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Initial batch post 2.19
[alt-git.git] / diff.c
blob71ff247702048f70dbfaec59090132461c70642d
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "config.h"
6 #include "tempfile.h"
7 #include "quote.h"
8 #include "diff.h"
9 #include "diffcore.h"
10 #include "delta.h"
11 #include "xdiff-interface.h"
12 #include "color.h"
13 #include "attr.h"
14 #include "run-command.h"
15 #include "utf8.h"
16 #include "object-store.h"
17 #include "userdiff.h"
18 #include "submodule-config.h"
19 #include "submodule.h"
20 #include "hashmap.h"
21 #include "ll-merge.h"
22 #include "string-list.h"
23 #include "argv-array.h"
24 #include "graph.h"
25 #include "packfile.h"
26 #include "help.h"
27
28 #ifdef NO_FAST_WORKING_DIRECTORY
29 #define FAST_WORKING_DIRECTORY 0
30 #else
31 #define FAST_WORKING_DIRECTORY 1
32 #endif
33
34 static int diff_detect_rename_default;
35 static int diff_indent_heuristic = 1;
36 static int diff_rename_limit_default = 400;
37 static int diff_suppress_blank_empty;
38 static int diff_use_color_default = -1;
39 static int diff_color_moved_default;
40 static int diff_color_moved_ws_default;
41 static int diff_context_default = 3;
42 static int diff_interhunk_context_default;
43 static const char *diff_word_regex_cfg;
44 static const char *external_diff_cmd_cfg;
45 static const char *diff_order_file_cfg;
46 int diff_auto_refresh_index = 1;
47 static int diff_mnemonic_prefix;
48 static int diff_no_prefix;
49 static int diff_stat_graph_width;
50 static int diff_dirstat_permille_default = 30;
51 static struct diff_options default_diff_options;
52 static long diff_algorithm;
53 static unsigned ws_error_highlight_default = WSEH_NEW;
54
55 static char diff_colors[][COLOR_MAXLEN] = {
56 GIT_COLOR_RESET,
57 GIT_COLOR_NORMAL, /* CONTEXT */
58 GIT_COLOR_BOLD, /* METAINFO */
59 GIT_COLOR_CYAN, /* FRAGINFO */
60 GIT_COLOR_RED, /* OLD */
61 GIT_COLOR_GREEN, /* NEW */
62 GIT_COLOR_YELLOW, /* COMMIT */
63 GIT_COLOR_BG_RED, /* WHITESPACE */
64 GIT_COLOR_NORMAL, /* FUNCINFO */
65 GIT_COLOR_BOLD_MAGENTA, /* OLD_MOVED */
66 GIT_COLOR_BOLD_BLUE, /* OLD_MOVED ALTERNATIVE */
67 GIT_COLOR_FAINT, /* OLD_MOVED_DIM */
68 GIT_COLOR_FAINT_ITALIC, /* OLD_MOVED_ALTERNATIVE_DIM */
69 GIT_COLOR_BOLD_CYAN, /* NEW_MOVED */
70 GIT_COLOR_BOLD_YELLOW, /* NEW_MOVED ALTERNATIVE */
71 GIT_COLOR_FAINT, /* NEW_MOVED_DIM */
72 GIT_COLOR_FAINT_ITALIC, /* NEW_MOVED_ALTERNATIVE_DIM */
73 GIT_COLOR_FAINT, /* CONTEXT_DIM */
74 GIT_COLOR_FAINT_RED, /* OLD_DIM */
75 GIT_COLOR_FAINT_GREEN, /* NEW_DIM */
76 GIT_COLOR_BOLD, /* CONTEXT_BOLD */
77 GIT_COLOR_BOLD_RED, /* OLD_BOLD */
78 GIT_COLOR_BOLD_GREEN, /* NEW_BOLD */
79 };
80
81 static const char *color_diff_slots[] = {
82 [DIFF_CONTEXT] = "context",
83 [DIFF_METAINFO] = "meta",
84 [DIFF_FRAGINFO] = "frag",
85 [DIFF_FILE_OLD] = "old",
86 [DIFF_FILE_NEW] = "new",
87 [DIFF_COMMIT] = "commit",
88 [DIFF_WHITESPACE] = "whitespace",
89 [DIFF_FUNCINFO] = "func",
90 [DIFF_FILE_OLD_MOVED] = "oldMoved",
91 [DIFF_FILE_OLD_MOVED_ALT] = "oldMovedAlternative",
92 [DIFF_FILE_OLD_MOVED_DIM] = "oldMovedDimmed",
93 [DIFF_FILE_OLD_MOVED_ALT_DIM] = "oldMovedAlternativeDimmed",
94 [DIFF_FILE_NEW_MOVED] = "newMoved",
95 [DIFF_FILE_NEW_MOVED_ALT] = "newMovedAlternative",
96 [DIFF_FILE_NEW_MOVED_DIM] = "newMovedDimmed",
97 [DIFF_FILE_NEW_MOVED_ALT_DIM] = "newMovedAlternativeDimmed",
98 [DIFF_CONTEXT_DIM] = "contextDimmed",
99 [DIFF_FILE_OLD_DIM] = "oldDimmed",
100 [DIFF_FILE_NEW_DIM] = "newDimmed",
101 [DIFF_CONTEXT_BOLD] = "contextBold",
102 [DIFF_FILE_OLD_BOLD] = "oldBold",
103 [DIFF_FILE_NEW_BOLD] = "newBold",
104 };
105
106 static NORETURN void die_want_option(const char *option_name)
107 {
108 die(_("option '%s' requires a value"), option_name);
109 }
110
111 define_list_config_array_extra(color_diff_slots, {"plain"});
112
113 static int parse_diff_color_slot(const char *var)
114 {
115 if (!strcasecmp(var, "plain"))
116 return DIFF_CONTEXT;
117 return LOOKUP_CONFIG(color_diff_slots, var);
118 }
119
120 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
121 struct strbuf *errmsg)
122 {
123 char *params_copy = xstrdup(params_string);
124 struct string_list params = STRING_LIST_INIT_NODUP;
125 int ret = 0;
126 int i;
127
128 if (*params_copy)
129 string_list_split_in_place(&params, params_copy, ',', -1);
130 for (i = 0; i < params.nr; i++) {
131 const char *p = params.items[i].string;
132 if (!strcmp(p, "changes")) {
133 options->flags.dirstat_by_line = 0;
134 options->flags.dirstat_by_file = 0;
135 } else if (!strcmp(p, "lines")) {
136 options->flags.dirstat_by_line = 1;
137 options->flags.dirstat_by_file = 0;
138 } else if (!strcmp(p, "files")) {
139 options->flags.dirstat_by_line = 0;
140 options->flags.dirstat_by_file = 1;
141 } else if (!strcmp(p, "noncumulative")) {
142 options->flags.dirstat_cumulative = 0;
143 } else if (!strcmp(p, "cumulative")) {
144 options->flags.dirstat_cumulative = 1;
145 } else if (isdigit(*p)) {
146 char *end;
147 int permille = strtoul(p, &end, 10) * 10;
148 if (*end == '.' && isdigit(*++end)) {
149 /* only use first digit */
150 permille += *end - '0';
151 /* .. and ignore any further digits */
152 while (isdigit(*++end))
153 ; /* nothing */
154 }
155 if (!*end)
156 options->dirstat_permille = permille;
157 else {
158 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
159 p);
160 ret++;
161 }
162 } else {
163 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
164 ret++;
165 }
166
167 }
168 string_list_clear(&params, 0);
169 free(params_copy);
170 return ret;
171 }
172
173 static int parse_submodule_params(struct diff_options *options, const char *value)
174 {
175 if (!strcmp(value, "log"))
176 options->submodule_format = DIFF_SUBMODULE_LOG;
177 else if (!strcmp(value, "short"))
178 options->submodule_format = DIFF_SUBMODULE_SHORT;
179 else if (!strcmp(value, "diff"))
180 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
181 else
182 return -1;
183 return 0;
184 }
185
186 int git_config_rename(const char *var, const char *value)
187 {
188 if (!value)
189 return DIFF_DETECT_RENAME;
190 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
191 return DIFF_DETECT_COPY;
192 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
193 }
194
195 long parse_algorithm_value(const char *value)
196 {
197 if (!value)
198 return -1;
199 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
200 return 0;
201 else if (!strcasecmp(value, "minimal"))
202 return XDF_NEED_MINIMAL;
203 else if (!strcasecmp(value, "patience"))
204 return XDF_PATIENCE_DIFF;
205 else if (!strcasecmp(value, "histogram"))
206 return XDF_HISTOGRAM_DIFF;
207 return -1;
208 }
209
210 static int parse_one_token(const char **arg, const char *token)
211 {
212 const char *rest;
213 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
214 *arg = rest;
215 return 1;
216 }
217 return 0;
218 }
219
220 static int parse_ws_error_highlight(const char *arg)
221 {
222 const char *orig_arg = arg;
223 unsigned val = 0;
224
225 while (*arg) {
226 if (parse_one_token(&arg, "none"))
227 val = 0;
228 else if (parse_one_token(&arg, "default"))
229 val = WSEH_NEW;
230 else if (parse_one_token(&arg, "all"))
231 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
232 else if (parse_one_token(&arg, "new"))
233 val |= WSEH_NEW;
234 else if (parse_one_token(&arg, "old"))
235 val |= WSEH_OLD;
236 else if (parse_one_token(&arg, "context"))
237 val |= WSEH_CONTEXT;
238 else {
239 return -1 - (int)(arg - orig_arg);
240 }
241 if (*arg)
242 arg++;
243 }
244 return val;
245 }
246
247 /*
248 * These are to give UI layer defaults.
249 * The core-level commands such as git-diff-files should
250 * never be affected by the setting of diff.renames
251 * the user happens to have in the configuration file.
252 */
253 void init_diff_ui_defaults(void)
254 {
255 diff_detect_rename_default = DIFF_DETECT_RENAME;
256 }
257
258 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
259 {
260 if (!strcmp(var, "diff.indentheuristic"))
261 diff_indent_heuristic = git_config_bool(var, value);
262 return 0;
263 }
264
265 static int parse_color_moved(const char *arg)
266 {
267 switch (git_parse_maybe_bool(arg)) {
268 case 0:
269 return COLOR_MOVED_NO;
270 case 1:
271 return COLOR_MOVED_DEFAULT;
272 default:
273 break;
274 }
275
276 if (!strcmp(arg, "no"))
277 return COLOR_MOVED_NO;
278 else if (!strcmp(arg, "plain"))
279 return COLOR_MOVED_PLAIN;
280 else if (!strcmp(arg, "blocks"))
281 return COLOR_MOVED_BLOCKS;
282 else if (!strcmp(arg, "zebra"))
283 return COLOR_MOVED_ZEBRA;
284 else if (!strcmp(arg, "default"))
285 return COLOR_MOVED_DEFAULT;
286 else if (!strcmp(arg, "dimmed-zebra"))
287 return COLOR_MOVED_ZEBRA_DIM;
288 else if (!strcmp(arg, "dimmed_zebra"))
289 return COLOR_MOVED_ZEBRA_DIM;
290 else
291 return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
292 }
293
294 static int parse_color_moved_ws(const char *arg)
295 {
296 int ret = 0;
297 struct string_list l = STRING_LIST_INIT_DUP;
298 struct string_list_item *i;
299
300 string_list_split(&l, arg, ',', -1);
301
302 for_each_string_list_item(i, &l) {
303 struct strbuf sb = STRBUF_INIT;
304 strbuf_addstr(&sb, i->string);
305 strbuf_trim(&sb);
306
307 if (!strcmp(sb.buf, "ignore-space-change"))
308 ret |= XDF_IGNORE_WHITESPACE_CHANGE;
309 else if (!strcmp(sb.buf, "ignore-space-at-eol"))
310 ret |= XDF_IGNORE_WHITESPACE_AT_EOL;
311 else if (!strcmp(sb.buf, "ignore-all-space"))
312 ret |= XDF_IGNORE_WHITESPACE;
313 else if (!strcmp(sb.buf, "allow-indentation-change"))
314 ret |= COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE;
315 else
316 error(_("ignoring unknown color-moved-ws mode '%s'"), sb.buf);
317
318 strbuf_release(&sb);
319 }
320
321 if ((ret & COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) &&
322 (ret & XDF_WHITESPACE_FLAGS))
323 die(_("color-moved-ws: allow-indentation-change cannot be combined with other white space modes"));
324
325 string_list_clear(&l, 0);
326
327 return ret;
328 }
329
330 int git_diff_ui_config(const char *var, const char *value, void *cb)
331 {
332 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
333 diff_use_color_default = git_config_colorbool(var, value);
334 return 0;
335 }
336 if (!strcmp(var, "diff.colormoved")) {
337 int cm = parse_color_moved(value);
338 if (cm < 0)
339 return -1;
340 diff_color_moved_default = cm;
341 return 0;
342 }
343 if (!strcmp(var, "diff.colormovedws")) {
344 int cm = parse_color_moved_ws(value);
345 if (cm < 0)
346 return -1;
347 diff_color_moved_ws_default = cm;
348 return 0;
349 }
350 if (!strcmp(var, "diff.context")) {
351 diff_context_default = git_config_int(var, value);
352 if (diff_context_default < 0)
353 return -1;
354 return 0;
355 }
356 if (!strcmp(var, "diff.interhunkcontext")) {
357 diff_interhunk_context_default = git_config_int(var, value);
358 if (diff_interhunk_context_default < 0)
359 return -1;
360 return 0;
361 }
362 if (!strcmp(var, "diff.renames")) {
363 diff_detect_rename_default = git_config_rename(var, value);
364 return 0;
365 }
366 if (!strcmp(var, "diff.autorefreshindex")) {
367 diff_auto_refresh_index = git_config_bool(var, value);
368 return 0;
369 }
370 if (!strcmp(var, "diff.mnemonicprefix")) {
371 diff_mnemonic_prefix = git_config_bool(var, value);
372 return 0;
373 }
374 if (!strcmp(var, "diff.noprefix")) {
375 diff_no_prefix = git_config_bool(var, value);
376 return 0;
377 }
378 if (!strcmp(var, "diff.statgraphwidth")) {
379 diff_stat_graph_width = git_config_int(var, value);
380 return 0;
381 }
382 if (!strcmp(var, "diff.external"))
383 return git_config_string(&external_diff_cmd_cfg, var, value);
384 if (!strcmp(var, "diff.wordregex"))
385 return git_config_string(&diff_word_regex_cfg, var, value);
386 if (!strcmp(var, "diff.orderfile"))
387 return git_config_pathname(&diff_order_file_cfg, var, value);
388
389 if (!strcmp(var, "diff.ignoresubmodules"))
390 handle_ignore_submodules_arg(&default_diff_options, value);
391
392 if (!strcmp(var, "diff.submodule")) {
393 if (parse_submodule_params(&default_diff_options, value))
394 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
395 value);
396 return 0;
397 }
398
399 if (!strcmp(var, "diff.algorithm")) {
400 diff_algorithm = parse_algorithm_value(value);
401 if (diff_algorithm < 0)
402 return -1;
403 return 0;
404 }
405
406 if (!strcmp(var, "diff.wserrorhighlight")) {
407 int val = parse_ws_error_highlight(value);
408 if (val < 0)
409 return -1;
410 ws_error_highlight_default = val;
411 return 0;
412 }
413
414 if (git_color_config(var, value, cb) < 0)
415 return -1;
416
417 return git_diff_basic_config(var, value, cb);
418 }
419
420 int git_diff_basic_config(const char *var, const char *value, void *cb)
421 {
422 const char *name;
423
424 if (!strcmp(var, "diff.renamelimit")) {
425 diff_rename_limit_default = git_config_int(var, value);
426 return 0;
427 }
428
429 if (userdiff_config(var, value) < 0)
430 return -1;
431
432 if (skip_prefix(var, "diff.color.", &name) ||
433 skip_prefix(var, "color.diff.", &name)) {
434 int slot = parse_diff_color_slot(name);
435 if (slot < 0)
436 return 0;
437 if (!value)
438 return config_error_nonbool(var);
439 return color_parse(value, diff_colors[slot]);
440 }
441
442 /* like GNU diff's --suppress-blank-empty option */
443 if (!strcmp(var, "diff.suppressblankempty") ||
444 /* for backwards compatibility */
445 !strcmp(var, "diff.suppress-blank-empty")) {
446 diff_suppress_blank_empty = git_config_bool(var, value);
447 return 0;
448 }
449
450 if (!strcmp(var, "diff.dirstat")) {
451 struct strbuf errmsg = STRBUF_INIT;
452 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
453 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
454 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
455 errmsg.buf);
456 strbuf_release(&errmsg);
457 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
458 return 0;
459 }
460
461 if (git_diff_heuristic_config(var, value, cb) < 0)
462 return -1;
463
464 return git_default_config(var, value, cb);
465 }
466
467 static char *quote_two(const char *one, const char *two)
468 {
469 int need_one = quote_c_style(one, NULL, NULL, 1);
470 int need_two = quote_c_style(two, NULL, NULL, 1);
471 struct strbuf res = STRBUF_INIT;
472
473 if (need_one + need_two) {
474 strbuf_addch(&res, '"');
475 quote_c_style(one, &res, NULL, 1);
476 quote_c_style(two, &res, NULL, 1);
477 strbuf_addch(&res, '"');
478 } else {
479 strbuf_addstr(&res, one);
480 strbuf_addstr(&res, two);
481 }
482 return strbuf_detach(&res, NULL);
483 }
484
485 static const char *external_diff(void)
486 {
487 static const char *external_diff_cmd = NULL;
488 static int done_preparing = 0;
489
490 if (done_preparing)
491 return external_diff_cmd;
492 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
493 if (!external_diff_cmd)
494 external_diff_cmd = external_diff_cmd_cfg;
495 done_preparing = 1;
496 return external_diff_cmd;
497 }
498
499 /*
500 * Keep track of files used for diffing. Sometimes such an entry
501 * refers to a temporary file, sometimes to an existing file, and
502 * sometimes to "/dev/null".
503 */
504 static struct diff_tempfile {
505 /*
506 * filename external diff should read from, or NULL if this
507 * entry is currently not in use:
508 */
509 const char *name;
510
511 char hex[GIT_MAX_HEXSZ + 1];
512 char mode[10];
513
514 /*
515 * If this diff_tempfile instance refers to a temporary file,
516 * this tempfile object is used to manage its lifetime.
517 */
518 struct tempfile *tempfile;
519 } diff_temp[2];
520
521 struct emit_callback {
522 int color_diff;
523 unsigned ws_rule;
524 int blank_at_eof_in_preimage;
525 int blank_at_eof_in_postimage;
526 int lno_in_preimage;
527 int lno_in_postimage;
528 const char **label_path;
529 struct diff_words_data *diff_words;
530 struct diff_options *opt;
531 struct strbuf *header;
532 };
533
534 static int count_lines(const char *data, int size)
535 {
536 int count, ch, completely_empty = 1, nl_just_seen = 0;
537 count = 0;
538 while (0 < size--) {
539 ch = *data++;
540 if (ch == '\n') {
541 count++;
542 nl_just_seen = 1;
543 completely_empty = 0;
544 }
545 else {
546 nl_just_seen = 0;
547 completely_empty = 0;
548 }
549 }
550 if (completely_empty)
551 return 0;
552 if (!nl_just_seen)
553 count++; /* no trailing newline */
554 return count;
555 }
556
557 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
558 {
559 if (!DIFF_FILE_VALID(one)) {
560 mf->ptr = (char *)""; /* does not matter */
561 mf->size = 0;
562 return 0;
563 }
564 else if (diff_populate_filespec(one, 0))
565 return -1;
566
567 mf->ptr = one->data;
568 mf->size = one->size;
569 return 0;
570 }
571
572 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
573 static unsigned long diff_filespec_size(struct diff_filespec *one)
574 {
575 if (!DIFF_FILE_VALID(one))
576 return 0;
577 diff_populate_filespec(one, CHECK_SIZE_ONLY);
578 return one->size;
579 }
580
581 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
582 {
583 char *ptr = mf->ptr;
584 long size = mf->size;
585 int cnt = 0;
586
587 if (!size)
588 return cnt;
589 ptr += size - 1; /* pointing at the very end */
590 if (*ptr != '\n')
591 ; /* incomplete line */
592 else
593 ptr--; /* skip the last LF */
594 while (mf->ptr < ptr) {
595 char *prev_eol;
596 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
597 if (*prev_eol == '\n')
598 break;
599 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
600 break;
601 cnt++;
602 ptr = prev_eol - 1;
603 }
604 return cnt;
605 }
606
607 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
608 struct emit_callback *ecbdata)
609 {
610 int l1, l2, at;
611 unsigned ws_rule = ecbdata->ws_rule;
612 l1 = count_trailing_blank(mf1, ws_rule);
613 l2 = count_trailing_blank(mf2, ws_rule);
614 if (l2 <= l1) {
615 ecbdata->blank_at_eof_in_preimage = 0;
616 ecbdata->blank_at_eof_in_postimage = 0;
617 return;
618 }
619 at = count_lines(mf1->ptr, mf1->size);
620 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
621
622 at = count_lines(mf2->ptr, mf2->size);
623 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
624 }
625
626 static void emit_line_0(struct diff_options *o,
627 const char *set_sign, const char *set, unsigned reverse, const char *reset,
628 int first, const char *line, int len)
629 {
630 int has_trailing_newline, has_trailing_carriage_return;
631 int needs_reset = 0; /* at the end of the line */
632 FILE *file = o->file;
633
634 fputs(diff_line_prefix(o), file);
635
636 has_trailing_newline = (len > 0 && line[len-1] == '\n');
637 if (has_trailing_newline)
638 len--;
639
640 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
641 if (has_trailing_carriage_return)
642 len--;
643
644 if (!len && !first)
645 goto end_of_line;
646
647 if (reverse && want_color(o->use_color)) {
648 fputs(GIT_COLOR_REVERSE, file);
649 needs_reset = 1;
650 }
651
652 if (set_sign) {
653 fputs(set_sign, file);
654 needs_reset = 1;
655 }
656
657 if (first)
658 fputc(first, file);
659
660 if (!len)
661 goto end_of_line;
662
663 if (set) {
664 if (set_sign && set != set_sign)
665 fputs(reset, file);
666 fputs(set, file);
667 needs_reset = 1;
668 }
669 fwrite(line, len, 1, file);
670 needs_reset = 1; /* 'line' may contain color codes. */
671
672 end_of_line:
673 if (needs_reset)
674 fputs(reset, file);
675 if (has_trailing_carriage_return)
676 fputc('\r', file);
677 if (has_trailing_newline)
678 fputc('\n', file);
679 }
680
681 static void emit_line(struct diff_options *o, const char *set, const char *reset,
682 const char *line, int len)
683 {
684 emit_line_0(o, set, NULL, 0, reset, 0, line, len);
685 }
686
687 enum diff_symbol {
688 DIFF_SYMBOL_BINARY_DIFF_HEADER,
689 DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
690 DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
691 DIFF_SYMBOL_BINARY_DIFF_BODY,
692 DIFF_SYMBOL_BINARY_DIFF_FOOTER,
693 DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
694 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
695 DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
696 DIFF_SYMBOL_STATS_LINE,
697 DIFF_SYMBOL_WORD_DIFF,
698 DIFF_SYMBOL_STAT_SEP,
699 DIFF_SYMBOL_SUMMARY,
700 DIFF_SYMBOL_SUBMODULE_ADD,
701 DIFF_SYMBOL_SUBMODULE_DEL,
702 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
703 DIFF_SYMBOL_SUBMODULE_MODIFIED,
704 DIFF_SYMBOL_SUBMODULE_HEADER,
705 DIFF_SYMBOL_SUBMODULE_ERROR,
706 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
707 DIFF_SYMBOL_REWRITE_DIFF,
708 DIFF_SYMBOL_BINARY_FILES,
709 DIFF_SYMBOL_HEADER,
710 DIFF_SYMBOL_FILEPAIR_PLUS,
711 DIFF_SYMBOL_FILEPAIR_MINUS,
712 DIFF_SYMBOL_WORDS_PORCELAIN,
713 DIFF_SYMBOL_WORDS,
714 DIFF_SYMBOL_CONTEXT,
715 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
716 DIFF_SYMBOL_PLUS,
717 DIFF_SYMBOL_MINUS,
718 DIFF_SYMBOL_NO_LF_EOF,
719 DIFF_SYMBOL_CONTEXT_FRAGINFO,
720 DIFF_SYMBOL_CONTEXT_MARKER,
721 DIFF_SYMBOL_SEPARATOR
722 };
723 /*
724 * Flags for content lines:
725 * 0..12 are whitespace rules
726 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
727 * 16 is marking if the line is blank at EOF
728 */
729 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
730 #define DIFF_SYMBOL_MOVED_LINE (1<<17)
731 #define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
732 #define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
733 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
734
735 /*
736 * This struct is used when we need to buffer the output of the diff output.
737 *
738 * NEEDSWORK: Instead of storing a copy of the line, add an offset pointer
739 * into the pre/post image file. This pointer could be a union with the
740 * line pointer. By storing an offset into the file instead of the literal line,
741 * we can decrease the memory footprint for the buffered output. At first we
742 * may want to only have indirection for the content lines, but we could also
743 * enhance the state for emitting prefabricated lines, e.g. the similarity
744 * score line or hunk/file headers would only need to store a number or path
745 * and then the output can be constructed later on depending on state.
