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cache.h: clarify documentation for git_path, et al
[alt-git.git] / diff.c
blob7deac90532234996088ae847b32ce07f5ba36339
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18 #include "string-list.h"
19 #include "argv-array.h"
20
21 #ifdef NO_FAST_WORKING_DIRECTORY
22 #define FAST_WORKING_DIRECTORY 0
23 #else
24 #define FAST_WORKING_DIRECTORY 1
25 #endif
26
27 static int diff_detect_rename_default;
28 static int diff_rename_limit_default = 400;
29 static int diff_suppress_blank_empty;
30 static int diff_use_color_default = -1;
31 static int diff_context_default = 3;
32 static const char *diff_word_regex_cfg;
33 static const char *external_diff_cmd_cfg;
34 static const char *diff_order_file_cfg;
35 int diff_auto_refresh_index = 1;
36 static int diff_mnemonic_prefix;
37 static int diff_no_prefix;
38 static int diff_stat_graph_width;
39 static int diff_dirstat_permille_default = 30;
40 static struct diff_options default_diff_options;
41 static long diff_algorithm;
42
43 static char diff_colors[][COLOR_MAXLEN] = {
44 GIT_COLOR_RESET,
45 GIT_COLOR_NORMAL, /* CONTEXT */
46 GIT_COLOR_BOLD, /* METAINFO */
47 GIT_COLOR_CYAN, /* FRAGINFO */
48 GIT_COLOR_RED, /* OLD */
49 GIT_COLOR_GREEN, /* NEW */
50 GIT_COLOR_YELLOW, /* COMMIT */
51 GIT_COLOR_BG_RED, /* WHITESPACE */
52 GIT_COLOR_NORMAL, /* FUNCINFO */
53 };
54
55 static int parse_diff_color_slot(const char *var)
56 {
57 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
58 return DIFF_CONTEXT;
59 if (!strcasecmp(var, "meta"))
60 return DIFF_METAINFO;
61 if (!strcasecmp(var, "frag"))
62 return DIFF_FRAGINFO;
63 if (!strcasecmp(var, "old"))
64 return DIFF_FILE_OLD;
65 if (!strcasecmp(var, "new"))
66 return DIFF_FILE_NEW;
67 if (!strcasecmp(var, "commit"))
68 return DIFF_COMMIT;
69 if (!strcasecmp(var, "whitespace"))
70 return DIFF_WHITESPACE;
71 if (!strcasecmp(var, "func"))
72 return DIFF_FUNCINFO;
73 return -1;
74 }
75
76 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
77 struct strbuf *errmsg)
78 {
79 char *params_copy = xstrdup(params_string);
80 struct string_list params = STRING_LIST_INIT_NODUP;
81 int ret = 0;
82 int i;
83
84 if (*params_copy)
85 string_list_split_in_place(&params, params_copy, ',', -1);
86 for (i = 0; i < params.nr; i++) {
87 const char *p = params.items[i].string;
88 if (!strcmp(p, "changes")) {
89 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
90 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
91 } else if (!strcmp(p, "lines")) {
92 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
93 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
94 } else if (!strcmp(p, "files")) {
95 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
96 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
97 } else if (!strcmp(p, "noncumulative")) {
98 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
99 } else if (!strcmp(p, "cumulative")) {
100 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
101 } else if (isdigit(*p)) {
102 char *end;
103 int permille = strtoul(p, &end, 10) * 10;
104 if (*end == '.' && isdigit(*++end)) {
105 /* only use first digit */
106 permille += *end - '0';
107 /* .. and ignore any further digits */
108 while (isdigit(*++end))
109 ; /* nothing */
110 }
111 if (!*end)
112 options->dirstat_permille = permille;
113 else {
114 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
115 p);
116 ret++;
117 }
118 } else {
119 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
120 ret++;
121 }
122
123 }
124 string_list_clear(&params, 0);
125 free(params_copy);
126 return ret;
127 }
128
129 static int parse_submodule_params(struct diff_options *options, const char *value)
130 {
131 if (!strcmp(value, "log"))
132 DIFF_OPT_SET(options, SUBMODULE_LOG);
133 else if (!strcmp(value, "short"))
134 DIFF_OPT_CLR(options, SUBMODULE_LOG);
135 else
136 return -1;
137 return 0;
138 }
139
140 static int git_config_rename(const char *var, const char *value)
141 {
142 if (!value)
143 return DIFF_DETECT_RENAME;
144 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
145 return DIFF_DETECT_COPY;
146 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
147 }
148
149 long parse_algorithm_value(const char *value)
150 {
151 if (!value)
152 return -1;
153 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
154 return 0;
155 else if (!strcasecmp(value, "minimal"))
156 return XDF_NEED_MINIMAL;
157 else if (!strcasecmp(value, "patience"))
158 return XDF_PATIENCE_DIFF;
159 else if (!strcasecmp(value, "histogram"))
160 return XDF_HISTOGRAM_DIFF;
161 return -1;
162 }
163
164 /*
165 * These are to give UI layer defaults.
166 * The core-level commands such as git-diff-files should
167 * never be affected by the setting of diff.renames
168 * the user happens to have in the configuration file.
169 */
170 int git_diff_ui_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
173 diff_use_color_default = git_config_colorbool(var, value);
174 return 0;
175 }
176 if (!strcmp(var, "diff.context")) {
177 diff_context_default = git_config_int(var, value);
178 if (diff_context_default < 0)
179 return -1;
180 return 0;
181 }
182 if (!strcmp(var, "diff.renames")) {
183 diff_detect_rename_default = git_config_rename(var, value);
184 return 0;
185 }
186 if (!strcmp(var, "diff.autorefreshindex")) {
187 diff_auto_refresh_index = git_config_bool(var, value);
188 return 0;
189 }
190 if (!strcmp(var, "diff.mnemonicprefix")) {
191 diff_mnemonic_prefix = git_config_bool(var, value);
192 return 0;
193 }
194 if (!strcmp(var, "diff.noprefix")) {
195 diff_no_prefix = git_config_bool(var, value);
196 return 0;
197 }
198 if (!strcmp(var, "diff.statgraphwidth")) {
199 diff_stat_graph_width = git_config_int(var, value);
200 return 0;
201 }
202 if (!strcmp(var, "diff.external"))
203 return git_config_string(&external_diff_cmd_cfg, var, value);
204 if (!strcmp(var, "diff.wordregex"))
205 return git_config_string(&diff_word_regex_cfg, var, value);
206 if (!strcmp(var, "diff.orderfile"))
207 return git_config_pathname(&diff_order_file_cfg, var, value);
208
209 if (!strcmp(var, "diff.ignoresubmodules"))
210 handle_ignore_submodules_arg(&default_diff_options, value);
211
212 if (!strcmp(var, "diff.submodule")) {
213 if (parse_submodule_params(&default_diff_options, value))
214 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
215 value);
216 return 0;
217 }
218
219 if (!strcmp(var, "diff.algorithm")) {
220 diff_algorithm = parse_algorithm_value(value);
221 if (diff_algorithm < 0)
222 return -1;
223 return 0;
224 }
225
226 if (git_color_config(var, value, cb) < 0)
227 return -1;
228
229 return git_diff_basic_config(var, value, cb);
230 }
231
232 int git_diff_basic_config(const char *var, const char *value, void *cb)
233 {
234 const char *name;
235
236 if (!strcmp(var, "diff.renamelimit")) {
237 diff_rename_limit_default = git_config_int(var, value);
238 return 0;
239 }
240
241 if (userdiff_config(var, value) < 0)
242 return -1;
243
244 if (skip_prefix(var, "diff.color.", &name) ||
245 skip_prefix(var, "color.diff.", &name)) {
246 int slot = parse_diff_color_slot(name);
247 if (slot < 0)
248 return 0;
249 if (!value)
250 return config_error_nonbool(var);
251 return color_parse(value, diff_colors[slot]);
252 }
253
254 /* like GNU diff's --suppress-blank-empty option */
255 if (!strcmp(var, "diff.suppressblankempty") ||
256 /* for backwards compatibility */
257 !strcmp(var, "diff.suppress-blank-empty")) {
258 diff_suppress_blank_empty = git_config_bool(var, value);
259 return 0;
260 }
261
262 if (!strcmp(var, "diff.dirstat")) {
263 struct strbuf errmsg = STRBUF_INIT;
264 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
265 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
266 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
267 errmsg.buf);
268 strbuf_release(&errmsg);
269 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
270 return 0;
271 }
272
273 if (starts_with(var, "submodule."))
274 return parse_submodule_config_option(var, value);
275
276 return git_default_config(var, value, cb);
277 }
278
279 static char *quote_two(const char *one, const char *two)
280 {
281 int need_one = quote_c_style(one, NULL, NULL, 1);
282 int need_two = quote_c_style(two, NULL, NULL, 1);
283 struct strbuf res = STRBUF_INIT;
284
285 if (need_one + need_two) {
286 strbuf_addch(&res, '"');
287 quote_c_style(one, &res, NULL, 1);
288 quote_c_style(two, &res, NULL, 1);
289 strbuf_addch(&res, '"');
290 } else {
291 strbuf_addstr(&res, one);
292 strbuf_addstr(&res, two);
293 }
294 return strbuf_detach(&res, NULL);
295 }
296
297 static const char *external_diff(void)
298 {
299 static const char *external_diff_cmd = NULL;
300 static int done_preparing = 0;
301
302 if (done_preparing)
303 return external_diff_cmd;
304 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
305 if (!external_diff_cmd)
306 external_diff_cmd = external_diff_cmd_cfg;
307 done_preparing = 1;
308 return external_diff_cmd;
309 }
310
311 static struct diff_tempfile {
312 const char *name; /* filename external diff should read from */
313 char hex[41];
314 char mode[10];
315 char tmp_path[PATH_MAX];
316 } diff_temp[2];
317
318 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
319
320 struct emit_callback {
321 int color_diff;
322 unsigned ws_rule;
323 int blank_at_eof_in_preimage;
324 int blank_at_eof_in_postimage;
325 int lno_in_preimage;
326 int lno_in_postimage;
327 sane_truncate_fn truncate;
328 const char **label_path;
329 struct diff_words_data *diff_words;
330 struct diff_options *opt;
331 int *found_changesp;
332 struct strbuf *header;
333 };
334
335 static int count_lines(const char *data, int size)
336 {
337 int count, ch, completely_empty = 1, nl_just_seen = 0;
338 count = 0;
339 while (0 < size--) {
340 ch = *data++;
341 if (ch == '\n') {
342 count++;
343 nl_just_seen = 1;
344 completely_empty = 0;
345 }
346 else {
347 nl_just_seen = 0;
348 completely_empty = 0;
349 }
350 }
351 if (completely_empty)
352 return 0;
353 if (!nl_just_seen)
354 count++; /* no trailing newline */
355 return count;
356 }
357
358 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
359 {
360 if (!DIFF_FILE_VALID(one)) {
361 mf->ptr = (char *)""; /* does not matter */
362 mf->size = 0;
363 return 0;
364 }
365 else if (diff_populate_filespec(one, 0))
366 return -1;
367
368 mf->ptr = one->data;
369 mf->size = one->size;
370 return 0;
371 }
372
373 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
374 static unsigned long diff_filespec_size(struct diff_filespec *one)
375 {
376 if (!DIFF_FILE_VALID(one))
377 return 0;
378 diff_populate_filespec(one, CHECK_SIZE_ONLY);
379 return one->size;
380 }
381
382 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
383 {
384 char *ptr = mf->ptr;
385 long size = mf->size;
386 int cnt = 0;
387
388 if (!size)
389 return cnt;
390 ptr += size - 1; /* pointing at the very end */
391 if (*ptr != '\n')
392 ; /* incomplete line */
393 else
394 ptr--; /* skip the last LF */
395 while (mf->ptr < ptr) {
396 char *prev_eol;
397 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
398 if (*prev_eol == '\n')
399 break;
400 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
401 break;
402 cnt++;
403 ptr = prev_eol - 1;
404 }
405 return cnt;
406 }
407
408 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
409 struct emit_callback *ecbdata)
410 {
411 int l1, l2, at;
412 unsigned ws_rule = ecbdata->ws_rule;
413 l1 = count_trailing_blank(mf1, ws_rule);
414 l2 = count_trailing_blank(mf2, ws_rule);
415 if (l2 <= l1) {
416 ecbdata->blank_at_eof_in_preimage = 0;
417 ecbdata->blank_at_eof_in_postimage = 0;
418 return;
419 }
420 at = count_lines(mf1->ptr, mf1->size);
421 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
422
423 at = count_lines(mf2->ptr, mf2->size);
424 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
425 }
426
427 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
428 int first, const char *line, int len)
429 {
430 int has_trailing_newline, has_trailing_carriage_return;
431 int nofirst;
432 FILE *file = o->file;
433
434 fputs(diff_line_prefix(o), file);
435
436 if (len == 0) {
437 has_trailing_newline = (first == '\n');
438 has_trailing_carriage_return = (!has_trailing_newline &&
439 (first == '\r'));
440 nofirst = has_trailing_newline || has_trailing_carriage_return;
441 } else {
442 has_trailing_newline = (len > 0 && line[len-1] == '\n');
443 if (has_trailing_newline)
444 len--;
445 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
446 if (has_trailing_carriage_return)
447 len--;
448 nofirst = 0;
449 }
450
451 if (len || !nofirst) {
452 fputs(set, file);
453 if (!nofirst)
454 fputc(first, file);
455 fwrite(line, len, 1, file);
456 fputs(reset, file);
457 }
458 if (has_trailing_carriage_return)
459 fputc('\r', file);
460 if (has_trailing_newline)
461 fputc('\n', file);
462 }
463
464 static void emit_line(struct diff_options *o, const char *set, const char *reset,
465 const char *line, int len)
466 {
467 emit_line_0(o, set, reset, line[0], line+1, len-1);
468 }
469
470 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
471 {
472 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
473 ecbdata->blank_at_eof_in_preimage &&
474 ecbdata->blank_at_eof_in_postimage &&
475 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
476 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
477 return 0;
478 return ws_blank_line(line, len, ecbdata->ws_rule);
479 }
480
481 static void emit_line_checked(const char *reset,
482 struct emit_callback *ecbdata,
483 const char *line, int len,
484 enum color_diff color,
485 unsigned ws_error_highlight,
486 char sign)
487 {
488 const char *set = diff_get_color(ecbdata->color_diff, color);
489 const char *ws = NULL;
490
491 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
492 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
493 if (!*ws)
494 ws = NULL;
495 }
496
497 if (!ws)
498 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
499 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
500 /* Blank line at EOF - paint '+' as well */
501 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
502 else {
503 /* Emit just the prefix, then the rest. */
504 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
505 ws_check_emit(line, len, ecbdata->ws_rule,
506 ecbdata->opt->file, set, reset, ws);
507 }
508 }
509
510 static void emit_add_line(const char *reset,
511 struct emit_callback *ecbdata,
512 const char *line, int len)
513 {
514 emit_line_checked(reset, ecbdata, line, len,
515 DIFF_FILE_NEW, WSEH_NEW, '+');
516 }
517
518 static void emit_del_line(const char *reset,
519 struct emit_callback *ecbdata,
520 const char *line, int len)
521 {
522 emit_line_checked(reset, ecbdata, line, len,
523 DIFF_FILE_OLD, WSEH_OLD, '-');
524 }
525
526 static void emit_context_line(const char *reset,
527 struct emit_callback *ecbdata,
528 const char *line, int len)
529 {
530 emit_line_checked(reset, ecbdata, line, len,
531 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
532 }
533
534 static void emit_hunk_header(struct emit_callback *ecbdata,
535 const char *line, int len)
536 {
537 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
538 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
539 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
540 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
541 static const char atat[2] = { '@', '@' };
542 const char *cp, *ep;
543 struct strbuf msgbuf = STRBUF_INIT;
544 int org_len = len;
545 int i = 1;
546
547 /*
548 * As a hunk header must begin with "@@ -<old>, +<new> @@",
549 * it always is at least 10 bytes long.
