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Merge branch 'rs/checkout-some-states-are-const' into maint
[alt-git.git] / diff.c
blobcc8e81290ab67d14b1c0f63ccd6c6b2e6a0e8b0c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "tempfile.h"
6 #include "quote.h"
7 #include "diff.h"
8 #include "diffcore.h"
9 #include "delta.h"
10 #include "xdiff-interface.h"
11 #include "color.h"
12 #include "attr.h"
13 #include "run-command.h"
14 #include "utf8.h"
15 #include "userdiff.h"
16 #include "submodule-config.h"
17 #include "submodule.h"
18 #include "ll-merge.h"
19 #include "string-list.h"
20 #include "argv-array.h"
21
22 #ifdef NO_FAST_WORKING_DIRECTORY
23 #define FAST_WORKING_DIRECTORY 0
24 #else
25 #define FAST_WORKING_DIRECTORY 1
26 #endif
27
28 static int diff_detect_rename_default;
29 static int diff_compaction_heuristic; /* experimental */
30 static int diff_rename_limit_default = 400;
31 static int diff_suppress_blank_empty;
32 static int diff_use_color_default = -1;
33 static int diff_context_default = 3;
34 static const char *diff_word_regex_cfg;
35 static const char *external_diff_cmd_cfg;
36 static const char *diff_order_file_cfg;
37 int diff_auto_refresh_index = 1;
38 static int diff_mnemonic_prefix;
39 static int diff_no_prefix;
40 static int diff_stat_graph_width;
41 static int diff_dirstat_permille_default = 30;
42 static struct diff_options default_diff_options;
43 static long diff_algorithm;
44
45 static char diff_colors[][COLOR_MAXLEN] = {
46 GIT_COLOR_RESET,
47 GIT_COLOR_NORMAL, /* CONTEXT */
48 GIT_COLOR_BOLD, /* METAINFO */
49 GIT_COLOR_CYAN, /* FRAGINFO */
50 GIT_COLOR_RED, /* OLD */
51 GIT_COLOR_GREEN, /* NEW */
52 GIT_COLOR_YELLOW, /* COMMIT */
53 GIT_COLOR_BG_RED, /* WHITESPACE */
54 GIT_COLOR_NORMAL, /* FUNCINFO */
55 };
56
57 static int parse_diff_color_slot(const char *var)
58 {
59 if (!strcasecmp(var, "context") || !strcasecmp(var, "plain"))
60 return DIFF_CONTEXT;
61 if (!strcasecmp(var, "meta"))
62 return DIFF_METAINFO;
63 if (!strcasecmp(var, "frag"))
64 return DIFF_FRAGINFO;
65 if (!strcasecmp(var, "old"))
66 return DIFF_FILE_OLD;
67 if (!strcasecmp(var, "new"))
68 return DIFF_FILE_NEW;
69 if (!strcasecmp(var, "commit"))
70 return DIFF_COMMIT;
71 if (!strcasecmp(var, "whitespace"))
72 return DIFF_WHITESPACE;
73 if (!strcasecmp(var, "func"))
74 return DIFF_FUNCINFO;
75 return -1;
76 }
77
78 static int parse_dirstat_params(struct diff_options *options, const char *params_string,
79 struct strbuf *errmsg)
80 {
81 char *params_copy = xstrdup(params_string);
82 struct string_list params = STRING_LIST_INIT_NODUP;
83 int ret = 0;
84 int i;
85
86 if (*params_copy)
87 string_list_split_in_place(&params, params_copy, ',', -1);
88 for (i = 0; i < params.nr; i++) {
89 const char *p = params.items[i].string;
90 if (!strcmp(p, "changes")) {
91 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
92 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
93 } else if (!strcmp(p, "lines")) {
94 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
95 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
96 } else if (!strcmp(p, "files")) {
97 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
98 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
99 } else if (!strcmp(p, "noncumulative")) {
100 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
101 } else if (!strcmp(p, "cumulative")) {
102 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
103 } else if (isdigit(*p)) {
104 char *end;
105 int permille = strtoul(p, &end, 10) * 10;
106 if (*end == '.' && isdigit(*++end)) {
107 /* only use first digit */
108 permille += *end - '0';
109 /* .. and ignore any further digits */
110 while (isdigit(*++end))
111 ; /* nothing */
112 }
113 if (!*end)
114 options->dirstat_permille = permille;
115 else {
116 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%s'\n"),
117 p);
118 ret++;
119 }
120 } else {
121 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%s'\n"), p);
122 ret++;
123 }
124
125 }
126 string_list_clear(&params, 0);
127 free(params_copy);
128 return ret;
129 }
130
131 static int parse_submodule_params(struct diff_options *options, const char *value)
132 {
133 if (!strcmp(value, "log"))
134 DIFF_OPT_SET(options, SUBMODULE_LOG);
135 else if (!strcmp(value, "short"))
136 DIFF_OPT_CLR(options, SUBMODULE_LOG);
137 else
138 return -1;
139 return 0;
140 }
141
142 static int git_config_rename(const char *var, const char *value)
143 {
144 if (!value)
145 return DIFF_DETECT_RENAME;
146 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
147 return DIFF_DETECT_COPY;
148 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
149 }
150
151 long parse_algorithm_value(const char *value)
152 {
153 if (!value)
154 return -1;
155 else if (!strcasecmp(value, "myers") || !strcasecmp(value, "default"))
156 return 0;
157 else if (!strcasecmp(value, "minimal"))
158 return XDF_NEED_MINIMAL;
159 else if (!strcasecmp(value, "patience"))
160 return XDF_PATIENCE_DIFF;
161 else if (!strcasecmp(value, "histogram"))
162 return XDF_HISTOGRAM_DIFF;
163 return -1;
164 }
165
166 /*
167 * These are to give UI layer defaults.
168 * The core-level commands such as git-diff-files should
169 * never be affected by the setting of diff.renames
170 * the user happens to have in the configuration file.
171 */
172 void init_diff_ui_defaults(void)
173 {
174 diff_detect_rename_default = 1;
175 }
176
177 int git_diff_ui_config(const char *var, const char *value, void *cb)
178 {
179 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
180 diff_use_color_default = git_config_colorbool(var, value);
181 return 0;
182 }
183 if (!strcmp(var, "diff.context")) {
184 diff_context_default = git_config_int(var, value);
185 if (diff_context_default < 0)
186 return -1;
187 return 0;
188 }
189 if (!strcmp(var, "diff.renames")) {
190 diff_detect_rename_default = git_config_rename(var, value);
191 return 0;
192 }
193 if (!strcmp(var, "diff.compactionheuristic")) {
194 diff_compaction_heuristic = git_config_bool(var, value);
195 return 0;
196 }
197 if (!strcmp(var, "diff.autorefreshindex")) {
198 diff_auto_refresh_index = git_config_bool(var, value);
199 return 0;
200 }
201 if (!strcmp(var, "diff.mnemonicprefix")) {
202 diff_mnemonic_prefix = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp(var, "diff.noprefix")) {
206 diff_no_prefix = git_config_bool(var, value);
207 return 0;
208 }
209 if (!strcmp(var, "diff.statgraphwidth")) {
210 diff_stat_graph_width = git_config_int(var, value);
211 return 0;
212 }
213 if (!strcmp(var, "diff.external"))
214 return git_config_string(&external_diff_cmd_cfg, var, value);
215 if (!strcmp(var, "diff.wordregex"))
216 return git_config_string(&diff_word_regex_cfg, var, value);
217 if (!strcmp(var, "diff.orderfile"))
218 return git_config_pathname(&diff_order_file_cfg, var, value);
219
220 if (!strcmp(var, "diff.ignoresubmodules"))
221 handle_ignore_submodules_arg(&default_diff_options, value);
222
223 if (!strcmp(var, "diff.submodule")) {
224 if (parse_submodule_params(&default_diff_options, value))
225 warning(_("Unknown value for 'diff.submodule' config variable: '%s'"),
226 value);
227 return 0;
228 }
229
230 if (!strcmp(var, "diff.algorithm")) {
231 diff_algorithm = parse_algorithm_value(value);
232 if (diff_algorithm < 0)
233 return -1;
234 return 0;
235 }
236
237 if (git_color_config(var, value, cb) < 0)
238 return -1;
239
240 return git_diff_basic_config(var, value, cb);
241 }
242
243 int git_diff_basic_config(const char *var, const char *value, void *cb)
244 {
245 const char *name;
246
247 if (!strcmp(var, "diff.renamelimit")) {
248 diff_rename_limit_default = git_config_int(var, value);
249 return 0;
250 }
251
252 if (userdiff_config(var, value) < 0)
253 return -1;
254
255 if (skip_prefix(var, "diff.color.", &name) ||
256 skip_prefix(var, "color.diff.", &name)) {
257 int slot = parse_diff_color_slot(name);
258 if (slot < 0)
259 return 0;
260 if (!value)
261 return config_error_nonbool(var);
262 return color_parse(value, diff_colors[slot]);
263 }
264
265 /* like GNU diff's --suppress-blank-empty option */
266 if (!strcmp(var, "diff.suppressblankempty") ||
267 /* for backwards compatibility */
268 !strcmp(var, "diff.suppress-blank-empty")) {
269 diff_suppress_blank_empty = git_config_bool(var, value);
270 return 0;
271 }
272
273 if (!strcmp(var, "diff.dirstat")) {
274 struct strbuf errmsg = STRBUF_INIT;
275 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
276 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
277 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
278 errmsg.buf);
279 strbuf_release(&errmsg);
280 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
281 return 0;
282 }
283
284 if (starts_with(var, "submodule."))
285 return parse_submodule_config_option(var, value);
286
287 return git_default_config(var, value, cb);
288 }
289
290 static char *quote_two(const char *one, const char *two)
291 {
292 int need_one = quote_c_style(one, NULL, NULL, 1);
293 int need_two = quote_c_style(two, NULL, NULL, 1);
294 struct strbuf res = STRBUF_INIT;
295
296 if (need_one + need_two) {
297 strbuf_addch(&res, '"');
298 quote_c_style(one, &res, NULL, 1);
299 quote_c_style(two, &res, NULL, 1);
300 strbuf_addch(&res, '"');
301 } else {
302 strbuf_addstr(&res, one);
303 strbuf_addstr(&res, two);
304 }
305 return strbuf_detach(&res, NULL);
306 }
307
308 static const char *external_diff(void)
309 {
310 static const char *external_diff_cmd = NULL;
311 static int done_preparing = 0;
312
313 if (done_preparing)
314 return external_diff_cmd;
315 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
316 if (!external_diff_cmd)
317 external_diff_cmd = external_diff_cmd_cfg;
318 done_preparing = 1;
319 return external_diff_cmd;
320 }
321
322 /*
323 * Keep track of files used for diffing. Sometimes such an entry
324 * refers to a temporary file, sometimes to an existing file, and
325 * sometimes to "/dev/null".
326 */
327 static struct diff_tempfile {
328 /*
329 * filename external diff should read from, or NULL if this
330 * entry is currently not in use:
331 */
332 const char *name;
333
334 char hex[GIT_SHA1_HEXSZ + 1];
335 char mode[10];
336
337 /*
338 * If this diff_tempfile instance refers to a temporary file,
339 * this tempfile object is used to manage its lifetime.
340 */
341 struct tempfile tempfile;
342 } diff_temp[2];
343
344 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
345
346 struct emit_callback {
347 int color_diff;
348 unsigned ws_rule;
349 int blank_at_eof_in_preimage;
350 int blank_at_eof_in_postimage;
351 int lno_in_preimage;
352 int lno_in_postimage;
353 sane_truncate_fn truncate;
354 const char **label_path;
355 struct diff_words_data *diff_words;
356 struct diff_options *opt;
357 struct strbuf *header;
358 };
359
360 static int count_lines(const char *data, int size)
361 {
362 int count, ch, completely_empty = 1, nl_just_seen = 0;
363 count = 0;
364 while (0 < size--) {
365 ch = *data++;
366 if (ch == '\n') {
367 count++;
368 nl_just_seen = 1;
369 completely_empty = 0;
370 }
371 else {
372 nl_just_seen = 0;
373 completely_empty = 0;
374 }
375 }
376 if (completely_empty)
377 return 0;
378 if (!nl_just_seen)
379 count++; /* no trailing newline */
380 return count;
381 }
382
383 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
384 {
385 if (!DIFF_FILE_VALID(one)) {
386 mf->ptr = (char *)""; /* does not matter */
387 mf->size = 0;
388 return 0;
389 }
390 else if (diff_populate_filespec(one, 0))
391 return -1;
392
393 mf->ptr = one->data;
394 mf->size = one->size;
395 return 0;
396 }
397
398 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
399 static unsigned long diff_filespec_size(struct diff_filespec *one)
400 {
401 if (!DIFF_FILE_VALID(one))
402 return 0;
403 diff_populate_filespec(one, CHECK_SIZE_ONLY);
404 return one->size;
405 }
406
407 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
408 {
409 char *ptr = mf->ptr;
410 long size = mf->size;
411 int cnt = 0;
412
413 if (!size)
414 return cnt;
415 ptr += size - 1; /* pointing at the very end */
416 if (*ptr != '\n')
417 ; /* incomplete line */
418 else
419 ptr--; /* skip the last LF */
420 while (mf->ptr < ptr) {
421 char *prev_eol;
422 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
423 if (*prev_eol == '\n')
424 break;
425 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
426 break;
427 cnt++;
428 ptr = prev_eol - 1;
429 }
430 return cnt;
431 }
432
433 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
434 struct emit_callback *ecbdata)
435 {
436 int l1, l2, at;
437 unsigned ws_rule = ecbdata->ws_rule;
438 l1 = count_trailing_blank(mf1, ws_rule);
439 l2 = count_trailing_blank(mf2, ws_rule);
440 if (l2 <= l1) {
441 ecbdata->blank_at_eof_in_preimage = 0;
442 ecbdata->blank_at_eof_in_postimage = 0;
443 return;
444 }
445 at = count_lines(mf1->ptr, mf1->size);
446 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
447
448 at = count_lines(mf2->ptr, mf2->size);
449 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
450 }
451
452 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
453 int first, const char *line, int len)
454 {
455 int has_trailing_newline, has_trailing_carriage_return;
456 int nofirst;
457 FILE *file = o->file;
458
459 fputs(diff_line_prefix(o), file);
460
461 if (len == 0) {
462 has_trailing_newline = (first == '\n');
463 has_trailing_carriage_return = (!has_trailing_newline &&
464 (first == '\r'));
465 nofirst = has_trailing_newline || has_trailing_carriage_return;
466 } else {
467 has_trailing_newline = (len > 0 && line[len-1] == '\n');
468 if (has_trailing_newline)
469 len--;
470 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
471 if (has_trailing_carriage_return)
472 len--;
473 nofirst = 0;
474 }
475
476 if (len || !nofirst) {
477 fputs(set, file);
478 if (!nofirst)
479 fputc(first, file);
480 fwrite(line, len, 1, file);
481 fputs(reset, file);
482 }
483 if (has_trailing_carriage_return)
484 fputc('\r', file);
485 if (has_trailing_newline)
486 fputc('\n', file);
487 }
488
489 static void emit_line(struct diff_options *o, const char *set, const char *reset,
490 const char *line, int len)
491 {
492 emit_line_0(o, set, reset, line[0], line+1, len-1);
493 }
494
495 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
496 {
497 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
498 ecbdata->blank_at_eof_in_preimage &&
499 ecbdata->blank_at_eof_in_postimage &&
500 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
501 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
502 return 0;
503 return ws_blank_line(line, len, ecbdata->ws_rule);
504 }
505
506 static void emit_line_checked(const char *reset,
507 struct emit_callback *ecbdata,
508 const char *line, int len,
509 enum color_diff color,
510 unsigned ws_error_highlight,
511 char sign)
512 {
513 const char *set = diff_get_color(ecbdata->color_diff, color);
514 const char *ws = NULL;
515
516 if (ecbdata->opt->ws_error_highlight & ws_error_highlight) {
517 ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
518 if (!*ws)
519 ws = NULL;
520 }
521
522 if (!ws)
523 emit_line_0(ecbdata->opt, set, reset, sign, line, len);
524 else if (sign == '+' && new_blank_line_at_eof(ecbdata, line, len))
525 /* Blank line at EOF - paint '+' as well */
526 emit_line_0(ecbdata->opt, ws, reset, sign, line, len);
527 else {
528 /* Emit just the prefix, then the rest. */
529 emit_line_0(ecbdata->opt, set, reset, sign, "", 0);
530 ws_check_emit(line, len, ecbdata->ws_rule,
531 ecbdata->opt->file, set, reset, ws);
532 }
533 }
534
535 static void emit_add_line(const char *reset,
536 struct emit_callback *ecbdata,
537 const char *line, int len)
538 {
539 emit_line_checked(reset, ecbdata, line, len,
540 DIFF_FILE_NEW, WSEH_NEW, '+');
541 }
542
543 static void emit_del_line(const char *reset,
544 struct emit_callback *ecbdata,
545 const char *line, int len)
546 {
547 emit_line_checked(reset, ecbdata, line, len,
548 DIFF_FILE_OLD, WSEH_OLD, '-');
549 }
550
551 static void emit_context_line(const char *reset,
552 struct emit_callback *ecbdata,
553 const char *line, int len)
554 {
555 emit_line_checked(reset, ecbdata, line, len,
556 DIFF_CONTEXT, WSEH_CONTEXT, ' ');
557 }
558
559 static void emit_hunk_header(struct emit_callback *ecbdata,
560 const char *line, int len)
561 {
562 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
563 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
564 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
565 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
566 static const char atat[2] = { '@', '@' };
567 const char *cp, *ep;
568 struct strbuf msgbuf = STRBUF_INIT;
569 int org_len = len;
570 int i = 1;
571
572 /*
573 * As a hunk header must begin with "@@ -<old>, +<new> @@",
574 * it always is at least 10 bytes long.