746 */
747 struct emitted_diff_symbol {
748 const char *line;
749 int len;
750 int flags;
751 enum diff_symbol s;
752 };
753 #define EMITTED_DIFF_SYMBOL_INIT {NULL}
754
755 struct emitted_diff_symbols {
756 struct emitted_diff_symbol *buf;
757 int nr, alloc;
758 };
759 #define EMITTED_DIFF_SYMBOLS_INIT {NULL, 0, 0}
760
761 static void append_emitted_diff_symbol(struct diff_options *o,
762 struct emitted_diff_symbol *e)
763 {
764 struct emitted_diff_symbol *f;
765
766 ALLOC_GROW(o->emitted_symbols->buf,
767 o->emitted_symbols->nr + 1,
768 o->emitted_symbols->alloc);
769 f = &o->emitted_symbols->buf[o->emitted_symbols->nr++];
770
771 memcpy(f, e, sizeof(struct emitted_diff_symbol));
772 f->line = e->line ? xmemdupz(e->line, e->len) : NULL;
773 }
774
775 struct moved_entry {
776 struct hashmap_entry ent;
777 const struct emitted_diff_symbol *es;
778 struct moved_entry *next_line;
779 struct ws_delta *wsd;
780 };
781
782 /**
783 * The struct ws_delta holds white space differences between moved lines, i.e.
784 * between '+' and '-' lines that have been detected to be a move.
785 * The string contains the difference in leading white spaces, before the
786 * rest of the line is compared using the white space config for move
787 * coloring. The current_longer indicates if the first string in the
788 * comparision is longer than the second.
789 */
790 struct ws_delta {
791 char *string;
792 unsigned int current_longer : 1;
793 };
794 #define WS_DELTA_INIT { NULL, 0 }
795
796 static int compute_ws_delta(const struct emitted_diff_symbol *a,
797 const struct emitted_diff_symbol *b,
798 struct ws_delta *out)
799 {
800 const struct emitted_diff_symbol *longer = a->len > b->len ? a : b;
801 const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
802 int d = longer->len - shorter->len;
803
804 out->string = xmemdupz(longer->line, d);
805 out->current_longer = (a == longer);
806
807 return !strncmp(longer->line + d, shorter->line, shorter->len);
808 }
809
810 static int cmp_in_block_with_wsd(const struct diff_options *o,
811 const struct moved_entry *cur,
812 const struct moved_entry *match,
813 struct moved_entry *pmb,
814 int n)
815 {
816 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
817 int al = cur->es->len, cl = l->len;
818 const char *a = cur->es->line,
819 *b = match->es->line,
820 *c = l->line;
821
822 int wslen;
823
824 /*
825 * We need to check if 'cur' is equal to 'match'.
826 * As those are from the same (+/-) side, we do not need to adjust for
827 * indent changes. However these were found using fuzzy matching
828 * so we do have to check if they are equal.
829 */
830 if (strcmp(a, b))
831 return 1;
832
833 if (!pmb->wsd)
834 /*
835 * No white space delta was carried forward? This can happen
836 * when we exit early in this function and do not carry
837 * forward ws.
838 */
839 return 1;
840
841 /*
842 * The indent changes of the block are known and carried forward in
843 * pmb->wsd; however we need to check if the indent changes of the
844 * current line are still the same as before.
845 *
846 * To do so we need to compare 'l' to 'cur', adjusting the
847 * one of them for the white spaces, depending which was longer.
848 */
849
850 wslen = strlen(pmb->wsd->string);
851 if (pmb->wsd->current_longer) {
852 c += wslen;
853 cl -= wslen;
854 } else {
855 a += wslen;
856 al -= wslen;
857 }
858
859 if (strcmp(a, c))
860 return 1;
861
862 return 0;
863 }
864
865 static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
866 const void *entry,
867 const void *entry_or_key,
868 const void *keydata)
869 {
870 const struct diff_options *diffopt = hashmap_cmp_fn_data;
871 const struct moved_entry *a = entry;
872 const struct moved_entry *b = entry_or_key;
873 unsigned flags = diffopt->color_moved_ws_handling
874 & XDF_WHITESPACE_FLAGS;
875
876 if (diffopt->color_moved_ws_handling &
877 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
878 /*
879 * As there is not specific white space config given,
880 * we'd need to check for a new block, so ignore all
881 * white space. The setup of the white space
882 * configuration for the next block is done else where
883 */
884 flags |= XDF_IGNORE_WHITESPACE;
885
886 return !xdiff_compare_lines(a->es->line, a->es->len,
887 b->es->line, b->es->len,
888 flags);
889 }
890
891 static struct moved_entry *prepare_entry(struct diff_options *o,
892 int line_no)
893 {
894 struct moved_entry *ret = xmalloc(sizeof(*ret));
895 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[line_no];
896 unsigned flags = o->color_moved_ws_handling & XDF_WHITESPACE_FLAGS;
897
898 ret->ent.hash = xdiff_hash_string(l->line, l->len, flags);
899 ret->es = l;
900 ret->next_line = NULL;
901 ret->wsd = NULL;
902
903 return ret;
904 }
905
906 static void add_lines_to_move_detection(struct diff_options *o,
907 struct hashmap *add_lines,
908 struct hashmap *del_lines)
909 {
910 struct moved_entry *prev_line = NULL;
911
912 int n;
913 for (n = 0; n < o->emitted_symbols->nr; n++) {
914 struct hashmap *hm;
915 struct moved_entry *key;
916
917 switch (o->emitted_symbols->buf[n].s) {
918 case DIFF_SYMBOL_PLUS:
919 hm = add_lines;
920 break;
921 case DIFF_SYMBOL_MINUS:
922 hm = del_lines;
923 break;
924 default:
925 prev_line = NULL;
926 continue;
927 }
928
929 key = prepare_entry(o, n);
930 if (prev_line && prev_line->es->s == o->emitted_symbols->buf[n].s)
931 prev_line->next_line = key;
932
933 hashmap_add(hm, key);
934 prev_line = key;
935 }
936 }
937
938 static void pmb_advance_or_null(struct diff_options *o,
939 struct moved_entry *match,
940 struct hashmap *hm,
941 struct moved_entry **pmb,
942 int pmb_nr)
943 {
944 int i;
945 for (i = 0; i < pmb_nr; i++) {
946 struct moved_entry *prev = pmb[i];
947 struct moved_entry *cur = (prev && prev->next_line) ?
948 prev->next_line : NULL;
949 if (cur && !hm->cmpfn(o, cur, match, NULL)) {
950 pmb[i] = cur;
951 } else {
952 pmb[i] = NULL;
953 }
954 }
955 }
956
957 static void pmb_advance_or_null_multi_match(struct diff_options *o,
958 struct moved_entry *match,
959 struct hashmap *hm,
960 struct moved_entry **pmb,
961 int pmb_nr, int n)
962 {
963 int i;
964 char *got_match = xcalloc(1, pmb_nr);
965
966 for (; match; match = hashmap_get_next(hm, match)) {
967 for (i = 0; i < pmb_nr; i++) {
968 struct moved_entry *prev = pmb[i];
969 struct moved_entry *cur = (prev && prev->next_line) ?
970 prev->next_line : NULL;
971 if (!cur)
972 continue;
973 if (!cmp_in_block_with_wsd(o, cur, match, pmb[i], n))
974 got_match[i] |= 1;
975 }
976 }
977
978 for (i = 0; i < pmb_nr; i++) {
979 if (got_match[i]) {
980 /* Carry the white space delta forward */
981 pmb[i]->next_line->wsd = pmb[i]->wsd;
982 pmb[i] = pmb[i]->next_line;
983 } else
984 pmb[i] = NULL;
985 }
986 }
987
988 static int shrink_potential_moved_blocks(struct moved_entry **pmb,
989 int pmb_nr)
990 {
991 int lp, rp;
992
993 /* Shrink the set of potential block to the remaining running */
994 for (lp = 0, rp = pmb_nr - 1; lp <= rp;) {
995 while (lp < pmb_nr && pmb[lp])
996 lp++;
997 /* lp points at the first NULL now */
998
999 while (rp > -1 && !pmb[rp])
1000 rp--;
1001 /* rp points at the last non-NULL */
1002
1003 if (lp < pmb_nr && rp > -1 && lp < rp) {
1004 pmb[lp] = pmb[rp];
1005 if (pmb[rp]->wsd) {
1006 free(pmb[rp]->wsd->string);
1007 FREE_AND_NULL(pmb[rp]->wsd);
1008 }
1009 pmb[rp] = NULL;
1010 rp--;
1011 lp++;
1012 }
1013 }
1014
1015 /* Remember the number of running sets */
1016 return rp + 1;
1017 }
1018
1019 /*
1020 * If o->color_moved is COLOR_MOVED_PLAIN, this function does nothing.
1021 *
1022 * Otherwise, if the last block has fewer alphanumeric characters than
1023 * COLOR_MOVED_MIN_ALNUM_COUNT, unset DIFF_SYMBOL_MOVED_LINE on all lines in
1024 * that block.
1025 *
1026 * The last block consists of the (n - block_length)'th line up to but not
1027 * including the nth line.
1028 *
1029 * NEEDSWORK: This uses the same heuristic as blame_entry_score() in blame.c.
1030 * Think of a way to unify them.
1031 */
1032 static void adjust_last_block(struct diff_options *o, int n, int block_length)
1033 {
1034 int i, alnum_count = 0;
1035 if (o->color_moved == COLOR_MOVED_PLAIN)
1036 return;
1037 for (i = 1; i < block_length + 1; i++) {
1038 const char *c = o->emitted_symbols->buf[n - i].line;
1039 for (; *c; c++) {
1040 if (!isalnum(*c))
1041 continue;
1042 alnum_count++;
1043 if (alnum_count >= COLOR_MOVED_MIN_ALNUM_COUNT)
1044 return;
1045 }
1046 }
1047 for (i = 1; i < block_length + 1; i++)
1048 o->emitted_symbols->buf[n - i].flags &= ~DIFF_SYMBOL_MOVED_LINE;
1049 }
1050
1051 /* Find blocks of moved code, delegate actual coloring decision to helper */
1052 static void mark_color_as_moved(struct diff_options *o,
1053 struct hashmap *add_lines,
1054 struct hashmap *del_lines)
1055 {
1056 struct moved_entry **pmb = NULL; /* potentially moved blocks */
1057 int pmb_nr = 0, pmb_alloc = 0;
1058 int n, flipped_block = 1, block_length = 0;
1059
1060
1061 for (n = 0; n < o->emitted_symbols->nr; n++) {
1062 struct hashmap *hm = NULL;
1063 struct moved_entry *key;
1064 struct moved_entry *match = NULL;
1065 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1066
1067 switch (l->s) {
1068 case DIFF_SYMBOL_PLUS:
1069 hm = del_lines;
1070 key = prepare_entry(o, n);
1071 match = hashmap_get(hm, key, NULL);
1072 free(key);
1073 break;
1074 case DIFF_SYMBOL_MINUS:
1075 hm = add_lines;
1076 key = prepare_entry(o, n);
1077 match = hashmap_get(hm, key, NULL);
1078 free(key);
1079 break;
1080 default:
1081 flipped_block = 1;
1082 }
1083
1084 if (!match) {
1085 adjust_last_block(o, n, block_length);
1086 pmb_nr = 0;
1087 block_length = 0;
1088 continue;
1089 }
1090
1091 l->flags |= DIFF_SYMBOL_MOVED_LINE;
1092
1093 if (o->color_moved == COLOR_MOVED_PLAIN)
1094 continue;
1095
1096 if (o->color_moved_ws_handling &
1097 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
1098 pmb_advance_or_null_multi_match(o, match, hm, pmb, pmb_nr, n);
1099 else
1100 pmb_advance_or_null(o, match, hm, pmb, pmb_nr);
1101
1102 pmb_nr = shrink_potential_moved_blocks(pmb, pmb_nr);
1103
1104 if (pmb_nr == 0) {
1105 /*
1106 * The current line is the start of a new block.
1107 * Setup the set of potential blocks.
1108 */
1109 for (; match; match = hashmap_get_next(hm, match)) {
1110 ALLOC_GROW(pmb, pmb_nr + 1, pmb_alloc);
1111 if (o->color_moved_ws_handling &
1112 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE) {
1113 struct ws_delta *wsd = xmalloc(sizeof(*match->wsd));
1114 if (compute_ws_delta(l, match->es, wsd)) {
1115 match->wsd = wsd;
1116 pmb[pmb_nr++] = match;
1117 } else
1118 free(wsd);
1119 } else {
1120 pmb[pmb_nr++] = match;
1121 }
1122 }
1123
1124 flipped_block = (flipped_block + 1) % 2;
1125
1126 adjust_last_block(o, n, block_length);
1127 block_length = 0;
1128 }
1129
1130 block_length++;
1131
1132 if (flipped_block && o->color_moved != COLOR_MOVED_BLOCKS)
1133 l->flags |= DIFF_SYMBOL_MOVED_LINE_ALT;
1134 }
1135 adjust_last_block(o, n, block_length);
1136
1137 free(pmb);
1138 }
1139
1140 #define DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK \
1141 (DIFF_SYMBOL_MOVED_LINE | DIFF_SYMBOL_MOVED_LINE_ALT)
1142 static void dim_moved_lines(struct diff_options *o)
1143 {
1144 int n;
1145 for (n = 0; n < o->emitted_symbols->nr; n++) {
1146 struct emitted_diff_symbol *prev = (n != 0) ?
1147 &o->emitted_symbols->buf[n - 1] : NULL;
1148 struct emitted_diff_symbol *l = &o->emitted_symbols->buf[n];
1149 struct emitted_diff_symbol *next =
1150 (n < o->emitted_symbols->nr - 1) ?
1151 &o->emitted_symbols->buf[n + 1] : NULL;
1152
1153 /* Not a plus or minus line? */
1154 if (l->s != DIFF_SYMBOL_PLUS && l->s != DIFF_SYMBOL_MINUS)
1155 continue;
1156
1157 /* Not a moved line? */
1158 if (!(l->flags & DIFF_SYMBOL_MOVED_LINE))
1159 continue;
1160
1161 /*
1162 * If prev or next are not a plus or minus line,
1163 * pretend they don't exist
1164 */
1165 if (prev && prev->s != DIFF_SYMBOL_PLUS &&
1166 prev->s != DIFF_SYMBOL_MINUS)
1167 prev = NULL;
1168 if (next && next->s != DIFF_SYMBOL_PLUS &&
1169 next->s != DIFF_SYMBOL_MINUS)
1170 next = NULL;
1171
1172 /* Inside a block? */
1173 if ((prev &&
1174 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1175 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK)) &&
1176 (next &&
1177 (next->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK) ==
1178 (l->flags & DIFF_SYMBOL_MOVED_LINE_ZEBRA_MASK))) {
1179 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1180 continue;
1181 }
1182
1183 /* Check if we are at an interesting bound: */
1184 if (prev && (prev->flags & DIFF_SYMBOL_MOVED_LINE) &&
1185 (prev->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1186 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1187 continue;
1188 if (next && (next->flags & DIFF_SYMBOL_MOVED_LINE) &&
1189 (next->flags & DIFF_SYMBOL_MOVED_LINE_ALT) !=
1190 (l->flags & DIFF_SYMBOL_MOVED_LINE_ALT))
1191 continue;
1192
1193 /*
1194 * The boundary to prev and next are not interesting,
1195 * so this line is not interesting as a whole
1196 */
1197 l->flags |= DIFF_SYMBOL_MOVED_LINE_UNINTERESTING;
1198 }
1199 }
1200
1201 static void emit_line_ws_markup(struct diff_options *o,
1202 const char *set_sign, const char *set,
1203 const char *reset,
1204 char sign, const char *line, int len,
1205 unsigned ws_rule, int blank_at_eof)
1206 {
1207 const char *ws = NULL;
1208
1209 if (o->ws_error_highlight & ws_rule) {
1210 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
1211 if (!*ws)
1212 ws = NULL;
1213 }
1214
1215 if (!ws && !set_sign)
1216 emit_line_0(o, set, NULL, 0, reset, sign, line, len);
1217 else if (!ws) {
1218 emit_line_0(o, set_sign, set, !!set_sign, reset, sign, line, len);
1219 } else if (blank_at_eof)
1220 /* Blank line at EOF - paint '+' as well */
1221 emit_line_0(o, ws, NULL, 0, reset, sign, line, len);
1222 else {
1223 /* Emit just the prefix, then the rest. */
1224 emit_line_0(o, set_sign ? set_sign : set, NULL, !!set_sign, reset,
1225 sign, "", 0);
1226 ws_check_emit(line, len, ws_rule,
1227 o->file, set, reset, ws);
1228 }
1229 }
1230
1231 static void emit_diff_symbol_from_struct(struct diff_options *o,
1232 struct emitted_diff_symbol *eds)
1233 {
1234 static const char *nneof = " No newline at end of file\n";
1235 const char *context, *reset, *set, *set_sign, *meta, *fraginfo;
1236 struct strbuf sb = STRBUF_INIT;
1237
1238 enum diff_symbol s = eds->s;
1239 const char *line = eds->line;
1240 int len = eds->len;
1241 unsigned flags = eds->flags;
1242
1243 switch (s) {
1244 case DIFF_SYMBOL_NO_LF_EOF:
1245 context = diff_get_color_opt(o, DIFF_CONTEXT);
1246 reset = diff_get_color_opt(o, DIFF_RESET);
1247 putc('\n', o->file);
1248 emit_line_0(o, context, NULL, 0, reset, '\\',
1249 nneof, strlen(nneof));
1250 break;
1251 case DIFF_SYMBOL_SUBMODULE_HEADER:
1252 case DIFF_SYMBOL_SUBMODULE_ERROR:
1253 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
1254 case DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES:
1255 case DIFF_SYMBOL_SUMMARY:
1256 case DIFF_SYMBOL_STATS_LINE:
1257 case DIFF_SYMBOL_BINARY_DIFF_BODY:
1258 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
1259 emit_line(o, "", "", line, len);
1260 break;
1261 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
1262 case DIFF_SYMBOL_CONTEXT_MARKER:
1263 context = diff_get_color_opt(o, DIFF_CONTEXT);
1264 reset = diff_get_color_opt(o, DIFF_RESET);
1265 emit_line(o, context, reset, line, len);
1266 break;
1267 case DIFF_SYMBOL_SEPARATOR:
1268 fprintf(o->file, "%s%c",
1269 diff_line_prefix(o),
1270 o->line_termination);
1271 break;
1272 case DIFF_SYMBOL_CONTEXT:
1273 set = diff_get_color_opt(o, DIFF_CONTEXT);
1274 reset = diff_get_color_opt(o, DIFF_RESET);
1275 set_sign = NULL;
1276 if (o->flags.dual_color_diffed_diffs) {
1277 char c = !len ? 0 : line[0];
1278
1279 if (c == '+')
1280 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1281 else if (c == '@')
1282 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1283 else if (c == '-')
1284 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1285 }
1286 emit_line_ws_markup(o, set_sign, set, reset,
1287 o->output_indicators[OUTPUT_INDICATOR_CONTEXT],
1288 line, len,
1289 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
1290 break;
1291 case DIFF_SYMBOL_PLUS:
1292 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1293 DIFF_SYMBOL_MOVED_LINE_ALT |
1294 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1295 case DIFF_SYMBOL_MOVED_LINE |
1296 DIFF_SYMBOL_MOVED_LINE_ALT |
1297 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1298 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT_DIM);
1299 break;
1300 case DIFF_SYMBOL_MOVED_LINE |
1301 DIFF_SYMBOL_MOVED_LINE_ALT:
1302 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_ALT);
1303 break;
1304 case DIFF_SYMBOL_MOVED_LINE |
1305 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1306 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED_DIM);
1307 break;
1308 case DIFF_SYMBOL_MOVED_LINE:
1309 set = diff_get_color_opt(o, DIFF_FILE_NEW_MOVED);
1310 break;
1311 default:
1312 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1313 }
1314 reset = diff_get_color_opt(o, DIFF_RESET);
1315 if (!o->flags.dual_color_diffed_diffs)
1316 set_sign = NULL;
1317 else {
1318 char c = !len ? 0 : line[0];
1319
1320 set_sign = set;
1321 if (c == '-')
1322 set = diff_get_color_opt(o, DIFF_FILE_OLD_BOLD);
1323 else if (c == '@')
1324 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1325 else if (c == '+')
1326 set = diff_get_color_opt(o, DIFF_FILE_NEW_BOLD);
1327 else
1328 set = diff_get_color_opt(o, DIFF_CONTEXT_BOLD);
1329 flags &= ~DIFF_SYMBOL_CONTENT_WS_MASK;
1330 }
1331 emit_line_ws_markup(o, set_sign, set, reset,
1332 o->output_indicators[OUTPUT_INDICATOR_NEW],
1333 line, len,
1334 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
1335 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
1336 break;
1337 case DIFF_SYMBOL_MINUS:
1338 switch (flags & (DIFF_SYMBOL_MOVED_LINE |
1339 DIFF_SYMBOL_MOVED_LINE_ALT |
1340 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING)) {
1341 case DIFF_SYMBOL_MOVED_LINE |
1342 DIFF_SYMBOL_MOVED_LINE_ALT |
1343 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1344 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT_DIM);
1345 break;
1346 case DIFF_SYMBOL_MOVED_LINE |
1347 DIFF_SYMBOL_MOVED_LINE_ALT:
1348 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_ALT);
1349 break;
1350 case DIFF_SYMBOL_MOVED_LINE |
1351 DIFF_SYMBOL_MOVED_LINE_UNINTERESTING:
1352 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED_DIM);
1353 break;
1354 case DIFF_SYMBOL_MOVED_LINE:
1355 set = diff_get_color_opt(o, DIFF_FILE_OLD_MOVED);
1356 break;
1357 default:
1358 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1359 }
1360 reset = diff_get_color_opt(o, DIFF_RESET);
1361 if (!o->flags.dual_color_diffed_diffs)
1362 set_sign = NULL;
1363 else {
1364 char c = !len ? 0 : line[0];
1365
1366 set_sign = set;
1367 if (c == '+')
1368 set = diff_get_color_opt(o, DIFF_FILE_NEW_DIM);
1369 else if (c == '@')
1370 set = diff_get_color_opt(o, DIFF_FRAGINFO);
1371 else if (c == '-')
1372 set = diff_get_color_opt(o, DIFF_FILE_OLD_DIM);
1373 else
1374 set = diff_get_color_opt(o, DIFF_CONTEXT_DIM);
1375 }
1376 emit_line_ws_markup(o, set_sign, set, reset,
1377 o->output_indicators[OUTPUT_INDICATOR_OLD],
1378 line, len,
1379 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
1380 break;
1381 case DIFF_SYMBOL_WORDS_PORCELAIN:
1382 context = diff_get_color_opt(o, DIFF_CONTEXT);
1383 reset = diff_get_color_opt(o, DIFF_RESET);
1384 emit_line(o, context, reset, line, len);
1385 fputs("~\n", o->file);
1386 break;
1387 case DIFF_SYMBOL_WORDS:
1388 context = diff_get_color_opt(o, DIFF_CONTEXT);
1389 reset = diff_get_color_opt(o, DIFF_RESET);
1390 /*
1391 * Skip the prefix character, if any. With
1392 * diff_suppress_blank_empty, there may be
1393 * none.
