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core.hidedotfiles: hide '.git' dir by default
[git/dscho.git] / diff.c
blob3550c18e390cac7a3cce8fcf93074c7178bf1994
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_dirstat_permille_default = 30;
35 static struct diff_options default_diff_options;
36
37 static char diff_colors[][COLOR_MAXLEN] = {
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 */
46 GIT_COLOR_NORMAL, /* FUNCINFO */
47 };
48
49 static 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;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
72 {
73 const char *p = params;
74 int p_len, ret = 0;
75
76 while (*p) {
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
81 } else if (!memcmp(p, "lines", p_len)) {
82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
84 } else if (!memcmp(p, "files", p_len)) {
85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
87 } else if (!memcmp(p, "noncumulative", p_len)) {
88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
89 } else if (!memcmp(p, "cumulative", p_len)) {
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
95 /* only use first digit */
96 permille += *end - '0';
97 /* .. and ignore any further digits */
98 while (isdigit(*++end))
99 ; /* nothing */
100 }
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
105 p_len, p);
106 ret++;
107 }
108 } else {
109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
110 p_len, p);
111 ret++;
112 }
113
114 p += p_len;
115
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
121
122 static 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
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 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 diff_detect_rename_default = git_config_rename(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
163
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
169
170 return git_diff_basic_config(var, value, cb);
171 }
172
173 int git_diff_basic_config(const char *var, const char *value, void *cb)
174 {
175 if (!strcmp(var, "diff.renamelimit")) {
176 diff_rename_limit_default = git_config_int(var, value);
177 return 0;
178 }
179
180 if (userdiff_config(var, value) < 0)
181 return -1;
182
183 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
184 int slot = parse_diff_color_slot(var, 11);
185 if (slot < 0)
186 return 0;
187 if (!value)
188 return config_error_nonbool(var);
189 color_parse(value, var, diff_colors[slot]);
190 return 0;
191 }
192
193 /* like GNU diff's --suppress-blank-empty option */
194 if (!strcmp(var, "diff.suppressblankempty") ||
195 /* for backwards compatibility */
196 !strcmp(var, "diff.suppress-blank-empty")) {
197 diff_suppress_blank_empty = git_config_bool(var, value);
198 return 0;
199 }
200
201 if (!strcmp(var, "diff.dirstat")) {
202 struct strbuf errmsg = STRBUF_INIT;
203 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
204 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
205 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
206 errmsg.buf);
207 strbuf_release(&errmsg);
208 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
209 return 0;
210 }
211
212 if (!prefixcmp(var, "submodule."))
213 return parse_submodule_config_option(var, value);
214
215 return git_default_config(var, value, cb);
216 }
217
218 static char *quote_two(const char *one, const char *two)
219 {
220 int need_one = quote_c_style(one, NULL, NULL, 1);
221 int need_two = quote_c_style(two, NULL, NULL, 1);
222 struct strbuf res = STRBUF_INIT;
223
224 if (need_one + need_two) {
225 strbuf_addch(&res, '"');
226 quote_c_style(one, &res, NULL, 1);
227 quote_c_style(two, &res, NULL, 1);
228 strbuf_addch(&res, '"');
229 } else {
230 strbuf_addstr(&res, one);
231 strbuf_addstr(&res, two);
232 }
233 return strbuf_detach(&res, NULL);
234 }
235
236 static const char *external_diff(void)
237 {
238 static const char *external_diff_cmd = NULL;
239 static int done_preparing = 0;
240
241 if (done_preparing)
242 return external_diff_cmd;
243 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
244 if (!external_diff_cmd)
245 external_diff_cmd = external_diff_cmd_cfg;
246 done_preparing = 1;
247 return external_diff_cmd;
248 }
249
250 static struct diff_tempfile {
251 const char *name; /* filename external diff should read from */
252 char hex[41];
253 char mode[10];
254 char tmp_path[PATH_MAX];
255 } diff_temp[2];
256
257 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
258
259 struct emit_callback {
260 int color_diff;
261 unsigned ws_rule;
262 int blank_at_eof_in_preimage;
263 int blank_at_eof_in_postimage;
264 int lno_in_preimage;
265 int lno_in_postimage;
266 sane_truncate_fn truncate;
267 const char **label_path;
268 struct diff_words_data *diff_words;
269 struct diff_options *opt;
270 int *found_changesp;
271 struct strbuf *header;
272 };
273
274 static int count_lines(const char *data, int size)
275 {
276 int count, ch, completely_empty = 1, nl_just_seen = 0;
277 count = 0;
278 while (0 < size--) {
279 ch = *data++;
280 if (ch == '\n') {
281 count++;
282 nl_just_seen = 1;
283 completely_empty = 0;
284 }
285 else {
286 nl_just_seen = 0;
287 completely_empty = 0;
288 }
289 }
290 if (completely_empty)
291 return 0;
292 if (!nl_just_seen)
293 count++; /* no trailing newline */
294 return count;
295 }
296
297 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
298 {
299 if (!DIFF_FILE_VALID(one)) {
300 mf->ptr = (char *)""; /* does not matter */
301 mf->size = 0;
302 return 0;
303 }
304 else if (diff_populate_filespec(one, 0))
305 return -1;
306
307 mf->ptr = one->data;
308 mf->size = one->size;
309 return 0;
310 }
311
312 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
313 static unsigned long diff_filespec_size(struct diff_filespec *one)
314 {
315 if (!DIFF_FILE_VALID(one))
316 return 0;
317 diff_populate_filespec(one, 1);
318 return one->size;
319 }
320
321 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
322 {
323 char *ptr = mf->ptr;
324 long size = mf->size;
325 int cnt = 0;
326
327 if (!size)
328 return cnt;
329 ptr += size - 1; /* pointing at the very end */
330 if (*ptr != '\n')
331 ; /* incomplete line */
332 else
333 ptr--; /* skip the last LF */
334 while (mf->ptr < ptr) {
335 char *prev_eol;
336 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
337 if (*prev_eol == '\n')
338 break;
339 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
340 break;
341 cnt++;
342 ptr = prev_eol - 1;
343 }
344 return cnt;
345 }
346
347 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
348 struct emit_callback *ecbdata)
349 {
350 int l1, l2, at;
351 unsigned ws_rule = ecbdata->ws_rule;
352 l1 = count_trailing_blank(mf1, ws_rule);
353 l2 = count_trailing_blank(mf2, ws_rule);
354 if (l2 <= l1) {
355 ecbdata->blank_at_eof_in_preimage = 0;
356 ecbdata->blank_at_eof_in_postimage = 0;
357 return;
358 }
359 at = count_lines(mf1->ptr, mf1->size);
360 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
361
362 at = count_lines(mf2->ptr, mf2->size);
363 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
364 }
365
366 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
367 int first, const char *line, int len)
368 {
369 int has_trailing_newline, has_trailing_carriage_return;
370 int nofirst;
371 FILE *file = o->file;
372
373 if (o->output_prefix) {
374 struct strbuf *msg = NULL;
375 msg = o->output_prefix(o, o->output_prefix_data);
376 assert(msg);
377 fwrite(msg->buf, msg->len, 1, file);
378 }
379
380 if (len == 0) {
381 has_trailing_newline = (first == '\n');
382 has_trailing_carriage_return = (!has_trailing_newline &&
383 (first == '\r'));
384 nofirst = has_trailing_newline || has_trailing_carriage_return;
385 } else {
386 has_trailing_newline = (len > 0 && line[len-1] == '\n');
387 if (has_trailing_newline)
388 len--;
389 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
390 if (has_trailing_carriage_return)
391 len--;
392 nofirst = 0;
393 }
394
395 if (len || !nofirst) {
396 fputs(set, file);
397 if (!nofirst)
398 fputc(first, file);
399 fwrite(line, len, 1, file);
400 fputs(reset, file);
401 }
402 if (has_trailing_carriage_return)
403 fputc('\r', file);
404 if (has_trailing_newline)
405 fputc('\n', file);
406 }
407
408 static void emit_line(struct diff_options *o, const char *set, const char *reset,
409 const char *line, int len)
410 {
411 emit_line_0(o, set, reset, line[0], line+1, len-1);
412 }
413
414 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
415 {
416 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
417 ecbdata->blank_at_eof_in_preimage &&
418 ecbdata->blank_at_eof_in_postimage &&
419 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
420 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
421 return 0;
422 return ws_blank_line(line, len, ecbdata->ws_rule);
423 }
424
425 static void emit_add_line(const char *reset,
426 struct emit_callback *ecbdata,
427 const char *line, int len)
428 {
429 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
430 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
431
432 if (!*ws)
433 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
434 else if (new_blank_line_at_eof(ecbdata, line, len))
435 /* Blank line at EOF - paint '+' as well */
436 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
437 else {
438 /* Emit just the prefix, then the rest. */
439 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
440 ws_check_emit(line, len, ecbdata->ws_rule,
441 ecbdata->opt->file, set, reset, ws);
442 }
443 }
444
445 static void emit_hunk_header(struct emit_callback *ecbdata,
446 const char *line, int len)
447 {
448 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
449 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
450 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
451 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
452 static const char atat[2] = { '@', '@' };
453 const char *cp, *ep;
454 struct strbuf msgbuf = STRBUF_INIT;
455 int org_len = len;
456 int i = 1;
457
458 /*
459 * As a hunk header must begin with "@@ -<old>, +<new> @@",
460 * it always is at least 10 bytes long.
461 */
462 if (len < 10 ||
463 memcmp(line, atat, 2) ||
464 !(ep = memmem(line + 2, len - 2, atat, 2))) {
465 emit_line(ecbdata->opt, plain, reset, line, len);
466 return;
467 }
468 ep += 2; /* skip over @@ */
469
470 /* The hunk header in fraginfo color */
471 strbuf_add(&msgbuf, frag, strlen(frag));
472 strbuf_add(&msgbuf, line, ep - line);
473 strbuf_add(&msgbuf, reset, strlen(reset));
474
475 /*
476 * trailing "\r\n"
477 */
478 for ( ; i < 3; i++)
479 if (line[len - i] == '\r' || line[len - i] == '\n')
480 len--;
481
482 /* blank before the func header */
483 for (cp = ep; ep - line < len; ep++)
484 if (*ep != ' ' && *ep != '\t')
485 break;
486 if (ep != cp) {
487 strbuf_add(&msgbuf, plain, strlen(plain));
488 strbuf_add(&msgbuf, cp, ep - cp);
489 strbuf_add(&msgbuf, reset, strlen(reset));
490 }
491
492 if (ep < line + len) {
493 strbuf_add(&msgbuf, func, strlen(func));
494 strbuf_add(&msgbuf, ep, line + len - ep);
495 strbuf_add(&msgbuf, reset, strlen(reset));
496 }
497
498 strbuf_add(&msgbuf, line + len, org_len - len);
499 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
500 strbuf_release(&msgbuf);
501 }
502
503 static struct diff_tempfile *claim_diff_tempfile(void) {
504 int i;
505 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
506 if (!diff_temp[i].name)
507 return diff_temp + i;
508 die("BUG: diff is failing to clean up its tempfiles");
509 }
510
511 static int remove_tempfile_installed;
512
513 static void remove_tempfile(void)
514 {
515 int i;
516 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
517 if (diff_temp[i].name == diff_temp[i].tmp_path)
518 unlink_or_warn(diff_temp[i].name);
519 diff_temp[i].name = NULL;
520 }
521 }
522
523 static void remove_tempfile_on_signal(int signo)
524 {
525 remove_tempfile();
526 sigchain_pop(signo);
527 raise(signo);
528 }
529
530 static void print_line_count(FILE *file, int count)
531 {
532 switch (count) {
533 case 0:
534 fprintf(file, "0,0");
535 break;
536 case 1:
537 fprintf(file, "1");
538 break;
539 default:
540 fprintf(file, "1,%d", count);
541 break;
542 }
543 }
544
545 static void emit_rewrite_lines(struct emit_callback *ecb,
546 int prefix, const char *data, int size)
547 {
548 const char *endp = NULL;
549 static const char *nneof = " No newline at end of file\n";
550 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
551 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
552
553 while (0 < size) {
554 int len;
555
556 endp = memchr(data, '\n', size);
557 len = endp ? (endp - data + 1) : size;
558 if (prefix != '+') {
559 ecb->lno_in_preimage++;
560 emit_line_0(ecb->opt, old, reset, '-',
561 data, len);
562 } else {
563 ecb->lno_in_postimage++;
564 emit_add_line(reset, ecb, data, len);
565 }
566 size -= len;
567 data += len;
568 }
569 if (!endp) {
570 const char *plain = diff_get_color(ecb->color_diff,
571 DIFF_PLAIN);
572 emit_line_0(ecb->opt, plain, reset, '\\',
573 nneof, strlen(nneof));
574 }
575 }
576
577 static void emit_rewrite_diff(const char *name_a,
578 const char *name_b,
579 struct diff_filespec *one,
580 struct diff_filespec *two,
581 struct userdiff_driver *textconv_one,
582 struct userdiff_driver *textconv_two,
583 struct diff_options *o)
584 {
585 int lc_a, lc_b;
586 const char *name_a_tab, *name_b_tab;
587 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
588 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
589 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
590 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
591 const char *a_prefix, *b_prefix;
592 char *data_one, *data_two;
593 size_t size_one, size_two;
594 struct emit_callback ecbdata;
595 char *line_prefix = "";
596 struct strbuf *msgbuf;
597
598 if (o && o->output_prefix) {
599 msgbuf = o->output_prefix(o, o->output_prefix_data);
600 line_prefix = msgbuf->buf;
601 }
602
603 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
604 a_prefix = o->b_prefix;
605 b_prefix = o->a_prefix;
606 } else {
607 a_prefix = o->a_prefix;
608 b_prefix = o->b_prefix;
609 }
610
611 name_a += (*name_a == '/');
612 name_b += (*name_b == '/');
613 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
614 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
615
616 strbuf_reset(&a_name);
617 strbuf_reset(&b_name);
618 quote_two_c_style(&a_name, a_prefix, name_a, 0);
619 quote_two_c_style(&b_name, b_prefix, name_b, 0);
620
621 size_one = fill_textconv(textconv_one, one, &data_one);
622 size_two = fill_textconv(textconv_two, two, &data_two);
623
624 memset(&ecbdata, 0, sizeof(ecbdata));
625 ecbdata.color_diff = want_color(o->use_color);
626 ecbdata.found_changesp = &o->found_changes;
627 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
628 ecbdata.opt = o;
629 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
630 mmfile_t mf1, mf2;
631 mf1.ptr = (char *)data_one;
632 mf2.ptr = (char *)data_two;
633 mf1.size = size_one;
634 mf2.size = size_two;
635 check_blank_at_eof(&mf1, &mf2, &ecbdata);
636 }
637 ecbdata.lno_in_preimage = 1;
638 ecbdata.lno_in_postimage = 1;
639
640 lc_a = count_lines(data_one, size_one);
641 lc_b = count_lines(data_two, size_two);
642 fprintf(o->file,
643 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
644 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
645 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
646 line_prefix, fraginfo);
647 if (!o->irreversible_delete)
648 print_line_count(o->file, lc_a);
649 else
650 fprintf(o->file, "?,?");
651 fprintf(o->file, " +");
652 print_line_count(o->file, lc_b);
653 fprintf(o->file, " @@%s\n", reset);
654 if (lc_a && !o->irreversible_delete)
655 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
656 if (lc_b)
657 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
658 if (textconv_one)
659 free((char *)data_one);
660 if (textconv_two)
661 free((char *)data_two);
662 }
663
664 struct diff_words_buffer {
665 mmfile_t text;
666 long alloc;
667 struct diff_words_orig {
668 const char *begin, *end;
669 } *orig;
670 int orig_nr, orig_alloc;
671 };
672
673 static void diff_words_append(char *line, unsigned long len,
674 struct diff_words_buffer *buffer)
675 {
676 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
677 line++;
678 len--;
679 memcpy(buffer->text.ptr + buffer->text.size, line, len);
680 buffer->text.size += len;
681 buffer->text.ptr[buffer->text.size] = '\0';
682 }
683
684 struct diff_words_style_elem {
685 const char *prefix;
686 const char *suffix;
687 const char *color; /* NULL; filled in by the setup code if
688 * color is enabled */
689 };
690
691 struct diff_words_style {
692 enum diff_words_type type;
693 struct diff_words_style_elem new, old, ctx;
694 const char *newline;
695 };
696
697 static struct diff_words_style diff_words_styles[] = {
698 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
699 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
700 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
701 };
702
703 struct diff_words_data {
704 struct diff_words_buffer minus, plus;
705 const char *current_plus;
706 int last_minus;
707 struct diff_options *opt;
708 regex_t *word_regex;
709 enum diff_words_type type;
710 struct diff_words_style *style;
711 };
712
713 static int fn_out_diff_words_write_helper(FILE *fp,
714 struct diff_words_style_elem *st_el,
715 const char *newline,
716 size_t count, const char *buf,
717 const char *line_prefix)
718 {
719 int print = 0;
720
721 while (count) {
722 char *p = memchr(buf, '\n', count);
723 if (print)
724 fputs(line_prefix, fp);
725 if (p != buf) {
726 if (st_el->color && fputs(st_el->color, fp) < 0)
727 return -1;
728 if (fputs(st_el->prefix, fp) < 0 ||
729 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
730 fputs(st_el->suffix, fp) < 0)
731 return -1;
732 if (st_el->color && *st_el->color
733 && fputs(GIT_COLOR_RESET, fp) < 0)
734 return -1;
735 }
736 if (!p)
737 return 0;
738 if (fputs(newline, fp) < 0)
739 return -1;
740 count -= p + 1 - buf;
741 buf = p + 1;
742 print = 1;
743 }
744 return 0;
745 }
746
747 /*
748 * '--color-words' algorithm can be described as:
749 *
750 * 1. collect a the minus/plus lines of a diff hunk, divided into
751 * minus-lines and plus-lines;
752 *
753 * 2. break both minus-lines and plus-lines into words and
754 * place them into two mmfile_t with one word for each line;
755 *
756 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
757 *
758 * And for the common parts of the both file, we output the plus side text.