575 */
576 if (len < 10 ||
577 memcmp(line, atat, 2) ||
578 !(ep = memmem(line + 2, len - 2, atat, 2))) {
579 emit_line(ecbdata->opt, context, reset, line, len);
580 return;
581 }
582 ep += 2; /* skip over @@ */
583
584 /* The hunk header in fraginfo color */
585 strbuf_addstr(&msgbuf, frag);
586 strbuf_add(&msgbuf, line, ep - line);
587 strbuf_addstr(&msgbuf, reset);
588
589 /*
590 * trailing "\r\n"
591 */
592 for ( ; i < 3; i++)
593 if (line[len - i] == '\r' || line[len - i] == '\n')
594 len--;
595
596 /* blank before the func header */
597 for (cp = ep; ep - line < len; ep++)
598 if (*ep != ' ' && *ep != '\t')
599 break;
600 if (ep != cp) {
601 strbuf_addstr(&msgbuf, context);
602 strbuf_add(&msgbuf, cp, ep - cp);
603 strbuf_addstr(&msgbuf, reset);
604 }
605
606 if (ep < line + len) {
607 strbuf_addstr(&msgbuf, func);
608 strbuf_add(&msgbuf, ep, line + len - ep);
609 strbuf_addstr(&msgbuf, reset);
610 }
611
612 strbuf_add(&msgbuf, line + len, org_len - len);
613 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
614 strbuf_release(&msgbuf);
615 }
616
617 static struct diff_tempfile *claim_diff_tempfile(void) {
618 int i;
619 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
620 if (!diff_temp[i].name)
621 return diff_temp + i;
622 die("BUG: diff is failing to clean up its tempfiles");
623 }
624
625 static void remove_tempfile(void)
626 {
627 int i;
628 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
629 if (is_tempfile_active(&diff_temp[i].tempfile))
630 delete_tempfile(&diff_temp[i].tempfile);
631 diff_temp[i].name = NULL;
632 }
633 }
634
635 static void print_line_count(FILE *file, int count)
636 {
637 switch (count) {
638 case 0:
639 fprintf(file, "0,0");
640 break;
641 case 1:
642 fprintf(file, "1");
643 break;
644 default:
645 fprintf(file, "1,%d", count);
646 break;
647 }
648 }
649
650 static void emit_rewrite_lines(struct emit_callback *ecb,
651 int prefix, const char *data, int size)
652 {
653 const char *endp = NULL;
654 static const char *nneof = " No newline at end of file\n";
655 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
656
657 while (0 < size) {
658 int len;
659
660 endp = memchr(data, '\n', size);
661 len = endp ? (endp - data + 1) : size;
662 if (prefix != '+') {
663 ecb->lno_in_preimage++;
664 emit_del_line(reset, ecb, data, len);
665 } else {
666 ecb->lno_in_postimage++;
667 emit_add_line(reset, ecb, data, len);
668 }
669 size -= len;
670 data += len;
671 }
672 if (!endp) {
673 const char *context = diff_get_color(ecb->color_diff,
674 DIFF_CONTEXT);
675 putc('\n', ecb->opt->file);
676 emit_line_0(ecb->opt, context, reset, '\\',
677 nneof, strlen(nneof));
678 }
679 }
680
681 static void emit_rewrite_diff(const char *name_a,
682 const char *name_b,
683 struct diff_filespec *one,
684 struct diff_filespec *two,
685 struct userdiff_driver *textconv_one,
686 struct userdiff_driver *textconv_two,
687 struct diff_options *o)
688 {
689 int lc_a, lc_b;
690 const char *name_a_tab, *name_b_tab;
691 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
692 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
693 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
694 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
695 const char *a_prefix, *b_prefix;
696 char *data_one, *data_two;
697 size_t size_one, size_two;
698 struct emit_callback ecbdata;
699 const char *line_prefix = diff_line_prefix(o);
700
701 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
702 a_prefix = o->b_prefix;
703 b_prefix = o->a_prefix;
704 } else {
705 a_prefix = o->a_prefix;
706 b_prefix = o->b_prefix;
707 }
708
709 name_a += (*name_a == '/');
710 name_b += (*name_b == '/');
711 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
712 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
713
714 strbuf_reset(&a_name);
715 strbuf_reset(&b_name);
716 quote_two_c_style(&a_name, a_prefix, name_a, 0);
717 quote_two_c_style(&b_name, b_prefix, name_b, 0);
718
719 size_one = fill_textconv(textconv_one, one, &data_one);
720 size_two = fill_textconv(textconv_two, two, &data_two);
721
722 memset(&ecbdata, 0, sizeof(ecbdata));
723 ecbdata.color_diff = want_color(o->use_color);
724 ecbdata.ws_rule = whitespace_rule(name_b);
725 ecbdata.opt = o;
726 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
727 mmfile_t mf1, mf2;
728 mf1.ptr = (char *)data_one;
729 mf2.ptr = (char *)data_two;
730 mf1.size = size_one;
731 mf2.size = size_two;
732 check_blank_at_eof(&mf1, &mf2, &ecbdata);
733 }
734 ecbdata.lno_in_preimage = 1;
735 ecbdata.lno_in_postimage = 1;
736
737 lc_a = count_lines(data_one, size_one);
738 lc_b = count_lines(data_two, size_two);
739 fprintf(o->file,
740 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
741 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
742 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
743 line_prefix, fraginfo);
744 if (!o->irreversible_delete)
745 print_line_count(o->file, lc_a);
746 else
747 fprintf(o->file, "?,?");
748 fprintf(o->file, " +");
749 print_line_count(o->file, lc_b);
750 fprintf(o->file, " @@%s\n", reset);
751 if (lc_a && !o->irreversible_delete)
752 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
753 if (lc_b)
754 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
755 if (textconv_one)
756 free((char *)data_one);
757 if (textconv_two)
758 free((char *)data_two);
759 }
760
761 struct diff_words_buffer {
762 mmfile_t text;
763 long alloc;
764 struct diff_words_orig {
765 const char *begin, *end;
766 } *orig;
767 int orig_nr, orig_alloc;
768 };
769
770 static void diff_words_append(char *line, unsigned long len,
771 struct diff_words_buffer *buffer)
772 {
773 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
774 line++;
775 len--;
776 memcpy(buffer->text.ptr + buffer->text.size, line, len);
777 buffer->text.size += len;
778 buffer->text.ptr[buffer->text.size] = '\0';
779 }
780
781 struct diff_words_style_elem {
782 const char *prefix;
783 const char *suffix;
784 const char *color; /* NULL; filled in by the setup code if
785 * color is enabled */
786 };
787
788 struct diff_words_style {
789 enum diff_words_type type;
790 struct diff_words_style_elem new, old, ctx;
791 const char *newline;
792 };
793
794 static struct diff_words_style diff_words_styles[] = {
795 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
796 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
797 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
798 };
799
800 struct diff_words_data {
801 struct diff_words_buffer minus, plus;
802 const char *current_plus;
803 int last_minus;
804 struct diff_options *opt;
805 regex_t *word_regex;
806 enum diff_words_type type;
807 struct diff_words_style *style;
808 };
809
810 static int fn_out_diff_words_write_helper(FILE *fp,
811 struct diff_words_style_elem *st_el,
812 const char *newline,
813 size_t count, const char *buf,
814 const char *line_prefix)
815 {
816 int print = 0;
817
818 while (count) {
819 char *p = memchr(buf, '\n', count);
820 if (print)
821 fputs(line_prefix, fp);
822 if (p != buf) {
823 if (st_el->color && fputs(st_el->color, fp) < 0)
824 return -1;
825 if (fputs(st_el->prefix, fp) < 0 ||
826 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
827 fputs(st_el->suffix, fp) < 0)
828 return -1;
829 if (st_el->color && *st_el->color
830 && fputs(GIT_COLOR_RESET, fp) < 0)
831 return -1;
832 }
833 if (!p)
834 return 0;
835 if (fputs(newline, fp) < 0)
836 return -1;
837 count -= p + 1 - buf;
838 buf = p + 1;
839 print = 1;
840 }
841 return 0;
842 }
843
844 /*
845 * '--color-words' algorithm can be described as:
846 *
847 * 1. collect a the minus/plus lines of a diff hunk, divided into
848 * minus-lines and plus-lines;
849 *
850 * 2. break both minus-lines and plus-lines into words and
851 * place them into two mmfile_t with one word for each line;
852 *
853 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
854 *
855 * And for the common parts of the both file, we output the plus side text.
856 * diff_words->current_plus is used to trace the current position of the plus file
857 * which printed. diff_words->last_minus is used to trace the last minus word
858 * printed.
859 *
860 * For '--graph' to work with '--color-words', we need to output the graph prefix
861 * on each line of color words output. Generally, there are two conditions on
862 * which we should output the prefix.
863 *
864 * 1. diff_words->last_minus == 0 &&
865 * diff_words->current_plus == diff_words->plus.text.ptr
866 *
867 * that is: the plus text must start as a new line, and if there is no minus
868 * word printed, a graph prefix must be printed.
869 *
870 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
871 * *(diff_words->current_plus - 1) == '\n'
872 *
873 * that is: a graph prefix must be printed following a '\n'
874 */
875 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
876 {
877 if ((diff_words->last_minus == 0 &&
878 diff_words->current_plus == diff_words->plus.text.ptr) ||
879 (diff_words->current_plus > diff_words->plus.text.ptr &&
880 *(diff_words->current_plus - 1) == '\n')) {
881 return 1;
882 } else {
883 return 0;
884 }
885 }
886
887 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
888 {
889 struct diff_words_data *diff_words = priv;
890 struct diff_words_style *style = diff_words->style;
891 int minus_first, minus_len, plus_first, plus_len;
892 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
893 struct diff_options *opt = diff_words->opt;
894 const char *line_prefix;
895
896 if (line[0] != '@' || parse_hunk_header(line, len,
897 &minus_first, &minus_len, &plus_first, &plus_len))
898 return;
899
900 assert(opt);
901 line_prefix = diff_line_prefix(opt);
902
903 /* POSIX requires that first be decremented by one if len == 0... */
904 if (minus_len) {
905 minus_begin = diff_words->minus.orig[minus_first].begin;
906 minus_end =
907 diff_words->minus.orig[minus_first + minus_len - 1].end;
908 } else
909 minus_begin = minus_end =
910 diff_words->minus.orig[minus_first].end;
911
912 if (plus_len) {
913 plus_begin = diff_words->plus.orig[plus_first].begin;
914 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
915 } else
916 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
917
918 if (color_words_output_graph_prefix(diff_words)) {
919 fputs(line_prefix, diff_words->opt->file);
920 }
921 if (diff_words->current_plus != plus_begin) {
922 fn_out_diff_words_write_helper(diff_words->opt->file,
923 &style->ctx, style->newline,
924 plus_begin - diff_words->current_plus,
925 diff_words->current_plus, line_prefix);
926 if (*(plus_begin - 1) == '\n')
927 fputs(line_prefix, diff_words->opt->file);
928 }
929 if (minus_begin != minus_end) {
930 fn_out_diff_words_write_helper(diff_words->opt->file,
931 &style->old, style->newline,
932 minus_end - minus_begin, minus_begin,
933 line_prefix);
934 }
935 if (plus_begin != plus_end) {
936 fn_out_diff_words_write_helper(diff_words->opt->file,
937 &style->new, style->newline,
938 plus_end - plus_begin, plus_begin,
939 line_prefix);
940 }
941
942 diff_words->current_plus = plus_end;
943 diff_words->last_minus = minus_first;
944 }
945
946 /* This function starts looking at *begin, and returns 0 iff a word was found. */
947 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
948 int *begin, int *end)
949 {
950 if (word_regex && *begin < buffer->size) {
951 regmatch_t match[1];
952 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
953 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
954 '\n', match[0].rm_eo - match[0].rm_so);
955 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
956 *begin += match[0].rm_so;
957 return *begin >= *end;
958 }
959 return -1;
960 }
961
962 /* find the next word */
963 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
964 (*begin)++;
965 if (*begin >= buffer->size)
966 return -1;
967
968 /* find the end of the word */
969 *end = *begin + 1;
970 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
971 (*end)++;
972
973 return 0;
974 }
975
976 /*
977 * This function splits the words in buffer->text, stores the list with
978 * newline separator into out, and saves the offsets of the original words
979 * in buffer->orig.
980 */
981 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
982 regex_t *word_regex)
983 {
984 int i, j;
985 long alloc = 0;
986
987 out->size = 0;
988 out->ptr = NULL;
989
990 /* fake an empty "0th" word */
991 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
992 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
993 buffer->orig_nr = 1;
994
995 for (i = 0; i < buffer->text.size; i++) {
996 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
997 return;
998
999 /* store original boundaries */
1000 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
1001 buffer->orig_alloc);
1002 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
1003 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
1004 buffer->orig_nr++;
1005
1006 /* store one word */
1007 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
1008 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
1009 out->ptr[out->size + j - i] = '\n';
1010 out->size += j - i + 1;
1011
1012 i = j - 1;
1013 }
1014 }
1015
1016 /* this executes the word diff on the accumulated buffers */
1017 static void diff_words_show(struct diff_words_data *diff_words)
1018 {
1019 xpparam_t xpp;
1020 xdemitconf_t xecfg;
1021 mmfile_t minus, plus;
1022 struct diff_words_style *style = diff_words->style;
1023
1024 struct diff_options *opt = diff_words->opt;
1025 const char *line_prefix;
1026
1027 assert(opt);
1028 line_prefix = diff_line_prefix(opt);
1029
1030 /* special case: only removal */
1031 if (!diff_words->plus.text.size) {
1032 fputs(line_prefix, diff_words->opt->file);
1033 fn_out_diff_words_write_helper(diff_words->opt->file,
1034 &style->old, style->newline,
1035 diff_words->minus.text.size,
1036 diff_words->minus.text.ptr, line_prefix);
1037 diff_words->minus.text.size = 0;
1038 return;
1039 }
1040
1041 diff_words->current_plus = diff_words->plus.text.ptr;
1042 diff_words->last_minus = 0;
1043
1044 memset(&xpp, 0, sizeof(xpp));
1045 memset(&xecfg, 0, sizeof(xecfg));
1046 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
1047 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
1048 xpp.flags = 0;
1049 /* as only the hunk header will be parsed, we need a 0-context */
1050 xecfg.ctxlen = 0;
1051 if (xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
1052 &xpp, &xecfg))
1053 die("unable to generate word diff");
1054 free(minus.ptr);
1055 free(plus.ptr);
1056 if (diff_words->current_plus != diff_words->plus.text.ptr +
1057 diff_words->plus.text.size) {
1058 if (color_words_output_graph_prefix(diff_words))
1059 fputs(line_prefix, diff_words->opt->file);
1060 fn_out_diff_words_write_helper(diff_words->opt->file,
1061 &style->ctx, style->newline,
1062 diff_words->plus.text.ptr + diff_words->plus.text.size
1063 - diff_words->current_plus, diff_words->current_plus,
1064 line_prefix);
1065 }
1066 diff_words->minus.text.size = diff_words->plus.text.size = 0;
1067 }
1068
1069 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
1070 static void diff_words_flush(struct emit_callback *ecbdata)
1071 {
1072 if (ecbdata->diff_words->minus.text.size ||
1073 ecbdata->diff_words->plus.text.size)
1074 diff_words_show(ecbdata->diff_words);
1075 }
1076
1077 static void diff_filespec_load_driver(struct diff_filespec *one)
1078 {
1079 /* Use already-loaded driver */
1080 if (one->driver)
1081 return;
1082
1083 if (S_ISREG(one->mode))
1084 one->driver = userdiff_find_by_path(one->path);
1085
1086 /* Fallback to default settings */
1087 if (!one->driver)
1088 one->driver = userdiff_find_by_name("default");
1089 }
1090
1091 static const char *userdiff_word_regex(struct diff_filespec *one)
1092 {
1093 diff_filespec_load_driver(one);
1094 return one->driver->word_regex;
1095 }
1096
1097 static void init_diff_words_data(struct emit_callback *ecbdata,
1098 struct diff_options *orig_opts,
1099 struct diff_filespec *one,
1100 struct diff_filespec *two)
1101 {
1102 int i;
1103 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1104 memcpy(o, orig_opts, sizeof(struct diff_options));
1105
1106 ecbdata->diff_words =
1107 xcalloc(1, sizeof(struct diff_words_data));
1108 ecbdata->diff_words->type = o->word_diff;
1109 ecbdata->diff_words->opt = o;
1110 if (!o->word_regex)
1111 o->word_regex = userdiff_word_regex(one);
1112 if (!o->word_regex)
1113 o->word_regex = userdiff_word_regex(two);
1114 if (!o->word_regex)
1115 o->word_regex = diff_word_regex_cfg;
1116 if (o->word_regex) {
1117 ecbdata->diff_words->word_regex = (regex_t *)
1118 xmalloc(sizeof(regex_t));
1119 if (regcomp(ecbdata->diff_words->word_regex,
1120 o->word_regex,
1121 REG_EXTENDED | REG_NEWLINE))
1122 die ("Invalid regular expression: %s",
1123 o->word_regex);
1124 }
1125 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1126 if (o->word_diff == diff_words_styles[i].type) {
1127 ecbdata->diff_words->style =
1128 &diff_words_styles[i];
1129 break;
1130 }
1131 }
1132 if (want_color(o->use_color)) {
1133 struct diff_words_style *st = ecbdata->diff_words->style;
1134 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1135 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1136 st->ctx.color = diff_get_color_opt(o, DIFF_CONTEXT);
1137 }
1138 }
1139
1140 static void free_diff_words_data(struct emit_callback *ecbdata)
1141 {
1142 if (ecbdata->diff_words) {
1143 diff_words_flush(ecbdata);
1144 free (ecbdata->diff_words->opt);
1145 free (ecbdata->diff_words->minus.text.ptr);
1146 free (ecbdata->diff_words->minus.orig);
1147 free (ecbdata->diff_words->plus.text.ptr);
1148 free (ecbdata->diff_words->plus.orig);
1149 if (ecbdata->diff_words->word_regex) {
1150 regfree(ecbdata->diff_words->word_regex);
1151 free(ecbdata->diff_words->word_regex);
1152 }
1153 free(ecbdata->diff_words);
1154 ecbdata->diff_words = NULL;
1155 }
1156 }
1157
1158 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1159 {
1160 if (want_color(diff_use_color))
1161 return diff_colors[ix];
1162 return "";
1163 }
1164
1165 const char *diff_line_prefix(struct diff_options *opt)
1166 {
1167 struct strbuf *msgbuf;
1168 if (!opt->output_prefix)
1169 return "";
1170
1171 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
1172 return msgbuf->buf;
1173 }
1174
1175 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1176 {
1177 const char *cp;
1178 unsigned long allot;
1179 size_t l = len;
1180
1181 if (ecb->truncate)
1182 return ecb->truncate(line, len);
1183 cp = line;
1184 allot = l;
1185 while (0 < l) {
1186 (void) utf8_width(&cp, &l);
1187 if (!cp)
1188 break; /* truncated in the middle? */
1189 }
1190 return allot - l;
1191 }
1192
1193 static void find_lno(const char *line, struct emit_callback *ecbdata)
1194 {
1195 const char *p;
1196 ecbdata->lno_in_preimage = 0;
1197 ecbdata->lno_in_postimage = 0;
1198 p = strchr(line, '-');
1199 if (!p)
1200 return; /* cannot happen */
1201 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1202 p = strchr(p, '+');
1203 if (!p)
1204 return; /* cannot happen */
1205 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1206 }
1207
1208 static void fn_out_consume(void *priv, char *line, unsigned long len)
1209 {
1210 struct emit_callback *ecbdata = priv;
1211 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1212 const char *context = diff_get_color(ecbdata->color_diff, DIFF_CONTEXT);
1213 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1214 struct diff_options *o = ecbdata->opt;
1215 const char *line_prefix = diff_line_prefix(o);
1216
1217 o->found_changes = 1;
1218
1219 if (ecbdata->header) {
1220 fprintf(o->file, "%s", ecbdata->header->buf);
1221 strbuf_reset(ecbdata->header);
1222 ecbdata->header = NULL;
1223 }
1224
1225 if (ecbdata->label_path[0]) {
1226 const char *name_a_tab, *name_b_tab;
1227
1228 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1229 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1230
1231 fprintf(o->file, "%s%s--- %s%s%s\n",
1232 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1233 fprintf(o->file, "%s%s+++ %s%s%s\n",
1234 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1235 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1236 }
1237
1238 if (diff_suppress_blank_empty
1239 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1240 line[0] = '\n';
1241 len = 1;
1242 }
1243
1244 if (line[0] == '@') {
1245 if (ecbdata->diff_words)
1246 diff_words_flush(ecbdata);
1247 len = sane_truncate_line(ecbdata, line, len);
1248 find_lno(line, ecbdata);
1249 emit_hunk_header(ecbdata, line, len);
1250 if (line[len-1] != '\n')
1251 putc('\n', o->file);
1252 return;
1253 }
1254
1255 if (ecbdata->diff_words) {
1256 if (line[0] == '-') {
1257 diff_words_append(line, len,
1258 &ecbdata->diff_words->minus);
1259 return;
1260 } else if (line[0] == '+') {
1261 diff_words_append(line, len,
1262 &ecbdata->diff_words->plus);
1263 return;
1264 } else if (starts_with(line, "\\ ")) {
1265 /*
1266 * Eat the "no newline at eof" marker as if we
1267 * saw a "+" or "-" line with nothing on it,
1268 * and return without diff_words_flush() to
1269 * defer processing. If this is the end of
1270 * preimage, more "+" lines may come after it.
1271 */
1272 return;
1273 }
1274 diff_words_flush(ecbdata);
1275 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1276 emit_line(o, context, reset, line, len);
1277 fputs("~\n", o->file);
1278 } else {
1279 /*
1280 * Skip the prefix character, if any. With
1281 * diff_suppress_blank_empty, there may be
1282 * none.
1283 */
1284 if (line[0] != '\n') {
1285 line++;
1286 len--;
1287 }
1288 emit_line(o, context, reset, line, len);
1289 }
1290 return;
1291 }
1292
1293 switch (line[0]) {
1294 case '+':
1295 ecbdata->lno_in_postimage++;
1296 emit_add_line(reset, ecbdata, line + 1, len - 1);
1297 break;
1298 case '-':
1299 ecbdata->lno_in_preimage++;
1300 emit_del_line(reset, ecbdata, line + 1, len - 1);
1301 break;
1302 case ' ':
1303 ecbdata->lno_in_postimage++;
1304 ecbdata->lno_in_preimage++;
1305 emit_context_line(reset, ecbdata, line + 1, len - 1);
1306 break;
1307 default:
1308 /* incomplete line at the end */
1309 ecbdata->lno_in_preimage++;
1310 emit_line(o, diff_get_color(ecbdata->color_diff, DIFF_CONTEXT),
1311 reset, line, len);
1312 break;
1313 }
1314 }
1315
1316 static char *pprint_rename(const char *a, const char *b)
1317 {
1318 const char *old = a;
1319 const char *new = b;
1320 struct strbuf name = STRBUF_INIT;
1321 int pfx_length, sfx_length;
1322 int pfx_adjust_for_slash;
1323 int len_a = strlen(a);
1324 int len_b = strlen(b);
1325 int a_midlen, b_midlen;
1326 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1327 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1328
1329 if (qlen_a || qlen_b) {
1330 quote_c_style(a, &name, NULL, 0);
1331 strbuf_addstr(&name, " => ");
1332 quote_c_style(b, &name, NULL, 0);
1333 return strbuf_detach(&name, NULL);
1334 }
1335
1336 /* Find common prefix */
1337 pfx_length = 0;
1338 while (*old && *new && *old == *new) {
1339 if (*old == '/')
1340 pfx_length = old - a + 1;
1341 old++;
1342 new++;
1343 }
1344
1345 /* Find common suffix */
1346 old = a + len_a;
1347 new = b + len_b;
1348 sfx_length = 0;
1349 /*
1350 * If there is a common prefix, it must end in a slash. In
1351 * that case we let this loop run 1 into the prefix to see the
1352 * same slash.
