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Merge branch 'tg/add-chmod+x-fix' into maint
[alt-git.git] / diff.c
blob7a4309397cb7fd6819d6f643b259c2bc3abe202f
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_compaction_heuristic; /* experimental */
30 static int diff_rename_limit_default = 400;
31 static int diff_suppress_blank_empty;
32 static int diff_use_color_default = -1;
33 static int diff_context_default = 3;
34 static const char *diff_word_regex_cfg;
35 static const char *external_diff_cmd_cfg;
36 static const char *diff_order_file_cfg;
37 int diff_auto_refresh_index = 1;
38 static int diff_mnemonic_prefix;
39 static int diff_no_prefix;
40 static int diff_stat_graph_width;
41 static int diff_dirstat_permille_default = 30;
42 static struct diff_options default_diff_options;
43 static long diff_algorithm;
44
45 static char diff_colors[][COLOR_MAXLEN] = {
46 GIT_COLOR_RESET,
47 GIT_COLOR_NORMAL, /* CONTEXT */
48 GIT_COLOR_BOLD, /* METAINFO */
49 GIT_COLOR_CYAN, /* FRAGINFO */
50 GIT_COLOR_RED, /* OLD */
51 GIT_COLOR_GREEN, /* NEW */
52 GIT_COLOR_YELLOW, /* COMMIT */
53 GIT_COLOR_BG_RED, /* WHITESPACE */
54 GIT_COLOR_NORMAL, /* FUNCINFO */
55 };
56
57 static int parse_diff_color_slot(const char *var)
58 {
59 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
60 return DIFF_CONTEXT;
61 if (!strcasecmp(var, "meta"))
62 return DIFF_METAINFO;
63 if (!strcasecmp(var, "frag"))
64 return DIFF_FRAGINFO;
65 if (!strcasecmp(var, "old"))
66 return DIFF_FILE_OLD;
67 if (!strcasecmp(var, "new"))
68 return DIFF_FILE_NEW;
69 if (!strcasecmp(var, "commit"))
70 return DIFF_COMMIT;
71 if (!strcasecmp(var, "whitespace"))
72 return DIFF_WHITESPACE;
73 if (!strcasecmp(var, "func"))
74 return DIFF_FUNCINFO;
75 return -1;
76 }
77
78 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
79 struct strbuf *errmsg)
80 {
81 char *params_copy = xstrdup(params_string);
82 struct string_list params = STRING_LIST_INIT_NODUP;
83 int ret = 0;
84 int i;
85
86 if (*params_copy)
87 string_list_split_in_place(&params, params_copy, ',', -1);
88 for (i = 0; i < params.nr; i++) {
89 const char *p = params.items[i].string;
90 if (!strcmp(p, "changes")) {
91 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
92 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
93 } else if (!strcmp(p, "lines")) {
94 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
95 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
96 } else if (!strcmp(p, "files")) {
97 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
98 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
99 } else if (!strcmp(p, "noncumulative")) {
100 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
101 } else if (!strcmp(p, "cumulative")) {
102 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
103 } else if (isdigit(*p)) {
104 char *end;
105 int permille = strtoul(p, &end, 10) * 10;
106 if (*end == '.' && isdigit(*++end)) {
107 /* only use first digit */
108 permille += *end - '0';
109 /* .. and ignore any further digits */
110 while (isdigit(*++end))
111 ; /* nothing */
112 }
113 if (!*end)
114 options->dirstat_permille = permille;
115 else {
116 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
117 p);
118 ret++;
119 }
120 } else {
121 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
122 ret++;
123 }
124
125 }
126 string_list_clear(&params, 0);
127 free(params_copy);
128 return ret;
129 }
130
131 static int parse_submodule_params(struct diff_options *options, const char *value)
132 {
133 if (!strcmp(value, "log"))
134 DIFF_OPT_SET(options, SUBMODULE_LOG);
135 else if (!strcmp(value, "short"))
136 DIFF_OPT_CLR(options, SUBMODULE_LOG);
137 else
138 return -1;
139 return 0;
140 }
141
142 static int git_config_rename(const char *var, const char *value)
143 {
144 if (!value)
145 return DIFF_DETECT_RENAME;
146 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
147 return DIFF_DETECT_COPY;
148 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
149 }
150
151 long parse_algorithm_value(const char *value)
152 {
153 if (!value)
154 return -1;
155 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
156 return 0;
157 else if (!strcasecmp(value, "minimal"))
158 return XDF_NEED_MINIMAL;
159 else if (!strcasecmp(value, "patience"))
160 return XDF_PATIENCE_DIFF;
161 else if (!strcasecmp(value, "histogram"))
162 return XDF_HISTOGRAM_DIFF;
163 return -1;
164 }
165
166 /*
167 * These are to give UI layer defaults.
168 * The core-level commands such as git-diff-files should
169 * never be affected by the setting of diff.renames
170 * the user happens to have in the configuration file.
171 */
172 void init_diff_ui_defaults(void)
173 {
174 diff_detect_rename_default = 1;
175 }
176
177 int git_diff_ui_config(const char *var, const char *value, void *cb)
178 {
179 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
180 diff_use_color_default = git_config_colorbool(var, value);
181 return 0;
182 }
183 if (!strcmp(var, "diff.context")) {
184 diff_context_default = git_config_int(var, value);
185 if (diff_context_default < 0)
186 return -1;
187 return 0;
188 }
189 if (!strcmp(var, "diff.renames")) {
190 diff_detect_rename_default = git_config_rename(var, value);
191 return 0;
192 }
193 if (!strcmp(var, "diff.compactionheuristic")) {
194 diff_compaction_heuristic = git_config_bool(var, value);
195 return 0;
196 }
197 if (!strcmp(var, "diff.autorefreshindex")) {
198 diff_auto_refresh_index = git_config_bool(var, value);
199 return 0;
200 }
201 if (!strcmp(var, "diff.mnemonicprefix")) {
202 diff_mnemonic_prefix = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp(var, "diff.noprefix")) {
206 diff_no_prefix = git_config_bool(var, value);
207 return 0;
208 }
209 if (!strcmp(var, "diff.statgraphwidth")) {
210 diff_stat_graph_width = git_config_int(var, value);
211 return 0;
212 }
213 if (!strcmp(var, "diff.external"))
214 return git_config_string(&external_diff_cmd_cfg, var, value);
215 if (!strcmp(var, "diff.wordregex"))
216 return git_config_string(&diff_word_regex_cfg, var, value);
217 if (!strcmp(var, "diff.orderfile"))
218 return git_config_pathname(&diff_order_file_cfg, var, value);
219
220 if (!strcmp(var, "diff.ignoresubmodules"))
221 handle_ignore_submodules_arg(&default_diff_options, value);
222
223 if (!strcmp(var, "diff.submodule")) {
224 if (parse_submodule_params(&default_diff_options, value))
225 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
226 value);
227 return 0;
228 }
229
230 if (!strcmp(var, "diff.algorithm")) {
231 diff_algorithm = parse_algorithm_value(value);
232 if (diff_algorithm < 0)
233 return -1;
234 return 0;
235 }
236
237 if (git_color_config(var, value, cb) < 0)
238 return -1;
239
240 return git_diff_basic_config(var, value, cb);
241 }
242
243 int git_diff_basic_config(const char *var, const char *value, void *cb)
244 {
245 const char *name;
246
247 if (!strcmp(var, "diff.renamelimit")) {
248 diff_rename_limit_default = git_config_int(var, value);
249 return 0;
250 }
251
252 if (userdiff_config(var, value) < 0)
253 return -1;
254
255 if (skip_prefix(var, "diff.color.", &name) ||
256 skip_prefix(var, "color.diff.", &name)) {
257 int slot = parse_diff_color_slot(name);
258 if (slot < 0)
259 return 0;
260 if (!value)
261 return config_error_nonbool(var);
262 return color_parse(value, diff_colors[slot]);
263 }
264
265 /* like GNU diff's --suppress-blank-empty option */
266 if (!strcmp(var, "diff.suppressblankempty") ||
267 /* for backwards compatibility */
268 !strcmp(var, "diff.suppress-blank-empty")) {
269 diff_suppress_blank_empty = git_config_bool(var, value);
270 return 0;
271 }
272
273 if (!strcmp(var, "diff.dirstat")) {
274 struct strbuf errmsg = STRBUF_INIT;
275 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
276 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
277 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
278 errmsg.buf);
279 strbuf_release(&errmsg);
280 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
281 return 0;
282 }
283
284 if (starts_with(var, "submodule."))
285 return parse_submodule_config_option(var, value);
286
287 return git_default_config(var, value, cb);
288 }
289
290 static char *quote_two(const char *one, const char *two)
291 {
292 int need_one = quote_c_style(one, NULL, NULL, 1);
293 int need_two = quote_c_style(two, NULL, NULL, 1);
294 struct strbuf res = STRBUF_INIT;
295
296 if (need_one + need_two) {
297 strbuf_addch(&res, '"');
298 quote_c_style(one, &res, NULL, 1);
299 quote_c_style(two, &res, NULL, 1);
300 strbuf_addch(&res, '"');
301 } else {
302 strbuf_addstr(&res, one);
303 strbuf_addstr(&res, two);
304 }
305 return strbuf_detach(&res, NULL);
306 }
307
308 static const char *external_diff(void)
309 {
310 static const char *external_diff_cmd = NULL;
311 static int done_preparing = 0;
312
313 if (done_preparing)
314 return external_diff_cmd;
315 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
316 if (!external_diff_cmd)
317 external_diff_cmd = external_diff_cmd_cfg;
318 done_preparing = 1;
319 return external_diff_cmd;
320 }
321
322 /*
323 * Keep track of files used for diffing. Sometimes such an entry
324 * refers to a temporary file, sometimes to an existing file, and
325 * sometimes to "/dev/null".
326 */
327 static struct diff_tempfile {
328 /*
329 * filename external diff should read from, or NULL if this
330 * entry is currently not in use:
331 */
332 const char *name;
333
334 char hex[GIT_SHA1_HEXSZ + 1];
335 char mode[10];
336
337 /*
338 * If this diff_tempfile instance refers to a temporary file,
339 * this tempfile object is used to manage its lifetime.
340 */
341 struct tempfile tempfile;
342 } diff_temp[2];
343
344 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
345
346 struct emit_callback {
347 int color_diff;
348 unsigned ws_rule;
349 int blank_at_eof_in_preimage;
350 int blank_at_eof_in_postimage;
351 int lno_in_preimage;
352 int lno_in_postimage;
353 sane_truncate_fn truncate;
354 const char **label_path;
355 struct diff_words_data *diff_words;
356 struct diff_options *opt;
357 struct strbuf *header;
358 };
359
360 static int count_lines(const char *data, int size)
361 {
362 int count, ch, completely_empty = 1, nl_just_seen = 0;
363 count = 0;
364 while (0 < size--) {
365 ch = *data++;
366 if (ch == '\n') {
367 count++;
368 nl_just_seen = 1;
369 completely_empty = 0;
370 }
371 else {
372 nl_just_seen = 0;
373 completely_empty = 0;
374 }
375 }
376 if (completely_empty)
377 return 0;
378 if (!nl_just_seen)
379 count++; /* no trailing newline */
380 return count;
381 }
382
383 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
384 {
385 if (!DIFF_FILE_VALID(one)) {
386 mf->ptr = (char *)""; /* does not matter */
387 mf->size = 0;
388 return 0;
389 }
390 else if (diff_populate_filespec(one, 0))
391 return -1;
392
393 mf->ptr = one->data;
394 mf->size = one->size;
395 return 0;
396 }
397
398 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
399 static unsigned long diff_filespec_size(struct diff_filespec *one)
400 {
401 if (!DIFF_FILE_VALID(one))
402 return 0;
403 diff_populate_filespec(one, CHECK_SIZE_ONLY);
404 return one->size;
405 }
406
407 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
408 {
409 char *ptr = mf->ptr;
410 long size = mf->size;
411 int cnt = 0;
412
413 if (!size)
414 return cnt;
415 ptr += size - 1; /* pointing at the very end */
416 if (*ptr != '\n')
417 ; /* incomplete line */
418 else
419 ptr--; /* skip the last LF */
420 while (mf->ptr < ptr) {
421 char *prev_eol;
422 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
423 if (*prev_eol == '\n')
424 break;
425 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
426 break;
427 cnt++;
428 ptr = prev_eol - 1;
429 }
430 return cnt;
431 }
432
433 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
434 struct emit_callback *ecbdata)
435 {
436 int l1, l2, at;
437 unsigned ws_rule = ecbdata->ws_rule;
438 l1 = count_trailing_blank(mf1, ws_rule);
439 l2 = count_trailing_blank(mf2, ws_rule);
440 if (l2 <= l1) {
441 ecbdata->blank_at_eof_in_preimage = 0;
442 ecbdata->blank_at_eof_in_postimage = 0;
443 return;
444 }
445 at = count_lines(mf1->ptr, mf1->size);
446 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
447
448 at = count_lines(mf2->ptr, mf2->size);
449 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
450 }
451
452 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
453 int first, const char *line, int len)
454 {
455 int has_trailing_newline, has_trailing_carriage_return;
456 int nofirst;
457 FILE *file = o->file;
458
459 fputs(diff_line_prefix(o), file);
460
461 if (len == 0) {
462 has_trailing_newline = (first == '\n');
463 has_trailing_carriage_return = (!has_trailing_newline &&
464 (first == '\r'));
465 nofirst = has_trailing_newline || has_trailing_carriage_return;
466 } else {
467 has_trailing_newline = (len > 0 && line[len-1] == '\n');
468 if (has_trailing_newline)
469 len--;
470 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
471 if (has_trailing_carriage_return)
472 len--;
473 nofirst = 0;
474 }
475
476 if (len || !nofirst) {
477 fputs(set, file);
478 if (!nofirst)
479 fputc(first, file);
480 fwrite(line, len, 1, file);
481 fputs(reset, file);
482 }
483 if (has_trailing_carriage_return)
484 fputc('\r', file);
485 if (has_trailing_newline)
486 fputc('\n', file);
487 }
488
489 static void emit_line(struct diff_options *o, const char *set, const char *reset,
490 const char *line, int len)
491 {
492 emit_line_0(o, set, reset, line[0], line+1, len-1);
493 }
494
495 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
496 {
497 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
498 ecbdata->blank_at_eof_in_preimage &&
499 ecbdata->blank_at_eof_in_postimage &&
500 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
501 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
502 return 0;
503 return ws_blank_line(line, len, ecbdata->ws_rule);
504 }
505
506 static void emit_line_checked(const char *reset,
507 struct emit_callback *ecbdata,
508 const char *line, int len,
509 enum color_diff color,
510 unsigned ws_error_highlight,
511 char sign)
512 {
513 const char *set = diff_get_color(ecbdata->color_diff, color);
514 const char *ws = NULL;
515
516 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
517 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
518 if (!*ws)
519 ws = NULL;
520 }
521
522 if (!ws)
523 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
524 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
525 /* Blank line at EOF - paint '+' as well */
526 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
527 else {
528 /* Emit just the prefix, then the rest. */
529 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
530 ws_check_emit(line, len, ecbdata->ws_rule,
531 ecbdata->opt->file, set, reset, ws);
532 }
533 }
534
535 static void emit_add_line(const char *reset,
536 struct emit_callback *ecbdata,
537 const char *line, int len)
538 {
539 emit_line_checked(reset, ecbdata, line, len,
540 DIFF_FILE_NEW, WSEH_NEW, '+');
541 }
542
543 static void emit_del_line(const char *reset,
544 struct emit_callback *ecbdata,
545 const char *line, int len)
546 {
547 emit_line_checked(reset, ecbdata, line, len,
548 DIFF_FILE_OLD, WSEH_OLD, '-');
549 }
550
551 static void emit_context_line(const char *reset,
552 struct emit_callback *ecbdata,
553 const char *line, int len)
554 {
555 emit_line_checked(reset, ecbdata, line, len,
556 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
557 }
558
559 static void emit_hunk_header(struct emit_callback *ecbdata,
560 const char *line, int len)
561 {
562 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
563 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
564 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
565 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
566 static const char atat[2] = { '@', '@' };
567 const char *cp, *ep;
568 struct strbuf msgbuf = STRBUF_INIT;
569 int org_len = len;
570 int i = 1;
571
572 /*
573 * As a hunk header must begin with "@@ -<old>, +<new> @@",
574 * it always is at least 10 bytes long.