759 * diff_words->current_plus is used to trace the current position of the plus file
760 * which printed. diff_words->last_minus is used to trace the last minus word
761 * printed.
762 *
763 * For '--graph' to work with '--color-words', we need to output the graph prefix
764 * on each line of color words output. Generally, there are two conditions on
765 * which we should output the prefix.
766 *
767 * 1. diff_words->last_minus == 0 &&
768 * diff_words->current_plus == diff_words->plus.text.ptr
769 *
770 * that is: the plus text must start as a new line, and if there is no minus
771 * word printed, a graph prefix must be printed.
772 *
773 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
774 * *(diff_words->current_plus - 1) == '\n'
775 *
776 * that is: a graph prefix must be printed following a '\n'
777 */
778 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
779 {
780 if ((diff_words->last_minus == 0 &&
781 diff_words->current_plus == diff_words->plus.text.ptr) ||
782 (diff_words->current_plus > diff_words->plus.text.ptr &&
783 *(diff_words->current_plus - 1) == '\n')) {
784 return 1;
785 } else {
786 return 0;
787 }
788 }
789
790 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
791 {
792 struct diff_words_data *diff_words = priv;
793 struct diff_words_style *style = diff_words->style;
794 int minus_first, minus_len, plus_first, plus_len;
795 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
796 struct diff_options *opt = diff_words->opt;
797 struct strbuf *msgbuf;
798 char *line_prefix = "";
799
800 if (line[0] != '@' || parse_hunk_header(line, len,
801 &minus_first, &minus_len, &plus_first, &plus_len))
802 return;
803
804 assert(opt);
805 if (opt->output_prefix) {
806 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
807 line_prefix = msgbuf->buf;
808 }
809
810 /* POSIX requires that first be decremented by one if len == 0... */
811 if (minus_len) {
812 minus_begin = diff_words->minus.orig[minus_first].begin;
813 minus_end =
814 diff_words->minus.orig[minus_first + minus_len - 1].end;
815 } else
816 minus_begin = minus_end =
817 diff_words->minus.orig[minus_first].end;
818
819 if (plus_len) {
820 plus_begin = diff_words->plus.orig[plus_first].begin;
821 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
822 } else
823 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
824
825 if (color_words_output_graph_prefix(diff_words)) {
826 fputs(line_prefix, diff_words->opt->file);
827 }
828 if (diff_words->current_plus != plus_begin) {
829 fn_out_diff_words_write_helper(diff_words->opt->file,
830 &style->ctx, style->newline,
831 plus_begin - diff_words->current_plus,
832 diff_words->current_plus, line_prefix);
833 if (*(plus_begin - 1) == '\n')
834 fputs(line_prefix, diff_words->opt->file);
835 }
836 if (minus_begin != minus_end) {
837 fn_out_diff_words_write_helper(diff_words->opt->file,
838 &style->old, style->newline,
839 minus_end - minus_begin, minus_begin,
840 line_prefix);
841 }
842 if (plus_begin != plus_end) {
843 fn_out_diff_words_write_helper(diff_words->opt->file,
844 &style->new, style->newline,
845 plus_end - plus_begin, plus_begin,
846 line_prefix);
847 }
848
849 diff_words->current_plus = plus_end;
850 diff_words->last_minus = minus_first;
851 }
852
853 /* This function starts looking at *begin, and returns 0 iff a word was found. */
854 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
855 int *begin, int *end)
856 {
857 if (word_regex && *begin < buffer->size) {
858 regmatch_t match[1];
859 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
860 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
861 '\n', match[0].rm_eo - match[0].rm_so);
862 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
863 *begin += match[0].rm_so;
864 return *begin >= *end;
865 }
866 return -1;
867 }
868
869 /* find the next word */
870 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
871 (*begin)++;
872 if (*begin >= buffer->size)
873 return -1;
874
875 /* find the end of the word */
876 *end = *begin + 1;
877 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
878 (*end)++;
879
880 return 0;
881 }
882
883 /*
884 * This function splits the words in buffer->text, stores the list with
885 * newline separator into out, and saves the offsets of the original words
886 * in buffer->orig.
887 */
888 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
889 regex_t *word_regex)
890 {
891 int i, j;
892 long alloc = 0;
893
894 out->size = 0;
895 out->ptr = NULL;
896
897 /* fake an empty "0th" word */
898 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
899 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
900 buffer->orig_nr = 1;
901
902 for (i = 0; i < buffer->text.size; i++) {
903 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
904 return;
905
906 /* store original boundaries */
907 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
908 buffer->orig_alloc);
909 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
910 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
911 buffer->orig_nr++;
912
913 /* store one word */
914 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
915 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
916 out->ptr[out->size + j - i] = '\n';
917 out->size += j - i + 1;
918
919 i = j - 1;
920 }
921 }
922
923 /* this executes the word diff on the accumulated buffers */
924 static void diff_words_show(struct diff_words_data *diff_words)
925 {
926 xpparam_t xpp;
927 xdemitconf_t xecfg;
928 mmfile_t minus, plus;
929 struct diff_words_style *style = diff_words->style;
930
931 struct diff_options *opt = diff_words->opt;
932 struct strbuf *msgbuf;
933 char *line_prefix = "";
934
935 assert(opt);
936 if (opt->output_prefix) {
937 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
938 line_prefix = msgbuf->buf;
939 }
940
941 /* special case: only removal */
942 if (!diff_words->plus.text.size) {
943 fputs(line_prefix, diff_words->opt->file);
944 fn_out_diff_words_write_helper(diff_words->opt->file,
945 &style->old, style->newline,
946 diff_words->minus.text.size,
947 diff_words->minus.text.ptr, line_prefix);
948 diff_words->minus.text.size = 0;
949 return;
950 }
951
952 diff_words->current_plus = diff_words->plus.text.ptr;
953 diff_words->last_minus = 0;
954
955 memset(&xpp, 0, sizeof(xpp));
956 memset(&xecfg, 0, sizeof(xecfg));
957 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
958 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
959 xpp.flags = 0;
960 /* as only the hunk header will be parsed, we need a 0-context */
961 xecfg.ctxlen = 0;
962 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
963 &xpp, &xecfg);
964 free(minus.ptr);
965 free(plus.ptr);
966 if (diff_words->current_plus != diff_words->plus.text.ptr +
967 diff_words->plus.text.size) {
968 if (color_words_output_graph_prefix(diff_words))
969 fputs(line_prefix, diff_words->opt->file);
970 fn_out_diff_words_write_helper(diff_words->opt->file,
971 &style->ctx, style->newline,
972 diff_words->plus.text.ptr + diff_words->plus.text.size
973 - diff_words->current_plus, diff_words->current_plus,
974 line_prefix);
975 }
976 diff_words->minus.text.size = diff_words->plus.text.size = 0;
977 }
978
979 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
980 static void diff_words_flush(struct emit_callback *ecbdata)
981 {
982 if (ecbdata->diff_words->minus.text.size ||
983 ecbdata->diff_words->plus.text.size)
984 diff_words_show(ecbdata->diff_words);
985 }
986
987 static void free_diff_words_data(struct emit_callback *ecbdata)
988 {
989 if (ecbdata->diff_words) {
990 diff_words_flush(ecbdata);
991 free (ecbdata->diff_words->minus.text.ptr);
992 free (ecbdata->diff_words->minus.orig);
993 free (ecbdata->diff_words->plus.text.ptr);
994 free (ecbdata->diff_words->plus.orig);
995 if (ecbdata->diff_words->word_regex) {
996 regfree(ecbdata->diff_words->word_regex);
997 free(ecbdata->diff_words->word_regex);
998 }
999 free(ecbdata->diff_words);
1000 ecbdata->diff_words = NULL;
1001 }
1002 }
1003
1004 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1005 {
1006 if (want_color(diff_use_color))
1007 return diff_colors[ix];
1008 return "";
1009 }
1010
1011 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1012 {
1013 const char *cp;
1014 unsigned long allot;
1015 size_t l = len;
1016
1017 if (ecb->truncate)
1018 return ecb->truncate(line, len);
1019 cp = line;
1020 allot = l;
1021 while (0 < l) {
1022 (void) utf8_width(&cp, &l);
1023 if (!cp)
1024 break; /* truncated in the middle? */
1025 }
1026 return allot - l;
1027 }
1028
1029 static void find_lno(const char *line, struct emit_callback *ecbdata)
1030 {
1031 const char *p;
1032 ecbdata->lno_in_preimage = 0;
1033 ecbdata->lno_in_postimage = 0;
1034 p = strchr(line, '-');
1035 if (!p)
1036 return; /* cannot happen */
1037 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1038 p = strchr(p, '+');
1039 if (!p)
1040 return; /* cannot happen */
1041 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1042 }
1043
1044 static void fn_out_consume(void *priv, char *line, unsigned long len)
1045 {
1046 struct emit_callback *ecbdata = priv;
1047 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1048 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1049 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1050 struct diff_options *o = ecbdata->opt;
1051 char *line_prefix = "";
1052 struct strbuf *msgbuf;
1053
1054 if (o && o->output_prefix) {
1055 msgbuf = o->output_prefix(o, o->output_prefix_data);
1056 line_prefix = msgbuf->buf;
1057 }
1058
1059 if (ecbdata->header) {
1060 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1061 strbuf_reset(ecbdata->header);
1062 ecbdata->header = NULL;
1063 }
1064 *(ecbdata->found_changesp) = 1;
1065
1066 if (ecbdata->label_path[0]) {
1067 const char *name_a_tab, *name_b_tab;
1068
1069 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1070 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1071
1072 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1073 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1074 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1075 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1076 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1077 }
1078
1079 if (diff_suppress_blank_empty
1080 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1081 line[0] = '\n';
1082 len = 1;
1083 }
1084
1085 if (line[0] == '@') {
1086 if (ecbdata->diff_words)
1087 diff_words_flush(ecbdata);
1088 len = sane_truncate_line(ecbdata, line, len);
1089 find_lno(line, ecbdata);
1090 emit_hunk_header(ecbdata, line, len);
1091 if (line[len-1] != '\n')
1092 putc('\n', ecbdata->opt->file);
1093 return;
1094 }
1095
1096 if (len < 1) {
1097 emit_line(ecbdata->opt, reset, reset, line, len);
1098 if (ecbdata->diff_words
1099 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1100 fputs("~\n", ecbdata->opt->file);
1101 return;
1102 }
1103
1104 if (ecbdata->diff_words) {
1105 if (line[0] == '-') {
1106 diff_words_append(line, len,
1107 &ecbdata->diff_words->minus);
1108 return;
1109 } else if (line[0] == '+') {
1110 diff_words_append(line, len,
1111 &ecbdata->diff_words->plus);
1112 return;
1113 } else if (!prefixcmp(line, "\\ ")) {
1114 /*
1115 * Eat the "no newline at eof" marker as if we
1116 * saw a "+" or "-" line with nothing on it,
1117 * and return without diff_words_flush() to
1118 * defer processing. If this is the end of
1119 * preimage, more "+" lines may come after it.
1120 */
1121 return;
1122 }
1123 diff_words_flush(ecbdata);
1124 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1125 emit_line(ecbdata->opt, plain, reset, line, len);
1126 fputs("~\n", ecbdata->opt->file);
1127 } else {
1128 /*
1129 * Skip the prefix character, if any. With
1130 * diff_suppress_blank_empty, there may be
1131 * none.
1132 */
1133 if (line[0] != '\n') {
1134 line++;
1135 len--;
1136 }
1137 emit_line(ecbdata->opt, plain, reset, line, len);
1138 }
1139 return;
1140 }
1141
1142 if (line[0] != '+') {
1143 const char *color =
1144 diff_get_color(ecbdata->color_diff,
1145 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1146 ecbdata->lno_in_preimage++;
1147 if (line[0] == ' ')
1148 ecbdata->lno_in_postimage++;
1149 emit_line(ecbdata->opt, color, reset, line, len);
1150 } else {
1151 ecbdata->lno_in_postimage++;
1152 emit_add_line(reset, ecbdata, line + 1, len - 1);
1153 }
1154 }
1155
1156 static char *pprint_rename(const char *a, const char *b)
1157 {
1158 const char *old = a;
1159 const char *new = b;
1160 struct strbuf name = STRBUF_INIT;
1161 int pfx_length, sfx_length;
1162 int len_a = strlen(a);
1163 int len_b = strlen(b);
1164 int a_midlen, b_midlen;
1165 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1166 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1167
1168 if (qlen_a || qlen_b) {
1169 quote_c_style(a, &name, NULL, 0);
1170 strbuf_addstr(&name, " => ");
1171 quote_c_style(b, &name, NULL, 0);
1172 return strbuf_detach(&name, NULL);
1173 }
1174
1175 /* Find common prefix */
1176 pfx_length = 0;
1177 while (*old && *new && *old == *new) {
1178 if (*old == '/')
1179 pfx_length = old - a + 1;
1180 old++;
1181 new++;
1182 }
1183
1184 /* Find common suffix */
1185 old = a + len_a;
1186 new = b + len_b;
1187 sfx_length = 0;
1188 while (a <= old && b <= new && *old == *new) {
1189 if (*old == '/')
1190 sfx_length = len_a - (old - a);
1191 old--;
1192 new--;
1193 }
1194
1195 /*
1196 * pfx{mid-a => mid-b}sfx
1197 * {pfx-a => pfx-b}sfx
1198 * pfx{sfx-a => sfx-b}
1199 * name-a => name-b
1200 */
1201 a_midlen = len_a - pfx_length - sfx_length;
1202 b_midlen = len_b - pfx_length - sfx_length;
1203 if (a_midlen < 0)
1204 a_midlen = 0;
1205 if (b_midlen < 0)
1206 b_midlen = 0;
1207
1208 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1209 if (pfx_length + sfx_length) {
1210 strbuf_add(&name, a, pfx_length);
1211 strbuf_addch(&name, '{');
1212 }
1213 strbuf_add(&name, a + pfx_length, a_midlen);
1214 strbuf_addstr(&name, " => ");
1215 strbuf_add(&name, b + pfx_length, b_midlen);
1216 if (pfx_length + sfx_length) {
1217 strbuf_addch(&name, '}');
1218 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1219 }
1220 return strbuf_detach(&name, NULL);
1221 }
1222
1223 struct diffstat_t {
1224 int nr;
1225 int alloc;
1226 struct diffstat_file {
1227 char *from_name;
1228 char *name;
1229 char *print_name;
1230 unsigned is_unmerged:1;
1231 unsigned is_binary:1;
1232 unsigned is_renamed:1;
1233 uintmax_t added, deleted;
1234 } **files;
1235 };
1236
1237 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1238 const char *name_a,
1239 const char *name_b)
1240 {
1241 struct diffstat_file *x;
1242 x = xcalloc(sizeof (*x), 1);
1243 if (diffstat->nr == diffstat->alloc) {
1244 diffstat->alloc = alloc_nr(diffstat->alloc);
1245 diffstat->files = xrealloc(diffstat->files,
1246 diffstat->alloc * sizeof(x));
1247 }
1248 diffstat->files[diffstat->nr++] = x;
1249 if (name_b) {
1250 x->from_name = xstrdup(name_a);
1251 x->name = xstrdup(name_b);
1252 x->is_renamed = 1;
1253 }
1254 else {
1255 x->from_name = NULL;
1256 x->name = xstrdup(name_a);
1257 }
1258 return x;
1259 }
1260
1261 static void diffstat_consume(void *priv, char *line, unsigned long len)
1262 {
1263 struct diffstat_t *diffstat = priv;
1264 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1265
1266 if (line[0] == '+')
1267 x->added++;
1268 else if (line[0] == '-')
1269 x->deleted++;
1270 }
1271
1272 const char mime_boundary_leader[] = "------------";
1273
1274 static int scale_linear(int it, int width, int max_change)
1275 {
1276 /*
1277 * make sure that at least one '-' is printed if there were deletions,
1278 * and likewise for '+'.
1279 */
1280 if (max_change < 2)
1281 return it;
1282 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1283 }
1284
1285 static void show_name(FILE *file,
1286 const char *prefix, const char *name, int len)
1287 {
1288 fprintf(file, " %s%-*s |", prefix, len, name);
1289 }
1290
1291 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1292 {
1293 if (cnt <= 0)
1294 return;
1295 fprintf(file, "%s", set);
1296 while (cnt--)
1297 putc(ch, file);
1298 fprintf(file, "%s", reset);
1299 }
1300
1301 static void fill_print_name(struct diffstat_file *file)
1302 {
1303 char *pname;
1304
1305 if (file->print_name)
1306 return;
1307
1308 if (!file->is_renamed) {
1309 struct strbuf buf = STRBUF_INIT;
1310 if (quote_c_style(file->name, &buf, NULL, 0)) {
1311 pname = strbuf_detach(&buf, NULL);
1312 } else {
1313 pname = file->name;
1314 strbuf_release(&buf);
1315 }
1316 } else {
1317 pname = pprint_rename(file->from_name, file->name);
1318 }
1319 file->print_name = pname;
1320 }
1321
1322 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1323 {
1324 struct strbuf sb = STRBUF_INIT;
1325 int ret;
1326
1327 if (!files) {
1328 assert(insertions == 0 && deletions == 0);
1329 return fputs(_(" 0 files changed\n"), fp);
1330 }
1331
1332 strbuf_addf(&sb,
1333 Q_(" %d file changed", " %d files changed", files),
1334 files);
1335
1336 /*
1337 * For binary diff, the caller may want to print "x files
1338 * changed" with insertions == 0 && deletions == 0.
1339 *
1340 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1341 * is probably less confusing (i.e skip over "2 files changed
1342 * but nothing about added/removed lines? Is this a bug in Git?").
1343 */
1344 if (insertions || deletions == 0) {
1345 /*
1346 * TRANSLATORS: "+" in (+) is a line addition marker;
1347 * do not translate it.
