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diff.c: add set_sign to emit_line_0
[git.git] / diff.c
blob4ef663892823e09fcde834c1b1ca0f82ac19dbbc
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_sign, 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 if (set_sign)
656 fputs(set_sign, file);
657 if (first && !nofirst)
658 fputc(first, file);
659 if (set && set != set_sign) {
660 if (set_sign)
661 fputs(reset, file);
662 fputs(set, file);
663 }
664 fwrite(line, len, 1, file);
665 fputs(reset, file);
666 }
667 if (has_trailing_carriage_return)
668 fputc('\r', file);
669 if (has_trailing_newline)
670 fputc('\n', file);
671 }
672
673 static void emit_line(struct diff_options *o, const char *set, const char *reset,
674 const char *line, int len)
675 {
676 emit_line_0(o, set, NULL, 0, reset, line[0], line+1, len-1);
677 }
678
679 enum diff_symbol {
680 DIFF_SYMBOL_BINARY_DIFF_HEADER,
681 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
682 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
683 DIFF_SYMBOL_BINARY_DIFF_BODY,
684 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
685 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
686 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
687 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
688 DIFF_SYMBOL_STATS_LINE,
689 DIFF_SYMBOL_WORD_DIFF,
690 DIFF_SYMBOL_STAT_SEP,
691 DIFF_SYMBOL_SUMMARY,
692 DIFF_SYMBOL_SUBMODULE_ADD,
693 DIFF_SYMBOL_SUBMODULE_DEL,
694 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
695 DIFF_SYMBOL_SUBMODULE_MODIFIED,
696 DIFF_SYMBOL_SUBMODULE_HEADER,
697 DIFF_SYMBOL_SUBMODULE_ERROR,
698 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
699 DIFF_SYMBOL_REWRITE_DIFF,
700 DIFF_SYMBOL_BINARY_FILES,
701 DIFF_SYMBOL_HEADER,
702 DIFF_SYMBOL_FILEPAIR_PLUS,
703 DIFF_SYMBOL_FILEPAIR_MINUS,
704 DIFF_SYMBOL_WORDS_PORCELAIN,
705 DIFF_SYMBOL_WORDS,
706 DIFF_SYMBOL_CONTEXT,
707 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
708 DIFF_SYMBOL_PLUS,
709 DIFF_SYMBOL_MINUS,
710 DIFF_SYMBOL_NO_LF_EOF,
711 DIFF_SYMBOL_CONTEXT_FRAGINFO,
712 DIFF_SYMBOL_CONTEXT_MARKER,
713 DIFF_SYMBOL_SEPARATOR
714 };
715 /*
716 * Flags for content lines:
717 * 0..12 are whitespace rules
718 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
719 * 16 is marking if the line is blank at EOF
720 */
721 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
722 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
723 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
724 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
725 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
726
727 /*
728 * This struct is used when we need to buffer the output of the diff output.
729 *
730 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
731 * into the pre/post image file. This pointer could be a union with the
732 * line pointer. By storing an offset into the file instead of the literal line,
733 * we can decrease the memory footprint for the buffered output. At first we
734 * may want to only have indirection for the content lines, but we could also
735 * enhance the state for emitting prefabricated lines, e.g. the similarity
736 * score line or hunk/file headers would only need to store a number or path
737 * and then the output can be constructed later on depending on state.
738 */
739 struct emitted_diff_symbol {
740 const char *line;
741 int len;
742 int flags;
743 enum diff_symbol s;
744 };
745 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
746
747 struct emitted_diff_symbols {
748 struct emitted_diff_symbol *buf;
749 int nr, alloc;
750 };
751 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
752
753 static void append_emitted_diff_symbol(struct diff_options *o,
754 struct emitted_diff_symbol *e)
755 {
756 struct emitted_diff_symbol *f;
757
758 ALLOC_GROW(o->emitted_symbols->buf,
759 o->emitted_symbols->nr + 1,
760 o->emitted_symbols->alloc);
761 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
762
763 memcpy(f, e, sizeof(struct emitted_diff_symbol));
764 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
765 }
766
767 struct moved_entry {
768 struct hashmap_entry ent;
769 const struct emitted_diff_symbol *es;
770 struct moved_entry *next_line;
771 struct ws_delta *wsd;
772 };
773
774 /**
775 * The struct ws_delta holds white space differences between moved lines, i.e.
776 * between '+' and '-' lines that have been detected to be a move.
777 * The string contains the difference in leading white spaces, before the
778 * rest of the line is compared using the white space config for move
779 * coloring. The current_longer indicates if the first string in the
780 * comparision is longer than the second.
781 */
782 struct ws_delta {
783 char *string;
784 unsigned int current_longer : 1;
785 };
786 #define WS_DELTA_INIT { NULL, 0 }
787
788 static int compute_ws_delta(const struct emitted_diff_symbol *a,
789 const struct emitted_diff_symbol *b,
790 struct ws_delta *out)
791 {
792 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
793 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
794 int d = longer->len - shorter->len;
795
796 out->string = xmemdupz(longer->line, d);
797 out->current_longer = (a == longer);
798
799 return !strncmp(longer->line + d, shorter->line, shorter->len);
800 }
801
802 static int cmp_in_block_with_wsd(const struct diff_options *o,
803 const struct moved_entry *cur,
804 const struct moved_entry *match,
805 struct moved_entry *pmb,
806 int n)
807 {
808 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
809 int al = cur->es->len, cl = l->len;
810 const char *a = cur->es->line,
811 *b = match->es->line,
812 *c = l->line;
813
814 int wslen;
815
816 /*
817 * We need to check if 'cur' is equal to 'match'.
818 * As those are from the same (+/-) side, we do not need to adjust for
819 * indent changes. However these were found using fuzzy matching
820 * so we do have to check if they are equal.
821 */
822 if (strcmp(a, b))
823 return 1;
824
825 if (!pmb->wsd)
826 /*
827 * No white space delta was carried forward? This can happen
828 * when we exit early in this function and do not carry
829 * forward ws.
830 */
831 return 1;
832
833 /*
834 * The indent changes of the block are known and carried forward in
835 * pmb->wsd; however we need to check if the indent changes of the
836 * current line are still the same as before.
837 *
838 * To do so we need to compare 'l' to 'cur', adjusting the
839 * one of them for the white spaces, depending which was longer.
840 */
841
842 wslen = strlen(pmb->wsd->string);
843 if (pmb->wsd->current_longer) {
844 c += wslen;
845 cl -= wslen;
846 } else {
847 a += wslen;
848 al -= wslen;
849 }
850
851 if (strcmp(a, c))
852 return 1;
853
854 return 0;
855 }
856
857 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
858 const void *entry,
859 const void *entry_or_key,
860 const void *keydata)
861 {
862 const struct diff_options *diffopt = hashmap_cmp_fn_data;
863 const struct moved_entry *a = entry;
864 const struct moved_entry *b = entry_or_key;
865 unsigned flags = diffopt->color_moved_ws_handling
866 & XDF_WHITESPACE_FLAGS;
867
868 if (diffopt->color_moved_ws_handling &
869 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
870 /*
871 * As there is not specific white space config given,
872 * we'd need to check for a new block, so ignore all
873 * white space. The setup of the white space
874 * configuration for the next block is done else where
875 */
876 flags |= XDF_IGNORE_WHITESPACE;
877
878 return !xdiff_compare_lines(a->es->line, a->es->len,
879 b->es->line, b->es->len,
880 flags);
881 }
882
883 static struct moved_entry *prepare_entry(struct diff_options *o,
884 int line_no)
885 {
886 struct moved_entry *ret = xmalloc(sizeof(*ret));
887 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
888 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
889
890 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
891 ret->es = l;
892 ret->next_line = NULL;
893 ret->wsd = NULL;
894
895 return ret;
896 }
897
898 static void add_lines_to_move_detection(struct diff_options *o,
899 struct hashmap *add_lines,
900 struct hashmap *del_lines)
901 {
902 struct moved_entry *prev_line = NULL;
903
904 int n;
905 for (n = 0; n < o->emitted_symbols->nr; n++) {
906 struct hashmap *hm;
907 struct moved_entry *key;
908
909 switch (o->emitted_symbols->buf[n].s) {
910 case DIFF_SYMBOL_PLUS:
911 hm = add_lines;
912 break;
913 case DIFF_SYMBOL_MINUS:
914 hm = del_lines;
915 break;
916 default:
917 prev_line = NULL;
918 continue;
919 }
920
921 key = prepare_entry(o, n);
922 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
923 prev_line->next_line = key;
924
925 hashmap_add(hm, key);
926 prev_line = key;
927 }
928 }
929
930 static void pmb_advance_or_null(struct diff_options *o,
931 struct moved_entry *match,
932 struct hashmap *hm,
933 struct moved_entry **pmb,
934 int pmb_nr)
935 {
936 int i;
937 for (i = 0; i < pmb_nr; i++) {
938 struct moved_entry *prev = pmb[i];
939 struct moved_entry *cur = (prev && prev->next_line) ?
940 prev->next_line : NULL;
941 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
942 pmb[i] = cur;
943 } else {
944 pmb[i] = NULL;
945 }
946 }
947 }
948
949 static void pmb_advance_or_null_multi_match(struct diff_options *o,
950 struct moved_entry *match,
951 struct hashmap *hm,
952 struct moved_entry **pmb,
953 int pmb_nr, int n)
954 {
955 int i;
956 char *got_match = xcalloc(1, pmb_nr);
957
958 for (; match; match = hashmap_get_next(hm, match)) {
959 for (i = 0; i < pmb_nr; i++) {
960 struct moved_entry *prev = pmb[i];
961 struct moved_entry *cur = (prev && prev->next_line) ?
962 prev->next_line : NULL;
963 if (!cur)
964 continue;
965 if (!cmp_in_block_with_wsd(o, cur, match, pmb[i], n))
966 got_match[i] |= 1;
967 }
968 }
969
970 for (i = 0; i < pmb_nr; i++) {
971 if (got_match[i]) {
972 /* Carry the white space delta forward */
973 pmb[i]->next_line->wsd = pmb[i]->wsd;
974 pmb[i] = pmb[i]->next_line;
975 } else
976 pmb[i] = NULL;
977 }
978 }
979
980 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
981 int pmb_nr)
982 {
983 int lp, rp;
984
985 /* Shrink the set of potential block to the remaining running */
986 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
987 while (lp < pmb_nr && pmb[lp])
988 lp++;
989 /* lp points at the first NULL now */
990
991 while (rp > -1 && !pmb[rp])
992 rp--;
993 /* rp points at the last non-NULL */
994
995 if (lp < pmb_nr && rp > -1 && lp < rp) {
996 pmb[lp] = pmb[rp];
997 if (pmb[rp]->wsd) {
998 free(pmb[rp]->wsd->string);
999 FREE_AND_NULL(pmb[rp]->wsd);
1000 }
1001 pmb[rp] = NULL;
1002 rp--;
1003 lp++;
1004 }
1005 }
1006
1007 /* Remember the number of running sets */
1008 return rp + 1;
1009 }
1010
1011 /*
1012 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1013 *
1014 * Otherwise, if the last block has fewer alphanumeric characters than
1015 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1016 * that block.
1017 *
1018 * The last block consists of the (n - block_length)'th line up to but not
1019 * including the nth line.
1020 *
1021 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1022 * Think of a way to unify them.
1023 */
1024 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1025 {
1026 int i, alnum_count = 0;
1027 if (o->color_moved == COLOR_MOVED_PLAIN)
1028 return;
1029 for (i = 1; i < block_length + 1; i++) {
1030 const char *c = o->emitted_symbols->buf[n - i].line;
1031 for (; *c; c++) {
1032 if (!isalnum(*c))
1033 continue;
1034 alnum_count++;
1035 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1036 return;
1037 }
1038 }
1039 for (i = 1; i < block_length + 1; i++)
1040 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1041 }
1042
1043 /* Find blocks of moved code, delegate actual coloring decision to helper */
1044 static void mark_color_as_moved(struct diff_options *o,
1045 struct hashmap *add_lines,
1046 struct hashmap *del_lines)
1047 {
1048 struct moved_entry **pmb = NULL; /* potentially moved blocks */
1049 int pmb_nr = 0, pmb_alloc = 0;
1050 int n, flipped_block = 1, block_length = 0;
1051
1052
1053 for (n = 0; n < o->emitted_symbols->nr; n++) {
1054 struct hashmap *hm = NULL;
1055 struct moved_entry *key;
1056 struct moved_entry *match = NULL;
1057 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1058
1059 switch (l->s) {
1060 case DIFF_SYMBOL_PLUS:
1061 hm = del_lines;
1062 key = prepare_entry(o, n);
1063 match = hashmap_get(hm, key, NULL);
1064 free(key);
1065 break;
1066 case DIFF_SYMBOL_MINUS:
1067 hm = add_lines;
1068 key = prepare_entry(o, n);
1069 match = hashmap_get(hm, key, NULL);
1070 free(key);
1071 break;
1072 default:
1073 flipped_block = 1;
1074 }
1075
1076 if (!match) {
1077 adjust_last_block(o, n, block_length);
1078 pmb_nr = 0;
1079 block_length = 0;
1080 continue;
1081 }
1082
1083 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1084
1085 if (o->color_moved == COLOR_MOVED_PLAIN)
1086 continue;
1087
1088 if (o->color_moved_ws_handling &
1089 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1090 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1091 else
1092 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1093
1094 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1095
1096 if (pmb_nr == 0) {
1097 /*
1098 * The current line is the start of a new block.
1099 * Setup the set of potential blocks.
1100 */
1101 for (; match; match = hashmap_get_next(hm, match)) {
1102 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1103 if (o->color_moved_ws_handling &
1104 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1105 struct ws_delta *wsd = xmalloc(sizeof(*match->wsd));
1106 if (compute_ws_delta(l, match->es, wsd)) {
1107 match->wsd = wsd;
1108 pmb[pmb_nr++] = match;
1109 } else
1110 free(wsd);
1111 } else {
1112 pmb[pmb_nr++] = match;
1113 }
1114 }
1115
1116 flipped_block = (flipped_block + 1) % 2;
1117
1118 adjust_last_block(o, n, block_length);
1119 block_length = 0;
1120 }
1121
1122 block_length++;
1123
1124 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1125 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1126 }
1127 adjust_last_block(o, n, block_length);
1128
1129 free(pmb);
1130 }
1131
1132 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1133 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1134 static void dim_moved_lines(struct diff_options *o)
1135 {
1136 int n;
1137 for (n = 0; n < o->emitted_symbols->nr; n++) {
1138 struct emitted_diff_symbol *prev = (n != 0) ?
1139 &o->emitted_symbols->buf[n - 1] : NULL;
1140 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1141 struct emitted_diff_symbol *next =
1142 (n < o->emitted_symbols->nr - 1) ?
1143 &o->emitted_symbols->buf[n + 1] : NULL;
1144
1145 /* Not a plus or minus line? */
1146 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1147 continue;
1148
1149 /* Not a moved line? */
1150 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1151 continue;
1152
1153 /*
1154 * If prev or next are not a plus or minus line,
1155 * pretend they don't exist
1156 */
1157 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1158 prev->s != DIFF_SYMBOL_MINUS)
1159 prev = NULL;
1160 if (next && next->s != DIFF_SYMBOL_PLUS &&
1161 next->s != DIFF_SYMBOL_MINUS)
1162 next = NULL;
1163
1164 /* Inside a block? */
1165 if ((prev &&
1166 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1167 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1168 (next &&
1169 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1170 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1171 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1172 continue;
1173 }
1174
1175 /* Check if we are at an interesting bound: */
1176 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1177 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1178 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1179 continue;
1180 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1181 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1182 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1183 continue;
1184
1185 /*
1186 * The boundary to prev and next are not interesting,
1187 * so this line is not interesting as a whole
1188 */
1189 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1190 }
1191 }
1192
1193 static void emit_line_ws_markup(struct diff_options *o,
1194 const char *set_sign, const char *set,
1195 const char *reset,
1196 char sign, const char *line, int len,
1197 unsigned ws_rule, int blank_at_eof)
1198 {
1199 const char *ws = NULL;
1200
1201 if (o->ws_error_highlight & ws_rule) {
1202 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1203 if (!*ws)
1204 ws = NULL;
1205 }
1206
1207 if (!ws && !set_sign)
1208 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1209 else if (!ws) {
1210 /* Emit just the prefix, then the rest. */
1211 emit_line_0(o, set_sign, NULL, !!set_sign, reset, sign, "", 0);
1212 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
1213 } else if (blank_at_eof)
1214 /* Blank line at EOF - paint '+' as well */
1215 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1216 else {
1217 /* Emit just the prefix, then the rest. */
1218 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1219 sign, "", 0);
1220 ws_check_emit(line, len, ws_rule,
1221 o->file, set, reset, ws);
1222 }
1223 }
1224
1225 static void emit_diff_symbol_from_struct(struct diff_options *o,
1226 struct emitted_diff_symbol *eds)
1227 {
1228 static const char *nneof = " No newline at end of file\n";
1229 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1230 struct strbuf sb = STRBUF_INIT;
1231
1232 enum diff_symbol s = eds->s;
1233 const char *line = eds->line;
1234 int len = eds->len;
1235 unsigned flags = eds->flags;
1236
1237 switch (s) {
1238 case DIFF_SYMBOL_NO_LF_EOF:
1239 context = diff_get_color_opt(o, DIFF_CONTEXT);
1240 reset = diff_get_color_opt(o, DIFF_RESET);
1241 putc('\n', o->file);
1242 emit_line_0(o, context, NULL, 0, reset, '\\',
1243 nneof, strlen(nneof));
1244 break;
1245 case DIFF_SYMBOL_SUBMODULE_HEADER:
1246 case DIFF_SYMBOL_SUBMODULE_ERROR:
1247 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1248 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1249 case DIFF_SYMBOL_SUMMARY:
1250 case DIFF_SYMBOL_STATS_LINE:
1251 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1252 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1253 emit_line(o, "", "", line, len);
1254 break;
1255 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1256 case DIFF_SYMBOL_CONTEXT_MARKER:
1257 context = diff_get_color_opt(o, DIFF_CONTEXT);
1258 reset = diff_get_color_opt(o, DIFF_RESET);
1259 emit_line(o, context, reset, line, len);
1260 break;
1261 case DIFF_SYMBOL_SEPARATOR:
1262 fprintf(o->file, "%s%c",
1263 diff_line_prefix(o),
1264 o->line_termination);
1265 break;
1266 case DIFF_SYMBOL_CONTEXT:
1267 set = diff_get_color_opt(o, DIFF_CONTEXT);
1268 reset = diff_get_color_opt(o, DIFF_RESET);
1269 set_sign = NULL;
1270 if (o->flags.dual_color_diffed_diffs) {
1271 char c = !len ? 0 : line[0];
1272
1273 if (c == '+')
1274 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1275 else if (c == '@')
1276 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1277 else if (c == '-')
1278 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1279 }
1280 emit_line_ws_markup(o, set_sign, set, reset, ' ', line, len,
1281 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1282 break;
1283 case DIFF_SYMBOL_PLUS:
1284 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1285 DIFF_SYMBOL_MOVED_LINE_ALT |
1286 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1287 case DIFF_SYMBOL_MOVED_LINE |
1288 DIFF_SYMBOL_MOVED_LINE_ALT |
1289 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1290 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1291 break;
1292 case DIFF_SYMBOL_MOVED_LINE |
1293 DIFF_SYMBOL_MOVED_LINE_ALT:
1294 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1295 break;
1296 case DIFF_SYMBOL_MOVED_LINE |
1297 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1298 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1299 break;
1300 case DIFF_SYMBOL_MOVED_LINE:
1301 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1302 break;
1303 default:
1304 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1305 }
1306 reset = diff_get_color_opt(o, DIFF_RESET);
1307 if (!o->flags.dual_color_diffed_diffs)
1308 set_sign = NULL;
1309 else {
1310 char c = !len ? 0 : line[0];
1311
1312 set_sign = set;
1313 if (c == '-')
1314 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1315 else if (c == '@')
1316 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1317 else if (c == '+')
1318 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1319 else
1320 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1321 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1322 }
1323 emit_line_ws_markup(o, set_sign, set, reset, '+', line, len,
1324 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1325 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1326 break;
1327 case DIFF_SYMBOL_MINUS:
1328 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1329 DIFF_SYMBOL_MOVED_LINE_ALT |
1330 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1331 case DIFF_SYMBOL_MOVED_LINE |
1332 DIFF_SYMBOL_MOVED_LINE_ALT |
1333 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1334 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1335 break;
1336 case DIFF_SYMBOL_MOVED_LINE |
1337 DIFF_SYMBOL_MOVED_LINE_ALT:
1338 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1339 break;
1340 case DIFF_SYMBOL_MOVED_LINE |
1341 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1342 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1343 break;
1344 case DIFF_SYMBOL_MOVED_LINE:
1345 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1346 break;
1347 default:
1348 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1349 }
1350 reset = diff_get_color_opt(o, DIFF_RESET);
1351 if (!o->flags.dual_color_diffed_diffs)
1352 set_sign = NULL;
1353 else {
1354 char c = !len ? 0 : line[0];
1355
1356 set_sign = set;
1357 if (c == '+')
1358 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1359 else if (c == '@')
1360 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1361 else if (c == '-')
1362 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1363 else
1364 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1365 }
1366 emit_line_ws_markup(o, set_sign, set, reset, '-', line, len,
1367 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1368 break;
1369 case DIFF_SYMBOL_WORDS_PORCELAIN:
1370 context = diff_get_color_opt(o, DIFF_CONTEXT);
1371 reset = diff_get_color_opt(o, DIFF_RESET);
1372 emit_line(o, context, reset, line, len);
1373 fputs("~\n", o->file);
1374 break;
1375 case DIFF_SYMBOL_WORDS:
1376 context = diff_get_color_opt(o, DIFF_CONTEXT);
1377 reset = diff_get_color_opt(o, DIFF_RESET);
1378 /*
1379 * Skip the prefix character, if any. With
1380 * diff_suppress_blank_empty, there may be
1381 * none.
