Support 'diff=pgm' attribute
[git/git.git] / diff.c
CommitLineData
6973dcae
JH
1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
6973dcae
JH
4#include "cache.h"
5#include "quote.h"
6#include "diff.h"
7#include "diffcore.h"
051308f6 8#include "delta.h"
6973dcae 9#include "xdiff-interface.h"
7c92fe0e 10#include "color.h"
8c701249 11#include "attr.h"
6973dcae 12
1510fea7
SP
13#ifdef NO_FAST_WORKING_DIRECTORY
14#define FAST_WORKING_DIRECTORY 0
15#else
16#define FAST_WORKING_DIRECTORY 1
17#endif
18
6973dcae
JH
19static int use_size_cache;
20
96f1e58f 21static int diff_detect_rename_default;
801235c5 22static int diff_rename_limit_default = -1;
96f1e58f 23static int diff_use_color_default;
6973dcae 24
7c92fe0e 25static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 26 "\033[m", /* reset */
448c3ef1
JH
27 "", /* PLAIN (normal) */
28 "\033[1m", /* METAINFO (bold) */
29 "\033[36m", /* FRAGINFO (cyan) */
30 "\033[31m", /* OLD (red) */
31 "\033[32m", /* NEW (green) */
32 "\033[33m", /* COMMIT (yellow) */
33 "\033[41m", /* WHITESPACE (red background) */
cd112cef
JS
34};
35
801235c5
JH
36static int parse_diff_color_slot(const char *var, int ofs)
37{
38 if (!strcasecmp(var+ofs, "plain"))
39 return DIFF_PLAIN;
40 if (!strcasecmp(var+ofs, "meta"))
41 return DIFF_METAINFO;
42 if (!strcasecmp(var+ofs, "frag"))
43 return DIFF_FRAGINFO;
44 if (!strcasecmp(var+ofs, "old"))
45 return DIFF_FILE_OLD;
46 if (!strcasecmp(var+ofs, "new"))
47 return DIFF_FILE_NEW;
ce436973
JK
48 if (!strcasecmp(var+ofs, "commit"))
49 return DIFF_COMMIT;
448c3ef1
JH
50 if (!strcasecmp(var+ofs, "whitespace"))
51 return DIFF_WHITESPACE;
801235c5
JH
52 die("bad config variable '%s'", var);
53}
54
f1af60bd
JH
55static struct ll_diff_driver {
56 const char *name;
57 struct ll_diff_driver *next;
58 char *cmd;
59} *user_diff, **user_diff_tail;
60
61/*
62 * Currently there is only "diff.<drivername>.command" variable;
63 * because there are "diff.color.<slot>" variables, we are parsing
64 * this in a bit convoluted way to allow low level diff driver
65 * called "color".
66 */
67static int parse_lldiff_command(const char *var, const char *ep, const char *value)
68{
69 const char *name;
70 int namelen;
71 struct ll_diff_driver *drv;
72
73 name = var + 5;
74 namelen = ep - name;
75 for (drv = user_diff; drv; drv = drv->next)
76 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
77 break;
78 if (!drv) {
79 char *namebuf;
80 drv = xcalloc(1, sizeof(struct ll_diff_driver));
81 namebuf = xmalloc(namelen + 1);
82 memcpy(namebuf, name, namelen);
83 namebuf[namelen] = 0;
84 drv->name = namebuf;
85 drv->next = NULL;
86 if (!user_diff_tail)
87 user_diff_tail = &user_diff;
88 *user_diff_tail = drv;
89 user_diff_tail = &(drv->next);
90 }
91
92 if (!value)
93 return error("%s: lacks value", var);
94 drv->cmd = strdup(value);
95 return 0;
96}
97
83ad63cf
JH
98/*
99 * These are to give UI layer defaults.
100 * The core-level commands such as git-diff-files should
101 * never be affected by the setting of diff.renames
102 * the user happens to have in the configuration file.
103 */
104int git_diff_ui_config(const char *var, const char *value)
801235c5
JH
105{
106 if (!strcmp(var, "diff.renamelimit")) {
107 diff_rename_limit_default = git_config_int(var, value);
108 return 0;
109 }
a159ca0c 110 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
7c92fe0e 111 diff_use_color_default = git_config_colorbool(var, value);
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JH
112 return 0;
113 }
b68ea12e
EW
114 if (!strcmp(var, "diff.renames")) {
115 if (!value)
116 diff_detect_rename_default = DIFF_DETECT_RENAME;
117 else if (!strcasecmp(value, "copies") ||
118 !strcasecmp(value, "copy"))
119 diff_detect_rename_default = DIFF_DETECT_COPY;
120 else if (git_config_bool(var,value))
121 diff_detect_rename_default = DIFF_DETECT_RENAME;
122 return 0;
123 }
f1af60bd
JH
124 if (!prefixcmp(var, "diff.")) {
125 const char *ep = strrchr(var, '.');
126
127 if (ep != var + 4 && !strcmp(ep, ".command"))
128 return parse_lldiff_command(var, ep, value);
129 }
1968d77d 130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 131 int slot = parse_diff_color_slot(var, 11);
7c92fe0e 132 color_parse(value, var, diff_colors[slot]);
801235c5
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133 return 0;
134 }
f1af60bd 135
801235c5
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136 return git_default_config(var, value);
137}
138
6973dcae
JH
139static char *quote_one(const char *str)
140{
141 int needlen;
142 char *xp;
143
144 if (!str)
145 return NULL;
146 needlen = quote_c_style(str, NULL, NULL, 0);
147 if (!needlen)
9befac47 148 return xstrdup(str);
6973dcae
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149 xp = xmalloc(needlen + 1);
150 quote_c_style(str, xp, NULL, 0);
151 return xp;
152}
153
154static char *quote_two(const char *one, const char *two)
155{
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
158 char *xp;
159
160 if (need_one + need_two) {
161 if (!need_one) need_one = strlen(one);
162 if (!need_two) need_one = strlen(two);
163
164 xp = xmalloc(need_one + need_two + 3);
165 xp[0] = '"';
166 quote_c_style(one, xp + 1, NULL, 1);
167 quote_c_style(two, xp + need_one + 1, NULL, 1);
168 strcpy(xp + need_one + need_two + 1, "\"");
169 return xp;
170 }
171 need_one = strlen(one);
172 need_two = strlen(two);
173 xp = xmalloc(need_one + need_two + 1);
174 strcpy(xp, one);
175 strcpy(xp + need_one, two);
176 return xp;
177}
178
179static const char *external_diff(void)
180{
181 static const char *external_diff_cmd = NULL;
182 static int done_preparing = 0;
183
184 if (done_preparing)
185 return external_diff_cmd;
186 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
187 done_preparing = 1;
188 return external_diff_cmd;
189}
190
191#define TEMPFILE_PATH_LEN 50
192
193static struct diff_tempfile {
194 const char *name; /* filename external diff should read from */
195 char hex[41];
196 char mode[10];
197 char tmp_path[TEMPFILE_PATH_LEN];
198} diff_temp[2];
199
200static int count_lines(const char *data, int size)
201{
202 int count, ch, completely_empty = 1, nl_just_seen = 0;
203 count = 0;
204 while (0 < size--) {
205 ch = *data++;
206 if (ch == '\n') {
207 count++;
208 nl_just_seen = 1;
209 completely_empty = 0;
210 }
211 else {
212 nl_just_seen = 0;
213 completely_empty = 0;
214 }
215 }
216 if (completely_empty)
217 return 0;
218 if (!nl_just_seen)
219 count++; /* no trailing newline */
220 return count;
221}
222
223static void print_line_count(int count)
224{
225 switch (count) {
226 case 0:
227 printf("0,0");
228 break;
229 case 1:
230 printf("1");
231 break;
232 default:
233 printf("1,%d", count);
234 break;
235 }
236}
237
13e36ec5
JS
238static void copy_file(int prefix, const char *data, int size,
239 const char *set, const char *reset)
6973dcae
JH
240{
241 int ch, nl_just_seen = 1;
242 while (0 < size--) {
243 ch = *data++;
13e36ec5
JS
244 if (nl_just_seen) {
245 fputs(set, stdout);
6973dcae 246 putchar(prefix);
13e36ec5
JS
247 }
248 if (ch == '\n') {
6973dcae 249 nl_just_seen = 1;
13e36ec5
JS
250 fputs(reset, stdout);
251 } else
6973dcae 252 nl_just_seen = 0;
13e36ec5 253 putchar(ch);
6973dcae
JH
254 }
255 if (!nl_just_seen)
13e36ec5 256 printf("%s\n\\ No newline at end of file\n", reset);
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257}
258
259static void emit_rewrite_diff(const char *name_a,
260 const char *name_b,
261 struct diff_filespec *one,
13e36ec5
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262 struct diff_filespec *two,
263 int color_diff)
6973dcae
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264{
265 int lc_a, lc_b;
1a9eb3b9 266 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
267 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
268 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
269 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
270 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
271 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1a9eb3b9 272
8a13becc
JH
273 name_a += (*name_a == '/');
274 name_b += (*name_b == '/');
1a9eb3b9
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275 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
276 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
277
6973dcae
JH
278 diff_populate_filespec(one, 0);
279 diff_populate_filespec(two, 0);
280 lc_a = count_lines(one->data, one->size);
281 lc_b = count_lines(two->data, two->size);
13e36ec5
JS
282 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
283 metainfo, name_a, name_a_tab, reset,
284 metainfo, name_b, name_b_tab, reset, fraginfo);
6973dcae
JH
285 print_line_count(lc_a);
286 printf(" +");
287 print_line_count(lc_b);
13e36ec5 288 printf(" @@%s\n", reset);
6973dcae 289 if (lc_a)
13e36ec5 290 copy_file('-', one->data, one->size, old, reset);
6973dcae 291 if (lc_b)
13e36ec5 292 copy_file('+', two->data, two->size, new, reset);
6973dcae
JH
293}
294
295static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
296{
297 if (!DIFF_FILE_VALID(one)) {
d2543b8e 298 mf->ptr = (char *)""; /* does not matter */
6973dcae
JH
299 mf->size = 0;
300 return 0;
301 }
302 else if (diff_populate_filespec(one, 0))
303 return -1;
304 mf->ptr = one->data;
305 mf->size = one->size;
306 return 0;
307}
308
f59a59e2
JS
309struct diff_words_buffer {
310 mmfile_t text;
311 long alloc;
312 long current; /* output pointer */
313 int suppressed_newline;
314};
315
316static void diff_words_append(char *line, unsigned long len,
317 struct diff_words_buffer *buffer)
318{
319 if (buffer->text.size + len > buffer->alloc) {
320 buffer->alloc = (buffer->text.size + len) * 3 / 2;
321 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
322 }
323 line++;
324 len--;
325 memcpy(buffer->text.ptr + buffer->text.size, line, len);
326 buffer->text.size += len;
327}
328
329struct diff_words_data {
330 struct xdiff_emit_state xm;
331 struct diff_words_buffer minus, plus;
332};
333
334static void print_word(struct diff_words_buffer *buffer, int len, int color,
335 int suppress_newline)
336{
337 const char *ptr;
338 int eol = 0;
339
340 if (len == 0)
341 return;
342
343 ptr = buffer->text.ptr + buffer->current;
344 buffer->current += len;
345
346 if (ptr[len - 1] == '\n') {
347 eol = 1;
348 len--;
349 }
350
351 fputs(diff_get_color(1, color), stdout);
352 fwrite(ptr, len, 1, stdout);
353 fputs(diff_get_color(1, DIFF_RESET), stdout);
354
355 if (eol) {
356 if (suppress_newline)
357 buffer->suppressed_newline = 1;
358 else
359 putchar('\n');
360 }
361}
362
363static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
364{
365 struct diff_words_data *diff_words = priv;
366
367 if (diff_words->minus.suppressed_newline) {
368 if (line[0] != '+')
369 putchar('\n');
370 diff_words->minus.suppressed_newline = 0;
371 }
372
373 len--;
374 switch (line[0]) {
375 case '-':
376 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
377 break;
378 case '+':
379 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
380 break;
381 case ' ':
382 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
383 diff_words->minus.current += len;
384 break;
385 }
386}
387
388/* this executes the word diff on the accumulated buffers */
389static void diff_words_show(struct diff_words_data *diff_words)
390{
391 xpparam_t xpp;
392 xdemitconf_t xecfg;
393 xdemitcb_t ecb;
394 mmfile_t minus, plus;
395 int i;
396
397 minus.size = diff_words->minus.text.size;
398 minus.ptr = xmalloc(minus.size);
399 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
400 for (i = 0; i < minus.size; i++)
401 if (isspace(minus.ptr[i]))
402 minus.ptr[i] = '\n';
403 diff_words->minus.current = 0;
404
405 plus.size = diff_words->plus.text.size;
406 plus.ptr = xmalloc(plus.size);
407 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
408 for (i = 0; i < plus.size; i++)
409 if (isspace(plus.ptr[i]))
410 plus.ptr[i] = '\n';
411 diff_words->plus.current = 0;
412
413 xpp.flags = XDF_NEED_MINIMAL;
414 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
415 xecfg.flags = 0;
416 ecb.outf = xdiff_outf;
417 ecb.priv = diff_words;
418 diff_words->xm.consume = fn_out_diff_words_aux;
419 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
420
421 free(minus.ptr);
422 free(plus.ptr);
423 diff_words->minus.text.size = diff_words->plus.text.size = 0;
424
425 if (diff_words->minus.suppressed_newline) {
426 putchar('\n');
427 diff_words->minus.suppressed_newline = 0;
428 }
429}
430
6973dcae 431struct emit_callback {
cd112cef
JS
432 struct xdiff_emit_state xm;
433 int nparents, color_diff;
6973dcae 434 const char **label_path;
f59a59e2 435 struct diff_words_data *diff_words;
34a5e1a2 436 int *found_changesp;
6973dcae
JH
437};
438
f59a59e2
JS
439static void free_diff_words_data(struct emit_callback *ecbdata)
440{
441 if (ecbdata->diff_words) {
442 /* flush buffers */
443 if (ecbdata->diff_words->minus.text.size ||
444 ecbdata->diff_words->plus.text.size)
445 diff_words_show(ecbdata->diff_words);
446
447 if (ecbdata->diff_words->minus.text.ptr)
448 free (ecbdata->diff_words->minus.text.ptr);
449 if (ecbdata->diff_words->plus.text.ptr)
450 free (ecbdata->diff_words->plus.text.ptr);
451 free(ecbdata->diff_words);
452 ecbdata->diff_words = NULL;
453 }
454}
455
ce436973 456const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
457{
458 if (diff_use_color)
50f575fc
LT
459 return diff_colors[ix];
460 return "";
cd112cef
JS
461}
462
448c3ef1
JH
463static void emit_line(const char *set, const char *reset, const char *line, int len)
464{
465 if (len > 0 && line[len-1] == '\n')
466 len--;
467 fputs(set, stdout);
468 fwrite(line, len, 1, stdout);
469 puts(reset);
470}
471
c5a8c3ec
JS
472static void emit_line_with_ws(int nparents,
473 const char *set, const char *reset, const char *ws,
474 const char *line, int len)
448c3ef1 475{
c5a8c3ec 476 int col0 = nparents;
448c3ef1
JH
477 int last_tab_in_indent = -1;
478 int last_space_in_indent = -1;
479 int i;
480 int tail = len;
481 int need_highlight_leading_space = 0;
448c3ef1
JH
482 /* The line is a newly added line. Does it have funny leading
483 * whitespaces? In indent, SP should never precede a TAB.
