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doc: gitrevisions - clarify 'latter case' is revision walk
[git.git] / diff.c
blob46260ed7a1d521cf95342caff83a825b34959bdc
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "tempfile.h"
6 #include "quote.h"
7 #include "diff.h"
8 #include "diffcore.h"
9 #include "delta.h"
10 #include "xdiff-interface.h"
11 #include "color.h"
12 #include "attr.h"
13 #include "run-command.h"
14 #include "utf8.h"
15 #include "userdiff.h"
16 #include "sigchain.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
23 #ifdef NO_FAST_WORKING_DIRECTORY
24 #define FAST_WORKING_DIRECTORY 0
25 #else
26 #define FAST_WORKING_DIRECTORY 1
27 #endif
28
29 static int diff_detect_rename_default;
30 static int diff_rename_limit_default = 400;
31 static int diff_suppress_blank_empty;
32 static int diff_use_color_default = -1;
33 static int diff_context_default = 3;
34 static const char *diff_word_regex_cfg;
35 static const char *external_diff_cmd_cfg;
36 static const char *diff_order_file_cfg;
37 int diff_auto_refresh_index = 1;
38 static int diff_mnemonic_prefix;
39 static int diff_no_prefix;
40 static int diff_stat_graph_width;
41 static int diff_dirstat_permille_default = 30;
42 static struct diff_options default_diff_options;
43 static long diff_algorithm;
44
45 static char diff_colors[][COLOR_MAXLEN] = {
46 GIT_COLOR_RESET,
47 GIT_COLOR_NORMAL, /* CONTEXT */
48 GIT_COLOR_BOLD, /* METAINFO */
49 GIT_COLOR_CYAN, /* FRAGINFO */
50 GIT_COLOR_RED, /* OLD */
51 GIT_COLOR_GREEN, /* NEW */
52 GIT_COLOR_YELLOW, /* COMMIT */
53 GIT_COLOR_BG_RED, /* WHITESPACE */
54 GIT_COLOR_NORMAL, /* FUNCINFO */
55 };
56
57 static int parse_diff_color_slot(const char *var)
58 {
59 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
60 return DIFF_CONTEXT;
61 if (!strcasecmp(var, "meta"))
62 return DIFF_METAINFO;
63 if (!strcasecmp(var, "frag"))
64 return DIFF_FRAGINFO;
65 if (!strcasecmp(var, "old"))
66 return DIFF_FILE_OLD;
67 if (!strcasecmp(var, "new"))
68 return DIFF_FILE_NEW;
69 if (!strcasecmp(var, "commit"))
70 return DIFF_COMMIT;
71 if (!strcasecmp(var, "whitespace"))
72 return DIFF_WHITESPACE;
73 if (!strcasecmp(var, "func"))
74 return DIFF_FUNCINFO;
75 return -1;
76 }
77
78 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
79 struct strbuf *errmsg)
80 {
81 char *params_copy = xstrdup(params_string);
82 struct string_list params = STRING_LIST_INIT_NODUP;
83 int ret = 0;
84 int i;
85
86 if (*params_copy)
87 string_list_split_in_place(&params, params_copy, ',', -1);
88 for (i = 0; i < params.nr; i++) {
89 const char *p = params.items[i].string;
90 if (!strcmp(p, "changes")) {
91 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
92 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
93 } else if (!strcmp(p, "lines")) {
94 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
95 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
96 } else if (!strcmp(p, "files")) {
97 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
98 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
99 } else if (!strcmp(p, "noncumulative")) {
100 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
101 } else if (!strcmp(p, "cumulative")) {
102 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
103 } else if (isdigit(*p)) {
104 char *end;
105 int permille = strtoul(p, &end, 10) * 10;
106 if (*end == '.' && isdigit(*++end)) {
107 /* only use first digit */
108 permille += *end - '0';
109 /* .. and ignore any further digits */
110 while (isdigit(*++end))
111 ; /* nothing */
112 }
113 if (!*end)
114 options->dirstat_permille = permille;
115 else {
116 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
117 p);
118 ret++;
119 }
120 } else {
121 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
122 ret++;
123 }
124
125 }
126 string_list_clear(&params, 0);
127 free(params_copy);
128 return ret;
129 }
130
131 static int parse_submodule_params(struct diff_options *options, const char *value)
132 {
133 if (!strcmp(value, "log"))
134 DIFF_OPT_SET(options, SUBMODULE_LOG);
135 else if (!strcmp(value, "short"))
136 DIFF_OPT_CLR(options, SUBMODULE_LOG);
137 else
138 return -1;
139 return 0;
140 }
141
142 static int git_config_rename(const char *var, const char *value)
143 {
144 if (!value)
145 return DIFF_DETECT_RENAME;
146 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
147 return DIFF_DETECT_COPY;
148 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
149 }
150
151 long parse_algorithm_value(const char *value)
152 {
153 if (!value)
154 return -1;
155 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
156 return 0;
157 else if (!strcasecmp(value, "minimal"))
158 return XDF_NEED_MINIMAL;
159 else if (!strcasecmp(value, "patience"))
160 return XDF_PATIENCE_DIFF;
161 else if (!strcasecmp(value, "histogram"))
162 return XDF_HISTOGRAM_DIFF;
163 return -1;
164 }
165
166 /*
167 * These are to give UI layer defaults.
168 * The core-level commands such as git-diff-files should
169 * never be affected by the setting of diff.renames
170 * the user happens to have in the configuration file.
171 */
172 int git_diff_ui_config(const char *var, const char *value, void *cb)
173 {
174 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
175 diff_use_color_default = git_config_colorbool(var, value);
176 return 0;
177 }
178 if (!strcmp(var, "diff.context")) {
179 diff_context_default = git_config_int(var, value);
180 if (diff_context_default < 0)
181 return -1;
182 return 0;
183 }
184 if (!strcmp(var, "diff.renames")) {
185 diff_detect_rename_default = git_config_rename(var, value);
186 return 0;
187 }
188 if (!strcmp(var, "diff.autorefreshindex")) {
189 diff_auto_refresh_index = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp(var, "diff.mnemonicprefix")) {
193 diff_mnemonic_prefix = git_config_bool(var, value);
194 return 0;
195 }
196 if (!strcmp(var, "diff.noprefix")) {
197 diff_no_prefix = git_config_bool(var, value);
198 return 0;
199 }
200 if (!strcmp(var, "diff.statgraphwidth")) {
201 diff_stat_graph_width = git_config_int(var, value);
202 return 0;
203 }
204 if (!strcmp(var, "diff.external"))
205 return git_config_string(&external_diff_cmd_cfg, var, value);
206 if (!strcmp(var, "diff.wordregex"))
207 return git_config_string(&diff_word_regex_cfg, var, value);
208 if (!strcmp(var, "diff.orderfile"))
209 return git_config_pathname(&diff_order_file_cfg, var, value);
210
211 if (!strcmp(var, "diff.ignoresubmodules"))
212 handle_ignore_submodules_arg(&default_diff_options, value);
213
214 if (!strcmp(var, "diff.submodule")) {
215 if (parse_submodule_params(&default_diff_options, value))
216 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
217 value);
218 return 0;
219 }
220
221 if (!strcmp(var, "diff.algorithm")) {
222 diff_algorithm = parse_algorithm_value(value);
223 if (diff_algorithm < 0)
224 return -1;
225 return 0;
226 }
227
228 if (git_color_config(var, value, cb) < 0)
229 return -1;
230
231 return git_diff_basic_config(var, value, cb);
232 }
233
234 int git_diff_basic_config(const char *var, const char *value, void *cb)
235 {
236 const char *name;
237
238 if (!strcmp(var, "diff.renamelimit")) {
239 diff_rename_limit_default = git_config_int(var, value);
240 return 0;
241 }
242
243 if (userdiff_config(var, value) < 0)
244 return -1;
245
246 if (skip_prefix(var, "diff.color.", &name) ||
247 skip_prefix(var, "color.diff.", &name)) {
248 int slot = parse_diff_color_slot(name);
249 if (slot < 0)
250 return 0;
251 if (!value)
252 return config_error_nonbool(var);
253 return color_parse(value, diff_colors[slot]);
254 }
255
256 /* like GNU diff's --suppress-blank-empty option */
257 if (!strcmp(var, "diff.suppressblankempty") ||
258 /* for backwards compatibility */
259 !strcmp(var, "diff.suppress-blank-empty")) {
260 diff_suppress_blank_empty = git_config_bool(var, value);
261 return 0;
262 }
263
264 if (!strcmp(var, "diff.dirstat")) {
265 struct strbuf errmsg = STRBUF_INIT;
266 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
267 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
268 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
269 errmsg.buf);
270 strbuf_release(&errmsg);
271 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
272 return 0;
273 }
274
275 if (starts_with(var, "submodule."))
276 return parse_submodule_config_option(var, value);
277
278 return git_default_config(var, value, cb);
279 }
280
281 static char *quote_two(const char *one, const char *two)
282 {
283 int need_one = quote_c_style(one, NULL, NULL, 1);
284 int need_two = quote_c_style(two, NULL, NULL, 1);
285 struct strbuf res = STRBUF_INIT;
286
287 if (need_one + need_two) {
288 strbuf_addch(&res, '"');
289 quote_c_style(one, &res, NULL, 1);
290 quote_c_style(two, &res, NULL, 1);
291 strbuf_addch(&res, '"');
292 } else {
293 strbuf_addstr(&res, one);
294 strbuf_addstr(&res, two);
295 }
296 return strbuf_detach(&res, NULL);
297 }
298
299 static const char *external_diff(void)
300 {
301 static const char *external_diff_cmd = NULL;
302 static int done_preparing = 0;
303
304 if (done_preparing)
305 return external_diff_cmd;
306 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
307 if (!external_diff_cmd)
308 external_diff_cmd = external_diff_cmd_cfg;
309 done_preparing = 1;
310 return external_diff_cmd;
311 }
312
313 /*
314 * Keep track of files used for diffing. Sometimes such an entry
315 * refers to a temporary file, sometimes to an existing file, and
316 * sometimes to "/dev/null".
317 */
318 static struct diff_tempfile {
319 /*
320 * filename external diff should read from, or NULL if this
321 * entry is currently not in use:
322 */
323 const char *name;
324
325 char hex[41];
326 char mode[10];
327
328 /*
329 * If this diff_tempfile instance refers to a temporary file,
330 * this tempfile object is used to manage its lifetime.
331 */
332 struct tempfile tempfile;
333 } diff_temp[2];
334
335 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
336
337 struct emit_callback {
338 int color_diff;
339 unsigned ws_rule;
340 int blank_at_eof_in_preimage;
341 int blank_at_eof_in_postimage;
342 int lno_in_preimage;
343 int lno_in_postimage;
344 sane_truncate_fn truncate;
345 const char **label_path;
346 struct diff_words_data *diff_words;
347 struct diff_options *opt;
348 int *found_changesp;
349 struct strbuf *header;
350 };
351
352 static int count_lines(const char *data, int size)
353 {
354 int count, ch, completely_empty = 1, nl_just_seen = 0;
355 count = 0;
356 while (0 < size--) {
357 ch = *data++;
358 if (ch == '\n') {
359 count++;
360 nl_just_seen = 1;
361 completely_empty = 0;
362 }
363 else {
364 nl_just_seen = 0;
365 completely_empty = 0;
366 }
367 }
368 if (completely_empty)
369 return 0;
370 if (!nl_just_seen)
371 count++; /* no trailing newline */
372 return count;
373 }
374
375 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
376 {
377 if (!DIFF_FILE_VALID(one)) {
378 mf->ptr = (char *)""; /* does not matter */
379 mf->size = 0;
380 return 0;
381 }
382 else if (diff_populate_filespec(one, 0))
383 return -1;
384
385 mf->ptr = one->data;
386 mf->size = one->size;
387 return 0;
388 }
389
390 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
391 static unsigned long diff_filespec_size(struct diff_filespec *one)
392 {
393 if (!DIFF_FILE_VALID(one))
394 return 0;
395 diff_populate_filespec(one, CHECK_SIZE_ONLY);
396 return one->size;
397 }
398
399 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
400 {
401 char *ptr = mf->ptr;
402 long size = mf->size;
403 int cnt = 0;
404
405 if (!size)
406 return cnt;
407 ptr += size - 1; /* pointing at the very end */
408 if (*ptr != '\n')
409 ; /* incomplete line */
410 else
411 ptr--; /* skip the last LF */
412 while (mf->ptr < ptr) {
413 char *prev_eol;
414 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
415 if (*prev_eol == '\n')
416 break;
417 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
418 break;
419 cnt++;
420 ptr = prev_eol - 1;
421 }
422 return cnt;
423 }
424
425 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
426 struct emit_callback *ecbdata)
427 {
428 int l1, l2, at;
429 unsigned ws_rule = ecbdata->ws_rule;
430 l1 = count_trailing_blank(mf1, ws_rule);
431 l2 = count_trailing_blank(mf2, ws_rule);
432 if (l2 <= l1) {
433 ecbdata->blank_at_eof_in_preimage = 0;
434 ecbdata->blank_at_eof_in_postimage = 0;
435 return;
436 }
437 at = count_lines(mf1->ptr, mf1->size);
438 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
439
440 at = count_lines(mf2->ptr, mf2->size);
441 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
442 }
443
444 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
445 int first, const char *line, int len)
446 {
447 int has_trailing_newline, has_trailing_carriage_return;
448 int nofirst;
449 FILE *file = o->file;
450
451 fputs(diff_line_prefix(o), file);
452
453 if (len == 0) {
454 has_trailing_newline = (first == '\n');
455 has_trailing_carriage_return = (!has_trailing_newline &&
456 (first == '\r'));
457 nofirst = has_trailing_newline || has_trailing_carriage_return;
458 } else {
459 has_trailing_newline = (len > 0 && line[len-1] == '\n');
460 if (has_trailing_newline)
461 len--;
462 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
463 if (has_trailing_carriage_return)
464 len--;
465 nofirst = 0;
466 }
467
468 if (len || !nofirst) {
469 fputs(set, file);
470 if (!nofirst)
471 fputc(first, file);
472 fwrite(line, len, 1, file);
473 fputs(reset, file);
474 }
475 if (has_trailing_carriage_return)
476 fputc('\r', file);
477 if (has_trailing_newline)
478 fputc('\n', file);
479 }
480
481 static void emit_line(struct diff_options *o, const char *set, const char *reset,
482 const char *line, int len)
483 {
484 emit_line_0(o, set, reset, line[0], line+1, len-1);
485 }
486
487 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
488 {
489 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
490 ecbdata->blank_at_eof_in_preimage &&
491 ecbdata->blank_at_eof_in_postimage &&
492 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
493 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
494 return 0;
495 return ws_blank_line(line, len, ecbdata->ws_rule);
496 }
497
498 static void emit_line_checked(const char *reset,
499 struct emit_callback *ecbdata,
500 const char *line, int len,
501 enum color_diff color,
502 unsigned ws_error_highlight,
503 char sign)
504 {
505 const char *set = diff_get_color(ecbdata->color_diff, color);
506 const char *ws = NULL;
507
508 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
509 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
510 if (!*ws)
511 ws = NULL;
512 }
513
514 if (!ws)
515 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
516 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
517 /* Blank line at EOF - paint '+' as well */
518 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
519 else {
520 /* Emit just the prefix, then the rest. */
521 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
522 ws_check_emit(line, len, ecbdata->ws_rule,
523 ecbdata->opt->file, set, reset, ws);
524 }
525 }
526
527 static void emit_add_line(const char *reset,
528 struct emit_callback *ecbdata,
529 const char *line, int len)
530 {
531 emit_line_checked(reset, ecbdata, line, len,
532 DIFF_FILE_NEW, WSEH_NEW, '+');
533 }
534
535 static void emit_del_line(const char *reset,
536 struct emit_callback *ecbdata,
537 const char *line, int len)
538 {
539 emit_line_checked(reset, ecbdata, line, len,
540 DIFF_FILE_OLD, WSEH_OLD, '-');
541 }
542
543 static void emit_context_line(const char *reset,
544 struct emit_callback *ecbdata,
545 const char *line, int len)
546 {
547 emit_line_checked(reset, ecbdata, line, len,
548 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
549 }
550
551 static void emit_hunk_header(struct emit_callback *ecbdata,
552 const char *line, int len)
553 {
554 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
555 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
556 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
557 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
558 static const char atat[2] = { '@', '@' };
559 const char *cp, *ep;
560 struct strbuf msgbuf = STRBUF_INIT;
561 int org_len = len;
562 int i = 1;
563
564 /*
565 * As a hunk header must begin with "@@ -<old>, +<new> @@",
566 * it always is at least 10 bytes long.
