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submodule: avoid auto-discovery in prepare_submodule_repo_env()
[alt-git.git] / diff.c
blobabff2eec2b0604786b09ff0ac7fae24e1df6677f
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 int *found_changesp;
358 struct strbuf *header;
359 };
360
361 static int count_lines(const char *data, int size)
362 {
363 int count, ch, completely_empty = 1, nl_just_seen = 0;
364 count = 0;
365 while (0 < size--) {
366 ch = *data++;
367 if (ch == '\n') {
368 count++;
369 nl_just_seen = 1;
370 completely_empty = 0;
371 }
372 else {
373 nl_just_seen = 0;
374 completely_empty = 0;
375 }
376 }
377 if (completely_empty)
378 return 0;
379 if (!nl_just_seen)
380 count++; /* no trailing newline */
381 return count;
382 }
383
384 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
385 {
386 if (!DIFF_FILE_VALID(one)) {
387 mf->ptr = (char *)""; /* does not matter */
388 mf->size = 0;
389 return 0;
390 }
391 else if (diff_populate_filespec(one, 0))
392 return -1;
393
394 mf->ptr = one->data;
395 mf->size = one->size;
396 return 0;
397 }
398
399 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
400 static unsigned long diff_filespec_size(struct diff_filespec *one)
401 {
402 if (!DIFF_FILE_VALID(one))
403 return 0;
404 diff_populate_filespec(one, CHECK_SIZE_ONLY);
405 return one->size;
406 }
407
408 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
409 {
410 char *ptr = mf->ptr;
411 long size = mf->size;
412 int cnt = 0;
413
414 if (!size)
415 return cnt;
416 ptr += size - 1; /* pointing at the very end */
417 if (*ptr != '\n')
418 ; /* incomplete line */
419 else
420 ptr--; /* skip the last LF */
421 while (mf->ptr < ptr) {
422 char *prev_eol;
423 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
424 if (*prev_eol == '\n')
425 break;
426 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
427 break;
428 cnt++;
429 ptr = prev_eol - 1;
430 }
431 return cnt;
432 }
433
434 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
435 struct emit_callback *ecbdata)
436 {
437 int l1, l2, at;
438 unsigned ws_rule = ecbdata->ws_rule;
439 l1 = count_trailing_blank(mf1, ws_rule);
440 l2 = count_trailing_blank(mf2, ws_rule);
441 if (l2 <= l1) {
442 ecbdata->blank_at_eof_in_preimage = 0;
443 ecbdata->blank_at_eof_in_postimage = 0;
444 return;
445 }
446 at = count_lines(mf1->ptr, mf1->size);
447 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
448
449 at = count_lines(mf2->ptr, mf2->size);
450 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
451 }
452
453 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
454 int first, const char *line, int len)
455 {
456 int has_trailing_newline, has_trailing_carriage_return;
457 int nofirst;
458 FILE *file = o->file;
459
460 fputs(diff_line_prefix(o), file);
461
462 if (len == 0) {
463 has_trailing_newline = (first == '\n');
464 has_trailing_carriage_return = (!has_trailing_newline &&
465 (first == '\r'));
466 nofirst = has_trailing_newline || has_trailing_carriage_return;
467 } else {
468 has_trailing_newline = (len > 0 && line[len-1] == '\n');
469 if (has_trailing_newline)
470 len--;
471 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
472 if (has_trailing_carriage_return)
473 len--;
474 nofirst = 0;
475 }
476
477 if (len || !nofirst) {
478 fputs(set, file);
479 if (!nofirst)
480 fputc(first, file);
481 fwrite(line, len, 1, file);
482 fputs(reset, file);
483 }
484 if (has_trailing_carriage_return)
485 fputc('\r', file);
486 if (has_trailing_newline)
487 fputc('\n', file);
488 }
489
490 static void emit_line(struct diff_options *o, const char *set, const char *reset,
491 const char *line, int len)
492 {
493 emit_line_0(o, set, reset, line[0], line+1, len-1);
494 }
495
496 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
497 {
498 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
499 ecbdata->blank_at_eof_in_preimage &&
500 ecbdata->blank_at_eof_in_postimage &&
501 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
502 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
503 return 0;
504 return ws_blank_line(line, len, ecbdata->ws_rule);
505 }
506
507 static void emit_line_checked(const char *reset,
508 struct emit_callback *ecbdata,
509 const char *line, int len,
510 enum color_diff color,
511 unsigned ws_error_highlight,
512 char sign)
513 {
514 const char *set = diff_get_color(ecbdata->color_diff, color);
515 const char *ws = NULL;
516
517 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
518 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
519 if (!*ws)
520 ws = NULL;
521 }
522
523 if (!ws)
524 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
525 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
526 /* Blank line at EOF - paint '+' as well */
527 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
528 else {
529 /* Emit just the prefix, then the rest. */
530 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
531 ws_check_emit(line, len, ecbdata->ws_rule,
532 ecbdata->opt->file, set, reset, ws);
533 }
534 }
535
536 static void emit_add_line(const char *reset,
537 struct emit_callback *ecbdata,
538 const char *line, int len)
539 {
540 emit_line_checked(reset, ecbdata, line, len,
541 DIFF_FILE_NEW, WSEH_NEW, '+');
542 }
543
544 static void emit_del_line(const char *reset,
545 struct emit_callback *ecbdata,
546 const char *line, int len)
547 {
548 emit_line_checked(reset, ecbdata, line, len,
549 DIFF_FILE_OLD, WSEH_OLD, '-');
550 }
551
552 static void emit_context_line(const char *reset,
553 struct emit_callback *ecbdata,
554 const char *line, int len)
555 {
556 emit_line_checked(reset, ecbdata, line, len,
557 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
558 }
559
560 static void emit_hunk_header(struct emit_callback *ecbdata,
561 const char *line, int len)
562 {
563 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
564 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
565 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
566 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
567 static const char atat[2] = { '@', '@' };
568 const char *cp, *ep;
569 struct strbuf msgbuf = STRBUF_INIT;
570 int org_len = len;
571 int i = 1;
572
573 /*
574 * As a hunk header must begin with "@@ -<old>, +<new> @@",
575 * it always is at least 10 bytes long.
576 */
577 if (len < 10 ||
578 memcmp(line, atat, 2) ||
579 !(ep = memmem(line + 2, len - 2, atat, 2))) {
580 emit_line(ecbdata->opt, context, reset, line, len);
581 return;
582 }
583 ep += 2; /* skip over @@ */
584
585 /* The hunk header in fraginfo color */
586 strbuf_addstr(&msgbuf, frag);
587 strbuf_add(&msgbuf, line, ep - line);
588 strbuf_addstr(&msgbuf, reset);
589
590 /*
591 * trailing "\r\n"
592 */
593 for ( ; i < 3; i++)
594 if (line[len - i] == '\r' || line[len - i] == '\n')
595 len--;
596
597 /* blank before the func header */
598 for (cp = ep; ep - line < len; ep++)
599 if (*ep != ' ' && *ep != '\t')
600 break;
601 if (ep != cp) {
602 strbuf_addstr(&msgbuf, context);
603 strbuf_add(&msgbuf, cp, ep - cp);
604 strbuf_addstr(&msgbuf, reset);
605 }
606
607 if (ep < line + len) {
608 strbuf_addstr(&msgbuf, func);
609 strbuf_add(&msgbuf, ep, line + len - ep);
610 strbuf_addstr(&msgbuf, reset);
611 }
612
613 strbuf_add(&msgbuf, line + len, org_len - len);
614 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
615 strbuf_release(&msgbuf);
616 }
617
618 static struct diff_tempfile *claim_diff_tempfile(void) {
619 int i;
620 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
621 if (!diff_temp[i].name)
622 return diff_temp + i;
623 die("BUG: diff is failing to clean up its tempfiles");
624 }
625
626 static void remove_tempfile(void)
627 {
628 int i;
629 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
630 if (is_tempfile_active(&diff_temp[i].tempfile))
631 delete_tempfile(&diff_temp[i].tempfile);
632 diff_temp[i].name = NULL;
633 }
634 }
635
636 static void print_line_count(FILE *file, int count)
637 {
638 switch (count) {
639 case 0:
640 fprintf(file, "0,0");
641 break;
642 case 1:
643 fprintf(file, "1");
644 break;
645 default:
646 fprintf(file, "1,%d", count);
647 break;
648 }
649 }
650
651 static void emit_rewrite_lines(struct emit_callback *ecb,
652 int prefix, const char *data, int size)
653 {
654 const char *endp = NULL;
655 static const char *nneof = " No newline at end of file\n";
656 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
657
658 while (0 < size) {
659 int len;
660
661 endp = memchr(data, '\n', size);
662 len = endp ? (endp - data + 1) : size;
663 if (prefix != '+') {
664 ecb->lno_in_preimage++;
665 emit_del_line(reset, ecb, data, len);
666 } else {
667 ecb->lno_in_postimage++;
668 emit_add_line(reset, ecb, data, len);
669 }
670 size -= len;
671 data += len;
672 }
673 if (!endp) {
674 const char *context = diff_get_color(ecb->color_diff,
675 DIFF_CONTEXT);
676 putc('\n', ecb->opt->file);
677 emit_line_0(ecb->opt, context, reset, '\\',
678 nneof, strlen(nneof));
679 }
680 }
681
682 static void emit_rewrite_diff(const char *name_a,
683 const char *name_b,
684 struct diff_filespec *one,
685 struct diff_filespec *two,
686 struct userdiff_driver *textconv_one,
687 struct userdiff_driver *textconv_two,
688 struct diff_options *o)
689 {
690 int lc_a, lc_b;
691 const char *name_a_tab, *name_b_tab;
692 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
693 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
694 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
695 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
696 const char *a_prefix, *b_prefix;
697 char *data_one, *data_two;
698 size_t size_one, size_two;
699 struct emit_callback ecbdata;
700 const char *line_prefix = diff_line_prefix(o);
701
702 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
703 a_prefix = o->b_prefix;
704 b_prefix = o->a_prefix;
705 } else {
706 a_prefix = o->a_prefix;
707 b_prefix = o->b_prefix;
708 }
709
710 name_a += (*name_a == '/');
711 name_b += (*name_b == '/');
712 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
713 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
714
715 strbuf_reset(&a_name);
716 strbuf_reset(&b_name);
717 quote_two_c_style(&a_name, a_prefix, name_a, 0);
718 quote_two_c_style(&b_name, b_prefix, name_b, 0);
719
720 size_one = fill_textconv(textconv_one, one, &data_one);
721 size_two = fill_textconv(textconv_two, two, &data_two);
722
723 memset(&ecbdata, 0, sizeof(ecbdata));
724 ecbdata.color_diff = want_color(o->use_color);
725 ecbdata.found_changesp = &o->found_changes;
726 ecbdata.ws_rule = whitespace_rule(name_b);
727 ecbdata.opt = o;
728 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
729 mmfile_t mf1, mf2;
730 mf1.ptr = (char *)data_one;
731 mf2.ptr = (char *)data_two;
732 mf1.size = size_one;
733 mf2.size = size_two;
734 check_blank_at_eof(&mf1, &mf2, &ecbdata);
735 }
736 ecbdata.lno_in_preimage = 1;
737 ecbdata.lno_in_postimage = 1;
738
739 lc_a = count_lines(data_one, size_one);
740 lc_b = count_lines(data_two, size_two);
741 fprintf(o->file,
742 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
743 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
744 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
745 line_prefix, fraginfo);
746 if (!o->irreversible_delete)
747 print_line_count(o->file, lc_a);
748 else
749 fprintf(o->file, "?,?");
750 fprintf(o->file, " +");
751 print_line_count(o->file, lc_b);
752 fprintf(o->file, " @@%s\n", reset);
753 if (lc_a && !o->irreversible_delete)
754 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
755 if (lc_b)
756 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
757 if (textconv_one)
758 free((char *)data_one);
759 if (textconv_two)
760 free((char *)data_two);
761 }
762
763 struct diff_words_buffer {
764 mmfile_t text;
765 long alloc;
766 struct diff_words_orig {
767 const char *begin, *end;
768 } *orig;
769 int orig_nr, orig_alloc;
770 };
771
772 static void diff_words_append(char *line, unsigned long len,
773 struct diff_words_buffer *buffer)
774 {
775 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
776 line++;
777 len--;
778 memcpy(buffer->text.ptr + buffer->text.size, line, len);
779 buffer->text.size += len;
780 buffer->text.ptr[buffer->text.size] = '\0';
781 }
782
783 struct diff_words_style_elem {
784 const char *prefix;
785 const char *suffix;
786 const char *color; /* NULL; filled in by the setup code if
787 * color is enabled */
788 };
789
790 struct diff_words_style {
791 enum diff_words_type type;
792 struct diff_words_style_elem new, old, ctx;
793 const char *newline;
794 };
795
796 static struct diff_words_style diff_words_styles[] = {
797 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
798 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
799 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
800 };
801
802 struct diff_words_data {
803 struct diff_words_buffer minus, plus;
804 const char *current_plus;
805 int last_minus;
806 struct diff_options *opt;
807 regex_t *word_regex;
808 enum diff_words_type type;
809 struct diff_words_style *style;
810 };
811
812 static int fn_out_diff_words_write_helper(FILE *fp,
813 struct diff_words_style_elem *st_el,
814 const char *newline,
815 size_t count, const char *buf,
816 const char *line_prefix)
817 {
818 int print = 0;
819
820 while (count) {
821 char *p = memchr(buf, '\n', count);
822 if (print)
823 fputs(line_prefix, fp);
824 if (p != buf) {
825 if (st_el->color && fputs(st_el->color, fp) < 0)
826 return -1;
827 if (fputs(st_el->prefix, fp) < 0 ||
828 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
829 fputs(st_el->suffix, fp) < 0)
830 return -1;
831 if (st_el->color && *st_el->color
832 && fputs(GIT_COLOR_RESET, fp) < 0)
833 return -1;
834 }
835 if (!p)
836 return 0;
837 if (fputs(newline, fp) < 0)
838 return -1;
839 count -= p + 1 - buf;
840 buf = p + 1;
841 print = 1;
842 }
843 return 0;
844 }
845
846 /*
847 * '--color-words' algorithm can be described as:
848 *
849 * 1. collect a the minus/plus lines of a diff hunk, divided into
850 * minus-lines and plus-lines;
851 *
852 * 2. break both minus-lines and plus-lines into words and
853 * place them into two mmfile_t with one word for each line;
854 *
855 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
856 *
857 * And for the common parts of the both file, we output the plus side text.
858 * diff_words->current_plus is used to trace the current position of the plus file
859 * which printed. diff_words->last_minus is used to trace the last minus word
860 * printed.
861 *
862 * For '--graph' to work with '--color-words', we need to output the graph prefix
863 * on each line of color words output. Generally, there are two conditions on
864 * which we should output the prefix.
865 *
866 * 1. diff_words->last_minus == 0 &&
867 * diff_words->current_plus == diff_words->plus.text.ptr
868 *
869 * that is: the plus text must start as a new line, and if there is no minus
870 * word printed, a graph prefix must be printed.
871 *
872 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
873 * *(diff_words->current_plus - 1) == '\n'
874 *
875 * that is: a graph prefix must be printed following a '\n'
876 */
877 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
878 {
879 if ((diff_words->last_minus == 0 &&
880 diff_words->current_plus == diff_words->plus.text.ptr) ||
881 (diff_words->current_plus > diff_words->plus.text.ptr &&
882 *(diff_words->current_plus - 1) == '\n')) {
883 return 1;
884 } else {
885 return 0;
886 }
887 }
888
889 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
890 {
891 struct diff_words_data *diff_words = priv;
892 struct diff_words_style *style = diff_words->style;
893 int minus_first, minus_len, plus_first, plus_len;
894 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
895 struct diff_options *opt = diff_words->opt;
896 const char *line_prefix;
897
898 if (line[0] != '@' || parse_hunk_header(line, len,
899 &minus_first, &minus_len, &plus_first, &plus_len))
900 return;
901
902 assert(opt);
903 line_prefix = diff_line_prefix(opt);
904
905 /* POSIX requires that first be decremented by one if len == 0... */
906 if (minus_len) {
907 minus_begin = diff_words->minus.orig[minus_first].begin;
908 minus_end =
909 diff_words->minus.orig[minus_first + minus_len - 1].end;
910 } else
911 minus_begin = minus_end =
912 diff_words->minus.orig[minus_first].end;
913
914 if (plus_len) {
915 plus_begin = diff_words->plus.orig[plus_first].begin;
916 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
917 } else
918 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
919
920 if (color_words_output_graph_prefix(diff_words)) {
921 fputs(line_prefix, diff_words->opt->file);
922 }
923 if (diff_words->current_plus != plus_begin) {
924 fn_out_diff_words_write_helper(diff_words->opt->file,
925 &style->ctx, style->newline,
926 plus_begin - diff_words->current_plus,
927 diff_words->current_plus, line_prefix);
928 if (*(plus_begin - 1) == '\n')
929 fputs(line_prefix, diff_words->opt->file);
930 }
931 if (minus_begin != minus_end) {
932 fn_out_diff_words_write_helper(diff_words->opt->file,
933 &style->old, style->newline,
934 minus_end - minus_begin, minus_begin,
935 line_prefix);
936 }
937 if (plus_begin != plus_end) {
938 fn_out_diff_words_write_helper(diff_words->opt->file,
939 &style->new, style->newline,
940 plus_end - plus_begin, plus_begin,
941 line_prefix);
942 }
943
944 diff_words->current_plus = plus_end;
945 diff_words->last_minus = minus_first;
946 }
947
948 /* This function starts looking at *begin, and returns 0 iff a word was found. */
949 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
950 int *begin, int *end)
951 {
952 if (word_regex && *begin < buffer->size) {
953 regmatch_t match[1];
954 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
955 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
956 '\n', match[0].rm_eo - match[0].rm_so);
957 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
958 *begin += match[0].rm_so;
959 return *begin >= *end;
960 }
961 return -1;
962 }
963
964 /* find the next word */
965 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
966 (*begin)++;
967 if (*begin >= buffer->size)
968 return -1;
969
970 /* find the end of the word */
971 *end = *begin + 1;
972 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
973 (*end)++;
974
975 return 0;
976 }
977
978 /*
979 * This function splits the words in buffer->text, stores the list with
980 * newline separator into out, and saves the offsets of the original words
981 * in buffer->orig.