575 */
576 if (len < 10 ||
577 memcmp(line, atat, 2) ||
578 !(ep = memmem(line + 2, len - 2, atat, 2))) {
579 emit_line(ecbdata->opt, context, reset, line, len);
580 return;
581 }
582 ep += 2; /* skip over @@ */
583
584 /* The hunk header in fraginfo color */
585 strbuf_addstr(&msgbuf, frag);
586 strbuf_add(&msgbuf, line, ep - line);
587 strbuf_addstr(&msgbuf, reset);
588
589 /*
590 * trailing "\r\n"
591 */
592 for ( ; i < 3; i++)
593 if (line[len - i] == '\r' || line[len - i] == '\n')
594 len--;
595
596 /* blank before the func header */
597 for (cp = ep; ep - line < len; ep++)
598 if (*ep != ' ' && *ep != '\t')
599 break;
600 if (ep != cp) {
601 strbuf_addstr(&msgbuf, context);
602 strbuf_add(&msgbuf, cp, ep - cp);
603 strbuf_addstr(&msgbuf, reset);
604 }
605
606 if (ep < line + len) {
607 strbuf_addstr(&msgbuf, func);
608 strbuf_add(&msgbuf, ep, line + len - ep);
609 strbuf_addstr(&msgbuf, reset);
610 }
611
612 strbuf_add(&msgbuf, line + len, org_len - len);
613 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
614 strbuf_release(&msgbuf);
615 }
616
617 static struct diff_tempfile *claim_diff_tempfile(void) {
618 int i;
619 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
620 if (!diff_temp[i].name)
621 return diff_temp + i;
622 die("BUG: diff is failing to clean up its tempfiles");
623 }
624
625 static void remove_tempfile(void)
626 {
627 int i;
628 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
629 if (is_tempfile_active(&diff_temp[i].tempfile))
630 delete_tempfile(&diff_temp[i].tempfile);
631 diff_temp[i].name = NULL;
632 }
633 }
634
635 static void print_line_count(FILE *file, int count)
636 {
637 switch (count) {
638 case 0:
639 fprintf(file, "0,0");
640 break;
641 case 1:
642 fprintf(file, "1");
643 break;
644 default:
645 fprintf(file, "1,%d", count);
646 break;
647 }
648 }
649
650 static void emit_rewrite_lines(struct emit_callback *ecb,
651 int prefix, const char *data, int size)
652 {
653 const char *endp = NULL;
654 static const char *nneof = " No newline at end of file\n";
655 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
656
657 while (0 < size) {
658 int len;
659
660 endp = memchr(data, '\n', size);
661 len = endp ? (endp - data + 1) : size;
662 if (prefix != '+') {
663 ecb->lno_in_preimage++;
664 emit_del_line(reset, ecb, data, len);
665 } else {
666 ecb->lno_in_postimage++;
667 emit_add_line(reset, ecb, data, len);
668 }
669 size -= len;
670 data += len;
671 }
672 if (!endp) {
673 const char *context = diff_get_color(ecb->color_diff,
674 DIFF_CONTEXT);
675 putc('\n', ecb->opt->file);
676 emit_line_0(ecb->opt, context, reset, '\\',
677 nneof, strlen(nneof));
678 }
679 }
680
681 static void emit_rewrite_diff(const char *name_a,
682 const char *name_b,
683 struct diff_filespec *one,
684 struct diff_filespec *two,
685 struct userdiff_driver *textconv_one,
686 struct userdiff_driver *textconv_two,
687 struct diff_options *o)
688 {
689 int lc_a, lc_b;
690 const char *name_a_tab, *name_b_tab;
691 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
692 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
693 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
694 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
695 const char *a_prefix, *b_prefix;
696 char *data_one, *data_two;
697 size_t size_one, size_two;
698 struct emit_callback ecbdata;
699 const char *line_prefix = diff_line_prefix(o);
700
701 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
702 a_prefix = o->b_prefix;
703 b_prefix = o->a_prefix;
704 } else {
705 a_prefix = o->a_prefix;
706 b_prefix = o->b_prefix;
707 }
708
709 name_a += (*name_a == '/');
710 name_b += (*name_b == '/');
711 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
712 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
713
714 strbuf_reset(&a_name);
715 strbuf_reset(&b_name);
716 quote_two_c_style(&a_name, a_prefix, name_a, 0);
717 quote_two_c_style(&b_name, b_prefix, name_b, 0);
718
719 size_one = fill_textconv(textconv_one, one, &data_one);
720 size_two = fill_textconv(textconv_two, two, &data_two);
721
722 memset(&ecbdata, 0, sizeof(ecbdata));
723 ecbdata.color_diff = want_color(o->use_color);
724 ecbdata.ws_rule = whitespace_rule(name_b);
725 ecbdata.opt = o;
726 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
727 mmfile_t mf1, mf2;
728 mf1.ptr = (char *)data_one;
729 mf2.ptr = (char *)data_two;
730 mf1.size = size_one;
731 mf2.size = size_two;
732 check_blank_at_eof(&mf1, &mf2, &ecbdata);
733 }
734 ecbdata.lno_in_preimage = 1;
735 ecbdata.lno_in_postimage = 1;
736
737 lc_a = count_lines(data_one, size_one);
738 lc_b = count_lines(data_two, size_two);
739 fprintf(o->file,
740 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
741 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
742 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
743 line_prefix, fraginfo);
744 if (!o->irreversible_delete)
745 print_line_count(o->file, lc_a);
746 else
747 fprintf(o->file, "?,?");
748 fprintf(o->file, " +");
749 print_line_count(o->file, lc_b);
750 fprintf(o->file, " @@%s\n", reset);
751 if (lc_a && !o->irreversible_delete)
752 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
753 if (lc_b)
754 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
755 if (textconv_one)
756 free((char *)data_one);
757 if (textconv_two)
758 free((char *)data_two);
759 }
760
761 struct diff_words_buffer {
762 mmfile_t text;
763 long alloc;
764 struct diff_words_orig {
765 const char *begin, *end;
766 } *orig;
767 int orig_nr, orig_alloc;
768 };
769
770 static void diff_words_append(char *line, unsigned long len,
771 struct diff_words_buffer *buffer)
772 {
773 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
774 line++;
775 len--;
776 memcpy(buffer->text.ptr + buffer->text.size, line, len);
777 buffer->text.size += len;
778 buffer->text.ptr[buffer->text.size] = '\0';
779 }
780
781 struct diff_words_style_elem {
782 const char *prefix;
783 const char *suffix;
784 const char *color; /* NULL; filled in by the setup code if
785 * color is enabled */
786 };
787
788 struct diff_words_style {
789 enum diff_words_type type;
790 struct diff_words_style_elem new, old, ctx;
791 const char *newline;
792 };
793
794 static struct diff_words_style diff_words_styles[] = {
795 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
796 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
797 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
798 };
799
800 struct diff_words_data {
801 struct diff_words_buffer minus, plus;
802 const char *current_plus;
803 int last_minus;
804 struct diff_options *opt;
805 regex_t *word_regex;
806 enum diff_words_type type;
807 struct diff_words_style *style;
808 };
809
810 static int fn_out_diff_words_write_helper(FILE *fp,
811 struct diff_words_style_elem *st_el,
812 const char *newline,
813 size_t count, const char *buf,
814 const char *line_prefix)
815 {
816 int print = 0;
817
818 while (count) {
819 char *p = memchr(buf, '\n', count);
820 if (print)
821 fputs(line_prefix, fp);
822 if (p != buf) {
823 if (st_el->color && fputs(st_el->color, fp) < 0)
824 return -1;
825 if (fputs(st_el->prefix, fp) < 0 ||
826 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
827 fputs(st_el->suffix, fp) < 0)
828 return -1;
829 if (st_el->color && *st_el->color
830 && fputs(GIT_COLOR_RESET, fp) < 0)
831 return -1;
832 }
833 if (!p)
834 return 0;
835 if (fputs(newline, fp) < 0)
836 return -1;
837 count -= p + 1 - buf;
838 buf = p + 1;
839 print = 1;
840 }
841 return 0;
842 }
843
844 /*
845 * '--color-words' algorithm can be described as:
846 *
847 * 1. collect a the minus/plus lines of a diff hunk, divided into
848 * minus-lines and plus-lines;
849 *
850 * 2. break both minus-lines and plus-lines into words and
851 * place them into two mmfile_t with one word for each line;
852 *
853 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
854 *
855 * And for the common parts of the both file, we output the plus side text.
856 * diff_words->current_plus is used to trace the current position of the plus file
857 * which printed. diff_words->last_minus is used to trace the last minus word
858 * printed.
859 *
860 * For '--graph' to work with '--color-words', we need to output the graph prefix
861 * on each line of color words output. Generally, there are two conditions on
862 * which we should output the prefix.
863 *
864 * 1. diff_words->last_minus == 0 &&
865 * diff_words->current_plus == diff_words->plus.text.ptr
866 *
867 * that is: the plus text must start as a new line, and if there is no minus
868 * word printed, a graph prefix must be printed.
869 *
870 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
871 * *(diff_words->current_plus - 1) == '\n'
872 *
873 * that is: a graph prefix must be printed following a '\n'
874 */
875 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
876 {
877 if ((diff_words->last_minus == 0 &&
878 diff_words->current_plus == diff_words->plus.text.ptr) ||
879 (diff_words->current_plus > diff_words->plus.text.ptr &&
880 *(diff_words->current_plus - 1) == '\n')) {
881 return 1;
882 } else {
883 return 0;
884 }
885 }
886
887 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
888 {
889 struct diff_words_data *diff_words = priv;
890 struct diff_words_style *style = diff_words->style;
891 int minus_first, minus_len, plus_first, plus_len;
892 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
893 struct diff_options *opt = diff_words->opt;
894 const char *line_prefix;
895
896 if (line[0] != '@' || parse_hunk_header(line, len,
897 &minus_first, &minus_len, &plus_first, &plus_len))
898 return;
899
900 assert(opt);
901 line_prefix = diff_line_prefix(opt);
902
903 /* POSIX requires that first be decremented by one if len == 0... */
904 if (minus_len) {
905 minus_begin = diff_words->minus.orig[minus_first].begin;
906 minus_end =
907 diff_words->minus.orig[minus_first + minus_len - 1].end;
908 } else
909 minus_begin = minus_end =
910 diff_words->minus.orig[minus_first].end;
911
912 if (plus_len) {
913 plus_begin = diff_words->plus.orig[plus_first].begin;
914 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
915 } else
916 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
917
918 if (color_words_output_graph_prefix(diff_words)) {
919 fputs(line_prefix, diff_words->opt->file);
920 }
921 if (diff_words->current_plus != plus_begin) {
922 fn_out_diff_words_write_helper(diff_words->opt->file,
923 &style->ctx, style->newline,
924 plus_begin - diff_words->current_plus,
925 diff_words->current_plus, line_prefix);
926 if (*(plus_begin - 1) == '\n')
927 fputs(line_prefix, diff_words->opt->file);
928 }
929 if (minus_begin != minus_end) {
930 fn_out_diff_words_write_helper(diff_words->opt->file,
931 &style->old, style->newline,
932 minus_end - minus_begin, minus_begin,
933 line_prefix);
934 }
935 if (plus_begin != plus_end) {
936 fn_out_diff_words_write_helper(diff_words->opt->file,
937 &style->new, style->newline,
938 plus_end - plus_begin, plus_begin,
939 line_prefix);
940 }
941
942 diff_words->current_plus = plus_end;
943 diff_words->last_minus = minus_first;
944 }
945
946 /* This function starts looking at *begin, and returns 0 iff a word was found. */
947 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
948 int *begin, int *end)
949 {
950 if (word_regex && *begin < buffer->size) {
951 regmatch_t match[1];
952 if (!regexec_buf(word_regex, buffer->ptr + *begin,
953 buffer->size - *begin, 1, match, 0)) {
954 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
955 '\n', match[0].rm_eo - match[0].rm_so);
956 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
957 *begin += match[0].rm_so;
958 return *begin >= *end;
959 }
960 return -1;
961 }
962
963 /* find the next word */
964 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
965 (*begin)++;
966 if (*begin >= buffer->size)
967 return -1;
968
969 /* find the end of the word */
970 *end = *begin + 1;
971 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
972 (*end)++;
973
974 return 0;
975 }
976
977 /*
978 * This function splits the words in buffer->text, stores the list with
979 * newline separator into out, and saves the offsets of the original words
980 * in buffer->orig.
981 */
982 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
983 regex_t *word_regex)
984 {
985 int i, j;
986 long alloc = 0;
987
988 out->size = 0;
989 out->ptr = NULL;
990
991 /* fake an empty "0th" word */
992 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
993 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
994 buffer->orig_nr = 1;
995
996 for (i = 0; i < buffer->text.size; i++) {
997 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
998 return;
999
1000 /* store original boundaries */
1001 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1002 buffer->orig_alloc);
1003 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1004 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1005 buffer->orig_nr++;
1006
1007 /* store one word */
1008 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1009 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1010 out->ptr[out->size + j - i] = '\n';
1011 out->size += j - i + 1;
1012
1013 i = j - 1;
1014 }
1015 }
1016
1017 /* this executes the word diff on the accumulated buffers */
1018 static void diff_words_show(struct diff_words_data *diff_words)
1019 {
1020 xpparam_t xpp;
1021 xdemitconf_t xecfg;
1022 mmfile_t minus, plus;
1023 struct diff_words_style *style = diff_words->style;
1024
1025 struct diff_options *opt = diff_words->opt;
1026 const char *line_prefix;
1027
1028 assert(opt);
1029 line_prefix = diff_line_prefix(opt);
1030
1031 /* special case: only removal */
1032 if (!diff_words->plus.text.size) {
1033 fputs(line_prefix, diff_words->opt->file);
1034 fn_out_diff_words_write_helper(diff_words->opt->file,
1035 &style->old, style->newline,
1036 diff_words->minus.text.size,
1037 diff_words->minus.text.ptr, line_prefix);
1038 diff_words->minus.text.size = 0;
1039 return;
1040 }
1041
1042 diff_words->current_plus = diff_words->plus.text.ptr;
1043 diff_words->last_minus = 0;
1044
1045 memset(&xpp, 0, sizeof(xpp));
1046 memset(&xecfg, 0, sizeof(xecfg));
1047 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1048 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1049 xpp.flags = 0;
1050 /* as only the hunk header will be parsed, we need a 0-context */
1051 xecfg.ctxlen = 0;
1052 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1053 &xpp, &xecfg))
1054 die("unable to generate word diff");
1055 free(minus.ptr);
1056 free(plus.ptr);
1057 if (diff_words->current_plus != diff_words->plus.text.ptr +
1058 diff_words->plus.text.size) {
1059 if (color_words_output_graph_prefix(diff_words))
1060 fputs(line_prefix, diff_words->opt->file);
1061 fn_out_diff_words_write_helper(diff_words->opt->file,
1062 &style->ctx, style->newline,
1063 diff_words->plus.text.ptr + diff_words->plus.text.size
1064 - diff_words->current_plus, diff_words->current_plus,
1065 line_prefix);
1066 }
1067 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1068 }
1069
1070 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1071 static void diff_words_flush(struct emit_callback *ecbdata)
1072 {
1073 if (ecbdata->diff_words->minus.text.size ||
1074 ecbdata->diff_words->plus.text.size)
1075 diff_words_show(ecbdata->diff_words);
1076 }
1077
1078 static void diff_filespec_load_driver(struct diff_filespec *one)
1079 {
1080 /* Use already-loaded driver */
1081 if (one->driver)
1082 return;
1083
1084 if (S_ISREG(one->mode))
1085 one->driver = userdiff_find_by_path(one->path);
1086
1087 /* Fallback to default settings */
1088 if (!one->driver)
1089 one->driver = userdiff_find_by_name("default");
1090 }
1091
1092 static const char *userdiff_word_regex(struct diff_filespec *one)
1093 {
1094 diff_filespec_load_driver(one);
1095 return one->driver->word_regex;
1096 }
1097
1098 static void init_diff_words_data(struct emit_callback *ecbdata,
1099 struct diff_options *orig_opts,
1100 struct diff_filespec *one,
1101 struct diff_filespec *two)
1102 {
1103 int i;
1104 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1105 memcpy(o, orig_opts, sizeof(struct diff_options));
1106
1107 ecbdata->diff_words =
1108 xcalloc(1, sizeof(struct diff_words_data));
1109 ecbdata->diff_words->type = o->word_diff;
1110 ecbdata->diff_words->opt = o;
1111 if (!o->word_regex)
1112 o->word_regex = userdiff_word_regex(one);
1113 if (!o->word_regex)
1114 o->word_regex = userdiff_word_regex(two);
1115 if (!o->word_regex)
1116 o->word_regex = diff_word_regex_cfg;
1117 if (o->word_regex) {
1118 ecbdata->diff_words->word_regex = (regex_t *)
1119 xmalloc(sizeof(regex_t));
1120 if (regcomp(ecbdata->diff_words->word_regex,
1121 o->word_regex,
1122 REG_EXTENDED | REG_NEWLINE))
1123 die ("Invalid regular expression: %s",
1124 o->word_regex);
1125 }
1126 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1127 if (o->word_diff == diff_words_styles[i].type) {
1128 ecbdata->diff_words->style =
1129 &diff_words_styles[i];
1130 break;
1131 }
1132 }
1133 if (want_color(o->use_color)) {
1134 struct diff_words_style *st = ecbdata->diff_words->style;
1135 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1136 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1137 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1138 }
1139 }
1140
1141 static void free_diff_words_data(struct emit_callback *ecbdata)
1142 {
1143 if (ecbdata->diff_words) {
1144 diff_words_flush(ecbdata);
1145 free (ecbdata->diff_words->opt);
1146 free (ecbdata->diff_words->minus.text.ptr);
1147 free (ecbdata->diff_words->minus.orig);
1148 free (ecbdata->diff_words->plus.text.ptr);
1149 free (ecbdata->diff_words->plus.orig);
1150 if (ecbdata->diff_words->word_regex) {
1151 regfree(ecbdata->diff_words->word_regex);
1152 free(ecbdata->diff_words->word_regex);
1153 }
1154 free(ecbdata->diff_words);
1155 ecbdata->diff_words = NULL;
1156 }
1157 }
1158
1159 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1160 {
1161 if (want_color(diff_use_color))
1162 return diff_colors[ix];
1163 return "";
1164 }
1165
1166 const char *diff_line_prefix(struct diff_options *opt)
1167 {
1168 struct strbuf *msgbuf;
1169 if (!opt->output_prefix)
1170 return "";
1171
1172 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1173 return msgbuf->buf;
1174 }
1175
1176 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1177 {
1178 const char *cp;
1179 unsigned long allot;
1180 size_t l = len;
1181
1182 if (ecb->truncate)
1183 return ecb->truncate(line, len);
1184 cp = line;
1185 allot = l;
1186 while (0 < l) {
1187 (void) utf8_width(&cp, &l);
1188 if (!cp)
1189 break; /* truncated in the middle? */
1190 }
1191 return allot - l;
1192 }
1193
1194 static void find_lno(const char *line, struct emit_callback *ecbdata)
1195 {
1196 const char *p;
1197 ecbdata->lno_in_preimage = 0;
1198 ecbdata->lno_in_postimage = 0;
1199 p = strchr(line, '-');
1200 if (!p)
1201 return; /* cannot happen */
1202 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1203 p = strchr(p, '+');
1204 if (!p)
1205 return; /* cannot happen */
1206 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1207 }
1208
1209 static void fn_out_consume(void *priv, char *line, unsigned long len)
1210 {
1211 struct emit_callback *ecbdata = priv;
1212 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1213 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1214 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1215 struct diff_options *o = ecbdata->opt;
1216 const char *line_prefix = diff_line_prefix(o);
1217
1218 o->found_changes = 1;
1219
1220 if (ecbdata->header) {
1221 fprintf(o->file, "%s", ecbdata->header->buf);
1222 strbuf_reset(ecbdata->header);
1223 ecbdata->header = NULL;
1224 }
1225
1226 if (ecbdata->label_path[0]) {
1227 const char *name_a_tab, *name_b_tab;
1228
1229 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1230 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1231
1232 fprintf(o->file, "%s%s--- %s%s%s\n",
1233 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1234 fprintf(o->file, "%s%s+++ %s%s%s\n",
1235 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1236 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1237 }
1238
1239 if (diff_suppress_blank_empty
1240 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1241 line[0] = '\n';
1242 len = 1;
1243 }
1244
1245 if (line[0] == '@') {
1246 if (ecbdata->diff_words)
1247 diff_words_flush(ecbdata);
1248 len = sane_truncate_line(ecbdata, line, len);
1249 find_lno(line, ecbdata);
1250 emit_hunk_header(ecbdata, line, len);
1251 if (line[len-1] != '\n')
1252 putc('\n', o->file);
1253 return;
1254 }
1255
1256 if (ecbdata->diff_words) {
1257 if (line[0] == '-') {
1258 diff_words_append(line, len,
1259 &ecbdata->diff_words->minus);
1260 return;
1261 } else if (line[0] == '+') {
1262 diff_words_append(line, len,
1263 &ecbdata->diff_words->plus);
1264 return;
1265 } else if (starts_with(line, "\\ ")) {
1266 /*
1267 * Eat the "no newline at eof" marker as if we
1268 * saw a "+" or "-" line with nothing on it,
1269 * and return without diff_words_flush() to
1270 * defer processing. If this is the end of
1271 * preimage, more "+" lines may come after it.
1272 */
1273 return;
1274 }
1275 diff_words_flush(ecbdata);
1276 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1277 emit_line(o, context, reset, line, len);
1278 fputs("~\n", o->file);
1279 } else {
1280 /*
1281 * Skip the prefix character, if any. With
1282 * diff_suppress_blank_empty, there may be
1283 * none.
1284 */
1285 if (line[0] != '\n') {
1286 line++;
1287 len--;
1288 }
1289 emit_line(o, context, reset, line, len);
1290 }
1291 return;
1292 }
1293
1294 switch (line[0]) {
1295 case '+':
1296 ecbdata->lno_in_postimage++;
1297 emit_add_line(reset, ecbdata, line + 1, len - 1);
1298 break;
1299 case '-':
1300 ecbdata->lno_in_preimage++;
1301 emit_del_line(reset, ecbdata, line + 1, len - 1);
1302 break;
1303 case ' ':
1304 ecbdata->lno_in_postimage++;
1305 ecbdata->lno_in_preimage++;
1306 emit_context_line(reset, ecbdata, line + 1, len - 1);
1307 break;
1308 default:
1309 /* incomplete line at the end */
1310 ecbdata->lno_in_preimage++;
1311 emit_line(o, diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1312 reset, line, len);
1313 break;
1314 }
1315 }
1316
1317 static char *pprint_rename(const char *a, const char *b)
1318 {
1319 const char *old = a;
1320 const char *new = b;
1321 struct strbuf name = STRBUF_INIT;
1322 int pfx_length, sfx_length;
1323 int pfx_adjust_for_slash;
1324 int len_a = strlen(a);
1325 int len_b = strlen(b);
1326 int a_midlen, b_midlen;
1327 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1328 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1329
1330 if (qlen_a || qlen_b) {
1331 quote_c_style(a, &name, NULL, 0);
1332 strbuf_addstr(&name, " => ");
1333 quote_c_style(b, &name, NULL, 0);
1334 return strbuf_detach(&name, NULL);
1335 }
1336
1337 /* Find common prefix */
1338 pfx_length = 0;
1339 while (*old && *new && *old == *new) {
1340 if (*old == '/')
1341 pfx_length = old - a + 1;
1342 old++;
1343 new++;
1344 }
1345
1346 /* Find common suffix */
1347 old = a + len_a;
1348 new = b + len_b;
1349 sfx_length = 0;
1350 /*
1351 * If there is a common prefix, it must end in a slash. In
1352 * that case we let this loop run 1 into the prefix to see the
1353 * same slash.
