct strbuf msg;
4272 struct diff_filespec *one = p->one;
4273 struct diff_filespec *two = p->two;
4274 const char *name;
4275 const char *other;
4276 const char *attr_path;
4277
4278 name = one->path;
4279 other = (strcmp(name, two->path) ? two->path : NULL);
4280 attr_path = name;
4281 if (o->prefix_length)
4282 strip_prefix(o->prefix_length, &name, &other);
4283
4284 if (!o->flags.allow_external)
4285 pgm = NULL;
4286
4287 if (DIFF_PAIR_UNMERGED(p)) {
4288 run_diff_cmd(pgm, name, NULL, attr_path,
4289 NULL, NULL, NULL, o, p);
4290 return;
4291 }
4292
4293 diff_fill_oid_info(one);
4294 diff_fill_oid_info(two);
4295
4296 if (!pgm &&
4297 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4298 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4299 /*
4300 * a filepair that changes between file and symlink
4301 * needs to be split into deletion and creation.
4302 */
4303 struct diff_filespec *null = alloc_filespec(two->path);
4304 run_diff_cmd(NULL, name, other, attr_path,
4305 one, null, &msg, o, p);
4306 free(null);
4307 strbuf_release(&msg);
4308
4309 null = alloc_filespec(one->path);
4310 run_diff_cmd(NULL, name, other, attr_path,
4311 null, two, &msg, o, p);
4312 free(null);
4313 }
4314 else
4315 run_diff_cmd(pgm, name, other, attr_path,
4316 one, two, &msg, o, p);
4317
4318 strbuf_release(&msg);
4319 }
4320
4321 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4322 struct diffstat_t *diffstat)
4323 {
4324 const char *name;
4325 const char *other;
4326
4327 if (DIFF_PAIR_UNMERGED(p)) {
4328 /* unmerged */
4329 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4330 return;
4331 }
4332
4333 name = p->one->path;
4334 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4335
4336 if (o->prefix_length)
4337 strip_prefix(o->prefix_length, &name, &other);
4338
4339 diff_fill_oid_info(p->one);
4340 diff_fill_oid_info(p->two);
4341
4342 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4343 }
4344
4345 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4346 {
4347 const char *name;
4348 const char *other;
4349 const char *attr_path;
4350
4351 if (DIFF_PAIR_UNMERGED(p)) {
4352 /* unmerged */
4353 return;
4354 }
4355
4356 name = p->one->path;
4357 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4358 attr_path = other ? other : name;
4359
4360 if (o->prefix_length)
4361 strip_prefix(o->prefix_length, &name, &other);
4362
4363 diff_fill_oid_info(p->one);
4364 diff_fill_oid_info(p->two);
4365
4366 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4367 }
4368
4369 void diff_setup(struct diff_options *options)
4370 {
4371 memcpy(options, &default_diff_options, sizeof(*options));
4372
4373 options->file = stdout;
4374
4375 options->abbrev = DEFAULT_ABBREV;
4376 options->line_termination = '\n';
4377 options->break_opt = -1;
4378 options->rename_limit = -1;
4379 options->dirstat_permille = diff_dirstat_permille_default;
4380 options->context = diff_context_default;
4381 options->interhunkcontext = diff_interhunk_context_default;
4382 options->ws_error_highlight = ws_error_highlight_default;
4383 options->flags.rename_empty = 1;
4384 options->objfind = NULL;
4385
4386 /* pathchange left =NULL by default */
4387 options->change = diff_change;
4388 options->add_remove = diff_addremove;
4389 options->use_color = diff_use_color_default;
4390 options->detect_rename = diff_detect_rename_default;
4391 options->xdl_opts |= diff_algorithm;
4392 if (diff_indent_heuristic)
4393 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4394
4395 options->orderfile = diff_order_file_cfg;
4396
4397 if (diff_no_prefix) {
4398 options->a_prefix = options->b_prefix = "";
4399 } else if (!diff_mnemonic_prefix) {
4400 options->a_prefix = "a/";
4401 options->b_prefix = "b/";
4402 }
4403
4404 options->color_moved = diff_color_moved_default;
4405 options->color_moved_ws_handling = diff_color_moved_ws_default;
4406 }
4407
4408 void diff_setup_done(struct diff_options *options)
4409 {
4410 unsigned check_mask = DIFF_FORMAT_NAME |
4411 DIFF_FORMAT_NAME_STATUS |
4412 DIFF_FORMAT_CHECKDIFF |
4413 DIFF_FORMAT_NO_OUTPUT;
4414 /*
4415 * This must be signed because we're comparing against a potentially
4416 * negative value.
4417 */
4418 const int hexsz = the_hash_algo->hexsz;
4419
4420 if (options->set_default)
4421 options->set_default(options);
4422
4423 if (HAS_MULTI_BITS(options->output_format & check_mask))
4424 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4425
4426 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4427 die(_("-G, -S and --find-object are mutually exclusive"));
4428
4429 /*
4430 * Most of the time we can say "there are changes"
4431 * only by checking if there are changed paths, but
4432 * --ignore-whitespace* options force us to look
4433 * inside contents.
4434 */
4435
4436 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4437 options->flags.diff_from_contents = 1;
4438 else
4439 options->flags.diff_from_contents = 0;
4440
4441 if (options->flags.find_copies_harder)
4442 options->detect_rename = DIFF_DETECT_COPY;
4443
4444 if (!options->flags.relative_name)
4445 options->prefix = NULL;
4446 if (options->prefix)
4447 options->prefix_length = strlen(options->prefix);
4448 else
4449 options->prefix_length = 0;
4450
4451 if (options->output_format & (DIFF_FORMAT_NAME |
4452 DIFF_FORMAT_NAME_STATUS |
4453 DIFF_FORMAT_CHECKDIFF |
4454 DIFF_FORMAT_NO_OUTPUT))
4455 options->output_format &= ~(DIFF_FORMAT_RAW |
4456 DIFF_FORMAT_NUMSTAT |
4457 DIFF_FORMAT_DIFFSTAT |
4458 DIFF_FORMAT_SHORTSTAT |
4459 DIFF_FORMAT_DIRSTAT |
4460 DIFF_FORMAT_SUMMARY |
4461 DIFF_FORMAT_PATCH);
4462
4463 /*
4464 * These cases always need recursive; we do not drop caller-supplied
4465 * recursive bits for other formats here.
4466 */
4467 if (options->output_format & (DIFF_FORMAT_PATCH |
4468 DIFF_FORMAT_NUMSTAT |
4469 DIFF_FORMAT_DIFFSTAT |
4470 DIFF_FORMAT_SHORTSTAT |
4471 DIFF_FORMAT_DIRSTAT |
4472 DIFF_FORMAT_SUMMARY |
4473 DIFF_FORMAT_CHECKDIFF))
4474 options->flags.recursive = 1;
4475 /*
4476 * Also pickaxe would not work very well if you do not say recursive
4477 */
4478 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4479 options->flags.recursive = 1;
4480 /*
4481 * When patches are generated, submodules diffed against the work tree
4482 * must be checked for dirtiness too so it can be shown in the output
4483 */
4484 if (options->output_format & DIFF_FORMAT_PATCH)
4485 options->flags.dirty_submodules = 1;
4486
4487 if (options->detect_rename && options->rename_limit < 0)
4488 options->rename_limit = diff_rename_limit_default;
4489 if (options->setup & DIFF_SETUP_USE_CACHE) {
4490 if (!active_cache)
4491 /* read-cache does not die even when it fails
4492 * so it is safe for us to do this here. Also
4493 * it does not smudge active_cache or active_nr
4494 * when it fails, so we do not have to worry about
4495 * cleaning it up ourselves either.
4496 */
4497 read_cache();
4498 }
4499 if (hexsz < options->abbrev)
4500 options->abbrev = hexsz; /* full */
4501
4502 /*
4503 * It does not make sense to show the first hit we happened
4504 * to have found. It does not make sense not to return with
4505 * exit code in such a case either.