567 */
568 if (len < 10 ||
569 memcmp(line, atat, 2) ||
570 !(ep = memmem(line + 2, len - 2, atat, 2))) {
571 emit_line(ecbdata->opt, context, reset, line, len);
572 return;
573 }
574 ep += 2; /* skip over @@ */
575
576 /* The hunk header in fraginfo color */
577 strbuf_addstr(&msgbuf, frag);
578 strbuf_add(&msgbuf, line, ep - line);
579 strbuf_addstr(&msgbuf, reset);
580
581 /*
582 * trailing "\r\n"
583 */
584 for ( ; i < 3; i++)
585 if (line[len - i] == '\r' || line[len - i] == '\n')
586 len--;
587
588 /* blank before the func header */
589 for (cp = ep; ep - line < len; ep++)
590 if (*ep != ' ' && *ep != '\t')
591 break;
592 if (ep != cp) {
593 strbuf_addstr(&msgbuf, context);
594 strbuf_add(&msgbuf, cp, ep - cp);
595 strbuf_addstr(&msgbuf, reset);
596 }
597
598 if (ep < line + len) {
599 strbuf_addstr(&msgbuf, func);
600 strbuf_add(&msgbuf, ep, line + len - ep);
601 strbuf_addstr(&msgbuf, reset);
602 }
603
604 strbuf_add(&msgbuf, line + len, org_len - len);
605 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
606 strbuf_release(&msgbuf);
607 }
608
609 static struct diff_tempfile *claim_diff_tempfile(void) {
610 int i;
611 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
612 if (!diff_temp[i].name)
613 return diff_temp + i;
614 die("BUG: diff is failing to clean up its tempfiles");
615 }
616
617 static void remove_tempfile(void)
618 {
619 int i;
620 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
621 if (is_tempfile_active(&diff_temp[i].tempfile))
622 delete_tempfile(&diff_temp[i].tempfile);
623 diff_temp[i].name = NULL;
624 }
625 }
626
627 static void print_line_count(FILE *file, int count)
628 {
629 switch (count) {
630 case 0:
631 fprintf(file, "0,0");
632 break;
633 case 1:
634 fprintf(file, "1");
635 break;
636 default:
637 fprintf(file, "1,%d", count);
638 break;
639 }
640 }
641
642 static void emit_rewrite_lines(struct emit_callback *ecb,
643 int prefix, const char *data, int size)
644 {
645 const char *endp = NULL;
646 static const char *nneof = " No newline at end of file\n";
647 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
648
649 while (0 < size) {
650 int len;
651
652 endp = memchr(data, '\n', size);
653 len = endp ? (endp - data + 1) : size;
654 if (prefix != '+') {
655 ecb->lno_in_preimage++;
656 emit_del_line(reset, ecb, data, len);
657 } else {
658 ecb->lno_in_postimage++;
659 emit_add_line(reset, ecb, data, len);
660 }
661 size -= len;
662 data += len;
663 }
664 if (!endp) {
665 const char *context = diff_get_color(ecb->color_diff,
666 DIFF_CONTEXT);
667 putc('\n', ecb->opt->file);
668 emit_line_0(ecb->opt, context, reset, '\\',
669 nneof, strlen(nneof));
670 }
671 }
672
673 static void emit_rewrite_diff(const char *name_a,
674 const char *name_b,
675 struct diff_filespec *one,
676 struct diff_filespec *two,
677 struct userdiff_driver *textconv_one,
678 struct userdiff_driver *textconv_two,
679 struct diff_options *o)
680 {
681 int lc_a, lc_b;
682 const char *name_a_tab, *name_b_tab;
683 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
684 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
685 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
686 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
687 const char *a_prefix, *b_prefix;
688 char *data_one, *data_two;
689 size_t size_one, size_two;
690 struct emit_callback ecbdata;
691 const char *line_prefix = diff_line_prefix(o);
692
693 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
694 a_prefix = o->b_prefix;
695 b_prefix = o->a_prefix;
696 } else {
697 a_prefix = o->a_prefix;
698 b_prefix = o->b_prefix;
699 }
700
701 name_a += (*name_a == '/');
702 name_b += (*name_b == '/');
703 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
704 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
705
706 strbuf_reset(&a_name);
707 strbuf_reset(&b_name);
708 quote_two_c_style(&a_name, a_prefix, name_a, 0);
709 quote_two_c_style(&b_name, b_prefix, name_b, 0);
710
711 size_one = fill_textconv(textconv_one, one, &data_one);
712 size_two = fill_textconv(textconv_two, two, &data_two);
713
714 memset(&ecbdata, 0, sizeof(ecbdata));
715 ecbdata.color_diff = want_color(o->use_color);
716 ecbdata.found_changesp = &o->found_changes;
717 ecbdata.ws_rule = whitespace_rule(name_b);
718 ecbdata.opt = o;
719 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
720 mmfile_t mf1, mf2;
721 mf1.ptr = (char *)data_one;
722 mf2.ptr = (char *)data_two;
723 mf1.size = size_one;
724 mf2.size = size_two;
725 check_blank_at_eof(&mf1, &mf2, &ecbdata);
726 }
727 ecbdata.lno_in_preimage = 1;
728 ecbdata.lno_in_postimage = 1;
729
730 lc_a = count_lines(data_one, size_one);
731 lc_b = count_lines(data_two, size_two);
732 fprintf(o->file,
733 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
734 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
735 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
736 line_prefix, fraginfo);
737 if (!o->irreversible_delete)
738 print_line_count(o->file, lc_a);
739 else
740 fprintf(o->file, "?,?");
741 fprintf(o->file, " +");
742 print_line_count(o->file, lc_b);
743 fprintf(o->file, " @@%s\n", reset);
744 if (lc_a && !o->irreversible_delete)
745 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
746 if (lc_b)
747 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
748 if (textconv_one)
749 free((char *)data_one);
750 if (textconv_two)
751 free((char *)data_two);
752 }
753
754 struct diff_words_buffer {
755 mmfile_t text;
756 long alloc;
757 struct diff_words_orig {
758 const char *begin, *end;
759 } *orig;
760 int orig_nr, orig_alloc;
761 };
762
763 static void diff_words_append(char *line, unsigned long len,
764 struct diff_words_buffer *buffer)
765 {
766 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
767 line++;
768 len--;
769 memcpy(buffer->text.ptr + buffer->text.size, line, len);
770 buffer->text.size += len;
771 buffer->text.ptr[buffer->text.size] = '\0';
772 }
773
774 struct diff_words_style_elem {
775 const char *prefix;
776 const char *suffix;
777 const char *color; /* NULL; filled in by the setup code if
778 * color is enabled */
779 };
780
781 struct diff_words_style {
782 enum diff_words_type type;
783 struct diff_words_style_elem new, old, ctx;
784 const char *newline;
785 };
786
787 static struct diff_words_style diff_words_styles[] = {
788 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
789 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
790 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
791 };
792
793 struct diff_words_data {
794 struct diff_words_buffer minus, plus;
795 const char *current_plus;
796 int last_minus;
797 struct diff_options *opt;
798 regex_t *word_regex;
799 enum diff_words_type type;
800 struct diff_words_style *style;
801 };
802
803 static int fn_out_diff_words_write_helper(FILE *fp,
804 struct diff_words_style_elem *st_el,
805 const char *newline,
806 size_t count, const char *buf,
807 const char *line_prefix)
808 {
809 int print = 0;
810
811 while (count) {
812 char *p = memchr(buf, '\n', count);
813 if (print)
814 fputs(line_prefix, fp);
815 if (p != buf) {
816 if (st_el->color && fputs(st_el->color, fp) < 0)
817 return -1;
818 if (fputs(st_el->prefix, fp) < 0 ||
819 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
820 fputs(st_el->suffix, fp) < 0)
821 return -1;
822 if (st_el->color && *st_el->color
823 && fputs(GIT_COLOR_RESET, fp) < 0)
824 return -1;
825 }
826 if (!p)
827 return 0;
828 if (fputs(newline, fp) < 0)
829 return -1;
830 count -= p + 1 - buf;
831 buf = p + 1;
832 print = 1;
833 }
834 return 0;
835 }
836
837 /*
838 * '--color-words' algorithm can be described as:
839 *
840 * 1. collect a the minus/plus lines of a diff hunk, divided into
841 * minus-lines and plus-lines;
842 *
843 * 2. break both minus-lines and plus-lines into words and
844 * place them into two mmfile_t with one word for each line;
845 *
846 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
847 *
848 * And for the common parts of the both file, we output the plus side text.
849 * diff_words->current_plus is used to trace the current position of the plus file
850 * which printed. diff_words->last_minus is used to trace the last minus word
851 * printed.
852 *
853 * For '--graph' to work with '--color-words', we need to output the graph prefix
854 * on each line of color words output. Generally, there are two conditions on
855 * which we should output the prefix.
856 *
857 * 1. diff_words->last_minus == 0 &&
858 * diff_words->current_plus == diff_words->plus.text.ptr
859 *
860 * that is: the plus text must start as a new line, and if there is no minus
861 * word printed, a graph prefix must be printed.
862 *
863 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
864 * *(diff_words->current_plus - 1) == '\n'
865 *
866 * that is: a graph prefix must be printed following a '\n'
867 */
868 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
869 {
870 if ((diff_words->last_minus == 0 &&
871 diff_words->current_plus == diff_words->plus.text.ptr) ||
872 (diff_words->current_plus > diff_words->plus.text.ptr &&
873 *(diff_words->current_plus - 1) == '\n')) {
874 return 1;
875 } else {
876 return 0;
877 }
878 }
879
880 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
881 {
882 struct diff_words_data *diff_words = priv;
883 struct diff_words_style *style = diff_words->style;
884 int minus_first, minus_len, plus_first, plus_len;
885 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
886 struct diff_options *opt = diff_words->opt;
887 const char *line_prefix;
888
889 if (line[0] != '@' || parse_hunk_header(line, len,
890 &minus_first, &minus_len, &plus_first, &plus_len))
891 return;
892
893 assert(opt);
894 line_prefix = diff_line_prefix(opt);
895
896 /* POSIX requires that first be decremented by one if len == 0... */
897 if (minus_len) {
898 minus_begin = diff_words->minus.orig[minus_first].begin;
899 minus_end =
900 diff_words->minus.orig[minus_first + minus_len - 1].end;
901 } else
902 minus_begin = minus_end =
903 diff_words->minus.orig[minus_first].end;
904
905 if (plus_len) {
906 plus_begin = diff_words->plus.orig[plus_first].begin;
907 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
908 } else
909 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
910
911 if (color_words_output_graph_prefix(diff_words)) {
912 fputs(line_prefix, diff_words->opt->file);
913 }
914 if (diff_words->current_plus != plus_begin) {
915 fn_out_diff_words_write_helper(diff_words->opt->file,
916 &style->ctx, style->newline,
917 plus_begin - diff_words->current_plus,
918 diff_words->current_plus, line_prefix);
919 if (*(plus_begin - 1) == '\n')
920 fputs(line_prefix, diff_words->opt->file);
921 }
922 if (minus_begin != minus_end) {
923 fn_out_diff_words_write_helper(diff_words->opt->file,
924 &style->old, style->newline,
925 minus_end - minus_begin, minus_begin,
926 line_prefix);
927 }
928 if (plus_begin != plus_end) {
929 fn_out_diff_words_write_helper(diff_words->opt->file,
930 &style->new, style->newline,
931 plus_end - plus_begin, plus_begin,
932 line_prefix);
933 }
934
935 diff_words->current_plus = plus_end;
936 diff_words->last_minus = minus_first;
937 }
938
939 /* This function starts looking at *begin, and returns 0 iff a word was found. */
940 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
941 int *begin, int *end)
942 {
943 if (word_regex && *begin < buffer->size) {
944 regmatch_t match[1];
945 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
946 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
947 '\n', match[0].rm_eo - match[0].rm_so);
948 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
949 *begin += match[0].rm_so;
950 return *begin >= *end;
951 }
952 return -1;
953 }
954
955 /* find the next word */
956 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
957 (*begin)++;
958 if (*begin >= buffer->size)
959 return -1;
960
961 /* find the end of the word */
962 *end = *begin + 1;
963 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
964 (*end)++;
965
966 return 0;
967 }
968
969 /*
970 * This function splits the words in buffer->text, stores the list with
971 * newline separator into out, and saves the offsets of the original words
972 * in buffer->orig.
973 */
974 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
975 regex_t *word_regex)
976 {
977 int i, j;
978 long alloc = 0;
979
980 out->size = 0;
981 out->ptr = NULL;
982
983 /* fake an empty "0th" word */
984 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
985 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
986 buffer->orig_nr = 1;
987
988 for (i = 0; i < buffer->text.size; i++) {
989 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
990 return;
991
992 /* store original boundaries */
993 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
994 buffer->orig_alloc);
995 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
996 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
997 buffer->orig_nr++;
998
999 /* store one word */
1000 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1001 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1002 out->ptr[out->size + j - i] = '\n';
1003 out->size += j - i + 1;
1004
1005 i = j - 1;
1006 }
1007 }
1008
1009 /* this executes the word diff on the accumulated buffers */
1010 static void diff_words_show(struct diff_words_data *diff_words)
1011 {
1012 xpparam_t xpp;
1013 xdemitconf_t xecfg;
1014 mmfile_t minus, plus;
1015 struct diff_words_style *style = diff_words->style;
1016
1017 struct diff_options *opt = diff_words->opt;
1018 const char *line_prefix;
1019
1020 assert(opt);
1021 line_prefix = diff_line_prefix(opt);
1022
1023 /* special case: only removal */
1024 if (!diff_words->plus.text.size) {
1025 fputs(line_prefix, diff_words->opt->file);
1026 fn_out_diff_words_write_helper(diff_words->opt->file,
1027 &style->old, style->newline,
1028 diff_words->minus.text.size,
1029 diff_words->minus.text.ptr, line_prefix);
1030 diff_words->minus.text.size = 0;
1031 return;
1032 }
1033
1034 diff_words->current_plus = diff_words->plus.text.ptr;
1035 diff_words->last_minus = 0;
1036
1037 memset(&xpp, 0, sizeof(xpp));
1038 memset(&xecfg, 0, sizeof(xecfg));
1039 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1040 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1041 xpp.flags = 0;
1042 /* as only the hunk header will be parsed, we need a 0-context */
1043 xecfg.ctxlen = 0;
1044 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1045 &xpp, &xecfg))
1046 die("unable to generate word diff");
1047 free(minus.ptr);
1048 free(plus.ptr);
1049 if (diff_words->current_plus != diff_words->plus.text.ptr +
1050 diff_words->plus.text.size) {
1051 if (color_words_output_graph_prefix(diff_words))
1052 fputs(line_prefix, diff_words->opt->file);
1053 fn_out_diff_words_write_helper(diff_words->opt->file,
1054 &style->ctx, style->newline,
1055 diff_words->plus.text.ptr + diff_words->plus.text.size
1056 - diff_words->current_plus, diff_words->current_plus,
1057 line_prefix);
1058 }
1059 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1060 }
1061
1062 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1063 static void diff_words_flush(struct emit_callback *ecbdata)
1064 {
1065 if (ecbdata->diff_words->minus.text.size ||
1066 ecbdata->diff_words->plus.text.size)
1067 diff_words_show(ecbdata->diff_words);
1068 }
1069
1070 static void diff_filespec_load_driver(struct diff_filespec *one)
1071 {
1072 /* Use already-loaded driver */
1073 if (one->driver)
1074 return;
1075
1076 if (S_ISREG(one->mode))
1077 one->driver = userdiff_find_by_path(one->path);
1078
1079 /* Fallback to default settings */
1080 if (!one->driver)
1081 one->driver = userdiff_find_by_name("default");
1082 }
1083
1084 static const char *userdiff_word_regex(struct diff_filespec *one)
1085 {
1086 diff_filespec_load_driver(one);
1087 return one->driver->word_regex;
1088 }
1089
1090 static void init_diff_words_data(struct emit_callback *ecbdata,
1091 struct diff_options *orig_opts,
1092 struct diff_filespec *one,
1093 struct diff_filespec *two)
1094 {
1095 int i;
1096 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1097 memcpy(o, orig_opts, sizeof(struct diff_options));
1098
1099 ecbdata->diff_words =
1100 xcalloc(1, sizeof(struct diff_words_data));
1101 ecbdata->diff_words->type = o->word_diff;
1102 ecbdata->diff_words->opt = o;
1103 if (!o->word_regex)
1104 o->word_regex = userdiff_word_regex(one);
1105 if (!o->word_regex)
1106 o->word_regex = userdiff_word_regex(two);
1107 if (!o->word_regex)
1108 o->word_regex = diff_word_regex_cfg;
1109 if (o->word_regex) {
1110 ecbdata->diff_words->word_regex = (regex_t *)
1111 xmalloc(sizeof(regex_t));
1112 if (regcomp(ecbdata->diff_words->word_regex,
1113 o->word_regex,
1114 REG_EXTENDED | REG_NEWLINE))
1115 die ("Invalid regular expression: %s",
1116 o->word_regex);
1117 }
1118 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1119 if (o->word_diff == diff_words_styles[i].type) {
1120 ecbdata->diff_words->style =
1121 &diff_words_styles[i];
1122 break;
1123 }
1124 }
1125 if (want_color(o->use_color)) {
1126 struct diff_words_style *st = ecbdata->diff_words->style;
1127 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1128 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1129 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1130 }
1131 }
1132
1133 static void free_diff_words_data(struct emit_callback *ecbdata)
1134 {
1135 if (ecbdata->diff_words) {
1136 diff_words_flush(ecbdata);
1137 free (ecbdata->diff_words->opt);
1138 free (ecbdata->diff_words->minus.text.ptr);
1139 free (ecbdata->diff_words->minus.orig);
1140 free (ecbdata->diff_words->plus.text.ptr);
1141 free (ecbdata->diff_words->plus.orig);
1142 if (ecbdata->diff_words->word_regex) {
1143 regfree(ecbdata->diff_words->word_regex);
1144 free(ecbdata->diff_words->word_regex);
1145 }
1146 free(ecbdata->diff_words);
1147 ecbdata->diff_words = NULL;
1148 }
1149 }
1150
1151 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1152 {
1153 if (want_color(diff_use_color))
1154 return diff_colors[ix];
1155 return "";
1156 }
1157
1158 const char *diff_line_prefix(struct diff_options *opt)
1159 {
1160 struct strbuf *msgbuf;
1161 if (!opt->output_prefix)
1162 return "";
1163
1164 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1165 return msgbuf->buf;
1166 }
1167
1168 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1169 {
1170 const char *cp;
1171 unsigned long allot;
1172 size_t l = len;
1173
1174 if (ecb->truncate)
1175 return ecb->truncate(line, len);
1176 cp = line;
1177 allot = l;
1178 while (0 < l) {
1179 (void) utf8_width(&cp, &l);
1180 if (!cp)
1181 break; /* truncated in the middle? */
1182 }
1183 return allot - l;
1184 }
1185
1186 static void find_lno(const char *line, struct emit_callback *ecbdata)
1187 {
1188 const char *p;
1189 ecbdata->lno_in_preimage = 0;
1190 ecbdata->lno_in_postimage = 0;
1191 p = strchr(line, '-');
1192 if (!p)
1193 return; /* cannot happen */
1194 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1195 p = strchr(p, '+');
1196 if (!p)
1197 return; /* cannot happen */
1198 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1199 }
1200
1201 static void fn_out_consume(void *priv, char *line, unsigned long len)
1202 {
1203 struct emit_callback *ecbdata = priv;
1204 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1205 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1206 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1207 struct diff_options *o = ecbdata->opt;
1208 const char *line_prefix = diff_line_prefix(o);
1209
1210 if (ecbdata->header) {
1211 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1212 strbuf_reset(ecbdata->header);
1213 ecbdata->header = NULL;
1214 }
1215 *(ecbdata->found_changesp) = 1;
1216
1217 if (ecbdata->label_path[0]) {
1218 const char *name_a_tab, *name_b_tab;
1219
1220 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1221 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1222
1223 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1224 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1225 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1226 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1227 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1228 }
1229
1230 if (diff_suppress_blank_empty
1231 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1232 line[0] = '\n';
1233 len = 1;
1234 }
1235
1236 if (line[0] == '@') {
1237 if (ecbdata->diff_words)
1238 diff_words_flush(ecbdata);
1239 len = sane_truncate_line(ecbdata, line, len);
1240 find_lno(line, ecbdata);
1241 emit_hunk_header(ecbdata, line, len);
1242 if (line[len-1] != '\n')
1243 putc('\n', ecbdata->opt->file);
1244 return;
1245 }
1246
1247 if (len < 1) {
1248 emit_line(ecbdata->opt, reset, reset, line, len);
1249 if (ecbdata->diff_words
1250 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1251 fputs("~\n", ecbdata->opt->file);
1252 return;
1253 }
1254
1255 if (ecbdata->diff_words) {
1256 if (line[0] == '-') {
1257 diff_words_append(line, len,
1258 &ecbdata->diff_words->minus);
1259 return;
1260 } else if (line[0] == '+') {
1261 diff_words_append(line, len,
1262 &ecbdata->diff_words->plus);
1263 return;
1264 } else if (starts_with(line, "\\ ")) {
1265 /*
1266 * Eat the "no newline at eof" marker as if we
1267 * saw a "+" or "-" line with nothing on it,
1268 * and return without diff_words_flush() to
1269 * defer processing. If this is the end of
1270 * preimage, more "+" lines may come after it.
1271 */
1272 return;
1273 }
1274 diff_words_flush(ecbdata);
1275 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1276 emit_line(ecbdata->opt, context, reset, line, len);
1277 fputs("~\n", ecbdata->opt->file);
1278 } else {
1279 /*
1280 * Skip the prefix character, if any. With
1281 * diff_suppress_blank_empty, there may be
1282 * none.
1283 */
1284 if (line[0] != '\n') {
1285 line++;
1286 len--;
1287 }
1288 emit_line(ecbdata->opt, context, reset, line, len);
1289 }
1290 return;
1291 }
1292
1293 switch (line[0]) {
1294 case '+':
1295 ecbdata->lno_in_postimage++;
1296 emit_add_line(reset, ecbdata, line + 1, len - 1);
1297 break;
1298 case '-':
1299 ecbdata->lno_in_preimage++;
1300 emit_del_line(reset, ecbdata, line + 1, len - 1);
1301 break;
1302 case ' ':
1303 ecbdata->lno_in_postimage++;
1304 ecbdata->lno_in_preimage++;
1305 emit_context_line(reset, ecbdata, line + 1, len - 1);
1306 break;
1307 default:
1308 /* incomplete line at the end */
1309 ecbdata->lno_in_preimage++;
1310 emit_line(ecbdata->opt,
1311 diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1312 reset, line, len);
1313 break;
1314 }
1315 }
1316
1317 static char *pprint_rename(const char *a, const char *b)
1318 {
1319 const char *old = a;
1320 const char *new = b;
1321 struct strbuf name = STRBUF_INIT;
1322 int pfx_length, sfx_length;
1323 int pfx_adjust_for_slash;
1324 int len_a = strlen(a);
1325 int len_b = strlen(b);
1326 int a_midlen, b_midlen;
1327 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1328 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1329
1330 if (qlen_a || qlen_b) {
1331 quote_c_style(a, &name, NULL, 0);
1332 strbuf_addstr(&name, " => ");
1333 quote_c_style(b, &name, NULL, 0);
1334 return strbuf_detach(&name, NULL);
1335 }
1336
1337 /* Find common prefix */
1338 pfx_length = 0;
1339 while (*old && *new && *old == *new) {
1340 if (*old == '/')
1341 pfx_length = old - a + 1;
1342 old++;
1343 new++;
1344 }
1345
1346 /* Find common suffix */
1347 old = a + len_a;
1348 new = b + len_b;
1349 sfx_length = 0;
1350 /*
1351 * If there is a common prefix, it must end in a slash. In
1352 * that case we let this loop run 1 into the prefix to see the
1353 * same slash.