1354 *
1355 * If there is no common prefix, we cannot do this as it would
1356 * underrun the input strings.
1357 */
1358 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1359 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1360 b + pfx_length - pfx_adjust_for_slash <= new &&
1361 *old == *new) {
1362 if (*old == '/')
1363 sfx_length = len_a - (old - a);
1364 old--;
1365 new--;
1366 }
1367
1368 /*
1369 * pfx{mid-a => mid-b}sfx
1370 * {pfx-a => pfx-b}sfx
1371 * pfx{sfx-a => sfx-b}
1372 * name-a => name-b
1373 */
1374 a_midlen = len_a - pfx_length - sfx_length;
1375 b_midlen = len_b - pfx_length - sfx_length;
1376 if (a_midlen < 0)
1377 a_midlen = 0;
1378 if (b_midlen < 0)
1379 b_midlen = 0;
1380
1381 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1382 if (pfx_length + sfx_length) {
1383 strbuf_add(&name, a, pfx_length);
1384 strbuf_addch(&name, '{');
1385 }
1386 strbuf_add(&name, a + pfx_length, a_midlen);
1387 strbuf_addstr(&name, " => ");
1388 strbuf_add(&name, b + pfx_length, b_midlen);
1389 if (pfx_length + sfx_length) {
1390 strbuf_addch(&name, '}');
1391 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1392 }
1393 return strbuf_detach(&name, NULL);
1394 }
1395
1396 struct diffstat_t {
1397 int nr;
1398 int alloc;
1399 struct diffstat_file {
1400 char *from_name;
1401 char *name;
1402 char *print_name;
1403 unsigned is_unmerged:1;
1404 unsigned is_binary:1;
1405 unsigned is_renamed:1;
1406 unsigned is_interesting:1;
1407 uintmax_t added, deleted;
1408 } **files;
1409 };
1410
1411 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1412 const char *name_a,
1413 const char *name_b)
1414 {
1415 struct diffstat_file *x;
1416 x = xcalloc(1, sizeof(*x));
1417 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1418 diffstat->files[diffstat->nr++] = x;
1419 if (name_b) {
1420 x->from_name = xstrdup(name_a);
1421 x->name = xstrdup(name_b);
1422 x->is_renamed = 1;
1423 }
1424 else {
1425 x->from_name = NULL;
1426 x->name = xstrdup(name_a);
1427 }
1428 return x;
1429 }
1430
1431 static void diffstat_consume(void *priv, char *line, unsigned long len)
1432 {
1433 struct diffstat_t *diffstat = priv;
1434 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1435
1436 if (line[0] == '+')
1437 x->added++;
1438 else if (line[0] == '-')
1439 x->deleted++;
1440 }
1441
1442 const char mime_boundary_leader[] = "------------";
1443
1444 static int scale_linear(int it, int width, int max_change)
1445 {
1446 if (!it)
1447 return 0;
1448 /*
1449 * make sure that at least one '-' or '+' is printed if
1450 * there is any change to this path. The easiest way is to
1451 * scale linearly as if the alloted width is one column shorter
1452 * than it is, and then add 1 to the result.
1453 */
1454 return 1 + (it * (width - 1) / max_change);
1455 }
1456
1457 static void show_name(FILE *file,
1458 const char *prefix, const char *name, int len)
1459 {
1460 fprintf(file, " %s%-*s |", prefix, len, name);
1461 }
1462
1463 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1464 {
1465 if (cnt <= 0)
1466 return;
1467 fprintf(file, "%s", set);
1468 while (cnt--)
1469 putc(ch, file);
1470 fprintf(file, "%s", reset);
1471 }
1472
1473 static void fill_print_name(struct diffstat_file *file)
1474 {
1475 char *pname;
1476
1477 if (file->print_name)
1478 return;
1479
1480 if (!file->is_renamed) {
1481 struct strbuf buf = STRBUF_INIT;
1482 if (quote_c_style(file->name, &buf, NULL, 0)) {
1483 pname = strbuf_detach(&buf, NULL);
1484 } else {
1485 pname = file->name;
1486 strbuf_release(&buf);
1487 }
1488 } else {
1489 pname = pprint_rename(file->from_name, file->name);
1490 }
1491 file->print_name = pname;
1492 }
1493
1494 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1495 {
1496 struct strbuf sb = STRBUF_INIT;
1497 int ret;
1498
1499 if (!files) {
1500 assert(insertions == 0 && deletions == 0);
1501 return fprintf(fp, "%s\n", " 0 files changed");
1502 }
1503
1504 strbuf_addf(&sb,
1505 (files == 1) ? " %d file changed" : " %d files changed",
1506 files);
1507
1508 /*
1509 * For binary diff, the caller may want to print "x files
1510 * changed" with insertions == 0 && deletions == 0.
1511 *
1512 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1513 * is probably less confusing (i.e skip over "2 files changed
1514 * but nothing about added/removed lines? Is this a bug in Git?").
1515 */
1516 if (insertions || deletions == 0) {
1517 strbuf_addf(&sb,
1518 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1519 insertions);
1520 }
1521
1522 if (deletions || insertions == 0) {
1523 strbuf_addf(&sb,
1524 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1525 deletions);
1526 }
1527 strbuf_addch(&sb, '\n');
1528 ret = fputs(sb.buf, fp);
1529 strbuf_release(&sb);
1530 return ret;
1531 }
1532
1533 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1534 {
1535 int i, len, add, del, adds = 0, dels = 0;
1536 uintmax_t max_change = 0, max_len = 0;
1537 int total_files = data->nr, count;
1538 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1539 const char *reset, *add_c, *del_c;
1540 const char *line_prefix = "";
1541 int extra_shown = 0;
1542
1543 if (data->nr == 0)
1544 return;
1545
1546 line_prefix = diff_line_prefix(options);
1547 count = options->stat_count ? options->stat_count : data->nr;
1548
1549 reset = diff_get_color_opt(options, DIFF_RESET);
1550 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1551 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1552
1553 /*
1554 * Find the longest filename and max number of changes
1555 */
1556 for (i = 0; (i < count) && (i < data->nr); i++) {
1557 struct diffstat_file *file = data->files[i];
1558 uintmax_t change = file->added + file->deleted;
1559
1560 if (!file->is_interesting && (change == 0)) {
1561 count++; /* not shown == room for one more */
1562 continue;
1563 }
1564 fill_print_name(file);
1565 len = strlen(file->print_name);
1566 if (max_len < len)
1567 max_len = len;
1568
1569 if (file->is_unmerged) {
1570 /* "Unmerged" is 8 characters */
1571 bin_width = bin_width < 8 ? 8 : bin_width;
1572 continue;
1573 }
1574 if (file->is_binary) {
1575 /* "Bin XXX -> YYY bytes" */
1576 int w = 14 + decimal_width(file->added)
1577 + decimal_width(file->deleted);
1578 bin_width = bin_width < w ? w : bin_width;
1579 /* Display change counts aligned with "Bin" */
1580 number_width = 3;
1581 continue;
1582 }
1583
1584 if (max_change < change)
1585 max_change = change;
1586 }
1587 count = i; /* where we can stop scanning in data->files[] */
1588
1589 /*
1590 * We have width = stat_width or term_columns() columns total.
1591 * We want a maximum of min(max_len, stat_name_width) for the name part.
1592 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1593 * We also need 1 for " " and 4 + decimal_width(max_change)
1594 * for " | NNNN " and one the empty column at the end, altogether
1595 * 6 + decimal_width(max_change).
1596 *
1597 * If there's not enough space, we will use the smaller of
1598 * stat_name_width (if set) and 5/8*width for the filename,
1599 * and the rest for constant elements + graph part, but no more
1600 * than stat_graph_width for the graph part.
1601 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1602 * for the standard terminal size).
1603 *
1604 * In other words: stat_width limits the maximum width, and
1605 * stat_name_width fixes the maximum width of the filename,
1606 * and is also used to divide available columns if there
1607 * aren't enough.
1608 *
1609 * Binary files are displayed with "Bin XXX -> YYY bytes"
1610 * instead of the change count and graph. This part is treated
1611 * similarly to the graph part, except that it is not
1612 * "scaled". If total width is too small to accommodate the
1613 * guaranteed minimum width of the filename part and the
1614 * separators and this message, this message will "overflow"
1615 * making the line longer than the maximum width.
1616 */
1617
1618 if (options->stat_width == -1)
1619 width = term_columns() - options->output_prefix_length;
1620 else
1621 width = options->stat_width ? options->stat_width : 80;
1622 number_width = decimal_width(max_change) > number_width ?
1623 decimal_width(max_change) : number_width;
1624
1625 if (options->stat_graph_width == -1)
1626 options->stat_graph_width = diff_stat_graph_width;
1627
1628 /*
1629 * Guarantee 3/8*16==6 for the graph part
1630 * and 5/8*16==10 for the filename part
1631 */
1632 if (width < 16 + 6 + number_width)
1633 width = 16 + 6 + number_width;
1634
1635 /*
1636 * First assign sizes that are wanted, ignoring available width.
1637 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1638 * starting from "XXX" should fit in graph_width.
1639 */
1640 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1641 if (options->stat_graph_width &&
1642 options->stat_graph_width < graph_width)
1643 graph_width = options->stat_graph_width;
1644
1645 name_width = (options->stat_name_width > 0 &&
1646 options->stat_name_width < max_len) ?
1647 options->stat_name_width : max_len;
1648
1649 /*
1650 * Adjust adjustable widths not to exceed maximum width
1651 */
1652 if (name_width + number_width + 6 + graph_width > width) {
1653 if (graph_width > width * 3/8 - number_width - 6) {
1654 graph_width = width * 3/8 - number_width - 6;
1655 if (graph_width < 6)
1656 graph_width = 6;
1657 }
1658
1659 if (options->stat_graph_width &&
1660 graph_width > options->stat_graph_width)
1661 graph_width = options->stat_graph_width;
1662 if (name_width > width - number_width - 6 - graph_width)
1663 name_width = width - number_width - 6 - graph_width;
1664 else
1665 graph_width = width - number_width - 6 - name_width;
1666 }
1667
1668 /*
1669 * From here name_width is the width of the name area,
1670 * and graph_width is the width of the graph area.
1671 * max_change is used to scale graph properly.
1672 */
1673 for (i = 0; i < count; i++) {
1674 const char *prefix = "";
1675 struct diffstat_file *file = data->files[i];
1676 char *name = file->print_name;
1677 uintmax_t added = file->added;
1678 uintmax_t deleted = file->deleted;
1679 int name_len;
1680
1681 if (!file->is_interesting && (added + deleted == 0))
1682 continue;
1683
1684 /*
1685 * "scale" the filename
1686 */
1687 len = name_width;
1688 name_len = strlen(name);
1689 if (name_width < name_len) {
1690 char *slash;
1691 prefix = "...";
1692 len -= 3;
1693 name += name_len - len;
1694 slash = strchr(name, '/');
1695 if (slash)
1696 name = slash;
1697 }
1698
1699 if (file->is_binary) {
1700 fprintf(options->file, "%s", line_prefix);
1701 show_name(options->file, prefix, name, len);
1702 fprintf(options->file, " %*s", number_width, "Bin");
1703 if (!added && !deleted) {
1704 putc('\n', options->file);
1705 continue;
1706 }
1707 fprintf(options->file, " %s%"PRIuMAX"%s",
1708 del_c, deleted, reset);
1709 fprintf(options->file, " -> ");
1710 fprintf(options->file, "%s%"PRIuMAX"%s",
1711 add_c, added, reset);
1712 fprintf(options->file, " bytes");
1713 fprintf(options->file, "\n");
1714 continue;
1715 }
1716 else if (file->is_unmerged) {
1717 fprintf(options->file, "%s", line_prefix);
1718 show_name(options->file, prefix, name, len);
1719 fprintf(options->file, " Unmerged\n");
1720 continue;
1721 }
1722
1723 /*
1724 * scale the add/delete
1725 */
1726 add = added;
1727 del = deleted;
1728
1729 if (graph_width <= max_change) {
1730 int total = scale_linear(add + del, graph_width, max_change);
1731 if (total < 2 && add && del)
1732 /* width >= 2 due to the sanity check */
1733 total = 2;
1734 if (add < del) {
1735 add = scale_linear(add, graph_width, max_change);
1736 del = total - add;
1737 } else {
1738 del = scale_linear(del, graph_width, max_change);
1739 add = total - del;
1740 }
1741 }
1742 fprintf(options->file, "%s", line_prefix);
1743 show_name(options->file, prefix, name, len);
1744 fprintf(options->file, " %*"PRIuMAX"%s",
1745 number_width, added + deleted,
1746 added + deleted ? " " : "");
1747 show_graph(options->file, '+', add, add_c, reset);
1748 show_graph(options->file, '-', del, del_c, reset);
1749 fprintf(options->file, "\n");
1750 }
1751
1752 for (i = 0; i < data->nr; i++) {
1753 struct diffstat_file *file = data->files[i];
1754 uintmax_t added = file->added;
1755 uintmax_t deleted = file->deleted;
1756
1757 if (file->is_unmerged ||
1758 (!file->is_interesting && (added + deleted == 0))) {
1759 total_files--;
1760 continue;
1761 }
1762
1763 if (!file->is_binary) {
1764 adds += added;
1765 dels += deleted;
1766 }
1767 if (i < count)
1768 continue;
1769 if (!extra_shown)
1770 fprintf(options->file, "%s ...\n", line_prefix);
1771 extra_shown = 1;
1772 }
1773 fprintf(options->file, "%s", line_prefix);
1774 print_stat_summary(options->file, total_files, adds, dels);
1775 }
1776
1777 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1778 {
1779 int i, adds = 0, dels = 0, total_files = data->nr;
1780
1781 if (data->nr == 0)
1782 return;
1783
1784 for (i = 0; i < data->nr; i++) {
1785 int added = data->files[i]->added;
1786 int deleted= data->files[i]->deleted;
1787
1788 if (data->files[i]->is_unmerged ||
1789 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1790 total_files--;
1791 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1792 adds += added;
1793 dels += deleted;
1794 }
1795 }
1796 fprintf(options->file, "%s", diff_line_prefix(options));
1797 print_stat_summary(options->file, total_files, adds, dels);
1798 }
1799
1800 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1801 {
1802 int i;
1803
1804 if (data->nr == 0)
1805 return;
1806
1807 for (i = 0; i < data->nr; i++) {
1808 struct diffstat_file *file = data->files[i];
1809
1810 fprintf(options->file, "%s", diff_line_prefix(options));
1811
1812 if (file->is_binary)
1813 fprintf(options->file, "-\t-\t");
1814 else
1815 fprintf(options->file,
1816 "%"PRIuMAX"\t%"PRIuMAX"\t",
1817 file->added, file->deleted);
1818 if (options->line_termination) {
1819 fill_print_name(file);
1820 if (!file->is_renamed)
1821 write_name_quoted(file->name, options->file,
1822 options->line_termination);
1823 else {
1824 fputs(file->print_name, options->file);
1825 putc(options->line_termination, options->file);
1826 }
1827 } else {
1828 if (file->is_renamed) {
1829 putc('\0', options->file);
1830 write_name_quoted(file->from_name, options->file, '\0');
1831 }
1832 write_name_quoted(file->name, options->file, '\0');
1833 }
1834 }
1835 }
1836
1837 struct dirstat_file {
1838 const char *name;
1839 unsigned long changed;
1840 };
1841
1842 struct dirstat_dir {
1843 struct dirstat_file *files;
1844 int alloc, nr, permille, cumulative;
1845 };
1846
1847 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1848 unsigned long changed, const char *base, int baselen)
1849 {
1850 unsigned long this_dir = 0;
1851 unsigned int sources = 0;
1852 const char *line_prefix = diff_line_prefix(opt);
1853
1854 while (dir->nr) {
1855 struct dirstat_file *f = dir->files;
1856 int namelen = strlen(f->name);
1857 unsigned long this;
1858 char *slash;
1859
1860 if (namelen < baselen)
1861 break;
1862 if (memcmp(f->name, base, baselen))
1863 break;
1864 slash = strchr(f->name + baselen, '/');
1865 if (slash) {
1866 int newbaselen = slash + 1 - f->name;
1867 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1868 sources++;
1869 } else {
1870 this = f->changed;
1871 dir->files++;
1872 dir->nr--;
1873 sources += 2;
1874 }
1875 this_dir += this;
1876 }
1877
1878 /*
1879 * We don't report dirstat's for
1880 * - the top level
1881 * - or cases where everything came from a single directory
1882 * under this directory (sources == 1).
1883 */
1884 if (baselen && sources != 1) {
1885 if (this_dir) {
1886 int permille = this_dir * 1000 / changed;
1887 if (permille >= dir->permille) {
1888 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1889 permille / 10, permille % 10, baselen, base);
1890 if (!dir->cumulative)
1891 return 0;
1892 }
1893 }
1894 }
1895 return this_dir;
1896 }
1897
1898 static int dirstat_compare(const void *_a, const void *_b)
1899 {
1900 const struct dirstat_file *a = _a;
1901 const struct dirstat_file *b = _b;
1902 return strcmp(a->name, b->name);
1903 }
1904
1905 static void show_dirstat(struct diff_options *options)
1906 {
1907 int i;
1908 unsigned long changed;
1909 struct dirstat_dir dir;
1910 struct diff_queue_struct *q = &diff_queued_diff;
1911
1912 dir.files = NULL;
1913 dir.alloc = 0;
1914 dir.nr = 0;
1915 dir.permille = options->dirstat_permille;
1916 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1917
1918 changed = 0;
1919 for (i = 0; i < q->nr; i++) {
1920 struct diff_filepair *p = q->queue[i];
1921 const char *name;
1922 unsigned long copied, added, damage;
1923 int content_changed;
1924
1925 name = p->two->path ? p->two->path : p->one->path;
1926
1927 if (p->one->oid_valid && p->two->oid_valid)
1928 content_changed = oidcmp(&p->one->oid, &p->two->oid);
1929 else
1930 content_changed = 1;
1931
1932 if (!content_changed) {
1933 /*
1934 * The SHA1 has not changed, so pre-/post-content is
1935 * identical. We can therefore skip looking at the
1936 * file contents altogether.
1937 */
1938 damage = 0;
1939 goto found_damage;
1940 }
1941
1942 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1943 /*
1944 * In --dirstat-by-file mode, we don't really need to
1945 * look at the actual file contents at all.
1946 * The fact that the SHA1 changed is enough for us to
1947 * add this file to the list of results
1948 * (with each file contributing equal damage).
1949 */
1950 damage = 1;
1951 goto found_damage;
1952 }
1953
1954 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1955 diff_populate_filespec(p->one, 0);
1956 diff_populate_filespec(p->two, 0);
1957 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1958 &copied, &added);
1959 diff_free_filespec_data(p->one);
1960 diff_free_filespec_data(p->two);
1961 } else if (DIFF_FILE_VALID(p->one)) {
1962 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1963 copied = added = 0;
1964 diff_free_filespec_data(p->one);
1965 } else if (DIFF_FILE_VALID(p->two)) {
1966 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1967 copied = 0;
1968 added = p->two->size;
1969 diff_free_filespec_data(p->two);
1970 } else
1971 continue;
1972
1973 /*
1974 * Original minus copied is the removed material,
1975 * added is the new material. They are both damages
1976 * made to the preimage.
1977 * If the resulting damage is zero, we know that
1978 * diffcore_count_changes() considers the two entries to
1979 * be identical, but since content_changed is true, we
1980 * know that there must have been _some_ kind of change,
1981 * so we force all entries to have damage > 0.