4506 */
4507 if (options->flags.quick) {
4508 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4509 options->flags.exit_with_status = 1;
4510 }
4511
4512 options->diff_path_counter = 0;
4513
4514 if (options->flags.follow_renames && options->pathspec.nr != 1)
4515 die(_("--follow requires exactly one pathspec"));
4516
4517 if (!options->use_color || external_diff())
4518 options->color_moved = 0;
4519 }
4520
4521 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4522 {
4523 char c, *eq;
4524 int len;
4525
4526 if (*arg != '-')
4527 return 0;
4528 c = *++arg;
4529 if (!c)
4530 return 0;
4531 if (c == arg_short) {
4532 c = *++arg;
4533 if (!c)
4534 return 1;
4535 if (val && isdigit(c)) {
4536 char *end;
4537 int n = strtoul(arg, &end, 10);
4538 if (*end)
4539 return 0;
4540 *val = n;
4541 return 1;
4542 }
4543 return 0;
4544 }
4545 if (c != '-')
4546 return 0;
4547 arg++;
4548 eq = strchrnul(arg, '=');
4549 len = eq - arg;
4550 if (!len || strncmp(arg, arg_long, len))
4551 return 0;
4552 if (*eq) {
4553 int n;
4554 char *end;
4555 if (!isdigit(*++eq))
4556 return 0;
4557 n = strtoul(eq, &end, 10);
4558 if (*end)
4559 return 0;
4560 *val = n;
4561 }
4562 return 1;
4563 }
4564
4565 static int diff_scoreopt_parse(const char *opt);
4566
4567 static inline int short_opt(char opt, const char **argv,
4568 const char **optarg)
4569 {
4570 const char *arg = argv[0];
4571 if (arg[0] != '-' || arg[1] != opt)
4572 return 0;
4573 if (arg[2] != '\0') {
4574 *optarg = arg + 2;
4575 return 1;
4576 }
4577 if (!argv[1])
4578 die("Option '%c' requires a value", opt);
4579 *optarg = argv[1];
4580 return 2;
4581 }
4582
4583 int parse_long_opt(const char *opt, const char **argv,
4584 const char **optarg)
4585 {
4586 const char *arg = argv[0];
4587 if (!skip_prefix(arg, "--", &arg))
4588 return 0;
4589 if (!skip_prefix(arg, opt, &arg))
4590 return 0;
4591 if (*arg == '=') { /* stuck form: --option=value */
4592 *optarg = arg + 1;
4593 return 1;
4594 }
4595 if (*arg != '\0')
4596 return 0;
4597 /* separate form: --option value */
4598 if (!argv[1])
4599 die("Option '--%s' requires a value", opt);
4600 *optarg = argv[1];
4601 return 2;
4602 }
4603
4604 static int stat_opt(struct diff_options *options, const char **av)
4605 {
4606 const char *arg = av[0];
4607 char *end;
4608 int width = options->stat_width;
4609 int name_width = options->stat_name_width;
4610 int graph_width = options->stat_graph_width;
4611 int count = options->stat_count;
4612 int argcount = 1;
4613
4614 if (!skip_prefix(arg, "--stat", &arg))
4615 BUG("stat option does not begin with --stat: %s", arg);
4616 end = (char *)arg;
4617
4618 switch (*arg) {
4619 case '-':
4620 if (skip_prefix(arg, "-width", &arg)) {
4621 if (*arg == '=')
4622 width = strtoul(arg + 1, &end, 10);
4623 else if (!*arg && !av[1])
4624 die_want_option("--stat-width");
4625 else if (!*arg) {
4626 width = strtoul(av[1], &end, 10);
4627 argcount = 2;
4628 }
4629 } else if (skip_prefix(arg, "-name-width", &arg)) {
4630 if (*arg == '=')
4631 name_width = strtoul(arg + 1, &end, 10);
4632 else if (!*arg && !av[1])
4633 die_want_option("--stat-name-width");
4634 else if (!*arg) {
4635 name_width = strtoul(av[1], &end, 10);
4636 argcount = 2;
4637 }
4638 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4639 if (*arg == '=')
4640 graph_width = strtoul(arg + 1, &end, 10);
4641 else if (!*arg && !av[1])
4642 die_want_option("--stat-graph-width");
4643 else if (!*arg) {
4644 graph_width = strtoul(av[1], &end, 10);
4645 argcount = 2;
4646 }
4647 } else if (skip_prefix(arg, "-count", &arg)) {
4648 if (*arg == '=')
4649 count = strtoul(arg + 1, &end, 10);
4650 else if (!*arg && !av[1])
4651 die_want_option("--stat-count");
4652 else if (!*arg) {
4653 count = strtoul(av[1], &end, 10);
4654 argcount = 2;
4655 }
4656 }
4657 break;
4658 case '=':
4659 width = strtoul(arg+1, &end, 10);
4660 if (*end == ',')
4661 name_width = strtoul(end+1, &end, 10);
4662 if (*end == ',')
4663 count = strtoul(end+1, &end, 10);
4664 }
4665
4666 /* Important! This checks all the error cases! */
4667 if (*end)
4668 return 0;
4669 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4670 options->stat_name_width = name_width;
4671 options->stat_graph_width = graph_width;
4672 options->stat_width = width;
4673 options->stat_count = count;
4674 return argcount;
4675 }
4676
4677 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4678 {
4679 struct strbuf errmsg = STRBUF_INIT;
4680 if (parse_dirstat_params(options, params, &errmsg))
4681 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4682 errmsg.buf);
4683 strbuf_release(&errmsg);
4684 /*
4685 * The caller knows a dirstat-related option is given from the command
4686 * line; allow it to say "return this_function();"
4687 */
4688 options->output_format |= DIFF_FORMAT_DIRSTAT;
4689 return 1;
4690 }
4691
4692 static int parse_submodule_opt(struct diff_options *options, const char *value)
4693 {
4694 if (parse_submodule_params(options, value))
4695 die(_("Failed to parse --submodule option parameter: '%s'"),
4696 value);
4697 return 1;
4698 }
4699
4700 static const char diff_status_letters[] = {
4701 DIFF_STATUS_ADDED,
4702 DIFF_STATUS_COPIED,
4703 DIFF_STATUS_DELETED,
4704 DIFF_STATUS_MODIFIED,
4705 DIFF_STATUS_RENAMED,
4706 DIFF_STATUS_TYPE_CHANGED,
4707 DIFF_STATUS_UNKNOWN,
4708 DIFF_STATUS_UNMERGED,
4709 DIFF_STATUS_FILTER_AON,
4710 DIFF_STATUS_FILTER_BROKEN,
4711 '\0',
4712 };
4713
4714 static unsigned int filter_bit['Z' + 1];
4715
4716 static void prepare_filter_bits(void)
4717 {
4718 int i;
4719
4720 if (!filter_bit[DIFF_STATUS_ADDED]) {
4721 for (i = 0; diff_status_letters[i]; i++)
4722 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4723 }
4724 }
4725
4726 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4727 {
4728 return opt->filter & filter_bit[(int) status];
4729 }
4730
4731 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4732 {
4733 int i, optch;
4734
4735 prepare_filter_bits();
4736
4737 /*
4738 * If there is a negation e.g. 'd' in the input, and we haven't
4739 * initialized the filter field with another --diff-filter, start
4740 * from full set of bits, except for AON.