982 */
983 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
984 regex_t *word_regex)
985 {
986 int i, j;
987 long alloc = 0;
988
989 out->size = 0;
990 out->ptr = NULL;
991
992 /* fake an empty "0th" word */
993 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
994 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
995 buffer->orig_nr = 1;
996
997 for (i = 0; i < buffer->text.size; i++) {
998 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
999 return;
1000
1001 /* store original boundaries */
1002 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1003 buffer->orig_alloc);
1004 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1005 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1006 buffer->orig_nr++;
1007
1008 /* store one word */
1009 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1010 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1011 out->ptr[out->size + j - i] = '\n';
1012 out->size += j - i + 1;
1013
1014 i = j - 1;
1015 }
1016 }
1017
1018 /* this executes the word diff on the accumulated buffers */
1019 static void diff_words_show(struct diff_words_data *diff_words)
1020 {
1021 xpparam_t xpp;
1022 xdemitconf_t xecfg;
1023 mmfile_t minus, plus;
1024 struct diff_words_style *style = diff_words->style;
1025
1026 struct diff_options *opt = diff_words->opt;
1027 const char *line_prefix;
1028
1029 assert(opt);
1030 line_prefix = diff_line_prefix(opt);
1031
1032 /* special case: only removal */
1033 if (!diff_words->plus.text.size) {
1034 fputs(line_prefix, diff_words->opt->file);
1035 fn_out_diff_words_write_helper(diff_words->opt->file,
1036 &style->old, style->newline,
1037 diff_words->minus.text.size,
1038 diff_words->minus.text.ptr, line_prefix);
1039 diff_words->minus.text.size = 0;
1040 return;
1041 }
1042
1043 diff_words->current_plus = diff_words->plus.text.ptr;
1044 diff_words->last_minus = 0;
1045
1046 memset(&xpp, 0, sizeof(xpp));
1047 memset(&xecfg, 0, sizeof(xecfg));
1048 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1049 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1050 xpp.flags = 0;
1051 /* as only the hunk header will be parsed, we need a 0-context */
1052 xecfg.ctxlen = 0;
1053 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1054 &xpp, &xecfg))
1055 die("unable to generate word diff");
1056 free(minus.ptr);
1057 free(plus.ptr);
1058 if (diff_words->current_plus != diff_words->plus.text.ptr +
1059 diff_words->plus.text.size) {
1060 if (color_words_output_graph_prefix(diff_words))
1061 fputs(line_prefix, diff_words->opt->file);
1062 fn_out_diff_words_write_helper(diff_words->opt->file,
1063 &style->ctx, style->newline,
1064 diff_words->plus.text.ptr + diff_words->plus.text.size
1065 - diff_words->current_plus, diff_words->current_plus,
1066 line_prefix);
1067 }
1068 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1069 }
1070
1071 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1072 static void diff_words_flush(struct emit_callback *ecbdata)
1073 {
1074 if (ecbdata->diff_words->minus.text.size ||
1075 ecbdata->diff_words->plus.text.size)
1076 diff_words_show(ecbdata->diff_words);
1077 }
1078
1079 static void diff_filespec_load_driver(struct diff_filespec *one)
1080 {
1081 /* Use already-loaded driver */
1082 if (one->driver)
1083 return;
1084
1085 if (S_ISREG(one->mode))
1086 one->driver = userdiff_find_by_path(one->path);
1087
1088 /* Fallback to default settings */
1089 if (!one->driver)
1090 one->driver = userdiff_find_by_name("default");
1091 }
1092
1093 static const char *userdiff_word_regex(struct diff_filespec *one)
1094 {
1095 diff_filespec_load_driver(one);
1096 return one->driver->word_regex;
1097 }
1098
1099 static void init_diff_words_data(struct emit_callback *ecbdata,
1100 struct diff_options *orig_opts,
1101 struct diff_filespec *one,
1102 struct diff_filespec *two)
1103 {
1104 int i;
1105 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1106 memcpy(o, orig_opts, sizeof(struct diff_options));
1107
1108 ecbdata->diff_words =
1109 xcalloc(1, sizeof(struct diff_words_data));
1110 ecbdata->diff_words->type = o->word_diff;
1111 ecbdata->diff_words->opt = o;
1112 if (!o->word_regex)
1113 o->word_regex = userdiff_word_regex(one);
1114 if (!o->word_regex)
1115 o->word_regex = userdiff_word_regex(two);
1116 if (!o->word_regex)
1117 o->word_regex = diff_word_regex_cfg;
1118 if (o->word_regex) {
1119 ecbdata->diff_words->word_regex = (regex_t *)
1120 xmalloc(sizeof(regex_t));
1121 if (regcomp(ecbdata->diff_words->word_regex,
1122 o->word_regex,
1123 REG_EXTENDED | REG_NEWLINE))
1124 die ("Invalid regular expression: %s",
1125 o->word_regex);
1126 }
1127 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1128 if (o->word_diff == diff_words_styles[i].type) {
1129 ecbdata->diff_words->style =
1130 &diff_words_styles[i];
1131 break;
1132 }
1133 }
1134 if (want_color(o->use_color)) {
1135 struct diff_words_style *st = ecbdata->diff_words->style;
1136 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1137 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1138 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1139 }
1140 }
1141
1142 static void free_diff_words_data(struct emit_callback *ecbdata)
1143 {
1144 if (ecbdata->diff_words) {
1145 diff_words_flush(ecbdata);
1146 free (ecbdata->diff_words->opt);
1147 free (ecbdata->diff_words->minus.text.ptr);
1148 free (ecbdata->diff_words->minus.orig);
1149 free (ecbdata->diff_words->plus.text.ptr);
1150 free (ecbdata->diff_words->plus.orig);
1151 if (ecbdata->diff_words->word_regex) {
1152 regfree(ecbdata->diff_words->word_regex);
1153 free(ecbdata->diff_words->word_regex);
1154 }
1155 free(ecbdata->diff_words);
1156 ecbdata->diff_words = NULL;
1157 }
1158 }
1159
1160 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1161 {
1162 if (want_color(diff_use_color))
1163 return diff_colors[ix];
1164 return "";
1165 }
1166
1167 const char *diff_line_prefix(struct diff_options *opt)
1168 {
1169 struct strbuf *msgbuf;
1170 if (!opt->output_prefix)
1171 return "";
1172
1173 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1174 return msgbuf->buf;
1175 }
1176
1177 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1178 {
1179 const char *cp;
1180 unsigned long allot;
1181 size_t l = len;
1182
1183 if (ecb->truncate)
1184 return ecb->truncate(line, len);
1185 cp = line;
1186 allot = l;
1187 while (0 < l) {
1188 (void) utf8_width(&cp, &l);
1189 if (!cp)
1190 break; /* truncated in the middle? */
1191 }
1192 return allot - l;
1193 }
1194
1195 static void find_lno(const char *line, struct emit_callback *ecbdata)
1196 {
1197 const char *p;
1198 ecbdata->lno_in_preimage = 0;
1199 ecbdata->lno_in_postimage = 0;
1200 p = strchr(line, '-');
1201 if (!p)
1202 return; /* cannot happen */
1203 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1204 p = strchr(p, '+');
1205 if (!p)
1206 return; /* cannot happen */
1207 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1208 }
1209
1210 static void fn_out_consume(void *priv, char *line, unsigned long len)
1211 {
1212 struct emit_callback *ecbdata = priv;
1213 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1214 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1215 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1216 struct diff_options *o = ecbdata->opt;
1217 const char *line_prefix = diff_line_prefix(o);
1218
1219 if (ecbdata->header) {
1220 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1221 strbuf_reset(ecbdata->header);
1222 ecbdata->header = NULL;
1223 }
1224 *(ecbdata->found_changesp) = 1;
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(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1233 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1234 fprintf(ecbdata->opt->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', ecbdata->opt->file);
1253 return;
1254 }
1255
1256 if (len < 1) {
1257 emit_line(ecbdata->opt, reset, reset, line, len);
1258 if (ecbdata->diff_words
1259 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1260 fputs("~\n", ecbdata->opt->file);
1261 return;
1262 }
1263
1264 if (ecbdata->diff_words) {
1265 if (line[0] == '-') {
1266 diff_words_append(line, len,
1267 &ecbdata->diff_words->minus);
1268 return;
1269 } else if (line[0] == '+') {
1270 diff_words_append(line, len,
1271 &ecbdata->diff_words->plus);
1272 return;
1273 } else if (starts_with(line, "\\ ")) {
1274 /*
1275 * Eat the "no newline at eof" marker as if we
1276 * saw a "+" or "-" line with nothing on it,
1277 * and return without diff_words_flush() to
1278 * defer processing. If this is the end of
1279 * preimage, more "+" lines may come after it.
1280 */
1281 return;
1282 }
1283 diff_words_flush(ecbdata);
1284 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1285 emit_line(ecbdata->opt, context, reset, line, len);
1286 fputs("~\n", ecbdata->opt->file);
1287 } else {
1288 /*
1289 * Skip the prefix character, if any. With
1290 * diff_suppress_blank_empty, there may be
1291 * none.
1292 */
1293 if (line[0] != '\n') {
1294 line++;
1295 len--;
1296 }
1297 emit_line(ecbdata->opt, context, reset, line, len);
1298 }
1299 return;
1300 }
1301
1302 switch (line[0]) {
1303 case '+':
1304 ecbdata->lno_in_postimage++;
1305 emit_add_line(reset, ecbdata, line + 1, len - 1);
1306 break;
1307 case '-':
1308 ecbdata->lno_in_preimage++;
1309 emit_del_line(reset, ecbdata, line + 1, len - 1);
1310 break;
1311 case ' ':
1312 ecbdata->lno_in_postimage++;
1313 ecbdata->lno_in_preimage++;
1314 emit_context_line(reset, ecbdata, line + 1, len - 1);
1315 break;
1316 default:
1317 /* incomplete line at the end */
1318 ecbdata->lno_in_preimage++;
1319 emit_line(ecbdata->opt,
1320 diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1321 reset, line, len);
1322 break;
1323 }
1324 }
1325
1326 static char *pprint_rename(const char *a, const char *b)
1327 {
1328 const char *old = a;
1329 const char *new = b;
1330 struct strbuf name = STRBUF_INIT;
1331 int pfx_length, sfx_length;
1332 int pfx_adjust_for_slash;
1333 int len_a = strlen(a);
1334 int len_b = strlen(b);
1335 int a_midlen, b_midlen;
1336 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1337 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1338
1339 if (qlen_a || qlen_b) {
1340 quote_c_style(a, &name, NULL, 0);
1341 strbuf_addstr(&name, " => ");
1342 quote_c_style(b, &name, NULL, 0);
1343 return strbuf_detach(&name, NULL);
1344 }
1345
1346 /* Find common prefix */
1347 pfx_length = 0;
1348 while (*old && *new && *old == *new) {
1349 if (*old == '/')
1350 pfx_length = old - a + 1;
1351 old++;
1352 new++;
1353 }
1354
1355 /* Find common suffix */
1356 old = a + len_a;
1357 new = b + len_b;
1358 sfx_length = 0;
1359 /*
1360 * If there is a common prefix, it must end in a slash. In
1361 * that case we let this loop run 1 into the prefix to see the
1362 * same slash.
1363 *
1364 * If there is no common prefix, we cannot do this as it would
1365 * underrun the input strings.
1366 */
1367 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1368 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1369 b + pfx_length - pfx_adjust_for_slash <= new &&
1370 *old == *new) {
1371 if (*old == '/')
1372 sfx_length = len_a - (old - a);
1373 old--;
1374 new--;
1375 }
1376
1377 /*
1378 * pfx{mid-a => mid-b}sfx
1379 * {pfx-a => pfx-b}sfx
1380 * pfx{sfx-a => sfx-b}
1381 * name-a => name-b
1382 */
1383 a_midlen = len_a - pfx_length - sfx_length;
1384 b_midlen = len_b - pfx_length - sfx_length;
1385 if (a_midlen < 0)
1386 a_midlen = 0;
1387 if (b_midlen < 0)
1388 b_midlen = 0;
1389
1390 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1391 if (pfx_length + sfx_length) {
1392 strbuf_add(&name, a, pfx_length);
1393 strbuf_addch(&name, '{');
1394 }
1395 strbuf_add(&name, a + pfx_length, a_midlen);
1396 strbuf_addstr(&name, " => ");
1397 strbuf_add(&name, b + pfx_length, b_midlen);
1398 if (pfx_length + sfx_length) {
1399 strbuf_addch(&name, '}');
1400 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1401 }
1402 return strbuf_detach(&name, NULL);
1403 }
1404
1405 struct diffstat_t {
1406 int nr;
1407 int alloc;
1408 struct diffstat_file {
1409 char *from_name;
1410 char *name;
1411 char *print_name;
1412 unsigned is_unmerged:1;
1413 unsigned is_binary:1;
1414 unsigned is_renamed:1;
1415 unsigned is_interesting:1;
1416 uintmax_t added, deleted;
1417 } **files;
1418 };
1419
1420 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1421 const char *name_a,
1422 const char *name_b)
1423 {
1424 struct diffstat_file *x;
1425 x = xcalloc(1, sizeof(*x));
1426 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1427 diffstat->files[diffstat->nr++] = x;
1428 if (name_b) {
1429 x->from_name = xstrdup(name_a);
1430 x->name = xstrdup(name_b);
1431 x->is_renamed = 1;
1432 }
1433 else {
1434 x->from_name = NULL;
1435 x->name = xstrdup(name_a);
1436 }
1437 return x;
1438 }
1439
1440 static void diffstat_consume(void *priv, char *line, unsigned long len)
1441 {
1442 struct diffstat_t *diffstat = priv;
1443 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1444
1445 if (line[0] == '+')
1446 x->added++;
1447 else if (line[0] == '-')
1448 x->deleted++;
1449 }
1450
1451 const char mime_boundary_leader[] = "------------";
1452
1453 static int scale_linear(int it, int width, int max_change)
1454 {
1455 if (!it)
1456 return 0;
1457 /*
1458 * make sure that at least one '-' or '+' is printed if
1459 * there is any change to this path. The easiest way is to
1460 * scale linearly as if the alloted width is one column shorter
1461 * than it is, and then add 1 to the result.
1462 */
1463 return 1 + (it * (width - 1) / max_change);
1464 }
1465
1466 static void show_name(FILE *file,
1467 const char *prefix, const char *name, int len)
1468 {
1469 fprintf(file, " %s%-*s |", prefix, len, name);
1470 }
1471
1472 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1473 {
1474 if (cnt <= 0)
1475 return;
1476 fprintf(file, "%s", set);
1477 while (cnt--)
1478 putc(ch, file);
1479 fprintf(file, "%s", reset);
1480 }
1481
1482 static void fill_print_name(struct diffstat_file *file)
1483 {
1484 char *pname;
1485
1486 if (file->print_name)
1487 return;
1488
1489 if (!file->is_renamed) {
1490 struct strbuf buf = STRBUF_INIT;
1491 if (quote_c_style(file->name, &buf, NULL, 0)) {
1492 pname = strbuf_detach(&buf, NULL);
1493 } else {
1494 pname = file->name;
1495 strbuf_release(&buf);
1496 }
1497 } else {
1498 pname = pprint_rename(file->from_name, file->name);
1499 }
1500 file->print_name = pname;
1501 }
1502
1503 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1504 {
1505 struct strbuf sb = STRBUF_INIT;
1506 int ret;
1507
1508 if (!files) {
1509 assert(insertions == 0 && deletions == 0);
1510 return fprintf(fp, "%s\n", " 0 files changed");
1511 }
1512
1513 strbuf_addf(&sb,
1514 (files == 1) ? " %d file changed" : " %d files changed",
1515 files);
1516
1517 /*
1518 * For binary diff, the caller may want to print "x files
1519 * changed" with insertions == 0 && deletions == 0.
1520 *
1521 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1522 * is probably less confusing (i.e skip over "2 files changed
1523 * but nothing about added/removed lines? Is this a bug in Git?").
1524 */
1525 if (insertions || deletions == 0) {
1526 strbuf_addf(&sb,
1527 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1528 insertions);
1529 }
1530
1531 if (deletions || insertions == 0) {
1532 strbuf_addf(&sb,
1533 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1534 deletions);
1535 }
1536 strbuf_addch(&sb, '\n');
1537 ret = fputs(sb.buf, fp);
1538 strbuf_release(&sb);
1539 return ret;
1540 }
1541
1542 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1543 {
1544 int i, len, add, del, adds = 0, dels = 0;
1545 uintmax_t max_change = 0, max_len = 0;
1546 int total_files = data->nr, count;
1547 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1548 const char *reset, *add_c, *del_c;
1549 const char *line_prefix = "";
1550 int extra_shown = 0;
1551
1552 if (data->nr == 0)
1553 return;
1554
1555 line_prefix = diff_line_prefix(options);
1556 count = options->stat_count ? options->stat_count : data->nr;
1557
1558 reset = diff_get_color_opt(options, DIFF_RESET);
1559 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1560 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1561
1562 /*
1563 * Find the longest filename and max number of changes
1564 */
1565 for (i = 0; (i < count) && (i < data->nr); i++) {
1566 struct diffstat_file *file = data->files[i];
1567 uintmax_t change = file->added + file->deleted;
1568
1569 if (!file->is_interesting && (change == 0)) {
1570 count++; /* not shown == room for one more */
1571 continue;
1572 }
1573 fill_print_name(file);
1574 len = strlen(file->print_name);
1575 if (max_len < len)
1576 max_len = len;
1577
1578 if (file->is_unmerged) {
1579 /* "Unmerged" is 8 characters */
1580 bin_width = bin_width < 8 ? 8 : bin_width;
1581 continue;
1582 }
1583 if (file->is_binary) {
1584 /* "Bin XXX -> YYY bytes" */
1585 int w = 14 + decimal_width(file->added)
1586 + decimal_width(file->deleted);
1587 bin_width = bin_width < w ? w : bin_width;
1588 /* Display change counts aligned with "Bin" */
1589 number_width = 3;
1590 continue;
1591 }
1592
1593 if (max_change < change)
1594 max_change = change;
1595 }
1596 count = i; /* where we can stop scanning in data->files[] */
1597
1598 /*
1599 * We have width = stat_width or term_columns() columns total.
1600 * We want a maximum of min(max_len, stat_name_width) for the name part.
1601 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1602 * We also need 1 for " " and 4 + decimal_width(max_change)
1603 * for " | NNNN " and one the empty column at the end, altogether
1604 * 6 + decimal_width(max_change).
1605 *
1606 * If there's not enough space, we will use the smaller of
1607 * stat_name_width (if set) and 5/8*width for the filename,
1608 * and the rest for constant elements + graph part, but no more
1609 * than stat_graph_width for the graph part.
1610 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1611 * for the standard terminal size).
1612 *
1613 * In other words: stat_width limits the maximum width, and
1614 * stat_name_width fixes the maximum width of the filename,
1615 * and is also used to divide available columns if there
1616 * aren't enough.