1982 */
1983 damage = (p->one->size - copied) + added;
1984 if (!damage)
1985 damage = 1;
1986
1987 found_damage:
1988 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1989 dir.files[dir.nr].name = name;
1990 dir.files[dir.nr].changed = damage;
1991 changed += damage;
1992 dir.nr++;
1993 }
1994
1995 /* This can happen even with many files, if everything was renames */
1996 if (!changed)
1997 return;
1998
1999 /* Show all directories with more than x% of the changes */
2000 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2001 gather_dirstat(options, &dir, changed, "", 0);
2002 }
2003
2004 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2005 {
2006 int i;
2007 unsigned long changed;
2008 struct dirstat_dir dir;
2009
2010 if (data->nr == 0)
2011 return;
2012
2013 dir.files = NULL;
2014 dir.alloc = 0;
2015 dir.nr = 0;
2016 dir.permille = options->dirstat_permille;
2017 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2018
2019 changed = 0;
2020 for (i = 0; i < data->nr; i++) {
2021 struct diffstat_file *file = data->files[i];
2022 unsigned long damage = file->added + file->deleted;
2023 if (file->is_binary)
2024 /*
2025 * binary files counts bytes, not lines. Must find some
2026 * way to normalize binary bytes vs. textual lines.
2027 * The following heuristic assumes that there are 64
2028 * bytes per "line".
2029 * This is stupid and ugly, but very cheap...
2030 */
2031 damage = (damage + 63) / 64;
2032 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2033 dir.files[dir.nr].name = file->name;
2034 dir.files[dir.nr].changed = damage;
2035 changed += damage;
2036 dir.nr++;
2037 }
2038
2039 /* This can happen even with many files, if everything was renames */
2040 if (!changed)
2041 return;
2042
2043 /* Show all directories with more than x% of the changes */
2044 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2045 gather_dirstat(options, &dir, changed, "", 0);
2046 }
2047
2048 static void free_diffstat_info(struct diffstat_t *diffstat)
2049 {
2050 int i;
2051 for (i = 0; i < diffstat->nr; i++) {
2052 struct diffstat_file *f = diffstat->files[i];
2053 if (f->name != f->print_name)
2054 free(f->print_name);
2055 free(f->name);
2056 free(f->from_name);
2057 free(f);
2058 }
2059 free(diffstat->files);
2060 }
2061
2062 struct checkdiff_t {
2063 const char *filename;
2064 int lineno;
2065 int conflict_marker_size;
2066 struct diff_options *o;
2067 unsigned ws_rule;
2068 unsigned status;
2069 };
2070
2071 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2072 {
2073 char firstchar;
2074 int cnt;
2075
2076 if (len < marker_size + 1)
2077 return 0;
2078 firstchar = line[0];
2079 switch (firstchar) {
2080 case '=': case '>': case '<': case '|':
2081 break;
2082 default:
2083 return 0;
2084 }
2085 for (cnt = 1; cnt < marker_size; cnt++)
2086 if (line[cnt] != firstchar)
2087 return 0;
2088 /* line[1] thru line[marker_size-1] are same as firstchar */
2089 if (len < marker_size + 1 || !isspace(line[marker_size]))
2090 return 0;
2091 return 1;
2092 }
2093
2094 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2095 {
2096 struct checkdiff_t *data = priv;
2097 int marker_size = data->conflict_marker_size;
2098 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2099 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2100 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2101 char *err;
2102 const char *line_prefix;
2103
2104 assert(data->o);
2105 line_prefix = diff_line_prefix(data->o);
2106
2107 if (line[0] == '+') {
2108 unsigned bad;
2109 data->lineno++;
2110 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2111 data->status |= 1;
2112 fprintf(data->o->file,
2113 "%s%s:%d: leftover conflict marker\n",
2114 line_prefix, data->filename, data->lineno);
2115 }
2116 bad = ws_check(line + 1, len - 1, data->ws_rule);
2117 if (!bad)
2118 return;
2119 data->status |= bad;
2120 err = whitespace_error_string(bad);
2121 fprintf(data->o->file, "%s%s:%d: %s.\n",
2122 line_prefix, data->filename, data->lineno, err);
2123 free(err);
2124 emit_line(data->o, set, reset, line, 1);
2125 ws_check_emit(line + 1, len - 1, data->ws_rule,
2126 data->o->file, set, reset, ws);
2127 } else if (line[0] == ' ') {
2128 data->lineno++;
2129 } else if (line[0] == '@') {
2130 char *plus = strchr(line, '+');
2131 if (plus)
2132 data->lineno = strtol(plus, NULL, 10) - 1;
2133 else
2134 die("invalid diff");
2135 }
2136 }
2137
2138 static unsigned char *deflate_it(char *data,
2139 unsigned long size,
2140 unsigned long *result_size)
2141 {
2142 int bound;
2143 unsigned char *deflated;
2144 git_zstream stream;
2145
2146 git_deflate_init(&stream, zlib_compression_level);
2147 bound = git_deflate_bound(&stream, size);
2148 deflated = xmalloc(bound);
2149 stream.next_out = deflated;
2150 stream.avail_out = bound;
2151
2152 stream.next_in = (unsigned char *)data;
2153 stream.avail_in = size;
2154 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2155 ; /* nothing */
2156 git_deflate_end(&stream);
2157 *result_size = stream.total_out;
2158 return deflated;
2159 }
2160
2161 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2162 const char *prefix)
2163 {
2164 void *cp;
2165 void *delta;
2166 void *deflated;
2167 void *data;
2168 unsigned long orig_size;
2169 unsigned long delta_size;
2170 unsigned long deflate_size;
2171 unsigned long data_size;
2172
2173 /* We could do deflated delta, or we could do just deflated two,
2174 * whichever is smaller.
2175 */
2176 delta = NULL;
2177 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2178 if (one->size && two->size) {
2179 delta = diff_delta(one->ptr, one->size,
2180 two->ptr, two->size,
2181 &delta_size, deflate_size);
2182 if (delta) {
2183 void *to_free = delta;
2184 orig_size = delta_size;
2185 delta = deflate_it(delta, delta_size, &delta_size);
2186 free(to_free);
2187 }
2188 }
2189
2190 if (delta && delta_size < deflate_size) {
2191 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2192 free(deflated);
2193 data = delta;
2194 data_size = delta_size;
2195 }
2196 else {
2197 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2198 free(delta);
2199 data = deflated;
2200 data_size = deflate_size;
2201 }
2202
2203 /* emit data encoded in base85 */
2204 cp = data;
2205 while (data_size) {
2206 int bytes = (52 < data_size) ? 52 : data_size;
2207 char line[70];
2208 data_size -= bytes;
2209 if (bytes <= 26)
2210 line[0] = bytes + 'A' - 1;
2211 else
2212 line[0] = bytes - 26 + 'a' - 1;
2213 encode_85(line + 1, cp, bytes);
2214 cp = (char *) cp + bytes;
2215 fprintf(file, "%s", prefix);
2216 fputs(line, file);
2217 fputc('\n', file);
2218 }
2219 fprintf(file, "%s\n", prefix);
2220 free(data);
2221 }
2222
2223 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2224 const char *prefix)
2225 {
2226 fprintf(file, "%sGIT binary patch\n", prefix);
2227 emit_binary_diff_body(file, one, two, prefix);
2228 emit_binary_diff_body(file, two, one, prefix);
2229 }
2230
2231 int diff_filespec_is_binary(struct diff_filespec *one)
2232 {
2233 if (one->is_binary == -1) {
2234 diff_filespec_load_driver(one);
2235 if (one->driver->binary != -1)
2236 one->is_binary = one->driver->binary;
2237 else {
2238 if (!one->data && DIFF_FILE_VALID(one))
2239 diff_populate_filespec(one, CHECK_BINARY);
2240 if (one->is_binary == -1 && one->data)
2241 one->is_binary = buffer_is_binary(one->data,
2242 one->size);
2243 if (one->is_binary == -1)
2244 one->is_binary = 0;
2245 }
2246 }
2247 return one->is_binary;
2248 }
2249
2250 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2251 {
2252 diff_filespec_load_driver(one);
2253 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2254 }
2255
2256 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2257 {
2258 if (!options->a_prefix)
2259 options->a_prefix = a;
2260 if (!options->b_prefix)
2261 options->b_prefix = b;
2262 }
2263
2264 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2265 {
2266 if (!DIFF_FILE_VALID(one))
2267 return NULL;
2268
2269 diff_filespec_load_driver(one);
2270 return userdiff_get_textconv(one->driver);
2271 }
2272
2273 static void builtin_diff(const char *name_a,
2274 const char *name_b,
2275 struct diff_filespec *one,
2276 struct diff_filespec *two,
2277 const char *xfrm_msg,
2278 int must_show_header,
2279 struct diff_options *o,
2280 int complete_rewrite)
2281 {
2282 mmfile_t mf1, mf2;
2283 const char *lbl[2];
2284 char *a_one, *b_two;
2285 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2286 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2287 const char *a_prefix, *b_prefix;
2288 struct userdiff_driver *textconv_one = NULL;
2289 struct userdiff_driver *textconv_two = NULL;
2290 struct strbuf header = STRBUF_INIT;
2291 const char *line_prefix = diff_line_prefix(o);
2292
2293 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2294 (!one->mode || S_ISGITLINK(one->mode)) &&
2295 (!two->mode || S_ISGITLINK(two->mode))) {
2296 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2297 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2298 show_submodule_summary(o->file, one->path ? one->path : two->path,
2299 line_prefix,
2300 one->oid.hash, two->oid.hash,
2301 two->dirty_submodule,
2302 meta, del, add, reset);
2303 return;
2304 }
2305
2306 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2307 textconv_one = get_textconv(one);
2308 textconv_two = get_textconv(two);
2309 }
2310
2311 diff_set_mnemonic_prefix(o, "a/", "b/");
2312 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2313 a_prefix = o->b_prefix;
2314 b_prefix = o->a_prefix;
2315 } else {
2316 a_prefix = o->a_prefix;
2317 b_prefix = o->b_prefix;
2318 }
2319
2320 /* Never use a non-valid filename anywhere if at all possible */
2321 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2322 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2323
2324 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2325 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2326 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2327 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2328 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2329 if (lbl[0][0] == '/') {
2330 /* /dev/null */
2331 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2332 if (xfrm_msg)
2333 strbuf_addstr(&header, xfrm_msg);
2334 must_show_header = 1;
2335 }
2336 else if (lbl[1][0] == '/') {
2337 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2338 if (xfrm_msg)
2339 strbuf_addstr(&header, xfrm_msg);
2340 must_show_header = 1;
2341 }
2342 else {
2343 if (one->mode != two->mode) {
2344 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2345 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2346 must_show_header = 1;
2347 }
2348 if (xfrm_msg)
2349 strbuf_addstr(&header, xfrm_msg);
2350
2351 /*
2352 * we do not run diff between different kind
2353 * of objects.
2354 */
2355 if ((one->mode ^ two->mode) & S_IFMT)
2356 goto free_ab_and_return;
2357 if (complete_rewrite &&
2358 (textconv_one || !diff_filespec_is_binary(one)) &&
2359 (textconv_two || !diff_filespec_is_binary(two))) {
2360 fprintf(o->file, "%s", header.buf);
2361 strbuf_reset(&header);
2362 emit_rewrite_diff(name_a, name_b, one, two,
2363 textconv_one, textconv_two, o);
2364 o->found_changes = 1;
2365 goto free_ab_and_return;
2366 }
2367 }
2368
2369 if (o->irreversible_delete && lbl[1][0] == '/') {
2370 fprintf(o->file, "%s", header.buf);
2371 strbuf_reset(&header);
2372 goto free_ab_and_return;
2373 } else if (!DIFF_OPT_TST(o, TEXT) &&
2374 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2375 (!textconv_two && diff_filespec_is_binary(two)) )) {
2376 if (!one->data && !two->data &&
2377 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2378 !DIFF_OPT_TST(o, BINARY)) {
2379 if (!oidcmp(&one->oid, &two->oid)) {
2380 if (must_show_header)
2381 fprintf(o->file, "%s", header.buf);
2382 goto free_ab_and_return;
2383 }
2384 fprintf(o->file, "%s", header.buf);
2385 fprintf(o->file, "%sBinary files %s and %s differ\n",
2386 line_prefix, lbl[0], lbl[1]);
2387 goto free_ab_and_return;
2388 }
2389 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2390 die("unable to read files to diff");
2391 /* Quite common confusing case */
2392 if (mf1.size == mf2.size &&
2393 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2394 if (must_show_header)
2395 fprintf(o->file, "%s", header.buf);
2396 goto free_ab_and_return;
2397 }
2398 fprintf(o->file, "%s", header.buf);
2399 strbuf_reset(&header);
2400 if (DIFF_OPT_TST(o, BINARY))
2401 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2402 else
2403 fprintf(o->file, "%sBinary files %s and %s differ\n",
2404 line_prefix, lbl[0], lbl[1]);
2405 o->found_changes = 1;
2406 } else {
2407 /* Crazy xdl interfaces.. */
2408 const char *diffopts = getenv("GIT_DIFF_OPTS");
2409 const char *v;
2410 xpparam_t xpp;
2411 xdemitconf_t xecfg;
2412 struct emit_callback ecbdata;
2413 const struct userdiff_funcname *pe;
2414
2415 if (must_show_header) {
2416 fprintf(o->file, "%s", header.buf);
2417 strbuf_reset(&header);
2418 }
2419
2420 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2421 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2422
2423 pe = diff_funcname_pattern(one);
2424 if (!pe)
2425 pe = diff_funcname_pattern(two);
2426
2427 memset(&xpp, 0, sizeof(xpp));
2428 memset(&xecfg, 0, sizeof(xecfg));
2429 memset(&ecbdata, 0, sizeof(ecbdata));
2430 ecbdata.label_path = lbl;
2431 ecbdata.color_diff = want_color(o->use_color);
2432 ecbdata.ws_rule = whitespace_rule(name_b);
2433 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2434 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2435 ecbdata.opt = o;
2436 ecbdata.header = header.len ? &header : NULL;
2437 xpp.flags = o->xdl_opts;
2438 xecfg.ctxlen = o->context;
2439 xecfg.interhunkctxlen = o->interhunkcontext;
2440 xecfg.flags = XDL_EMIT_FUNCNAMES;
2441 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2442 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2443 if (pe)
2444 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2445 if (!diffopts)
2446 ;
2447 else if (skip_prefix(diffopts, "--unified=", &v))
2448 xecfg.ctxlen = strtoul(v, NULL, 10);
2449 else if (skip_prefix(diffopts, "-u", &v))
2450 xecfg.ctxlen = strtoul(v, NULL, 10);
2451 if (o->word_diff)
2452 init_diff_words_data(&ecbdata, o, one, two);
2453 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2454 &xpp, &xecfg))
2455 die("unable to generate diff for %s", one->path);
2456 if (o->word_diff)
2457 free_diff_words_data(&ecbdata);
2458 if (textconv_one)
2459 free(mf1.ptr);
2460 if (textconv_two)
2461 free(mf2.ptr);
2462 xdiff_clear_find_func(&xecfg);
2463 }
2464
2465 free_ab_and_return:
2466 strbuf_release(&header);
2467 diff_free_filespec_data(one);
2468 diff_free_filespec_data(two);
2469 free(a_one);
2470 free(b_two);
2471 return;
2472 }
2473
2474 static void builtin_diffstat(const char *name_a, const char *name_b,
2475 struct diff_filespec *one,
2476 struct diff_filespec *two,
2477 struct diffstat_t *diffstat,
2478 struct diff_options *o,
2479 struct diff_filepair *p)
2480 {
2481 mmfile_t mf1, mf2;
2482 struct diffstat_file *data;
2483 int same_contents;
2484 int complete_rewrite = 0;
2485
2486 if (!DIFF_PAIR_UNMERGED(p)) {
2487 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2488 complete_rewrite = 1;
2489 }
2490
2491 data = diffstat_add(diffstat, name_a, name_b);
2492 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2493
2494 if (!one || !two) {
2495 data->is_unmerged = 1;
2496 return;
2497 }
2498
2499 same_contents = !oidcmp(&one->oid, &two->oid);
2500
2501 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2502 data->is_binary = 1;
2503 if (same_contents) {
2504 data->added = 0;
2505 data->deleted = 0;
2506 } else {
2507 data->added = diff_filespec_size(two);
2508 data->deleted = diff_filespec_size(one);
2509 }
2510 }
2511
2512 else if (complete_rewrite) {
2513 diff_populate_filespec(one, 0);
2514 diff_populate_filespec(two, 0);
2515 data->deleted = count_lines(one->data, one->size);
2516 data->added = count_lines(two->data, two->size);
2517 }
2518
2519 else if (!same_contents) {
2520 /* Crazy xdl interfaces.. */
2521 xpparam_t xpp;
2522 xdemitconf_t xecfg;
2523
2524 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2525 die("unable to read files to diff");
2526
2527 memset(&xpp, 0, sizeof(xpp));
2528 memset(&xecfg, 0, sizeof(xecfg));
2529 xpp.flags = o->xdl_opts;
2530 xecfg.ctxlen = o->context;
2531 xecfg.interhunkctxlen = o->interhunkcontext;
2532 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2533 &xpp, &xecfg))
2534 die("unable to generate diffstat for %s", one->path);
2535 }
2536
2537 diff_free_filespec_data(one);
2538 diff_free_filespec_data(two);
2539 }
2540
2541 static void builtin_checkdiff(const char *name_a, const char *name_b,
2542 const char *attr_path,
2543 struct diff_filespec *one,
2544 struct diff_filespec *two,
2545 struct diff_options *o)
2546 {
2547 mmfile_t mf1, mf2;
2548 struct checkdiff_t data;
2549
2550 if (!two)
2551 return;
2552
2553 memset(&data, 0, sizeof(data));
2554 data.filename = name_b ? name_b : name_a;
2555 data.lineno = 0;
2556 data.o = o;
2557 data.ws_rule = whitespace_rule(attr_path);
2558 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2559
2560 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2561 die("unable to read files to diff");
2562
2563 /*
2564 * All the other codepaths check both sides, but not checking
2565 * the "old" side here is deliberate. We are checking the newly
2566 * introduced changes, and as long as the "new" side is text, we
2567 * can and should check what it introduces.
2568 */
2569 if (diff_filespec_is_binary(two))
2570 goto free_and_return;
2571 else {
2572 /* Crazy xdl interfaces.. */
2573 xpparam_t xpp;
2574 xdemitconf_t xecfg;
2575
2576 memset(&xpp, 0, sizeof(xpp));
2577 memset(&xecfg, 0, sizeof(xecfg));
2578 xecfg.ctxlen = 1; /* at least one context line */
2579 xpp.flags = 0;
2580 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2581 &xpp, &xecfg))
2582 die("unable to generate checkdiff for %s", one->path);
2583
2584 if (data.ws_rule & WS_BLANK_AT_EOF) {
2585 struct emit_callback ecbdata;
2586 int blank_at_eof;
2587
2588 ecbdata.ws_rule = data.ws_rule;
2589 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2590 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2591
2592 if (blank_at_eof) {
2593 static char *err;
2594 if (!err)
2595 err = whitespace_error_string(WS_BLANK_AT_EOF);
2596 fprintf(o->file, "%s:%d: %s.\n",
2597 data.filename, blank_at_eof, err);
2598 data.status = 1; /* report errors */
2599 }
2600 }
2601 }
2602 free_and_return:
2603 diff_free_filespec_data(one);
2604 diff_free_filespec_data(two);
2605 if (data.status)
2606 DIFF_OPT_SET(o, CHECK_FAILED);
2607 }
2608
2609 struct diff_filespec *alloc_filespec(const char *path)
2610 {
2611 struct diff_filespec *spec;
2612
2613 FLEXPTR_ALLOC_STR(spec, path, path);
2614 spec->count = 1;
2615 spec->is_binary = -1;
2616 return spec;
2617 }
2618
2619 void free_filespec(struct diff_filespec *spec)
2620 {
2621 if (!--spec->count) {
2622 diff_free_filespec_data(spec);
2623 free(spec);
2624 }
2625 }
2626
2627 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2628 int sha1_valid, unsigned short mode)
2629 {
2630 if (mode) {
2631 spec->mode = canon_mode(mode);
2632 hashcpy(spec->oid.hash, sha1);
2633 spec->oid_valid = sha1_valid;
2634 }
2635 }
2636
2637 /*
2638 * Given a name and sha1 pair, if the index tells us the file in
2639 * the work tree has that object contents, return true, so that
2640 * prepare_temp_file() does not have to inflate and extract.
