The seventh batch of topics graduated to 'master'
[git/git.git] / diff.c
CommitLineData
6973dcae
JH
1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
6973dcae
JH
4#include "cache.h"
5#include "quote.h"
6#include "diff.h"
7#include "diffcore.h"
051308f6 8#include "delta.h"
6973dcae 9#include "xdiff-interface.h"
7c92fe0e 10#include "color.h"
8c701249 11#include "attr.h"
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;
df44483a 34static int diff_stat_graph_width;
712d2c7d 35static int diff_dirstat_permille_default = 30;
be4f2b40 36static struct diff_options default_diff_options;
6973dcae 37
7c92fe0e 38static char diff_colors[][COLOR_MAXLEN] = {
dc6ebd4c
AL
39 GIT_COLOR_RESET,
40 GIT_COLOR_NORMAL, /* PLAIN */
41 GIT_COLOR_BOLD, /* METAINFO */
42 GIT_COLOR_CYAN, /* FRAGINFO */
43 GIT_COLOR_RED, /* OLD */
44 GIT_COLOR_GREEN, /* NEW */
45 GIT_COLOR_YELLOW, /* COMMIT */
46 GIT_COLOR_BG_RED, /* WHITESPACE */
89cb73a1 47 GIT_COLOR_NORMAL, /* FUNCINFO */
cd112cef
JS
48};
49
801235c5
JH
50static int parse_diff_color_slot(const char *var, int ofs)
51{
52 if (!strcasecmp(var+ofs, "plain"))
53 return DIFF_PLAIN;
54 if (!strcasecmp(var+ofs, "meta"))
55 return DIFF_METAINFO;
56 if (!strcasecmp(var+ofs, "frag"))
57 return DIFF_FRAGINFO;
58 if (!strcasecmp(var+ofs, "old"))
59 return DIFF_FILE_OLD;
60 if (!strcasecmp(var+ofs, "new"))
61 return DIFF_FILE_NEW;
ce436973
JK
62 if (!strcasecmp(var+ofs, "commit"))
63 return DIFF_COMMIT;
448c3ef1
JH
64 if (!strcasecmp(var+ofs, "whitespace"))
65 return DIFF_WHITESPACE;
89cb73a1
BW
66 if (!strcasecmp(var+ofs, "func"))
67 return DIFF_FUNCINFO;
8b8e8624 68 return -1;
801235c5
JH
69}
70
51670fc8
JH
71static int parse_dirstat_params(struct diff_options *options, const char *params,
72 struct strbuf *errmsg)
333f3fb0
JH
73{
74 const char *p = params;
51670fc8
JH
75 int p_len, ret = 0;
76
333f3fb0 77 while (*p) {
51670fc8
JH
78 p_len = strchrnul(p, ',') - p;
79 if (!memcmp(p, "changes", p_len)) {
1c57a627
JH
80 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
81 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
51670fc8 82 } else if (!memcmp(p, "lines", p_len)) {
1c57a627 83 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
333f3fb0 84 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
51670fc8 85 } else if (!memcmp(p, "files", p_len)) {
1c57a627 86 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
333f3fb0 87 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
51670fc8 88 } else if (!memcmp(p, "noncumulative", p_len)) {
333f3fb0 89 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
51670fc8 90 } else if (!memcmp(p, "cumulative", p_len)) {
333f3fb0
JH
91 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
92 } else if (isdigit(*p)) {
93 char *end;
51670fc8
JH
94 int permille = strtoul(p, &end, 10) * 10;
95 if (*end == '.' && isdigit(*++end)) {
712d2c7d 96 /* only use first digit */
51670fc8 97 permille += *end - '0';
712d2c7d 98 /* .. and ignore any further digits */
51670fc8 99 while (isdigit(*++end))
712d2c7d
JH
100 ; /* nothing */
101 }
51670fc8
JH
102 if (end - p == p_len)
103 options->dirstat_permille = permille;
104 else {
7478ac57 105 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
51670fc8
JH
106 p_len, p);
107 ret++;
108 }
109 } else {
7478ac57 110 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
51670fc8
JH
111 p_len, p);
112 ret++;
333f3fb0 113 }
51670fc8
JH
114
115 p += p_len;
116
117 if (*p)
118 p++; /* more parameters, swallow separator */
333f3fb0 119 }
51670fc8 120 return ret;
333f3fb0
JH
121}
122
cced5fbc
LT
123static int git_config_rename(const char *var, const char *value)
124{
125 if (!value)
126 return DIFF_DETECT_RENAME;
127 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
128 return DIFF_DETECT_COPY;
129 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
130}
131
83ad63cf
JH
132/*
133 * These are to give UI layer defaults.
134 * The core-level commands such as git-diff-files should
135 * never be affected by the setting of diff.renames
136 * the user happens to have in the configuration file.
137 */
ef90d6d4 138int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 139{
a159ca0c 140 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
e269eb79 141 diff_use_color_default = git_config_colorbool(var, value);
801235c5
JH
142 return 0;
143 }
b68ea12e 144 if (!strcmp(var, "diff.renames")) {
cced5fbc 145 diff_detect_rename_default = git_config_rename(var, value);
b68ea12e
EW
146 return 0;
147 }
aecbf914
JH
148 if (!strcmp(var, "diff.autorefreshindex")) {
149 diff_auto_refresh_index = git_config_bool(var, value);
150 return 0;
151 }
a5a818ee
JH
152 if (!strcmp(var, "diff.mnemonicprefix")) {
153 diff_mnemonic_prefix = git_config_bool(var, value);
154 return 0;
155 }
f89504dd
EC
156 if (!strcmp(var, "diff.noprefix")) {
157 diff_no_prefix = git_config_bool(var, value);
158 return 0;
159 }
df44483a
ZJS
160 if (!strcmp(var, "diff.statgraphwidth")) {
161 diff_stat_graph_width = git_config_int(var, value);
162 return 0;
163 }
daec808c
BH
164 if (!strcmp(var, "diff.external"))
165 return git_config_string(&external_diff_cmd_cfg, var, value);
98a4d87b
BSSJ
166 if (!strcmp(var, "diff.wordregex"))
167 return git_config_string(&diff_word_regex_cfg, var, value);
f1af60bd 168
be4f2b40
JS
169 if (!strcmp(var, "diff.ignoresubmodules"))
170 handle_ignore_submodules_arg(&default_diff_options, value);
171
3e1dd17a
JK
172 if (git_color_config(var, value, cb) < 0)
173 return -1;
174
ef90d6d4 175 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
176}
177
ef90d6d4 178int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 179{
2b6ca6df
LT
180 if (!strcmp(var, "diff.renamelimit")) {
181 diff_rename_limit_default = git_config_int(var, value);
182 return 0;
183 }
184
6680a087
JK
185 if (userdiff_config(var, value) < 0)
186 return -1;
c7534ef4 187
1968d77d 188 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 189 int slot = parse_diff_color_slot(var, 11);
8b8e8624
JK
190 if (slot < 0)
191 return 0;
64f30e94
JH
192 if (!value)
193 return config_error_nonbool(var);
7c92fe0e 194 color_parse(value, var, diff_colors[slot]);
801235c5
JH
195 return 0;
196 }
f1af60bd 197
a624eaa7 198 /* like GNU diff's --suppress-blank-empty option */
950db879
JS
199 if (!strcmp(var, "diff.suppressblankempty") ||
200 /* for backwards compatibility */
201 !strcmp(var, "diff.suppress-blank-empty")) {
a624eaa7
JM
202 diff_suppress_blank_empty = git_config_bool(var, value);
203 return 0;
204 }
205
2d174951 206 if (!strcmp(var, "diff.dirstat")) {
51670fc8 207 struct strbuf errmsg = STRBUF_INIT;
712d2c7d 208 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
51670fc8 209 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
7478ac57 210 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
51670fc8
JH
211 errmsg.buf);
212 strbuf_release(&errmsg);
712d2c7d 213 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
2d174951
JH
214 return 0;
215 }
216
aee9c7d6
JL
217 if (!prefixcmp(var, "submodule."))
218 return parse_submodule_config_option(var, value);
219
3e1dd17a 220 return git_default_config(var, value, cb);
801235c5
JH
221}
222
6973dcae
JH
223static char *quote_two(const char *one, const char *two)
224{
225 int need_one = quote_c_style(one, NULL, NULL, 1);
226 int need_two = quote_c_style(two, NULL, NULL, 1);
f285a2d7 227 struct strbuf res = STRBUF_INIT;
6973dcae
JH
228
229 if (need_one + need_two) {
663af342
PH
230 strbuf_addch(&res, '"');
231 quote_c_style(one, &res, NULL, 1);
232 quote_c_style(two, &res, NULL, 1);
233 strbuf_addch(&res, '"');
234 } else {
235 strbuf_addstr(&res, one);
236 strbuf_addstr(&res, two);
6973dcae 237 }
b315c5c0 238 return strbuf_detach(&res, NULL);
6973dcae
JH
239}
240
241static const char *external_diff(void)
242{
243 static const char *external_diff_cmd = NULL;
244 static int done_preparing = 0;
245
246 if (done_preparing)
247 return external_diff_cmd;
248 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
cbe02100
JS
249 if (!external_diff_cmd)
250 external_diff_cmd = external_diff_cmd_cfg;
6973dcae
JH
251 done_preparing = 1;
252 return external_diff_cmd;
253}
254
6973dcae
JH
255static struct diff_tempfile {
256 const char *name; /* filename external diff should read from */
257 char hex[41];
258 char mode[10];
1472966c 259 char tmp_path[PATH_MAX];
6973dcae
JH
260} diff_temp[2];
261
6957eb9a
JH
262typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
263
264struct emit_callback {
6957eb9a
JH
265 int color_diff;
266 unsigned ws_rule;
267 int blank_at_eof_in_preimage;
268 int blank_at_eof_in_postimage;
269 int lno_in_preimage;
270 int lno_in_postimage;
271 sane_truncate_fn truncate;
272 const char **label_path;
273 struct diff_words_data *diff_words;
a3c158d4 274 struct diff_options *opt;
6957eb9a 275 int *found_changesp;
3e97c7c6 276 struct strbuf *header;
6957eb9a
JH
277};
278
6973dcae
JH
279static int count_lines(const char *data, int size)
280{
281 int count, ch, completely_empty = 1, nl_just_seen = 0;
282 count = 0;
283 while (0 < size--) {
284 ch = *data++;
285 if (ch == '\n') {
286 count++;
287 nl_just_seen = 1;
288 completely_empty = 0;
289 }
290 else {
291 nl_just_seen = 0;
292 completely_empty = 0;
293 }
294 }
295 if (completely_empty)
296 return 0;
297 if (!nl_just_seen)
298 count++; /* no trailing newline */
299 return count;
300}
301
6957eb9a
JH
302static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
303{
304 if (!DIFF_FILE_VALID(one)) {
305 mf->ptr = (char *)""; /* does not matter */
306 mf->size = 0;
307 return 0;
308 }
309 else if (diff_populate_filespec(one, 0))
310 return -1;
bb35fefb 311
6957eb9a
JH
312 mf->ptr = one->data;
313 mf->size = one->size;
314 return 0;
315}
316
abb371a1
JK
317/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
318static unsigned long diff_filespec_size(struct diff_filespec *one)
319{
320 if (!DIFF_FILE_VALID(one))
321 return 0;
322 diff_populate_filespec(one, 1);
323 return one->size;
324}
325
6957eb9a
JH
326static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
327{
328 char *ptr = mf->ptr;
329 long size = mf->size;
330 int cnt = 0;
331
332 if (!size)
333 return cnt;
334 ptr += size - 1; /* pointing at the very end */
335 if (*ptr != '\n')
336 ; /* incomplete line */
337 else
338 ptr--; /* skip the last LF */
339 while (mf->ptr < ptr) {
340 char *prev_eol;
341 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
342 if (*prev_eol == '\n')
343 break;
344 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
345 break;
346 cnt++;
347 ptr = prev_eol - 1;
348 }
349 return cnt;
350}
351
352static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
353 struct emit_callback *ecbdata)
354{
355 int l1, l2, at;
356 unsigned ws_rule = ecbdata->ws_rule;
357 l1 = count_trailing_blank(mf1, ws_rule);
358 l2 = count_trailing_blank(mf2, ws_rule);
359 if (l2 <= l1) {
360 ecbdata->blank_at_eof_in_preimage = 0;
361 ecbdata->blank_at_eof_in_postimage = 0;
362 return;
363 }
364 at = count_lines(mf1->ptr, mf1->size);
365 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
366
367 at = count_lines(mf2->ptr, mf2->size);
368 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
369}
370
a3c158d4 371static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
250f7993 372 int first, const char *line, int len)
6957eb9a
JH
373{
374 int has_trailing_newline, has_trailing_carriage_return;
250f7993 375 int nofirst;
a3c158d4
BY
376 FILE *file = o->file;
377
378 if (o->output_prefix) {
379 struct strbuf *msg = NULL;
380 msg = o->output_prefix(o, o->output_prefix_data);
381 assert(msg);
382 fwrite(msg->buf, msg->len, 1, file);
383 }
6957eb9a 384
250f7993
JH
385 if (len == 0) {
386 has_trailing_newline = (first == '\n');
387 has_trailing_carriage_return = (!has_trailing_newline &&
388 (first == '\r'));
389 nofirst = has_trailing_newline || has_trailing_carriage_return;
390 } else {
391 has_trailing_newline = (len > 0 && line[len-1] == '\n');
392 if (has_trailing_newline)
393 len--;
394 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
395 if (has_trailing_carriage_return)
396 len--;
397 nofirst = 0;
398 }
6957eb9a 399
06a47552
JH
400 if (len || !nofirst) {
401 fputs(set, file);
402 if (!nofirst)
403 fputc(first, file);
404 fwrite(line, len, 1, file);
405 fputs(reset, file);
406 }
6957eb9a
JH
407 if (has_trailing_carriage_return)
408 fputc('\r', file);
409 if (has_trailing_newline)
410 fputc('\n', file);
411}
412
a3c158d4 413static void emit_line(struct diff_options *o, const char *set, const char *reset,
250f7993
JH
414 const char *line, int len)
415{
a3c158d4 416 emit_line_0(o, set, reset, line[0], line+1, len-1);
250f7993
JH
417}
418
6957eb9a
JH
419static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
420{
421 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
422 ecbdata->blank_at_eof_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage &&
424 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
425 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
426 return 0;
018cff70 427 return ws_blank_line(line, len, ecbdata->ws_rule);
6957eb9a
JH
428}
429
018cff70
JH
430static void emit_add_line(const char *reset,
431 struct emit_callback *ecbdata,
432 const char *line, int len)
6957eb9a
JH
433{
434 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
435 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
436
437 if (!*ws)
a3c158d4 438 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
6957eb9a
JH
439 else if (new_blank_line_at_eof(ecbdata, line, len))
440 /* Blank line at EOF - paint '+' as well */
a3c158d4 441 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
6957eb9a
JH
442 else {
443 /* Emit just the prefix, then the rest. */
a3c158d4 444 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
018cff70 445 ws_check_emit(line, len, ecbdata->ws_rule,
a3c158d4 446 ecbdata->opt->file, set, reset, ws);
6957eb9a
JH
447 }
448}
449
89cb73a1
BW
450static void emit_hunk_header(struct emit_callback *ecbdata,
451 const char *line, int len)
452{
453 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
454 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
455 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
456 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
457 static const char atat[2] = { '@', '@' };
458 const char *cp, *ep;
2efcc977
BY
459 struct strbuf msgbuf = STRBUF_INIT;
460 int org_len = len;
461 int i = 1;
89cb73a1
BW
462
463 /*
464 * As a hunk header must begin with "@@ -<old>, +<new> @@",
465 * it always is at least 10 bytes long.
