]> git.ipfire.org Git - thirdparty/git.git/blob - diff.c
projects / thirdparty / git.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
submodule.c: migrate diff output to use emit_diff_symbol
[thirdparty/git.git] / diff.c
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 "userdiff.h"
17 #include "submodule-config.h"
18 #include "submodule.h"
19 #include "ll-merge.h"
20 #include "string-list.h"
21 #include "argv-array.h"
22 #include "graph.h"
23
24 #ifdef NO_FAST_WORKING_DIRECTORY
25 #define FAST_WORKING_DIRECTORY 0
26 #else
27 #define FAST_WORKING_DIRECTORY 1
28 #endif
29
30 static int diff_detect_rename_default;
31 static int diff_indent_heuristic = 1;
32 static int diff_rename_limit_default = 400;
33 static int diff_suppress_blank_empty;
34 static int diff_use_color_default = -1;
35 static int diff_context_default = 3;
36 static int diff_interhunk_context_default;
37 static const char *diff_word_regex_cfg;
38 static const char *external_diff_cmd_cfg;
39 static const char *diff_order_file_cfg;
40 int diff_auto_refresh_index = 1;
41 static int diff_mnemonic_prefix;
42 static int diff_no_prefix;
43 static int diff_stat_graph_width;
44 static int diff_dirstat_permille_default = 30;
45 static struct diff_options default_diff_options;
46 static long diff_algorithm;
47 static unsigned ws_error_highlight_default = WSEH_NEW;
48
49 static char diff_colors[][COLOR_MAXLEN] = {
50 GIT_COLOR_RESET,
51 GIT_COLOR_NORMAL, /* CONTEXT */
52 GIT_COLOR_BOLD, /* METAINFO */
53 GIT_COLOR_CYAN, /* FRAGINFO */
54 GIT_COLOR_RED, /* OLD */
55 GIT_COLOR_GREEN, /* NEW */
56 GIT_COLOR_YELLOW, /* COMMIT */
57 GIT_COLOR_BG_RED, /* WHITESPACE */
58 GIT_COLOR_NORMAL, /* FUNCINFO */
59 };
60
61 static NORETURN void die_want_option(const char *option_name)
62 {
63 die(_("option '%s' requires a value"), option_name);
64 }
65
66 static int parse_diff_color_slot(const char *var)
67 {
68 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
69 return DIFF_CONTEXT;
70 if (!strcasecmp(var, "meta"))
71 return DIFF_METAINFO;
72 if (!strcasecmp(var, "frag"))
73 return DIFF_FRAGINFO;
74 if (!strcasecmp(var, "old"))
75 return DIFF_FILE_OLD;
76 if (!strcasecmp(var, "new"))
77 return DIFF_FILE_NEW;
78 if (!strcasecmp(var, "commit"))
79 return DIFF_COMMIT;
80 if (!strcasecmp(var, "whitespace"))
81 return DIFF_WHITESPACE;
82 if (!strcasecmp(var, "func"))
83 return DIFF_FUNCINFO;
84 return -1;
85 }
86
87 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
88 struct strbuf *errmsg)
89 {
90 char *params_copy = xstrdup(params_string);
91 struct string_list params = STRING_LIST_INIT_NODUP;
92 int ret = 0;
93 int i;
94
95 if (*params_copy)
96 string_list_split_in_place(&params, params_copy, ',', -1);
97 for (i = 0; i < params.nr; i++) {
98 const char *p = params.items[i].string;
99 if (!strcmp(p, "changes")) {
100 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
101 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
102 } else if (!strcmp(p, "lines")) {
103 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
104 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
105 } else if (!strcmp(p, "files")) {
106 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
107 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
108 } else if (!strcmp(p, "noncumulative")) {
109 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
110 } else if (!strcmp(p, "cumulative")) {
111 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
112 } else if (isdigit(*p)) {
113 char *end;
114 int permille = strtoul(p, &end, 10) * 10;
115 if (*end == '.' && isdigit(*++end)) {
116 /* only use first digit */
117 permille += *end - '0';
118 /* .. and ignore any further digits */
119 while (isdigit(*++end))
120 ; /* nothing */
121 }
122 if (!*end)
123 options->dirstat_permille = permille;
124 else {
125 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
126 p);
127 ret++;
128 }
129 } else {
130 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
131 ret++;
132 }
133
134 }
135 string_list_clear(&params, 0);
136 free(params_copy);
137 return ret;
138 }
139
140 static int parse_submodule_params(struct diff_options *options, const char *value)
141 {
142 if (!strcmp(value, "log"))
143 options->submodule_format = DIFF_SUBMODULE_LOG;
144 else if (!strcmp(value, "short"))
145 options->submodule_format = DIFF_SUBMODULE_SHORT;
146 else if (!strcmp(value, "diff"))
147 options->submodule_format = DIFF_SUBMODULE_INLINE_DIFF;
148 else
149 return -1;
150 return 0;
151 }
152
153 static int git_config_rename(const char *var, const char *value)
154 {
155 if (!value)
156 return DIFF_DETECT_RENAME;
157 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
158 return DIFF_DETECT_COPY;
159 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
160 }
161
162 long parse_algorithm_value(const char *value)
163 {
164 if (!value)
165 return -1;
166 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
167 return 0;
168 else if (!strcasecmp(value, "minimal"))
169 return XDF_NEED_MINIMAL;
170 else if (!strcasecmp(value, "patience"))
171 return XDF_PATIENCE_DIFF;
172 else if (!strcasecmp(value, "histogram"))
173 return XDF_HISTOGRAM_DIFF;
174 return -1;
175 }
176
177 static int parse_one_token(const char **arg, const char *token)
178 {
179 const char *rest;
180 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
181 *arg = rest;
182 return 1;
183 }
184 return 0;
185 }
186
187 static int parse_ws_error_highlight(const char *arg)
188 {
189 const char *orig_arg = arg;
190 unsigned val = 0;
191
192 while (*arg) {
193 if (parse_one_token(&arg, "none"))
194 val = 0;
195 else if (parse_one_token(&arg, "default"))
196 val = WSEH_NEW;
197 else if (parse_one_token(&arg, "all"))
198 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
199 else if (parse_one_token(&arg, "new"))
200 val |= WSEH_NEW;
201 else if (parse_one_token(&arg, "old"))
202 val |= WSEH_OLD;
203 else if (parse_one_token(&arg, "context"))
204 val |= WSEH_CONTEXT;
205 else {
206 return -1 - (int)(arg - orig_arg);
207 }
208 if (*arg)
209 arg++;
210 }
211 return val;
212 }
213
214 /*
215 * These are to give UI layer defaults.
216 * The core-level commands such as git-diff-files should
217 * never be affected by the setting of diff.renames
218 * the user happens to have in the configuration file.
219 */
220 void init_diff_ui_defaults(void)
221 {
222 diff_detect_rename_default = 1;
223 }
224
225 int git_diff_heuristic_config(const char *var, const char *value, void *cb)
226 {
227 if (!strcmp(var, "diff.indentheuristic"))
228 diff_indent_heuristic = git_config_bool(var, value);
229 return 0;
230 }
231
232 int git_diff_ui_config(const char *var, const char *value, void *cb)
233 {
234 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
235 diff_use_color_default = git_config_colorbool(var, value);
236 return 0;
237 }
238 if (!strcmp(var, "diff.context")) {
239 diff_context_default = git_config_int(var, value);
240 if (diff_context_default < 0)
241 return -1;
242 return 0;
243 }
244 if (!strcmp(var, "diff.interhunkcontext")) {
245 diff_interhunk_context_default = git_config_int(var, value);
246 if (diff_interhunk_context_default < 0)
247 return -1;
248 return 0;
249 }
250 if (!strcmp(var, "diff.renames")) {
251 diff_detect_rename_default = git_config_rename(var, value);
252 return 0;
253 }
254 if (!strcmp(var, "diff.autorefreshindex")) {
255 diff_auto_refresh_index = git_config_bool(var, value);
256 return 0;
257 }
258 if (!strcmp(var, "diff.mnemonicprefix")) {
259 diff_mnemonic_prefix = git_config_bool(var, value);
260 return 0;
261 }
262 if (!strcmp(var, "diff.noprefix")) {
263 diff_no_prefix = git_config_bool(var, value);
264 return 0;
265 }
266 if (!strcmp(var, "diff.statgraphwidth")) {
267 diff_stat_graph_width = git_config_int(var, value);
268 return 0;
269 }
270 if (!strcmp(var, "diff.external"))
271 return git_config_string(&external_diff_cmd_cfg, var, value);
272 if (!strcmp(var, "diff.wordregex"))
273 return git_config_string(&diff_word_regex_cfg, var, value);
274 if (!strcmp(var, "diff.orderfile"))
275 return git_config_pathname(&diff_order_file_cfg, var, value);
276
277 if (!strcmp(var, "diff.ignoresubmodules"))
278 handle_ignore_submodules_arg(&default_diff_options, value);
279
280 if (!strcmp(var, "diff.submodule")) {
281 if (parse_submodule_params(&default_diff_options, value))
282 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
283 value);
284 return 0;
285 }
286
287 if (!strcmp(var, "diff.algorithm")) {
288 diff_algorithm = parse_algorithm_value(value);
289 if (diff_algorithm < 0)
290 return -1;
291 return 0;
292 }
293
294 if (!strcmp(var, "diff.wserrorhighlight")) {
295 int val = parse_ws_error_highlight(value);
296 if (val < 0)
297 return -1;
298 ws_error_highlight_default = val;
299 return 0;
300 }
301
302 if (git_color_config(var, value, cb) < 0)
303 return -1;
304
305 return git_diff_basic_config(var, value, cb);
306 }
307
308 int git_diff_basic_config(const char *var, const char *value, void *cb)
309 {
310 const char *name;
311
312 if (!strcmp(var, "diff.renamelimit")) {
313 diff_rename_limit_default = git_config_int(var, value);
314 return 0;
315 }
316
317 if (userdiff_config(var, value) < 0)
318 return -1;
319
320 if (skip_prefix(var, "diff.color.", &name) ||
321 skip_prefix(var, "color.diff.", &name)) {
322 int slot = parse_diff_color_slot(name);
323 if (slot < 0)
324 return 0;
325 if (!value)
326 return config_error_nonbool(var);
327 return color_parse(value, diff_colors[slot]);
328 }
329
330 /* like GNU diff's --suppress-blank-empty option */
331 if (!strcmp(var, "diff.suppressblankempty") ||
332 /* for backwards compatibility */
333 !strcmp(var, "diff.suppress-blank-empty")) {
334 diff_suppress_blank_empty = git_config_bool(var, value);
335 return 0;
336 }
337
338 if (!strcmp(var, "diff.dirstat")) {
339 struct strbuf errmsg = STRBUF_INIT;
340 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
341 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
342 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
343 errmsg.buf);
344 strbuf_release(&errmsg);
345 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
346 return 0;
347 }
348
349 if (starts_with(var, "submodule."))
350 return parse_submodule_config_option(var, value);
351
352 if (git_diff_heuristic_config(var, value, cb) < 0)
353 return -1;
354
355 return git_default_config(var, value, cb);
356 }
357
358 static char *quote_two(const char *one, const char *two)
359 {
360 int need_one = quote_c_style(one, NULL, NULL, 1);
361 int need_two = quote_c_style(two, NULL, NULL, 1);
362 struct strbuf res = STRBUF_INIT;
363
364 if (need_one + need_two) {
365 strbuf_addch(&res, '"');
366 quote_c_style(one, &res, NULL, 1);
367 quote_c_style(two, &res, NULL, 1);
368 strbuf_addch(&res, '"');
369 } else {
370 strbuf_addstr(&res, one);
371 strbuf_addstr(&res, two);
372 }
373 return strbuf_detach(&res, NULL);
374 }
375
376 static const char *external_diff(void)
377 {
378 static const char *external_diff_cmd = NULL;
379 static int done_preparing = 0;
380
381 if (done_preparing)
382 return external_diff_cmd;
383 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
384 if (!external_diff_cmd)
385 external_diff_cmd = external_diff_cmd_cfg;
386 done_preparing = 1;
387 return external_diff_cmd;
388 }
389
390 /*
391 * Keep track of files used for diffing. Sometimes such an entry
392 * refers to a temporary file, sometimes to an existing file, and
393 * sometimes to "/dev/null".
394 */
395 static struct diff_tempfile {
396 /*
397 * filename external diff should read from, or NULL if this
398 * entry is currently not in use:
399 */
400 const char *name;
401
402 char hex[GIT_MAX_HEXSZ + 1];
403 char mode[10];
404
405 /*
406 * If this diff_tempfile instance refers to a temporary file,
407 * this tempfile object is used to manage its lifetime.
408 */
409 struct tempfile tempfile;
410 } diff_temp[2];
411
412 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
413
414 struct emit_callback {
415 int color_diff;
416 unsigned ws_rule;
417 int blank_at_eof_in_preimage;
418 int blank_at_eof_in_postimage;
419 int lno_in_preimage;
420 int lno_in_postimage;
421 sane_truncate_fn truncate;
422 const char **label_path;
423 struct diff_words_data *diff_words;
424 struct diff_options *opt;
425 struct strbuf *header;
426 };
427
428 static int count_lines(const char *data, int size)
429 {
430 int count, ch, completely_empty = 1, nl_just_seen = 0;
431 count = 0;
432 while (0 < size--) {
433 ch = *data++;
434 if (ch == '\n') {
435 count++;
436 nl_just_seen = 1;
437 completely_empty = 0;
438 }
439 else {
440 nl_just_seen = 0;
441 completely_empty = 0;
442 }
443 }
444 if (completely_empty)
445 return 0;
446 if (!nl_just_seen)
447 count++; /* no trailing newline */
448 return count;
449 }
450
451 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
452 {
453 if (!DIFF_FILE_VALID(one)) {
454 mf->ptr = (char *)""; /* does not matter */
455 mf->size = 0;
456 return 0;
457 }
458 else if (diff_populate_filespec(one, 0))
459 return -1;
460
461 mf->ptr = one->data;
462 mf->size = one->size;
463 return 0;
464 }
465
466 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
467 static unsigned long diff_filespec_size(struct diff_filespec *one)
468 {
469 if (!DIFF_FILE_VALID(one))
470 return 0;
471 diff_populate_filespec(one, CHECK_SIZE_ONLY);
472 return one->size;
473 }
474
475 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
476 {
477 char *ptr = mf->ptr;
478 long size = mf->size;
479 int cnt = 0;
480
481 if (!size)
482 return cnt;
483 ptr += size - 1; /* pointing at the very end */
484 if (*ptr != '\n')
485 ; /* incomplete line */
486 else
487 ptr--; /* skip the last LF */
488 while (mf->ptr < ptr) {
489 char *prev_eol;
490 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
491 if (*prev_eol == '\n')
492 break;
493 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
494 break;
495 cnt++;
496 ptr = prev_eol - 1;
497 }
498 return cnt;
499 }
500
501 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
502 struct emit_callback *ecbdata)
503 {
504 int l1, l2, at;
505 unsigned ws_rule = ecbdata->ws_rule;
506 l1 = count_trailing_blank(mf1, ws_rule);
507 l2 = count_trailing_blank(mf2, ws_rule);
508 if (l2 <= l1) {
509 ecbdata->blank_at_eof_in_preimage = 0;
510 ecbdata->blank_at_eof_in_postimage = 0;
511 return;
512 }
513 at = count_lines(mf1->ptr, mf1->size);
514 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
515
516 at = count_lines(mf2->ptr, mf2->size);
517 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
518 }
519
520 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
521 int first, const char *line, int len)
522 {
523 int has_trailing_newline, has_trailing_carriage_return;
524 int nofirst;
525 FILE *file = o->file;
526
527 fputs(diff_line_prefix(o), file);
528
529 if (len == 0) {
530 has_trailing_newline = (first == '\n');
531 has_trailing_carriage_return = (!has_trailing_newline &&
532 (first == '\r'));
533 nofirst = has_trailing_newline || has_trailing_carriage_return;
534 } else {
535 has_trailing_newline = (len > 0 && line[len-1] == '\n');
536 if (has_trailing_newline)
537 len--;
538 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
539 if (has_trailing_carriage_return)
540 len--;
541 nofirst = 0;
542 }
543
544 if (len || !nofirst) {
545 fputs(set, file);
546 if (!nofirst)
547 fputc(first, file);
548 fwrite(line, len, 1, file);
549 fputs(reset, file);
550 }
551 if (has_trailing_carriage_return)
552 fputc('\r', file);
553 if (has_trailing_newline)
554 fputc('\n', file);
555 }
556
557 static void emit_line(struct diff_options *o, const char *set, const char *reset,
558 const char *line, int len)
559 {
560 emit_line_0(o, set, reset, line[0], line+1, len-1);
561 }
562
563 enum diff_symbol {
564 DIFF_SYMBOL_SUBMODULE_ADD,
565 DIFF_SYMBOL_SUBMODULE_DEL,
566 DIFF_SYMBOL_SUBMODULE_UNTRACKED,
567 DIFF_SYMBOL_SUBMODULE_MODIFIED,
568 DIFF_SYMBOL_SUBMODULE_HEADER,
569 DIFF_SYMBOL_SUBMODULE_ERROR,
570 DIFF_SYMBOL_SUBMODULE_PIPETHROUGH,
571 DIFF_SYMBOL_REWRITE_DIFF,
572 DIFF_SYMBOL_BINARY_FILES,
573 DIFF_SYMBOL_HEADER,
574 DIFF_SYMBOL_FILEPAIR_PLUS,
575 DIFF_SYMBOL_FILEPAIR_MINUS,
576 DIFF_SYMBOL_WORDS_PORCELAIN,
577 DIFF_SYMBOL_WORDS,
578 DIFF_SYMBOL_CONTEXT,
579 DIFF_SYMBOL_CONTEXT_INCOMPLETE,
580 DIFF_SYMBOL_PLUS,
581 DIFF_SYMBOL_MINUS,
582 DIFF_SYMBOL_NO_LF_EOF,
583 DIFF_SYMBOL_CONTEXT_FRAGINFO,
584 DIFF_SYMBOL_CONTEXT_MARKER,
585 DIFF_SYMBOL_SEPARATOR
586 };
587 /*
588 * Flags for content lines:
589 * 0..12 are whitespace rules
590 * 13-15 are WSEH_NEW | WSEH_OLD | WSEH_CONTEXT
591 * 16 is marking if the line is blank at EOF
592 */
593 #define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
594 #define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)
595
596 static void emit_line_ws_markup(struct diff_options *o,
597 const char *set, const char *reset,
598 const char *line, int len, char sign,
599 unsigned ws_rule, int blank_at_eof)
600 {
601 const char *ws = NULL;
602
603 if (o->ws_error_highlight & ws_rule) {
604 ws = diff_get_color_opt(o, DIFF_WHITESPACE);
605 if (!*ws)
606 ws = NULL;
607 }
608
609 if (!ws)
610 emit_line_0(o, set, reset, sign, line, len);
611 else if (blank_at_eof)
612 /* Blank line at EOF - paint '+' as well */
613 emit_line_0(o, ws, reset, sign, line, len);
614 else {
615 /* Emit just the prefix, then the rest. */
616 emit_line_0(o, set, reset, sign, "", 0);
617 ws_check_emit(line, len, ws_rule,
618 o->file, set, reset, ws);
619 }
620 }
621
622 static void emit_diff_symbol(struct diff_options *o, enum diff_symbol s,
623 const char *line, int len, unsigned flags)
624 {
625 static const char *nneof = " No newline at end of file\n";
626 const char *context, *reset, *set, *meta, *fraginfo;
627 switch (s) {
628 case DIFF_SYMBOL_NO_LF_EOF:
629 context = diff_get_color_opt(o, DIFF_CONTEXT);
630 reset = diff_get_color_opt(o, DIFF_RESET);
631 putc('\n', o->file);
632 emit_line_0(o, context, reset, '\\',
633 nneof, strlen(nneof));
634 break;
635 case DIFF_SYMBOL_SUBMODULE_HEADER:
636 case DIFF_SYMBOL_SUBMODULE_ERROR:
637 case DIFF_SYMBOL_SUBMODULE_PIPETHROUGH:
638 case DIFF_SYMBOL_CONTEXT_FRAGINFO:
639 emit_line(o, "", "", line, len);
640 break;
641 case DIFF_SYMBOL_CONTEXT_INCOMPLETE:
642 case DIFF_SYMBOL_CONTEXT_MARKER:
643 context = diff_get_color_opt(o, DIFF_CONTEXT);
644 reset = diff_get_color_opt(o, DIFF_RESET);
645 emit_line(o, context, reset, line, len);
646 break;
647 case DIFF_SYMBOL_SEPARATOR:
648 fprintf(o->file, "%s%c",
649 diff_line_prefix(o),
650 o->line_termination);
651 break;
652 case DIFF_SYMBOL_CONTEXT:
653 set = diff_get_color_opt(o, DIFF_CONTEXT);
654 reset = diff_get_color_opt(o, DIFF_RESET);
655 emit_line_ws_markup(o, set, reset, line, len, ' ',
656 flags & (DIFF_SYMBOL_CONTENT_WS_MASK), 0);
657 break;
658 case DIFF_SYMBOL_PLUS:
659 set = diff_get_color_opt(o, DIFF_FILE_NEW);
660 reset = diff_get_color_opt(o, DIFF_RESET);
661 emit_line_ws_markup(o, set, reset, line, len, '+',
662 flags & DIFF_SYMBOL_CONTENT_WS_MASK,
663 flags & DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF);
664 break;
665 case DIFF_SYMBOL_MINUS:
666 set = diff_get_color_opt(o, DIFF_FILE_OLD);
667 reset = diff_get_color_opt(o, DIFF_RESET);
668 emit_line_ws_markup(o, set, reset, line, len, '-',
669 flags & DIFF_SYMBOL_CONTENT_WS_MASK, 0);
670 break;
671 case DIFF_SYMBOL_WORDS_PORCELAIN:
672 context = diff_get_color_opt(o, DIFF_CONTEXT);
673 reset = diff_get_color_opt(o, DIFF_RESET);
674 emit_line(o, context, reset, line, len);
675 fputs("~\n", o->file);
676 break;
677 case DIFF_SYMBOL_WORDS:
678 context = diff_get_color_opt(o, DIFF_CONTEXT);
679 reset = diff_get_color_opt(o, DIFF_RESET);
680 /*
681 * Skip the prefix character, if any. With
682 * diff_suppress_blank_empty, there may be
683 * none.