4741 */
4742 if (!opt->filter) {
4743 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4744 if (optch < 'a' || 'z' < optch)
4745 continue;
4746 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4747 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4748 break;
4749 }
4750 }
4751
4752 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4753 unsigned int bit;
4754 int negate;
4755
4756 if ('a' <= optch && optch <= 'z') {
4757 negate = 1;
4758 optch = toupper(optch);
4759 } else {
4760 negate = 0;
4761 }
4762
4763 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4764 if (!bit)
4765 return optarg[i];
4766 if (negate)
4767 opt->filter &= ~bit;
4768 else
4769 opt->filter |= bit;
4770 }
4771 return 0;
4772 }
4773
4774 static void enable_patch_output(int *fmt) {
4775 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4776 *fmt |= DIFF_FORMAT_PATCH;
4777 }
4778
4779 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4780 {
4781 int val = parse_ws_error_highlight(arg);
4782
4783 if (val < 0) {
4784 error("unknown value after ws-error-highlight=%.*s",
4785 -1 - val, arg);
4786 return 0;
4787 }
4788 opt->ws_error_highlight = val;
4789 return 1;
4790 }
4791
4792 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4793 {
4794 struct object_id oid;
4795
4796 if (get_oid(arg, &oid))
4797 return error("unable to resolve '%s'", arg);
4798
4799 if (!opt->objfind)
4800 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4801
4802 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4803 opt->flags.recursive = 1;
4804 opt->flags.tree_in_recursive = 1;
4805 oidset_insert(opt->objfind, &oid);
4806 return 1;
4807 }
4808
4809 int diff_opt_parse(struct diff_options *options,
4810 const char **av, int ac, const char *prefix)
4811 {
4812 const char *arg = av[0];
4813 const char *optarg;
4814 int argcount;
4815
4816 if (!prefix)
4817 prefix = "";
4818
4819 /* Output format options */
4820 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4821 || opt_arg(arg, 'U', "unified", &options->context))
4822 enable_patch_output(&options->output_format);
4823 else if (!strcmp(arg, "--raw"))
4824 options->output_format |= DIFF_FORMAT_RAW;
4825 else if (!strcmp(arg, "--patch-with-raw")) {
4826 enable_patch_output(&options->output_format);
4827 options->output_format |= DIFF_FORMAT_RAW;
4828 } else if (!strcmp(arg, "--numstat"))
4829 options->output_format |= DIFF_FORMAT_NUMSTAT;
4830 else if (!strcmp(arg, "--shortstat"))
4831 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4832 else if (skip_prefix(arg, "-X", &arg) ||
4833 skip_to_optional_arg(arg, "--dirstat", &arg))
4834 return parse_dirstat_opt(options, arg);
4835 else if (!strcmp(arg, "--cumulative"))
4836 return parse_dirstat_opt(options, "cumulative");
4837 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4838 parse_dirstat_opt(options, "files");
4839 return parse_dirstat_opt(options, arg);
4840 }
4841 else if (!strcmp(arg, "--check"))
4842 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4843 else if (!strcmp(arg, "--summary"))
4844 options->output_format |= DIFF_FORMAT_SUMMARY;
4845 else if (!strcmp(arg, "--patch-with-stat")) {
4846 enable_patch_output(&options->output_format);
4847 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4848 } else if (!strcmp(arg, "--name-only"))
4849 options->output_format |= DIFF_FORMAT_NAME;
4850 else if (!strcmp(arg, "--name-status"))
4851 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4852 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4853 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4854 else if (starts_with(arg, "--stat"))
4855 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4856 return stat_opt(options, av);
4857 else if (!strcmp(arg, "--compact-summary")) {
4858 options->flags.stat_with_summary = 1;
4859 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4860 } else if (!strcmp(arg, "--no-compact-summary"))
4861 options->flags.stat_with_summary = 0;
4862
4863 /* renames options */
4864 else if (starts_with(arg, "-B") ||
4865 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4866 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4867 return error("invalid argument to -B: %s", arg+2);
4868 }
4869 else if (starts_with(arg, "-M") ||
4870 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4871 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4872 return error("invalid argument to -M: %s", arg+2);
4873 options->detect_rename = DIFF_DETECT_RENAME;
4874 }
4875 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4876 options->irreversible_delete = 1;
4877 }
4878 else if (starts_with(arg, "-C") ||
4879 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4880 if (options->detect_rename == DIFF_DETECT_COPY)
4881 options->flags.find_copies_harder = 1;
4882 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4883 return error("invalid argument to -C: %s", arg+2);
4884 options->detect_rename = DIFF_DETECT_COPY;
4885 }
4886 else if (!strcmp(arg, "--no-renames"))
4887 options->detect_rename = 0;
4888 else if (!strcmp(arg, "--rename-empty"))
4889 options->flags.rename_empty = 1;
4890 else if (!strcmp(arg, "--no-rename-empty"))
4891 options->flags.rename_empty = 0;
4892 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4893 options->flags.relative_name = 1;
4894 if (arg)
4895 options->prefix = arg;
4896 }
4897
4898 /* xdiff options */
4899 else if (!strcmp(arg, "--minimal"))
4900 DIFF_XDL_SET(options, NEED_MINIMAL);
4901 else if (!strcmp(arg, "--no-minimal"))
4902 DIFF_XDL_CLR(options, NEED_MINIMAL);
4903 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4904 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4905 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4906 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4907 else if (!strcmp(arg, "--ignore-space-at-eol"))
4908 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4909 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4910 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4911 else if (!strcmp(arg, "--ignore-blank-lines"))
4912 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4913 else if (!strcmp(arg, "--indent-heuristic"))
4914 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4915 else if (!strcmp(arg, "--no-indent-heuristic"))
4916 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4917 else if (!strcmp(arg, "--patience")) {
4918 int i;
4919 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4920 /*
4921 * Both --patience and --anchored use PATIENCE_DIFF
4922 * internally, so remove any anchors previously
4923 * specified.
4924 */
4925 for (i = 0; i < options->anchors_nr; i++)
4926 free(options->anchors[i]);
4927 options->anchors_nr = 0;
4928 } else if (!strcmp(arg, "--histogram"))
4929 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4930 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4931 long value = parse_algorithm_value(optarg);
4932 if (value < 0)
4933 return error("option diff-algorithm accepts \"myers\", "
4934 "\"minimal\", \"patience\" and \"histogram\"");
4935 /* clear out previous settings */
4936 DIFF_XDL_CLR(options, NEED_MINIMAL);
4937 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4938 options->xdl_opts |= value;
4939 return argcount;
4940 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4941 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4942 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4943 options->anchors_alloc);
4944 options->anchors[options->anchors_nr++] = xstrdup(arg);
4945 }
4946
4947 /* flags options */
4948 else if (!strcmp(arg, "--binary")) {
4949 enable_patch_output(&options->output_format);
4950 options->flags.binary = 1;
4951 }
4952 else if (!strcmp(arg, "--full-index"))
4953 options->flags.full_index = 1;
4954 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4955 options->flags.text = 1;
4956 else if (!strcmp(arg, "-R"))
4957 options->flags.reverse_diff = 1;
4958 else if (!strcmp(arg, "--find-copies-harder"))
4959 options->flags.find_copies_harder = 1;
4960 else if (!strcmp(arg, "--follow"))
4961 options->flags.follow_renames = 1;
4962 else if (!strcmp(arg, "--no-follow")) {
4963 options->flags.follow_renames = 0;
4964 options->flags.default_follow_renames = 0;
4965 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
4966 int value = git_config_colorbool(NULL, arg);
4967 if (value < 0)
4968 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4969 options->use_color = value;
4970 }
4971 else if (!strcmp(arg, "--no-color"))
4972 options->use_color = 0;
4973 else if (!strcmp(arg, "--color-moved")) {
4974 if (diff_color_moved_default)
4975 options->color_moved = diff_color_moved_default;
4976 if (options->color_moved == COLOR_MOVED_NO)
4977 options->color_moved = COLOR_MOVED_DEFAULT;
4978 } else if (!strcmp(arg, "--no-color-moved"))
4979 options->color_moved = COLOR_MOVED_NO;
4980 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4981 int cm = parse_color_moved(arg);
4982 if (cm < 0)
4983 die("bad --color-moved argument: %s", arg);
4984 options->color_moved = cm;
4985 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
4986 options->color_moved_ws_handling = parse_color_moved_ws(arg);
4987 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
4988 options->use_color = 1;
4989 options->word_diff = DIFF_WORDS_COLOR;
4990 }
4991 else if (!strcmp(arg, "--word-diff")) {
4992 if (options->word_diff == DIFF_WORDS_NONE)
4993 options->word_diff = DIFF_WORDS_PLAIN;
4994 }
4995 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4996 if (!strcmp(arg, "plain"))
4997 options->word_diff = DIFF_WORDS_PLAIN;
4998 else if (!strcmp(arg, "color")) {
4999 options->use_color = 1;
5000 options->word_diff = DIFF_WORDS_COLOR;
5001 }
5002 else if (!strcmp(arg, "porcelain"))
5003 options->word_diff = DIFF_WORDS_PORCELAIN;
5004 else if (!strcmp(arg, "none"))
5005 options->word_diff = DIFF_WORDS_NONE;
5006 else
5007 die("bad --word-diff argument: %s", arg);
5008 }
5009 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5010 if (options->word_diff == DIFF_WORDS_NONE)
5011 options->word_diff = DIFF_WORDS_PLAIN;
5012 options->word_regex = optarg;
5013 return argcount;
5014 }