1394 */
1395 if (line[0] != '\n') {
1396 line++;
1397 len--;
1398 }
1399 emit_line(o, context, reset, line, len);
1400 break;
1401 case DIFF_SYMBOL_FILEPAIR_PLUS:
1402 meta = diff_get_color_opt(o, DIFF_METAINFO);
1403 reset = diff_get_color_opt(o, DIFF_RESET);
1404 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
1405 line, reset,
1406 strchr(line, ' ') ? "\t" : "");
1407 break;
1408 case DIFF_SYMBOL_FILEPAIR_MINUS:
1409 meta = diff_get_color_opt(o, DIFF_METAINFO);
1410 reset = diff_get_color_opt(o, DIFF_RESET);
1411 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
1412 line, reset,
1413 strchr(line, ' ') ? "\t" : "");
1414 break;
1415 case DIFF_SYMBOL_BINARY_FILES:
1416 case DIFF_SYMBOL_HEADER:
1417 fprintf(o->file, "%s", line);
1418 break;
1419 case DIFF_SYMBOL_BINARY_DIFF_HEADER:
1420 fprintf(o->file, "%sGIT binary patch\n", diff_line_prefix(o));
1421 break;
1422 case DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA:
1423 fprintf(o->file, "%sdelta %s\n", diff_line_prefix(o), line);
1424 break;
1425 case DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL:
1426 fprintf(o->file, "%sliteral %s\n", diff_line_prefix(o), line);
1427 break;
1428 case DIFF_SYMBOL_BINARY_DIFF_FOOTER:
1429 fputs(diff_line_prefix(o), o->file);
1430 fputc('\n', o->file);
1431 break;
1432 case DIFF_SYMBOL_REWRITE_DIFF:
1433 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
1434 reset = diff_get_color_opt(o, DIFF_RESET);
1435 emit_line(o, fraginfo, reset, line, len);
1436 break;
1437 case DIFF_SYMBOL_SUBMODULE_ADD:
1438 set = diff_get_color_opt(o, DIFF_FILE_NEW);
1439 reset = diff_get_color_opt(o, DIFF_RESET);
1440 emit_line(o, set, reset, line, len);
1441 break;
1442 case DIFF_SYMBOL_SUBMODULE_DEL:
1443 set = diff_get_color_opt(o, DIFF_FILE_OLD);
1444 reset = diff_get_color_opt(o, DIFF_RESET);
1445 emit_line(o, set, reset, line, len);
1446 break;
1447 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
1448 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
1449 diff_line_prefix(o), line);
1450 break;
1451 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
1452 fprintf(o->file, "%sSubmodule %s contains modified content\n",
1453 diff_line_prefix(o), line);
1454 break;
1455 case DIFF_SYMBOL_STATS_SUMMARY_NO_FILES:
1456 emit_line(o, "", "", " 0 files changed\n",
1457 strlen(" 0 files changed\n"));
1458 break;
1459 case DIFF_SYMBOL_STATS_SUMMARY_ABBREV:
1460 emit_line(o, "", "", " ...\n", strlen(" ...\n"));
1461 break;
1462 case DIFF_SYMBOL_WORD_DIFF:
1463 fprintf(o->file, "%.*s", len, line);
1464 break;
1465 case DIFF_SYMBOL_STAT_SEP:
1466 fputs(o->stat_sep, o->file);
1467 break;
1468 default:
1469 BUG("unknown diff symbol");
1470 }
1471 strbuf_release(&sb);
1472 }
1473
1474 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
1475 const char *line, int len, unsigned flags)
1476 {
1477 struct emitted_diff_symbol e = {line, len, flags, s};
1478
1479 if (o->emitted_symbols)
1480 append_emitted_diff_symbol(o, &e);
1481 else
1482 emit_diff_symbol_from_struct(o, &e);
1483 }
1484
1485 void diff_emit_submodule_del(struct diff_options *o, const char *line)
1486 {
1487 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
1488 }
1489
1490 void diff_emit_submodule_add(struct diff_options *o, const char *line)
1491 {
1492 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
1493 }
1494
1495 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
1496 {
1497 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
1498 path, strlen(path), 0);
1499 }
1500
1501 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
1502 {
1503 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
1504 path, strlen(path), 0);
1505 }
1506
1507 void diff_emit_submodule_header(struct diff_options *o, const char *header)
1508 {
1509 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
1510 header, strlen(header), 0);
1511 }
1512
1513 void diff_emit_submodule_error(struct diff_options *o, const char *err)
1514 {
1515 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
1516 }
1517
1518 void diff_emit_submodule_pipethrough(struct diff_options *o,
1519 const char *line, int len)
1520 {
1521 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
1522 }
1523
1524 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
1525 {
1526 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
1527 ecbdata->blank_at_eof_in_preimage &&
1528 ecbdata->blank_at_eof_in_postimage &&
1529 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
1530 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
1531 return 0;
1532 return ws_blank_line(line, len, ecbdata->ws_rule);
1533 }
1534
1535 static void emit_add_line(const char *reset,
1536 struct emit_callback *ecbdata,
1537 const char *line, int len)
1538 {
1539 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
1540 if (new_blank_line_at_eof(ecbdata, line, len))
1541 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
1542
1543 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
1544 }
1545
1546 static void emit_del_line(const char *reset,
1547 struct emit_callback *ecbdata,
1548 const char *line, int len)
1549 {
1550 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
1551 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
1552 }
1553
1554 static void emit_context_line(const char *reset,
1555 struct emit_callback *ecbdata,
1556 const char *line, int len)
1557 {
1558 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
1559 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
1560 }
1561
1562 static void emit_hunk_header(struct emit_callback *ecbdata,
1563 const char *line, int len)
1564 {
1565 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1566 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
1567 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
1568 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1569 const char *reverse = ecbdata->color_diff ? GIT_COLOR_REVERSE : "";
1570 static const char atat[2] = { '@', '@' };
1571 const char *cp, *ep;
1572 struct strbuf msgbuf = STRBUF_INIT;
1573 int org_len = len;
1574 int i = 1;
1575
1576 /*
1577 * As a hunk header must begin with "@@ -<old>, +<new> @@",
1578 * it always is at least 10 bytes long.
1579 */
1580 if (len < 10 ||
1581 memcmp(line, atat, 2) ||
1582 !(ep = memmem(line + 2, len - 2, atat, 2))) {
1583 emit_diff_symbol(ecbdata->opt,
1584 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
1585 return;
1586 }
1587 ep += 2; /* skip over @@ */
1588
1589 /* The hunk header in fraginfo color */
1590 if (ecbdata->opt->flags.dual_color_diffed_diffs)
1591 strbuf_addstr(&msgbuf, reverse);
1592 strbuf_addstr(&msgbuf, frag);
1593 strbuf_add(&msgbuf, line, ep - line);
1594 strbuf_addstr(&msgbuf, reset);
1595
1596 /*
1597 * trailing "\r\n"
1598 */
1599 for ( ; i < 3; i++)
1600 if (line[len - i] == '\r' || line[len - i] == '\n')
1601 len--;
1602
1603 /* blank before the func header */
1604 for (cp = ep; ep - line < len; ep++)
1605 if (*ep != ' ' && *ep != '\t')
1606 break;
1607 if (ep != cp) {
1608 strbuf_addstr(&msgbuf, context);
1609 strbuf_add(&msgbuf, cp, ep - cp);
1610 strbuf_addstr(&msgbuf, reset);
1611 }
1612
1613 if (ep < line + len) {
1614 strbuf_addstr(&msgbuf, func);
1615 strbuf_add(&msgbuf, ep, line + len - ep);
1616 strbuf_addstr(&msgbuf, reset);
1617 }
1618
1619 strbuf_add(&msgbuf, line + len, org_len - len);
1620 strbuf_complete_line(&msgbuf);
1621 emit_diff_symbol(ecbdata->opt,
1622 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
1623 strbuf_release(&msgbuf);
1624 }
1625
1626 static struct diff_tempfile *claim_diff_tempfile(void) {
1627 int i;
1628 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
1629 if (!diff_temp[i].name)
1630 return diff_temp + i;
1631 BUG("diff is failing to clean up its tempfiles");
1632 }
1633
1634 static void remove_tempfile(void)
1635 {
1636 int i;
1637 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
1638 if (is_tempfile_active(diff_temp[i].tempfile))
1639 delete_tempfile(&diff_temp[i].tempfile);
1640 diff_temp[i].name = NULL;
1641 }
1642 }
1643
1644 static void add_line_count(struct strbuf *out, int count)
1645 {
1646 switch (count) {
1647 case 0:
1648 strbuf_addstr(out, "0,0");
1649 break;
1650 case 1:
1651 strbuf_addstr(out, "1");
1652 break;
1653 default:
1654 strbuf_addf(out, "1,%d", count);
1655 break;
1656 }
1657 }
1658
1659 static void emit_rewrite_lines(struct emit_callback *ecb,
1660 int prefix, const char *data, int size)
1661 {
1662 const char *endp = NULL;
1663 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
1664
1665 while (0 < size) {
1666 int len;
1667
1668 endp = memchr(data, '\n', size);
1669 len = endp ? (endp - data + 1) : size;
1670 if (prefix != '+') {
1671 ecb->lno_in_preimage++;
1672 emit_del_line(reset, ecb, data, len);
1673 } else {
1674 ecb->lno_in_postimage++;
1675 emit_add_line(reset, ecb, data, len);
1676 }
1677 size -= len;
1678 data += len;
1679 }
1680 if (!endp)
1681 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
1682 }
1683
1684 static void emit_rewrite_diff(const char *name_a,
1685 const char *name_b,
1686 struct diff_filespec *one,
1687 struct diff_filespec *two,
1688 struct userdiff_driver *textconv_one,
1689 struct userdiff_driver *textconv_two,
1690 struct diff_options *o)
1691 {
1692 int lc_a, lc_b;
1693 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1694 const char *a_prefix, *b_prefix;
1695 char *data_one, *data_two;
1696 size_t size_one, size_two;
1697 struct emit_callback ecbdata;
1698 struct strbuf out = STRBUF_INIT;
1699
1700 if (diff_mnemonic_prefix && o->flags.reverse_diff) {
1701 a_prefix = o->b_prefix;
1702 b_prefix = o->a_prefix;
1703 } else {
1704 a_prefix = o->a_prefix;
1705 b_prefix = o->b_prefix;
1706 }
1707
1708 name_a += (*name_a == '/');
1709 name_b += (*name_b == '/');
1710
1711 strbuf_reset(&a_name);
1712 strbuf_reset(&b_name);
1713 quote_two_c_style(&a_name, a_prefix, name_a, 0);
1714 quote_two_c_style(&b_name, b_prefix, name_b, 0);
1715
1716 size_one = fill_textconv(textconv_one, one, &data_one);
1717 size_two = fill_textconv(textconv_two, two, &data_two);
1718
1719 memset(&ecbdata, 0, sizeof(ecbdata));
1720 ecbdata.color_diff = want_color(o->use_color);
1721 ecbdata.ws_rule = whitespace_rule(name_b);
1722 ecbdata.opt = o;
1723 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
1724 mmfile_t mf1, mf2;
1725 mf1.ptr = (char *)data_one;
1726 mf2.ptr = (char *)data_two;
1727 mf1.size = size_one;
1728 mf2.size = size_two;
1729 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1730 }
1731 ecbdata.lno_in_preimage = 1;
1732 ecbdata.lno_in_postimage = 1;
1733
1734 lc_a = count_lines(data_one, size_one);
1735 lc_b = count_lines(data_two, size_two);
1736
1737 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1738 a_name.buf, a_name.len, 0);
1739 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1740 b_name.buf, b_name.len, 0);
1741
1742 strbuf_addstr(&out, "@@ -");
1743 if (!o->irreversible_delete)
1744 add_line_count(&out, lc_a);
1745 else
1746 strbuf_addstr(&out, "?,?");
1747 strbuf_addstr(&out, " +");
1748 add_line_count(&out, lc_b);
1749 strbuf_addstr(&out, " @@\n");
1750 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1751 strbuf_release(&out);
1752
1753 if (lc_a && !o->irreversible_delete)
1754 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1755 if (lc_b)
1756 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1757 if (textconv_one)
1758 free((char *)data_one);
1759 if (textconv_two)
1760 free((char *)data_two);
1761 }
1762
1763 struct diff_words_buffer {
1764 mmfile_t text;
1765 unsigned long alloc;
1766 struct diff_words_orig {
1767 const char *begin, *end;
1768 } *orig;
1769 int orig_nr, orig_alloc;
1770 };
1771
1772 static void diff_words_append(char *line, unsigned long len,
1773 struct diff_words_buffer *buffer)
1774 {
1775 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1776 line++;
1777 len--;
1778 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1779 buffer->text.size += len;
1780 buffer->text.ptr[buffer->text.size] = '\0';
1781 }
1782
1783 struct diff_words_style_elem {
1784 const char *prefix;
1785 const char *suffix;
1786 const char *color; /* NULL; filled in by the setup code if
1787 * color is enabled */
1788 };
1789
1790 struct diff_words_style {
1791 enum diff_words_type type;
1792 struct diff_words_style_elem new_word, old_word, ctx;
1793 const char *newline;
1794 };
1795
1796 static struct diff_words_style diff_words_styles[] = {
1797 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1798 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1799 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1800 };
1801
1802 struct diff_words_data {
1803 struct diff_words_buffer minus, plus;
1804 const char *current_plus;
1805 int last_minus;
1806 struct diff_options *opt;
1807 regex_t *word_regex;
1808 enum diff_words_type type;
1809 struct diff_words_style *style;
1810 };
1811
1812 static int fn_out_diff_words_write_helper(struct diff_options *o,
1813 struct diff_words_style_elem *st_el,
1814 const char *newline,
1815 size_t count, const char *buf)
1816 {
1817 int print = 0;
1818 struct strbuf sb = STRBUF_INIT;
1819
1820 while (count) {
1821 char *p = memchr(buf, '\n', count);
1822 if (print)
1823 strbuf_addstr(&sb, diff_line_prefix(o));
1824
1825 if (p != buf) {
1826 const char *reset = st_el->color && *st_el->color ?
1827 GIT_COLOR_RESET : NULL;
1828 if (st_el->color && *st_el->color)
1829 strbuf_addstr(&sb, st_el->color);
1830 strbuf_addstr(&sb, st_el->prefix);
1831 strbuf_add(&sb, buf, p ? p - buf : count);
1832 strbuf_addstr(&sb, st_el->suffix);
1833 if (reset)
1834 strbuf_addstr(&sb, reset);
1835 }
1836 if (!p)
1837 goto out;
1838
1839 strbuf_addstr(&sb, newline);
1840 count -= p + 1 - buf;
1841 buf = p + 1;
1842 print = 1;
1843 if (count) {
1844 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1845 sb.buf, sb.len, 0);
1846 strbuf_reset(&sb);
1847 }
1848 }
1849
1850 out:
1851 if (sb.len)
1852 emit_diff_symbol(o, DIFF_SYMBOL_WORD_DIFF,
1853 sb.buf, sb.len, 0);
1854 strbuf_release(&sb);
1855 return 0;
1856 }
1857
1858 /*
1859 * '--color-words' algorithm can be described as:
1860 *
1861 * 1. collect the minus/plus lines of a diff hunk, divided into
1862 * minus-lines and plus-lines;
1863 *
1864 * 2. break both minus-lines and plus-lines into words and
1865 * place them into two mmfile_t with one word for each line;
1866 *
1867 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1868 *
1869 * And for the common parts of the both file, we output the plus side text.
1870 * diff_words->current_plus is used to trace the current position of the plus file
1871 * which printed. diff_words->last_minus is used to trace the last minus word
1872 * printed.
1873 *
1874 * For '--graph' to work with '--color-words', we need to output the graph prefix
1875 * on each line of color words output. Generally, there are two conditions on
1876 * which we should output the prefix.
1877 *
1878 * 1. diff_words->last_minus == 0 &&
1879 * diff_words->current_plus == diff_words->plus.text.ptr
1880 *
1881 * that is: the plus text must start as a new line, and if there is no minus
1882 * word printed, a graph prefix must be printed.
1883 *
1884 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1885 * *(diff_words->current_plus - 1) == '\n'
1886 *
1887 * that is: a graph prefix must be printed following a '\n'
1888 */
1889 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1890 {
1891 if ((diff_words->last_minus == 0 &&
1892 diff_words->current_plus == diff_words->plus.text.ptr) ||
1893 (diff_words->current_plus > diff_words->plus.text.ptr &&
1894 *(diff_words->current_plus - 1) == '\n')) {
1895 return 1;
1896 } else {
1897 return 0;
1898 }
1899 }
1900
1901 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1902 {
1903 struct diff_words_data *diff_words = priv;
1904 struct diff_words_style *style = diff_words->style;
1905 int minus_first, minus_len, plus_first, plus_len;
1906 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1907 struct diff_options *opt = diff_words->opt;
1908 const char *line_prefix;
1909
1910 if (line[0] != '@' || parse_hunk_header(line, len,
1911 &minus_first, &minus_len, &plus_first, &plus_len))
1912 return;
1913
1914 assert(opt);
1915 line_prefix = diff_line_prefix(opt);
1916
1917 /* POSIX requires that first be decremented by one if len == 0... */
1918 if (minus_len) {
1919 minus_begin = diff_words->minus.orig[minus_first].begin;
1920 minus_end =
1921 diff_words->minus.orig[minus_first + minus_len - 1].end;
1922 } else
1923 minus_begin = minus_end =
1924 diff_words->minus.orig[minus_first].end;
1925
1926 if (plus_len) {
1927 plus_begin = diff_words->plus.orig[plus_first].begin;
1928 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1929 } else
1930 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1931
1932 if (color_words_output_graph_prefix(diff_words)) {
1933 fputs(line_prefix, diff_words->opt->file);
1934 }
1935 if (diff_words->current_plus != plus_begin) {
1936 fn_out_diff_words_write_helper(diff_words->opt,
1937 &style->ctx, style->newline,
1938 plus_begin - diff_words->current_plus,
1939 diff_words->current_plus);
1940 }
1941 if (minus_begin != minus_end) {
1942 fn_out_diff_words_write_helper(diff_words->opt,
1943 &style->old_word, style->newline,
1944 minus_end - minus_begin, minus_begin);
1945 }
1946 if (plus_begin != plus_end) {
1947 fn_out_diff_words_write_helper(diff_words->opt,
1948 &style->new_word, style->newline,
1949 plus_end - plus_begin, plus_begin);
1950 }
1951
1952 diff_words->current_plus = plus_end;
1953 diff_words->last_minus = minus_first;
1954 }
1955
1956 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1957 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1958 int *begin, int *end)
1959 {
1960 if (word_regex && *begin < buffer->size) {
1961 regmatch_t match[1];
1962 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1963 buffer->size - *begin, 1, match, 0)) {
1964 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1965 '\n', match[0].rm_eo - match[0].rm_so);
1966 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1967 *begin += match[0].rm_so;
1968 return *begin >= *end;
1969 }
1970 return -1;
1971 }
1972
1973 /* find the next word */
1974 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1975 (*begin)++;
1976 if (*begin >= buffer->size)
1977 return -1;
1978
1979 /* find the end of the word */
1980 *end = *begin + 1;
1981 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1982 (*end)++;
1983
1984 return 0;
1985 }
1986
1987 /*
1988 * This function splits the words in buffer->text, stores the list with
1989 * newline separator into out, and saves the offsets of the original words
1990 * in buffer->orig.
1991 */
1992 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1993 regex_t *word_regex)
1994 {
1995 int i, j;
1996 long alloc = 0;
1997
1998 out->size = 0;
1999 out->ptr = NULL;
2000
2001 /* fake an empty "0th" word */
2002 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
2003 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
2004 buffer->orig_nr = 1;
2005
2006 for (i = 0; i < buffer->text.size; i++) {
2007 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
2008 return;
2009
2010 /* store original boundaries */
2011 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
2012 buffer->orig_alloc);
2013 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
2014 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
2015 buffer->orig_nr++;
2016
2017 /* store one word */
2018 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2019 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
2020 out->ptr[out->size + j - i] = '\n';
2021 out->size += j - i + 1;
2022
2023 i = j - 1;
2024 }
2025 }
2026
2027 /* this executes the word diff on the accumulated buffers */
2028 static void diff_words_show(struct diff_words_data *diff_words)
2029 {
2030 xpparam_t xpp;
2031 xdemitconf_t xecfg;
2032 mmfile_t minus, plus;
2033 struct diff_words_style *style = diff_words->style;
2034
2035 struct diff_options *opt = diff_words->opt;
2036 const char *line_prefix;
2037
2038 assert(opt);
2039 line_prefix = diff_line_prefix(opt);
2040
2041 /* special case: only removal */
2042 if (!diff_words->plus.text.size) {
2043 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2044 line_prefix, strlen(line_prefix), 0);
2045 fn_out_diff_words_write_helper(diff_words->opt,
2046 &style->old_word, style->newline,
2047 diff_words->minus.text.size,
2048 diff_words->minus.text.ptr);
2049 diff_words->minus.text.size = 0;
2050 return;
2051 }
2052
2053 diff_words->current_plus = diff_words->plus.text.ptr;
2054 diff_words->last_minus = 0;
2055
2056 memset(&xpp, 0, sizeof(xpp));
2057 memset(&xecfg, 0, sizeof(xecfg));
2058 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
2059 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
2060 xpp.flags = 0;
2061 /* as only the hunk header will be parsed, we need a 0-context */
2062 xecfg.ctxlen = 0;
2063 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
2064 &xpp, &xecfg))
2065 die("unable to generate word diff");
2066 free(minus.ptr);
2067 free(plus.ptr);
2068 if (diff_words->current_plus != diff_words->plus.text.ptr +
2069 diff_words->plus.text.size) {
2070 if (color_words_output_graph_prefix(diff_words))
2071 emit_diff_symbol(diff_words->opt, DIFF_SYMBOL_WORD_DIFF,
2072 line_prefix, strlen(line_prefix), 0);
2073 fn_out_diff_words_write_helper(diff_words->opt,
2074 &style->ctx, style->newline,
2075 diff_words->plus.text.ptr + diff_words->plus.text.size
2076 - diff_words->current_plus, diff_words->current_plus);
2077 }
2078 diff_words->minus.text.size = diff_words->plus.text.size = 0;
2079 }
2080
2081 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
2082 static void diff_words_flush(struct emit_callback *ecbdata)
2083 {
2084 struct diff_options *wo = ecbdata->diff_words->opt;
2085
2086 if (ecbdata->diff_words->minus.text.size ||
2087 ecbdata->diff_words->plus.text.size)
2088 diff_words_show(ecbdata->diff_words);
2089
2090 if (wo->emitted_symbols) {
2091 struct diff_options *o = ecbdata->opt;
2092 struct emitted_diff_symbols *wol = wo->emitted_symbols;
2093 int i;
2094
2095 /*
2096 * NEEDSWORK:
2097 * Instead of appending each, concat all words to a line?
2098 */
2099 for (i = 0; i < wol->nr; i++)
2100 append_emitted_diff_symbol(o, &wol->buf[i]);
2101
2102 for (i = 0; i < wol->nr; i++)
2103 free((void *)wol->buf[i].line);
2104
2105 wol->nr = 0;
2106 }
2107 }
2108
2109 static void diff_filespec_load_driver(struct diff_filespec *one)
2110 {
2111 /* Use already-loaded driver */
2112 if (one->driver)
2113 return;
2114
2115 if (S_ISREG(one->mode))
2116 one->driver = userdiff_find_by_path(one->path);
2117
2118 /* Fallback to default settings */
2119 if (!one->driver)
2120 one->driver = userdiff_find_by_name("default");
2121 }
2122
2123 static const char *userdiff_word_regex(struct diff_filespec *one)
2124 {
2125 diff_filespec_load_driver(one);
2126 return one->driver->word_regex;
2127 }
2128
2129 static void init_diff_words_data(struct emit_callback *ecbdata,
2130 struct diff_options *orig_opts,
2131 struct diff_filespec *one,
2132 struct diff_filespec *two)
2133 {
2134 int i;
2135 struct diff_options *o = xmalloc(sizeof(struct diff_options));
2136 memcpy(o, orig_opts, sizeof(struct diff_options));
2137
2138 ecbdata->diff_words =
2139 xcalloc(1, sizeof(struct diff_words_data));
2140 ecbdata->diff_words->type = o->word_diff;
2141 ecbdata->diff_words->opt = o;
2142
2143 if (orig_opts->emitted_symbols)
2144 o->emitted_symbols =
2145 xcalloc(1, sizeof(struct emitted_diff_symbols));
2146
2147 if (!o->word_regex)
2148 o->word_regex = userdiff_word_regex(one);
2149 if (!o->word_regex)
2150 o->word_regex = userdiff_word_regex(two);
2151 if (!o->word_regex)
2152 o->word_regex = diff_word_regex_cfg;
2153 if (o->word_regex) {
2154 ecbdata->diff_words->word_regex = (regex_t *)
2155 xmalloc(sizeof(regex_t));
2156 if (regcomp(ecbdata->diff_words->word_regex,
2157 o->word_regex,
2158 REG_EXTENDED | REG_NEWLINE))
2159 die("invalid regular expression: %s",
2160 o->word_regex);
2161 }
2162 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2163 if (o->word_diff == diff_words_styles[i].type) {
2164 ecbdata->diff_words->style =
2165 &diff_words_styles[i];
2166 break;
2167 }
2168 }
2169 if (want_color(o->use_color)) {
2170 struct diff_words_style *st = ecbdata->diff_words->style;
2171 st->old_word.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2172 st->new_word.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2173 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
2174 }
2175 }
2176
2177 static void free_diff_words_data(struct emit_callback *ecbdata)
2178 {
2179 if (ecbdata->diff_words) {
2180 diff_words_flush(ecbdata);
2181 free (ecbdata->diff_words->opt->emitted_symbols);
2182 free (ecbdata->diff_words->opt);
2183 free (ecbdata->diff_words->minus.text.ptr);
2184 free (ecbdata->diff_words->minus.orig);
2185 free (ecbdata->diff_words->plus.text.ptr);
2186 free (ecbdata->diff_words->plus.orig);
2187 if (ecbdata->diff_words->word_regex) {
2188 regfree(ecbdata->diff_words->word_regex);
2189 free(ecbdata->diff_words->word_regex);
2190 }
2191 FREE_AND_NULL(ecbdata->diff_words);
2192 }
2193 }
2194
2195 const char *diff_get_color(int diff_use_color, enum color_diff ix)
2196 {
2197 if (want_color(diff_use_color))
2198 return diff_colors[ix];
2199 return "";
2200 }
2201
2202 const char *diff_line_prefix(struct diff_options *opt)
2203 {
2204 struct strbuf *msgbuf;
2205 if (!opt->output_prefix)
2206 return "";
2207
2208 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
2209 return msgbuf->buf;
2210 }
2211
2212 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
2213 {
2214 const char *cp;
2215 unsigned long allot;
2216 size_t l = len;
2217
2218 cp = line;
2219 allot = l;
2220 while (0 < l) {
2221 (void) utf8_width(&cp, &l);
2222 if (!cp)
2223 break; /* truncated in the middle? */
2224 }
2225 return allot - l;
2226 }
2227
2228 static void find_lno(const char *line, struct emit_callback *ecbdata)
2229 {
2230 const char *p;
2231 ecbdata->lno_in_preimage = 0;
2232 ecbdata->lno_in_postimage = 0;
2233 p = strchr(line, '-');
2234 if (!p)
2235 return; /* cannot happen */
2236 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
2237 p = strchr(p, '+');
2238 if (!p)
2239 return; /* cannot happen */
2240 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
2241 }
2242
2243 static void fn_out_consume(void *priv, char *line, unsigned long len)
2244 {
2245 struct emit_callback *ecbdata = priv;
2246 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
2247 struct diff_options *o = ecbdata->opt;
2248
2249 o->found_changes = 1;
2250
2251 if (ecbdata->header) {
2252 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2253 ecbdata->header->buf, ecbdata->header->len, 0);
2254 strbuf_reset(ecbdata->header);
2255 ecbdata->header = NULL;
2256 }
2257
2258 if (ecbdata->label_path[0]) {
2259 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
2260 ecbdata->label_path[0],
2261 strlen(ecbdata->label_path[0]), 0);
2262 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
2263 ecbdata->label_path[1],
2264 strlen(ecbdata->label_path[1]), 0);
2265 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
2266 }
2267
2268 if (diff_suppress_blank_empty
2269 && len == 2 && line[0] == ' ' && line[1] == '\n') {
2270 line[0] = '\n';
2271 len = 1;
2272 }
2273
2274 if (line[0] == '@') {
2275 if (ecbdata->diff_words)
2276 diff_words_flush(ecbdata);
2277 len = sane_truncate_line(ecbdata, line, len);
2278 find_lno(line, ecbdata);
2279 emit_hunk_header(ecbdata, line, len);
2280 return;
2281 }
2282
2283 if (ecbdata->diff_words) {
2284 enum diff_symbol s =
2285 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
2286 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
2287 if (line[0] == '-') {
2288 diff_words_append(line, len,
2289 &ecbdata->diff_words->minus);
2290 return;
2291 } else if (line[0] == '+') {
2292 diff_words_append(line, len,
2293 &ecbdata->diff_words->plus);
2294 return;
2295 } else if (starts_with(line, "\\ ")) {
2296 /*
2297 * Eat the "no newline at eof" marker as if we
2298 * saw a "+" or "-" line with nothing on it,
2299 * and return without diff_words_flush() to
2300 * defer processing. If this is the end of
2301 * preimage, more "+" lines may come after it.
