Update drart release notes to 1.7.5
[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"
be58e70d 14#include "userdiff.h"
4a16d072 15#include "sigchain.h"
752c0c24 16#include "submodule.h"
a757c646 17#include "ll-merge.h"
6973dcae 18
1510fea7
SP
19#ifdef NO_FAST_WORKING_DIRECTORY
20#define FAST_WORKING_DIRECTORY 0
21#else
22#define FAST_WORKING_DIRECTORY 1
23#endif
24
96f1e58f 25static int diff_detect_rename_default;
92c57e5c 26static int diff_rename_limit_default = 400;
a624eaa7 27static int diff_suppress_blank_empty;
6b2f2d98 28int diff_use_color_default = -1;
98a4d87b 29static const char *diff_word_regex_cfg;
cbe02100 30static const char *external_diff_cmd_cfg;
aecbf914 31int diff_auto_refresh_index = 1;
a5a818ee 32static int diff_mnemonic_prefix;
f89504dd 33static int diff_no_prefix;
be4f2b40 34static struct diff_options default_diff_options;
6973dcae 35
7c92fe0e 36static char diff_colors[][COLOR_MAXLEN] = {
dc6ebd4c
AL
37 GIT_COLOR_RESET,
38 GIT_COLOR_NORMAL, /* PLAIN */
39 GIT_COLOR_BOLD, /* METAINFO */
40 GIT_COLOR_CYAN, /* FRAGINFO */
41 GIT_COLOR_RED, /* OLD */
42 GIT_COLOR_GREEN, /* NEW */
43 GIT_COLOR_YELLOW, /* COMMIT */
44 GIT_COLOR_BG_RED, /* WHITESPACE */
89cb73a1 45 GIT_COLOR_NORMAL, /* FUNCINFO */
cd112cef
JS
46};
47
801235c5
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48static int parse_diff_color_slot(const char *var, int ofs)
49{
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
ce436973
JK
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
448c3ef1
JH
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
89cb73a1
BW
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
8b8e8624 66 return -1;
801235c5
JH
67}
68
cced5fbc
LT
69static int git_config_rename(const char *var, const char *value)
70{
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76}
77
83ad63cf
JH
78/*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
ef90d6d4 84int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 85{
a159ca0c 86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
0f6f5a40 87 diff_use_color_default = git_config_colorbool(var, value, -1);
801235c5
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88 return 0;
89 }
b68ea12e 90 if (!strcmp(var, "diff.renames")) {
cced5fbc 91 diff_detect_rename_default = git_config_rename(var, value);
b68ea12e
EW
92 return 0;
93 }
aecbf914
JH
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
a5a818ee
JH
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
f89504dd
EC
102 if (!strcmp(var, "diff.noprefix")) {
103 diff_no_prefix = git_config_bool(var, value);
104 return 0;
105 }
daec808c
BH
106 if (!strcmp(var, "diff.external"))
107 return git_config_string(&external_diff_cmd_cfg, var, value);
98a4d87b
BSSJ
108 if (!strcmp(var, "diff.wordregex"))
109 return git_config_string(&diff_word_regex_cfg, var, value);
f1af60bd 110
be4f2b40
JS
111 if (!strcmp(var, "diff.ignoresubmodules"))
112 handle_ignore_submodules_arg(&default_diff_options, value);
113
ef90d6d4 114 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
115}
116
ef90d6d4 117int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 118{
2b6ca6df
LT
119 if (!strcmp(var, "diff.renamelimit")) {
120 diff_rename_limit_default = git_config_int(var, value);
121 return 0;
122 }
123
c7534ef4
JK
124 switch (userdiff_config(var, value)) {
125 case 0: break;
126 case -1: return -1;
127 default: return 0;
128 }
129
1968d77d 130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 131 int slot = parse_diff_color_slot(var, 11);
8b8e8624
JK
132 if (slot < 0)
133 return 0;
64f30e94
JH
134 if (!value)
135 return config_error_nonbool(var);
7c92fe0e 136 color_parse(value, var, diff_colors[slot]);
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137 return 0;
138 }
f1af60bd 139
a624eaa7 140 /* like GNU diff's --suppress-blank-empty option */
950db879
JS
141 if (!strcmp(var, "diff.suppressblankempty") ||
142 /* for backwards compatibility */
143 !strcmp(var, "diff.suppress-blank-empty")) {
a624eaa7
JM
144 diff_suppress_blank_empty = git_config_bool(var, value);
145 return 0;
146 }
147
aee9c7d6
JL
148 if (!prefixcmp(var, "submodule."))
149 return parse_submodule_config_option(var, value);
150
ef90d6d4 151 return git_color_default_config(var, value, cb);
801235c5
JH
152}
153
6973dcae
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154static char *quote_two(const char *one, const char *two)
155{
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
f285a2d7 158 struct strbuf res = STRBUF_INIT;
6973dcae
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159
160 if (need_one + need_two) {
663af342
PH
161 strbuf_addch(&res, '"');
162 quote_c_style(one, &res, NULL, 1);
163 quote_c_style(two, &res, NULL, 1);
164 strbuf_addch(&res, '"');
165 } else {
166 strbuf_addstr(&res, one);
167 strbuf_addstr(&res, two);
6973dcae 168 }
b315c5c0 169 return strbuf_detach(&res, NULL);
6973dcae
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170}
171
172static const char *external_diff(void)
173{
174 static const char *external_diff_cmd = NULL;
175 static int done_preparing = 0;
176
177 if (done_preparing)
178 return external_diff_cmd;
179 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
cbe02100
JS
180 if (!external_diff_cmd)
181 external_diff_cmd = external_diff_cmd_cfg;
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182 done_preparing = 1;
183 return external_diff_cmd;
184}
185
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186static struct diff_tempfile {
187 const char *name; /* filename external diff should read from */
188 char hex[41];
189 char mode[10];
1472966c 190 char tmp_path[PATH_MAX];
6973dcae
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191} diff_temp[2];
192
6957eb9a
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193typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
194
195struct emit_callback {
6957eb9a
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196 int color_diff;
197 unsigned ws_rule;
198 int blank_at_eof_in_preimage;
199 int blank_at_eof_in_postimage;
200 int lno_in_preimage;
201 int lno_in_postimage;
202 sane_truncate_fn truncate;
203 const char **label_path;
204 struct diff_words_data *diff_words;
a3c158d4 205 struct diff_options *opt;
6957eb9a 206 int *found_changesp;
3e97c7c6 207 struct strbuf *header;
6957eb9a
JH
208};
209
6973dcae
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210static int count_lines(const char *data, int size)
211{
212 int count, ch, completely_empty = 1, nl_just_seen = 0;
213 count = 0;
214 while (0 < size--) {
215 ch = *data++;
216 if (ch == '\n') {
217 count++;
218 nl_just_seen = 1;
219 completely_empty = 0;
220 }
221 else {
222 nl_just_seen = 0;
223 completely_empty = 0;
224 }
225 }
226 if (completely_empty)
227 return 0;
228 if (!nl_just_seen)
229 count++; /* no trailing newline */
230 return count;
231}
232
6957eb9a
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233static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
234{
235 if (!DIFF_FILE_VALID(one)) {
236 mf->ptr = (char *)""; /* does not matter */
237 mf->size = 0;
238 return 0;
239 }
240 else if (diff_populate_filespec(one, 0))
241 return -1;
bb35fefb 242
6957eb9a
JH
243 mf->ptr = one->data;
244 mf->size = one->size;
245 return 0;
246}
247
abb371a1
JK
248/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
249static unsigned long diff_filespec_size(struct diff_filespec *one)
250{
251 if (!DIFF_FILE_VALID(one))
252 return 0;
253 diff_populate_filespec(one, 1);
254 return one->size;
255}
256
6957eb9a
JH
257static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
258{
259 char *ptr = mf->ptr;
260 long size = mf->size;
261 int cnt = 0;
262
263 if (!size)
264 return cnt;
265 ptr += size - 1; /* pointing at the very end */
266 if (*ptr != '\n')
267 ; /* incomplete line */
268 else
269 ptr--; /* skip the last LF */
270 while (mf->ptr < ptr) {
271 char *prev_eol;
272 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
273 if (*prev_eol == '\n')
274 break;
275 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
276 break;
277 cnt++;
278 ptr = prev_eol - 1;
279 }
280 return cnt;
281}
282
283static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
284 struct emit_callback *ecbdata)
285{
286 int l1, l2, at;
287 unsigned ws_rule = ecbdata->ws_rule;
288 l1 = count_trailing_blank(mf1, ws_rule);
289 l2 = count_trailing_blank(mf2, ws_rule);
290 if (l2 <= l1) {
291 ecbdata->blank_at_eof_in_preimage = 0;
292 ecbdata->blank_at_eof_in_postimage = 0;
293 return;
294 }
295 at = count_lines(mf1->ptr, mf1->size);
296 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
297
298 at = count_lines(mf2->ptr, mf2->size);
299 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
300}
301
a3c158d4 302static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
250f7993 303 int first, const char *line, int len)
6957eb9a
JH
304{
305 int has_trailing_newline, has_trailing_carriage_return;
250f7993 306 int nofirst;
a3c158d4
BY
307 FILE *file = o->file;
308
309 if (o->output_prefix) {
310 struct strbuf *msg = NULL;
311 msg = o->output_prefix(o, o->output_prefix_data);
312 assert(msg);
313 fwrite(msg->buf, msg->len, 1, file);
314 }
6957eb9a 315
250f7993
JH
316 if (len == 0) {
317 has_trailing_newline = (first == '\n');
318 has_trailing_carriage_return = (!has_trailing_newline &&
319 (first == '\r'));
320 nofirst = has_trailing_newline || has_trailing_carriage_return;
321 } else {
322 has_trailing_newline = (len > 0 && line[len-1] == '\n');
323 if (has_trailing_newline)
324 len--;
325 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
326 if (has_trailing_carriage_return)
327 len--;
328 nofirst = 0;
329 }
6957eb9a 330
06a47552
JH
331 if (len || !nofirst) {
332 fputs(set, file);
333 if (!nofirst)
334 fputc(first, file);
335 fwrite(line, len, 1, file);
336 fputs(reset, file);
337 }
6957eb9a
JH
338 if (has_trailing_carriage_return)
339 fputc('\r', file);
340 if (has_trailing_newline)
341 fputc('\n', file);
342}
343
a3c158d4 344static void emit_line(struct diff_options *o, const char *set, const char *reset,
250f7993
JH
345 const char *line, int len)
346{
a3c158d4 347 emit_line_0(o, set, reset, line[0], line+1, len-1);
250f7993
JH
348}
349
6957eb9a
JH
350static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
351{
352 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
353 ecbdata->blank_at_eof_in_preimage &&
354 ecbdata->blank_at_eof_in_postimage &&
355 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
356 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
357 return 0;
018cff70 358 return ws_blank_line(line, len, ecbdata->ws_rule);
6957eb9a
JH
359}
360
018cff70
JH
361static void emit_add_line(const char *reset,
362 struct emit_callback *ecbdata,
363 const char *line, int len)
6957eb9a
JH
364{
365 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
366 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
367
368 if (!*ws)
a3c158d4 369 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
6957eb9a
JH
370 else if (new_blank_line_at_eof(ecbdata, line, len))
371 /* Blank line at EOF - paint '+' as well */
a3c158d4 372 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
6957eb9a
JH
373 else {
374 /* Emit just the prefix, then the rest. */
a3c158d4 375 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
018cff70 376 ws_check_emit(line, len, ecbdata->ws_rule,
a3c158d4 377 ecbdata->opt->file, set, reset, ws);
6957eb9a
JH
378 }
379}
380
89cb73a1
BW
381static void emit_hunk_header(struct emit_callback *ecbdata,
382 const char *line, int len)
383{
384 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
385 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
386 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
387 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
388 static const char atat[2] = { '@', '@' };
389 const char *cp, *ep;
2efcc977
BY
390 struct strbuf msgbuf = STRBUF_INIT;
391 int org_len = len;
392 int i = 1;
89cb73a1
BW
393
394 /*
395 * As a hunk header must begin with "@@ -<old>, +<new> @@",
396 * it always is at least 10 bytes long.