684 */
685 if (line[0] != '\n') {
686 line++;
687 len--;
688 }
689 emit_line(o, context, reset, line, len);
690 break;
691 case DIFF_SYMBOL_FILEPAIR_PLUS:
692 meta = diff_get_color_opt(o, DIFF_METAINFO);
693 reset = diff_get_color_opt(o, DIFF_RESET);
694 fprintf(o->file, "%s%s+++ %s%s%s\n", diff_line_prefix(o), meta,
695 line, reset,
696 strchr(line, ' ') ? "\t" : "");
697 break;
698 case DIFF_SYMBOL_FILEPAIR_MINUS:
699 meta = diff_get_color_opt(o, DIFF_METAINFO);
700 reset = diff_get_color_opt(o, DIFF_RESET);
701 fprintf(o->file, "%s%s--- %s%s%s\n", diff_line_prefix(o), meta,
702 line, reset,
703 strchr(line, ' ') ? "\t" : "");
704 break;
705 case DIFF_SYMBOL_BINARY_FILES:
706 case DIFF_SYMBOL_HEADER:
707 fprintf(o->file, "%s", line);
708 break;
709 case DIFF_SYMBOL_REWRITE_DIFF:
710 fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
711 reset = diff_get_color_opt(o, DIFF_RESET);
712 emit_line(o, fraginfo, reset, line, len);
713 break;
714 case DIFF_SYMBOL_SUBMODULE_ADD:
715 set = diff_get_color_opt(o, DIFF_FILE_NEW);
716 reset = diff_get_color_opt(o, DIFF_RESET);
717 emit_line(o, set, reset, line, len);
718 break;
719 case DIFF_SYMBOL_SUBMODULE_DEL:
720 set = diff_get_color_opt(o, DIFF_FILE_OLD);
721 reset = diff_get_color_opt(o, DIFF_RESET);
722 emit_line(o, set, reset, line, len);
723 break;
724 case DIFF_SYMBOL_SUBMODULE_UNTRACKED:
725 fprintf(o->file, "%sSubmodule %s contains untracked content\n",
726 diff_line_prefix(o), line);
727 break;
728 case DIFF_SYMBOL_SUBMODULE_MODIFIED:
729 fprintf(o->file, "%sSubmodule %s contains modified content\n",
730 diff_line_prefix(o), line);
731 break;
732 default:
733 die("BUG: unknown diff symbol");
734 }
735 }
736
737 void diff_emit_submodule_del(struct diff_options *o, const char *line)
738 {
739 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_DEL, line, strlen(line), 0);
740 }
741
742 void diff_emit_submodule_add(struct diff_options *o, const char *line)
743 {
744 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ADD, line, strlen(line), 0);
745 }
746
747 void diff_emit_submodule_untracked(struct diff_options *o, const char *path)
748 {
749 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_UNTRACKED,
750 path, strlen(path), 0);
751 }
752
753 void diff_emit_submodule_modified(struct diff_options *o, const char *path)
754 {
755 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_MODIFIED,
756 path, strlen(path), 0);
757 }
758
759 void diff_emit_submodule_header(struct diff_options *o, const char *header)
760 {
761 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_HEADER,
762 header, strlen(header), 0);
763 }
764
765 void diff_emit_submodule_error(struct diff_options *o, const char *err)
766 {
767 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_ERROR, err, strlen(err), 0);
768 }
769
770 void diff_emit_submodule_pipethrough(struct diff_options *o,
771 const char *line, int len)
772 {
773 emit_diff_symbol(o, DIFF_SYMBOL_SUBMODULE_PIPETHROUGH, line, len, 0);
774 }
775
776 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
777 {
778 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
779 ecbdata->blank_at_eof_in_preimage &&
780 ecbdata->blank_at_eof_in_postimage &&
781 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
782 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
783 return 0;
784 return ws_blank_line(line, len, ecbdata->ws_rule);
785 }
786
787 static void emit_add_line(const char *reset,
788 struct emit_callback *ecbdata,
789 const char *line, int len)
790 {
791 unsigned flags = WSEH_NEW | ecbdata->ws_rule;
792 if (new_blank_line_at_eof(ecbdata, line, len))
793 flags |= DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF;
794
795 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_PLUS, line, len, flags);
796 }
797
798 static void emit_del_line(const char *reset,
799 struct emit_callback *ecbdata,
800 const char *line, int len)
801 {
802 unsigned flags = WSEH_OLD | ecbdata->ws_rule;
803 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_MINUS, line, len, flags);
804 }
805
806 static void emit_context_line(const char *reset,
807 struct emit_callback *ecbdata,
808 const char *line, int len)
809 {
810 unsigned flags = WSEH_CONTEXT | ecbdata->ws_rule;
811 emit_diff_symbol(ecbdata->opt, DIFF_SYMBOL_CONTEXT, line, len, flags);
812 }
813
814 static void emit_hunk_header(struct emit_callback *ecbdata,
815 const char *line, int len)
816 {
817 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
818 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
819 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
820 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
821 static const char atat[2] = { '@', '@' };
822 const char *cp, *ep;
823 struct strbuf msgbuf = STRBUF_INIT;
824 int org_len = len;
825 int i = 1;
826
827 /*
828 * As a hunk header must begin with "@@ -<old>, +<new> @@",
829 * it always is at least 10 bytes long.
830 */
831 if (len < 10 ||
832 memcmp(line, atat, 2) ||
833 !(ep = memmem(line + 2, len - 2, atat, 2))) {
834 emit_diff_symbol(ecbdata->opt,
835 DIFF_SYMBOL_CONTEXT_MARKER, line, len, 0);
836 return;
837 }
838 ep += 2; /* skip over @@ */
839
840 /* The hunk header in fraginfo color */
841 strbuf_addstr(&msgbuf, frag);
842 strbuf_add(&msgbuf, line, ep - line);
843 strbuf_addstr(&msgbuf, reset);
844
845 /*
846 * trailing "\r\n"
847 */
848 for ( ; i < 3; i++)
849 if (line[len - i] == '\r' || line[len - i] == '\n')
850 len--;
851
852 /* blank before the func header */
853 for (cp = ep; ep - line < len; ep++)
854 if (*ep != ' ' && *ep != '\t')
855 break;
856 if (ep != cp) {
857 strbuf_addstr(&msgbuf, context);
858 strbuf_add(&msgbuf, cp, ep - cp);
859 strbuf_addstr(&msgbuf, reset);
860 }
861
862 if (ep < line + len) {
863 strbuf_addstr(&msgbuf, func);
864 strbuf_add(&msgbuf, ep, line + len - ep);
865 strbuf_addstr(&msgbuf, reset);
866 }
867
868 strbuf_add(&msgbuf, line + len, org_len - len);
869 strbuf_complete_line(&msgbuf);
870 emit_diff_symbol(ecbdata->opt,
871 DIFF_SYMBOL_CONTEXT_FRAGINFO, msgbuf.buf, msgbuf.len, 0);
872 strbuf_release(&msgbuf);
873 }
874
875 static struct diff_tempfile *claim_diff_tempfile(void) {
876 int i;
877 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
878 if (!diff_temp[i].name)
879 return diff_temp + i;
880 die("BUG: diff is failing to clean up its tempfiles");
881 }
882
883 static void remove_tempfile(void)
884 {
885 int i;
886 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
887 if (is_tempfile_active(&diff_temp[i].tempfile))
888 delete_tempfile(&diff_temp[i].tempfile);
889 diff_temp[i].name = NULL;
890 }
891 }
892
893 static void add_line_count(struct strbuf *out, int count)
894 {
895 switch (count) {
896 case 0:
897 strbuf_addstr(out, "0,0");
898 break;
899 case 1:
900 strbuf_addstr(out, "1");
901 break;
902 default:
903 strbuf_addf(out, "1,%d", count);
904 break;
905 }
906 }
907
908 static void emit_rewrite_lines(struct emit_callback *ecb,
909 int prefix, const char *data, int size)
910 {
911 const char *endp = NULL;
912 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
913
914 while (0 < size) {
915 int len;
916
917 endp = memchr(data, '\n', size);
918 len = endp ? (endp - data + 1) : size;
919 if (prefix != '+') {
920 ecb->lno_in_preimage++;
921 emit_del_line(reset, ecb, data, len);
922 } else {
923 ecb->lno_in_postimage++;
924 emit_add_line(reset, ecb, data, len);
925 }
926 size -= len;
927 data += len;
928 }
929 if (!endp)
930 emit_diff_symbol(ecb->opt, DIFF_SYMBOL_NO_LF_EOF, NULL, 0, 0);
931 }
932
933 static void emit_rewrite_diff(const char *name_a,
934 const char *name_b,
935 struct diff_filespec *one,
936 struct diff_filespec *two,
937 struct userdiff_driver *textconv_one,
938 struct userdiff_driver *textconv_two,
939 struct diff_options *o)
940 {
941 int lc_a, lc_b;
942 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
943 const char *a_prefix, *b_prefix;
944 char *data_one, *data_two;
945 size_t size_one, size_two;
946 struct emit_callback ecbdata;
947 struct strbuf out = STRBUF_INIT;
948
949 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
950 a_prefix = o->b_prefix;
951 b_prefix = o->a_prefix;
952 } else {
953 a_prefix = o->a_prefix;
954 b_prefix = o->b_prefix;
955 }
956
957 name_a += (*name_a == '/');
958 name_b += (*name_b == '/');
959
960 strbuf_reset(&a_name);
961 strbuf_reset(&b_name);
962 quote_two_c_style(&a_name, a_prefix, name_a, 0);
963 quote_two_c_style(&b_name, b_prefix, name_b, 0);
964
965 size_one = fill_textconv(textconv_one, one, &data_one);
966 size_two = fill_textconv(textconv_two, two, &data_two);
967
968 memset(&ecbdata, 0, sizeof(ecbdata));
969 ecbdata.color_diff = want_color(o->use_color);
970 ecbdata.ws_rule = whitespace_rule(name_b);
971 ecbdata.opt = o;
972 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
973 mmfile_t mf1, mf2;
974 mf1.ptr = (char *)data_one;
975 mf2.ptr = (char *)data_two;
976 mf1.size = size_one;
977 mf2.size = size_two;
978 check_blank_at_eof(&mf1, &mf2, &ecbdata);
979 }
980 ecbdata.lno_in_preimage = 1;
981 ecbdata.lno_in_postimage = 1;
982
983 lc_a = count_lines(data_one, size_one);
984 lc_b = count_lines(data_two, size_two);
985
986 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
987 a_name.buf, a_name.len, 0);
988 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
989 b_name.buf, b_name.len, 0);
990
991 strbuf_addstr(&out, "@@ -");
992 if (!o->irreversible_delete)
993 add_line_count(&out, lc_a);
994 else
995 strbuf_addstr(&out, "?,?");
996 strbuf_addstr(&out, " +");
997 add_line_count(&out, lc_b);
998 strbuf_addstr(&out, " @@\n");
999 emit_diff_symbol(o, DIFF_SYMBOL_REWRITE_DIFF, out.buf, out.len, 0);
1000 strbuf_release(&out);
1001
1002 if (lc_a && !o->irreversible_delete)
1003 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
1004 if (lc_b)
1005 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
1006 if (textconv_one)
1007 free((char *)data_one);
1008 if (textconv_two)
1009 free((char *)data_two);
1010 }
1011
1012 struct diff_words_buffer {
1013 mmfile_t text;
1014 long alloc;
1015 struct diff_words_orig {
1016 const char *begin, *end;
1017 } *orig;
1018 int orig_nr, orig_alloc;
1019 };
1020
1021 static void diff_words_append(char *line, unsigned long len,
1022 struct diff_words_buffer *buffer)
1023 {
1024 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
1025 line++;
1026 len--;
1027 memcpy(buffer->text.ptr + buffer->text.size, line, len);
1028 buffer->text.size += len;
1029 buffer->text.ptr[buffer->text.size] = '\0';
1030 }
1031
1032 struct diff_words_style_elem {
1033 const char *prefix;
1034 const char *suffix;
1035 const char *color; /* NULL; filled in by the setup code if
1036 * color is enabled */
1037 };
1038
1039 struct diff_words_style {
1040 enum diff_words_type type;
1041 struct diff_words_style_elem new, old, ctx;
1042 const char *newline;
1043 };
1044
1045 static struct diff_words_style diff_words_styles[] = {
1046 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
1047 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
1048 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
1049 };
1050
1051 struct diff_words_data {
1052 struct diff_words_buffer minus, plus;
1053 const char *current_plus;
1054 int last_minus;
1055 struct diff_options *opt;
1056 regex_t *word_regex;
1057 enum diff_words_type type;
1058 struct diff_words_style *style;
1059 };
1060
1061 static int fn_out_diff_words_write_helper(FILE *fp,
1062 struct diff_words_style_elem *st_el,
1063 const char *newline,
1064 size_t count, const char *buf,
1065 const char *line_prefix)
1066 {
1067 int print = 0;
1068
1069 while (count) {
1070 char *p = memchr(buf, '\n', count);
1071 if (print)
1072 fputs(line_prefix, fp);
1073 if (p != buf) {
1074 if (st_el->color && fputs(st_el->color, fp) < 0)
1075 return -1;
1076 if (fputs(st_el->prefix, fp) < 0 ||
1077 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
1078 fputs(st_el->suffix, fp) < 0)
1079 return -1;
1080 if (st_el->color && *st_el->color
1081 && fputs(GIT_COLOR_RESET, fp) < 0)
1082 return -1;
1083 }
1084 if (!p)
1085 return 0;
1086 if (fputs(newline, fp) < 0)
1087 return -1;
1088 count -= p + 1 - buf;
1089 buf = p + 1;
1090 print = 1;
1091 }
1092 return 0;
1093 }
1094
1095 /*
1096 * '--color-words' algorithm can be described as:
1097 *
1098 * 1. collect the minus/plus lines of a diff hunk, divided into
1099 * minus-lines and plus-lines;
1100 *
1101 * 2. break both minus-lines and plus-lines into words and
1102 * place them into two mmfile_t with one word for each line;
1103 *
1104 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
1105 *
1106 * And for the common parts of the both file, we output the plus side text.
1107 * diff_words->current_plus is used to trace the current position of the plus file
1108 * which printed. diff_words->last_minus is used to trace the last minus word
1109 * printed.
1110 *
1111 * For '--graph' to work with '--color-words', we need to output the graph prefix
1112 * on each line of color words output. Generally, there are two conditions on
1113 * which we should output the prefix.
1114 *
1115 * 1. diff_words->last_minus == 0 &&
1116 * diff_words->current_plus == diff_words->plus.text.ptr
1117 *
1118 * that is: the plus text must start as a new line, and if there is no minus
1119 * word printed, a graph prefix must be printed.
1120 *
1121 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
1122 * *(diff_words->current_plus - 1) == '\n'
1123 *
1124 * that is: a graph prefix must be printed following a '\n'
1125 */
1126 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
1127 {
1128 if ((diff_words->last_minus == 0 &&
1129 diff_words->current_plus == diff_words->plus.text.ptr) ||
1130 (diff_words->current_plus > diff_words->plus.text.ptr &&
1131 *(diff_words->current_plus - 1) == '\n')) {
1132 return 1;
1133 } else {
1134 return 0;
1135 }
1136 }
1137
1138 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
1139 {
1140 struct diff_words_data *diff_words = priv;
1141 struct diff_words_style *style = diff_words->style;
1142 int minus_first, minus_len, plus_first, plus_len;
1143 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
1144 struct diff_options *opt = diff_words->opt;
1145 const char *line_prefix;
1146
1147 if (line[0] != '@' || parse_hunk_header(line, len,
1148 &minus_first, &minus_len, &plus_first, &plus_len))
1149 return;
1150
1151 assert(opt);
1152 line_prefix = diff_line_prefix(opt);
1153
1154 /* POSIX requires that first be decremented by one if len == 0... */
1155 if (minus_len) {
1156 minus_begin = diff_words->minus.orig[minus_first].begin;
1157 minus_end =
1158 diff_words->minus.orig[minus_first + minus_len - 1].end;
1159 } else
1160 minus_begin = minus_end =
1161 diff_words->minus.orig[minus_first].end;
1162
1163 if (plus_len) {
1164 plus_begin = diff_words->plus.orig[plus_first].begin;
1165 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
1166 } else
1167 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
1168
1169 if (color_words_output_graph_prefix(diff_words)) {
1170 fputs(line_prefix, diff_words->opt->file);
1171 }
1172 if (diff_words->current_plus != plus_begin) {
1173 fn_out_diff_words_write_helper(diff_words->opt->file,
1174 &style->ctx, style->newline,
1175 plus_begin - diff_words->current_plus,
1176 diff_words->current_plus, line_prefix);
1177 if (*(plus_begin - 1) == '\n')
1178 fputs(line_prefix, diff_words->opt->file);
1179 }
1180 if (minus_begin != minus_end) {
1181 fn_out_diff_words_write_helper(diff_words->opt->file,
1182 &style->old, style->newline,
1183 minus_end - minus_begin, minus_begin,
1184 line_prefix);
1185 }
1186 if (plus_begin != plus_end) {
1187 fn_out_diff_words_write_helper(diff_words->opt->file,
1188 &style->new, style->newline,
1189 plus_end - plus_begin, plus_begin,
1190 line_prefix);
1191 }
1192
1193 diff_words->current_plus = plus_end;
1194 diff_words->last_minus = minus_first;
1195 }
1196
1197 /* This function starts looking at *begin, and returns 0 iff a word was found. */
1198 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
1199 int *begin, int *end)
1200 {
1201 if (word_regex && *begin < buffer->size) {
1202 regmatch_t match[1];
1203 if (!regexec_buf(word_regex, buffer->ptr + *begin,
1204 buffer->size - *begin, 1, match, 0)) {
1205 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
1206 '\n', match[0].rm_eo - match[0].rm_so);
1207 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
1208 *begin += match[0].rm_so;
1209 return *begin >= *end;
1210 }
1211 return -1;
1212 }
1213
1214 /* find the next word */
1215 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
1216 (*begin)++;
1217 if (*begin >= buffer->size)
1218 return -1;
1219
1220 /* find the end of the word */
1221 *end = *begin + 1;
1222 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
1223 (*end)++;
1224
1225 return 0;
1226 }
1227
1228 /*
1229 * This function splits the words in buffer->text, stores the list with
1230 * newline separator into out, and saves the offsets of the original words
1231 * in buffer->orig.
