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wt-status.c: make wt_status_check_rebase() work on any worktree
[git.git] / diff.c
blob4dfe6609d059b56c5ab4dd31c8d2139c7fa90abb
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "tempfile.h"
6 #include "quote.h"
7 #include "diff.h"
8 #include "diffcore.h"
9 #include "delta.h"
10 #include "xdiff-interface.h"
11 #include "color.h"
12 #include "attr.h"
13 #include "run-command.h"
14 #include "utf8.h"
15 #include "userdiff.h"
16 #include "submodule-config.h"
17 #include "submodule.h"
18 #include "ll-merge.h"
19 #include "string-list.h"
20 #include "argv-array.h"
21
22 #ifdef NO_FAST_WORKING_DIRECTORY
23 #define FAST_WORKING_DIRECTORY 0
24 #else
25 #define FAST_WORKING_DIRECTORY 1
26 #endif
27
28 static int diff_detect_rename_default;
29 static int diff_rename_limit_default = 400;
30 static int diff_suppress_blank_empty;
31 static int diff_use_color_default = -1;
32 static int diff_context_default = 3;
33 static const char *diff_word_regex_cfg;
34 static const char *external_diff_cmd_cfg;
35 static const char *diff_order_file_cfg;
36 int diff_auto_refresh_index = 1;
37 static int diff_mnemonic_prefix;
38 static int diff_no_prefix;
39 static int diff_stat_graph_width;
40 static int diff_dirstat_permille_default = 30;
41 static struct diff_options default_diff_options;
42 static long diff_algorithm;
43
44 static char diff_colors[][COLOR_MAXLEN] = {
45 GIT_COLOR_RESET,
46 GIT_COLOR_NORMAL, /* CONTEXT */
47 GIT_COLOR_BOLD, /* METAINFO */
48 GIT_COLOR_CYAN, /* FRAGINFO */
49 GIT_COLOR_RED, /* OLD */
50 GIT_COLOR_GREEN, /* NEW */
51 GIT_COLOR_YELLOW, /* COMMIT */
52 GIT_COLOR_BG_RED, /* WHITESPACE */
53 GIT_COLOR_NORMAL, /* FUNCINFO */
54 };
55
56 static int parse_diff_color_slot(const char *var)
57 {
58 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
59 return DIFF_CONTEXT;
60 if (!strcasecmp(var, "meta"))
61 return DIFF_METAINFO;
62 if (!strcasecmp(var, "frag"))
63 return DIFF_FRAGINFO;
64 if (!strcasecmp(var, "old"))
65 return DIFF_FILE_OLD;
66 if (!strcasecmp(var, "new"))
67 return DIFF_FILE_NEW;
68 if (!strcasecmp(var, "commit"))
69 return DIFF_COMMIT;
70 if (!strcasecmp(var, "whitespace"))
71 return DIFF_WHITESPACE;
72 if (!strcasecmp(var, "func"))
73 return DIFF_FUNCINFO;
74 return -1;
75 }
76
77 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
78 struct strbuf *errmsg)
79 {
80 char *params_copy = xstrdup(params_string);
81 struct string_list params = STRING_LIST_INIT_NODUP;
82 int ret = 0;
83 int i;
84
85 if (*params_copy)
86 string_list_split_in_place(&params, params_copy, ',', -1);
87 for (i = 0; i < params.nr; i++) {
88 const char *p = params.items[i].string;
89 if (!strcmp(p, "changes")) {
90 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
91 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
92 } else if (!strcmp(p, "lines")) {
93 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
94 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
95 } else if (!strcmp(p, "files")) {
96 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
97 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
98 } else if (!strcmp(p, "noncumulative")) {
99 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
100 } else if (!strcmp(p, "cumulative")) {
101 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
102 } else if (isdigit(*p)) {
103 char *end;
104 int permille = strtoul(p, &end, 10) * 10;
105 if (*end == '.' && isdigit(*++end)) {
106 /* only use first digit */
107 permille += *end - '0';
108 /* .. and ignore any further digits */
109 while (isdigit(*++end))
110 ; /* nothing */
111 }
112 if (!*end)
113 options->dirstat_permille = permille;
114 else {
115 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
116 p);
117 ret++;
118 }
119 } else {
120 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
121 ret++;
122 }
123
124 }
125 string_list_clear(&params, 0);
126 free(params_copy);
127 return ret;
128 }
129
130 static int parse_submodule_params(struct diff_options *options, const char *value)
131 {
132 if (!strcmp(value, "log"))
133 DIFF_OPT_SET(options, SUBMODULE_LOG);
134 else if (!strcmp(value, "short"))
135 DIFF_OPT_CLR(options, SUBMODULE_LOG);
136 else
137 return -1;
138 return 0;
139 }
140
141 static int git_config_rename(const char *var, const char *value)
142 {
143 if (!value)
144 return DIFF_DETECT_RENAME;
145 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
146 return DIFF_DETECT_COPY;
147 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
148 }
149
150 long parse_algorithm_value(const char *value)
151 {
152 if (!value)
153 return -1;
154 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
155 return 0;
156 else if (!strcasecmp(value, "minimal"))
157 return XDF_NEED_MINIMAL;
158 else if (!strcasecmp(value, "patience"))
159 return XDF_PATIENCE_DIFF;
160 else if (!strcasecmp(value, "histogram"))
161 return XDF_HISTOGRAM_DIFF;
162 return -1;
163 }
164
165 /*
166 * These are to give UI layer defaults.
167 * The core-level commands such as git-diff-files should
168 * never be affected by the setting of diff.renames
169 * the user happens to have in the configuration file.
170 */
171 void init_diff_ui_defaults(void)
172 {
173 diff_detect_rename_default = 1;
174 }
175
176 int git_diff_ui_config(const char *var, const char *value, void *cb)
177 {
178 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
179 diff_use_color_default = git_config_colorbool(var, value);
180 return 0;
181 }
182 if (!strcmp(var, "diff.context")) {
183 diff_context_default = git_config_int(var, value);
184 if (diff_context_default < 0)
185 return -1;
186 return 0;
187 }
188 if (!strcmp(var, "diff.renames")) {
189 diff_detect_rename_default = git_config_rename(var, value);
190 return 0;
191 }
192 if (!strcmp(var, "diff.autorefreshindex")) {
193 diff_auto_refresh_index = git_config_bool(var, value);
194 return 0;
195 }
196 if (!strcmp(var, "diff.mnemonicprefix")) {
197 diff_mnemonic_prefix = git_config_bool(var, value);
198 return 0;
199 }
200 if (!strcmp(var, "diff.noprefix")) {
201 diff_no_prefix = git_config_bool(var, value);
202 return 0;
203 }
204 if (!strcmp(var, "diff.statgraphwidth")) {
205 diff_stat_graph_width = git_config_int(var, value);
206 return 0;
207 }
208 if (!strcmp(var, "diff.external"))
209 return git_config_string(&external_diff_cmd_cfg, var, value);
210 if (!strcmp(var, "diff.wordregex"))
211 return git_config_string(&diff_word_regex_cfg, var, value);
212 if (!strcmp(var, "diff.orderfile"))
213 return git_config_pathname(&diff_order_file_cfg, var, value);
214
215 if (!strcmp(var, "diff.ignoresubmodules"))
216 handle_ignore_submodules_arg(&default_diff_options, value);
217
218 if (!strcmp(var, "diff.submodule")) {
219 if (parse_submodule_params(&default_diff_options, value))
220 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
221 value);
222 return 0;
223 }
224
225 if (!strcmp(var, "diff.algorithm")) {
226 diff_algorithm = parse_algorithm_value(value);
227 if (diff_algorithm < 0)
228 return -1;
229 return 0;
230 }
231
232 if (git_color_config(var, value, cb) < 0)
233 return -1;
234
235 return git_diff_basic_config(var, value, cb);
236 }
237
238 int git_diff_basic_config(const char *var, const char *value, void *cb)
239 {
240 const char *name;
241
242 if (!strcmp(var, "diff.renamelimit")) {
243 diff_rename_limit_default = git_config_int(var, value);
244 return 0;
245 }
246
247 if (userdiff_config(var, value) < 0)
248 return -1;
249
250 if (skip_prefix(var, "diff.color.", &name) ||
251 skip_prefix(var, "color.diff.", &name)) {
252 int slot = parse_diff_color_slot(name);
253 if (slot < 0)
254 return 0;
255 if (!value)
256 return config_error_nonbool(var);
257 return color_parse(value, diff_colors[slot]);
258 }
259
260 /* like GNU diff's --suppress-blank-empty option */
261 if (!strcmp(var, "diff.suppressblankempty") ||
262 /* for backwards compatibility */
263 !strcmp(var, "diff.suppress-blank-empty")) {
264 diff_suppress_blank_empty = git_config_bool(var, value);
265 return 0;
266 }
267
268 if (!strcmp(var, "diff.dirstat")) {
269 struct strbuf errmsg = STRBUF_INIT;
270 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
271 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
272 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
273 errmsg.buf);
274 strbuf_release(&errmsg);
275 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
276 return 0;
277 }
278
279 if (starts_with(var, "submodule."))
280 return parse_submodule_config_option(var, value);
281
282 return git_default_config(var, value, cb);
283 }
284
285 static char *quote_two(const char *one, const char *two)
286 {
287 int need_one = quote_c_style(one, NULL, NULL, 1);
288 int need_two = quote_c_style(two, NULL, NULL, 1);
289 struct strbuf res = STRBUF_INIT;
290
291 if (need_one + need_two) {
292 strbuf_addch(&res, '"');
293 quote_c_style(one, &res, NULL, 1);
294 quote_c_style(two, &res, NULL, 1);
295 strbuf_addch(&res, '"');
296 } else {
297 strbuf_addstr(&res, one);
298 strbuf_addstr(&res, two);
299 }
300 return strbuf_detach(&res, NULL);
301 }
302
303 static const char *external_diff(void)
304 {
305 static const char *external_diff_cmd = NULL;
306 static int done_preparing = 0;
307
308 if (done_preparing)
309 return external_diff_cmd;
310 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
311 if (!external_diff_cmd)
312 external_diff_cmd = external_diff_cmd_cfg;
313 done_preparing = 1;
314 return external_diff_cmd;
315 }
316
317 /*
318 * Keep track of files used for diffing. Sometimes such an entry
319 * refers to a temporary file, sometimes to an existing file, and
320 * sometimes to "/dev/null".
321 */
322 static struct diff_tempfile {
323 /*
324 * filename external diff should read from, or NULL if this
325 * entry is currently not in use:
326 */
327 const char *name;
328
329 char hex[GIT_SHA1_HEXSZ + 1];
330 char mode[10];
331
332 /*
333 * If this diff_tempfile instance refers to a temporary file,
334 * this tempfile object is used to manage its lifetime.
335 */
336 struct tempfile tempfile;
337 } diff_temp[2];
338
339 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
340
341 struct emit_callback {
342 int color_diff;
343 unsigned ws_rule;
344 int blank_at_eof_in_preimage;
345 int blank_at_eof_in_postimage;
346 int lno_in_preimage;
347 int lno_in_postimage;
348 sane_truncate_fn truncate;
349 const char **label_path;
350 struct diff_words_data *diff_words;
351 struct diff_options *opt;
352 int *found_changesp;
353 struct strbuf *header;
354 };
355
356 static int count_lines(const char *data, int size)
357 {
358 int count, ch, completely_empty = 1, nl_just_seen = 0;
359 count = 0;
360 while (0 < size--) {
361 ch = *data++;
362 if (ch == '\n') {
363 count++;
364 nl_just_seen = 1;
365 completely_empty = 0;
366 }
367 else {
368 nl_just_seen = 0;
369 completely_empty = 0;
370 }
371 }
372 if (completely_empty)
373 return 0;
374 if (!nl_just_seen)
375 count++; /* no trailing newline */
376 return count;
377 }
378
379 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
380 {
381 if (!DIFF_FILE_VALID(one)) {
382 mf->ptr = (char *)""; /* does not matter */
383 mf->size = 0;
384 return 0;
385 }
386 else if (diff_populate_filespec(one, 0))
387 return -1;
388
389 mf->ptr = one->data;
390 mf->size = one->size;
391 return 0;
392 }
393
394 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
395 static unsigned long diff_filespec_size(struct diff_filespec *one)
396 {
397 if (!DIFF_FILE_VALID(one))
398 return 0;
399 diff_populate_filespec(one, CHECK_SIZE_ONLY);
400 return one->size;
401 }
402
403 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
404 {
405 char *ptr = mf->ptr;
406 long size = mf->size;
407 int cnt = 0;
408
409 if (!size)
410 return cnt;
411 ptr += size - 1; /* pointing at the very end */
412 if (*ptr != '\n')
413 ; /* incomplete line */
414 else
415 ptr--; /* skip the last LF */
416 while (mf->ptr < ptr) {
417 char *prev_eol;
418 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
419 if (*prev_eol == '\n')
420 break;
421 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
422 break;
423 cnt++;
424 ptr = prev_eol - 1;
425 }
426 return cnt;
427 }
428
429 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
430 struct emit_callback *ecbdata)
431 {
432 int l1, l2, at;
433 unsigned ws_rule = ecbdata->ws_rule;
434 l1 = count_trailing_blank(mf1, ws_rule);
435 l2 = count_trailing_blank(mf2, ws_rule);
436 if (l2 <= l1) {
437 ecbdata->blank_at_eof_in_preimage = 0;
438 ecbdata->blank_at_eof_in_postimage = 0;
439 return;
440 }
441 at = count_lines(mf1->ptr, mf1->size);
442 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
443
444 at = count_lines(mf2->ptr, mf2->size);
445 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
446 }
447
448 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
449 int first, const char *line, int len)
450 {
451 int has_trailing_newline, has_trailing_carriage_return;
452 int nofirst;
453 FILE *file = o->file;
454
455 fputs(diff_line_prefix(o), file);
456
457 if (len == 0) {
458 has_trailing_newline = (first == '\n');
459 has_trailing_carriage_return = (!has_trailing_newline &&
460 (first == '\r'));
461 nofirst = has_trailing_newline || has_trailing_carriage_return;
462 } else {
463 has_trailing_newline = (len > 0 && line[len-1] == '\n');
464 if (has_trailing_newline)
465 len--;
466 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
467 if (has_trailing_carriage_return)
468 len--;
469 nofirst = 0;
470 }
471
472 if (len || !nofirst) {
473 fputs(set, file);
474 if (!nofirst)
475 fputc(first, file);
476 fwrite(line, len, 1, file);
477 fputs(reset, file);
478 }
479 if (has_trailing_carriage_return)
480 fputc('\r', file);
481 if (has_trailing_newline)
482 fputc('\n', file);
483 }
484
485 static void emit_line(struct diff_options *o, const char *set, const char *reset,
486 const char *line, int len)
487 {
488 emit_line_0(o, set, reset, line[0], line+1, len-1);
489 }
490
491 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
492 {
493 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
494 ecbdata->blank_at_eof_in_preimage &&
495 ecbdata->blank_at_eof_in_postimage &&
496 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
497 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
498 return 0;
499 return ws_blank_line(line, len, ecbdata->ws_rule);
500 }
501
502 static void emit_line_checked(const char *reset,
503 struct emit_callback *ecbdata,
504 const char *line, int len,
505 enum color_diff color,
506 unsigned ws_error_highlight,
507 char sign)
508 {
509 const char *set = diff_get_color(ecbdata->color_diff, color);
510 const char *ws = NULL;
511
512 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
513 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
514 if (!*ws)
515 ws = NULL;
516 }
517
518 if (!ws)
519 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
520 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
521 /* Blank line at EOF - paint '+' as well */
522 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
523 else {
524 /* Emit just the prefix, then the rest. */
525 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
526 ws_check_emit(line, len, ecbdata->ws_rule,
527 ecbdata->opt->file, set, reset, ws);
528 }
529 }
530
531 static void emit_add_line(const char *reset,
532 struct emit_callback *ecbdata,
533 const char *line, int len)
534 {
535 emit_line_checked(reset, ecbdata, line, len,
536 DIFF_FILE_NEW, WSEH_NEW, '+');
537 }
538
539 static void emit_del_line(const char *reset,
540 struct emit_callback *ecbdata,
541 const char *line, int len)
542 {
543 emit_line_checked(reset, ecbdata, line, len,
544 DIFF_FILE_OLD, WSEH_OLD, '-');
545 }
546
547 static void emit_context_line(const char *reset,
548 struct emit_callback *ecbdata,
549 const char *line, int len)
550 {
551 emit_line_checked(reset, ecbdata, line, len,
552 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
553 }
554
555 static void emit_hunk_header(struct emit_callback *ecbdata,
556 const char *line, int len)
557 {
558 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
559 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
560 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
561 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
562 static const char atat[2] = { '@', '@' };
563 const char *cp, *ep;
564 struct strbuf msgbuf = STRBUF_INIT;
565 int org_len = len;
566 int i = 1;
567
568 /*
569 * As a hunk header must begin with "@@ -<old>, +<new> @@",
570 * it always is at least 10 bytes long.
