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a2f4850d4fdf3758b75cc086e47e18736075c999
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
15 #ifdef NO_FAST_WORKING_DIRECTORY
16 #define FAST_WORKING_DIRECTORY 0
17 #else
18 #define FAST_WORKING_DIRECTORY 1
19 #endif
21 static int diff_detect_rename_default;
22 static int diff_rename_limit_default = 200;
23 static int diff_suppress_blank_empty;
24 int diff_use_color_default = -1;
25 static const char *external_diff_cmd_cfg;
26 int diff_auto_refresh_index = 1;
27 static int diff_mnemonic_prefix;
29 static char diff_colors[][COLOR_MAXLEN] = {
30 "\033[m", /* reset */
31 "", /* PLAIN (normal) */
32 "\033[1m", /* METAINFO (bold) */
33 "\033[36m", /* FRAGINFO (cyan) */
34 "\033[31m", /* OLD (red) */
35 "\033[32m", /* NEW (green) */
36 "\033[33m", /* COMMIT (yellow) */
37 "\033[41m", /* WHITESPACE (red background) */
38 };
40 static int parse_diff_color_slot(const char *var, int ofs)
41 {
42 if (!strcasecmp(var+ofs, "plain"))
43 return DIFF_PLAIN;
44 if (!strcasecmp(var+ofs, "meta"))
45 return DIFF_METAINFO;
46 if (!strcasecmp(var+ofs, "frag"))
47 return DIFF_FRAGINFO;
48 if (!strcasecmp(var+ofs, "old"))
49 return DIFF_FILE_OLD;
50 if (!strcasecmp(var+ofs, "new"))
51 return DIFF_FILE_NEW;
52 if (!strcasecmp(var+ofs, "commit"))
53 return DIFF_COMMIT;
54 if (!strcasecmp(var+ofs, "whitespace"))
55 return DIFF_WHITESPACE;
56 die("bad config variable '%s'", var);
57 }
59 static struct ll_diff_driver {
60 const char *name;
61 struct ll_diff_driver *next;
62 const char *cmd;
63 } *user_diff, **user_diff_tail;
65 /*
66 * Currently there is only "diff.<drivername>.command" variable;
67 * because there are "diff.color.<slot>" variables, we are parsing
68 * this in a bit convoluted way to allow low level diff driver
69 * called "color".
70 */
71 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
72 {
73 const char *name;
74 int namelen;
75 struct ll_diff_driver *drv;
77 name = var + 5;
78 namelen = ep - name;
79 for (drv = user_diff; drv; drv = drv->next)
80 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
81 break;
82 if (!drv) {
83 drv = xcalloc(1, sizeof(struct ll_diff_driver));
84 drv->name = xmemdupz(name, namelen);
85 if (!user_diff_tail)
86 user_diff_tail = &user_diff;
87 *user_diff_tail = drv;
88 user_diff_tail = &(drv->next);
89 }
91 return git_config_string(&(drv->cmd), var, value);
92 }
94 /*
95 * 'diff.<what>.funcname' attribute can be specified in the configuration
96 * to define a customized regexp to find the beginning of a function to
97 * be used for hunk header lines of "diff -p" style output.
98 */
99 static struct funcname_pattern {
100 char *name;
101 char *pattern;
102 struct funcname_pattern *next;
103 } *funcname_pattern_list;
105 static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
106 {
107 const char *name;
108 int namelen;
109 struct funcname_pattern *pp;
111 name = var + 5; /* "diff." */
112 namelen = ep - name;
114 for (pp = funcname_pattern_list; pp; pp = pp->next)
115 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
116 break;
117 if (!pp) {
118 pp = xcalloc(1, sizeof(*pp));
119 pp->name = xmemdupz(name, namelen);
120 pp->next = funcname_pattern_list;
121 funcname_pattern_list = pp;
122 }
123 free(pp->pattern);
124 pp->pattern = xstrdup(value);
125 return 0;
126 }
128 /*
129 * These are to give UI layer defaults.
130 * The core-level commands such as git-diff-files should
131 * never be affected by the setting of diff.renames
132 * the user happens to have in the configuration file.
133 */
134 int git_diff_ui_config(const char *var, const char *value, void *cb)
135 {
136 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
137 diff_use_color_default = git_config_colorbool(var, value, -1);
138 return 0;
139 }
140 if (!strcmp(var, "diff.renames")) {
141 if (!value)
142 diff_detect_rename_default = DIFF_DETECT_RENAME;
143 else if (!strcasecmp(value, "copies") ||
144 !strcasecmp(value, "copy"))
145 diff_detect_rename_default = DIFF_DETECT_COPY;
146 else if (git_config_bool(var,value))
147 diff_detect_rename_default = DIFF_DETECT_RENAME;
148 return 0;
149 }
150 if (!strcmp(var, "diff.autorefreshindex")) {
151 diff_auto_refresh_index = git_config_bool(var, value);
152 return 0;
153 }
154 if (!strcmp(var, "diff.mnemonicprefix")) {
155 diff_mnemonic_prefix = git_config_bool(var, value);
156 return 0;
157 }
158 if (!strcmp(var, "diff.external"))
159 return git_config_string(&external_diff_cmd_cfg, var, value);
160 if (!prefixcmp(var, "diff.")) {
161 const char *ep = strrchr(var, '.');
163 if (ep != var + 4 && !strcmp(ep, ".command"))
164 return parse_lldiff_command(var, ep, value);
165 }
167 return git_diff_basic_config(var, value, cb);
168 }
170 int git_diff_basic_config(const char *var, const char *value, void *cb)
171 {
172 if (!strcmp(var, "diff.renamelimit")) {
173 diff_rename_limit_default = git_config_int(var, value);
174 return 0;
175 }
177 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
178 int slot = parse_diff_color_slot(var, 11);
179 if (!value)
180 return config_error_nonbool(var);
181 color_parse(value, var, diff_colors[slot]);
182 return 0;
183 }
185 /* like GNU diff's --suppress-blank-empty option */
186 if (!strcmp(var, "diff.suppress-blank-empty")) {
187 diff_suppress_blank_empty = git_config_bool(var, value);
188 return 0;
189 }
191 if (!prefixcmp(var, "diff.")) {
192 const char *ep = strrchr(var, '.');
193 if (ep != var + 4) {
194 if (!strcmp(ep, ".funcname")) {
195 if (!value)
196 return config_error_nonbool(var);
197 return parse_funcname_pattern(var, ep, value);
198 }
199 }
200 }
202 return git_color_default_config(var, value, cb);
203 }
205 static char *quote_two(const char *one, const char *two)
206 {
207 int need_one = quote_c_style(one, NULL, NULL, 1);
208 int need_two = quote_c_style(two, NULL, NULL, 1);
209 struct strbuf res;
211 strbuf_init(&res, 0);
212 if (need_one + need_two) {
213 strbuf_addch(&res, '"');
214 quote_c_style(one, &res, NULL, 1);
215 quote_c_style(two, &res, NULL, 1);
216 strbuf_addch(&res, '"');
217 } else {
218 strbuf_addstr(&res, one);
219 strbuf_addstr(&res, two);
220 }
221 return strbuf_detach(&res, NULL);
222 }
224 static const char *external_diff(void)
225 {
226 static const char *external_diff_cmd = NULL;
227 static int done_preparing = 0;
229 if (done_preparing)
230 return external_diff_cmd;
231 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
232 if (!external_diff_cmd)
233 external_diff_cmd = external_diff_cmd_cfg;
234 done_preparing = 1;
235 return external_diff_cmd;
236 }
238 static struct diff_tempfile {
239 const char *name; /* filename external diff should read from */
240 char hex[41];
241 char mode[10];
242 char tmp_path[PATH_MAX];
243 } diff_temp[2];
245 static int count_lines(const char *data, int size)
246 {
247 int count, ch, completely_empty = 1, nl_just_seen = 0;
248 count = 0;
249 while (0 < size--) {
250 ch = *data++;
251 if (ch == '\n') {
252 count++;
253 nl_just_seen = 1;
254 completely_empty = 0;
255 }
256 else {
257 nl_just_seen = 0;
258 completely_empty = 0;
259 }
260 }
261 if (completely_empty)
262 return 0;
263 if (!nl_just_seen)
264 count++; /* no trailing newline */
265 return count;
266 }
268 static void print_line_count(FILE *file, int count)
269 {
270 switch (count) {
271 case 0:
272 fprintf(file, "0,0");
273 break;
274 case 1:
275 fprintf(file, "1");
276 break;
277 default:
278 fprintf(file, "1,%d", count);
279 break;
280 }
281 }
283 static void copy_file_with_prefix(FILE *file,
284 int prefix, const char *data, int size,
285 const char *set, const char *reset)
286 {
287 int ch, nl_just_seen = 1;
288 while (0 < size--) {
289 ch = *data++;
290 if (nl_just_seen) {
291 fputs(set, file);
292 putc(prefix, file);
293 }
294 if (ch == '\n') {
295 nl_just_seen = 1;
296 fputs(reset, file);
297 } else
298 nl_just_seen = 0;
299 putc(ch, file);
300 }
301 if (!nl_just_seen)
302 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
303 }
305 static void emit_rewrite_diff(const char *name_a,
306 const char *name_b,
307 struct diff_filespec *one,
308 struct diff_filespec *two,
309 struct diff_options *o)
310 {
311 int lc_a, lc_b;
312 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
313 const char *name_a_tab, *name_b_tab;
314 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
315 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
316 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
317 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
318 const char *reset = diff_get_color(color_diff, DIFF_RESET);
319 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
320 const char *a_prefix, *b_prefix;
322 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
323 a_prefix = o->b_prefix;
324 b_prefix = o->a_prefix;
325 } else {
326 a_prefix = o->a_prefix;
327 b_prefix = o->b_prefix;
328 }
330 name_a += (*name_a == '/');
331 name_b += (*name_b == '/');
332 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
333 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
335 strbuf_reset(&a_name);
336 strbuf_reset(&b_name);
337 quote_two_c_style(&a_name, a_prefix, name_a, 0);
338 quote_two_c_style(&b_name, b_prefix, name_b, 0);
340 diff_populate_filespec(one, 0);
341 diff_populate_filespec(two, 0);
342 lc_a = count_lines(one->data, one->size);
343 lc_b = count_lines(two->data, two->size);
344 fprintf(o->file,
345 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
346 metainfo, a_name.buf, name_a_tab, reset,
347 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
348 print_line_count(o->file, lc_a);
349 fprintf(o->file, " +");
350 print_line_count(o->file, lc_b);
351 fprintf(o->file, " @@%s\n", reset);
352 if (lc_a)
353 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
354 if (lc_b)
355 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
356 }
358 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
359 {
360 if (!DIFF_FILE_VALID(one)) {
361 mf->ptr = (char *)""; /* does not matter */
362 mf->size = 0;
363 return 0;
364 }
365 else if (diff_populate_filespec(one, 0))
366 return -1;
367 mf->ptr = one->data;
368 mf->size = one->size;
369 return 0;
370 }
372 struct diff_words_buffer {
373 mmfile_t text;
374 long alloc;
375 long current; /* output pointer */
376 int suppressed_newline;
377 };
379 static void diff_words_append(char *line, unsigned long len,
380 struct diff_words_buffer *buffer)
381 {
382 if (buffer->text.size + len > buffer->alloc) {
383 buffer->alloc = (buffer->text.size + len) * 3 / 2;
384 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
385 }
386 line++;
387 len--;
388 memcpy(buffer->text.ptr + buffer->text.size, line, len);
389 buffer->text.size += len;
390 }
392 struct diff_words_data {
393 struct diff_words_buffer minus, plus;
394 FILE *file;
395 };
397 static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
398 int suppress_newline)
399 {
400 const char *ptr;
401 int eol = 0;
403 if (len == 0)
404 return;
406 ptr = buffer->text.ptr + buffer->current;
407 buffer->current += len;
409 if (ptr[len - 1] == '\n') {
410 eol = 1;
411 len--;
412 }
414 fputs(diff_get_color(1, color), file);
415 fwrite(ptr, len, 1, file);
416 fputs(diff_get_color(1, DIFF_RESET), file);
418 if (eol) {
419 if (suppress_newline)
420 buffer->suppressed_newline = 1;
421 else
422 putc('\n', file);
423 }
424 }
426 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
427 {
428 struct diff_words_data *diff_words = priv;
430 if (diff_words->minus.suppressed_newline) {
431 if (line[0] != '+')
432 putc('\n', diff_words->file);
433 diff_words->minus.suppressed_newline = 0;
434 }
436 len--;
437 switch (line[0]) {
438 case '-':
439 print_word(diff_words->file,
440 &diff_words->minus, len, DIFF_FILE_OLD, 1);
441 break;
442 case '+':
443 print_word(diff_words->file,
444 &diff_words->plus, len, DIFF_FILE_NEW, 0);
445 break;
446 case ' ':
447 print_word(diff_words->file,
448 &diff_words->plus, len, DIFF_PLAIN, 0);
449 diff_words->minus.current += len;
450 break;
451 }
452 }
454 /* this executes the word diff on the accumulated buffers */
455 static void diff_words_show(struct diff_words_data *diff_words)
456 {
457 xpparam_t xpp;
458 xdemitconf_t xecfg;
459 xdemitcb_t ecb;
460 mmfile_t minus, plus;
461 int i;
463 memset(&xecfg, 0, sizeof(xecfg));
464 minus.size = diff_words->minus.text.size;
465 minus.ptr = xmalloc(minus.size);
466 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
467 for (i = 0; i < minus.size; i++)
468 if (isspace(minus.ptr[i]))
469 minus.ptr[i] = '\n';
470 diff_words->minus.current = 0;
472 plus.size = diff_words->plus.text.size;
473 plus.ptr = xmalloc(plus.size);
474 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
475 for (i = 0; i < plus.size; i++)
476 if (isspace(plus.ptr[i]))
477 plus.ptr[i] = '\n';
478 diff_words->plus.current = 0;
480 xpp.flags = XDF_NEED_MINIMAL;
481 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
482 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
483 &xpp, &xecfg, &ecb);
484 free(minus.ptr);
485 free(plus.ptr);
486 diff_words->minus.text.size = diff_words->plus.text.size = 0;
488 if (diff_words->minus.suppressed_newline) {
489 putc('\n', diff_words->file);
490 diff_words->minus.suppressed_newline = 0;
491 }
492 }
494 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
496 struct emit_callback {
497 int nparents, color_diff;
498 unsigned ws_rule;
499 sane_truncate_fn truncate;
500 const char **label_path;
501 struct diff_words_data *diff_words;
502 int *found_changesp;
503 FILE *file;
504 };
506 static void free_diff_words_data(struct emit_callback *ecbdata)
507 {
508 if (ecbdata->diff_words) {
509 /* flush buffers */
510 if (ecbdata->diff_words->minus.text.size ||
511 ecbdata->diff_words->plus.text.size)
512 diff_words_show(ecbdata->diff_words);
514 free (ecbdata->diff_words->minus.text.ptr);
515 free (ecbdata->diff_words->plus.text.ptr);
516 free(ecbdata->diff_words);
517 ecbdata->diff_words = NULL;
518 }
519 }
521 const char *diff_get_color(int diff_use_color, enum color_diff ix)
522 {
523 if (diff_use_color)
524 return diff_colors[ix];
525 return "";
526 }
528 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
529 {
530 int has_trailing_newline, has_trailing_carriage_return;
532 has_trailing_newline = (len > 0 && line[len-1] == '\n');
533 if (has_trailing_newline)
534 len--;
535 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
536 if (has_trailing_carriage_return)
537 len--;
539 fputs(set, file);
540 fwrite(line, len, 1, file);
541 fputs(reset, file);
542 if (has_trailing_carriage_return)
543 fputc('\r', file);
544 if (has_trailing_newline)
545 fputc('\n', file);
546 }
548 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
549 {
550 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
551 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
553 if (!*ws)
554 emit_line(ecbdata->file, set, reset, line, len);
555 else {
556 /* Emit just the prefix, then the rest. */
557 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
558 ws_check_emit(line + ecbdata->nparents,
559 len - ecbdata->nparents, ecbdata->ws_rule,
560 ecbdata->file, set, reset, ws);
561 }
562 }
564 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
565 {
566 const char *cp;
567 unsigned long allot;
568 size_t l = len;
570 if (ecb->truncate)
571 return ecb->truncate(line, len);
572 cp = line;
573 allot = l;
574 while (0 < l) {
575 (void) utf8_width(&cp, &l);
576 if (!cp)
577 break; /* truncated in the middle? */
578 }
579 return allot - l;
580 }
582 static void fn_out_consume(void *priv, char *line, unsigned long len)
583 {
584 int i;
585 int color;
586 struct emit_callback *ecbdata = priv;
587 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
588 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
589 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
591 *(ecbdata->found_changesp) = 1;
593 if (ecbdata->label_path[0]) {
594 const char *name_a_tab, *name_b_tab;
596 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
597 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
599 fprintf(ecbdata->file, "%s--- %s%s%s\n",
600 meta, ecbdata->label_path[0], reset, name_a_tab);
601 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
602 meta, ecbdata->label_path[1], reset, name_b_tab);
603 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
604 }
606 if (diff_suppress_blank_empty
607 && len == 2 && line[0] == ' ' && line[1] == '\n') {
608 line[0] = '\n';
609 len = 1;
610 }
612 /* This is not really necessary for now because
613 * this codepath only deals with two-way diffs.