1353 *
1354 * If there is no common prefix, we cannot do this as it would
1355 * underrun the input strings.
1356 */
1357 pfx_adjust_for_slash = (pfx_length ? 1 : 0);
1358 while (a + pfx_length - pfx_adjust_for_slash <= old &&
1359 b + pfx_length - pfx_adjust_for_slash <= new &&
1360 *old == *new) {
1361 if (*old == '/')
1362 sfx_length = len_a - (old - a);
1363 old--;
1364 new--;
1365 }
1366
1367 /*
1368 * pfx{mid-a => mid-b}sfx
1369 * {pfx-a => pfx-b}sfx
1370 * pfx{sfx-a => sfx-b}
1371 * name-a => name-b
1372 */
1373 a_midlen = len_a - pfx_length - sfx_length;
1374 b_midlen = len_b - pfx_length - sfx_length;
1375 if (a_midlen < 0)
1376 a_midlen = 0;
1377 if (b_midlen < 0)
1378 b_midlen = 0;
1379
1380 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1381 if (pfx_length + sfx_length) {
1382 strbuf_add(&name, a, pfx_length);
1383 strbuf_addch(&name, '{');
1384 }
1385 strbuf_add(&name, a + pfx_length, a_midlen);
1386 strbuf_addstr(&name, " => ");
1387 strbuf_add(&name, b + pfx_length, b_midlen);
1388 if (pfx_length + sfx_length) {
1389 strbuf_addch(&name, '}');
1390 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1391 }
1392 return strbuf_detach(&name, NULL);
1393 }
1394
1395 struct diffstat_t {
1396 int nr;
1397 int alloc;
1398 struct diffstat_file {
1399 char *from_name;
1400 char *name;
1401 char *print_name;
1402 unsigned is_unmerged:1;
1403 unsigned is_binary:1;
1404 unsigned is_renamed:1;
1405 unsigned is_interesting:1;
1406 uintmax_t added, deleted;
1407 } **files;
1408 };
1409
1410 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1411 const char *name_a,
1412 const char *name_b)
1413 {
1414 struct diffstat_file *x;
1415 x = xcalloc(1, sizeof(*x));
1416 ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
1417 diffstat->files[diffstat->nr++] = x;
1418 if (name_b) {
1419 x->from_name = xstrdup(name_a);
1420 x->name = xstrdup(name_b);
1421 x->is_renamed = 1;
1422 }
1423 else {
1424 x->from_name = NULL;
1425 x->name = xstrdup(name_a);
1426 }
1427 return x;
1428 }
1429
1430 static void diffstat_consume(void *priv, char *line, unsigned long len)
1431 {
1432 struct diffstat_t *diffstat = priv;
1433 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1434
1435 if (line[0] == '+')
1436 x->added++;
1437 else if (line[0] == '-')
1438 x->deleted++;
1439 }
1440
1441 const char mime_boundary_leader[] = "------------";
1442
1443 static int scale_linear(int it, int width, int max_change)
1444 {
1445 if (!it)
1446 return 0;
1447 /*
1448 * make sure that at least one '-' or '+' is printed if
1449 * there is any change to this path. The easiest way is to
1450 * scale linearly as if the alloted width is one column shorter
1451 * than it is, and then add 1 to the result.
1452 */
1453 return 1 + (it * (width - 1) / max_change);
1454 }
1455
1456 static void show_name(FILE *file,
1457 const char *prefix, const char *name, int len)
1458 {
1459 fprintf(file, " %s%-*s |", prefix, len, name);
1460 }
1461
1462 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1463 {
1464 if (cnt <= 0)
1465 return;
1466 fprintf(file, "%s", set);
1467 while (cnt--)
1468 putc(ch, file);
1469 fprintf(file, "%s", reset);
1470 }
1471
1472 static void fill_print_name(struct diffstat_file *file)
1473 {
1474 char *pname;
1475
1476 if (file->print_name)
1477 return;
1478
1479 if (!file->is_renamed) {
1480 struct strbuf buf = STRBUF_INIT;
1481 if (quote_c_style(file->name, &buf, NULL, 0)) {
1482 pname = strbuf_detach(&buf, NULL);
1483 } else {
1484 pname = file->name;
1485 strbuf_release(&buf);
1486 }
1487 } else {
1488 pname = pprint_rename(file->from_name, file->name);
1489 }
1490 file->print_name = pname;
1491 }
1492
1493 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1494 {
1495 struct strbuf sb = STRBUF_INIT;
1496 int ret;
1497
1498 if (!files) {
1499 assert(insertions == 0 && deletions == 0);
1500 return fprintf(fp, "%s\n", " 0 files changed");
1501 }
1502
1503 strbuf_addf(&sb,
1504 (files == 1) ? " %d file changed" : " %d files changed",
1505 files);
1506
1507 /*
1508 * For binary diff, the caller may want to print "x files
1509 * changed" with insertions == 0 && deletions == 0.
1510 *
1511 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1512 * is probably less confusing (i.e skip over "2 files changed
1513 * but nothing about added/removed lines? Is this a bug in Git?").
1514 */
1515 if (insertions || deletions == 0) {
1516 strbuf_addf(&sb,
1517 (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
1518 insertions);
1519 }
1520
1521 if (deletions || insertions == 0) {
1522 strbuf_addf(&sb,
1523 (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
1524 deletions);
1525 }
1526 strbuf_addch(&sb, '\n');
1527 ret = fputs(sb.buf, fp);
1528 strbuf_release(&sb);
1529 return ret;
1530 }
1531
1532 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1533 {
1534 int i, len, add, del, adds = 0, dels = 0;
1535 uintmax_t max_change = 0, max_len = 0;
1536 int total_files = data->nr, count;
1537 int width, name_width, graph_width, number_width = 0, bin_width = 0;
1538 const char *reset, *add_c, *del_c;
1539 const char *line_prefix = "";
1540 int extra_shown = 0;
1541
1542 if (data->nr == 0)
1543 return;
1544
1545 line_prefix = diff_line_prefix(options);
1546 count = options->stat_count ? options->stat_count : data->nr;
1547
1548 reset = diff_get_color_opt(options, DIFF_RESET);
1549 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1550 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1551
1552 /*
1553 * Find the longest filename and max number of changes
1554 */
1555 for (i = 0; (i < count) && (i < data->nr); i++) {
1556 struct diffstat_file *file = data->files[i];
1557 uintmax_t change = file->added + file->deleted;
1558
1559 if (!file->is_interesting && (change == 0)) {
1560 count++; /* not shown == room for one more */
1561 continue;
1562 }
1563 fill_print_name(file);
1564 len = strlen(file->print_name);
1565 if (max_len < len)
1566 max_len = len;
1567
1568 if (file->is_unmerged) {
1569 /* "Unmerged" is 8 characters */
1570 bin_width = bin_width < 8 ? 8 : bin_width;
1571 continue;
1572 }
1573 if (file->is_binary) {
1574 /* "Bin XXX -> YYY bytes" */
1575 int w = 14 + decimal_width(file->added)
1576 + decimal_width(file->deleted);
1577 bin_width = bin_width < w ? w : bin_width;
1578 /* Display change counts aligned with "Bin" */
1579 number_width = 3;
1580 continue;
1581 }
1582
1583 if (max_change < change)
1584 max_change = change;
1585 }
1586 count = i; /* where we can stop scanning in data->files[] */
1587
1588 /*
1589 * We have width = stat_width or term_columns() columns total.
1590 * We want a maximum of min(max_len, stat_name_width) for the name part.
1591 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1592 * We also need 1 for " " and 4 + decimal_width(max_change)
1593 * for " | NNNN " and one the empty column at the end, altogether
1594 * 6 + decimal_width(max_change).
1595 *
1596 * If there's not enough space, we will use the smaller of
1597 * stat_name_width (if set) and 5/8*width for the filename,
1598 * and the rest for constant elements + graph part, but no more
1599 * than stat_graph_width for the graph part.
1600 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1601 * for the standard terminal size).
1602 *
1603 * In other words: stat_width limits the maximum width, and
1604 * stat_name_width fixes the maximum width of the filename,
1605 * and is also used to divide available columns if there
1606 * aren't enough.
1607 *
1608 * Binary files are displayed with "Bin XXX -> YYY bytes"
1609 * instead of the change count and graph. This part is treated
1610 * similarly to the graph part, except that it is not
1611 * "scaled". If total width is too small to accommodate the
1612 * guaranteed minimum width of the filename part and the
1613 * separators and this message, this message will "overflow"
1614 * making the line longer than the maximum width.
1615 */
1616
1617 if (options->stat_width == -1)
1618 width = term_columns() - options->output_prefix_length;
1619 else
1620 width = options->stat_width ? options->stat_width : 80;
1621 number_width = decimal_width(max_change) > number_width ?
1622 decimal_width(max_change) : number_width;
1623
1624 if (options->stat_graph_width == -1)
1625 options->stat_graph_width = diff_stat_graph_width;
1626
1627 /*
1628 * Guarantee 3/8*16==6 for the graph part
1629 * and 5/8*16==10 for the filename part
1630 */
1631 if (width < 16 + 6 + number_width)
1632 width = 16 + 6 + number_width;
1633
1634 /*
1635 * First assign sizes that are wanted, ignoring available width.
1636 * strlen("Bin XXX -> YYY bytes") == bin_width, and the part
1637 * starting from "XXX" should fit in graph_width.
1638 */
1639 graph_width = max_change + 4 > bin_width ? max_change : bin_width - 4;
1640 if (options->stat_graph_width &&
1641 options->stat_graph_width < graph_width)
1642 graph_width = options->stat_graph_width;
1643
1644 name_width = (options->stat_name_width > 0 &&
1645 options->stat_name_width < max_len) ?
1646 options->stat_name_width : max_len;
1647
1648 /*
1649 * Adjust adjustable widths not to exceed maximum width
1650 */
1651 if (name_width + number_width + 6 + graph_width > width) {
1652 if (graph_width > width * 3/8 - number_width - 6) {
1653 graph_width = width * 3/8 - number_width - 6;
1654 if (graph_width < 6)
1655 graph_width = 6;
1656 }
1657
1658 if (options->stat_graph_width &&
1659 graph_width > options->stat_graph_width)
1660 graph_width = options->stat_graph_width;
1661 if (name_width > width - number_width - 6 - graph_width)
1662 name_width = width - number_width - 6 - graph_width;
1663 else
1664 graph_width = width - number_width - 6 - name_width;
1665 }
1666
1667 /*
1668 * From here name_width is the width of the name area,
1669 * and graph_width is the width of the graph area.
1670 * max_change is used to scale graph properly.
1671 */
1672 for (i = 0; i < count; i++) {
1673 const char *prefix = "";
1674 struct diffstat_file *file = data->files[i];
1675 char *name = file->print_name;
1676 uintmax_t added = file->added;
1677 uintmax_t deleted = file->deleted;
1678 int name_len;
1679
1680 if (!file->is_interesting && (added + deleted == 0))
1681 continue;
1682
1683 /*
1684 * "scale" the filename
1685 */
1686 len = name_width;
1687 name_len = strlen(name);
1688 if (name_width < name_len) {
1689 char *slash;
1690 prefix = "...";
1691 len -= 3;
1692 name += name_len - len;
1693 slash = strchr(name, '/');
1694 if (slash)
1695 name = slash;
1696 }
1697
1698 if (file->is_binary) {
1699 fprintf(options->file, "%s", line_prefix);
1700 show_name(options->file, prefix, name, len);
1701 fprintf(options->file, " %*s", number_width, "Bin");
1702 if (!added && !deleted) {
1703 putc('\n', options->file);
1704 continue;
1705 }
1706 fprintf(options->file, " %s%"PRIuMAX"%s",
1707 del_c, deleted, reset);
1708 fprintf(options->file, " -> ");
1709 fprintf(options->file, "%s%"PRIuMAX"%s",
1710 add_c, added, reset);
1711 fprintf(options->file, " bytes");
1712 fprintf(options->file, "\n");
1713 continue;
1714 }
1715 else if (file->is_unmerged) {
1716 fprintf(options->file, "%s", line_prefix);
1717 show_name(options->file, prefix, name, len);
1718 fprintf(options->file, " Unmerged\n");
1719 continue;
1720 }
1721
1722 /*
1723 * scale the add/delete
1724 */
1725 add = added;
1726 del = deleted;
1727
1728 if (graph_width <= max_change) {
1729 int total = scale_linear(add + del, graph_width, max_change);
1730 if (total < 2 && add && del)
1731 /* width >= 2 due to the sanity check */
1732 total = 2;
1733 if (add < del) {
1734 add = scale_linear(add, graph_width, max_change);
1735 del = total - add;
1736 } else {
1737 del = scale_linear(del, graph_width, max_change);
1738 add = total - del;
1739 }
1740 }
1741 fprintf(options->file, "%s", line_prefix);
1742 show_name(options->file, prefix, name, len);
1743 fprintf(options->file, " %*"PRIuMAX"%s",
1744 number_width, added + deleted,
1745 added + deleted ? " " : "");
1746 show_graph(options->file, '+', add, add_c, reset);
1747 show_graph(options->file, '-', del, del_c, reset);
1748 fprintf(options->file, "\n");
1749 }
1750
1751 for (i = 0; i < data->nr; i++) {
1752 struct diffstat_file *file = data->files[i];
1753 uintmax_t added = file->added;
1754 uintmax_t deleted = file->deleted;
1755
1756 if (file->is_unmerged ||
1757 (!file->is_interesting && (added + deleted == 0))) {
1758 total_files--;
1759 continue;
1760 }
1761
1762 if (!file->is_binary) {
1763 adds += added;
1764 dels += deleted;
1765 }
1766 if (i < count)
1767 continue;
1768 if (!extra_shown)
1769 fprintf(options->file, "%s ...\n", line_prefix);
1770 extra_shown = 1;
1771 }
1772 fprintf(options->file, "%s", line_prefix);
1773 print_stat_summary(options->file, total_files, adds, dels);
1774 }
1775
1776 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1777 {
1778 int i, adds = 0, dels = 0, total_files = data->nr;
1779
1780 if (data->nr == 0)
1781 return;
1782
1783 for (i = 0; i < data->nr; i++) {
1784 int added = data->files[i]->added;
1785 int deleted= data->files[i]->deleted;
1786
1787 if (data->files[i]->is_unmerged ||
1788 (!data->files[i]->is_interesting && (added + deleted == 0))) {
1789 total_files--;
1790 } else if (!data->files[i]->is_binary) { /* don't count bytes */
1791 adds += added;
1792 dels += deleted;
1793 }
1794 }
1795 fprintf(options->file, "%s", diff_line_prefix(options));
1796 print_stat_summary(options->file, total_files, adds, dels);
1797 }
1798
1799 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1800 {
1801 int i;
1802
1803 if (data->nr == 0)
1804 return;
1805
1806 for (i = 0; i < data->nr; i++) {
1807 struct diffstat_file *file = data->files[i];
1808
1809 fprintf(options->file, "%s", diff_line_prefix(options));
1810
1811 if (file->is_binary)
1812 fprintf(options->file, "-\t-\t");
1813 else
1814 fprintf(options->file,
1815 "%"PRIuMAX"\t%"PRIuMAX"\t",
1816 file->added, file->deleted);
1817 if (options->line_termination) {
1818 fill_print_name(file);
1819 if (!file->is_renamed)
1820 write_name_quoted(file->name, options->file,
1821 options->line_termination);
1822 else {
1823 fputs(file->print_name, options->file);
1824 putc(options->line_termination, options->file);
1825 }
1826 } else {
1827 if (file->is_renamed) {
1828 putc('\0', options->file);
1829 write_name_quoted(file->from_name, options->file, '\0');
1830 }
1831 write_name_quoted(file->name, options->file, '\0');
1832 }
1833 }
1834 }
1835
1836 struct dirstat_file {
1837 const char *name;
1838 unsigned long changed;
1839 };
1840
1841 struct dirstat_dir {
1842 struct dirstat_file *files;
1843 int alloc, nr, permille, cumulative;
1844 };
1845
1846 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1847 unsigned long changed, const char *base, int baselen)
1848 {
1849 unsigned long this_dir = 0;
1850 unsigned int sources = 0;
1851 const char *line_prefix = diff_line_prefix(opt);
1852
1853 while (dir->nr) {
1854 struct dirstat_file *f = dir->files;
1855 int namelen = strlen(f->name);
1856 unsigned long this;
1857 char *slash;
1858
1859 if (namelen < baselen)
1860 break;
1861 if (memcmp(f->name, base, baselen))
1862 break;
1863 slash = strchr(f->name + baselen, '/');
1864 if (slash) {
1865 int newbaselen = slash + 1 - f->name;
1866 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1867 sources++;
1868 } else {
1869 this = f->changed;
1870 dir->files++;
1871 dir->nr--;
1872 sources += 2;
1873 }
1874 this_dir += this;
1875 }
1876
1877 /*
1878 * We don't report dirstat's for
1879 * - the top level
1880 * - or cases where everything came from a single directory
1881 * under this directory (sources == 1).
1882 */
1883 if (baselen && sources != 1) {
1884 if (this_dir) {
1885 int permille = this_dir * 1000 / changed;
1886 if (permille >= dir->permille) {
1887 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1888 permille / 10, permille % 10, baselen, base);
1889 if (!dir->cumulative)
1890 return 0;
1891 }
1892 }
1893 }
1894 return this_dir;
1895 }
1896
1897 static int dirstat_compare(const void *_a, const void *_b)
1898 {
1899 const struct dirstat_file *a = _a;
1900 const struct dirstat_file *b = _b;
1901 return strcmp(a->name, b->name);
1902 }
1903
1904 static void show_dirstat(struct diff_options *options)
1905 {
1906 int i;
1907 unsigned long changed;
1908 struct dirstat_dir dir;
1909 struct diff_queue_struct *q = &diff_queued_diff;
1910
1911 dir.files = NULL;
1912 dir.alloc = 0;
1913 dir.nr = 0;
1914 dir.permille = options->dirstat_permille;
1915 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1916
1917 changed = 0;
1918 for (i = 0; i < q->nr; i++) {
1919 struct diff_filepair *p = q->queue[i];
1920 const char *name;
1921 unsigned long copied, added, damage;
1922 int content_changed;
1923
1924 name = p->two->path ? p->two->path : p->one->path;
1925
1926 if (p->one->oid_valid && p->two->oid_valid)
1927 content_changed = oidcmp(&p->one->oid, &p->two->oid);
1928 else
1929 content_changed = 1;
1930
1931 if (!content_changed) {
1932 /*
1933 * The SHA1 has not changed, so pre-/post-content is
1934 * identical. We can therefore skip looking at the
1935 * file contents altogether.
1936 */
1937 damage = 0;
1938 goto found_damage;
1939 }
1940
1941 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1942 /*
1943 * In --dirstat-by-file mode, we don't really need to
1944 * look at the actual file contents at all.
1945 * The fact that the SHA1 changed is enough for us to
1946 * add this file to the list of results
1947 * (with each file contributing equal damage).
1948 */
1949 damage = 1;
1950 goto found_damage;
1951 }
1952
1953 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1954 diff_populate_filespec(p->one, 0);
1955 diff_populate_filespec(p->two, 0);
1956 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1957 &copied, &added);
1958 diff_free_filespec_data(p->one);
1959 diff_free_filespec_data(p->two);
1960 } else if (DIFF_FILE_VALID(p->one)) {
1961 diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
1962 copied = added = 0;
1963 diff_free_filespec_data(p->one);
1964 } else if (DIFF_FILE_VALID(p->two)) {
1965 diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
1966 copied = 0;
1967 added = p->two->size;
1968 diff_free_filespec_data(p->two);
1969 } else
1970 continue;
1971
1972 /*
1973 * Original minus copied is the removed material,
1974 * added is the new material. They are both damages
1975 * made to the preimage.
1976 * If the resulting damage is zero, we know that
1977 * diffcore_count_changes() considers the two entries to
1978 * be identical, but since content_changed is true, we
1979 * know that there must have been _some_ kind of change,
1980 * so we force all entries to have damage > 0.
1981 */
1982 damage = (p->one->size - copied) + added;
1983 if (!damage)
1984 damage = 1;
1985
1986 found_damage:
1987 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1988 dir.files[dir.nr].name = name;
1989 dir.files[dir.nr].changed = damage;
1990 changed += damage;
1991 dir.nr++;
1992 }
1993
1994 /* This can happen even with many files, if everything was renames */
1995 if (!changed)
1996 return;
1997
1998 /* Show all directories with more than x% of the changes */
1999 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2000 gather_dirstat(options, &dir, changed, "", 0);
2001 }
2002
2003 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
2004 {
2005 int i;
2006 unsigned long changed;
2007 struct dirstat_dir dir;
2008
2009 if (data->nr == 0)
2010 return;
2011
2012 dir.files = NULL;
2013 dir.alloc = 0;
2014 dir.nr = 0;
2015 dir.permille = options->dirstat_permille;
2016 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
2017
2018 changed = 0;
2019 for (i = 0; i < data->nr; i++) {
2020 struct diffstat_file *file = data->files[i];
2021 unsigned long damage = file->added + file->deleted;
2022 if (file->is_binary)
2023 /*
2024 * binary files counts bytes, not lines. Must find some
2025 * way to normalize binary bytes vs. textual lines.
