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GIT v1.5.2-rc3
[git/jrn.git] / diff.c
blob8354e71e0707960f7a1094e288bea0fac83ec6b8
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
13 #ifdef NO_FAST_WORKING_DIRECTORY
14 #define FAST_WORKING_DIRECTORY 0
15 #else
16 #define FAST_WORKING_DIRECTORY 1
17 #endif
18
19 static int diff_detect_rename_default;
20 static int diff_rename_limit_default = -1;
21 static int diff_use_color_default;
22
23 static char diff_colors[][COLOR_MAXLEN] = {
24 "\033[m", /* reset */
25 "", /* PLAIN (normal) */
26 "\033[1m", /* METAINFO (bold) */
27 "\033[36m", /* FRAGINFO (cyan) */
28 "\033[31m", /* OLD (red) */
29 "\033[32m", /* NEW (green) */
30 "\033[33m", /* COMMIT (yellow) */
31 "\033[41m", /* WHITESPACE (red background) */
32 };
33
34 static int parse_diff_color_slot(const char *var, int ofs)
35 {
36 if (!strcasecmp(var+ofs, "plain"))
37 return DIFF_PLAIN;
38 if (!strcasecmp(var+ofs, "meta"))
39 return DIFF_METAINFO;
40 if (!strcasecmp(var+ofs, "frag"))
41 return DIFF_FRAGINFO;
42 if (!strcasecmp(var+ofs, "old"))
43 return DIFF_FILE_OLD;
44 if (!strcasecmp(var+ofs, "new"))
45 return DIFF_FILE_NEW;
46 if (!strcasecmp(var+ofs, "commit"))
47 return DIFF_COMMIT;
48 if (!strcasecmp(var+ofs, "whitespace"))
49 return DIFF_WHITESPACE;
50 die("bad config variable '%s'", var);
51 }
52
53 static struct ll_diff_driver {
54 const char *name;
55 struct ll_diff_driver *next;
56 char *cmd;
57 } *user_diff, **user_diff_tail;
58
59 /*
60 * Currently there is only "diff.<drivername>.command" variable;
61 * because there are "diff.color.<slot>" variables, we are parsing
62 * this in a bit convoluted way to allow low level diff driver
63 * called "color".
64 */
65 static int parse_lldiff_command(const char *var, const char *ep, const char *value)
66 {
67 const char *name;
68 int namelen;
69 struct ll_diff_driver *drv;
70
71 name = var + 5;
72 namelen = ep - name;
73 for (drv = user_diff; drv; drv = drv->next)
74 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
75 break;
76 if (!drv) {
77 char *namebuf;
78 drv = xcalloc(1, sizeof(struct ll_diff_driver));
79 namebuf = xmalloc(namelen + 1);
80 memcpy(namebuf, name, namelen);
81 namebuf[namelen] = 0;
82 drv->name = namebuf;
83 drv->next = NULL;
84 if (!user_diff_tail)
85 user_diff_tail = &user_diff;
86 *user_diff_tail = drv;
87 user_diff_tail = &(drv->next);
88 }
89
90 if (!value)
91 return error("%s: lacks value", var);
92 drv->cmd = strdup(value);
93 return 0;
94 }
95
96 /*
97 * These are to give UI layer defaults.
98 * The core-level commands such as git-diff-files should
99 * never be affected by the setting of diff.renames
100 * the user happens to have in the configuration file.
101 */
102 int git_diff_ui_config(const char *var, const char *value)
103 {
104 if (!strcmp(var, "diff.renamelimit")) {
105 diff_rename_limit_default = git_config_int(var, value);
106 return 0;
107 }
108 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
109 diff_use_color_default = git_config_colorbool(var, value);
110 return 0;
111 }
112 if (!strcmp(var, "diff.renames")) {
113 if (!value)
114 diff_detect_rename_default = DIFF_DETECT_RENAME;
115 else if (!strcasecmp(value, "copies") ||
116 !strcasecmp(value, "copy"))
117 diff_detect_rename_default = DIFF_DETECT_COPY;
118 else if (git_config_bool(var,value))
119 diff_detect_rename_default = DIFF_DETECT_RENAME;
120 return 0;
121 }
122 if (!prefixcmp(var, "diff.")) {
123 const char *ep = strrchr(var, '.');
124
125 if (ep != var + 4 && !strcmp(ep, ".command"))
126 return parse_lldiff_command(var, ep, value);
127 }
128 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
129 int slot = parse_diff_color_slot(var, 11);
130 color_parse(value, var, diff_colors[slot]);
131 return 0;
132 }
133
134 return git_default_config(var, value);
135 }
136
137 static char *quote_one(const char *str)
138 {
139 int needlen;
140 char *xp;
141
142 if (!str)
143 return NULL;
144 needlen = quote_c_style(str, NULL, NULL, 0);
145 if (!needlen)
146 return xstrdup(str);
147 xp = xmalloc(needlen + 1);
148 quote_c_style(str, xp, NULL, 0);
149 return xp;
150 }
151
152 static char *quote_two(const char *one, const char *two)
153 {
154 int need_one = quote_c_style(one, NULL, NULL, 1);
155 int need_two = quote_c_style(two, NULL, NULL, 1);
156 char *xp;
157
158 if (need_one + need_two) {
159 if (!need_one) need_one = strlen(one);
160 if (!need_two) need_one = strlen(two);
161
162 xp = xmalloc(need_one + need_two + 3);
163 xp[0] = '"';
164 quote_c_style(one, xp + 1, NULL, 1);
165 quote_c_style(two, xp + need_one + 1, NULL, 1);
166 strcpy(xp + need_one + need_two + 1, "\"");
167 return xp;
168 }
169 need_one = strlen(one);
170 need_two = strlen(two);
171 xp = xmalloc(need_one + need_two + 1);
172 strcpy(xp, one);
173 strcpy(xp + need_one, two);
174 return xp;
175 }
176
177 static const char *external_diff(void)
178 {
179 static const char *external_diff_cmd = NULL;
180 static int done_preparing = 0;
181
182 if (done_preparing)
183 return external_diff_cmd;
184 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
185 done_preparing = 1;
186 return external_diff_cmd;
187 }
188
189 #define TEMPFILE_PATH_LEN 50
190
191 static struct diff_tempfile {
192 const char *name; /* filename external diff should read from */
193 char hex[41];
194 char mode[10];
195 char tmp_path[TEMPFILE_PATH_LEN];
196 } diff_temp[2];
197
198 static int count_lines(const char *data, int size)
199 {
200 int count, ch, completely_empty = 1, nl_just_seen = 0;
201 count = 0;
202 while (0 < size--) {
203 ch = *data++;
204 if (ch == '\n') {
205 count++;
206 nl_just_seen = 1;
207 completely_empty = 0;
208 }
209 else {
210 nl_just_seen = 0;
211 completely_empty = 0;
212 }
213 }
214 if (completely_empty)
215 return 0;
216 if (!nl_just_seen)
217 count++; /* no trailing newline */
218 return count;
219 }
220
221 static void print_line_count(int count)
222 {
223 switch (count) {
224 case 0:
225 printf("0,0");
226 break;
227 case 1:
228 printf("1");
229 break;
230 default:
231 printf("1,%d", count);
232 break;
233 }
234 }
235
236 static void copy_file(int prefix, const char *data, int size,
237 const char *set, const char *reset)
238 {
239 int ch, nl_just_seen = 1;
240 while (0 < size--) {
241 ch = *data++;
242 if (nl_just_seen) {
243 fputs(set, stdout);
244 putchar(prefix);
245 }
246 if (ch == '\n') {
247 nl_just_seen = 1;
248 fputs(reset, stdout);
249 } else
250 nl_just_seen = 0;
251 putchar(ch);
252 }
253 if (!nl_just_seen)
254 printf("%s\n\\ No newline at end of file\n", reset);
255 }
256
257 static void emit_rewrite_diff(const char *name_a,
258 const char *name_b,
259 struct diff_filespec *one,
260 struct diff_filespec *two,
261 int color_diff)
262 {
263 int lc_a, lc_b;
264 const char *name_a_tab, *name_b_tab;
265 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
266 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
267 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
268 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
269 const char *reset = diff_get_color(color_diff, DIFF_RESET);
270
271 name_a += (*name_a == '/');
272 name_b += (*name_b == '/');
273 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
274 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
275
276 diff_populate_filespec(one, 0);
277 diff_populate_filespec(two, 0);
278 lc_a = count_lines(one->data, one->size);
279 lc_b = count_lines(two->data, two->size);
280 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
281 metainfo, name_a, name_a_tab, reset,
282 metainfo, name_b, name_b_tab, reset, fraginfo);
283 print_line_count(lc_a);
284 printf(" +");
285 print_line_count(lc_b);
286 printf(" @@%s\n", reset);
287 if (lc_a)
288 copy_file('-', one->data, one->size, old, reset);
289 if (lc_b)
290 copy_file('+', two->data, two->size, new, reset);
291 }
292
293 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
294 {
295 if (!DIFF_FILE_VALID(one)) {
296 mf->ptr = (char *)""; /* does not matter */
297 mf->size = 0;
298 return 0;
299 }
300 else if (diff_populate_filespec(one, 0))
301 return -1;
302 mf->ptr = one->data;
303 mf->size = one->size;
304 return 0;
305 }
306
307 struct diff_words_buffer {
308 mmfile_t text;
309 long alloc;
310 long current; /* output pointer */
311 int suppressed_newline;
312 };
313
314 static void diff_words_append(char *line, unsigned long len,
315 struct diff_words_buffer *buffer)
316 {
317 if (buffer->text.size + len > buffer->alloc) {
318 buffer->alloc = (buffer->text.size + len) * 3 / 2;
319 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
320 }
321 line++;
322 len--;
323 memcpy(buffer->text.ptr + buffer->text.size, line, len);
324 buffer->text.size += len;
325 }
326
327 struct diff_words_data {
328 struct xdiff_emit_state xm;
329 struct diff_words_buffer minus, plus;
330 };
331
332 static void print_word(struct diff_words_buffer *buffer, int len, int color,
333 int suppress_newline)
334 {
335 const char *ptr;
336 int eol = 0;
337
338 if (len == 0)
339 return;
340
341 ptr = buffer->text.ptr + buffer->current;
342 buffer->current += len;
343
344 if (ptr[len - 1] == '\n') {
345 eol = 1;
346 len--;
347 }
348
349 fputs(diff_get_color(1, color), stdout);
350 fwrite(ptr, len, 1, stdout);
351 fputs(diff_get_color(1, DIFF_RESET), stdout);
352
353 if (eol) {
354 if (suppress_newline)
355 buffer->suppressed_newline = 1;
356 else
357 putchar('\n');
358 }
359 }
360
361 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
362 {
363 struct diff_words_data *diff_words = priv;
364
365 if (diff_words->minus.suppressed_newline) {
366 if (line[0] != '+')
367 putchar('\n');
368 diff_words->minus.suppressed_newline = 0;
369 }
370
371 len--;
372 switch (line[0]) {
373 case '-':
374 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
375 break;
376 case '+':
377 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
378 break;
379 case ' ':
380 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
381 diff_words->minus.current += len;
382 break;
383 }
384 }
385
386 /* this executes the word diff on the accumulated buffers */
387 static void diff_words_show(struct diff_words_data *diff_words)
388 {
389 xpparam_t xpp;
390 xdemitconf_t xecfg;
391 xdemitcb_t ecb;
392 mmfile_t minus, plus;
393 int i;
394
395 minus.size = diff_words->minus.text.size;
396 minus.ptr = xmalloc(minus.size);
397 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
398 for (i = 0; i < minus.size; i++)
399 if (isspace(minus.ptr[i]))
400 minus.ptr[i] = '\n';
401 diff_words->minus.current = 0;
402
403 plus.size = diff_words->plus.text.size;
404 plus.ptr = xmalloc(plus.size);
405 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
406 for (i = 0; i < plus.size; i++)
407 if (isspace(plus.ptr[i]))
408 plus.ptr[i] = '\n';
409 diff_words->plus.current = 0;
410
411 xpp.flags = XDF_NEED_MINIMAL;
412 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
413 xecfg.flags = 0;
414 ecb.outf = xdiff_outf;
415 ecb.priv = diff_words;
416 diff_words->xm.consume = fn_out_diff_words_aux;
417 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
418
419 free(minus.ptr);
420 free(plus.ptr);
421 diff_words->minus.text.size = diff_words->plus.text.size = 0;
422
423 if (diff_words->minus.suppressed_newline) {
424 putchar('\n');
425 diff_words->minus.suppressed_newline = 0;
426 }
427 }
428
429 struct emit_callback {
430 struct xdiff_emit_state xm;
431 int nparents, color_diff;
432 const char **label_path;
433 struct diff_words_data *diff_words;
434 int *found_changesp;
435 };
436
437 static void free_diff_words_data(struct emit_callback *ecbdata)
438 {
439 if (ecbdata->diff_words) {
440 /* flush buffers */
441 if (ecbdata->diff_words->minus.text.size ||
442 ecbdata->diff_words->plus.text.size)
443 diff_words_show(ecbdata->diff_words);
444
445 if (ecbdata->diff_words->minus.text.ptr)
446 free (ecbdata->diff_words->minus.text.ptr);
447 if (ecbdata->diff_words->plus.text.ptr)
448 free (ecbdata->diff_words->plus.text.ptr);
449 free(ecbdata->diff_words);
450 ecbdata->diff_words = NULL;
451 }
452 }
453
454 const char *diff_get_color(int diff_use_color, enum color_diff ix)
455 {
456 if (diff_use_color)
457 return diff_colors[ix];
458 return "";
459 }
460
461 static void emit_line(const char *set, const char *reset, const char *line, int len)
462 {
463 if (len > 0 && line[len-1] == '\n')
464 len--;
465 fputs(set, stdout);
466 fwrite(line, len, 1, stdout);
467 puts(reset);
468 }
469
470 static void emit_line_with_ws(int nparents,
471 const char *set, const char *reset, const char *ws,
472 const char *line, int len)
473 {
474 int col0 = nparents;
475 int last_tab_in_indent = -1;
476 int last_space_in_indent = -1;
477 int i;
478 int tail = len;
479 int need_highlight_leading_space = 0;
480 /* The line is a newly added line. Does it have funny leading
481 * whitespaces? In indent, SP should never precede a TAB.