550 */
551 if (len < 10 ||
552 memcmp(line, atat, 2) ||
553 !(ep = memmem(line + 2, len - 2, atat, 2))) {
554 emit_line(ecbdata->opt, context, reset, line, len);
555 return;
556 }
557 ep += 2; /* skip over @@ */
558
559 /* The hunk header in fraginfo color */
560 strbuf_addstr(&msgbuf, frag);
561 strbuf_add(&msgbuf, line, ep - line);
562 strbuf_addstr(&msgbuf, reset);
563
564 /*
565 * trailing "\r\n"
566 */
567 for ( ; i < 3; i++)
568 if (line[len - i] == '\r' || line[len - i] == '\n')
569 len--;
570
571 /* blank before the func header */
572 for (cp = ep; ep - line < len; ep++)
573 if (*ep != ' ' && *ep != '\t')
574 break;
575 if (ep != cp) {
576 strbuf_addstr(&msgbuf, context);
577 strbuf_add(&msgbuf, cp, ep - cp);
578 strbuf_addstr(&msgbuf, reset);
579 }
580
581 if (ep < line + len) {
582 strbuf_addstr(&msgbuf, func);
583 strbuf_add(&msgbuf, ep, line + len - ep);
584 strbuf_addstr(&msgbuf, reset);
585 }
586
587 strbuf_add(&msgbuf, line + len, org_len - len);
588 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
589 strbuf_release(&msgbuf);
590 }
591
592 static struct diff_tempfile *claim_diff_tempfile(void) {
593 int i;
594 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
595 if (!diff_temp[i].name)
596 return diff_temp + i;
597 die("BUG: diff is failing to clean up its tempfiles");
598 }
599
600 static int remove_tempfile_installed;
601
602 static void remove_tempfile(void)
603 {
604 int i;
605 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
606 if (diff_temp[i].name == diff_temp[i].tmp_path)
607 unlink_or_warn(diff_temp[i].name);
608 diff_temp[i].name = NULL;
609 }
610 }
611
612 static void remove_tempfile_on_signal(int signo)
613 {
614 remove_tempfile();
615 sigchain_pop(signo);
616 raise(signo);
617 }
618
619 static void print_line_count(FILE *file, int count)
620 {
621 switch (count) {
622 case 0:
623 fprintf(file, "0,0");
624 break;
625 case 1:
626 fprintf(file, "1");
627 break;
628 default:
629 fprintf(file, "1,%d", count);
630 break;
631 }
632 }
633
634 static void emit_rewrite_lines(struct emit_callback *ecb,
635 int prefix, const char *data, int size)
636 {
637 const char *endp = NULL;
638 static const char *nneof = " No newline at end of file\n";
639 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
640
641 while (0 < size) {
642 int len;
643
644 endp = memchr(data, '\n', size);
645 len = endp ? (endp - data + 1) : size;
646 if (prefix != '+') {
647 ecb->lno_in_preimage++;
648 emit_del_line(reset, ecb, data, len);
649 } else {
650 ecb->lno_in_postimage++;
651 emit_add_line(reset, ecb, data, len);
652 }
653 size -= len;
654 data += len;
655 }
656 if (!endp) {
657 const char *context = diff_get_color(ecb->color_diff,
658 DIFF_CONTEXT);
659 putc('\n', ecb->opt->file);
660 emit_line_0(ecb->opt, context, reset, '\\',
661 nneof, strlen(nneof));
662 }
663 }
664
665 static void emit_rewrite_diff(const char *name_a,
666 const char *name_b,
667 struct diff_filespec *one,
668 struct diff_filespec *two,
669 struct userdiff_driver *textconv_one,
670 struct userdiff_driver *textconv_two,
671 struct diff_options *o)
672 {
673 int lc_a, lc_b;
674 const char *name_a_tab, *name_b_tab;
675 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
676 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
677 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
678 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
679 const char *a_prefix, *b_prefix;
680 char *data_one, *data_two;
681 size_t size_one, size_two;
682 struct emit_callback ecbdata;
683 const char *line_prefix = diff_line_prefix(o);
684
685 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
686 a_prefix = o->b_prefix;
687 b_prefix = o->a_prefix;
688 } else {
689 a_prefix = o->a_prefix;
690 b_prefix = o->b_prefix;
691 }
692
693 name_a += (*name_a == '/');
694 name_b += (*name_b == '/');
695 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
696 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
697
698 strbuf_reset(&a_name);
699 strbuf_reset(&b_name);
700 quote_two_c_style(&a_name, a_prefix, name_a, 0);
701 quote_two_c_style(&b_name, b_prefix, name_b, 0);
702
703 size_one = fill_textconv(textconv_one, one, &data_one);
704 size_two = fill_textconv(textconv_two, two, &data_two);
705
706 memset(&ecbdata, 0, sizeof(ecbdata));
707 ecbdata.color_diff = want_color(o->use_color);
708 ecbdata.found_changesp = &o->found_changes;
709 ecbdata.ws_rule = whitespace_rule(name_b);
710 ecbdata.opt = o;
711 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
712 mmfile_t mf1, mf2;
713 mf1.ptr = (char *)data_one;
714 mf2.ptr = (char *)data_two;
715 mf1.size = size_one;
716 mf2.size = size_two;
717 check_blank_at_eof(&mf1, &mf2, &ecbdata);
718 }
719 ecbdata.lno_in_preimage = 1;
720 ecbdata.lno_in_postimage = 1;
721
722 lc_a = count_lines(data_one, size_one);
723 lc_b = count_lines(data_two, size_two);
724 fprintf(o->file,
725 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
726 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
727 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
728 line_prefix, fraginfo);
729 if (!o->irreversible_delete)
730 print_line_count(o->file, lc_a);
731 else
732 fprintf(o->file, "?,?");
733 fprintf(o->file, " +");
734 print_line_count(o->file, lc_b);
735 fprintf(o->file, " @@%s\n", reset);
736 if (lc_a && !o->irreversible_delete)
737 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
738 if (lc_b)
739 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
740 if (textconv_one)
741 free((char *)data_one);
742 if (textconv_two)
743 free((char *)data_two);
744 }
745
746 struct diff_words_buffer {
747 mmfile_t text;
748 long alloc;
749 struct diff_words_orig {
750 const char *begin, *end;
751 } *orig;
752 int orig_nr, orig_alloc;
753 };
754
755 static void diff_words_append(char *line, unsigned long len,
756 struct diff_words_buffer *buffer)
757 {
758 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
759 line++;
760 len--;
761 memcpy(buffer->text.ptr + buffer->text.size, line, len);
762 buffer->text.size += len;
763 buffer->text.ptr[buffer->text.size] = '\0';
764 }
765
766 struct diff_words_style_elem {
767 const char *prefix;
768 const char *suffix;
769 const char *color; /* NULL; filled in by the setup code if
770 * color is enabled */
771 };
772
773 struct diff_words_style {
774 enum diff_words_type type;
775 struct diff_words_style_elem new, old, ctx;
776 const char *newline;
777 };
778
779 static struct diff_words_style diff_words_styles[] = {
780 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
781 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
782 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
783 };
784
785 struct diff_words_data {
786 struct diff_words_buffer minus, plus;
787 const char *current_plus;
788 int last_minus;
789 struct diff_options *opt;
790 regex_t *word_regex;
791 enum diff_words_type type;
792 struct diff_words_style *style;
793 };
794
795 static int fn_out_diff_words_write_helper(FILE *fp,
796 struct diff_words_style_elem *st_el,
797 const char *newline,
798 size_t count, const char *buf,
799 const char *line_prefix)
800 {
801 int print = 0;
802
803 while (count) {
804 char *p = memchr(buf, '\n', count);
805 if (print)
806 fputs(line_prefix, fp);
807 if (p != buf) {
808 if (st_el->color && fputs(st_el->color, fp) < 0)
809 return -1;
810 if (fputs(st_el->prefix, fp) < 0 ||
811 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
812 fputs(st_el->suffix, fp) < 0)
813 return -1;
814 if (st_el->color && *st_el->color
815 && fputs(GIT_COLOR_RESET, fp) < 0)
816 return -1;
817 }
818 if (!p)
819 return 0;
820 if (fputs(newline, fp) < 0)
821 return -1;
822 count -= p + 1 - buf;
823 buf = p + 1;
824 print = 1;
825 }
826 return 0;
827 }
828
829 /*
830 * '--color-words' algorithm can be described as:
831 *
832 * 1. collect a the minus/plus lines of a diff hunk, divided into
833 * minus-lines and plus-lines;
834 *
835 * 2. break both minus-lines and plus-lines into words and
836 * place them into two mmfile_t with one word for each line;
837 *
838 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
839 *
840 * And for the common parts of the both file, we output the plus side text.
841 * diff_words->current_plus is used to trace the current position of the plus file
842 * which printed. diff_words->last_minus is used to trace the last minus word
843 * printed.
844 *
845 * For '--graph' to work with '--color-words', we need to output the graph prefix
846 * on each line of color words output. Generally, there are two conditions on
847 * which we should output the prefix.
848 *
849 * 1. diff_words->last_minus == 0 &&
850 * diff_words->current_plus == diff_words->plus.text.ptr
851 *
852 * that is: the plus text must start as a new line, and if there is no minus
853 * word printed, a graph prefix must be printed.
854 *
855 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
856 * *(diff_words->current_plus - 1) == '\n'
857 *
858 * that is: a graph prefix must be printed following a '\n'
859 */
860 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
861 {
862 if ((diff_words->last_minus == 0 &&
863 diff_words->current_plus == diff_words->plus.text.ptr) ||
864 (diff_words->current_plus > diff_words->plus.text.ptr &&
865 *(diff_words->current_plus - 1) == '\n')) {
866 return 1;
867 } else {
868 return 0;
869 }
870 }
871
872 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
873 {
874 struct diff_words_data *diff_words = priv;
875 struct diff_words_style *style = diff_words->style;
876 int minus_first, minus_len, plus_first, plus_len;
877 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
878 struct diff_options *opt = diff_words->opt;
879 const char *line_prefix;
880
881 if (line[0] != '@' || parse_hunk_header(line, len,
882 &minus_first, &minus_len, &plus_first, &plus_len))
883 return;
884
885 assert(opt);
886 line_prefix = diff_line_prefix(opt);
887
888 /* POSIX requires that first be decremented by one if len == 0... */
889 if (minus_len) {
890 minus_begin = diff_words->minus.orig[minus_first].begin;
891 minus_end =
892 diff_words->minus.orig[minus_first + minus_len - 1].end;
893 } else
894 minus_begin = minus_end =
895 diff_words->minus.orig[minus_first].end;
896
897 if (plus_len) {
898 plus_begin = diff_words->plus.orig[plus_first].begin;
899 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
900 } else
901 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
902
903 if (color_words_output_graph_prefix(diff_words)) {
904 fputs(line_prefix, diff_words->opt->file);
905 }
906 if (diff_words->current_plus != plus_begin) {
907 fn_out_diff_words_write_helper(diff_words->opt->file,
908 &style->ctx, style->newline,
909 plus_begin - diff_words->current_plus,
910 diff_words->current_plus, line_prefix);
911 if (*(plus_begin - 1) == '\n')
912 fputs(line_prefix, diff_words->opt->file);
913 }
914 if (minus_begin != minus_end) {
915 fn_out_diff_words_write_helper(diff_words->opt->file,
916 &style->old, style->newline,
917 minus_end - minus_begin, minus_begin,
918 line_prefix);
919 }
920 if (plus_begin != plus_end) {
921 fn_out_diff_words_write_helper(diff_words->opt->file,
922 &style->new, style->newline,
923 plus_end - plus_begin, plus_begin,
924 line_prefix);
925 }
926
927 diff_words->current_plus = plus_end;
928 diff_words->last_minus = minus_first;
929 }
930
931 /* This function starts looking at *begin, and returns 0 iff a word was found. */
932 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
933 int *begin, int *end)
934 {
935 if (word_regex && *begin < buffer->size) {
936 regmatch_t match[1];
937 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
938 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
939 '\n', match[0].rm_eo - match[0].rm_so);
940 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
941 *begin += match[0].rm_so;
942 return *begin >= *end;
943 }
944 return -1;
945 }
946
947 /* find the next word */
948 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
949 (*begin)++;
950 if (*begin >= buffer->size)
951 return -1;
952
953 /* find the end of the word */
954 *end = *begin + 1;
955 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
956 (*end)++;
957
958 return 0;
959 }
960
961 /*
962 * This function splits the words in buffer->text, stores the list with
963 * newline separator into out, and saves the offsets of the original words
964 * in buffer->orig.
965 */
966 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
967 regex_t *word_regex)
968 {
969 int i, j;
970 long alloc = 0;
971
972 out->size = 0;
973 out->ptr = NULL;
974
975 /* fake an empty "0th" word */
976 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
977 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
978 buffer->orig_nr = 1;
979
980 for (i = 0; i < buffer->text.size; i++) {
981 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
982 return;
983
984 /* store original boundaries */
985 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
986 buffer->orig_alloc);
987 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
988 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
989 buffer->orig_nr++;
990
991 /* store one word */
992 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
993 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
994 out->ptr[out->size + j - i] = '\n';
995 out->size += j - i + 1;
996
997 i = j - 1;
998 }
999 }
1000
1001 /* this executes the word diff on the accumulated buffers */
1002 static void diff_words_show(struct diff_words_data *diff_words)
1003 {
1004 xpparam_t xpp;
1005 xdemitconf_t xecfg;
1006 mmfile_t minus, plus;
1007 struct diff_words_style *style = diff_words->style;
1008
1009 struct diff_options *opt = diff_words->opt;
1010 const char *line_prefix;
1011
1012 assert(opt);
1013 line_prefix = diff_line_prefix(opt);
1014
1015 /* special case: only removal */
1016 if (!diff_words->plus.text.size) {
1017 fputs(line_prefix, diff_words->opt->file);
1018 fn_out_diff_words_write_helper(diff_words->opt->file,
1019 &style->old, style->newline,
1020 diff_words->minus.text.size,
1021 diff_words->minus.text.ptr, line_prefix);
1022 diff_words->minus.text.size = 0;
1023 return;
1024 }
1025
1026 diff_words->current_plus = diff_words->plus.text.ptr;
1027 diff_words->last_minus = 0;
1028
1029 memset(&xpp, 0, sizeof(xpp));
1030 memset(&xecfg, 0, sizeof(xecfg));
1031 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1032 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1033 xpp.flags = 0;
1034 /* as only the hunk header will be parsed, we need a 0-context */
1035 xecfg.ctxlen = 0;
1036 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1037 &xpp, &xecfg);
1038 free(minus.ptr);
1039 free(plus.ptr);
1040 if (diff_words->current_plus != diff_words->plus.text.ptr +
1041 diff_words->plus.text.size) {
1042 if (color_words_output_graph_prefix(diff_words))
1043 fputs(line_prefix, diff_words->opt->file);
1044 fn_out_diff_words_write_helper(diff_words->opt->file,
1045 &style->ctx, style->newline,
1046 diff_words->plus.text.ptr + diff_words->plus.text.size
1047 - diff_words->current_plus, diff_words->current_plus,
1048 line_prefix);
1049 }
1050 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1051 }
1052
1053 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1054 static void diff_words_flush(struct emit_callback *ecbdata)
1055 {
1056 if (ecbdata->diff_words->minus.text.size ||
1057 ecbdata->diff_words->plus.text.size)
1058 diff_words_show(ecbdata->diff_words);
1059 }
1060
1061 static void diff_filespec_load_driver(struct diff_filespec *one)
1062 {
1063 /* Use already-loaded driver */
1064 if (one->driver)
1065 return;
1066
1067 if (S_ISREG(one->mode))
1068 one->driver = userdiff_find_by_path(one->path);
1069
1070 /* Fallback to default settings */
1071 if (!one->driver)
1072 one->driver = userdiff_find_by_name("default");
1073 }
1074
1075 static const char *userdiff_word_regex(struct diff_filespec *one)
1076 {
1077 diff_filespec_load_driver(one);
1078 return one->driver->word_regex;
1079 }
1080
1081 static void init_diff_words_data(struct emit_callback *ecbdata,
1082 struct diff_options *orig_opts,
1083 struct diff_filespec *one,
1084 struct diff_filespec *two)
1085 {
1086 int i;
1087 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1088 memcpy(o, orig_opts, sizeof(struct diff_options));
1089
1090 ecbdata->diff_words =
1091 xcalloc(1, sizeof(struct diff_words_data));
1092 ecbdata->diff_words->type = o->word_diff;
1093 ecbdata->diff_words->opt = o;
1094 if (!o->word_regex)
1095 o->word_regex = userdiff_word_regex(one);
1096 if (!o->word_regex)
1097 o->word_regex = userdiff_word_regex(two);
1098 if (!o->word_regex)
1099 o->word_regex = diff_word_regex_cfg;
1100 if (o->word_regex) {
1101 ecbdata->diff_words->word_regex = (regex_t *)
1102 xmalloc(sizeof(regex_t));
1103 if (regcomp(ecbdata->diff_words->word_regex,
1104 o->word_regex,
1105 REG_EXTENDED | REG_NEWLINE))
1106 die ("Invalid regular expression: %s",
1107 o->word_regex);
1108 }
1109 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1110 if (o->word_diff == diff_words_styles[i].type) {
1111 ecbdata->diff_words->style =
1112 &diff_words_styles[i];
1113 break;
1114 }
1115 }
1116 if (want_color(o->use_color)) {
1117 struct diff_words_style *st = ecbdata->diff_words->style;
1118 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1119 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1120 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1121 }
1122 }
1123
1124 static void free_diff_words_data(struct emit_callback *ecbdata)
1125 {
1126 if (ecbdata->diff_words) {
1127 diff_words_flush(ecbdata);
1128 free (ecbdata->diff_words->opt);
1129 free (ecbdata->diff_words->minus.text.ptr);
1130 free (ecbdata->diff_words->minus.orig);
1131 free (ecbdata->diff_words->plus.text.ptr);
1132 free (ecbdata->diff_words->plus.orig);
1133 if (ecbdata->diff_words->word_regex) {
1134 regfree(ecbdata->diff_words->word_regex);
1135 free(ecbdata->diff_words->word_regex);
1136 }
1137 free(ecbdata->diff_words);
1138 ecbdata->diff_words = NULL;
1139 }
1140 }
1141
1142 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1143 {
1144 if (want_color(diff_use_color))
1145 return diff_colors[ix];
1146 return "";
1147 }
1148
1149 const char *diff_line_prefix(struct diff_options *opt)
1150 {
1151 struct strbuf *msgbuf;
1152 if (!opt->output_prefix)
1153 return "";
1154
1155 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1156 return msgbuf->buf;
1157 }
1158
1159 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1160 {
1161 const char *cp;
1162 unsigned long allot;
1163 size_t l = len;
1164
1165 if (ecb->truncate)
1166 return ecb->truncate(line, len);
1167 cp = line;
1168 allot = l;
1169 while (0 < l) {
1170 (void) utf8_width(&cp, &l);
1171 if (!cp)
1172 break; /* truncated in the middle? */
1173 }
1174 return allot - l;
1175 }
1176
1177 static void find_lno(const char *line, struct emit_callback *ecbdata)
1178 {
1179 const char *p;
1180 ecbdata->lno_in_preimage = 0;
1181 ecbdata->lno_in_postimage = 0;
1182 p = strchr(line, '-');
1183 if (!p)
1184 return; /* cannot happen */
1185 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1186 p = strchr(p, '+');
1187 if (!p)
1188 return; /* cannot happen */
1189 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1190 }
1191
1192 static void fn_out_consume(void *priv, char *line, unsigned long len)
1193 {
1194 struct emit_callback *ecbdata = priv;
1195 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1196 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1197 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1198 struct diff_options *o = ecbdata->opt;
1199 const char *line_prefix = diff_line_prefix(o);
1200
1201 if (ecbdata->header) {
1202 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1203 strbuf_reset(ecbdata->header);
1204 ecbdata->header = NULL;
1205 }
1206 *(ecbdata->found_changesp) = 1;
1207
1208 if (ecbdata->label_path[0]) {
1209 const char *name_a_tab, *name_b_tab;
1210
1211 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1212 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1213
1214 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1215 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1216 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1217 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1218 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1219 }
1220
1221 if (diff_suppress_blank_empty
1222 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1223 line[0] = '\n';
1224 len = 1;
1225 }
1226
1227 if (line[0] == '@') {
1228 if (ecbdata->diff_words)
1229 diff_words_flush(ecbdata);
1230 len = sane_truncate_line(ecbdata, line, len);
1231 find_lno(line, ecbdata);
1232 emit_hunk_header(ecbdata, line, len);
1233 if (line[len-1] != '\n')
1234 putc('\n', ecbdata->opt->file);
1235 return;
1236 }
1237
1238 if (len < 1) {
1239 emit_line(ecbdata->opt, reset, reset, line, len);
1240 if (ecbdata->diff_words
1241 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1242 fputs("~\n", ecbdata->opt->file);
1243 return;
1244 }
1245
1246 if (ecbdata->diff_words) {
1247 if (line[0] == '-') {
1248 diff_words_append(line, len,
1249 &ecbdata->diff_words->minus);
1250 return;
1251 } else if (line[0] == '+') {
1252 diff_words_append(line, len,
1253 &ecbdata->diff_words->plus);
1254 return;
1255 } else if (starts_with(line, "\\ ")) {
1256 /*
1257 * Eat the "no newline at eof" marker as if we
1258 * saw a "+" or "-" line with nothing on it,
1259 * and return without diff_words_flush() to
1260 * defer processing. If this is the end of
1261 * preimage, more "+" lines may come after it.
1262 */
1263 return;
1264 }
1265 diff_words_flush(ecbdata);
1266 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1267 emit_line(ecbdata->opt, context, reset, line, len);
1268 fputs("~\n", ecbdata->opt->file);
1269 } else {
1270 /*
1271 * Skip the prefix character, if any. With
1272 * diff_suppress_blank_empty, there may be
1273 * none.
1274 */
1275 if (line[0] != '\n') {
1276 line++;
1277 len--;
1278 }
1279 emit_line(ecbdata->opt, context, reset, line, len);
1280 }
1281 return;
1282 }
1283
1284 switch (line[0]) {
1285 case '+':
1286 ecbdata->lno_in_postimage++;
1287 emit_add_line(reset, ecbdata, line + 1, len - 1);
1288 break;
1289 case '-':
1290 ecbdata->lno_in_preimage++;
1291 emit_del_line(reset, ecbdata, line + 1, len - 1);
1292 break;
1293 case ' ':
1294 ecbdata->lno_in_postimage++;
1295 ecbdata->lno_in_preimage++;
1296 emit_context_line(reset, ecbdata, line + 1, len - 1);
1297 break;
1298 default:
1299 /* incomplete line at the end */
1300 ecbdata->lno_in_preimage++;
1301 emit_line(ecbdata->opt,
1302 diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1303 reset, line, len);
1304 break;
1305 }
1306 }
1307
1308 static char *pprint_rename(const char *a, const char *b)
1309 {
1310 const char *old = a;
1311 const char *new = b;
1312 struct strbuf name = STRBUF_INIT;
1313 int pfx_length, sfx_length;
1314 int pfx_adjust_for_slash;
1315 int len_a = strlen(a);
1316 int len_b = strlen(b);
1317 int a_midlen, b_midlen;
1318 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1319 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1320
1321 if (qlen_a || qlen_b) {
1322 quote_c_style(a, &name, NULL, 0);
1323 strbuf_addstr(&name, " => ");
1324 quote_c_style(b, &name, NULL, 0);
1325 return strbuf_detach(&name, NULL);
1326 }
1327
1328 /* Find common prefix */
1329 pfx_length = 0;
1330 while (*old && *new && *old == *new) {
1331 if (*old == '/')
1332 pfx_length = old - a + 1;
1333 old++;
1334 new++;
1335 }
1336
1337 /* Find common suffix */
1338 old = a + len_a;
1339 new = b + len_b;
1340 sfx_length = 0;
1341 /*
1342 * If there is a common prefix, it must end in a slash. In
1343 * that case we let this loop run 1 into the prefix to see the
1344 * same slash.
