Add "--dirstat" for some directory statistics
[git/git.git] / diff.c
CommitLineData
6973dcae
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
6973dcae
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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"
d5535ec7 12#include "run-command.h"
23707811 13#include "utf8.h"
6973dcae 14
1510fea7
SP
15#ifdef NO_FAST_WORKING_DIRECTORY
16#define FAST_WORKING_DIRECTORY 0
17#else
18#define FAST_WORKING_DIRECTORY 1
19#endif
20
96f1e58f 21static int diff_detect_rename_default;
0024a549 22static int diff_rename_limit_default = 100;
96f1e58f 23static int diff_use_color_default;
cbe02100 24static const char *external_diff_cmd_cfg;
aecbf914 25int diff_auto_refresh_index = 1;
6973dcae 26
7c92fe0e 27static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 28 "\033[m", /* reset */
448c3ef1
JH
29 "", /* PLAIN (normal) */
30 "\033[1m", /* METAINFO (bold) */
31 "\033[36m", /* FRAGINFO (cyan) */
32 "\033[31m", /* OLD (red) */
33 "\033[32m", /* NEW (green) */
34 "\033[33m", /* COMMIT (yellow) */
35 "\033[41m", /* WHITESPACE (red background) */
cd112cef
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36};
37
801235c5
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38static int parse_diff_color_slot(const char *var, int ofs)
39{
40 if (!strcasecmp(var+ofs, "plain"))
41 return DIFF_PLAIN;
42 if (!strcasecmp(var+ofs, "meta"))
43 return DIFF_METAINFO;
44 if (!strcasecmp(var+ofs, "frag"))
45 return DIFF_FRAGINFO;
46 if (!strcasecmp(var+ofs, "old"))
47 return DIFF_FILE_OLD;
48 if (!strcasecmp(var+ofs, "new"))
49 return DIFF_FILE_NEW;
ce436973
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50 if (!strcasecmp(var+ofs, "commit"))
51 return DIFF_COMMIT;
448c3ef1
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52 if (!strcasecmp(var+ofs, "whitespace"))
53 return DIFF_WHITESPACE;
801235c5
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54 die("bad config variable '%s'", var);
55}
56
f1af60bd
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57static struct ll_diff_driver {
58 const char *name;
59 struct ll_diff_driver *next;
60 char *cmd;
61} *user_diff, **user_diff_tail;
62
63/*
64 * Currently there is only "diff.<drivername>.command" variable;
65 * because there are "diff.color.<slot>" variables, we are parsing
66 * this in a bit convoluted way to allow low level diff driver
67 * called "color".
68 */
69static int parse_lldiff_command(const char *var, const char *ep, const char *value)
70{
71 const char *name;
72 int namelen;
73 struct ll_diff_driver *drv;
74
75 name = var + 5;
76 namelen = ep - name;
77 for (drv = user_diff; drv; drv = drv->next)
78 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
79 break;
80 if (!drv) {
f1af60bd 81 drv = xcalloc(1, sizeof(struct ll_diff_driver));
182af834 82 drv->name = xmemdupz(name, namelen);
f1af60bd
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83 if (!user_diff_tail)
84 user_diff_tail = &user_diff;
85 *user_diff_tail = drv;
86 user_diff_tail = &(drv->next);
87 }
88
89 if (!value)
90 return error("%s: lacks value", var);
91 drv->cmd = strdup(value);
92 return 0;
93}
94
e0e324a4
JH
95/*
96 * 'diff.<what>.funcname' attribute can be specified in the configuration
97 * to define a customized regexp to find the beginning of a function to
98 * be used for hunk header lines of "diff -p" style output.
99 */
100static struct funcname_pattern {
101 char *name;
102 char *pattern;
103 struct funcname_pattern *next;
104} *funcname_pattern_list;
105
106static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
107{
108 const char *name;
109 int namelen;
110 struct funcname_pattern *pp;
111
112 name = var + 5; /* "diff." */
113 namelen = ep - name;
114
115 for (pp = funcname_pattern_list; pp; pp = pp->next)
116 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
117 break;
118 if (!pp) {
e0e324a4 119 pp = xcalloc(1, sizeof(*pp));
182af834 120 pp->name = xmemdupz(name, namelen);
e0e324a4
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121 pp->next = funcname_pattern_list;
122 funcname_pattern_list = pp;
123 }
124 if (pp->pattern)
125 free(pp->pattern);
126 pp->pattern = xstrdup(value);
127 return 0;
128}
129
83ad63cf
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130/*
131 * These are to give UI layer defaults.
132 * The core-level commands such as git-diff-files should
133 * never be affected by the setting of diff.renames
134 * the user happens to have in the configuration file.
135 */
136int git_diff_ui_config(const char *var, const char *value)
801235c5
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137{
138 if (!strcmp(var, "diff.renamelimit")) {
139 diff_rename_limit_default = git_config_int(var, value);
140 return 0;
141 }
a159ca0c 142 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
0f6f5a40 143 diff_use_color_default = git_config_colorbool(var, value, -1);
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144 return 0;
145 }
b68ea12e
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146 if (!strcmp(var, "diff.renames")) {
147 if (!value)
148 diff_detect_rename_default = DIFF_DETECT_RENAME;
149 else if (!strcasecmp(value, "copies") ||
150 !strcasecmp(value, "copy"))
151 diff_detect_rename_default = DIFF_DETECT_COPY;
152 else if (git_config_bool(var,value))
153 diff_detect_rename_default = DIFF_DETECT_RENAME;
154 return 0;
155 }
aecbf914
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156 if (!strcmp(var, "diff.autorefreshindex")) {
157 diff_auto_refresh_index = git_config_bool(var, value);
158 return 0;
159 }
cbe02100 160 if (!strcmp(var, "diff.external")) {
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161 if (!value)
162 return config_error_nonbool(var);
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163 external_diff_cmd_cfg = xstrdup(value);
164 return 0;
165 }
f1af60bd
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166 if (!prefixcmp(var, "diff.")) {
167 const char *ep = strrchr(var, '.');
168
e0e324a4 169 if (ep != var + 4) {
64f30e94
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170 if (!strcmp(ep, ".command")) {
171 if (!value)
172 return config_error_nonbool(var);
e0e324a4 173 return parse_lldiff_command(var, ep, value);
64f30e94 174 }
e0e324a4 175 }
f1af60bd 176 }
9a1805a8
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177
178 return git_diff_basic_config(var, value);
179}
180
181int git_diff_basic_config(const char *var, const char *value)
182{
1968d77d 183 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 184 int slot = parse_diff_color_slot(var, 11);
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185 if (!value)
186 return config_error_nonbool(var);
7c92fe0e 187 color_parse(value, var, diff_colors[slot]);
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188 return 0;
189 }
f1af60bd 190
e467193f
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191 if (!prefixcmp(var, "diff.")) {
192 const char *ep = strrchr(var, '.');
193 if (ep != var + 4) {
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194 if (!strcmp(ep, ".funcname")) {
195 if (!value)
196 return config_error_nonbool(var);
e467193f 197 return parse_funcname_pattern(var, ep, value);
64f30e94 198 }
e467193f
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199 }
200 }
201
801235c5
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202 return git_default_config(var, value);
203}
204
6973dcae
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205static char *quote_two(const char *one, const char *two)
206{
207 int need_one = quote_c_style(one, NULL, NULL, 1);
208 int need_two = quote_c_style(two, NULL, NULL, 1);
663af342 209 struct strbuf res;
6973dcae 210
663af342 211 strbuf_init(&res, 0);
6973dcae 212 if (need_one + need_two) {
663af342
PH
213 strbuf_addch(&res, '"');
214 quote_c_style(one, &res, NULL, 1);
215 quote_c_style(two, &res, NULL, 1);
216 strbuf_addch(&res, '"');
217 } else {
218 strbuf_addstr(&res, one);
219 strbuf_addstr(&res, two);
6973dcae 220 }
b315c5c0 221 return strbuf_detach(&res, NULL);
6973dcae
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222}
223
224static const char *external_diff(void)
225{
226 static const char *external_diff_cmd = NULL;
227 static int done_preparing = 0;
228
229 if (done_preparing)
230 return external_diff_cmd;
231 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
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232 if (!external_diff_cmd)
233 external_diff_cmd = external_diff_cmd_cfg;
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234 done_preparing = 1;
235 return external_diff_cmd;
236}
237
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238static struct diff_tempfile {
239 const char *name; /* filename external diff should read from */
240 char hex[41];
241 char mode[10];
1472966c 242 char tmp_path[PATH_MAX];
6973dcae
JH
243} diff_temp[2];
244
245static int count_lines(const char *data, int size)
246{
247 int count, ch, completely_empty = 1, nl_just_seen = 0;
248 count = 0;
249 while (0 < size--) {
250 ch = *data++;
251 if (ch == '\n') {
252 count++;
253 nl_just_seen = 1;
254 completely_empty = 0;
255 }
256 else {
257 nl_just_seen = 0;
258 completely_empty = 0;
259 }
260 }
261 if (completely_empty)
262 return 0;
263 if (!nl_just_seen)
264 count++; /* no trailing newline */
265 return count;
266}
267
268static void print_line_count(int count)
269{
270 switch (count) {
271 case 0:
272 printf("0,0");
273 break;
274 case 1:
275 printf("1");
276 break;
277 default:
278 printf("1,%d", count);
279 break;
280 }
281}
282
13e36ec5
JS
283static void copy_file(int prefix, const char *data, int size,
284 const char *set, const char *reset)
6973dcae
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285{
286 int ch, nl_just_seen = 1;
287 while (0 < size--) {
288 ch = *data++;
13e36ec5
JS
289 if (nl_just_seen) {
290 fputs(set, stdout);
6973dcae 291 putchar(prefix);
13e36ec5
JS
292 }
293 if (ch == '\n') {
6973dcae 294 nl_just_seen = 1;
13e36ec5
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295 fputs(reset, stdout);
296 } else
6973dcae 297 nl_just_seen = 0;
13e36ec5 298 putchar(ch);
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299 }
300 if (!nl_just_seen)
13e36ec5 301 printf("%s\n\\ No newline at end of file\n", reset);
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302}
303
304static void emit_rewrite_diff(const char *name_a,
305 const char *name_b,
306 struct diff_filespec *one,
13e36ec5 307 struct diff_filespec *two,
eab9a40b 308 struct diff_options *o)
6973dcae
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309{
310 int lc_a, lc_b;
eab9a40b 311 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1a9eb3b9 312 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
313 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
314 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
315 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
316 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
317 const char *reset = diff_get_color(color_diff, DIFF_RESET);
d5625091 318 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1a9eb3b9 319
8a13becc
JH
320 name_a += (*name_a == '/');
321 name_b += (*name_b == '/');
1a9eb3b9
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322 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
323 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
324
d5625091
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325 strbuf_reset(&a_name);
326 strbuf_reset(&b_name);
327 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
328 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
329
6973dcae
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330 diff_populate_filespec(one, 0);
331 diff_populate_filespec(two, 0);
332 lc_a = count_lines(one->data, one->size);
333 lc_b = count_lines(two->data, two->size);
d5625091
JH
334 printf("%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
335 metainfo, a_name.buf, name_a_tab, reset,
336 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
6973dcae
JH
337 print_line_count(lc_a);
338 printf(" +");
339 print_line_count(lc_b);
13e36ec5 340 printf(" @@%s\n", reset);
6973dcae 341 if (lc_a)
13e36ec5 342 copy_file('-', one->data, one->size, old, reset);
6973dcae 343 if (lc_b)
13e36ec5 344 copy_file('+', two->data, two->size, new, reset);
6973dcae
JH
345}
346
347static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
348{
349 if (!DIFF_FILE_VALID(one)) {
d2543b8e 350 mf->ptr = (char *)""; /* does not matter */
6973dcae
JH
351 mf->size = 0;
352 return 0;
353 }
354 else if (diff_populate_filespec(one, 0))
355 return -1;
356 mf->ptr = one->data;
357 mf->size = one->size;
358 return 0;
359}
360
f59a59e2
JS
361struct diff_words_buffer {
362 mmfile_t text;
363 long alloc;
364 long current; /* output pointer */
365 int suppressed_newline;
366};
367
368static void diff_words_append(char *line, unsigned long len,
369 struct diff_words_buffer *buffer)
370{
371 if (buffer->text.size + len > buffer->alloc) {
372 buffer->alloc = (buffer->text.size + len) * 3 / 2;
373 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
374 }
375 line++;
376 len--;
377 memcpy(buffer->text.ptr + buffer->text.size, line, len);
378 buffer->text.size += len;
379}
380
381struct diff_words_data {
382 struct xdiff_emit_state xm;
383 struct diff_words_buffer minus, plus;
384};
385
386static void print_word(struct diff_words_buffer *buffer, int len, int color,
387 int suppress_newline)
388{
389 const char *ptr;
390 int eol = 0;
391
392 if (len == 0)
393 return;
394
395 ptr = buffer->text.ptr + buffer->current;
396 buffer->current += len;
397
398 if (ptr[len - 1] == '\n') {
399 eol = 1;
400 len--;
401 }
402
403 fputs(diff_get_color(1, color), stdout);