482 */
483 for (i = col0; i < len; i++) {
484 if (line[i] == '\t') {
485 last_tab_in_indent = i;
486 if (0 <= last_space_in_indent)
487 need_highlight_leading_space = 1;
488 }
489 else if (line[i] == ' ')
490 last_space_in_indent = i;
491 else
492 break;
493 }
494 fputs(set, stdout);
495 fwrite(line, col0, 1, stdout);
496 fputs(reset, stdout);
497 if (((i == len) || line[i] == '\n') && i != col0) {
498 /* The whole line was indent */
499 emit_line(ws, reset, line + col0, len - col0);
500 return;
501 }
502 i = col0;
503 if (need_highlight_leading_space) {
504 while (i < last_tab_in_indent) {
505 if (line[i] == ' ') {
506 fputs(ws, stdout);
507 putchar(' ');
508 fputs(reset, stdout);
509 }
510 else
511 putchar(line[i]);
512 i++;
513 }
514 }
515 tail = len - 1;
516 if (line[tail] == '\n' && i < tail)
517 tail--;
518 while (i < tail) {
519 if (!isspace(line[tail]))
520 break;
521 tail--;
522 }
523 if ((i < tail && line[tail + 1] != '\n')) {
524 /* This has whitespace between tail+1..len */
525 fputs(set, stdout);
526 fwrite(line + i, tail - i + 1, 1, stdout);
527 fputs(reset, stdout);
528 emit_line(ws, reset, line + tail + 1, len - tail - 1);
529 }
530 else
531 emit_line(set, reset, line + i, len - i);
532 }
533
534 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
535 {
536 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
537 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
538
539 if (!*ws)
540 emit_line(set, reset, line, len);
541 else
542 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
543 line, len);
544 }
545
546 static void fn_out_consume(void *priv, char *line, unsigned long len)
547 {
548 int i;
549 int color;
550 struct emit_callback *ecbdata = priv;
551 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
552 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
553
554 *(ecbdata->found_changesp) = 1;
555
556 if (ecbdata->label_path[0]) {
557 const char *name_a_tab, *name_b_tab;
558
559 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
560 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
561
562 printf("%s--- %s%s%s\n",
563 set, ecbdata->label_path[0], reset, name_a_tab);
564 printf("%s+++ %s%s%s\n",
565 set, ecbdata->label_path[1], reset, name_b_tab);
566 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
567 }
568
569 /* This is not really necessary for now because
570 * this codepath only deals with two-way diffs.
571 */
572 for (i = 0; i < len && line[i] == '@'; i++)
573 ;
574 if (2 <= i && i < len && line[i] == ' ') {
575 ecbdata->nparents = i - 1;
576 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
577 reset, line, len);
578 return;
579 }
580
581 if (len < ecbdata->nparents) {
582 set = reset;
583 emit_line(reset, reset, line, len);
584 return;
585 }
586
587 color = DIFF_PLAIN;
588 if (ecbdata->diff_words && ecbdata->nparents != 1)
589 /* fall back to normal diff */
590 free_diff_words_data(ecbdata);
591 if (ecbdata->diff_words) {
592 if (line[0] == '-') {
593 diff_words_append(line, len,
594 &ecbdata->diff_words->minus);
595 return;
596 } else if (line[0] == '+') {
597 diff_words_append(line, len,
598 &ecbdata->diff_words->plus);
599 return;
600 }
601 if (ecbdata->diff_words->minus.text.size ||
602 ecbdata->diff_words->plus.text.size)
603 diff_words_show(ecbdata->diff_words);
604 line++;
605 len--;
606 emit_line(set, reset, line, len);
607 return;
608 }
609 for (i = 0; i < ecbdata->nparents && len; i++) {
610 if (line[i] == '-')
611 color = DIFF_FILE_OLD;
612 else if (line[i] == '+')
613 color = DIFF_FILE_NEW;
614 }
615
616 if (color != DIFF_FILE_NEW) {
617 emit_line(diff_get_color(ecbdata->color_diff, color),
618 reset, line, len);
619 return;
620 }
621 emit_add_line(reset, ecbdata, line, len);
622 }
623
624 static char *pprint_rename(const char *a, const char *b)
625 {
626 const char *old = a;
627 const char *new = b;
628 char *name = NULL;
629 int pfx_length, sfx_length;
630 int len_a = strlen(a);
631 int len_b = strlen(b);
632 int qlen_a = quote_c_style(a, NULL, NULL, 0);
633 int qlen_b = quote_c_style(b, NULL, NULL, 0);
634
635 if (qlen_a || qlen_b) {
636 if (qlen_a) len_a = qlen_a;
637 if (qlen_b) len_b = qlen_b;
638 name = xmalloc( len_a + len_b + 5 );
639 if (qlen_a)
640 quote_c_style(a, name, NULL, 0);
641 else
642 memcpy(name, a, len_a);
643 memcpy(name + len_a, " => ", 4);
644 if (qlen_b)
645 quote_c_style(b, name + len_a + 4, NULL, 0);
646 else
647 memcpy(name + len_a + 4, b, len_b + 1);
648 return name;
649 }
650
651 /* Find common prefix */
652 pfx_length = 0;
653 while (*old && *new && *old == *new) {
654 if (*old == '/')
655 pfx_length = old - a + 1;
656 old++;
657 new++;
658 }
659
660 /* Find common suffix */
661 old = a + len_a;
662 new = b + len_b;
663 sfx_length = 0;
664 while (a <= old && b <= new && *old == *new) {
665 if (*old == '/')
666 sfx_length = len_a - (old - a);
667 old--;
668 new--;
669 }
670
671 /*
672 * pfx{mid-a => mid-b}sfx
673 * {pfx-a => pfx-b}sfx
674 * pfx{sfx-a => sfx-b}
675 * name-a => name-b
676 */
677 if (pfx_length + sfx_length) {
678 int a_midlen = len_a - pfx_length - sfx_length;
679 int b_midlen = len_b - pfx_length - sfx_length;
680 if (a_midlen < 0) a_midlen = 0;
681 if (b_midlen < 0) b_midlen = 0;
682
683 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
684 sprintf(name, "%.*s{%.*s => %.*s}%s",
685 pfx_length, a,
686 a_midlen, a + pfx_length,
687 b_midlen, b + pfx_length,
688 a + len_a - sfx_length);
689 }
690 else {
691 name = xmalloc(len_a + len_b + 5);
692 sprintf(name, "%s => %s", a, b);
693 }
694 return name;
695 }
696
697 struct diffstat_t {
698 struct xdiff_emit_state xm;
699
700 int nr;
701 int alloc;
702 struct diffstat_file {
703 char *name;
704 unsigned is_unmerged:1;
705 unsigned is_binary:1;
706 unsigned is_renamed:1;
707 unsigned int added, deleted;
708 } **files;
709 };
710
711 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
712 const char *name_a,
713 const char *name_b)
714 {
715 struct diffstat_file *x;
716 x = xcalloc(sizeof (*x), 1);
717 if (diffstat->nr == diffstat->alloc) {
718 diffstat->alloc = alloc_nr(diffstat->alloc);
719 diffstat->files = xrealloc(diffstat->files,
720 diffstat->alloc * sizeof(x));
721 }
722 diffstat->files[diffstat->nr++] = x;
723 if (name_b) {
724 x->name = pprint_rename(name_a, name_b);
725 x->is_renamed = 1;
726 }
727 else
728 x->name = xstrdup(name_a);
729 return x;
730 }
731
732 static void diffstat_consume(void *priv, char *line, unsigned long len)
733 {
734 struct diffstat_t *diffstat = priv;
735 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
736
737 if (line[0] == '+')
738 x->added++;
739 else if (line[0] == '-')
740 x->deleted++;
741 }
742
743 const char mime_boundary_leader[] = "------------";
744
745 static int scale_linear(int it, int width, int max_change)
746 {
747 /*
748 * make sure that at least one '-' is printed if there were deletions,
749 * and likewise for '+'.
750 */
751 if (max_change < 2)
752 return it;
753 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
754 }
755
756 static void show_name(const char *prefix, const char *name, int len,
757 const char *reset, const char *set)
758 {
759 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
760 }
761
762 static void show_graph(char ch, int cnt, const char *set, const char *reset)
763 {
764 if (cnt <= 0)
765 return;
766 printf("%s", set);
767 while (cnt--)
768 putchar(ch);
769 printf("%s", reset);
770 }
771
772 static void show_stats(struct diffstat_t* data, struct diff_options *options)
773 {
774 int i, len, add, del, total, adds = 0, dels = 0;
775 int max_change = 0, max_len = 0;
776 int total_files = data->nr;
777 int width, name_width;
778 const char *reset, *set, *add_c, *del_c;
779
780 if (data->nr == 0)
781 return;
782
783 width = options->stat_width ? options->stat_width : 80;
784 name_width = options->stat_name_width ? options->stat_name_width : 50;
785
786 /* Sanity: give at least 5 columns to the graph,
787 * but leave at least 10 columns for the name.
788 */
789 if (width < name_width + 15) {
790 if (name_width <= 25)
791 width = name_width + 15;
792 else
793 name_width = width - 15;
794 }
795
796 /* Find the longest filename and max number of changes */
797 reset = diff_get_color(options->color_diff, DIFF_RESET);
798 set = diff_get_color(options->color_diff, DIFF_PLAIN);
799 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
800 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
801
802 for (i = 0; i < data->nr; i++) {
803 struct diffstat_file *file = data->files[i];
804 int change = file->added + file->deleted;
805
806 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
807 len = quote_c_style(file->name, NULL, NULL, 0);
808 if (len) {
809 char *qname = xmalloc(len + 1);
810 quote_c_style(file->name, qname, NULL, 0);
811 free(file->name);
812 file->name = qname;
813 }
814 }
815
816 len = strlen(file->name);
817 if (max_len < len)
818 max_len = len;
819
820 if (file->is_binary || file->is_unmerged)
821 continue;
822 if (max_change < change)
823 max_change = change;
824 }
825
826 /* Compute the width of the graph part;
827 * 10 is for one blank at the beginning of the line plus
828 * " | count " between the name and the graph.