1382 */
1383 if (line[0] != '\n') {
1384 line++;
1385 len--;
1386 }
1387 emit_line(o, context, reset, line, len);
1388 break;
1389 case DIFF_SYMBOL_FILEPAIR_PLUS:
1390 meta = diff_get_color_opt(o, DIFF_METAINFO);
1391 reset = diff_get_color_opt(o, DIFF_RESET);
1392 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1393 line, reset,
1394 strchr(line, ' ') ? "\t" : "");
1395 break;
1396 case DIFF_SYMBOL_FILEPAIR_MINUS:
1397 meta = diff_get_color_opt(o, DIFF_METAINFO);
1398 reset = diff_get_color_opt(o, DIFF_RESET);
1399 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1400 line, reset,
1401 strchr(line, ' ') ? "\t" : "");
1402 break;
1403 case DIFF_SYMBOL_BINARY_FILES:
1404 case DIFF_SYMBOL_HEADER:
1405 fprintf(o->file, "%s", line);
1406 break;
1407 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1408 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1409 break;
1410 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1411 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1412 break;
1413 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1414 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1415 break;
1416 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1417 fputs(diff_line_prefix(o), o->file);
1418 fputc('\n', o->file);
1419 break;
1420 case DIFF_SYMBOL_REWRITE_DIFF:
1421 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1422 reset = diff_get_color_opt(o, DIFF_RESET);
1423 emit_line(o, fraginfo, reset, line, len);
1424 break;
1425 case DIFF_SYMBOL_SUBMODULE_ADD:
1426 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1427 reset = diff_get_color_opt(o, DIFF_RESET);
1428 emit_line(o, set, reset, line, len);
1429 break;
1430 case DIFF_SYMBOL_SUBMODULE_DEL:
1431 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1432 reset = diff_get_color_opt(o, DIFF_RESET);
1433 emit_line(o, set, reset, line, len);
1434 break;
1435 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1436 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1437 diff_line_prefix(o), line);
1438 break;
1439 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1440 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1441 diff_line_prefix(o), line);
1442 break;
1443 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1444 emit_line(o, "", "", " 0 files changed\n",
1445 strlen(" 0 files changed\n"));
1446 break;
1447 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1448 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1449 break;
1450 case DIFF_SYMBOL_WORD_DIFF:
1451 fprintf(o->file, "%.*s", len, line);
1452 break;
1453 case DIFF_SYMBOL_STAT_SEP:
1454 fputs(o->stat_sep, o->file);
1455 break;
1456 default:
1457 BUG("unknown diff symbol");
1458 }
1459 strbuf_release(&sb);
1460 }
1461
1462 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1463 const char *line, int len, unsigned flags)
1464 {
1465 struct emitted_diff_symbol e = {line, len, flags, s};
1466
1467 if (o->emitted_symbols)
1468 append_emitted_diff_symbol(o, &e);
1469 else
1470 emit_diff_symbol_from_struct(o, &e);
1471 }
1472
1473 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1474 {
1475 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1476 }
1477
1478 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1479 {
1480 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1481 }
1482
1483 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1484 {
1485 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1486 path, strlen(path), 0);
1487 }
1488
1489 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1490 {
1491 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1492 path, strlen(path), 0);
1493 }
1494
1495 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1496 {
1497 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1498 header, strlen(header), 0);
1499 }
1500
1501 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1502 {
1503 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1504 }
1505
1506 void diff_emit_submodule_pipethrough(struct diff_options *o,
1507 const char *line, int len)
1508 {
1509 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1510 }
1511
1512 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1513 {
1514 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1515 ecbdata->blank_at_eof_in_preimage &&
1516 ecbdata->blank_at_eof_in_postimage &&
1517 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1518 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1519 return 0;
1520 return ws_blank_line(line, len, ecbdata->ws_rule);
1521 }
1522
1523 static void emit_add_line(const char *reset,
1524 struct emit_callback *ecbdata,
1525 const char *line, int len)
1526 {
1527 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1528 if (new_blank_line_at_eof(ecbdata, line, len))
1529 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1530
1531 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1532 }
1533
1534 static void emit_del_line(const char *reset,
1535 struct emit_callback *ecbdata,
1536 const char *line, int len)
1537 {
1538 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1539 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1540 }
1541
1542 static void emit_context_line(const char *reset,
1543 struct emit_callback *ecbdata,
1544 const char *line, int len)
1545 {
1546 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1547 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1548 }
1549
1550 static void emit_hunk_header(struct emit_callback *ecbdata,
1551 const char *line, int len)
1552 {
1553 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1554 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1555 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1556 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1557 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1558 static const char atat[2] = { '@', '@' };
1559 const char *cp, *ep;
1560 struct strbuf msgbuf = STRBUF_INIT;
1561 int org_len = len;
1562 int i = 1;
1563
1564 /*
1565 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1566 * it always is at least 10 bytes long.
1567 */
1568 if (len < 10 ||
1569 memcmp(line, atat, 2) ||
1570 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1571 emit_diff_symbol(ecbdata->opt,
1572 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1573 return;
1574 }
1575 ep += 2; /* skip over @@ */
1576
1577 /* The hunk header in fraginfo color */
1578 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1579 strbuf_addstr(&msgbuf, reverse);
1580 strbuf_addstr(&msgbuf, frag);
1581 strbuf_add(&msgbuf, line, ep - line);
1582 strbuf_addstr(&msgbuf, reset);
1583
1584 /*
1585 * trailing "\r\n"
1586 */
1587 for ( ; i < 3; i++)
1588 if (line[len - i] == '\r' || line[len - i] == '\n')
1589 len--;
1590
1591 /* blank before the func header */
1592 for (cp = ep; ep - line < len; ep++)
1593 if (*ep != ' ' && *ep != '\t')
1594 break;
1595 if (ep != cp) {
1596 strbuf_addstr(&msgbuf, context);
1597 strbuf_add(&msgbuf, cp, ep - cp);
1598 strbuf_addstr(&msgbuf, reset);
1599 }
1600
1601 if (ep < line + len) {
1602 strbuf_addstr(&msgbuf, func);
1603 strbuf_add(&msgbuf, ep, line + len - ep);
1604 strbuf_addstr(&msgbuf, reset);
1605 }
1606
1607 strbuf_add(&msgbuf, line + len, org_len - len);
1608 strbuf_complete_line(&msgbuf);
1609 emit_diff_symbol(ecbdata->opt,
1610 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1611 strbuf_release(&msgbuf);
1612 }
1613
1614 static struct diff_tempfile *claim_diff_tempfile(void) {
1615 int i;
1616 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1617 if (!diff_temp[i].name)
1618 return diff_temp + i;
1619 BUG("diff is failing to clean up its tempfiles");
1620 }
1621
1622 static void remove_tempfile(void)
1623 {
1624 int i;
1625 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1626 if (is_tempfile_active(diff_temp[i].tempfile))
1627 delete_tempfile(&diff_temp[i].tempfile);
1628 diff_temp[i].name = NULL;
1629 }
1630 }
1631
1632 static void add_line_count(struct strbuf *out, int count)
1633 {
1634 switch (count) {
1635 case 0:
1636 strbuf_addstr(out, "0,0");
1637 break;
1638 case 1:
1639 strbuf_addstr(out, "1");
1640 break;
1641 default:
1642 strbuf_addf(out, "1,%d", count);
1643 break;
1644 }
1645 }
1646
1647 static void emit_rewrite_lines(struct emit_callback *ecb,
1648 int prefix, const char *data, int size)
1649 {
1650 const char *endp = NULL;
1651 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1652
1653 while (0 < size) {
1654 int len;
1655
1656 endp = memchr(data, '\n', size);
1657 len = endp ? (endp - data + 1) : size;
1658 if (prefix != '+') {
1659 ecb->lno_in_preimage++;
1660 emit_del_line(reset, ecb, data, len);
1661 } else {
1662 ecb->lno_in_postimage++;
1663 emit_add_line(reset, ecb, data, len);
1664 }
1665 size -= len;
1666 data += len;
1667 }
1668 if (!endp)
1669 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1670 }
1671
1672 static void emit_rewrite_diff(const char *name_a,
1673 const char *name_b,
1674 struct diff_filespec *one,
1675 struct diff_filespec *two,
1676 struct userdiff_driver *textconv_one,
1677 struct userdiff_driver *textconv_two,
1678 struct diff_options *o)
1679 {
1680 int lc_a, lc_b;
1681 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1682 const char *a_prefix, *b_prefix;
1683 char *data_one, *data_two;
1684 size_t size_one, size_two;
1685 struct emit_callback ecbdata;
1686 struct strbuf out = STRBUF_INIT;
1687
1688 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1689 a_prefix = o->b_prefix;
1690 b_prefix = o->a_prefix;
1691 } else {
1692 a_prefix = o->a_prefix;
1693 b_prefix = o->b_prefix;
1694 }
1695
1696 name_a += (*name_a == '/');
1697 name_b += (*name_b == '/');
1698
1699 strbuf_reset(&a_name);
1700 strbuf_reset(&b_name);
1701 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1702 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1703
1704 size_one = fill_textconv(textconv_one, one, &data_one);
1705 size_two = fill_textconv(textconv_two, two, &data_two);
1706
1707 memset(&ecbdata, 0, sizeof(ecbdata));
1708 ecbdata.color_diff = want_color(o->use_color);
1709 ecbdata.ws_rule = whitespace_rule(name_b);
1710 ecbdata.opt = o;
1711 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1712 mmfile_t mf1, mf2;
1713 mf1.ptr = (char *)data_one;
1714 mf2.ptr = (char *)data_two;
1715 mf1.size = size_one;
1716 mf2.size = size_two;
1717 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1718 }
1719 ecbdata.lno_in_preimage = 1;
1720 ecbdata.lno_in_postimage = 1;
1721
1722 lc_a = count_lines(data_one, size_one);
1723 lc_b = count_lines(data_two, size_two);
1724
1725 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1726 a_name.buf, a_name.len, 0);
1727 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1728 b_name.buf, b_name.len, 0);
1729
1730 strbuf_addstr(&out, "@@ -");
1731 if (!o->irreversible_delete)
1732 add_line_count(&out, lc_a);
1733 else
1734 strbuf_addstr(&out, "?,?");
1735 strbuf_addstr(&out, " +");
1736 add_line_count(&out, lc_b);
1737 strbuf_addstr(&out, " @@\n");
1738 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1739 strbuf_release(&out);
1740
1741 if (lc_a && !o->irreversible_delete)
1742 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1743 if (lc_b)
1744 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1745 if (textconv_one)
1746 free((char *)data_one);
1747 if (textconv_two)
1748 free((char *)data_two);
1749 }
1750
1751 struct diff_words_buffer {
1752 mmfile_t text;
1753 unsigned long alloc;
1754 struct diff_words_orig {
1755 const char *begin, *end;
1756 } *orig;
1757 int orig_nr, orig_alloc;
1758 };
1759
1760 static void diff_words_append(char *line, unsigned long len,
1761 struct diff_words_buffer *buffer)
1762 {
1763 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1764 line++;
1765 len--;
1766 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1767 buffer->text.size += len;
1768 buffer->text.ptr[buffer->text.size] = '\0';
1769 }
1770
1771 struct diff_words_style_elem {
1772 const char *prefix;
1773 const char *suffix;
1774 const char *color; /* NULL; filled in by the setup code if
1775 * color is enabled */
1776 };
1777
1778 struct diff_words_style {
1779 enum diff_words_type type;
1780 struct diff_words_style_elem new_word, old_word, ctx;
1781 const char *newline;
1782 };
1783
1784 static struct diff_words_style diff_words_styles[] = {
1785 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1786 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1787 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1788 };
1789
1790 struct diff_words_data {
1791 struct diff_words_buffer minus, plus;
1792 const char *current_plus;
1793 int last_minus;
1794 struct diff_options *opt;
1795 regex_t *word_regex;
1796 enum diff_words_type type;
1797 struct diff_words_style *style;
1798 };
1799
1800 static int fn_out_diff_words_write_helper(struct diff_options *o,
1801 struct diff_words_style_elem *st_el,
1802 const char *newline,
1803 size_t count, const char *buf)
1804 {
1805 int print = 0;
1806 struct strbuf sb = STRBUF_INIT;
1807
1808 while (count) {
1809 char *p = memchr(buf, '\n', count);
1810 if (print)
1811 strbuf_addstr(&sb, diff_line_prefix(o));
1812
1813 if (p != buf) {
1814 const char *reset = st_el->color && *st_el->color ?
1815 GIT_COLOR_RESET : NULL;
1816 if (st_el->color && *st_el->color)
1817 strbuf_addstr(&sb, st_el->color);
1818 strbuf_addstr(&sb, st_el->prefix);
1819 strbuf_add(&sb, buf, p ? p - buf : count);
1820 strbuf_addstr(&sb, st_el->suffix);
1821 if (reset)
1822 strbuf_addstr(&sb, reset);
1823 }
1824 if (!p)
1825 goto out;
1826
1827 strbuf_addstr(&sb, newline);
1828 count -= p + 1 - buf;
1829 buf = p + 1;
1830 print = 1;
1831 if (count) {
1832 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1833 sb.buf, sb.len, 0);
1834 strbuf_reset(&sb);
1835 }
1836 }
1837
1838 out:
1839 if (sb.len)
1840 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1841 sb.buf, sb.len, 0);
1842 strbuf_release(&sb);
1843 return 0;
1844 }
1845
1846 /*
1847 * '--color-words' algorithm can be described as:
1848 *
1849 * 1. collect the minus/plus lines of a diff hunk, divided into
1850 * minus-lines and plus-lines;
1851 *
1852 * 2. break both minus-lines and plus-lines into words and
1853 * place them into two mmfile_t with one word for each line;
1854 *
1855 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1856 *
1857 * And for the common parts of the both file, we output the plus side text.
1858 * diff_words->current_plus is used to trace the current position of the plus file
1859 * which printed. diff_words->last_minus is used to trace the last minus word
1860 * printed.
1861 *
1862 * For '--graph' to work with '--color-words', we need to output the graph prefix
1863 * on each line of color words output. Generally, there are two conditions on
1864 * which we should output the prefix.
1865 *
1866 * 1. diff_words->last_minus == 0 &&
1867 * diff_words->current_plus == diff_words->plus.text.ptr
1868 *
1869 * that is: the plus text must start as a new line, and if there is no minus
1870 * word printed, a graph prefix must be printed.
1871 *
1872 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1873 * *(diff_words->current_plus - 1) == '\n'
1874 *
1875 * that is: a graph prefix must be printed following a '\n'
1876 */
1877 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1878 {
1879 if ((diff_words->last_minus == 0 &&
1880 diff_words->current_plus == diff_words->plus.text.ptr) ||
1881 (diff_words->current_plus > diff_words->plus.text.ptr &&
1882 *(diff_words->current_plus - 1) == '\n')) {
1883 return 1;
1884 } else {
1885 return 0;
1886 }
1887 }
1888
1889 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1890 {
1891 struct diff_words_data *diff_words = priv;
1892 struct diff_words_style *style = diff_words->style;
1893 int minus_first, minus_len, plus_first, plus_len;
1894 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1895 struct diff_options *opt = diff_words->opt;
1896 const char *line_prefix;
1897
1898 if (line[0] != '@' || parse_hunk_header(line, len,
1899 &minus_first, &minus_len, &plus_first, &plus_len))
1900 return;
1901
1902 assert(opt);
1903 line_prefix = diff_line_prefix(opt);
1904
1905 /* POSIX requires that first be decremented by one if len == 0... */
1906 if (minus_len) {
1907 minus_begin = diff_words->minus.orig[minus_first].begin;
1908 minus_end =
1909 diff_words->minus.orig[minus_first + minus_len - 1].end;
1910 } else
1911 minus_begin = minus_end =
1912 diff_words->minus.orig[minus_first].end;
1913
1914 if (plus_len) {
1915 plus_begin = diff_words->plus.orig[plus_first].begin;
1916 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1917 } else
1918 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1919
1920 if (color_words_output_graph_prefix(diff_words)) {
1921 fputs(line_prefix, diff_words->opt->file);
1922 }
1923 if (diff_words->current_plus != plus_begin) {
1924 fn_out_diff_words_write_helper(diff_words->opt,
1925 &style->ctx, style->newline,
1926 plus_begin - diff_words->current_plus,
1927 diff_words->current_plus);
1928 }
1929 if (minus_begin != minus_end) {
1930 fn_out_diff_words_write_helper(diff_words->opt,
1931 &style->old_word, style->newline,
1932 minus_end - minus_begin, minus_begin);
1933 }
1934 if (plus_begin != plus_end) {
1935 fn_out_diff_words_write_helper(diff_words->opt,
1936 &style->new_word, style->newline,
1937 plus_end - plus_begin, plus_begin);
1938 }
1939
1940 diff_words->current_plus = plus_end;
1941 diff_words->last_minus = minus_first;
1942 }
1943
1944 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1945 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1946 int *begin, int *end)
1947 {
1948 if (word_regex && *begin < buffer->size) {
1949 regmatch_t match[1];
1950 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1951 buffer->size - *begin, 1, match, 0)) {
1952 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1953 '\n', match[0].rm_eo - match[0].rm_so);
1954 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1955 *begin += match[0].rm_so;
1956 return *begin >= *end;
1957 }
1958 return -1;
1959 }
1960
1961 /* find the next word */
1962 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1963 (*begin)++;
1964 if (*begin >= buffer->size)
1965 return -1;
1966
1967 /* find the end of the word */
1968 *end = *begin + 1;
1969 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1970 (*end)++;
1971
1972 return 0;
1973 }
1974
1975 /*
1976 * This function splits the words in buffer->text, stores the list with
1977 * newline separator into out, and saves the offsets of the original words
1978 * in buffer->orig.
1979 */
1980 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1981 regex_t *word_regex)
1982 {
1983 int i, j;
1984 long alloc = 0;
1985
1986 out->size = 0;
1987 out->ptr = NULL;
1988
1989 /* fake an empty "0th" word */
1990 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1991 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1992 buffer->orig_nr = 1;
1993
1994 for (i = 0; i < buffer->text.size; i++) {
1995 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1996 return;
1997
1998 /* store original boundaries */
1999 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2000 buffer->orig_alloc);
2001 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2002 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2003 buffer->orig_nr++;
2004
2005 /* store one word */
2006 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2007 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2008 out->ptr[out->size + j - i] = '\n';
2009 out->size += j - i + 1;
2010
2011 i = j - 1;
2012 }
2013 }
2014
2015 /* this executes the word diff on the accumulated buffers */
2016 static void diff_words_show(struct diff_words_data *diff_words)
2017 {
2018 xpparam_t xpp;
2019 xdemitconf_t xecfg;
2020 mmfile_t minus, plus;
2021 struct diff_words_style *style = diff_words->style;
2022
2023 struct diff_options *opt = diff_words->opt;
2024 const char *line_prefix;
2025
2026 assert(opt);
2027 line_prefix = diff_line_prefix(opt);
2028
2029 /* special case: only removal */
2030 if (!diff_words->plus.text.size) {
2031 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2032 line_prefix, strlen(line_prefix), 0);
2033 fn_out_diff_words_write_helper(diff_words->opt,
2034 &style->old_word, style->newline,
2035 diff_words->minus.text.size,
2036 diff_words->minus.text.ptr);
2037 diff_words->minus.text.size = 0;
2038 return;
2039 }
2040
2041 diff_words->current_plus = diff_words->plus.text.ptr;
2042 diff_words->last_minus = 0;
2043
2044 memset(&xpp, 0, sizeof(xpp));
2045 memset(&xecfg, 0, sizeof(xecfg));
2046 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2047 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2048 xpp.flags = 0;
2049 /* as only the hunk header will be parsed, we need a 0-context */
2050 xecfg.ctxlen = 0;
2051 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
2052 &xpp, &xecfg))
2053 die("unable to generate word diff");
2054 free(minus.ptr);
2055 free(plus.ptr);
2056 if (diff_words->current_plus != diff_words->plus.text.ptr +
2057 diff_words->plus.text.size) {
2058 if (color_words_output_graph_prefix(diff_words))
2059 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2060 line_prefix, strlen(line_prefix), 0);
2061 fn_out_diff_words_write_helper(diff_words->opt,
2062 &style->ctx, style->newline,
2063 diff_words->plus.text.ptr + diff_words->plus.text.size
2064 - diff_words->current_plus, diff_words->current_plus);
2065 }
2066 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2067 }
2068
2069 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2070 static void diff_words_flush(struct emit_callback *ecbdata)
2071 {
2072 struct diff_options *wo = ecbdata->diff_words->opt;
2073
2074 if (ecbdata->diff_words->minus.text.size ||
2075 ecbdata->diff_words->plus.text.size)
2076 diff_words_show(ecbdata->diff_words);
2077
2078 if (wo->emitted_symbols) {
2079 struct diff_options *o = ecbdata->opt;
2080 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2081 int i;
2082
2083 /*
2084 * NEEDSWORK:
2085 * Instead of appending each, concat all words to a line?
