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Merge branch 'tg/tag-points-at'
[git/jrn.git] / diff.c
bloba1c06b554b80e433dcb735c8e0adf186b6252ae5
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 if (!it)
1277 return 0;
1278 /*
1279 * make sure that at least one '-' or '+' is printed if
1280 * there is any change to this path. The easiest way is to
1281 * scale linearly as if the alloted width is one column shorter
1282 * than it is, and then add 1 to the result.
1283 */
1284 return 1 + (it * (width - 1) / max_change);
1285 }
1286
1287 static void show_name(FILE *file,
1288 const char *prefix, const char *name, int len)
1289 {
1290 fprintf(file, " %s%-*s |", prefix, len, name);
1291 }
1292
1293 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1294 {
1295 if (cnt <= 0)
1296 return;
1297 fprintf(file, "%s", set);
1298 while (cnt--)
1299 putc(ch, file);
1300 fprintf(file, "%s", reset);
1301 }
1302
1303 static void fill_print_name(struct diffstat_file *file)
1304 {
1305 char *pname;
1306
1307 if (file->print_name)
1308 return;
1309
1310 if (!file->is_renamed) {
1311 struct strbuf buf = STRBUF_INIT;
1312 if (quote_c_style(file->name, &buf, NULL, 0)) {
1313 pname = strbuf_detach(&buf, NULL);
1314 } else {
1315 pname = file->name;
1316 strbuf_release(&buf);
1317 }
1318 } else {
1319 pname = pprint_rename(file->from_name, file->name);
1320 }
1321 file->print_name = pname;
1322 }
1323
1324 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1325 {
1326 struct strbuf sb = STRBUF_INIT;
1327 int ret;
1328
1329 if (!files) {
1330 assert(insertions == 0 && deletions == 0);
1331 return fputs(_(" 0 files changed\n"), fp);
1332 }
1333
1334 strbuf_addf(&sb,
1335 Q_(" %d file changed", " %d files changed", files),
1336 files);
1337
1338 /*
1339 * For binary diff, the caller may want to print "x files
1340 * changed" with insertions == 0 && deletions == 0.
1341 *
1342 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1343 * is probably less confusing (i.e skip over "2 files changed
1344 * but nothing about added/removed lines? Is this a bug in Git?").
1345 */
1346 if (insertions || deletions == 0) {
1347 /*
1348 * TRANSLATORS: "+" in (+) is a line addition marker;
1349 * do not translate it.
1350 */
1351 strbuf_addf(&sb,
1352 Q_(", %d insertion(+)", ", %d insertions(+)",
1353 insertions),
1354 insertions);
1355 }
1356
1357 if (deletions || insertions == 0) {
1358 /*
1359 * TRANSLATORS: "-" in (-) is a line removal marker;
1360 * do not translate it.
1361 */
1362 strbuf_addf(&sb,
1363 Q_(", %d deletion(-)", ", %d deletions(-)",
1364 deletions),
1365 deletions);
1366 }
1367 strbuf_addch(&sb, '\n');
1368 ret = fputs(sb.buf, fp);
1369 strbuf_release(&sb);
1370 return ret;
1371 }
1372
1373 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1374 {
1375 int i, len, add, del, adds = 0, dels = 0;
1376 uintmax_t max_change = 0, max_len = 0;
1377 int total_files = data->nr;
1378 int width, name_width, count;
1379 const char *reset, *add_c, *del_c;
1380 const char *line_prefix = "";
1381 int extra_shown = 0;
1382 struct strbuf *msg = NULL;
1383
1384 if (data->nr == 0)
1385 return;
1386
1387 if (options->output_prefix) {
1388 msg = options->output_prefix(options, options->output_prefix_data);
1389 line_prefix = msg->buf;
1390 }
1391
1392 width = options->stat_width ? options->stat_width : 80;
1393 name_width = options->stat_name_width ? options->stat_name_width : 50;
1394 count = options->stat_count ? options->stat_count : data->nr;
1395
1396 /* Sanity: give at least 5 columns to the graph,
1397 * but leave at least 10 columns for the name.