2302 */
2303 return;
2304 }
2305 diff_words_flush(ecbdata);
2306 emit_diff_symbol(o, s, line, len, 0);
2307 return;
2308 }
2309
2310 switch (line[0]) {
2311 case '+':
2312 ecbdata->lno_in_postimage++;
2313 emit_add_line(reset, ecbdata, line + 1, len - 1);
2314 break;
2315 case '-':
2316 ecbdata->lno_in_preimage++;
2317 emit_del_line(reset, ecbdata, line + 1, len - 1);
2318 break;
2319 case ' ':
2320 ecbdata->lno_in_postimage++;
2321 ecbdata->lno_in_preimage++;
2322 emit_context_line(reset, ecbdata, line + 1, len - 1);
2323 break;
2324 default:
2325 /* incomplete line at the end */
2326 ecbdata->lno_in_preimage++;
2327 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
2328 line, len, 0);
2329 break;
2330 }
2331 }
2332
2333 static void pprint_rename(struct strbuf *name, const char *a, const char *b)
2334 {
2335 const char *old_name = a;
2336 const char *new_name = b;
2337 int pfx_length, sfx_length;
2338 int pfx_adjust_for_slash;
2339 int len_a = strlen(a);
2340 int len_b = strlen(b);
2341 int a_midlen, b_midlen;
2342 int qlen_a = quote_c_style(a, NULL, NULL, 0);
2343 int qlen_b = quote_c_style(b, NULL, NULL, 0);
2344
2345 if (qlen_a || qlen_b) {
2346 quote_c_style(a, name, NULL, 0);
2347 strbuf_addstr(name, " => ");
2348 quote_c_style(b, name, NULL, 0);
2349 return;
2350 }
2351
2352 /* Find common prefix */
2353 pfx_length = 0;
2354 while (*old_name && *new_name && *old_name == *new_name) {
2355 if (*old_name == '/')
2356 pfx_length = old_name - a + 1;
2357 old_name++;
2358 new_name++;
2359 }
2360
2361 /* Find common suffix */
2362 old_name = a + len_a;
2363 new_name = b + len_b;
2364 sfx_length = 0;
2365 /*
2366 * If there is a common prefix, it must end in a slash. In
2367 * that case we let this loop run 1 into the prefix to see the
2368 * same slash.
2369 *
2370 * If there is no common prefix, we cannot do this as it would
2371 * underrun the input strings.
2372 */
2373 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
2374 while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
2375 b + pfx_length - pfx_adjust_for_slash <= new_name &&
2376 *old_name == *new_name) {
2377 if (*old_name == '/')
2378 sfx_length = len_a - (old_name - a);
2379 old_name--;
2380 new_name--;
2381 }
2382
2383 /*
2384 * pfx{mid-a => mid-b}sfx
2385 * {pfx-a => pfx-b}sfx
2386 * pfx{sfx-a => sfx-b}
2387 * name-a => name-b
2388 */
2389 a_midlen = len_a - pfx_length - sfx_length;
2390 b_midlen = len_b - pfx_length - sfx_length;
2391 if (a_midlen < 0)
2392 a_midlen = 0;
2393 if (b_midlen < 0)
2394 b_midlen = 0;
2395
2396 strbuf_grow(name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
2397 if (pfx_length + sfx_length) {
2398 strbuf_add(name, a, pfx_length);
2399 strbuf_addch(name, '{');
2400 }
2401 strbuf_add(name, a + pfx_length, a_midlen);
2402 strbuf_addstr(name, " => ");
2403 strbuf_add(name, b + pfx_length, b_midlen);
2404 if (pfx_length + sfx_length) {
2405 strbuf_addch(name, '}');
2406 strbuf_add(name, a + len_a - sfx_length, sfx_length);
2407 }
2408 }
2409
2410 struct diffstat_t {
2411 int nr;
2412 int alloc;
2413 struct diffstat_file {
2414 char *from_name;
2415 char *name;
2416 char *print_name;
2417 const char *comments;
2418 unsigned is_unmerged:1;
2419 unsigned is_binary:1;
2420 unsigned is_renamed:1;
2421 unsigned is_interesting:1;
2422 uintmax_t added, deleted;
2423 } **files;
2424 };
2425
2426 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
2427 const char *name_a,
2428 const char *name_b)
2429 {
2430 struct diffstat_file *x;
2431 x = xcalloc(1, sizeof(*x));
2432 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
2433 diffstat->files[diffstat->nr++] = x;
2434 if (name_b) {
2435 x->from_name = xstrdup(name_a);
2436 x->name = xstrdup(name_b);
2437 x->is_renamed = 1;
2438 }
2439 else {
2440 x->from_name = NULL;
2441 x->name = xstrdup(name_a);
2442 }
2443 return x;
2444 }
2445
2446 static void diffstat_consume(void *priv, char *line, unsigned long len)
2447 {
2448 struct diffstat_t *diffstat = priv;
2449 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
2450
2451 if (line[0] == '+')
2452 x->added++;
2453 else if (line[0] == '-')
2454 x->deleted++;
2455 }
2456
2457 const char mime_boundary_leader[] = "------------";
2458
2459 static int scale_linear(int it, int width, int max_change)
2460 {
2461 if (!it)
2462 return 0;
2463 /*
2464 * make sure that at least one '-' or '+' is printed if
2465 * there is any change to this path. The easiest way is to
2466 * scale linearly as if the alloted width is one column shorter
2467 * than it is, and then add 1 to the result.
2468 */
2469 return 1 + (it * (width - 1) / max_change);
2470 }
2471
2472 static void show_graph(struct strbuf *out, char ch, int cnt,
2473 const char *set, const char *reset)
2474 {
2475 if (cnt <= 0)
2476 return;
2477 strbuf_addstr(out, set);
2478 strbuf_addchars(out, ch, cnt);
2479 strbuf_addstr(out, reset);
2480 }
2481
2482 static void fill_print_name(struct diffstat_file *file)
2483 {
2484 struct strbuf pname = STRBUF_INIT;
2485
2486 if (file->print_name)
2487 return;
2488
2489 if (file->is_renamed)
2490 pprint_rename(&pname, file->from_name, file->name);
2491 else
2492 quote_c_style(file->name, &pname, NULL, 0);
2493
2494 if (file->comments)
2495 strbuf_addf(&pname, " (%s)", file->comments);
2496
2497 file->print_name = strbuf_detach(&pname, NULL);
2498 }
2499
2500 static void print_stat_summary_inserts_deletes(struct diff_options *options,
2501 int files, int insertions, int deletions)
2502 {
2503 struct strbuf sb = STRBUF_INIT;
2504
2505 if (!files) {
2506 assert(insertions == 0 && deletions == 0);
2507 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_NO_FILES,
2508 NULL, 0, 0);
2509 return;
2510 }
2511
2512 strbuf_addf(&sb,
2513 (files == 1) ? " %d file changed" : " %d files changed",
2514 files);
2515
2516 /*
2517 * For binary diff, the caller may want to print "x files
2518 * changed" with insertions == 0 && deletions == 0.
2519 *
2520 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
2521 * is probably less confusing (i.e skip over "2 files changed
2522 * but nothing about added/removed lines? Is this a bug in Git?").
2523 */
2524 if (insertions || deletions == 0) {
2525 strbuf_addf(&sb,
2526 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
2527 insertions);
2528 }
2529
2530 if (deletions || insertions == 0) {
2531 strbuf_addf(&sb,
2532 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
2533 deletions);
2534 }
2535 strbuf_addch(&sb, '\n');
2536 emit_diff_symbol(options, DIFF_SYMBOL_STATS_SUMMARY_INSERTS_DELETES,
2537 sb.buf, sb.len, 0);
2538 strbuf_release(&sb);
2539 }
2540
2541 void print_stat_summary(FILE *fp, int files,
2542 int insertions, int deletions)
2543 {
2544 struct diff_options o;
2545 memset(&o, 0, sizeof(o));
2546 o.file = fp;
2547
2548 print_stat_summary_inserts_deletes(&o, files, insertions, deletions);
2549 }
2550
2551 static void show_stats(struct diffstat_t *data, struct diff_options *options)
2552 {
2553 int i, len, add, del, adds = 0, dels = 0;
2554 uintmax_t max_change = 0, max_len = 0;
2555 int total_files = data->nr, count;
2556 int width, name_width, graph_width, number_width = 0, bin_width = 0;
2557 const char *reset, *add_c, *del_c;
2558 int extra_shown = 0;
2559 const char *line_prefix = diff_line_prefix(options);
2560 struct strbuf out = STRBUF_INIT;
2561
2562 if (data->nr == 0)
2563 return;
2564
2565 count = options->stat_count ? options->stat_count : data->nr;
2566
2567 reset = diff_get_color_opt(options, DIFF_RESET);
2568 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
2569 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
2570
2571 /*
2572 * Find the longest filename and max number of changes
2573 */
2574 for (i = 0; (i < count) && (i < data->nr); i++) {
2575 struct diffstat_file *file = data->files[i];
2576 uintmax_t change = file->added + file->deleted;
2577
2578 if (!file->is_interesting && (change == 0)) {
2579 count++; /* not shown == room for one more */
2580 continue;
2581 }
2582 fill_print_name(file);
2583 len = strlen(file->print_name);
2584 if (max_len < len)
2585 max_len = len;
2586
2587 if (file->is_unmerged) {
2588 /* "Unmerged" is 8 characters */
2589 bin_width = bin_width < 8 ? 8 : bin_width;
2590 continue;
2591 }
2592 if (file->is_binary) {
2593 /* "Bin XXX -> YYY bytes" */
2594 int w = 14 + decimal_width(file->added)
2595 + decimal_width(file->deleted);
2596 bin_width = bin_width < w ? w : bin_width;
2597 /* Display change counts aligned with "Bin" */
2598 number_width = 3;
2599 continue;
2600 }
2601
2602 if (max_change < change)
2603 max_change = change;
2604 }
2605 count = i; /* where we can stop scanning in data->files[] */
2606
2607 /*
2608 * We have width = stat_width or term_columns() columns total.
2609 * We want a maximum of min(max_len, stat_name_width) for the name part.
2610 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
2611 * We also need 1 for " " and 4 + decimal_width(max_change)
2612 * for " | NNNN " and one the empty column at the end, altogether
2613 * 6 + decimal_width(max_change).
2614 *
2615 * If there's not enough space, we will use the smaller of
2616 * stat_name_width (if set) and 5/8*width for the filename,
2617 * and the rest for constant elements + graph part, but no more
2618 * than stat_graph_width for the graph part.
2619 * (5/8 gives 50 for filename and 30 for the constant parts + graph
2620 * for the standard terminal size).
2621 *
2622 * In other words: stat_width limits the maximum width, and
2623 * stat_name_width fixes the maximum width of the filename,
2624 * and is also used to divide available columns if there
2625 * aren't enough.
2626 *
2627 * Binary files are displayed with "Bin XXX -> YYY bytes"
2628 * instead of the change count and graph. This part is treated
2629 * similarly to the graph part, except that it is not
2630 * "scaled". If total width is too small to accommodate the
2631 * guaranteed minimum width of the filename part and the
2632 * separators and this message, this message will "overflow"
2633 * making the line longer than the maximum width.
2634 */
2635
2636 if (options->stat_width == -1)
2637 width = term_columns() - strlen(line_prefix);
2638 else
2639 width = options->stat_width ? options->stat_width : 80;
2640 number_width = decimal_width(max_change) > number_width ?
2641 decimal_width(max_change) : number_width;
2642
2643 if (options->stat_graph_width == -1)
2644 options->stat_graph_width = diff_stat_graph_width;
2645
2646 /*
2647 * Guarantee 3/8*16==6 for the graph part
2648 * and 5/8*16==10 for the filename part
2649 */
2650 if (width < 16 + 6 + number_width)
2651 width = 16 + 6 + number_width;
2652
2653 /*
2654 * First assign sizes that are wanted, ignoring available width.
2655 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
2656 * starting from "XXX" should fit in graph_width.
2657 */
2658 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
2659 if (options->stat_graph_width &&
2660 options->stat_graph_width < graph_width)
2661 graph_width = options->stat_graph_width;
2662
2663 name_width = (options->stat_name_width > 0 &&
2664 options->stat_name_width < max_len) ?
2665 options->stat_name_width : max_len;
2666
2667 /*
2668 * Adjust adjustable widths not to exceed maximum width
2669 */
2670 if (name_width + number_width + 6 + graph_width > width) {
2671 if (graph_width > width * 3/8 - number_width - 6) {
2672 graph_width = width * 3/8 - number_width - 6;
2673 if (graph_width < 6)
2674 graph_width = 6;
2675 }
2676
2677 if (options->stat_graph_width &&
2678 graph_width > options->stat_graph_width)
2679 graph_width = options->stat_graph_width;
2680 if (name_width > width - number_width - 6 - graph_width)
2681 name_width = width - number_width - 6 - graph_width;
2682 else
2683 graph_width = width - number_width - 6 - name_width;
2684 }
2685
2686 /*
2687 * From here name_width is the width of the name area,
2688 * and graph_width is the width of the graph area.
2689 * max_change is used to scale graph properly.
2690 */
2691 for (i = 0; i < count; i++) {
2692 const char *prefix = "";
2693 struct diffstat_file *file = data->files[i];
2694 char *name = file->print_name;
2695 uintmax_t added = file->added;
2696 uintmax_t deleted = file->deleted;
2697 int name_len;
2698
2699 if (!file->is_interesting && (added + deleted == 0))
2700 continue;
2701
2702 /*
2703 * "scale" the filename
2704 */
2705 len = name_width;
2706 name_len = strlen(name);
2707 if (name_width < name_len) {
2708 char *slash;
2709 prefix = "...";
2710 len -= 3;
2711 name += name_len - len;
2712 slash = strchr(name, '/');
2713 if (slash)
2714 name = slash;
2715 }
2716
2717 if (file->is_binary) {
2718 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2719 strbuf_addf(&out, " %*s", number_width, "Bin");
2720 if (!added && !deleted) {
2721 strbuf_addch(&out, '\n');
2722 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2723 out.buf, out.len, 0);
2724 strbuf_reset(&out);
2725 continue;
2726 }
2727 strbuf_addf(&out, " %s%"PRIuMAX"%s",
2728 del_c, deleted, reset);
2729 strbuf_addstr(&out, " -> ");
2730 strbuf_addf(&out, "%s%"PRIuMAX"%s",
2731 add_c, added, reset);
2732 strbuf_addstr(&out, " bytes\n");
2733 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2734 out.buf, out.len, 0);
2735 strbuf_reset(&out);
2736 continue;
2737 }
2738 else if (file->is_unmerged) {
2739 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2740 strbuf_addstr(&out, " Unmerged\n");
2741 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2742 out.buf, out.len, 0);
2743 strbuf_reset(&out);
2744 continue;
2745 }
2746
2747 /*
2748 * scale the add/delete
2749 */
2750 add = added;
2751 del = deleted;
2752
2753 if (graph_width <= max_change) {
2754 int total = scale_linear(add + del, graph_width, max_change);
2755 if (total < 2 && add && del)
2756 /* width >= 2 due to the sanity check */
2757 total = 2;
2758 if (add < del) {
2759 add = scale_linear(add, graph_width, max_change);
2760 del = total - add;
2761 } else {
2762 del = scale_linear(del, graph_width, max_change);
2763 add = total - del;
2764 }
2765 }
2766 strbuf_addf(&out, " %s%-*s |", prefix, len, name);
2767 strbuf_addf(&out, " %*"PRIuMAX"%s",
2768 number_width, added + deleted,
2769 added + deleted ? " " : "");
2770 show_graph(&out, '+', add, add_c, reset);
2771 show_graph(&out, '-', del, del_c, reset);
2772 strbuf_addch(&out, '\n');
2773 emit_diff_symbol(options, DIFF_SYMBOL_STATS_LINE,
2774 out.buf, out.len, 0);
2775 strbuf_reset(&out);
2776 }
2777
2778 for (i = 0; i < data->nr; i++) {
2779 struct diffstat_file *file = data->files[i];
2780 uintmax_t added = file->added;
2781 uintmax_t deleted = file->deleted;
2782
2783 if (file->is_unmerged ||
2784 (!file->is_interesting && (added + deleted == 0))) {
2785 total_files--;
2786 continue;
2787 }
2788
2789 if (!file->is_binary) {
2790 adds += added;
2791 dels += deleted;
2792 }
2793 if (i < count)
2794 continue;
2795 if (!extra_shown)
2796 emit_diff_symbol(options,
2797 DIFF_SYMBOL_STATS_SUMMARY_ABBREV,
2798 NULL, 0, 0);
2799 extra_shown = 1;
2800 }
2801
2802 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2803 strbuf_release(&out);
2804 }
2805
2806 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2807 {
2808 int i, adds = 0, dels = 0, total_files = data->nr;
2809
2810 if (data->nr == 0)
2811 return;
2812
2813 for (i = 0; i < data->nr; i++) {
2814 int added = data->files[i]->added;
2815 int deleted = data->files[i]->deleted;
2816
2817 if (data->files[i]->is_unmerged ||
2818 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2819 total_files--;
2820 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2821 adds += added;
2822 dels += deleted;
2823 }
2824 }
2825 print_stat_summary_inserts_deletes(options, total_files, adds, dels);
2826 }
2827
2828 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2829 {
2830 int i;
2831
2832 if (data->nr == 0)
2833 return;
2834
2835 for (i = 0; i < data->nr; i++) {
2836 struct diffstat_file *file = data->files[i];
2837
2838 fprintf(options->file, "%s", diff_line_prefix(options));
2839
2840 if (file->is_binary)
2841 fprintf(options->file, "-\t-\t");
2842 else
2843 fprintf(options->file,
2844 "%"PRIuMAX"\t%"PRIuMAX"\t",
2845 file->added, file->deleted);
2846 if (options->line_termination) {
2847 fill_print_name(file);
2848 if (!file->is_renamed)
2849 write_name_quoted(file->name, options->file,
2850 options->line_termination);
2851 else {
2852 fputs(file->print_name, options->file);
2853 putc(options->line_termination, options->file);
2854 }
2855 } else {
2856 if (file->is_renamed) {
2857 putc('\0', options->file);
2858 write_name_quoted(file->from_name, options->file, '\0');
2859 }
2860 write_name_quoted(file->name, options->file, '\0');
2861 }
2862 }
2863 }
2864
2865 struct dirstat_file {
2866 const char *name;
2867 unsigned long changed;
2868 };
2869
2870 struct dirstat_dir {
2871 struct dirstat_file *files;
2872 int alloc, nr, permille, cumulative;
2873 };
2874
2875 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2876 unsigned long changed, const char *base, int baselen)
2877 {
2878 unsigned long sum_changes = 0;
2879 unsigned int sources = 0;
2880 const char *line_prefix = diff_line_prefix(opt);
2881
2882 while (dir->nr) {
2883 struct dirstat_file *f = dir->files;
2884 int namelen = strlen(f->name);
2885 unsigned long changes;
2886 char *slash;
2887
2888 if (namelen < baselen)
2889 break;
2890 if (memcmp(f->name, base, baselen))
2891 break;
2892 slash = strchr(f->name + baselen, '/');
2893 if (slash) {
2894 int newbaselen = slash + 1 - f->name;
2895 changes = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2896 sources++;
2897 } else {
2898 changes = f->changed;
2899 dir->files++;
2900 dir->nr--;
2901 sources += 2;
2902 }
2903 sum_changes += changes;
2904 }
2905
2906 /*
2907 * We don't report dirstat's for
2908 * - the top level
2909 * - or cases where everything came from a single directory
2910 * under this directory (sources == 1).
2911 */
2912 if (baselen && sources != 1) {
2913 if (sum_changes) {
2914 int permille = sum_changes * 1000 / changed;
2915 if (permille >= dir->permille) {
2916 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2917 permille / 10, permille % 10, baselen, base);
2918 if (!dir->cumulative)
2919 return 0;
2920 }
2921 }
2922 }
2923 return sum_changes;
2924 }
2925
2926 static int dirstat_compare(const void *_a, const void *_b)
2927 {
2928 const struct dirstat_file *a = _a;
2929 const struct dirstat_file *b = _b;
2930 return strcmp(a->name, b->name);
2931 }
2932
2933 static void show_dirstat(struct diff_options *options)
2934 {
2935 int i;
2936 unsigned long changed;
2937 struct dirstat_dir dir;
2938 struct diff_queue_struct *q = &diff_queued_diff;
2939
2940 dir.files = NULL;
2941 dir.alloc = 0;
2942 dir.nr = 0;
2943 dir.permille = options->dirstat_permille;
2944 dir.cumulative = options->flags.dirstat_cumulative;
2945
2946 changed = 0;
2947 for (i = 0; i < q->nr; i++) {
2948 struct diff_filepair *p = q->queue[i];
2949 const char *name;
2950 unsigned long copied, added, damage;
2951
2952 name = p->two->path ? p->two->path : p->one->path;
2953
2954 if (p->one->oid_valid && p->two->oid_valid &&
2955 oideq(&p->one->oid, &p->two->oid)) {
2956 /*
2957 * The SHA1 has not changed, so pre-/post-content is
2958 * identical. We can therefore skip looking at the
2959 * file contents altogether.
2960 */
2961 damage = 0;
2962 goto found_damage;
2963 }
2964
2965 if (options->flags.dirstat_by_file) {
2966 /*
2967 * In --dirstat-by-file mode, we don't really need to
2968 * look at the actual file contents at all.
2969 * The fact that the SHA1 changed is enough for us to
2970 * add this file to the list of results
2971 * (with each file contributing equal damage).
2972 */
2973 damage = 1;
2974 goto found_damage;
2975 }
2976
2977 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2978 diff_populate_filespec(p->one, 0);
2979 diff_populate_filespec(p->two, 0);
2980 diffcore_count_changes(p->one, p->two, NULL, NULL,
2981 &copied, &added);
2982 diff_free_filespec_data(p->one);
2983 diff_free_filespec_data(p->two);
2984 } else if (DIFF_FILE_VALID(p->one)) {
2985 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2986 copied = added = 0;
2987 diff_free_filespec_data(p->one);
2988 } else if (DIFF_FILE_VALID(p->two)) {
2989 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2990 copied = 0;
2991 added = p->two->size;
2992 diff_free_filespec_data(p->two);
2993 } else
2994 continue;
2995
2996 /*
2997 * Original minus copied is the removed material,
2998 * added is the new material. They are both damages
2999 * made to the preimage.
3000 * If the resulting damage is zero, we know that
3001 * diffcore_count_changes() considers the two entries to
3002 * be identical, but since the oid changed, we
3003 * know that there must have been _some_ kind of change,
3004 * so we force all entries to have damage > 0.
3005 */
3006 damage = (p->one->size - copied) + added;
3007 if (!damage)
3008 damage = 1;
3009
3010 found_damage:
3011 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3012 dir.files[dir.nr].name = name;
3013 dir.files[dir.nr].changed = damage;
3014 changed += damage;
3015 dir.nr++;
3016 }
3017
3018 /* This can happen even with many files, if everything was renames */
3019 if (!changed)
3020 return;
3021
3022 /* Show all directories with more than x% of the changes */
3023 QSORT(dir.files, dir.nr, dirstat_compare);
3024 gather_dirstat(options, &dir, changed, "", 0);
3025 }
3026
3027 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
3028 {
3029 int i;
3030 unsigned long changed;
3031 struct dirstat_dir dir;
3032
3033 if (data->nr == 0)
3034 return;
3035
3036 dir.files = NULL;
3037 dir.alloc = 0;
3038 dir.nr = 0;
3039 dir.permille = options->dirstat_permille;
3040 dir.cumulative = options->flags.dirstat_cumulative;
3041
3042 changed = 0;
3043 for (i = 0; i < data->nr; i++) {
3044 struct diffstat_file *file = data->files[i];
3045 unsigned long damage = file->added + file->deleted;
3046 if (file->is_binary)
3047 /*
3048 * binary files counts bytes, not lines. Must find some
3049 * way to normalize binary bytes vs. textual lines.
3050 * The following heuristic assumes that there are 64
3051 * bytes per "line".