614 */
615 for (i = 0; i < len && line[i] == '@'; i++)
616 ;
617 if (2 <= i && i < len && line[i] == ' ') {
618 ecbdata->nparents = i - 1;
619 len = sane_truncate_line(ecbdata, line, len);
620 emit_line(ecbdata->file,
621 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
622 reset, line, len);
623 if (line[len-1] != '\n')
624 putc('\n', ecbdata->file);
625 return;
626 }
628 if (len < ecbdata->nparents) {
629 emit_line(ecbdata->file, reset, reset, line, len);
630 return;
631 }
633 color = DIFF_PLAIN;
634 if (ecbdata->diff_words && ecbdata->nparents != 1)
635 /* fall back to normal diff */
636 free_diff_words_data(ecbdata);
637 if (ecbdata->diff_words) {
638 if (line[0] == '-') {
639 diff_words_append(line, len,
640 &ecbdata->diff_words->minus);
641 return;
642 } else if (line[0] == '+') {
643 diff_words_append(line, len,
644 &ecbdata->diff_words->plus);
645 return;
646 }
647 if (ecbdata->diff_words->minus.text.size ||
648 ecbdata->diff_words->plus.text.size)
649 diff_words_show(ecbdata->diff_words);
650 line++;
651 len--;
652 emit_line(ecbdata->file, plain, reset, line, len);
653 return;
654 }
655 for (i = 0; i < ecbdata->nparents && len; i++) {
656 if (line[i] == '-')
657 color = DIFF_FILE_OLD;
658 else if (line[i] == '+')
659 color = DIFF_FILE_NEW;
660 }
662 if (color != DIFF_FILE_NEW) {
663 emit_line(ecbdata->file,
664 diff_get_color(ecbdata->color_diff, color),
665 reset, line, len);
666 return;
667 }
668 emit_add_line(reset, ecbdata, line, len);
669 }
671 static char *pprint_rename(const char *a, const char *b)
672 {
673 const char *old = a;
674 const char *new = b;
675 struct strbuf name;
676 int pfx_length, sfx_length;
677 int len_a = strlen(a);
678 int len_b = strlen(b);
679 int a_midlen, b_midlen;
680 int qlen_a = quote_c_style(a, NULL, NULL, 0);
681 int qlen_b = quote_c_style(b, NULL, NULL, 0);
683 strbuf_init(&name, 0);
684 if (qlen_a || qlen_b) {
685 quote_c_style(a, &name, NULL, 0);
686 strbuf_addstr(&name, " => ");
687 quote_c_style(b, &name, NULL, 0);
688 return strbuf_detach(&name, NULL);
689 }
691 /* Find common prefix */
692 pfx_length = 0;
693 while (*old && *new && *old == *new) {
694 if (*old == '/')
695 pfx_length = old - a + 1;
696 old++;
697 new++;
698 }
700 /* Find common suffix */
701 old = a + len_a;
702 new = b + len_b;
703 sfx_length = 0;
704 while (a <= old && b <= new && *old == *new) {
705 if (*old == '/')
706 sfx_length = len_a - (old - a);
707 old--;
708 new--;
709 }
711 /*
712 * pfx{mid-a => mid-b}sfx
713 * {pfx-a => pfx-b}sfx
714 * pfx{sfx-a => sfx-b}
715 * name-a => name-b
716 */
717 a_midlen = len_a - pfx_length - sfx_length;
718 b_midlen = len_b - pfx_length - sfx_length;
719 if (a_midlen < 0)
720 a_midlen = 0;
721 if (b_midlen < 0)
722 b_midlen = 0;
724 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
725 if (pfx_length + sfx_length) {
726 strbuf_add(&name, a, pfx_length);
727 strbuf_addch(&name, '{');
728 }
729 strbuf_add(&name, a + pfx_length, a_midlen);
730 strbuf_addstr(&name, " => ");
731 strbuf_add(&name, b + pfx_length, b_midlen);
732 if (pfx_length + sfx_length) {
733 strbuf_addch(&name, '}');
734 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
735 }
736 return strbuf_detach(&name, NULL);
737 }
739 struct diffstat_t {
740 int nr;
741 int alloc;
742 struct diffstat_file {
743 char *from_name;
744 char *name;
745 char *print_name;
746 unsigned is_unmerged:1;
747 unsigned is_binary:1;
748 unsigned is_renamed:1;
749 unsigned int added, deleted;
750 } **files;
751 };
753 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
754 const char *name_a,
755 const char *name_b)
756 {
757 struct diffstat_file *x;
758 x = xcalloc(sizeof (*x), 1);
759 if (diffstat->nr == diffstat->alloc) {
760 diffstat->alloc = alloc_nr(diffstat->alloc);
761 diffstat->files = xrealloc(diffstat->files,
762 diffstat->alloc * sizeof(x));
763 }
764 diffstat->files[diffstat->nr++] = x;
765 if (name_b) {
766 x->from_name = xstrdup(name_a);
767 x->name = xstrdup(name_b);
768 x->is_renamed = 1;
769 }
770 else {
771 x->from_name = NULL;
772 x->name = xstrdup(name_a);
773 }
774 return x;
775 }
777 static void diffstat_consume(void *priv, char *line, unsigned long len)
778 {
779 struct diffstat_t *diffstat = priv;
780 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
782 if (line[0] == '+')
783 x->added++;
784 else if (line[0] == '-')
785 x->deleted++;
786 }
788 const char mime_boundary_leader[] = "------------";
790 static int scale_linear(int it, int width, int max_change)
791 {
792 /*
793 * make sure that at least one '-' is printed if there were deletions,
794 * and likewise for '+'.
795 */
796 if (max_change < 2)
797 return it;
798 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
799 }
801 static void show_name(FILE *file,
802 const char *prefix, const char *name, int len,
803 const char *reset, const char *set)
804 {
805 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
806 }
808 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
809 {
810 if (cnt <= 0)
811 return;
812 fprintf(file, "%s", set);
813 while (cnt--)
814 putc(ch, file);
815 fprintf(file, "%s", reset);
816 }
818 static void fill_print_name(struct diffstat_file *file)
819 {
820 char *pname;
822 if (file->print_name)
823 return;
825 if (!file->is_renamed) {
826 struct strbuf buf;
827 strbuf_init(&buf, 0);
828 if (quote_c_style(file->name, &buf, NULL, 0)) {
829 pname = strbuf_detach(&buf, NULL);
830 } else {
831 pname = file->name;
832 strbuf_release(&buf);
833 }
834 } else {
835 pname = pprint_rename(file->from_name, file->name);
836 }
837 file->print_name = pname;
838 }
840 static void show_stats(struct diffstat_t* data, struct diff_options *options)
841 {
842 int i, len, add, del, total, adds = 0, dels = 0;
843 int max_change = 0, max_len = 0;
844 int total_files = data->nr;
845 int width, name_width;
846 const char *reset, *set, *add_c, *del_c;
848 if (data->nr == 0)
849 return;
851 width = options->stat_width ? options->stat_width : 80;
852 name_width = options->stat_name_width ? options->stat_name_width : 50;
854 /* Sanity: give at least 5 columns to the graph,
855 * but leave at least 10 columns for the name.
856 */
857 if (width < 25)
858 width = 25;
859 if (name_width < 10)
860 name_width = 10;
861 else if (width < name_width + 15)
862 name_width = width - 15;
864 /* Find the longest filename and max number of changes */
865 reset = diff_get_color_opt(options, DIFF_RESET);
866 set = diff_get_color_opt(options, DIFF_PLAIN);
867 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
868 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
870 for (i = 0; i < data->nr; i++) {
871 struct diffstat_file *file = data->files[i];
872 int change = file->added + file->deleted;
873 fill_print_name(file);
874 len = strlen(file->print_name);
875 if (max_len < len)
876 max_len = len;
878 if (file->is_binary || file->is_unmerged)
879 continue;
880 if (max_change < change)
881 max_change = change;
882 }
884 /* Compute the width of the graph part;
885 * 10 is for one blank at the beginning of the line plus
886 * " | count " between the name and the graph.
887 *
888 * From here on, name_width is the width of the name area,
889 * and width is the width of the graph area.