484 */
485 for (i = col0; i < len; i++) {
486 if (line[i] == '\t') {
487 last_tab_in_indent = i;
488 if (0 <= last_space_in_indent)
489 need_highlight_leading_space = 1;
490 }
491 else if (line[i] == ' ')
492 last_space_in_indent = i;
493 else
494 break;
495 }
496 fputs(set, stdout);
497 fwrite(line, col0, 1, stdout);
498 fputs(reset, stdout);
499 if (((i == len) || line[i] == '\n') && i != col0) {
500 /* The whole line was indent */
501 emit_line(ws, reset, line + col0, len - col0);
502 return;
503 }
504 i = col0;
505 if (need_highlight_leading_space) {
506 while (i < last_tab_in_indent) {
507 if (line[i] == ' ') {
508 fputs(ws, stdout);
509 putchar(' ');
510 fputs(reset, stdout);
511 }
512 else
513 putchar(line[i]);
514 i++;
515 }
516 }
517 tail = len - 1;
518 if (line[tail] == '\n' && i < tail)
519 tail--;
520 while (i < tail) {
521 if (!isspace(line[tail]))
522 break;
523 tail--;
524 }
525 if ((i < tail && line[tail + 1] != '\n')) {
526 /* This has whitespace between tail+1..len */
527 fputs(set, stdout);
528 fwrite(line + i, tail - i + 1, 1, stdout);
529 fputs(reset, stdout);
530 emit_line(ws, reset, line + tail + 1, len - tail - 1);
531 }
532 else
533 emit_line(set, reset, line + i, len - i);
534}
535
c5a8c3ec
JS
536static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
537{
538 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
539 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
540
541 if (!*ws)
542 emit_line(set, reset, line, len);
543 else
544 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
545 line, len);
546}
547
cd112cef 548static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
549{
550 int i;
448c3ef1 551 int color;
6973dcae 552 struct emit_callback *ecbdata = priv;
ce436973
JK
553 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
554 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 555
34a5e1a2
JS
556 *(ecbdata->found_changesp) = 1;
557
6973dcae 558 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
559 const char *name_a_tab, *name_b_tab;
560
561 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
562 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
563
564 printf("%s--- %s%s%s\n",
565 set, ecbdata->label_path[0], reset, name_a_tab);
566 printf("%s+++ %s%s%s\n",
567 set, ecbdata->label_path[1], reset, name_b_tab);
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JH
568 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
569 }
cd112cef
JS
570
571 /* This is not really necessary for now because
572 * this codepath only deals with two-way diffs.
573 */
574 for (i = 0; i < len && line[i] == '@'; i++)
575 ;
576 if (2 <= i && i < len && line[i] == ' ') {
577 ecbdata->nparents = i - 1;
448c3ef1
JH
578 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
579 reset, line, len);
580 return;
cd112cef 581 }
448c3ef1
JH
582
583 if (len < ecbdata->nparents) {
50f575fc 584 set = reset;
448c3ef1
JH
585 emit_line(reset, reset, line, len);
586 return;
cd112cef 587 }
448c3ef1
JH
588
589 color = DIFF_PLAIN;
590 if (ecbdata->diff_words && ecbdata->nparents != 1)
591 /* fall back to normal diff */
592 free_diff_words_data(ecbdata);
593 if (ecbdata->diff_words) {
594 if (line[0] == '-') {
595 diff_words_append(line, len,
596 &ecbdata->diff_words->minus);
597 return;
598 } else if (line[0] == '+') {
599 diff_words_append(line, len,
600 &ecbdata->diff_words->plus);
601 return;
602 }
603 if (ecbdata->diff_words->minus.text.size ||
604 ecbdata->diff_words->plus.text.size)
605 diff_words_show(ecbdata->diff_words);
606 line++;
50f575fc 607 len--;
448c3ef1
JH
608 emit_line(set, reset, line, len);
609 return;
610 }
611 for (i = 0; i < ecbdata->nparents && len; i++) {
612 if (line[i] == '-')
613 color = DIFF_FILE_OLD;
614 else if (line[i] == '+')
615 color = DIFF_FILE_NEW;
616 }
617
618 if (color != DIFF_FILE_NEW) {
619 emit_line(diff_get_color(ecbdata->color_diff, color),
620 reset, line, len);
621 return;
622 }
623 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
624}
625
626static char *pprint_rename(const char *a, const char *b)
627{
628 const char *old = a;
629 const char *new = b;
630 char *name = NULL;
631 int pfx_length, sfx_length;
632 int len_a = strlen(a);
633 int len_b = strlen(b);
e5bfbf9b
AJ
634 int qlen_a = quote_c_style(a, NULL, NULL, 0);
635 int qlen_b = quote_c_style(b, NULL, NULL, 0);
636
637 if (qlen_a || qlen_b) {
638 if (qlen_a) len_a = qlen_a;
639 if (qlen_b) len_b = qlen_b;
640 name = xmalloc( len_a + len_b + 5 );
641 if (qlen_a)
642 quote_c_style(a, name, NULL, 0);
643 else
644 memcpy(name, a, len_a);
645 memcpy(name + len_a, " => ", 4);
646 if (qlen_b)
647 quote_c_style(b, name + len_a + 4, NULL, 0);
648 else
649 memcpy(name + len_a + 4, b, len_b + 1);
650 return name;
651 }
6973dcae
JH
652
653 /* Find common prefix */
654 pfx_length = 0;
655 while (*old && *new && *old == *new) {
656 if (*old == '/')
657 pfx_length = old - a + 1;
658 old++;
659 new++;
660 }
661
662 /* Find common suffix */
663 old = a + len_a;
664 new = b + len_b;
665 sfx_length = 0;
666 while (a <= old && b <= new && *old == *new) {
667 if (*old == '/')
668 sfx_length = len_a - (old - a);
669 old--;
670 new--;
671 }
672
673 /*
674 * pfx{mid-a => mid-b}sfx
675 * {pfx-a => pfx-b}sfx
676 * pfx{sfx-a => sfx-b}
677 * name-a => name-b
678 */
679 if (pfx_length + sfx_length) {
cc908b82
JH
680 int a_midlen = len_a - pfx_length - sfx_length;
681 int b_midlen = len_b - pfx_length - sfx_length;
682 if (a_midlen < 0) a_midlen = 0;
683 if (b_midlen < 0) b_midlen = 0;
684
e3008464 685 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae
JH
686 sprintf(name, "%.*s{%.*s => %.*s}%s",
687 pfx_length, a,
cc908b82
JH
688 a_midlen, a + pfx_length,
689 b_midlen, b + pfx_length,
6973dcae
JH
690 a + len_a - sfx_length);
691 }
692 else {
693 name = xmalloc(len_a + len_b + 5);
694 sprintf(name, "%s => %s", a, b);
695 }
696 return name;
697}
698
699struct diffstat_t {
700 struct xdiff_emit_state xm;
701
702 int nr;
703 int alloc;
704 struct diffstat_file {
705 char *name;
706 unsigned is_unmerged:1;
707 unsigned is_binary:1;
708 unsigned is_renamed:1;
709 unsigned int added, deleted;
710 } **files;
711};
712
713static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
714 const char *name_a,
715 const char *name_b)
716{
717 struct diffstat_file *x;
718 x = xcalloc(sizeof (*x), 1);
719 if (diffstat->nr == diffstat->alloc) {
720 diffstat->alloc = alloc_nr(diffstat->alloc);
721 diffstat->files = xrealloc(diffstat->files,
722 diffstat->alloc * sizeof(x));
723 }
724 diffstat->files[diffstat->nr++] = x;
725 if (name_b) {
726 x->name = pprint_rename(name_a, name_b);
727 x->is_renamed = 1;
728 }
729 else
9befac47 730 x->name = xstrdup(name_a);
6973dcae
JH
731 return x;
732}
733
734static void diffstat_consume(void *priv, char *line, unsigned long len)
735{
736 struct diffstat_t *diffstat = priv;
737 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
738
739 if (line[0] == '+')
740 x->added++;
741 else if (line[0] == '-')
742 x->deleted++;
743}
744
698ce6f8 745const char mime_boundary_leader[] = "------------";
6973dcae 746
a2540023
JH
747static int scale_linear(int it, int width, int max_change)
748{
749 /*
3ed74e60
JS
750 * make sure that at least one '-' is printed if there were deletions,
751 * and likewise for '+'.
a2540023 752 */
3ed74e60
JS
753 if (max_change < 2)
754 return it;
755 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
756}
757
785f7432
JH
758static void show_name(const char *prefix, const char *name, int len,
759 const char *reset, const char *set)
a2540023 760{
785f7432 761 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
762}
763
785f7432 764static void show_graph(char ch, int cnt, const char *set, const char *reset)
a2540023
JH
765{
766 if (cnt <= 0)
767 return;
785f7432 768 printf("%s", set);
a2540023
JH
769 while (cnt--)
770 putchar(ch);
785f7432 771 printf("%s", reset);
a2540023
JH
772}
773
774static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 775{
6973dcae 776 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 777 int max_change = 0, max_len = 0;
6973dcae 778 int total_files = data->nr;
a2540023 779 int width, name_width;
785f7432 780 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
781
782 if (data->nr == 0)
783 return;
784
a2540023
JH
785 width = options->stat_width ? options->stat_width : 80;
786 name_width = options->stat_name_width ? options->stat_name_width : 50;
787
788 /* Sanity: give at least 5 columns to the graph,
789 * but leave at least 10 columns for the name.
790 */
791 if (width < name_width + 15) {
792 if (name_width <= 25)
793 width = name_width + 15;
794 else
795 name_width = width - 15;
796 }
797
798 /* Find the longest filename and max number of changes */
785f7432
JH
799 reset = diff_get_color(options->color_diff, DIFF_RESET);
800 set = diff_get_color(options->color_diff, DIFF_PLAIN);
801 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
802 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
803
6973dcae
JH
804 for (i = 0; i < data->nr; i++) {
805 struct diffstat_file *file = data->files[i];
a2540023
JH
806 int change = file->added + file->deleted;
807
e5bfbf9b
AJ
808 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
809 len = quote_c_style(file->name, NULL, NULL, 0);
810 if (len) {
811 char *qname = xmalloc(len + 1);
812 quote_c_style(file->name, qname, NULL, 0);
813 free(file->name);
814 file->name = qname;
815 }
a2540023 816 }
6973dcae
JH
817
818 len = strlen(file->name);
819 if (max_len < len)
820 max_len = len;
821
822 if (file->is_binary || file->is_unmerged)
823 continue;
a2540023
JH
824 if (max_change < change)
825 max_change = change;
6973dcae
JH
826 }
827
a2540023
JH
828 /* Compute the width of the graph part;
829 * 10 is for one blank at the beginning of the line plus
830 * " | count " between the name and the graph.