829 *
830 * From here on, name_width is the width of the name area,
831 * and width is the width of the graph area.
832 */
833 name_width = (name_width < max_len) ? name_width : max_len;
834 if (width < (name_width + 10) + max_change)
835 width = width - (name_width + 10);
836 else
837 width = max_change;
838
839 for (i = 0; i < data->nr; i++) {
840 const char *prefix = "";
841 char *name = data->files[i]->name;
842 int added = data->files[i]->added;
843 int deleted = data->files[i]->deleted;
844 int name_len;
845
846 /*
847 * "scale" the filename
848 */
849 len = name_width;
850 name_len = strlen(name);
851 if (name_width < name_len) {
852 char *slash;
853 prefix = "...";
854 len -= 3;
855 name += name_len - len;
856 slash = strchr(name, '/');
857 if (slash)
858 name = slash;
859 }
860
861 if (data->files[i]->is_binary) {
862 show_name(prefix, name, len, reset, set);
863 printf(" Bin ");
864 printf("%s%d%s", del_c, deleted, reset);
865 printf(" -> ");
866 printf("%s%d%s", add_c, added, reset);
867 printf(" bytes");
868 printf("\n");
869 goto free_diffstat_file;
870 }
871 else if (data->files[i]->is_unmerged) {
872 show_name(prefix, name, len, reset, set);
873 printf(" Unmerged\n");
874 goto free_diffstat_file;
875 }
876 else if (!data->files[i]->is_renamed &&
877 (added + deleted == 0)) {
878 total_files--;
879 goto free_diffstat_file;
880 }
881
882 /*
883 * scale the add/delete
884 */
885 add = added;
886 del = deleted;
887 total = add + del;
888 adds += add;
889 dels += del;
890
891 if (width <= max_change) {
892 add = scale_linear(add, width, max_change);
893 del = scale_linear(del, width, max_change);
894 total = add + del;
895 }
896 show_name(prefix, name, len, reset, set);
897 printf("%5d ", added + deleted);
898 show_graph('+', add, add_c, reset);
899 show_graph('-', del, del_c, reset);
900 putchar('\n');
901 free_diffstat_file:
902 free(data->files[i]->name);
903 free(data->files[i]);
904 }
905 free(data->files);
906 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
907 set, total_files, adds, dels, reset);
908 }
909
910 static void show_shortstats(struct diffstat_t* data)
911 {
912 int i, adds = 0, dels = 0, total_files = data->nr;
913
914 if (data->nr == 0)
915 return;
916
917 for (i = 0; i < data->nr; i++) {
918 if (!data->files[i]->is_binary &&
919 !data->files[i]->is_unmerged) {
920 int added = data->files[i]->added;
921 int deleted= data->files[i]->deleted;
922 if (!data->files[i]->is_renamed &&
923 (added + deleted == 0)) {
924 total_files--;
925 } else {
926 adds += added;
927 dels += deleted;
928 }
929 }
930 free(data->files[i]->name);
931 free(data->files[i]);
932 }
933 free(data->files);
934
935 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
936 total_files, adds, dels);
937 }
938
939 static void show_numstat(struct diffstat_t* data, struct diff_options *options)
940 {
941 int i;
942
943 for (i = 0; i < data->nr; i++) {
944 struct diffstat_file *file = data->files[i];
945
946 if (file->is_binary)
947 printf("-\t-\t");
948 else
949 printf("%d\t%d\t", file->added, file->deleted);
950 if (options->line_termination && !file->is_renamed &&
951 quote_c_style(file->name, NULL, NULL, 0))
952 quote_c_style(file->name, NULL, stdout, 0);
953 else
954 fputs(file->name, stdout);
955 putchar(options->line_termination);
956 }
957 }
958
959 struct checkdiff_t {
960 struct xdiff_emit_state xm;
961 const char *filename;
962 int lineno, color_diff;
963 };
964
965 static void checkdiff_consume(void *priv, char *line, unsigned long len)
966 {
967 struct checkdiff_t *data = priv;
968 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
969 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
970 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
971
972 if (line[0] == '+') {
973 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
974
975 /* check space before tab */
976 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
977 if (line[i] == ' ')
978 spaces++;
979 if (line[i - 1] == '\t' && spaces)
980 space_before_tab = 1;
981
982 /* check white space at line end */
983 if (line[len - 1] == '\n')
984 len--;
985 if (isspace(line[len - 1]))
986 white_space_at_end = 1;
987
988 if (space_before_tab || white_space_at_end) {
989 printf("%s:%d: %s", data->filename, data->lineno, ws);
990 if (space_before_tab) {
991 printf("space before tab");
992 if (white_space_at_end)
993 putchar(',');
994 }
995 if (white_space_at_end)
996 printf("white space at end");
997 printf(":%s ", reset);
998 emit_line_with_ws(1, set, reset, ws, line, len);
999 }
1000
1001 data->lineno++;
1002 } else if (line[0] == ' ')
1003 data->lineno++;
1004 else if (line[0] == '@') {
1005 char *plus = strchr(line, '+');
1006 if (plus)
1007 data->lineno = strtol(plus, NULL, 10);
1008 else
1009 die("invalid diff");
1010 }
1011 }
1012
1013 static unsigned char *deflate_it(char *data,
1014 unsigned long size,
1015 unsigned long *result_size)
1016 {
1017 int bound;
1018 unsigned char *deflated;
1019 z_stream stream;
1020
1021 memset(&stream, 0, sizeof(stream));
1022 deflateInit(&stream, zlib_compression_level);
1023 bound = deflateBound(&stream, size);
1024 deflated = xmalloc(bound);
1025 stream.next_out = deflated;
1026 stream.avail_out = bound;
1027
1028 stream.next_in = (unsigned char *)data;
1029 stream.avail_in = size;
1030 while (deflate(&stream, Z_FINISH) == Z_OK)
1031 ; /* nothing */
1032 deflateEnd(&stream);
1033 *result_size = stream.total_out;
1034 return deflated;
1035 }
1036
1037 static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
1038 {
1039 void *cp;
1040 void *delta;
1041 void *deflated;
1042 void *data;
1043 unsigned long orig_size;
1044 unsigned long delta_size;
1045 unsigned long deflate_size;
1046 unsigned long data_size;
1047
1048 /* We could do deflated delta, or we could do just deflated two,
1049 * whichever is smaller.
1050 */
1051 delta = NULL;
1052 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1053 if (one->size && two->size) {
1054 delta = diff_delta(one->ptr, one->size,
1055 two->ptr, two->size,
1056 &delta_size, deflate_size);
1057 if (delta) {
1058 void *to_free = delta;
1059 orig_size = delta_size;
1060 delta = deflate_it(delta, delta_size, &delta_size);
1061 free(to_free);
1062 }
1063 }
1064
1065 if (delta && delta_size < deflate_size) {
1066 printf("delta %lu\n", orig_size);
1067 free(deflated);
1068 data = delta;
1069 data_size = delta_size;
1070 }
1071 else {
1072 printf("literal %lu\n", two->size);
1073 free(delta);
1074 data = deflated;
1075 data_size = deflate_size;
1076 }
1077
1078 /* emit data encoded in base85 */
1079 cp = data;
1080 while (data_size) {
1081 int bytes = (52 < data_size) ? 52 : data_size;
1082 char line[70];
1083 data_size -= bytes;
1084 if (bytes <= 26)
1085 line[0] = bytes + 'A' - 1;
1086 else
1087 line[0] = bytes - 26 + 'a' - 1;
1088 encode_85(line + 1, cp, bytes);
1089 cp = (char *) cp + bytes;
1090 puts(line);
1091 }
1092 printf("\n");
1093 free(data);
1094 }
1095
1096 static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1097 {
1098 printf("GIT binary patch\n");
1099 emit_binary_diff_body(one, two);
1100 emit_binary_diff_body(two, one);
1101 }
1102
1103 static void setup_diff_attr_check(struct git_attr_check *check)
1104 {
1105 static struct git_attr *attr_diff;
1106
1107 if (!attr_diff)
1108 attr_diff = git_attr("diff", 4);
1109 check->attr = attr_diff;
1110 }
1111
1112 #define FIRST_FEW_BYTES 8000
1113 static int file_is_binary(struct diff_filespec *one)
1114 {
1115 unsigned long sz;
1116 struct git_attr_check attr_diff_check;
1117
1118 setup_diff_attr_check(&attr_diff_check);
1119 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
1120 const char *value = attr_diff_check.value;
1121 if (ATTR_TRUE(value))
1122 return 0;
1123 else if (ATTR_FALSE(value))
1124 return 1;
1125 }
1126
1127 if (!one->data) {
1128 if (!DIFF_FILE_VALID(one))
1129 return 0;
1130 diff_populate_filespec(one, 0);
1131 }
1132 sz = one->size;
1133 if (FIRST_FEW_BYTES < sz)
1134 sz = FIRST_FEW_BYTES;
1135 return !!memchr(one->data, 0, sz);
1136 }
1137
1138 static void builtin_diff(const char *name_a,
1139 const char *name_b,
1140 struct diff_filespec *one,
1141 struct diff_filespec *two,
1142 const char *xfrm_msg,
1143 struct diff_options *o,
1144 int complete_rewrite)
1145 {
1146 mmfile_t mf1, mf2;
1147 const char *lbl[2];
1148 char *a_one, *b_two;
1149 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1150 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
1151
1152 a_one = quote_two("a/", name_a + (*name_a == '/'));
1153 b_two = quote_two("b/", name_b + (*name_b == '/'));
1154 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1155 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1156 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
1157 if (lbl[0][0] == '/') {
1158 /* /dev/null */
1159 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1160 if (xfrm_msg && xfrm_msg[0])
1161 printf("%s%s%s\n", set, xfrm_msg, reset);
1162 }
1163 else if (lbl[1][0] == '/') {
1164 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1165 if (xfrm_msg && xfrm_msg[0])
1166 printf("%s%s%s\n", set, xfrm_msg, reset);
1167 }
1168 else {
1169 if (one->mode != two->mode) {
1170 printf("%sold mode %06o%s\n", set, one->mode, reset);
1171 printf("%snew mode %06o%s\n", set, two->mode, reset);
1172 }
1173 if (xfrm_msg && xfrm_msg[0])
1174 printf("%s%s%s\n", set, xfrm_msg, reset);
1175 /*
1176 * we do not run diff between different kind
1177 * of objects.