1617 *
1618 * Binary files are displayed with "Bin XXX -> YYY bytes"
1619 * instead of the change count and graph. This part is treated
1620 * similarly to the graph part, except that it is not
1621 * "scaled". If total width is too small to accommodate the
1622 * guaranteed minimum width of the filename part and the
1623 * separators and this message, this message will "overflow"
1624 * making the line longer than the maximum width.
1625 */
1626
1627 if (options->stat_width == -1)
1628 width = term_columns() - options->output_prefix_length;
1629 else
1630 width = options->stat_width ? options->stat_width : 80;
1631 number_width = decimal_width(max_change) > number_width ?
1632 decimal_width(max_change) : number_width;
1633
1634 if (options->stat_graph_width == -1)
1635 options->stat_graph_width = diff_stat_graph_width;
1636
1637 /*
1638 * Guarantee 3/8*16==6 for the graph part
1639 * and 5/8*16==10 for the filename part
1640 */
1641 if (width < 16 + 6 + number_width)
1642 width = 16 + 6 + number_width;
1643
1644 /*
1645 * First assign sizes that are wanted, ignoring available width.
1646 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1647 * starting from "XXX" should fit in graph_width.
1648 */
1649 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1650 if (options->stat_graph_width &&
1651 options->stat_graph_width < graph_width)
1652 graph_width = options->stat_graph_width;
1653
1654 name_width = (options->stat_name_width > 0 &&
1655 options->stat_name_width < max_len) ?
1656 options->stat_name_width : max_len;
1657
1658 /*
1659 * Adjust adjustable widths not to exceed maximum width
1660 */
1661 if (name_width + number_width + 6 + graph_width > width) {
1662 if (graph_width > width * 3/8 - number_width - 6) {
1663 graph_width = width * 3/8 - number_width - 6;
1664 if (graph_width < 6)
1665 graph_width = 6;
1666 }
1667
1668 if (options->stat_graph_width &&
1669 graph_width > options->stat_graph_width)
1670 graph_width = options->stat_graph_width;
1671 if (name_width > width - number_width - 6 - graph_width)
1672 name_width = width - number_width - 6 - graph_width;
1673 else
1674 graph_width = width - number_width - 6 - name_width;
1675 }
1676
1677 /*
1678 * From here name_width is the width of the name area,
1679 * and graph_width is the width of the graph area.
1680 * max_change is used to scale graph properly.
1681 */
1682 for (i = 0; i < count; i++) {
1683 const char *prefix = "";
1684 struct diffstat_file *file = data->files[i];
1685 char *name = file->print_name;
1686 uintmax_t added = file->added;
1687 uintmax_t deleted = file->deleted;
1688 int name_len;
1689
1690 if (!file->is_interesting && (added + deleted == 0))
1691 continue;
1692
1693 /*
1694 * "scale" the filename
1695 */
1696 len = name_width;
1697 name_len = strlen(name);
1698 if (name_width < name_len) {
1699 char *slash;
1700 prefix = "...";
1701 len -= 3;
1702 name += name_len - len;
1703 slash = strchr(name, '/');
1704 if (slash)
1705 name = slash;
1706 }
1707
1708 if (file->is_binary) {
1709 fprintf(options->file, "%s", line_prefix);
1710 show_name(options->file, prefix, name, len);
1711 fprintf(options->file, " %*s", number_width, "Bin");
1712 if (!added && !deleted) {
1713 putc('\n', options->file);
1714 continue;
1715 }
1716 fprintf(options->file, " %s%"PRIuMAX"%s",
1717 del_c, deleted, reset);
1718 fprintf(options->file, " -> ");
1719 fprintf(options->file, "%s%"PRIuMAX"%s",
1720 add_c, added, reset);
1721 fprintf(options->file, " bytes");
1722 fprintf(options->file, "\n");
1723 continue;
1724 }
1725 else if (file->is_unmerged) {
1726 fprintf(options->file, "%s", line_prefix);
1727 show_name(options->file, prefix, name, len);
1728 fprintf(options->file, " Unmerged\n");
1729 continue;
1730 }
1731
1732 /*
1733 * scale the add/delete
1734 */
1735 add = added;
1736 del = deleted;
1737
1738 if (graph_width <= max_change) {
1739 int total = scale_linear(add + del, graph_width, max_change);
1740 if (total < 2 && add && del)
1741 /* width >= 2 due to the sanity check */
1742 total = 2;
1743 if (add < del) {
1744 add = scale_linear(add, graph_width, max_change);
1745 del = total - add;
1746 } else {
1747 del = scale_linear(del, graph_width, max_change);
1748 add = total - del;
1749 }
1750 }
1751 fprintf(options->file, "%s", line_prefix);
1752 show_name(options->file, prefix, name, len);
1753 fprintf(options->file, " %*"PRIuMAX"%s",
1754 number_width, added + deleted,
1755 added + deleted ? " " : "");
1756 show_graph(options->file, '+', add, add_c, reset);
1757 show_graph(options->file, '-', del, del_c, reset);
1758 fprintf(options->file, "\n");
1759 }
1760
1761 for (i = 0; i < data->nr; i++) {
1762 struct diffstat_file *file = data->files[i];
1763 uintmax_t added = file->added;
1764 uintmax_t deleted = file->deleted;
1765
1766 if (file->is_unmerged ||
1767 (!file->is_interesting && (added + deleted == 0))) {
1768 total_files--;
1769 continue;
1770 }
1771
1772 if (!file->is_binary) {
1773 adds += added;
1774 dels += deleted;
1775 }
1776 if (i < count)
1777 continue;
1778 if (!extra_shown)
1779 fprintf(options->file, "%s ...\n", line_prefix);
1780 extra_shown = 1;
1781 }
1782 fprintf(options->file, "%s", line_prefix);
1783 print_stat_summary(options->file, total_files, adds, dels);
1784 }
1785
1786 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1787 {
1788 int i, adds = 0, dels = 0, total_files = data->nr;
1789
1790 if (data->nr == 0)
1791 return;
1792
1793 for (i = 0; i < data->nr; i++) {
1794 int added = data->files[i]->added;
1795 int deleted= data->files[i]->deleted;
1796
1797 if (data->files[i]->is_unmerged ||
1798 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1799 total_files--;
1800 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1801 adds += added;
1802 dels += deleted;
1803 }
1804 }
1805 fprintf(options->file, "%s", diff_line_prefix(options));
1806 print_stat_summary(options->file, total_files, adds, dels);
1807 }
1808
1809 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1810 {
1811 int i;
1812
1813 if (data->nr == 0)
1814 return;
1815
1816 for (i = 0; i < data->nr; i++) {
1817 struct diffstat_file *file = data->files[i];
1818
1819 fprintf(options->file, "%s", diff_line_prefix(options));
1820
1821 if (file->is_binary)
1822 fprintf(options->file, "-\t-\t");
1823 else
1824 fprintf(options->file,
1825 "%"PRIuMAX"\t%"PRIuMAX"\t",
1826 file->added, file->deleted);
1827 if (options->line_termination) {
1828 fill_print_name(file);
1829 if (!file->is_renamed)
1830 write_name_quoted(file->name, options->file,
1831 options->line_termination);
1832 else {
1833 fputs(file->print_name, options->file);
1834 putc(options->line_termination, options->file);
1835 }
1836 } else {
1837 if (file->is_renamed) {
1838 putc('\0', options->file);
1839 write_name_quoted(file->from_name, options->file, '\0');
1840 }
1841 write_name_quoted(file->name, options->file, '\0');
1842 }
1843 }
1844 }
1845
1846 struct dirstat_file {
1847 const char *name;
1848 unsigned long changed;
1849 };
1850
1851 struct dirstat_dir {
1852 struct dirstat_file *files;
1853 int alloc, nr, permille, cumulative;
1854 };
1855
1856 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1857 unsigned long changed, const char *base, int baselen)
1858 {
1859 unsigned long this_dir = 0;
1860 unsigned int sources = 0;
1861 const char *line_prefix = diff_line_prefix(opt);
1862
1863 while (dir->nr) {
1864 struct dirstat_file *f = dir->files;
1865 int namelen = strlen(f->name);
1866 unsigned long this;
1867 char *slash;
1868
1869 if (namelen < baselen)
1870 break;
1871 if (memcmp(f->name, base, baselen))
1872 break;
1873 slash = strchr(f->name + baselen, '/');
1874 if (slash) {
1875 int newbaselen = slash + 1 - f->name;
1876 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1877 sources++;
1878 } else {
1879 this = f->changed;
1880 dir->files++;
1881 dir->nr--;
1882 sources += 2;
1883 }
1884 this_dir += this;
1885 }
1886
1887 /*
1888 * We don't report dirstat's for
1889 * - the top level
1890 * - or cases where everything came from a single directory
1891 * under this directory (sources == 1).
1892 */
1893 if (baselen && sources != 1) {
1894 if (this_dir) {
1895 int permille = this_dir * 1000 / changed;
1896 if (permille >= dir->permille) {
1897 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1898 permille / 10, permille % 10, baselen, base);
1899 if (!dir->cumulative)
1900 return 0;
1901 }
1902 }
1903 }
1904 return this_dir;
1905 }
1906
1907 static int dirstat_compare(const void *_a, const void *_b)
1908 {
1909 const struct dirstat_file *a = _a;
1910 const struct dirstat_file *b = _b;
1911 return strcmp(a->name, b->name);
1912 }
1913
1914 static void show_dirstat(struct diff_options *options)
1915 {
1916 int i;
1917 unsigned long changed;
1918 struct dirstat_dir dir;
1919 struct diff_queue_struct *q = &diff_queued_diff;
1920
1921 dir.files = NULL;
1922 dir.alloc = 0;
1923 dir.nr = 0;
1924 dir.permille = options->dirstat_permille;
1925 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1926
1927 changed = 0;
1928 for (i = 0; i < q->nr; i++) {
1929 struct diff_filepair *p = q->queue[i];
1930 const char *name;
1931 unsigned long copied, added, damage;
1932 int content_changed;
1933
1934 name = p->two->path ? p->two->path : p->one->path;
1935
1936 if (p->one->sha1_valid && p->two->sha1_valid)
1937 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1938 else
1939 content_changed = 1;
1940
1941 if (!content_changed) {
1942 /*
1943 * The SHA1 has not changed, so pre-/post-content is
1944 * identical. We can therefore skip looking at the
1945 * file contents altogether.
1946 */
1947 damage = 0;
1948 goto found_damage;
1949 }
1950
1951 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1952 /*
1953 * In --dirstat-by-file mode, we don't really need to
1954 * look at the actual file contents at all.
1955 * The fact that the SHA1 changed is enough for us to
1956 * add this file to the list of results
1957 * (with each file contributing equal damage).
1958 */
1959 damage = 1;
1960 goto found_damage;
1961 }
1962
1963 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1964 diff_populate_filespec(p->one, 0);
1965 diff_populate_filespec(p->two, 0);
1966 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1967 &copied, &added);
1968 diff_free_filespec_data(p->one);
1969 diff_free_filespec_data(p->two);
1970 } else if (DIFF_FILE_VALID(p->one)) {
1971 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1972 copied = added = 0;
1973 diff_free_filespec_data(p->one);
1974 } else if (DIFF_FILE_VALID(p->two)) {
1975 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1976 copied = 0;
1977 added = p->two->size;
1978 diff_free_filespec_data(p->two);
1979 } else
1980 continue;
1981
1982 /*
1983 * Original minus copied is the removed material,
1984 * added is the new material. They are both damages
1985 * made to the preimage.
1986 * If the resulting damage is zero, we know that
1987 * diffcore_count_changes() considers the two entries to
1988 * be identical, but since content_changed is true, we
1989 * know that there must have been _some_ kind of change,
1990 * so we force all entries to have damage > 0.
1991 */
1992 damage = (p->one->size - copied) + added;
1993 if (!damage)
1994 damage = 1;
1995
1996 found_damage:
1997 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1998 dir.files[dir.nr].name = name;
1999 dir.files[dir.nr].changed = damage;
2000 changed += damage;
2001 dir.nr++;
2002 }
2003
2004 /* This can happen even with many files, if everything was renames */
2005 if (!changed)
2006 return;
2007
2008 /* Show all directories with more than x% of the changes */
2009 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2010 gather_dirstat(options, &dir, changed, "", 0);
2011 }
2012
2013 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2014 {
2015 int i;
2016 unsigned long changed;
2017 struct dirstat_dir dir;
2018
2019 if (data->nr == 0)
2020 return;
2021
2022 dir.files = NULL;
2023 dir.alloc = 0;
2024 dir.nr = 0;
2025 dir.permille = options->dirstat_permille;
2026 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2027
2028 changed = 0;
2029 for (i = 0; i < data->nr; i++) {
2030 struct diffstat_file *file = data->files[i];
2031 unsigned long damage = file->added + file->deleted;
2032 if (file->is_binary)
2033 /*
2034 * binary files counts bytes, not lines. Must find some
2035 * way to normalize binary bytes vs. textual lines.
2036 * The following heuristic assumes that there are 64
2037 * bytes per "line".
2038 * This is stupid and ugly, but very cheap...
2039 */
2040 damage = (damage + 63) / 64;
2041 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2042 dir.files[dir.nr].name = file->name;
2043 dir.files[dir.nr].changed = damage;
2044 changed += damage;
2045 dir.nr++;
2046 }
2047
2048 /* This can happen even with many files, if everything was renames */
2049 if (!changed)
2050 return;
2051
2052 /* Show all directories with more than x% of the changes */
2053 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2054 gather_dirstat(options, &dir, changed, "", 0);
2055 }
2056
2057 static void free_diffstat_info(struct diffstat_t *diffstat)
2058 {
2059 int i;
2060 for (i = 0; i < diffstat->nr; i++) {
2061 struct diffstat_file *f = diffstat->files[i];
2062 if (f->name != f->print_name)
2063 free(f->print_name);
2064 free(f->name);
2065 free(f->from_name);
2066 free(f);
2067 }
2068 free(diffstat->files);
2069 }
2070
2071 struct checkdiff_t {
2072 const char *filename;
2073 int lineno;
2074 int conflict_marker_size;
2075 struct diff_options *o;
2076 unsigned ws_rule;
2077 unsigned status;
2078 };
2079
2080 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2081 {
2082 char firstchar;
2083 int cnt;
2084
2085 if (len < marker_size + 1)
2086 return 0;
2087 firstchar = line[0];
2088 switch (firstchar) {
2089 case '=': case '>': case '<': case '|':
2090 break;
2091 default:
2092 return 0;
2093 }
2094 for (cnt = 1; cnt < marker_size; cnt++)
2095 if (line[cnt] != firstchar)
2096 return 0;
2097 /* line[1] thru line[marker_size-1] are same as firstchar */
2098 if (len < marker_size + 1 || !isspace(line[marker_size]))
2099 return 0;
2100 return 1;
2101 }
2102
2103 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2104 {
2105 struct checkdiff_t *data = priv;
2106 int marker_size = data->conflict_marker_size;
2107 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2108 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2109 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2110 char *err;
2111 const char *line_prefix;
2112
2113 assert(data->o);
2114 line_prefix = diff_line_prefix(data->o);
2115
2116 if (line[0] == '+') {
2117 unsigned bad;
2118 data->lineno++;
2119 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2120 data->status |= 1;
2121 fprintf(data->o->file,
2122 "%s%s:%d: leftover conflict marker\n",
2123 line_prefix, data->filename, data->lineno);
2124 }
2125 bad = ws_check(line + 1, len - 1, data->ws_rule);
2126 if (!bad)
2127 return;
2128 data->status |= bad;
2129 err = whitespace_error_string(bad);
2130 fprintf(data->o->file, "%s%s:%d: %s.\n",
2131 line_prefix, data->filename, data->lineno, err);
2132 free(err);
2133 emit_line(data->o, set, reset, line, 1);
2134 ws_check_emit(line + 1, len - 1, data->ws_rule,
2135 data->o->file, set, reset, ws);
2136 } else if (line[0] == ' ') {
2137 data->lineno++;
2138 } else if (line[0] == '@') {
2139 char *plus = strchr(line, '+');
2140 if (plus)
2141 data->lineno = strtol(plus, NULL, 10) - 1;
2142 else
2143 die("invalid diff");
2144 }
2145 }
2146
2147 static unsigned char *deflate_it(char *data,
2148 unsigned long size,
2149 unsigned long *result_size)
2150 {
2151 int bound;
2152 unsigned char *deflated;
2153 git_zstream stream;
2154
2155 git_deflate_init(&stream, zlib_compression_level);
2156 bound = git_deflate_bound(&stream, size);
2157 deflated = xmalloc(bound);
2158 stream.next_out = deflated;
2159 stream.avail_out = bound;
2160
2161 stream.next_in = (unsigned char *)data;
2162 stream.avail_in = size;
2163 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2164 ; /* nothing */
2165 git_deflate_end(&stream);
2166 *result_size = stream.total_out;
2167 return deflated;
2168 }
2169
2170 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2171 const char *prefix)
2172 {
2173 void *cp;
2174 void *delta;
2175 void *deflated;
2176 void *data;
2177 unsigned long orig_size;
2178 unsigned long delta_size;
2179 unsigned long deflate_size;
2180 unsigned long data_size;
2181
2182 /* We could do deflated delta, or we could do just deflated two,
2183 * whichever is smaller.