831 *
832 * From here on, name_width is the width of the name area,
833 * and width is the width of the graph area.
834 */
835 name_width = (name_width < max_len) ? name_width : max_len;
836 if (width < (name_width + 10) + max_change)
837 width = width - (name_width + 10);
838 else
839 width = max_change;
840
6973dcae 841 for (i = 0; i < data->nr; i++) {
d2543b8e 842 const char *prefix = "";
6973dcae
JH
843 char *name = data->files[i]->name;
844 int added = data->files[i]->added;
845 int deleted = data->files[i]->deleted;
a2540023 846 int name_len;
6973dcae
JH
847
848 /*
849 * "scale" the filename
850 */
a2540023
JH
851 len = name_width;
852 name_len = strlen(name);
853 if (name_width < name_len) {
6973dcae
JH
854 char *slash;
855 prefix = "...";
a2540023
JH
856 len -= 3;
857 name += name_len - len;
6973dcae
JH
858 slash = strchr(name, '/');
859 if (slash)
860 name = slash;
861 }
6973dcae
JH
862
863 if (data->files[i]->is_binary) {
785f7432 864 show_name(prefix, name, len, reset, set);
b1882587
AP
865 printf(" Bin ");
866 printf("%s%d%s", del_c, deleted, reset);
867 printf(" -> ");
868 printf("%s%d%s", add_c, added, reset);
869 printf(" bytes");
870 printf("\n");
6973dcae
JH
871 goto free_diffstat_file;
872 }
873 else if (data->files[i]->is_unmerged) {
785f7432 874 show_name(prefix, name, len, reset, set);
a2540023 875 printf(" Unmerged\n");
6973dcae
JH
876 goto free_diffstat_file;
877 }
878 else if (!data->files[i]->is_renamed &&
879 (added + deleted == 0)) {
880 total_files--;
881 goto free_diffstat_file;
882 }
883
a2540023
JH
884 /*
885 * scale the add/delete
886 */
6973dcae
JH
887 add = added;
888 del = deleted;
889 total = add + del;
890 adds += add;
891 dels += del;
892
a2540023 893 if (width <= max_change) {
a2540023 894 add = scale_linear(add, width, max_change);
3ed74e60
JS
895 del = scale_linear(del, width, max_change);
896 total = add + del;
6973dcae 897 }
785f7432 898 show_name(prefix, name, len, reset, set);
a2540023 899 printf("%5d ", added + deleted);
785f7432
JH
900 show_graph('+', add, add_c, reset);
901 show_graph('-', del, del_c, reset);
a2540023 902 putchar('\n');
6973dcae
JH
903 free_diffstat_file:
904 free(data->files[i]->name);
905 free(data->files[i]);
906 }
907 free(data->files);
785f7432
JH
908 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
909 set, total_files, adds, dels, reset);
6973dcae
JH
910}
911
ebd124c6
NP
912static void show_shortstats(struct diffstat_t* data)
913{
914 int i, adds = 0, dels = 0, total_files = data->nr;
915
916 if (data->nr == 0)
917 return;
918
919 for (i = 0; i < data->nr; i++) {
920 if (!data->files[i]->is_binary &&
921 !data->files[i]->is_unmerged) {
922 int added = data->files[i]->added;
923 int deleted= data->files[i]->deleted;
924 if (!data->files[i]->is_renamed &&
925 (added + deleted == 0)) {
926 total_files--;
927 } else {
928 adds += added;
929 dels += deleted;
930 }
931 }
932 free(data->files[i]->name);
933 free(data->files[i]);
934 }
935 free(data->files);
936
937 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
938 total_files, adds, dels);
939}
940
74e2abe5
JH
941static void show_numstat(struct diffstat_t* data, struct diff_options *options)
942{
943 int i;
944
945 for (i = 0; i < data->nr; i++) {
946 struct diffstat_file *file = data->files[i];
947
bfddbc5e
JH
948 if (file->is_binary)
949 printf("-\t-\t");
950 else
951 printf("%d\t%d\t", file->added, file->deleted);
e5bfbf9b 952 if (options->line_termination && !file->is_renamed &&
74e2abe5
JH
953 quote_c_style(file->name, NULL, NULL, 0))
954 quote_c_style(file->name, NULL, stdout, 0);
955 else
956 fputs(file->name, stdout);
957 putchar(options->line_termination);
958 }
959}
960
88246898
JS
961struct checkdiff_t {
962 struct xdiff_emit_state xm;
963 const char *filename;
c5a8c3ec 964 int lineno, color_diff;
88246898
JS
965};
966
967static void checkdiff_consume(void *priv, char *line, unsigned long len)
968{
969 struct checkdiff_t *data = priv;
c5a8c3ec
JS
970 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
971 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
972 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
88246898
JS
973
974 if (line[0] == '+') {
c5a8c3ec 975 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
88246898 976
88246898
JS
977 /* check space before tab */
978 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
979 if (line[i] == ' ')
980 spaces++;
981 if (line[i - 1] == '\t' && spaces)
c5a8c3ec 982 space_before_tab = 1;
88246898
JS
983
984 /* check white space at line end */
985 if (line[len - 1] == '\n')
986 len--;
987 if (isspace(line[len - 1]))
c5a8c3ec
JS
988 white_space_at_end = 1;
989
990 if (space_before_tab || white_space_at_end) {
991 printf("%s:%d: %s", data->filename, data->lineno, ws);
992 if (space_before_tab) {
993 printf("space before tab");
994 if (white_space_at_end)
995 putchar(',');
996 }
997 if (white_space_at_end)
998 printf("white space at end");
999 printf(":%s ", reset);
1000 emit_line_with_ws(1, set, reset, ws, line, len);
1001 }
e6d40d65
JS
1002
1003 data->lineno++;
88246898
JS
1004 } else if (line[0] == ' ')
1005 data->lineno++;
1006 else if (line[0] == '@') {
1007 char *plus = strchr(line, '+');
1008 if (plus)
9e848163 1009 data->lineno = strtol(plus, NULL, 10);
88246898
JS
1010 else
1011 die("invalid diff");
1012 }
1013}
1014
0660626c
JH
1015static unsigned char *deflate_it(char *data,
1016 unsigned long size,
1017 unsigned long *result_size)
051308f6 1018{
0660626c
JH
1019 int bound;
1020 unsigned char *deflated;
1021 z_stream stream;
1022
1023 memset(&stream, 0, sizeof(stream));
12f6c308 1024 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1025 bound = deflateBound(&stream, size);
1026 deflated = xmalloc(bound);
1027 stream.next_out = deflated;
1028 stream.avail_out = bound;
1029
1030 stream.next_in = (unsigned char *)data;
1031 stream.avail_in = size;
1032 while (deflate(&stream, Z_FINISH) == Z_OK)
1033 ; /* nothing */
1034 deflateEnd(&stream);
1035 *result_size = stream.total_out;
1036 return deflated;
051308f6
JH
1037}
1038
d4c452f0 1039static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
051308f6 1040{
0660626c
JH
1041 void *cp;
1042 void *delta;
1043 void *deflated;
1044 void *data;
1045 unsigned long orig_size;
1046 unsigned long delta_size;
1047 unsigned long deflate_size;
1048 unsigned long data_size;
051308f6 1049
0660626c
JH
1050 /* We could do deflated delta, or we could do just deflated two,
1051 * whichever is smaller.
051308f6 1052 */
0660626c
JH
1053 delta = NULL;
1054 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1055 if (one->size && two->size) {
1056 delta = diff_delta(one->ptr, one->size,
1057 two->ptr, two->size,
1058 &delta_size, deflate_size);
1059 if (delta) {
1060 void *to_free = delta;
1061 orig_size = delta_size;
1062 delta = deflate_it(delta, delta_size, &delta_size);
1063 free(to_free);
051308f6
JH
1064 }
1065 }
051308f6 1066
0660626c
JH
1067 if (delta && delta_size < deflate_size) {
1068 printf("delta %lu\n", orig_size);
1069 free(deflated);
1070 data = delta;
1071 data_size = delta_size;
1072 }
1073 else {
1074 printf("literal %lu\n", two->size);
1075 free(delta);
1076 data = deflated;
1077 data_size = deflate_size;
1078 }
051308f6 1079
0660626c
JH
1080 /* emit data encoded in base85 */
1081 cp = data;
1082 while (data_size) {
1083 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1084 char line[70];
0660626c 1085 data_size -= bytes;
051308f6
JH
1086 if (bytes <= 26)
1087 line[0] = bytes + 'A' - 1;
1088 else
1089 line[0] = bytes - 26 + 'a' - 1;
1090 encode_85(line + 1, cp, bytes);
1d7f171c 1091 cp = (char *) cp + bytes;
051308f6
JH
1092 puts(line);
1093 }
1094 printf("\n");
0660626c 1095 free(data);
051308f6
JH
1096}
1097
d4c452f0
JH
1098static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1099{
1100 printf("GIT binary patch\n");
1101 emit_binary_diff_body(one, two);
1102 emit_binary_diff_body(two, one);
1103}
1104
8c701249
JH
1105static void setup_diff_attr_check(struct git_attr_check *check)
1106{
1107 static struct git_attr *attr_diff;
1108
1109 if (!attr_diff)
1110 attr_diff = git_attr("diff", 4);
1111 check->attr = attr_diff;
1112}
1113
6973dcae 1114#define FIRST_FEW_BYTES 8000
8c701249 1115static int file_is_binary(struct diff_filespec *one)
6973dcae 1116{
8c701249
JH
1117 unsigned long sz;
1118 struct git_attr_check attr_diff_check;
1119
1120 setup_diff_attr_check(&attr_diff_check);
515106fa 1121 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
a5e92abd 1122 const char *value = attr_diff_check.value;
515106fa
JH
1123 if (ATTR_TRUE(value))
1124 return 0;
1125 else if (ATTR_FALSE(value))
1126 return 1;
515106fa 1127 }
40250af4 1128
8c701249
JH
1129 if (!one->data) {
1130 if (!DIFF_FILE_VALID(one))
1131 return 0;
1132 diff_populate_filespec(one, 0);
1133 }
1134 sz = one->size;
6973dcae
JH
1135 if (FIRST_FEW_BYTES < sz)
1136 sz = FIRST_FEW_BYTES;
8c701249 1137 return !!memchr(one->data, 0, sz);
6973dcae
JH
1138}
1139
1140static void builtin_diff(const char *name_a,
1141 const char *name_b,
1142 struct diff_filespec *one,
1143 struct diff_filespec *two,
1144 const char *xfrm_msg,
051308f6 1145 struct diff_options *o,
6973dcae
JH
1146 int complete_rewrite)
1147{
1148 mmfile_t mf1, mf2;
1149 const char *lbl[2];
1150 char *a_one, *b_two;
ce436973
JK
1151 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1152 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
6973dcae 1153
50892777
JH
1154 a_one = quote_two("a/", name_a + (*name_a == '/'));
1155 b_two = quote_two("b/", name_b + (*name_b == '/'));
6973dcae
JH
1156 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1157 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
50f575fc 1158 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1159 if (lbl[0][0] == '/') {
1160 /* /dev/null */
50f575fc
LT
1161 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1162 if (xfrm_msg && xfrm_msg[0])
1163 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1164 }
1165 else if (lbl[1][0] == '/') {
50f575fc
LT
1166 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1167 if (xfrm_msg && xfrm_msg[0])
1168 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1169 }
1170 else {
1171 if (one->mode != two->mode) {
50f575fc
LT
1172 printf("%sold mode %06o%s\n", set, one->mode, reset);
1173 printf("%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1174 }
50f575fc
LT
1175 if (xfrm_msg && xfrm_msg[0])
1176 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1177 /*
1178 * we do not run diff between different kind
1179 * of objects.