1345 *
1346 * If there is no common prefix, we cannot do this as it would
1347 * underrun the input strings.
1348 */
1349 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1350 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1351 b + pfx_length - pfx_adjust_for_slash <= new &&
1352 *old == *new) {
1353 if (*old == '/')
1354 sfx_length = len_a - (old - a);
1355 old--;
1356 new--;
1357 }
1358
1359 /*
1360 * pfx{mid-a => mid-b}sfx
1361 * {pfx-a => pfx-b}sfx
1362 * pfx{sfx-a => sfx-b}
1363 * name-a => name-b
1364 */
1365 a_midlen = len_a - pfx_length - sfx_length;
1366 b_midlen = len_b - pfx_length - sfx_length;
1367 if (a_midlen < 0)
1368 a_midlen = 0;
1369 if (b_midlen < 0)
1370 b_midlen = 0;
1371
1372 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1373 if (pfx_length + sfx_length) {
1374 strbuf_add(&name, a, pfx_length);
1375 strbuf_addch(&name, '{');
1376 }
1377 strbuf_add(&name, a + pfx_length, a_midlen);
1378 strbuf_addstr(&name, " => ");
1379 strbuf_add(&name, b + pfx_length, b_midlen);
1380 if (pfx_length + sfx_length) {
1381 strbuf_addch(&name, '}');
1382 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1383 }
1384 return strbuf_detach(&name, NULL);
1385 }
1386
1387 struct diffstat_t {
1388 int nr;
1389 int alloc;
1390 struct diffstat_file {
1391 char *from_name;
1392 char *name;
1393 char *print_name;
1394 unsigned is_unmerged:1;
1395 unsigned is_binary:1;
1396 unsigned is_renamed:1;
1397 unsigned is_interesting:1;
1398 uintmax_t added, deleted;
1399 } **files;
1400 };
1401
1402 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1403 const char *name_a,
1404 const char *name_b)
1405 {
1406 struct diffstat_file *x;
1407 x = xcalloc(1, sizeof(*x));
1408 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1409 diffstat->files[diffstat->nr++] = x;
1410 if (name_b) {
1411 x->from_name = xstrdup(name_a);
1412 x->name = xstrdup(name_b);
1413 x->is_renamed = 1;
1414 }
1415 else {
1416 x->from_name = NULL;
1417 x->name = xstrdup(name_a);
1418 }
1419 return x;
1420 }
1421
1422 static void diffstat_consume(void *priv, char *line, unsigned long len)
1423 {
1424 struct diffstat_t *diffstat = priv;
1425 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1426
1427 if (line[0] == '+')
1428 x->added++;
1429 else if (line[0] == '-')
1430 x->deleted++;
1431 }
1432
1433 const char mime_boundary_leader[] = "------------";
1434
1435 static int scale_linear(int it, int width, int max_change)
1436 {
1437 if (!it)
1438 return 0;
1439 /*
1440 * make sure that at least one '-' or '+' is printed if
1441 * there is any change to this path. The easiest way is to
1442 * scale linearly as if the alloted width is one column shorter
1443 * than it is, and then add 1 to the result.
1444 */
1445 return 1 + (it * (width - 1) / max_change);
1446 }
1447
1448 static void show_name(FILE *file,
1449 const char *prefix, const char *name, int len)
1450 {
1451 fprintf(file, " %s%-*s |", prefix, len, name);
1452 }
1453
1454 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1455 {
1456 if (cnt <= 0)
1457 return;
1458 fprintf(file, "%s", set);
1459 while (cnt--)
1460 putc(ch, file);
1461 fprintf(file, "%s", reset);
1462 }
1463
1464 static void fill_print_name(struct diffstat_file *file)
1465 {
1466 char *pname;
1467
1468 if (file->print_name)
1469 return;
1470
1471 if (!file->is_renamed) {
1472 struct strbuf buf = STRBUF_INIT;
1473 if (quote_c_style(file->name, &buf, NULL, 0)) {
1474 pname = strbuf_detach(&buf, NULL);
1475 } else {
1476 pname = file->name;
1477 strbuf_release(&buf);
1478 }
1479 } else {
1480 pname = pprint_rename(file->from_name, file->name);
1481 }
1482 file->print_name = pname;
1483 }
1484
1485 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1486 {
1487 struct strbuf sb = STRBUF_INIT;
1488 int ret;
1489
1490 if (!files) {
1491 assert(insertions == 0 && deletions == 0);
1492 return fprintf(fp, "%s\n", " 0 files changed");
1493 }
1494
1495 strbuf_addf(&sb,
1496 (files == 1) ? " %d file changed" : " %d files changed",
1497 files);
1498
1499 /*
1500 * For binary diff, the caller may want to print "x files
1501 * changed" with insertions == 0 && deletions == 0.
1502 *
1503 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1504 * is probably less confusing (i.e skip over "2 files changed
1505 * but nothing about added/removed lines? Is this a bug in Git?").
1506 */
1507 if (insertions || deletions == 0) {
1508 strbuf_addf(&sb,
1509 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1510 insertions);
1511 }
1512
1513 if (deletions || insertions == 0) {
1514 strbuf_addf(&sb,
1515 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1516 deletions);
1517 }
1518 strbuf_addch(&sb, '\n');
1519 ret = fputs(sb.buf, fp);
1520 strbuf_release(&sb);
1521 return ret;
1522 }
1523
1524 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1525 {
1526 int i, len, add, del, adds = 0, dels = 0;
1527 uintmax_t max_change = 0, max_len = 0;
1528 int total_files = data->nr, count;
1529 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1530 const char *reset, *add_c, *del_c;
1531 const char *line_prefix = "";
1532 int extra_shown = 0;
1533
1534 if (data->nr == 0)
1535 return;
1536
1537 line_prefix = diff_line_prefix(options);
1538 count = options->stat_count ? options->stat_count : data->nr;
1539
1540 reset = diff_get_color_opt(options, DIFF_RESET);
1541 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1542 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1543
1544 /*
1545 * Find the longest filename and max number of changes
1546 */
1547 for (i = 0; (i < count) && (i < data->nr); i++) {
1548 struct diffstat_file *file = data->files[i];
1549 uintmax_t change = file->added + file->deleted;
1550
1551 if (!file->is_interesting && (change == 0)) {
1552 count++; /* not shown == room for one more */
1553 continue;
1554 }
1555 fill_print_name(file);
1556 len = strlen(file->print_name);
1557 if (max_len < len)
1558 max_len = len;
1559
1560 if (file->is_unmerged) {
1561 /* "Unmerged" is 8 characters */
1562 bin_width = bin_width < 8 ? 8 : bin_width;
1563 continue;
1564 }
1565 if (file->is_binary) {
1566 /* "Bin XXX -> YYY bytes" */
1567 int w = 14 + decimal_width(file->added)
1568 + decimal_width(file->deleted);
1569 bin_width = bin_width < w ? w : bin_width;
1570 /* Display change counts aligned with "Bin" */
1571 number_width = 3;
1572 continue;
1573 }
1574
1575 if (max_change < change)
1576 max_change = change;
1577 }
1578 count = i; /* where we can stop scanning in data->files[] */
1579
1580 /*
1581 * We have width = stat_width or term_columns() columns total.
1582 * We want a maximum of min(max_len, stat_name_width) for the name part.
1583 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1584 * We also need 1 for " " and 4 + decimal_width(max_change)
1585 * for " | NNNN " and one the empty column at the end, altogether
1586 * 6 + decimal_width(max_change).
1587 *
1588 * If there's not enough space, we will use the smaller of
1589 * stat_name_width (if set) and 5/8*width for the filename,
1590 * and the rest for constant elements + graph part, but no more
1591 * than stat_graph_width for the graph part.
1592 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1593 * for the standard terminal size).
1594 *
1595 * In other words: stat_width limits the maximum width, and
1596 * stat_name_width fixes the maximum width of the filename,
1597 * and is also used to divide available columns if there
1598 * aren't enough.
1599 *
1600 * Binary files are displayed with "Bin XXX -> YYY bytes"
1601 * instead of the change count and graph. This part is treated
1602 * similarly to the graph part, except that it is not
1603 * "scaled". If total width is too small to accommodate the
1604 * guaranteed minimum width of the filename part and the
1605 * separators and this message, this message will "overflow"
1606 * making the line longer than the maximum width.
1607 */
1608
1609 if (options->stat_width == -1)
1610 width = term_columns() - options->output_prefix_length;
1611 else
1612 width = options->stat_width ? options->stat_width : 80;
1613 number_width = decimal_width(max_change) > number_width ?
1614 decimal_width(max_change) : number_width;
1615
1616 if (options->stat_graph_width == -1)
1617 options->stat_graph_width = diff_stat_graph_width;
1618
1619 /*
1620 * Guarantee 3/8*16==6 for the graph part
1621 * and 5/8*16==10 for the filename part
1622 */
1623 if (width < 16 + 6 + number_width)
1624 width = 16 + 6 + number_width;
1625
1626 /*
1627 * First assign sizes that are wanted, ignoring available width.
1628 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1629 * starting from "XXX" should fit in graph_width.
1630 */
1631 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1632 if (options->stat_graph_width &&
1633 options->stat_graph_width < graph_width)
1634 graph_width = options->stat_graph_width;
1635
1636 name_width = (options->stat_name_width > 0 &&
1637 options->stat_name_width < max_len) ?
1638 options->stat_name_width : max_len;
1639
1640 /*
1641 * Adjust adjustable widths not to exceed maximum width
1642 */
1643 if (name_width + number_width + 6 + graph_width > width) {
1644 if (graph_width > width * 3/8 - number_width - 6) {
1645 graph_width = width * 3/8 - number_width - 6;
1646 if (graph_width < 6)
1647 graph_width = 6;
1648 }
1649
1650 if (options->stat_graph_width &&
1651 graph_width > options->stat_graph_width)
1652 graph_width = options->stat_graph_width;
1653 if (name_width > width - number_width - 6 - graph_width)
1654 name_width = width - number_width - 6 - graph_width;
1655 else
1656 graph_width = width - number_width - 6 - name_width;
1657 }
1658
1659 /*
1660 * From here name_width is the width of the name area,
1661 * and graph_width is the width of the graph area.
1662 * max_change is used to scale graph properly.
1663 */
1664 for (i = 0; i < count; i++) {
1665 const char *prefix = "";
1666 struct diffstat_file *file = data->files[i];
1667 char *name = file->print_name;
1668 uintmax_t added = file->added;
1669 uintmax_t deleted = file->deleted;
1670 int name_len;
1671
1672 if (!file->is_interesting && (added + deleted == 0))
1673 continue;
1674
1675 /*
1676 * "scale" the filename
1677 */
1678 len = name_width;
1679 name_len = strlen(name);
1680 if (name_width < name_len) {
1681 char *slash;
1682 prefix = "...";
1683 len -= 3;
1684 name += name_len - len;
1685 slash = strchr(name, '/');
1686 if (slash)
1687 name = slash;
1688 }
1689
1690 if (file->is_binary) {
1691 fprintf(options->file, "%s", line_prefix);
1692 show_name(options->file, prefix, name, len);
1693 fprintf(options->file, " %*s", number_width, "Bin");
1694 if (!added && !deleted) {
1695 putc('\n', options->file);
1696 continue;
1697 }
1698 fprintf(options->file, " %s%"PRIuMAX"%s",
1699 del_c, deleted, reset);
1700 fprintf(options->file, " -> ");
1701 fprintf(options->file, "%s%"PRIuMAX"%s",
1702 add_c, added, reset);
1703 fprintf(options->file, " bytes");
1704 fprintf(options->file, "\n");
1705 continue;
1706 }
1707 else if (file->is_unmerged) {
1708 fprintf(options->file, "%s", line_prefix);
1709 show_name(options->file, prefix, name, len);
1710 fprintf(options->file, " Unmerged\n");
1711 continue;
1712 }
1713
1714 /*
1715 * scale the add/delete
1716 */
1717 add = added;
1718 del = deleted;
1719
1720 if (graph_width <= max_change) {
1721 int total = scale_linear(add + del, graph_width, max_change);
1722 if (total < 2 && add && del)
1723 /* width >= 2 due to the sanity check */
1724 total = 2;
1725 if (add < del) {
1726 add = scale_linear(add, graph_width, max_change);
1727 del = total - add;
1728 } else {
1729 del = scale_linear(del, graph_width, max_change);
1730 add = total - del;
1731 }
1732 }
1733 fprintf(options->file, "%s", line_prefix);
1734 show_name(options->file, prefix, name, len);
1735 fprintf(options->file, " %*"PRIuMAX"%s",
1736 number_width, added + deleted,
1737 added + deleted ? " " : "");
1738 show_graph(options->file, '+', add, add_c, reset);
1739 show_graph(options->file, '-', del, del_c, reset);
1740 fprintf(options->file, "\n");
1741 }
1742
1743 for (i = 0; i < data->nr; i++) {
1744 struct diffstat_file *file = data->files[i];
1745 uintmax_t added = file->added;
1746 uintmax_t deleted = file->deleted;
1747
1748 if (file->is_unmerged ||
1749 (!file->is_interesting && (added + deleted == 0))) {
1750 total_files--;
1751 continue;
1752 }
1753
1754 if (!file->is_binary) {
1755 adds += added;
1756 dels += deleted;
1757 }
1758 if (i < count)
1759 continue;
1760 if (!extra_shown)
1761 fprintf(options->file, "%s ...\n", line_prefix);
1762 extra_shown = 1;
1763 }
1764 fprintf(options->file, "%s", line_prefix);
1765 print_stat_summary(options->file, total_files, adds, dels);
1766 }
1767
1768 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1769 {
1770 int i, adds = 0, dels = 0, total_files = data->nr;
1771
1772 if (data->nr == 0)
1773 return;
1774
1775 for (i = 0; i < data->nr; i++) {
1776 int added = data->files[i]->added;
1777 int deleted= data->files[i]->deleted;
1778
1779 if (data->files[i]->is_unmerged ||
1780 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1781 total_files--;
1782 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1783 adds += added;
1784 dels += deleted;
1785 }
1786 }
1787 fprintf(options->file, "%s", diff_line_prefix(options));
1788 print_stat_summary(options->file, total_files, adds, dels);
1789 }
1790
1791 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1792 {
1793 int i;
1794
1795 if (data->nr == 0)
1796 return;
1797
1798 for (i = 0; i < data->nr; i++) {
1799 struct diffstat_file *file = data->files[i];
1800
1801 fprintf(options->file, "%s", diff_line_prefix(options));
1802
1803 if (file->is_binary)
1804 fprintf(options->file, "-\t-\t");
1805 else
1806 fprintf(options->file,
1807 "%"PRIuMAX"\t%"PRIuMAX"\t",
1808 file->added, file->deleted);
1809 if (options->line_termination) {
1810 fill_print_name(file);
1811 if (!file->is_renamed)
1812 write_name_quoted(file->name, options->file,
1813 options->line_termination);
1814 else {
1815 fputs(file->print_name, options->file);
1816 putc(options->line_termination, options->file);
1817 }
1818 } else {
1819 if (file->is_renamed) {
1820 putc('\0', options->file);
1821 write_name_quoted(file->from_name, options->file, '\0');
1822 }
1823 write_name_quoted(file->name, options->file, '\0');
1824 }
1825 }
1826 }
1827
1828 struct dirstat_file {
1829 const char *name;
1830 unsigned long changed;
1831 };
1832
1833 struct dirstat_dir {
1834 struct dirstat_file *files;
1835 int alloc, nr, permille, cumulative;
1836 };
1837
1838 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1839 unsigned long changed, const char *base, int baselen)
1840 {
1841 unsigned long this_dir = 0;
1842 unsigned int sources = 0;
1843 const char *line_prefix = diff_line_prefix(opt);
1844
1845 while (dir->nr) {
1846 struct dirstat_file *f = dir->files;
1847 int namelen = strlen(f->name);
1848 unsigned long this;
1849 char *slash;
1850
1851 if (namelen < baselen)
1852 break;
1853 if (memcmp(f->name, base, baselen))
1854 break;
1855 slash = strchr(f->name + baselen, '/');
1856 if (slash) {
1857 int newbaselen = slash + 1 - f->name;
1858 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1859 sources++;
1860 } else {
1861 this = f->changed;
1862 dir->files++;
1863 dir->nr--;
1864 sources += 2;
1865 }
1866 this_dir += this;
1867 }
1868
1869 /*
1870 * We don't report dirstat's for
1871 * - the top level
1872 * - or cases where everything came from a single directory
1873 * under this directory (sources == 1).
1874 */
1875 if (baselen && sources != 1) {
1876 if (this_dir) {
1877 int permille = this_dir * 1000 / changed;
1878 if (permille >= dir->permille) {
1879 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1880 permille / 10, permille % 10, baselen, base);
1881 if (!dir->cumulative)
1882 return 0;
1883 }
1884 }
1885 }
1886 return this_dir;
1887 }
1888
1889 static int dirstat_compare(const void *_a, const void *_b)
1890 {
1891 const struct dirstat_file *a = _a;
1892 const struct dirstat_file *b = _b;
1893 return strcmp(a->name, b->name);
1894 }
1895
1896 static void show_dirstat(struct diff_options *options)
1897 {
1898 int i;
1899 unsigned long changed;
1900 struct dirstat_dir dir;
1901 struct diff_queue_struct *q = &diff_queued_diff;
1902
1903 dir.files = NULL;
1904 dir.alloc = 0;
1905 dir.nr = 0;
1906 dir.permille = options->dirstat_permille;
1907 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1908
1909 changed = 0;
1910 for (i = 0; i < q->nr; i++) {
1911 struct diff_filepair *p = q->queue[i];
1912 const char *name;
1913 unsigned long copied, added, damage;
1914 int content_changed;
1915
1916 name = p->two->path ? p->two->path : p->one->path;
1917
1918 if (p->one->sha1_valid && p->two->sha1_valid)
1919 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1920 else
1921 content_changed = 1;
1922
1923 if (!content_changed) {
1924 /*
1925 * The SHA1 has not changed, so pre-/post-content is
1926 * identical. We can therefore skip looking at the
1927 * file contents altogether.
1928 */
1929 damage = 0;
1930 goto found_damage;
1931 }
1932
1933 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1934 /*
1935 * In --dirstat-by-file mode, we don't really need to
1936 * look at the actual file contents at all.
1937 * The fact that the SHA1 changed is enough for us to
1938 * add this file to the list of results
1939 * (with each file contributing equal damage).
1940 */
1941 damage = 1;
1942 goto found_damage;
1943 }
1944
1945 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1946 diff_populate_filespec(p->one, 0);
1947 diff_populate_filespec(p->two, 0);
1948 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1949 &copied, &added);
1950 diff_free_filespec_data(p->one);
1951 diff_free_filespec_data(p->two);
1952 } else if (DIFF_FILE_VALID(p->one)) {
1953 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1954 copied = added = 0;
1955 diff_free_filespec_data(p->one);
1956 } else if (DIFF_FILE_VALID(p->two)) {
1957 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1958 copied = 0;
1959 added = p->two->size;
1960 diff_free_filespec_data(p->two);
1961 } else
1962 continue;
1963
1964 /*
1965 * Original minus copied is the removed material,
1966 * added is the new material. They are both damages
1967 * made to the preimage.
1968 * If the resulting damage is zero, we know that
1969 * diffcore_count_changes() considers the two entries to
1970 * be identical, but since content_changed is true, we
1971 * know that there must have been _some_ kind of change,
1972 * so we force all entries to have damage > 0.