5015 else if (!strcmp(arg, "--exit-code"))
5016 options->flags.exit_with_status = 1;
5017 else if (!strcmp(arg, "--quiet"))
5018 options->flags.quick = 1;
5019 else if (!strcmp(arg, "--ext-diff"))
5020 options->flags.allow_external = 1;
5021 else if (!strcmp(arg, "--no-ext-diff"))
5022 options->flags.allow_external = 0;
5023 else if (!strcmp(arg, "--textconv")) {
5024 options->flags.allow_textconv = 1;
5025 options->flags.textconv_set_via_cmdline = 1;
5026 } else if (!strcmp(arg, "--no-textconv"))
5027 options->flags.allow_textconv = 0;
5028 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5029 options->flags.override_submodule_config = 1;
5030 handle_ignore_submodules_arg(options, arg);
5031 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5032 return parse_submodule_opt(options, arg);
5033 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5034 return parse_ws_error_highlight_opt(options, arg);
5035 else if (!strcmp(arg, "--ita-invisible-in-index"))
5036 options->ita_invisible_in_index = 1;
5037 else if (!strcmp(arg, "--ita-visible-in-index"))
5038 options->ita_invisible_in_index = 0;
5039
5040 /* misc options */
5041 else if (!strcmp(arg, "-z"))
5042 options->line_termination = 0;
5043 else if ((argcount = short_opt('l', av, &optarg))) {
5044 options->rename_limit = strtoul(optarg, NULL, 10);
5045 return argcount;
5046 }
5047 else if ((argcount = short_opt('S', av, &optarg))) {
5048 options->pickaxe = optarg;
5049 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5050 return argcount;
5051 } else if ((argcount = short_opt('G', av, &optarg))) {
5052 options->pickaxe = optarg;
5053 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5054 return argcount;
5055 }
5056 else if (!strcmp(arg, "--pickaxe-all"))
5057 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5058 else if (!strcmp(arg, "--pickaxe-regex"))
5059 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5060 else if ((argcount = short_opt('O', av, &optarg))) {
5061 options->orderfile = prefix_filename(prefix, optarg);
5062 return argcount;
5063 } else if (skip_prefix(arg, "--find-object=", &arg))
5064 return parse_objfind_opt(options, arg);
5065 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5066 int offending = parse_diff_filter_opt(optarg, options);
5067 if (offending)
5068 die("unknown change class '%c' in --diff-filter=%s",
5069 offending, optarg);
5070 return argcount;
5071 }
5072 else if (!strcmp(arg, "--no-abbrev"))
5073 options->abbrev = 0;
5074 else if (!strcmp(arg, "--abbrev"))
5075 options->abbrev = DEFAULT_ABBREV;
5076 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5077 options->abbrev = strtoul(arg, NULL, 10);
5078 if (options->abbrev < MINIMUM_ABBREV)
5079 options->abbrev = MINIMUM_ABBREV;
5080 else if (the_hash_algo->hexsz < options->abbrev)
5081 options->abbrev = the_hash_algo->hexsz;
5082 }
5083 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5084 options->a_prefix = optarg;
5085 return argcount;
5086 }
5087 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5088 options->line_prefix = optarg;
5089 options->line_prefix_length = strlen(options->line_prefix);
5090 graph_setup_line_prefix(options);
5091 return argcount;
5092 }
5093 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5094 options->b_prefix = optarg;
5095 return argcount;
5096 }
5097 else if (!strcmp(arg, "--no-prefix"))
5098 options->a_prefix = options->b_prefix = "";
5099 else if (opt_arg(arg, '\0', "inter-hunk-context",
5100 &options->interhunkcontext))
5101 ;
5102 else if (!strcmp(arg, "-W"))
5103 options->flags.funccontext = 1;
5104 else if (!strcmp(arg, "--function-context"))
5105 options->flags.funccontext = 1;
5106 else if (!strcmp(arg, "--no-function-context"))
5107 options->flags.funccontext = 0;
5108 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5109 char *path = prefix_filename(prefix, optarg);
5110 options->file = xfopen(path, "w");
5111 options->close_file = 1;
5112 if (options->use_color != GIT_COLOR_ALWAYS)
5113 options->use_color = GIT_COLOR_NEVER;
5114 free(path);
5115 return argcount;
5116 } else
5117 return 0;
5118 return 1;
5119 }
5120
5121 int parse_rename_score(const char **cp_p)
5122 {
5123 unsigned long num, scale;
5124 int ch, dot;
5125 const char *cp = *cp_p;
5126
5127 num = 0;
5128 scale = 1;
5129 dot = 0;
5130 for (;;) {
5131 ch = *cp;
5132 if ( !dot && ch == '.' ) {
5133 scale = 1;
5134 dot = 1;
5135 } else if ( ch == '%' ) {
5136 scale = dot ? scale*100 : 100;
5137 cp++; /* % is always at the end */
5138 break;
5139 } else if ( ch >= '0' && ch <= '9' ) {
5140 if ( scale < 100000 ) {
5141 scale *= 10;
5142 num = (num*10) + (ch-'0');
5143 }
5144 } else {
5145 break;
5146 }
5147 cp++;
5148 }
5149 *cp_p = cp;
5150
5151 /* user says num divided by scale and we say internally that
5152 * is MAX_SCORE * num / scale.
5153 */
5154 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5155 }
5156
5157 static int diff_scoreopt_parse(const char *opt)
5158 {
5159 int opt1, opt2, cmd;
5160
5161 if (*opt++ != '-')
5162 return -1;
5163 cmd = *opt++;
5164 if (cmd == '-') {
5165 /* convert the long-form arguments into short-form versions */
5166 if (skip_prefix(opt, "break-rewrites", &opt)) {
5167 if (*opt == 0 || *opt++ == '=')
5168 cmd = 'B';
5169 } else if (skip_prefix(opt, "find-copies", &opt)) {
5170 if (*opt == 0 || *opt++ == '=')
5171 cmd = 'C';
5172 } else if (skip_prefix(opt, "find-renames", &opt)) {
5173 if (*opt == 0 || *opt++ == '=')
5174 cmd = 'M';
5175 }
5176 }
5177 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5178 return -1; /* that is not a -M, -C, or -B option */
5179
5180 opt1 = parse_rename_score(&opt);
5181 if (cmd != 'B')
5182 opt2 = 0;
5183 else {
5184 if (*opt == 0)
5185 opt2 = 0;
5186 else if (*opt != '/')
5187 return -1; /* we expect -B80/99 or -B80 */
5188 else {
5189 opt++;
5190 opt2 = parse_rename_score(&opt);
5191 }
5192 }
5193 if (*opt != 0)
5194 return -1;
5195 return opt1 | (opt2 << 16);
5196 }
5197
5198 struct diff_queue_struct diff_queued_diff;
5199
5200 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5201 {
5202 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5203 queue->queue[queue->nr++] = dp;
5204 }
5205
5206 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5207 struct diff_filespec *one,
5208 struct diff_filespec *two)
5209 {
5210 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5211 dp->one = one;
5212 dp->two = two;
5213 if (queue)
5214 diff_q(queue, dp);
5215 return dp;
5216 }
5217
5218 void diff_free_filepair(struct diff_filepair *p)
5219 {
5220 free_filespec(p->one);
5221 free_filespec(p->two);
5222 free(p);
5223 }
5224
5225 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5226 {
5227 int abblen;
5228 const char *abbrev;
5229
5230 /* Do we want all 40 hex characters? */
5231 if (len == the_hash_algo->hexsz)
5232 return oid_to_hex(oid);
5233
5234 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5235 abbrev = diff_abbrev_oid(oid, len);
5236
5237 if (!print_sha1_ellipsis())
5238 return abbrev;
5239
5240 abblen = strlen(abbrev);
5241
5242 /*
5243 * In well-behaved cases, where the abbreviated result is the
5244 * same as the requested length, append three dots after the
5245 * abbreviation (hence the whole logic is limited to the case
5246 * where abblen < 37); when the actual abbreviated result is a
5247 * bit longer than the requested length, we reduce the number
5248 * of dots so that they match the well-behaved ones. However,
5249 * if the actual abbreviation is longer than the requested
5250 * length by more than three, we give up on aligning, and add
5251 * three dots anyway, to indicate that the output is not the
5252 * full object name. Yes, this may be suboptimal, but this
5253 * appears only in "diff --raw --abbrev" output and it is not
5254 * worth the effort to change it now. Note that this would
5255 * likely to work fine when the automatic sizing of default
5256 * abbreviation length is used--we would be fed -1 in "len" in
5257 * that case, and will end up always appending three-dots, but
5258 * the automatic sizing is supposed to give abblen that ensures
5259 * uniqueness across all objects (statistically speaking).
5260 */
5261 if (abblen < the_hash_algo->hexsz - 3) {
5262 static char hex[GIT_MAX_HEXSZ + 1];
5263 if (len < abblen && abblen <= len + 2)
5264 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5265 else
5266 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5267 return hex;
5268 }
5269
5270 return oid_to_hex(oid);
5271 }
5272
5273 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5274 {
5275 int line_termination = opt->line_termination;
5276 int inter_name_termination = line_termination ? '\t' : '\0';
5277
5278 fprintf(opt->file, "%s", diff_line_prefix(opt));
5279 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5280 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5281 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5282 fprintf(opt->file, "%s ",
5283 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5284 }
5285 if (p->score) {
5286 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5287 inter_name_termination);
5288 } else {
5289 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5290 }
5291
5292 if (p->status == DIFF_STATUS_COPIED ||
5293 p->status == DIFF_STATUS_RENAMED) {
5294 const char *name_a, *name_b;
5295 name_a = p->one->path;
5296 name_b = p->two->path;
5297 strip_prefix(opt->prefix_length, &name_a, &name_b);
5298 write_name_quoted(name_a, opt->file, inter_name_termination);
5299 write_name_quoted(name_b, opt->file, line_termination);
5300 } else {
5301 const char *name_a, *name_b;
5302 name_a = p->one->mode ? p->one->path : p->two->path;
5303 name_b = NULL;
5304 strip_prefix(opt->prefix_length, &name_a, &name_b);
5305 write_name_quoted(name_a, opt->file, line_termination);
5306 }
5307 }
5308
5309 int diff_unmodified_pair(struct diff_filepair *p)
5310 {
5311 /* This function is written stricter than necessary to support
5312 * the currently implemented transformers, but the idea is to
5313 * let transformers to produce diff_filepairs any way they want,
5314 * and filter and clean them up here before producing the output.