466 */
467 if (len < 10 ||
468 memcmp(line, atat, 2) ||
469 !(ep = memmem(line + 2, len - 2, atat, 2))) {
a3c158d4 470 emit_line(ecbdata->opt, plain, reset, line, len);
89cb73a1
BW
471 return;
472 }
473 ep += 2; /* skip over @@ */
474
475 /* The hunk header in fraginfo color */
2efcc977
BY
476 strbuf_add(&msgbuf, frag, strlen(frag));
477 strbuf_add(&msgbuf, line, ep - line);
478 strbuf_add(&msgbuf, reset, strlen(reset));
479
480 /*
481 * trailing "\r\n"
482 */
483 for ( ; i < 3; i++)
484 if (line[len - i] == '\r' || line[len - i] == '\n')
485 len--;
89cb73a1
BW
486
487 /* blank before the func header */
488 for (cp = ep; ep - line < len; ep++)
489 if (*ep != ' ' && *ep != '\t')
490 break;
2efcc977
BY
491 if (ep != cp) {
492 strbuf_add(&msgbuf, plain, strlen(plain));
493 strbuf_add(&msgbuf, cp, ep - cp);
494 strbuf_add(&msgbuf, reset, strlen(reset));
495 }
496
497 if (ep < line + len) {
498 strbuf_add(&msgbuf, func, strlen(func));
499 strbuf_add(&msgbuf, ep, line + len - ep);
500 strbuf_add(&msgbuf, reset, strlen(reset));
501 }
89cb73a1 502
2efcc977
BY
503 strbuf_add(&msgbuf, line + len, org_len - len);
504 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
505 strbuf_release(&msgbuf);
89cb73a1
BW
506}
507
479b0ae8
JK
508static struct diff_tempfile *claim_diff_tempfile(void) {
509 int i;
510 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
511 if (!diff_temp[i].name)
512 return diff_temp + i;
513 die("BUG: diff is failing to clean up its tempfiles");
514}
515
516static int remove_tempfile_installed;
517
518static void remove_tempfile(void)
519{
520 int i;
a8344abe
NR
521 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
522 if (diff_temp[i].name == diff_temp[i].tmp_path)
691f1a28 523 unlink_or_warn(diff_temp[i].name);
a8344abe
NR
524 diff_temp[i].name = NULL;
525 }
479b0ae8
JK
526}
527
528static void remove_tempfile_on_signal(int signo)
529{
530 remove_tempfile();
4a16d072 531 sigchain_pop(signo);
479b0ae8
JK
532 raise(signo);
533}
534
c0c77734 535static void print_line_count(FILE *file, int count)
6973dcae
JH
536{
537 switch (count) {
538 case 0:
c0c77734 539 fprintf(file, "0,0");
6973dcae
JH
540 break;
541 case 1:
c0c77734 542 fprintf(file, "1");
6973dcae
JH
543 break;
544 default:
c0c77734 545 fprintf(file, "1,%d", count);
6973dcae
JH
546 break;
547 }
548}
549
7f7ee2ff
JH
550static void emit_rewrite_lines(struct emit_callback *ecb,
551 int prefix, const char *data, int size)
6973dcae 552{
7f7ee2ff
JH
553 const char *endp = NULL;
554 static const char *nneof = " No newline at end of file\n";
555 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
556 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
557
558 while (0 < size) {
559 int len;
560
561 endp = memchr(data, '\n', size);
562 len = endp ? (endp - data + 1) : size;
563 if (prefix != '+') {
564 ecb->lno_in_preimage++;
a3c158d4 565 emit_line_0(ecb->opt, old, reset, '-',
7f7ee2ff
JH
566 data, len);
567 } else {
568 ecb->lno_in_postimage++;
569 emit_add_line(reset, ecb, data, len);
13e36ec5 570 }
7f7ee2ff
JH
571 size -= len;
572 data += len;
573 }
574 if (!endp) {
575 const char *plain = diff_get_color(ecb->color_diff,
576 DIFF_PLAIN);
a3c158d4 577 emit_line_0(ecb->opt, plain, reset, '\\',
7f7ee2ff 578 nneof, strlen(nneof));
6973dcae 579 }
6973dcae
JH
580}
581
582static void emit_rewrite_diff(const char *name_a,
583 const char *name_b,
584 struct diff_filespec *one,
13e36ec5 585 struct diff_filespec *two,
d9bae1a1
JK
586 struct userdiff_driver *textconv_one,
587 struct userdiff_driver *textconv_two,
eab9a40b 588 struct diff_options *o)
6973dcae
JH
589{
590 int lc_a, lc_b;
1a9eb3b9 591 const char *name_a_tab, *name_b_tab;
f1c96261
JK
592 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
593 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
594 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
d5625091 595 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
a5a818ee 596 const char *a_prefix, *b_prefix;
840383b2 597 char *data_one, *data_two;
3aa1f7ca 598 size_t size_one, size_two;
7f7ee2ff 599 struct emit_callback ecbdata;
7be57610
BY
600 char *line_prefix = "";
601 struct strbuf *msgbuf;
602
603 if (o && o->output_prefix) {
604 msgbuf = o->output_prefix(o, o->output_prefix_data);
605 line_prefix = msgbuf->buf;
606 }
a5a818ee
JH
607
608 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
609 a_prefix = o->b_prefix;
610 b_prefix = o->a_prefix;
611 } else {
612 a_prefix = o->a_prefix;
613 b_prefix = o->b_prefix;
614 }
1a9eb3b9 615
8a13becc
JH
616 name_a += (*name_a == '/');
617 name_b += (*name_b == '/');
1a9eb3b9
JH
618 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
619 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
620
d5625091
JH
621 strbuf_reset(&a_name);
622 strbuf_reset(&b_name);
a5a818ee
JH
623 quote_two_c_style(&a_name, a_prefix, name_a, 0);
624 quote_two_c_style(&b_name, b_prefix, name_b, 0);
d5625091 625
840383b2
JK
626 size_one = fill_textconv(textconv_one, one, &data_one);
627 size_two = fill_textconv(textconv_two, two, &data_two);
3aa1f7ca 628
d91ba8fa 629 memset(&ecbdata, 0, sizeof(ecbdata));
daa0c3d9 630 ecbdata.color_diff = want_color(o->use_color);
d91ba8fa
JH
631 ecbdata.found_changesp = &o->found_changes;
632 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
a3c158d4 633 ecbdata.opt = o;
d91ba8fa
JH
634 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
635 mmfile_t mf1, mf2;
636 mf1.ptr = (char *)data_one;
637 mf2.ptr = (char *)data_two;
638 mf1.size = size_one;
639 mf2.size = size_two;
640 check_blank_at_eof(&mf1, &mf2, &ecbdata);
641 }
642 ecbdata.lno_in_preimage = 1;
643 ecbdata.lno_in_postimage = 1;
644
3aa1f7ca
JK
645 lc_a = count_lines(data_one, size_one);
646 lc_b = count_lines(data_two, size_two);
c0c77734 647 fprintf(o->file,
7be57610
BY
648 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
649 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
650 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
651 line_prefix, fraginfo);
467ddc14
JH
652 if (!o->irreversible_delete)
653 print_line_count(o->file, lc_a);
654 else
655 fprintf(o->file, "?,?");
c0c77734
DB
656 fprintf(o->file, " +");
657 print_line_count(o->file, lc_b);
658 fprintf(o->file, " @@%s\n", reset);
467ddc14 659 if (lc_a && !o->irreversible_delete)
d91ba8fa 660 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
6973dcae 661 if (lc_b)
d91ba8fa 662 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
b76c056b 663 if (textconv_one)
aed6ca52 664 free((char *)data_one);
b76c056b 665 if (textconv_two)
aed6ca52 666 free((char *)data_two);
6973dcae
JH
667}
668
f59a59e2
JS
669struct diff_words_buffer {
670 mmfile_t text;
671 long alloc;
2e5d2003
JS
672 struct diff_words_orig {
673 const char *begin, *end;
674 } *orig;
675 int orig_nr, orig_alloc;
f59a59e2
JS
676};
677
678static void diff_words_append(char *line, unsigned long len,
679 struct diff_words_buffer *buffer)
680{
23c1575f 681 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
f59a59e2
JS
682 line++;
683 len--;
684 memcpy(buffer->text.ptr + buffer->text.size, line, len);
685 buffer->text.size += len;
2b6a5417 686 buffer->text.ptr[buffer->text.size] = '\0';
f59a59e2
JS
687}
688
9cba13ca 689struct diff_words_style_elem {
882749a0
TR
690 const char *prefix;
691 const char *suffix;
692 const char *color; /* NULL; filled in by the setup code if
693 * color is enabled */
694};
695
9cba13ca 696struct diff_words_style {
882749a0
TR
697 enum diff_words_type type;
698 struct diff_words_style_elem new, old, ctx;
699 const char *newline;
700};
701
c2e86add 702static struct diff_words_style diff_words_styles[] = {
882749a0
TR
703 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
704 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
705 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
706};
707
f59a59e2 708struct diff_words_data {
f59a59e2 709 struct diff_words_buffer minus, plus;
2e5d2003 710 const char *current_plus;
4297c0ae
BY
711 int last_minus;
712 struct diff_options *opt;
2b6a5417 713 regex_t *word_regex;
882749a0
TR
714 enum diff_words_type type;
715 struct diff_words_style *style;
f59a59e2
JS
716};
717
882749a0
TR
718static int fn_out_diff_words_write_helper(FILE *fp,
719 struct diff_words_style_elem *st_el,
720 const char *newline,
4297c0ae
BY
721 size_t count, const char *buf,
722 const char *line_prefix)
882749a0 723{
4297c0ae
BY
724 int print = 0;
725
882749a0
TR
726 while (count) {
727 char *p = memchr(buf, '\n', count);
4297c0ae
BY
728 if (print)
729 fputs(line_prefix, fp);
882749a0
TR
730 if (p != buf) {
731 if (st_el->color && fputs(st_el->color, fp) < 0)
732 return -1;
733 if (fputs(st_el->prefix, fp) < 0 ||
734 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
735 fputs(st_el->suffix, fp) < 0)
736 return -1;
737 if (st_el->color && *st_el->color
738 && fputs(GIT_COLOR_RESET, fp) < 0)
739 return -1;
740 }
741 if (!p)
742 return 0;
743 if (fputs(newline, fp) < 0)
744 return -1;
745 count -= p + 1 - buf;
746 buf = p + 1;
4297c0ae 747 print = 1;
882749a0
TR
748 }
749 return 0;
750}
751
4297c0ae
BY
752/*
753 * '--color-words' algorithm can be described as:
754 *
755 * 1. collect a the minus/plus lines of a diff hunk, divided into
756 * minus-lines and plus-lines;
757 *
758 * 2. break both minus-lines and plus-lines into words and
759 * place them into two mmfile_t with one word for each line;
760 *
761 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
762 *
763 * And for the common parts of the both file, we output the plus side text.
764 * diff_words->current_plus is used to trace the current position of the plus file
765 * which printed. diff_words->last_minus is used to trace the last minus word
766 * printed.
767 *
768 * For '--graph' to work with '--color-words', we need to output the graph prefix
769 * on each line of color words output. Generally, there are two conditions on
770 * which we should output the prefix.
771 *
772 * 1. diff_words->last_minus == 0 &&
773 * diff_words->current_plus == diff_words->plus.text.ptr
774 *
775 * that is: the plus text must start as a new line, and if there is no minus
776 * word printed, a graph prefix must be printed.
777 *
778 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
779 * *(diff_words->current_plus - 1) == '\n'
780 *
781 * that is: a graph prefix must be printed following a '\n'
782 */
783static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
784{
785 if ((diff_words->last_minus == 0 &&
786 diff_words->current_plus == diff_words->plus.text.ptr) ||
787 (diff_words->current_plus > diff_words->plus.text.ptr &&
788 *(diff_words->current_plus - 1) == '\n')) {
789 return 1;
790 } else {
791 return 0;
792 }
793}
794
f59a59e2 795static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
f59a59e2 796{
f59a59e2 797 struct diff_words_data *diff_words = priv;
882749a0 798 struct diff_words_style *style = diff_words->style;
2e5d2003
JS
799 int minus_first, minus_len, plus_first, plus_len;
800 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
4297c0ae
BY
801 struct diff_options *opt = diff_words->opt;
802 struct strbuf *msgbuf;
803 char *line_prefix = "";
f59a59e2 804
2e5d2003
JS
805 if (line[0] != '@' || parse_hunk_header(line, len,
806 &minus_first, &minus_len, &plus_first, &plus_len))
f59a59e2
JS
807 return;
808
4297c0ae
BY
809 assert(opt);
810 if (opt->output_prefix) {
811 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
812 line_prefix = msgbuf->buf;
813 }
814
2e5d2003
JS
815 /* POSIX requires that first be decremented by one if len == 0... */
816 if (minus_len) {
817 minus_begin = diff_words->minus.orig[minus_first].begin;
818 minus_end =
819 diff_words->minus.orig[minus_first + minus_len - 1].end;
820 } else
821 minus_begin = minus_end =
822 diff_words->minus.orig[minus_first].end;
823
824 if (plus_len) {
825 plus_begin = diff_words->plus.orig[plus_first].begin;
826 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
827 } else
828 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
829
4297c0ae
BY
830 if (color_words_output_graph_prefix(diff_words)) {
831 fputs(line_prefix, diff_words->opt->file);
832 }
833 if (diff_words->current_plus != plus_begin) {
834 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0
TR
835 &style->ctx, style->newline,
836 plus_begin - diff_words->current_plus,
4297c0ae
BY
837 diff_words->current_plus, line_prefix);
838 if (*(plus_begin - 1) == '\n')
839 fputs(line_prefix, diff_words->opt->file);
840 }
841 if (minus_begin != minus_end) {
842 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 843 &style->old, style->newline,
4297c0ae
BY
844 minus_end - minus_begin, minus_begin,
845 line_prefix);
846 }
847 if (plus_begin != plus_end) {
848 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 849 &style->new, style->newline,
4297c0ae
BY
850 plus_end - plus_begin, plus_begin,
851 line_prefix);
852 }
2e5d2003
JS
853
854 diff_words->current_plus = plus_end;
4297c0ae 855 diff_words->last_minus = minus_first;
f59a59e2
JS
856}
857
2b6a5417
JS
858/* This function starts looking at *begin, and returns 0 iff a word was found. */
859static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
860 int *begin, int *end)
861{
862 if (word_regex && *begin < buffer->size) {
863 regmatch_t match[1];
864 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
865 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
866 '\n', match[0].rm_eo - match[0].rm_so);
867 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
868 *begin += match[0].rm_so;
869 return *begin >= *end;
870 }
871 return -1;
f59a59e2
JS
872 }
873
2b6a5417
JS
874 /* find the next word */
875 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
876 (*begin)++;
877 if (*begin >= buffer->size)
878 return -1;
f59a59e2 879
2b6a5417
JS
880 /* find the end of the word */
881 *end = *begin + 1;
882 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
883 (*end)++;
884
885 return 0;
f59a59e2
JS
886}
887
23c1575f 888/*
2e5d2003
JS
889 * This function splits the words in buffer->text, stores the list with
890 * newline separator into out, and saves the offsets of the original words
891 * in buffer->orig.