404 fwrite(ptr, len, 1, stdout);
405 fputs(diff_get_color(1, DIFF_RESET), stdout);
406
407 if (eol) {
408 if (suppress_newline)
409 buffer->suppressed_newline = 1;
410 else
411 putchar('\n');
412 }
413}
414
415static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
416{
417 struct diff_words_data *diff_words = priv;
418
419 if (diff_words->minus.suppressed_newline) {
420 if (line[0] != '+')
421 putchar('\n');
422 diff_words->minus.suppressed_newline = 0;
423 }
424
425 len--;
426 switch (line[0]) {
427 case '-':
428 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
429 break;
430 case '+':
431 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
432 break;
433 case ' ':
434 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
435 diff_words->minus.current += len;
436 break;
437 }
438}
439
440/* this executes the word diff on the accumulated buffers */
441static void diff_words_show(struct diff_words_data *diff_words)
442{
443 xpparam_t xpp;
444 xdemitconf_t xecfg;
445 xdemitcb_t ecb;
446 mmfile_t minus, plus;
447 int i;
448
30b25010 449 memset(&xecfg, 0, sizeof(xecfg));
f59a59e2
JS
450 minus.size = diff_words->minus.text.size;
451 minus.ptr = xmalloc(minus.size);
452 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
453 for (i = 0; i < minus.size; i++)
454 if (isspace(minus.ptr[i]))
455 minus.ptr[i] = '\n';
456 diff_words->minus.current = 0;
457
458 plus.size = diff_words->plus.text.size;
459 plus.ptr = xmalloc(plus.size);
460 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
461 for (i = 0; i < plus.size; i++)
462 if (isspace(plus.ptr[i]))
463 plus.ptr[i] = '\n';
464 diff_words->plus.current = 0;
465
466 xpp.flags = XDF_NEED_MINIMAL;
467 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
f59a59e2
JS
468 ecb.outf = xdiff_outf;
469 ecb.priv = diff_words;
470 diff_words->xm.consume = fn_out_diff_words_aux;
c279d7e9 471 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
f59a59e2
JS
472
473 free(minus.ptr);
474 free(plus.ptr);
475 diff_words->minus.text.size = diff_words->plus.text.size = 0;
476
477 if (diff_words->minus.suppressed_newline) {
478 putchar('\n');
479 diff_words->minus.suppressed_newline = 0;
480 }
481}
482
23707811
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483typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
484
6973dcae 485struct emit_callback {
cd112cef
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486 struct xdiff_emit_state xm;
487 int nparents, color_diff;
cf1b7869 488 unsigned ws_rule;
23707811 489 sane_truncate_fn truncate;
6973dcae 490 const char **label_path;
f59a59e2 491 struct diff_words_data *diff_words;
34a5e1a2 492 int *found_changesp;
6973dcae
JH
493};
494
f59a59e2
JS
495static void free_diff_words_data(struct emit_callback *ecbdata)
496{
497 if (ecbdata->diff_words) {
498 /* flush buffers */
499 if (ecbdata->diff_words->minus.text.size ||
500 ecbdata->diff_words->plus.text.size)
501 diff_words_show(ecbdata->diff_words);
502
503 if (ecbdata->diff_words->minus.text.ptr)
504 free (ecbdata->diff_words->minus.text.ptr);
505 if (ecbdata->diff_words->plus.text.ptr)
506 free (ecbdata->diff_words->plus.text.ptr);
507 free(ecbdata->diff_words);
508 ecbdata->diff_words = NULL;
509 }
510}
511
ce436973 512const char *diff_get_color(int diff_use_color, enum color_diff ix)
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513{
514 if (diff_use_color)
50f575fc
LT
515 return diff_colors[ix];
516 return "";
cd112cef
JS
517}
518
448c3ef1
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519static void emit_line(const char *set, const char *reset, const char *line, int len)
520{
448c3ef1
JH
521 fputs(set, stdout);
522 fwrite(line, len, 1, stdout);
448c3ef1 523 fputs(reset, stdout);
448c3ef1
JH
524}
525
c5a8c3ec
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526static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
527{
528 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
529 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
530
531 if (!*ws)
532 emit_line(set, reset, line, len);
c1795bb0
WC
533 else {
534 /* Emit just the prefix, then the rest. */
535 emit_line(set, reset, line, ecbdata->nparents);
536 (void)check_and_emit_line(line + ecbdata->nparents,
537 len - ecbdata->nparents, ecbdata->ws_rule,
538 stdout, set, reset, ws);
539 }
c5a8c3ec
JS
540}
541
23707811
JH
542static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
543{
544 const char *cp;
545 unsigned long allot;
546 size_t l = len;
547
548 if (ecb->truncate)
549 return ecb->truncate(line, len);
550 cp = line;
551 allot = l;
552 while (0 < l) {
553 (void) utf8_width(&cp, &l);
554 if (!cp)
555 break; /* truncated in the middle? */
556 }
557 return allot - l;
558}
559
cd112cef 560static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
561{
562 int i;
448c3ef1 563 int color;
6973dcae 564 struct emit_callback *ecbdata = priv;
472ca780
JK
565 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
566 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 567 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 568
34a5e1a2
JS
569 *(ecbdata->found_changesp) = 1;
570
6973dcae 571 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
572 const char *name_a_tab, *name_b_tab;
573
574 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
575 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
576
577 printf("%s--- %s%s%s\n",
472ca780 578 meta, ecbdata->label_path[0], reset, name_a_tab);
1a9eb3b9 579 printf("%s+++ %s%s%s\n",
472ca780 580 meta, ecbdata->label_path[1], reset, name_b_tab);
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JH
581 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
582 }
cd112cef
JS
583
584 /* This is not really necessary for now because
585 * this codepath only deals with two-way diffs.
586 */
587 for (i = 0; i < len && line[i] == '@'; i++)
588 ;
589 if (2 <= i && i < len && line[i] == ' ') {
590 ecbdata->nparents = i - 1;
23707811 591 len = sane_truncate_line(ecbdata, line, len);
448c3ef1
JH
592 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
593 reset, line, len);
23707811
JH
594 if (line[len-1] != '\n')
595 putchar('\n');
448c3ef1 596 return;
cd112cef 597 }
448c3ef1
JH
598
599 if (len < ecbdata->nparents) {
448c3ef1
JH
600 emit_line(reset, reset, line, len);
601 return;
cd112cef 602 }
448c3ef1
JH
603
604 color = DIFF_PLAIN;
605 if (ecbdata->diff_words && ecbdata->nparents != 1)
606 /* fall back to normal diff */
607 free_diff_words_data(ecbdata);
608 if (ecbdata->diff_words) {
609 if (line[0] == '-') {
610 diff_words_append(line, len,
611 &ecbdata->diff_words->minus);
612 return;
613 } else if (line[0] == '+') {
614 diff_words_append(line, len,
615 &ecbdata->diff_words->plus);
616 return;
617 }
618 if (ecbdata->diff_words->minus.text.size ||
619 ecbdata->diff_words->plus.text.size)
620 diff_words_show(ecbdata->diff_words);
621 line++;
50f575fc 622 len--;
472ca780 623 emit_line(plain, reset, line, len);
448c3ef1
JH
624 return;
625 }
626 for (i = 0; i < ecbdata->nparents && len; i++) {
627 if (line[i] == '-')
628 color = DIFF_FILE_OLD;
629 else if (line[i] == '+')
630 color = DIFF_FILE_NEW;
631 }
632
633 if (color != DIFF_FILE_NEW) {
634 emit_line(diff_get_color(ecbdata->color_diff, color),
635 reset, line, len);
636 return;
637 }
638 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
639}
640
641static char *pprint_rename(const char *a, const char *b)
642{
643 const char *old = a;
644 const char *new = b;
663af342 645 struct strbuf name;
6973dcae
JH
646 int pfx_length, sfx_length;
647 int len_a = strlen(a);
648 int len_b = strlen(b);
663af342 649 int a_midlen, b_midlen;
e5bfbf9b
AJ
650 int qlen_a = quote_c_style(a, NULL, NULL, 0);
651 int qlen_b = quote_c_style(b, NULL, NULL, 0);
652
663af342 653 strbuf_init(&name, 0);
e5bfbf9b 654 if (qlen_a || qlen_b) {
663af342
PH
655 quote_c_style(a, &name, NULL, 0);
656 strbuf_addstr(&name, " => ");
657 quote_c_style(b, &name, NULL, 0);
b315c5c0 658 return strbuf_detach(&name, NULL);
e5bfbf9b 659 }
6973dcae
JH
660
661 /* Find common prefix */
662 pfx_length = 0;
663 while (*old && *new && *old == *new) {
664 if (*old == '/')
665 pfx_length = old - a + 1;
666 old++;
667 new++;
668 }
669
670 /* Find common suffix */
671 old = a + len_a;
672 new = b + len_b;
673 sfx_length = 0;
674 while (a <= old && b <= new && *old == *new) {
675 if (*old == '/')
676 sfx_length = len_a - (old - a);
677 old--;
678 new--;
679 }
680
681 /*
682 * pfx{mid-a => mid-b}sfx
683 * {pfx-a => pfx-b}sfx
684 * pfx{sfx-a => sfx-b}
685 * name-a => name-b
686 */
663af342
PH
687 a_midlen = len_a - pfx_length - sfx_length;
688 b_midlen = len_b - pfx_length - sfx_length;
689 if (a_midlen < 0)
690 a_midlen = 0;
691 if (b_midlen < 0)
692 b_midlen = 0;
693
694 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 695 if (pfx_length + sfx_length) {
663af342
PH
696 strbuf_add(&name, a, pfx_length);
697 strbuf_addch(&name, '{');
6973dcae 698 }
663af342
PH
699 strbuf_add(&name, a + pfx_length, a_midlen);
700 strbuf_addstr(&name, " => ");
701 strbuf_add(&name, b + pfx_length, b_midlen);
702 if (pfx_length + sfx_length) {
703 strbuf_addch(&name, '}');
704 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 705 }
b315c5c0 706 return strbuf_detach(&name, NULL);
6973dcae
JH
707}
708
709struct diffstat_t {
710 struct xdiff_emit_state xm;
711
712 int nr;
713 int alloc;
714 struct diffstat_file {
f604652e 715 char *from_name;
6973dcae 716 char *name;
f604652e 717 char *print_name;
6973dcae
JH
718 unsigned is_unmerged:1;
719 unsigned is_binary:1;
720 unsigned is_renamed:1;
721 unsigned int added, deleted;
722 } **files;
723};
724
725static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
726 const char *name_a,
727 const char *name_b)
728{
729 struct diffstat_file *x;
730 x = xcalloc(sizeof (*x), 1);
731 if (diffstat->nr == diffstat->alloc) {
732 diffstat->alloc = alloc_nr(diffstat->alloc);
733 diffstat->files = xrealloc(diffstat->files,
734 diffstat->alloc * sizeof(x));
735 }
736 diffstat->files[diffstat->nr++] = x;
737 if (name_b) {
f604652e
JH
738 x->from_name = xstrdup(name_a);
739 x->name = xstrdup(name_b);
6973dcae
JH
740 x->is_renamed = 1;
741 }
f604652e
JH
742 else {
743 x->from_name = NULL;
9befac47 744 x->name = xstrdup(name_a);
f604652e 745 }
6973dcae
JH
746 return x;
747}
748
749static void diffstat_consume(void *priv, char *line, unsigned long len)
750{
751 struct diffstat_t *diffstat = priv;
752 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
753
754 if (line[0] == '+')
755 x->added++;
756 else if (line[0] == '-')
757 x->deleted++;
758}
759
698ce6f8 760const char mime_boundary_leader[] = "------------";
6973dcae 761
a2540023
JH
762static int scale_linear(int it, int width, int max_change)
763{
764 /*
3ed74e60
JS
765 * make sure that at least one '-' is printed if there were deletions,
766 * and likewise for '+'.
a2540023 767 */
3ed74e60
JS
768 if (max_change < 2)
769 return it;
770 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
771}
772
785f7432
JH
773static void show_name(const char *prefix, const char *name, int len,
774 const char *reset, const char *set)
a2540023 775{
785f7432 776 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
777}
778
785f7432 779static void show_graph(char ch, int cnt, const char *set, const char *reset)
a2540023
JH
780{
781 if (cnt <= 0)
782 return;
785f7432 783 printf("%s", set);
a2540023
JH
784 while (cnt--)
785 putchar(ch);
785f7432 786 printf("%s", reset);
a2540023
JH
787}
788
f604652e
JH
789static void fill_print_name(struct diffstat_file *file)
790{
791 char *pname;
792
793 if (file->print_name)
794 return;
795
796 if (!file->is_renamed) {
797 struct strbuf buf;
798 strbuf_init(&buf, 0);
799 if (quote_c_style(file->name, &buf, NULL, 0)) {
800 pname = strbuf_detach(&buf, NULL);
801 } else {
802 pname = file->name;
803 strbuf_release(&buf);
804 }
805 } else {
806 pname = pprint_rename(file->from_name, file->name);
807 }
808 file->print_name = pname;
809}
810
a2540023 811static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 812{
6973dcae 813 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 814 int max_change = 0, max_len = 0;
6973dcae 815 int total_files = data->nr;
a2540023 816 int width, name_width;
785f7432 817 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
818
819 if (data->nr == 0)
820 return;
821
a2540023
JH
822 width = options->stat_width ? options->stat_width : 80;
823 name_width = options->stat_name_width ? options->stat_name_width : 50;
824
825 /* Sanity: give at least 5 columns to the graph,
826 * but leave at least 10 columns for the name.
827 */
828 if (width < name_width + 15) {
829 if (name_width <= 25)
830 width = name_width + 15;
831 else
832 name_width = width - 15;
833 }
834
835 /* Find the longest filename and max number of changes */
8f67f8ae
PH
836 reset = diff_get_color_opt(options, DIFF_RESET);
837 set = diff_get_color_opt(options, DIFF_PLAIN);
838 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
839 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 840
6973dcae
JH
841 for (i = 0; i < data->nr; i++) {
842 struct diffstat_file *file = data->files[i];
a2540023 843 int change = file->added + file->deleted;
f604652e
JH
844 fill_print_name(file);
845 len = strlen(file->print_name);
6973dcae
JH
846 if (max_len < len)
847 max_len = len;
848
849 if (file->is_binary || file->is_unmerged)
850 continue;
a2540023
JH
851 if (max_change < change)
852 max_change = change;
6973dcae
JH
853 }
854
a2540023
JH
855 /* Compute the width of the graph part;
856 * 10 is for one blank at the beginning of the line plus
857 * " | count " between the name and the graph.
858 *
859 * From here on, name_width is the width of the name area,
860 * and width is the width of the graph area.