1398 */
1399 if (width < 25)
1400 width = 25;
1401 if (name_width < 10)
1402 name_width = 10;
1403 else if (width < name_width + 15)
1404 name_width = width - 15;
1405
1406 /* Find the longest filename and max number of changes */
1407 reset = diff_get_color_opt(options, DIFF_RESET);
1408 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1409 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1410
1411 for (i = 0; (i < count) && (i < data->nr); i++) {
1412 struct diffstat_file *file = data->files[i];
1413 uintmax_t change = file->added + file->deleted;
1414 if (!data->files[i]->is_renamed &&
1415 (change == 0)) {
1416 count++; /* not shown == room for one more */
1417 continue;
1418 }
1419 fill_print_name(file);
1420 len = strlen(file->print_name);
1421 if (max_len < len)
1422 max_len = len;
1423
1424 if (file->is_binary || file->is_unmerged)
1425 continue;
1426 if (max_change < change)
1427 max_change = change;
1428 }
1429 count = i; /* min(count, data->nr) */
1430
1431 /* Compute the width of the graph part;
1432 * 10 is for one blank at the beginning of the line plus
1433 * " | count " between the name and the graph.
1434 *
1435 * From here on, name_width is the width of the name area,
1436 * and width is the width of the graph area.
1437 */
1438 name_width = (name_width < max_len) ? name_width : max_len;
1439 if (width < (name_width + 10) + max_change)
1440 width = width - (name_width + 10);
1441 else
1442 width = max_change;
1443
1444 for (i = 0; i < count; i++) {
1445 const char *prefix = "";
1446 char *name = data->files[i]->print_name;
1447 uintmax_t added = data->files[i]->added;
1448 uintmax_t deleted = data->files[i]->deleted;
1449 int name_len;
1450
1451 if (!data->files[i]->is_renamed &&
1452 (added + deleted == 0)) {
1453 total_files--;
1454 continue;
1455 }
1456 /*
1457 * "scale" the filename
1458 */
1459 len = name_width;
1460 name_len = strlen(name);
1461 if (name_width < name_len) {
1462 char *slash;
1463 prefix = "...";
1464 len -= 3;
1465 name += name_len - len;
1466 slash = strchr(name, '/');
1467 if (slash)
1468 name = slash;
1469 }
1470
1471 if (data->files[i]->is_binary) {
1472 fprintf(options->file, "%s", line_prefix);
1473 show_name(options->file, prefix, name, len);
1474 fprintf(options->file, " Bin ");
1475 fprintf(options->file, "%s%"PRIuMAX"%s",
1476 del_c, deleted, reset);
1477 fprintf(options->file, " -> ");
1478 fprintf(options->file, "%s%"PRIuMAX"%s",
1479 add_c, added, reset);
1480 fprintf(options->file, " bytes");
1481 fprintf(options->file, "\n");
1482 continue;
1483 }
1484 else if (data->files[i]->is_unmerged) {
1485 fprintf(options->file, "%s", line_prefix);
1486 show_name(options->file, prefix, name, len);
1487 fprintf(options->file, " Unmerged\n");
1488 continue;
1489 }
1490
1491 /*
1492 * scale the add/delete
1493 */
1494 add = added;
1495 del = deleted;
1496 adds += add;
1497 dels += del;
1498
1499 if (width <= max_change) {
1500 int total = add + del;
1501
1502 total = scale_linear(add + del, width, max_change);
1503 if (total < 2 && add && del)
1504 /* width >= 2 due to the sanity check */
1505 total = 2;
1506 if (add < del) {
1507 add = scale_linear(add, width, max_change);
1508 del = total - add;
1509 } else {
1510 del = scale_linear(del, width, max_change);
1511 add = total - del;
1512 }
1513 }
1514 fprintf(options->file, "%s", line_prefix);
1515 show_name(options->file, prefix, name, len);
1516 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1517 added + deleted ? " " : "");
1518 show_graph(options->file, '+', add, add_c, reset);
1519 show_graph(options->file, '-', del, del_c, reset);
1520 fprintf(options->file, "\n");
1521 }
1522 for (i = count; i < data->nr; i++) {