890 */
891 name_width = (name_width < max_len) ? name_width : max_len;
892 if (width < (name_width + 10) + max_change)
893 width = width - (name_width + 10);
894 else
895 width = max_change;
897 for (i = 0; i < data->nr; i++) {
898 const char *prefix = "";
899 char *name = data->files[i]->print_name;
900 int added = data->files[i]->added;
901 int deleted = data->files[i]->deleted;
902 int name_len;
904 /*
905 * "scale" the filename
906 */
907 len = name_width;
908 name_len = strlen(name);
909 if (name_width < name_len) {
910 char *slash;
911 prefix = "...";
912 len -= 3;
913 name += name_len - len;
914 slash = strchr(name, '/');
915 if (slash)
916 name = slash;
917 }
919 if (data->files[i]->is_binary) {
920 show_name(options->file, prefix, name, len, reset, set);
921 fprintf(options->file, " Bin ");
922 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
923 fprintf(options->file, " -> ");
924 fprintf(options->file, "%s%d%s", add_c, added, reset);
925 fprintf(options->file, " bytes");
926 fprintf(options->file, "\n");
927 continue;
928 }
929 else if (data->files[i]->is_unmerged) {
930 show_name(options->file, prefix, name, len, reset, set);
931 fprintf(options->file, " Unmerged\n");
932 continue;
933 }
934 else if (!data->files[i]->is_renamed &&
935 (added + deleted == 0)) {
936 total_files--;
937 continue;
938 }
940 /*
941 * scale the add/delete
942 */
943 add = added;
944 del = deleted;
945 total = add + del;
946 adds += add;
947 dels += del;
949 if (width <= max_change) {
950 add = scale_linear(add, width, max_change);
951 del = scale_linear(del, width, max_change);
952 total = add + del;
953 }
954 show_name(options->file, prefix, name, len, reset, set);
955 fprintf(options->file, "%5d%s", added + deleted,
956 added + deleted ? " " : "");
957 show_graph(options->file, '+', add, add_c, reset);
958 show_graph(options->file, '-', del, del_c, reset);
959 fprintf(options->file, "\n");
960 }
961 fprintf(options->file,
962 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
963 set, total_files, adds, dels, reset);
964 }
966 static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
967 {
968 int i, adds = 0, dels = 0, total_files = data->nr;
970 if (data->nr == 0)
971 return;
973 for (i = 0; i < data->nr; i++) {
974 if (!data->files[i]->is_binary &&
975 !data->files[i]->is_unmerged) {
976 int added = data->files[i]->added;
977 int deleted= data->files[i]->deleted;
978 if (!data->files[i]->is_renamed &&
979 (added + deleted == 0)) {
980 total_files--;
981 } else {
982 adds += added;
983 dels += deleted;
984 }
985 }
986 }
987 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
988 total_files, adds, dels);
989 }
991 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
992 {
993 int i;
995 if (data->nr == 0)
996 return;
998 for (i = 0; i < data->nr; i++) {
999 struct diffstat_file *file = data->files[i];
1001 if (file->is_binary)
1002 fprintf(options->file, "-\t-\t");
1003 else
1004 fprintf(options->file,
1005 "%d\t%d\t", file->added, file->deleted);
1006 if (options->line_termination) {
1007 fill_print_name(file);
1008 if (!file->is_renamed)
1009 write_name_quoted(file->name, options->file,
1010 options->line_termination);
1011 else {
1012 fputs(file->print_name, options->file);
1013 putc(options->line_termination, options->file);
1014 }
1015 } else {
1016 if (file->is_renamed) {
1017 putc('\0', options->file);
1018 write_name_quoted(file->from_name, options->file, '\0');
1019 }
1020 write_name_quoted(file->name, options->file, '\0');
1021 }
1022 }
1023 }
1025 struct dirstat_file {
1026 const char *name;
1027 unsigned long changed;
1028 };
1030 struct dirstat_dir {
1031 struct dirstat_file *files;
1032 int alloc, nr, percent, cumulative;
1033 };
1035 static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
1036 {
1037 unsigned long this_dir = 0;
1038 unsigned int sources = 0;
1040 while (dir->nr) {
1041 struct dirstat_file *f = dir->files;
1042 int namelen = strlen(f->name);
1043 unsigned long this;
1044 char *slash;
1046 if (namelen < baselen)
1047 break;
1048 if (memcmp(f->name, base, baselen))
1049 break;
1050 slash = strchr(f->name + baselen, '/');
1051 if (slash) {
1052 int newbaselen = slash + 1 - f->name;
1053 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
1054 sources++;
1055 } else {
1056 this = f->changed;
1057 dir->files++;
1058 dir->nr--;
1059 sources += 2;
1060 }
1061 this_dir += this;
1062 }
1064 /*
1065 * We don't report dirstat's for
1066 * - the top level
1067 * - or cases where everything came from a single directory
1068 * under this directory (sources == 1).
1069 */
1070 if (baselen && sources != 1) {
1071 int permille = this_dir * 1000 / changed;
1072 if (permille) {
1073 int percent = permille / 10;
1074 if (percent >= dir->percent) {
1075 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1076 if (!dir->cumulative)
1077 return 0;
1078 }
1079 }
1080 }
1081 return this_dir;
1082 }
1084 static int dirstat_compare(const void *_a, const void *_b)
1085 {
1086 const struct dirstat_file *a = _a;
1087 const struct dirstat_file *b = _b;
1088 return strcmp(a->name, b->name);
1089 }
1091 static void show_dirstat(struct diff_options *options)
1092 {
1093 int i;
1094 unsigned long changed;
1095 struct dirstat_dir dir;
1096 struct diff_queue_struct *q = &diff_queued_diff;
1098 dir.files = NULL;
1099 dir.alloc = 0;
1100 dir.nr = 0;
1101 dir.percent = options->dirstat_percent;
1102 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1104 changed = 0;
1105 for (i = 0; i < q->nr; i++) {
1106 struct diff_filepair *p = q->queue[i];
1107 const char *name;
1108 unsigned long copied, added, damage;
1110 name = p->one->path ? p->one->path : p->two->path;
1112 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1113 diff_populate_filespec(p->one, 0);
1114 diff_populate_filespec(p->two, 0);
1115 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1116 &copied, &added);
1117 diff_free_filespec_data(p->one);
1118 diff_free_filespec_data(p->two);
1119 } else if (DIFF_FILE_VALID(p->one)) {
1120 diff_populate_filespec(p->one, 1);
1121 copied = added = 0;
1122 diff_free_filespec_data(p->one);
1123 } else if (DIFF_FILE_VALID(p->two)) {
1124 diff_populate_filespec(p->two, 1);
1125 copied = 0;
1126 added = p->two->size;
1127 diff_free_filespec_data(p->two);
1128 } else
1129 continue;
1131 /*
1132 * Original minus copied is the removed material,
1133 * added is the new material. They are both damages
1134 * made to the preimage. In --dirstat-by-file mode, count
1135 * damaged files, not damaged lines. This is done by
1136 * counting only a single damaged line per file.
1137 */
1138 damage = (p->one->size - copied) + added;
1139 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1140 damage = 1;
1142 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1143 dir.files[dir.nr].name = name;
1144 dir.files[dir.nr].changed = damage;
1145 changed += damage;
1146 dir.nr++;
1147 }
1149 /* This can happen even with many files, if everything was renames */
1150 if (!changed)
1151 return;
1153 /* Show all directories with more than x% of the changes */
1154 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1155 gather_dirstat(options->file, &dir, changed, "", 0);
1156 }
1158 static void free_diffstat_info(struct diffstat_t *diffstat)
1159 {
1160 int i;
1161 for (i = 0; i < diffstat->nr; i++) {
1162 struct diffstat_file *f = diffstat->files[i];
1163 if (f->name != f->print_name)
1164 free(f->print_name);
1165 free(f->name);
1166 free(f->from_name);
1167 free(f);
1168 }
1169 free(diffstat->files);
1170 }
1172 struct checkdiff_t {
1173 const char *filename;
1174 int lineno;
1175 struct diff_options *o;
1176 unsigned ws_rule;
1177 unsigned status;
1178 int trailing_blanks_start;
1179 };
1181 static int is_conflict_marker(const char *line, unsigned long len)
1182 {
1183 char firstchar;
1184 int cnt;
1186 if (len < 8)
1187 return 0;
1188 firstchar = line[0];
1189 switch (firstchar) {
1190 case '=': case '>': case '<':
1191 break;
1192 default:
1193 return 0;
1194 }
1195 for (cnt = 1; cnt < 7; cnt++)
1196 if (line[cnt] != firstchar)
1197 return 0;
1198 /* line[0] thru line[6] are same as firstchar */
1199 if (firstchar == '=') {
1200 /* divider between ours and theirs? */
1201 if (len != 8 || line[7] != '\n')
1202 return 0;
1203 } else if (len < 8 || !isspace(line[7])) {
1204 /* not divider before ours nor after theirs */
1205 return 0;
1206 }
1207 return 1;
1208 }
1210 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1211 {
1212 struct checkdiff_t *data = priv;
1213 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1214 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1215 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1216 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1217 char *err;
1219 if (line[0] == '+') {
1220 unsigned bad;
1221 data->lineno++;
1222 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1223 data->trailing_blanks_start = 0;
1224 else if (!data->trailing_blanks_start)
1225 data->trailing_blanks_start = data->lineno;
1226 if (is_conflict_marker(line + 1, len - 1)) {
1227 data->status |= 1;
1228 fprintf(data->o->file,
1229 "%s:%d: leftover conflict marker\n",
1230 data->filename, data->lineno);
1231 }
1232 bad = ws_check(line + 1, len - 1, data->ws_rule);
1233 if (!bad)
1234 return;
1235 data->status |= bad;
1236 err = whitespace_error_string(bad);
1237 fprintf(data->o->file, "%s:%d: %s.\n",
1238 data->filename, data->lineno, err);
1239 free(err);
1240 emit_line(data->o->file, set, reset, line, 1);
1241 ws_check_emit(line + 1, len - 1, data->ws_rule,
1242 data->o->file, set, reset, ws);
1243 } else if (line[0] == ' ') {
1244 data->lineno++;
1245 data->trailing_blanks_start = 0;
1246 } else if (line[0] == '@') {
1247 char *plus = strchr(line, '+');
1248 if (plus)
1249 data->lineno = strtol(plus, NULL, 10) - 1;
1250 else
1251 die("invalid diff");
1252 data->trailing_blanks_start = 0;
1253 }
1254 }
1256 static unsigned char *deflate_it(char *data,
1257 unsigned long size,
1258 unsigned long *result_size)
1259 {
1260 int bound;
1261 unsigned char *deflated;
1262 z_stream stream;
1264 memset(&stream, 0, sizeof(stream));
1265 deflateInit(&stream, zlib_compression_level);
1266 bound = deflateBound(&stream, size);
1267 deflated = xmalloc(bound);
1268 stream.next_out = deflated;
1269 stream.avail_out = bound;
1271 stream.next_in = (unsigned char *)data;
1272 stream.avail_in = size;
1273 while (deflate(&stream, Z_FINISH) == Z_OK)
1274 ; /* nothing */
1275 deflateEnd(&stream);
1276 *result_size = stream.total_out;
1277 return deflated;
1278 }
1280 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
1281 {
1282 void *cp;
1283 void *delta;
1284 void *deflated;
1285 void *data;
1286 unsigned long orig_size;
1287 unsigned long delta_size;
1288 unsigned long deflate_size;
1289 unsigned long data_size;
1291 /* We could do deflated delta, or we could do just deflated two,
1292 * whichever is smaller.
1293 */
1294 delta = NULL;
1295 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1296 if (one->size && two->size) {
1297 delta = diff_delta(one->ptr, one->size,
1298 two->ptr, two->size,
1299 &delta_size, deflate_size);
1300 if (delta) {
1301 void *to_free = delta;
1302 orig_size = delta_size;
1303 delta = deflate_it(delta, delta_size, &delta_size);
1304 free(to_free);
1305 }
1306 }
1308 if (delta && delta_size < deflate_size) {
1309 fprintf(file, "delta %lu\n", orig_size);
1310 free(deflated);
1311 data = delta;
1312 data_size = delta_size;
1313 }
1314 else {
1315 fprintf(file, "literal %lu\n", two->size);
1316 free(delta);
1317 data = deflated;
1318 data_size = deflate_size;
1319 }
1321 /* emit data encoded in base85 */
1322 cp = data;
1323 while (data_size) {
1324 int bytes = (52 < data_size) ? 52 : data_size;
1325 char line[70];
1326 data_size -= bytes;
1327 if (bytes <= 26)
1328 line[0] = bytes + 'A' - 1;
1329 else
1330 line[0] = bytes - 26 + 'a' - 1;
1331 encode_85(line + 1, cp, bytes);
1332 cp = (char *) cp + bytes;
1333 fputs(line, file);
1334 fputc('\n', file);
1335 }
1336 fprintf(file, "\n");
1337 free(data);
1338 }
1340 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
1341 {
1342 fprintf(file, "GIT binary patch\n");
1343 emit_binary_diff_body(file, one, two);
1344 emit_binary_diff_body(file, two, one);
1345 }
1347 static void setup_diff_attr_check(struct git_attr_check *check)
1348 {
1349 static struct git_attr *attr_diff;
1351 if (!attr_diff) {
1352 attr_diff = git_attr("diff", 4);
1353 }
1354 check[0].attr = attr_diff;
1355 }
1357 static void diff_filespec_check_attr(struct diff_filespec *one)
1358 {
1359 struct git_attr_check attr_diff_check;
1360 int check_from_data = 0;
1362 if (one->checked_attr)
1363 return;
1365 setup_diff_attr_check(&attr_diff_check);
1366 one->is_binary = 0;
1367 one->funcname_pattern_ident = NULL;
1369 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1370 const char *value;
1372 /* binaryness */
1373 value = attr_diff_check.value;
1374 if (ATTR_TRUE(value))
1375 ;
1376 else if (ATTR_FALSE(value))
1377 one->is_binary = 1;
1378 else
1379 check_from_data = 1;
1381 /* funcname pattern ident */
1382 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1383 ;
1384 else
1385 one->funcname_pattern_ident = value;
1386 }
1388 if (check_from_data) {
1389 if (!one->data && DIFF_FILE_VALID(one))
1390 diff_populate_filespec(one, 0);
1392 if (one->data)
1393 one->is_binary = buffer_is_binary(one->data, one->size);
1394 }
1395 }
1397 int diff_filespec_is_binary(struct diff_filespec *one)
1398 {
1399 diff_filespec_check_attr(one);
1400 return one->is_binary;
1401 }
1403 static const char *funcname_pattern(const char *ident)
1404 {
1405 struct funcname_pattern *pp;
1407 for (pp = funcname_pattern_list; pp; pp = pp->next)
1408 if (!strcmp(ident, pp->name))
1409 return pp->pattern;
1410 return NULL;
1411 }
1413 static struct builtin_funcname_pattern {
1414 const char *name;
1415 const char *pattern;
1416 } builtin_funcname_pattern[] = {
1417 { "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$" },
1418 { "html", "^\\s*\\(<[Hh][1-6]\\s.*>.*\\)$" },
1419 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1420 "new\\|return\\|switch\\|throw\\|while\\)\n"
1421 "^[ ]*\\(\\([ ]*"
1422 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1423 "[ ]*([^;]*\\)$" },
1424 { "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
1425 "destructor\\|interface\\|implementation\\|"
1426 "initialization\\|finalization\\)[ \t]*.*\\)$"
1427 "\\|"
1428 "^\\(.*=[ \t]*\\(class\\|record\\).*\\)$"
1429 },
1430 { "php", "^[\t ]*\\(\\(function\\|class\\).*\\)" },
1431 { "python", "^\\s*\\(\\(class\\|def\\)\\s.*\\)$" },
1432 { "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$" },
1433 { "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$" },
1434 };
1436 static const char *diff_funcname_pattern(struct diff_filespec *one)
1437 {
1438 const char *ident, *pattern;
1439 int i;
1441 diff_filespec_check_attr(one);
1442 ident = one->funcname_pattern_ident;
1444 if (!ident)
1445 /*
1446 * If the config file has "funcname.default" defined, that
1447 * regexp is used; otherwise NULL is returned and xemit uses
1448 * the built-in default.