861 */
862 name_width = (name_width < max_len) ? name_width : max_len;
863 if (width < (name_width + 10) + max_change)
864 width = width - (name_width + 10);
865 else
866 width = max_change;
867
6973dcae 868 for (i = 0; i < data->nr; i++) {
d2543b8e 869 const char *prefix = "";
f604652e 870 char *name = data->files[i]->print_name;
6973dcae
JH
871 int added = data->files[i]->added;
872 int deleted = data->files[i]->deleted;
a2540023 873 int name_len;
6973dcae
JH
874
875 /*
876 * "scale" the filename
877 */
a2540023
JH
878 len = name_width;
879 name_len = strlen(name);
880 if (name_width < name_len) {
6973dcae
JH
881 char *slash;
882 prefix = "...";
a2540023
JH
883 len -= 3;
884 name += name_len - len;
6973dcae
JH
885 slash = strchr(name, '/');
886 if (slash)
887 name = slash;
888 }
6973dcae
JH
889
890 if (data->files[i]->is_binary) {
785f7432 891 show_name(prefix, name, len, reset, set);
b1882587
AP
892 printf(" Bin ");
893 printf("%s%d%s", del_c, deleted, reset);
894 printf(" -> ");
895 printf("%s%d%s", add_c, added, reset);
896 printf(" bytes");
897 printf("\n");
f604652e 898 continue;
6973dcae
JH
899 }
900 else if (data->files[i]->is_unmerged) {
785f7432 901 show_name(prefix, name, len, reset, set);
a2540023 902 printf(" Unmerged\n");
f604652e 903 continue;
6973dcae
JH
904 }
905 else if (!data->files[i]->is_renamed &&
906 (added + deleted == 0)) {
907 total_files--;
f604652e 908 continue;
6973dcae
JH
909 }
910
a2540023
JH
911 /*
912 * scale the add/delete
913 */
6973dcae
JH
914 add = added;
915 del = deleted;
916 total = add + del;
917 adds += add;
918 dels += del;
919
a2540023 920 if (width <= max_change) {
a2540023 921 add = scale_linear(add, width, max_change);
3ed74e60
JS
922 del = scale_linear(del, width, max_change);
923 total = add + del;
6973dcae 924 }
785f7432 925 show_name(prefix, name, len, reset, set);
a2540023 926 printf("%5d ", added + deleted);
785f7432
JH
927 show_graph('+', add, add_c, reset);
928 show_graph('-', del, del_c, reset);
a2540023 929 putchar('\n');
6973dcae 930 }
785f7432
JH
931 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
932 set, total_files, adds, dels, reset);
6973dcae
JH
933}
934
ebd124c6
NP
935static void show_shortstats(struct diffstat_t* data)
936{
937 int i, adds = 0, dels = 0, total_files = data->nr;
938
939 if (data->nr == 0)
940 return;
941
942 for (i = 0; i < data->nr; i++) {
943 if (!data->files[i]->is_binary &&
944 !data->files[i]->is_unmerged) {
945 int added = data->files[i]->added;
946 int deleted= data->files[i]->deleted;
947 if (!data->files[i]->is_renamed &&
948 (added + deleted == 0)) {
949 total_files--;
950 } else {
951 adds += added;
952 dels += deleted;
953 }
954 }
ebd124c6 955 }
ebd124c6
NP
956 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
957 total_files, adds, dels);
958}
959
74e2abe5
JH
960static void show_numstat(struct diffstat_t* data, struct diff_options *options)
961{
962 int i;
963
f604652e
JH
964 if (data->nr == 0)
965 return;
966
74e2abe5
JH
967 for (i = 0; i < data->nr; i++) {
968 struct diffstat_file *file = data->files[i];
969
bfddbc5e
JH
970 if (file->is_binary)
971 printf("-\t-\t");
972 else
973 printf("%d\t%d\t", file->added, file->deleted);
f604652e
JH
974 if (options->line_termination) {
975 fill_print_name(file);
976 if (!file->is_renamed)
977 write_name_quoted(file->name, stdout,
978 options->line_termination);
979 else {
980 fputs(file->print_name, stdout);
981 putchar(options->line_termination);
982 }
663af342 983 } else {
f604652e
JH
984 if (file->is_renamed) {
985 putchar('\0');
986 write_name_quoted(file->from_name, stdout, '\0');
987 }
988 write_name_quoted(file->name, stdout, '\0');
663af342 989 }
74e2abe5
JH
990 }
991}
992
7df7c019
LT
993struct diffstat_dir {
994 struct diffstat_file **files;
995 int nr, percent, cumulative;
996};
997
998static long gather_dirstat(struct diffstat_dir *dir, unsigned long changed, const char *base, int baselen)
999{
1000 unsigned long this_dir = 0;
1001 unsigned int sources = 0;
1002
1003 while (dir->nr) {
1004 struct diffstat_file *f = *dir->files;
1005 int namelen = strlen(f->name);
1006 unsigned long this;
1007 char *slash;
1008
1009 if (namelen < baselen)
1010 break;
1011 if (memcmp(f->name, base, baselen))
1012 break;
1013 slash = strchr(f->name + baselen, '/');
1014 if (slash) {
1015 int newbaselen = slash + 1 - f->name;
1016 this = gather_dirstat(dir, changed, f->name, newbaselen);
1017 sources++;
1018 } else {
1019 this = f->added + f->deleted;
1020 dir->files++;
1021 dir->nr--;
1022 sources += 2;
1023 }
1024 this_dir += this;
1025 }
1026
1027 /*
1028 * We don't report dirstat's for
1029 * - the top level
1030 * - or cases where everything came from a single directory
1031 * under this directory (sources == 1).
1032 */
1033 if (baselen && sources != 1) {
1034 int permille = this_dir * 1000 / changed;
1035 if (permille) {
1036 int percent = permille / 10;
1037 if (percent >= dir->percent) {
1038 printf("%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
1039 if (!dir->cumulative)
1040 return 0;
1041 }
1042 }
1043 }
1044 return this_dir;
1045}
1046
1047static void show_dirstat(struct diffstat_t *data, struct diff_options *options)
1048{
1049 int i;
1050 unsigned long changed;
1051 struct diffstat_dir dir;
1052
1053 /* Calculate total changes */
1054 changed = 0;
1055 for (i = 0; i < data->nr; i++) {
1056 changed += data->files[i]->added;
1057 changed += data->files[i]->deleted;
1058 }
1059
1060 /* This can happen even with many files, if everything was renames */
1061 if (!changed)
1062 return;
1063
1064 /* Show all directories with more than x% of the changes */
1065 dir.files = data->files;
1066 dir.nr = data->nr;
1067 dir.percent = options->dirstat_percent;
1068 dir.cumulative = options->output_format & DIFF_FORMAT_CUMULATIVE;
1069 gather_dirstat(&dir, changed, "", 0);
1070}
1071
f604652e
JH
1072static void free_diffstat_info(struct diffstat_t *diffstat)
1073{
1074 int i;
1075 for (i = 0; i < diffstat->nr; i++) {
1076 struct diffstat_file *f = diffstat->files[i];
1077 if (f->name != f->print_name)
1078 free(f->print_name);
1079 free(f->name);
1080 free(f->from_name);
1081 free(f);
1082 }
1083 free(diffstat->files);
1084}
1085
88246898
JS
1086struct checkdiff_t {
1087 struct xdiff_emit_state xm;
1088 const char *filename;
c5a8c3ec 1089 int lineno, color_diff;
cf1b7869 1090 unsigned ws_rule;
62c64895 1091 unsigned status;
88246898
JS
1092};
1093
1094static void checkdiff_consume(void *priv, char *line, unsigned long len)
1095{
1096 struct checkdiff_t *data = priv;
c5a8c3ec
JS
1097 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
1098 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
1099 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
c1795bb0 1100 char *err;
88246898
JS
1101
1102 if (line[0] == '+') {
c1795bb0
WC
1103 data->status = check_and_emit_line(line + 1, len - 1,
1104 data->ws_rule, NULL, NULL, NULL, NULL);
1105 if (!data->status)
1106 return;
1107 err = whitespace_error_string(data->status);
45e2a4b2 1108 printf("%s:%d: %s.\n", data->filename, data->lineno, err);
c1795bb0
WC
1109 free(err);
1110 emit_line(set, reset, line, 1);
1111 (void)check_and_emit_line(line + 1, len - 1, data->ws_rule,
1112 stdout, set, reset, ws);
e6d40d65 1113 data->lineno++;
88246898
JS
1114 } else if (line[0] == ' ')
1115 data->lineno++;
1116 else if (line[0] == '@') {
1117 char *plus = strchr(line, '+');
1118 if (plus)
9e848163 1119 data->lineno = strtol(plus, NULL, 10);
88246898
JS
1120 else
1121 die("invalid diff");
1122 }
1123}
1124
0660626c
JH
1125static unsigned char *deflate_it(char *data,
1126 unsigned long size,
1127 unsigned long *result_size)
051308f6 1128{
0660626c
JH
1129 int bound;
1130 unsigned char *deflated;
1131 z_stream stream;
1132
1133 memset(&stream, 0, sizeof(stream));
12f6c308 1134 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1135 bound = deflateBound(&stream, size);
1136 deflated = xmalloc(bound);
1137 stream.next_out = deflated;
1138 stream.avail_out = bound;
1139
1140 stream.next_in = (unsigned char *)data;
1141 stream.avail_in = size;
1142 while (deflate(&stream, Z_FINISH) == Z_OK)
1143 ; /* nothing */
1144 deflateEnd(&stream);
1145 *result_size = stream.total_out;
1146 return deflated;
051308f6
JH
1147}
1148
d4c452f0 1149static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
051308f6 1150{
0660626c
JH
1151 void *cp;
1152 void *delta;
1153 void *deflated;
1154 void *data;
1155 unsigned long orig_size;
1156 unsigned long delta_size;
1157 unsigned long deflate_size;
1158 unsigned long data_size;
051308f6 1159
0660626c
JH
1160 /* We could do deflated delta, or we could do just deflated two,
1161 * whichever is smaller.
051308f6 1162 */
0660626c
JH
1163 delta = NULL;
1164 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1165 if (one->size && two->size) {
1166 delta = diff_delta(one->ptr, one->size,
1167 two->ptr, two->size,
1168 &delta_size, deflate_size);
1169 if (delta) {
1170 void *to_free = delta;
1171 orig_size = delta_size;
1172 delta = deflate_it(delta, delta_size, &delta_size);
1173 free(to_free);
051308f6
JH
1174 }
1175 }
051308f6 1176
0660626c
JH
1177 if (delta && delta_size < deflate_size) {
1178 printf("delta %lu\n", orig_size);
1179 free(deflated);
1180 data = delta;
1181 data_size = delta_size;
1182 }
1183 else {
1184 printf("literal %lu\n", two->size);
1185 free(delta);
1186 data = deflated;
1187 data_size = deflate_size;
1188 }
051308f6 1189
0660626c
JH
1190 /* emit data encoded in base85 */
1191 cp = data;
1192 while (data_size) {
1193 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1194 char line[70];
0660626c 1195 data_size -= bytes;
051308f6
JH
1196 if (bytes <= 26)
1197 line[0] = bytes + 'A' - 1;
1198 else
1199 line[0] = bytes - 26 + 'a' - 1;
1200 encode_85(line + 1, cp, bytes);
1d7f171c 1201 cp = (char *) cp + bytes;
051308f6
JH
1202 puts(line);
1203 }
1204 printf("\n");
0660626c 1205 free(data);
051308f6
JH
1206}
1207
d4c452f0
JH
1208static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1209{
1210 printf("GIT binary patch\n");
1211 emit_binary_diff_body(one, two);
1212 emit_binary_diff_body(two, one);
1213}
1214
8c701249
JH
1215static void setup_diff_attr_check(struct git_attr_check *check)
1216{
1217 static struct git_attr *attr_diff;
1218
29a3eefd 1219 if (!attr_diff) {
8c701249 1220 attr_diff = git_attr("diff", 4);
29a3eefd
JH
1221 }
1222 check[0].attr = attr_diff;
8c701249
JH
1223}
1224
29a3eefd 1225static void diff_filespec_check_attr(struct diff_filespec *one)
6973dcae 1226{
e0e324a4 1227 struct git_attr_check attr_diff_check;
2c3fa66f 1228 int check_from_data = 0;
8c701249 1229
29a3eefd
JH
1230 if (one->checked_attr)
1231 return;
1232
e0e324a4 1233 setup_diff_attr_check(&attr_diff_check);
29a3eefd 1234 one->is_binary = 0;
e0e324a4 1235 one->funcname_pattern_ident = NULL;
29a3eefd 1236
e0e324a4 1237 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
29a3eefd
JH
1238 const char *value;
1239
1240 /* binaryness */
e0e324a4 1241 value = attr_diff_check.value;
515106fa 1242 if (ATTR_TRUE(value))
29a3eefd 1243 ;
515106fa 1244 else if (ATTR_FALSE(value))
29a3eefd 1245 one->is_binary = 1;
2c3fa66f
JH
1246 else
1247 check_from_data = 1;
f258475a 1248
e0e324a4 1249 /* funcname pattern ident */
f258475a
JH
1250 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1251 ;
1252 else
e0e324a4 1253 one->funcname_pattern_ident = value;
515106fa 1254 }
40250af4 1255
2c3fa66f
JH
1256 if (check_from_data) {
1257 if (!one->data && DIFF_FILE_VALID(one))
1258 diff_populate_filespec(one, 0);
29a3eefd 1259
2c3fa66f
JH
1260 if (one->data)
1261 one->is_binary = buffer_is_binary(one->data, one->size);
1262 }
29a3eefd
JH
1263}
1264
1265int diff_filespec_is_binary(struct diff_filespec *one)
1266{
1267 diff_filespec_check_attr(one);
1268 return one->is_binary;
6973dcae
JH
1269}
1270
e0e324a4 1271static const char *funcname_pattern(const char *ident)
f258475a 1272{
e0e324a4 1273 struct funcname_pattern *pp;
f258475a 1274
e0e324a4
JH
1275 for (pp = funcname_pattern_list; pp; pp = pp->next)
1276 if (!strcmp(ident, pp->name))
1277 return pp->pattern;
f258475a
JH
1278 return NULL;
1279}
1280
d3a93dc9
JH
1281static struct builtin_funcname_pattern {
1282 const char *name;
1283 const char *pattern;
1284} builtin_funcname_pattern[] = {
1285 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1286 "new\\|return\\|switch\\|throw\\|while\\)\n"
1287 "^[ ]*\\(\\([ ]*"
1288 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
1289 "[ ]*([^;]*$\\)" },
1290 { "tex", "^\\(\\\\\\(sub\\)*section{.*\\)$" },
1291};
1292
e0e324a4 1293static const char *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1294{
e0e324a4 1295 const char *ident, *pattern;
d3a93dc9 1296 int i;
f258475a
JH
1297
1298 diff_filespec_check_attr(one);
e0e324a4 1299 ident = one->funcname_pattern_ident;
f258475a
JH
1300
1301 if (!ident)
1302 /*
1303 * If the config file has "funcname.default" defined, that
1304 * regexp is used; otherwise NULL is returned and xemit uses
1305 * the built-in default.