2184 */
2185 delta = NULL;
2186 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2187 if (one->size && two->size) {
2188 delta = diff_delta(one->ptr, one->size,
2189 two->ptr, two->size,
2190 &delta_size, deflate_size);
2191 if (delta) {
2192 void *to_free = delta;
2193 orig_size = delta_size;
2194 delta = deflate_it(delta, delta_size, &delta_size);
2195 free(to_free);
2196 }
2197 }
2198
2199 if (delta && delta_size < deflate_size) {
2200 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2201 free(deflated);
2202 data = delta;
2203 data_size = delta_size;
2204 }
2205 else {
2206 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2207 free(delta);
2208 data = deflated;
2209 data_size = deflate_size;
2210 }
2211
2212 /* emit data encoded in base85 */
2213 cp = data;
2214 while (data_size) {
2215 int bytes = (52 < data_size) ? 52 : data_size;
2216 char line[70];
2217 data_size -= bytes;
2218 if (bytes <= 26)
2219 line[0] = bytes + 'A' - 1;
2220 else
2221 line[0] = bytes - 26 + 'a' - 1;
2222 encode_85(line + 1, cp, bytes);
2223 cp = (char *) cp + bytes;
2224 fprintf(file, "%s", prefix);
2225 fputs(line, file);
2226 fputc('\n', file);
2227 }
2228 fprintf(file, "%s\n", prefix);
2229 free(data);
2230 }
2231
2232 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2233 const char *prefix)
2234 {
2235 fprintf(file, "%sGIT binary patch\n", prefix);
2236 emit_binary_diff_body(file, one, two, prefix);
2237 emit_binary_diff_body(file, two, one, prefix);
2238 }
2239
2240 int diff_filespec_is_binary(struct diff_filespec *one)
2241 {
2242 if (one->is_binary == -1) {
2243 diff_filespec_load_driver(one);
2244 if (one->driver->binary != -1)
2245 one->is_binary = one->driver->binary;
2246 else {
2247 if (!one->data && DIFF_FILE_VALID(one))
2248 diff_populate_filespec(one, CHECK_BINARY);
2249 if (one->is_binary == -1 && one->data)
2250 one->is_binary = buffer_is_binary(one->data,
2251 one->size);
2252 if (one->is_binary == -1)
2253 one->is_binary = 0;
2254 }
2255 }
2256 return one->is_binary;
2257 }
2258
2259 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2260 {
2261 diff_filespec_load_driver(one);
2262 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2263 }
2264
2265 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2266 {
2267 if (!options->a_prefix)
2268 options->a_prefix = a;
2269 if (!options->b_prefix)
2270 options->b_prefix = b;
2271 }
2272
2273 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2274 {
2275 if (!DIFF_FILE_VALID(one))
2276 return NULL;
2277
2278 diff_filespec_load_driver(one);
2279 return userdiff_get_textconv(one->driver);
2280 }
2281
2282 static void builtin_diff(const char *name_a,
2283 const char *name_b,
2284 struct diff_filespec *one,
2285 struct diff_filespec *two,
2286 const char *xfrm_msg,
2287 int must_show_header,
2288 struct diff_options *o,
2289 int complete_rewrite)
2290 {
2291 mmfile_t mf1, mf2;
2292 const char *lbl[2];
2293 char *a_one, *b_two;
2294 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2295 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2296 const char *a_prefix, *b_prefix;
2297 struct userdiff_driver *textconv_one = NULL;
2298 struct userdiff_driver *textconv_two = NULL;
2299 struct strbuf header = STRBUF_INIT;
2300 const char *line_prefix = diff_line_prefix(o);
2301
2302 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2303 (!one->mode || S_ISGITLINK(one->mode)) &&
2304 (!two->mode || S_ISGITLINK(two->mode))) {
2305 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2306 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2307 show_submodule_summary(o->file, one->path ? one->path : two->path,
2308 line_prefix,
2309 one->sha1, two->sha1, two->dirty_submodule,
2310 meta, del, add, reset);
2311 return;
2312 }
2313
2314 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2315 textconv_one = get_textconv(one);
2316 textconv_two = get_textconv(two);
2317 }
2318
2319 diff_set_mnemonic_prefix(o, "a/", "b/");
2320 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2321 a_prefix = o->b_prefix;
2322 b_prefix = o->a_prefix;
2323 } else {
2324 a_prefix = o->a_prefix;
2325 b_prefix = o->b_prefix;
2326 }
2327
2328 /* Never use a non-valid filename anywhere if at all possible */
2329 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2330 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2331
2332 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2333 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2334 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2335 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2336 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2337 if (lbl[0][0] == '/') {
2338 /* /dev/null */
2339 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2340 if (xfrm_msg)
2341 strbuf_addstr(&header, xfrm_msg);
2342 must_show_header = 1;
2343 }
2344 else if (lbl[1][0] == '/') {
2345 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2346 if (xfrm_msg)
2347 strbuf_addstr(&header, xfrm_msg);
2348 must_show_header = 1;
2349 }
2350 else {
2351 if (one->mode != two->mode) {
2352 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2353 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2354 must_show_header = 1;
2355 }
2356 if (xfrm_msg)
2357 strbuf_addstr(&header, xfrm_msg);
2358
2359 /*
2360 * we do not run diff between different kind
2361 * of objects.
2362 */
2363 if ((one->mode ^ two->mode) & S_IFMT)
2364 goto free_ab_and_return;
2365 if (complete_rewrite &&
2366 (textconv_one || !diff_filespec_is_binary(one)) &&
2367 (textconv_two || !diff_filespec_is_binary(two))) {
2368 fprintf(o->file, "%s", header.buf);
2369 strbuf_reset(&header);
2370 emit_rewrite_diff(name_a, name_b, one, two,
2371 textconv_one, textconv_two, o);
2372 o->found_changes = 1;
2373 goto free_ab_and_return;
2374 }
2375 }
2376
2377 if (o->irreversible_delete && lbl[1][0] == '/') {
2378 fprintf(o->file, "%s", header.buf);
2379 strbuf_reset(&header);
2380 goto free_ab_and_return;
2381 } else if (!DIFF_OPT_TST(o, TEXT) &&
2382 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2383 (!textconv_two && diff_filespec_is_binary(two)) )) {
2384 if (!one->data && !two->data &&
2385 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2386 !DIFF_OPT_TST(o, BINARY)) {
2387 if (!hashcmp(one->sha1, two->sha1)) {
2388 if (must_show_header)
2389 fprintf(o->file, "%s", header.buf);
2390 goto free_ab_and_return;
2391 }
2392 fprintf(o->file, "%s", header.buf);
2393 fprintf(o->file, "%sBinary files %s and %s differ\n",
2394 line_prefix, lbl[0], lbl[1]);
2395 goto free_ab_and_return;
2396 }
2397 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2398 die("unable to read files to diff");
2399 /* Quite common confusing case */
2400 if (mf1.size == mf2.size &&
2401 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2402 if (must_show_header)
2403 fprintf(o->file, "%s", header.buf);
2404 goto free_ab_and_return;
2405 }
2406 fprintf(o->file, "%s", header.buf);
2407 strbuf_reset(&header);
2408 if (DIFF_OPT_TST(o, BINARY))
2409 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2410 else
2411 fprintf(o->file, "%sBinary files %s and %s differ\n",
2412 line_prefix, lbl[0], lbl[1]);
2413 o->found_changes = 1;
2414 } else {
2415 /* Crazy xdl interfaces.. */
2416 const char *diffopts = getenv("GIT_DIFF_OPTS");
2417 const char *v;
2418 xpparam_t xpp;
2419 xdemitconf_t xecfg;
2420 struct emit_callback ecbdata;
2421 const struct userdiff_funcname *pe;
2422
2423 if (must_show_header) {
2424 fprintf(o->file, "%s", header.buf);
2425 strbuf_reset(&header);
2426 }
2427
2428 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2429 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2430
2431 pe = diff_funcname_pattern(one);
2432 if (!pe)
2433 pe = diff_funcname_pattern(two);
2434
2435 memset(&xpp, 0, sizeof(xpp));
2436 memset(&xecfg, 0, sizeof(xecfg));
2437 memset(&ecbdata, 0, sizeof(ecbdata));
2438 ecbdata.label_path = lbl;
2439 ecbdata.color_diff = want_color(o->use_color);
2440 ecbdata.found_changesp = &o->found_changes;
2441 ecbdata.ws_rule = whitespace_rule(name_b);
2442 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2443 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2444 ecbdata.opt = o;
2445 ecbdata.header = header.len ? &header : NULL;
2446 xpp.flags = o->xdl_opts;
2447 xecfg.ctxlen = o->context;
2448 xecfg.interhunkctxlen = o->interhunkcontext;
2449 xecfg.flags = XDL_EMIT_FUNCNAMES;
2450 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2451 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2452 if (pe)
2453 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2454 if (!diffopts)
2455 ;
2456 else if (skip_prefix(diffopts, "--unified=", &v))
2457 xecfg.ctxlen = strtoul(v, NULL, 10);
2458 else if (skip_prefix(diffopts, "-u", &v))
2459 xecfg.ctxlen = strtoul(v, NULL, 10);
2460 if (o->word_diff)
2461 init_diff_words_data(&ecbdata, o, one, two);
2462 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2463 &xpp, &xecfg))
2464 die("unable to generate diff for %s", one->path);
2465 if (o->word_diff)
2466 free_diff_words_data(&ecbdata);
2467 if (textconv_one)
2468 free(mf1.ptr);
2469 if (textconv_two)
2470 free(mf2.ptr);
2471 xdiff_clear_find_func(&xecfg);
2472 }
2473
2474 free_ab_and_return:
2475 strbuf_release(&header);
2476 diff_free_filespec_data(one);
2477 diff_free_filespec_data(two);
2478 free(a_one);
2479 free(b_two);
2480 return;
2481 }
2482
2483 static void builtin_diffstat(const char *name_a, const char *name_b,
2484 struct diff_filespec *one,
2485 struct diff_filespec *two,
2486 struct diffstat_t *diffstat,
2487 struct diff_options *o,
2488 struct diff_filepair *p)
2489 {
2490 mmfile_t mf1, mf2;
2491 struct diffstat_file *data;
2492 int same_contents;
2493 int complete_rewrite = 0;
2494
2495 if (!DIFF_PAIR_UNMERGED(p)) {
2496 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2497 complete_rewrite = 1;
2498 }
2499
2500 data = diffstat_add(diffstat, name_a, name_b);
2501 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2502
2503 if (!one || !two) {
2504 data->is_unmerged = 1;
2505 return;
2506 }
2507
2508 same_contents = !hashcmp(one->sha1, two->sha1);
2509
2510 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2511 data->is_binary = 1;
2512 if (same_contents) {
2513 data->added = 0;
2514 data->deleted = 0;
2515 } else {
2516 data->added = diff_filespec_size(two);
2517 data->deleted = diff_filespec_size(one);
2518 }
2519 }
2520
2521 else if (complete_rewrite) {
2522 diff_populate_filespec(one, 0);
2523 diff_populate_filespec(two, 0);
2524 data->deleted = count_lines(one->data, one->size);
2525 data->added = count_lines(two->data, two->size);
2526 }
2527
2528 else if (!same_contents) {
2529 /* Crazy xdl interfaces.. */
2530 xpparam_t xpp;
2531 xdemitconf_t xecfg;
2532
2533 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2534 die("unable to read files to diff");
2535
2536 memset(&xpp, 0, sizeof(xpp));
2537 memset(&xecfg, 0, sizeof(xecfg));
2538 xpp.flags = o->xdl_opts;
2539 xecfg.ctxlen = o->context;
2540 xecfg.interhunkctxlen = o->interhunkcontext;
2541 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2542 &xpp, &xecfg))
2543 die("unable to generate diffstat for %s", one->path);
2544 }
2545
2546 diff_free_filespec_data(one);
2547 diff_free_filespec_data(two);
2548 }
2549
2550 static void builtin_checkdiff(const char *name_a, const char *name_b,
2551 const char *attr_path,
2552 struct diff_filespec *one,
2553 struct diff_filespec *two,
2554 struct diff_options *o)
2555 {
2556 mmfile_t mf1, mf2;
2557 struct checkdiff_t data;
2558
2559 if (!two)
2560 return;
2561
2562 memset(&data, 0, sizeof(data));
2563 data.filename = name_b ? name_b : name_a;
2564 data.lineno = 0;
2565 data.o = o;
2566 data.ws_rule = whitespace_rule(attr_path);
2567 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2568
2569 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2570 die("unable to read files to diff");
2571
2572 /*
2573 * All the other codepaths check both sides, but not checking
2574 * the "old" side here is deliberate. We are checking the newly
2575 * introduced changes, and as long as the "new" side is text, we
2576 * can and should check what it introduces.
2577 */
2578 if (diff_filespec_is_binary(two))
2579 goto free_and_return;
2580 else {
2581 /* Crazy xdl interfaces.. */
2582 xpparam_t xpp;
2583 xdemitconf_t xecfg;
2584
2585 memset(&xpp, 0, sizeof(xpp));
2586 memset(&xecfg, 0, sizeof(xecfg));
2587 xecfg.ctxlen = 1; /* at least one context line */
2588 xpp.flags = 0;
2589 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2590 &xpp, &xecfg))
2591 die("unable to generate checkdiff for %s", one->path);
2592
2593 if (data.ws_rule & WS_BLANK_AT_EOF) {
2594 struct emit_callback ecbdata;
2595 int blank_at_eof;
2596
2597 ecbdata.ws_rule = data.ws_rule;
2598 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2599 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2600
2601 if (blank_at_eof) {
2602 static char *err;
2603 if (!err)
2604 err = whitespace_error_string(WS_BLANK_AT_EOF);
2605 fprintf(o->file, "%s:%d: %s.\n",
2606 data.filename, blank_at_eof, err);
2607 data.status = 1; /* report errors */
2608 }
2609 }
2610 }
2611 free_and_return:
2612 diff_free_filespec_data(one);
2613 diff_free_filespec_data(two);
2614 if (data.status)
2615 DIFF_OPT_SET(o, CHECK_FAILED);
2616 }
2617
2618 struct diff_filespec *alloc_filespec(const char *path)
2619 {
2620 struct diff_filespec *spec;
2621
2622 FLEXPTR_ALLOC_STR(spec, path, path);
2623 spec->count = 1;
2624 spec->is_binary = -1;
2625 return spec;
2626 }
2627
2628 void free_filespec(struct diff_filespec *spec)
2629 {
2630 if (!--spec->count) {
2631 diff_free_filespec_data(spec);
2632 free(spec);
2633 }
2634 }
2635
2636 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2637 int sha1_valid, unsigned short mode)
2638 {
2639 if (mode) {
2640 spec->mode = canon_mode(mode);
2641 hashcpy(spec->sha1, sha1);
2642 spec->sha1_valid = sha1_valid;
2643 }
2644 }
2645
2646 /*
2647 * Given a name and sha1 pair, if the index tells us the file in
2648 * the work tree has that object contents, return true, so that
2649 * prepare_temp_file() does not have to inflate and extract.
2650 */
2651 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2652 {
2653 const struct cache_entry *ce;
2654 struct stat st;
2655 int pos, len;
2656
2657 /*
2658 * We do not read the cache ourselves here, because the
2659 * benchmark with my previous version that always reads cache
2660 * shows that it makes things worse for diff-tree comparing
2661 * two linux-2.6 kernel trees in an already checked out work
2662 * tree. This is because most diff-tree comparisons deal with
2663 * only a small number of files, while reading the cache is
2664 * expensive for a large project, and its cost outweighs the
2665 * savings we get by not inflating the object to a temporary
2666 * file. Practically, this code only helps when we are used
2667 * by diff-cache --cached, which does read the cache before
2668 * calling us.
2669 */
2670 if (!active_cache)
2671 return 0;
2672
2673 /* We want to avoid the working directory if our caller
2674 * doesn't need the data in a normal file, this system
2675 * is rather slow with its stat/open/mmap/close syscalls,
2676 * and the object is contained in a pack file. The pack
2677 * is probably already open and will be faster to obtain
2678 * the data through than the working directory. Loose
2679 * objects however would tend to be slower as they need
2680 * to be individually opened and inflated.
2681 */
2682 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2683 return 0;
2684
2685 /*
2686 * Similarly, if we'd have to convert the file contents anyway, that
2687 * makes the optimization not worthwhile.
2688 */
2689 if (!want_file && would_convert_to_git(name))
2690 return 0;
2691
2692 len = strlen(name);
2693 pos = cache_name_pos(name, len);
2694 if (pos < 0)
2695 return 0;
2696 ce = active_cache[pos];
2697
2698 /*
2699 * This is not the sha1 we are looking for, or
2700 * unreusable because it is not a regular file.
2701 */
2702 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2703 return 0;
2704
2705 /*
2706 * If ce is marked as "assume unchanged", there is no
2707 * guarantee that work tree matches what we are looking for.
2708 */
2709 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2710 return 0;
2711
2712 /*
2713 * If ce matches the file in the work tree, we can reuse it.
2714 */
2715 if (ce_uptodate(ce) ||
2716 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2717 return 1;
2718
2719 return 0;
2720 }
2721
2722 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2723 {
2724 struct strbuf buf = STRBUF_INIT;
2725 char *dirty = "";
2726
2727 /* Are we looking at the work tree? */
2728 if (s->dirty_submodule)
2729 dirty = "-dirty";
2730
2731 strbuf_addf(&buf, "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2732 s->size = buf.len;
2733 if (size_only) {
2734 s->data = NULL;
2735 strbuf_release(&buf);
2736 } else {
2737 s->data = strbuf_detach(&buf, NULL);
2738 s->should_free = 1;
2739 }
2740 return 0;
2741 }
2742
2743 /*
2744 * While doing rename detection and pickaxe operation, we may need to
2745 * grab the data for the blob (or file) for our own in-core comparison.
2746 * diff_filespec has data and size fields for this purpose.
2747 */
2748 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2749 {
2750 int size_only = flags & CHECK_SIZE_ONLY;
2751 int err = 0;
2752 /*
2753 * demote FAIL to WARN to allow inspecting the situation
2754 * instead of refusing.