1348 */
1349 strbuf_addf(&sb,
1350 Q_(", %d insertion(+)", ", %d insertions(+)",
1351 insertions),
1352 insertions);
1353 }
1354
1355 if (deletions || insertions == 0) {
1356 /*
1357 * TRANSLATORS: "-" in (-) is a line removal marker;
1358 * do not translate it.
1359 */
1360 strbuf_addf(&sb,
1361 Q_(", %d deletion(-)", ", %d deletions(-)",
1362 deletions),
1363 deletions);
1364 }
1365 strbuf_addch(&sb, '\n');
1366 ret = fputs(sb.buf, fp);
1367 strbuf_release(&sb);
1368 return ret;
1369 }
1370
1371 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1372 {
1373 int i, len, add, del, adds = 0, dels = 0;
1374 uintmax_t max_change = 0, max_len = 0;
1375 int total_files = data->nr;
1376 int width, name_width, count;
1377 const char *reset, *add_c, *del_c;
1378 const char *line_prefix = "";
1379 int extra_shown = 0;
1380 struct strbuf *msg = NULL;
1381
1382 if (data->nr == 0)
1383 return;
1384
1385 if (options->output_prefix) {
1386 msg = options->output_prefix(options, options->output_prefix_data);
1387 line_prefix = msg->buf;
1388 }
1389
1390 width = options->stat_width ? options->stat_width : 80;
1391 name_width = options->stat_name_width ? options->stat_name_width : 50;
1392 count = options->stat_count ? options->stat_count : data->nr;
1393
1394 /* Sanity: give at least 5 columns to the graph,
1395 * but leave at least 10 columns for the name.
1396 */
1397 if (width < 25)
1398 width = 25;
1399 if (name_width < 10)
1400 name_width = 10;
1401 else if (width < name_width + 15)
1402 name_width = width - 15;
1403
1404 /* Find the longest filename and max number of changes */
1405 reset = diff_get_color_opt(options, DIFF_RESET);
1406 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1407 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1408
1409 for (i = 0; (i < count) && (i < data->nr); i++) {
1410 struct diffstat_file *file = data->files[i];
1411 uintmax_t change = file->added + file->deleted;
1412 if (!data->files[i]->is_renamed &&
1413 (change == 0)) {
1414 count++; /* not shown == room for one more */
1415 continue;
1416 }
1417 fill_print_name(file);
1418 len = strlen(file->print_name);
1419 if (max_len < len)
1420 max_len = len;
1421
1422 if (file->is_binary || file->is_unmerged)
1423 continue;
1424 if (max_change < change)
1425 max_change = change;
1426 }
1427 count = i; /* min(count, data->nr) */
1428
1429 /* Compute the width of the graph part;
1430 * 10 is for one blank at the beginning of the line plus
1431 * " | count " between the name and the graph.
1432 *
1433 * From here on, name_width is the width of the name area,
1434 * and width is the width of the graph area.
1435 */
1436 name_width = (name_width < max_len) ? name_width : max_len;
1437 if (width < (name_width + 10) + max_change)
1438 width = width - (name_width + 10);
1439 else
1440 width = max_change;
1441
1442 for (i = 0; i < count; i++) {
1443 const char *prefix = "";
1444 char *name = data->files[i]->print_name;
1445 uintmax_t added = data->files[i]->added;
1446 uintmax_t deleted = data->files[i]->deleted;
1447 int name_len;
1448
1449 if (!data->files[i]->is_renamed &&
1450 (added + deleted == 0)) {
1451 total_files--;
1452 continue;
1453 }
1454 /*
1455 * "scale" the filename
1456 */
1457 len = name_width;
1458 name_len = strlen(name);
1459 if (name_width < name_len) {
1460 char *slash;
1461 prefix = "...";
1462 len -= 3;
1463 name += name_len - len;
1464 slash = strchr(name, '/');
1465 if (slash)
1466 name = slash;
1467 }
1468
1469 if (data->files[i]->is_binary) {
1470 fprintf(options->file, "%s", line_prefix);
1471 show_name(options->file, prefix, name, len);
1472 fprintf(options->file, " Bin ");
1473 fprintf(options->file, "%s%"PRIuMAX"%s",
1474 del_c, deleted, reset);
1475 fprintf(options->file, " -> ");
1476 fprintf(options->file, "%s%"PRIuMAX"%s",
1477 add_c, added, reset);
1478 fprintf(options->file, " bytes");
1479 fprintf(options->file, "\n");
1480 continue;
1481 }
1482 else if (data->files[i]->is_unmerged) {
1483 fprintf(options->file, "%s", line_prefix);
1484 show_name(options->file, prefix, name, len);
1485 fprintf(options->file, " Unmerged\n");
1486 continue;
1487 }
1488
1489 /*
1490 * scale the add/delete
1491 */
1492 add = added;
1493 del = deleted;
1494 adds += add;
1495 dels += del;
1496
1497 if (width <= max_change) {
1498 add = scale_linear(add, width, max_change);
1499 del = scale_linear(del, width, max_change);
1500 }
1501 fprintf(options->file, "%s", line_prefix);
1502 show_name(options->file, prefix, name, len);
1503 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1504 added + deleted ? " " : "");
1505 show_graph(options->file, '+', add, add_c, reset);
1506 show_graph(options->file, '-', del, del_c, reset);
1507 fprintf(options->file, "\n");
1508 }
1509 for (i = count; i < data->nr; i++) {
1510 uintmax_t added = data->files[i]->added;
1511 uintmax_t deleted = data->files[i]->deleted;
1512 if (!data->files[i]->is_renamed &&
1513 (added + deleted == 0)) {
1514 total_files--;
1515 continue;
1516 }
1517 adds += added;
1518 dels += deleted;
1519 if (!extra_shown)
1520 fprintf(options->file, "%s ...\n", line_prefix);
1521 extra_shown = 1;
1522 }
1523 fprintf(options->file, "%s", line_prefix);
1524 print_stat_summary(options->file, total_files, adds, dels);
1525 }
1526
1527 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1528 {
1529 int i, adds = 0, dels = 0, total_files = data->nr;
1530
1531 if (data->nr == 0)
1532 return;
1533
1534 for (i = 0; i < data->nr; i++) {
1535 if (!data->files[i]->is_binary &&
1536 !data->files[i]->is_unmerged) {
1537 int added = data->files[i]->added;
1538 int deleted= data->files[i]->deleted;
1539 if (!data->files[i]->is_renamed &&
1540 (added + deleted == 0)) {
1541 total_files--;
1542 } else {
1543 adds += added;
1544 dels += deleted;
1545 }
1546 }
1547 }
1548 if (options->output_prefix) {
1549 struct strbuf *msg = NULL;
1550 msg = options->output_prefix(options,
1551 options->output_prefix_data);
1552 fprintf(options->file, "%s", msg->buf);
1553 }
1554 print_stat_summary(options->file, total_files, adds, dels);
1555 }
1556
1557 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1558 {
1559 int i;
1560
1561 if (data->nr == 0)
1562 return;
1563
1564 for (i = 0; i < data->nr; i++) {
1565 struct diffstat_file *file = data->files[i];
1566
1567 if (options->output_prefix) {
1568 struct strbuf *msg = NULL;
1569 msg = options->output_prefix(options,
1570 options->output_prefix_data);
1571 fprintf(options->file, "%s", msg->buf);
1572 }
1573
1574 if (file->is_binary)
1575 fprintf(options->file, "-\t-\t");
1576 else
1577 fprintf(options->file,
1578 "%"PRIuMAX"\t%"PRIuMAX"\t",
1579 file->added, file->deleted);
1580 if (options->line_termination) {
1581 fill_print_name(file);
1582 if (!file->is_renamed)
1583 write_name_quoted(file->name, options->file,
1584 options->line_termination);
1585 else {
1586 fputs(file->print_name, options->file);
1587 putc(options->line_termination, options->file);
1588 }
1589 } else {
1590 if (file->is_renamed) {
1591 putc('\0', options->file);
1592 write_name_quoted(file->from_name, options->file, '\0');
1593 }
1594 write_name_quoted(file->name, options->file, '\0');
1595 }
1596 }
1597 }
1598
1599 struct dirstat_file {
1600 const char *name;
1601 unsigned long changed;
1602 };
1603
1604 struct dirstat_dir {
1605 struct dirstat_file *files;
1606 int alloc, nr, permille, cumulative;
1607 };
1608
1609 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1610 unsigned long changed, const char *base, int baselen)
1611 {
1612 unsigned long this_dir = 0;
1613 unsigned int sources = 0;
1614 const char *line_prefix = "";
1615 struct strbuf *msg = NULL;
1616
1617 if (opt->output_prefix) {
1618 msg = opt->output_prefix(opt, opt->output_prefix_data);
1619 line_prefix = msg->buf;
1620 }
1621
1622 while (dir->nr) {
1623 struct dirstat_file *f = dir->files;
1624 int namelen = strlen(f->name);
1625 unsigned long this;
1626 char *slash;
1627
1628 if (namelen < baselen)
1629 break;
1630 if (memcmp(f->name, base, baselen))
1631 break;
1632 slash = strchr(f->name + baselen, '/');
1633 if (slash) {
1634 int newbaselen = slash + 1 - f->name;
1635 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1636 sources++;
1637 } else {
1638 this = f->changed;
1639 dir->files++;
1640 dir->nr--;
1641 sources += 2;
1642 }
1643 this_dir += this;
1644 }
1645
1646 /*
1647 * We don't report dirstat's for
1648 * - the top level
1649 * - or cases where everything came from a single directory
1650 * under this directory (sources == 1).
1651 */
1652 if (baselen && sources != 1) {
1653 if (this_dir) {
1654 int permille = this_dir * 1000 / changed;
1655 if (permille >= dir->permille) {
1656 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1657 permille / 10, permille % 10, baselen, base);
1658 if (!dir->cumulative)
1659 return 0;
1660 }
1661 }
1662 }
1663 return this_dir;
1664 }
1665
1666 static int dirstat_compare(const void *_a, const void *_b)
1667 {
1668 const struct dirstat_file *a = _a;
1669 const struct dirstat_file *b = _b;
1670 return strcmp(a->name, b->name);
1671 }
1672
1673 static void show_dirstat(struct diff_options *options)
1674 {
1675 int i;
1676 unsigned long changed;
1677 struct dirstat_dir dir;
1678 struct diff_queue_struct *q = &diff_queued_diff;
1679
1680 dir.files = NULL;
1681 dir.alloc = 0;
1682 dir.nr = 0;
1683 dir.permille = options->dirstat_permille;
1684 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1685
1686 changed = 0;
1687 for (i = 0; i < q->nr; i++) {
1688 struct diff_filepair *p = q->queue[i];
1689 const char *name;
1690 unsigned long copied, added, damage;
1691 int content_changed;
1692
1693 name = p->two->path ? p->two->path : p->one->path;
1694
1695 if (p->one->sha1_valid && p->two->sha1_valid)
1696 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1697 else
1698 content_changed = 1;
1699
1700 if (!content_changed) {
1701 /*
1702 * The SHA1 has not changed, so pre-/post-content is
1703 * identical. We can therefore skip looking at the
1704 * file contents altogether.
1705 */
1706 damage = 0;
1707 goto found_damage;
1708 }
1709
1710 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1711 /*
1712 * In --dirstat-by-file mode, we don't really need to
1713 * look at the actual file contents at all.
1714 * The fact that the SHA1 changed is enough for us to
1715 * add this file to the list of results
1716 * (with each file contributing equal damage).
1717 */
1718 damage = 1;
1719 goto found_damage;
1720 }
1721
1722 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1723 diff_populate_filespec(p->one, 0);
1724 diff_populate_filespec(p->two, 0);
1725 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1726 &copied, &added);
1727 diff_free_filespec_data(p->one);
1728 diff_free_filespec_data(p->two);
1729 } else if (DIFF_FILE_VALID(p->one)) {
1730 diff_populate_filespec(p->one, 1);
1731 copied = added = 0;
1732 diff_free_filespec_data(p->one);
1733 } else if (DIFF_FILE_VALID(p->two)) {
1734 diff_populate_filespec(p->two, 1);
1735 copied = 0;
1736 added = p->two->size;
1737 diff_free_filespec_data(p->two);
1738 } else
1739 continue;
1740
1741 /*
1742 * Original minus copied is the removed material,
1743 * added is the new material. They are both damages
1744 * made to the preimage.
1745 * If the resulting damage is zero, we know that
1746 * diffcore_count_changes() considers the two entries to
1747 * be identical, but since content_changed is true, we
1748 * know that there must have been _some_ kind of change,
1749 * so we force all entries to have damage > 0.
1750 */
1751 damage = (p->one->size - copied) + added;
1752 if (!damage)
1753 damage = 1;
1754
1755 found_damage:
1756 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1757 dir.files[dir.nr].name = name;
1758 dir.files[dir.nr].changed = damage;
1759 changed += damage;
1760 dir.nr++;
1761 }
1762
1763 /* This can happen even with many files, if everything was renames */
1764 if (!changed)
1765 return;
1766
1767 /* Show all directories with more than x% of the changes */
1768 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1769 gather_dirstat(options, &dir, changed, "", 0);
1770 }
1771
1772 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1773 {
1774 int i;
1775 unsigned long changed;
1776 struct dirstat_dir dir;
1777
1778 if (data->nr == 0)
1779 return;
1780
1781 dir.files = NULL;
1782 dir.alloc = 0;
1783 dir.nr = 0;
1784 dir.permille = options->dirstat_permille;
1785 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1786
1787 changed = 0;
1788 for (i = 0; i < data->nr; i++) {
1789 struct diffstat_file *file = data->files[i];
1790 unsigned long damage = file->added + file->deleted;
1791 if (file->is_binary)
1792 /*
1793 * binary files counts bytes, not lines. Must find some
1794 * way to normalize binary bytes vs. textual lines.
1795 * The following heuristic assumes that there are 64
1796 * bytes per "line".
1797 * This is stupid and ugly, but very cheap...
1798 */
1799 damage = (damage + 63) / 64;
1800 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1801 dir.files[dir.nr].name = file->name;
1802 dir.files[dir.nr].changed = damage;
1803 changed += damage;
1804 dir.nr++;
1805 }
1806
1807 /* This can happen even with many files, if everything was renames */
1808 if (!changed)
1809 return;
1810
1811 /* Show all directories with more than x% of the changes */
1812 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1813 gather_dirstat(options, &dir, changed, "", 0);
1814 }
1815
1816 static void free_diffstat_info(struct diffstat_t *diffstat)
1817 {
1818 int i;
1819 for (i = 0; i < diffstat->nr; i++) {
1820 struct diffstat_file *f = diffstat->files[i];
1821 if (f->name != f->print_name)
1822 free(f->print_name);
1823 free(f->name);
1824 free(f->from_name);
1825 free(f);
1826 }
1827 free(diffstat->files);
1828 }
1829
1830 struct checkdiff_t {
1831 const char *filename;
1832 int lineno;
1833 int conflict_marker_size;
1834 struct diff_options *o;
1835 unsigned ws_rule;
1836 unsigned status;
1837 };
1838
1839 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1840 {
1841 char firstchar;
1842 int cnt;
1843
1844 if (len < marker_size + 1)
1845 return 0;
1846 firstchar = line[0];
1847 switch (firstchar) {
1848 case '=': case '>': case '<': case '|':
1849 break;
1850 default:
1851 return 0;
1852 }
1853 for (cnt = 1; cnt < marker_size; cnt++)
1854 if (line[cnt] != firstchar)
1855 return 0;
1856 /* line[1] thru line[marker_size-1] are same as firstchar */
1857 if (len < marker_size + 1 || !isspace(line[marker_size]))
1858 return 0;
1859 return 1;
1860 }
1861
1862 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1863 {
1864 struct checkdiff_t *data = priv;
1865 int marker_size = data->conflict_marker_size;
1866 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1867 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1868 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1869 char *err;
1870 char *line_prefix = "";
1871 struct strbuf *msgbuf;
1872
1873 assert(data->o);
1874 if (data->o->output_prefix) {
1875 msgbuf = data->o->output_prefix(data->o,
1876 data->o->output_prefix_data);
1877 line_prefix = msgbuf->buf;
1878 }
1879
1880 if (line[0] == '+') {
1881 unsigned bad;
1882 data->lineno++;
1883 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1884 data->status |= 1;
1885 fprintf(data->o->file,
1886 "%s%s:%d: leftover conflict marker\n",
1887 line_prefix, data->filename, data->lineno);
1888 }
1889 bad = ws_check(line + 1, len - 1, data->ws_rule);
1890 if (!bad)
1891 return;
1892 data->status |= bad;
1893 err = whitespace_error_string(bad);
1894 fprintf(data->o->file, "%s%s:%d: %s.\n",
1895 line_prefix, data->filename, data->lineno, err);
1896 free(err);
1897 emit_line(data->o, set, reset, line, 1);
1898 ws_check_emit(line + 1, len - 1, data->ws_rule,
1899 data->o->file, set, reset, ws);
1900 } else if (line[0] == ' ') {
1901 data->lineno++;
1902 } else if (line[0] == '@') {
1903 char *plus = strchr(line, '+');
1904 if (plus)
1905 data->lineno = strtol(plus, NULL, 10) - 1;
1906 else
1907 die("invalid diff");
1908 }
1909 }
1910
1911 static unsigned char *deflate_it(char *data,
1912 unsigned long size,
1913 unsigned long *result_size)
1914 {
1915 int bound;
1916 unsigned char *deflated;
1917 git_zstream stream;
1918
1919 memset(&stream, 0, sizeof(stream));
1920 git_deflate_init(&stream, zlib_compression_level);
1921 bound = git_deflate_bound(&stream, size);
1922 deflated = xmalloc(bound);
1923 stream.next_out = deflated;
1924 stream.avail_out = bound;
1925
1926 stream.next_in = (unsigned char *)data;
1927 stream.avail_in = size;
1928 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1929 ; /* nothing */
1930 git_deflate_end(&stream);
1931 *result_size = stream.total_out;
1932 return deflated;
1933 }
1934
1935 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1936 {
1937 void *cp;
1938 void *delta;
1939 void *deflated;
1940 void *data;
1941 unsigned long orig_size;
1942 unsigned long delta_size;
1943 unsigned long deflate_size;
1944 unsigned long data_size;
1945
1946 /* We could do deflated delta, or we could do just deflated two,
1947 * whichever is smaller.
