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[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
96f1e58f 19static int diff_detect_rename_default;
801235c5 20static int diff_rename_limit_default = -1;
96f1e58f 21static int diff_use_color_default;
6973dcae 22
7c92fe0e 23static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 24 "\033[m", /* reset */
448c3ef1
JH
25 "", /* PLAIN (normal) */
26 "\033[1m", /* METAINFO (bold) */
27 "\033[36m", /* FRAGINFO (cyan) */
28 "\033[31m", /* OLD (red) */
29 "\033[32m", /* NEW (green) */
30 "\033[33m", /* COMMIT (yellow) */
31 "\033[41m", /* WHITESPACE (red background) */
cd112cef
JS
32};
33
801235c5
JH
34static int parse_diff_color_slot(const char *var, int ofs)
35{
36 if (!strcasecmp(var+ofs, "plain"))
37 return DIFF_PLAIN;
38 if (!strcasecmp(var+ofs, "meta"))
39 return DIFF_METAINFO;
40 if (!strcasecmp(var+ofs, "frag"))
41 return DIFF_FRAGINFO;
42 if (!strcasecmp(var+ofs, "old"))
43 return DIFF_FILE_OLD;
44 if (!strcasecmp(var+ofs, "new"))
45 return DIFF_FILE_NEW;
ce436973
JK
46 if (!strcasecmp(var+ofs, "commit"))
47 return DIFF_COMMIT;
448c3ef1
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48 if (!strcasecmp(var+ofs, "whitespace"))
49 return DIFF_WHITESPACE;
801235c5
JH
50 die("bad config variable '%s'", var);
51}
52
f1af60bd
JH
53static struct ll_diff_driver {
54 const char *name;
55 struct ll_diff_driver *next;
56 char *cmd;
57} *user_diff, **user_diff_tail;
58
59/*
60 * Currently there is only "diff.<drivername>.command" variable;
61 * because there are "diff.color.<slot>" variables, we are parsing
62 * this in a bit convoluted way to allow low level diff driver
63 * called "color".
64 */
65static int parse_lldiff_command(const char *var, const char *ep, const char *value)
66{
67 const char *name;
68 int namelen;
69 struct ll_diff_driver *drv;
70
71 name = var + 5;
72 namelen = ep - name;
73 for (drv = user_diff; drv; drv = drv->next)
74 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
75 break;
76 if (!drv) {
77 char *namebuf;
78 drv = xcalloc(1, sizeof(struct ll_diff_driver));
79 namebuf = xmalloc(namelen + 1);
80 memcpy(namebuf, name, namelen);
81 namebuf[namelen] = 0;
82 drv->name = namebuf;
83 drv->next = NULL;
84 if (!user_diff_tail)
85 user_diff_tail = &user_diff;
86 *user_diff_tail = drv;
87 user_diff_tail = &(drv->next);
88 }
89
90 if (!value)
91 return error("%s: lacks value", var);
92 drv->cmd = strdup(value);
93 return 0;
94}
95
83ad63cf
JH
96/*
97 * These are to give UI layer defaults.
98 * The core-level commands such as git-diff-files should
99 * never be affected by the setting of diff.renames
100 * the user happens to have in the configuration file.
101 */
102int git_diff_ui_config(const char *var, const char *value)
801235c5
JH
103{
104 if (!strcmp(var, "diff.renamelimit")) {
105 diff_rename_limit_default = git_config_int(var, value);
106 return 0;
107 }
a159ca0c 108 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
7c92fe0e 109 diff_use_color_default = git_config_colorbool(var, value);
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JH
110 return 0;
111 }
b68ea12e
EW
112 if (!strcmp(var, "diff.renames")) {
113 if (!value)
114 diff_detect_rename_default = DIFF_DETECT_RENAME;
115 else if (!strcasecmp(value, "copies") ||
116 !strcasecmp(value, "copy"))
117 diff_detect_rename_default = DIFF_DETECT_COPY;
118 else if (git_config_bool(var,value))
119 diff_detect_rename_default = DIFF_DETECT_RENAME;
120 return 0;
121 }
f1af60bd
JH
122 if (!prefixcmp(var, "diff.")) {
123 const char *ep = strrchr(var, '.');
124
125 if (ep != var + 4 && !strcmp(ep, ".command"))
126 return parse_lldiff_command(var, ep, value);
127 }
1968d77d 128 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 129 int slot = parse_diff_color_slot(var, 11);
7c92fe0e 130 color_parse(value, var, diff_colors[slot]);
801235c5
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131 return 0;
132 }
f1af60bd 133
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134 return git_default_config(var, value);
135}
136
6973dcae
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137static char *quote_one(const char *str)
138{
139 int needlen;
140 char *xp;
141
142 if (!str)
143 return NULL;
144 needlen = quote_c_style(str, NULL, NULL, 0);
145 if (!needlen)
9befac47 146 return xstrdup(str);
6973dcae
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147 xp = xmalloc(needlen + 1);
148 quote_c_style(str, xp, NULL, 0);
149 return xp;
150}
151
152static char *quote_two(const char *one, const char *two)
153{
154 int need_one = quote_c_style(one, NULL, NULL, 1);
155 int need_two = quote_c_style(two, NULL, NULL, 1);
156 char *xp;
157
158 if (need_one + need_two) {
159 if (!need_one) need_one = strlen(one);
160 if (!need_two) need_one = strlen(two);
161
162 xp = xmalloc(need_one + need_two + 3);
163 xp[0] = '"';
164 quote_c_style(one, xp + 1, NULL, 1);
165 quote_c_style(two, xp + need_one + 1, NULL, 1);
166 strcpy(xp + need_one + need_two + 1, "\"");
167 return xp;
168 }
169 need_one = strlen(one);
170 need_two = strlen(two);
171 xp = xmalloc(need_one + need_two + 1);
172 strcpy(xp, one);
173 strcpy(xp + need_one, two);
174 return xp;
175}
176
177static const char *external_diff(void)
178{
179 static const char *external_diff_cmd = NULL;
180 static int done_preparing = 0;
181
182 if (done_preparing)
183 return external_diff_cmd;
184 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
185 done_preparing = 1;
186 return external_diff_cmd;
187}
188
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189static struct diff_tempfile {
190 const char *name; /* filename external diff should read from */
191 char hex[41];
192 char mode[10];
1472966c 193 char tmp_path[PATH_MAX];
6973dcae
JH
194} diff_temp[2];
195
196static int count_lines(const char *data, int size)
197{
198 int count, ch, completely_empty = 1, nl_just_seen = 0;
199 count = 0;
200 while (0 < size--) {
201 ch = *data++;
202 if (ch == '\n') {
203 count++;
204 nl_just_seen = 1;
205 completely_empty = 0;
206 }
207 else {
208 nl_just_seen = 0;
209 completely_empty = 0;
210 }
211 }
212 if (completely_empty)
213 return 0;
214 if (!nl_just_seen)
215 count++; /* no trailing newline */
216 return count;
217}
218
219static void print_line_count(int count)
220{
221 switch (count) {
222 case 0:
223 printf("0,0");
224 break;
225 case 1:
226 printf("1");
227 break;
228 default:
229 printf("1,%d", count);
230 break;
231 }
232}
233
13e36ec5
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234static void copy_file(int prefix, const char *data, int size,
235 const char *set, const char *reset)
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236{
237 int ch, nl_just_seen = 1;
238 while (0 < size--) {
239 ch = *data++;
13e36ec5
JS
240 if (nl_just_seen) {
241 fputs(set, stdout);
6973dcae 242 putchar(prefix);
13e36ec5
JS
243 }
244 if (ch == '\n') {
6973dcae 245 nl_just_seen = 1;
13e36ec5
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246 fputs(reset, stdout);
247 } else
6973dcae 248 nl_just_seen = 0;
13e36ec5 249 putchar(ch);
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250 }
251 if (!nl_just_seen)
13e36ec5 252 printf("%s\n\\ No newline at end of file\n", reset);
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253}
254
255static void emit_rewrite_diff(const char *name_a,
256 const char *name_b,
257 struct diff_filespec *one,
13e36ec5
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258 struct diff_filespec *two,
259 int color_diff)
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JH
260{
261 int lc_a, lc_b;
1a9eb3b9 262 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
263 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
264 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
265 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
266 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
267 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1a9eb3b9 268
8a13becc
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269 name_a += (*name_a == '/');
270 name_b += (*name_b == '/');
1a9eb3b9
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271 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
272 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
273
6973dcae
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274 diff_populate_filespec(one, 0);
275 diff_populate_filespec(two, 0);
276 lc_a = count_lines(one->data, one->size);
277 lc_b = count_lines(two->data, two->size);
13e36ec5
JS
278 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
279 metainfo, name_a, name_a_tab, reset,
280 metainfo, name_b, name_b_tab, reset, fraginfo);
6973dcae
JH
281 print_line_count(lc_a);
282 printf(" +");
283 print_line_count(lc_b);
13e36ec5 284 printf(" @@%s\n", reset);
6973dcae 285 if (lc_a)
13e36ec5 286 copy_file('-', one->data, one->size, old, reset);
6973dcae 287 if (lc_b)
13e36ec5 288 copy_file('+', two->data, two->size, new, reset);
6973dcae
JH
289}
290
291static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
292{
293 if (!DIFF_FILE_VALID(one)) {
d2543b8e 294 mf->ptr = (char *)""; /* does not matter */
6973dcae
JH
295 mf->size = 0;
296 return 0;
297 }
298 else if (diff_populate_filespec(one, 0))
299 return -1;
300 mf->ptr = one->data;
301 mf->size = one->size;
302 return 0;
303}
304
f59a59e2
JS
305struct diff_words_buffer {
306 mmfile_t text;
307 long alloc;
308 long current; /* output pointer */
309 int suppressed_newline;
310};
311
312static void diff_words_append(char *line, unsigned long len,
313 struct diff_words_buffer *buffer)
314{
315 if (buffer->text.size + len > buffer->alloc) {
316 buffer->alloc = (buffer->text.size + len) * 3 / 2;
317 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
318 }
319 line++;
320 len--;
321 memcpy(buffer->text.ptr + buffer->text.size, line, len);
322 buffer->text.size += len;
323}
324
325struct diff_words_data {
326 struct xdiff_emit_state xm;
327 struct diff_words_buffer minus, plus;
328};
329
330static void print_word(struct diff_words_buffer *buffer, int len, int color,
331 int suppress_newline)
332{
333 const char *ptr;
334 int eol = 0;
335
336 if (len == 0)
337 return;
338
339 ptr = buffer->text.ptr + buffer->current;
340 buffer->current += len;
341
342 if (ptr[len - 1] == '\n') {
343 eol = 1;
344 len--;
345 }
346
347 fputs(diff_get_color(1, color), stdout);
348 fwrite(ptr, len, 1, stdout);
349 fputs(diff_get_color(1, DIFF_RESET), stdout);
350
351 if (eol) {
352 if (suppress_newline)
353 buffer->suppressed_newline = 1;
354 else
355 putchar('\n');
356 }
357}
358
359static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
360{
361 struct diff_words_data *diff_words = priv;
362
363 if (diff_words->minus.suppressed_newline) {
364 if (line[0] != '+')
365 putchar('\n');
366 diff_words->minus.suppressed_newline = 0;
367 }
368
369 len--;
370 switch (line[0]) {
371 case '-':
372 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
373 break;
374 case '+':
375 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
376 break;
377 case ' ':
378 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
379 diff_words->minus.current += len;
380 break;
381 }
382}
383
384/* this executes the word diff on the accumulated buffers */
385static void diff_words_show(struct diff_words_data *diff_words)
386{
387 xpparam_t xpp;
388 xdemitconf_t xecfg;
389 xdemitcb_t ecb;
390 mmfile_t minus, plus;
391 int i;
392
393 minus.size = diff_words->minus.text.size;
394 minus.ptr = xmalloc(minus.size);
395 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
396 for (i = 0; i < minus.size; i++)
397 if (isspace(minus.ptr[i]))
398 minus.ptr[i] = '\n';
399 diff_words->minus.current = 0;
400
401 plus.size = diff_words->plus.text.size;
402 plus.ptr = xmalloc(plus.size);
403 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
404 for (i = 0; i < plus.size; i++)
405 if (isspace(plus.ptr[i]))
406 plus.ptr[i] = '\n';
407 diff_words->plus.current = 0;
408
409 xpp.flags = XDF_NEED_MINIMAL;
410 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
411 xecfg.flags = 0;
412 ecb.outf = xdiff_outf;
413 ecb.priv = diff_words;
414 diff_words->xm.consume = fn_out_diff_words_aux;
415 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
416
417 free(minus.ptr);
418 free(plus.ptr);
419 diff_words->minus.text.size = diff_words->plus.text.size = 0;
420
421 if (diff_words->minus.suppressed_newline) {
422 putchar('\n');
423 diff_words->minus.suppressed_newline = 0;
424 }
425}
426
6973dcae 427struct emit_callback {
cd112cef
JS
428 struct xdiff_emit_state xm;
429 int nparents, color_diff;
6973dcae 430 const char **label_path;
f59a59e2 431 struct diff_words_data *diff_words;
34a5e1a2 432 int *found_changesp;
6973dcae
JH
433};
434
f59a59e2
JS
435static void free_diff_words_data(struct emit_callback *ecbdata)
436{
437 if (ecbdata->diff_words) {
438 /* flush buffers */
439 if (ecbdata->diff_words->minus.text.size ||
440 ecbdata->diff_words->plus.text.size)
441 diff_words_show(ecbdata->diff_words);
442
443 if (ecbdata->diff_words->minus.text.ptr)
444 free (ecbdata->diff_words->minus.text.ptr);
445 if (ecbdata->diff_words->plus.text.ptr)
446 free (ecbdata->diff_words->plus.text.ptr);
447 free(ecbdata->diff_words);
448 ecbdata->diff_words = NULL;
449 }
450}
451
ce436973 452const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
453{
454 if (diff_use_color)
50f575fc
LT
455 return diff_colors[ix];
456 return "";
cd112cef
JS
457}
458
448c3ef1
JH
459static void emit_line(const char *set, const char *reset, const char *line, int len)
460{
461 if (len > 0 && line[len-1] == '\n')
462 len--;
463 fputs(set, stdout);
464 fwrite(line, len, 1, stdout);
465 puts(reset);
466}
467
c5a8c3ec
JS
468static void emit_line_with_ws(int nparents,
469 const char *set, const char *reset, const char *ws,
470 const char *line, int len)
448c3ef1 471{
c5a8c3ec 472 int col0 = nparents;
448c3ef1
JH
473 int last_tab_in_indent = -1;
474 int last_space_in_indent = -1;
475 int i;
476 int tail = len;
477 int need_highlight_leading_space = 0;
448c3ef1
JH
478 /* The line is a newly added line. Does it have funny leading
479 * whitespaces? In indent, SP should never precede a TAB.