1306 */
e0e324a4 1307 return funcname_pattern("default");
f258475a
JH
1308
1309 /* Look up custom "funcname.$ident" regexp from config. */
e0e324a4
JH
1310 pattern = funcname_pattern(ident);
1311 if (pattern)
1312 return pattern;
f258475a
JH
1313
1314 /*
1315 * And define built-in fallback patterns here. Note that
9f6fe822 1316 * these can be overridden by the user's config settings.
f258475a 1317 */
d3a93dc9
JH
1318 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1319 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1320 return builtin_funcname_pattern[i].pattern;
f258475a
JH
1321
1322 return NULL;
1323}
1324
6973dcae
JH
1325static void builtin_diff(const char *name_a,
1326 const char *name_b,
1327 struct diff_filespec *one,
1328 struct diff_filespec *two,
1329 const char *xfrm_msg,
051308f6 1330 struct diff_options *o,
6973dcae
JH
1331 int complete_rewrite)
1332{
1333 mmfile_t mf1, mf2;
1334 const char *lbl[2];
1335 char *a_one, *b_two;
8f67f8ae
PH
1336 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1337 const char *reset = diff_get_color_opt(o, DIFF_RESET);
6973dcae 1338
eab9a40b
JS
1339 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1340 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
1341 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1342 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
50f575fc 1343 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1344 if (lbl[0][0] == '/') {
1345 /* /dev/null */
50f575fc
LT
1346 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1347 if (xfrm_msg && xfrm_msg[0])
1348 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1349 }
1350 else if (lbl[1][0] == '/') {
50f575fc
LT
1351 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1352 if (xfrm_msg && xfrm_msg[0])
1353 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1354 }
1355 else {
1356 if (one->mode != two->mode) {
50f575fc
LT
1357 printf("%sold mode %06o%s\n", set, one->mode, reset);
1358 printf("%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1359 }
50f575fc
LT
1360 if (xfrm_msg && xfrm_msg[0])
1361 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1362 /*
1363 * we do not run diff between different kind
1364 * of objects.
1365 */
1366 if ((one->mode ^ two->mode) & S_IFMT)
1367 goto free_ab_and_return;
1368 if (complete_rewrite) {
eab9a40b 1369 emit_rewrite_diff(name_a, name_b, one, two, o);
34a5e1a2 1370 o->found_changes = 1;
6973dcae
JH
1371 goto free_ab_and_return;
1372 }
1373 }
1374
1375 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1376 die("unable to read files to diff");
1377
8f67f8ae 1378 if (!DIFF_OPT_TST(o, TEXT) &&
29a3eefd 1379 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
0660626c
JH
1380 /* Quite common confusing case */
1381 if (mf1.size == mf2.size &&
1382 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1383 goto free_ab_and_return;
8f67f8ae 1384 if (DIFF_OPT_TST(o, BINARY))
051308f6
JH
1385 emit_binary_diff(&mf1, &mf2);
1386 else
1387 printf("Binary files %s and %s differ\n",
1388 lbl[0], lbl[1]);
34a5e1a2 1389 o->found_changes = 1;
051308f6 1390 }
6973dcae
JH
1391 else {
1392 /* Crazy xdl interfaces.. */
1393 const char *diffopts = getenv("GIT_DIFF_OPTS");
1394 xpparam_t xpp;
1395 xdemitconf_t xecfg;
1396 xdemitcb_t ecb;
1397 struct emit_callback ecbdata;
e0e324a4 1398 const char *funcname_pattern;
f258475a 1399
e0e324a4
JH
1400 funcname_pattern = diff_funcname_pattern(one);
1401 if (!funcname_pattern)
1402 funcname_pattern = diff_funcname_pattern(two);
6973dcae 1403
30b25010 1404 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1405 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1406 ecbdata.label_path = lbl;
8f67f8ae 1407 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
34a5e1a2 1408 ecbdata.found_changesp = &o->found_changes;
cf1b7869 1409 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
0d21efa5 1410 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1411 xecfg.ctxlen = o->context;
6973dcae 1412 xecfg.flags = XDL_EMIT_FUNCNAMES;
e0e324a4
JH
1413 if (funcname_pattern)
1414 xdiff_set_find_func(&xecfg, funcname_pattern);
6973dcae
JH
1415 if (!diffopts)
1416 ;
cc44c765 1417 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1418 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1419 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1420 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1421 ecb.outf = xdiff_outf;
6973dcae 1422 ecb.priv = &ecbdata;
cd112cef 1423 ecbdata.xm.consume = fn_out_consume;
8f67f8ae 1424 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
f59a59e2
JS
1425 ecbdata.diff_words =
1426 xcalloc(1, sizeof(struct diff_words_data));
c279d7e9 1427 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
8f67f8ae 1428 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
f59a59e2 1429 free_diff_words_data(&ecbdata);
6973dcae
JH
1430 }
1431
1432 free_ab_and_return:
fc3abdf5
JH
1433 diff_free_filespec_data(one);
1434 diff_free_filespec_data(two);
6973dcae
JH
1435 free(a_one);
1436 free(b_two);
1437 return;
1438}
1439
1440static void builtin_diffstat(const char *name_a, const char *name_b,
1441 struct diff_filespec *one,
1442 struct diff_filespec *two,
710158e3 1443 struct diffstat_t *diffstat,
0d21efa5 1444 struct diff_options *o,
710158e3 1445 int complete_rewrite)
6973dcae
JH
1446{
1447 mmfile_t mf1, mf2;
1448 struct diffstat_file *data;
1449
1450 data = diffstat_add(diffstat, name_a, name_b);
1451
1452 if (!one || !two) {
1453 data->is_unmerged = 1;
1454 return;
1455 }
710158e3
JH
1456 if (complete_rewrite) {
1457 diff_populate_filespec(one, 0);
1458 diff_populate_filespec(two, 0);
1459 data->deleted = count_lines(one->data, one->size);
1460 data->added = count_lines(two->data, two->size);
fc3abdf5 1461 goto free_and_return;
710158e3 1462 }
6973dcae
JH
1463 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1464 die("unable to read files to diff");
1465
29a3eefd 1466 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
6973dcae 1467 data->is_binary = 1;
b1882587
AP
1468 data->added = mf2.size;
1469 data->deleted = mf1.size;
1470 } else {
6973dcae
JH
1471 /* Crazy xdl interfaces.. */
1472 xpparam_t xpp;
1473 xdemitconf_t xecfg;
1474 xdemitcb_t ecb;
1475
30b25010 1476 memset(&xecfg, 0, sizeof(xecfg));
0d21efa5 1477 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1478 ecb.outf = xdiff_outf;
1479 ecb.priv = diffstat;
c279d7e9 1480 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
6973dcae 1481 }
fc3abdf5
JH
1482
1483 free_and_return:
1484 diff_free_filespec_data(one);
1485 diff_free_filespec_data(two);
6973dcae
JH
1486}
1487
88246898
JS
1488static void builtin_checkdiff(const char *name_a, const char *name_b,
1489 struct diff_filespec *one,
c5a8c3ec 1490 struct diff_filespec *two, struct diff_options *o)
88246898
JS
1491{
1492 mmfile_t mf1, mf2;
1493 struct checkdiff_t data;
1494
1495 if (!two)
1496 return;
1497
1498 memset(&data, 0, sizeof(data));
1499 data.xm.consume = checkdiff_consume;
1500 data.filename = name_b ? name_b : name_a;
1501 data.lineno = 0;
8f67f8ae 1502 data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
cf1b7869 1503 data.ws_rule = whitespace_rule(data.filename);
88246898
JS
1504
1505 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1506 die("unable to read files to diff");
1507
29a3eefd 1508 if (diff_filespec_is_binary(two))
fc3abdf5 1509 goto free_and_return;
88246898
JS
1510 else {
1511 /* Crazy xdl interfaces.. */
1512 xpparam_t xpp;
1513 xdemitconf_t xecfg;
1514 xdemitcb_t ecb;
1515
30b25010 1516 memset(&xecfg, 0, sizeof(xecfg));
88246898 1517 xpp.flags = XDF_NEED_MINIMAL;
88246898
JS
1518 ecb.outf = xdiff_outf;
1519 ecb.priv = &data;
c279d7e9 1520 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
88246898 1521 }
fc3abdf5
JH
1522 free_and_return:
1523 diff_free_filespec_data(one);
1524 diff_free_filespec_data(two);
62c64895
WC
1525 if (data.status)
1526 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
1527}
1528
6973dcae
JH
1529struct diff_filespec *alloc_filespec(const char *path)
1530{
1531 int namelen = strlen(path);
1532 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1533
1534 memset(spec, 0, sizeof(*spec));
1535 spec->path = (char *)(spec + 1);
1536 memcpy(spec->path, path, namelen+1);
9fb88419 1537 spec->count = 1;
6973dcae
JH
1538 return spec;
1539}
1540
9fb88419
LT
1541void free_filespec(struct diff_filespec *spec)
1542{
1543 if (!--spec->count) {
1544 diff_free_filespec_data(spec);
1545 free(spec);
1546 }
1547}
1548
6973dcae
JH
1549void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1550 unsigned short mode)
1551{
1552 if (mode) {
1553 spec->mode = canon_mode(mode);
e702496e 1554 hashcpy(spec->sha1, sha1);
0bef57ee 1555 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1556 }
1557}
1558
1559/*
5adf317b 1560 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
1561 * the work tree has that object contents, return true, so that
1562 * prepare_temp_file() does not have to inflate and extract.
1563 */
1510fea7 1564static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1565{
1566 struct cache_entry *ce;
1567 struct stat st;
1568 int pos, len;
1569
1570 /* We do not read the cache ourselves here, because the
1571 * benchmark with my previous version that always reads cache
1572 * shows that it makes things worse for diff-tree comparing
1573 * two linux-2.6 kernel trees in an already checked out work
1574 * tree. This is because most diff-tree comparisons deal with
1575 * only a small number of files, while reading the cache is
1576 * expensive for a large project, and its cost outweighs the
1577 * savings we get by not inflating the object to a temporary
1578 * file. Practically, this code only helps when we are used
1579 * by diff-cache --cached, which does read the cache before
1580 * calling us.
1581 */
1582 if (!active_cache)
1583 return 0;
1584
1510fea7
SP
1585 /* We want to avoid the working directory if our caller
1586 * doesn't need the data in a normal file, this system
1587 * is rather slow with its stat/open/mmap/close syscalls,
1588 * and the object is contained in a pack file. The pack
1589 * is probably already open and will be faster to obtain
1590 * the data through than the working directory. Loose
1591 * objects however would tend to be slower as they need
1592 * to be individually opened and inflated.
1593 */
5caf9232 1594 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1595 return 0;
1596
6973dcae
JH
1597 len = strlen(name);
1598 pos = cache_name_pos(name, len);
1599 if (pos < 0)
1600 return 0;
1601 ce = active_cache[pos];
eadb5831
JH
1602
1603 /*
1604 * This is not the sha1 we are looking for, or
1605 * unreusable because it is not a regular file.
1606 */
1607 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 1608 return 0;
eadb5831
JH
1609
1610 /*
1611 * If ce matches the file in the work tree, we can reuse it.
6973dcae 1612 */
eadb5831
JH
1613 if (ce_uptodate(ce) ||
1614 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1615 return 1;
1616
1617 return 0;
6973dcae
JH
1618}
1619
3afaa72d
JH
1620static int populate_from_stdin(struct diff_filespec *s)
1621{
af6eb822 1622 struct strbuf buf;
c32f749f 1623 size_t size = 0;
af6eb822 1624
f1696ee3
PH
1625 strbuf_init(&buf, 0);
1626 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 1627 return error("error while reading from stdin %s",
3afaa72d 1628 strerror(errno));
af6eb822 1629
3afaa72d 1630 s->should_munmap = 0;
c32f749f
RS
1631 s->data = strbuf_detach(&buf, &size);
1632 s->size = size;
3afaa72d
JH
1633 s->should_free = 1;
1634 return 0;
1635}
1636
04786756
LT
1637static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1638{
1639 int len;
1640 char *data = xmalloc(100);
1641 len = snprintf(data, 100,
1642 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1643 s->data = data;
1644 s->size = len;
1645 s->should_free = 1;
1646 if (size_only) {
1647 s->data = NULL;
1648 free(data);
1649 }
1650 return 0;
1651}
1652
6973dcae
JH
1653/*
1654 * While doing rename detection and pickaxe operation, we may need to
1655 * grab the data for the blob (or file) for our own in-core comparison.
1656 * diff_filespec has data and size fields for this purpose.