1178 */
1179 if ((one->mode ^ two->mode) & S_IFMT)
1180 goto free_ab_and_return;
1181 if (complete_rewrite) {
1182 emit_rewrite_diff(name_a, name_b, one, two,
1183 o->color_diff);
1184 o->found_changes = 1;
1185 goto free_ab_and_return;
1186 }
1187 }
1188
1189 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1190 die("unable to read files to diff");
1191
1192 if (!o->text && (file_is_binary(one) || file_is_binary(two))) {
1193 /* Quite common confusing case */
1194 if (mf1.size == mf2.size &&
1195 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1196 goto free_ab_and_return;
1197 if (o->binary)
1198 emit_binary_diff(&mf1, &mf2);
1199 else
1200 printf("Binary files %s and %s differ\n",
1201 lbl[0], lbl[1]);
1202 o->found_changes = 1;
1203 }
1204 else {
1205 /* Crazy xdl interfaces.. */
1206 const char *diffopts = getenv("GIT_DIFF_OPTS");
1207 xpparam_t xpp;
1208 xdemitconf_t xecfg;
1209 xdemitcb_t ecb;
1210 struct emit_callback ecbdata;
1211
1212 memset(&ecbdata, 0, sizeof(ecbdata));
1213 ecbdata.label_path = lbl;
1214 ecbdata.color_diff = o->color_diff;
1215 ecbdata.found_changesp = &o->found_changes;
1216 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1217 xecfg.ctxlen = o->context;
1218 xecfg.flags = XDL_EMIT_FUNCNAMES;
1219 if (!diffopts)
1220 ;
1221 else if (!prefixcmp(diffopts, "--unified="))
1222 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1223 else if (!prefixcmp(diffopts, "-u"))
1224 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1225 ecb.outf = xdiff_outf;
1226 ecb.priv = &ecbdata;
1227 ecbdata.xm.consume = fn_out_consume;
1228 if (o->color_diff_words)
1229 ecbdata.diff_words =
1230 xcalloc(1, sizeof(struct diff_words_data));
1231 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1232 if (o->color_diff_words)
1233 free_diff_words_data(&ecbdata);
1234 }
1235
1236 free_ab_and_return:
1237 diff_free_filespec_data(one);
1238 diff_free_filespec_data(two);
1239 free(a_one);
1240 free(b_two);
1241 return;
1242 }
1243
1244 static void builtin_diffstat(const char *name_a, const char *name_b,
1245 struct diff_filespec *one,
1246 struct diff_filespec *two,
1247 struct diffstat_t *diffstat,
1248 struct diff_options *o,
1249 int complete_rewrite)
1250 {
1251 mmfile_t mf1, mf2;
1252 struct diffstat_file *data;
1253
1254 data = diffstat_add(diffstat, name_a, name_b);
1255
1256 if (!one || !two) {
1257 data->is_unmerged = 1;
1258 return;
1259 }
1260 if (complete_rewrite) {
1261 diff_populate_filespec(one, 0);
1262 diff_populate_filespec(two, 0);
1263 data->deleted = count_lines(one->data, one->size);
1264 data->added = count_lines(two->data, two->size);
1265 goto free_and_return;
1266 }
1267 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1268 die("unable to read files to diff");
1269
1270 if (file_is_binary(one) || file_is_binary(two)) {
1271 data->is_binary = 1;
1272 data->added = mf2.size;
1273 data->deleted = mf1.size;
1274 } else {
1275 /* Crazy xdl interfaces.. */
1276 xpparam_t xpp;
1277 xdemitconf_t xecfg;
1278 xdemitcb_t ecb;
1279
1280 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
1281 xecfg.ctxlen = 0;
1282 xecfg.flags = 0;
1283 ecb.outf = xdiff_outf;
1284 ecb.priv = diffstat;
1285 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1286 }
1287
1288 free_and_return:
1289 diff_free_filespec_data(one);
1290 diff_free_filespec_data(two);
1291 }
1292
1293 static void builtin_checkdiff(const char *name_a, const char *name_b,
1294 struct diff_filespec *one,
1295 struct diff_filespec *two, struct diff_options *o)
1296 {
1297 mmfile_t mf1, mf2;
1298 struct checkdiff_t data;
1299
1300 if (!two)
1301 return;
1302
1303 memset(&data, 0, sizeof(data));
1304 data.xm.consume = checkdiff_consume;
1305 data.filename = name_b ? name_b : name_a;
1306 data.lineno = 0;
1307 data.color_diff = o->color_diff;
1308
1309 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1310 die("unable to read files to diff");
1311
1312 if (file_is_binary(two))
1313 goto free_and_return;
1314 else {
1315 /* Crazy xdl interfaces.. */
1316 xpparam_t xpp;
1317 xdemitconf_t xecfg;
1318 xdemitcb_t ecb;
1319
1320 xpp.flags = XDF_NEED_MINIMAL;
1321 xecfg.ctxlen = 0;
1322 xecfg.flags = 0;
1323 ecb.outf = xdiff_outf;
1324 ecb.priv = &data;
1325 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1326 }
1327 free_and_return:
1328 diff_free_filespec_data(one);
1329 diff_free_filespec_data(two);
1330 }
1331
1332 struct diff_filespec *alloc_filespec(const char *path)
1333 {
1334 int namelen = strlen(path);
1335 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1336
1337 memset(spec, 0, sizeof(*spec));
1338 spec->path = (char *)(spec + 1);
1339 memcpy(spec->path, path, namelen+1);
1340 return spec;
1341 }
1342
1343 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1344 unsigned short mode)
1345 {
1346 if (mode) {
1347 spec->mode = canon_mode(mode);
1348 hashcpy(spec->sha1, sha1);
1349 spec->sha1_valid = !is_null_sha1(sha1);
1350 }
1351 }
1352
1353 /*
1354 * Given a name and sha1 pair, if the dircache tells us the file in
1355 * the work tree has that object contents, return true, so that
1356 * prepare_temp_file() does not have to inflate and extract.
1357 */
1358 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
1359 {
1360 struct cache_entry *ce;
1361 struct stat st;
1362 int pos, len;
1363
1364 /* We do not read the cache ourselves here, because the
1365 * benchmark with my previous version that always reads cache
1366 * shows that it makes things worse for diff-tree comparing
1367 * two linux-2.6 kernel trees in an already checked out work
1368 * tree. This is because most diff-tree comparisons deal with
1369 * only a small number of files, while reading the cache is
1370 * expensive for a large project, and its cost outweighs the
1371 * savings we get by not inflating the object to a temporary
1372 * file. Practically, this code only helps when we are used
1373 * by diff-cache --cached, which does read the cache before
1374 * calling us.
1375 */
1376 if (!active_cache)
1377 return 0;
1378
1379 /* We want to avoid the working directory if our caller
1380 * doesn't need the data in a normal file, this system
1381 * is rather slow with its stat/open/mmap/close syscalls,
1382 * and the object is contained in a pack file. The pack
1383 * is probably already open and will be faster to obtain
1384 * the data through than the working directory. Loose
1385 * objects however would tend to be slower as they need
1386 * to be individually opened and inflated.
1387 */
1388 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1389 return 0;
1390
1391 len = strlen(name);
1392 pos = cache_name_pos(name, len);
1393 if (pos < 0)
1394 return 0;
1395 ce = active_cache[pos];
1396 if ((lstat(name, &st) < 0) ||
1397 !S_ISREG(st.st_mode) || /* careful! */
1398 ce_match_stat(ce, &st, 0) ||
1399 hashcmp(sha1, ce->sha1))
1400 return 0;
1401 /* we return 1 only when we can stat, it is a regular file,
1402 * stat information matches, and sha1 recorded in the cache
1403 * matches. I.e. we know the file in the work tree really is
1404 * the same as the <name, sha1> pair.
1405 */
1406 return 1;
1407 }
1408
1409 static int populate_from_stdin(struct diff_filespec *s)
1410 {
1411 #define INCREMENT 1024
1412 char *buf;
1413 unsigned long size;
1414 int got;
1415
1416 size = 0;
1417 buf = NULL;
1418 while (1) {
1419 buf = xrealloc(buf, size + INCREMENT);
1420 got = xread(0, buf + size, INCREMENT);
1421 if (!got)
1422 break; /* EOF */
1423 if (got < 0)
1424 return error("error while reading from stdin %s",
1425 strerror(errno));
1426 size += got;
1427 }
1428 s->should_munmap = 0;
1429 s->data = buf;
1430 s->size = size;
1431 s->should_free = 1;
1432 return 0;
1433 }
1434
1435 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1436 {
1437 int len;
1438 char *data = xmalloc(100);
1439 len = snprintf(data, 100,
1440 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1441 s->data = data;
1442 s->size = len;
1443 s->should_free = 1;
1444 if (size_only) {
1445 s->data = NULL;
1446 free(data);
1447 }
1448 return 0;
1449 }
1450
1451 /*
1452 * While doing rename detection and pickaxe operation, we may need to
1453 * grab the data for the blob (or file) for our own in-core comparison.
1454 * diff_filespec has data and size fields for this purpose.
1455 */
1456 int diff_populate_filespec(struct diff_filespec *s, int size_only)
1457 {
1458 int err = 0;
1459 if (!DIFF_FILE_VALID(s))
1460 die("internal error: asking to populate invalid file.");
1461 if (S_ISDIR(s->mode))
1462 return -1;
1463
1464 if (s->data)
1465 return 0;
1466
1467 if (size_only && 0 < s->size)
1468 return 0;
1469
1470 if (S_ISDIRLNK(s->mode))
1471 return diff_populate_gitlink(s, size_only);
1472
1473 if (!s->sha1_valid ||
1474 reuse_worktree_file(s->path, s->sha1, 0)) {
1475 struct stat st;
1476 int fd;
1477 char *buf;
1478 unsigned long size;
1479
1480 if (!strcmp(s->path, "-"))
1481 return populate_from_stdin(s);
1482
1483 if (lstat(s->path, &st) < 0) {
1484 if (errno == ENOENT) {
1485 err_empty:
1486 err = -1;
1487 empty:
1488 s->data = (char *)"";
1489 s->size = 0;
1490 return err;
1491 }
1492 }
1493 s->size = xsize_t(st.st_size);
1494 if (!s->size)
1495 goto empty;
1496 if (size_only)
1497 return 0;
1498 if (S_ISLNK(st.st_mode)) {
1499 int ret;
1500 s->data = xmalloc(s->size);
1501 s->should_free = 1;
1502 ret = readlink(s->path, s->data, s->size);
1503 if (ret < 0) {
1504 free(s->data);
1505 goto err_empty;
1506 }
1507 return 0;
1508 }
1509 fd = open(s->path, O_RDONLY);
1510 if (fd < 0)
1511 goto err_empty;
1512 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
1513 close(fd);
1514 s->should_munmap = 1;
1515
1516 /*
1517 * Convert from working tree format to canonical git format
1518 */
1519 size = s->size;
1520 buf = convert_to_git(s->path, s->data, &size);
1521 if (buf) {
1522 munmap(s->data, s->size);
1523 s->should_munmap = 0;
1524 s->data = buf;
1525 s->size = size;
1526 s->should_free = 1;
1527 }
1528 }
1529 else {
1530 enum object_type type;
1531 if (size_only)
1532 type = sha1_object_info(s->sha1, &s->size);
1533 else {
1534 s->data = read_sha1_file(s->sha1, &type, &s->size);
1535 s->should_free = 1;
1536 }
1537 }
1538 return 0;
1539 }
1540
1541 void diff_free_filespec_data(struct diff_filespec *s)
1542 {
1543 if (s->should_free)
1544 free(s->data);
1545 else if (s->should_munmap)
1546 munmap(s->data, s->size);
1547
1548 if (s->should_free || s->should_munmap) {
1549 s->should_free = s->should_munmap = 0;
1550 s->data = NULL;
1551 }
1552 free(s->cnt_data);
1553 s->cnt_data = NULL;
1554 }
1555
1556 static void prep_temp_blob(struct diff_tempfile *temp,
1557 void *blob,
1558 unsigned long size,
1559 const unsigned char *sha1,
1560 int mode)
1561 {
1562 int fd;
1563
1564 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1565 if (fd < 0)
1566 die("unable to create temp-file");
1567 if (write_in_full(fd, blob, size) != size)
1568 die("unable to write temp-file");
1569 close(fd);
1570 temp->name = temp->tmp_path;
1571 strcpy(temp->hex, sha1_to_hex(sha1));
1572 temp->hex[40] = 0;
1573 sprintf(temp->mode, "%06o", mode);
1574 }
1575
1576 static void prepare_temp_file(const char *name,
1577 struct diff_tempfile *temp,
1578 struct diff_filespec *one)
1579 {
1580 if (!DIFF_FILE_VALID(one)) {
1581 not_a_valid_file:
1582 /* A '-' entry produces this for file-2, and
1583 * a '+' entry produces this for file-1.