2086 */
2087 for (i = 0; i < wol->nr; i++)
2088 append_emitted_diff_symbol(o, &wol->buf[i]);
2089
2090 for (i = 0; i < wol->nr; i++)
2091 free((void *)wol->buf[i].line);
2092
2093 wol->nr = 0;
2094 }
2095 }
2096
2097 static void diff_filespec_load_driver(struct diff_filespec *one)
2098 {
2099 /* Use already-loaded driver */
2100 if (one->driver)
2101 return;
2102
2103 if (S_ISREG(one->mode))
2104 one->driver = userdiff_find_by_path(one->path);
2105
2106 /* Fallback to default settings */
2107 if (!one->driver)
2108 one->driver = userdiff_find_by_name("default");
2109 }
2110
2111 static const char *userdiff_word_regex(struct diff_filespec *one)
2112 {
2113 diff_filespec_load_driver(one);
2114 return one->driver->word_regex;
2115 }
2116
2117 static void init_diff_words_data(struct emit_callback *ecbdata,
2118 struct diff_options *orig_opts,
2119 struct diff_filespec *one,
2120 struct diff_filespec *two)
2121 {
2122 int i;
2123 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2124 memcpy(o, orig_opts, sizeof(struct diff_options));
2125
2126 ecbdata->diff_words =
2127 xcalloc(1, sizeof(struct diff_words_data));
2128 ecbdata->diff_words->type = o->word_diff;
2129 ecbdata->diff_words->opt = o;
2130
2131 if (orig_opts->emitted_symbols)
2132 o->emitted_symbols =
2133 xcalloc(1, sizeof(struct emitted_diff_symbols));
2134
2135 if (!o->word_regex)
2136 o->word_regex = userdiff_word_regex(one);
2137 if (!o->word_regex)
2138 o->word_regex = userdiff_word_regex(two);
2139 if (!o->word_regex)
2140 o->word_regex = diff_word_regex_cfg;
2141 if (o->word_regex) {
2142 ecbdata->diff_words->word_regex = (regex_t *)
2143 xmalloc(sizeof(regex_t));
2144 if (regcomp(ecbdata->diff_words->word_regex,
2145 o->word_regex,
2146 REG_EXTENDED | REG_NEWLINE))
2147 die ("Invalid regular expression: %s",
2148 o->word_regex);
2149 }
2150 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2151 if (o->word_diff == diff_words_styles[i].type) {
2152 ecbdata->diff_words->style =
2153 &diff_words_styles[i];
2154 break;
2155 }
2156 }
2157 if (want_color(o->use_color)) {
2158 struct diff_words_style *st = ecbdata->diff_words->style;
2159 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2160 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2161 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2162 }
2163 }
2164
2165 static void free_diff_words_data(struct emit_callback *ecbdata)
2166 {
2167 if (ecbdata->diff_words) {
2168 diff_words_flush(ecbdata);
2169 free (ecbdata->diff_words->opt->emitted_symbols);
2170 free (ecbdata->diff_words->opt);
2171 free (ecbdata->diff_words->minus.text.ptr);
2172 free (ecbdata->diff_words->minus.orig);
2173 free (ecbdata->diff_words->plus.text.ptr);
2174 free (ecbdata->diff_words->plus.orig);
2175 if (ecbdata->diff_words->word_regex) {
2176 regfree(ecbdata->diff_words->word_regex);
2177 free(ecbdata->diff_words->word_regex);
2178 }
2179 FREE_AND_NULL(ecbdata->diff_words);
2180 }
2181 }
2182
2183 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2184 {
2185 if (want_color(diff_use_color))
2186 return diff_colors[ix];
2187 return "";
2188 }
2189
2190 const char *diff_line_prefix(struct diff_options *opt)
2191 {
2192 struct strbuf *msgbuf;
2193 if (!opt->output_prefix)
2194 return "";
2195
2196 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2197 return msgbuf->buf;
2198 }
2199
2200 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2201 {
2202 const char *cp;
2203 unsigned long allot;
2204 size_t l = len;
2205
2206 cp = line;
2207 allot = l;
2208 while (0 < l) {
2209 (void) utf8_width(&cp, &l);
2210 if (!cp)
2211 break; /* truncated in the middle? */
2212 }
2213 return allot - l;
2214 }
2215
2216 static void find_lno(const char *line, struct emit_callback *ecbdata)
2217 {
2218 const char *p;
2219 ecbdata->lno_in_preimage = 0;
2220 ecbdata->lno_in_postimage = 0;
2221 p = strchr(line, '-');
2222 if (!p)
2223 return; /* cannot happen */
2224 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2225 p = strchr(p, '+');
2226 if (!p)
2227 return; /* cannot happen */
2228 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2229 }
2230
2231 static void fn_out_consume(void *priv, char *line, unsigned long len)
2232 {
2233 struct emit_callback *ecbdata = priv;
2234 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2235 struct diff_options *o = ecbdata->opt;
2236
2237 o->found_changes = 1;
2238
2239 if (ecbdata->header) {
2240 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2241 ecbdata->header->buf, ecbdata->header->len, 0);
2242 strbuf_reset(ecbdata->header);
2243 ecbdata->header = NULL;
2244 }
2245
2246 if (ecbdata->label_path[0]) {
2247 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2248 ecbdata->label_path[0],
2249 strlen(ecbdata->label_path[0]), 0);
2250 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2251 ecbdata->label_path[1],
2252 strlen(ecbdata->label_path[1]), 0);
2253 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2254 }
2255
2256 if (diff_suppress_blank_empty
2257 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2258 line[0] = '\n';
2259 len = 1;
2260 }
2261
2262 if (line[0] == '@') {
2263 if (ecbdata->diff_words)
2264 diff_words_flush(ecbdata);
2265 len = sane_truncate_line(ecbdata, line, len);
2266 find_lno(line, ecbdata);
2267 emit_hunk_header(ecbdata, line, len);
2268 return;
2269 }
2270
2271 if (ecbdata->diff_words) {
2272 enum diff_symbol s =
2273 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2274 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2275 if (line[0] == '-') {
2276 diff_words_append(line, len,
2277 &ecbdata->diff_words->minus);
2278 return;
2279 } else if (line[0] == '+') {
2280 diff_words_append(line, len,
2281 &ecbdata->diff_words->plus);
2282 return;
2283 } else if (starts_with(line, "\\ ")) {
2284 /*
2285 * Eat the "no newline at eof" marker as if we
2286 * saw a "+" or "-" line with nothing on it,
2287 * and return without diff_words_flush() to
2288 * defer processing. If this is the end of
2289 * preimage, more "+" lines may come after it.
2290 */
2291 return;
2292 }
2293 diff_words_flush(ecbdata);
2294 emit_diff_symbol(o, s, line, len, 0);
2295 return;
2296 }
2297
2298 switch (line[0]) {
2299 case '+':
2300 ecbdata->lno_in_postimage++;
2301 emit_add_line(reset, ecbdata, line + 1, len - 1);
2302 break;
2303 case '-':
2304 ecbdata->lno_in_preimage++;
2305 emit_del_line(reset, ecbdata, line + 1, len - 1);
2306 break;
2307 case ' ':
2308 ecbdata->lno_in_postimage++;
2309 ecbdata->lno_in_preimage++;
2310 emit_context_line(reset, ecbdata, line + 1, len - 1);
2311 break;
2312 default:
2313 /* incomplete line at the end */
2314 ecbdata->lno_in_preimage++;
2315 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2316 line, len, 0);
2317 break;
2318 }
2319 }
2320
2321 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2322 {
2323 const char *old_name = a;
2324 const char *new_name = b;
2325 int pfx_length, sfx_length;
2326 int pfx_adjust_for_slash;
2327 int len_a = strlen(a);
2328 int len_b = strlen(b);
2329 int a_midlen, b_midlen;
2330 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2331 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2332
2333 if (qlen_a || qlen_b) {
2334 quote_c_style(a, name, NULL, 0);
2335 strbuf_addstr(name, " => ");
2336 quote_c_style(b, name, NULL, 0);
2337 return;
2338 }
2339
2340 /* Find common prefix */
2341 pfx_length = 0;
2342 while (*old_name && *new_name && *old_name == *new_name) {
2343 if (*old_name == '/')
2344 pfx_length = old_name - a + 1;
2345 old_name++;
2346 new_name++;
2347 }
2348
2349 /* Find common suffix */
2350 old_name = a + len_a;
2351 new_name = b + len_b;
2352 sfx_length = 0;
2353 /*
2354 * If there is a common prefix, it must end in a slash. In
2355 * that case we let this loop run 1 into the prefix to see the
2356 * same slash.
2357 *
2358 * If there is no common prefix, we cannot do this as it would
2359 * underrun the input strings.
2360 */
2361 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2362 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2363 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2364 *old_name == *new_name) {
2365 if (*old_name == '/')
2366 sfx_length = len_a - (old_name - a);
2367 old_name--;
2368 new_name--;
2369 }
2370
2371 /*
2372 * pfx{mid-a => mid-b}sfx
2373 * {pfx-a => pfx-b}sfx
2374 * pfx{sfx-a => sfx-b}
2375 * name-a => name-b
2376 */
2377 a_midlen = len_a - pfx_length - sfx_length;
2378 b_midlen = len_b - pfx_length - sfx_length;
2379 if (a_midlen < 0)
2380 a_midlen = 0;
2381 if (b_midlen < 0)
2382 b_midlen = 0;
2383
2384 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2385 if (pfx_length + sfx_length) {
2386 strbuf_add(name, a, pfx_length);
2387 strbuf_addch(name, '{');
2388 }
2389 strbuf_add(name, a + pfx_length, a_midlen);
2390 strbuf_addstr(name, " => ");
2391 strbuf_add(name, b + pfx_length, b_midlen);
2392 if (pfx_length + sfx_length) {
2393 strbuf_addch(name, '}');
2394 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2395 }
2396 }
2397
2398 struct diffstat_t {
2399 int nr;
2400 int alloc;
2401 struct diffstat_file {
2402 char *from_name;
2403 char *name;
2404 char *print_name;
2405 const char *comments;
2406 unsigned is_unmerged:1;
2407 unsigned is_binary:1;
2408 unsigned is_renamed:1;
2409 unsigned is_interesting:1;
2410 uintmax_t added, deleted;
2411 } **files;
2412 };
2413
2414 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2415 const char *name_a,
2416 const char *name_b)
2417 {
2418 struct diffstat_file *x;
2419 x = xcalloc(1, sizeof(*x));
2420 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2421 diffstat->files[diffstat->nr++] = x;
2422 if (name_b) {
2423 x->from_name = xstrdup(name_a);
2424 x->name = xstrdup(name_b);
2425 x->is_renamed = 1;
2426 }
2427 else {
2428 x->from_name = NULL;
2429 x->name = xstrdup(name_a);
2430 }
2431 return x;
2432 }
2433
2434 static void diffstat_consume(void *priv, char *line, unsigned long len)
2435 {
2436 struct diffstat_t *diffstat = priv;
2437 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2438
2439 if (line[0] == '+')
2440 x->added++;
2441 else if (line[0] == '-')
2442 x->deleted++;
2443 }
2444
2445 const char mime_boundary_leader[] = "------------";
2446
2447 static int scale_linear(int it, int width, int max_change)
2448 {
2449 if (!it)
2450 return 0;
2451 /*
2452 * make sure that at least one '-' or '+' is printed if
2453 * there is any change to this path. The easiest way is to
2454 * scale linearly as if the alloted width is one column shorter
2455 * than it is, and then add 1 to the result.
2456 */
2457 return 1 + (it * (width - 1) / max_change);
2458 }
2459
2460 static void show_graph(struct strbuf *out, char ch, int cnt,
2461 const char *set, const char *reset)
2462 {
2463 if (cnt <= 0)
2464 return;
2465 strbuf_addstr(out, set);
2466 strbuf_addchars(out, ch, cnt);
2467 strbuf_addstr(out, reset);
2468 }
2469
2470 static void fill_print_name(struct diffstat_file *file)
2471 {
2472 struct strbuf pname = STRBUF_INIT;
2473
2474 if (file->print_name)
2475 return;
2476
2477 if (file->is_renamed)
2478 pprint_rename(&pname, file->from_name, file->name);
2479 else
2480 quote_c_style(file->name, &pname, NULL, 0);
2481
2482 if (file->comments)
2483 strbuf_addf(&pname, " (%s)", file->comments);
2484
2485 file->print_name = strbuf_detach(&pname, NULL);
2486 }
2487
2488 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2489 int files, int insertions, int deletions)
2490 {
2491 struct strbuf sb = STRBUF_INIT;
2492
2493 if (!files) {
2494 assert(insertions == 0 && deletions == 0);
2495 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2496 NULL, 0, 0);
2497 return;
2498 }
2499
2500 strbuf_addf(&sb,
2501 (files == 1) ? " %d file changed" : " %d files changed",
2502 files);
2503
2504 /*
2505 * For binary diff, the caller may want to print "x files
2506 * changed" with insertions == 0 && deletions == 0.
2507 *
2508 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2509 * is probably less confusing (i.e skip over "2 files changed
2510 * but nothing about added/removed lines? Is this a bug in Git?").
2511 */
2512 if (insertions || deletions == 0) {
2513 strbuf_addf(&sb,
2514 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2515 insertions);
2516 }
2517
2518 if (deletions || insertions == 0) {
2519 strbuf_addf(&sb,
2520 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2521 deletions);
2522 }
2523 strbuf_addch(&sb, '\n');
2524 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2525 sb.buf, sb.len, 0);
2526 strbuf_release(&sb);
2527 }
2528
2529 void print_stat_summary(FILE *fp, int files,
2530 int insertions, int deletions)
2531 {
2532 struct diff_options o;
2533 memset(&o, 0, sizeof(o));
2534 o.file = fp;
2535
2536 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2537 }
2538
2539 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2540 {
2541 int i, len, add, del, adds = 0, dels = 0;
2542 uintmax_t max_change = 0, max_len = 0;
2543 int total_files = data->nr, count;
2544 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2545 const char *reset, *add_c, *del_c;
2546 int extra_shown = 0;
2547 const char *line_prefix = diff_line_prefix(options);
2548 struct strbuf out = STRBUF_INIT;
2549
2550 if (data->nr == 0)
2551 return;
2552
2553 count = options->stat_count ? options->stat_count : data->nr;
2554
2555 reset = diff_get_color_opt(options, DIFF_RESET);
2556 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2557 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2558
2559 /*
2560 * Find the longest filename and max number of changes
2561 */
2562 for (i = 0; (i < count) && (i < data->nr); i++) {
2563 struct diffstat_file *file = data->files[i];
2564 uintmax_t change = file->added + file->deleted;
2565
2566 if (!file->is_interesting && (change == 0)) {
2567 count++; /* not shown == room for one more */
2568 continue;
2569 }
2570 fill_print_name(file);
2571 len = strlen(file->print_name);
2572 if (max_len < len)
2573 max_len = len;
2574
2575 if (file->is_unmerged) {
2576 /* "Unmerged" is 8 characters */
2577 bin_width = bin_width < 8 ? 8 : bin_width;
2578 continue;
2579 }
2580 if (file->is_binary) {
2581 /* "Bin XXX -> YYY bytes" */
2582 int w = 14 + decimal_width(file->added)
2583 + decimal_width(file->deleted);
2584 bin_width = bin_width < w ? w : bin_width;
2585 /* Display change counts aligned with "Bin" */
2586 number_width = 3;
2587 continue;
2588 }
2589
2590 if (max_change < change)
2591 max_change = change;
2592 }
2593 count = i; /* where we can stop scanning in data->files[] */
2594
2595 /*
2596 * We have width = stat_width or term_columns() columns total.
2597 * We want a maximum of min(max_len, stat_name_width) for the name part.
2598 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2599 * We also need 1 for " " and 4 + decimal_width(max_change)
2600 * for " | NNNN " and one the empty column at the end, altogether
2601 * 6 + decimal_width(max_change).
2602 *
2603 * If there's not enough space, we will use the smaller of
2604 * stat_name_width (if set) and 5/8*width for the filename,
2605 * and the rest for constant elements + graph part, but no more
2606 * than stat_graph_width for the graph part.
2607 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2608 * for the standard terminal size).
2609 *
2610 * In other words: stat_width limits the maximum width, and
2611 * stat_name_width fixes the maximum width of the filename,
2612 * and is also used to divide available columns if there
2613 * aren't enough.
2614 *
2615 * Binary files are displayed with "Bin XXX -> YYY bytes"
2616 * instead of the change count and graph. This part is treated
2617 * similarly to the graph part, except that it is not
2618 * "scaled". If total width is too small to accommodate the
2619 * guaranteed minimum width of the filename part and the
2620 * separators and this message, this message will "overflow"
2621 * making the line longer than the maximum width.
2622 */
2623
2624 if (options->stat_width == -1)
2625 width = term_columns() - strlen(line_prefix);
2626 else
2627 width = options->stat_width ? options->stat_width : 80;
2628 number_width = decimal_width(max_change) > number_width ?
2629 decimal_width(max_change) : number_width;
2630
2631 if (options->stat_graph_width == -1)
2632 options->stat_graph_width = diff_stat_graph_width;
2633
2634 /*
2635 * Guarantee 3/8*16==6 for the graph part
2636 * and 5/8*16==10 for the filename part
2637 */
2638 if (width < 16 + 6 + number_width)
2639 width = 16 + 6 + number_width;
2640
2641 /*
2642 * First assign sizes that are wanted, ignoring available width.
2643 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2644 * starting from "XXX" should fit in graph_width.
2645 */
2646 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2647 if (options->stat_graph_width &&
2648 options->stat_graph_width < graph_width)
2649 graph_width = options->stat_graph_width;
2650
2651 name_width = (options->stat_name_width > 0 &&
2652 options->stat_name_width < max_len) ?
2653 options->stat_name_width : max_len;
2654
2655 /*
2656 * Adjust adjustable widths not to exceed maximum width
2657 */
2658 if (name_width + number_width + 6 + graph_width > width) {
2659 if (graph_width > width * 3/8 - number_width - 6) {
2660 graph_width = width * 3/8 - number_width - 6;
2661 if (graph_width < 6)
2662 graph_width = 6;
2663 }
2664
2665 if (options->stat_graph_width &&
2666 graph_width > options->stat_graph_width)
2667 graph_width = options->stat_graph_width;
2668 if (name_width > width - number_width - 6 - graph_width)
2669 name_width = width - number_width - 6 - graph_width;
2670 else
2671 graph_width = width - number_width - 6 - name_width;
2672 }
2673
2674 /*
2675 * From here name_width is the width of the name area,
2676 * and graph_width is the width of the graph area.
2677 * max_change is used to scale graph properly.
2678 */
2679 for (i = 0; i < count; i++) {
2680 const char *prefix = "";
2681 struct diffstat_file *file = data->files[i];
2682 char *name = file->print_name;
2683 uintmax_t added = file->added;
2684 uintmax_t deleted = file->deleted;
2685 int name_len;
2686
2687 if (!file->is_interesting && (added + deleted == 0))
2688 continue;
2689
2690 /*
2691 * "scale" the filename
2692 */
2693 len = name_width;
2694 name_len = strlen(name);
2695 if (name_width < name_len) {
2696 char *slash;
2697 prefix = "...";
2698 len -= 3;
2699 name += name_len - len;
2700 slash = strchr(name, '/');
2701 if (slash)
2702 name = slash;
2703 }
2704
2705 if (file->is_binary) {
2706 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2707 strbuf_addf(&out, " %*s", number_width, "Bin");
2708 if (!added && !deleted) {
2709 strbuf_addch(&out, '\n');
2710 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2711 out.buf, out.len, 0);
2712 strbuf_reset(&out);
2713 continue;
2714 }
2715 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2716 del_c, deleted, reset);
2717 strbuf_addstr(&out, " -> ");
2718 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2719 add_c, added, reset);
2720 strbuf_addstr(&out, " bytes\n");
2721 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2722 out.buf, out.len, 0);
2723 strbuf_reset(&out);
2724 continue;
2725 }
2726 else if (file->is_unmerged) {
2727 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2728 strbuf_addstr(&out, " Unmerged\n");
2729 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2730 out.buf, out.len, 0);
2731 strbuf_reset(&out);
2732 continue;
2733 }
2734
2735 /*
2736 * scale the add/delete
2737 */
2738 add = added;
2739 del = deleted;
2740
2741 if (graph_width <= max_change) {
2742 int total = scale_linear(add + del, graph_width, max_change);
2743 if (total < 2 && add && del)
2744 /* width >= 2 due to the sanity check */
2745 total = 2;
2746 if (add < del) {
2747 add = scale_linear(add, graph_width, max_change);
2748 del = total - add;
2749 } else {
2750 del = scale_linear(del, graph_width, max_change);
2751 add = total - del;
2752 }
2753 }
2754 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2755 strbuf_addf(&out, " %*"PRIuMAX"%s",
2756 number_width, added + deleted,
2757 added + deleted ? " " : "");
2758 show_graph(&out, '+', add, add_c, reset);
2759 show_graph(&out, '-', del, del_c, reset);
2760 strbuf_addch(&out, '\n');
2761 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2762 out.buf, out.len, 0);
2763 strbuf_reset(&out);
2764 }
2765
2766 for (i = 0; i < data->nr; i++) {
2767 struct diffstat_file *file = data->files[i];
2768 uintmax_t added = file->added;
2769 uintmax_t deleted = file->deleted;
2770
2771 if (file->is_unmerged ||
2772 (!file->is_interesting && (added + deleted == 0))) {
2773 total_files--;
2774 continue;
2775 }
2776
2777 if (!file->is_binary) {
2778 adds += added;
2779 dels += deleted;
2780 }
2781 if (i < count)
2782 continue;
2783 if (!extra_shown)
2784 emit_diff_symbol(options,
2785 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2786 NULL, 0, 0);
2787 extra_shown = 1;
2788 }
2789
2790 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2791 strbuf_release(&out);
2792 }
2793
2794 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2795 {
2796 int i, adds = 0, dels = 0, total_files = data->nr;
2797
2798 if (data->nr == 0)
2799 return;
2800
2801 for (i = 0; i < data->nr; i++) {
2802 int added = data->files[i]->added;
2803 int deleted = data->files[i]->deleted;
2804
2805 if (data->files[i]->is_unmerged ||
2806 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2807 total_files--;
2808 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2809 adds += added;
2810 dels += deleted;
2811 }
2812 }
2813 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2814 }
2815
2816 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2817 {
2818 int i;
2819
2820 if (data->nr == 0)
2821 return;
2822
2823 for (i = 0; i < data->nr; i++) {
2824 struct diffstat_file *file = data->files[i];
2825
2826 fprintf(options->file, "%s", diff_line_prefix(options));
2827
2828 if (file->is_binary)
2829 fprintf(options->file, "-\t-\t");
2830 else
2831 fprintf(options->file,
2832 "%"PRIuMAX"\t%"PRIuMAX"\t",
2833 file->added, file->deleted);
2834 if (options->line_termination) {
2835 fill_print_name(file);
2836 if (!file->is_renamed)
2837 write_name_quoted(file->name, options->file,
2838 options->line_termination);
2839 else {
2840 fputs(file->print_name, options->file);
2841 putc(options->line_termination, options->file);
2842 }
2843 } else {
2844 if (file->is_renamed) {
2845 putc('\0', options->file);
2846 write_name_quoted(file->from_name, options->file, '\0');
2847 }
2848 write_name_quoted(file->name, options->file, '\0');
2849 }
2850 }
2851 }
2852
2853 struct dirstat_file {
2854 const char *name;
2855 unsigned long changed;
2856 };
2857
2858 struct dirstat_dir {
2859 struct dirstat_file *files;
2860 int alloc, nr, permille, cumulative;
2861 };
2862
2863 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2864 unsigned long changed, const char *base, int baselen)
2865 {
2866 unsigned long sum_changes = 0;
2867 unsigned int sources = 0;
2868 const char *line_prefix = diff_line_prefix(opt);
2869
2870 while (dir->nr) {
2871 struct dirstat_file *f = dir->files;
2872 int namelen = strlen(f->name);
2873 unsigned long changes;
2874 char *slash;
2875
2876 if (namelen < baselen)
2877 break;
2878 if (memcmp(f->name, base, baselen))
2879 break;
2880 slash = strchr(f->name + baselen, '/');
2881 if (slash) {
2882 int newbaselen = slash + 1 - f->name;
2883 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2884 sources++;
2885 } else {
2886 changes = f->changed;
2887 dir->files++;
2888 dir->nr--;
2889 sources += 2;
2890 }
2891 sum_changes += changes;
2892 }
2893
2894 /*
2895 * We don't report dirstat's for
2896 * - the top level
2897 * - or cases where everything came from a single directory
2898 * under this directory (sources == 1).