397 */
398 if (len < 10 ||
399 memcmp(line, atat, 2) ||
400 !(ep = memmem(line + 2, len - 2, atat, 2))) {
a3c158d4 401 emit_line(ecbdata->opt, plain, reset, line, len);
89cb73a1
BW
402 return;
403 }
404 ep += 2; /* skip over @@ */
405
406 /* The hunk header in fraginfo color */
2efcc977
BY
407 strbuf_add(&msgbuf, frag, strlen(frag));
408 strbuf_add(&msgbuf, line, ep - line);
409 strbuf_add(&msgbuf, reset, strlen(reset));
410
411 /*
412 * trailing "\r\n"
413 */
414 for ( ; i < 3; i++)
415 if (line[len - i] == '\r' || line[len - i] == '\n')
416 len--;
89cb73a1
BW
417
418 /* blank before the func header */
419 for (cp = ep; ep - line < len; ep++)
420 if (*ep != ' ' && *ep != '\t')
421 break;
2efcc977
BY
422 if (ep != cp) {
423 strbuf_add(&msgbuf, plain, strlen(plain));
424 strbuf_add(&msgbuf, cp, ep - cp);
425 strbuf_add(&msgbuf, reset, strlen(reset));
426 }
427
428 if (ep < line + len) {
429 strbuf_add(&msgbuf, func, strlen(func));
430 strbuf_add(&msgbuf, ep, line + len - ep);
431 strbuf_add(&msgbuf, reset, strlen(reset));
432 }
89cb73a1 433
2efcc977
BY
434 strbuf_add(&msgbuf, line + len, org_len - len);
435 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
436 strbuf_release(&msgbuf);
89cb73a1
BW
437}
438
479b0ae8
JK
439static struct diff_tempfile *claim_diff_tempfile(void) {
440 int i;
441 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
442 if (!diff_temp[i].name)
443 return diff_temp + i;
444 die("BUG: diff is failing to clean up its tempfiles");
445}
446
447static int remove_tempfile_installed;
448
449static void remove_tempfile(void)
450{
451 int i;
a8344abe
NR
452 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
453 if (diff_temp[i].name == diff_temp[i].tmp_path)
691f1a28 454 unlink_or_warn(diff_temp[i].name);
a8344abe
NR
455 diff_temp[i].name = NULL;
456 }
479b0ae8
JK
457}
458
459static void remove_tempfile_on_signal(int signo)
460{
461 remove_tempfile();
4a16d072 462 sigchain_pop(signo);
479b0ae8
JK
463 raise(signo);
464}
465
c0c77734 466static void print_line_count(FILE *file, int count)
6973dcae
JH
467{
468 switch (count) {
469 case 0:
c0c77734 470 fprintf(file, "0,0");
6973dcae
JH
471 break;
472 case 1:
c0c77734 473 fprintf(file, "1");
6973dcae
JH
474 break;
475 default:
c0c77734 476 fprintf(file, "1,%d", count);
6973dcae
JH
477 break;
478 }
479}
480
7f7ee2ff
JH
481static void emit_rewrite_lines(struct emit_callback *ecb,
482 int prefix, const char *data, int size)
6973dcae 483{
7f7ee2ff
JH
484 const char *endp = NULL;
485 static const char *nneof = " No newline at end of file\n";
486 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
487 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
488
489 while (0 < size) {
490 int len;
491
492 endp = memchr(data, '\n', size);
493 len = endp ? (endp - data + 1) : size;
494 if (prefix != '+') {
495 ecb->lno_in_preimage++;
a3c158d4 496 emit_line_0(ecb->opt, old, reset, '-',
7f7ee2ff
JH
497 data, len);
498 } else {
499 ecb->lno_in_postimage++;
500 emit_add_line(reset, ecb, data, len);
13e36ec5 501 }
7f7ee2ff
JH
502 size -= len;
503 data += len;
504 }
505 if (!endp) {
506 const char *plain = diff_get_color(ecb->color_diff,
507 DIFF_PLAIN);
a3c158d4 508 emit_line_0(ecb->opt, plain, reset, '\\',
7f7ee2ff 509 nneof, strlen(nneof));
6973dcae 510 }
6973dcae
JH
511}
512
513static void emit_rewrite_diff(const char *name_a,
514 const char *name_b,
515 struct diff_filespec *one,
13e36ec5 516 struct diff_filespec *two,
d9bae1a1
JK
517 struct userdiff_driver *textconv_one,
518 struct userdiff_driver *textconv_two,
eab9a40b 519 struct diff_options *o)
6973dcae
JH
520{
521 int lc_a, lc_b;
eab9a40b 522 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1a9eb3b9 523 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
524 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
525 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
13e36ec5 526 const char *reset = diff_get_color(color_diff, DIFF_RESET);
d5625091 527 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
a5a818ee 528 const char *a_prefix, *b_prefix;
840383b2 529 char *data_one, *data_two;
3aa1f7ca 530 size_t size_one, size_two;
7f7ee2ff 531 struct emit_callback ecbdata;
7be57610
BY
532 char *line_prefix = "";
533 struct strbuf *msgbuf;
534
535 if (o && o->output_prefix) {
536 msgbuf = o->output_prefix(o, o->output_prefix_data);
537 line_prefix = msgbuf->buf;
538 }
a5a818ee
JH
539
540 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
541 a_prefix = o->b_prefix;
542 b_prefix = o->a_prefix;
543 } else {
544 a_prefix = o->a_prefix;
545 b_prefix = o->b_prefix;
546 }
1a9eb3b9 547
8a13becc
JH
548 name_a += (*name_a == '/');
549 name_b += (*name_b == '/');
1a9eb3b9
JH
550 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
551 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
552
d5625091
JH
553 strbuf_reset(&a_name);
554 strbuf_reset(&b_name);
a5a818ee
JH
555 quote_two_c_style(&a_name, a_prefix, name_a, 0);
556 quote_two_c_style(&b_name, b_prefix, name_b, 0);
d5625091 557
840383b2
JK
558 size_one = fill_textconv(textconv_one, one, &data_one);
559 size_two = fill_textconv(textconv_two, two, &data_two);
3aa1f7ca 560
d91ba8fa
JH
561 memset(&ecbdata, 0, sizeof(ecbdata));
562 ecbdata.color_diff = color_diff;
563 ecbdata.found_changesp = &o->found_changes;
564 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
a3c158d4 565 ecbdata.opt = o;
d91ba8fa
JH
566 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
567 mmfile_t mf1, mf2;
568 mf1.ptr = (char *)data_one;
569 mf2.ptr = (char *)data_two;
570 mf1.size = size_one;
571 mf2.size = size_two;
572 check_blank_at_eof(&mf1, &mf2, &ecbdata);
573 }
574 ecbdata.lno_in_preimage = 1;
575 ecbdata.lno_in_postimage = 1;
576
3aa1f7ca
JK
577 lc_a = count_lines(data_one, size_one);
578 lc_b = count_lines(data_two, size_two);
c0c77734 579 fprintf(o->file,
7be57610
BY
580 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
581 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
582 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
583 line_prefix, fraginfo);
c0c77734
DB
584 print_line_count(o->file, lc_a);
585 fprintf(o->file, " +");
586 print_line_count(o->file, lc_b);
587 fprintf(o->file, " @@%s\n", reset);
6973dcae 588 if (lc_a)
d91ba8fa 589 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
6973dcae 590 if (lc_b)
d91ba8fa 591 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
b76c056b 592 if (textconv_one)
aed6ca52 593 free((char *)data_one);
b76c056b 594 if (textconv_two)
aed6ca52 595 free((char *)data_two);
6973dcae
JH
596}
597
f59a59e2
JS
598struct diff_words_buffer {
599 mmfile_t text;
600 long alloc;
2e5d2003
JS
601 struct diff_words_orig {
602 const char *begin, *end;
603 } *orig;
604 int orig_nr, orig_alloc;
f59a59e2
JS
605};
606
607static void diff_words_append(char *line, unsigned long len,
608 struct diff_words_buffer *buffer)
609{
23c1575f 610 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
f59a59e2
JS
611 line++;
612 len--;
613 memcpy(buffer->text.ptr + buffer->text.size, line, len);
614 buffer->text.size += len;
2b6a5417 615 buffer->text.ptr[buffer->text.size] = '\0';
f59a59e2
JS
616}
617
9cba13ca 618struct diff_words_style_elem {
882749a0
TR
619 const char *prefix;
620 const char *suffix;
621 const char *color; /* NULL; filled in by the setup code if
622 * color is enabled */
623};
624
9cba13ca 625struct diff_words_style {
882749a0
TR
626 enum diff_words_type type;
627 struct diff_words_style_elem new, old, ctx;
628 const char *newline;
629};
630
631struct diff_words_style diff_words_styles[] = {
632 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
633 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
634 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
635};
636
f59a59e2 637struct diff_words_data {
f59a59e2 638 struct diff_words_buffer minus, plus;
2e5d2003 639 const char *current_plus;
4297c0ae
BY
640 int last_minus;
641 struct diff_options *opt;
2b6a5417 642 regex_t *word_regex;
882749a0
TR
643 enum diff_words_type type;
644 struct diff_words_style *style;
f59a59e2
JS
645};
646
882749a0
TR
647static int fn_out_diff_words_write_helper(FILE *fp,
648 struct diff_words_style_elem *st_el,
649 const char *newline,
4297c0ae
BY
650 size_t count, const char *buf,
651 const char *line_prefix)
882749a0 652{
4297c0ae
BY
653 int print = 0;
654
882749a0
TR
655 while (count) {
656 char *p = memchr(buf, '\n', count);
4297c0ae
BY
657 if (print)
658 fputs(line_prefix, fp);
882749a0
TR
659 if (p != buf) {
660 if (st_el->color && fputs(st_el->color, fp) < 0)
661 return -1;
662 if (fputs(st_el->prefix, fp) < 0 ||
663 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
664 fputs(st_el->suffix, fp) < 0)
665 return -1;
666 if (st_el->color && *st_el->color
667 && fputs(GIT_COLOR_RESET, fp) < 0)
668 return -1;
669 }
670 if (!p)
671 return 0;
672 if (fputs(newline, fp) < 0)
673 return -1;
674 count -= p + 1 - buf;
675 buf = p + 1;
4297c0ae 676 print = 1;
882749a0
TR
677 }
678 return 0;
679}
680
4297c0ae
BY
681/*
682 * '--color-words' algorithm can be described as:
683 *
684 * 1. collect a the minus/plus lines of a diff hunk, divided into
685 * minus-lines and plus-lines;
686 *
687 * 2. break both minus-lines and plus-lines into words and
688 * place them into two mmfile_t with one word for each line;
689 *
690 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
691 *
692 * And for the common parts of the both file, we output the plus side text.
693 * diff_words->current_plus is used to trace the current position of the plus file
694 * which printed. diff_words->last_minus is used to trace the last minus word
695 * printed.
696 *
697 * For '--graph' to work with '--color-words', we need to output the graph prefix
698 * on each line of color words output. Generally, there are two conditions on
699 * which we should output the prefix.
700 *
701 * 1. diff_words->last_minus == 0 &&
702 * diff_words->current_plus == diff_words->plus.text.ptr
703 *
704 * that is: the plus text must start as a new line, and if there is no minus
705 * word printed, a graph prefix must be printed.
706 *
707 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
708 * *(diff_words->current_plus - 1) == '\n'
709 *
710 * that is: a graph prefix must be printed following a '\n'
711 */
712static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
713{
714 if ((diff_words->last_minus == 0 &&
715 diff_words->current_plus == diff_words->plus.text.ptr) ||
716 (diff_words->current_plus > diff_words->plus.text.ptr &&
717 *(diff_words->current_plus - 1) == '\n')) {
718 return 1;
719 } else {
720 return 0;
721 }
722}
723
f59a59e2 724static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
f59a59e2 725{
f59a59e2 726 struct diff_words_data *diff_words = priv;
882749a0 727 struct diff_words_style *style = diff_words->style;
2e5d2003
JS
728 int minus_first, minus_len, plus_first, plus_len;
729 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
4297c0ae
BY
730 struct diff_options *opt = diff_words->opt;
731 struct strbuf *msgbuf;
732 char *line_prefix = "";
f59a59e2 733
2e5d2003
JS
734 if (line[0] != '@' || parse_hunk_header(line, len,
735 &minus_first, &minus_len, &plus_first, &plus_len))
f59a59e2
JS
736 return;
737
4297c0ae
BY
738 assert(opt);
739 if (opt->output_prefix) {
740 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
741 line_prefix = msgbuf->buf;
742 }
743
2e5d2003
JS
744 /* POSIX requires that first be decremented by one if len == 0... */
745 if (minus_len) {
746 minus_begin = diff_words->minus.orig[minus_first].begin;
747 minus_end =
748 diff_words->minus.orig[minus_first + minus_len - 1].end;
749 } else
750 minus_begin = minus_end =
751 diff_words->minus.orig[minus_first].end;
752
753 if (plus_len) {
754 plus_begin = diff_words->plus.orig[plus_first].begin;
755 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
756 } else
757 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
758
4297c0ae
BY
759 if (color_words_output_graph_prefix(diff_words)) {
760 fputs(line_prefix, diff_words->opt->file);
761 }
762 if (diff_words->current_plus != plus_begin) {
763 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0
TR
764 &style->ctx, style->newline,
765 plus_begin - diff_words->current_plus,
4297c0ae
BY
766 diff_words->current_plus, line_prefix);
767 if (*(plus_begin - 1) == '\n')
768 fputs(line_prefix, diff_words->opt->file);
769 }
770 if (minus_begin != minus_end) {
771 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 772 &style->old, style->newline,
4297c0ae
BY
773 minus_end - minus_begin, minus_begin,
774 line_prefix);
775 }
776 if (plus_begin != plus_end) {
777 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 778 &style->new, style->newline,
4297c0ae
BY
779 plus_end - plus_begin, plus_begin,
780 line_prefix);
781 }
2e5d2003
JS
782
783 diff_words->current_plus = plus_end;
4297c0ae 784 diff_words->last_minus = minus_first;
f59a59e2
JS
785}
786
2b6a5417
JS
787/* This function starts looking at *begin, and returns 0 iff a word was found. */
788static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
789 int *begin, int *end)
790{
791 if (word_regex && *begin < buffer->size) {
792 regmatch_t match[1];
793 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
794 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
795 '\n', match[0].rm_eo - match[0].rm_so);
796 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
797 *begin += match[0].rm_so;
798 return *begin >= *end;
799 }
800 return -1;
f59a59e2
JS
801 }
802
2b6a5417
JS
803 /* find the next word */
804 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
805 (*begin)++;
806 if (*begin >= buffer->size)
807 return -1;
f59a59e2 808
2b6a5417
JS
809 /* find the end of the word */
810 *end = *begin + 1;
811 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
812 (*end)++;
813
814 return 0;
f59a59e2
JS
815}
816
23c1575f 817/*
2e5d2003
JS
818 * This function splits the words in buffer->text, stores the list with
819 * newline separator into out, and saves the offsets of the original words
820 * in buffer->orig.
23c1575f 821 */
2b6a5417
JS
822static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
823 regex_t *word_regex)
f59a59e2 824{
2e5d2003 825 int i, j;
2b6a5417 826 long alloc = 0;
f59a59e2 827
2e5d2003 828 out->size = 0;
2b6a5417 829 out->ptr = NULL;
f59a59e2 830
2e5d2003
JS
831 /* fake an empty "0th" word */
832 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
833 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
834 buffer->orig_nr = 1;
835
836 for (i = 0; i < buffer->text.size; i++) {
2b6a5417
JS
837 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
838 return;
2e5d2003
JS
839
840 /* store original boundaries */
841 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
842 buffer->orig_alloc);
843 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
844 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
845 buffer->orig_nr++;
846
847 /* store one word */
2b6a5417 848 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2e5d2003
JS
849 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
850 out->ptr[out->size + j - i] = '\n';
851 out->size += j - i + 1;
852
853 i = j - 1;
f59a59e2
JS
854 }
855}
856
857/* this executes the word diff on the accumulated buffers */
858static void diff_words_show(struct diff_words_data *diff_words)
859{
860 xpparam_t xpp;
861 xdemitconf_t xecfg;
f59a59e2 862 mmfile_t minus, plus;
882749a0 863 struct diff_words_style *style = diff_words->style;
f59a59e2 864
4297c0ae
BY
865 struct diff_options *opt = diff_words->opt;
866 struct strbuf *msgbuf;
867 char *line_prefix = "";
868
869 assert(opt);
870 if (opt->output_prefix) {
871 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
872 line_prefix = msgbuf->buf;
873 }
874
2e5d2003
JS
875 /* special case: only removal */
876 if (!diff_words->plus.text.size) {
4297c0ae
BY
877 fputs(line_prefix, diff_words->opt->file);
878 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 879 &style->old, style->newline,
4297c0ae
BY
880 diff_words->minus.text.size,
881 diff_words->minus.text.ptr, line_prefix);
2e5d2003
JS
882 diff_words->minus.text.size = 0;
883 return;
884 }
885
886 diff_words->current_plus = diff_words->plus.text.ptr;
4297c0ae 887 diff_words->last_minus = 0;
f59a59e2 888
9ccd0a88 889 memset(&xpp, 0, sizeof(xpp));
30b25010 890 memset(&xecfg, 0, sizeof(xecfg));
2b6a5417
JS
891 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
892 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
582aa00b 893 xpp.flags = 0;
2b6a5417 894 /* as only the hunk header will be parsed, we need a 0-context */
2e5d2003 895 xecfg.ctxlen = 0;
8a3f524b 896 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
dfea7900 897 &xpp, &xecfg);
f59a59e2
JS
898 free(minus.ptr);
899 free(plus.ptr);
2e5d2003 900 if (diff_words->current_plus != diff_words->plus.text.ptr +
4297c0ae
BY
901 diff_words->plus.text.size) {
902 if (color_words_output_graph_prefix(diff_words))
903 fputs(line_prefix, diff_words->opt->file);
904 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 905 &style->ctx, style->newline,
2e5d2003 906 diff_words->plus.text.ptr + diff_words->plus.text.size
4297c0ae
BY
907 - diff_words->current_plus, diff_words->current_plus,
908 line_prefix);
909 }
f59a59e2 910 diff_words->minus.text.size = diff_words->plus.text.size = 0;
f59a59e2
JS
911}
912
76fd2828
JH
913/* In "color-words" mode, show word-diff of words accumulated in the buffer */
914static void diff_words_flush(struct emit_callback *ecbdata)
915{
916 if (ecbdata->diff_words->minus.text.size ||
917 ecbdata->diff_words->plus.text.size)
918 diff_words_show(ecbdata->diff_words);
919}
920
f59a59e2
JS
921static void free_diff_words_data(struct emit_callback *ecbdata)
922{
923 if (ecbdata->diff_words) {
76fd2828 924 diff_words_flush(ecbdata);
8e0f7003 925 free (ecbdata->diff_words->minus.text.ptr);
2e5d2003 926 free (ecbdata->diff_words->minus.orig);
8e0f7003 927 free (ecbdata->diff_words->plus.text.ptr);
2e5d2003 928 free (ecbdata->diff_words->plus.orig);
ef5644ea
BC
929 if (ecbdata->diff_words->word_regex) {
