Git 1.7.9
[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;
712d2c7d 34static int diff_dirstat_permille_default = 30;
be4f2b40 35static struct diff_options default_diff_options;
6973dcae 36
7c92fe0e 37static char diff_colors[][COLOR_MAXLEN] = {
dc6ebd4c
AL
38 GIT_COLOR_RESET,
39 GIT_COLOR_NORMAL, /* PLAIN */
40 GIT_COLOR_BOLD, /* METAINFO */
41 GIT_COLOR_CYAN, /* FRAGINFO */
42 GIT_COLOR_RED, /* OLD */
43 GIT_COLOR_GREEN, /* NEW */
44 GIT_COLOR_YELLOW, /* COMMIT */
45 GIT_COLOR_BG_RED, /* WHITESPACE */
89cb73a1 46 GIT_COLOR_NORMAL, /* FUNCINFO */
cd112cef
JS
47};
48
801235c5
JH
49static int parse_diff_color_slot(const char *var, int ofs)
50{
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
ce436973
JK
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
448c3ef1
JH
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
89cb73a1
BW
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
8b8e8624 67 return -1;
801235c5
JH
68}
69
51670fc8
JH
70static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
333f3fb0
JH
72{
73 const char *p = params;
51670fc8
JH
74 int p_len, ret = 0;
75
333f3fb0 76 while (*p) {
51670fc8
JH
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
1c57a627
JH
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
51670fc8 81 } else if (!memcmp(p, "lines", p_len)) {
1c57a627 82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
333f3fb0 83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
51670fc8 84 } else if (!memcmp(p, "files", p_len)) {
1c57a627 85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
333f3fb0 86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
51670fc8 87 } else if (!memcmp(p, "noncumulative", p_len)) {
333f3fb0 88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
51670fc8 89 } else if (!memcmp(p, "cumulative", p_len)) {
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JH
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
51670fc8
JH
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
712d2c7d 95 /* only use first digit */
51670fc8 96 permille += *end - '0';
712d2c7d 97 /* .. and ignore any further digits */
51670fc8 98 while (isdigit(*++end))
712d2c7d
JH
99 ; /* nothing */
100 }
51670fc8
JH
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
7478ac57 104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
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105 p_len, p);
106 ret++;
107 }
108 } else {
7478ac57 109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
51670fc8
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110 p_len, p);
111 ret++;
333f3fb0 112 }
51670fc8
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113
114 p += p_len;
115
116 if (*p)
117 p++; /* more parameters, swallow separator */
333f3fb0 118 }
51670fc8 119 return ret;
333f3fb0
JH
120}
121
cced5fbc
LT
122static int git_config_rename(const char *var, const char *value)
123{
124 if (!value)
125 return DIFF_DETECT_RENAME;
126 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
127 return DIFF_DETECT_COPY;
128 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
129}
130
83ad63cf
JH
131/*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
ef90d6d4 137int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 138{
a159ca0c 139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
e269eb79 140 diff_use_color_default = git_config_colorbool(var, value);
801235c5
JH
141 return 0;
142 }
b68ea12e 143 if (!strcmp(var, "diff.renames")) {
cced5fbc 144 diff_detect_rename_default = git_config_rename(var, value);
b68ea12e
EW
145 return 0;
146 }
aecbf914
JH
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
a5a818ee
JH
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
f89504dd
EC
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
daec808c
BH
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
98a4d87b
BSSJ
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
f1af60bd 163
be4f2b40
JS
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166
3e1dd17a
JK
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
169
ef90d6d4 170 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
171}
172
ef90d6d4 173int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 174{
2b6ca6df
LT
175 if (!strcmp(var, "diff.renamelimit")) {
176 diff_rename_limit_default = git_config_int(var, value);
177 return 0;
178 }
179
c7534ef4
JK
180 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
185
1968d77d 186 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 187 int slot = parse_diff_color_slot(var, 11);
8b8e8624
JK
188 if (slot < 0)
189 return 0;
64f30e94
JH
190 if (!value)
191 return config_error_nonbool(var);
7c92fe0e 192 color_parse(value, var, diff_colors[slot]);
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193 return 0;
194 }
f1af60bd 195
a624eaa7 196 /* like GNU diff's --suppress-blank-empty option */
950db879
JS
197 if (!strcmp(var, "diff.suppressblankempty") ||
198 /* for backwards compatibility */
199 !strcmp(var, "diff.suppress-blank-empty")) {
a624eaa7
JM
200 diff_suppress_blank_empty = git_config_bool(var, value);
201 return 0;
202 }
203
2d174951 204 if (!strcmp(var, "diff.dirstat")) {
51670fc8 205 struct strbuf errmsg = STRBUF_INIT;
712d2c7d 206 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
51670fc8 207 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
7478ac57 208 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
51670fc8
JH
209 errmsg.buf);
210 strbuf_release(&errmsg);
712d2c7d 211 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
2d174951
JH
212 return 0;
213 }
214
aee9c7d6
JL
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
217
3e1dd17a 218 return git_default_config(var, value, cb);
801235c5
JH
219}
220
6973dcae
JH
221static char *quote_two(const char *one, const char *two)
222{
223 int need_one = quote_c_style(one, NULL, NULL, 1);
224 int need_two = quote_c_style(two, NULL, NULL, 1);
f285a2d7 225 struct strbuf res = STRBUF_INIT;
6973dcae
JH
226
227 if (need_one + need_two) {
663af342
PH
228 strbuf_addch(&res, '"');
229 quote_c_style(one, &res, NULL, 1);
230 quote_c_style(two, &res, NULL, 1);
231 strbuf_addch(&res, '"');
232 } else {
233 strbuf_addstr(&res, one);
234 strbuf_addstr(&res, two);
6973dcae 235 }
b315c5c0 236 return strbuf_detach(&res, NULL);
6973dcae
JH
237}
238
239static const char *external_diff(void)
240{
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
243
244 if (done_preparing)
245 return external_diff_cmd;
246 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
cbe02100
JS
247 if (!external_diff_cmd)
248 external_diff_cmd = external_diff_cmd_cfg;
6973dcae
JH
249 done_preparing = 1;
250 return external_diff_cmd;
251}
252
6973dcae
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253static struct diff_tempfile {
254 const char *name; /* filename external diff should read from */
255 char hex[41];
256 char mode[10];
1472966c 257 char tmp_path[PATH_MAX];
6973dcae
JH
258} diff_temp[2];
259
6957eb9a
JH
260typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
261
262struct emit_callback {
6957eb9a
JH
263 int color_diff;
264 unsigned ws_rule;
265 int blank_at_eof_in_preimage;
266 int blank_at_eof_in_postimage;
267 int lno_in_preimage;
268 int lno_in_postimage;
269 sane_truncate_fn truncate;
270 const char **label_path;
271 struct diff_words_data *diff_words;
a3c158d4 272 struct diff_options *opt;
6957eb9a 273 int *found_changesp;
3e97c7c6 274 struct strbuf *header;
6957eb9a
JH
275};
276
6973dcae
JH
277static int count_lines(const char *data, int size)
278{
279 int count, ch, completely_empty = 1, nl_just_seen = 0;
280 count = 0;
281 while (0 < size--) {
282 ch = *data++;
283 if (ch == '\n') {
284 count++;
285 nl_just_seen = 1;
286 completely_empty = 0;
287 }
288 else {
289 nl_just_seen = 0;
290 completely_empty = 0;
291 }
292 }
293 if (completely_empty)
294 return 0;
295 if (!nl_just_seen)
296 count++; /* no trailing newline */
297 return count;
298}
299
6957eb9a
JH
300static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
301{
302 if (!DIFF_FILE_VALID(one)) {
303 mf->ptr = (char *)""; /* does not matter */
304 mf->size = 0;
305 return 0;
306 }
307 else if (diff_populate_filespec(one, 0))
308 return -1;
bb35fefb 309
6957eb9a
JH
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313}
314
abb371a1
JK
315/* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316static unsigned long diff_filespec_size(struct diff_filespec *one)
317{
318 if (!DIFF_FILE_VALID(one))
319 return 0;
320 diff_populate_filespec(one, 1);
321 return one->size;
322}
323
6957eb9a
JH
324static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
325{
326 char *ptr = mf->ptr;
327 long size = mf->size;
328 int cnt = 0;
329
330 if (!size)
331 return cnt;
332 ptr += size - 1; /* pointing at the very end */
333 if (*ptr != '\n')
334 ; /* incomplete line */
335 else
336 ptr--; /* skip the last LF */
337 while (mf->ptr < ptr) {
338 char *prev_eol;
339 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
340 if (*prev_eol == '\n')
341 break;
342 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
343 break;
344 cnt++;
345 ptr = prev_eol - 1;
346 }
347 return cnt;
348}
349
350static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
351 struct emit_callback *ecbdata)
352{
353 int l1, l2, at;
354 unsigned ws_rule = ecbdata->ws_rule;
355 l1 = count_trailing_blank(mf1, ws_rule);
356 l2 = count_trailing_blank(mf2, ws_rule);
357 if (l2 <= l1) {
358 ecbdata->blank_at_eof_in_preimage = 0;
359 ecbdata->blank_at_eof_in_postimage = 0;
360 return;
361 }
362 at = count_lines(mf1->ptr, mf1->size);
363 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
364
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367}
368
a3c158d4 369static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
250f7993 370 int first, const char *line, int len)
6957eb9a
JH
371{
372 int has_trailing_newline, has_trailing_carriage_return;
250f7993 373 int nofirst;
a3c158d4
BY
374 FILE *file = o->file;
375
376 if (o->output_prefix) {
377 struct strbuf *msg = NULL;
378 msg = o->output_prefix(o, o->output_prefix_data);
379 assert(msg);
380 fwrite(msg->buf, msg->len, 1, file);
381 }
6957eb9a 382
250f7993
JH
383 if (len == 0) {
384 has_trailing_newline = (first == '\n');
385 has_trailing_carriage_return = (!has_trailing_newline &&
386 (first == '\r'));
387 nofirst = has_trailing_newline || has_trailing_carriage_return;
388 } else {
389 has_trailing_newline = (len > 0 && line[len-1] == '\n');
390 if (has_trailing_newline)
391 len--;
392 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
393 if (has_trailing_carriage_return)
394 len--;
395 nofirst = 0;
396 }
6957eb9a 397
06a47552
JH
398 if (len || !nofirst) {
399 fputs(set, file);
400 if (!nofirst)
401 fputc(first, file);
402 fwrite(line, len, 1, file);
403 fputs(reset, file);
404 }
6957eb9a
JH
405 if (has_trailing_carriage_return)
406 fputc('\r', file);
407 if (has_trailing_newline)
408 fputc('\n', file);
409}
410
a3c158d4 411static void emit_line(struct diff_options *o, const char *set, const char *reset,
250f7993
JH
412 const char *line, int len)
413{
a3c158d4 414 emit_line_0(o, set, reset, line[0], line+1, len-1);
250f7993
JH
415}
416
6957eb9a
JH
417static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
418{
419 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
420 ecbdata->blank_at_eof_in_preimage &&
421 ecbdata->blank_at_eof_in_postimage &&
422 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
424 return 0;
018cff70 425 return ws_blank_line(line, len, ecbdata->ws_rule);
6957eb9a
JH
426}
427
018cff70
JH
428static void emit_add_line(const char *reset,
429 struct emit_callback *ecbdata,
430 const char *line, int len)
6957eb9a
JH
431{
432 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
433 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
434
435 if (!*ws)
a3c158d4 436 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
6957eb9a
JH
437 else if (new_blank_line_at_eof(ecbdata, line, len))
438 /* Blank line at EOF - paint '+' as well */
a3c158d4 439 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
6957eb9a
JH
440 else {
441 /* Emit just the prefix, then the rest. */
a3c158d4 442 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
018cff70 443 ws_check_emit(line, len, ecbdata->ws_rule,
a3c158d4 444 ecbdata->opt->file, set, reset, ws);
6957eb9a
JH
445 }
446}
447
89cb73a1
BW
448static void emit_hunk_header(struct emit_callback *ecbdata,
449 const char *line, int len)
450{
451 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
452 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
453 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
454 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
455 static const char atat[2] = { '@', '@' };
456 const char *cp, *ep;
2efcc977
BY
457 struct strbuf msgbuf = STRBUF_INIT;
458 int org_len = len;
459 int i = 1;
89cb73a1
BW
460
461 /*
462 * As a hunk header must begin with "@@ -<old>, +<new> @@",
463 * it always is at least 10 bytes long.