1657 */
1658int diff_populate_filespec(struct diff_filespec *s, int size_only)
1659{
1660 int err = 0;
1661 if (!DIFF_FILE_VALID(s))
1662 die("internal error: asking to populate invalid file.");
1663 if (S_ISDIR(s->mode))
1664 return -1;
1665
6973dcae 1666 if (s->data)
fc3abdf5 1667 return 0;
04786756 1668
6e0b8ed6
JH
1669 if (size_only && 0 < s->size)
1670 return 0;
1671
302b9282 1672 if (S_ISGITLINK(s->mode))
04786756
LT
1673 return diff_populate_gitlink(s, size_only);
1674
6973dcae 1675 if (!s->sha1_valid ||
1510fea7 1676 reuse_worktree_file(s->path, s->sha1, 0)) {
5ecd293d 1677 struct strbuf buf;
6973dcae
JH
1678 struct stat st;
1679 int fd;
6c510bee 1680
3afaa72d
JH
1681 if (!strcmp(s->path, "-"))
1682 return populate_from_stdin(s);
1683
6973dcae
JH
1684 if (lstat(s->path, &st) < 0) {
1685 if (errno == ENOENT) {
1686 err_empty:
1687 err = -1;
1688 empty:
d2543b8e 1689 s->data = (char *)"";
6973dcae
JH
1690 s->size = 0;
1691 return err;
1692 }
1693 }
dc49cd76 1694 s->size = xsize_t(st.st_size);
6973dcae
JH
1695 if (!s->size)
1696 goto empty;
1697 if (size_only)
1698 return 0;
1699 if (S_ISLNK(st.st_mode)) {
1700 int ret;
1701 s->data = xmalloc(s->size);
1702 s->should_free = 1;
1703 ret = readlink(s->path, s->data, s->size);
1704 if (ret < 0) {
1705 free(s->data);
1706 goto err_empty;
1707 }
1708 return 0;
1709 }
1710 fd = open(s->path, O_RDONLY);
1711 if (fd < 0)
1712 goto err_empty;
c4712e45 1713 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1714 close(fd);
6973dcae 1715 s->should_munmap = 1;
6c510bee
LT
1716
1717 /*
1718 * Convert from working tree format to canonical git format
1719 */
5ecd293d
PH
1720 strbuf_init(&buf, 0);
1721 if (convert_to_git(s->path, s->data, s->size, &buf)) {
c32f749f 1722 size_t size = 0;
6c510bee
LT
1723 munmap(s->data, s->size);
1724 s->should_munmap = 0;
c32f749f
RS
1725 s->data = strbuf_detach(&buf, &size);
1726 s->size = size;
6c510bee
LT
1727 s->should_free = 1;
1728 }
6973dcae
JH
1729 }
1730 else {
21666f1a 1731 enum object_type type;
6e0b8ed6 1732 if (size_only)
21666f1a 1733 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1734 else {
21666f1a 1735 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1736 s->should_free = 1;
1737 }
1738 }
1739 return 0;
1740}
1741
8ae92e63 1742void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
1743{
1744 if (s->should_free)
1745 free(s->data);
1746 else if (s->should_munmap)
1747 munmap(s->data, s->size);
fc3abdf5
JH
1748
1749 if (s->should_free || s->should_munmap) {
1750 s->should_free = s->should_munmap = 0;
1751 s->data = NULL;
1752 }
eede7b7d
JK
1753}
1754
1755void diff_free_filespec_data(struct diff_filespec *s)
1756{
8ae92e63 1757 diff_free_filespec_blob(s);
6973dcae
JH
1758 free(s->cnt_data);
1759 s->cnt_data = NULL;
1760}
1761
1762static void prep_temp_blob(struct diff_tempfile *temp,
1763 void *blob,
1764 unsigned long size,
1765 const unsigned char *sha1,
1766 int mode)
1767{
1768 int fd;
1769
1472966c 1770 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae 1771 if (fd < 0)
e7a7be88 1772 die("unable to create temp-file: %s", strerror(errno));
93822c22 1773 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1774 die("unable to write temp-file");
1775 close(fd);
1776 temp->name = temp->tmp_path;
1777 strcpy(temp->hex, sha1_to_hex(sha1));
1778 temp->hex[40] = 0;
1779 sprintf(temp->mode, "%06o", mode);
1780}
1781
1782static void prepare_temp_file(const char *name,
1783 struct diff_tempfile *temp,
1784 struct diff_filespec *one)
1785{
1786 if (!DIFF_FILE_VALID(one)) {
1787 not_a_valid_file:
1788 /* A '-' entry produces this for file-2, and
1789 * a '+' entry produces this for file-1.
1790 */
1791 temp->name = "/dev/null";
1792 strcpy(temp->hex, ".");
1793 strcpy(temp->mode, ".");
1794 return;
1795 }
1796
1797 if (!one->sha1_valid ||
1510fea7 1798 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1799 struct stat st;
1800 if (lstat(name, &st) < 0) {
1801 if (errno == ENOENT)
1802 goto not_a_valid_file;
1803 die("stat(%s): %s", name, strerror(errno));
1804 }
1805 if (S_ISLNK(st.st_mode)) {
1806 int ret;
1807 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1808 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1809 if (sizeof(buf) <= st.st_size)
1810 die("symlink too long: %s", name);
dc49cd76 1811 ret = readlink(name, buf, sz);
6973dcae
JH
1812 if (ret < 0)
1813 die("readlink(%s)", name);
dc49cd76 1814 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1815 (one->sha1_valid ?
1816 one->sha1 : null_sha1),
1817 (one->sha1_valid ?
1818 one->mode : S_IFLNK));
1819 }
1820 else {
1821 /* we can borrow from the file in the work tree */
1822 temp->name = name;
1823 if (!one->sha1_valid)
1824 strcpy(temp->hex, sha1_to_hex(null_sha1));
1825 else
1826 strcpy(temp->hex, sha1_to_hex(one->sha1));
1827 /* Even though we may sometimes borrow the
1828 * contents from the work tree, we always want
1829 * one->mode. mode is trustworthy even when
1830 * !(one->sha1_valid), as long as
1831 * DIFF_FILE_VALID(one).
1832 */
1833 sprintf(temp->mode, "%06o", one->mode);
1834 }
1835 return;
1836 }
1837 else {
1838 if (diff_populate_filespec(one, 0))
1839 die("cannot read data blob for %s", one->path);
1840 prep_temp_blob(temp, one->data, one->size,
1841 one->sha1, one->mode);
1842 }
1843}
1844
1845static void remove_tempfile(void)
1846{
1847 int i;
1848
1849 for (i = 0; i < 2; i++)
1850 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1851 unlink(diff_temp[i].name);
1852 diff_temp[i].name = NULL;
1853 }
1854}
1855
1856static void remove_tempfile_on_signal(int signo)
1857{
1858 remove_tempfile();
1859 signal(SIGINT, SIG_DFL);
1860 raise(signo);
1861}
1862
6973dcae
JH
1863/* An external diff command takes:
1864 *
1865 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1866 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1867 *
1868 */
1869static void run_external_diff(const char *pgm,
1870 const char *name,
1871 const char *other,
1872 struct diff_filespec *one,
1873 struct diff_filespec *two,
1874 const char *xfrm_msg,
1875 int complete_rewrite)
1876{
1877 const char *spawn_arg[10];
1878 struct diff_tempfile *temp = diff_temp;
1879 int retval;
1880 static int atexit_asked = 0;
1881 const char *othername;
1882 const char **arg = &spawn_arg[0];
1883
1884 othername = (other? other : name);
1885 if (one && two) {
1886 prepare_temp_file(name, &temp[0], one);
1887 prepare_temp_file(othername, &temp[1], two);
1888 if (! atexit_asked &&
1889 (temp[0].name == temp[0].tmp_path ||
1890 temp[1].name == temp[1].tmp_path)) {
1891 atexit_asked = 1;
1892 atexit(remove_tempfile);
1893 }
1894 signal(SIGINT, remove_tempfile_on_signal);
1895 }
1896
1897 if (one && two) {
1898 *arg++ = pgm;
1899 *arg++ = name;
1900 *arg++ = temp[0].name;
1901 *arg++ = temp[0].hex;
1902 *arg++ = temp[0].mode;
1903 *arg++ = temp[1].name;
1904 *arg++ = temp[1].hex;
1905 *arg++ = temp[1].mode;
1906 if (other) {
1907 *arg++ = other;
1908 *arg++ = xfrm_msg;
1909 }
1910 } else {
1911 *arg++ = pgm;
1912 *arg++ = name;
1913 }
1914 *arg = NULL;
d5535ec7
JS
1915 fflush(NULL);
1916 retval = run_command_v_opt(spawn_arg, 0);
6973dcae
JH
1917 remove_tempfile();
1918 if (retval) {
1919 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1920 exit(1);
1921 }
1922}
1923
f1af60bd
JH
1924static const char *external_diff_attr(const char *name)
1925{
1926 struct git_attr_check attr_diff_check;
1927
1928 setup_diff_attr_check(&attr_diff_check);
1929 if (!git_checkattr(name, 1, &attr_diff_check)) {
1930 const char *value = attr_diff_check.value;
1931 if (!ATTR_TRUE(value) &&
1932 !ATTR_FALSE(value) &&
1933 !ATTR_UNSET(value)) {
1934 struct ll_diff_driver *drv;
1935
f1af60bd
JH
1936 for (drv = user_diff; drv; drv = drv->next)
1937 if (!strcmp(drv->name, value))
1938 return drv->cmd;
1939 }
1940 }
1941 return NULL;
1942}
1943
6973dcae
JH
1944static void run_diff_cmd(const char *pgm,
1945 const char *name,
1946 const char *other,
1947 struct diff_filespec *one,
1948 struct diff_filespec *two,
1949 const char *xfrm_msg,
051308f6 1950 struct diff_options *o,
6973dcae
JH
1951 int complete_rewrite)
1952{
8f67f8ae 1953 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
1954 pgm = NULL;
1955 else {
1956 const char *cmd = external_diff_attr(name);
1957 if (cmd)
1958 pgm = cmd;
1959 }
1960
6973dcae
JH
1961 if (pgm) {
1962 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1963 complete_rewrite);
1964 return;
1965 }
1966 if (one && two)
1967 builtin_diff(name, other ? other : name,
051308f6 1968 one, two, xfrm_msg, o, complete_rewrite);
6973dcae
JH
1969 else
1970 printf("* Unmerged path %s\n", name);
1971}
1972
1973static void diff_fill_sha1_info(struct diff_filespec *one)
1974{
1975 if (DIFF_FILE_VALID(one)) {
1976 if (!one->sha1_valid) {
1977 struct stat st;
5332b2af
JS
1978 if (!strcmp(one->path, "-")) {
1979 hashcpy(one->sha1, null_sha1);
1980 return;
1981 }
6973dcae
JH
1982 if (lstat(one->path, &st) < 0)
1983 die("stat %s", one->path);
1984 if (index_path(one->sha1, one->path, &st, 0))
1985 die("cannot hash %s\n", one->path);
1986 }
1987 }
1988 else
e702496e 1989 hashclr(one->sha1);
6973dcae
JH
1990}
1991
125b7630
RS
1992static int similarity_index(struct diff_filepair *p)
1993{
1994 return p->score * 100 / MAX_SCORE;
1995}
1996
6973dcae
JH
1997static void run_diff(struct diff_filepair *p, struct diff_options *o)
1998{
1999 const char *pgm = external_diff();
663af342
PH
2000 struct strbuf msg;
2001 char *xfrm_msg;
2002 struct diff_filespec *one = p->one;
2003 struct diff_filespec *two = p->two;
6973dcae
JH
2004 const char *name;
2005 const char *other;
6973dcae 2006 int complete_rewrite = 0;
663af342 2007
6973dcae
JH
2008
2009 if (DIFF_PAIR_UNMERGED(p)) {
051308f6 2010 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
6973dcae
JH
2011 return;
2012 }
2013
663af342 2014 name = p->one->path;
6973dcae 2015 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
6973dcae
JH
2016 diff_fill_sha1_info(one);
2017 diff_fill_sha1_info(two);
2018
663af342 2019 strbuf_init(&msg, PATH_MAX * 2 + 300);
6973dcae
JH
2020 switch (p->status) {
2021 case DIFF_STATUS_COPIED:
663af342
PH
2022 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2023 strbuf_addstr(&msg, "\ncopy from ");
2024 quote_c_style(name, &msg, NULL, 0);
2025 strbuf_addstr(&msg, "\ncopy to ");
2026 quote_c_style(other, &msg, NULL, 0);
2027 strbuf_addch(&msg, '\n');
6973dcae
JH
2028 break;
2029 case DIFF_STATUS_RENAMED:
663af342
PH
2030 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2031 strbuf_addstr(&msg, "\nrename from ");
2032 quote_c_style(name, &msg, NULL, 0);
2033 strbuf_addstr(&msg, "\nrename to ");
2034 quote_c_style(other, &msg, NULL, 0);
2035 strbuf_addch(&msg, '\n');
6973dcae
JH
2036 break;
2037 case DIFF_STATUS_MODIFIED:
2038 if (p->score) {
663af342 2039 strbuf_addf(&msg, "dissimilarity index %d%%\n",
125b7630 2040 similarity_index(p));
6973dcae
JH
2041 complete_rewrite = 1;
2042 break;
2043 }
2044 /* fallthru */
2045 default:
2046 /* nothing */
2047 ;
2048 }
2049
a89fccd2 2050 if (hashcmp(one->sha1, two->sha1)) {
8f67f8ae 2051 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
6973dcae 2052
8f67f8ae 2053 if (DIFF_OPT_TST(o, BINARY)) {
82793c55 2054 mmfile_t mf;
29a3eefd
JH
2055 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2056 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
82793c55
JH
2057 abbrev = 40;
2058 }
663af342 2059 strbuf_addf(&msg, "index %.*s..%.*s",
dcb3450f
LT
2060 abbrev, sha1_to_hex(one->sha1),
2061 abbrev, sha1_to_hex(two->sha1));
6973dcae 2062 if (one->mode == two->mode)
663af342
PH
2063 strbuf_addf(&msg, " %06o", one->mode);
2064 strbuf_addch(&msg, '\n');
6973dcae
JH
2065 }
2066
663af342
PH
2067 if (msg.len)
2068 strbuf_setlen(&msg, msg.len - 1);
2069 xfrm_msg = msg.len ? msg.buf : NULL;
6973dcae
JH
2070
2071 if (!pgm &&
2072 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2073 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2074 /* a filepair that changes between file and symlink
2075 * needs to be split into deletion and creation.