930 regfree(ecbdata->diff_words->word_regex);
931 free(ecbdata->diff_words->word_regex);
932 }
f59a59e2
JS
933 free(ecbdata->diff_words);
934 ecbdata->diff_words = NULL;
935 }
936}
937
ce436973 938const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
939{
940 if (diff_use_color)
50f575fc
LT
941 return diff_colors[ix];
942 return "";
cd112cef
JS
943}
944
23707811
JH
945static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
946{
947 const char *cp;
948 unsigned long allot;
949 size_t l = len;
950
951 if (ecb->truncate)
952 return ecb->truncate(line, len);
953 cp = line;
954 allot = l;
955 while (0 < l) {
956 (void) utf8_width(&cp, &l);
957 if (!cp)
958 break; /* truncated in the middle? */
959 }
960 return allot - l;
961}
962
d68fe26f 963static void find_lno(const char *line, struct emit_callback *ecbdata)
690ed843 964{
d68fe26f
JH
965 const char *p;
966 ecbdata->lno_in_preimage = 0;
967 ecbdata->lno_in_postimage = 0;
968 p = strchr(line, '-');
690ed843 969 if (!p)
d68fe26f
JH
970 return; /* cannot happen */
971 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
972 p = strchr(p, '+');
973 if (!p)
974 return; /* cannot happen */
975 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
690ed843
JH
976}
977
cd112cef 978static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae 979{
6973dcae 980 struct emit_callback *ecbdata = priv;
472ca780
JK
981 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
982 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 983 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
7be57610
BY
984 struct diff_options *o = ecbdata->opt;
985 char *line_prefix = "";
986 struct strbuf *msgbuf;
987
988 if (o && o->output_prefix) {
989 msgbuf = o->output_prefix(o, o->output_prefix_data);
990 line_prefix = msgbuf->buf;
991 }
6973dcae 992
3e97c7c6 993 if (ecbdata->header) {
a3c158d4 994 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
3e97c7c6
GB
995 strbuf_reset(ecbdata->header);
996 ecbdata->header = NULL;
997 }
34a5e1a2
JS
998 *(ecbdata->found_changesp) = 1;
999
6973dcae 1000 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
1001 const char *name_a_tab, *name_b_tab;
1002
1003 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1004 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1005
7be57610
BY
1006 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1007 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1008 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1009 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
1010 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1011 }
cd112cef 1012
a624eaa7
JM
1013 if (diff_suppress_blank_empty
1014 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1015 line[0] = '\n';
1016 len = 1;
1017 }
1018
b8d9c1a6 1019 if (line[0] == '@') {
76fd2828
JH
1020 if (ecbdata->diff_words)
1021 diff_words_flush(ecbdata);
23707811 1022 len = sane_truncate_line(ecbdata, line, len);
d68fe26f 1023 find_lno(line, ecbdata);
89cb73a1 1024 emit_hunk_header(ecbdata, line, len);
23707811 1025 if (line[len-1] != '\n')
a3c158d4 1026 putc('\n', ecbdata->opt->file);
448c3ef1 1027 return;
cd112cef 1028 }
448c3ef1 1029
b8d9c1a6 1030 if (len < 1) {
a3c158d4 1031 emit_line(ecbdata->opt, reset, reset, line, len);
882749a0
TR
1032 if (ecbdata->diff_words
1033 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
a3c158d4 1034 fputs("~\n", ecbdata->opt->file);
448c3ef1 1035 return;
cd112cef 1036 }
448c3ef1 1037
448c3ef1
JH
1038 if (ecbdata->diff_words) {
1039 if (line[0] == '-') {
1040 diff_words_append(line, len,
1041 &ecbdata->diff_words->minus);
1042 return;
1043 } else if (line[0] == '+') {
1044 diff_words_append(line, len,
1045 &ecbdata->diff_words->plus);
1046 return;
1047 }
76fd2828 1048 diff_words_flush(ecbdata);
882749a0 1049 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
a3c158d4
BY
1050 emit_line(ecbdata->opt, plain, reset, line, len);
1051 fputs("~\n", ecbdata->opt->file);
882749a0
TR
1052 } else {
1053 /* don't print the prefix character */
a3c158d4 1054 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
882749a0 1055 }
448c3ef1
JH
1056 return;
1057 }
448c3ef1 1058
690ed843
JH
1059 if (line[0] != '+') {
1060 const char *color =
1061 diff_get_color(ecbdata->color_diff,
1062 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1063 ecbdata->lno_in_preimage++;
d68fe26f
JH
1064 if (line[0] == ' ')
1065 ecbdata->lno_in_postimage++;
a3c158d4 1066 emit_line(ecbdata->opt, color, reset, line, len);
d68fe26f
JH
1067 } else {
1068 ecbdata->lno_in_postimage++;
018cff70 1069 emit_add_line(reset, ecbdata, line + 1, len - 1);
448c3ef1 1070 }
6973dcae
JH
1071}
1072
1073static char *pprint_rename(const char *a, const char *b)
1074{
1075 const char *old = a;
1076 const char *new = b;
f285a2d7 1077 struct strbuf name = STRBUF_INIT;
6973dcae
JH
1078 int pfx_length, sfx_length;
1079 int len_a = strlen(a);
1080 int len_b = strlen(b);
663af342 1081 int a_midlen, b_midlen;
e5bfbf9b
AJ
1082 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1083 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1084
1085 if (qlen_a || qlen_b) {
663af342
PH
1086 quote_c_style(a, &name, NULL, 0);
1087 strbuf_addstr(&name, " => ");
1088 quote_c_style(b, &name, NULL, 0);
b315c5c0 1089 return strbuf_detach(&name, NULL);
e5bfbf9b 1090 }
6973dcae
JH
1091
1092 /* Find common prefix */
1093 pfx_length = 0;
1094 while (*old && *new && *old == *new) {
1095 if (*old == '/')
1096 pfx_length = old - a + 1;
1097 old++;
1098 new++;
1099 }
1100
1101 /* Find common suffix */
1102 old = a + len_a;
1103 new = b + len_b;
1104 sfx_length = 0;
1105 while (a <= old && b <= new && *old == *new) {
1106 if (*old == '/')
1107 sfx_length = len_a - (old - a);
1108 old--;
1109 new--;
1110 }
1111
1112 /*
1113 * pfx{mid-a => mid-b}sfx
1114 * {pfx-a => pfx-b}sfx
1115 * pfx{sfx-a => sfx-b}
1116 * name-a => name-b
1117 */
663af342
PH
1118 a_midlen = len_a - pfx_length - sfx_length;
1119 b_midlen = len_b - pfx_length - sfx_length;
1120 if (a_midlen < 0)
1121 a_midlen = 0;
1122 if (b_midlen < 0)
1123 b_midlen = 0;
1124
1125 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 1126 if (pfx_length + sfx_length) {
663af342
PH
1127 strbuf_add(&name, a, pfx_length);
1128 strbuf_addch(&name, '{');
6973dcae 1129 }
663af342
PH
1130 strbuf_add(&name, a + pfx_length, a_midlen);
1131 strbuf_addstr(&name, " => ");
1132 strbuf_add(&name, b + pfx_length, b_midlen);
1133 if (pfx_length + sfx_length) {
1134 strbuf_addch(&name, '}');
1135 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 1136 }
b315c5c0 1137 return strbuf_detach(&name, NULL);
6973dcae
JH
1138}
1139
1140struct diffstat_t {
6973dcae
JH
1141 int nr;
1142 int alloc;
1143 struct diffstat_file {
f604652e 1144 char *from_name;
6973dcae 1145 char *name;
f604652e 1146 char *print_name;
6973dcae
JH
1147 unsigned is_unmerged:1;
1148 unsigned is_binary:1;
1149 unsigned is_renamed:1;
0974c117 1150 uintmax_t added, deleted;
6973dcae
JH
1151 } **files;
1152};
1153
1154static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1155 const char *name_a,
1156 const char *name_b)
1157{
1158 struct diffstat_file *x;
1159 x = xcalloc(sizeof (*x), 1);
1160 if (diffstat->nr == diffstat->alloc) {
1161 diffstat->alloc = alloc_nr(diffstat->alloc);
1162 diffstat->files = xrealloc(diffstat->files,
1163 diffstat->alloc * sizeof(x));
1164 }
1165 diffstat->files[diffstat->nr++] = x;
1166 if (name_b) {
f604652e
JH
1167 x->from_name = xstrdup(name_a);
1168 x->name = xstrdup(name_b);
6973dcae
JH
1169 x->is_renamed = 1;
1170 }
f604652e
JH
1171 else {
1172 x->from_name = NULL;
9befac47 1173 x->name = xstrdup(name_a);
f604652e 1174 }
6973dcae
JH
1175 return x;
1176}
1177
1178static void diffstat_consume(void *priv, char *line, unsigned long len)
1179{
1180 struct diffstat_t *diffstat = priv;
1181 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1182
1183 if (line[0] == '+')
1184 x->added++;
1185 else if (line[0] == '-')
1186 x->deleted++;
1187}
1188
698ce6f8 1189const char mime_boundary_leader[] = "------------";
6973dcae 1190
a2540023
JH
1191static int scale_linear(int it, int width, int max_change)
1192{
1193 /*
3ed74e60
JS
1194 * make sure that at least one '-' is printed if there were deletions,
1195 * and likewise for '+'.
a2540023 1196 */
3ed74e60
JS
1197 if (max_change < 2)
1198 return it;
1199 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
1200}
1201
c0c77734 1202static void show_name(FILE *file,
a408e0e6 1203 const char *prefix, const char *name, int len)
a2540023 1204{
a408e0e6 1205 fprintf(file, " %s%-*s |", prefix, len, name);
a2540023
JH
1206}
1207
c0c77734 1208static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
1209{
1210 if (cnt <= 0)
1211 return;
c0c77734 1212 fprintf(file, "%s", set);
a2540023 1213 while (cnt--)
c0c77734
DB
1214 putc(ch, file);
1215 fprintf(file, "%s", reset);
a2540023
JH
1216}
1217
f604652e
JH
1218static void fill_print_name(struct diffstat_file *file)
1219{
1220 char *pname;
1221
1222 if (file->print_name)
1223 return;
1224
1225 if (!file->is_renamed) {
f285a2d7 1226 struct strbuf buf = STRBUF_INIT;
f604652e
JH
1227 if (quote_c_style(file->name, &buf, NULL, 0)) {
1228 pname = strbuf_detach(&buf, NULL);
1229 } else {
1230 pname = file->name;
1231 strbuf_release(&buf);
1232 }
1233 } else {
1234 pname = pprint_rename(file->from_name, file->name);
1235 }
1236 file->print_name = pname;
1237}
1238
4b25d091 1239static void show_stats(struct diffstat_t *data, struct diff_options *options)
6973dcae 1240{
eb3a9dd3 1241 int i, len, add, del, adds = 0, dels = 0;
0974c117 1242 uintmax_t max_change = 0, max_len = 0;
6973dcae 1243 int total_files = data->nr;
a2540023 1244 int width, name_width;
785f7432 1245 const char *reset, *set, *add_c, *del_c;
7be57610
BY
1246 const char *line_prefix = "";
1247 struct strbuf *msg = NULL;
6973dcae
JH
1248
1249 if (data->nr == 0)
1250 return;
1251
7be57610
BY
1252 if (options->output_prefix) {
1253 msg = options->output_prefix(options, options->output_prefix_data);
1254 line_prefix = msg->buf;
1255 }
1256
a2540023
JH
1257 width = options->stat_width ? options->stat_width : 80;
1258 name_width = options->stat_name_width ? options->stat_name_width : 50;
1259
1260 /* Sanity: give at least 5 columns to the graph,
1261 * but leave at least 10 columns for the name.
1262 */
861d1af3
OM
1263 if (width < 25)
1264 width = 25;
1265 if (name_width < 10)
1266 name_width = 10;
1267 else if (width < name_width + 15)
1268 name_width = width - 15;
a2540023
JH
1269
1270 /* Find the longest filename and max number of changes */
8f67f8ae
PH
1271 reset = diff_get_color_opt(options, DIFF_RESET);
1272 set = diff_get_color_opt(options, DIFF_PLAIN);
1273 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1274 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 1275
6973dcae
JH
1276 for (i = 0; i < data->nr; i++) {
1277 struct diffstat_file *file = data->files[i];
0974c117 1278 uintmax_t change = file->added + file->deleted;
f604652e
JH
1279 fill_print_name(file);
1280 len = strlen(file->print_name);
6973dcae
JH
1281 if (max_len < len)
1282 max_len = len;
1283
1284 if (file->is_binary || file->is_unmerged)
1285 continue;
a2540023
JH
1286 if (max_change < change)
1287 max_change = change;
6973dcae
JH
1288 }
1289
a2540023
JH
1290 /* Compute the width of the graph part;
1291 * 10 is for one blank at the beginning of the line plus
1292 * " | count " between the name and the graph.
1293 *
1294 * From here on, name_width is the width of the name area,
1295 * and width is the width of the graph area.
1296 */
1297 name_width = (name_width < max_len) ? name_width : max_len;
1298 if (width < (name_width + 10) + max_change)
1299 width = width - (name_width + 10);
1300 else
1301 width = max_change;
1302
6973dcae 1303 for (i = 0; i < data->nr; i++) {
d2543b8e 1304 const char *prefix = "";
f604652e 1305 char *name = data->files[i]->print_name;
0974c117
JK
1306 uintmax_t added = data->files[i]->added;
1307 uintmax_t deleted = data->files[i]->deleted;
a2540023 1308 int name_len;
6973dcae
JH
1309
1310 /*
1311 * "scale" the filename
1312 */
a2540023
JH
1313 len = name_width;
1314 name_len = strlen(name);
1315 if (name_width < name_len) {
6973dcae
JH
1316 char *slash;
1317 prefix = "...";
a2540023
JH
1318 len -= 3;
1319 name += name_len - len;
6973dcae
JH
1320 slash = strchr(name, '/');
1321 if (slash)
1322 name = slash;
1323 }
6973dcae
JH
1324
1325 if (data->files[i]->is_binary) {
7be57610 1326 fprintf(options->file, "%s", line_prefix);
a408e0e6 1327 show_name(options->file, prefix, name, len);
c0c77734 1328 fprintf(options->file, " Bin ");
0974c117
JK
1329 fprintf(options->file, "%s%"PRIuMAX"%s",
1330 del_c, deleted, reset);
c0c77734 1331 fprintf(options->file, " -> ");
0974c117
JK
1332 fprintf(options->file, "%s%"PRIuMAX"%s",
1333 add_c, added, reset);
c0c77734
DB
1334 fprintf(options->file, " bytes");
1335 fprintf(options->file, "\n");
f604652e 1336 continue;
6973dcae
JH
1337 }
1338 else if (data->files[i]->is_unmerged) {
7be57610 1339 fprintf(options->file, "%s", line_prefix);
a408e0e6 1340 show_name(options->file, prefix, name, len);
c0c77734 1341 fprintf(options->file, " Unmerged\n");
f604652e 1342 continue;
6973dcae
JH
1343 }
1344 else if (!data->files[i]->is_renamed &&
1345 (added + deleted == 0)) {
1346 total_files--;
f604652e 1347 continue;
6973dcae
JH
1348 }
1349
a2540023
JH
1350 /*
1351 * scale the add/delete
1352 */
6973dcae
JH
1353 add = added;
1354 del = deleted;
6973dcae
JH
1355 adds += add;
1356 dels += del;
1357
a2540023 1358 if (width <= max_change) {
a2540023 1359 add = scale_linear(add, width, max_change);
3ed74e60 1360 del = scale_linear(del, width, max_change);
6973dcae 1361 }
7be57610 1362 fprintf(options->file, "%s", line_prefix);
a408e0e6 1363 show_name(options->file, prefix, name, len);
0974c117 1364 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
4d9b5359 1365 added + deleted ? " " : "");
c0c77734
DB
1366 show_graph(options->file, '+', add, add_c, reset);
1367 show_graph(options->file, '-', del, del_c, reset);
1368 fprintf(options->file, "\n");
1369 }
7be57610 1370 fprintf(options->file, "%s", line_prefix);
c0c77734 1371 fprintf(options->file,
a408e0e6
MH
1372 " %d files changed, %d insertions(+), %d deletions(-)\n",
1373 total_files, adds, dels);
6973dcae
JH
1374}
1375
2775d92c 1376static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
ebd124c6
NP
1377{
1378 int i, adds = 0, dels = 0, total_files = data->nr;
1379
1380 if (data->nr == 0)
1381 return;
1382
1383 for (i = 0; i < data->nr; i++) {
1384 if (!data->files[i]->is_binary &&
1385 !data->files[i]->is_unmerged) {
1386 int added = data->files[i]->added;
1387 int deleted= data->files[i]->deleted;
1388 if (!data->files[i]->is_renamed &&
1389 (added + deleted == 0)) {
1390 total_files--;
1391 } else {
1392 adds += added;
1393 dels += deleted;
1394 }
1395 }
ebd124c6 1396 }
7be57610
BY
1397 if (options->output_prefix) {
1398 struct strbuf *msg = NULL;
1399 msg = options->output_prefix(options,
1400 options->output_prefix_data);
1401 fprintf(options->file, "%s", msg->buf);
1402 }
c0c77734 1403 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
ebd124c6
NP
1404 total_files, adds, dels);
1405}
1406
4b25d091 1407static void show_numstat(struct diffstat_t *data, struct diff_options *options)
74e2abe5
JH
1408{
1409 int i;
1410
f604652e
JH
1411 if (data->nr == 0)
1412 return;
1413
74e2abe5
JH
1414 for (i = 0; i < data->nr; i++) {
1415 struct diffstat_file *file = data->files[i];
1416
7be57610
BY
1417 if (options->output_prefix) {
1418 struct strbuf *msg = NULL;
1419 msg = options->output_prefix(options,
1420 options->output_prefix_data);
1421 fprintf(options->file, "%s", msg->buf);
1422 }
1423
bfddbc5e 1424 if (file->is_binary)
c0c77734 1425 fprintf(options->file, "-\t-\t");
bfddbc5e 1426 else
c0c77734 1427 fprintf(options->file,
0974c117
JK
1428 "%"PRIuMAX"\t%"PRIuMAX"\t",
1429 file->added, file->deleted);
f604652e
JH
1430 if (options->line_termination) {
1431 fill_print_name(file);
1432 if (!file->is_renamed)
c0c77734 1433 write_name_quoted(file->name, options->file,
f604652e
JH
1434 options->line_termination);
1435 else {
c0c77734
DB
1436 fputs(file->print_name, options->file);
1437 putc(options->line_termination, options->file);
f604652e 1438 }
663af342 1439 } else {
f604652e 1440 if (file->is_renamed) {
c0c77734
DB
1441 putc('\0', options->file);
1442 write_name_quoted(file->from_name, options->file, '\0');
f604652e 1443 }
c0c77734 1444 write_name_quoted(file->name, options->file, '\0');
663af342 1445 }
74e2abe5
JH
1446 }
1447}
1448
c04a7155
JH
1449struct dirstat_file {
1450 const char *name;
1451 unsigned long changed;
7df7c019
LT
1452};
1453
c04a7155
JH
1454struct dirstat_dir {
1455 struct dirstat_file *files;
1456 int alloc, nr, percent, cumulative;
1457};
1458
7be57610
BY
1459static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1460 unsigned long changed, const char *base, int baselen)
7df7c019
LT
1461{
1462 unsigned long this_dir = 0;
1463 unsigned int sources = 0;
7be57610
BY
1464 const char *line_prefix = "";
1465 struct strbuf *msg = NULL;
1466
1467 if (opt->output_prefix) {
1468 msg = opt->output_prefix(opt, opt->output_prefix_data);
1469 line_prefix = msg->buf;
1470 }
7df7c019
LT
1471
1472 while (dir->nr) {
c04a7155 1473 struct dirstat_file *f = dir->files;
7df7c019
LT
1474 int namelen = strlen(f->name);
1475 unsigned long this;
1476 char *slash;
1477
1478 if (namelen < baselen)
1479 break;
1480 if (memcmp(f->name, base, baselen))
1481 break;
1482 slash = strchr(f->name + baselen, '/');
1483 if (slash) {
1484 int newbaselen = slash + 1 - f->name;
7be57610 1485 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
7df7c019
LT
1486 sources++;
1487 } else {
c04a7155 1488 this = f->changed;
7df7c019
LT
1489 dir->files++;
1490 dir->nr--;
1491 sources += 2;
1492 }
1493 this_dir += this;
1494 }
1495
1496 /*
1497 * We don't report dirstat's for
1498 * - the top level
1499 * - or cases where everything came from a single directory
1500 * under this directory (sources == 1).