1232 */
1233 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
1234 regex_t *word_regex)
1235 {
1236 int i, j;
1237 long alloc = 0;
1238
1239 out->size = 0;
1240 out->ptr = NULL;
1241
1242 /* fake an empty "0th" word */
1243 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
1244 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
1245 buffer->orig_nr = 1;
1246
1247 for (i = 0; i < buffer->text.size; i++) {
1248 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
1249 return;
1250
1251 /* store original boundaries */
1252 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1253 buffer->orig_alloc);
1254 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1255 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1256 buffer->orig_nr++;
1257
1258 /* store one word */
1259 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1260 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1261 out->ptr[out->size + j - i] = '\n';
1262 out->size += j - i + 1;
1263
1264 i = j - 1;
1265 }
1266 }
1267
1268 /* this executes the word diff on the accumulated buffers */
1269 static void diff_words_show(struct diff_words_data *diff_words)
1270 {
1271 xpparam_t xpp;
1272 xdemitconf_t xecfg;
1273 mmfile_t minus, plus;
1274 struct diff_words_style *style = diff_words->style;
1275
1276 struct diff_options *opt = diff_words->opt;
1277 const char *line_prefix;
1278
1279 assert(opt);
1280 line_prefix = diff_line_prefix(opt);
1281
1282 /* special case: only removal */
1283 if (!diff_words->plus.text.size) {
1284 fputs(line_prefix, diff_words->opt->file);
1285 fn_out_diff_words_write_helper(diff_words->opt->file,
1286 &style->old, style->newline,
1287 diff_words->minus.text.size,
1288 diff_words->minus.text.ptr, line_prefix);
1289 diff_words->minus.text.size = 0;
1290 return;
1291 }
1292
1293 diff_words->current_plus = diff_words->plus.text.ptr;
1294 diff_words->last_minus = 0;
1295
1296 memset(&xpp, 0, sizeof(xpp));
1297 memset(&xecfg, 0, sizeof(xecfg));
1298 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1299 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1300 xpp.flags = 0;
1301 /* as only the hunk header will be parsed, we need a 0-context */
1302 xecfg.ctxlen = 0;
1303 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1304 &xpp, &xecfg))
1305 die("unable to generate word diff");
1306 free(minus.ptr);
1307 free(plus.ptr);
1308 if (diff_words->current_plus != diff_words->plus.text.ptr +
1309 diff_words->plus.text.size) {
1310 if (color_words_output_graph_prefix(diff_words))
1311 fputs(line_prefix, diff_words->opt->file);
1312 fn_out_diff_words_write_helper(diff_words->opt->file,
1313 &style->ctx, style->newline,
1314 diff_words->plus.text.ptr + diff_words->plus.text.size
1315 - diff_words->current_plus, diff_words->current_plus,
1316 line_prefix);
1317 }
1318 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1319 }
1320
1321 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1322 static void diff_words_flush(struct emit_callback *ecbdata)
1323 {
1324 if (ecbdata->diff_words->minus.text.size ||
1325 ecbdata->diff_words->plus.text.size)
1326 diff_words_show(ecbdata->diff_words);
1327 }
1328
1329 static void diff_filespec_load_driver(struct diff_filespec *one)
1330 {
1331 /* Use already-loaded driver */
1332 if (one->driver)
1333 return;
1334
1335 if (S_ISREG(one->mode))
1336 one->driver = userdiff_find_by_path(one->path);
1337
1338 /* Fallback to default settings */
1339 if (!one->driver)
1340 one->driver = userdiff_find_by_name("default");
1341 }
1342
1343 static const char *userdiff_word_regex(struct diff_filespec *one)
1344 {
1345 diff_filespec_load_driver(one);
1346 return one->driver->word_regex;
1347 }
1348
1349 static void init_diff_words_data(struct emit_callback *ecbdata,
1350 struct diff_options *orig_opts,
1351 struct diff_filespec *one,
1352 struct diff_filespec *two)
1353 {
1354 int i;
1355 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1356 memcpy(o, orig_opts, sizeof(struct diff_options));
1357
1358 ecbdata->diff_words =
1359 xcalloc(1, sizeof(struct diff_words_data));
1360 ecbdata->diff_words->type = o->word_diff;
1361 ecbdata->diff_words->opt = o;
1362 if (!o->word_regex)
1363 o->word_regex = userdiff_word_regex(one);
1364 if (!o->word_regex)
1365 o->word_regex = userdiff_word_regex(two);
1366 if (!o->word_regex)
1367 o->word_regex = diff_word_regex_cfg;
1368 if (o->word_regex) {
1369 ecbdata->diff_words->word_regex = (regex_t *)
1370 xmalloc(sizeof(regex_t));
1371 if (regcomp(ecbdata->diff_words->word_regex,
1372 o->word_regex,
1373 REG_EXTENDED | REG_NEWLINE))
1374 die ("Invalid regular expression: %s",
1375 o->word_regex);
1376 }
1377 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1378 if (o->word_diff == diff_words_styles[i].type) {
1379 ecbdata->diff_words->style =
1380 &diff_words_styles[i];
1381 break;
1382 }
1383 }
1384 if (want_color(o->use_color)) {
1385 struct diff_words_style *st = ecbdata->diff_words->style;
1386 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1387 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1388 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1389 }
1390 }
1391
1392 static void free_diff_words_data(struct emit_callback *ecbdata)
1393 {
1394 if (ecbdata->diff_words) {
1395 diff_words_flush(ecbdata);
1396 free (ecbdata->diff_words->opt);
1397 free (ecbdata->diff_words->minus.text.ptr);
1398 free (ecbdata->diff_words->minus.orig);
1399 free (ecbdata->diff_words->plus.text.ptr);
1400 free (ecbdata->diff_words->plus.orig);
1401 if (ecbdata->diff_words->word_regex) {
1402 regfree(ecbdata->diff_words->word_regex);
1403 free(ecbdata->diff_words->word_regex);
1404 }
1405 FREE_AND_NULL(ecbdata->diff_words);
1406 }
1407 }
1408
1409 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1410 {
1411 if (want_color(diff_use_color))
1412 return diff_colors[ix];
1413 return "";
1414 }
1415
1416 const char *diff_line_prefix(struct diff_options *opt)
1417 {
1418 struct strbuf *msgbuf;
1419 if (!opt->output_prefix)
1420 return "";
1421
1422 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1423 return msgbuf->buf;
1424 }
1425
1426 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1427 {
1428 const char *cp;
1429 unsigned long allot;
1430 size_t l = len;
1431
1432 if (ecb->truncate)
1433 return ecb->truncate(line, len);
1434 cp = line;
1435 allot = l;
1436 while (0 < l) {
1437 (void) utf8_width(&cp, &l);
1438 if (!cp)
1439 break; /* truncated in the middle? */
1440 }
1441 return allot - l;
1442 }
1443
1444 static void find_lno(const char *line, struct emit_callback *ecbdata)
1445 {
1446 const char *p;
1447 ecbdata->lno_in_preimage = 0;
1448 ecbdata->lno_in_postimage = 0;
1449 p = strchr(line, '-');
1450 if (!p)
1451 return; /* cannot happen */
1452 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1453 p = strchr(p, '+');
1454 if (!p)
1455 return; /* cannot happen */
1456 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1457 }
1458
1459 static void fn_out_consume(void *priv, char *line, unsigned long len)
1460 {
1461 struct emit_callback *ecbdata = priv;
1462 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1463 struct diff_options *o = ecbdata->opt;
1464
1465 o->found_changes = 1;
1466
1467 if (ecbdata->header) {
1468 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
1469 ecbdata->header->buf, ecbdata->header->len, 0);
1470 strbuf_reset(ecbdata->header);
1471 ecbdata->header = NULL;
1472 }
1473
1474 if (ecbdata->label_path[0]) {
1475 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_MINUS,
1476 ecbdata->label_path[0],
1477 strlen(ecbdata->label_path[0]), 0);
1478 emit_diff_symbol(o, DIFF_SYMBOL_FILEPAIR_PLUS,
1479 ecbdata->label_path[1],
1480 strlen(ecbdata->label_path[1]), 0);
1481 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1482 }
1483
1484 if (diff_suppress_blank_empty
1485 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1486 line[0] = '\n';
1487 len = 1;
1488 }
1489
1490 if (line[0] == '@') {
1491 if (ecbdata->diff_words)
1492 diff_words_flush(ecbdata);
1493 len = sane_truncate_line(ecbdata, line, len);
1494 find_lno(line, ecbdata);
1495 emit_hunk_header(ecbdata, line, len);
1496 return;
1497 }
1498
1499 if (ecbdata->diff_words) {
1500 enum diff_symbol s =
1501 ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN ?
1502 DIFF_SYMBOL_WORDS_PORCELAIN : DIFF_SYMBOL_WORDS;
1503 if (line[0] == '-') {
1504 diff_words_append(line, len,
1505 &ecbdata->diff_words->minus);
1506 return;
1507 } else if (line[0] == '+') {
1508 diff_words_append(line, len,
1509 &ecbdata->diff_words->plus);
1510 return;
1511 } else if (starts_with(line, "\\ ")) {
1512 /*
1513 * Eat the "no newline at eof" marker as if we
1514 * saw a "+" or "-" line with nothing on it,
1515 * and return without diff_words_flush() to
1516 * defer processing. If this is the end of
1517 * preimage, more "+" lines may come after it.
1518 */
1519 return;
1520 }
1521 diff_words_flush(ecbdata);
1522 emit_diff_symbol(o, s, line, len, 0);
1523 return;
1524 }
1525
1526 switch (line[0]) {
1527 case '+':
1528 ecbdata->lno_in_postimage++;
1529 emit_add_line(reset, ecbdata, line + 1, len - 1);
1530 break;
1531 case '-':
1532 ecbdata->lno_in_preimage++;
1533 emit_del_line(reset, ecbdata, line + 1, len - 1);
1534 break;
1535 case ' ':
1536 ecbdata->lno_in_postimage++;
1537 ecbdata->lno_in_preimage++;
1538 emit_context_line(reset, ecbdata, line + 1, len - 1);
1539 break;
1540 default:
1541 /* incomplete line at the end */
1542 ecbdata->lno_in_preimage++;
1543 emit_diff_symbol(o, DIFF_SYMBOL_CONTEXT_INCOMPLETE,
1544 line, len, 0);
1545 break;
1546 }
1547 }
1548
1549 static char *pprint_rename(const char *a, const char *b)
1550 {
1551 const char *old = a;
1552 const char *new = b;
1553 struct strbuf name = STRBUF_INIT;
1554 int pfx_length, sfx_length;
1555 int pfx_adjust_for_slash;
1556 int len_a = strlen(a);
1557 int len_b = strlen(b);
1558 int a_midlen, b_midlen;
1559 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1560 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1561
1562 if (qlen_a || qlen_b) {
1563 quote_c_style(a, &name, NULL, 0);
1564 strbuf_addstr(&name, " => ");
1565 quote_c_style(b, &name, NULL, 0);
1566 return strbuf_detach(&name, NULL);
1567 }
1568
1569 /* Find common prefix */
1570 pfx_length = 0;
1571 while (*old && *new && *old == *new) {
1572 if (*old == '/')
1573 pfx_length = old - a + 1;
1574 old++;
1575 new++;
1576 }
1577
1578 /* Find common suffix */
1579 old = a + len_a;
1580 new = b + len_b;
1581 sfx_length = 0;
1582 /*
1583 * If there is a common prefix, it must end in a slash. In
1584 * that case we let this loop run 1 into the prefix to see the
1585 * same slash.
1586 *
1587 * If there is no common prefix, we cannot do this as it would
1588 * underrun the input strings.
1589 */
1590 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1591 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1592 b + pfx_length - pfx_adjust_for_slash <= new &&
1593 *old == *new) {
1594 if (*old == '/')
1595 sfx_length = len_a - (old - a);
1596 old--;
1597 new--;
1598 }
1599
1600 /*
1601 * pfx{mid-a => mid-b}sfx
1602 * {pfx-a => pfx-b}sfx
1603 * pfx{sfx-a => sfx-b}
1604 * name-a => name-b
1605 */
1606 a_midlen = len_a - pfx_length - sfx_length;
1607 b_midlen = len_b - pfx_length - sfx_length;
1608 if (a_midlen < 0)
1609 a_midlen = 0;
1610 if (b_midlen < 0)
1611 b_midlen = 0;
1612
1613 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1614 if (pfx_length + sfx_length) {
1615 strbuf_add(&name, a, pfx_length);
1616 strbuf_addch(&name, '{');
1617 }
1618 strbuf_add(&name, a + pfx_length, a_midlen);
1619 strbuf_addstr(&name, " => ");
1620 strbuf_add(&name, b + pfx_length, b_midlen);
1621 if (pfx_length + sfx_length) {
1622 strbuf_addch(&name, '}');
1623 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1624 }
1625 return strbuf_detach(&name, NULL);
1626 }
1627
1628 struct diffstat_t {
1629 int nr;
1630 int alloc;
1631 struct diffstat_file {
1632 char *from_name;
1633 char *name;
1634 char *print_name;
1635 unsigned is_unmerged:1;
1636 unsigned is_binary:1;
1637 unsigned is_renamed:1;
1638 unsigned is_interesting:1;
1639 uintmax_t added, deleted;
1640 } **files;
1641 };
1642
1643 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1644 const char *name_a,
1645 const char *name_b)
1646 {
1647 struct diffstat_file *x;
1648 x = xcalloc(1, sizeof(*x));
1649 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1650 diffstat->files[diffstat->nr++] = x;
1651 if (name_b) {
1652 x->from_name = xstrdup(name_a);
1653 x->name = xstrdup(name_b);
1654 x->is_renamed = 1;
1655 }
1656 else {
1657 x->from_name = NULL;
1658 x->name = xstrdup(name_a);
1659 }
1660 return x;
1661 }
1662
1663 static void diffstat_consume(void *priv, char *line, unsigned long len)
1664 {
1665 struct diffstat_t *diffstat = priv;
1666 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1667
1668 if (line[0] == '+')
1669 x->added++;
1670 else if (line[0] == '-')
1671 x->deleted++;
1672 }
1673
1674 const char mime_boundary_leader[] = "------------";
1675
1676 static int scale_linear(int it, int width, int max_change)
1677 {
1678 if (!it)
1679 return 0;
1680 /*
1681 * make sure that at least one '-' or '+' is printed if
1682 * there is any change to this path. The easiest way is to
1683 * scale linearly as if the alloted width is one column shorter
1684 * than it is, and then add 1 to the result.
1685 */
1686 return 1 + (it * (width - 1) / max_change);
1687 }
1688
1689 static void show_name(FILE *file,
1690 const char *prefix, const char *name, int len)
1691 {
1692 fprintf(file, " %s%-*s |", prefix, len, name);
1693 }
1694
1695 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1696 {
1697 if (cnt <= 0)
1698 return;
1699 fprintf(file, "%s", set);
1700 while (cnt--)
1701 putc(ch, file);
1702 fprintf(file, "%s", reset);
1703 }
1704
1705 static void fill_print_name(struct diffstat_file *file)
1706 {
1707 char *pname;
1708
1709 if (file->print_name)
1710 return;
1711
1712 if (!file->is_renamed) {
1713 struct strbuf buf = STRBUF_INIT;
1714 if (quote_c_style(file->name, &buf, NULL, 0)) {
1715 pname = strbuf_detach(&buf, NULL);
1716 } else {
1717 pname = file->name;
1718 strbuf_release(&buf);
1719 }
1720 } else {
1721 pname = pprint_rename(file->from_name, file->name);
1722 }
1723 file->print_name = pname;
1724 }
1725
1726 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1727 {
1728 struct strbuf sb = STRBUF_INIT;
1729 int ret;
1730
1731 if (!files) {
1732 assert(insertions == 0 && deletions == 0);
1733 return fprintf(fp, "%s\n", " 0 files changed");
1734 }
1735
1736 strbuf_addf(&sb,
1737 (files == 1) ? " %d file changed" : " %d files changed",
1738 files);
1739
1740 /*
1741 * For binary diff, the caller may want to print "x files
1742 * changed" with insertions == 0 && deletions == 0.
1743 *
1744 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1745 * is probably less confusing (i.e skip over "2 files changed
1746 * but nothing about added/removed lines? Is this a bug in Git?").
1747 */
1748 if (insertions || deletions == 0) {
1749 strbuf_addf(&sb,
1750 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1751 insertions);
1752 }
1753
1754 if (deletions || insertions == 0) {
1755 strbuf_addf(&sb,
1756 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1757 deletions);
1758 }
1759 strbuf_addch(&sb, '\n');
1760 ret = fputs(sb.buf, fp);
1761 strbuf_release(&sb);
1762 return ret;
1763 }
1764
1765 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1766 {
1767 int i, len, add, del, adds = 0, dels = 0;
1768 uintmax_t max_change = 0, max_len = 0;
1769 int total_files = data->nr, count;
1770 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1771 const char *reset, *add_c, *del_c;
1772 const char *line_prefix = "";
1773 int extra_shown = 0;
1774
1775 if (data->nr == 0)
1776 return;
1777
1778 line_prefix = diff_line_prefix(options);
1779 count = options->stat_count ? options->stat_count : data->nr;
1780
1781 reset = diff_get_color_opt(options, DIFF_RESET);
1782 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1783 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1784
1785 /*
1786 * Find the longest filename and max number of changes
1787 */
1788 for (i = 0; (i < count) && (i < data->nr); i++) {
1789 struct diffstat_file *file = data->files[i];
1790 uintmax_t change = file->added + file->deleted;
1791
1792 if (!file->is_interesting && (change == 0)) {
1793 count++; /* not shown == room for one more */
1794 continue;
1795 }
1796 fill_print_name(file);
1797 len = strlen(file->print_name);
1798 if (max_len < len)
1799 max_len = len;
1800
1801 if (file->is_unmerged) {
1802 /* "Unmerged" is 8 characters */
1803 bin_width = bin_width < 8 ? 8 : bin_width;
1804 continue;
1805 }
1806 if (file->is_binary) {
1807 /* "Bin XXX -> YYY bytes" */
1808 int w = 14 + decimal_width(file->added)
1809 + decimal_width(file->deleted);
1810 bin_width = bin_width < w ? w : bin_width;
1811 /* Display change counts aligned with "Bin" */
1812 number_width = 3;
1813 continue;
1814 }
1815
1816 if (max_change < change)
1817 max_change = change;
1818 }
1819 count = i; /* where we can stop scanning in data->files[] */
1820
1821 /*
1822 * We have width = stat_width or term_columns() columns total.
1823 * We want a maximum of min(max_len, stat_name_width) for the name part.
1824 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1825 * We also need 1 for " " and 4 + decimal_width(max_change)
1826 * for " | NNNN " and one the empty column at the end, altogether
1827 * 6 + decimal_width(max_change).
1828 *
1829 * If there's not enough space, we will use the smaller of
1830 * stat_name_width (if set) and 5/8*width for the filename,
1831 * and the rest for constant elements + graph part, but no more
1832 * than stat_graph_width for the graph part.
1833 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1834 * for the standard terminal size).
1835 *
1836 * In other words: stat_width limits the maximum width, and
1837 * stat_name_width fixes the maximum width of the filename,
1838 * and is also used to divide available columns if there
1839 * aren't enough.
1840 *
1841 * Binary files are displayed with "Bin XXX -> YYY bytes"
1842 * instead of the change count and graph. This part is treated
1843 * similarly to the graph part, except that it is not
1844 * "scaled". If total width is too small to accommodate the
1845 * guaranteed minimum width of the filename part and the
1846 * separators and this message, this message will "overflow"
1847 * making the line longer than the maximum width.
1848 */
1849
1850 if (options->stat_width == -1)
1851 width = term_columns() - strlen(line_prefix);
1852 else
1853 width = options->stat_width ? options->stat_width : 80;
1854 number_width = decimal_width(max_change) > number_width ?
1855 decimal_width(max_change) : number_width;
1856
1857 if (options->stat_graph_width == -1)
1858 options->stat_graph_width = diff_stat_graph_width;
1859
1860 /*
1861 * Guarantee 3/8*16==6 for the graph part
1862 * and 5/8*16==10 for the filename part
1863 */
1864 if (width < 16 + 6 + number_width)
1865 width = 16 + 6 + number_width;
1866
1867 /*
1868 * First assign sizes that are wanted, ignoring available width.
1869 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1870 * starting from "XXX" should fit in graph_width.
1871 */
1872 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1873 if (options->stat_graph_width &&
1874 options->stat_graph_width < graph_width)
1875 graph_width = options->stat_graph_width;
1876
1877 name_width = (options->stat_name_width > 0 &&
1878 options->stat_name_width < max_len) ?
1879 options->stat_name_width : max_len;
1880
1881 /*
1882 * Adjust adjustable widths not to exceed maximum width
1883 */
1884 if (name_width + number_width + 6 + graph_width > width) {
1885 if (graph_width > width * 3/8 - number_width - 6) {
1886 graph_width = width * 3/8 - number_width - 6;
1887 if (graph_width < 6)
1888 graph_width = 6;
1889 }
1890
1891 if (options->stat_graph_width &&
1892 graph_width > options->stat_graph_width)
1893 graph_width = options->stat_graph_width;
1894 if (name_width > width - number_width - 6 - graph_width)
1895 name_width = width - number_width - 6 - graph_width;
1896 else
1897 graph_width = width - number_width - 6 - name_width;
1898 }
1899
1900 /*
1901 * From here name_width is the width of the name area,
1902 * and graph_width is the width of the graph area.
1903 * max_change is used to scale graph properly.
1904 */
1905 for (i = 0; i < count; i++) {
1906 const char *prefix = "";
1907 struct diffstat_file *file = data->files[i];
1908 char *name = file->print_name;
1909 uintmax_t added = file->added;
1910 uintmax_t deleted = file->deleted;
1911 int name_len;
1912
1913 if (!file->is_interesting && (added + deleted == 0))
1914 continue;
1915
1916 /*
1917 * "scale" the filename
1918 */
1919 len = name_width;
1920 name_len = strlen(name);
1921 if (name_width < name_len) {
1922 char *slash;
1923 prefix = "...";
1924 len -= 3;
1925 name += name_len - len;
1926 slash = strchr(name, '/');
1927 if (slash)
1928 name = slash;
1929 }
1930
1931 if (file->is_binary) {
1932 fprintf(options->file, "%s", line_prefix);
1933 show_name(options->file, prefix, name, len);
1934 fprintf(options->file, " %*s", number_width, "Bin");
1935 if (!added && !deleted) {
1936 putc('\n', options->file);
1937 continue;
1938 }
1939 fprintf(options->file, " %s%"PRIuMAX"%s",
1940 del_c, deleted, reset);
1941 fprintf(options->file, " -> ");
1942 fprintf(options->file, "%s%"PRIuMAX"%s",
1943 add_c, added, reset);
1944 fprintf(options->file, " bytes");
1945 fprintf(options->file, "\n");
1946 continue;
1947 }
1948 else if (file->is_unmerged) {
1949 fprintf(options->file, "%s", line_prefix);
1950 show_name(options->file, prefix, name, len);
1951 fprintf(options->file, " Unmerged\n");
1952 continue;
1953 }
1954
1955 /*
1956 * scale the add/delete
1957 */
1958 add = added;
1959 del = deleted;
1960
1961 if (graph_width <= max_change) {
1962 int total = scale_linear(add + del, graph_width, max_change);
1963 if (total < 2 && add && del)
1964 /* width >= 2 due to the sanity check */
1965 total = 2;
1966 if (add < del) {
1967 add = scale_linear(add, graph_width, max_change);
1968 del = total - add;
1969 } else {
1970 del = scale_linear(del, graph_width, max_change);
1971 add = total - del;
1972 }
1973 }
1974 fprintf(options->file, "%s", line_prefix);
1975 show_name(options->file, prefix, name, len);
1976 fprintf(options->file, " %*"PRIuMAX"%s",
1977 number_width, added + deleted,
1978 added + deleted ? " " : "");
1979 show_graph(options->file, '+', add, add_c, reset);
1980 show_graph(options->file, '-', del, del_c, reset);
1981 fprintf(options->file, "\n");
1982 }
1983
1984 for (i = 0; i < data->nr; i++) {
1985 struct diffstat_file *file = data->files[i];
1986 uintmax_t added = file->added;
1987 uintmax_t deleted = file->deleted;
1988
1989 if (file->is_unmerged ||
1990 (!file->is_interesting && (added + deleted == 0))) {
1991 total_files--;
1992 continue;
1993 }
1994
1995 if (!file->is_binary) {
1996 adds += added;
1997 dels += deleted;
1998 }
1999 if (i < count)
2000 continue;
2001 if (!extra_shown)
2002 fprintf(options->file, "%s ...\n", line_prefix);
2003 extra_shown = 1;
2004 }
2005 fprintf(options->file, "%s", line_prefix);
2006 print_stat_summary(options->file, total_files, adds, dels);
2007 }
2008
2009 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
2010 {
2011 int i, adds = 0, dels = 0, total_files = data->nr;
2012
2013 if (data->nr == 0)
2014 return;
2015
2016 for (i = 0; i < data->nr; i++) {
2017 int added = data->files[i]->added;
2018 int deleted= data->files[i]->deleted;
2019
2020 if (data->files[i]->is_unmerged ||
2021 (!data->files[i]->is_interesting && (added + deleted == 0))) {
2022 total_files--;
2023 } else if (!data->files[i]->is_binary) { /* don't count bytes */
2024 adds += added;
2025 dels += deleted;
2026 }
2027 }
2028 fprintf(options->file, "%s", diff_line_prefix(options));
2029 print_stat_summary(options->file, total_files, adds, dels);
2030 }
2031
2032 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
2033 {
2034 int i;
2035
2036 if (data->nr == 0)
2037 return;
2038
2039 for (i = 0; i < data->nr; i++) {
2040 struct diffstat_file *file = data->files[i];
2041
2042 fprintf(options->file, "%s", diff_line_prefix(options));
2043
2044 if (file->is_binary)
2045 fprintf(options->file, "-\t-\t");
2046 else
2047 fprintf(options->file,
2048 "%"PRIuMAX"\t%"PRIuMAX"\t",
2049 file->added, file->deleted);
2050 if (options->line_termination) {
2051 fill_print_name(file);
2052 if (!file->is_renamed)
2053 write_name_quoted(file->name, options->file,
2054 options->line_termination);
2055 else {
2056 fputs(file->print_name, options->file);
2057 putc(options->line_termination, options->file);
2058 }
2059 } else {
2060 if (file->is_renamed) {
2061 putc('\0', options->file);
2062 write_name_quoted(file->from_name, options->file, '\0');
2063 }
2064 write_name_quoted(file->name, options->file, '\0');
2065 }
2066 }
2067 }
2068
2069 struct dirstat_file {
2070 const char *name;
2071 unsigned long changed;
2072 };
2073
2074 struct dirstat_dir {
2075 struct dirstat_file *files;
2076 int alloc, nr, permille, cumulative;
2077 };
2078
2079 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
2080 unsigned long changed, const char *base, int baselen)
2081 {
2082 unsigned long this_dir = 0;
2083 unsigned int sources = 0;
2084 const char *line_prefix = diff_line_prefix(opt);
2085
2086 while (dir->nr) {
2087 struct dirstat_file *f = dir->files;
2088 int namelen = strlen(f->name);
2089 unsigned long this;
2090 char *slash;
2091
2092 if (namelen < baselen)
2093 break;
2094 if (memcmp(f->name, base, baselen))
2095 break;
2096 slash = strchr(f->name + baselen, '/');
2097 if (slash) {
2098 int newbaselen = slash + 1 - f->name;
2099 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
2100 sources++;
2101 } else {
2102 this = f->changed;
2103 dir->files++;
2104 dir->nr--;
2105 sources += 2;
2106 }
2107 this_dir += this;
2108 }
2109
2110 /*
2111 * We don't report dirstat's for
2112 * - the top level
2113 * - or cases where everything came from a single directory
2114 * under this directory (sources == 1).