1354 *
1355 * If there is no common prefix, we cannot do this as it would
1356 * underrun the input strings.
1357 */
1358 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1359 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1360 b + pfx_length - pfx_adjust_for_slash <= new &&
1361 *old == *new) {
1362 if (*old == '/')
1363 sfx_length = len_a - (old - a);
1364 old--;
1365 new--;
1366 }
1367
1368 /*
1369 * pfx{mid-a => mid-b}sfx
1370 * {pfx-a => pfx-b}sfx
1371 * pfx{sfx-a => sfx-b}
1372 * name-a => name-b
1373 */
1374 a_midlen = len_a - pfx_length - sfx_length;
1375 b_midlen = len_b - pfx_length - sfx_length;
1376 if (a_midlen < 0)
1377 a_midlen = 0;
1378 if (b_midlen < 0)
1379 b_midlen = 0;
1380
1381 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1382 if (pfx_length + sfx_length) {
1383 strbuf_add(&name, a, pfx_length);
1384 strbuf_addch(&name, '{');
1385 }
1386 strbuf_add(&name, a + pfx_length, a_midlen);
1387 strbuf_addstr(&name, " => ");
1388 strbuf_add(&name, b + pfx_length, b_midlen);
1389 if (pfx_length + sfx_length) {
1390 strbuf_addch(&name, '}');
1391 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1392 }
1393 return strbuf_detach(&name, NULL);
1394 }
1395
1396 struct diffstat_t {
1397 int nr;
1398 int alloc;
1399 struct diffstat_file {
1400 char *from_name;
1401 char *name;
1402 char *print_name;
1403 unsigned is_unmerged:1;
1404 unsigned is_binary:1;
1405 unsigned is_renamed:1;
1406 unsigned is_interesting:1;
1407 uintmax_t added, deleted;
1408 } **files;
1409 };
1410
1411 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1412 const char *name_a,
1413 const char *name_b)
1414 {
1415 struct diffstat_file *x;
1416 x = xcalloc(1, sizeof(*x));
1417 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1418 diffstat->files[diffstat->nr++] = x;
1419 if (name_b) {
1420 x->from_name = xstrdup(name_a);
1421 x->name = xstrdup(name_b);
1422 x->is_renamed = 1;
1423 }
1424 else {
1425 x->from_name = NULL;
1426 x->name = xstrdup(name_a);
1427 }
1428 return x;
1429 }
1430
1431 static void diffstat_consume(void *priv, char *line, unsigned long len)
1432 {
1433 struct diffstat_t *diffstat = priv;
1434 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1435
1436 if (line[0] == '+')
1437 x->added++;
1438 else if (line[0] == '-')
1439 x->deleted++;
1440 }
1441
1442 const char mime_boundary_leader[] = "------------";
1443
1444 static int scale_linear(int it, int width, int max_change)
1445 {
1446 if (!it)
1447 return 0;
1448 /*
1449 * make sure that at least one '-' or '+' is printed if
1450 * there is any change to this path. The easiest way is to
1451 * scale linearly as if the alloted width is one column shorter
1452 * than it is, and then add 1 to the result.
1453 */
1454 return 1 + (it * (width - 1) / max_change);
1455 }
1456
1457 static void show_name(FILE *file,
1458 const char *prefix, const char *name, int len)
1459 {
1460 fprintf(file, " %s%-*s |", prefix, len, name);
1461 }
1462
1463 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1464 {
1465 if (cnt <= 0)
1466 return;
1467 fprintf(file, "%s", set);
1468 while (cnt--)
1469 putc(ch, file);
1470 fprintf(file, "%s", reset);
1471 }
1472
1473 static void fill_print_name(struct diffstat_file *file)
1474 {
1475 char *pname;
1476
1477 if (file->print_name)
1478 return;
1479
1480 if (!file->is_renamed) {
1481 struct strbuf buf = STRBUF_INIT;
1482 if (quote_c_style(file->name, &buf, NULL, 0)) {
1483 pname = strbuf_detach(&buf, NULL);
1484 } else {
1485 pname = file->name;
1486 strbuf_release(&buf);
1487 }
1488 } else {
1489 pname = pprint_rename(file->from_name, file->name);
1490 }
1491 file->print_name = pname;
1492 }
1493
1494 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1495 {
1496 struct strbuf sb = STRBUF_INIT;
1497 int ret;
1498
1499 if (!files) {
1500 assert(insertions == 0 && deletions == 0);
1501 return fprintf(fp, "%s\n", " 0 files changed");
1502 }
1503
1504 strbuf_addf(&sb,
1505 (files == 1) ? " %d file changed" : " %d files changed",
1506 files);
1507
1508 /*
1509 * For binary diff, the caller may want to print "x files
1510 * changed" with insertions == 0 && deletions == 0.
1511 *
1512 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1513 * is probably less confusing (i.e skip over "2 files changed
1514 * but nothing about added/removed lines? Is this a bug in Git?").
1515 */
1516 if (insertions || deletions == 0) {
1517 strbuf_addf(&sb,
1518 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1519 insertions);
1520 }
1521
1522 if (deletions || insertions == 0) {
1523 strbuf_addf(&sb,
1524 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1525 deletions);
1526 }
1527 strbuf_addch(&sb, '\n');
1528 ret = fputs(sb.buf, fp);
1529 strbuf_release(&sb);
1530 return ret;
1531 }
1532
1533 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1534 {
1535 int i, len, add, del, adds = 0, dels = 0;
1536 uintmax_t max_change = 0, max_len = 0;
1537 int total_files = data->nr, count;
1538 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1539 const char *reset, *add_c, *del_c;
1540 const char *line_prefix = "";
1541 int extra_shown = 0;
1542
1543 if (data->nr == 0)
1544 return;
1545
1546 line_prefix = diff_line_prefix(options);
1547 count = options->stat_count ? options->stat_count : data->nr;
1548
1549 reset = diff_get_color_opt(options, DIFF_RESET);
1550 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1551 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1552
1553 /*
1554 * Find the longest filename and max number of changes
1555 */
1556 for (i = 0; (i < count) && (i < data->nr); i++) {
1557 struct diffstat_file *file = data->files[i];
1558 uintmax_t change = file->added + file->deleted;
1559
1560 if (!file->is_interesting && (change == 0)) {
1561 count++; /* not shown == room for one more */
1562 continue;
1563 }
1564 fill_print_name(file);
1565 len = strlen(file->print_name);
1566 if (max_len < len)
1567 max_len = len;
1568
1569 if (file->is_unmerged) {
1570 /* "Unmerged" is 8 characters */
1571 bin_width = bin_width < 8 ? 8 : bin_width;
1572 continue;
1573 }
1574 if (file->is_binary) {
1575 /* "Bin XXX -> YYY bytes" */
1576 int w = 14 + decimal_width(file->added)
1577 + decimal_width(file->deleted);
1578 bin_width = bin_width < w ? w : bin_width;
1579 /* Display change counts aligned with "Bin" */
1580 number_width = 3;
1581 continue;
1582 }
1583
1584 if (max_change < change)
1585 max_change = change;
1586 }
1587 count = i; /* where we can stop scanning in data->files[] */
1588
1589 /*
1590 * We have width = stat_width or term_columns() columns total.
1591 * We want a maximum of min(max_len, stat_name_width) for the name part.
1592 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1593 * We also need 1 for " " and 4 + decimal_width(max_change)
1594 * for " | NNNN " and one the empty column at the end, altogether
1595 * 6 + decimal_width(max_change).
1596 *
1597 * If there's not enough space, we will use the smaller of
1598 * stat_name_width (if set) and 5/8*width for the filename,
1599 * and the rest for constant elements + graph part, but no more
1600 * than stat_graph_width for the graph part.
1601 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1602 * for the standard terminal size).
1603 *
1604 * In other words: stat_width limits the maximum width, and
1605 * stat_name_width fixes the maximum width of the filename,
1606 * and is also used to divide available columns if there
1607 * aren't enough.
1608 *
1609 * Binary files are displayed with "Bin XXX -> YYY bytes"
1610 * instead of the change count and graph. This part is treated
1611 * similarly to the graph part, except that it is not
1612 * "scaled". If total width is too small to accommodate the
1613 * guaranteed minimum width of the filename part and the
1614 * separators and this message, this message will "overflow"
1615 * making the line longer than the maximum width.
1616 */
1617
1618 if (options->stat_width == -1)
1619 width = term_columns() - options->output_prefix_length;
1620 else
1621 width = options->stat_width ? options->stat_width : 80;
1622 number_width = decimal_width(max_change) > number_width ?
1623 decimal_width(max_change) : number_width;
1624
1625 if (options->stat_graph_width == -1)
1626 options->stat_graph_width = diff_stat_graph_width;
1627
1628 /*
1629 * Guarantee 3/8*16==6 for the graph part
1630 * and 5/8*16==10 for the filename part
1631 */
1632 if (width < 16 + 6 + number_width)
1633 width = 16 + 6 + number_width;
1634
1635 /*
1636 * First assign sizes that are wanted, ignoring available width.
1637 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1638 * starting from "XXX" should fit in graph_width.
1639 */
1640 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1641 if (options->stat_graph_width &&
1642 options->stat_graph_width < graph_width)
1643 graph_width = options->stat_graph_width;
1644
1645 name_width = (options->stat_name_width > 0 &&
1646 options->stat_name_width < max_len) ?
1647 options->stat_name_width : max_len;
1648
1649 /*
1650 * Adjust adjustable widths not to exceed maximum width
1651 */
1652 if (name_width + number_width + 6 + graph_width > width) {
1653 if (graph_width > width * 3/8 - number_width - 6) {
1654 graph_width = width * 3/8 - number_width - 6;
1655 if (graph_width < 6)
1656 graph_width = 6;
1657 }
1658
1659 if (options->stat_graph_width &&
1660 graph_width > options->stat_graph_width)
1661 graph_width = options->stat_graph_width;
1662 if (name_width > width - number_width - 6 - graph_width)
1663 name_width = width - number_width - 6 - graph_width;
1664 else
1665 graph_width = width - number_width - 6 - name_width;
1666 }
1667
1668 /*
1669 * From here name_width is the width of the name area,
1670 * and graph_width is the width of the graph area.
1671 * max_change is used to scale graph properly.
1672 */
1673 for (i = 0; i < count; i++) {
1674 const char *prefix = "";
1675 struct diffstat_file *file = data->files[i];
1676 char *name = file->print_name;
1677 uintmax_t added = file->added;
1678 uintmax_t deleted = file->deleted;
1679 int name_len;
1680
1681 if (!file->is_interesting && (added + deleted == 0))
1682 continue;
1683
1684 /*
1685 * "scale" the filename
1686 */
1687 len = name_width;
1688 name_len = strlen(name);
1689 if (name_width < name_len) {
1690 char *slash;
1691 prefix = "...";
1692 len -= 3;
1693 name += name_len - len;
1694 slash = strchr(name, '/');
1695 if (slash)
1696 name = slash;
1697 }
1698
1699 if (file->is_binary) {
1700 fprintf(options->file, "%s", line_prefix);
1701 show_name(options->file, prefix, name, len);
1702 fprintf(options->file, " %*s", number_width, "Bin");
1703 if (!added && !deleted) {
1704 putc('\n', options->file);
1705 continue;
1706 }
1707 fprintf(options->file, " %s%"PRIuMAX"%s",
1708 del_c, deleted, reset);
1709 fprintf(options->file, " -> ");
1710 fprintf(options->file, "%s%"PRIuMAX"%s",
1711 add_c, added, reset);
1712 fprintf(options->file, " bytes");
1713 fprintf(options->file, "\n");
1714 continue;
1715 }
1716 else if (file->is_unmerged) {
1717 fprintf(options->file, "%s", line_prefix);
1718 show_name(options->file, prefix, name, len);
1719 fprintf(options->file, " Unmerged\n");
1720 continue;
1721 }
1722
1723 /*
1724 * scale the add/delete
1725 */
1726 add = added;
1727 del = deleted;
1728
1729 if (graph_width <= max_change) {
1730 int total = scale_linear(add + del, graph_width, max_change);
1731 if (total < 2 && add && del)
1732 /* width >= 2 due to the sanity check */
1733 total = 2;
1734 if (add < del) {
1735 add = scale_linear(add, graph_width, max_change);
1736 del = total - add;
1737 } else {
1738 del = scale_linear(del, graph_width, max_change);
1739 add = total - del;
1740 }
1741 }
1742 fprintf(options->file, "%s", line_prefix);
1743 show_name(options->file, prefix, name, len);
1744 fprintf(options->file, " %*"PRIuMAX"%s",
1745 number_width, added + deleted,
1746 added + deleted ? " " : "");
1747 show_graph(options->file, '+', add, add_c, reset);
1748 show_graph(options->file, '-', del, del_c, reset);
1749 fprintf(options->file, "\n");
1750 }
1751
1752 for (i = 0; i < data->nr; i++) {
1753 struct diffstat_file *file = data->files[i];
1754 uintmax_t added = file->added;
1755 uintmax_t deleted = file->deleted;
1756
1757 if (file->is_unmerged ||
1758 (!file->is_interesting && (added + deleted == 0))) {
1759 total_files--;
1760 continue;
1761 }
1762
1763 if (!file->is_binary) {
1764 adds += added;
1765 dels += deleted;
1766 }
1767 if (i < count)
1768 continue;
1769 if (!extra_shown)
1770 fprintf(options->file, "%s ...\n", line_prefix);
1771 extra_shown = 1;
1772 }
1773 fprintf(options->file, "%s", line_prefix);
1774 print_stat_summary(options->file, total_files, adds, dels);
1775 }
1776
1777 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1778 {
1779 int i, adds = 0, dels = 0, total_files = data->nr;
1780
1781 if (data->nr == 0)
1782 return;
1783
1784 for (i = 0; i < data->nr; i++) {
1785 int added = data->files[i]->added;
1786 int deleted= data->files[i]->deleted;
1787
1788 if (data->files[i]->is_unmerged ||
1789 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1790 total_files--;
1791 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1792 adds += added;
1793 dels += deleted;
1794 }
1795 }
1796 fprintf(options->file, "%s", diff_line_prefix(options));
1797 print_stat_summary(options->file, total_files, adds, dels);
1798 }
1799
1800 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1801 {
1802 int i;
1803
1804 if (data->nr == 0)
1805 return;
1806
1807 for (i = 0; i < data->nr; i++) {
1808 struct diffstat_file *file = data->files[i];
1809
1810 fprintf(options->file, "%s", diff_line_prefix(options));
1811
1812 if (file->is_binary)
1813 fprintf(options->file, "-\t-\t");
1814 else
1815 fprintf(options->file,
1816 "%"PRIuMAX"\t%"PRIuMAX"\t",
1817 file->added, file->deleted);
1818 if (options->line_termination) {
1819 fill_print_name(file);
1820 if (!file->is_renamed)
1821 write_name_quoted(file->name, options->file,
1822 options->line_termination);
1823 else {
1824 fputs(file->print_name, options->file);
1825 putc(options->line_termination, options->file);
1826 }
1827 } else {
1828 if (file->is_renamed) {
1829 putc('\0', options->file);
1830 write_name_quoted(file->from_name, options->file, '\0');
1831 }
1832 write_name_quoted(file->name, options->file, '\0');
1833 }
1834 }
1835 }
1836
1837 struct dirstat_file {
1838 const char *name;
1839 unsigned long changed;
1840 };
1841
1842 struct dirstat_dir {
1843 struct dirstat_file *files;
1844 int alloc, nr, permille, cumulative;
1845 };
1846
1847 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1848 unsigned long changed, const char *base, int baselen)
1849 {
1850 unsigned long this_dir = 0;
1851 unsigned int sources = 0;
1852 const char *line_prefix = diff_line_prefix(opt);
1853
1854 while (dir->nr) {
1855 struct dirstat_file *f = dir->files;
1856 int namelen = strlen(f->name);
1857 unsigned long this;
1858 char *slash;
1859
1860 if (namelen < baselen)
1861 break;
1862 if (memcmp(f->name, base, baselen))
1863 break;
1864 slash = strchr(f->name + baselen, '/');
1865 if (slash) {
1866 int newbaselen = slash + 1 - f->name;
1867 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1868 sources++;
1869 } else {
1870 this = f->changed;
1871 dir->files++;
1872 dir->nr--;
1873 sources += 2;
1874 }
1875 this_dir += this;
1876 }
1877
1878 /*
1879 * We don't report dirstat's for
1880 * - the top level
1881 * - or cases where everything came from a single directory
1882 * under this directory (sources == 1).
1883 */
1884 if (baselen && sources != 1) {
1885 if (this_dir) {
1886 int permille = this_dir * 1000 / changed;
1887 if (permille >= dir->permille) {
1888 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1889 permille / 10, permille % 10, baselen, base);
1890 if (!dir->cumulative)
1891 return 0;
1892 }
1893 }
1894 }
1895 return this_dir;
1896 }
1897
1898 static int dirstat_compare(const void *_a, const void *_b)
1899 {
1900 const struct dirstat_file *a = _a;
1901 const struct dirstat_file *b = _b;
1902 return strcmp(a->name, b->name);
1903 }
1904
1905 static void show_dirstat(struct diff_options *options)
1906 {
1907 int i;
1908 unsigned long changed;
1909 struct dirstat_dir dir;
1910 struct diff_queue_struct *q = &diff_queued_diff;
1911
1912 dir.files = NULL;
1913 dir.alloc = 0;
1914 dir.nr = 0;
1915 dir.permille = options->dirstat_permille;
1916 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1917
1918 changed = 0;
1919 for (i = 0; i < q->nr; i++) {
1920 struct diff_filepair *p = q->queue[i];
1921 const char *name;
1922 unsigned long copied, added, damage;
1923 int content_changed;
1924
1925 name = p->two->path ? p->two->path : p->one->path;
1926
1927 if (p->one->sha1_valid && p->two->sha1_valid)
1928 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1929 else
1930 content_changed = 1;
1931
1932 if (!content_changed) {
1933 /*
1934 * The SHA1 has not changed, so pre-/post-content is
1935 * identical. We can therefore skip looking at the
1936 * file contents altogether.
1937 */
1938 damage = 0;
1939 goto found_damage;
1940 }
1941
1942 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1943 /*
1944 * In --dirstat-by-file mode, we don't really need to
1945 * look at the actual file contents at all.
1946 * The fact that the SHA1 changed is enough for us to
1947 * add this file to the list of results
1948 * (with each file contributing equal damage).
1949 */
1950 damage = 1;
1951 goto found_damage;
1952 }
1953
1954 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1955 diff_populate_filespec(p->one, 0);
1956 diff_populate_filespec(p->two, 0);
1957 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1958 &copied, &added);
1959 diff_free_filespec_data(p->one);
1960 diff_free_filespec_data(p->two);
1961 } else if (DIFF_FILE_VALID(p->one)) {
1962 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1963 copied = added = 0;
1964 diff_free_filespec_data(p->one);
1965 } else if (DIFF_FILE_VALID(p->two)) {
1966 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1967 copied = 0;
1968 added = p->two->size;
1969 diff_free_filespec_data(p->two);
1970 } else
1971 continue;
1972
1973 /*
1974 * Original minus copied is the removed material,
1975 * added is the new material. They are both damages
1976 * made to the preimage.
1977 * If the resulting damage is zero, we know that
1978 * diffcore_count_changes() considers the two entries to
1979 * be identical, but since content_changed is true, we
1980 * know that there must have been _some_ kind of change,
1981 * so we force all entries to have damage > 0.