1449 */
1450 return funcname_pattern("default");
1452 /* Look up custom "funcname.$ident" regexp from config. */
1453 pattern = funcname_pattern(ident);
1454 if (pattern)
1455 return pattern;
1457 /*
1458 * And define built-in fallback patterns here. Note that
1459 * these can be overridden by the user's config settings.
1460 */
1461 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1462 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1463 return builtin_funcname_pattern[i].pattern;
1465 return NULL;
1466 }
1468 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1469 {
1470 if (!options->a_prefix)
1471 options->a_prefix = a;
1472 if (!options->b_prefix)
1473 options->b_prefix = b;
1474 }
1476 static void builtin_diff(const char *name_a,
1477 const char *name_b,
1478 struct diff_filespec *one,
1479 struct diff_filespec *two,
1480 const char *xfrm_msg,
1481 struct diff_options *o,
1482 int complete_rewrite)
1483 {
1484 mmfile_t mf1, mf2;
1485 const char *lbl[2];
1486 char *a_one, *b_two;
1487 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1488 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1489 const char *a_prefix, *b_prefix;
1491 diff_set_mnemonic_prefix(o, "a/", "b/");
1492 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1493 a_prefix = o->b_prefix;
1494 b_prefix = o->a_prefix;
1495 } else {
1496 a_prefix = o->a_prefix;
1497 b_prefix = o->b_prefix;
1498 }
1500 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1501 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1502 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1503 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1504 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1505 if (lbl[0][0] == '/') {
1506 /* /dev/null */
1507 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
1508 if (xfrm_msg && xfrm_msg[0])
1509 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1510 }
1511 else if (lbl[1][0] == '/') {
1512 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
1513 if (xfrm_msg && xfrm_msg[0])
1514 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1515 }
1516 else {
1517 if (one->mode != two->mode) {
1518 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1519 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
1520 }
1521 if (xfrm_msg && xfrm_msg[0])
1522 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
1523 /*
1524 * we do not run diff between different kind
1525 * of objects.
1526 */
1527 if ((one->mode ^ two->mode) & S_IFMT)
1528 goto free_ab_and_return;
1529 if (complete_rewrite) {
1530 emit_rewrite_diff(name_a, name_b, one, two, o);
1531 o->found_changes = 1;
1532 goto free_ab_and_return;
1533 }
1534 }
1536 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1537 die("unable to read files to diff");
1539 if (!DIFF_OPT_TST(o, TEXT) &&
1540 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
1541 /* Quite common confusing case */
1542 if (mf1.size == mf2.size &&
1543 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1544 goto free_ab_and_return;
1545 if (DIFF_OPT_TST(o, BINARY))
1546 emit_binary_diff(o->file, &mf1, &mf2);
1547 else
1548 fprintf(o->file, "Binary files %s and %s differ\n",
1549 lbl[0], lbl[1]);
1550 o->found_changes = 1;
1551 }
1552 else {
1553 /* Crazy xdl interfaces.. */
1554 const char *diffopts = getenv("GIT_DIFF_OPTS");
1555 xpparam_t xpp;
1556 xdemitconf_t xecfg;
1557 xdemitcb_t ecb;
1558 struct emit_callback ecbdata;
1559 const char *funcname_pattern;
1561 funcname_pattern = diff_funcname_pattern(one);
1562 if (!funcname_pattern)
1563 funcname_pattern = diff_funcname_pattern(two);
1565 memset(&xecfg, 0, sizeof(xecfg));
1566 memset(&ecbdata, 0, sizeof(ecbdata));
1567 ecbdata.label_path = lbl;
1568 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1569 ecbdata.found_changesp = &o->found_changes;
1570 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1571 ecbdata.file = o->file;
1572 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1573 xecfg.ctxlen = o->context;
1574 xecfg.flags = XDL_EMIT_FUNCNAMES;
1575 if (funcname_pattern)
1576 xdiff_set_find_func(&xecfg, funcname_pattern);
1577 if (!diffopts)
1578 ;
1579 else if (!prefixcmp(diffopts, "--unified="))
1580 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1581 else if (!prefixcmp(diffopts, "-u"))
1582 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1583 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
1584 ecbdata.diff_words =
1585 xcalloc(1, sizeof(struct diff_words_data));
1586 ecbdata.diff_words->file = o->file;
1587 }
1588 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1589 &xpp, &xecfg, &ecb);
1590 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
1591 free_diff_words_data(&ecbdata);
1592 }
1594 free_ab_and_return:
1595 diff_free_filespec_data(one);
1596 diff_free_filespec_data(two);
1597 free(a_one);
1598 free(b_two);
1599 return;
1600 }
1602 static void builtin_diffstat(const char *name_a, const char *name_b,
1603 struct diff_filespec *one,
1604 struct diff_filespec *two,
1605 struct diffstat_t *diffstat,
1606 struct diff_options *o,
1607 int complete_rewrite)
1608 {
1609 mmfile_t mf1, mf2;
1610 struct diffstat_file *data;
1612 data = diffstat_add(diffstat, name_a, name_b);
1614 if (!one || !two) {
1615 data->is_unmerged = 1;
1616 return;
1617 }
1618 if (complete_rewrite) {
1619 diff_populate_filespec(one, 0);
1620 diff_populate_filespec(two, 0);
1621 data->deleted = count_lines(one->data, one->size);
1622 data->added = count_lines(two->data, two->size);
1623 goto free_and_return;
1624 }
1625 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1626 die("unable to read files to diff");
1628 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
1629 data->is_binary = 1;
1630 data->added = mf2.size;
1631 data->deleted = mf1.size;
1632 } else {
1633 /* Crazy xdl interfaces.. */
1634 xpparam_t xpp;
1635 xdemitconf_t xecfg;
1636 xdemitcb_t ecb;
1638 memset(&xecfg, 0, sizeof(xecfg));
1639 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1640 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1641 &xpp, &xecfg, &ecb);
1642 }
1644 free_and_return:
1645 diff_free_filespec_data(one);
1646 diff_free_filespec_data(two);
1647 }
1649 static void builtin_checkdiff(const char *name_a, const char *name_b,
1650 const char *attr_path,
1651 struct diff_filespec *one,
1652 struct diff_filespec *two,
1653 struct diff_options *o)
1654 {
1655 mmfile_t mf1, mf2;
1656 struct checkdiff_t data;
1658 if (!two)
1659 return;
1661 memset(&data, 0, sizeof(data));
1662 data.filename = name_b ? name_b : name_a;
1663 data.lineno = 0;
1664 data.o = o;
1665 data.ws_rule = whitespace_rule(attr_path);
1667 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1668 die("unable to read files to diff");
1670 /*
1671 * All the other codepaths check both sides, but not checking
1672 * the "old" side here is deliberate. We are checking the newly
1673 * introduced changes, and as long as the "new" side is text, we
1674 * can and should check what it introduces.
1675 */
1676 if (diff_filespec_is_binary(two))
1677 goto free_and_return;
1678 else {
1679 /* Crazy xdl interfaces.. */
1680 xpparam_t xpp;
1681 xdemitconf_t xecfg;
1682 xdemitcb_t ecb;
1684 memset(&xecfg, 0, sizeof(xecfg));
1685 xecfg.ctxlen = 1; /* at least one context line */
1686 xpp.flags = XDF_NEED_MINIMAL;
1687 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1688 &xpp, &xecfg, &ecb);
1690 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1691 data.trailing_blanks_start) {
1692 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1693 data.filename, data.trailing_blanks_start);
1694 data.status = 1; /* report errors */
1695 }
1696 }
1697 free_and_return:
1698 diff_free_filespec_data(one);
1699 diff_free_filespec_data(two);
1700 if (data.status)
1701 DIFF_OPT_SET(o, CHECK_FAILED);
1702 }
1704 struct diff_filespec *alloc_filespec(const char *path)
1705 {
1706 int namelen = strlen(path);
1707 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1709 memset(spec, 0, sizeof(*spec));
1710 spec->path = (char *)(spec + 1);
1711 memcpy(spec->path, path, namelen+1);
1712 spec->count = 1;
1713 return spec;
1714 }
1716 void free_filespec(struct diff_filespec *spec)
1717 {
1718 if (!--spec->count) {
1719 diff_free_filespec_data(spec);
1720 free(spec);
1721 }
1722 }
1724 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1725 unsigned short mode)
1726 {
1727 if (mode) {
1728 spec->mode = canon_mode(mode);
1729 hashcpy(spec->sha1, sha1);
1730 spec->sha1_valid = !is_null_sha1(sha1);
1731 }
1732 }
1734 /*
1735 * Given a name and sha1 pair, if the index tells us the file in
1736 * the work tree has that object contents, return true, so that
1737 * prepare_temp_file() does not have to inflate and extract.
1738 */
1739 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1740 {
1741 struct cache_entry *ce;
1742 struct stat st;
1743 int pos, len;
1745 /* We do not read the cache ourselves here, because the
1746 * benchmark with my previous version that always reads cache
1747 * shows that it makes things worse for diff-tree comparing
1748 * two linux-2.6 kernel trees in an already checked out work
1749 * tree. This is because most diff-tree comparisons deal with
1750 * only a small number of files, while reading the cache is
1751 * expensive for a large project, and its cost outweighs the
1752 * savings we get by not inflating the object to a temporary
1753 * file. Practically, this code only helps when we are used
1754 * by diff-cache --cached, which does read the cache before
1755 * calling us.
1756 */
1757 if (!active_cache)
1758 return 0;
1760 /* We want to avoid the working directory if our caller
1761 * doesn't need the data in a normal file, this system
1762 * is rather slow with its stat/open/mmap/close syscalls,
1763 * and the object is contained in a pack file. The pack
1764 * is probably already open and will be faster to obtain
1765 * the data through than the working directory. Loose
1766 * objects however would tend to be slower as they need
1767 * to be individually opened and inflated.
1768 */
1769 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1770 return 0;
1772 len = strlen(name);
1773 pos = cache_name_pos(name, len);
1774 if (pos < 0)
1775 return 0;
1776 ce = active_cache[pos];
1778 /*
1779 * This is not the sha1 we are looking for, or
1780 * unreusable because it is not a regular file.
1781 */
1782 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
1783 return 0;
1785 /*
1786 * If ce matches the file in the work tree, we can reuse it.
1787 */
1788 if (ce_uptodate(ce) ||
1789 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1790 return 1;
1792 return 0;
1793 }
1795 static int populate_from_stdin(struct diff_filespec *s)
1796 {
1797 struct strbuf buf;
1798 size_t size = 0;
1800 strbuf_init(&buf, 0);
1801 if (strbuf_read(&buf, 0, 0) < 0)
1802 return error("error while reading from stdin %s",
1803 strerror(errno));
1805 s->should_munmap = 0;
1806 s->data = strbuf_detach(&buf, &size);
1807 s->size = size;
1808 s->should_free = 1;
1809 return 0;
1810 }
1812 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1813 {
1814 int len;
1815 char *data = xmalloc(100);
1816 len = snprintf(data, 100,
1817 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1818 s->data = data;
1819 s->size = len;
1820 s->should_free = 1;
1821 if (size_only) {
1822 s->data = NULL;
1823 free(data);
1824 }
1825 return 0;
1826 }
1828 /*
1829 * While doing rename detection and pickaxe operation, we may need to
1830 * grab the data for the blob (or file) for our own in-core comparison.
1831 * diff_filespec has data and size fields for this purpose.