1180 */
1181 if ((one->mode ^ two->mode) & S_IFMT)
1182 goto free_ab_and_return;
1183 if (complete_rewrite) {
13e36ec5
JS
1184 emit_rewrite_diff(name_a, name_b, one, two,
1185 o->color_diff);
34a5e1a2 1186 o->found_changes = 1;
6973dcae
JH
1187 goto free_ab_and_return;
1188 }
1189 }
1190
1191 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1192 die("unable to read files to diff");
1193
8c701249 1194 if (!o->text && (file_is_binary(one) || file_is_binary(two))) {
0660626c
JH
1195 /* Quite common confusing case */
1196 if (mf1.size == mf2.size &&
1197 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1198 goto free_ab_and_return;
1199 if (o->binary)
051308f6
JH
1200 emit_binary_diff(&mf1, &mf2);
1201 else
1202 printf("Binary files %s and %s differ\n",
1203 lbl[0], lbl[1]);
34a5e1a2 1204 o->found_changes = 1;
051308f6 1205 }
6973dcae
JH
1206 else {
1207 /* Crazy xdl interfaces.. */
1208 const char *diffopts = getenv("GIT_DIFF_OPTS");
1209 xpparam_t xpp;
1210 xdemitconf_t xecfg;
1211 xdemitcb_t ecb;
1212 struct emit_callback ecbdata;
1213
cd112cef 1214 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1215 ecbdata.label_path = lbl;
cd112cef 1216 ecbdata.color_diff = o->color_diff;
34a5e1a2 1217 ecbdata.found_changesp = &o->found_changes;
0d21efa5 1218 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1219 xecfg.ctxlen = o->context;
6973dcae
JH
1220 xecfg.flags = XDL_EMIT_FUNCNAMES;
1221 if (!diffopts)
1222 ;
cc44c765 1223 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1224 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1225 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1226 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1227 ecb.outf = xdiff_outf;
6973dcae 1228 ecb.priv = &ecbdata;
cd112cef 1229 ecbdata.xm.consume = fn_out_consume;
f59a59e2
JS
1230 if (o->color_diff_words)
1231 ecbdata.diff_words =
1232 xcalloc(1, sizeof(struct diff_words_data));
6973dcae 1233 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
f59a59e2
JS
1234 if (o->color_diff_words)
1235 free_diff_words_data(&ecbdata);
6973dcae
JH
1236 }
1237
1238 free_ab_and_return:
1239 free(a_one);
1240 free(b_two);
1241 return;
1242}
1243
1244static void builtin_diffstat(const char *name_a, const char *name_b,
1245 struct diff_filespec *one,
1246 struct diff_filespec *two,
710158e3 1247 struct diffstat_t *diffstat,
0d21efa5 1248 struct diff_options *o,
710158e3 1249 int complete_rewrite)
6973dcae
JH
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 }
710158e3
JH
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 return;
1266 }
6973dcae
JH
1267 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1268 die("unable to read files to diff");
1269
8c701249 1270 if (file_is_binary(one) || file_is_binary(two)) {
6973dcae 1271 data->is_binary = 1;
b1882587
AP
1272 data->added = mf2.size;
1273 data->deleted = mf1.size;
1274 } else {
6973dcae
JH
1275 /* Crazy xdl interfaces.. */
1276 xpparam_t xpp;
1277 xdemitconf_t xecfg;
1278 xdemitcb_t ecb;
1279
0d21efa5 1280 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
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
88246898
JS
1289static void builtin_checkdiff(const char *name_a, const char *name_b,
1290 struct diff_filespec *one,
c5a8c3ec 1291 struct diff_filespec *two, struct diff_options *o)
88246898
JS
1292{
1293 mmfile_t mf1, mf2;
1294 struct checkdiff_t data;
1295
1296 if (!two)
1297 return;
1298
1299 memset(&data, 0, sizeof(data));
1300 data.xm.consume = checkdiff_consume;
1301 data.filename = name_b ? name_b : name_a;
1302 data.lineno = 0;
c5a8c3ec 1303 data.color_diff = o->color_diff;
88246898
JS
1304
1305 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1306 die("unable to read files to diff");
1307
8c701249 1308 if (file_is_binary(two))
88246898
JS
1309 return;
1310 else {
1311 /* Crazy xdl interfaces.. */
1312 xpparam_t xpp;
1313 xdemitconf_t xecfg;
1314 xdemitcb_t ecb;
1315
1316 xpp.flags = XDF_NEED_MINIMAL;
1317 xecfg.ctxlen = 0;
1318 xecfg.flags = 0;
1319 ecb.outf = xdiff_outf;
1320 ecb.priv = &data;
1321 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1322 }
1323}
1324
6973dcae
JH
1325struct diff_filespec *alloc_filespec(const char *path)
1326{
1327 int namelen = strlen(path);
1328 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1329
1330 memset(spec, 0, sizeof(*spec));
1331 spec->path = (char *)(spec + 1);
1332 memcpy(spec->path, path, namelen+1);
1333 return spec;
1334}
1335
1336void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1337 unsigned short mode)
1338{
1339 if (mode) {
1340 spec->mode = canon_mode(mode);
e702496e 1341 hashcpy(spec->sha1, sha1);
0bef57ee 1342 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1343 }
1344}
1345
1346/*
1347 * Given a name and sha1 pair, if the dircache tells us the file in
1348 * the work tree has that object contents, return true, so that
1349 * prepare_temp_file() does not have to inflate and extract.
1350 */
1510fea7 1351static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1352{
1353 struct cache_entry *ce;
1354 struct stat st;
1355 int pos, len;
1356
1357 /* We do not read the cache ourselves here, because the
1358 * benchmark with my previous version that always reads cache
1359 * shows that it makes things worse for diff-tree comparing
1360 * two linux-2.6 kernel trees in an already checked out work
1361 * tree. This is because most diff-tree comparisons deal with
1362 * only a small number of files, while reading the cache is
1363 * expensive for a large project, and its cost outweighs the
1364 * savings we get by not inflating the object to a temporary
1365 * file. Practically, this code only helps when we are used
1366 * by diff-cache --cached, which does read the cache before
1367 * calling us.
1368 */
1369 if (!active_cache)
1370 return 0;
1371
1510fea7
SP
1372 /* We want to avoid the working directory if our caller
1373 * doesn't need the data in a normal file, this system
1374 * is rather slow with its stat/open/mmap/close syscalls,
1375 * and the object is contained in a pack file. The pack
1376 * is probably already open and will be faster to obtain
1377 * the data through than the working directory. Loose
1378 * objects however would tend to be slower as they need
1379 * to be individually opened and inflated.
1380 */
5caf9232 1381 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1382 return 0;
1383
6973dcae
JH
1384 len = strlen(name);
1385 pos = cache_name_pos(name, len);
1386 if (pos < 0)
1387 return 0;
1388 ce = active_cache[pos];
1389 if ((lstat(name, &st) < 0) ||
1390 !S_ISREG(st.st_mode) || /* careful! */
1391 ce_match_stat(ce, &st, 0) ||
a89fccd2 1392 hashcmp(sha1, ce->sha1))
6973dcae
JH
1393 return 0;
1394 /* we return 1 only when we can stat, it is a regular file,
1395 * stat information matches, and sha1 recorded in the cache
1396 * matches. I.e. we know the file in the work tree really is
1397 * the same as the <name, sha1> pair.
1398 */
1399 return 1;
1400}
1401
1402static struct sha1_size_cache {
1403 unsigned char sha1[20];
1404 unsigned long size;
1405} **sha1_size_cache;
1406static int sha1_size_cache_nr, sha1_size_cache_alloc;
1407
1408static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1409 int find_only,
1410 unsigned long size)
1411{
1412 int first, last;
1413 struct sha1_size_cache *e;
1414
1415 first = 0;
1416 last = sha1_size_cache_nr;
1417 while (last > first) {
1418 int cmp, next = (last + first) >> 1;
1419 e = sha1_size_cache[next];
a89fccd2 1420 cmp = hashcmp(e->sha1, sha1);
6973dcae
JH
1421 if (!cmp)
1422 return e;
1423 if (cmp < 0) {
1424 last = next;
1425 continue;
1426 }
1427 first = next+1;
1428 }
1429 /* not found */
1430 if (find_only)
1431 return NULL;
1432 /* insert to make it at "first" */
1433 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1434 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1435 sha1_size_cache = xrealloc(sha1_size_cache,
1436 sha1_size_cache_alloc *
1437 sizeof(*sha1_size_cache));
1438 }
1439 sha1_size_cache_nr++;
1440 if (first < sha1_size_cache_nr)
1441 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1442 (sha1_size_cache_nr - first - 1) *
1443 sizeof(*sha1_size_cache));
1444 e = xmalloc(sizeof(struct sha1_size_cache));
1445 sha1_size_cache[first] = e;
e702496e 1446 hashcpy(e->sha1, sha1);
6973dcae
JH
1447 e->size = size;
1448 return e;
1449}
1450
3afaa72d
JH
1451static int populate_from_stdin(struct diff_filespec *s)
1452{
1453#define INCREMENT 1024
1454 char *buf;
1455 unsigned long size;
1456 int got;
1457
1458 size = 0;
1459 buf = NULL;
1460 while (1) {
1461 buf = xrealloc(buf, size + INCREMENT);
1462 got = xread(0, buf + size, INCREMENT);
1463 if (!got)
1464 break; /* EOF */
1465 if (got < 0)
1466 return error("error while reading from stdin %s",
1467 strerror(errno));
1468 size += got;
1469 }
1470 s->should_munmap = 0;
1471 s->data = buf;
1472 s->size = size;
1473 s->should_free = 1;
1474 return 0;
1475}
1476
04786756
LT
1477static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1478{
1479 int len;
1480 char *data = xmalloc(100);
1481 len = snprintf(data, 100,
1482 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1483 s->data = data;
1484 s->size = len;
1485 s->should_free = 1;
1486 if (size_only) {
1487 s->data = NULL;
1488 free(data);
1489 }
1490 return 0;
1491}
1492
6973dcae
JH
1493/*
1494 * While doing rename detection and pickaxe operation, we may need to
1495 * grab the data for the blob (or file) for our own in-core comparison.
1496 * diff_filespec has data and size fields for this purpose.
1497 */
1498int diff_populate_filespec(struct diff_filespec *s, int size_only)
1499{
1500 int err = 0;
1501 if (!DIFF_FILE_VALID(s))
1502 die("internal error: asking to populate invalid file.");
1503 if (S_ISDIR(s->mode))
1504 return -1;
1505
1506 if (!use_size_cache)
1507 size_only = 0;
1508
1509 if (s->data)
1510 return err;
04786756
LT
1511
1512 if (S_ISDIRLNK(s->mode))
1513 return diff_populate_gitlink(s, size_only);
1514
6973dcae 1515 if (!s->sha1_valid ||
1510fea7 1516 reuse_worktree_file(s->path, s->sha1, 0)) {
6973dcae
JH
1517 struct stat st;
1518 int fd;
6c510bee
LT
1519 char *buf;
1520 unsigned long size;
1521
3afaa72d
JH
1522 if (!strcmp(s->path, "-"))
1523 return populate_from_stdin(s);
1524
6973dcae
JH
1525 if (lstat(s->path, &st) < 0) {
1526 if (errno == ENOENT) {
1527 err_empty:
1528 err = -1;
1529 empty:
d2543b8e 1530 s->data = (char *)"";
6973dcae
JH
1531 s->size = 0;
1532 return err;
1533 }
1534 }
dc49cd76 1535 s->size = xsize_t(st.st_size);
6973dcae
JH
1536 if (!s->size)
1537 goto empty;
1538 if (size_only)
1539 return 0;
1540 if (S_ISLNK(st.st_mode)) {
1541 int ret;
1542 s->data = xmalloc(s->size);
1543 s->should_free = 1;
1544 ret = readlink(s->path, s->data, s->size);
1545 if (ret < 0) {
1546 free(s->data);
1547 goto err_empty;
1548 }
1549 return 0;
1550 }
1551 fd = open(s->path, O_RDONLY);
1552 if (fd < 0)
1553 goto err_empty;
c4712e45 1554 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1555 close(fd);
6973dcae 1556 s->should_munmap = 1;
6c510bee
LT
1557
1558 /*
1559 * Convert from working tree format to canonical git format
1560 */
6c510bee 1561 size = s->size;
ac78e548
AR
1562 buf = convert_to_git(s->path, s->data, &size);
1563 if (buf) {
6c510bee
LT
1564 munmap(s->data, s->size);
1565 s->should_munmap = 0;
1566 s->data = buf;
1567 s->size = size;
1568 s->should_free = 1;
1569 }
6973dcae
JH
1570 }
1571 else {
21666f1a 1572 enum object_type type;
6973dcae
JH
1573 struct sha1_size_cache *e;
1574
1575 if (size_only) {
1576 e = locate_size_cache(s->sha1, 1, 0);
1577 if (e) {
1578 s->size = e->size;
1579 return 0;
1580 }
21666f1a
NP
1581 type = sha1_object_info(s->sha1, &s->size);
1582 if (type < 0)
6973dcae
JH
1583 locate_size_cache(s->sha1, 0, s->size);
1584 }
1585 else {
21666f1a 1586 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1587 s->should_free = 1;
1588 }
1589 }
1590 return 0;
1591}
1592
1593void diff_free_filespec_data(struct diff_filespec *s)
1594{
1595 if (s->should_free)
1596 free(s->data);
1597 else if (s->should_munmap)
1598 munmap(s->data, s->size);
1599 s->should_free = s->should_munmap = 0;
1600 s->data = NULL;
1601 free(s->cnt_data);
1602 s->cnt_data = NULL;
1603}
1604
1605static void prep_temp_blob(struct diff_tempfile *temp,
1606 void *blob,
1607 unsigned long size,
1608 const unsigned char *sha1,
1609 int mode)
1610{
1611 int fd;
1612
1613 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1614 if (fd < 0)
1615 die("unable to create temp-file");
93822c22 1616 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1617 die("unable to write temp-file");
1618 close(fd);
1619 temp->name = temp->tmp_path;
1620 strcpy(temp->hex, sha1_to_hex(sha1));
1621 temp->hex[40] = 0;
1622 sprintf(temp->mode, "%06o", mode);
1623}
1624
1625static void prepare_temp_file(const char *name,
1626 struct diff_tempfile *temp,
1627 struct diff_filespec *one)
1628{
1629 if (!DIFF_FILE_VALID(one)) {
1630 not_a_valid_file:
1631 /* A '-' entry produces this for file-2, and
1632 * a '+' entry produces this for file-1.