1973 */
1974 damage = (p->one->size - copied) + added;
1975 if (!damage)
1976 damage = 1;
1977
1978 found_damage:
1979 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1980 dir.files[dir.nr].name = name;
1981 dir.files[dir.nr].changed = damage;
1982 changed += damage;
1983 dir.nr++;
1984 }
1985
1986 /* This can happen even with many files, if everything was renames */
1987 if (!changed)
1988 return;
1989
1990 /* Show all directories with more than x% of the changes */
1991 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1992 gather_dirstat(options, &dir, changed, "", 0);
1993 }
1994
1995 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1996 {
1997 int i;
1998 unsigned long changed;
1999 struct dirstat_dir dir;
2000
2001 if (data->nr == 0)
2002 return;
2003
2004 dir.files = NULL;
2005 dir.alloc = 0;
2006 dir.nr = 0;
2007 dir.permille = options->dirstat_permille;
2008 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2009
2010 changed = 0;
2011 for (i = 0; i < data->nr; i++) {
2012 struct diffstat_file *file = data->files[i];
2013 unsigned long damage = file->added + file->deleted;
2014 if (file->is_binary)
2015 /*
2016 * binary files counts bytes, not lines. Must find some
2017 * way to normalize binary bytes vs. textual lines.
2018 * The following heuristic assumes that there are 64
2019 * bytes per "line".
2020 * This is stupid and ugly, but very cheap...
2021 */
2022 damage = (damage + 63) / 64;
2023 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2024 dir.files[dir.nr].name = file->name;
2025 dir.files[dir.nr].changed = damage;
2026 changed += damage;
2027 dir.nr++;
2028 }
2029
2030 /* This can happen even with many files, if everything was renames */
2031 if (!changed)
2032 return;
2033
2034 /* Show all directories with more than x% of the changes */
2035 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2036 gather_dirstat(options, &dir, changed, "", 0);
2037 }
2038
2039 static void free_diffstat_info(struct diffstat_t *diffstat)
2040 {
2041 int i;
2042 for (i = 0; i < diffstat->nr; i++) {
2043 struct diffstat_file *f = diffstat->files[i];
2044 if (f->name != f->print_name)
2045 free(f->print_name);
2046 free(f->name);
2047 free(f->from_name);
2048 free(f);
2049 }
2050 free(diffstat->files);
2051 }
2052
2053 struct checkdiff_t {
2054 const char *filename;
2055 int lineno;
2056 int conflict_marker_size;
2057 struct diff_options *o;
2058 unsigned ws_rule;
2059 unsigned status;
2060 };
2061
2062 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2063 {
2064 char firstchar;
2065 int cnt;
2066
2067 if (len < marker_size + 1)
2068 return 0;
2069 firstchar = line[0];
2070 switch (firstchar) {
2071 case '=': case '>': case '<': case '|':
2072 break;
2073 default:
2074 return 0;
2075 }
2076 for (cnt = 1; cnt < marker_size; cnt++)
2077 if (line[cnt] != firstchar)
2078 return 0;
2079 /* line[1] thru line[marker_size-1] are same as firstchar */
2080 if (len < marker_size + 1 || !isspace(line[marker_size]))
2081 return 0;
2082 return 1;
2083 }
2084
2085 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2086 {
2087 struct checkdiff_t *data = priv;
2088 int marker_size = data->conflict_marker_size;
2089 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2090 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2091 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2092 char *err;
2093 const char *line_prefix;
2094
2095 assert(data->o);
2096 line_prefix = diff_line_prefix(data->o);
2097
2098 if (line[0] == '+') {
2099 unsigned bad;
2100 data->lineno++;
2101 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2102 data->status |= 1;
2103 fprintf(data->o->file,
2104 "%s%s:%d: leftover conflict marker\n",
2105 line_prefix, data->filename, data->lineno);
2106 }
2107 bad = ws_check(line + 1, len - 1, data->ws_rule);
2108 if (!bad)
2109 return;
2110 data->status |= bad;
2111 err = whitespace_error_string(bad);
2112 fprintf(data->o->file, "%s%s:%d: %s.\n",
2113 line_prefix, data->filename, data->lineno, err);
2114 free(err);
2115 emit_line(data->o, set, reset, line, 1);
2116 ws_check_emit(line + 1, len - 1, data->ws_rule,
2117 data->o->file, set, reset, ws);
2118 } else if (line[0] == ' ') {
2119 data->lineno++;
2120 } else if (line[0] == '@') {
2121 char *plus = strchr(line, '+');
2122 if (plus)
2123 data->lineno = strtol(plus, NULL, 10) - 1;
2124 else
2125 die("invalid diff");
2126 }
2127 }
2128
2129 static unsigned char *deflate_it(char *data,
2130 unsigned long size,
2131 unsigned long *result_size)
2132 {
2133 int bound;
2134 unsigned char *deflated;
2135 git_zstream stream;
2136
2137 git_deflate_init(&stream, zlib_compression_level);
2138 bound = git_deflate_bound(&stream, size);
2139 deflated = xmalloc(bound);
2140 stream.next_out = deflated;
2141 stream.avail_out = bound;
2142
2143 stream.next_in = (unsigned char *)data;
2144 stream.avail_in = size;
2145 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2146 ; /* nothing */
2147 git_deflate_end(&stream);
2148 *result_size = stream.total_out;
2149 return deflated;
2150 }
2151
2152 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2153 const char *prefix)
2154 {
2155 void *cp;
2156 void *delta;
2157 void *deflated;
2158 void *data;
2159 unsigned long orig_size;
2160 unsigned long delta_size;
2161 unsigned long deflate_size;
2162 unsigned long data_size;
2163
2164 /* We could do deflated delta, or we could do just deflated two,
2165 * whichever is smaller.
2166 */
2167 delta = NULL;
2168 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2169 if (one->size && two->size) {
2170 delta = diff_delta(one->ptr, one->size,
2171 two->ptr, two->size,
2172 &delta_size, deflate_size);
2173 if (delta) {
2174 void *to_free = delta;
2175 orig_size = delta_size;
2176 delta = deflate_it(delta, delta_size, &delta_size);
2177 free(to_free);
2178 }
2179 }
2180
2181 if (delta && delta_size < deflate_size) {
2182 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2183 free(deflated);
2184 data = delta;
2185 data_size = delta_size;
2186 }
2187 else {
2188 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2189 free(delta);
2190 data = deflated;
2191 data_size = deflate_size;
2192 }
2193
2194 /* emit data encoded in base85 */
2195 cp = data;
2196 while (data_size) {
2197 int bytes = (52 < data_size) ? 52 : data_size;
2198 char line[70];
2199 data_size -= bytes;
2200 if (bytes <= 26)
2201 line[0] = bytes + 'A' - 1;
2202 else
2203 line[0] = bytes - 26 + 'a' - 1;
2204 encode_85(line + 1, cp, bytes);
2205 cp = (char *) cp + bytes;
2206 fprintf(file, "%s", prefix);
2207 fputs(line, file);
2208 fputc('\n', file);
2209 }
2210 fprintf(file, "%s\n", prefix);
2211 free(data);
2212 }
2213
2214 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2215 const char *prefix)
2216 {
2217 fprintf(file, "%sGIT binary patch\n", prefix);
2218 emit_binary_diff_body(file, one, two, prefix);
2219 emit_binary_diff_body(file, two, one, prefix);
2220 }
2221
2222 int diff_filespec_is_binary(struct diff_filespec *one)
2223 {
2224 if (one->is_binary == -1) {
2225 diff_filespec_load_driver(one);
2226 if (one->driver->binary != -1)
2227 one->is_binary = one->driver->binary;
2228 else {
2229 if (!one->data && DIFF_FILE_VALID(one))
2230 diff_populate_filespec(one, CHECK_BINARY);
2231 if (one->is_binary == -1 && one->data)
2232 one->is_binary = buffer_is_binary(one->data,
2233 one->size);
2234 if (one->is_binary == -1)
2235 one->is_binary = 0;
2236 }
2237 }
2238 return one->is_binary;
2239 }
2240
2241 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2242 {
2243 diff_filespec_load_driver(one);
2244 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2245 }
2246
2247 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2248 {
2249 if (!options->a_prefix)
2250 options->a_prefix = a;
2251 if (!options->b_prefix)
2252 options->b_prefix = b;
2253 }
2254
2255 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2256 {
2257 if (!DIFF_FILE_VALID(one))
2258 return NULL;
2259
2260 diff_filespec_load_driver(one);
2261 return userdiff_get_textconv(one->driver);
2262 }
2263
2264 static void builtin_diff(const char *name_a,
2265 const char *name_b,
2266 struct diff_filespec *one,
2267 struct diff_filespec *two,
2268 const char *xfrm_msg,
2269 int must_show_header,
2270 struct diff_options *o,
2271 int complete_rewrite)
2272 {
2273 mmfile_t mf1, mf2;
2274 const char *lbl[2];
2275 char *a_one, *b_two;
2276 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2277 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2278 const char *a_prefix, *b_prefix;
2279 struct userdiff_driver *textconv_one = NULL;
2280 struct userdiff_driver *textconv_two = NULL;
2281 struct strbuf header = STRBUF_INIT;
2282 const char *line_prefix = diff_line_prefix(o);
2283
2284 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2285 (!one->mode || S_ISGITLINK(one->mode)) &&
2286 (!two->mode || S_ISGITLINK(two->mode))) {
2287 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2288 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2289 show_submodule_summary(o->file, one->path ? one->path : two->path,
2290 line_prefix,
2291 one->sha1, two->sha1, two->dirty_submodule,
2292 meta, del, add, reset);
2293 return;
2294 }
2295
2296 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2297 textconv_one = get_textconv(one);
2298 textconv_two = get_textconv(two);
2299 }
2300
2301 diff_set_mnemonic_prefix(o, "a/", "b/");
2302 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2303 a_prefix = o->b_prefix;
2304 b_prefix = o->a_prefix;
2305 } else {
2306 a_prefix = o->a_prefix;
2307 b_prefix = o->b_prefix;
2308 }
2309
2310 /* Never use a non-valid filename anywhere if at all possible */
2311 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2312 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2313
2314 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2315 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2316 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2317 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2318 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2319 if (lbl[0][0] == '/') {
2320 /* /dev/null */
2321 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2322 if (xfrm_msg)
2323 strbuf_addstr(&header, xfrm_msg);
2324 must_show_header = 1;
2325 }
2326 else if (lbl[1][0] == '/') {
2327 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2328 if (xfrm_msg)
2329 strbuf_addstr(&header, xfrm_msg);
2330 must_show_header = 1;
2331 }
2332 else {
2333 if (one->mode != two->mode) {
2334 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2335 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2336 must_show_header = 1;
2337 }
2338 if (xfrm_msg)
2339 strbuf_addstr(&header, xfrm_msg);
2340
2341 /*
2342 * we do not run diff between different kind
2343 * of objects.
2344 */
2345 if ((one->mode ^ two->mode) & S_IFMT)
2346 goto free_ab_and_return;
2347 if (complete_rewrite &&
2348 (textconv_one || !diff_filespec_is_binary(one)) &&
2349 (textconv_two || !diff_filespec_is_binary(two))) {
2350 fprintf(o->file, "%s", header.buf);
2351 strbuf_reset(&header);
2352 emit_rewrite_diff(name_a, name_b, one, two,
2353 textconv_one, textconv_two, o);
2354 o->found_changes = 1;
2355 goto free_ab_and_return;
2356 }
2357 }
2358
2359 if (o->irreversible_delete && lbl[1][0] == '/') {
2360 fprintf(o->file, "%s", header.buf);
2361 strbuf_reset(&header);
2362 goto free_ab_and_return;
2363 } else if (!DIFF_OPT_TST(o, TEXT) &&
2364 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2365 (!textconv_two && diff_filespec_is_binary(two)) )) {
2366 if (!one->data && !two->data &&
2367 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2368 !DIFF_OPT_TST(o, BINARY)) {
2369 if (!hashcmp(one->sha1, two->sha1)) {
2370 if (must_show_header)
2371 fprintf(o->file, "%s", header.buf);
2372 goto free_ab_and_return;
2373 }
2374 fprintf(o->file, "%s", header.buf);
2375 fprintf(o->file, "%sBinary files %s and %s differ\n",
2376 line_prefix, lbl[0], lbl[1]);
2377 goto free_ab_and_return;
2378 }
2379 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2380 die("unable to read files to diff");
2381 /* Quite common confusing case */
2382 if (mf1.size == mf2.size &&
2383 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2384 if (must_show_header)
2385 fprintf(o->file, "%s", header.buf);
2386 goto free_ab_and_return;
2387 }
2388 fprintf(o->file, "%s", header.buf);
2389 strbuf_reset(&header);
2390 if (DIFF_OPT_TST(o, BINARY))
2391 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2392 else
2393 fprintf(o->file, "%sBinary files %s and %s differ\n",
2394 line_prefix, lbl[0], lbl[1]);
2395 o->found_changes = 1;
2396 } else {
2397 /* Crazy xdl interfaces.. */
2398 const char *diffopts = getenv("GIT_DIFF_OPTS");
2399 const char *v;
2400 xpparam_t xpp;
2401 xdemitconf_t xecfg;
2402 struct emit_callback ecbdata;
2403 const struct userdiff_funcname *pe;
2404
2405 if (must_show_header) {
2406 fprintf(o->file, "%s", header.buf);
2407 strbuf_reset(&header);
2408 }
2409
2410 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2411 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2412
2413 pe = diff_funcname_pattern(one);
2414 if (!pe)
2415 pe = diff_funcname_pattern(two);
2416
2417 memset(&xpp, 0, sizeof(xpp));
2418 memset(&xecfg, 0, sizeof(xecfg));
2419 memset(&ecbdata, 0, sizeof(ecbdata));
2420 ecbdata.label_path = lbl;
2421 ecbdata.color_diff = want_color(o->use_color);
2422 ecbdata.found_changesp = &o->found_changes;
2423 ecbdata.ws_rule = whitespace_rule(name_b);
2424 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2425 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2426 ecbdata.opt = o;
2427 ecbdata.header = header.len ? &header : NULL;
2428 xpp.flags = o->xdl_opts;
2429 xecfg.ctxlen = o->context;
2430 xecfg.interhunkctxlen = o->interhunkcontext;
2431 xecfg.flags = XDL_EMIT_FUNCNAMES;
2432 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2433 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2434 if (pe)
2435 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2436 if (!diffopts)
2437 ;
2438 else if (skip_prefix(diffopts, "--unified=", &v))
2439 xecfg.ctxlen = strtoul(v, NULL, 10);
2440 else if (skip_prefix(diffopts, "-u", &v))
2441 xecfg.ctxlen = strtoul(v, NULL, 10);
2442 if (o->word_diff)
2443 init_diff_words_data(&ecbdata, o, one, two);
2444 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2445 &xpp, &xecfg);
2446 if (o->word_diff)
2447 free_diff_words_data(&ecbdata);
2448 if (textconv_one)
2449 free(mf1.ptr);
2450 if (textconv_two)
2451 free(mf2.ptr);
2452 xdiff_clear_find_func(&xecfg);
2453 }
2454
2455 free_ab_and_return:
2456 strbuf_release(&header);
2457 diff_free_filespec_data(one);
2458 diff_free_filespec_data(two);
2459 free(a_one);
2460 free(b_two);
2461 return;
2462 }
2463
2464 static void builtin_diffstat(const char *name_a, const char *name_b,
2465 struct diff_filespec *one,
2466 struct diff_filespec *two,
2467 struct diffstat_t *diffstat,
2468 struct diff_options *o,
2469 struct diff_filepair *p)
2470 {
2471 mmfile_t mf1, mf2;
2472 struct diffstat_file *data;
2473 int same_contents;
2474 int complete_rewrite = 0;
2475
2476 if (!DIFF_PAIR_UNMERGED(p)) {
2477 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2478 complete_rewrite = 1;
2479 }
2480
2481 data = diffstat_add(diffstat, name_a, name_b);
2482 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2483
2484 if (!one || !two) {
2485 data->is_unmerged = 1;
2486 return;
2487 }
2488
2489 same_contents = !hashcmp(one->sha1, two->sha1);
2490
2491 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2492 data->is_binary = 1;
2493 if (same_contents) {
2494 data->added = 0;
2495 data->deleted = 0;
2496 } else {
2497 data->added = diff_filespec_size(two);
2498 data->deleted = diff_filespec_size(one);
2499 }
2500 }
2501
2502 else if (complete_rewrite) {
2503 diff_populate_filespec(one, 0);
2504 diff_populate_filespec(two, 0);
2505 data->deleted = count_lines(one->data, one->size);
2506 data->added = count_lines(two->data, two->size);
2507 }
2508
2509 else if (!same_contents) {
2510 /* Crazy xdl interfaces.. */
2511 xpparam_t xpp;
2512 xdemitconf_t xecfg;
2513
2514 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2515 die("unable to read files to diff");
2516
2517 memset(&xpp, 0, sizeof(xpp));
2518 memset(&xecfg, 0, sizeof(xecfg));
2519 xpp.flags = o->xdl_opts;
2520 xecfg.ctxlen = o->context;
2521 xecfg.interhunkctxlen = o->interhunkcontext;
2522 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2523 &xpp, &xecfg);
2524 }
2525
2526 diff_free_filespec_data(one);
2527 diff_free_filespec_data(two);
2528 }
2529
2530 static void builtin_checkdiff(const char *name_a, const char *name_b,
2531 const char *attr_path,
2532 struct diff_filespec *one,
2533 struct diff_filespec *two,
2534 struct diff_options *o)
2535 {
2536 mmfile_t mf1, mf2;
2537 struct checkdiff_t data;
2538
2539 if (!two)
2540 return;
2541
2542 memset(&data, 0, sizeof(data));
2543 data.filename = name_b ? name_b : name_a;
2544 data.lineno = 0;
2545 data.o = o;
2546 data.ws_rule = whitespace_rule(attr_path);
2547 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2548
2549 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2550 die("unable to read files to diff");
2551
2552 /*
2553 * All the other codepaths check both sides, but not checking
2554 * the "old" side here is deliberate. We are checking the newly
2555 * introduced changes, and as long as the "new" side is text, we
2556 * can and should check what it introduces.
2557 */
2558 if (diff_filespec_is_binary(two))
2559 goto free_and_return;
2560 else {
2561 /* Crazy xdl interfaces.. */
2562 xpparam_t xpp;
2563 xdemitconf_t xecfg;
2564
2565 memset(&xpp, 0, sizeof(xpp));
2566 memset(&xecfg, 0, sizeof(xecfg));
2567 xecfg.ctxlen = 1; /* at least one context line */
2568 xpp.flags = 0;
2569 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2570 &xpp, &xecfg);
2571
2572 if (data.ws_rule & WS_BLANK_AT_EOF) {
2573 struct emit_callback ecbdata;
2574 int blank_at_eof;
2575
2576 ecbdata.ws_rule = data.ws_rule;
2577 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2578 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2579
2580 if (blank_at_eof) {
2581 static char *err;
2582 if (!err)
2583 err = whitespace_error_string(WS_BLANK_AT_EOF);
2584 fprintf(o->file, "%s:%d: %s.\n",
2585 data.filename, blank_at_eof, err);
2586 data.status = 1; /* report errors */
2587 }
2588 }
2589 }
2590 free_and_return:
2591 diff_free_filespec_data(one);
2592 diff_free_filespec_data(two);
2593 if (data.status)
2594 DIFF_OPT_SET(o, CHECK_FAILED);
2595 }
2596
2597 struct diff_filespec *alloc_filespec(const char *path)
2598 {
2599 int namelen = strlen(path);
2600 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2601
2602 memset(spec, 0, sizeof(*spec));
2603 spec->path = (char *)(spec + 1);
2604 memcpy(spec->path, path, namelen+1);
2605 spec->count = 1;
2606 spec->is_binary = -1;
2607 return spec;
2608 }
2609
2610 void free_filespec(struct diff_filespec *spec)
2611 {
2612 if (!--spec->count) {
2613 diff_free_filespec_data(spec);
2614 free(spec);
2615 }
2616 }
2617
2618 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2619 int sha1_valid, unsigned short mode)
2620 {
2621 if (mode) {
2622 spec->mode = canon_mode(mode);
2623 hashcpy(spec->sha1, sha1);
2624 spec->sha1_valid = sha1_valid;
2625 }
2626 }
2627
2628 /*
2629 * Given a name and sha1 pair, if the index tells us the file in
2630 * the work tree has that object contents, return true, so that
2631 * prepare_temp_file() does not have to inflate and extract.