1832 */
1833 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1834 {
1835 int err = 0;
1836 if (!DIFF_FILE_VALID(s))
1837 die("internal error: asking to populate invalid file.");
1838 if (S_ISDIR(s->mode))
1839 return -1;
1841 if (s->data)
1842 return 0;
1844 if (size_only && 0 < s->size)
1845 return 0;
1847 if (S_ISGITLINK(s->mode))
1848 return diff_populate_gitlink(s, size_only);
1850 if (!s->sha1_valid ||
1851 reuse_worktree_file(s->path, s->sha1, 0)) {
1852 struct strbuf buf;
1853 struct stat st;
1854 int fd;
1856 if (!strcmp(s->path, "-"))
1857 return populate_from_stdin(s);
1859 if (lstat(s->path, &st) < 0) {
1860 if (errno == ENOENT) {
1861 err_empty:
1862 err = -1;
1863 empty:
1864 s->data = (char *)"";
1865 s->size = 0;
1866 return err;
1867 }
1868 }
1869 s->size = xsize_t(st.st_size);
1870 if (!s->size)
1871 goto empty;
1872 if (size_only)
1873 return 0;
1874 if (S_ISLNK(st.st_mode)) {
1875 int ret;
1876 s->data = xmalloc(s->size);
1877 s->should_free = 1;
1878 ret = readlink(s->path, s->data, s->size);
1879 if (ret < 0) {
1880 free(s->data);
1881 goto err_empty;
1882 }
1883 return 0;
1884 }
1885 fd = open(s->path, O_RDONLY);
1886 if (fd < 0)
1887 goto err_empty;
1888 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1889 close(fd);
1890 s->should_munmap = 1;
1892 /*
1893 * Convert from working tree format to canonical git format
1894 */
1895 strbuf_init(&buf, 0);
1896 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
1897 size_t size = 0;
1898 munmap(s->data, s->size);
1899 s->should_munmap = 0;
1900 s->data = strbuf_detach(&buf, &size);
1901 s->size = size;
1902 s->should_free = 1;
1903 }
1904 }
1905 else {
1906 enum object_type type;
1907 if (size_only)
1908 type = sha1_object_info(s->sha1, &s->size);
1909 else {
1910 s->data = read_sha1_file(s->sha1, &type, &s->size);
1911 s->should_free = 1;
1912 }
1913 }
1914 return 0;
1915 }
1917 void diff_free_filespec_blob(struct diff_filespec *s)
1918 {
1919 if (s->should_free)
1920 free(s->data);
1921 else if (s->should_munmap)
1922 munmap(s->data, s->size);
1924 if (s->should_free || s->should_munmap) {
1925 s->should_free = s->should_munmap = 0;
1926 s->data = NULL;
1927 }
1928 }
1930 void diff_free_filespec_data(struct diff_filespec *s)
1931 {
1932 diff_free_filespec_blob(s);
1933 free(s->cnt_data);
1934 s->cnt_data = NULL;
1935 }
1937 static void prep_temp_blob(struct diff_tempfile *temp,
1938 void *blob,
1939 unsigned long size,
1940 const unsigned char *sha1,
1941 int mode)
1942 {
1943 int fd;
1945 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
1946 if (fd < 0)
1947 die("unable to create temp-file: %s", strerror(errno));
1948 if (write_in_full(fd, blob, size) != size)
1949 die("unable to write temp-file");
1950 close(fd);
1951 temp->name = temp->tmp_path;
1952 strcpy(temp->hex, sha1_to_hex(sha1));
1953 temp->hex[40] = 0;
1954 sprintf(temp->mode, "%06o", mode);
1955 }
1957 static void prepare_temp_file(const char *name,
1958 struct diff_tempfile *temp,
1959 struct diff_filespec *one)
1960 {
1961 if (!DIFF_FILE_VALID(one)) {
1962 not_a_valid_file:
1963 /* A '-' entry produces this for file-2, and
1964 * a '+' entry produces this for file-1.
1965 */
1966 temp->name = "/dev/null";
1967 strcpy(temp->hex, ".");
1968 strcpy(temp->mode, ".");
1969 return;
1970 }
1972 if (!one->sha1_valid ||
1973 reuse_worktree_file(name, one->sha1, 1)) {
1974 struct stat st;
1975 if (lstat(name, &st) < 0) {
1976 if (errno == ENOENT)
1977 goto not_a_valid_file;
1978 die("stat(%s): %s", name, strerror(errno));
1979 }
1980 if (S_ISLNK(st.st_mode)) {
1981 int ret;
1982 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1983 size_t sz = xsize_t(st.st_size);
1984 if (sizeof(buf) <= st.st_size)
1985 die("symlink too long: %s", name);
1986 ret = readlink(name, buf, sz);
1987 if (ret < 0)
1988 die("readlink(%s)", name);
1989 prep_temp_blob(temp, buf, sz,
1990 (one->sha1_valid ?
1991 one->sha1 : null_sha1),
1992 (one->sha1_valid ?
1993 one->mode : S_IFLNK));
1994 }
1995 else {
1996 /* we can borrow from the file in the work tree */
1997 temp->name = name;
1998 if (!one->sha1_valid)
1999 strcpy(temp->hex, sha1_to_hex(null_sha1));
2000 else
2001 strcpy(temp->hex, sha1_to_hex(one->sha1));
2002 /* Even though we may sometimes borrow the
2003 * contents from the work tree, we always want
2004 * one->mode. mode is trustworthy even when
2005 * !(one->sha1_valid), as long as
2006 * DIFF_FILE_VALID(one).
2007 */
2008 sprintf(temp->mode, "%06o", one->mode);
2009 }
2010 return;
2011 }
2012 else {
2013 if (diff_populate_filespec(one, 0))
2014 die("cannot read data blob for %s", one->path);
2015 prep_temp_blob(temp, one->data, one->size,
2016 one->sha1, one->mode);
2017 }
2018 }
2020 static void remove_tempfile(void)
2021 {
2022 int i;
2024 for (i = 0; i < 2; i++)
2025 if (diff_temp[i].name == diff_temp[i].tmp_path) {
2026 unlink(diff_temp[i].name);
2027 diff_temp[i].name = NULL;
2028 }
2029 }
2031 static void remove_tempfile_on_signal(int signo)
2032 {
2033 remove_tempfile();
2034 signal(SIGINT, SIG_DFL);
2035 raise(signo);
2036 }
2038 /* An external diff command takes:
2039 *
2040 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2041 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2042 *
2043 */
2044 static void run_external_diff(const char *pgm,
2045 const char *name,
2046 const char *other,
2047 struct diff_filespec *one,
2048 struct diff_filespec *two,
2049 const char *xfrm_msg,
2050 int complete_rewrite)
2051 {
2052 const char *spawn_arg[10];
2053 struct diff_tempfile *temp = diff_temp;
2054 int retval;
2055 static int atexit_asked = 0;
2056 const char *othername;
2057 const char **arg = &spawn_arg[0];
2059 othername = (other? other : name);
2060 if (one && two) {
2061 prepare_temp_file(name, &temp[0], one);
2062 prepare_temp_file(othername, &temp[1], two);
2063 if (! atexit_asked &&
2064 (temp[0].name == temp[0].tmp_path ||
2065 temp[1].name == temp[1].tmp_path)) {
2066 atexit_asked = 1;
2067 atexit(remove_tempfile);
2068 }
2069 signal(SIGINT, remove_tempfile_on_signal);
2070 }
2072 if (one && two) {
2073 *arg++ = pgm;
2074 *arg++ = name;
2075 *arg++ = temp[0].name;
2076 *arg++ = temp[0].hex;
2077 *arg++ = temp[0].mode;
2078 *arg++ = temp[1].name;
2079 *arg++ = temp[1].hex;
2080 *arg++ = temp[1].mode;
2081 if (other) {
2082 *arg++ = other;
2083 *arg++ = xfrm_msg;
2084 }
2085 } else {
2086 *arg++ = pgm;
2087 *arg++ = name;
2088 }
2089 *arg = NULL;
2090 fflush(NULL);
2091 retval = run_command_v_opt(spawn_arg, 0);
2092 remove_tempfile();
2093 if (retval) {
2094 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2095 exit(1);
2096 }
2097 }
2099 static const char *external_diff_attr(const char *name)
2100 {
2101 struct git_attr_check attr_diff_check;
2103 if (!name)
2104 return NULL;
2106 setup_diff_attr_check(&attr_diff_check);
2107 if (!git_checkattr(name, 1, &attr_diff_check)) {
2108 const char *value = attr_diff_check.value;
2109 if (!ATTR_TRUE(value) &&
2110 !ATTR_FALSE(value) &&
2111 !ATTR_UNSET(value)) {
2112 struct ll_diff_driver *drv;
2114 for (drv = user_diff; drv; drv = drv->next)
2115 if (!strcmp(drv->name, value))
2116 return drv->cmd;
2117 }
2118 }
2119 return NULL;
2120 }
2122 static void run_diff_cmd(const char *pgm,
2123 const char *name,
2124 const char *other,
2125 const char *attr_path,
2126 struct diff_filespec *one,
2127 struct diff_filespec *two,
2128 const char *xfrm_msg,
2129 struct diff_options *o,
2130 int complete_rewrite)
2131 {
2132 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2133 pgm = NULL;
2134 else {
2135 const char *cmd = external_diff_attr(attr_path);
2136 if (cmd)
2137 pgm = cmd;
2138 }
2140 if (pgm) {
2141 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2142 complete_rewrite);
2143 return;
2144 }
2145 if (one && two)
2146 builtin_diff(name, other ? other : name,
2147 one, two, xfrm_msg, o, complete_rewrite);
2148 else
2149 fprintf(o->file, "* Unmerged path %s\n", name);
2150 }
2152 static void diff_fill_sha1_info(struct diff_filespec *one)
2153 {
2154 if (DIFF_FILE_VALID(one)) {
2155 if (!one->sha1_valid) {
2156 struct stat st;
2157 if (!strcmp(one->path, "-")) {
2158 hashcpy(one->sha1, null_sha1);
2159 return;
2160 }
2161 if (lstat(one->path, &st) < 0)
2162 die("stat %s", one->path);
2163 if (index_path(one->sha1, one->path, &st, 0))
2164 die("cannot hash %s\n", one->path);
2165 }
2166 }
2167 else
2168 hashclr(one->sha1);
2169 }
2171 static int similarity_index(struct diff_filepair *p)
2172 {
2173 return p->score * 100 / MAX_SCORE;
2174 }
2176 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2177 {
2178 /* Strip the prefix but do not molest /dev/null and absolute paths */
2179 if (*namep && **namep != '/')
2180 *namep += prefix_length;
2181 if (*otherp && **otherp != '/')
2182 *otherp += prefix_length;
2183 }
2185 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2186 {
2187 const char *pgm = external_diff();
2188 struct strbuf msg;
2189 char *xfrm_msg;
2190 struct diff_filespec *one = p->one;
2191 struct diff_filespec *two = p->two;
2192 const char *name;
2193 const char *other;
2194 const char *attr_path;
2195 int complete_rewrite = 0;
2197 name = p->one->path;
2198 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2199 attr_path = name;
2200 if (o->prefix_length)
2201 strip_prefix(o->prefix_length, &name, &other);
2203 if (DIFF_PAIR_UNMERGED(p)) {
2204 run_diff_cmd(pgm, name, NULL, attr_path,
2205 NULL, NULL, NULL, o, 0);
2206 return;
2207 }
2209 diff_fill_sha1_info(one);
2210 diff_fill_sha1_info(two);
2212 strbuf_init(&msg, PATH_MAX * 2 + 300);
2213 switch (p->status) {
2214 case DIFF_STATUS_COPIED:
2215 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2216 strbuf_addstr(&msg, "\ncopy from ");
2217 quote_c_style(name, &msg, NULL, 0);
2218 strbuf_addstr(&msg, "\ncopy to ");
2219 quote_c_style(other, &msg, NULL, 0);
2220 strbuf_addch(&msg, '\n');
2221 break;
2222 case DIFF_STATUS_RENAMED:
2223 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2224 strbuf_addstr(&msg, "\nrename from ");
2225 quote_c_style(name, &msg, NULL, 0);
2226 strbuf_addstr(&msg, "\nrename to ");
2227 quote_c_style(other, &msg, NULL, 0);
2228 strbuf_addch(&msg, '\n');
2229 break;
2230 case DIFF_STATUS_MODIFIED:
2231 if (p->score) {
2232 strbuf_addf(&msg, "dissimilarity index %d%%\n",
2233 similarity_index(p));
2234 complete_rewrite = 1;
2235 break;
2236 }
2237 /* fallthru */
2238 default:
2239 /* nothing */
2240 ;
2241 }
2243 if (hashcmp(one->sha1, two->sha1)) {
2244 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2246 if (DIFF_OPT_TST(o, BINARY)) {
2247 mmfile_t mf;
2248 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2249 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2250 abbrev = 40;
2251 }
2252 strbuf_addf(&msg, "index %.*s..%.*s",
2253 abbrev, sha1_to_hex(one->sha1),
2254 abbrev, sha1_to_hex(two->sha1));
2255 if (one->mode == two->mode)
2256 strbuf_addf(&msg, " %06o", one->mode);
2257 strbuf_addch(&msg, '\n');
2258 }
2260 if (msg.len)
2261 strbuf_setlen(&msg, msg.len - 1);
2262 xfrm_msg = msg.len ? msg.buf : NULL;
2264 if (!pgm &&
2265 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2266 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2267 /* a filepair that changes between file and symlink
2268 * needs to be split into deletion and creation.