571 */
572 if (len < 10 ||
573 memcmp(line, atat, 2) ||
574 !(ep = memmem(line + 2, len - 2, atat, 2))) {
575 emit_line(ecbdata->opt, context, reset, line, len);
576 return;
577 }
578 ep += 2; /* skip over @@ */
579
580 /* The hunk header in fraginfo color */
581 strbuf_addstr(&msgbuf, frag);
582 strbuf_add(&msgbuf, line, ep - line);
583 strbuf_addstr(&msgbuf, reset);
584
585 /*
586 * trailing "\r\n"
587 */
588 for ( ; i < 3; i++)
589 if (line[len - i] == '\r' || line[len - i] == '\n')
590 len--;
591
592 /* blank before the func header */
593 for (cp = ep; ep - line < len; ep++)
594 if (*ep != ' ' && *ep != '\t')
595 break;
596 if (ep != cp) {
597 strbuf_addstr(&msgbuf, context);
598 strbuf_add(&msgbuf, cp, ep - cp);
599 strbuf_addstr(&msgbuf, reset);
600 }
601
602 if (ep < line + len) {
603 strbuf_addstr(&msgbuf, func);
604 strbuf_add(&msgbuf, ep, line + len - ep);
605 strbuf_addstr(&msgbuf, reset);
606 }
607
608 strbuf_add(&msgbuf, line + len, org_len - len);
609 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
610 strbuf_release(&msgbuf);
611 }
612
613 static struct diff_tempfile *claim_diff_tempfile(void) {
614 int i;
615 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
616 if (!diff_temp[i].name)
617 return diff_temp + i;
618 die("BUG: diff is failing to clean up its tempfiles");
619 }
620
621 static void remove_tempfile(void)
622 {
623 int i;
624 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
625 if (is_tempfile_active(&diff_temp[i].tempfile))
626 delete_tempfile(&diff_temp[i].tempfile);
627 diff_temp[i].name = NULL;
628 }
629 }
630
631 static void print_line_count(FILE *file, int count)
632 {
633 switch (count) {
634 case 0:
635 fprintf(file, "0,0");
636 break;
637 case 1:
638 fprintf(file, "1");
639 break;
640 default:
641 fprintf(file, "1,%d", count);
642 break;
643 }
644 }
645
646 static void emit_rewrite_lines(struct emit_callback *ecb,
647 int prefix, const char *data, int size)
648 {
649 const char *endp = NULL;
650 static const char *nneof = " No newline at end of file\n";
651 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
652
653 while (0 < size) {
654 int len;
655
656 endp = memchr(data, '\n', size);
657 len = endp ? (endp - data + 1) : size;
658 if (prefix != '+') {
659 ecb->lno_in_preimage++;
660 emit_del_line(reset, ecb, data, len);
661 } else {
662 ecb->lno_in_postimage++;
663 emit_add_line(reset, ecb, data, len);
664 }
665 size -= len;
666 data += len;
667 }
668 if (!endp) {
669 const char *context = diff_get_color(ecb->color_diff,
670 DIFF_CONTEXT);
671 putc('\n', ecb->opt->file);
672 emit_line_0(ecb->opt, context, reset, '\\',
673 nneof, strlen(nneof));
674 }
675 }
676
677 static void emit_rewrite_diff(const char *name_a,
678 const char *name_b,
679 struct diff_filespec *one,
680 struct diff_filespec *two,
681 struct userdiff_driver *textconv_one,
682 struct userdiff_driver *textconv_two,
683 struct diff_options *o)
684 {
685 int lc_a, lc_b;
686 const char *name_a_tab, *name_b_tab;
687 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
688 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
689 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
690 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
691 const char *a_prefix, *b_prefix;
692 char *data_one, *data_two;
693 size_t size_one, size_two;
694 struct emit_callback ecbdata;
695 const char *line_prefix = diff_line_prefix(o);
696
697 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
698 a_prefix = o->b_prefix;
699 b_prefix = o->a_prefix;
700 } else {
701 a_prefix = o->a_prefix;
702 b_prefix = o->b_prefix;
703 }
704
705 name_a += (*name_a == '/');
706 name_b += (*name_b == '/');
707 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
708 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
709
710 strbuf_reset(&a_name);
711 strbuf_reset(&b_name);
712 quote_two_c_style(&a_name, a_prefix, name_a, 0);
713 quote_two_c_style(&b_name, b_prefix, name_b, 0);
714
715 size_one = fill_textconv(textconv_one, one, &data_one);
716 size_two = fill_textconv(textconv_two, two, &data_two);
717
718 memset(&ecbdata, 0, sizeof(ecbdata));
719 ecbdata.color_diff = want_color(o->use_color);
720 ecbdata.found_changesp = &o->found_changes;
721 ecbdata.ws_rule = whitespace_rule(name_b);
722 ecbdata.opt = o;
723 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
724 mmfile_t mf1, mf2;
725 mf1.ptr = (char *)data_one;
726 mf2.ptr = (char *)data_two;
727 mf1.size = size_one;
728 mf2.size = size_two;
729 check_blank_at_eof(&mf1, &mf2, &ecbdata);
730 }
731 ecbdata.lno_in_preimage = 1;
732 ecbdata.lno_in_postimage = 1;
733
734 lc_a = count_lines(data_one, size_one);
735 lc_b = count_lines(data_two, size_two);
736 fprintf(o->file,
737 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
738 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
739 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
740 line_prefix, fraginfo);
741 if (!o->irreversible_delete)
742 print_line_count(o->file, lc_a);
743 else
744 fprintf(o->file, "?,?");
745 fprintf(o->file, " +");
746 print_line_count(o->file, lc_b);
747 fprintf(o->file, " @@%s\n", reset);
748 if (lc_a && !o->irreversible_delete)
749 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
750 if (lc_b)
751 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
752 if (textconv_one)
753 free((char *)data_one);
754 if (textconv_two)
755 free((char *)data_two);
756 }
757
758 struct diff_words_buffer {
759 mmfile_t text;
760 long alloc;
761 struct diff_words_orig {
762 const char *begin, *end;
763 } *orig;
764 int orig_nr, orig_alloc;
765 };
766
767 static void diff_words_append(char *line, unsigned long len,
768 struct diff_words_buffer *buffer)
769 {
770 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
771 line++;
772 len--;
773 memcpy(buffer->text.ptr + buffer->text.size, line, len);
774 buffer->text.size += len;
775 buffer->text.ptr[buffer->text.size] = '\0';
776 }
777
778 struct diff_words_style_elem {
779 const char *prefix;
780 const char *suffix;
781 const char *color; /* NULL; filled in by the setup code if
782 * color is enabled */
783 };
784
785 struct diff_words_style {
786 enum diff_words_type type;
787 struct diff_words_style_elem new, old, ctx;
788 const char *newline;
789 };
790
791 static struct diff_words_style diff_words_styles[] = {
792 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
793 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
794 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
795 };
796
797 struct diff_words_data {
798 struct diff_words_buffer minus, plus;
799 const char *current_plus;
800 int last_minus;
801 struct diff_options *opt;
802 regex_t *word_regex;
803 enum diff_words_type type;
804 struct diff_words_style *style;
805 };
806
807 static int fn_out_diff_words_write_helper(FILE *fp,
808 struct diff_words_style_elem *st_el,
809 const char *newline,
810 size_t count, const char *buf,
811 const char *line_prefix)
812 {
813 int print = 0;
814
815 while (count) {
816 char *p = memchr(buf, '\n', count);
817 if (print)
818 fputs(line_prefix, fp);
819 if (p != buf) {
820 if (st_el->color && fputs(st_el->color, fp) < 0)
821 return -1;
822 if (fputs(st_el->prefix, fp) < 0 ||
823 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
824 fputs(st_el->suffix, fp) < 0)
825 return -1;
826 if (st_el->color && *st_el->color
827 && fputs(GIT_COLOR_RESET, fp) < 0)
828 return -1;
829 }
830 if (!p)
831 return 0;
832 if (fputs(newline, fp) < 0)
833 return -1;
834 count -= p + 1 - buf;
835 buf = p + 1;
836 print = 1;
837 }
838 return 0;
839 }
840
841 /*
842 * '--color-words' algorithm can be described as:
843 *
844 * 1. collect a the minus/plus lines of a diff hunk, divided into
845 * minus-lines and plus-lines;
846 *
847 * 2. break both minus-lines and plus-lines into words and
848 * place them into two mmfile_t with one word for each line;
849 *
850 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
851 *
852 * And for the common parts of the both file, we output the plus side text.
853 * diff_words->current_plus is used to trace the current position of the plus file
854 * which printed. diff_words->last_minus is used to trace the last minus word
855 * printed.
856 *
857 * For '--graph' to work with '--color-words', we need to output the graph prefix
858 * on each line of color words output. Generally, there are two conditions on
859 * which we should output the prefix.
860 *
861 * 1. diff_words->last_minus == 0 &&
862 * diff_words->current_plus == diff_words->plus.text.ptr
863 *
864 * that is: the plus text must start as a new line, and if there is no minus
865 * word printed, a graph prefix must be printed.
866 *
867 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
868 * *(diff_words->current_plus - 1) == '\n'
869 *
870 * that is: a graph prefix must be printed following a '\n'
871 */
872 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
873 {
874 if ((diff_words->last_minus == 0 &&
875 diff_words->current_plus == diff_words->plus.text.ptr) ||
876 (diff_words->current_plus > diff_words->plus.text.ptr &&
877 *(diff_words->current_plus - 1) == '\n')) {
878 return 1;
879 } else {
880 return 0;
881 }
882 }
883
884 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
885 {
886 struct diff_words_data *diff_words = priv;
887 struct diff_words_style *style = diff_words->style;
888 int minus_first, minus_len, plus_first, plus_len;
889 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
890 struct diff_options *opt = diff_words->opt;
891 const char *line_prefix;
892
893 if (line[0] != '@' || parse_hunk_header(line, len,
894 &minus_first, &minus_len, &plus_first, &plus_len))
895 return;
896
897 assert(opt);
898 line_prefix = diff_line_prefix(opt);
899
900 /* POSIX requires that first be decremented by one if len == 0... */
901 if (minus_len) {
902 minus_begin = diff_words->minus.orig[minus_first].begin;
903 minus_end =
904 diff_words->minus.orig[minus_first + minus_len - 1].end;
905 } else
906 minus_begin = minus_end =
907 diff_words->minus.orig[minus_first].end;
908
909 if (plus_len) {
910 plus_begin = diff_words->plus.orig[plus_first].begin;
911 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
912 } else
913 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
914
915 if (color_words_output_graph_prefix(diff_words)) {
916 fputs(line_prefix, diff_words->opt->file);
917 }
918 if (diff_words->current_plus != plus_begin) {
919 fn_out_diff_words_write_helper(diff_words->opt->file,
920 &style->ctx, style->newline,
921 plus_begin - diff_words->current_plus,
922 diff_words->current_plus, line_prefix);
923 if (*(plus_begin - 1) == '\n')
924 fputs(line_prefix, diff_words->opt->file);
925 }
926 if (minus_begin != minus_end) {
927 fn_out_diff_words_write_helper(diff_words->opt->file,
928 &style->old, style->newline,
929 minus_end - minus_begin, minus_begin,
930 line_prefix);
931 }
932 if (plus_begin != plus_end) {
933 fn_out_diff_words_write_helper(diff_words->opt->file,
934 &style->new, style->newline,
935 plus_end - plus_begin, plus_begin,
936 line_prefix);
937 }
938
939 diff_words->current_plus = plus_end;
940 diff_words->last_minus = minus_first;
941 }
942
943 /* This function starts looking at *begin, and returns 0 iff a word was found. */
944 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
945 int *begin, int *end)
946 {
947 if (word_regex && *begin < buffer->size) {
948 regmatch_t match[1];
949 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
950 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
951 '\n', match[0].rm_eo - match[0].rm_so);
952 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
953 *begin += match[0].rm_so;
954 return *begin >= *end;
955 }
956 return -1;
957 }
958
959 /* find the next word */
960 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
961 (*begin)++;
962 if (*begin >= buffer->size)
963 return -1;
964
965 /* find the end of the word */
966 *end = *begin + 1;
967 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
968 (*end)++;
969
970 return 0;
971 }
972
973 /*
974 * This function splits the words in buffer->text, stores the list with
975 * newline separator into out, and saves the offsets of the original words
976 * in buffer->orig.
977 */
978 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
979 regex_t *word_regex)
980 {
981 int i, j;
982 long alloc = 0;
983
984 out->size = 0;
985 out->ptr = NULL;
986
987 /* fake an empty "0th" word */
988 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
989 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
990 buffer->orig_nr = 1;
991
992 for (i = 0; i < buffer->text.size; i++) {
993 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
994 return;
995
996 /* store original boundaries */
997 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
998 buffer->orig_alloc);
999 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1000 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1001 buffer->orig_nr++;
1002
1003 /* store one word */
1004 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1005 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1006 out->ptr[out->size + j - i] = '\n';
1007 out->size += j - i + 1;
1008
1009 i = j - 1;
1010 }
1011 }
1012
1013 /* this executes the word diff on the accumulated buffers */
1014 static void diff_words_show(struct diff_words_data *diff_words)
1015 {
1016 xpparam_t xpp;
1017 xdemitconf_t xecfg;
1018 mmfile_t minus, plus;
1019 struct diff_words_style *style = diff_words->style;
1020
1021 struct diff_options *opt = diff_words->opt;
1022 const char *line_prefix;
1023
1024 assert(opt);
1025 line_prefix = diff_line_prefix(opt);
1026
1027 /* special case: only removal */
1028 if (!diff_words->plus.text.size) {
1029 fputs(line_prefix, diff_words->opt->file);
1030 fn_out_diff_words_write_helper(diff_words->opt->file,
1031 &style->old, style->newline,
1032 diff_words->minus.text.size,
1033 diff_words->minus.text.ptr, line_prefix);
1034 diff_words->minus.text.size = 0;
1035 return;
1036 }
1037
1038 diff_words->current_plus = diff_words->plus.text.ptr;
1039 diff_words->last_minus = 0;
1040
1041 memset(&xpp, 0, sizeof(xpp));
1042 memset(&xecfg, 0, sizeof(xecfg));
1043 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1044 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1045 xpp.flags = 0;
1046 /* as only the hunk header will be parsed, we need a 0-context */
1047 xecfg.ctxlen = 0;
1048 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1049 &xpp, &xecfg))
1050 die("unable to generate word diff");
1051 free(minus.ptr);
1052 free(plus.ptr);
1053 if (diff_words->current_plus != diff_words->plus.text.ptr +
1054 diff_words->plus.text.size) {
1055 if (color_words_output_graph_prefix(diff_words))
1056 fputs(line_prefix, diff_words->opt->file);
1057 fn_out_diff_words_write_helper(diff_words->opt->file,
1058 &style->ctx, style->newline,
1059 diff_words->plus.text.ptr + diff_words->plus.text.size
1060 - diff_words->current_plus, diff_words->current_plus,
1061 line_prefix);
1062 }
1063 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1064 }
1065
1066 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1067 static void diff_words_flush(struct emit_callback *ecbdata)
1068 {
1069 if (ecbdata->diff_words->minus.text.size ||
1070 ecbdata->diff_words->plus.text.size)
1071 diff_words_show(ecbdata->diff_words);
1072 }
1073
1074 static void diff_filespec_load_driver(struct diff_filespec *one)
1075 {
1076 /* Use already-loaded driver */
1077 if (one->driver)
1078 return;
1079
1080 if (S_ISREG(one->mode))
1081 one->driver = userdiff_find_by_path(one->path);
1082
1083 /* Fallback to default settings */
1084 if (!one->driver)
1085 one->driver = userdiff_find_by_name("default");
1086 }
1087
1088 static const char *userdiff_word_regex(struct diff_filespec *one)
1089 {
1090 diff_filespec_load_driver(one);
1091 return one->driver->word_regex;
1092 }
1093
1094 static void init_diff_words_data(struct emit_callback *ecbdata,
1095 struct diff_options *orig_opts,
1096 struct diff_filespec *one,
1097 struct diff_filespec *two)
1098 {
1099 int i;
1100 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1101 memcpy(o, orig_opts, sizeof(struct diff_options));
1102
1103 ecbdata->diff_words =
1104 xcalloc(1, sizeof(struct diff_words_data));
1105 ecbdata->diff_words->type = o->word_diff;
1106 ecbdata->diff_words->opt = o;
1107 if (!o->word_regex)
1108 o->word_regex = userdiff_word_regex(one);
1109 if (!o->word_regex)
1110 o->word_regex = userdiff_word_regex(two);
1111 if (!o->word_regex)
1112 o->word_regex = diff_word_regex_cfg;
1113 if (o->word_regex) {
1114 ecbdata->diff_words->word_regex = (regex_t *)
1115 xmalloc(sizeof(regex_t));
1116 if (regcomp(ecbdata->diff_words->word_regex,
1117 o->word_regex,
1118 REG_EXTENDED | REG_NEWLINE))
1119 die ("Invalid regular expression: %s",
1120 o->word_regex);
1121 }
1122 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1123 if (o->word_diff == diff_words_styles[i].type) {
1124 ecbdata->diff_words->style =
1125 &diff_words_styles[i];
1126 break;
1127 }
1128 }
1129 if (want_color(o->use_color)) {
1130 struct diff_words_style *st = ecbdata->diff_words->style;
1131 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1132 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1133 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1134 }
1135 }
1136
1137 static void free_diff_words_data(struct emit_callback *ecbdata)
1138 {
1139 if (ecbdata->diff_words) {
1140 diff_words_flush(ecbdata);
1141 free (ecbdata->diff_words->opt);
1142 free (ecbdata->diff_words->minus.text.ptr);
1143 free (ecbdata->diff_words->minus.orig);
1144 free (ecbdata->diff_words->plus.text.ptr);
1145 free (ecbdata->diff_words->plus.orig);
1146 if (ecbdata->diff_words->word_regex) {
1147 regfree(ecbdata->diff_words->word_regex);
1148 free(ecbdata->diff_words->word_regex);
1149 }
1150 free(ecbdata->diff_words);
1151 ecbdata->diff_words = NULL;
1152 }
1153 }
1154
1155 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1156 {
1157 if (want_color(diff_use_color))
1158 return diff_colors[ix];
1159 return "";
1160 }
1161
1162 const char *diff_line_prefix(struct diff_options *opt)
1163 {
1164 struct strbuf *msgbuf;
1165 if (!opt->output_prefix)
1166 return "";
1167
1168 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1169 return msgbuf->buf;
1170 }
1171
1172 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1173 {
1174 const char *cp;
1175 unsigned long allot;
1176 size_t l = len;
1177
1178 if (ecb->truncate)
1179 return ecb->truncate(line, len);
1180 cp = line;
1181 allot = l;
1182 while (0 < l) {
1183 (void) utf8_width(&cp, &l);
1184 if (!cp)
1185 break; /* truncated in the middle? */
1186 }
1187 return allot - l;
1188 }
1189
1190 static void find_lno(const char *line, struct emit_callback *ecbdata)
1191 {
1192 const char *p;
1193 ecbdata->lno_in_preimage = 0;
1194 ecbdata->lno_in_postimage = 0;
1195 p = strchr(line, '-');
1196 if (!p)
1197 return; /* cannot happen */
1198 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1199 p = strchr(p, '+');
1200 if (!p)
1201 return; /* cannot happen */
1202 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1203 }
1204
1205 static void fn_out_consume(void *priv, char *line, unsigned long len)
1206 {
1207 struct emit_callback *ecbdata = priv;
1208 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1209 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1210 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1211 struct diff_options *o = ecbdata->opt;
1212 const char *line_prefix = diff_line_prefix(o);
1213
1214 if (ecbdata->header) {
1215 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1216 strbuf_reset(ecbdata->header);
1217 ecbdata->header = NULL;
1218 }
1219 *(ecbdata->found_changesp) = 1;
1220
1221 if (ecbdata->label_path[0]) {
1222 const char *name_a_tab, *name_b_tab;
1223
1224 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1225 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1226
1227 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1228 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1229 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1230 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1231 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1232 }
1233
1234 if (diff_suppress_blank_empty
1235 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1236 line[0] = '\n';
1237 len = 1;
1238 }
1239
1240 if (line[0] == '@') {
1241 if (ecbdata->diff_words)
1242 diff_words_flush(ecbdata);
1243 len = sane_truncate_line(ecbdata, line, len);
1244 find_lno(line, ecbdata);
1245 emit_hunk_header(ecbdata, line, len);
1246 if (line[len-1] != '\n')
1247 putc('\n', ecbdata->opt->file);
1248 return;
1249 }
1250
1251 if (len < 1) {
1252 emit_line(ecbdata->opt, reset, reset, line, len);
1253 if (ecbdata->diff_words
1254 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1255 fputs("~\n", ecbdata->opt->file);
1256 return;
1257 }
1258
1259 if (ecbdata->diff_words) {
1260 if (line[0] == '-') {
1261 diff_words_append(line, len,
1262 &ecbdata->diff_words->minus);
1263 return;
1264 } else if (line[0] == '+') {
1265 diff_words_append(line, len,
1266 &ecbdata->diff_words->plus);
1267 return;
1268 } else if (starts_with(line, "\\ ")) {
1269 /*
1270 * Eat the "no newline at eof" marker as if we
1271 * saw a "+" or "-" line with nothing on it,
1272 * and return without diff_words_flush() to
1273 * defer processing. If this is the end of
1274 * preimage, more "+" lines may come after it.
1275 */
1276 return;
1277 }
1278 diff_words_flush(ecbdata);
1279 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1280 emit_line(ecbdata->opt, context, reset, line, len);
1281 fputs("~\n", ecbdata->opt->file);
1282 } else {
1283 /*
1284 * Skip the prefix character, if any. With
1285 * diff_suppress_blank_empty, there may be
1286 * none.
1287 */
1288 if (line[0] != '\n') {
1289 line++;
1290 len--;
1291 }
1292 emit_line(ecbdata->opt, context, reset, line, len);
1293 }
1294 return;
1295 }
1296
1297 switch (line[0]) {
1298 case '+':
1299 ecbdata->lno_in_postimage++;
1300 emit_add_line(reset, ecbdata, line + 1, len - 1);
1301 break;
1302 case '-':
1303 ecbdata->lno_in_preimage++;
1304 emit_del_line(reset, ecbdata, line + 1, len - 1);
1305 break;
1306 case ' ':
1307 ecbdata->lno_in_postimage++;
1308 ecbdata->lno_in_preimage++;
1309 emit_context_line(reset, ecbdata, line + 1, len - 1);
1310 break;
1311 default:
1312 /* incomplete line at the end */
1313 ecbdata->lno_in_preimage++;
1314 emit_line(ecbdata->opt,
1315 diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1316 reset, line, len);
1317 break;
1318 }
1319 }
1320
1321 static char *pprint_rename(const char *a, const char *b)
1322 {
1323 const char *old = a;
1324 const char *new = b;
1325 struct strbuf name = STRBUF_INIT;
1326 int pfx_length, sfx_length;
1327 int pfx_adjust_for_slash;
1328 int len_a = strlen(a);
1329 int len_b = strlen(b);
1330 int a_midlen, b_midlen;
1331 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1332 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1333
1334 if (qlen_a || qlen_b) {
1335 quote_c_style(a, &name, NULL, 0);
1336 strbuf_addstr(&name, " => ");
1337 quote_c_style(b, &name, NULL, 0);
1338 return strbuf_detach(&name, NULL);
1339 }
1340
1341 /* Find common prefix */
1342 pfx_length = 0;
1343 while (*old && *new && *old == *new) {
1344 if (*old == '/')
1345 pfx_length = old - a + 1;
1346 old++;
1347 new++;
1348 }
1349
1350 /* Find common suffix */
1351 old = a + len_a;
1352 new = b + len_b;
1353 sfx_length = 0;
1354 /*
1355 * If there is a common prefix, it must end in a slash. In
1356 * that case we let this loop run 1 into the prefix to see the
1357 * same slash.