2632 */
2633 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2634 {
2635 const struct cache_entry *ce;
2636 struct stat st;
2637 int pos, len;
2638
2639 /*
2640 * We do not read the cache ourselves here, because the
2641 * benchmark with my previous version that always reads cache
2642 * shows that it makes things worse for diff-tree comparing
2643 * two linux-2.6 kernel trees in an already checked out work
2644 * tree. This is because most diff-tree comparisons deal with
2645 * only a small number of files, while reading the cache is
2646 * expensive for a large project, and its cost outweighs the
2647 * savings we get by not inflating the object to a temporary
2648 * file. Practically, this code only helps when we are used
2649 * by diff-cache --cached, which does read the cache before
2650 * calling us.
2651 */
2652 if (!active_cache)
2653 return 0;
2654
2655 /* We want to avoid the working directory if our caller
2656 * doesn't need the data in a normal file, this system
2657 * is rather slow with its stat/open/mmap/close syscalls,
2658 * and the object is contained in a pack file. The pack
2659 * is probably already open and will be faster to obtain
2660 * the data through than the working directory. Loose
2661 * objects however would tend to be slower as they need
2662 * to be individually opened and inflated.
2663 */
2664 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2665 return 0;
2666
2667 len = strlen(name);
2668 pos = cache_name_pos(name, len);
2669 if (pos < 0)
2670 return 0;
2671 ce = active_cache[pos];
2672
2673 /*
2674 * This is not the sha1 we are looking for, or
2675 * unreusable because it is not a regular file.
2676 */
2677 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2678 return 0;
2679
2680 /*
2681 * If ce is marked as "assume unchanged", there is no
2682 * guarantee that work tree matches what we are looking for.
2683 */
2684 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2685 return 0;
2686
2687 /*
2688 * If ce matches the file in the work tree, we can reuse it.
2689 */
2690 if (ce_uptodate(ce) ||
2691 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2692 return 1;
2693
2694 return 0;
2695 }
2696
2697 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2698 {
2699 int len;
2700 char *data = xmalloc(100), *dirty = "";
2701
2702 /* Are we looking at the work tree? */
2703 if (s->dirty_submodule)
2704 dirty = "-dirty";
2705
2706 len = snprintf(data, 100,
2707 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2708 s->data = data;
2709 s->size = len;
2710 s->should_free = 1;
2711 if (size_only) {
2712 s->data = NULL;
2713 free(data);
2714 }
2715 return 0;
2716 }
2717
2718 /*
2719 * While doing rename detection and pickaxe operation, we may need to
2720 * grab the data for the blob (or file) for our own in-core comparison.
2721 * diff_filespec has data and size fields for this purpose.
2722 */
2723 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2724 {
2725 int size_only = flags & CHECK_SIZE_ONLY;
2726 int err = 0;
2727 /*
2728 * demote FAIL to WARN to allow inspecting the situation
2729 * instead of refusing.
2730 */
2731 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2732 ? SAFE_CRLF_WARN
2733 : safe_crlf);
2734
2735 if (!DIFF_FILE_VALID(s))
2736 die("internal error: asking to populate invalid file.");
2737 if (S_ISDIR(s->mode))
2738 return -1;
2739
2740 if (s->data)
2741 return 0;
2742
2743 if (size_only && 0 < s->size)
2744 return 0;
2745
2746 if (S_ISGITLINK(s->mode))
2747 return diff_populate_gitlink(s, size_only);
2748
2749 if (!s->sha1_valid ||
2750 reuse_worktree_file(s->path, s->sha1, 0)) {
2751 struct strbuf buf = STRBUF_INIT;
2752 struct stat st;
2753 int fd;
2754
2755 if (lstat(s->path, &st) < 0) {
2756 if (errno == ENOENT) {
2757 err_empty:
2758 err = -1;
2759 empty:
2760 s->data = (char *)"";
2761 s->size = 0;
2762 return err;
2763 }
2764 }
2765 s->size = xsize_t(st.st_size);
2766 if (!s->size)
2767 goto empty;
2768 if (S_ISLNK(st.st_mode)) {
2769 struct strbuf sb = STRBUF_INIT;
2770
2771 if (strbuf_readlink(&sb, s->path, s->size))
2772 goto err_empty;
2773 s->size = sb.len;
2774 s->data = strbuf_detach(&sb, NULL);
2775 s->should_free = 1;
2776 return 0;
2777 }
2778 if (size_only)
2779 return 0;
2780 if ((flags & CHECK_BINARY) &&
2781 s->size > big_file_threshold && s->is_binary == -1) {
2782 s->is_binary = 1;
2783 return 0;
2784 }
2785 fd = open(s->path, O_RDONLY);
2786 if (fd < 0)
2787 goto err_empty;
2788 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2789 close(fd);
2790 s->should_munmap = 1;
2791
2792 /*
2793 * Convert from working tree format to canonical git format
2794 */
2795 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2796 size_t size = 0;
2797 munmap(s->data, s->size);
2798 s->should_munmap = 0;
2799 s->data = strbuf_detach(&buf, &size);
2800 s->size = size;
2801 s->should_free = 1;
2802 }
2803 }
2804 else {
2805 enum object_type type;
2806 if (size_only || (flags & CHECK_BINARY)) {
2807 type = sha1_object_info(s->sha1, &s->size);
2808 if (type < 0)
2809 die("unable to read %s", sha1_to_hex(s->sha1));
2810 if (size_only)
2811 return 0;
2812 if (s->size > big_file_threshold && s->is_binary == -1) {
2813 s->is_binary = 1;
2814 return 0;
2815 }
2816 }
2817 s->data = read_sha1_file(s->sha1, &type, &s->size);
2818 if (!s->data)
2819 die("unable to read %s", sha1_to_hex(s->sha1));
2820 s->should_free = 1;
2821 }
2822 return 0;
2823 }
2824
2825 void diff_free_filespec_blob(struct diff_filespec *s)
2826 {
2827 if (s->should_free)
2828 free(s->data);
2829 else if (s->should_munmap)
2830 munmap(s->data, s->size);
2831
2832 if (s->should_free || s->should_munmap) {
2833 s->should_free = s->should_munmap = 0;
2834 s->data = NULL;
2835 }
2836 }
2837
2838 void diff_free_filespec_data(struct diff_filespec *s)
2839 {
2840 diff_free_filespec_blob(s);
2841 free(s->cnt_data);
2842 s->cnt_data = NULL;
2843 }
2844
2845 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2846 void *blob,
2847 unsigned long size,
2848 const unsigned char *sha1,
2849 int mode)
2850 {
2851 int fd;
2852 struct strbuf buf = STRBUF_INIT;
2853 struct strbuf template = STRBUF_INIT;
2854 char *path_dup = xstrdup(path);
2855 const char *base = basename(path_dup);
2856
2857 /* Generate "XXXXXX_basename.ext" */
2858 strbuf_addstr(&template, "XXXXXX_");
2859 strbuf_addstr(&template, base);
2860
2861 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2862 strlen(base) + 1);
2863 if (fd < 0)
2864 die_errno("unable to create temp-file");
2865 if (convert_to_working_tree(path,
2866 (const char *)blob, (size_t)size, &buf)) {
2867 blob = buf.buf;
2868 size = buf.len;
2869 }
2870 if (write_in_full(fd, blob, size) != size)
2871 die_errno("unable to write temp-file");
2872 close(fd);
2873 temp->name = temp->tmp_path;
2874 strcpy(temp->hex, sha1_to_hex(sha1));
2875 temp->hex[40] = 0;
2876 sprintf(temp->mode, "%06o", mode);
2877 strbuf_release(&buf);
2878 strbuf_release(&template);
2879 free(path_dup);
2880 }
2881
2882 static struct diff_tempfile *prepare_temp_file(const char *name,
2883 struct diff_filespec *one)
2884 {
2885 struct diff_tempfile *temp = claim_diff_tempfile();
2886
2887 if (!DIFF_FILE_VALID(one)) {
2888 not_a_valid_file:
2889 /* A '-' entry produces this for file-2, and
2890 * a '+' entry produces this for file-1.
2891 */
2892 temp->name = "/dev/null";
2893 strcpy(temp->hex, ".");
2894 strcpy(temp->mode, ".");
2895 return temp;
2896 }
2897
2898 if (!remove_tempfile_installed) {
2899 atexit(remove_tempfile);
2900 sigchain_push_common(remove_tempfile_on_signal);
2901 remove_tempfile_installed = 1;
2902 }
2903
2904 if (!S_ISGITLINK(one->mode) &&
2905 (!one->sha1_valid ||
2906 reuse_worktree_file(name, one->sha1, 1))) {
2907 struct stat st;
2908 if (lstat(name, &st) < 0) {
2909 if (errno == ENOENT)
2910 goto not_a_valid_file;
2911 die_errno("stat(%s)", name);
2912 }
2913 if (S_ISLNK(st.st_mode)) {
2914 struct strbuf sb = STRBUF_INIT;
2915 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2916 die_errno("readlink(%s)", name);
2917 prep_temp_blob(name, temp, sb.buf, sb.len,
2918 (one->sha1_valid ?
2919 one->sha1 : null_sha1),
2920 (one->sha1_valid ?
2921 one->mode : S_IFLNK));
2922 strbuf_release(&sb);
2923 }
2924 else {
2925 /* we can borrow from the file in the work tree */
2926 temp->name = name;
2927 if (!one->sha1_valid)
2928 strcpy(temp->hex, sha1_to_hex(null_sha1));
2929 else
2930 strcpy(temp->hex, sha1_to_hex(one->sha1));
2931 /* Even though we may sometimes borrow the
2932 * contents from the work tree, we always want
2933 * one->mode. mode is trustworthy even when
2934 * !(one->sha1_valid), as long as
2935 * DIFF_FILE_VALID(one).
2936 */
2937 sprintf(temp->mode, "%06o", one->mode);
2938 }
2939 return temp;
2940 }
2941 else {
2942 if (diff_populate_filespec(one, 0))
2943 die("cannot read data blob for %s", one->path);
2944 prep_temp_blob(name, temp, one->data, one->size,
2945 one->sha1, one->mode);
2946 }
2947 return temp;
2948 }
2949
2950 static void add_external_diff_name(struct argv_array *argv,
2951 const char *name,
2952 struct diff_filespec *df)
2953 {
2954 struct diff_tempfile *temp = prepare_temp_file(name, df);
2955 argv_array_push(argv, temp->name);
2956 argv_array_push(argv, temp->hex);
2957 argv_array_push(argv, temp->mode);
2958 }
2959
2960 /* An external diff command takes:
2961 *
2962 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2963 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2964 *
2965 */
2966 static void run_external_diff(const char *pgm,
2967 const char *name,
2968 const char *other,
2969 struct diff_filespec *one,
2970 struct diff_filespec *two,
2971 const char *xfrm_msg,
2972 int complete_rewrite,
2973 struct diff_options *o)
2974 {
2975 struct argv_array argv = ARGV_ARRAY_INIT;
2976 struct argv_array env = ARGV_ARRAY_INIT;
2977 struct diff_queue_struct *q = &diff_queued_diff;
2978
2979 argv_array_push(&argv, pgm);
2980 argv_array_push(&argv, name);
2981
2982 if (one && two) {
2983 add_external_diff_name(&argv, name, one);
2984 if (!other)
2985 add_external_diff_name(&argv, name, two);
2986 else {
2987 add_external_diff_name(&argv, other, two);
2988 argv_array_push(&argv, other);
2989 argv_array_push(&argv, xfrm_msg);
2990 }
2991 }
2992
2993 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2994 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
2995
2996 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
2997 die(_("external diff died, stopping at %s"), name);
2998
2999 remove_tempfile();
3000 argv_array_clear(&argv);
3001 argv_array_clear(&env);
3002 }
3003
3004 static int similarity_index(struct diff_filepair *p)
3005 {
3006 return p->score * 100 / MAX_SCORE;
3007 }
3008
3009 static void fill_metainfo(struct strbuf *msg,
3010 const char *name,
3011 const char *other,
3012 struct diff_filespec *one,
3013 struct diff_filespec *two,
3014 struct diff_options *o,
3015 struct diff_filepair *p,
3016 int *must_show_header,
3017 int use_color)
3018 {
3019 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3020 const char *reset = diff_get_color(use_color, DIFF_RESET);
3021 const char *line_prefix = diff_line_prefix(o);
3022
3023 *must_show_header = 1;
3024 strbuf_init(msg, PATH_MAX * 2 + 300);
3025 switch (p->status) {
3026 case DIFF_STATUS_COPIED:
3027 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3028 line_prefix, set, similarity_index(p));
3029 strbuf_addf(msg, "%s\n%s%scopy from ",
3030 reset, line_prefix, set);
3031 quote_c_style(name, msg, NULL, 0);
3032 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3033 quote_c_style(other, msg, NULL, 0);
3034 strbuf_addf(msg, "%s\n", reset);
3035 break;
3036 case DIFF_STATUS_RENAMED:
3037 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3038 line_prefix, set, similarity_index(p));
3039 strbuf_addf(msg, "%s\n%s%srename from ",
3040 reset, line_prefix, set);
3041 quote_c_style(name, msg, NULL, 0);
3042 strbuf_addf(msg, "%s\n%s%srename to ",
3043 reset, line_prefix, set);
3044 quote_c_style(other, msg, NULL, 0);
3045 strbuf_addf(msg, "%s\n", reset);
3046 break;
3047 case DIFF_STATUS_MODIFIED:
3048 if (p->score) {
3049 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3050 line_prefix,
3051 set, similarity_index(p), reset);
3052 break;
3053 }
3054 /* fallthru */
3055 default:
3056 *must_show_header = 0;
3057 }
3058 if (one && two && hashcmp(one->sha1, two->sha1)) {
3059 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3060
3061 if (DIFF_OPT_TST(o, BINARY)) {
3062 mmfile_t mf;
3063 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3064 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3065 abbrev = 40;
3066 }
3067 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3068 find_unique_abbrev(one->sha1, abbrev));
3069 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3070 if (one->mode == two->mode)
3071 strbuf_addf(msg, " %06o", one->mode);
3072 strbuf_addf(msg, "%s\n", reset);
3073 }
3074 }
3075
3076 static void run_diff_cmd(const char *pgm,
3077 const char *name,
3078 const char *other,
3079 const char *attr_path,
3080 struct diff_filespec *one,
3081 struct diff_filespec *two,
3082 struct strbuf *msg,
3083 struct diff_options *o,
3084 struct diff_filepair *p)
3085 {
3086 const char *xfrm_msg = NULL;
3087 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3088 int must_show_header = 0;
3089
3090
3091 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3092 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3093 if (drv && drv->external)
3094 pgm = drv->external;
3095 }
3096
3097 if (msg) {
3098 /*
3099 * don't use colors when the header is intended for an
3100 * external diff driver
3101 */
3102 fill_metainfo(msg, name, other, one, two, o, p,
3103 &must_show_header,
3104 want_color(o->use_color) && !pgm);
3105 xfrm_msg = msg->len ? msg->buf : NULL;
3106 }
3107
3108 if (pgm) {
3109 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3110 complete_rewrite, o);
3111 return;
3112 }
3113 if (one && two)
3114 builtin_diff(name, other ? other : name,
3115 one, two, xfrm_msg, must_show_header,
3116 o, complete_rewrite);
3117 else
3118 fprintf(o->file, "* Unmerged path %s\n", name);
3119 }
3120
3121 static void diff_fill_sha1_info(struct diff_filespec *one)
3122 {
3123 if (DIFF_FILE_VALID(one)) {
3124 if (!one->sha1_valid) {
3125 struct stat st;
3126 if (one->is_stdin) {
3127 hashcpy(one->sha1, null_sha1);
3128 return;
3129 }
3130 if (lstat(one->path, &st) < 0)
3131 die_errno("stat '%s'", one->path);
3132 if (index_path(one->sha1, one->path, &st, 0))
3133 die("cannot hash %s", one->path);
3134 }
3135 }
3136 else
3137 hashclr(one->sha1);
3138 }
3139
3140 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3141 {
3142 /* Strip the prefix but do not molest /dev/null and absolute paths */
3143 if (*namep && **namep != '/') {
3144 *namep += prefix_length;
3145 if (**namep == '/')
3146 ++*namep;
3147 }
3148 if (*otherp && **otherp != '/') {
3149 *otherp += prefix_length;
3150 if (**otherp == '/')
3151 ++*otherp;
3152 }
3153 }
3154
3155 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3156 {
3157 const char *pgm = external_diff();
3158 struct strbuf msg;
3159 struct diff_filespec *one = p->one;
3160 struct diff_filespec *two = p->two;
3161 const char *name;
3162 const char *other;
3163 const char *attr_path;
3164
3165 name = p->one->path;
3166 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3167 attr_path = name;
3168 if (o->prefix_length)
3169 strip_prefix(o->prefix_length, &name, &other);
3170
3171 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3172 pgm = NULL;
3173
3174 if (DIFF_PAIR_UNMERGED(p)) {
3175 run_diff_cmd(pgm, name, NULL, attr_path,
3176 NULL, NULL, NULL, o, p);
3177 return;
3178 }
3179
3180 diff_fill_sha1_info(one);
3181 diff_fill_sha1_info(two);
3182
3183 if (!pgm &&
3184 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3185 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3186 /*
3187 * a filepair that changes between file and symlink
3188 * needs to be split into deletion and creation.
3189 */
3190 struct diff_filespec *null = alloc_filespec(two->path);
3191 run_diff_cmd(NULL, name, other, attr_path,
3192 one, null, &msg, o, p);
3193 free(null);
3194 strbuf_release(&msg);
3195
3196 null = alloc_filespec(one->path);
3197 run_diff_cmd(NULL, name, other, attr_path,
3198 null, two, &msg, o, p);
3199 free(null);
3200 }
3201 else
3202 run_diff_cmd(pgm, name, other, attr_path,
3203 one, two, &msg, o, p);
3204
3205 strbuf_release(&msg);
3206 }
3207
3208 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3209 struct diffstat_t *diffstat)
3210 {
3211 const char *name;
3212 const char *other;
3213
3214 if (DIFF_PAIR_UNMERGED(p)) {
3215 /* unmerged */
3216 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3217 return;
3218 }
3219
3220 name = p->one->path;
3221 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3222
3223 if (o->prefix_length)
3224 strip_prefix(o->prefix_length, &name, &other);
3225
3226 diff_fill_sha1_info(p->one);
3227 diff_fill_sha1_info(p->two);
3228
3229 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3230 }
3231
3232 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3233 {
3234 const char *name;
3235 const char *other;
3236 const char *attr_path;
3237
3238 if (DIFF_PAIR_UNMERGED(p)) {
3239 /* unmerged */
3240 return;
3241 }
3242
3243 name = p->one->path;
3244 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3245 attr_path = other ? other : name;
3246
3247 if (o->prefix_length)
3248 strip_prefix(o->prefix_length, &name, &other);
3249
3250 diff_fill_sha1_info(p->one);
3251 diff_fill_sha1_info(p->two);
3252
3253 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3254 }
3255
3256 void diff_setup(struct diff_options *options)
3257 {
3258 memcpy(options, &default_diff_options, sizeof(*options));
3259
3260 options->file = stdout;
3261
3262 options->line_termination = '\n';
3263 options->break_opt = -1;
3264 options->rename_limit = -1;
3265 options->dirstat_permille = diff_dirstat_permille_default;
3266 options->context = diff_context_default;
3267 options->ws_error_highlight = WSEH_NEW;
3268 DIFF_OPT_SET(options, RENAME_EMPTY);
3269
3270 /* pathchange left =NULL by default */
3271 options->change = diff_change;
3272 options->add_remove = diff_addremove;
3273 options->use_color = diff_use_color_default;
3274 options->detect_rename = diff_detect_rename_default;
3275 options->xdl_opts |= diff_algorithm;
3276
3277 options->orderfile = diff_order_file_cfg;
3278
3279 if (diff_no_prefix) {
3280 options->a_prefix = options->b_prefix = "";
3281 } else if (!diff_mnemonic_prefix) {
3282 options->a_prefix = "a/";
3283 options->b_prefix = "b/";
3284 }
3285 }
3286
3287 void diff_setup_done(struct diff_options *options)
3288 {
3289 int count = 0;
3290
3291 if (options->set_default)
3292 options->set_default(options);
3293
3294 if (options->output_format & DIFF_FORMAT_NAME)
3295 count++;
3296 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3297 count++;
3298 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3299 count++;
3300 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3301 count++;
3302 if (count > 1)
3303 die("--name-only, --name-status, --check and -s are mutually exclusive");
3304
3305 /*
3306 * Most of the time we can say "there are changes"
3307 * only by checking if there are changed paths, but
3308 * --ignore-whitespace* options force us to look
3309 * inside contents.