2269 */
2270 struct diff_filespec *null = alloc_filespec(two->path);
2271 run_diff_cmd(NULL, name, other, attr_path,
2272 one, null, xfrm_msg, o, 0);
2273 free(null);
2274 null = alloc_filespec(one->path);
2275 run_diff_cmd(NULL, name, other, attr_path,
2276 null, two, xfrm_msg, o, 0);
2277 free(null);
2278 }
2279 else
2280 run_diff_cmd(pgm, name, other, attr_path,
2281 one, two, xfrm_msg, o, complete_rewrite);
2283 strbuf_release(&msg);
2284 }
2286 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2287 struct diffstat_t *diffstat)
2288 {
2289 const char *name;
2290 const char *other;
2291 int complete_rewrite = 0;
2293 if (DIFF_PAIR_UNMERGED(p)) {
2294 /* unmerged */
2295 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2296 return;
2297 }
2299 name = p->one->path;
2300 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2302 if (o->prefix_length)
2303 strip_prefix(o->prefix_length, &name, &other);
2305 diff_fill_sha1_info(p->one);
2306 diff_fill_sha1_info(p->two);
2308 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2309 complete_rewrite = 1;
2310 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2311 }
2313 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2314 {
2315 const char *name;
2316 const char *other;
2317 const char *attr_path;
2319 if (DIFF_PAIR_UNMERGED(p)) {
2320 /* unmerged */
2321 return;
2322 }
2324 name = p->one->path;
2325 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2326 attr_path = other ? other : name;
2328 if (o->prefix_length)
2329 strip_prefix(o->prefix_length, &name, &other);
2331 diff_fill_sha1_info(p->one);
2332 diff_fill_sha1_info(p->two);
2334 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2335 }
2337 void diff_setup(struct diff_options *options)
2338 {
2339 memset(options, 0, sizeof(*options));
2341 options->file = stdout;
2343 options->line_termination = '\n';
2344 options->break_opt = -1;
2345 options->rename_limit = -1;
2346 options->dirstat_percent = 3;
2347 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
2348 options->context = 3;
2350 options->change = diff_change;
2351 options->add_remove = diff_addremove;
2352 if (diff_use_color_default > 0)
2353 DIFF_OPT_SET(options, COLOR_DIFF);
2354 else
2355 DIFF_OPT_CLR(options, COLOR_DIFF);
2356 options->detect_rename = diff_detect_rename_default;
2358 if (!diff_mnemonic_prefix) {
2359 options->a_prefix = "a/";
2360 options->b_prefix = "b/";
2361 }
2362 }
2364 int diff_setup_done(struct diff_options *options)
2365 {
2366 int count = 0;
2368 if (options->output_format & DIFF_FORMAT_NAME)
2369 count++;
2370 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2371 count++;
2372 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2373 count++;
2374 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2375 count++;
2376 if (count > 1)
2377 die("--name-only, --name-status, --check and -s are mutually exclusive");
2379 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2380 options->detect_rename = DIFF_DETECT_COPY;
2382 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2383 options->prefix = NULL;
2384 if (options->prefix)
2385 options->prefix_length = strlen(options->prefix);
2386 else
2387 options->prefix_length = 0;
2389 if (options->output_format & (DIFF_FORMAT_NAME |
2390 DIFF_FORMAT_NAME_STATUS |
2391 DIFF_FORMAT_CHECKDIFF |
2392 DIFF_FORMAT_NO_OUTPUT))
2393 options->output_format &= ~(DIFF_FORMAT_RAW |
2394 DIFF_FORMAT_NUMSTAT |
2395 DIFF_FORMAT_DIFFSTAT |
2396 DIFF_FORMAT_SHORTSTAT |
2397 DIFF_FORMAT_DIRSTAT |
2398 DIFF_FORMAT_SUMMARY |
2399 DIFF_FORMAT_PATCH);
2401 /*
2402 * These cases always need recursive; we do not drop caller-supplied
2403 * recursive bits for other formats here.
2404 */
2405 if (options->output_format & (DIFF_FORMAT_PATCH |
2406 DIFF_FORMAT_NUMSTAT |
2407 DIFF_FORMAT_DIFFSTAT |
2408 DIFF_FORMAT_SHORTSTAT |
2409 DIFF_FORMAT_DIRSTAT |
2410 DIFF_FORMAT_SUMMARY |
2411 DIFF_FORMAT_CHECKDIFF))
2412 DIFF_OPT_SET(options, RECURSIVE);
2413 /*
2414 * Also pickaxe would not work very well if you do not say recursive
2415 */
2416 if (options->pickaxe)
2417 DIFF_OPT_SET(options, RECURSIVE);
2419 if (options->detect_rename && options->rename_limit < 0)
2420 options->rename_limit = diff_rename_limit_default;
2421 if (options->setup & DIFF_SETUP_USE_CACHE) {
2422 if (!active_cache)
2423 /* read-cache does not die even when it fails
2424 * so it is safe for us to do this here. Also
2425 * it does not smudge active_cache or active_nr
2426 * when it fails, so we do not have to worry about
2427 * cleaning it up ourselves either.
2428 */
2429 read_cache();
2430 }
2431 if (options->abbrev <= 0 || 40 < options->abbrev)
2432 options->abbrev = 40; /* full */
2434 /*
2435 * It does not make sense to show the first hit we happened
2436 * to have found. It does not make sense not to return with
2437 * exit code in such a case either.
2438 */
2439 if (DIFF_OPT_TST(options, QUIET)) {
2440 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2441 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2442 }
2444 return 0;
2445 }
2447 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2448 {
2449 char c, *eq;
2450 int len;
2452 if (*arg != '-')
2453 return 0;
2454 c = *++arg;
2455 if (!c)
2456 return 0;
2457 if (c == arg_short) {
2458 c = *++arg;
2459 if (!c)
2460 return 1;
2461 if (val && isdigit(c)) {
2462 char *end;
2463 int n = strtoul(arg, &end, 10);
2464 if (*end)
2465 return 0;
2466 *val = n;
2467 return 1;
2468 }
2469 return 0;
2470 }
2471 if (c != '-')
2472 return 0;
2473 arg++;
2474 eq = strchr(arg, '=');
2475 if (eq)
2476 len = eq - arg;
2477 else
2478 len = strlen(arg);
2479 if (!len || strncmp(arg, arg_long, len))
2480 return 0;
2481 if (eq) {
2482 int n;
2483 char *end;
2484 if (!isdigit(*++eq))
2485 return 0;
2486 n = strtoul(eq, &end, 10);
2487 if (*end)
2488 return 0;
2489 *val = n;
2490 }
2491 return 1;
2492 }
2494 static int diff_scoreopt_parse(const char *opt);
2496 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2497 {
2498 const char *arg = av[0];
2500 /* Output format options */
2501 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2502 options->output_format |= DIFF_FORMAT_PATCH;
2503 else if (opt_arg(arg, 'U', "unified", &options->context))
2504 options->output_format |= DIFF_FORMAT_PATCH;
2505 else if (!strcmp(arg, "--raw"))
2506 options->output_format |= DIFF_FORMAT_RAW;
2507 else if (!strcmp(arg, "--patch-with-raw"))
2508 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2509 else if (!strcmp(arg, "--numstat"))
2510 options->output_format |= DIFF_FORMAT_NUMSTAT;
2511 else if (!strcmp(arg, "--shortstat"))
2512 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2513 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2514 options->output_format |= DIFF_FORMAT_DIRSTAT;
2515 else if (!strcmp(arg, "--cumulative")) {
2516 options->output_format |= DIFF_FORMAT_DIRSTAT;
2517 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
2518 } else if (opt_arg(arg, 0, "dirstat-by-file",
2519 &options->dirstat_percent)) {
2520 options->output_format |= DIFF_FORMAT_DIRSTAT;
2521 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
2522 }
2523 else if (!strcmp(arg, "--check"))
2524 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2525 else if (!strcmp(arg, "--summary"))
2526 options->output_format |= DIFF_FORMAT_SUMMARY;
2527 else if (!strcmp(arg, "--patch-with-stat"))
2528 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2529 else if (!strcmp(arg, "--name-only"))
2530 options->output_format |= DIFF_FORMAT_NAME;
2531 else if (!strcmp(arg, "--name-status"))
2532 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2533 else if (!strcmp(arg, "-s"))
2534 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2535 else if (!prefixcmp(arg, "--stat")) {
2536 char *end;
2537 int width = options->stat_width;
2538 int name_width = options->stat_name_width;
2539 arg += 6;
2540 end = (char *)arg;
2542 switch (*arg) {
2543 case '-':
2544 if (!prefixcmp(arg, "-width="))
2545 width = strtoul(arg + 7, &end, 10);
2546 else if (!prefixcmp(arg, "-name-width="))
2547 name_width = strtoul(arg + 12, &end, 10);
2548 break;
2549 case '=':
2550 width = strtoul(arg+1, &end, 10);
2551 if (*end == ',')
2552 name_width = strtoul(end+1, &end, 10);
2553 }
2555 /* Important! This checks all the error cases! */
2556 if (*end)
2557 return 0;
2558 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2559 options->stat_name_width = name_width;
2560 options->stat_width = width;
2561 }
2563 /* renames options */
2564 else if (!prefixcmp(arg, "-B")) {
2565 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
2566 return -1;
2567 }
2568 else if (!prefixcmp(arg, "-M")) {
2569 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2570 return -1;
2571 options->detect_rename = DIFF_DETECT_RENAME;
2572 }
2573 else if (!prefixcmp(arg, "-C")) {
2574 if (options->detect_rename == DIFF_DETECT_COPY)
2575 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2576 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
2577 return -1;
2578 options->detect_rename = DIFF_DETECT_COPY;
2579 }
2580 else if (!strcmp(arg, "--no-renames"))
2581 options->detect_rename = 0;
2582 else if (!strcmp(arg, "--relative"))
2583 DIFF_OPT_SET(options, RELATIVE_NAME);
2584 else if (!prefixcmp(arg, "--relative=")) {
2585 DIFF_OPT_SET(options, RELATIVE_NAME);
2586 options->prefix = arg + 11;
2587 }
2589 /* xdiff options */
2590 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2591 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2592 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2593 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2594 else if (!strcmp(arg, "--ignore-space-at-eol"))
2595 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2597 /* flags options */
2598 else if (!strcmp(arg, "--binary")) {
2599 options->output_format |= DIFF_FORMAT_PATCH;
2600 DIFF_OPT_SET(options, BINARY);
2601 }
2602 else if (!strcmp(arg, "--full-index"))
2603 DIFF_OPT_SET(options, FULL_INDEX);
2604 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2605 DIFF_OPT_SET(options, TEXT);
2606 else if (!strcmp(arg, "-R"))
2607 DIFF_OPT_SET(options, REVERSE_DIFF);
2608 else if (!strcmp(arg, "--find-copies-harder"))
2609 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2610 else if (!strcmp(arg, "--follow"))
2611 DIFF_OPT_SET(options, FOLLOW_RENAMES);
2612 else if (!strcmp(arg, "--color"))
2613 DIFF_OPT_SET(options, COLOR_DIFF);
2614 else if (!strcmp(arg, "--no-color"))
2615 DIFF_OPT_CLR(options, COLOR_DIFF);
2616 else if (!strcmp(arg, "--color-words"))
2617 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
2618 else if (!strcmp(arg, "--exit-code"))
2619 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2620 else if (!strcmp(arg, "--quiet"))
2621 DIFF_OPT_SET(options, QUIET);
2622 else if (!strcmp(arg, "--ext-diff"))
2623 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
2624 else if (!strcmp(arg, "--no-ext-diff"))
2625 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
2626 else if (!strcmp(arg, "--ignore-submodules"))
2627 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
2629 /* misc options */
2630 else if (!strcmp(arg, "-z"))
2631 options->line_termination = 0;
2632 else if (!prefixcmp(arg, "-l"))
2633 options->rename_limit = strtoul(arg+2, NULL, 10);
2634 else if (!prefixcmp(arg, "-S"))
2635 options->pickaxe = arg + 2;
2636 else if (!strcmp(arg, "--pickaxe-all"))
2637 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2638 else if (!strcmp(arg, "--pickaxe-regex"))
2639 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2640 else if (!prefixcmp(arg, "-O"))
2641 options->orderfile = arg + 2;
2642 else if (!prefixcmp(arg, "--diff-filter="))
2643 options->filter = arg + 14;
2644 else if (!strcmp(arg, "--abbrev"))
2645 options->abbrev = DEFAULT_ABBREV;
2646 else if (!prefixcmp(arg, "--abbrev=")) {
2647 options->abbrev = strtoul(arg + 9, NULL, 10);
2648 if (options->abbrev < MINIMUM_ABBREV)
2649 options->abbrev = MINIMUM_ABBREV;
2650 else if (40 < options->abbrev)
2651 options->abbrev = 40;
2652 }
2653 else if (!prefixcmp(arg, "--src-prefix="))
2654 options->a_prefix = arg + 13;
2655 else if (!prefixcmp(arg, "--dst-prefix="))
2656 options->b_prefix = arg + 13;
2657 else if (!strcmp(arg, "--no-prefix"))
2658 options->a_prefix = options->b_prefix = "";
2659 else if (!prefixcmp(arg, "--output=")) {
2660 options->file = fopen(arg + strlen("--output="), "w");
2661 options->close_file = 1;
2662 } else
2663 return 0;
2664 return 1;
2665 }
2667 static int parse_num(const char **cp_p)
2668 {
2669 unsigned long num, scale;
2670 int ch, dot;
2671 const char *cp = *cp_p;
2673 num = 0;
2674 scale = 1;
2675 dot = 0;
2676 for(;;) {
2677 ch = *cp;
2678 if ( !dot && ch == '.' ) {
2679 scale = 1;
2680 dot = 1;
2681 } else if ( ch == '%' ) {
2682 scale = dot ? scale*100 : 100;
2683 cp++; /* % is always at the end */
2684 break;
2685 } else if ( ch >= '0' && ch <= '9' ) {
2686 if ( scale < 100000 ) {
2687 scale *= 10;
2688 num = (num*10) + (ch-'0');
2689 }
2690 } else {
2691 break;
2692 }
2693 cp++;
2694 }
2695 *cp_p = cp;
2697 /* user says num divided by scale and we say internally that
2698 * is MAX_SCORE * num / scale.