1584 */
1585 temp->name = "/dev/null";
1586 strcpy(temp->hex, ".");
1587 strcpy(temp->mode, ".");
1588 return;
1589 }
1590
1591 if (!one->sha1_valid ||
1592 reuse_worktree_file(name, one->sha1, 1)) {
1593 struct stat st;
1594 if (lstat(name, &st) < 0) {
1595 if (errno == ENOENT)
1596 goto not_a_valid_file;
1597 die("stat(%s): %s", name, strerror(errno));
1598 }
1599 if (S_ISLNK(st.st_mode)) {
1600 int ret;
1601 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
1602 size_t sz = xsize_t(st.st_size);
1603 if (sizeof(buf) <= st.st_size)
1604 die("symlink too long: %s", name);
1605 ret = readlink(name, buf, sz);
1606 if (ret < 0)
1607 die("readlink(%s)", name);
1608 prep_temp_blob(temp, buf, sz,
1609 (one->sha1_valid ?
1610 one->sha1 : null_sha1),
1611 (one->sha1_valid ?
1612 one->mode : S_IFLNK));
1613 }
1614 else {
1615 /* we can borrow from the file in the work tree */
1616 temp->name = name;
1617 if (!one->sha1_valid)
1618 strcpy(temp->hex, sha1_to_hex(null_sha1));
1619 else
1620 strcpy(temp->hex, sha1_to_hex(one->sha1));
1621 /* Even though we may sometimes borrow the
1622 * contents from the work tree, we always want
1623 * one->mode. mode is trustworthy even when
1624 * !(one->sha1_valid), as long as
1625 * DIFF_FILE_VALID(one).
1626 */
1627 sprintf(temp->mode, "%06o", one->mode);
1628 }
1629 return;
1630 }
1631 else {
1632 if (diff_populate_filespec(one, 0))
1633 die("cannot read data blob for %s", one->path);
1634 prep_temp_blob(temp, one->data, one->size,
1635 one->sha1, one->mode);
1636 }
1637 }
1638
1639 static void remove_tempfile(void)
1640 {
1641 int i;
1642
1643 for (i = 0; i < 2; i++)
1644 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1645 unlink(diff_temp[i].name);
1646 diff_temp[i].name = NULL;
1647 }
1648 }
1649
1650 static void remove_tempfile_on_signal(int signo)
1651 {
1652 remove_tempfile();
1653 signal(SIGINT, SIG_DFL);
1654 raise(signo);
1655 }
1656
1657 static int spawn_prog(const char *pgm, const char **arg)
1658 {
1659 pid_t pid;
1660 int status;
1661
1662 fflush(NULL);
1663 pid = fork();
1664 if (pid < 0)
1665 die("unable to fork");
1666 if (!pid) {
1667 execvp(pgm, (char *const*) arg);
1668 exit(255);
1669 }
1670
1671 while (waitpid(pid, &status, 0) < 0) {
1672 if (errno == EINTR)
1673 continue;
1674 return -1;
1675 }
1676
1677 /* Earlier we did not check the exit status because
1678 * diff exits non-zero if files are different, and
1679 * we are not interested in knowing that. It was a
1680 * mistake which made it harder to quit a diff-*
1681 * session that uses the git-apply-patch-script as
1682 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1683 * should also exit non-zero only when it wants to
1684 * abort the entire diff-* session.
1685 */
1686 if (WIFEXITED(status) && !WEXITSTATUS(status))
1687 return 0;
1688 return -1;
1689 }
1690
1691 /* An external diff command takes:
1692 *
1693 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1694 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1695 *
1696 */
1697 static void run_external_diff(const char *pgm,
1698 const char *name,
1699 const char *other,
1700 struct diff_filespec *one,
1701 struct diff_filespec *two,
1702 const char *xfrm_msg,
1703 int complete_rewrite)
1704 {
1705 const char *spawn_arg[10];
1706 struct diff_tempfile *temp = diff_temp;
1707 int retval;
1708 static int atexit_asked = 0;
1709 const char *othername;
1710 const char **arg = &spawn_arg[0];
1711
1712 othername = (other? other : name);
1713 if (one && two) {
1714 prepare_temp_file(name, &temp[0], one);
1715 prepare_temp_file(othername, &temp[1], two);
1716 if (! atexit_asked &&
1717 (temp[0].name == temp[0].tmp_path ||
1718 temp[1].name == temp[1].tmp_path)) {
1719 atexit_asked = 1;
1720 atexit(remove_tempfile);
1721 }
1722 signal(SIGINT, remove_tempfile_on_signal);
1723 }
1724
1725 if (one && two) {
1726 *arg++ = pgm;
1727 *arg++ = name;
1728 *arg++ = temp[0].name;
1729 *arg++ = temp[0].hex;
1730 *arg++ = temp[0].mode;
1731 *arg++ = temp[1].name;
1732 *arg++ = temp[1].hex;
1733 *arg++ = temp[1].mode;
1734 if (other) {
1735 *arg++ = other;
1736 *arg++ = xfrm_msg;
1737 }
1738 } else {
1739 *arg++ = pgm;
1740 *arg++ = name;
1741 }
1742 *arg = NULL;
1743 retval = spawn_prog(pgm, spawn_arg);
1744 remove_tempfile();
1745 if (retval) {
1746 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1747 exit(1);
1748 }
1749 }
1750
1751 static const char *external_diff_attr(const char *name)
1752 {
1753 struct git_attr_check attr_diff_check;
1754
1755 setup_diff_attr_check(&attr_diff_check);
1756 if (!git_checkattr(name, 1, &attr_diff_check)) {
1757 const char *value = attr_diff_check.value;
1758 if (!ATTR_TRUE(value) &&
1759 !ATTR_FALSE(value) &&
1760 !ATTR_UNSET(value)) {
1761 struct ll_diff_driver *drv;
1762
1763 if (!user_diff_tail) {
1764 user_diff_tail = &user_diff;
1765 git_config(git_diff_ui_config);
1766 }
1767 for (drv = user_diff; drv; drv = drv->next)
1768 if (!strcmp(drv->name, value))
1769 return drv->cmd;
1770 }
1771 }
1772 return NULL;
1773 }
1774
1775 static void run_diff_cmd(const char *pgm,
1776 const char *name,
1777 const char *other,
1778 struct diff_filespec *one,
1779 struct diff_filespec *two,
1780 const char *xfrm_msg,
1781 struct diff_options *o,
1782 int complete_rewrite)
1783 {
1784 if (!o->allow_external)
1785 pgm = NULL;
1786 else {
1787 const char *cmd = external_diff_attr(name);
1788 if (cmd)
1789 pgm = cmd;
1790 }
1791
1792 if (pgm) {
1793 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1794 complete_rewrite);
1795 return;
1796 }
1797 if (one && two)
1798 builtin_diff(name, other ? other : name,
1799 one, two, xfrm_msg, o, complete_rewrite);
1800 else
1801 printf("* Unmerged path %s\n", name);
1802 }
1803
1804 static void diff_fill_sha1_info(struct diff_filespec *one)
1805 {
1806 if (DIFF_FILE_VALID(one)) {
1807 if (!one->sha1_valid) {
1808 struct stat st;
1809 if (!strcmp(one->path, "-")) {
1810 hashcpy(one->sha1, null_sha1);
1811 return;
1812 }
1813 if (lstat(one->path, &st) < 0)
1814 die("stat %s", one->path);
1815 if (index_path(one->sha1, one->path, &st, 0))
1816 die("cannot hash %s\n", one->path);
1817 }
1818 }
1819 else
1820 hashclr(one->sha1);
1821 }
1822
1823 static void run_diff(struct diff_filepair *p, struct diff_options *o)
1824 {
1825 const char *pgm = external_diff();
1826 char msg[PATH_MAX*2+300], *xfrm_msg;
1827 struct diff_filespec *one;
1828 struct diff_filespec *two;
1829 const char *name;
1830 const char *other;
1831 char *name_munged, *other_munged;
1832 int complete_rewrite = 0;
1833 int len;
1834
1835 if (DIFF_PAIR_UNMERGED(p)) {
1836 /* unmerged */
1837 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
1838 return;
1839 }
1840
1841 name = p->one->path;
1842 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1843 name_munged = quote_one(name);
1844 other_munged = quote_one(other);
1845 one = p->one; two = p->two;
1846
1847 diff_fill_sha1_info(one);
1848 diff_fill_sha1_info(two);
1849
1850 len = 0;
1851 switch (p->status) {
1852 case DIFF_STATUS_COPIED:
1853 len += snprintf(msg + len, sizeof(msg) - len,
1854 "similarity index %d%%\n"
1855 "copy from %s\n"
1856 "copy to %s\n",
1857 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1858 name_munged, other_munged);
1859 break;
1860 case DIFF_STATUS_RENAMED:
1861 len += snprintf(msg + len, sizeof(msg) - len,
1862 "similarity index %d%%\n"
1863 "rename from %s\n"
1864 "rename to %s\n",
1865 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1866 name_munged, other_munged);
1867 break;
1868 case DIFF_STATUS_MODIFIED:
1869 if (p->score) {
1870 len += snprintf(msg + len, sizeof(msg) - len,
1871 "dissimilarity index %d%%\n",
1872 (int)(0.5 + p->score *
1873 100.0/MAX_SCORE));
1874 complete_rewrite = 1;
1875 break;
1876 }
1877 /* fallthru */
1878 default:
1879 /* nothing */
1880 ;
1881 }
1882
1883 if (hashcmp(one->sha1, two->sha1)) {
1884 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1885
1886 if (o->binary) {
1887 mmfile_t mf;
1888 if ((!fill_mmfile(&mf, one) && file_is_binary(one)) ||
1889 (!fill_mmfile(&mf, two) && file_is_binary(two)))
1890 abbrev = 40;
1891 }
1892 len += snprintf(msg + len, sizeof(msg) - len,
1893 "index %.*s..%.*s",
1894 abbrev, sha1_to_hex(one->sha1),
1895 abbrev, sha1_to_hex(two->sha1));
1896 if (one->mode == two->mode)
1897 len += snprintf(msg + len, sizeof(msg) - len,
1898 " %06o", one->mode);
1899 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1900 }
1901
1902 if (len)
1903 msg[--len] = 0;
1904 xfrm_msg = len ? msg : NULL;
1905
1906 if (!pgm &&
1907 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1908 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1909 /* a filepair that changes between file and symlink
1910 * needs to be split into deletion and creation.
1911 */
1912 struct diff_filespec *null = alloc_filespec(two->path);
1913 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
1914 free(null);
1915 null = alloc_filespec(one->path);
1916 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
1917 free(null);
1918 }
1919 else
1920 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
1921 complete_rewrite);
1922
1923 free(name_munged);
1924 free(other_munged);
1925 }
1926
1927 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1928 struct diffstat_t *diffstat)
1929 {
1930 const char *name;
1931 const char *other;
1932 int complete_rewrite = 0;
1933
1934 if (DIFF_PAIR_UNMERGED(p)) {
1935 /* unmerged */
1936 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
1937 return;
1938 }
1939
1940 name = p->one->path;
1941 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1942
1943 diff_fill_sha1_info(p->one);
1944 diff_fill_sha1_info(p->two);
1945
1946 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1947 complete_rewrite = 1;
1948 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
1949 }
1950
1951 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1952 {
1953 const char *name;
1954 const char *other;
1955
1956 if (DIFF_PAIR_UNMERGED(p)) {
1957 /* unmerged */
1958 return;
1959 }
1960
1961 name = p->one->path;
1962 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1963
1964 diff_fill_sha1_info(p->one);
1965 diff_fill_sha1_info(p->two);
1966
1967 builtin_checkdiff(name, other, p->one, p->two, o);
1968 }
1969
1970 void diff_setup(struct diff_options *options)
1971 {
1972 memset(options, 0, sizeof(*options));
1973 options->line_termination = '\n';
1974 options->break_opt = -1;
1975 options->rename_limit = -1;
1976 options->context = 3;
1977 options->msg_sep = "";
1978
1979 options->change = diff_change;
1980 options->add_remove = diff_addremove;
1981 options->color_diff = diff_use_color_default;
1982 options->detect_rename = diff_detect_rename_default;
1983 }
1984
1985 int diff_setup_done(struct diff_options *options)
1986 {
1987 int count = 0;
1988
1989 if (options->output_format & DIFF_FORMAT_NAME)
1990 count++;
1991 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1992 count++;
1993 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1994 count++;
1995 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1996 count++;
1997 if (count > 1)
1998 die("--name-only, --name-status, --check and -s are mutually exclusive");
1999
2000 if (options->find_copies_harder)
2001 options->detect_rename = DIFF_DETECT_COPY;
2002
2003 if (options->output_format & (DIFF_FORMAT_NAME |
2004 DIFF_FORMAT_NAME_STATUS |
2005 DIFF_FORMAT_CHECKDIFF |
2006 DIFF_FORMAT_NO_OUTPUT))
2007 options->output_format &= ~(DIFF_FORMAT_RAW |
2008 DIFF_FORMAT_NUMSTAT |
2009 DIFF_FORMAT_DIFFSTAT |
2010 DIFF_FORMAT_SHORTSTAT |
2011 DIFF_FORMAT_SUMMARY |
2012 DIFF_FORMAT_PATCH);
2013
2014 /*
2015 * These cases always need recursive; we do not drop caller-supplied
2016 * recursive bits for other formats here.