1501 */
1502 if (baselen && sources != 1) {
1503 int permille = this_dir * 1000 / changed;
1504 if (permille) {
1505 int percent = permille / 10;
1506 if (percent >= dir->percent) {
7be57610
BY
1507 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1508 percent, permille % 10, baselen, base);
7df7c019
LT
1509 if (!dir->cumulative)
1510 return 0;
1511 }
1512 }
1513 }
1514 return this_dir;
1515}
1516
441bca0b
LT
1517static int dirstat_compare(const void *_a, const void *_b)
1518{
1519 const struct dirstat_file *a = _a;
1520 const struct dirstat_file *b = _b;
1521 return strcmp(a->name, b->name);
1522}
1523
c04a7155 1524static void show_dirstat(struct diff_options *options)
7df7c019
LT
1525{
1526 int i;
1527 unsigned long changed;
c04a7155
JH
1528 struct dirstat_dir dir;
1529 struct diff_queue_struct *q = &diff_queued_diff;
1530
1531 dir.files = NULL;
1532 dir.alloc = 0;
1533 dir.nr = 0;
1534 dir.percent = options->dirstat_percent;
f88d225f 1535 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
7df7c019 1536
7df7c019 1537 changed = 0;
c04a7155
JH
1538 for (i = 0; i < q->nr; i++) {
1539 struct diff_filepair *p = q->queue[i];
1540 const char *name;
1541 unsigned long copied, added, damage;
1542
1543 name = p->one->path ? p->one->path : p->two->path;
1544
1545 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1546 diff_populate_filespec(p->one, 0);
1547 diff_populate_filespec(p->two, 0);
1548 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1549 &copied, &added);
1550 diff_free_filespec_data(p->one);
1551 diff_free_filespec_data(p->two);
1552 } else if (DIFF_FILE_VALID(p->one)) {
1553 diff_populate_filespec(p->one, 1);
1554 copied = added = 0;
1555 diff_free_filespec_data(p->one);
1556 } else if (DIFF_FILE_VALID(p->two)) {
1557 diff_populate_filespec(p->two, 1);
1558 copied = 0;
1559 added = p->two->size;
1560 diff_free_filespec_data(p->two);
1561 } else
2b0b551d 1562 continue;
c04a7155
JH
1563
1564 /*
1565 * Original minus copied is the removed material,
1566 * added is the new material. They are both damages
fd33777b
HO
1567 * made to the preimage. In --dirstat-by-file mode, count
1568 * damaged files, not damaged lines. This is done by
1569 * counting only a single damaged line per file.
c04a7155
JH
1570 */
1571 damage = (p->one->size - copied) + added;
fd33777b
HO
1572 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1573 damage = 1;
c04a7155
JH
1574
1575 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1576 dir.files[dir.nr].name = name;
1577 dir.files[dir.nr].changed = damage;
1578 changed += damage;
1579 dir.nr++;
7df7c019
LT
1580 }
1581
1582 /* This can happen even with many files, if everything was renames */
1583 if (!changed)
1584 return;
1585
1586 /* Show all directories with more than x% of the changes */
441bca0b 1587 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
7be57610 1588 gather_dirstat(options, &dir, changed, "", 0);
7df7c019
LT
1589}
1590
f604652e
JH
1591static void free_diffstat_info(struct diffstat_t *diffstat)
1592{
1593 int i;
1594 for (i = 0; i < diffstat->nr; i++) {
1595 struct diffstat_file *f = diffstat->files[i];
1596 if (f->name != f->print_name)
1597 free(f->print_name);
1598 free(f->name);
1599 free(f->from_name);
1600 free(f);
1601 }
1602 free(diffstat->files);
1603}
1604
88246898 1605struct checkdiff_t {
88246898 1606 const char *filename;
1ba111d1 1607 int lineno;
a757c646 1608 int conflict_marker_size;
1ba111d1 1609 struct diff_options *o;
cf1b7869 1610 unsigned ws_rule;
62c64895 1611 unsigned status;
88246898
JS
1612};
1613
a757c646 1614static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
04954043
JH
1615{
1616 char firstchar;
1617 int cnt;
1618
a757c646 1619 if (len < marker_size + 1)
04954043
JH
1620 return 0;
1621 firstchar = line[0];
1622 switch (firstchar) {
a757c646 1623 case '=': case '>': case '<': case '|':
04954043
JH
1624 break;
1625 default:
1626 return 0;
1627 }
a757c646 1628 for (cnt = 1; cnt < marker_size; cnt++)
04954043
JH
1629 if (line[cnt] != firstchar)
1630 return 0;
a757c646
JH
1631 /* line[1] thru line[marker_size-1] are same as firstchar */
1632 if (len < marker_size + 1 || !isspace(line[marker_size]))
04954043 1633 return 0;
04954043
JH
1634 return 1;
1635}
1636
88246898
JS
1637static void checkdiff_consume(void *priv, char *line, unsigned long len)
1638{
1639 struct checkdiff_t *data = priv;
1ba111d1 1640 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
a757c646 1641 int marker_size = data->conflict_marker_size;
1ba111d1
JH
1642 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1643 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1644 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
c1795bb0 1645 char *err;
7be57610
BY
1646 char *line_prefix = "";
1647 struct strbuf *msgbuf;
1648
1649 assert(data->o);
1650 if (data->o->output_prefix) {
1651 msgbuf = data->o->output_prefix(data->o,
1652 data->o->output_prefix_data);
1653 line_prefix = msgbuf->buf;
1654 }
88246898
JS
1655
1656 if (line[0] == '+') {
18374e58 1657 unsigned bad;
0ef617f4 1658 data->lineno++;
a757c646 1659 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
04954043
JH
1660 data->status |= 1;
1661 fprintf(data->o->file,
7be57610
BY
1662 "%s%s:%d: leftover conflict marker\n",
1663 line_prefix, data->filename, data->lineno);
04954043 1664 }
8f8841e9 1665 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 1666 if (!bad)
c1795bb0 1667 return;
18374e58
JH
1668 data->status |= bad;
1669 err = whitespace_error_string(bad);
7be57610
BY
1670 fprintf(data->o->file, "%s%s:%d: %s.\n",
1671 line_prefix, data->filename, data->lineno, err);
c1795bb0 1672 free(err);
a3c158d4 1673 emit_line(data->o, set, reset, line, 1);
8f8841e9 1674 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 1675 data->o->file, set, reset, ws);
877f23cc 1676 } else if (line[0] == ' ') {
88246898 1677 data->lineno++;
877f23cc 1678 } else if (line[0] == '@') {
88246898
JS
1679 char *plus = strchr(line, '+');
1680 if (plus)
0ef617f4 1681 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
1682 else
1683 die("invalid diff");
1684 }
1685}
1686
0660626c
JH
1687static unsigned char *deflate_it(char *data,
1688 unsigned long size,
1689 unsigned long *result_size)
051308f6 1690{
0660626c
JH
1691 int bound;
1692 unsigned char *deflated;
1693 z_stream stream;
1694
1695 memset(&stream, 0, sizeof(stream));
12f6c308 1696 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1697 bound = deflateBound(&stream, size);
1698 deflated = xmalloc(bound);
1699 stream.next_out = deflated;
1700 stream.avail_out = bound;
1701
1702 stream.next_in = (unsigned char *)data;
1703 stream.avail_in = size;
1704 while (deflate(&stream, Z_FINISH) == Z_OK)
1705 ; /* nothing */
1706 deflateEnd(&stream);
1707 *result_size = stream.total_out;
1708 return deflated;
051308f6
JH
1709}
1710
7be57610 1711static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
051308f6 1712{
0660626c
JH
1713 void *cp;
1714 void *delta;
1715 void *deflated;
1716 void *data;
1717 unsigned long orig_size;
1718 unsigned long delta_size;
1719 unsigned long deflate_size;
1720 unsigned long data_size;
051308f6 1721
0660626c
JH
1722 /* We could do deflated delta, or we could do just deflated two,
1723 * whichever is smaller.
051308f6 1724 */
0660626c
JH
1725 delta = NULL;
1726 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1727 if (one->size && two->size) {
1728 delta = diff_delta(one->ptr, one->size,
1729 two->ptr, two->size,
1730 &delta_size, deflate_size);
1731 if (delta) {
1732 void *to_free = delta;
1733 orig_size = delta_size;
1734 delta = deflate_it(delta, delta_size, &delta_size);
1735 free(to_free);
051308f6
JH
1736 }
1737 }
051308f6 1738
0660626c 1739 if (delta && delta_size < deflate_size) {
7be57610 1740 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
0660626c
JH
1741 free(deflated);
1742 data = delta;
1743 data_size = delta_size;
1744 }
1745 else {
7be57610 1746 fprintf(file, "%sliteral %lu\n", prefix, two->size);
0660626c
JH
1747 free(delta);
1748 data = deflated;
1749 data_size = deflate_size;
1750 }
051308f6 1751
0660626c
JH
1752 /* emit data encoded in base85 */
1753 cp = data;
1754 while (data_size) {
1755 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1756 char line[70];
0660626c 1757 data_size -= bytes;
051308f6
JH
1758 if (bytes <= 26)
1759 line[0] = bytes + 'A' - 1;
1760 else
1761 line[0] = bytes - 26 + 'a' - 1;
1762 encode_85(line + 1, cp, bytes);
1d7f171c 1763 cp = (char *) cp + bytes;
7be57610 1764 fprintf(file, "%s", prefix);
c0c77734
DB
1765 fputs(line, file);
1766 fputc('\n', file);
051308f6 1767 }
7be57610 1768 fprintf(file, "%s\n", prefix);
0660626c 1769 free(data);
051308f6
JH
1770}
1771
7be57610 1772static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
d4c452f0 1773{
7be57610
BY
1774 fprintf(file, "%sGIT binary patch\n", prefix);
1775 emit_binary_diff_body(file, one, two, prefix);
1776 emit_binary_diff_body(file, two, one, prefix);
d4c452f0
JH
1777}
1778
72cf4841 1779static void diff_filespec_load_driver(struct diff_filespec *one)
6973dcae 1780{
d391c0ff
JK
1781 /* Use already-loaded driver */
1782 if (one->driver)
1783 return;
1784
1785 if (S_ISREG(one->mode))
122aa6f9 1786 one->driver = userdiff_find_by_path(one->path);
d391c0ff
JK
1787
1788 /* Fallback to default settings */
122aa6f9
JK
1789 if (!one->driver)
1790 one->driver = userdiff_find_by_name("default");
29a3eefd
JH
1791}
1792
1793int diff_filespec_is_binary(struct diff_filespec *one)
1794{
122aa6f9
JK
1795 if (one->is_binary == -1) {
1796 diff_filespec_load_driver(one);
1797 if (one->driver->binary != -1)
1798 one->is_binary = one->driver->binary;
1799 else {
1800 if (!one->data && DIFF_FILE_VALID(one))
1801 diff_populate_filespec(one, 0);
1802 if (one->data)
1803 one->is_binary = buffer_is_binary(one->data,
1804 one->size);
1805 if (one->is_binary == -1)
1806 one->is_binary = 0;
1807 }
1808 }
29a3eefd 1809 return one->is_binary;
6973dcae
JH
1810}
1811
be58e70d 1812static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1813{
122aa6f9
JK
1814 diff_filespec_load_driver(one);
1815 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
f258475a
JH
1816}
1817
80c49c3d
TR
1818static const char *userdiff_word_regex(struct diff_filespec *one)
1819{
1820 diff_filespec_load_driver(one);
1821 return one->driver->word_regex;
1822}
1823
a5a818ee
JH
1824void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1825{
1826 if (!options->a_prefix)
1827 options->a_prefix = a;
1828 if (!options->b_prefix)
1829 options->b_prefix = b;
1830}
1831
a788d7d5 1832struct userdiff_driver *get_textconv(struct diff_filespec *one)
04427ac8
JK
1833{
1834 if (!DIFF_FILE_VALID(one))
1835 return NULL;
d391c0ff 1836
04427ac8 1837 diff_filespec_load_driver(one);
d9bae1a1
JK
1838 if (!one->driver->textconv)
1839 return NULL;
1840
1841 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1842 struct notes_cache *c = xmalloc(sizeof(*c));
1843 struct strbuf name = STRBUF_INIT;
1844
1845 strbuf_addf(&name, "textconv/%s", one->driver->name);
1846 notes_cache_init(c, name.buf, one->driver->textconv);
1847 one->driver->textconv_cache = c;
1848 }
1849
1850 return one->driver;
04427ac8
JK
1851}
1852
6973dcae
JH
1853static void builtin_diff(const char *name_a,
1854 const char *name_b,
1855 struct diff_filespec *one,
1856 struct diff_filespec *two,
1857 const char *xfrm_msg,
296c6bb2 1858 int must_show_header,
051308f6 1859 struct diff_options *o,
6973dcae
JH
1860 int complete_rewrite)
1861{
1862 mmfile_t mf1, mf2;
1863 const char *lbl[2];
1864 char *a_one, *b_two;
8f67f8ae
PH
1865 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1866 const char *reset = diff_get_color_opt(o, DIFF_RESET);
a5a818ee 1867 const char *a_prefix, *b_prefix;
d9bae1a1
JK
1868 struct userdiff_driver *textconv_one = NULL;
1869 struct userdiff_driver *textconv_two = NULL;
3e97c7c6 1870 struct strbuf header = STRBUF_INIT;
7be57610
BY
1871 struct strbuf *msgbuf;
1872 char *line_prefix = "";
1873
1874 if (o->output_prefix) {
1875 msgbuf = o->output_prefix(o, o->output_prefix_data);
1876 line_prefix = msgbuf->buf;
1877 }
a5a818ee 1878
752c0c24
JS
1879 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1880 (!one->mode || S_ISGITLINK(one->mode)) &&
1881 (!two->mode || S_ISGITLINK(two->mode))) {
1882 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1883 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1884 show_submodule_summary(o->file, one ? one->path : two->path,
721ceec1 1885 one->sha1, two->sha1, two->dirty_submodule,
752c0c24
JS
1886 del, add, reset);
1887 return;
1888 }
1889
3aa1f7ca
JK
1890 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1891 textconv_one = get_textconv(one);
1892 textconv_two = get_textconv(two);
1893 }
1894
a5a818ee
JH
1895 diff_set_mnemonic_prefix(o, "a/", "b/");
1896 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1897 a_prefix = o->b_prefix;
1898 b_prefix = o->a_prefix;
1899 } else {
1900 a_prefix = o->a_prefix;
1901 b_prefix = o->b_prefix;
1902 }
6973dcae 1903
71b989e7
LT
1904 /* Never use a non-valid filename anywhere if at all possible */
1905 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1906 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1907
a5a818ee
JH
1908 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1909 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
1910 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1911 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
7be57610 1912 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
6973dcae
JH
1913 if (lbl[0][0] == '/') {
1914 /* /dev/null */
7be57610 1915 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
37466447
BW
1916 if (xfrm_msg)
1917 strbuf_addstr(&header, xfrm_msg);
296c6bb2 1918 must_show_header = 1;
6973dcae
JH
1919 }
1920 else if (lbl[1][0] == '/') {
7be57610 1921 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
37466447
BW
1922 if (xfrm_msg)
1923 strbuf_addstr(&header, xfrm_msg);
296c6bb2 1924 must_show_header = 1;
6973dcae
JH
1925 }
1926 else {
1927 if (one->mode != two->mode) {
7be57610
BY
1928 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1929 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
296c6bb2 1930 must_show_header = 1;
cd112cef 1931 }
37466447
BW
1932 if (xfrm_msg)
1933 strbuf_addstr(&header, xfrm_msg);
3e97c7c6 1934
6973dcae
JH
1935 /*
1936 * we do not run diff between different kind
1937 * of objects.