2755 */
2756 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2757 ? SAFE_CRLF_WARN
2758 : safe_crlf);
2759
2760 if (!DIFF_FILE_VALID(s))
2761 die("internal error: asking to populate invalid file.");
2762 if (S_ISDIR(s->mode))
2763 return -1;
2764
2765 if (s->data)
2766 return 0;
2767
2768 if (size_only && 0 < s->size)
2769 return 0;
2770
2771 if (S_ISGITLINK(s->mode))
2772 return diff_populate_gitlink(s, size_only);
2773
2774 if (!s->sha1_valid ||
2775 reuse_worktree_file(s->path, s->sha1, 0)) {
2776 struct strbuf buf = STRBUF_INIT;
2777 struct stat st;
2778 int fd;
2779
2780 if (lstat(s->path, &st) < 0) {
2781 if (errno == ENOENT) {
2782 err_empty:
2783 err = -1;
2784 empty:
2785 s->data = (char *)"";
2786 s->size = 0;
2787 return err;
2788 }
2789 }
2790 s->size = xsize_t(st.st_size);
2791 if (!s->size)
2792 goto empty;
2793 if (S_ISLNK(st.st_mode)) {
2794 struct strbuf sb = STRBUF_INIT;
2795
2796 if (strbuf_readlink(&sb, s->path, s->size))
2797 goto err_empty;
2798 s->size = sb.len;
2799 s->data = strbuf_detach(&sb, NULL);
2800 s->should_free = 1;
2801 return 0;
2802 }
2803 if (size_only)
2804 return 0;
2805 if ((flags & CHECK_BINARY) &&
2806 s->size > big_file_threshold && s->is_binary == -1) {
2807 s->is_binary = 1;
2808 return 0;
2809 }
2810 fd = open(s->path, O_RDONLY);
2811 if (fd < 0)
2812 goto err_empty;
2813 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2814 close(fd);
2815 s->should_munmap = 1;
2816
2817 /*
2818 * Convert from working tree format to canonical git format
2819 */
2820 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2821 size_t size = 0;
2822 munmap(s->data, s->size);
2823 s->should_munmap = 0;
2824 s->data = strbuf_detach(&buf, &size);
2825 s->size = size;
2826 s->should_free = 1;
2827 }
2828 }
2829 else {
2830 enum object_type type;
2831 if (size_only || (flags & CHECK_BINARY)) {
2832 type = sha1_object_info(s->sha1, &s->size);
2833 if (type < 0)
2834 die("unable to read %s", sha1_to_hex(s->sha1));
2835 if (size_only)
2836 return 0;
2837 if (s->size > big_file_threshold && s->is_binary == -1) {
2838 s->is_binary = 1;
2839 return 0;
2840 }
2841 }
2842 s->data = read_sha1_file(s->sha1, &type, &s->size);
2843 if (!s->data)
2844 die("unable to read %s", sha1_to_hex(s->sha1));
2845 s->should_free = 1;
2846 }
2847 return 0;
2848 }
2849
2850 void diff_free_filespec_blob(struct diff_filespec *s)
2851 {
2852 if (s->should_free)
2853 free(s->data);
2854 else if (s->should_munmap)
2855 munmap(s->data, s->size);
2856
2857 if (s->should_free || s->should_munmap) {
2858 s->should_free = s->should_munmap = 0;
2859 s->data = NULL;
2860 }
2861 }
2862
2863 void diff_free_filespec_data(struct diff_filespec *s)
2864 {
2865 diff_free_filespec_blob(s);
2866 free(s->cnt_data);
2867 s->cnt_data = NULL;
2868 }
2869
2870 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2871 void *blob,
2872 unsigned long size,
2873 const unsigned char *sha1,
2874 int mode)
2875 {
2876 int fd;
2877 struct strbuf buf = STRBUF_INIT;
2878 struct strbuf template = STRBUF_INIT;
2879 char *path_dup = xstrdup(path);
2880 const char *base = basename(path_dup);
2881
2882 /* Generate "XXXXXX_basename.ext" */
2883 strbuf_addstr(&template, "XXXXXX_");
2884 strbuf_addstr(&template, base);
2885
2886 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2887 if (fd < 0)
2888 die_errno("unable to create temp-file");
2889 if (convert_to_working_tree(path,
2890 (const char *)blob, (size_t)size, &buf)) {
2891 blob = buf.buf;
2892 size = buf.len;
2893 }
2894 if (write_in_full(fd, blob, size) != size)
2895 die_errno("unable to write temp-file");
2896 close_tempfile(&temp->tempfile);
2897 temp->name = get_tempfile_path(&temp->tempfile);
2898 sha1_to_hex_r(temp->hex, sha1);
2899 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2900 strbuf_release(&buf);
2901 strbuf_release(&template);
2902 free(path_dup);
2903 }
2904
2905 static struct diff_tempfile *prepare_temp_file(const char *name,
2906 struct diff_filespec *one)
2907 {
2908 struct diff_tempfile *temp = claim_diff_tempfile();
2909
2910 if (!DIFF_FILE_VALID(one)) {
2911 not_a_valid_file:
2912 /* A '-' entry produces this for file-2, and
2913 * a '+' entry produces this for file-1.
2914 */
2915 temp->name = "/dev/null";
2916 xsnprintf(temp->hex, sizeof(temp->hex), ".");
2917 xsnprintf(temp->mode, sizeof(temp->mode), ".");
2918 return temp;
2919 }
2920
2921 if (!S_ISGITLINK(one->mode) &&
2922 (!one->sha1_valid ||
2923 reuse_worktree_file(name, one->sha1, 1))) {
2924 struct stat st;
2925 if (lstat(name, &st) < 0) {
2926 if (errno == ENOENT)
2927 goto not_a_valid_file;
2928 die_errno("stat(%s)", name);
2929 }
2930 if (S_ISLNK(st.st_mode)) {
2931 struct strbuf sb = STRBUF_INIT;
2932 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2933 die_errno("readlink(%s)", name);
2934 prep_temp_blob(name, temp, sb.buf, sb.len,
2935 (one->sha1_valid ?
2936 one->sha1 : null_sha1),
2937 (one->sha1_valid ?
2938 one->mode : S_IFLNK));
2939 strbuf_release(&sb);
2940 }
2941 else {
2942 /* we can borrow from the file in the work tree */
2943 temp->name = name;
2944 if (!one->sha1_valid)
2945 sha1_to_hex_r(temp->hex, null_sha1);
2946 else
2947 sha1_to_hex_r(temp->hex, one->sha1);
2948 /* Even though we may sometimes borrow the
2949 * contents from the work tree, we always want
2950 * one->mode. mode is trustworthy even when
2951 * !(one->sha1_valid), as long as
2952 * DIFF_FILE_VALID(one).
2953 */
2954 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
2955 }
2956 return temp;
2957 }
2958 else {
2959 if (diff_populate_filespec(one, 0))
2960 die("cannot read data blob for %s", one->path);
2961 prep_temp_blob(name, temp, one->data, one->size,
2962 one->sha1, one->mode);
2963 }
2964 return temp;
2965 }
2966
2967 static void add_external_diff_name(struct argv_array *argv,
2968 const char *name,
2969 struct diff_filespec *df)
2970 {
2971 struct diff_tempfile *temp = prepare_temp_file(name, df);
2972 argv_array_push(argv, temp->name);
2973 argv_array_push(argv, temp->hex);
2974 argv_array_push(argv, temp->mode);
2975 }
2976
2977 /* An external diff command takes:
2978 *
2979 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2980 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2981 *
2982 */
2983 static void run_external_diff(const char *pgm,
2984 const char *name,
2985 const char *other,
2986 struct diff_filespec *one,
2987 struct diff_filespec *two,
2988 const char *xfrm_msg,
2989 int complete_rewrite,
2990 struct diff_options *o)
2991 {
2992 struct argv_array argv = ARGV_ARRAY_INIT;
2993 struct argv_array env = ARGV_ARRAY_INIT;
2994 struct diff_queue_struct *q = &diff_queued_diff;
2995
2996 argv_array_push(&argv, pgm);
2997 argv_array_push(&argv, name);
2998
2999 if (one && two) {
3000 add_external_diff_name(&argv, name, one);
3001 if (!other)
3002 add_external_diff_name(&argv, name, two);
3003 else {
3004 add_external_diff_name(&argv, other, two);
3005 argv_array_push(&argv, other);
3006 argv_array_push(&argv, xfrm_msg);
3007 }
3008 }
3009
3010 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3011 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3012
3013 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3014 die(_("external diff died, stopping at %s"), name);
3015
3016 remove_tempfile();
3017 argv_array_clear(&argv);
3018 argv_array_clear(&env);
3019 }
3020
3021 static int similarity_index(struct diff_filepair *p)
3022 {
3023 return p->score * 100 / MAX_SCORE;
3024 }
3025
3026 static void fill_metainfo(struct strbuf *msg,
3027 const char *name,
3028 const char *other,
3029 struct diff_filespec *one,
3030 struct diff_filespec *two,
3031 struct diff_options *o,
3032 struct diff_filepair *p,
3033 int *must_show_header,
3034 int use_color)
3035 {
3036 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3037 const char *reset = diff_get_color(use_color, DIFF_RESET);
3038 const char *line_prefix = diff_line_prefix(o);
3039
3040 *must_show_header = 1;
3041 strbuf_init(msg, PATH_MAX * 2 + 300);
3042 switch (p->status) {
3043 case DIFF_STATUS_COPIED:
3044 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3045 line_prefix, set, similarity_index(p));
3046 strbuf_addf(msg, "%s\n%s%scopy from ",
3047 reset, line_prefix, set);
3048 quote_c_style(name, msg, NULL, 0);
3049 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3050 quote_c_style(other, msg, NULL, 0);
3051 strbuf_addf(msg, "%s\n", reset);
3052 break;
3053 case DIFF_STATUS_RENAMED:
3054 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3055 line_prefix, set, similarity_index(p));
3056 strbuf_addf(msg, "%s\n%s%srename from ",
3057 reset, line_prefix, set);
3058 quote_c_style(name, msg, NULL, 0);
3059 strbuf_addf(msg, "%s\n%s%srename to ",
3060 reset, line_prefix, set);
3061 quote_c_style(other, msg, NULL, 0);
3062 strbuf_addf(msg, "%s\n", reset);
3063 break;
3064 case DIFF_STATUS_MODIFIED:
3065 if (p->score) {
3066 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3067 line_prefix,
3068 set, similarity_index(p), reset);
3069 break;
3070 }
3071 /* fallthru */
3072 default:
3073 *must_show_header = 0;
3074 }
3075 if (one && two && hashcmp(one->sha1, two->sha1)) {
3076 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3077
3078 if (DIFF_OPT_TST(o, BINARY)) {
3079 mmfile_t mf;
3080 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3081 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3082 abbrev = 40;
3083 }
3084 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3085 find_unique_abbrev(one->sha1, abbrev));
3086 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
3087 if (one->mode == two->mode)
3088 strbuf_addf(msg, " %06o", one->mode);
3089 strbuf_addf(msg, "%s\n", reset);
3090 }
3091 }
3092
3093 static void run_diff_cmd(const char *pgm,
3094 const char *name,
3095 const char *other,
3096 const char *attr_path,
3097 struct diff_filespec *one,
3098 struct diff_filespec *two,
3099 struct strbuf *msg,
3100 struct diff_options *o,
3101 struct diff_filepair *p)
3102 {
3103 const char *xfrm_msg = NULL;
3104 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3105 int must_show_header = 0;
3106
3107
3108 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3109 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3110 if (drv && drv->external)
3111 pgm = drv->external;
3112 }
3113
3114 if (msg) {
3115 /*
3116 * don't use colors when the header is intended for an
3117 * external diff driver
3118 */
3119 fill_metainfo(msg, name, other, one, two, o, p,
3120 &must_show_header,
3121 want_color(o->use_color) && !pgm);
3122 xfrm_msg = msg->len ? msg->buf : NULL;
3123 }
3124
3125 if (pgm) {
3126 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3127 complete_rewrite, o);
3128 return;
3129 }
3130 if (one && two)
3131 builtin_diff(name, other ? other : name,
3132 one, two, xfrm_msg, must_show_header,
3133 o, complete_rewrite);
3134 else
3135 fprintf(o->file, "* Unmerged path %s\n", name);
3136 }
3137
3138 static void diff_fill_sha1_info(struct diff_filespec *one)
3139 {
3140 if (DIFF_FILE_VALID(one)) {
3141 if (!one->sha1_valid) {
3142 struct stat st;
3143 if (one->is_stdin) {
3144 hashcpy(one->sha1, null_sha1);
3145 return;
3146 }
3147 if (lstat(one->path, &st) < 0)
3148 die_errno("stat '%s'", one->path);
3149 if (index_path(one->sha1, one->path, &st, 0))
3150 die("cannot hash %s", one->path);
3151 }
3152 }
3153 else
3154 hashclr(one->sha1);
3155 }
3156
3157 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3158 {
3159 /* Strip the prefix but do not molest /dev/null and absolute paths */
3160 if (*namep && **namep != '/') {
3161 *namep += prefix_length;
3162 if (**namep == '/')
3163 ++*namep;
3164 }
3165 if (*otherp && **otherp != '/') {
3166 *otherp += prefix_length;
3167 if (**otherp == '/')
3168 ++*otherp;
3169 }
3170 }
3171
3172 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3173 {
3174 const char *pgm = external_diff();
3175 struct strbuf msg;
3176 struct diff_filespec *one = p->one;
3177 struct diff_filespec *two = p->two;
3178 const char *name;
3179 const char *other;
3180 const char *attr_path;
3181
3182 name = p->one->path;
3183 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3184 attr_path = name;
3185 if (o->prefix_length)
3186 strip_prefix(o->prefix_length, &name, &other);
3187
3188 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3189 pgm = NULL;
3190
3191 if (DIFF_PAIR_UNMERGED(p)) {
3192 run_diff_cmd(pgm, name, NULL, attr_path,
3193 NULL, NULL, NULL, o, p);
3194 return;
3195 }
3196
3197 diff_fill_sha1_info(one);
3198 diff_fill_sha1_info(two);
3199
3200 if (!pgm &&
3201 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3202 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3203 /*
3204 * a filepair that changes between file and symlink
3205 * needs to be split into deletion and creation.
3206 */
3207 struct diff_filespec *null = alloc_filespec(two->path);
3208 run_diff_cmd(NULL, name, other, attr_path,
3209 one, null, &msg, o, p);
3210 free(null);
3211 strbuf_release(&msg);
3212
3213 null = alloc_filespec(one->path);
3214 run_diff_cmd(NULL, name, other, attr_path,
3215 null, two, &msg, o, p);
3216 free(null);
3217 }
3218 else
3219 run_diff_cmd(pgm, name, other, attr_path,
3220 one, two, &msg, o, p);
3221
3222 strbuf_release(&msg);
3223 }
3224
3225 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3226 struct diffstat_t *diffstat)
3227 {
3228 const char *name;
3229 const char *other;
3230
3231 if (DIFF_PAIR_UNMERGED(p)) {
3232 /* unmerged */
3233 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3234 return;
3235 }
3236
3237 name = p->one->path;
3238 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3239
3240 if (o->prefix_length)
3241 strip_prefix(o->prefix_length, &name, &other);
3242
3243 diff_fill_sha1_info(p->one);
3244 diff_fill_sha1_info(p->two);
3245
3246 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3247 }
3248
3249 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3250 {
3251 const char *name;
3252 const char *other;
3253 const char *attr_path;
3254
3255 if (DIFF_PAIR_UNMERGED(p)) {
3256 /* unmerged */
3257 return;
3258 }
3259
3260 name = p->one->path;
3261 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3262 attr_path = other ? other : name;
3263
3264 if (o->prefix_length)
3265 strip_prefix(o->prefix_length, &name, &other);
3266
3267 diff_fill_sha1_info(p->one);
3268 diff_fill_sha1_info(p->two);
3269
3270 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3271 }
3272
3273 void diff_setup(struct diff_options *options)
3274 {
3275 memcpy(options, &default_diff_options, sizeof(*options));
3276
3277 options->file = stdout;
3278
3279 options->line_termination = '\n';
3280 options->break_opt = -1;
3281 options->rename_limit = -1;
3282 options->dirstat_permille = diff_dirstat_permille_default;
3283 options->context = diff_context_default;
3284 options->ws_error_highlight = WSEH_NEW;
3285 DIFF_OPT_SET(options, RENAME_EMPTY);
3286
3287 /* pathchange left =NULL by default */
3288 options->change = diff_change;
3289 options->add_remove = diff_addremove;
3290 options->use_color = diff_use_color_default;
3291 options->detect_rename = diff_detect_rename_default;
3292 options->xdl_opts |= diff_algorithm;
3293 if (diff_compaction_heuristic)
3294 DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
3295
3296 options->orderfile = diff_order_file_cfg;
3297
3298 if (diff_no_prefix) {
3299 options->a_prefix = options->b_prefix = "";
3300 } else if (!diff_mnemonic_prefix) {
3301 options->a_prefix = "a/";
3302 options->b_prefix = "b/";
3303 }
3304 }
3305
3306 void diff_setup_done(struct diff_options *options)
3307 {
3308 int count = 0;
3309
3310 if (options->set_default)
3311 options->set_default(options);
3312
3313 if (options->output_format & DIFF_FORMAT_NAME)
3314 count++;
3315 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3316 count++;
3317 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3318 count++;
3319 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3320 count++;
3321 if (count > 1)
3322 die("--name-only, --name-status, --check and -s are mutually exclusive");
3323
3324 /*
3325 * Most of the time we can say "there are changes"
3326 * only by checking if there are changed paths, but
3327 * --ignore-whitespace* options force us to look
3328 * inside contents.
3329 */
3330
3331 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3332 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3333 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3334 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3335 else
3336 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3337
3338 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3339 options->detect_rename = DIFF_DETECT_COPY;
3340
3341 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3342 options->prefix = NULL;
3343 if (options->prefix)
3344 options->prefix_length = strlen(options->prefix);
3345 else
3346 options->prefix_length = 0;
3347
3348 if (options->output_format & (DIFF_FORMAT_NAME |
3349 DIFF_FORMAT_NAME_STATUS |
3350 DIFF_FORMAT_CHECKDIFF |
3351 DIFF_FORMAT_NO_OUTPUT))
3352 options->output_format &= ~(DIFF_FORMAT_RAW |
3353 DIFF_FORMAT_NUMSTAT |
3354 DIFF_FORMAT_DIFFSTAT |
3355 DIFF_FORMAT_SHORTSTAT |
3356 DIFF_FORMAT_DIRSTAT |
3357 DIFF_FORMAT_SUMMARY |
3358 DIFF_FORMAT_PATCH);
3359
3360 /*
3361 * These cases always need recursive; we do not drop caller-supplied
3362 * recursive bits for other formats here.
3363 */
3364 if (options->output_format & (DIFF_FORMAT_PATCH |
3365 DIFF_FORMAT_NUMSTAT |
3366 DIFF_FORMAT_DIFFSTAT |
3367 DIFF_FORMAT_SHORTSTAT |
3368 DIFF_FORMAT_DIRSTAT |
3369 DIFF_FORMAT_SUMMARY |
3370 DIFF_FORMAT_CHECKDIFF))
3371 DIFF_OPT_SET(options, RECURSIVE);
3372 /*
3373 * Also pickaxe would not work very well if you do not say recursive
3374 */
3375 if (options->pickaxe)
3376 DIFF_OPT_SET(options, RECURSIVE);
3377 /*
3378 * When patches are generated, submodules diffed against the work tree
3379 * must be checked for dirtiness too so it can be shown in the output
3380 */
3381 if (options->output_format & DIFF_FORMAT_PATCH)
3382 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3383
3384 if (options->detect_rename && options->rename_limit < 0)
3385 options->rename_limit = diff_rename_limit_default;
3386 if (options->setup & DIFF_SETUP_USE_CACHE) {
3387 if (!active_cache)
3388 /* read-cache does not die even when it fails
3389 * so it is safe for us to do this here. Also
3390 * it does not smudge active_cache or active_nr
3391 * when it fails, so we do not have to worry about
3392 * cleaning it up ourselves either.
3393 */
3394 read_cache();
3395 }
3396 if (options->abbrev <= 0 || 40 < options->abbrev)
3397 options->abbrev = 40; /* full */
3398
3399 /*
3400 * It does not make sense to show the first hit we happened
3401 * to have found. It does not make sense not to return with
3402 * exit code in such a case either.