2641 */
2642 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2643 {
2644 const struct cache_entry *ce;
2645 struct stat st;
2646 int pos, len;
2647
2648 /*
2649 * We do not read the cache ourselves here, because the
2650 * benchmark with my previous version that always reads cache
2651 * shows that it makes things worse for diff-tree comparing
2652 * two linux-2.6 kernel trees in an already checked out work
2653 * tree. This is because most diff-tree comparisons deal with
2654 * only a small number of files, while reading the cache is
2655 * expensive for a large project, and its cost outweighs the
2656 * savings we get by not inflating the object to a temporary
2657 * file. Practically, this code only helps when we are used
2658 * by diff-cache --cached, which does read the cache before
2659 * calling us.
2660 */
2661 if (!active_cache)
2662 return 0;
2663
2664 /* We want to avoid the working directory if our caller
2665 * doesn't need the data in a normal file, this system
2666 * is rather slow with its stat/open/mmap/close syscalls,
2667 * and the object is contained in a pack file. The pack
2668 * is probably already open and will be faster to obtain
2669 * the data through than the working directory. Loose
2670 * objects however would tend to be slower as they need
2671 * to be individually opened and inflated.
2672 */
2673 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2674 return 0;
2675
2676 /*
2677 * Similarly, if we'd have to convert the file contents anyway, that
2678 * makes the optimization not worthwhile.
2679 */
2680 if (!want_file && would_convert_to_git(name))
2681 return 0;
2682
2683 len = strlen(name);
2684 pos = cache_name_pos(name, len);
2685 if (pos < 0)
2686 return 0;
2687 ce = active_cache[pos];
2688
2689 /*
2690 * This is not the sha1 we are looking for, or
2691 * unreusable because it is not a regular file.
2692 */
2693 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2694 return 0;
2695
2696 /*
2697 * If ce is marked as "assume unchanged", there is no
2698 * guarantee that work tree matches what we are looking for.
2699 */
2700 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2701 return 0;
2702
2703 /*
2704 * If ce matches the file in the work tree, we can reuse it.
2705 */
2706 if (ce_uptodate(ce) ||
2707 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2708 return 1;
2709
2710 return 0;
2711 }
2712
2713 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2714 {
2715 struct strbuf buf = STRBUF_INIT;
2716 char *dirty = "";
2717
2718 /* Are we looking at the work tree? */
2719 if (s->dirty_submodule)
2720 dirty = "-dirty";
2721
2722 strbuf_addf(&buf, "Subproject commit %s%s\n",
2723 oid_to_hex(&s->oid), dirty);
2724 s->size = buf.len;
2725 if (size_only) {
2726 s->data = NULL;
2727 strbuf_release(&buf);
2728 } else {
2729 s->data = strbuf_detach(&buf, NULL);
2730 s->should_free = 1;
2731 }
2732 return 0;
2733 }
2734
2735 /*
2736 * While doing rename detection and pickaxe operation, we may need to
2737 * grab the data for the blob (or file) for our own in-core comparison.
2738 * diff_filespec has data and size fields for this purpose.
2739 */
2740 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2741 {
2742 int size_only = flags & CHECK_SIZE_ONLY;
2743 int err = 0;
2744 /*
2745 * demote FAIL to WARN to allow inspecting the situation
2746 * instead of refusing.
2747 */
2748 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2749 ? SAFE_CRLF_WARN
2750 : safe_crlf);
2751
2752 if (!DIFF_FILE_VALID(s))
2753 die("internal error: asking to populate invalid file.");
2754 if (S_ISDIR(s->mode))
2755 return -1;
2756
2757 if (s->data)
2758 return 0;
2759
2760 if (size_only && 0 < s->size)
2761 return 0;
2762
2763 if (S_ISGITLINK(s->mode))
2764 return diff_populate_gitlink(s, size_only);
2765
2766 if (!s->oid_valid ||
2767 reuse_worktree_file(s->path, s->oid.hash, 0)) {
2768 struct strbuf buf = STRBUF_INIT;
2769 struct stat st;
2770 int fd;
2771
2772 if (lstat(s->path, &st) < 0) {
2773 if (errno == ENOENT) {
2774 err_empty:
2775 err = -1;
2776 empty:
2777 s->data = (char *)"";
2778 s->size = 0;
2779 return err;
2780 }
2781 }
2782 s->size = xsize_t(st.st_size);
2783 if (!s->size)
2784 goto empty;
2785 if (S_ISLNK(st.st_mode)) {
2786 struct strbuf sb = STRBUF_INIT;
2787
2788 if (strbuf_readlink(&sb, s->path, s->size))
2789 goto err_empty;
2790 s->size = sb.len;
2791 s->data = strbuf_detach(&sb, NULL);
2792 s->should_free = 1;
2793 return 0;
2794 }
2795 if (size_only)
2796 return 0;
2797 if ((flags & CHECK_BINARY) &&
2798 s->size > big_file_threshold && s->is_binary == -1) {
2799 s->is_binary = 1;
2800 return 0;
2801 }
2802 fd = open(s->path, O_RDONLY);
2803 if (fd < 0)
2804 goto err_empty;
2805 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2806 close(fd);
2807 s->should_munmap = 1;
2808
2809 /*
2810 * Convert from working tree format to canonical git format
2811 */
2812 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2813 size_t size = 0;
2814 munmap(s->data, s->size);
2815 s->should_munmap = 0;
2816 s->data = strbuf_detach(&buf, &size);
2817 s->size = size;
2818 s->should_free = 1;
2819 }
2820 }
2821 else {
2822 enum object_type type;
2823 if (size_only || (flags & CHECK_BINARY)) {
2824 type = sha1_object_info(s->oid.hash, &s->size);
2825 if (type < 0)
2826 die("unable to read %s",
2827 oid_to_hex(&s->oid));
2828 if (size_only)
2829 return 0;
2830 if (s->size > big_file_threshold && s->is_binary == -1) {
2831 s->is_binary = 1;
2832 return 0;
2833 }
2834 }
2835 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
2836 if (!s->data)
2837 die("unable to read %s", oid_to_hex(&s->oid));
2838 s->should_free = 1;
2839 }
2840 return 0;
2841 }
2842
2843 void diff_free_filespec_blob(struct diff_filespec *s)
2844 {
2845 if (s->should_free)
2846 free(s->data);
2847 else if (s->should_munmap)
2848 munmap(s->data, s->size);
2849
2850 if (s->should_free || s->should_munmap) {
2851 s->should_free = s->should_munmap = 0;
2852 s->data = NULL;
2853 }
2854 }
2855
2856 void diff_free_filespec_data(struct diff_filespec *s)
2857 {
2858 diff_free_filespec_blob(s);
2859 free(s->cnt_data);
2860 s->cnt_data = NULL;
2861 }
2862
2863 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2864 void *blob,
2865 unsigned long size,
2866 const struct object_id *oid,
2867 int mode)
2868 {
2869 int fd;
2870 struct strbuf buf = STRBUF_INIT;
2871 struct strbuf template = STRBUF_INIT;
2872 char *path_dup = xstrdup(path);
2873 const char *base = basename(path_dup);
2874
2875 /* Generate "XXXXXX_basename.ext" */
2876 strbuf_addstr(&template, "XXXXXX_");
2877 strbuf_addstr(&template, base);
2878
2879 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2880 if (fd < 0)
2881 die_errno("unable to create temp-file");
2882 if (convert_to_working_tree(path,
2883 (const char *)blob, (size_t)size, &buf)) {
2884 blob = buf.buf;
2885 size = buf.len;
2886 }
2887 if (write_in_full(fd, blob, size) != size)
2888 die_errno("unable to write temp-file");
2889 close_tempfile(&temp->tempfile);
2890 temp->name = get_tempfile_path(&temp->tempfile);
2891 oid_to_hex_r(temp->hex, oid);
2892 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2893 strbuf_release(&buf);
2894 strbuf_release(&template);
2895 free(path_dup);
2896 }
2897
2898 static struct diff_tempfile *prepare_temp_file(const char *name,
2899 struct diff_filespec *one)
2900 {
2901 struct diff_tempfile *temp = claim_diff_tempfile();
2902
2903 if (!DIFF_FILE_VALID(one)) {
2904 not_a_valid_file:
2905 /* A '-' entry produces this for file-2, and
2906 * a '+' entry produces this for file-1.
2907 */
2908 temp->name = "/dev/null";
2909 xsnprintf(temp->hex, sizeof(temp->hex), ".");
2910 xsnprintf(temp->mode, sizeof(temp->mode), ".");
2911 return temp;
2912 }
2913
2914 if (!S_ISGITLINK(one->mode) &&
2915 (!one->oid_valid ||
2916 reuse_worktree_file(name, one->oid.hash, 1))) {
2917 struct stat st;
2918 if (lstat(name, &st) < 0) {
2919 if (errno == ENOENT)
2920 goto not_a_valid_file;
2921 die_errno("stat(%s)", name);
2922 }
2923 if (S_ISLNK(st.st_mode)) {
2924 struct strbuf sb = STRBUF_INIT;
2925 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2926 die_errno("readlink(%s)", name);
2927 prep_temp_blob(name, temp, sb.buf, sb.len,
2928 (one->oid_valid ?
2929 &one->oid : &null_oid),
2930 (one->oid_valid ?
2931 one->mode : S_IFLNK));
2932 strbuf_release(&sb);
2933 }
2934 else {
2935 /* we can borrow from the file in the work tree */
2936 temp->name = name;
2937 if (!one->oid_valid)
2938 sha1_to_hex_r(temp->hex, null_sha1);
2939 else
2940 sha1_to_hex_r(temp->hex, one->oid.hash);
2941 /* Even though we may sometimes borrow the
2942 * contents from the work tree, we always want
2943 * one->mode. mode is trustworthy even when
2944 * !(one->sha1_valid), as long as
2945 * DIFF_FILE_VALID(one).
2946 */
2947 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
2948 }
2949 return temp;
2950 }
2951 else {
2952 if (diff_populate_filespec(one, 0))
2953 die("cannot read data blob for %s", one->path);
2954 prep_temp_blob(name, temp, one->data, one->size,
2955 &one->oid, one->mode);
2956 }
2957 return temp;
2958 }
2959
2960 static void add_external_diff_name(struct argv_array *argv,
2961 const char *name,
2962 struct diff_filespec *df)
2963 {
2964 struct diff_tempfile *temp = prepare_temp_file(name, df);
2965 argv_array_push(argv, temp->name);
2966 argv_array_push(argv, temp->hex);
2967 argv_array_push(argv, temp->mode);
2968 }
2969
2970 /* An external diff command takes:
2971 *
2972 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2973 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2974 *
2975 */
2976 static void run_external_diff(const char *pgm,
2977 const char *name,
2978 const char *other,
2979 struct diff_filespec *one,
2980 struct diff_filespec *two,
2981 const char *xfrm_msg,
2982 int complete_rewrite,
2983 struct diff_options *o)
2984 {
2985 struct argv_array argv = ARGV_ARRAY_INIT;
2986 struct argv_array env = ARGV_ARRAY_INIT;
2987 struct diff_queue_struct *q = &diff_queued_diff;
2988
2989 argv_array_push(&argv, pgm);
2990 argv_array_push(&argv, name);
2991
2992 if (one && two) {
2993 add_external_diff_name(&argv, name, one);
2994 if (!other)
2995 add_external_diff_name(&argv, name, two);
2996 else {
2997 add_external_diff_name(&argv, other, two);
2998 argv_array_push(&argv, other);
2999 argv_array_push(&argv, xfrm_msg);
3000 }
3001 }
3002
3003 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3004 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3005
3006 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3007 die(_("external diff died, stopping at %s"), name);
3008
3009 remove_tempfile();
3010 argv_array_clear(&argv);
3011 argv_array_clear(&env);
3012 }
3013
3014 static int similarity_index(struct diff_filepair *p)
3015 {
3016 return p->score * 100 / MAX_SCORE;
3017 }
3018
3019 static void fill_metainfo(struct strbuf *msg,
3020 const char *name,
3021 const char *other,
3022 struct diff_filespec *one,
3023 struct diff_filespec *two,
3024 struct diff_options *o,
3025 struct diff_filepair *p,
3026 int *must_show_header,
3027 int use_color)
3028 {
3029 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3030 const char *reset = diff_get_color(use_color, DIFF_RESET);
3031 const char *line_prefix = diff_line_prefix(o);
3032
3033 *must_show_header = 1;
3034 strbuf_init(msg, PATH_MAX * 2 + 300);
3035 switch (p->status) {
3036 case DIFF_STATUS_COPIED:
3037 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3038 line_prefix, set, similarity_index(p));
3039 strbuf_addf(msg, "%s\n%s%scopy from ",
3040 reset, line_prefix, set);
3041 quote_c_style(name, msg, NULL, 0);
3042 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3043 quote_c_style(other, msg, NULL, 0);
3044 strbuf_addf(msg, "%s\n", reset);
3045 break;
3046 case DIFF_STATUS_RENAMED:
3047 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3048 line_prefix, set, similarity_index(p));
3049 strbuf_addf(msg, "%s\n%s%srename from ",
3050 reset, line_prefix, set);
3051 quote_c_style(name, msg, NULL, 0);
3052 strbuf_addf(msg, "%s\n%s%srename to ",
3053 reset, line_prefix, set);
3054 quote_c_style(other, msg, NULL, 0);
3055 strbuf_addf(msg, "%s\n", reset);
3056 break;
3057 case DIFF_STATUS_MODIFIED:
3058 if (p->score) {
3059 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3060 line_prefix,
3061 set, similarity_index(p), reset);
3062 break;
3063 }
3064 /* fallthru */
3065 default:
3066 *must_show_header = 0;
3067 }
3068 if (one && two && oidcmp(&one->oid, &two->oid)) {
3069 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3070
3071 if (DIFF_OPT_TST(o, BINARY)) {
3072 mmfile_t mf;
3073 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3074 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3075 abbrev = 40;
3076 }
3077 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3078 find_unique_abbrev(one->oid.hash, abbrev));
3079 strbuf_addstr(msg, find_unique_abbrev(two->oid.hash, abbrev));
3080 if (one->mode == two->mode)
3081 strbuf_addf(msg, " %06o", one->mode);
3082 strbuf_addf(msg, "%s\n", reset);
3083 }
3084 }
3085
3086 static void run_diff_cmd(const char *pgm,
3087 const char *name,
3088 const char *other,
3089 const char *attr_path,
3090 struct diff_filespec *one,
3091 struct diff_filespec *two,
3092 struct strbuf *msg,
3093 struct diff_options *o,
3094 struct diff_filepair *p)
3095 {
3096 const char *xfrm_msg = NULL;
3097 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3098 int must_show_header = 0;
3099
3100
3101 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3102 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3103 if (drv && drv->external)
3104 pgm = drv->external;
3105 }
3106
3107 if (msg) {
3108 /*
3109 * don't use colors when the header is intended for an
3110 * external diff driver
3111 */
3112 fill_metainfo(msg, name, other, one, two, o, p,
3113 &must_show_header,
3114 want_color(o->use_color) && !pgm);
3115 xfrm_msg = msg->len ? msg->buf : NULL;
3116 }
3117
3118 if (pgm) {
3119 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3120 complete_rewrite, o);
3121 return;
3122 }
3123 if (one && two)
3124 builtin_diff(name, other ? other : name,
3125 one, two, xfrm_msg, must_show_header,
3126 o, complete_rewrite);
3127 else
3128 fprintf(o->file, "* Unmerged path %s\n", name);
3129 }
3130
3131 static void diff_fill_sha1_info(struct diff_filespec *one)
3132 {
3133 if (DIFF_FILE_VALID(one)) {
3134 if (!one->oid_valid) {
3135 struct stat st;
3136 if (one->is_stdin) {
3137 oidclr(&one->oid);
3138 return;
3139 }
3140 if (lstat(one->path, &st) < 0)
3141 die_errno("stat '%s'", one->path);
3142 if (index_path(one->oid.hash, one->path, &st, 0))
3143 die("cannot hash %s", one->path);
3144 }
3145 }
3146 else
3147 oidclr(&one->oid);
3148 }
3149
3150 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3151 {
3152 /* Strip the prefix but do not molest /dev/null and absolute paths */
3153 if (*namep && **namep != '/') {
3154 *namep += prefix_length;
3155 if (**namep == '/')
3156 ++*namep;
3157 }
3158 if (*otherp && **otherp != '/') {
3159 *otherp += prefix_length;
3160 if (**otherp == '/')
3161 ++*otherp;
3162 }
3163 }
3164
3165 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3166 {
3167 const char *pgm = external_diff();
3168 struct strbuf msg;
3169 struct diff_filespec *one = p->one;
3170 struct diff_filespec *two = p->two;
3171 const char *name;
3172 const char *other;
3173 const char *attr_path;
3174
3175 name = p->one->path;
3176 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3177 attr_path = name;
3178 if (o->prefix_length)
3179 strip_prefix(o->prefix_length, &name, &other);
3180
3181 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3182 pgm = NULL;
3183
3184 if (DIFF_PAIR_UNMERGED(p)) {
3185 run_diff_cmd(pgm, name, NULL, attr_path,
3186 NULL, NULL, NULL, o, p);
3187 return;
3188 }
3189
3190 diff_fill_sha1_info(one);
3191 diff_fill_sha1_info(two);
3192
3193 if (!pgm &&
3194 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3195 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3196 /*
3197 * a filepair that changes between file and symlink
3198 * needs to be split into deletion and creation.
3199 */
3200 struct diff_filespec *null = alloc_filespec(two->path);
3201 run_diff_cmd(NULL, name, other, attr_path,
3202 one, null, &msg, o, p);
3203 free(null);
3204 strbuf_release(&msg);
3205
3206 null = alloc_filespec(one->path);
3207 run_diff_cmd(NULL, name, other, attr_path,
3208 null, two, &msg, o, p);
3209 free(null);
3210 }
3211 else
3212 run_diff_cmd(pgm, name, other, attr_path,
3213 one, two, &msg, o, p);
3214
3215 strbuf_release(&msg);
3216 }
3217
3218 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3219 struct diffstat_t *diffstat)
3220 {
3221 const char *name;
3222 const char *other;
3223
3224 if (DIFF_PAIR_UNMERGED(p)) {
3225 /* unmerged */
3226 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3227 return;
3228 }
3229
3230 name = p->one->path;
3231 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3232
3233 if (o->prefix_length)
3234 strip_prefix(o->prefix_length, &name, &other);
3235
3236 diff_fill_sha1_info(p->one);
3237 diff_fill_sha1_info(p->two);
3238
3239 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3240 }
3241
3242 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3243 {
3244 const char *name;
3245 const char *other;
3246 const char *attr_path;
3247
3248 if (DIFF_PAIR_UNMERGED(p)) {
3249 /* unmerged */
3250 return;
3251 }
3252
3253 name = p->one->path;
3254 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3255 attr_path = other ? other : name;
3256
3257 if (o->prefix_length)
3258 strip_prefix(o->prefix_length, &name, &other);
3259
3260 diff_fill_sha1_info(p->one);
3261 diff_fill_sha1_info(p->two);
3262
3263 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3264 }
3265
3266 void diff_setup(struct diff_options *options)
3267 {
3268 memcpy(options, &default_diff_options, sizeof(*options));
3269
3270 options->file = stdout;
3271
3272 options->line_termination = '\n';
3273 options->break_opt = -1;
3274 options->rename_limit = -1;
3275 options->dirstat_permille = diff_dirstat_permille_default;
3276 options->context = diff_context_default;
3277 options->ws_error_highlight = WSEH_NEW;
3278 DIFF_OPT_SET(options, RENAME_EMPTY);
3279
3280 /* pathchange left =NULL by default */
3281 options->change = diff_change;
3282 options->add_remove = diff_addremove;
3283 options->use_color = diff_use_color_default;
3284 options->detect_rename = diff_detect_rename_default;
3285 options->xdl_opts |= diff_algorithm;
3286 if (diff_compaction_heuristic)
3287 DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
3288
3289 options->orderfile = diff_order_file_cfg;
3290
3291 if (diff_no_prefix) {
3292 options->a_prefix = options->b_prefix = "";
3293 } else if (!diff_mnemonic_prefix) {
3294 options->a_prefix = "a/";
3295 options->b_prefix = "b/";
3296 }
3297 }
3298
3299 void diff_setup_done(struct diff_options *options)
3300 {
3301 int count = 0;
3302
3303 if (options->set_default)
3304 options->set_default(options);
3305
3306 if (options->output_format & DIFF_FORMAT_NAME)
3307 count++;
3308 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3309 count++;
3310 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3311 count++;
3312 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3313 count++;
3314 if (count > 1)
3315 die("--name-only, --name-status, --check and -s are mutually exclusive");
3316
3317 /*
3318 * Most of the time we can say "there are changes"
3319 * only by checking if there are changed paths, but
3320 * --ignore-whitespace* options force us to look
3321 * inside contents.
