Future-proof source for changes in xdemitconf_t
[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 */
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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
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32};
33
801235c5
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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;
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48 if (!strcasecmp(var+ofs, "whitespace"))
49 return DIFF_WHITESPACE;
801235c5
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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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110 return 0;
111 }
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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
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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]);
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131 return 0;
132 }
f1af60bd 133
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134 return git_default_config(var, value);
135}
136
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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);
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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
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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;
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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,
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258 struct diff_filespec *two,
259 int color_diff)
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260{
261 int lc_a, lc_b;
1a9eb3b9 262 const char *name_a_tab, *name_b_tab;
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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
JH
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
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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
30b25010 393 memset(&xecfg, 0, sizeof(xecfg));
f59a59e2
JS
394 minus.size = diff_words->minus.text.size;
395 minus.ptr = xmalloc(minus.size);
396 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
397 for (i = 0; i < minus.size; i++)
398 if (isspace(minus.ptr[i]))
399 minus.ptr[i] = '\n';
400 diff_words->minus.current = 0;
401
402 plus.size = diff_words->plus.text.size;
403 plus.ptr = xmalloc(plus.size);
404 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
405 for (i = 0; i < plus.size; i++)
406 if (isspace(plus.ptr[i]))
407 plus.ptr[i] = '\n';
408 diff_words->plus.current = 0;
409
410 xpp.flags = XDF_NEED_MINIMAL;
411 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
f59a59e2
JS
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
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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 }
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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
29a3eefd 1105 if (!attr_diff) {
8c701249 1106 attr_diff = git_attr("diff", 4);
29a3eefd
JH
1107 }
1108 check[0].attr = attr_diff;
8c701249
JH
1109}
1110
29a3eefd 1111static void diff_filespec_check_attr(struct diff_filespec *one)
6973dcae 1112{
29a3eefd 1113 struct git_attr_check attr_diff_check[1];
8c701249 1114
29a3eefd
JH
1115 if (one->checked_attr)
1116 return;
1117
1118 setup_diff_attr_check(attr_diff_check);
1119 one->is_binary = 0;
1120
1121 if (!git_checkattr(one->path, ARRAY_SIZE(attr_diff_check), attr_diff_check)) {
1122 const char *value;
1123
1124 /* binaryness */
1125 value = attr_diff_check[0].value;
515106fa 1126 if (ATTR_TRUE(value))
29a3eefd 1127 ;
515106fa 1128 else if (ATTR_FALSE(value))
29a3eefd 1129 one->is_binary = 1;
515106fa 1130 }
40250af4 1131
29a3eefd 1132 if (!one->data && DIFF_FILE_VALID(one))
8c701249 1133 diff_populate_filespec(one, 0);
29a3eefd
JH
1134
1135 if (one->data)
1136 one->is_binary = buffer_is_binary(one->data, one->size);
1137
1138}
1139
1140int diff_filespec_is_binary(struct diff_filespec *one)
1141{
1142 diff_filespec_check_attr(one);
1143 return one->is_binary;
6973dcae
JH
1144}
1145
1146static void builtin_diff(const char *name_a,
1147 const char *name_b,
1148 struct diff_filespec *one,
1149 struct diff_filespec *two,
1150 const char *xfrm_msg,
051308f6 1151 struct diff_options *o,
6973dcae
JH
1152 int complete_rewrite)
1153{
1154 mmfile_t mf1, mf2;
1155 const char *lbl[2];
1156 char *a_one, *b_two;
ce436973
JK
1157 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1158 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
6973dcae 1159
50892777
JH
1160 a_one = quote_two("a/", name_a + (*name_a == '/'));
1161 b_two = quote_two("b/", name_b + (*name_b == '/'));
6973dcae
JH
1162 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1163 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
50f575fc 1164 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1165 if (lbl[0][0] == '/') {
1166 /* /dev/null */
50f575fc
LT
1167 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1168 if (xfrm_msg && xfrm_msg[0])
1169 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1170 }
1171 else if (lbl[1][0] == '/') {
50f575fc
LT
1172 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1173 if (xfrm_msg && xfrm_msg[0])
1174 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1175 }
1176 else {
1177 if (one->mode != two->mode) {
50f575fc
LT
1178 printf("%sold mode %06o%s\n", set, one->mode, reset);
1179 printf("%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1180 }
50f575fc
LT
1181 if (xfrm_msg && xfrm_msg[0])
1182 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1183 /*
1184 * we do not run diff between different kind
1185 * of objects.
1186 */
1187 if ((one->mode ^ two->mode) & S_IFMT)
1188 goto free_ab_and_return;
1189 if (complete_rewrite) {
13e36ec5
JS
1190 emit_rewrite_diff(name_a, name_b, one, two,
1191 o->color_diff);
34a5e1a2 1192 o->found_changes = 1;
6973dcae
JH
1193 goto free_ab_and_return;
1194 }
1195 }
1196
1197 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1198 die("unable to read files to diff");
1199
29a3eefd
JH
1200 if (!o->text &&
1201 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
0660626c
JH
1202 /* Quite common confusing case */
1203 if (mf1.size == mf2.size &&
1204 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1205 goto free_ab_and_return;
1206 if (o->binary)
051308f6
JH
1207 emit_binary_diff(&mf1, &mf2);
1208 else
1209 printf("Binary files %s and %s differ\n",
1210 lbl[0], lbl[1]);
34a5e1a2 1211 o->found_changes = 1;
051308f6 1212 }
6973dcae
JH
1213 else {
1214 /* Crazy xdl interfaces.. */
1215 const char *diffopts = getenv("GIT_DIFF_OPTS");
1216 xpparam_t xpp;
1217 xdemitconf_t xecfg;
1218 xdemitcb_t ecb;
1219 struct emit_callback ecbdata;
1220
30b25010 1221 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1222 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1223 ecbdata.label_path = lbl;
cd112cef 1224 ecbdata.color_diff = o->color_diff;
34a5e1a2 1225 ecbdata.found_changesp = &o->found_changes;
0d21efa5 1226 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1227 xecfg.ctxlen = o->context;
6973dcae
JH
1228 xecfg.flags = XDL_EMIT_FUNCNAMES;
1229 if (!diffopts)
1230 ;
cc44c765 1231 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1232 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1233 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1234 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1235 ecb.outf = xdiff_outf;
6973dcae 1236 ecb.priv = &ecbdata;
cd112cef 1237 ecbdata.xm.consume = fn_out_consume;
f59a59e2
JS
1238 if (o->color_diff_words)
1239 ecbdata.diff_words =
1240 xcalloc(1, sizeof(struct diff_words_data));
6973dcae 1241 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
f59a59e2
JS
1242 if (o->color_diff_words)
1243 free_diff_words_data(&ecbdata);
6973dcae
JH
1244 }
1245
1246 free_ab_and_return:
fc3abdf5
JH
1247 diff_free_filespec_data(one);
1248 diff_free_filespec_data(two);
6973dcae
JH
1249 free(a_one);
1250 free(b_two);
1251 return;
1252}
1253
1254static void builtin_diffstat(const char *name_a, const char *name_b,
1255 struct diff_filespec *one,
1256 struct diff_filespec *two,
710158e3 1257 struct diffstat_t *diffstat,
0d21efa5 1258 struct diff_options *o,
710158e3 1259 int complete_rewrite)
6973dcae
JH
1260{
1261 mmfile_t mf1, mf2;
1262 struct diffstat_file *data;
1263
1264 data = diffstat_add(diffstat, name_a, name_b);
1265
1266 if (!one || !two) {
1267 data->is_unmerged = 1;
1268 return;
1269 }
710158e3
JH
1270 if (complete_rewrite) {
1271 diff_populate_filespec(one, 0);
1272 diff_populate_filespec(two, 0);
1273 data->deleted = count_lines(one->data, one->size);
1274 data->added = count_lines(two->data, two->size);
fc3abdf5 1275 goto free_and_return;
710158e3 1276 }
6973dcae
JH
1277 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1278 die("unable to read files to diff");
1279
29a3eefd 1280 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
6973dcae 1281 data->is_binary = 1;
b1882587
AP
1282 data->added = mf2.size;
1283 data->deleted = mf1.size;
1284 } else {
6973dcae
JH
1285 /* Crazy xdl interfaces.. */
1286 xpparam_t xpp;
1287 xdemitconf_t xecfg;
1288 xdemitcb_t ecb;
1289
30b25010 1290 memset(&xecfg, 0, sizeof(xecfg));
0d21efa5 1291 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1292 ecb.outf = xdiff_outf;
1293 ecb.priv = diffstat;
1294 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1295 }
fc3abdf5
JH
1296
1297 free_and_return:
1298 diff_free_filespec_data(one);
1299 diff_free_filespec_data(two);
6973dcae
JH
1300}
1301
88246898
JS
1302static void builtin_checkdiff(const char *name_a, const char *name_b,
1303 struct diff_filespec *one,
c5a8c3ec 1304 struct diff_filespec *two, struct diff_options *o)
88246898
JS
1305{
1306 mmfile_t mf1, mf2;
1307 struct checkdiff_t data;
1308
1309 if (!two)
1310 return;
1311
1312 memset(&data, 0, sizeof(data));
1313 data.xm.consume = checkdiff_consume;
1314 data.filename = name_b ? name_b : name_a;
1315 data.lineno = 0;
c5a8c3ec 1316 data.color_diff = o->color_diff;
88246898
JS
1317
1318 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1319 die("unable to read files to diff");
1320
29a3eefd 1321 if (diff_filespec_is_binary(two))
fc3abdf5 1322 goto free_and_return;
88246898
JS
1323 else {
1324 /* Crazy xdl interfaces.. */
1325 xpparam_t xpp;
1326 xdemitconf_t xecfg;
1327 xdemitcb_t ecb;
1328
30b25010 1329 memset(&xecfg, 0, sizeof(xecfg));
88246898 1330 xpp.flags = XDF_NEED_MINIMAL;
88246898
JS
1331 ecb.outf = xdiff_outf;
1332 ecb.priv = &data;
1333 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1334 }
fc3abdf5
JH
1335 free_and_return:
1336 diff_free_filespec_data(one);
1337 diff_free_filespec_data(two);
88246898
JS
1338}
1339
6973dcae
JH
1340struct diff_filespec *alloc_filespec(const char *path)
1341{
1342 int namelen = strlen(path);
1343 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1344
1345 memset(spec, 0, sizeof(*spec));
1346 spec->path = (char *)(spec + 1);
1347 memcpy(spec->path, path, namelen+1);
1348 return spec;
1349}
1350
1351void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1352 unsigned short mode)
1353{
1354 if (mode) {
1355 spec->mode = canon_mode(mode);
e702496e 1356 hashcpy(spec->sha1, sha1);
0bef57ee 1357 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1358 }
1359}
1360
1361/*
5adf317b 1362 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
1363 * the work tree has that object contents, return true, so that
1364 * prepare_temp_file() does not have to inflate and extract.