5315 */
5316 struct diff_filespec *one = p->one, *two = p->two;
5317
5318 if (DIFF_PAIR_UNMERGED(p))
5319 return 0; /* unmerged is interesting */
5320
5321 /* deletion, addition, mode or type change
5322 * and rename are all interesting.
5323 */
5324 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5325 DIFF_PAIR_MODE_CHANGED(p) ||
5326 strcmp(one->path, two->path))
5327 return 0;
5328
5329 /* both are valid and point at the same path. that is, we are
5330 * dealing with a change.
5331 */
5332 if (one->oid_valid && two->oid_valid &&
5333 !oidcmp(&one->oid, &two->oid) &&
5334 !one->dirty_submodule && !two->dirty_submodule)
5335 return 1; /* no change */
5336 if (!one->oid_valid && !two->oid_valid)
5337 return 1; /* both look at the same file on the filesystem. */
5338 return 0;
5339 }
5340
5341 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5342 {
5343 if (diff_unmodified_pair(p))
5344 return;
5345
5346 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5347 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5348 return; /* no tree diffs in patch format */
5349
5350 run_diff(p, o);
5351 }
5352
5353 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5354 struct diffstat_t *diffstat)
5355 {
5356 if (diff_unmodified_pair(p))
5357 return;
5358
5359 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5360 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5361 return; /* no useful stat for tree diffs */
5362
5363 run_diffstat(p, o, diffstat);
5364 }
5365
5366 static void diff_flush_checkdiff(struct diff_filepair *p,
5367 struct diff_options *o)
5368 {
5369 if (diff_unmodified_pair(p))
5370 return;
5371
5372 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5373 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5374 return; /* nothing to check in tree diffs */
5375
5376 run_checkdiff(p, o);
5377 }
5378
5379 int diff_queue_is_empty(void)
5380 {
5381 struct diff_queue_struct *q = &diff_queued_diff;
5382 int i;
5383 for (i = 0; i < q->nr; i++)
5384 if (!diff_unmodified_pair(q->queue[i]))
5385 return 0;
5386 return 1;
5387 }
5388
5389 #if DIFF_DEBUG
5390 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5391 {
5392 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5393 x, one ? one : "",
5394 s->path,
5395 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5396 s->mode,
5397 s->oid_valid ? oid_to_hex(&s->oid) : "");
5398 fprintf(stderr, "queue[%d] %s size %lu\n",
5399 x, one ? one : "",
5400 s->size);
5401 }
5402
5403 void diff_debug_filepair(const struct diff_filepair *p, int i)
5404 {
5405 diff_debug_filespec(p->one, i, "one");
5406 diff_debug_filespec(p->two, i, "two");
5407 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5408 p->score, p->status ? p->status : '?',
5409 p->one->rename_used, p->broken_pair);
5410 }
5411
5412 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5413 {
5414 int i;
5415 if (msg)
5416 fprintf(stderr, "%s\n", msg);
5417 fprintf(stderr, "q->nr = %d\n", q->nr);
5418 for (i = 0; i < q->nr; i++) {
5419 struct diff_filepair *p = q->queue[i];
5420 diff_debug_filepair(p, i);
5421 }
5422 }
5423 #endif
5424
5425 static void diff_resolve_rename_copy(void)
5426 {
5427 int i;
5428 struct diff_filepair *p;
5429 struct diff_queue_struct *q = &diff_queued_diff;
5430
5431 diff_debug_queue("resolve-rename-copy", q);
5432
5433 for (i = 0; i < q->nr; i++) {
5434 p = q->queue[i];
5435 p->status = 0; /* undecided */
5436 if (DIFF_PAIR_UNMERGED(p))
5437 p->status = DIFF_STATUS_UNMERGED;
5438 else if (!DIFF_FILE_VALID(p->one))
5439 p->status = DIFF_STATUS_ADDED;
5440 else if (!DIFF_FILE_VALID(p->two))
5441 p->status = DIFF_STATUS_DELETED;
5442 else if (DIFF_PAIR_TYPE_CHANGED(p))
5443 p->status = DIFF_STATUS_TYPE_CHANGED;
5444
5445 /* from this point on, we are dealing with a pair
5446 * whose both sides are valid and of the same type, i.e.
5447 * either in-place edit or rename/copy edit.
5448 */
5449 else if (DIFF_PAIR_RENAME(p)) {
5450 /*
5451 * A rename might have re-connected a broken
5452 * pair up, causing the pathnames to be the
5453 * same again. If so, that's not a rename at
5454 * all, just a modification..
5455 *
5456 * Otherwise, see if this source was used for
5457 * multiple renames, in which case we decrement
5458 * the count, and call it a copy.
5459 */
5460 if (!strcmp(p->one->path, p->two->path))
5461 p->status = DIFF_STATUS_MODIFIED;
5462 else if (--p->one->rename_used > 0)
5463 p->status = DIFF_STATUS_COPIED;
5464 else
5465 p->status = DIFF_STATUS_RENAMED;
5466 }
5467 else if (oidcmp(&p->one->oid, &p->two->oid) ||
5468 p->one->mode != p->two->mode ||
5469 p->one->dirty_submodule ||
5470 p->two->dirty_submodule ||
5471 is_null_oid(&p->one->oid))
5472 p->status = DIFF_STATUS_MODIFIED;
5473 else {
5474 /* This is a "no-change" entry and should not
5475 * happen anymore, but prepare for broken callers.
5476 */
5477 error("feeding unmodified %s to diffcore",
5478 p->one->path);
5479 p->status = DIFF_STATUS_UNKNOWN;
5480 }
5481 }
5482 diff_debug_queue("resolve-rename-copy done", q);
5483 }
5484
5485 static int check_pair_status(struct diff_filepair *p)
5486 {
5487 switch (p->status) {
5488 case DIFF_STATUS_UNKNOWN:
5489 return 0;
5490 case 0:
5491 die("internal error in diff-resolve-rename-copy");
5492 default:
5493 return 1;
5494 }
5495 }
5496
5497 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5498 {
5499 int fmt = opt->output_format;
5500
5501 if (fmt & DIFF_FORMAT_CHECKDIFF)
5502 diff_flush_checkdiff(p, opt);
5503 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5504 diff_flush_raw(p, opt);
5505 else if (fmt & DIFF_FORMAT_NAME) {
5506 const char *name_a, *name_b;
5507 name_a = p->two->path;
5508 name_b = NULL;
5509 strip_prefix(opt->prefix_length, &name_a, &name_b);
5510 fprintf(opt->file, "%s", diff_line_prefix(opt));
5511 write_name_quoted(name_a, opt->file, opt->line_termination);
5512 }
5513 }
5514
5515 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5516 {
5517 struct strbuf sb = STRBUF_INIT;
5518 if (fs->mode)
5519 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5520 else
5521 strbuf_addf(&sb, " %s ", newdelete);
5522
5523 quote_c_style(fs->path, &sb, NULL, 0);
5524 strbuf_addch(&sb, '\n');
5525 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5526 sb.buf, sb.len, 0);
5527 strbuf_release(&sb);
5528 }
5529
5530 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5531 int show_name)
5532 {
5533 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5534 struct strbuf sb = STRBUF_INIT;
5535 strbuf_addf(&sb, " mode change %06o => %06o",
5536 p->one->mode, p->two->mode);
5537 if (show_name) {
5538 strbuf_addch(&sb, ' ');
5539 quote_c_style(p->two->path, &sb, NULL, 0);
5540 }
5541 strbuf_addch(&sb, '\n');
5542 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5543 sb.buf, sb.len, 0);
5544 strbuf_release(&sb);
5545 }
5546 }
5547
5548 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5549 struct diff_filepair *p)
5550 {
5551 struct strbuf sb = STRBUF_INIT;
5552 struct strbuf names = STRBUF_INIT;
5553
5554 pprint_rename(&names, p->one->path, p->two->path);
5555 strbuf_addf(&sb, " %s %s (%d%%)\n",
5556 renamecopy, names.buf, similarity_index(p));
5557 strbuf_release(&names);
5558 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5559 sb.buf, sb.len, 0);
5560 show_mode_change(opt, p, 0);
5561 strbuf_release(&sb);
5562 }
5563
5564 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5565 {
5566 switch(p->status) {
5567 case DIFF_STATUS_DELETED:
5568 show_file_mode_name(opt, "delete", p->one);
5569 break;
5570 case DIFF_STATUS_ADDED:
5571 show_file_mode_name(opt, "create", p->two);
5572 break;
5573 case DIFF_STATUS_COPIED:
5574 show_rename_copy(opt, "copy", p);
5575 break;
5576 case DIFF_STATUS_RENAMED:
5577 show_rename_copy(opt, "rename", p);
5578 break;
5579 default:
5580 if (p->score) {
5581 struct strbuf sb = STRBUF_INIT;
5582 strbuf_addstr(&sb, " rewrite ");
5583 quote_c_style(p->two->path, &sb, NULL, 0);
5584 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5585 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5586 sb.buf, sb.len, 0);
5587 strbuf_release(&sb);
5588 }
5589 show_mode_change(opt, p, !p->score);
5590 break;
5591 }
5592 }
5593
5594 struct patch_id_t {
5595 git_SHA_CTX *ctx;
5596 int patchlen;
5597 };
5598
5599 static int remove_space(char *line, int len)
5600 {
5601 int i;
5602 char *dst = line;
5603 unsigned char c;
5604
5605 for (i = 0; i < len; i++)
5606 if (!isspace((c = line[i])))
5607 *dst++ = c;
5608
5609 return dst - line;
5610 }
5611
5612 static void patch_id_consume(void *priv, char *line, unsigned long len)
5613 {
5614 struct patch_id_t *data = priv;