1948 */
1949 delta = NULL;
1950 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1951 if (one->size && two->size) {
1952 delta = diff_delta(one->ptr, one->size,
1953 two->ptr, two->size,
1954 &delta_size, deflate_size);
1955 if (delta) {
1956 void *to_free = delta;
1957 orig_size = delta_size;
1958 delta = deflate_it(delta, delta_size, &delta_size);
1959 free(to_free);
1960 }
1961 }
1962
1963 if (delta && delta_size < deflate_size) {
1964 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1965 free(deflated);
1966 data = delta;
1967 data_size = delta_size;
1968 }
1969 else {
1970 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1971 free(delta);
1972 data = deflated;
1973 data_size = deflate_size;
1974 }
1975
1976 /* emit data encoded in base85 */
1977 cp = data;
1978 while (data_size) {
1979 int bytes = (52 < data_size) ? 52 : data_size;
1980 char line[70];
1981 data_size -= bytes;
1982 if (bytes <= 26)
1983 line[0] = bytes + 'A' - 1;
1984 else
1985 line[0] = bytes - 26 + 'a' - 1;
1986 encode_85(line + 1, cp, bytes);
1987 cp = (char *) cp + bytes;
1988 fprintf(file, "%s", prefix);
1989 fputs(line, file);
1990 fputc('\n', file);
1991 }
1992 fprintf(file, "%s\n", prefix);
1993 free(data);
1994 }
1995
1996 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1997 {
1998 fprintf(file, "%sGIT binary patch\n", prefix);
1999 emit_binary_diff_body(file, one, two, prefix);
2000 emit_binary_diff_body(file, two, one, prefix);
2001 }
2002
2003 static void diff_filespec_load_driver(struct diff_filespec *one)
2004 {
2005 /* Use already-loaded driver */
2006 if (one->driver)
2007 return;
2008
2009 if (S_ISREG(one->mode))
2010 one->driver = userdiff_find_by_path(one->path);
2011
2012 /* Fallback to default settings */
2013 if (!one->driver)
2014 one->driver = userdiff_find_by_name("default");
2015 }
2016
2017 int diff_filespec_is_binary(struct diff_filespec *one)
2018 {
2019 if (one->is_binary == -1) {
2020 diff_filespec_load_driver(one);
2021 if (one->driver->binary != -1)
2022 one->is_binary = one->driver->binary;
2023 else {
2024 if (!one->data && DIFF_FILE_VALID(one))
2025 diff_populate_filespec(one, 0);
2026 if (one->data)
2027 one->is_binary = buffer_is_binary(one->data,
2028 one->size);
2029 if (one->is_binary == -1)
2030 one->is_binary = 0;
2031 }
2032 }
2033 return one->is_binary;
2034 }
2035
2036 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2037 {
2038 diff_filespec_load_driver(one);
2039 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2040 }
2041
2042 static const char *userdiff_word_regex(struct diff_filespec *one)
2043 {
2044 diff_filespec_load_driver(one);
2045 return one->driver->word_regex;
2046 }
2047
2048 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2049 {
2050 if (!options->a_prefix)
2051 options->a_prefix = a;
2052 if (!options->b_prefix)
2053 options->b_prefix = b;
2054 }
2055
2056 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2057 {
2058 if (!DIFF_FILE_VALID(one))
2059 return NULL;
2060
2061 diff_filespec_load_driver(one);
2062 return userdiff_get_textconv(one->driver);
2063 }
2064
2065 static void builtin_diff(const char *name_a,
2066 const char *name_b,
2067 struct diff_filespec *one,
2068 struct diff_filespec *two,
2069 const char *xfrm_msg,
2070 int must_show_header,
2071 struct diff_options *o,
2072 int complete_rewrite)
2073 {
2074 mmfile_t mf1, mf2;
2075 const char *lbl[2];
2076 char *a_one, *b_two;
2077 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2078 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2079 const char *a_prefix, *b_prefix;
2080 struct userdiff_driver *textconv_one = NULL;
2081 struct userdiff_driver *textconv_two = NULL;
2082 struct strbuf header = STRBUF_INIT;
2083 struct strbuf *msgbuf;
2084 char *line_prefix = "";
2085
2086 if (o->output_prefix) {
2087 msgbuf = o->output_prefix(o, o->output_prefix_data);
2088 line_prefix = msgbuf->buf;
2089 }
2090
2091 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2092 (!one->mode || S_ISGITLINK(one->mode)) &&
2093 (!two->mode || S_ISGITLINK(two->mode))) {
2094 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2095 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2096 show_submodule_summary(o->file, one ? one->path : two->path,
2097 one->sha1, two->sha1, two->dirty_submodule,
2098 del, add, reset);
2099 return;
2100 }
2101
2102 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2103 textconv_one = get_textconv(one);
2104 textconv_two = get_textconv(two);
2105 }
2106
2107 diff_set_mnemonic_prefix(o, "a/", "b/");
2108 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2109 a_prefix = o->b_prefix;
2110 b_prefix = o->a_prefix;
2111 } else {
2112 a_prefix = o->a_prefix;
2113 b_prefix = o->b_prefix;
2114 }
2115
2116 /* Never use a non-valid filename anywhere if at all possible */
2117 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2118 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2119
2120 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2121 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2122 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2123 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2124 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2125 if (lbl[0][0] == '/') {
2126 /* /dev/null */
2127 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2128 if (xfrm_msg)
2129 strbuf_addstr(&header, xfrm_msg);
2130 must_show_header = 1;
2131 }
2132 else if (lbl[1][0] == '/') {
2133 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2134 if (xfrm_msg)
2135 strbuf_addstr(&header, xfrm_msg);
2136 must_show_header = 1;
2137 }
2138 else {
2139 if (one->mode != two->mode) {
2140 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2141 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2142 must_show_header = 1;
2143 }
2144 if (xfrm_msg)
2145 strbuf_addstr(&header, xfrm_msg);
2146
2147 /*
2148 * we do not run diff between different kind
2149 * of objects.
2150 */
2151 if ((one->mode ^ two->mode) & S_IFMT)
2152 goto free_ab_and_return;
2153 if (complete_rewrite &&
2154 (textconv_one || !diff_filespec_is_binary(one)) &&
2155 (textconv_two || !diff_filespec_is_binary(two))) {
2156 fprintf(o->file, "%s", header.buf);
2157 strbuf_reset(&header);
2158 emit_rewrite_diff(name_a, name_b, one, two,
2159 textconv_one, textconv_two, o);
2160 o->found_changes = 1;
2161 goto free_ab_and_return;
2162 }
2163 }
2164
2165 if (o->irreversible_delete && lbl[1][0] == '/') {
2166 fprintf(o->file, "%s", header.buf);
2167 strbuf_reset(&header);
2168 goto free_ab_and_return;
2169 } else if (!DIFF_OPT_TST(o, TEXT) &&
2170 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2171 (!textconv_two && diff_filespec_is_binary(two)) )) {
2172 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2173 die("unable to read files to diff");
2174 /* Quite common confusing case */
2175 if (mf1.size == mf2.size &&
2176 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2177 if (must_show_header)
2178 fprintf(o->file, "%s", header.buf);
2179 goto free_ab_and_return;
2180 }
2181 fprintf(o->file, "%s", header.buf);
2182 strbuf_reset(&header);
2183 if (DIFF_OPT_TST(o, BINARY))
2184 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2185 else
2186 fprintf(o->file, "%sBinary files %s and %s differ\n",
2187 line_prefix, lbl[0], lbl[1]);
2188 o->found_changes = 1;
2189 } else {
2190 /* Crazy xdl interfaces.. */
2191 const char *diffopts = getenv("GIT_DIFF_OPTS");
2192 xpparam_t xpp;
2193 xdemitconf_t xecfg;
2194 struct emit_callback ecbdata;
2195 const struct userdiff_funcname *pe;
2196
2197 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2198 fprintf(o->file, "%s", header.buf);
2199 strbuf_reset(&header);
2200 }
2201
2202 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2203 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2204
2205 pe = diff_funcname_pattern(one);
2206 if (!pe)
2207 pe = diff_funcname_pattern(two);
2208
2209 memset(&xpp, 0, sizeof(xpp));
2210 memset(&xecfg, 0, sizeof(xecfg));
2211 memset(&ecbdata, 0, sizeof(ecbdata));
2212 ecbdata.label_path = lbl;
2213 ecbdata.color_diff = want_color(o->use_color);
2214 ecbdata.found_changesp = &o->found_changes;
2215 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2216 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2217 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2218 ecbdata.opt = o;
2219 ecbdata.header = header.len ? &header : NULL;
2220 xpp.flags = o->xdl_opts;
2221 xecfg.ctxlen = o->context;
2222 xecfg.interhunkctxlen = o->interhunkcontext;
2223 xecfg.flags = XDL_EMIT_FUNCNAMES;
2224 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2225 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2226 if (pe)
2227 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2228 if (!diffopts)
2229 ;
2230 else if (!prefixcmp(diffopts, "--unified="))
2231 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2232 else if (!prefixcmp(diffopts, "-u"))
2233 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2234 if (o->word_diff) {
2235 int i;
2236
2237 ecbdata.diff_words =
2238 xcalloc(1, sizeof(struct diff_words_data));
2239 ecbdata.diff_words->type = o->word_diff;
2240 ecbdata.diff_words->opt = o;
2241 if (!o->word_regex)
2242 o->word_regex = userdiff_word_regex(one);
2243 if (!o->word_regex)
2244 o->word_regex = userdiff_word_regex(two);
2245 if (!o->word_regex)
2246 o->word_regex = diff_word_regex_cfg;
2247 if (o->word_regex) {
2248 ecbdata.diff_words->word_regex = (regex_t *)
2249 xmalloc(sizeof(regex_t));
2250 if (regcomp(ecbdata.diff_words->word_regex,
2251 o->word_regex,
2252 REG_EXTENDED | REG_NEWLINE))
2253 die ("Invalid regular expression: %s",
2254 o->word_regex);
2255 }
2256 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2257 if (o->word_diff == diff_words_styles[i].type) {
2258 ecbdata.diff_words->style =
2259 &diff_words_styles[i];
2260 break;
2261 }
2262 }
2263 if (want_color(o->use_color)) {
2264 struct diff_words_style *st = ecbdata.diff_words->style;
2265 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2266 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2267 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2268 }
2269 }
2270 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2271 &xpp, &xecfg);
2272 if (o->word_diff)
2273 free_diff_words_data(&ecbdata);
2274 if (textconv_one)
2275 free(mf1.ptr);
2276 if (textconv_two)
2277 free(mf2.ptr);
2278 xdiff_clear_find_func(&xecfg);
2279 }
2280
2281 free_ab_and_return:
2282 strbuf_release(&header);
2283 diff_free_filespec_data(one);
2284 diff_free_filespec_data(two);
2285 free(a_one);
2286 free(b_two);
2287 return;
2288 }
2289
2290 static void builtin_diffstat(const char *name_a, const char *name_b,
2291 struct diff_filespec *one,
2292 struct diff_filespec *two,
2293 struct diffstat_t *diffstat,
2294 struct diff_options *o,
2295 int complete_rewrite)
2296 {
2297 mmfile_t mf1, mf2;
2298 struct diffstat_file *data;
2299
2300 data = diffstat_add(diffstat, name_a, name_b);
2301
2302 if (!one || !two) {
2303 data->is_unmerged = 1;
2304 return;
2305 }
2306
2307 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2308 data->is_binary = 1;
2309 data->added = diff_filespec_size(two);
2310 data->deleted = diff_filespec_size(one);
2311 }
2312
2313 else if (complete_rewrite) {
2314 diff_populate_filespec(one, 0);
2315 diff_populate_filespec(two, 0);
2316 data->deleted = count_lines(one->data, one->size);
2317 data->added = count_lines(two->data, two->size);
2318 }
2319
2320 else {
2321 /* Crazy xdl interfaces.. */
2322 xpparam_t xpp;
2323 xdemitconf_t xecfg;
2324
2325 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2326 die("unable to read files to diff");
2327
2328 memset(&xpp, 0, sizeof(xpp));
2329 memset(&xecfg, 0, sizeof(xecfg));
2330 xpp.flags = o->xdl_opts;
2331 xecfg.ctxlen = o->context;
2332 xecfg.interhunkctxlen = o->interhunkcontext;
2333 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2334 &xpp, &xecfg);
2335 }
2336
2337 diff_free_filespec_data(one);
2338 diff_free_filespec_data(two);
2339 }
2340
2341 static void builtin_checkdiff(const char *name_a, const char *name_b,
2342 const char *attr_path,
2343 struct diff_filespec *one,
2344 struct diff_filespec *two,
2345 struct diff_options *o)
2346 {
2347 mmfile_t mf1, mf2;
2348 struct checkdiff_t data;
2349
2350 if (!two)
2351 return;
2352
2353 memset(&data, 0, sizeof(data));
2354 data.filename = name_b ? name_b : name_a;
2355 data.lineno = 0;
2356 data.o = o;
2357 data.ws_rule = whitespace_rule(attr_path);
2358 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2359
2360 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2361 die("unable to read files to diff");
2362
2363 /*
2364 * All the other codepaths check both sides, but not checking
2365 * the "old" side here is deliberate. We are checking the newly
2366 * introduced changes, and as long as the "new" side is text, we
2367 * can and should check what it introduces.
2368 */
2369 if (diff_filespec_is_binary(two))
2370 goto free_and_return;
2371 else {
2372 /* Crazy xdl interfaces.. */
2373 xpparam_t xpp;
2374 xdemitconf_t xecfg;
2375
2376 memset(&xpp, 0, sizeof(xpp));
2377 memset(&xecfg, 0, sizeof(xecfg));
2378 xecfg.ctxlen = 1; /* at least one context line */
2379 xpp.flags = 0;
2380 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2381 &xpp, &xecfg);
2382
2383 if (data.ws_rule & WS_BLANK_AT_EOF) {
2384 struct emit_callback ecbdata;
2385 int blank_at_eof;
2386
2387 ecbdata.ws_rule = data.ws_rule;
2388 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2389 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2390
2391 if (blank_at_eof) {
2392 static char *err;
2393 if (!err)
2394 err = whitespace_error_string(WS_BLANK_AT_EOF);
2395 fprintf(o->file, "%s:%d: %s.\n",
2396 data.filename, blank_at_eof, err);
2397 data.status = 1; /* report errors */
2398 }
2399 }
2400 }
2401 free_and_return:
2402 diff_free_filespec_data(one);
2403 diff_free_filespec_data(two);
2404 if (data.status)
2405 DIFF_OPT_SET(o, CHECK_FAILED);
2406 }
2407
2408 struct diff_filespec *alloc_filespec(const char *path)
2409 {
2410 int namelen = strlen(path);
2411 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2412
2413 memset(spec, 0, sizeof(*spec));
2414 spec->path = (char *)(spec + 1);
2415 memcpy(spec->path, path, namelen+1);
2416 spec->count = 1;
2417 spec->is_binary = -1;
2418 return spec;
2419 }
2420
2421 void free_filespec(struct diff_filespec *spec)
2422 {
2423 if (!--spec->count) {
2424 diff_free_filespec_data(spec);
2425 free(spec);
2426 }
2427 }
2428
2429 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2430 unsigned short mode)
2431 {
2432 if (mode) {
2433 spec->mode = canon_mode(mode);
2434 hashcpy(spec->sha1, sha1);
2435 spec->sha1_valid = !is_null_sha1(sha1);
2436 }
2437 }
2438
2439 /*
2440 * Given a name and sha1 pair, if the index tells us the file in
2441 * the work tree has that object contents, return true, so that
2442 * prepare_temp_file() does not have to inflate and extract.
2443 */
2444 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2445 {
2446 struct cache_entry *ce;
2447 struct stat st;
2448 int pos, len;
2449
2450 /*
2451 * We do not read the cache ourselves here, because the
2452 * benchmark with my previous version that always reads cache
2453 * shows that it makes things worse for diff-tree comparing
2454 * two linux-2.6 kernel trees in an already checked out work
2455 * tree. This is because most diff-tree comparisons deal with
2456 * only a small number of files, while reading the cache is
2457 * expensive for a large project, and its cost outweighs the
2458 * savings we get by not inflating the object to a temporary
2459 * file. Practically, this code only helps when we are used
2460 * by diff-cache --cached, which does read the cache before
2461 * calling us.
2462 */
2463 if (!active_cache)
2464 return 0;
2465
2466 /* We want to avoid the working directory if our caller
2467 * doesn't need the data in a normal file, this system
2468 * is rather slow with its stat/open/mmap/close syscalls,
2469 * and the object is contained in a pack file. The pack
2470 * is probably already open and will be faster to obtain
2471 * the data through than the working directory. Loose
2472 * objects however would tend to be slower as they need
2473 * to be individually opened and inflated.
2474 */
2475 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2476 return 0;
2477
2478 len = strlen(name);
2479 pos = cache_name_pos(name, len);
2480 if (pos < 0)
2481 return 0;
2482 ce = active_cache[pos];
2483
2484 /*
2485 * This is not the sha1 we are looking for, or
2486 * unreusable because it is not a regular file.
2487 */
2488 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2489 return 0;
2490
2491 /*
2492 * If ce is marked as "assume unchanged", there is no
2493 * guarantee that work tree matches what we are looking for.
2494 */
2495 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2496 return 0;
2497
2498 /*
2499 * If ce matches the file in the work tree, we can reuse it.