1365 */
1510fea7 1366static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1367{
1368 struct cache_entry *ce;
1369 struct stat st;
1370 int pos, len;
1371
1372 /* We do not read the cache ourselves here, because the
1373 * benchmark with my previous version that always reads cache
1374 * shows that it makes things worse for diff-tree comparing
1375 * two linux-2.6 kernel trees in an already checked out work
1376 * tree. This is because most diff-tree comparisons deal with
1377 * only a small number of files, while reading the cache is
1378 * expensive for a large project, and its cost outweighs the
1379 * savings we get by not inflating the object to a temporary
1380 * file. Practically, this code only helps when we are used
1381 * by diff-cache --cached, which does read the cache before
1382 * calling us.
1383 */
1384 if (!active_cache)
1385 return 0;
1386
1510fea7
SP
1387 /* We want to avoid the working directory if our caller
1388 * doesn't need the data in a normal file, this system
1389 * is rather slow with its stat/open/mmap/close syscalls,
1390 * and the object is contained in a pack file. The pack
1391 * is probably already open and will be faster to obtain
1392 * the data through than the working directory. Loose
1393 * objects however would tend to be slower as they need
1394 * to be individually opened and inflated.
1395 */
5caf9232 1396 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1397 return 0;
1398
6973dcae
JH
1399 len = strlen(name);
1400 pos = cache_name_pos(name, len);
1401 if (pos < 0)
1402 return 0;
1403 ce = active_cache[pos];
1404 if ((lstat(name, &st) < 0) ||
1405 !S_ISREG(st.st_mode) || /* careful! */
1406 ce_match_stat(ce, &st, 0) ||
a89fccd2 1407 hashcmp(sha1, ce->sha1))
6973dcae
JH
1408 return 0;
1409 /* we return 1 only when we can stat, it is a regular file,
1410 * stat information matches, and sha1 recorded in the cache
1411 * matches. I.e. we know the file in the work tree really is
1412 * the same as the <name, sha1> pair.
1413 */
1414 return 1;
1415}
1416
3afaa72d
JH
1417static int populate_from_stdin(struct diff_filespec *s)
1418{
1419#define INCREMENT 1024
1420 char *buf;
1421 unsigned long size;
8a912bcb 1422 ssize_t got;
3afaa72d
JH
1423
1424 size = 0;
1425 buf = NULL;
1426 while (1) {
1427 buf = xrealloc(buf, size + INCREMENT);
1428 got = xread(0, buf + size, INCREMENT);
1429 if (!got)
1430 break; /* EOF */
1431 if (got < 0)
1432 return error("error while reading from stdin %s",
1433 strerror(errno));
1434 size += got;
1435 }
1436 s->should_munmap = 0;
1437 s->data = buf;
1438 s->size = size;
1439 s->should_free = 1;
1440 return 0;
1441}
1442
04786756
LT
1443static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1444{
1445 int len;
1446 char *data = xmalloc(100);
1447 len = snprintf(data, 100,
1448 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1449 s->data = data;
1450 s->size = len;
1451 s->should_free = 1;
1452 if (size_only) {
1453 s->data = NULL;
1454 free(data);
1455 }
1456 return 0;
1457}
1458
6973dcae
JH
1459/*
1460 * While doing rename detection and pickaxe operation, we may need to
1461 * grab the data for the blob (or file) for our own in-core comparison.
1462 * diff_filespec has data and size fields for this purpose.
1463 */
1464int diff_populate_filespec(struct diff_filespec *s, int size_only)
1465{
1466 int err = 0;
1467 if (!DIFF_FILE_VALID(s))
1468 die("internal error: asking to populate invalid file.");
1469 if (S_ISDIR(s->mode))
1470 return -1;
1471
6973dcae 1472 if (s->data)
fc3abdf5 1473 return 0;
04786756 1474
6e0b8ed6
JH
1475 if (size_only && 0 < s->size)
1476 return 0;
1477
302b9282 1478 if (S_ISGITLINK(s->mode))
04786756
LT
1479 return diff_populate_gitlink(s, size_only);
1480
6973dcae 1481 if (!s->sha1_valid ||
1510fea7 1482 reuse_worktree_file(s->path, s->sha1, 0)) {
6973dcae
JH
1483 struct stat st;
1484 int fd;
6c510bee
LT
1485 char *buf;
1486 unsigned long size;
1487
3afaa72d
JH
1488 if (!strcmp(s->path, "-"))
1489 return populate_from_stdin(s);
1490
6973dcae
JH
1491 if (lstat(s->path, &st) < 0) {
1492 if (errno == ENOENT) {
1493 err_empty:
1494 err = -1;
1495 empty:
d2543b8e 1496 s->data = (char *)"";
6973dcae
JH
1497 s->size = 0;
1498 return err;
1499 }
1500 }
dc49cd76 1501 s->size = xsize_t(st.st_size);
6973dcae
JH
1502 if (!s->size)
1503 goto empty;
1504 if (size_only)
1505 return 0;
1506 if (S_ISLNK(st.st_mode)) {
1507 int ret;
1508 s->data = xmalloc(s->size);
1509 s->should_free = 1;
1510 ret = readlink(s->path, s->data, s->size);
1511 if (ret < 0) {
1512 free(s->data);
1513 goto err_empty;
1514 }
1515 return 0;
1516 }
1517 fd = open(s->path, O_RDONLY);
1518 if (fd < 0)
1519 goto err_empty;
c4712e45 1520 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1521 close(fd);
6973dcae 1522 s->should_munmap = 1;
6c510bee
LT
1523
1524 /*
1525 * Convert from working tree format to canonical git format
1526 */
6c510bee 1527 size = s->size;
ac78e548
AR
1528 buf = convert_to_git(s->path, s->data, &size);
1529 if (buf) {
6c510bee
LT
1530 munmap(s->data, s->size);
1531 s->should_munmap = 0;
1532 s->data = buf;
1533 s->size = size;
1534 s->should_free = 1;
1535 }
6973dcae
JH
1536 }
1537 else {
21666f1a 1538 enum object_type type;
6e0b8ed6 1539 if (size_only)
21666f1a 1540 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1541 else {
21666f1a 1542 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1543 s->should_free = 1;
1544 }
1545 }
1546 return 0;
1547}
1548
1549void diff_free_filespec_data(struct diff_filespec *s)
1550{
1551 if (s->should_free)
1552 free(s->data);
1553 else if (s->should_munmap)
1554 munmap(s->data, s->size);
fc3abdf5
JH
1555
1556 if (s->should_free || s->should_munmap) {
1557 s->should_free = s->should_munmap = 0;
1558 s->data = NULL;
1559 }
6973dcae
JH
1560 free(s->cnt_data);
1561 s->cnt_data = NULL;
1562}
1563
1564static void prep_temp_blob(struct diff_tempfile *temp,
1565 void *blob,
1566 unsigned long size,
1567 const unsigned char *sha1,
1568 int mode)
1569{
1570 int fd;
1571
1472966c 1572 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae
JH
1573 if (fd < 0)
1574 die("unable to create temp-file");
93822c22 1575 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1576 die("unable to write temp-file");
1577 close(fd);
1578 temp->name = temp->tmp_path;
1579 strcpy(temp->hex, sha1_to_hex(sha1));
1580 temp->hex[40] = 0;
1581 sprintf(temp->mode, "%06o", mode);
1582}
1583
1584static void prepare_temp_file(const char *name,
1585 struct diff_tempfile *temp,
1586 struct diff_filespec *one)
1587{
1588 if (!DIFF_FILE_VALID(one)) {
1589 not_a_valid_file:
1590 /* A '-' entry produces this for file-2, and
1591 * a '+' entry produces this for file-1.