3322 */
3323
3324 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3325 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3326 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3327 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3328 else
3329 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3330
3331 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3332 options->detect_rename = DIFF_DETECT_COPY;
3333
3334 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3335 options->prefix = NULL;
3336 if (options->prefix)
3337 options->prefix_length = strlen(options->prefix);
3338 else
3339 options->prefix_length = 0;
3340
3341 if (options->output_format & (DIFF_FORMAT_NAME |
3342 DIFF_FORMAT_NAME_STATUS |
3343 DIFF_FORMAT_CHECKDIFF |
3344 DIFF_FORMAT_NO_OUTPUT))
3345 options->output_format &= ~(DIFF_FORMAT_RAW |
3346 DIFF_FORMAT_NUMSTAT |
3347 DIFF_FORMAT_DIFFSTAT |
3348 DIFF_FORMAT_SHORTSTAT |
3349 DIFF_FORMAT_DIRSTAT |
3350 DIFF_FORMAT_SUMMARY |
3351 DIFF_FORMAT_PATCH);
3352
3353 /*
3354 * These cases always need recursive; we do not drop caller-supplied
3355 * recursive bits for other formats here.
3356 */
3357 if (options->output_format & (DIFF_FORMAT_PATCH |
3358 DIFF_FORMAT_NUMSTAT |
3359 DIFF_FORMAT_DIFFSTAT |
3360 DIFF_FORMAT_SHORTSTAT |
3361 DIFF_FORMAT_DIRSTAT |
3362 DIFF_FORMAT_SUMMARY |
3363 DIFF_FORMAT_CHECKDIFF))
3364 DIFF_OPT_SET(options, RECURSIVE);
3365 /*
3366 * Also pickaxe would not work very well if you do not say recursive
3367 */
3368 if (options->pickaxe)
3369 DIFF_OPT_SET(options, RECURSIVE);
3370 /*
3371 * When patches are generated, submodules diffed against the work tree
3372 * must be checked for dirtiness too so it can be shown in the output
3373 */
3374 if (options->output_format & DIFF_FORMAT_PATCH)
3375 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3376
3377 if (options->detect_rename && options->rename_limit < 0)
3378 options->rename_limit = diff_rename_limit_default;
3379 if (options->setup & DIFF_SETUP_USE_CACHE) {
3380 if (!active_cache)
3381 /* read-cache does not die even when it fails
3382 * so it is safe for us to do this here. Also
3383 * it does not smudge active_cache or active_nr
3384 * when it fails, so we do not have to worry about
3385 * cleaning it up ourselves either.
3386 */
3387 read_cache();
3388 }
3389 if (options->abbrev <= 0 || 40 < options->abbrev)
3390 options->abbrev = 40; /* full */
3391
3392 /*
3393 * It does not make sense to show the first hit we happened
3394 * to have found. It does not make sense not to return with
3395 * exit code in such a case either.
3396 */
3397 if (DIFF_OPT_TST(options, QUICK)) {
3398 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3399 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3400 }
3401
3402 options->diff_path_counter = 0;
3403
3404 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3405 die(_("--follow requires exactly one pathspec"));
3406 }
3407
3408 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3409 {
3410 char c, *eq;
3411 int len;
3412
3413 if (*arg != '-')
3414 return 0;
3415 c = *++arg;
3416 if (!c)
3417 return 0;
3418 if (c == arg_short) {
3419 c = *++arg;
3420 if (!c)
3421 return 1;
3422 if (val && isdigit(c)) {
3423 char *end;
3424 int n = strtoul(arg, &end, 10);
3425 if (*end)
3426 return 0;
3427 *val = n;
3428 return 1;
3429 }
3430 return 0;
3431 }
3432 if (c != '-')
3433 return 0;
3434 arg++;
3435 eq = strchrnul(arg, '=');
3436 len = eq - arg;
3437 if (!len || strncmp(arg, arg_long, len))
3438 return 0;
3439 if (*eq) {
3440 int n;
3441 char *end;
3442 if (!isdigit(*++eq))
3443 return 0;
3444 n = strtoul(eq, &end, 10);
3445 if (*end)
3446 return 0;
3447 *val = n;
3448 }
3449 return 1;
3450 }
3451
3452 static int diff_scoreopt_parse(const char *opt);
3453
3454 static inline int short_opt(char opt, const char **argv,
3455 const char **optarg)
3456 {
3457 const char *arg = argv[0];
3458 if (arg[0] != '-' || arg[1] != opt)
3459 return 0;
3460 if (arg[2] != '\0') {
3461 *optarg = arg + 2;
3462 return 1;
3463 }
3464 if (!argv[1])
3465 die("Option '%c' requires a value", opt);
3466 *optarg = argv[1];
3467 return 2;
3468 }
3469
3470 int parse_long_opt(const char *opt, const char **argv,
3471 const char **optarg)
3472 {
3473 const char *arg = argv[0];
3474 if (!skip_prefix(arg, "--", &arg))
3475 return 0;
3476 if (!skip_prefix(arg, opt, &arg))
3477 return 0;
3478 if (*arg == '=') { /* stuck form: --option=value */
3479 *optarg = arg + 1;
3480 return 1;
3481 }
3482 if (*arg != '\0')
3483 return 0;
3484 /* separate form: --option value */
3485 if (!argv[1])
3486 die("Option '--%s' requires a value", opt);
3487 *optarg = argv[1];
3488 return 2;
3489 }
3490
3491 static int stat_opt(struct diff_options *options, const char **av)
3492 {
3493 const char *arg = av[0];
3494 char *end;
3495 int width = options->stat_width;
3496 int name_width = options->stat_name_width;
3497 int graph_width = options->stat_graph_width;
3498 int count = options->stat_count;
3499 int argcount = 1;
3500
3501 if (!skip_prefix(arg, "--stat", &arg))
3502 die("BUG: stat option does not begin with --stat: %s", arg);
3503 end = (char *)arg;
3504
3505 switch (*arg) {
3506 case '-':
3507 if (skip_prefix(arg, "-width", &arg)) {
3508 if (*arg == '=')
3509 width = strtoul(arg + 1, &end, 10);
3510 else if (!*arg && !av[1])
3511 die("Option '--stat-width' requires a value");
3512 else if (!*arg) {
3513 width = strtoul(av[1], &end, 10);
3514 argcount = 2;
3515 }
3516 } else if (skip_prefix(arg, "-name-width", &arg)) {
3517 if (*arg == '=')
3518 name_width = strtoul(arg + 1, &end, 10);
3519 else if (!*arg && !av[1])
3520 die("Option '--stat-name-width' requires a value");
3521 else if (!*arg) {
3522 name_width = strtoul(av[1], &end, 10);
3523 argcount = 2;
3524 }
3525 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3526 if (*arg == '=')
3527 graph_width = strtoul(arg + 1, &end, 10);
3528 else if (!*arg && !av[1])
3529 die("Option '--stat-graph-width' requires a value");
3530 else if (!*arg) {
3531 graph_width = strtoul(av[1], &end, 10);
3532 argcount = 2;
3533 }
3534 } else if (skip_prefix(arg, "-count", &arg)) {
3535 if (*arg == '=')
3536 count = strtoul(arg + 1, &end, 10);
3537 else if (!*arg && !av[1])
3538 die("Option '--stat-count' requires a value");
3539 else if (!*arg) {
3540 count = strtoul(av[1], &end, 10);
3541 argcount = 2;
3542 }
3543 }
3544 break;
3545 case '=':
3546 width = strtoul(arg+1, &end, 10);
3547 if (*end == ',')
3548 name_width = strtoul(end+1, &end, 10);
3549 if (*end == ',')
3550 count = strtoul(end+1, &end, 10);
3551 }
3552
3553 /* Important! This checks all the error cases! */
3554 if (*end)
3555 return 0;
3556 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3557 options->stat_name_width = name_width;
3558 options->stat_graph_width = graph_width;
3559 options->stat_width = width;
3560 options->stat_count = count;
3561 return argcount;
3562 }
3563
3564 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3565 {
3566 struct strbuf errmsg = STRBUF_INIT;
3567 if (parse_dirstat_params(options, params, &errmsg))
3568 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3569 errmsg.buf);
3570 strbuf_release(&errmsg);
3571 /*
3572 * The caller knows a dirstat-related option is given from the command
3573 * line; allow it to say "return this_function();"
3574 */
3575 options->output_format |= DIFF_FORMAT_DIRSTAT;
3576 return 1;
3577 }
3578
3579 static int parse_submodule_opt(struct diff_options *options, const char *value)
3580 {
3581 if (parse_submodule_params(options, value))
3582 die(_("Failed to parse --submodule option parameter: '%s'"),
3583 value);
3584 return 1;
3585 }
3586
3587 static const char diff_status_letters[] = {
3588 DIFF_STATUS_ADDED,
3589 DIFF_STATUS_COPIED,
3590 DIFF_STATUS_DELETED,
3591 DIFF_STATUS_MODIFIED,
3592 DIFF_STATUS_RENAMED,
3593 DIFF_STATUS_TYPE_CHANGED,
3594 DIFF_STATUS_UNKNOWN,
3595 DIFF_STATUS_UNMERGED,
3596 DIFF_STATUS_FILTER_AON,
3597 DIFF_STATUS_FILTER_BROKEN,
3598 '\0',
3599 };
3600
3601 static unsigned int filter_bit['Z' + 1];
3602
3603 static void prepare_filter_bits(void)
3604 {
3605 int i;
3606
3607 if (!filter_bit[DIFF_STATUS_ADDED]) {
3608 for (i = 0; diff_status_letters[i]; i++)
3609 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3610 }
3611 }
3612
3613 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3614 {
3615 return opt->filter & filter_bit[(int) status];
3616 }
3617
3618 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3619 {
3620 int i, optch;
3621
3622 prepare_filter_bits();
3623
3624 /*
3625 * If there is a negation e.g. 'd' in the input, and we haven't
3626 * initialized the filter field with another --diff-filter, start
3627 * from full set of bits, except for AON.
3628 */
3629 if (!opt->filter) {
3630 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3631 if (optch < 'a' || 'z' < optch)
3632 continue;
3633 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3634 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3635 break;
3636 }
3637 }
3638
3639 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3640 unsigned int bit;
3641 int negate;
3642
3643 if ('a' <= optch && optch <= 'z') {
3644 negate = 1;
3645 optch = toupper(optch);
3646 } else {
3647 negate = 0;
3648 }
3649
3650 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3651 if (!bit)
3652 return optarg[i];
3653 if (negate)
3654 opt->filter &= ~bit;
3655 else
3656 opt->filter |= bit;
3657 }
3658 return 0;
3659 }
3660
3661 static void enable_patch_output(int *fmt) {
3662 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3663 *fmt |= DIFF_FORMAT_PATCH;
3664 }
3665
3666 static int parse_one_token(const char **arg, const char *token)
3667 {
3668 const char *rest;
3669 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3670 *arg = rest;
3671 return 1;
3672 }
3673 return 0;
3674 }
3675
3676 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3677 {
3678 const char *orig_arg = arg;
3679 unsigned val = 0;
3680 while (*arg) {
3681 if (parse_one_token(&arg, "none"))
3682 val = 0;
3683 else if (parse_one_token(&arg, "default"))
3684 val = WSEH_NEW;
3685 else if (parse_one_token(&arg, "all"))
3686 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3687 else if (parse_one_token(&arg, "new"))
3688 val |= WSEH_NEW;
3689 else if (parse_one_token(&arg, "old"))
3690 val |= WSEH_OLD;
3691 else if (parse_one_token(&arg, "context"))
3692 val |= WSEH_CONTEXT;
3693 else {
3694 error("unknown value after ws-error-highlight=%.*s",
3695 (int)(arg - orig_arg), orig_arg);
3696 return 0;
3697 }
3698 if (*arg)
3699 arg++;
3700 }
3701 opt->ws_error_highlight = val;
3702 return 1;
3703 }
3704
3705 int diff_opt_parse(struct diff_options *options,
3706 const char **av, int ac, const char *prefix)
3707 {
3708 const char *arg = av[0];
3709 const char *optarg;
3710 int argcount;
3711
3712 if (!prefix)
3713 prefix = "";
3714
3715 /* Output format options */
3716 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3717 || opt_arg(arg, 'U', "unified", &options->context))
3718 enable_patch_output(&options->output_format);
3719 else if (!strcmp(arg, "--raw"))
3720 options->output_format |= DIFF_FORMAT_RAW;
3721 else if (!strcmp(arg, "--patch-with-raw")) {
3722 enable_patch_output(&options->output_format);
3723 options->output_format |= DIFF_FORMAT_RAW;
3724 } else if (!strcmp(arg, "--numstat"))
3725 options->output_format |= DIFF_FORMAT_NUMSTAT;
3726 else if (!strcmp(arg, "--shortstat"))
3727 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3728 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3729 return parse_dirstat_opt(options, "");
3730 else if (skip_prefix(arg, "-X", &arg))
3731 return parse_dirstat_opt(options, arg);
3732 else if (skip_prefix(arg, "--dirstat=", &arg))
3733 return parse_dirstat_opt(options, arg);
3734 else if (!strcmp(arg, "--cumulative"))
3735 return parse_dirstat_opt(options, "cumulative");
3736 else if (!strcmp(arg, "--dirstat-by-file"))
3737 return parse_dirstat_opt(options, "files");
3738 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3739 parse_dirstat_opt(options, "files");
3740 return parse_dirstat_opt(options, arg);
3741 }
3742 else if (!strcmp(arg, "--check"))
3743 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3744 else if (!strcmp(arg, "--summary"))
3745 options->output_format |= DIFF_FORMAT_SUMMARY;
3746 else if (!strcmp(arg, "--patch-with-stat")) {
3747 enable_patch_output(&options->output_format);
3748 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3749 } else if (!strcmp(arg, "--name-only"))
3750 options->output_format |= DIFF_FORMAT_NAME;
3751 else if (!strcmp(arg, "--name-status"))
3752 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3753 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3754 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3755 else if (starts_with(arg, "--stat"))
3756 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3757 return stat_opt(options, av);
3758
3759 /* renames options */
3760 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3761 !strcmp(arg, "--break-rewrites")) {
3762 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3763 return error("invalid argument to -B: %s", arg+2);
3764 }
3765 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3766 !strcmp(arg, "--find-renames")) {
3767 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3768 return error("invalid argument to -M: %s", arg+2);
3769 options->detect_rename = DIFF_DETECT_RENAME;
3770 }
3771 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3772 options->irreversible_delete = 1;
3773 }
3774 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3775 !strcmp(arg, "--find-copies")) {
3776 if (options->detect_rename == DIFF_DETECT_COPY)
3777 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3778 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3779 return error("invalid argument to -C: %s", arg+2);
3780 options->detect_rename = DIFF_DETECT_COPY;
3781 }
3782 else if (!strcmp(arg, "--no-renames"))
3783 options->detect_rename = 0;
3784 else if (!strcmp(arg, "--rename-empty"))
3785 DIFF_OPT_SET(options, RENAME_EMPTY);
3786 else if (!strcmp(arg, "--no-rename-empty"))
3787 DIFF_OPT_CLR(options, RENAME_EMPTY);
3788 else if (!strcmp(arg, "--relative"))
3789 DIFF_OPT_SET(options, RELATIVE_NAME);
3790 else if (skip_prefix(arg, "--relative=", &arg)) {
3791 DIFF_OPT_SET(options, RELATIVE_NAME);
3792 options->prefix = arg;
3793 }
3794
3795 /* xdiff options */
3796 else if (!strcmp(arg, "--minimal"))
3797 DIFF_XDL_SET(options, NEED_MINIMAL);
3798 else if (!strcmp(arg, "--no-minimal"))
3799 DIFF_XDL_CLR(options, NEED_MINIMAL);
3800 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3801 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3802 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3803 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3804 else if (!strcmp(arg, "--ignore-space-at-eol"))
3805 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3806 else if (!strcmp(arg, "--ignore-blank-lines"))
3807 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3808 else if (!strcmp(arg, "--compaction-heuristic"))
3809 DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
3810 else if (!strcmp(arg, "--no-compaction-heuristic"))
3811 DIFF_XDL_CLR(options, COMPACTION_HEURISTIC);
3812 else if (!strcmp(arg, "--patience"))
3813 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3814 else if (!strcmp(arg, "--histogram"))
3815 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3816 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3817 long value = parse_algorithm_value(optarg);
3818 if (value < 0)
3819 return error("option diff-algorithm accepts \"myers\", "
3820 "\"minimal\", \"patience\" and \"histogram\"");
3821 /* clear out previous settings */
3822 DIFF_XDL_CLR(options, NEED_MINIMAL);
3823 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3824 options->xdl_opts |= value;
3825 return argcount;
3826 }
3827
3828 /* flags options */
3829 else if (!strcmp(arg, "--binary")) {
3830 enable_patch_output(&options->output_format);
3831 DIFF_OPT_SET(options, BINARY);
3832 }
3833 else if (!strcmp(arg, "--full-index"))
3834 DIFF_OPT_SET(options, FULL_INDEX);
3835 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3836 DIFF_OPT_SET(options, TEXT);
3837 else if (!strcmp(arg, "-R"))
3838 DIFF_OPT_SET(options, REVERSE_DIFF);
3839 else if (!strcmp(arg, "--find-copies-harder"))
3840 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3841 else if (!strcmp(arg, "--follow"))
3842 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3843 else if (!strcmp(arg, "--no-follow")) {
3844 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3845 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3846 } else if (!strcmp(arg, "--color"))
3847 options->use_color = 1;
3848 else if (skip_prefix(arg, "--color=", &arg)) {
3849 int value = git_config_colorbool(NULL, arg);
3850 if (value < 0)
3851 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3852 options->use_color = value;
3853 }
3854 else if (!strcmp(arg, "--no-color"))
3855 options->use_color = 0;
3856 else if (!strcmp(arg, "--color-words")) {
3857 options->use_color = 1;
3858 options->word_diff = DIFF_WORDS_COLOR;
3859 }
3860 else if (skip_prefix(arg, "--color-words=", &arg)) {
3861 options->use_color = 1;
3862 options->word_diff = DIFF_WORDS_COLOR;
3863 options->word_regex = arg;
3864 }
3865 else if (!strcmp(arg, "--word-diff")) {
3866 if (options->word_diff == DIFF_WORDS_NONE)
3867 options->word_diff = DIFF_WORDS_PLAIN;
3868 }
3869 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3870 if (!strcmp(arg, "plain"))
3871 options->word_diff = DIFF_WORDS_PLAIN;
3872 else if (!strcmp(arg, "color")) {
3873 options->use_color = 1;
3874 options->word_diff = DIFF_WORDS_COLOR;
3875 }
3876 else if (!strcmp(arg, "porcelain"))
3877 options->word_diff = DIFF_WORDS_PORCELAIN;
3878 else if (!strcmp(arg, "none"))
3879 options->word_diff = DIFF_WORDS_NONE;
3880 else
3881 die("bad --word-diff argument: %s", arg);
3882 }
3883 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3884 if (options->word_diff == DIFF_WORDS_NONE)
3885 options->word_diff = DIFF_WORDS_PLAIN;
3886 options->word_regex = optarg;
3887 return argcount;
3888 }
3889 else if (!strcmp(arg, "--exit-code"))
3890 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3891 else if (!strcmp(arg, "--quiet"))
3892 DIFF_OPT_SET(options, QUICK);
3893 else if (!strcmp(arg, "--ext-diff"))
3894 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3895 else if (!strcmp(arg, "--no-ext-diff"))
3896 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3897 else if (!strcmp(arg, "--textconv"))
3898 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3899 else if (!strcmp(arg, "--no-textconv"))
3900 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3901 else if (!strcmp(arg, "--ignore-submodules")) {
3902 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3903 handle_ignore_submodules_arg(options, "all");
3904 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3905 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3906 handle_ignore_submodules_arg(options, arg);
3907 } else if (!strcmp(arg, "--submodule"))
3908 DIFF_OPT_SET(options, SUBMODULE_LOG);
3909 else if (skip_prefix(arg, "--submodule=", &arg))
3910 return parse_submodule_opt(options, arg);
3911 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3912 return parse_ws_error_highlight(options, arg);
3913
3914 /* misc options */
3915 else if (!strcmp(arg, "-z"))
3916 options->line_termination = 0;
3917 else if ((argcount = short_opt('l', av, &optarg))) {
3918 options->rename_limit = strtoul(optarg, NULL, 10);
3919 return argcount;
3920 }
3921 else if ((argcount = short_opt('S', av, &optarg))) {
3922 options->pickaxe = optarg;
3923 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3924 return argcount;
3925 } else if ((argcount = short_opt('G', av, &optarg))) {
3926 options->pickaxe = optarg;
3927 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3928 return argcount;
3929 }
3930 else if (!strcmp(arg, "--pickaxe-all"))
3931 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3932 else if (!strcmp(arg, "--pickaxe-regex"))
3933 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3934 else if ((argcount = short_opt('O', av, &optarg))) {
3935 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3936 options->orderfile = xstrdup(path);
3937 return argcount;
3938 }
3939 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3940 int offending = parse_diff_filter_opt(optarg, options);
3941 if (offending)
3942 die("unknown change class '%c' in --diff-filter=%s",
3943 offending, optarg);
3944 return argcount;
3945 }
3946 else if (!strcmp(arg, "--abbrev"))
3947 options->abbrev = DEFAULT_ABBREV;
3948 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3949 options->abbrev = strtoul(arg, NULL, 10);
3950 if (options->abbrev < MINIMUM_ABBREV)
3951 options->abbrev = MINIMUM_ABBREV;
3952 else if (40 < options->abbrev)
3953 options->abbrev = 40;
3954 }
3955 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3956 options->a_prefix = optarg;
3957 return argcount;
3958 }
3959 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3960 options->b_prefix = optarg;
3961 return argcount;
3962 }
3963 else if (!strcmp(arg, "--no-prefix"))
3964 options->a_prefix = options->b_prefix = "";
3965 else if (opt_arg(arg, '\0', "inter-hunk-context",
3966 &options->interhunkcontext))
3967 ;
3968 else if (!strcmp(arg, "-W"))
3969 DIFF_OPT_SET(options, FUNCCONTEXT);
3970 else if (!strcmp(arg, "--function-context"))
3971 DIFF_OPT_SET(options, FUNCCONTEXT);
3972 else if (!strcmp(arg, "--no-function-context"))
3973 DIFF_OPT_CLR(options, FUNCCONTEXT);
3974 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3975 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3976 options->file = fopen(path, "w");
3977 if (!options->file)
3978 die_errno("Could not open '%s'", path);
3979 options->close_file = 1;
3980 if (options->use_color != GIT_COLOR_ALWAYS)
3981 options->use_color = GIT_COLOR_NEVER;
3982 return argcount;
3983 } else
3984 return 0;
3985 return 1;
3986 }
3987
3988 int parse_rename_score(const char **cp_p)
3989 {
3990 unsigned long num, scale;
3991 int ch, dot;
3992 const char *cp = *cp_p;
3993
3994 num = 0;
3995 scale = 1;
3996 dot = 0;
3997 for (;;) {
3998 ch = *cp;
3999 if ( !dot && ch == '.' ) {
4000 scale = 1;
4001 dot = 1;
4002 } else if ( ch == '%' ) {
4003 scale = dot ? scale*100 : 100;
4004 cp++; /* % is always at the end */
4005 break;
4006 } else if ( ch >= '0' && ch <= '9' ) {
4007 if ( scale < 100000 ) {
4008 scale *= 10;
4009 num = (num*10) + (ch-'0');
4010 }
4011 } else {
4012 break;
4013 }
4014 cp++;
4015 }
4016 *cp_p = cp;
4017
4018 /* user says num divided by scale and we say internally that
4019 * is MAX_SCORE * num / scale.