2500 */
2501 if (ce_uptodate(ce) ||
2502 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2503 return 1;
2504
2505 return 0;
2506 }
2507
2508 static int populate_from_stdin(struct diff_filespec *s)
2509 {
2510 struct strbuf buf = STRBUF_INIT;
2511 size_t size = 0;
2512
2513 if (strbuf_read(&buf, 0, 0) < 0)
2514 return error("error while reading from stdin %s",
2515 strerror(errno));
2516
2517 s->should_munmap = 0;
2518 s->data = strbuf_detach(&buf, &size);
2519 s->size = size;
2520 s->should_free = 1;
2521 return 0;
2522 }
2523
2524 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2525 {
2526 int len;
2527 char *data = xmalloc(100), *dirty = "";
2528
2529 /* Are we looking at the work tree? */
2530 if (s->dirty_submodule)
2531 dirty = "-dirty";
2532
2533 len = snprintf(data, 100,
2534 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2535 s->data = data;
2536 s->size = len;
2537 s->should_free = 1;
2538 if (size_only) {
2539 s->data = NULL;
2540 free(data);
2541 }
2542 return 0;
2543 }
2544
2545 /*
2546 * While doing rename detection and pickaxe operation, we may need to
2547 * grab the data for the blob (or file) for our own in-core comparison.
2548 * diff_filespec has data and size fields for this purpose.
2549 */
2550 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2551 {
2552 int err = 0;
2553 if (!DIFF_FILE_VALID(s))
2554 die("internal error: asking to populate invalid file.");
2555 if (S_ISDIR(s->mode))
2556 return -1;
2557
2558 if (s->data)
2559 return 0;
2560
2561 if (size_only && 0 < s->size)
2562 return 0;
2563
2564 if (S_ISGITLINK(s->mode))
2565 return diff_populate_gitlink(s, size_only);
2566
2567 if (!s->sha1_valid ||
2568 reuse_worktree_file(s->path, s->sha1, 0)) {
2569 struct strbuf buf = STRBUF_INIT;
2570 struct stat st;
2571 int fd;
2572
2573 if (!strcmp(s->path, "-"))
2574 return populate_from_stdin(s);
2575
2576 if (lstat(s->path, &st) < 0) {
2577 if (errno == ENOENT) {
2578 err_empty:
2579 err = -1;
2580 empty:
2581 s->data = (char *)"";
2582 s->size = 0;
2583 return err;
2584 }
2585 }
2586 s->size = xsize_t(st.st_size);
2587 if (!s->size)
2588 goto empty;
2589 if (S_ISLNK(st.st_mode)) {
2590 struct strbuf sb = STRBUF_INIT;
2591
2592 if (strbuf_readlink(&sb, s->path, s->size))
2593 goto err_empty;
2594 s->size = sb.len;
2595 s->data = strbuf_detach(&sb, NULL);
2596 s->should_free = 1;
2597 return 0;
2598 }
2599 if (size_only)
2600 return 0;
2601 fd = open(s->path, O_RDONLY);
2602 if (fd < 0)
2603 goto err_empty;
2604 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2605 close(fd);
2606 s->should_munmap = 1;
2607
2608 /*
2609 * Convert from working tree format to canonical git format
2610 */
2611 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2612 size_t size = 0;
2613 munmap(s->data, s->size);
2614 s->should_munmap = 0;
2615 s->data = strbuf_detach(&buf, &size);
2616 s->size = size;
2617 s->should_free = 1;
2618 }
2619 }
2620 else {
2621 enum object_type type;
2622 if (size_only) {
2623 type = sha1_object_info(s->sha1, &s->size);
2624 if (type < 0)
2625 die("unable to read %s", sha1_to_hex(s->sha1));
2626 } else {
2627 s->data = read_sha1_file(s->sha1, &type, &s->size);
2628 if (!s->data)
2629 die("unable to read %s", sha1_to_hex(s->sha1));
2630 s->should_free = 1;
2631 }
2632 }
2633 return 0;
2634 }
2635
2636 void diff_free_filespec_blob(struct diff_filespec *s)
2637 {
2638 if (s->should_free)
2639 free(s->data);
2640 else if (s->should_munmap)
2641 munmap(s->data, s->size);
2642
2643 if (s->should_free || s->should_munmap) {
2644 s->should_free = s->should_munmap = 0;
2645 s->data = NULL;
2646 }
2647 }
2648
2649 void diff_free_filespec_data(struct diff_filespec *s)
2650 {
2651 diff_free_filespec_blob(s);
2652 free(s->cnt_data);
2653 s->cnt_data = NULL;
2654 }
2655
2656 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2657 void *blob,
2658 unsigned long size,
2659 const unsigned char *sha1,
2660 int mode)
2661 {
2662 int fd;
2663 struct strbuf buf = STRBUF_INIT;
2664 struct strbuf template = STRBUF_INIT;
2665 char *path_dup = xstrdup(path);
2666 const char *base = basename(path_dup);
2667
2668 /* Generate "XXXXXX_basename.ext" */
2669 strbuf_addstr(&template, "XXXXXX_");
2670 strbuf_addstr(&template, base);
2671
2672 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2673 strlen(base) + 1);
2674 if (fd < 0)
2675 die_errno("unable to create temp-file");
2676 if (convert_to_working_tree(path,
2677 (const char *)blob, (size_t)size, &buf)) {
2678 blob = buf.buf;
2679 size = buf.len;
2680 }
2681 if (write_in_full(fd, blob, size) != size)
2682 die_errno("unable to write temp-file");
2683 close(fd);
2684 temp->name = temp->tmp_path;
2685 strcpy(temp->hex, sha1_to_hex(sha1));
2686 temp->hex[40] = 0;
2687 sprintf(temp->mode, "%06o", mode);
2688 strbuf_release(&buf);
2689 strbuf_release(&template);
2690 free(path_dup);
2691 }
2692
2693 static struct diff_tempfile *prepare_temp_file(const char *name,
2694 struct diff_filespec *one)
2695 {
2696 struct diff_tempfile *temp = claim_diff_tempfile();
2697
2698 if (!DIFF_FILE_VALID(one)) {
2699 not_a_valid_file:
2700 /* A '-' entry produces this for file-2, and
2701 * a '+' entry produces this for file-1.
2702 */
2703 temp->name = "/dev/null";
2704 strcpy(temp->hex, ".");
2705 strcpy(temp->mode, ".");
2706 return temp;
2707 }
2708
2709 if (!remove_tempfile_installed) {
2710 atexit(remove_tempfile);
2711 sigchain_push_common(remove_tempfile_on_signal);
2712 remove_tempfile_installed = 1;
2713 }
2714
2715 if (!one->sha1_valid ||
2716 reuse_worktree_file(name, one->sha1, 1)) {
2717 struct stat st;
2718 if (lstat(name, &st) < 0) {
2719 if (errno == ENOENT)
2720 goto not_a_valid_file;
2721 die_errno("stat(%s)", name);
2722 }
2723 if (S_ISLNK(st.st_mode)) {
2724 struct strbuf sb = STRBUF_INIT;
2725 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2726 die_errno("readlink(%s)", name);
2727 prep_temp_blob(name, temp, sb.buf, sb.len,
2728 (one->sha1_valid ?
2729 one->sha1 : null_sha1),
2730 (one->sha1_valid ?
2731 one->mode : S_IFLNK));
2732 strbuf_release(&sb);
2733 }
2734 else {
2735 /* we can borrow from the file in the work tree */
2736 temp->name = name;
2737 if (!one->sha1_valid)
2738 strcpy(temp->hex, sha1_to_hex(null_sha1));
2739 else
2740 strcpy(temp->hex, sha1_to_hex(one->sha1));
2741 /* Even though we may sometimes borrow the
2742 * contents from the work tree, we always want
2743 * one->mode. mode is trustworthy even when
2744 * !(one->sha1_valid), as long as
2745 * DIFF_FILE_VALID(one).
2746 */
2747 sprintf(temp->mode, "%06o", one->mode);
2748 }
2749 return temp;
2750 }
2751 else {
2752 if (diff_populate_filespec(one, 0))
2753 die("cannot read data blob for %s", one->path);
2754 prep_temp_blob(name, temp, one->data, one->size,
2755 one->sha1, one->mode);
2756 }
2757 return temp;
2758 }
2759
2760 /* An external diff command takes:
2761 *
2762 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2763 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2764 *
2765 */
2766 static void run_external_diff(const char *pgm,
2767 const char *name,
2768 const char *other,
2769 struct diff_filespec *one,
2770 struct diff_filespec *two,
2771 const char *xfrm_msg,
2772 int complete_rewrite)
2773 {
2774 const char *spawn_arg[10];
2775 int retval;
2776 const char **arg = &spawn_arg[0];
2777
2778 if (one && two) {
2779 struct diff_tempfile *temp_one, *temp_two;
2780 const char *othername = (other ? other : name);
2781 temp_one = prepare_temp_file(name, one);
2782 temp_two = prepare_temp_file(othername, two);
2783 *arg++ = pgm;
2784 *arg++ = name;
2785 *arg++ = temp_one->name;
2786 *arg++ = temp_one->hex;
2787 *arg++ = temp_one->mode;
2788 *arg++ = temp_two->name;
2789 *arg++ = temp_two->hex;
2790 *arg++ = temp_two->mode;
2791 if (other) {
2792 *arg++ = other;
2793 *arg++ = xfrm_msg;
2794 }
2795 } else {
2796 *arg++ = pgm;
2797 *arg++ = name;
2798 }
2799 *arg = NULL;
2800 fflush(NULL);
2801 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2802 remove_tempfile();
2803 if (retval) {
2804 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2805 exit(1);
2806 }
2807 }
2808
2809 static int similarity_index(struct diff_filepair *p)
2810 {
2811 return p->score * 100 / MAX_SCORE;
2812 }
2813
2814 static void fill_metainfo(struct strbuf *msg,
2815 const char *name,
2816 const char *other,
2817 struct diff_filespec *one,
2818 struct diff_filespec *two,
2819 struct diff_options *o,
2820 struct diff_filepair *p,
2821 int *must_show_header,
2822 int use_color)
2823 {
2824 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2825 const char *reset = diff_get_color(use_color, DIFF_RESET);
2826 struct strbuf *msgbuf;
2827 char *line_prefix = "";
2828
2829 *must_show_header = 1;
2830 if (o->output_prefix) {
2831 msgbuf = o->output_prefix(o, o->output_prefix_data);
2832 line_prefix = msgbuf->buf;
2833 }
2834 strbuf_init(msg, PATH_MAX * 2 + 300);
2835 switch (p->status) {
2836 case DIFF_STATUS_COPIED:
2837 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2838 line_prefix, set, similarity_index(p));
2839 strbuf_addf(msg, "%s\n%s%scopy from ",
2840 reset, line_prefix, set);
2841 quote_c_style(name, msg, NULL, 0);
2842 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2843 quote_c_style(other, msg, NULL, 0);
2844 strbuf_addf(msg, "%s\n", reset);
2845 break;
2846 case DIFF_STATUS_RENAMED:
2847 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2848 line_prefix, set, similarity_index(p));
2849 strbuf_addf(msg, "%s\n%s%srename from ",
2850 reset, line_prefix, set);
2851 quote_c_style(name, msg, NULL, 0);
2852 strbuf_addf(msg, "%s\n%s%srename to ",
2853 reset, line_prefix, set);
2854 quote_c_style(other, msg, NULL, 0);
2855 strbuf_addf(msg, "%s\n", reset);
2856 break;
2857 case DIFF_STATUS_MODIFIED:
2858 if (p->score) {
2859 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2860 line_prefix,
2861 set, similarity_index(p), reset);
2862 break;
2863 }
2864 /* fallthru */
2865 default:
2866 *must_show_header = 0;
2867 }
2868 if (one && two && hashcmp(one->sha1, two->sha1)) {
2869 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2870
2871 if (DIFF_OPT_TST(o, BINARY)) {
2872 mmfile_t mf;
2873 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2874 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2875 abbrev = 40;
2876 }
2877 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2878 find_unique_abbrev(one->sha1, abbrev));
2879 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2880 if (one->mode == two->mode)
2881 strbuf_addf(msg, " %06o", one->mode);
2882 strbuf_addf(msg, "%s\n", reset);
2883 }
2884 }
2885
2886 static void run_diff_cmd(const char *pgm,
2887 const char *name,
2888 const char *other,
2889 const char *attr_path,
2890 struct diff_filespec *one,
2891 struct diff_filespec *two,
2892 struct strbuf *msg,
2893 struct diff_options *o,
2894 struct diff_filepair *p)
2895 {
2896 const char *xfrm_msg = NULL;
2897 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2898 int must_show_header = 0;
2899
2900 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2901 pgm = NULL;
2902 else {
2903 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2904 if (drv && drv->external)
2905 pgm = drv->external;
2906 }
2907
2908 if (msg) {
2909 /*
2910 * don't use colors when the header is intended for an
2911 * external diff driver
2912 */
2913 fill_metainfo(msg, name, other, one, two, o, p,
2914 &must_show_header,
2915 want_color(o->use_color) && !pgm);
2916 xfrm_msg = msg->len ? msg->buf : NULL;
2917 }
2918
2919 if (pgm) {
2920 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2921 complete_rewrite);
2922 return;
2923 }
2924 if (one && two)
2925 builtin_diff(name, other ? other : name,
2926 one, two, xfrm_msg, must_show_header,
2927 o, complete_rewrite);
2928 else
2929 fprintf(o->file, "* Unmerged path %s\n", name);
2930 }
2931
2932 static void diff_fill_sha1_info(struct diff_filespec *one)
2933 {
2934 if (DIFF_FILE_VALID(one)) {
2935 if (!one->sha1_valid) {
2936 struct stat st;
2937 if (!strcmp(one->path, "-")) {
2938 hashcpy(one->sha1, null_sha1);
2939 return;
2940 }
2941 if (lstat(one->path, &st) < 0)
2942 die_errno("stat '%s'", one->path);
2943 if (index_path(one->sha1, one->path, &st, 0))
2944 die("cannot hash %s", one->path);
2945 }
2946 }
2947 else
2948 hashclr(one->sha1);
2949 }
2950
2951 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2952 {
2953 /* Strip the prefix but do not molest /dev/null and absolute paths */
2954 if (*namep && **namep != '/') {
2955 *namep += prefix_length;
2956 if (**namep == '/')
2957 ++*namep;
2958 }
2959 if (*otherp && **otherp != '/') {
2960 *otherp += prefix_length;
2961 if (**otherp == '/')
2962 ++*otherp;
2963 }
2964 }
2965
2966 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2967 {
2968 const char *pgm = external_diff();
2969 struct strbuf msg;
2970 struct diff_filespec *one = p->one;
2971 struct diff_filespec *two = p->two;
2972 const char *name;
2973 const char *other;
2974 const char *attr_path;
2975
2976 name = p->one->path;
2977 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2978 attr_path = name;
2979 if (o->prefix_length)
2980 strip_prefix(o->prefix_length, &name, &other);
2981
2982 if (DIFF_PAIR_UNMERGED(p)) {
2983 run_diff_cmd(pgm, name, NULL, attr_path,
2984 NULL, NULL, NULL, o, p);
2985 return;
2986 }
2987
2988 diff_fill_sha1_info(one);
2989 diff_fill_sha1_info(two);
2990
2991 if (!pgm &&
2992 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2993 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2994 /*
2995 * a filepair that changes between file and symlink
2996 * needs to be split into deletion and creation.
2997 */
2998 struct diff_filespec *null = alloc_filespec(two->path);
2999 run_diff_cmd(NULL, name, other, attr_path,
3000 one, null, &msg, o, p);
3001 free(null);
3002 strbuf_release(&msg);
3003
3004 null = alloc_filespec(one->path);
3005 run_diff_cmd(NULL, name, other, attr_path,
3006 null, two, &msg, o, p);
3007 free(null);
3008 }
3009 else
3010 run_diff_cmd(pgm, name, other, attr_path,
3011 one, two, &msg, o, p);
3012
3013 strbuf_release(&msg);
3014 }
3015
3016 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3017 struct diffstat_t *diffstat)
3018 {
3019 const char *name;
3020 const char *other;
3021 int complete_rewrite = 0;
3022
3023 if (DIFF_PAIR_UNMERGED(p)) {
3024 /* unmerged */
3025 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3026 return;
3027 }
3028
3029 name = p->one->path;
3030 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3031
3032 if (o->prefix_length)
3033 strip_prefix(o->prefix_length, &name, &other);
3034
3035 diff_fill_sha1_info(p->one);
3036 diff_fill_sha1_info(p->two);
3037
3038 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3039 complete_rewrite = 1;
3040 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3041 }
3042
3043 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3044 {
3045 const char *name;
3046 const char *other;
3047 const char *attr_path;
3048
3049 if (DIFF_PAIR_UNMERGED(p)) {
3050 /* unmerged */
3051 return;
3052 }
3053
3054 name = p->one->path;
3055 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3056 attr_path = other ? other : name;
3057
3058 if (o->prefix_length)
3059 strip_prefix(o->prefix_length, &name, &other);
3060
3061 diff_fill_sha1_info(p->one);
3062 diff_fill_sha1_info(p->two);
3063
3064 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3065 }
3066
3067 void diff_setup(struct diff_options *options)
3068 {
3069 memcpy(options, &default_diff_options, sizeof(*options));
3070
3071 options->file = stdout;
3072
3073 options->line_termination = '\n';
3074 options->break_opt = -1;
3075 options->rename_limit = -1;
3076 options->dirstat_permille = diff_dirstat_permille_default;
3077 options->context = 3;
3078
3079 options->change = diff_change;
3080 options->add_remove = diff_addremove;
3081 options->use_color = diff_use_color_default;
3082 options->detect_rename = diff_detect_rename_default;
3083
3084 if (diff_no_prefix) {
3085 options->a_prefix = options->b_prefix = "";
3086 } else if (!diff_mnemonic_prefix) {
3087 options->a_prefix = "a/";
3088 options->b_prefix = "b/";
3089 }
3090 }
3091
3092 int diff_setup_done(struct diff_options *options)
3093 {
3094 int count = 0;
3095
3096 if (options->output_format & DIFF_FORMAT_NAME)
3097 count++;
3098 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3099 count++;
3100 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3101 count++;
3102 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3103 count++;
3104 if (count > 1)
3105 die("--name-only, --name-status, --check and -s are mutually exclusive");
3106
3107 /*
3108 * Most of the time we can say "there are changes"
3109 * only by checking if there are changed paths, but
3110 * --ignore-whitespace* options force us to look
3111 * inside contents.