464 */
465 if (len < 10 ||
466 memcmp(line, atat, 2) ||
467 !(ep = memmem(line + 2, len - 2, atat, 2))) {
a3c158d4 468 emit_line(ecbdata->opt, plain, reset, line, len);
89cb73a1
BW
469 return;
470 }
471 ep += 2; /* skip over @@ */
472
473 /* The hunk header in fraginfo color */
2efcc977
BY
474 strbuf_add(&msgbuf, frag, strlen(frag));
475 strbuf_add(&msgbuf, line, ep - line);
476 strbuf_add(&msgbuf, reset, strlen(reset));
477
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
89cb73a1
BW
484
485 /* blank before the func header */
486 for (cp = ep; ep - line < len; ep++)
487 if (*ep != ' ' && *ep != '\t')
488 break;
2efcc977
BY
489 if (ep != cp) {
490 strbuf_add(&msgbuf, plain, strlen(plain));
491 strbuf_add(&msgbuf, cp, ep - cp);
492 strbuf_add(&msgbuf, reset, strlen(reset));
493 }
494
495 if (ep < line + len) {
496 strbuf_add(&msgbuf, func, strlen(func));
497 strbuf_add(&msgbuf, ep, line + len - ep);
498 strbuf_add(&msgbuf, reset, strlen(reset));
499 }
89cb73a1 500
2efcc977
BY
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
89cb73a1
BW
504}
505
479b0ae8
JK
506static struct diff_tempfile *claim_diff_tempfile(void) {
507 int i;
508 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
509 if (!diff_temp[i].name)
510 return diff_temp + i;
511 die("BUG: diff is failing to clean up its tempfiles");
512}
513
514static int remove_tempfile_installed;
515
516static void remove_tempfile(void)
517{
518 int i;
a8344abe
NR
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
520 if (diff_temp[i].name == diff_temp[i].tmp_path)
691f1a28 521 unlink_or_warn(diff_temp[i].name);
a8344abe
NR
522 diff_temp[i].name = NULL;
523 }
479b0ae8
JK
524}
525
526static void remove_tempfile_on_signal(int signo)
527{
528 remove_tempfile();
4a16d072 529 sigchain_pop(signo);
479b0ae8
JK
530 raise(signo);
531}
532
c0c77734 533static void print_line_count(FILE *file, int count)
6973dcae
JH
534{
535 switch (count) {
536 case 0:
c0c77734 537 fprintf(file, "0,0");
6973dcae
JH
538 break;
539 case 1:
c0c77734 540 fprintf(file, "1");
6973dcae
JH
541 break;
542 default:
c0c77734 543 fprintf(file, "1,%d", count);
6973dcae
JH
544 break;
545 }
546}
547
7f7ee2ff
JH
548static void emit_rewrite_lines(struct emit_callback *ecb,
549 int prefix, const char *data, int size)
6973dcae 550{
7f7ee2ff
JH
551 const char *endp = NULL;
552 static const char *nneof = " No newline at end of file\n";
553 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
554 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
555
556 while (0 < size) {
557 int len;
558
559 endp = memchr(data, '\n', size);
560 len = endp ? (endp - data + 1) : size;
561 if (prefix != '+') {
562 ecb->lno_in_preimage++;
a3c158d4 563 emit_line_0(ecb->opt, old, reset, '-',
7f7ee2ff
JH
564 data, len);
565 } else {
566 ecb->lno_in_postimage++;
567 emit_add_line(reset, ecb, data, len);
13e36ec5 568 }
7f7ee2ff
JH
569 size -= len;
570 data += len;
571 }
572 if (!endp) {
573 const char *plain = diff_get_color(ecb->color_diff,
574 DIFF_PLAIN);
a3c158d4 575 emit_line_0(ecb->opt, plain, reset, '\\',
7f7ee2ff 576 nneof, strlen(nneof));
6973dcae 577 }
6973dcae
JH
578}
579
580static void emit_rewrite_diff(const char *name_a,
581 const char *name_b,
582 struct diff_filespec *one,
13e36ec5 583 struct diff_filespec *two,
d9bae1a1
JK
584 struct userdiff_driver *textconv_one,
585 struct userdiff_driver *textconv_two,
eab9a40b 586 struct diff_options *o)
6973dcae
JH
587{
588 int lc_a, lc_b;
1a9eb3b9 589 const char *name_a_tab, *name_b_tab;
f1c96261
JK
590 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
591 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
592 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
d5625091 593 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
a5a818ee 594 const char *a_prefix, *b_prefix;
840383b2 595 char *data_one, *data_two;
3aa1f7ca 596 size_t size_one, size_two;
7f7ee2ff 597 struct emit_callback ecbdata;
7be57610
BY
598 char *line_prefix = "";
599 struct strbuf *msgbuf;
600
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
a5a818ee
JH
605
606 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
607 a_prefix = o->b_prefix;
608 b_prefix = o->a_prefix;
609 } else {
610 a_prefix = o->a_prefix;
611 b_prefix = o->b_prefix;
612 }
1a9eb3b9 613
8a13becc
JH
614 name_a += (*name_a == '/');
615 name_b += (*name_b == '/');
1a9eb3b9
JH
616 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
617 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
618
d5625091
JH
619 strbuf_reset(&a_name);
620 strbuf_reset(&b_name);
a5a818ee
JH
621 quote_two_c_style(&a_name, a_prefix, name_a, 0);
622 quote_two_c_style(&b_name, b_prefix, name_b, 0);
d5625091 623
840383b2
JK
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
3aa1f7ca 626
d91ba8fa 627 memset(&ecbdata, 0, sizeof(ecbdata));
daa0c3d9 628 ecbdata.color_diff = want_color(o->use_color);
d91ba8fa
JH
629 ecbdata.found_changesp = &o->found_changes;
630 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
a3c158d4 631 ecbdata.opt = o;
d91ba8fa
JH
632 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
633 mmfile_t mf1, mf2;
634 mf1.ptr = (char *)data_one;
635 mf2.ptr = (char *)data_two;
636 mf1.size = size_one;
637 mf2.size = size_two;
638 check_blank_at_eof(&mf1, &mf2, &ecbdata);
639 }
640 ecbdata.lno_in_preimage = 1;
641 ecbdata.lno_in_postimage = 1;
642
3aa1f7ca
JK
643 lc_a = count_lines(data_one, size_one);
644 lc_b = count_lines(data_two, size_two);
c0c77734 645 fprintf(o->file,
7be57610
BY
646 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
647 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
648 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
649 line_prefix, fraginfo);
467ddc14
JH
650 if (!o->irreversible_delete)
651 print_line_count(o->file, lc_a);
652 else
653 fprintf(o->file, "?,?");
c0c77734
DB
654 fprintf(o->file, " +");
655 print_line_count(o->file, lc_b);
656 fprintf(o->file, " @@%s\n", reset);
467ddc14 657 if (lc_a && !o->irreversible_delete)
d91ba8fa 658 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
6973dcae 659 if (lc_b)
d91ba8fa 660 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
b76c056b 661 if (textconv_one)
aed6ca52 662 free((char *)data_one);
b76c056b 663 if (textconv_two)
aed6ca52 664 free((char *)data_two);
6973dcae
JH
665}
666
f59a59e2
JS
667struct diff_words_buffer {
668 mmfile_t text;
669 long alloc;
2e5d2003
JS
670 struct diff_words_orig {
671 const char *begin, *end;
672 } *orig;
673 int orig_nr, orig_alloc;
f59a59e2
JS
674};
675
676static void diff_words_append(char *line, unsigned long len,
677 struct diff_words_buffer *buffer)
678{
23c1575f 679 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
f59a59e2
JS
680 line++;
681 len--;
682 memcpy(buffer->text.ptr + buffer->text.size, line, len);
683 buffer->text.size += len;
2b6a5417 684 buffer->text.ptr[buffer->text.size] = '\0';
f59a59e2
JS
685}
686
9cba13ca 687struct diff_words_style_elem {
882749a0
TR
688 const char *prefix;
689 const char *suffix;
690 const char *color; /* NULL; filled in by the setup code if
691 * color is enabled */
692};
693
9cba13ca 694struct diff_words_style {
882749a0
TR
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698};
699
c2e86add 700static struct diff_words_style diff_words_styles[] = {
882749a0
TR
701 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
702 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
703 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
704};
705
f59a59e2 706struct diff_words_data {
f59a59e2 707 struct diff_words_buffer minus, plus;
2e5d2003 708 const char *current_plus;
4297c0ae
BY
709 int last_minus;
710 struct diff_options *opt;
2b6a5417 711 regex_t *word_regex;
882749a0
TR
712 enum diff_words_type type;
713 struct diff_words_style *style;
f59a59e2
JS
714};
715
882749a0
TR
716static int fn_out_diff_words_write_helper(FILE *fp,
717 struct diff_words_style_elem *st_el,
718 const char *newline,
4297c0ae
BY
719 size_t count, const char *buf,
720 const char *line_prefix)
882749a0 721{
4297c0ae
BY
722 int print = 0;
723
882749a0
TR
724 while (count) {
725 char *p = memchr(buf, '\n', count);
4297c0ae
BY
726 if (print)
727 fputs(line_prefix, fp);
882749a0
TR
728 if (p != buf) {
729 if (st_el->color && fputs(st_el->color, fp) < 0)
730 return -1;
731 if (fputs(st_el->prefix, fp) < 0 ||
732 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
733 fputs(st_el->suffix, fp) < 0)
734 return -1;
735 if (st_el->color && *st_el->color
736 && fputs(GIT_COLOR_RESET, fp) < 0)
737 return -1;
738 }
739 if (!p)
740 return 0;
741 if (fputs(newline, fp) < 0)
742 return -1;
743 count -= p + 1 - buf;
744 buf = p + 1;
4297c0ae 745 print = 1;
882749a0
TR
746 }
747 return 0;
748}
749
4297c0ae
BY
750/*
751 * '--color-words' algorithm can be described as:
752 *
753 * 1. collect a the minus/plus lines of a diff hunk, divided into
754 * minus-lines and plus-lines;
755 *
756 * 2. break both minus-lines and plus-lines into words and
757 * place them into two mmfile_t with one word for each line;
758 *
759 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
760 *
761 * And for the common parts of the both file, we output the plus side text.
762 * diff_words->current_plus is used to trace the current position of the plus file
763 * which printed. diff_words->last_minus is used to trace the last minus word
764 * printed.
765 *
766 * For '--graph' to work with '--color-words', we need to output the graph prefix
767 * on each line of color words output. Generally, there are two conditions on
768 * which we should output the prefix.
769 *
770 * 1. diff_words->last_minus == 0 &&
771 * diff_words->current_plus == diff_words->plus.text.ptr
772 *
773 * that is: the plus text must start as a new line, and if there is no minus
774 * word printed, a graph prefix must be printed.
775 *
776 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
777 * *(diff_words->current_plus - 1) == '\n'
778 *
779 * that is: a graph prefix must be printed following a '\n'
780 */
781static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
782{
783 if ((diff_words->last_minus == 0 &&
784 diff_words->current_plus == diff_words->plus.text.ptr) ||
785 (diff_words->current_plus > diff_words->plus.text.ptr &&
786 *(diff_words->current_plus - 1) == '\n')) {
787 return 1;
788 } else {
789 return 0;
790 }
791}
792
f59a59e2 793static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
f59a59e2 794{
f59a59e2 795 struct diff_words_data *diff_words = priv;
882749a0 796 struct diff_words_style *style = diff_words->style;
2e5d2003
JS
797 int minus_first, minus_len, plus_first, plus_len;
798 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
4297c0ae
BY
799 struct diff_options *opt = diff_words->opt;
800 struct strbuf *msgbuf;
801 char *line_prefix = "";
f59a59e2 802
2e5d2003
JS
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
f59a59e2
JS
805 return;
806
4297c0ae
BY
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
812
2e5d2003
JS
813 /* POSIX requires that first be decremented by one if len == 0... */
814 if (minus_len) {
815 minus_begin = diff_words->minus.orig[minus_first].begin;
816 minus_end =
817 diff_words->minus.orig[minus_first + minus_len - 1].end;
818 } else
819 minus_begin = minus_end =
820 diff_words->minus.orig[minus_first].end;
821
822 if (plus_len) {
823 plus_begin = diff_words->plus.orig[plus_first].begin;
824 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
825 } else
826 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
827
4297c0ae
BY
828 if (color_words_output_graph_prefix(diff_words)) {
829 fputs(line_prefix, diff_words->opt->file);
830 }
831 if (diff_words->current_plus != plus_begin) {
832 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0
TR
833 &style->ctx, style->newline,
834 plus_begin - diff_words->current_plus,
4297c0ae
BY
835 diff_words->current_plus, line_prefix);
836 if (*(plus_begin - 1) == '\n')
837 fputs(line_prefix, diff_words->opt->file);
838 }
839 if (minus_begin != minus_end) {
840 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 841 &style->old, style->newline,
4297c0ae
BY
842 minus_end - minus_begin, minus_begin,
843 line_prefix);
844 }
845 if (plus_begin != plus_end) {
846 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 847 &style->new, style->newline,
4297c0ae
BY
848 plus_end - plus_begin, plus_begin,
849 line_prefix);
850 }
2e5d2003
JS
851
852 diff_words->current_plus = plus_end;
4297c0ae 853 diff_words->last_minus = minus_first;
f59a59e2
JS
854}
855
2b6a5417
JS
856/* This function starts looking at *begin, and returns 0 iff a word was found. */
857static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
858 int *begin, int *end)
859{
860 if (word_regex && *begin < buffer->size) {
861 regmatch_t match[1];
862 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
863 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
864 '\n', match[0].rm_eo - match[0].rm_so);
865 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
866 *begin += match[0].rm_so;
867 return *begin >= *end;
868 }
869 return -1;
f59a59e2
JS
870 }
871
2b6a5417
JS
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
f59a59e2 877
2b6a5417
JS
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
882
883 return 0;
f59a59e2
JS
884}
885
23c1575f 886/*
2e5d2003
JS
887 * This function splits the words in buffer->text, stores the list with
888 * newline separator into out, and saves the offsets of the original words
889 * in buffer->orig.
23c1575f 890 */
2b6a5417
JS
891static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
892 regex_t *word_regex)
f59a59e2 893{
2e5d2003 894 int i, j;
2b6a5417 895 long alloc = 0;
f59a59e2 896
2e5d2003 897 out->size = 0;
2b6a5417 898 out->ptr = NULL;
f59a59e2 899
2e5d2003
JS
900 /* fake an empty "0th" word */
901 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
902 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
903 buffer->orig_nr = 1;
904
905 for (i = 0; i < buffer->text.size; i++) {
2b6a5417
JS
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
2e5d2003
JS
908
909 /* store original boundaries */
910 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
911 buffer->orig_alloc);
912 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
913 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
914 buffer->orig_nr++;
915
916 /* store one word */
2b6a5417 917 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
2e5d2003
JS
918 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
919 out->ptr[out->size + j - i] = '\n';
920 out->size += j - i + 1;
921
922 i = j - 1;
f59a59e2
JS
923 }
924}
925
926/* this executes the word diff on the accumulated buffers */
927static void diff_words_show(struct diff_words_data *diff_words)
928{
929 xpparam_t xpp;
930 xdemitconf_t xecfg;
f59a59e2 931 mmfile_t minus, plus;
882749a0 932 struct diff_words_style *style = diff_words->style;
f59a59e2 933
4297c0ae
BY
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
937
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
943
2e5d2003
JS
944 /* special case: only removal */
945 if (!diff_words->plus.text.size) {
4297c0ae
BY
946 fputs(line_prefix, diff_words->opt->file);
947 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 948 &style->old, style->newline,
4297c0ae
BY
949 diff_words->minus.text.size,
950 diff_words->minus.text.ptr, line_prefix);
2e5d2003
JS
951 diff_words->minus.text.size = 0;
952 return;
953 }
954
955 diff_words->current_plus = diff_words->plus.text.ptr;
4297c0ae 956 diff_words->last_minus = 0;
f59a59e2 957
9ccd0a88 958 memset(&xpp, 0, sizeof(xpp));
30b25010 959 memset(&xecfg, 0, sizeof(xecfg));
2b6a5417
JS
960 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
961 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
582aa00b 962 xpp.flags = 0;
2b6a5417 963 /* as only the hunk header will be parsed, we need a 0-context */
2e5d2003 964 xecfg.ctxlen = 0;
8a3f524b 965 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
dfea7900 966 &xpp, &xecfg);
f59a59e2
JS
967 free(minus.ptr);
968 free(plus.ptr);
2e5d2003 969 if (diff_words->current_plus != diff_words->plus.text.ptr +
4297c0ae
BY
970 diff_words->plus.text.size) {
971 if (color_words_output_graph_prefix(diff_words))
972 fputs(line_prefix, diff_words->opt->file);
973 fn_out_diff_words_write_helper(diff_words->opt->file,
882749a0 974 &style->ctx, style->newline,
2e5d2003 975 diff_words->plus.text.ptr + diff_words->plus.text.size
4297c0ae
BY
976 - diff_words->current_plus, diff_words->current_plus,
977 line_prefix);
978 }
f59a59e2 979 diff_words->minus.text.size = diff_words->plus.text.size = 0;
f59a59e2
JS
980}
981
76fd2828
JH
982/* In "color-words" mode, show word-diff of words accumulated in the buffer */
983static void diff_words_flush(struct emit_callback *ecbdata)
984{
985 if (ecbdata->diff_words->minus.text.size ||
986 ecbdata->diff_words->plus.text.size)
987 diff_words_show(ecbdata->diff_words);
988}
989
f59a59e2
JS
990static void free_diff_words_data(struct emit_callback *ecbdata)
991{
992 if (ecbdata->diff_words) {
76fd2828 993 diff_words_flush(ecbdata);
8e0f7003 994 free (ecbdata->diff_words->minus.text.ptr);
2e5d2003 995 free (ecbdata->diff_words->minus.orig);
8e0f7003 996 free (ecbdata->diff_words->plus.text.ptr);
2e5d2003 997 free (ecbdata->diff_words->plus.orig);
ef5644ea
BC
998 if (ecbdata->diff_words->word_regex) {
999 regfree(ecbdata->diff_words->word_regex);
1000 free(ecbdata->diff_words->word_regex);
1001 }
f59a59e2
JS
1002 free(ecbdata->diff_words);
1003 ecbdata->diff_words = NULL;
1004 }
1005}
1006
ce436973 1007const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef 1008{
daa0c3d9 1009 if (want_color(diff_use_color))
50f575fc
LT
1010 return diff_colors[ix];
1011 return "";
cd112cef
JS
1012}
1013
23707811
JH
1014static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1015{
1016 const char *cp;
1017 unsigned long allot;
1018 size_t l = len;
1019
1020 if (ecb->truncate)
1021 return ecb->truncate(line, len);
1022 cp = line;
1023 allot = l;
1024 while (0 < l) {
1025 (void) utf8_width(&cp, &l);
1026 if (!cp)
1027 break; /* truncated in the middle? */
1028 }
1029 return allot - l;
1030}
1031
d68fe26f 1032static void find_lno(const char *line, struct emit_callback *ecbdata)
690ed843 1033{
d68fe26f
JH
1034 const char *p;
1035 ecbdata->lno_in_preimage = 0;
1036 ecbdata->lno_in_postimage = 0;
1037 p = strchr(line, '-');
690ed843 1038 if (!p)
d68fe26f
JH
1039 return; /* cannot happen */
1040 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1041 p = strchr(p, '+');
1042 if (!p)
1043 return; /* cannot happen */
1044 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
690ed843
JH
1045}
1046
cd112cef 1047static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae 1048{
6973dcae 1049 struct emit_callback *ecbdata = priv;
472ca780
JK
1050 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1051 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 1052 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
7be57610
BY
1053 struct diff_options *o = ecbdata->opt;
1054 char *line_prefix = "";
1055 struct strbuf *msgbuf;
1056
1057 if (o && o->output_prefix) {
1058 msgbuf = o->output_prefix(o, o->output_prefix_data);
1059 line_prefix = msgbuf->buf;
1060 }
6973dcae 1061
3e97c7c6 1062 if (ecbdata->header) {
a3c158d4 1063 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
3e97c7c6
GB
1064 strbuf_reset(ecbdata->header);
1065 ecbdata->header = NULL;
1066 }
34a5e1a2
JS
1067 *(ecbdata->found_changesp) = 1;
1068
6973dcae 1069 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
1070 const char *name_a_tab, *name_b_tab;
1071
1072 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1073 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1074
7be57610
BY
1075 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1077 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1078 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
1079 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1080 }
cd112cef 1081
a624eaa7
JM
1082 if (diff_suppress_blank_empty
1083 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1084 line[0] = '\n';
1085 len = 1;
1086 }
1087
b8d9c1a6 1088 if (line[0] == '@') {
76fd2828
JH
1089 if (ecbdata->diff_words)
1090 diff_words_flush(ecbdata);
23707811 1091 len = sane_truncate_line(ecbdata, line, len);
d68fe26f 1092 find_lno(line, ecbdata);
89cb73a1 1093 emit_hunk_header(ecbdata, line, len);
23707811 1094 if (line[len-1] != '\n')
a3c158d4 1095 putc('\n', ecbdata->opt->file);
448c3ef1 1096 return;
cd112cef 1097 }
448c3ef1 1098
b8d9c1a6 1099 if (len < 1) {
a3c158d4 1100 emit_line(ecbdata->opt, reset, reset, line, len);
882749a0
TR
1101 if (ecbdata->diff_words
1102 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
a3c158d4 1103 fputs("~\n", ecbdata->opt->file);
448c3ef1 1104 return;
cd112cef 1105 }
448c3ef1 1106
448c3ef1
JH
1107 if (ecbdata->diff_words) {
1108 if (line[0] == '-') {
1109 diff_words_append(line, len,
1110 &ecbdata->diff_words->minus);
1111 return;
1112 } else if (line[0] == '+') {
1113 diff_words_append(line, len,
1114 &ecbdata->diff_words->plus);
1115 return;
c7c2bc0a
TR
1116 } else if (!prefixcmp(line, "\\ ")) {
1117 /*
1118 * Eat the "no newline at eof" marker as if we
1119 * saw a "+" or "-" line with nothing on it,
1120 * and return without diff_words_flush() to
1121 * defer processing. If this is the end of
1122 * preimage, more "+" lines may come after it.