2899 */
2900 if (baselen && sources != 1) {
2901 if (sum_changes) {
2902 int permille = sum_changes * 1000 / changed;
2903 if (permille >= dir->permille) {
2904 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2905 permille / 10, permille % 10, baselen, base);
2906 if (!dir->cumulative)
2907 return 0;
2908 }
2909 }
2910 }
2911 return sum_changes;
2912 }
2913
2914 static int dirstat_compare(const void *_a, const void *_b)
2915 {
2916 const struct dirstat_file *a = _a;
2917 const struct dirstat_file *b = _b;
2918 return strcmp(a->name, b->name);
2919 }
2920
2921 static void show_dirstat(struct diff_options *options)
2922 {
2923 int i;
2924 unsigned long changed;
2925 struct dirstat_dir dir;
2926 struct diff_queue_struct *q = &diff_queued_diff;
2927
2928 dir.files = NULL;
2929 dir.alloc = 0;
2930 dir.nr = 0;
2931 dir.permille = options->dirstat_permille;
2932 dir.cumulative = options->flags.dirstat_cumulative;
2933
2934 changed = 0;
2935 for (i = 0; i < q->nr; i++) {
2936 struct diff_filepair *p = q->queue[i];
2937 const char *name;
2938 unsigned long copied, added, damage;
2939 int content_changed;
2940
2941 name = p->two->path ? p->two->path : p->one->path;
2942
2943 if (p->one->oid_valid && p->two->oid_valid)
2944 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2945 else
2946 content_changed = 1;
2947
2948 if (!content_changed) {
2949 /*
2950 * The SHA1 has not changed, so pre-/post-content is
2951 * identical. We can therefore skip looking at the
2952 * file contents altogether.
2953 */
2954 damage = 0;
2955 goto found_damage;
2956 }
2957
2958 if (options->flags.dirstat_by_file) {
2959 /*
2960 * In --dirstat-by-file mode, we don't really need to
2961 * look at the actual file contents at all.
2962 * The fact that the SHA1 changed is enough for us to
2963 * add this file to the list of results
2964 * (with each file contributing equal damage).
2965 */
2966 damage = 1;
2967 goto found_damage;
2968 }
2969
2970 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2971 diff_populate_filespec(p->one, 0);
2972 diff_populate_filespec(p->two, 0);
2973 diffcore_count_changes(p->one, p->two, NULL, NULL,
2974 &copied, &added);
2975 diff_free_filespec_data(p->one);
2976 diff_free_filespec_data(p->two);
2977 } else if (DIFF_FILE_VALID(p->one)) {
2978 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2979 copied = added = 0;
2980 diff_free_filespec_data(p->one);
2981 } else if (DIFF_FILE_VALID(p->two)) {
2982 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2983 copied = 0;
2984 added = p->two->size;
2985 diff_free_filespec_data(p->two);
2986 } else
2987 continue;
2988
2989 /*
2990 * Original minus copied is the removed material,
2991 * added is the new material. They are both damages
2992 * made to the preimage.
2993 * If the resulting damage is zero, we know that
2994 * diffcore_count_changes() considers the two entries to
2995 * be identical, but since content_changed is true, we
2996 * know that there must have been _some_ kind of change,
2997 * so we force all entries to have damage > 0.
2998 */
2999 damage = (p->one->size - copied) + added;
3000 if (!damage)
3001 damage = 1;
3002
3003 found_damage:
3004 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3005 dir.files[dir.nr].name = name;
3006 dir.files[dir.nr].changed = damage;
3007 changed += damage;
3008 dir.nr++;
3009 }
3010
3011 /* This can happen even with many files, if everything was renames */
3012 if (!changed)
3013 return;
3014
3015 /* Show all directories with more than x% of the changes */
3016 QSORT(dir.files, dir.nr, dirstat_compare);
3017 gather_dirstat(options, &dir, changed, "", 0);
3018 }
3019
3020 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3021 {
3022 int i;
3023 unsigned long changed;
3024 struct dirstat_dir dir;
3025
3026 if (data->nr == 0)
3027 return;
3028
3029 dir.files = NULL;
3030 dir.alloc = 0;
3031 dir.nr = 0;
3032 dir.permille = options->dirstat_permille;
3033 dir.cumulative = options->flags.dirstat_cumulative;
3034
3035 changed = 0;
3036 for (i = 0; i < data->nr; i++) {
3037 struct diffstat_file *file = data->files[i];
3038 unsigned long damage = file->added + file->deleted;
3039 if (file->is_binary)
3040 /*
3041 * binary files counts bytes, not lines. Must find some
3042 * way to normalize binary bytes vs. textual lines.
3043 * The following heuristic assumes that there are 64
3044 * bytes per "line".
3045 * This is stupid and ugly, but very cheap...
3046 */
3047 damage = DIV_ROUND_UP(damage, 64);
3048 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3049 dir.files[dir.nr].name = file->name;
3050 dir.files[dir.nr].changed = damage;
3051 changed += damage;
3052 dir.nr++;
3053 }
3054
3055 /* This can happen even with many files, if everything was renames */
3056 if (!changed)
3057 return;
3058
3059 /* Show all directories with more than x% of the changes */
3060 QSORT(dir.files, dir.nr, dirstat_compare);
3061 gather_dirstat(options, &dir, changed, "", 0);
3062 }
3063
3064 static void free_diffstat_info(struct diffstat_t *diffstat)
3065 {
3066 int i;
3067 for (i = 0; i < diffstat->nr; i++) {
3068 struct diffstat_file *f = diffstat->files[i];
3069 free(f->print_name);
3070 free(f->name);
3071 free(f->from_name);
3072 free(f);
3073 }
3074 free(diffstat->files);
3075 }
3076
3077 struct checkdiff_t {
3078 const char *filename;
3079 int lineno;
3080 int conflict_marker_size;
3081 struct diff_options *o;
3082 unsigned ws_rule;
3083 unsigned status;
3084 };
3085
3086 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3087 {
3088 char firstchar;
3089 int cnt;
3090
3091 if (len < marker_size + 1)
3092 return 0;
3093 firstchar = line[0];
3094 switch (firstchar) {
3095 case '=': case '>': case '<': case '|':
3096 break;
3097 default:
3098 return 0;
3099 }
3100 for (cnt = 1; cnt < marker_size; cnt++)
3101 if (line[cnt] != firstchar)
3102 return 0;
3103 /* line[1] thru line[marker_size-1] are same as firstchar */
3104 if (len < marker_size + 1 || !isspace(line[marker_size]))
3105 return 0;
3106 return 1;
3107 }
3108
3109 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3110 {
3111 struct checkdiff_t *data = priv;
3112 int marker_size = data->conflict_marker_size;
3113 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3114 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3115 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3116 char *err;
3117 const char *line_prefix;
3118
3119 assert(data->o);
3120 line_prefix = diff_line_prefix(data->o);
3121
3122 if (line[0] == '+') {
3123 unsigned bad;
3124 data->lineno++;
3125 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3126 data->status |= 1;
3127 fprintf(data->o->file,
3128 "%s%s:%d: leftover conflict marker\n",
3129 line_prefix, data->filename, data->lineno);
3130 }
3131 bad = ws_check(line + 1, len - 1, data->ws_rule);
3132 if (!bad)
3133 return;
3134 data->status |= bad;
3135 err = whitespace_error_string(bad);
3136 fprintf(data->o->file, "%s%s:%d: %s.\n",
3137 line_prefix, data->filename, data->lineno, err);
3138 free(err);
3139 emit_line(data->o, set, reset, line, 1);
3140 ws_check_emit(line + 1, len - 1, data->ws_rule,
3141 data->o->file, set, reset, ws);
3142 } else if (line[0] == ' ') {
3143 data->lineno++;
3144 } else if (line[0] == '@') {
3145 char *plus = strchr(line, '+');
3146 if (plus)
3147 data->lineno = strtol(plus, NULL, 10) - 1;
3148 else
3149 die("invalid diff");
3150 }
3151 }
3152
3153 static unsigned char *deflate_it(char *data,
3154 unsigned long size,
3155 unsigned long *result_size)
3156 {
3157 int bound;
3158 unsigned char *deflated;
3159 git_zstream stream;
3160
3161 git_deflate_init(&stream, zlib_compression_level);
3162 bound = git_deflate_bound(&stream, size);
3163 deflated = xmalloc(bound);
3164 stream.next_out = deflated;
3165 stream.avail_out = bound;
3166
3167 stream.next_in = (unsigned char *)data;
3168 stream.avail_in = size;
3169 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3170 ; /* nothing */
3171 git_deflate_end(&stream);
3172 *result_size = stream.total_out;
3173 return deflated;
3174 }
3175
3176 static void emit_binary_diff_body(struct diff_options *o,
3177 mmfile_t *one, mmfile_t *two)
3178 {
3179 void *cp;
3180 void *delta;
3181 void *deflated;
3182 void *data;
3183 unsigned long orig_size;
3184 unsigned long delta_size;
3185 unsigned long deflate_size;
3186 unsigned long data_size;
3187
3188 /* We could do deflated delta, or we could do just deflated two,
3189 * whichever is smaller.
3190 */
3191 delta = NULL;
3192 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3193 if (one->size && two->size) {
3194 delta = diff_delta(one->ptr, one->size,
3195 two->ptr, two->size,
3196 &delta_size, deflate_size);
3197 if (delta) {
3198 void *to_free = delta;
3199 orig_size = delta_size;
3200 delta = deflate_it(delta, delta_size, &delta_size);
3201 free(to_free);
3202 }
3203 }
3204
3205 if (delta && delta_size < deflate_size) {
3206 char *s = xstrfmt("%lu", orig_size);
3207 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3208 s, strlen(s), 0);
3209 free(s);
3210 free(deflated);
3211 data = delta;
3212 data_size = delta_size;
3213 } else {
3214 char *s = xstrfmt("%lu", two->size);
3215 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3216 s, strlen(s), 0);
3217 free(s);
3218 free(delta);
3219 data = deflated;
3220 data_size = deflate_size;
3221 }
3222
3223 /* emit data encoded in base85 */
3224 cp = data;
3225 while (data_size) {
3226 int len;
3227 int bytes = (52 < data_size) ? 52 : data_size;
3228 char line[71];
3229 data_size -= bytes;
3230 if (bytes <= 26)
3231 line[0] = bytes + 'A' - 1;
3232 else
3233 line[0] = bytes - 26 + 'a' - 1;
3234 encode_85(line + 1, cp, bytes);
3235 cp = (char *) cp + bytes;
3236
3237 len = strlen(line);
3238 line[len++] = '\n';
3239 line[len] = '\0';
3240
3241 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3242 line, len, 0);
3243 }
3244 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3245 free(data);
3246 }
3247
3248 static void emit_binary_diff(struct diff_options *o,
3249 mmfile_t *one, mmfile_t *two)
3250 {
3251 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3252 emit_binary_diff_body(o, one, two);
3253 emit_binary_diff_body(o, two, one);
3254 }
3255
3256 int diff_filespec_is_binary(struct diff_filespec *one)
3257 {
3258 if (one->is_binary == -1) {
3259 diff_filespec_load_driver(one);
3260 if (one->driver->binary != -1)
3261 one->is_binary = one->driver->binary;
3262 else {
3263 if (!one->data && DIFF_FILE_VALID(one))
3264 diff_populate_filespec(one, CHECK_BINARY);
3265 if (one->is_binary == -1 && one->data)
3266 one->is_binary = buffer_is_binary(one->data,
3267 one->size);
3268 if (one->is_binary == -1)
3269 one->is_binary = 0;
3270 }
3271 }
3272 return one->is_binary;
3273 }
3274
3275 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
3276 {
3277 diff_filespec_load_driver(one);
3278 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3279 }
3280
3281 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3282 {
3283 if (!options->a_prefix)
3284 options->a_prefix = a;
3285 if (!options->b_prefix)
3286 options->b_prefix = b;
3287 }
3288
3289 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3290 {
3291 if (!DIFF_FILE_VALID(one))
3292 return NULL;
3293
3294 diff_filespec_load_driver(one);
3295 return userdiff_get_textconv(one->driver);
3296 }
3297
3298 static void builtin_diff(const char *name_a,
3299 const char *name_b,
3300 struct diff_filespec *one,
3301 struct diff_filespec *two,
3302 const char *xfrm_msg,
3303 int must_show_header,
3304 struct diff_options *o,
3305 int complete_rewrite)
3306 {
3307 mmfile_t mf1, mf2;
3308 const char *lbl[2];
3309 char *a_one, *b_two;
3310 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3311 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3312 const char *a_prefix, *b_prefix;
3313 struct userdiff_driver *textconv_one = NULL;
3314 struct userdiff_driver *textconv_two = NULL;
3315 struct strbuf header = STRBUF_INIT;
3316 const char *line_prefix = diff_line_prefix(o);
3317
3318 diff_set_mnemonic_prefix(o, "a/", "b/");
3319 if (o->flags.reverse_diff) {
3320 a_prefix = o->b_prefix;
3321 b_prefix = o->a_prefix;
3322 } else {
3323 a_prefix = o->a_prefix;
3324 b_prefix = o->b_prefix;
3325 }
3326
3327 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3328 (!one->mode || S_ISGITLINK(one->mode)) &&
3329 (!two->mode || S_ISGITLINK(two->mode))) {
3330 show_submodule_summary(o, one->path ? one->path : two->path,
3331 &one->oid, &two->oid,
3332 two->dirty_submodule);
3333 return;
3334 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3335 (!one->mode || S_ISGITLINK(one->mode)) &&
3336 (!two->mode || S_ISGITLINK(two->mode))) {
3337 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3338 &one->oid, &two->oid,
3339 two->dirty_submodule);
3340 return;
3341 }
3342
3343 if (o->flags.allow_textconv) {
3344 textconv_one = get_textconv(one);
3345 textconv_two = get_textconv(two);
3346 }
3347
3348 /* Never use a non-valid filename anywhere if at all possible */
3349 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3350 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3351
3352 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3353 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3354 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3355 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3356 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3357 if (lbl[0][0] == '/') {
3358 /* /dev/null */
3359 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3360 if (xfrm_msg)
3361 strbuf_addstr(&header, xfrm_msg);
3362 must_show_header = 1;
3363 }
3364 else if (lbl[1][0] == '/') {
3365 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3366 if (xfrm_msg)
3367 strbuf_addstr(&header, xfrm_msg);
3368 must_show_header = 1;
3369 }
3370 else {
3371 if (one->mode != two->mode) {
3372 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3373 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3374 must_show_header = 1;
3375 }
3376 if (xfrm_msg)
3377 strbuf_addstr(&header, xfrm_msg);
3378
3379 /*
3380 * we do not run diff between different kind
3381 * of objects.
3382 */
3383 if ((one->mode ^ two->mode) & S_IFMT)
3384 goto free_ab_and_return;
3385 if (complete_rewrite &&
3386 (textconv_one || !diff_filespec_is_binary(one)) &&
3387 (textconv_two || !diff_filespec_is_binary(two))) {
3388 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3389 header.buf, header.len, 0);
3390 strbuf_reset(&header);
3391 emit_rewrite_diff(name_a, name_b, one, two,
3392 textconv_one, textconv_two, o);
3393 o->found_changes = 1;
3394 goto free_ab_and_return;
3395 }
3396 }
3397
3398 if (o->irreversible_delete && lbl[1][0] == '/') {
3399 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3400 header.len, 0);
3401 strbuf_reset(&header);
3402 goto free_ab_and_return;
3403 } else if (!o->flags.text &&
3404 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3405 (!textconv_two && diff_filespec_is_binary(two)) )) {
3406 struct strbuf sb = STRBUF_INIT;
3407 if (!one->data && !two->data &&
3408 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3409 !o->flags.binary) {
3410 if (!oidcmp(&one->oid, &two->oid)) {
3411 if (must_show_header)
3412 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3413 header.buf, header.len,
3414 0);
3415 goto free_ab_and_return;
3416 }
3417 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3418 header.buf, header.len, 0);
3419 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3420 diff_line_prefix(o), lbl[0], lbl[1]);
3421 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3422 sb.buf, sb.len, 0);
3423 strbuf_release(&sb);
3424 goto free_ab_and_return;
3425 }
3426 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3427 die("unable to read files to diff");
3428 /* Quite common confusing case */
3429 if (mf1.size == mf2.size &&
3430 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3431 if (must_show_header)
3432 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3433 header.buf, header.len, 0);
3434 goto free_ab_and_return;
3435 }
3436 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3437 strbuf_reset(&header);
3438 if (o->flags.binary)
3439 emit_binary_diff(o, &mf1, &mf2);
3440 else {
3441 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3442 diff_line_prefix(o), lbl[0], lbl[1]);
3443 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3444 sb.buf, sb.len, 0);
3445 strbuf_release(&sb);
3446 }
3447 o->found_changes = 1;
3448 } else {
3449 /* Crazy xdl interfaces.. */
3450 const char *diffopts = getenv("GIT_DIFF_OPTS");
3451 const char *v;
3452 xpparam_t xpp;
3453 xdemitconf_t xecfg;
3454 struct emit_callback ecbdata;
3455 const struct userdiff_funcname *pe;
3456
3457 if (must_show_header) {
3458 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3459 header.buf, header.len, 0);
3460 strbuf_reset(&header);
3461 }
3462
3463 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3464 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3465
3466 pe = diff_funcname_pattern(one);
3467 if (!pe)
3468 pe = diff_funcname_pattern(two);
3469
3470 memset(&xpp, 0, sizeof(xpp));
3471 memset(&xecfg, 0, sizeof(xecfg));
3472 memset(&ecbdata, 0, sizeof(ecbdata));
3473 if (o->flags.suppress_diff_headers)
3474 lbl[0] = NULL;
3475 ecbdata.label_path = lbl;
3476 ecbdata.color_diff = want_color(o->use_color);
3477 ecbdata.ws_rule = whitespace_rule(name_b);
3478 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3479 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3480 ecbdata.opt = o;
3481 if (header.len && !o->flags.suppress_diff_headers)
3482 ecbdata.header = &header;
3483 xpp.flags = o->xdl_opts;
3484 xpp.anchors = o->anchors;
3485 xpp.anchors_nr = o->anchors_nr;
3486 xecfg.ctxlen = o->context;
3487 xecfg.interhunkctxlen = o->interhunkcontext;
3488 xecfg.flags = XDL_EMIT_FUNCNAMES;
3489 if (o->flags.funccontext)
3490 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3491 if (pe)
3492 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3493 if (!diffopts)
3494 ;
3495 else if (skip_prefix(diffopts, "--unified=", &v))
3496 xecfg.ctxlen = strtoul(v, NULL, 10);
3497 else if (skip_prefix(diffopts, "-u", &v))
3498 xecfg.ctxlen = strtoul(v, NULL, 10);
3499 if (o->word_diff)
3500 init_diff_words_data(&ecbdata, o, one, two);
3501 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3502 &xpp, &xecfg))
3503 die("unable to generate diff for %s", one->path);
3504 if (o->word_diff)
3505 free_diff_words_data(&ecbdata);
3506 if (textconv_one)
3507 free(mf1.ptr);
3508 if (textconv_two)
3509 free(mf2.ptr);
3510 xdiff_clear_find_func(&xecfg);
3511 }
3512
3513 free_ab_and_return:
3514 strbuf_release(&header);
3515 diff_free_filespec_data(one);
3516 diff_free_filespec_data(two);
3517 free(a_one);
3518 free(b_two);
3519 return;
3520 }
3521
3522 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3523 {
3524 if (!is_renamed) {
3525 if (p->status == DIFF_STATUS_ADDED) {
3526 if (S_ISLNK(p->two->mode))
3527 return "new +l";
3528 else if ((p->two->mode & 0777) == 0755)
3529 return "new +x";
3530 else
3531 return "new";
3532 } else if (p->status == DIFF_STATUS_DELETED)
3533 return "gone";
3534 }
3535 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3536 return "mode -l";
3537 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3538 return "mode +l";
3539 else if ((p->one->mode & 0777) == 0644 &&
3540 (p->two->mode & 0777) == 0755)
3541 return "mode +x";
3542 else if ((p->one->mode & 0777) == 0755 &&
3543 (p->two->mode & 0777) == 0644)
3544 return "mode -x";
3545 return NULL;
3546 }
3547
3548 static void builtin_diffstat(const char *name_a, const char *name_b,
3549 struct diff_filespec *one,
3550 struct diff_filespec *two,
3551 struct diffstat_t *diffstat,
3552 struct diff_options *o,
3553 struct diff_filepair *p)
3554 {
3555 mmfile_t mf1, mf2;
3556 struct diffstat_file *data;
3557 int same_contents;
3558 int complete_rewrite = 0;
3559
3560 if (!DIFF_PAIR_UNMERGED(p)) {
3561 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3562 complete_rewrite = 1;
3563 }
3564
3565 data = diffstat_add(diffstat, name_a, name_b);
3566 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3567 if (o->flags.stat_with_summary)
3568 data->comments = get_compact_summary(p, data->is_renamed);
3569
3570 if (!one || !two) {
3571 data->is_unmerged = 1;
3572 return;
3573 }
3574
3575 same_contents = !oidcmp(&one->oid, &two->oid);
3576
3577 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3578 data->is_binary = 1;
3579 if (same_contents) {
3580 data->added = 0;
3581 data->deleted = 0;
3582 } else {
3583 data->added = diff_filespec_size(two);
3584 data->deleted = diff_filespec_size(one);
3585 }
3586 }
3587
3588 else if (complete_rewrite) {
3589 diff_populate_filespec(one, 0);
3590 diff_populate_filespec(two, 0);
3591 data->deleted = count_lines(one->data, one->size);
3592 data->added = count_lines(two->data, two->size);
3593 }
3594
3595 else if (!same_contents) {
3596 /* Crazy xdl interfaces.. */
3597 xpparam_t xpp;
3598 xdemitconf_t xecfg;
3599
3600 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3601 die("unable to read files to diff");
3602
3603 memset(&xpp, 0, sizeof(xpp));
3604 memset(&xecfg, 0, sizeof(xecfg));
3605 xpp.flags = o->xdl_opts;
3606 xpp.anchors = o->anchors;
3607 xpp.anchors_nr = o->anchors_nr;
3608 xecfg.ctxlen = o->context;
3609 xecfg.interhunkctxlen = o->interhunkcontext;
3610 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3611 &xpp, &xecfg))
3612 die("unable to generate diffstat for %s", one->path);
3613 }
3614
3615 diff_free_filespec_data(one);
3616 diff_free_filespec_data(two);
3617 }
3618
3619 static void builtin_checkdiff(const char *name_a, const char *name_b,
3620 const char *attr_path,
3621 struct diff_filespec *one,
3622 struct diff_filespec *two,
3623 struct diff_options *o)
3624 {
3625 mmfile_t mf1, mf2;
3626 struct checkdiff_t data;
3627
3628 if (!two)
3629 return;
3630
3631 memset(&data, 0, sizeof(data));
3632 data.filename = name_b ? name_b : name_a;
3633 data.lineno = 0;
3634 data.o = o;
3635 data.ws_rule = whitespace_rule(attr_path);
3636 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3637
3638 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3639 die("unable to read files to diff");
3640
3641 /*
3642 * All the other codepaths check both sides, but not checking
3643 * the "old" side here is deliberate. We are checking the newly
3644 * introduced changes, and as long as the "new" side is text, we
3645 * can and should check what it introduces.