3112 */
3113
3114 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3115 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3116 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3117 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3118 else
3119 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3120
3121 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3122 options->detect_rename = DIFF_DETECT_COPY;
3123
3124 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3125 options->prefix = NULL;
3126 if (options->prefix)
3127 options->prefix_length = strlen(options->prefix);
3128 else
3129 options->prefix_length = 0;
3130
3131 if (options->output_format & (DIFF_FORMAT_NAME |
3132 DIFF_FORMAT_NAME_STATUS |
3133 DIFF_FORMAT_CHECKDIFF |
3134 DIFF_FORMAT_NO_OUTPUT))
3135 options->output_format &= ~(DIFF_FORMAT_RAW |
3136 DIFF_FORMAT_NUMSTAT |
3137 DIFF_FORMAT_DIFFSTAT |
3138 DIFF_FORMAT_SHORTSTAT |
3139 DIFF_FORMAT_DIRSTAT |
3140 DIFF_FORMAT_SUMMARY |
3141 DIFF_FORMAT_PATCH);
3142
3143 /*
3144 * These cases always need recursive; we do not drop caller-supplied
3145 * recursive bits for other formats here.
3146 */
3147 if (options->output_format & (DIFF_FORMAT_PATCH |
3148 DIFF_FORMAT_NUMSTAT |
3149 DIFF_FORMAT_DIFFSTAT |
3150 DIFF_FORMAT_SHORTSTAT |
3151 DIFF_FORMAT_DIRSTAT |
3152 DIFF_FORMAT_SUMMARY |
3153 DIFF_FORMAT_CHECKDIFF))
3154 DIFF_OPT_SET(options, RECURSIVE);
3155 /*
3156 * Also pickaxe would not work very well if you do not say recursive
3157 */
3158 if (options->pickaxe)
3159 DIFF_OPT_SET(options, RECURSIVE);
3160 /*
3161 * When patches are generated, submodules diffed against the work tree
3162 * must be checked for dirtiness too so it can be shown in the output
3163 */
3164 if (options->output_format & DIFF_FORMAT_PATCH)
3165 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3166
3167 if (options->detect_rename && options->rename_limit < 0)
3168 options->rename_limit = diff_rename_limit_default;
3169 if (options->setup & DIFF_SETUP_USE_CACHE) {
3170 if (!active_cache)
3171 /* read-cache does not die even when it fails
3172 * so it is safe for us to do this here. Also
3173 * it does not smudge active_cache or active_nr
3174 * when it fails, so we do not have to worry about
3175 * cleaning it up ourselves either.
3176 */
3177 read_cache();
3178 }
3179 if (options->abbrev <= 0 || 40 < options->abbrev)
3180 options->abbrev = 40; /* full */
3181
3182 /*
3183 * It does not make sense to show the first hit we happened
3184 * to have found. It does not make sense not to return with
3185 * exit code in such a case either.
3186 */
3187 if (DIFF_OPT_TST(options, QUICK)) {
3188 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3189 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3190 }
3191
3192 return 0;
3193 }
3194
3195 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3196 {
3197 char c, *eq;
3198 int len;
3199
3200 if (*arg != '-')
3201 return 0;
3202 c = *++arg;
3203 if (!c)
3204 return 0;
3205 if (c == arg_short) {
3206 c = *++arg;
3207 if (!c)
3208 return 1;
3209 if (val && isdigit(c)) {
3210 char *end;
3211 int n = strtoul(arg, &end, 10);
3212 if (*end)
3213 return 0;
3214 *val = n;
3215 return 1;
3216 }
3217 return 0;
3218 }
3219 if (c != '-')
3220 return 0;
3221 arg++;
3222 eq = strchr(arg, '=');
3223 if (eq)
3224 len = eq - arg;
3225 else
3226 len = strlen(arg);
3227 if (!len || strncmp(arg, arg_long, len))
3228 return 0;
3229 if (eq) {
3230 int n;
3231 char *end;
3232 if (!isdigit(*++eq))
3233 return 0;
3234 n = strtoul(eq, &end, 10);
3235 if (*end)
3236 return 0;
3237 *val = n;
3238 }
3239 return 1;
3240 }
3241
3242 static int diff_scoreopt_parse(const char *opt);
3243
3244 static inline int short_opt(char opt, const char **argv,
3245 const char **optarg)
3246 {
3247 const char *arg = argv[0];
3248 if (arg[0] != '-' || arg[1] != opt)
3249 return 0;
3250 if (arg[2] != '\0') {
3251 *optarg = arg + 2;
3252 return 1;
3253 }
3254 if (!argv[1])
3255 die("Option '%c' requires a value", opt);
3256 *optarg = argv[1];
3257 return 2;
3258 }
3259
3260 int parse_long_opt(const char *opt, const char **argv,
3261 const char **optarg)
3262 {
3263 const char *arg = argv[0];
3264 if (arg[0] != '-' || arg[1] != '-')
3265 return 0;
3266 arg += strlen("--");
3267 if (prefixcmp(arg, opt))
3268 return 0;
3269 arg += strlen(opt);
3270 if (*arg == '=') { /* sticked form: --option=value */
3271 *optarg = arg + 1;
3272 return 1;
3273 }
3274 if (*arg != '\0')
3275 return 0;
3276 /* separate form: --option value */
3277 if (!argv[1])
3278 die("Option '--%s' requires a value", opt);
3279 *optarg = argv[1];
3280 return 2;
3281 }
3282
3283 static int stat_opt(struct diff_options *options, const char **av)
3284 {
3285 const char *arg = av[0];
3286 char *end;
3287 int width = options->stat_width;
3288 int name_width = options->stat_name_width;
3289 int count = options->stat_count;
3290 int argcount = 1;
3291
3292 arg += strlen("--stat");
3293 end = (char *)arg;
3294
3295 switch (*arg) {
3296 case '-':
3297 if (!prefixcmp(arg, "-width")) {
3298 arg += strlen("-width");
3299 if (*arg == '=')
3300 width = strtoul(arg + 1, &end, 10);
3301 else if (!*arg && !av[1])
3302 die("Option '--stat-width' requires a value");
3303 else if (!*arg) {
3304 width = strtoul(av[1], &end, 10);
3305 argcount = 2;
3306 }
3307 } else if (!prefixcmp(arg, "-name-width")) {
3308 arg += strlen("-name-width");
3309 if (*arg == '=')
3310 name_width = strtoul(arg + 1, &end, 10);
3311 else if (!*arg && !av[1])
3312 die("Option '--stat-name-width' requires a value");
3313 else if (!*arg) {
3314 name_width = strtoul(av[1], &end, 10);
3315 argcount = 2;
3316 }
3317 } else if (!prefixcmp(arg, "-count")) {
3318 arg += strlen("-count");
3319 if (*arg == '=')
3320 count = strtoul(arg + 1, &end, 10);
3321 else if (!*arg && !av[1])
3322 die("Option '--stat-count' requires a value");
3323 else if (!*arg) {
3324 count = strtoul(av[1], &end, 10);
3325 argcount = 2;
3326 }
3327 }
3328 break;
3329 case '=':
3330 width = strtoul(arg+1, &end, 10);
3331 if (*end == ',')
3332 name_width = strtoul(end+1, &end, 10);
3333 if (*end == ',')
3334 count = strtoul(end+1, &end, 10);
3335 }
3336
3337 /* Important! This checks all the error cases! */
3338 if (*end)
3339 return 0;
3340 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3341 options->stat_name_width = name_width;
3342 options->stat_width = width;
3343 options->stat_count = count;
3344 return argcount;
3345 }
3346
3347 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3348 {
3349 struct strbuf errmsg = STRBUF_INIT;
3350 if (parse_dirstat_params(options, params, &errmsg))
3351 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3352 errmsg.buf);
3353 strbuf_release(&errmsg);
3354 /*
3355 * The caller knows a dirstat-related option is given from the command
3356 * line; allow it to say "return this_function();"
3357 */
3358 options->output_format |= DIFF_FORMAT_DIRSTAT;
3359 return 1;
3360 }
3361
3362 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3363 {
3364 const char *arg = av[0];
3365 const char *optarg;
3366 int argcount;
3367
3368 /* Output format options */
3369 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3370 options->output_format |= DIFF_FORMAT_PATCH;
3371 else if (opt_arg(arg, 'U', "unified", &options->context))
3372 options->output_format |= DIFF_FORMAT_PATCH;
3373 else if (!strcmp(arg, "--raw"))
3374 options->output_format |= DIFF_FORMAT_RAW;
3375 else if (!strcmp(arg, "--patch-with-raw"))
3376 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3377 else if (!strcmp(arg, "--numstat"))
3378 options->output_format |= DIFF_FORMAT_NUMSTAT;
3379 else if (!strcmp(arg, "--shortstat"))
3380 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3381 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3382 return parse_dirstat_opt(options, "");
3383 else if (!prefixcmp(arg, "-X"))
3384 return parse_dirstat_opt(options, arg + 2);
3385 else if (!prefixcmp(arg, "--dirstat="))
3386 return parse_dirstat_opt(options, arg + 10);
3387 else if (!strcmp(arg, "--cumulative"))
3388 return parse_dirstat_opt(options, "cumulative");
3389 else if (!strcmp(arg, "--dirstat-by-file"))
3390 return parse_dirstat_opt(options, "files");
3391 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3392 parse_dirstat_opt(options, "files");
3393 return parse_dirstat_opt(options, arg + 18);
3394 }
3395 else if (!strcmp(arg, "--check"))
3396 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3397 else if (!strcmp(arg, "--summary"))
3398 options->output_format |= DIFF_FORMAT_SUMMARY;
3399 else if (!strcmp(arg, "--patch-with-stat"))
3400 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3401 else if (!strcmp(arg, "--name-only"))
3402 options->output_format |= DIFF_FORMAT_NAME;
3403 else if (!strcmp(arg, "--name-status"))
3404 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3405 else if (!strcmp(arg, "-s"))
3406 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3407 else if (!prefixcmp(arg, "--stat"))
3408 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3409 return stat_opt(options, av);
3410
3411 /* renames options */
3412 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3413 !strcmp(arg, "--break-rewrites")) {
3414 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3415 return error("invalid argument to -B: %s", arg+2);
3416 }
3417 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3418 !strcmp(arg, "--find-renames")) {
3419 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3420 return error("invalid argument to -M: %s", arg+2);
3421 options->detect_rename = DIFF_DETECT_RENAME;
3422 }
3423 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3424 options->irreversible_delete = 1;
3425 }
3426 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3427 !strcmp(arg, "--find-copies")) {
3428 if (options->detect_rename == DIFF_DETECT_COPY)
3429 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3430 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3431 return error("invalid argument to -C: %s", arg+2);
3432 options->detect_rename = DIFF_DETECT_COPY;
3433 }
3434 else if (!strcmp(arg, "--no-renames"))
3435 options->detect_rename = 0;
3436 else if (!strcmp(arg, "--relative"))
3437 DIFF_OPT_SET(options, RELATIVE_NAME);
3438 else if (!prefixcmp(arg, "--relative=")) {
3439 DIFF_OPT_SET(options, RELATIVE_NAME);
3440 options->prefix = arg + 11;
3441 }
3442
3443 /* xdiff options */
3444 else if (!strcmp(arg, "--minimal"))
3445 DIFF_XDL_SET(options, NEED_MINIMAL);
3446 else if (!strcmp(arg, "--no-minimal"))
3447 DIFF_XDL_CLR(options, NEED_MINIMAL);
3448 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3449 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3450 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3451 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3452 else if (!strcmp(arg, "--ignore-space-at-eol"))
3453 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3454 else if (!strcmp(arg, "--patience"))
3455 DIFF_XDL_SET(options, PATIENCE_DIFF);
3456 else if (!strcmp(arg, "--histogram"))
3457 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3458
3459 /* flags options */
3460 else if (!strcmp(arg, "--binary")) {
3461 options->output_format |= DIFF_FORMAT_PATCH;
3462 DIFF_OPT_SET(options, BINARY);
3463 }
3464 else if (!strcmp(arg, "--full-index"))
3465 DIFF_OPT_SET(options, FULL_INDEX);
3466 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3467 DIFF_OPT_SET(options, TEXT);
3468 else if (!strcmp(arg, "-R"))
3469 DIFF_OPT_SET(options, REVERSE_DIFF);
3470 else if (!strcmp(arg, "--find-copies-harder"))
3471 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3472 else if (!strcmp(arg, "--follow"))
3473 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3474 else if (!strcmp(arg, "--color"))
3475 options->use_color = 1;
3476 else if (!prefixcmp(arg, "--color=")) {
3477 int value = git_config_colorbool(NULL, arg+8);
3478 if (value < 0)
3479 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3480 options->use_color = value;
3481 }
3482 else if (!strcmp(arg, "--no-color"))
3483 options->use_color = 0;
3484 else if (!strcmp(arg, "--color-words")) {
3485 options->use_color = 1;
3486 options->word_diff = DIFF_WORDS_COLOR;
3487 }
3488 else if (!prefixcmp(arg, "--color-words=")) {
3489 options->use_color = 1;
3490 options->word_diff = DIFF_WORDS_COLOR;
3491 options->word_regex = arg + 14;
3492 }
3493 else if (!strcmp(arg, "--word-diff")) {
3494 if (options->word_diff == DIFF_WORDS_NONE)
3495 options->word_diff = DIFF_WORDS_PLAIN;
3496 }
3497 else if (!prefixcmp(arg, "--word-diff=")) {
3498 const char *type = arg + 12;
3499 if (!strcmp(type, "plain"))
3500 options->word_diff = DIFF_WORDS_PLAIN;
3501 else if (!strcmp(type, "color")) {
3502 options->use_color = 1;
3503 options->word_diff = DIFF_WORDS_COLOR;
3504 }
3505 else if (!strcmp(type, "porcelain"))
3506 options->word_diff = DIFF_WORDS_PORCELAIN;
3507 else if (!strcmp(type, "none"))
3508 options->word_diff = DIFF_WORDS_NONE;
3509 else
3510 die("bad --word-diff argument: %s", type);
3511 }
3512 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3513 if (options->word_diff == DIFF_WORDS_NONE)
3514 options->word_diff = DIFF_WORDS_PLAIN;
3515 options->word_regex = optarg;
3516 return argcount;
3517 }
3518 else if (!strcmp(arg, "--exit-code"))
3519 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3520 else if (!strcmp(arg, "--quiet"))
3521 DIFF_OPT_SET(options, QUICK);
3522 else if (!strcmp(arg, "--ext-diff"))
3523 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3524 else if (!strcmp(arg, "--no-ext-diff"))
3525 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3526 else if (!strcmp(arg, "--textconv"))
3527 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3528 else if (!strcmp(arg, "--no-textconv"))
3529 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3530 else if (!strcmp(arg, "--ignore-submodules")) {
3531 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3532 handle_ignore_submodules_arg(options, "all");
3533 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3534 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3535 handle_ignore_submodules_arg(options, arg + 20);
3536 } else if (!strcmp(arg, "--submodule"))
3537 DIFF_OPT_SET(options, SUBMODULE_LOG);
3538 else if (!prefixcmp(arg, "--submodule=")) {
3539 if (!strcmp(arg + 12, "log"))
3540 DIFF_OPT_SET(options, SUBMODULE_LOG);
3541 }
3542
3543 /* misc options */
3544 else if (!strcmp(arg, "-z"))
3545 options->line_termination = 0;
3546 else if ((argcount = short_opt('l', av, &optarg))) {
3547 options->rename_limit = strtoul(optarg, NULL, 10);
3548 return argcount;
3549 }
3550 else if ((argcount = short_opt('S', av, &optarg))) {
3551 options->pickaxe = optarg;
3552 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3553 return argcount;
3554 } else if ((argcount = short_opt('G', av, &optarg))) {
3555 options->pickaxe = optarg;
3556 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3557 return argcount;
3558 }
3559 else if (!strcmp(arg, "--pickaxe-all"))
3560 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3561 else if (!strcmp(arg, "--pickaxe-regex"))
3562 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3563 else if ((argcount = short_opt('O', av, &optarg))) {
3564 options->orderfile = optarg;
3565 return argcount;
3566 }
3567 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3568 options->filter = optarg;
3569 return argcount;
3570 }
3571 else if (!strcmp(arg, "--abbrev"))
3572 options->abbrev = DEFAULT_ABBREV;
3573 else if (!prefixcmp(arg, "--abbrev=")) {
3574 options->abbrev = strtoul(arg + 9, NULL, 10);
3575 if (options->abbrev < MINIMUM_ABBREV)
3576 options->abbrev = MINIMUM_ABBREV;
3577 else if (40 < options->abbrev)
3578 options->abbrev = 40;
3579 }
3580 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3581 options->a_prefix = optarg;
3582 return argcount;
3583 }
3584 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3585 options->b_prefix = optarg;
3586 return argcount;
3587 }
3588 else if (!strcmp(arg, "--no-prefix"))
3589 options->a_prefix = options->b_prefix = "";
3590 else if (opt_arg(arg, '\0', "inter-hunk-context",
3591 &options->interhunkcontext))
3592 ;
3593 else if (!strcmp(arg, "-W"))
3594 DIFF_OPT_SET(options, FUNCCONTEXT);
3595 else if (!strcmp(arg, "--function-context"))
3596 DIFF_OPT_SET(options, FUNCCONTEXT);
3597 else if (!strcmp(arg, "--no-function-context"))
3598 DIFF_OPT_CLR(options, FUNCCONTEXT);
3599 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3600 options->file = fopen(optarg, "w");
3601 if (!options->file)
3602 die_errno("Could not open '%s'", optarg);
3603 options->close_file = 1;
3604 return argcount;
3605 } else
3606 return 0;
3607 return 1;
3608 }
3609
3610 int parse_rename_score(const char **cp_p)
3611 {
3612 unsigned long num, scale;
3613 int ch, dot;
3614 const char *cp = *cp_p;
3615
3616 num = 0;
3617 scale = 1;
3618 dot = 0;
3619 for (;;) {
3620 ch = *cp;
3621 if ( !dot && ch == '.' ) {
3622 scale = 1;
3623 dot = 1;
3624 } else if ( ch == '%' ) {
3625 scale = dot ? scale*100 : 100;
3626 cp++; /* % is always at the end */
3627 break;
3628 } else if ( ch >= '0' && ch <= '9' ) {
3629 if ( scale < 100000 ) {
3630 scale *= 10;
3631 num = (num*10) + (ch-'0');
3632 }
3633 } else {
3634 break;
3635 }
3636 cp++;
3637 }
3638 *cp_p = cp;
3639
3640 /* user says num divided by scale and we say internally that
3641 * is MAX_SCORE * num / scale.