1123 */
1124 return;
448c3ef1 1125 }
76fd2828 1126 diff_words_flush(ecbdata);
882749a0 1127 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
a3c158d4
BY
1128 emit_line(ecbdata->opt, plain, reset, line, len);
1129 fputs("~\n", ecbdata->opt->file);
882749a0 1130 } else {
42536dd9
JM
1131 /*
1132 * Skip the prefix character, if any. With
1133 * diff_suppress_blank_empty, there may be
1134 * none.
1135 */
1136 if (line[0] != '\n') {
1137 line++;
1138 len--;
1139 }
1140 emit_line(ecbdata->opt, plain, reset, line, len);
882749a0 1141 }
448c3ef1
JH
1142 return;
1143 }
448c3ef1 1144
690ed843
JH
1145 if (line[0] != '+') {
1146 const char *color =
1147 diff_get_color(ecbdata->color_diff,
1148 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1149 ecbdata->lno_in_preimage++;
d68fe26f
JH
1150 if (line[0] == ' ')
1151 ecbdata->lno_in_postimage++;
a3c158d4 1152 emit_line(ecbdata->opt, color, reset, line, len);
d68fe26f
JH
1153 } else {
1154 ecbdata->lno_in_postimage++;
018cff70 1155 emit_add_line(reset, ecbdata, line + 1, len - 1);
448c3ef1 1156 }
6973dcae
JH
1157}
1158
1159static char *pprint_rename(const char *a, const char *b)
1160{
1161 const char *old = a;
1162 const char *new = b;
f285a2d7 1163 struct strbuf name = STRBUF_INIT;
6973dcae
JH
1164 int pfx_length, sfx_length;
1165 int len_a = strlen(a);
1166 int len_b = strlen(b);
663af342 1167 int a_midlen, b_midlen;
e5bfbf9b
AJ
1168 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1169 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1170
1171 if (qlen_a || qlen_b) {
663af342
PH
1172 quote_c_style(a, &name, NULL, 0);
1173 strbuf_addstr(&name, " => ");
1174 quote_c_style(b, &name, NULL, 0);
b315c5c0 1175 return strbuf_detach(&name, NULL);
e5bfbf9b 1176 }
6973dcae
JH
1177
1178 /* Find common prefix */
1179 pfx_length = 0;
1180 while (*old && *new && *old == *new) {
1181 if (*old == '/')
1182 pfx_length = old - a + 1;
1183 old++;
1184 new++;
1185 }
1186
1187 /* Find common suffix */
1188 old = a + len_a;
1189 new = b + len_b;
1190 sfx_length = 0;
1191 while (a <= old && b <= new && *old == *new) {
1192 if (*old == '/')
1193 sfx_length = len_a - (old - a);
1194 old--;
1195 new--;
1196 }
1197
1198 /*
1199 * pfx{mid-a => mid-b}sfx
1200 * {pfx-a => pfx-b}sfx
1201 * pfx{sfx-a => sfx-b}
1202 * name-a => name-b
1203 */
663af342
PH
1204 a_midlen = len_a - pfx_length - sfx_length;
1205 b_midlen = len_b - pfx_length - sfx_length;
1206 if (a_midlen < 0)
1207 a_midlen = 0;
1208 if (b_midlen < 0)
1209 b_midlen = 0;
1210
1211 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 1212 if (pfx_length + sfx_length) {
663af342
PH
1213 strbuf_add(&name, a, pfx_length);
1214 strbuf_addch(&name, '{');
6973dcae 1215 }
663af342
PH
1216 strbuf_add(&name, a + pfx_length, a_midlen);
1217 strbuf_addstr(&name, " => ");
1218 strbuf_add(&name, b + pfx_length, b_midlen);
1219 if (pfx_length + sfx_length) {
1220 strbuf_addch(&name, '}');
1221 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 1222 }
b315c5c0 1223 return strbuf_detach(&name, NULL);
6973dcae
JH
1224}
1225
1226struct diffstat_t {
6973dcae
JH
1227 int nr;
1228 int alloc;
1229 struct diffstat_file {
f604652e 1230 char *from_name;
6973dcae 1231 char *name;
f604652e 1232 char *print_name;
6973dcae
JH
1233 unsigned is_unmerged:1;
1234 unsigned is_binary:1;
1235 unsigned is_renamed:1;
0974c117 1236 uintmax_t added, deleted;
6973dcae
JH
1237 } **files;
1238};
1239
1240static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1241 const char *name_a,
1242 const char *name_b)
1243{
1244 struct diffstat_file *x;
1245 x = xcalloc(sizeof (*x), 1);
1246 if (diffstat->nr == diffstat->alloc) {
1247 diffstat->alloc = alloc_nr(diffstat->alloc);
1248 diffstat->files = xrealloc(diffstat->files,
1249 diffstat->alloc * sizeof(x));
1250 }
1251 diffstat->files[diffstat->nr++] = x;
1252 if (name_b) {
f604652e
JH
1253 x->from_name = xstrdup(name_a);
1254 x->name = xstrdup(name_b);
6973dcae
JH
1255 x->is_renamed = 1;
1256 }
f604652e
JH
1257 else {
1258 x->from_name = NULL;
9befac47 1259 x->name = xstrdup(name_a);
f604652e 1260 }
6973dcae
JH
1261 return x;
1262}
1263
1264static void diffstat_consume(void *priv, char *line, unsigned long len)
1265{
1266 struct diffstat_t *diffstat = priv;
1267 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1268
1269 if (line[0] == '+')
1270 x->added++;
1271 else if (line[0] == '-')
1272 x->deleted++;
1273}
1274
698ce6f8 1275const char mime_boundary_leader[] = "------------";
6973dcae 1276
a2540023
JH
1277static int scale_linear(int it, int width, int max_change)
1278{
1279 /*
3ed74e60
JS
1280 * make sure that at least one '-' is printed if there were deletions,
1281 * and likewise for '+'.
a2540023 1282 */
3ed74e60
JS
1283 if (max_change < 2)
1284 return it;
1285 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
1286}
1287
c0c77734 1288static void show_name(FILE *file,
a408e0e6 1289 const char *prefix, const char *name, int len)
a2540023 1290{
a408e0e6 1291 fprintf(file, " %s%-*s |", prefix, len, name);
a2540023
JH
1292}
1293
c0c77734 1294static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
1295{
1296 if (cnt <= 0)
1297 return;
c0c77734 1298 fprintf(file, "%s", set);
a2540023 1299 while (cnt--)
c0c77734
DB
1300 putc(ch, file);
1301 fprintf(file, "%s", reset);
a2540023
JH
1302}
1303
f604652e
JH
1304static void fill_print_name(struct diffstat_file *file)
1305{
1306 char *pname;
1307
1308 if (file->print_name)
1309 return;
1310
1311 if (!file->is_renamed) {
f285a2d7 1312 struct strbuf buf = STRBUF_INIT;
f604652e
JH
1313 if (quote_c_style(file->name, &buf, NULL, 0)) {
1314 pname = strbuf_detach(&buf, NULL);
1315 } else {
1316 pname = file->name;
1317 strbuf_release(&buf);
1318 }
1319 } else {
1320 pname = pprint_rename(file->from_name, file->name);
1321 }
1322 file->print_name = pname;
1323}
1324
4b25d091 1325static void show_stats(struct diffstat_t *data, struct diff_options *options)
6973dcae 1326{
eb3a9dd3 1327 int i, len, add, del, adds = 0, dels = 0;
0974c117 1328 uintmax_t max_change = 0, max_len = 0;
6973dcae 1329 int total_files = data->nr;
808e1db2 1330 int width, name_width, count;
c0aa335c 1331 const char *reset, *add_c, *del_c;
7be57610 1332 const char *line_prefix = "";
e5f85df8 1333 int extra_shown = 0;
7be57610 1334 struct strbuf *msg = NULL;
6973dcae
JH
1335
1336 if (data->nr == 0)
1337 return;
1338
7be57610
BY
1339 if (options->output_prefix) {
1340 msg = options->output_prefix(options, options->output_prefix_data);
1341 line_prefix = msg->buf;
1342 }
1343
a2540023
JH
1344 width = options->stat_width ? options->stat_width : 80;
1345 name_width = options->stat_name_width ? options->stat_name_width : 50;
808e1db2 1346 count = options->stat_count ? options->stat_count : data->nr;
a2540023
JH
1347
1348 /* Sanity: give at least 5 columns to the graph,
1349 * but leave at least 10 columns for the name.
1350 */
861d1af3
OM
1351 if (width < 25)
1352 width = 25;
1353 if (name_width < 10)
1354 name_width = 10;
1355 else if (width < name_width + 15)
1356 name_width = width - 15;
a2540023
JH
1357
1358 /* Find the longest filename and max number of changes */
8f67f8ae 1359 reset = diff_get_color_opt(options, DIFF_RESET);
8f67f8ae
PH
1360 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1361 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 1362
808e1db2 1363 for (i = 0; (i < count) && (i < data->nr); i++) {
6973dcae 1364 struct diffstat_file *file = data->files[i];
0974c117 1365 uintmax_t change = file->added + file->deleted;
358e460e
MG
1366 if (!data->files[i]->is_renamed &&
1367 (change == 0)) {
808e1db2 1368 count++; /* not shown == room for one more */
358e460e
MG
1369 continue;
1370 }
f604652e
JH
1371 fill_print_name(file);
1372 len = strlen(file->print_name);
6973dcae
JH
1373 if (max_len < len)
1374 max_len = len;
1375
1376 if (file->is_binary || file->is_unmerged)
1377 continue;
a2540023
JH
1378 if (max_change < change)
1379 max_change = change;
6973dcae 1380 }
808e1db2 1381 count = i; /* min(count, data->nr) */
6973dcae 1382
a2540023
JH
1383 /* Compute the width of the graph part;
1384 * 10 is for one blank at the beginning of the line plus
1385 * " | count " between the name and the graph.
1386 *
1387 * From here on, name_width is the width of the name area,
1388 * and width is the width of the graph area.