3646 */
3647 if (diff_filespec_is_binary(two))
3648 goto free_and_return;
3649 else {
3650 /* Crazy xdl interfaces.. */
3651 xpparam_t xpp;
3652 xdemitconf_t xecfg;
3653
3654 memset(&xpp, 0, sizeof(xpp));
3655 memset(&xecfg, 0, sizeof(xecfg));
3656 xecfg.ctxlen = 1; /* at least one context line */
3657 xpp.flags = 0;
3658 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3659 &xpp, &xecfg))
3660 die("unable to generate checkdiff for %s", one->path);
3661
3662 if (data.ws_rule & WS_BLANK_AT_EOF) {
3663 struct emit_callback ecbdata;
3664 int blank_at_eof;
3665
3666 ecbdata.ws_rule = data.ws_rule;
3667 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3668 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3669
3670 if (blank_at_eof) {
3671 static char *err;
3672 if (!err)
3673 err = whitespace_error_string(WS_BLANK_AT_EOF);
3674 fprintf(o->file, "%s:%d: %s.\n",
3675 data.filename, blank_at_eof, err);
3676 data.status = 1; /* report errors */
3677 }
3678 }
3679 }
3680 free_and_return:
3681 diff_free_filespec_data(one);
3682 diff_free_filespec_data(two);
3683 if (data.status)
3684 o->flags.check_failed = 1;
3685 }
3686
3687 struct diff_filespec *alloc_filespec(const char *path)
3688 {
3689 struct diff_filespec *spec;
3690
3691 FLEXPTR_ALLOC_STR(spec, path, path);
3692 spec->count = 1;
3693 spec->is_binary = -1;
3694 return spec;
3695 }
3696
3697 void free_filespec(struct diff_filespec *spec)
3698 {
3699 if (!--spec->count) {
3700 diff_free_filespec_data(spec);
3701 free(spec);
3702 }
3703 }
3704
3705 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3706 int oid_valid, unsigned short mode)
3707 {
3708 if (mode) {
3709 spec->mode = canon_mode(mode);
3710 oidcpy(&spec->oid, oid);
3711 spec->oid_valid = oid_valid;
3712 }
3713 }
3714
3715 /*
3716 * Given a name and sha1 pair, if the index tells us the file in
3717 * the work tree has that object contents, return true, so that
3718 * prepare_temp_file() does not have to inflate and extract.
3719 */
3720 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3721 {
3722 const struct cache_entry *ce;
3723 struct stat st;
3724 int pos, len;
3725
3726 /*
3727 * We do not read the cache ourselves here, because the
3728 * benchmark with my previous version that always reads cache
3729 * shows that it makes things worse for diff-tree comparing
3730 * two linux-2.6 kernel trees in an already checked out work
3731 * tree. This is because most diff-tree comparisons deal with
3732 * only a small number of files, while reading the cache is
3733 * expensive for a large project, and its cost outweighs the
3734 * savings we get by not inflating the object to a temporary
3735 * file. Practically, this code only helps when we are used
3736 * by diff-cache --cached, which does read the cache before
3737 * calling us.
3738 */
3739 if (!active_cache)
3740 return 0;
3741
3742 /* We want to avoid the working directory if our caller
3743 * doesn't need the data in a normal file, this system
3744 * is rather slow with its stat/open/mmap/close syscalls,
3745 * and the object is contained in a pack file. The pack
3746 * is probably already open and will be faster to obtain
3747 * the data through than the working directory. Loose
3748 * objects however would tend to be slower as they need
3749 * to be individually opened and inflated.
3750 */
3751 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3752 return 0;
3753
3754 /*
3755 * Similarly, if we'd have to convert the file contents anyway, that
3756 * makes the optimization not worthwhile.
3757 */
3758 if (!want_file && would_convert_to_git(&the_index, name))
3759 return 0;
3760
3761 len = strlen(name);
3762 pos = cache_name_pos(name, len);
3763 if (pos < 0)
3764 return 0;
3765 ce = active_cache[pos];
3766
3767 /*
3768 * This is not the sha1 we are looking for, or
3769 * unreusable because it is not a regular file.
3770 */
3771 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3772 return 0;
3773
3774 /*
3775 * If ce is marked as "assume unchanged", there is no
3776 * guarantee that work tree matches what we are looking for.
3777 */
3778 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3779 return 0;
3780
3781 /*
3782 * If ce matches the file in the work tree, we can reuse it.
3783 */
3784 if (ce_uptodate(ce) ||
3785 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3786 return 1;
3787
3788 return 0;
3789 }
3790
3791 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3792 {
3793 struct strbuf buf = STRBUF_INIT;
3794 char *dirty = "";
3795
3796 /* Are we looking at the work tree? */
3797 if (s->dirty_submodule)
3798 dirty = "-dirty";
3799
3800 strbuf_addf(&buf, "Subproject commit %s%s\n",
3801 oid_to_hex(&s->oid), dirty);
3802 s->size = buf.len;
3803 if (size_only) {
3804 s->data = NULL;
3805 strbuf_release(&buf);
3806 } else {
3807 s->data = strbuf_detach(&buf, NULL);
3808 s->should_free = 1;
3809 }
3810 return 0;
3811 }
3812
3813 /*
3814 * While doing rename detection and pickaxe operation, we may need to
3815 * grab the data for the blob (or file) for our own in-core comparison.
3816 * diff_filespec has data and size fields for this purpose.
3817 */
3818 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3819 {
3820 int size_only = flags & CHECK_SIZE_ONLY;
3821 int err = 0;
3822 int conv_flags = global_conv_flags_eol;
3823 /*
3824 * demote FAIL to WARN to allow inspecting the situation
3825 * instead of refusing.
3826 */
3827 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3828 conv_flags = CONV_EOL_RNDTRP_WARN;
3829
3830 if (!DIFF_FILE_VALID(s))
3831 die("internal error: asking to populate invalid file.");
3832 if (S_ISDIR(s->mode))
3833 return -1;
3834
3835 if (s->data)
3836 return 0;
3837
3838 if (size_only && 0 < s->size)
3839 return 0;
3840
3841 if (S_ISGITLINK(s->mode))
3842 return diff_populate_gitlink(s, size_only);
3843
3844 if (!s->oid_valid ||
3845 reuse_worktree_file(s->path, &s->oid, 0)) {
3846 struct strbuf buf = STRBUF_INIT;
3847 struct stat st;
3848 int fd;
3849
3850 if (lstat(s->path, &st) < 0) {
3851 err_empty:
3852 err = -1;
3853 empty:
3854 s->data = (char *)"";
3855 s->size = 0;
3856 return err;
3857 }
3858 s->size = xsize_t(st.st_size);
3859 if (!s->size)
3860 goto empty;
3861 if (S_ISLNK(st.st_mode)) {
3862 struct strbuf sb = STRBUF_INIT;
3863
3864 if (strbuf_readlink(&sb, s->path, s->size))
3865 goto err_empty;
3866 s->size = sb.len;
3867 s->data = strbuf_detach(&sb, NULL);
3868 s->should_free = 1;
3869 return 0;
3870 }
3871
3872 /*
3873 * Even if the caller would be happy with getting
3874 * only the size, we cannot return early at this
3875 * point if the path requires us to run the content
3876 * conversion.
3877 */
3878 if (size_only && !would_convert_to_git(&the_index, s->path))
3879 return 0;
3880
3881 /*
3882 * Note: this check uses xsize_t(st.st_size) that may
3883 * not be the true size of the blob after it goes
3884 * through convert_to_git(). This may not strictly be
3885 * correct, but the whole point of big_file_threshold
3886 * and is_binary check being that we want to avoid
3887 * opening the file and inspecting the contents, this
3888 * is probably fine.
3889 */
3890 if ((flags & CHECK_BINARY) &&
3891 s->size > big_file_threshold && s->is_binary == -1) {
3892 s->is_binary = 1;
3893 return 0;
3894 }
3895 fd = open(s->path, O_RDONLY);
3896 if (fd < 0)
3897 goto err_empty;
3898 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3899 close(fd);
3900 s->should_munmap = 1;
3901
3902 /*
3903 * Convert from working tree format to canonical git format
3904 */
3905 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
3906 size_t size = 0;
3907 munmap(s->data, s->size);
3908 s->should_munmap = 0;
3909 s->data = strbuf_detach(&buf, &size);
3910 s->size = size;
3911 s->should_free = 1;
3912 }
3913 }
3914 else {
3915 enum object_type type;
3916 if (size_only || (flags & CHECK_BINARY)) {
3917 type = oid_object_info(the_repository, &s->oid,
3918 &s->size);
3919 if (type < 0)
3920 die("unable to read %s",
3921 oid_to_hex(&s->oid));
3922 if (size_only)
3923 return 0;
3924 if (s->size > big_file_threshold && s->is_binary == -1) {
3925 s->is_binary = 1;
3926 return 0;
3927 }
3928 }
3929 s->data = read_object_file(&s->oid, &type, &s->size);
3930 if (!s->data)
3931 die("unable to read %s", oid_to_hex(&s->oid));
3932 s->should_free = 1;
3933 }
3934 return 0;
3935 }
3936
3937 void diff_free_filespec_blob(struct diff_filespec *s)
3938 {
3939 if (s->should_free)
3940 free(s->data);
3941 else if (s->should_munmap)
3942 munmap(s->data, s->size);
3943
3944 if (s->should_free || s->should_munmap) {
3945 s->should_free = s->should_munmap = 0;
3946 s->data = NULL;
3947 }
3948 }
3949
3950 void diff_free_filespec_data(struct diff_filespec *s)
3951 {
3952 diff_free_filespec_blob(s);
3953 FREE_AND_NULL(s->cnt_data);
3954 }
3955
3956 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3957 void *blob,
3958 unsigned long size,
3959 const struct object_id *oid,
3960 int mode)
3961 {
3962 struct strbuf buf = STRBUF_INIT;
3963 struct strbuf tempfile = STRBUF_INIT;
3964 char *path_dup = xstrdup(path);
3965 const char *base = basename(path_dup);
3966
3967 /* Generate "XXXXXX_basename.ext" */
3968 strbuf_addstr(&tempfile, "XXXXXX_");
3969 strbuf_addstr(&tempfile, base);
3970
3971 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
3972 if (!temp->tempfile)
3973 die_errno("unable to create temp-file");
3974 if (convert_to_working_tree(path,
3975 (const char *)blob, (size_t)size, &buf)) {
3976 blob = buf.buf;
3977 size = buf.len;
3978 }
3979 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3980 close_tempfile_gently(temp->tempfile))
3981 die_errno("unable to write temp-file");
3982 temp->name = get_tempfile_path(temp->tempfile);
3983 oid_to_hex_r(temp->hex, oid);
3984 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3985 strbuf_release(&buf);
3986 strbuf_release(&tempfile);
3987 free(path_dup);
3988 }
3989
3990 static struct diff_tempfile *prepare_temp_file(const char *name,
3991 struct diff_filespec *one)
3992 {
3993 struct diff_tempfile *temp = claim_diff_tempfile();
3994
3995 if (!DIFF_FILE_VALID(one)) {
3996 not_a_valid_file:
3997 /* A '-' entry produces this for file-2, and
3998 * a '+' entry produces this for file-1.
3999 */
4000 temp->name = "/dev/null";
4001 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4002 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4003 return temp;
4004 }
4005
4006 if (!S_ISGITLINK(one->mode) &&
4007 (!one->oid_valid ||
4008 reuse_worktree_file(name, &one->oid, 1))) {
4009 struct stat st;
4010 if (lstat(name, &st) < 0) {
4011 if (errno == ENOENT)
4012 goto not_a_valid_file;
4013 die_errno("stat(%s)", name);
4014 }
4015 if (S_ISLNK(st.st_mode)) {
4016 struct strbuf sb = STRBUF_INIT;
4017 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4018 die_errno("readlink(%s)", name);
4019 prep_temp_blob(name, temp, sb.buf, sb.len,
4020 (one->oid_valid ?
4021 &one->oid : &null_oid),
4022 (one->oid_valid ?
4023 one->mode : S_IFLNK));
4024 strbuf_release(&sb);
4025 }
4026 else {
4027 /* we can borrow from the file in the work tree */
4028 temp->name = name;
4029 if (!one->oid_valid)
4030 oid_to_hex_r(temp->hex, &null_oid);
4031 else
4032 oid_to_hex_r(temp->hex, &one->oid);
4033 /* Even though we may sometimes borrow the
4034 * contents from the work tree, we always want
4035 * one->mode. mode is trustworthy even when
4036 * !(one->oid_valid), as long as
4037 * DIFF_FILE_VALID(one).
4038 */
4039 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4040 }
4041 return temp;
4042 }
4043 else {
4044 if (diff_populate_filespec(one, 0))
4045 die("cannot read data blob for %s", one->path);
4046 prep_temp_blob(name, temp, one->data, one->size,
4047 &one->oid, one->mode);
4048 }
4049 return temp;
4050 }
4051
4052 static void add_external_diff_name(struct argv_array *argv,
4053 const char *name,
4054 struct diff_filespec *df)
4055 {
4056 struct diff_tempfile *temp = prepare_temp_file(name, df);
4057 argv_array_push(argv, temp->name);
4058 argv_array_push(argv, temp->hex);
4059 argv_array_push(argv, temp->mode);
4060 }
4061
4062 /* An external diff command takes:
4063 *
4064 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4065 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4066 *
4067 */
4068 static void run_external_diff(const char *pgm,
4069 const char *name,
4070 const char *other,
4071 struct diff_filespec *one,
4072 struct diff_filespec *two,
4073 const char *xfrm_msg,
4074 int complete_rewrite,
4075 struct diff_options *o)
4076 {
4077 struct argv_array argv = ARGV_ARRAY_INIT;
4078 struct argv_array env = ARGV_ARRAY_INIT;
4079 struct diff_queue_struct *q = &diff_queued_diff;
4080
4081 argv_array_push(&argv, pgm);
4082 argv_array_push(&argv, name);
4083
4084 if (one && two) {
4085 add_external_diff_name(&argv, name, one);
4086 if (!other)
4087 add_external_diff_name(&argv, name, two);
4088 else {
4089 add_external_diff_name(&argv, other, two);
4090 argv_array_push(&argv, other);
4091 argv_array_push(&argv, xfrm_msg);
4092 }
4093 }
4094
4095 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4096 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4097
4098 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4099 die(_("external diff died, stopping at %s"), name);
4100
4101 remove_tempfile();
4102 argv_array_clear(&argv);
4103 argv_array_clear(&env);
4104 }
4105
4106 static int similarity_index(struct diff_filepair *p)
4107 {
4108 return p->score * 100 / MAX_SCORE;
4109 }
4110
4111 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4112 {
4113 if (startup_info->have_repository)
4114 return find_unique_abbrev(oid, abbrev);
4115 else {
4116 char *hex = oid_to_hex(oid);
4117 if (abbrev < 0)
4118 abbrev = FALLBACK_DEFAULT_ABBREV;
4119 if (abbrev > the_hash_algo->hexsz)
4120 BUG("oid abbreviation out of range: %d", abbrev);
4121 if (abbrev)
4122 hex[abbrev] = '\0';
4123 return hex;
4124 }
4125 }
4126
4127 static void fill_metainfo(struct strbuf *msg,
4128 const char *name,
4129 const char *other,
4130 struct diff_filespec *one,
4131 struct diff_filespec *two,
4132 struct diff_options *o,
4133 struct diff_filepair *p,
4134 int *must_show_header,
4135 int use_color)
4136 {
4137 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4138 const char *reset = diff_get_color(use_color, DIFF_RESET);
4139 const char *line_prefix = diff_line_prefix(o);
4140
4141 *must_show_header = 1;
4142 strbuf_init(msg, PATH_MAX * 2 + 300);
4143 switch (p->status) {
4144 case DIFF_STATUS_COPIED:
4145 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4146 line_prefix, set, similarity_index(p));
4147 strbuf_addf(msg, "%s\n%s%scopy from ",
4148 reset, line_prefix, set);
4149 quote_c_style(name, msg, NULL, 0);
4150 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4151 quote_c_style(other, msg, NULL, 0);
4152 strbuf_addf(msg, "%s\n", reset);
4153 break;
4154 case DIFF_STATUS_RENAMED:
4155 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4156 line_prefix, set, similarity_index(p));
4157 strbuf_addf(msg, "%s\n%s%srename from ",
4158 reset, line_prefix, set);
4159 quote_c_style(name, msg, NULL, 0);
4160 strbuf_addf(msg, "%s\n%s%srename to ",
4161 reset, line_prefix, set);
4162 quote_c_style(other, msg, NULL, 0);
4163 strbuf_addf(msg, "%s\n", reset);
4164 break;
4165 case DIFF_STATUS_MODIFIED:
4166 if (p->score) {
4167 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4168 line_prefix,
4169 set, similarity_index(p), reset);
4170 break;
4171 }
4172 /* fallthru */
4173 default:
4174 *must_show_header = 0;
4175 }
4176 if (one && two && oidcmp(&one->oid, &two->oid)) {
4177 const unsigned hexsz = the_hash_algo->hexsz;
4178 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4179
4180 if (o->flags.binary) {
4181 mmfile_t mf;
4182 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
4183 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
4184 abbrev = hexsz;
4185 }
4186 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4187 diff_abbrev_oid(&one->oid, abbrev),
4188 diff_abbrev_oid(&two->oid, abbrev));
4189 if (one->mode == two->mode)
4190 strbuf_addf(msg, " %06o", one->mode);
4191 strbuf_addf(msg, "%s\n", reset);
4192 }
4193 }
4194
4195 static void run_diff_cmd(const char *pgm,
4196 const char *name,
4197 const char *other,
4198 const char *attr_path,
4199 struct diff_filespec *one,
4200 struct diff_filespec *two,
4201 struct strbuf *msg,
4202 struct diff_options *o,
4203 struct diff_filepair *p)
4204 {
4205 const char *xfrm_msg = NULL;
4206 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4207 int must_show_header = 0;
4208
4209
4210 if (o->flags.allow_external) {
4211 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
4212 if (drv && drv->external)
4213 pgm = drv->external;
4214 }
4215
4216 if (msg) {
4217 /*
4218 * don't use colors when the header is intended for an
4219 * external diff driver
4220 */
4221 fill_metainfo(msg, name, other, one, two, o, p,
4222 &must_show_header,
4223 want_color(o->use_color) && !pgm);
4224 xfrm_msg = msg->len ? msg->buf : NULL;
4225 }
4226
4227 if (pgm) {
4228 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4229 complete_rewrite, o);
4230 return;
4231 }
4232 if (one && two)
4233 builtin_diff(name, other ? other : name,
4234 one, two, xfrm_msg, must_show_header,
4235 o, complete_rewrite);
4236 else
4237 fprintf(o->file, "* Unmerged path %s\n", name);
4238 }
4239
4240 static void diff_fill_oid_info(struct diff_filespec *one)
4241 {
4242 if (DIFF_FILE_VALID(one)) {
4243 if (!one->oid_valid) {
4244 struct stat st;
4245 if (one->is_stdin) {
4246 oidclr(&one->oid);
4247 return;
4248 }
4249 if (lstat(one->path, &st) < 0)
4250 die_errno("stat '%s'", one->path);
4251 if (index_path(&one->oid, one->path, &st, 0))
4252 die("cannot hash %s", one->path);
4253 }
4254 }
4255 else
4256 oidclr(&one->oid);
4257 }
4258
4259 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4260 {
4261 /* Strip the prefix but do not molest /dev/null and absolute paths */
4262 if (*namep && **namep != '/') {
4263 *namep += prefix_length;
4264 if (**namep == '/')
4265 ++*namep;
4266 }
4267 if (*otherp && **otherp != '/') {
4268 *otherp += prefix_length;
4269 if (**otherp == '/')
4270 ++*otherp;
4271 }
4272 }
4273
4274 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4275 {
4276 const char *pgm = external_diff();
4277 struct strbuf msg;
4278 struct diff_filespec *one = p->one;
4279 struct diff_filespec *two = p->two;
4280 const char *name;
4281 const char *other;
4282 const char *attr_path;
4283
4284 name = one->path;
4285 other = (strcmp(name, two->path) ? two->path : NULL);
4286 attr_path = name;
4287 if (o->prefix_length)
4288 strip_prefix(o->prefix_length, &name, &other);
4289
4290 if (!o->flags.allow_external)
4291 pgm = NULL;
4292
4293 if (DIFF_PAIR_UNMERGED(p)) {
4294 run_diff_cmd(pgm, name, NULL, attr_path,
4295 NULL, NULL, NULL, o, p);
4296 return;
4297 }
4298
4299 diff_fill_oid_info(one);
4300 diff_fill_oid_info(two);
4301
4302 if (!pgm &&
4303 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4304 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4305 /*
4306 * a filepair that changes between file and symlink
4307 * needs to be split into deletion and creation.