1592 */
1593 temp->name = "/dev/null";
1594 strcpy(temp->hex, ".");
1595 strcpy(temp->mode, ".");
1596 return;
1597 }
1598
1599 if (!one->sha1_valid ||
1510fea7 1600 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1601 struct stat st;
1602 if (lstat(name, &st) < 0) {
1603 if (errno == ENOENT)
1604 goto not_a_valid_file;
1605 die("stat(%s): %s", name, strerror(errno));
1606 }
1607 if (S_ISLNK(st.st_mode)) {
1608 int ret;
1609 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1610 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1611 if (sizeof(buf) <= st.st_size)
1612 die("symlink too long: %s", name);
dc49cd76 1613 ret = readlink(name, buf, sz);
6973dcae
JH
1614 if (ret < 0)
1615 die("readlink(%s)", name);
dc49cd76 1616 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1617 (one->sha1_valid ?
1618 one->sha1 : null_sha1),
1619 (one->sha1_valid ?
1620 one->mode : S_IFLNK));
1621 }
1622 else {
1623 /* we can borrow from the file in the work tree */
1624 temp->name = name;
1625 if (!one->sha1_valid)
1626 strcpy(temp->hex, sha1_to_hex(null_sha1));
1627 else
1628 strcpy(temp->hex, sha1_to_hex(one->sha1));
1629 /* Even though we may sometimes borrow the
1630 * contents from the work tree, we always want
1631 * one->mode. mode is trustworthy even when
1632 * !(one->sha1_valid), as long as
1633 * DIFF_FILE_VALID(one).
1634 */
1635 sprintf(temp->mode, "%06o", one->mode);
1636 }
1637 return;
1638 }
1639 else {
1640 if (diff_populate_filespec(one, 0))
1641 die("cannot read data blob for %s", one->path);
1642 prep_temp_blob(temp, one->data, one->size,
1643 one->sha1, one->mode);
1644 }
1645}
1646
1647static void remove_tempfile(void)
1648{
1649 int i;
1650
1651 for (i = 0; i < 2; i++)
1652 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1653 unlink(diff_temp[i].name);
1654 diff_temp[i].name = NULL;
1655 }
1656}
1657
1658static void remove_tempfile_on_signal(int signo)
1659{
1660 remove_tempfile();
1661 signal(SIGINT, SIG_DFL);
1662 raise(signo);
1663}
1664
1665static int spawn_prog(const char *pgm, const char **arg)
1666{
1667 pid_t pid;
1668 int status;
1669
1670 fflush(NULL);
1671 pid = fork();
1672 if (pid < 0)
1673 die("unable to fork");
1674 if (!pid) {
1675 execvp(pgm, (char *const*) arg);
1676 exit(255);
1677 }
1678
1679 while (waitpid(pid, &status, 0) < 0) {
1680 if (errno == EINTR)
1681 continue;
1682 return -1;
1683 }
1684
1685 /* Earlier we did not check the exit status because
1686 * diff exits non-zero if files are different, and
1687 * we are not interested in knowing that. It was a
1688 * mistake which made it harder to quit a diff-*
1689 * session that uses the git-apply-patch-script as
1690 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1691 * should also exit non-zero only when it wants to
1692 * abort the entire diff-* session.
1693 */
1694 if (WIFEXITED(status) && !WEXITSTATUS(status))
1695 return 0;
1696 return -1;
1697}
1698
1699/* An external diff command takes:
1700 *
1701 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1702 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1703 *
1704 */
1705static void run_external_diff(const char *pgm,
1706 const char *name,
1707 const char *other,
1708 struct diff_filespec *one,
1709 struct diff_filespec *two,
1710 const char *xfrm_msg,
1711 int complete_rewrite)
1712{
1713 const char *spawn_arg[10];
1714 struct diff_tempfile *temp = diff_temp;
1715 int retval;
1716 static int atexit_asked = 0;
1717 const char *othername;
1718 const char **arg = &spawn_arg[0];
1719
1720 othername = (other? other : name);
1721 if (one && two) {
1722 prepare_temp_file(name, &temp[0], one);
1723 prepare_temp_file(othername, &temp[1], two);
1724 if (! atexit_asked &&
1725 (temp[0].name == temp[0].tmp_path ||
1726 temp[1].name == temp[1].tmp_path)) {
1727 atexit_asked = 1;
1728 atexit(remove_tempfile);
1729 }
1730 signal(SIGINT, remove_tempfile_on_signal);
1731 }
1732
1733 if (one && two) {
1734 *arg++ = pgm;
1735 *arg++ = name;
1736 *arg++ = temp[0].name;
1737 *arg++ = temp[0].hex;
1738 *arg++ = temp[0].mode;
1739 *arg++ = temp[1].name;
1740 *arg++ = temp[1].hex;
1741 *arg++ = temp[1].mode;
1742 if (other) {
1743 *arg++ = other;
1744 *arg++ = xfrm_msg;
1745 }
1746 } else {
1747 *arg++ = pgm;
1748 *arg++ = name;
1749 }
1750 *arg = NULL;
1751 retval = spawn_prog(pgm, spawn_arg);
1752 remove_tempfile();
1753 if (retval) {
1754 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1755 exit(1);
1756 }
1757}
1758
f1af60bd
JH
1759static const char *external_diff_attr(const char *name)
1760{
1761 struct git_attr_check attr_diff_check;
1762
1763 setup_diff_attr_check(&attr_diff_check);
1764 if (!git_checkattr(name, 1, &attr_diff_check)) {
1765 const char *value = attr_diff_check.value;
1766 if (!ATTR_TRUE(value) &&
1767 !ATTR_FALSE(value) &&
1768 !ATTR_UNSET(value)) {
1769 struct ll_diff_driver *drv;
1770
1771 if (!user_diff_tail) {
1772 user_diff_tail = &user_diff;
1773 git_config(git_diff_ui_config);
1774 }
1775 for (drv = user_diff; drv; drv = drv->next)
1776 if (!strcmp(drv->name, value))
1777 return drv->cmd;
1778 }
1779 }
1780 return NULL;
1781}
1782
6973dcae
JH
1783static void run_diff_cmd(const char *pgm,
1784 const char *name,
1785 const char *other,
1786 struct diff_filespec *one,
1787 struct diff_filespec *two,
1788 const char *xfrm_msg,
051308f6 1789 struct diff_options *o,
6973dcae
JH
1790 int complete_rewrite)
1791{
f1af60bd
JH
1792 if (!o->allow_external)
1793 pgm = NULL;
1794 else {
1795 const char *cmd = external_diff_attr(name);
1796 if (cmd)
1797 pgm = cmd;
1798 }
1799
6973dcae
JH
1800 if (pgm) {
1801 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1802 complete_rewrite);
1803 return;
1804 }
1805 if (one && two)
1806 builtin_diff(name, other ? other : name,
051308f6 1807 one, two, xfrm_msg, o, complete_rewrite);
6973dcae
JH
1808 else
1809 printf("* Unmerged path %s\n", name);
1810}
1811
1812static void diff_fill_sha1_info(struct diff_filespec *one)
1813{
1814 if (DIFF_FILE_VALID(one)) {
1815 if (!one->sha1_valid) {
1816 struct stat st;
5332b2af
JS
1817 if (!strcmp(one->path, "-")) {
1818 hashcpy(one->sha1, null_sha1);
1819 return;
1820 }
6973dcae
JH
1821 if (lstat(one->path, &st) < 0)
1822 die("stat %s", one->path);
1823 if (index_path(one->sha1, one->path, &st, 0))
1824 die("cannot hash %s\n", one->path);
1825 }
1826 }
1827 else
e702496e 1828 hashclr(one->sha1);
6973dcae
JH
1829}
1830
125b7630
RS
1831static int similarity_index(struct diff_filepair *p)
1832{
1833 return p->score * 100 / MAX_SCORE;
1834}
1835
6973dcae
JH
1836static void run_diff(struct diff_filepair *p, struct diff_options *o)
1837{
1838 const char *pgm = external_diff();
1839 char msg[PATH_MAX*2+300], *xfrm_msg;
1840 struct diff_filespec *one;
1841 struct diff_filespec *two;
1842 const char *name;
1843 const char *other;
1844 char *name_munged, *other_munged;
1845 int complete_rewrite = 0;
1846 int len;
1847
1848 if (DIFF_PAIR_UNMERGED(p)) {
1849 /* unmerged */
051308f6 1850 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
6973dcae
JH
1851 return;