5615 int new_len;
5616
5617 /* Ignore line numbers when computing the SHA1 of the patch */
5618 if (starts_with(line, "@@ -"))
5619 return;
5620
5621 new_len = remove_space(line, len);
5622
5623 git_SHA1_Update(data->ctx, line, new_len);
5624 data->patchlen += new_len;
5625 }
5626
5627 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5628 {
5629 git_SHA1_Update(ctx, str, strlen(str));
5630 }
5631
5632 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5633 {
5634 /* large enough for 2^32 in octal */
5635 char buf[12];
5636 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5637 git_SHA1_Update(ctx, buf, len);
5638 }
5639
5640 /* returns 0 upon success, and writes result into sha1 */
5641 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5642 {
5643 struct diff_queue_struct *q = &diff_queued_diff;
5644 int i;
5645 git_SHA_CTX ctx;
5646 struct patch_id_t data;
5647
5648 git_SHA1_Init(&ctx);
5649 memset(&data, 0, sizeof(struct patch_id_t));
5650 data.ctx = &ctx;
5651
5652 for (i = 0; i < q->nr; i++) {
5653 xpparam_t xpp;
5654 xdemitconf_t xecfg;
5655 mmfile_t mf1, mf2;
5656 struct diff_filepair *p = q->queue[i];
5657 int len1, len2;
5658
5659 memset(&xpp, 0, sizeof(xpp));
5660 memset(&xecfg, 0, sizeof(xecfg));
5661 if (p->status == 0)
5662 return error("internal diff status error");
5663 if (p->status == DIFF_STATUS_UNKNOWN)
5664 continue;
5665 if (diff_unmodified_pair(p))
5666 continue;
5667 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5668 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5669 continue;
5670 if (DIFF_PAIR_UNMERGED(p))
5671 continue;
5672
5673 diff_fill_oid_info(p->one);
5674 diff_fill_oid_info(p->two);
5675
5676 len1 = remove_space(p->one->path, strlen(p->one->path));
5677 len2 = remove_space(p->two->path, strlen(p->two->path));
5678 patch_id_add_string(&ctx, "diff--git");
5679 patch_id_add_string(&ctx, "a/");
5680 git_SHA1_Update(&ctx, p->one->path, len1);
5681 patch_id_add_string(&ctx, "b/");
5682 git_SHA1_Update(&ctx, p->two->path, len2);
5683
5684 if (p->one->mode == 0) {
5685 patch_id_add_string(&ctx, "newfilemode");
5686 patch_id_add_mode(&ctx, p->two->mode);
5687 patch_id_add_string(&ctx, "---/dev/null");
5688 patch_id_add_string(&ctx, "+++b/");
5689 git_SHA1_Update(&ctx, p->two->path, len2);
5690 } else if (p->two->mode == 0) {
5691 patch_id_add_string(&ctx, "deletedfilemode");
5692 patch_id_add_mode(&ctx, p->one->mode);
5693 patch_id_add_string(&ctx, "---a/");
5694 git_SHA1_Update(&ctx, p->one->path, len1);
5695 patch_id_add_string(&ctx, "+++/dev/null");
5696 } else {
5697 patch_id_add_string(&ctx, "---a/");
5698 git_SHA1_Update(&ctx, p->one->path, len1);
5699 patch_id_add_string(&ctx, "+++b/");
5700 git_SHA1_Update(&ctx, p->two->path, len2);
5701 }
5702
5703 if (diff_header_only)
5704 continue;
5705
5706 if (fill_mmfile(&mf1, p->one) < 0 ||
5707 fill_mmfile(&mf2, p->two) < 0)
5708 return error("unable to read files to diff");
5709
5710 if (diff_filespec_is_binary(p->one) ||
5711 diff_filespec_is_binary(p->two)) {
5712 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5713 GIT_SHA1_HEXSZ);
5714 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5715 GIT_SHA1_HEXSZ);
5716 continue;
5717 }
5718
5719 xpp.flags = 0;
5720 xecfg.ctxlen = 3;
5721 xecfg.flags = 0;
5722 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5723 &xpp, &xecfg))
5724 return error("unable to generate patch-id diff for %s",
5725 p->one->path);
5726 }
5727
5728 git_SHA1_Final(oid->hash, &ctx);
5729 return 0;
5730 }
5731
5732 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5733 {
5734 struct diff_queue_struct *q = &diff_queued_diff;
5735 int i;
5736 int result = diff_get_patch_id(options, oid, diff_header_only);
5737
5738 for (i = 0; i < q->nr; i++)
5739 diff_free_filepair(q->queue[i]);
5740
5741 free(q->queue);
5742 DIFF_QUEUE_CLEAR(q);
5743
5744 return result;
5745 }
5746
5747 static int is_summary_empty(const struct diff_queue_struct *q)
5748 {
5749 int i;
5750
5751 for (i = 0; i < q->nr; i++) {
5752 const struct diff_filepair *p = q->queue[i];
5753
5754 switch (p->status) {
5755 case DIFF_STATUS_DELETED:
5756 case DIFF_STATUS_ADDED:
5757 case DIFF_STATUS_COPIED:
5758 case DIFF_STATUS_RENAMED:
5759 return 0;
5760 default:
5761 if (p->score)
5762 return 0;
5763 if (p->one->mode && p->two->mode &&
5764 p->one->mode != p->two->mode)
5765 return 0;
5766 break;
5767 }
5768 }
5769 return 1;
5770 }
5771
5772 static const char rename_limit_warning[] =
5773 N_("inexact rename detection was skipped due to too many files.");
5774
5775 static const char degrade_cc_to_c_warning[] =
5776 N_("only found copies from modified paths due to too many files.");
5777
5778 static const char rename_limit_advice[] =
5779 N_("you may want to set your %s variable to at least "
5780 "%d and retry the command.");
5781
5782 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5783 {
5784 fflush(stdout);
5785 if (degraded_cc)
5786 warning(_(degrade_cc_to_c_warning));
5787 else if (needed)
5788 warning(_(rename_limit_warning));
5789 else
5790 return;
5791 if (0 < needed)
5792 warning(_(rename_limit_advice), varname, needed);
5793 }
5794
5795 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5796 {
5797 int i;
5798 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5799 struct diff_queue_struct *q = &diff_queued_diff;
5800
5801 if (WSEH_NEW & WS_RULE_MASK)
5802 BUG("WS rules bit mask overlaps with diff symbol flags");
5803
5804 if (o->color_moved)
5805 o->emitted_symbols = &esm;
5806
5807 for (i = 0; i < q->nr; i++) {
5808 struct diff_filepair *p = q->queue[i];
5809 if (check_pair_status(p))
5810 diff_flush_patch(p, o);
5811 }
5812
5813 if (o->emitted_symbols) {
5814 if (o->color_moved) {
5815 struct hashmap add_lines, del_lines;
5816
5817 if (o->color_moved_ws_handling &
5818 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5819 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5820
5821 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5822 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5823
5824 add_lines_to_move_detection(o, &add_lines, &del_lines);
5825 mark_color_as_moved(o, &add_lines, &del_lines);
5826 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5827 dim_moved_lines(o);
5828
5829 hashmap_free(&add_lines, 0);
5830 hashmap_free(&del_lines, 0);
5831 }
5832
5833 for (i = 0; i < esm.nr; i++)
5834 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5835
5836 for (i = 0; i < esm.nr; i++)
5837 free((void *)esm.buf[i].line);
5838 }
5839 esm.nr = 0;
5840 }
5841
5842 void diff_flush(struct diff_options *options)
5843 {
5844 struct diff_queue_struct *q = &diff_queued_diff;
5845 int i, output_format = options->output_format;
5846 int separator = 0;
5847 int dirstat_by_line = 0;
5848
5849 /*
5850 * Order: raw, stat, summary, patch
5851 * or: name/name-status/checkdiff (other bits clear)
5852 */
5853 if (!q->nr)
5854 goto free_queue;
5855
5856 if (output_format & (DIFF_FORMAT_RAW |
5857 DIFF_FORMAT_NAME |
5858 DIFF_FORMAT_NAME_STATUS |
5859 DIFF_FORMAT_CHECKDIFF)) {
5860 for (i = 0; i < q->nr; i++) {
5861 struct diff_filepair *p = q->queue[i];
5862 if (check_pair_status(p))
5863 flush_one_pair(p, options);
5864 }
5865 separator++;
5866 }
5867
5868 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5869 dirstat_by_line = 1;
5870
5871 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5872 dirstat_by_line) {
5873 struct diffstat_t diffstat;
5874
5875 memset(&diffstat, 0, sizeof(struct diffstat_t));
5876 for (i = 0; i < q->nr; i++) {
5877 struct diff_filepair *p = q->queue[i];
5878 if (check_pair_status(p))
5879 diff_flush_stat(p, options, &diffstat);
5880 }
5881 if (output_format & DIFF_FORMAT_NUMSTAT)
5882 show_numstat(&diffstat, options);
5883 if (output_format & DIFF_FORMAT_DIFFSTAT)
5884 show_stats(&diffstat, options);
5885 if (output_format & DIFF_FORMAT_SHORTSTAT)
5886 show_shortstats(&diffstat, options);
5887 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5888 show_dirstat_by_line(&diffstat, options);
5889 free_diffstat_info(&diffstat);
5890 separator++;
5891 }
5892 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5893 show_dirstat(options);
5894
5895 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5896 for (i = 0; i < q->nr; i++) {
5897 diff_summary(options, q->queue[i]);
5898 }
5899 separator++;
5900 }
5901
5902 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5903 options->flags.exit_with_status &&
5904 options->flags.diff_from_contents) {
5905 /*
5906 * run diff_flush_patch for the exit status. setting
5907 * options->file to /dev/null should be safe, because we
5908 * aren't supposed to produce any output anyway.