480 */
481 for (i = col0; i < len; i++) {
482 if (line[i] == '\t') {
483 last_tab_in_indent = i;
484 if (0 <= last_space_in_indent)
485 need_highlight_leading_space = 1;
486 }
487 else if (line[i] == ' ')
488 last_space_in_indent = i;
489 else
490 break;
491 }
492 fputs(set, stdout);
493 fwrite(line, col0, 1, stdout);
494 fputs(reset, stdout);
495 if (((i == len) || line[i] == '\n') && i != col0) {
496 /* The whole line was indent */
497 emit_line(ws, reset, line + col0, len - col0);
498 return;
499 }
500 i = col0;
501 if (need_highlight_leading_space) {
502 while (i < last_tab_in_indent) {
503 if (line[i] == ' ') {
504 fputs(ws, stdout);
505 putchar(' ');
506 fputs(reset, stdout);
507 }
508 else
509 putchar(line[i]);
510 i++;
511 }
512 }
513 tail = len - 1;
514 if (line[tail] == '\n' && i < tail)
515 tail--;
516 while (i < tail) {
517 if (!isspace(line[tail]))
518 break;
519 tail--;
520 }
521 if ((i < tail && line[tail + 1] != '\n')) {
522 /* This has whitespace between tail+1..len */
523 fputs(set, stdout);
524 fwrite(line + i, tail - i + 1, 1, stdout);
525 fputs(reset, stdout);
526 emit_line(ws, reset, line + tail + 1, len - tail - 1);
527 }
528 else
529 emit_line(set, reset, line + i, len - i);
530}
531
c5a8c3ec
JS
532static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
533{
534 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
535 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
536
537 if (!*ws)
538 emit_line(set, reset, line, len);
539 else
540 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
541 line, len);
542}
543
cd112cef 544static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
545{
546 int i;
448c3ef1 547 int color;
6973dcae 548 struct emit_callback *ecbdata = priv;
ce436973
JK
549 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
550 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 551
34a5e1a2
JS
552 *(ecbdata->found_changesp) = 1;
553
6973dcae 554 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
555 const char *name_a_tab, *name_b_tab;
556
557 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
558 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
559
560 printf("%s--- %s%s%s\n",
561 set, ecbdata->label_path[0], reset, name_a_tab);
562 printf("%s+++ %s%s%s\n",
563 set, ecbdata->label_path[1], reset, name_b_tab);
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JH
564 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
565 }
cd112cef
JS
566
567 /* This is not really necessary for now because
568 * this codepath only deals with two-way diffs.
569 */
570 for (i = 0; i < len && line[i] == '@'; i++)
571 ;
572 if (2 <= i && i < len && line[i] == ' ') {
573 ecbdata->nparents = i - 1;
448c3ef1
JH
574 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
575 reset, line, len);
576 return;
cd112cef 577 }
448c3ef1
JH
578
579 if (len < ecbdata->nparents) {
50f575fc 580 set = reset;
448c3ef1
JH
581 emit_line(reset, reset, line, len);
582 return;
cd112cef 583 }
448c3ef1
JH
584
585 color = DIFF_PLAIN;
586 if (ecbdata->diff_words && ecbdata->nparents != 1)
587 /* fall back to normal diff */
588 free_diff_words_data(ecbdata);
589 if (ecbdata->diff_words) {
590 if (line[0] == '-') {
591 diff_words_append(line, len,
592 &ecbdata->diff_words->minus);
593 return;
594 } else if (line[0] == '+') {
595 diff_words_append(line, len,
596 &ecbdata->diff_words->plus);
597 return;
598 }
599 if (ecbdata->diff_words->minus.text.size ||
600 ecbdata->diff_words->plus.text.size)
601 diff_words_show(ecbdata->diff_words);
602 line++;
50f575fc 603 len--;
448c3ef1
JH
604 emit_line(set, reset, line, len);
605 return;
606 }
607 for (i = 0; i < ecbdata->nparents && len; i++) {
608 if (line[i] == '-')
609 color = DIFF_FILE_OLD;
610 else if (line[i] == '+')
611 color = DIFF_FILE_NEW;
612 }
613
614 if (color != DIFF_FILE_NEW) {
615 emit_line(diff_get_color(ecbdata->color_diff, color),
616 reset, line, len);
617 return;
618 }
619 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
620}
621
622static char *pprint_rename(const char *a, const char *b)
623{
624 const char *old = a;
625 const char *new = b;
626 char *name = NULL;
627 int pfx_length, sfx_length;
628 int len_a = strlen(a);
629 int len_b = strlen(b);
e5bfbf9b
AJ
630 int qlen_a = quote_c_style(a, NULL, NULL, 0);
631 int qlen_b = quote_c_style(b, NULL, NULL, 0);
632
633 if (qlen_a || qlen_b) {
634 if (qlen_a) len_a = qlen_a;
635 if (qlen_b) len_b = qlen_b;
636 name = xmalloc( len_a + len_b + 5 );
637 if (qlen_a)
638 quote_c_style(a, name, NULL, 0);
639 else
640 memcpy(name, a, len_a);
641 memcpy(name + len_a, " => ", 4);
642 if (qlen_b)
643 quote_c_style(b, name + len_a + 4, NULL, 0);
644 else
645 memcpy(name + len_a + 4, b, len_b + 1);
646 return name;
647 }
6973dcae
JH
648
649 /* Find common prefix */
650 pfx_length = 0;
651 while (*old && *new && *old == *new) {
652 if (*old == '/')
653 pfx_length = old - a + 1;
654 old++;
655 new++;
656 }
657
658 /* Find common suffix */
659 old = a + len_a;
660 new = b + len_b;
661 sfx_length = 0;
662 while (a <= old && b <= new && *old == *new) {
663 if (*old == '/')
664 sfx_length = len_a - (old - a);
665 old--;
666 new--;
667 }
668
669 /*
670 * pfx{mid-a => mid-b}sfx
671 * {pfx-a => pfx-b}sfx
672 * pfx{sfx-a => sfx-b}
673 * name-a => name-b
674 */
675 if (pfx_length + sfx_length) {
cc908b82
JH
676 int a_midlen = len_a - pfx_length - sfx_length;
677 int b_midlen = len_b - pfx_length - sfx_length;
678 if (a_midlen < 0) a_midlen = 0;
679 if (b_midlen < 0) b_midlen = 0;
680
e3008464 681 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae
JH
682 sprintf(name, "%.*s{%.*s => %.*s}%s",
683 pfx_length, a,
cc908b82
JH
684 a_midlen, a + pfx_length,
685 b_midlen, b + pfx_length,
6973dcae
JH
686 a + len_a - sfx_length);
687 }
688 else {
689 name = xmalloc(len_a + len_b + 5);
690 sprintf(name, "%s => %s", a, b);
691 }
692 return name;
693}
694
695struct diffstat_t {
696 struct xdiff_emit_state xm;
697
698 int nr;
699 int alloc;
700 struct diffstat_file {
701 char *name;
702 unsigned is_unmerged:1;
703 unsigned is_binary:1;
704 unsigned is_renamed:1;
705 unsigned int added, deleted;
706 } **files;
707};
708
709static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
710 const char *name_a,
711 const char *name_b)
712{
713 struct diffstat_file *x;
714 x = xcalloc(sizeof (*x), 1);
715 if (diffstat->nr == diffstat->alloc) {
716 diffstat->alloc = alloc_nr(diffstat->alloc);
717 diffstat->files = xrealloc(diffstat->files,
718 diffstat->alloc * sizeof(x));
719 }
720 diffstat->files[diffstat->nr++] = x;
721 if (name_b) {
722 x->name = pprint_rename(name_a, name_b);
723 x->is_renamed = 1;
724 }
725 else
9befac47 726 x->name = xstrdup(name_a);
6973dcae
JH
727 return x;
728}
729
730static void diffstat_consume(void *priv, char *line, unsigned long len)
731{
732 struct diffstat_t *diffstat = priv;
733 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
734
735 if (line[0] == '+')
736 x->added++;
737 else if (line[0] == '-')
738 x->deleted++;
739}
740
698ce6f8 741const char mime_boundary_leader[] = "------------";
6973dcae 742
a2540023
JH
743static int scale_linear(int it, int width, int max_change)
744{
745 /*
3ed74e60
JS
746 * make sure that at least one '-' is printed if there were deletions,
747 * and likewise for '+'.
a2540023 748 */
3ed74e60
JS
749 if (max_change < 2)
750 return it;
751 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
752}
753
785f7432
JH
754static void show_name(const char *prefix, const char *name, int len,
755 const char *reset, const char *set)
a2540023 756{
785f7432 757 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
758}
759
785f7432 760static void show_graph(char ch, int cnt, const char *set, const char *reset)
a2540023
JH
761{
762 if (cnt <= 0)
763 return;
785f7432 764 printf("%s", set);
a2540023
JH
765 while (cnt--)
766 putchar(ch);
785f7432 767 printf("%s", reset);
a2540023
JH
768}
769
770static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 771{
6973dcae 772 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 773 int max_change = 0, max_len = 0;
6973dcae 774 int total_files = data->nr;
a2540023 775 int width, name_width;
785f7432 776 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
777
778 if (data->nr == 0)
779 return;
780
a2540023
JH
781 width = options->stat_width ? options->stat_width : 80;
782 name_width = options->stat_name_width ? options->stat_name_width : 50;
783
784 /* Sanity: give at least 5 columns to the graph,
785 * but leave at least 10 columns for the name.
786 */
787 if (width < name_width + 15) {
788 if (name_width <= 25)
789 width = name_width + 15;
790 else
791 name_width = width - 15;
792 }
793
794 /* Find the longest filename and max number of changes */
785f7432
JH
795 reset = diff_get_color(options->color_diff, DIFF_RESET);
796 set = diff_get_color(options->color_diff, DIFF_PLAIN);
797 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
798 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
799
6973dcae
JH
800 for (i = 0; i < data->nr; i++) {
801 struct diffstat_file *file = data->files[i];
a2540023
JH
802 int change = file->added + file->deleted;
803
e5bfbf9b
AJ
804 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
805 len = quote_c_style(file->name, NULL, NULL, 0);
806 if (len) {
807 char *qname = xmalloc(len + 1);
808 quote_c_style(file->name, qname, NULL, 0);
809 free(file->name);
810 file->name = qname;
811 }
a2540023 812 }
6973dcae
JH
813
814 len = strlen(file->name);
815 if (max_len < len)
816 max_len = len;
817
818 if (file->is_binary || file->is_unmerged)
819 continue;
a2540023
JH
820 if (max_change < change)
821 max_change = change;
6973dcae
JH
822 }
823
a2540023
JH
824 /* Compute the width of the graph part;
825 * 10 is for one blank at the beginning of the line plus
826 * " | count " between the name and the graph.