1852 }
1853
1854 name = p->one->path;
1855 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1856 name_munged = quote_one(name);
1857 other_munged = quote_one(other);
1858 one = p->one; two = p->two;
1859
1860 diff_fill_sha1_info(one);
1861 diff_fill_sha1_info(two);
1862
1863 len = 0;
1864 switch (p->status) {
1865 case DIFF_STATUS_COPIED:
1866 len += snprintf(msg + len, sizeof(msg) - len,
1867 "similarity index %d%%\n"
1868 "copy from %s\n"
1869 "copy to %s\n",
125b7630 1870 similarity_index(p), name_munged, other_munged);
6973dcae
JH
1871 break;
1872 case DIFF_STATUS_RENAMED:
1873 len += snprintf(msg + len, sizeof(msg) - len,
1874 "similarity index %d%%\n"
1875 "rename from %s\n"
1876 "rename to %s\n",
125b7630 1877 similarity_index(p), name_munged, other_munged);
6973dcae
JH
1878 break;
1879 case DIFF_STATUS_MODIFIED:
1880 if (p->score) {
1881 len += snprintf(msg + len, sizeof(msg) - len,
1882 "dissimilarity index %d%%\n",
125b7630 1883 similarity_index(p));
6973dcae
JH
1884 complete_rewrite = 1;
1885 break;
1886 }
1887 /* fallthru */
1888 default:
1889 /* nothing */
1890 ;
1891 }
1892
a89fccd2 1893 if (hashcmp(one->sha1, two->sha1)) {
6973dcae 1894 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
6973dcae 1895
82793c55
JH
1896 if (o->binary) {
1897 mmfile_t mf;
29a3eefd
JH
1898 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
1899 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
82793c55
JH
1900 abbrev = 40;
1901 }
6973dcae
JH
1902 len += snprintf(msg + len, sizeof(msg) - len,
1903 "index %.*s..%.*s",
dcb3450f
LT
1904 abbrev, sha1_to_hex(one->sha1),
1905 abbrev, sha1_to_hex(two->sha1));
6973dcae
JH
1906 if (one->mode == two->mode)
1907 len += snprintf(msg + len, sizeof(msg) - len,
1908 " %06o", one->mode);
1909 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1910 }
1911
1912 if (len)
1913 msg[--len] = 0;
1914 xfrm_msg = len ? msg : NULL;
1915
1916 if (!pgm &&
1917 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1918 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1919 /* a filepair that changes between file and symlink
1920 * needs to be split into deletion and creation.
1921 */
1922 struct diff_filespec *null = alloc_filespec(two->path);
051308f6 1923 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
6973dcae
JH
1924 free(null);
1925 null = alloc_filespec(one->path);
051308f6 1926 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
6973dcae
JH
1927 free(null);
1928 }
1929 else
051308f6 1930 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
6973dcae
JH
1931 complete_rewrite);
1932
1933 free(name_munged);
1934 free(other_munged);
1935}
1936
1937static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1938 struct diffstat_t *diffstat)
1939{
1940 const char *name;
1941 const char *other;
710158e3 1942 int complete_rewrite = 0;
6973dcae
JH
1943
1944 if (DIFF_PAIR_UNMERGED(p)) {
1945 /* unmerged */
0d21efa5 1946 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
1947 return;
1948 }
1949
1950 name = p->one->path;
1951 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1952
1953 diff_fill_sha1_info(p->one);
1954 diff_fill_sha1_info(p->two);
1955
710158e3
JH
1956 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1957 complete_rewrite = 1;
0d21efa5 1958 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
1959}
1960
88246898
JS
1961static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1962{
1963 const char *name;
1964 const char *other;
1965
1966 if (DIFF_PAIR_UNMERGED(p)) {
1967 /* unmerged */
1968 return;
1969 }
1970
1971 name = p->one->path;
1972 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1973
1974 diff_fill_sha1_info(p->one);
1975 diff_fill_sha1_info(p->two);
1976
c5a8c3ec 1977 builtin_checkdiff(name, other, p->one, p->two, o);
88246898
JS
1978}
1979
6973dcae
JH
1980void diff_setup(struct diff_options *options)
1981{
1982 memset(options, 0, sizeof(*options));
6973dcae
JH
1983 options->line_termination = '\n';
1984 options->break_opt = -1;
1985 options->rename_limit = -1;
ee1e5412 1986 options->context = 3;
3969cf7d 1987 options->msg_sep = "";
6973dcae
JH
1988
1989 options->change = diff_change;
1990 options->add_remove = diff_addremove;
801235c5 1991 options->color_diff = diff_use_color_default;
b68ea12e 1992 options->detect_rename = diff_detect_rename_default;
6973dcae
JH
1993}
1994
1995int diff_setup_done(struct diff_options *options)
1996{
d7de00f7
TH
1997 int count = 0;
1998
1999 if (options->output_format & DIFF_FORMAT_NAME)
2000 count++;
2001 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2002 count++;
2003 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2004 count++;
2005 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2006 count++;
2007 if (count > 1)
2008 die("--name-only, --name-status, --check and -s are mutually exclusive");
2009
03b9d560
JH
2010 if (options->find_copies_harder)
2011 options->detect_rename = DIFF_DETECT_COPY;
2012
c6744349
TH
2013 if (options->output_format & (DIFF_FORMAT_NAME |
2014 DIFF_FORMAT_NAME_STATUS |
2015 DIFF_FORMAT_CHECKDIFF |
2016 DIFF_FORMAT_NO_OUTPUT))
2017 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2018 DIFF_FORMAT_NUMSTAT |
c6744349 2019 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2020 DIFF_FORMAT_SHORTSTAT |
c6744349
TH
2021 DIFF_FORMAT_SUMMARY |
2022 DIFF_FORMAT_PATCH);
2023
6973dcae
JH
2024 /*
2025 * These cases always need recursive; we do not drop caller-supplied
2026 * recursive bits for other formats here.
2027 */
c6744349 2028 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2029 DIFF_FORMAT_NUMSTAT |
c6744349 2030 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2031 DIFF_FORMAT_SHORTSTAT |
d7014dc0 2032 DIFF_FORMAT_SUMMARY |
c6744349 2033 DIFF_FORMAT_CHECKDIFF))
6973dcae 2034 options->recursive = 1;
5e363541 2035 /*
3969cf7d 2036 * Also pickaxe would not work very well if you do not say recursive
5e363541 2037 */
3969cf7d
JH
2038 if (options->pickaxe)
2039 options->recursive = 1;
5e363541 2040
6973dcae
JH
2041 if (options->detect_rename && options->rename_limit < 0)
2042 options->rename_limit = diff_rename_limit_default;
2043 if (options->setup & DIFF_SETUP_USE_CACHE) {
2044 if (!active_cache)
2045 /* read-cache does not die even when it fails
2046 * so it is safe for us to do this here. Also
2047 * it does not smudge active_cache or active_nr
2048 * when it fails, so we do not have to worry about
2049 * cleaning it up ourselves either.
2050 */
2051 read_cache();
2052 }
6973dcae
JH
2053 if (options->abbrev <= 0 || 40 < options->abbrev)
2054 options->abbrev = 40; /* full */
2055
68aacb2f
JH
2056 /*
2057 * It does not make sense to show the first hit we happened
2058 * to have found. It does not make sense not to return with
2059 * exit code in such a case either.
2060 */
2061 if (options->quiet) {
2062 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2063 options->exit_with_status = 1;
2064 }
2065
2066 /*
2067 * If we postprocess in diffcore, we cannot simply return
2068 * upon the first hit. We need to run diff as usual.