1938 */
1939 if ((one->mode ^ two->mode) & S_IFMT)
1940 goto free_ab_and_return;
0c01857d 1941 if (complete_rewrite &&
3aa1f7ca
JK
1942 (textconv_one || !diff_filespec_is_binary(one)) &&
1943 (textconv_two || !diff_filespec_is_binary(two))) {
3e97c7c6
GB
1944 fprintf(o->file, "%s", header.buf);
1945 strbuf_reset(&header);
3aa1f7ca
JK
1946 emit_rewrite_diff(name_a, name_b, one, two,
1947 textconv_one, textconv_two, o);
34a5e1a2 1948 o->found_changes = 1;
6973dcae
JH
1949 goto free_ab_and_return;
1950 }
1951 }
1952
8f67f8ae 1953 if (!DIFF_OPT_TST(o, TEXT) &&
b3373982
JK
1954 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1955 (!textconv_two && diff_filespec_is_binary(two)) )) {
1956 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1957 die("unable to read files to diff");
0660626c
JH
1958 /* Quite common confusing case */
1959 if (mf1.size == mf2.size &&
296c6bb2
CC
1960 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1961 if (must_show_header)
1962 fprintf(o->file, "%s", header.buf);
0660626c 1963 goto free_ab_and_return;
296c6bb2 1964 }
3e97c7c6
GB
1965 fprintf(o->file, "%s", header.buf);
1966 strbuf_reset(&header);
8f67f8ae 1967 if (DIFF_OPT_TST(o, BINARY))
7be57610 1968 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
051308f6 1969 else
7be57610
BY
1970 fprintf(o->file, "%sBinary files %s and %s differ\n",
1971 line_prefix, lbl[0], lbl[1]);
34a5e1a2 1972 o->found_changes = 1;
051308f6 1973 }
6973dcae
JH
1974 else {
1975 /* Crazy xdl interfaces.. */
1976 const char *diffopts = getenv("GIT_DIFF_OPTS");
1977 xpparam_t xpp;
1978 xdemitconf_t xecfg;
6973dcae 1979 struct emit_callback ecbdata;
be58e70d 1980 const struct userdiff_funcname *pe;
f258475a 1981
296c6bb2 1982 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
3e97c7c6
GB
1983 fprintf(o->file, "%s", header.buf);
1984 strbuf_reset(&header);
1985 }
1986
840383b2
JK
1987 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1988 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
04427ac8 1989
45e7ca0f
BC
1990 pe = diff_funcname_pattern(one);
1991 if (!pe)
1992 pe = diff_funcname_pattern(two);
6973dcae 1993
9ccd0a88 1994 memset(&xpp, 0, sizeof(xpp));
30b25010 1995 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1996 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1997 ecbdata.label_path = lbl;
8f67f8ae 1998 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
34a5e1a2 1999 ecbdata.found_changesp = &o->found_changes;
cf1b7869 2000 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
690ed843 2001 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
d68fe26f 2002 check_blank_at_eof(&mf1, &mf2, &ecbdata);
a3c158d4 2003 ecbdata.opt = o;
3e97c7c6 2004 ecbdata.header = header.len ? &header : NULL;
582aa00b 2005 xpp.flags = o->xdl_opts;
ee1e5412 2006 xecfg.ctxlen = o->context;
6d0e674a 2007 xecfg.interhunkctxlen = o->interhunkcontext;
6973dcae 2008 xecfg.flags = XDL_EMIT_FUNCNAMES;
45e7ca0f 2009 if (pe)
a013585b 2010 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
6973dcae
JH
2011 if (!diffopts)
2012 ;
cc44c765 2013 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 2014 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 2015 else if (!prefixcmp(diffopts, "-u"))
6973dcae 2016 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
882749a0
TR
2017 if (o->word_diff) {
2018 int i;
2019
f59a59e2
JS
2020 ecbdata.diff_words =
2021 xcalloc(1, sizeof(struct diff_words_data));
882749a0 2022 ecbdata.diff_words->type = o->word_diff;
4297c0ae 2023 ecbdata.diff_words->opt = o;
80c49c3d
TR
2024 if (!o->word_regex)
2025 o->word_regex = userdiff_word_regex(one);
2026 if (!o->word_regex)
2027 o->word_regex = userdiff_word_regex(two);
98a4d87b
BSSJ
2028 if (!o->word_regex)
2029 o->word_regex = diff_word_regex_cfg;
2b6a5417
JS
2030 if (o->word_regex) {
2031 ecbdata.diff_words->word_regex = (regex_t *)
2032 xmalloc(sizeof(regex_t));
2033 if (regcomp(ecbdata.diff_words->word_regex,
bf82940d
TR
2034 o->word_regex,
2035 REG_EXTENDED | REG_NEWLINE))
2b6a5417
JS
2036 die ("Invalid regular expression: %s",
2037 o->word_regex);
2038 }
882749a0
TR
2039 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2040 if (o->word_diff == diff_words_styles[i].type) {
2041 ecbdata.diff_words->style =
2042 &diff_words_styles[i];
2043 break;
2044 }
2045 }
2046 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2047 struct diff_words_style *st = ecbdata.diff_words->style;
2048 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2049 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2050 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2051 }
c0c77734 2052 }
8a3f524b 2053 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
dfea7900 2054 &xpp, &xecfg);
882749a0 2055 if (o->word_diff)
f59a59e2 2056 free_diff_words_data(&ecbdata);
04427ac8
JK
2057 if (textconv_one)
2058 free(mf1.ptr);
2059 if (textconv_two)
2060 free(mf2.ptr);
8cfe5f1c 2061 xdiff_clear_find_func(&xecfg);
6973dcae
JH
2062 }
2063
2064 free_ab_and_return:
3e97c7c6 2065 strbuf_release(&header);
fc3abdf5
JH
2066 diff_free_filespec_data(one);
2067 diff_free_filespec_data(two);
6973dcae
JH
2068 free(a_one);
2069 free(b_two);
2070 return;
2071}
2072
2073static void builtin_diffstat(const char *name_a, const char *name_b,
2074 struct diff_filespec *one,
2075 struct diff_filespec *two,
710158e3 2076 struct diffstat_t *diffstat,
0d21efa5 2077 struct diff_options *o,
710158e3 2078 int complete_rewrite)
6973dcae
JH
2079{
2080 mmfile_t mf1, mf2;
2081 struct diffstat_file *data;
2082
2083 data = diffstat_add(diffstat, name_a, name_b);
2084
2085 if (!one || !two) {
2086 data->is_unmerged = 1;
2087 return;
2088 }
ded0abc7
JK
2089
2090 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
ded0abc7 2091 data->is_binary = 1;
abb371a1
JK
2092 data->added = diff_filespec_size(two);
2093 data->deleted = diff_filespec_size(one);
ded0abc7
JK
2094 }
2095
2096 else if (complete_rewrite) {
710158e3
JH
2097 diff_populate_filespec(one, 0);
2098 diff_populate_filespec(two, 0);
2099 data->deleted = count_lines(one->data, one->size);
2100 data->added = count_lines(two->data, two->size);
710158e3 2101 }
6973dcae 2102
ded0abc7 2103 else {
6973dcae
JH
2104 /* Crazy xdl interfaces.. */
2105 xpparam_t xpp;
2106 xdemitconf_t xecfg;
6973dcae 2107
ded0abc7
JK
2108 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2109 die("unable to read files to diff");
2110
9ccd0a88 2111 memset(&xpp, 0, sizeof(xpp));
30b25010 2112 memset(&xecfg, 0, sizeof(xecfg));
582aa00b 2113 xpp.flags = o->xdl_opts;
8a3f524b 2114 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
dfea7900 2115 &xpp, &xecfg);
6973dcae 2116 }
fc3abdf5 2117
fc3abdf5
JH
2118 diff_free_filespec_data(one);
2119 diff_free_filespec_data(two);
6973dcae
JH
2120}
2121
88246898 2122static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 2123 const char *attr_path,
5ff10dd6
JH
2124 struct diff_filespec *one,
2125 struct diff_filespec *two,
2126 struct diff_options *o)
88246898
JS
2127{
2128 mmfile_t mf1, mf2;
2129 struct checkdiff_t data;
2130
2131 if (!two)
2132 return;
2133
2134 memset(&data, 0, sizeof(data));
88246898
JS
2135 data.filename = name_b ? name_b : name_a;
2136 data.lineno = 0;
1ba111d1 2137 data.o = o;
cd676a51 2138 data.ws_rule = whitespace_rule(attr_path);
a757c646 2139 data.conflict_marker_size = ll_merge_marker_size(attr_path);
88246898
JS
2140
2141 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2142 die("unable to read files to diff");
2143
5ff10dd6
JH
2144 /*
2145 * All the other codepaths check both sides, but not checking
2146 * the "old" side here is deliberate. We are checking the newly
2147 * introduced changes, and as long as the "new" side is text, we
2148 * can and should check what it introduces.
2149 */
29a3eefd 2150 if (diff_filespec_is_binary(two))
fc3abdf5 2151 goto free_and_return;
88246898
JS
2152 else {
2153 /* Crazy xdl interfaces.. */
2154 xpparam_t xpp;
2155 xdemitconf_t xecfg;
88246898 2156
9ccd0a88 2157 memset(&xpp, 0, sizeof(xpp));
30b25010 2158 memset(&xecfg, 0, sizeof(xecfg));
c35539eb 2159 xecfg.ctxlen = 1; /* at least one context line */
582aa00b 2160 xpp.flags = 0;
8a3f524b 2161 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
dfea7900 2162 &xpp, &xecfg);
877f23cc 2163
467babf8 2164 if (data.ws_rule & WS_BLANK_AT_EOF) {
d68fe26f
JH
2165 struct emit_callback ecbdata;
2166 int blank_at_eof;
2167
2168 ecbdata.ws_rule = data.ws_rule;
2169 check_blank_at_eof(&mf1, &mf2, &ecbdata);
8837d335 2170 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
d68fe26f 2171
467babf8
JH
2172 if (blank_at_eof) {
2173 static char *err;
2174 if (!err)
2175 err = whitespace_error_string(WS_BLANK_AT_EOF);
2176 fprintf(o->file, "%s:%d: %s.\n",
2177 data.filename, blank_at_eof, err);
2178 data.status = 1; /* report errors */
2179 }
877f23cc 2180 }
88246898 2181 }
fc3abdf5
JH
2182 free_and_return:
2183 diff_free_filespec_data(one);
2184 diff_free_filespec_data(two);
62c64895
WC
2185 if (data.status)
2186 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
2187}
2188
6973dcae
JH
2189struct diff_filespec *alloc_filespec(const char *path)
2190{
2191 int namelen = strlen(path);
2192 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2193
2194 memset(spec, 0, sizeof(*spec));
2195 spec->path = (char *)(spec + 1);
2196 memcpy(spec->path, path, namelen+1);
9fb88419 2197 spec->count = 1;
122aa6f9 2198 spec->is_binary = -1;
6973dcae
JH
2199 return spec;
2200}
2201
9fb88419
LT
2202void free_filespec(struct diff_filespec *spec)
2203{
2204 if (!--spec->count) {
2205 diff_free_filespec_data(spec);
2206 free(spec);
2207 }
2208}
2209
6973dcae
JH
2210void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2211 unsigned short mode)
2212{
2213 if (mode) {
2214 spec->mode = canon_mode(mode);
e702496e 2215 hashcpy(spec->sha1, sha1);
0bef57ee 2216 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
2217 }
2218}
2219
2220/*
5adf317b 2221 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
2222 * the work tree has that object contents, return true, so that
2223 * prepare_temp_file() does not have to inflate and extract.
2224 */
1510fea7 2225static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
2226{
2227 struct cache_entry *ce;
2228 struct stat st;
2229 int pos, len;
2230
150115ad
JH
2231 /*
2232 * We do not read the cache ourselves here, because the
6973dcae
JH
2233 * benchmark with my previous version that always reads cache
2234 * shows that it makes things worse for diff-tree comparing
2235 * two linux-2.6 kernel trees in an already checked out work
2236 * tree. This is because most diff-tree comparisons deal with
2237 * only a small number of files, while reading the cache is
2238 * expensive for a large project, and its cost outweighs the
2239 * savings we get by not inflating the object to a temporary
2240 * file. Practically, this code only helps when we are used
2241 * by diff-cache --cached, which does read the cache before
2242 * calling us.
2243 */
2244 if (!active_cache)
2245 return 0;
2246
1510fea7
SP
2247 /* We want to avoid the working directory if our caller
2248 * doesn't need the data in a normal file, this system
2249 * is rather slow with its stat/open/mmap/close syscalls,
2250 * and the object is contained in a pack file. The pack
2251 * is probably already open and will be faster to obtain
2252 * the data through than the working directory. Loose
2253 * objects however would tend to be slower as they need
2254 * to be individually opened and inflated.
2255 */
cd673c1f 2256 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1510fea7
SP
2257 return 0;
2258
6973dcae
JH
2259 len = strlen(name);
2260 pos = cache_name_pos(name, len);
2261 if (pos < 0)
2262 return 0;
2263 ce = active_cache[pos];
eadb5831
JH
2264
2265 /*
2266 * This is not the sha1 we are looking for, or
2267 * unreusable because it is not a regular file.