827 *
828 * From here on, name_width is the width of the name area,
829 * and width is the width of the graph area.
830 */
831 name_width = (name_width < max_len) ? name_width : max_len;
832 if (width < (name_width + 10) + max_change)
833 width = width - (name_width + 10);
834 else
835 width = max_change;
836
6973dcae 837 for (i = 0; i < data->nr; i++) {
d2543b8e 838 const char *prefix = "";
6973dcae
JH
839 char *name = data->files[i]->name;
840 int added = data->files[i]->added;
841 int deleted = data->files[i]->deleted;
a2540023 842 int name_len;
6973dcae
JH
843
844 /*
845 * "scale" the filename
846 */
a2540023
JH
847 len = name_width;
848 name_len = strlen(name);
849 if (name_width < name_len) {
6973dcae
JH
850 char *slash;
851 prefix = "...";
a2540023
JH
852 len -= 3;
853 name += name_len - len;
6973dcae
JH
854 slash = strchr(name, '/');
855 if (slash)
856 name = slash;
857 }
6973dcae
JH
858
859 if (data->files[i]->is_binary) {
785f7432 860 show_name(prefix, name, len, reset, set);
b1882587
AP
861 printf(" Bin ");
862 printf("%s%d%s", del_c, deleted, reset);
863 printf(" -> ");
864 printf("%s%d%s", add_c, added, reset);
865 printf(" bytes");
866 printf("\n");
6973dcae
JH
867 goto free_diffstat_file;
868 }
869 else if (data->files[i]->is_unmerged) {
785f7432 870 show_name(prefix, name, len, reset, set);
a2540023 871 printf(" Unmerged\n");
6973dcae
JH
872 goto free_diffstat_file;
873 }
874 else if (!data->files[i]->is_renamed &&
875 (added + deleted == 0)) {
876 total_files--;
877 goto free_diffstat_file;
878 }
879
a2540023
JH
880 /*
881 * scale the add/delete
882 */
6973dcae
JH
883 add = added;
884 del = deleted;
885 total = add + del;
886 adds += add;
887 dels += del;
888
a2540023 889 if (width <= max_change) {
a2540023 890 add = scale_linear(add, width, max_change);
3ed74e60
JS
891 del = scale_linear(del, width, max_change);
892 total = add + del;
6973dcae 893 }
785f7432 894 show_name(prefix, name, len, reset, set);
a2540023 895 printf("%5d ", added + deleted);
785f7432
JH
896 show_graph('+', add, add_c, reset);
897 show_graph('-', del, del_c, reset);
a2540023 898 putchar('\n');
6973dcae
JH
899 free_diffstat_file:
900 free(data->files[i]->name);
901 free(data->files[i]);
902 }
903 free(data->files);
785f7432
JH
904 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
905 set, total_files, adds, dels, reset);
6973dcae
JH
906}
907
ebd124c6
NP
908static void show_shortstats(struct diffstat_t* data)
909{
910 int i, adds = 0, dels = 0, total_files = data->nr;
911
912 if (data->nr == 0)
913 return;
914
915 for (i = 0; i < data->nr; i++) {
916 if (!data->files[i]->is_binary &&
917 !data->files[i]->is_unmerged) {
918 int added = data->files[i]->added;
919 int deleted= data->files[i]->deleted;
920 if (!data->files[i]->is_renamed &&
921 (added + deleted == 0)) {
922 total_files--;
923 } else {
924 adds += added;
925 dels += deleted;
926 }
927 }
928 free(data->files[i]->name);
929 free(data->files[i]);
930 }
931 free(data->files);
932
933 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
934 total_files, adds, dels);
935}
936
74e2abe5
JH
937static void show_numstat(struct diffstat_t* data, struct diff_options *options)
938{
939 int i;
940
941 for (i = 0; i < data->nr; i++) {
942 struct diffstat_file *file = data->files[i];
943
bfddbc5e
JH
944 if (file->is_binary)
945 printf("-\t-\t");
946 else
947 printf("%d\t%d\t", file->added, file->deleted);
e5bfbf9b 948 if (options->line_termination && !file->is_renamed &&
74e2abe5
JH
949 quote_c_style(file->name, NULL, NULL, 0))
950 quote_c_style(file->name, NULL, stdout, 0);
951 else
952 fputs(file->name, stdout);
953 putchar(options->line_termination);
954 }
955}
956
88246898
JS
957struct checkdiff_t {
958 struct xdiff_emit_state xm;
959 const char *filename;
c5a8c3ec 960 int lineno, color_diff;
88246898
JS
961};
962
963static void checkdiff_consume(void *priv, char *line, unsigned long len)
964{
965 struct checkdiff_t *data = priv;
c5a8c3ec
JS
966 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
967 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
968 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
88246898
JS
969
970 if (line[0] == '+') {
c5a8c3ec 971 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
88246898 972
88246898
JS
973 /* check space before tab */
974 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
975 if (line[i] == ' ')
976 spaces++;
977 if (line[i - 1] == '\t' && spaces)
c5a8c3ec 978 space_before_tab = 1;
88246898
JS
979
980 /* check white space at line end */
981 if (line[len - 1] == '\n')
982 len--;
983 if (isspace(line[len - 1]))
c5a8c3ec
JS
984 white_space_at_end = 1;
985
986 if (space_before_tab || white_space_at_end) {
987 printf("%s:%d: %s", data->filename, data->lineno, ws);
988 if (space_before_tab) {
989 printf("space before tab");
990 if (white_space_at_end)
991 putchar(',');
992 }
993 if (white_space_at_end)
994 printf("white space at end");
995 printf(":%s ", reset);
996 emit_line_with_ws(1, set, reset, ws, line, len);
997 }
e6d40d65
JS
998
999 data->lineno++;
88246898
JS
1000 } else if (line[0] == ' ')
1001 data->lineno++;
1002 else if (line[0] == '@') {
1003 char *plus = strchr(line, '+');
1004 if (plus)
9e848163 1005 data->lineno = strtol(plus, NULL, 10);
88246898
JS
1006 else
1007 die("invalid diff");
1008 }
1009}
1010
0660626c
JH
1011static unsigned char *deflate_it(char *data,
1012 unsigned long size,
1013 unsigned long *result_size)
051308f6 1014{
0660626c
JH
1015 int bound;
1016 unsigned char *deflated;
1017 z_stream stream;
1018
1019 memset(&stream, 0, sizeof(stream));
12f6c308 1020 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1021 bound = deflateBound(&stream, size);
1022 deflated = xmalloc(bound);
1023 stream.next_out = deflated;
1024 stream.avail_out = bound;
1025
1026 stream.next_in = (unsigned char *)data;
1027 stream.avail_in = size;
1028 while (deflate(&stream, Z_FINISH) == Z_OK)
1029 ; /* nothing */
1030 deflateEnd(&stream);
1031 *result_size = stream.total_out;
1032 return deflated;
051308f6
JH
1033}
1034
d4c452f0 1035static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
051308f6 1036{
0660626c
JH
1037 void *cp;
1038 void *delta;
1039 void *deflated;
1040 void *data;
1041 unsigned long orig_size;
1042 unsigned long delta_size;
1043 unsigned long deflate_size;
1044 unsigned long data_size;
051308f6 1045
0660626c
JH
1046 /* We could do deflated delta, or we could do just deflated two,
1047 * whichever is smaller.
051308f6 1048 */
0660626c
JH
1049 delta = NULL;
1050 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1051 if (one->size && two->size) {
1052 delta = diff_delta(one->ptr, one->size,
1053 two->ptr, two->size,
1054 &delta_size, deflate_size);
1055 if (delta) {
1056 void *to_free = delta;
1057 orig_size = delta_size;
1058 delta = deflate_it(delta, delta_size, &delta_size);
1059 free(to_free);
051308f6
JH
1060 }
1061 }
051308f6 1062
0660626c
JH
1063 if (delta && delta_size < deflate_size) {
1064 printf("delta %lu\n", orig_size);
1065 free(deflated);
1066 data = delta;
1067 data_size = delta_size;
1068 }
1069 else {
1070 printf("literal %lu\n", two->size);
1071 free(delta);
1072 data = deflated;
1073 data_size = deflate_size;
1074 }
051308f6 1075
0660626c
JH
1076 /* emit data encoded in base85 */
1077 cp = data;
1078 while (data_size) {
1079 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1080 char line[70];
0660626c 1081 data_size -= bytes;
051308f6
JH
1082 if (bytes <= 26)
1083 line[0] = bytes + 'A' - 1;
1084 else
1085 line[0] = bytes - 26 + 'a' - 1;
1086 encode_85(line + 1, cp, bytes);
1d7f171c 1087 cp = (char *) cp + bytes;
051308f6
JH
1088 puts(line);
1089 }
1090 printf("\n");
0660626c 1091 free(data);
051308f6
JH
1092}
1093
d4c452f0
JH
1094static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1095{
1096 printf("GIT binary patch\n");
1097 emit_binary_diff_body(one, two);
1098 emit_binary_diff_body(two, one);
1099}
1100
8c701249
JH
1101static void setup_diff_attr_check(struct git_attr_check *check)
1102{
1103 static struct git_attr *attr_diff;
1104
1105 if (!attr_diff)
1106 attr_diff = git_attr("diff", 4);
1107 check->attr = attr_diff;
1108}
1109
8c701249 1110static int file_is_binary(struct diff_filespec *one)
6973dcae 1111{
8c701249
JH
1112 struct git_attr_check attr_diff_check;
1113
1114 setup_diff_attr_check(&attr_diff_check);
515106fa 1115 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
a5e92abd 1116 const char *value = attr_diff_check.value;
515106fa
JH
1117 if (ATTR_TRUE(value))
1118 return 0;
1119 else if (ATTR_FALSE(value))
1120 return 1;
515106fa 1121 }
40250af4 1122
8c701249
JH
1123 if (!one->data) {
1124 if (!DIFF_FILE_VALID(one))
1125 return 0;
1126 diff_populate_filespec(one, 0);
1127 }
6bfce93e 1128 return buffer_is_binary(one->data, one->size);
6973dcae
JH
1129}
1130
1131static void builtin_diff(const char *name_a,
1132 const char *name_b,
1133 struct diff_filespec *one,
1134 struct diff_filespec *two,
1135 const char *xfrm_msg,
051308f6 1136 struct diff_options *o,
6973dcae
JH
1137 int complete_rewrite)
1138{
1139 mmfile_t mf1, mf2;
1140 const char *lbl[2];
1141 char *a_one, *b_two;
ce436973
JK
1142 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1143 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
6973dcae 1144
50892777
JH
1145 a_one = quote_two("a/", name_a + (*name_a == '/'));
1146 b_two = quote_two("b/", name_b + (*name_b == '/'));
6973dcae
JH
1147 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1148 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
50f575fc 1149 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1150 if (lbl[0][0] == '/') {
1151 /* /dev/null */
50f575fc
LT
1152 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1153 if (xfrm_msg && xfrm_msg[0])
1154 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1155 }
1156 else if (lbl[1][0] == '/') {
50f575fc
LT
1157 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1158 if (xfrm_msg && xfrm_msg[0])
1159 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1160 }
1161 else {
1162 if (one->mode != two->mode) {
50f575fc
LT
1163 printf("%sold mode %06o%s\n", set, one->mode, reset);
1164 printf("%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1165 }
50f575fc
LT
1166 if (xfrm_msg && xfrm_msg[0])
1167 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1168 /*
1169 * we do not run diff between different kind
1170 * of objects.