4020 */
4021 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4022 }
4023
4024 static int diff_scoreopt_parse(const char *opt)
4025 {
4026 int opt1, opt2, cmd;
4027
4028 if (*opt++ != '-')
4029 return -1;
4030 cmd = *opt++;
4031 if (cmd == '-') {
4032 /* convert the long-form arguments into short-form versions */
4033 if (skip_prefix(opt, "break-rewrites", &opt)) {
4034 if (*opt == 0 || *opt++ == '=')
4035 cmd = 'B';
4036 } else if (skip_prefix(opt, "find-copies", &opt)) {
4037 if (*opt == 0 || *opt++ == '=')
4038 cmd = 'C';
4039 } else if (skip_prefix(opt, "find-renames", &opt)) {
4040 if (*opt == 0 || *opt++ == '=')
4041 cmd = 'M';
4042 }
4043 }
4044 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4045 return -1; /* that is not a -M, -C, or -B option */
4046
4047 opt1 = parse_rename_score(&opt);
4048 if (cmd != 'B')
4049 opt2 = 0;
4050 else {
4051 if (*opt == 0)
4052 opt2 = 0;
4053 else if (*opt != '/')
4054 return -1; /* we expect -B80/99 or -B80 */
4055 else {
4056 opt++;
4057 opt2 = parse_rename_score(&opt);
4058 }
4059 }
4060 if (*opt != 0)
4061 return -1;
4062 return opt1 | (opt2 << 16);
4063 }
4064
4065 struct diff_queue_struct diff_queued_diff;
4066
4067 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4068 {
4069 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4070 queue->queue[queue->nr++] = dp;
4071 }
4072
4073 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4074 struct diff_filespec *one,
4075 struct diff_filespec *two)
4076 {
4077 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4078 dp->one = one;
4079 dp->two = two;
4080 if (queue)
4081 diff_q(queue, dp);
4082 return dp;
4083 }
4084
4085 void diff_free_filepair(struct diff_filepair *p)
4086 {
4087 free_filespec(p->one);
4088 free_filespec(p->two);
4089 free(p);
4090 }
4091
4092 /* This is different from find_unique_abbrev() in that
4093 * it stuffs the result with dots for alignment.
4094 */
4095 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4096 {
4097 int abblen;
4098 const char *abbrev;
4099 if (len == 40)
4100 return sha1_to_hex(sha1);
4101
4102 abbrev = find_unique_abbrev(sha1, len);
4103 abblen = strlen(abbrev);
4104 if (abblen < 37) {
4105 static char hex[41];
4106 if (len < abblen && abblen <= len + 2)
4107 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4108 else
4109 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4110 return hex;
4111 }
4112 return sha1_to_hex(sha1);
4113 }
4114
4115 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4116 {
4117 int line_termination = opt->line_termination;
4118 int inter_name_termination = line_termination ? '\t' : '\0';
4119
4120 fprintf(opt->file, "%s", diff_line_prefix(opt));
4121 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4122 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4123 diff_unique_abbrev(p->one->oid.hash, opt->abbrev));
4124 fprintf(opt->file, "%s ",
4125 diff_unique_abbrev(p->two->oid.hash, opt->abbrev));
4126 }
4127 if (p->score) {
4128 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4129 inter_name_termination);
4130 } else {
4131 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4132 }
4133
4134 if (p->status == DIFF_STATUS_COPIED ||
4135 p->status == DIFF_STATUS_RENAMED) {
4136 const char *name_a, *name_b;
4137 name_a = p->one->path;
4138 name_b = p->two->path;
4139 strip_prefix(opt->prefix_length, &name_a, &name_b);
4140 write_name_quoted(name_a, opt->file, inter_name_termination);
4141 write_name_quoted(name_b, opt->file, line_termination);
4142 } else {
4143 const char *name_a, *name_b;
4144 name_a = p->one->mode ? p->one->path : p->two->path;
4145 name_b = NULL;
4146 strip_prefix(opt->prefix_length, &name_a, &name_b);
4147 write_name_quoted(name_a, opt->file, line_termination);
4148 }
4149 }
4150
4151 int diff_unmodified_pair(struct diff_filepair *p)
4152 {
4153 /* This function is written stricter than necessary to support
4154 * the currently implemented transformers, but the idea is to
4155 * let transformers to produce diff_filepairs any way they want,
4156 * and filter and clean them up here before producing the output.
4157 */
4158 struct diff_filespec *one = p->one, *two = p->two;
4159
4160 if (DIFF_PAIR_UNMERGED(p))
4161 return 0; /* unmerged is interesting */
4162
4163 /* deletion, addition, mode or type change
4164 * and rename are all interesting.
4165 */
4166 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4167 DIFF_PAIR_MODE_CHANGED(p) ||
4168 strcmp(one->path, two->path))
4169 return 0;
4170
4171 /* both are valid and point at the same path. that is, we are
4172 * dealing with a change.
4173 */
4174 if (one->oid_valid && two->oid_valid &&
4175 !oidcmp(&one->oid, &two->oid) &&
4176 !one->dirty_submodule && !two->dirty_submodule)
4177 return 1; /* no change */
4178 if (!one->oid_valid && !two->oid_valid)
4179 return 1; /* both look at the same file on the filesystem. */
4180 return 0;
4181 }
4182
4183 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4184 {
4185 if (diff_unmodified_pair(p))
4186 return;
4187
4188 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4189 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4190 return; /* no tree diffs in patch format */
4191
4192 run_diff(p, o);
4193 }
4194
4195 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4196 struct diffstat_t *diffstat)
4197 {
4198 if (diff_unmodified_pair(p))
4199 return;
4200
4201 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4202 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4203 return; /* no useful stat for tree diffs */
4204
4205 run_diffstat(p, o, diffstat);
4206 }
4207
4208 static void diff_flush_checkdiff(struct diff_filepair *p,
4209 struct diff_options *o)
4210 {
4211 if (diff_unmodified_pair(p))
4212 return;
4213
4214 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4215 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4216 return; /* nothing to check in tree diffs */
4217
4218 run_checkdiff(p, o);
4219 }
4220
4221 int diff_queue_is_empty(void)
4222 {
4223 struct diff_queue_struct *q = &diff_queued_diff;
4224 int i;
4225 for (i = 0; i < q->nr; i++)
4226 if (!diff_unmodified_pair(q->queue[i]))
4227 return 0;
4228 return 1;
4229 }
4230
4231 #if DIFF_DEBUG
4232 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4233 {
4234 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4235 x, one ? one : "",
4236 s->path,
4237 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4238 s->mode,
4239 s->oid_valid ? oid_to_hex(&s->oid) : "");
4240 fprintf(stderr, "queue[%d] %s size %lu\n",
4241 x, one ? one : "",
4242 s->size);
4243 }
4244
4245 void diff_debug_filepair(const struct diff_filepair *p, int i)
4246 {
4247 diff_debug_filespec(p->one, i, "one");
4248 diff_debug_filespec(p->two, i, "two");
4249 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4250 p->score, p->status ? p->status : '?',
4251 p->one->rename_used, p->broken_pair);
4252 }
4253
4254 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4255 {
4256 int i;
4257 if (msg)
4258 fprintf(stderr, "%s\n", msg);
4259 fprintf(stderr, "q->nr = %d\n", q->nr);
4260 for (i = 0; i < q->nr; i++) {
4261 struct diff_filepair *p = q->queue[i];
4262 diff_debug_filepair(p, i);
4263 }
4264 }
4265 #endif
4266
4267 static void diff_resolve_rename_copy(void)
4268 {
4269 int i;
4270 struct diff_filepair *p;
4271 struct diff_queue_struct *q = &diff_queued_diff;
4272
4273 diff_debug_queue("resolve-rename-copy", q);
4274
4275 for (i = 0; i < q->nr; i++) {
4276 p = q->queue[i];
4277 p->status = 0; /* undecided */
4278 if (DIFF_PAIR_UNMERGED(p))
4279 p->status = DIFF_STATUS_UNMERGED;
4280 else if (!DIFF_FILE_VALID(p->one))
4281 p->status = DIFF_STATUS_ADDED;
4282 else if (!DIFF_FILE_VALID(p->two))
4283 p->status = DIFF_STATUS_DELETED;
4284 else if (DIFF_PAIR_TYPE_CHANGED(p))
4285 p->status = DIFF_STATUS_TYPE_CHANGED;
4286
4287 /* from this point on, we are dealing with a pair
4288 * whose both sides are valid and of the same type, i.e.
4289 * either in-place edit or rename/copy edit.
4290 */
4291 else if (DIFF_PAIR_RENAME(p)) {
4292 /*
4293 * A rename might have re-connected a broken
4294 * pair up, causing the pathnames to be the
4295 * same again. If so, that's not a rename at
4296 * all, just a modification..
4297 *
4298 * Otherwise, see if this source was used for
4299 * multiple renames, in which case we decrement
4300 * the count, and call it a copy.
4301 */
4302 if (!strcmp(p->one->path, p->two->path))
4303 p->status = DIFF_STATUS_MODIFIED;
4304 else if (--p->one->rename_used > 0)
4305 p->status = DIFF_STATUS_COPIED;
4306 else
4307 p->status = DIFF_STATUS_RENAMED;
4308 }
4309 else if (oidcmp(&p->one->oid, &p->two->oid) ||
4310 p->one->mode != p->two->mode ||
4311 p->one->dirty_submodule ||
4312 p->two->dirty_submodule ||
4313 is_null_oid(&p->one->oid))
4314 p->status = DIFF_STATUS_MODIFIED;
4315 else {
4316 /* This is a "no-change" entry and should not
4317 * happen anymore, but prepare for broken callers.
4318 */
4319 error("feeding unmodified %s to diffcore",
4320 p->one->path);
4321 p->status = DIFF_STATUS_UNKNOWN;
4322 }
4323 }
4324 diff_debug_queue("resolve-rename-copy done", q);
4325 }
4326
4327 static int check_pair_status(struct diff_filepair *p)
4328 {
4329 switch (p->status) {
4330 case DIFF_STATUS_UNKNOWN:
4331 return 0;
4332 case 0:
4333 die("internal error in diff-resolve-rename-copy");
4334 default:
4335 return 1;
4336 }
4337 }
4338
4339 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4340 {
4341 int fmt = opt->output_format;
4342
4343 if (fmt & DIFF_FORMAT_CHECKDIFF)
4344 diff_flush_checkdiff(p, opt);
4345 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4346 diff_flush_raw(p, opt);
4347 else if (fmt & DIFF_FORMAT_NAME) {
4348 const char *name_a, *name_b;
4349 name_a = p->two->path;
4350 name_b = NULL;
4351 strip_prefix(opt->prefix_length, &name_a, &name_b);
4352 write_name_quoted(name_a, opt->file, opt->line_termination);
4353 }
4354 }
4355
4356 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4357 {
4358 if (fs->mode)
4359 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4360 else
4361 fprintf(file, " %s ", newdelete);
4362 write_name_quoted(fs->path, file, '\n');
4363 }
4364
4365
4366 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4367 const char *line_prefix)
4368 {
4369 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4370 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4371 p->two->mode, show_name ? ' ' : '\n');
4372 if (show_name) {
4373 write_name_quoted(p->two->path, file, '\n');
4374 }
4375 }
4376 }
4377
4378 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4379 const char *line_prefix)
4380 {
4381 char *names = pprint_rename(p->one->path, p->two->path);
4382
4383 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4384 free(names);
4385 show_mode_change(file, p, 0, line_prefix);
4386 }
4387
4388 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4389 {
4390 FILE *file = opt->file;
4391 const char *line_prefix = diff_line_prefix(opt);
4392
4393 switch(p->status) {
4394 case DIFF_STATUS_DELETED:
4395 fputs(line_prefix, file);
4396 show_file_mode_name(file, "delete", p->one);
4397 break;
4398 case DIFF_STATUS_ADDED:
4399 fputs(line_prefix, file);
4400 show_file_mode_name(file, "create", p->two);
4401 break;
4402 case DIFF_STATUS_COPIED:
4403 fputs(line_prefix, file);
4404 show_rename_copy(file, "copy", p, line_prefix);
4405 break;
4406 case DIFF_STATUS_RENAMED:
4407 fputs(line_prefix, file);
4408 show_rename_copy(file, "rename", p, line_prefix);
4409 break;
4410 default:
4411 if (p->score) {
4412 fprintf(file, "%s rewrite ", line_prefix);
4413 write_name_quoted(p->two->path, file, ' ');
4414 fprintf(file, "(%d%%)\n", similarity_index(p));
4415 }
4416 show_mode_change(file, p, !p->score, line_prefix);
4417 break;
4418 }
4419 }
4420
4421 struct patch_id_t {
4422 git_SHA_CTX *ctx;
4423 int patchlen;
4424 };
4425
4426 static int remove_space(char *line, int len)
4427 {
4428 int i;
4429 char *dst = line;
4430 unsigned char c;
4431
4432 for (i = 0; i < len; i++)
4433 if (!isspace((c = line[i])))
4434 *dst++ = c;
4435
4436 return dst - line;
4437 }
4438
4439 static void patch_id_consume(void *priv, char *line, unsigned long len)
4440 {
4441 struct patch_id_t *data = priv;
4442 int new_len;
4443
4444 /* Ignore line numbers when computing the SHA1 of the patch */
4445 if (starts_with(line, "@@ -"))
4446 return;
4447
4448 new_len = remove_space(line, len);
4449
4450 git_SHA1_Update(data->ctx, line, new_len);
4451 data->patchlen += new_len;
4452 }
4453
4454 /* returns 0 upon success, and writes result into sha1 */
4455 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4456 {
4457 struct diff_queue_struct *q = &diff_queued_diff;
4458 int i;
4459 git_SHA_CTX ctx;
4460 struct patch_id_t data;
4461 char buffer[PATH_MAX * 4 + 20];
4462
4463 git_SHA1_Init(&ctx);
4464 memset(&data, 0, sizeof(struct patch_id_t));
4465 data.ctx = &ctx;
4466
4467 for (i = 0; i < q->nr; i++) {
4468 xpparam_t xpp;
4469 xdemitconf_t xecfg;
4470 mmfile_t mf1, mf2;
4471 struct diff_filepair *p = q->queue[i];
4472 int len1, len2;
4473
4474 memset(&xpp, 0, sizeof(xpp));
4475 memset(&xecfg, 0, sizeof(xecfg));
4476 if (p->status == 0)
4477 return error("internal diff status error");
4478 if (p->status == DIFF_STATUS_UNKNOWN)
4479 continue;
4480 if (diff_unmodified_pair(p))
4481 continue;
4482 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4483 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4484 continue;
4485 if (DIFF_PAIR_UNMERGED(p))
4486 continue;
4487
4488 diff_fill_sha1_info(p->one);
4489 diff_fill_sha1_info(p->two);
4490
4491 len1 = remove_space(p->one->path, strlen(p->one->path));
4492 len2 = remove_space(p->two->path, strlen(p->two->path));
4493 if (p->one->mode == 0)
4494 len1 = snprintf(buffer, sizeof(buffer),
4495 "diff--gita/%.*sb/%.*s"
4496 "newfilemode%06o"
4497 "---/dev/null"
4498 "+++b/%.*s",
4499 len1, p->one->path,
4500 len2, p->two->path,
4501 p->two->mode,
4502 len2, p->two->path);
4503 else if (p->two->mode == 0)
4504 len1 = snprintf(buffer, sizeof(buffer),
4505 "diff--gita/%.*sb/%.*s"
4506 "deletedfilemode%06o"
4507 "---a/%.*s"
4508 "+++/dev/null",
4509 len1, p->one->path,
4510 len2, p->two->path,
4511 p->one->mode,
4512 len1, p->one->path);
4513 else
4514 len1 = snprintf(buffer, sizeof(buffer),
4515 "diff--gita/%.*sb/%.*s"
4516 "---a/%.*s"
4517 "+++b/%.*s",
4518 len1, p->one->path,
4519 len2, p->two->path,
4520 len1, p->one->path,
4521 len2, p->two->path);
4522 git_SHA1_Update(&ctx, buffer, len1);
4523
4524 if (diff_header_only)
4525 continue;
4526
4527 if (fill_mmfile(&mf1, p->one) < 0 ||
4528 fill_mmfile(&mf2, p->two) < 0)
4529 return error("unable to read files to diff");
4530
4531 if (diff_filespec_is_binary(p->one) ||
4532 diff_filespec_is_binary(p->two)) {
4533 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
4534 40);
4535 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
4536 40);
4537 continue;
4538 }
4539
4540 xpp.flags = 0;
4541 xecfg.ctxlen = 3;
4542 xecfg.flags = 0;
4543 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4544 &xpp, &xecfg))
4545 return error("unable to generate patch-id diff for %s",
4546 p->one->path);
4547 }
4548
4549 git_SHA1_Final(sha1, &ctx);
4550 return 0;
4551 }
4552
4553 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4554 {
4555 struct diff_queue_struct *q = &diff_queued_diff;
4556 int i;
4557 int result = diff_get_patch_id(options, sha1, diff_header_only);
4558
4559 for (i = 0; i < q->nr; i++)
4560 diff_free_filepair(q->queue[i]);
4561
4562 free(q->queue);
4563 DIFF_QUEUE_CLEAR(q);
4564
4565 return result;
4566 }
4567
4568 static int is_summary_empty(const struct diff_queue_struct *q)
4569 {
4570 int i;
4571
4572 for (i = 0; i < q->nr; i++) {
4573 const struct diff_filepair *p = q->queue[i];
4574
4575 switch (p->status) {
4576 case DIFF_STATUS_DELETED:
4577 case DIFF_STATUS_ADDED:
4578 case DIFF_STATUS_COPIED:
4579 case DIFF_STATUS_RENAMED:
4580 return 0;
4581 default:
4582 if (p->score)
4583 return 0;
4584 if (p->one->mode && p->two->mode &&
4585 p->one->mode != p->two->mode)
4586 return 0;
4587 break;
4588 }
4589 }
4590 return 1;
4591 }
4592
4593 static const char rename_limit_warning[] =
4594 "inexact rename detection was skipped due to too many files.";
4595
4596 static const char degrade_cc_to_c_warning[] =
4597 "only found copies from modified paths due to too many files.";
4598
4599 static const char rename_limit_advice[] =
4600 "you may want to set your %s variable to at least "
4601 "%d and retry the command.";
4602
4603 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4604 {
4605 if (degraded_cc)
4606 warning(degrade_cc_to_c_warning);
4607 else if (needed)
4608 warning(rename_limit_warning);
4609 else
4610 return;
4611 if (0 < needed && needed < 32767)
4612 warning(rename_limit_advice, varname, needed);
4613 }
4614
4615 void diff_flush(struct diff_options *options)
4616 {
4617 struct diff_queue_struct *q = &diff_queued_diff;
4618 int i, output_format = options->output_format;
4619 int separator = 0;
4620 int dirstat_by_line = 0;
4621
4622 /*
4623 * Order: raw, stat, summary, patch
4624 * or: name/name-status/checkdiff (other bits clear)
4625 */
4626 if (!q->nr)
4627 goto free_queue;
4628
4629 if (output_format & (DIFF_FORMAT_RAW |
4630 DIFF_FORMAT_NAME |
4631 DIFF_FORMAT_NAME_STATUS |
4632 DIFF_FORMAT_CHECKDIFF)) {
4633 for (i = 0; i < q->nr; i++) {
4634 struct diff_filepair *p = q->queue[i];
4635 if (check_pair_status(p))
4636 flush_one_pair(p, options);
4637 }
4638 separator++;
4639 }
4640
4641 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4642 dirstat_by_line = 1;
4643
4644 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4645 dirstat_by_line) {
4646 struct diffstat_t diffstat;
4647
4648 memset(&diffstat, 0, sizeof(struct diffstat_t));
4649 for (i = 0; i < q->nr; i++) {
4650 struct diff_filepair *p = q->queue[i];
4651 if (check_pair_status(p))
4652 diff_flush_stat(p, options, &diffstat);
4653 }
4654 if (output_format & DIFF_FORMAT_NUMSTAT)
4655 show_numstat(&diffstat, options);
4656 if (output_format & DIFF_FORMAT_DIFFSTAT)
4657 show_stats(&diffstat, options);
4658 if (output_format & DIFF_FORMAT_SHORTSTAT)
4659 show_shortstats(&diffstat, options);
4660 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4661 show_dirstat_by_line(&diffstat, options);
4662 free_diffstat_info(&diffstat);
4663 separator++;
4664 }
4665 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4666 show_dirstat(options);
4667
4668 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4669 for (i = 0; i < q->nr; i++) {
4670 diff_summary(options, q->queue[i]);
4671 }
4672 separator++;
4673 }
4674
4675 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4676 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4677 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4678 /*
4679 * run diff_flush_patch for the exit status. setting
4680 * options->file to /dev/null should be safe, because we
4681 * aren't supposed to produce any output anyway.