3642 */
3643 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3644 }
3645
3646 static int diff_scoreopt_parse(const char *opt)
3647 {
3648 int opt1, opt2, cmd;
3649
3650 if (*opt++ != '-')
3651 return -1;
3652 cmd = *opt++;
3653 if (cmd == '-') {
3654 /* convert the long-form arguments into short-form versions */
3655 if (!prefixcmp(opt, "break-rewrites")) {
3656 opt += strlen("break-rewrites");
3657 if (*opt == 0 || *opt++ == '=')
3658 cmd = 'B';
3659 } else if (!prefixcmp(opt, "find-copies")) {
3660 opt += strlen("find-copies");
3661 if (*opt == 0 || *opt++ == '=')
3662 cmd = 'C';
3663 } else if (!prefixcmp(opt, "find-renames")) {
3664 opt += strlen("find-renames");
3665 if (*opt == 0 || *opt++ == '=')
3666 cmd = 'M';
3667 }
3668 }
3669 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3670 return -1; /* that is not a -M, -C nor -B option */
3671
3672 opt1 = parse_rename_score(&opt);
3673 if (cmd != 'B')
3674 opt2 = 0;
3675 else {
3676 if (*opt == 0)
3677 opt2 = 0;
3678 else if (*opt != '/')
3679 return -1; /* we expect -B80/99 or -B80 */
3680 else {
3681 opt++;
3682 opt2 = parse_rename_score(&opt);
3683 }
3684 }
3685 if (*opt != 0)
3686 return -1;
3687 return opt1 | (opt2 << 16);
3688 }
3689
3690 struct diff_queue_struct diff_queued_diff;
3691
3692 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3693 {
3694 if (queue->alloc <= queue->nr) {
3695 queue->alloc = alloc_nr(queue->alloc);
3696 queue->queue = xrealloc(queue->queue,
3697 sizeof(dp) * queue->alloc);
3698 }
3699 queue->queue[queue->nr++] = dp;
3700 }
3701
3702 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3703 struct diff_filespec *one,
3704 struct diff_filespec *two)
3705 {
3706 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3707 dp->one = one;
3708 dp->two = two;
3709 if (queue)
3710 diff_q(queue, dp);
3711 return dp;
3712 }
3713
3714 void diff_free_filepair(struct diff_filepair *p)
3715 {
3716 free_filespec(p->one);
3717 free_filespec(p->two);
3718 free(p);
3719 }
3720
3721 /* This is different from find_unique_abbrev() in that
3722 * it stuffs the result with dots for alignment.
3723 */
3724 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3725 {
3726 int abblen;
3727 const char *abbrev;
3728 if (len == 40)
3729 return sha1_to_hex(sha1);
3730
3731 abbrev = find_unique_abbrev(sha1, len);
3732 abblen = strlen(abbrev);
3733 if (abblen < 37) {
3734 static char hex[41];
3735 if (len < abblen && abblen <= len + 2)
3736 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3737 else
3738 sprintf(hex, "%s...", abbrev);
3739 return hex;
3740 }
3741 return sha1_to_hex(sha1);
3742 }
3743
3744 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3745 {
3746 int line_termination = opt->line_termination;
3747 int inter_name_termination = line_termination ? '\t' : '\0';
3748 if (opt->output_prefix) {
3749 struct strbuf *msg = NULL;
3750 msg = opt->output_prefix(opt, opt->output_prefix_data);
3751 fprintf(opt->file, "%s", msg->buf);
3752 }
3753
3754 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3755 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3756 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3757 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3758 }
3759 if (p->score) {
3760 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3761 inter_name_termination);
3762 } else {
3763 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3764 }
3765
3766 if (p->status == DIFF_STATUS_COPIED ||
3767 p->status == DIFF_STATUS_RENAMED) {
3768 const char *name_a, *name_b;
3769 name_a = p->one->path;
3770 name_b = p->two->path;
3771 strip_prefix(opt->prefix_length, &name_a, &name_b);
3772 write_name_quoted(name_a, opt->file, inter_name_termination);
3773 write_name_quoted(name_b, opt->file, line_termination);
3774 } else {
3775 const char *name_a, *name_b;
3776 name_a = p->one->mode ? p->one->path : p->two->path;
3777 name_b = NULL;
3778 strip_prefix(opt->prefix_length, &name_a, &name_b);
3779 write_name_quoted(name_a, opt->file, line_termination);
3780 }
3781 }
3782
3783 int diff_unmodified_pair(struct diff_filepair *p)
3784 {
3785 /* This function is written stricter than necessary to support
3786 * the currently implemented transformers, but the idea is to
3787 * let transformers to produce diff_filepairs any way they want,
3788 * and filter and clean them up here before producing the output.
3789 */
3790 struct diff_filespec *one = p->one, *two = p->two;
3791
3792 if (DIFF_PAIR_UNMERGED(p))
3793 return 0; /* unmerged is interesting */
3794
3795 /* deletion, addition, mode or type change
3796 * and rename are all interesting.
3797 */
3798 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3799 DIFF_PAIR_MODE_CHANGED(p) ||
3800 strcmp(one->path, two->path))
3801 return 0;
3802
3803 /* both are valid and point at the same path. that is, we are
3804 * dealing with a change.
3805 */
3806 if (one->sha1_valid && two->sha1_valid &&
3807 !hashcmp(one->sha1, two->sha1) &&
3808 !one->dirty_submodule && !two->dirty_submodule)
3809 return 1; /* no change */
3810 if (!one->sha1_valid && !two->sha1_valid)
3811 return 1; /* both look at the same file on the filesystem. */
3812 return 0;
3813 }
3814
3815 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3816 {
3817 if (diff_unmodified_pair(p))
3818 return;
3819
3820 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3821 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3822 return; /* no tree diffs in patch format */
3823
3824 run_diff(p, o);
3825 }
3826
3827 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3828 struct diffstat_t *diffstat)
3829 {
3830 if (diff_unmodified_pair(p))
3831 return;
3832
3833 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3834 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3835 return; /* no useful stat for tree diffs */
3836
3837 run_diffstat(p, o, diffstat);
3838 }
3839
3840 static void diff_flush_checkdiff(struct diff_filepair *p,
3841 struct diff_options *o)
3842 {
3843 if (diff_unmodified_pair(p))
3844 return;
3845
3846 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3847 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3848 return; /* nothing to check in tree diffs */
3849
3850 run_checkdiff(p, o);
3851 }
3852
3853 int diff_queue_is_empty(void)
3854 {
3855 struct diff_queue_struct *q = &diff_queued_diff;
3856 int i;
3857 for (i = 0; i < q->nr; i++)
3858 if (!diff_unmodified_pair(q->queue[i]))
3859 return 0;
3860 return 1;
3861 }
3862
3863 #if DIFF_DEBUG
3864 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3865 {
3866 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3867 x, one ? one : "",
3868 s->path,
3869 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3870 s->mode,
3871 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3872 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3873 x, one ? one : "",
3874 s->size, s->xfrm_flags);
3875 }
3876
3877 void diff_debug_filepair(const struct diff_filepair *p, int i)
3878 {
3879 diff_debug_filespec(p->one, i, "one");
3880 diff_debug_filespec(p->two, i, "two");
3881 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3882 p->score, p->status ? p->status : '?',
3883 p->one->rename_used, p->broken_pair);
3884 }
3885
3886 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3887 {
3888 int i;
3889 if (msg)
3890 fprintf(stderr, "%s\n", msg);
3891 fprintf(stderr, "q->nr = %d\n", q->nr);
3892 for (i = 0; i < q->nr; i++) {
3893 struct diff_filepair *p = q->queue[i];
3894 diff_debug_filepair(p, i);
3895 }
3896 }
3897 #endif
3898
3899 static void diff_resolve_rename_copy(void)
3900 {
3901 int i;
3902 struct diff_filepair *p;
3903 struct diff_queue_struct *q = &diff_queued_diff;
3904
3905 diff_debug_queue("resolve-rename-copy", q);
3906
3907 for (i = 0; i < q->nr; i++) {
3908 p = q->queue[i];
3909 p->status = 0; /* undecided */
3910 if (DIFF_PAIR_UNMERGED(p))
3911 p->status = DIFF_STATUS_UNMERGED;
3912 else if (!DIFF_FILE_VALID(p->one))
3913 p->status = DIFF_STATUS_ADDED;
3914 else if (!DIFF_FILE_VALID(p->two))
3915 p->status = DIFF_STATUS_DELETED;
3916 else if (DIFF_PAIR_TYPE_CHANGED(p))
3917 p->status = DIFF_STATUS_TYPE_CHANGED;
3918
3919 /* from this point on, we are dealing with a pair
3920 * whose both sides are valid and of the same type, i.e.
3921 * either in-place edit or rename/copy edit.
3922 */
3923 else if (DIFF_PAIR_RENAME(p)) {
3924 /*
3925 * A rename might have re-connected a broken
3926 * pair up, causing the pathnames to be the
3927 * same again. If so, that's not a rename at
3928 * all, just a modification..
3929 *
3930 * Otherwise, see if this source was used for
3931 * multiple renames, in which case we decrement
3932 * the count, and call it a copy.
3933 */
3934 if (!strcmp(p->one->path, p->two->path))
3935 p->status = DIFF_STATUS_MODIFIED;
3936 else if (--p->one->rename_used > 0)
3937 p->status = DIFF_STATUS_COPIED;
3938 else
3939 p->status = DIFF_STATUS_RENAMED;
3940 }
3941 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3942 p->one->mode != p->two->mode ||
3943 p->one->dirty_submodule ||
3944 p->two->dirty_submodule ||
3945 is_null_sha1(p->one->sha1))
3946 p->status = DIFF_STATUS_MODIFIED;
3947 else {
3948 /* This is a "no-change" entry and should not
3949 * happen anymore, but prepare for broken callers.
3950 */
3951 error("feeding unmodified %s to diffcore",
3952 p->one->path);
3953 p->status = DIFF_STATUS_UNKNOWN;
3954 }
3955 }
3956 diff_debug_queue("resolve-rename-copy done", q);
3957 }
3958
3959 static int check_pair_status(struct diff_filepair *p)
3960 {
3961 switch (p->status) {
3962 case DIFF_STATUS_UNKNOWN:
3963 return 0;
3964 case 0:
3965 die("internal error in diff-resolve-rename-copy");
3966 default:
3967 return 1;
3968 }
3969 }
3970
3971 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3972 {
3973 int fmt = opt->output_format;
3974
3975 if (fmt & DIFF_FORMAT_CHECKDIFF)
3976 diff_flush_checkdiff(p, opt);
3977 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3978 diff_flush_raw(p, opt);
3979 else if (fmt & DIFF_FORMAT_NAME) {
3980 const char *name_a, *name_b;
3981 name_a = p->two->path;
3982 name_b = NULL;
3983 strip_prefix(opt->prefix_length, &name_a, &name_b);
3984 write_name_quoted(name_a, opt->file, opt->line_termination);
3985 }
3986 }
3987
3988 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3989 {
3990 if (fs->mode)
3991 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3992 else
3993 fprintf(file, " %s ", newdelete);
3994 write_name_quoted(fs->path, file, '\n');
3995 }
3996
3997
3998 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3999 const char *line_prefix)
4000 {
4001 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4002 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4003 p->two->mode, show_name ? ' ' : '\n');
4004 if (show_name) {
4005 write_name_quoted(p->two->path, file, '\n');
4006 }
4007 }
4008 }
4009
4010 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4011 const char *line_prefix)
4012 {
4013 char *names = pprint_rename(p->one->path, p->two->path);
4014
4015 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4016 free(names);
4017 show_mode_change(file, p, 0, line_prefix);
4018 }
4019
4020 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4021 {
4022 FILE *file = opt->file;
4023 char *line_prefix = "";
4024
4025 if (opt->output_prefix) {
4026 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4027 line_prefix = buf->buf;
4028 }
4029
4030 switch(p->status) {
4031 case DIFF_STATUS_DELETED:
4032 fputs(line_prefix, file);
4033 show_file_mode_name(file, "delete", p->one);
4034 break;
4035 case DIFF_STATUS_ADDED:
4036 fputs(line_prefix, file);
4037 show_file_mode_name(file, "create", p->two);
4038 break;
4039 case DIFF_STATUS_COPIED:
4040 fputs(line_prefix, file);
4041 show_rename_copy(file, "copy", p, line_prefix);
4042 break;
4043 case DIFF_STATUS_RENAMED:
4044 fputs(line_prefix, file);
4045 show_rename_copy(file, "rename", p, line_prefix);
4046 break;
4047 default:
4048 if (p->score) {
4049 fprintf(file, "%s rewrite ", line_prefix);
4050 write_name_quoted(p->two->path, file, ' ');
4051 fprintf(file, "(%d%%)\n", similarity_index(p));
4052 }
4053 show_mode_change(file, p, !p->score, line_prefix);
4054 break;
4055 }
4056 }
4057
4058 struct patch_id_t {
4059 git_SHA_CTX *ctx;
4060 int patchlen;
4061 };
4062
4063 static int remove_space(char *line, int len)
4064 {
4065 int i;
4066 char *dst = line;
4067 unsigned char c;
4068
4069 for (i = 0; i < len; i++)
4070 if (!isspace((c = line[i])))
4071 *dst++ = c;
4072
4073 return dst - line;
4074 }
4075
4076 static void patch_id_consume(void *priv, char *line, unsigned long len)
4077 {
4078 struct patch_id_t *data = priv;
4079 int new_len;
4080
4081 /* Ignore line numbers when computing the SHA1 of the patch */
4082 if (!prefixcmp(line, "@@ -"))
4083 return;
4084
4085 new_len = remove_space(line, len);
4086
4087 git_SHA1_Update(data->ctx, line, new_len);
4088 data->patchlen += new_len;
4089 }
4090
4091 /* returns 0 upon success, and writes result into sha1 */
4092 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4093 {
4094 struct diff_queue_struct *q = &diff_queued_diff;
4095 int i;
4096 git_SHA_CTX ctx;
4097 struct patch_id_t data;
4098 char buffer[PATH_MAX * 4 + 20];
4099
4100 git_SHA1_Init(&ctx);
4101 memset(&data, 0, sizeof(struct patch_id_t));
4102 data.ctx = &ctx;
4103
4104 for (i = 0; i < q->nr; i++) {
4105 xpparam_t xpp;
4106 xdemitconf_t xecfg;
4107 mmfile_t mf1, mf2;
4108 struct diff_filepair *p = q->queue[i];
4109 int len1, len2;
4110
4111 memset(&xpp, 0, sizeof(xpp));
4112 memset(&xecfg, 0, sizeof(xecfg));
4113 if (p->status == 0)
4114 return error("internal diff status error");
4115 if (p->status == DIFF_STATUS_UNKNOWN)
4116 continue;
4117 if (diff_unmodified_pair(p))
4118 continue;
4119 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4120 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4121 continue;
4122 if (DIFF_PAIR_UNMERGED(p))
4123 continue;
4124
4125 diff_fill_sha1_info(p->one);
4126 diff_fill_sha1_info(p->two);
4127 if (fill_mmfile(&mf1, p->one) < 0 ||
4128 fill_mmfile(&mf2, p->two) < 0)
4129 return error("unable to read files to diff");
4130
4131 len1 = remove_space(p->one->path, strlen(p->one->path));
4132 len2 = remove_space(p->two->path, strlen(p->two->path));
4133 if (p->one->mode == 0)
4134 len1 = snprintf(buffer, sizeof(buffer),
4135 "diff--gita/%.*sb/%.*s"
4136 "newfilemode%06o"
4137 "---/dev/null"
4138 "+++b/%.*s",
4139 len1, p->one->path,
4140 len2, p->two->path,
4141 p->two->mode,
4142 len2, p->two->path);
4143 else if (p->two->mode == 0)
4144 len1 = snprintf(buffer, sizeof(buffer),
4145 "diff--gita/%.*sb/%.*s"
4146 "deletedfilemode%06o"
4147 "---a/%.*s"
4148 "+++/dev/null",
4149 len1, p->one->path,
4150 len2, p->two->path,
4151 p->one->mode,
4152 len1, p->one->path);
4153 else
4154 len1 = snprintf(buffer, sizeof(buffer),
4155 "diff--gita/%.*sb/%.*s"
4156 "---a/%.*s"
4157 "+++b/%.*s",
4158 len1, p->one->path,
4159 len2, p->two->path,
4160 len1, p->one->path,
4161 len2, p->two->path);
4162 git_SHA1_Update(&ctx, buffer, len1);
4163
4164 if (diff_filespec_is_binary(p->one) ||
4165 diff_filespec_is_binary(p->two)) {
4166 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4167 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4168 continue;
4169 }
4170
4171 xpp.flags = 0;
4172 xecfg.ctxlen = 3;
4173 xecfg.flags = 0;
4174 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4175 &xpp, &xecfg);
4176 }
4177
4178 git_SHA1_Final(sha1, &ctx);
4179 return 0;
4180 }
4181
4182 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4183 {
4184 struct diff_queue_struct *q = &diff_queued_diff;
4185 int i;
4186 int result = diff_get_patch_id(options, sha1);
4187
4188 for (i = 0; i < q->nr; i++)
4189 diff_free_filepair(q->queue[i]);
4190
4191 free(q->queue);
4192 DIFF_QUEUE_CLEAR(q);
4193
4194 return result;
4195 }
4196
4197 static int is_summary_empty(const struct diff_queue_struct *q)
4198 {
4199 int i;
4200
4201 for (i = 0; i < q->nr; i++) {
4202 const struct diff_filepair *p = q->queue[i];
4203
4204 switch (p->status) {
4205 case DIFF_STATUS_DELETED:
4206 case DIFF_STATUS_ADDED:
4207 case DIFF_STATUS_COPIED:
4208 case DIFF_STATUS_RENAMED:
4209 return 0;
4210 default:
4211 if (p->score)
4212 return 0;
4213 if (p->one->mode && p->two->mode &&
4214 p->one->mode != p->two->mode)
4215 return 0;
4216 break;
4217 }
4218 }
4219 return 1;
4220 }
4221
4222 static const char rename_limit_warning[] =
4223 "inexact rename detection was skipped due to too many files.";
4224
4225 static const char degrade_cc_to_c_warning[] =
4226 "only found copies from modified paths due to too many files.";
4227
4228 static const char rename_limit_advice[] =
4229 "you may want to set your %s variable to at least "
4230 "%d and retry the command.";
4231
4232 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4233 {
4234 if (degraded_cc)
4235 warning(degrade_cc_to_c_warning);
4236 else if (needed)
4237 warning(rename_limit_warning);
4238 else
4239 return;
4240 if (0 < needed && needed < 32767)
4241 warning(rename_limit_advice, varname, needed);
4242 }
4243
4244 void diff_flush(struct diff_options *options)
4245 {
4246 struct diff_queue_struct *q = &diff_queued_diff;
4247 int i, output_format = options->output_format;
4248 int separator = 0;
4249 int dirstat_by_line = 0;
4250
4251 /*
4252 * Order: raw, stat, summary, patch
4253 * or: name/name-status/checkdiff (other bits clear)
4254 */
4255 if (!q->nr)
4256 goto free_queue;
4257
4258 if (output_format & (DIFF_FORMAT_RAW |
4259 DIFF_FORMAT_NAME |
4260 DIFF_FORMAT_NAME_STATUS |
4261 DIFF_FORMAT_CHECKDIFF)) {
4262 for (i = 0; i < q->nr; i++) {
4263 struct diff_filepair *p = q->queue[i];
4264 if (check_pair_status(p))
4265 flush_one_pair(p, options);
4266 }
4267 separator++;
4268 }
4269
4270 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4271 dirstat_by_line = 1;
4272
4273 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4274 dirstat_by_line) {
4275 struct diffstat_t diffstat;
4276
4277 memset(&diffstat, 0, sizeof(struct diffstat_t));
4278 for (i = 0; i < q->nr; i++) {
4279 struct diff_filepair *p = q->queue[i];
4280 if (check_pair_status(p))
4281 diff_flush_stat(p, options, &diffstat);
4282 }
4283 if (output_format & DIFF_FORMAT_NUMSTAT)
4284 show_numstat(&diffstat, options);
4285 if (output_format & DIFF_FORMAT_DIFFSTAT)
4286 show_stats(&diffstat, options);
4287 if (output_format & DIFF_FORMAT_SHORTSTAT)
4288 show_shortstats(&diffstat, options);
4289 if (output_format & DIFF_FORMAT_DIRSTAT)
4290 show_dirstat_by_line(&diffstat, options);
4291 free_diffstat_info(&diffstat);
4292 separator++;
4293 }
4294 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4295 show_dirstat(options);
4296
4297 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4298 for (i = 0; i < q->nr; i++) {
4299 diff_summary(options, q->queue[i]);
4300 }
4301 separator++;
4302 }
4303
4304 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4305 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4306 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4307 /*
4308 * run diff_flush_patch for the exit status. setting
4309 * options->file to /dev/null should be safe, becaue we
4310 * aren't supposed to produce any output anyway.