1171 */
1172 if ((one->mode ^ two->mode) & S_IFMT)
1173 goto free_ab_and_return;
1174 if (complete_rewrite) {
13e36ec5
JS
1175 emit_rewrite_diff(name_a, name_b, one, two,
1176 o->color_diff);
34a5e1a2 1177 o->found_changes = 1;
6973dcae
JH
1178 goto free_ab_and_return;
1179 }
1180 }
1181
1182 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1183 die("unable to read files to diff");
1184
8c701249 1185 if (!o->text && (file_is_binary(one) || file_is_binary(two))) {
0660626c
JH
1186 /* Quite common confusing case */
1187 if (mf1.size == mf2.size &&
1188 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1189 goto free_ab_and_return;
1190 if (o->binary)
051308f6
JH
1191 emit_binary_diff(&mf1, &mf2);
1192 else
1193 printf("Binary files %s and %s differ\n",
1194 lbl[0], lbl[1]);
34a5e1a2 1195 o->found_changes = 1;
051308f6 1196 }
6973dcae
JH
1197 else {
1198 /* Crazy xdl interfaces.. */
1199 const char *diffopts = getenv("GIT_DIFF_OPTS");
1200 xpparam_t xpp;
1201 xdemitconf_t xecfg;
1202 xdemitcb_t ecb;
1203 struct emit_callback ecbdata;
1204
cd112cef 1205 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1206 ecbdata.label_path = lbl;
cd112cef 1207 ecbdata.color_diff = o->color_diff;
34a5e1a2 1208 ecbdata.found_changesp = &o->found_changes;
0d21efa5 1209 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1210 xecfg.ctxlen = o->context;
6973dcae
JH
1211 xecfg.flags = XDL_EMIT_FUNCNAMES;
1212 if (!diffopts)
1213 ;
cc44c765 1214 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1215 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1216 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1217 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1218 ecb.outf = xdiff_outf;
6973dcae 1219 ecb.priv = &ecbdata;
cd112cef 1220 ecbdata.xm.consume = fn_out_consume;
f59a59e2
JS
1221 if (o->color_diff_words)
1222 ecbdata.diff_words =
1223 xcalloc(1, sizeof(struct diff_words_data));
6973dcae 1224 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
f59a59e2
JS
1225 if (o->color_diff_words)
1226 free_diff_words_data(&ecbdata);
6973dcae
JH
1227 }
1228
1229 free_ab_and_return:
fc3abdf5
JH
1230 diff_free_filespec_data(one);
1231 diff_free_filespec_data(two);
6973dcae
JH
1232 free(a_one);
1233 free(b_two);
1234 return;
1235}
1236
1237static void builtin_diffstat(const char *name_a, const char *name_b,
1238 struct diff_filespec *one,
1239 struct diff_filespec *two,
710158e3 1240 struct diffstat_t *diffstat,
0d21efa5 1241 struct diff_options *o,
710158e3 1242 int complete_rewrite)
6973dcae
JH
1243{
1244 mmfile_t mf1, mf2;
1245 struct diffstat_file *data;
1246
1247 data = diffstat_add(diffstat, name_a, name_b);
1248
1249 if (!one || !two) {
1250 data->is_unmerged = 1;
1251 return;
1252 }
710158e3
JH
1253 if (complete_rewrite) {
1254 diff_populate_filespec(one, 0);
1255 diff_populate_filespec(two, 0);
1256 data->deleted = count_lines(one->data, one->size);
1257 data->added = count_lines(two->data, two->size);
fc3abdf5 1258 goto free_and_return;
710158e3 1259 }
6973dcae
JH
1260 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1261 die("unable to read files to diff");
1262
8c701249 1263 if (file_is_binary(one) || file_is_binary(two)) {
6973dcae 1264 data->is_binary = 1;
b1882587
AP
1265 data->added = mf2.size;
1266 data->deleted = mf1.size;
1267 } else {
6973dcae
JH
1268 /* Crazy xdl interfaces.. */
1269 xpparam_t xpp;
1270 xdemitconf_t xecfg;
1271 xdemitcb_t ecb;
1272
0d21efa5 1273 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1274 xecfg.ctxlen = 0;
1275 xecfg.flags = 0;
1276 ecb.outf = xdiff_outf;
1277 ecb.priv = diffstat;
1278 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1279 }
fc3abdf5
JH
1280
1281 free_and_return:
1282 diff_free_filespec_data(one);
1283 diff_free_filespec_data(two);
6973dcae
JH
1284}
1285
88246898
JS
1286static void builtin_checkdiff(const char *name_a, const char *name_b,
1287 struct diff_filespec *one,
c5a8c3ec 1288 struct diff_filespec *two, struct diff_options *o)
88246898
JS
1289{
1290 mmfile_t mf1, mf2;
1291 struct checkdiff_t data;
1292
1293 if (!two)
1294 return;
1295
1296 memset(&data, 0, sizeof(data));
1297 data.xm.consume = checkdiff_consume;
1298 data.filename = name_b ? name_b : name_a;
1299 data.lineno = 0;
c5a8c3ec 1300 data.color_diff = o->color_diff;
88246898
JS
1301
1302 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1303 die("unable to read files to diff");
1304
8c701249 1305 if (file_is_binary(two))
fc3abdf5 1306 goto free_and_return;
88246898
JS
1307 else {
1308 /* Crazy xdl interfaces.. */
1309 xpparam_t xpp;
1310 xdemitconf_t xecfg;
1311 xdemitcb_t ecb;
1312
1313 xpp.flags = XDF_NEED_MINIMAL;
1314 xecfg.ctxlen = 0;
1315 xecfg.flags = 0;
1316 ecb.outf = xdiff_outf;
1317 ecb.priv = &data;
1318 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1319 }
fc3abdf5
JH
1320 free_and_return:
1321 diff_free_filespec_data(one);
1322 diff_free_filespec_data(two);
88246898
JS
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/*
5adf317b 1347 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
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
3afaa72d
JH
1402static int populate_from_stdin(struct diff_filespec *s)
1403{
1404#define INCREMENT 1024
1405 char *buf;
1406 unsigned long size;
8a912bcb 1407 ssize_t got;
3afaa72d
JH
1408
1409 size = 0;
1410 buf = NULL;
1411 while (1) {
1412 buf = xrealloc(buf, size + INCREMENT);
1413 got = xread(0, buf + size, INCREMENT);
1414 if (!got)
1415 break; /* EOF */
1416 if (got < 0)
1417 return error("error while reading from stdin %s",
1418 strerror(errno));
1419 size += got;
1420 }
1421 s->should_munmap = 0;
1422 s->data = buf;
1423 s->size = size;
1424 s->should_free = 1;
1425 return 0;
1426}
1427
04786756
LT
1428static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1429{
1430 int len;
1431 char *data = xmalloc(100);
1432 len = snprintf(data, 100,
1433 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1434 s->data = data;
1435 s->size = len;
1436 s->should_free = 1;
1437 if (size_only) {
1438 s->data = NULL;
1439 free(data);
1440 }
1441 return 0;
1442}
1443
6973dcae
JH
1444/*
1445 * While doing rename detection and pickaxe operation, we may need to
1446 * grab the data for the blob (or file) for our own in-core comparison.
1447 * diff_filespec has data and size fields for this purpose.
1448 */
1449int diff_populate_filespec(struct diff_filespec *s, int size_only)
1450{
1451 int err = 0;
1452 if (!DIFF_FILE_VALID(s))
1453 die("internal error: asking to populate invalid file.");
1454 if (S_ISDIR(s->mode))
1455 return -1;
1456
6973dcae 1457 if (s->data)
fc3abdf5 1458 return 0;
04786756 1459
6e0b8ed6
JH
1460 if (size_only && 0 < s->size)
1461 return 0;
1462
302b9282 1463 if (S_ISGITLINK(s->mode))
04786756
LT
1464 return diff_populate_gitlink(s, size_only);
1465
6973dcae 1466 if (!s->sha1_valid ||
1510fea7 1467 reuse_worktree_file(s->path, s->sha1, 0)) {
6973dcae
JH
1468 struct stat st;
1469 int fd;
6c510bee
LT
1470 char *buf;
1471 unsigned long size;
1472
3afaa72d
JH
1473 if (!strcmp(s->path, "-"))
1474 return populate_from_stdin(s);
1475
6973dcae
JH
1476 if (lstat(s->path, &st) < 0) {
1477 if (errno == ENOENT) {
1478 err_empty:
1479 err = -1;
1480 empty:
d2543b8e 1481 s->data = (char *)"";
6973dcae
JH
1482 s->size = 0;
1483 return err;
1484 }
1485 }
dc49cd76 1486 s->size = xsize_t(st.st_size);
6973dcae
JH
1487 if (!s->size)
1488 goto empty;
1489 if (size_only)
1490 return 0;
1491 if (S_ISLNK(st.st_mode)) {
1492 int ret;
1493 s->data = xmalloc(s->size);
1494 s->should_free = 1;
1495 ret = readlink(s->path, s->data, s->size);
1496 if (ret < 0) {
1497 free(s->data);
1498 goto err_empty;
1499 }
1500 return 0;
1501 }
1502 fd = open(s->path, O_RDONLY);
1503 if (fd < 0)
1504 goto err_empty;
c4712e45 1505 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1506 close(fd);
6973dcae 1507 s->should_munmap = 1;
6c510bee
LT
1508
1509 /*
1510 * Convert from working tree format to canonical git format
1511 */
6c510bee 1512 size = s->size;
ac78e548
AR
1513 buf = convert_to_git(s->path, s->data, &size);
1514 if (buf) {
6c510bee
LT
1515 munmap(s->data, s->size);
1516 s->should_munmap = 0;
1517 s->data = buf;
1518 s->size = size;
1519 s->should_free = 1;
1520 }
6973dcae
JH
1521 }
1522 else {
21666f1a 1523 enum object_type type;
6e0b8ed6 1524 if (size_only)
21666f1a 1525 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1526 else {
21666f1a 1527 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1528 s->should_free = 1;
1529 }
1530 }
1531 return 0;
1532}
1533
1534void diff_free_filespec_data(struct diff_filespec *s)
1535{
1536 if (s->should_free)
1537 free(s->data);
1538 else if (s->should_munmap)
1539 munmap(s->data, s->size);
fc3abdf5
JH
1540
1541 if (s->should_free || s->should_munmap) {
1542 s->should_free = s->should_munmap = 0;
1543 s->data = NULL;
1544 }
6973dcae
JH
1545 free(s->cnt_data);
1546 s->cnt_data = NULL;
1547}
1548
1549static void prep_temp_blob(struct diff_tempfile *temp,
1550 void *blob,
1551 unsigned long size,
1552 const unsigned char *sha1,
1553 int mode)
1554{
1555 int fd;
1556
1472966c 1557 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae
JH
1558 if (fd < 0)
1559 die("unable to create temp-file");
93822c22 1560 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1561 die("unable to write temp-file");
1562 close(fd);
1563 temp->name = temp->tmp_path;
1564 strcpy(temp->hex, sha1_to_hex(sha1));
1565 temp->hex[40] = 0;
1566 sprintf(temp->mode, "%06o", mode);
1567}
1568
1569static void prepare_temp_file(const char *name,
1570 struct diff_tempfile *temp,
1571 struct diff_filespec *one)
1572{
1573 if (!DIFF_FILE_VALID(one)) {
1574 not_a_valid_file:
1575 /* A '-' entry produces this for file-2, and
1576 * a '+' entry produces this for file-1.
1577 */
1578 temp->name = "/dev/null";
1579 strcpy(temp->hex, ".");
1580 strcpy(temp->mode, ".");
1581 return;
1582 }
1583
1584 if (!one->sha1_valid ||
1510fea7 1585 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1586 struct stat st;
1587 if (lstat(name, &st) < 0) {
1588 if (errno == ENOENT)
1589 goto not_a_valid_file;
1590 die("stat(%s): %s", name, strerror(errno));
1591 }
1592 if (S_ISLNK(st.st_mode)) {
1593 int ret;
1594 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1595 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1596 if (sizeof(buf) <= st.st_size)
1597 die("symlink too long: %s", name);
dc49cd76 1598 ret = readlink(name, buf, sz);
6973dcae
JH
1599 if (ret < 0)
1600 die("readlink(%s)", name);
dc49cd76 1601 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1602 (one->sha1_valid ?
1603 one->sha1 : null_sha1),
1604 (one->sha1_valid ?
1605 one->mode : S_IFLNK));
1606 }
1607 else {
1608 /* we can borrow from the file in the work tree */
1609 temp->name = name;
1610 if (!one->sha1_valid)
1611 strcpy(temp->hex, sha1_to_hex(null_sha1));
1612 else
1613 strcpy(temp->hex, sha1_to_hex(one->sha1));
1614 /* Even though we may sometimes borrow the
1615 * contents from the work tree, we always want
1616 * one->mode. mode is trustworthy even when
1617 * !(one->sha1_valid), as long as
1618 * DIFF_FILE_VALID(one).