2076 */
2077 struct diff_filespec *null = alloc_filespec(two->path);
051308f6 2078 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
6973dcae
JH
2079 free(null);
2080 null = alloc_filespec(one->path);
051308f6 2081 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
6973dcae
JH
2082 free(null);
2083 }
2084 else
051308f6 2085 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
6973dcae
JH
2086 complete_rewrite);
2087
663af342 2088 strbuf_release(&msg);
6973dcae
JH
2089}
2090
2091static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2092 struct diffstat_t *diffstat)
2093{
2094 const char *name;
2095 const char *other;
710158e3 2096 int complete_rewrite = 0;
6973dcae
JH
2097
2098 if (DIFF_PAIR_UNMERGED(p)) {
2099 /* unmerged */
0d21efa5 2100 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2101 return;
2102 }
2103
2104 name = p->one->path;
2105 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2106
2107 diff_fill_sha1_info(p->one);
2108 diff_fill_sha1_info(p->two);
2109
710158e3
JH
2110 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2111 complete_rewrite = 1;
0d21efa5 2112 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2113}
2114
88246898
JS
2115static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2116{
2117 const char *name;
2118 const char *other;
2119
2120 if (DIFF_PAIR_UNMERGED(p)) {
2121 /* unmerged */
2122 return;
2123 }
2124
2125 name = p->one->path;
2126 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2127
2128 diff_fill_sha1_info(p->one);
2129 diff_fill_sha1_info(p->two);
2130
c5a8c3ec 2131 builtin_checkdiff(name, other, p->one, p->two, o);
88246898
JS
2132}
2133
6973dcae
JH
2134void diff_setup(struct diff_options *options)
2135{
2136 memset(options, 0, sizeof(*options));
6973dcae
JH
2137 options->line_termination = '\n';
2138 options->break_opt = -1;
2139 options->rename_limit = -1;
7df7c019 2140 options->dirstat_percent = 3;
ee1e5412 2141 options->context = 3;
3969cf7d 2142 options->msg_sep = "";
6973dcae
JH
2143
2144 options->change = diff_change;
2145 options->add_remove = diff_addremove;
8f67f8ae
PH
2146 if (diff_use_color_default)
2147 DIFF_OPT_SET(options, COLOR_DIFF);
2148 else
2149 DIFF_OPT_CLR(options, COLOR_DIFF);
b68ea12e 2150 options->detect_rename = diff_detect_rename_default;
eab9a40b
JS
2151
2152 options->a_prefix = "a/";
2153 options->b_prefix = "b/";
6973dcae
JH
2154}
2155
2156int diff_setup_done(struct diff_options *options)
2157{
d7de00f7
TH
2158 int count = 0;
2159
2160 if (options->output_format & DIFF_FORMAT_NAME)
2161 count++;
2162 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2163 count++;
2164 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2165 count++;
2166 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2167 count++;
2168 if (count > 1)
2169 die("--name-only, --name-status, --check and -s are mutually exclusive");
2170
8f67f8ae 2171 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
2172 options->detect_rename = DIFF_DETECT_COPY;
2173
c6744349
TH
2174 if (options->output_format & (DIFF_FORMAT_NAME |
2175 DIFF_FORMAT_NAME_STATUS |
2176 DIFF_FORMAT_CHECKDIFF |
2177 DIFF_FORMAT_NO_OUTPUT))
2178 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2179 DIFF_FORMAT_NUMSTAT |
c6744349 2180 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2181 DIFF_FORMAT_SHORTSTAT |
7df7c019 2182 DIFF_FORMAT_DIRSTAT |
c6744349
TH
2183 DIFF_FORMAT_SUMMARY |
2184 DIFF_FORMAT_PATCH);
2185
6973dcae
JH
2186 /*
2187 * These cases always need recursive; we do not drop caller-supplied
2188 * recursive bits for other formats here.
2189 */
c6744349 2190 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2191 DIFF_FORMAT_NUMSTAT |
c6744349 2192 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2193 DIFF_FORMAT_SHORTSTAT |
7df7c019 2194 DIFF_FORMAT_DIRSTAT |
d7014dc0 2195 DIFF_FORMAT_SUMMARY |
c6744349 2196 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 2197 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2198 /*
3969cf7d 2199 * Also pickaxe would not work very well if you do not say recursive
5e363541 2200 */
3969cf7d 2201 if (options->pickaxe)
8f67f8ae 2202 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2203
6973dcae
JH
2204 if (options->detect_rename && options->rename_limit < 0)
2205 options->rename_limit = diff_rename_limit_default;
2206 if (options->setup & DIFF_SETUP_USE_CACHE) {
2207 if (!active_cache)
2208 /* read-cache does not die even when it fails
2209 * so it is safe for us to do this here. Also
2210 * it does not smudge active_cache or active_nr
2211 * when it fails, so we do not have to worry about
2212 * cleaning it up ourselves either.
2213 */
2214 read_cache();
2215 }
6973dcae
JH
2216 if (options->abbrev <= 0 || 40 < options->abbrev)
2217 options->abbrev = 40; /* full */
2218
68aacb2f
JH
2219 /*
2220 * It does not make sense to show the first hit we happened
2221 * to have found. It does not make sense not to return with
2222 * exit code in such a case either.
2223 */
8f67f8ae 2224 if (DIFF_OPT_TST(options, QUIET)) {
68aacb2f 2225 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 2226 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
2227 }
2228
2229 /*
2230 * If we postprocess in diffcore, we cannot simply return
2231 * upon the first hit. We need to run diff as usual.
2232 */
2233 if (options->pickaxe || options->filter)
8f67f8ae 2234 DIFF_OPT_CLR(options, QUIET);
68aacb2f 2235
6973dcae
JH
2236 return 0;
2237}
2238
d2543b8e 2239static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2240{
2241 char c, *eq;
2242 int len;
2243
2244 if (*arg != '-')
2245 return 0;
2246 c = *++arg;
2247 if (!c)
2248 return 0;
2249 if (c == arg_short) {
2250 c = *++arg;
2251 if (!c)
2252 return 1;
2253 if (val && isdigit(c)) {
2254 char *end;
2255 int n = strtoul(arg, &end, 10);
2256 if (*end)
2257 return 0;
2258 *val = n;
2259 return 1;
2260 }
2261 return 0;
2262 }
2263 if (c != '-')
2264 return 0;
2265 arg++;
2266 eq = strchr(arg, '=');
2267 if (eq)
2268 len = eq - arg;
2269 else
2270 len = strlen(arg);
2271 if (!len || strncmp(arg, arg_long, len))
2272 return 0;
2273 if (eq) {
2274 int n;
2275 char *end;
2276 if (!isdigit(*++eq))
2277 return 0;
2278 n = strtoul(eq, &end, 10);
2279 if (*end)
2280 return 0;
2281 *val = n;
2282 }
2283 return 1;
2284}
2285
16befb8b
JH
2286static int diff_scoreopt_parse(const char *opt);
2287
6973dcae
JH
2288int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2289{
2290 const char *arg = av[0];
d054680c
PH
2291
2292 /* Output format options */
6973dcae 2293 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2294 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2295 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2296 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2297 else if (!strcmp(arg, "--raw"))
2298 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 2299 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 2300 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 2301 else if (!strcmp(arg, "--numstat"))
74e2abe5 2302 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 2303 else if (!strcmp(arg, "--shortstat"))
ebd124c6 2304 options->output_format |= DIFF_FORMAT_SHORTSTAT;
7df7c019
LT
2305 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2306 options->output_format |= DIFF_FORMAT_DIRSTAT;
2307 else if (!strcmp(arg, "--cumulative"))
2308 options->output_format |= DIFF_FORMAT_CUMULATIVE;
d054680c
PH
2309 else if (!strcmp(arg, "--check"))
2310 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2311 else if (!strcmp(arg, "--summary"))
2312 options->output_format |= DIFF_FORMAT_SUMMARY;
2313 else if (!strcmp(arg, "--patch-with-stat"))
2314 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2315 else if (!strcmp(arg, "--name-only"))
2316 options->output_format |= DIFF_FORMAT_NAME;
2317 else if (!strcmp(arg, "--name-status"))
2318 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2319 else if (!strcmp(arg, "-s"))
2320 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
cc44c765 2321 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2322 char *end;
2323 int width = options->stat_width;
2324 int name_width = options->stat_name_width;
2325 arg += 6;
2326 end = (char *)arg;
2327
2328 switch (*arg) {
2329 case '-':
cc44c765 2330 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2331 width = strtoul(arg + 7, &end, 10);
cc44c765 2332 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2333 name_width = strtoul(arg + 12, &end, 10);
2334 break;
2335 case '=':
2336 width = strtoul(arg+1, &end, 10);
2337 if (*end == ',')
2338 name_width = strtoul(end+1, &end, 10);
2339 }
2340
2341 /* Important! This checks all the error cases! */
2342 if (*end)
2343 return 0;
c6744349 2344 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2345 options->stat_name_width = name_width;
2346 options->stat_width = width;
a2540023 2347 }
d054680c
PH
2348
2349 /* renames options */
cc44c765 2350 else if (!prefixcmp(arg, "-B")) {
8f67f8ae 2351 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2352 return -1;
2353 }
cc44c765 2354 else if (!prefixcmp(arg, "-M")) {
8f67f8ae 2355 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2356 return -1;
2357 options->detect_rename = DIFF_DETECT_RENAME;
2358 }
cc44c765 2359 else if (!prefixcmp(arg, "-C")) {
ca6c0970 2360 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
2361 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2362 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2363 return -1;
2364 options->detect_rename = DIFF_DETECT_COPY;
2365 }
d054680c
PH
2366 else if (!strcmp(arg, "--no-renames"))
2367 options->detect_rename = 0;
2368
2369 /* xdiff options */
2370 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2371 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2372 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2373 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2374 else if (!strcmp(arg, "--ignore-space-at-eol"))
2375 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2376
2377 /* flags options */
2378 else if (!strcmp(arg, "--binary")) {
2379 options->output_format |= DIFF_FORMAT_PATCH;
2380 DIFF_OPT_SET(options, BINARY);
2381 }
2382 else if (!strcmp(arg, "--full-index"))
2383 DIFF_OPT_SET(options, FULL_INDEX);
2384 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2385 DIFF_OPT_SET(options, TEXT);
2386 else if (!strcmp(arg, "-R"))
2387 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 2388 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 2389 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 2390 else if (!strcmp(arg, "--follow"))
8f67f8ae 2391 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 2392 else if (!strcmp(arg, "--color"))
8f67f8ae 2393 DIFF_OPT_SET(options, COLOR_DIFF);
fef88bb0 2394 else if (!strcmp(arg, "--no-color"))
8f67f8ae 2395 DIFF_OPT_CLR(options, COLOR_DIFF);
f59a59e2 2396 else if (!strcmp(arg, "--color-words"))
8f67f8ae 2397 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
41bbf9d5 2398 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 2399 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 2400 else if (!strcmp(arg, "--quiet"))
8f67f8ae 2401 DIFF_OPT_SET(options, QUIET);
72909bef 2402 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 2403 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 2404 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 2405 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
d054680c
PH
2406
2407 /* misc options */
2408 else if (!strcmp(arg, "-z"))
2409 options->line_termination = 0;
2410 else if (!prefixcmp(arg, "-l"))
2411 options->rename_limit = strtoul(arg+2, NULL, 10);
2412 else if (!prefixcmp(arg, "-S"))
2413 options->pickaxe = arg + 2;
2414 else if (!strcmp(arg, "--pickaxe-all"))
2415 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2416 else if (!strcmp(arg, "--pickaxe-regex"))
2417 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2418 else if (!prefixcmp(arg, "-O"))
2419 options->orderfile = arg + 2;
2420 else if (!prefixcmp(arg, "--diff-filter="))
2421 options->filter = arg + 14;
2422 else if (!strcmp(arg, "--abbrev"))
2423 options->abbrev = DEFAULT_ABBREV;
2424 else if (!prefixcmp(arg, "--abbrev=")) {
2425 options->abbrev = strtoul(arg + 9, NULL, 10);
2426 if (options->abbrev < MINIMUM_ABBREV)
2427 options->abbrev = MINIMUM_ABBREV;
2428 else if (40 < options->abbrev)
2429 options->abbrev = 40;
2430 }
eab9a40b
JS
2431 else if (!prefixcmp(arg, "--src-prefix="))
2432 options->a_prefix = arg + 13;
2433 else if (!prefixcmp(arg, "--dst-prefix="))
2434 options->b_prefix = arg + 13;
2435 else if (!strcmp(arg, "--no-prefix"))
2436 options->a_prefix = options->b_prefix = "";
6973dcae
JH
2437 else
2438 return 0;
2439 return 1;
2440}
2441
2442static int parse_num(const char **cp_p)
2443{
2444 unsigned long num, scale;
2445 int ch, dot;
2446 const char *cp = *cp_p;
2447
2448 num = 0;
2449 scale = 1;
2450 dot = 0;
2451 for(;;) {
2452 ch = *cp;
2453 if ( !dot && ch == '.' ) {
2454 scale = 1;
2455 dot = 1;
2456 } else if ( ch == '%' ) {
2457 scale = dot ? scale*100 : 100;
2458 cp++; /* % is always at the end */
2459 break;
2460 } else if ( ch >= '0' && ch <= '9' ) {
2461 if ( scale < 100000 ) {
2462 scale *= 10;
2463 num = (num*10) + (ch-'0');
2464 }
2465 } else {
2466 break;
2467 }
2468 cp++;
2469 }
2470 *cp_p = cp;
2471
2472 /* user says num divided by scale and we say internally that
2473 * is MAX_SCORE * num / scale.