3403 */
3404 if (DIFF_OPT_TST(options, QUICK)) {
3405 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3406 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3407 }
3408
3409 options->diff_path_counter = 0;
3410
3411 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3412 die(_("--follow requires exactly one pathspec"));
3413 }
3414
3415 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3416 {
3417 char c, *eq;
3418 int len;
3419
3420 if (*arg != '-')
3421 return 0;
3422 c = *++arg;
3423 if (!c)
3424 return 0;
3425 if (c == arg_short) {
3426 c = *++arg;
3427 if (!c)
3428 return 1;
3429 if (val && isdigit(c)) {
3430 char *end;
3431 int n = strtoul(arg, &end, 10);
3432 if (*end)
3433 return 0;
3434 *val = n;
3435 return 1;
3436 }
3437 return 0;
3438 }
3439 if (c != '-')
3440 return 0;
3441 arg++;
3442 eq = strchrnul(arg, '=');
3443 len = eq - arg;
3444 if (!len || strncmp(arg, arg_long, len))
3445 return 0;
3446 if (*eq) {
3447 int n;
3448 char *end;
3449 if (!isdigit(*++eq))
3450 return 0;
3451 n = strtoul(eq, &end, 10);
3452 if (*end)
3453 return 0;
3454 *val = n;
3455 }
3456 return 1;
3457 }
3458
3459 static int diff_scoreopt_parse(const char *opt);
3460
3461 static inline int short_opt(char opt, const char **argv,
3462 const char **optarg)
3463 {
3464 const char *arg = argv[0];
3465 if (arg[0] != '-' || arg[1] != opt)
3466 return 0;
3467 if (arg[2] != '\0') {
3468 *optarg = arg + 2;
3469 return 1;
3470 }
3471 if (!argv[1])
3472 die("Option '%c' requires a value", opt);
3473 *optarg = argv[1];
3474 return 2;
3475 }
3476
3477 int parse_long_opt(const char *opt, const char **argv,
3478 const char **optarg)
3479 {
3480 const char *arg = argv[0];
3481 if (!skip_prefix(arg, "--", &arg))
3482 return 0;
3483 if (!skip_prefix(arg, opt, &arg))
3484 return 0;
3485 if (*arg == '=') { /* stuck form: --option=value */
3486 *optarg = arg + 1;
3487 return 1;
3488 }
3489 if (*arg != '\0')
3490 return 0;
3491 /* separate form: --option value */
3492 if (!argv[1])
3493 die("Option '--%s' requires a value", opt);
3494 *optarg = argv[1];
3495 return 2;
3496 }
3497
3498 static int stat_opt(struct diff_options *options, const char **av)
3499 {
3500 const char *arg = av[0];
3501 char *end;
3502 int width = options->stat_width;
3503 int name_width = options->stat_name_width;
3504 int graph_width = options->stat_graph_width;
3505 int count = options->stat_count;
3506 int argcount = 1;
3507
3508 if (!skip_prefix(arg, "--stat", &arg))
3509 die("BUG: stat option does not begin with --stat: %s", arg);
3510 end = (char *)arg;
3511
3512 switch (*arg) {
3513 case '-':
3514 if (skip_prefix(arg, "-width", &arg)) {
3515 if (*arg == '=')
3516 width = strtoul(arg + 1, &end, 10);
3517 else if (!*arg && !av[1])
3518 die("Option '--stat-width' requires a value");
3519 else if (!*arg) {
3520 width = strtoul(av[1], &end, 10);
3521 argcount = 2;
3522 }
3523 } else if (skip_prefix(arg, "-name-width", &arg)) {
3524 if (*arg == '=')
3525 name_width = strtoul(arg + 1, &end, 10);
3526 else if (!*arg && !av[1])
3527 die("Option '--stat-name-width' requires a value");
3528 else if (!*arg) {
3529 name_width = strtoul(av[1], &end, 10);
3530 argcount = 2;
3531 }
3532 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3533 if (*arg == '=')
3534 graph_width = strtoul(arg + 1, &end, 10);
3535 else if (!*arg && !av[1])
3536 die("Option '--stat-graph-width' requires a value");
3537 else if (!*arg) {
3538 graph_width = strtoul(av[1], &end, 10);
3539 argcount = 2;
3540 }
3541 } else if (skip_prefix(arg, "-count", &arg)) {
3542 if (*arg == '=')
3543 count = strtoul(arg + 1, &end, 10);
3544 else if (!*arg && !av[1])
3545 die("Option '--stat-count' requires a value");
3546 else if (!*arg) {
3547 count = strtoul(av[1], &end, 10);
3548 argcount = 2;
3549 }
3550 }
3551 break;
3552 case '=':
3553 width = strtoul(arg+1, &end, 10);
3554 if (*end == ',')
3555 name_width = strtoul(end+1, &end, 10);
3556 if (*end == ',')
3557 count = strtoul(end+1, &end, 10);
3558 }
3559
3560 /* Important! This checks all the error cases! */
3561 if (*end)
3562 return 0;
3563 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3564 options->stat_name_width = name_width;
3565 options->stat_graph_width = graph_width;
3566 options->stat_width = width;
3567 options->stat_count = count;
3568 return argcount;
3569 }
3570
3571 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3572 {
3573 struct strbuf errmsg = STRBUF_INIT;
3574 if (parse_dirstat_params(options, params, &errmsg))
3575 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3576 errmsg.buf);
3577 strbuf_release(&errmsg);
3578 /*
3579 * The caller knows a dirstat-related option is given from the command
3580 * line; allow it to say "return this_function();"
3581 */
3582 options->output_format |= DIFF_FORMAT_DIRSTAT;
3583 return 1;
3584 }
3585
3586 static int parse_submodule_opt(struct diff_options *options, const char *value)
3587 {
3588 if (parse_submodule_params(options, value))
3589 die(_("Failed to parse --submodule option parameter: '%s'"),
3590 value);
3591 return 1;
3592 }
3593
3594 static const char diff_status_letters[] = {
3595 DIFF_STATUS_ADDED,
3596 DIFF_STATUS_COPIED,
3597 DIFF_STATUS_DELETED,
3598 DIFF_STATUS_MODIFIED,
3599 DIFF_STATUS_RENAMED,
3600 DIFF_STATUS_TYPE_CHANGED,
3601 DIFF_STATUS_UNKNOWN,
3602 DIFF_STATUS_UNMERGED,
3603 DIFF_STATUS_FILTER_AON,
3604 DIFF_STATUS_FILTER_BROKEN,
3605 '\0',
3606 };
3607
3608 static unsigned int filter_bit['Z' + 1];
3609
3610 static void prepare_filter_bits(void)
3611 {
3612 int i;
3613
3614 if (!filter_bit[DIFF_STATUS_ADDED]) {
3615 for (i = 0; diff_status_letters[i]; i++)
3616 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3617 }
3618 }
3619
3620 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3621 {
3622 return opt->filter & filter_bit[(int) status];
3623 }
3624
3625 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3626 {
3627 int i, optch;
3628
3629 prepare_filter_bits();
3630
3631 /*
3632 * If there is a negation e.g. 'd' in the input, and we haven't
3633 * initialized the filter field with another --diff-filter, start
3634 * from full set of bits, except for AON.
3635 */
3636 if (!opt->filter) {
3637 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3638 if (optch < 'a' || 'z' < optch)
3639 continue;
3640 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3641 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3642 break;
3643 }
3644 }
3645
3646 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3647 unsigned int bit;
3648 int negate;
3649
3650 if ('a' <= optch && optch <= 'z') {
3651 negate = 1;
3652 optch = toupper(optch);
3653 } else {
3654 negate = 0;
3655 }
3656
3657 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3658 if (!bit)
3659 return optarg[i];
3660 if (negate)
3661 opt->filter &= ~bit;
3662 else
3663 opt->filter |= bit;
3664 }
3665 return 0;
3666 }
3667
3668 static void enable_patch_output(int *fmt) {
3669 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3670 *fmt |= DIFF_FORMAT_PATCH;
3671 }
3672
3673 static int parse_one_token(const char **arg, const char *token)
3674 {
3675 const char *rest;
3676 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3677 *arg = rest;
3678 return 1;
3679 }
3680 return 0;
3681 }
3682
3683 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3684 {
3685 const char *orig_arg = arg;
3686 unsigned val = 0;
3687 while (*arg) {
3688 if (parse_one_token(&arg, "none"))
3689 val = 0;
3690 else if (parse_one_token(&arg, "default"))
3691 val = WSEH_NEW;
3692 else if (parse_one_token(&arg, "all"))
3693 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3694 else if (parse_one_token(&arg, "new"))
3695 val |= WSEH_NEW;
3696 else if (parse_one_token(&arg, "old"))
3697 val |= WSEH_OLD;
3698 else if (parse_one_token(&arg, "context"))
3699 val |= WSEH_CONTEXT;
3700 else {
3701 error("unknown value after ws-error-highlight=%.*s",
3702 (int)(arg - orig_arg), orig_arg);
3703 return 0;
3704 }
3705 if (*arg)
3706 arg++;
3707 }
3708 opt->ws_error_highlight = val;
3709 return 1;
3710 }
3711
3712 int diff_opt_parse(struct diff_options *options,
3713 const char **av, int ac, const char *prefix)
3714 {
3715 const char *arg = av[0];
3716 const char *optarg;
3717 int argcount;
3718
3719 if (!prefix)
3720 prefix = "";
3721
3722 /* Output format options */
3723 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3724 || opt_arg(arg, 'U', "unified", &options->context))
3725 enable_patch_output(&options->output_format);
3726 else if (!strcmp(arg, "--raw"))
3727 options->output_format |= DIFF_FORMAT_RAW;
3728 else if (!strcmp(arg, "--patch-with-raw")) {
3729 enable_patch_output(&options->output_format);
3730 options->output_format |= DIFF_FORMAT_RAW;
3731 } else if (!strcmp(arg, "--numstat"))
3732 options->output_format |= DIFF_FORMAT_NUMSTAT;
3733 else if (!strcmp(arg, "--shortstat"))
3734 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3735 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3736 return parse_dirstat_opt(options, "");
3737 else if (skip_prefix(arg, "-X", &arg))
3738 return parse_dirstat_opt(options, arg);
3739 else if (skip_prefix(arg, "--dirstat=", &arg))
3740 return parse_dirstat_opt(options, arg);
3741 else if (!strcmp(arg, "--cumulative"))
3742 return parse_dirstat_opt(options, "cumulative");
3743 else if (!strcmp(arg, "--dirstat-by-file"))
3744 return parse_dirstat_opt(options, "files");
3745 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3746 parse_dirstat_opt(options, "files");
3747 return parse_dirstat_opt(options, arg);
3748 }
3749 else if (!strcmp(arg, "--check"))
3750 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3751 else if (!strcmp(arg, "--summary"))
3752 options->output_format |= DIFF_FORMAT_SUMMARY;
3753 else if (!strcmp(arg, "--patch-with-stat")) {
3754 enable_patch_output(&options->output_format);
3755 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3756 } else if (!strcmp(arg, "--name-only"))
3757 options->output_format |= DIFF_FORMAT_NAME;
3758 else if (!strcmp(arg, "--name-status"))
3759 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3760 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3761 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3762 else if (starts_with(arg, "--stat"))
3763 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3764 return stat_opt(options, av);
3765
3766 /* renames options */
3767 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3768 !strcmp(arg, "--break-rewrites")) {
3769 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3770 return error("invalid argument to -B: %s", arg+2);
3771 }
3772 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3773 !strcmp(arg, "--find-renames")) {
3774 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3775 return error("invalid argument to -M: %s", arg+2);
3776 options->detect_rename = DIFF_DETECT_RENAME;
3777 }
3778 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3779 options->irreversible_delete = 1;
3780 }
3781 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3782 !strcmp(arg, "--find-copies")) {
3783 if (options->detect_rename == DIFF_DETECT_COPY)
3784 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3785 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3786 return error("invalid argument to -C: %s", arg+2);
3787 options->detect_rename = DIFF_DETECT_COPY;
3788 }
3789 else if (!strcmp(arg, "--no-renames"))
3790 options->detect_rename = 0;
3791 else if (!strcmp(arg, "--rename-empty"))
3792 DIFF_OPT_SET(options, RENAME_EMPTY);
3793 else if (!strcmp(arg, "--no-rename-empty"))
3794 DIFF_OPT_CLR(options, RENAME_EMPTY);
3795 else if (!strcmp(arg, "--relative"))
3796 DIFF_OPT_SET(options, RELATIVE_NAME);
3797 else if (skip_prefix(arg, "--relative=", &arg)) {
3798 DIFF_OPT_SET(options, RELATIVE_NAME);
3799 options->prefix = arg;
3800 }
3801
3802 /* xdiff options */
3803 else if (!strcmp(arg, "--minimal"))
3804 DIFF_XDL_SET(options, NEED_MINIMAL);
3805 else if (!strcmp(arg, "--no-minimal"))
3806 DIFF_XDL_CLR(options, NEED_MINIMAL);
3807 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3808 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3809 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3810 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3811 else if (!strcmp(arg, "--ignore-space-at-eol"))
3812 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3813 else if (!strcmp(arg, "--ignore-blank-lines"))
3814 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3815 else if (!strcmp(arg, "--compaction-heuristic"))
3816 DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
3817 else if (!strcmp(arg, "--no-compaction-heuristic"))
3818 DIFF_XDL_CLR(options, COMPACTION_HEURISTIC);
3819 else if (!strcmp(arg, "--patience"))
3820 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3821 else if (!strcmp(arg, "--histogram"))
3822 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3823 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3824 long value = parse_algorithm_value(optarg);
3825 if (value < 0)
3826 return error("option diff-algorithm accepts \"myers\", "
3827 "\"minimal\", \"patience\" and \"histogram\"");
3828 /* clear out previous settings */
3829 DIFF_XDL_CLR(options, NEED_MINIMAL);
3830 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3831 options->xdl_opts |= value;
3832 return argcount;
3833 }
3834
3835 /* flags options */
3836 else if (!strcmp(arg, "--binary")) {
3837 enable_patch_output(&options->output_format);
3838 DIFF_OPT_SET(options, BINARY);
3839 }
3840 else if (!strcmp(arg, "--full-index"))
3841 DIFF_OPT_SET(options, FULL_INDEX);
3842 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3843 DIFF_OPT_SET(options, TEXT);
3844 else if (!strcmp(arg, "-R"))
3845 DIFF_OPT_SET(options, REVERSE_DIFF);
3846 else if (!strcmp(arg, "--find-copies-harder"))
3847 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3848 else if (!strcmp(arg, "--follow"))
3849 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3850 else if (!strcmp(arg, "--no-follow")) {
3851 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3852 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3853 } else if (!strcmp(arg, "--color"))
3854 options->use_color = 1;
3855 else if (skip_prefix(arg, "--color=", &arg)) {
3856 int value = git_config_colorbool(NULL, arg);
3857 if (value < 0)
3858 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3859 options->use_color = value;
3860 }
3861 else if (!strcmp(arg, "--no-color"))
3862 options->use_color = 0;
3863 else if (!strcmp(arg, "--color-words")) {
3864 options->use_color = 1;
3865 options->word_diff = DIFF_WORDS_COLOR;
3866 }
3867 else if (skip_prefix(arg, "--color-words=", &arg)) {
3868 options->use_color = 1;
3869 options->word_diff = DIFF_WORDS_COLOR;
3870 options->word_regex = arg;
3871 }
3872 else if (!strcmp(arg, "--word-diff")) {
3873 if (options->word_diff == DIFF_WORDS_NONE)
3874 options->word_diff = DIFF_WORDS_PLAIN;
3875 }
3876 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3877 if (!strcmp(arg, "plain"))
3878 options->word_diff = DIFF_WORDS_PLAIN;
3879 else if (!strcmp(arg, "color")) {
3880 options->use_color = 1;
3881 options->word_diff = DIFF_WORDS_COLOR;
3882 }
3883 else if (!strcmp(arg, "porcelain"))
3884 options->word_diff = DIFF_WORDS_PORCELAIN;
3885 else if (!strcmp(arg, "none"))
3886 options->word_diff = DIFF_WORDS_NONE;
3887 else
3888 die("bad --word-diff argument: %s", arg);
3889 }
3890 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3891 if (options->word_diff == DIFF_WORDS_NONE)
3892 options->word_diff = DIFF_WORDS_PLAIN;
3893 options->word_regex = optarg;
3894 return argcount;
3895 }
3896 else if (!strcmp(arg, "--exit-code"))
3897 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3898 else if (!strcmp(arg, "--quiet"))
3899 DIFF_OPT_SET(options, QUICK);
3900 else if (!strcmp(arg, "--ext-diff"))
3901 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3902 else if (!strcmp(arg, "--no-ext-diff"))
3903 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3904 else if (!strcmp(arg, "--textconv"))
3905 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3906 else if (!strcmp(arg, "--no-textconv"))
3907 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3908 else if (!strcmp(arg, "--ignore-submodules")) {
3909 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3910 handle_ignore_submodules_arg(options, "all");
3911 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3912 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3913 handle_ignore_submodules_arg(options, arg);
3914 } else if (!strcmp(arg, "--submodule"))
3915 DIFF_OPT_SET(options, SUBMODULE_LOG);
3916 else if (skip_prefix(arg, "--submodule=", &arg))
3917 return parse_submodule_opt(options, arg);
3918 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3919 return parse_ws_error_highlight(options, arg);
3920
3921 /* misc options */
3922 else if (!strcmp(arg, "-z"))
3923 options->line_termination = 0;
3924 else if ((argcount = short_opt('l', av, &optarg))) {
3925 options->rename_limit = strtoul(optarg, NULL, 10);
3926 return argcount;
3927 }
3928 else if ((argcount = short_opt('S', av, &optarg))) {
3929 options->pickaxe = optarg;
3930 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3931 return argcount;
3932 } else if ((argcount = short_opt('G', av, &optarg))) {
3933 options->pickaxe = optarg;
3934 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3935 return argcount;
3936 }
3937 else if (!strcmp(arg, "--pickaxe-all"))
3938 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3939 else if (!strcmp(arg, "--pickaxe-regex"))
3940 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3941 else if ((argcount = short_opt('O', av, &optarg))) {
3942 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3943 options->orderfile = xstrdup(path);
3944 return argcount;
3945 }
3946 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3947 int offending = parse_diff_filter_opt(optarg, options);
3948 if (offending)
3949 die("unknown change class '%c' in --diff-filter=%s",
3950 offending, optarg);
3951 return argcount;
3952 }
3953 else if (!strcmp(arg, "--abbrev"))
3954 options->abbrev = DEFAULT_ABBREV;
3955 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3956 options->abbrev = strtoul(arg, NULL, 10);
3957 if (options->abbrev < MINIMUM_ABBREV)
3958 options->abbrev = MINIMUM_ABBREV;
3959 else if (40 < options->abbrev)
3960 options->abbrev = 40;
3961 }
3962 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3963 options->a_prefix = optarg;
3964 return argcount;
3965 }
3966 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3967 options->b_prefix = optarg;
3968 return argcount;
3969 }
3970 else if (!strcmp(arg, "--no-prefix"))
3971 options->a_prefix = options->b_prefix = "";
3972 else if (opt_arg(arg, '\0', "inter-hunk-context",
3973 &options->interhunkcontext))
3974 ;
3975 else if (!strcmp(arg, "-W"))
3976 DIFF_OPT_SET(options, FUNCCONTEXT);
3977 else if (!strcmp(arg, "--function-context"))
3978 DIFF_OPT_SET(options, FUNCCONTEXT);
3979 else if (!strcmp(arg, "--no-function-context"))
3980 DIFF_OPT_CLR(options, FUNCCONTEXT);
3981 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3982 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3983 options->file = fopen(path, "w");
3984 if (!options->file)
3985 die_errno("Could not open '%s'", path);
3986 options->close_file = 1;
3987 return argcount;
3988 } else
3989 return 0;
3990 return 1;
3991 }
3992
3993 int parse_rename_score(const char **cp_p)
3994 {
3995 unsigned long num, scale;
3996 int ch, dot;
3997 const char *cp = *cp_p;
3998
3999 num = 0;
4000 scale = 1;
4001 dot = 0;
4002 for (;;) {
4003 ch = *cp;
4004 if ( !dot && ch == '.' ) {
4005 scale = 1;
4006 dot = 1;
4007 } else if ( ch == '%' ) {
4008 scale = dot ? scale*100 : 100;
4009 cp++; /* % is always at the end */
4010 break;
4011 } else if ( ch >= '0' && ch <= '9' ) {
4012 if ( scale < 100000 ) {
4013 scale *= 10;
4014 num = (num*10) + (ch-'0');
4015 }
4016 } else {
4017 break;
4018 }
4019 cp++;
4020 }
4021 *cp_p = cp;
4022
4023 /* user says num divided by scale and we say internally that
4024 * is MAX_SCORE * num / scale.