3310 */
3311
3312 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3313 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3314 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3315 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3316 else
3317 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3318
3319 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3320 options->detect_rename = DIFF_DETECT_COPY;
3321
3322 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3323 options->prefix = NULL;
3324 if (options->prefix)
3325 options->prefix_length = strlen(options->prefix);
3326 else
3327 options->prefix_length = 0;
3328
3329 if (options->output_format & (DIFF_FORMAT_NAME |
3330 DIFF_FORMAT_NAME_STATUS |
3331 DIFF_FORMAT_CHECKDIFF |
3332 DIFF_FORMAT_NO_OUTPUT))
3333 options->output_format &= ~(DIFF_FORMAT_RAW |
3334 DIFF_FORMAT_NUMSTAT |
3335 DIFF_FORMAT_DIFFSTAT |
3336 DIFF_FORMAT_SHORTSTAT |
3337 DIFF_FORMAT_DIRSTAT |
3338 DIFF_FORMAT_SUMMARY |
3339 DIFF_FORMAT_PATCH);
3340
3341 /*
3342 * These cases always need recursive; we do not drop caller-supplied
3343 * recursive bits for other formats here.
3344 */
3345 if (options->output_format & (DIFF_FORMAT_PATCH |
3346 DIFF_FORMAT_NUMSTAT |
3347 DIFF_FORMAT_DIFFSTAT |
3348 DIFF_FORMAT_SHORTSTAT |
3349 DIFF_FORMAT_DIRSTAT |
3350 DIFF_FORMAT_SUMMARY |
3351 DIFF_FORMAT_CHECKDIFF))
3352 DIFF_OPT_SET(options, RECURSIVE);
3353 /*
3354 * Also pickaxe would not work very well if you do not say recursive
3355 */
3356 if (options->pickaxe)
3357 DIFF_OPT_SET(options, RECURSIVE);
3358 /*
3359 * When patches are generated, submodules diffed against the work tree
3360 * must be checked for dirtiness too so it can be shown in the output
3361 */
3362 if (options->output_format & DIFF_FORMAT_PATCH)
3363 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3364
3365 if (options->detect_rename && options->rename_limit < 0)
3366 options->rename_limit = diff_rename_limit_default;
3367 if (options->setup & DIFF_SETUP_USE_CACHE) {
3368 if (!active_cache)
3369 /* read-cache does not die even when it fails
3370 * so it is safe for us to do this here. Also
3371 * it does not smudge active_cache or active_nr
3372 * when it fails, so we do not have to worry about
3373 * cleaning it up ourselves either.
3374 */
3375 read_cache();
3376 }
3377 if (options->abbrev <= 0 || 40 < options->abbrev)
3378 options->abbrev = 40; /* full */
3379
3380 /*
3381 * It does not make sense to show the first hit we happened
3382 * to have found. It does not make sense not to return with
3383 * exit code in such a case either.
3384 */
3385 if (DIFF_OPT_TST(options, QUICK)) {
3386 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3387 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3388 }
3389
3390 options->diff_path_counter = 0;
3391
3392 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3393 die(_("--follow requires exactly one pathspec"));
3394 }
3395
3396 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3397 {
3398 char c, *eq;
3399 int len;
3400
3401 if (*arg != '-')
3402 return 0;
3403 c = *++arg;
3404 if (!c)
3405 return 0;
3406 if (c == arg_short) {
3407 c = *++arg;
3408 if (!c)
3409 return 1;
3410 if (val && isdigit(c)) {
3411 char *end;
3412 int n = strtoul(arg, &end, 10);
3413 if (*end)
3414 return 0;
3415 *val = n;
3416 return 1;
3417 }
3418 return 0;
3419 }
3420 if (c != '-')
3421 return 0;
3422 arg++;
3423 eq = strchrnul(arg, '=');
3424 len = eq - arg;
3425 if (!len || strncmp(arg, arg_long, len))
3426 return 0;
3427 if (*eq) {
3428 int n;
3429 char *end;
3430 if (!isdigit(*++eq))
3431 return 0;
3432 n = strtoul(eq, &end, 10);
3433 if (*end)
3434 return 0;
3435 *val = n;
3436 }
3437 return 1;
3438 }
3439
3440 static int diff_scoreopt_parse(const char *opt);
3441
3442 static inline int short_opt(char opt, const char **argv,
3443 const char **optarg)
3444 {
3445 const char *arg = argv[0];
3446 if (arg[0] != '-' || arg[1] != opt)
3447 return 0;
3448 if (arg[2] != '\0') {
3449 *optarg = arg + 2;
3450 return 1;
3451 }
3452 if (!argv[1])
3453 die("Option '%c' requires a value", opt);
3454 *optarg = argv[1];
3455 return 2;
3456 }
3457
3458 int parse_long_opt(const char *opt, const char **argv,
3459 const char **optarg)
3460 {
3461 const char *arg = argv[0];
3462 if (!skip_prefix(arg, "--", &arg))
3463 return 0;
3464 if (!skip_prefix(arg, opt, &arg))
3465 return 0;
3466 if (*arg == '=') { /* stuck form: --option=value */
3467 *optarg = arg + 1;
3468 return 1;
3469 }
3470 if (*arg != '\0')
3471 return 0;
3472 /* separate form: --option value */
3473 if (!argv[1])
3474 die("Option '--%s' requires a value", opt);
3475 *optarg = argv[1];
3476 return 2;
3477 }
3478
3479 static int stat_opt(struct diff_options *options, const char **av)
3480 {
3481 const char *arg = av[0];
3482 char *end;
3483 int width = options->stat_width;
3484 int name_width = options->stat_name_width;
3485 int graph_width = options->stat_graph_width;
3486 int count = options->stat_count;
3487 int argcount = 1;
3488
3489 if (!skip_prefix(arg, "--stat", &arg))
3490 die("BUG: stat option does not begin with --stat: %s", arg);
3491 end = (char *)arg;
3492
3493 switch (*arg) {
3494 case '-':
3495 if (skip_prefix(arg, "-width", &arg)) {
3496 if (*arg == '=')
3497 width = strtoul(arg + 1, &end, 10);
3498 else if (!*arg && !av[1])
3499 die("Option '--stat-width' requires a value");
3500 else if (!*arg) {
3501 width = strtoul(av[1], &end, 10);
3502 argcount = 2;
3503 }
3504 } else if (skip_prefix(arg, "-name-width", &arg)) {
3505 if (*arg == '=')
3506 name_width = strtoul(arg + 1, &end, 10);
3507 else if (!*arg && !av[1])
3508 die("Option '--stat-name-width' requires a value");
3509 else if (!*arg) {
3510 name_width = strtoul(av[1], &end, 10);
3511 argcount = 2;
3512 }
3513 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3514 if (*arg == '=')
3515 graph_width = strtoul(arg + 1, &end, 10);
3516 else if (!*arg && !av[1])
3517 die("Option '--stat-graph-width' requires a value");
3518 else if (!*arg) {
3519 graph_width = strtoul(av[1], &end, 10);
3520 argcount = 2;
3521 }
3522 } else if (skip_prefix(arg, "-count", &arg)) {
3523 if (*arg == '=')
3524 count = strtoul(arg + 1, &end, 10);
3525 else if (!*arg && !av[1])
3526 die("Option '--stat-count' requires a value");
3527 else if (!*arg) {
3528 count = strtoul(av[1], &end, 10);
3529 argcount = 2;
3530 }
3531 }
3532 break;
3533 case '=':
3534 width = strtoul(arg+1, &end, 10);
3535 if (*end == ',')
3536 name_width = strtoul(end+1, &end, 10);
3537 if (*end == ',')
3538 count = strtoul(end+1, &end, 10);
3539 }
3540
3541 /* Important! This checks all the error cases! */
3542 if (*end)
3543 return 0;
3544 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3545 options->stat_name_width = name_width;
3546 options->stat_graph_width = graph_width;
3547 options->stat_width = width;
3548 options->stat_count = count;
3549 return argcount;
3550 }
3551
3552 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3553 {
3554 struct strbuf errmsg = STRBUF_INIT;
3555 if (parse_dirstat_params(options, params, &errmsg))
3556 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3557 errmsg.buf);
3558 strbuf_release(&errmsg);
3559 /*
3560 * The caller knows a dirstat-related option is given from the command
3561 * line; allow it to say "return this_function();"
3562 */
3563 options->output_format |= DIFF_FORMAT_DIRSTAT;
3564 return 1;
3565 }
3566
3567 static int parse_submodule_opt(struct diff_options *options, const char *value)
3568 {
3569 if (parse_submodule_params(options, value))
3570 die(_("Failed to parse --submodule option parameter: '%s'"),
3571 value);
3572 return 1;
3573 }
3574
3575 static const char diff_status_letters[] = {
3576 DIFF_STATUS_ADDED,
3577 DIFF_STATUS_COPIED,
3578 DIFF_STATUS_DELETED,
3579 DIFF_STATUS_MODIFIED,
3580 DIFF_STATUS_RENAMED,
3581 DIFF_STATUS_TYPE_CHANGED,
3582 DIFF_STATUS_UNKNOWN,
3583 DIFF_STATUS_UNMERGED,
3584 DIFF_STATUS_FILTER_AON,
3585 DIFF_STATUS_FILTER_BROKEN,
3586 '\0',
3587 };
3588
3589 static unsigned int filter_bit['Z' + 1];
3590
3591 static void prepare_filter_bits(void)
3592 {
3593 int i;
3594
3595 if (!filter_bit[DIFF_STATUS_ADDED]) {
3596 for (i = 0; diff_status_letters[i]; i++)
3597 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3598 }
3599 }
3600
3601 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3602 {
3603 return opt->filter & filter_bit[(int) status];
3604 }
3605
3606 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3607 {
3608 int i, optch;
3609
3610 prepare_filter_bits();
3611
3612 /*
3613 * If there is a negation e.g. 'd' in the input, and we haven't
3614 * initialized the filter field with another --diff-filter, start
3615 * from full set of bits, except for AON.
3616 */
3617 if (!opt->filter) {
3618 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3619 if (optch < 'a' || 'z' < optch)
3620 continue;
3621 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3622 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3623 break;
3624 }
3625 }
3626
3627 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3628 unsigned int bit;
3629 int negate;
3630
3631 if ('a' <= optch && optch <= 'z') {
3632 negate = 1;
3633 optch = toupper(optch);
3634 } else {
3635 negate = 0;
3636 }
3637
3638 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3639 if (!bit)
3640 return optarg[i];
3641 if (negate)
3642 opt->filter &= ~bit;
3643 else
3644 opt->filter |= bit;
3645 }
3646 return 0;
3647 }
3648
3649 static void enable_patch_output(int *fmt) {
3650 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3651 *fmt |= DIFF_FORMAT_PATCH;
3652 }
3653
3654 static int parse_one_token(const char **arg, const char *token)
3655 {
3656 const char *rest;
3657 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3658 *arg = rest;
3659 return 1;
3660 }
3661 return 0;
3662 }
3663
3664 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3665 {
3666 const char *orig_arg = arg;
3667 unsigned val = 0;
3668 while (*arg) {
3669 if (parse_one_token(&arg, "none"))
3670 val = 0;
3671 else if (parse_one_token(&arg, "default"))
3672 val = WSEH_NEW;
3673 else if (parse_one_token(&arg, "all"))
3674 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3675 else if (parse_one_token(&arg, "new"))
3676 val |= WSEH_NEW;
3677 else if (parse_one_token(&arg, "old"))
3678 val |= WSEH_OLD;
3679 else if (parse_one_token(&arg, "context"))
3680 val |= WSEH_CONTEXT;
3681 else {
3682 error("unknown value after ws-error-highlight=%.*s",
3683 (int)(arg - orig_arg), orig_arg);
3684 return 0;
3685 }
3686 if (*arg)
3687 arg++;
3688 }
3689 opt->ws_error_highlight = val;
3690 return 1;
3691 }
3692
3693 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3694 {
3695 const char *arg = av[0];
3696 const char *optarg;
3697 int argcount;
3698
3699 /* Output format options */
3700 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3701 || opt_arg(arg, 'U', "unified", &options->context))
3702 enable_patch_output(&options->output_format);
3703 else if (!strcmp(arg, "--raw"))
3704 options->output_format |= DIFF_FORMAT_RAW;
3705 else if (!strcmp(arg, "--patch-with-raw")) {
3706 enable_patch_output(&options->output_format);
3707 options->output_format |= DIFF_FORMAT_RAW;
3708 } else if (!strcmp(arg, "--numstat"))
3709 options->output_format |= DIFF_FORMAT_NUMSTAT;
3710 else if (!strcmp(arg, "--shortstat"))
3711 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3712 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3713 return parse_dirstat_opt(options, "");
3714 else if (skip_prefix(arg, "-X", &arg))
3715 return parse_dirstat_opt(options, arg);
3716 else if (skip_prefix(arg, "--dirstat=", &arg))
3717 return parse_dirstat_opt(options, arg);
3718 else if (!strcmp(arg, "--cumulative"))
3719 return parse_dirstat_opt(options, "cumulative");
3720 else if (!strcmp(arg, "--dirstat-by-file"))
3721 return parse_dirstat_opt(options, "files");
3722 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3723 parse_dirstat_opt(options, "files");
3724 return parse_dirstat_opt(options, arg);
3725 }
3726 else if (!strcmp(arg, "--check"))
3727 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3728 else if (!strcmp(arg, "--summary"))
3729 options->output_format |= DIFF_FORMAT_SUMMARY;
3730 else if (!strcmp(arg, "--patch-with-stat")) {
3731 enable_patch_output(&options->output_format);
3732 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3733 } else if (!strcmp(arg, "--name-only"))
3734 options->output_format |= DIFF_FORMAT_NAME;
3735 else if (!strcmp(arg, "--name-status"))
3736 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3737 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3738 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3739 else if (starts_with(arg, "--stat"))
3740 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3741 return stat_opt(options, av);
3742
3743 /* renames options */
3744 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3745 !strcmp(arg, "--break-rewrites")) {
3746 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3747 return error("invalid argument to -B: %s", arg+2);
3748 }
3749 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3750 !strcmp(arg, "--find-renames")) {
3751 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3752 return error("invalid argument to -M: %s", arg+2);
3753 options->detect_rename = DIFF_DETECT_RENAME;
3754 }
3755 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3756 options->irreversible_delete = 1;
3757 }
3758 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3759 !strcmp(arg, "--find-copies")) {
3760 if (options->detect_rename == DIFF_DETECT_COPY)
3761 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3762 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3763 return error("invalid argument to -C: %s", arg+2);
3764 options->detect_rename = DIFF_DETECT_COPY;
3765 }
3766 else if (!strcmp(arg, "--no-renames"))
3767 options->detect_rename = 0;
3768 else if (!strcmp(arg, "--rename-empty"))
3769 DIFF_OPT_SET(options, RENAME_EMPTY);
3770 else if (!strcmp(arg, "--no-rename-empty"))
3771 DIFF_OPT_CLR(options, RENAME_EMPTY);
3772 else if (!strcmp(arg, "--relative"))
3773 DIFF_OPT_SET(options, RELATIVE_NAME);
3774 else if (skip_prefix(arg, "--relative=", &arg)) {
3775 DIFF_OPT_SET(options, RELATIVE_NAME);
3776 options->prefix = arg;
3777 }
3778
3779 /* xdiff options */
3780 else if (!strcmp(arg, "--minimal"))
3781 DIFF_XDL_SET(options, NEED_MINIMAL);
3782 else if (!strcmp(arg, "--no-minimal"))
3783 DIFF_XDL_CLR(options, NEED_MINIMAL);
3784 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3785 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3786 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3787 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3788 else if (!strcmp(arg, "--ignore-space-at-eol"))
3789 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3790 else if (!strcmp(arg, "--ignore-blank-lines"))
3791 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3792 else if (!strcmp(arg, "--patience"))
3793 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3794 else if (!strcmp(arg, "--histogram"))
3795 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3796 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3797 long value = parse_algorithm_value(optarg);
3798 if (value < 0)
3799 return error("option diff-algorithm accepts \"myers\", "
3800 "\"minimal\", \"patience\" and \"histogram\"");
3801 /* clear out previous settings */
3802 DIFF_XDL_CLR(options, NEED_MINIMAL);
3803 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3804 options->xdl_opts |= value;
3805 return argcount;
3806 }
3807
3808 /* flags options */
3809 else if (!strcmp(arg, "--binary")) {
3810 enable_patch_output(&options->output_format);
3811 DIFF_OPT_SET(options, BINARY);
3812 }
3813 else if (!strcmp(arg, "--full-index"))
3814 DIFF_OPT_SET(options, FULL_INDEX);
3815 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3816 DIFF_OPT_SET(options, TEXT);
3817 else if (!strcmp(arg, "-R"))
3818 DIFF_OPT_SET(options, REVERSE_DIFF);
3819 else if (!strcmp(arg, "--find-copies-harder"))
3820 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3821 else if (!strcmp(arg, "--follow"))
3822 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3823 else if (!strcmp(arg, "--no-follow")) {
3824 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3825 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3826 } else if (!strcmp(arg, "--color"))
3827 options->use_color = 1;
3828 else if (skip_prefix(arg, "--color=", &arg)) {
3829 int value = git_config_colorbool(NULL, arg);
3830 if (value < 0)
3831 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3832 options->use_color = value;
3833 }
3834 else if (!strcmp(arg, "--no-color"))
3835 options->use_color = 0;
3836 else if (!strcmp(arg, "--color-words")) {
3837 options->use_color = 1;
3838 options->word_diff = DIFF_WORDS_COLOR;
3839 }
3840 else if (skip_prefix(arg, "--color-words=", &arg)) {
3841 options->use_color = 1;
3842 options->word_diff = DIFF_WORDS_COLOR;
3843 options->word_regex = arg;
3844 }
3845 else if (!strcmp(arg, "--word-diff")) {
3846 if (options->word_diff == DIFF_WORDS_NONE)
3847 options->word_diff = DIFF_WORDS_PLAIN;
3848 }
3849 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3850 if (!strcmp(arg, "plain"))
3851 options->word_diff = DIFF_WORDS_PLAIN;
3852 else if (!strcmp(arg, "color")) {
3853 options->use_color = 1;
3854 options->word_diff = DIFF_WORDS_COLOR;
3855 }
3856 else if (!strcmp(arg, "porcelain"))
3857 options->word_diff = DIFF_WORDS_PORCELAIN;
3858 else if (!strcmp(arg, "none"))
3859 options->word_diff = DIFF_WORDS_NONE;
3860 else
3861 die("bad --word-diff argument: %s", arg);
3862 }
3863 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3864 if (options->word_diff == DIFF_WORDS_NONE)
3865 options->word_diff = DIFF_WORDS_PLAIN;
3866 options->word_regex = optarg;
3867 return argcount;
3868 }
3869 else if (!strcmp(arg, "--exit-code"))
3870 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3871 else if (!strcmp(arg, "--quiet"))
3872 DIFF_OPT_SET(options, QUICK);
3873 else if (!strcmp(arg, "--ext-diff"))
3874 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3875 else if (!strcmp(arg, "--no-ext-diff"))
3876 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3877 else if (!strcmp(arg, "--textconv"))
3878 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3879 else if (!strcmp(arg, "--no-textconv"))
3880 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3881 else if (!strcmp(arg, "--ignore-submodules")) {
3882 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3883 handle_ignore_submodules_arg(options, "all");
3884 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3885 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3886 handle_ignore_submodules_arg(options, arg);
3887 } else if (!strcmp(arg, "--submodule"))
3888 DIFF_OPT_SET(options, SUBMODULE_LOG);
3889 else if (skip_prefix(arg, "--submodule=", &arg))
3890 return parse_submodule_opt(options, arg);
3891 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3892 return parse_ws_error_highlight(options, arg);
3893
3894 /* misc options */
3895 else if (!strcmp(arg, "-z"))
3896 options->line_termination = 0;
3897 else if ((argcount = short_opt('l', av, &optarg))) {
3898 options->rename_limit = strtoul(optarg, NULL, 10);
3899 return argcount;
3900 }
3901 else if ((argcount = short_opt('S', av, &optarg))) {
3902 options->pickaxe = optarg;
3903 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3904 return argcount;
3905 } else if ((argcount = short_opt('G', av, &optarg))) {
3906 options->pickaxe = optarg;
3907 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3908 return argcount;
3909 }
3910 else if (!strcmp(arg, "--pickaxe-all"))
3911 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3912 else if (!strcmp(arg, "--pickaxe-regex"))
3913 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3914 else if ((argcount = short_opt('O', av, &optarg))) {
3915 options->orderfile = optarg;
3916 return argcount;
3917 }
3918 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3919 int offending = parse_diff_filter_opt(optarg, options);
3920 if (offending)
3921 die("unknown change class '%c' in --diff-filter=%s",
3922 offending, optarg);
3923 return argcount;
3924 }
3925 else if (!strcmp(arg, "--abbrev"))
3926 options->abbrev = DEFAULT_ABBREV;
3927 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3928 options->abbrev = strtoul(arg, NULL, 10);
3929 if (options->abbrev < MINIMUM_ABBREV)
3930 options->abbrev = MINIMUM_ABBREV;
3931 else if (40 < options->abbrev)
3932 options->abbrev = 40;
3933 }
3934 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3935 options->a_prefix = optarg;
3936 return argcount;
3937 }
3938 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3939 options->b_prefix = optarg;
3940 return argcount;
3941 }
3942 else if (!strcmp(arg, "--no-prefix"))
3943 options->a_prefix = options->b_prefix = "";
3944 else if (opt_arg(arg, '\0', "inter-hunk-context",
3945 &options->interhunkcontext))
3946 ;
3947 else if (!strcmp(arg, "-W"))
3948 DIFF_OPT_SET(options, FUNCCONTEXT);
3949 else if (!strcmp(arg, "--function-context"))
3950 DIFF_OPT_SET(options, FUNCCONTEXT);
3951 else if (!strcmp(arg, "--no-function-context"))
3952 DIFF_OPT_CLR(options, FUNCCONTEXT);
3953 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3954 options->file = fopen(optarg, "w");
3955 if (!options->file)
3956 die_errno("Could not open '%s'", optarg);
3957 options->close_file = 1;
3958 return argcount;
3959 } else
3960 return 0;
3961 return 1;
3962 }
3963
3964 int parse_rename_score(const char **cp_p)
3965 {
3966 unsigned long num, scale;
3967 int ch, dot;
3968 const char *cp = *cp_p;
3969
3970 num = 0;
3971 scale = 1;
3972 dot = 0;
3973 for (;;) {
3974 ch = *cp;
3975 if ( !dot && ch == '.' ) {
3976 scale = 1;
3977 dot = 1;
3978 } else if ( ch == '%' ) {
3979 scale = dot ? scale*100 : 100;
3980 cp++; /* % is always at the end */
3981 break;
3982 } else if ( ch >= '0' && ch <= '9' ) {
3983 if ( scale < 100000 ) {
3984 scale *= 10;
3985 num = (num*10) + (ch-'0');
3986 }
3987 } else {
3988 break;
3989 }
3990 cp++;
3991 }
3992 *cp_p = cp;
3993
3994 /* user says num divided by scale and we say internally that
3995 * is MAX_SCORE * num / scale.