2115 */
2116 if (baselen && sources != 1) {
2117 if (this_dir) {
2118 int permille = this_dir * 1000 / changed;
2119 if (permille >= dir->permille) {
2120 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
2121 permille / 10, permille % 10, baselen, base);
2122 if (!dir->cumulative)
2123 return 0;
2124 }
2125 }
2126 }
2127 return this_dir;
2128 }
2129
2130 static int dirstat_compare(const void *_a, const void *_b)
2131 {
2132 const struct dirstat_file *a = _a;
2133 const struct dirstat_file *b = _b;
2134 return strcmp(a->name, b->name);
2135 }
2136
2137 static void show_dirstat(struct diff_options *options)
2138 {
2139 int i;
2140 unsigned long changed;
2141 struct dirstat_dir dir;
2142 struct diff_queue_struct *q = &diff_queued_diff;
2143
2144 dir.files = NULL;
2145 dir.alloc = 0;
2146 dir.nr = 0;
2147 dir.permille = options->dirstat_permille;
2148 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2149
2150 changed = 0;
2151 for (i = 0; i < q->nr; i++) {
2152 struct diff_filepair *p = q->queue[i];
2153 const char *name;
2154 unsigned long copied, added, damage;
2155 int content_changed;
2156
2157 name = p->two->path ? p->two->path : p->one->path;
2158
2159 if (p->one->oid_valid && p->two->oid_valid)
2160 content_changed = oidcmp(&p->one->oid, &p->two->oid);
2161 else
2162 content_changed = 1;
2163
2164 if (!content_changed) {
2165 /*
2166 * The SHA1 has not changed, so pre-/post-content is
2167 * identical. We can therefore skip looking at the
2168 * file contents altogether.
2169 */
2170 damage = 0;
2171 goto found_damage;
2172 }
2173
2174 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
2175 /*
2176 * In --dirstat-by-file mode, we don't really need to
2177 * look at the actual file contents at all.
2178 * The fact that the SHA1 changed is enough for us to
2179 * add this file to the list of results
2180 * (with each file contributing equal damage).
2181 */
2182 damage = 1;
2183 goto found_damage;
2184 }
2185
2186 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
2187 diff_populate_filespec(p->one, 0);
2188 diff_populate_filespec(p->two, 0);
2189 diffcore_count_changes(p->one, p->two, NULL, NULL,
2190 &copied, &added);
2191 diff_free_filespec_data(p->one);
2192 diff_free_filespec_data(p->two);
2193 } else if (DIFF_FILE_VALID(p->one)) {
2194 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
2195 copied = added = 0;
2196 diff_free_filespec_data(p->one);
2197 } else if (DIFF_FILE_VALID(p->two)) {
2198 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
2199 copied = 0;
2200 added = p->two->size;
2201 diff_free_filespec_data(p->two);
2202 } else
2203 continue;
2204
2205 /*
2206 * Original minus copied is the removed material,
2207 * added is the new material. They are both damages
2208 * made to the preimage.
2209 * If the resulting damage is zero, we know that
2210 * diffcore_count_changes() considers the two entries to
2211 * be identical, but since content_changed is true, we
2212 * know that there must have been _some_ kind of change,
2213 * so we force all entries to have damage > 0.
2214 */
2215 damage = (p->one->size - copied) + added;
2216 if (!damage)
2217 damage = 1;
2218
2219 found_damage:
2220 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2221 dir.files[dir.nr].name = name;
2222 dir.files[dir.nr].changed = damage;
2223 changed += damage;
2224 dir.nr++;
2225 }
2226
2227 /* This can happen even with many files, if everything was renames */
2228 if (!changed)
2229 return;
2230
2231 /* Show all directories with more than x% of the changes */
2232 QSORT(dir.files, dir.nr, dirstat_compare);
2233 gather_dirstat(options, &dir, changed, "", 0);
2234 }
2235
2236 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2237 {
2238 int i;
2239 unsigned long changed;
2240 struct dirstat_dir dir;
2241
2242 if (data->nr == 0)
2243 return;
2244
2245 dir.files = NULL;
2246 dir.alloc = 0;
2247 dir.nr = 0;
2248 dir.permille = options->dirstat_permille;
2249 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2250
2251 changed = 0;
2252 for (i = 0; i < data->nr; i++) {
2253 struct diffstat_file *file = data->files[i];
2254 unsigned long damage = file->added + file->deleted;
2255 if (file->is_binary)
2256 /*
2257 * binary files counts bytes, not lines. Must find some
2258 * way to normalize binary bytes vs. textual lines.
2259 * The following heuristic assumes that there are 64
2260 * bytes per "line".
2261 * This is stupid and ugly, but very cheap...
2262 */
2263 damage = (damage + 63) / 64;
2264 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2265 dir.files[dir.nr].name = file->name;
2266 dir.files[dir.nr].changed = damage;
2267 changed += damage;
2268 dir.nr++;
2269 }
2270
2271 /* This can happen even with many files, if everything was renames */
2272 if (!changed)
2273 return;
2274
2275 /* Show all directories with more than x% of the changes */
2276 QSORT(dir.files, dir.nr, dirstat_compare);
2277 gather_dirstat(options, &dir, changed, "", 0);
2278 }
2279
2280 static void free_diffstat_info(struct diffstat_t *diffstat)
2281 {
2282 int i;
2283 for (i = 0; i < diffstat->nr; i++) {
2284 struct diffstat_file *f = diffstat->files[i];
2285 if (f->name != f->print_name)
2286 free(f->print_name);
2287 free(f->name);
2288 free(f->from_name);
2289 free(f);
2290 }
2291 free(diffstat->files);
2292 }
2293
2294 struct checkdiff_t {
2295 const char *filename;
2296 int lineno;
2297 int conflict_marker_size;
2298 struct diff_options *o;
2299 unsigned ws_rule;
2300 unsigned status;
2301 };
2302
2303 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2304 {
2305 char firstchar;
2306 int cnt;
2307
2308 if (len < marker_size + 1)
2309 return 0;
2310 firstchar = line[0];
2311 switch (firstchar) {
2312 case '=': case '>': case '<': case '|':
2313 break;
2314 default:
2315 return 0;
2316 }
2317 for (cnt = 1; cnt < marker_size; cnt++)
2318 if (line[cnt] != firstchar)
2319 return 0;
2320 /* line[1] thru line[marker_size-1] are same as firstchar */
2321 if (len < marker_size + 1 || !isspace(line[marker_size]))
2322 return 0;
2323 return 1;
2324 }
2325
2326 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2327 {
2328 struct checkdiff_t *data = priv;
2329 int marker_size = data->conflict_marker_size;
2330 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2331 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2332 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2333 char *err;
2334 const char *line_prefix;
2335
2336 assert(data->o);
2337 line_prefix = diff_line_prefix(data->o);
2338
2339 if (line[0] == '+') {
2340 unsigned bad;
2341 data->lineno++;
2342 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2343 data->status |= 1;
2344 fprintf(data->o->file,
2345 "%s%s:%d: leftover conflict marker\n",
2346 line_prefix, data->filename, data->lineno);
2347 }
2348 bad = ws_check(line + 1, len - 1, data->ws_rule);
2349 if (!bad)
2350 return;
2351 data->status |= bad;
2352 err = whitespace_error_string(bad);
2353 fprintf(data->o->file, "%s%s:%d: %s.\n",
2354 line_prefix, data->filename, data->lineno, err);
2355 free(err);
2356 emit_line(data->o, set, reset, line, 1);
2357 ws_check_emit(line + 1, len - 1, data->ws_rule,
2358 data->o->file, set, reset, ws);
2359 } else if (line[0] == ' ') {
2360 data->lineno++;
2361 } else if (line[0] == '@') {
2362 char *plus = strchr(line, '+');
2363 if (plus)
2364 data->lineno = strtol(plus, NULL, 10) - 1;
2365 else
2366 die("invalid diff");
2367 }
2368 }
2369
2370 static unsigned char *deflate_it(char *data,
2371 unsigned long size,
2372 unsigned long *result_size)
2373 {
2374 int bound;
2375 unsigned char *deflated;
2376 git_zstream stream;
2377
2378 git_deflate_init(&stream, zlib_compression_level);
2379 bound = git_deflate_bound(&stream, size);
2380 deflated = xmalloc(bound);
2381 stream.next_out = deflated;
2382 stream.avail_out = bound;
2383
2384 stream.next_in = (unsigned char *)data;
2385 stream.avail_in = size;
2386 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2387 ; /* nothing */
2388 git_deflate_end(&stream);
2389 *result_size = stream.total_out;
2390 return deflated;
2391 }
2392
2393 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2394 const char *prefix)
2395 {
2396 void *cp;
2397 void *delta;
2398 void *deflated;
2399 void *data;
2400 unsigned long orig_size;
2401 unsigned long delta_size;
2402 unsigned long deflate_size;
2403 unsigned long data_size;
2404
2405 /* We could do deflated delta, or we could do just deflated two,
2406 * whichever is smaller.
2407 */
2408 delta = NULL;
2409 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2410 if (one->size && two->size) {
2411 delta = diff_delta(one->ptr, one->size,
2412 two->ptr, two->size,
2413 &delta_size, deflate_size);
2414 if (delta) {
2415 void *to_free = delta;
2416 orig_size = delta_size;
2417 delta = deflate_it(delta, delta_size, &delta_size);
2418 free(to_free);
2419 }
2420 }
2421
2422 if (delta && delta_size < deflate_size) {
2423 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2424 free(deflated);
2425 data = delta;
2426 data_size = delta_size;
2427 }
2428 else {
2429 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2430 free(delta);
2431 data = deflated;
2432 data_size = deflate_size;
2433 }
2434
2435 /* emit data encoded in base85 */
2436 cp = data;
2437 while (data_size) {
2438 int bytes = (52 < data_size) ? 52 : data_size;
2439 char line[70];
2440 data_size -= bytes;
2441 if (bytes <= 26)
2442 line[0] = bytes + 'A' - 1;
2443 else
2444 line[0] = bytes - 26 + 'a' - 1;
2445 encode_85(line + 1, cp, bytes);
2446 cp = (char *) cp + bytes;
2447 fprintf(file, "%s", prefix);
2448 fputs(line, file);
2449 fputc('\n', file);
2450 }
2451 fprintf(file, "%s\n", prefix);
2452 free(data);
2453 }
2454
2455 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2456 const char *prefix)
2457 {
2458 fprintf(file, "%sGIT binary patch\n", prefix);
2459 emit_binary_diff_body(file, one, two, prefix);
2460 emit_binary_diff_body(file, two, one, prefix);
2461 }
2462
2463 int diff_filespec_is_binary(struct diff_filespec *one)
2464 {
2465 if (one->is_binary == -1) {
2466 diff_filespec_load_driver(one);
2467 if (one->driver->binary != -1)
2468 one->is_binary = one->driver->binary;
2469 else {
2470 if (!one->data && DIFF_FILE_VALID(one))
2471 diff_populate_filespec(one, CHECK_BINARY);
2472 if (one->is_binary == -1 && one->data)
2473 one->is_binary = buffer_is_binary(one->data,
2474 one->size);
2475 if (one->is_binary == -1)
2476 one->is_binary = 0;
2477 }
2478 }
2479 return one->is_binary;
2480 }
2481
2482 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2483 {
2484 diff_filespec_load_driver(one);
2485 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2486 }
2487
2488 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2489 {
2490 if (!options->a_prefix)
2491 options->a_prefix = a;
2492 if (!options->b_prefix)
2493 options->b_prefix = b;
2494 }
2495
2496 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2497 {
2498 if (!DIFF_FILE_VALID(one))
2499 return NULL;
2500
2501 diff_filespec_load_driver(one);
2502 return userdiff_get_textconv(one->driver);
2503 }
2504
2505 static void builtin_diff(const char *name_a,
2506 const char *name_b,
2507 struct diff_filespec *one,
2508 struct diff_filespec *two,
2509 const char *xfrm_msg,
2510 int must_show_header,
2511 struct diff_options *o,
2512 int complete_rewrite)
2513 {
2514 mmfile_t mf1, mf2;
2515 const char *lbl[2];
2516 char *a_one, *b_two;
2517 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2518 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2519 const char *a_prefix, *b_prefix;
2520 struct userdiff_driver *textconv_one = NULL;
2521 struct userdiff_driver *textconv_two = NULL;
2522 struct strbuf header = STRBUF_INIT;
2523 const char *line_prefix = diff_line_prefix(o);
2524
2525 diff_set_mnemonic_prefix(o, "a/", "b/");
2526 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2527 a_prefix = o->b_prefix;
2528 b_prefix = o->a_prefix;
2529 } else {
2530 a_prefix = o->a_prefix;
2531 b_prefix = o->b_prefix;
2532 }
2533
2534 if (o->submodule_format == DIFF_SUBMODULE_LOG &&
2535 (!one->mode || S_ISGITLINK(one->mode)) &&
2536 (!two->mode || S_ISGITLINK(two->mode))) {
2537 show_submodule_summary(o, one->path ? one->path : two->path,
2538 &one->oid, &two->oid,
2539 two->dirty_submodule);
2540 return;
2541 } else if (o->submodule_format == DIFF_SUBMODULE_INLINE_DIFF &&
2542 (!one->mode || S_ISGITLINK(one->mode)) &&
2543 (!two->mode || S_ISGITLINK(two->mode))) {
2544 show_submodule_inline_diff(o, one->path ? one->path : two->path,
2545 &one->oid, &two->oid,
2546 two->dirty_submodule);
2547 return;
2548 }
2549
2550 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2551 textconv_one = get_textconv(one);
2552 textconv_two = get_textconv(two);
2553 }
2554
2555 /* Never use a non-valid filename anywhere if at all possible */
2556 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2557 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2558
2559 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2560 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2561 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2562 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2563 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2564 if (lbl[0][0] == '/') {
2565 /* /dev/null */
2566 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2567 if (xfrm_msg)
2568 strbuf_addstr(&header, xfrm_msg);
2569 must_show_header = 1;
2570 }
2571 else if (lbl[1][0] == '/') {
2572 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2573 if (xfrm_msg)
2574 strbuf_addstr(&header, xfrm_msg);
2575 must_show_header = 1;
2576 }
2577 else {
2578 if (one->mode != two->mode) {
2579 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2580 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2581 must_show_header = 1;
2582 }
2583 if (xfrm_msg)
2584 strbuf_addstr(&header, xfrm_msg);
2585
2586 /*
2587 * we do not run diff between different kind
2588 * of objects.
2589 */
2590 if ((one->mode ^ two->mode) & S_IFMT)
2591 goto free_ab_and_return;
2592 if (complete_rewrite &&
2593 (textconv_one || !diff_filespec_is_binary(one)) &&
2594 (textconv_two || !diff_filespec_is_binary(two))) {
2595 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2596 header.buf, header.len, 0);
2597 strbuf_reset(&header);
2598 emit_rewrite_diff(name_a, name_b, one, two,
2599 textconv_one, textconv_two, o);
2600 o->found_changes = 1;
2601 goto free_ab_and_return;
2602 }
2603 }
2604
2605 if (o->irreversible_delete && lbl[1][0] == '/') {
2606 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf,
2607 header.len, 0);
2608 strbuf_reset(&header);
2609 goto free_ab_and_return;
2610 } else if (!DIFF_OPT_TST(o, TEXT) &&
2611 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2612 (!textconv_two && diff_filespec_is_binary(two)) )) {
2613 struct strbuf sb = STRBUF_INIT;
2614 if (!one->data && !two->data &&
2615 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2616 !DIFF_OPT_TST(o, BINARY)) {
2617 if (!oidcmp(&one->oid, &two->oid)) {
2618 if (must_show_header)
2619 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2620 header.buf, header.len,
2621 0);
2622 goto free_ab_and_return;
2623 }
2624 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2625 header.buf, header.len, 0);
2626 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
2627 diff_line_prefix(o), lbl[0], lbl[1]);
2628 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
2629 sb.buf, sb.len, 0);
2630 strbuf_release(&sb);
2631 goto free_ab_and_return;
2632 }
2633 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2634 die("unable to read files to diff");
2635 /* Quite common confusing case */
2636 if (mf1.size == mf2.size &&
2637 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2638 if (must_show_header)
2639 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2640 header.buf, header.len, 0);
2641 goto free_ab_and_return;
2642 }
2643 emit_diff_symbol(o, DIFF_SYMBOL_HEADER, header.buf, header.len, 0);
2644 strbuf_reset(&header);
2645 if (DIFF_OPT_TST(o, BINARY))
2646 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2647 else {
2648 strbuf_addf(&sb, "%sBinary files %s and %s differ\n",
2649 diff_line_prefix(o), lbl[0], lbl[1]);
2650 emit_diff_symbol(o, DIFF_SYMBOL_BINARY_FILES,
2651 sb.buf, sb.len, 0);
2652 strbuf_release(&sb);
2653 }
2654 o->found_changes = 1;
2655 } else {
2656 /* Crazy xdl interfaces.. */
2657 const char *diffopts = getenv("GIT_DIFF_OPTS");
2658 const char *v;
2659 xpparam_t xpp;
2660 xdemitconf_t xecfg;
2661 struct emit_callback ecbdata;
2662 const struct userdiff_funcname *pe;
2663
2664 if (must_show_header) {
2665 emit_diff_symbol(o, DIFF_SYMBOL_HEADER,
2666 header.buf, header.len, 0);
2667 strbuf_reset(&header);
2668 }
2669
2670 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2671 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2672
2673 pe = diff_funcname_pattern(one);
2674 if (!pe)
2675 pe = diff_funcname_pattern(two);
2676
2677 memset(&xpp, 0, sizeof(xpp));
2678 memset(&xecfg, 0, sizeof(xecfg));
2679 memset(&ecbdata, 0, sizeof(ecbdata));
2680 ecbdata.label_path = lbl;
2681 ecbdata.color_diff = want_color(o->use_color);
2682 ecbdata.ws_rule = whitespace_rule(name_b);
2683 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2684 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2685 ecbdata.opt = o;
2686 ecbdata.header = header.len ? &header : NULL;
2687 xpp.flags = o->xdl_opts;
2688 xecfg.ctxlen = o->context;
2689 xecfg.interhunkctxlen = o->interhunkcontext;
2690 xecfg.flags = XDL_EMIT_FUNCNAMES;
2691 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2692 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2693 if (pe)
2694 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2695 if (!diffopts)
2696 ;
2697 else if (skip_prefix(diffopts, "--unified=", &v))
2698 xecfg.ctxlen = strtoul(v, NULL, 10);
2699 else if (skip_prefix(diffopts, "-u", &v))
2700 xecfg.ctxlen = strtoul(v, NULL, 10);
2701 if (o->word_diff)
2702 init_diff_words_data(&ecbdata, o, one, two);
2703 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2704 &xpp, &xecfg))
2705 die("unable to generate diff for %s", one->path);
2706 if (o->word_diff)
2707 free_diff_words_data(&ecbdata);
2708 if (textconv_one)
2709 free(mf1.ptr);
2710 if (textconv_two)
2711 free(mf2.ptr);
2712 xdiff_clear_find_func(&xecfg);
2713 }
2714
2715 free_ab_and_return:
2716 strbuf_release(&header);
2717 diff_free_filespec_data(one);
2718 diff_free_filespec_data(two);
2719 free(a_one);
2720 free(b_two);
2721 return;
2722 }
2723
2724 static void builtin_diffstat(const char *name_a, const char *name_b,
2725 struct diff_filespec *one,
2726 struct diff_filespec *two,
2727 struct diffstat_t *diffstat,
2728 struct diff_options *o,
2729 struct diff_filepair *p)
2730 {
2731 mmfile_t mf1, mf2;
2732 struct diffstat_file *data;
2733 int same_contents;
2734 int complete_rewrite = 0;
2735
2736 if (!DIFF_PAIR_UNMERGED(p)) {
2737 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2738 complete_rewrite = 1;
2739 }
2740
2741 data = diffstat_add(diffstat, name_a, name_b);
2742 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2743
2744 if (!one || !two) {
2745 data->is_unmerged = 1;
2746 return;
2747 }
2748
2749 same_contents = !oidcmp(&one->oid, &two->oid);
2750
2751 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2752 data->is_binary = 1;
2753 if (same_contents) {
2754 data->added = 0;
2755 data->deleted = 0;
2756 } else {
2757 data->added = diff_filespec_size(two);
2758 data->deleted = diff_filespec_size(one);
2759 }
2760 }
2761
2762 else if (complete_rewrite) {
2763 diff_populate_filespec(one, 0);
2764 diff_populate_filespec(two, 0);
2765 data->deleted = count_lines(one->data, one->size);
2766 data->added = count_lines(two->data, two->size);
2767 }
2768
2769 else if (!same_contents) {
2770 /* Crazy xdl interfaces.. */
2771 xpparam_t xpp;
2772 xdemitconf_t xecfg;
2773
2774 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2775 die("unable to read files to diff");
2776
2777 memset(&xpp, 0, sizeof(xpp));
2778 memset(&xecfg, 0, sizeof(xecfg));
2779 xpp.flags = o->xdl_opts;
2780 xecfg.ctxlen = o->context;
2781 xecfg.interhunkctxlen = o->interhunkcontext;
2782 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2783 &xpp, &xecfg))
2784 die("unable to generate diffstat for %s", one->path);
2785 }
2786
2787 diff_free_filespec_data(one);
2788 diff_free_filespec_data(two);
2789 }
2790
2791 static void builtin_checkdiff(const char *name_a, const char *name_b,
2792 const char *attr_path,
2793 struct diff_filespec *one,
2794 struct diff_filespec *two,
2795 struct diff_options *o)
2796 {
2797 mmfile_t mf1, mf2;
2798 struct checkdiff_t data;
2799
2800 if (!two)
2801 return;
2802
2803 memset(&data, 0, sizeof(data));
2804 data.filename = name_b ? name_b : name_a;
2805 data.lineno = 0;
2806 data.o = o;
2807 data.ws_rule = whitespace_rule(attr_path);
2808 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2809
2810 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2811 die("unable to read files to diff");
2812
2813 /*
2814 * All the other codepaths check both sides, but not checking
2815 * the "old" side here is deliberate. We are checking the newly
2816 * introduced changes, and as long as the "new" side is text, we
2817 * can and should check what it introduces.