1633 */
1634 temp->name = "/dev/null";
1635 strcpy(temp->hex, ".");
1636 strcpy(temp->mode, ".");
1637 return;
1638 }
1639
1640 if (!one->sha1_valid ||
1510fea7 1641 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1642 struct stat st;
1643 if (lstat(name, &st) < 0) {
1644 if (errno == ENOENT)
1645 goto not_a_valid_file;
1646 die("stat(%s): %s", name, strerror(errno));
1647 }
1648 if (S_ISLNK(st.st_mode)) {
1649 int ret;
1650 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1651 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1652 if (sizeof(buf) <= st.st_size)
1653 die("symlink too long: %s", name);
dc49cd76 1654 ret = readlink(name, buf, sz);
6973dcae
JH
1655 if (ret < 0)
1656 die("readlink(%s)", name);
dc49cd76 1657 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1658 (one->sha1_valid ?
1659 one->sha1 : null_sha1),
1660 (one->sha1_valid ?
1661 one->mode : S_IFLNK));
1662 }
1663 else {
1664 /* we can borrow from the file in the work tree */
1665 temp->name = name;
1666 if (!one->sha1_valid)
1667 strcpy(temp->hex, sha1_to_hex(null_sha1));
1668 else
1669 strcpy(temp->hex, sha1_to_hex(one->sha1));
1670 /* Even though we may sometimes borrow the
1671 * contents from the work tree, we always want
1672 * one->mode. mode is trustworthy even when
1673 * !(one->sha1_valid), as long as
1674 * DIFF_FILE_VALID(one).
1675 */
1676 sprintf(temp->mode, "%06o", one->mode);
1677 }
1678 return;
1679 }
1680 else {
1681 if (diff_populate_filespec(one, 0))
1682 die("cannot read data blob for %s", one->path);
1683 prep_temp_blob(temp, one->data, one->size,
1684 one->sha1, one->mode);
1685 }
1686}
1687
1688static void remove_tempfile(void)
1689{
1690 int i;
1691
1692 for (i = 0; i < 2; i++)
1693 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1694 unlink(diff_temp[i].name);
1695 diff_temp[i].name = NULL;
1696 }
1697}
1698
1699static void remove_tempfile_on_signal(int signo)
1700{
1701 remove_tempfile();
1702 signal(SIGINT, SIG_DFL);
1703 raise(signo);
1704}
1705
1706static int spawn_prog(const char *pgm, const char **arg)
1707{
1708 pid_t pid;
1709 int status;
1710
1711 fflush(NULL);
1712 pid = fork();
1713 if (pid < 0)
1714 die("unable to fork");
1715 if (!pid) {
1716 execvp(pgm, (char *const*) arg);
1717 exit(255);
1718 }
1719
1720 while (waitpid(pid, &status, 0) < 0) {
1721 if (errno == EINTR)
1722 continue;
1723 return -1;
1724 }
1725
1726 /* Earlier we did not check the exit status because
1727 * diff exits non-zero if files are different, and
1728 * we are not interested in knowing that. It was a
1729 * mistake which made it harder to quit a diff-*
1730 * session that uses the git-apply-patch-script as
1731 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1732 * should also exit non-zero only when it wants to
1733 * abort the entire diff-* session.
1734 */
1735 if (WIFEXITED(status) && !WEXITSTATUS(status))
1736 return 0;
1737 return -1;
1738}
1739
1740/* An external diff command takes:
1741 *
1742 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1743 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1744 *
1745 */
1746static void run_external_diff(const char *pgm,
1747 const char *name,
1748 const char *other,
1749 struct diff_filespec *one,
1750 struct diff_filespec *two,
1751 const char *xfrm_msg,
1752 int complete_rewrite)
1753{
1754 const char *spawn_arg[10];
1755 struct diff_tempfile *temp = diff_temp;
1756 int retval;
1757 static int atexit_asked = 0;
1758 const char *othername;
1759 const char **arg = &spawn_arg[0];
1760
1761 othername = (other? other : name);
1762 if (one && two) {
1763 prepare_temp_file(name, &temp[0], one);
1764 prepare_temp_file(othername, &temp[1], two);
1765 if (! atexit_asked &&
1766 (temp[0].name == temp[0].tmp_path ||
1767 temp[1].name == temp[1].tmp_path)) {
1768 atexit_asked = 1;
1769 atexit(remove_tempfile);
1770 }
1771 signal(SIGINT, remove_tempfile_on_signal);
1772 }
1773
1774 if (one && two) {
1775 *arg++ = pgm;
1776 *arg++ = name;
1777 *arg++ = temp[0].name;
1778 *arg++ = temp[0].hex;
1779 *arg++ = temp[0].mode;
1780 *arg++ = temp[1].name;
1781 *arg++ = temp[1].hex;
1782 *arg++ = temp[1].mode;
1783 if (other) {
1784 *arg++ = other;
1785 *arg++ = xfrm_msg;
1786 }
1787 } else {
1788 *arg++ = pgm;
1789 *arg++ = name;
1790 }
1791 *arg = NULL;
1792 retval = spawn_prog(pgm, spawn_arg);
1793 remove_tempfile();
1794 if (retval) {
1795 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1796 exit(1);
1797 }
1798}
1799
f1af60bd
JH
1800static const char *external_diff_attr(const char *name)
1801{
1802 struct git_attr_check attr_diff_check;
1803
1804 setup_diff_attr_check(&attr_diff_check);
1805 if (!git_checkattr(name, 1, &attr_diff_check)) {
1806 const char *value = attr_diff_check.value;
1807 if (!ATTR_TRUE(value) &&
1808 !ATTR_FALSE(value) &&
1809 !ATTR_UNSET(value)) {
1810 struct ll_diff_driver *drv;
1811
1812 if (!user_diff_tail) {
1813 user_diff_tail = &user_diff;
1814 git_config(git_diff_ui_config);
1815 }
1816 for (drv = user_diff; drv; drv = drv->next)
1817 if (!strcmp(drv->name, value))
1818 return drv->cmd;
1819 }
1820 }
1821 return NULL;
1822}
1823
6973dcae
JH
1824static void run_diff_cmd(const char *pgm,
1825 const char *name,
1826 const char *other,
1827 struct diff_filespec *one,
1828 struct diff_filespec *two,
1829 const char *xfrm_msg,
051308f6 1830 struct diff_options *o,
6973dcae
JH
1831 int complete_rewrite)
1832{
f1af60bd
JH
1833 if (!o->allow_external)
1834 pgm = NULL;
1835 else {
1836 const char *cmd = external_diff_attr(name);
1837 if (cmd)
1838 pgm = cmd;
1839 }
1840
6973dcae
JH
1841 if (pgm) {
1842 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1843 complete_rewrite);
1844 return;
1845 }
1846 if (one && two)
1847 builtin_diff(name, other ? other : name,
051308f6 1848 one, two, xfrm_msg, o, complete_rewrite);
6973dcae
JH
1849 else
1850 printf("* Unmerged path %s\n", name);
1851}
1852
1853static void diff_fill_sha1_info(struct diff_filespec *one)
1854{
1855 if (DIFF_FILE_VALID(one)) {
1856 if (!one->sha1_valid) {
1857 struct stat st;
5332b2af
JS
1858 if (!strcmp(one->path, "-")) {
1859 hashcpy(one->sha1, null_sha1);
1860 return;
1861 }
6973dcae
JH
1862 if (lstat(one->path, &st) < 0)
1863 die("stat %s", one->path);
1864 if (index_path(one->sha1, one->path, &st, 0))
1865 die("cannot hash %s\n", one->path);
1866 }
1867 }
1868 else
e702496e 1869 hashclr(one->sha1);
6973dcae
JH
1870}
1871
1872static void run_diff(struct diff_filepair *p, struct diff_options *o)
1873{
1874 const char *pgm = external_diff();
1875 char msg[PATH_MAX*2+300], *xfrm_msg;
1876 struct diff_filespec *one;
1877 struct diff_filespec *two;
1878 const char *name;
1879 const char *other;
1880 char *name_munged, *other_munged;
1881 int complete_rewrite = 0;
1882 int len;
1883
1884 if (DIFF_PAIR_UNMERGED(p)) {
1885 /* unmerged */
051308f6 1886 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
6973dcae
JH
1887 return;
1888 }
1889
1890 name = p->one->path;
1891 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1892 name_munged = quote_one(name);
1893 other_munged = quote_one(other);
1894 one = p->one; two = p->two;
1895
1896 diff_fill_sha1_info(one);
1897 diff_fill_sha1_info(two);
1898
1899 len = 0;
1900 switch (p->status) {
1901 case DIFF_STATUS_COPIED:
1902 len += snprintf(msg + len, sizeof(msg) - len,
1903 "similarity index %d%%\n"
1904 "copy from %s\n"
1905 "copy to %s\n",
1906 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1907 name_munged, other_munged);
1908 break;
1909 case DIFF_STATUS_RENAMED:
1910 len += snprintf(msg + len, sizeof(msg) - len,
1911 "similarity index %d%%\n"
1912 "rename from %s\n"
1913 "rename to %s\n",
1914 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1915 name_munged, other_munged);
1916 break;
1917 case DIFF_STATUS_MODIFIED:
1918 if (p->score) {
1919 len += snprintf(msg + len, sizeof(msg) - len,
1920 "dissimilarity index %d%%\n",
1921 (int)(0.5 + p->score *
1922 100.0/MAX_SCORE));
1923 complete_rewrite = 1;
1924 break;
1925 }
1926 /* fallthru */
1927 default:
1928 /* nothing */
1929 ;
1930 }
1931
a89fccd2 1932 if (hashcmp(one->sha1, two->sha1)) {
6973dcae 1933 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
6973dcae 1934
82793c55
JH
1935 if (o->binary) {
1936 mmfile_t mf;
8c701249
JH
1937 if ((!fill_mmfile(&mf, one) && file_is_binary(one)) ||
1938 (!fill_mmfile(&mf, two) && file_is_binary(two)))
82793c55
JH
1939 abbrev = 40;
1940 }
6973dcae
JH
1941 len += snprintf(msg + len, sizeof(msg) - len,
1942 "index %.*s..%.*s",
dcb3450f
LT
1943 abbrev, sha1_to_hex(one->sha1),
1944 abbrev, sha1_to_hex(two->sha1));
6973dcae
JH
1945 if (one->mode == two->mode)
1946 len += snprintf(msg + len, sizeof(msg) - len,
1947 " %06o", one->mode);
1948 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1949 }
1950
1951 if (len)
1952 msg[--len] = 0;
1953 xfrm_msg = len ? msg : NULL;
1954
1955 if (!pgm &&
1956 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1957 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1958 /* a filepair that changes between file and symlink
1959 * needs to be split into deletion and creation.