1982 */
1983 damage = (p->one->size - copied) + added;
1984 if (!damage)
1985 damage = 1;
1986
1987 found_damage:
1988 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1989 dir.files[dir.nr].name = name;
1990 dir.files[dir.nr].changed = damage;
1991 changed += damage;
1992 dir.nr++;
1993 }
1994
1995 /* This can happen even with many files, if everything was renames */
1996 if (!changed)
1997 return;
1998
1999 /* Show all directories with more than x% of the changes */
2000 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2001 gather_dirstat(options, &dir, changed, "", 0);
2002 }
2003
2004 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2005 {
2006 int i;
2007 unsigned long changed;
2008 struct dirstat_dir dir;
2009
2010 if (data->nr == 0)
2011 return;
2012
2013 dir.files = NULL;
2014 dir.alloc = 0;
2015 dir.nr = 0;
2016 dir.permille = options->dirstat_permille;
2017 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2018
2019 changed = 0;
2020 for (i = 0; i < data->nr; i++) {
2021 struct diffstat_file *file = data->files[i];
2022 unsigned long damage = file->added + file->deleted;
2023 if (file->is_binary)
2024 /*
2025 * binary files counts bytes, not lines. Must find some
2026 * way to normalize binary bytes vs. textual lines.
2027 * The following heuristic assumes that there are 64
2028 * bytes per "line".
2029 * This is stupid and ugly, but very cheap...
2030 */
2031 damage = (damage + 63) / 64;
2032 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2033 dir.files[dir.nr].name = file->name;
2034 dir.files[dir.nr].changed = damage;
2035 changed += damage;
2036 dir.nr++;
2037 }
2038
2039 /* This can happen even with many files, if everything was renames */
2040 if (!changed)
2041 return;
2042
2043 /* Show all directories with more than x% of the changes */
2044 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2045 gather_dirstat(options, &dir, changed, "", 0);
2046 }
2047
2048 static void free_diffstat_info(struct diffstat_t *diffstat)
2049 {
2050 int i;
2051 for (i = 0; i < diffstat->nr; i++) {
2052 struct diffstat_file *f = diffstat->files[i];
2053 if (f->name != f->print_name)
2054 free(f->print_name);
2055 free(f->name);
2056 free(f->from_name);
2057 free(f);
2058 }
2059 free(diffstat->files);
2060 }
2061
2062 struct checkdiff_t {
2063 const char *filename;
2064 int lineno;
2065 int conflict_marker_size;
2066 struct diff_options *o;
2067 unsigned ws_rule;
2068 unsigned status;
2069 };
2070
2071 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2072 {
2073 char firstchar;
2074 int cnt;
2075
2076 if (len < marker_size + 1)
2077 return 0;
2078 firstchar = line[0];
2079 switch (firstchar) {
2080 case '=': case '>': case '<': case '|':
2081 break;
2082 default:
2083 return 0;
2084 }
2085 for (cnt = 1; cnt < marker_size; cnt++)
2086 if (line[cnt] != firstchar)
2087 return 0;
2088 /* line[1] thru line[marker_size-1] are same as firstchar */
2089 if (len < marker_size + 1 || !isspace(line[marker_size]))
2090 return 0;
2091 return 1;
2092 }
2093
2094 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2095 {
2096 struct checkdiff_t *data = priv;
2097 int marker_size = data->conflict_marker_size;
2098 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2099 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2100 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2101 char *err;
2102 const char *line_prefix;
2103
2104 assert(data->o);
2105 line_prefix = diff_line_prefix(data->o);
2106
2107 if (line[0] == '+') {
2108 unsigned bad;
2109 data->lineno++;
2110 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2111 data->status |= 1;
2112 fprintf(data->o->file,
2113 "%s%s:%d: leftover conflict marker\n",
2114 line_prefix, data->filename, data->lineno);
2115 }
2116 bad = ws_check(line + 1, len - 1, data->ws_rule);
2117 if (!bad)
2118 return;
2119 data->status |= bad;
2120 err = whitespace_error_string(bad);
2121 fprintf(data->o->file, "%s%s:%d: %s.\n",
2122 line_prefix, data->filename, data->lineno, err);
2123 free(err);
2124 emit_line(data->o, set, reset, line, 1);
2125 ws_check_emit(line + 1, len - 1, data->ws_rule,
2126 data->o->file, set, reset, ws);
2127 } else if (line[0] == ' ') {
2128 data->lineno++;
2129 } else if (line[0] == '@') {
2130 char *plus = strchr(line, '+');
2131 if (plus)
2132 data->lineno = strtol(plus, NULL, 10) - 1;
2133 else
2134 die("invalid diff");
2135 }
2136 }
2137
2138 static unsigned char *deflate_it(char *data,
2139 unsigned long size,
2140 unsigned long *result_size)
2141 {
2142 int bound;
2143 unsigned char *deflated;
2144 git_zstream stream;
2145
2146 git_deflate_init(&stream, zlib_compression_level);
2147 bound = git_deflate_bound(&stream, size);
2148 deflated = xmalloc(bound);
2149 stream.next_out = deflated;
2150 stream.avail_out = bound;
2151
2152 stream.next_in = (unsigned char *)data;
2153 stream.avail_in = size;
2154 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2155 ; /* nothing */
2156 git_deflate_end(&stream);
2157 *result_size = stream.total_out;
2158 return deflated;
2159 }
2160
2161 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2162 const char *prefix)
2163 {
2164 void *cp;
2165 void *delta;
2166 void *deflated;
2167 void *data;
2168 unsigned long orig_size;
2169 unsigned long delta_size;
2170 unsigned long deflate_size;
2171 unsigned long data_size;
2172
2173 /* We could do deflated delta, or we could do just deflated two,
2174 * whichever is smaller.
2175 */
2176 delta = NULL;
2177 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2178 if (one->size && two->size) {
2179 delta = diff_delta(one->ptr, one->size,
2180 two->ptr, two->size,
2181 &delta_size, deflate_size);
2182 if (delta) {
2183 void *to_free = delta;
2184 orig_size = delta_size;
2185 delta = deflate_it(delta, delta_size, &delta_size);
2186 free(to_free);
2187 }
2188 }
2189
2190 if (delta && delta_size < deflate_size) {
2191 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2192 free(deflated);
2193 data = delta;
2194 data_size = delta_size;
2195 }
2196 else {
2197 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2198 free(delta);
2199 data = deflated;
2200 data_size = deflate_size;
2201 }
2202
2203 /* emit data encoded in base85 */
2204 cp = data;
2205 while (data_size) {
2206 int bytes = (52 < data_size) ? 52 : data_size;
2207 char line[70];
2208 data_size -= bytes;
2209 if (bytes <= 26)
2210 line[0] = bytes + 'A' - 1;
2211 else
2212 line[0] = bytes - 26 + 'a' - 1;
2213 encode_85(line + 1, cp, bytes);
2214 cp = (char *) cp + bytes;
2215 fprintf(file, "%s", prefix);
2216 fputs(line, file);
2217 fputc('\n', file);
2218 }
2219 fprintf(file, "%s\n", prefix);
2220 free(data);
2221 }
2222
2223 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2224 const char *prefix)
2225 {
2226 fprintf(file, "%sGIT binary patch\n", prefix);
2227 emit_binary_diff_body(file, one, two, prefix);
2228 emit_binary_diff_body(file, two, one, prefix);
2229 }
2230
2231 int diff_filespec_is_binary(struct diff_filespec *one)
2232 {
2233 if (one->is_binary == -1) {
2234 diff_filespec_load_driver(one);
2235 if (one->driver->binary != -1)
2236 one->is_binary = one->driver->binary;
2237 else {
2238 if (!one->data && DIFF_FILE_VALID(one))
2239 diff_populate_filespec(one, CHECK_BINARY);
2240 if (one->is_binary == -1 && one->data)
2241 one->is_binary = buffer_is_binary(one->data,
2242 one->size);
2243 if (one->is_binary == -1)
2244 one->is_binary = 0;
2245 }
2246 }
2247 return one->is_binary;
2248 }
2249
2250 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2251 {
2252 diff_filespec_load_driver(one);
2253 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2254 }
2255
2256 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2257 {
2258 if (!options->a_prefix)
2259 options->a_prefix = a;
2260 if (!options->b_prefix)
2261 options->b_prefix = b;
2262 }
2263
2264 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2265 {
2266 if (!DIFF_FILE_VALID(one))
2267 return NULL;
2268
2269 diff_filespec_load_driver(one);
2270 return userdiff_get_textconv(one->driver);
2271 }
2272
2273 static void builtin_diff(const char *name_a,
2274 const char *name_b,
2275 struct diff_filespec *one,
2276 struct diff_filespec *two,
2277 const char *xfrm_msg,
2278 int must_show_header,
2279 struct diff_options *o,
2280 int complete_rewrite)
2281 {
2282 mmfile_t mf1, mf2;
2283 const char *lbl[2];
2284 char *a_one, *b_two;
2285 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2286 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2287 const char *a_prefix, *b_prefix;
2288 struct userdiff_driver *textconv_one = NULL;
2289 struct userdiff_driver *textconv_two = NULL;
2290 struct strbuf header = STRBUF_INIT;
2291 const char *line_prefix = diff_line_prefix(o);
2292
2293 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2294 (!one->mode || S_ISGITLINK(one->mode)) &&
2295 (!two->mode || S_ISGITLINK(two->mode))) {
2296 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2297 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2298 show_submodule_summary(o->file, one->path ? one->path : two->path,
2299 line_prefix,
2300 one->sha1, two->sha1, two->dirty_submodule,
2301 meta, del, add, reset);
2302 return;
2303 }
2304
2305 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2306 textconv_one = get_textconv(one);
2307 textconv_two = get_textconv(two);
2308 }
2309
2310 diff_set_mnemonic_prefix(o, "a/", "b/");
2311 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2312 a_prefix = o->b_prefix;
2313 b_prefix = o->a_prefix;
2314 } else {
2315 a_prefix = o->a_prefix;
2316 b_prefix = o->b_prefix;
2317 }
2318
2319 /* Never use a non-valid filename anywhere if at all possible */
2320 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2321 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2322
2323 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2324 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2325 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2326 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2327 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2328 if (lbl[0][0] == '/') {
2329 /* /dev/null */
2330 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2331 if (xfrm_msg)
2332 strbuf_addstr(&header, xfrm_msg);
2333 must_show_header = 1;
2334 }
2335 else if (lbl[1][0] == '/') {
2336 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2337 if (xfrm_msg)
2338 strbuf_addstr(&header, xfrm_msg);
2339 must_show_header = 1;
2340 }
2341 else {
2342 if (one->mode != two->mode) {
2343 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2344 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2345 must_show_header = 1;
2346 }
2347 if (xfrm_msg)
2348 strbuf_addstr(&header, xfrm_msg);
2349
2350 /*
2351 * we do not run diff between different kind
2352 * of objects.
2353 */
2354 if ((one->mode ^ two->mode) & S_IFMT)
2355 goto free_ab_and_return;
2356 if (complete_rewrite &&
2357 (textconv_one || !diff_filespec_is_binary(one)) &&
2358 (textconv_two || !diff_filespec_is_binary(two))) {
2359 fprintf(o->file, "%s", header.buf);
2360 strbuf_reset(&header);
2361 emit_rewrite_diff(name_a, name_b, one, two,
2362 textconv_one, textconv_two, o);
2363 o->found_changes = 1;
2364 goto free_ab_and_return;
2365 }
2366 }
2367
2368 if (o->irreversible_delete && lbl[1][0] == '/') {
2369 fprintf(o->file, "%s", header.buf);
2370 strbuf_reset(&header);
2371 goto free_ab_and_return;
2372 } else if (!DIFF_OPT_TST(o, TEXT) &&
2373 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2374 (!textconv_two && diff_filespec_is_binary(two)) )) {
2375 if (!one->data && !two->data &&
2376 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2377 !DIFF_OPT_TST(o, BINARY)) {
2378 if (!hashcmp(one->sha1, two->sha1)) {
2379 if (must_show_header)
2380 fprintf(o->file, "%s", header.buf);
2381 goto free_ab_and_return;
2382 }
2383 fprintf(o->file, "%s", header.buf);
2384 fprintf(o->file, "%sBinary files %s and %s differ\n",
2385 line_prefix, lbl[0], lbl[1]);
2386 goto free_ab_and_return;
2387 }
2388 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2389 die("unable to read files to diff");
2390 /* Quite common confusing case */
2391 if (mf1.size == mf2.size &&
2392 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2393 if (must_show_header)
2394 fprintf(o->file, "%s", header.buf);
2395 goto free_ab_and_return;
2396 }
2397 fprintf(o->file, "%s", header.buf);
2398 strbuf_reset(&header);
2399 if (DIFF_OPT_TST(o, BINARY))
2400 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2401 else
2402 fprintf(o->file, "%sBinary files %s and %s differ\n",
2403 line_prefix, lbl[0], lbl[1]);
2404 o->found_changes = 1;
2405 } else {
2406 /* Crazy xdl interfaces.. */
2407 const char *diffopts = getenv("GIT_DIFF_OPTS");
2408 const char *v;
2409 xpparam_t xpp;
2410 xdemitconf_t xecfg;
2411 struct emit_callback ecbdata;
2412 const struct userdiff_funcname *pe;
2413
2414 if (must_show_header) {
2415 fprintf(o->file, "%s", header.buf);
2416 strbuf_reset(&header);
2417 }
2418
2419 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2420 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2421
2422 pe = diff_funcname_pattern(one);
2423 if (!pe)
2424 pe = diff_funcname_pattern(two);
2425
2426 memset(&xpp, 0, sizeof(xpp));
2427 memset(&xecfg, 0, sizeof(xecfg));
2428 memset(&ecbdata, 0, sizeof(ecbdata));
2429 ecbdata.label_path = lbl;
2430 ecbdata.color_diff = want_color(o->use_color);
2431 ecbdata.found_changesp = &o->found_changes;
2432 ecbdata.ws_rule = whitespace_rule(name_b);
2433 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2434 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2435 ecbdata.opt = o;
2436 ecbdata.header = header.len ? &header : NULL;
2437 xpp.flags = o->xdl_opts;
2438 xecfg.ctxlen = o->context;
2439 xecfg.interhunkctxlen = o->interhunkcontext;
2440 xecfg.flags = XDL_EMIT_FUNCNAMES;
2441 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2442 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2443 if (pe)
2444 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2445 if (!diffopts)
2446 ;
2447 else if (skip_prefix(diffopts, "--unified=", &v))
2448 xecfg.ctxlen = strtoul(v, NULL, 10);
2449 else if (skip_prefix(diffopts, "-u", &v))
2450 xecfg.ctxlen = strtoul(v, NULL, 10);
2451 if (o->word_diff)
2452 init_diff_words_data(&ecbdata, o, one, two);
2453 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2454 &xpp, &xecfg))
2455 die("unable to generate diff for %s", one->path);
2456 if (o->word_diff)
2457 free_diff_words_data(&ecbdata);
2458 if (textconv_one)
2459 free(mf1.ptr);
2460 if (textconv_two)
2461 free(mf2.ptr);
2462 xdiff_clear_find_func(&xecfg);
2463 }
2464
2465 free_ab_and_return:
2466 strbuf_release(&header);
2467 diff_free_filespec_data(one);
2468 diff_free_filespec_data(two);
2469 free(a_one);
2470 free(b_two);
2471 return;
2472 }
2473
2474 static void builtin_diffstat(const char *name_a, const char *name_b,
2475 struct diff_filespec *one,
2476 struct diff_filespec *two,
2477 struct diffstat_t *diffstat,
2478 struct diff_options *o,
2479 struct diff_filepair *p)
2480 {
2481 mmfile_t mf1, mf2;
2482 struct diffstat_file *data;
2483 int same_contents;
2484 int complete_rewrite = 0;
2485
2486 if (!DIFF_PAIR_UNMERGED(p)) {
2487 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2488 complete_rewrite = 1;
2489 }
2490
2491 data = diffstat_add(diffstat, name_a, name_b);
2492 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2493
2494 if (!one || !two) {
2495 data->is_unmerged = 1;
2496 return;
2497 }
2498
2499 same_contents = !hashcmp(one->sha1, two->sha1);
2500
2501 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2502 data->is_binary = 1;
2503 if (same_contents) {
2504 data->added = 0;
2505 data->deleted = 0;
2506 } else {
2507 data->added = diff_filespec_size(two);
2508 data->deleted = diff_filespec_size(one);
2509 }
2510 }
2511
2512 else if (complete_rewrite) {
2513 diff_populate_filespec(one, 0);
2514 diff_populate_filespec(two, 0);
2515 data->deleted = count_lines(one->data, one->size);
2516 data->added = count_lines(two->data, two->size);
2517 }
2518
2519 else if (!same_contents) {
2520 /* Crazy xdl interfaces.. */
2521 xpparam_t xpp;
2522 xdemitconf_t xecfg;
2523
2524 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2525 die("unable to read files to diff");
2526
2527 memset(&xpp, 0, sizeof(xpp));
2528 memset(&xecfg, 0, sizeof(xecfg));
2529 xpp.flags = o->xdl_opts;
2530 xecfg.ctxlen = o->context;
2531 xecfg.interhunkctxlen = o->interhunkcontext;
2532 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2533 &xpp, &xecfg))
2534 die("unable to generate diffstat for %s", one->path);
2535 }
2536
2537 diff_free_filespec_data(one);
2538 diff_free_filespec_data(two);
2539 }
2540
2541 static void builtin_checkdiff(const char *name_a, const char *name_b,
2542 const char *attr_path,
2543 struct diff_filespec *one,
2544 struct diff_filespec *two,
2545 struct diff_options *o)
2546 {
2547 mmfile_t mf1, mf2;
2548 struct checkdiff_t data;
2549
2550 if (!two)
2551 return;
2552
2553 memset(&data, 0, sizeof(data));
2554 data.filename = name_b ? name_b : name_a;
2555 data.lineno = 0;
2556 data.o = o;
2557 data.ws_rule = whitespace_rule(attr_path);
2558 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2559
2560 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2561 die("unable to read files to diff");
2562
2563 /*
2564 * All the other codepaths check both sides, but not checking
2565 * the "old" side here is deliberate. We are checking the newly
2566 * introduced changes, and as long as the "new" side is text, we
2567 * can and should check what it introduces.
2568 */
2569 if (diff_filespec_is_binary(two))
2570 goto free_and_return;
2571 else {
2572 /* Crazy xdl interfaces.. */
2573 xpparam_t xpp;
2574 xdemitconf_t xecfg;
2575
2576 memset(&xpp, 0, sizeof(xpp));
2577 memset(&xecfg, 0, sizeof(xecfg));
2578 xecfg.ctxlen = 1; /* at least one context line */
2579 xpp.flags = 0;
2580 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2581 &xpp, &xecfg))
2582 die("unable to generate checkdiff for %s", one->path);
2583
2584 if (data.ws_rule & WS_BLANK_AT_EOF) {
2585 struct emit_callback ecbdata;
2586 int blank_at_eof;
2587
2588 ecbdata.ws_rule = data.ws_rule;
2589 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2590 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2591
2592 if (blank_at_eof) {
2593 static char *err;
2594 if (!err)
2595 err = whitespace_error_string(WS_BLANK_AT_EOF);
2596 fprintf(o->file, "%s:%d: %s.\n",
2597 data.filename, blank_at_eof, err);
2598 data.status = 1; /* report errors */
2599 }
2600 }
2601 }
2602 free_and_return:
2603 diff_free_filespec_data(one);
2604 diff_free_filespec_data(two);
2605 if (data.status)
2606 DIFF_OPT_SET(o, CHECK_FAILED);
2607 }
2608
2609 struct diff_filespec *alloc_filespec(const char *path)
2610 {
2611 int namelen = strlen(path);
2612 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2613
2614 memset(spec, 0, sizeof(*spec));
2615 spec->path = (char *)(spec + 1);
2616 memcpy(spec->path, path, namelen+1);
2617 spec->count = 1;
2618 spec->is_binary = -1;
2619 return spec;
2620 }
2621
2622 void free_filespec(struct diff_filespec *spec)
2623 {
2624 if (!--spec->count) {
2625 diff_free_filespec_data(spec);
2626 free(spec);
2627 }
2628 }
2629
2630 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2631 int sha1_valid, unsigned short mode)
2632 {
2633 if (mode) {
2634 spec->mode = canon_mode(mode);
2635 hashcpy(spec->sha1, sha1);
2636 spec->sha1_valid = sha1_valid;
2637 }
2638 }
2639
2640 /*
2641 * Given a name and sha1 pair, if the index tells us the file in
2642 * the work tree has that object contents, return true, so that
2643 * prepare_temp_file() does not have to inflate and extract.