2069 */
2070 if (options->pickaxe || options->filter)
2071 options->quiet = 0;
2072
6973dcae
JH
2073 return 0;
2074}
2075
d2543b8e 2076static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2077{
2078 char c, *eq;
2079 int len;
2080
2081 if (*arg != '-')
2082 return 0;
2083 c = *++arg;
2084 if (!c)
2085 return 0;
2086 if (c == arg_short) {
2087 c = *++arg;
2088 if (!c)
2089 return 1;
2090 if (val && isdigit(c)) {
2091 char *end;
2092 int n = strtoul(arg, &end, 10);
2093 if (*end)
2094 return 0;
2095 *val = n;
2096 return 1;
2097 }
2098 return 0;
2099 }
2100 if (c != '-')
2101 return 0;
2102 arg++;
2103 eq = strchr(arg, '=');
2104 if (eq)
2105 len = eq - arg;
2106 else
2107 len = strlen(arg);
2108 if (!len || strncmp(arg, arg_long, len))
2109 return 0;
2110 if (eq) {
2111 int n;
2112 char *end;
2113 if (!isdigit(*++eq))
2114 return 0;
2115 n = strtoul(eq, &end, 10);
2116 if (*end)
2117 return 0;
2118 *val = n;
2119 }
2120 return 1;
2121}
2122
16befb8b
JH
2123static int diff_scoreopt_parse(const char *opt);
2124
6973dcae
JH
2125int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2126{
2127 const char *arg = av[0];
2128 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2129 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2130 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2131 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2132 else if (!strcmp(arg, "--raw"))
2133 options->output_format |= DIFF_FORMAT_RAW;
6973dcae 2134 else if (!strcmp(arg, "--patch-with-raw")) {
c6744349 2135 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
6973dcae 2136 }
74e2abe5
JH
2137 else if (!strcmp(arg, "--numstat")) {
2138 options->output_format |= DIFF_FORMAT_NUMSTAT;
2139 }
ebd124c6
NP
2140 else if (!strcmp(arg, "--shortstat")) {
2141 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2142 }
cc44c765 2143 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2144 char *end;
2145 int width = options->stat_width;
2146 int name_width = options->stat_name_width;
2147 arg += 6;
2148 end = (char *)arg;
2149
2150 switch (*arg) {
2151 case '-':
cc44c765 2152 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2153 width = strtoul(arg + 7, &end, 10);
cc44c765 2154 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2155 name_width = strtoul(arg + 12, &end, 10);
2156 break;
2157 case '=':
2158 width = strtoul(arg+1, &end, 10);
2159 if (*end == ',')
2160 name_width = strtoul(end+1, &end, 10);
2161 }
2162
2163 /* Important! This checks all the error cases! */
2164 if (*end)
2165 return 0;
c6744349 2166 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2167 options->stat_name_width = name_width;
2168 options->stat_width = width;
a2540023 2169 }
88246898 2170 else if (!strcmp(arg, "--check"))
c6744349 2171 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4bbd261b 2172 else if (!strcmp(arg, "--summary"))
c6744349 2173 options->output_format |= DIFF_FORMAT_SUMMARY;
6973dcae 2174 else if (!strcmp(arg, "--patch-with-stat")) {
c6744349 2175 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
6973dcae
JH
2176 }
2177 else if (!strcmp(arg, "-z"))
2178 options->line_termination = 0;
cc44c765 2179 else if (!prefixcmp(arg, "-l"))
6973dcae
JH
2180 options->rename_limit = strtoul(arg+2, NULL, 10);
2181 else if (!strcmp(arg, "--full-index"))
2182 options->full_index = 1;
0660626c 2183 else if (!strcmp(arg, "--binary")) {
c6744349 2184 options->output_format |= DIFF_FORMAT_PATCH;
82793c55 2185 options->binary = 1;
0660626c 2186 }
63ac4501 2187 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
6d64ea96
SF
2188 options->text = 1;
2189 }
6973dcae 2190 else if (!strcmp(arg, "--name-only"))
c6744349 2191 options->output_format |= DIFF_FORMAT_NAME;
6973dcae 2192 else if (!strcmp(arg, "--name-status"))
c6744349 2193 options->output_format |= DIFF_FORMAT_NAME_STATUS;
6973dcae
JH
2194 else if (!strcmp(arg, "-R"))
2195 options->reverse_diff = 1;
cc44c765 2196 else if (!prefixcmp(arg, "-S"))
6973dcae 2197 options->pickaxe = arg + 2;
c6744349
TH
2198 else if (!strcmp(arg, "-s")) {
2199 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2200 }
cc44c765 2201 else if (!prefixcmp(arg, "-O"))
6973dcae 2202 options->orderfile = arg + 2;
cc44c765 2203 else if (!prefixcmp(arg, "--diff-filter="))
6973dcae
JH
2204 options->filter = arg + 14;
2205 else if (!strcmp(arg, "--pickaxe-all"))
2206 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2207 else if (!strcmp(arg, "--pickaxe-regex"))
2208 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
cc44c765 2209 else if (!prefixcmp(arg, "-B")) {
6973dcae
JH
2210 if ((options->break_opt =
2211 diff_scoreopt_parse(arg)) == -1)
2212 return -1;
2213 }
cc44c765 2214 else if (!prefixcmp(arg, "-M")) {
6973dcae
JH
2215 if ((options->rename_score =
2216 diff_scoreopt_parse(arg)) == -1)
2217 return -1;
2218 options->detect_rename = DIFF_DETECT_RENAME;
2219 }
cc44c765 2220 else if (!prefixcmp(arg, "-C")) {
ca6c0970
JS
2221 if (options->detect_rename == DIFF_DETECT_COPY)
2222 options->find_copies_harder = 1;
6973dcae
JH
2223 if ((options->rename_score =
2224 diff_scoreopt_parse(arg)) == -1)
2225 return -1;
2226 options->detect_rename = DIFF_DETECT_COPY;
2227 }
2228 else if (!strcmp(arg, "--find-copies-harder"))
2229 options->find_copies_harder = 1;
750f7b66
LT
2230 else if (!strcmp(arg, "--follow"))
2231 options->follow_renames = 1;
6973dcae
JH
2232 else if (!strcmp(arg, "--abbrev"))
2233 options->abbrev = DEFAULT_ABBREV;
cc44c765 2234 else if (!prefixcmp(arg, "--abbrev=")) {
6973dcae
JH
2235 options->abbrev = strtoul(arg + 9, NULL, 10);
2236 if (options->abbrev < MINIMUM_ABBREV)
2237 options->abbrev = MINIMUM_ABBREV;
2238 else if (40 < options->abbrev)
2239 options->abbrev = 40;
2240 }
cd112cef
JS
2241 else if (!strcmp(arg, "--color"))
2242 options->color_diff = 1;
fef88bb0
JH
2243 else if (!strcmp(arg, "--no-color"))
2244 options->color_diff = 0;
0d21efa5
JS
2245 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2246 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2247 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2248 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
859f9c45
JS
2249 else if (!strcmp(arg, "--ignore-space-at-eol"))
2250 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
f59a59e2
JS
2251 else if (!strcmp(arg, "--color-words"))
2252 options->color_diff = options->color_diff_words = 1;
b68ea12e
EW
2253 else if (!strcmp(arg, "--no-renames"))
2254 options->detect_rename = 0;
41bbf9d5
AR
2255 else if (!strcmp(arg, "--exit-code"))
2256 options->exit_with_status = 1;
68aacb2f
JH
2257 else if (!strcmp(arg, "--quiet"))
2258 options->quiet = 1;
72909bef
JS
2259 else if (!strcmp(arg, "--ext-diff"))
2260 options->allow_external = 1;
2261 else if (!strcmp(arg, "--no-ext-diff"))
2262 options->allow_external = 0;
6973dcae
JH
2263 else
2264 return 0;
2265 return 1;
2266}
2267
2268static int parse_num(const char **cp_p)
2269{
2270 unsigned long num, scale;
2271 int ch, dot;
2272 const char *cp = *cp_p;
2273
2274 num = 0;
2275 scale = 1;
2276 dot = 0;
2277 for(;;) {
2278 ch = *cp;
2279 if ( !dot && ch == '.' ) {
2280 scale = 1;
2281 dot = 1;
2282 } else if ( ch == '%' ) {
2283 scale = dot ? scale*100 : 100;
2284 cp++; /* % is always at the end */
2285 break;
2286 } else if ( ch >= '0' && ch <= '9' ) {
2287 if ( scale < 100000 ) {
2288 scale *= 10;
2289 num = (num*10) + (ch-'0');
2290 }
2291 } else {
2292 break;
2293 }
2294 cp++;
2295 }
2296 *cp_p = cp;
2297
2298 /* user says num divided by scale and we say internally that
2299 * is MAX_SCORE * num / scale.