1960 */
1961 struct diff_filespec *null = alloc_filespec(two->path);
051308f6 1962 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
6973dcae
JH
1963 free(null);
1964 null = alloc_filespec(one->path);
051308f6 1965 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
6973dcae
JH
1966 free(null);
1967 }
1968 else
051308f6 1969 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
6973dcae
JH
1970 complete_rewrite);
1971
1972 free(name_munged);
1973 free(other_munged);
1974}
1975
1976static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1977 struct diffstat_t *diffstat)
1978{
1979 const char *name;
1980 const char *other;
710158e3 1981 int complete_rewrite = 0;
6973dcae
JH
1982
1983 if (DIFF_PAIR_UNMERGED(p)) {
1984 /* unmerged */
0d21efa5 1985 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
1986 return;
1987 }
1988
1989 name = p->one->path;
1990 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1991
1992 diff_fill_sha1_info(p->one);
1993 diff_fill_sha1_info(p->two);
1994
710158e3
JH
1995 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1996 complete_rewrite = 1;
0d21efa5 1997 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
1998}
1999
88246898
JS
2000static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2001{
2002 const char *name;
2003 const char *other;
2004
2005 if (DIFF_PAIR_UNMERGED(p)) {
2006 /* unmerged */
2007 return;
2008 }
2009
2010 name = p->one->path;
2011 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2012
2013 diff_fill_sha1_info(p->one);
2014 diff_fill_sha1_info(p->two);
2015
c5a8c3ec 2016 builtin_checkdiff(name, other, p->one, p->two, o);
88246898
JS
2017}
2018
6973dcae
JH
2019void diff_setup(struct diff_options *options)
2020{
2021 memset(options, 0, sizeof(*options));
6973dcae
JH
2022 options->line_termination = '\n';
2023 options->break_opt = -1;
2024 options->rename_limit = -1;
ee1e5412 2025 options->context = 3;
3969cf7d 2026 options->msg_sep = "";
6973dcae
JH
2027
2028 options->change = diff_change;
2029 options->add_remove = diff_addremove;
801235c5 2030 options->color_diff = diff_use_color_default;
b68ea12e 2031 options->detect_rename = diff_detect_rename_default;
6973dcae
JH
2032}
2033
2034int diff_setup_done(struct diff_options *options)
2035{
d7de00f7
TH
2036 int count = 0;
2037
2038 if (options->output_format & DIFF_FORMAT_NAME)
2039 count++;
2040 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2041 count++;
2042 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2043 count++;
2044 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2045 count++;
2046 if (count > 1)
2047 die("--name-only, --name-status, --check and -s are mutually exclusive");
2048
03b9d560
JH
2049 if (options->find_copies_harder)
2050 options->detect_rename = DIFF_DETECT_COPY;
2051
c6744349
TH
2052 if (options->output_format & (DIFF_FORMAT_NAME |
2053 DIFF_FORMAT_NAME_STATUS |
2054 DIFF_FORMAT_CHECKDIFF |
2055 DIFF_FORMAT_NO_OUTPUT))
2056 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2057 DIFF_FORMAT_NUMSTAT |
c6744349 2058 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2059 DIFF_FORMAT_SHORTSTAT |
c6744349
TH
2060 DIFF_FORMAT_SUMMARY |
2061 DIFF_FORMAT_PATCH);
2062
6973dcae
JH
2063 /*
2064 * These cases always need recursive; we do not drop caller-supplied
2065 * recursive bits for other formats here.
2066 */
c6744349 2067 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2068 DIFF_FORMAT_NUMSTAT |
c6744349 2069 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2070 DIFF_FORMAT_SHORTSTAT |
d7014dc0 2071 DIFF_FORMAT_SUMMARY |
c6744349 2072 DIFF_FORMAT_CHECKDIFF))
6973dcae 2073 options->recursive = 1;
5e363541 2074 /*
3969cf7d 2075 * Also pickaxe would not work very well if you do not say recursive
5e363541 2076 */
3969cf7d
JH
2077 if (options->pickaxe)
2078 options->recursive = 1;
5e363541 2079
6973dcae
JH
2080 if (options->detect_rename && options->rename_limit < 0)
2081 options->rename_limit = diff_rename_limit_default;
2082 if (options->setup & DIFF_SETUP_USE_CACHE) {
2083 if (!active_cache)
2084 /* read-cache does not die even when it fails
2085 * so it is safe for us to do this here. Also
2086 * it does not smudge active_cache or active_nr
2087 * when it fails, so we do not have to worry about
2088 * cleaning it up ourselves either.
2089 */
2090 read_cache();
2091 }
2092 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
2093 use_size_cache = 1;
2094 if (options->abbrev <= 0 || 40 < options->abbrev)
2095 options->abbrev = 40; /* full */
2096
68aacb2f
JH
2097 /*
2098 * It does not make sense to show the first hit we happened
2099 * to have found. It does not make sense not to return with
2100 * exit code in such a case either.
2101 */
2102 if (options->quiet) {
2103 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2104 options->exit_with_status = 1;
2105 }
2106
2107 /*
2108 * If we postprocess in diffcore, we cannot simply return
2109 * upon the first hit. We need to run diff as usual.
2110 */
2111 if (options->pickaxe || options->filter)
2112 options->quiet = 0;
2113
6973dcae
JH
2114 return 0;
2115}
2116
d2543b8e 2117static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2118{
2119 char c, *eq;
2120 int len;
2121
2122 if (*arg != '-')
2123 return 0;
2124 c = *++arg;
2125 if (!c)
2126 return 0;
2127 if (c == arg_short) {
2128 c = *++arg;
2129 if (!c)
2130 return 1;
2131 if (val && isdigit(c)) {
2132 char *end;
2133 int n = strtoul(arg, &end, 10);
2134 if (*end)
2135 return 0;
2136 *val = n;
2137 return 1;
2138 }
2139 return 0;
2140 }
2141 if (c != '-')
2142 return 0;
2143 arg++;
2144 eq = strchr(arg, '=');
2145 if (eq)
2146 len = eq - arg;
2147 else
2148 len = strlen(arg);
2149 if (!len || strncmp(arg, arg_long, len))
2150 return 0;
2151 if (eq) {
2152 int n;
2153 char *end;
2154 if (!isdigit(*++eq))
2155 return 0;
2156 n = strtoul(eq, &end, 10);
2157 if (*end)
2158 return 0;
2159 *val = n;
2160 }
2161 return 1;
2162}
2163
6973dcae
JH
2164int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2165{
2166 const char *arg = av[0];
2167 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2168 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2169 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2170 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2171 else if (!strcmp(arg, "--raw"))
2172 options->output_format |= DIFF_FORMAT_RAW;
6973dcae 2173 else if (!strcmp(arg, "--patch-with-raw")) {
c6744349 2174 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
6973dcae 2175 }
74e2abe5
JH
2176 else if (!strcmp(arg, "--numstat")) {
2177 options->output_format |= DIFF_FORMAT_NUMSTAT;
2178 }
ebd124c6
NP
2179 else if (!strcmp(arg, "--shortstat")) {
2180 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2181 }
cc44c765 2182 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2183 char *end;
2184 int width = options->stat_width;
2185 int name_width = options->stat_name_width;
2186 arg += 6;
2187 end = (char *)arg;
2188
2189 switch (*arg) {
2190 case '-':
cc44c765 2191 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2192 width = strtoul(arg + 7, &end, 10);
cc44c765 2193 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2194 name_width = strtoul(arg + 12, &end, 10);
2195 break;
2196 case '=':
2197 width = strtoul(arg+1, &end, 10);
2198 if (*end == ',')
2199 name_width = strtoul(end+1, &end, 10);
2200 }
2201
2202 /* Important! This checks all the error cases! */
2203 if (*end)
2204 return 0;
c6744349 2205 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2206 options->stat_name_width = name_width;
2207 options->stat_width = width;
a2540023 2208 }
88246898 2209 else if (!strcmp(arg, "--check"))
c6744349 2210 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4bbd261b 2211 else if (!strcmp(arg, "--summary"))
c6744349 2212 options->output_format |= DIFF_FORMAT_SUMMARY;
6973dcae 2213 else if (!strcmp(arg, "--patch-with-stat")) {
c6744349 2214 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
6973dcae
JH
2215 }
2216 else if (!strcmp(arg, "-z"))
2217 options->line_termination = 0;
cc44c765 2218 else if (!prefixcmp(arg, "-l"))
6973dcae
JH
2219 options->rename_limit = strtoul(arg+2, NULL, 10);
2220 else if (!strcmp(arg, "--full-index"))
2221 options->full_index = 1;
0660626c 2222 else if (!strcmp(arg, "--binary")) {
c6744349 2223 options->output_format |= DIFF_FORMAT_PATCH;
82793c55 2224 options->binary = 1;
0660626c 2225 }
63ac4501 2226 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
6d64ea96
SF
2227 options->text = 1;
2228 }
6973dcae 2229 else if (!strcmp(arg, "--name-only"))
c6744349 2230 options->output_format |= DIFF_FORMAT_NAME;
6973dcae 2231 else if (!strcmp(arg, "--name-status"))
c6744349 2232 options->output_format |= DIFF_FORMAT_NAME_STATUS;
6973dcae
JH
2233 else if (!strcmp(arg, "-R"))
2234 options->reverse_diff = 1;
cc44c765 2235 else if (!prefixcmp(arg, "-S"))
6973dcae 2236 options->pickaxe = arg + 2;
c6744349
TH
2237 else if (!strcmp(arg, "-s")) {
2238 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2239 }
cc44c765 2240 else if (!prefixcmp(arg, "-O"))
6973dcae 2241 options->orderfile = arg + 2;
cc44c765 2242 else if (!prefixcmp(arg, "--diff-filter="))
6973dcae
JH
2243 options->filter = arg + 14;
2244 else if (!strcmp(arg, "--pickaxe-all"))
2245 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2246 else if (!strcmp(arg, "--pickaxe-regex"))
2247 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
cc44c765 2248 else if (!prefixcmp(arg, "-B")) {
6973dcae
JH
2249 if ((options->break_opt =
2250 diff_scoreopt_parse(arg)) == -1)
2251 return -1;
2252 }
cc44c765 2253 else if (!prefixcmp(arg, "-M")) {
6973dcae
JH
2254 if ((options->rename_score =
2255 diff_scoreopt_parse(arg)) == -1)
2256 return -1;
2257 options->detect_rename = DIFF_DETECT_RENAME;
2258 }
cc44c765 2259 else if (!prefixcmp(arg, "-C")) {
6973dcae
JH
2260 if ((options->rename_score =
2261 diff_scoreopt_parse(arg)) == -1)
2262 return -1;
2263 options->detect_rename = DIFF_DETECT_COPY;
2264 }
2265 else if (!strcmp(arg, "--find-copies-harder"))
2266 options->find_copies_harder = 1;
2267 else if (!strcmp(arg, "--abbrev"))
2268 options->abbrev = DEFAULT_ABBREV;
cc44c765 2269 else if (!prefixcmp(arg, "--abbrev=")) {
6973dcae
JH
2270 options->abbrev = strtoul(arg + 9, NULL, 10);
2271 if (options->abbrev < MINIMUM_ABBREV)
2272 options->abbrev = MINIMUM_ABBREV;
2273 else if (40 < options->abbrev)
2274 options->abbrev = 40;
2275 }
cd112cef
JS
2276 else if (!strcmp(arg, "--color"))
2277 options->color_diff = 1;
fef88bb0
JH
2278 else if (!strcmp(arg, "--no-color"))
2279 options->color_diff = 0;
0d21efa5
JS
2280 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2281 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2282 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2283 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
859f9c45
JS
2284 else if (!strcmp(arg, "--ignore-space-at-eol"))
2285 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
f59a59e2
JS
2286 else if (!strcmp(arg, "--color-words"))
2287 options->color_diff = options->color_diff_words = 1;
b68ea12e
EW
2288 else if (!strcmp(arg, "--no-renames"))
2289 options->detect_rename = 0;
41bbf9d5
AR
2290 else if (!strcmp(arg, "--exit-code"))
2291 options->exit_with_status = 1;
68aacb2f
JH
2292 else if (!strcmp(arg, "--quiet"))
2293 options->quiet = 1;
6973dcae
JH
2294 else
2295 return 0;
2296 return 1;
2297}
2298
2299static int parse_num(const char **cp_p)
2300{
2301 unsigned long num, scale;
2302 int ch, dot;
2303 const char *cp = *cp_p;
2304
2305 num = 0;
2306 scale = 1;
2307 dot = 0;
2308 for(;;) {
2309 ch = *cp;
2310 if ( !dot && ch == '.' ) {
2311 scale = 1;
2312 dot = 1;
2313 } else if ( ch == '%' ) {
2314 scale = dot ? scale*100 : 100;
2315 cp++; /* % is always at the end */
2316 break;
2317 } else if ( ch >= '0' && ch <= '9' ) {
2318 if ( scale < 100000 ) {
2319 scale *= 10;
2320 num = (num*10) + (ch-'0');
2321 }
2322 } else {
2323 break;
2324 }
2325 cp++;
2326 }
2327 *cp_p = cp;
2328
2329 /* user says num divided by scale and we say internally that
2330 * is MAX_SCORE * num / scale.
2331 */
dc49cd76 2332 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2333}
2334
2335int diff_scoreopt_parse(const char *opt)
2336{
2337 int opt1, opt2, cmd;
2338
2339 if (*opt++ != '-')
2340 return -1;
2341 cmd = *opt++;
2342 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2343 return -1; /* that is not a -M, -C nor -B option */
2344
2345 opt1 = parse_num(&opt);
2346 if (cmd != 'B')
2347 opt2 = 0;
2348 else {
2349 if (*opt == 0)
2350 opt2 = 0;
2351 else if (*opt != '/')
2352 return -1; /* we expect -B80/99 or -B80 */
2353 else {
2354 opt++;
2355 opt2 = parse_num(&opt);
2356 }
2357 }
2358 if (*opt != 0)
2359 return -1;
2360 return opt1 | (opt2 << 16);
2361}
2362
2363struct diff_queue_struct diff_queued_diff;
2364
2365void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2366{
2367 if (queue->alloc <= queue->nr) {
2368 queue->alloc = alloc_nr(queue->alloc);
2369 queue->queue = xrealloc(queue->queue,
2370 sizeof(dp) * queue->alloc);
2371 }
2372 queue->queue[queue->nr++] = dp;
2373}
2374
2375struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2376 struct diff_filespec *one,
2377 struct diff_filespec *two)
2378{
ef677686 2379 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2380 dp->one = one;
2381 dp->two = two;
6973dcae
JH
2382 if (queue)
2383 diff_q(queue, dp);
2384 return dp;
2385}
2386
2387void diff_free_filepair(struct diff_filepair *p)
2388{
2389 diff_free_filespec_data(p->one);
2390 diff_free_filespec_data(p->two);
2391 free(p->one);
2392 free(p->two);
2393 free(p);
2394}
2395
2396/* This is different from find_unique_abbrev() in that
2397 * it stuffs the result with dots for alignment.