3052 * This is stupid and ugly, but very cheap...
3053 */
3054 damage = DIV_ROUND_UP(damage, 64);
3055 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
3056 dir.files[dir.nr].name = file->name;
3057 dir.files[dir.nr].changed = damage;
3058 changed += damage;
3059 dir.nr++;
3060 }
3061
3062 /* This can happen even with many files, if everything was renames */
3063 if (!changed)
3064 return;
3065
3066 /* Show all directories with more than x% of the changes */
3067 QSORT(dir.files, dir.nr, dirstat_compare);
3068 gather_dirstat(options, &dir, changed, "", 0);
3069 }
3070
3071 static void free_diffstat_info(struct diffstat_t *diffstat)
3072 {
3073 int i;
3074 for (i = 0; i < diffstat->nr; i++) {
3075 struct diffstat_file *f = diffstat->files[i];
3076 free(f->print_name);
3077 free(f->name);
3078 free(f->from_name);
3079 free(f);
3080 }
3081 free(diffstat->files);
3082 }
3083
3084 struct checkdiff_t {
3085 const char *filename;
3086 int lineno;
3087 int conflict_marker_size;
3088 struct diff_options *o;
3089 unsigned ws_rule;
3090 unsigned status;
3091 };
3092
3093 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
3094 {
3095 char firstchar;
3096 int cnt;
3097
3098 if (len < marker_size + 1)
3099 return 0;
3100 firstchar = line[0];
3101 switch (firstchar) {
3102 case '=': case '>': case '<': case '|':
3103 break;
3104 default:
3105 return 0;
3106 }
3107 for (cnt = 1; cnt < marker_size; cnt++)
3108 if (line[cnt] != firstchar)
3109 return 0;
3110 /* line[1] thru line[marker_size-1] are same as firstchar */
3111 if (len < marker_size + 1 || !isspace(line[marker_size]))
3112 return 0;
3113 return 1;
3114 }
3115
3116 static void checkdiff_consume(void *priv, char *line, unsigned long len)
3117 {
3118 struct checkdiff_t *data = priv;
3119 int marker_size = data->conflict_marker_size;
3120 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
3121 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
3122 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
3123 char *err;
3124 const char *line_prefix;
3125
3126 assert(data->o);
3127 line_prefix = diff_line_prefix(data->o);
3128
3129 if (line[0] == '+') {
3130 unsigned bad;
3131 data->lineno++;
3132 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
3133 data->status |= 1;
3134 fprintf(data->o->file,
3135 "%s%s:%d: leftover conflict marker\n",
3136 line_prefix, data->filename, data->lineno);
3137 }
3138 bad = ws_check(line + 1, len - 1, data->ws_rule);
3139 if (!bad)
3140 return;
3141 data->status |= bad;
3142 err = whitespace_error_string(bad);
3143 fprintf(data->o->file, "%s%s:%d: %s.\n",
3144 line_prefix, data->filename, data->lineno, err);
3145 free(err);
3146 emit_line(data->o, set, reset, line, 1);
3147 ws_check_emit(line + 1, len - 1, data->ws_rule,
3148 data->o->file, set, reset, ws);
3149 } else if (line[0] == ' ') {
3150 data->lineno++;
3151 } else if (line[0] == '@') {
3152 char *plus = strchr(line, '+');
3153 if (plus)
3154 data->lineno = strtol(plus, NULL, 10) - 1;
3155 else
3156 die("invalid diff");
3157 }
3158 }
3159
3160 static unsigned char *deflate_it(char *data,
3161 unsigned long size,
3162 unsigned long *result_size)
3163 {
3164 int bound;
3165 unsigned char *deflated;
3166 git_zstream stream;
3167
3168 git_deflate_init(&stream, zlib_compression_level);
3169 bound = git_deflate_bound(&stream, size);
3170 deflated = xmalloc(bound);
3171 stream.next_out = deflated;
3172 stream.avail_out = bound;
3173
3174 stream.next_in = (unsigned char *)data;
3175 stream.avail_in = size;
3176 while (git_deflate(&stream, Z_FINISH) == Z_OK)
3177 ; /* nothing */
3178 git_deflate_end(&stream);
3179 *result_size = stream.total_out;
3180 return deflated;
3181 }
3182
3183 static void emit_binary_diff_body(struct diff_options *o,
3184 mmfile_t *one, mmfile_t *two)
3185 {
3186 void *cp;
3187 void *delta;
3188 void *deflated;
3189 void *data;
3190 unsigned long orig_size;
3191 unsigned long delta_size;
3192 unsigned long deflate_size;
3193 unsigned long data_size;
3194
3195 /* We could do deflated delta, or we could do just deflated two,
3196 * whichever is smaller.
3197 */
3198 delta = NULL;
3199 deflated = deflate_it(two->ptr, two->size, &deflate_size);
3200 if (one->size && two->size) {
3201 delta = diff_delta(one->ptr, one->size,
3202 two->ptr, two->size,
3203 &delta_size, deflate_size);
3204 if (delta) {
3205 void *to_free = delta;
3206 orig_size = delta_size;
3207 delta = deflate_it(delta, delta_size, &delta_size);
3208 free(to_free);
3209 }
3210 }
3211
3212 if (delta && delta_size < deflate_size) {
3213 char *s = xstrfmt("%lu", orig_size);
3214 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_DELTA,
3215 s, strlen(s), 0);
3216 free(s);
3217 free(deflated);
3218 data = delta;
3219 data_size = delta_size;
3220 } else {
3221 char *s = xstrfmt("%lu", two->size);
3222 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER_LITERAL,
3223 s, strlen(s), 0);
3224 free(s);
3225 free(delta);
3226 data = deflated;
3227 data_size = deflate_size;
3228 }
3229
3230 /* emit data encoded in base85 */
3231 cp = data;
3232 while (data_size) {
3233 int len;
3234 int bytes = (52 < data_size) ? 52 : data_size;
3235 char line[71];
3236 data_size -= bytes;
3237 if (bytes <= 26)
3238 line[0] = bytes + 'A' - 1;
3239 else
3240 line[0] = bytes - 26 + 'a' - 1;
3241 encode_85(line + 1, cp, bytes);
3242 cp = (char *) cp + bytes;
3243
3244 len = strlen(line);
3245 line[len++] = '\n';
3246 line[len] = '\0';
3247
3248 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_BODY,
3249 line, len, 0);
3250 }
3251 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_FOOTER, NULL, 0, 0);
3252 free(data);
3253 }
3254
3255 static void emit_binary_diff(struct diff_options *o,
3256 mmfile_t *one, mmfile_t *two)
3257 {
3258 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_DIFF_HEADER, NULL, 0, 0);
3259 emit_binary_diff_body(o, one, two);
3260 emit_binary_diff_body(o, two, one);
3261 }
3262
3263 int diff_filespec_is_binary(struct diff_filespec *one)
3264 {
3265 if (one->is_binary == -1) {
3266 diff_filespec_load_driver(one);
3267 if (one->driver->binary != -1)
3268 one->is_binary = one->driver->binary;
3269 else {
3270 if (!one->data && DIFF_FILE_VALID(one))
3271 diff_populate_filespec(one, CHECK_BINARY);
3272 if (one->is_binary == -1 && one->data)
3273 one->is_binary = buffer_is_binary(one->data,
3274 one->size);
3275 if (one->is_binary == -1)
3276 one->is_binary = 0;
3277 }
3278 }
3279 return one->is_binary;
3280 }
3281
3282 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
3283 {
3284 diff_filespec_load_driver(one);
3285 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
3286 }
3287
3288 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
3289 {
3290 if (!options->a_prefix)
3291 options->a_prefix = a;
3292 if (!options->b_prefix)
3293 options->b_prefix = b;
3294 }
3295
3296 struct userdiff_driver *get_textconv(struct diff_filespec *one)
3297 {
3298 if (!DIFF_FILE_VALID(one))
3299 return NULL;
3300
3301 diff_filespec_load_driver(one);
3302 return userdiff_get_textconv(one->driver);
3303 }
3304
3305 static void builtin_diff(const char *name_a,
3306 const char *name_b,
3307 struct diff_filespec *one,
3308 struct diff_filespec *two,
3309 const char *xfrm_msg,
3310 int must_show_header,
3311 struct diff_options *o,
3312 int complete_rewrite)
3313 {
3314 mmfile_t mf1, mf2;
3315 const char *lbl[2];
3316 char *a_one, *b_two;
3317 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
3318 const char *reset = diff_get_color_opt(o, DIFF_RESET);
3319 const char *a_prefix, *b_prefix;
3320 struct userdiff_driver *textconv_one = NULL;
3321 struct userdiff_driver *textconv_two = NULL;
3322 struct strbuf header = STRBUF_INIT;
3323 const char *line_prefix = diff_line_prefix(o);
3324
3325 diff_set_mnemonic_prefix(o, "a/", "b/");
3326 if (o->flags.reverse_diff) {
3327 a_prefix = o->b_prefix;
3328 b_prefix = o->a_prefix;
3329 } else {
3330 a_prefix = o->a_prefix;
3331 b_prefix = o->b_prefix;
3332 }
3333
3334 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
3335 (!one->mode || S_ISGITLINK(one->mode)) &&
3336 (!two->mode || S_ISGITLINK(two->mode))) {
3337 show_submodule_summary(o, one->path ? one->path : two->path,
3338 &one->oid, &two->oid,
3339 two->dirty_submodule);
3340 return;
3341 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
3342 (!one->mode || S_ISGITLINK(one->mode)) &&
3343 (!two->mode || S_ISGITLINK(two->mode))) {
3344 show_submodule_inline_diff(o, one->path ? one->path : two->path,
3345 &one->oid, &two->oid,
3346 two->dirty_submodule);
3347 return;
3348 }
3349
3350 if (o->flags.allow_textconv) {
3351 textconv_one = get_textconv(one);
3352 textconv_two = get_textconv(two);
3353 }
3354
3355 /* Never use a non-valid filename anywhere if at all possible */
3356 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
3357 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
3358
3359 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
3360 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
3361 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
3362 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
3363 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
3364 if (lbl[0][0] == '/') {
3365 /* /dev/null */
3366 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
3367 if (xfrm_msg)
3368 strbuf_addstr(&header, xfrm_msg);
3369 must_show_header = 1;
3370 }
3371 else if (lbl[1][0] == '/') {
3372 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
3373 if (xfrm_msg)
3374 strbuf_addstr(&header, xfrm_msg);
3375 must_show_header = 1;
3376 }
3377 else {
3378 if (one->mode != two->mode) {
3379 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
3380 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
3381 must_show_header = 1;
3382 }
3383 if (xfrm_msg)
3384 strbuf_addstr(&header, xfrm_msg);
3385
3386 /*
3387 * we do not run diff between different kind
3388 * of objects.
3389 */
3390 if ((one->mode ^ two->mode) & S_IFMT)
3391 goto free_ab_and_return;
3392 if (complete_rewrite &&
3393 (textconv_one || !diff_filespec_is_binary(one)) &&
3394 (textconv_two || !diff_filespec_is_binary(two))) {
3395 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3396 header.buf, header.len, 0);
3397 strbuf_reset(&header);
3398 emit_rewrite_diff(name_a, name_b, one, two,
3399 textconv_one, textconv_two, o);
3400 o->found_changes = 1;
3401 goto free_ab_and_return;
3402 }
3403 }
3404
3405 if (o->irreversible_delete && lbl[1][0] == '/') {
3406 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
3407 header.len, 0);
3408 strbuf_reset(&header);
3409 goto free_ab_and_return;
3410 } else if (!o->flags.text &&
3411 ( (!textconv_one && diff_filespec_is_binary(one)) ||
3412 (!textconv_two && diff_filespec_is_binary(two)) )) {
3413 struct strbuf sb = STRBUF_INIT;
3414 if (!one->data && !two->data &&
3415 S_ISREG(one->mode) && S_ISREG(two->mode) &&
3416 !o->flags.binary) {
3417 if (oideq(&one->oid, &two->oid)) {
3418 if (must_show_header)
3419 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3420 header.buf, header.len,
3421 0);
3422 goto free_ab_and_return;
3423 }
3424 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3425 header.buf, header.len, 0);
3426 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3427 diff_line_prefix(o), lbl[0], lbl[1]);
3428 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3429 sb.buf, sb.len, 0);
3430 strbuf_release(&sb);
3431 goto free_ab_and_return;
3432 }
3433 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3434 die("unable to read files to diff");
3435 /* Quite common confusing case */
3436 if (mf1.size == mf2.size &&
3437 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
3438 if (must_show_header)
3439 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3440 header.buf, header.len, 0);
3441 goto free_ab_and_return;
3442 }
3443 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
3444 strbuf_reset(&header);
3445 if (o->flags.binary)
3446 emit_binary_diff(o, &mf1, &mf2);
3447 else {
3448 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
3449 diff_line_prefix(o), lbl[0], lbl[1]);
3450 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
3451 sb.buf, sb.len, 0);
3452 strbuf_release(&sb);
3453 }
3454 o->found_changes = 1;
3455 } else {
3456 /* Crazy xdl interfaces.. */
3457 const char *diffopts = getenv("GIT_DIFF_OPTS");
3458 const char *v;
3459 xpparam_t xpp;
3460 xdemitconf_t xecfg;
3461 struct emit_callback ecbdata;
3462 const struct userdiff_funcname *pe;
3463
3464 if (must_show_header) {
3465 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
3466 header.buf, header.len, 0);
3467 strbuf_reset(&header);
3468 }
3469
3470 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
3471 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
3472
3473 pe = diff_funcname_pattern(one);
3474 if (!pe)
3475 pe = diff_funcname_pattern(two);
3476
3477 memset(&xpp, 0, sizeof(xpp));
3478 memset(&xecfg, 0, sizeof(xecfg));
3479 memset(&ecbdata, 0, sizeof(ecbdata));
3480 if (o->flags.suppress_diff_headers)
3481 lbl[0] = NULL;
3482 ecbdata.label_path = lbl;
3483 ecbdata.color_diff = want_color(o->use_color);
3484 ecbdata.ws_rule = whitespace_rule(name_b);
3485 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
3486 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3487 ecbdata.opt = o;
3488 if (header.len && !o->flags.suppress_diff_headers)
3489 ecbdata.header = &header;
3490 xpp.flags = o->xdl_opts;
3491 xpp.anchors = o->anchors;
3492 xpp.anchors_nr = o->anchors_nr;
3493 xecfg.ctxlen = o->context;
3494 xecfg.interhunkctxlen = o->interhunkcontext;
3495 xecfg.flags = XDL_EMIT_FUNCNAMES;
3496 if (o->flags.funccontext)
3497 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
3498 if (pe)
3499 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
3500 if (!diffopts)
3501 ;
3502 else if (skip_prefix(diffopts, "--unified=", &v))
3503 xecfg.ctxlen = strtoul(v, NULL, 10);
3504 else if (skip_prefix(diffopts, "-u", &v))
3505 xecfg.ctxlen = strtoul(v, NULL, 10);
3506 if (o->word_diff)
3507 init_diff_words_data(&ecbdata, o, one, two);
3508 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
3509 &xpp, &xecfg))
3510 die("unable to generate diff for %s", one->path);
3511 if (o->word_diff)
3512 free_diff_words_data(&ecbdata);
3513 if (textconv_one)
3514 free(mf1.ptr);
3515 if (textconv_two)
3516 free(mf2.ptr);
3517 xdiff_clear_find_func(&xecfg);
3518 }
3519
3520 free_ab_and_return:
3521 strbuf_release(&header);
3522 diff_free_filespec_data(one);
3523 diff_free_filespec_data(two);
3524 free(a_one);
3525 free(b_two);
3526 return;
3527 }
3528
3529 static char *get_compact_summary(const struct diff_filepair *p, int is_renamed)
3530 {
3531 if (!is_renamed) {
3532 if (p->status == DIFF_STATUS_ADDED) {
3533 if (S_ISLNK(p->two->mode))
3534 return "new +l";
3535 else if ((p->two->mode & 0777) == 0755)
3536 return "new +x";
3537 else
3538 return "new";
3539 } else if (p->status == DIFF_STATUS_DELETED)
3540 return "gone";
3541 }
3542 if (S_ISLNK(p->one->mode) && !S_ISLNK(p->two->mode))
3543 return "mode -l";
3544 else if (!S_ISLNK(p->one->mode) && S_ISLNK(p->two->mode))
3545 return "mode +l";
3546 else if ((p->one->mode & 0777) == 0644 &&
3547 (p->two->mode & 0777) == 0755)
3548 return "mode +x";
3549 else if ((p->one->mode & 0777) == 0755 &&
3550 (p->two->mode & 0777) == 0644)
3551 return "mode -x";
3552 return NULL;
3553 }
3554
3555 static void builtin_diffstat(const char *name_a, const char *name_b,
3556 struct diff_filespec *one,
3557 struct diff_filespec *two,
3558 struct diffstat_t *diffstat,
3559 struct diff_options *o,
3560 struct diff_filepair *p)
3561 {
3562 mmfile_t mf1, mf2;
3563 struct diffstat_file *data;
3564 int same_contents;
3565 int complete_rewrite = 0;
3566
3567 if (!DIFF_PAIR_UNMERGED(p)) {
3568 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3569 complete_rewrite = 1;
3570 }
3571
3572 data = diffstat_add(diffstat, name_a, name_b);
3573 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
3574 if (o->flags.stat_with_summary)
3575 data->comments = get_compact_summary(p, data->is_renamed);
3576
3577 if (!one || !two) {
3578 data->is_unmerged = 1;
3579 return;
3580 }
3581
3582 same_contents = oideq(&one->oid, &two->oid);
3583
3584 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
3585 data->is_binary = 1;
3586 if (same_contents) {
3587 data->added = 0;
3588 data->deleted = 0;
3589 } else {
3590 data->added = diff_filespec_size(two);
3591 data->deleted = diff_filespec_size(one);
3592 }
3593 }
3594
3595 else if (complete_rewrite) {
3596 diff_populate_filespec(one, 0);
3597 diff_populate_filespec(two, 0);
3598 data->deleted = count_lines(one->data, one->size);
3599 data->added = count_lines(two->data, two->size);
3600 }
3601
3602 else if (!same_contents) {
3603 /* Crazy xdl interfaces.. */
3604 xpparam_t xpp;
3605 xdemitconf_t xecfg;
3606
3607 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3608 die("unable to read files to diff");
3609
3610 memset(&xpp, 0, sizeof(xpp));
3611 memset(&xecfg, 0, sizeof(xecfg));
3612 xpp.flags = o->xdl_opts;
3613 xpp.anchors = o->anchors;
3614 xpp.anchors_nr = o->anchors_nr;
3615 xecfg.ctxlen = o->context;
3616 xecfg.interhunkctxlen = o->interhunkcontext;
3617 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
3618 &xpp, &xecfg))
3619 die("unable to generate diffstat for %s", one->path);
3620 }
3621
3622 diff_free_filespec_data(one);
3623 diff_free_filespec_data(two);
3624 }
3625
3626 static void builtin_checkdiff(const char *name_a, const char *name_b,
3627 const char *attr_path,
3628 struct diff_filespec *one,
3629 struct diff_filespec *two,
3630 struct diff_options *o)
3631 {
3632 mmfile_t mf1, mf2;
3633 struct checkdiff_t data;
3634
3635 if (!two)
3636 return;
3637
3638 memset(&data, 0, sizeof(data));
3639 data.filename = name_b ? name_b : name_a;
3640 data.lineno = 0;
3641 data.o = o;
3642 data.ws_rule = whitespace_rule(attr_path);
3643 data.conflict_marker_size = ll_merge_marker_size(attr_path);
3644
3645 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
3646 die("unable to read files to diff");
3647
3648 /*
3649 * All the other codepaths check both sides, but not checking
3650 * the "old" side here is deliberate. We are checking the newly
3651 * introduced changes, and as long as the "new" side is text, we
3652 * can and should check what it introduces.
3653 */
3654 if (diff_filespec_is_binary(two))
3655 goto free_and_return;
3656 else {
3657 /* Crazy xdl interfaces.. */
3658 xpparam_t xpp;
3659 xdemitconf_t xecfg;
3660
3661 memset(&xpp, 0, sizeof(xpp));
3662 memset(&xecfg, 0, sizeof(xecfg));
3663 xecfg.ctxlen = 1; /* at least one context line */
3664 xpp.flags = 0;
3665 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
3666 &xpp, &xecfg))
3667 die("unable to generate checkdiff for %s", one->path);
3668
3669 if (data.ws_rule & WS_BLANK_AT_EOF) {
3670 struct emit_callback ecbdata;
3671 int blank_at_eof;
3672
3673 ecbdata.ws_rule = data.ws_rule;
3674 check_blank_at_eof(&mf1, &mf2, &ecbdata);
3675 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
3676
3677 if (blank_at_eof) {
3678 static char *err;
3679 if (!err)
3680 err = whitespace_error_string(WS_BLANK_AT_EOF);
3681 fprintf(o->file, "%s:%d: %s.\n",
3682 data.filename, blank_at_eof, err);
3683 data.status = 1; /* report errors */
3684 }
3685 }
3686 }
3687 free_and_return:
3688 diff_free_filespec_data(one);
3689 diff_free_filespec_data(two);
3690 if (data.status)
3691 o->flags.check_failed = 1;
3692 }
3693
3694 struct diff_filespec *alloc_filespec(const char *path)
3695 {
3696 struct diff_filespec *spec;
3697
3698 FLEXPTR_ALLOC_STR(spec, path, path);
3699 spec->count = 1;
3700 spec->is_binary = -1;
3701 return spec;
3702 }
3703
3704 void free_filespec(struct diff_filespec *spec)
3705 {
3706 if (!--spec->count) {
3707 diff_free_filespec_data(spec);
3708 free(spec);
3709 }
3710 }
3711
3712 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
3713 int oid_valid, unsigned short mode)
3714 {
3715 if (mode) {
3716 spec->mode = canon_mode(mode);
3717 oidcpy(&spec->oid, oid);
3718 spec->oid_valid = oid_valid;
3719 }
3720 }
3721
3722 /*
3723 * Given a name and sha1 pair, if the index tells us the file in
3724 * the work tree has that object contents, return true, so that
3725 * prepare_temp_file() does not have to inflate and extract.
3726 */
3727 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
3728 {
3729 const struct cache_entry *ce;
3730 struct stat st;
3731 int pos, len;
3732
3733 /*
3734 * We do not read the cache ourselves here, because the
3735 * benchmark with my previous version that always reads cache
3736 * shows that it makes things worse for diff-tree comparing
3737 * two linux-2.6 kernel trees in an already checked out work
3738 * tree. This is because most diff-tree comparisons deal with
3739 * only a small number of files, while reading the cache is
3740 * expensive for a large project, and its cost outweighs the
3741 * savings we get by not inflating the object to a temporary
3742 * file. Practically, this code only helps when we are used
3743 * by diff-cache --cached, which does read the cache before
3744 * calling us.
3745 */
3746 if (!active_cache)
3747 return 0;
3748
3749 /* We want to avoid the working directory if our caller
3750 * doesn't need the data in a normal file, this system
3751 * is rather slow with its stat/open/mmap/close syscalls,
3752 * and the object is contained in a pack file. The pack
3753 * is probably already open and will be faster to obtain
3754 * the data through than the working directory. Loose
3755 * objects however would tend to be slower as they need
3756 * to be individually opened and inflated.
3757 */
3758 if (!FAST_WORKING_DIRECTORY && !want_file && has_object_pack(oid))
3759 return 0;
3760
3761 /*
3762 * Similarly, if we'd have to convert the file contents anyway, that
3763 * makes the optimization not worthwhile.
3764 */
3765 if (!want_file && would_convert_to_git(&the_index, name))
3766 return 0;
3767
3768 len = strlen(name);
3769 pos = cache_name_pos(name, len);
3770 if (pos < 0)
3771 return 0;
3772 ce = active_cache[pos];
3773
3774 /*
3775 * This is not the sha1 we are looking for, or
3776 * unreusable because it is not a regular file.
3777 */
3778 if (!oideq(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
3779 return 0;
3780
3781 /*
3782 * If ce is marked as "assume unchanged", there is no
3783 * guarantee that work tree matches what we are looking for.
3784 */
3785 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
3786 return 0;
3787
3788 /*
3789 * If ce matches the file in the work tree, we can reuse it.
3790 */
3791 if (ce_uptodate(ce) ||
3792 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
3793 return 1;
3794
3795 return 0;
3796 }
3797
3798 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
3799 {
3800 struct strbuf buf = STRBUF_INIT;
3801 char *dirty = "";
3802
3803 /* Are we looking at the work tree? */
3804 if (s->dirty_submodule)
3805 dirty = "-dirty";
3806
3807 strbuf_addf(&buf, "Subproject commit %s%s\n",
3808 oid_to_hex(&s->oid), dirty);
3809 s->size = buf.len;
3810 if (size_only) {
3811 s->data = NULL;
3812 strbuf_release(&buf);
3813 } else {
3814 s->data = strbuf_detach(&buf, NULL);
3815 s->should_free = 1;
3816 }
3817 return 0;
3818 }
3819
3820 /*
3821 * While doing rename detection and pickaxe operation, we may need to
3822 * grab the data for the blob (or file) for our own in-core comparison.
3823 * diff_filespec has data and size fields for this purpose.
3824 */
3825 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
3826 {
3827 int size_only = flags & CHECK_SIZE_ONLY;
3828 int err = 0;
3829 int conv_flags = global_conv_flags_eol;
3830 /*
3831 * demote FAIL to WARN to allow inspecting the situation
3832 * instead of refusing.