2026 * The following heuristic assumes that there are 64
2027 * bytes per "line".
2028 * This is stupid and ugly, but very cheap...
2029 */
2030 damage = (damage + 63) / 64;
2031 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
2032 dir.files[dir.nr].name = file->name;
2033 dir.files[dir.nr].changed = damage;
2034 changed += damage;
2035 dir.nr++;
2036 }
2037
2038 /* This can happen even with many files, if everything was renames */
2039 if (!changed)
2040 return;
2041
2042 /* Show all directories with more than x% of the changes */
2043 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
2044 gather_dirstat(options, &dir, changed, "", 0);
2045 }
2046
2047 static void free_diffstat_info(struct diffstat_t *diffstat)
2048 {
2049 int i;
2050 for (i = 0; i < diffstat->nr; i++) {
2051 struct diffstat_file *f = diffstat->files[i];
2052 if (f->name != f->print_name)
2053 free(f->print_name);
2054 free(f->name);
2055 free(f->from_name);
2056 free(f);
2057 }
2058 free(diffstat->files);
2059 }
2060
2061 struct checkdiff_t {
2062 const char *filename;
2063 int lineno;
2064 int conflict_marker_size;
2065 struct diff_options *o;
2066 unsigned ws_rule;
2067 unsigned status;
2068 };
2069
2070 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
2071 {
2072 char firstchar;
2073 int cnt;
2074
2075 if (len < marker_size + 1)
2076 return 0;
2077 firstchar = line[0];
2078 switch (firstchar) {
2079 case '=': case '>': case '<': case '|':
2080 break;
2081 default:
2082 return 0;
2083 }
2084 for (cnt = 1; cnt < marker_size; cnt++)
2085 if (line[cnt] != firstchar)
2086 return 0;
2087 /* line[1] thru line[marker_size-1] are same as firstchar */
2088 if (len < marker_size + 1 || !isspace(line[marker_size]))
2089 return 0;
2090 return 1;
2091 }
2092
2093 static void checkdiff_consume(void *priv, char *line, unsigned long len)
2094 {
2095 struct checkdiff_t *data = priv;
2096 int marker_size = data->conflict_marker_size;
2097 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
2098 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
2099 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
2100 char *err;
2101 const char *line_prefix;
2102
2103 assert(data->o);
2104 line_prefix = diff_line_prefix(data->o);
2105
2106 if (line[0] == '+') {
2107 unsigned bad;
2108 data->lineno++;
2109 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
2110 data->status |= 1;
2111 fprintf(data->o->file,
2112 "%s%s:%d: leftover conflict marker\n",
2113 line_prefix, data->filename, data->lineno);
2114 }
2115 bad = ws_check(line + 1, len - 1, data->ws_rule);
2116 if (!bad)
2117 return;
2118 data->status |= bad;
2119 err = whitespace_error_string(bad);
2120 fprintf(data->o->file, "%s%s:%d: %s.\n",
2121 line_prefix, data->filename, data->lineno, err);
2122 free(err);
2123 emit_line(data->o, set, reset, line, 1);
2124 ws_check_emit(line + 1, len - 1, data->ws_rule,
2125 data->o->file, set, reset, ws);
2126 } else if (line[0] == ' ') {
2127 data->lineno++;
2128 } else if (line[0] == '@') {
2129 char *plus = strchr(line, '+');
2130 if (plus)
2131 data->lineno = strtol(plus, NULL, 10) - 1;
2132 else
2133 die("invalid diff");
2134 }
2135 }
2136
2137 static unsigned char *deflate_it(char *data,
2138 unsigned long size,
2139 unsigned long *result_size)
2140 {
2141 int bound;
2142 unsigned char *deflated;
2143 git_zstream stream;
2144
2145 git_deflate_init(&stream, zlib_compression_level);
2146 bound = git_deflate_bound(&stream, size);
2147 deflated = xmalloc(bound);
2148 stream.next_out = deflated;
2149 stream.avail_out = bound;
2150
2151 stream.next_in = (unsigned char *)data;
2152 stream.avail_in = size;
2153 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2154 ; /* nothing */
2155 git_deflate_end(&stream);
2156 *result_size = stream.total_out;
2157 return deflated;
2158 }
2159
2160 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two,
2161 const char *prefix)
2162 {
2163 void *cp;
2164 void *delta;
2165 void *deflated;
2166 void *data;
2167 unsigned long orig_size;
2168 unsigned long delta_size;
2169 unsigned long deflate_size;
2170 unsigned long data_size;
2171
2172 /* We could do deflated delta, or we could do just deflated two,
2173 * whichever is smaller.
2174 */
2175 delta = NULL;
2176 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2177 if (one->size && two->size) {
2178 delta = diff_delta(one->ptr, one->size,
2179 two->ptr, two->size,
2180 &delta_size, deflate_size);
2181 if (delta) {
2182 void *to_free = delta;
2183 orig_size = delta_size;
2184 delta = deflate_it(delta, delta_size, &delta_size);
2185 free(to_free);
2186 }
2187 }
2188
2189 if (delta && delta_size < deflate_size) {
2190 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2191 free(deflated);
2192 data = delta;
2193 data_size = delta_size;
2194 }
2195 else {
2196 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2197 free(delta);
2198 data = deflated;
2199 data_size = deflate_size;
2200 }
2201
2202 /* emit data encoded in base85 */
2203 cp = data;
2204 while (data_size) {
2205 int bytes = (52 < data_size) ? 52 : data_size;
2206 char line[70];
2207 data_size -= bytes;
2208 if (bytes <= 26)
2209 line[0] = bytes + 'A' - 1;
2210 else
2211 line[0] = bytes - 26 + 'a' - 1;
2212 encode_85(line + 1, cp, bytes);
2213 cp = (char *) cp + bytes;
2214 fprintf(file, "%s", prefix);
2215 fputs(line, file);
2216 fputc('\n', file);
2217 }
2218 fprintf(file, "%s\n", prefix);
2219 free(data);
2220 }
2221
2222 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two,
2223 const char *prefix)
2224 {
2225 fprintf(file, "%sGIT binary patch\n", prefix);
2226 emit_binary_diff_body(file, one, two, prefix);
2227 emit_binary_diff_body(file, two, one, prefix);
2228 }
2229
2230 int diff_filespec_is_binary(struct diff_filespec *one)
2231 {
2232 if (one->is_binary == -1) {
2233 diff_filespec_load_driver(one);
2234 if (one->driver->binary != -1)
2235 one->is_binary = one->driver->binary;
2236 else {
2237 if (!one->data && DIFF_FILE_VALID(one))
2238 diff_populate_filespec(one, CHECK_BINARY);
2239 if (one->is_binary == -1 && one->data)
2240 one->is_binary = buffer_is_binary(one->data,
2241 one->size);
2242 if (one->is_binary == -1)
2243 one->is_binary = 0;
2244 }
2245 }
2246 return one->is_binary;
2247 }
2248
2249 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2250 {
2251 diff_filespec_load_driver(one);
2252 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2253 }
2254
2255 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2256 {
2257 if (!options->a_prefix)
2258 options->a_prefix = a;
2259 if (!options->b_prefix)
2260 options->b_prefix = b;
2261 }
2262
2263 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2264 {
2265 if (!DIFF_FILE_VALID(one))
2266 return NULL;
2267
2268 diff_filespec_load_driver(one);
2269 return userdiff_get_textconv(one->driver);
2270 }
2271
2272 static void builtin_diff(const char *name_a,
2273 const char *name_b,
2274 struct diff_filespec *one,
2275 struct diff_filespec *two,
2276 const char *xfrm_msg,
2277 int must_show_header,
2278 struct diff_options *o,
2279 int complete_rewrite)
2280 {
2281 mmfile_t mf1, mf2;
2282 const char *lbl[2];
2283 char *a_one, *b_two;
2284 const char *meta = diff_get_color_opt(o, DIFF_METAINFO);
2285 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2286 const char *a_prefix, *b_prefix;
2287 struct userdiff_driver *textconv_one = NULL;
2288 struct userdiff_driver *textconv_two = NULL;
2289 struct strbuf header = STRBUF_INIT;
2290 const char *line_prefix = diff_line_prefix(o);
2291
2292 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2293 (!one->mode || S_ISGITLINK(one->mode)) &&
2294 (!two->mode || S_ISGITLINK(two->mode))) {
2295 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2296 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2297 show_submodule_summary(o->file, one->path ? one->path : two->path,
2298 line_prefix,
2299 one->oid.hash, two->oid.hash,
2300 two->dirty_submodule,
2301 meta, del, add, reset);
2302 return;
2303 }
2304
2305 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2306 textconv_one = get_textconv(one);
2307 textconv_two = get_textconv(two);
2308 }
2309
2310 diff_set_mnemonic_prefix(o, "a/", "b/");
2311 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2312 a_prefix = o->b_prefix;
2313 b_prefix = o->a_prefix;
2314 } else {
2315 a_prefix = o->a_prefix;
2316 b_prefix = o->b_prefix;
2317 }
2318
2319 /* Never use a non-valid filename anywhere if at all possible */
2320 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2321 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2322
2323 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2324 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2325 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2326 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2327 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, meta, a_one, b_two, reset);
2328 if (lbl[0][0] == '/') {
2329 /* /dev/null */
2330 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
2331 if (xfrm_msg)
2332 strbuf_addstr(&header, xfrm_msg);
2333 must_show_header = 1;
2334 }
2335 else if (lbl[1][0] == '/') {
2336 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
2337 if (xfrm_msg)
2338 strbuf_addstr(&header, xfrm_msg);
2339 must_show_header = 1;
2340 }
2341 else {
2342 if (one->mode != two->mode) {
2343 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
2344 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
2345 must_show_header = 1;
2346 }
2347 if (xfrm_msg)
2348 strbuf_addstr(&header, xfrm_msg);
2349
2350 /*
2351 * we do not run diff between different kind
2352 * of objects.
2353 */
2354 if ((one->mode ^ two->mode) & S_IFMT)
2355 goto free_ab_and_return;
2356 if (complete_rewrite &&
2357 (textconv_one || !diff_filespec_is_binary(one)) &&
2358 (textconv_two || !diff_filespec_is_binary(two))) {
2359 fprintf(o->file, "%s", header.buf);
2360 strbuf_reset(&header);
2361 emit_rewrite_diff(name_a, name_b, one, two,
2362 textconv_one, textconv_two, o);
2363 o->found_changes = 1;
2364 goto free_ab_and_return;
2365 }
2366 }
2367
2368 if (o->irreversible_delete && lbl[1][0] == '/') {
2369 fprintf(o->file, "%s", header.buf);
2370 strbuf_reset(&header);
2371 goto free_ab_and_return;
2372 } else if (!DIFF_OPT_TST(o, TEXT) &&
2373 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2374 (!textconv_two && diff_filespec_is_binary(two)) )) {
2375 if (!one->data && !two->data &&
2376 S_ISREG(one->mode) && S_ISREG(two->mode) &&
2377 !DIFF_OPT_TST(o, BINARY)) {
2378 if (!oidcmp(&one->oid, &two->oid)) {
2379 if (must_show_header)
2380 fprintf(o->file, "%s", header.buf);
2381 goto free_ab_and_return;
2382 }
2383 fprintf(o->file, "%s", header.buf);
2384 fprintf(o->file, "%sBinary files %s and %s differ\n",
2385 line_prefix, lbl[0], lbl[1]);
2386 goto free_ab_and_return;
2387 }
2388 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2389 die("unable to read files to diff");
2390 /* Quite common confusing case */
2391 if (mf1.size == mf2.size &&
2392 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2393 if (must_show_header)
2394 fprintf(o->file, "%s", header.buf);
2395 goto free_ab_and_return;
2396 }
2397 fprintf(o->file, "%s", header.buf);
2398 strbuf_reset(&header);
2399 if (DIFF_OPT_TST(o, BINARY))
2400 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2401 else
2402 fprintf(o->file, "%sBinary files %s and %s differ\n",
2403 line_prefix, lbl[0], lbl[1]);
2404 o->found_changes = 1;
2405 } else {
2406 /* Crazy xdl interfaces.. */
2407 const char *diffopts = getenv("GIT_DIFF_OPTS");
2408 const char *v;
2409 xpparam_t xpp;
2410 xdemitconf_t xecfg;
2411 struct emit_callback ecbdata;
2412 const struct userdiff_funcname *pe;
2413
2414 if (must_show_header) {
2415 fprintf(o->file, "%s", header.buf);
2416 strbuf_reset(&header);
2417 }
2418
2419 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2420 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2421
2422 pe = diff_funcname_pattern(one);
2423 if (!pe)
2424 pe = diff_funcname_pattern(two);
2425
2426 memset(&xpp, 0, sizeof(xpp));
2427 memset(&xecfg, 0, sizeof(xecfg));
2428 memset(&ecbdata, 0, sizeof(ecbdata));
2429 ecbdata.label_path = lbl;
2430 ecbdata.color_diff = want_color(o->use_color);
2431 ecbdata.ws_rule = whitespace_rule(name_b);
2432 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2433 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2434 ecbdata.opt = o;
2435 ecbdata.header = header.len ? &header : NULL;
2436 xpp.flags = o->xdl_opts;
2437 xecfg.ctxlen = o->context;
2438 xecfg.interhunkctxlen = o->interhunkcontext;
2439 xecfg.flags = XDL_EMIT_FUNCNAMES;
2440 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2441 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2442 if (pe)
2443 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2444 if (!diffopts)
2445 ;
2446 else if (skip_prefix(diffopts, "--unified=", &v))
2447 xecfg.ctxlen = strtoul(v, NULL, 10);
2448 else if (skip_prefix(diffopts, "-u", &v))
2449 xecfg.ctxlen = strtoul(v, NULL, 10);
2450 if (o->word_diff)
2451 init_diff_words_data(&ecbdata, o, one, two);
2452 if (xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2453 &xpp, &xecfg))
2454 die("unable to generate diff for %s", one->path);
2455 if (o->word_diff)
2456 free_diff_words_data(&ecbdata);
2457 if (textconv_one)
2458 free(mf1.ptr);
2459 if (textconv_two)
2460 free(mf2.ptr);
2461 xdiff_clear_find_func(&xecfg);
2462 }
2463
2464 free_ab_and_return:
2465 strbuf_release(&header);
2466 diff_free_filespec_data(one);
2467 diff_free_filespec_data(two);
2468 free(a_one);
2469 free(b_two);
2470 return;
2471 }
2472
2473 static void builtin_diffstat(const char *name_a, const char *name_b,
2474 struct diff_filespec *one,
2475 struct diff_filespec *two,
2476 struct diffstat_t *diffstat,
2477 struct diff_options *o,
2478 struct diff_filepair *p)
2479 {
2480 mmfile_t mf1, mf2;
2481 struct diffstat_file *data;
2482 int same_contents;
2483 int complete_rewrite = 0;
2484
2485 if (!DIFF_PAIR_UNMERGED(p)) {
2486 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2487 complete_rewrite = 1;
2488 }
2489
2490 data = diffstat_add(diffstat, name_a, name_b);
2491 data->is_interesting = p->status != DIFF_STATUS_UNKNOWN;
2492
2493 if (!one || !two) {
2494 data->is_unmerged = 1;
2495 return;
2496 }
2497
2498 same_contents = !oidcmp(&one->oid, &two->oid);
2499
2500 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2501 data->is_binary = 1;
2502 if (same_contents) {
2503 data->added = 0;
2504 data->deleted = 0;
2505 } else {
2506 data->added = diff_filespec_size(two);
2507 data->deleted = diff_filespec_size(one);
2508 }
2509 }
2510
2511 else if (complete_rewrite) {
2512 diff_populate_filespec(one, 0);
2513 diff_populate_filespec(two, 0);
2514 data->deleted = count_lines(one->data, one->size);
2515 data->added = count_lines(two->data, two->size);
2516 }
2517
2518 else if (!same_contents) {
2519 /* Crazy xdl interfaces.. */
2520 xpparam_t xpp;
2521 xdemitconf_t xecfg;
2522
2523 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2524 die("unable to read files to diff");
2525
2526 memset(&xpp, 0, sizeof(xpp));
2527 memset(&xecfg, 0, sizeof(xecfg));
2528 xpp.flags = o->xdl_opts;
2529 xecfg.ctxlen = o->context;
2530 xecfg.interhunkctxlen = o->interhunkcontext;
2531 if (xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2532 &xpp, &xecfg))
2533 die("unable to generate diffstat for %s", one->path);
2534 }
2535
2536 diff_free_filespec_data(one);
2537 diff_free_filespec_data(two);
2538 }
2539
2540 static void builtin_checkdiff(const char *name_a, const char *name_b,
2541 const char *attr_path,
2542 struct diff_filespec *one,
2543 struct diff_filespec *two,
2544 struct diff_options *o)
2545 {
2546 mmfile_t mf1, mf2;
2547 struct checkdiff_t data;
2548
2549 if (!two)
2550 return;
2551
2552 memset(&data, 0, sizeof(data));
2553 data.filename = name_b ? name_b : name_a;
2554 data.lineno = 0;
2555 data.o = o;
2556 data.ws_rule = whitespace_rule(attr_path);
2557 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2558
2559 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2560 die("unable to read files to diff");
2561
2562 /*
2563 * All the other codepaths check both sides, but not checking
2564 * the "old" side here is deliberate. We are checking the newly
2565 * introduced changes, and as long as the "new" side is text, we
2566 * can and should check what it introduces.
2567 */
2568 if (diff_filespec_is_binary(two))
2569 goto free_and_return;
2570 else {
2571 /* Crazy xdl interfaces.. */
2572 xpparam_t xpp;
2573 xdemitconf_t xecfg;
2574
2575 memset(&xpp, 0, sizeof(xpp));
2576 memset(&xecfg, 0, sizeof(xecfg));
2577 xecfg.ctxlen = 1; /* at least one context line */
2578 xpp.flags = 0;
2579 if (xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2580 &xpp, &xecfg))
2581 die("unable to generate checkdiff for %s", one->path);
2582
2583 if (data.ws_rule & WS_BLANK_AT_EOF) {
2584 struct emit_callback ecbdata;
2585 int blank_at_eof;
2586
2587 ecbdata.ws_rule = data.ws_rule;
2588 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2589 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2590
2591 if (blank_at_eof) {
2592 static char *err;
2593 if (!err)
2594 err = whitespace_error_string(WS_BLANK_AT_EOF);
2595 fprintf(o->file, "%s:%d: %s.\n",
2596 data.filename, blank_at_eof, err);
2597 data.status = 1; /* report errors */
2598 }
2599 }
2600 }
2601 free_and_return:
2602 diff_free_filespec_data(one);
2603 diff_free_filespec_data(two);
2604 if (data.status)
2605 DIFF_OPT_SET(o, CHECK_FAILED);
2606 }
2607
2608 struct diff_filespec *alloc_filespec(const char *path)
2609 {
2610 struct diff_filespec *spec;
2611
2612 FLEXPTR_ALLOC_STR(spec, path, path);
2613 spec->count = 1;
2614 spec->is_binary = -1;
2615 return spec;
2616 }
2617
2618 void free_filespec(struct diff_filespec *spec)
2619 {
2620 if (!--spec->count) {
2621 diff_free_filespec_data(spec);
2622 free(spec);
2623 }
2624 }
2625
2626 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2627 int sha1_valid, unsigned short mode)
2628 {
2629 if (mode) {
2630 spec->mode = canon_mode(mode);
2631 hashcpy(spec->oid.hash, sha1);
2632 spec->oid_valid = sha1_valid;
2633 }
2634 }
2635
2636 /*
2637 * Given a name and sha1 pair, if the index tells us the file in
2638 * the work tree has that object contents, return true, so that
2639 * prepare_temp_file() does not have to inflate and extract.
2640 */
2641 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2642 {
2643 const struct cache_entry *ce;
2644 struct stat st;
2645 int pos, len;
2646
2647 /*
2648 * We do not read the cache ourselves here, because the
2649 * benchmark with my previous version that always reads cache
2650 * shows that it makes things worse for diff-tree comparing
2651 * two linux-2.6 kernel trees in an already checked out work
2652 * tree. This is because most diff-tree comparisons deal with
2653 * only a small number of files, while reading the cache is
2654 * expensive for a large project, and its cost outweighs the
2655 * savings we get by not inflating the object to a temporary
2656 * file. Practically, this code only helps when we are used
2657 * by diff-cache --cached, which does read the cache before
2658 * calling us.