23c1575f 892 */
2b6a5417
JS
893static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
894 regex_t *word_regex)
f59a59e2 895{
2e5d2003 896 int i, j;
2b6a5417 897 long alloc = 0;
f59a59e2 898
2e5d2003 899 out->size = 0;
2b6a5417 900 out->ptr = NULL;
f59a59e2 901
2e5d2003
JS
902 /* fake an empty "0th" word */
903 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
904 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
905 buffer->orig_nr = 1;
906
907 for (i = 0; i < buffer->text.size; i++) {
2b6a5417
JS
908 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
909 return;
2e5d2003
JS
910
911 /* store original boundaries */
912 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
913 buffer->orig_alloc);
914 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
915 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
916 buffer->orig_nr++;
917
918 /* store one word */
2b6a5417 919 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2e5d2003
JS
920 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
921 out->ptr[out->size + j - i] = '\n';
922 out->size += j - i + 1;
923
924 i = j - 1;
f59a59e2
JS
925 }
926}
927
928/* this executes the word diff on the accumulated buffers */
929static void diff_words_show(struct diff_words_data *diff_words)
930{
931 xpparam_t xpp;
932 xdemitconf_t xecfg;
f59a59e2 933 mmfile_t minus, plus;
882749a0 934 struct diff_words_style *style = diff_words->style;
f59a59e2 935
4297c0ae
BY
936 struct diff_options *opt = diff_words->opt;
937 struct strbuf *msgbuf;
938 char *line_prefix = "";
939
940 assert(opt);
941 if (opt->output_prefix) {
942 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
943 line_prefix = msgbuf->buf;
944 }
945
2e5d2003
JS
946 /* special case: only removal */
947 if (!diff_words->plus.text.size) {
4297c0ae
BY
948 fputs(line_prefix, diff_words->opt->file);
949 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 950 &style->old, style->newline,
4297c0ae
BY
951 diff_words->minus.text.size,
952 diff_words->minus.text.ptr, line_prefix);
2e5d2003
JS
953 diff_words->minus.text.size = 0;
954 return;
955 }
956
957 diff_words->current_plus = diff_words->plus.text.ptr;
4297c0ae 958 diff_words->last_minus = 0;
f59a59e2 959
9ccd0a88 960 memset(&xpp, 0, sizeof(xpp));
30b25010 961 memset(&xecfg, 0, sizeof(xecfg));
2b6a5417
JS
962 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
963 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
582aa00b 964 xpp.flags = 0;
2b6a5417 965 /* as only the hunk header will be parsed, we need a 0-context */
2e5d2003 966 xecfg.ctxlen = 0;
8a3f524b 967 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
dfea7900 968 &xpp, &xecfg);
f59a59e2
JS
969 free(minus.ptr);
970 free(plus.ptr);
2e5d2003 971 if (diff_words->current_plus != diff_words->plus.text.ptr +
4297c0ae
BY
972 diff_words->plus.text.size) {
973 if (color_words_output_graph_prefix(diff_words))
974 fputs(line_prefix, diff_words->opt->file);
975 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 976 &style->ctx, style->newline,
2e5d2003 977 diff_words->plus.text.ptr + diff_words->plus.text.size
4297c0ae
BY
978 - diff_words->current_plus, diff_words->current_plus,
979 line_prefix);
980 }
f59a59e2 981 diff_words->minus.text.size = diff_words->plus.text.size = 0;
f59a59e2
JS
982}
983
76fd2828
JH
984/* In "color-words" mode, show word-diff of words accumulated in the buffer */
985static void diff_words_flush(struct emit_callback *ecbdata)
986{
987 if (ecbdata->diff_words->minus.text.size ||
988 ecbdata->diff_words->plus.text.size)
989 diff_words_show(ecbdata->diff_words);
990}
991
77d1a520
TR
992static void diff_filespec_load_driver(struct diff_filespec *one)
993{
994 /* Use already-loaded driver */
995 if (one->driver)
996 return;
997
998 if (S_ISREG(one->mode))
999 one->driver = userdiff_find_by_path(one->path);
1000
1001 /* Fallback to default settings */
1002 if (!one->driver)
1003 one->driver = userdiff_find_by_name("default");
1004}
1005
1006static const char *userdiff_word_regex(struct diff_filespec *one)
1007{
1008 diff_filespec_load_driver(one);
1009 return one->driver->word_regex;
1010}
1011
1012static void init_diff_words_data(struct emit_callback *ecbdata,
6440d341 1013 struct diff_options *orig_opts,
77d1a520
TR
1014 struct diff_filespec *one,
1015 struct diff_filespec *two)
1016{
1017 int i;
6440d341
TR
1018 struct diff_options *o = xmalloc(sizeof(struct diff_options));
1019 memcpy(o, orig_opts, sizeof(struct diff_options));
77d1a520
TR
1020
1021 ecbdata->diff_words =
1022 xcalloc(1, sizeof(struct diff_words_data));
1023 ecbdata->diff_words->type = o->word_diff;
1024 ecbdata->diff_words->opt = o;
1025 if (!o->word_regex)
1026 o->word_regex = userdiff_word_regex(one);
1027 if (!o->word_regex)
1028 o->word_regex = userdiff_word_regex(two);
1029 if (!o->word_regex)
1030 o->word_regex = diff_word_regex_cfg;
1031 if (o->word_regex) {
1032 ecbdata->diff_words->word_regex = (regex_t *)
1033 xmalloc(sizeof(regex_t));
1034 if (regcomp(ecbdata->diff_words->word_regex,
1035 o->word_regex,
1036 REG_EXTENDED | REG_NEWLINE))
1037 die ("Invalid regular expression: %s",
1038 o->word_regex);
1039 }
1040 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1041 if (o->word_diff == diff_words_styles[i].type) {
1042 ecbdata->diff_words->style =
1043 &diff_words_styles[i];
1044 break;
1045 }
1046 }
1047 if (want_color(o->use_color)) {
1048 struct diff_words_style *st = ecbdata->diff_words->style;
1049 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1050 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1051 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1052 }
1053}
1054
f59a59e2
JS
1055static void free_diff_words_data(struct emit_callback *ecbdata)
1056{
1057 if (ecbdata->diff_words) {
76fd2828 1058 diff_words_flush(ecbdata);
6440d341 1059 free (ecbdata->diff_words->opt);
8e0f7003 1060 free (ecbdata->diff_words->minus.text.ptr);
2e5d2003 1061 free (ecbdata->diff_words->minus.orig);
8e0f7003 1062 free (ecbdata->diff_words->plus.text.ptr);
2e5d2003 1063 free (ecbdata->diff_words->plus.orig);
ef5644ea
BC
1064 if (ecbdata->diff_words->word_regex) {
1065 regfree(ecbdata->diff_words->word_regex);
1066 free(ecbdata->diff_words->word_regex);
1067 }
f59a59e2
JS
1068 free(ecbdata->diff_words);
1069 ecbdata->diff_words = NULL;
1070 }
1071}
1072
ce436973 1073const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef 1074{
daa0c3d9 1075 if (want_color(diff_use_color))
50f575fc
LT
1076 return diff_colors[ix];
1077 return "";
cd112cef
JS
1078}
1079
23707811
JH
1080static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1081{
1082 const char *cp;
1083 unsigned long allot;
1084 size_t l = len;
1085
1086 if (ecb->truncate)
1087 return ecb->truncate(line, len);
1088 cp = line;
1089 allot = l;
1090 while (0 < l) {
1091 (void) utf8_width(&cp, &l);
1092 if (!cp)
1093 break; /* truncated in the middle? */
1094 }
1095 return allot - l;
1096}
1097
d68fe26f 1098static void find_lno(const char *line, struct emit_callback *ecbdata)
690ed843 1099{
d68fe26f
JH
1100 const char *p;
1101 ecbdata->lno_in_preimage = 0;
1102 ecbdata->lno_in_postimage = 0;
1103 p = strchr(line, '-');
690ed843 1104 if (!p)
d68fe26f
JH
1105 return; /* cannot happen */
1106 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1107 p = strchr(p, '+');
1108 if (!p)
1109 return; /* cannot happen */
1110 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
690ed843
JH
1111}
1112
cd112cef 1113static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae 1114{
6973dcae 1115 struct emit_callback *ecbdata = priv;
472ca780
JK
1116 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1117 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 1118 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
7be57610
BY
1119 struct diff_options *o = ecbdata->opt;
1120 char *line_prefix = "";
1121 struct strbuf *msgbuf;
1122
1123 if (o && o->output_prefix) {
1124 msgbuf = o->output_prefix(o, o->output_prefix_data);
1125 line_prefix = msgbuf->buf;
1126 }
6973dcae 1127
3e97c7c6 1128 if (ecbdata->header) {
a3c158d4 1129 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
3e97c7c6
GB
1130 strbuf_reset(ecbdata->header);
1131 ecbdata->header = NULL;
1132 }
34a5e1a2
JS
1133 *(ecbdata->found_changesp) = 1;
1134
6973dcae 1135 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
1136 const char *name_a_tab, *name_b_tab;
1137
1138 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1139 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1140
7be57610
BY
1141 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1142 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1143 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1144 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
1145 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1146 }
cd112cef 1147
a624eaa7
JM
1148 if (diff_suppress_blank_empty
1149 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1150 line[0] = '\n';
1151 len = 1;
1152 }
1153
b8d9c1a6 1154 if (line[0] == '@') {
76fd2828
JH
1155 if (ecbdata->diff_words)
1156 diff_words_flush(ecbdata);
23707811 1157 len = sane_truncate_line(ecbdata, line, len);
d68fe26f 1158 find_lno(line, ecbdata);
89cb73a1 1159 emit_hunk_header(ecbdata, line, len);
23707811 1160 if (line[len-1] != '\n')
a3c158d4 1161 putc('\n', ecbdata->opt->file);
448c3ef1 1162 return;
cd112cef 1163 }
448c3ef1 1164
b8d9c1a6 1165 if (len < 1) {
a3c158d4 1166 emit_line(ecbdata->opt, reset, reset, line, len);
882749a0
TR
1167 if (ecbdata->diff_words
1168 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
a3c158d4 1169 fputs("~\n", ecbdata->opt->file);
448c3ef1 1170 return;
cd112cef 1171 }
448c3ef1 1172
448c3ef1
JH
1173 if (ecbdata->diff_words) {
1174 if (line[0] == '-') {
1175 diff_words_append(line, len,
1176 &ecbdata->diff_words->minus);
1177 return;
1178 } else if (line[0] == '+') {
1179 diff_words_append(line, len,
1180 &ecbdata->diff_words->plus);
1181 return;
c7c2bc0a
TR
1182 } else if (!prefixcmp(line, "\\ ")) {
1183 /*
1184 * Eat the "no newline at eof" marker as if we
1185 * saw a "+" or "-" line with nothing on it,
1186 * and return without diff_words_flush() to
1187 * defer processing. If this is the end of
1188 * preimage, more "+" lines may come after it.
1189 */
1190 return;
448c3ef1 1191 }
76fd2828 1192 diff_words_flush(ecbdata);
882749a0 1193 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
a3c158d4
BY
1194 emit_line(ecbdata->opt, plain, reset, line, len);
1195 fputs("~\n", ecbdata->opt->file);
882749a0 1196 } else {
42536dd9
JM
1197 /*
1198 * Skip the prefix character, if any. With
1199 * diff_suppress_blank_empty, there may be
1200 * none.
1201 */
1202 if (line[0] != '\n') {
1203 line++;
1204 len--;
1205 }
1206 emit_line(ecbdata->opt, plain, reset, line, len);
882749a0 1207 }
448c3ef1
JH
1208 return;
1209 }
448c3ef1 1210
690ed843
JH
1211 if (line[0] != '+') {
1212 const char *color =
1213 diff_get_color(ecbdata->color_diff,
1214 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1215 ecbdata->lno_in_preimage++;
d68fe26f
JH
1216 if (line[0] == ' ')
1217 ecbdata->lno_in_postimage++;
a3c158d4 1218 emit_line(ecbdata->opt, color, reset, line, len);
d68fe26f
JH
1219 } else {
1220 ecbdata->lno_in_postimage++;
018cff70 1221 emit_add_line(reset, ecbdata, line + 1, len - 1);
448c3ef1 1222 }
6973dcae
JH
1223}
1224
1225static char *pprint_rename(const char *a, const char *b)
1226{
1227 const char *old = a;
1228 const char *new = b;
f285a2d7 1229 struct strbuf name = STRBUF_INIT;
6973dcae
JH
1230 int pfx_length, sfx_length;
1231 int len_a = strlen(a);
1232 int len_b = strlen(b);
663af342 1233 int a_midlen, b_midlen;
e5bfbf9b
AJ
1234 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1235 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1236
1237 if (qlen_a || qlen_b) {
663af342
PH
1238 quote_c_style(a, &name, NULL, 0);
1239 strbuf_addstr(&name, " => ");
1240 quote_c_style(b, &name, NULL, 0);
b315c5c0 1241 return strbuf_detach(&name, NULL);
e5bfbf9b 1242 }
6973dcae
JH
1243
1244 /* Find common prefix */
1245 pfx_length = 0;
1246 while (*old && *new && *old == *new) {
1247 if (*old == '/')
1248 pfx_length = old - a + 1;
1249 old++;
1250 new++;
1251 }
1252
1253 /* Find common suffix */
1254 old = a + len_a;
1255 new = b + len_b;
1256 sfx_length = 0;
1257 while (a <= old && b <= new && *old == *new) {
1258 if (*old == '/')
1259 sfx_length = len_a - (old - a);
1260 old--;
1261 new--;
1262 }
1263
1264 /*
1265 * pfx{mid-a => mid-b}sfx
1266 * {pfx-a => pfx-b}sfx
1267 * pfx{sfx-a => sfx-b}
1268 * name-a => name-b
1269 */
663af342
PH
1270 a_midlen = len_a - pfx_length - sfx_length;
1271 b_midlen = len_b - pfx_length - sfx_length;
1272 if (a_midlen < 0)
1273 a_midlen = 0;
1274 if (b_midlen < 0)
1275 b_midlen = 0;
1276
1277 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 1278 if (pfx_length + sfx_length) {
663af342
PH
1279 strbuf_add(&name, a, pfx_length);
1280 strbuf_addch(&name, '{');
6973dcae 1281 }
663af342
PH
1282 strbuf_add(&name, a + pfx_length, a_midlen);
1283 strbuf_addstr(&name, " => ");
1284 strbuf_add(&name, b + pfx_length, b_midlen);
1285 if (pfx_length + sfx_length) {
1286 strbuf_addch(&name, '}');
1287 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 1288 }
b315c5c0 1289 return strbuf_detach(&name, NULL);
6973dcae
JH
1290}
1291
1292struct diffstat_t {
6973dcae
JH
1293 int nr;
1294 int alloc;
1295 struct diffstat_file {
f604652e 1296 char *from_name;
6973dcae 1297 char *name;
f604652e 1298 char *print_name;
6973dcae
JH
1299 unsigned is_unmerged:1;
1300 unsigned is_binary:1;
1301 unsigned is_renamed:1;
0974c117 1302 uintmax_t added, deleted;
6973dcae
JH
1303 } **files;
1304};
1305
1306static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1307 const char *name_a,
1308 const char *name_b)
1309{
1310 struct diffstat_file *x;
1311 x = xcalloc(sizeof (*x), 1);
1312 if (diffstat->nr == diffstat->alloc) {
1313 diffstat->alloc = alloc_nr(diffstat->alloc);
1314 diffstat->files = xrealloc(diffstat->files,
1315 diffstat->alloc * sizeof(x));
1316 }
1317 diffstat->files[diffstat->nr++] = x;
1318 if (name_b) {
f604652e
JH
1319 x->from_name = xstrdup(name_a);
1320 x->name = xstrdup(name_b);
6973dcae
JH
1321 x->is_renamed = 1;
1322 }
f604652e
JH
1323 else {
1324 x->from_name = NULL;
9befac47 1325 x->name = xstrdup(name_a);
f604652e 1326 }
6973dcae
JH
1327 return x;
1328}
1329
1330static void diffstat_consume(void *priv, char *line, unsigned long len)
1331{
1332 struct diffstat_t *diffstat = priv;
1333 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1334
1335 if (line[0] == '+')
1336 x->added++;
1337 else if (line[0] == '-')
1338 x->deleted++;
1339}
1340
698ce6f8 1341const char mime_boundary_leader[] = "------------";
6973dcae 1342
a2540023
JH
1343static int scale_linear(int it, int width, int max_change)
1344{
2eeeef24
JH
1345 if (!it)
1346 return 0;
a2540023 1347 /*
2eeeef24
JH
1348 * make sure that at least one '-' or '+' is printed if
1349 * there is any change to this path. The easiest way is to
1350 * scale linearly as if the alloted width is one column shorter
1351 * than it is, and then add 1 to the result.
a2540023 1352 */
2eeeef24 1353 return 1 + (it * (width - 1) / max_change);
a2540023
JH
1354}
1355
c0c77734 1356static void show_name(FILE *file,
a408e0e6 1357 const char *prefix, const char *name, int len)
a2540023 1358{
a408e0e6 1359 fprintf(file, " %s%-*s |", prefix, len, name);
a2540023
JH
1360}
1361
c0c77734 1362static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
1363{
1364 if (cnt <= 0)
1365 return;
c0c77734 1366 fprintf(file, "%s", set);
a2540023 1367 while (cnt--)
c0c77734
DB
1368 putc(ch, file);
1369 fprintf(file, "%s", reset);
a2540023
JH
1370}
1371
f604652e
JH
1372static void fill_print_name(struct diffstat_file *file)
1373{
1374 char *pname;
1375
1376 if (file->print_name)
1377 return;
1378
1379 if (!file->is_renamed) {
f285a2d7 1380 struct strbuf buf = STRBUF_INIT;
f604652e
JH
1381 if (quote_c_style(file->name, &buf, NULL, 0)) {
1382 pname = strbuf_detach(&buf, NULL);
1383 } else {
1384 pname = file->name;
1385 strbuf_release(&buf);
1386 }
1387 } else {
1388 pname = pprint_rename(file->from_name, file->name);
1389 }
1390 file->print_name = pname;
1391}
1392
7f814632
NTND
1393int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1394{
1395 struct strbuf sb = STRBUF_INIT;
1396 int ret;
1397
1398 if (!files) {
1399 assert(insertions == 0 && deletions == 0);
1400 return fputs(_(" 0 files changed\n"), fp);
1401 }
1402
1403 strbuf_addf(&sb,
1404 Q_(" %d file changed", " %d files changed", files),
1405 files);
1406
1407 /*
1408 * For binary diff, the caller may want to print "x files
1409 * changed" with insertions == 0 && deletions == 0.