1358 *
1359 * If there is no common prefix, we cannot do this as it would
1360 * underrun the input strings.
1361 */
1362 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1363 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1364 b + pfx_length - pfx_adjust_for_slash <= new &&
1365 *old == *new) {
1366 if (*old == '/')
1367 sfx_length = len_a - (old - a);
1368 old--;
1369 new--;
1370 }
1371
1372 /*
1373 * pfx{mid-a => mid-b}sfx
1374 * {pfx-a => pfx-b}sfx
1375 * pfx{sfx-a => sfx-b}
1376 * name-a => name-b
1377 */
1378 a_midlen = len_a - pfx_length - sfx_length;
1379 b_midlen = len_b - pfx_length - sfx_length;
1380 if (a_midlen < 0)
1381 a_midlen = 0;
1382 if (b_midlen < 0)
1383 b_midlen = 0;
1384
1385 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1386 if (pfx_length + sfx_length) {
1387 strbuf_add(&name, a, pfx_length);
1388 strbuf_addch(&name, '{');
1389 }
1390 strbuf_add(&name, a + pfx_length, a_midlen);
1391 strbuf_addstr(&name, " => ");
1392 strbuf_add(&name, b + pfx_length, b_midlen);
1393 if (pfx_length + sfx_length) {
1394 strbuf_addch(&name, '}');
1395 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1396 }
1397 return strbuf_detach(&name, NULL);
1398 }
1399
1400 struct diffstat_t {
1401 int nr;
1402 int alloc;
1403 struct diffstat_file {
1404 char *from_name;
1405 char *name;
1406 char *print_name;
1407 unsigned is_unmerged:1;
1408 unsigned is_binary:1;
1409 unsigned is_renamed:1;
1410 unsigned is_interesting:1;
1411 uintmax_t added, deleted;
1412 } **files;
1413 };
1414
1415 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1416 const char *name_a,
1417 const char *name_b)
1418 {
1419 struct diffstat_file *x;
1420 x = xcalloc(1, sizeof(*x));
1421 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1422 diffstat->files[diffstat->nr++] = x;
1423 if (name_b) {
1424 x->from_name = xstrdup(name_a);
1425 x->name = xstrdup(name_b);
1426 x->is_renamed = 1;
1427 }
1428 else {
1429 x->from_name = NULL;
1430 x->name = xstrdup(name_a);
1431 }
1432 return x;
1433 }
1434
1435 static void diffstat_consume(void *priv, char *line, unsigned long len)
1436 {
1437 struct diffstat_t *diffstat = priv;
1438 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1439
1440 if (line[0] == '+')
1441 x->added++;
1442 else if (line[0] == '-')
1443 x->deleted++;
1444 }
1445
1446 const char mime_boundary_leader[] = "------------";
1447
1448 static int scale_linear(int it, int width, int max_change)
1449 {
1450 if (!it)
1451 return 0;
1452 /*
1453 * make sure that at least one '-' or '+' is printed if
1454 * there is any change to this path. The easiest way is to
1455 * scale linearly as if the alloted width is one column shorter
1456 * than it is, and then add 1 to the result.
1457 */
1458 return 1 + (it * (width - 1) / max_change);
1459 }
1460
1461 static void show_name(FILE *file,
1462 const char *prefix, const char *name, int len)
1463 {
1464 fprintf(file, " %s%-*s |", prefix, len, name);
1465 }
1466
1467 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1468 {
1469 if (cnt <= 0)
1470 return;
1471 fprintf(file, "%s", set);
1472 while (cnt--)
1473 putc(ch, file);
1474 fprintf(file, "%s", reset);
1475 }
1476
1477 static void fill_print_name(struct diffstat_file *file)
1478 {
1479 char *pname;
1480
1481 if (file->print_name)
1482 return;
1483
1484 if (!file->is_renamed) {
1485 struct strbuf buf = STRBUF_INIT;
1486 if (quote_c_style(file->name, &buf, NULL, 0)) {
1487 pname = strbuf_detach(&buf, NULL);
1488 } else {
1489 pname = file->name;
1490 strbuf_release(&buf);
1491 }
1492 } else {
1493 pname = pprint_rename(file->from_name, file->name);
1494 }
1495 file->print_name = pname;
1496 }
1497
1498 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1499 {
1500 struct strbuf sb = STRBUF_INIT;
1501 int ret;
1502
1503 if (!files) {
1504 assert(insertions == 0 && deletions == 0);
1505 return fprintf(fp, "%s\n", " 0 files changed");
1506 }
1507
1508 strbuf_addf(&sb,
1509 (files == 1) ? " %d file changed" : " %d files changed",
1510 files);
1511
1512 /*
1513 * For binary diff, the caller may want to print "x files
1514 * changed" with insertions == 0 && deletions == 0.
1515 *
1516 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1517 * is probably less confusing (i.e skip over "2 files changed
1518 * but nothing about added/removed lines? Is this a bug in Git?").
1519 */
1520 if (insertions || deletions == 0) {
1521 strbuf_addf(&sb,
1522 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1523 insertions);
1524 }
1525
1526 if (deletions || insertions == 0) {
1527 strbuf_addf(&sb,
1528 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1529 deletions);
1530 }
1531 strbuf_addch(&sb, '\n');
1532 ret = fputs(sb.buf, fp);
1533 strbuf_release(&sb);
1534 return ret;
1535 }
1536
1537 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1538 {
1539 int i, len, add, del, adds = 0, dels = 0;
1540 uintmax_t max_change = 0, max_len = 0;
1541 int total_files = data->nr, count;
1542 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1543 const char *reset, *add_c, *del_c;
1544 const char *line_prefix = "";
1545 int extra_shown = 0;
1546
1547 if (data->nr == 0)
1548 return;
1549
1550 line_prefix = diff_line_prefix(options);
1551 count = options->stat_count ? options->stat_count : data->nr;
1552
1553 reset = diff_get_color_opt(options, DIFF_RESET);
1554 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1555 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1556
1557 /*
1558 * Find the longest filename and max number of changes
1559 */
1560 for (i = 0; (i < count) && (i < data->nr); i++) {
1561 struct diffstat_file *file = data->files[i];
1562 uintmax_t change = file->added + file->deleted;
1563
1564 if (!file->is_interesting && (change == 0)) {
1565 count++; /* not shown == room for one more */
1566 continue;
1567 }
1568 fill_print_name(file);
1569 len = strlen(file->print_name);
1570 if (max_len < len)
1571 max_len = len;
1572
1573 if (file->is_unmerged) {
1574 /* "Unmerged" is 8 characters */
1575 bin_width = bin_width < 8 ? 8 : bin_width;
1576 continue;
1577 }
1578 if (file->is_binary) {
1579 /* "Bin XXX -> YYY bytes" */
1580 int w = 14 + decimal_width(file->added)
1581 + decimal_width(file->deleted);
1582 bin_width = bin_width < w ? w : bin_width;
1583 /* Display change counts aligned with "Bin" */
1584 number_width = 3;
1585 continue;
1586 }
1587
1588 if (max_change < change)
1589 max_change = change;
1590 }
1591 count = i; /* where we can stop scanning in data->files[] */
1592
1593 /*
1594 * We have width = stat_width or term_columns() columns total.
1595 * We want a maximum of min(max_len, stat_name_width) for the name part.
1596 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1597 * We also need 1 for " " and 4 + decimal_width(max_change)
1598 * for " | NNNN " and one the empty column at the end, altogether
1599 * 6 + decimal_width(max_change).
1600 *
1601 * If there's not enough space, we will use the smaller of
1602 * stat_name_width (if set) and 5/8*width for the filename,
1603 * and the rest for constant elements + graph part, but no more
1604 * than stat_graph_width for the graph part.
1605 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1606 * for the standard terminal size).
1607 *
1608 * In other words: stat_width limits the maximum width, and
1609 * stat_name_width fixes the maximum width of the filename,
1610 * and is also used to divide available columns if there
1611 * aren't enough.
1612 *
1613 * Binary files are displayed with "Bin XXX -> YYY bytes"
1614 * instead of the change count and graph. This part is treated
1615 * similarly to the graph part, except that it is not
1616 * "scaled". If total width is too small to accommodate the
1617 * guaranteed minimum width of the filename part and the
1618 * separators and this message, this message will "overflow"
1619 * making the line longer than the maximum width.
1620 */
1621
1622 if (options->stat_width == -1)
1623 width = term_columns() - options->output_prefix_length;
1624 else
1625 width = options->stat_width ? options->stat_width : 80;
1626 number_width = decimal_width(max_change) > number_width ?
1627 decimal_width(max_change) : number_width;
1628
1629 if (options->stat_graph_width == -1)
1630 options->stat_graph_width = diff_stat_graph_width;
1631
1632 /*
1633 * Guarantee 3/8*16==6 for the graph part
1634 * and 5/8*16==10 for the filename part
1635 */
1636 if (width < 16 + 6 + number_width)
1637 width = 16 + 6 + number_width;
1638
1639 /*
1640 * First assign sizes that are wanted, ignoring available width.
1641 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1642 * starting from "XXX" should fit in graph_width.
1643 */
1644 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1645 if (options->stat_graph_width &&
1646 options->stat_graph_width < graph_width)
1647 graph_width = options->stat_graph_width;
1648
1649 name_width = (options->stat_name_width > 0 &&
1650 options->stat_name_width < max_len) ?
1651 options->stat_name_width : max_len;
1652
1653 /*
1654 * Adjust adjustable widths not to exceed maximum width
1655 */
1656 if (name_width + number_width + 6 + graph_width > width) {
1657 if (graph_width > width * 3/8 - number_width - 6) {
1658 graph_width = width * 3/8 - number_width - 6;
1659 if (graph_width < 6)
1660 graph_width = 6;
1661 }
1662
1663 if (options->stat_graph_width &&
1664 graph_width > options->stat_graph_width)
1665 graph_width = options->stat_graph_width;
1666 if (name_width > width - number_width - 6 - graph_width)
1667 name_width = width - number_width - 6 - graph_width;
1668 else
1669 graph_width = width - number_width - 6 - name_width;
1670 }
1671
1672 /*
1673 * From here name_width is the width of the name area,
1674 * and graph_width is the width of the graph area.
1675 * max_change is used to scale graph properly.
1676 */
1677 for (i = 0; i < count; i++) {
1678 const char *prefix = "";
1679 struct diffstat_file *file = data->files[i];
1680 char *name = file->print_name;
1681 uintmax_t added = file->added;
1682 uintmax_t deleted = file->deleted;
1683 int name_len;
1684
1685 if (!file->is_interesting && (added + deleted == 0))
1686 continue;
1687
1688 /*
1689 * "scale" the filename
1690 */
1691 len = name_width;
1692 name_len = strlen(name);
1693 if (name_width < name_len) {
1694 char *slash;
1695 prefix = "...";
1696 len -= 3;
1697 name += name_len - len;
1698 slash = strchr(name, '/');
1699 if (slash)
1700 name = slash;
1701 }
1702
1703 if (file->is_binary) {
1704 fprintf(options->file, "%s", line_prefix);
1705 show_name(options->file, prefix, name, len);
1706 fprintf(options->file, " %*s", number_width, "Bin");
1707 if (!added && !deleted) {
1708 putc('\n', options->file);
1709 continue;
1710 }
1711 fprintf(options->file, " %s%"PRIuMAX"%s",
1712 del_c, deleted, reset);
1713 fprintf(options->file, " -> ");
1714 fprintf(options->file, "%s%"PRIuMAX"%s",
1715 add_c, added, reset);
1716 fprintf(options->file, " bytes");
1717 fprintf(options->file, "\n");
1718 continue;
1719 }
1720 else if (file->is_unmerged) {
1721 fprintf(options->file, "%s", line_prefix);
1722 show_name(options->file, prefix, name, len);
1723 fprintf(options->file, " Unmerged\n");
1724 continue;
1725 }
1726
1727 /*
1728 * scale the add/delete
1729 */
1730 add = added;
1731 del = deleted;
1732
1733 if (graph_width <= max_change) {
1734 int total = scale_linear(add + del, graph_width, max_change);
1735 if (total < 2 && add && del)
1736 /* width >= 2 due to the sanity check */
1737 total = 2;
1738 if (add < del) {
1739 add = scale_linear(add, graph_width, max_change);
1740 del = total - add;
1741 } else {
1742 del = scale_linear(del, graph_width, max_change);
1743 add = total - del;
1744 }
1745 }
1746 fprintf(options->file, "%s", line_prefix);
1747 show_name(options->file, prefix, name, len);
1748 fprintf(options->file, " %*"PRIuMAX"%s",
1749 number_width, added + deleted,
1750 added + deleted ? " " : "");
1751 show_graph(options->file, '+', add, add_c, reset);
1752 show_graph(options->file, '-', del, del_c, reset);
1753 fprintf(options->file, "\n");
1754 }
1755
1756 for (i = 0; i < data->nr; i++) {
1757 struct diffstat_file *file = data->files[i];
1758 uintmax_t added = file->added;
1759 uintmax_t deleted = file->deleted;
1760
1761 if (file->is_unmerged ||
1762 (!file->is_interesting && (added + deleted == 0))) {
1763 total_files--;
1764 continue;
1765 }
1766
1767 if (!file->is_binary) {
1768 adds += added;
1769 dels += deleted;
1770 }
1771 if (i < count)
1772 continue;
1773 if (!extra_shown)
1774 fprintf(options->file, "%s ...\n", line_prefix);
1775 extra_shown = 1;
1776 }
1777 fprintf(options->file, "%s", line_prefix);
1778 print_stat_summary(options->file, total_files, adds, dels);
1779 }
1780
1781 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1782 {
1783 int i, adds = 0, dels = 0, total_files = data->nr;
1784
1785 if (data->nr == 0)
1786 return;
1787
1788 for (i = 0; i < data->nr; i++) {
1789 int added = data->files[i]->added;
1790 int deleted= data->files[i]->deleted;
1791
1792 if (data->files[i]->is_unmerged ||
1793 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1794 total_files--;
1795 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1796 adds += added;
1797 dels += deleted;
1798 }
1799 }
1800 fprintf(options->file, "%s", diff_line_prefix(options));
1801 print_stat_summary(options->file, total_files, adds, dels);
1802 }
1803
1804 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1805 {
1806 int i;
1807
1808 if (data->nr == 0)
1809 return;
1810
1811 for (i = 0; i < data->nr; i++) {
1812 struct diffstat_file *file = data->files[i];
1813
1814 fprintf(options->file, "%s", diff_line_prefix(options));
1815
1816 if (file->is_binary)
1817 fprintf(options->file, "-\t-\t");
1818 else
1819 fprintf(options->file,
1820 "%"PRIuMAX"\t%"PRIuMAX"\t",
1821 file->added, file->deleted);
1822 if (options->line_termination) {
1823 fill_print_name(file);
1824 if (!file->is_renamed)
1825 write_name_quoted(file->name, options->file,
1826 options->line_termination);
1827 else {
1828 fputs(file->print_name, options->file);
1829 putc(options->line_termination, options->file);
1830 }
1831 } else {
1832 if (file->is_renamed) {
1833 putc('\0', options->file);
1834 write_name_quoted(file->from_name, options->file, '\0');
1835 }
1836 write_name_quoted(file->name, options->file, '\0');
1837 }
1838 }
1839 }
1840
1841 struct dirstat_file {
1842 const char *name;
1843 unsigned long changed;
1844 };
1845
1846 struct dirstat_dir {
1847 struct dirstat_file *files;
1848 int alloc, nr, permille, cumulative;
1849 };
1850
1851 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1852 unsigned long changed, const char *base, int baselen)
1853 {
1854 unsigned long this_dir = 0;
1855 unsigned int sources = 0;
1856 const char *line_prefix = diff_line_prefix(opt);
1857
1858 while (dir->nr) {
1859 struct dirstat_file *f = dir->files;
1860 int namelen = strlen(f->name);
1861 unsigned long this;
1862 char *slash;
1863
1864 if (namelen < baselen)
1865 break;
1866 if (memcmp(f->name, base, baselen))
1867 break;
1868 slash = strchr(f->name + baselen, '/');
1869 if (slash) {
1870 int newbaselen = slash + 1 - f->name;
1871 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1872 sources++;
1873 } else {
1874 this = f->changed;
1875 dir->files++;
1876 dir->nr--;
1877 sources += 2;
1878 }
1879 this_dir += this;
1880 }
1881
1882 /*
1883 * We don't report dirstat's for
1884 * - the top level
1885 * - or cases where everything came from a single directory
1886 * under this directory (sources == 1).
1887 */
1888 if (baselen && sources != 1) {
1889 if (this_dir) {
1890 int permille = this_dir * 1000 / changed;
1891 if (permille >= dir->permille) {
1892 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1893 permille / 10, permille % 10, baselen, base);
1894 if (!dir->cumulative)
1895 return 0;
1896 }
1897 }
1898 }
1899 return this_dir;
1900 }
1901
1902 static int dirstat_compare(const void *_a, const void *_b)
1903 {
1904 const struct dirstat_file *a = _a;
1905 const struct dirstat_file *b = _b;
1906 return strcmp(a->name, b->name);
1907 }
1908
1909 static void show_dirstat(struct diff_options *options)
1910 {
1911 int i;
1912 unsigned long changed;
1913 struct dirstat_dir dir;
1914 struct diff_queue_struct *q = &diff_queued_diff;
1915
1916 dir.files = NULL;
1917 dir.alloc = 0;
1918 dir.nr = 0;
1919 dir.permille = options->dirstat_permille;
1920 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1921
1922 changed = 0;
1923 for (i = 0; i < q->nr; i++) {
1924 struct diff_filepair *p = q->queue[i];
1925 const char *name;
1926 unsigned long copied, added, damage;
1927 int content_changed;
1928
1929 name = p->two->path ? p->two->path : p->one->path;
1930
1931 if (p->one->sha1_valid && p->two->sha1_valid)
1932 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1933 else
1934 content_changed = 1;
1935
1936 if (!content_changed) {
1937 /*
1938 * The SHA1 has not changed, so pre-/post-content is
1939 * identical. We can therefore skip looking at the
1940 * file contents altogether.
1941 */
1942 damage = 0;
1943 goto found_damage;
1944 }
1945
1946 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1947 /*
1948 * In --dirstat-by-file mode, we don't really need to
1949 * look at the actual file contents at all.
1950 * The fact that the SHA1 changed is enough for us to
1951 * add this file to the list of results
1952 * (with each file contributing equal damage).
1953 */
1954 damage = 1;
1955 goto found_damage;
1956 }
1957
1958 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1959 diff_populate_filespec(p->one, 0);
1960 diff_populate_filespec(p->two, 0);
1961 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1962 &copied, &added);
1963 diff_free_filespec_data(p->one);
1964 diff_free_filespec_data(p->two);
1965 } else if (DIFF_FILE_VALID(p->one)) {
1966 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1967 copied = added = 0;
1968 diff_free_filespec_data(p->one);
1969 } else if (DIFF_FILE_VALID(p->two)) {
1970 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1971 copied = 0;
1972 added = p->two->size;
1973 diff_free_filespec_data(p->two);
1974 } else
1975 continue;
1976
1977 /*
1978 * Original minus copied is the removed material,
1979 * added is the new material. They are both damages
1980 * made to the preimage.