2644 */
2645 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2646 {
2647 const struct cache_entry *ce;
2648 struct stat st;
2649 int pos, len;
2650
2651 /*
2652 * We do not read the cache ourselves here, because the
2653 * benchmark with my previous version that always reads cache
2654 * shows that it makes things worse for diff-tree comparing
2655 * two linux-2.6 kernel trees in an already checked out work
2656 * tree. This is because most diff-tree comparisons deal with
2657 * only a small number of files, while reading the cache is
2658 * expensive for a large project, and its cost outweighs the
2659 * savings we get by not inflating the object to a temporary
2660 * file. Practically, this code only helps when we are used
2661 * by diff-cache --cached, which does read the cache before
2662 * calling us.
2663 */
2664 if (!active_cache)
2665 return 0;
2666
2667 /* We want to avoid the working directory if our caller
2668 * doesn't need the data in a normal file, this system
2669 * is rather slow with its stat/open/mmap/close syscalls,
2670 * and the object is contained in a pack file. The pack
2671 * is probably already open and will be faster to obtain
2672 * the data through than the working directory. Loose
2673 * objects however would tend to be slower as they need
2674 * to be individually opened and inflated.
2675 */
2676 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2677 return 0;
2678
2679 len = strlen(name);
2680 pos = cache_name_pos(name, len);
2681 if (pos < 0)
2682 return 0;
2683 ce = active_cache[pos];
2684
2685 /*
2686 * This is not the sha1 we are looking for, or
2687 * unreusable because it is not a regular file.
2688 */
2689 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2690 return 0;
2691
2692 /*
2693 * If ce is marked as "assume unchanged", there is no
2694 * guarantee that work tree matches what we are looking for.
2695 */
2696 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2697 return 0;
2698
2699 /*
2700 * If ce matches the file in the work tree, we can reuse it.
2701 */
2702 if (ce_uptodate(ce) ||
2703 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2704 return 1;
2705
2706 return 0;
2707 }
2708
2709 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2710 {
2711 int len;
2712 char *data = xmalloc(100), *dirty = "";
2713
2714 /* Are we looking at the work tree? */
2715 if (s->dirty_submodule)
2716 dirty = "-dirty";
2717
2718 len = snprintf(data, 100,
2719 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2720 s->data = data;
2721 s->size = len;
2722 s->should_free = 1;
2723 if (size_only) {
2724 s->data = NULL;
2725 free(data);
2726 }
2727 return 0;
2728 }
2729
2730 /*
2731 * While doing rename detection and pickaxe operation, we may need to
2732 * grab the data for the blob (or file) for our own in-core comparison.
2733 * diff_filespec has data and size fields for this purpose.
2734 */
2735 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2736 {
2737 int size_only = flags & CHECK_SIZE_ONLY;
2738 int err = 0;
2739 /*
2740 * demote FAIL to WARN to allow inspecting the situation
2741 * instead of refusing.
2742 */
2743 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2744 ? SAFE_CRLF_WARN
2745 : safe_crlf);
2746
2747 if (!DIFF_FILE_VALID(s))
2748 die("internal error: asking to populate invalid file.");
2749 if (S_ISDIR(s->mode))
2750 return -1;
2751
2752 if (s->data)
2753 return 0;
2754
2755 if (size_only && 0 < s->size)
2756 return 0;
2757
2758 if (S_ISGITLINK(s->mode))
2759 return diff_populate_gitlink(s, size_only);
2760
2761 if (!s->sha1_valid ||
2762 reuse_worktree_file(s->path, s->sha1, 0)) {
2763 struct strbuf buf = STRBUF_INIT;
2764 struct stat st;
2765 int fd;
2766
2767 if (lstat(s->path, &st) < 0) {
2768 if (errno == ENOENT) {
2769 err_empty:
2770 err = -1;
2771 empty:
2772 s->data = (char *)"";
2773 s->size = 0;
2774 return err;
2775 }
2776 }
2777 s->size = xsize_t(st.st_size);
2778 if (!s->size)
2779 goto empty;
2780 if (S_ISLNK(st.st_mode)) {
2781 struct strbuf sb = STRBUF_INIT;
2782
2783 if (strbuf_readlink(&sb, s->path, s->size))
2784 goto err_empty;
2785 s->size = sb.len;
2786 s->data = strbuf_detach(&sb, NULL);
2787 s->should_free = 1;
2788 return 0;
2789 }
2790 if (size_only)
2791 return 0;
2792 if ((flags & CHECK_BINARY) &&
2793 s->size > big_file_threshold && s->is_binary == -1) {
2794 s->is_binary = 1;
2795 return 0;
2796 }
2797 fd = open(s->path, O_RDONLY);
2798 if (fd < 0)
2799 goto err_empty;
2800 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2801 close(fd);
2802 s->should_munmap = 1;
2803
2804 /*
2805 * Convert from working tree format to canonical git format
2806 */
2807 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2808 size_t size = 0;
2809 munmap(s->data, s->size);
2810 s->should_munmap = 0;
2811 s->data = strbuf_detach(&buf, &size);
2812 s->size = size;
2813 s->should_free = 1;
2814 }
2815 }
2816 else {
2817 enum object_type type;
2818 if (size_only || (flags & CHECK_BINARY)) {
2819 type = sha1_object_info(s->sha1, &s->size);
2820 if (type < 0)
2821 die("unable to read %s", sha1_to_hex(s->sha1));
2822 if (size_only)
2823 return 0;
2824 if (s->size > big_file_threshold && s->is_binary == -1) {
2825 s->is_binary = 1;
2826 return 0;
2827 }
2828 }
2829 s->data = read_sha1_file(s->sha1, &type, &s->size);
2830 if (!s->data)
2831 die("unable to read %s", sha1_to_hex(s->sha1));
2832 s->should_free = 1;
2833 }
2834 return 0;
2835 }
2836
2837 void diff_free_filespec_blob(struct diff_filespec *s)
2838 {
2839 if (s->should_free)
2840 free(s->data);
2841 else if (s->should_munmap)
2842 munmap(s->data, s->size);
2843
2844 if (s->should_free || s->should_munmap) {
2845 s->should_free = s->should_munmap = 0;
2846 s->data = NULL;
2847 }
2848 }
2849
2850 void diff_free_filespec_data(struct diff_filespec *s)
2851 {
2852 diff_free_filespec_blob(s);
2853 free(s->cnt_data);
2854 s->cnt_data = NULL;
2855 }
2856
2857 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2858 void *blob,
2859 unsigned long size,
2860 const unsigned char *sha1,
2861 int mode)
2862 {
2863 int fd;
2864 struct strbuf buf = STRBUF_INIT;
2865 struct strbuf template = STRBUF_INIT;
2866 char *path_dup = xstrdup(path);
2867 const char *base = basename(path_dup);
2868
2869 /* Generate "XXXXXX_basename.ext" */
2870 strbuf_addstr(&template, "XXXXXX_");
2871 strbuf_addstr(&template, base);
2872
2873 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2874 if (fd < 0)
2875 die_errno("unable to create temp-file");
2876 if (convert_to_working_tree(path,
2877 (const char *)blob, (size_t)size, &buf)) {
2878 blob = buf.buf;
2879 size = buf.len;
2880 }
2881 if (write_in_full(fd, blob, size) != size)
2882 die_errno("unable to write temp-file");
2883 close_tempfile(&temp->tempfile);
2884 temp->name = get_tempfile_path(&temp->tempfile);
2885 strcpy(temp->hex, sha1_to_hex(sha1));
2886 temp->hex[40] = 0;
2887 sprintf(temp->mode, "%06o", mode);
2888 strbuf_release(&buf);
2889 strbuf_release(&template);
2890 free(path_dup);
2891 }
2892
2893 static struct diff_tempfile *prepare_temp_file(const char *name,
2894 struct diff_filespec *one)
2895 {
2896 struct diff_tempfile *temp = claim_diff_tempfile();
2897
2898 if (!DIFF_FILE_VALID(one)) {
2899 not_a_valid_file:
2900 /* A '-' entry produces this for file-2, and
2901 * a '+' entry produces this for file-1.
2902 */
2903 temp->name = "/dev/null";
2904 strcpy(temp->hex, ".");
2905 strcpy(temp->mode, ".");
2906 return temp;
2907 }
2908
2909 if (!S_ISGITLINK(one->mode) &&
2910 (!one->sha1_valid ||
2911 reuse_worktree_file(name, one->sha1, 1))) {
2912 struct stat st;
2913 if (lstat(name, &st) < 0) {
2914 if (errno == ENOENT)
2915 goto not_a_valid_file;
2916 die_errno("stat(%s)", name);
2917 }
2918 if (S_ISLNK(st.st_mode)) {
2919 struct strbuf sb = STRBUF_INIT;
2920 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2921 die_errno("readlink(%s)", name);
2922 prep_temp_blob(name, temp, sb.buf, sb.len,
2923 (one->sha1_valid ?
2924 one->sha1 : null_sha1),
2925 (one->sha1_valid ?
2926 one->mode : S_IFLNK));
2927 strbuf_release(&sb);
2928 }
2929 else {
2930 /* we can borrow from the file in the work tree */
2931 temp->name = name;
2932 if (!one->sha1_valid)
2933 strcpy(temp->hex, sha1_to_hex(null_sha1));
2934 else
2935 strcpy(temp->hex, sha1_to_hex(one->sha1));
2936 /* Even though we may sometimes borrow the
2937 * contents from the work tree, we always want
2938 * one->mode. mode is trustworthy even when
2939 * !(one->sha1_valid), as long as
2940 * DIFF_FILE_VALID(one).
2941 */
2942 sprintf(temp->mode, "%06o", one->mode);
2943 }
2944 return temp;
2945 }
2946 else {
2947 if (diff_populate_filespec(one, 0))
2948 die("cannot read data blob for %s", one->path);
2949 prep_temp_blob(name, temp, one->data, one->size,
2950 one->sha1, one->mode);
2951 }
2952 return temp;
2953 }
2954
2955 static void add_external_diff_name(struct argv_array *argv,
2956 const char *name,
2957 struct diff_filespec *df)
2958 {
2959 struct diff_tempfile *temp = prepare_temp_file(name, df);
2960 argv_array_push(argv, temp->name);
2961 argv_array_push(argv, temp->hex);
2962 argv_array_push(argv, temp->mode);
2963 }
2964
2965 /* An external diff command takes:
2966 *
2967 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2968 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2969 *
2970 */
2971 static void run_external_diff(const char *pgm,
2972 const char *name,
2973 const char *other,
2974 struct diff_filespec *one,
2975 struct diff_filespec *two,
2976 const char *xfrm_msg,
2977 int complete_rewrite,
2978 struct diff_options *o)
2979 {
2980 struct argv_array argv = ARGV_ARRAY_INIT;
2981 struct argv_array env = ARGV_ARRAY_INIT;
2982 struct diff_queue_struct *q = &diff_queued_diff;
2983
2984 argv_array_push(&argv, pgm);
2985 argv_array_push(&argv, name);
2986
2987 if (one && two) {
2988 add_external_diff_name(&argv, name, one);
2989 if (!other)
2990 add_external_diff_name(&argv, name, two);
2991 else {
2992 add_external_diff_name(&argv, other, two);
2993 argv_array_push(&argv, other);
2994 argv_array_push(&argv, xfrm_msg);
2995 }
2996 }
2997
2998 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2999 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3000
3001 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3002 die(_("external diff died, stopping at %s"), name);
3003
3004 remove_tempfile();
3005 argv_array_clear(&argv);
3006 argv_array_clear(&env);
3007 }
3008
3009 static int similarity_index(struct diff_filepair *p)
3010 {
3011 return p->score * 100 / MAX_SCORE;
3012 }
3013
3014 static void fill_metainfo(struct strbuf *msg,
3015 const char *name,
3016 const char *other,
3017 struct diff_filespec *one,
3018 struct diff_filespec *two,
3019 struct diff_options *o,
3020 struct diff_filepair *p,
3021 int *must_show_header,
3022 int use_color)
3023 {
3024 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3025 const char *reset = diff_get_color(use_color, DIFF_RESET);
3026 const char *line_prefix = diff_line_prefix(o);
3027
3028 *must_show_header = 1;
3029 strbuf_init(msg, PATH_MAX * 2 + 300);
3030 switch (p->status) {
3031 case DIFF_STATUS_COPIED:
3032 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3033 line_prefix, set, similarity_index(p));
3034 strbuf_addf(msg, "%s\n%s%scopy from ",
3035 reset, line_prefix, set);
3036 quote_c_style(name, msg, NULL, 0);
3037 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3038 quote_c_style(other, msg, NULL, 0);
3039 strbuf_addf(msg, "%s\n", reset);
3040 break;
3041 case DIFF_STATUS_RENAMED:
3042 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3043 line_prefix, set, similarity_index(p));
3044 strbuf_addf(msg, "%s\n%s%srename from ",
3045 reset, line_prefix, set);
3046 quote_c_style(name, msg, NULL, 0);
3047 strbuf_addf(msg, "%s\n%s%srename to ",
3048 reset, line_prefix, set);
3049 quote_c_style(other, msg, NULL, 0);
3050 strbuf_addf(msg, "%s\n", reset);
3051 break;
3052 case DIFF_STATUS_MODIFIED:
3053 if (p->score) {
3054 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3055 line_prefix,
3056 set, similarity_index(p), reset);
3057 break;
3058 }
3059 /* fallthru */
3060 default:
3061 *must_show_header = 0;
3062 }
3063 if (one && two && hashcmp(one->sha1, two->sha1)) {
3064 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3065
3066 if (DIFF_OPT_TST(o, BINARY)) {
3067 mmfile_t mf;
3068 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3069 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3070 abbrev = 40;
3071 }
3072 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3073 find_unique_abbrev(one->sha1, abbrev));
3074 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3075 if (one->mode == two->mode)
3076 strbuf_addf(msg, " %06o", one->mode);
3077 strbuf_addf(msg, "%s\n", reset);
3078 }
3079 }
3080
3081 static void run_diff_cmd(const char *pgm,
3082 const char *name,
3083 const char *other,
3084 const char *attr_path,
3085 struct diff_filespec *one,
3086 struct diff_filespec *two,
3087 struct strbuf *msg,
3088 struct diff_options *o,
3089 struct diff_filepair *p)
3090 {
3091 const char *xfrm_msg = NULL;
3092 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3093 int must_show_header = 0;
3094
3095
3096 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3097 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3098 if (drv && drv->external)
3099 pgm = drv->external;
3100 }
3101
3102 if (msg) {
3103 /*
3104 * don't use colors when the header is intended for an
3105 * external diff driver
3106 */
3107 fill_metainfo(msg, name, other, one, two, o, p,
3108 &must_show_header,
3109 want_color(o->use_color) && !pgm);
3110 xfrm_msg = msg->len ? msg->buf : NULL;
3111 }
3112
3113 if (pgm) {
3114 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3115 complete_rewrite, o);
3116 return;
3117 }
3118 if (one && two)
3119 builtin_diff(name, other ? other : name,
3120 one, two, xfrm_msg, must_show_header,
3121 o, complete_rewrite);
3122 else
3123 fprintf(o->file, "* Unmerged path %s\n", name);
3124 }
3125
3126 static void diff_fill_sha1_info(struct diff_filespec *one)
3127 {
3128 if (DIFF_FILE_VALID(one)) {
3129 if (!one->sha1_valid) {
3130 struct stat st;
3131 if (one->is_stdin) {
3132 hashcpy(one->sha1, null_sha1);
3133 return;
3134 }
3135 if (lstat(one->path, &st) < 0)
3136 die_errno("stat '%s'", one->path);
3137 if (index_path(one->sha1, one->path, &st, 0))
3138 die("cannot hash %s", one->path);
3139 }
3140 }
3141 else
3142 hashclr(one->sha1);
3143 }
3144
3145 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3146 {
3147 /* Strip the prefix but do not molest /dev/null and absolute paths */
3148 if (*namep && **namep != '/') {
3149 *namep += prefix_length;
3150 if (**namep == '/')
3151 ++*namep;
3152 }
3153 if (*otherp && **otherp != '/') {
3154 *otherp += prefix_length;
3155 if (**otherp == '/')
3156 ++*otherp;
3157 }
3158 }
3159
3160 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3161 {
3162 const char *pgm = external_diff();
3163 struct strbuf msg;
3164 struct diff_filespec *one = p->one;
3165 struct diff_filespec *two = p->two;
3166 const char *name;
3167 const char *other;
3168 const char *attr_path;
3169
3170 name = p->one->path;
3171 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3172 attr_path = name;
3173 if (o->prefix_length)
3174 strip_prefix(o->prefix_length, &name, &other);
3175
3176 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3177 pgm = NULL;
3178
3179 if (DIFF_PAIR_UNMERGED(p)) {
3180 run_diff_cmd(pgm, name, NULL, attr_path,
3181 NULL, NULL, NULL, o, p);
3182 return;
3183 }
3184
3185 diff_fill_sha1_info(one);
3186 diff_fill_sha1_info(two);
3187
3188 if (!pgm &&
3189 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3190 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3191 /*
3192 * a filepair that changes between file and symlink
3193 * needs to be split into deletion and creation.
3194 */
3195 struct diff_filespec *null = alloc_filespec(two->path);
3196 run_diff_cmd(NULL, name, other, attr_path,
3197 one, null, &msg, o, p);
3198 free(null);
3199 strbuf_release(&msg);
3200
3201 null = alloc_filespec(one->path);
3202 run_diff_cmd(NULL, name, other, attr_path,
3203 null, two, &msg, o, p);
3204 free(null);
3205 }
3206 else
3207 run_diff_cmd(pgm, name, other, attr_path,
3208 one, two, &msg, o, p);
3209
3210 strbuf_release(&msg);
3211 }
3212
3213 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3214 struct diffstat_t *diffstat)
3215 {
3216 const char *name;
3217 const char *other;
3218
3219 if (DIFF_PAIR_UNMERGED(p)) {
3220 /* unmerged */
3221 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3222 return;
3223 }
3224
3225 name = p->one->path;
3226 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3227
3228 if (o->prefix_length)
3229 strip_prefix(o->prefix_length, &name, &other);
3230
3231 diff_fill_sha1_info(p->one);
3232 diff_fill_sha1_info(p->two);
3233
3234 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3235 }
3236
3237 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3238 {
3239 const char *name;
3240 const char *other;
3241 const char *attr_path;
3242
3243 if (DIFF_PAIR_UNMERGED(p)) {
3244 /* unmerged */
3245 return;
3246 }
3247
3248 name = p->one->path;
3249 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3250 attr_path = other ? other : name;
3251
3252 if (o->prefix_length)
3253 strip_prefix(o->prefix_length, &name, &other);
3254
3255 diff_fill_sha1_info(p->one);
3256 diff_fill_sha1_info(p->two);
3257
3258 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3259 }
3260
3261 void diff_setup(struct diff_options *options)
3262 {
3263 memcpy(options, &default_diff_options, sizeof(*options));
3264
3265 options->file = stdout;
3266
3267 options->line_termination = '\n';
3268 options->break_opt = -1;
3269 options->rename_limit = -1;
3270 options->dirstat_permille = diff_dirstat_permille_default;
3271 options->context = diff_context_default;
3272 options->ws_error_highlight = WSEH_NEW;
3273 DIFF_OPT_SET(options, RENAME_EMPTY);
3274
3275 /* pathchange left =NULL by default */
3276 options->change = diff_change;
3277 options->add_remove = diff_addremove;
3278 options->use_color = diff_use_color_default;
3279 options->detect_rename = diff_detect_rename_default;
3280 options->xdl_opts |= diff_algorithm;
3281
3282 options->orderfile = diff_order_file_cfg;
3283
3284 if (diff_no_prefix) {
3285 options->a_prefix = options->b_prefix = "";
3286 } else if (!diff_mnemonic_prefix) {
3287 options->a_prefix = "a/";
3288 options->b_prefix = "b/";
3289 }
3290 }
3291
3292 void diff_setup_done(struct diff_options *options)
3293 {
3294 int count = 0;
3295
3296 if (options->set_default)
3297 options->set_default(options);
3298
3299 if (options->output_format & DIFF_FORMAT_NAME)
3300 count++;
3301 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3302 count++;
3303 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3304 count++;
3305 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3306 count++;
3307 if (count > 1)
3308 die("--name-only, --name-status, --check and -s are mutually exclusive");
3309
3310 /*
3311 * Most of the time we can say "there are changes"
3312 * only by checking if there are changed paths, but
3313 * --ignore-whitespace* options force us to look
3314 * inside contents.