1410 *
1411 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1412 * is probably less confusing (i.e skip over "2 files changed
1413 * but nothing about added/removed lines? Is this a bug in Git?").
1414 */
1415 if (insertions || deletions == 0) {
1416 /*
1417 * TRANSLATORS: "+" in (+) is a line addition marker;
1418 * do not translate it.
1419 */
1420 strbuf_addf(&sb,
1421 Q_(", %d insertion(+)", ", %d insertions(+)",
1422 insertions),
1423 insertions);
1424 }
1425
1426 if (deletions || insertions == 0) {
1427 /*
1428 * TRANSLATORS: "-" in (-) is a line removal marker;
1429 * do not translate it.
1430 */
1431 strbuf_addf(&sb,
1432 Q_(", %d deletion(-)", ", %d deletions(-)",
1433 deletions),
1434 deletions);
1435 }
1436 strbuf_addch(&sb, '\n');
1437 ret = fputs(sb.buf, fp);
1438 strbuf_release(&sb);
1439 return ret;
1440}
1441
4b25d091 1442static void show_stats(struct diffstat_t *data, struct diff_options *options)
6973dcae 1443{
eb3a9dd3 1444 int i, len, add, del, adds = 0, dels = 0;
0974c117 1445 uintmax_t max_change = 0, max_len = 0;
6973dcae 1446 int total_files = data->nr;
1b058bc3 1447 int width, name_width, graph_width, number_width = 4, count;
c0aa335c 1448 const char *reset, *add_c, *del_c;
7be57610 1449 const char *line_prefix = "";
e5f85df8 1450 int extra_shown = 0;
7be57610 1451 struct strbuf *msg = NULL;
6973dcae
JH
1452
1453 if (data->nr == 0)
1454 return;
1455
7be57610
BY
1456 if (options->output_prefix) {
1457 msg = options->output_prefix(options, options->output_prefix_data);
1458 line_prefix = msg->buf;
1459 }
1460
808e1db2 1461 count = options->stat_count ? options->stat_count : data->nr;
a2540023 1462
8f67f8ae 1463 reset = diff_get_color_opt(options, DIFF_RESET);
8f67f8ae
PH
1464 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1465 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 1466
1b058bc3
ZJS
1467 /*
1468 * Find the longest filename and max number of changes
1469 */
808e1db2 1470 for (i = 0; (i < count) && (i < data->nr); i++) {
6973dcae 1471 struct diffstat_file *file = data->files[i];
0974c117 1472 uintmax_t change = file->added + file->deleted;
358e460e
MG
1473 if (!data->files[i]->is_renamed &&
1474 (change == 0)) {
808e1db2 1475 count++; /* not shown == room for one more */
358e460e
MG
1476 continue;
1477 }
f604652e
JH
1478 fill_print_name(file);
1479 len = strlen(file->print_name);
6973dcae
JH
1480 if (max_len < len)
1481 max_len = len;
1482
1483 if (file->is_binary || file->is_unmerged)
1484 continue;
a2540023
JH
1485 if (max_change < change)
1486 max_change = change;
6973dcae 1487 }
808e1db2 1488 count = i; /* min(count, data->nr) */
6973dcae 1489
1b058bc3
ZJS
1490 /*
1491 * We have width = stat_width or term_columns() columns total.
1492 * We want a maximum of min(max_len, stat_name_width) for the name part.
969fe57b 1493 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1b058bc3
ZJS
1494 * We also need 1 for " " and 4 + decimal_width(max_change)
1495 * for " | NNNN " and one the empty column at the end, altogether
1496 * 6 + decimal_width(max_change).
1497 *
1498 * If there's not enough space, we will use the smaller of
1499 * stat_name_width (if set) and 5/8*width for the filename,
969fe57b
ZJS
1500 * and the rest for constant elements + graph part, but no more
1501 * than stat_graph_width for the graph part.
1b058bc3
ZJS
1502 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1503 * for the standard terminal size).
a2540023 1504 *
1b058bc3
ZJS
1505 * In other words: stat_width limits the maximum width, and
1506 * stat_name_width fixes the maximum width of the filename,
1507 * and is also used to divide available columns if there
1508 * aren't enough.
a2540023 1509 */
1b058bc3
ZJS
1510
1511 if (options->stat_width == -1)
1512 width = term_columns();
a2540023 1513 else
1b058bc3 1514 width = options->stat_width ? options->stat_width : 80;
a2540023 1515
df44483a
ZJS
1516 if (options->stat_graph_width == -1)
1517 options->stat_graph_width = diff_stat_graph_width;
a2540023 1518
1b058bc3
ZJS
1519 /*
1520 * Guarantee 3/8*16==6 for the graph part
1521 * and 5/8*16==10 for the filename part
1522 */
1523 if (width < 16 + 6 + number_width)
1524 width = 16 + 6 + number_width;
1525
1526 /*
1527 * First assign sizes that are wanted, ignoring available width.
1528 */
969fe57b
ZJS
1529 graph_width = (options->stat_graph_width &&
1530 options->stat_graph_width < max_change) ?
1531 options->stat_graph_width : max_change;
1b058bc3
ZJS
1532 name_width = (options->stat_name_width > 0 &&
1533 options->stat_name_width < max_len) ?
1534 options->stat_name_width : max_len;
1535
1536 /*
1537 * Adjust adjustable widths not to exceed maximum width
1538 */
1539 if (name_width + number_width + 6 + graph_width > width) {
1540 if (graph_width > width * 3/8 - number_width - 6)
1541 graph_width = width * 3/8 - number_width - 6;
969fe57b
ZJS
1542 if (options->stat_graph_width &&
1543 graph_width > options->stat_graph_width)
1544 graph_width = options->stat_graph_width;
1b058bc3
ZJS
1545 if (name_width > width - number_width - 6 - graph_width)
1546 name_width = width - number_width - 6 - graph_width;
1547 else
1548 graph_width = width - number_width - 6 - name_width;
1549 }
1550
1551 /*
1552 * From here name_width is the width of the name area,
1553 * and graph_width is the width of the graph area.
1554 * max_change is used to scale graph properly.
1555 */
808e1db2 1556 for (i = 0; i < count; i++) {
d2543b8e 1557 const char *prefix = "";
f604652e 1558 char *name = data->files[i]->print_name;
0974c117
JK
1559 uintmax_t added = data->files[i]->added;
1560 uintmax_t deleted = data->files[i]->deleted;
a2540023 1561 int name_len;
6973dcae 1562
358e460e
MG
1563 if (!data->files[i]->is_renamed &&
1564 (added + deleted == 0)) {
1565 total_files--;
1566 continue;
1567 }
6973dcae
JH
1568 /*
1569 * "scale" the filename
1570 */
a2540023
JH
1571 len = name_width;
1572 name_len = strlen(name);
1573 if (name_width < name_len) {
6973dcae
JH
1574 char *slash;
1575 prefix = "...";
a2540023
JH
1576 len -= 3;
1577 name += name_len - len;
6973dcae
JH
1578 slash = strchr(name, '/');
1579 if (slash)
1580 name = slash;
1581 }
6973dcae
JH
1582
1583 if (data->files[i]->is_binary) {
7be57610 1584 fprintf(options->file, "%s", line_prefix);
a408e0e6 1585 show_name(options->file, prefix, name, len);
c0c77734 1586 fprintf(options->file, " Bin ");
0974c117
JK
1587 fprintf(options->file, "%s%"PRIuMAX"%s",
1588 del_c, deleted, reset);
c0c77734 1589 fprintf(options->file, " -> ");
0974c117
JK
1590 fprintf(options->file, "%s%"PRIuMAX"%s",
1591 add_c, added, reset);
c0c77734
DB
1592 fprintf(options->file, " bytes");
1593 fprintf(options->file, "\n");
f604652e 1594 continue;
6973dcae
JH
1595 }
1596 else if (data->files[i]->is_unmerged) {
7be57610 1597 fprintf(options->file, "%s", line_prefix);
a408e0e6 1598 show_name(options->file, prefix, name, len);
c0c77734 1599 fprintf(options->file, " Unmerged\n");
f604652e 1600 continue;
6973dcae 1601 }
6973dcae 1602
a2540023
JH
1603 /*
1604 * scale the add/delete
1605 */
6973dcae
JH
1606 add = added;
1607 del = deleted;
6973dcae
JH
1608 adds += add;
1609 dels += del;
1610
1b058bc3 1611 if (graph_width <= max_change) {
2eeeef24
JH
1612 int total = add + del;
1613
1b058bc3 1614 total = scale_linear(add + del, graph_width, max_change);
2eeeef24
JH
1615 if (total < 2 && add && del)
1616 /* width >= 2 due to the sanity check */
1617 total = 2;
1618 if (add < del) {
1b058bc3 1619 add = scale_linear(add, graph_width, max_change);
2eeeef24
JH
1620 del = total - add;
1621 } else {
1b058bc3 1622 del = scale_linear(del, graph_width, max_change);
2eeeef24
JH
1623 add = total - del;
1624 }
6973dcae 1625 }
7be57610 1626 fprintf(options->file, "%s", line_prefix);
a408e0e6 1627 show_name(options->file, prefix, name, len);
0974c117 1628 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
4d9b5359 1629 added + deleted ? " " : "");
c0c77734
DB
1630 show_graph(options->file, '+', add, add_c, reset);
1631 show_graph(options->file, '-', del, del_c, reset);
1632 fprintf(options->file, "\n");
1633 }
808e1db2
MG
1634 for (i = count; i < data->nr; i++) {
1635 uintmax_t added = data->files[i]->added;
1636 uintmax_t deleted = data->files[i]->deleted;
1637 if (!data->files[i]->is_renamed &&
1638 (added + deleted == 0)) {
1639 total_files--;
1640 continue;
1641 }
1642 adds += added;
1643 dels += deleted;
e5f85df8
JH
1644 if (!extra_shown)
1645 fprintf(options->file, "%s ...\n", line_prefix);
1646 extra_shown = 1;
808e1db2 1647 }
7be57610 1648 fprintf(options->file, "%s", line_prefix);
7f814632 1649 print_stat_summary(options->file, total_files, adds, dels);
6973dcae
JH
1650}
1651
2775d92c 1652static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
ebd124c6
NP
1653{
1654 int i, adds = 0, dels = 0, total_files = data->nr;
1655
1656 if (data->nr == 0)
1657 return;
1658
1659 for (i = 0; i < data->nr; i++) {
1660 if (!data->files[i]->is_binary &&
1661 !data->files[i]->is_unmerged) {
1662 int added = data->files[i]->added;
1663 int deleted= data->files[i]->deleted;
1664 if (!data->files[i]->is_renamed &&
1665 (added + deleted == 0)) {
1666 total_files--;
1667 } else {
1668 adds += added;
1669 dels += deleted;
1670 }
1671 }
ebd124c6 1672 }
7be57610
BY
1673 if (options->output_prefix) {
1674 struct strbuf *msg = NULL;
1675 msg = options->output_prefix(options,
1676 options->output_prefix_data);
1677 fprintf(options->file, "%s", msg->buf);
1678 }
7f814632 1679 print_stat_summary(options->file, total_files, adds, dels);
ebd124c6
NP
1680}
1681
4b25d091 1682static void show_numstat(struct diffstat_t *data, struct diff_options *options)
74e2abe5
JH
1683{
1684 int i;
1685
f604652e
JH
1686 if (data->nr == 0)
1687 return;
1688
74e2abe5
JH
1689 for (i = 0; i < data->nr; i++) {
1690 struct diffstat_file *file = data->files[i];
1691
7be57610
BY
1692 if (options->output_prefix) {
1693 struct strbuf *msg = NULL;
1694 msg = options->output_prefix(options,
1695 options->output_prefix_data);
1696 fprintf(options->file, "%s", msg->buf);
1697 }
1698
bfddbc5e 1699 if (file->is_binary)
c0c77734 1700 fprintf(options->file, "-\t-\t");
bfddbc5e 1701 else
c0c77734 1702 fprintf(options->file,
0974c117
JK
1703 "%"PRIuMAX"\t%"PRIuMAX"\t",
1704 file->added, file->deleted);
f604652e
JH
1705 if (options->line_termination) {
1706 fill_print_name(file);
1707 if (!file->is_renamed)
c0c77734 1708 write_name_quoted(file->name, options->file,
f604652e
JH
1709 options->line_termination);
1710 else {
c0c77734
DB
1711 fputs(file->print_name, options->file);
1712 putc(options->line_termination, options->file);
f604652e 1713 }
663af342 1714 } else {
f604652e 1715 if (file->is_renamed) {
c0c77734
DB
1716 putc('\0', options->file);
1717 write_name_quoted(file->from_name, options->file, '\0');
f604652e 1718 }
c0c77734 1719 write_name_quoted(file->name, options->file, '\0');
663af342 1720 }
74e2abe5
JH
1721 }
1722}
1723
c04a7155
JH
1724struct dirstat_file {
1725 const char *name;
1726 unsigned long changed;
7df7c019
LT
1727};
1728
c04a7155
JH
1729struct dirstat_dir {
1730 struct dirstat_file *files;
712d2c7d 1731 int alloc, nr, permille, cumulative;
c04a7155
JH
1732};
1733
7be57610
BY
1734static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1735 unsigned long changed, const char *base, int baselen)
7df7c019
LT
1736{
1737 unsigned long this_dir = 0;
1738 unsigned int sources = 0;
7be57610
BY
1739 const char *line_prefix = "";
1740 struct strbuf *msg = NULL;
1741
1742 if (opt->output_prefix) {
1743 msg = opt->output_prefix(opt, opt->output_prefix_data);
1744 line_prefix = msg->buf;
1745 }
7df7c019
LT
1746
1747 while (dir->nr) {
c04a7155 1748 struct dirstat_file *f = dir->files;
7df7c019
LT
1749 int namelen = strlen(f->name);
1750 unsigned long this;
1751 char *slash;
1752
1753 if (namelen < baselen)
1754 break;
1755 if (memcmp(f->name, base, baselen))
1756 break;
1757 slash = strchr(f->name + baselen, '/');
1758 if (slash) {
1759 int newbaselen = slash + 1 - f->name;
7be57610 1760 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
7df7c019
LT
1761 sources++;
1762 } else {
c04a7155 1763 this = f->changed;
7df7c019
LT
1764 dir->files++;
1765 dir->nr--;
1766 sources += 2;
1767 }
1768 this_dir += this;
1769 }
1770
1771 /*
1772 * We don't report dirstat's for
1773 * - the top level
1774 * - or cases where everything came from a single directory
1775 * under this directory (sources == 1).
1776 */
1777 if (baselen && sources != 1) {
58a8756a
JH
1778 if (this_dir) {
1779 int permille = this_dir * 1000 / changed;
712d2c7d 1780 if (permille >= dir->permille) {
7be57610 1781 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
712d2c7d 1782 permille / 10, permille % 10, baselen, base);
7df7c019
LT
1783 if (!dir->cumulative)
1784 return 0;
1785 }
1786 }
1787 }
1788 return this_dir;
1789}
1790
441bca0b
LT
1791static int dirstat_compare(const void *_a, const void *_b)
1792{
1793 const struct dirstat_file *a = _a;
1794 const struct dirstat_file *b = _b;
1795 return strcmp(a->name, b->name);
1796}
1797
c04a7155 1798static void show_dirstat(struct diff_options *options)
7df7c019
LT
1799{
1800 int i;
1801 unsigned long changed;
c04a7155
JH
1802 struct dirstat_dir dir;
1803 struct diff_queue_struct *q = &diff_queued_diff;
1804
1805 dir.files = NULL;
1806 dir.alloc = 0;
1807 dir.nr = 0;
712d2c7d 1808 dir.permille = options->dirstat_permille;
f88d225f 1809 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
7df7c019 1810
7df7c019 1811 changed = 0;
c04a7155
JH
1812 for (i = 0; i < q->nr; i++) {
1813 struct diff_filepair *p = q->queue[i];
1814 const char *name;
1815 unsigned long copied, added, damage;
0133dab7 1816 int content_changed;
c04a7155 1817
2ca86714 1818 name = p->two->path ? p->two->path : p->one->path;
c04a7155 1819
0133dab7
JH
1820 if (p->one->sha1_valid && p->two->sha1_valid)
1821 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1822 else
1823 content_changed = 1;
1824
2ff3a803
JH
1825 if (!content_changed) {
1826 /*
1827 * The SHA1 has not changed, so pre-/post-content is
1828 * identical. We can therefore skip looking at the
1829 * file contents altogether.