3833 */
3834 if (conv_flags & CONV_EOL_RNDTRP_DIE)
3835 conv_flags = CONV_EOL_RNDTRP_WARN;
3836
3837 if (!DIFF_FILE_VALID(s))
3838 die("internal error: asking to populate invalid file.");
3839 if (S_ISDIR(s->mode))
3840 return -1;
3841
3842 if (s->data)
3843 return 0;
3844
3845 if (size_only && 0 < s->size)
3846 return 0;
3847
3848 if (S_ISGITLINK(s->mode))
3849 return diff_populate_gitlink(s, size_only);
3850
3851 if (!s->oid_valid ||
3852 reuse_worktree_file(s->path, &s->oid, 0)) {
3853 struct strbuf buf = STRBUF_INIT;
3854 struct stat st;
3855 int fd;
3856
3857 if (lstat(s->path, &st) < 0) {
3858 err_empty:
3859 err = -1;
3860 empty:
3861 s->data = (char *)"";
3862 s->size = 0;
3863 return err;
3864 }
3865 s->size = xsize_t(st.st_size);
3866 if (!s->size)
3867 goto empty;
3868 if (S_ISLNK(st.st_mode)) {
3869 struct strbuf sb = STRBUF_INIT;
3870
3871 if (strbuf_readlink(&sb, s->path, s->size))
3872 goto err_empty;
3873 s->size = sb.len;
3874 s->data = strbuf_detach(&sb, NULL);
3875 s->should_free = 1;
3876 return 0;
3877 }
3878
3879 /*
3880 * Even if the caller would be happy with getting
3881 * only the size, we cannot return early at this
3882 * point if the path requires us to run the content
3883 * conversion.
3884 */
3885 if (size_only && !would_convert_to_git(&the_index, s->path))
3886 return 0;
3887
3888 /*
3889 * Note: this check uses xsize_t(st.st_size) that may
3890 * not be the true size of the blob after it goes
3891 * through convert_to_git(). This may not strictly be
3892 * correct, but the whole point of big_file_threshold
3893 * and is_binary check being that we want to avoid
3894 * opening the file and inspecting the contents, this
3895 * is probably fine.
3896 */
3897 if ((flags & CHECK_BINARY) &&
3898 s->size > big_file_threshold && s->is_binary == -1) {
3899 s->is_binary = 1;
3900 return 0;
3901 }
3902 fd = open(s->path, O_RDONLY);
3903 if (fd < 0)
3904 goto err_empty;
3905 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3906 close(fd);
3907 s->should_munmap = 1;
3908
3909 /*
3910 * Convert from working tree format to canonical git format
3911 */
3912 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, conv_flags)) {
3913 size_t size = 0;
3914 munmap(s->data, s->size);
3915 s->should_munmap = 0;
3916 s->data = strbuf_detach(&buf, &size);
3917 s->size = size;
3918 s->should_free = 1;
3919 }
3920 }
3921 else {
3922 enum object_type type;
3923 if (size_only || (flags & CHECK_BINARY)) {
3924 type = oid_object_info(the_repository, &s->oid,
3925 &s->size);
3926 if (type < 0)
3927 die("unable to read %s",
3928 oid_to_hex(&s->oid));
3929 if (size_only)
3930 return 0;
3931 if (s->size > big_file_threshold && s->is_binary == -1) {
3932 s->is_binary = 1;
3933 return 0;
3934 }
3935 }
3936 s->data = read_object_file(&s->oid, &type, &s->size);
3937 if (!s->data)
3938 die("unable to read %s", oid_to_hex(&s->oid));
3939 s->should_free = 1;
3940 }
3941 return 0;
3942 }
3943
3944 void diff_free_filespec_blob(struct diff_filespec *s)
3945 {
3946 if (s->should_free)
3947 free(s->data);
3948 else if (s->should_munmap)
3949 munmap(s->data, s->size);
3950
3951 if (s->should_free || s->should_munmap) {
3952 s->should_free = s->should_munmap = 0;
3953 s->data = NULL;
3954 }
3955 }
3956
3957 void diff_free_filespec_data(struct diff_filespec *s)
3958 {
3959 diff_free_filespec_blob(s);
3960 FREE_AND_NULL(s->cnt_data);
3961 }
3962
3963 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3964 void *blob,
3965 unsigned long size,
3966 const struct object_id *oid,
3967 int mode)
3968 {
3969 struct strbuf buf = STRBUF_INIT;
3970 struct strbuf tempfile = STRBUF_INIT;
3971 char *path_dup = xstrdup(path);
3972 const char *base = basename(path_dup);
3973
3974 /* Generate "XXXXXX_basename.ext" */
3975 strbuf_addstr(&tempfile, "XXXXXX_");
3976 strbuf_addstr(&tempfile, base);
3977
3978 temp->tempfile = mks_tempfile_ts(tempfile.buf, strlen(base) + 1);
3979 if (!temp->tempfile)
3980 die_errno("unable to create temp-file");
3981 if (convert_to_working_tree(&the_index, path,
3982 (const char *)blob, (size_t)size, &buf)) {
3983 blob = buf.buf;
3984 size = buf.len;
3985 }
3986 if (write_in_full(temp->tempfile->fd, blob, size) < 0 ||
3987 close_tempfile_gently(temp->tempfile))
3988 die_errno("unable to write temp-file");
3989 temp->name = get_tempfile_path(temp->tempfile);
3990 oid_to_hex_r(temp->hex, oid);
3991 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3992 strbuf_release(&buf);
3993 strbuf_release(&tempfile);
3994 free(path_dup);
3995 }
3996
3997 static struct diff_tempfile *prepare_temp_file(const char *name,
3998 struct diff_filespec *one)
3999 {
4000 struct diff_tempfile *temp = claim_diff_tempfile();
4001
4002 if (!DIFF_FILE_VALID(one)) {
4003 not_a_valid_file:
4004 /* A '-' entry produces this for file-2, and
4005 * a '+' entry produces this for file-1.
4006 */
4007 temp->name = "/dev/null";
4008 xsnprintf(temp->hex, sizeof(temp->hex), ".");
4009 xsnprintf(temp->mode, sizeof(temp->mode), ".");
4010 return temp;
4011 }
4012
4013 if (!S_ISGITLINK(one->mode) &&
4014 (!one->oid_valid ||
4015 reuse_worktree_file(name, &one->oid, 1))) {
4016 struct stat st;
4017 if (lstat(name, &st) < 0) {
4018 if (errno == ENOENT)
4019 goto not_a_valid_file;
4020 die_errno("stat(%s)", name);
4021 }
4022 if (S_ISLNK(st.st_mode)) {
4023 struct strbuf sb = STRBUF_INIT;
4024 if (strbuf_readlink(&sb, name, st.st_size) < 0)
4025 die_errno("readlink(%s)", name);
4026 prep_temp_blob(name, temp, sb.buf, sb.len,
4027 (one->oid_valid ?
4028 &one->oid : &null_oid),
4029 (one->oid_valid ?
4030 one->mode : S_IFLNK));
4031 strbuf_release(&sb);
4032 }
4033 else {
4034 /* we can borrow from the file in the work tree */
4035 temp->name = name;
4036 if (!one->oid_valid)
4037 oid_to_hex_r(temp->hex, &null_oid);
4038 else
4039 oid_to_hex_r(temp->hex, &one->oid);
4040 /* Even though we may sometimes borrow the
4041 * contents from the work tree, we always want
4042 * one->mode. mode is trustworthy even when
4043 * !(one->oid_valid), as long as
4044 * DIFF_FILE_VALID(one).
4045 */
4046 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
4047 }
4048 return temp;
4049 }
4050 else {
4051 if (diff_populate_filespec(one, 0))
4052 die("cannot read data blob for %s", one->path);
4053 prep_temp_blob(name, temp, one->data, one->size,
4054 &one->oid, one->mode);
4055 }
4056 return temp;
4057 }
4058
4059 static void add_external_diff_name(struct argv_array *argv,
4060 const char *name,
4061 struct diff_filespec *df)
4062 {
4063 struct diff_tempfile *temp = prepare_temp_file(name, df);
4064 argv_array_push(argv, temp->name);
4065 argv_array_push(argv, temp->hex);
4066 argv_array_push(argv, temp->mode);
4067 }
4068
4069 /* An external diff command takes:
4070 *
4071 * diff-cmd name infile1 infile1-sha1 infile1-mode \
4072 * infile2 infile2-sha1 infile2-mode [ rename-to ]
4073 *
4074 */
4075 static void run_external_diff(const char *pgm,
4076 const char *name,
4077 const char *other,
4078 struct diff_filespec *one,
4079 struct diff_filespec *two,
4080 const char *xfrm_msg,
4081 int complete_rewrite,
4082 struct diff_options *o)
4083 {
4084 struct argv_array argv = ARGV_ARRAY_INIT;
4085 struct argv_array env = ARGV_ARRAY_INIT;
4086 struct diff_queue_struct *q = &diff_queued_diff;
4087
4088 argv_array_push(&argv, pgm);
4089 argv_array_push(&argv, name);
4090
4091 if (one && two) {
4092 add_external_diff_name(&argv, name, one);
4093 if (!other)
4094 add_external_diff_name(&argv, name, two);
4095 else {
4096 add_external_diff_name(&argv, other, two);
4097 argv_array_push(&argv, other);
4098 argv_array_push(&argv, xfrm_msg);
4099 }
4100 }
4101
4102 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
4103 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
4104
4105 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
4106 die(_("external diff died, stopping at %s"), name);
4107
4108 remove_tempfile();
4109 argv_array_clear(&argv);
4110 argv_array_clear(&env);
4111 }
4112
4113 static int similarity_index(struct diff_filepair *p)
4114 {
4115 return p->score * 100 / MAX_SCORE;
4116 }
4117
4118 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
4119 {
4120 if (startup_info->have_repository)
4121 return find_unique_abbrev(oid, abbrev);
4122 else {
4123 char *hex = oid_to_hex(oid);
4124 if (abbrev < 0)
4125 abbrev = FALLBACK_DEFAULT_ABBREV;
4126 if (abbrev > the_hash_algo->hexsz)
4127 BUG("oid abbreviation out of range: %d", abbrev);
4128 if (abbrev)
4129 hex[abbrev] = '\0';
4130 return hex;
4131 }
4132 }
4133
4134 static void fill_metainfo(struct strbuf *msg,
4135 const char *name,
4136 const char *other,
4137 struct diff_filespec *one,
4138 struct diff_filespec *two,
4139 struct diff_options *o,
4140 struct diff_filepair *p,
4141 int *must_show_header,
4142 int use_color)
4143 {
4144 const char *set = diff_get_color(use_color, DIFF_METAINFO);
4145 const char *reset = diff_get_color(use_color, DIFF_RESET);
4146 const char *line_prefix = diff_line_prefix(o);
4147
4148 *must_show_header = 1;
4149 strbuf_init(msg, PATH_MAX * 2 + 300);
4150 switch (p->status) {
4151 case DIFF_STATUS_COPIED:
4152 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4153 line_prefix, set, similarity_index(p));
4154 strbuf_addf(msg, "%s\n%s%scopy from ",
4155 reset, line_prefix, set);
4156 quote_c_style(name, msg, NULL, 0);
4157 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
4158 quote_c_style(other, msg, NULL, 0);
4159 strbuf_addf(msg, "%s\n", reset);
4160 break;
4161 case DIFF_STATUS_RENAMED:
4162 strbuf_addf(msg, "%s%ssimilarity index %d%%",
4163 line_prefix, set, similarity_index(p));
4164 strbuf_addf(msg, "%s\n%s%srename from ",
4165 reset, line_prefix, set);
4166 quote_c_style(name, msg, NULL, 0);
4167 strbuf_addf(msg, "%s\n%s%srename to ",
4168 reset, line_prefix, set);
4169 quote_c_style(other, msg, NULL, 0);
4170 strbuf_addf(msg, "%s\n", reset);
4171 break;
4172 case DIFF_STATUS_MODIFIED:
4173 if (p->score) {
4174 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
4175 line_prefix,
4176 set, similarity_index(p), reset);
4177 break;
4178 }
4179 /* fallthru */
4180 default:
4181 *must_show_header = 0;
4182 }
4183 if (one && two && !oideq(&one->oid, &two->oid)) {
4184 const unsigned hexsz = the_hash_algo->hexsz;
4185 int abbrev = o->flags.full_index ? hexsz : DEFAULT_ABBREV;
4186
4187 if (o->flags.binary) {
4188 mmfile_t mf;
4189 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
4190 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
4191 abbrev = hexsz;
4192 }
4193 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
4194 diff_abbrev_oid(&one->oid, abbrev),
4195 diff_abbrev_oid(&two->oid, abbrev));
4196 if (one->mode == two->mode)
4197 strbuf_addf(msg, " %06o", one->mode);
4198 strbuf_addf(msg, "%s\n", reset);
4199 }
4200 }
4201
4202 static void run_diff_cmd(const char *pgm,
4203 const char *name,
4204 const char *other,
4205 const char *attr_path,
4206 struct diff_filespec *one,
4207 struct diff_filespec *two,
4208 struct strbuf *msg,
4209 struct diff_options *o,
4210 struct diff_filepair *p)
4211 {
4212 const char *xfrm_msg = NULL;
4213 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
4214 int must_show_header = 0;
4215
4216
4217 if (o->flags.allow_external) {
4218 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
4219 if (drv && drv->external)
4220 pgm = drv->external;
4221 }
4222
4223 if (msg) {
4224 /*
4225 * don't use colors when the header is intended for an
4226 * external diff driver
4227 */
4228 fill_metainfo(msg, name, other, one, two, o, p,
4229 &must_show_header,
4230 want_color(o->use_color) && !pgm);
4231 xfrm_msg = msg->len ? msg->buf : NULL;
4232 }
4233
4234 if (pgm) {
4235 run_external_diff(pgm, name, other, one, two, xfrm_msg,
4236 complete_rewrite, o);
4237 return;
4238 }
4239 if (one && two)
4240 builtin_diff(name, other ? other : name,
4241 one, two, xfrm_msg, must_show_header,
4242 o, complete_rewrite);
4243 else
4244 fprintf(o->file, "* Unmerged path %s\n", name);
4245 }
4246
4247 static void diff_fill_oid_info(struct diff_filespec *one)
4248 {
4249 if (DIFF_FILE_VALID(one)) {
4250 if (!one->oid_valid) {
4251 struct stat st;
4252 if (one->is_stdin) {
4253 oidclr(&one->oid);
4254 return;
4255 }
4256 if (lstat(one->path, &st) < 0)
4257 die_errno("stat '%s'", one->path);
4258 if (index_path(&one->oid, one->path, &st, 0))
4259 die("cannot hash %s", one->path);
4260 }
4261 }
4262 else
4263 oidclr(&one->oid);
4264 }
4265
4266 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
4267 {
4268 /* Strip the prefix but do not molest /dev/null and absolute paths */
4269 if (*namep && **namep != '/') {
4270 *namep += prefix_length;
4271 if (**namep == '/')
4272 ++*namep;
4273 }
4274 if (*otherp && **otherp != '/') {
4275 *otherp += prefix_length;
4276 if (**otherp == '/')
4277 ++*otherp;
4278 }
4279 }
4280
4281 static void run_diff(struct diff_filepair *p, struct diff_options *o)
4282 {
4283 const char *pgm = external_diff();
4284 struct strbuf msg;
4285 struct diff_filespec *one = p->one;
4286 struct diff_filespec *two = p->two;
4287 const char *name;
4288 const char *other;
4289 const char *attr_path;
4290
4291 name = one->path;
4292 other = (strcmp(name, two->path) ? two->path : NULL);
4293 attr_path = name;
4294 if (o->prefix_length)
4295 strip_prefix(o->prefix_length, &name, &other);
4296
4297 if (!o->flags.allow_external)
4298 pgm = NULL;
4299
4300 if (DIFF_PAIR_UNMERGED(p)) {
4301 run_diff_cmd(pgm, name, NULL, attr_path,
4302 NULL, NULL, NULL, o, p);
4303 return;
4304 }
4305
4306 diff_fill_oid_info(one);
4307 diff_fill_oid_info(two);
4308
4309 if (!pgm &&
4310 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
4311 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
4312 /*
4313 * a filepair that changes between file and symlink
4314 * needs to be split into deletion and creation.
4315 */
4316 struct diff_filespec *null = alloc_filespec(two->path);
4317 run_diff_cmd(NULL, name, other, attr_path,
4318 one, null, &msg, o, p);
4319 free(null);
4320 strbuf_release(&msg);
4321
4322 null = alloc_filespec(one->path);
4323 run_diff_cmd(NULL, name, other, attr_path,
4324 null, two, &msg, o, p);
4325 free(null);
4326 }
4327 else
4328 run_diff_cmd(pgm, name, other, attr_path,
4329 one, two, &msg, o, p);
4330
4331 strbuf_release(&msg);
4332 }
4333
4334 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
4335 struct diffstat_t *diffstat)
4336 {
4337 const char *name;
4338 const char *other;
4339
4340 if (DIFF_PAIR_UNMERGED(p)) {
4341 /* unmerged */
4342 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
4343 return;
4344 }
4345
4346 name = p->one->path;
4347 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4348
4349 if (o->prefix_length)
4350 strip_prefix(o->prefix_length, &name, &other);
4351
4352 diff_fill_oid_info(p->one);
4353 diff_fill_oid_info(p->two);
4354
4355 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
4356 }
4357
4358 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
4359 {
4360 const char *name;
4361 const char *other;
4362 const char *attr_path;
4363
4364 if (DIFF_PAIR_UNMERGED(p)) {
4365 /* unmerged */
4366 return;
4367 }
4368
4369 name = p->one->path;
4370 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
4371 attr_path = other ? other : name;
4372
4373 if (o->prefix_length)
4374 strip_prefix(o->prefix_length, &name, &other);
4375
4376 diff_fill_oid_info(p->one);
4377 diff_fill_oid_info(p->two);
4378
4379 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
4380 }
4381
4382 void diff_setup(struct diff_options *options)
4383 {
4384 memcpy(options, &default_diff_options, sizeof(*options));
4385
4386 options->file = stdout;
4387
4388 options->output_indicators[OUTPUT_INDICATOR_NEW] = '+';
4389 options->output_indicators[OUTPUT_INDICATOR_OLD] = '-';
4390 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = ' ';
4391 options->abbrev = DEFAULT_ABBREV;
4392 options->line_termination = '\n';
4393 options->break_opt = -1;
4394 options->rename_limit = -1;
4395 options->dirstat_permille = diff_dirstat_permille_default;
4396 options->context = diff_context_default;
4397 options->interhunkcontext = diff_interhunk_context_default;
4398 options->ws_error_highlight = ws_error_highlight_default;
4399 options->flags.rename_empty = 1;
4400 options->objfind = NULL;
4401
4402 /* pathchange left =NULL by default */
4403 options->change = diff_change;
4404 options->add_remove = diff_addremove;
4405 options->use_color = diff_use_color_default;
4406 options->detect_rename = diff_detect_rename_default;
4407 options->xdl_opts |= diff_algorithm;
4408 if (diff_indent_heuristic)
4409 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4410
4411 options->orderfile = diff_order_file_cfg;
4412
4413 if (diff_no_prefix) {
4414 options->a_prefix = options->b_prefix = "";
4415 } else if (!diff_mnemonic_prefix) {
4416 options->a_prefix = "a/";
4417 options->b_prefix = "b/";
4418 }
4419
4420 options->color_moved = diff_color_moved_default;
4421 options->color_moved_ws_handling = diff_color_moved_ws_default;
4422 }
4423
4424 void diff_setup_done(struct diff_options *options)
4425 {
4426 unsigned check_mask = DIFF_FORMAT_NAME |
4427 DIFF_FORMAT_NAME_STATUS |
4428 DIFF_FORMAT_CHECKDIFF |
4429 DIFF_FORMAT_NO_OUTPUT;
4430 /*
4431 * This must be signed because we're comparing against a potentially
4432 * negative value.
4433 */
4434 const int hexsz = the_hash_algo->hexsz;
4435
4436 if (options->set_default)
4437 options->set_default(options);
4438
4439 if (HAS_MULTI_BITS(options->output_format & check_mask))
4440 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
4441
4442 if (HAS_MULTI_BITS(options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK))
4443 die(_("-G, -S and --find-object are mutually exclusive"));
4444
4445 /*
4446 * Most of the time we can say "there are changes"
4447 * only by checking if there are changed paths, but
4448 * --ignore-whitespace* options force us to look
4449 * inside contents.
4450 */
4451
4452 if ((options->xdl_opts & XDF_WHITESPACE_FLAGS))
4453 options->flags.diff_from_contents = 1;
4454 else
4455 options->flags.diff_from_contents = 0;
4456
4457 if (options->flags.find_copies_harder)
4458 options->detect_rename = DIFF_DETECT_COPY;
4459
4460 if (!options->flags.relative_name)
4461 options->prefix = NULL;
4462 if (options->prefix)
4463 options->prefix_length = strlen(options->prefix);
4464 else
4465 options->prefix_length = 0;
4466
4467 if (options->output_format & (DIFF_FORMAT_NAME |
4468 DIFF_FORMAT_NAME_STATUS |
4469 DIFF_FORMAT_CHECKDIFF |
4470 DIFF_FORMAT_NO_OUTPUT))
4471 options->output_format &= ~(DIFF_FORMAT_RAW |
4472 DIFF_FORMAT_NUMSTAT |
4473 DIFF_FORMAT_DIFFSTAT |
4474 DIFF_FORMAT_SHORTSTAT |
4475 DIFF_FORMAT_DIRSTAT |
4476 DIFF_FORMAT_SUMMARY |
4477 DIFF_FORMAT_PATCH);
4478
4479 /*
4480 * These cases always need recursive; we do not drop caller-supplied
4481 * recursive bits for other formats here.
4482 */
4483 if (options->output_format & (DIFF_FORMAT_PATCH |
4484 DIFF_FORMAT_NUMSTAT |
4485 DIFF_FORMAT_DIFFSTAT |
4486 DIFF_FORMAT_SHORTSTAT |
4487 DIFF_FORMAT_DIRSTAT |
4488 DIFF_FORMAT_SUMMARY |
4489 DIFF_FORMAT_CHECKDIFF))
4490 options->flags.recursive = 1;
4491 /*
4492 * Also pickaxe would not work very well if you do not say recursive
4493 */
4494 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
4495 options->flags.recursive = 1;
4496 /*
4497 * When patches are generated, submodules diffed against the work tree
4498 * must be checked for dirtiness too so it can be shown in the output
4499 */
4500 if (options->output_format & DIFF_FORMAT_PATCH)
4501 options->flags.dirty_submodules = 1;
4502
4503 if (options->detect_rename && options->rename_limit < 0)
4504 options->rename_limit = diff_rename_limit_default;
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 else if (skip_prefix(arg, "--output-indicator-new=", &arg))
4869 options->output_indicators[OUTPUT_INDICATOR_NEW] = arg[0];
4870 else if (skip_prefix(arg, "--output-indicator-old=", &arg))
4871 options->output_indicators[OUTPUT_INDICATOR_OLD] = arg[0];
4872 else if (skip_prefix(arg, "--output-indicator-context=", &arg))
4873 options->output_indicators[OUTPUT_INDICATOR_CONTEXT] = arg[0];
4874
4875 /* renames options */
4876 else if (starts_with(arg, "-B") ||
4877 skip_to_optional_arg(arg, "--break-rewrites", NULL)) {
4878 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4879 return error("invalid argument to -B: %s", arg+2);
4880 }
4881 else if (starts_with(arg, "-M") ||
4882 skip_to_optional_arg(arg, "--find-renames", NULL)) {
4883 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4884 return error("invalid argument to -M: %s", arg+2);
4885 options->detect_rename = DIFF_DETECT_RENAME;
4886 }
4887 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4888 options->irreversible_delete = 1;
4889 }
4890 else if (starts_with(arg, "-C") ||
4891 skip_to_optional_arg(arg, "--find-copies", NULL)) {
4892 if (options->detect_rename == DIFF_DETECT_COPY)
4893 options->flags.find_copies_harder = 1;
4894 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4895 return error("invalid argument to -C: %s", arg+2);
4896 options->detect_rename = DIFF_DETECT_COPY;
4897 }
4898 else if (!strcmp(arg, "--no-renames"))
4899 options->detect_rename = 0;
4900 else if (!strcmp(arg, "--rename-empty"))
4901 options->flags.rename_empty = 1;
4902 else if (!strcmp(arg, "--no-rename-empty"))
4903 options->flags.rename_empty = 0;
4904 else if (skip_to_optional_arg_default(arg, "--relative", &arg, NULL)) {
4905 options->flags.relative_name = 1;
4906 if (arg)
4907 options->prefix = arg;
4908 }
4909
4910 /* xdiff options */
4911 else if (!strcmp(arg, "--minimal"))
4912 DIFF_XDL_SET(options, NEED_MINIMAL);
4913 else if (!strcmp(arg, "--no-minimal"))
4914 DIFF_XDL_CLR(options, NEED_MINIMAL);
4915 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4916 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4917 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4918 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4919 else if (!strcmp(arg, "--ignore-space-at-eol"))
4920 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4921 else if (!strcmp(arg, "--ignore-cr-at-eol"))
4922 DIFF_XDL_SET(options, IGNORE_CR_AT_EOL);
4923 else if (!strcmp(arg, "--ignore-blank-lines"))
4924 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4925 else if (!strcmp(arg, "--indent-heuristic"))
4926 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4927 else if (!strcmp(arg, "--no-indent-heuristic"))
4928 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4929 else if (!strcmp(arg, "--patience")) {
4930 int i;
4931 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4932 /*
4933 * Both --patience and --anchored use PATIENCE_DIFF
4934 * internally, so remove any anchors previously
4935 * specified.