3315 */
3316
3317 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3318 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3319 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3320 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3321 else
3322 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3323
3324 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3325 options->detect_rename = DIFF_DETECT_COPY;
3326
3327 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3328 options->prefix = NULL;
3329 if (options->prefix)
3330 options->prefix_length = strlen(options->prefix);
3331 else
3332 options->prefix_length = 0;
3333
3334 if (options->output_format & (DIFF_FORMAT_NAME |
3335 DIFF_FORMAT_NAME_STATUS |
3336 DIFF_FORMAT_CHECKDIFF |
3337 DIFF_FORMAT_NO_OUTPUT))
3338 options->output_format &= ~(DIFF_FORMAT_RAW |
3339 DIFF_FORMAT_NUMSTAT |
3340 DIFF_FORMAT_DIFFSTAT |
3341 DIFF_FORMAT_SHORTSTAT |
3342 DIFF_FORMAT_DIRSTAT |
3343 DIFF_FORMAT_SUMMARY |
3344 DIFF_FORMAT_PATCH);
3345
3346 /*
3347 * These cases always need recursive; we do not drop caller-supplied
3348 * recursive bits for other formats here.
3349 */
3350 if (options->output_format & (DIFF_FORMAT_PATCH |
3351 DIFF_FORMAT_NUMSTAT |
3352 DIFF_FORMAT_DIFFSTAT |
3353 DIFF_FORMAT_SHORTSTAT |
3354 DIFF_FORMAT_DIRSTAT |
3355 DIFF_FORMAT_SUMMARY |
3356 DIFF_FORMAT_CHECKDIFF))
3357 DIFF_OPT_SET(options, RECURSIVE);
3358 /*
3359 * Also pickaxe would not work very well if you do not say recursive
3360 */
3361 if (options->pickaxe)
3362 DIFF_OPT_SET(options, RECURSIVE);
3363 /*
3364 * When patches are generated, submodules diffed against the work tree
3365 * must be checked for dirtiness too so it can be shown in the output
3366 */
3367 if (options->output_format & DIFF_FORMAT_PATCH)
3368 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3369
3370 if (options->detect_rename && options->rename_limit < 0)
3371 options->rename_limit = diff_rename_limit_default;
3372 if (options->setup & DIFF_SETUP_USE_CACHE) {
3373 if (!active_cache)
3374 /* read-cache does not die even when it fails
3375 * so it is safe for us to do this here. Also
3376 * it does not smudge active_cache or active_nr
3377 * when it fails, so we do not have to worry about
3378 * cleaning it up ourselves either.
3379 */
3380 read_cache();
3381 }
3382 if (options->abbrev <= 0 || 40 < options->abbrev)
3383 options->abbrev = 40; /* full */
3384
3385 /*
3386 * It does not make sense to show the first hit we happened
3387 * to have found. It does not make sense not to return with
3388 * exit code in such a case either.
3389 */
3390 if (DIFF_OPT_TST(options, QUICK)) {
3391 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3392 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3393 }
3394
3395 options->diff_path_counter = 0;
3396
3397 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3398 die(_("--follow requires exactly one pathspec"));
3399 }
3400
3401 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3402 {
3403 char c, *eq;
3404 int len;
3405
3406 if (*arg != '-')
3407 return 0;
3408 c = *++arg;
3409 if (!c)
3410 return 0;
3411 if (c == arg_short) {
3412 c = *++arg;
3413 if (!c)
3414 return 1;
3415 if (val && isdigit(c)) {
3416 char *end;
3417 int n = strtoul(arg, &end, 10);
3418 if (*end)
3419 return 0;
3420 *val = n;
3421 return 1;
3422 }
3423 return 0;
3424 }
3425 if (c != '-')
3426 return 0;
3427 arg++;
3428 eq = strchrnul(arg, '=');
3429 len = eq - arg;
3430 if (!len || strncmp(arg, arg_long, len))
3431 return 0;
3432 if (*eq) {
3433 int n;
3434 char *end;
3435 if (!isdigit(*++eq))
3436 return 0;
3437 n = strtoul(eq, &end, 10);
3438 if (*end)
3439 return 0;
3440 *val = n;
3441 }
3442 return 1;
3443 }
3444
3445 static int diff_scoreopt_parse(const char *opt);
3446
3447 static inline int short_opt(char opt, const char **argv,
3448 const char **optarg)
3449 {
3450 const char *arg = argv[0];
3451 if (arg[0] != '-' || arg[1] != opt)
3452 return 0;
3453 if (arg[2] != '\0') {
3454 *optarg = arg + 2;
3455 return 1;
3456 }
3457 if (!argv[1])
3458 die("Option '%c' requires a value", opt);
3459 *optarg = argv[1];
3460 return 2;
3461 }
3462
3463 int parse_long_opt(const char *opt, const char **argv,
3464 const char **optarg)
3465 {
3466 const char *arg = argv[0];
3467 if (!skip_prefix(arg, "--", &arg))
3468 return 0;
3469 if (!skip_prefix(arg, opt, &arg))
3470 return 0;
3471 if (*arg == '=') { /* stuck form: --option=value */
3472 *optarg = arg + 1;
3473 return 1;
3474 }
3475 if (*arg != '\0')
3476 return 0;
3477 /* separate form: --option value */
3478 if (!argv[1])
3479 die("Option '--%s' requires a value", opt);
3480 *optarg = argv[1];
3481 return 2;
3482 }
3483
3484 static int stat_opt(struct diff_options *options, const char **av)
3485 {
3486 const char *arg = av[0];
3487 char *end;
3488 int width = options->stat_width;
3489 int name_width = options->stat_name_width;
3490 int graph_width = options->stat_graph_width;
3491 int count = options->stat_count;
3492 int argcount = 1;
3493
3494 if (!skip_prefix(arg, "--stat", &arg))
3495 die("BUG: stat option does not begin with --stat: %s", arg);
3496 end = (char *)arg;
3497
3498 switch (*arg) {
3499 case '-':
3500 if (skip_prefix(arg, "-width", &arg)) {
3501 if (*arg == '=')
3502 width = strtoul(arg + 1, &end, 10);
3503 else if (!*arg && !av[1])
3504 die("Option '--stat-width' requires a value");
3505 else if (!*arg) {
3506 width = strtoul(av[1], &end, 10);
3507 argcount = 2;
3508 }
3509 } else if (skip_prefix(arg, "-name-width", &arg)) {
3510 if (*arg == '=')
3511 name_width = strtoul(arg + 1, &end, 10);
3512 else if (!*arg && !av[1])
3513 die("Option '--stat-name-width' requires a value");
3514 else if (!*arg) {
3515 name_width = strtoul(av[1], &end, 10);
3516 argcount = 2;
3517 }
3518 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3519 if (*arg == '=')
3520 graph_width = strtoul(arg + 1, &end, 10);
3521 else if (!*arg && !av[1])
3522 die("Option '--stat-graph-width' requires a value");
3523 else if (!*arg) {
3524 graph_width = strtoul(av[1], &end, 10);
3525 argcount = 2;
3526 }
3527 } else if (skip_prefix(arg, "-count", &arg)) {
3528 if (*arg == '=')
3529 count = strtoul(arg + 1, &end, 10);
3530 else if (!*arg && !av[1])
3531 die("Option '--stat-count' requires a value");
3532 else if (!*arg) {
3533 count = strtoul(av[1], &end, 10);
3534 argcount = 2;
3535 }
3536 }
3537 break;
3538 case '=':
3539 width = strtoul(arg+1, &end, 10);
3540 if (*end == ',')
3541 name_width = strtoul(end+1, &end, 10);
3542 if (*end == ',')
3543 count = strtoul(end+1, &end, 10);
3544 }
3545
3546 /* Important! This checks all the error cases! */
3547 if (*end)
3548 return 0;
3549 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3550 options->stat_name_width = name_width;
3551 options->stat_graph_width = graph_width;
3552 options->stat_width = width;
3553 options->stat_count = count;
3554 return argcount;
3555 }
3556
3557 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3558 {
3559 struct strbuf errmsg = STRBUF_INIT;
3560 if (parse_dirstat_params(options, params, &errmsg))
3561 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3562 errmsg.buf);
3563 strbuf_release(&errmsg);
3564 /*
3565 * The caller knows a dirstat-related option is given from the command
3566 * line; allow it to say "return this_function();"
3567 */
3568 options->output_format |= DIFF_FORMAT_DIRSTAT;
3569 return 1;
3570 }
3571
3572 static int parse_submodule_opt(struct diff_options *options, const char *value)
3573 {
3574 if (parse_submodule_params(options, value))
3575 die(_("Failed to parse --submodule option parameter: '%s'"),
3576 value);
3577 return 1;
3578 }
3579
3580 static const char diff_status_letters[] = {
3581 DIFF_STATUS_ADDED,
3582 DIFF_STATUS_COPIED,
3583 DIFF_STATUS_DELETED,
3584 DIFF_STATUS_MODIFIED,
3585 DIFF_STATUS_RENAMED,
3586 DIFF_STATUS_TYPE_CHANGED,
3587 DIFF_STATUS_UNKNOWN,
3588 DIFF_STATUS_UNMERGED,
3589 DIFF_STATUS_FILTER_AON,
3590 DIFF_STATUS_FILTER_BROKEN,
3591 '\0',
3592 };
3593
3594 static unsigned int filter_bit['Z' + 1];
3595
3596 static void prepare_filter_bits(void)
3597 {
3598 int i;
3599
3600 if (!filter_bit[DIFF_STATUS_ADDED]) {
3601 for (i = 0; diff_status_letters[i]; i++)
3602 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3603 }
3604 }
3605
3606 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3607 {
3608 return opt->filter & filter_bit[(int) status];
3609 }
3610
3611 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3612 {
3613 int i, optch;
3614
3615 prepare_filter_bits();
3616
3617 /*
3618 * If there is a negation e.g. 'd' in the input, and we haven't
3619 * initialized the filter field with another --diff-filter, start
3620 * from full set of bits, except for AON.
3621 */
3622 if (!opt->filter) {
3623 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3624 if (optch < 'a' || 'z' < optch)
3625 continue;
3626 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3627 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3628 break;
3629 }
3630 }
3631
3632 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3633 unsigned int bit;
3634 int negate;
3635
3636 if ('a' <= optch && optch <= 'z') {
3637 negate = 1;
3638 optch = toupper(optch);
3639 } else {
3640 negate = 0;
3641 }
3642
3643 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3644 if (!bit)
3645 return optarg[i];
3646 if (negate)
3647 opt->filter &= ~bit;
3648 else
3649 opt->filter |= bit;
3650 }
3651 return 0;
3652 }
3653
3654 static void enable_patch_output(int *fmt) {
3655 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3656 *fmt |= DIFF_FORMAT_PATCH;
3657 }
3658
3659 static int parse_one_token(const char **arg, const char *token)
3660 {
3661 const char *rest;
3662 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3663 *arg = rest;
3664 return 1;
3665 }
3666 return 0;
3667 }
3668
3669 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3670 {
3671 const char *orig_arg = arg;
3672 unsigned val = 0;
3673 while (*arg) {
3674 if (parse_one_token(&arg, "none"))
3675 val = 0;
3676 else if (parse_one_token(&arg, "default"))
3677 val = WSEH_NEW;
3678 else if (parse_one_token(&arg, "all"))
3679 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3680 else if (parse_one_token(&arg, "new"))
3681 val |= WSEH_NEW;
3682 else if (parse_one_token(&arg, "old"))
3683 val |= WSEH_OLD;
3684 else if (parse_one_token(&arg, "context"))
3685 val |= WSEH_CONTEXT;
3686 else {
3687 error("unknown value after ws-error-highlight=%.*s",
3688 (int)(arg - orig_arg), orig_arg);
3689 return 0;
3690 }
3691 if (*arg)
3692 arg++;
3693 }
3694 opt->ws_error_highlight = val;
3695 return 1;
3696 }
3697
3698 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3699 {
3700 const char *arg = av[0];
3701 const char *optarg;
3702 int argcount;
3703
3704 /* Output format options */
3705 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3706 || opt_arg(arg, 'U', "unified", &options->context))
3707 enable_patch_output(&options->output_format);
3708 else if (!strcmp(arg, "--raw"))
3709 options->output_format |= DIFF_FORMAT_RAW;
3710 else if (!strcmp(arg, "--patch-with-raw")) {
3711 enable_patch_output(&options->output_format);
3712 options->output_format |= DIFF_FORMAT_RAW;
3713 } else if (!strcmp(arg, "--numstat"))
3714 options->output_format |= DIFF_FORMAT_NUMSTAT;
3715 else if (!strcmp(arg, "--shortstat"))
3716 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3717 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3718 return parse_dirstat_opt(options, "");
3719 else if (skip_prefix(arg, "-X", &arg))
3720 return parse_dirstat_opt(options, arg);
3721 else if (skip_prefix(arg, "--dirstat=", &arg))
3722 return parse_dirstat_opt(options, arg);
3723 else if (!strcmp(arg, "--cumulative"))
3724 return parse_dirstat_opt(options, "cumulative");
3725 else if (!strcmp(arg, "--dirstat-by-file"))
3726 return parse_dirstat_opt(options, "files");
3727 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3728 parse_dirstat_opt(options, "files");
3729 return parse_dirstat_opt(options, arg);
3730 }
3731 else if (!strcmp(arg, "--check"))
3732 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3733 else if (!strcmp(arg, "--summary"))
3734 options->output_format |= DIFF_FORMAT_SUMMARY;
3735 else if (!strcmp(arg, "--patch-with-stat")) {
3736 enable_patch_output(&options->output_format);
3737 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3738 } else if (!strcmp(arg, "--name-only"))
3739 options->output_format |= DIFF_FORMAT_NAME;
3740 else if (!strcmp(arg, "--name-status"))
3741 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3742 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3743 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3744 else if (starts_with(arg, "--stat"))
3745 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3746 return stat_opt(options, av);
3747
3748 /* renames options */
3749 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3750 !strcmp(arg, "--break-rewrites")) {
3751 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3752 return error("invalid argument to -B: %s", arg+2);
3753 }
3754 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3755 !strcmp(arg, "--find-renames")) {
3756 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3757 return error("invalid argument to -M: %s", arg+2);
3758 options->detect_rename = DIFF_DETECT_RENAME;
3759 }
3760 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3761 options->irreversible_delete = 1;
3762 }
3763 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3764 !strcmp(arg, "--find-copies")) {
3765 if (options->detect_rename == DIFF_DETECT_COPY)
3766 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3767 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3768 return error("invalid argument to -C: %s", arg+2);
3769 options->detect_rename = DIFF_DETECT_COPY;
3770 }
3771 else if (!strcmp(arg, "--no-renames"))
3772 options->detect_rename = 0;
3773 else if (!strcmp(arg, "--rename-empty"))
3774 DIFF_OPT_SET(options, RENAME_EMPTY);
3775 else if (!strcmp(arg, "--no-rename-empty"))
3776 DIFF_OPT_CLR(options, RENAME_EMPTY);
3777 else if (!strcmp(arg, "--relative"))
3778 DIFF_OPT_SET(options, RELATIVE_NAME);
3779 else if (skip_prefix(arg, "--relative=", &arg)) {
3780 DIFF_OPT_SET(options, RELATIVE_NAME);
3781 options->prefix = arg;
3782 }
3783
3784 /* xdiff options */
3785 else if (!strcmp(arg, "--minimal"))
3786 DIFF_XDL_SET(options, NEED_MINIMAL);
3787 else if (!strcmp(arg, "--no-minimal"))
3788 DIFF_XDL_CLR(options, NEED_MINIMAL);
3789 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3790 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3791 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3792 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3793 else if (!strcmp(arg, "--ignore-space-at-eol"))
3794 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3795 else if (!strcmp(arg, "--ignore-blank-lines"))
3796 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3797 else if (!strcmp(arg, "--patience"))
3798 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3799 else if (!strcmp(arg, "--histogram"))
3800 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3801 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3802 long value = parse_algorithm_value(optarg);
3803 if (value < 0)
3804 return error("option diff-algorithm accepts \"myers\", "
3805 "\"minimal\", \"patience\" and \"histogram\"");
3806 /* clear out previous settings */
3807 DIFF_XDL_CLR(options, NEED_MINIMAL);
3808 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3809 options->xdl_opts |= value;
3810 return argcount;
3811 }
3812
3813 /* flags options */
3814 else if (!strcmp(arg, "--binary")) {
3815 enable_patch_output(&options->output_format);
3816 DIFF_OPT_SET(options, BINARY);
3817 }
3818 else if (!strcmp(arg, "--full-index"))
3819 DIFF_OPT_SET(options, FULL_INDEX);
3820 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3821 DIFF_OPT_SET(options, TEXT);
3822 else if (!strcmp(arg, "-R"))
3823 DIFF_OPT_SET(options, REVERSE_DIFF);
3824 else if (!strcmp(arg, "--find-copies-harder"))
3825 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3826 else if (!strcmp(arg, "--follow"))
3827 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3828 else if (!strcmp(arg, "--no-follow")) {
3829 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3830 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3831 } else if (!strcmp(arg, "--color"))
3832 options->use_color = 1;
3833 else if (skip_prefix(arg, "--color=", &arg)) {
3834 int value = git_config_colorbool(NULL, arg);
3835 if (value < 0)
3836 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3837 options->use_color = value;
3838 }
3839 else if (!strcmp(arg, "--no-color"))
3840 options->use_color = 0;
3841 else if (!strcmp(arg, "--color-words")) {
3842 options->use_color = 1;
3843 options->word_diff = DIFF_WORDS_COLOR;
3844 }
3845 else if (skip_prefix(arg, "--color-words=", &arg)) {
3846 options->use_color = 1;
3847 options->word_diff = DIFF_WORDS_COLOR;
3848 options->word_regex = arg;
3849 }
3850 else if (!strcmp(arg, "--word-diff")) {
3851 if (options->word_diff == DIFF_WORDS_NONE)
3852 options->word_diff = DIFF_WORDS_PLAIN;
3853 }
3854 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3855 if (!strcmp(arg, "plain"))
3856 options->word_diff = DIFF_WORDS_PLAIN;
3857 else if (!strcmp(arg, "color")) {
3858 options->use_color = 1;
3859 options->word_diff = DIFF_WORDS_COLOR;
3860 }
3861 else if (!strcmp(arg, "porcelain"))
3862 options->word_diff = DIFF_WORDS_PORCELAIN;
3863 else if (!strcmp(arg, "none"))
3864 options->word_diff = DIFF_WORDS_NONE;
3865 else
3866 die("bad --word-diff argument: %s", arg);
3867 }
3868 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3869 if (options->word_diff == DIFF_WORDS_NONE)
3870 options->word_diff = DIFF_WORDS_PLAIN;
3871 options->word_regex = optarg;
3872 return argcount;
3873 }
3874 else if (!strcmp(arg, "--exit-code"))
3875 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3876 else if (!strcmp(arg, "--quiet"))
3877 DIFF_OPT_SET(options, QUICK);
3878 else if (!strcmp(arg, "--ext-diff"))
3879 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3880 else if (!strcmp(arg, "--no-ext-diff"))
3881 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3882 else if (!strcmp(arg, "--textconv"))
3883 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3884 else if (!strcmp(arg, "--no-textconv"))
3885 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3886 else if (!strcmp(arg, "--ignore-submodules")) {
3887 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3888 handle_ignore_submodules_arg(options, "all");
3889 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3890 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3891 handle_ignore_submodules_arg(options, arg);
3892 } else if (!strcmp(arg, "--submodule"))
3893 DIFF_OPT_SET(options, SUBMODULE_LOG);
3894 else if (skip_prefix(arg, "--submodule=", &arg))
3895 return parse_submodule_opt(options, arg);
3896 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3897 return parse_ws_error_highlight(options, arg);
3898
3899 /* misc options */
3900 else if (!strcmp(arg, "-z"))
3901 options->line_termination = 0;
3902 else if ((argcount = short_opt('l', av, &optarg))) {
3903 options->rename_limit = strtoul(optarg, NULL, 10);
3904 return argcount;
3905 }
3906 else if ((argcount = short_opt('S', av, &optarg))) {
3907 options->pickaxe = optarg;
3908 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3909 return argcount;
3910 } else if ((argcount = short_opt('G', av, &optarg))) {
3911 options->pickaxe = optarg;
3912 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3913 return argcount;
3914 }
3915 else if (!strcmp(arg, "--pickaxe-all"))
3916 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3917 else if (!strcmp(arg, "--pickaxe-regex"))
3918 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3919 else if ((argcount = short_opt('O', av, &optarg))) {
3920 options->orderfile = optarg;
3921 return argcount;
3922 }
3923 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3924 int offending = parse_diff_filter_opt(optarg, options);
3925 if (offending)
3926 die("unknown change class '%c' in --diff-filter=%s",
3927 offending, optarg);
3928 return argcount;
3929 }
3930 else if (!strcmp(arg, "--abbrev"))
3931 options->abbrev = DEFAULT_ABBREV;
3932 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3933 options->abbrev = strtoul(arg, NULL, 10);
3934 if (options->abbrev < MINIMUM_ABBREV)
3935 options->abbrev = MINIMUM_ABBREV;
3936 else if (40 < options->abbrev)
3937 options->abbrev = 40;
3938 }
3939 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3940 options->a_prefix = optarg;
3941 return argcount;
3942 }
3943 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3944 options->b_prefix = optarg;
3945 return argcount;
3946 }
3947 else if (!strcmp(arg, "--no-prefix"))
3948 options->a_prefix = options->b_prefix = "";
3949 else if (opt_arg(arg, '\0', "inter-hunk-context",
3950 &options->interhunkcontext))
3951 ;
3952 else if (!strcmp(arg, "-W"))
3953 DIFF_OPT_SET(options, FUNCCONTEXT);
3954 else if (!strcmp(arg, "--function-context"))
3955 DIFF_OPT_SET(options, FUNCCONTEXT);
3956 else if (!strcmp(arg, "--no-function-context"))
3957 DIFF_OPT_CLR(options, FUNCCONTEXT);
3958 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3959 options->file = fopen(optarg, "w");
3960 if (!options->file)
3961 die_errno("Could not open '%s'", optarg);
3962 options->close_file = 1;
3963 return argcount;
3964 } else
3965 return 0;
3966 return 1;
3967 }
3968
3969 int parse_rename_score(const char **cp_p)
3970 {
3971 unsigned long num, scale;
3972 int ch, dot;
3973 const char *cp = *cp_p;
3974
3975 num = 0;
3976 scale = 1;
3977 dot = 0;
3978 for (;;) {
3979 ch = *cp;
3980 if ( !dot && ch == '.' ) {
3981 scale = 1;
3982 dot = 1;
3983 } else if ( ch == '%' ) {
3984 scale = dot ? scale*100 : 100;
3985 cp++; /* % is always at the end */
3986 break;
3987 } else if ( ch >= '0' && ch <= '9' ) {
3988 if ( scale < 100000 ) {
3989 scale *= 10;
3990 num = (num*10) + (ch-'0');
3991 }
3992 } else {
3993 break;
3994 }
3995 cp++;
3996 }
3997 *cp_p = cp;
3998
3999 /* user says num divided by scale and we say internally that
4000 * is MAX_SCORE * num / scale.