1830 */
1831 damage = 0;
1832 goto found_damage;
1833 }
1834
0133dab7
JH
1835 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1836 /*
1837 * In --dirstat-by-file mode, we don't really need to
1838 * look at the actual file contents at all.
1839 * The fact that the SHA1 changed is enough for us to
1840 * add this file to the list of results
1841 * (with each file contributing equal damage).
1842 */
2ff3a803 1843 damage = 1;
0133dab7
JH
1844 goto found_damage;
1845 }
c04a7155
JH
1846
1847 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1848 diff_populate_filespec(p->one, 0);
1849 diff_populate_filespec(p->two, 0);
1850 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1851 &copied, &added);
1852 diff_free_filespec_data(p->one);
1853 diff_free_filespec_data(p->two);
1854 } else if (DIFF_FILE_VALID(p->one)) {
1855 diff_populate_filespec(p->one, 1);
1856 copied = added = 0;
1857 diff_free_filespec_data(p->one);
1858 } else if (DIFF_FILE_VALID(p->two)) {
1859 diff_populate_filespec(p->two, 1);
1860 copied = 0;
1861 added = p->two->size;
1862 diff_free_filespec_data(p->two);
1863 } else
2b0b551d 1864 continue;
c04a7155
JH
1865
1866 /*
1867 * Original minus copied is the removed material,
1868 * added is the new material. They are both damages
0133dab7 1869 * made to the preimage.
2ff3a803
JH
1870 * If the resulting damage is zero, we know that
1871 * diffcore_count_changes() considers the two entries to
1872 * be identical, but since content_changed is true, we
1873 * know that there must have been _some_ kind of change,
1874 * so we force all entries to have damage > 0.
c04a7155
JH
1875 */
1876 damage = (p->one->size - copied) + added;
2ff3a803 1877 if (!damage)
fd33777b 1878 damage = 1;
c04a7155 1879
0133dab7 1880found_damage:
c04a7155
JH
1881 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1882 dir.files[dir.nr].name = name;
1883 dir.files[dir.nr].changed = damage;
1884 changed += damage;
1885 dir.nr++;
7df7c019
LT
1886 }
1887
1888 /* This can happen even with many files, if everything was renames */
1889 if (!changed)
1890 return;
1891
1892 /* Show all directories with more than x% of the changes */
441bca0b 1893 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
7be57610 1894 gather_dirstat(options, &dir, changed, "", 0);
7df7c019
LT
1895}
1896
1c57a627
JH
1897static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1898{
1899 int i;
1900 unsigned long changed;
1901 struct dirstat_dir dir;
1902
1903 if (data->nr == 0)
1904 return;
1905
1906 dir.files = NULL;
1907 dir.alloc = 0;
1908 dir.nr = 0;
1909 dir.permille = options->dirstat_permille;
1910 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1911
1912 changed = 0;
1913 for (i = 0; i < data->nr; i++) {
1914 struct diffstat_file *file = data->files[i];
1915 unsigned long damage = file->added + file->deleted;
1916 if (file->is_binary)
1917 /*
1918 * binary files counts bytes, not lines. Must find some
1919 * way to normalize binary bytes vs. textual lines.
1920 * The following heuristic assumes that there are 64
1921 * bytes per "line".
1922 * This is stupid and ugly, but very cheap...
1923 */
1924 damage = (damage + 63) / 64;
1925 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1926 dir.files[dir.nr].name = file->name;
1927 dir.files[dir.nr].changed = damage;
1928 changed += damage;
1929 dir.nr++;
1930 }
1931
1932 /* This can happen even with many files, if everything was renames */
1933 if (!changed)
1934 return;
1935
1936 /* Show all directories with more than x% of the changes */
1937 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1938 gather_dirstat(options, &dir, changed, "", 0);
1939}
1940
f604652e
JH
1941static void free_diffstat_info(struct diffstat_t *diffstat)
1942{
1943 int i;
1944 for (i = 0; i < diffstat->nr; i++) {
1945 struct diffstat_file *f = diffstat->files[i];
1946 if (f->name != f->print_name)
1947 free(f->print_name);
1948 free(f->name);
1949 free(f->from_name);
1950 free(f);
1951 }
1952 free(diffstat->files);
1953}
1954
88246898 1955struct checkdiff_t {
88246898 1956 const char *filename;
1ba111d1 1957 int lineno;
a757c646 1958 int conflict_marker_size;
1ba111d1 1959 struct diff_options *o;
cf1b7869 1960 unsigned ws_rule;
62c64895 1961 unsigned status;
88246898
JS
1962};
1963
a757c646 1964static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
04954043
JH
1965{
1966 char firstchar;
1967 int cnt;
1968
a757c646 1969 if (len < marker_size + 1)
04954043
JH
1970 return 0;
1971 firstchar = line[0];
1972 switch (firstchar) {
a757c646 1973 case '=': case '>': case '<': case '|':
04954043
JH
1974 break;
1975 default:
1976 return 0;
1977 }
a757c646 1978 for (cnt = 1; cnt < marker_size; cnt++)
04954043
JH
1979 if (line[cnt] != firstchar)
1980 return 0;
a757c646
JH
1981 /* line[1] thru line[marker_size-1] are same as firstchar */
1982 if (len < marker_size + 1 || !isspace(line[marker_size]))
04954043 1983 return 0;
04954043
JH
1984 return 1;
1985}
1986
88246898
JS
1987static void checkdiff_consume(void *priv, char *line, unsigned long len)
1988{
1989 struct checkdiff_t *data = priv;
a757c646 1990 int marker_size = data->conflict_marker_size;
f1c96261
JK
1991 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1992 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1993 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
c1795bb0 1994 char *err;
7be57610
BY
1995 char *line_prefix = "";
1996 struct strbuf *msgbuf;
1997
1998 assert(data->o);
1999 if (data->o->output_prefix) {
2000 msgbuf = data->o->output_prefix(data->o,
2001 data->o->output_prefix_data);
2002 line_prefix = msgbuf->buf;
2003 }
88246898
JS
2004
2005 if (line[0] == '+') {
18374e58 2006 unsigned bad;
0ef617f4 2007 data->lineno++;
a757c646 2008 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
04954043
JH
2009 data->status |= 1;
2010 fprintf(data->o->file,
7be57610
BY
2011 "%s%s:%d: leftover conflict marker\n",
2012 line_prefix, data->filename, data->lineno);
04954043 2013 }
8f8841e9 2014 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 2015 if (!bad)
c1795bb0 2016 return;
18374e58
JH
2017 data->status |= bad;
2018 err = whitespace_error_string(bad);
7be57610
BY
2019 fprintf(data->o->file, "%s%s:%d: %s.\n",
2020 line_prefix, data->filename, data->lineno, err);
c1795bb0 2021 free(err);
a3c158d4 2022 emit_line(data->o, set, reset, line, 1);
8f8841e9 2023 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 2024 data->o->file, set, reset, ws);
877f23cc 2025 } else if (line[0] == ' ') {
88246898 2026 data->lineno++;
877f23cc 2027 } else if (line[0] == '@') {
88246898
JS
2028 char *plus = strchr(line, '+');
2029 if (plus)
0ef617f4 2030 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
2031 else
2032 die("invalid diff");
2033 }
2034}
2035
0660626c
JH
2036static unsigned char *deflate_it(char *data,
2037 unsigned long size,
2038 unsigned long *result_size)
051308f6 2039{
0660626c
JH
2040 int bound;
2041 unsigned char *deflated;
ef49a7a0 2042 git_zstream stream;
0660626c
JH
2043
2044 memset(&stream, 0, sizeof(stream));
55bb5c91 2045 git_deflate_init(&stream, zlib_compression_level);
225a6f10 2046 bound = git_deflate_bound(&stream, size);
0660626c
JH
2047 deflated = xmalloc(bound);
2048 stream.next_out = deflated;
2049 stream.avail_out = bound;
2050
2051 stream.next_in = (unsigned char *)data;
2052 stream.avail_in = size;
55bb5c91 2053 while (git_deflate(&stream, Z_FINISH) == Z_OK)
0660626c 2054 ; /* nothing */
55bb5c91 2055 git_deflate_end(&stream);
0660626c
JH
2056 *result_size = stream.total_out;
2057 return deflated;
051308f6
JH
2058}
2059
7be57610 2060static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
051308f6 2061{
0660626c
JH
2062 void *cp;
2063 void *delta;
2064 void *deflated;
2065 void *data;
2066 unsigned long orig_size;
2067 unsigned long delta_size;
2068 unsigned long deflate_size;
2069 unsigned long data_size;
051308f6 2070
0660626c
JH
2071 /* We could do deflated delta, or we could do just deflated two,
2072 * whichever is smaller.
051308f6 2073 */
0660626c
JH
2074 delta = NULL;
2075 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2076 if (one->size && two->size) {
2077 delta = diff_delta(one->ptr, one->size,
2078 two->ptr, two->size,
2079 &delta_size, deflate_size);
2080 if (delta) {
2081 void *to_free = delta;
2082 orig_size = delta_size;
2083 delta = deflate_it(delta, delta_size, &delta_size);
2084 free(to_free);
051308f6
JH
2085 }
2086 }
051308f6 2087
0660626c 2088 if (delta && delta_size < deflate_size) {
7be57610 2089 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
0660626c
JH
2090 free(deflated);
2091 data = delta;
2092 data_size = delta_size;
2093 }
2094 else {
7be57610 2095 fprintf(file, "%sliteral %lu\n", prefix, two->size);
0660626c
JH
2096 free(delta);
2097 data = deflated;
2098 data_size = deflate_size;
2099 }
051308f6 2100
0660626c
JH
2101 /* emit data encoded in base85 */
2102 cp = data;
2103 while (data_size) {
2104 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 2105 char line[70];
0660626c 2106 data_size -= bytes;
051308f6
JH
2107 if (bytes <= 26)
2108 line[0] = bytes + 'A' - 1;
2109 else
2110 line[0] = bytes - 26 + 'a' - 1;
2111 encode_85(line + 1, cp, bytes);
1d7f171c 2112 cp = (char *) cp + bytes;
7be57610 2113 fprintf(file, "%s", prefix);
c0c77734
DB
2114 fputs(line, file);
2115 fputc('\n', file);
051308f6 2116 }
7be57610 2117 fprintf(file, "%s\n", prefix);
0660626c 2118 free(data);
051308f6
JH
2119}
2120
7be57610 2121static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
d4c452f0 2122{
7be57610
BY
2123 fprintf(file, "%sGIT binary patch\n", prefix);
2124 emit_binary_diff_body(file, one, two, prefix);
2125 emit_binary_diff_body(file, two, one, prefix);
d4c452f0
JH
2126}
2127
29a3eefd
JH
2128int diff_filespec_is_binary(struct diff_filespec *one)
2129{
122aa6f9
JK
2130 if (one->is_binary == -1) {
2131 diff_filespec_load_driver(one);
2132 if (one->driver->binary != -1)
2133 one->is_binary = one->driver->binary;
2134 else {
2135 if (!one->data && DIFF_FILE_VALID(one))
2136 diff_populate_filespec(one, 0);
2137 if (one->data)
2138 one->is_binary = buffer_is_binary(one->data,
2139 one->size);
2140 if (one->is_binary == -1)
2141 one->is_binary = 0;
2142 }
2143 }
29a3eefd 2144 return one->is_binary;
6973dcae
JH
2145}
2146
be58e70d 2147static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
f258475a 2148{
122aa6f9
JK
2149 diff_filespec_load_driver(one);
2150 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
f258475a
JH
2151}
2152
a5a818ee
JH
2153void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2154{
2155 if (!options->a_prefix)
2156 options->a_prefix = a;
2157 if (!options->b_prefix)
2158 options->b_prefix = b;
2159}
2160
a788d7d5 2161struct userdiff_driver *get_textconv(struct diff_filespec *one)
04427ac8
JK
2162{
2163 if (!DIFF_FILE_VALID(one))
2164 return NULL;
d391c0ff 2165
04427ac8 2166 diff_filespec_load_driver(one);
3813e690 2167 return userdiff_get_textconv(one->driver);
04427ac8
JK
2168}
2169
6973dcae
JH
2170static void builtin_diff(const char *name_a,
2171 const char *name_b,
2172 struct diff_filespec *one,
2173 struct diff_filespec *two,
2174 const char *xfrm_msg,
296c6bb2 2175 int must_show_header,
051308f6 2176 struct diff_options *o,
6973dcae
JH
2177 int complete_rewrite)
2178{
2179 mmfile_t mf1, mf2;
2180 const char *lbl[2];
2181 char *a_one, *b_two;
8f67f8ae
PH
2182 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2183 const char *reset = diff_get_color_opt(o, DIFF_RESET);
a5a818ee 2184 const char *a_prefix, *b_prefix;
d9bae1a1
JK
2185 struct userdiff_driver *textconv_one = NULL;
2186 struct userdiff_driver *textconv_two = NULL;
3e97c7c6 2187 struct strbuf header = STRBUF_INIT;
7be57610
BY
2188 struct strbuf *msgbuf;
2189 char *line_prefix = "";
2190
2191 if (o->output_prefix) {
2192 msgbuf = o->output_prefix(o, o->output_prefix_data);
2193 line_prefix = msgbuf->buf;
2194 }
a5a818ee 2195
752c0c24
JS
2196 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2197 (!one->mode || S_ISGITLINK(one->mode)) &&
2198 (!two->mode || S_ISGITLINK(two->mode))) {
2199 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2200 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2201 show_submodule_summary(o->file, one ? one->path : two->path,
721ceec1 2202 one->sha1, two->sha1, two->dirty_submodule,
752c0c24
JS
2203 del, add, reset);
2204 return;
2205 }
2206
3aa1f7ca
JK
2207 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2208 textconv_one = get_textconv(one);
2209 textconv_two = get_textconv(two);
2210 }
2211
a5a818ee
JH
2212 diff_set_mnemonic_prefix(o, "a/", "b/");
2213 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2214 a_prefix = o->b_prefix;
2215 b_prefix = o->a_prefix;
2216 } else {
2217 a_prefix = o->a_prefix;
2218 b_prefix = o->b_prefix;
2219 }
6973dcae 2220
71b989e7
LT
2221 /* Never use a non-valid filename anywhere if at all possible */
2222 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2223 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2224
a5a818ee
JH
2225 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2226 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
2227 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2228 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
7be57610 2229 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
6973dcae
JH
2230 if (lbl[0][0] == '/') {
2231 /* /dev/null */
7be57610 2232 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
37466447
BW
2233 if (xfrm_msg)
2234 strbuf_addstr(&header, xfrm_msg);
296c6bb2 2235 must_show_header = 1;
6973dcae
JH
2236 }
2237 else if (lbl[1][0] == '/') {
7be57610 2238 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
37466447
BW
2239 if (xfrm_msg)
2240 strbuf_addstr(&header, xfrm_msg);
296c6bb2 2241 must_show_header = 1;
6973dcae
JH
2242 }
2243 else {
2244 if (one->mode != two->mode) {
7be57610
BY
2245 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2246 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
296c6bb2 2247 must_show_header = 1;
cd112cef 2248 }
37466447
BW
2249 if (xfrm_msg)
2250 strbuf_addstr(&header, xfrm_msg);
3e97c7c6 2251
6973dcae
JH
2252 /*
2253 * we do not run diff between different kind
2254 * of objects.