4025 */
4026 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4027 }
4028
4029 static int diff_scoreopt_parse(const char *opt)
4030 {
4031 int opt1, opt2, cmd;
4032
4033 if (*opt++ != '-')
4034 return -1;
4035 cmd = *opt++;
4036 if (cmd == '-') {
4037 /* convert the long-form arguments into short-form versions */
4038 if (skip_prefix(opt, "break-rewrites", &opt)) {
4039 if (*opt == 0 || *opt++ == '=')
4040 cmd = 'B';
4041 } else if (skip_prefix(opt, "find-copies", &opt)) {
4042 if (*opt == 0 || *opt++ == '=')
4043 cmd = 'C';
4044 } else if (skip_prefix(opt, "find-renames", &opt)) {
4045 if (*opt == 0 || *opt++ == '=')
4046 cmd = 'M';
4047 }
4048 }
4049 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4050 return -1; /* that is not a -M, -C, or -B option */
4051
4052 opt1 = parse_rename_score(&opt);
4053 if (cmd != 'B')
4054 opt2 = 0;
4055 else {
4056 if (*opt == 0)
4057 opt2 = 0;
4058 else if (*opt != '/')
4059 return -1; /* we expect -B80/99 or -B80 */
4060 else {
4061 opt++;
4062 opt2 = parse_rename_score(&opt);
4063 }
4064 }
4065 if (*opt != 0)
4066 return -1;
4067 return opt1 | (opt2 << 16);
4068 }
4069
4070 struct diff_queue_struct diff_queued_diff;
4071
4072 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4073 {
4074 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4075 queue->queue[queue->nr++] = dp;
4076 }
4077
4078 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4079 struct diff_filespec *one,
4080 struct diff_filespec *two)
4081 {
4082 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4083 dp->one = one;
4084 dp->two = two;
4085 if (queue)
4086 diff_q(queue, dp);
4087 return dp;
4088 }
4089
4090 void diff_free_filepair(struct diff_filepair *p)
4091 {
4092 free_filespec(p->one);
4093 free_filespec(p->two);
4094 free(p);
4095 }
4096
4097 /* This is different from find_unique_abbrev() in that
4098 * it stuffs the result with dots for alignment.
4099 */
4100 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4101 {
4102 int abblen;
4103 const char *abbrev;
4104 if (len == 40)
4105 return sha1_to_hex(sha1);
4106
4107 abbrev = find_unique_abbrev(sha1, len);
4108 abblen = strlen(abbrev);
4109 if (abblen < 37) {
4110 static char hex[41];
4111 if (len < abblen && abblen <= len + 2)
4112 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4113 else
4114 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4115 return hex;
4116 }
4117 return sha1_to_hex(sha1);
4118 }
4119
4120 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4121 {
4122 int line_termination = opt->line_termination;
4123 int inter_name_termination = line_termination ? '\t' : '\0';
4124
4125 fprintf(opt->file, "%s", diff_line_prefix(opt));
4126 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4127 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4128 diff_unique_abbrev(p->one->sha1, opt->abbrev));
4129 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
4130 }
4131 if (p->score) {
4132 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4133 inter_name_termination);
4134 } else {
4135 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4136 }
4137
4138 if (p->status == DIFF_STATUS_COPIED ||
4139 p->status == DIFF_STATUS_RENAMED) {
4140 const char *name_a, *name_b;
4141 name_a = p->one->path;
4142 name_b = p->two->path;
4143 strip_prefix(opt->prefix_length, &name_a, &name_b);
4144 write_name_quoted(name_a, opt->file, inter_name_termination);
4145 write_name_quoted(name_b, opt->file, line_termination);
4146 } else {
4147 const char *name_a, *name_b;
4148 name_a = p->one->mode ? p->one->path : p->two->path;
4149 name_b = NULL;
4150 strip_prefix(opt->prefix_length, &name_a, &name_b);
4151 write_name_quoted(name_a, opt->file, line_termination);
4152 }
4153 }
4154
4155 int diff_unmodified_pair(struct diff_filepair *p)
4156 {
4157 /* This function is written stricter than necessary to support
4158 * the currently implemented transformers, but the idea is to
4159 * let transformers to produce diff_filepairs any way they want,
4160 * and filter and clean them up here before producing the output.
4161 */
4162 struct diff_filespec *one = p->one, *two = p->two;
4163
4164 if (DIFF_PAIR_UNMERGED(p))
4165 return 0; /* unmerged is interesting */
4166
4167 /* deletion, addition, mode or type change
4168 * and rename are all interesting.
4169 */
4170 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4171 DIFF_PAIR_MODE_CHANGED(p) ||
4172 strcmp(one->path, two->path))
4173 return 0;
4174
4175 /* both are valid and point at the same path. that is, we are
4176 * dealing with a change.
4177 */
4178 if (one->sha1_valid && two->sha1_valid &&
4179 !hashcmp(one->sha1, two->sha1) &&
4180 !one->dirty_submodule && !two->dirty_submodule)
4181 return 1; /* no change */
4182 if (!one->sha1_valid && !two->sha1_valid)
4183 return 1; /* both look at the same file on the filesystem. */
4184 return 0;
4185 }
4186
4187 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4188 {
4189 if (diff_unmodified_pair(p))
4190 return;
4191
4192 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4193 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4194 return; /* no tree diffs in patch format */
4195
4196 run_diff(p, o);
4197 }
4198
4199 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4200 struct diffstat_t *diffstat)
4201 {
4202 if (diff_unmodified_pair(p))
4203 return;
4204
4205 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4206 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4207 return; /* no useful stat for tree diffs */
4208
4209 run_diffstat(p, o, diffstat);
4210 }
4211
4212 static void diff_flush_checkdiff(struct diff_filepair *p,
4213 struct diff_options *o)
4214 {
4215 if (diff_unmodified_pair(p))
4216 return;
4217
4218 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4219 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4220 return; /* nothing to check in tree diffs */
4221
4222 run_checkdiff(p, o);
4223 }
4224
4225 int diff_queue_is_empty(void)
4226 {
4227 struct diff_queue_struct *q = &diff_queued_diff;
4228 int i;
4229 for (i = 0; i < q->nr; i++)
4230 if (!diff_unmodified_pair(q->queue[i]))
4231 return 0;
4232 return 1;
4233 }
4234
4235 #if DIFF_DEBUG
4236 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4237 {
4238 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4239 x, one ? one : "",
4240 s->path,
4241 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4242 s->mode,
4243 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
4244 fprintf(stderr, "queue[%d] %s size %lu\n",
4245 x, one ? one : "",
4246 s->size);
4247 }
4248
4249 void diff_debug_filepair(const struct diff_filepair *p, int i)
4250 {
4251 diff_debug_filespec(p->one, i, "one");
4252 diff_debug_filespec(p->two, i, "two");
4253 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4254 p->score, p->status ? p->status : '?',
4255 p->one->rename_used, p->broken_pair);
4256 }
4257
4258 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4259 {
4260 int i;
4261 if (msg)
4262 fprintf(stderr, "%s\n", msg);
4263 fprintf(stderr, "q->nr = %d\n", q->nr);
4264 for (i = 0; i < q->nr; i++) {
4265 struct diff_filepair *p = q->queue[i];
4266 diff_debug_filepair(p, i);
4267 }
4268 }
4269 #endif
4270
4271 static void diff_resolve_rename_copy(void)
4272 {
4273 int i;
4274 struct diff_filepair *p;
4275 struct diff_queue_struct *q = &diff_queued_diff;
4276
4277 diff_debug_queue("resolve-rename-copy", q);
4278
4279 for (i = 0; i < q->nr; i++) {
4280 p = q->queue[i];
4281 p->status = 0; /* undecided */
4282 if (DIFF_PAIR_UNMERGED(p))
4283 p->status = DIFF_STATUS_UNMERGED;
4284 else if (!DIFF_FILE_VALID(p->one))
4285 p->status = DIFF_STATUS_ADDED;
4286 else if (!DIFF_FILE_VALID(p->two))
4287 p->status = DIFF_STATUS_DELETED;
4288 else if (DIFF_PAIR_TYPE_CHANGED(p))
4289 p->status = DIFF_STATUS_TYPE_CHANGED;
4290
4291 /* from this point on, we are dealing with a pair
4292 * whose both sides are valid and of the same type, i.e.
4293 * either in-place edit or rename/copy edit.
4294 */
4295 else if (DIFF_PAIR_RENAME(p)) {
4296 /*
4297 * A rename might have re-connected a broken
4298 * pair up, causing the pathnames to be the
4299 * same again. If so, that's not a rename at
4300 * all, just a modification..
4301 *
4302 * Otherwise, see if this source was used for
4303 * multiple renames, in which case we decrement
4304 * the count, and call it a copy.
4305 */
4306 if (!strcmp(p->one->path, p->two->path))
4307 p->status = DIFF_STATUS_MODIFIED;
4308 else if (--p->one->rename_used > 0)
4309 p->status = DIFF_STATUS_COPIED;
4310 else
4311 p->status = DIFF_STATUS_RENAMED;
4312 }
4313 else if (hashcmp(p->one->sha1, p->two->sha1) ||
4314 p->one->mode != p->two->mode ||
4315 p->one->dirty_submodule ||
4316 p->two->dirty_submodule ||
4317 is_null_sha1(p->one->sha1))
4318 p->status = DIFF_STATUS_MODIFIED;
4319 else {
4320 /* This is a "no-change" entry and should not
4321 * happen anymore, but prepare for broken callers.
4322 */
4323 error("feeding unmodified %s to diffcore",
4324 p->one->path);
4325 p->status = DIFF_STATUS_UNKNOWN;
4326 }
4327 }
4328 diff_debug_queue("resolve-rename-copy done", q);
4329 }
4330
4331 static int check_pair_status(struct diff_filepair *p)
4332 {
4333 switch (p->status) {
4334 case DIFF_STATUS_UNKNOWN:
4335 return 0;
4336 case 0:
4337 die("internal error in diff-resolve-rename-copy");
4338 default:
4339 return 1;
4340 }
4341 }
4342
4343 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4344 {
4345 int fmt = opt->output_format;
4346
4347 if (fmt & DIFF_FORMAT_CHECKDIFF)
4348 diff_flush_checkdiff(p, opt);
4349 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4350 diff_flush_raw(p, opt);
4351 else if (fmt & DIFF_FORMAT_NAME) {
4352 const char *name_a, *name_b;
4353 name_a = p->two->path;
4354 name_b = NULL;
4355 strip_prefix(opt->prefix_length, &name_a, &name_b);
4356 write_name_quoted(name_a, opt->file, opt->line_termination);
4357 }
4358 }
4359
4360 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4361 {
4362 if (fs->mode)
4363 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4364 else
4365 fprintf(file, " %s ", newdelete);
4366 write_name_quoted(fs->path, file, '\n');
4367 }
4368
4369
4370 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4371 const char *line_prefix)
4372 {
4373 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4374 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4375 p->two->mode, show_name ? ' ' : '\n');
4376 if (show_name) {
4377 write_name_quoted(p->two->path, file, '\n');
4378 }
4379 }
4380 }
4381
4382 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4383 const char *line_prefix)
4384 {
4385 char *names = pprint_rename(p->one->path, p->two->path);
4386
4387 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4388 free(names);
4389 show_mode_change(file, p, 0, line_prefix);
4390 }
4391
4392 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4393 {
4394 FILE *file = opt->file;
4395 const char *line_prefix = diff_line_prefix(opt);
4396
4397 switch(p->status) {
4398 case DIFF_STATUS_DELETED:
4399 fputs(line_prefix, file);
4400 show_file_mode_name(file, "delete", p->one);
4401 break;
4402 case DIFF_STATUS_ADDED:
4403 fputs(line_prefix, file);
4404 show_file_mode_name(file, "create", p->two);
4405 break;
4406 case DIFF_STATUS_COPIED:
4407 fputs(line_prefix, file);
4408 show_rename_copy(file, "copy", p, line_prefix);
4409 break;
4410 case DIFF_STATUS_RENAMED:
4411 fputs(line_prefix, file);
4412 show_rename_copy(file, "rename", p, line_prefix);
4413 break;
4414 default:
4415 if (p->score) {
4416 fprintf(file, "%s rewrite ", line_prefix);
4417 write_name_quoted(p->two->path, file, ' ');
4418 fprintf(file, "(%d%%)\n", similarity_index(p));
4419 }
4420 show_mode_change(file, p, !p->score, line_prefix);
4421 break;
4422 }
4423 }
4424
4425 struct patch_id_t {
4426 git_SHA_CTX *ctx;
4427 int patchlen;
4428 };
4429
4430 static int remove_space(char *line, int len)
4431 {
4432 int i;
4433 char *dst = line;
4434 unsigned char c;
4435
4436 for (i = 0; i < len; i++)
4437 if (!isspace((c = line[i])))
4438 *dst++ = c;
4439
4440 return dst - line;
4441 }
4442
4443 static void patch_id_consume(void *priv, char *line, unsigned long len)
4444 {
4445 struct patch_id_t *data = priv;
4446 int new_len;
4447
4448 /* Ignore line numbers when computing the SHA1 of the patch */
4449 if (starts_with(line, "@@ -"))
4450 return;
4451
4452 new_len = remove_space(line, len);
4453
4454 git_SHA1_Update(data->ctx, line, new_len);
4455 data->patchlen += new_len;
4456 }
4457
4458 /* returns 0 upon success, and writes result into sha1 */
4459 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4460 {
4461 struct diff_queue_struct *q = &diff_queued_diff;
4462 int i;
4463 git_SHA_CTX ctx;
4464 struct patch_id_t data;
4465 char buffer[PATH_MAX * 4 + 20];
4466
4467 git_SHA1_Init(&ctx);
4468 memset(&data, 0, sizeof(struct patch_id_t));
4469 data.ctx = &ctx;
4470
4471 for (i = 0; i < q->nr; i++) {
4472 xpparam_t xpp;
4473 xdemitconf_t xecfg;
4474 mmfile_t mf1, mf2;
4475 struct diff_filepair *p = q->queue[i];
4476 int len1, len2;
4477
4478 memset(&xpp, 0, sizeof(xpp));
4479 memset(&xecfg, 0, sizeof(xecfg));
4480 if (p->status == 0)
4481 return error("internal diff status error");
4482 if (p->status == DIFF_STATUS_UNKNOWN)
4483 continue;
4484 if (diff_unmodified_pair(p))
4485 continue;
4486 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4487 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4488 continue;
4489 if (DIFF_PAIR_UNMERGED(p))
4490 continue;
4491
4492 diff_fill_sha1_info(p->one);
4493 diff_fill_sha1_info(p->two);
4494 if (fill_mmfile(&mf1, p->one) < 0 ||
4495 fill_mmfile(&mf2, p->two) < 0)
4496 return error("unable to read files to diff");
4497
4498 len1 = remove_space(p->one->path, strlen(p->one->path));
4499 len2 = remove_space(p->two->path, strlen(p->two->path));
4500 if (p->one->mode == 0)
4501 len1 = snprintf(buffer, sizeof(buffer),
4502 "diff--gita/%.*sb/%.*s"
4503 "newfilemode%06o"
4504 "---/dev/null"
4505 "+++b/%.*s",
4506 len1, p->one->path,
4507 len2, p->two->path,
4508 p->two->mode,
4509 len2, p->two->path);
4510 else if (p->two->mode == 0)
4511 len1 = snprintf(buffer, sizeof(buffer),
4512 "diff--gita/%.*sb/%.*s"
4513 "deletedfilemode%06o"
4514 "---a/%.*s"
4515 "+++/dev/null",
4516 len1, p->one->path,
4517 len2, p->two->path,
4518 p->one->mode,
4519 len1, p->one->path);
4520 else
4521 len1 = snprintf(buffer, sizeof(buffer),
4522 "diff--gita/%.*sb/%.*s"
4523 "---a/%.*s"
4524 "+++b/%.*s",
4525 len1, p->one->path,
4526 len2, p->two->path,
4527 len1, p->one->path,
4528 len2, p->two->path);
4529 git_SHA1_Update(&ctx, buffer, len1);
4530
4531 if (diff_filespec_is_binary(p->one) ||
4532 diff_filespec_is_binary(p->two)) {
4533 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4534 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4535 continue;
4536 }
4537
4538 xpp.flags = 0;
4539 xecfg.ctxlen = 3;
4540 xecfg.flags = 0;
4541 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4542 &xpp, &xecfg))
4543 return error("unable to generate patch-id diff for %s",
4544 p->one->path);
4545 }
4546
4547 git_SHA1_Final(sha1, &ctx);
4548 return 0;
4549 }
4550
4551 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4552 {
4553 struct diff_queue_struct *q = &diff_queued_diff;
4554 int i;
4555 int result = diff_get_patch_id(options, sha1);
4556
4557 for (i = 0; i < q->nr; i++)
4558 diff_free_filepair(q->queue[i]);
4559
4560 free(q->queue);
4561 DIFF_QUEUE_CLEAR(q);
4562
4563 return result;
4564 }
4565
4566 static int is_summary_empty(const struct diff_queue_struct *q)
4567 {
4568 int i;
4569
4570 for (i = 0; i < q->nr; i++) {
4571 const struct diff_filepair *p = q->queue[i];
4572
4573 switch (p->status) {
4574 case DIFF_STATUS_DELETED:
4575 case DIFF_STATUS_ADDED:
4576 case DIFF_STATUS_COPIED:
4577 case DIFF_STATUS_RENAMED:
4578 return 0;
4579 default:
4580 if (p->score)
4581 return 0;
4582 if (p->one->mode && p->two->mode &&
4583 p->one->mode != p->two->mode)
4584 return 0;
4585 break;
4586 }
4587 }
4588 return 1;
4589 }
4590
4591 static const char rename_limit_warning[] =
4592 "inexact rename detection was skipped due to too many files.";
4593
4594 static const char degrade_cc_to_c_warning[] =
4595 "only found copies from modified paths due to too many files.";
4596
4597 static const char rename_limit_advice[] =
4598 "you may want to set your %s variable to at least "
4599 "%d and retry the command.";
4600
4601 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4602 {
4603 if (degraded_cc)
4604 warning(degrade_cc_to_c_warning);
4605 else if (needed)
4606 warning(rename_limit_warning);
4607 else
4608 return;
4609 if (0 < needed && needed < 32767)
4610 warning(rename_limit_advice, varname, needed);
4611 }
4612
4613 void diff_flush(struct diff_options *options)
4614 {
4615 struct diff_queue_struct *q = &diff_queued_diff;
4616 int i, output_format = options->output_format;
4617 int separator = 0;
4618 int dirstat_by_line = 0;
4619
4620 /*
4621 * Order: raw, stat, summary, patch
4622 * or: name/name-status/checkdiff (other bits clear)
4623 */
4624 if (!q->nr)
4625 goto free_queue;
4626
4627 if (output_format & (DIFF_FORMAT_RAW |
4628 DIFF_FORMAT_NAME |
4629 DIFF_FORMAT_NAME_STATUS |
4630 DIFF_FORMAT_CHECKDIFF)) {
4631 for (i = 0; i < q->nr; i++) {
4632 struct diff_filepair *p = q->queue[i];
4633 if (check_pair_status(p))
4634 flush_one_pair(p, options);
4635 }
4636 separator++;
4637 }
4638
4639 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4640 dirstat_by_line = 1;
4641
4642 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4643 dirstat_by_line) {
4644 struct diffstat_t diffstat;
4645
4646 memset(&diffstat, 0, sizeof(struct diffstat_t));
4647 for (i = 0; i < q->nr; i++) {
4648 struct diff_filepair *p = q->queue[i];
4649 if (check_pair_status(p))
4650 diff_flush_stat(p, options, &diffstat);
4651 }
4652 if (output_format & DIFF_FORMAT_NUMSTAT)
4653 show_numstat(&diffstat, options);
4654 if (output_format & DIFF_FORMAT_DIFFSTAT)
4655 show_stats(&diffstat, options);
4656 if (output_format & DIFF_FORMAT_SHORTSTAT)
4657 show_shortstats(&diffstat, options);
4658 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4659 show_dirstat_by_line(&diffstat, options);
4660 free_diffstat_info(&diffstat);
4661 separator++;
4662 }
4663 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4664 show_dirstat(options);
4665
4666 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4667 for (i = 0; i < q->nr; i++) {
4668 diff_summary(options, q->queue[i]);
4669 }
4670 separator++;
4671 }
4672
4673 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4674 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4675 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4676 /*
4677 * run diff_flush_patch for the exit status. setting
4678 * options->file to /dev/null should be safe, because we
4679 * aren't supposed to produce any output anyway.