1619 */
1620 sprintf(temp->mode, "%06o", one->mode);
1621 }
1622 return;
1623 }
1624 else {
1625 if (diff_populate_filespec(one, 0))
1626 die("cannot read data blob for %s", one->path);
1627 prep_temp_blob(temp, one->data, one->size,
1628 one->sha1, one->mode);
1629 }
1630}
1631
1632static void remove_tempfile(void)
1633{
1634 int i;
1635
1636 for (i = 0; i < 2; i++)
1637 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1638 unlink(diff_temp[i].name);
1639 diff_temp[i].name = NULL;
1640 }
1641}
1642
1643static void remove_tempfile_on_signal(int signo)
1644{
1645 remove_tempfile();
1646 signal(SIGINT, SIG_DFL);
1647 raise(signo);
1648}
1649
1650static int spawn_prog(const char *pgm, const char **arg)
1651{
1652 pid_t pid;
1653 int status;
1654
1655 fflush(NULL);
1656 pid = fork();
1657 if (pid < 0)
1658 die("unable to fork");
1659 if (!pid) {
1660 execvp(pgm, (char *const*) arg);
1661 exit(255);
1662 }
1663
1664 while (waitpid(pid, &status, 0) < 0) {
1665 if (errno == EINTR)
1666 continue;
1667 return -1;
1668 }
1669
1670 /* Earlier we did not check the exit status because
1671 * diff exits non-zero if files are different, and
1672 * we are not interested in knowing that. It was a
1673 * mistake which made it harder to quit a diff-*
1674 * session that uses the git-apply-patch-script as
1675 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1676 * should also exit non-zero only when it wants to
1677 * abort the entire diff-* session.
1678 */
1679 if (WIFEXITED(status) && !WEXITSTATUS(status))
1680 return 0;
1681 return -1;
1682}
1683
1684/* An external diff command takes:
1685 *
1686 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1687 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1688 *
1689 */
1690static void run_external_diff(const char *pgm,
1691 const char *name,
1692 const char *other,
1693 struct diff_filespec *one,
1694 struct diff_filespec *two,
1695 const char *xfrm_msg,
1696 int complete_rewrite)
1697{
1698 const char *spawn_arg[10];
1699 struct diff_tempfile *temp = diff_temp;
1700 int retval;
1701 static int atexit_asked = 0;
1702 const char *othername;
1703 const char **arg = &spawn_arg[0];
1704
1705 othername = (other? other : name);
1706 if (one && two) {
1707 prepare_temp_file(name, &temp[0], one);
1708 prepare_temp_file(othername, &temp[1], two);
1709 if (! atexit_asked &&
1710 (temp[0].name == temp[0].tmp_path ||
1711 temp[1].name == temp[1].tmp_path)) {
1712 atexit_asked = 1;
1713 atexit(remove_tempfile);
1714 }
1715 signal(SIGINT, remove_tempfile_on_signal);
1716 }
1717
1718 if (one && two) {
1719 *arg++ = pgm;
1720 *arg++ = name;
1721 *arg++ = temp[0].name;
1722 *arg++ = temp[0].hex;
1723 *arg++ = temp[0].mode;
1724 *arg++ = temp[1].name;
1725 *arg++ = temp[1].hex;
1726 *arg++ = temp[1].mode;
1727 if (other) {
1728 *arg++ = other;
1729 *arg++ = xfrm_msg;
1730 }
1731 } else {
1732 *arg++ = pgm;
1733 *arg++ = name;
1734 }
1735 *arg = NULL;
1736 retval = spawn_prog(pgm, spawn_arg);
1737 remove_tempfile();
1738 if (retval) {
1739 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1740 exit(1);
1741 }
1742}
1743
f1af60bd
JH
1744static const char *external_diff_attr(const char *name)
1745{
1746 struct git_attr_check attr_diff_check;
1747
1748 setup_diff_attr_check(&attr_diff_check);
1749 if (!git_checkattr(name, 1, &attr_diff_check)) {
1750 const char *value = attr_diff_check.value;
1751 if (!ATTR_TRUE(value) &&
1752 !ATTR_FALSE(value) &&
1753 !ATTR_UNSET(value)) {
1754 struct ll_diff_driver *drv;
1755
1756 if (!user_diff_tail) {
1757 user_diff_tail = &user_diff;
1758 git_config(git_diff_ui_config);
1759 }
1760 for (drv = user_diff; drv; drv = drv->next)
1761 if (!strcmp(drv->name, value))
1762 return drv->cmd;
1763 }
1764 }
1765 return NULL;
1766}
1767
6973dcae
JH
1768static void run_diff_cmd(const char *pgm,
1769 const char *name,
1770 const char *other,
1771 struct diff_filespec *one,
1772 struct diff_filespec *two,
1773 const char *xfrm_msg,
051308f6 1774 struct diff_options *o,
6973dcae
JH
1775 int complete_rewrite)
1776{
f1af60bd
JH
1777 if (!o->allow_external)
1778 pgm = NULL;
1779 else {
1780 const char *cmd = external_diff_attr(name);
1781 if (cmd)
1782 pgm = cmd;
1783 }
1784
6973dcae
JH
1785 if (pgm) {
1786 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1787 complete_rewrite);
1788 return;
1789 }
1790 if (one && two)
1791 builtin_diff(name, other ? other : name,
051308f6 1792 one, two, xfrm_msg, o, complete_rewrite);
6973dcae
JH
1793 else
1794 printf("* Unmerged path %s\n", name);
1795}
1796
1797static void diff_fill_sha1_info(struct diff_filespec *one)
1798{
1799 if (DIFF_FILE_VALID(one)) {
1800 if (!one->sha1_valid) {
1801 struct stat st;
5332b2af
JS
1802 if (!strcmp(one->path, "-")) {
1803 hashcpy(one->sha1, null_sha1);
1804 return;
1805 }
6973dcae
JH
1806 if (lstat(one->path, &st) < 0)
1807 die("stat %s", one->path);
1808 if (index_path(one->sha1, one->path, &st, 0))
1809 die("cannot hash %s\n", one->path);
1810 }
1811 }
1812 else
e702496e 1813 hashclr(one->sha1);
6973dcae
JH
1814}
1815
125b7630
RS
1816static int similarity_index(struct diff_filepair *p)
1817{
1818 return p->score * 100 / MAX_SCORE;
1819}
1820
6973dcae
JH
1821static void run_diff(struct diff_filepair *p, struct diff_options *o)
1822{
1823 const char *pgm = external_diff();
1824 char msg[PATH_MAX*2+300], *xfrm_msg;
1825 struct diff_filespec *one;
1826 struct diff_filespec *two;
1827 const char *name;
1828 const char *other;
1829 char *name_munged, *other_munged;
1830 int complete_rewrite = 0;
1831 int len;
1832
1833 if (DIFF_PAIR_UNMERGED(p)) {
1834 /* unmerged */
051308f6 1835 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
6973dcae
JH
1836 return;
1837 }
1838
1839 name = p->one->path;
1840 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1841 name_munged = quote_one(name);
1842 other_munged = quote_one(other);
1843 one = p->one; two = p->two;
1844
1845 diff_fill_sha1_info(one);
1846 diff_fill_sha1_info(two);
1847
1848 len = 0;
1849 switch (p->status) {
1850 case DIFF_STATUS_COPIED:
1851 len += snprintf(msg + len, sizeof(msg) - len,
1852 "similarity index %d%%\n"
1853 "copy from %s\n"
1854 "copy to %s\n",
125b7630 1855 similarity_index(p), name_munged, other_munged);
6973dcae
JH
1856 break;
1857 case DIFF_STATUS_RENAMED:
1858 len += snprintf(msg + len, sizeof(msg) - len,
1859 "similarity index %d%%\n"
1860 "rename from %s\n"
1861 "rename to %s\n",
125b7630 1862 similarity_index(p), name_munged, other_munged);
6973dcae
JH
1863 break;
1864 case DIFF_STATUS_MODIFIED:
1865 if (p->score) {
1866 len += snprintf(msg + len, sizeof(msg) - len,
1867 "dissimilarity index %d%%\n",
125b7630 1868 similarity_index(p));
6973dcae
JH
1869 complete_rewrite = 1;
1870 break;
1871 }
1872 /* fallthru */
1873 default:
1874 /* nothing */
1875 ;
1876 }
1877
a89fccd2 1878 if (hashcmp(one->sha1, two->sha1)) {
6973dcae 1879 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
6973dcae 1880
82793c55
JH
1881 if (o->binary) {
1882 mmfile_t mf;
8c701249
JH
1883 if ((!fill_mmfile(&mf, one) && file_is_binary(one)) ||
1884 (!fill_mmfile(&mf, two) && file_is_binary(two)))
82793c55
JH
1885 abbrev = 40;
1886 }
6973dcae
JH
1887 len += snprintf(msg + len, sizeof(msg) - len,
1888 "index %.*s..%.*s",
dcb3450f
LT
1889 abbrev, sha1_to_hex(one->sha1),
1890 abbrev, sha1_to_hex(two->sha1));
6973dcae
JH
1891 if (one->mode == two->mode)
1892 len += snprintf(msg + len, sizeof(msg) - len,
1893 " %06o", one->mode);
1894 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1895 }
1896
1897 if (len)
1898 msg[--len] = 0;
1899 xfrm_msg = len ? msg : NULL;
1900
1901 if (!pgm &&
1902 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1903 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1904 /* a filepair that changes between file and symlink
1905 * needs to be split into deletion and creation.
1906 */
1907 struct diff_filespec *null = alloc_filespec(two->path);
051308f6 1908 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
6973dcae
JH
1909 free(null);
1910 null = alloc_filespec(one->path);
051308f6 1911 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
6973dcae
JH
1912 free(null);
1913 }
1914 else
051308f6 1915 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
6973dcae
JH
1916 complete_rewrite);
1917
1918 free(name_munged);
1919 free(other_munged);
1920}
1921
1922static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1923 struct diffstat_t *diffstat)
1924{
1925 const char *name;
1926 const char *other;
710158e3 1927 int complete_rewrite = 0;
6973dcae
JH
1928
1929 if (DIFF_PAIR_UNMERGED(p)) {
1930 /* unmerged */
0d21efa5 1931 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
1932 return;
1933 }
1934
1935 name = p->one->path;
1936 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1937
1938 diff_fill_sha1_info(p->one);
1939 diff_fill_sha1_info(p->two);
1940
710158e3
JH
1941 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1942 complete_rewrite = 1;
0d21efa5 1943 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
1944}
1945
88246898
JS
1946static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1947{
1948 const char *name;
1949 const char *other;
1950
1951 if (DIFF_PAIR_UNMERGED(p)) {
1952 /* unmerged */
1953 return;
1954 }
1955
1956 name = p->one->path;
1957 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1958
1959 diff_fill_sha1_info(p->one);
1960 diff_fill_sha1_info(p->two);
1961
c5a8c3ec 1962 builtin_checkdiff(name, other, p->one, p->two, o);
88246898
JS
1963}
1964
6973dcae
JH
1965void diff_setup(struct diff_options *options)
1966{
1967 memset(options, 0, sizeof(*options));
6973dcae
JH
1968 options->line_termination = '\n';
1969 options->break_opt = -1;
1970 options->rename_limit = -1;
ee1e5412 1971 options->context = 3;
3969cf7d 1972 options->msg_sep = "";
6973dcae
JH
1973
1974 options->change = diff_change;
1975 options->add_remove = diff_addremove;
801235c5 1976 options->color_diff = diff_use_color_default;
b68ea12e 1977 options->detect_rename = diff_detect_rename_default;
6973dcae
JH
1978}
1979
1980int diff_setup_done(struct diff_options *options)
1981{
d7de00f7
TH
1982 int count = 0;
1983
1984 if (options->output_format & DIFF_FORMAT_NAME)
1985 count++;
1986 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1987 count++;
1988 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1989 count++;
1990 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1991 count++;
1992 if (count > 1)
1993 die("--name-only, --name-status, --check and -s are mutually exclusive");
1994
03b9d560
JH
1995 if (options->find_copies_harder)
1996 options->detect_rename = DIFF_DETECT_COPY;
1997
c6744349
TH
1998 if (options->output_format & (DIFF_FORMAT_NAME |
1999 DIFF_FORMAT_NAME_STATUS |
2000 DIFF_FORMAT_CHECKDIFF |
2001 DIFF_FORMAT_NO_OUTPUT))
2002 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2003 DIFF_FORMAT_NUMSTAT |
c6744349 2004 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2005 DIFF_FORMAT_SHORTSTAT |
c6744349
TH
2006 DIFF_FORMAT_SUMMARY |
2007 DIFF_FORMAT_PATCH);
2008
6973dcae
JH
2009 /*
2010 * These cases always need recursive; we do not drop caller-supplied
2011 * recursive bits for other formats here.