1389 */
1390 name_width = (name_width < max_len) ? name_width : max_len;
1391 if (width < (name_width + 10) + max_change)
1392 width = width - (name_width + 10);
1393 else
1394 width = max_change;
1395
808e1db2 1396 for (i = 0; i < count; i++) {
d2543b8e 1397 const char *prefix = "";
f604652e 1398 char *name = data->files[i]->print_name;
0974c117
JK
1399 uintmax_t added = data->files[i]->added;
1400 uintmax_t deleted = data->files[i]->deleted;
a2540023 1401 int name_len;
6973dcae 1402
358e460e
MG
1403 if (!data->files[i]->is_renamed &&
1404 (added + deleted == 0)) {
1405 total_files--;
1406 continue;
1407 }
6973dcae
JH
1408 /*
1409 * "scale" the filename
1410 */
a2540023
JH
1411 len = name_width;
1412 name_len = strlen(name);
1413 if (name_width < name_len) {
6973dcae
JH
1414 char *slash;
1415 prefix = "...";
a2540023
JH
1416 len -= 3;
1417 name += name_len - len;
6973dcae
JH
1418 slash = strchr(name, '/');
1419 if (slash)
1420 name = slash;
1421 }
6973dcae
JH
1422
1423 if (data->files[i]->is_binary) {
7be57610 1424 fprintf(options->file, "%s", line_prefix);
a408e0e6 1425 show_name(options->file, prefix, name, len);
c0c77734 1426 fprintf(options->file, " Bin ");
0974c117
JK
1427 fprintf(options->file, "%s%"PRIuMAX"%s",
1428 del_c, deleted, reset);
c0c77734 1429 fprintf(options->file, " -> ");
0974c117
JK
1430 fprintf(options->file, "%s%"PRIuMAX"%s",
1431 add_c, added, reset);
c0c77734
DB
1432 fprintf(options->file, " bytes");
1433 fprintf(options->file, "\n");
f604652e 1434 continue;
6973dcae
JH
1435 }
1436 else if (data->files[i]->is_unmerged) {
7be57610 1437 fprintf(options->file, "%s", line_prefix);
a408e0e6 1438 show_name(options->file, prefix, name, len);
c0c77734 1439 fprintf(options->file, " Unmerged\n");
f604652e 1440 continue;
6973dcae 1441 }
6973dcae 1442
a2540023
JH
1443 /*
1444 * scale the add/delete
1445 */
6973dcae
JH
1446 add = added;
1447 del = deleted;
6973dcae
JH
1448 adds += add;
1449 dels += del;
1450
a2540023 1451 if (width <= max_change) {
a2540023 1452 add = scale_linear(add, width, max_change);
3ed74e60 1453 del = scale_linear(del, width, max_change);
6973dcae 1454 }
7be57610 1455 fprintf(options->file, "%s", line_prefix);
a408e0e6 1456 show_name(options->file, prefix, name, len);
0974c117 1457 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
4d9b5359 1458 added + deleted ? " " : "");
c0c77734
DB
1459 show_graph(options->file, '+', add, add_c, reset);
1460 show_graph(options->file, '-', del, del_c, reset);
1461 fprintf(options->file, "\n");
1462 }
808e1db2
MG
1463 for (i = count; i < data->nr; i++) {
1464 uintmax_t added = data->files[i]->added;
1465 uintmax_t deleted = data->files[i]->deleted;
1466 if (!data->files[i]->is_renamed &&
1467 (added + deleted == 0)) {
1468 total_files--;
1469 continue;
1470 }
1471 adds += added;
1472 dels += deleted;
e5f85df8
JH
1473 if (!extra_shown)
1474 fprintf(options->file, "%s ...\n", line_prefix);
1475 extra_shown = 1;
808e1db2 1476 }
7be57610 1477 fprintf(options->file, "%s", line_prefix);
c0c77734 1478 fprintf(options->file,
a408e0e6
MH
1479 " %d files changed, %d insertions(+), %d deletions(-)\n",
1480 total_files, adds, dels);
6973dcae
JH
1481}
1482
2775d92c 1483static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
ebd124c6
NP
1484{
1485 int i, adds = 0, dels = 0, total_files = data->nr;
1486
1487 if (data->nr == 0)
1488 return;
1489
1490 for (i = 0; i < data->nr; i++) {
1491 if (!data->files[i]->is_binary &&
1492 !data->files[i]->is_unmerged) {
1493 int added = data->files[i]->added;
1494 int deleted= data->files[i]->deleted;
1495 if (!data->files[i]->is_renamed &&
1496 (added + deleted == 0)) {
1497 total_files--;
1498 } else {
1499 adds += added;
1500 dels += deleted;
1501 }
1502 }
ebd124c6 1503 }
7be57610
BY
1504 if (options->output_prefix) {
1505 struct strbuf *msg = NULL;
1506 msg = options->output_prefix(options,
1507 options->output_prefix_data);
1508 fprintf(options->file, "%s", msg->buf);
1509 }
c0c77734 1510 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
ebd124c6
NP
1511 total_files, adds, dels);
1512}
1513
4b25d091 1514static void show_numstat(struct diffstat_t *data, struct diff_options *options)
74e2abe5
JH
1515{
1516 int i;
1517
f604652e
JH
1518 if (data->nr == 0)
1519 return;
1520
74e2abe5
JH
1521 for (i = 0; i < data->nr; i++) {
1522 struct diffstat_file *file = data->files[i];
1523
7be57610
BY
1524 if (options->output_prefix) {
1525 struct strbuf *msg = NULL;
1526 msg = options->output_prefix(options,
1527 options->output_prefix_data);
1528 fprintf(options->file, "%s", msg->buf);
1529 }
1530
bfddbc5e 1531 if (file->is_binary)
c0c77734 1532 fprintf(options->file, "-\t-\t");
bfddbc5e 1533 else
c0c77734 1534 fprintf(options->file,
0974c117
JK
1535 "%"PRIuMAX"\t%"PRIuMAX"\t",
1536 file->added, file->deleted);
f604652e
JH
1537 if (options->line_termination) {
1538 fill_print_name(file);
1539 if (!file->is_renamed)
c0c77734 1540 write_name_quoted(file->name, options->file,
f604652e
JH
1541 options->line_termination);
1542 else {
c0c77734
DB
1543 fputs(file->print_name, options->file);
1544 putc(options->line_termination, options->file);
f604652e 1545 }
663af342 1546 } else {
f604652e 1547 if (file->is_renamed) {
c0c77734
DB
1548 putc('\0', options->file);
1549 write_name_quoted(file->from_name, options->file, '\0');
f604652e 1550 }
c0c77734 1551 write_name_quoted(file->name, options->file, '\0');
663af342 1552 }
74e2abe5
JH
1553 }
1554}
1555
c04a7155
JH
1556struct dirstat_file {
1557 const char *name;
1558 unsigned long changed;
7df7c019
LT
1559};
1560
c04a7155
JH
1561struct dirstat_dir {
1562 struct dirstat_file *files;
712d2c7d 1563 int alloc, nr, permille, cumulative;
c04a7155
JH
1564};
1565
7be57610
BY
1566static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1567 unsigned long changed, const char *base, int baselen)
7df7c019
LT
1568{
1569 unsigned long this_dir = 0;
1570 unsigned int sources = 0;
7be57610
BY
1571 const char *line_prefix = "";
1572 struct strbuf *msg = NULL;
1573
1574 if (opt->output_prefix) {
1575 msg = opt->output_prefix(opt, opt->output_prefix_data);
1576 line_prefix = msg->buf;
1577 }
7df7c019
LT
1578
1579 while (dir->nr) {
c04a7155 1580 struct dirstat_file *f = dir->files;
7df7c019
LT
1581 int namelen = strlen(f->name);
1582 unsigned long this;
1583 char *slash;
1584
1585 if (namelen < baselen)
1586 break;
1587 if (memcmp(f->name, base, baselen))
1588 break;
1589 slash = strchr(f->name + baselen, '/');
1590 if (slash) {
1591 int newbaselen = slash + 1 - f->name;
7be57610 1592 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
7df7c019
LT
1593 sources++;
1594 } else {
c04a7155 1595 this = f->changed;
7df7c019
LT
1596 dir->files++;
1597 dir->nr--;
1598 sources += 2;
1599 }
1600 this_dir += this;
1601 }
1602
1603 /*
1604 * We don't report dirstat's for
1605 * - the top level
1606 * - or cases where everything came from a single directory
1607 * under this directory (sources == 1).
1608 */
1609 if (baselen && sources != 1) {
58a8756a
JH
1610 if (this_dir) {
1611 int permille = this_dir * 1000 / changed;
712d2c7d 1612 if (permille >= dir->permille) {
7be57610 1613 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
712d2c7d 1614 permille / 10, permille % 10, baselen, base);
7df7c019
LT
1615 if (!dir->cumulative)
1616 return 0;
1617 }
1618 }
1619 }
1620 return this_dir;
1621}
1622
441bca0b
LT
1623static int dirstat_compare(const void *_a, const void *_b)
1624{
1625 const struct dirstat_file *a = _a;
1626 const struct dirstat_file *b = _b;
1627 return strcmp(a->name, b->name);
1628}
1629
c04a7155 1630static void show_dirstat(struct diff_options *options)
7df7c019
LT
1631{
1632 int i;
1633 unsigned long changed;
c04a7155
JH
1634 struct dirstat_dir dir;
1635 struct diff_queue_struct *q = &diff_queued_diff;
1636
1637 dir.files = NULL;
1638 dir.alloc = 0;
1639 dir.nr = 0;
712d2c7d 1640 dir.permille = options->dirstat_permille;
f88d225f 1641 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
7df7c019 1642
7df7c019 1643 changed = 0;
c04a7155
JH
1644 for (i = 0; i < q->nr; i++) {
1645 struct diff_filepair *p = q->queue[i];
1646 const char *name;
1647 unsigned long copied, added, damage;
0133dab7 1648 int content_changed;
c04a7155 1649
2ca86714 1650 name = p->two->path ? p->two->path : p->one->path;
c04a7155 1651
0133dab7
JH
1652 if (p->one->sha1_valid && p->two->sha1_valid)
1653 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1654 else
1655 content_changed = 1;
1656
2ff3a803
JH
1657 if (!content_changed) {
1658 /*
1659 * The SHA1 has not changed, so pre-/post-content is
1660 * identical. We can therefore skip looking at the
1661 * file contents altogether.
1662 */
1663 damage = 0;
1664 goto found_damage;
1665 }
1666
0133dab7
JH
1667 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1668 /*
1669 * In --dirstat-by-file mode, we don't really need to
1670 * look at the actual file contents at all.
1671 * The fact that the SHA1 changed is enough for us to
1672 * add this file to the list of results
1673 * (with each file contributing equal damage).
1674 */
2ff3a803 1675 damage = 1;
0133dab7
JH
1676 goto found_damage;
1677 }
c04a7155
JH
1678
1679 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1680 diff_populate_filespec(p->one, 0);
1681 diff_populate_filespec(p->two, 0);
1682 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1683 &copied, &added);
1684 diff_free_filespec_data(p->one);
1685 diff_free_filespec_data(p->two);
1686 } else if (DIFF_FILE_VALID(p->one)) {
1687 diff_populate_filespec(p->one, 1);
1688 copied = added = 0;
1689 diff_free_filespec_data(p->one);
1690 } else if (DIFF_FILE_VALID(p->two)) {
1691 diff_populate_filespec(p->two, 1);
1692 copied = 0;
1693 added = p->two->size;
1694 diff_free_filespec_data(p->two);
1695 } else
2b0b551d 1696 continue;
c04a7155
JH
1697
1698 /*
1699 * Original minus copied is the removed material,
1700 * added is the new material. They are both damages
0133dab7 1701 * made to the preimage.
2ff3a803
JH
1702 * If the resulting damage is zero, we know that
1703 * diffcore_count_changes() considers the two entries to
1704 * be identical, but since content_changed is true, we
1705 * know that there must have been _some_ kind of change,
1706 * so we force all entries to have damage > 0.
c04a7155
JH
1707 */
1708 damage = (p->one->size - copied) + added;
2ff3a803 1709 if (!damage)
fd33777b 1710 damage = 1;
c04a7155 1711
0133dab7 1712found_damage:
c04a7155
JH
1713 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1714 dir.files[dir.nr].name = name;
1715 dir.files[dir.nr].changed = damage;
1716 changed += damage;
1717 dir.nr++;
7df7c019
LT
1718 }
1719
1720 /* This can happen even with many files, if everything was renames */
1721 if (!changed)
1722 return;
1723
1724 /* Show all directories with more than x% of the changes */
441bca0b 1725 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
7be57610 1726 gather_dirstat(options, &dir, changed, "", 0);
7df7c019
LT
1727}
1728
1c57a627
JH
1729static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1730{
1731 int i;
1732 unsigned long changed;
1733 struct dirstat_dir dir;
1734
1735 if (data->nr == 0)
1736 return;
1737
1738 dir.files = NULL;
1739 dir.alloc = 0;
1740 dir.nr = 0;
1741 dir.permille = options->dirstat_permille;
1742 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1743
1744 changed = 0;
1745 for (i = 0; i < data->nr; i++) {
1746 struct diffstat_file *file = data->files[i];
1747 unsigned long damage = file->added + file->deleted;
1748 if (file->is_binary)
1749 /*
1750 * binary files counts bytes, not lines. Must find some
1751 * way to normalize binary bytes vs. textual lines.
1752 * The following heuristic assumes that there are 64
1753 * bytes per "line".
1754 * This is stupid and ugly, but very cheap...
1755 */
1756 damage = (damage + 63) / 64;
1757 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1758 dir.files[dir.nr].name = file->name;
1759 dir.files[dir.nr].changed = damage;
1760 changed += damage;
1761 dir.nr++;
1762 }
1763
1764 /* This can happen even with many files, if everything was renames */
1765 if (!changed)
1766 return;
1767
1768 /* Show all directories with more than x% of the changes */
1769 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1770 gather_dirstat(options, &dir, changed, "", 0);
1771}
1772
f604652e
JH
1773static void free_diffstat_info(struct diffstat_t *diffstat)
1774{
1775 int i;
1776 for (i = 0; i < diffstat->nr; i++) {
1777 struct diffstat_file *f = diffstat->files[i];
1778 if (f->name != f->print_name)
1779 free(f->print_name);
1780 free(f->name);
1781 free(f->from_name);
1782 free(f);
1783 }
1784 free(diffstat->files);
1785}
1786
88246898 1787struct checkdiff_t {
88246898 1788 const char *filename;
1ba111d1 1789 int lineno;
a757c646 1790 int conflict_marker_size;
1ba111d1 1791 struct diff_options *o;
cf1b7869 1792 unsigned ws_rule;
62c64895 1793 unsigned status;
88246898
JS
1794};
1795
a757c646 1796static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
04954043
JH
1797{
1798 char firstchar;
1799 int cnt;
1800
a757c646 1801 if (len < marker_size + 1)
04954043
JH
1802 return 0;
1803 firstchar = line[0];
1804 switch (firstchar) {
a757c646 1805 case '=': case '>': case '<': case '|':
04954043
JH
1806 break;
1807 default:
1808 return 0;
1809 }
a757c646 1810 for (cnt = 1; cnt < marker_size; cnt++)
04954043
JH
1811 if (line[cnt] != firstchar)
1812 return 0;
a757c646
JH
1813 /* line[1] thru line[marker_size-1] are same as firstchar */
1814 if (len < marker_size + 1 || !isspace(line[marker_size]))
04954043 1815 return 0;
04954043
JH
1816 return 1;
1817}
1818
88246898
JS
1819static void checkdiff_consume(void *priv, char *line, unsigned long len)
1820{
1821 struct checkdiff_t *data = priv;
a757c646 1822 int marker_size = data->conflict_marker_size;
f1c96261
JK
1823 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1824 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1825 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
c1795bb0 1826 char *err;
7be57610
BY
1827 char *line_prefix = "";
1828 struct strbuf *msgbuf;
1829
1830 assert(data->o);
1831 if (data->o->output_prefix) {
1832 msgbuf = data->o->output_prefix(data->o,
1833 data->o->output_prefix_data);
1834 line_prefix = msgbuf->buf;
1835 }
88246898
JS
1836
1837 if (line[0] == '+') {
18374e58 1838 unsigned bad;
0ef617f4 1839 data->lineno++;
a757c646 1840 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
04954043
JH
1841 data->status |= 1;
1842 fprintf(data->o->file,
7be57610
BY
1843 "%s%s:%d: leftover conflict marker\n",
1844 line_prefix, data->filename, data->lineno);
04954043 1845 }
8f8841e9 1846 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 1847 if (!bad)
c1795bb0 1848 return;
18374e58
JH
1849 data->status |= bad;
1850 err = whitespace_error_string(bad);
7be57610
BY
1851 fprintf(data->o->file, "%s%s:%d: %s.\n",
1852 line_prefix, data->filename, data->lineno, err);
c1795bb0 1853 free(err);
a3c158d4 1854 emit_line(data->o, set, reset, line, 1);
8f8841e9 1855 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 1856 data->o->file, set, reset, ws);
877f23cc 1857 } else if (line[0] == ' ') {
88246898 1858 data->lineno++;
877f23cc 1859 } else if (line[0] == '@') {
88246898
JS
1860 char *plus = strchr(line, '+');
1861 if (plus)
0ef617f4 1862 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
1863 else
1864 die("invalid diff");
1865 }
1866}
1867
0660626c
JH
1868static unsigned char *deflate_it(char *data,
1869 unsigned long size,
1870 unsigned long *result_size)
051308f6 1871{
0660626c
JH
1872 int bound;
1873 unsigned char *deflated;
ef49a7a0 1874 git_zstream stream;
0660626c
JH
1875
1876 memset(&stream, 0, sizeof(stream));
55bb5c91 1877 git_deflate_init(&stream, zlib_compression_level);
225a6f10 1878 bound = git_deflate_bound(&stream, size);
0660626c
JH
1879 deflated = xmalloc(bound);
1880 stream.next_out = deflated;
1881 stream.avail_out = bound;
1882
1883 stream.next_in = (unsigned char *)data;
1884 stream.avail_in = size;
55bb5c91 1885 while (git_deflate(&stream, Z_FINISH) == Z_OK)
0660626c 1886 ; /* nothing */
55bb5c91 1887 git_deflate_end(&stream);
0660626c
JH
1888 *result_size = stream.total_out;
1889 return deflated;
051308f6
JH
1890}
1891
7be57610 1892static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
051308f6 1893{
0660626c
JH
1894 void *cp;
1895 void *delta;
1896 void *deflated;
1897 void *data;
1898 unsigned long orig_size;
1899 unsigned long delta_size;
1900 unsigned long deflate_size;
1901 unsigned long data_size;
051308f6 1902
0660626c
JH
1903 /* We could do deflated delta, or we could do just deflated two,
1904 * whichever is smaller.