4936 */
4937 for (i = 0; i < options->anchors_nr; i++)
4938 free(options->anchors[i]);
4939 options->anchors_nr = 0;
4940 } else if (!strcmp(arg, "--histogram"))
4941 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4942 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4943 long value = parse_algorithm_value(optarg);
4944 if (value < 0)
4945 return error("option diff-algorithm accepts \"myers\", "
4946 "\"minimal\", \"patience\" and \"histogram\"");
4947 /* clear out previous settings */
4948 DIFF_XDL_CLR(options, NEED_MINIMAL);
4949 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4950 options->xdl_opts |= value;
4951 return argcount;
4952 } else if (skip_prefix(arg, "--anchored=", &arg)) {
4953 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4954 ALLOC_GROW(options->anchors, options->anchors_nr + 1,
4955 options->anchors_alloc);
4956 options->anchors[options->anchors_nr++] = xstrdup(arg);
4957 }
4958
4959 /* flags options */
4960 else if (!strcmp(arg, "--binary")) {
4961 enable_patch_output(&options->output_format);
4962 options->flags.binary = 1;
4963 }
4964 else if (!strcmp(arg, "--full-index"))
4965 options->flags.full_index = 1;
4966 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4967 options->flags.text = 1;
4968 else if (!strcmp(arg, "-R"))
4969 options->flags.reverse_diff = 1;
4970 else if (!strcmp(arg, "--find-copies-harder"))
4971 options->flags.find_copies_harder = 1;
4972 else if (!strcmp(arg, "--follow"))
4973 options->flags.follow_renames = 1;
4974 else if (!strcmp(arg, "--no-follow")) {
4975 options->flags.follow_renames = 0;
4976 options->flags.default_follow_renames = 0;
4977 } else if (skip_to_optional_arg_default(arg, "--color", &arg, "always")) {
4978 int value = git_config_colorbool(NULL, arg);
4979 if (value < 0)
4980 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4981 options->use_color = value;
4982 }
4983 else if (!strcmp(arg, "--no-color"))
4984 options->use_color = 0;
4985 else if (!strcmp(arg, "--color-moved")) {
4986 if (diff_color_moved_default)
4987 options->color_moved = diff_color_moved_default;
4988 if (options->color_moved == COLOR_MOVED_NO)
4989 options->color_moved = COLOR_MOVED_DEFAULT;
4990 } else if (!strcmp(arg, "--no-color-moved"))
4991 options->color_moved = COLOR_MOVED_NO;
4992 else if (skip_prefix(arg, "--color-moved=", &arg)) {
4993 int cm = parse_color_moved(arg);
4994 if (cm < 0)
4995 die("bad --color-moved argument: %s", arg);
4996 options->color_moved = cm;
4997 } else if (skip_prefix(arg, "--color-moved-ws=", &arg)) {
4998 options->color_moved_ws_handling = parse_color_moved_ws(arg);
4999 } else if (skip_to_optional_arg_default(arg, "--color-words", &options->word_regex, NULL)) {
5000 options->use_color = 1;
5001 options->word_diff = DIFF_WORDS_COLOR;
5002 }
5003 else if (!strcmp(arg, "--word-diff")) {
5004 if (options->word_diff == DIFF_WORDS_NONE)
5005 options->word_diff = DIFF_WORDS_PLAIN;
5006 }
5007 else if (skip_prefix(arg, "--word-diff=", &arg)) {
5008 if (!strcmp(arg, "plain"))
5009 options->word_diff = DIFF_WORDS_PLAIN;
5010 else if (!strcmp(arg, "color")) {
5011 options->use_color = 1;
5012 options->word_diff = DIFF_WORDS_COLOR;
5013 }
5014 else if (!strcmp(arg, "porcelain"))
5015 options->word_diff = DIFF_WORDS_PORCELAIN;
5016 else if (!strcmp(arg, "none"))
5017 options->word_diff = DIFF_WORDS_NONE;
5018 else
5019 die("bad --word-diff argument: %s", arg);
5020 }
5021 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
5022 if (options->word_diff == DIFF_WORDS_NONE)
5023 options->word_diff = DIFF_WORDS_PLAIN;
5024 options->word_regex = optarg;
5025 return argcount;
5026 }
5027 else if (!strcmp(arg, "--exit-code"))
5028 options->flags.exit_with_status = 1;
5029 else if (!strcmp(arg, "--quiet"))
5030 options->flags.quick = 1;
5031 else if (!strcmp(arg, "--ext-diff"))
5032 options->flags.allow_external = 1;
5033 else if (!strcmp(arg, "--no-ext-diff"))
5034 options->flags.allow_external = 0;
5035 else if (!strcmp(arg, "--textconv")) {
5036 options->flags.allow_textconv = 1;
5037 options->flags.textconv_set_via_cmdline = 1;
5038 } else if (!strcmp(arg, "--no-textconv"))
5039 options->flags.allow_textconv = 0;
5040 else if (skip_to_optional_arg_default(arg, "--ignore-submodules", &arg, "all")) {
5041 options->flags.override_submodule_config = 1;
5042 handle_ignore_submodules_arg(options, arg);
5043 } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
5044 return parse_submodule_opt(options, arg);
5045 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
5046 return parse_ws_error_highlight_opt(options, arg);
5047 else if (!strcmp(arg, "--ita-invisible-in-index"))
5048 options->ita_invisible_in_index = 1;
5049 else if (!strcmp(arg, "--ita-visible-in-index"))
5050 options->ita_invisible_in_index = 0;
5051
5052 /* misc options */
5053 else if (!strcmp(arg, "-z"))
5054 options->line_termination = 0;
5055 else if ((argcount = short_opt('l', av, &optarg))) {
5056 options->rename_limit = strtoul(optarg, NULL, 10);
5057 return argcount;
5058 }
5059 else if ((argcount = short_opt('S', av, &optarg))) {
5060 options->pickaxe = optarg;
5061 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
5062 return argcount;
5063 } else if ((argcount = short_opt('G', av, &optarg))) {
5064 options->pickaxe = optarg;
5065 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
5066 return argcount;
5067 }
5068 else if (!strcmp(arg, "--pickaxe-all"))
5069 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
5070 else if (!strcmp(arg, "--pickaxe-regex"))
5071 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
5072 else if ((argcount = short_opt('O', av, &optarg))) {
5073 options->orderfile = prefix_filename(prefix, optarg);
5074 return argcount;
5075 } else if (skip_prefix(arg, "--find-object=", &arg))
5076 return parse_objfind_opt(options, arg);
5077 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
5078 int offending = parse_diff_filter_opt(optarg, options);
5079 if (offending)
5080 die("unknown change class '%c' in --diff-filter=%s",
5081 offending, optarg);
5082 return argcount;
5083 }
5084 else if (!strcmp(arg, "--no-abbrev"))
5085 options->abbrev = 0;
5086 else if (!strcmp(arg, "--abbrev"))
5087 options->abbrev = DEFAULT_ABBREV;
5088 else if (skip_prefix(arg, "--abbrev=", &arg)) {
5089 options->abbrev = strtoul(arg, NULL, 10);
5090 if (options->abbrev < MINIMUM_ABBREV)
5091 options->abbrev = MINIMUM_ABBREV;
5092 else if (the_hash_algo->hexsz < options->abbrev)
5093 options->abbrev = the_hash_algo->hexsz;
5094 }
5095 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
5096 options->a_prefix = optarg;
5097 return argcount;
5098 }
5099 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
5100 options->line_prefix = optarg;
5101 options->line_prefix_length = strlen(options->line_prefix);
5102 graph_setup_line_prefix(options);
5103 return argcount;
5104 }
5105 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
5106 options->b_prefix = optarg;
5107 return argcount;
5108 }
5109 else if (!strcmp(arg, "--no-prefix"))
5110 options->a_prefix = options->b_prefix = "";
5111 else if (opt_arg(arg, '\0', "inter-hunk-context",
5112 &options->interhunkcontext))
5113 ;
5114 else if (!strcmp(arg, "-W"))
5115 options->flags.funccontext = 1;
5116 else if (!strcmp(arg, "--function-context"))
5117 options->flags.funccontext = 1;
5118 else if (!strcmp(arg, "--no-function-context"))
5119 options->flags.funccontext = 0;
5120 else if ((argcount = parse_long_opt("output", av, &optarg))) {
5121 char *path = prefix_filename(prefix, optarg);
5122 options->file = xfopen(path, "w");
5123 options->close_file = 1;
5124 if (options->use_color != GIT_COLOR_ALWAYS)
5125 options->use_color = GIT_COLOR_NEVER;
5126 free(path);
5127 return argcount;
5128 } else
5129 return 0;
5130 return 1;
5131 }
5132
5133 int parse_rename_score(const char **cp_p)
5134 {
5135 unsigned long num, scale;
5136 int ch, dot;
5137 const char *cp = *cp_p;
5138
5139 num = 0;
5140 scale = 1;
5141 dot = 0;
5142 for (;;) {
5143 ch = *cp;
5144 if ( !dot && ch == '.' ) {
5145 scale = 1;
5146 dot = 1;
5147 } else if ( ch == '%' ) {
5148 scale = dot ? scale*100 : 100;
5149 cp++; /* % is always at the end */
5150 break;
5151 } else if ( ch >= '0' && ch <= '9' ) {
5152 if ( scale < 100000 ) {
5153 scale *= 10;
5154 num = (num*10) + (ch-'0');
5155 }
5156 } else {
5157 break;
5158 }
5159 cp++;
5160 }
5161 *cp_p = cp;
5162
5163 /* user says num divided by scale and we say internally that
5164 * is MAX_SCORE * num / scale.
5165 */
5166 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
5167 }
5168
5169 static int diff_scoreopt_parse(const char *opt)
5170 {
5171 int opt1, opt2, cmd;
5172
5173 if (*opt++ != '-')
5174 return -1;
5175 cmd = *opt++;
5176 if (cmd == '-') {
5177 /* convert the long-form arguments into short-form versions */
5178 if (skip_prefix(opt, "break-rewrites", &opt)) {
5179 if (*opt == 0 || *opt++ == '=')
5180 cmd = 'B';
5181 } else if (skip_prefix(opt, "find-copies", &opt)) {
5182 if (*opt == 0 || *opt++ == '=')
5183 cmd = 'C';
5184 } else if (skip_prefix(opt, "find-renames", &opt)) {
5185 if (*opt == 0 || *opt++ == '=')
5186 cmd = 'M';
5187 }
5188 }
5189 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
5190 return -1; /* that is not a -M, -C, or -B option */
5191
5192 opt1 = parse_rename_score(&opt);
5193 if (cmd != 'B')
5194 opt2 = 0;
5195 else {
5196 if (*opt == 0)
5197 opt2 = 0;
5198 else if (*opt != '/')
5199 return -1; /* we expect -B80/99 or -B80 */
5200 else {
5201 opt++;
5202 opt2 = parse_rename_score(&opt);
5203 }
5204 }
5205 if (*opt != 0)
5206 return -1;
5207 return opt1 | (opt2 << 16);
5208 }
5209
5210 struct diff_queue_struct diff_queued_diff;
5211
5212 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5213 {
5214 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
5215 queue->queue[queue->nr++] = dp;
5216 }
5217
5218 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
5219 struct diff_filespec *one,
5220 struct diff_filespec *two)
5221 {
5222 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
5223 dp->one = one;
5224 dp->two = two;
5225 if (queue)
5226 diff_q(queue, dp);
5227 return dp;
5228 }
5229
5230 void diff_free_filepair(struct diff_filepair *p)
5231 {
5232 free_filespec(p->one);
5233 free_filespec(p->two);
5234 free(p);
5235 }
5236
5237 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
5238 {
5239 int abblen;
5240 const char *abbrev;
5241
5242 /* Do we want all 40 hex characters? */
5243 if (len == the_hash_algo->hexsz)
5244 return oid_to_hex(oid);
5245
5246 /* An abbreviated value is fine, possibly followed by an ellipsis. */
5247 abbrev = diff_abbrev_oid(oid, len);
5248
5249 if (!print_sha1_ellipsis())
5250 return abbrev;
5251
5252 abblen = strlen(abbrev);
5253
5254 /*
5255 * In well-behaved cases, where the abbreviated result is the
5256 * same as the requested length, append three dots after the
5257 * abbreviation (hence the whole logic is limited to the case
5258 * where abblen < 37); when the actual abbreviated result is a
5259 * bit longer than the requested length, we reduce the number
5260 * of dots so that they match the well-behaved ones. However,
5261 * if the actual abbreviation is longer than the requested
5262 * length by more than three, we give up on aligning, and add
5263 * three dots anyway, to indicate that the output is not the
5264 * full object name. Yes, this may be suboptimal, but this
5265 * appears only in "diff --raw --abbrev" output and it is not
5266 * worth the effort to change it now. Note that this would
5267 * likely to work fine when the automatic sizing of default
5268 * abbreviation length is used--we would be fed -1 in "len" in
5269 * that case, and will end up always appending three-dots, but
5270 * the automatic sizing is supposed to give abblen that ensures
5271 * uniqueness across all objects (statistically speaking).
5272 */
5273 if (abblen < the_hash_algo->hexsz - 3) {
5274 static char hex[GIT_MAX_HEXSZ + 1];
5275 if (len < abblen && abblen <= len + 2)
5276 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
5277 else
5278 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
5279 return hex;
5280 }
5281
5282 return oid_to_hex(oid);
5283 }
5284
5285 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
5286 {
5287 int line_termination = opt->line_termination;
5288 int inter_name_termination = line_termination ? '\t' : '\0';
5289
5290 fprintf(opt->file, "%s", diff_line_prefix(opt));
5291 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
5292 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
5293 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
5294 fprintf(opt->file, "%s ",
5295 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
5296 }
5297 if (p->score) {
5298 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
5299 inter_name_termination);
5300 } else {
5301 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
5302 }
5303
5304 if (p->status == DIFF_STATUS_COPIED ||
5305 p->status == DIFF_STATUS_RENAMED) {
5306 const char *name_a, *name_b;
5307 name_a = p->one->path;
5308 name_b = p->two->path;
5309 strip_prefix(opt->prefix_length, &name_a, &name_b);
5310 write_name_quoted(name_a, opt->file, inter_name_termination);
5311 write_name_quoted(name_b, opt->file, line_termination);
5312 } else {
5313 const char *name_a, *name_b;
5314 name_a = p->one->mode ? p->one->path : p->two->path;
5315 name_b = NULL;
5316 strip_prefix(opt->prefix_length, &name_a, &name_b);
5317 write_name_quoted(name_a, opt->file, line_termination);
5318 }
5319 }
5320
5321 int diff_unmodified_pair(struct diff_filepair *p)
5322 {
5323 /* This function is written stricter than necessary to support
5324 * the currently implemented transformers, but the idea is to
5325 * let transformers to produce diff_filepairs any way they want,
5326 * and filter and clean them up here before producing the output.
5327 */
5328 struct diff_filespec *one = p->one, *two = p->two;
5329
5330 if (DIFF_PAIR_UNMERGED(p))
5331 return 0; /* unmerged is interesting */
5332
5333 /* deletion, addition, mode or type change
5334 * and rename are all interesting.
5335 */
5336 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
5337 DIFF_PAIR_MODE_CHANGED(p) ||
5338 strcmp(one->path, two->path))
5339 return 0;
5340
5341 /* both are valid and point at the same path. that is, we are
5342 * dealing with a change.
5343 */
5344 if (one->oid_valid && two->oid_valid &&
5345 oideq(&one->oid, &two->oid) &&
5346 !one->dirty_submodule && !two->dirty_submodule)
5347 return 1; /* no change */
5348 if (!one->oid_valid && !two->oid_valid)
5349 return 1; /* both look at the same file on the filesystem. */
5350 return 0;
5351 }
5352
5353 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
5354 {
5355 if (diff_unmodified_pair(p))
5356 return;
5357
5358 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5359 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5360 return; /* no tree diffs in patch format */
5361
5362 run_diff(p, o);
5363 }
5364
5365 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
5366 struct diffstat_t *diffstat)
5367 {
5368 if (diff_unmodified_pair(p))
5369 return;
5370
5371 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5372 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5373 return; /* no useful stat for tree diffs */
5374
5375 run_diffstat(p, o, diffstat);
5376 }
5377
5378 static void diff_flush_checkdiff(struct diff_filepair *p,
5379 struct diff_options *o)
5380 {
5381 if (diff_unmodified_pair(p))
5382 return;
5383
5384 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5385 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5386 return; /* nothing to check in tree diffs */
5387
5388 run_checkdiff(p, o);
5389 }
5390
5391 int diff_queue_is_empty(void)
5392 {
5393 struct diff_queue_struct *q = &diff_queued_diff;
5394 int i;
5395 for (i = 0; i < q->nr; i++)
5396 if (!diff_unmodified_pair(q->queue[i]))
5397 return 0;
5398 return 1;
5399 }
5400
5401 #if DIFF_DEBUG
5402 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
5403 {
5404 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
5405 x, one ? one : "",
5406 s->path,
5407 DIFF_FILE_VALID(s) ? "valid" : "invalid",
5408 s->mode,
5409 s->oid_valid ? oid_to_hex(&s->oid) : "");
5410 fprintf(stderr, "queue[%d] %s size %lu\n",
5411 x, one ? one : "",
5412 s->size);
5413 }
5414
5415 void diff_debug_filepair(const struct diff_filepair *p, int i)
5416 {
5417 diff_debug_filespec(p->one, i, "one");
5418 diff_debug_filespec(p->two, i, "two");
5419 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
5420 p->score, p->status ? p->status : '?',
5421 p->one->rename_used, p->broken_pair);
5422 }
5423
5424 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
5425 {
5426 int i;
5427 if (msg)
5428 fprintf(stderr, "%s\n", msg);
5429 fprintf(stderr, "q->nr = %d\n", q->nr);
5430 for (i = 0; i < q->nr; i++) {
5431 struct diff_filepair *p = q->queue[i];
5432 diff_debug_filepair(p, i);
5433 }
5434 }
5435 #endif
5436
5437 static void diff_resolve_rename_copy(void)
5438 {
5439 int i;
5440 struct diff_filepair *p;
5441 struct diff_queue_struct *q = &diff_queued_diff;
5442
5443 diff_debug_queue("resolve-rename-copy", q);
5444
5445 for (i = 0; i < q->nr; i++) {
5446 p = q->queue[i];
5447 p->status = 0; /* undecided */
5448 if (DIFF_PAIR_UNMERGED(p))
5449 p->status = DIFF_STATUS_UNMERGED;
5450 else if (!DIFF_FILE_VALID(p->one))
5451 p->status = DIFF_STATUS_ADDED;
5452 else if (!DIFF_FILE_VALID(p->two))
5453 p->status = DIFF_STATUS_DELETED;
5454 else if (DIFF_PAIR_TYPE_CHANGED(p))
5455 p->status = DIFF_STATUS_TYPE_CHANGED;
5456
5457 /* from this point on, we are dealing with a pair
5458 * whose both sides are valid and of the same type, i.e.
5459 * either in-place edit or rename/copy edit.
5460 */
5461 else if (DIFF_PAIR_RENAME(p)) {
5462 /*
5463 * A rename might have re-connected a broken
5464 * pair up, causing the pathnames to be the
5465 * same again. If so, that's not a rename at
5466 * all, just a modification..
5467 *
5468 * Otherwise, see if this source was used for
5469 * multiple renames, in which case we decrement
5470 * the count, and call it a copy.
5471 */
5472 if (!strcmp(p->one->path, p->two->path))
5473 p->status = DIFF_STATUS_MODIFIED;
5474 else if (--p->one->rename_used > 0)
5475 p->status = DIFF_STATUS_COPIED;
5476 else
5477 p->status = DIFF_STATUS_RENAMED;
5478 }
5479 else if (!oideq(&p->one->oid, &p->two->oid) ||
5480 p->one->mode != p->two->mode ||
5481 p->one->dirty_submodule ||
5482 p->two->dirty_submodule ||
5483 is_null_oid(&p->one->oid))
5484 p->status = DIFF_STATUS_MODIFIED;
5485 else {
5486 /* This is a "no-change" entry and should not
5487 * happen anymore, but prepare for broken callers.