2012 */
c6744349 2013 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2014 DIFF_FORMAT_NUMSTAT |
c6744349 2015 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2016 DIFF_FORMAT_SHORTSTAT |
d7014dc0 2017 DIFF_FORMAT_SUMMARY |
c6744349 2018 DIFF_FORMAT_CHECKDIFF))
6973dcae 2019 options->recursive = 1;
5e363541 2020 /*
3969cf7d 2021 * Also pickaxe would not work very well if you do not say recursive
5e363541 2022 */
3969cf7d
JH
2023 if (options->pickaxe)
2024 options->recursive = 1;
5e363541 2025
6973dcae
JH
2026 if (options->detect_rename && options->rename_limit < 0)
2027 options->rename_limit = diff_rename_limit_default;
2028 if (options->setup & DIFF_SETUP_USE_CACHE) {
2029 if (!active_cache)
2030 /* read-cache does not die even when it fails
2031 * so it is safe for us to do this here. Also
2032 * it does not smudge active_cache or active_nr
2033 * when it fails, so we do not have to worry about
2034 * cleaning it up ourselves either.
2035 */
2036 read_cache();
2037 }
6973dcae
JH
2038 if (options->abbrev <= 0 || 40 < options->abbrev)
2039 options->abbrev = 40; /* full */
2040
68aacb2f
JH
2041 /*
2042 * It does not make sense to show the first hit we happened
2043 * to have found. It does not make sense not to return with
2044 * exit code in such a case either.
2045 */
2046 if (options->quiet) {
2047 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2048 options->exit_with_status = 1;
2049 }
2050
2051 /*
2052 * If we postprocess in diffcore, we cannot simply return
2053 * upon the first hit. We need to run diff as usual.
2054 */
2055 if (options->pickaxe || options->filter)
2056 options->quiet = 0;
2057
6973dcae
JH
2058 return 0;
2059}
2060
d2543b8e 2061static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2062{
2063 char c, *eq;
2064 int len;
2065
2066 if (*arg != '-')
2067 return 0;
2068 c = *++arg;
2069 if (!c)
2070 return 0;
2071 if (c == arg_short) {
2072 c = *++arg;
2073 if (!c)
2074 return 1;
2075 if (val && isdigit(c)) {
2076 char *end;
2077 int n = strtoul(arg, &end, 10);
2078 if (*end)
2079 return 0;
2080 *val = n;
2081 return 1;
2082 }
2083 return 0;
2084 }
2085 if (c != '-')
2086 return 0;
2087 arg++;
2088 eq = strchr(arg, '=');
2089 if (eq)
2090 len = eq - arg;
2091 else
2092 len = strlen(arg);
2093 if (!len || strncmp(arg, arg_long, len))
2094 return 0;
2095 if (eq) {
2096 int n;
2097 char *end;
2098 if (!isdigit(*++eq))
2099 return 0;
2100 n = strtoul(eq, &end, 10);
2101 if (*end)
2102 return 0;
2103 *val = n;
2104 }
2105 return 1;
2106}
2107
16befb8b
JH
2108static int diff_scoreopt_parse(const char *opt);
2109
6973dcae
JH
2110int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2111{
2112 const char *arg = av[0];
2113 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2114 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2115 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2116 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2117 else if (!strcmp(arg, "--raw"))
2118 options->output_format |= DIFF_FORMAT_RAW;
6973dcae 2119 else if (!strcmp(arg, "--patch-with-raw")) {
c6744349 2120 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
6973dcae 2121 }
74e2abe5
JH
2122 else if (!strcmp(arg, "--numstat")) {
2123 options->output_format |= DIFF_FORMAT_NUMSTAT;
2124 }
ebd124c6
NP
2125 else if (!strcmp(arg, "--shortstat")) {
2126 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2127 }
cc44c765 2128 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2129 char *end;
2130 int width = options->stat_width;
2131 int name_width = options->stat_name_width;
2132 arg += 6;
2133 end = (char *)arg;
2134
2135 switch (*arg) {
2136 case '-':
cc44c765 2137 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2138 width = strtoul(arg + 7, &end, 10);
cc44c765 2139 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2140 name_width = strtoul(arg + 12, &end, 10);
2141 break;
2142 case '=':
2143 width = strtoul(arg+1, &end, 10);
2144 if (*end == ',')
2145 name_width = strtoul(end+1, &end, 10);
2146 }
2147
2148 /* Important! This checks all the error cases! */
2149 if (*end)
2150 return 0;
c6744349 2151 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2152 options->stat_name_width = name_width;
2153 options->stat_width = width;
a2540023 2154 }
88246898 2155 else if (!strcmp(arg, "--check"))
c6744349 2156 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4bbd261b 2157 else if (!strcmp(arg, "--summary"))
c6744349 2158 options->output_format |= DIFF_FORMAT_SUMMARY;
6973dcae 2159 else if (!strcmp(arg, "--patch-with-stat")) {
c6744349 2160 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
6973dcae
JH
2161 }
2162 else if (!strcmp(arg, "-z"))
2163 options->line_termination = 0;
cc44c765 2164 else if (!prefixcmp(arg, "-l"))
6973dcae
JH
2165 options->rename_limit = strtoul(arg+2, NULL, 10);
2166 else if (!strcmp(arg, "--full-index"))
2167 options->full_index = 1;
0660626c 2168 else if (!strcmp(arg, "--binary")) {
c6744349 2169 options->output_format |= DIFF_FORMAT_PATCH;
82793c55 2170 options->binary = 1;
0660626c 2171 }
63ac4501 2172 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
6d64ea96
SF
2173 options->text = 1;
2174 }
6973dcae 2175 else if (!strcmp(arg, "--name-only"))
c6744349 2176 options->output_format |= DIFF_FORMAT_NAME;
6973dcae 2177 else if (!strcmp(arg, "--name-status"))
c6744349 2178 options->output_format |= DIFF_FORMAT_NAME_STATUS;
6973dcae
JH
2179 else if (!strcmp(arg, "-R"))
2180 options->reverse_diff = 1;
cc44c765 2181 else if (!prefixcmp(arg, "-S"))
6973dcae 2182 options->pickaxe = arg + 2;
c6744349
TH
2183 else if (!strcmp(arg, "-s")) {
2184 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2185 }
cc44c765 2186 else if (!prefixcmp(arg, "-O"))
6973dcae 2187 options->orderfile = arg + 2;
cc44c765 2188 else if (!prefixcmp(arg, "--diff-filter="))
6973dcae
JH
2189 options->filter = arg + 14;
2190 else if (!strcmp(arg, "--pickaxe-all"))
2191 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2192 else if (!strcmp(arg, "--pickaxe-regex"))
2193 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
cc44c765 2194 else if (!prefixcmp(arg, "-B")) {
6973dcae
JH
2195 if ((options->break_opt =
2196 diff_scoreopt_parse(arg)) == -1)
2197 return -1;
2198 }
cc44c765 2199 else if (!prefixcmp(arg, "-M")) {
6973dcae
JH
2200 if ((options->rename_score =
2201 diff_scoreopt_parse(arg)) == -1)
2202 return -1;
2203 options->detect_rename = DIFF_DETECT_RENAME;
2204 }
cc44c765 2205 else if (!prefixcmp(arg, "-C")) {
ca6c0970
JS
2206 if (options->detect_rename == DIFF_DETECT_COPY)
2207 options->find_copies_harder = 1;
6973dcae
JH
2208 if ((options->rename_score =
2209 diff_scoreopt_parse(arg)) == -1)
2210 return -1;
2211 options->detect_rename = DIFF_DETECT_COPY;
2212 }
2213 else if (!strcmp(arg, "--find-copies-harder"))
2214 options->find_copies_harder = 1;
750f7b66
LT
2215 else if (!strcmp(arg, "--follow"))
2216 options->follow_renames = 1;
6973dcae
JH
2217 else if (!strcmp(arg, "--abbrev"))
2218 options->abbrev = DEFAULT_ABBREV;
cc44c765 2219 else if (!prefixcmp(arg, "--abbrev=")) {
6973dcae
JH
2220 options->abbrev = strtoul(arg + 9, NULL, 10);
2221 if (options->abbrev < MINIMUM_ABBREV)
2222 options->abbrev = MINIMUM_ABBREV;
2223 else if (40 < options->abbrev)
2224 options->abbrev = 40;
2225 }
cd112cef
JS
2226 else if (!strcmp(arg, "--color"))
2227 options->color_diff = 1;
fef88bb0
JH
2228 else if (!strcmp(arg, "--no-color"))
2229 options->color_diff = 0;
0d21efa5
JS
2230 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2231 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2232 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2233 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
859f9c45
JS
2234 else if (!strcmp(arg, "--ignore-space-at-eol"))
2235 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
f59a59e2
JS
2236 else if (!strcmp(arg, "--color-words"))
2237 options->color_diff = options->color_diff_words = 1;
b68ea12e
EW
2238 else if (!strcmp(arg, "--no-renames"))
2239 options->detect_rename = 0;
41bbf9d5
AR
2240 else if (!strcmp(arg, "--exit-code"))
2241 options->exit_with_status = 1;
68aacb2f
JH
2242 else if (!strcmp(arg, "--quiet"))
2243 options->quiet = 1;
72909bef
JS
2244 else if (!strcmp(arg, "--ext-diff"))
2245 options->allow_external = 1;
2246 else if (!strcmp(arg, "--no-ext-diff"))
2247 options->allow_external = 0;
6973dcae
JH
2248 else
2249 return 0;
2250 return 1;
2251}
2252
2253static int parse_num(const char **cp_p)
2254{
2255 unsigned long num, scale;
2256 int ch, dot;
2257 const char *cp = *cp_p;
2258
2259 num = 0;
2260 scale = 1;
2261 dot = 0;
2262 for(;;) {
2263 ch = *cp;
2264 if ( !dot && ch == '.' ) {
2265 scale = 1;
2266 dot = 1;
2267 } else if ( ch == '%' ) {
2268 scale = dot ? scale*100 : 100;
2269 cp++; /* % is always at the end */
2270 break;
2271 } else if ( ch >= '0' && ch <= '9' ) {
2272 if ( scale < 100000 ) {
2273 scale *= 10;
2274 num = (num*10) + (ch-'0');
2275 }
2276 } else {
2277 break;
2278 }
2279 cp++;
2280 }
2281 *cp_p = cp;
2282
2283 /* user says num divided by scale and we say internally that
2284 * is MAX_SCORE * num / scale.
2285 */
dc49cd76 2286 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2287}
2288
16befb8b 2289static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2290{
2291 int opt1, opt2, cmd;
2292
2293 if (*opt++ != '-')
2294 return -1;
2295 cmd = *opt++;
2296 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2297 return -1; /* that is not a -M, -C nor -B option */
2298
2299 opt1 = parse_num(&opt);
2300 if (cmd != 'B')
2301 opt2 = 0;
2302 else {
2303 if (*opt == 0)
2304 opt2 = 0;
2305 else if (*opt != '/')
2306 return -1; /* we expect -B80/99 or -B80 */
2307 else {
2308 opt++;
2309 opt2 = parse_num(&opt);
2310 }
2311 }
2312 if (*opt != 0)
2313 return -1;
2314 return opt1 | (opt2 << 16);
2315}
2316
2317struct diff_queue_struct diff_queued_diff;
2318
2319void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2320{
2321 if (queue->alloc <= queue->nr) {
2322 queue->alloc = alloc_nr(queue->alloc);
2323 queue->queue = xrealloc(queue->queue,
2324 sizeof(dp) * queue->alloc);
2325 }
2326 queue->queue[queue->nr++] = dp;
2327}
2328
2329struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2330 struct diff_filespec *one,
2331 struct diff_filespec *two)
2332{
ef677686 2333 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2334 dp->one = one;
2335 dp->two = two;
6973dcae
JH
2336 if (queue)
2337 diff_q(queue, dp);
2338 return dp;
2339}
2340
2341void diff_free_filepair(struct diff_filepair *p)
2342{
2343 diff_free_filespec_data(p->one);
2344 diff_free_filespec_data(p->two);
2345 free(p->one);
2346 free(p->two);
2347 free(p);
2348}
2349
2350/* This is different from find_unique_abbrev() in that
2351 * it stuffs the result with dots for alignment.