2659 */
2660 if (!active_cache)
2661 return 0;
2662
2663 /* We want to avoid the working directory if our caller
2664 * doesn't need the data in a normal file, this system
2665 * is rather slow with its stat/open/mmap/close syscalls,
2666 * and the object is contained in a pack file. The pack
2667 * is probably already open and will be faster to obtain
2668 * the data through than the working directory. Loose
2669 * objects however would tend to be slower as they need
2670 * to be individually opened and inflated.
2671 */
2672 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2673 return 0;
2674
2675 /*
2676 * Similarly, if we'd have to convert the file contents anyway, that
2677 * makes the optimization not worthwhile.
2678 */
2679 if (!want_file && would_convert_to_git(name))
2680 return 0;
2681
2682 len = strlen(name);
2683 pos = cache_name_pos(name, len);
2684 if (pos < 0)
2685 return 0;
2686 ce = active_cache[pos];
2687
2688 /*
2689 * This is not the sha1 we are looking for, or
2690 * unreusable because it is not a regular file.
2691 */
2692 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2693 return 0;
2694
2695 /*
2696 * If ce is marked as "assume unchanged", there is no
2697 * guarantee that work tree matches what we are looking for.
2698 */
2699 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2700 return 0;
2701
2702 /*
2703 * If ce matches the file in the work tree, we can reuse it.
2704 */
2705 if (ce_uptodate(ce) ||
2706 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2707 return 1;
2708
2709 return 0;
2710 }
2711
2712 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2713 {
2714 struct strbuf buf = STRBUF_INIT;
2715 char *dirty = "";
2716
2717 /* Are we looking at the work tree? */
2718 if (s->dirty_submodule)
2719 dirty = "-dirty";
2720
2721 strbuf_addf(&buf, "Subproject commit %s%s\n",
2722 oid_to_hex(&s->oid), dirty);
2723 s->size = buf.len;
2724 if (size_only) {
2725 s->data = NULL;
2726 strbuf_release(&buf);
2727 } else {
2728 s->data = strbuf_detach(&buf, NULL);
2729 s->should_free = 1;
2730 }
2731 return 0;
2732 }
2733
2734 /*
2735 * While doing rename detection and pickaxe operation, we may need to
2736 * grab the data for the blob (or file) for our own in-core comparison.
2737 * diff_filespec has data and size fields for this purpose.
2738 */
2739 int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
2740 {
2741 int size_only = flags & CHECK_SIZE_ONLY;
2742 int err = 0;
2743 /*
2744 * demote FAIL to WARN to allow inspecting the situation
2745 * instead of refusing.
2746 */
2747 enum safe_crlf crlf_warn = (safe_crlf == SAFE_CRLF_FAIL
2748 ? SAFE_CRLF_WARN
2749 : safe_crlf);
2750
2751 if (!DIFF_FILE_VALID(s))
2752 die("internal error: asking to populate invalid file.");
2753 if (S_ISDIR(s->mode))
2754 return -1;
2755
2756 if (s->data)
2757 return 0;
2758
2759 if (size_only && 0 < s->size)
2760 return 0;
2761
2762 if (S_ISGITLINK(s->mode))
2763 return diff_populate_gitlink(s, size_only);
2764
2765 if (!s->oid_valid ||
2766 reuse_worktree_file(s->path, s->oid.hash, 0)) {
2767 struct strbuf buf = STRBUF_INIT;
2768 struct stat st;
2769 int fd;
2770
2771 if (lstat(s->path, &st) < 0) {
2772 if (errno == ENOENT) {
2773 err_empty:
2774 err = -1;
2775 empty:
2776 s->data = (char *)"";
2777 s->size = 0;
2778 return err;
2779 }
2780 }
2781 s->size = xsize_t(st.st_size);
2782 if (!s->size)
2783 goto empty;
2784 if (S_ISLNK(st.st_mode)) {
2785 struct strbuf sb = STRBUF_INIT;
2786
2787 if (strbuf_readlink(&sb, s->path, s->size))
2788 goto err_empty;
2789 s->size = sb.len;
2790 s->data = strbuf_detach(&sb, NULL);
2791 s->should_free = 1;
2792 return 0;
2793 }
2794 if (size_only)
2795 return 0;
2796 if ((flags & CHECK_BINARY) &&
2797 s->size > big_file_threshold && s->is_binary == -1) {
2798 s->is_binary = 1;
2799 return 0;
2800 }
2801 fd = open(s->path, O_RDONLY);
2802 if (fd < 0)
2803 goto err_empty;
2804 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2805 close(fd);
2806 s->should_munmap = 1;
2807
2808 /*
2809 * Convert from working tree format to canonical git format
2810 */
2811 if (convert_to_git(s->path, s->data, s->size, &buf, crlf_warn)) {
2812 size_t size = 0;
2813 munmap(s->data, s->size);
2814 s->should_munmap = 0;
2815 s->data = strbuf_detach(&buf, &size);
2816 s->size = size;
2817 s->should_free = 1;
2818 }
2819 }
2820 else {
2821 enum object_type type;
2822 if (size_only || (flags & CHECK_BINARY)) {
2823 type = sha1_object_info(s->oid.hash, &s->size);
2824 if (type < 0)
2825 die("unable to read %s",
2826 oid_to_hex(&s->oid));
2827 if (size_only)
2828 return 0;
2829 if (s->size > big_file_threshold && s->is_binary == -1) {
2830 s->is_binary = 1;
2831 return 0;
2832 }
2833 }
2834 s->data = read_sha1_file(s->oid.hash, &type, &s->size);
2835 if (!s->data)
2836 die("unable to read %s", oid_to_hex(&s->oid));
2837 s->should_free = 1;
2838 }
2839 return 0;
2840 }
2841
2842 void diff_free_filespec_blob(struct diff_filespec *s)
2843 {
2844 if (s->should_free)
2845 free(s->data);
2846 else if (s->should_munmap)
2847 munmap(s->data, s->size);
2848
2849 if (s->should_free || s->should_munmap) {
2850 s->should_free = s->should_munmap = 0;
2851 s->data = NULL;
2852 }
2853 }
2854
2855 void diff_free_filespec_data(struct diff_filespec *s)
2856 {
2857 diff_free_filespec_blob(s);
2858 free(s->cnt_data);
2859 s->cnt_data = NULL;
2860 }
2861
2862 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2863 void *blob,
2864 unsigned long size,
2865 const struct object_id *oid,
2866 int mode)
2867 {
2868 int fd;
2869 struct strbuf buf = STRBUF_INIT;
2870 struct strbuf template = STRBUF_INIT;
2871 char *path_dup = xstrdup(path);
2872 const char *base = basename(path_dup);
2873
2874 /* Generate "XXXXXX_basename.ext" */
2875 strbuf_addstr(&template, "XXXXXX_");
2876 strbuf_addstr(&template, base);
2877
2878 fd = mks_tempfile_ts(&temp->tempfile, template.buf, strlen(base) + 1);
2879 if (fd < 0)
2880 die_errno("unable to create temp-file");
2881 if (convert_to_working_tree(path,
2882 (const char *)blob, (size_t)size, &buf)) {
2883 blob = buf.buf;
2884 size = buf.len;
2885 }
2886 if (write_in_full(fd, blob, size) != size)
2887 die_errno("unable to write temp-file");
2888 close_tempfile(&temp->tempfile);
2889 temp->name = get_tempfile_path(&temp->tempfile);
2890 oid_to_hex_r(temp->hex, oid);
2891 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", mode);
2892 strbuf_release(&buf);
2893 strbuf_release(&template);
2894 free(path_dup);
2895 }
2896
2897 static struct diff_tempfile *prepare_temp_file(const char *name,
2898 struct diff_filespec *one)
2899 {
2900 struct diff_tempfile *temp = claim_diff_tempfile();
2901
2902 if (!DIFF_FILE_VALID(one)) {
2903 not_a_valid_file:
2904 /* A '-' entry produces this for file-2, and
2905 * a '+' entry produces this for file-1.
2906 */
2907 temp->name = "/dev/null";
2908 xsnprintf(temp->hex, sizeof(temp->hex), ".");
2909 xsnprintf(temp->mode, sizeof(temp->mode), ".");
2910 return temp;
2911 }
2912
2913 if (!S_ISGITLINK(one->mode) &&
2914 (!one->oid_valid ||
2915 reuse_worktree_file(name, one->oid.hash, 1))) {
2916 struct stat st;
2917 if (lstat(name, &st) < 0) {
2918 if (errno == ENOENT)
2919 goto not_a_valid_file;
2920 die_errno("stat(%s)", name);
2921 }
2922 if (S_ISLNK(st.st_mode)) {
2923 struct strbuf sb = STRBUF_INIT;
2924 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2925 die_errno("readlink(%s)", name);
2926 prep_temp_blob(name, temp, sb.buf, sb.len,
2927 (one->oid_valid ?
2928 &one->oid : &null_oid),
2929 (one->oid_valid ?
2930 one->mode : S_IFLNK));
2931 strbuf_release(&sb);
2932 }
2933 else {
2934 /* we can borrow from the file in the work tree */
2935 temp->name = name;
2936 if (!one->oid_valid)
2937 sha1_to_hex_r(temp->hex, null_sha1);
2938 else
2939 sha1_to_hex_r(temp->hex, one->oid.hash);
2940 /* Even though we may sometimes borrow the
2941 * contents from the work tree, we always want
2942 * one->mode. mode is trustworthy even when
2943 * !(one->sha1_valid), as long as
2944 * DIFF_FILE_VALID(one).
2945 */
2946 xsnprintf(temp->mode, sizeof(temp->mode), "%06o", one->mode);
2947 }
2948 return temp;
2949 }
2950 else {
2951 if (diff_populate_filespec(one, 0))
2952 die("cannot read data blob for %s", one->path);
2953 prep_temp_blob(name, temp, one->data, one->size,
2954 &one->oid, one->mode);
2955 }
2956 return temp;
2957 }
2958
2959 static void add_external_diff_name(struct argv_array *argv,
2960 const char *name,
2961 struct diff_filespec *df)
2962 {
2963 struct diff_tempfile *temp = prepare_temp_file(name, df);
2964 argv_array_push(argv, temp->name);
2965 argv_array_push(argv, temp->hex);
2966 argv_array_push(argv, temp->mode);
2967 }
2968
2969 /* An external diff command takes:
2970 *
2971 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2972 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2973 *
2974 */
2975 static void run_external_diff(const char *pgm,
2976 const char *name,
2977 const char *other,
2978 struct diff_filespec *one,
2979 struct diff_filespec *two,
2980 const char *xfrm_msg,
2981 int complete_rewrite,
2982 struct diff_options *o)
2983 {
2984 struct argv_array argv = ARGV_ARRAY_INIT;
2985 struct argv_array env = ARGV_ARRAY_INIT;
2986 struct diff_queue_struct *q = &diff_queued_diff;
2987
2988 argv_array_push(&argv, pgm);
2989 argv_array_push(&argv, name);
2990
2991 if (one && two) {
2992 add_external_diff_name(&argv, name, one);
2993 if (!other)
2994 add_external_diff_name(&argv, name, two);
2995 else {
2996 add_external_diff_name(&argv, other, two);
2997 argv_array_push(&argv, other);
2998 argv_array_push(&argv, xfrm_msg);
2999 }
3000 }
3001
3002 argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
3003 argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
3004
3005 if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
3006 die(_("external diff died, stopping at %s"), name);
3007
3008 remove_tempfile();
3009 argv_array_clear(&argv);
3010 argv_array_clear(&env);
3011 }
3012
3013 static int similarity_index(struct diff_filepair *p)
3014 {
3015 return p->score * 100 / MAX_SCORE;
3016 }
3017
3018 static void fill_metainfo(struct strbuf *msg,
3019 const char *name,
3020 const char *other,
3021 struct diff_filespec *one,
3022 struct diff_filespec *two,
3023 struct diff_options *o,
3024 struct diff_filepair *p,
3025 int *must_show_header,
3026 int use_color)
3027 {
3028 const char *set = diff_get_color(use_color, DIFF_METAINFO);
3029 const char *reset = diff_get_color(use_color, DIFF_RESET);
3030 const char *line_prefix = diff_line_prefix(o);
3031
3032 *must_show_header = 1;
3033 strbuf_init(msg, PATH_MAX * 2 + 300);
3034 switch (p->status) {
3035 case DIFF_STATUS_COPIED:
3036 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3037 line_prefix, set, similarity_index(p));
3038 strbuf_addf(msg, "%s\n%s%scopy from ",
3039 reset, line_prefix, set);
3040 quote_c_style(name, msg, NULL, 0);
3041 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
3042 quote_c_style(other, msg, NULL, 0);
3043 strbuf_addf(msg, "%s\n", reset);
3044 break;
3045 case DIFF_STATUS_RENAMED:
3046 strbuf_addf(msg, "%s%ssimilarity index %d%%",
3047 line_prefix, set, similarity_index(p));
3048 strbuf_addf(msg, "%s\n%s%srename from ",
3049 reset, line_prefix, set);
3050 quote_c_style(name, msg, NULL, 0);
3051 strbuf_addf(msg, "%s\n%s%srename to ",
3052 reset, line_prefix, set);
3053 quote_c_style(other, msg, NULL, 0);
3054 strbuf_addf(msg, "%s\n", reset);
3055 break;
3056 case DIFF_STATUS_MODIFIED:
3057 if (p->score) {
3058 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
3059 line_prefix,
3060 set, similarity_index(p), reset);
3061 break;
3062 }
3063 /* fallthru */
3064 default:
3065 *must_show_header = 0;
3066 }
3067 if (one && two && oidcmp(&one->oid, &two->oid)) {
3068 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
3069
3070 if (DIFF_OPT_TST(o, BINARY)) {
3071 mmfile_t mf;
3072 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
3073 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
3074 abbrev = 40;
3075 }
3076 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3077 find_unique_abbrev(one->oid.hash, abbrev));
3078 strbuf_addstr(msg, find_unique_abbrev(two->oid.hash, abbrev));
3079 if (one->mode == two->mode)
3080 strbuf_addf(msg, " %06o", one->mode);
3081 strbuf_addf(msg, "%s\n", reset);
3082 }
3083 }
3084
3085 static void run_diff_cmd(const char *pgm,
3086 const char *name,
3087 const char *other,
3088 const char *attr_path,
3089 struct diff_filespec *one,
3090 struct diff_filespec *two,
3091 struct strbuf *msg,
3092 struct diff_options *o,
3093 struct diff_filepair *p)
3094 {
3095 const char *xfrm_msg = NULL;
3096 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
3097 int must_show_header = 0;
3098
3099
3100 if (DIFF_OPT_TST(o, ALLOW_EXTERNAL)) {
3101 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
3102 if (drv && drv->external)
3103 pgm = drv->external;
3104 }
3105
3106 if (msg) {
3107 /*
3108 * don't use colors when the header is intended for an
3109 * external diff driver
3110 */
3111 fill_metainfo(msg, name, other, one, two, o, p,
3112 &must_show_header,
3113 want_color(o->use_color) && !pgm);
3114 xfrm_msg = msg->len ? msg->buf : NULL;
3115 }
3116
3117 if (pgm) {
3118 run_external_diff(pgm, name, other, one, two, xfrm_msg,
3119 complete_rewrite, o);
3120 return;
3121 }
3122 if (one && two)
3123 builtin_diff(name, other ? other : name,
3124 one, two, xfrm_msg, must_show_header,
3125 o, complete_rewrite);
3126 else
3127 fprintf(o->file, "* Unmerged path %s\n", name);
3128 }
3129
3130 static void diff_fill_sha1_info(struct diff_filespec *one)
3131 {
3132 if (DIFF_FILE_VALID(one)) {
3133 if (!one->oid_valid) {
3134 struct stat st;
3135 if (one->is_stdin) {
3136 oidclr(&one->oid);
3137 return;
3138 }
3139 if (lstat(one->path, &st) < 0)
3140 die_errno("stat '%s'", one->path);
3141 if (index_path(one->oid.hash, one->path, &st, 0))
3142 die("cannot hash %s", one->path);
3143 }
3144 }
3145 else
3146 oidclr(&one->oid);
3147 }
3148
3149 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3150 {
3151 /* Strip the prefix but do not molest /dev/null and absolute paths */
3152 if (*namep && **namep != '/') {
3153 *namep += prefix_length;
3154 if (**namep == '/')
3155 ++*namep;
3156 }
3157 if (*otherp && **otherp != '/') {
3158 *otherp += prefix_length;
3159 if (**otherp == '/')
3160 ++*otherp;
3161 }
3162 }
3163
3164 static void run_diff(struct diff_filepair *p, struct diff_options *o)
3165 {
3166 const char *pgm = external_diff();
3167 struct strbuf msg;
3168 struct diff_filespec *one = p->one;
3169 struct diff_filespec *two = p->two;
3170 const char *name;
3171 const char *other;
3172 const char *attr_path;
3173
3174 name = p->one->path;
3175 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3176 attr_path = name;
3177 if (o->prefix_length)
3178 strip_prefix(o->prefix_length, &name, &other);
3179
3180 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
3181 pgm = NULL;
3182
3183 if (DIFF_PAIR_UNMERGED(p)) {
3184 run_diff_cmd(pgm, name, NULL, attr_path,
3185 NULL, NULL, NULL, o, p);
3186 return;
3187 }
3188
3189 diff_fill_sha1_info(one);
3190 diff_fill_sha1_info(two);
3191
3192 if (!pgm &&
3193 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3194 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3195 /*
3196 * a filepair that changes between file and symlink
3197 * needs to be split into deletion and creation.
3198 */
3199 struct diff_filespec *null = alloc_filespec(two->path);
3200 run_diff_cmd(NULL, name, other, attr_path,
3201 one, null, &msg, o, p);
3202 free(null);
3203 strbuf_release(&msg);
3204
3205 null = alloc_filespec(one->path);
3206 run_diff_cmd(NULL, name, other, attr_path,
3207 null, two, &msg, o, p);
3208 free(null);
3209 }
3210 else
3211 run_diff_cmd(pgm, name, other, attr_path,
3212 one, two, &msg, o, p);
3213
3214 strbuf_release(&msg);
3215 }
3216
3217 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3218 struct diffstat_t *diffstat)
3219 {
3220 const char *name;
3221 const char *other;
3222
3223 if (DIFF_PAIR_UNMERGED(p)) {
3224 /* unmerged */
3225 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, p);
3226 return;
3227 }
3228
3229 name = p->one->path;
3230 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3231
3232 if (o->prefix_length)
3233 strip_prefix(o->prefix_length, &name, &other);
3234
3235 diff_fill_sha1_info(p->one);
3236 diff_fill_sha1_info(p->two);
3237
3238 builtin_diffstat(name, other, p->one, p->two, diffstat, o, p);
3239 }
3240
3241 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3242 {
3243 const char *name;
3244 const char *other;
3245 const char *attr_path;
3246
3247 if (DIFF_PAIR_UNMERGED(p)) {
3248 /* unmerged */
3249 return;
3250 }
3251
3252 name = p->one->path;
3253 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3254 attr_path = other ? other : name;
3255
3256 if (o->prefix_length)
3257 strip_prefix(o->prefix_length, &name, &other);
3258
3259 diff_fill_sha1_info(p->one);
3260 diff_fill_sha1_info(p->two);
3261
3262 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3263 }
3264
3265 void diff_setup(struct diff_options *options)
3266 {
3267 memcpy(options, &default_diff_options, sizeof(*options));
3268
3269 options->file = stdout;
3270
3271 options->line_termination = '\n';
3272 options->break_opt = -1;
3273 options->rename_limit = -1;
3274 options->dirstat_permille = diff_dirstat_permille_default;
3275 options->context = diff_context_default;
3276 options->ws_error_highlight = WSEH_NEW;
3277 DIFF_OPT_SET(options, RENAME_EMPTY);
3278
3279 /* pathchange left =NULL by default */
3280 options->change = diff_change;
3281 options->add_remove = diff_addremove;
3282 options->use_color = diff_use_color_default;
3283 options->detect_rename = diff_detect_rename_default;
3284 options->xdl_opts |= diff_algorithm;
3285 if (diff_compaction_heuristic)
3286 DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
3287
3288 options->orderfile = diff_order_file_cfg;
3289
3290 if (diff_no_prefix) {
3291 options->a_prefix = options->b_prefix = "";
3292 } else if (!diff_mnemonic_prefix) {
3293 options->a_prefix = "a/";
3294 options->b_prefix = "b/";
3295 }
3296 }
3297
3298 void diff_setup_done(struct diff_options *options)
3299 {
3300 int count = 0;
3301
3302 if (options->set_default)
3303 options->set_default(options);
3304
3305 if (options->output_format & DIFF_FORMAT_NAME)
3306 count++;
3307 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3308 count++;
3309 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3310 count++;
3311 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3312 count++;
3313 if (count > 1)
3314 die("--name-only, --name-status, --check and -s are mutually exclusive");
3315
3316 /*
3317 * Most of the time we can say "there are changes"
3318 * only by checking if there are changed paths, but
3319 * --ignore-whitespace* options force us to look
3320 * inside contents.