2017 */
2018 if (options->output_format & (DIFF_FORMAT_PATCH |
2019 DIFF_FORMAT_NUMSTAT |
2020 DIFF_FORMAT_DIFFSTAT |
2021 DIFF_FORMAT_SHORTSTAT |
2022 DIFF_FORMAT_SUMMARY |
2023 DIFF_FORMAT_CHECKDIFF))
2024 options->recursive = 1;
2025 /*
2026 * Also pickaxe would not work very well if you do not say recursive
2027 */
2028 if (options->pickaxe)
2029 options->recursive = 1;
2030
2031 if (options->detect_rename && options->rename_limit < 0)
2032 options->rename_limit = diff_rename_limit_default;
2033 if (options->setup & DIFF_SETUP_USE_CACHE) {
2034 if (!active_cache)
2035 /* read-cache does not die even when it fails
2036 * so it is safe for us to do this here. Also
2037 * it does not smudge active_cache or active_nr
2038 * when it fails, so we do not have to worry about
2039 * cleaning it up ourselves either.
2040 */
2041 read_cache();
2042 }
2043 if (options->abbrev <= 0 || 40 < options->abbrev)
2044 options->abbrev = 40; /* full */
2045
2046 /*
2047 * It does not make sense to show the first hit we happened
2048 * to have found. It does not make sense not to return with
2049 * exit code in such a case either.
2050 */
2051 if (options->quiet) {
2052 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2053 options->exit_with_status = 1;
2054 }
2055
2056 /*
2057 * If we postprocess in diffcore, we cannot simply return
2058 * upon the first hit. We need to run diff as usual.
2059 */
2060 if (options->pickaxe || options->filter)
2061 options->quiet = 0;
2062
2063 return 0;
2064 }
2065
2066 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2067 {
2068 char c, *eq;
2069 int len;
2070
2071 if (*arg != '-')
2072 return 0;
2073 c = *++arg;
2074 if (!c)
2075 return 0;
2076 if (c == arg_short) {
2077 c = *++arg;
2078 if (!c)
2079 return 1;
2080 if (val && isdigit(c)) {
2081 char *end;
2082 int n = strtoul(arg, &end, 10);
2083 if (*end)
2084 return 0;
2085 *val = n;
2086 return 1;
2087 }
2088 return 0;
2089 }
2090 if (c != '-')
2091 return 0;
2092 arg++;
2093 eq = strchr(arg, '=');
2094 if (eq)
2095 len = eq - arg;
2096 else
2097 len = strlen(arg);
2098 if (!len || strncmp(arg, arg_long, len))
2099 return 0;
2100 if (eq) {
2101 int n;
2102 char *end;
2103 if (!isdigit(*++eq))
2104 return 0;
2105 n = strtoul(eq, &end, 10);
2106 if (*end)
2107 return 0;
2108 *val = n;
2109 }
2110 return 1;
2111 }
2112
2113 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2114 {
2115 const char *arg = av[0];
2116 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
2117 options->output_format |= DIFF_FORMAT_PATCH;
2118 else if (opt_arg(arg, 'U', "unified", &options->context))
2119 options->output_format |= DIFF_FORMAT_PATCH;
2120 else if (!strcmp(arg, "--raw"))
2121 options->output_format |= DIFF_FORMAT_RAW;
2122 else if (!strcmp(arg, "--patch-with-raw")) {
2123 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
2124 }
2125 else if (!strcmp(arg, "--numstat")) {
2126 options->output_format |= DIFF_FORMAT_NUMSTAT;
2127 }
2128 else if (!strcmp(arg, "--shortstat")) {
2129 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2130 }
2131 else if (!prefixcmp(arg, "--stat")) {
2132 char *end;
2133 int width = options->stat_width;
2134 int name_width = options->stat_name_width;
2135 arg += 6;
2136 end = (char *)arg;
2137
2138 switch (*arg) {
2139 case '-':
2140 if (!prefixcmp(arg, "-width="))
2141 width = strtoul(arg + 7, &end, 10);
2142 else if (!prefixcmp(arg, "-name-width="))
2143 name_width = strtoul(arg + 12, &end, 10);
2144 break;
2145 case '=':
2146 width = strtoul(arg+1, &end, 10);
2147 if (*end == ',')
2148 name_width = strtoul(end+1, &end, 10);
2149 }
2150
2151 /* Important! This checks all the error cases! */
2152 if (*end)
2153 return 0;
2154 options->output_format |= DIFF_FORMAT_DIFFSTAT;
2155 options->stat_name_width = name_width;
2156 options->stat_width = width;
2157 }
2158 else if (!strcmp(arg, "--check"))
2159 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2160 else if (!strcmp(arg, "--summary"))
2161 options->output_format |= DIFF_FORMAT_SUMMARY;
2162 else if (!strcmp(arg, "--patch-with-stat")) {
2163 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2164 }
2165 else if (!strcmp(arg, "-z"))
2166 options->line_termination = 0;
2167 else if (!prefixcmp(arg, "-l"))
2168 options->rename_limit = strtoul(arg+2, NULL, 10);
2169 else if (!strcmp(arg, "--full-index"))
2170 options->full_index = 1;
2171 else if (!strcmp(arg, "--binary")) {
2172 options->output_format |= DIFF_FORMAT_PATCH;
2173 options->binary = 1;
2174 }
2175 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
2176 options->text = 1;
2177 }
2178 else if (!strcmp(arg, "--name-only"))
2179 options->output_format |= DIFF_FORMAT_NAME;
2180 else if (!strcmp(arg, "--name-status"))
2181 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2182 else if (!strcmp(arg, "-R"))
2183 options->reverse_diff = 1;
2184 else if (!prefixcmp(arg, "-S"))
2185 options->pickaxe = arg + 2;
2186 else if (!strcmp(arg, "-s")) {
2187 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2188 }
2189 else if (!prefixcmp(arg, "-O"))
2190 options->orderfile = arg + 2;
2191 else if (!prefixcmp(arg, "--diff-filter="))
2192 options->filter = arg + 14;
2193 else if (!strcmp(arg, "--pickaxe-all"))
2194 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2195 else if (!strcmp(arg, "--pickaxe-regex"))
2196 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2197 else if (!prefixcmp(arg, "-B")) {
2198 if ((options->break_opt =
2199 diff_scoreopt_parse(arg)) == -1)
2200 return -1;
2201 }
2202 else if (!prefixcmp(arg, "-M")) {
2203 if ((options->rename_score =
2204 diff_scoreopt_parse(arg)) == -1)
2205 return -1;
2206 options->detect_rename = DIFF_DETECT_RENAME;
2207 }
2208 else if (!prefixcmp(arg, "-C")) {
2209 if ((options->rename_score =
2210 diff_scoreopt_parse(arg)) == -1)
2211 return -1;
2212 options->detect_rename = DIFF_DETECT_COPY;
2213 }
2214 else if (!strcmp(arg, "--find-copies-harder"))
2215 options->find_copies_harder = 1;
2216 else if (!strcmp(arg, "--abbrev"))
2217 options->abbrev = DEFAULT_ABBREV;
2218 else if (!prefixcmp(arg, "--abbrev=")) {
2219 options->abbrev = strtoul(arg + 9, NULL, 10);
2220 if (options->abbrev < MINIMUM_ABBREV)
2221 options->abbrev = MINIMUM_ABBREV;
2222 else if (40 < options->abbrev)
2223 options->abbrev = 40;
2224 }
2225 else if (!strcmp(arg, "--color"))
2226 options->color_diff = 1;
2227 else if (!strcmp(arg, "--no-color"))
2228 options->color_diff = 0;
2229 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2230 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2231 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2232 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2233 else if (!strcmp(arg, "--ignore-space-at-eol"))
2234 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2235 else if (!strcmp(arg, "--color-words"))
2236 options->color_diff = options->color_diff_words = 1;
2237 else if (!strcmp(arg, "--no-renames"))
2238 options->detect_rename = 0;
2239 else if (!strcmp(arg, "--exit-code"))
2240 options->exit_with_status = 1;
2241 else if (!strcmp(arg, "--quiet"))
2242 options->quiet = 1;
2243 else
2244 return 0;
2245 return 1;
2246 }
2247
2248 static int parse_num(const char **cp_p)
2249 {
2250 unsigned long num, scale;
2251 int ch, dot;
2252 const char *cp = *cp_p;
2253
2254 num = 0;
2255 scale = 1;
2256 dot = 0;
2257 for(;;) {
2258 ch = *cp;
2259 if ( !dot && ch == '.' ) {
2260 scale = 1;
2261 dot = 1;
2262 } else if ( ch == '%' ) {
2263 scale = dot ? scale*100 : 100;
2264 cp++; /* % is always at the end */
2265 break;
2266 } else if ( ch >= '0' && ch <= '9' ) {
2267 if ( scale < 100000 ) {
2268 scale *= 10;
2269 num = (num*10) + (ch-'0');
2270 }
2271 } else {
2272 break;
2273 }
2274 cp++;
2275 }
2276 *cp_p = cp;
2277
2278 /* user says num divided by scale and we say internally that
2279 * is MAX_SCORE * num / scale.
2280 */
2281 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
2282 }
2283
2284 int diff_scoreopt_parse(const char *opt)
2285 {
2286 int opt1, opt2, cmd;
2287
2288 if (*opt++ != '-')
2289 return -1;
2290 cmd = *opt++;
2291 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2292 return -1; /* that is not a -M, -C nor -B option */
2293
2294 opt1 = parse_num(&opt);
2295 if (cmd != 'B')
2296 opt2 = 0;
2297 else {
2298 if (*opt == 0)
2299 opt2 = 0;
2300 else if (*opt != '/')
2301 return -1; /* we expect -B80/99 or -B80 */
2302 else {
2303 opt++;
2304 opt2 = parse_num(&opt);
2305 }
2306 }
2307 if (*opt != 0)
2308 return -1;
2309 return opt1 | (opt2 << 16);
2310 }
2311
2312 struct diff_queue_struct diff_queued_diff;
2313
2314 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2315 {
2316 if (queue->alloc <= queue->nr) {
2317 queue->alloc = alloc_nr(queue->alloc);
2318 queue->queue = xrealloc(queue->queue,
2319 sizeof(dp) * queue->alloc);
2320 }
2321 queue->queue[queue->nr++] = dp;
2322 }
2323
2324 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2325 struct diff_filespec *one,
2326 struct diff_filespec *two)
2327 {
2328 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
2329 dp->one = one;
2330 dp->two = two;
2331 if (queue)
2332 diff_q(queue, dp);
2333 return dp;
2334 }
2335
2336 void diff_free_filepair(struct diff_filepair *p)
2337 {
2338 diff_free_filespec_data(p->one);
2339 diff_free_filespec_data(p->two);
2340 free(p->one);
2341 free(p->two);
2342 free(p);
2343 }
2344
2345 /* This is different from find_unique_abbrev() in that
2346 * it stuffs the result with dots for alignment.