2300 */
dc49cd76 2301 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2302}
2303
16befb8b 2304static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2305{
2306 int opt1, opt2, cmd;
2307
2308 if (*opt++ != '-')
2309 return -1;
2310 cmd = *opt++;
2311 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2312 return -1; /* that is not a -M, -C nor -B option */
2313
2314 opt1 = parse_num(&opt);
2315 if (cmd != 'B')
2316 opt2 = 0;
2317 else {
2318 if (*opt == 0)
2319 opt2 = 0;
2320 else if (*opt != '/')
2321 return -1; /* we expect -B80/99 or -B80 */
2322 else {
2323 opt++;
2324 opt2 = parse_num(&opt);
2325 }
2326 }
2327 if (*opt != 0)
2328 return -1;
2329 return opt1 | (opt2 << 16);
2330}
2331
2332struct diff_queue_struct diff_queued_diff;
2333
2334void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2335{
2336 if (queue->alloc <= queue->nr) {
2337 queue->alloc = alloc_nr(queue->alloc);
2338 queue->queue = xrealloc(queue->queue,
2339 sizeof(dp) * queue->alloc);
2340 }
2341 queue->queue[queue->nr++] = dp;
2342}
2343
2344struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2345 struct diff_filespec *one,
2346 struct diff_filespec *two)
2347{
ef677686 2348 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2349 dp->one = one;
2350 dp->two = two;
6973dcae
JH
2351 if (queue)
2352 diff_q(queue, dp);
2353 return dp;
2354}
2355
2356void diff_free_filepair(struct diff_filepair *p)
2357{
2358 diff_free_filespec_data(p->one);
2359 diff_free_filespec_data(p->two);
2360 free(p->one);
2361 free(p->two);
2362 free(p);
2363}
2364
2365/* This is different from find_unique_abbrev() in that
2366 * it stuffs the result with dots for alignment.
2367 */
2368const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2369{
2370 int abblen;
2371 const char *abbrev;
2372 if (len == 40)
2373 return sha1_to_hex(sha1);
2374
2375 abbrev = find_unique_abbrev(sha1, len);
2376 if (!abbrev)
2377 return sha1_to_hex(sha1);
2378 abblen = strlen(abbrev);
2379 if (abblen < 37) {
2380 static char hex[41];
2381 if (len < abblen && abblen <= len + 2)
2382 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2383 else
2384 sprintf(hex, "%s...", abbrev);
2385 return hex;
2386 }
2387 return sha1_to_hex(sha1);
2388}
2389
2390static void diff_flush_raw(struct diff_filepair *p,
c6744349 2391 struct diff_options *options)
6973dcae
JH
2392{
2393 int two_paths;
2394 char status[10];
2395 int abbrev = options->abbrev;
2396 const char *path_one, *path_two;
c6744349
TH
2397 int inter_name_termination = '\t';
2398 int line_termination = options->line_termination;
2399
2400 if (!line_termination)
2401 inter_name_termination = 0;
6973dcae
JH
2402
2403 path_one = p->one->path;
2404 path_two = p->two->path;
2405 if (line_termination) {
2406 path_one = quote_one(path_one);
2407 path_two = quote_one(path_two);
2408 }
2409
2410 if (p->score)
125b7630 2411 sprintf(status, "%c%03d", p->status, similarity_index(p));
6973dcae
JH
2412 else {
2413 status[0] = p->status;
2414 status[1] = 0;
2415 }
2416 switch (p->status) {
2417 case DIFF_STATUS_COPIED:
2418 case DIFF_STATUS_RENAMED:
2419 two_paths = 1;
2420 break;
2421 case DIFF_STATUS_ADDED:
2422 case DIFF_STATUS_DELETED:
2423 two_paths = 0;
2424 break;
2425 default:
2426 two_paths = 0;
2427 break;
2428 }
c6744349 2429 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
6973dcae
JH
2430 printf(":%06o %06o %s ",
2431 p->one->mode, p->two->mode,
2432 diff_unique_abbrev(p->one->sha1, abbrev));
2433 printf("%s ",
2434 diff_unique_abbrev(p->two->sha1, abbrev));
2435 }
3cb56738
JS
2436 printf("%s%c%s", status, inter_name_termination,
2437 two_paths || p->one->mode ? path_one : path_two);
6973dcae
JH
2438 if (two_paths)
2439 printf("%c%s", inter_name_termination, path_two);
2440 putchar(line_termination);
2441 if (path_one != p->one->path)
2442 free((void*)path_one);
2443 if (path_two != p->two->path)
2444 free((void*)path_two);
2445}
2446
471efb09 2447static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
6973dcae
JH
2448{
2449 char *path = p->two->path;
2450
471efb09 2451 if (opt->line_termination)
6973dcae 2452 path = quote_one(p->two->path);
471efb09 2453 printf("%s%c", path, opt->line_termination);
6973dcae
JH
2454 if (p->two->path != path)
2455 free(path);
2456}
2457
2458int diff_unmodified_pair(struct diff_filepair *p)
2459{
2460 /* This function is written stricter than necessary to support
2461 * the currently implemented transformers, but the idea is to
2462 * let transformers to produce diff_filepairs any way they want,
2463 * and filter and clean them up here before producing the output.
2464 */
2465 struct diff_filespec *one, *two;
2466
2467 if (DIFF_PAIR_UNMERGED(p))
2468 return 0; /* unmerged is interesting */
2469
2470 one = p->one;
2471 two = p->two;
2472
2473 /* deletion, addition, mode or type change
2474 * and rename are all interesting.
2475 */
2476 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2477 DIFF_PAIR_MODE_CHANGED(p) ||
2478 strcmp(one->path, two->path))
2479 return 0;
2480
2481 /* both are valid and point at the same path. that is, we are
2482 * dealing with a change.
2483 */
2484 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2485 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2486 return 1; /* no change */
2487 if (!one->sha1_valid && !two->sha1_valid)
2488 return 1; /* both look at the same file on the filesystem. */
2489 return 0;
2490}
2491
2492static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2493{
2494 if (diff_unmodified_pair(p))
2495 return;
2496
2497 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2498 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2499 return; /* no tree diffs in patch format */
2500
2501 run_diff(p, o);
2502}
2503
2504static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2505 struct diffstat_t *diffstat)
2506{
2507 if (diff_unmodified_pair(p))
2508 return;
2509
2510 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2511 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2512 return; /* no tree diffs in patch format */
2513
2514 run_diffstat(p, o, diffstat);
2515}
2516
88246898
JS
2517static void diff_flush_checkdiff(struct diff_filepair *p,
2518 struct diff_options *o)
2519{
2520 if (diff_unmodified_pair(p))
2521 return;
2522
2523 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2524 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2525 return; /* no tree diffs in patch format */
2526
2527 run_checkdiff(p, o);
2528}
2529
6973dcae
JH
2530int diff_queue_is_empty(void)
2531{
2532 struct diff_queue_struct *q = &diff_queued_diff;
2533 int i;
2534 for (i = 0; i < q->nr; i++)
2535 if (!diff_unmodified_pair(q->queue[i]))
2536 return 0;
2537 return 1;
2538}
2539
2540#if DIFF_DEBUG
2541void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2542{
2543 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2544 x, one ? one : "",
2545 s->path,
2546 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2547 s->mode,
2548 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2549 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2550 x, one ? one : "",
2551 s->size, s->xfrm_flags);
2552}
2553
2554void diff_debug_filepair(const struct diff_filepair *p, int i)
2555{
2556 diff_debug_filespec(p->one, i, "one");
2557 diff_debug_filespec(p->two, i, "two");
2558 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2559 p->score, p->status ? p->status : '?',
2560 p->source_stays, p->broken_pair);
2561}
2562
2563void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2564{
2565 int i;
2566 if (msg)
2567 fprintf(stderr, "%s\n", msg);
2568 fprintf(stderr, "q->nr = %d\n", q->nr);
2569 for (i = 0; i < q->nr; i++) {
2570 struct diff_filepair *p = q->queue[i];
2571 diff_debug_filepair(p, i);
2572 }
2573}
2574#endif
2575
2576static void diff_resolve_rename_copy(void)
2577{
2578 int i, j;
2579 struct diff_filepair *p, *pp;
2580 struct diff_queue_struct *q = &diff_queued_diff;
2581
2582 diff_debug_queue("resolve-rename-copy", q);
2583
2584 for (i = 0; i < q->nr; i++) {
2585 p = q->queue[i];
2586 p->status = 0; /* undecided */
2587 if (DIFF_PAIR_UNMERGED(p))
2588 p->status = DIFF_STATUS_UNMERGED;
2589 else if (!DIFF_FILE_VALID(p->one))
2590 p->status = DIFF_STATUS_ADDED;
2591 else if (!DIFF_FILE_VALID(p->two))
2592 p->status = DIFF_STATUS_DELETED;
2593 else if (DIFF_PAIR_TYPE_CHANGED(p))
2594 p->status = DIFF_STATUS_TYPE_CHANGED;
2595
2596 /* from this point on, we are dealing with a pair
2597 * whose both sides are valid and of the same type, i.e.
2598 * either in-place edit or rename/copy edit.
2599 */
2600 else if (DIFF_PAIR_RENAME(p)) {
2601 if (p->source_stays) {
2602 p->status = DIFF_STATUS_COPIED;
2603 continue;
2604 }
2605 /* See if there is some other filepair that
2606 * copies from the same source as us. If so
2607 * we are a copy. Otherwise we are either a
2608 * copy if the path stays, or a rename if it
2609 * does not, but we already handled "stays" case.