2268 */
2269 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 2270 return 0;
eadb5831 2271
150115ad
JH
2272 /*
2273 * If ce is marked as "assume unchanged", there is no
2274 * guarantee that work tree matches what we are looking for.
2275 */
b4d1690d 2276 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
150115ad
JH
2277 return 0;
2278
eadb5831
JH
2279 /*
2280 * If ce matches the file in the work tree, we can reuse it.
6973dcae 2281 */
eadb5831
JH
2282 if (ce_uptodate(ce) ||
2283 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2284 return 1;
2285
2286 return 0;
6973dcae
JH
2287}
2288
3afaa72d
JH
2289static int populate_from_stdin(struct diff_filespec *s)
2290{
f285a2d7 2291 struct strbuf buf = STRBUF_INIT;
c32f749f 2292 size_t size = 0;
af6eb822 2293
f1696ee3 2294 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 2295 return error("error while reading from stdin %s",
3afaa72d 2296 strerror(errno));
af6eb822 2297
3afaa72d 2298 s->should_munmap = 0;
c32f749f
RS
2299 s->data = strbuf_detach(&buf, &size);
2300 s->size = size;
3afaa72d
JH
2301 s->should_free = 1;
2302 return 0;
2303}
2304
04786756
LT
2305static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2306{
2307 int len;
8e08b419
JH
2308 char *data = xmalloc(100), *dirty = "";
2309
2310 /* Are we looking at the work tree? */
85adbf2f 2311 if (s->dirty_submodule)
8e08b419
JH
2312 dirty = "-dirty";
2313
04786756 2314 len = snprintf(data, 100,
8e08b419 2315 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
04786756
LT
2316 s->data = data;
2317 s->size = len;
2318 s->should_free = 1;
2319 if (size_only) {
2320 s->data = NULL;
2321 free(data);
2322 }
2323 return 0;
2324}
2325
6973dcae
JH
2326/*
2327 * While doing rename detection and pickaxe operation, we may need to
2328 * grab the data for the blob (or file) for our own in-core comparison.
2329 * diff_filespec has data and size fields for this purpose.
2330 */
2331int diff_populate_filespec(struct diff_filespec *s, int size_only)
2332{
2333 int err = 0;
2334 if (!DIFF_FILE_VALID(s))
2335 die("internal error: asking to populate invalid file.");
2336 if (S_ISDIR(s->mode))
2337 return -1;
2338
6973dcae 2339 if (s->data)
fc3abdf5 2340 return 0;
04786756 2341
6e0b8ed6
JH
2342 if (size_only && 0 < s->size)
2343 return 0;
2344
302b9282 2345 if (S_ISGITLINK(s->mode))
04786756
LT
2346 return diff_populate_gitlink(s, size_only);
2347
6973dcae 2348 if (!s->sha1_valid ||
1510fea7 2349 reuse_worktree_file(s->path, s->sha1, 0)) {
f285a2d7 2350 struct strbuf buf = STRBUF_INIT;
6973dcae
JH
2351 struct stat st;
2352 int fd;
6c510bee 2353
3afaa72d
JH
2354 if (!strcmp(s->path, "-"))
2355 return populate_from_stdin(s);
2356
6973dcae
JH
2357 if (lstat(s->path, &st) < 0) {
2358 if (errno == ENOENT) {
2359 err_empty:
2360 err = -1;
2361 empty:
d2543b8e 2362 s->data = (char *)"";
6973dcae
JH
2363 s->size = 0;
2364 return err;
2365 }
2366 }
dc49cd76 2367 s->size = xsize_t(st.st_size);
6973dcae
JH
2368 if (!s->size)
2369 goto empty;
6973dcae 2370 if (S_ISLNK(st.st_mode)) {
cf219d8c
LT
2371 struct strbuf sb = STRBUF_INIT;
2372
2373 if (strbuf_readlink(&sb, s->path, s->size))
6973dcae 2374 goto err_empty;
0956a6db
RS
2375 s->size = sb.len;
2376 s->data = strbuf_detach(&sb, NULL);
cf219d8c 2377 s->should_free = 1;
6973dcae
JH
2378 return 0;
2379 }
cf219d8c
LT
2380 if (size_only)
2381 return 0;
6973dcae
JH
2382 fd = open(s->path, O_RDONLY);
2383 if (fd < 0)
2384 goto err_empty;
c4712e45 2385 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 2386 close(fd);
6973dcae 2387 s->should_munmap = 1;
6c510bee
LT
2388
2389 /*
2390 * Convert from working tree format to canonical git format
2391 */
21e5ad50 2392 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 2393 size_t size = 0;
6c510bee
LT
2394 munmap(s->data, s->size);
2395 s->should_munmap = 0;
c32f749f
RS
2396 s->data = strbuf_detach(&buf, &size);
2397 s->size = size;
6c510bee
LT
2398 s->should_free = 1;
2399 }
6973dcae
JH
2400 }
2401 else {
21666f1a 2402 enum object_type type;
c50c4316 2403 if (size_only) {
21666f1a 2404 type = sha1_object_info(s->sha1, &s->size);
c50c4316
NP
2405 if (type < 0)
2406 die("unable to read %s", sha1_to_hex(s->sha1));
2407 } else {
21666f1a 2408 s->data = read_sha1_file(s->sha1, &type, &s->size);
c50c4316
NP
2409 if (!s->data)
2410 die("unable to read %s", sha1_to_hex(s->sha1));
6973dcae
JH
2411 s->should_free = 1;
2412 }
2413 }
2414 return 0;
2415}
2416
8ae92e63 2417void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
2418{
2419 if (s->should_free)
2420 free(s->data);
2421 else if (s->should_munmap)
2422 munmap(s->data, s->size);
fc3abdf5
JH
2423
2424 if (s->should_free || s->should_munmap) {
2425 s->should_free = s->should_munmap = 0;
2426 s->data = NULL;
2427 }
eede7b7d
JK
2428}
2429
2430void diff_free_filespec_data(struct diff_filespec *s)
2431{
8ae92e63 2432 diff_free_filespec_blob(s);
6973dcae
JH
2433 free(s->cnt_data);
2434 s->cnt_data = NULL;
2435}
2436
4e218f54 2437static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
6973dcae
JH
2438 void *blob,
2439 unsigned long size,
2440 const unsigned char *sha1,
2441 int mode)
2442{
2443 int fd;
4e218f54 2444 struct strbuf buf = STRBUF_INIT;
003b33a8
DA
2445 struct strbuf template = STRBUF_INIT;
2446 char *path_dup = xstrdup(path);
2447 const char *base = basename(path_dup);
6973dcae 2448
003b33a8
DA
2449 /* Generate "XXXXXX_basename.ext" */
2450 strbuf_addstr(&template, "XXXXXX_");
2451 strbuf_addstr(&template, base);
2452
2453 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2454 strlen(base) + 1);
6973dcae 2455 if (fd < 0)
d824cbba 2456 die_errno("unable to create temp-file");
4e218f54
JS
2457 if (convert_to_working_tree(path,
2458 (const char *)blob, (size_t)size, &buf)) {
2459 blob = buf.buf;
2460 size = buf.len;
2461 }
93822c22 2462 if (write_in_full(fd, blob, size) != size)
0721c314 2463 die_errno("unable to write temp-file");
6973dcae
JH
2464 close(fd);
2465 temp->name = temp->tmp_path;
2466 strcpy(temp->hex, sha1_to_hex(sha1));
2467 temp->hex[40] = 0;
2468 sprintf(temp->mode, "%06o", mode);
4e218f54 2469 strbuf_release(&buf);
003b33a8
DA
2470 strbuf_release(&template);
2471 free(path_dup);
6973dcae
JH
2472}
2473
479b0ae8
JK
2474static struct diff_tempfile *prepare_temp_file(const char *name,
2475 struct diff_filespec *one)
6973dcae 2476{
479b0ae8
JK
2477 struct diff_tempfile *temp = claim_diff_tempfile();
2478
6973dcae
JH
2479 if (!DIFF_FILE_VALID(one)) {
2480 not_a_valid_file:
2481 /* A '-' entry produces this for file-2, and
2482 * a '+' entry produces this for file-1.
2483 */
2484 temp->name = "/dev/null";
2485 strcpy(temp->hex, ".");
2486 strcpy(temp->mode, ".");
479b0ae8
JK
2487 return temp;
2488 }
2489
2490 if (!remove_tempfile_installed) {
2491 atexit(remove_tempfile);
57b235a4 2492 sigchain_push_common(remove_tempfile_on_signal);
479b0ae8 2493 remove_tempfile_installed = 1;
6973dcae
JH
2494 }
2495
2496 if (!one->sha1_valid ||
1510fea7 2497 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
2498 struct stat st;
2499 if (lstat(name, &st) < 0) {
2500 if (errno == ENOENT)
2501 goto not_a_valid_file;
d824cbba 2502 die_errno("stat(%s)", name);
6973dcae
JH
2503 }
2504 if (S_ISLNK(st.st_mode)) {
3cd7388d
JK
2505 struct strbuf sb = STRBUF_INIT;
2506 if (strbuf_readlink(&sb, name, st.st_size) < 0)
0721c314 2507 die_errno("readlink(%s)", name);
3cd7388d 2508 prep_temp_blob(name, temp, sb.buf, sb.len,
6973dcae
JH
2509 (one->sha1_valid ?
2510 one->sha1 : null_sha1),
2511 (one->sha1_valid ?
2512 one->mode : S_IFLNK));
3cd7388d 2513 strbuf_release(&sb);
6973dcae
JH
2514 }
2515 else {
2516 /* we can borrow from the file in the work tree */
2517 temp->name = name;
2518 if (!one->sha1_valid)
2519 strcpy(temp->hex, sha1_to_hex(null_sha1));
2520 else
2521 strcpy(temp->hex, sha1_to_hex(one->sha1));
2522 /* Even though we may sometimes borrow the
2523 * contents from the work tree, we always want
2524 * one->mode. mode is trustworthy even when
2525 * !(one->sha1_valid), as long as
2526 * DIFF_FILE_VALID(one).
2527 */
2528 sprintf(temp->mode, "%06o", one->mode);
2529 }
479b0ae8 2530 return temp;
6973dcae
JH
2531 }
2532 else {
2533 if (diff_populate_filespec(one, 0))
2534 die("cannot read data blob for %s", one->path);
4e218f54 2535 prep_temp_blob(name, temp, one->data, one->size,
6973dcae
JH
2536 one->sha1, one->mode);
2537 }
479b0ae8 2538 return temp;
6973dcae
JH
2539}
2540
6973dcae
JH
2541/* An external diff command takes:
2542 *
2543 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2544 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2545 *
2546 */
2547static void run_external_diff(const char *pgm,
2548 const char *name,
2549 const char *other,
2550 struct diff_filespec *one,
2551 struct diff_filespec *two,
2552 const char *xfrm_msg,
2553 int complete_rewrite)
2554{
2555 const char *spawn_arg[10];
6973dcae 2556 int retval;
6973dcae
JH
2557 const char **arg = &spawn_arg[0];
2558
6973dcae 2559 if (one && two) {
479b0ae8
JK
2560 struct diff_tempfile *temp_one, *temp_two;
2561 const char *othername = (other ? other : name);
2562 temp_one = prepare_temp_file(name, one);
2563 temp_two = prepare_temp_file(othername, two);
6973dcae
JH
2564 *arg++ = pgm;
2565 *arg++ = name;
479b0ae8
JK
2566 *arg++ = temp_one->name;
2567 *arg++ = temp_one->hex;
2568 *arg++ = temp_one->mode;
2569 *arg++ = temp_two->name;
2570 *arg++ = temp_two->hex;
2571 *arg++ = temp_two->mode;
6973dcae
JH
2572 if (other) {
2573 *arg++ = other;
2574 *arg++ = xfrm_msg;
2575 }
2576 } else {
2577 *arg++ = pgm;
2578 *arg++ = name;
2579 }
2580 *arg = NULL;
d5535ec7 2581 fflush(NULL);
7ed7fac4 2582 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
6973dcae
JH
2583 remove_tempfile();
2584 if (retval) {
2585 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2586 exit(1);
2587 }
2588}
2589
b67b9612
JH
2590static int similarity_index(struct diff_filepair *p)
2591{
2592 return p->score * 100 / MAX_SCORE;
2593}
2594
2595static void fill_metainfo(struct strbuf *msg,
2596 const char *name,
2597 const char *other,
2598 struct diff_filespec *one,
2599 struct diff_filespec *two,
2600 struct diff_options *o,
37466447 2601 struct diff_filepair *p,
5977744d 2602 int *must_show_header,
37466447 2603 int use_color)
b67b9612 2604{
37466447
BW
2605 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2606 const char *reset = diff_get_color(use_color, DIFF_RESET);
7be57610
BY
2607 struct strbuf *msgbuf;
2608 char *line_prefix = "";
2609
296c6bb2 2610 *must_show_header = 1;
7be57610
BY
2611 if (o->output_prefix) {
2612 msgbuf = o->output_prefix(o, o->output_prefix_data);
2613 line_prefix = msgbuf->buf;
2614 }
b67b9612
JH
2615 strbuf_init(msg, PATH_MAX * 2 + 300);
2616 switch (p->status) {
2617 case DIFF_STATUS_COPIED:
98ad90fb
JH
2618 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2619 line_prefix, set, similarity_index(p));
2620 strbuf_addf(msg, "%s\n%s%scopy from ",
2621 reset, line_prefix, set);
b67b9612 2622 quote_c_style(name, msg, NULL, 0);
98ad90fb 2623 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
b67b9612 2624 quote_c_style(other, msg, NULL, 0);
37466447 2625 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
2626 break;
2627 case DIFF_STATUS_RENAMED:
98ad90fb
JH
2628 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2629 line_prefix, set, similarity_index(p));
2630 strbuf_addf(msg, "%s\n%s%srename from ",
2631 reset, line_prefix, set);
b67b9612 2632 quote_c_style(name, msg, NULL, 0);
98ad90fb
JH
2633 strbuf_addf(msg, "%s\n%s%srename to ",
2634 reset, line_prefix, set);
b67b9612 2635 quote_c_style(other, msg, NULL, 0);
37466447 2636 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
2637 break;
2638 case DIFF_STATUS_MODIFIED:
2639 if (p->score) {
98ad90fb
JH
2640 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2641 line_prefix,
37466447 2642 set, similarity_index(p), reset);
b67b9612
JH
2643 break;
2644 }
2645 /* fallthru */
2646 default:
296c6bb2 2647 *must_show_header = 0;
b67b9612
JH
2648 }
2649 if (one && two && hashcmp(one->sha1, two->sha1)) {
2650 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2651
2652 if (DIFF_OPT_TST(o, BINARY)) {
2653 mmfile_t mf;
2654 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2655 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2656 abbrev = 40;
2657 }
e13f38a3 2658 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3e5a188f
JH
2659 find_unique_abbrev(one->sha1, abbrev));
2660 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
b67b9612
JH
2661 if (one->mode == two->mode)
2662 strbuf_addf(msg, " %06o", one->mode);
37466447 2663 strbuf_addf(msg, "%s\n", reset);
b67b9612 2664 }
b67b9612
JH
2665}
2666
6973dcae
JH
2667static void run_diff_cmd(const char *pgm,
2668 const char *name,
2669 const char *other,
cd676a51 2670 const char *attr_path,
6973dcae
JH
2671 struct diff_filespec *one,
2672 struct diff_filespec *two,
b67b9612 2673 struct strbuf *msg,
051308f6 2674 struct diff_options *o,
b67b9612 2675 struct diff_filepair *p)
6973dcae 2676{
b67b9612
JH
2677 const char *xfrm_msg = NULL;
2678 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
296c6bb2 2679 int must_show_header = 0;
b67b9612 2680
8f67f8ae 2681 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2682 pgm = NULL;
2683 else {
be58e70d
JK
2684 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2685 if (drv && drv->external)
2686 pgm = drv->external;
f1af60bd
JH
2687 }
2688
37466447
BW
2689 if (msg) {
2690 /*
2691 * don't use colors when the header is intended for an
2692 * external diff driver
2693 */
2694 fill_metainfo(msg, name, other, one, two, o, p,
5977744d 2695 &must_show_header,
37466447
BW
2696 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2697 xfrm_msg = msg->len ? msg->buf : NULL;
2698 }
2699
6973dcae
JH
2700 if (pgm) {
2701 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2702 complete_rewrite);
2703 return;
2704 }
2705 if (one && two)
2706 builtin_diff(name, other ? other : name,
296c6bb2
CC
2707 one, two, xfrm_msg, must_show_header,
2708 o, complete_rewrite);
6973dcae 2709 else
c0c77734 2710 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
2711}
2712
2713static void diff_fill_sha1_info(struct diff_filespec *one)
2714{
2715 if (DIFF_FILE_VALID(one)) {
2716 if (!one->sha1_valid) {
2717 struct stat st;
5332b2af
JS
2718 if (!strcmp(one->path, "-")) {
2719 hashcpy(one->sha1, null_sha1);
2720 return;
2721 }
6973dcae 2722 if (lstat(one->path, &st) < 0)
0721c314 2723 die_errno("stat '%s'", one->path);
6973dcae 2724 if (index_path(one->sha1, one->path, &st, 0))
d7530708 2725 die("cannot hash %s", one->path);
6973dcae
JH
2726 }
2727 }
2728 else
e702496e 2729 hashclr(one->sha1);
6973dcae
JH
2730}
2731
cd676a51
JH
2732static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2733{
2734 /* Strip the prefix but do not molest /dev/null and absolute paths */
d8faea9d 2735 if (*namep && **namep != '/') {
cd676a51 2736 *namep += prefix_length;
d8faea9d
JN
2737 if (**namep == '/')
2738 ++*namep;
2739 }
2740 if (*otherp && **otherp != '/') {
cd676a51 2741 *otherp += prefix_length;
d8faea9d
JN
2742 if (**otherp == '/')
2743 ++*otherp;
2744 }
cd676a51
JH
2745}
2746
6973dcae
JH
2747static void run_diff(struct diff_filepair *p, struct diff_options *o)
2748{
2749 const char *pgm = external_diff();
663af342 2750 struct strbuf msg;
663af342
PH
2751 struct diff_filespec *one = p->one;
2752 struct diff_filespec *two = p->two;
6973dcae
JH
2753 const char *name;
2754 const char *other;
cd676a51 2755 const char *attr_path;
663af342 2756
cd676a51
JH
2757 name = p->one->path;
2758 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2759 attr_path = name;
2760 if (o->prefix_length)
2761 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
2762
2763 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51 2764 run_diff_cmd(pgm, name, NULL, attr_path,
b67b9612 2765 NULL, NULL, NULL, o, p);
6973dcae
JH
2766 return;
2767 }
2768
6973dcae
JH
2769 diff_fill_sha1_info(one);
2770 diff_fill_sha1_info(two);
2771
6973dcae
JH
2772 if (!pgm &&
2773 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2774 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
b67b9612
JH
2775 /*
2776 * a filepair that changes between file and symlink
6973dcae
JH
2777 * needs to be split into deletion and creation.