2352 */
2353const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2354{
2355 int abblen;
2356 const char *abbrev;
2357 if (len == 40)
2358 return sha1_to_hex(sha1);
2359
2360 abbrev = find_unique_abbrev(sha1, len);
2361 if (!abbrev)
2362 return sha1_to_hex(sha1);
2363 abblen = strlen(abbrev);
2364 if (abblen < 37) {
2365 static char hex[41];
2366 if (len < abblen && abblen <= len + 2)
2367 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2368 else
2369 sprintf(hex, "%s...", abbrev);
2370 return hex;
2371 }
2372 return sha1_to_hex(sha1);
2373}
2374
2375static void diff_flush_raw(struct diff_filepair *p,
c6744349 2376 struct diff_options *options)
6973dcae
JH
2377{
2378 int two_paths;
2379 char status[10];
2380 int abbrev = options->abbrev;
2381 const char *path_one, *path_two;
c6744349
TH
2382 int inter_name_termination = '\t';
2383 int line_termination = options->line_termination;
2384
2385 if (!line_termination)
2386 inter_name_termination = 0;
6973dcae
JH
2387
2388 path_one = p->one->path;
2389 path_two = p->two->path;
2390 if (line_termination) {
2391 path_one = quote_one(path_one);
2392 path_two = quote_one(path_two);
2393 }
2394
2395 if (p->score)
125b7630 2396 sprintf(status, "%c%03d", p->status, similarity_index(p));
6973dcae
JH
2397 else {
2398 status[0] = p->status;
2399 status[1] = 0;
2400 }
2401 switch (p->status) {
2402 case DIFF_STATUS_COPIED:
2403 case DIFF_STATUS_RENAMED:
2404 two_paths = 1;
2405 break;
2406 case DIFF_STATUS_ADDED:
2407 case DIFF_STATUS_DELETED:
2408 two_paths = 0;
2409 break;
2410 default:
2411 two_paths = 0;
2412 break;
2413 }
c6744349 2414 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
6973dcae
JH
2415 printf(":%06o %06o %s ",
2416 p->one->mode, p->two->mode,
2417 diff_unique_abbrev(p->one->sha1, abbrev));
2418 printf("%s ",
2419 diff_unique_abbrev(p->two->sha1, abbrev));
2420 }
3cb56738
JS
2421 printf("%s%c%s", status, inter_name_termination,
2422 two_paths || p->one->mode ? path_one : path_two);
6973dcae
JH
2423 if (two_paths)
2424 printf("%c%s", inter_name_termination, path_two);
2425 putchar(line_termination);
2426 if (path_one != p->one->path)
2427 free((void*)path_one);
2428 if (path_two != p->two->path)
2429 free((void*)path_two);
2430}
2431
471efb09 2432static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
6973dcae
JH
2433{
2434 char *path = p->two->path;
2435
471efb09 2436 if (opt->line_termination)
6973dcae 2437 path = quote_one(p->two->path);
471efb09 2438 printf("%s%c", path, opt->line_termination);
6973dcae
JH
2439 if (p->two->path != path)
2440 free(path);
2441}
2442
2443int diff_unmodified_pair(struct diff_filepair *p)
2444{
2445 /* This function is written stricter than necessary to support
2446 * the currently implemented transformers, but the idea is to
2447 * let transformers to produce diff_filepairs any way they want,
2448 * and filter and clean them up here before producing the output.
2449 */
2450 struct diff_filespec *one, *two;
2451
2452 if (DIFF_PAIR_UNMERGED(p))
2453 return 0; /* unmerged is interesting */
2454
2455 one = p->one;
2456 two = p->two;
2457
2458 /* deletion, addition, mode or type change
2459 * and rename are all interesting.
2460 */
2461 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2462 DIFF_PAIR_MODE_CHANGED(p) ||
2463 strcmp(one->path, two->path))
2464 return 0;
2465
2466 /* both are valid and point at the same path. that is, we are
2467 * dealing with a change.
2468 */
2469 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2470 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2471 return 1; /* no change */
2472 if (!one->sha1_valid && !two->sha1_valid)
2473 return 1; /* both look at the same file on the filesystem. */
2474 return 0;
2475}
2476
2477static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2478{
2479 if (diff_unmodified_pair(p))
2480 return;
2481
2482 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2483 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2484 return; /* no tree diffs in patch format */
2485
2486 run_diff(p, o);
2487}
2488
2489static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2490 struct diffstat_t *diffstat)
2491{
2492 if (diff_unmodified_pair(p))
2493 return;
2494
2495 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2496 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2497 return; /* no tree diffs in patch format */
2498
2499 run_diffstat(p, o, diffstat);
2500}
2501
88246898
JS
2502static void diff_flush_checkdiff(struct diff_filepair *p,
2503 struct diff_options *o)
2504{
2505 if (diff_unmodified_pair(p))
2506 return;
2507
2508 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2509 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2510 return; /* no tree diffs in patch format */
2511
2512 run_checkdiff(p, o);
2513}
2514
6973dcae
JH
2515int diff_queue_is_empty(void)
2516{
2517 struct diff_queue_struct *q = &diff_queued_diff;
2518 int i;
2519 for (i = 0; i < q->nr; i++)
2520 if (!diff_unmodified_pair(q->queue[i]))
2521 return 0;
2522 return 1;
2523}
2524
2525#if DIFF_DEBUG
2526void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2527{
2528 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2529 x, one ? one : "",
2530 s->path,
2531 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2532 s->mode,
2533 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2534 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2535 x, one ? one : "",
2536 s->size, s->xfrm_flags);
2537}
2538
2539void diff_debug_filepair(const struct diff_filepair *p, int i)
2540{
2541 diff_debug_filespec(p->one, i, "one");
2542 diff_debug_filespec(p->two, i, "two");
2543 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2544 p->score, p->status ? p->status : '?',
2545 p->source_stays, p->broken_pair);
2546}
2547
2548void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2549{
2550 int i;
2551 if (msg)
2552 fprintf(stderr, "%s\n", msg);
2553 fprintf(stderr, "q->nr = %d\n", q->nr);
2554 for (i = 0; i < q->nr; i++) {
2555 struct diff_filepair *p = q->queue[i];
2556 diff_debug_filepair(p, i);
2557 }
2558}
2559#endif
2560
2561static void diff_resolve_rename_copy(void)
2562{
2563 int i, j;
2564 struct diff_filepair *p, *pp;
2565 struct diff_queue_struct *q = &diff_queued_diff;
2566
2567 diff_debug_queue("resolve-rename-copy", q);
2568
2569 for (i = 0; i < q->nr; i++) {
2570 p = q->queue[i];
2571 p->status = 0; /* undecided */
2572 if (DIFF_PAIR_UNMERGED(p))
2573 p->status = DIFF_STATUS_UNMERGED;
2574 else if (!DIFF_FILE_VALID(p->one))
2575 p->status = DIFF_STATUS_ADDED;
2576 else if (!DIFF_FILE_VALID(p->two))
2577 p->status = DIFF_STATUS_DELETED;
2578 else if (DIFF_PAIR_TYPE_CHANGED(p))
2579 p->status = DIFF_STATUS_TYPE_CHANGED;
2580
2581 /* from this point on, we are dealing with a pair
2582 * whose both sides are valid and of the same type, i.e.
2583 * either in-place edit or rename/copy edit.
2584 */
2585 else if (DIFF_PAIR_RENAME(p)) {
2586 if (p->source_stays) {
2587 p->status = DIFF_STATUS_COPIED;
2588 continue;
2589 }
2590 /* See if there is some other filepair that
2591 * copies from the same source as us. If so
2592 * we are a copy. Otherwise we are either a
2593 * copy if the path stays, or a rename if it
2594 * does not, but we already handled "stays" case.
2595 */
2596 for (j = i + 1; j < q->nr; j++) {
2597 pp = q->queue[j];
2598 if (strcmp(pp->one->path, p->one->path))
2599 continue; /* not us */
2600 if (!DIFF_PAIR_RENAME(pp))
2601 continue; /* not a rename/copy */
2602 /* pp is a rename/copy from the same source */
2603 p->status = DIFF_STATUS_COPIED;
2604 break;
2605 }
2606 if (!p->status)
2607 p->status = DIFF_STATUS_RENAMED;
2608 }
a89fccd2 2609 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2610 p->one->mode != p->two->mode ||
2611 is_null_sha1(p->one->sha1))
6973dcae
JH
2612 p->status = DIFF_STATUS_MODIFIED;
2613 else {
2614 /* This is a "no-change" entry and should not
2615 * happen anymore, but prepare for broken callers.
2616 */
2617 error("feeding unmodified %s to diffcore",
2618 p->one->path);
2619 p->status = DIFF_STATUS_UNKNOWN;
2620 }
2621 }
2622 diff_debug_queue("resolve-rename-copy done", q);
2623}
2624
c6744349 2625static int check_pair_status(struct diff_filepair *p)
6973dcae 2626{
6973dcae
JH
2627 switch (p->status) {
2628 case DIFF_STATUS_UNKNOWN:
c6744349 2629 return 0;
6973dcae
JH
2630 case 0:
2631 die("internal error in diff-resolve-rename-copy");
6973dcae 2632 default:
c6744349 2633 return 1;
6973dcae
JH
2634 }
2635}
2636
c6744349
TH
2637static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2638{
2639 int fmt = opt->output_format;
2640
2641 if (fmt & DIFF_FORMAT_CHECKDIFF)
2642 diff_flush_checkdiff(p, opt);
2643 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2644 diff_flush_raw(p, opt);
2645 else if (fmt & DIFF_FORMAT_NAME)
471efb09 2646 diff_flush_name(p, opt);
c6744349
TH
2647}
2648
4bbd261b
SE
2649static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2650{
0d26a64e 2651 char *name = quote_one(fs->path);
4bbd261b 2652 if (fs->mode)
0d26a64e 2653 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
4bbd261b 2654 else
0d26a64e
AJ
2655 printf(" %s %s\n", newdelete, name);
2656 free(name);
4bbd261b
SE
2657}
2658
2659
2660static void show_mode_change(struct diff_filepair *p, int show_name)
2661{
2662 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
0d26a64e
AJ
2663 if (show_name) {
2664 char *name = quote_one(p->two->path);
4bbd261b 2665 printf(" mode change %06o => %06o %s\n",
0d26a64e
AJ
2666 p->one->mode, p->two->mode, name);
2667 free(name);
2668 }
4bbd261b
SE
2669 else
2670 printf(" mode change %06o => %06o\n",
2671 p->one->mode, p->two->mode);
2672 }
2673}
2674
2675static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2676{
b9f44164 2677 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2678
125b7630 2679 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 2680 free(names);
4bbd261b
SE
2681 show_mode_change(p, 0);
2682}
2683
2684static void diff_summary(struct diff_filepair *p)
2685{
2686 switch(p->status) {
2687 case DIFF_STATUS_DELETED:
2688 show_file_mode_name("delete", p->one);
2689 break;
2690 case DIFF_STATUS_ADDED:
2691 show_file_mode_name("create", p->two);
2692 break;
2693 case DIFF_STATUS_COPIED:
2694 show_rename_copy("copy", p);
2695 break;
2696 case DIFF_STATUS_RENAMED:
2697 show_rename_copy("rename", p);
2698 break;
2699 default:
2700 if (p->score) {
0d26a64e
AJ
2701 char *name = quote_one(p->two->path);
2702 printf(" rewrite %s (%d%%)\n", name,
125b7630 2703 similarity_index(p));
0d26a64e 2704 free(name);
4bbd261b
SE
2705 show_mode_change(p, 0);
2706 } else show_mode_change(p, 1);
2707 break;
2708 }
2709}
2710
fcb3d0ad
JS
2711struct patch_id_t {
2712 struct xdiff_emit_state xm;
2713 SHA_CTX *ctx;
2714 int patchlen;
2715};
2716
2717static int remove_space(char *line, int len)
2718{
2719 int i;
2720 char *dst = line;
2721 unsigned char c;
2722
2723 for (i = 0; i < len; i++)
2724 if (!isspace((c = line[i])))
2725 *dst++ = c;
2726
2727 return dst - line;
2728}
2729
2730static void patch_id_consume(void *priv, char *line, unsigned long len)
2731{
2732 struct patch_id_t *data = priv;
2733 int new_len;
2734
2735 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 2736 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
2737 return;
2738
2739 new_len = remove_space(line, len);
2740
2741 SHA1_Update(data->ctx, line, new_len);
2742 data->patchlen += new_len;
2743}
2744
2745/* returns 0 upon success, and writes result into sha1 */
2746static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2747{