1523 uintmax_t added = data->files[i]->added;
1524 uintmax_t deleted = data->files[i]->deleted;
1525 if (!data->files[i]->is_renamed &&
1526 (added + deleted == 0)) {
1527 total_files--;
1528 continue;
1529 }
1530 adds += added;
1531 dels += deleted;
1532 if (!extra_shown)
1533 fprintf(options->file, "%s ...\n", line_prefix);
1534 extra_shown = 1;
1535 }
1536 fprintf(options->file, "%s", line_prefix);
1537 print_stat_summary(options->file, total_files, adds, dels);
1538 }
1539
1540 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1541 {
1542 int i, adds = 0, dels = 0, total_files = data->nr;
1543
1544 if (data->nr == 0)
1545 return;
1546
1547 for (i = 0; i < data->nr; i++) {
1548 if (!data->files[i]->is_binary &&
1549 !data->files[i]->is_unmerged) {
1550 int added = data->files[i]->added;
1551 int deleted= data->files[i]->deleted;
1552 if (!data->files[i]->is_renamed &&
1553 (added + deleted == 0)) {
1554 total_files--;
1555 } else {
1556 adds += added;
1557 dels += deleted;
1558 }
1559 }
1560 }
1561 if (options->output_prefix) {
1562 struct strbuf *msg = NULL;
1563 msg = options->output_prefix(options,
1564 options->output_prefix_data);
1565 fprintf(options->file, "%s", msg->buf);
1566 }
1567 print_stat_summary(options->file, total_files, adds, dels);
1568 }
1569
1570 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1571 {
1572 int i;
1573
1574 if (data->nr == 0)
1575 return;
1576
1577 for (i = 0; i < data->nr; i++) {
1578 struct diffstat_file *file = data->files[i];
1579
1580 if (options->output_prefix) {
1581 struct strbuf *msg = NULL;
1582 msg = options->output_prefix(options,
1583 options->output_prefix_data);
1584 fprintf(options->file, "%s", msg->buf);
1585 }
1586
1587 if (file->is_binary)
1588 fprintf(options->file, "-\t-\t");
1589 else
1590 fprintf(options->file,
1591 "%"PRIuMAX"\t%"PRIuMAX"\t",
1592 file->added, file->deleted);
1593 if (options->line_termination) {
1594 fill_print_name(file);
1595 if (!file->is_renamed)
1596 write_name_quoted(file->name, options->file,
1597 options->line_termination);
1598 else {
1599 fputs(file->print_name, options->file);
1600 putc(options->line_termination, options->file);
1601 }
1602 } else {
1603 if (file->is_renamed) {
1604 putc('\0', options->file);
1605 write_name_quoted(file->from_name, options->file, '\0');
1606 }
1607 write_name_quoted(file->name, options->file, '\0');
1608 }
1609 }
1610 }
1611
1612 struct dirstat_file {
1613 const char *name;
1614 unsigned long changed;
1615 };
1616
1617 struct dirstat_dir {
1618 struct dirstat_file *files;
1619 int alloc, nr, permille, cumulative;
1620 };
1621
1622 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1623 unsigned long changed, const char *base, int baselen)
1624 {
1625 unsigned long this_dir = 0;
1626 unsigned int sources = 0;
1627 const char *line_prefix = "";
1628 struct strbuf *msg = NULL;
1629
1630 if (opt->output_prefix) {
1631 msg = opt->output_prefix(opt, opt->output_prefix_data);
1632 line_prefix = msg->buf;
1633 }
1634
1635 while (dir->nr) {
1636 struct dirstat_file *f = dir->files;
1637 int namelen = strlen(f->name);
1638 unsigned long this;
1639 char *slash;
1640
1641 if (namelen < baselen)
1642 break;
1643 if (memcmp(f->name, base, baselen))
1644 break;
1645 slash = strchr(f->name + baselen, '/');
1646 if (slash) {
1647 int newbaselen = slash + 1 - f->name;
1648 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1649 sources++;
1650 } else {
1651 this = f->changed;
1652 dir->files++;
1653 dir->nr--;
1654 sources += 2;
1655 }
1656 this_dir += this;
1657 }
1658
1659 /*
1660 * We don't report dirstat's for
1661 * - the top level
1662 * - or cases where everything came from a single directory
1663 * under this directory (sources == 1).