1981 * If the resulting damage is zero, we know that
1982 * diffcore_count_changes() considers the two entries to
1983 * be identical, but since content_changed is true, we
1984 * know that there must have been _some_ kind of change,
1985 * so we force all entries to have damage > 0.
1986 */
1987 damage = (p->one->size - copied) + added;
1988 if (!damage)
1989 damage = 1;
1990
1991 found_damage:
1992 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1993 dir.files[dir.nr].name = name;
1994 dir.files[dir.nr].changed = damage;
1995 changed += damage;
1996 dir.nr++;
1997 }
1998
1999 /* This can happen even with many files, if everything was renames */
2000 if (!changed)
2001 return;
2002
2003 /* Show all directories with more than x% of the changes */
2004 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2005 gather_dirstat(options, &dir, changed, "", 0);
2006 }
2007
2008 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2009 {
2010 int i;
2011 unsigned long changed;
2012 struct dirstat_dir dir;
2013
2014 if (data->nr == 0)
2015 return;
2016
2017 dir.files = NULL;
2018 dir.alloc = 0;
2019 dir.nr = 0;
2020 dir.permille = options->dirstat_permille;
2021 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2022
2023 changed = 0;
2024 for (i = 0; i < data->nr; i++) {
2025 struct diffstat_file *file = data->files[i];
2026 unsigned long damage = file->added + file->deleted;
2027 if (file->is_binary)
2028 /*
2029 * binary files counts bytes, not lines. Must find some
2030 * way to normalize binary bytes vs. textual lines.
2031 * The following heuristic assumes that there are 64
2032 * bytes per "line".
2033 * This is stupid and ugly, but very cheap...
2034 */
2035 damage = (damage + 63) / 64;
2036 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2037 dir.files[dir.nr].name = file->name;
2038 dir.files[dir.nr].changed = damage;
2039 changed += damage;
2040 dir.nr++;
2041 }
2042
2043 /* This can happen even with many files, if everything was renames */
2044 if (!changed)
2045 return;
2046
2047 /* Show all directories with more than x% of the changes */
2048 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2049 gather_dirstat(options, &dir, changed, "", 0);
2050 }
2051
2052 static void free_diffstat_info(struct diffstat_t *diffstat)
2053 {
2054 int i;
2055 for (i = 0; i < diffstat->nr; i++) {
2056 struct diffstat_file *f = diffstat->files[i];
2057 if (f->name != f->print_name)
2058 free(f->print_name);
2059 free(f->name);
2060 free(f->from_name);
2061 free(f);
2062 }
2063 free(diffstat->files);
2064 }
2065
2066 struct checkdiff_t {
2067 const char *filename;
2068 int lineno;
2069 int conflict_marker_size;
2070 struct diff_options *o;
2071 unsigned ws_rule;
2072 unsigned status;
2073 };
2074
2075 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2076 {
2077 char firstchar;
2078 int cnt;
2079
2080 if (len < marker_size + 1)
2081 return 0;
2082 firstchar = line[0];
2083 switch (firstchar) {
2084 case '=': case '>': case '<': case '|':
2085 break;
2086 default:
2087 return 0;
2088 }
2089 for (cnt = 1; cnt < marker_size; cnt++)
2090 if (line[cnt] != firstchar)
2091 return 0;
2092 /* line[1] thru line[marker_size-1] are same as firstchar */
2093 if (len < marker_size + 1 || !isspace(line[marker_size]))
2094 return 0;
2095 return 1;
2096 }
2097
2098 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2099 {
2100 struct checkdiff_t *data = priv;
2101 int marker_size = data->conflict_marker_size;
2102 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2103 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2104 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2105 char *err;
2106 const char *line_prefix;
2107
2108 assert(data->o);
2109 line_prefix = diff_line_prefix(data->o);
2110
2111 if (line[0] == '+') {
2112 unsigned bad;
2113 data->lineno++;
2114 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2115 data->status |= 1;
2116 fprintf(data->o->file,
2117 "%s%s:%d: leftover conflict marker\n",
2118 line_prefix, data->filename, data->lineno);
2119 }
2120 bad = ws_check(line + 1, len - 1, data->ws_rule);
2121 if (!bad)
2122 return;
2123 data->status |= bad;
2124 err = whitespace_error_string(bad);
2125 fprintf(data->o->file, "%s%s:%d: %s.\n",
2126 line_prefix, data->filename, data->lineno, err);
2127 free(err);
2128 emit_line(data->o, set, reset, line, 1);
2129 ws_check_emit(line + 1, len - 1, data->ws_rule,
2130 data->o->file, set, reset, ws);
2131 } else if (line[0] == ' ') {
2132 data->lineno++;
2133 } else if (line[0] == '@') {
2134 char *plus = strchr(line, '+');
2135 if (plus)
2136 data->lineno = strtol(plus, NULL, 10) - 1;
2137 else
2138 die("invalid diff");
2139 }
2140 }
2141
2142 static unsigned char *deflate_it(char *data,
2143 unsigned long size,
2144 unsigned long *result_size)
2145 {
2146 int bound;
2147 unsigned char *deflated;
2148 git_zstream stream;
2149
2150 git_deflate_init(&stream, zlib_compression_level);
2151 bound = git_deflate_bound(&stream, size);
2152 deflated = xmalloc(bound);
2153 stream.next_out = deflated;
2154 stream.avail_out = bound;
2155
2156 stream.next_in = (unsigned char *)data;
2157 stream.avail_in = size;
2158 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2159 ; /* nothing */
2160 git_deflate_end(&stream);
2161 *result_size = stream.total_out;
2162 return deflated;
2163 }
2164
2165 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2166 const char *prefix)
2167 {
2168 void *cp;
2169 void *delta;
2170 void *deflated;
2171 void *data;
2172 unsigned long orig_size;
2173 unsigned long delta_size;
2174 unsigned long deflate_size;
2175 unsigned long data_size;
2176
2177 /* We could do deflated delta, or we could do just deflated two,
2178 * whichever is smaller.
2179 */
2180 delta = NULL;
2181 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2182 if (one->size && two->size) {
2183 delta = diff_delta(one->ptr, one->size,
2184 two->ptr, two->size,
2185 &delta_size, deflate_size);
2186 if (delta) {
2187 void *to_free = delta;
2188 orig_size = delta_size;
2189 delta = deflate_it(delta, delta_size, &delta_size);
2190 free(to_free);
2191 }
2192 }
2193
2194 if (delta && delta_size < deflate_size) {
2195 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2196 free(deflated);
2197 data = delta;
2198 data_size = delta_size;
2199 }
2200 else {
2201 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2202 free(delta);
2203 data = deflated;
2204 data_size = deflate_size;
2205 }
2206
2207 /* emit data encoded in base85 */
2208 cp = data;
2209 while (data_size) {
2210 int bytes = (52 < data_size) ? 52 : data_size;
2211 char line[70];
2212 data_size -= bytes;
2213 if (bytes <= 26)
2214 line[0] = bytes + 'A' - 1;
2215 else
2216 line[0] = bytes - 26 + 'a' - 1;
2217 encode_85(line + 1, cp, bytes);
2218 cp = (char *) cp + bytes;
2219 fprintf(file, "%s", prefix);
2220 fputs(line, file);
2221 fputc('\n', file);
2222 }
2223 fprintf(file, "%s\n", prefix);
2224 free(data);
2225 }
2226
2227 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2228 const char *prefix)
2229 {
2230 fprintf(file, "%sGIT binary patch\n", prefix);
2231 emit_binary_diff_body(file, one, two, prefix);
2232 emit_binary_diff_body(file, two, one, prefix);
2233 }
2234
2235 int diff_filespec_is_binary(struct diff_filespec *one)
2236 {
2237 if (one->is_binary == -1) {
2238 diff_filespec_load_driver(one);
2239 if (one->driver->binary != -1)
2240 one->is_binary = one->driver->binary;
2241 else {
2242 if (!one->data && DIFF_FILE_VALID(one))
2243 diff_populate_filespec(one, CHECK_BINARY);
2244 if (one->is_binary == -1 && one->data)
2245 one->is_binary = buffer_is_binary(one->data,
2246 one->size);
2247 if (one->is_binary == -1)
2248 one->is_binary = 0;
2249 }
2250 }
2251 return one->is_binary;
2252 }
2253
2254 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2255 {
2256 diff_filespec_load_driver(one);
2257 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2258 }
2259
2260 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2261 {
2262 if (!options->a_prefix)
2263 options->a_prefix = a;
2264 if (!options->b_prefix)
2265 options->b_prefix = b;
2266 }
2267
2268 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2269 {
2270 if (!DIFF_FILE_VALID(one))
2271 return NULL;
2272
2273 diff_filespec_load_driver(one);
2274 return userdiff_get_textconv(one->driver);
2275 }
2276
2277 static void builtin_diff(const char *name_a,
2278 const char *name_b,
2279 struct diff_filespec *one,
2280 struct diff_filespec *two,
2281 const char *xfrm_msg,
2282 int must_show_header,
2283 struct diff_options *o,
2284 int complete_rewrite)
2285 {
2286 mmfile_t mf1, mf2;
2287 const char *lbl[2];
2288 char *a_one, *b_two;
2289 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2290 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2291 const char *a_prefix, *b_prefix;
2292 struct userdiff_driver *textconv_one = NULL;
2293 struct userdiff_driver *textconv_two = NULL;
2294 struct strbuf header = STRBUF_INIT;
2295 const char *line_prefix = diff_line_prefix(o);
2296
2297 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2298 (!one->mode || S_ISGITLINK(one->mode)) &&
2299 (!two->mode || S_ISGITLINK(two->mode))) {
2300 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2301 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2302 show_submodule_summary(o->file, one->path ? one->path : two->path,
2303 line_prefix,
2304 one->sha1, two->sha1, two->dirty_submodule,
2305 meta, del, add, reset);
2306 return;
2307 }
2308
2309 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2310 textconv_one = get_textconv(one);
2311 textconv_two = get_textconv(two);
2312 }
2313
2314 diff_set_mnemonic_prefix(o, "a/", "b/");
2315 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2316 a_prefix = o->b_prefix;
2317 b_prefix = o->a_prefix;
2318 } else {
2319 a_prefix = o->a_prefix;
2320 b_prefix = o->b_prefix;
2321 }
2322
2323 /* Never use a non-valid filename anywhere if at all possible */
2324 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2325 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2326
2327 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2328 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2329 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2330 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2331 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2332 if (lbl[0][0] == '/') {
2333 /* /dev/null */
2334 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2335 if (xfrm_msg)
2336 strbuf_addstr(&header, xfrm_msg);
2337 must_show_header = 1;
2338 }
2339 else if (lbl[1][0] == '/') {
2340 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2341 if (xfrm_msg)
2342 strbuf_addstr(&header, xfrm_msg);
2343 must_show_header = 1;
2344 }
2345 else {
2346 if (one->mode != two->mode) {
2347 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2348 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2349 must_show_header = 1;
2350 }
2351 if (xfrm_msg)
2352 strbuf_addstr(&header, xfrm_msg);
2353
2354 /*
2355 * we do not run diff between different kind
2356 * of objects.
2357 */
2358 if ((one->mode ^ two->mode) & S_IFMT)
2359 goto free_ab_and_return;
2360 if (complete_rewrite &&
2361 (textconv_one || !diff_filespec_is_binary(one)) &&
2362 (textconv_two || !diff_filespec_is_binary(two))) {
2363 fprintf(o->file, "%s", header.buf);
2364 strbuf_reset(&header);
2365 emit_rewrite_diff(name_a, name_b, one, two,
2366 textconv_one, textconv_two, o);
2367 o->found_changes = 1;
2368 goto free_ab_and_return;
2369 }
2370 }
2371
2372 if (o->irreversible_delete && lbl[1][0] == '/') {
2373 fprintf(o->file, "%s", header.buf);
2374 strbuf_reset(&header);
2375 goto free_ab_and_return;
2376 } else if (!DIFF_OPT_TST(o, TEXT) &&
2377 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2378 (!textconv_two && diff_filespec_is_binary(two)) )) {
2379 if (!one->data && !two->data &&
2380 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2381 !DIFF_OPT_TST(o, BINARY)) {
2382 if (!hashcmp(one->sha1, two->sha1)) {
2383 if (must_show_header)
2384 fprintf(o->file, "%s", header.buf);
2385 goto free_ab_and_return;
2386 }
2387 fprintf(o->file, "%s", header.buf);
2388 fprintf(o->file, "%sBinary files %s and %s differ\n",
2389 line_prefix, lbl[0], lbl[1]);
2390 goto free_ab_and_return;
2391 }
2392 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2393 die("unable to read files to diff");
2394 /* Quite common confusing case */
2395 if (mf1.size == mf2.size &&
2396 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2397 if (must_show_header)
2398 fprintf(o->file, "%s", header.buf);
2399 goto free_ab_and_return;
2400 }
2401 fprintf(o->file, "%s", header.buf);
2402 strbuf_reset(&header);
2403 if (DIFF_OPT_TST(o, BINARY))
2404 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2405 else
2406 fprintf(o->file, "%sBinary files %s and %s differ\n",
2407 line_prefix, lbl[0], lbl[1]);
2408 o->found_changes = 1;
2409 } else {
2410 /* Crazy xdl interfaces.. */
2411 const char *diffopts = getenv("GIT_DIFF_OPTS");
2412 const char *v;
2413 xpparam_t xpp;
2414 xdemitconf_t xecfg;
2415 struct emit_callback ecbdata;
2416 const struct userdiff_funcname *pe;
2417
2418 if (must_show_header) {
2419 fprintf(o->file, "%s", header.buf);
2420 strbuf_reset(&header);
2421 }
2422
2423 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2424 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2425
2426 pe = diff_funcname_pattern(one);
2427 if (!pe)
2428 pe = diff_funcname_pattern(two);
2429
2430 memset(&xpp, 0, sizeof(xpp));
2431 memset(&xecfg, 0, sizeof(xecfg));
2432 memset(&ecbdata, 0, sizeof(ecbdata));
2433 ecbdata.label_path = lbl;
2434 ecbdata.color_diff = want_color(o->use_color);
2435 ecbdata.found_changesp = &o->found_changes;
2436 ecbdata.ws_rule = whitespace_rule(name_b);
2437 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2438 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2439 ecbdata.opt = o;
2440 ecbdata.header = header.len ? &header : NULL;
2441 xpp.flags = o->xdl_opts;
2442 xecfg.ctxlen = o->context;
2443 xecfg.interhunkctxlen = o->interhunkcontext;
2444 xecfg.flags = XDL_EMIT_FUNCNAMES;
2445 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2446 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2447 if (pe)
2448 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2449 if (!diffopts)
2450 ;
2451 else if (skip_prefix(diffopts, "--unified=", &v))
2452 xecfg.ctxlen = strtoul(v, NULL, 10);
2453 else if (skip_prefix(diffopts, "-u", &v))
2454 xecfg.ctxlen = strtoul(v, NULL, 10);
2455 if (o->word_diff)
2456 init_diff_words_data(&ecbdata, o, one, two);
2457 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2458 &xpp, &xecfg))
2459 die("unable to generate diff for %s", one->path);
2460 if (o->word_diff)
2461 free_diff_words_data(&ecbdata);
2462 if (textconv_one)
2463 free(mf1.ptr);
2464 if (textconv_two)
2465 free(mf2.ptr);
2466 xdiff_clear_find_func(&xecfg);
2467 }
2468
2469 free_ab_and_return:
2470 strbuf_release(&header);
2471 diff_free_filespec_data(one);
2472 diff_free_filespec_data(two);
2473 free(a_one);
2474 free(b_two);
2475 return;
2476 }
2477
2478 static void builtin_diffstat(const char *name_a, const char *name_b,
2479 struct diff_filespec *one,
2480 struct diff_filespec *two,
2481 struct diffstat_t *diffstat,
2482 struct diff_options *o,
2483 struct diff_filepair *p)
2484 {
2485 mmfile_t mf1, mf2;
2486 struct diffstat_file *data;
2487 int same_contents;
2488 int complete_rewrite = 0;
2489
2490 if (!DIFF_PAIR_UNMERGED(p)) {
2491 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2492 complete_rewrite = 1;
2493 }
2494
2495 data = diffstat_add(diffstat, name_a, name_b);
2496 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2497
2498 if (!one || !two) {
2499 data->is_unmerged = 1;
2500 return;
2501 }
2502
2503 same_contents = !hashcmp(one->sha1, two->sha1);
2504
2505 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2506 data->is_binary = 1;
2507 if (same_contents) {
2508 data->added = 0;
2509 data->deleted = 0;
2510 } else {
2511 data->added = diff_filespec_size(two);
2512 data->deleted = diff_filespec_size(one);
2513 }
2514 }
2515
2516 else if (complete_rewrite) {
2517 diff_populate_filespec(one, 0);
2518 diff_populate_filespec(two, 0);
2519 data->deleted = count_lines(one->data, one->size);
2520 data->added = count_lines(two->data, two->size);
2521 }
2522
2523 else if (!same_contents) {
2524 /* Crazy xdl interfaces.. */
2525 xpparam_t xpp;
2526 xdemitconf_t xecfg;
2527
2528 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2529 die("unable to read files to diff");
2530
2531 memset(&xpp, 0, sizeof(xpp));
2532 memset(&xecfg, 0, sizeof(xecfg));
2533 xpp.flags = o->xdl_opts;
2534 xecfg.ctxlen = o->context;
2535 xecfg.interhunkctxlen = o->interhunkcontext;
2536 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2537 &xpp, &xecfg))
2538 die("unable to generate diffstat for %s", one->path);
2539 }
2540
2541 diff_free_filespec_data(one);
2542 diff_free_filespec_data(two);
2543 }
2544
2545 static void builtin_checkdiff(const char *name_a, const char *name_b,
2546 const char *attr_path,
2547 struct diff_filespec *one,
2548 struct diff_filespec *two,
2549 struct diff_options *o)
2550 {
2551 mmfile_t mf1, mf2;
2552 struct checkdiff_t data;
2553
2554 if (!two)
2555 return;
2556
2557 memset(&data, 0, sizeof(data));
2558 data.filename = name_b ? name_b : name_a;
2559 data.lineno = 0;
2560 data.o = o;
2561 data.ws_rule = whitespace_rule(attr_path);
2562 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2563
2564 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2565 die("unable to read files to diff");
2566
2567 /*
2568 * All the other codepaths check both sides, but not checking
2569 * the "old" side here is deliberate. We are checking the newly
2570 * introduced changes, and as long as the "new" side is text, we
2571 * can and should check what it introduces.
2572 */
2573 if (diff_filespec_is_binary(two))
2574 goto free_and_return;
2575 else {
2576 /* Crazy xdl interfaces.. */
2577 xpparam_t xpp;
2578 xdemitconf_t xecfg;
2579
2580 memset(&xpp, 0, sizeof(xpp));
2581 memset(&xecfg, 0, sizeof(xecfg));
2582 xecfg.ctxlen = 1; /* at least one context line */
2583 xpp.flags = 0;
2584 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2585 &xpp, &xecfg))
2586 die("unable to generate checkdiff for %s", one->path);
2587
2588 if (data.ws_rule & WS_BLANK_AT_EOF) {
2589 struct emit_callback ecbdata;
2590 int blank_at_eof;
2591
2592 ecbdata.ws_rule = data.ws_rule;
2593 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2594 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2595
2596 if (blank_at_eof) {
2597 static char *err;
2598 if (!err)
2599 err = whitespace_error_string(WS_BLANK_AT_EOF);
2600 fprintf(o->file, "%s:%d: %s.\n",
2601 data.filename, blank_at_eof, err);
2602 data.status = 1; /* report errors */
2603 }
2604 }
2605 }
2606 free_and_return:
2607 diff_free_filespec_data(one);
2608 diff_free_filespec_data(two);
2609 if (data.status)
2610 DIFF_OPT_SET(o, CHECK_FAILED);
2611 }
2612
2613 struct diff_filespec *alloc_filespec(const char *path)
2614 {
2615 struct diff_filespec *spec;
2616
2617 FLEXPTR_ALLOC_STR(spec, path, path);
2618 spec->count = 1;
2619 spec->is_binary = -1;
2620 return spec;
2621 }
2622
2623 void free_filespec(struct diff_filespec *spec)
2624 {
2625 if (!--spec->count) {
2626 diff_free_filespec_data(spec);
2627 free(spec);
2628 }
2629 }
2630
2631 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2632 int sha1_valid, unsigned short mode)
2633 {
2634 if (mode) {
2635 spec->mode = canon_mode(mode);
2636 hashcpy(spec->sha1, sha1);
2637 spec->sha1_valid = sha1_valid;
2638 }
2639 }
2640
2641 /*
2642 * Given a name and sha1 pair, if the index tells us the file in
2643 * the work tree has that object contents, return true, so that
2644 * prepare_temp_file() does not have to inflate and extract.