2347 */
2348 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2349 {
2350 int abblen;
2351 const char *abbrev;
2352 if (len == 40)
2353 return sha1_to_hex(sha1);
2354
2355 abbrev = find_unique_abbrev(sha1, len);
2356 if (!abbrev)
2357 return sha1_to_hex(sha1);
2358 abblen = strlen(abbrev);
2359 if (abblen < 37) {
2360 static char hex[41];
2361 if (len < abblen && abblen <= len + 2)
2362 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2363 else
2364 sprintf(hex, "%s...", abbrev);
2365 return hex;
2366 }
2367 return sha1_to_hex(sha1);
2368 }
2369
2370 static void diff_flush_raw(struct diff_filepair *p,
2371 struct diff_options *options)
2372 {
2373 int two_paths;
2374 char status[10];
2375 int abbrev = options->abbrev;
2376 const char *path_one, *path_two;
2377 int inter_name_termination = '\t';
2378 int line_termination = options->line_termination;
2379
2380 if (!line_termination)
2381 inter_name_termination = 0;
2382
2383 path_one = p->one->path;
2384 path_two = p->two->path;
2385 if (line_termination) {
2386 path_one = quote_one(path_one);
2387 path_two = quote_one(path_two);
2388 }
2389
2390 if (p->score)
2391 sprintf(status, "%c%03d", p->status,
2392 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2393 else {
2394 status[0] = p->status;
2395 status[1] = 0;
2396 }
2397 switch (p->status) {
2398 case DIFF_STATUS_COPIED:
2399 case DIFF_STATUS_RENAMED:
2400 two_paths = 1;
2401 break;
2402 case DIFF_STATUS_ADDED:
2403 case DIFF_STATUS_DELETED:
2404 two_paths = 0;
2405 break;
2406 default:
2407 two_paths = 0;
2408 break;
2409 }
2410 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
2411 printf(":%06o %06o %s ",
2412 p->one->mode, p->two->mode,
2413 diff_unique_abbrev(p->one->sha1, abbrev));
2414 printf("%s ",
2415 diff_unique_abbrev(p->two->sha1, abbrev));
2416 }
2417 printf("%s%c%s", status, inter_name_termination, path_one);
2418 if (two_paths)
2419 printf("%c%s", inter_name_termination, path_two);
2420 putchar(line_termination);
2421 if (path_one != p->one->path)
2422 free((void*)path_one);
2423 if (path_two != p->two->path)
2424 free((void*)path_two);
2425 }
2426
2427 static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
2428 {
2429 char *path = p->two->path;
2430
2431 if (opt->line_termination)
2432 path = quote_one(p->two->path);
2433 printf("%s%c", path, opt->line_termination);
2434 if (p->two->path != path)
2435 free(path);
2436 }
2437
2438 int diff_unmodified_pair(struct diff_filepair *p)
2439 {
2440 /* This function is written stricter than necessary to support
2441 * the currently implemented transformers, but the idea is to
2442 * let transformers to produce diff_filepairs any way they want,
2443 * and filter and clean them up here before producing the output.
2444 */
2445 struct diff_filespec *one, *two;
2446
2447 if (DIFF_PAIR_UNMERGED(p))
2448 return 0; /* unmerged is interesting */
2449
2450 one = p->one;
2451 two = p->two;
2452
2453 /* deletion, addition, mode or type change
2454 * and rename are all interesting.
2455 */
2456 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2457 DIFF_PAIR_MODE_CHANGED(p) ||
2458 strcmp(one->path, two->path))
2459 return 0;
2460
2461 /* both are valid and point at the same path. that is, we are
2462 * dealing with a change.
2463 */
2464 if (one->sha1_valid && two->sha1_valid &&
2465 !hashcmp(one->sha1, two->sha1))
2466 return 1; /* no change */
2467 if (!one->sha1_valid && !two->sha1_valid)
2468 return 1; /* both look at the same file on the filesystem. */
2469 return 0;
2470 }
2471
2472 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2473 {
2474 if (diff_unmodified_pair(p))
2475 return;
2476
2477 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2478 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2479 return; /* no tree diffs in patch format */
2480
2481 run_diff(p, o);
2482 }
2483
2484 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2485 struct diffstat_t *diffstat)
2486 {
2487 if (diff_unmodified_pair(p))
2488 return;
2489
2490 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2491 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2492 return; /* no tree diffs in patch format */
2493
2494 run_diffstat(p, o, diffstat);
2495 }
2496
2497 static void diff_flush_checkdiff(struct diff_filepair *p,
2498 struct diff_options *o)
2499 {
2500 if (diff_unmodified_pair(p))
2501 return;
2502
2503 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2504 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2505 return; /* no tree diffs in patch format */
2506
2507 run_checkdiff(p, o);
2508 }
2509
2510 int diff_queue_is_empty(void)
2511 {
2512 struct diff_queue_struct *q = &diff_queued_diff;
2513 int i;
2514 for (i = 0; i < q->nr; i++)
2515 if (!diff_unmodified_pair(q->queue[i]))
2516 return 0;
2517 return 1;
2518 }
2519
2520 #if DIFF_DEBUG
2521 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2522 {
2523 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2524 x, one ? one : "",
2525 s->path,
2526 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2527 s->mode,
2528 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2529 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2530 x, one ? one : "",
2531 s->size, s->xfrm_flags);
2532 }
2533
2534 void diff_debug_filepair(const struct diff_filepair *p, int i)
2535 {
2536 diff_debug_filespec(p->one, i, "one");
2537 diff_debug_filespec(p->two, i, "two");
2538 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2539 p->score, p->status ? p->status : '?',
2540 p->source_stays, p->broken_pair);
2541 }
2542
2543 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2544 {
2545 int i;
2546 if (msg)
2547 fprintf(stderr, "%s\n", msg);
2548 fprintf(stderr, "q->nr = %d\n", q->nr);
2549 for (i = 0; i < q->nr; i++) {
2550 struct diff_filepair *p = q->queue[i];
2551 diff_debug_filepair(p, i);
2552 }
2553 }
2554 #endif
2555
2556 static void diff_resolve_rename_copy(void)
2557 {
2558 int i, j;
2559 struct diff_filepair *p, *pp;
2560 struct diff_queue_struct *q = &diff_queued_diff;
2561
2562 diff_debug_queue("resolve-rename-copy", q);
2563
2564 for (i = 0; i < q->nr; i++) {
2565 p = q->queue[i];
2566 p->status = 0; /* undecided */
2567 if (DIFF_PAIR_UNMERGED(p))
2568 p->status = DIFF_STATUS_UNMERGED;
2569 else if (!DIFF_FILE_VALID(p->one))
2570 p->status = DIFF_STATUS_ADDED;
2571 else if (!DIFF_FILE_VALID(p->two))
2572 p->status = DIFF_STATUS_DELETED;
2573 else if (DIFF_PAIR_TYPE_CHANGED(p))
2574 p->status = DIFF_STATUS_TYPE_CHANGED;
2575
2576 /* from this point on, we are dealing with a pair
2577 * whose both sides are valid and of the same type, i.e.
2578 * either in-place edit or rename/copy edit.
2579 */
2580 else if (DIFF_PAIR_RENAME(p)) {
2581 if (p->source_stays) {
2582 p->status = DIFF_STATUS_COPIED;
2583 continue;
2584 }
2585 /* See if there is some other filepair that
2586 * copies from the same source as us. If so
2587 * we are a copy. Otherwise we are either a
2588 * copy if the path stays, or a rename if it
2589 * does not, but we already handled "stays" case.
2590 */
2591 for (j = i + 1; j < q->nr; j++) {
2592 pp = q->queue[j];
2593 if (strcmp(pp->one->path, p->one->path))
2594 continue; /* not us */
2595 if (!DIFF_PAIR_RENAME(pp))
2596 continue; /* not a rename/copy */
2597 /* pp is a rename/copy from the same source */
2598 p->status = DIFF_STATUS_COPIED;
2599 break;
2600 }
2601 if (!p->status)
2602 p->status = DIFF_STATUS_RENAMED;
2603 }
2604 else if (hashcmp(p->one->sha1, p->two->sha1) ||
2605 p->one->mode != p->two->mode ||
2606 is_null_sha1(p->one->sha1))
2607 p->status = DIFF_STATUS_MODIFIED;
2608 else {
2609 /* This is a "no-change" entry and should not
2610 * happen anymore, but prepare for broken callers.
2611 */
2612 error("feeding unmodified %s to diffcore",
2613 p->one->path);
2614 p->status = DIFF_STATUS_UNKNOWN;
2615 }
2616 }
2617 diff_debug_queue("resolve-rename-copy done", q);
2618 }
2619
2620 static int check_pair_status(struct diff_filepair *p)
2621 {
2622 switch (p->status) {
2623 case DIFF_STATUS_UNKNOWN:
2624 return 0;
2625 case 0:
2626 die("internal error in diff-resolve-rename-copy");
2627 default:
2628 return 1;
2629 }
2630 }
2631
2632 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2633 {
2634 int fmt = opt->output_format;
2635
2636 if (fmt & DIFF_FORMAT_CHECKDIFF)
2637 diff_flush_checkdiff(p, opt);
2638 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2639 diff_flush_raw(p, opt);
2640 else if (fmt & DIFF_FORMAT_NAME)
2641 diff_flush_name(p, opt);
2642 }
2643
2644 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2645 {
2646 char *name = quote_one(fs->path);
2647 if (fs->mode)
2648 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
2649 else
2650 printf(" %s %s\n", newdelete, name);
2651 free(name);
2652 }
2653
2654
2655 static void show_mode_change(struct diff_filepair *p, int show_name)
2656 {
2657 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
2658 if (show_name) {
2659 char *name = quote_one(p->two->path);
2660 printf(" mode change %06o => %06o %s\n",
2661 p->one->mode, p->two->mode, name);
2662 free(name);
2663 }
2664 else
2665 printf(" mode change %06o => %06o\n",
2666 p->one->mode, p->two->mode);
2667 }
2668 }
2669
2670 static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2671 {
2672 char *names = pprint_rename(p->one->path, p->two->path);
2673
2674 printf(" %s %s (%d%%)\n", renamecopy, names,
2675 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2676 free(names);
2677 show_mode_change(p, 0);
2678 }
2679
2680 static void diff_summary(struct diff_filepair *p)
2681 {
2682 switch(p->status) {
2683 case DIFF_STATUS_DELETED:
2684 show_file_mode_name("delete", p->one);
2685 break;
2686 case DIFF_STATUS_ADDED:
2687 show_file_mode_name("create", p->two);
2688 break;
2689 case DIFF_STATUS_COPIED:
2690 show_rename_copy("copy", p);
2691 break;
2692 case DIFF_STATUS_RENAMED:
2693 show_rename_copy("rename", p);
2694 break;
2695 default:
2696 if (p->score) {
2697 char *name = quote_one(p->two->path);
2698 printf(" rewrite %s (%d%%)\n", name,
2699 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2700 free(name);
2701 show_mode_change(p, 0);
2702 } else show_mode_change(p, 1);
2703 break;
2704 }
2705 }
2706
2707 struct patch_id_t {
2708 struct xdiff_emit_state xm;
2709 SHA_CTX *ctx;
2710 int patchlen;
2711 };
2712
2713 static int remove_space(char *line, int len)
2714 {
2715 int i;
2716 char *dst = line;
2717 unsigned char c;
2718
2719 for (i = 0; i < len; i++)
2720 if (!isspace((c = line[i])))
2721 *dst++ = c;
2722
2723 return dst - line;
2724 }
2725
2726 static void patch_id_consume(void *priv, char *line, unsigned long len)