2398 */
2399const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2400{
2401 int abblen;
2402 const char *abbrev;
2403 if (len == 40)
2404 return sha1_to_hex(sha1);
2405
2406 abbrev = find_unique_abbrev(sha1, len);
2407 if (!abbrev)
2408 return sha1_to_hex(sha1);
2409 abblen = strlen(abbrev);
2410 if (abblen < 37) {
2411 static char hex[41];
2412 if (len < abblen && abblen <= len + 2)
2413 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2414 else
2415 sprintf(hex, "%s...", abbrev);
2416 return hex;
2417 }
2418 return sha1_to_hex(sha1);
2419}
2420
2421static void diff_flush_raw(struct diff_filepair *p,
c6744349 2422 struct diff_options *options)
6973dcae
JH
2423{
2424 int two_paths;
2425 char status[10];
2426 int abbrev = options->abbrev;
2427 const char *path_one, *path_two;
c6744349
TH
2428 int inter_name_termination = '\t';
2429 int line_termination = options->line_termination;
2430
2431 if (!line_termination)
2432 inter_name_termination = 0;
6973dcae
JH
2433
2434 path_one = p->one->path;
2435 path_two = p->two->path;
2436 if (line_termination) {
2437 path_one = quote_one(path_one);
2438 path_two = quote_one(path_two);
2439 }
2440
2441 if (p->score)
2442 sprintf(status, "%c%03d", p->status,
2443 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2444 else {
2445 status[0] = p->status;
2446 status[1] = 0;
2447 }
2448 switch (p->status) {
2449 case DIFF_STATUS_COPIED:
2450 case DIFF_STATUS_RENAMED:
2451 two_paths = 1;
2452 break;
2453 case DIFF_STATUS_ADDED:
2454 case DIFF_STATUS_DELETED:
2455 two_paths = 0;
2456 break;
2457 default:
2458 two_paths = 0;
2459 break;
2460 }
c6744349 2461 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
6973dcae
JH
2462 printf(":%06o %06o %s ",
2463 p->one->mode, p->two->mode,
2464 diff_unique_abbrev(p->one->sha1, abbrev));
2465 printf("%s ",
2466 diff_unique_abbrev(p->two->sha1, abbrev));
2467 }
2468 printf("%s%c%s", status, inter_name_termination, path_one);
2469 if (two_paths)
2470 printf("%c%s", inter_name_termination, path_two);
2471 putchar(line_termination);
2472 if (path_one != p->one->path)
2473 free((void*)path_one);
2474 if (path_two != p->two->path)
2475 free((void*)path_two);
2476}
2477
471efb09 2478static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
6973dcae
JH
2479{
2480 char *path = p->two->path;
2481
471efb09 2482 if (opt->line_termination)
6973dcae 2483 path = quote_one(p->two->path);
471efb09 2484 printf("%s%c", path, opt->line_termination);
6973dcae
JH
2485 if (p->two->path != path)
2486 free(path);
2487}
2488
2489int diff_unmodified_pair(struct diff_filepair *p)
2490{
2491 /* This function is written stricter than necessary to support
2492 * the currently implemented transformers, but the idea is to
2493 * let transformers to produce diff_filepairs any way they want,
2494 * and filter and clean them up here before producing the output.
2495 */
2496 struct diff_filespec *one, *two;
2497
2498 if (DIFF_PAIR_UNMERGED(p))
2499 return 0; /* unmerged is interesting */
2500
2501 one = p->one;
2502 two = p->two;
2503
2504 /* deletion, addition, mode or type change
2505 * and rename are all interesting.
2506 */
2507 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2508 DIFF_PAIR_MODE_CHANGED(p) ||
2509 strcmp(one->path, two->path))
2510 return 0;
2511
2512 /* both are valid and point at the same path. that is, we are
2513 * dealing with a change.
2514 */
2515 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2516 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2517 return 1; /* no change */
2518 if (!one->sha1_valid && !two->sha1_valid)
2519 return 1; /* both look at the same file on the filesystem. */
2520 return 0;
2521}
2522
2523static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2524{
2525 if (diff_unmodified_pair(p))
2526 return;
2527
2528 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2529 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2530 return; /* no tree diffs in patch format */
2531
2532 run_diff(p, o);
2533}
2534
2535static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2536 struct diffstat_t *diffstat)
2537{
2538 if (diff_unmodified_pair(p))
2539 return;
2540
2541 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2542 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2543 return; /* no tree diffs in patch format */
2544
2545 run_diffstat(p, o, diffstat);
2546}
2547
88246898
JS
2548static void diff_flush_checkdiff(struct diff_filepair *p,
2549 struct diff_options *o)
2550{
2551 if (diff_unmodified_pair(p))
2552 return;
2553
2554 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2555 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2556 return; /* no tree diffs in patch format */
2557
2558 run_checkdiff(p, o);
2559}
2560
6973dcae
JH
2561int diff_queue_is_empty(void)
2562{
2563 struct diff_queue_struct *q = &diff_queued_diff;
2564 int i;
2565 for (i = 0; i < q->nr; i++)
2566 if (!diff_unmodified_pair(q->queue[i]))
2567 return 0;
2568 return 1;
2569}
2570
2571#if DIFF_DEBUG
2572void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2573{
2574 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2575 x, one ? one : "",
2576 s->path,
2577 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2578 s->mode,
2579 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2580 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2581 x, one ? one : "",
2582 s->size, s->xfrm_flags);
2583}
2584
2585void diff_debug_filepair(const struct diff_filepair *p, int i)
2586{
2587 diff_debug_filespec(p->one, i, "one");
2588 diff_debug_filespec(p->two, i, "two");
2589 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2590 p->score, p->status ? p->status : '?',
2591 p->source_stays, p->broken_pair);
2592}
2593
2594void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2595{
2596 int i;
2597 if (msg)
2598 fprintf(stderr, "%s\n", msg);
2599 fprintf(stderr, "q->nr = %d\n", q->nr);
2600 for (i = 0; i < q->nr; i++) {
2601 struct diff_filepair *p = q->queue[i];
2602 diff_debug_filepair(p, i);
2603 }
2604}
2605#endif
2606
2607static void diff_resolve_rename_copy(void)
2608{
2609 int i, j;
2610 struct diff_filepair *p, *pp;
2611 struct diff_queue_struct *q = &diff_queued_diff;
2612
2613 diff_debug_queue("resolve-rename-copy", q);
2614
2615 for (i = 0; i < q->nr; i++) {
2616 p = q->queue[i];
2617 p->status = 0; /* undecided */
2618 if (DIFF_PAIR_UNMERGED(p))
2619 p->status = DIFF_STATUS_UNMERGED;
2620 else if (!DIFF_FILE_VALID(p->one))
2621 p->status = DIFF_STATUS_ADDED;
2622 else if (!DIFF_FILE_VALID(p->two))
2623 p->status = DIFF_STATUS_DELETED;
2624 else if (DIFF_PAIR_TYPE_CHANGED(p))
2625 p->status = DIFF_STATUS_TYPE_CHANGED;
2626
2627 /* from this point on, we are dealing with a pair
2628 * whose both sides are valid and of the same type, i.e.
2629 * either in-place edit or rename/copy edit.
2630 */
2631 else if (DIFF_PAIR_RENAME(p)) {
2632 if (p->source_stays) {
2633 p->status = DIFF_STATUS_COPIED;
2634 continue;
2635 }
2636 /* See if there is some other filepair that
2637 * copies from the same source as us. If so
2638 * we are a copy. Otherwise we are either a
2639 * copy if the path stays, or a rename if it
2640 * does not, but we already handled "stays" case.
2641 */
2642 for (j = i + 1; j < q->nr; j++) {
2643 pp = q->queue[j];
2644 if (strcmp(pp->one->path, p->one->path))
2645 continue; /* not us */
2646 if (!DIFF_PAIR_RENAME(pp))
2647 continue; /* not a rename/copy */
2648 /* pp is a rename/copy from the same source */
2649 p->status = DIFF_STATUS_COPIED;
2650 break;
2651 }
2652 if (!p->status)
2653 p->status = DIFF_STATUS_RENAMED;
2654 }
a89fccd2 2655 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2656 p->one->mode != p->two->mode ||
2657 is_null_sha1(p->one->sha1))
6973dcae
JH
2658 p->status = DIFF_STATUS_MODIFIED;
2659 else {
2660 /* This is a "no-change" entry and should not
2661 * happen anymore, but prepare for broken callers.