3321 */
3322
3323 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3324 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3325 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3326 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3327 else
3328 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3329
3330 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3331 options->detect_rename = DIFF_DETECT_COPY;
3332
3333 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3334 options->prefix = NULL;
3335 if (options->prefix)
3336 options->prefix_length = strlen(options->prefix);
3337 else
3338 options->prefix_length = 0;
3339
3340 if (options->output_format & (DIFF_FORMAT_NAME |
3341 DIFF_FORMAT_NAME_STATUS |
3342 DIFF_FORMAT_CHECKDIFF |
3343 DIFF_FORMAT_NO_OUTPUT))
3344 options->output_format &= ~(DIFF_FORMAT_RAW |
3345 DIFF_FORMAT_NUMSTAT |
3346 DIFF_FORMAT_DIFFSTAT |
3347 DIFF_FORMAT_SHORTSTAT |
3348 DIFF_FORMAT_DIRSTAT |
3349 DIFF_FORMAT_SUMMARY |
3350 DIFF_FORMAT_PATCH);
3351
3352 /*
3353 * These cases always need recursive; we do not drop caller-supplied
3354 * recursive bits for other formats here.
3355 */
3356 if (options->output_format & (DIFF_FORMAT_PATCH |
3357 DIFF_FORMAT_NUMSTAT |
3358 DIFF_FORMAT_DIFFSTAT |
3359 DIFF_FORMAT_SHORTSTAT |
3360 DIFF_FORMAT_DIRSTAT |
3361 DIFF_FORMAT_SUMMARY |
3362 DIFF_FORMAT_CHECKDIFF))
3363 DIFF_OPT_SET(options, RECURSIVE);
3364 /*
3365 * Also pickaxe would not work very well if you do not say recursive
3366 */
3367 if (options->pickaxe)
3368 DIFF_OPT_SET(options, RECURSIVE);
3369 /*
3370 * When patches are generated, submodules diffed against the work tree
3371 * must be checked for dirtiness too so it can be shown in the output
3372 */
3373 if (options->output_format & DIFF_FORMAT_PATCH)
3374 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3375
3376 if (options->detect_rename && options->rename_limit < 0)
3377 options->rename_limit = diff_rename_limit_default;
3378 if (options->setup & DIFF_SETUP_USE_CACHE) {
3379 if (!active_cache)
3380 /* read-cache does not die even when it fails
3381 * so it is safe for us to do this here. Also
3382 * it does not smudge active_cache or active_nr
3383 * when it fails, so we do not have to worry about
3384 * cleaning it up ourselves either.
3385 */
3386 read_cache();
3387 }
3388 if (options->abbrev <= 0 || 40 < options->abbrev)
3389 options->abbrev = 40; /* full */
3390
3391 /*
3392 * It does not make sense to show the first hit we happened
3393 * to have found. It does not make sense not to return with
3394 * exit code in such a case either.
3395 */
3396 if (DIFF_OPT_TST(options, QUICK)) {
3397 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3398 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3399 }
3400
3401 options->diff_path_counter = 0;
3402
3403 if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
3404 die(_("--follow requires exactly one pathspec"));
3405 }
3406
3407 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3408 {
3409 char c, *eq;
3410 int len;
3411
3412 if (*arg != '-')
3413 return 0;
3414 c = *++arg;
3415 if (!c)
3416 return 0;
3417 if (c == arg_short) {
3418 c = *++arg;
3419 if (!c)
3420 return 1;
3421 if (val && isdigit(c)) {
3422 char *end;
3423 int n = strtoul(arg, &end, 10);
3424 if (*end)
3425 return 0;
3426 *val = n;
3427 return 1;
3428 }
3429 return 0;
3430 }
3431 if (c != '-')
3432 return 0;
3433 arg++;
3434 eq = strchrnul(arg, '=');
3435 len = eq - arg;
3436 if (!len || strncmp(arg, arg_long, len))
3437 return 0;
3438 if (*eq) {
3439 int n;
3440 char *end;
3441 if (!isdigit(*++eq))
3442 return 0;
3443 n = strtoul(eq, &end, 10);
3444 if (*end)
3445 return 0;
3446 *val = n;
3447 }
3448 return 1;
3449 }
3450
3451 static int diff_scoreopt_parse(const char *opt);
3452
3453 static inline int short_opt(char opt, const char **argv,
3454 const char **optarg)
3455 {
3456 const char *arg = argv[0];
3457 if (arg[0] != '-' || arg[1] != opt)
3458 return 0;
3459 if (arg[2] != '\0') {
3460 *optarg = arg + 2;
3461 return 1;
3462 }
3463 if (!argv[1])
3464 die("Option '%c' requires a value", opt);
3465 *optarg = argv[1];
3466 return 2;
3467 }
3468
3469 int parse_long_opt(const char *opt, const char **argv,
3470 const char **optarg)
3471 {
3472 const char *arg = argv[0];
3473 if (!skip_prefix(arg, "--", &arg))
3474 return 0;
3475 if (!skip_prefix(arg, opt, &arg))
3476 return 0;
3477 if (*arg == '=') { /* stuck form: --option=value */
3478 *optarg = arg + 1;
3479 return 1;
3480 }
3481 if (*arg != '\0')
3482 return 0;
3483 /* separate form: --option value */
3484 if (!argv[1])
3485 die("Option '--%s' requires a value", opt);
3486 *optarg = argv[1];
3487 return 2;
3488 }
3489
3490 static int stat_opt(struct diff_options *options, const char **av)
3491 {
3492 const char *arg = av[0];
3493 char *end;
3494 int width = options->stat_width;
3495 int name_width = options->stat_name_width;
3496 int graph_width = options->stat_graph_width;
3497 int count = options->stat_count;
3498 int argcount = 1;
3499
3500 if (!skip_prefix(arg, "--stat", &arg))
3501 die("BUG: stat option does not begin with --stat: %s", arg);
3502 end = (char *)arg;
3503
3504 switch (*arg) {
3505 case '-':
3506 if (skip_prefix(arg, "-width", &arg)) {
3507 if (*arg == '=')
3508 width = strtoul(arg + 1, &end, 10);
3509 else if (!*arg && !av[1])
3510 die("Option '--stat-width' requires a value");
3511 else if (!*arg) {
3512 width = strtoul(av[1], &end, 10);
3513 argcount = 2;
3514 }
3515 } else if (skip_prefix(arg, "-name-width", &arg)) {
3516 if (*arg == '=')
3517 name_width = strtoul(arg + 1, &end, 10);
3518 else if (!*arg && !av[1])
3519 die("Option '--stat-name-width' requires a value");
3520 else if (!*arg) {
3521 name_width = strtoul(av[1], &end, 10);
3522 argcount = 2;
3523 }
3524 } else if (skip_prefix(arg, "-graph-width", &arg)) {
3525 if (*arg == '=')
3526 graph_width = strtoul(arg + 1, &end, 10);
3527 else if (!*arg && !av[1])
3528 die("Option '--stat-graph-width' requires a value");
3529 else if (!*arg) {
3530 graph_width = strtoul(av[1], &end, 10);
3531 argcount = 2;
3532 }
3533 } else if (skip_prefix(arg, "-count", &arg)) {
3534 if (*arg == '=')
3535 count = strtoul(arg + 1, &end, 10);
3536 else if (!*arg && !av[1])
3537 die("Option '--stat-count' requires a value");
3538 else if (!*arg) {
3539 count = strtoul(av[1], &end, 10);
3540 argcount = 2;
3541 }
3542 }
3543 break;
3544 case '=':
3545 width = strtoul(arg+1, &end, 10);
3546 if (*end == ',')
3547 name_width = strtoul(end+1, &end, 10);
3548 if (*end == ',')
3549 count = strtoul(end+1, &end, 10);
3550 }
3551
3552 /* Important! This checks all the error cases! */
3553 if (*end)
3554 return 0;
3555 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3556 options->stat_name_width = name_width;
3557 options->stat_graph_width = graph_width;
3558 options->stat_width = width;
3559 options->stat_count = count;
3560 return argcount;
3561 }
3562
3563 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3564 {
3565 struct strbuf errmsg = STRBUF_INIT;
3566 if (parse_dirstat_params(options, params, &errmsg))
3567 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3568 errmsg.buf);
3569 strbuf_release(&errmsg);
3570 /*
3571 * The caller knows a dirstat-related option is given from the command
3572 * line; allow it to say "return this_function();"
3573 */
3574 options->output_format |= DIFF_FORMAT_DIRSTAT;
3575 return 1;
3576 }
3577
3578 static int parse_submodule_opt(struct diff_options *options, const char *value)
3579 {
3580 if (parse_submodule_params(options, value))
3581 die(_("Failed to parse --submodule option parameter: '%s'"),
3582 value);
3583 return 1;
3584 }
3585
3586 static const char diff_status_letters[] = {
3587 DIFF_STATUS_ADDED,
3588 DIFF_STATUS_COPIED,
3589 DIFF_STATUS_DELETED,
3590 DIFF_STATUS_MODIFIED,
3591 DIFF_STATUS_RENAMED,
3592 DIFF_STATUS_TYPE_CHANGED,
3593 DIFF_STATUS_UNKNOWN,
3594 DIFF_STATUS_UNMERGED,
3595 DIFF_STATUS_FILTER_AON,
3596 DIFF_STATUS_FILTER_BROKEN,
3597 '\0',
3598 };
3599
3600 static unsigned int filter_bit['Z' + 1];
3601
3602 static void prepare_filter_bits(void)
3603 {
3604 int i;
3605
3606 if (!filter_bit[DIFF_STATUS_ADDED]) {
3607 for (i = 0; diff_status_letters[i]; i++)
3608 filter_bit[(int) diff_status_letters[i]] = (1 << i);
3609 }
3610 }
3611
3612 static unsigned filter_bit_tst(char status, const struct diff_options *opt)
3613 {
3614 return opt->filter & filter_bit[(int) status];
3615 }
3616
3617 static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
3618 {
3619 int i, optch;
3620
3621 prepare_filter_bits();
3622
3623 /*
3624 * If there is a negation e.g. 'd' in the input, and we haven't
3625 * initialized the filter field with another --diff-filter, start
3626 * from full set of bits, except for AON.
3627 */
3628 if (!opt->filter) {
3629 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3630 if (optch < 'a' || 'z' < optch)
3631 continue;
3632 opt->filter = (1 << (ARRAY_SIZE(diff_status_letters) - 1)) - 1;
3633 opt->filter &= ~filter_bit[DIFF_STATUS_FILTER_AON];
3634 break;
3635 }
3636 }
3637
3638 for (i = 0; (optch = optarg[i]) != '\0'; i++) {
3639 unsigned int bit;
3640 int negate;
3641
3642 if ('a' <= optch && optch <= 'z') {
3643 negate = 1;
3644 optch = toupper(optch);
3645 } else {
3646 negate = 0;
3647 }
3648
3649 bit = (0 <= optch && optch <= 'Z') ? filter_bit[optch] : 0;
3650 if (!bit)
3651 return optarg[i];
3652 if (negate)
3653 opt->filter &= ~bit;
3654 else
3655 opt->filter |= bit;
3656 }
3657 return 0;
3658 }
3659
3660 static void enable_patch_output(int *fmt) {
3661 *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
3662 *fmt |= DIFF_FORMAT_PATCH;
3663 }
3664
3665 static int parse_one_token(const char **arg, const char *token)
3666 {
3667 const char *rest;
3668 if (skip_prefix(*arg, token, &rest) && (!*rest || *rest == ',')) {
3669 *arg = rest;
3670 return 1;
3671 }
3672 return 0;
3673 }
3674
3675 static int parse_ws_error_highlight(struct diff_options *opt, const char *arg)
3676 {
3677 const char *orig_arg = arg;
3678 unsigned val = 0;
3679 while (*arg) {
3680 if (parse_one_token(&arg, "none"))
3681 val = 0;
3682 else if (parse_one_token(&arg, "default"))
3683 val = WSEH_NEW;
3684 else if (parse_one_token(&arg, "all"))
3685 val = WSEH_NEW | WSEH_OLD | WSEH_CONTEXT;
3686 else if (parse_one_token(&arg, "new"))
3687 val |= WSEH_NEW;
3688 else if (parse_one_token(&arg, "old"))
3689 val |= WSEH_OLD;
3690 else if (parse_one_token(&arg, "context"))
3691 val |= WSEH_CONTEXT;
3692 else {
3693 error("unknown value after ws-error-highlight=%.*s",
3694 (int)(arg - orig_arg), orig_arg);
3695 return 0;
3696 }
3697 if (*arg)
3698 arg++;
3699 }
3700 opt->ws_error_highlight = val;
3701 return 1;
3702 }
3703
3704 int diff_opt_parse(struct diff_options *options,
3705 const char **av, int ac, const char *prefix)
3706 {
3707 const char *arg = av[0];
3708 const char *optarg;
3709 int argcount;
3710
3711 if (!prefix)
3712 prefix = "";
3713
3714 /* Output format options */
3715 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch")
3716 || opt_arg(arg, 'U', "unified", &options->context))
3717 enable_patch_output(&options->output_format);
3718 else if (!strcmp(arg, "--raw"))
3719 options->output_format |= DIFF_FORMAT_RAW;
3720 else if (!strcmp(arg, "--patch-with-raw")) {
3721 enable_patch_output(&options->output_format);
3722 options->output_format |= DIFF_FORMAT_RAW;
3723 } else if (!strcmp(arg, "--numstat"))
3724 options->output_format |= DIFF_FORMAT_NUMSTAT;
3725 else if (!strcmp(arg, "--shortstat"))
3726 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3727 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3728 return parse_dirstat_opt(options, "");
3729 else if (skip_prefix(arg, "-X", &arg))
3730 return parse_dirstat_opt(options, arg);
3731 else if (skip_prefix(arg, "--dirstat=", &arg))
3732 return parse_dirstat_opt(options, arg);
3733 else if (!strcmp(arg, "--cumulative"))
3734 return parse_dirstat_opt(options, "cumulative");
3735 else if (!strcmp(arg, "--dirstat-by-file"))
3736 return parse_dirstat_opt(options, "files");
3737 else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
3738 parse_dirstat_opt(options, "files");
3739 return parse_dirstat_opt(options, arg);
3740 }
3741 else if (!strcmp(arg, "--check"))
3742 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3743 else if (!strcmp(arg, "--summary"))
3744 options->output_format |= DIFF_FORMAT_SUMMARY;
3745 else if (!strcmp(arg, "--patch-with-stat")) {
3746 enable_patch_output(&options->output_format);
3747 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3748 } else if (!strcmp(arg, "--name-only"))
3749 options->output_format |= DIFF_FORMAT_NAME;
3750 else if (!strcmp(arg, "--name-status"))
3751 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3752 else if (!strcmp(arg, "-s") || !strcmp(arg, "--no-patch"))
3753 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3754 else if (starts_with(arg, "--stat"))
3755 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3756 return stat_opt(options, av);
3757
3758 /* renames options */
3759 else if (starts_with(arg, "-B") || starts_with(arg, "--break-rewrites=") ||
3760 !strcmp(arg, "--break-rewrites")) {
3761 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3762 return error("invalid argument to -B: %s", arg+2);
3763 }
3764 else if (starts_with(arg, "-M") || starts_with(arg, "--find-renames=") ||
3765 !strcmp(arg, "--find-renames")) {
3766 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3767 return error("invalid argument to -M: %s", arg+2);
3768 options->detect_rename = DIFF_DETECT_RENAME;
3769 }
3770 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3771 options->irreversible_delete = 1;
3772 }
3773 else if (starts_with(arg, "-C") || starts_with(arg, "--find-copies=") ||
3774 !strcmp(arg, "--find-copies")) {
3775 if (options->detect_rename == DIFF_DETECT_COPY)
3776 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3777 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3778 return error("invalid argument to -C: %s", arg+2);
3779 options->detect_rename = DIFF_DETECT_COPY;
3780 }
3781 else if (!strcmp(arg, "--no-renames"))
3782 options->detect_rename = 0;
3783 else if (!strcmp(arg, "--rename-empty"))
3784 DIFF_OPT_SET(options, RENAME_EMPTY);
3785 else if (!strcmp(arg, "--no-rename-empty"))
3786 DIFF_OPT_CLR(options, RENAME_EMPTY);
3787 else if (!strcmp(arg, "--relative"))
3788 DIFF_OPT_SET(options, RELATIVE_NAME);
3789 else if (skip_prefix(arg, "--relative=", &arg)) {
3790 DIFF_OPT_SET(options, RELATIVE_NAME);
3791 options->prefix = arg;
3792 }
3793
3794 /* xdiff options */
3795 else if (!strcmp(arg, "--minimal"))
3796 DIFF_XDL_SET(options, NEED_MINIMAL);
3797 else if (!strcmp(arg, "--no-minimal"))
3798 DIFF_XDL_CLR(options, NEED_MINIMAL);
3799 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3800 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3801 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3802 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3803 else if (!strcmp(arg, "--ignore-space-at-eol"))
3804 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3805 else if (!strcmp(arg, "--ignore-blank-lines"))
3806 DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
3807 else if (!strcmp(arg, "--compaction-heuristic"))
3808 DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
3809 else if (!strcmp(arg, "--no-compaction-heuristic"))
3810 DIFF_XDL_CLR(options, COMPACTION_HEURISTIC);
3811 else if (!strcmp(arg, "--patience"))
3812 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
3813 else if (!strcmp(arg, "--histogram"))
3814 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
3815 else if ((argcount = parse_long_opt("diff-algorithm", av, &optarg))) {
3816 long value = parse_algorithm_value(optarg);
3817 if (value < 0)
3818 return error("option diff-algorithm accepts \"myers\", "
3819 "\"minimal\", \"patience\" and \"histogram\"");
3820 /* clear out previous settings */
3821 DIFF_XDL_CLR(options, NEED_MINIMAL);
3822 options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
3823 options->xdl_opts |= value;
3824 return argcount;
3825 }
3826
3827 /* flags options */
3828 else if (!strcmp(arg, "--binary")) {
3829 enable_patch_output(&options->output_format);
3830 DIFF_OPT_SET(options, BINARY);
3831 }
3832 else if (!strcmp(arg, "--full-index"))
3833 DIFF_OPT_SET(options, FULL_INDEX);
3834 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3835 DIFF_OPT_SET(options, TEXT);
3836 else if (!strcmp(arg, "-R"))
3837 DIFF_OPT_SET(options, REVERSE_DIFF);
3838 else if (!strcmp(arg, "--find-copies-harder"))
3839 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3840 else if (!strcmp(arg, "--follow"))
3841 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3842 else if (!strcmp(arg, "--no-follow")) {
3843 DIFF_OPT_CLR(options, FOLLOW_RENAMES);
3844 DIFF_OPT_CLR(options, DEFAULT_FOLLOW_RENAMES);
3845 } else if (!strcmp(arg, "--color"))
3846 options->use_color = 1;
3847 else if (skip_prefix(arg, "--color=", &arg)) {
3848 int value = git_config_colorbool(NULL, arg);
3849 if (value < 0)
3850 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3851 options->use_color = value;
3852 }
3853 else if (!strcmp(arg, "--no-color"))
3854 options->use_color = 0;
3855 else if (!strcmp(arg, "--color-words")) {
3856 options->use_color = 1;
3857 options->word_diff = DIFF_WORDS_COLOR;
3858 }
3859 else if (skip_prefix(arg, "--color-words=", &arg)) {
3860 options->use_color = 1;
3861 options->word_diff = DIFF_WORDS_COLOR;
3862 options->word_regex = arg;
3863 }
3864 else if (!strcmp(arg, "--word-diff")) {
3865 if (options->word_diff == DIFF_WORDS_NONE)
3866 options->word_diff = DIFF_WORDS_PLAIN;
3867 }
3868 else if (skip_prefix(arg, "--word-diff=", &arg)) {
3869 if (!strcmp(arg, "plain"))
3870 options->word_diff = DIFF_WORDS_PLAIN;
3871 else if (!strcmp(arg, "color")) {
3872 options->use_color = 1;
3873 options->word_diff = DIFF_WORDS_COLOR;
3874 }
3875 else if (!strcmp(arg, "porcelain"))
3876 options->word_diff = DIFF_WORDS_PORCELAIN;
3877 else if (!strcmp(arg, "none"))
3878 options->word_diff = DIFF_WORDS_NONE;
3879 else
3880 die("bad --word-diff argument: %s", arg);
3881 }
3882 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3883 if (options->word_diff == DIFF_WORDS_NONE)
3884 options->word_diff = DIFF_WORDS_PLAIN;
3885 options->word_regex = optarg;
3886 return argcount;
3887 }
3888 else if (!strcmp(arg, "--exit-code"))
3889 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3890 else if (!strcmp(arg, "--quiet"))
3891 DIFF_OPT_SET(options, QUICK);
3892 else if (!strcmp(arg, "--ext-diff"))
3893 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3894 else if (!strcmp(arg, "--no-ext-diff"))
3895 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3896 else if (!strcmp(arg, "--textconv"))
3897 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3898 else if (!strcmp(arg, "--no-textconv"))
3899 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3900 else if (!strcmp(arg, "--ignore-submodules")) {
3901 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3902 handle_ignore_submodules_arg(options, "all");
3903 } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
3904 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3905 handle_ignore_submodules_arg(options, arg);
3906 } else if (!strcmp(arg, "--submodule"))
3907 DIFF_OPT_SET(options, SUBMODULE_LOG);
3908 else if (skip_prefix(arg, "--submodule=", &arg))
3909 return parse_submodule_opt(options, arg);
3910 else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
3911 return parse_ws_error_highlight(options, arg);
3912
3913 /* misc options */
3914 else if (!strcmp(arg, "-z"))
3915 options->line_termination = 0;
3916 else if ((argcount = short_opt('l', av, &optarg))) {
3917 options->rename_limit = strtoul(optarg, NULL, 10);
3918 return argcount;
3919 }
3920 else if ((argcount = short_opt('S', av, &optarg))) {
3921 options->pickaxe = optarg;
3922 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3923 return argcount;
3924 } else if ((argcount = short_opt('G', av, &optarg))) {
3925 options->pickaxe = optarg;
3926 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3927 return argcount;
3928 }
3929 else if (!strcmp(arg, "--pickaxe-all"))
3930 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3931 else if (!strcmp(arg, "--pickaxe-regex"))
3932 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3933 else if ((argcount = short_opt('O', av, &optarg))) {
3934 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3935 options->orderfile = xstrdup(path);
3936 return argcount;
3937 }
3938 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3939 int offending = parse_diff_filter_opt(optarg, options);
3940 if (offending)
3941 die("unknown change class '%c' in --diff-filter=%s",
3942 offending, optarg);
3943 return argcount;
3944 }
3945 else if (!strcmp(arg, "--abbrev"))
3946 options->abbrev = DEFAULT_ABBREV;
3947 else if (skip_prefix(arg, "--abbrev=", &arg)) {
3948 options->abbrev = strtoul(arg, NULL, 10);
3949 if (options->abbrev < MINIMUM_ABBREV)
3950 options->abbrev = MINIMUM_ABBREV;
3951 else if (40 < options->abbrev)
3952 options->abbrev = 40;
3953 }
3954 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3955 options->a_prefix = optarg;
3956 return argcount;
3957 }
3958 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3959 options->b_prefix = optarg;
3960 return argcount;
3961 }
3962 else if (!strcmp(arg, "--no-prefix"))
3963 options->a_prefix = options->b_prefix = "";
3964 else if (opt_arg(arg, '\0', "inter-hunk-context",
3965 &options->interhunkcontext))
3966 ;
3967 else if (!strcmp(arg, "-W"))
3968 DIFF_OPT_SET(options, FUNCCONTEXT);
3969 else if (!strcmp(arg, "--function-context"))
3970 DIFF_OPT_SET(options, FUNCCONTEXT);
3971 else if (!strcmp(arg, "--no-function-context"))
3972 DIFF_OPT_CLR(options, FUNCCONTEXT);
3973 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3974 const char *path = prefix_filename(prefix, strlen(prefix), optarg);
3975 options->file = fopen(path, "w");
3976 if (!options->file)
3977 die_errno("Could not open '%s'", path);
3978 options->close_file = 1;
3979 if (options->use_color != GIT_COLOR_ALWAYS)
3980 options->use_color = GIT_COLOR_NEVER;
3981 return argcount;
3982 } else
3983 return 0;
3984 return 1;
3985 }
3986
3987 int parse_rename_score(const char **cp_p)
3988 {
3989 unsigned long num, scale;
3990 int ch, dot;
3991 const char *cp = *cp_p;
3992
3993 num = 0;
3994 scale = 1;
3995 dot = 0;
3996 for (;;) {
3997 ch = *cp;
3998 if ( !dot && ch == '.' ) {
3999 scale = 1;
4000 dot = 1;
4001 } else if ( ch == '%' ) {
4002 scale = dot ? scale*100 : 100;
4003 cp++; /* % is always at the end */
4004 break;
4005 } else if ( ch >= '0' && ch <= '9' ) {
4006 if ( scale < 100000 ) {
4007 scale *= 10;
4008 num = (num*10) + (ch-'0');
4009 }
4010 } else {
4011 break;
4012 }
4013 cp++;
4014 }
4015 *cp_p = cp;
4016
4017 /* user says num divided by scale and we say internally that
4018 * is MAX_SCORE * num / scale.