2818 */
2819 if (diff_filespec_is_binary(two))
2820 goto free_and_return;
2821 else {
2822 /* Crazy xdl interfaces.. */
2823 xpparam_t xpp;
2824 xdemitconf_t xecfg;
2825
2826 memset(&xpp, 0, sizeof(xpp));
2827 memset(&xecfg, 0, sizeof(xecfg));
2828 xecfg.ctxlen = 1; /* at least one context line */
2829 xpp.flags = 0;
2830 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2831 &xpp, &xecfg))
2832 die("unable to generate checkdiff for %s", one->path);
2833
2834 if (data.ws_rule & WS_BLANK_AT_EOF) {
2835 struct emit_callback ecbdata;
2836 int blank_at_eof;
2837
2838 ecbdata.ws_rule = data.ws_rule;
2839 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2840 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2841
2842 if (blank_at_eof) {
2843 static char *err;
2844 if (!err)
2845 err = whitespace_error_string(WS_BLANK_AT_EOF);
2846 fprintf(o->file, "%s:%d: %s.\n",
2847 data.filename, blank_at_eof, err);
2848 data.status = 1; /* report errors */
2849 }
2850 }
2851 }
2852 free_and_return:
2853 diff_free_filespec_data(one);
2854 diff_free_filespec_data(two);
2855 if (data.status)
2856 DIFF_OPT_SET(o, CHECK_FAILED);
2857 }
2858
2859 struct diff_filespec *alloc_filespec(const char *path)
2860 {
2861 struct diff_filespec *spec;
2862
2863 FLEXPTR_ALLOC_STR(spec, path, path);
2864 spec->count = 1;
2865 spec->is_binary = -1;
2866 return spec;
2867 }
2868
2869 void free_filespec(struct diff_filespec *spec)
2870 {
2871 if (!--spec->count) {
2872 diff_free_filespec_data(spec);
2873 free(spec);
2874 }
2875 }
2876
2877 void fill_filespec(struct diff_filespec *spec, const struct object_id *oid,
2878 int oid_valid, unsigned short mode)
2879 {
2880 if (mode) {
2881 spec->mode = canon_mode(mode);
2882 oidcpy(&spec->oid, oid);
2883 spec->oid_valid = oid_valid;
2884 }
2885 }
2886
2887 /*
2888 * Given a name and sha1 pair, if the index tells us the file in
2889 * the work tree has that object contents, return true, so that
2890 * prepare_temp_file() does not have to inflate and extract.
2891 */
2892 static int reuse_worktree_file(const char *name, const struct object_id *oid, int want_file)
2893 {
2894 const struct cache_entry *ce;
2895 struct stat st;
2896 int pos, len;
2897
2898 /*
2899 * We do not read the cache ourselves here, because the
2900 * benchmark with my previous version that always reads cache
2901 * shows that it makes things worse for diff-tree comparing
2902 * two linux-2.6 kernel trees in an already checked out work
2903 * tree. This is because most diff-tree comparisons deal with
2904 * only a small number of files, while reading the cache is
2905 * expensive for a large project, and its cost outweighs the
2906 * savings we get by not inflating the object to a temporary
2907 * file. Practically, this code only helps when we are used
2908 * by diff-cache --cached, which does read the cache before
2909 * calling us.
2910 */
2911 if (!active_cache)
2912 return 0;
2913
2914 /* We want to avoid the working directory if our caller
2915 * doesn't need the data in a normal file, this system
2916 * is rather slow with its stat/open/mmap/close syscalls,
2917 * and the object is contained in a pack file. The pack
2918 * is probably already open and will be faster to obtain
2919 * the data through than the working directory. Loose
2920 * objects however would tend to be slower as they need
2921 * to be individually opened and inflated.
2922 */
2923 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(oid->hash))
2924 return 0;
2925
2926 /*
2927 * Similarly, if we'd have to convert the file contents anyway, that
2928 * makes the optimization not worthwhile.
2929 */
2930 if (!want_file && would_convert_to_git(&the_index, name))
2931 return 0;
2932
2933 len = strlen(name);
2934 pos = cache_name_pos(name, len);
2935 if (pos < 0)
2936 return 0;
2937 ce = active_cache[pos];
2938
2939 /*
2940 * This is not the sha1 we are looking for, or
2941 * unreusable because it is not a regular file.
2942 */
2943 if (oidcmp(oid, &ce->oid) || !S_ISREG(ce->ce_mode))
2944 return 0;
2945
2946 /*
2947 * If ce is marked as "assume unchanged", there is no
2948 * guarantee that work tree matches what we are looking for.
2949 */
2950 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2951 return 0;
2952
2953 /*
2954 * If ce matches the file in the work tree, we can reuse it.
2955 */
2956 if (ce_uptodate(ce) ||
2957 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2958 return 1;
2959
2960 return 0;
2961 }
2962
2963 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2964 {
2965 struct strbuf buf = STRBUF_INIT;
2966 char *dirty = "";
2967
2968 /* Are we looking at the work tree? */
2969 if (s->dirty_submodule)
2970 dirty = "-dirty";
2971
2972 strbuf_addf(&buf, "Subproject commit %s%s\n",
2973 oid_to_hex(&s->oid), dirty);
2974 s->size = buf.len;
2975 if (size_only) {
2976 s->data = NULL;
2977 strbuf_release(&buf);
2978 } else {
2979 s->data = strbuf_detach(&buf, NULL);
2980 s->should_free = 1;
2981 }
2982 return 0;
2983 }
2984
2985 /*
2986 * While doing rename detection and pickaxe operation, we may need to
2987 * grab the data for the blob (or file) for our own in-core comparison.
2988 * diff_filespec has data and size fields for this purpose.
2989 */
2990 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2991 {
2992 int size_only = flags & CHECK_SIZE_ONLY;
2993 int err = 0;
2994 /*
2995 * demote FAIL to WARN to allow inspecting the situation
2996 * instead of refusing.
2997 */
2998 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2999 ? SAFE_CRLF_WARN
3000 : safe_crlf);
3001
3002 if (!DIFF_FILE_VALID(s))
3003 die("internal error: asking to populate invalid file.");
3004 if (S_ISDIR(s->mode))
3005 return -1;
3006
3007 if (s->data)
3008 return 0;
3009
3010 if (size_only && 0 < s->size)
3011 return 0;
3012
3013 if (S_ISGITLINK(s->mode))
3014 return diff_populate_gitlink(s, size_only);
3015
3016 if (!s->oid_valid ||
3017 reuse_worktree_file(s->path, &s->oid, 0)) {
3018 struct strbuf buf = STRBUF_INIT;
3019 struct stat st;
3020 int fd;
3021
3022 if (lstat(s->path, &st) < 0) {
3023 if (errno == ENOENT) {
3024 err_empty:
3025 err = -1;
3026 empty:
3027 s->data = (char *)"";
3028 s->size = 0;
3029 return err;
3030 }
3031 }
3032 s->size = xsize_t(st.st_size);
3033 if (!s->size)
3034 goto empty;
3035 if (S_ISLNK(st.st_mode)) {
3036 struct strbuf sb = STRBUF_INIT;
3037
3038 if (strbuf_readlink(&sb, s->path, s->size))
3039 goto err_empty;
3040 s->size = sb.len;
3041 s->data = strbuf_detach(&sb, NULL);
3042 s->should_free = 1;
3043 return 0;
3044 }
3045
3046 /*
3047 * Even if the caller would be happy with getting
3048 * only the size, we cannot return early at this
3049 * point if the path requires us to run the content
3050 * conversion.
3051 */
3052 if (size_only && !would_convert_to_git(&the_index, s->path))
3053 return 0;
3054
3055 /*
3056 * Note: this check uses xsize_t(st.st_size) that may
3057 * not be the true size of the blob after it goes
3058 * through convert_to_git(). This may not strictly be
3059 * correct, but the whole point of big_file_threshold
3060 * and is_binary check being that we want to avoid
3061 * opening the file and inspecting the contents, this
3062 * is probably fine.
3063 */
3064 if ((flags & CHECK_BINARY) &&
3065 s->size > big_file_threshold && s->is_binary == -1) {
3066 s->is_binary = 1;
3067 return 0;
3068 }
3069 fd = open(s->path, O_RDONLY);
3070 if (fd < 0)
3071 goto err_empty;
3072 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
3073 close(fd);
3074 s->should_munmap = 1;
3075
3076 /*
3077 * Convert from working tree format to canonical git format
3078 */
3079 if (convert_to_git(&the_index, s->path, s->data, s->size, &buf, crlf_warn)) {
3080 size_t size = 0;
3081 munmap(s->data, s->size);
3082 s->should_munmap = 0;
3083 s->data = strbuf_detach(&buf, &size);
3084 s->size = size;
3085 s->should_free = 1;
3086 }
3087 }
3088 else {
3089 enum object_type type;
3090 if (size_only || (flags & CHECK_BINARY)) {
3091 type = sha1_object_info(s->oid.hash, &s->size);
3092 if (type < 0)
3093 die("unable to read %s",
3094 oid_to_hex(&s->oid));
3095 if (size_only)
3096 return 0;
3097 if (s->size > big_file_threshold && s->is_binary == -1) {
3098 s->is_binary = 1;
3099 return 0;
3100 }
3101 }
3102 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
3103 if (!s->data)
3104 die("unable to read %s", oid_to_hex(&s->oid));
3105 s->should_free = 1;
3106 }
3107 return 0;
3108 }
3109
3110 void diff_free_filespec_blob(struct diff_filespec *s)
3111 {
3112 if (s->should_free)
3113 free(s->data);
3114 else if (s->should_munmap)
3115 munmap(s->data, s->size);
3116
3117 if (s->should_free || s->should_munmap) {
3118 s->should_free = s->should_munmap = 0;
3119 s->data = NULL;
3120 }
3121 }
3122
3123 void diff_free_filespec_data(struct diff_filespec *s)
3124 {
3125 diff_free_filespec_blob(s);
3126 FREE_AND_NULL(s->cnt_data);
3127 }
3128
3129 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
3130 void *blob,
3131 unsigned long size,
3132 const struct object_id *oid,
3133 int mode)
3134 {
3135 int fd;
3136 struct strbuf buf = STRBUF_INIT;
3137 struct strbuf template = STRBUF_INIT;
3138 char *path_dup = xstrdup(path);
3139 const char *base = basename(path_dup);
3140
3141 /* Generate "XXXXXX_basename.ext" */
3142 strbuf_addstr(&template, "XXXXXX_");
3143 strbuf_addstr(&template, base);
3144
3145 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
3146 if (fd < 0)
3147 die_errno("unable to create temp-file");
3148 if (convert_to_working_tree(path,
3149 (const char *)blob, (size_t)size, &buf)) {
3150 blob = buf.buf;
3151 size = buf.len;
3152 }
3153 if (write_in_full(fd, blob, size) != size)
3154 die_errno("unable to write temp-file");
3155 close_tempfile(&temp->tempfile);
3156 temp->name = get_tempfile_path(&temp->tempfile);
3157 oid_to_hex_r(temp->hex, oid);
3158 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
3159 strbuf_release(&buf);
3160 strbuf_release(&template);
3161 free(path_dup);
3162 }
3163
3164 static struct diff_tempfile *prepare_temp_file(const char *name,
3165 struct diff_filespec *one)
3166 {
3167 struct diff_tempfile *temp = claim_diff_tempfile();
3168
3169 if (!DIFF_FILE_VALID(one)) {
3170 not_a_valid_file:
3171 /* A '-' entry produces this for file-2, and
3172 * a '+' entry produces this for file-1.
3173 */
3174 temp->name = "/dev/null";
3175 xsnprintf(temp->hex, sizeof(temp->hex), ".");
3176 xsnprintf(temp->mode, sizeof(temp->mode), ".");
3177 return temp;
3178 }
3179
3180 if (!S_ISGITLINK(one->mode) &&
3181 (!one->oid_valid ||
3182 reuse_worktree_file(name, &one->oid, 1))) {
3183 struct stat st;
3184 if (lstat(name, &st) < 0) {
3185 if (errno == ENOENT)
3186 goto not_a_valid_file;
3187 die_errno("stat(%s)", name);
3188 }
3189 if (S_ISLNK(st.st_mode)) {
3190 struct strbuf sb = STRBUF_INIT;
3191 if (strbuf_readlink(&sb, name, st.st_size) < 0)
3192 die_errno("readlink(%s)", name);
3193 prep_temp_blob(name, temp, sb.buf, sb.len,
3194 (one->oid_valid ?
3195 &one->oid : &null_oid),
3196 (one->oid_valid ?
3197 one->mode : S_IFLNK));
3198 strbuf_release(&sb);
3199 }
3200 else {
3201 /* we can borrow from the file in the work tree */
3202 temp->name = name;
3203 if (!one->oid_valid)
3204 oid_to_hex_r(temp->hex, &null_oid);
3205 else
3206 oid_to_hex_r(temp->hex, &one->oid);
3207 /* Even though we may sometimes borrow the
3208 * contents from the work tree, we always want
3209 * one->mode. mode is trustworthy even when
3210 * !(one->oid_valid), as long as
3211 * DIFF_FILE_VALID(one).
3212 */
3213 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
3214 }
3215 return temp;
3216 }
3217 else {
3218 if (diff_populate_filespec(one, 0))
3219 die("cannot read data blob for %s", one->path);
3220 prep_temp_blob(name, temp, one->data, one->size,
3221 &one->oid, one->mode);
3222 }
3223 return temp;
3224 }
3225
3226 static void add_external_diff_name(struct argv_array *argv,
3227 const char *name,
3228 struct diff_filespec *df)
3229 {
3230 struct diff_tempfile *temp = prepare_temp_file(name, df);
3231 argv_array_push(argv, temp->name);
3232 argv_array_push(argv, temp->hex);
3233 argv_array_push(argv, temp->mode);
3234 }
3235
3236 /* An external diff command takes:
3237 *
3238 * diff-cmd name infile1 infile1-sha1 infile1-mode \
3239 * infile2 infile2-sha1 infile2-mode [ rename-to ]
3240 *
3241 */
3242 static void run_external_diff(const char *pgm,
3243 const char *name,
3244 const char *other,
3245 struct diff_filespec *one,
3246 struct diff_filespec *two,
3247 const char *xfrm_msg,
3248 int complete_rewrite,
3249 struct diff_options *o)
3250 {
3251 struct argv_array argv = ARGV_ARRAY_INIT;
3252 struct argv_array env = ARGV_ARRAY_INIT;
3253 struct diff_queue_struct *q = &diff_queued_diff;
3254
3255 argv_array_push(&argv, pgm);
3256 argv_array_push(&argv, name);
3257
3258 if (one && two) {
3259 add_external_diff_name(&argv, name, one);
3260 if (!other)
3261 add_external_diff_name(&argv, name, two);
3262 else {
3263 add_external_diff_name(&argv, other, two);
3264 argv_array_push(&argv, other);
3265 argv_array_push(&argv, xfrm_msg);
3266 }
3267 }
3268
3269 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3270 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3271
3272 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3273 die(_("external diff died, stopping at %s"), name);
3274
3275 remove_tempfile();
3276 argv_array_clear(&argv);
3277 argv_array_clear(&env);
3278 }
3279
3280 static int similarity_index(struct diff_filepair *p)
3281 {
3282 return p->score * 100 / MAX_SCORE;
3283 }
3284
3285 static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
3286 {
3287 if (startup_info->have_repository)
3288 return find_unique_abbrev(oid->hash, abbrev);
3289 else {
3290 char *hex = oid_to_hex(oid);
3291 if (abbrev < 0)
3292 abbrev = FALLBACK_DEFAULT_ABBREV;
3293 if (abbrev > GIT_SHA1_HEXSZ)
3294 die("BUG: oid abbreviation out of range: %d", abbrev);
3295 if (abbrev)
3296 hex[abbrev] = '\0';
3297 return hex;
3298 }
3299 }
3300
3301 static void fill_metainfo(struct strbuf *msg,
3302 const char *name,
3303 const char *other,
3304 struct diff_filespec *one,
3305 struct diff_filespec *two,
3306 struct diff_options *o,
3307 struct diff_filepair *p,
3308 int *must_show_header,
3309 int use_color)
3310 {
3311 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3312 const char *reset = diff_get_color(use_color, DIFF_RESET);
3313 const char *line_prefix = diff_line_prefix(o);
3314
3315 *must_show_header = 1;
3316 strbuf_init(msg, PATH_MAX * 2 + 300);
3317 switch (p->status) {
3318 case DIFF_STATUS_COPIED:
3319 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3320 line_prefix, set, similarity_index(p));
3321 strbuf_addf(msg, "%s\n%s%scopy from ",
3322 reset, line_prefix, set);
3323 quote_c_style(name, msg, NULL, 0);
3324 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3325 quote_c_style(other, msg, NULL, 0);
3326 strbuf_addf(msg, "%s\n", reset);
3327 break;
3328 case DIFF_STATUS_RENAMED:
3329 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3330 line_prefix, set, similarity_index(p));
3331 strbuf_addf(msg, "%s\n%s%srename from ",
3332 reset, line_prefix, set);
3333 quote_c_style(name, msg, NULL, 0);
3334 strbuf_addf(msg, "%s\n%s%srename to ",
3335 reset, line_prefix, set);
3336 quote_c_style(other, msg, NULL, 0);
3337 strbuf_addf(msg, "%s\n", reset);
3338 break;
3339 case DIFF_STATUS_MODIFIED:
3340 if (p->score) {
3341 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3342 line_prefix,
3343 set, similarity_index(p), reset);
3344 break;
3345 }
3346 /* fallthru */
3347 default:
3348 *must_show_header = 0;
3349 }
3350 if (one && two && oidcmp(&one->oid, &two->oid)) {
3351 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3352
3353 if (DIFF_OPT_TST(o, BINARY)) {
3354 mmfile_t mf;
3355 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3356 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3357 abbrev = 40;
3358 }
3359 strbuf_addf(msg, "%s%sindex %s..%s", line_prefix, set,
3360 diff_abbrev_oid(&one->oid, abbrev),
3361 diff_abbrev_oid(&two->oid, abbrev));
3362 if (one->mode == two->mode)
3363 strbuf_addf(msg, " %06o", one->mode);
3364 strbuf_addf(msg, "%s\n", reset);
3365 }
3366 }
3367
3368 static void run_diff_cmd(const char *pgm,
3369 const char *name,
3370 const char *other,
3371 const char *attr_path,
3372 struct diff_filespec *one,
3373 struct diff_filespec *two,
3374 struct strbuf *msg,
3375 struct diff_options *o,
3376 struct diff_filepair *p)
3377 {
3378 const char *xfrm_msg = NULL;
3379 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3380 int must_show_header = 0;
3381
3382
3383 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3384 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3385 if (drv && drv->external)
3386 pgm = drv->external;
3387 }
3388
3389 if (msg) {
3390 /*
3391 * don't use colors when the header is intended for an
3392 * external diff driver
3393 */
3394 fill_metainfo(msg, name, other, one, two, o, p,
3395 &must_show_header,
3396 want_color(o->use_color) && !pgm);
3397 xfrm_msg = msg->len ? msg->buf : NULL;
3398 }
3399
3400 if (pgm) {
3401 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3402 complete_rewrite, o);
3403 return;
3404 }
3405 if (one && two)
3406 builtin_diff(name, other ? other : name,
3407 one, two, xfrm_msg, must_show_header,
3408 o, complete_rewrite);
3409 else
3410 fprintf(o->file, "* Unmerged path %s\n", name);
3411 }
3412
3413 static void diff_fill_oid_info(struct diff_filespec *one)
3414 {
3415 if (DIFF_FILE_VALID(one)) {
3416 if (!one->oid_valid) {
3417 struct stat st;
3418 if (one->is_stdin) {
3419 oidclr(&one->oid);
3420 return;
3421 }
3422 if (lstat(one->path, &st) < 0)
3423 die_errno("stat '%s'", one->path);
3424 if (index_path(one->oid.hash, one->path, &st, 0))
3425 die("cannot hash %s", one->path);
3426 }
3427 }
3428 else
3429 oidclr(&one->oid);
3430 }
3431
3432 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3433 {
3434 /* Strip the prefix but do not molest /dev/null and absolute paths */
3435 if (*namep && **namep != '/') {
3436 *namep += prefix_length;
3437 if (**namep == '/')
3438 ++*namep;
3439 }
3440 if (*otherp && **otherp != '/') {
3441 *otherp += prefix_length;
3442 if (**otherp == '/')
3443 ++*otherp;
3444 }
3445 }
3446
3447 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3448 {
3449 const char *pgm = external_diff();
3450 struct strbuf msg;
3451 struct diff_filespec *one = p->one;
3452 struct diff_filespec *two = p->two;
3453 const char *name;
3454 const char *other;
3455 const char *attr_path;
3456
3457 name = one->path;
3458 other = (strcmp(name, two->path) ? two->path : NULL);
3459 attr_path = name;
3460 if (o->prefix_length)
3461 strip_prefix(o->prefix_length, &name, &other);
3462
3463 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3464 pgm = NULL;
3465
3466 if (DIFF_PAIR_UNMERGED(p)) {
3467 run_diff_cmd(pgm, name, NULL, attr_path,
3468 NULL, NULL, NULL, o, p);
3469 return;
3470 }
3471
3472 diff_fill_oid_info(one);
3473 diff_fill_oid_info(two);
3474
3475 if (!pgm &&
3476 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3477 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3478 /*
3479 * a filepair that changes between file and symlink
3480 * needs to be split into deletion and creation.