4308 */
4309 struct diff_filespec *null = alloc_filespec(two->path);
4310 run_diff_cmd(NULL, name, other, attr_path,
4311 one, null, &msg, o, p);
4312 free(null);
4313 strbuf_release(&msg);
4314
4315 null = alloc_filespec(one->path);
4316 run_diff_cmd(NULL, name, other, attr_path,
4317 null, two, &msg, o, p);
4318 free(null);
4319 }
4320 else
4321 run_diff_cmd(pgm, name, other, attr_path,
4322 one, two, &msg, o, p);
4323
4324 strbuf_release(&msg);
4325 }
4326
4327 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4328 struct diffstat_t *diffstat)
4329 {
4330 const char *name;
4331 const char *other;
4332
4333 if (DIFF_PAIR_UNMERGED(p)) {
4334 /* unmerged */
4335 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4336 return;
4337 }
4338
4339 name = p->one->path;
4340 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4341
4342 if (o->prefix_length)
4343 strip_prefix(o->prefix_length, &name, &other);
4344
4345 diff_fill_oid_info(p->one);
4346 diff_fill_oid_info(p->two);
4347
4348 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4349 }
4350
4351 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4352 {
4353 const char *name;
4354 const char *other;
4355 const char *attr_path;
4356
4357 if (DIFF_PAIR_UNMERGED(p)) {
4358 /* unmerged */
4359 return;
4360 }
4361
4362 name = p->one->path;
4363 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4364 attr_path = other ? other : name;
4365
4366 if (o->prefix_length)
4367 strip_prefix(o->prefix_length, &name, &other);
4368
4369 diff_fill_oid_info(p->one);
4370 diff_fill_oid_info(p->two);
4371
4372 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4373 }
4374
4375 void diff_setup(struct diff_options *options)
4376 {
4377 memcpy(options, &default_diff_options, sizeof(*options));
4378
4379 options->file = stdout;
4380
4381 options->abbrev = DEFAULT_ABBREV;
4382 options->line_termination = '\n';
4383 options->break_opt = -1;
4384 options->rename_limit = -1;
4385 options->dirstat_permille = diff_dirstat_permille_default;
4386 options->context = diff_context_default;
4387 options->interhunkcontext = diff_interhunk_context_default;
4388 options->ws_error_highlight = ws_error_highlight_default;
4389 options->flags.rename_empty = 1;
4390 options->objfind = NULL;
4391
4392 /* pathchange left =NULL by default */
4393 options->change = diff_change;
4394 options->add_remove = diff_addremove;
4395 options->use_color = diff_use_color_default;
4396 options->detect_rename = diff_detect_rename_default;
4397 options->xdl_opts |= diff_algorithm;
4398 if (diff_indent_heuristic)
4399 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4400
4401 options->orderfile = diff_order_file_cfg;
4402
4403 if (diff_no_prefix) {
4404 options->a_prefix = options->b_prefix = "";
4405 } else if (!diff_mnemonic_prefix) {
4406 options->a_prefix = "a/";
4407 options->b_prefix = "b/";
4408 }
4409
4410 options->color_moved = diff_color_moved_default;
4411 options->color_moved_ws_handling = diff_color_moved_ws_default;
4412 }
4413
4414 void diff_setup_done(struct diff_options *options)
4415 {
4416 unsigned check_mask = DIFF_FORMAT_NAME |
4417 DIFF_FORMAT_NAME_STATUS |
4418 DIFF_FORMAT_CHECKDIFF |
4419 DIFF_FORMAT_NO_OUTPUT;
4420 /*
4421 * This must be signed because we're comparing against a potentially
4422 * negative value.
4423 */
4424 const int hexsz = the_hash_algo->hexsz;
4425
4426 if (options->set_default)
4427 options->set_default(options);
4428
4429 if (HAS_MULTI_BITS(options->output_format & check_mask))
4430 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4431
4432 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4433 die(_("-G, -S and --find-object are mutually exclusive"));
4434
4435 /*
4436 * Most of the time we can say "there are changes"
4437 * only by checking if there are changed paths, but
4438 * --ignore-whitespace* options force us to look
4439 * inside contents.
4440 */
4441
4442 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4443 options->flags.diff_from_contents = 1;
4444 else
4445 options->flags.diff_from_contents = 0;
4446
4447 if (options->flags.find_copies_harder)
4448 options->detect_rename = DIFF_DETECT_COPY;
4449
4450 if (!options->flags.relative_name)
4451 options->prefix = NULL;
4452 if (options->prefix)
4453 options->prefix_length = strlen(options->prefix);
4454 else
4455 options->prefix_length = 0;
4456
4457 if (options->output_format & (DIFF_FORMAT_NAME |
4458 DIFF_FORMAT_NAME_STATUS |
4459 DIFF_FORMAT_CHECKDIFF |
4460 DIFF_FORMAT_NO_OUTPUT))
4461 options->output_format &= ~(DIFF_FORMAT_RAW |
4462 DIFF_FORMAT_NUMSTAT |
4463 DIFF_FORMAT_DIFFSTAT |
4464 DIFF_FORMAT_SHORTSTAT |
4465 DIFF_FORMAT_DIRSTAT |
4466 DIFF_FORMAT_SUMMARY |
4467 DIFF_FORMAT_PATCH);
4468
4469 /*
4470 * These cases always need recursive; we do not drop caller-supplied
4471 * recursive bits for other formats here.
4472 */
4473 if (options->output_format & (DIFF_FORMAT_PATCH |
4474 DIFF_FORMAT_NUMSTAT |
4475 DIFF_FORMAT_DIFFSTAT |
4476 DIFF_FORMAT_SHORTSTAT |
4477 DIFF_FORMAT_DIRSTAT |
4478 DIFF_FORMAT_SUMMARY |
4479 DIFF_FORMAT_CHECKDIFF))
4480 options->flags.recursive = 1;
4481 /*
4482 * Also pickaxe would not work very well if you do not say recursive
4483 */
4484 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4485 options->flags.recursive = 1;
4486 /*
4487 * When patches are generated, submodules diffed against the work tree
4488 * must be checked for dirtiness too so it can be shown in the output
4489 */
4490 if (options->output_format & DIFF_FORMAT_PATCH)
4491 options->flags.dirty_submodules = 1;
4492
4493 if (options->detect_rename && options->rename_limit < 0)
4494 options->rename_limit = diff_rename_limit_default;
4495 if (options->setup & DIFF_SETUP_USE_CACHE) {
4496 if (!active_cache)
4497 /* read-cache does not die even when it fails
4498 * so it is safe for us to do this here. Also
4499 * it does not smudge active_cache or active_nr
4500 * when it fails, so we do not have to worry about
4501 * cleaning it up ourselves either.
4502 */
4503 read_cache();
4504 }
4505 if (hexsz < options->abbrev)
4506 options->abbrev = hexsz; /* full */
4507
4508 /*
4509 * It does not make sense to show the first hit we happened
4510 * to have found. It does not make sense not to return with
4511 * exit code in such a case either.
4512 */
4513 if (options->flags.quick) {
4514 options->output_format = DIFF_FORMAT_NO_OUTPUT;
4515 options->flags.exit_with_status = 1;
4516 }
4517
4518 options->diff_path_counter = 0;
4519
4520 if (options->flags.follow_renames && options->pathspec.nr != 1)
4521 die(_("--follow requires exactly one pathspec"));
4522
4523 if (!options->use_color || external_diff())
4524 options->color_moved = 0;
4525 }
4526
4527 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
4528 {
4529 char c, *eq;
4530 int len;
4531
4532 if (*arg != '-')
4533 return 0;
4534 c = *++arg;
4535 if (!c)
4536 return 0;
4537 if (c == arg_short) {
4538 c = *++arg;
4539 if (!c)
4540 return 1;
4541 if (val && isdigit(c)) {
4542 char *end;
4543 int n = strtoul(arg, &end, 10);
4544 if (*end)
4545 return 0;
4546 *val = n;
4547 return 1;
4548 }
4549 return 0;
4550 }
4551 if (c != '-')
4552 return 0;
4553 arg++;
4554 eq = strchrnul(arg, '=');
4555 len = eq - arg;
4556 if (!len || strncmp(arg, arg_long, len))
4557 return 0;
4558 if (*eq) {
4559 int n;
4560 char *end;
4561 if (!isdigit(*++eq))
4562 return 0;
4563 n = strtoul(eq, &end, 10);
4564 if (*end)
4565 return 0;
4566 *val = n;
4567 }
4568 return 1;
4569 }
4570
4571 static int diff_scoreopt_parse(const char *opt);
4572
4573 static inline int short_opt(char opt, const char **argv,
4574 const char **optarg)
4575 {
4576 const char *arg = argv[0];
4577 if (arg[0] != '-' || arg[1] != opt)
4578 return 0;
4579 if (arg[2] != '\0') {
4580 *optarg = arg + 2;
4581 return 1;
4582 }
4583 if (!argv[1])
4584 die("Option '%c' requires a value", opt);
4585 *optarg = argv[1];
4586 return 2;
4587 }
4588
4589 int parse_long_opt(const char *opt, const char **argv,
4590 const char **optarg)
4591 {
4592 const char *arg = argv[0];
4593 if (!skip_prefix(arg, "--", &arg))
4594 return 0;
4595 if (!skip_prefix(arg, opt, &arg))
4596 return 0;
4597 if (*arg == '=') { /* stuck form: --option=value */
4598 *optarg = arg + 1;
4599 return 1;
4600 }
4601 if (*arg != '\0')
4602 return 0;
4603 /* separate form: --option value */
4604 if (!argv[1])
4605 die("Option '--%s' requires a value", opt);
4606 *optarg = argv[1];
4607 return 2;
4608 }
4609
4610 static int stat_opt(struct diff_options *options, const char **av)
4611 {
4612 const char *arg = av[0];
4613 char *end;
4614 int width = options->stat_width;
4615 int name_width = options->stat_name_width;
4616 int graph_width = options->stat_graph_width;
4617 int count = options->stat_count;
4618 int argcount = 1;
4619
4620 if (!skip_prefix(arg, "--stat", &arg))
4621 BUG("stat option does not begin with --stat: %s", arg);
4622 end = (char *)arg;
4623
4624 switch (*arg) {
4625 case '-':
4626 if (skip_prefix(arg, "-width", &arg)) {
4627 if (*arg == '=')
4628 width = strtoul(arg + 1, &end, 10);
4629 else if (!*arg && !av[1])
4630 die_want_option("--stat-width");
4631 else if (!*arg) {
4632 width = strtoul(av[1], &end, 10);
4633 argcount = 2;
4634 }
4635 } else if (skip_prefix(arg, "-name-width", &arg)) {
4636 if (*arg == '=')
4637 name_width = strtoul(arg + 1, &end, 10);
4638 else if (!*arg && !av[1])
4639 die_want_option("--stat-name-width");
4640 else if (!*arg) {
4641 name_width = strtoul(av[1], &end, 10);
4642 argcount = 2;
4643 }
4644 } else if (skip_prefix(arg, "-graph-width", &arg)) {
4645 if (*arg == '=')
4646 graph_width = strtoul(arg + 1, &end, 10);
4647 else if (!*arg && !av[1])
4648 die_want_option("--stat-graph-width");
4649 else if (!*arg) {
4650 graph_width = strtoul(av[1], &end, 10);
4651 argcount = 2;
4652 }
4653 } else if (skip_prefix(arg, "-count", &arg)) {
4654 if (*arg == '=')
4655 count = strtoul(arg + 1, &end, 10);
4656 else if (!*arg && !av[1])
4657 die_want_option("--stat-count");
4658 else if (!*arg) {
4659 count = strtoul(av[1], &end, 10);
4660 argcount = 2;
4661 }
4662 }
4663 break;
4664 case '=':
4665 width = strtoul(arg+1, &end, 10);
4666 if (*end == ',')
4667 name_width = strtoul(end+1, &end, 10);
4668 if (*end == ',')
4669 count = strtoul(end+1, &end, 10);
4670 }
4671
4672 /* Important! This checks all the error cases! */
4673 if (*end)
4674 return 0;
4675 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4676 options->stat_name_width = name_width;
4677 options->stat_graph_width = graph_width;
4678 options->stat_width = width;
4679 options->stat_count = count;
4680 return argcount;
4681 }
4682
4683 static int parse_dirstat_opt(struct diff_options *options, const char *params)
4684 {
4685 struct strbuf errmsg = STRBUF_INIT;
4686 if (parse_dirstat_params(options, params, &errmsg))
4687 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
4688 errmsg.buf);
4689 strbuf_release(&errmsg);
4690 /*
4691 * The caller knows a dirstat-related option is given from the command
4692 * line; allow it to say "return this_function();"
4693 */
4694 options->output_format |= DIFF_FORMAT_DIRSTAT;
4695 return 1;
4696 }
4697
4698 static int parse_submodule_opt(struct diff_options *options, const char *value)
4699 {
4700 if (parse_submodule_params(options, value))
4701 die(_("Failed to parse --submodule option parameter: '%s'"),
4702 value);
4703 return 1;
4704 }
4705
4706 static const char diff_status_letters[] = {
4707 DIFF_STATUS_ADDED,
4708 DIFF_STATUS_COPIED,
4709 DIFF_STATUS_DELETED,
4710 DIFF_STATUS_MODIFIED,
4711 DIFF_STATUS_RENAMED,
4712 DIFF_STATUS_TYPE_CHANGED,
4713 DIFF_STATUS_UNKNOWN,
4714 DIFF_STATUS_UNMERGED,
4715 DIFF_STATUS_FILTER_AON,
4716 DIFF_STATUS_FILTER_BROKEN,
4717 '\0',
4718 };
4719
4720 static unsigned int filter_bit['Z' + 1];
4721
4722 static void prepare_filter_bits(void)
4723 {
4724 int i;
4725
4726 if (!filter_bit[DIFF_STATUS_ADDED]) {
4727 for (i = 0; diff_status_letters[i]; i++)
4728 filter_bit[(int) diff_status_letters[i]] = (1 << i);
4729 }
4730 }
4731
4732 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
4733 {
4734 return opt->filter & filter_bit[(int) status];
4735 }
4736
4737 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
4738 {
4739 int i, optch;
4740
4741 prepare_filter_bits();
4742
4743 /*
4744 * If there is a negation e.g. 'd' in the input, and we haven't
4745 * initialized the filter field with another --diff-filter, start
4746 * from full set of bits, except for AON.
4747 */
4748 if (!opt->filter) {
4749 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4750 if (optch < 'a' || 'z' < optch)
4751 continue;
4752 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
4753 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
4754 break;
4755 }
4756 }
4757
4758 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
4759 unsigned int bit;
4760 int negate;
4761
4762 if ('a' <= optch && optch <= 'z') {
4763 negate = 1;
4764 optch = toupper(optch);
4765 } else {
4766 negate = 0;
4767 }
4768
4769 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
4770 if (!bit)
4771 return optarg[i];
4772 if (negate)
4773 opt->filter &= ~bit;
4774 else
4775 opt->filter |= bit;
4776 }
4777 return 0;
4778 }
4779
4780 static void enable_patch_output(int *fmt) {
4781 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
4782 *fmt |= DIFF_FORMAT_PATCH;
4783 }
4784
4785 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
4786 {
4787 int val = parse_ws_error_highlight(arg);
4788
4789 if (val < 0) {
4790 error("unknown value after ws-error-highlight=%.*s",
4791 -1 - val, arg);
4792 return 0;
4793 }
4794 opt->ws_error_highlight = val;
4795 return 1;
4796 }
4797
4798 static int parse_objfind_opt(struct diff_options *opt, const char *arg)
4799 {
4800 struct object_id oid;
4801
4802 if (get_oid(arg, &oid))
4803 return error("unable to resolve '%s'", arg);
4804
4805 if (!opt->objfind)
4806 opt->objfind = xcalloc(1, sizeof(*opt->objfind));
4807
4808 opt->pickaxe_opts |= DIFF_PICKAXE_KIND_OBJFIND;
4809 opt->flags.recursive = 1;
4810 opt->flags.tree_in_recursive = 1;
4811 oidset_insert(opt->objfind, &oid);
4812 return 1;
4813 }
4814
4815 int diff_opt_parse(struct diff_options *options,
4816 const char **av, int ac, const char *prefix)
4817 {
4818 const char *arg = av[0];
4819 const char *optarg;
4820 int argcount;
4821
4822 if (!prefix)
4823 prefix = "";
4824
4825 /* Output format options */
4826 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
4827 || opt_arg(arg, 'U', "unified", &options->context))
4828 enable_patch_output(&options->output_format);
4829 else if (!strcmp(arg, "--raw"))
4830 options->output_format |= DIFF_FORMAT_RAW;
4831 else if (!strcmp(arg, "--patch-with-raw")) {
4832 enable_patch_output(&options->output_format);
4833 options->output_format |= DIFF_FORMAT_RAW;
4834 } else if (!strcmp(arg, "--numstat"))
4835 options->output_format |= DIFF_FORMAT_NUMSTAT;
4836 else if (!strcmp(arg, "--shortstat"))
4837 options->output_format |= DIFF_FORMAT_SHORTSTAT;
4838 else if (skip_prefix(arg, "-X", &arg) ||
4839 skip_to_optional_arg(arg, "--dirstat", &arg))
4840 return parse_dirstat_opt(options, arg);
4841 else if (!strcmp(arg, "--cumulative"))
4842 return parse_dirstat_opt(options, "cumulative");
4843 else if (skip_to_optional_arg(arg, "--dirstat-by-file", &arg)) {
4844 parse_dirstat_opt(options, "files");
4845 return parse_dirstat_opt(options, arg);
4846 }
4847 else if (!strcmp(arg, "--check"))
4848 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4849 else if (!strcmp(arg, "--summary"))
4850 options->output_format |= DIFF_FORMAT_SUMMARY;
4851 else if (!strcmp(arg, "--patch-with-stat")) {
4852 enable_patch_output(&options->output_format);
4853 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4854 } else if (!strcmp(arg, "--name-only"))
4855 options->output_format |= DIFF_FORMAT_NAME;
4856 else if (!strcmp(arg, "--name-status"))
4857 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4858 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4859 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4860 else if (starts_with(arg, "--stat"))
4861 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4862 return stat_opt(options, av);
4863 else if (!strcmp(arg, "--compact-summary")) {
4864 options->flags.stat_with_summary = 1;
4865 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4866 } else if (!strcmp(arg, "--no-compact-summary"))
4867 options->flags.stat_with_summary = 0;
4868
4869 /* renames options */
4870 else if (starts_with(arg, "-B") ||
4871 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4872 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4873 return error("invalid argument to -B: %s", arg+2);
4874 }
4875 else if (starts_with(arg, "-M") ||
4876 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4877 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4878 return error("invalid argument to -M: %s", arg+2);
4879 options->detect_rename = DIFF_DETECT_RENAME;
4880 }
4881 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4882 options->irreversible_delete = 1;
4883 }
4884 else if (starts_with(arg, "-C") ||
4885 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4886 if (options->detect_rename == DIFF_DETECT_COPY)
4887 options->flags.find_copies_harder = 1;
4888 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4889 return error("invalid argument to -C: %s", arg+2);
4890 options->detect_rename = DIFF_DETECT_COPY;
4891 }
4892 else if (!strcmp(arg, "--no-renames"))
4893 options->detect_rename = 0;
4894 else if (!strcmp(arg, "--rename-empty"))
4895 options->flags.rename_empty = 1;
4896 else if (!strcmp(arg, "--no-rename-empty"))
4897 options->flags.rename_empty = 0;
4898 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4899 options->flags.relative_name = 1;
4900 if (arg)
4901 options->prefix = arg;
4902 }
4903
4904 /* xdiff options */
4905 else if (!strcmp(arg, "--minimal"))
4906 DIFF_XDL_SET(options, NEED_MINIMAL);
4907 else if (!strcmp(arg, "--no-minimal"))
4908 DIFF_XDL_CLR(options, NEED_MINIMAL);
4909 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4910 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4911 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4912 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4913 else if (!strcmp(arg, "--ignore-space-at-eol"))
4914 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4915 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4916 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4917 else if (!strcmp(arg, "--ignore-blank-lines"))
4918 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4919 else if (!strcmp(arg, "--indent-heuristic"))
4920 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4921 else if (!strcmp(arg, "--no-indent-heuristic"))
4922 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4923 else if (!strcmp(arg, "--patience")) {
4924 int i;
4925 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4926 /*
4927 * Both --patience and --anchored use PATIENCE_DIFF
4928 * internally, so remove any anchors previously
4929 * specified.