2645 */
2646 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2647 {
2648 const struct cache_entry *ce;
2649 struct stat st;
2650 int pos, len;
2651
2652 /*
2653 * We do not read the cache ourselves here, because the
2654 * benchmark with my previous version that always reads cache
2655 * shows that it makes things worse for diff-tree comparing
2656 * two linux-2.6 kernel trees in an already checked out work
2657 * tree. This is because most diff-tree comparisons deal with
2658 * only a small number of files, while reading the cache is
2659 * expensive for a large project, and its cost outweighs the
2660 * savings we get by not inflating the object to a temporary
2661 * file. Practically, this code only helps when we are used
2662 * by diff-cache --cached, which does read the cache before
2663 * calling us.
2664 */
2665 if (!active_cache)
2666 return 0;
2667
2668 /* We want to avoid the working directory if our caller
2669 * doesn't need the data in a normal file, this system
2670 * is rather slow with its stat/open/mmap/close syscalls,
2671 * and the object is contained in a pack file. The pack
2672 * is probably already open and will be faster to obtain
2673 * the data through than the working directory. Loose
2674 * objects however would tend to be slower as they need
2675 * to be individually opened and inflated.
2676 */
2677 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2678 return 0;
2679
2680 len = strlen(name);
2681 pos = cache_name_pos(name, len);
2682 if (pos < 0)
2683 return 0;
2684 ce = active_cache[pos];
2685
2686 /*
2687 * This is not the sha1 we are looking for, or
2688 * unreusable because it is not a regular file.
2689 */
2690 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2691 return 0;
2692
2693 /*
2694 * If ce is marked as "assume unchanged", there is no
2695 * guarantee that work tree matches what we are looking for.
2696 */
2697 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2698 return 0;
2699
2700 /*
2701 * If ce matches the file in the work tree, we can reuse it.
2702 */
2703 if (ce_uptodate(ce) ||
2704 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2705 return 1;
2706
2707 return 0;
2708 }
2709
2710 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2711 {
2712 struct strbuf buf = STRBUF_INIT;
2713 char *dirty = "";
2714
2715 /* Are we looking at the work tree? */
2716 if (s->dirty_submodule)
2717 dirty = "-dirty";
2718
2719 strbuf_addf(&buf, "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2720 s->size = buf.len;
2721 if (size_only) {
2722 s->data = NULL;
2723 strbuf_release(&buf);
2724 } else {
2725 s->data = strbuf_detach(&buf, NULL);
2726 s->should_free = 1;
2727 }
2728 return 0;
2729 }
2730
2731 /*
2732 * While doing rename detection and pickaxe operation, we may need to
2733 * grab the data for the blob (or file) for our own in-core comparison.
2734 * diff_filespec has data and size fields for this purpose.
2735 */
2736 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2737 {
2738 int size_only = flags & CHECK_SIZE_ONLY;
2739 int err = 0;
2740 /*
2741 * demote FAIL to WARN to allow inspecting the situation
2742 * instead of refusing.
2743 */
2744 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2745 ? SAFE_CRLF_WARN
2746 : safe_crlf);
2747
2748 if (!DIFF_FILE_VALID(s))
2749 die("internal error: asking to populate invalid file.");
2750 if (S_ISDIR(s->mode))
2751 return -1;
2752
2753 if (s->data)
2754 return 0;
2755
2756 if (size_only && 0 < s->size)
2757 return 0;
2758
2759 if (S_ISGITLINK(s->mode))
2760 return diff_populate_gitlink(s, size_only);
2761
2762 if (!s->sha1_valid ||
2763 reuse_worktree_file(s->path, s->sha1, 0)) {
2764 struct strbuf buf = STRBUF_INIT;
2765 struct stat st;
2766 int fd;
2767
2768 if (lstat(s->path, &st) < 0) {
2769 if (errno == ENOENT) {
2770 err_empty:
2771 err = -1;
2772 empty:
2773 s->data = (char *)"";
2774 s->size = 0;
2775 return err;
2776 }
2777 }
2778 s->size = xsize_t(st.st_size);
2779 if (!s->size)
2780 goto empty;
2781 if (S_ISLNK(st.st_mode)) {
2782 struct strbuf sb = STRBUF_INIT;
2783
2784 if (strbuf_readlink(&sb, s->path, s->size))
2785 goto err_empty;
2786 s->size = sb.len;
2787 s->data = strbuf_detach(&sb, NULL);
2788 s->should_free = 1;
2789 return 0;
2790 }
2791 if (size_only)
2792 return 0;
2793 if ((flags & CHECK_BINARY) &&
2794 s->size > big_file_threshold && s->is_binary == -1) {
2795 s->is_binary = 1;
2796 return 0;
2797 }
2798 fd = open(s->path, O_RDONLY);
2799 if (fd < 0)
2800 goto err_empty;
2801 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2802 close(fd);
2803 s->should_munmap = 1;
2804
2805 /*
2806 * Convert from working tree format to canonical git format
2807 */
2808 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2809 size_t size = 0;
2810 munmap(s->data, s->size);
2811 s->should_munmap = 0;
2812 s->data = strbuf_detach(&buf, &size);
2813 s->size = size;
2814 s->should_free = 1;
2815 }
2816 }
2817 else {
2818 enum object_type type;
2819 if (size_only || (flags & CHECK_BINARY)) {
2820 type = sha1_object_info(s->sha1, &s->size);
2821 if (type < 0)
2822 die("unable to read %s", sha1_to_hex(s->sha1));
2823 if (size_only)
2824 return 0;
2825 if (s->size > big_file_threshold && s->is_binary == -1) {
2826 s->is_binary = 1;
2827 return 0;
2828 }
2829 }
2830 s->data = read_sha1_file(s->sha1, &type, &s->size);
2831 if (!s->data)
2832 die("unable to read %s", sha1_to_hex(s->sha1));
2833 s->should_free = 1;
2834 }
2835 return 0;
2836 }
2837
2838 void diff_free_filespec_blob(struct diff_filespec *s)
2839 {
2840 if (s->should_free)
2841 free(s->data);
2842 else if (s->should_munmap)
2843 munmap(s->data, s->size);
2844
2845 if (s->should_free || s->should_munmap) {
2846 s->should_free = s->should_munmap = 0;
2847 s->data = NULL;
2848 }
2849 }
2850
2851 void diff_free_filespec_data(struct diff_filespec *s)
2852 {
2853 diff_free_filespec_blob(s);
2854 free(s->cnt_data);
2855 s->cnt_data = NULL;
2856 }
2857
2858 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2859 void *blob,
2860 unsigned long size,
2861 const unsigned char *sha1,
2862 int mode)
2863 {
2864 int fd;
2865 struct strbuf buf = STRBUF_INIT;
2866 struct strbuf template = STRBUF_INIT;
2867 char *path_dup = xstrdup(path);
2868 const char *base = basename(path_dup);
2869
2870 /* Generate "XXXXXX_basename.ext" */
2871 strbuf_addstr(&template, "XXXXXX_");
2872 strbuf_addstr(&template, base);
2873
2874 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2875 if (fd < 0)
2876 die_errno("unable to create temp-file");
2877 if (convert_to_working_tree(path,
2878 (const char *)blob, (size_t)size, &buf)) {
2879 blob = buf.buf;
2880 size = buf.len;
2881 }
2882 if (write_in_full(fd, blob, size) != size)
2883 die_errno("unable to write temp-file");
2884 close_tempfile(&temp->tempfile);
2885 temp->name = get_tempfile_path(&temp->tempfile);
2886 sha1_to_hex_r(temp->hex, sha1);
2887 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2888 strbuf_release(&buf);
2889 strbuf_release(&template);
2890 free(path_dup);
2891 }
2892
2893 static struct diff_tempfile *prepare_temp_file(const char *name,
2894 struct diff_filespec *one)
2895 {
2896 struct diff_tempfile *temp = claim_diff_tempfile();
2897
2898 if (!DIFF_FILE_VALID(one)) {
2899 not_a_valid_file:
2900 /* A '-' entry produces this for file-2, and
2901 * a '+' entry produces this for file-1.
2902 */
2903 temp->name = "/dev/null";
2904 xsnprintf(temp->hex, sizeof(temp->hex), ".");
2905 xsnprintf(temp->mode, sizeof(temp->mode), ".");
2906 return temp;
2907 }
2908
2909 if (!S_ISGITLINK(one->mode) &&
2910 (!one->sha1_valid ||
2911 reuse_worktree_file(name, one->sha1, 1))) {
2912 struct stat st;
2913 if (lstat(name, &st) < 0) {
2914 if (errno == ENOENT)
2915 goto not_a_valid_file;
2916 die_errno("stat(%s)", name);
2917 }
2918 if (S_ISLNK(st.st_mode)) {
2919 struct strbuf sb = STRBUF_INIT;
2920 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2921 die_errno("readlink(%s)", name);
2922 prep_temp_blob(name, temp, sb.buf, sb.len,
2923 (one->sha1_valid ?
2924 one->sha1 : null_sha1),
2925 (one->sha1_valid ?
2926 one->mode : S_IFLNK));
2927 strbuf_release(&sb);
2928 }
2929 else {
2930 /* we can borrow from the file in the work tree */
2931 temp->name = name;
2932 if (!one->sha1_valid)
2933 sha1_to_hex_r(temp->hex, null_sha1);
2934 else
2935 sha1_to_hex_r(temp->hex, one->sha1);
2936 /* Even though we may sometimes borrow the
2937 * contents from the work tree, we always want
2938 * one->mode. mode is trustworthy even when
2939 * !(one->sha1_valid), as long as
2940 * DIFF_FILE_VALID(one).
2941 */
2942 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
2943 }
2944 return temp;
2945 }
2946 else {
2947 if (diff_populate_filespec(one, 0))
2948 die("cannot read data blob for %s", one->path);
2949 prep_temp_blob(name, temp, one->data, one->size,
2950 one->sha1, one->mode);
2951 }
2952 return temp;
2953 }
2954
2955 static void add_external_diff_name(struct argv_array *argv,
2956 const char *name,
2957 struct diff_filespec *df)
2958 {
2959 struct diff_tempfile *temp = prepare_temp_file(name, df);
2960 argv_array_push(argv, temp->name);
2961 argv_array_push(argv, temp->hex);
2962 argv_array_push(argv, temp->mode);
2963 }
2964
2965 /* An external diff command takes:
2966 *
2967 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2968 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2969 *
2970 */
2971 static void run_external_diff(const char *pgm,
2972 const char *name,
2973 const char *other,
2974 struct diff_filespec *one,
2975 struct diff_filespec *two,
2976 const char *xfrm_msg,
2977 int complete_rewrite,
2978 struct diff_options *o)
2979 {
2980 struct argv_array argv = ARGV_ARRAY_INIT;
2981 struct argv_array env = ARGV_ARRAY_INIT;
2982 struct diff_queue_struct *q = &diff_queued_diff;
2983
2984 argv_array_push(&argv, pgm);
2985 argv_array_push(&argv, name);
2986
2987 if (one && two) {
2988 add_external_diff_name(&argv, name, one);
2989 if (!other)
2990 add_external_diff_name(&argv, name, two);
2991 else {
2992 add_external_diff_name(&argv, other, two);
2993 argv_array_push(&argv, other);
2994 argv_array_push(&argv, xfrm_msg);
2995 }
2996 }
2997
2998 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
2999 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3000
3001 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3002 die(_("external diff died, stopping at %s"), name);
3003
3004 remove_tempfile();
3005 argv_array_clear(&argv);
3006 argv_array_clear(&env);
3007 }
3008
3009 static int similarity_index(struct diff_filepair *p)
3010 {
3011 return p->score * 100 / MAX_SCORE;
3012 }
3013
3014 static void fill_metainfo(struct strbuf *msg,
3015 const char *name,
3016 const char *other,
3017 struct diff_filespec *one,
3018 struct diff_filespec *two,
3019 struct diff_options *o,
3020 struct diff_filepair *p,
3021 int *must_show_header,
3022 int use_color)
3023 {
3024 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3025 const char *reset = diff_get_color(use_color, DIFF_RESET);
3026 const char *line_prefix = diff_line_prefix(o);
3027
3028 *must_show_header = 1;
3029 strbuf_init(msg, PATH_MAX * 2 + 300);
3030 switch (p->status) {
3031 case DIFF_STATUS_COPIED:
3032 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3033 line_prefix, set, similarity_index(p));
3034 strbuf_addf(msg, "%s\n%s%scopy from ",
3035 reset, line_prefix, set);
3036 quote_c_style(name, msg, NULL, 0);
3037 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3038 quote_c_style(other, msg, NULL, 0);
3039 strbuf_addf(msg, "%s\n", reset);
3040 break;
3041 case DIFF_STATUS_RENAMED:
3042 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3043 line_prefix, set, similarity_index(p));
3044 strbuf_addf(msg, "%s\n%s%srename from ",
3045 reset, line_prefix, set);
3046 quote_c_style(name, msg, NULL, 0);
3047 strbuf_addf(msg, "%s\n%s%srename to ",
3048 reset, line_prefix, set);
3049 quote_c_style(other, msg, NULL, 0);
3050 strbuf_addf(msg, "%s\n", reset);
3051 break;
3052 case DIFF_STATUS_MODIFIED:
3053 if (p->score) {
3054 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3055 line_prefix,
3056 set, similarity_index(p), reset);
3057 break;
3058 }
3059 /* fallthru */
3060 default:
3061 *must_show_header = 0;
3062 }
3063 if (one && two && hashcmp(one->sha1, two->sha1)) {
3064 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3065
3066 if (DIFF_OPT_TST(o, BINARY)) {
3067 mmfile_t mf;
3068 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3069 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3070 abbrev = 40;
3071 }
3072 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3073 find_unique_abbrev(one->sha1, abbrev));
3074 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3075 if (one->mode == two->mode)
3076 strbuf_addf(msg, " %06o", one->mode);
3077 strbuf_addf(msg, "%s\n", reset);
3078 }
3079 }
3080
3081 static void run_diff_cmd(const char *pgm,
3082 const char *name,
3083 const char *other,
3084 const char *attr_path,
3085 struct diff_filespec *one,
3086 struct diff_filespec *two,
3087 struct strbuf *msg,
3088 struct diff_options *o,
3089 struct diff_filepair *p)
3090 {
3091 const char *xfrm_msg = NULL;
3092 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3093 int must_show_header = 0;
3094
3095
3096 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3097 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3098 if (drv && drv->external)
3099 pgm = drv->external;
3100 }
3101
3102 if (msg) {
3103 /*
3104 * don't use colors when the header is intended for an
3105 * external diff driver
3106 */
3107 fill_metainfo(msg, name, other, one, two, o, p,
3108 &must_show_header,
3109 want_color(o->use_color) && !pgm);
3110 xfrm_msg = msg->len ? msg->buf : NULL;
3111 }
3112
3113 if (pgm) {
3114 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3115 complete_rewrite, o);
3116 return;
3117 }
3118 if (one && two)
3119 builtin_diff(name, other ? other : name,
3120 one, two, xfrm_msg, must_show_header,
3121 o, complete_rewrite);
3122 else
3123 fprintf(o->file, "* Unmerged path %s\n", name);
3124 }
3125
3126 static void diff_fill_sha1_info(struct diff_filespec *one)
3127 {
3128 if (DIFF_FILE_VALID(one)) {
3129 if (!one->sha1_valid) {
3130 struct stat st;
3131 if (one->is_stdin) {
3132 hashcpy(one->sha1, null_sha1);
3133 return;
3134 }
3135 if (lstat(one->path, &st) < 0)
3136 die_errno("stat '%s'", one->path);
3137 if (index_path(one->sha1, one->path, &st, 0))
3138 die("cannot hash %s", one->path);
3139 }
3140 }
3141 else
3142 hashclr(one->sha1);
3143 }
3144
3145 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3146 {
3147 /* Strip the prefix but do not molest /dev/null and absolute paths */
3148 if (*namep && **namep != '/') {
3149 *namep += prefix_length;
3150 if (**namep == '/')
3151 ++*namep;
3152 }
3153 if (*otherp && **otherp != '/') {
3154 *otherp += prefix_length;
3155 if (**otherp == '/')
3156 ++*otherp;
3157 }
3158 }
3159
3160 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3161 {
3162 const char *pgm = external_diff();
3163 struct strbuf msg;
3164 struct diff_filespec *one = p->one;
3165 struct diff_filespec *two = p->two;
3166 const char *name;
3167 const char *other;
3168 const char *attr_path;
3169
3170 name = p->one->path;
3171 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3172 attr_path = name;
3173 if (o->prefix_length)
3174 strip_prefix(o->prefix_length, &name, &other);
3175
3176 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3177 pgm = NULL;
3178
3179 if (DIFF_PAIR_UNMERGED(p)) {
3180 run_diff_cmd(pgm, name, NULL, attr_path,
3181 NULL, NULL, NULL, o, p);
3182 return;
3183 }
3184
3185 diff_fill_sha1_info(one);
3186 diff_fill_sha1_info(two);
3187
3188 if (!pgm &&
3189 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3190 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3191 /*
3192 * a filepair that changes between file and symlink
3193 * needs to be split into deletion and creation.
3194 */
3195 struct diff_filespec *null = alloc_filespec(two->path);
3196 run_diff_cmd(NULL, name, other, attr_path,
3197 one, null, &msg, o, p);
3198 free(null);
3199 strbuf_release(&msg);
3200
3201 null = alloc_filespec(one->path);
3202 run_diff_cmd(NULL, name, other, attr_path,
3203 null, two, &msg, o, p);
3204 free(null);
3205 }
3206 else
3207 run_diff_cmd(pgm, name, other, attr_path,
3208 one, two, &msg, o, p);
3209
3210 strbuf_release(&msg);
3211 }
3212
3213 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3214 struct diffstat_t *diffstat)
3215 {
3216 const char *name;
3217 const char *other;
3218
3219 if (DIFF_PAIR_UNMERGED(p)) {
3220 /* unmerged */
3221 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3222 return;
3223 }
3224
3225 name = p->one->path;
3226 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3227
3228 if (o->prefix_length)
3229 strip_prefix(o->prefix_length, &name, &other);
3230
3231 diff_fill_sha1_info(p->one);
3232 diff_fill_sha1_info(p->two);
3233
3234 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3235 }
3236
3237 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3238 {
3239 const char *name;
3240 const char *other;
3241 const char *attr_path;
3242
3243 if (DIFF_PAIR_UNMERGED(p)) {
3244 /* unmerged */
3245 return;
3246 }
3247
3248 name = p->one->path;
3249 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3250 attr_path = other ? other : name;
3251
3252 if (o->prefix_length)
3253 strip_prefix(o->prefix_length, &name, &other);
3254
3255 diff_fill_sha1_info(p->one);
3256 diff_fill_sha1_info(p->two);
3257
3258 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3259 }
3260
3261 void diff_setup(struct diff_options *options)
3262 {
3263 memcpy(options, &default_diff_options, sizeof(*options));
3264
3265 options->file = stdout;
3266
3267 options->line_termination = '\n';
3268 options->break_opt = -1;
3269 options->rename_limit = -1;
3270 options->dirstat_permille = diff_dirstat_permille_default;
3271 options->context = diff_context_default;
3272 options->ws_error_highlight = WSEH_NEW;
3273 DIFF_OPT_SET(options, RENAME_EMPTY);
3274
3275 /* pathchange left =NULL by default */
3276 options->change = diff_change;
3277 options->add_remove = diff_addremove;
3278 options->use_color = diff_use_color_default;
3279 options->detect_rename = diff_detect_rename_default;
3280 options->xdl_opts |= diff_algorithm;
3281
3282 options->orderfile = diff_order_file_cfg;
3283
3284 if (diff_no_prefix) {
3285 options->a_prefix = options->b_prefix = "";
3286 } else if (!diff_mnemonic_prefix) {
3287 options->a_prefix = "a/";
3288 options->b_prefix = "b/";
3289 }
3290 }
3291
3292 void diff_setup_done(struct diff_options *options)
3293 {
3294 int count = 0;
3295
3296 if (options->set_default)
3297 options->set_default(options);
3298
3299 if (options->output_format & DIFF_FORMAT_NAME)
3300 count++;
3301 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3302 count++;
3303 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3304 count++;
3305 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3306 count++;
3307 if (count > 1)
3308 die("--name-only, --name-status, --check and -s are mutually exclusive");
3309
3310 /*
3311 * Most of the time we can say "there are changes"
3312 * only by checking if there are changed paths, but
3313 * --ignore-whitespace* options force us to look
3314 * inside contents.