5909 */
5910 if (options->close_file)
5911 fclose(options->file);
5912 options->file = xfopen("/dev/null", "w");
5913 options->close_file = 1;
5914 options->color_moved = 0;
5915 for (i = 0; i < q->nr; i++) {
5916 struct diff_filepair *p = q->queue[i];
5917 if (check_pair_status(p))
5918 diff_flush_patch(p, options);
5919 if (options->found_changes)
5920 break;
5921 }
5922 }
5923
5924 if (output_format & DIFF_FORMAT_PATCH) {
5925 if (separator) {
5926 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5927 if (options->stat_sep)
5928 /* attach patch instead of inline */
5929 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5930 NULL, 0, 0);
5931 }
5932
5933 diff_flush_patch_all_file_pairs(options);
5934 }
5935
5936 if (output_format & DIFF_FORMAT_CALLBACK)
5937 options->format_callback(q, options, options->format_callback_data);
5938
5939 for (i = 0; i < q->nr; i++)
5940 diff_free_filepair(q->queue[i]);
5941 free_queue:
5942 free(q->queue);
5943 DIFF_QUEUE_CLEAR(q);
5944 if (options->close_file)
5945 fclose(options->file);
5946
5947 /*
5948 * Report the content-level differences with HAS_CHANGES;
5949 * diff_addremove/diff_change does not set the bit when
5950 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5951 */
5952 if (options->flags.diff_from_contents) {
5953 if (options->found_changes)
5954 options->flags.has_changes = 1;
5955 else
5956 options->flags.has_changes = 0;
5957 }
5958 }
5959
5960 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5961 {
5962 return (((p->status == DIFF_STATUS_MODIFIED) &&
5963 ((p->score &&
5964 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5965 (!p->score &&
5966 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5967 ((p->status != DIFF_STATUS_MODIFIED) &&
5968 filter_bit_tst(p->status, options)));
5969 }
5970
5971 static void diffcore_apply_filter(struct diff_options *options)
5972 {
5973 int i;
5974 struct diff_queue_struct *q = &diff_queued_diff;
5975 struct diff_queue_struct outq;
5976
5977 DIFF_QUEUE_CLEAR(&outq);
5978
5979 if (!options->filter)
5980 return;
5981
5982 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5983 int found;
5984 for (i = found = 0; !found && i < q->nr; i++) {
5985 if (match_filter(options, q->queue[i]))
5986 found++;
5987 }
5988 if (found)
5989 return;
5990
5991 /* otherwise we will clear the whole queue
5992 * by copying the empty outq at the end of this
5993 * function, but first clear the current entries
5994 * in the queue.
5995 */
5996 for (i = 0; i < q->nr; i++)
5997 diff_free_filepair(q->queue[i]);
5998 }
5999 else {
6000 /* Only the matching ones */
6001 for (i = 0; i < q->nr; i++) {
6002 struct diff_filepair *p = q->queue[i];
6003 if (match_filter(options, p))
6004 diff_q(&outq, p);
6005 else
6006 diff_free_filepair(p);
6007 }
6008 }
6009 free(q->queue);
6010 *q = outq;
6011 }
6012
6013 /* Check whether two filespecs with the same mode and size are identical */
6014 static int diff_filespec_is_identical(struct diff_filespec *one,
6015 struct diff_filespec *two)
6016 {
6017 if (S_ISGITLINK(one->mode))
6018 return 0;
6019 if (diff_populate_filespec(one, 0))
6020 return 0;
6021 if (diff_populate_filespec(two, 0))
6022 return 0;
6023 return !memcmp(one->data, two->data, one->size);
6024 }
6025
6026 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
6027 {
6028 if (p->done_skip_stat_unmatch)
6029 return p->skip_stat_unmatch_result;
6030
6031 p->done_skip_stat_unmatch = 1;
6032 p->skip_stat_unmatch_result = 0;
6033 /*
6034 * 1. Entries that come from stat info dirtiness
6035 * always have both sides (iow, not create/delete),
6036 * one side of the object name is unknown, with
6037 * the same mode and size. Keep the ones that
6038 * do not match these criteria. They have real
6039 * differences.
6040 *
6041 * 2. At this point, the file is known to be modified,
6042 * with the same mode and size, and the object
6043 * name of one side is unknown. Need to inspect
6044 * the identical contents.
6045 */
6046 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6047 !DIFF_FILE_VALID(p->two) ||
6048 (p->one->oid_valid && p->two->oid_valid) ||
6049 (p->one->mode != p->two->mode) ||
6050 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
6051 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
6052 (p->one->size != p->two->size) ||
6053 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
6054 p->skip_stat_unmatch_result = 1;
6055 return p->skip_stat_unmatch_result;
6056 }
6057
6058 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6059 {
6060 int i;
6061 struct diff_queue_struct *q = &diff_queued_diff;
6062 struct diff_queue_struct outq;
6063 DIFF_QUEUE_CLEAR(&outq);
6064
6065 for (i = 0; i < q->nr; i++) {
6066 struct diff_filepair *p = q->queue[i];
6067
6068 if (diff_filespec_check_stat_unmatch(p))
6069 diff_q(&outq, p);
6070 else {
6071 /*
6072 * The caller can subtract 1 from skip_stat_unmatch
6073 * to determine how many paths were dirty only
6074 * due to stat info mismatch.
6075 */
6076 if (!diffopt->flags.no_index)
6077 diffopt->skip_stat_unmatch++;
6078 diff_free_filepair(p);
6079 }
6080 }
6081 free(q->queue);
6082 *q = outq;
6083 }
6084
6085 static int diffnamecmp(const void *a_, const void *b_)
6086 {
6087 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6088 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6089 const char *name_a, *name_b;
6090
6091 name_a = a->one ? a->one->path : a->two->path;
6092 name_b = b->one ? b->one->path : b->two->path;
6093 return strcmp(name_a, name_b);
6094 }
6095
6096 void diffcore_fix_diff_index(struct diff_options *options)
6097 {
6098 struct diff_queue_struct *q = &diff_queued_diff;
6099 QSORT(q->queue, q->nr, diffnamecmp);
6100 }
6101
6102 void diffcore_std(struct diff_options *options)
6103 {
6104 /* NOTE please keep the following in sync with diff_tree_combined() */
6105 if (options->skip_stat_unmatch)
6106 diffcore_skip_stat_unmatch(options);
6107 if (!options->found_follow) {
6108 /* See try_to_follow_renames() in tree-diff.c */
6109 if (options->break_opt != -1)
6110 diffcore_break(options->break_opt);
6111 if (options->detect_rename)
6112 diffcore_rename(options);
6113 if (options->break_opt != -1)
6114 diffcore_merge_broken();
6115 }
6116 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6117 diffcore_pickaxe(options);
6118 if (options->orderfile)
6119 diffcore_order(options->orderfile);
6120 if (!options->found_follow)
6121 /* See try_to_follow_renames() in tree-diff.c */
6122 diff_resolve_rename_copy();
6123 diffcore_apply_filter(options);
6124
6125 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6126 options->flags.has_changes = 1;
6127 else
6128 options->flags.has_changes = 0;
6129
6130 options->found_follow = 0;
6131 }
6132
6133 int diff_result_code(struct diff_options *opt, int status)
6134 {
6135 int result = 0;
6136
6137 diff_warn_rename_limit("diff.renameLimit",
6138 opt->needed_rename_limit,
6139 opt->degraded_cc_to_c);
6140 if (!opt->flags.exit_with_status &&
6141 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6142 return status;
6143 if (opt->flags.exit_with_status &&
6144 opt->flags.has_changes)
6145 result |= 01;
6146 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6147 opt->flags.check_failed)
6148 result |= 02;
6149 return result;
6150 }
6151
6152 int diff_can_quit_early(struct diff_options *opt)
6153 {
6154 return (opt->flags.quick &&
6155 !opt->filter &&
6156 opt->flags.has_changes);
6157 }
6158
6159 /*
6160 * Shall changes to this submodule be ignored?