051308f6 1905 */
0660626c
JH
1906 delta = NULL;
1907 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1908 if (one->size && two->size) {
1909 delta = diff_delta(one->ptr, one->size,
1910 two->ptr, two->size,
1911 &delta_size, deflate_size);
1912 if (delta) {
1913 void *to_free = delta;
1914 orig_size = delta_size;
1915 delta = deflate_it(delta, delta_size, &delta_size);
1916 free(to_free);
051308f6
JH
1917 }
1918 }
051308f6 1919
0660626c 1920 if (delta && delta_size < deflate_size) {
7be57610 1921 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
0660626c
JH
1922 free(deflated);
1923 data = delta;
1924 data_size = delta_size;
1925 }
1926 else {
7be57610 1927 fprintf(file, "%sliteral %lu\n", prefix, two->size);
0660626c
JH
1928 free(delta);
1929 data = deflated;
1930 data_size = deflate_size;
1931 }
051308f6 1932
0660626c
JH
1933 /* emit data encoded in base85 */
1934 cp = data;
1935 while (data_size) {
1936 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1937 char line[70];
0660626c 1938 data_size -= bytes;
051308f6
JH
1939 if (bytes <= 26)
1940 line[0] = bytes + 'A' - 1;
1941 else
1942 line[0] = bytes - 26 + 'a' - 1;
1943 encode_85(line + 1, cp, bytes);
1d7f171c 1944 cp = (char *) cp + bytes;
7be57610 1945 fprintf(file, "%s", prefix);
c0c77734
DB
1946 fputs(line, file);
1947 fputc('\n', file);
051308f6 1948 }
7be57610 1949 fprintf(file, "%s\n", prefix);
0660626c 1950 free(data);
051308f6
JH
1951}
1952
7be57610 1953static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
d4c452f0 1954{
7be57610
BY
1955 fprintf(file, "%sGIT binary patch\n", prefix);
1956 emit_binary_diff_body(file, one, two, prefix);
1957 emit_binary_diff_body(file, two, one, prefix);
d4c452f0
JH
1958}
1959
72cf4841 1960static void diff_filespec_load_driver(struct diff_filespec *one)
6973dcae 1961{
d391c0ff
JK
1962 /* Use already-loaded driver */
1963 if (one->driver)
1964 return;
1965
1966 if (S_ISREG(one->mode))
122aa6f9 1967 one->driver = userdiff_find_by_path(one->path);
d391c0ff
JK
1968
1969 /* Fallback to default settings */
122aa6f9
JK
1970 if (!one->driver)
1971 one->driver = userdiff_find_by_name("default");
29a3eefd
JH
1972}
1973
1974int diff_filespec_is_binary(struct diff_filespec *one)
1975{
122aa6f9
JK
1976 if (one->is_binary == -1) {
1977 diff_filespec_load_driver(one);
1978 if (one->driver->binary != -1)
1979 one->is_binary = one->driver->binary;
1980 else {
1981 if (!one->data && DIFF_FILE_VALID(one))
1982 diff_populate_filespec(one, 0);
1983 if (one->data)
1984 one->is_binary = buffer_is_binary(one->data,
1985 one->size);
1986 if (one->is_binary == -1)
1987 one->is_binary = 0;
1988 }
1989 }
29a3eefd 1990 return one->is_binary;
6973dcae
JH
1991}
1992
be58e70d 1993static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1994{
122aa6f9
JK
1995 diff_filespec_load_driver(one);
1996 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
f258475a
JH
1997}
1998
80c49c3d
TR
1999static const char *userdiff_word_regex(struct diff_filespec *one)
2000{
2001 diff_filespec_load_driver(one);
2002 return one->driver->word_regex;
2003}
2004
a5a818ee
JH
2005void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2006{
2007 if (!options->a_prefix)
2008 options->a_prefix = a;
2009 if (!options->b_prefix)
2010 options->b_prefix = b;
2011}
2012
a788d7d5 2013struct userdiff_driver *get_textconv(struct diff_filespec *one)
04427ac8
JK
2014{
2015 if (!DIFF_FILE_VALID(one))
2016 return NULL;
d391c0ff 2017
04427ac8 2018 diff_filespec_load_driver(one);
3813e690 2019 return userdiff_get_textconv(one->driver);
04427ac8
JK
2020}
2021
6973dcae
JH
2022static void builtin_diff(const char *name_a,
2023 const char *name_b,
2024 struct diff_filespec *one,
2025 struct diff_filespec *two,
2026 const char *xfrm_msg,
296c6bb2 2027 int must_show_header,
051308f6 2028 struct diff_options *o,
6973dcae
JH
2029 int complete_rewrite)
2030{
2031 mmfile_t mf1, mf2;
2032 const char *lbl[2];
2033 char *a_one, *b_two;
8f67f8ae
PH
2034 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2035 const char *reset = diff_get_color_opt(o, DIFF_RESET);
a5a818ee 2036 const char *a_prefix, *b_prefix;
d9bae1a1
JK
2037 struct userdiff_driver *textconv_one = NULL;
2038 struct userdiff_driver *textconv_two = NULL;
3e97c7c6 2039 struct strbuf header = STRBUF_INIT;
7be57610
BY
2040 struct strbuf *msgbuf;
2041 char *line_prefix = "";
2042
2043 if (o->output_prefix) {
2044 msgbuf = o->output_prefix(o, o->output_prefix_data);
2045 line_prefix = msgbuf->buf;
2046 }
a5a818ee 2047
752c0c24
JS
2048 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2049 (!one->mode || S_ISGITLINK(one->mode)) &&
2050 (!two->mode || S_ISGITLINK(two->mode))) {
2051 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2052 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2053 show_submodule_summary(o->file, one ? one->path : two->path,
721ceec1 2054 one->sha1, two->sha1, two->dirty_submodule,
752c0c24
JS
2055 del, add, reset);
2056 return;
2057 }
2058
3aa1f7ca
JK
2059 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2060 textconv_one = get_textconv(one);
2061 textconv_two = get_textconv(two);
2062 }
2063
a5a818ee
JH
2064 diff_set_mnemonic_prefix(o, "a/", "b/");
2065 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2066 a_prefix = o->b_prefix;
2067 b_prefix = o->a_prefix;
2068 } else {
2069 a_prefix = o->a_prefix;
2070 b_prefix = o->b_prefix;
2071 }
6973dcae 2072
71b989e7
LT
2073 /* Never use a non-valid filename anywhere if at all possible */
2074 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2075 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2076
a5a818ee
JH
2077 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2078 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
2079 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2080 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
7be57610 2081 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
6973dcae
JH
2082 if (lbl[0][0] == '/') {
2083 /* /dev/null */
7be57610 2084 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
37466447
BW
2085 if (xfrm_msg)
2086 strbuf_addstr(&header, xfrm_msg);
296c6bb2 2087 must_show_header = 1;
6973dcae
JH
2088 }
2089 else if (lbl[1][0] == '/') {
7be57610 2090 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
37466447
BW
2091 if (xfrm_msg)
2092 strbuf_addstr(&header, xfrm_msg);
296c6bb2 2093 must_show_header = 1;
6973dcae
JH
2094 }
2095 else {
2096 if (one->mode != two->mode) {
7be57610
BY
2097 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2098 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
296c6bb2 2099 must_show_header = 1;
cd112cef 2100 }
37466447
BW
2101 if (xfrm_msg)
2102 strbuf_addstr(&header, xfrm_msg);
3e97c7c6 2103
6973dcae
JH
2104 /*
2105 * we do not run diff between different kind
2106 * of objects.
2107 */
2108 if ((one->mode ^ two->mode) & S_IFMT)
2109 goto free_ab_and_return;
0c01857d 2110 if (complete_rewrite &&
3aa1f7ca
JK
2111 (textconv_one || !diff_filespec_is_binary(one)) &&
2112 (textconv_two || !diff_filespec_is_binary(two))) {
3e97c7c6
GB
2113 fprintf(o->file, "%s", header.buf);
2114 strbuf_reset(&header);
3aa1f7ca
JK
2115 emit_rewrite_diff(name_a, name_b, one, two,
2116 textconv_one, textconv_two, o);
34a5e1a2 2117 o->found_changes = 1;
6973dcae
JH
2118 goto free_ab_and_return;
2119 }
2120 }
2121
467ddc14
JH
2122 if (o->irreversible_delete && lbl[1][0] == '/') {
2123 fprintf(o->file, "%s", header.buf);
2124 strbuf_reset(&header);
2125 goto free_ab_and_return;
2126 } else if (!DIFF_OPT_TST(o, TEXT) &&
b3373982
JK
2127 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2128 (!textconv_two && diff_filespec_is_binary(two)) )) {
2129 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2130 die("unable to read files to diff");
0660626c
JH
2131 /* Quite common confusing case */
2132 if (mf1.size == mf2.size &&
296c6bb2
CC
2133 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2134 if (must_show_header)
2135 fprintf(o->file, "%s", header.buf);
0660626c 2136 goto free_ab_and_return;
296c6bb2 2137 }
3e97c7c6
GB
2138 fprintf(o->file, "%s", header.buf);
2139 strbuf_reset(&header);
8f67f8ae 2140 if (DIFF_OPT_TST(o, BINARY))
7be57610 2141 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
051308f6 2142 else
7be57610
BY
2143 fprintf(o->file, "%sBinary files %s and %s differ\n",
2144 line_prefix, lbl[0], lbl[1]);
34a5e1a2 2145 o->found_changes = 1;
467ddc14 2146 } else {
6973dcae
JH
2147 /* Crazy xdl interfaces.. */
2148 const char *diffopts = getenv("GIT_DIFF_OPTS");
2149 xpparam_t xpp;
2150 xdemitconf_t xecfg;
6973dcae 2151 struct emit_callback ecbdata;
be58e70d 2152 const struct userdiff_funcname *pe;
f258475a 2153
296c6bb2 2154 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
3e97c7c6
GB
2155 fprintf(o->file, "%s", header.buf);
2156 strbuf_reset(&header);
2157 }
2158
840383b2
JK
2159 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2160 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
04427ac8 2161
45e7ca0f
BC
2162 pe = diff_funcname_pattern(one);
2163 if (!pe)
2164 pe = diff_funcname_pattern(two);
6973dcae 2165
9ccd0a88 2166 memset(&xpp, 0, sizeof(xpp));
30b25010 2167 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 2168 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 2169 ecbdata.label_path = lbl;
daa0c3d9 2170 ecbdata.color_diff = want_color(o->use_color);
34a5e1a2 2171 ecbdata.found_changesp = &o->found_changes;
cf1b7869 2172 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
690ed843 2173 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
d68fe26f 2174 check_blank_at_eof(&mf1, &mf2, &ecbdata);
a3c158d4 2175 ecbdata.opt = o;
3e97c7c6 2176 ecbdata.header = header.len ? &header : NULL;
582aa00b 2177 xpp.flags = o->xdl_opts;
ee1e5412 2178 xecfg.ctxlen = o->context;
6d0e674a 2179 xecfg.interhunkctxlen = o->interhunkcontext;
6973dcae 2180 xecfg.flags = XDL_EMIT_FUNCNAMES;
14937c2c
RS
2181 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2182 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
45e7ca0f 2183 if (pe)
a013585b 2184 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
6973dcae
JH
2185 if (!diffopts)
2186 ;
cc44c765 2187 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 2188 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 2189 else if (!prefixcmp(diffopts, "-u"))
6973dcae 2190 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
882749a0
TR
2191 if (o->word_diff) {
2192 int i;
2193
f59a59e2
JS
2194 ecbdata.diff_words =
2195 xcalloc(1, sizeof(struct diff_words_data));
882749a0 2196 ecbdata.diff_words->type = o->word_diff;
4297c0ae 2197 ecbdata.diff_words->opt = o;
80c49c3d
TR
2198 if (!o->word_regex)
2199 o->word_regex = userdiff_word_regex(one);
2200 if (!o->word_regex)
2201 o->word_regex = userdiff_word_regex(two);
98a4d87b
BSSJ
2202 if (!o->word_regex)
2203 o->word_regex = diff_word_regex_cfg;
2b6a5417
JS
2204 if (o->word_regex) {
2205 ecbdata.diff_words->word_regex = (regex_t *)
2206 xmalloc(sizeof(regex_t));
2207 if (regcomp(ecbdata.diff_words->word_regex,
bf82940d
TR
2208 o->word_regex,
2209 REG_EXTENDED | REG_NEWLINE))
2b6a5417
JS
2210 die ("Invalid regular expression: %s",
2211 o->word_regex);
2212 }
882749a0
TR
2213 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2214 if (o->word_diff == diff_words_styles[i].type) {
2215 ecbdata.diff_words->style =
2216 &diff_words_styles[i];
2217 break;
2218 }
2219 }
daa0c3d9 2220 if (want_color(o->use_color)) {
882749a0
TR
2221 struct diff_words_style *st = ecbdata.diff_words->style;
2222 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2223 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2224 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2225 }
c0c77734 2226 }
8a3f524b 2227 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
dfea7900 2228 &xpp, &xecfg);
882749a0 2229 if (o->word_diff)
f59a59e2 2230 free_diff_words_data(&ecbdata);
04427ac8
JK
2231 if (textconv_one)
2232 free(mf1.ptr);
2233 if (textconv_two)
2234 free(mf2.ptr);
8cfe5f1c 2235 xdiff_clear_find_func(&xecfg);
6973dcae
JH
2236 }
2237
2238 free_ab_and_return:
3e97c7c6 2239 strbuf_release(&header);
fc3abdf5
JH
2240 diff_free_filespec_data(one);
2241 diff_free_filespec_data(two);
6973dcae
JH
2242 free(a_one);
2243 free(b_two);
2244 return;
2245}
2246
2247static void builtin_diffstat(const char *name_a, const char *name_b,
2248 struct diff_filespec *one,
2249 struct diff_filespec *two,
710158e3 2250 struct diffstat_t *diffstat,
0d21efa5 2251 struct diff_options *o,
710158e3 2252 int complete_rewrite)
6973dcae
JH
2253{
2254 mmfile_t mf1, mf2;
2255 struct diffstat_file *data;
2256
2257 data = diffstat_add(diffstat, name_a, name_b);
2258
2259 if (!one || !two) {
2260 data->is_unmerged = 1;
2261 return;
2262 }
ded0abc7
JK
2263
2264 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
ded0abc7 2265 data->is_binary = 1;
abb371a1
JK
2266 data->added = diff_filespec_size(two);
2267 data->deleted = diff_filespec_size(one);
ded0abc7
JK
2268 }
2269
2270 else if (complete_rewrite) {
710158e3
JH
2271 diff_populate_filespec(one, 0);
2272 diff_populate_filespec(two, 0);
2273 data->deleted = count_lines(one->data, one->size);
2274 data->added = count_lines(two->data, two->size);
710158e3 2275 }
6973dcae 2276
ded0abc7 2277 else {
6973dcae
JH
2278 /* Crazy xdl interfaces.. */
2279 xpparam_t xpp;
2280 xdemitconf_t xecfg;
6973dcae 2281
ded0abc7
JK
2282 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2283 die("unable to read files to diff");
2284
9ccd0a88 2285 memset(&xpp, 0, sizeof(xpp));
30b25010 2286 memset(&xecfg, 0, sizeof(xecfg));
582aa00b 2287 xpp.flags = o->xdl_opts;
f01cae91
JH
2288 xecfg.ctxlen = o->context;
2289 xecfg.interhunkctxlen = o->interhunkcontext;
8a3f524b 2290 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
dfea7900 2291 &xpp, &xecfg);
6973dcae 2292 }
fc3abdf5 2293
fc3abdf5
JH
2294 diff_free_filespec_data(one);
2295 diff_free_filespec_data(two);
6973dcae
JH
2296}
2297
88246898 2298static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 2299 const char *attr_path,
5ff10dd6
JH
2300 struct diff_filespec *one,
2301 struct diff_filespec *two,
2302 struct diff_options *o)
88246898
JS
2303{
2304 mmfile_t mf1, mf2;
2305 struct checkdiff_t data;
2306
2307 if (!two)
2308 return;
2309
2310 memset(&data, 0, sizeof(data));
88246898
JS
2311 data.filename = name_b ? name_b : name_a;
2312 data.lineno = 0;
1ba111d1 2313 data.o = o;
cd676a51 2314 data.ws_rule = whitespace_rule(attr_path);
a757c646 2315 data.conflict_marker_size = ll_merge_marker_size(attr_path);
88246898
JS
2316
2317 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2318 die("unable to read files to diff");
2319
5ff10dd6
JH
2320 /*
2321 * All the other codepaths check both sides, but not checking
2322 * the "old" side here is deliberate. We are checking the newly
2323 * introduced changes, and as long as the "new" side is text, we
2324 * can and should check what it introduces.