2699 */
2700 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2701 }
2703 static int diff_scoreopt_parse(const char *opt)
2704 {
2705 int opt1, opt2, cmd;
2707 if (*opt++ != '-')
2708 return -1;
2709 cmd = *opt++;
2710 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2711 return -1; /* that is not a -M, -C nor -B option */
2713 opt1 = parse_num(&opt);
2714 if (cmd != 'B')
2715 opt2 = 0;
2716 else {
2717 if (*opt == 0)
2718 opt2 = 0;
2719 else if (*opt != '/')
2720 return -1; /* we expect -B80/99 or -B80 */
2721 else {
2722 opt++;
2723 opt2 = parse_num(&opt);
2724 }
2725 }
2726 if (*opt != 0)
2727 return -1;
2728 return opt1 | (opt2 << 16);
2729 }
2731 struct diff_queue_struct diff_queued_diff;
2733 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2734 {
2735 if (queue->alloc <= queue->nr) {
2736 queue->alloc = alloc_nr(queue->alloc);
2737 queue->queue = xrealloc(queue->queue,
2738 sizeof(dp) * queue->alloc);
2739 }
2740 queue->queue[queue->nr++] = dp;
2741 }
2743 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2744 struct diff_filespec *one,
2745 struct diff_filespec *two)
2746 {
2747 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2748 dp->one = one;
2749 dp->two = two;
2750 if (queue)
2751 diff_q(queue, dp);
2752 return dp;
2753 }
2755 void diff_free_filepair(struct diff_filepair *p)
2756 {
2757 free_filespec(p->one);
2758 free_filespec(p->two);
2759 free(p);
2760 }
2762 /* This is different from find_unique_abbrev() in that
2763 * it stuffs the result with dots for alignment.
2764 */
2765 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2766 {
2767 int abblen;
2768 const char *abbrev;
2769 if (len == 40)
2770 return sha1_to_hex(sha1);
2772 abbrev = find_unique_abbrev(sha1, len);
2773 abblen = strlen(abbrev);
2774 if (abblen < 37) {
2775 static char hex[41];
2776 if (len < abblen && abblen <= len + 2)
2777 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2778 else
2779 sprintf(hex, "%s...", abbrev);
2780 return hex;
2781 }
2782 return sha1_to_hex(sha1);
2783 }
2785 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
2786 {
2787 int line_termination = opt->line_termination;
2788 int inter_name_termination = line_termination ? '\t' : '\0';
2790 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2791 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2792 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2793 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
2794 }
2795 if (p->score) {
2796 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2797 inter_name_termination);
2798 } else {
2799 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
2800 }
2802 if (p->status == DIFF_STATUS_COPIED ||
2803 p->status == DIFF_STATUS_RENAMED) {
2804 const char *name_a, *name_b;
2805 name_a = p->one->path;
2806 name_b = p->two->path;
2807 strip_prefix(opt->prefix_length, &name_a, &name_b);
2808 write_name_quoted(name_a, opt->file, inter_name_termination);
2809 write_name_quoted(name_b, opt->file, line_termination);
2810 } else {
2811 const char *name_a, *name_b;
2812 name_a = p->one->mode ? p->one->path : p->two->path;
2813 name_b = NULL;
2814 strip_prefix(opt->prefix_length, &name_a, &name_b);
2815 write_name_quoted(name_a, opt->file, line_termination);
2816 }
2817 }
2819 int diff_unmodified_pair(struct diff_filepair *p)
2820 {
2821 /* This function is written stricter than necessary to support
2822 * the currently implemented transformers, but the idea is to
2823 * let transformers to produce diff_filepairs any way they want,
2824 * and filter and clean them up here before producing the output.
2825 */
2826 struct diff_filespec *one = p->one, *two = p->two;
2828 if (DIFF_PAIR_UNMERGED(p))
2829 return 0; /* unmerged is interesting */
2831 /* deletion, addition, mode or type change
2832 * and rename are all interesting.
2833 */
2834 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2835 DIFF_PAIR_MODE_CHANGED(p) ||
2836 strcmp(one->path, two->path))
2837 return 0;
2839 /* both are valid and point at the same path. that is, we are
2840 * dealing with a change.
2841 */
2842 if (one->sha1_valid && two->sha1_valid &&
2843 !hashcmp(one->sha1, two->sha1))
2844 return 1; /* no change */
2845 if (!one->sha1_valid && !two->sha1_valid)
2846 return 1; /* both look at the same file on the filesystem. */
2847 return 0;
2848 }
2850 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2851 {
2852 if (diff_unmodified_pair(p))
2853 return;
2855 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2856 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2857 return; /* no tree diffs in patch format */
2859 run_diff(p, o);
2860 }
2862 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2863 struct diffstat_t *diffstat)
2864 {
2865 if (diff_unmodified_pair(p))
2866 return;
2868 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2869 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2870 return; /* no tree diffs in patch format */
2872 run_diffstat(p, o, diffstat);
2873 }
2875 static void diff_flush_checkdiff(struct diff_filepair *p,
2876 struct diff_options *o)
2877 {
2878 if (diff_unmodified_pair(p))
2879 return;
2881 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2882 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2883 return; /* no tree diffs in patch format */
2885 run_checkdiff(p, o);
2886 }
2888 int diff_queue_is_empty(void)
2889 {
2890 struct diff_queue_struct *q = &diff_queued_diff;
2891 int i;
2892 for (i = 0; i < q->nr; i++)
2893 if (!diff_unmodified_pair(q->queue[i]))
2894 return 0;
2895 return 1;
2896 }
2898 #if DIFF_DEBUG
2899 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2900 {
2901 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2902 x, one ? one : "",
2903 s->path,
2904 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2905 s->mode,
2906 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2907 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2908 x, one ? one : "",
2909 s->size, s->xfrm_flags);
2910 }
2912 void diff_debug_filepair(const struct diff_filepair *p, int i)
2913 {
2914 diff_debug_filespec(p->one, i, "one");
2915 diff_debug_filespec(p->two, i, "two");
2916 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
2917 p->score, p->status ? p->status : '?',
2918 p->one->rename_used, p->broken_pair);
2919 }
2921 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2922 {
2923 int i;
2924 if (msg)
2925 fprintf(stderr, "%s\n", msg);
2926 fprintf(stderr, "q->nr = %d\n", q->nr);
2927 for (i = 0; i < q->nr; i++) {
2928 struct diff_filepair *p = q->queue[i];
2929 diff_debug_filepair(p, i);
2930 }
2931 }
2932 #endif
2934 static void diff_resolve_rename_copy(void)
2935 {
2936 int i;
2937 struct diff_filepair *p;
2938 struct diff_queue_struct *q = &diff_queued_diff;
2940 diff_debug_queue("resolve-rename-copy", q);
2942 for (i = 0; i < q->nr; i++) {
2943 p = q->queue[i];
2944 p->status = 0; /* undecided */
2945 if (DIFF_PAIR_UNMERGED(p))
2946 p->status = DIFF_STATUS_UNMERGED;
2947 else if (!DIFF_FILE_VALID(p->one))
2948 p->status = DIFF_STATUS_ADDED;
2949 else if (!DIFF_FILE_VALID(p->two))
2950 p->status = DIFF_STATUS_DELETED;
2951 else if (DIFF_PAIR_TYPE_CHANGED(p))
2952 p->status = DIFF_STATUS_TYPE_CHANGED;
2954 /* from this point on, we are dealing with a pair
2955 * whose both sides are valid and of the same type, i.e.
2956 * either in-place edit or rename/copy edit.
2957 */
2958 else if (DIFF_PAIR_RENAME(p)) {
2959 /*
2960 * A rename might have re-connected a broken
2961 * pair up, causing the pathnames to be the
2962 * same again. If so, that's not a rename at
2963 * all, just a modification..
2964 *
2965 * Otherwise, see if this source was used for
2966 * multiple renames, in which case we decrement
2967 * the count, and call it a copy.
2968 */
2969 if (!strcmp(p->one->path, p->two->path))
2970 p->status = DIFF_STATUS_MODIFIED;
2971 else if (--p->one->rename_used > 0)
2972 p->status = DIFF_STATUS_COPIED;
2973 else
2974 p->status = DIFF_STATUS_RENAMED;
2975 }
2976 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2977 p->one->mode != p->two->mode ||
2978 is_null_sha1(p->one->sha1))
2979 p->status = DIFF_STATUS_MODIFIED;
2980 else {
2981 /* This is a "no-change" entry and should not
2982 * happen anymore, but prepare for broken callers.
2983 */
2984 error("feeding unmodified %s to diffcore",
2985 p->one->path);
2986 p->status = DIFF_STATUS_UNKNOWN;
2987 }
2988 }
2989 diff_debug_queue("resolve-rename-copy done", q);
2990 }
2992 static int check_pair_status(struct diff_filepair *p)
2993 {
2994 switch (p->status) {
2995 case DIFF_STATUS_UNKNOWN:
2996 return 0;
2997 case 0:
2998 die("internal error in diff-resolve-rename-copy");
2999 default:
3000 return 1;
3001 }
3002 }
3004 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3005 {
3006 int fmt = opt->output_format;
3008 if (fmt & DIFF_FORMAT_CHECKDIFF)
3009 diff_flush_checkdiff(p, opt);
3010 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3011 diff_flush_raw(p, opt);
3012 else if (fmt & DIFF_FORMAT_NAME) {
3013 const char *name_a, *name_b;
3014 name_a = p->two->path;
3015 name_b = NULL;
3016 strip_prefix(opt->prefix_length, &name_a, &name_b);
3017 write_name_quoted(name_a, opt->file, opt->line_termination);
3018 }
3019 }
3021 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3022 {
3023 if (fs->mode)
3024 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3025 else
3026 fprintf(file, " %s ", newdelete);
3027 write_name_quoted(fs->path, file, '\n');
3028 }
3031 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
3032 {
3033 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3034 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
3035 show_name ? ' ' : '\n');
3036 if (show_name) {
3037 write_name_quoted(p->two->path, file, '\n');
3038 }
3039 }
3040 }
3042 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
3043 {
3044 char *names = pprint_rename(p->one->path, p->two->path);
3046 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3047 free(names);
3048 show_mode_change(file, p, 0);
3049 }
3051 static void diff_summary(FILE *file, struct diff_filepair *p)
3052 {
3053 switch(p->status) {
3054 case DIFF_STATUS_DELETED:
3055 show_file_mode_name(file, "delete", p->one);
3056 break;
3057 case DIFF_STATUS_ADDED:
3058 show_file_mode_name(file, "create", p->two);
3059 break;
3060 case DIFF_STATUS_COPIED:
3061 show_rename_copy(file, "copy", p);
3062 break;
3063 case DIFF_STATUS_RENAMED:
3064 show_rename_copy(file, "rename", p);
3065 break;
3066 default:
3067 if (p->score) {
3068 fputs(" rewrite ", file);
3069 write_name_quoted(p->two->path, file, ' ');
3070 fprintf(file, "(%d%%)\n", similarity_index(p));
3071 }
3072 show_mode_change(file, p, !p->score);
3073 break;
3074 }
3075 }
3077 struct patch_id_t {
3078 SHA_CTX *ctx;
3079 int patchlen;
3080 };
3082 static int remove_space(char *line, int len)
3083 {
3084 int i;
3085 char *dst = line;
3086 unsigned char c;
3088 for (i = 0; i < len; i++)
3089 if (!isspace((c = line[i])))
3090 *dst++ = c;
3092 return dst - line;
3093 }
3095 static void patch_id_consume(void *priv, char *line, unsigned long len)
3096 {
3097 struct patch_id_t *data = priv;
3098 int new_len;
3100 /* Ignore line numbers when computing the SHA1 of the patch */
3101 if (!prefixcmp(line, "@@ -"))
3102 return;
3104 new_len = remove_space(line, len);
3106 SHA1_Update(data->ctx, line, new_len);
3107 data->patchlen += new_len;
3108 }
3110 /* returns 0 upon success, and writes result into sha1 */
3111 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3112 {
3113 struct diff_queue_struct *q = &diff_queued_diff;
3114 int i;
3115 SHA_CTX ctx;
3116 struct patch_id_t data;
3117 char buffer[PATH_MAX * 4 + 20];
3119 SHA1_Init(&ctx);
3120 memset(&data, 0, sizeof(struct patch_id_t));
3121 data.ctx = &ctx;
3123 for (i = 0; i < q->nr; i++) {
3124 xpparam_t xpp;
3125 xdemitconf_t xecfg;
3126 xdemitcb_t ecb;
3127 mmfile_t mf1, mf2;
3128 struct diff_filepair *p = q->queue[i];
3129 int len1, len2;
3131 memset(&xecfg, 0, sizeof(xecfg));
3132 if (p->status == 0)
3133 return error("internal diff status error");
3134 if (p->status == DIFF_STATUS_UNKNOWN)
3135 continue;
3136 if (diff_unmodified_pair(p))