2610 */
2611 for (j = i + 1; j < q->nr; j++) {
2612 pp = q->queue[j];
2613 if (strcmp(pp->one->path, p->one->path))
2614 continue; /* not us */
2615 if (!DIFF_PAIR_RENAME(pp))
2616 continue; /* not a rename/copy */
2617 /* pp is a rename/copy from the same source */
2618 p->status = DIFF_STATUS_COPIED;
2619 break;
2620 }
2621 if (!p->status)
2622 p->status = DIFF_STATUS_RENAMED;
2623 }
a89fccd2 2624 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2625 p->one->mode != p->two->mode ||
2626 is_null_sha1(p->one->sha1))
6973dcae
JH
2627 p->status = DIFF_STATUS_MODIFIED;
2628 else {
2629 /* This is a "no-change" entry and should not
2630 * happen anymore, but prepare for broken callers.
2631 */
2632 error("feeding unmodified %s to diffcore",
2633 p->one->path);
2634 p->status = DIFF_STATUS_UNKNOWN;
2635 }
2636 }
2637 diff_debug_queue("resolve-rename-copy done", q);
2638}
2639
c6744349 2640static int check_pair_status(struct diff_filepair *p)
6973dcae 2641{
6973dcae
JH
2642 switch (p->status) {
2643 case DIFF_STATUS_UNKNOWN:
c6744349 2644 return 0;
6973dcae
JH
2645 case 0:
2646 die("internal error in diff-resolve-rename-copy");
6973dcae 2647 default:
c6744349 2648 return 1;
6973dcae
JH
2649 }
2650}
2651
c6744349
TH
2652static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2653{
2654 int fmt = opt->output_format;
2655
2656 if (fmt & DIFF_FORMAT_CHECKDIFF)
2657 diff_flush_checkdiff(p, opt);
2658 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2659 diff_flush_raw(p, opt);
2660 else if (fmt & DIFF_FORMAT_NAME)
471efb09 2661 diff_flush_name(p, opt);
c6744349
TH
2662}
2663
4bbd261b
SE
2664static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2665{
0d26a64e 2666 char *name = quote_one(fs->path);
4bbd261b 2667 if (fs->mode)
0d26a64e 2668 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
4bbd261b 2669 else
0d26a64e
AJ
2670 printf(" %s %s\n", newdelete, name);
2671 free(name);
4bbd261b
SE
2672}
2673
2674
2675static void show_mode_change(struct diff_filepair *p, int show_name)
2676{
2677 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
0d26a64e
AJ
2678 if (show_name) {
2679 char *name = quote_one(p->two->path);
4bbd261b 2680 printf(" mode change %06o => %06o %s\n",
0d26a64e
AJ
2681 p->one->mode, p->two->mode, name);
2682 free(name);
2683 }
4bbd261b
SE
2684 else
2685 printf(" mode change %06o => %06o\n",
2686 p->one->mode, p->two->mode);
2687 }
2688}
2689
2690static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2691{
b9f44164 2692 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2693
125b7630 2694 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 2695 free(names);
4bbd261b
SE
2696 show_mode_change(p, 0);
2697}
2698
2699static void diff_summary(struct diff_filepair *p)
2700{
2701 switch(p->status) {
2702 case DIFF_STATUS_DELETED:
2703 show_file_mode_name("delete", p->one);
2704 break;
2705 case DIFF_STATUS_ADDED:
2706 show_file_mode_name("create", p->two);
2707 break;
2708 case DIFF_STATUS_COPIED:
2709 show_rename_copy("copy", p);
2710 break;
2711 case DIFF_STATUS_RENAMED:
2712 show_rename_copy("rename", p);
2713 break;
2714 default:
2715 if (p->score) {
0d26a64e
AJ
2716 char *name = quote_one(p->two->path);
2717 printf(" rewrite %s (%d%%)\n", name,
125b7630 2718 similarity_index(p));
0d26a64e 2719 free(name);
4bbd261b
SE
2720 show_mode_change(p, 0);
2721 } else show_mode_change(p, 1);
2722 break;
2723 }
2724}
2725
fcb3d0ad
JS
2726struct patch_id_t {
2727 struct xdiff_emit_state xm;
2728 SHA_CTX *ctx;
2729 int patchlen;
2730};
2731
2732static int remove_space(char *line, int len)
2733{
2734 int i;
2735 char *dst = line;
2736 unsigned char c;
2737
2738 for (i = 0; i < len; i++)
2739 if (!isspace((c = line[i])))
2740 *dst++ = c;
2741
2742 return dst - line;
2743}
2744
2745static void patch_id_consume(void *priv, char *line, unsigned long len)
2746{
2747 struct patch_id_t *data = priv;
2748 int new_len;
2749
2750 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 2751 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
2752 return;
2753
2754 new_len = remove_space(line, len);
2755
2756 SHA1_Update(data->ctx, line, new_len);
2757 data->patchlen += new_len;
2758}
2759
2760/* returns 0 upon success, and writes result into sha1 */
2761static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2762{
2763 struct diff_queue_struct *q = &diff_queued_diff;
2764 int i;
2765 SHA_CTX ctx;
2766 struct patch_id_t data;
2767 char buffer[PATH_MAX * 4 + 20];
2768
2769 SHA1_Init(&ctx);
2770 memset(&data, 0, sizeof(struct patch_id_t));
2771 data.ctx = &ctx;
2772 data.xm.consume = patch_id_consume;
2773
2774 for (i = 0; i < q->nr; i++) {
2775 xpparam_t xpp;
2776 xdemitconf_t xecfg;
2777 xdemitcb_t ecb;
2778 mmfile_t mf1, mf2;
2779 struct diff_filepair *p = q->queue[i];
2780 int len1, len2;
2781
30b25010 2782 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
2783 if (p->status == 0)
2784 return error("internal diff status error");
2785 if (p->status == DIFF_STATUS_UNKNOWN)
2786 continue;
2787 if (diff_unmodified_pair(p))
2788 continue;
2789 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2790 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2791 continue;
2792 if (DIFF_PAIR_UNMERGED(p))
2793 continue;
2794
2795 diff_fill_sha1_info(p->one);
2796 diff_fill_sha1_info(p->two);
2797 if (fill_mmfile(&mf1, p->one) < 0 ||
2798 fill_mmfile(&mf2, p->two) < 0)
2799 return error("unable to read files to diff");
2800
2801 /* Maybe hash p->two? into the patch id? */
29a3eefd 2802 if (diff_filespec_is_binary(p->two))
fcb3d0ad
JS
2803 continue;
2804
2805 len1 = remove_space(p->one->path, strlen(p->one->path));
2806 len2 = remove_space(p->two->path, strlen(p->two->path));
2807 if (p->one->mode == 0)
2808 len1 = snprintf(buffer, sizeof(buffer),
2809 "diff--gita/%.*sb/%.*s"
2810 "newfilemode%06o"
2811 "---/dev/null"
2812 "+++b/%.*s",
2813 len1, p->one->path,
2814 len2, p->two->path,
2815 p->two->mode,
2816 len2, p->two->path);
2817 else if (p->two->mode == 0)
2818 len1 = snprintf(buffer, sizeof(buffer),
2819 "diff--gita/%.*sb/%.*s"
2820 "deletedfilemode%06o"
2821 "---a/%.*s"
2822 "+++/dev/null",
2823 len1, p->one->path,
2824 len2, p->two->path,
2825 p->one->mode,
2826 len1, p->one->path);
2827 else
2828 len1 = snprintf(buffer, sizeof(buffer),
2829 "diff--gita/%.*sb/%.*s"
2830 "---a/%.*s"
2831 "+++b/%.*s",
2832 len1, p->one->path,
2833 len2, p->two->path,
2834 len1, p->one->path,
2835 len2, p->two->path);
2836 SHA1_Update(&ctx, buffer, len1);
2837
2838 xpp.flags = XDF_NEED_MINIMAL;
2839 xecfg.ctxlen = 3;
9fdc3bb5 2840 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
2841 ecb.outf = xdiff_outf;
2842 ecb.priv = &data;
2843 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2844 }
2845
2846 SHA1_Final(sha1, &ctx);
2847 return 0;
2848}
2849
2850int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2851{
2852 struct diff_queue_struct *q = &diff_queued_diff;
2853 int i;
2854 int result = diff_get_patch_id(options, sha1);
2855
2856 for (i = 0; i < q->nr; i++)
2857 diff_free_filepair(q->queue[i]);
2858
2859 free(q->queue);
2860 q->queue = NULL;
2861 q->nr = q->alloc = 0;
2862
2863 return result;
2864}
2865
946c3784 2866static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 2867{
6973dcae 2868 int i;
6973dcae 2869
946c3784
TH
2870 for (i = 0; i < q->nr; i++) {
2871 const struct diff_filepair *p = q->queue[i];
2872
2873 switch (p->status) {
2874 case DIFF_STATUS_DELETED:
2875 case DIFF_STATUS_ADDED:
2876 case DIFF_STATUS_COPIED:
2877 case DIFF_STATUS_RENAMED:
2878 return 0;
2879 default:
2880 if (p->score)
2881 return 0;
2882 if (p->one->mode && p->two->mode &&
2883 p->one->mode != p->two->mode)
2884 return 0;
2885 break;
2886 }
6973dcae 2887 }
946c3784
TH
2888 return 1;
2889}
2890
6973dcae
JH
2891void diff_flush(struct diff_options *options)
2892{