4930 */
4931 for (i = 0; i < options->anchors_nr; i++)
4932 free(options->anchors[i]);
4933 options->anchors_nr = 0;
4934 } else if (!strcmp(arg, "--histogram"))
4935 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4936 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4937 long value = parse_algorithm_value(optarg);
4938 if (value < 0)
4939 return error("option diff-algorithm accepts \"myers\", "
4940 "\"minimal\", \"patience\" and \"histogram\"");
4941 /* clear out previous settings */
4942 DIFF_XDL_CLR(options, NEED_MINIMAL);
4943 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4944 options->xdl_opts |= value;
4945 return argcount;
4946 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4947 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4948 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4949 options->anchors_alloc);
4950 options->anchors[options->anchors_nr++] = xstrdup(arg);
4951 }
4952
4953 /* flags options */
4954 else if (!strcmp(arg, "--binary")) {
4955 enable_patch_output(&options->output_format);
4956 options->flags.binary = 1;
4957 }
4958 else if (!strcmp(arg, "--full-index"))
4959 options->flags.full_index = 1;
4960 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4961 options->flags.text = 1;
4962 else if (!strcmp(arg, "-R"))
4963 options->flags.reverse_diff = 1;
4964 else if (!strcmp(arg, "--find-copies-harder"))
4965 options->flags.find_copies_harder = 1;
4966 else if (!strcmp(arg, "--follow"))
4967 options->flags.follow_renames = 1;
4968 else if (!strcmp(arg, "--no-follow")) {
4969 options->flags.follow_renames = 0;
4970 options->flags.default_follow_renames = 0;
4971 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
4972 int value = git_config_colorbool(NULL, arg);
4973 if (value < 0)
4974 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4975 options->use_color = value;
4976 }
4977 else if (!strcmp(arg, "--no-color"))
4978 options->use_color = 0;
4979 else if (!strcmp(arg, "--color-moved")) {
4980 if (diff_color_moved_default)
4981 options->color_moved = diff_color_moved_default;
4982 if (options->color_moved == COLOR_MOVED_NO)
4983 options->color_moved = COLOR_MOVED_DEFAULT;
4984 } else if (!strcmp(arg, "--no-color-moved"))
4985 options->color_moved = COLOR_MOVED_NO;
4986 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4987 int cm = parse_color_moved(arg);
4988 if (cm < 0)
4989 die("bad --color-moved argument: %s", arg);
4990 options->color_moved = cm;
4991 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
4992 options->color_moved_ws_handling = parse_color_moved_ws(arg);
4993 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
4994 options->use_color = 1;
4995 options->word_diff = DIFF_WORDS_COLOR;
4996 }
4997 else if (!strcmp(arg, "--word-diff")) {
4998 if (options->word_diff == DIFF_WORDS_NONE)
4999 options->word_diff = DIFF_WORDS_PLAIN;
5000 }
5001 else if (skip_prefix(arg, "--word-diff=", &arg)) {
5002 if (!strcmp(arg, "plain"))
5003 options->word_diff = DIFF_WORDS_PLAIN;
5004 else if (!strcmp(arg, "color")) {
5005 options->use_color = 1;
5006 options->word_diff = DIFF_WORDS_COLOR;
5007 }
5008 else if (!strcmp(arg, "porcelain"))
5009 options->word_diff = DIFF_WORDS_PORCELAIN;
5010 else if (!strcmp(arg, "none"))
5011 options->word_diff = DIFF_WORDS_NONE;
5012 else
5013 die("bad --word-diff argument: %s", arg);
5014 }
5015 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5016 if (options->word_diff == DIFF_WORDS_NONE)
5017 options->word_diff = DIFF_WORDS_PLAIN;
5018 options->word_regex = optarg;
5019 return argcount;
5020 }
5021 else if (!strcmp(arg, "--exit-code"))
5022 options->flags.exit_with_status = 1;
5023 else if (!strcmp(arg, "--quiet"))
5024 options->flags.quick = 1;
5025 else if (!strcmp(arg, "--ext-diff"))
5026 options->flags.allow_external = 1;
5027 else if (!strcmp(arg, "--no-ext-diff"))
5028 options->flags.allow_external = 0;
5029 else if (!strcmp(arg, "--textconv")) {
5030 options->flags.allow_textconv = 1;
5031 options->flags.textconv_set_via_cmdline = 1;
5032 } else if (!strcmp(arg, "--no-textconv"))
5033 options->flags.allow_textconv = 0;
5034 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5035 options->flags.override_submodule_config = 1;
5036 handle_ignore_submodules_arg(options, arg);
5037 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5038 return parse_submodule_opt(options, arg);
5039 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5040 return parse_ws_error_highlight_opt(options, arg);
5041 else if (!strcmp(arg, "--ita-invisible-in-index"))
5042 options->ita_invisible_in_index = 1;
5043 else if (!strcmp(arg, "--ita-visible-in-index"))
5044 options->ita_invisible_in_index = 0;
5045
5046 /* misc options */
5047 else if (!strcmp(arg, "-z"))
5048 options->line_termination = 0;
5049 else if ((argcount = short_opt('l', av, &optarg))) {
5050 options->rename_limit = strtoul(optarg, NULL, 10);
5051 return argcount;
5052 }
5053 else if ((argcount = short_opt('S', av, &optarg))) {
5054 options->pickaxe = optarg;
5055 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5056 return argcount;
5057 } else if ((argcount = short_opt('G', av, &optarg))) {
5058 options->pickaxe = optarg;
5059 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5060 return argcount;
5061 }
5062 else if (!strcmp(arg, "--pickaxe-all"))
5063 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5064 else if (!strcmp(arg, "--pickaxe-regex"))
5065 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5066 else if ((argcount = short_opt('O', av, &optarg))) {
5067 options->orderfile = prefix_filename(prefix, optarg);
5068 return argcount;
5069 } else if (skip_prefix(arg, "--find-object=", &arg))
5070 return parse_objfind_opt(options, arg);
5071 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5072 int offending = parse_diff_filter_opt(optarg, options);
5073 if (offending)
5074 die("unknown change class '%c' in --diff-filter=%s",
5075 offending, optarg);
5076 return argcount;
5077 }
5078 else if (!strcmp(arg, "--no-abbrev"))
5079 options->abbrev = 0;
5080 else if (!strcmp(arg, "--abbrev"))
5081 options->abbrev = DEFAULT_ABBREV;
5082 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5083 options->abbrev = strtoul(arg, NULL, 10);
5084 if (options->abbrev < MINIMUM_ABBREV)
5085 options->abbrev = MINIMUM_ABBREV;
5086 else if (the_hash_algo->hexsz < options->abbrev)
5087 options->abbrev = the_hash_algo->hexsz;
5088 }
5089 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5090 options->a_prefix = optarg;
5091 return argcount;
5092 }
5093 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5094 options->line_prefix = optarg;
5095 options->line_prefix_length = strlen(options->line_prefix);
5096 graph_setup_line_prefix(options);
5097 return argcount;
5098 }
5099 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5100 options->b_prefix = optarg;
5101 return argcount;
5102 }
5103 else if (!strcmp(arg, "--no-prefix"))
5104 options->a_prefix = options->b_prefix = "";
5105 else if (opt_arg(arg, '\0', "inter-hunk-context",
5106 &options->interhunkcontext))
5107 ;
5108 else if (!strcmp(arg, "-W"))
5109 options->flags.funccontext = 1;
5110 else if (!strcmp(arg, "--function-context"))
5111 options->flags.funccontext = 1;
5112 else if (!strcmp(arg, "--no-function-context"))
5113 options->flags.funccontext = 0;
5114 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5115 char *path = prefix_filename(prefix, optarg);
5116 options->file = xfopen(path, "w");
5117 options->close_file = 1;
5118 if (options->use_color != GIT_COLOR_ALWAYS)
5119 options->use_color = GIT_COLOR_NEVER;
5120 free(path);
5121 return argcount;
5122 } else
5123 return 0;
5124 return 1;
5125 }
5126
5127 int parse_rename_score(const char **cp_p)
5128 {
5129 unsigned long num, scale;
5130 int ch, dot;
5131 const char *cp = *cp_p;
5132
5133 num = 0;
5134 scale = 1;
5135 dot = 0;
5136 for (;;) {
5137 ch = *cp;
5138 if ( !dot && ch == '.' ) {
5139 scale = 1;
5140 dot = 1;
5141 } else if ( ch == '%' ) {
5142 scale = dot ? scale*100 : 100;
5143 cp++; /* % is always at the end */
5144 break;
5145 } else if ( ch >= '0' && ch <= '9' ) {
5146 if ( scale < 100000 ) {
5147 scale *= 10;
5148 num = (num*10) + (ch-'0');
5149 }
5150 } else {
5151 break;
5152 }
5153 cp++;
5154 }
5155 *cp_p = cp;
5156
5157 /* user says num divided by scale and we say internally that
5158 * is MAX_SCORE * num / scale.
5159 */
5160 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5161 }
5162
5163 static int diff_scoreopt_parse(const char *opt)
5164 {
5165 int opt1, opt2, cmd;
5166
5167 if (*opt++ != '-')
5168 return -1;
5169 cmd = *opt++;
5170 if (cmd == '-') {
5171 /* convert the long-form arguments into short-form versions */
5172 if (skip_prefix(opt, "break-rewrites", &opt)) {
5173 if (*opt == 0 || *opt++ == '=')
5174 cmd = 'B';
5175 } else if (skip_prefix(opt, "find-copies", &opt)) {
5176 if (*opt == 0 || *opt++ == '=')
5177 cmd = 'C';
5178 } else if (skip_prefix(opt, "find-renames", &opt)) {
5179 if (*opt == 0 || *opt++ == '=')
5180 cmd = 'M';
5181 }
5182 }
5183 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5184 return -1; /* that is not a -M, -C, or -B option */
5185
5186 opt1 = parse_rename_score(&opt);
5187 if (cmd != 'B')
5188 opt2 = 0;
5189 else {
5190 if (*opt == 0)
5191 opt2 = 0;
5192 else if (*opt != '/')
5193 return -1; /* we expect -B80/99 or -B80 */
5194 else {
5195 opt++;
5196 opt2 = parse_rename_score(&opt);
5197 }
5198 }
5199 if (*opt != 0)
5200 return -1;
5201 return opt1 | (opt2 << 16);
5202 }
5203
5204 struct diff_queue_struct diff_queued_diff;
5205
5206 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5207 {
5208 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5209 queue->queue[queue->nr++] = dp;
5210 }
5211
5212 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5213 struct diff_filespec *one,
5214 struct diff_filespec *two)
5215 {
5216 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5217 dp->one = one;
5218 dp->two = two;
5219 if (queue)
5220 diff_q(queue, dp);
5221 return dp;
5222 }
5223
5224 void diff_free_filepair(struct diff_filepair *p)
5225 {
5226 free_filespec(p->one);
5227 free_filespec(p->two);
5228 free(p);
5229 }
5230
5231 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5232 {
5233 int abblen;
5234 const char *abbrev;
5235
5236 /* Do we want all 40 hex characters? */
5237 if (len == the_hash_algo->hexsz)
5238 return oid_to_hex(oid);
5239
5240 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5241 abbrev = diff_abbrev_oid(oid, len);
5242
5243 if (!print_sha1_ellipsis())
5244 return abbrev;
5245
5246 abblen = strlen(abbrev);
5247
5248 /*
5249 * In well-behaved cases, where the abbreviated result is the
5250 * same as the requested length, append three dots after the
5251 * abbreviation (hence the whole logic is limited to the case
5252 * where abblen < 37); when the actual abbreviated result is a
5253 * bit longer than the requested length, we reduce the number
5254 * of dots so that they match the well-behaved ones. However,
5255 * if the actual abbreviation is longer than the requested
5256 * length by more than three, we give up on aligning, and add
5257 * three dots anyway, to indicate that the output is not the
5258 * full object name. Yes, this may be suboptimal, but this
5259 * appears only in "diff --raw --abbrev" output and it is not
5260 * worth the effort to change it now. Note that this would
5261 * likely to work fine when the automatic sizing of default
5262 * abbreviation length is used--we would be fed -1 in "len" in
5263 * that case, and will end up always appending three-dots, but
5264 * the automatic sizing is supposed to give abblen that ensures
5265 * uniqueness across all objects (statistically speaking).
5266 */
5267 if (abblen < the_hash_algo->hexsz - 3) {
5268 static char hex[GIT_MAX_HEXSZ + 1];
5269 if (len < abblen && abblen <= len + 2)
5270 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5271 else
5272 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5273 return hex;
5274 }
5275
5276 return oid_to_hex(oid);
5277 }
5278
5279 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5280 {
5281 int line_termination = opt->line_termination;
5282 int inter_name_termination = line_termination ? '\t' : '\0';
5283
5284 fprintf(opt->file, "%s", diff_line_prefix(opt));
5285 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5286 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5287 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5288 fprintf(opt->file, "%s ",
5289 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5290 }
5291 if (p->score) {
5292 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5293 inter_name_termination);
5294 } else {
5295 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5296 }
5297
5298 if (p->status == DIFF_STATUS_COPIED ||
5299 p->status == DIFF_STATUS_RENAMED) {
5300 const char *name_a, *name_b;
5301 name_a = p->one->path;
5302 name_b = p->two->path;
5303 strip_prefix(opt->prefix_length, &name_a, &name_b);
5304 write_name_quoted(name_a, opt->file, inter_name_termination);
5305 write_name_quoted(name_b, opt->file, line_termination);
5306 } else {
5307 const char *name_a, *name_b;
5308 name_a = p->one->mode ? p->one->path : p->two->path;
5309 name_b = NULL;
5310 strip_prefix(opt->prefix_length, &name_a, &name_b);
5311 write_name_quoted(name_a, opt->file, line_termination);
5312 }
5313 }
5314
5315 int diff_unmodified_pair(struct diff_filepair *p)
5316 {
5317 /* This function is written stricter than necessary to support
5318 * the currently implemented transformers, but the idea is to
5319 * let transformers to produce diff_filepairs any way they want,
5320 * and filter and clean them up here before producing the output.
5321 */
5322 struct diff_filespec *one = p->one, *two = p->two;
5323
5324 if (DIFF_PAIR_UNMERGED(p))
5325 return 0; /* unmerged is interesting */
5326
5327 /* deletion, addition, mode or type change
5328 * and rename are all interesting.
5329 */
5330 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5331 DIFF_PAIR_MODE_CHANGED(p) ||
5332 strcmp(one->path, two->path))
5333 return 0;
5334
5335 /* both are valid and point at the same path. that is, we are
5336 * dealing with a change.
5337 */
5338 if (one->oid_valid && two->oid_valid &&
5339 !oidcmp(&one->oid, &two->oid) &&
5340 !one->dirty_submodule && !two->dirty_submodule)
5341 return 1; /* no change */
5342 if (!one->oid_valid && !two->oid_valid)
5343 return 1; /* both look at the same file on the filesystem. */
5344 return 0;
5345 }
5346
5347 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5348 {
5349 if (diff_unmodified_pair(p))
5350 return;
5351
5352 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5353 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5354 return; /* no tree diffs in patch format */
5355
5356 run_diff(p, o);
5357 }
5358
5359 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5360 struct diffstat_t *diffstat)
5361 {
5362 if (diff_unmodified_pair(p))
5363 return;
5364
5365 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5366 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5367 return; /* no useful stat for tree diffs */
5368
5369 run_diffstat(p, o, diffstat);
5370 }
5371
5372 static void diff_flush_checkdiff(struct diff_filepair *p,
5373 struct diff_options *o)
5374 {
5375 if (diff_unmodified_pair(p))
5376 return;
5377
5378 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5379 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5380 return; /* nothing to check in tree diffs */
5381
5382 run_checkdiff(p, o);
5383 }
5384
5385 int diff_queue_is_empty(void)
5386 {
5387 struct diff_queue_struct *q = &diff_queued_diff;
5388 int i;
5389 for (i = 0; i < q->nr; i++)
5390 if (!diff_unmodified_pair(q->queue[i]))
5391 return 0;
5392 return 1;
5393 }
5394
5395 #if DIFF_DEBUG
5396 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5397 {
5398 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5399 x, one ? one : "",
5400 s->path,
5401 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5402 s->mode,
5403 s->oid_valid ? oid_to_hex(&s->oid) : "");
5404 fprintf(stderr, "queue[%d] %s size %lu\n",
5405 x, one ? one : "",
5406 s->size);
5407 }
5408
5409 void diff_debug_filepair(const struct diff_filepair *p, int i)
5410 {
5411 diff_debug_filespec(p->one, i, "one");
5412 diff_debug_filespec(p->two, i, "two");
5413 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5414 p->score, p->status ? p->status : '?',
5415 p->one->rename_used, p->broken_pair);
5416 }
5417
5418 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5419 {
5420 int i;
5421 if (msg)
5422 fprintf(stderr, "%s\n", msg);
5423 fprintf(stderr, "q->nr = %d\n", q->nr);
5424 for (i = 0; i < q->nr; i++) {
5425 struct diff_filepair *p = q->queue[i];
5426 diff_debug_filepair(p, i);
5427 }
5428 }
5429 #endif
5430
5431 static void diff_resolve_rename_copy(void)
5432 {
5433 int i;
5434 struct diff_filepair *p;
5435 struct diff_queue_struct *q = &diff_queued_diff;
5436
5437 diff_debug_queue("resolve-rename-copy", q);
5438
5439 for (i = 0; i < q->nr; i++) {
5440 p = q->queue[i];
5441 p->status = 0; /* undecided */
5442 if (DIFF_PAIR_UNMERGED(p))
5443 p->status = DIFF_STATUS_UNMERGED;
5444 else if (!DIFF_FILE_VALID(p->one))
5445 p->status = DIFF_STATUS_ADDED;
5446 else if (!DIFF_FILE_VALID(p->two))
5447 p->status = DIFF_STATUS_DELETED;
5448 else if (DIFF_PAIR_TYPE_CHANGED(p))
5449 p->status = DIFF_STATUS_TYPE_CHANGED;
5450
5451 /* from this point on, we are dealing with a pair
5452 * whose both sides are valid and of the same type, i.e.
5453 * either in-place edit or rename/copy edit.
5454 */
5455 else if (DIFF_PAIR_RENAME(p)) {
5456 /*
5457 * A rename might have re-connected a broken
5458 * pair up, causing the pathnames to be the
5459 * same again. If so, that's not a rename at
5460 * all, just a modification..
5461 *
5462 * Otherwise, see if this source was used for
5463 * multiple renames, in which case we decrement
5464 * the count, and call it a copy.
5465 */
5466 if (!strcmp(p->one->path, p->two->path))
5467 p->status = DIFF_STATUS_MODIFIED;
5468 else if (--p->one->rename_used > 0)
5469 p->status = DIFF_STATUS_COPIED;
5470 else
5471 p->status = DIFF_STATUS_RENAMED;
5472 }
5473 else if (oidcmp(&p->one->oid, &p->two->oid) ||
5474 p->one->mode != p->two->mode ||
5475 p->one->dirty_submodule ||
5476 p->two->dirty_submodule ||
5477 is_null_oid(&p->one->oid))
5478 p->status = DIFF_STATUS_MODIFIED;
5479 else {
5480 /* This is a "no-change" entry and should not
5481 * happen anymore, but prepare for broken callers.
5482 */
5483 error("feeding unmodified %s to diffcore",
5484 p->one->path);
5485 p->status = DIFF_STATUS_UNKNOWN;
5486 }
5487 }
5488 diff_debug_queue("resolve-rename-copy done", q);
5489 }
5490
5491 static int check_pair_status(struct diff_filepair *p)
5492 {
5493 switch (p->status) {
5494 case DIFF_STATUS_UNKNOWN:
5495 return 0;
5496 case 0:
5497 die("internal error in diff-resolve-rename-copy");
5498 default:
5499 return 1;
5500 }
5501 }
5502
5503 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5504 {
5505 int fmt = opt->output_format;
5506
5507 if (fmt & DIFF_FORMAT_CHECKDIFF)
5508 diff_flush_checkdiff(p, opt);
5509 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5510 diff_flush_raw(p, opt);
5511 else if (fmt & DIFF_FORMAT_NAME) {
5512 const char *name_a, *name_b;
5513 name_a = p->two->path;
5514 name_b = NULL;
5515 strip_prefix(opt->prefix_length, &name_a, &name_b);
5516 fprintf(opt->file, "%s", diff_line_prefix(opt));
5517 write_name_quoted(name_a, opt->file, opt->line_termination);
5518 }
5519 }
5520
5521 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5522 {
5523 struct strbuf sb = STRBUF_INIT;
5524 if (fs->mode)
5525 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5526 else
5527 strbuf_addf(&sb, " %s ", newdelete);
5528
5529 quote_c_style(fs->path, &sb, NULL, 0);
5530 strbuf_addch(&sb, '\n');
5531 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5532 sb.buf, sb.len, 0);
5533 strbuf_release(&sb);
5534 }
5535
5536 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5537 int show_name)
5538 {
5539 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5540 struct strbuf sb = STRBUF_INIT;
5541 strbuf_addf(&sb, " mode change %06o => %06o",
5542 p->one->mode, p->two->mode);
5543 if (show_name) {
5544 strbuf_addch(&sb, ' ');
5545 quote_c_style(p->two->path, &sb, NULL, 0);
5546 }
5547 strbuf_addch(&sb, '\n');
5548 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5549 sb.buf, sb.len, 0);
5550 strbuf_release(&sb);
5551 }
5552 }
5553
5554 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5555 struct diff_filepair *p)
5556 {
5557 struct strbuf sb = STRBUF_INIT;
5558 struct strbuf names = STRBUF_INIT;
5559
5560 pprint_rename(&names, p->one->path, p->two->path);
5561 strbuf_addf(&sb, " %s %s (%d%%)\n",
5562 renamecopy, names.buf, similarity_index(p));
5563 strbuf_release(&names);
5564 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5565 sb.buf, sb.len, 0);
5566 show_mode_change(opt, p, 0);
5567 strbuf_release(&sb);
5568 }
5569
5570 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5571 {
5572 switch(p->status) {
5573 case DIFF_STATUS_DELETED:
5574 show_file_mode_name(opt, "delete", p->one);
5575 break;
5576 case DIFF_STATUS_ADDED:
5577 show_file_mode_name(opt, "create", p->two);
5578 break;
5579 case DIFF_STATUS_COPIED:
5580 show_rename_copy(opt, "copy", p);
5581 break;
5582 case DIFF_STATUS_RENAMED:
5583 show_rename_copy(opt, "rename", p);
5584 break;
5585 default:
5586 if (p->score) {
5587 struct strbuf sb = STRBUF_INIT;
5588 strbuf_addstr(&sb, " rewrite ");
5589 quote_c_style(p->two->path, &sb, NULL, 0);
5590 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5591 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5592 sb.buf, sb.len, 0);
5593 strbuf_release(&sb);
5594 }
5595 show_mode_change(opt, p, !p->score);
5596 break;
5597 }
5598 }
5599
5600 struct patch_id_t {
5601 git_SHA_CTX *ctx;
5602 int patchlen;
5603 };
5604
5605 static int remove_space(char *line, int len)
5606 {
5607 int i;
5608 char *dst = line;
5609 unsigned char c;
5610
5611 for (i = 0; i < len; i++)
5612 if (!isspace((c = line[i])))
5613 *dst++ = c;
5614
5615 return dst - line;
5616 }
5617
5618 static void patch_id_consume(void *priv, char *line, unsigned long len)
5619 {
5620 struct patch_id_t *data = priv;
5621 int new_len;
5622
5623 /* Ignore line numbers when computing the SHA1 of the patch */
5624 if (starts_with(line, "@@ -"))
5625 return;
5626
5627 new_len = remove_space(line, len);
5628
5629 git_SHA1_Update(data->ctx, line, new_len);
5630 data->patchlen += new_len;
5631 }
5632
5633 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5634 {
5635 git_SHA1_Update(ctx, str, strlen(str));
5636 }
5637
5638 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5639 {
5640 /* large enough for 2^32 in octal */
5641 char buf[12];
5642 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5643 git_SHA1_Update(ctx, buf, len);
5644 }
5645