3315 */
3316
3317 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3318 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3319 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3320 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3321 else
3322 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3323
3324 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3325 options->detect_rename = DIFF_DETECT_COPY;
3326
3327 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3328 options->prefix = NULL;
3329 if (options->prefix)
3330 options->prefix_length = strlen(options->prefix);
3331 else
3332 options->prefix_length = 0;
3333
3334 if (options->output_format & (DIFF_FORMAT_NAME |
3335 DIFF_FORMAT_NAME_STATUS |
3336 DIFF_FORMAT_CHECKDIFF |
3337 DIFF_FORMAT_NO_OUTPUT))
3338 options->output_format &= ~(DIFF_FORMAT_RAW |
3339 DIFF_FORMAT_NUMSTAT |
3340 DIFF_FORMAT_DIFFSTAT |
3341 DIFF_FORMAT_SHORTSTAT |
3342 DIFF_FORMAT_DIRSTAT |
3343 DIFF_FORMAT_SUMMARY |
3344 DIFF_FORMAT_PATCH);
3345
3346 /*
3347 * These cases always need recursive; we do not drop caller-supplied
3348 * recursive bits for other formats here.
3349 */
3350 if (options->output_format & (DIFF_FORMAT_PATCH |
3351 DIFF_FORMAT_NUMSTAT |
3352 DIFF_FORMAT_DIFFSTAT |
3353 DIFF_FORMAT_SHORTSTAT |
3354 DIFF_FORMAT_DIRSTAT |
3355 DIFF_FORMAT_SUMMARY |
3356 DIFF_FORMAT_CHECKDIFF))
3357 DIFF_OPT_SET(options, RECURSIVE);
3358 /*
3359 * Also pickaxe would not work very well if you do not say recursive
3360 */
3361 if (options->pickaxe)
3362 DIFF_OPT_SET(options, RECURSIVE);
3363 /*
3364 * When patches are generated, submodules diffed against the work tree
3365 * must be checked for dirtiness too so it can be shown in the output
3366 */
3367 if (options->output_format & DIFF_FORMAT_PATCH)
3368 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3369
3370 if (options->detect_rename && options->rename_limit < 0)
3371 options->rename_limit = diff_rename_limit_default;
3372 if (options->setup & DIFF_SETUP_USE_CACHE) {
3373 if (!active_cache)
3374 /* read-cache does not die even when it fails
3375 * so it is safe for us to do this here. Also
3376 * it does not smudge active_cache or active_nr
3377 * when it fails, so we do not have to worry about
3378 * cleaning it up ourselves either.
3379 */
3380 read_cache();
3381 }
3382 if (options->abbrev <= 0 || 40 < options->abbrev)
3383 options->abbrev = 40; /* full */
3384
3385 /*
3386 * It does not make sense to show the first hit we happened
3387 * to have found. It does not make sense not to return with
3388 * exit code in such a case either.
3389 */
3390 if (DIFF_OPT_TST(options, QUICK)) {
3391 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3392 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3393 }
3394
3395 options->diff_path_counter = 0;
3396
3397 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3398 die(_("--follow requires exactly one pathspec"));
3399 }
3400
3401 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3402 {
3403 char c, *eq;
3404 int len;
3405
3406 if (*arg != '-')
3407 return 0;
3408 c = *++arg;
3409 if (!c)
3410 return 0;
3411 if (c == arg_short) {
3412 c = *++arg;
3413 if (!c)
3414 return 1;
3415 if (val && isdigit(c)) {
3416 char *end;
3417 int n = strtoul(arg, &end, 10);
3418 if (*end)
3419 return 0;
3420 *val = n;
3421 return 1;
3422 }
3423 return 0;
3424 }
3425 if (c != '-')
3426 return 0;
3427 arg++;
3428 eq = strchrnul(arg, '=');
3429 len = eq - arg;
3430 if (!len || strncmp(arg, arg_long, len))
3431 return 0;
3432 if (*eq) {
3433 int n;
3434 char *end;
3435 if (!isdigit(*++eq))
3436 return 0;
3437 n = strtoul(eq, &end, 10);
3438 if (*end)
3439 return 0;
3440 *val = n;
3441 }
3442 return 1;
3443 }
3444
3445 static int diff_scoreopt_parse(const char *opt);
3446
3447 static inline int short_opt(char opt, const char **argv,
3448 const char **optarg)
3449 {
3450 const char *arg = argv[0];
3451 if (arg[0] != '-' || arg[1] != opt)
3452 return 0;
3453 if (arg[2] != '\0') {
3454 *optarg = arg + 2;
3455 return 1;
3456 }
3457 if (!argv[1])
3458 die("Option '%c' requires a value", opt);
3459 *optarg = argv[1];
3460 return 2;
3461 }
3462
3463 int parse_long_opt(const char *opt, const char **argv,
3464 const char **optarg)
3465 {
3466 const char *arg = argv[0];
3467 if (!skip_prefix(arg, "--", &arg))
3468 return 0;
3469 if (!skip_prefix(arg, opt, &arg))
3470 return 0;
3471 if (*arg == '=') { /* stuck form: --option=value */
3472 *optarg = arg + 1;
3473 return 1;
3474 }
3475 if (*arg != '\0')
3476 return 0;
3477 /* separate form: --option value */
3478 if (!argv[1])
3479 die("Option '--%s' requires a value", opt);
3480 *optarg = argv[1];
3481 return 2;
3482 }
3483
3484 static int stat_opt(struct diff_options *options, const char **av)
3485 {
3486 const char *arg = av[0];
3487 char *end;
3488 int width = options->stat_width;
3489 int name_width = options->stat_name_width;
3490 int graph_width = options->stat_graph_width;
3491 int count = options->stat_count;
3492 int argcount = 1;
3493
3494 if (!skip_prefix(arg, "--stat", &arg))
3495 die("BUG: stat option does not begin with --stat: %s", arg);
3496 end = (char *)arg;
3497
3498 switch (*arg) {
3499 case '-':
3500 if (skip_prefix(arg, "-width", &arg)) {
3501 if (*arg == '=')
3502 width = strtoul(arg + 1, &end, 10);
3503 else if (!*arg && !av[1])
3504 die("Option '--stat-width' requires a value");
3505 else if (!*arg) {
3506 width = strtoul(av[1], &end, 10);
3507 argcount = 2;
3508 }
3509 } else if (skip_prefix(arg, "-name-width", &arg)) {
3510 if (*arg == '=')
3511 name_width = strtoul(arg + 1, &end, 10);
3512 else if (!*arg && !av[1])
3513 die("Option '--stat-name-width' requires a value");
3514 else if (!*arg) {
3515 name_width = strtoul(av[1], &end, 10);
3516 argcount = 2;
3517 }
3518 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3519 if (*arg == '=')
3520 graph_width = strtoul(arg + 1, &end, 10);
3521 else if (!*arg && !av[1])
3522 die("Option '--stat-graph-width' requires a value");
3523 else if (!*arg) {
3524 graph_width = strtoul(av[1], &end, 10);
3525 argcount = 2;
3526 }
3527 } else if (skip_prefix(arg, "-count", &arg)) {
3528 if (*arg == '=')
3529 count = strtoul(arg + 1, &end, 10);
3530 else if (!*arg && !av[1])
3531 die("Option '--stat-count' requires a value");
3532 else if (!*arg) {
3533 count = strtoul(av[1], &end, 10);
3534 argcount = 2;
3535 }
3536 }
3537 break;
3538 case '=':
3539 width = strtoul(arg+1, &end, 10);
3540 if (*end == ',')
3541 name_width = strtoul(end+1, &end, 10);
3542 if (*end == ',')
3543 count = strtoul(end+1, &end, 10);
3544 }
3545
3546 /* Important! This checks all the error cases! */
3547 if (*end)
3548 return 0;
3549 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3550 options->stat_name_width = name_width;
3551 options->stat_graph_width = graph_width;
3552 options->stat_width = width;
3553 options->stat_count = count;
3554 return argcount;
3555 }
3556
3557 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3558 {
3559 struct strbuf errmsg = STRBUF_INIT;
3560 if (parse_dirstat_params(options, params, &errmsg))
3561 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3562 errmsg.buf);
3563 strbuf_release(&errmsg);
3564 /*
3565 * The caller knows a dirstat-related option is given from the command
3566 * line; allow it to say "return this_function();"
3567 */
3568 options->output_format |= DIFF_FORMAT_DIRSTAT;
3569 return 1;
3570 }
3571
3572 static int parse_submodule_opt(struct diff_options *options, const char *value)
3573 {
3574 if (parse_submodule_params(options, value))
3575 die(_("Failed to parse --submodule option parameter: '%s'"),
3576 value);
3577 return 1;
3578 }
3579
3580 static const char diff_status_letters[] = {
3581 DIFF_STATUS_ADDED,
3582 DIFF_STATUS_COPIED,
3583 DIFF_STATUS_DELETED,
3584 DIFF_STATUS_MODIFIED,
3585 DIFF_STATUS_RENAMED,
3586 DIFF_STATUS_TYPE_CHANGED,
3587 DIFF_STATUS_UNKNOWN,
3588 DIFF_STATUS_UNMERGED,
3589 DIFF_STATUS_FILTER_AON,
3590 DIFF_STATUS_FILTER_BROKEN,
3591 '\0',
3592 };
3593
3594 static unsigned int filter_bit['Z' + 1];
3595
3596 static void prepare_filter_bits(void)
3597 {
3598 int i;
3599
3600 if (!filter_bit[DIFF_STATUS_ADDED]) {
3601 for (i = 0; diff_status_letters[i]; i++)
3602 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3603 }
3604 }
3605
3606 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3607 {
3608 return opt->filter & filter_bit[(int) status];
3609 }
3610
3611 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3612 {
3613 int i, optch;
3614
3615 prepare_filter_bits();
3616
3617 /*
3618 * If there is a negation e.g. 'd' in the input, and we haven't
3619 * initialized the filter field with another --diff-filter, start
3620 * from full set of bits, except for AON.
3621 */
3622 if (!opt->filter) {
3623 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3624 if (optch < 'a' || 'z' < optch)
3625 continue;
3626 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3627 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3628 break;
3629 }
3630 }
3631
3632 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3633 unsigned int bit;
3634 int negate;
3635
3636 if ('a' <= optch && optch <= 'z') {
3637 negate = 1;
3638 optch = toupper(optch);
3639 } else {
3640 negate = 0;
3641 }
3642
3643 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3644 if (!bit)
3645 return optarg[i];
3646 if (negate)
3647 opt->filter &= ~bit;
3648 else
3649 opt->filter |= bit;
3650 }
3651 return 0;
3652 }
3653
3654 static void enable_patch_output(int *fmt) {
3655 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3656 *fmt |= DIFF_FORMAT_PATCH;
3657 }
3658
3659 static int parse_one_token(const char **arg, const char *token)
3660 {
3661 const char *rest;
3662 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3663 *arg = rest;
3664 return 1;
3665 }
3666 return 0;
3667 }
3668
3669 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3670 {
3671 const char *orig_arg = arg;
3672 unsigned val = 0;
3673 while (*arg) {
3674 if (parse_one_token(&arg, "none"))
3675 val = 0;
3676 else if (parse_one_token(&arg, "default"))
3677 val = WSEH_NEW;
3678 else if (parse_one_token(&arg, "all"))
3679 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3680 else if (parse_one_token(&arg, "new"))
3681 val |= WSEH_NEW;
3682 else if (parse_one_token(&arg, "old"))
3683 val |= WSEH_OLD;
3684 else if (parse_one_token(&arg, "context"))
3685 val |= WSEH_CONTEXT;
3686 else {
3687 error("unknown value after ws-error-highlight=%.*s",
3688 (int)(arg - orig_arg), orig_arg);
3689 return 0;
3690 }
3691 if (*arg)
3692 arg++;
3693 }
3694 opt->ws_error_highlight = val;
3695 return 1;
3696 }
3697
3698 int diff_opt_parse(struct diff_options *options,
3699 const char **av, int ac, const char *prefix)
3700 {
3701 const char *arg = av[0];
3702 const char *optarg;
3703 int argcount;
3704
3705 if (!prefix)
3706 prefix = "";
3707
3708 /* Output format options */
3709 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3710 || opt_arg(arg, 'U', "unified", &options->context))
3711 enable_patch_output(&options->output_format);
3712 else if (!strcmp(arg, "--raw"))
3713 options->output_format |= DIFF_FORMAT_RAW;
3714 else if (!strcmp(arg, "--patch-with-raw")) {
3715 enable_patch_output(&options->output_format);
3716 options->output_format |= DIFF_FORMAT_RAW;
3717 } else if (!strcmp(arg, "--numstat"))
3718 options->output_format |= DIFF_FORMAT_NUMSTAT;
3719 else if (!strcmp(arg, "--shortstat"))
3720 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3721 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3722 return parse_dirstat_opt(options, "");
3723 else if (skip_prefix(arg, "-X", &arg))
3724 return parse_dirstat_opt(options, arg);
3725 else if (skip_prefix(arg, "--dirstat=", &arg))
3726 return parse_dirstat_opt(options, arg);
3727 else if (!strcmp(arg, "--cumulative"))
3728 return parse_dirstat_opt(options, "cumulative");
3729 else if (!strcmp(arg, "--dirstat-by-file"))
3730 return parse_dirstat_opt(options, "files");
3731 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3732 parse_dirstat_opt(options, "files");
3733 return parse_dirstat_opt(options, arg);
3734 }
3735 else if (!strcmp(arg, "--check"))
3736 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3737 else if (!strcmp(arg, "--summary"))
3738 options->output_format |= DIFF_FORMAT_SUMMARY;
3739 else if (!strcmp(arg, "--patch-with-stat")) {
3740 enable_patch_output(&options->output_format);
3741 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3742 } else if (!strcmp(arg, "--name-only"))
3743 options->output_format |= DIFF_FORMAT_NAME;
3744 else if (!strcmp(arg, "--name-status"))
3745 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3746 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3747 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3748 else if (starts_with(arg, "--stat"))
3749 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3750 return stat_opt(options, av);
3751
3752 /* renames options */
3753 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3754 !strcmp(arg, "--break-rewrites")) {
3755 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3756 return error("invalid argument to -B: %s", arg+2);
3757 }
3758 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3759 !strcmp(arg, "--find-renames")) {
3760 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3761 return error("invalid argument to -M: %s", arg+2);
3762 options->detect_rename = DIFF_DETECT_RENAME;
3763 }
3764 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3765 options->irreversible_delete = 1;
3766 }
3767 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3768 !strcmp(arg, "--find-copies")) {
3769 if (options->detect_rename == DIFF_DETECT_COPY)
3770 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3771 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3772 return error("invalid argument to -C: %s", arg+2);
3773 options->detect_rename = DIFF_DETECT_COPY;
3774 }
3775 else if (!strcmp(arg, "--no-renames"))
3776 options->detect_rename = 0;
3777 else if (!strcmp(arg, "--rename-empty"))
3778 DIFF_OPT_SET(options, RENAME_EMPTY);
3779 else if (!strcmp(arg, "--no-rename-empty"))
3780 DIFF_OPT_CLR(options, RENAME_EMPTY);
3781 else if (!strcmp(arg, "--relative"))
3782 DIFF_OPT_SET(options, RELATIVE_NAME);
3783 else if (skip_prefix(arg, "--relative=", &arg)) {
3784 DIFF_OPT_SET(options, RELATIVE_NAME);
3785 options->prefix = arg;
3786 }
3787
3788 /* xdiff options */
3789 else if (!strcmp(arg, "--minimal"))
3790 DIFF_XDL_SET(options, NEED_MINIMAL);
3791 else if (!strcmp(arg, "--no-minimal"))
3792 DIFF_XDL_CLR(options, NEED_MINIMAL);
3793 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3794 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3795 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3796 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3797 else if (!strcmp(arg, "--ignore-space-at-eol"))
3798 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3799 else if (!strcmp(arg, "--ignore-blank-lines"))
3800 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3801 else if (!strcmp(arg, "--patience"))
3802 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3803 else if (!strcmp(arg, "--histogram"))
3804 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3805 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3806 long value = parse_algorithm_value(optarg);
3807 if (value < 0)
3808 return error("option diff-algorithm accepts \"myers\", "
3809 "\"minimal\", \"patience\" and \"histogram\"");
3810 /* clear out previous settings */
3811 DIFF_XDL_CLR(options, NEED_MINIMAL);
3812 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3813 options->xdl_opts |= value;
3814 return argcount;
3815 }
3816
3817 /* flags options */
3818 else if (!strcmp(arg, "--binary")) {
3819 enable_patch_output(&options->output_format);
3820 DIFF_OPT_SET(options, BINARY);
3821 }
3822 else if (!strcmp(arg, "--full-index"))
3823 DIFF_OPT_SET(options, FULL_INDEX);
3824 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3825 DIFF_OPT_SET(options, TEXT);
3826 else if (!strcmp(arg, "-R"))
3827 DIFF_OPT_SET(options, REVERSE_DIFF);
3828 else if (!strcmp(arg, "--find-copies-harder"))
3829 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3830 else if (!strcmp(arg, "--follow"))
3831 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3832 else if (!strcmp(arg, "--no-follow")) {
3833 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3834 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3835 } else if (!strcmp(arg, "--color"))
3836 options->use_color = 1;
3837 else if (skip_prefix(arg, "--color=", &arg)) {
3838 int value = git_config_colorbool(NULL, arg);
3839 if (value < 0)
3840 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3841 options->use_color = value;
3842 }
3843 else if (!strcmp(arg, "--no-color"))
3844 options->use_color = 0;
3845 else if (!strcmp(arg, "--color-words")) {
3846 options->use_color = 1;
3847 options->word_diff = DIFF_WORDS_COLOR;
3848 }
3849 else if (skip_prefix(arg, "--color-words=", &arg)) {
3850 options->use_color = 1;
3851 options->word_diff = DIFF_WORDS_COLOR;
3852 options->word_regex = arg;
3853 }
3854 else if (!strcmp(arg, "--word-diff")) {
3855 if (options->word_diff == DIFF_WORDS_NONE)
3856 options->word_diff = DIFF_WORDS_PLAIN;
3857 }
3858 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3859 if (!strcmp(arg, "plain"))
3860 options->word_diff = DIFF_WORDS_PLAIN;
3861 else if (!strcmp(arg, "color")) {
3862 options->use_color = 1;
3863 options->word_diff = DIFF_WORDS_COLOR;
3864 }
3865 else if (!strcmp(arg, "porcelain"))
3866 options->word_diff = DIFF_WORDS_PORCELAIN;
3867 else if (!strcmp(arg, "none"))
3868 options->word_diff = DIFF_WORDS_NONE;
3869 else
3870 die("bad --word-diff argument: %s", arg);
3871 }
3872 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3873 if (options->word_diff == DIFF_WORDS_NONE)
3874 options->word_diff = DIFF_WORDS_PLAIN;
3875 options->word_regex = optarg;
3876 return argcount;
3877 }
3878 else if (!strcmp(arg, "--exit-code"))
3879 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3880 else if (!strcmp(arg, "--quiet"))
3881 DIFF_OPT_SET(options, QUICK);
3882 else if (!strcmp(arg, "--ext-diff"))
3883 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3884 else if (!strcmp(arg, "--no-ext-diff"))
3885 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3886 else if (!strcmp(arg, "--textconv"))
3887 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3888 else if (!strcmp(arg, "--no-textconv"))
3889 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3890 else if (!strcmp(arg, "--ignore-submodules")) {
3891 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3892 handle_ignore_submodules_arg(options, "all");
3893 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3894 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3895 handle_ignore_submodules_arg(options, arg);
3896 } else if (!strcmp(arg, "--submodule"))
3897 DIFF_OPT_SET(options, SUBMODULE_LOG);
3898 else if (skip_prefix(arg, "--submodule=", &arg))
3899 return parse_submodule_opt(options, arg);
3900 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3901 return parse_ws_error_highlight(options, arg);
3902
3903 /* misc options */
3904 else if (!strcmp(arg, "-z"))
3905 options->line_termination = 0;
3906 else if ((argcount = short_opt('l', av, &optarg))) {
3907 options->rename_limit = strtoul(optarg, NULL, 10);
3908 return argcount;
3909 }
3910 else if ((argcount = short_opt('S', av, &optarg))) {
3911 options->pickaxe = optarg;
3912 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3913 return argcount;
3914 } else if ((argcount = short_opt('G', av, &optarg))) {
3915 options->pickaxe = optarg;
3916 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3917 return argcount;
3918 }
3919 else if (!strcmp(arg, "--pickaxe-all"))
3920 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3921 else if (!strcmp(arg, "--pickaxe-regex"))
3922 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3923 else if ((argcount = short_opt('O', av, &optarg))) {
3924 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3925 options->orderfile = xstrdup(path);
3926 return argcount;
3927 }
3928 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3929 int offending = parse_diff_filter_opt(optarg, options);
3930 if (offending)
3931 die("unknown change class '%c' in --diff-filter=%s",
3932 offending, optarg);
3933 return argcount;
3934 }
3935 else if (!strcmp(arg, "--abbrev"))
3936 options->abbrev = DEFAULT_ABBREV;
3937 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3938 options->abbrev = strtoul(arg, NULL, 10);
3939 if (options->abbrev < MINIMUM_ABBREV)
3940 options->abbrev = MINIMUM_ABBREV;
3941 else if (40 < options->abbrev)
3942 options->abbrev = 40;
3943 }
3944 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3945 options->a_prefix = optarg;
3946 return argcount;
3947 }
3948 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3949 options->b_prefix = optarg;
3950 return argcount;
3951 }
3952 else if (!strcmp(arg, "--no-prefix"))
3953 options->a_prefix = options->b_prefix = "";
3954 else if (opt_arg(arg, '\0', "inter-hunk-context",
3955 &options->interhunkcontext))
3956 ;
3957 else if (!strcmp(arg, "-W"))
3958 DIFF_OPT_SET(options, FUNCCONTEXT);
3959 else if (!strcmp(arg, "--function-context"))
3960 DIFF_OPT_SET(options, FUNCCONTEXT);
3961 else if (!strcmp(arg, "--no-function-context"))
3962 DIFF_OPT_CLR(options, FUNCCONTEXT);
3963 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3964 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3965 options->file = fopen(path, "w");
3966 if (!options->file)
3967 die_errno("Could not open '%s'", path);
3968 options->close_file = 1;
3969 return argcount;
3970 } else
3971 return 0;
3972 return 1;
3973 }
3974
3975 int parse_rename_score(const char **cp_p)
3976 {
3977 unsigned long num, scale;
3978 int ch, dot;
3979 const char *cp = *cp_p;
3980
3981 num = 0;
3982 scale = 1;
3983 dot = 0;
3984 for (;;) {
3985 ch = *cp;
3986 if ( !dot && ch == '.' ) {
3987 scale = 1;
3988 dot = 1;
3989 } else if ( ch == '%' ) {
3990 scale = dot ? scale*100 : 100;
3991 cp++; /* % is always at the end */
3992 break;
3993 } else if ( ch >= '0' && ch <= '9' ) {
3994 if ( scale < 100000 ) {
3995 scale *= 10;
3996 num = (num*10) + (ch-'0');
3997 }
3998 } else {
3999 break;
4000 }
4001 cp++;
4002 }
4003 *cp_p = cp;
4004
4005 /* user says num divided by scale and we say internally that
4006 * is MAX_SCORE * num / scale.