4680 */
4681 if (options->close_file)
4682 fclose(options->file);
4683 options->file = fopen("/dev/null", "w");
4684 if (!options->file)
4685 die_errno("Could not open /dev/null");
4686 options->close_file = 1;
4687 for (i = 0; i < q->nr; i++) {
4688 struct diff_filepair *p = q->queue[i];
4689 if (check_pair_status(p))
4690 diff_flush_patch(p, options);
4691 if (options->found_changes)
4692 break;
4693 }
4694 }
4695
4696 if (output_format & DIFF_FORMAT_PATCH) {
4697 if (separator) {
4698 fprintf(options->file, "%s%c",
4699 diff_line_prefix(options),
4700 options->line_termination);
4701 if (options->stat_sep) {
4702 /* attach patch instead of inline */
4703 fputs(options->stat_sep, options->file);
4704 }
4705 }
4706
4707 for (i = 0; i < q->nr; i++) {
4708 struct diff_filepair *p = q->queue[i];
4709 if (check_pair_status(p))
4710 diff_flush_patch(p, options);
4711 }
4712 }
4713
4714 if (output_format & DIFF_FORMAT_CALLBACK)
4715 options->format_callback(q, options, options->format_callback_data);
4716
4717 for (i = 0; i < q->nr; i++)
4718 diff_free_filepair(q->queue[i]);
4719 free_queue:
4720 free(q->queue);
4721 DIFF_QUEUE_CLEAR(q);
4722 if (options->close_file)
4723 fclose(options->file);
4724
4725 /*
4726 * Report the content-level differences with HAS_CHANGES;
4727 * diff_addremove/diff_change does not set the bit when
4728 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4729 */
4730 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4731 if (options->found_changes)
4732 DIFF_OPT_SET(options, HAS_CHANGES);
4733 else
4734 DIFF_OPT_CLR(options, HAS_CHANGES);
4735 }
4736 }
4737
4738 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4739 {
4740 return (((p->status == DIFF_STATUS_MODIFIED) &&
4741 ((p->score &&
4742 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4743 (!p->score &&
4744 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4745 ((p->status != DIFF_STATUS_MODIFIED) &&
4746 filter_bit_tst(p->status, options)));
4747 }
4748
4749 static void diffcore_apply_filter(struct diff_options *options)
4750 {
4751 int i;
4752 struct diff_queue_struct *q = &diff_queued_diff;
4753 struct diff_queue_struct outq;
4754
4755 DIFF_QUEUE_CLEAR(&outq);
4756
4757 if (!options->filter)
4758 return;
4759
4760 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4761 int found;
4762 for (i = found = 0; !found && i < q->nr; i++) {
4763 if (match_filter(options, q->queue[i]))
4764 found++;
4765 }
4766 if (found)
4767 return;
4768
4769 /* otherwise we will clear the whole queue
4770 * by copying the empty outq at the end of this
4771 * function, but first clear the current entries
4772 * in the queue.
4773 */
4774 for (i = 0; i < q->nr; i++)
4775 diff_free_filepair(q->queue[i]);
4776 }
4777 else {
4778 /* Only the matching ones */
4779 for (i = 0; i < q->nr; i++) {
4780 struct diff_filepair *p = q->queue[i];
4781 if (match_filter(options, p))
4782 diff_q(&outq, p);
4783 else
4784 diff_free_filepair(p);
4785 }
4786 }
4787 free(q->queue);
4788 *q = outq;
4789 }
4790
4791 /* Check whether two filespecs with the same mode and size are identical */
4792 static int diff_filespec_is_identical(struct diff_filespec *one,
4793 struct diff_filespec *two)
4794 {
4795 if (S_ISGITLINK(one->mode))
4796 return 0;
4797 if (diff_populate_filespec(one, 0))
4798 return 0;
4799 if (diff_populate_filespec(two, 0))
4800 return 0;
4801 return !memcmp(one->data, two->data, one->size);
4802 }
4803
4804 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4805 {
4806 if (p->done_skip_stat_unmatch)
4807 return p->skip_stat_unmatch_result;
4808
4809 p->done_skip_stat_unmatch = 1;
4810 p->skip_stat_unmatch_result = 0;
4811 /*
4812 * 1. Entries that come from stat info dirtiness
4813 * always have both sides (iow, not create/delete),
4814 * one side of the object name is unknown, with
4815 * the same mode and size. Keep the ones that
4816 * do not match these criteria. They have real
4817 * differences.
4818 *
4819 * 2. At this point, the file is known to be modified,
4820 * with the same mode and size, and the object
4821 * name of one side is unknown. Need to inspect
4822 * the identical contents.
4823 */
4824 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4825 !DIFF_FILE_VALID(p->two) ||
4826 (p->one->sha1_valid && p->two->sha1_valid) ||
4827 (p->one->mode != p->two->mode) ||
4828 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4829 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4830 (p->one->size != p->two->size) ||
4831 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4832 p->skip_stat_unmatch_result = 1;
4833 return p->skip_stat_unmatch_result;
4834 }
4835
4836 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4837 {
4838 int i;
4839 struct diff_queue_struct *q = &diff_queued_diff;
4840 struct diff_queue_struct outq;
4841 DIFF_QUEUE_CLEAR(&outq);
4842
4843 for (i = 0; i < q->nr; i++) {
4844 struct diff_filepair *p = q->queue[i];
4845
4846 if (diff_filespec_check_stat_unmatch(p))
4847 diff_q(&outq, p);
4848 else {
4849 /*
4850 * The caller can subtract 1 from skip_stat_unmatch
4851 * to determine how many paths were dirty only
4852 * due to stat info mismatch.
4853 */
4854 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4855 diffopt->skip_stat_unmatch++;
4856 diff_free_filepair(p);
4857 }
4858 }
4859 free(q->queue);
4860 *q = outq;
4861 }
4862
4863 static int diffnamecmp(const void *a_, const void *b_)
4864 {
4865 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4866 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4867 const char *name_a, *name_b;
4868
4869 name_a = a->one ? a->one->path : a->two->path;
4870 name_b = b->one ? b->one->path : b->two->path;
4871 return strcmp(name_a, name_b);
4872 }
4873
4874 void diffcore_fix_diff_index(struct diff_options *options)
4875 {
4876 struct diff_queue_struct *q = &diff_queued_diff;
4877 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4878 }
4879
4880 void diffcore_std(struct diff_options *options)
4881 {
4882 /* NOTE please keep the following in sync with diff_tree_combined() */
4883 if (options->skip_stat_unmatch)
4884 diffcore_skip_stat_unmatch(options);
4885 if (!options->found_follow) {
4886 /* See try_to_follow_renames() in tree-diff.c */
4887 if (options->break_opt != -1)
4888 diffcore_break(options->break_opt);
4889 if (options->detect_rename)
4890 diffcore_rename(options);
4891 if (options->break_opt != -1)
4892 diffcore_merge_broken();
4893 }
4894 if (options->pickaxe)
4895 diffcore_pickaxe(options);
4896 if (options->orderfile)
4897 diffcore_order(options->orderfile);
4898 if (!options->found_follow)
4899 /* See try_to_follow_renames() in tree-diff.c */
4900 diff_resolve_rename_copy();
4901 diffcore_apply_filter(options);
4902
4903 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4904 DIFF_OPT_SET(options, HAS_CHANGES);
4905 else
4906 DIFF_OPT_CLR(options, HAS_CHANGES);
4907
4908 options->found_follow = 0;
4909 }
4910
4911 int diff_result_code(struct diff_options *opt, int status)
4912 {
4913 int result = 0;
4914
4915 diff_warn_rename_limit("diff.renameLimit",
4916 opt->needed_rename_limit,
4917 opt->degraded_cc_to_c);
4918 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4919 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4920 return status;
4921 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4922 DIFF_OPT_TST(opt, HAS_CHANGES))
4923 result |= 01;
4924 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4925 DIFF_OPT_TST(opt, CHECK_FAILED))
4926 result |= 02;
4927 return result;
4928 }
4929
4930 int diff_can_quit_early(struct diff_options *opt)
4931 {
4932 return (DIFF_OPT_TST(opt, QUICK) &&
4933 !opt->filter &&
4934 DIFF_OPT_TST(opt, HAS_CHANGES));
4935 }
4936
4937 /*
4938 * Shall changes to this submodule be ignored?
4939 *
4940 * Submodule changes can be configured to be ignored separately for each path,
4941 * but that configuration can be overridden from the command line.
4942 */
4943 static int is_submodule_ignored(const char *path, struct diff_options *options)
4944 {
4945 int ignored = 0;
4946 unsigned orig_flags = options->flags;
4947 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4948 set_diffopt_flags_from_submodule_config(options, path);
4949 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4950 ignored = 1;
4951 options->flags = orig_flags;
4952 return ignored;
4953 }
4954
4955 void diff_addremove(struct diff_options *options,
4956 int addremove, unsigned mode,
4957 const unsigned char *sha1,
4958 int sha1_valid,
4959 const char *concatpath, unsigned dirty_submodule)
4960 {
4961 struct diff_filespec *one, *two;
4962
4963 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4964 return;
4965
4966 /* This may look odd, but it is a preparation for
4967 * feeding "there are unchanged files which should
4968 * not produce diffs, but when you are doing copy
4969 * detection you would need them, so here they are"
4970 * entries to the diff-core. They will be prefixed
4971 * with something like '=' or '*' (I haven't decided
4972 * which but should not make any difference).
4973 * Feeding the same new and old to diff_change()
4974 * also has the same effect.
4975 * Before the final output happens, they are pruned after
4976 * merged into rename/copy pairs as appropriate.
4977 */
4978 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4979 addremove = (addremove == '+' ? '-' :
4980 addremove == '-' ? '+' : addremove);
4981
4982 if (options->prefix &&
4983 strncmp(concatpath, options->prefix, options->prefix_length))
4984 return;
4985
4986 one = alloc_filespec(concatpath);
4987 two = alloc_filespec(concatpath);
4988
4989 if (addremove != '+')
4990 fill_filespec(one, sha1, sha1_valid, mode);
4991 if (addremove != '-') {
4992 fill_filespec(two, sha1, sha1_valid, mode);
4993 two->dirty_submodule = dirty_submodule;
4994 }
4995
4996 diff_queue(&diff_queued_diff, one, two);
4997 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4998 DIFF_OPT_SET(options, HAS_CHANGES);
4999 }
5000
5001 void diff_change(struct diff_options *options,
5002 unsigned old_mode, unsigned new_mode,
5003 const unsigned char *old_sha1,
5004 const unsigned char *new_sha1,
5005 int old_sha1_valid, int new_sha1_valid,
5006 const char *concatpath,
5007 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5008 {
5009 struct diff_filespec *one, *two;
5010 struct diff_filepair *p;
5011
5012 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5013 is_submodule_ignored(concatpath, options))
5014 return;
5015
5016 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5017 unsigned tmp;
5018 const unsigned char *tmp_c;
5019 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
5020 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
5021 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
5022 new_sha1_valid = tmp;
5023 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
5024 new_dirty_submodule = tmp;
5025 }
5026
5027 if (options->prefix &&
5028 strncmp(concatpath, options->prefix, options->prefix_length))
5029 return;
5030
5031 one = alloc_filespec(concatpath);
5032 two = alloc_filespec(concatpath);
5033 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5034 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5035 one->dirty_submodule = old_dirty_submodule;
5036 two->dirty_submodule = new_dirty_submodule;
5037 p = diff_queue(&diff_queued_diff, one, two);
5038
5039 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5040 return;
5041
5042 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5043 !diff_filespec_check_stat_unmatch(p))
5044 return;
5045
5046 DIFF_OPT_SET(options, HAS_CHANGES);
5047 }
5048
5049 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5050 {
5051 struct diff_filepair *pair;
5052 struct diff_filespec *one, *two;
5053
5054 if (options->prefix &&
5055 strncmp(path, options->prefix, options->prefix_length))
5056 return NULL;
5057
5058 one = alloc_filespec(path);
5059 two = alloc_filespec(path);
5060 pair = diff_queue(&diff_queued_diff, one, two);
5061 pair->is_unmerged = 1;
5062 return pair;
5063 }
5064
5065 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5066 size_t *outsize)
5067 {
5068 struct diff_tempfile *temp;
5069 const char *argv[3];
5070 const char **arg = argv;
5071 struct child_process child = CHILD_PROCESS_INIT;
5072 struct strbuf buf = STRBUF_INIT;
5073 int err = 0;
5074
5075 temp = prepare_temp_file(spec->path, spec);
5076 *arg++ = pgm;
5077 *arg++ = temp->name;
5078 *arg = NULL;
5079
5080 child.use_shell = 1;
5081 child.argv = argv;
5082 child.out = -1;
5083 if (start_command(&child)) {
5084 remove_tempfile();
5085 return NULL;
5086 }
5087
5088 if (strbuf_read(&buf, child.out, 0) < 0)
5089 err = error("error reading from textconv command '%s'", pgm);
5090 close(child.out);
5091
5092 if (finish_command(&child) || err) {
5093 strbuf_release(&buf);
5094 remove_tempfile();
5095 return NULL;
5096 }
5097 remove_tempfile();
5098
5099 return strbuf_detach(&buf, outsize);
5100 }
5101
5102 size_t fill_textconv(struct userdiff_driver *driver,
5103 struct diff_filespec *df,
5104 char **outbuf)
5105 {
5106 size_t size;
5107
5108 if (!driver) {
5109 if (!DIFF_FILE_VALID(df)) {
5110 *outbuf = "";
5111 return 0;
5112 }
5113 if (diff_populate_filespec(df, 0))
5114 die("unable to read files to diff");
5115 *outbuf = df->data;
5116 return df->size;
5117 }
5118
5119 if (!driver->textconv)
5120 die("BUG: fill_textconv called with non-textconv driver");
5121
5122 if (driver->textconv_cache && df->sha1_valid) {
5123 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
5124 &size);
5125 if (*outbuf)
5126 return size;
5127 }
5128
5129 *outbuf = run_textconv(driver->textconv, df, &size);
5130 if (!*outbuf)
5131 die("unable to read files to diff");
5132
5133 if (driver->textconv_cache && df->sha1_valid) {
5134 /* ignore errors, as we might be in a readonly repository */
5135 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
5136 size);
5137 /*
5138 * we could save up changes and flush them all at the end,
5139 * but we would need an extra call after all diffing is done.
5140 * Since generating a cache entry is the slow path anyway,
5141 * this extra overhead probably isn't a big deal.
5142 */
5143 notes_cache_write(driver->textconv_cache);
5144 }
5145
5146 return size;
5147 }
5148
5149 void setup_diff_pager(struct diff_options *opt)
5150 {
5151 /*
5152 * If the user asked for our exit code, then either they want --quiet
5153 * or --exit-code. We should definitely not bother with a pager in the
5154 * former case, as we will generate no output. Since we still properly
5155 * report our exit code even when a pager is run, we _could_ run a
5156 * pager with --exit-code. But since we have not done so historically,
5157 * and because it is easy to find people oneline advising "git diff
5158 * --exit-code" in hooks and other scripts, we do not do so.
5159 */
5160 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5161 check_pager_config("diff") != 0)
5162 setup_pager();
5163 }
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