3481 */
3482 struct diff_filespec *null = alloc_filespec(two->path);
3483 run_diff_cmd(NULL, name, other, attr_path,
3484 one, null, &msg, o, p);
3485 free(null);
3486 strbuf_release(&msg);
3487
3488 null = alloc_filespec(one->path);
3489 run_diff_cmd(NULL, name, other, attr_path,
3490 null, two, &msg, o, p);
3491 free(null);
3492 }
3493 else
3494 run_diff_cmd(pgm, name, other, attr_path,
3495 one, two, &msg, o, p);
3496
3497 strbuf_release(&msg);
3498 }
3499
3500 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3501 struct diffstat_t *diffstat)
3502 {
3503 const char *name;
3504 const char *other;
3505
3506 if (DIFF_PAIR_UNMERGED(p)) {
3507 /* unmerged */
3508 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3509 return;
3510 }
3511
3512 name = p->one->path;
3513 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3514
3515 if (o->prefix_length)
3516 strip_prefix(o->prefix_length, &name, &other);
3517
3518 diff_fill_oid_info(p->one);
3519 diff_fill_oid_info(p->two);
3520
3521 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3522 }
3523
3524 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3525 {
3526 const char *name;
3527 const char *other;
3528 const char *attr_path;
3529
3530 if (DIFF_PAIR_UNMERGED(p)) {
3531 /* unmerged */
3532 return;
3533 }
3534
3535 name = p->one->path;
3536 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3537 attr_path = other ? other : name;
3538
3539 if (o->prefix_length)
3540 strip_prefix(o->prefix_length, &name, &other);
3541
3542 diff_fill_oid_info(p->one);
3543 diff_fill_oid_info(p->two);
3544
3545 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3546 }
3547
3548 void diff_setup(struct diff_options *options)
3549 {
3550 memcpy(options, &default_diff_options, sizeof(*options));
3551
3552 options->file = stdout;
3553
3554 options->abbrev = DEFAULT_ABBREV;
3555 options->line_termination = '\n';
3556 options->break_opt = -1;
3557 options->rename_limit = -1;
3558 options->dirstat_permille = diff_dirstat_permille_default;
3559 options->context = diff_context_default;
3560 options->interhunkcontext = diff_interhunk_context_default;
3561 options->ws_error_highlight = ws_error_highlight_default;
3562 DIFF_OPT_SET(options, RENAME_EMPTY);
3563
3564 /* pathchange left =NULL by default */
3565 options->change = diff_change;
3566 options->add_remove = diff_addremove;
3567 options->use_color = diff_use_color_default;
3568 options->detect_rename = diff_detect_rename_default;
3569 options->xdl_opts |= diff_algorithm;
3570 if (diff_indent_heuristic)
3571 DIFF_XDL_SET(options, INDENT_HEURISTIC);
3572
3573 options->orderfile = diff_order_file_cfg;
3574
3575 if (diff_no_prefix) {
3576 options->a_prefix = options->b_prefix = "";
3577 } else if (!diff_mnemonic_prefix) {
3578 options->a_prefix = "a/";
3579 options->b_prefix = "b/";
3580 }
3581 }
3582
3583 void diff_setup_done(struct diff_options *options)
3584 {
3585 int count = 0;
3586
3587 if (options->set_default)
3588 options->set_default(options);
3589
3590 if (options->output_format & DIFF_FORMAT_NAME)
3591 count++;
3592 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3593 count++;
3594 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3595 count++;
3596 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3597 count++;
3598 if (count > 1)
3599 die(_("--name-only, --name-status, --check and -s are mutually exclusive"));
3600
3601 /*
3602 * Most of the time we can say "there are changes"
3603 * only by checking if there are changed paths, but
3604 * --ignore-whitespace* options force us to look
3605 * inside contents.
3606 */
3607
3608 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3609 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3610 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3611 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3612 else
3613 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3614
3615 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3616 options->detect_rename = DIFF_DETECT_COPY;
3617
3618 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3619 options->prefix = NULL;
3620 if (options->prefix)
3621 options->prefix_length = strlen(options->prefix);
3622 else
3623 options->prefix_length = 0;
3624
3625 if (options->output_format & (DIFF_FORMAT_NAME |
3626 DIFF_FORMAT_NAME_STATUS |
3627 DIFF_FORMAT_CHECKDIFF |
3628 DIFF_FORMAT_NO_OUTPUT))
3629 options->output_format &= ~(DIFF_FORMAT_RAW |
3630 DIFF_FORMAT_NUMSTAT |
3631 DIFF_FORMAT_DIFFSTAT |
3632 DIFF_FORMAT_SHORTSTAT |
3633 DIFF_FORMAT_DIRSTAT |
3634 DIFF_FORMAT_SUMMARY |
3635 DIFF_FORMAT_PATCH);
3636
3637 /*
3638 * These cases always need recursive; we do not drop caller-supplied
3639 * recursive bits for other formats here.
3640 */
3641 if (options->output_format & (DIFF_FORMAT_PATCH |
3642 DIFF_FORMAT_NUMSTAT |
3643 DIFF_FORMAT_DIFFSTAT |
3644 DIFF_FORMAT_SHORTSTAT |
3645 DIFF_FORMAT_DIRSTAT |
3646 DIFF_FORMAT_SUMMARY |
3647 DIFF_FORMAT_CHECKDIFF))
3648 DIFF_OPT_SET(options, RECURSIVE);
3649 /*
3650 * Also pickaxe would not work very well if you do not say recursive
3651 */
3652 if (options->pickaxe)
3653 DIFF_OPT_SET(options, RECURSIVE);
3654 /*
3655 * When patches are generated, submodules diffed against the work tree
3656 * must be checked for dirtiness too so it can be shown in the output
3657 */
3658 if (options->output_format & DIFF_FORMAT_PATCH)
3659 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3660
3661 if (options->detect_rename && options->rename_limit < 0)
3662 options->rename_limit = diff_rename_limit_default;
3663 if (options->setup & DIFF_SETUP_USE_CACHE) {
3664 if (!active_cache)
3665 /* read-cache does not die even when it fails
3666 * so it is safe for us to do this here. Also
3667 * it does not smudge active_cache or active_nr
3668 * when it fails, so we do not have to worry about
3669 * cleaning it up ourselves either.
3670 */
3671 read_cache();
3672 }
3673 if (40 < options->abbrev)
3674 options->abbrev = 40; /* full */
3675
3676 /*
3677 * It does not make sense to show the first hit we happened
3678 * to have found. It does not make sense not to return with
3679 * exit code in such a case either.
3680 */
3681 if (DIFF_OPT_TST(options, QUICK)) {
3682 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3683 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3684 }
3685
3686 options->diff_path_counter = 0;
3687
3688 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3689 die(_("--follow requires exactly one pathspec"));
3690 }
3691
3692 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3693 {
3694 char c, *eq;
3695 int len;
3696
3697 if (*arg != '-')
3698 return 0;
3699 c = *++arg;
3700 if (!c)
3701 return 0;
3702 if (c == arg_short) {
3703 c = *++arg;
3704 if (!c)
3705 return 1;
3706 if (val && isdigit(c)) {
3707 char *end;
3708 int n = strtoul(arg, &end, 10);
3709 if (*end)
3710 return 0;
3711 *val = n;
3712 return 1;
3713 }
3714 return 0;
3715 }
3716 if (c != '-')
3717 return 0;
3718 arg++;
3719 eq = strchrnul(arg, '=');
3720 len = eq - arg;
3721 if (!len || strncmp(arg, arg_long, len))
3722 return 0;
3723 if (*eq) {
3724 int n;
3725 char *end;
3726 if (!isdigit(*++eq))
3727 return 0;
3728 n = strtoul(eq, &end, 10);
3729 if (*end)
3730 return 0;
3731 *val = n;
3732 }
3733 return 1;
3734 }
3735
3736 static int diff_scoreopt_parse(const char *opt);
3737
3738 static inline int short_opt(char opt, const char **argv,
3739 const char **optarg)
3740 {
3741 const char *arg = argv[0];
3742 if (arg[0] != '-' || arg[1] != opt)
3743 return 0;
3744 if (arg[2] != '\0') {
3745 *optarg = arg + 2;
3746 return 1;
3747 }
3748 if (!argv[1])
3749 die("Option '%c' requires a value", opt);
3750 *optarg = argv[1];
3751 return 2;
3752 }
3753
3754 int parse_long_opt(const char *opt, const char **argv,
3755 const char **optarg)
3756 {
3757 const char *arg = argv[0];
3758 if (!skip_prefix(arg, "--", &arg))
3759 return 0;
3760 if (!skip_prefix(arg, opt, &arg))
3761 return 0;
3762 if (*arg == '=') { /* stuck form: --option=value */
3763 *optarg = arg + 1;
3764 return 1;
3765 }
3766 if (*arg != '\0')
3767 return 0;
3768 /* separate form: --option value */
3769 if (!argv[1])
3770 die("Option '--%s' requires a value", opt);
3771 *optarg = argv[1];
3772 return 2;
3773 }
3774
3775 static int stat_opt(struct diff_options *options, const char **av)
3776 {
3777 const char *arg = av[0];
3778 char *end;
3779 int width = options->stat_width;
3780 int name_width = options->stat_name_width;
3781 int graph_width = options->stat_graph_width;
3782 int count = options->stat_count;
3783 int argcount = 1;
3784
3785 if (!skip_prefix(arg, "--stat", &arg))
3786 die("BUG: stat option does not begin with --stat: %s", arg);
3787 end = (char *)arg;
3788
3789 switch (*arg) {
3790 case '-':
3791 if (skip_prefix(arg, "-width", &arg)) {
3792 if (*arg == '=')
3793 width = strtoul(arg + 1, &end, 10);
3794 else if (!*arg && !av[1])
3795 die_want_option("--stat-width");
3796 else if (!*arg) {
3797 width = strtoul(av[1], &end, 10);
3798 argcount = 2;
3799 }
3800 } else if (skip_prefix(arg, "-name-width", &arg)) {
3801 if (*arg == '=')
3802 name_width = strtoul(arg + 1, &end, 10);
3803 else if (!*arg && !av[1])
3804 die_want_option("--stat-name-width");
3805 else if (!*arg) {
3806 name_width = strtoul(av[1], &end, 10);
3807 argcount = 2;
3808 }
3809 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3810 if (*arg == '=')
3811 graph_width = strtoul(arg + 1, &end, 10);
3812 else if (!*arg && !av[1])
3813 die_want_option("--stat-graph-width");
3814 else if (!*arg) {
3815 graph_width = strtoul(av[1], &end, 10);
3816 argcount = 2;
3817 }
3818 } else if (skip_prefix(arg, "-count", &arg)) {
3819 if (*arg == '=')
3820 count = strtoul(arg + 1, &end, 10);
3821 else if (!*arg && !av[1])
3822 die_want_option("--stat-count");
3823 else if (!*arg) {
3824 count = strtoul(av[1], &end, 10);
3825 argcount = 2;
3826 }
3827 }
3828 break;
3829 case '=':
3830 width = strtoul(arg+1, &end, 10);
3831 if (*end == ',')
3832 name_width = strtoul(end+1, &end, 10);
3833 if (*end == ',')
3834 count = strtoul(end+1, &end, 10);
3835 }
3836
3837 /* Important! This checks all the error cases! */
3838 if (*end)
3839 return 0;
3840 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3841 options->stat_name_width = name_width;
3842 options->stat_graph_width = graph_width;
3843 options->stat_width = width;
3844 options->stat_count = count;
3845 return argcount;
3846 }
3847
3848 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3849 {
3850 struct strbuf errmsg = STRBUF_INIT;
3851 if (parse_dirstat_params(options, params, &errmsg))
3852 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3853 errmsg.buf);
3854 strbuf_release(&errmsg);
3855 /*
3856 * The caller knows a dirstat-related option is given from the command
3857 * line; allow it to say "return this_function();"
3858 */
3859 options->output_format |= DIFF_FORMAT_DIRSTAT;
3860 return 1;
3861 }
3862
3863 static int parse_submodule_opt(struct diff_options *options, const char *value)
3864 {
3865 if (parse_submodule_params(options, value))
3866 die(_("Failed to parse --submodule option parameter: '%s'"),
3867 value);
3868 return 1;
3869 }
3870
3871 static const char diff_status_letters[] = {
3872 DIFF_STATUS_ADDED,
3873 DIFF_STATUS_COPIED,
3874 DIFF_STATUS_DELETED,
3875 DIFF_STATUS_MODIFIED,
3876 DIFF_STATUS_RENAMED,
3877 DIFF_STATUS_TYPE_CHANGED,
3878 DIFF_STATUS_UNKNOWN,
3879 DIFF_STATUS_UNMERGED,
3880 DIFF_STATUS_FILTER_AON,
3881 DIFF_STATUS_FILTER_BROKEN,
3882 '\0',
3883 };
3884
3885 static unsigned int filter_bit['Z' + 1];
3886
3887 static void prepare_filter_bits(void)
3888 {
3889 int i;
3890
3891 if (!filter_bit[DIFF_STATUS_ADDED]) {
3892 for (i = 0; diff_status_letters[i]; i++)
3893 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3894 }
3895 }
3896
3897 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3898 {
3899 return opt->filter & filter_bit[(int) status];
3900 }
3901
3902 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3903 {
3904 int i, optch;
3905
3906 prepare_filter_bits();
3907
3908 /*
3909 * If there is a negation e.g. 'd' in the input, and we haven't
3910 * initialized the filter field with another --diff-filter, start
3911 * from full set of bits, except for AON.
3912 */
3913 if (!opt->filter) {
3914 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3915 if (optch < 'a' || 'z' < optch)
3916 continue;
3917 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3918 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3919 break;
3920 }
3921 }
3922
3923 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3924 unsigned int bit;
3925 int negate;
3926
3927 if ('a' <= optch && optch <= 'z') {
3928 negate = 1;
3929 optch = toupper(optch);
3930 } else {
3931 negate = 0;
3932 }
3933
3934 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3935 if (!bit)
3936 return optarg[i];
3937 if (negate)
3938 opt->filter &= ~bit;
3939 else
3940 opt->filter |= bit;
3941 }
3942 return 0;
3943 }
3944
3945 static void enable_patch_output(int *fmt) {
3946 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3947 *fmt |= DIFF_FORMAT_PATCH;
3948 }
3949
3950 static int parse_ws_error_highlight_opt(struct diff_options *opt, const char *arg)
3951 {
3952 int val = parse_ws_error_highlight(arg);
3953
3954 if (val < 0) {
3955 error("unknown value after ws-error-highlight=%.*s",
3956 -1 - val, arg);
3957 return 0;
3958 }
3959 opt->ws_error_highlight = val;
3960 return 1;
3961 }
3962
3963 int diff_opt_parse(struct diff_options *options,
3964 const char **av, int ac, const char *prefix)
3965 {
3966 const char *arg = av[0];
3967 const char *optarg;
3968 int argcount;
3969
3970 if (!prefix)
3971 prefix = "";
3972
3973 /* Output format options */
3974 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3975 || opt_arg(arg, 'U', "unified", &options->context))
3976 enable_patch_output(&options->output_format);
3977 else if (!strcmp(arg, "--raw"))
3978 options->output_format |= DIFF_FORMAT_RAW;
3979 else if (!strcmp(arg, "--patch-with-raw")) {
3980 enable_patch_output(&options->output_format);
3981 options->output_format |= DIFF_FORMAT_RAW;
3982 } else if (!strcmp(arg, "--numstat"))
3983 options->output_format |= DIFF_FORMAT_NUMSTAT;
3984 else if (!strcmp(arg, "--shortstat"))
3985 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3986 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3987 return parse_dirstat_opt(options, "");
3988 else if (skip_prefix(arg, "-X", &arg))
3989 return parse_dirstat_opt(options, arg);
3990 else if (skip_prefix(arg, "--dirstat=", &arg))
3991 return parse_dirstat_opt(options, arg);
3992 else if (!strcmp(arg, "--cumulative"))
3993 return parse_dirstat_opt(options, "cumulative");
3994 else if (!strcmp(arg, "--dirstat-by-file"))
3995 return parse_dirstat_opt(options, "files");
3996 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3997 parse_dirstat_opt(options, "files");
3998 return parse_dirstat_opt(options, arg);
3999 }
4000 else if (!strcmp(arg, "--check"))
4001 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4002 else if (!strcmp(arg, "--summary"))
4003 options->output_format |= DIFF_FORMAT_SUMMARY;
4004 else if (!strcmp(arg, "--patch-with-stat")) {
4005 enable_patch_output(&options->output_format);
4006 options->output_format |= DIFF_FORMAT_DIFFSTAT;
4007 } else if (!strcmp(arg, "--name-only"))
4008 options->output_format |= DIFF_FORMAT_NAME;
4009 else if (!strcmp(arg, "--name-status"))
4010 options->output_format |= DIFF_FORMAT_NAME_STATUS;
4011 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
4012 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4013 else if (starts_with(arg, "--stat"))
4014 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4015 return stat_opt(options, av);
4016
4017 /* renames options */
4018 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
4019 !strcmp(arg, "--break-rewrites")) {
4020 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
4021 return error("invalid argument to -B: %s", arg+2);
4022 }
4023 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
4024 !strcmp(arg, "--find-renames")) {
4025 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4026 return error("invalid argument to -M: %s", arg+2);
4027 options->detect_rename = DIFF_DETECT_RENAME;
4028 }
4029 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
4030 options->irreversible_delete = 1;
4031 }
4032 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
4033 !strcmp(arg, "--find-copies")) {
4034 if (options->detect_rename == DIFF_DETECT_COPY)
4035 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
4036 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
4037 return error("invalid argument to -C: %s", arg+2);
4038 options->detect_rename = DIFF_DETECT_COPY;
4039 }
4040 else if (!strcmp(arg, "--no-renames"))
4041 options->detect_rename = 0;
4042 else if (!strcmp(arg, "--rename-empty"))
4043 DIFF_OPT_SET(options, RENAME_EMPTY);
4044 else if (!strcmp(arg, "--no-rename-empty"))
4045 DIFF_OPT_CLR(options, RENAME_EMPTY);
4046 else if (!strcmp(arg, "--relative"))
4047 DIFF_OPT_SET(options, RELATIVE_NAME);
4048 else if (skip_prefix(arg, "--relative=", &arg)) {
4049 DIFF_OPT_SET(options, RELATIVE_NAME);
4050 options->prefix = arg;
4051 }
4052
4053 /* xdiff options */
4054 else if (!strcmp(arg, "--minimal"))
4055 DIFF_XDL_SET(options, NEED_MINIMAL);
4056 else if (!strcmp(arg, "--no-minimal"))
4057 DIFF_XDL_CLR(options, NEED_MINIMAL);
4058 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
4059 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
4060 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
4061 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
4062 else if (!strcmp(arg, "--ignore-space-at-eol"))
4063 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
4064 else if (!strcmp(arg, "--ignore-blank-lines"))
4065 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
4066 else if (!strcmp(arg, "--indent-heuristic"))
4067 DIFF_XDL_SET(options, INDENT_HEURISTIC);
4068 else if (!strcmp(arg, "--no-indent-heuristic"))
4069 DIFF_XDL_CLR(options, INDENT_HEURISTIC);
4070 else if (!strcmp(arg, "--patience"))
4071 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
4072 else if (!strcmp(arg, "--histogram"))
4073 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
4074 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
4075 long value = parse_algorithm_value(optarg);
4076 if (value < 0)
4077 return error("option diff-algorithm accepts \"myers\", "
4078 "\"minimal\", \"patience\" and \"histogram\"");
4079 /* clear out previous settings */
4080 DIFF_XDL_CLR(options, NEED_MINIMAL);
4081 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
4082 options->xdl_opts |= value;
4083 return argcount;
4084 }
4085
4086 /* flags options */
4087 else if (!strcmp(arg, "--binary")) {
4088 enable_patch_output(&options->output_format);
4089 DIFF_OPT_SET(options, BINARY);
4090 }
4091 else if (!strcmp(arg, "--full-index"))
4092 DIFF_OPT_SET(options, FULL_INDEX);
4093 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
4094 DIFF_OPT_SET(options, TEXT);
4095 else if (!strcmp(arg, "-R"))
4096 DIFF_OPT_SET(options, REVERSE_DIFF);
4097 else if (!strcmp(arg, "--find-copies-harder"))
4098 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
4099 else if (!strcmp(arg, "--follow"))
4100 DIFF_OPT_SET(options, FOLLOW_RENAMES);
4101 else if (!strcmp(arg, "--no-follow")) {
4102 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
4103 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
4104 } else if (!strcmp(arg, "--color"))
4105 options->use_color = 1;
4106 else if (skip_prefix(arg, "--color=", &arg)) {
4107 int value = git_config_colorbool(NULL, arg);
4108 if (value < 0)
4109 return error("option `color' expects \"always\", \"auto\", or \"never\"");
4110 options->use_color = value;
4111 }
4112 else if (!strcmp(arg, "--no-color"))
4113 options->use_color = 0;
4114 else if (!strcmp(arg, "--color-words")) {
4115 options->use_color = 1;
4116 options->word_diff = DIFF_WORDS_COLOR;
4117 }
4118 else if (skip_prefix(arg, "--color-words=", &arg)) {
4119 options->use_color = 1;
4120 options->word_diff = DIFF_WORDS_COLOR;
4121 options->word_regex = arg;
4122 }
4123 else if (!strcmp(arg, "--word-diff")) {
4124 if (options->word_diff == DIFF_WORDS_NONE)
4125 options->word_diff = DIFF_WORDS_PLAIN;
4126 }
4127 else if (skip_prefix(arg, "--word-diff=", &arg)) {
4128 if (!strcmp(arg, "plain"))
4129 options->word_diff = DIFF_WORDS_PLAIN;
4130 else if (!strcmp(arg, "color")) {
4131 options->use_color = 1;
4132 options->word_diff = DIFF_WORDS_COLOR;
4133 }
4134 else if (!strcmp(arg, "porcelain"))
4135 options->word_diff = DIFF_WORDS_PORCELAIN;
4136 else if (!strcmp(arg, "none"))
4137 options->word_diff = DIFF_WORDS_NONE;
4138 else
4139 die("bad --word-diff argument: %s", arg);
4140 }
4141 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
4142 if (options->word_diff == DIFF_WORDS_NONE)
4143 options->word_diff = DIFF_WORDS_PLAIN;
4144 options->word_regex = optarg;
4145 return argcount;
4146 }
4147 else if (!strcmp(arg, "--exit-code"))
4148 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
4149 else if (!strcmp(arg, "--quiet"))
4150 DIFF_OPT_SET(options, QUICK);
4151 else if (!strcmp(arg, "--ext-diff"))
4152 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
4153 else if (!strcmp(arg, "--no-ext-diff"))
4154 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
4155 else if (!strcmp(arg, "--textconv"))
4156 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
4157 else if (!strcmp(arg, "--no-textconv"))
4158 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
4159 else if (!strcmp(arg, "--ignore-submodules")) {
4160 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
4161 handle_ignore_submodules_arg(options, "all");
4162 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
4163 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
4164 handle_ignore_submodules_arg(options, arg);
4165 } else if (!strcmp(arg, "--submodule"))
4166 options->submodule_format = DIFF_SUBMODULE_LOG;
4167 else if (skip_prefix(arg, "--submodule=", &arg))
4168 return parse_submodule_opt(options, arg);
4169 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
4170 return parse_ws_error_highlight_opt(options, arg);
4171 else if (!strcmp(arg, "--ita-invisible-in-index"))
4172 options->ita_invisible_in_index = 1;
4173 else if (!strcmp(arg, "--ita-visible-in-index"))
4174 options->ita_invisible_in_index = 0;
4175
4176 /* misc options */
4177 else if (!strcmp(arg, "-z"))
4178 options->line_termination = 0;
4179 else if ((argcount = short_opt('l', av, &optarg))) {
4180 options->rename_limit = strtoul(optarg, NULL, 10);
4181 return argcount;
4182 }
4183 else if ((argcount = short_opt('S', av, &optarg))) {
4184 options->pickaxe = optarg;
4185 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
4186 return argcount;
4187 } else if ((argcount = short_opt('G', av, &optarg))) {
4188 options->pickaxe = optarg;
4189 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
4190 return argcount;
4191 }
4192 else if (!strcmp(arg, "--pickaxe-all"))
4193 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
4194 else if (!strcmp(arg, "--pickaxe-regex"))
4195 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
4196 else if ((argcount = short_opt('O', av, &optarg))) {
4197 options->orderfile = prefix_filename(prefix, optarg);
4198 return argcount;
4199 }
4200 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
4201 int offending = parse_diff_filter_opt(optarg, options);
4202 if (offending)
4203 die("unknown change class '%c' in --diff-filter=%s",
4204 offending, optarg);
4205 return argcount;
4206 }
4207 else if (!strcmp(arg, "--no-abbrev"))
4208 options->abbrev = 0;
4209 else if (!strcmp(arg, "--abbrev"))
4210 options->abbrev = DEFAULT_ABBREV;
4211 else if (skip_prefix(arg, "--abbrev=", &arg)) {
4212 options->abbrev = strtoul(arg, NULL, 10);
4213 if (options->abbrev < MINIMUM_ABBREV)
4214 options->abbrev = MINIMUM_ABBREV;
4215 else if (40 < options->abbrev)
4216 options->abbrev = 40;
4217 }
4218 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
4219 options->a_prefix = optarg;
4220 return argcount;
4221 }
4222 else if ((argcount = parse_long_opt("line-prefix", av, &optarg))) {
4223 options->line_prefix = optarg;
4224 options->line_prefix_length = strlen(options->line_prefix);
4225 graph_setup_line_prefix(options);
4226 return argcount;
4227 }
4228 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
4229 options->b_prefix = optarg;
4230 return argcount;
4231 }
4232 else if (!strcmp(arg, "--no-prefix"))
4233 options->a_prefix = options->b_prefix = "";
4234 else if (opt_arg(arg, '\0', "inter-hunk-context",
4235 &options->interhunkcontext))
4236 ;
4237 else if (!strcmp(arg, "-W"))
4238 DIFF_OPT_SET(options, FUNCCONTEXT);
4239 else if (!strcmp(arg, "--function-context"))
4240 DIFF_OPT_SET(options, FUNCCONTEXT);
4241 else if (!strcmp(arg, "--no-function-context"))
4242 DIFF_OPT_CLR(options, FUNCCONTEXT);
4243 else if ((argcount = parse_long_opt("output", av, &optarg))) {
4244 char *path = prefix_filename(prefix, optarg);
4245 options->file = xfopen(path, "w");
4246 options->close_file = 1;
4247 if (options->use_color != GIT_COLOR_ALWAYS)
4248 options->use_color = GIT_COLOR_NEVER;
4249 free(path);
4250 return argcount;
4251 } else
4252 return 0;
4253 return 1;
4254 }
4255
4256 int parse_rename_score(const char **cp_p)
4257 {
4258 unsigned long num, scale;
4259 int ch, dot;
4260 const char *cp = *cp_p;
4261
4262 num = 0;
4263 scale = 1;
4264 dot = 0;
4265 for (;;) {
4266 ch = *cp;
4267 if ( !dot && ch == '.' ) {
4268 scale = 1;
4269 dot = 1;
4270 } else if ( ch == '%' ) {
4271 scale = dot ? scale*100 : 100;
4272 cp++; /* % is always at the end */
4273 break;
4274 } else if ( ch >= '0' && ch <= '9' ) {
4275 if ( scale < 100000 ) {
4276 scale *= 10;
4277 num = (num*10) + (ch-'0');
4278 }
4279 } else {
4280 break;
4281 }
4282 cp++;
4283 }
4284 *cp_p = cp;
4285
4286 /* user says num divided by scale and we say internally that
4287 * is MAX_SCORE * num / scale.