2662 */
2663 error("feeding unmodified %s to diffcore",
2664 p->one->path);
2665 p->status = DIFF_STATUS_UNKNOWN;
2666 }
2667 }
2668 diff_debug_queue("resolve-rename-copy done", q);
2669}
2670
c6744349 2671static int check_pair_status(struct diff_filepair *p)
6973dcae 2672{
6973dcae
JH
2673 switch (p->status) {
2674 case DIFF_STATUS_UNKNOWN:
c6744349 2675 return 0;
6973dcae
JH
2676 case 0:
2677 die("internal error in diff-resolve-rename-copy");
6973dcae 2678 default:
c6744349 2679 return 1;
6973dcae
JH
2680 }
2681}
2682
c6744349
TH
2683static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2684{
2685 int fmt = opt->output_format;
2686
2687 if (fmt & DIFF_FORMAT_CHECKDIFF)
2688 diff_flush_checkdiff(p, opt);
2689 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2690 diff_flush_raw(p, opt);
2691 else if (fmt & DIFF_FORMAT_NAME)
471efb09 2692 diff_flush_name(p, opt);
c6744349
TH
2693}
2694
4bbd261b
SE
2695static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2696{
0d26a64e 2697 char *name = quote_one(fs->path);
4bbd261b 2698 if (fs->mode)
0d26a64e 2699 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
4bbd261b 2700 else
0d26a64e
AJ
2701 printf(" %s %s\n", newdelete, name);
2702 free(name);
4bbd261b
SE
2703}
2704
2705
2706static void show_mode_change(struct diff_filepair *p, int show_name)
2707{
2708 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
0d26a64e
AJ
2709 if (show_name) {
2710 char *name = quote_one(p->two->path);
4bbd261b 2711 printf(" mode change %06o => %06o %s\n",
0d26a64e
AJ
2712 p->one->mode, p->two->mode, name);
2713 free(name);
2714 }
4bbd261b
SE
2715 else
2716 printf(" mode change %06o => %06o\n",
2717 p->one->mode, p->two->mode);
2718 }
2719}
2720
2721static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2722{
b9f44164 2723 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2724
b9f44164
AJ
2725 printf(" %s %s (%d%%)\n", renamecopy, names,
2726 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2727 free(names);
4bbd261b
SE
2728 show_mode_change(p, 0);
2729}
2730
2731static void diff_summary(struct diff_filepair *p)
2732{
2733 switch(p->status) {
2734 case DIFF_STATUS_DELETED:
2735 show_file_mode_name("delete", p->one);
2736 break;
2737 case DIFF_STATUS_ADDED:
2738 show_file_mode_name("create", p->two);
2739 break;
2740 case DIFF_STATUS_COPIED:
2741 show_rename_copy("copy", p);
2742 break;
2743 case DIFF_STATUS_RENAMED:
2744 show_rename_copy("rename", p);
2745 break;
2746 default:
2747 if (p->score) {
0d26a64e
AJ
2748 char *name = quote_one(p->two->path);
2749 printf(" rewrite %s (%d%%)\n", name,
4bbd261b 2750 (int)(0.5 + p->score * 100.0/MAX_SCORE));
0d26a64e 2751 free(name);
4bbd261b
SE
2752 show_mode_change(p, 0);
2753 } else show_mode_change(p, 1);
2754 break;
2755 }
2756}
2757
fcb3d0ad
JS
2758struct patch_id_t {
2759 struct xdiff_emit_state xm;
2760 SHA_CTX *ctx;
2761 int patchlen;
2762};
2763
2764static int remove_space(char *line, int len)
2765{
2766 int i;
2767 char *dst = line;
2768 unsigned char c;
2769
2770 for (i = 0; i < len; i++)
2771 if (!isspace((c = line[i])))
2772 *dst++ = c;
2773
2774 return dst - line;
2775}
2776
2777static void patch_id_consume(void *priv, char *line, unsigned long len)
2778{
2779 struct patch_id_t *data = priv;
2780 int new_len;
2781
2782 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 2783 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
2784 return;
2785
2786 new_len = remove_space(line, len);
2787
2788 SHA1_Update(data->ctx, line, new_len);
2789 data->patchlen += new_len;
2790}
2791
2792/* returns 0 upon success, and writes result into sha1 */
2793static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2794{
2795 struct diff_queue_struct *q = &diff_queued_diff;
2796 int i;
2797 SHA_CTX ctx;
2798 struct patch_id_t data;
2799 char buffer[PATH_MAX * 4 + 20];
2800
2801 SHA1_Init(&ctx);
2802 memset(&data, 0, sizeof(struct patch_id_t));
2803 data.ctx = &ctx;
2804 data.xm.consume = patch_id_consume;
2805
2806 for (i = 0; i < q->nr; i++) {
2807 xpparam_t xpp;
2808 xdemitconf_t xecfg;
2809 xdemitcb_t ecb;
2810 mmfile_t mf1, mf2;
2811 struct diff_filepair *p = q->queue[i];
2812 int len1, len2;
2813
2814 if (p->status == 0)
2815 return error("internal diff status error");
2816 if (p->status == DIFF_STATUS_UNKNOWN)
2817 continue;
2818 if (diff_unmodified_pair(p))
2819 continue;
2820 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2821 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2822 continue;
2823 if (DIFF_PAIR_UNMERGED(p))
2824 continue;
2825
2826 diff_fill_sha1_info(p->one);
2827 diff_fill_sha1_info(p->two);
2828 if (fill_mmfile(&mf1, p->one) < 0 ||
2829 fill_mmfile(&mf2, p->two) < 0)
2830 return error("unable to read files to diff");
2831
2832 /* Maybe hash p->two? into the patch id? */
8c701249 2833 if (file_is_binary(p->two))
fcb3d0ad
JS
2834 continue;
2835
2836 len1 = remove_space(p->one->path, strlen(p->one->path));
2837 len2 = remove_space(p->two->path, strlen(p->two->path));
2838 if (p->one->mode == 0)
2839 len1 = snprintf(buffer, sizeof(buffer),
2840 "diff--gita/%.*sb/%.*s"
2841 "newfilemode%06o"
2842 "---/dev/null"
2843 "+++b/%.*s",
2844 len1, p->one->path,
2845 len2, p->two->path,
2846 p->two->mode,
2847 len2, p->two->path);
2848 else if (p->two->mode == 0)
2849 len1 = snprintf(buffer, sizeof(buffer),
2850 "diff--gita/%.*sb/%.*s"
2851 "deletedfilemode%06o"
2852 "---a/%.*s"
2853 "+++/dev/null",
2854 len1, p->one->path,
2855 len2, p->two->path,
2856 p->one->mode,
2857 len1, p->one->path);
2858 else
2859 len1 = snprintf(buffer, sizeof(buffer),
2860 "diff--gita/%.*sb/%.*s"
2861 "---a/%.*s"
2862 "+++b/%.*s",
2863 len1, p->one->path,
2864 len2, p->two->path,
2865 len1, p->one->path,
2866 len2, p->two->path);
2867 SHA1_Update(&ctx, buffer, len1);
2868
2869 xpp.flags = XDF_NEED_MINIMAL;
2870 xecfg.ctxlen = 3;
9fdc3bb5 2871 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
2872 ecb.outf = xdiff_outf;
2873 ecb.priv = &data;
2874 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2875 }
2876
2877 SHA1_Final(sha1, &ctx);
2878 return 0;
2879}
2880
2881int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2882{
2883 struct diff_queue_struct *q = &diff_queued_diff;
2884 int i;
2885 int result = diff_get_patch_id(options, sha1);
2886
2887 for (i = 0; i < q->nr; i++)
2888 diff_free_filepair(q->queue[i]);
2889
2890 free(q->queue);
2891 q->queue = NULL;
2892 q->nr = q->alloc = 0;
2893
2894 return result;
2895}
2896
946c3784 2897static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 2898{
6973dcae 2899 int i;
6973dcae 2900
946c3784
TH
2901 for (i = 0; i < q->nr; i++) {
2902 const struct diff_filepair *p = q->queue[i];
2903
2904 switch (p->status) {
2905 case DIFF_STATUS_DELETED:
2906 case DIFF_STATUS_ADDED:
2907 case DIFF_STATUS_COPIED:
2908 case DIFF_STATUS_RENAMED:
2909 return 0;
2910 default:
2911 if (p->score)
2912 return 0;
2913 if (p->one->mode && p->two->mode &&
2914 p->one->mode != p->two->mode)
2915 return 0;
2916 break;
2917 }
6973dcae 2918 }
946c3784
TH
2919 return 1;
2920}
2921
6973dcae
JH
2922void diff_flush(struct diff_options *options)
2923{
2924 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 2925 int i, output_format = options->output_format;
946c3784 2926 int separator = 0;
6973dcae 2927
c6744349
TH
2928 /*
2929 * Order: raw, stat, summary, patch
2930 * or: name/name-status/checkdiff (other bits clear)
2931 */
946c3784
TH
2932 if (!q->nr)
2933 goto free_queue;
6973dcae 2934
c6744349
TH
2935 if (output_format & (DIFF_FORMAT_RAW |
2936 DIFF_FORMAT_NAME |
2937 DIFF_FORMAT_NAME_STATUS |
2938 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
2939 for (i = 0; i < q->nr; i++) {
2940 struct diff_filepair *p = q->queue[i];
c6744349
TH
2941 if (check_pair_status(p))
2942 flush_one_pair(p, options);
6973dcae 2943 }
946c3784 2944 separator++;
6973dcae 2945 }
c6744349 2946
ebd124c6 2947 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 2948 struct diffstat_t diffstat;
c6744349 2949
5e2b0636
TH
2950 memset(&diffstat, 0, sizeof(struct diffstat_t));
2951 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
2952 for (i = 0; i < q->nr; i++) {
2953 struct diff_filepair *p = q->queue[i];
c6744349 2954 if (check_pair_status(p))
5e2b0636 2955 diff_flush_stat(p, options, &diffstat);
6973dcae 2956 }
74e2abe5
JH
2957 if (output_format & DIFF_FORMAT_NUMSTAT)
2958 show_numstat(&diffstat, options);
2959 if (output_format & DIFF_FORMAT_DIFFSTAT)
2960 show_stats(&diffstat, options);
ebd124c6
NP
2961 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2962 show_shortstats(&diffstat);
3969cf7d 2963 separator++;
6973dcae
JH
2964 }
2965
946c3784 2966 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349
TH
2967 for (i = 0; i < q->nr; i++)
2968 diff_summary(q->queue[i]);
3969cf7d 2969 separator++;
6973dcae
JH
2970 }
2971
c6744349 2972 if (output_format & DIFF_FORMAT_PATCH) {
946c3784
TH
2973 if (separator) {
2974 if (options->stat_sep) {
2975 /* attach patch instead of inline */
c6744349 2976 fputs(options->stat_sep, stdout);
946c3784 2977 } else {
c6744349 2978 putchar(options->line_termination);
946c3784 2979 }
c6744349
TH
2980 }
2981
2982 for (i = 0; i < q->nr; i++) {
2983 struct diff_filepair *p = q->queue[i];
2984 if (check_pair_status(p))
2985 diff_flush_patch(p, options);
2986 }
4bbd261b
SE
2987 }
2988
04245581
JK
2989 if (output_format & DIFF_FORMAT_CALLBACK)
2990 options->format_callback(q, options, options->format_callback_data);
2991
c6744349
TH
2992 for (i = 0; i < q->nr; i++)
2993 diff_free_filepair(q->queue[i]);
946c3784 2994free_queue:
6973dcae
JH
2995 free(q->queue);
2996 q->queue = NULL;
2997 q->nr = q->alloc = 0;
2998}
2999
3000static void diffcore_apply_filter(const char *filter)
3001{
3002 int i;
3003 struct diff_queue_struct *q = &diff_queued_diff;
3004 struct diff_queue_struct outq;
3005 outq.queue = NULL;
3006 outq.nr = outq.alloc = 0;
3007
3008 if (!filter)
3009 return;
3010
3011 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3012 int found;
3013 for (i = found = 0; !found && i < q->nr; i++) {
3014 struct diff_filepair *p = q->queue[i];
3015 if (((p->status == DIFF_STATUS_MODIFIED) &&
3016 ((p->score &&
3017 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3018 (!p->score &&
3019 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3020 ((p->status != DIFF_STATUS_MODIFIED) &&
3021 strchr(filter, p->status)))
3022 found++;
3023 }
3024 if (found)
3025 return;
3026
3027 /* otherwise we will clear the whole queue
3028 * by copying the empty outq at the end of this
3029 * function, but first clear the current entries
3030 * in the queue.
3031 */
3032 for (i = 0; i < q->nr; i++)
3033 diff_free_filepair(q->queue[i]);
3034 }
3035 else {
3036 /* Only the matching ones */
3037 for (i = 0; i < q->nr; i++) {
3038 struct diff_filepair *p = q->queue[i];
3039
3040 if (((p->status == DIFF_STATUS_MODIFIED) &&
3041 ((p->score &&
3042 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3043 (!p->score &&
3044 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3045 ((p->status != DIFF_STATUS_MODIFIED) &&
3046 strchr(filter, p->status)))
3047 diff_q(&outq, p);
3048 else
3049 diff_free_filepair(p);
3050 }
3051 }
3052 free(q->queue);
3053 *q = outq;
3054}
3055
3056void diffcore_std(struct diff_options *options)
3057{
68aacb2f
JH
3058 if (options->quiet)
3059 return;
6973dcae
JH
3060 if (options->break_opt != -1)
3061 diffcore_break(options->break_opt);
3062 if (options->detect_rename)
3063 diffcore_rename(options);
3064 if (options->break_opt != -1)
3065 diffcore_merge_broken();
3066 if (options->pickaxe)
3067 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3068 if (options->orderfile)
3069 diffcore_order(options->orderfile);
3070 diff_resolve_rename_copy();
3071 diffcore_apply_filter(options->filter);
68aacb2f
JH
3072
3073 options->has_changes = !!diff_queued_diff.nr;
6973dcae
JH
3074}
3075
3076
6973dcae
JH
3077void diff_addremove(struct diff_options *options,
3078 int addremove, unsigned mode,
3079 const unsigned char *sha1,
3080 const char *base, const char *path)
3081{
3082 char concatpath[PATH_MAX];
3083 struct diff_filespec *one, *two;
3084
3085 /* This may look odd, but it is a preparation for
3086 * feeding "there are unchanged files which should
3087 * not produce diffs, but when you are doing copy
3088 * detection you would need them, so here they are"
3089 * entries to the diff-core. They will be prefixed
3090 * with something like '=' or '*' (I haven't decided
3091 * which but should not make any difference).
3092 * Feeding the same new and old to diff_change()
3093 * also has the same effect.
3094 * Before the final output happens, they are pruned after
3095 * merged into rename/copy pairs as appropriate.
3096 */
3097 if (options->reverse_diff)
3098 addremove = (addremove == '+' ? '-' :
3099 addremove == '-' ? '+' : addremove);
3100
3101 if (!path) path = "";
3102 sprintf(concatpath, "%s%s", base, path);
3103 one = alloc_filespec(concatpath);
3104 two = alloc_filespec(concatpath);
3105
3106 if (addremove != '+')
3107 fill_filespec(one, sha1, mode);
3108 if (addremove != '-')
3109 fill_filespec(two, sha1, mode);
3110
3111 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3112 options->has_changes = 1;
6973dcae
JH
3113}
3114
3115void diff_change(struct diff_options *options,
3116 unsigned old_mode, unsigned new_mode,
3117 const unsigned char *old_sha1,
3118 const unsigned char *new_sha1,
3119 const char *base, const char *path)
3120{
3121 char concatpath[PATH_MAX];
3122 struct diff_filespec *one, *two;
3123
3124 if (options->reverse_diff) {
3125 unsigned tmp;
3126 const unsigned char *tmp_c;
3127 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3128 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3129 }
3130 if (!path) path = "";
3131 sprintf(concatpath, "%s%s", base, path);
3132 one = alloc_filespec(concatpath);
3133 two = alloc_filespec(concatpath);
3134 fill_filespec(one, old_sha1, old_mode);
3135 fill_filespec(two, new_sha1, new_mode);
3136
3137 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3138 options->has_changes = 1;
6973dcae
JH
3139}
3140
3141void diff_unmerge(struct diff_options *options,
e9c84099
JH
3142 const char *path,
3143 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3144{
3145 struct diff_filespec *one, *two;
3146 one = alloc_filespec(path);
3147 two = alloc_filespec(path);
e9c84099
JH
3148 fill_filespec(one, sha1, mode);
3149 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3150}