4019 */
4020 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
4021 }
4022
4023 static int diff_scoreopt_parse(const char *opt)
4024 {
4025 int opt1, opt2, cmd;
4026
4027 if (*opt++ != '-')
4028 return -1;
4029 cmd = *opt++;
4030 if (cmd == '-') {
4031 /* convert the long-form arguments into short-form versions */
4032 if (skip_prefix(opt, "break-rewrites", &opt)) {
4033 if (*opt == 0 || *opt++ == '=')
4034 cmd = 'B';
4035 } else if (skip_prefix(opt, "find-copies", &opt)) {
4036 if (*opt == 0 || *opt++ == '=')
4037 cmd = 'C';
4038 } else if (skip_prefix(opt, "find-renames", &opt)) {
4039 if (*opt == 0 || *opt++ == '=')
4040 cmd = 'M';
4041 }
4042 }
4043 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
4044 return -1; /* that is not a -M, -C, or -B option */
4045
4046 opt1 = parse_rename_score(&opt);
4047 if (cmd != 'B')
4048 opt2 = 0;
4049 else {
4050 if (*opt == 0)
4051 opt2 = 0;
4052 else if (*opt != '/')
4053 return -1; /* we expect -B80/99 or -B80 */
4054 else {
4055 opt++;
4056 opt2 = parse_rename_score(&opt);
4057 }
4058 }
4059 if (*opt != 0)
4060 return -1;
4061 return opt1 | (opt2 << 16);
4062 }
4063
4064 struct diff_queue_struct diff_queued_diff;
4065
4066 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
4067 {
4068 ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
4069 queue->queue[queue->nr++] = dp;
4070 }
4071
4072 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
4073 struct diff_filespec *one,
4074 struct diff_filespec *two)
4075 {
4076 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
4077 dp->one = one;
4078 dp->two = two;
4079 if (queue)
4080 diff_q(queue, dp);
4081 return dp;
4082 }
4083
4084 void diff_free_filepair(struct diff_filepair *p)
4085 {
4086 free_filespec(p->one);
4087 free_filespec(p->two);
4088 free(p);
4089 }
4090
4091 /* This is different from find_unique_abbrev() in that
4092 * it stuffs the result with dots for alignment.
4093 */
4094 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
4095 {
4096 int abblen;
4097 const char *abbrev;
4098 if (len == 40)
4099 return sha1_to_hex(sha1);
4100
4101 abbrev = find_unique_abbrev(sha1, len);
4102 abblen = strlen(abbrev);
4103 if (abblen < 37) {
4104 static char hex[41];
4105 if (len < abblen && abblen <= len + 2)
4106 xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
4107 else
4108 xsnprintf(hex, sizeof(hex), "%s...", abbrev);
4109 return hex;
4110 }
4111 return sha1_to_hex(sha1);
4112 }
4113
4114 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
4115 {
4116 int line_termination = opt->line_termination;
4117 int inter_name_termination = line_termination ? '\t' : '\0';
4118
4119 fprintf(opt->file, "%s", diff_line_prefix(opt));
4120 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
4121 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
4122 diff_unique_abbrev(p->one->oid.hash, opt->abbrev));
4123 fprintf(opt->file, "%s ",
4124 diff_unique_abbrev(p->two->oid.hash, opt->abbrev));
4125 }
4126 if (p->score) {
4127 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
4128 inter_name_termination);
4129 } else {
4130 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
4131 }
4132
4133 if (p->status == DIFF_STATUS_COPIED ||
4134 p->status == DIFF_STATUS_RENAMED) {
4135 const char *name_a, *name_b;
4136 name_a = p->one->path;
4137 name_b = p->two->path;
4138 strip_prefix(opt->prefix_length, &name_a, &name_b);
4139 write_name_quoted(name_a, opt->file, inter_name_termination);
4140 write_name_quoted(name_b, opt->file, line_termination);
4141 } else {
4142 const char *name_a, *name_b;
4143 name_a = p->one->mode ? p->one->path : p->two->path;
4144 name_b = NULL;
4145 strip_prefix(opt->prefix_length, &name_a, &name_b);
4146 write_name_quoted(name_a, opt->file, line_termination);
4147 }
4148 }
4149
4150 int diff_unmodified_pair(struct diff_filepair *p)
4151 {
4152 /* This function is written stricter than necessary to support
4153 * the currently implemented transformers, but the idea is to
4154 * let transformers to produce diff_filepairs any way they want,
4155 * and filter and clean them up here before producing the output.
4156 */
4157 struct diff_filespec *one = p->one, *two = p->two;
4158
4159 if (DIFF_PAIR_UNMERGED(p))
4160 return 0; /* unmerged is interesting */
4161
4162 /* deletion, addition, mode or type change
4163 * and rename are all interesting.
4164 */
4165 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
4166 DIFF_PAIR_MODE_CHANGED(p) ||
4167 strcmp(one->path, two->path))
4168 return 0;
4169
4170 /* both are valid and point at the same path. that is, we are
4171 * dealing with a change.
4172 */
4173 if (one->oid_valid && two->oid_valid &&
4174 !oidcmp(&one->oid, &two->oid) &&
4175 !one->dirty_submodule && !two->dirty_submodule)
4176 return 1; /* no change */
4177 if (!one->oid_valid && !two->oid_valid)
4178 return 1; /* both look at the same file on the filesystem. */
4179 return 0;
4180 }
4181
4182 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
4183 {
4184 if (diff_unmodified_pair(p))
4185 return;
4186
4187 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4188 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4189 return; /* no tree diffs in patch format */
4190
4191 run_diff(p, o);
4192 }
4193
4194 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
4195 struct diffstat_t *diffstat)
4196 {
4197 if (diff_unmodified_pair(p))
4198 return;
4199
4200 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4201 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4202 return; /* no useful stat for tree diffs */
4203
4204 run_diffstat(p, o, diffstat);
4205 }
4206
4207 static void diff_flush_checkdiff(struct diff_filepair *p,
4208 struct diff_options *o)
4209 {
4210 if (diff_unmodified_pair(p))
4211 return;
4212
4213 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4214 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4215 return; /* nothing to check in tree diffs */
4216
4217 run_checkdiff(p, o);
4218 }
4219
4220 int diff_queue_is_empty(void)
4221 {
4222 struct diff_queue_struct *q = &diff_queued_diff;
4223 int i;
4224 for (i = 0; i < q->nr; i++)
4225 if (!diff_unmodified_pair(q->queue[i]))
4226 return 0;
4227 return 1;
4228 }
4229
4230 #if DIFF_DEBUG
4231 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
4232 {
4233 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
4234 x, one ? one : "",
4235 s->path,
4236 DIFF_FILE_VALID(s) ? "valid" : "invalid",
4237 s->mode,
4238 s->oid_valid ? oid_to_hex(&s->oid) : "");
4239 fprintf(stderr, "queue[%d] %s size %lu\n",
4240 x, one ? one : "",
4241 s->size);
4242 }
4243
4244 void diff_debug_filepair(const struct diff_filepair *p, int i)
4245 {
4246 diff_debug_filespec(p->one, i, "one");
4247 diff_debug_filespec(p->two, i, "two");
4248 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
4249 p->score, p->status ? p->status : '?',
4250 p->one->rename_used, p->broken_pair);
4251 }
4252
4253 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
4254 {
4255 int i;
4256 if (msg)
4257 fprintf(stderr, "%s\n", msg);
4258 fprintf(stderr, "q->nr = %d\n", q->nr);
4259 for (i = 0; i < q->nr; i++) {
4260 struct diff_filepair *p = q->queue[i];
4261 diff_debug_filepair(p, i);
4262 }
4263 }
4264 #endif
4265
4266 static void diff_resolve_rename_copy(void)
4267 {
4268 int i;
4269 struct diff_filepair *p;
4270 struct diff_queue_struct *q = &diff_queued_diff;
4271
4272 diff_debug_queue("resolve-rename-copy", q);
4273
4274 for (i = 0; i < q->nr; i++) {
4275 p = q->queue[i];
4276 p->status = 0; /* undecided */
4277 if (DIFF_PAIR_UNMERGED(p))
4278 p->status = DIFF_STATUS_UNMERGED;
4279 else if (!DIFF_FILE_VALID(p->one))
4280 p->status = DIFF_STATUS_ADDED;
4281 else if (!DIFF_FILE_VALID(p->two))
4282 p->status = DIFF_STATUS_DELETED;
4283 else if (DIFF_PAIR_TYPE_CHANGED(p))
4284 p->status = DIFF_STATUS_TYPE_CHANGED;
4285
4286 /* from this point on, we are dealing with a pair
4287 * whose both sides are valid and of the same type, i.e.
4288 * either in-place edit or rename/copy edit.
4289 */
4290 else if (DIFF_PAIR_RENAME(p)) {
4291 /*
4292 * A rename might have re-connected a broken
4293 * pair up, causing the pathnames to be the
4294 * same again. If so, that's not a rename at
4295 * all, just a modification..
4296 *
4297 * Otherwise, see if this source was used for
4298 * multiple renames, in which case we decrement
4299 * the count, and call it a copy.
4300 */
4301 if (!strcmp(p->one->path, p->two->path))
4302 p->status = DIFF_STATUS_MODIFIED;
4303 else if (--p->one->rename_used > 0)
4304 p->status = DIFF_STATUS_COPIED;
4305 else
4306 p->status = DIFF_STATUS_RENAMED;
4307 }
4308 else if (oidcmp(&p->one->oid, &p->two->oid) ||
4309 p->one->mode != p->two->mode ||
4310 p->one->dirty_submodule ||
4311 p->two->dirty_submodule ||
4312 is_null_oid(&p->one->oid))
4313 p->status = DIFF_STATUS_MODIFIED;
4314 else {
4315 /* This is a "no-change" entry and should not
4316 * happen anymore, but prepare for broken callers.
4317 */
4318 error("feeding unmodified %s to diffcore",
4319 p->one->path);
4320 p->status = DIFF_STATUS_UNKNOWN;
4321 }
4322 }
4323 diff_debug_queue("resolve-rename-copy done", q);
4324 }
4325
4326 static int check_pair_status(struct diff_filepair *p)
4327 {
4328 switch (p->status) {
4329 case DIFF_STATUS_UNKNOWN:
4330 return 0;
4331 case 0:
4332 die("internal error in diff-resolve-rename-copy");
4333 default:
4334 return 1;
4335 }
4336 }
4337
4338 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
4339 {
4340 int fmt = opt->output_format;
4341
4342 if (fmt & DIFF_FORMAT_CHECKDIFF)
4343 diff_flush_checkdiff(p, opt);
4344 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4345 diff_flush_raw(p, opt);
4346 else if (fmt & DIFF_FORMAT_NAME) {
4347 const char *name_a, *name_b;
4348 name_a = p->two->path;
4349 name_b = NULL;
4350 strip_prefix(opt->prefix_length, &name_a, &name_b);
4351 write_name_quoted(name_a, opt->file, opt->line_termination);
4352 }
4353 }
4354
4355 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4356 {
4357 if (fs->mode)
4358 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4359 else
4360 fprintf(file, " %s ", newdelete);
4361 write_name_quoted(fs->path, file, '\n');
4362 }
4363
4364
4365 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4366 const char *line_prefix)
4367 {
4368 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4369 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4370 p->two->mode, show_name ? ' ' : '\n');
4371 if (show_name) {
4372 write_name_quoted(p->two->path, file, '\n');
4373 }
4374 }
4375 }
4376
4377 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4378 const char *line_prefix)
4379 {
4380 char *names = pprint_rename(p->one->path, p->two->path);
4381
4382 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4383 free(names);
4384 show_mode_change(file, p, 0, line_prefix);
4385 }
4386
4387 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4388 {
4389 FILE *file = opt->file;
4390 const char *line_prefix = diff_line_prefix(opt);
4391
4392 switch(p->status) {
4393 case DIFF_STATUS_DELETED:
4394 fputs(line_prefix, file);
4395 show_file_mode_name(file, "delete", p->one);
4396 break;
4397 case DIFF_STATUS_ADDED:
4398 fputs(line_prefix, file);
4399 show_file_mode_name(file, "create", p->two);
4400 break;
4401 case DIFF_STATUS_COPIED:
4402 fputs(line_prefix, file);
4403 show_rename_copy(file, "copy", p, line_prefix);
4404 break;
4405 case DIFF_STATUS_RENAMED:
4406 fputs(line_prefix, file);
4407 show_rename_copy(file, "rename", p, line_prefix);
4408 break;
4409 default:
4410 if (p->score) {
4411 fprintf(file, "%s rewrite ", line_prefix);
4412 write_name_quoted(p->two->path, file, ' ');
4413 fprintf(file, "(%d%%)\n", similarity_index(p));
4414 }
4415 show_mode_change(file, p, !p->score, line_prefix);
4416 break;
4417 }
4418 }
4419
4420 struct patch_id_t {
4421 git_SHA_CTX *ctx;
4422 int patchlen;
4423 };
4424
4425 static int remove_space(char *line, int len)
4426 {
4427 int i;
4428 char *dst = line;
4429 unsigned char c;
4430
4431 for (i = 0; i < len; i++)
4432 if (!isspace((c = line[i])))
4433 *dst++ = c;
4434
4435 return dst - line;
4436 }
4437
4438 static void patch_id_consume(void *priv, char *line, unsigned long len)
4439 {
4440 struct patch_id_t *data = priv;
4441 int new_len;
4442
4443 /* Ignore line numbers when computing the SHA1 of the patch */
4444 if (starts_with(line, "@@ -"))
4445 return;
4446
4447 new_len = remove_space(line, len);
4448
4449 git_SHA1_Update(data->ctx, line, new_len);
4450 data->patchlen += new_len;
4451 }
4452
4453 /* returns 0 upon success, and writes result into sha1 */
4454 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4455 {
4456 struct diff_queue_struct *q = &diff_queued_diff;
4457 int i;
4458 git_SHA_CTX ctx;
4459 struct patch_id_t data;
4460 char buffer[PATH_MAX * 4 + 20];
4461
4462 git_SHA1_Init(&ctx);
4463 memset(&data, 0, sizeof(struct patch_id_t));
4464 data.ctx = &ctx;
4465
4466 for (i = 0; i < q->nr; i++) {
4467 xpparam_t xpp;
4468 xdemitconf_t xecfg;
4469 mmfile_t mf1, mf2;
4470 struct diff_filepair *p = q->queue[i];
4471 int len1, len2;
4472
4473 memset(&xpp, 0, sizeof(xpp));
4474 memset(&xecfg, 0, sizeof(xecfg));
4475 if (p->status == 0)
4476 return error("internal diff status error");
4477 if (p->status == DIFF_STATUS_UNKNOWN)
4478 continue;
4479 if (diff_unmodified_pair(p))
4480 continue;
4481 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4482 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4483 continue;
4484 if (DIFF_PAIR_UNMERGED(p))
4485 continue;
4486
4487 diff_fill_sha1_info(p->one);
4488 diff_fill_sha1_info(p->two);
4489
4490 len1 = remove_space(p->one->path, strlen(p->one->path));
4491 len2 = remove_space(p->two->path, strlen(p->two->path));
4492 if (p->one->mode == 0)
4493 len1 = snprintf(buffer, sizeof(buffer),
4494 "diff--gita/%.*sb/%.*s"
4495 "newfilemode%06o"
4496 "---/dev/null"
4497 "+++b/%.*s",
4498 len1, p->one->path,
4499 len2, p->two->path,
4500 p->two->mode,
4501 len2, p->two->path);
4502 else if (p->two->mode == 0)
4503 len1 = snprintf(buffer, sizeof(buffer),
4504 "diff--gita/%.*sb/%.*s"
4505 "deletedfilemode%06o"
4506 "---a/%.*s"
4507 "+++/dev/null",
4508 len1, p->one->path,
4509 len2, p->two->path,
4510 p->one->mode,
4511 len1, p->one->path);
4512 else
4513 len1 = snprintf(buffer, sizeof(buffer),
4514 "diff--gita/%.*sb/%.*s"
4515 "---a/%.*s"
4516 "+++b/%.*s",
4517 len1, p->one->path,
4518 len2, p->two->path,
4519 len1, p->one->path,
4520 len2, p->two->path);
4521 git_SHA1_Update(&ctx, buffer, len1);
4522
4523 if (diff_header_only)
4524 continue;
4525
4526 if (fill_mmfile(&mf1, p->one) < 0 ||
4527 fill_mmfile(&mf2, p->two) < 0)
4528 return error("unable to read files to diff");
4529
4530 if (diff_filespec_is_binary(p->one) ||
4531 diff_filespec_is_binary(p->two)) {
4532 git_SHA1_Update(&ctx, oid_to_hex(&p->one->oid),
4533 40);
4534 git_SHA1_Update(&ctx, oid_to_hex(&p->two->oid),
4535 40);
4536 continue;
4537 }
4538
4539 xpp.flags = 0;
4540 xecfg.ctxlen = 3;
4541 xecfg.flags = 0;
4542 if (xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4543 &xpp, &xecfg))
4544 return error("unable to generate patch-id diff for %s",
4545 p->one->path);
4546 }
4547
4548 git_SHA1_Final(sha1, &ctx);
4549 return 0;
4550 }
4551
4552 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1, int diff_header_only)
4553 {
4554 struct diff_queue_struct *q = &diff_queued_diff;
4555 int i;
4556 int result = diff_get_patch_id(options, sha1, diff_header_only);
4557
4558 for (i = 0; i < q->nr; i++)
4559 diff_free_filepair(q->queue[i]);
4560
4561 free(q->queue);
4562 DIFF_QUEUE_CLEAR(q);
4563
4564 return result;
4565 }
4566
4567 static int is_summary_empty(const struct diff_queue_struct *q)
4568 {
4569 int i;
4570
4571 for (i = 0; i < q->nr; i++) {
4572 const struct diff_filepair *p = q->queue[i];
4573
4574 switch (p->status) {
4575 case DIFF_STATUS_DELETED:
4576 case DIFF_STATUS_ADDED:
4577 case DIFF_STATUS_COPIED:
4578 case DIFF_STATUS_RENAMED:
4579 return 0;
4580 default:
4581 if (p->score)
4582 return 0;
4583 if (p->one->mode && p->two->mode &&
4584 p->one->mode != p->two->mode)
4585 return 0;
4586 break;
4587 }
4588 }
4589 return 1;
4590 }
4591
4592 static const char rename_limit_warning[] =
4593 "inexact rename detection was skipped due to too many files.";
4594
4595 static const char degrade_cc_to_c_warning[] =
4596 "only found copies from modified paths due to too many files.";
4597
4598 static const char rename_limit_advice[] =
4599 "you may want to set your %s variable to at least "
4600 "%d and retry the command.";
4601
4602 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4603 {
4604 if (degraded_cc)
4605 warning(degrade_cc_to_c_warning);
4606 else if (needed)
4607 warning(rename_limit_warning);
4608 else
4609 return;
4610 if (0 < needed && needed < 32767)
4611 warning(rename_limit_advice, varname, needed);
4612 }
4613
4614 void diff_flush(struct diff_options *options)
4615 {
4616 struct diff_queue_struct *q = &diff_queued_diff;
4617 int i, output_format = options->output_format;
4618 int separator = 0;
4619 int dirstat_by_line = 0;
4620
4621 /*
4622 * Order: raw, stat, summary, patch
4623 * or: name/name-status/checkdiff (other bits clear)
4624 */
4625 if (!q->nr)
4626 goto free_queue;
4627
4628 if (output_format & (DIFF_FORMAT_RAW |
4629 DIFF_FORMAT_NAME |
4630 DIFF_FORMAT_NAME_STATUS |
4631 DIFF_FORMAT_CHECKDIFF)) {
4632 for (i = 0; i < q->nr; i++) {
4633 struct diff_filepair *p = q->queue[i];
4634 if (check_pair_status(p))
4635 flush_one_pair(p, options);
4636 }
4637 separator++;
4638 }
4639
4640 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4641 dirstat_by_line = 1;
4642
4643 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4644 dirstat_by_line) {
4645 struct diffstat_t diffstat;
4646
4647 memset(&diffstat, 0, sizeof(struct diffstat_t));
4648 for (i = 0; i < q->nr; i++) {
4649 struct diff_filepair *p = q->queue[i];
4650 if (check_pair_status(p))
4651 diff_flush_stat(p, options, &diffstat);
4652 }
4653 if (output_format & DIFF_FORMAT_NUMSTAT)
4654 show_numstat(&diffstat, options);
4655 if (output_format & DIFF_FORMAT_DIFFSTAT)
4656 show_stats(&diffstat, options);
4657 if (output_format & DIFF_FORMAT_SHORTSTAT)
4658 show_shortstats(&diffstat, options);
4659 if (output_format & DIFF_FORMAT_DIRSTAT && dirstat_by_line)
4660 show_dirstat_by_line(&diffstat, options);
4661 free_diffstat_info(&diffstat);
4662 separator++;
4663 }
4664 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4665 show_dirstat(options);
4666
4667 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4668 for (i = 0; i < q->nr; i++) {
4669 diff_summary(options, q->queue[i]);
4670 }
4671 separator++;
4672 }
4673
4674 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4675 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4676 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4677 /*
4678 * run diff_flush_patch for the exit status. setting
4679 * options->file to /dev/null should be safe, because we
4680 * aren't supposed to produce any output anyway.