4311 */
4312 if (options->close_file)
4313 fclose(options->file);
4314 options->file = fopen("/dev/null", "w");
4315 if (!options->file)
4316 die_errno("Could not open /dev/null");
4317 options->close_file = 1;
4318 for (i = 0; i < q->nr; i++) {
4319 struct diff_filepair *p = q->queue[i];
4320 if (check_pair_status(p))
4321 diff_flush_patch(p, options);
4322 if (options->found_changes)
4323 break;
4324 }
4325 }
4326
4327 if (output_format & DIFF_FORMAT_PATCH) {
4328 if (separator) {
4329 putc(options->line_termination, options->file);
4330 if (options->stat_sep) {
4331 /* attach patch instead of inline */
4332 fputs(options->stat_sep, options->file);
4333 }
4334 }
4335
4336 for (i = 0; i < q->nr; i++) {
4337 struct diff_filepair *p = q->queue[i];
4338 if (check_pair_status(p))
4339 diff_flush_patch(p, options);
4340 }
4341 }
4342
4343 if (output_format & DIFF_FORMAT_CALLBACK)
4344 options->format_callback(q, options, options->format_callback_data);
4345
4346 for (i = 0; i < q->nr; i++)
4347 diff_free_filepair(q->queue[i]);
4348 free_queue:
4349 free(q->queue);
4350 DIFF_QUEUE_CLEAR(q);
4351 if (options->close_file)
4352 fclose(options->file);
4353
4354 /*
4355 * Report the content-level differences with HAS_CHANGES;
4356 * diff_addremove/diff_change does not set the bit when
4357 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4358 */
4359 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4360 if (options->found_changes)
4361 DIFF_OPT_SET(options, HAS_CHANGES);
4362 else
4363 DIFF_OPT_CLR(options, HAS_CHANGES);
4364 }
4365 }
4366
4367 static void diffcore_apply_filter(const char *filter)
4368 {
4369 int i;
4370 struct diff_queue_struct *q = &diff_queued_diff;
4371 struct diff_queue_struct outq;
4372 DIFF_QUEUE_CLEAR(&outq);
4373
4374 if (!filter)
4375 return;
4376
4377 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4378 int found;
4379 for (i = found = 0; !found && i < q->nr; i++) {
4380 struct diff_filepair *p = q->queue[i];
4381 if (((p->status == DIFF_STATUS_MODIFIED) &&
4382 ((p->score &&
4383 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4384 (!p->score &&
4385 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4386 ((p->status != DIFF_STATUS_MODIFIED) &&
4387 strchr(filter, p->status)))
4388 found++;
4389 }
4390 if (found)
4391 return;
4392
4393 /* otherwise we will clear the whole queue
4394 * by copying the empty outq at the end of this
4395 * function, but first clear the current entries
4396 * in the queue.
4397 */
4398 for (i = 0; i < q->nr; i++)
4399 diff_free_filepair(q->queue[i]);
4400 }
4401 else {
4402 /* Only the matching ones */
4403 for (i = 0; i < q->nr; i++) {
4404 struct diff_filepair *p = q->queue[i];
4405
4406 if (((p->status == DIFF_STATUS_MODIFIED) &&
4407 ((p->score &&
4408 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4409 (!p->score &&
4410 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4411 ((p->status != DIFF_STATUS_MODIFIED) &&
4412 strchr(filter, p->status)))
4413 diff_q(&outq, p);
4414 else
4415 diff_free_filepair(p);
4416 }
4417 }
4418 free(q->queue);
4419 *q = outq;
4420 }
4421
4422 /* Check whether two filespecs with the same mode and size are identical */
4423 static int diff_filespec_is_identical(struct diff_filespec *one,
4424 struct diff_filespec *two)
4425 {
4426 if (S_ISGITLINK(one->mode))
4427 return 0;
4428 if (diff_populate_filespec(one, 0))
4429 return 0;
4430 if (diff_populate_filespec(two, 0))
4431 return 0;
4432 return !memcmp(one->data, two->data, one->size);
4433 }
4434
4435 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4436 {
4437 int i;
4438 struct diff_queue_struct *q = &diff_queued_diff;
4439 struct diff_queue_struct outq;
4440 DIFF_QUEUE_CLEAR(&outq);
4441
4442 for (i = 0; i < q->nr; i++) {
4443 struct diff_filepair *p = q->queue[i];
4444
4445 /*
4446 * 1. Entries that come from stat info dirtiness
4447 * always have both sides (iow, not create/delete),
4448 * one side of the object name is unknown, with
4449 * the same mode and size. Keep the ones that
4450 * do not match these criteria. They have real
4451 * differences.
4452 *
4453 * 2. At this point, the file is known to be modified,
4454 * with the same mode and size, and the object
4455 * name of one side is unknown. Need to inspect
4456 * the identical contents.
4457 */
4458 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4459 !DIFF_FILE_VALID(p->two) ||
4460 (p->one->sha1_valid && p->two->sha1_valid) ||
4461 (p->one->mode != p->two->mode) ||
4462 diff_populate_filespec(p->one, 1) ||
4463 diff_populate_filespec(p->two, 1) ||
4464 (p->one->size != p->two->size) ||
4465 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4466 diff_q(&outq, p);
4467 else {
4468 /*
4469 * The caller can subtract 1 from skip_stat_unmatch
4470 * to determine how many paths were dirty only
4471 * due to stat info mismatch.
4472 */
4473 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4474 diffopt->skip_stat_unmatch++;
4475 diff_free_filepair(p);
4476 }
4477 }
4478 free(q->queue);
4479 *q = outq;
4480 }
4481
4482 static int diffnamecmp(const void *a_, const void *b_)
4483 {
4484 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4485 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4486 const char *name_a, *name_b;
4487
4488 name_a = a->one ? a->one->path : a->two->path;
4489 name_b = b->one ? b->one->path : b->two->path;
4490 return strcmp(name_a, name_b);
4491 }
4492
4493 void diffcore_fix_diff_index(struct diff_options *options)
4494 {
4495 struct diff_queue_struct *q = &diff_queued_diff;
4496 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4497 }
4498
4499 void diffcore_std(struct diff_options *options)
4500 {
4501 if (options->skip_stat_unmatch)
4502 diffcore_skip_stat_unmatch(options);
4503 if (!options->found_follow) {
4504 /* See try_to_follow_renames() in tree-diff.c */
4505 if (options->break_opt != -1)
4506 diffcore_break(options->break_opt);
4507 if (options->detect_rename)
4508 diffcore_rename(options);
4509 if (options->break_opt != -1)
4510 diffcore_merge_broken();
4511 }
4512 if (options->pickaxe)
4513 diffcore_pickaxe(options);
4514 if (options->orderfile)
4515 diffcore_order(options->orderfile);
4516 if (!options->found_follow)
4517 /* See try_to_follow_renames() in tree-diff.c */
4518 diff_resolve_rename_copy();
4519 diffcore_apply_filter(options->filter);
4520
4521 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4522 DIFF_OPT_SET(options, HAS_CHANGES);
4523 else
4524 DIFF_OPT_CLR(options, HAS_CHANGES);
4525
4526 options->found_follow = 0;
4527 }
4528
4529 int diff_result_code(struct diff_options *opt, int status)
4530 {
4531 int result = 0;
4532
4533 diff_warn_rename_limit("diff.renamelimit",
4534 opt->needed_rename_limit,
4535 opt->degraded_cc_to_c);
4536 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4537 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4538 return status;
4539 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4540 DIFF_OPT_TST(opt, HAS_CHANGES))
4541 result |= 01;
4542 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4543 DIFF_OPT_TST(opt, CHECK_FAILED))
4544 result |= 02;
4545 return result;
4546 }
4547
4548 int diff_can_quit_early(struct diff_options *opt)
4549 {
4550 return (DIFF_OPT_TST(opt, QUICK) &&
4551 !opt->filter &&
4552 DIFF_OPT_TST(opt, HAS_CHANGES));
4553 }
4554
4555 /*
4556 * Shall changes to this submodule be ignored?
4557 *
4558 * Submodule changes can be configured to be ignored separately for each path,
4559 * but that configuration can be overridden from the command line.
4560 */
4561 static int is_submodule_ignored(const char *path, struct diff_options *options)
4562 {
4563 int ignored = 0;
4564 unsigned orig_flags = options->flags;
4565 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4566 set_diffopt_flags_from_submodule_config(options, path);
4567 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4568 ignored = 1;
4569 options->flags = orig_flags;
4570 return ignored;
4571 }
4572
4573 void diff_addremove(struct diff_options *options,
4574 int addremove, unsigned mode,
4575 const unsigned char *sha1,
4576 const char *concatpath, unsigned dirty_submodule)
4577 {
4578 struct diff_filespec *one, *two;
4579
4580 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4581 return;
4582
4583 /* This may look odd, but it is a preparation for
4584 * feeding "there are unchanged files which should
4585 * not produce diffs, but when you are doing copy
4586 * detection you would need them, so here they are"
4587 * entries to the diff-core. They will be prefixed
4588 * with something like '=' or '*' (I haven't decided
4589 * which but should not make any difference).
4590 * Feeding the same new and old to diff_change()
4591 * also has the same effect.
4592 * Before the final output happens, they are pruned after
4593 * merged into rename/copy pairs as appropriate.
4594 */
4595 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4596 addremove = (addremove == '+' ? '-' :
4597 addremove == '-' ? '+' : addremove);
4598
4599 if (options->prefix &&
4600 strncmp(concatpath, options->prefix, options->prefix_length))
4601 return;
4602
4603 one = alloc_filespec(concatpath);
4604 two = alloc_filespec(concatpath);
4605
4606 if (addremove != '+')
4607 fill_filespec(one, sha1, mode);
4608 if (addremove != '-') {
4609 fill_filespec(two, sha1, mode);
4610 two->dirty_submodule = dirty_submodule;
4611 }
4612
4613 diff_queue(&diff_queued_diff, one, two);
4614 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4615 DIFF_OPT_SET(options, HAS_CHANGES);
4616 }
4617
4618 void diff_change(struct diff_options *options,
4619 unsigned old_mode, unsigned new_mode,
4620 const unsigned char *old_sha1,
4621 const unsigned char *new_sha1,
4622 const char *concatpath,
4623 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4624 {
4625 struct diff_filespec *one, *two;
4626
4627 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4628 is_submodule_ignored(concatpath, options))
4629 return;
4630
4631 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4632 unsigned tmp;
4633 const unsigned char *tmp_c;
4634 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4635 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4636 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4637 new_dirty_submodule = tmp;
4638 }
4639
4640 if (options->prefix &&
4641 strncmp(concatpath, options->prefix, options->prefix_length))
4642 return;
4643
4644 one = alloc_filespec(concatpath);
4645 two = alloc_filespec(concatpath);
4646 fill_filespec(one, old_sha1, old_mode);
4647 fill_filespec(two, new_sha1, new_mode);
4648 one->dirty_submodule = old_dirty_submodule;
4649 two->dirty_submodule = new_dirty_submodule;
4650
4651 diff_queue(&diff_queued_diff, one, two);
4652 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4653 DIFF_OPT_SET(options, HAS_CHANGES);
4654 }
4655
4656 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4657 {
4658 struct diff_filepair *pair;
4659 struct diff_filespec *one, *two;
4660
4661 if (options->prefix &&
4662 strncmp(path, options->prefix, options->prefix_length))
4663 return NULL;
4664
4665 one = alloc_filespec(path);
4666 two = alloc_filespec(path);
4667 pair = diff_queue(&diff_queued_diff, one, two);
4668 pair->is_unmerged = 1;
4669 return pair;
4670 }
4671
4672 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4673 size_t *outsize)
4674 {
4675 struct diff_tempfile *temp;
4676 const char *argv[3];
4677 const char **arg = argv;
4678 struct child_process child;
4679 struct strbuf buf = STRBUF_INIT;
4680 int err = 0;
4681
4682 temp = prepare_temp_file(spec->path, spec);
4683 *arg++ = pgm;
4684 *arg++ = temp->name;
4685 *arg = NULL;
4686
4687 memset(&child, 0, sizeof(child));
4688 child.use_shell = 1;
4689 child.argv = argv;
4690 child.out = -1;
4691 if (start_command(&child)) {
4692 remove_tempfile();
4693 return NULL;
4694 }
4695
4696 if (strbuf_read(&buf, child.out, 0) < 0)
4697 err = error("error reading from textconv command '%s'", pgm);
4698 close(child.out);
4699
4700 if (finish_command(&child) || err) {
4701 strbuf_release(&buf);
4702 remove_tempfile();
4703 return NULL;
4704 }
4705 remove_tempfile();
4706
4707 return strbuf_detach(&buf, outsize);
4708 }
4709
4710 size_t fill_textconv(struct userdiff_driver *driver,
4711 struct diff_filespec *df,
4712 char **outbuf)
4713 {
4714 size_t size;
4715
4716 if (!driver || !driver->textconv) {
4717 if (!DIFF_FILE_VALID(df)) {
4718 *outbuf = "";
4719 return 0;
4720 }
4721 if (diff_populate_filespec(df, 0))
4722 die("unable to read files to diff");
4723 *outbuf = df->data;
4724 return df->size;
4725 }
4726
4727 if (driver->textconv_cache && df->sha1_valid) {
4728 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4729 &size);
4730 if (*outbuf)
4731 return size;
4732 }
4733
4734 *outbuf = run_textconv(driver->textconv, df, &size);
4735 if (!*outbuf)
4736 die("unable to read files to diff");
4737
4738 if (driver->textconv_cache && df->sha1_valid) {
4739 /* ignore errors, as we might be in a readonly repository */
4740 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4741 size);
4742 /*
4743 * we could save up changes and flush them all at the end,
4744 * but we would need an extra call after all diffing is done.
4745 * Since generating a cache entry is the slow path anyway,
4746 * this extra overhead probably isn't a big deal.
4747 */
4748 notes_cache_write(driver->textconv_cache);
4749 }
4750
4751 return size;
4752 }
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