4007 */
4008 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4009 }
4010
4011 static int diff_scoreopt_parse(const char *opt)
4012 {
4013 int opt1, opt2, cmd;
4014
4015 if (*opt++ != '-')
4016 return -1;
4017 cmd = *opt++;
4018 if (cmd == '-') {
4019 /* convert the long-form arguments into short-form versions */
4020 if (skip_prefix(opt, "break-rewrites", &opt)) {
4021 if (*opt == 0 || *opt++ == '=')
4022 cmd = 'B';
4023 } else if (skip_prefix(opt, "find-copies", &opt)) {
4024 if (*opt == 0 || *opt++ == '=')
4025 cmd = 'C';
4026 } else if (skip_prefix(opt, "find-renames", &opt)) {
4027 if (*opt == 0 || *opt++ == '=')
4028 cmd = 'M';
4029 }
4030 }
4031 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4032 return -1; /* that is not a -M, -C, or -B option */
4033
4034 opt1 = parse_rename_score(&opt);
4035 if (cmd != 'B')
4036 opt2 = 0;
4037 else {
4038 if (*opt == 0)
4039 opt2 = 0;
4040 else if (*opt != '/')
4041 return -1; /* we expect -B80/99 or -B80 */
4042 else {
4043 opt++;
4044 opt2 = parse_rename_score(&opt);
4045 }
4046 }
4047 if (*opt != 0)
4048 return -1;
4049 return opt1 | (opt2 << 16);
4050 }
4051
4052 struct diff_queue_struct diff_queued_diff;
4053
4054 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4055 {
4056 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4057 queue->queue[queue->nr++] = dp;
4058 }
4059
4060 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4061 struct diff_filespec *one,
4062 struct diff_filespec *two)
4063 {
4064 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4065 dp->one = one;
4066 dp->two = two;
4067 if (queue)
4068 diff_q(queue, dp);
4069 return dp;
4070 }
4071
4072 void diff_free_filepair(struct diff_filepair *p)
4073 {
4074 free_filespec(p->one);
4075 free_filespec(p->two);
4076 free(p);
4077 }
4078
4079 /* This is different from find_unique_abbrev() in that
4080 * it stuffs the result with dots for alignment.
4081 */
4082 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4083 {
4084 int abblen;
4085 const char *abbrev;
4086 if (len == 40)
4087 return sha1_to_hex(sha1);
4088
4089 abbrev = find_unique_abbrev(sha1, len);
4090 abblen = strlen(abbrev);
4091 if (abblen < 37) {
4092 static char hex[41];
4093 if (len < abblen && abblen <= len + 2)
4094 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4095 else
4096 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4097 return hex;
4098 }
4099 return sha1_to_hex(sha1);
4100 }
4101
4102 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4103 {
4104 int line_termination = opt->line_termination;
4105 int inter_name_termination = line_termination ? '\t' : '\0';
4106
4107 fprintf(opt->file, "%s", diff_line_prefix(opt));
4108 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4109 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4110 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4111 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4112 }
4113 if (p->score) {
4114 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4115 inter_name_termination);
4116 } else {
4117 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4118 }
4119
4120 if (p->status == DIFF_STATUS_COPIED ||
4121 p->status == DIFF_STATUS_RENAMED) {
4122 const char *name_a, *name_b;
4123 name_a = p->one->path;
4124 name_b = p->two->path;
4125 strip_prefix(opt->prefix_length, &name_a, &name_b);
4126 write_name_quoted(name_a, opt->file, inter_name_termination);
4127 write_name_quoted(name_b, opt->file, line_termination);
4128 } else {
4129 const char *name_a, *name_b;
4130 name_a = p->one->mode ? p->one->path : p->two->path;
4131 name_b = NULL;
4132 strip_prefix(opt->prefix_length, &name_a, &name_b);
4133 write_name_quoted(name_a, opt->file, line_termination);
4134 }
4135 }
4136
4137 int diff_unmodified_pair(struct diff_filepair *p)
4138 {
4139 /* This function is written stricter than necessary to support
4140 * the currently implemented transformers, but the idea is to
4141 * let transformers to produce diff_filepairs any way they want,
4142 * and filter and clean them up here before producing the output.
4143 */
4144 struct diff_filespec *one = p->one, *two = p->two;
4145
4146 if (DIFF_PAIR_UNMERGED(p))
4147 return 0; /* unmerged is interesting */
4148
4149 /* deletion, addition, mode or type change
4150 * and rename are all interesting.
4151 */
4152 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4153 DIFF_PAIR_MODE_CHANGED(p) ||
4154 strcmp(one->path, two->path))
4155 return 0;
4156
4157 /* both are valid and point at the same path. that is, we are
4158 * dealing with a change.
4159 */
4160 if (one->sha1_valid && two->sha1_valid &&
4161 !hashcmp(one->sha1, two->sha1) &&
4162 !one->dirty_submodule && !two->dirty_submodule)
4163 return 1; /* no change */
4164 if (!one->sha1_valid && !two->sha1_valid)
4165 return 1; /* both look at the same file on the filesystem. */
4166 return 0;
4167 }
4168
4169 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4170 {
4171 if (diff_unmodified_pair(p))
4172 return;
4173
4174 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4175 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4176 return; /* no tree diffs in patch format */
4177
4178 run_diff(p, o);
4179 }
4180
4181 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4182 struct diffstat_t *diffstat)
4183 {
4184 if (diff_unmodified_pair(p))
4185 return;
4186
4187 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4188 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4189 return; /* no useful stat for tree diffs */
4190
4191 run_diffstat(p, o, diffstat);
4192 }
4193
4194 static void diff_flush_checkdiff(struct diff_filepair *p,
4195 struct diff_options *o)
4196 {
4197 if (diff_unmodified_pair(p))
4198 return;
4199
4200 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4201 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4202 return; /* nothing to check in tree diffs */
4203
4204 run_checkdiff(p, o);
4205 }
4206
4207 int diff_queue_is_empty(void)
4208 {
4209 struct diff_queue_struct *q = &diff_queued_diff;
4210 int i;
4211 for (i = 0; i < q->nr; i++)
4212 if (!diff_unmodified_pair(q->queue[i]))
4213 return 0;
4214 return 1;
4215 }
4216
4217 #if DIFF_DEBUG
4218 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4219 {
4220 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4221 x, one ? one : "",
4222 s->path,
4223 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4224 s->mode,
4225 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4226 fprintf(stderr, "queue[%d] %s size %lu\n",
4227 x, one ? one : "",
4228 s->size);
4229 }
4230
4231 void diff_debug_filepair(const struct diff_filepair *p, int i)
4232 {
4233 diff_debug_filespec(p->one, i, "one");
4234 diff_debug_filespec(p->two, i, "two");
4235 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4236 p->score, p->status ? p->status : '?',
4237 p->one->rename_used, p->broken_pair);
4238 }
4239
4240 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4241 {
4242 int i;
4243 if (msg)
4244 fprintf(stderr, "%s\n", msg);
4245 fprintf(stderr, "q->nr = %d\n", q->nr);
4246 for (i = 0; i < q->nr; i++) {
4247 struct diff_filepair *p = q->queue[i];
4248 diff_debug_filepair(p, i);
4249 }
4250 }
4251 #endif
4252
4253 static void diff_resolve_rename_copy(void)
4254 {
4255 int i;
4256 struct diff_filepair *p;
4257 struct diff_queue_struct *q = &diff_queued_diff;
4258
4259 diff_debug_queue("resolve-rename-copy", q);
4260
4261 for (i = 0; i < q->nr; i++) {
4262 p = q->queue[i];
4263 p->status = 0; /* undecided */
4264 if (DIFF_PAIR_UNMERGED(p))
4265 p->status = DIFF_STATUS_UNMERGED;
4266 else if (!DIFF_FILE_VALID(p->one))
4267 p->status = DIFF_STATUS_ADDED;
4268 else if (!DIFF_FILE_VALID(p->two))
4269 p->status = DIFF_STATUS_DELETED;
4270 else if (DIFF_PAIR_TYPE_CHANGED(p))
4271 p->status = DIFF_STATUS_TYPE_CHANGED;
4272
4273 /* from this point on, we are dealing with a pair
4274 * whose both sides are valid and of the same type, i.e.
4275 * either in-place edit or rename/copy edit.
4276 */
4277 else if (DIFF_PAIR_RENAME(p)) {
4278 /*
4279 * A rename might have re-connected a broken
4280 * pair up, causing the pathnames to be the
4281 * same again. If so, that's not a rename at
4282 * all, just a modification..
4283 *
4284 * Otherwise, see if this source was used for
4285 * multiple renames, in which case we decrement
4286 * the count, and call it a copy.
4287 */
4288 if (!strcmp(p->one->path, p->two->path))
4289 p->status = DIFF_STATUS_MODIFIED;
4290 else if (--p->one->rename_used > 0)
4291 p->status = DIFF_STATUS_COPIED;
4292 else
4293 p->status = DIFF_STATUS_RENAMED;
4294 }
4295 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4296 p->one->mode != p->two->mode ||
4297 p->one->dirty_submodule ||
4298 p->two->dirty_submodule ||
4299 is_null_sha1(p->one->sha1))
4300 p->status = DIFF_STATUS_MODIFIED;
4301 else {
4302 /* This is a "no-change" entry and should not
4303 * happen anymore, but prepare for broken callers.
4304 */
4305 error("feeding unmodified %s to diffcore",
4306 p->one->path);
4307 p->status = DIFF_STATUS_UNKNOWN;
4308 }
4309 }
4310 diff_debug_queue("resolve-rename-copy done", q);
4311 }
4312
4313 static int check_pair_status(struct diff_filepair *p)
4314 {
4315 switch (p->status) {
4316 case DIFF_STATUS_UNKNOWN:
4317 return 0;
4318 case 0:
4319 die("internal error in diff-resolve-rename-copy");
4320 default:
4321 return 1;
4322 }
4323 }
4324
4325 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4326 {
4327 int fmt = opt->output_format;
4328
4329 if (fmt & DIFF_FORMAT_CHECKDIFF)
4330 diff_flush_checkdiff(p, opt);
4331 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4332 diff_flush_raw(p, opt);
4333 else if (fmt & DIFF_FORMAT_NAME) {
4334 const char *name_a, *name_b;
4335 name_a = p->two->path;
4336 name_b = NULL;
4337 strip_prefix(opt->prefix_length, &name_a, &name_b);
4338 write_name_quoted(name_a, opt->file, opt->line_termination);
4339 }
4340 }
4341
4342 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4343 {
4344 if (fs->mode)
4345 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4346 else
4347 fprintf(file, " %s ", newdelete);
4348 write_name_quoted(fs->path, file, '\n');
4349 }
4350
4351
4352 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4353 const char *line_prefix)
4354 {
4355 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4356 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4357 p->two->mode, show_name ? ' ' : '\n');
4358 if (show_name) {
4359 write_name_quoted(p->two->path, file, '\n');
4360 }
4361 }
4362 }
4363
4364 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4365 const char *line_prefix)
4366 {
4367 char *names = pprint_rename(p->one->path, p->two->path);
4368
4369 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4370 free(names);
4371 show_mode_change(file, p, 0, line_prefix);
4372 }
4373
4374 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4375 {
4376 FILE *file = opt->file;
4377 const char *line_prefix = diff_line_prefix(opt);
4378
4379 switch(p->status) {
4380 case DIFF_STATUS_DELETED:
4381 fputs(line_prefix, file);
4382 show_file_mode_name(file, "delete", p->one);
4383 break;
4384 case DIFF_STATUS_ADDED:
4385 fputs(line_prefix, file);
4386 show_file_mode_name(file, "create", p->two);
4387 break;
4388 case DIFF_STATUS_COPIED:
4389 fputs(line_prefix, file);
4390 show_rename_copy(file, "copy", p, line_prefix);
4391 break;
4392 case DIFF_STATUS_RENAMED:
4393 fputs(line_prefix, file);
4394 show_rename_copy(file, "rename", p, line_prefix);
4395 break;
4396 default:
4397 if (p->score) {
4398 fprintf(file, "%s rewrite ", line_prefix);
4399 write_name_quoted(p->two->path, file, ' ');
4400 fprintf(file, "(%d%%)\n", similarity_index(p));
4401 }
4402 show_mode_change(file, p, !p->score, line_prefix);
4403 break;
4404 }
4405 }
4406
4407 struct patch_id_t {
4408 git_SHA_CTX *ctx;
4409 int patchlen;
4410 };
4411
4412 static int remove_space(char *line, int len)
4413 {
4414 int i;
4415 char *dst = line;
4416 unsigned char c;
4417
4418 for (i = 0; i < len; i++)
4419 if (!isspace((c = line[i])))
4420 *dst++ = c;
4421
4422 return dst - line;
4423 }
4424
4425 static void patch_id_consume(void *priv, char *line, unsigned long len)
4426 {
4427 struct patch_id_t *data = priv;
4428 int new_len;
4429
4430 /* Ignore line numbers when computing the SHA1 of the patch */
4431 if (starts_with(line, "@@ -"))
4432 return;
4433
4434 new_len = remove_space(line, len);
4435
4436 git_SHA1_Update(data->ctx, line, new_len);
4437 data->patchlen += new_len;
4438 }
4439
4440 /* returns 0 upon success, and writes result into sha1 */
4441 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4442 {
4443 struct diff_queue_struct *q = &diff_queued_diff;
4444 int i;
4445 git_SHA_CTX ctx;
4446 struct patch_id_t data;
4447 char buffer[PATH_MAX * 4 + 20];
4448
4449 git_SHA1_Init(&ctx);
4450 memset(&data, 0, sizeof(struct patch_id_t));
4451 data.ctx = &ctx;
4452
4453 for (i = 0; i < q->nr; i++) {
4454 xpparam_t xpp;
4455 xdemitconf_t xecfg;
4456 mmfile_t mf1, mf2;
4457 struct diff_filepair *p = q->queue[i];
4458 int len1, len2;
4459
4460 memset(&xpp, 0, sizeof(xpp));
4461 memset(&xecfg, 0, sizeof(xecfg));
4462 if (p->status == 0)
4463 return error("internal diff status error");
4464 if (p->status == DIFF_STATUS_UNKNOWN)
4465 continue;
4466 if (diff_unmodified_pair(p))
4467 continue;
4468 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4469 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4470 continue;
4471 if (DIFF_PAIR_UNMERGED(p))
4472 continue;
4473
4474 diff_fill_sha1_info(p->one);
4475 diff_fill_sha1_info(p->two);
4476 if (fill_mmfile(&mf1, p->one) < 0 ||
4477 fill_mmfile(&mf2, p->two) < 0)
4478 return error("unable to read files to diff");
4479
4480 len1 = remove_space(p->one->path, strlen(p->one->path));
4481 len2 = remove_space(p->two->path, strlen(p->two->path));
4482 if (p->one->mode == 0)
4483 len1 = snprintf(buffer, sizeof(buffer),
4484 "diff--gita/%.*sb/%.*s"
4485 "newfilemode%06o"
4486 "---/dev/null"
4487 "+++b/%.*s",
4488 len1, p->one->path,
4489 len2, p->two->path,
4490 p->two->mode,
4491 len2, p->two->path);
4492 else if (p->two->mode == 0)
4493 len1 = snprintf(buffer, sizeof(buffer),
4494 "diff--gita/%.*sb/%.*s"
4495 "deletedfilemode%06o"
4496 "---a/%.*s"
4497 "+++/dev/null",
4498 len1, p->one->path,
4499 len2, p->two->path,
4500 p->one->mode,
4501 len1, p->one->path);
4502 else
4503 len1 = snprintf(buffer, sizeof(buffer),
4504 "diff--gita/%.*sb/%.*s"
4505 "---a/%.*s"
4506 "+++b/%.*s",
4507 len1, p->one->path,
4508 len2, p->two->path,
4509 len1, p->one->path,
4510 len2, p->two->path);
4511 git_SHA1_Update(&ctx, buffer, len1);
4512
4513 if (diff_filespec_is_binary(p->one) ||
4514 diff_filespec_is_binary(p->two)) {
4515 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4516 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4517 continue;
4518 }
4519
4520 xpp.flags = 0;
4521 xecfg.ctxlen = 3;
4522 xecfg.flags = 0;
4523 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4524 &xpp, &xecfg))
4525 return error("unable to generate patch-id diff for %s",
4526 p->one->path);
4527 }
4528
4529 git_SHA1_Final(sha1, &ctx);
4530 return 0;
4531 }
4532
4533 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4534 {
4535 struct diff_queue_struct *q = &diff_queued_diff;
4536 int i;
4537 int result = diff_get_patch_id(options, sha1);
4538
4539 for (i = 0; i < q->nr; i++)
4540 diff_free_filepair(q->queue[i]);
4541
4542 free(q->queue);
4543 DIFF_QUEUE_CLEAR(q);
4544
4545 return result;
4546 }
4547
4548 static int is_summary_empty(const struct diff_queue_struct *q)
4549 {
4550 int i;
4551
4552 for (i = 0; i < q->nr; i++) {
4553 const struct diff_filepair *p = q->queue[i];
4554
4555 switch (p->status) {
4556 case DIFF_STATUS_DELETED:
4557 case DIFF_STATUS_ADDED:
4558 case DIFF_STATUS_COPIED:
4559 case DIFF_STATUS_RENAMED:
4560 return 0;
4561 default:
4562 if (p->score)
4563 return 0;
4564 if (p->one->mode && p->two->mode &&
4565 p->one->mode != p->two->mode)
4566 return 0;
4567 break;
4568 }
4569 }
4570 return 1;
4571 }
4572
4573 static const char rename_limit_warning[] =
4574 "inexact rename detection was skipped due to too many files.";
4575
4576 static const char degrade_cc_to_c_warning[] =
4577 "only found copies from modified paths due to too many files.";
4578
4579 static const char rename_limit_advice[] =
4580 "you may want to set your %s variable to at least "
4581 "%d and retry the command.";
4582
4583 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4584 {
4585 if (degraded_cc)
4586 warning(degrade_cc_to_c_warning);
4587 else if (needed)
4588 warning(rename_limit_warning);
4589 else
4590 return;
4591 if (0 < needed && needed < 32767)
4592 warning(rename_limit_advice, varname, needed);
4593 }
4594
4595 void diff_flush(struct diff_options *options)
4596 {
4597 struct diff_queue_struct *q = &diff_queued_diff;
4598 int i, output_format = options->output_format;
4599 int separator = 0;
4600 int dirstat_by_line = 0;
4601
4602 /*
4603 * Order: raw, stat, summary, patch
4604 * or: name/name-status/checkdiff (other bits clear)
4605 */
4606 if (!q->nr)
4607 goto free_queue;
4608
4609 if (output_format & (DIFF_FORMAT_RAW |
4610 DIFF_FORMAT_NAME |
4611 DIFF_FORMAT_NAME_STATUS |
4612 DIFF_FORMAT_CHECKDIFF)) {
4613 for (i = 0; i < q->nr; i++) {
4614 struct diff_filepair *p = q->queue[i];
4615 if (check_pair_status(p))
4616 flush_one_pair(p, options);
4617 }
4618 separator++;
4619 }
4620
4621 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4622 dirstat_by_line = 1;
4623
4624 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4625 dirstat_by_line) {
4626 struct diffstat_t diffstat;
4627
4628 memset(&diffstat, 0, sizeof(struct diffstat_t));
4629 for (i = 0; i < q->nr; i++) {
4630 struct diff_filepair *p = q->queue[i];
4631 if (check_pair_status(p))
4632 diff_flush_stat(p, options, &diffstat);
4633 }
4634 if (output_format & DIFF_FORMAT_NUMSTAT)
4635 show_numstat(&diffstat, options);
4636 if (output_format & DIFF_FORMAT_DIFFSTAT)
4637 show_stats(&diffstat, options);
4638 if (output_format & DIFF_FORMAT_SHORTSTAT)
4639 show_shortstats(&diffstat, options);
4640 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4641 show_dirstat_by_line(&diffstat, options);
4642 free_diffstat_info(&diffstat);
4643 separator++;
4644 }
4645 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4646 show_dirstat(options);
4647
4648 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4649 for (i = 0; i < q->nr; i++) {
4650 diff_summary(options, q->queue[i]);
4651 }
4652 separator++;
4653 }
4654
4655 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4656 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4657 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4658 /*
4659 * run diff_flush_patch for the exit status. setting
4660 * options->file to /dev/null should be safe, because we
4661 * aren't supposed to produce any output anyway.