2893 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 2894 int i, output_format = options->output_format;
946c3784 2895 int separator = 0;
6973dcae 2896
c6744349
TH
2897 /*
2898 * Order: raw, stat, summary, patch
2899 * or: name/name-status/checkdiff (other bits clear)
2900 */
946c3784
TH
2901 if (!q->nr)
2902 goto free_queue;
6973dcae 2903
c6744349
TH
2904 if (output_format & (DIFF_FORMAT_RAW |
2905 DIFF_FORMAT_NAME |
2906 DIFF_FORMAT_NAME_STATUS |
2907 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
2908 for (i = 0; i < q->nr; i++) {
2909 struct diff_filepair *p = q->queue[i];
c6744349
TH
2910 if (check_pair_status(p))
2911 flush_one_pair(p, options);
6973dcae 2912 }
946c3784 2913 separator++;
6973dcae 2914 }
c6744349 2915
ebd124c6 2916 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 2917 struct diffstat_t diffstat;
c6744349 2918
5e2b0636
TH
2919 memset(&diffstat, 0, sizeof(struct diffstat_t));
2920 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
2921 for (i = 0; i < q->nr; i++) {
2922 struct diff_filepair *p = q->queue[i];
c6744349 2923 if (check_pair_status(p))
5e2b0636 2924 diff_flush_stat(p, options, &diffstat);
6973dcae 2925 }
74e2abe5
JH
2926 if (output_format & DIFF_FORMAT_NUMSTAT)
2927 show_numstat(&diffstat, options);
2928 if (output_format & DIFF_FORMAT_DIFFSTAT)
2929 show_stats(&diffstat, options);
ebd124c6
NP
2930 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2931 show_shortstats(&diffstat);
3969cf7d 2932 separator++;
6973dcae
JH
2933 }
2934
946c3784 2935 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349
TH
2936 for (i = 0; i < q->nr; i++)
2937 diff_summary(q->queue[i]);
3969cf7d 2938 separator++;
6973dcae
JH
2939 }
2940
c6744349 2941 if (output_format & DIFF_FORMAT_PATCH) {
946c3784
TH
2942 if (separator) {
2943 if (options->stat_sep) {
2944 /* attach patch instead of inline */
c6744349 2945 fputs(options->stat_sep, stdout);
946c3784 2946 } else {
c6744349 2947 putchar(options->line_termination);
946c3784 2948 }
c6744349
TH
2949 }
2950
2951 for (i = 0; i < q->nr; i++) {
2952 struct diff_filepair *p = q->queue[i];
2953 if (check_pair_status(p))
2954 diff_flush_patch(p, options);
2955 }
4bbd261b
SE
2956 }
2957
04245581
JK
2958 if (output_format & DIFF_FORMAT_CALLBACK)
2959 options->format_callback(q, options, options->format_callback_data);
2960
c6744349
TH
2961 for (i = 0; i < q->nr; i++)
2962 diff_free_filepair(q->queue[i]);
946c3784 2963free_queue:
6973dcae
JH
2964 free(q->queue);
2965 q->queue = NULL;
2966 q->nr = q->alloc = 0;
2967}
2968
2969static void diffcore_apply_filter(const char *filter)
2970{
2971 int i;
2972 struct diff_queue_struct *q = &diff_queued_diff;
2973 struct diff_queue_struct outq;
2974 outq.queue = NULL;
2975 outq.nr = outq.alloc = 0;
2976
2977 if (!filter)
2978 return;
2979
2980 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2981 int found;
2982 for (i = found = 0; !found && i < q->nr; i++) {
2983 struct diff_filepair *p = q->queue[i];
2984 if (((p->status == DIFF_STATUS_MODIFIED) &&
2985 ((p->score &&
2986 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2987 (!p->score &&
2988 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2989 ((p->status != DIFF_STATUS_MODIFIED) &&
2990 strchr(filter, p->status)))
2991 found++;
2992 }
2993 if (found)
2994 return;
2995
2996 /* otherwise we will clear the whole queue
2997 * by copying the empty outq at the end of this
2998 * function, but first clear the current entries
2999 * in the queue.
3000 */
3001 for (i = 0; i < q->nr; i++)
3002 diff_free_filepair(q->queue[i]);
3003 }
3004 else {
3005 /* Only the matching ones */
3006 for (i = 0; i < q->nr; i++) {
3007 struct diff_filepair *p = q->queue[i];
3008
3009 if (((p->status == DIFF_STATUS_MODIFIED) &&
3010 ((p->score &&
3011 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3012 (!p->score &&
3013 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3014 ((p->status != DIFF_STATUS_MODIFIED) &&
3015 strchr(filter, p->status)))
3016 diff_q(&outq, p);
3017 else
3018 diff_free_filepair(p);
3019 }
3020 }
3021 free(q->queue);
3022 *q = outq;
3023}
3024
3025void diffcore_std(struct diff_options *options)
3026{
68aacb2f
JH
3027 if (options->quiet)
3028 return;
706098af 3029
6973dcae
JH
3030 if (options->break_opt != -1)
3031 diffcore_break(options->break_opt);
3032 if (options->detect_rename)
3033 diffcore_rename(options);
3034 if (options->break_opt != -1)
3035 diffcore_merge_broken();
3036 if (options->pickaxe)
3037 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3038 if (options->orderfile)
3039 diffcore_order(options->orderfile);
3040 diff_resolve_rename_copy();
3041 diffcore_apply_filter(options->filter);
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3042
3043 options->has_changes = !!diff_queued_diff.nr;
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3044}
3045
3046
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3047void diff_addremove(struct diff_options *options,
3048 int addremove, unsigned mode,
3049 const unsigned char *sha1,
3050 const char *base, const char *path)
3051{
3052 char concatpath[PATH_MAX];
3053 struct diff_filespec *one, *two;
3054
3055 /* This may look odd, but it is a preparation for
3056 * feeding "there are unchanged files which should
3057 * not produce diffs, but when you are doing copy
3058 * detection you would need them, so here they are"
3059 * entries to the diff-core. They will be prefixed
3060 * with something like '=' or '*' (I haven't decided
3061 * which but should not make any difference).
a6080a0a 3062 * Feeding the same new and old to diff_change()
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3063 * also has the same effect.
3064 * Before the final output happens, they are pruned after
3065 * merged into rename/copy pairs as appropriate.
3066 */
3067 if (options->reverse_diff)
3068 addremove = (addremove == '+' ? '-' :
3069 addremove == '-' ? '+' : addremove);
3070
3071 if (!path) path = "";
3072 sprintf(concatpath, "%s%s", base, path);
3073 one = alloc_filespec(concatpath);
3074 two = alloc_filespec(concatpath);
3075
3076 if (addremove != '+')
3077 fill_filespec(one, sha1, mode);
3078 if (addremove != '-')
3079 fill_filespec(two, sha1, mode);
3080
3081 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3082 options->has_changes = 1;
6973dcae
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3083}
3084
3085void diff_change(struct diff_options *options,
3086 unsigned old_mode, unsigned new_mode,
3087 const unsigned char *old_sha1,
3088 const unsigned char *new_sha1,
a6080a0a 3089 const char *base, const char *path)
6973dcae
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3090{
3091 char concatpath[PATH_MAX];
3092 struct diff_filespec *one, *two;
3093
3094 if (options->reverse_diff) {
3095 unsigned tmp;
3096 const unsigned char *tmp_c;
3097 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3098 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3099 }
3100 if (!path) path = "";
3101 sprintf(concatpath, "%s%s", base, path);
3102 one = alloc_filespec(concatpath);
3103 two = alloc_filespec(concatpath);
3104 fill_filespec(one, old_sha1, old_mode);
3105 fill_filespec(two, new_sha1, new_mode);
3106
3107 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3108 options->has_changes = 1;
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3109}
3110
3111void diff_unmerge(struct diff_options *options,
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3112 const char *path,
3113 unsigned mode, const unsigned char *sha1)
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3114{
3115 struct diff_filespec *one, *two;
3116 one = alloc_filespec(path);
3117 two = alloc_filespec(path);
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3118 fill_filespec(one, sha1, mode);
3119 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3120}