2748 struct diff_queue_struct *q = &diff_queued_diff;
2749 int i;
2750 SHA_CTX ctx;
2751 struct patch_id_t data;
2752 char buffer[PATH_MAX * 4 + 20];
2753
2754 SHA1_Init(&ctx);
2755 memset(&data, 0, sizeof(struct patch_id_t));
2756 data.ctx = &ctx;
2757 data.xm.consume = patch_id_consume;
2758
2759 for (i = 0; i < q->nr; i++) {
2760 xpparam_t xpp;
2761 xdemitconf_t xecfg;
2762 xdemitcb_t ecb;
2763 mmfile_t mf1, mf2;
2764 struct diff_filepair *p = q->queue[i];
2765 int len1, len2;
2766
2767 if (p->status == 0)
2768 return error("internal diff status error");
2769 if (p->status == DIFF_STATUS_UNKNOWN)
2770 continue;
2771 if (diff_unmodified_pair(p))
2772 continue;
2773 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2774 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2775 continue;
2776 if (DIFF_PAIR_UNMERGED(p))
2777 continue;
2778
2779 diff_fill_sha1_info(p->one);
2780 diff_fill_sha1_info(p->two);
2781 if (fill_mmfile(&mf1, p->one) < 0 ||
2782 fill_mmfile(&mf2, p->two) < 0)
2783 return error("unable to read files to diff");
2784
2785 /* Maybe hash p->two? into the patch id? */
8c701249 2786 if (file_is_binary(p->two))
fcb3d0ad
JS
2787 continue;
2788
2789 len1 = remove_space(p->one->path, strlen(p->one->path));
2790 len2 = remove_space(p->two->path, strlen(p->two->path));
2791 if (p->one->mode == 0)
2792 len1 = snprintf(buffer, sizeof(buffer),
2793 "diff--gita/%.*sb/%.*s"
2794 "newfilemode%06o"
2795 "---/dev/null"
2796 "+++b/%.*s",
2797 len1, p->one->path,
2798 len2, p->two->path,
2799 p->two->mode,
2800 len2, p->two->path);
2801 else if (p->two->mode == 0)
2802 len1 = snprintf(buffer, sizeof(buffer),
2803 "diff--gita/%.*sb/%.*s"
2804 "deletedfilemode%06o"
2805 "---a/%.*s"
2806 "+++/dev/null",
2807 len1, p->one->path,
2808 len2, p->two->path,
2809 p->one->mode,
2810 len1, p->one->path);
2811 else
2812 len1 = snprintf(buffer, sizeof(buffer),
2813 "diff--gita/%.*sb/%.*s"
2814 "---a/%.*s"
2815 "+++b/%.*s",
2816 len1, p->one->path,
2817 len2, p->two->path,
2818 len1, p->one->path,
2819 len2, p->two->path);
2820 SHA1_Update(&ctx, buffer, len1);
2821
2822 xpp.flags = XDF_NEED_MINIMAL;
2823 xecfg.ctxlen = 3;
9fdc3bb5 2824 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
2825 ecb.outf = xdiff_outf;
2826 ecb.priv = &data;
2827 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2828 }
2829
2830 SHA1_Final(sha1, &ctx);
2831 return 0;
2832}
2833
2834int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2835{
2836 struct diff_queue_struct *q = &diff_queued_diff;
2837 int i;
2838 int result = diff_get_patch_id(options, sha1);
2839
2840 for (i = 0; i < q->nr; i++)
2841 diff_free_filepair(q->queue[i]);
2842
2843 free(q->queue);
2844 q->queue = NULL;
2845 q->nr = q->alloc = 0;
2846
2847 return result;
2848}
2849
946c3784 2850static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 2851{
6973dcae 2852 int i;
6973dcae 2853
946c3784
TH
2854 for (i = 0; i < q->nr; i++) {
2855 const struct diff_filepair *p = q->queue[i];
2856
2857 switch (p->status) {
2858 case DIFF_STATUS_DELETED:
2859 case DIFF_STATUS_ADDED:
2860 case DIFF_STATUS_COPIED:
2861 case DIFF_STATUS_RENAMED:
2862 return 0;
2863 default:
2864 if (p->score)
2865 return 0;
2866 if (p->one->mode && p->two->mode &&
2867 p->one->mode != p->two->mode)
2868 return 0;
2869 break;
2870 }
6973dcae 2871 }
946c3784
TH
2872 return 1;
2873}
2874
6973dcae
JH
2875void diff_flush(struct diff_options *options)
2876{
2877 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 2878 int i, output_format = options->output_format;
946c3784 2879 int separator = 0;
6973dcae 2880
c6744349
TH
2881 /*
2882 * Order: raw, stat, summary, patch
2883 * or: name/name-status/checkdiff (other bits clear)
2884 */
946c3784
TH
2885 if (!q->nr)
2886 goto free_queue;
6973dcae 2887
c6744349
TH
2888 if (output_format & (DIFF_FORMAT_RAW |
2889 DIFF_FORMAT_NAME |
2890 DIFF_FORMAT_NAME_STATUS |
2891 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
2892 for (i = 0; i < q->nr; i++) {
2893 struct diff_filepair *p = q->queue[i];
c6744349
TH
2894 if (check_pair_status(p))
2895 flush_one_pair(p, options);
6973dcae 2896 }
946c3784 2897 separator++;
6973dcae 2898 }
c6744349 2899
ebd124c6 2900 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 2901 struct diffstat_t diffstat;
c6744349 2902
5e2b0636
TH
2903 memset(&diffstat, 0, sizeof(struct diffstat_t));
2904 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
2905 for (i = 0; i < q->nr; i++) {
2906 struct diff_filepair *p = q->queue[i];
c6744349 2907 if (check_pair_status(p))
5e2b0636 2908 diff_flush_stat(p, options, &diffstat);
6973dcae 2909 }
74e2abe5
JH
2910 if (output_format & DIFF_FORMAT_NUMSTAT)
2911 show_numstat(&diffstat, options);
2912 if (output_format & DIFF_FORMAT_DIFFSTAT)
2913 show_stats(&diffstat, options);
ebd124c6
NP
2914 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2915 show_shortstats(&diffstat);
3969cf7d 2916 separator++;
6973dcae
JH
2917 }
2918
946c3784 2919 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349
TH
2920 for (i = 0; i < q->nr; i++)
2921 diff_summary(q->queue[i]);
3969cf7d 2922 separator++;
6973dcae
JH
2923 }
2924
c6744349 2925 if (output_format & DIFF_FORMAT_PATCH) {
946c3784
TH
2926 if (separator) {
2927 if (options->stat_sep) {
2928 /* attach patch instead of inline */
c6744349 2929 fputs(options->stat_sep, stdout);
946c3784 2930 } else {
c6744349 2931 putchar(options->line_termination);
946c3784 2932 }
c6744349
TH
2933 }
2934
2935 for (i = 0; i < q->nr; i++) {
2936 struct diff_filepair *p = q->queue[i];
2937 if (check_pair_status(p))
2938 diff_flush_patch(p, options);
2939 }
4bbd261b
SE
2940 }
2941
04245581
JK
2942 if (output_format & DIFF_FORMAT_CALLBACK)
2943 options->format_callback(q, options, options->format_callback_data);
2944
c6744349
TH
2945 for (i = 0; i < q->nr; i++)
2946 diff_free_filepair(q->queue[i]);
946c3784 2947free_queue:
6973dcae
JH
2948 free(q->queue);
2949 q->queue = NULL;
2950 q->nr = q->alloc = 0;
2951}
2952
2953static void diffcore_apply_filter(const char *filter)
2954{
2955 int i;
2956 struct diff_queue_struct *q = &diff_queued_diff;
2957 struct diff_queue_struct outq;
2958 outq.queue = NULL;
2959 outq.nr = outq.alloc = 0;
2960
2961 if (!filter)
2962 return;
2963
2964 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2965 int found;
2966 for (i = found = 0; !found && i < q->nr; i++) {
2967 struct diff_filepair *p = q->queue[i];
2968 if (((p->status == DIFF_STATUS_MODIFIED) &&
2969 ((p->score &&
2970 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2971 (!p->score &&
2972 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2973 ((p->status != DIFF_STATUS_MODIFIED) &&
2974 strchr(filter, p->status)))
2975 found++;
2976 }
2977 if (found)
2978 return;
2979
2980 /* otherwise we will clear the whole queue
2981 * by copying the empty outq at the end of this
2982 * function, but first clear the current entries
2983 * in the queue.
2984 */
2985 for (i = 0; i < q->nr; i++)
2986 diff_free_filepair(q->queue[i]);
2987 }
2988 else {
2989 /* Only the matching ones */
2990 for (i = 0; i < q->nr; i++) {
2991 struct diff_filepair *p = q->queue[i];
2992
2993 if (((p->status == DIFF_STATUS_MODIFIED) &&
2994 ((p->score &&
2995 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2996 (!p->score &&
2997 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2998 ((p->status != DIFF_STATUS_MODIFIED) &&
2999 strchr(filter, p->status)))
3000 diff_q(&outq, p);
3001 else
3002 diff_free_filepair(p);
3003 }
3004 }
3005 free(q->queue);
3006 *q = outq;
3007}
3008
3009void diffcore_std(struct diff_options *options)
3010{
68aacb2f
JH
3011 if (options->quiet)
3012 return;
706098af
JH
3013
3014 /*
3015 * break/rename count similarity differently depending on
3016 * the binary-ness.
3017 */
3018 if ((options->break_opt != -1) || (options->detect_rename)) {
3019 struct diff_queue_struct *q = &diff_queued_diff;
3020 int i;
3021
3022 for (i = 0; i < q->nr; i++) {
3023 struct diff_filepair *p = q->queue[i];
3024 p->one->is_binary = file_is_binary(p->one);
3025 p->two->is_binary = file_is_binary(p->two);
3026 }
3027 }
3028
6973dcae
JH
3029 if (options->break_opt != -1)
3030 diffcore_break(options->break_opt);
3031 if (options->detect_rename)
3032 diffcore_rename(options);
3033 if (options->break_opt != -1)
3034 diffcore_merge_broken();
3035 if (options->pickaxe)
3036 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3037 if (options->orderfile)
3038 diffcore_order(options->orderfile);
3039 diff_resolve_rename_copy();
3040 diffcore_apply_filter(options->filter);
68aacb2f
JH
3041
3042 options->has_changes = !!diff_queued_diff.nr;
6973dcae
JH
3043}
3044
3045
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JH
3046void diff_addremove(struct diff_options *options,
3047 int addremove, unsigned mode,
3048 const unsigned char *sha1,
3049 const char *base, const char *path)
3050{
3051 char concatpath[PATH_MAX];
3052 struct diff_filespec *one, *two;
3053
3054 /* This may look odd, but it is a preparation for
3055 * feeding "there are unchanged files which should
3056 * not produce diffs, but when you are doing copy
3057 * detection you would need them, so here they are"
3058 * entries to the diff-core. They will be prefixed
3059 * with something like '=' or '*' (I haven't decided
3060 * which but should not make any difference).
a6080a0a 3061 * Feeding the same new and old to diff_change()
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3062 * also has the same effect.
3063 * Before the final output happens, they are pruned after
3064 * merged into rename/copy pairs as appropriate.
3065 */
3066 if (options->reverse_diff)
3067 addremove = (addremove == '+' ? '-' :
3068 addremove == '-' ? '+' : addremove);
3069
3070 if (!path) path = "";
3071 sprintf(concatpath, "%s%s", base, path);
3072 one = alloc_filespec(concatpath);
3073 two = alloc_filespec(concatpath);
3074
3075 if (addremove != '+')
3076 fill_filespec(one, sha1, mode);
3077 if (addremove != '-')
3078 fill_filespec(two, sha1, mode);
3079
3080 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3081 options->has_changes = 1;
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3082}
3083
3084void diff_change(struct diff_options *options,
3085 unsigned old_mode, unsigned new_mode,
3086 const unsigned char *old_sha1,
3087 const unsigned char *new_sha1,
a6080a0a 3088 const char *base, const char *path)
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3089{
3090 char concatpath[PATH_MAX];
3091 struct diff_filespec *one, *two;
3092
3093 if (options->reverse_diff) {
3094 unsigned tmp;
3095 const unsigned char *tmp_c;
3096 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3097 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3098 }
3099 if (!path) path = "";
3100 sprintf(concatpath, "%s%s", base, path);
3101 one = alloc_filespec(concatpath);
3102 two = alloc_filespec(concatpath);
3103 fill_filespec(one, old_sha1, old_mode);
3104 fill_filespec(two, new_sha1, new_mode);
3105
3106 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3107 options->has_changes = 1;
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3108}
3109
3110void diff_unmerge(struct diff_options *options,
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3111 const char *path,
3112 unsigned mode, const unsigned char *sha1)
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3113{
3114 struct diff_filespec *one, *two;
3115 one = alloc_filespec(path);
3116 two = alloc_filespec(path);
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JH
3117 fill_filespec(one, sha1, mode);
3118 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3119}