4288 */
4289 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4290 }
4291
4292 static int diff_scoreopt_parse(const char *opt)
4293 {
4294 int opt1, opt2, cmd;
4295
4296 if (*opt++ != '-')
4297 return -1;
4298 cmd = *opt++;
4299 if (cmd == '-') {
4300 /* convert the long-form arguments into short-form versions */
4301 if (skip_prefix(opt, "break-rewrites", &opt)) {
4302 if (*opt == 0 || *opt++ == '=')
4303 cmd = 'B';
4304 } else if (skip_prefix(opt, "find-copies", &opt)) {
4305 if (*opt == 0 || *opt++ == '=')
4306 cmd = 'C';
4307 } else if (skip_prefix(opt, "find-renames", &opt)) {
4308 if (*opt == 0 || *opt++ == '=')
4309 cmd = 'M';
4310 }
4311 }
4312 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4313 return -1; /* that is not a -M, -C, or -B option */
4314
4315 opt1 = parse_rename_score(&opt);
4316 if (cmd != 'B')
4317 opt2 = 0;
4318 else {
4319 if (*opt == 0)
4320 opt2 = 0;
4321 else if (*opt != '/')
4322 return -1; /* we expect -B80/99 or -B80 */
4323 else {
4324 opt++;
4325 opt2 = parse_rename_score(&opt);
4326 }
4327 }
4328 if (*opt != 0)
4329 return -1;
4330 return opt1 | (opt2 << 16);
4331 }
4332
4333 struct diff_queue_struct diff_queued_diff;
4334
4335 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4336 {
4337 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4338 queue->queue[queue->nr++] = dp;
4339 }
4340
4341 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4342 struct diff_filespec *one,
4343 struct diff_filespec *two)
4344 {
4345 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4346 dp->one = one;
4347 dp->two = two;
4348 if (queue)
4349 diff_q(queue, dp);
4350 return dp;
4351 }
4352
4353 void diff_free_filepair(struct diff_filepair *p)
4354 {
4355 free_filespec(p->one);
4356 free_filespec(p->two);
4357 free(p);
4358 }
4359
4360 const char *diff_aligned_abbrev(const struct object_id *oid, int len)
4361 {
4362 int abblen;
4363 const char *abbrev;
4364
4365 if (len == GIT_SHA1_HEXSZ)
4366 return oid_to_hex(oid);
4367
4368 abbrev = diff_abbrev_oid(oid, len);
4369 abblen = strlen(abbrev);
4370
4371 /*
4372 * In well-behaved cases, where the abbbreviated result is the
4373 * same as the requested length, append three dots after the
4374 * abbreviation (hence the whole logic is limited to the case
4375 * where abblen < 37); when the actual abbreviated result is a
4376 * bit longer than the requested length, we reduce the number
4377 * of dots so that they match the well-behaved ones. However,
4378 * if the actual abbreviation is longer than the requested
4379 * length by more than three, we give up on aligning, and add
4380 * three dots anyway, to indicate that the output is not the
4381 * full object name. Yes, this may be suboptimal, but this
4382 * appears only in "diff --raw --abbrev" output and it is not
4383 * worth the effort to change it now. Note that this would
4384 * likely to work fine when the automatic sizing of default
4385 * abbreviation length is used--we would be fed -1 in "len" in
4386 * that case, and will end up always appending three-dots, but
4387 * the automatic sizing is supposed to give abblen that ensures
4388 * uniqueness across all objects (statistically speaking).
4389 */
4390 if (abblen < GIT_SHA1_HEXSZ - 3) {
4391 static char hex[GIT_MAX_HEXSZ + 1];
4392 if (len < abblen && abblen <= len + 2)
4393 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4394 else
4395 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4396 return hex;
4397 }
4398
4399 return oid_to_hex(oid);
4400 }
4401
4402 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4403 {
4404 int line_termination = opt->line_termination;
4405 int inter_name_termination = line_termination ? '\t' : '\0';
4406
4407 fprintf(opt->file, "%s", diff_line_prefix(opt));
4408 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4409 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4410 diff_aligned_abbrev(&p->one->oid, opt->abbrev));
4411 fprintf(opt->file, "%s ",
4412 diff_aligned_abbrev(&p->two->oid, opt->abbrev));
4413 }
4414 if (p->score) {
4415 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4416 inter_name_termination);
4417 } else {
4418 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4419 }
4420
4421 if (p->status == DIFF_STATUS_COPIED ||
4422 p->status == DIFF_STATUS_RENAMED) {
4423 const char *name_a, *name_b;
4424 name_a = p->one->path;
4425 name_b = p->two->path;
4426 strip_prefix(opt->prefix_length, &name_a, &name_b);
4427 write_name_quoted(name_a, opt->file, inter_name_termination);
4428 write_name_quoted(name_b, opt->file, line_termination);
4429 } else {
4430 const char *name_a, *name_b;
4431 name_a = p->one->mode ? p->one->path : p->two->path;
4432 name_b = NULL;
4433 strip_prefix(opt->prefix_length, &name_a, &name_b);
4434 write_name_quoted(name_a, opt->file, line_termination);
4435 }
4436 }
4437
4438 int diff_unmodified_pair(struct diff_filepair *p)
4439 {
4440 /* This function is written stricter than necessary to support
4441 * the currently implemented transformers, but the idea is to
4442 * let transformers to produce diff_filepairs any way they want,
4443 * and filter and clean them up here before producing the output.
4444 */
4445 struct diff_filespec *one = p->one, *two = p->two;
4446
4447 if (DIFF_PAIR_UNMERGED(p))
4448 return 0; /* unmerged is interesting */
4449
4450 /* deletion, addition, mode or type change
4451 * and rename are all interesting.
4452 */
4453 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4454 DIFF_PAIR_MODE_CHANGED(p) ||
4455 strcmp(one->path, two->path))
4456 return 0;
4457
4458 /* both are valid and point at the same path. that is, we are
4459 * dealing with a change.
4460 */
4461 if (one->oid_valid && two->oid_valid &&
4462 !oidcmp(&one->oid, &two->oid) &&
4463 !one->dirty_submodule && !two->dirty_submodule)
4464 return 1; /* no change */
4465 if (!one->oid_valid && !two->oid_valid)
4466 return 1; /* both look at the same file on the filesystem. */
4467 return 0;
4468 }
4469
4470 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4471 {
4472 if (diff_unmodified_pair(p))
4473 return;
4474
4475 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4476 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4477 return; /* no tree diffs in patch format */
4478
4479 run_diff(p, o);
4480 }
4481
4482 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4483 struct diffstat_t *diffstat)
4484 {
4485 if (diff_unmodified_pair(p))
4486 return;
4487
4488 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4489 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4490 return; /* no useful stat for tree diffs */
4491
4492 run_diffstat(p, o, diffstat);
4493 }
4494
4495 static void diff_flush_checkdiff(struct diff_filepair *p,
4496 struct diff_options *o)
4497 {
4498 if (diff_unmodified_pair(p))
4499 return;
4500
4501 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4502 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4503 return; /* nothing to check in tree diffs */
4504
4505 run_checkdiff(p, o);
4506 }
4507
4508 int diff_queue_is_empty(void)
4509 {
4510 struct diff_queue_struct *q = &diff_queued_diff;
4511 int i;
4512 for (i = 0; i < q->nr; i++)
4513 if (!diff_unmodified_pair(q->queue[i]))
4514 return 0;
4515 return 1;
4516 }
4517
4518 #if DIFF_DEBUG
4519 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4520 {
4521 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4522 x, one ? one : "",
4523 s->path,
4524 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4525 s->mode,
4526 s->oid_valid ? oid_to_hex(&s->oid) : "");
4527 fprintf(stderr, "queue[%d] %s size %lu\n",
4528 x, one ? one : "",
4529 s->size);
4530 }
4531
4532 void diff_debug_filepair(const struct diff_filepair *p, int i)
4533 {
4534 diff_debug_filespec(p->one, i, "one");
4535 diff_debug_filespec(p->two, i, "two");
4536 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4537 p->score, p->status ? p->status : '?',
4538 p->one->rename_used, p->broken_pair);
4539 }
4540
4541 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4542 {
4543 int i;
4544 if (msg)
4545 fprintf(stderr, "%s\n", msg);
4546 fprintf(stderr, "q->nr = %d\n", q->nr);
4547 for (i = 0; i < q->nr; i++) {
4548 struct diff_filepair *p = q->queue[i];
4549 diff_debug_filepair(p, i);
4550 }
4551 }
4552 #endif
4553
4554 static void diff_resolve_rename_copy(void)
4555 {
4556 int i;
4557 struct diff_filepair *p;
4558 struct diff_queue_struct *q = &diff_queued_diff;
4559
4560 diff_debug_queue("resolve-rename-copy", q);
4561
4562 for (i = 0; i < q->nr; i++) {
4563 p = q->queue[i];
4564 p->status = 0; /* undecided */
4565 if (DIFF_PAIR_UNMERGED(p))
4566 p->status = DIFF_STATUS_UNMERGED;
4567 else if (!DIFF_FILE_VALID(p->one))
4568 p->status = DIFF_STATUS_ADDED;
4569 else if (!DIFF_FILE_VALID(p->two))
4570 p->status = DIFF_STATUS_DELETED;
4571 else if (DIFF_PAIR_TYPE_CHANGED(p))
4572 p->status = DIFF_STATUS_TYPE_CHANGED;
4573
4574 /* from this point on, we are dealing with a pair
4575 * whose both sides are valid and of the same type, i.e.
4576 * either in-place edit or rename/copy edit.
4577 */
4578 else if (DIFF_PAIR_RENAME(p)) {
4579 /*
4580 * A rename might have re-connected a broken
4581 * pair up, causing the pathnames to be the
4582 * same again. If so, that's not a rename at
4583 * all, just a modification..
4584 *
4585 * Otherwise, see if this source was used for
4586 * multiple renames, in which case we decrement
4587 * the count, and call it a copy.
4588 */
4589 if (!strcmp(p->one->path, p->two->path))
4590 p->status = DIFF_STATUS_MODIFIED;
4591 else if (--p->one->rename_used > 0)
4592 p->status = DIFF_STATUS_COPIED;
4593 else
4594 p->status = DIFF_STATUS_RENAMED;
4595 }
4596 else if (oidcmp(&p->one->oid, &p->two->oid) ||
4597 p->one->mode != p->two->mode ||
4598 p->one->dirty_submodule ||
4599 p->two->dirty_submodule ||
4600 is_null_oid(&p->one->oid))
4601 p->status = DIFF_STATUS_MODIFIED;
4602 else {
4603 /* This is a "no-change" entry and should not
4604 * happen anymore, but prepare for broken callers.