5488 */
5489 error("feeding unmodified %s to diffcore",
5490 p->one->path);
5491 p->status = DIFF_STATUS_UNKNOWN;
5492 }
5493 }
5494 diff_debug_queue("resolve-rename-copy done", q);
5495 }
5496
5497 static int check_pair_status(struct diff_filepair *p)
5498 {
5499 switch (p->status) {
5500 case DIFF_STATUS_UNKNOWN:
5501 return 0;
5502 case 0:
5503 die("internal error in diff-resolve-rename-copy");
5504 default:
5505 return 1;
5506 }
5507 }
5508
5509 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
5510 {
5511 int fmt = opt->output_format;
5512
5513 if (fmt & DIFF_FORMAT_CHECKDIFF)
5514 diff_flush_checkdiff(p, opt);
5515 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
5516 diff_flush_raw(p, opt);
5517 else if (fmt & DIFF_FORMAT_NAME) {
5518 const char *name_a, *name_b;
5519 name_a = p->two->path;
5520 name_b = NULL;
5521 strip_prefix(opt->prefix_length, &name_a, &name_b);
5522 fprintf(opt->file, "%s", diff_line_prefix(opt));
5523 write_name_quoted(name_a, opt->file, opt->line_termination);
5524 }
5525 }
5526
5527 static void show_file_mode_name(struct diff_options *opt, const char *newdelete, struct diff_filespec *fs)
5528 {
5529 struct strbuf sb = STRBUF_INIT;
5530 if (fs->mode)
5531 strbuf_addf(&sb, " %s mode %06o ", newdelete, fs->mode);
5532 else
5533 strbuf_addf(&sb, " %s ", newdelete);
5534
5535 quote_c_style(fs->path, &sb, NULL, 0);
5536 strbuf_addch(&sb, '\n');
5537 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5538 sb.buf, sb.len, 0);
5539 strbuf_release(&sb);
5540 }
5541
5542 static void show_mode_change(struct diff_options *opt, struct diff_filepair *p,
5543 int show_name)
5544 {
5545 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
5546 struct strbuf sb = STRBUF_INIT;
5547 strbuf_addf(&sb, " mode change %06o => %06o",
5548 p->one->mode, p->two->mode);
5549 if (show_name) {
5550 strbuf_addch(&sb, ' ');
5551 quote_c_style(p->two->path, &sb, NULL, 0);
5552 }
5553 strbuf_addch(&sb, '\n');
5554 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5555 sb.buf, sb.len, 0);
5556 strbuf_release(&sb);
5557 }
5558 }
5559
5560 static void show_rename_copy(struct diff_options *opt, const char *renamecopy,
5561 struct diff_filepair *p)
5562 {
5563 struct strbuf sb = STRBUF_INIT;
5564 struct strbuf names = STRBUF_INIT;
5565
5566 pprint_rename(&names, p->one->path, p->two->path);
5567 strbuf_addf(&sb, " %s %s (%d%%)\n",
5568 renamecopy, names.buf, similarity_index(p));
5569 strbuf_release(&names);
5570 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5571 sb.buf, sb.len, 0);
5572 show_mode_change(opt, p, 0);
5573 strbuf_release(&sb);
5574 }
5575
5576 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
5577 {
5578 switch(p->status) {
5579 case DIFF_STATUS_DELETED:
5580 show_file_mode_name(opt, "delete", p->one);
5581 break;
5582 case DIFF_STATUS_ADDED:
5583 show_file_mode_name(opt, "create", p->two);
5584 break;
5585 case DIFF_STATUS_COPIED:
5586 show_rename_copy(opt, "copy", p);
5587 break;
5588 case DIFF_STATUS_RENAMED:
5589 show_rename_copy(opt, "rename", p);
5590 break;
5591 default:
5592 if (p->score) {
5593 struct strbuf sb = STRBUF_INIT;
5594 strbuf_addstr(&sb, " rewrite ");
5595 quote_c_style(p->two->path, &sb, NULL, 0);
5596 strbuf_addf(&sb, " (%d%%)\n", similarity_index(p));
5597 emit_diff_symbol(opt, DIFF_SYMBOL_SUMMARY,
5598 sb.buf, sb.len, 0);
5599 strbuf_release(&sb);
5600 }
5601 show_mode_change(opt, p, !p->score);
5602 break;
5603 }
5604 }
5605
5606 struct patch_id_t {
5607 git_SHA_CTX *ctx;
5608 int patchlen;
5609 };
5610
5611 static int remove_space(char *line, int len)
5612 {
5613 int i;
5614 char *dst = line;
5615 unsigned char c;
5616
5617 for (i = 0; i < len; i++)
5618 if (!isspace((c = line[i])))
5619 *dst++ = c;
5620
5621 return dst - line;
5622 }
5623
5624 static void patch_id_consume(void *priv, char *line, unsigned long len)
5625 {
5626 struct patch_id_t *data = priv;
5627 int new_len;
5628
5629 /* Ignore line numbers when computing the SHA1 of the patch */
5630 if (starts_with(line, "@@ -"))
5631 return;
5632
5633 new_len = remove_space(line, len);
5634
5635 git_SHA1_Update(data->ctx, line, new_len);
5636 data->patchlen += new_len;
5637 }
5638
5639 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
5640 {
5641 git_SHA1_Update(ctx, str, strlen(str));
5642 }
5643
5644 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
5645 {
5646 /* large enough for 2^32 in octal */
5647 char buf[12];
5648 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
5649 git_SHA1_Update(ctx, buf, len);
5650 }
5651
5652 /* returns 0 upon success, and writes result into sha1 */
5653 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5654 {
5655 struct diff_queue_struct *q = &diff_queued_diff;
5656 int i;
5657 git_SHA_CTX ctx;
5658 struct patch_id_t data;
5659
5660 git_SHA1_Init(&ctx);
5661 memset(&data, 0, sizeof(struct patch_id_t));
5662 data.ctx = &ctx;
5663
5664 for (i = 0; i < q->nr; i++) {
5665 xpparam_t xpp;
5666 xdemitconf_t xecfg;
5667 mmfile_t mf1, mf2;
5668 struct diff_filepair *p = q->queue[i];
5669 int len1, len2;
5670
5671 memset(&xpp, 0, sizeof(xpp));
5672 memset(&xecfg, 0, sizeof(xecfg));
5673 if (p->status == 0)
5674 return error("internal diff status error");
5675 if (p->status == DIFF_STATUS_UNKNOWN)
5676 continue;
5677 if (diff_unmodified_pair(p))
5678 continue;
5679 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
5680 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
5681 continue;
5682 if (DIFF_PAIR_UNMERGED(p))
5683 continue;
5684
5685 diff_fill_oid_info(p->one);
5686 diff_fill_oid_info(p->two);
5687
5688 len1 = remove_space(p->one->path, strlen(p->one->path));
5689 len2 = remove_space(p->two->path, strlen(p->two->path));
5690 patch_id_add_string(&ctx, "diff--git");
5691 patch_id_add_string(&ctx, "a/");
5692 git_SHA1_Update(&ctx, p->one->path, len1);
5693 patch_id_add_string(&ctx, "b/");
5694 git_SHA1_Update(&ctx, p->two->path, len2);
5695
5696 if (p->one->mode == 0) {
5697 patch_id_add_string(&ctx, "newfilemode");
5698 patch_id_add_mode(&ctx, p->two->mode);
5699 patch_id_add_string(&ctx, "---/dev/null");
5700 patch_id_add_string(&ctx, "+++b/");
5701 git_SHA1_Update(&ctx, p->two->path, len2);
5702 } else if (p->two->mode == 0) {
5703 patch_id_add_string(&ctx, "deletedfilemode");
5704 patch_id_add_mode(&ctx, p->one->mode);
5705 patch_id_add_string(&ctx, "---a/");
5706 git_SHA1_Update(&ctx, p->one->path, len1);
5707 patch_id_add_string(&ctx, "+++/dev/null");
5708 } else {
5709 patch_id_add_string(&ctx, "---a/");
5710 git_SHA1_Update(&ctx, p->one->path, len1);
5711 patch_id_add_string(&ctx, "+++b/");
5712 git_SHA1_Update(&ctx, p->two->path, len2);
5713 }
5714
5715 if (diff_header_only)
5716 continue;
5717
5718 if (fill_mmfile(&mf1, p->one) < 0 ||
5719 fill_mmfile(&mf2, p->two) < 0)
5720 return error("unable to read files to diff");
5721
5722 if (diff_filespec_is_binary(p->one) ||
5723 diff_filespec_is_binary(p->two)) {
5724 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
5725 GIT_SHA1_HEXSZ);
5726 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
5727 GIT_SHA1_HEXSZ);
5728 continue;
5729 }
5730
5731 xpp.flags = 0;
5732 xecfg.ctxlen = 3;
5733 xecfg.flags = 0;
5734 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
5735 &xpp, &xecfg))
5736 return error("unable to generate patch-id diff for %s",
5737 p->one->path);
5738 }
5739
5740 git_SHA1_Final(oid->hash, &ctx);
5741 return 0;
5742 }
5743
5744 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
5745 {
5746 struct diff_queue_struct *q = &diff_queued_diff;
5747 int i;
5748 int result = diff_get_patch_id(options, oid, diff_header_only);
5749
5750 for (i = 0; i < q->nr; i++)
5751 diff_free_filepair(q->queue[i]);
5752
5753 free(q->queue);
5754 DIFF_QUEUE_CLEAR(q);
5755
5756 return result;
5757 }
5758
5759 static int is_summary_empty(const struct diff_queue_struct *q)
5760 {
5761 int i;
5762
5763 for (i = 0; i < q->nr; i++) {
5764 const struct diff_filepair *p = q->queue[i];
5765
5766 switch (p->status) {
5767 case DIFF_STATUS_DELETED:
5768 case DIFF_STATUS_ADDED:
5769 case DIFF_STATUS_COPIED:
5770 case DIFF_STATUS_RENAMED:
5771 return 0;
5772 default:
5773 if (p->score)
5774 return 0;
5775 if (p->one->mode && p->two->mode &&
5776 p->one->mode != p->two->mode)
5777 return 0;
5778 break;
5779 }
5780 }
5781 return 1;
5782 }
5783
5784 static const char rename_limit_warning[] =
5785 N_("inexact rename detection was skipped due to too many files.");
5786
5787 static const char degrade_cc_to_c_warning[] =
5788 N_("only found copies from modified paths due to too many files.");
5789
5790 static const char rename_limit_advice[] =
5791 N_("you may want to set your %s variable to at least "
5792 "%d and retry the command.");
5793
5794 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
5795 {
5796 fflush(stdout);
5797 if (degraded_cc)
5798 warning(_(degrade_cc_to_c_warning));
5799 else if (needed)
5800 warning(_(rename_limit_warning));
5801 else
5802 return;
5803 if (0 < needed)
5804 warning(_(rename_limit_advice), varname, needed);
5805 }
5806
5807 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
5808 {
5809 int i;
5810 static struct emitted_diff_symbols esm = EMITTED_DIFF_SYMBOLS_INIT;
5811 struct diff_queue_struct *q = &diff_queued_diff;
5812
5813 if (WSEH_NEW & WS_RULE_MASK)
5814 BUG("WS rules bit mask overlaps with diff symbol flags");
5815
5816 if (o->color_moved)
5817 o->emitted_symbols = &esm;
5818
5819 for (i = 0; i < q->nr; i++) {
5820 struct diff_filepair *p = q->queue[i];
5821 if (check_pair_status(p))
5822 diff_flush_patch(p, o);
5823 }
5824
5825 if (o->emitted_symbols) {
5826 if (o->color_moved) {
5827 struct hashmap add_lines, del_lines;
5828
5829 if (o->color_moved_ws_handling &
5830 COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE)
5831 o->color_moved_ws_handling |= XDF_IGNORE_WHITESPACE;
5832
5833 hashmap_init(&del_lines, moved_entry_cmp, o, 0);
5834 hashmap_init(&add_lines, moved_entry_cmp, o, 0);
5835
5836 add_lines_to_move_detection(o, &add_lines, &del_lines);
5837 mark_color_as_moved(o, &add_lines, &del_lines);
5838 if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
5839 dim_moved_lines(o);
5840
5841 hashmap_free(&add_lines, 0);
5842 hashmap_free(&del_lines, 0);
5843 }
5844
5845 for (i = 0; i < esm.nr; i++)
5846 emit_diff_symbol_from_struct(o, &esm.buf[i]);
5847
5848 for (i = 0; i < esm.nr; i++)
5849 free((void *)esm.buf[i].line);
5850 }
5851 esm.nr = 0;
5852 }
5853
5854 void diff_flush(struct diff_options *options)
5855 {
5856 struct diff_queue_struct *q = &diff_queued_diff;
5857 int i, output_format = options->output_format;
5858 int separator = 0;
5859 int dirstat_by_line = 0;
5860
5861 /*
5862 * Order: raw, stat, summary, patch
5863 * or: name/name-status/checkdiff (other bits clear)
5864 */
5865 if (!q->nr)
5866 goto free_queue;
5867
5868 if (output_format & (DIFF_FORMAT_RAW |
5869 DIFF_FORMAT_NAME |
5870 DIFF_FORMAT_NAME_STATUS |
5871 DIFF_FORMAT_CHECKDIFF)) {
5872 for (i = 0; i < q->nr; i++) {
5873 struct diff_filepair *p = q->queue[i];
5874 if (check_pair_status(p))
5875 flush_one_pair(p, options);
5876 }
5877 separator++;
5878 }
5879
5880 if (output_format & DIFF_FORMAT_DIRSTAT && options->flags.dirstat_by_line)
5881 dirstat_by_line = 1;
5882
5883 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
5884 dirstat_by_line) {
5885 struct diffstat_t diffstat;
5886
5887 memset(&diffstat, 0, sizeof(struct diffstat_t));
5888 for (i = 0; i < q->nr; i++) {
5889 struct diff_filepair *p = q->queue[i];
5890 if (check_pair_status(p))
5891 diff_flush_stat(p, options, &diffstat);
5892 }
5893 if (output_format & DIFF_FORMAT_NUMSTAT)
5894 show_numstat(&diffstat, options);
5895 if (output_format & DIFF_FORMAT_DIFFSTAT)
5896 show_stats(&diffstat, options);
5897 if (output_format & DIFF_FORMAT_SHORTSTAT)
5898 show_shortstats(&diffstat, options);
5899 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
5900 show_dirstat_by_line(&diffstat, options);
5901 free_diffstat_info(&diffstat);
5902 separator++;
5903 }
5904 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
5905 show_dirstat(options);
5906
5907 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
5908 for (i = 0; i < q->nr; i++) {
5909 diff_summary(options, q->queue[i]);
5910 }
5911 separator++;
5912 }
5913
5914 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
5915 options->flags.exit_with_status &&
5916 options->flags.diff_from_contents) {
5917 /*
5918 * run diff_flush_patch for the exit status. setting
5919 * options->file to /dev/null should be safe, because we
5920 * aren't supposed to produce any output anyway.
5921 */
5922 if (options->close_file)
5923 fclose(options->file);
5924 options->file = xfopen("/dev/null", "w");
5925 options->close_file = 1;
5926 options->color_moved = 0;
5927 for (i = 0; i < q->nr; i++) {
5928 struct diff_filepair *p = q->queue[i];
5929 if (check_pair_status(p))
5930 diff_flush_patch(p, options);
5931 if (options->found_changes)
5932 break;
5933 }
5934 }
5935
5936 if (output_format & DIFF_FORMAT_PATCH) {
5937 if (separator) {
5938 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5939 if (options->stat_sep)
5940 /* attach patch instead of inline */
5941 emit_diff_symbol(options, DIFF_SYMBOL_STAT_SEP,
5942 NULL, 0, 0);
5943 }
5944
5945 diff_flush_patch_all_file_pairs(options);
5946 }
5947
5948 if (output_format & DIFF_FORMAT_CALLBACK)
5949 options->format_callback(q, options, options->format_callback_data);
5950
5951 for (i = 0; i < q->nr; i++)
5952 diff_free_filepair(q->queue[i]);
5953 free_queue:
5954 free(q->queue);
5955 DIFF_QUEUE_CLEAR(q);
5956 if (options->close_file)
5957 fclose(options->file);
5958
5959 /*
5960 * Report the content-level differences with HAS_CHANGES;
5961 * diff_addremove/diff_change does not set the bit when
5962 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5963 */
5964 if (options->flags.diff_from_contents) {
5965 if (options->found_changes)
5966 options->flags.has_changes = 1;
5967 else
5968 options->flags.has_changes = 0;
5969 }
5970 }
5971
5972 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5973 {
5974 return (((p->status == DIFF_STATUS_MODIFIED) &&
5975 ((p->score &&
5976 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5977 (!p->score &&
5978 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5979 ((p->status != DIFF_STATUS_MODIFIED) &&
5980 filter_bit_tst(p->status, options)));
5981 }
5982
5983 static void diffcore_apply_filter(struct diff_options *options)
5984 {
5985 int i;
5986 struct diff_queue_struct *q = &diff_queued_diff;
5987 struct diff_queue_struct outq;
5988
5989 DIFF_QUEUE_CLEAR(&outq);
5990
5991 if (!options->filter)
5992 return;
5993
5994 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5995 int found;
5996 for (i = found = 0; !found && i < q->nr; i++) {
5997 if (match_filter(options, q->queue[i]))
5998 found++;
5999 }
6000 if (found)
6001 return;
6002
6003 /* otherwise we will clear the whole queue
6004 * by copying the empty outq at the end of this
6005 * function, but first clear the current entries
6006 * in the queue.
6007 */
6008 for (i = 0; i < q->nr; i++)
6009 diff_free_filepair(q->queue[i]);
6010 }
6011 else {
6012 /* Only the matching ones */
6013 for (i = 0; i < q->nr; i++) {
6014 struct diff_filepair *p = q->queue[i];
6015 if (match_filter(options, p))
6016 diff_q(&outq, p);
6017 else
6018 diff_free_filepair(p);
6019 }
6020 }
6021 free(q->queue);
6022 *q = outq;
6023 }
6024
6025 /* Check whether two filespecs with the same mode and size are identical */
6026 static int diff_filespec_is_identical(struct diff_filespec *one,
6027 struct diff_filespec *two)
6028 {
6029 if (S_ISGITLINK(one->mode))
6030 return 0;
6031 if (diff_populate_filespec(one, 0))
6032 return 0;
6033 if (diff_populate_filespec(two, 0))
6034 return 0;
6035 return !memcmp(one->data, two->data, one->size);
6036 }
6037
6038 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
6039 {
6040 if (p->done_skip_stat_unmatch)
6041 return p->skip_stat_unmatch_result;
6042
6043 p->done_skip_stat_unmatch = 1;
6044 p->skip_stat_unmatch_result = 0;
6045 /*
6046 * 1. Entries that come from stat info dirtiness
6047 * always have both sides (iow, not create/delete),
6048 * one side of the object name is unknown, with
6049 * the same mode and size. Keep the ones that
6050 * do not match these criteria. They have real
6051 * differences.
6052 *
6053 * 2. At this point, the file is known to be modified,
6054 * with the same mode and size, and the object
6055 * name of one side is unknown. Need to inspect
6056 * the identical contents.
6057 */
6058 if (!DIFF_FILE_VALID(p->one) || /* (1) */
6059 !DIFF_FILE_VALID(p->two) ||
6060 (p->one->oid_valid && p->two->oid_valid) ||
6061 (p->one->mode != p->two->mode) ||
6062 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
6063 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
6064 (p->one->size != p->two->size) ||
6065 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
6066 p->skip_stat_unmatch_result = 1;
6067 return p->skip_stat_unmatch_result;
6068 }
6069
6070 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
6071 {
6072 int i;
6073 struct diff_queue_struct *q = &diff_queued_diff;
6074 struct diff_queue_struct outq;
6075 DIFF_QUEUE_CLEAR(&outq);
6076
6077 for (i = 0; i < q->nr; i++) {
6078 struct diff_filepair *p = q->queue[i];
6079
6080 if (diff_filespec_check_stat_unmatch(p))
6081 diff_q(&outq, p);
6082 else {
6083 /*
6084 * The caller can subtract 1 from skip_stat_unmatch
6085 * to determine how many paths were dirty only
6086 * due to stat info mismatch.
6087 */
6088 if (!diffopt->flags.no_index)
6089 diffopt->skip_stat_unmatch++;
6090 diff_free_filepair(p);
6091 }
6092 }
6093 free(q->queue);
6094 *q = outq;
6095 }
6096
6097 static int diffnamecmp(const void *a_, const void *b_)
6098 {
6099 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
6100 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
6101 const char *name_a, *name_b;
6102
6103 name_a = a->one ? a->one->path : a->two->path;
6104 name_b = b->one ? b->one->path : b->two->path;
6105 return strcmp(name_a, name_b);
6106 }
6107
6108 void diffcore_fix_diff_index(struct diff_options *options)
6109 {
6110 struct diff_queue_struct *q = &diff_queued_diff;
6111 QSORT(q->queue, q->nr, diffnamecmp);
6112 }
6113
6114 void diffcore_std(struct diff_options *options)
6115 {
6116 /* NOTE please keep the following in sync with diff_tree_combined() */
6117 if (options->skip_stat_unmatch)
6118 diffcore_skip_stat_unmatch(options);
6119 if (!options->found_follow) {
6120 /* See try_to_follow_renames() in tree-diff.c */
6121 if (options->break_opt != -1)
6122 diffcore_break(options->break_opt);
6123 if (options->detect_rename)
6124 diffcore_rename(options);
6125 if (options->break_opt != -1)
6126 diffcore_merge_broken();
6127 }
6128 if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
6129 diffcore_pickaxe(options);
6130 if (options->orderfile)
6131 diffcore_order(options->orderfile);
6132 if (!options->found_follow)
6133 /* See try_to_follow_renames() in tree-diff.c */
6134 diff_resolve_rename_copy();
6135 diffcore_apply_filter(options);
6136
6137 if (diff_queued_diff.nr && !options->flags.diff_from_contents)
6138 options->flags.has_changes = 1;
6139 else
6140 options->flags.has_changes = 0;
6141
6142 options->found_follow = 0;
6143 }
6144
6145 int diff_result_code(struct diff_options *opt, int status)
6146 {
6147 int result = 0;
6148
6149 diff_warn_rename_limit("diff.renameLimit",
6150 opt->needed_rename_limit,
6151 opt->degraded_cc_to_c);
6152 if (!opt->flags.exit_with_status &&
6153 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
6154 return status;
6155 if (opt->flags.exit_with_status &&
6156 opt->flags.has_changes)
6157 result |= 01;
6158 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
6159 opt->flags.check_failed)
6160 result |= 02;
6161 return result;
6162 }
6163
6164 int diff_can_quit_early(struct diff_options *opt)
6165 {
6166 return (opt->flags.quick &&
6167 !opt->filter &&
6168 opt->flags.has_changes);
6169 }
6170
6171 /*
6172 * Shall changes to this submodule be ignored?
6173 *
6174 * Submodule changes can be configured to be ignored separately for each path,
6175 * but that configuration can be overridden from the command line.
6176 */
6177 static int is_submodule_ignored(const char *path, struct diff_options *options)
6178 {
6179 int ignored = 0;
6180 struct diff_flags orig_flags = options->flags;
6181 if (!options->flags.override_submodule_config)
6182 set_diffopt_flags_from_submodule_config(options, path);
6183 if (options->flags.ignore_submodules)
6184 ignored = 1;
6185 options->flags = orig_flags;
6186 return ignored;
6187 }
6188
6189 void diff_addremove(struct diff_options *options,
6190 int addremove, unsigned mode,
6191 const struct object_id *oid,
6192 int oid_valid,
6193 const char *concatpath, unsigned dirty_submodule)
6194 {
6195 struct diff_filespec *one, *two;
6196
6197 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
6198 return;
6199
6200 /* This may look odd, but it is a preparation for
6201 * feeding "there are unchanged files which should
6202 * not produce diffs, but when you are doing copy
6203 * detection you would need them, so here they are"
6204 * entries to the diff-core. They will be prefixed
6205 * with something like '=' or '*' (I haven't decided
6206 * which but should not make any difference).
6207 * Feeding the same new and old to diff_change()
6208 * also has the same effect.
6209 * Before the final output happens, they are pruned after
6210 * merged into rename/copy pairs as appropriate.
6211 */
6212 if (options->flags.reverse_diff)
6213 addremove = (addremove == '+' ? '-' :
6214 addremove == '-' ? '+' : addremove);
6215
6216 if (options->prefix &&
6217 strncmp(concatpath, options->prefix, options->prefix_length))
6218 return;
6219
6220 one = alloc_filespec(concatpath);
6221 two = alloc_filespec(concatpath);
6222
6223 if (addremove != '+')
6224 fill_filespec(one, oid, oid_valid, mode);
6225 if (addremove != '-') {
6226 fill_filespec(two, oid, oid_valid, mode);
6227 two->dirty_submodule = dirty_submodule;
6228 }
6229
6230 diff_queue(&diff_queued_diff, one, two);
6231 if (!options->flags.diff_from_contents)
6232 options->flags.has_changes = 1;
6233 }
6234
6235 void diff_change(struct diff_options *options,
6236 unsigned old_mode, unsigned new_mode,
6237 const struct object_id *old_oid,
6238 const struct object_id *new_oid,
6239 int old_oid_valid, int new_oid_valid,
6240 const char *concatpath,
6241 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
6242 {
6243 struct diff_filespec *one, *two;
6244 struct diff_filepair *p;
6245
6246 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
6247 is_submodule_ignored(concatpath, options))
6248 return;
6249
6250 if (options->flags.reverse_diff) {
6251 SWAP(old_mode, new_mode);
6252 SWAP(old_oid, new_oid);
6253 SWAP(old_oid_valid, new_oid_valid);
6254 SWAP(old_dirty_submodule, new_dirty_submodule);
6255 }
6256
6257 if (options->prefix &&
6258 strncmp(concatpath, options->prefix, options->prefix_length))
6259 return;
6260
6261 one = alloc_filespec(concatpath);
6262 two = alloc_filespec(concatpath);
6263 fill_filespec(one, old_oid, old_oid_valid, old_mode);
6264 fill_filespec(two, new_oid, new_oid_valid, new_mode);
6265 one->dirty_submodule = old_dirty_submodule;
6266 two->dirty_submodule = new_dirty_submodule;
6267 p = diff_queue(&diff_queued_diff, one, two);
6268
6269 if (options->flags.diff_from_contents)
6270 return;
6271
6272 if (options->flags.quick && options->skip_stat_unmatch &&
6273 !diff_filespec_check_stat_unmatch(p))
6274 return;
6275
6276 options->flags.has_changes = 1;
6277 }
6278
6279 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
6280 {
6281 struct diff_filepair *pair;
6282 struct diff_filespec *one, *two;
6283
6284 if (options->prefix &&
6285 strncmp(path, options->prefix, options->prefix_length))
6286 return NULL;
6287
6288 one = alloc_filespec(path);
6289 two = alloc_filespec(path);
6290 pair = diff_queue(&diff_queued_diff, one, two);
6291 pair->is_unmerged = 1;
6292 return pair;
6293 }
6294
6295 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
6296 size_t *outsize)
6297 {
6298 struct diff_tempfile *temp;
6299 const char *argv[3];
6300 const char **arg = argv;
6301 struct child_process child = CHILD_PROCESS_INIT;
6302 struct strbuf buf = STRBUF_INIT;
6303 int err = 0;
6304
6305 temp = prepare_temp_file(spec->path, spec);
6306 *arg++ = pgm;
6307 *arg++ = temp->name;
6308 *arg = NULL;
6309
6310 child.use_shell = 1;
6311 child.argv = argv;
6312 child.out = -1;
6313 if (start_command(&child)) {
6314 remove_tempfile();
6315 return NULL;
6316 }
6317
6318 if (strbuf_read(&buf, child.out, 0) < 0)
6319 err = error("error reading from textconv command '%s'", pgm);
6320 close(child.out);
6321
6322 if (finish_command(&child) || err) {
6323 strbuf_release(&buf);
6324 remove_tempfile();
6325 return NULL;
6326 }
6327 remove_tempfile();
6328
6329 return strbuf_detach(&buf, outsize);
6330 }
6331
6332 size_t fill_textconv(struct userdiff_driver *driver,
6333 struct diff_filespec *df,
6334 char **outbuf)
6335 {
6336 size_t size;
6337
6338 if (!driver) {
6339 if (!DIFF_FILE_VALID(df)) {
6340 *outbuf = "";
6341 return 0;
6342 }
6343 if (diff_populate_filespec(df, 0))
6344 die("unable to read files to diff");
6345 *outbuf = df->data;
6346 return df->size;
6347 }
6348
6349 if (!driver->textconv)
6350 BUG("fill_textconv called with non-textconv driver");
6351
6352 if (driver->textconv_cache && df->oid_valid) {
6353 *outbuf = notes_cache_get(driver->textconv_cache,
6354 &df->oid,
6355 &size);
6356 if (*outbuf)
6357 return size;
6358 }
6359
6360 *outbuf = run_textconv(driver->textconv, df, &size);
6361 if (!*outbuf)
6362 die("unable to read files to diff");
6363
6364 if (driver->textconv_cache && df->oid_valid) {
6365 /* ignore errors, as we might be in a readonly repository */
6366 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
6367 size);
6368 /*
6369 * we could save up changes and flush them all at the end,
6370 * but we would need an extra call after all diffing is done.
6371 * Since generating a cache entry is the slow path anyway,
6372 * this extra overhead probably isn't a big deal.
6373 */
6374 notes_cache_write(driver->textconv_cache);
6375 }
6376
6377 return size;
6378 }
6379
6380 int textconv_object(const char *path,
6381 unsigned mode,
6382 const struct object_id *oid,
6383 int oid_valid,
6384 char **buf,
6385 unsigned long *buf_size)
6386 {
6387 struct diff_filespec *df;
6388 struct userdiff_driver *textconv;
6389
6390 df = alloc_filespec(path);
6391 fill_filespec(df, oid, oid_valid, mode);
6392 textconv = get_textconv(df);
6393 if (!textconv) {
6394 free_filespec(df);
6395 return 0;
6396 }
6397
6398 *buf_size = fill_textconv(textconv, df, buf);
6399 free_filespec(df);
6400 return 1;
6401 }
6402
6403 void setup_diff_pager(struct diff_options *opt)
6404 {
6405 /*
6406 * If the user asked for our exit code, then either they want --quiet
6407 * or --exit-code. We should definitely not bother with a pager in the
6408 * former case, as we will generate no output. Since we still properly
6409 * report our exit code even when a pager is run, we _could_ run a
6410 * pager with --exit-code. But since we have not done so historically,
6411 * and because it is easy to find people oneline advising "git diff
6412 * --exit-code" in hooks and other scripts, we do not do so.
6413 */
6414 if (!opt->flags.exit_with_status &&
6415 check_pager_config("diff") != 0)
6416 setup_pager();
6417 }
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