2474 */
dc49cd76 2475 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2476}
2477
16befb8b 2478static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2479{
2480 int opt1, opt2, cmd;
2481
2482 if (*opt++ != '-')
2483 return -1;
2484 cmd = *opt++;
2485 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2486 return -1; /* that is not a -M, -C nor -B option */
2487
2488 opt1 = parse_num(&opt);
2489 if (cmd != 'B')
2490 opt2 = 0;
2491 else {
2492 if (*opt == 0)
2493 opt2 = 0;
2494 else if (*opt != '/')
2495 return -1; /* we expect -B80/99 or -B80 */
2496 else {
2497 opt++;
2498 opt2 = parse_num(&opt);
2499 }
2500 }
2501 if (*opt != 0)
2502 return -1;
2503 return opt1 | (opt2 << 16);
2504}
2505
2506struct diff_queue_struct diff_queued_diff;
2507
2508void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2509{
2510 if (queue->alloc <= queue->nr) {
2511 queue->alloc = alloc_nr(queue->alloc);
2512 queue->queue = xrealloc(queue->queue,
2513 sizeof(dp) * queue->alloc);
2514 }
2515 queue->queue[queue->nr++] = dp;
2516}
2517
2518struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2519 struct diff_filespec *one,
2520 struct diff_filespec *two)
2521{
ef677686 2522 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2523 dp->one = one;
2524 dp->two = two;
6973dcae
JH
2525 if (queue)
2526 diff_q(queue, dp);
2527 return dp;
2528}
2529
2530void diff_free_filepair(struct diff_filepair *p)
2531{
9fb88419
LT
2532 free_filespec(p->one);
2533 free_filespec(p->two);
6973dcae
JH
2534 free(p);
2535}
2536
2537/* This is different from find_unique_abbrev() in that
2538 * it stuffs the result with dots for alignment.
2539 */
2540const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2541{
2542 int abblen;
2543 const char *abbrev;
2544 if (len == 40)
2545 return sha1_to_hex(sha1);
2546
2547 abbrev = find_unique_abbrev(sha1, len);
2548 if (!abbrev)
2549 return sha1_to_hex(sha1);
2550 abblen = strlen(abbrev);
2551 if (abblen < 37) {
2552 static char hex[41];
2553 if (len < abblen && abblen <= len + 2)
2554 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2555 else
2556 sprintf(hex, "%s...", abbrev);
2557 return hex;
2558 }
2559 return sha1_to_hex(sha1);
2560}
2561
663af342 2562static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 2563{
663af342
PH
2564 int line_termination = opt->line_termination;
2565 int inter_name_termination = line_termination ? '\t' : '\0';
6973dcae 2566
663af342
PH
2567 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
2568 printf(":%06o %06o %s ", p->one->mode, p->two->mode,
2569 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2570 printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
6973dcae 2571 }
663af342
PH
2572 if (p->score) {
2573 printf("%c%03d%c", p->status, similarity_index(p),
2574 inter_name_termination);
2575 } else {
2576 printf("%c%c", p->status, inter_name_termination);
6973dcae 2577 }
6973dcae 2578
663af342
PH
2579 if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
2580 write_name_quoted(p->one->path, stdout, inter_name_termination);
2581 write_name_quoted(p->two->path, stdout, line_termination);
2582 } else {
2583 const char *path = p->one->mode ? p->one->path : p->two->path;
2584 write_name_quoted(path, stdout, line_termination);
2585 }
6973dcae
JH
2586}
2587
2588int diff_unmodified_pair(struct diff_filepair *p)
2589{
2590 /* This function is written stricter than necessary to support
2591 * the currently implemented transformers, but the idea is to
2592 * let transformers to produce diff_filepairs any way they want,
2593 * and filter and clean them up here before producing the output.
2594 */
663af342 2595 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
2596
2597 if (DIFF_PAIR_UNMERGED(p))
2598 return 0; /* unmerged is interesting */
2599
6973dcae
JH
2600 /* deletion, addition, mode or type change
2601 * and rename are all interesting.
2602 */
2603 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2604 DIFF_PAIR_MODE_CHANGED(p) ||
2605 strcmp(one->path, two->path))
2606 return 0;
2607
2608 /* both are valid and point at the same path. that is, we are
2609 * dealing with a change.
2610 */
2611 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2612 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2613 return 1; /* no change */
2614 if (!one->sha1_valid && !two->sha1_valid)
2615 return 1; /* both look at the same file on the filesystem. */
2616 return 0;
2617}
2618
2619static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2620{
2621 if (diff_unmodified_pair(p))
2622 return;
2623
2624 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2625 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2626 return; /* no tree diffs in patch format */
2627
2628 run_diff(p, o);
2629}
2630
2631static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2632 struct diffstat_t *diffstat)
2633{
2634 if (diff_unmodified_pair(p))
2635 return;
2636
2637 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2638 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2639 return; /* no tree diffs in patch format */
2640
2641 run_diffstat(p, o, diffstat);
2642}
2643
88246898
JS
2644static void diff_flush_checkdiff(struct diff_filepair *p,
2645 struct diff_options *o)
2646{
2647 if (diff_unmodified_pair(p))
2648 return;
2649
2650 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2651 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2652 return; /* no tree diffs in patch format */
2653
2654 run_checkdiff(p, o);
2655}
2656
6973dcae
JH
2657int diff_queue_is_empty(void)
2658{
2659 struct diff_queue_struct *q = &diff_queued_diff;
2660 int i;
2661 for (i = 0; i < q->nr; i++)
2662 if (!diff_unmodified_pair(q->queue[i]))
2663 return 0;
2664 return 1;
2665}
2666
2667#if DIFF_DEBUG
2668void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2669{
2670 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2671 x, one ? one : "",
2672 s->path,
2673 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2674 s->mode,
2675 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2676 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2677 x, one ? one : "",
2678 s->size, s->xfrm_flags);
2679}
2680
2681void diff_debug_filepair(const struct diff_filepair *p, int i)
2682{
2683 diff_debug_filespec(p->one, i, "one");
2684 diff_debug_filespec(p->two, i, "two");
64479711 2685 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
6973dcae 2686 p->score, p->status ? p->status : '?',
64479711 2687 p->one->rename_used, p->broken_pair);
6973dcae
JH
2688}
2689
2690void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2691{
2692 int i;
2693 if (msg)
2694 fprintf(stderr, "%s\n", msg);
2695 fprintf(stderr, "q->nr = %d\n", q->nr);
2696 for (i = 0; i < q->nr; i++) {
2697 struct diff_filepair *p = q->queue[i];
2698 diff_debug_filepair(p, i);
2699 }
2700}
2701#endif
2702
2703static void diff_resolve_rename_copy(void)
2704{
64479711
LT
2705 int i;
2706 struct diff_filepair *p;
6973dcae
JH
2707 struct diff_queue_struct *q = &diff_queued_diff;
2708
2709 diff_debug_queue("resolve-rename-copy", q);
2710
2711 for (i = 0; i < q->nr; i++) {
2712 p = q->queue[i];
2713 p->status = 0; /* undecided */
2714 if (DIFF_PAIR_UNMERGED(p))
2715 p->status = DIFF_STATUS_UNMERGED;
2716 else if (!DIFF_FILE_VALID(p->one))
2717 p->status = DIFF_STATUS_ADDED;
2718 else if (!DIFF_FILE_VALID(p->two))
2719 p->status = DIFF_STATUS_DELETED;
2720 else if (DIFF_PAIR_TYPE_CHANGED(p))
2721 p->status = DIFF_STATUS_TYPE_CHANGED;
2722
2723 /* from this point on, we are dealing with a pair
2724 * whose both sides are valid and of the same type, i.e.
2725 * either in-place edit or rename/copy edit.
2726 */
2727 else if (DIFF_PAIR_RENAME(p)) {
64479711
LT
2728 /*
2729 * A rename might have re-connected a broken
2730 * pair up, causing the pathnames to be the
2731 * same again. If so, that's not a rename at
2732 * all, just a modification..
2733 *
2734 * Otherwise, see if this source was used for
2735 * multiple renames, in which case we decrement
2736 * the count, and call it a copy.
6973dcae 2737 */
64479711
LT
2738 if (!strcmp(p->one->path, p->two->path))
2739 p->status = DIFF_STATUS_MODIFIED;
2740 else if (--p->one->rename_used > 0)
6973dcae 2741 p->status = DIFF_STATUS_COPIED;
64479711 2742 else
6973dcae
JH
2743 p->status = DIFF_STATUS_RENAMED;
2744 }
a89fccd2 2745 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2746 p->one->mode != p->two->mode ||
2747 is_null_sha1(p->one->sha1))
6973dcae
JH
2748 p->status = DIFF_STATUS_MODIFIED;
2749 else {
2750 /* This is a "no-change" entry and should not
2751 * happen anymore, but prepare for broken callers.
2752 */
2753 error("feeding unmodified %s to diffcore",
2754 p->one->path);
2755 p->status = DIFF_STATUS_UNKNOWN;
2756 }
2757 }
2758 diff_debug_queue("resolve-rename-copy done", q);
2759}
2760
c6744349 2761static int check_pair_status(struct diff_filepair *p)
6973dcae 2762{
6973dcae
JH
2763 switch (p->status) {
2764 case DIFF_STATUS_UNKNOWN:
c6744349 2765 return 0;
6973dcae
JH
2766 case 0:
2767 die("internal error in diff-resolve-rename-copy");
6973dcae 2768 default:
c6744349 2769 return 1;
6973dcae
JH
2770 }
2771}
2772
c6744349
TH
2773static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2774{
2775 int fmt = opt->output_format;
2776
2777 if (fmt & DIFF_FORMAT_CHECKDIFF)
2778 diff_flush_checkdiff(p, opt);
2779 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2780 diff_flush_raw(p, opt);
2781 else if (fmt & DIFF_FORMAT_NAME)
663af342 2782 write_name_quoted(p->two->path, stdout, opt->line_termination);
c6744349
TH
2783}
2784
4bbd261b
SE
2785static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2786{
2787 if (fs->mode)
663af342 2788 printf(" %s mode %06o ", newdelete, fs->mode);
4bbd261b 2789 else
663af342
PH
2790 printf(" %s ", newdelete);
2791 write_name_quoted(fs->path, stdout, '\n');
4bbd261b
SE
2792}
2793
2794
2795static void show_mode_change(struct diff_filepair *p, int show_name)
2796{
2797 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
663af342
PH
2798 printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
2799 show_name ? ' ' : '\n');
0d26a64e 2800 if (show_name) {
663af342 2801 write_name_quoted(p->two->path, stdout, '\n');
0d26a64e 2802 }
4bbd261b
SE
2803 }
2804}
2805
2806static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2807{
b9f44164 2808 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2809
125b7630 2810 printf(" %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 2811 free(names);
4bbd261b
SE
2812 show_mode_change(p, 0);
2813}
2814
2815static void diff_summary(struct diff_filepair *p)
2816{
2817 switch(p->status) {
2818 case DIFF_STATUS_DELETED:
2819 show_file_mode_name("delete", p->one);
2820 break;
2821 case DIFF_STATUS_ADDED:
2822 show_file_mode_name("create", p->two);
2823 break;
2824 case DIFF_STATUS_COPIED:
2825 show_rename_copy("copy", p);
2826 break;
2827 case DIFF_STATUS_RENAMED:
2828 show_rename_copy("rename", p);
2829 break;
2830 default:
2831 if (p->score) {
f8b6809d 2832 fputs(" rewrite ", stdout);
663af342
PH
2833 write_name_quoted(p->two->path, stdout, ' ');
2834 printf("(%d%%)\n", similarity_index(p));
2835 }
2836 show_mode_change(p, !p->score);
4bbd261b
SE
2837 break;
2838 }
2839}
2840
fcb3d0ad
JS
2841struct patch_id_t {
2842 struct xdiff_emit_state xm;
2843 SHA_CTX *ctx;
2844 int patchlen;
2845};
2846
2847static int remove_space(char *line, int len)
2848{
2849 int i;
663af342
PH
2850 char *dst = line;
2851 unsigned char c;
fcb3d0ad 2852
663af342
PH
2853 for (i = 0; i < len; i++)
2854 if (!isspace((c = line[i])))
2855 *dst++ = c;
fcb3d0ad 2856
663af342 2857 return dst - line;
fcb3d0ad
JS
2858}
2859
2860static void patch_id_consume(void *priv, char *line, unsigned long len)
2861{
2862 struct patch_id_t *data = priv;
2863 int new_len;
2864
2865 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 2866 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
2867 return;
2868
2869 new_len = remove_space(line, len);
2870
2871 SHA1_Update(data->ctx, line, new_len);
2872 data->patchlen += new_len;
2873}
2874
2875/* returns 0 upon success, and writes result into sha1 */
2876static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2877{
2878 struct diff_queue_struct *q = &diff_queued_diff;
2879 int i;
2880 SHA_CTX ctx;
2881 struct patch_id_t data;
2882 char buffer[PATH_MAX * 4 + 20];
2883
2884 SHA1_Init(&ctx);
2885 memset(&data, 0, sizeof(struct patch_id_t));
2886 data.ctx = &ctx;
2887 data.xm.consume = patch_id_consume;
2888
2889 for (i = 0; i < q->nr; i++) {
2890 xpparam_t xpp;
2891 xdemitconf_t xecfg;
2892 xdemitcb_t ecb;
2893 mmfile_t mf1, mf2;
2894 struct diff_filepair *p = q->queue[i];
2895 int len1, len2;
2896
30b25010 2897 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
2898 if (p->status == 0)
2899 return error("internal diff status error");
2900 if (p->status == DIFF_STATUS_UNKNOWN)
2901 continue;
2902 if (diff_unmodified_pair(p))
2903 continue;
2904 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2905 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2906 continue;
2907 if (DIFF_PAIR_UNMERGED(p))