4605 */
4606 error("feeding unmodified %s to diffcore",
4607 p->one->path);
4608 p->status = DIFF_STATUS_UNKNOWN;
4609 }
4610 }
4611 diff_debug_queue("resolve-rename-copy done", q);
4612 }
4613
4614 static int check_pair_status(struct diff_filepair *p)
4615 {
4616 switch (p->status) {
4617 case DIFF_STATUS_UNKNOWN:
4618 return 0;
4619 case 0:
4620 die("internal error in diff-resolve-rename-copy");
4621 default:
4622 return 1;
4623 }
4624 }
4625
4626 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4627 {
4628 int fmt = opt->output_format;
4629
4630 if (fmt & DIFF_FORMAT_CHECKDIFF)
4631 diff_flush_checkdiff(p, opt);
4632 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4633 diff_flush_raw(p, opt);
4634 else if (fmt & DIFF_FORMAT_NAME) {
4635 const char *name_a, *name_b;
4636 name_a = p->two->path;
4637 name_b = NULL;
4638 strip_prefix(opt->prefix_length, &name_a, &name_b);
4639 fprintf(opt->file, "%s", diff_line_prefix(opt));
4640 write_name_quoted(name_a, opt->file, opt->line_termination);
4641 }
4642 }
4643
4644 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4645 {
4646 if (fs->mode)
4647 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4648 else
4649 fprintf(file, " %s ", newdelete);
4650 write_name_quoted(fs->path, file, '\n');
4651 }
4652
4653
4654 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4655 const char *line_prefix)
4656 {
4657 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4658 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4659 p->two->mode, show_name ? ' ' : '\n');
4660 if (show_name) {
4661 write_name_quoted(p->two->path, file, '\n');
4662 }
4663 }
4664 }
4665
4666 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4667 const char *line_prefix)
4668 {
4669 char *names = pprint_rename(p->one->path, p->two->path);
4670
4671 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4672 free(names);
4673 show_mode_change(file, p, 0, line_prefix);
4674 }
4675
4676 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4677 {
4678 FILE *file = opt->file;
4679 const char *line_prefix = diff_line_prefix(opt);
4680
4681 switch(p->status) {
4682 case DIFF_STATUS_DELETED:
4683 fputs(line_prefix, file);
4684 show_file_mode_name(file, "delete", p->one);
4685 break;
4686 case DIFF_STATUS_ADDED:
4687 fputs(line_prefix, file);
4688 show_file_mode_name(file, "create", p->two);
4689 break;
4690 case DIFF_STATUS_COPIED:
4691 fputs(line_prefix, file);
4692 show_rename_copy(file, "copy", p, line_prefix);
4693 break;
4694 case DIFF_STATUS_RENAMED:
4695 fputs(line_prefix, file);
4696 show_rename_copy(file, "rename", p, line_prefix);
4697 break;
4698 default:
4699 if (p->score) {
4700 fprintf(file, "%s rewrite ", line_prefix);
4701 write_name_quoted(p->two->path, file, ' ');
4702 fprintf(file, "(%d%%)\n", similarity_index(p));
4703 }
4704 show_mode_change(file, p, !p->score, line_prefix);
4705 break;
4706 }
4707 }
4708
4709 struct patch_id_t {
4710 git_SHA_CTX *ctx;
4711 int patchlen;
4712 };
4713
4714 static int remove_space(char *line, int len)
4715 {
4716 int i;
4717 char *dst = line;
4718 unsigned char c;
4719
4720 for (i = 0; i < len; i++)
4721 if (!isspace((c = line[i])))
4722 *dst++ = c;
4723
4724 return dst - line;
4725 }
4726
4727 static void patch_id_consume(void *priv, char *line, unsigned long len)
4728 {
4729 struct patch_id_t *data = priv;
4730 int new_len;
4731
4732 /* Ignore line numbers when computing the SHA1 of the patch */
4733 if (starts_with(line, "@@ -"))
4734 return;
4735
4736 new_len = remove_space(line, len);
4737
4738 git_SHA1_Update(data->ctx, line, new_len);
4739 data->patchlen += new_len;
4740 }
4741
4742 static void patch_id_add_string(git_SHA_CTX *ctx, const char *str)
4743 {
4744 git_SHA1_Update(ctx, str, strlen(str));
4745 }
4746
4747 static void patch_id_add_mode(git_SHA_CTX *ctx, unsigned mode)
4748 {
4749 /* large enough for 2^32 in octal */
4750 char buf[12];
4751 int len = xsnprintf(buf, sizeof(buf), "%06o", mode);
4752 git_SHA1_Update(ctx, buf, len);
4753 }
4754
4755 /* returns 0 upon success, and writes result into sha1 */
4756 static int diff_get_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
4757 {
4758 struct diff_queue_struct *q = &diff_queued_diff;
4759 int i;
4760 git_SHA_CTX ctx;
4761 struct patch_id_t data;
4762
4763 git_SHA1_Init(&ctx);
4764 memset(&data, 0, sizeof(struct patch_id_t));
4765 data.ctx = &ctx;
4766
4767 for (i = 0; i < q->nr; i++) {
4768 xpparam_t xpp;
4769 xdemitconf_t xecfg;
4770 mmfile_t mf1, mf2;
4771 struct diff_filepair *p = q->queue[i];
4772 int len1, len2;
4773
4774 memset(&xpp, 0, sizeof(xpp));
4775 memset(&xecfg, 0, sizeof(xecfg));
4776 if (p->status == 0)
4777 return error("internal diff status error");
4778 if (p->status == DIFF_STATUS_UNKNOWN)
4779 continue;
4780 if (diff_unmodified_pair(p))
4781 continue;
4782 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4783 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4784 continue;
4785 if (DIFF_PAIR_UNMERGED(p))
4786 continue;
4787
4788 diff_fill_oid_info(p->one);
4789 diff_fill_oid_info(p->two);
4790
4791 len1 = remove_space(p->one->path, strlen(p->one->path));
4792 len2 = remove_space(p->two->path, strlen(p->two->path));
4793 patch_id_add_string(&ctx, "diff--git");
4794 patch_id_add_string(&ctx, "a/");
4795 git_SHA1_Update(&ctx, p->one->path, len1);
4796 patch_id_add_string(&ctx, "b/");
4797 git_SHA1_Update(&ctx, p->two->path, len2);
4798
4799 if (p->one->mode == 0) {
4800 patch_id_add_string(&ctx, "newfilemode");
4801 patch_id_add_mode(&ctx, p->two->mode);
4802 patch_id_add_string(&ctx, "---/dev/null");
4803 patch_id_add_string(&ctx, "+++b/");
4804 git_SHA1_Update(&ctx, p->two->path, len2);
4805 } else if (p->two->mode == 0) {
4806 patch_id_add_string(&ctx, "deletedfilemode");
4807 patch_id_add_mode(&ctx, p->one->mode);
4808 patch_id_add_string(&ctx, "---a/");
4809 git_SHA1_Update(&ctx, p->one->path, len1);
4810 patch_id_add_string(&ctx, "+++/dev/null");
4811 } else {
4812 patch_id_add_string(&ctx, "---a/");
4813 git_SHA1_Update(&ctx, p->one->path, len1);
4814 patch_id_add_string(&ctx, "+++b/");
4815 git_SHA1_Update(&ctx, p->two->path, len2);
4816 }
4817
4818 if (diff_header_only)
4819 continue;
4820
4821 if (fill_mmfile(&mf1, p->one) < 0 ||
4822 fill_mmfile(&mf2, p->two) < 0)
4823 return error("unable to read files to diff");
4824
4825 if (diff_filespec_is_binary(p->one) ||
4826 diff_filespec_is_binary(p->two)) {
4827 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
4828 GIT_SHA1_HEXSZ);
4829 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
4830 GIT_SHA1_HEXSZ);
4831 continue;
4832 }
4833
4834 xpp.flags = 0;
4835 xecfg.ctxlen = 3;
4836 xecfg.flags = 0;
4837 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4838 &xpp, &xecfg))
4839 return error("unable to generate patch-id diff for %s",
4840 p->one->path);
4841 }
4842
4843 git_SHA1_Final(oid->hash, &ctx);
4844 return 0;
4845 }
4846
4847 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
4848 {
4849 struct diff_queue_struct *q = &diff_queued_diff;
4850 int i;
4851 int result = diff_get_patch_id(options, oid, diff_header_only);
4852
4853 for (i = 0; i < q->nr; i++)
4854 diff_free_filepair(q->queue[i]);
4855
4856 free(q->queue);
4857 DIFF_QUEUE_CLEAR(q);
4858
4859 return result;
4860 }
4861
4862 static int is_summary_empty(const struct diff_queue_struct *q)
4863 {
4864 int i;
4865
4866 for (i = 0; i < q->nr; i++) {
4867 const struct diff_filepair *p = q->queue[i];
4868
4869 switch (p->status) {
4870 case DIFF_STATUS_DELETED:
4871 case DIFF_STATUS_ADDED:
4872 case DIFF_STATUS_COPIED:
4873 case DIFF_STATUS_RENAMED:
4874 return 0;
4875 default:
4876 if (p->score)
4877 return 0;
4878 if (p->one->mode && p->two->mode &&
4879 p->one->mode != p->two->mode)
4880 return 0;
4881 break;
4882 }
4883 }
4884 return 1;
4885 }
4886
4887 static const char rename_limit_warning[] =
4888 N_("inexact rename detection was skipped due to too many files.");
4889
4890 static const char degrade_cc_to_c_warning[] =
4891 N_("only found copies from modified paths due to too many files.");
4892
4893 static const char rename_limit_advice[] =
4894 N_("you may want to set your %s variable to at least "
4895 "%d and retry the command.");
4896
4897 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4898 {
4899 if (degraded_cc)
4900 warning(_(degrade_cc_to_c_warning));
4901 else if (needed)
4902 warning(_(rename_limit_warning));
4903 else
4904 return;
4905 if (0 < needed && needed < 32767)
4906 warning(_(rename_limit_advice), varname, needed);
4907 }
4908
4909 static void diff_flush_patch_all_file_pairs(struct diff_options *o)
4910 {
4911 int i;
4912 struct diff_queue_struct *q = &diff_queued_diff;
4913
4914 if (WSEH_NEW & WS_RULE_MASK)
4915 die("BUG: WS rules bit mask overlaps with diff symbol flags");
4916
4917 for (i = 0; i < q->nr; i++) {
4918 struct diff_filepair *p = q->queue[i];
4919 if (check_pair_status(p))
4920 diff_flush_patch(p, o);
4921 }
4922 }
4923
4924 void diff_flush(struct diff_options *options)
4925 {
4926 struct diff_queue_struct *q = &diff_queued_diff;
4927 int i, output_format = options->output_format;
4928 int separator = 0;
4929 int dirstat_by_line = 0;
4930
4931 /*
4932 * Order: raw, stat, summary, patch
4933 * or: name/name-status/checkdiff (other bits clear)
4934 */
4935 if (!q->nr)
4936 goto free_queue;
4937
4938 if (output_format & (DIFF_FORMAT_RAW |
4939 DIFF_FORMAT_NAME |
4940 DIFF_FORMAT_NAME_STATUS |
4941 DIFF_FORMAT_CHECKDIFF)) {
4942 for (i = 0; i < q->nr; i++) {
4943 struct diff_filepair *p = q->queue[i];
4944 if (check_pair_status(p))
4945 flush_one_pair(p, options);
4946 }
4947 separator++;
4948 }
4949
4950 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4951 dirstat_by_line = 1;
4952
4953 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4954 dirstat_by_line) {
4955 struct diffstat_t diffstat;
4956
4957 memset(&diffstat, 0, sizeof(struct diffstat_t));
4958 for (i = 0; i < q->nr; i++) {
4959 struct diff_filepair *p = q->queue[i];
4960 if (check_pair_status(p))
4961 diff_flush_stat(p, options, &diffstat);
4962 }
4963 if (output_format & DIFF_FORMAT_NUMSTAT)
4964 show_numstat(&diffstat, options);
4965 if (output_format & DIFF_FORMAT_DIFFSTAT)
4966 show_stats(&diffstat, options);
4967 if (output_format & DIFF_FORMAT_SHORTSTAT)
4968 show_shortstats(&diffstat, options);
4969 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4970 show_dirstat_by_line(&diffstat, options);
4971 free_diffstat_info(&diffstat);
4972 separator++;
4973 }
4974 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4975 show_dirstat(options);
4976
4977 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4978 for (i = 0; i < q->nr; i++) {
4979 diff_summary(options, q->queue[i]);
4980 }
4981 separator++;
4982 }
4983
4984 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4985 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4986 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4987 /*
4988 * run diff_flush_patch for the exit status. setting
4989 * options->file to /dev/null should be safe, because we
4990 * aren't supposed to produce any output anyway.
4991 */
4992 if (options->close_file)
4993 fclose(options->file);
4994 options->file = xfopen("/dev/null", "w");
4995 options->close_file = 1;
4996 for (i = 0; i < q->nr; i++) {
4997 struct diff_filepair *p = q->queue[i];
4998 if (check_pair_status(p))
4999 diff_flush_patch(p, options);
5000 if (options->found_changes)
5001 break;
5002 }
5003 }
5004
5005 if (output_format & DIFF_FORMAT_PATCH) {
5006 if (separator) {
5007 emit_diff_symbol(options, DIFF_SYMBOL_SEPARATOR, NULL, 0, 0);
5008 if (options->stat_sep) {
5009 /* attach patch instead of inline */
5010 fputs(options->stat_sep, options->file);
5011 }
5012 }
5013
5014 diff_flush_patch_all_file_pairs(options);
5015 }
5016
5017 if (output_format & DIFF_FORMAT_CALLBACK)
5018 options->format_callback(q, options, options->format_callback_data);
5019
5020 for (i = 0; i < q->nr; i++)
5021 diff_free_filepair(q->queue[i]);
5022 free_queue:
5023 free(q->queue);
5024 DIFF_QUEUE_CLEAR(q);
5025 if (options->close_file)
5026 fclose(options->file);
5027
5028 /*
5029 * Report the content-level differences with HAS_CHANGES;
5030 * diff_addremove/diff_change does not set the bit when
5031 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
5032 */
5033 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
5034 if (options->found_changes)
5035 DIFF_OPT_SET(options, HAS_CHANGES);
5036 else
5037 DIFF_OPT_CLR(options, HAS_CHANGES);
5038 }
5039 }
5040
5041 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
5042 {
5043 return (((p->status == DIFF_STATUS_MODIFIED) &&
5044 ((p->score &&
5045 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
5046 (!p->score &&
5047 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
5048 ((p->status != DIFF_STATUS_MODIFIED) &&
5049 filter_bit_tst(p->status, options)));
5050 }
5051
5052 static void diffcore_apply_filter(struct diff_options *options)
5053 {
5054 int i;
5055 struct diff_queue_struct *q = &diff_queued_diff;
5056 struct diff_queue_struct outq;
5057
5058 DIFF_QUEUE_CLEAR(&outq);
5059
5060 if (!options->filter)
5061 return;
5062
5063 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
5064 int found;
5065 for (i = found = 0; !found && i < q->nr; i++) {
5066 if (match_filter(options, q->queue[i]))
5067 found++;
5068 }
5069 if (found)
5070 return;
5071
5072 /* otherwise we will clear the whole queue
5073 * by copying the empty outq at the end of this
5074 * function, but first clear the current entries
5075 * in the queue.
5076 */
5077 for (i = 0; i < q->nr; i++)
5078 diff_free_filepair(q->queue[i]);
5079 }
5080 else {
5081 /* Only the matching ones */
5082 for (i = 0; i < q->nr; i++) {
5083 struct diff_filepair *p = q->queue[i];
5084 if (match_filter(options, p))
5085 diff_q(&outq, p);
5086 else
5087 diff_free_filepair(p);
5088 }
5089 }
5090 free(q->queue);
5091 *q = outq;
5092 }
5093
5094 /* Check whether two filespecs with the same mode and size are identical */
5095 static int diff_filespec_is_identical(struct diff_filespec *one,
5096 struct diff_filespec *two)
5097 {
5098 if (S_ISGITLINK(one->mode))
5099 return 0;
5100 if (diff_populate_filespec(one, 0))
5101 return 0;
5102 if (diff_populate_filespec(two, 0))
5103 return 0;
5104 return !memcmp(one->data, two->data, one->size);
5105 }
5106
5107 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
5108 {
5109 if (p->done_skip_stat_unmatch)
5110 return p->skip_stat_unmatch_result;
5111
5112 p->done_skip_stat_unmatch = 1;
5113 p->skip_stat_unmatch_result = 0;
5114 /*
5115 * 1. Entries that come from stat info dirtiness
5116 * always have both sides (iow, not create/delete),
5117 * one side of the object name is unknown, with
5118 * the same mode and size. Keep the ones that
5119 * do not match these criteria. They have real
5120 * differences.
5121 *
5122 * 2. At this point, the file is known to be modified,
5123 * with the same mode and size, and the object
5124 * name of one side is unknown. Need to inspect
5125 * the identical contents.
5126 */
5127 if (!DIFF_FILE_VALID(p->one) || /* (1) */
5128 !DIFF_FILE_VALID(p->two) ||
5129 (p->one->oid_valid && p->two->oid_valid) ||
5130 (p->one->mode != p->two->mode) ||
5131 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
5132 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
5133 (p->one->size != p->two->size) ||
5134 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
5135 p->skip_stat_unmatch_result = 1;
5136 return p->skip_stat_unmatch_result;
5137 }
5138
5139 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
5140 {
5141 int i;
5142 struct diff_queue_struct *q = &diff_queued_diff;
5143 struct diff_queue_struct outq;
5144 DIFF_QUEUE_CLEAR(&outq);
5145
5146 for (i = 0; i < q->nr; i++) {
5147 struct diff_filepair *p = q->queue[i];
5148
5149 if (diff_filespec_check_stat_unmatch(p))
5150 diff_q(&outq, p);
5151 else {
5152 /*
5153 * The caller can subtract 1 from skip_stat_unmatch
5154 * to determine how many paths were dirty only
5155 * due to stat info mismatch.
5156 */
5157 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
5158 diffopt->skip_stat_unmatch++;
5159 diff_free_filepair(p);
5160 }
5161 }
5162 free(q->queue);
5163 *q = outq;
5164 }
5165
5166 static int diffnamecmp(const void *a_, const void *b_)
5167 {
5168 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
5169 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
5170 const char *name_a, *name_b;
5171
5172 name_a = a->one ? a->one->path : a->two->path;
5173 name_b = b->one ? b->one->path : b->two->path;
5174 return strcmp(name_a, name_b);
5175 }
5176
5177 void diffcore_fix_diff_index(struct diff_options *options)
5178 {
5179 struct diff_queue_struct *q = &diff_queued_diff;
5180 QSORT(q->queue, q->nr, diffnamecmp);
5181 }
5182
5183 void diffcore_std(struct diff_options *options)
5184 {
5185 /* NOTE please keep the following in sync with diff_tree_combined() */
5186 if (options->skip_stat_unmatch)
5187 diffcore_skip_stat_unmatch(options);
5188 if (!options->found_follow) {
5189 /* See try_to_follow_renames() in tree-diff.c */
5190 if (options->break_opt != -1)
5191 diffcore_break(options->break_opt);
5192 if (options->detect_rename)
5193 diffcore_rename(options);
5194 if (options->break_opt != -1)
5195 diffcore_merge_broken();
5196 }
5197 if (options->pickaxe)
5198 diffcore_pickaxe(options);
5199 if (options->orderfile)
5200 diffcore_order(options->orderfile);
5201 if (!options->found_follow)
5202 /* See try_to_follow_renames() in tree-diff.c */
5203 diff_resolve_rename_copy();
5204 diffcore_apply_filter(options);
5205
5206 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5207 DIFF_OPT_SET(options, HAS_CHANGES);
5208 else
5209 DIFF_OPT_CLR(options, HAS_CHANGES);
5210
5211 options->found_follow = 0;
5212 }
5213
5214 int diff_result_code(struct diff_options *opt, int status)
5215 {
5216 int result = 0;
5217
5218 diff_warn_rename_limit("diff.renameLimit",
5219 opt->needed_rename_limit,
5220 opt->degraded_cc_to_c);
5221 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5222 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
5223 return status;
5224 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5225 DIFF_OPT_TST(opt, HAS_CHANGES))
5226 result |= 01;
5227 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
5228 DIFF_OPT_TST(opt, CHECK_FAILED))
5229 result |= 02;
5230 return result;
5231 }
5232
5233 int diff_can_quit_early(struct diff_options *opt)
5234 {
5235 return (DIFF_OPT_TST(opt, QUICK) &&
5236 !opt->filter &&
5237 DIFF_OPT_TST(opt, HAS_CHANGES));
5238 }
5239
5240 /*
5241 * Shall changes to this submodule be ignored?
5242 *
5243 * Submodule changes can be configured to be ignored separately for each path,
5244 * but that configuration can be overridden from the command line.
5245 */
5246 static int is_submodule_ignored(const char *path, struct diff_options *options)
5247 {
5248 int ignored = 0;
5249 unsigned orig_flags = options->flags;
5250 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
5251 set_diffopt_flags_from_submodule_config(options, path);
5252 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
5253 ignored = 1;
5254 options->flags = orig_flags;
5255 return ignored;
5256 }
5257
5258 void diff_addremove(struct diff_options *options,
5259 int addremove, unsigned mode,
5260 const struct object_id *oid,
5261 int oid_valid,
5262 const char *concatpath, unsigned dirty_submodule)
5263 {
5264 struct diff_filespec *one, *two;
5265
5266 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
5267 return;
5268
5269 /* This may look odd, but it is a preparation for
5270 * feeding "there are unchanged files which should
5271 * not produce diffs, but when you are doing copy
5272 * detection you would need them, so here they are"
5273 * entries to the diff-core. They will be prefixed
5274 * with something like '=' or '*' (I haven't decided
5275 * which but should not make any difference).
5276 * Feeding the same new and old to diff_change()
5277 * also has the same effect.
5278 * Before the final output happens, they are pruned after
5279 * merged into rename/copy pairs as appropriate.
5280 */
5281 if (DIFF_OPT_TST(options, REVERSE_DIFF))
5282 addremove = (addremove == '+' ? '-' :
5283 addremove == '-' ? '+' : addremove);
5284
5285 if (options->prefix &&
5286 strncmp(concatpath, options->prefix, options->prefix_length))
5287 return;
5288
5289 one = alloc_filespec(concatpath);
5290 two = alloc_filespec(concatpath);
5291
5292 if (addremove != '+')
5293 fill_filespec(one, oid, oid_valid, mode);
5294 if (addremove != '-') {
5295 fill_filespec(two, oid, oid_valid, mode);
5296 two->dirty_submodule = dirty_submodule;
5297 }
5298
5299 diff_queue(&diff_queued_diff, one, two);
5300 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5301 DIFF_OPT_SET(options, HAS_CHANGES);
5302 }
5303
5304 void diff_change(struct diff_options *options,
5305 unsigned old_mode, unsigned new_mode,
5306 const struct object_id *old_oid,
5307 const struct object_id *new_oid,
5308 int old_oid_valid, int new_oid_valid,
5309 const char *concatpath,
5310 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5311 {
5312 struct diff_filespec *one, *two;
5313 struct diff_filepair *p;
5314
5315 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5316 is_submodule_ignored(concatpath, options))
5317 return;
5318
5319 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5320 SWAP(old_mode, new_mode);
5321 SWAP(old_oid, new_oid);
5322 SWAP(old_oid_valid, new_oid_valid);
5323 SWAP(old_dirty_submodule, new_dirty_submodule);
5324 }
5325
5326 if (options->prefix &&
5327 strncmp(concatpath, options->prefix, options->prefix_length))
5328 return;
5329
5330 one = alloc_filespec(concatpath);
5331 two = alloc_filespec(concatpath);
5332 fill_filespec(one, old_oid, old_oid_valid, old_mode);
5333 fill_filespec(two, new_oid, new_oid_valid, new_mode);
5334 one->dirty_submodule = old_dirty_submodule;
5335 two->dirty_submodule = new_dirty_submodule;
5336 p = diff_queue(&diff_queued_diff, one, two);
5337
5338 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5339 return;
5340
5341 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5342 !diff_filespec_check_stat_unmatch(p))
5343 return;
5344
5345 DIFF_OPT_SET(options, HAS_CHANGES);
5346 }
5347
5348 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5349 {
5350 struct diff_filepair *pair;
5351 struct diff_filespec *one, *two;
5352
5353 if (options->prefix &&
5354 strncmp(path, options->prefix, options->prefix_length))
5355 return NULL;
5356
5357 one = alloc_filespec(path);
5358 two = alloc_filespec(path);
5359 pair = diff_queue(&diff_queued_diff, one, two);
5360 pair->is_unmerged = 1;
5361 return pair;
5362 }
5363
5364 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5365 size_t *outsize)
5366 {
5367 struct diff_tempfile *temp;
5368 const char *argv[3];
5369 const char **arg = argv;
5370 struct child_process child = CHILD_PROCESS_INIT;
5371 struct strbuf buf = STRBUF_INIT;
5372 int err = 0;
5373
5374 temp = prepare_temp_file(spec->path, spec);
5375 *arg++ = pgm;
5376 *arg++ = temp->name;
5377 *arg = NULL;
5378
5379 child.use_shell = 1;
5380 child.argv = argv;
5381 child.out = -1;
5382 if (start_command(&child)) {
5383 remove_tempfile();
5384 return NULL;
5385 }
5386
5387 if (strbuf_read(&buf, child.out, 0) < 0)
5388 err = error("error reading from textconv command '%s'", pgm);
5389 close(child.out);
5390
5391 if (finish_command(&child) || err) {
5392 strbuf_release(&buf);
5393 remove_tempfile();
5394 return NULL;
5395 }
5396 remove_tempfile();
5397
5398 return strbuf_detach(&buf, outsize);
5399 }
5400
5401 size_t fill_textconv(struct userdiff_driver *driver,
5402 struct diff_filespec *df,
5403 char **outbuf)
5404 {
5405 size_t size;
5406
5407 if (!driver) {
5408 if (!DIFF_FILE_VALID(df)) {
5409 *outbuf = "";
5410 return 0;
5411 }
5412 if (diff_populate_filespec(df, 0))
5413 die("unable to read files to diff");
5414 *outbuf = df->data;
5415 return df->size;
5416 }
5417
5418 if (!driver->textconv)
5419 die("BUG: fill_textconv called with non-textconv driver");
5420
5421 if (driver->textconv_cache && df->oid_valid) {
5422 *outbuf = notes_cache_get(driver->textconv_cache,
5423 &df->oid,
5424 &size);
5425 if (*outbuf)
5426 return size;
5427 }
5428
5429 *outbuf = run_textconv(driver->textconv, df, &size);
5430 if (!*outbuf)
5431 die("unable to read files to diff");
5432
5433 if (driver->textconv_cache && df->oid_valid) {
5434 /* ignore errors, as we might be in a readonly repository */
5435 notes_cache_put(driver->textconv_cache, &df->oid, *outbuf,
5436 size);
5437 /*
5438 * we could save up changes and flush them all at the end,
5439 * but we would need an extra call after all diffing is done.
5440 * Since generating a cache entry is the slow path anyway,
5441 * this extra overhead probably isn't a big deal.
5442 */
5443 notes_cache_write(driver->textconv_cache);
5444 }
5445
5446 return size;
5447 }
5448
5449 int textconv_object(const char *path,
5450 unsigned mode,
5451 const struct object_id *oid,
5452 int oid_valid,
5453 char **buf,
5454 unsigned long *buf_size)
5455 {
5456 struct diff_filespec *df;
5457 struct userdiff_driver *textconv;
5458
5459 df = alloc_filespec(path);
5460 fill_filespec(df, oid, oid_valid, mode);
5461 textconv = get_textconv(df);
5462 if (!textconv) {
5463 free_filespec(df);
5464 return 0;
5465 }
5466
5467 *buf_size = fill_textconv(textconv, df, buf);
5468 free_filespec(df);
5469 return 1;
5470 }
5471
5472 void setup_diff_pager(struct diff_options *opt)
5473 {
5474 /*
5475 * If the user asked for our exit code, then either they want --quiet
5476 * or --exit-code. We should definitely not bother with a pager in the
5477 * former case, as we will generate no output. Since we still properly
5478 * report our exit code even when a pager is run, we _could_ run a
5479 * pager with --exit-code. But since we have not done so historically,
5480 * and because it is easy to find people oneline advising "git diff
5481 * --exit-code" in hooks and other scripts, we do not do so.
5482 */
5483 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5484 check_pager_config("diff") != 0)
5485 setup_pager();
5486 }
Unnamed repository; edit this file 'description' to name the repository.