4001 */
4002 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4003 }
4004
4005 static int diff_scoreopt_parse(const char *opt)
4006 {
4007 int opt1, opt2, cmd;
4008
4009 if (*opt++ != '-')
4010 return -1;
4011 cmd = *opt++;
4012 if (cmd == '-') {
4013 /* convert the long-form arguments into short-form versions */
4014 if (skip_prefix(opt, "break-rewrites", &opt)) {
4015 if (*opt == 0 || *opt++ == '=')
4016 cmd = 'B';
4017 } else if (skip_prefix(opt, "find-copies", &opt)) {
4018 if (*opt == 0 || *opt++ == '=')
4019 cmd = 'C';
4020 } else if (skip_prefix(opt, "find-renames", &opt)) {
4021 if (*opt == 0 || *opt++ == '=')
4022 cmd = 'M';
4023 }
4024 }
4025 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4026 return -1; /* that is not a -M, -C, or -B option */
4027
4028 opt1 = parse_rename_score(&opt);
4029 if (cmd != 'B')
4030 opt2 = 0;
4031 else {
4032 if (*opt == 0)
4033 opt2 = 0;
4034 else if (*opt != '/')
4035 return -1; /* we expect -B80/99 or -B80 */
4036 else {
4037 opt++;
4038 opt2 = parse_rename_score(&opt);
4039 }
4040 }
4041 if (*opt != 0)
4042 return -1;
4043 return opt1 | (opt2 << 16);
4044 }
4045
4046 struct diff_queue_struct diff_queued_diff;
4047
4048 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4049 {
4050 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4051 queue->queue[queue->nr++] = dp;
4052 }
4053
4054 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4055 struct diff_filespec *one,
4056 struct diff_filespec *two)
4057 {
4058 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4059 dp->one = one;
4060 dp->two = two;
4061 if (queue)
4062 diff_q(queue, dp);
4063 return dp;
4064 }
4065
4066 void diff_free_filepair(struct diff_filepair *p)
4067 {
4068 free_filespec(p->one);
4069 free_filespec(p->two);
4070 free(p);
4071 }
4072
4073 /* This is different from find_unique_abbrev() in that
4074 * it stuffs the result with dots for alignment.
4075 */
4076 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4077 {
4078 int abblen;
4079 const char *abbrev;
4080 if (len == 40)
4081 return sha1_to_hex(sha1);
4082
4083 abbrev = find_unique_abbrev(sha1, len);
4084 abblen = strlen(abbrev);
4085 if (abblen < 37) {
4086 static char hex[41];
4087 if (len < abblen && abblen <= len + 2)
4088 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4089 else
4090 sprintf(hex, "%s...", abbrev);
4091 return hex;
4092 }
4093 return sha1_to_hex(sha1);
4094 }
4095
4096 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4097 {
4098 int line_termination = opt->line_termination;
4099 int inter_name_termination = line_termination ? '\t' : '\0';
4100
4101 fprintf(opt->file, "%s", diff_line_prefix(opt));
4102 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4103 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4104 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4105 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4106 }
4107 if (p->score) {
4108 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4109 inter_name_termination);
4110 } else {
4111 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4112 }
4113
4114 if (p->status == DIFF_STATUS_COPIED ||
4115 p->status == DIFF_STATUS_RENAMED) {
4116 const char *name_a, *name_b;
4117 name_a = p->one->path;
4118 name_b = p->two->path;
4119 strip_prefix(opt->prefix_length, &name_a, &name_b);
4120 write_name_quoted(name_a, opt->file, inter_name_termination);
4121 write_name_quoted(name_b, opt->file, line_termination);
4122 } else {
4123 const char *name_a, *name_b;
4124 name_a = p->one->mode ? p->one->path : p->two->path;
4125 name_b = NULL;
4126 strip_prefix(opt->prefix_length, &name_a, &name_b);
4127 write_name_quoted(name_a, opt->file, line_termination);
4128 }
4129 }
4130
4131 int diff_unmodified_pair(struct diff_filepair *p)
4132 {
4133 /* This function is written stricter than necessary to support
4134 * the currently implemented transformers, but the idea is to
4135 * let transformers to produce diff_filepairs any way they want,
4136 * and filter and clean them up here before producing the output.
4137 */
4138 struct diff_filespec *one = p->one, *two = p->two;
4139
4140 if (DIFF_PAIR_UNMERGED(p))
4141 return 0; /* unmerged is interesting */
4142
4143 /* deletion, addition, mode or type change
4144 * and rename are all interesting.
4145 */
4146 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4147 DIFF_PAIR_MODE_CHANGED(p) ||
4148 strcmp(one->path, two->path))
4149 return 0;
4150
4151 /* both are valid and point at the same path. that is, we are
4152 * dealing with a change.
4153 */
4154 if (one->sha1_valid && two->sha1_valid &&
4155 !hashcmp(one->sha1, two->sha1) &&
4156 !one->dirty_submodule && !two->dirty_submodule)
4157 return 1; /* no change */
4158 if (!one->sha1_valid && !two->sha1_valid)
4159 return 1; /* both look at the same file on the filesystem. */
4160 return 0;
4161 }
4162
4163 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4164 {
4165 if (diff_unmodified_pair(p))
4166 return;
4167
4168 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4169 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4170 return; /* no tree diffs in patch format */
4171
4172 run_diff(p, o);
4173 }
4174
4175 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4176 struct diffstat_t *diffstat)
4177 {
4178 if (diff_unmodified_pair(p))
4179 return;
4180
4181 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4182 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4183 return; /* no useful stat for tree diffs */
4184
4185 run_diffstat(p, o, diffstat);
4186 }
4187
4188 static void diff_flush_checkdiff(struct diff_filepair *p,
4189 struct diff_options *o)
4190 {
4191 if (diff_unmodified_pair(p))
4192 return;
4193
4194 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4195 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4196 return; /* nothing to check in tree diffs */
4197
4198 run_checkdiff(p, o);
4199 }
4200
4201 int diff_queue_is_empty(void)
4202 {
4203 struct diff_queue_struct *q = &diff_queued_diff;
4204 int i;
4205 for (i = 0; i < q->nr; i++)
4206 if (!diff_unmodified_pair(q->queue[i]))
4207 return 0;
4208 return 1;
4209 }
4210
4211 #if DIFF_DEBUG
4212 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4213 {
4214 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4215 x, one ? one : "",
4216 s->path,
4217 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4218 s->mode,
4219 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4220 fprintf(stderr, "queue[%d] %s size %lu\n",
4221 x, one ? one : "",
4222 s->size);
4223 }
4224
4225 void diff_debug_filepair(const struct diff_filepair *p, int i)
4226 {
4227 diff_debug_filespec(p->one, i, "one");
4228 diff_debug_filespec(p->two, i, "two");
4229 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4230 p->score, p->status ? p->status : '?',
4231 p->one->rename_used, p->broken_pair);
4232 }
4233
4234 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4235 {
4236 int i;
4237 if (msg)
4238 fprintf(stderr, "%s\n", msg);
4239 fprintf(stderr, "q->nr = %d\n", q->nr);
4240 for (i = 0; i < q->nr; i++) {
4241 struct diff_filepair *p = q->queue[i];
4242 diff_debug_filepair(p, i);
4243 }
4244 }
4245 #endif
4246
4247 static void diff_resolve_rename_copy(void)
4248 {
4249 int i;
4250 struct diff_filepair *p;
4251 struct diff_queue_struct *q = &diff_queued_diff;
4252
4253 diff_debug_queue("resolve-rename-copy", q);
4254
4255 for (i = 0; i < q->nr; i++) {
4256 p = q->queue[i];
4257 p->status = 0; /* undecided */
4258 if (DIFF_PAIR_UNMERGED(p))
4259 p->status = DIFF_STATUS_UNMERGED;
4260 else if (!DIFF_FILE_VALID(p->one))
4261 p->status = DIFF_STATUS_ADDED;
4262 else if (!DIFF_FILE_VALID(p->two))
4263 p->status = DIFF_STATUS_DELETED;
4264 else if (DIFF_PAIR_TYPE_CHANGED(p))
4265 p->status = DIFF_STATUS_TYPE_CHANGED;
4266
4267 /* from this point on, we are dealing with a pair
4268 * whose both sides are valid and of the same type, i.e.
4269 * either in-place edit or rename/copy edit.
4270 */
4271 else if (DIFF_PAIR_RENAME(p)) {
4272 /*
4273 * A rename might have re-connected a broken
4274 * pair up, causing the pathnames to be the
4275 * same again. If so, that's not a rename at
4276 * all, just a modification..
4277 *
4278 * Otherwise, see if this source was used for
4279 * multiple renames, in which case we decrement
4280 * the count, and call it a copy.
4281 */
4282 if (!strcmp(p->one->path, p->two->path))
4283 p->status = DIFF_STATUS_MODIFIED;
4284 else if (--p->one->rename_used > 0)
4285 p->status = DIFF_STATUS_COPIED;
4286 else
4287 p->status = DIFF_STATUS_RENAMED;
4288 }
4289 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4290 p->one->mode != p->two->mode ||
4291 p->one->dirty_submodule ||
4292 p->two->dirty_submodule ||
4293 is_null_sha1(p->one->sha1))
4294 p->status = DIFF_STATUS_MODIFIED;
4295 else {
4296 /* This is a "no-change" entry and should not
4297 * happen anymore, but prepare for broken callers.
4298 */
4299 error("feeding unmodified %s to diffcore",
4300 p->one->path);
4301 p->status = DIFF_STATUS_UNKNOWN;
4302 }
4303 }
4304 diff_debug_queue("resolve-rename-copy done", q);
4305 }
4306
4307 static int check_pair_status(struct diff_filepair *p)
4308 {
4309 switch (p->status) {
4310 case DIFF_STATUS_UNKNOWN:
4311 return 0;
4312 case 0:
4313 die("internal error in diff-resolve-rename-copy");
4314 default:
4315 return 1;
4316 }
4317 }
4318
4319 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4320 {
4321 int fmt = opt->output_format;
4322
4323 if (fmt & DIFF_FORMAT_CHECKDIFF)
4324 diff_flush_checkdiff(p, opt);
4325 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4326 diff_flush_raw(p, opt);
4327 else if (fmt & DIFF_FORMAT_NAME) {
4328 const char *name_a, *name_b;
4329 name_a = p->two->path;
4330 name_b = NULL;
4331 strip_prefix(opt->prefix_length, &name_a, &name_b);
4332 write_name_quoted(name_a, opt->file, opt->line_termination);
4333 }
4334 }
4335
4336 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4337 {
4338 if (fs->mode)
4339 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4340 else
4341 fprintf(file, " %s ", newdelete);
4342 write_name_quoted(fs->path, file, '\n');
4343 }
4344
4345
4346 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4347 const char *line_prefix)
4348 {
4349 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4350 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4351 p->two->mode, show_name ? ' ' : '\n');
4352 if (show_name) {
4353 write_name_quoted(p->two->path, file, '\n');
4354 }
4355 }
4356 }
4357
4358 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4359 const char *line_prefix)
4360 {
4361 char *names = pprint_rename(p->one->path, p->two->path);
4362
4363 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4364 free(names);
4365 show_mode_change(file, p, 0, line_prefix);
4366 }
4367
4368 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4369 {
4370 FILE *file = opt->file;
4371 const char *line_prefix = diff_line_prefix(opt);
4372
4373 switch(p->status) {
4374 case DIFF_STATUS_DELETED:
4375 fputs(line_prefix, file);
4376 show_file_mode_name(file, "delete", p->one);
4377 break;
4378 case DIFF_STATUS_ADDED:
4379 fputs(line_prefix, file);
4380 show_file_mode_name(file, "create", p->two);
4381 break;
4382 case DIFF_STATUS_COPIED:
4383 fputs(line_prefix, file);
4384 show_rename_copy(file, "copy", p, line_prefix);
4385 break;
4386 case DIFF_STATUS_RENAMED:
4387 fputs(line_prefix, file);
4388 show_rename_copy(file, "rename", p, line_prefix);
4389 break;
4390 default:
4391 if (p->score) {
4392 fprintf(file, "%s rewrite ", line_prefix);
4393 write_name_quoted(p->two->path, file, ' ');
4394 fprintf(file, "(%d%%)\n", similarity_index(p));
4395 }
4396 show_mode_change(file, p, !p->score, line_prefix);
4397 break;
4398 }
4399 }
4400
4401 struct patch_id_t {
4402 git_SHA_CTX *ctx;
4403 int patchlen;
4404 };
4405
4406 static int remove_space(char *line, int len)
4407 {
4408 int i;
4409 char *dst = line;
4410 unsigned char c;
4411
4412 for (i = 0; i < len; i++)
4413 if (!isspace((c = line[i])))
4414 *dst++ = c;
4415
4416 return dst - line;
4417 }
4418
4419 static void patch_id_consume(void *priv, char *line, unsigned long len)
4420 {
4421 struct patch_id_t *data = priv;
4422 int new_len;
4423
4424 /* Ignore line numbers when computing the SHA1 of the patch */
4425 if (starts_with(line, "@@ -"))
4426 return;
4427
4428 new_len = remove_space(line, len);
4429
4430 git_SHA1_Update(data->ctx, line, new_len);
4431 data->patchlen += new_len;
4432 }
4433
4434 /* returns 0 upon success, and writes result into sha1 */
4435 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4436 {
4437 struct diff_queue_struct *q = &diff_queued_diff;
4438 int i;
4439 git_SHA_CTX ctx;
4440 struct patch_id_t data;
4441 char buffer[PATH_MAX * 4 + 20];
4442
4443 git_SHA1_Init(&ctx);
4444 memset(&data, 0, sizeof(struct patch_id_t));
4445 data.ctx = &ctx;
4446
4447 for (i = 0; i < q->nr; i++) {
4448 xpparam_t xpp;
4449 xdemitconf_t xecfg;
4450 mmfile_t mf1, mf2;
4451 struct diff_filepair *p = q->queue[i];
4452 int len1, len2;
4453
4454 memset(&xpp, 0, sizeof(xpp));
4455 memset(&xecfg, 0, sizeof(xecfg));
4456 if (p->status == 0)
4457 return error("internal diff status error");
4458 if (p->status == DIFF_STATUS_UNKNOWN)
4459 continue;
4460 if (diff_unmodified_pair(p))
4461 continue;
4462 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4463 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4464 continue;
4465 if (DIFF_PAIR_UNMERGED(p))
4466 continue;
4467
4468 diff_fill_sha1_info(p->one);
4469 diff_fill_sha1_info(p->two);
4470 if (fill_mmfile(&mf1, p->one) < 0 ||
4471 fill_mmfile(&mf2, p->two) < 0)
4472 return error("unable to read files to diff");
4473
4474 len1 = remove_space(p->one->path, strlen(p->one->path));
4475 len2 = remove_space(p->two->path, strlen(p->two->path));
4476 if (p->one->mode == 0)
4477 len1 = snprintf(buffer, sizeof(buffer),
4478 "diff--gita/%.*sb/%.*s"
4479 "newfilemode%06o"
4480 "---/dev/null"
4481 "+++b/%.*s",
4482 len1, p->one->path,
4483 len2, p->two->path,
4484 p->two->mode,
4485 len2, p->two->path);
4486 else if (p->two->mode == 0)
4487 len1 = snprintf(buffer, sizeof(buffer),
4488 "diff--gita/%.*sb/%.*s"
4489 "deletedfilemode%06o"
4490 "---a/%.*s"
4491 "+++/dev/null",
4492 len1, p->one->path,
4493 len2, p->two->path,
4494 p->one->mode,
4495 len1, p->one->path);
4496 else
4497 len1 = snprintf(buffer, sizeof(buffer),
4498 "diff--gita/%.*sb/%.*s"
4499 "---a/%.*s"
4500 "+++b/%.*s",
4501 len1, p->one->path,
4502 len2, p->two->path,
4503 len1, p->one->path,
4504 len2, p->two->path);
4505 git_SHA1_Update(&ctx, buffer, len1);
4506
4507 if (diff_filespec_is_binary(p->one) ||
4508 diff_filespec_is_binary(p->two)) {
4509 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4510 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4511 continue;
4512 }
4513
4514 xpp.flags = 0;
4515 xecfg.ctxlen = 3;
4516 xecfg.flags = 0;
4517 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4518 &xpp, &xecfg))
4519 return error("unable to generate patch-id diff for %s",
4520 p->one->path);
4521 }
4522
4523 git_SHA1_Final(sha1, &ctx);
4524 return 0;
4525 }
4526
4527 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4528 {
4529 struct diff_queue_struct *q = &diff_queued_diff;
4530 int i;
4531 int result = diff_get_patch_id(options, sha1);
4532
4533 for (i = 0; i < q->nr; i++)
4534 diff_free_filepair(q->queue[i]);
4535
4536 free(q->queue);
4537 DIFF_QUEUE_CLEAR(q);
4538
4539 return result;
4540 }
4541
4542 static int is_summary_empty(const struct diff_queue_struct *q)
4543 {
4544 int i;
4545
4546 for (i = 0; i < q->nr; i++) {
4547 const struct diff_filepair *p = q->queue[i];
4548
4549 switch (p->status) {
4550 case DIFF_STATUS_DELETED:
4551 case DIFF_STATUS_ADDED:
4552 case DIFF_STATUS_COPIED:
4553 case DIFF_STATUS_RENAMED:
4554 return 0;
4555 default:
4556 if (p->score)
4557 return 0;
4558 if (p->one->mode && p->two->mode &&
4559 p->one->mode != p->two->mode)
4560 return 0;
4561 break;
4562 }
4563 }
4564 return 1;
4565 }
4566
4567 static const char rename_limit_warning[] =
4568 "inexact rename detection was skipped due to too many files.";
4569
4570 static const char degrade_cc_to_c_warning[] =
4571 "only found copies from modified paths due to too many files.";
4572
4573 static const char rename_limit_advice[] =
4574 "you may want to set your %s variable to at least "
4575 "%d and retry the command.";
4576
4577 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4578 {
4579 if (degraded_cc)
4580 warning(degrade_cc_to_c_warning);
4581 else if (needed)
4582 warning(rename_limit_warning);
4583 else
4584 return;
4585 if (0 < needed && needed < 32767)
4586 warning(rename_limit_advice, varname, needed);
4587 }
4588
4589 void diff_flush(struct diff_options *options)
4590 {
4591 struct diff_queue_struct *q = &diff_queued_diff;
4592 int i, output_format = options->output_format;
4593 int separator = 0;
4594 int dirstat_by_line = 0;
4595
4596 /*
4597 * Order: raw, stat, summary, patch
4598 * or: name/name-status/checkdiff (other bits clear)
4599 */
4600 if (!q->nr)
4601 goto free_queue;
4602
4603 if (output_format & (DIFF_FORMAT_RAW |
4604 DIFF_FORMAT_NAME |
4605 DIFF_FORMAT_NAME_STATUS |
4606 DIFF_FORMAT_CHECKDIFF)) {
4607 for (i = 0; i < q->nr; i++) {
4608 struct diff_filepair *p = q->queue[i];
4609 if (check_pair_status(p))
4610 flush_one_pair(p, options);
4611 }
4612 separator++;
4613 }
4614
4615 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4616 dirstat_by_line = 1;
4617
4618 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4619 dirstat_by_line) {
4620 struct diffstat_t diffstat;
4621
4622 memset(&diffstat, 0, sizeof(struct diffstat_t));
4623 for (i = 0; i < q->nr; i++) {
4624 struct diff_filepair *p = q->queue[i];
4625 if (check_pair_status(p))
4626 diff_flush_stat(p, options, &diffstat);
4627 }
4628 if (output_format & DIFF_FORMAT_NUMSTAT)
4629 show_numstat(&diffstat, options);
4630 if (output_format & DIFF_FORMAT_DIFFSTAT)
4631 show_stats(&diffstat, options);
4632 if (output_format & DIFF_FORMAT_SHORTSTAT)
4633 show_shortstats(&diffstat, options);
4634 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4635 show_dirstat_by_line(&diffstat, options);
4636 free_diffstat_info(&diffstat);
4637 separator++;
4638 }
4639 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4640 show_dirstat(options);
4641
4642 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4643 for (i = 0; i < q->nr; i++) {
4644 diff_summary(options, q->queue[i]);
4645 }
4646 separator++;
4647 }
4648
4649 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4650 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4651 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4652 /*
4653 * run diff_flush_patch for the exit status. setting
4654 * options->file to /dev/null should be safe, because we
4655 * aren't supposed to produce any output anyway.