3996 */
3997 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3998 }
3999
4000 static int diff_scoreopt_parse(const char *opt)
4001 {
4002 int opt1, opt2, cmd;
4003
4004 if (*opt++ != '-')
4005 return -1;
4006 cmd = *opt++;
4007 if (cmd == '-') {
4008 /* convert the long-form arguments into short-form versions */
4009 if (skip_prefix(opt, "break-rewrites", &opt)) {
4010 if (*opt == 0 || *opt++ == '=')
4011 cmd = 'B';
4012 } else if (skip_prefix(opt, "find-copies", &opt)) {
4013 if (*opt == 0 || *opt++ == '=')
4014 cmd = 'C';
4015 } else if (skip_prefix(opt, "find-renames", &opt)) {
4016 if (*opt == 0 || *opt++ == '=')
4017 cmd = 'M';
4018 }
4019 }
4020 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4021 return -1; /* that is not a -M, -C, or -B option */
4022
4023 opt1 = parse_rename_score(&opt);
4024 if (cmd != 'B')
4025 opt2 = 0;
4026 else {
4027 if (*opt == 0)
4028 opt2 = 0;
4029 else if (*opt != '/')
4030 return -1; /* we expect -B80/99 or -B80 */
4031 else {
4032 opt++;
4033 opt2 = parse_rename_score(&opt);
4034 }
4035 }
4036 if (*opt != 0)
4037 return -1;
4038 return opt1 | (opt2 << 16);
4039 }
4040
4041 struct diff_queue_struct diff_queued_diff;
4042
4043 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4044 {
4045 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4046 queue->queue[queue->nr++] = dp;
4047 }
4048
4049 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4050 struct diff_filespec *one,
4051 struct diff_filespec *two)
4052 {
4053 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4054 dp->one = one;
4055 dp->two = two;
4056 if (queue)
4057 diff_q(queue, dp);
4058 return dp;
4059 }
4060
4061 void diff_free_filepair(struct diff_filepair *p)
4062 {
4063 free_filespec(p->one);
4064 free_filespec(p->two);
4065 free(p);
4066 }
4067
4068 /* This is different from find_unique_abbrev() in that
4069 * it stuffs the result with dots for alignment.
4070 */
4071 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4072 {
4073 int abblen;
4074 const char *abbrev;
4075 if (len == 40)
4076 return sha1_to_hex(sha1);
4077
4078 abbrev = find_unique_abbrev(sha1, len);
4079 abblen = strlen(abbrev);
4080 if (abblen < 37) {
4081 static char hex[41];
4082 if (len < abblen && abblen <= len + 2)
4083 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
4084 else
4085 sprintf(hex, "%s...", abbrev);
4086 return hex;
4087 }
4088 return sha1_to_hex(sha1);
4089 }
4090
4091 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4092 {
4093 int line_termination = opt->line_termination;
4094 int inter_name_termination = line_termination ? '\t' : '\0';
4095
4096 fprintf(opt->file, "%s", diff_line_prefix(opt));
4097 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4098 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4099 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4100 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4101 }
4102 if (p->score) {
4103 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4104 inter_name_termination);
4105 } else {
4106 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4107 }
4108
4109 if (p->status == DIFF_STATUS_COPIED ||
4110 p->status == DIFF_STATUS_RENAMED) {
4111 const char *name_a, *name_b;
4112 name_a = p->one->path;
4113 name_b = p->two->path;
4114 strip_prefix(opt->prefix_length, &name_a, &name_b);
4115 write_name_quoted(name_a, opt->file, inter_name_termination);
4116 write_name_quoted(name_b, opt->file, line_termination);
4117 } else {
4118 const char *name_a, *name_b;
4119 name_a = p->one->mode ? p->one->path : p->two->path;
4120 name_b = NULL;
4121 strip_prefix(opt->prefix_length, &name_a, &name_b);
4122 write_name_quoted(name_a, opt->file, line_termination);
4123 }
4124 }
4125
4126 int diff_unmodified_pair(struct diff_filepair *p)
4127 {
4128 /* This function is written stricter than necessary to support
4129 * the currently implemented transformers, but the idea is to
4130 * let transformers to produce diff_filepairs any way they want,
4131 * and filter and clean them up here before producing the output.
4132 */
4133 struct diff_filespec *one = p->one, *two = p->two;
4134
4135 if (DIFF_PAIR_UNMERGED(p))
4136 return 0; /* unmerged is interesting */
4137
4138 /* deletion, addition, mode or type change
4139 * and rename are all interesting.
4140 */
4141 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4142 DIFF_PAIR_MODE_CHANGED(p) ||
4143 strcmp(one->path, two->path))
4144 return 0;
4145
4146 /* both are valid and point at the same path. that is, we are
4147 * dealing with a change.
4148 */
4149 if (one->sha1_valid && two->sha1_valid &&
4150 !hashcmp(one->sha1, two->sha1) &&
4151 !one->dirty_submodule && !two->dirty_submodule)
4152 return 1; /* no change */
4153 if (!one->sha1_valid && !two->sha1_valid)
4154 return 1; /* both look at the same file on the filesystem. */
4155 return 0;
4156 }
4157
4158 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4159 {
4160 if (diff_unmodified_pair(p))
4161 return;
4162
4163 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4164 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4165 return; /* no tree diffs in patch format */
4166
4167 run_diff(p, o);
4168 }
4169
4170 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4171 struct diffstat_t *diffstat)
4172 {
4173 if (diff_unmodified_pair(p))
4174 return;
4175
4176 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4177 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4178 return; /* no useful stat for tree diffs */
4179
4180 run_diffstat(p, o, diffstat);
4181 }
4182
4183 static void diff_flush_checkdiff(struct diff_filepair *p,
4184 struct diff_options *o)
4185 {
4186 if (diff_unmodified_pair(p))
4187 return;
4188
4189 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4190 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4191 return; /* nothing to check in tree diffs */
4192
4193 run_checkdiff(p, o);
4194 }
4195
4196 int diff_queue_is_empty(void)
4197 {
4198 struct diff_queue_struct *q = &diff_queued_diff;
4199 int i;
4200 for (i = 0; i < q->nr; i++)
4201 if (!diff_unmodified_pair(q->queue[i]))
4202 return 0;
4203 return 1;
4204 }
4205
4206 #if DIFF_DEBUG
4207 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4208 {
4209 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4210 x, one ? one : "",
4211 s->path,
4212 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4213 s->mode,
4214 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4215 fprintf(stderr, "queue[%d] %s size %lu\n",
4216 x, one ? one : "",
4217 s->size);
4218 }
4219
4220 void diff_debug_filepair(const struct diff_filepair *p, int i)
4221 {
4222 diff_debug_filespec(p->one, i, "one");
4223 diff_debug_filespec(p->two, i, "two");
4224 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4225 p->score, p->status ? p->status : '?',
4226 p->one->rename_used, p->broken_pair);
4227 }
4228
4229 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4230 {
4231 int i;
4232 if (msg)
4233 fprintf(stderr, "%s\n", msg);
4234 fprintf(stderr, "q->nr = %d\n", q->nr);
4235 for (i = 0; i < q->nr; i++) {
4236 struct diff_filepair *p = q->queue[i];
4237 diff_debug_filepair(p, i);
4238 }
4239 }
4240 #endif
4241
4242 static void diff_resolve_rename_copy(void)
4243 {
4244 int i;
4245 struct diff_filepair *p;
4246 struct diff_queue_struct *q = &diff_queued_diff;
4247
4248 diff_debug_queue("resolve-rename-copy", q);
4249
4250 for (i = 0; i < q->nr; i++) {
4251 p = q->queue[i];
4252 p->status = 0; /* undecided */
4253 if (DIFF_PAIR_UNMERGED(p))
4254 p->status = DIFF_STATUS_UNMERGED;
4255 else if (!DIFF_FILE_VALID(p->one))
4256 p->status = DIFF_STATUS_ADDED;
4257 else if (!DIFF_FILE_VALID(p->two))
4258 p->status = DIFF_STATUS_DELETED;
4259 else if (DIFF_PAIR_TYPE_CHANGED(p))
4260 p->status = DIFF_STATUS_TYPE_CHANGED;
4261
4262 /* from this point on, we are dealing with a pair
4263 * whose both sides are valid and of the same type, i.e.
4264 * either in-place edit or rename/copy edit.
4265 */
4266 else if (DIFF_PAIR_RENAME(p)) {
4267 /*
4268 * A rename might have re-connected a broken
4269 * pair up, causing the pathnames to be the
4270 * same again. If so, that's not a rename at
4271 * all, just a modification..
4272 *
4273 * Otherwise, see if this source was used for
4274 * multiple renames, in which case we decrement
4275 * the count, and call it a copy.
4276 */
4277 if (!strcmp(p->one->path, p->two->path))
4278 p->status = DIFF_STATUS_MODIFIED;
4279 else if (--p->one->rename_used > 0)
4280 p->status = DIFF_STATUS_COPIED;
4281 else
4282 p->status = DIFF_STATUS_RENAMED;
4283 }
4284 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4285 p->one->mode != p->two->mode ||
4286 p->one->dirty_submodule ||
4287 p->two->dirty_submodule ||
4288 is_null_sha1(p->one->sha1))
4289 p->status = DIFF_STATUS_MODIFIED;
4290 else {
4291 /* This is a "no-change" entry and should not
4292 * happen anymore, but prepare for broken callers.
4293 */
4294 error("feeding unmodified %s to diffcore",
4295 p->one->path);
4296 p->status = DIFF_STATUS_UNKNOWN;
4297 }
4298 }
4299 diff_debug_queue("resolve-rename-copy done", q);
4300 }
4301
4302 static int check_pair_status(struct diff_filepair *p)
4303 {
4304 switch (p->status) {
4305 case DIFF_STATUS_UNKNOWN:
4306 return 0;
4307 case 0:
4308 die("internal error in diff-resolve-rename-copy");
4309 default:
4310 return 1;
4311 }
4312 }
4313
4314 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4315 {
4316 int fmt = opt->output_format;
4317
4318 if (fmt & DIFF_FORMAT_CHECKDIFF)
4319 diff_flush_checkdiff(p, opt);
4320 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4321 diff_flush_raw(p, opt);
4322 else if (fmt & DIFF_FORMAT_NAME) {
4323 const char *name_a, *name_b;
4324 name_a = p->two->path;
4325 name_b = NULL;
4326 strip_prefix(opt->prefix_length, &name_a, &name_b);
4327 write_name_quoted(name_a, opt->file, opt->line_termination);
4328 }
4329 }
4330
4331 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4332 {
4333 if (fs->mode)
4334 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4335 else
4336 fprintf(file, " %s ", newdelete);
4337 write_name_quoted(fs->path, file, '\n');
4338 }
4339
4340
4341 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4342 const char *line_prefix)
4343 {
4344 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4345 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4346 p->two->mode, show_name ? ' ' : '\n');
4347 if (show_name) {
4348 write_name_quoted(p->two->path, file, '\n');
4349 }
4350 }
4351 }
4352
4353 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4354 const char *line_prefix)
4355 {
4356 char *names = pprint_rename(p->one->path, p->two->path);
4357
4358 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4359 free(names);
4360 show_mode_change(file, p, 0, line_prefix);
4361 }
4362
4363 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4364 {
4365 FILE *file = opt->file;
4366 const char *line_prefix = diff_line_prefix(opt);
4367
4368 switch(p->status) {
4369 case DIFF_STATUS_DELETED:
4370 fputs(line_prefix, file);
4371 show_file_mode_name(file, "delete", p->one);
4372 break;
4373 case DIFF_STATUS_ADDED:
4374 fputs(line_prefix, file);
4375 show_file_mode_name(file, "create", p->two);
4376 break;
4377 case DIFF_STATUS_COPIED:
4378 fputs(line_prefix, file);
4379 show_rename_copy(file, "copy", p, line_prefix);
4380 break;
4381 case DIFF_STATUS_RENAMED:
4382 fputs(line_prefix, file);
4383 show_rename_copy(file, "rename", p, line_prefix);
4384 break;
4385 default:
4386 if (p->score) {
4387 fprintf(file, "%s rewrite ", line_prefix);
4388 write_name_quoted(p->two->path, file, ' ');
4389 fprintf(file, "(%d%%)\n", similarity_index(p));
4390 }
4391 show_mode_change(file, p, !p->score, line_prefix);
4392 break;
4393 }
4394 }
4395
4396 struct patch_id_t {
4397 git_SHA_CTX *ctx;
4398 int patchlen;
4399 };
4400
4401 static int remove_space(char *line, int len)
4402 {
4403 int i;
4404 char *dst = line;
4405 unsigned char c;
4406
4407 for (i = 0; i < len; i++)
4408 if (!isspace((c = line[i])))
4409 *dst++ = c;
4410
4411 return dst - line;
4412 }
4413
4414 static void patch_id_consume(void *priv, char *line, unsigned long len)
4415 {
4416 struct patch_id_t *data = priv;
4417 int new_len;
4418
4419 /* Ignore line numbers when computing the SHA1 of the patch */
4420 if (starts_with(line, "@@ -"))
4421 return;
4422
4423 new_len = remove_space(line, len);
4424
4425 git_SHA1_Update(data->ctx, line, new_len);
4426 data->patchlen += new_len;
4427 }
4428
4429 /* returns 0 upon success, and writes result into sha1 */
4430 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4431 {
4432 struct diff_queue_struct *q = &diff_queued_diff;
4433 int i;
4434 git_SHA_CTX ctx;
4435 struct patch_id_t data;
4436 char buffer[PATH_MAX * 4 + 20];
4437
4438 git_SHA1_Init(&ctx);
4439 memset(&data, 0, sizeof(struct patch_id_t));
4440 data.ctx = &ctx;
4441
4442 for (i = 0; i < q->nr; i++) {
4443 xpparam_t xpp;
4444 xdemitconf_t xecfg;
4445 mmfile_t mf1, mf2;
4446 struct diff_filepair *p = q->queue[i];
4447 int len1, len2;
4448
4449 memset(&xpp, 0, sizeof(xpp));
4450 memset(&xecfg, 0, sizeof(xecfg));
4451 if (p->status == 0)
4452 return error("internal diff status error");
4453 if (p->status == DIFF_STATUS_UNKNOWN)
4454 continue;
4455 if (diff_unmodified_pair(p))
4456 continue;
4457 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4458 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4459 continue;
4460 if (DIFF_PAIR_UNMERGED(p))
4461 continue;
4462
4463 diff_fill_sha1_info(p->one);
4464 diff_fill_sha1_info(p->two);
4465 if (fill_mmfile(&mf1, p->one) < 0 ||
4466 fill_mmfile(&mf2, p->two) < 0)
4467 return error("unable to read files to diff");
4468
4469 len1 = remove_space(p->one->path, strlen(p->one->path));
4470 len2 = remove_space(p->two->path, strlen(p->two->path));
4471 if (p->one->mode == 0)
4472 len1 = snprintf(buffer, sizeof(buffer),
4473 "diff--gita/%.*sb/%.*s"
4474 "newfilemode%06o"
4475 "---/dev/null"
4476 "+++b/%.*s",
4477 len1, p->one->path,
4478 len2, p->two->path,
4479 p->two->mode,
4480 len2, p->two->path);
4481 else if (p->two->mode == 0)
4482 len1 = snprintf(buffer, sizeof(buffer),
4483 "diff--gita/%.*sb/%.*s"
4484 "deletedfilemode%06o"
4485 "---a/%.*s"
4486 "+++/dev/null",
4487 len1, p->one->path,
4488 len2, p->two->path,
4489 p->one->mode,
4490 len1, p->one->path);
4491 else
4492 len1 = snprintf(buffer, sizeof(buffer),
4493 "diff--gita/%.*sb/%.*s"
4494 "---a/%.*s"
4495 "+++b/%.*s",
4496 len1, p->one->path,
4497 len2, p->two->path,
4498 len1, p->one->path,
4499 len2, p->two->path);
4500 git_SHA1_Update(&ctx, buffer, len1);
4501
4502 if (diff_filespec_is_binary(p->one) ||
4503 diff_filespec_is_binary(p->two)) {
4504 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4505 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4506 continue;
4507 }
4508
4509 xpp.flags = 0;
4510 xecfg.ctxlen = 3;
4511 xecfg.flags = 0;
4512 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4513 &xpp, &xecfg);
4514 }
4515
4516 git_SHA1_Final(sha1, &ctx);
4517 return 0;
4518 }
4519
4520 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4521 {
4522 struct diff_queue_struct *q = &diff_queued_diff;
4523 int i;
4524 int result = diff_get_patch_id(options, sha1);
4525
4526 for (i = 0; i < q->nr; i++)
4527 diff_free_filepair(q->queue[i]);
4528
4529 free(q->queue);
4530 DIFF_QUEUE_CLEAR(q);
4531
4532 return result;
4533 }
4534
4535 static int is_summary_empty(const struct diff_queue_struct *q)
4536 {
4537 int i;
4538
4539 for (i = 0; i < q->nr; i++) {
4540 const struct diff_filepair *p = q->queue[i];
4541
4542 switch (p->status) {
4543 case DIFF_STATUS_DELETED:
4544 case DIFF_STATUS_ADDED:
4545 case DIFF_STATUS_COPIED:
4546 case DIFF_STATUS_RENAMED:
4547 return 0;
4548 default:
4549 if (p->score)
4550 return 0;
4551 if (p->one->mode && p->two->mode &&
4552 p->one->mode != p->two->mode)
4553 return 0;
4554 break;
4555 }
4556 }
4557 return 1;
4558 }
4559
4560 static const char rename_limit_warning[] =
4561 "inexact rename detection was skipped due to too many files.";
4562
4563 static const char degrade_cc_to_c_warning[] =
4564 "only found copies from modified paths due to too many files.";
4565
4566 static const char rename_limit_advice[] =
4567 "you may want to set your %s variable to at least "
4568 "%d and retry the command.";
4569
4570 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4571 {
4572 if (degraded_cc)
4573 warning(degrade_cc_to_c_warning);
4574 else if (needed)
4575 warning(rename_limit_warning);
4576 else
4577 return;
4578 if (0 < needed && needed < 32767)
4579 warning(rename_limit_advice, varname, needed);
4580 }
4581
4582 void diff_flush(struct diff_options *options)
4583 {
4584 struct diff_queue_struct *q = &diff_queued_diff;
4585 int i, output_format = options->output_format;
4586 int separator = 0;
4587 int dirstat_by_line = 0;
4588
4589 /*
4590 * Order: raw, stat, summary, patch
4591 * or: name/name-status/checkdiff (other bits clear)
4592 */
4593 if (!q->nr)
4594 goto free_queue;
4595
4596 if (output_format & (DIFF_FORMAT_RAW |
4597 DIFF_FORMAT_NAME |
4598 DIFF_FORMAT_NAME_STATUS |
4599 DIFF_FORMAT_CHECKDIFF)) {
4600 for (i = 0; i < q->nr; i++) {
4601 struct diff_filepair *p = q->queue[i];
4602 if (check_pair_status(p))
4603 flush_one_pair(p, options);
4604 }
4605 separator++;
4606 }
4607
4608 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4609 dirstat_by_line = 1;
4610
4611 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4612 dirstat_by_line) {
4613 struct diffstat_t diffstat;
4614
4615 memset(&diffstat, 0, sizeof(struct diffstat_t));
4616 for (i = 0; i < q->nr; i++) {
4617 struct diff_filepair *p = q->queue[i];
4618 if (check_pair_status(p))
4619 diff_flush_stat(p, options, &diffstat);
4620 }
4621 if (output_format & DIFF_FORMAT_NUMSTAT)
4622 show_numstat(&diffstat, options);
4623 if (output_format & DIFF_FORMAT_DIFFSTAT)
4624 show_stats(&diffstat, options);
4625 if (output_format & DIFF_FORMAT_SHORTSTAT)
4626 show_shortstats(&diffstat, options);
4627 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4628 show_dirstat_by_line(&diffstat, options);
4629 free_diffstat_info(&diffstat);
4630 separator++;
4631 }
4632 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4633 show_dirstat(options);
4634
4635 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4636 for (i = 0; i < q->nr; i++) {
4637 diff_summary(options, q->queue[i]);
4638 }
4639 separator++;
4640 }
4641
4642 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4643 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4644 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4645 /*
4646 * run diff_flush_patch for the exit status. setting
4647 * options->file to /dev/null should be safe, because we
4648 * aren't supposed to produce any output anyway.