2778 */
2779 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51 2780 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 2781 one, null, &msg, o, p);
6973dcae 2782 free(null);
b67b9612
JH
2783 strbuf_release(&msg);
2784
6973dcae 2785 null = alloc_filespec(one->path);
cd676a51 2786 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 2787 null, two, &msg, o, p);
6973dcae
JH
2788 free(null);
2789 }
2790 else
cd676a51 2791 run_diff_cmd(pgm, name, other, attr_path,
b67b9612 2792 one, two, &msg, o, p);
6973dcae 2793
663af342 2794 strbuf_release(&msg);
6973dcae
JH
2795}
2796
2797static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2798 struct diffstat_t *diffstat)
2799{
2800 const char *name;
2801 const char *other;
710158e3 2802 int complete_rewrite = 0;
6973dcae
JH
2803
2804 if (DIFF_PAIR_UNMERGED(p)) {
2805 /* unmerged */
0d21efa5 2806 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2807 return;
2808 }
2809
2810 name = p->one->path;
2811 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2812
cd676a51
JH
2813 if (o->prefix_length)
2814 strip_prefix(o->prefix_length, &name, &other);
2815
6973dcae
JH
2816 diff_fill_sha1_info(p->one);
2817 diff_fill_sha1_info(p->two);
2818
710158e3
JH
2819 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2820 complete_rewrite = 1;
0d21efa5 2821 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2822}
2823
88246898
JS
2824static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2825{
2826 const char *name;
2827 const char *other;
cd676a51 2828 const char *attr_path;
88246898
JS
2829
2830 if (DIFF_PAIR_UNMERGED(p)) {
2831 /* unmerged */
2832 return;
2833 }
2834
2835 name = p->one->path;
2836 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
2837 attr_path = other ? other : name;
2838
2839 if (o->prefix_length)
2840 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
2841
2842 diff_fill_sha1_info(p->one);
2843 diff_fill_sha1_info(p->two);
2844
cd676a51 2845 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
2846}
2847
6973dcae
JH
2848void diff_setup(struct diff_options *options)
2849{
be4f2b40 2850 memcpy(options, &default_diff_options, sizeof(*options));
c0c77734
DB
2851
2852 options->file = stdout;
2853
6973dcae
JH
2854 options->line_termination = '\n';
2855 options->break_opt = -1;
2856 options->rename_limit = -1;
7df7c019 2857 options->dirstat_percent = 3;
ee1e5412 2858 options->context = 3;
6973dcae
JH
2859
2860 options->change = diff_change;
2861 options->add_remove = diff_addremove;
6b2f2d98 2862 if (diff_use_color_default > 0)
8f67f8ae 2863 DIFF_OPT_SET(options, COLOR_DIFF);
b68ea12e 2864 options->detect_rename = diff_detect_rename_default;
eab9a40b 2865
f89504dd
EC
2866 if (diff_no_prefix) {
2867 options->a_prefix = options->b_prefix = "";
2868 } else if (!diff_mnemonic_prefix) {
a5a818ee
JH
2869 options->a_prefix = "a/";
2870 options->b_prefix = "b/";
2871 }
6973dcae
JH
2872}
2873
2874int diff_setup_done(struct diff_options *options)
2875{
d7de00f7
TH
2876 int count = 0;
2877
2878 if (options->output_format & DIFF_FORMAT_NAME)
2879 count++;
2880 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2881 count++;
2882 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2883 count++;
2884 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2885 count++;
2886 if (count > 1)
2887 die("--name-only, --name-status, --check and -s are mutually exclusive");
2888
f245194f
JH
2889 /*
2890 * Most of the time we can say "there are changes"
2891 * only by checking if there are changed paths, but
2892 * --ignore-whitespace* options force us to look
97bf2a08 2893 * inside contents.
f245194f
JH
2894 */
2895
2896 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2897 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2898 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2899 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2900 else
2901 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2902
8f67f8ae 2903 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
2904 options->detect_rename = DIFF_DETECT_COPY;
2905
cd676a51
JH
2906 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2907 options->prefix = NULL;
2908 if (options->prefix)
2909 options->prefix_length = strlen(options->prefix);
2910 else
2911 options->prefix_length = 0;
2912
c6744349
TH
2913 if (options->output_format & (DIFF_FORMAT_NAME |
2914 DIFF_FORMAT_NAME_STATUS |
2915 DIFF_FORMAT_CHECKDIFF |
2916 DIFF_FORMAT_NO_OUTPUT))
2917 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2918 DIFF_FORMAT_NUMSTAT |
c6744349 2919 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2920 DIFF_FORMAT_SHORTSTAT |
7df7c019 2921 DIFF_FORMAT_DIRSTAT |
c6744349
TH
2922 DIFF_FORMAT_SUMMARY |
2923 DIFF_FORMAT_PATCH);
2924
6973dcae
JH
2925 /*
2926 * These cases always need recursive; we do not drop caller-supplied
2927 * recursive bits for other formats here.
2928 */
c6744349 2929 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2930 DIFF_FORMAT_NUMSTAT |
c6744349 2931 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2932 DIFF_FORMAT_SHORTSTAT |
7df7c019 2933 DIFF_FORMAT_DIRSTAT |
d7014dc0 2934 DIFF_FORMAT_SUMMARY |
c6744349 2935 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 2936 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2937 /*
3969cf7d 2938 * Also pickaxe would not work very well if you do not say recursive
5e363541 2939 */
3969cf7d 2940 if (options->pickaxe)
8f67f8ae 2941 DIFF_OPT_SET(options, RECURSIVE);
ae6d5c1b
JL
2942 /*
2943 * When patches are generated, submodules diffed against the work tree
2944 * must be checked for dirtiness too so it can be shown in the output
2945 */
2946 if (options->output_format & DIFF_FORMAT_PATCH)
2947 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
5e363541 2948
6973dcae
JH
2949 if (options->detect_rename && options->rename_limit < 0)
2950 options->rename_limit = diff_rename_limit_default;
2951 if (options->setup & DIFF_SETUP_USE_CACHE) {
2952 if (!active_cache)
2953 /* read-cache does not die even when it fails
2954 * so it is safe for us to do this here. Also
2955 * it does not smudge active_cache or active_nr
2956 * when it fails, so we do not have to worry about
2957 * cleaning it up ourselves either.
2958 */
2959 read_cache();
2960 }
6973dcae
JH
2961 if (options->abbrev <= 0 || 40 < options->abbrev)
2962 options->abbrev = 40; /* full */
2963
68aacb2f
JH
2964 /*
2965 * It does not make sense to show the first hit we happened
2966 * to have found. It does not make sense not to return with
2967 * exit code in such a case either.
2968 */
90b19941 2969 if (DIFF_OPT_TST(options, QUICK)) {
68aacb2f 2970 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 2971 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
2972 }
2973
6973dcae
JH
2974 return 0;
2975}
2976
d2543b8e 2977static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2978{
2979 char c, *eq;
2980 int len;
2981
2982 if (*arg != '-')
2983 return 0;
2984 c = *++arg;
2985 if (!c)
2986 return 0;
2987 if (c == arg_short) {
2988 c = *++arg;
2989 if (!c)
2990 return 1;
2991 if (val && isdigit(c)) {
2992 char *end;
2993 int n = strtoul(arg, &end, 10);
2994 if (*end)
2995 return 0;
2996 *val = n;
2997 return 1;
2998 }
2999 return 0;
3000 }
3001 if (c != '-')
3002 return 0;
3003 arg++;
3004 eq = strchr(arg, '=');
3005 if (eq)
3006 len = eq - arg;
3007 else
3008 len = strlen(arg);
3009 if (!len || strncmp(arg, arg_long, len))
3010 return 0;
3011 if (eq) {
3012 int n;
3013 char *end;
3014 if (!isdigit(*++eq))
3015 return 0;
3016 n = strtoul(eq, &end, 10);
3017 if (*end)
3018 return 0;
3019 *val = n;
3020 }
3021 return 1;
3022}
3023
16befb8b
JH
3024static int diff_scoreopt_parse(const char *opt);
3025
dea007fb
MM
3026static inline int short_opt(char opt, const char **argv,
3027 const char **optarg)
3028{
3029 const char *arg = argv[0];
3030 if (arg[0] != '-' || arg[1] != opt)
3031 return 0;
3032 if (arg[2] != '\0') {
3033 *optarg = arg + 2;
3034 return 1;
3035 }
3036 if (!argv[1])
3037 die("Option '%c' requires a value", opt);
3038 *optarg = argv[1];
3039 return 2;
3040}
3041
3042int parse_long_opt(const char *opt, const char **argv,
3043 const char **optarg)
3044{
3045 const char *arg = argv[0];
3046 if (arg[0] != '-' || arg[1] != '-')
3047 return 0;
3048 arg += strlen("--");
3049 if (prefixcmp(arg, opt))
3050 return 0;
3051 arg += strlen(opt);
3052 if (*arg == '=') { /* sticked form: --option=value */
3053 *optarg = arg + 1;
3054 return 1;
3055 }
3056 if (*arg != '\0')
3057 return 0;
3058 /* separate form: --option value */
3059 if (!argv[1])
3060 die("Option '--%s' requires a value", opt);
3061 *optarg = argv[1];
3062 return 2;
3063}
3064
4d7f7a4a
JN
3065static int stat_opt(struct diff_options *options, const char **av)
3066{
3067 const char *arg = av[0];
3068 char *end;
3069 int width = options->stat_width;
3070 int name_width = options->stat_name_width;
1e57208e 3071 int argcount = 1;
4d7f7a4a
JN
3072
3073 arg += strlen("--stat");
3074 end = (char *)arg;
3075
3076 switch (*arg) {
3077 case '-':
1e57208e
MM
3078 if (!prefixcmp(arg, "-width")) {
3079 arg += strlen("-width");
3080 if (*arg == '=')
3081 width = strtoul(arg + 1, &end, 10);
3082 else if (!*arg && !av[1])
3083 die("Option '--stat-width' requires a value");
3084 else if (!*arg) {
3085 width = strtoul(av[1], &end, 10);
3086 argcount = 2;
3087 }
3088 } else if (!prefixcmp(arg, "-name-width")) {
3089 arg += strlen("-name-width");
3090 if (*arg == '=')
3091 name_width = strtoul(arg + 1, &end, 10);
3092 else if (!*arg && !av[1])
3093 die("Option '--stat-name-width' requires a value");
3094 else if (!*arg) {
3095 name_width = strtoul(av[1], &end, 10);
3096 argcount = 2;
3097 }
3098 }
4d7f7a4a
JN
3099 break;
3100 case '=':
3101 width = strtoul(arg+1, &end, 10);
3102 if (*end == ',')
3103 name_width = strtoul(end+1, &end, 10);
3104 }
3105
3106 /* Important! This checks all the error cases! */
3107 if (*end)
3108 return 0;
3109 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3110 options->stat_name_width = name_width;
3111 options->stat_width = width;
1e57208e 3112 return argcount;
4d7f7a4a
JN
3113}
3114
6973dcae
JH
3115int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3116{
3117 const char *arg = av[0];
dea007fb
MM
3118 const char *optarg;
3119 int argcount;
d054680c
PH
3120
3121 /* Output format options */
1c9eecff 3122 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
c6744349 3123 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 3124 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 3125 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
3126 else if (!strcmp(arg, "--raw"))
3127 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 3128 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 3129 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 3130 else if (!strcmp(arg, "--numstat"))
74e2abe5 3131 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 3132 else if (!strcmp(arg, "--shortstat"))
ebd124c6 3133 options->output_format |= DIFF_FORMAT_SHORTSTAT;
7df7c019
LT
3134 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3135 options->output_format |= DIFF_FORMAT_DIRSTAT;
f88d225f
JH
3136 else if (!strcmp(arg, "--cumulative")) {
3137 options->output_format |= DIFF_FORMAT_DIRSTAT;
3138 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
fd33777b
HO
3139 } else if (opt_arg(arg, 0, "dirstat-by-file",
3140 &options->dirstat_percent)) {
3141 options->output_format |= DIFF_FORMAT_DIRSTAT;
3142 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
f88d225f 3143 }
d054680c
PH
3144 else if (!strcmp(arg, "--check"))
3145 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3146 else if (!strcmp(arg, "--summary"))
3147 options->output_format |= DIFF_FORMAT_SUMMARY;
3148 else if (!strcmp(arg, "--patch-with-stat"))
3149 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3150 else if (!strcmp(arg, "--name-only"))
3151 options->output_format |= DIFF_FORMAT_NAME;
3152 else if (!strcmp(arg, "--name-status"))
3153 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3154 else if (!strcmp(arg, "-s"))
3155 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4d7f7a4a
JN
3156 else if (!prefixcmp(arg, "--stat"))
3157 /* --stat, --stat-width, or --stat-name-width */
3158 return stat_opt(options, av);
d054680c
PH
3159
3160 /* renames options */
37ab5156
KB
3161 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3162 !strcmp(arg, "--break-rewrites")) {
8f67f8ae 3163 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
07cd7265 3164 return error("invalid argument to -B: %s", arg+2);
6973dcae 3165 }
f611ddc7
YD
3166 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3167 !strcmp(arg, "--find-renames")) {
8f67f8ae 3168 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
07cd7265 3169 return error("invalid argument to -M: %s", arg+2);
6973dcae
JH
3170 options->detect_rename = DIFF_DETECT_RENAME;
3171 }
f611ddc7
YD
3172 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3173 !strcmp(arg, "--find-copies")) {
ca6c0970 3174 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
3175 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3176 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
07cd7265 3177 return error("invalid argument to -C: %s", arg+2);
6973dcae
JH
3178 options->detect_rename = DIFF_DETECT_COPY;
3179 }
d054680c
PH
3180 else if (!strcmp(arg, "--no-renames"))
3181 options->detect_rename = 0;
cd676a51
JH
3182 else if (!strcmp(arg, "--relative"))
3183 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
3184 else if (!prefixcmp(arg, "--relative=")) {
3185 DIFF_OPT_SET(options, RELATIVE_NAME);
3186 options->prefix = arg + 11;
3187 }
d054680c
PH
3188
3189 /* xdiff options */
3190 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
628d5c2b 3191 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
d054680c 3192 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
628d5c2b 3193 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
d054680c 3194 else if (!strcmp(arg, "--ignore-space-at-eol"))
628d5c2b 3195 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
34292bdd 3196 else if (!strcmp(arg, "--patience"))
628d5c2b 3197 DIFF_XDL_SET(options, PATIENCE_DIFF);
d054680c
PH
3198