2908 continue;
2909
2910 diff_fill_sha1_info(p->one);
2911 diff_fill_sha1_info(p->two);
2912 if (fill_mmfile(&mf1, p->one) < 0 ||
2913 fill_mmfile(&mf2, p->two) < 0)
2914 return error("unable to read files to diff");
2915
fcb3d0ad
JS
2916 len1 = remove_space(p->one->path, strlen(p->one->path));
2917 len2 = remove_space(p->two->path, strlen(p->two->path));
2918 if (p->one->mode == 0)
2919 len1 = snprintf(buffer, sizeof(buffer),
2920 "diff--gita/%.*sb/%.*s"
2921 "newfilemode%06o"
2922 "---/dev/null"
2923 "+++b/%.*s",
2924 len1, p->one->path,
2925 len2, p->two->path,
2926 p->two->mode,
2927 len2, p->two->path);
2928 else if (p->two->mode == 0)
2929 len1 = snprintf(buffer, sizeof(buffer),
2930 "diff--gita/%.*sb/%.*s"
2931 "deletedfilemode%06o"
2932 "---a/%.*s"
2933 "+++/dev/null",
2934 len1, p->one->path,
2935 len2, p->two->path,
2936 p->one->mode,
2937 len1, p->one->path);
2938 else
2939 len1 = snprintf(buffer, sizeof(buffer),
2940 "diff--gita/%.*sb/%.*s"
2941 "---a/%.*s"
2942 "+++b/%.*s",
2943 len1, p->one->path,
2944 len2, p->two->path,
2945 len1, p->one->path,
2946 len2, p->two->path);
2947 SHA1_Update(&ctx, buffer, len1);
2948
2949 xpp.flags = XDF_NEED_MINIMAL;
2950 xecfg.ctxlen = 3;
9fdc3bb5 2951 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
2952 ecb.outf = xdiff_outf;
2953 ecb.priv = &data;
c279d7e9 2954 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
fcb3d0ad
JS
2955 }
2956
2957 SHA1_Final(sha1, &ctx);
2958 return 0;
2959}
2960
2961int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2962{
2963 struct diff_queue_struct *q = &diff_queued_diff;
2964 int i;
2965 int result = diff_get_patch_id(options, sha1);
2966
2967 for (i = 0; i < q->nr; i++)
2968 diff_free_filepair(q->queue[i]);
2969
2970 free(q->queue);
2971 q->queue = NULL;
2972 q->nr = q->alloc = 0;
2973
2974 return result;
2975}
2976
946c3784 2977static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 2978{
6973dcae 2979 int i;
6973dcae 2980
946c3784
TH
2981 for (i = 0; i < q->nr; i++) {
2982 const struct diff_filepair *p = q->queue[i];
2983
2984 switch (p->status) {
2985 case DIFF_STATUS_DELETED:
2986 case DIFF_STATUS_ADDED:
2987 case DIFF_STATUS_COPIED:
2988 case DIFF_STATUS_RENAMED:
2989 return 0;
2990 default:
2991 if (p->score)
2992 return 0;
2993 if (p->one->mode && p->two->mode &&
2994 p->one->mode != p->two->mode)
2995 return 0;
2996 break;
2997 }
6973dcae 2998 }
946c3784
TH
2999 return 1;
3000}
3001
6973dcae
JH
3002void diff_flush(struct diff_options *options)
3003{
3004 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 3005 int i, output_format = options->output_format;
946c3784 3006 int separator = 0;
6973dcae 3007
c6744349
TH
3008 /*
3009 * Order: raw, stat, summary, patch
3010 * or: name/name-status/checkdiff (other bits clear)
3011 */
946c3784
TH
3012 if (!q->nr)
3013 goto free_queue;
6973dcae 3014
c6744349
TH
3015 if (output_format & (DIFF_FORMAT_RAW |
3016 DIFF_FORMAT_NAME |
3017 DIFF_FORMAT_NAME_STATUS |
3018 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
3019 for (i = 0; i < q->nr; i++) {
3020 struct diff_filepair *p = q->queue[i];
c6744349
TH
3021 if (check_pair_status(p))
3022 flush_one_pair(p, options);
6973dcae 3023 }
946c3784 3024 separator++;
6973dcae 3025 }
c6744349 3026
7df7c019 3027 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIRSTAT)) {
5e2b0636 3028 struct diffstat_t diffstat;
c6744349 3029
5e2b0636
TH
3030 memset(&diffstat, 0, sizeof(struct diffstat_t));
3031 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
3032 for (i = 0; i < q->nr; i++) {
3033 struct diff_filepair *p = q->queue[i];
c6744349 3034 if (check_pair_status(p))
5e2b0636 3035 diff_flush_stat(p, options, &diffstat);
6973dcae 3036 }
7df7c019
LT
3037 if (output_format & DIFF_FORMAT_DIRSTAT)
3038 show_dirstat(&diffstat, options);
74e2abe5
JH
3039 if (output_format & DIFF_FORMAT_NUMSTAT)
3040 show_numstat(&diffstat, options);
3041 if (output_format & DIFF_FORMAT_DIFFSTAT)
3042 show_stats(&diffstat, options);
f604652e 3043 if (output_format & DIFF_FORMAT_SHORTSTAT)
ebd124c6 3044 show_shortstats(&diffstat);
f604652e 3045 free_diffstat_info(&diffstat);
3969cf7d 3046 separator++;
6973dcae
JH
3047 }
3048
946c3784 3049 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349
TH
3050 for (i = 0; i < q->nr; i++)
3051 diff_summary(q->queue[i]);
3969cf7d 3052 separator++;
6973dcae
JH
3053 }
3054
c6744349 3055 if (output_format & DIFF_FORMAT_PATCH) {
946c3784
TH
3056 if (separator) {
3057 if (options->stat_sep) {
3058 /* attach patch instead of inline */
c6744349 3059 fputs(options->stat_sep, stdout);
946c3784 3060 } else {
c6744349 3061 putchar(options->line_termination);
946c3784 3062 }
c6744349
TH
3063 }
3064
3065 for (i = 0; i < q->nr; i++) {
3066 struct diff_filepair *p = q->queue[i];
3067 if (check_pair_status(p))
3068 diff_flush_patch(p, options);
3069 }
4bbd261b
SE
3070 }
3071
04245581
JK
3072 if (output_format & DIFF_FORMAT_CALLBACK)
3073 options->format_callback(q, options, options->format_callback_data);
3074
c6744349
TH
3075 for (i = 0; i < q->nr; i++)
3076 diff_free_filepair(q->queue[i]);
946c3784 3077free_queue:
6973dcae
JH
3078 free(q->queue);
3079 q->queue = NULL;
3080 q->nr = q->alloc = 0;
3081}
3082
3083static void diffcore_apply_filter(const char *filter)
3084{
3085 int i;
3086 struct diff_queue_struct *q = &diff_queued_diff;
3087 struct diff_queue_struct outq;
3088 outq.queue = NULL;
3089 outq.nr = outq.alloc = 0;
3090
3091 if (!filter)
3092 return;
3093
3094 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3095 int found;
3096 for (i = found = 0; !found && i < q->nr; i++) {
3097 struct diff_filepair *p = q->queue[i];
3098 if (((p->status == DIFF_STATUS_MODIFIED) &&
3099 ((p->score &&
3100 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3101 (!p->score &&
3102 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3103 ((p->status != DIFF_STATUS_MODIFIED) &&
3104 strchr(filter, p->status)))
3105 found++;
3106 }
3107 if (found)
3108 return;
3109
3110 /* otherwise we will clear the whole queue
3111 * by copying the empty outq at the end of this
3112 * function, but first clear the current entries
3113 * in the queue.
3114 */
3115 for (i = 0; i < q->nr; i++)
3116 diff_free_filepair(q->queue[i]);
3117 }
3118 else {
3119 /* Only the matching ones */
3120 for (i = 0; i < q->nr; i++) {
3121 struct diff_filepair *p = q->queue[i];
3122
3123 if (((p->status == DIFF_STATUS_MODIFIED) &&
3124 ((p->score &&
3125 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3126 (!p->score &&
3127 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3128 ((p->status != DIFF_STATUS_MODIFIED) &&
3129 strchr(filter, p->status)))
3130 diff_q(&outq, p);
3131 else
3132 diff_free_filepair(p);
3133 }
3134 }
3135 free(q->queue);
3136 *q = outq;
3137}
3138
5701115a
SV
3139/* Check whether two filespecs with the same mode and size are identical */
3140static int diff_filespec_is_identical(struct diff_filespec *one,
3141 struct diff_filespec *two)
3142{
3143 if (S_ISGITLINK(one->mode)) {
3144 diff_fill_sha1_info(one);
3145 diff_fill_sha1_info(two);
3146 return !hashcmp(one->sha1, two->sha1);
3147 }
3148 if (diff_populate_filespec(one, 0))
3149 return 0;
3150 if (diff_populate_filespec(two, 0))
3151 return 0;
3152 return !memcmp(one->data, two->data, one->size);
3153}
3154
fb13227e
JH
3155static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3156{
3157 int i;
3158 struct diff_queue_struct *q = &diff_queued_diff;
3159 struct diff_queue_struct outq;
3160 outq.queue = NULL;
3161 outq.nr = outq.alloc = 0;
3162
3163 for (i = 0; i < q->nr; i++) {
3164 struct diff_filepair *p = q->queue[i];
3165
3166 /*
3167 * 1. Entries that come from stat info dirtyness
3168 * always have both sides (iow, not create/delete),
3169 * one side of the object name is unknown, with
3170 * the same mode and size. Keep the ones that
3171 * do not match these criteria. They have real
3172 * differences.
3173 *
3174 * 2. At this point, the file is known to be modified,
3175 * with the same mode and size, and the object
3176 * name of one side is unknown. Need to inspect
3177 * the identical contents.
3178 */
3179 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3180 !DIFF_FILE_VALID(p->two) ||
3181 (p->one->sha1_valid && p->two->sha1_valid) ||
3182 (p->one->mode != p->two->mode) ||
3183 diff_populate_filespec(p->one, 1) ||
3184 diff_populate_filespec(p->two, 1) ||
3185 (p->one->size != p->two->size) ||
5701115a 3186 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
fb13227e
JH
3187 diff_q(&outq, p);
3188 else {
3189 /*
3190 * The caller can subtract 1 from skip_stat_unmatch
3191 * to determine how many paths were dirty only
3192 * due to stat info mismatch.
3193 */
8f67f8ae 3194 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
6d2d9e86 3195 diffopt->skip_stat_unmatch++;
fb13227e
JH
3196 diff_free_filepair(p);
3197 }
3198 }
3199 free(q->queue);
3200 *q = outq;
3201}
3202
6973dcae
JH
3203void diffcore_std(struct diff_options *options)
3204{
8f67f8ae 3205 if (DIFF_OPT_TST(options, QUIET))
68aacb2f 3206 return;
706098af 3207
8f67f8ae 3208 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
fb13227e 3209 diffcore_skip_stat_unmatch(options);
6973dcae
JH
3210 if (options->break_opt != -1)
3211 diffcore_break(options->break_opt);
3212 if (options->detect_rename)
3213 diffcore_rename(options);
3214 if (options->break_opt != -1)
3215 diffcore_merge_broken();
3216 if (options->pickaxe)
3217 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3218 if (options->orderfile)
3219 diffcore_order(options->orderfile);
3220 diff_resolve_rename_copy();
3221 diffcore_apply_filter(options->filter);
68aacb2f 3222
8f67f8ae
PH
3223 if (diff_queued_diff.nr)
3224 DIFF_OPT_SET(options, HAS_CHANGES);
3225 else
3226 DIFF_OPT_CLR(options, HAS_CHANGES);
6973dcae
JH
3227}
3228
da31b358
JH
3229int diff_result_code(struct diff_options *opt, int status)
3230{
3231 int result = 0;
3232 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3233 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3234 return status;
3235 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3236 DIFF_OPT_TST(opt, HAS_CHANGES))
3237 result |= 01;
3238 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3239 DIFF_OPT_TST(opt, CHECK_FAILED))
3240 result |= 02;
3241 return result;
3242}
6973dcae 3243
6973dcae
JH
3244void diff_addremove(struct diff_options *options,
3245 int addremove, unsigned mode,
3246 const unsigned char *sha1,
3247 const char *base, const char *path)
3248{
3249 char concatpath[PATH_MAX];
3250 struct diff_filespec *one, *two;
3251
3252 /* This may look odd, but it is a preparation for
3253 * feeding "there are unchanged files which should
3254 * not produce diffs, but when you are doing copy
3255 * detection you would need them, so here they are"
3256 * entries to the diff-core. They will be prefixed
3257 * with something like '=' or '*' (I haven't decided
3258 * which but should not make any difference).
a6080a0a 3259 * Feeding the same new and old to diff_change()
6973dcae
JH
3260 * also has the same effect.
3261 * Before the final output happens, they are pruned after
3262 * merged into rename/copy pairs as appropriate.
3263 */
8f67f8ae 3264 if (DIFF_OPT_TST(options, REVERSE_DIFF))
6973dcae
JH
3265 addremove = (addremove == '+' ? '-' :
3266 addremove == '-' ? '+' : addremove);
3267
3268 if (!path) path = "";
3269 sprintf(concatpath, "%s%s", base, path);
3270 one = alloc_filespec(concatpath);
3271 two = alloc_filespec(concatpath);
3272
3273 if (addremove != '+')
3274 fill_filespec(one, sha1, mode);
3275 if (addremove != '-')
3276 fill_filespec(two, sha1, mode);
3277
3278 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3279 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3280}
3281
3282void diff_change(struct diff_options *options,
3283 unsigned old_mode, unsigned new_mode,
3284 const unsigned char *old_sha1,
3285 const unsigned char *new_sha1,
a6080a0a 3286 const char *base, const char *path)
6973dcae
JH
3287{
3288 char concatpath[PATH_MAX];
3289 struct diff_filespec *one, *two;
3290
8f67f8ae 3291 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
6973dcae
JH
3292 unsigned tmp;
3293 const unsigned char *tmp_c;
3294 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3295 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3296 }
3297 if (!path) path = "";
3298 sprintf(concatpath, "%s%s", base, path);
3299 one = alloc_filespec(concatpath);
3300 two = alloc_filespec(concatpath);
3301 fill_filespec(one, old_sha1, old_mode);
3302 fill_filespec(two, new_sha1, new_mode);
3303
3304 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3305 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3306}
3307
3308void diff_unmerge(struct diff_options *options,
e9c84099
JH
3309 const char *path,
3310 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3311{
3312 struct diff_filespec *one, *two;
3313 one = alloc_filespec(path);
3314 two = alloc_filespec(path);
e9c84099
JH
3315 fill_filespec(one, sha1, mode);
3316 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3317}