6161 *
6162 * Submodule changes can be configured to be ignored separately for each path,
6163 * but that configuration can be overridden from the command line.
6164 */
6165 static int is_submodule_ignored(const char *path, struct diff_options *options)
6166 {
6167 int ignored = 0;
6168 struct diff_flags orig_flags = options->flags;
6169 if (!options->flags.override_submodule_config)
6170 set_diffopt_flags_from_submodule_config(options, path);
6171 if (options->flags.ignore_submodules)
6172 ignored = 1;
6173 options->flags = orig_flags;
6174 return ignored;
6175 }
6176
6177 void diff_addremove(struct diff_options *options,
6178 int addremove, unsigned mode,
6179 const struct object_id *oid,
6180 int oid_valid,
6181 const char *concatpath, unsigned dirty_submodule)
6182 {
6183 struct diff_filespec *one, *two;
6184
6185 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6186 return;
6187
6188 /* This may look odd, but it is a preparation for
6189 * feeding "there are unchanged files which should
6190 * not produce diffs, but when you are doing copy
6191 * detection you would need them, so here they are"
6192 * entries to the diff-core. They will be prefixed
6193 * with something like '=' or '*' (I haven't decided
6194 * which but should not make any difference).
6195 * Feeding the same new and old to diff_change()
6196 * also has the same effect.
6197 * Before the final output happens, they are pruned after
6198 * merged into rename/copy pairs as appropriate.
6199 */
6200 if (options->flags.reverse_diff)
6201 addremove = (addremove == '+' ? '-' :
6202 addremove == '-' ? '+' : addremove);
6203
6204 if (options->prefix &&
6205 strncmp(concatpath, options->prefix, options->prefix_length))
6206 return;
6207
6208 one = alloc_filespec(concatpath);
6209 two = alloc_filespec(concatpath);
6210
6211 if (addremove != '+')
6212 fill_filespec(one, oid, oid_valid, mode);
6213 if (addremove != '-') {
6214 fill_filespec(two, oid, oid_valid, mode);
6215 two->dirty_submodule = dirty_submodule;
6216 }
6217
6218 diff_queue(&diff_queued_diff, one, two);
6219 if (!options->flags.diff_from_contents)
6220 options->flags.has_changes = 1;
6221 }
6222
6223 void diff_change(struct diff_options *options,
6224 unsigned old_mode, unsigned new_mode,
6225 const struct object_id *old_oid,
6226 const struct object_id *new_oid,
6227 int old_oid_valid, int new_oid_valid,
6228 const char *concatpath,
6229 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6230 {
6231 struct diff_filespec *one, *two;
6232 struct diff_filepair *p;
6233
6234 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6235 is_submodule_ignored(concatpath, options))
6236 return;
6237
6238 if (options->flags.reverse_diff) {
6239 SWAP(old_mode, new_mode);
6240 SWAP(old_oid, new_oid);
6241 SWAP(old_oid_valid, new_oid_valid);
6242 SWAP(old_dirty_submodule, new_dirty_submodule);
6243 }
6244
6245 if (options->prefix &&
6246 strncmp(concatpath, options->prefix, options->prefix_length))
6247 return;
6248
6249 one = alloc_filespec(concatpath);
6250 two = alloc_filespec(concatpath);
6251 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6252 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6253 one->dirty_submodule = old_dirty_submodule;
6254 two->dirty_submodule = new_dirty_submodule;
6255 p = diff_queue(&diff_queued_diff, one, two);
6256
6257 if (options->flags.diff_from_contents)
6258 return;
6259
6260 if (options->flags.quick && options->skip_stat_unmatch &&
6261 !diff_filespec_check_stat_unmatch(p))
6262 return;
6263
6264 options->flags.has_changes = 1;
6265 }
6266
6267 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6268 {
6269 struct diff_filepair *pair;
6270 struct diff_filespec *one, *two;
6271
6272 if (options->prefix &&
6273 strncmp(path, options->prefix, options->prefix_length))
6274 return NULL;
6275
6276 one = alloc_filespec(path);
6277 two = alloc_filespec(path);
6278 pair = diff_queue(&diff_queued_diff, one, two);
6279 pair->is_unmerged = 1;
6280 return pair;
6281 }
6282
6283 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
6284 size_t *outsize)
6285 {
6286 struct diff_tempfile *temp;
6287 const char *argv[3];
6288 const char **arg = argv;
6289 struct child_process child = CHILD_PROCESS_INIT;
6290 struct strbuf buf = STRBUF_INIT;
6291 int err = 0;
6292
6293 temp = prepare_temp_file(spec->path, spec);
6294 *arg++ = pgm;
6295 *arg++ = temp->name;
6296 *arg = NULL;
6297
6298 child.use_shell = 1;
6299 child.argv = argv;
6300 child.out = -1;
6301 if (start_command(&child)) {
6302 remove_tempfile();
6303 return NULL;
6304 }
6305
6306 if (strbuf_read(&buf, child.out, 0) < 0)
6307 err = error("error reading from textconv command '%s'", pgm);
6308 close(child.out);
6309
6310 if (finish_command(&child) || err) {
6311 strbuf_release(&buf);
6312 remove_tempfile();
6313 return NULL;
6314 }
6315 remove_tempfile();
6316
6317 return strbuf_detach(&buf, outsize);
6318 }
6319
6320 size_t fill_textconv(struct userdiff_driver *driver,
6321 struct diff_filespec *df,
6322 char **outbuf)
6323 {
6324 size_t size;
6325
6326 if (!driver) {
6327 if (!DIFF_FILE_VALID(df)) {
6328 *outbuf = "";
6329 return 0;
6330 }
6331 if (diff_populate_filespec(df, 0))
6332 die("unable to read files to diff");
6333 *outbuf = df->data;
6334 return df->size;
6335 }
6336
6337 if (!driver->textconv)
6338 BUG("fill_textconv called with non-textconv driver");
6339
6340 if (driver->textconv_cache && df->oid_valid) {
6341 *outbuf = notes_cache_get(driver->textconv_cache,
6342 &df->oid,
6343 &size);
6344 if (*outbuf)
6345 return size;
6346 }
6347
6348 *outbuf = run_textconv(driver->textconv, df, &size);
6349 if (!*outbuf)
6350 die("unable to read files to diff");
6351
6352 if (driver->textconv_cache && df->oid_valid) {
6353 /* ignore errors, as we might be in a readonly repository */
6354 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6355 size);
6356 /*
6357 * we could save up changes and flush them all at the end,
6358 * but we would need an extra call after all diffing is done.
6359 * Since generating a cache entry is the slow path anyway,
6360 * this extra overhead probably isn't a big deal.
6361 */
6362 notes_cache_write(driver->textconv_cache);
6363 }
6364
6365 return size;
6366 }
6367
6368 int textconv_object(const char *path,
6369 unsigned mode,
6370 const struct object_id *oid,
6371 int oid_valid,
6372 char **buf,
6373 unsigned long *buf_size)
6374 {
6375 struct diff_filespec *df;
6376 struct userdiff_driver *textconv;
6377
6378 df = alloc_filespec(path);
6379 fill_filespec(df, oid, oid_valid, mode);
6380 textconv = get_textconv(df);
6381 if (!textconv) {
6382 free_filespec(df);
6383 return 0;
6384 }
6385
6386 *buf_size = fill_textconv(textconv, df, buf);
6387 free_filespec(df);
6388 return 1;
6389 }
6390
6391 void setup_diff_pager(struct diff_options *opt)
6392 {
6393 /*
6394 * If the user asked for our exit code, then either they want --quiet
6395 * or --exit-code. We should definitely not bother with a pager in the
6396 * former case, as we will generate no output. Since we still properly
6397 * report our exit code even when a pager is run, we _could_ run a
6398 * pager with --exit-code. But since we have not done so historically,
6399 * and because it is easy to find people oneline advising "git diff
6400 * --exit-code" in hooks and other scripts, we do not do so.
6401 */
6402 if (!opt->flags.exit_with_status &&
6403 check_pager_config("diff") != 0)
6404 setup_pager();
6405 }
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