2255 */
2256 if ((one->mode ^ two->mode) & S_IFMT)
2257 goto free_ab_and_return;
0c01857d 2258 if (complete_rewrite &&
3aa1f7ca
JK
2259 (textconv_one || !diff_filespec_is_binary(one)) &&
2260 (textconv_two || !diff_filespec_is_binary(two))) {
3e97c7c6
GB
2261 fprintf(o->file, "%s", header.buf);
2262 strbuf_reset(&header);
3aa1f7ca
JK
2263 emit_rewrite_diff(name_a, name_b, one, two,
2264 textconv_one, textconv_two, o);
34a5e1a2 2265 o->found_changes = 1;
6973dcae
JH
2266 goto free_ab_and_return;
2267 }
2268 }
2269
467ddc14
JH
2270 if (o->irreversible_delete && lbl[1][0] == '/') {
2271 fprintf(o->file, "%s", header.buf);
2272 strbuf_reset(&header);
2273 goto free_ab_and_return;
2274 } else if (!DIFF_OPT_TST(o, TEXT) &&
b3373982
JK
2275 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2276 (!textconv_two && diff_filespec_is_binary(two)) )) {
2277 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2278 die("unable to read files to diff");
0660626c
JH
2279 /* Quite common confusing case */
2280 if (mf1.size == mf2.size &&
296c6bb2
CC
2281 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2282 if (must_show_header)
2283 fprintf(o->file, "%s", header.buf);
0660626c 2284 goto free_ab_and_return;
296c6bb2 2285 }
3e97c7c6
GB
2286 fprintf(o->file, "%s", header.buf);
2287 strbuf_reset(&header);
8f67f8ae 2288 if (DIFF_OPT_TST(o, BINARY))
7be57610 2289 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
051308f6 2290 else
7be57610
BY
2291 fprintf(o->file, "%sBinary files %s and %s differ\n",
2292 line_prefix, lbl[0], lbl[1]);
34a5e1a2 2293 o->found_changes = 1;
467ddc14 2294 } else {
6973dcae
JH
2295 /* Crazy xdl interfaces.. */
2296 const char *diffopts = getenv("GIT_DIFF_OPTS");
2297 xpparam_t xpp;
2298 xdemitconf_t xecfg;
6973dcae 2299 struct emit_callback ecbdata;
be58e70d 2300 const struct userdiff_funcname *pe;
f258475a 2301
b3f01ff2 2302 if (must_show_header) {
3e97c7c6
GB
2303 fprintf(o->file, "%s", header.buf);
2304 strbuf_reset(&header);
2305 }
2306
840383b2
JK
2307 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2308 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
04427ac8 2309
45e7ca0f
BC
2310 pe = diff_funcname_pattern(one);
2311 if (!pe)
2312 pe = diff_funcname_pattern(two);
6973dcae 2313
9ccd0a88 2314 memset(&xpp, 0, sizeof(xpp));
30b25010 2315 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 2316 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 2317 ecbdata.label_path = lbl;
daa0c3d9 2318 ecbdata.color_diff = want_color(o->use_color);
34a5e1a2 2319 ecbdata.found_changesp = &o->found_changes;
cf1b7869 2320 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
690ed843 2321 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
d68fe26f 2322 check_blank_at_eof(&mf1, &mf2, &ecbdata);
a3c158d4 2323 ecbdata.opt = o;
3e97c7c6 2324 ecbdata.header = header.len ? &header : NULL;
582aa00b 2325 xpp.flags = o->xdl_opts;
ee1e5412 2326 xecfg.ctxlen = o->context;
6d0e674a 2327 xecfg.interhunkctxlen = o->interhunkcontext;
6973dcae 2328 xecfg.flags = XDL_EMIT_FUNCNAMES;
14937c2c
RS
2329 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2330 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
45e7ca0f 2331 if (pe)
a013585b 2332 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
6973dcae
JH
2333 if (!diffopts)
2334 ;
cc44c765 2335 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 2336 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 2337 else if (!prefixcmp(diffopts, "-u"))
6973dcae 2338 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
77d1a520
TR
2339 if (o->word_diff)
2340 init_diff_words_data(&ecbdata, o, one, two);
8a3f524b 2341 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
dfea7900 2342 &xpp, &xecfg);
882749a0 2343 if (o->word_diff)
f59a59e2 2344 free_diff_words_data(&ecbdata);
04427ac8
JK
2345 if (textconv_one)
2346 free(mf1.ptr);
2347 if (textconv_two)
2348 free(mf2.ptr);
8cfe5f1c 2349 xdiff_clear_find_func(&xecfg);
6973dcae
JH
2350 }
2351
2352 free_ab_and_return:
3e97c7c6 2353 strbuf_release(&header);
fc3abdf5
JH
2354 diff_free_filespec_data(one);
2355 diff_free_filespec_data(two);
6973dcae
JH
2356 free(a_one);
2357 free(b_two);
2358 return;
2359}
2360
2361static void builtin_diffstat(const char *name_a, const char *name_b,
2362 struct diff_filespec *one,
2363 struct diff_filespec *two,
710158e3 2364 struct diffstat_t *diffstat,
0d21efa5 2365 struct diff_options *o,
710158e3 2366 int complete_rewrite)
6973dcae
JH
2367{
2368 mmfile_t mf1, mf2;
2369 struct diffstat_file *data;
2370
2371 data = diffstat_add(diffstat, name_a, name_b);
2372
2373 if (!one || !two) {
2374 data->is_unmerged = 1;
2375 return;
2376 }
ded0abc7
JK
2377
2378 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
ded0abc7 2379 data->is_binary = 1;
abb371a1
JK
2380 data->added = diff_filespec_size(two);
2381 data->deleted = diff_filespec_size(one);
ded0abc7
JK
2382 }
2383
2384 else if (complete_rewrite) {
710158e3
JH
2385 diff_populate_filespec(one, 0);
2386 diff_populate_filespec(two, 0);
2387 data->deleted = count_lines(one->data, one->size);
2388 data->added = count_lines(two->data, two->size);
710158e3 2389 }
6973dcae 2390
ded0abc7 2391 else {
6973dcae
JH
2392 /* Crazy xdl interfaces.. */
2393 xpparam_t xpp;
2394 xdemitconf_t xecfg;
6973dcae 2395
ded0abc7
JK
2396 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2397 die("unable to read files to diff");
2398
9ccd0a88 2399 memset(&xpp, 0, sizeof(xpp));
30b25010 2400 memset(&xecfg, 0, sizeof(xecfg));
582aa00b 2401 xpp.flags = o->xdl_opts;
f01cae91
JH
2402 xecfg.ctxlen = o->context;
2403 xecfg.interhunkctxlen = o->interhunkcontext;
8a3f524b 2404 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
dfea7900 2405 &xpp, &xecfg);
6973dcae 2406 }
fc3abdf5 2407
fc3abdf5
JH
2408 diff_free_filespec_data(one);
2409 diff_free_filespec_data(two);
6973dcae
JH
2410}
2411
88246898 2412static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 2413 const char *attr_path,
5ff10dd6
JH
2414 struct diff_filespec *one,
2415 struct diff_filespec *two,
2416 struct diff_options *o)
88246898
JS
2417{
2418 mmfile_t mf1, mf2;
2419 struct checkdiff_t data;
2420
2421 if (!two)
2422 return;
2423
2424 memset(&data, 0, sizeof(data));
88246898
JS
2425 data.filename = name_b ? name_b : name_a;
2426 data.lineno = 0;
1ba111d1 2427 data.o = o;
cd676a51 2428 data.ws_rule = whitespace_rule(attr_path);
a757c646 2429 data.conflict_marker_size = ll_merge_marker_size(attr_path);
88246898
JS
2430
2431 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2432 die("unable to read files to diff");
2433
5ff10dd6
JH
2434 /*
2435 * All the other codepaths check both sides, but not checking
2436 * the "old" side here is deliberate. We are checking the newly
2437 * introduced changes, and as long as the "new" side is text, we
2438 * can and should check what it introduces.
2439 */
29a3eefd 2440 if (diff_filespec_is_binary(two))
fc3abdf5 2441 goto free_and_return;
88246898
JS
2442 else {
2443 /* Crazy xdl interfaces.. */
2444 xpparam_t xpp;
2445 xdemitconf_t xecfg;
88246898 2446
9ccd0a88 2447 memset(&xpp, 0, sizeof(xpp));
30b25010 2448 memset(&xecfg, 0, sizeof(xecfg));
c35539eb 2449 xecfg.ctxlen = 1; /* at least one context line */
582aa00b 2450 xpp.flags = 0;
8a3f524b 2451 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
dfea7900 2452 &xpp, &xecfg);
877f23cc 2453
467babf8 2454 if (data.ws_rule & WS_BLANK_AT_EOF) {
d68fe26f
JH
2455 struct emit_callback ecbdata;
2456 int blank_at_eof;
2457
2458 ecbdata.ws_rule = data.ws_rule;
2459 check_blank_at_eof(&mf1, &mf2, &ecbdata);
8837d335 2460 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
d68fe26f 2461
467babf8
JH
2462 if (blank_at_eof) {
2463 static char *err;
2464 if (!err)
2465 err = whitespace_error_string(WS_BLANK_AT_EOF);
2466 fprintf(o->file, "%s:%d: %s.\n",
2467 data.filename, blank_at_eof, err);
2468 data.status = 1; /* report errors */
2469 }
877f23cc 2470 }
88246898 2471 }
fc3abdf5
JH
2472 free_and_return:
2473 diff_free_filespec_data(one);
2474 diff_free_filespec_data(two);
62c64895
WC
2475 if (data.status)
2476 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
2477}
2478
6973dcae
JH
2479struct diff_filespec *alloc_filespec(const char *path)
2480{
2481 int namelen = strlen(path);
2482 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2483
2484 memset(spec, 0, sizeof(*spec));
2485 spec->path = (char *)(spec + 1);
2486 memcpy(spec->path, path, namelen+1);
9fb88419 2487 spec->count = 1;
122aa6f9 2488 spec->is_binary = -1;
6973dcae
JH
2489 return spec;
2490}
2491
9fb88419
LT
2492void free_filespec(struct diff_filespec *spec)
2493{
2494 if (!--spec->count) {
2495 diff_free_filespec_data(spec);
2496 free(spec);
2497 }
2498}
2499
6973dcae
JH
2500void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2501 unsigned short mode)
2502{
2503 if (mode) {
2504 spec->mode = canon_mode(mode);
e702496e 2505 hashcpy(spec->sha1, sha1);
0bef57ee 2506 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
2507 }
2508}
2509
2510/*
5adf317b 2511 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
2512 * the work tree has that object contents, return true, so that
2513 * prepare_temp_file() does not have to inflate and extract.
2514 */
1510fea7 2515static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
2516{
2517 struct cache_entry *ce;
2518 struct stat st;
2519 int pos, len;
2520
150115ad
JH
2521 /*
2522 * We do not read the cache ourselves here, because the
6973dcae
JH
2523 * benchmark with my previous version that always reads cache
2524 * shows that it makes things worse for diff-tree comparing
2525 * two linux-2.6 kernel trees in an already checked out work
2526 * tree. This is because most diff-tree comparisons deal with
2527 * only a small number of files, while reading the cache is
2528 * expensive for a large project, and its cost outweighs the
2529 * savings we get by not inflating the object to a temporary
2530 * file. Practically, this code only helps when we are used
2531 * by diff-cache --cached, which does read the cache before
2532 * calling us.
2533 */
2534 if (!active_cache)
2535 return 0;
2536
1510fea7
SP
2537 /* We want to avoid the working directory if our caller
2538 * doesn't need the data in a normal file, this system
2539 * is rather slow with its stat/open/mmap/close syscalls,
2540 * and the object is contained in a pack file. The pack
2541 * is probably already open and will be faster to obtain
2542 * the data through than the working directory. Loose
2543 * objects however would tend to be slower as they need
2544 * to be individually opened and inflated.
2545 */
cd673c1f 2546 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1510fea7
SP
2547 return 0;
2548
6973dcae
JH
2549 len = strlen(name);
2550 pos = cache_name_pos(name, len);
2551 if (pos < 0)
2552 return 0;
2553 ce = active_cache[pos];
eadb5831
JH
2554
2555 /*
2556 * This is not the sha1 we are looking for, or
2557 * unreusable because it is not a regular file.
2558 */
2559 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 2560 return 0;
eadb5831 2561
150115ad
JH
2562 /*
2563 * If ce is marked as "assume unchanged", there is no
2564 * guarantee that work tree matches what we are looking for.
2565 */
b4d1690d 2566 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
150115ad
JH
2567 return 0;
2568
eadb5831
JH
2569 /*
2570 * If ce matches the file in the work tree, we can reuse it.
6973dcae 2571 */
eadb5831
JH
2572 if (ce_uptodate(ce) ||
2573 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2574 return 1;
2575
2576 return 0;
6973dcae
JH
2577}
2578
3afaa72d
JH
2579static int populate_from_stdin(struct diff_filespec *s)
2580{
f285a2d7 2581 struct strbuf buf = STRBUF_INIT;
c32f749f 2582 size_t size = 0;
af6eb822 2583
f1696ee3 2584 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 2585 return error("error while reading from stdin %s",
3afaa72d 2586 strerror(errno));
af6eb822 2587
3afaa72d 2588 s->should_munmap = 0;
c32f749f
RS
2589 s->data = strbuf_detach(&buf, &size);
2590 s->size = size;
3afaa72d
JH
2591 s->should_free = 1;
2592 return 0;
2593}
2594
04786756
LT
2595static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2596{
2597 int len;
8e08b419
JH
2598 char *data = xmalloc(100), *dirty = "";
2599
2600 /* Are we looking at the work tree? */
85adbf2f 2601 if (s->dirty_submodule)
8e08b419
JH
2602 dirty = "-dirty";
2603
04786756 2604 len = snprintf(data, 100,
8e08b419 2605 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
04786756
LT
2606 s->data = data;
2607 s->size = len;
2608 s->should_free = 1;
2609 if (size_only) {
2610 s->data = NULL;
2611 free(data);
2612 }
2613 return 0;
2614}
2615
6973dcae
JH
2616/*
2617 * While doing rename detection and pickaxe operation, we may need to
2618 * grab the data for the blob (or file) for our own in-core comparison.
2619 * diff_filespec has data and size fields for this purpose.
2620 */
2621int diff_populate_filespec(struct diff_filespec *s, int size_only)
2622{
2623 int err = 0;
2624 if (!DIFF_FILE_VALID(s))
2625 die("internal error: asking to populate invalid file.");
2626 if (S_ISDIR(s->mode))
2627 return -1;
2628
6973dcae 2629 if (s->data)
fc3abdf5 2630 return 0;
04786756 2631
6e0b8ed6
JH
2632 if (size_only && 0 < s->size)
2633 return 0;
2634
302b9282 2635 if (S_ISGITLINK(s->mode))
04786756
LT
2636 return diff_populate_gitlink(s, size_only);
2637
6973dcae 2638 if (!s->sha1_valid ||
1510fea7 2639 reuse_worktree_file(s->path, s->sha1, 0)) {
f285a2d7 2640 struct strbuf buf = STRBUF_INIT;
6973dcae
JH
2641 struct stat st;
2642 int fd;
6c510bee 2643
3afaa72d
JH
2644 if (!strcmp(s->path, "-"))
2645 return populate_from_stdin(s);
2646
6973dcae
JH
2647 if (lstat(s->path, &st) < 0) {
2648 if (errno == ENOENT) {
2649 err_empty:
2650 err = -1;
2651 empty:
d2543b8e 2652 s->data = (char *)"";
6973dcae
JH
2653 s->size = 0;
2654 return err;
2655 }
2656 }
dc49cd76 2657 s->size = xsize_t(st.st_size);
6973dcae
JH
2658 if (!s->size)
2659 goto empty;
6973dcae 2660 if (S_ISLNK(st.st_mode)) {
cf219d8c
LT
2661 struct strbuf sb = STRBUF_INIT;
2662
2663 if (strbuf_readlink(&sb, s->path, s->size))
6973dcae 2664 goto err_empty;
0956a6db
RS
2665 s->size = sb.len;
2666 s->data = strbuf_detach(&sb, NULL);
cf219d8c 2667 s->should_free = 1;
6973dcae
JH
2668 return 0;
2669 }
cf219d8c
LT
2670 if (size_only)
2671 return 0;
6973dcae
JH
2672 fd = open(s->path, O_RDONLY);
2673 if (fd < 0)
2674 goto err_empty;
c4712e45 2675 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 2676 close(fd);
6973dcae 2677 s->should_munmap = 1;
6c510bee
LT
2678
2679 /*
2680 * Convert from working tree format to canonical git format
2681 */
21e5ad50 2682 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 2683 size_t size = 0;
6c510bee
LT
2684 munmap(s->data, s->size);
2685 s->should_munmap = 0;
c32f749f
RS
2686 s->data = strbuf_detach(&buf, &size);
2687 s->size = size;
6c510bee
LT
2688 s->should_free = 1;
2689 }
6973dcae
JH
2690 }
2691 else {
21666f1a 2692 enum object_type type;
c50c4316 2693 if (size_only) {
21666f1a 2694 type = sha1_object_info(s->sha1, &s->size);
c50c4316
NP
2695 if (type < 0)
2696 die("unable to read %s", sha1_to_hex(s->sha1));
2697 } else {
21666f1a 2698 s->data = read_sha1_file(s->sha1, &type, &s->size);
c50c4316
NP
2699 if (!s->data)
2700 die("unable to read %s", sha1_to_hex(s->sha1));
6973dcae
JH
2701 s->should_free = 1;
2702 }
2703 }
2704 return 0;
2705}
2706
8ae92e63 2707void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
2708{
2709 if (s->should_free)
2710 free(s->data);
2711 else if (s->should_munmap)
2712 munmap(s->data, s->size);
fc3abdf5
JH
2713
2714 if (s->should_free || s->should_munmap) {
2715 s->should_free = s->should_munmap = 0;
2716 s->data = NULL;
2717 }
eede7b7d
JK
2718}
2719
2720void diff_free_filespec_data(struct diff_filespec *s)
2721{
8ae92e63 2722 diff_free_filespec_blob(s);
6973dcae
JH
2723 free(s->cnt_data);
2724 s->cnt_data = NULL;
2725}
2726
4e218f54 2727static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
6973dcae
JH
2728 void *blob,
2729 unsigned long size,
2730 const unsigned char *sha1,
2731 int mode)
2732{
2733 int fd;
4e218f54 2734 struct strbuf buf = STRBUF_INIT;
003b33a8
DA
2735 struct strbuf template = STRBUF_INIT;
2736 char *path_dup = xstrdup(path);
2737 const char *base = basename(path_dup);
6973dcae 2738
003b33a8
DA
2739 /* Generate "XXXXXX_basename.ext" */
2740 strbuf_addstr(&template, "XXXXXX_");
2741 strbuf_addstr(&template, base);
2742
2743 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2744 strlen(base) + 1);
6973dcae 2745 if (fd < 0)
d824cbba 2746 die_errno("unable to create temp-file");
4e218f54
JS
2747 if (convert_to_working_tree(path,
2748 (const char *)blob, (size_t)size, &buf)) {
2749 blob = buf.buf;
2750 size = buf.len;
2751 }
93822c22 2752 if (write_in_full(fd, blob, size) != size)
0721c314 2753 die_errno("unable to write temp-file");
6973dcae
JH
2754 close(fd);
2755 temp->name = temp->tmp_path;
2756 strcpy(temp->hex, sha1_to_hex(sha1));
2757 temp->hex[40] = 0;
2758 sprintf(temp->mode, "%06o", mode);
4e218f54 2759 strbuf_release(&buf);
003b33a8
DA
2760 strbuf_release(&template);
2761 free(path_dup);
6973dcae
JH
2762}
2763
479b0ae8
JK
2764static struct diff_tempfile *prepare_temp_file(const char *name,
2765 struct diff_filespec *one)
6973dcae 2766{
479b0ae8
JK
2767 struct diff_tempfile *temp = claim_diff_tempfile();
2768
6973dcae
JH
2769 if (!DIFF_FILE_VALID(one)) {
2770 not_a_valid_file:
2771 /* A '-' entry produces this for file-2, and
2772 * a '+' entry produces this for file-1.