4662 */
4663 if (options->close_file)
4664 fclose(options->file);
4665 options->file = fopen("/dev/null", "w");
4666 if (!options->file)
4667 die_errno("Could not open /dev/null");
4668 options->close_file = 1;
4669 for (i = 0; i < q->nr; i++) {
4670 struct diff_filepair *p = q->queue[i];
4671 if (check_pair_status(p))
4672 diff_flush_patch(p, options);
4673 if (options->found_changes)
4674 break;
4675 }
4676 }
4677
4678 if (output_format & DIFF_FORMAT_PATCH) {
4679 if (separator) {
4680 fprintf(options->file, "%s%c",
4681 diff_line_prefix(options),
4682 options->line_termination);
4683 if (options->stat_sep) {
4684 /* attach patch instead of inline */
4685 fputs(options->stat_sep, options->file);
4686 }
4687 }
4688
4689 for (i = 0; i < q->nr; i++) {
4690 struct diff_filepair *p = q->queue[i];
4691 if (check_pair_status(p))
4692 diff_flush_patch(p, options);
4693 }
4694 }
4695
4696 if (output_format & DIFF_FORMAT_CALLBACK)
4697 options->format_callback(q, options, options->format_callback_data);
4698
4699 for (i = 0; i < q->nr; i++)
4700 diff_free_filepair(q->queue[i]);
4701 free_queue:
4702 free(q->queue);
4703 DIFF_QUEUE_CLEAR(q);
4704 if (options->close_file)
4705 fclose(options->file);
4706
4707 /*
4708 * Report the content-level differences with HAS_CHANGES;
4709 * diff_addremove/diff_change does not set the bit when
4710 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4711 */
4712 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4713 if (options->found_changes)
4714 DIFF_OPT_SET(options, HAS_CHANGES);
4715 else
4716 DIFF_OPT_CLR(options, HAS_CHANGES);
4717 }
4718 }
4719
4720 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4721 {
4722 return (((p->status == DIFF_STATUS_MODIFIED) &&
4723 ((p->score &&
4724 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4725 (!p->score &&
4726 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4727 ((p->status != DIFF_STATUS_MODIFIED) &&
4728 filter_bit_tst(p->status, options)));
4729 }
4730
4731 static void diffcore_apply_filter(struct diff_options *options)
4732 {
4733 int i;
4734 struct diff_queue_struct *q = &diff_queued_diff;
4735 struct diff_queue_struct outq;
4736
4737 DIFF_QUEUE_CLEAR(&outq);
4738
4739 if (!options->filter)
4740 return;
4741
4742 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4743 int found;
4744 for (i = found = 0; !found && i < q->nr; i++) {
4745 if (match_filter(options, q->queue[i]))
4746 found++;
4747 }
4748 if (found)
4749 return;
4750
4751 /* otherwise we will clear the whole queue
4752 * by copying the empty outq at the end of this
4753 * function, but first clear the current entries
4754 * in the queue.
4755 */
4756 for (i = 0; i < q->nr; i++)
4757 diff_free_filepair(q->queue[i]);
4758 }
4759 else {
4760 /* Only the matching ones */
4761 for (i = 0; i < q->nr; i++) {
4762 struct diff_filepair *p = q->queue[i];
4763 if (match_filter(options, p))
4764 diff_q(&outq, p);
4765 else
4766 diff_free_filepair(p);
4767 }
4768 }
4769 free(q->queue);
4770 *q = outq;
4771 }
4772
4773 /* Check whether two filespecs with the same mode and size are identical */
4774 static int diff_filespec_is_identical(struct diff_filespec *one,
4775 struct diff_filespec *two)
4776 {
4777 if (S_ISGITLINK(one->mode))
4778 return 0;
4779 if (diff_populate_filespec(one, 0))
4780 return 0;
4781 if (diff_populate_filespec(two, 0))
4782 return 0;
4783 return !memcmp(one->data, two->data, one->size);
4784 }
4785
4786 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4787 {
4788 if (p->done_skip_stat_unmatch)
4789 return p->skip_stat_unmatch_result;
4790
4791 p->done_skip_stat_unmatch = 1;
4792 p->skip_stat_unmatch_result = 0;
4793 /*
4794 * 1. Entries that come from stat info dirtiness
4795 * always have both sides (iow, not create/delete),
4796 * one side of the object name is unknown, with
4797 * the same mode and size. Keep the ones that
4798 * do not match these criteria. They have real
4799 * differences.
4800 *
4801 * 2. At this point, the file is known to be modified,
4802 * with the same mode and size, and the object
4803 * name of one side is unknown. Need to inspect
4804 * the identical contents.
4805 */
4806 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4807 !DIFF_FILE_VALID(p->two) ||
4808 (p->one->sha1_valid && p->two->sha1_valid) ||
4809 (p->one->mode != p->two->mode) ||
4810 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4811 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4812 (p->one->size != p->two->size) ||
4813 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4814 p->skip_stat_unmatch_result = 1;
4815 return p->skip_stat_unmatch_result;
4816 }
4817
4818 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4819 {
4820 int i;
4821 struct diff_queue_struct *q = &diff_queued_diff;
4822 struct diff_queue_struct outq;
4823 DIFF_QUEUE_CLEAR(&outq);
4824
4825 for (i = 0; i < q->nr; i++) {
4826 struct diff_filepair *p = q->queue[i];
4827
4828 if (diff_filespec_check_stat_unmatch(p))
4829 diff_q(&outq, p);
4830 else {
4831 /*
4832 * The caller can subtract 1 from skip_stat_unmatch
4833 * to determine how many paths were dirty only
4834 * due to stat info mismatch.
4835 */
4836 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4837 diffopt->skip_stat_unmatch++;
4838 diff_free_filepair(p);
4839 }
4840 }
4841 free(q->queue);
4842 *q = outq;
4843 }
4844
4845 static int diffnamecmp(const void *a_, const void *b_)
4846 {
4847 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4848 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4849 const char *name_a, *name_b;
4850
4851 name_a = a->one ? a->one->path : a->two->path;
4852 name_b = b->one ? b->one->path : b->two->path;
4853 return strcmp(name_a, name_b);
4854 }
4855
4856 void diffcore_fix_diff_index(struct diff_options *options)
4857 {
4858 struct diff_queue_struct *q = &diff_queued_diff;
4859 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4860 }
4861
4862 void diffcore_std(struct diff_options *options)
4863 {
4864 /* NOTE please keep the following in sync with diff_tree_combined() */
4865 if (options->skip_stat_unmatch)
4866 diffcore_skip_stat_unmatch(options);
4867 if (!options->found_follow) {
4868 /* See try_to_follow_renames() in tree-diff.c */
4869 if (options->break_opt != -1)
4870 diffcore_break(options->break_opt);
4871 if (options->detect_rename)
4872 diffcore_rename(options);
4873 if (options->break_opt != -1)
4874 diffcore_merge_broken();
4875 }
4876 if (options->pickaxe)
4877 diffcore_pickaxe(options);
4878 if (options->orderfile)
4879 diffcore_order(options->orderfile);
4880 if (!options->found_follow)
4881 /* See try_to_follow_renames() in tree-diff.c */
4882 diff_resolve_rename_copy();
4883 diffcore_apply_filter(options);
4884
4885 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4886 DIFF_OPT_SET(options, HAS_CHANGES);
4887 else
4888 DIFF_OPT_CLR(options, HAS_CHANGES);
4889
4890 options->found_follow = 0;
4891 }
4892
4893 int diff_result_code(struct diff_options *opt, int status)
4894 {
4895 int result = 0;
4896
4897 diff_warn_rename_limit("diff.renameLimit",
4898 opt->needed_rename_limit,
4899 opt->degraded_cc_to_c);
4900 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4901 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4902 return status;
4903 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4904 DIFF_OPT_TST(opt, HAS_CHANGES))
4905 result |= 01;
4906 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4907 DIFF_OPT_TST(opt, CHECK_FAILED))
4908 result |= 02;
4909 return result;
4910 }
4911
4912 int diff_can_quit_early(struct diff_options *opt)
4913 {
4914 return (DIFF_OPT_TST(opt, QUICK) &&
4915 !opt->filter &&
4916 DIFF_OPT_TST(opt, HAS_CHANGES));
4917 }
4918
4919 /*
4920 * Shall changes to this submodule be ignored?
4921 *
4922 * Submodule changes can be configured to be ignored separately for each path,
4923 * but that configuration can be overridden from the command line.
4924 */
4925 static int is_submodule_ignored(const char *path, struct diff_options *options)
4926 {
4927 int ignored = 0;
4928 unsigned orig_flags = options->flags;
4929 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4930 set_diffopt_flags_from_submodule_config(options, path);
4931 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4932 ignored = 1;
4933 options->flags = orig_flags;
4934 return ignored;
4935 }
4936
4937 void diff_addremove(struct diff_options *options,
4938 int addremove, unsigned mode,
4939 const unsigned char *sha1,
4940 int sha1_valid,
4941 const char *concatpath, unsigned dirty_submodule)
4942 {
4943 struct diff_filespec *one, *two;
4944
4945 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4946 return;
4947
4948 /* This may look odd, but it is a preparation for
4949 * feeding "there are unchanged files which should
4950 * not produce diffs, but when you are doing copy
4951 * detection you would need them, so here they are"
4952 * entries to the diff-core. They will be prefixed
4953 * with something like '=' or '*' (I haven't decided
4954 * which but should not make any difference).
4955 * Feeding the same new and old to diff_change()
4956 * also has the same effect.
4957 * Before the final output happens, they are pruned after
4958 * merged into rename/copy pairs as appropriate.
4959 */
4960 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4961 addremove = (addremove == '+' ? '-' :
4962 addremove == '-' ? '+' : addremove);
4963
4964 if (options->prefix &&
4965 strncmp(concatpath, options->prefix, options->prefix_length))
4966 return;
4967
4968 one = alloc_filespec(concatpath);
4969 two = alloc_filespec(concatpath);
4970
4971 if (addremove != '+')
4972 fill_filespec(one, sha1, sha1_valid, mode);
4973 if (addremove != '-') {
4974 fill_filespec(two, sha1, sha1_valid, mode);
4975 two->dirty_submodule = dirty_submodule;
4976 }
4977
4978 diff_queue(&diff_queued_diff, one, two);
4979 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4980 DIFF_OPT_SET(options, HAS_CHANGES);
4981 }
4982
4983 void diff_change(struct diff_options *options,
4984 unsigned old_mode, unsigned new_mode,
4985 const unsigned char *old_sha1,
4986 const unsigned char *new_sha1,
4987 int old_sha1_valid, int new_sha1_valid,
4988 const char *concatpath,
4989 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4990 {
4991 struct diff_filespec *one, *two;
4992 struct diff_filepair *p;
4993
4994 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4995 is_submodule_ignored(concatpath, options))
4996 return;
4997
4998 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4999 unsigned tmp;
5000 const unsigned char *tmp_c;
5001 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
5002 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
5003 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
5004 new_sha1_valid = tmp;
5005 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
5006 new_dirty_submodule = tmp;
5007 }
5008
5009 if (options->prefix &&
5010 strncmp(concatpath, options->prefix, options->prefix_length))
5011 return;
5012
5013 one = alloc_filespec(concatpath);
5014 two = alloc_filespec(concatpath);
5015 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5016 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5017 one->dirty_submodule = old_dirty_submodule;
5018 two->dirty_submodule = new_dirty_submodule;
5019 p = diff_queue(&diff_queued_diff, one, two);
5020
5021 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5022 return;
5023
5024 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5025 !diff_filespec_check_stat_unmatch(p))
5026 return;
5027
5028 DIFF_OPT_SET(options, HAS_CHANGES);
5029 }
5030
5031 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5032 {
5033 struct diff_filepair *pair;
5034 struct diff_filespec *one, *two;
5035
5036 if (options->prefix &&
5037 strncmp(path, options->prefix, options->prefix_length))
5038 return NULL;
5039
5040 one = alloc_filespec(path);
5041 two = alloc_filespec(path);
5042 pair = diff_queue(&diff_queued_diff, one, two);
5043 pair->is_unmerged = 1;
5044 return pair;
5045 }
5046
5047 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5048 size_t *outsize)
5049 {
5050 struct diff_tempfile *temp;
5051 const char *argv[3];
5052 const char **arg = argv;
5053 struct child_process child = CHILD_PROCESS_INIT;
5054 struct strbuf buf = STRBUF_INIT;
5055 int err = 0;
5056
5057 temp = prepare_temp_file(spec->path, spec);
5058 *arg++ = pgm;
5059 *arg++ = temp->name;
5060 *arg = NULL;
5061
5062 child.use_shell = 1;
5063 child.argv = argv;
5064 child.out = -1;
5065 if (start_command(&child)) {
5066 remove_tempfile();
5067 return NULL;
5068 }
5069
5070 if (strbuf_read(&buf, child.out, 0) < 0)
5071 err = error("error reading from textconv command '%s'", pgm);
5072 close(child.out);
5073
5074 if (finish_command(&child) || err) {
5075 strbuf_release(&buf);
5076 remove_tempfile();
5077 return NULL;
5078 }
5079 remove_tempfile();
5080
5081 return strbuf_detach(&buf, outsize);
5082 }
5083
5084 size_t fill_textconv(struct userdiff_driver *driver,
5085 struct diff_filespec *df,
5086 char **outbuf)
5087 {
5088 size_t size;
5089
5090 if (!driver) {
5091 if (!DIFF_FILE_VALID(df)) {
5092 *outbuf = "";
5093 return 0;
5094 }
5095 if (diff_populate_filespec(df, 0))
5096 die("unable to read files to diff");
5097 *outbuf = df->data;
5098 return df->size;
5099 }
5100
5101 if (!driver->textconv)
5102 die("BUG: fill_textconv called with non-textconv driver");
5103
5104 if (driver->textconv_cache && df->sha1_valid) {
5105 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5106 &size);
5107 if (*outbuf)
5108 return size;
5109 }
5110
5111 *outbuf = run_textconv(driver->textconv, df, &size);
5112 if (!*outbuf)
5113 die("unable to read files to diff");
5114
5115 if (driver->textconv_cache && df->sha1_valid) {
5116 /* ignore errors, as we might be in a readonly repository */
5117 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5118 size);
5119 /*
5120 * we could save up changes and flush them all at the end,
5121 * but we would need an extra call after all diffing is done.
5122 * Since generating a cache entry is the slow path anyway,
5123 * this extra overhead probably isn't a big deal.
5124 */
5125 notes_cache_write(driver->textconv_cache);
5126 }
5127
5128 return size;
5129 }
5130
5131 void setup_diff_pager(struct diff_options *opt)
5132 {
5133 /*
5134 * If the user asked for our exit code, then either they want --quiet
5135 * or --exit-code. We should definitely not bother with a pager in the
5136 * former case, as we will generate no output. Since we still properly
5137 * report our exit code even when a pager is run, we _could_ run a
5138 * pager with --exit-code. But since we have not done so historically,
5139 * and because it is easy to find people oneline advising "git diff
5140 * --exit-code" in hooks and other scripts, we do not do so.
5141 */
5142 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5143 check_pager_config("diff") != 0)
5144 setup_pager();
5145 }
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