4649 */
4650 if (options->close_file)
4651 fclose(options->file);
4652 options->file = fopen("/dev/null", "w");
4653 if (!options->file)
4654 die_errno("Could not open /dev/null");
4655 options->close_file = 1;
4656 for (i = 0; i < q->nr; i++) {
4657 struct diff_filepair *p = q->queue[i];
4658 if (check_pair_status(p))
4659 diff_flush_patch(p, options);
4660 if (options->found_changes)
4661 break;
4662 }
4663 }
4664
4665 if (output_format & DIFF_FORMAT_PATCH) {
4666 if (separator) {
4667 fprintf(options->file, "%s%c",
4668 diff_line_prefix(options),
4669 options->line_termination);
4670 if (options->stat_sep) {
4671 /* attach patch instead of inline */
4672 fputs(options->stat_sep, options->file);
4673 }
4674 }
4675
4676 for (i = 0; i < q->nr; i++) {
4677 struct diff_filepair *p = q->queue[i];
4678 if (check_pair_status(p))
4679 diff_flush_patch(p, options);
4680 }
4681 }
4682
4683 if (output_format & DIFF_FORMAT_CALLBACK)
4684 options->format_callback(q, options, options->format_callback_data);
4685
4686 for (i = 0; i < q->nr; i++)
4687 diff_free_filepair(q->queue[i]);
4688 free_queue:
4689 free(q->queue);
4690 DIFF_QUEUE_CLEAR(q);
4691 if (options->close_file)
4692 fclose(options->file);
4693
4694 /*
4695 * Report the content-level differences with HAS_CHANGES;
4696 * diff_addremove/diff_change does not set the bit when
4697 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4698 */
4699 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4700 if (options->found_changes)
4701 DIFF_OPT_SET(options, HAS_CHANGES);
4702 else
4703 DIFF_OPT_CLR(options, HAS_CHANGES);
4704 }
4705 }
4706
4707 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4708 {
4709 return (((p->status == DIFF_STATUS_MODIFIED) &&
4710 ((p->score &&
4711 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4712 (!p->score &&
4713 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4714 ((p->status != DIFF_STATUS_MODIFIED) &&
4715 filter_bit_tst(p->status, options)));
4716 }
4717
4718 static void diffcore_apply_filter(struct diff_options *options)
4719 {
4720 int i;
4721 struct diff_queue_struct *q = &diff_queued_diff;
4722 struct diff_queue_struct outq;
4723
4724 DIFF_QUEUE_CLEAR(&outq);
4725
4726 if (!options->filter)
4727 return;
4728
4729 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4730 int found;
4731 for (i = found = 0; !found && i < q->nr; i++) {
4732 if (match_filter(options, q->queue[i]))
4733 found++;
4734 }
4735 if (found)
4736 return;
4737
4738 /* otherwise we will clear the whole queue
4739 * by copying the empty outq at the end of this
4740 * function, but first clear the current entries
4741 * in the queue.
4742 */
4743 for (i = 0; i < q->nr; i++)
4744 diff_free_filepair(q->queue[i]);
4745 }
4746 else {
4747 /* Only the matching ones */
4748 for (i = 0; i < q->nr; i++) {
4749 struct diff_filepair *p = q->queue[i];
4750 if (match_filter(options, p))
4751 diff_q(&outq, p);
4752 else
4753 diff_free_filepair(p);
4754 }
4755 }
4756 free(q->queue);
4757 *q = outq;
4758 }
4759
4760 /* Check whether two filespecs with the same mode and size are identical */
4761 static int diff_filespec_is_identical(struct diff_filespec *one,
4762 struct diff_filespec *two)
4763 {
4764 if (S_ISGITLINK(one->mode))
4765 return 0;
4766 if (diff_populate_filespec(one, 0))
4767 return 0;
4768 if (diff_populate_filespec(two, 0))
4769 return 0;
4770 return !memcmp(one->data, two->data, one->size);
4771 }
4772
4773 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4774 {
4775 if (p->done_skip_stat_unmatch)
4776 return p->skip_stat_unmatch_result;
4777
4778 p->done_skip_stat_unmatch = 1;
4779 p->skip_stat_unmatch_result = 0;
4780 /*
4781 * 1. Entries that come from stat info dirtiness
4782 * always have both sides (iow, not create/delete),
4783 * one side of the object name is unknown, with
4784 * the same mode and size. Keep the ones that
4785 * do not match these criteria. They have real
4786 * differences.
4787 *
4788 * 2. At this point, the file is known to be modified,
4789 * with the same mode and size, and the object
4790 * name of one side is unknown. Need to inspect
4791 * the identical contents.
4792 */
4793 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4794 !DIFF_FILE_VALID(p->two) ||
4795 (p->one->sha1_valid && p->two->sha1_valid) ||
4796 (p->one->mode != p->two->mode) ||
4797 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4798 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4799 (p->one->size != p->two->size) ||
4800 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4801 p->skip_stat_unmatch_result = 1;
4802 return p->skip_stat_unmatch_result;
4803 }
4804
4805 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4806 {
4807 int i;
4808 struct diff_queue_struct *q = &diff_queued_diff;
4809 struct diff_queue_struct outq;
4810 DIFF_QUEUE_CLEAR(&outq);
4811
4812 for (i = 0; i < q->nr; i++) {
4813 struct diff_filepair *p = q->queue[i];
4814
4815 if (diff_filespec_check_stat_unmatch(p))
4816 diff_q(&outq, p);
4817 else {
4818 /*
4819 * The caller can subtract 1 from skip_stat_unmatch
4820 * to determine how many paths were dirty only
4821 * due to stat info mismatch.
4822 */
4823 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4824 diffopt->skip_stat_unmatch++;
4825 diff_free_filepair(p);
4826 }
4827 }
4828 free(q->queue);
4829 *q = outq;
4830 }
4831
4832 static int diffnamecmp(const void *a_, const void *b_)
4833 {
4834 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4835 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4836 const char *name_a, *name_b;
4837
4838 name_a = a->one ? a->one->path : a->two->path;
4839 name_b = b->one ? b->one->path : b->two->path;
4840 return strcmp(name_a, name_b);
4841 }
4842
4843 void diffcore_fix_diff_index(struct diff_options *options)
4844 {
4845 struct diff_queue_struct *q = &diff_queued_diff;
4846 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4847 }
4848
4849 void diffcore_std(struct diff_options *options)
4850 {
4851 /* NOTE please keep the following in sync with diff_tree_combined() */
4852 if (options->skip_stat_unmatch)
4853 diffcore_skip_stat_unmatch(options);
4854 if (!options->found_follow) {
4855 /* See try_to_follow_renames() in tree-diff.c */
4856 if (options->break_opt != -1)
4857 diffcore_break(options->break_opt);
4858 if (options->detect_rename)
4859 diffcore_rename(options);
4860 if (options->break_opt != -1)
4861 diffcore_merge_broken();
4862 }
4863 if (options->pickaxe)
4864 diffcore_pickaxe(options);
4865 if (options->orderfile)
4866 diffcore_order(options->orderfile);
4867 if (!options->found_follow)
4868 /* See try_to_follow_renames() in tree-diff.c */
4869 diff_resolve_rename_copy();
4870 diffcore_apply_filter(options);
4871
4872 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4873 DIFF_OPT_SET(options, HAS_CHANGES);
4874 else
4875 DIFF_OPT_CLR(options, HAS_CHANGES);
4876
4877 options->found_follow = 0;
4878 }
4879
4880 int diff_result_code(struct diff_options *opt, int status)
4881 {
4882 int result = 0;
4883
4884 diff_warn_rename_limit("diff.renameLimit",
4885 opt->needed_rename_limit,
4886 opt->degraded_cc_to_c);
4887 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4888 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4889 return status;
4890 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4891 DIFF_OPT_TST(opt, HAS_CHANGES))
4892 result |= 01;
4893 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4894 DIFF_OPT_TST(opt, CHECK_FAILED))
4895 result |= 02;
4896 return result;
4897 }
4898
4899 int diff_can_quit_early(struct diff_options *opt)
4900 {
4901 return (DIFF_OPT_TST(opt, QUICK) &&
4902 !opt->filter &&
4903 DIFF_OPT_TST(opt, HAS_CHANGES));
4904 }
4905
4906 /*
4907 * Shall changes to this submodule be ignored?
4908 *
4909 * Submodule changes can be configured to be ignored separately for each path,
4910 * but that configuration can be overridden from the command line.
4911 */
4912 static int is_submodule_ignored(const char *path, struct diff_options *options)
4913 {
4914 int ignored = 0;
4915 unsigned orig_flags = options->flags;
4916 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4917 set_diffopt_flags_from_submodule_config(options, path);
4918 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4919 ignored = 1;
4920 options->flags = orig_flags;
4921 return ignored;
4922 }
4923
4924 void diff_addremove(struct diff_options *options,
4925 int addremove, unsigned mode,
4926 const unsigned char *sha1,
4927 int sha1_valid,
4928 const char *concatpath, unsigned dirty_submodule)
4929 {
4930 struct diff_filespec *one, *two;
4931
4932 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4933 return;
4934
4935 /* This may look odd, but it is a preparation for
4936 * feeding "there are unchanged files which should
4937 * not produce diffs, but when you are doing copy
4938 * detection you would need them, so here they are"
4939 * entries to the diff-core. They will be prefixed
4940 * with something like '=' or '*' (I haven't decided
4941 * which but should not make any difference).
4942 * Feeding the same new and old to diff_change()
4943 * also has the same effect.
4944 * Before the final output happens, they are pruned after
4945 * merged into rename/copy pairs as appropriate.
4946 */
4947 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4948 addremove = (addremove == '+' ? '-' :
4949 addremove == '-' ? '+' : addremove);
4950
4951 if (options->prefix &&
4952 strncmp(concatpath, options->prefix, options->prefix_length))
4953 return;
4954
4955 one = alloc_filespec(concatpath);
4956 two = alloc_filespec(concatpath);
4957
4958 if (addremove != '+')
4959 fill_filespec(one, sha1, sha1_valid, mode);
4960 if (addremove != '-') {
4961 fill_filespec(two, sha1, sha1_valid, mode);
4962 two->dirty_submodule = dirty_submodule;
4963 }
4964
4965 diff_queue(&diff_queued_diff, one, two);
4966 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4967 DIFF_OPT_SET(options, HAS_CHANGES);
4968 }
4969
4970 void diff_change(struct diff_options *options,
4971 unsigned old_mode, unsigned new_mode,
4972 const unsigned char *old_sha1,
4973 const unsigned char *new_sha1,
4974 int old_sha1_valid, int new_sha1_valid,
4975 const char *concatpath,
4976 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4977 {
4978 struct diff_filespec *one, *two;
4979 struct diff_filepair *p;
4980
4981 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4982 is_submodule_ignored(concatpath, options))
4983 return;
4984
4985 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4986 unsigned tmp;
4987 const unsigned char *tmp_c;
4988 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4989 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4990 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
4991 new_sha1_valid = tmp;
4992 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4993 new_dirty_submodule = tmp;
4994 }
4995
4996 if (options->prefix &&
4997 strncmp(concatpath, options->prefix, options->prefix_length))
4998 return;
4999
5000 one = alloc_filespec(concatpath);
5001 two = alloc_filespec(concatpath);
5002 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5003 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5004 one->dirty_submodule = old_dirty_submodule;
5005 two->dirty_submodule = new_dirty_submodule;
5006 p = diff_queue(&diff_queued_diff, one, two);
5007
5008 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5009 return;
5010
5011 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5012 !diff_filespec_check_stat_unmatch(p))
5013 return;
5014
5015 DIFF_OPT_SET(options, HAS_CHANGES);
5016 }
5017
5018 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5019 {
5020 struct diff_filepair *pair;
5021 struct diff_filespec *one, *two;
5022
5023 if (options->prefix &&
5024 strncmp(path, options->prefix, options->prefix_length))
5025 return NULL;
5026
5027 one = alloc_filespec(path);
5028 two = alloc_filespec(path);
5029 pair = diff_queue(&diff_queued_diff, one, two);
5030 pair->is_unmerged = 1;
5031 return pair;
5032 }
5033
5034 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5035 size_t *outsize)
5036 {
5037 struct diff_tempfile *temp;
5038 const char *argv[3];
5039 const char **arg = argv;
5040 struct child_process child = CHILD_PROCESS_INIT;
5041 struct strbuf buf = STRBUF_INIT;
5042 int err = 0;
5043
5044 temp = prepare_temp_file(spec->path, spec);
5045 *arg++ = pgm;
5046 *arg++ = temp->name;
5047 *arg = NULL;
5048
5049 child.use_shell = 1;
5050 child.argv = argv;
5051 child.out = -1;
5052 if (start_command(&child)) {
5053 remove_tempfile();
5054 return NULL;
5055 }
5056
5057 if (strbuf_read(&buf, child.out, 0) < 0)
5058 err = error("error reading from textconv command '%s'", pgm);
5059 close(child.out);
5060
5061 if (finish_command(&child) || err) {
5062 strbuf_release(&buf);
5063 remove_tempfile();
5064 return NULL;
5065 }
5066 remove_tempfile();
5067
5068 return strbuf_detach(&buf, outsize);
5069 }
5070
5071 size_t fill_textconv(struct userdiff_driver *driver,
5072 struct diff_filespec *df,
5073 char **outbuf)
5074 {
5075 size_t size;
5076
5077 if (!driver || !driver->textconv) {
5078 if (!DIFF_FILE_VALID(df)) {
5079 *outbuf = "";
5080 return 0;
5081 }
5082 if (diff_populate_filespec(df, 0))
5083 die("unable to read files to diff");
5084 *outbuf = df->data;
5085 return df->size;
5086 }
5087
5088 if (driver->textconv_cache && df->sha1_valid) {
5089 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5090 &size);
5091 if (*outbuf)
5092 return size;
5093 }
5094
5095 *outbuf = run_textconv(driver->textconv, df, &size);
5096 if (!*outbuf)
5097 die("unable to read files to diff");
5098
5099 if (driver->textconv_cache && df->sha1_valid) {
5100 /* ignore errors, as we might be in a readonly repository */
5101 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5102 size);
5103 /*
5104 * we could save up changes and flush them all at the end,
5105 * but we would need an extra call after all diffing is done.
5106 * Since generating a cache entry is the slow path anyway,
5107 * this extra overhead probably isn't a big deal.
5108 */
5109 notes_cache_write(driver->textconv_cache);
5110 }
5111
5112 return size;
5113 }
5114
5115 void setup_diff_pager(struct diff_options *opt)
5116 {
5117 /*
5118 * If the user asked for our exit code, then either they want --quiet
5119 * or --exit-code. We should definitely not bother with a pager in the
5120 * former case, as we will generate no output. Since we still properly
5121 * report our exit code even when a pager is run, we _could_ run a
5122 * pager with --exit-code. But since we have not done so historically,
5123 * and because it is easy to find people oneline advising "git diff
5124 * --exit-code" in hooks and other scripts, we do not do so.
5125 */
5126 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5127 check_pager_config("diff") != 0)
5128 setup_pager();
5129 }
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