4682 */
4683 if (options->close_file)
4684 fclose(options->file);
4685 options->file = fopen("/dev/null", "w");
4686 if (!options->file)
4687 die_errno("Could not open /dev/null");
4688 options->close_file = 1;
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 if (options->found_changes)
4694 break;
4695 }
4696 }
4697
4698 if (output_format & DIFF_FORMAT_PATCH) {
4699 if (separator) {
4700 fprintf(options->file, "%s%c",
4701 diff_line_prefix(options),
4702 options->line_termination);
4703 if (options->stat_sep) {
4704 /* attach patch instead of inline */
4705 fputs(options->stat_sep, options->file);
4706 }
4707 }
4708
4709 for (i = 0; i < q->nr; i++) {
4710 struct diff_filepair *p = q->queue[i];
4711 if (check_pair_status(p))
4712 diff_flush_patch(p, options);
4713 }
4714 }
4715
4716 if (output_format & DIFF_FORMAT_CALLBACK)
4717 options->format_callback(q, options, options->format_callback_data);
4718
4719 for (i = 0; i < q->nr; i++)
4720 diff_free_filepair(q->queue[i]);
4721 free_queue:
4722 free(q->queue);
4723 DIFF_QUEUE_CLEAR(q);
4724 if (options->close_file)
4725 fclose(options->file);
4726
4727 /*
4728 * Report the content-level differences with HAS_CHANGES;
4729 * diff_addremove/diff_change does not set the bit when
4730 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4731 */
4732 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4733 if (options->found_changes)
4734 DIFF_OPT_SET(options, HAS_CHANGES);
4735 else
4736 DIFF_OPT_CLR(options, HAS_CHANGES);
4737 }
4738 }
4739
4740 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4741 {
4742 return (((p->status == DIFF_STATUS_MODIFIED) &&
4743 ((p->score &&
4744 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4745 (!p->score &&
4746 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4747 ((p->status != DIFF_STATUS_MODIFIED) &&
4748 filter_bit_tst(p->status, options)));
4749 }
4750
4751 static void diffcore_apply_filter(struct diff_options *options)
4752 {
4753 int i;
4754 struct diff_queue_struct *q = &diff_queued_diff;
4755 struct diff_queue_struct outq;
4756
4757 DIFF_QUEUE_CLEAR(&outq);
4758
4759 if (!options->filter)
4760 return;
4761
4762 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4763 int found;
4764 for (i = found = 0; !found && i < q->nr; i++) {
4765 if (match_filter(options, q->queue[i]))
4766 found++;
4767 }
4768 if (found)
4769 return;
4770
4771 /* otherwise we will clear the whole queue
4772 * by copying the empty outq at the end of this
4773 * function, but first clear the current entries
4774 * in the queue.
4775 */
4776 for (i = 0; i < q->nr; i++)
4777 diff_free_filepair(q->queue[i]);
4778 }
4779 else {
4780 /* Only the matching ones */
4781 for (i = 0; i < q->nr; i++) {
4782 struct diff_filepair *p = q->queue[i];
4783 if (match_filter(options, p))
4784 diff_q(&outq, p);
4785 else
4786 diff_free_filepair(p);
4787 }
4788 }
4789 free(q->queue);
4790 *q = outq;
4791 }
4792
4793 /* Check whether two filespecs with the same mode and size are identical */
4794 static int diff_filespec_is_identical(struct diff_filespec *one,
4795 struct diff_filespec *two)
4796 {
4797 if (S_ISGITLINK(one->mode))
4798 return 0;
4799 if (diff_populate_filespec(one, 0))
4800 return 0;
4801 if (diff_populate_filespec(two, 0))
4802 return 0;
4803 return !memcmp(one->data, two->data, one->size);
4804 }
4805
4806 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4807 {
4808 if (p->done_skip_stat_unmatch)
4809 return p->skip_stat_unmatch_result;
4810
4811 p->done_skip_stat_unmatch = 1;
4812 p->skip_stat_unmatch_result = 0;
4813 /*
4814 * 1. Entries that come from stat info dirtiness
4815 * always have both sides (iow, not create/delete),
4816 * one side of the object name is unknown, with
4817 * the same mode and size. Keep the ones that
4818 * do not match these criteria. They have real
4819 * differences.
4820 *
4821 * 2. At this point, the file is known to be modified,
4822 * with the same mode and size, and the object
4823 * name of one side is unknown. Need to inspect
4824 * the identical contents.
4825 */
4826 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4827 !DIFF_FILE_VALID(p->two) ||
4828 (p->one->oid_valid && p->two->oid_valid) ||
4829 (p->one->mode != p->two->mode) ||
4830 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4831 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4832 (p->one->size != p->two->size) ||
4833 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4834 p->skip_stat_unmatch_result = 1;
4835 return p->skip_stat_unmatch_result;
4836 }
4837
4838 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4839 {
4840 int i;
4841 struct diff_queue_struct *q = &diff_queued_diff;
4842 struct diff_queue_struct outq;
4843 DIFF_QUEUE_CLEAR(&outq);
4844
4845 for (i = 0; i < q->nr; i++) {
4846 struct diff_filepair *p = q->queue[i];
4847
4848 if (diff_filespec_check_stat_unmatch(p))
4849 diff_q(&outq, p);
4850 else {
4851 /*
4852 * The caller can subtract 1 from skip_stat_unmatch
4853 * to determine how many paths were dirty only
4854 * due to stat info mismatch.
4855 */
4856 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4857 diffopt->skip_stat_unmatch++;
4858 diff_free_filepair(p);
4859 }
4860 }
4861 free(q->queue);
4862 *q = outq;
4863 }
4864
4865 static int diffnamecmp(const void *a_, const void *b_)
4866 {
4867 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4868 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4869 const char *name_a, *name_b;
4870
4871 name_a = a->one ? a->one->path : a->two->path;
4872 name_b = b->one ? b->one->path : b->two->path;
4873 return strcmp(name_a, name_b);
4874 }
4875
4876 void diffcore_fix_diff_index(struct diff_options *options)
4877 {
4878 struct diff_queue_struct *q = &diff_queued_diff;
4879 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4880 }
4881
4882 void diffcore_std(struct diff_options *options)
4883 {
4884 /* NOTE please keep the following in sync with diff_tree_combined() */
4885 if (options->skip_stat_unmatch)
4886 diffcore_skip_stat_unmatch(options);
4887 if (!options->found_follow) {
4888 /* See try_to_follow_renames() in tree-diff.c */
4889 if (options->break_opt != -1)
4890 diffcore_break(options->break_opt);
4891 if (options->detect_rename)
4892 diffcore_rename(options);
4893 if (options->break_opt != -1)
4894 diffcore_merge_broken();
4895 }
4896 if (options->pickaxe)
4897 diffcore_pickaxe(options);
4898 if (options->orderfile)
4899 diffcore_order(options->orderfile);
4900 if (!options->found_follow)
4901 /* See try_to_follow_renames() in tree-diff.c */
4902 diff_resolve_rename_copy();
4903 diffcore_apply_filter(options);
4904
4905 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4906 DIFF_OPT_SET(options, HAS_CHANGES);
4907 else
4908 DIFF_OPT_CLR(options, HAS_CHANGES);
4909
4910 options->found_follow = 0;
4911 }
4912
4913 int diff_result_code(struct diff_options *opt, int status)
4914 {
4915 int result = 0;
4916
4917 diff_warn_rename_limit("diff.renameLimit",
4918 opt->needed_rename_limit,
4919 opt->degraded_cc_to_c);
4920 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4921 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4922 return status;
4923 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4924 DIFF_OPT_TST(opt, HAS_CHANGES))
4925 result |= 01;
4926 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4927 DIFF_OPT_TST(opt, CHECK_FAILED))
4928 result |= 02;
4929 return result;
4930 }
4931
4932 int diff_can_quit_early(struct diff_options *opt)
4933 {
4934 return (DIFF_OPT_TST(opt, QUICK) &&
4935 !opt->filter &&
4936 DIFF_OPT_TST(opt, HAS_CHANGES));
4937 }
4938
4939 /*
4940 * Shall changes to this submodule be ignored?
4941 *
4942 * Submodule changes can be configured to be ignored separately for each path,
4943 * but that configuration can be overridden from the command line.
4944 */
4945 static int is_submodule_ignored(const char *path, struct diff_options *options)
4946 {
4947 int ignored = 0;
4948 unsigned orig_flags = options->flags;
4949 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4950 set_diffopt_flags_from_submodule_config(options, path);
4951 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4952 ignored = 1;
4953 options->flags = orig_flags;
4954 return ignored;
4955 }
4956
4957 void diff_addremove(struct diff_options *options,
4958 int addremove, unsigned mode,
4959 const unsigned char *sha1,
4960 int sha1_valid,
4961 const char *concatpath, unsigned dirty_submodule)
4962 {
4963 struct diff_filespec *one, *two;
4964
4965 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4966 return;
4967
4968 /* This may look odd, but it is a preparation for
4969 * feeding "there are unchanged files which should
4970 * not produce diffs, but when you are doing copy
4971 * detection you would need them, so here they are"
4972 * entries to the diff-core. They will be prefixed
4973 * with something like '=' or '*' (I haven't decided
4974 * which but should not make any difference).
4975 * Feeding the same new and old to diff_change()
4976 * also has the same effect.
4977 * Before the final output happens, they are pruned after
4978 * merged into rename/copy pairs as appropriate.
4979 */
4980 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4981 addremove = (addremove == '+' ? '-' :
4982 addremove == '-' ? '+' : addremove);
4983
4984 if (options->prefix &&
4985 strncmp(concatpath, options->prefix, options->prefix_length))
4986 return;
4987
4988 one = alloc_filespec(concatpath);
4989 two = alloc_filespec(concatpath);
4990
4991 if (addremove != '+')
4992 fill_filespec(one, sha1, sha1_valid, mode);
4993 if (addremove != '-') {
4994 fill_filespec(two, sha1, sha1_valid, mode);
4995 two->dirty_submodule = dirty_submodule;
4996 }
4997
4998 diff_queue(&diff_queued_diff, one, two);
4999 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5000 DIFF_OPT_SET(options, HAS_CHANGES);
5001 }
5002
5003 void diff_change(struct diff_options *options,
5004 unsigned old_mode, unsigned new_mode,
5005 const unsigned char *old_sha1,
5006 const unsigned char *new_sha1,
5007 int old_sha1_valid, int new_sha1_valid,
5008 const char *concatpath,
5009 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5010 {
5011 struct diff_filespec *one, *two;
5012 struct diff_filepair *p;
5013
5014 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5015 is_submodule_ignored(concatpath, options))
5016 return;
5017
5018 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5019 unsigned tmp;
5020 const unsigned char *tmp_c;
5021 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
5022 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
5023 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
5024 new_sha1_valid = tmp;
5025 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
5026 new_dirty_submodule = tmp;
5027 }
5028
5029 if (options->prefix &&
5030 strncmp(concatpath, options->prefix, options->prefix_length))
5031 return;
5032
5033 one = alloc_filespec(concatpath);
5034 two = alloc_filespec(concatpath);
5035 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5036 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5037 one->dirty_submodule = old_dirty_submodule;
5038 two->dirty_submodule = new_dirty_submodule;
5039 p = diff_queue(&diff_queued_diff, one, two);
5040
5041 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5042 return;
5043
5044 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5045 !diff_filespec_check_stat_unmatch(p))
5046 return;
5047
5048 DIFF_OPT_SET(options, HAS_CHANGES);
5049 }
5050
5051 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5052 {
5053 struct diff_filepair *pair;
5054 struct diff_filespec *one, *two;
5055
5056 if (options->prefix &&
5057 strncmp(path, options->prefix, options->prefix_length))
5058 return NULL;
5059
5060 one = alloc_filespec(path);
5061 two = alloc_filespec(path);
5062 pair = diff_queue(&diff_queued_diff, one, two);
5063 pair->is_unmerged = 1;
5064 return pair;
5065 }
5066
5067 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5068 size_t *outsize)
5069 {
5070 struct diff_tempfile *temp;
5071 const char *argv[3];
5072 const char **arg = argv;
5073 struct child_process child = CHILD_PROCESS_INIT;
5074 struct strbuf buf = STRBUF_INIT;
5075 int err = 0;
5076
5077 temp = prepare_temp_file(spec->path, spec);
5078 *arg++ = pgm;
5079 *arg++ = temp->name;
5080 *arg = NULL;
5081
5082 child.use_shell = 1;
5083 child.argv = argv;
5084 child.out = -1;
5085 if (start_command(&child)) {
5086 remove_tempfile();
5087 return NULL;
5088 }
5089
5090 if (strbuf_read(&buf, child.out, 0) < 0)
5091 err = error("error reading from textconv command '%s'", pgm);
5092 close(child.out);
5093
5094 if (finish_command(&child) || err) {
5095 strbuf_release(&buf);
5096 remove_tempfile();
5097 return NULL;
5098 }
5099 remove_tempfile();
5100
5101 return strbuf_detach(&buf, outsize);
5102 }
5103
5104 size_t fill_textconv(struct userdiff_driver *driver,
5105 struct diff_filespec *df,
5106 char **outbuf)
5107 {
5108 size_t size;
5109
5110 if (!driver) {
5111 if (!DIFF_FILE_VALID(df)) {
5112 *outbuf = "";
5113 return 0;
5114 }
5115 if (diff_populate_filespec(df, 0))
5116 die("unable to read files to diff");
5117 *outbuf = df->data;
5118 return df->size;
5119 }
5120
5121 if (!driver->textconv)
5122 die("BUG: fill_textconv called with non-textconv driver");
5123
5124 if (driver->textconv_cache && df->oid_valid) {
5125 *outbuf = notes_cache_get(driver->textconv_cache,
5126 df->oid.hash,
5127 &size);
5128 if (*outbuf)
5129 return size;
5130 }
5131
5132 *outbuf = run_textconv(driver->textconv, df, &size);
5133 if (!*outbuf)
5134 die("unable to read files to diff");
5135
5136 if (driver->textconv_cache && df->oid_valid) {
5137 /* ignore errors, as we might be in a readonly repository */
5138 notes_cache_put(driver->textconv_cache, df->oid.hash, *outbuf,
5139 size);
5140 /*
5141 * we could save up changes and flush them all at the end,
5142 * but we would need an extra call after all diffing is done.
5143 * Since generating a cache entry is the slow path anyway,
5144 * this extra overhead probably isn't a big deal.
5145 */
5146 notes_cache_write(driver->textconv_cache);
5147 }
5148
5149 return size;
5150 }
5151
5152 void setup_diff_pager(struct diff_options *opt)
5153 {
5154 /*
5155 * If the user asked for our exit code, then either they want --quiet
5156 * or --exit-code. We should definitely not bother with a pager in the
5157 * former case, as we will generate no output. Since we still properly
5158 * report our exit code even when a pager is run, we _could_ run a
5159 * pager with --exit-code. But since we have not done so historically,
5160 * and because it is easy to find people oneline advising "git diff
5161 * --exit-code" in hooks and other scripts, we do not do so.
5162 */
5163 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5164 check_pager_config("diff") != 0)
5165 setup_pager();
5166 }
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