5646 /* returns 0 upon success, and writes result into sha1 */
5647 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5648 {
5649 struct diff_queue_struct *q = &diff_queued_diff;
5650 int i;
5651 git_SHA_CTX ctx;
5652 struct patch_id_t data;
5653
5654 git_SHA1_Init(&ctx);
5655 memset(&data, 0, sizeof(struct patch_id_t));
5656 data.ctx = &ctx;
5657
5658 for (i = 0; i < q->nr; i++) {
5659 xpparam_t xpp;
5660 xdemitconf_t xecfg;
5661 mmfile_t mf1, mf2;
5662 struct diff_filepair *p = q->queue[i];
5663 int len1, len2;
5664
5665 memset(&xpp, 0, sizeof(xpp));
5666 memset(&xecfg, 0, sizeof(xecfg));
5667 if (p->status == 0)
5668 return error("internal diff status error");
5669 if (p->status == DIFF_STATUS_UNKNOWN)
5670 continue;
5671 if (diff_unmodified_pair(p))
5672 continue;
5673 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5674 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5675 continue;
5676 if (DIFF_PAIR_UNMERGED(p))
5677 continue;
5678
5679 diff_fill_oid_info(p->one);
5680 diff_fill_oid_info(p->two);
5681
5682 len1 = remove_space(p->one->path, strlen(p->one->path));
5683 len2 = remove_space(p->two->path, strlen(p->two->path));
5684 patch_id_add_string(&ctx, "diff--git");
5685 patch_id_add_string(&ctx, "a/");
5686 git_SHA1_Update(&ctx, p->one->path, len1);
5687 patch_id_add_string(&ctx, "b/");
5688 git_SHA1_Update(&ctx, p->two->path, len2);
5689
5690 if (p->one->mode == 0) {
5691 patch_id_add_string(&ctx, "newfilemode");
5692 patch_id_add_mode(&ctx, p->two->mode);
5693 patch_id_add_string(&ctx, "---/dev/null");
5694 patch_id_add_string(&ctx, "+++b/");
5695 git_SHA1_Update(&ctx, p->two->path, len2);
5696 } else if (p->two->mode == 0) {
5697 patch_id_add_string(&ctx, "deletedfilemode");
5698 patch_id_add_mode(&ctx, p->one->mode);
5699 patch_id_add_string(&ctx, "---a/");
5700 git_SHA1_Update(&ctx, p->one->path, len1);
5701 patch_id_add_string(&ctx, "+++/dev/null");
5702 } else {
5703 patch_id_add_string(&ctx, "---a/");
5704 git_SHA1_Update(&ctx, p->one->path, len1);
5705 patch_id_add_string(&ctx, "+++b/");
5706 git_SHA1_Update(&ctx, p->two->path, len2);
5707 }
5708
5709 if (diff_header_only)
5710 continue;
5711
5712 if (fill_mmfile(&mf1, p->one) < 0 ||
5713 fill_mmfile(&mf2, p->two) < 0)
5714 return error("unable to read files to diff");
5715
5716 if (diff_filespec_is_binary(p->one) ||
5717 diff_filespec_is_binary(p->two)) {
5718 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5719 GIT_SHA1_HEXSZ);
5720 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5721 GIT_SHA1_HEXSZ);
5722 continue;
5723 }
5724
5725 xpp.flags = 0;
5726 xecfg.ctxlen = 3;
5727 xecfg.flags = 0;
5728 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5729 &xpp, &xecfg))
5730 return error("unable to generate patch-id diff for %s",
5731 p->one->path);
5732 }
5733
5734 git_SHA1_Final(oid->hash, &ctx);
5735 return 0;
5736 }
5737
5738 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5739 {
5740 struct diff_queue_struct *q = &diff_queued_diff;
5741 int i;
5742 int result = diff_get_patch_id(options, oid, diff_header_only);
5743
5744 for (i = 0; i < q->nr; i++)
5745 diff_free_filepair(q->queue[i]);
5746
5747 free(q->queue);
5748 DIFF_QUEUE_CLEAR(q);
5749
5750 return result;
5751 }
5752
5753 static int is_summary_empty(const struct diff_queue_struct *q)
5754 {
5755 int i;
5756
5757 for (i = 0; i < q->nr; i++) {
5758 const struct diff_filepair *p = q->queue[i];
5759
5760 switch (p->status) {
5761 case DIFF_STATUS_DELETED:
5762 case DIFF_STATUS_ADDED:
5763 case DIFF_STATUS_COPIED:
5764 case DIFF_STATUS_RENAMED:
5765 return 0;
5766 default:
5767 if (p->score)
5768 return 0;
5769 if (p->one->mode && p->two->mode &&
5770 p->one->mode != p->two->mode)
5771 return 0;
5772 break;
5773 }
5774 }
5775 return 1;
5776 }
5777
5778 static const char rename_limit_warning[] =
5779 N_("inexact rename detection was skipped due to too many files.");
5780
5781 static const char degrade_cc_to_c_warning[] =
5782 N_("only found copies from modified paths due to too many files.");
5783
5784 static const char rename_limit_advice[] =
5785 N_("you may want to set your %s variable to at least "
5786 "%d and retry the command.");
5787
5788 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5789 {
5790 fflush(stdout);
5791 if (degraded_cc)
5792 warning(_(degrade_cc_to_c_warning));
5793 else if (needed)
5794 warning(_(rename_limit_warning));
5795 else
5796 return;
5797 if (0 < needed)
5798 warning(_(rename_limit_advice), varname, needed);
5799 }
5800
5801 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5802 {
5803 int i;
5804 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5805 struct diff_queue_struct *q = &diff_queued_diff;
5806
5807 if (WSEH_NEW & WS_RULE_MASK)
5808 BUG("WS rules bit mask overlaps with diff symbol flags");
5809
5810 if (o->color_moved)
5811 o->emitted_symbols = &esm;
5812
5813 for (i = 0; i < q->nr; i++) {
5814 struct diff_filepair *p = q->queue[i];
5815 if (check_pair_status(p))
5816 diff_flush_patch(p, o);
5817 }
5818
5819 if (o->emitted_symbols) {
5820 if (o->color_moved) {
5821 struct hashmap add_lines, del_lines;
5822
5823 if (o->color_moved_ws_handling &
5824 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5825 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5826
5827 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5828 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5829
5830 add_lines_to_move_detection(o, &add_lines, &del_lines);
5831 mark_color_as_moved(o, &add_lines, &del_lines);
5832 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5833 dim_moved_lines(o);
5834
5835 hashmap_free(&add_lines, 0);
5836 hashmap_free(&del_lines, 0);
5837 }
5838
5839 for (i = 0; i < esm.nr; i++)
5840 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5841
5842 for (i = 0; i < esm.nr; i++)
5843 free((void *)esm.buf[i].line);
5844 }
5845 esm.nr = 0;
5846 }
5847
5848 void diff_flush(struct diff_options *options)
5849 {
5850 struct diff_queue_struct *q = &diff_queued_diff;
5851 int i, output_format = options->output_format;
5852 int separator = 0;
5853 int dirstat_by_line = 0;
5854
5855 /*
5856 * Order: raw, stat, summary, patch
5857 * or: name/name-status/checkdiff (other bits clear)
5858 */
5859 if (!q->nr)
5860 goto free_queue;
5861
5862 if (output_format & (DIFF_FORMAT_RAW |
5863 DIFF_FORMAT_NAME |
5864 DIFF_FORMAT_NAME_STATUS |
5865 DIFF_FORMAT_CHECKDIFF)) {
5866 for (i = 0; i < q->nr; i++) {
5867 struct diff_filepair *p = q->queue[i];
5868 if (check_pair_status(p))
5869 flush_one_pair(p, options);
5870 }
5871 separator++;
5872 }
5873
5874 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5875 dirstat_by_line = 1;
5876
5877 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5878 dirstat_by_line) {
5879 struct diffstat_t diffstat;
5880
5881 memset(&diffstat, 0, sizeof(struct diffstat_t));
5882 for (i = 0; i < q->nr; i++) {
5883 struct diff_filepair *p = q->queue[i];
5884 if (check_pair_status(p))
5885 diff_flush_stat(p, options, &diffstat);
5886 }
5887 if (output_format & DIFF_FORMAT_NUMSTAT)
5888 show_numstat(&diffstat, options);
5889 if (output_format & DIFF_FORMAT_DIFFSTAT)
5890 show_stats(&diffstat, options);
5891 if (output_format & DIFF_FORMAT_SHORTSTAT)
5892 show_shortstats(&diffstat, options);
5893 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5894 show_dirstat_by_line(&diffstat, options);
5895 free_diffstat_info(&diffstat);
5896 separator++;
5897 }
5898 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5899 show_dirstat(options);
5900
5901 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5902 for (i = 0; i < q->nr; i++) {
5903 diff_summary(options, q->queue[i]);
5904 }
5905 separator++;
5906 }
5907
5908 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5909 options->flags.exit_with_status &&
5910 options->flags.diff_from_contents) {
5911 /*
5912 * run diff_flush_patch for the exit status. setting
5913 * options->file to /dev/null should be safe, because we
5914 * aren't supposed to produce any output anyway.
5915 */
5916 if (options->close_file)
5917 fclose(options->file);
5918 options->file = xfopen("/dev/null", "w");
5919 options->close_file = 1;
5920 options->color_moved = 0;
5921 for (i = 0; i < q->nr; i++) {
5922 struct diff_filepair *p = q->queue[i];
5923 if (check_pair_status(p))
5924 diff_flush_patch(p, options);
5925 if (options->found_changes)
5926 break;
5927 }
5928 }
5929
5930 if (output_format & DIFF_FORMAT_PATCH) {
5931 if (separator) {
5932 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5933 if (options->stat_sep)
5934 /* attach patch instead of inline */
5935 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5936 NULL, 0, 0);
5937 }
5938
5939 diff_flush_patch_all_file_pairs(options);
5940 }
5941
5942 if (output_format & DIFF_FORMAT_CALLBACK)
5943 options->format_callback(q, options, options->format_callback_data);
5944
5945 for (i = 0; i < q->nr; i++)
5946 diff_free_filepair(q->queue[i]);
5947 free_queue:
5948 free(q->queue);
5949 DIFF_QUEUE_CLEAR(q);
5950 if (options->close_file)
5951 fclose(options->file);
5952
5953 /*
5954 * Report the content-level differences with HAS_CHANGES;
5955 * diff_addremove/diff_change does not set the bit when
5956 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5957 */
5958 if (options->flags.diff_from_contents) {
5959 if (options->found_changes)
5960 options->flags.has_changes = 1;
5961 else
5962 options->flags.has_changes = 0;
5963 }
5964 }
5965
5966 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5967 {
5968 return (((p->status == DIFF_STATUS_MODIFIED) &&
5969 ((p->score &&
5970 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5971 (!p->score &&
5972 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5973 ((p->status != DIFF_STATUS_MODIFIED) &&
5974 filter_bit_tst(p->status, options)));
5975 }
5976
5977 static void diffcore_apply_filter(struct diff_options *options)
5978 {
5979 int i;
5980 struct diff_queue_struct *q = &diff_queued_diff;
5981 struct diff_queue_struct outq;
5982
5983 DIFF_QUEUE_CLEAR(&outq);
5984
5985 if (!options->filter)
5986 return;
5987
5988 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5989 int found;
5990 for (i = found = 0; !found && i < q->nr; i++) {
5991 if (match_filter(options, q->queue[i]))
5992 found++;
5993 }
5994 if (found)
5995 return;
5996
5997 /* otherwise we will clear the whole queue
5998 * by copying the empty outq at the end of this
5999 * function, but first clear the current entries
6000 * in the queue.
6001 */
6002 for (i = 0; i < q->nr; i++)
6003 diff_free_filepair(q->queue[i]);
6004 }
6005 else {
6006 /* Only the matching ones */
6007 for (i = 0; i < q->nr; i++) {
6008 struct diff_filepair *p = q->queue[i];
6009 if (match_filter(options, p))
6010 diff_q(&outq, p);
6011 else
6012 diff_free_filepair(p);
6013 }
6014 }
6015 free(q->queue);
6016 *q = outq;
6017 }
6018
6019 /* Check whether two filespecs with the same mode and size are identical */
6020 static int diff_filespec_is_identical(struct diff_filespec *one,
6021 struct diff_filespec *two)
6022 {
6023 if (S_ISGITLINK(one->mode))
6024 return 0;
6025 if (diff_populate_filespec(one, 0))
6026 return 0;
6027 if (diff_populate_filespec(two, 0))
6028 return 0;
6029 return !memcmp(one->data, two->data, one->size);
6030 }
6031
6032 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
6033 {
6034 if (p->done_skip_stat_unmatch)
6035 return p->skip_stat_unmatch_result;
6036
6037 p->done_skip_stat_unmatch = 1;
6038 p->skip_stat_unmatch_result = 0;
6039 /*
6040 * 1. Entries that come from stat info dirtiness
6041 * always have both sides (iow, not create/delete),
6042 * one side of the object name is unknown, with
6043 * the same mode and size. Keep the ones that
6044 * do not match these criteria. They have real
6045 * differences.
6046 *
6047 * 2. At this point, the file is known to be modified,
6048 * with the same mode and size, and the object
6049 * name of one side is unknown. Need to inspect
6050 * the identical contents.
6051 */
6052 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6053 !DIFF_FILE_VALID(p->two) ||
6054 (p->one->oid_valid && p->two->oid_valid) ||
6055 (p->one->mode != p->two->mode) ||
6056 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
6057 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
6058 (p->one->size != p->two->size) ||
6059 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
6060 p->skip_stat_unmatch_result = 1;
6061 return p->skip_stat_unmatch_result;
6062 }
6063
6064 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6065 {
6066 int i;
6067 struct diff_queue_struct *q = &diff_queued_diff;
6068 struct diff_queue_struct outq;
6069 DIFF_QUEUE_CLEAR(&outq);
6070
6071 for (i = 0; i < q->nr; i++) {
6072 struct diff_filepair *p = q->queue[i];
6073
6074 if (diff_filespec_check_stat_unmatch(p))
6075 diff_q(&outq, p);
6076 else {
6077 /*
6078 * The caller can subtract 1 from skip_stat_unmatch
6079 * to determine how many paths were dirty only
6080 * due to stat info mismatch.
6081 */
6082 if (!diffopt->flags.no_index)
6083 diffopt->skip_stat_unmatch++;
6084 diff_free_filepair(p);
6085 }
6086 }
6087 free(q->queue);
6088 *q = outq;
6089 }
6090
6091 static int diffnamecmp(const void *a_, const void *b_)
6092 {
6093 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6094 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6095 const char *name_a, *name_b;
6096
6097 name_a = a->one ? a->one->path : a->two->path;
6098 name_b = b->one ? b->one->path : b->two->path;
6099 return strcmp(name_a, name_b);
6100 }
6101
6102 void diffcore_fix_diff_index(struct diff_options *options)
6103 {
6104 struct diff_queue_struct *q = &diff_queued_diff;
6105 QSORT(q->queue, q->nr, diffnamecmp);
6106 }
6107
6108 void diffcore_std(struct diff_options *options)
6109 {
6110 /* NOTE please keep the following in sync with diff_tree_combined() */
6111 if (options->skip_stat_unmatch)
6112 diffcore_skip_stat_unmatch(options);
6113 if (!options->found_follow) {
6114 /* See try_to_follow_renames() in tree-diff.c */
6115 if (options->break_opt != -1)
6116 diffcore_break(options->break_opt);
6117 if (options->detect_rename)
6118 diffcore_rename(options);
6119 if (options->break_opt != -1)
6120 diffcore_merge_broken();
6121 }
6122 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6123 diffcore_pickaxe(options);
6124 if (options->orderfile)
6125 diffcore_order(options->orderfile);
6126 if (!options->found_follow)
6127 /* See try_to_follow_renames() in tree-diff.c */
6128 diff_resolve_rename_copy();
6129 diffcore_apply_filter(options);
6130
6131 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6132 options->flags.has_changes = 1;
6133 else
6134 options->flags.has_changes = 0;
6135
6136 options->found_follow = 0;
6137 }
6138
6139 int diff_result_code(struct diff_options *opt, int status)
6140 {
6141 int result = 0;
6142
6143 diff_warn_rename_limit("diff.renameLimit",
6144 opt->needed_rename_limit,
6145 opt->degraded_cc_to_c);
6146 if (!opt->flags.exit_with_status &&
6147 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6148 return status;
6149 if (opt->flags.exit_with_status &&
6150 opt->flags.has_changes)
6151 result |= 01;
6152 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6153 opt->flags.check_failed)
6154 result |= 02;
6155 return result;
6156 }
6157
6158 int diff_can_quit_early(struct diff_options *opt)
6159 {
6160 return (opt->flags.quick &&
6161 !opt->filter &&
6162 opt->flags.has_changes);
6163 }
6164
6165 /*
6166 * Shall changes to this submodule be ignored?
6167 *
6168 * Submodule changes can be configured to be ignored separately for each path,
6169 * but that configuration can be overridden from the command line.
6170 */
6171 static int is_submodule_ignored(const char *path, struct diff_options *options)
6172 {
6173 int ignored = 0;
6174 struct diff_flags orig_flags = options->flags;
6175 if (!options->flags.override_submodule_config)
6176 set_diffopt_flags_from_submodule_config(options, path);
6177 if (options->flags.ignore_submodules)
6178 ignored = 1;
6179 options->flags = orig_flags;
6180 return ignored;
6181 }
6182
6183 void diff_addremove(struct diff_options *options,
6184 int addremove, unsigned mode,
6185 const struct object_id *oid,
6186 int oid_valid,
6187 const char *concatpath, unsigned dirty_submodule)
6188 {
6189 struct diff_filespec *one, *two;
6190
6191 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6192 return;
6193
6194 /* This may look odd, but it is a preparation for
6195 * feeding "there are unchanged files which should
6196 * not produce diffs, but when you are doing copy
6197 * detection you would need them, so here they are"
6198 * entries to the diff-core. They will be prefixed
6199 * with something like '=' or '*' (I haven't decided
6200 * which but should not make any difference).
6201 * Feeding the same new and old to diff_change()
6202 * also has the same effect.
6203 * Before the final output happens, they are pruned after
6204 * merged into rename/copy pairs as appropriate.
6205 */
6206 if (options->flags.reverse_diff)
6207 addremove = (addremove == '+' ? '-' :
6208 addremove == '-' ? '+' : addremove);
6209
6210 if (options->prefix &&
6211 strncmp(concatpath, options->prefix, options->prefix_length))
6212 return;
6213
6214 one = alloc_filespec(concatpath);
6215 two = alloc_filespec(concatpath);
6216
6217 if (addremove != '+')
6218 fill_filespec(one, oid, oid_valid, mode);
6219 if (addremove != '-') {
6220 fill_filespec(two, oid, oid_valid, mode);
6221 two->dirty_submodule = dirty_submodule;
6222 }
6223
6224 diff_queue(&diff_queued_diff, one, two);
6225 if (!options->flags.diff_from_contents)
6226 options->flags.has_changes = 1;
6227 }
6228
6229 void diff_change(struct diff_options *options,
6230 unsigned old_mode, unsigned new_mode,
6231 const struct object_id *old_oid,
6232 const struct object_id *new_oid,
6233 int old_oid_valid, int new_oid_valid,
6234 const char *concatpath,
6235 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6236 {
6237 struct diff_filespec *one, *two;
6238 struct diff_filepair *p;
6239
6240 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6241 is_submodule_ignored(concatpath, options))
6242 return;
6243
6244 if (options->flags.reverse_diff) {
6245 SWAP(old_mode, new_mode);
6246 SWAP(old_oid, new_oid);
6247 SWAP(old_oid_valid, new_oid_valid);
6248 SWAP(old_dirty_submodule, new_dirty_submodule);
6249 }
6250
6251 if (options->prefix &&
6252 strncmp(concatpath, options->prefix, options->prefix_length))
6253 return;
6254
6255 one = alloc_filespec(concatpath);
6256 two = alloc_filespec(concatpath);
6257 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6258 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6259 one->dirty_submodule = old_dirty_submodule;
6260 two->dirty_submodule = new_dirty_submodule;
6261 p = diff_queue(&diff_queued_diff, one, two);
6262
6263 if (options->flags.diff_from_contents)
6264 return;
6265
6266 if (options->flags.quick && options->skip_stat_unmatch &&
6267 !diff_filespec_check_stat_unmatch(p))
6268 return;
6269
6270 options->flags.has_changes = 1;
6271 }
6272
6273 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6274 {
6275 struct diff_filepair *pair;
6276 struct diff_filespec *one, *two;
6277
6278 if (options->prefix &&
6279 strncmp(path, options->prefix, options->prefix_length))
6280 return NULL;
6281
6282 one = alloc_filespec(path);
6283 two = alloc_filespec(path);
6284 pair = diff_queue(&diff_queued_diff, one, two);
6285 pair->is_unmerged = 1;
6286 return pair;
6287 }
6288
6289 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
6290 size_t *outsize)
6291 {
6292 struct diff_tempfile *temp;
6293 const char *argv[3];
6294 const char **arg = argv;
6295 struct child_process child = CHILD_PROCESS_INIT;
6296 struct strbuf buf = STRBUF_INIT;
6297 int err = 0;
6298
6299 temp = prepare_temp_file(spec->path, spec);
6300 *arg++ = pgm;
6301 *arg++ = temp->name;
6302 *arg = NULL;
6303
6304 child.use_shell = 1;
6305 child.argv = argv;
6306 child.out = -1;
6307 if (start_command(&child)) {
6308 remove_tempfile();
6309 return NULL;
6310 }
6311
6312 if (strbuf_read(&buf, child.out, 0) < 0)
6313 err = error("error reading from textconv command '%s'", pgm);
6314 close(child.out);
6315
6316 if (finish_command(&child) || err) {
6317 strbuf_release(&buf);
6318 remove_tempfile();
6319 return NULL;
6320 }
6321 remove_tempfile();
6322
6323 return strbuf_detach(&buf, outsize);
6324 }
6325
6326 size_t fill_textconv(struct userdiff_driver *driver,
6327 struct diff_filespec *df,
6328 char **outbuf)
6329 {
6330 size_t size;
6331
6332 if (!driver) {
6333 if (!DIFF_FILE_VALID(df)) {
6334 *outbuf = "";
6335 return 0;
6336 }
6337 if (diff_populate_filespec(df, 0))
6338 die("unable to read files to diff");
6339 *outbuf = df->data;
6340 return df->size;
6341 }
6342
6343 if (!driver->textconv)
6344 BUG("fill_textconv called with non-textconv driver");
6345
6346 if (driver->textconv_cache && df->oid_valid) {
6347 *outbuf = notes_cache_get(driver->textconv_cache,
6348 &df->oid,
6349 &size);
6350 if (*outbuf)
6351 return size;
6352 }
6353
6354 *outbuf = run_textconv(driver->textconv, df, &size);
6355 if (!*outbuf)
6356 die("unable to read files to diff");
6357
6358 if (driver->textconv_cache && df->oid_valid) {
6359 /* ignore errors, as we might be in a readonly repository */
6360 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6361 size);
6362 /*
6363 * we could save up changes and flush them all at the end,
6364 * but we would need an extra call after all diffing is done.
6365 * Since generating a cache entry is the slow path anyway,
6366 * this extra overhead probably isn't a big deal.
6367 */
6368 notes_cache_write(driver->textconv_cache);
6369 }
6370
6371 return size;
6372 }
6373
6374 int textconv_object(const char *path,
6375 unsigned mode,
6376 const struct object_id *oid,
6377 int oid_valid,
6378 char **buf,
6379 unsigned long *buf_size)
6380 {
6381 struct diff_filespec *df;
6382 struct userdiff_driver *textconv;
6383
6384 df = alloc_filespec(path);
6385 fill_filespec(df, oid, oid_valid, mode);
6386 textconv = get_textconv(df);
6387 if (!textconv) {
6388 free_filespec(df);
6389 return 0;
6390 }
6391
6392 *buf_size = fill_textconv(textconv, df, buf);
6393 free_filespec(df);
6394 return 1;
6395 }
6396
6397 void setup_diff_pager(struct diff_options *opt)
6398 {
6399 /*
6400 * If the user asked for our exit code, then either they want --quiet
6401 * or --exit-code. We should definitely not bother with a pager in the
6402 * former case, as we will generate no output. Since we still properly
6403 * report our exit code even when a pager is run, we _could_ run a
6404 * pager with --exit-code. But since we have not done so historically,
6405 * and because it is easy to find people oneline advising "git diff
6406 * --exit-code" in hooks and other scripts, we do not do so.
6407 */
6408 if (!opt->flags.exit_with_status &&
6409 check_pager_config("diff") != 0)
6410 setup_pager();
6411 }
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