3199 /* flags options */
3200 else if (!strcmp(arg, "--binary")) {
3201 options->output_format |= DIFF_FORMAT_PATCH;
3202 DIFF_OPT_SET(options, BINARY);
3203 }
3204 else if (!strcmp(arg, "--full-index"))
3205 DIFF_OPT_SET(options, FULL_INDEX);
3206 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3207 DIFF_OPT_SET(options, TEXT);
3208 else if (!strcmp(arg, "-R"))
3209 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 3210 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 3211 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 3212 else if (!strcmp(arg, "--follow"))
8f67f8ae 3213 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 3214 else if (!strcmp(arg, "--color"))
8f67f8ae 3215 DIFF_OPT_SET(options, COLOR_DIFF);
73e9da01
ML
3216 else if (!prefixcmp(arg, "--color=")) {
3217 int value = git_config_colorbool(NULL, arg+8, -1);
3218 if (value == 0)
3219 DIFF_OPT_CLR(options, COLOR_DIFF);
3220 else if (value > 0)
3221 DIFF_OPT_SET(options, COLOR_DIFF);
3222 else
3223 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3224 }
fef88bb0 3225 else if (!strcmp(arg, "--no-color"))
8f67f8ae 3226 DIFF_OPT_CLR(options, COLOR_DIFF);
628d5c2b
KC
3227 else if (!strcmp(arg, "--color-words")) {
3228 DIFF_OPT_SET(options, COLOR_DIFF);
882749a0 3229 options->word_diff = DIFF_WORDS_COLOR;
628d5c2b 3230 }
2b6a5417 3231 else if (!prefixcmp(arg, "--color-words=")) {
628d5c2b 3232 DIFF_OPT_SET(options, COLOR_DIFF);
882749a0 3233 options->word_diff = DIFF_WORDS_COLOR;
2b6a5417
JS
3234 options->word_regex = arg + 14;
3235 }
882749a0
TR
3236 else if (!strcmp(arg, "--word-diff")) {
3237 if (options->word_diff == DIFF_WORDS_NONE)
3238 options->word_diff = DIFF_WORDS_PLAIN;
3239 }
3240 else if (!prefixcmp(arg, "--word-diff=")) {
3241 const char *type = arg + 12;
3242 if (!strcmp(type, "plain"))
3243 options->word_diff = DIFF_WORDS_PLAIN;
3244 else if (!strcmp(type, "color")) {
3245 DIFF_OPT_SET(options, COLOR_DIFF);
3246 options->word_diff = DIFF_WORDS_COLOR;
3247 }
3248 else if (!strcmp(type, "porcelain"))
3249 options->word_diff = DIFF_WORDS_PORCELAIN;
3250 else if (!strcmp(type, "none"))
3251 options->word_diff = DIFF_WORDS_NONE;
3252 else
3253 die("bad --word-diff argument: %s", type);
3254 }
dea007fb 3255 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
882749a0
TR
3256 if (options->word_diff == DIFF_WORDS_NONE)
3257 options->word_diff = DIFF_WORDS_PLAIN;
dea007fb
MM
3258 options->word_regex = optarg;
3259 return argcount;
882749a0 3260 }
41bbf9d5 3261 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 3262 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 3263 else if (!strcmp(arg, "--quiet"))
90b19941 3264 DIFF_OPT_SET(options, QUICK);
72909bef 3265 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 3266 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 3267 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 3268 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
e10ea812
JK
3269 else if (!strcmp(arg, "--textconv"))
3270 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3271 else if (!strcmp(arg, "--no-textconv"))
3272 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
aee9c7d6
JL
3273 else if (!strcmp(arg, "--ignore-submodules")) {
3274 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
46a958b3 3275 handle_ignore_submodules_arg(options, "all");
aee9c7d6
JL
3276 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3277 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
46a958b3 3278 handle_ignore_submodules_arg(options, arg + 20);
aee9c7d6 3279 } else if (!strcmp(arg, "--submodule"))
752c0c24
JS
3280 DIFF_OPT_SET(options, SUBMODULE_LOG);
3281 else if (!prefixcmp(arg, "--submodule=")) {
3282 if (!strcmp(arg + 12, "log"))
3283 DIFF_OPT_SET(options, SUBMODULE_LOG);
3284 }
d054680c
PH
3285
3286 /* misc options */
3287 else if (!strcmp(arg, "-z"))
3288 options->line_termination = 0;
dea007fb
MM
3289 else if ((argcount = short_opt('l', av, &optarg))) {
3290 options->rename_limit = strtoul(optarg, NULL, 10);
3291 return argcount;
3292 }
3293 else if ((argcount = short_opt('S', av, &optarg))) {
3294 options->pickaxe = optarg;
f506b8e8
JH
3295 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3296 return argcount;
3297 } else if ((argcount = short_opt('G', av, &optarg))) {
3298 options->pickaxe = optarg;
3299 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
dea007fb
MM
3300 return argcount;
3301 }
d054680c 3302 else if (!strcmp(arg, "--pickaxe-all"))
f506b8e8 3303 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
d054680c 3304 else if (!strcmp(arg, "--pickaxe-regex"))
f506b8e8 3305 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
dea007fb
MM
3306 else if ((argcount = short_opt('O', av, &optarg))) {
3307 options->orderfile = optarg;
3308 return argcount;
3309 }
3310 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3311 options->filter = optarg;
3312 return argcount;
3313 }
d054680c
PH
3314 else if (!strcmp(arg, "--abbrev"))
3315 options->abbrev = DEFAULT_ABBREV;
3316 else if (!prefixcmp(arg, "--abbrev=")) {
3317 options->abbrev = strtoul(arg + 9, NULL, 10);
3318 if (options->abbrev < MINIMUM_ABBREV)
3319 options->abbrev = MINIMUM_ABBREV;
3320 else if (40 < options->abbrev)
3321 options->abbrev = 40;
3322 }
dea007fb
MM
3323 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3324 options->a_prefix = optarg;
3325 return argcount;
3326 }
3327 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3328 options->b_prefix = optarg;
3329 return argcount;
3330 }
eab9a40b
JS
3331 else if (!strcmp(arg, "--no-prefix"))
3332 options->a_prefix = options->b_prefix = "";
6d0e674a
RS
3333 else if (opt_arg(arg, '\0', "inter-hunk-context",
3334 &options->interhunkcontext))
3335 ;
dea007fb
MM
3336 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3337 options->file = fopen(optarg, "w");
8324b977 3338 if (!options->file)
9ec26eb7 3339 die_errno("Could not open '%s'", optarg);
c0c77734 3340 options->close_file = 1;
dea007fb 3341 return argcount;
c0c77734 3342 } else
6973dcae
JH
3343 return 0;
3344 return 1;
3345}
3346
10ae7526 3347int parse_rename_score(const char **cp_p)
6973dcae
JH
3348{
3349 unsigned long num, scale;
3350 int ch, dot;
3351 const char *cp = *cp_p;
3352
3353 num = 0;
3354 scale = 1;
3355 dot = 0;
eeefa7c9 3356 for (;;) {
6973dcae
JH
3357 ch = *cp;
3358 if ( !dot && ch == '.' ) {
3359 scale = 1;
3360 dot = 1;
3361 } else if ( ch == '%' ) {
3362 scale = dot ? scale*100 : 100;
3363 cp++; /* % is always at the end */
3364 break;
3365 } else if ( ch >= '0' && ch <= '9' ) {
3366 if ( scale < 100000 ) {
3367 scale *= 10;
3368 num = (num*10) + (ch-'0');
3369 }
3370 } else {
3371 break;
3372 }
3373 cp++;
3374 }
3375 *cp_p = cp;
3376
3377 /* user says num divided by scale and we say internally that
3378 * is MAX_SCORE * num / scale.
3379 */
dc49cd76 3380 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
3381}
3382
16befb8b 3383static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
3384{
3385 int opt1, opt2, cmd;
3386
3387 if (*opt++ != '-')
3388 return -1;
3389 cmd = *opt++;
37ab5156
KB
3390 if (cmd == '-') {
3391 /* convert the long-form arguments into short-form versions */
3392 if (!prefixcmp(opt, "break-rewrites")) {
3393 opt += strlen("break-rewrites");
3394 if (*opt == 0 || *opt++ == '=')
3395 cmd = 'B';
f611ddc7
YD
3396 } else if (!prefixcmp(opt, "find-copies")) {
3397 opt += strlen("find-copies");
37ab5156
KB
3398 if (*opt == 0 || *opt++ == '=')
3399 cmd = 'C';
f611ddc7
YD
3400 } else if (!prefixcmp(opt, "find-renames")) {
3401 opt += strlen("find-renames");
37ab5156
KB
3402 if (*opt == 0 || *opt++ == '=')
3403 cmd = 'M';
3404 }
3405 }
6973dcae
JH
3406 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3407 return -1; /* that is not a -M, -C nor -B option */
3408
10ae7526 3409 opt1 = parse_rename_score(&opt);
6973dcae
JH
3410 if (cmd != 'B')
3411 opt2 = 0;
3412 else {
3413 if (*opt == 0)
3414 opt2 = 0;
3415 else if (*opt != '/')
3416 return -1; /* we expect -B80/99 or -B80 */
3417 else {
3418 opt++;
10ae7526 3419 opt2 = parse_rename_score(&opt);
6973dcae
JH
3420 }
3421 }
3422 if (*opt != 0)
3423 return -1;
3424 return opt1 | (opt2 << 16);
3425}
3426
3427struct diff_queue_struct diff_queued_diff;
3428
3429void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3430{
3431 if (queue->alloc <= queue->nr) {
3432 queue->alloc = alloc_nr(queue->alloc);
3433 queue->queue = xrealloc(queue->queue,
3434 sizeof(dp) * queue->alloc);
3435 }
3436 queue->queue[queue->nr++] = dp;
3437}
3438
3439struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3440 struct diff_filespec *one,
3441 struct diff_filespec *two)
3442{
ef677686 3443 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
3444 dp->one = one;
3445 dp->two = two;
6973dcae
JH
3446 if (queue)
3447 diff_q(queue, dp);
3448 return dp;
3449}
3450
3451void diff_free_filepair(struct diff_filepair *p)
3452{
9fb88419
LT
3453 free_filespec(p->one);
3454 free_filespec(p->two);
6973dcae
JH
3455 free(p);
3456}
3457
3458/* This is different from find_unique_abbrev() in that
3459 * it stuffs the result with dots for alignment.
3460 */
3461const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3462{
3463 int abblen;
3464 const char *abbrev;
3465 if (len == 40)
3466 return sha1_to_hex(sha1);
3467
3468 abbrev = find_unique_abbrev(sha1, len);
6973dcae
JH
3469 abblen = strlen(abbrev);
3470 if (abblen < 37) {
3471 static char hex[41];
3472 if (len < abblen && abblen <= len + 2)
3473 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3474 else
3475 sprintf(hex, "%s...", abbrev);
3476 return hex;
3477 }
3478 return sha1_to_hex(sha1);
3479}
3480
663af342 3481static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 3482{
663af342
PH
3483 int line_termination = opt->line_termination;
3484 int inter_name_termination = line_termination ? '\t' : '\0';
7be57610
BY
3485 if (opt->output_prefix) {
3486 struct strbuf *msg = NULL;
3487 msg = opt->output_prefix(opt, opt->output_prefix_data);
3488 fprintf(opt->file, "%s", msg->buf);
3489 }
6973dcae 3490
663af342 3491 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
c0c77734
DB
3492 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3493 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3494 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
6973dcae 3495 }
663af342 3496 if (p->score) {
c0c77734
DB
3497 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3498 inter_name_termination);
663af342 3499 } else {
c0c77734 3500 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
6973dcae 3501 }
6973dcae 3502
cd676a51
JH
3503 if (p->status == DIFF_STATUS_COPIED ||
3504 p->status == DIFF_STATUS_RENAMED) {
3505 const char *name_a, *name_b;
3506 name_a = p->one->path;
3507 name_b = p->two->path;
3508 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734
DB
3509 write_name_quoted(name_a, opt->file, inter_name_termination);
3510 write_name_quoted(name_b, opt->file, line_termination);
663af342 3511 } else {
cd676a51
JH
3512 const char *name_a, *name_b;
3513 name_a = p->one->mode ? p->one->path : p->two->path;
3514 name_b = NULL;
3515 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 3516 write_name_quoted(name_a, opt->file, line_termination);
663af342 3517 }
6973dcae
JH
3518}
3519
3520int diff_unmodified_pair(struct diff_filepair *p)
3521{
3522 /* This function is written stricter than necessary to support
3523 * the currently implemented transformers, but the idea is to
3524 * let transformers to produce diff_filepairs any way they want,
3525 * and filter and clean them up here before producing the output.
3526 */
663af342 3527 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
3528
3529 if (DIFF_PAIR_UNMERGED(p))
3530 return 0; /* unmerged is interesting */
3531
6973dcae
JH
3532 /* deletion, addition, mode or type change
3533 * and rename are all interesting.
3534 */
3535 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3536 DIFF_PAIR_MODE_CHANGED(p) ||
3537 strcmp(one->path, two->path))
3538 return 0;
3539
3540 /* both are valid and point at the same path. that is, we are
3541 * dealing with a change.
3542 */
3543 if (one->sha1_valid && two->sha1_valid &&
85adbf2f
JL
3544 !hashcmp(one->sha1, two->sha1) &&
3545 !one->dirty_submodule && !two->dirty_submodule)
6973dcae
JH
3546 return 1; /* no change */
3547 if (!one->sha1_valid && !two->sha1_valid)
3548 return 1; /* both look at the same file on the filesystem. */
3549 return 0;
3550}
3551
3552static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3553{
3554 if (diff_unmodified_pair(p))
3555 return;
3556
3557 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3558 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3559 return; /* no tree diffs in patch format */
3560
3561 run_diff(p, o);
3562}
3563
3564static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3565 struct diffstat_t *diffstat)
3566{
3567 if (diff_unmodified_pair(p))
3568 return;
3569
3570 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3571 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
c3fced64 3572 return; /* no useful stat for tree diffs */
6973dcae
JH
3573
3574 run_diffstat(p, o, diffstat);
3575}
3576
88246898
JS
3577static void diff_flush_checkdiff(struct diff_filepair *p,
3578 struct diff_options *o)
3579{
3580 if (diff_unmodified_pair(p))
3581 return;
3582
3583 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3584 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
c3fced64 3585 return; /* nothing to check in tree diffs */
88246898
JS
3586
3587 run_checkdiff(p, o);
3588}
3589
6973dcae
JH
3590int diff_queue_is_empty(void)
3591{
3592 struct diff_queue_struct *q = &diff_queued_diff;
3593 int i;
3594 for (i = 0; i < q->nr; i++)
3595 if (!diff_unmodified_pair(q->queue[i]))
3596 return 0;
3597 return 1;
3598}
3599
3600#if DIFF_DEBUG
3601void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3602{
3603 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3604 x, one ? one : "",
3605 s->path,
3606 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3607 s->mode,
3608 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3609 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3610 x, one ? one : "",
3611 s->size, s->xfrm_flags);