2773 */
2774 temp->name = "/dev/null";
2775 strcpy(temp->hex, ".");
2776 strcpy(temp->mode, ".");
479b0ae8
JK
2777 return temp;
2778 }
2779
2780 if (!remove_tempfile_installed) {
2781 atexit(remove_tempfile);
57b235a4 2782 sigchain_push_common(remove_tempfile_on_signal);
479b0ae8 2783 remove_tempfile_installed = 1;
6973dcae
JH
2784 }
2785
2786 if (!one->sha1_valid ||
1510fea7 2787 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
2788 struct stat st;
2789 if (lstat(name, &st) < 0) {
2790 if (errno == ENOENT)
2791 goto not_a_valid_file;
d824cbba 2792 die_errno("stat(%s)", name);
6973dcae
JH
2793 }
2794 if (S_ISLNK(st.st_mode)) {
3cd7388d
JK
2795 struct strbuf sb = STRBUF_INIT;
2796 if (strbuf_readlink(&sb, name, st.st_size) < 0)
0721c314 2797 die_errno("readlink(%s)", name);
3cd7388d 2798 prep_temp_blob(name, temp, sb.buf, sb.len,
6973dcae
JH
2799 (one->sha1_valid ?
2800 one->sha1 : null_sha1),
2801 (one->sha1_valid ?
2802 one->mode : S_IFLNK));
3cd7388d 2803 strbuf_release(&sb);
6973dcae
JH
2804 }
2805 else {
2806 /* we can borrow from the file in the work tree */
2807 temp->name = name;
2808 if (!one->sha1_valid)
2809 strcpy(temp->hex, sha1_to_hex(null_sha1));
2810 else
2811 strcpy(temp->hex, sha1_to_hex(one->sha1));
2812 /* Even though we may sometimes borrow the
2813 * contents from the work tree, we always want
2814 * one->mode. mode is trustworthy even when
2815 * !(one->sha1_valid), as long as
2816 * DIFF_FILE_VALID(one).
2817 */
2818 sprintf(temp->mode, "%06o", one->mode);
2819 }
479b0ae8 2820 return temp;
6973dcae
JH
2821 }
2822 else {
2823 if (diff_populate_filespec(one, 0))
2824 die("cannot read data blob for %s", one->path);
4e218f54 2825 prep_temp_blob(name, temp, one->data, one->size,
6973dcae
JH
2826 one->sha1, one->mode);
2827 }
479b0ae8 2828 return temp;
6973dcae
JH
2829}
2830
6973dcae
JH
2831/* An external diff command takes:
2832 *
2833 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2834 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2835 *
2836 */
2837static void run_external_diff(const char *pgm,
2838 const char *name,
2839 const char *other,
2840 struct diff_filespec *one,
2841 struct diff_filespec *two,
2842 const char *xfrm_msg,
2843 int complete_rewrite)
2844{
2845 const char *spawn_arg[10];
6973dcae 2846 int retval;
6973dcae
JH
2847 const char **arg = &spawn_arg[0];
2848
6973dcae 2849 if (one && two) {
479b0ae8
JK
2850 struct diff_tempfile *temp_one, *temp_two;
2851 const char *othername = (other ? other : name);
2852 temp_one = prepare_temp_file(name, one);
2853 temp_two = prepare_temp_file(othername, two);
6973dcae
JH
2854 *arg++ = pgm;
2855 *arg++ = name;
479b0ae8
JK
2856 *arg++ = temp_one->name;
2857 *arg++ = temp_one->hex;
2858 *arg++ = temp_one->mode;
2859 *arg++ = temp_two->name;
2860 *arg++ = temp_two->hex;
2861 *arg++ = temp_two->mode;
6973dcae
JH
2862 if (other) {
2863 *arg++ = other;
2864 *arg++ = xfrm_msg;
2865 }
2866 } else {
2867 *arg++ = pgm;
2868 *arg++ = name;
2869 }
2870 *arg = NULL;
d5535ec7 2871 fflush(NULL);
7ed7fac4 2872 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
6973dcae
JH
2873 remove_tempfile();
2874 if (retval) {
2875 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2876 exit(1);
2877 }
2878}
2879
b67b9612
JH
2880static int similarity_index(struct diff_filepair *p)
2881{
2882 return p->score * 100 / MAX_SCORE;
2883}
2884
2885static void fill_metainfo(struct strbuf *msg,
2886 const char *name,
2887 const char *other,
2888 struct diff_filespec *one,
2889 struct diff_filespec *two,
2890 struct diff_options *o,
37466447 2891 struct diff_filepair *p,
5977744d 2892 int *must_show_header,
37466447 2893 int use_color)
b67b9612 2894{
37466447
BW
2895 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2896 const char *reset = diff_get_color(use_color, DIFF_RESET);
7be57610
BY
2897 struct strbuf *msgbuf;
2898 char *line_prefix = "";
2899
296c6bb2 2900 *must_show_header = 1;
7be57610
BY
2901 if (o->output_prefix) {
2902 msgbuf = o->output_prefix(o, o->output_prefix_data);
2903 line_prefix = msgbuf->buf;
2904 }
b67b9612
JH
2905 strbuf_init(msg, PATH_MAX * 2 + 300);
2906 switch (p->status) {
2907 case DIFF_STATUS_COPIED:
98ad90fb
JH
2908 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2909 line_prefix, set, similarity_index(p));
2910 strbuf_addf(msg, "%s\n%s%scopy from ",
2911 reset, line_prefix, set);
b67b9612 2912 quote_c_style(name, msg, NULL, 0);
98ad90fb 2913 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
b67b9612 2914 quote_c_style(other, msg, NULL, 0);
37466447 2915 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
2916 break;
2917 case DIFF_STATUS_RENAMED:
98ad90fb
JH
2918 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2919 line_prefix, set, similarity_index(p));
2920 strbuf_addf(msg, "%s\n%s%srename from ",
2921 reset, line_prefix, set);
b67b9612 2922 quote_c_style(name, msg, NULL, 0);
98ad90fb
JH
2923 strbuf_addf(msg, "%s\n%s%srename to ",
2924 reset, line_prefix, set);
b67b9612 2925 quote_c_style(other, msg, NULL, 0);
37466447 2926 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
2927 break;
2928 case DIFF_STATUS_MODIFIED:
2929 if (p->score) {
98ad90fb
JH
2930 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2931 line_prefix,
37466447 2932 set, similarity_index(p), reset);
b67b9612
JH
2933 break;
2934 }
2935 /* fallthru */
2936 default:
296c6bb2 2937 *must_show_header = 0;
b67b9612
JH
2938 }
2939 if (one && two && hashcmp(one->sha1, two->sha1)) {
2940 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2941
2942 if (DIFF_OPT_TST(o, BINARY)) {
2943 mmfile_t mf;
2944 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2945 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2946 abbrev = 40;
2947 }
e13f38a3 2948 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3e5a188f
JH
2949 find_unique_abbrev(one->sha1, abbrev));
2950 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
b67b9612
JH
2951 if (one->mode == two->mode)
2952 strbuf_addf(msg, " %06o", one->mode);
37466447 2953 strbuf_addf(msg, "%s\n", reset);
b67b9612 2954 }
b67b9612
JH
2955}
2956
6973dcae
JH
2957static void run_diff_cmd(const char *pgm,
2958 const char *name,
2959 const char *other,
cd676a51 2960 const char *attr_path,
6973dcae
JH
2961 struct diff_filespec *one,
2962 struct diff_filespec *two,
b67b9612 2963 struct strbuf *msg,
051308f6 2964 struct diff_options *o,
b67b9612 2965 struct diff_filepair *p)
6973dcae 2966{
b67b9612
JH
2967 const char *xfrm_msg = NULL;
2968 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
296c6bb2 2969 int must_show_header = 0;
b67b9612 2970
8f67f8ae 2971 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2972 pgm = NULL;
2973 else {
be58e70d
JK
2974 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2975 if (drv && drv->external)
2976 pgm = drv->external;
f1af60bd
JH
2977 }
2978
37466447
BW
2979 if (msg) {
2980 /*
2981 * don't use colors when the header is intended for an
2982 * external diff driver
2983 */
2984 fill_metainfo(msg, name, other, one, two, o, p,
5977744d 2985 &must_show_header,
daa0c3d9 2986 want_color(o->use_color) && !pgm);
37466447
BW
2987 xfrm_msg = msg->len ? msg->buf : NULL;
2988 }
2989
6973dcae
JH
2990 if (pgm) {
2991 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2992 complete_rewrite);
2993 return;
2994 }
2995 if (one && two)
2996 builtin_diff(name, other ? other : name,
296c6bb2
CC
2997 one, two, xfrm_msg, must_show_header,
2998 o, complete_rewrite);
6973dcae 2999 else
c0c77734 3000 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
3001}
3002
3003static void diff_fill_sha1_info(struct diff_filespec *one)
3004{
3005 if (DIFF_FILE_VALID(one)) {
3006 if (!one->sha1_valid) {
3007 struct stat st;
5332b2af
JS
3008 if (!strcmp(one->path, "-")) {
3009 hashcpy(one->sha1, null_sha1);
3010 return;
3011 }
6973dcae 3012 if (lstat(one->path, &st) < 0)
0721c314 3013 die_errno("stat '%s'", one->path);
6973dcae 3014 if (index_path(one->sha1, one->path, &st, 0))
d7530708 3015 die("cannot hash %s", one->path);
6973dcae
JH
3016 }
3017 }
3018 else
e702496e 3019 hashclr(one->sha1);
6973dcae
JH
3020}
3021
cd676a51
JH
3022static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
3023{
3024 /* Strip the prefix but do not molest /dev/null and absolute paths */
d8faea9d 3025 if (*namep && **namep != '/') {
cd676a51 3026 *namep += prefix_length;
d8faea9d
JN
3027 if (**namep == '/')
3028 ++*namep;
3029 }
3030 if (*otherp && **otherp != '/') {
cd676a51 3031 *otherp += prefix_length;
d8faea9d
JN
3032 if (**otherp == '/')
3033 ++*otherp;
3034 }
cd676a51
JH
3035}
3036
6973dcae
JH
3037static void run_diff(struct diff_filepair *p, struct diff_options *o)
3038{
3039 const char *pgm = external_diff();
663af342 3040 struct strbuf msg;
663af342
PH
3041 struct diff_filespec *one = p->one;
3042 struct diff_filespec *two = p->two;
6973dcae
JH
3043 const char *name;
3044 const char *other;
cd676a51 3045 const char *attr_path;
663af342 3046
cd676a51
JH
3047 name = p->one->path;
3048 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3049 attr_path = name;
3050 if (o->prefix_length)
3051 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
3052
3053 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51 3054 run_diff_cmd(pgm, name, NULL, attr_path,
b67b9612 3055 NULL, NULL, NULL, o, p);
6973dcae
JH
3056 return;
3057 }
3058
6973dcae
JH
3059 diff_fill_sha1_info(one);
3060 diff_fill_sha1_info(two);
3061
6973dcae
JH
3062 if (!pgm &&
3063 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3064 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
b67b9612
JH
3065 /*
3066 * a filepair that changes between file and symlink
6973dcae
JH
3067 * needs to be split into deletion and creation.
3068 */
3069 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51 3070 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 3071 one, null, &msg, o, p);
6973dcae 3072 free(null);
b67b9612
JH
3073 strbuf_release(&msg);
3074
6973dcae 3075 null = alloc_filespec(one->path);
cd676a51 3076 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 3077 null, two, &msg, o, p);
6973dcae
JH
3078 free(null);
3079 }
3080 else
cd676a51 3081 run_diff_cmd(pgm, name, other, attr_path,
b67b9612 3082 one, two, &msg, o, p);
6973dcae 3083
663af342 3084 strbuf_release(&msg);
6973dcae
JH
3085}
3086
3087static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3088 struct diffstat_t *diffstat)
3089{
3090 const char *name;
3091 const char *other;
710158e3 3092 int complete_rewrite = 0;
6973dcae
JH
3093
3094 if (DIFF_PAIR_UNMERGED(p)) {
3095 /* unmerged */
0d21efa5 3096 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
3097 return;
3098 }
3099
3100 name = p->one->path;
3101 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3102
cd676a51
JH
3103 if (o->prefix_length)
3104 strip_prefix(o->prefix_length, &name, &other);
3105
6973dcae
JH
3106 diff_fill_sha1_info(p->one);
3107 diff_fill_sha1_info(p->two);
3108
710158e3
JH
3109 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3110 complete_rewrite = 1;
0d21efa5 3111 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
3112}
3113
88246898
JS
3114static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3115{
3116 const char *name;
3117 const char *other;
cd676a51 3118 const char *attr_path;
88246898
JS
3119
3120 if (DIFF_PAIR_UNMERGED(p)) {
3121 /* unmerged */
3122 return;
3123 }
3124
3125 name = p->one->path;
3126 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
3127 attr_path = other ? other : name;
3128
3129 if (o->prefix_length)
3130 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
3131
3132 diff_fill_sha1_info(p->one);
3133 diff_fill_sha1_info(p->two);
3134
cd676a51 3135 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
3136}
3137
6973dcae
JH
3138void diff_setup(struct diff_options *options)
3139{
be4f2b40 3140 memcpy(options, &default_diff_options, sizeof(*options));
c0c77734
DB
3141
3142 options->file = stdout;
3143
6973dcae
JH
3144 options->line_termination = '\n';
3145 options->break_opt = -1;
3146 options->rename_limit = -1;
712d2c7d 3147 options->dirstat_permille = diff_dirstat_permille_default;
ee1e5412 3148 options->context = 3;
90d43b07 3149 DIFF_OPT_SET(options, RENAME_EMPTY);
6973dcae
JH
3150
3151 options->change = diff_change;
3152 options->add_remove = diff_addremove;
f1c96261 3153 options->use_color = diff_use_color_default;
b68ea12e 3154 options->detect_rename = diff_detect_rename_default;
eab9a40b 3155
f89504dd
EC
3156 if (diff_no_prefix) {
3157 options->a_prefix = options->b_prefix = "";
3158 } else if (!diff_mnemonic_prefix) {
a5a818ee
JH
3159 options->a_prefix = "a/";
3160 options->b_prefix = "b/";
3161 }
6973dcae
JH
3162}
3163
3164int diff_setup_done(struct diff_options *options)
3165{
d7de00f7
TH
3166 int count = 0;
3167
3168 if (options->output_format & DIFF_FORMAT_NAME)
3169 count++;
3170 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3171 count++;
3172 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3173 count++;
3174 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3175 count++;
3176 if (count > 1)
3177 die("--name-only, --name-status, --check and -s are mutually exclusive");
3178
f245194f
JH
3179 /*
3180 * Most of the time we can say "there are changes"
3181 * only by checking if there are changed paths, but
3182 * --ignore-whitespace* options force us to look
97bf2a08 3183 * inside contents.
f245194f
JH
3184 */
3185
3186 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3187 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3188 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3189 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3190 else
3191 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3192
8f67f8ae 3193 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
3194 options->detect_rename = DIFF_DETECT_COPY;
3195
cd676a51
JH
3196 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3197 options->prefix = NULL;
3198 if (options->prefix)
3199 options->prefix_length = strlen(options->prefix);
3200 else
3201 options->prefix_length = 0;
3202
c6744349
TH
3203 if (options->output_format & (DIFF_FORMAT_NAME |
3204 DIFF_FORMAT_NAME_STATUS |
3205 DIFF_FORMAT_CHECKDIFF |
3206 DIFF_FORMAT_NO_OUTPUT))
3207 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 3208 DIFF_FORMAT_NUMSTAT |
c6744349 3209 DIFF_FORMAT_DIFFSTAT |
ebd124c6 3210 DIFF_FORMAT_SHORTSTAT |
7df7c019 3211 DIFF_FORMAT_DIRSTAT |
c6744349
TH
3212 DIFF_FORMAT_SUMMARY |
3213 DIFF_FORMAT_PATCH);
3214
6973dcae
JH
3215 /*
3216 * These cases always need recursive; we do not drop caller-supplied
3217 * recursive bits for other formats here.