2325 */
29a3eefd 2326 if (diff_filespec_is_binary(two))
fc3abdf5 2327 goto free_and_return;
88246898
JS
2328 else {
2329 /* Crazy xdl interfaces.. */
2330 xpparam_t xpp;
2331 xdemitconf_t xecfg;
88246898 2332
9ccd0a88 2333 memset(&xpp, 0, sizeof(xpp));
30b25010 2334 memset(&xecfg, 0, sizeof(xecfg));
c35539eb 2335 xecfg.ctxlen = 1; /* at least one context line */
582aa00b 2336 xpp.flags = 0;
8a3f524b 2337 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
dfea7900 2338 &xpp, &xecfg);
877f23cc 2339
467babf8 2340 if (data.ws_rule & WS_BLANK_AT_EOF) {
d68fe26f
JH
2341 struct emit_callback ecbdata;
2342 int blank_at_eof;
2343
2344 ecbdata.ws_rule = data.ws_rule;
2345 check_blank_at_eof(&mf1, &mf2, &ecbdata);
8837d335 2346 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
d68fe26f 2347
467babf8
JH
2348 if (blank_at_eof) {
2349 static char *err;
2350 if (!err)
2351 err = whitespace_error_string(WS_BLANK_AT_EOF);
2352 fprintf(o->file, "%s:%d: %s.\n",
2353 data.filename, blank_at_eof, err);
2354 data.status = 1; /* report errors */
2355 }
877f23cc 2356 }
88246898 2357 }
fc3abdf5
JH
2358 free_and_return:
2359 diff_free_filespec_data(one);
2360 diff_free_filespec_data(two);
62c64895
WC
2361 if (data.status)
2362 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
2363}
2364
6973dcae
JH
2365struct diff_filespec *alloc_filespec(const char *path)
2366{
2367 int namelen = strlen(path);
2368 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2369
2370 memset(spec, 0, sizeof(*spec));
2371 spec->path = (char *)(spec + 1);
2372 memcpy(spec->path, path, namelen+1);
9fb88419 2373 spec->count = 1;
122aa6f9 2374 spec->is_binary = -1;
6973dcae
JH
2375 return spec;
2376}
2377
9fb88419
LT
2378void free_filespec(struct diff_filespec *spec)
2379{
2380 if (!--spec->count) {
2381 diff_free_filespec_data(spec);
2382 free(spec);
2383 }
2384}
2385
6973dcae
JH
2386void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2387 unsigned short mode)
2388{
2389 if (mode) {
2390 spec->mode = canon_mode(mode);
e702496e 2391 hashcpy(spec->sha1, sha1);
0bef57ee 2392 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
2393 }
2394}
2395
2396/*
5adf317b 2397 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
2398 * the work tree has that object contents, return true, so that
2399 * prepare_temp_file() does not have to inflate and extract.
2400 */
1510fea7 2401static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
2402{
2403 struct cache_entry *ce;
2404 struct stat st;
2405 int pos, len;
2406
150115ad
JH
2407 /*
2408 * We do not read the cache ourselves here, because the
6973dcae
JH
2409 * benchmark with my previous version that always reads cache
2410 * shows that it makes things worse for diff-tree comparing
2411 * two linux-2.6 kernel trees in an already checked out work
2412 * tree. This is because most diff-tree comparisons deal with
2413 * only a small number of files, while reading the cache is
2414 * expensive for a large project, and its cost outweighs the
2415 * savings we get by not inflating the object to a temporary
2416 * file. Practically, this code only helps when we are used
2417 * by diff-cache --cached, which does read the cache before
2418 * calling us.
2419 */
2420 if (!active_cache)
2421 return 0;
2422
1510fea7
SP
2423 /* We want to avoid the working directory if our caller
2424 * doesn't need the data in a normal file, this system
2425 * is rather slow with its stat/open/mmap/close syscalls,
2426 * and the object is contained in a pack file. The pack
2427 * is probably already open and will be faster to obtain
2428 * the data through than the working directory. Loose
2429 * objects however would tend to be slower as they need
2430 * to be individually opened and inflated.
2431 */
cd673c1f 2432 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
1510fea7
SP
2433 return 0;
2434
6973dcae
JH
2435 len = strlen(name);
2436 pos = cache_name_pos(name, len);
2437 if (pos < 0)
2438 return 0;
2439 ce = active_cache[pos];
eadb5831
JH
2440
2441 /*
2442 * This is not the sha1 we are looking for, or
2443 * unreusable because it is not a regular file.
2444 */
2445 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 2446 return 0;
eadb5831 2447
150115ad
JH
2448 /*
2449 * If ce is marked as "assume unchanged", there is no
2450 * guarantee that work tree matches what we are looking for.
2451 */
b4d1690d 2452 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
150115ad
JH
2453 return 0;
2454
eadb5831
JH
2455 /*
2456 * If ce matches the file in the work tree, we can reuse it.
6973dcae 2457 */
eadb5831
JH
2458 if (ce_uptodate(ce) ||
2459 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2460 return 1;
2461
2462 return 0;
6973dcae
JH
2463}
2464
3afaa72d
JH
2465static int populate_from_stdin(struct diff_filespec *s)
2466{
f285a2d7 2467 struct strbuf buf = STRBUF_INIT;
c32f749f 2468 size_t size = 0;
af6eb822 2469
f1696ee3 2470 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 2471 return error("error while reading from stdin %s",
3afaa72d 2472 strerror(errno));
af6eb822 2473
3afaa72d 2474 s->should_munmap = 0;
c32f749f
RS
2475 s->data = strbuf_detach(&buf, &size);
2476 s->size = size;
3afaa72d
JH
2477 s->should_free = 1;
2478 return 0;
2479}
2480
04786756
LT
2481static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2482{
2483 int len;
8e08b419
JH
2484 char *data = xmalloc(100), *dirty = "";
2485
2486 /* Are we looking at the work tree? */
85adbf2f 2487 if (s->dirty_submodule)
8e08b419
JH
2488 dirty = "-dirty";
2489
04786756 2490 len = snprintf(data, 100,
8e08b419 2491 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
04786756
LT
2492 s->data = data;
2493 s->size = len;
2494 s->should_free = 1;
2495 if (size_only) {
2496 s->data = NULL;
2497 free(data);
2498 }
2499 return 0;
2500}
2501
6973dcae
JH
2502/*
2503 * While doing rename detection and pickaxe operation, we may need to
2504 * grab the data for the blob (or file) for our own in-core comparison.
2505 * diff_filespec has data and size fields for this purpose.
2506 */
2507int diff_populate_filespec(struct diff_filespec *s, int size_only)
2508{
2509 int err = 0;
2510 if (!DIFF_FILE_VALID(s))
2511 die("internal error: asking to populate invalid file.");
2512 if (S_ISDIR(s->mode))
2513 return -1;
2514
6973dcae 2515 if (s->data)
fc3abdf5 2516 return 0;
04786756 2517
6e0b8ed6
JH
2518 if (size_only && 0 < s->size)
2519 return 0;
2520
302b9282 2521 if (S_ISGITLINK(s->mode))
04786756
LT
2522 return diff_populate_gitlink(s, size_only);
2523
6973dcae 2524 if (!s->sha1_valid ||
1510fea7 2525 reuse_worktree_file(s->path, s->sha1, 0)) {
f285a2d7 2526 struct strbuf buf = STRBUF_INIT;
6973dcae
JH
2527 struct stat st;
2528 int fd;
6c510bee 2529
3afaa72d
JH
2530 if (!strcmp(s->path, "-"))
2531 return populate_from_stdin(s);
2532
6973dcae
JH
2533 if (lstat(s->path, &st) < 0) {
2534 if (errno == ENOENT) {
2535 err_empty:
2536 err = -1;
2537 empty:
d2543b8e 2538 s->data = (char *)"";
6973dcae
JH
2539 s->size = 0;
2540 return err;
2541 }
2542 }
dc49cd76 2543 s->size = xsize_t(st.st_size);
6973dcae
JH
2544 if (!s->size)
2545 goto empty;
6973dcae 2546 if (S_ISLNK(st.st_mode)) {
cf219d8c
LT
2547 struct strbuf sb = STRBUF_INIT;
2548
2549 if (strbuf_readlink(&sb, s->path, s->size))
6973dcae 2550 goto err_empty;
0956a6db
RS
2551 s->size = sb.len;
2552 s->data = strbuf_detach(&sb, NULL);
cf219d8c 2553 s->should_free = 1;
6973dcae
JH
2554 return 0;
2555 }
cf219d8c
LT
2556 if (size_only)
2557 return 0;
6973dcae
JH
2558 fd = open(s->path, O_RDONLY);
2559 if (fd < 0)
2560 goto err_empty;
c4712e45 2561 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 2562 close(fd);
6973dcae 2563 s->should_munmap = 1;
6c510bee
LT
2564
2565 /*
2566 * Convert from working tree format to canonical git format
2567 */
21e5ad50 2568 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 2569 size_t size = 0;
6c510bee
LT
2570 munmap(s->data, s->size);
2571 s->should_munmap = 0;
c32f749f
RS
2572 s->data = strbuf_detach(&buf, &size);
2573 s->size = size;
6c510bee
LT
2574 s->should_free = 1;
2575 }
6973dcae
JH
2576 }
2577 else {
21666f1a 2578 enum object_type type;
c50c4316 2579 if (size_only) {
21666f1a 2580 type = sha1_object_info(s->sha1, &s->size);
c50c4316
NP
2581 if (type < 0)
2582 die("unable to read %s", sha1_to_hex(s->sha1));
2583 } else {
21666f1a 2584 s->data = read_sha1_file(s->sha1, &type, &s->size);
c50c4316
NP
2585 if (!s->data)
2586 die("unable to read %s", sha1_to_hex(s->sha1));
6973dcae
JH
2587 s->should_free = 1;
2588 }
2589 }
2590 return 0;
2591}
2592
8ae92e63 2593void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
2594{
2595 if (s->should_free)
2596 free(s->data);
2597 else if (s->should_munmap)
2598 munmap(s->data, s->size);
fc3abdf5
JH
2599
2600 if (s->should_free || s->should_munmap) {
2601 s->should_free = s->should_munmap = 0;
2602 s->data = NULL;
2603 }
eede7b7d
JK
2604}
2605
2606void diff_free_filespec_data(struct diff_filespec *s)
2607{
8ae92e63 2608 diff_free_filespec_blob(s);
6973dcae
JH
2609 free(s->cnt_data);
2610 s->cnt_data = NULL;
2611}
2612
4e218f54 2613static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
6973dcae
JH
2614 void *blob,
2615 unsigned long size,
2616 const unsigned char *sha1,
2617 int mode)
2618{
2619 int fd;
4e218f54 2620 struct strbuf buf = STRBUF_INIT;
003b33a8
DA
2621 struct strbuf template = STRBUF_INIT;
2622 char *path_dup = xstrdup(path);
2623 const char *base = basename(path_dup);
6973dcae 2624
003b33a8
DA
2625 /* Generate "XXXXXX_basename.ext" */
2626 strbuf_addstr(&template, "XXXXXX_");
2627 strbuf_addstr(&template, base);
2628
2629 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2630 strlen(base) + 1);
6973dcae 2631 if (fd < 0)
d824cbba 2632 die_errno("unable to create temp-file");
4e218f54
JS
2633 if (convert_to_working_tree(path,
2634 (const char *)blob, (size_t)size, &buf)) {
2635 blob = buf.buf;
2636 size = buf.len;
2637 }
93822c22 2638 if (write_in_full(fd, blob, size) != size)
0721c314 2639 die_errno("unable to write temp-file");
6973dcae
JH
2640 close(fd);
2641 temp->name = temp->tmp_path;
2642 strcpy(temp->hex, sha1_to_hex(sha1));
2643 temp->hex[40] = 0;
2644 sprintf(temp->mode, "%06o", mode);
4e218f54 2645 strbuf_release(&buf);
003b33a8
DA
2646 strbuf_release(&template);
2647 free(path_dup);
6973dcae
JH
2648}
2649
479b0ae8
JK
2650static struct diff_tempfile *prepare_temp_file(const char *name,
2651 struct diff_filespec *one)
6973dcae 2652{
479b0ae8
JK
2653 struct diff_tempfile *temp = claim_diff_tempfile();
2654
6973dcae
JH
2655 if (!DIFF_FILE_VALID(one)) {
2656 not_a_valid_file:
2657 /* A '-' entry produces this for file-2, and
2658 * a '+' entry produces this for file-1.
2659 */
2660 temp->name = "/dev/null";
2661 strcpy(temp->hex, ".");
2662 strcpy(temp->mode, ".");
479b0ae8
JK
2663 return temp;
2664 }
2665
2666 if (!remove_tempfile_installed) {
2667 atexit(remove_tempfile);
57b235a4 2668 sigchain_push_common(remove_tempfile_on_signal);
479b0ae8 2669 remove_tempfile_installed = 1;
6973dcae
JH
2670 }
2671
2672 if (!one->sha1_valid ||
1510fea7 2673 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
2674 struct stat st;
2675 if (lstat(name, &st) < 0) {
2676 if (errno == ENOENT)
2677 goto not_a_valid_file;
d824cbba 2678 die_errno("stat(%s)", name);
6973dcae
JH
2679 }
2680 if (S_ISLNK(st.st_mode)) {
3cd7388d
JK
2681 struct strbuf sb = STRBUF_INIT;
2682 if (strbuf_readlink(&sb, name, st.st_size) < 0)
0721c314 2683 die_errno("readlink(%s)", name);
3cd7388d 2684 prep_temp_blob(name, temp, sb.buf, sb.len,
6973dcae
JH
2685 (one->sha1_valid ?
2686 one->sha1 : null_sha1),
2687 (one->sha1_valid ?
2688 one->mode : S_IFLNK));
3cd7388d 2689 strbuf_release(&sb);
6973dcae
JH
2690 }
2691 else {
2692 /* we can borrow from the file in the work tree */
2693 temp->name = name;
2694 if (!one->sha1_valid)
2695 strcpy(temp->hex, sha1_to_hex(null_sha1));
2696 else
2697 strcpy(temp->hex, sha1_to_hex(one->sha1));
2698 /* Even though we may sometimes borrow the
2699 * contents from the work tree, we always want
2700 * one->mode. mode is trustworthy even when
2701 * !(one->sha1_valid), as long as
2702 * DIFF_FILE_VALID(one).