4656 */
4657 if (options->close_file)
4658 fclose(options->file);
4659 options->file = fopen("/dev/null", "w");
4660 if (!options->file)
4661 die_errno("Could not open /dev/null");
4662 options->close_file = 1;
4663 for (i = 0; i < q->nr; i++) {
4664 struct diff_filepair *p = q->queue[i];
4665 if (check_pair_status(p))
4666 diff_flush_patch(p, options);
4667 if (options->found_changes)
4668 break;
4669 }
4670 }
4671
4672 if (output_format & DIFF_FORMAT_PATCH) {
4673 if (separator) {
4674 fprintf(options->file, "%s%c",
4675 diff_line_prefix(options),
4676 options->line_termination);
4677 if (options->stat_sep) {
4678 /* attach patch instead of inline */
4679 fputs(options->stat_sep, options->file);
4680 }
4681 }
4682
4683 for (i = 0; i < q->nr; i++) {
4684 struct diff_filepair *p = q->queue[i];
4685 if (check_pair_status(p))
4686 diff_flush_patch(p, options);
4687 }
4688 }
4689
4690 if (output_format & DIFF_FORMAT_CALLBACK)
4691 options->format_callback(q, options, options->format_callback_data);
4692
4693 for (i = 0; i < q->nr; i++)
4694 diff_free_filepair(q->queue[i]);
4695 free_queue:
4696 free(q->queue);
4697 DIFF_QUEUE_CLEAR(q);
4698 if (options->close_file)
4699 fclose(options->file);
4700
4701 /*
4702 * Report the content-level differences with HAS_CHANGES;
4703 * diff_addremove/diff_change does not set the bit when
4704 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4705 */
4706 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4707 if (options->found_changes)
4708 DIFF_OPT_SET(options, HAS_CHANGES);
4709 else
4710 DIFF_OPT_CLR(options, HAS_CHANGES);
4711 }
4712 }
4713
4714 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4715 {
4716 return (((p->status == DIFF_STATUS_MODIFIED) &&
4717 ((p->score &&
4718 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4719 (!p->score &&
4720 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4721 ((p->status != DIFF_STATUS_MODIFIED) &&
4722 filter_bit_tst(p->status, options)));
4723 }
4724
4725 static void diffcore_apply_filter(struct diff_options *options)
4726 {
4727 int i;
4728 struct diff_queue_struct *q = &diff_queued_diff;
4729 struct diff_queue_struct outq;
4730
4731 DIFF_QUEUE_CLEAR(&outq);
4732
4733 if (!options->filter)
4734 return;
4735
4736 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4737 int found;
4738 for (i = found = 0; !found && i < q->nr; i++) {
4739 if (match_filter(options, q->queue[i]))
4740 found++;
4741 }
4742 if (found)
4743 return;
4744
4745 /* otherwise we will clear the whole queue
4746 * by copying the empty outq at the end of this
4747 * function, but first clear the current entries
4748 * in the queue.
4749 */
4750 for (i = 0; i < q->nr; i++)
4751 diff_free_filepair(q->queue[i]);
4752 }
4753 else {
4754 /* Only the matching ones */
4755 for (i = 0; i < q->nr; i++) {
4756 struct diff_filepair *p = q->queue[i];
4757 if (match_filter(options, p))
4758 diff_q(&outq, p);
4759 else
4760 diff_free_filepair(p);
4761 }
4762 }
4763 free(q->queue);
4764 *q = outq;
4765 }
4766
4767 /* Check whether two filespecs with the same mode and size are identical */
4768 static int diff_filespec_is_identical(struct diff_filespec *one,
4769 struct diff_filespec *two)
4770 {
4771 if (S_ISGITLINK(one->mode))
4772 return 0;
4773 if (diff_populate_filespec(one, 0))
4774 return 0;
4775 if (diff_populate_filespec(two, 0))
4776 return 0;
4777 return !memcmp(one->data, two->data, one->size);
4778 }
4779
4780 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4781 {
4782 if (p->done_skip_stat_unmatch)
4783 return p->skip_stat_unmatch_result;
4784
4785 p->done_skip_stat_unmatch = 1;
4786 p->skip_stat_unmatch_result = 0;
4787 /*
4788 * 1. Entries that come from stat info dirtiness
4789 * always have both sides (iow, not create/delete),
4790 * one side of the object name is unknown, with
4791 * the same mode and size. Keep the ones that
4792 * do not match these criteria. They have real
4793 * differences.
4794 *
4795 * 2. At this point, the file is known to be modified,
4796 * with the same mode and size, and the object
4797 * name of one side is unknown. Need to inspect
4798 * the identical contents.
4799 */
4800 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4801 !DIFF_FILE_VALID(p->two) ||
4802 (p->one->sha1_valid && p->two->sha1_valid) ||
4803 (p->one->mode != p->two->mode) ||
4804 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4805 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4806 (p->one->size != p->two->size) ||
4807 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4808 p->skip_stat_unmatch_result = 1;
4809 return p->skip_stat_unmatch_result;
4810 }
4811
4812 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4813 {
4814 int i;
4815 struct diff_queue_struct *q = &diff_queued_diff;
4816 struct diff_queue_struct outq;
4817 DIFF_QUEUE_CLEAR(&outq);
4818
4819 for (i = 0; i < q->nr; i++) {
4820 struct diff_filepair *p = q->queue[i];
4821
4822 if (diff_filespec_check_stat_unmatch(p))
4823 diff_q(&outq, p);
4824 else {
4825 /*
4826 * The caller can subtract 1 from skip_stat_unmatch
4827 * to determine how many paths were dirty only
4828 * due to stat info mismatch.
4829 */
4830 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4831 diffopt->skip_stat_unmatch++;
4832 diff_free_filepair(p);
4833 }
4834 }
4835 free(q->queue);
4836 *q = outq;
4837 }
4838
4839 static int diffnamecmp(const void *a_, const void *b_)
4840 {
4841 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4842 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4843 const char *name_a, *name_b;
4844
4845 name_a = a->one ? a->one->path : a->two->path;
4846 name_b = b->one ? b->one->path : b->two->path;
4847 return strcmp(name_a, name_b);
4848 }
4849
4850 void diffcore_fix_diff_index(struct diff_options *options)
4851 {
4852 struct diff_queue_struct *q = &diff_queued_diff;
4853 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4854 }
4855
4856 void diffcore_std(struct diff_options *options)
4857 {
4858 /* NOTE please keep the following in sync with diff_tree_combined() */
4859 if (options->skip_stat_unmatch)
4860 diffcore_skip_stat_unmatch(options);
4861 if (!options->found_follow) {
4862 /* See try_to_follow_renames() in tree-diff.c */
4863 if (options->break_opt != -1)
4864 diffcore_break(options->break_opt);
4865 if (options->detect_rename)
4866 diffcore_rename(options);
4867 if (options->break_opt != -1)
4868 diffcore_merge_broken();
4869 }
4870 if (options->pickaxe)
4871 diffcore_pickaxe(options);
4872 if (options->orderfile)
4873 diffcore_order(options->orderfile);
4874 if (!options->found_follow)
4875 /* See try_to_follow_renames() in tree-diff.c */
4876 diff_resolve_rename_copy();
4877 diffcore_apply_filter(options);
4878
4879 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4880 DIFF_OPT_SET(options, HAS_CHANGES);
4881 else
4882 DIFF_OPT_CLR(options, HAS_CHANGES);
4883
4884 options->found_follow = 0;
4885 }
4886
4887 int diff_result_code(struct diff_options *opt, int status)
4888 {
4889 int result = 0;
4890
4891 diff_warn_rename_limit("diff.renameLimit",
4892 opt->needed_rename_limit,
4893 opt->degraded_cc_to_c);
4894 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4895 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4896 return status;
4897 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4898 DIFF_OPT_TST(opt, HAS_CHANGES))
4899 result |= 01;
4900 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4901 DIFF_OPT_TST(opt, CHECK_FAILED))
4902 result |= 02;
4903 return result;
4904 }
4905
4906 int diff_can_quit_early(struct diff_options *opt)
4907 {
4908 return (DIFF_OPT_TST(opt, QUICK) &&
4909 !opt->filter &&
4910 DIFF_OPT_TST(opt, HAS_CHANGES));
4911 }
4912
4913 /*
4914 * Shall changes to this submodule be ignored?
4915 *
4916 * Submodule changes can be configured to be ignored separately for each path,
4917 * but that configuration can be overridden from the command line.
4918 */
4919 static int is_submodule_ignored(const char *path, struct diff_options *options)
4920 {
4921 int ignored = 0;
4922 unsigned orig_flags = options->flags;
4923 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4924 set_diffopt_flags_from_submodule_config(options, path);
4925 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4926 ignored = 1;
4927 options->flags = orig_flags;
4928 return ignored;
4929 }
4930
4931 void diff_addremove(struct diff_options *options,
4932 int addremove, unsigned mode,
4933 const unsigned char *sha1,
4934 int sha1_valid,
4935 const char *concatpath, unsigned dirty_submodule)
4936 {
4937 struct diff_filespec *one, *two;
4938
4939 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4940 return;
4941
4942 /* This may look odd, but it is a preparation for
4943 * feeding "there are unchanged files which should
4944 * not produce diffs, but when you are doing copy
4945 * detection you would need them, so here they are"
4946 * entries to the diff-core. They will be prefixed
4947 * with something like '=' or '*' (I haven't decided
4948 * which but should not make any difference).
4949 * Feeding the same new and old to diff_change()
4950 * also has the same effect.
4951 * Before the final output happens, they are pruned after
4952 * merged into rename/copy pairs as appropriate.
4953 */
4954 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4955 addremove = (addremove == '+' ? '-' :
4956 addremove == '-' ? '+' : addremove);
4957
4958 if (options->prefix &&
4959 strncmp(concatpath, options->prefix, options->prefix_length))
4960 return;
4961
4962 one = alloc_filespec(concatpath);
4963 two = alloc_filespec(concatpath);
4964
4965 if (addremove != '+')
4966 fill_filespec(one, sha1, sha1_valid, mode);
4967 if (addremove != '-') {
4968 fill_filespec(two, sha1, sha1_valid, mode);
4969 two->dirty_submodule = dirty_submodule;
4970 }
4971
4972 diff_queue(&diff_queued_diff, one, two);
4973 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4974 DIFF_OPT_SET(options, HAS_CHANGES);
4975 }
4976
4977 void diff_change(struct diff_options *options,
4978 unsigned old_mode, unsigned new_mode,
4979 const unsigned char *old_sha1,
4980 const unsigned char *new_sha1,
4981 int old_sha1_valid, int new_sha1_valid,
4982 const char *concatpath,
4983 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4984 {
4985 struct diff_filespec *one, *two;
4986 struct diff_filepair *p;
4987
4988 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4989 is_submodule_ignored(concatpath, options))
4990 return;
4991
4992 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4993 unsigned tmp;
4994 const unsigned char *tmp_c;
4995 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4996 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4997 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4998 new_sha1_valid = tmp;
4999 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
5000 new_dirty_submodule = tmp;
5001 }
5002
5003 if (options->prefix &&
5004 strncmp(concatpath, options->prefix, options->prefix_length))
5005 return;
5006
5007 one = alloc_filespec(concatpath);
5008 two = alloc_filespec(concatpath);
5009 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5010 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5011 one->dirty_submodule = old_dirty_submodule;
5012 two->dirty_submodule = new_dirty_submodule;
5013 p = diff_queue(&diff_queued_diff, one, two);
5014
5015 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5016 return;
5017
5018 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5019 !diff_filespec_check_stat_unmatch(p))
5020 return;
5021
5022 DIFF_OPT_SET(options, HAS_CHANGES);
5023 }
5024
5025 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5026 {
5027 struct diff_filepair *pair;
5028 struct diff_filespec *one, *two;
5029
5030 if (options->prefix &&
5031 strncmp(path, options->prefix, options->prefix_length))
5032 return NULL;
5033
5034 one = alloc_filespec(path);
5035 two = alloc_filespec(path);
5036 pair = diff_queue(&diff_queued_diff, one, two);
5037 pair->is_unmerged = 1;
5038 return pair;
5039 }
5040
5041 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5042 size_t *outsize)
5043 {
5044 struct diff_tempfile *temp;
5045 const char *argv[3];
5046 const char **arg = argv;
5047 struct child_process child = CHILD_PROCESS_INIT;
5048 struct strbuf buf = STRBUF_INIT;
5049 int err = 0;
5050
5051 temp = prepare_temp_file(spec->path, spec);
5052 *arg++ = pgm;
5053 *arg++ = temp->name;
5054 *arg = NULL;
5055
5056 child.use_shell = 1;
5057 child.argv = argv;
5058 child.out = -1;
5059 if (start_command(&child)) {
5060 remove_tempfile();
5061 return NULL;
5062 }
5063
5064 if (strbuf_read(&buf, child.out, 0) < 0)
5065 err = error("error reading from textconv command '%s'", pgm);
5066 close(child.out);
5067
5068 if (finish_command(&child) || err) {
5069 strbuf_release(&buf);
5070 remove_tempfile();
5071 return NULL;
5072 }
5073 remove_tempfile();
5074
5075 return strbuf_detach(&buf, outsize);
5076 }
5077
5078 size_t fill_textconv(struct userdiff_driver *driver,
5079 struct diff_filespec *df,
5080 char **outbuf)
5081 {
5082 size_t size;
5083
5084 if (!driver || !driver->textconv) {
5085 if (!DIFF_FILE_VALID(df)) {
5086 *outbuf = "";
5087 return 0;
5088 }
5089 if (diff_populate_filespec(df, 0))
5090 die("unable to read files to diff");
5091 *outbuf = df->data;
5092 return df->size;
5093 }
5094
5095 if (driver->textconv_cache && df->sha1_valid) {
5096 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5097 &size);
5098 if (*outbuf)
5099 return size;
5100 }
5101
5102 *outbuf = run_textconv(driver->textconv, df, &size);
5103 if (!*outbuf)
5104 die("unable to read files to diff");
5105
5106 if (driver->textconv_cache && df->sha1_valid) {
5107 /* ignore errors, as we might be in a readonly repository */
5108 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5109 size);
5110 /*
5111 * we could save up changes and flush them all at the end,
5112 * but we would need an extra call after all diffing is done.
5113 * Since generating a cache entry is the slow path anyway,
5114 * this extra overhead probably isn't a big deal.
5115 */
5116 notes_cache_write(driver->textconv_cache);
5117 }
5118
5119 return size;
5120 }
5121
5122 void setup_diff_pager(struct diff_options *opt)
5123 {
5124 /*
5125 * If the user asked for our exit code, then either they want --quiet
5126 * or --exit-code. We should definitely not bother with a pager in the
5127 * former case, as we will generate no output. Since we still properly
5128 * report our exit code even when a pager is run, we _could_ run a
5129 * pager with --exit-code. But since we have not done so historically,
5130 * and because it is easy to find people oneline advising "git diff
5131 * --exit-code" in hooks and other scripts, we do not do so.
5132 */
5133 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5134 check_pager_config("diff") != 0)
5135 setup_pager();
5136 }
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