2727 {
2728 struct patch_id_t *data = priv;
2729 int new_len;
2730
2731 /* Ignore line numbers when computing the SHA1 of the patch */
2732 if (!prefixcmp(line, "@@ -"))
2733 return;
2734
2735 new_len = remove_space(line, len);
2736
2737 SHA1_Update(data->ctx, line, new_len);
2738 data->patchlen += new_len;
2739 }
2740
2741 /* returns 0 upon success, and writes result into sha1 */
2742 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2743 {
2744 struct diff_queue_struct *q = &diff_queued_diff;
2745 int i;
2746 SHA_CTX ctx;
2747 struct patch_id_t data;
2748 char buffer[PATH_MAX * 4 + 20];
2749
2750 SHA1_Init(&ctx);
2751 memset(&data, 0, sizeof(struct patch_id_t));
2752 data.ctx = &ctx;
2753 data.xm.consume = patch_id_consume;
2754
2755 for (i = 0; i < q->nr; i++) {
2756 xpparam_t xpp;
2757 xdemitconf_t xecfg;
2758 xdemitcb_t ecb;
2759 mmfile_t mf1, mf2;
2760 struct diff_filepair *p = q->queue[i];
2761 int len1, len2;
2762
2763 if (p->status == 0)
2764 return error("internal diff status error");
2765 if (p->status == DIFF_STATUS_UNKNOWN)
2766 continue;
2767 if (diff_unmodified_pair(p))
2768 continue;
2769 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2770 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2771 continue;
2772 if (DIFF_PAIR_UNMERGED(p))
2773 continue;
2774
2775 diff_fill_sha1_info(p->one);
2776 diff_fill_sha1_info(p->two);
2777 if (fill_mmfile(&mf1, p->one) < 0 ||
2778 fill_mmfile(&mf2, p->two) < 0)
2779 return error("unable to read files to diff");
2780
2781 /* Maybe hash p->two? into the patch id? */
2782 if (file_is_binary(p->two))
2783 continue;
2784
2785 len1 = remove_space(p->one->path, strlen(p->one->path));
2786 len2 = remove_space(p->two->path, strlen(p->two->path));
2787 if (p->one->mode == 0)
2788 len1 = snprintf(buffer, sizeof(buffer),
2789 "diff--gita/%.*sb/%.*s"
2790 "newfilemode%06o"
2791 "---/dev/null"
2792 "+++b/%.*s",
2793 len1, p->one->path,
2794 len2, p->two->path,
2795 p->two->mode,
2796 len2, p->two->path);
2797 else if (p->two->mode == 0)
2798 len1 = snprintf(buffer, sizeof(buffer),
2799 "diff--gita/%.*sb/%.*s"
2800 "deletedfilemode%06o"
2801 "---a/%.*s"
2802 "+++/dev/null",
2803 len1, p->one->path,
2804 len2, p->two->path,
2805 p->one->mode,
2806 len1, p->one->path);
2807 else
2808 len1 = snprintf(buffer, sizeof(buffer),
2809 "diff--gita/%.*sb/%.*s"
2810 "---a/%.*s"
2811 "+++b/%.*s",
2812 len1, p->one->path,
2813 len2, p->two->path,
2814 len1, p->one->path,
2815 len2, p->two->path);
2816 SHA1_Update(&ctx, buffer, len1);
2817
2818 xpp.flags = XDF_NEED_MINIMAL;
2819 xecfg.ctxlen = 3;
2820 xecfg.flags = XDL_EMIT_FUNCNAMES;
2821 ecb.outf = xdiff_outf;
2822 ecb.priv = &data;
2823 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2824 }
2825
2826 SHA1_Final(sha1, &ctx);
2827 return 0;
2828 }
2829
2830 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2831 {
2832 struct diff_queue_struct *q = &diff_queued_diff;
2833 int i;
2834 int result = diff_get_patch_id(options, sha1);
2835
2836 for (i = 0; i < q->nr; i++)
2837 diff_free_filepair(q->queue[i]);
2838
2839 free(q->queue);
2840 q->queue = NULL;
2841 q->nr = q->alloc = 0;
2842
2843 return result;
2844 }
2845
2846 static int is_summary_empty(const struct diff_queue_struct *q)
2847 {
2848 int i;
2849
2850 for (i = 0; i < q->nr; i++) {
2851 const struct diff_filepair *p = q->queue[i];
2852
2853 switch (p->status) {
2854 case DIFF_STATUS_DELETED:
2855 case DIFF_STATUS_ADDED:
2856 case DIFF_STATUS_COPIED:
2857 case DIFF_STATUS_RENAMED:
2858 return 0;
2859 default:
2860 if (p->score)
2861 return 0;
2862 if (p->one->mode && p->two->mode &&
2863 p->one->mode != p->two->mode)
2864 return 0;
2865 break;
2866 }
2867 }
2868 return 1;
2869 }
2870
2871 void diff_flush(struct diff_options *options)
2872 {
2873 struct diff_queue_struct *q = &diff_queued_diff;
2874 int i, output_format = options->output_format;
2875 int separator = 0;
2876
2877 /*
2878 * Order: raw, stat, summary, patch
2879 * or: name/name-status/checkdiff (other bits clear)
2880 */
2881 if (!q->nr)
2882 goto free_queue;
2883
2884 if (output_format & (DIFF_FORMAT_RAW |
2885 DIFF_FORMAT_NAME |
2886 DIFF_FORMAT_NAME_STATUS |
2887 DIFF_FORMAT_CHECKDIFF)) {
2888 for (i = 0; i < q->nr; i++) {
2889 struct diff_filepair *p = q->queue[i];
2890 if (check_pair_status(p))
2891 flush_one_pair(p, options);
2892 }
2893 separator++;
2894 }
2895
2896 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
2897 struct diffstat_t diffstat;
2898
2899 memset(&diffstat, 0, sizeof(struct diffstat_t));
2900 diffstat.xm.consume = diffstat_consume;
2901 for (i = 0; i < q->nr; i++) {
2902 struct diff_filepair *p = q->queue[i];
2903 if (check_pair_status(p))
2904 diff_flush_stat(p, options, &diffstat);
2905 }
2906 if (output_format & DIFF_FORMAT_NUMSTAT)
2907 show_numstat(&diffstat, options);
2908 if (output_format & DIFF_FORMAT_DIFFSTAT)
2909 show_stats(&diffstat, options);
2910 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2911 show_shortstats(&diffstat);
2912 separator++;
2913 }
2914
2915 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
2916 for (i = 0; i < q->nr; i++)
2917 diff_summary(q->queue[i]);
2918 separator++;
2919 }
2920
2921 if (output_format & DIFF_FORMAT_PATCH) {
2922 if (separator) {
2923 if (options->stat_sep) {
2924 /* attach patch instead of inline */
2925 fputs(options->stat_sep, stdout);
2926 } else {
2927 putchar(options->line_termination);
2928 }
2929 }
2930
2931 for (i = 0; i < q->nr; i++) {
2932 struct diff_filepair *p = q->queue[i];
2933 if (check_pair_status(p))
2934 diff_flush_patch(p, options);
2935 }
2936 }
2937
2938 if (output_format & DIFF_FORMAT_CALLBACK)
2939 options->format_callback(q, options, options->format_callback_data);
2940
2941 for (i = 0; i < q->nr; i++)
2942 diff_free_filepair(q->queue[i]);
2943 free_queue:
2944 free(q->queue);
2945 q->queue = NULL;
2946 q->nr = q->alloc = 0;
2947 }
2948
2949 static void diffcore_apply_filter(const char *filter)
2950 {
2951 int i;
2952 struct diff_queue_struct *q = &diff_queued_diff;
2953 struct diff_queue_struct outq;
2954 outq.queue = NULL;
2955 outq.nr = outq.alloc = 0;
2956
2957 if (!filter)
2958 return;
2959
2960 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2961 int found;
2962 for (i = found = 0; !found && i < q->nr; i++) {
2963 struct diff_filepair *p = q->queue[i];
2964 if (((p->status == DIFF_STATUS_MODIFIED) &&
2965 ((p->score &&
2966 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2967 (!p->score &&
2968 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2969 ((p->status != DIFF_STATUS_MODIFIED) &&
2970 strchr(filter, p->status)))
2971 found++;
2972 }
2973 if (found)
2974 return;
2975
2976 /* otherwise we will clear the whole queue
2977 * by copying the empty outq at the end of this
2978 * function, but first clear the current entries
2979 * in the queue.
2980 */
2981 for (i = 0; i < q->nr; i++)
2982 diff_free_filepair(q->queue[i]);
2983 }
2984 else {
2985 /* Only the matching ones */
2986 for (i = 0; i < q->nr; i++) {
2987 struct diff_filepair *p = q->queue[i];
2988
2989 if (((p->status == DIFF_STATUS_MODIFIED) &&
2990 ((p->score &&
2991 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2992 (!p->score &&
2993 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2994 ((p->status != DIFF_STATUS_MODIFIED) &&
2995 strchr(filter, p->status)))
2996 diff_q(&outq, p);
2997 else
2998 diff_free_filepair(p);
2999 }
3000 }
3001 free(q->queue);
3002 *q = outq;
3003 }
3004
3005 void diffcore_std(struct diff_options *options)
3006 {
3007 if (options->quiet)
3008 return;
3009 if (options->break_opt != -1)
3010 diffcore_break(options->break_opt);
3011 if (options->detect_rename)
3012 diffcore_rename(options);
3013 if (options->break_opt != -1)
3014 diffcore_merge_broken();
3015 if (options->pickaxe)
3016 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3017 if (options->orderfile)
3018 diffcore_order(options->orderfile);
3019 diff_resolve_rename_copy();
3020 diffcore_apply_filter(options->filter);
3021
3022 options->has_changes = !!diff_queued_diff.nr;
3023 }
3024
3025
3026 void diff_addremove(struct diff_options *options,
3027 int addremove, unsigned mode,
3028 const unsigned char *sha1,
3029 const char *base, const char *path)
3030 {
3031 char concatpath[PATH_MAX];
3032 struct diff_filespec *one, *two;
3033
3034 /* This may look odd, but it is a preparation for
3035 * feeding "there are unchanged files which should
3036 * not produce diffs, but when you are doing copy
3037 * detection you would need them, so here they are"
3038 * entries to the diff-core. They will be prefixed
3039 * with something like '=' or '*' (I haven't decided
3040 * which but should not make any difference).
3041 * Feeding the same new and old to diff_change()
3042 * also has the same effect.
3043 * Before the final output happens, they are pruned after
3044 * merged into rename/copy pairs as appropriate.
3045 */
3046 if (options->reverse_diff)
3047 addremove = (addremove == '+' ? '-' :
3048 addremove == '-' ? '+' : addremove);
3049
3050 if (!path) path = "";
3051 sprintf(concatpath, "%s%s", base, path);
3052 one = alloc_filespec(concatpath);
3053 two = alloc_filespec(concatpath);
3054
3055 if (addremove != '+')
3056 fill_filespec(one, sha1, mode);
3057 if (addremove != '-')
3058 fill_filespec(two, sha1, mode);
3059
3060 diff_queue(&diff_queued_diff, one, two);
3061 options->has_changes = 1;
3062 }
3063
3064 void diff_change(struct diff_options *options,
3065 unsigned old_mode, unsigned new_mode,
3066 const unsigned char *old_sha1,
3067 const unsigned char *new_sha1,
3068 const char *base, const char *path)
3069 {
3070 char concatpath[PATH_MAX];
3071 struct diff_filespec *one, *two;
3072
3073 if (options->reverse_diff) {
3074 unsigned tmp;
3075 const unsigned char *tmp_c;
3076 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3077 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3078 }
3079 if (!path) path = "";
3080 sprintf(concatpath, "%s%s", base, path);
3081 one = alloc_filespec(concatpath);
3082 two = alloc_filespec(concatpath);
3083 fill_filespec(one, old_sha1, old_mode);
3084 fill_filespec(two, new_sha1, new_mode);
3085
3086 diff_queue(&diff_queued_diff, one, two);
3087 options->has_changes = 1;
3088 }
3089
3090 void diff_unmerge(struct diff_options *options,
3091 const char *path,
3092 unsigned mode, const unsigned char *sha1)
3093 {
3094 struct diff_filespec *one, *two;
3095 one = alloc_filespec(path);
3096 two = alloc_filespec(path);
3097 fill_filespec(one, sha1, mode);
3098 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
3099 }
Jonathan Nieder’s miscellaneous git branches