2703 */
2704 sprintf(temp->mode, "%06o", one->mode);
2705 }
479b0ae8 2706 return temp;
6973dcae
JH
2707 }
2708 else {
2709 if (diff_populate_filespec(one, 0))
2710 die("cannot read data blob for %s", one->path);
4e218f54 2711 prep_temp_blob(name, temp, one->data, one->size,
6973dcae
JH
2712 one->sha1, one->mode);
2713 }
479b0ae8 2714 return temp;
6973dcae
JH
2715}
2716
6973dcae
JH
2717/* An external diff command takes:
2718 *
2719 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2720 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2721 *
2722 */
2723static void run_external_diff(const char *pgm,
2724 const char *name,
2725 const char *other,
2726 struct diff_filespec *one,
2727 struct diff_filespec *two,
2728 const char *xfrm_msg,
2729 int complete_rewrite)
2730{
2731 const char *spawn_arg[10];
6973dcae 2732 int retval;
6973dcae
JH
2733 const char **arg = &spawn_arg[0];
2734
6973dcae 2735 if (one && two) {
479b0ae8
JK
2736 struct diff_tempfile *temp_one, *temp_two;
2737 const char *othername = (other ? other : name);
2738 temp_one = prepare_temp_file(name, one);
2739 temp_two = prepare_temp_file(othername, two);
6973dcae
JH
2740 *arg++ = pgm;
2741 *arg++ = name;
479b0ae8
JK
2742 *arg++ = temp_one->name;
2743 *arg++ = temp_one->hex;
2744 *arg++ = temp_one->mode;
2745 *arg++ = temp_two->name;
2746 *arg++ = temp_two->hex;
2747 *arg++ = temp_two->mode;
6973dcae
JH
2748 if (other) {
2749 *arg++ = other;
2750 *arg++ = xfrm_msg;
2751 }
2752 } else {
2753 *arg++ = pgm;
2754 *arg++ = name;
2755 }
2756 *arg = NULL;
d5535ec7 2757 fflush(NULL);
7ed7fac4 2758 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
6973dcae
JH
2759 remove_tempfile();
2760 if (retval) {
2761 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2762 exit(1);
2763 }
2764}
2765
b67b9612
JH
2766static int similarity_index(struct diff_filepair *p)
2767{
2768 return p->score * 100 / MAX_SCORE;
2769}
2770
2771static void fill_metainfo(struct strbuf *msg,
2772 const char *name,
2773 const char *other,
2774 struct diff_filespec *one,
2775 struct diff_filespec *two,
2776 struct diff_options *o,
37466447 2777 struct diff_filepair *p,
5977744d 2778 int *must_show_header,
37466447 2779 int use_color)
b67b9612 2780{
37466447
BW
2781 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2782 const char *reset = diff_get_color(use_color, DIFF_RESET);
7be57610
BY
2783 struct strbuf *msgbuf;
2784 char *line_prefix = "";
2785
296c6bb2 2786 *must_show_header = 1;
7be57610
BY
2787 if (o->output_prefix) {
2788 msgbuf = o->output_prefix(o, o->output_prefix_data);
2789 line_prefix = msgbuf->buf;
2790 }
b67b9612
JH
2791 strbuf_init(msg, PATH_MAX * 2 + 300);
2792 switch (p->status) {
2793 case DIFF_STATUS_COPIED:
98ad90fb
JH
2794 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2795 line_prefix, set, similarity_index(p));
2796 strbuf_addf(msg, "%s\n%s%scopy from ",
2797 reset, line_prefix, set);
b67b9612 2798 quote_c_style(name, msg, NULL, 0);
98ad90fb 2799 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
b67b9612 2800 quote_c_style(other, msg, NULL, 0);
37466447 2801 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
2802 break;
2803 case DIFF_STATUS_RENAMED:
98ad90fb
JH
2804 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2805 line_prefix, set, similarity_index(p));
2806 strbuf_addf(msg, "%s\n%s%srename from ",
2807 reset, line_prefix, set);
b67b9612 2808 quote_c_style(name, msg, NULL, 0);
98ad90fb
JH
2809 strbuf_addf(msg, "%s\n%s%srename to ",
2810 reset, line_prefix, set);
b67b9612 2811 quote_c_style(other, msg, NULL, 0);
37466447 2812 strbuf_addf(msg, "%s\n", reset);
b67b9612
JH
2813 break;
2814 case DIFF_STATUS_MODIFIED:
2815 if (p->score) {
98ad90fb
JH
2816 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2817 line_prefix,
37466447 2818 set, similarity_index(p), reset);
b67b9612
JH
2819 break;
2820 }
2821 /* fallthru */
2822 default:
296c6bb2 2823 *must_show_header = 0;
b67b9612
JH
2824 }
2825 if (one && two && hashcmp(one->sha1, two->sha1)) {
2826 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2827
2828 if (DIFF_OPT_TST(o, BINARY)) {
2829 mmfile_t mf;
2830 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2831 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2832 abbrev = 40;
2833 }
e13f38a3 2834 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
3e5a188f
JH
2835 find_unique_abbrev(one->sha1, abbrev));
2836 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
b67b9612
JH
2837 if (one->mode == two->mode)
2838 strbuf_addf(msg, " %06o", one->mode);
37466447 2839 strbuf_addf(msg, "%s\n", reset);
b67b9612 2840 }
b67b9612
JH
2841}
2842
6973dcae
JH
2843static void run_diff_cmd(const char *pgm,
2844 const char *name,
2845 const char *other,
cd676a51 2846 const char *attr_path,
6973dcae
JH
2847 struct diff_filespec *one,
2848 struct diff_filespec *two,
b67b9612 2849 struct strbuf *msg,
051308f6 2850 struct diff_options *o,
b67b9612 2851 struct diff_filepair *p)
6973dcae 2852{
b67b9612
JH
2853 const char *xfrm_msg = NULL;
2854 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
296c6bb2 2855 int must_show_header = 0;
b67b9612 2856
8f67f8ae 2857 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2858 pgm = NULL;
2859 else {
be58e70d
JK
2860 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2861 if (drv && drv->external)
2862 pgm = drv->external;
f1af60bd
JH
2863 }
2864
37466447
BW
2865 if (msg) {
2866 /*
2867 * don't use colors when the header is intended for an
2868 * external diff driver
2869 */
2870 fill_metainfo(msg, name, other, one, two, o, p,
5977744d 2871 &must_show_header,
daa0c3d9 2872 want_color(o->use_color) && !pgm);
37466447
BW
2873 xfrm_msg = msg->len ? msg->buf : NULL;
2874 }
2875
6973dcae
JH
2876 if (pgm) {
2877 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2878 complete_rewrite);
2879 return;
2880 }
2881 if (one && two)
2882 builtin_diff(name, other ? other : name,
296c6bb2
CC
2883 one, two, xfrm_msg, must_show_header,
2884 o, complete_rewrite);
6973dcae 2885 else
c0c77734 2886 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
2887}
2888
2889static void diff_fill_sha1_info(struct diff_filespec *one)
2890{
2891 if (DIFF_FILE_VALID(one)) {
2892 if (!one->sha1_valid) {
2893 struct stat st;
5332b2af
JS
2894 if (!strcmp(one->path, "-")) {
2895 hashcpy(one->sha1, null_sha1);
2896 return;
2897 }
6973dcae 2898 if (lstat(one->path, &st) < 0)
0721c314 2899 die_errno("stat '%s'", one->path);
6973dcae 2900 if (index_path(one->sha1, one->path, &st, 0))
d7530708 2901 die("cannot hash %s", one->path);
6973dcae
JH
2902 }
2903 }
2904 else
e702496e 2905 hashclr(one->sha1);
6973dcae
JH
2906}
2907
cd676a51
JH
2908static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2909{
2910 /* Strip the prefix but do not molest /dev/null and absolute paths */
d8faea9d 2911 if (*namep && **namep != '/') {
cd676a51 2912 *namep += prefix_length;
d8faea9d
JN
2913 if (**namep == '/')
2914 ++*namep;
2915 }
2916 if (*otherp && **otherp != '/') {
cd676a51 2917 *otherp += prefix_length;
d8faea9d
JN
2918 if (**otherp == '/')
2919 ++*otherp;
2920 }
cd676a51
JH
2921}
2922
6973dcae
JH
2923static void run_diff(struct diff_filepair *p, struct diff_options *o)
2924{
2925 const char *pgm = external_diff();
663af342 2926 struct strbuf msg;
663af342
PH
2927 struct diff_filespec *one = p->one;
2928 struct diff_filespec *two = p->two;
6973dcae
JH
2929 const char *name;
2930 const char *other;
cd676a51 2931 const char *attr_path;
663af342 2932
cd676a51
JH
2933 name = p->one->path;
2934 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2935 attr_path = name;
2936 if (o->prefix_length)
2937 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
2938
2939 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51 2940 run_diff_cmd(pgm, name, NULL, attr_path,
b67b9612 2941 NULL, NULL, NULL, o, p);
6973dcae
JH
2942 return;
2943 }
2944
6973dcae
JH
2945 diff_fill_sha1_info(one);
2946 diff_fill_sha1_info(two);
2947
6973dcae
JH
2948 if (!pgm &&
2949 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2950 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
b67b9612
JH
2951 /*
2952 * a filepair that changes between file and symlink
6973dcae
JH
2953 * needs to be split into deletion and creation.
2954 */
2955 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51 2956 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 2957 one, null, &msg, o, p);
6973dcae 2958 free(null);
b67b9612
JH
2959 strbuf_release(&msg);
2960
6973dcae 2961 null = alloc_filespec(one->path);
cd676a51 2962 run_diff_cmd(NULL, name, other, attr_path,
b67b9612 2963 null, two, &msg, o, p);
6973dcae
JH
2964 free(null);
2965 }
2966 else
cd676a51 2967 run_diff_cmd(pgm, name, other, attr_path,
b67b9612 2968 one, two, &msg, o, p);
6973dcae 2969
663af342 2970 strbuf_release(&msg);
6973dcae
JH
2971}
2972
2973static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2974 struct diffstat_t *diffstat)
2975{
2976 const char *name;
2977 const char *other;
710158e3 2978 int complete_rewrite = 0;
6973dcae
JH
2979
2980 if (DIFF_PAIR_UNMERGED(p)) {
2981 /* unmerged */
0d21efa5 2982 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2983 return;
2984 }
2985
2986 name = p->one->path;
2987 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2988
cd676a51
JH
2989 if (o->prefix_length)
2990 strip_prefix(o->prefix_length, &name, &other);
2991
6973dcae
JH
2992 diff_fill_sha1_info(p->one);
2993 diff_fill_sha1_info(p->two);
2994
710158e3
JH
2995 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2996 complete_rewrite = 1;
0d21efa5 2997 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2998}
2999
88246898
JS
3000static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3001{
3002 const char *name;
3003 const char *other;
cd676a51 3004 const char *attr_path;
88246898
JS
3005
3006 if (DIFF_PAIR_UNMERGED(p)) {
3007 /* unmerged */
3008 return;
3009 }
3010
3011 name = p->one->path;
3012 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
3013 attr_path = other ? other : name;
3014
3015 if (o->prefix_length)
3016 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
3017
3018 diff_fill_sha1_info(p->one);
3019 diff_fill_sha1_info(p->two);
3020
cd676a51 3021 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
3022}
3023
6973dcae
JH
3024void diff_setup(struct diff_options *options)
3025{
be4f2b40 3026 memcpy(options, &default_diff_options, sizeof(*options));
c0c77734
DB
3027
3028 options->file = stdout;
3029
6973dcae
JH
3030 options->line_termination = '\n';
3031 options->break_opt = -1;
3032 options->rename_limit = -1;
712d2c7d 3033 options->dirstat_permille = diff_dirstat_permille_default;
ee1e5412 3034 options->context = 3;
6973dcae
JH
3035
3036 options->change = diff_change;
3037 options->add_remove = diff_addremove;
f1c96261 3038 options->use_color = diff_use_color_default;
b68ea12e 3039 options->detect_rename = diff_detect_rename_default;
eab9a40b 3040
f89504dd
EC
3041 if (diff_no_prefix) {
3042 options->a_prefix = options->b_prefix = "";
3043 } else if (!diff_mnemonic_prefix) {
a5a818ee
JH
3044 options->a_prefix = "a/";
3045 options->b_prefix = "b/";
3046 }
6973dcae
JH
3047}
3048
3049int diff_setup_done(struct diff_options *options)
3050{
d7de00f7
TH
3051 int count = 0;
3052
3053 if (options->output_format & DIFF_FORMAT_NAME)
3054 count++;
3055 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3056 count++;
3057 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3058 count++;
3059 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3060 count++;
3061 if (count > 1)
3062 die("--name-only, --name-status, --check and -s are mutually exclusive");
3063
f245194f
JH
3064 /*
3065 * Most of the time we can say "there are changes"
3066 * only by checking if there are changed paths, but
3067 * --ignore-whitespace* options force us to look
97bf2a08 3068 * inside contents.
f245194f
JH
3069 */
3070
3071 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3072 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3073 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3074 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3075 else
3076 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3077
8f67f8ae 3078 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
3079 options->detect_rename = DIFF_DETECT_COPY;
3080
cd676a51
JH
3081 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3082 options->prefix = NULL;
3083 if (options->prefix)
3084 options->prefix_length = strlen(options->prefix);
3085 else
3086 options->prefix_length = 0;
3087
c6744349
TH
3088 if (options->output_format & (DIFF_FORMAT_NAME |
3089 DIFF_FORMAT_NAME_STATUS |
3090 DIFF_FORMAT_CHECKDIFF |
3091 DIFF_FORMAT_NO_OUTPUT))
3092 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 3093 DIFF_FORMAT_NUMSTAT |
c6744349 3094 DIFF_FORMAT_DIFFSTAT |
ebd124c6 3095 DIFF_FORMAT_SHORTSTAT |
7df7c019 3096 DIFF_FORMAT_DIRSTAT |
c6744349
TH
3097 DIFF_FORMAT_SUMMARY |
3098 DIFF_FORMAT_PATCH);
3099
6973dcae
JH
3100 /*
3101 * These cases always need recursive; we do not drop caller-supplied
3102 * recursive bits for other formats here.
3103 */
c6744349 3104 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 3105 DIFF_FORMAT_NUMSTAT |
c6744349 3106 DIFF_FORMAT_DIFFSTAT |
ebd124c6 3107 DIFF_FORMAT_SHORTSTAT |
7df7c019 3108 DIFF_FORMAT_DIRSTAT |
d7014dc0 3109 DIFF_FORMAT_SUMMARY |
c6744349 3110 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 3111 DIFF_OPT_SET(options, RECURSIVE);
5e363541 3112 /*
3969cf7d 3113 * Also pickaxe would not work very well if you do not say recursive
5e363541 3114 */
3969cf7d 3115 if (options->pickaxe)
8f67f8ae 3116 DIFF_OPT_SET(options, RECURSIVE);
ae6d5c1b
JL
3117 /*
3118 * When patches are generated, submodules diffed against the work tree
3119 * must be checked for dirtiness too so it can be shown in the output
3120 */
3121 if (options->output_format & DIFF_FORMAT_PATCH)
3122 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
5e363541 3123
6973dcae
JH
3124 if (options->detect_rename && options->rename_limit < 0)
3125 options->rename_limit = diff_rename_limit_default;
3126 if (options->setup & DIFF_SETUP_USE_CACHE) {
3127 if (!active_cache)
3128 /* read-cache does not die even when it fails
3129 * so it is safe for us to do this here. Also
3130 * it does not smudge active_cache or active_nr
3131 * when it fails, so we do not have to worry about
3132 * cleaning it up ourselves either.
3133 */
3134 read_cache();
3135 }
6973dcae
JH
3136 if (options->abbrev <= 0 || 40 < options->abbrev)
3137 options->abbrev = 40; /* full */
3138
68aacb2f
JH
3139 /*
3140 * It does not make sense to show the first hit we happened
3141 * to have found. It does not make sense not to return with
3142 * exit code in such a case either.