3137 continue;
3138 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3139 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3140 continue;
3141 if (DIFF_PAIR_UNMERGED(p))
3142 continue;
3144 diff_fill_sha1_info(p->one);
3145 diff_fill_sha1_info(p->two);
3146 if (fill_mmfile(&mf1, p->one) < 0 ||
3147 fill_mmfile(&mf2, p->two) < 0)
3148 return error("unable to read files to diff");
3150 len1 = remove_space(p->one->path, strlen(p->one->path));
3151 len2 = remove_space(p->two->path, strlen(p->two->path));
3152 if (p->one->mode == 0)
3153 len1 = snprintf(buffer, sizeof(buffer),
3154 "diff--gita/%.*sb/%.*s"
3155 "newfilemode%06o"
3156 "---/dev/null"
3157 "+++b/%.*s",
3158 len1, p->one->path,
3159 len2, p->two->path,
3160 p->two->mode,
3161 len2, p->two->path);
3162 else if (p->two->mode == 0)
3163 len1 = snprintf(buffer, sizeof(buffer),
3164 "diff--gita/%.*sb/%.*s"
3165 "deletedfilemode%06o"
3166 "---a/%.*s"
3167 "+++/dev/null",
3168 len1, p->one->path,
3169 len2, p->two->path,
3170 p->one->mode,
3171 len1, p->one->path);
3172 else
3173 len1 = snprintf(buffer, sizeof(buffer),
3174 "diff--gita/%.*sb/%.*s"
3175 "---a/%.*s"
3176 "+++b/%.*s",
3177 len1, p->one->path,
3178 len2, p->two->path,
3179 len1, p->one->path,
3180 len2, p->two->path);
3181 SHA1_Update(&ctx, buffer, len1);
3183 xpp.flags = XDF_NEED_MINIMAL;
3184 xecfg.ctxlen = 3;
3185 xecfg.flags = XDL_EMIT_FUNCNAMES;
3186 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3187 &xpp, &xecfg, &ecb);
3188 }
3190 SHA1_Final(sha1, &ctx);
3191 return 0;
3192 }
3194 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3195 {
3196 struct diff_queue_struct *q = &diff_queued_diff;
3197 int i;
3198 int result = diff_get_patch_id(options, sha1);
3200 for (i = 0; i < q->nr; i++)
3201 diff_free_filepair(q->queue[i]);
3203 free(q->queue);
3204 q->queue = NULL;
3205 q->nr = q->alloc = 0;
3207 return result;
3208 }
3210 static int is_summary_empty(const struct diff_queue_struct *q)
3211 {
3212 int i;
3214 for (i = 0; i < q->nr; i++) {
3215 const struct diff_filepair *p = q->queue[i];
3217 switch (p->status) {
3218 case DIFF_STATUS_DELETED:
3219 case DIFF_STATUS_ADDED:
3220 case DIFF_STATUS_COPIED:
3221 case DIFF_STATUS_RENAMED:
3222 return 0;
3223 default:
3224 if (p->score)
3225 return 0;
3226 if (p->one->mode && p->two->mode &&
3227 p->one->mode != p->two->mode)
3228 return 0;
3229 break;
3230 }
3231 }
3232 return 1;
3233 }
3235 void diff_flush(struct diff_options *options)
3236 {
3237 struct diff_queue_struct *q = &diff_queued_diff;
3238 int i, output_format = options->output_format;
3239 int separator = 0;
3241 /*
3242 * Order: raw, stat, summary, patch
3243 * or: name/name-status/checkdiff (other bits clear)
3244 */
3245 if (!q->nr)
3246 goto free_queue;
3248 if (output_format & (DIFF_FORMAT_RAW |
3249 DIFF_FORMAT_NAME |
3250 DIFF_FORMAT_NAME_STATUS |
3251 DIFF_FORMAT_CHECKDIFF)) {
3252 for (i = 0; i < q->nr; i++) {
3253 struct diff_filepair *p = q->queue[i];
3254 if (check_pair_status(p))
3255 flush_one_pair(p, options);
3256 }
3257 separator++;
3258 }
3260 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3261 struct diffstat_t diffstat;
3263 memset(&diffstat, 0, sizeof(struct diffstat_t));
3264 for (i = 0; i < q->nr; i++) {
3265 struct diff_filepair *p = q->queue[i];
3266 if (check_pair_status(p))
3267 diff_flush_stat(p, options, &diffstat);
3268 }
3269 if (output_format & DIFF_FORMAT_NUMSTAT)
3270 show_numstat(&diffstat, options);
3271 if (output_format & DIFF_FORMAT_DIFFSTAT)
3272 show_stats(&diffstat, options);
3273 if (output_format & DIFF_FORMAT_SHORTSTAT)
3274 show_shortstats(&diffstat, options);
3275 free_diffstat_info(&diffstat);
3276 separator++;
3277 }
3278 if (output_format & DIFF_FORMAT_DIRSTAT)
3279 show_dirstat(options);
3281 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3282 for (i = 0; i < q->nr; i++)
3283 diff_summary(options->file, q->queue[i]);
3284 separator++;
3285 }
3287 if (output_format & DIFF_FORMAT_PATCH) {
3288 if (separator) {
3289 putc(options->line_termination, options->file);
3290 if (options->stat_sep) {
3291 /* attach patch instead of inline */
3292 fputs(options->stat_sep, options->file);
3293 }
3294 }
3296 for (i = 0; i < q->nr; i++) {
3297 struct diff_filepair *p = q->queue[i];
3298 if (check_pair_status(p))
3299 diff_flush_patch(p, options);
3300 }
3301 }
3303 if (output_format & DIFF_FORMAT_CALLBACK)
3304 options->format_callback(q, options, options->format_callback_data);
3306 for (i = 0; i < q->nr; i++)
3307 diff_free_filepair(q->queue[i]);
3308 free_queue:
3309 free(q->queue);
3310 q->queue = NULL;
3311 q->nr = q->alloc = 0;
3312 if (options->close_file)
3313 fclose(options->file);
3314 }
3316 static void diffcore_apply_filter(const char *filter)
3317 {
3318 int i;
3319 struct diff_queue_struct *q = &diff_queued_diff;
3320 struct diff_queue_struct outq;
3321 outq.queue = NULL;
3322 outq.nr = outq.alloc = 0;
3324 if (!filter)
3325 return;
3327 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3328 int found;
3329 for (i = found = 0; !found && i < q->nr; i++) {
3330 struct diff_filepair *p = q->queue[i];
3331 if (((p->status == DIFF_STATUS_MODIFIED) &&
3332 ((p->score &&
3333 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3334 (!p->score &&
3335 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3336 ((p->status != DIFF_STATUS_MODIFIED) &&
3337 strchr(filter, p->status)))
3338 found++;
3339 }
3340 if (found)
3341 return;
3343 /* otherwise we will clear the whole queue
3344 * by copying the empty outq at the end of this
3345 * function, but first clear the current entries
3346 * in the queue.
3347 */
3348 for (i = 0; i < q->nr; i++)
3349 diff_free_filepair(q->queue[i]);
3350 }
3351 else {
3352 /* Only the matching ones */
3353 for (i = 0; i < q->nr; i++) {
3354 struct diff_filepair *p = q->queue[i];
3356 if (((p->status == DIFF_STATUS_MODIFIED) &&
3357 ((p->score &&
3358 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3359 (!p->score &&
3360 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3361 ((p->status != DIFF_STATUS_MODIFIED) &&
3362 strchr(filter, p->status)))
3363 diff_q(&outq, p);
3364 else
3365 diff_free_filepair(p);
3366 }
3367 }
3368 free(q->queue);
3369 *q = outq;
3370 }
3372 /* Check whether two filespecs with the same mode and size are identical */
3373 static int diff_filespec_is_identical(struct diff_filespec *one,
3374 struct diff_filespec *two)
3375 {
3376 if (S_ISGITLINK(one->mode))
3377 return 0;
3378 if (diff_populate_filespec(one, 0))
3379 return 0;
3380 if (diff_populate_filespec(two, 0))
3381 return 0;
3382 return !memcmp(one->data, two->data, one->size);
3383 }
3385 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3386 {
3387 int i;
3388 struct diff_queue_struct *q = &diff_queued_diff;
3389 struct diff_queue_struct outq;
3390 outq.queue = NULL;
3391 outq.nr = outq.alloc = 0;
3393 for (i = 0; i < q->nr; i++) {
3394 struct diff_filepair *p = q->queue[i];
3396 /*
3397 * 1. Entries that come from stat info dirtyness
3398 * always have both sides (iow, not create/delete),
3399 * one side of the object name is unknown, with
3400 * the same mode and size. Keep the ones that
3401 * do not match these criteria. They have real
3402 * differences.
3403 *
3404 * 2. At this point, the file is known to be modified,
3405 * with the same mode and size, and the object
3406 * name of one side is unknown. Need to inspect
3407 * the identical contents.
3408 */
3409 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3410 !DIFF_FILE_VALID(p->two) ||
3411 (p->one->sha1_valid && p->two->sha1_valid) ||
3412 (p->one->mode != p->two->mode) ||
3413 diff_populate_filespec(p->one, 1) ||
3414 diff_populate_filespec(p->two, 1) ||
3415 (p->one->size != p->two->size) ||
3416 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
3417 diff_q(&outq, p);
3418 else {
3419 /*
3420 * The caller can subtract 1 from skip_stat_unmatch
3421 * to determine how many paths were dirty only
3422 * due to stat info mismatch.
3423 */
3424 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
3425 diffopt->skip_stat_unmatch++;
3426 diff_free_filepair(p);
3427 }
3428 }
3429 free(q->queue);
3430 *q = outq;
3431 }
3433 void diffcore_std(struct diff_options *options)
3434 {
3435 if (options->skip_stat_unmatch)
3436 diffcore_skip_stat_unmatch(options);
3437 if (options->break_opt != -1)
3438 diffcore_break(options->break_opt);
3439 if (options->detect_rename)
3440 diffcore_rename(options);
3441 if (options->break_opt != -1)
3442 diffcore_merge_broken();
3443 if (options->pickaxe)
3444 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3445 if (options->orderfile)
3446 diffcore_order(options->orderfile);
3447 diff_resolve_rename_copy();
3448 diffcore_apply_filter(options->filter);
3450 if (diff_queued_diff.nr)
3451 DIFF_OPT_SET(options, HAS_CHANGES);
3452 else
3453 DIFF_OPT_CLR(options, HAS_CHANGES);
3454 }
3456 int diff_result_code(struct diff_options *opt, int status)
3457 {
3458 int result = 0;
3459 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3460 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3461 return status;
3462 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3463 DIFF_OPT_TST(opt, HAS_CHANGES))
3464 result |= 01;
3465 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3466 DIFF_OPT_TST(opt, CHECK_FAILED))
3467 result |= 02;
3468 return result;
3469 }
3471 void diff_addremove(struct diff_options *options,
3472 int addremove, unsigned mode,
3473 const unsigned char *sha1,
3474 const char *concatpath)
3475 {
3476 struct diff_filespec *one, *two;
3478 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3479 return;
3481 /* This may look odd, but it is a preparation for
3482 * feeding "there are unchanged files which should
3483 * not produce diffs, but when you are doing copy
3484 * detection you would need them, so here they are"
3485 * entries to the diff-core. They will be prefixed
3486 * with something like '=' or '*' (I haven't decided
3487 * which but should not make any difference).
3488 * Feeding the same new and old to diff_change()
3489 * also has the same effect.
3490 * Before the final output happens, they are pruned after
3491 * merged into rename/copy pairs as appropriate.
3492 */
3493 if (DIFF_OPT_TST(options, REVERSE_DIFF))
3494 addremove = (addremove == '+' ? '-' :
3495 addremove == '-' ? '+' : addremove);
3497 if (options->prefix &&
3498 strncmp(concatpath, options->prefix, options->prefix_length))
3499 return;
3501 one = alloc_filespec(concatpath);
3502 two = alloc_filespec(concatpath);
3504 if (addremove != '+')
3505 fill_filespec(one, sha1, mode);
3506 if (addremove != '-')
3507 fill_filespec(two, sha1, mode);
3509 diff_queue(&diff_queued_diff, one, two);
3510 DIFF_OPT_SET(options, HAS_CHANGES);
3511 }
3513 void diff_change(struct diff_options *options,
3514 unsigned old_mode, unsigned new_mode,
3515 const unsigned char *old_sha1,
3516 const unsigned char *new_sha1,
3517 const char *concatpath)
3518 {
3519 struct diff_filespec *one, *two;
3521 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3522 && S_ISGITLINK(new_mode))
3523 return;
3525 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
3526 unsigned tmp;
3527 const unsigned char *tmp_c;
3528 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3529 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3530 }
3532 if (options->prefix &&
3533 strncmp(concatpath, options->prefix, options->prefix_length))
3534 return;
3536 one = alloc_filespec(concatpath);
3537 two = alloc_filespec(concatpath);
3538 fill_filespec(one, old_sha1, old_mode);
3539 fill_filespec(two, new_sha1, new_mode);
3541 diff_queue(&diff_queued_diff, one, two);
3542 DIFF_OPT_SET(options, HAS_CHANGES);
3543 }
3545 void diff_unmerge(struct diff_options *options,
3546 const char *path,
3547 unsigned mode, const unsigned char *sha1)
3548 {
3549 struct diff_filespec *one, *two;
3551 if (options->prefix &&
3552 strncmp(path, options->prefix, options->prefix_length))
3553 return;
3555 one = alloc_filespec(path);
3556 two = alloc_filespec(path);
3557 fill_filespec(one, sha1, mode);
3558 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3559 }