3218 */
c6744349 3219 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 3220 DIFF_FORMAT_NUMSTAT |
c6744349 3221 DIFF_FORMAT_DIFFSTAT |
ebd124c6 3222 DIFF_FORMAT_SHORTSTAT |
7df7c019 3223 DIFF_FORMAT_DIRSTAT |
d7014dc0 3224 DIFF_FORMAT_SUMMARY |
c6744349 3225 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 3226 DIFF_OPT_SET(options, RECURSIVE);
5e363541 3227 /*
3969cf7d 3228 * Also pickaxe would not work very well if you do not say recursive
5e363541 3229 */
3969cf7d 3230 if (options->pickaxe)
8f67f8ae 3231 DIFF_OPT_SET(options, RECURSIVE);
ae6d5c1b
JL
3232 /*
3233 * When patches are generated, submodules diffed against the work tree
3234 * must be checked for dirtiness too so it can be shown in the output
3235 */
3236 if (options->output_format & DIFF_FORMAT_PATCH)
3237 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
5e363541 3238
6973dcae
JH
3239 if (options->detect_rename && options->rename_limit < 0)
3240 options->rename_limit = diff_rename_limit_default;
3241 if (options->setup & DIFF_SETUP_USE_CACHE) {
3242 if (!active_cache)
3243 /* read-cache does not die even when it fails
3244 * so it is safe for us to do this here. Also
3245 * it does not smudge active_cache or active_nr
3246 * when it fails, so we do not have to worry about
3247 * cleaning it up ourselves either.
3248 */
3249 read_cache();
3250 }
6973dcae
JH
3251 if (options->abbrev <= 0 || 40 < options->abbrev)
3252 options->abbrev = 40; /* full */
3253
68aacb2f
JH
3254 /*
3255 * It does not make sense to show the first hit we happened
3256 * to have found. It does not make sense not to return with
3257 * exit code in such a case either.
3258 */
90b19941 3259 if (DIFF_OPT_TST(options, QUICK)) {
68aacb2f 3260 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 3261 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
3262 }
3263
6973dcae
JH
3264 return 0;
3265}
3266
d2543b8e 3267static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
3268{
3269 char c, *eq;
3270 int len;
3271
3272 if (*arg != '-')
3273 return 0;
3274 c = *++arg;
3275 if (!c)
3276 return 0;
3277 if (c == arg_short) {
3278 c = *++arg;
3279 if (!c)
3280 return 1;
3281 if (val && isdigit(c)) {
3282 char *end;
3283 int n = strtoul(arg, &end, 10);
3284 if (*end)
3285 return 0;
3286 *val = n;
3287 return 1;
3288 }
3289 return 0;
3290 }
3291 if (c != '-')
3292 return 0;
3293 arg++;
3294 eq = strchr(arg, '=');
3295 if (eq)
3296 len = eq - arg;
3297 else
3298 len = strlen(arg);
3299 if (!len || strncmp(arg, arg_long, len))
3300 return 0;
3301 if (eq) {
3302 int n;
3303 char *end;
3304 if (!isdigit(*++eq))
3305 return 0;
3306 n = strtoul(eq, &end, 10);
3307 if (*end)
3308 return 0;
3309 *val = n;
3310 }
3311 return 1;
3312}
3313
16befb8b
JH
3314static int diff_scoreopt_parse(const char *opt);
3315
dea007fb
MM
3316static inline int short_opt(char opt, const char **argv,
3317 const char **optarg)
3318{
3319 const char *arg = argv[0];
3320 if (arg[0] != '-' || arg[1] != opt)
3321 return 0;
3322 if (arg[2] != '\0') {
3323 *optarg = arg + 2;
3324 return 1;
3325 }
3326 if (!argv[1])
3327 die("Option '%c' requires a value", opt);
3328 *optarg = argv[1];
3329 return 2;
3330}
3331
3332int parse_long_opt(const char *opt, const char **argv,
3333 const char **optarg)
3334{
3335 const char *arg = argv[0];
3336 if (arg[0] != '-' || arg[1] != '-')
3337 return 0;
3338 arg += strlen("--");
3339 if (prefixcmp(arg, opt))
3340 return 0;
3341 arg += strlen(opt);
3342 if (*arg == '=') { /* sticked form: --option=value */
3343 *optarg = arg + 1;
3344 return 1;
3345 }
3346 if (*arg != '\0')
3347 return 0;
3348 /* separate form: --option value */
3349 if (!argv[1])
3350 die("Option '--%s' requires a value", opt);
3351 *optarg = argv[1];
3352 return 2;
3353}
3354
4d7f7a4a
JN
3355static int stat_opt(struct diff_options *options, const char **av)
3356{
3357 const char *arg = av[0];
3358 char *end;
3359 int width = options->stat_width;
3360 int name_width = options->stat_name_width;
969fe57b 3361 int graph_width = options->stat_graph_width;
808e1db2 3362 int count = options->stat_count;
1e57208e 3363 int argcount = 1;
4d7f7a4a
JN
3364
3365 arg += strlen("--stat");
3366 end = (char *)arg;
3367
3368 switch (*arg) {
3369 case '-':
1e57208e
MM
3370 if (!prefixcmp(arg, "-width")) {
3371 arg += strlen("-width");
3372 if (*arg == '=')
3373 width = strtoul(arg + 1, &end, 10);
3374 else if (!*arg && !av[1])
3375 die("Option '--stat-width' requires a value");
3376 else if (!*arg) {
3377 width = strtoul(av[1], &end, 10);
3378 argcount = 2;
3379 }
3380 } else if (!prefixcmp(arg, "-name-width")) {
3381 arg += strlen("-name-width");
3382 if (*arg == '=')
3383 name_width = strtoul(arg + 1, &end, 10);
3384 else if (!*arg && !av[1])
3385 die("Option '--stat-name-width' requires a value");
3386 else if (!*arg) {
3387 name_width = strtoul(av[1], &end, 10);
3388 argcount = 2;
3389 }
969fe57b
ZJS
3390 } else if (!prefixcmp(arg, "-graph-width")) {
3391 arg += strlen("-graph-width");
3392 if (*arg == '=')
3393 graph_width = strtoul(arg + 1, &end, 10);
3394 else if (!*arg && !av[1])
3395 die("Option '--stat-graph-width' requires a value");
3396 else if (!*arg) {
3397 graph_width = strtoul(av[1], &end, 10);
3398 argcount = 2;
3399 }
808e1db2
MG
3400 } else if (!prefixcmp(arg, "-count")) {
3401 arg += strlen("-count");
3402 if (*arg == '=')
3403 count = strtoul(arg + 1, &end, 10);
3404 else if (!*arg && !av[1])
3405 die("Option '--stat-count' requires a value");
3406 else if (!*arg) {
3407 count = strtoul(av[1], &end, 10);
3408 argcount = 2;
3409 }
1e57208e 3410 }
4d7f7a4a
JN
3411 break;
3412 case '=':
3413 width = strtoul(arg+1, &end, 10);
3414 if (*end == ',')
3415 name_width = strtoul(end+1, &end, 10);
808e1db2
MG
3416 if (*end == ',')
3417 count = strtoul(end+1, &end, 10);
4d7f7a4a
JN
3418 }
3419
3420 /* Important! This checks all the error cases! */
3421 if (*end)
3422 return 0;
3423 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3424 options->stat_name_width = name_width;
969fe57b 3425 options->stat_graph_width = graph_width;
4d7f7a4a 3426 options->stat_width = width;
808e1db2 3427 options->stat_count = count;
1e57208e 3428 return argcount;
4d7f7a4a
JN
3429}
3430
333f3fb0
JH
3431static int parse_dirstat_opt(struct diff_options *options, const char *params)
3432{
51670fc8
JH
3433 struct strbuf errmsg = STRBUF_INIT;
3434 if (parse_dirstat_params(options, params, &errmsg))
7478ac57 3435 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
51670fc8
JH
3436 errmsg.buf);
3437 strbuf_release(&errmsg);
333f3fb0
JH
3438 /*
3439 * The caller knows a dirstat-related option is given from the command
3440 * line; allow it to say "return this_function();"
3441 */
3442 options->output_format |= DIFF_FORMAT_DIRSTAT;
3443 return 1;
3444}
3445
6973dcae
JH
3446int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3447{
3448 const char *arg = av[0];
dea007fb
MM
3449 const char *optarg;
3450 int argcount;
d054680c
PH
3451
3452 /* Output format options */
1c9eecff 3453 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
c6744349 3454 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 3455 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 3456 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
3457 else if (!strcmp(arg, "--raw"))
3458 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 3459 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 3460 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 3461 else if (!strcmp(arg, "--numstat"))
74e2abe5 3462 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 3463 else if (!strcmp(arg, "--shortstat"))
ebd124c6 3464 options->output_format |= DIFF_FORMAT_SHORTSTAT;
333f3fb0
JH
3465 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3466 return parse_dirstat_opt(options, "");
3467 else if (!prefixcmp(arg, "-X"))
3468 return parse_dirstat_opt(options, arg + 2);
3469 else if (!prefixcmp(arg, "--dirstat="))
3470 return parse_dirstat_opt(options, arg + 10);
3471 else if (!strcmp(arg, "--cumulative"))
3472 return parse_dirstat_opt(options, "cumulative");
3473 else if (!strcmp(arg, "--dirstat-by-file"))
3474 return parse_dirstat_opt(options, "files");
3475 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3476 parse_dirstat_opt(options, "files");
3477 return parse_dirstat_opt(options, arg + 18);
f88d225f 3478 }
d054680c
PH
3479 else if (!strcmp(arg, "--check"))
3480 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3481 else if (!strcmp(arg, "--summary"))
3482 options->output_format |= DIFF_FORMAT_SUMMARY;
3483 else if (!strcmp(arg, "--patch-with-stat"))
3484 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3485 else if (!strcmp(arg, "--name-only"))
3486 options->output_format |= DIFF_FORMAT_NAME;
3487 else if (!strcmp(arg, "--name-status"))
3488 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3489 else if (!strcmp(arg, "-s"))
3490 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4d7f7a4a 3491 else if (!prefixcmp(arg, "--stat"))
808e1db2 3492 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4d7f7a4a 3493 return stat_opt(options, av);
d054680c
PH
3494
3495 /* renames options */
37ab5156
KB
3496 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3497 !strcmp(arg, "--break-rewrites")) {
8f67f8ae 3498 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
07cd7265 3499 return error("invalid argument to -B: %s", arg+2);
6973dcae 3500 }
f611ddc7
YD
3501 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3502 !strcmp(arg, "--find-renames")) {
8f67f8ae 3503 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
07cd7265 3504 return error("invalid argument to -M: %s", arg+2);
6973dcae
JH
3505 options->detect_rename = DIFF_DETECT_RENAME;
3506 }
467ddc14
JH
3507 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3508 options->irreversible_delete = 1;
3509 }
f611ddc7
YD
3510 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3511 !strcmp(arg, "--find-copies")) {
ca6c0970 3512 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
3513 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3514 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
07cd7265 3515 return error("invalid argument to -C: %s", arg+2);
6973dcae
JH
3516 options->detect_rename = DIFF_DETECT_COPY;
3517 }
d054680c
PH
3518 else if (!strcmp(arg, "--no-renames"))
3519 options->detect_rename = 0;
90d43b07
JK
3520 else if (!strcmp(arg, "--rename-empty"))
3521 DIFF_OPT_SET(options, RENAME_EMPTY);
3522 else if (!strcmp(arg, "--no-rename-empty"))
3523 DIFF_OPT_CLR(options, RENAME_EMPTY);
cd676a51
JH
3524 else if (!strcmp(arg, "--relative"))
3525 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
3526 else if (!prefixcmp(arg, "--relative=")) {
3527 DIFF_OPT_SET(options, RELATIVE_NAME);
3528 options->prefix = arg + 11;
3529 }
d054680c
PH
3530
3531 /* xdiff options */
81b568c8
JH
3532 else if (!strcmp(arg, "--minimal"))
3533 DIFF_XDL_SET(options, NEED_MINIMAL);
3534 else if (!strcmp(arg, "--no-minimal"))
3535 DIFF_XDL_CLR(options, NEED_MINIMAL);
d054680c 3536 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
628d5c2b 3537 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
d054680c 3538 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
628d5c2b 3539 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
d054680c 3540 else if (!strcmp(arg, "--ignore-space-at-eol"))
628d5c2b 3541 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
34292bdd 3542 else if (!strcmp(arg, "--patience"))
307ab20b 3543 options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
8c912eea 3544 else if (!strcmp(arg, "--histogram"))
307ab20b 3545 options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
d054680c
PH
3546
3547 /* flags options */
3548 else if (!strcmp(arg, "--binary")) {
3549 options->output_format |= DIFF_FORMAT_PATCH;
3550 DIFF_OPT_SET(options, BINARY);
3551 }
3552 else if (!strcmp(arg, "--full-index"))
3553 DIFF_OPT_SET(options, FULL_INDEX);
3554 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3555 DIFF_OPT_SET(options, TEXT);
3556 else if (!strcmp(arg, "-R"))
3557 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 3558 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 3559 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 3560 else if (!strcmp(arg, "--follow"))
8f67f8ae 3561 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 3562 else if (!strcmp(arg, "--color"))
f1c96261 3563 options->use_color = 1;
73e9da01 3564 else if (!prefixcmp(arg, "--color=")) {
e269eb79 3565 int value = git_config_colorbool(NULL, arg+8);
daa0c3d9 3566 if (value < 0)
73e9da01 3567 return error("option `color' expects \"always\", \"auto\", or \"never\"");
daa0c3d9 3568 options->use_color = value;
73e9da01 3569 }
fef88bb0 3570 else if (!strcmp(arg, "--no-color"))
f1c96261 3571 options->use_color = 0;
628d5c2b 3572 else if (!strcmp(arg, "--color-words")) {
f1c96261 3573 options->use_color = 1;
882749a0 3574 options->word_diff = DIFF_WORDS_COLOR;
628d5c2b 3575 }
2b6a5417 3576 else if (!prefixcmp(arg, "--color-words=")) {
f1c96261 3577 options->use_color = 1;
882749a0 3578 options->word_diff = DIFF_WORDS_COLOR;
2b6a5417
JS
3579 options->word_regex = arg + 14;
3580 }
882749a0
TR
3581 else if (!strcmp(arg, "--word-diff")) {
3582 if (options->word_diff == DIFF_WORDS_NONE)
3583 options->word_diff = DIFF_WORDS_PLAIN;
3584 }
3585 else if (!prefixcmp(arg, "--word-diff=")) {
3586 const char *type = arg + 12;
3587 if (!strcmp(type, "plain"))
3588 options->word_diff = DIFF_WORDS_PLAIN;
3589 else if (!strcmp(type, "color")) {