3143 */
90b19941 3144 if (DIFF_OPT_TST(options, QUICK)) {
68aacb2f 3145 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 3146 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
3147 }
3148
6973dcae
JH
3149 return 0;
3150}
3151
d2543b8e 3152static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
3153{
3154 char c, *eq;
3155 int len;
3156
3157 if (*arg != '-')
3158 return 0;
3159 c = *++arg;
3160 if (!c)
3161 return 0;
3162 if (c == arg_short) {
3163 c = *++arg;
3164 if (!c)
3165 return 1;
3166 if (val && isdigit(c)) {
3167 char *end;
3168 int n = strtoul(arg, &end, 10);
3169 if (*end)
3170 return 0;
3171 *val = n;
3172 return 1;
3173 }
3174 return 0;
3175 }
3176 if (c != '-')
3177 return 0;
3178 arg++;
3179 eq = strchr(arg, '=');
3180 if (eq)
3181 len = eq - arg;
3182 else
3183 len = strlen(arg);
3184 if (!len || strncmp(arg, arg_long, len))
3185 return 0;
3186 if (eq) {
3187 int n;
3188 char *end;
3189 if (!isdigit(*++eq))
3190 return 0;
3191 n = strtoul(eq, &end, 10);
3192 if (*end)
3193 return 0;
3194 *val = n;
3195 }
3196 return 1;
3197}
3198
16befb8b
JH
3199static int diff_scoreopt_parse(const char *opt);
3200
dea007fb
MM
3201static inline int short_opt(char opt, const char **argv,
3202 const char **optarg)
3203{
3204 const char *arg = argv[0];
3205 if (arg[0] != '-' || arg[1] != opt)
3206 return 0;
3207 if (arg[2] != '\0') {
3208 *optarg = arg + 2;
3209 return 1;
3210 }
3211 if (!argv[1])
3212 die("Option '%c' requires a value", opt);
3213 *optarg = argv[1];
3214 return 2;
3215}
3216
3217int parse_long_opt(const char *opt, const char **argv,
3218 const char **optarg)
3219{
3220 const char *arg = argv[0];
3221 if (arg[0] != '-' || arg[1] != '-')
3222 return 0;
3223 arg += strlen("--");
3224 if (prefixcmp(arg, opt))
3225 return 0;
3226 arg += strlen(opt);
3227 if (*arg == '=') { /* sticked form: --option=value */
3228 *optarg = arg + 1;
3229 return 1;
3230 }
3231 if (*arg != '\0')
3232 return 0;
3233 /* separate form: --option value */
3234 if (!argv[1])
3235 die("Option '--%s' requires a value", opt);
3236 *optarg = argv[1];
3237 return 2;
3238}
3239
4d7f7a4a
JN
3240static int stat_opt(struct diff_options *options, const char **av)
3241{
3242 const char *arg = av[0];
3243 char *end;
3244 int width = options->stat_width;
3245 int name_width = options->stat_name_width;
808e1db2 3246 int count = options->stat_count;
1e57208e 3247 int argcount = 1;
4d7f7a4a
JN
3248
3249 arg += strlen("--stat");
3250 end = (char *)arg;
3251
3252 switch (*arg) {
3253 case '-':
1e57208e
MM
3254 if (!prefixcmp(arg, "-width")) {
3255 arg += strlen("-width");
3256 if (*arg == '=')
3257 width = strtoul(arg + 1, &end, 10);
3258 else if (!*arg && !av[1])
3259 die("Option '--stat-width' requires a value");
3260 else if (!*arg) {
3261 width = strtoul(av[1], &end, 10);
3262 argcount = 2;
3263 }
3264 } else if (!prefixcmp(arg, "-name-width")) {
3265 arg += strlen("-name-width");
3266 if (*arg == '=')
3267 name_width = strtoul(arg + 1, &end, 10);
3268 else if (!*arg && !av[1])
3269 die("Option '--stat-name-width' requires a value");
3270 else if (!*arg) {
3271 name_width = strtoul(av[1], &end, 10);
3272 argcount = 2;
3273 }
808e1db2
MG
3274 } else if (!prefixcmp(arg, "-count")) {
3275 arg += strlen("-count");
3276 if (*arg == '=')
3277 count = strtoul(arg + 1, &end, 10);
3278 else if (!*arg && !av[1])
3279 die("Option '--stat-count' requires a value");
3280 else if (!*arg) {
3281 count = strtoul(av[1], &end, 10);
3282 argcount = 2;
3283 }
1e57208e 3284 }
4d7f7a4a
JN
3285 break;
3286 case '=':
3287 width = strtoul(arg+1, &end, 10);
3288 if (*end == ',')
3289 name_width = strtoul(end+1, &end, 10);
808e1db2
MG
3290 if (*end == ',')
3291 count = strtoul(end+1, &end, 10);
4d7f7a4a
JN
3292 }
3293
3294 /* Important! This checks all the error cases! */
3295 if (*end)
3296 return 0;
3297 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3298 options->stat_name_width = name_width;
3299 options->stat_width = width;
808e1db2 3300 options->stat_count = count;
1e57208e 3301 return argcount;
4d7f7a4a
JN
3302}
3303
333f3fb0
JH
3304static int parse_dirstat_opt(struct diff_options *options, const char *params)
3305{
51670fc8
JH
3306 struct strbuf errmsg = STRBUF_INIT;
3307 if (parse_dirstat_params(options, params, &errmsg))
7478ac57 3308 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
51670fc8
JH
3309 errmsg.buf);
3310 strbuf_release(&errmsg);
333f3fb0
JH
3311 /*
3312 * The caller knows a dirstat-related option is given from the command
3313 * line; allow it to say "return this_function();"
3314 */
3315 options->output_format |= DIFF_FORMAT_DIRSTAT;
3316 return 1;
3317}
3318
6973dcae
JH
3319int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3320{
3321 const char *arg = av[0];
dea007fb
MM
3322 const char *optarg;
3323 int argcount;
d054680c
PH
3324
3325 /* Output format options */
1c9eecff 3326 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
c6744349 3327 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 3328 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 3329 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
3330 else if (!strcmp(arg, "--raw"))
3331 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 3332 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 3333 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 3334 else if (!strcmp(arg, "--numstat"))
74e2abe5 3335 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 3336 else if (!strcmp(arg, "--shortstat"))
ebd124c6 3337 options->output_format |= DIFF_FORMAT_SHORTSTAT;
333f3fb0
JH
3338 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3339 return parse_dirstat_opt(options, "");
3340 else if (!prefixcmp(arg, "-X"))
3341 return parse_dirstat_opt(options, arg + 2);
3342 else if (!prefixcmp(arg, "--dirstat="))
3343 return parse_dirstat_opt(options, arg + 10);
3344 else if (!strcmp(arg, "--cumulative"))
3345 return parse_dirstat_opt(options, "cumulative");
3346 else if (!strcmp(arg, "--dirstat-by-file"))
3347 return parse_dirstat_opt(options, "files");
3348 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3349 parse_dirstat_opt(options, "files");
3350 return parse_dirstat_opt(options, arg + 18);
f88d225f 3351 }
d054680c
PH
3352 else if (!strcmp(arg, "--check"))
3353 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3354 else if (!strcmp(arg, "--summary"))
3355 options->output_format |= DIFF_FORMAT_SUMMARY;
3356 else if (!strcmp(arg, "--patch-with-stat"))
3357 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3358 else if (!strcmp(arg, "--name-only"))
3359 options->output_format |= DIFF_FORMAT_NAME;
3360 else if (!strcmp(arg, "--name-status"))
3361 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3362 else if (!strcmp(arg, "-s"))
3363 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
4d7f7a4a 3364 else if (!prefixcmp(arg, "--stat"))
808e1db2 3365 /* --stat, --stat-width, --stat-name-width, or --stat-count */
4d7f7a4a 3366 return stat_opt(options, av);
d054680c
PH
3367
3368 /* renames options */
37ab5156
KB
3369 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3370 !strcmp(arg, "--break-rewrites")) {
8f67f8ae 3371 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
07cd7265 3372 return error("invalid argument to -B: %s", arg+2);
6973dcae 3373 }
f611ddc7
YD
3374 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3375 !strcmp(arg, "--find-renames")) {
8f67f8ae 3376 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
07cd7265 3377 return error("invalid argument to -M: %s", arg+2);
6973dcae
JH
3378 options->detect_rename = DIFF_DETECT_RENAME;
3379 }
467ddc14
JH
3380 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3381 options->irreversible_delete = 1;
3382 }
f611ddc7
YD
3383 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3384 !strcmp(arg, "--find-copies")) {
ca6c0970 3385 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
3386 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3387 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
07cd7265 3388 return error("invalid argument to -C: %s", arg+2);
6973dcae
JH
3389 options->detect_rename = DIFF_DETECT_COPY;
3390 }
d054680c
PH
3391 else if (!strcmp(arg, "--no-renames"))
3392 options->detect_rename = 0;
cd676a51
JH
3393 else if (!strcmp(arg, "--relative"))
3394 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
3395 else if (!prefixcmp(arg, "--relative=")) {
3396 DIFF_OPT_SET(options, RELATIVE_NAME);
3397 options->prefix = arg + 11;
3398 }
d054680c
PH
3399
3400 /* xdiff options */
81b568c8
JH
3401 else if (!strcmp(arg, "--minimal"))
3402 DIFF_XDL_SET(options, NEED_MINIMAL);
3403 else if (!strcmp(arg, "--no-minimal"))
3404 DIFF_XDL_CLR(options, NEED_MINIMAL);
d054680c 3405 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
628d5c2b 3406 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
d054680c 3407 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
628d5c2b 3408 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
d054680c 3409 else if (!strcmp(arg, "--ignore-space-at-eol"))
628d5c2b 3410 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
34292bdd 3411 else if (!strcmp(arg, "--patience"))
628d5c2b 3412 DIFF_XDL_SET(options, PATIENCE_DIFF);
8c912eea
TRC
3413 else if (!strcmp(arg, "--histogram"))
3414 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
d054680c
PH
3415
3416 /* flags options */
3417 else if (!strcmp(arg, "--binary")) {
3418 options->output_format |= DIFF_FORMAT_PATCH;
3419 DIFF_OPT_SET(options, BINARY);
3420 }
3421 else if (!strcmp(arg, "--full-index"))
3422 DIFF_OPT_SET(options, FULL_INDEX);
3423 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3424 DIFF_OPT_SET(options, TEXT);
3425 else if (!strcmp(arg, "-R"))
3426 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 3427 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 3428 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 3429 else if (!strcmp(arg, "--follow"))
8f67f8ae 3430 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 3431 else if (!strcmp(arg, "--color"))
f1c96261 3432 options->use_color = 1;
73e9da01 3433 else if (!prefixcmp(arg, "--color=")) {
e269eb79 3434 int value = git_config_colorbool(NULL, arg+8);
daa0c3d9 3435 if (value < 0)
73e9da01 3436 return error("option `color' expects \"always\", \"auto\", or \"never\"");
daa0c3d9 3437 options->use_color = value;
73e9da01 3438 }
fef88bb0 3439 else if (!strcmp(arg, "--no-color"))
f1c96261 3440 options->use_color = 0;
628d5c2b 3441 else if (!strcmp(arg, "--color-words")) {
f1c96261 3442 options->use_color = 1;
882749a0 3443 options->word_diff = DIFF_WORDS_COLOR;
628d5c2b 3444 }
2b6a5417 3445 else if (!prefixcmp(arg, "--color-words=")) {
f1c96261 3446 options->use_color = 1;
882749a0 3447 options->word_diff = DIFF_WORDS_COLOR;
2b6a5417
JS
3448 options->word_regex = arg + 14;
3449 }
882749a0
TR
3450 else if (!strcmp(arg, "--word-diff")) {
3451 if (options->word_diff == DIFF_WORDS_NONE)
3452 options->word_diff = DIFF_WORDS_PLAIN;
3453 }
3454 else if (!prefixcmp(arg, "--word-diff=")) {
3455 const char *type = arg + 12;
3456 if (!strcmp(type, "plain"))
3457 options->word_diff = DIFF_WORDS_PLAIN;
3458 else if (!strcmp(type, "color")) {
f1c96261 3459 options->use_color = 1;
882749a0
TR
3460 options->word_diff = DIFF_WORDS_COLOR;
3461 }
3462 else if (!strcmp(type, "porcelain"))
3463 options->word_diff = DIFF_WORDS_PORCELAIN;
3464 else if (!strcmp(type, "none"))
3465 options->word_diff = DIFF_WORDS_NONE;
3466 else
3467 die("bad --word-diff argument: %s", type);
3468 }
dea007fb 3469 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
882749a0
TR
3470 if (options->word_diff == DIFF_WORDS_NONE)
3471 options->word_diff = DIFF_WORDS_PLAIN;
dea007fb
MM
3472 options->word_regex = optarg;
3473 return argcount;
882749a0 3474 }
41bbf9d5 3475 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 3476 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 3477 else if (!strcmp(arg, "--quiet"))
90b19941 3478 DIFF_OPT_SET(options, QUICK);
72909bef 3479 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 3480 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 3481 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 3482 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
e10ea812
JK
3483 else if (!strcmp(arg, "--textconv"))
3484 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3485 else if (!strcmp(arg, "--no-textconv"))
3486 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
aee9c7d6
JL
3487 else if (!strcmp(arg, "--ignore-submodules")) {
3488 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
46a958b3 3489 handle_ignore_submodules_arg(options, "all");
aee9c7d6
JL
3490 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3491 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
46a958b3 3492 handle_ignore_submodules_arg(options, arg + 20);
aee9c7d6 3493 } else if (!strcmp(arg, "--submodule"))
752c0c24
JS
3494 DIFF_OPT_SET(options, SUBMODULE_LOG);
3495 else if (!prefixcmp(arg, "--submodule=")) {
3496 if (!strcmp(arg + 12, "log"))
3497 DIFF_OPT_SET(options, SUBMODULE_LOG);
3498 }
d054680c
PH
3499
3500 /* misc options */
3501 else if (!strcmp(arg, "-z"))
3502 options->line_termination = 0;
dea007fb
MM
3503 else if ((argcount = short_opt('l', av, &optarg))) {
3504 options->rename_limit = strtoul(optarg, NULL, 10);
3505 return argcount;
3506 }
3507 else if ((argcount = short_opt('S', av, &optarg))) {
3508 options->pickaxe = optarg;
f506b8e8
JH
3509 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3510 return argcount;
3511 } else if ((argcount = short_opt('G', av, &optarg))) {
3512 options->pickaxe = optarg;
3513 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
dea007fb
MM
3514 return argcount;
3515 }
d054680c 3516 else if (!strcmp(arg, "--pickaxe-all"))
f506b8e8 3517 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
d054680c 3518 else if (!strcmp(arg, "--pickaxe-regex"))
f506b8e8 3519 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
dea007fb
MM
3520 else if ((argcount = short_opt('O', av, &optarg))) {
3521 options->orderfile = optarg;
3522 return argcount;
3523 }
3524 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3525 options->filter = optarg;
3526 return argcount;
3527 }
d054680c
PH
3528 else if (!strcmp(arg, "--abbrev"))
3529 options->abbrev = DEFAULT_ABBREV;
3530 else if (!prefixcmp(arg, "--abbrev=")) {
3531 options->abbrev = strtoul(arg + 9, NULL, 10);
3532 if (options->abbrev < MINIMUM_ABBREV)
3533 options->abbrev = MINIMUM_ABBREV;
3534 else if (40 < options->abbrev)
3535 options->abbrev = 40;
3536 }
dea007fb
MM
3537 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3538 options->a_prefix = optarg;
3539 return argcount;
3540 }
3541 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3542 options->b_prefix = optarg;
3543 return argcount;
3544 }
eab9a40b
JS
3545 else if (!strcmp(arg, "--no-prefix"))
3546 options->a_prefix = options->b_prefix = "";
6d0e674a
RS
3547 else if (opt_arg(arg, '\0', "inter-hunk-context",
3548 &options->interhunkcontext))
3549 ;
14937c2c
RS
3550 else if (!strcmp(arg, "-W"))
3551 DIFF_OPT_SET(options, FUNCCONTEXT);
3552 else if (!strcmp(arg, "--function-context"))
3553 DIFF_OPT_SET(options, FUNCCONTEXT);
3554 else if (!strcmp(arg, "--no-function-context"))
3555 DIFF_OPT_CLR(options, FUNCCONTEXT);
dea007fb
MM
3556 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3557 options->file = fopen(optarg, "w");
8324b977 3558 if (!options->file)
9ec26eb7 3559 die_errno("Could not open '%s'", optarg);
c0c77734 3560 options->close_file = 1;
dea007fb 3561 return argcount;
c0c77734 3562 } else
6973dcae
JH
3563 return 0;
3564 return 1;
3565}
3566
10ae7526 3567int parse_rename_score(const char **cp_p)
6973dcae
JH
3568{
3569 unsigned long num, scale;
3570 int ch, dot;