4681 */
4682 if (options->close_file)
4683 fclose(options->file);
4684 options->file = fopen("/dev/null", "w");
4685 if (!options->file)
4686 die_errno("Could not open /dev/null");
4687 options->close_file = 1;
4688 for (i = 0; i < q->nr; i++) {
4689 struct diff_filepair *p = q->queue[i];
4690 if (check_pair_status(p))
4691 diff_flush_patch(p, options);
4692 if (options->found_changes)
4693 break;
4694 }
4695 }
4696
4697 if (output_format & DIFF_FORMAT_PATCH) {
4698 if (separator) {
4699 fprintf(options->file, "%s%c",
4700 diff_line_prefix(options),
4701 options->line_termination);
4702 if (options->stat_sep) {
4703 /* attach patch instead of inline */
4704 fputs(options->stat_sep, options->file);
4705 }
4706 }
4707
4708 for (i = 0; i < q->nr; i++) {
4709 struct diff_filepair *p = q->queue[i];
4710 if (check_pair_status(p))
4711 diff_flush_patch(p, options);
4712 }
4713 }
4714
4715 if (output_format & DIFF_FORMAT_CALLBACK)
4716 options->format_callback(q, options, options->format_callback_data);
4717
4718 for (i = 0; i < q->nr; i++)
4719 diff_free_filepair(q->queue[i]);
4720 free_queue:
4721 free(q->queue);
4722 DIFF_QUEUE_CLEAR(q);
4723 if (options->close_file)
4724 fclose(options->file);
4725
4726 /*
4727 * Report the content-level differences with HAS_CHANGES;
4728 * diff_addremove/diff_change does not set the bit when
4729 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4730 */
4731 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4732 if (options->found_changes)
4733 DIFF_OPT_SET(options, HAS_CHANGES);
4734 else
4735 DIFF_OPT_CLR(options, HAS_CHANGES);
4736 }
4737 }
4738
4739 static int match_filter(const struct diff_options *options, const struct diff_filepair *p)
4740 {
4741 return (((p->status == DIFF_STATUS_MODIFIED) &&
4742 ((p->score &&
4743 filter_bit_tst(DIFF_STATUS_FILTER_BROKEN, options)) ||
4744 (!p->score &&
4745 filter_bit_tst(DIFF_STATUS_MODIFIED, options)))) ||
4746 ((p->status != DIFF_STATUS_MODIFIED) &&
4747 filter_bit_tst(p->status, options)));
4748 }
4749
4750 static void diffcore_apply_filter(struct diff_options *options)
4751 {
4752 int i;
4753 struct diff_queue_struct *q = &diff_queued_diff;
4754 struct diff_queue_struct outq;
4755
4756 DIFF_QUEUE_CLEAR(&outq);
4757
4758 if (!options->filter)
4759 return;
4760
4761 if (filter_bit_tst(DIFF_STATUS_FILTER_AON, options)) {
4762 int found;
4763 for (i = found = 0; !found && i < q->nr; i++) {
4764 if (match_filter(options, q->queue[i]))
4765 found++;
4766 }
4767 if (found)
4768 return;
4769
4770 /* otherwise we will clear the whole queue
4771 * by copying the empty outq at the end of this
4772 * function, but first clear the current entries
4773 * in the queue.
4774 */
4775 for (i = 0; i < q->nr; i++)
4776 diff_free_filepair(q->queue[i]);
4777 }
4778 else {
4779 /* Only the matching ones */
4780 for (i = 0; i < q->nr; i++) {
4781 struct diff_filepair *p = q->queue[i];
4782 if (match_filter(options, p))
4783 diff_q(&outq, p);
4784 else
4785 diff_free_filepair(p);
4786 }
4787 }
4788 free(q->queue);
4789 *q = outq;
4790 }
4791
4792 /* Check whether two filespecs with the same mode and size are identical */
4793 static int diff_filespec_is_identical(struct diff_filespec *one,
4794 struct diff_filespec *two)
4795 {
4796 if (S_ISGITLINK(one->mode))
4797 return 0;
4798 if (diff_populate_filespec(one, 0))
4799 return 0;
4800 if (diff_populate_filespec(two, 0))
4801 return 0;
4802 return !memcmp(one->data, two->data, one->size);
4803 }
4804
4805 static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
4806 {
4807 if (p->done_skip_stat_unmatch)
4808 return p->skip_stat_unmatch_result;
4809
4810 p->done_skip_stat_unmatch = 1;
4811 p->skip_stat_unmatch_result = 0;
4812 /*
4813 * 1. Entries that come from stat info dirtiness
4814 * always have both sides (iow, not create/delete),
4815 * one side of the object name is unknown, with
4816 * the same mode and size. Keep the ones that
4817 * do not match these criteria. They have real
4818 * differences.
4819 *
4820 * 2. At this point, the file is known to be modified,
4821 * with the same mode and size, and the object
4822 * name of one side is unknown. Need to inspect
4823 * the identical contents.
4824 */
4825 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4826 !DIFF_FILE_VALID(p->two) ||
4827 (p->one->oid_valid && p->two->oid_valid) ||
4828 (p->one->mode != p->two->mode) ||
4829 diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
4830 diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
4831 (p->one->size != p->two->size) ||
4832 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4833 p->skip_stat_unmatch_result = 1;
4834 return p->skip_stat_unmatch_result;
4835 }
4836
4837 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4838 {
4839 int i;
4840 struct diff_queue_struct *q = &diff_queued_diff;
4841 struct diff_queue_struct outq;
4842 DIFF_QUEUE_CLEAR(&outq);
4843
4844 for (i = 0; i < q->nr; i++) {
4845 struct diff_filepair *p = q->queue[i];
4846
4847 if (diff_filespec_check_stat_unmatch(p))
4848 diff_q(&outq, p);
4849 else {
4850 /*
4851 * The caller can subtract 1 from skip_stat_unmatch
4852 * to determine how many paths were dirty only
4853 * due to stat info mismatch.
4854 */
4855 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4856 diffopt->skip_stat_unmatch++;
4857 diff_free_filepair(p);
4858 }
4859 }
4860 free(q->queue);
4861 *q = outq;
4862 }
4863
4864 static int diffnamecmp(const void *a_, const void *b_)
4865 {
4866 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4867 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4868 const char *name_a, *name_b;
4869
4870 name_a = a->one ? a->one->path : a->two->path;
4871 name_b = b->one ? b->one->path : b->two->path;
4872 return strcmp(name_a, name_b);
4873 }
4874
4875 void diffcore_fix_diff_index(struct diff_options *options)
4876 {
4877 struct diff_queue_struct *q = &diff_queued_diff;
4878 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4879 }
4880
4881 void diffcore_std(struct diff_options *options)
4882 {
4883 /* NOTE please keep the following in sync with diff_tree_combined() */
4884 if (options->skip_stat_unmatch)
4885 diffcore_skip_stat_unmatch(options);
4886 if (!options->found_follow) {
4887 /* See try_to_follow_renames() in tree-diff.c */
4888 if (options->break_opt != -1)
4889 diffcore_break(options->break_opt);
4890 if (options->detect_rename)
4891 diffcore_rename(options);
4892 if (options->break_opt != -1)
4893 diffcore_merge_broken();
4894 }
4895 if (options->pickaxe)
4896 diffcore_pickaxe(options);
4897 if (options->orderfile)
4898 diffcore_order(options->orderfile);
4899 if (!options->found_follow)
4900 /* See try_to_follow_renames() in tree-diff.c */
4901 diff_resolve_rename_copy();
4902 diffcore_apply_filter(options);
4903
4904 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4905 DIFF_OPT_SET(options, HAS_CHANGES);
4906 else
4907 DIFF_OPT_CLR(options, HAS_CHANGES);
4908
4909 options->found_follow = 0;
4910 }
4911
4912 int diff_result_code(struct diff_options *opt, int status)
4913 {
4914 int result = 0;
4915
4916 diff_warn_rename_limit("diff.renameLimit",
4917 opt->needed_rename_limit,
4918 opt->degraded_cc_to_c);
4919 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4920 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4921 return status;
4922 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4923 DIFF_OPT_TST(opt, HAS_CHANGES))
4924 result |= 01;
4925 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4926 DIFF_OPT_TST(opt, CHECK_FAILED))
4927 result |= 02;
4928 return result;
4929 }
4930
4931 int diff_can_quit_early(struct diff_options *opt)
4932 {
4933 return (DIFF_OPT_TST(opt, QUICK) &&
4934 !opt->filter &&
4935 DIFF_OPT_TST(opt, HAS_CHANGES));
4936 }
4937
4938 /*
4939 * Shall changes to this submodule be ignored?
4940 *
4941 * Submodule changes can be configured to be ignored separately for each path,
4942 * but that configuration can be overridden from the command line.
4943 */
4944 static int is_submodule_ignored(const char *path, struct diff_options *options)
4945 {
4946 int ignored = 0;
4947 unsigned orig_flags = options->flags;
4948 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4949 set_diffopt_flags_from_submodule_config(options, path);
4950 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4951 ignored = 1;
4952 options->flags = orig_flags;
4953 return ignored;
4954 }
4955
4956 void diff_addremove(struct diff_options *options,
4957 int addremove, unsigned mode,
4958 const unsigned char *sha1,
4959 int sha1_valid,
4960 const char *concatpath, unsigned dirty_submodule)
4961 {
4962 struct diff_filespec *one, *two;
4963
4964 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4965 return;
4966
4967 /* This may look odd, but it is a preparation for
4968 * feeding "there are unchanged files which should
4969 * not produce diffs, but when you are doing copy
4970 * detection you would need them, so here they are"
4971 * entries to the diff-core. They will be prefixed
4972 * with something like '=' or '*' (I haven't decided
4973 * which but should not make any difference).
4974 * Feeding the same new and old to diff_change()
4975 * also has the same effect.
4976 * Before the final output happens, they are pruned after
4977 * merged into rename/copy pairs as appropriate.
4978 */
4979 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4980 addremove = (addremove == '+' ? '-' :
4981 addremove == '-' ? '+' : addremove);
4982
4983 if (options->prefix &&
4984 strncmp(concatpath, options->prefix, options->prefix_length))
4985 return;
4986
4987 one = alloc_filespec(concatpath);
4988 two = alloc_filespec(concatpath);
4989
4990 if (addremove != '+')
4991 fill_filespec(one, sha1, sha1_valid, mode);
4992 if (addremove != '-') {
4993 fill_filespec(two, sha1, sha1_valid, mode);
4994 two->dirty_submodule = dirty_submodule;
4995 }
4996
4997 diff_queue(&diff_queued_diff, one, two);
4998 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4999 DIFF_OPT_SET(options, HAS_CHANGES);
5000 }
5001
5002 void diff_change(struct diff_options *options,
5003 unsigned old_mode, unsigned new_mode,
5004 const unsigned char *old_sha1,
5005 const unsigned char *new_sha1,
5006 int old_sha1_valid, int new_sha1_valid,
5007 const char *concatpath,
5008 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
5009 {
5010 struct diff_filespec *one, *two;
5011 struct diff_filepair *p;
5012
5013 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
5014 is_submodule_ignored(concatpath, options))
5015 return;
5016
5017 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
5018 unsigned tmp;
5019 const unsigned char *tmp_c;
5020 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
5021 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
5022 tmp = old_sha1_valid; old_sha1_valid = new_sha1_valid;
5023 new_sha1_valid = tmp;
5024 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
5025 new_dirty_submodule = tmp;
5026 }
5027
5028 if (options->prefix &&
5029 strncmp(concatpath, options->prefix, options->prefix_length))
5030 return;
5031
5032 one = alloc_filespec(concatpath);
5033 two = alloc_filespec(concatpath);
5034 fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
5035 fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
5036 one->dirty_submodule = old_dirty_submodule;
5037 two->dirty_submodule = new_dirty_submodule;
5038 p = diff_queue(&diff_queued_diff, one, two);
5039
5040 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
5041 return;
5042
5043 if (DIFF_OPT_TST(options, QUICK) && options->skip_stat_unmatch &&
5044 !diff_filespec_check_stat_unmatch(p))
5045 return;
5046
5047 DIFF_OPT_SET(options, HAS_CHANGES);
5048 }
5049
5050 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
5051 {
5052 struct diff_filepair *pair;
5053 struct diff_filespec *one, *two;
5054
5055 if (options->prefix &&
5056 strncmp(path, options->prefix, options->prefix_length))
5057 return NULL;
5058
5059 one = alloc_filespec(path);
5060 two = alloc_filespec(path);
5061 pair = diff_queue(&diff_queued_diff, one, two);
5062 pair->is_unmerged = 1;
5063 return pair;
5064 }
5065
5066 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
5067 size_t *outsize)
5068 {
5069 struct diff_tempfile *temp;
5070 const char *argv[3];
5071 const char **arg = argv;
5072 struct child_process child = CHILD_PROCESS_INIT;
5073 struct strbuf buf = STRBUF_INIT;
5074 int err = 0;
5075
5076 temp = prepare_temp_file(spec->path, spec);
5077 *arg++ = pgm;
5078 *arg++ = temp->name;
5079 *arg = NULL;
5080
5081 child.use_shell = 1;
5082 child.argv = argv;
5083 child.out = -1;
5084 if (start_command(&child)) {
5085 remove_tempfile();
5086 return NULL;
5087 }
5088
5089 if (strbuf_read(&buf, child.out, 0) < 0)
5090 err = error("error reading from textconv command '%s'", pgm);
5091 close(child.out);
5092
5093 if (finish_command(&child) || err) {
5094 strbuf_release(&buf);
5095 remove_tempfile();
5096 return NULL;
5097 }
5098 remove_tempfile();
5099
5100 return strbuf_detach(&buf, outsize);
5101 }
5102
5103 size_t fill_textconv(struct userdiff_driver *driver,
5104 struct diff_filespec *df,
5105 char **outbuf)
5106 {
5107 size_t size;
5108
5109 if (!driver) {
5110 if (!DIFF_FILE_VALID(df)) {
5111 *outbuf = "";
5112 return 0;
5113 }
5114 if (diff_populate_filespec(df, 0))
5115 die("unable to read files to diff");
5116 *outbuf = df->data;
5117 return df->size;
5118 }
5119
5120 if (!driver->textconv)
5121 die("BUG: fill_textconv called with non-textconv driver");
5122
5123 if (driver->textconv_cache && df->oid_valid) {
5124 *outbuf = notes_cache_get(driver->textconv_cache,
5125 df->oid.hash,
5126 &size);
5127 if (*outbuf)
5128 return size;
5129 }
5130
5131 *outbuf = run_textconv(driver->textconv, df, &size);
5132 if (!*outbuf)
5133 die("unable to read files to diff");
5134
5135 if (driver->textconv_cache && df->oid_valid) {
5136 /* ignore errors, as we might be in a readonly repository */
5137 notes_cache_put(driver->textconv_cache, df->oid.hash, *outbuf,
5138 size);
5139 /*
5140 * we could save up changes and flush them all at the end,
5141 * but we would need an extra call after all diffing is done.
5142 * Since generating a cache entry is the slow path anyway,
5143 * this extra overhead probably isn't a big deal.
5144 */
5145 notes_cache_write(driver->textconv_cache);
5146 }
5147
5148 return size;
5149 }
5150
5151 void setup_diff_pager(struct diff_options *opt)
5152 {
5153 /*
5154 * If the user asked for our exit code, then either they want --quiet
5155 * or --exit-code. We should definitely not bother with a pager in the
5156 * former case, as we will generate no output. Since we still properly
5157 * report our exit code even when a pager is run, we _could_ run a
5158 * pager with --exit-code. But since we have not done so historically,
5159 * and because it is easy to find people oneline advising "git diff
5160 * --exit-code" in hooks and other scripts, we do not do so.
5161 */
5162 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
5163 check_pager_config("diff") != 0)
5164 setup_pager();
5165 }
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