1664 */
1665 if (baselen && sources != 1) {
1666 if (this_dir) {
1667 int permille = this_dir * 1000 / changed;
1668 if (permille >= dir->permille) {
1669 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1670 permille / 10, permille % 10, baselen, base);
1671 if (!dir->cumulative)
1672 return 0;
1673 }
1674 }
1675 }
1676 return this_dir;
1677 }
1678
1679 static int dirstat_compare(const void *_a, const void *_b)
1680 {
1681 const struct dirstat_file *a = _a;
1682 const struct dirstat_file *b = _b;
1683 return strcmp(a->name, b->name);
1684 }
1685
1686 static void show_dirstat(struct diff_options *options)
1687 {
1688 int i;
1689 unsigned long changed;
1690 struct dirstat_dir dir;
1691 struct diff_queue_struct *q = &diff_queued_diff;
1692
1693 dir.files = NULL;
1694 dir.alloc = 0;
1695 dir.nr = 0;
1696 dir.permille = options->dirstat_permille;
1697 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1698
1699 changed = 0;
1700 for (i = 0; i < q->nr; i++) {
1701 struct diff_filepair *p = q->queue[i];
1702 const char *name;
1703 unsigned long copied, added, damage;
1704 int content_changed;
1705
1706 name = p->two->path ? p->two->path : p->one->path;
1707
1708 if (p->one->sha1_valid && p->two->sha1_valid)
1709 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1710 else
1711 content_changed = 1;
1712
1713 if (!content_changed) {
1714 /*
1715 * The SHA1 has not changed, so pre-/post-content is
1716 * identical. We can therefore skip looking at the
1717 * file contents altogether.
1718 */
1719 damage = 0;
1720 goto found_damage;
1721 }
1722
1723 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1724 /*
1725 * In --dirstat-by-file mode, we don't really need to
1726 * look at the actual file contents at all.
1727 * The fact that the SHA1 changed is enough for us to
1728 * add this file to the list of results
1729 * (with each file contributing equal damage).
1730 */
1731 damage = 1;
1732 goto found_damage;
1733 }
1734
1735 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1736 diff_populate_filespec(p->one, 0);
1737 diff_populate_filespec(p->two, 0);
1738 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1739 &copied, &added);
1740 diff_free_filespec_data(p->one);
1741 diff_free_filespec_data(p->two);
1742 } else if (DIFF_FILE_VALID(p->one)) {
1743 diff_populate_filespec(p->one, 1);
1744 copied = added = 0;
1745 diff_free_filespec_data(p->one);
1746 } else if (DIFF_FILE_VALID(p->two)) {
1747 diff_populate_filespec(p->two, 1);
1748 copied = 0;
1749 added = p->two->size;
1750 diff_free_filespec_data(p->two);
1751 } else
1752 continue;
1753
1754 /*
1755 * Original minus copied is the removed material,
1756 * added is the new material. They are both damages
1757 * made to the preimage.
1758 * If the resulting damage is zero, we know that
1759 * diffcore_count_changes() considers the two entries to
1760 * be identical, but since content_changed is true, we
1761 * know that there must have been _some_ kind of change,
1762 * so we force all entries to have damage > 0.
1763 */
1764 damage = (p->one->size - copied) + added;
1765 if (!damage)
1766 damage = 1;
1767
1768 found_damage:
1769 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1770 dir.files[dir.nr].name = name;
1771 dir.files[dir.nr].changed = damage;
1772 changed += damage;
1773 dir.nr++;
1774 }
1775
1776 /* This can happen even with many files, if everything was renames */
1777 if (!changed)
1778 return;
1779
1780 /* Show all directories with more than x% of the changes */
1781 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1782 gather_dirstat(options, &dir, changed, "", 0);
1783 }
1784
1785 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1786 {
1787 int i;
1788 unsigned long changed;
1789 struct dirstat_dir dir;
1790
1791 if (data->nr == 0)
1792 return;
1793
1794 dir.files = NULL;
1795 dir.alloc = 0;
1796 dir.nr = 0;
1797 dir.permille = options->dirstat_permille;
1798 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1799
1800 changed = 0;
1801 for (i = 0; i < data->nr; i++) {
1802 struct diffstat_file *file = data->files[i];
1803 unsigned long damage = file->added + file->deleted;
1804 if (file->is_binary)
1805 /*
1806 * binary files counts bytes, not lines. Must find some
1807 * way to normalize binary bytes vs. textual lines.
1808 * The following heuristic assumes that there are 64
1809 * bytes per "line".
1810 * This is stupid and ugly, but very cheap...
1811 */
1812 damage = (damage + 63) / 64;
1813 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1814 dir.files[dir.nr].name = file->name;
1815 dir.files[dir.nr].changed = damage;
1816 changed += damage;
1817 dir.nr++;
1818 }
1819
1820 /* This can happen even with many files, if everything was renames */
1821 if (!changed)
1822 return;
1823
1824 /* Show all directories with more than x% of the changes */
1825 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1826 gather_dirstat(options, &dir, changed, "", 0);
1827 }
1828
1829 static void free_diffstat_info(struct diffstat_t *diffstat)
1830 {
1831 int i;
1832 for (i = 0; i < diffstat->nr; i++) {
1833 struct diffstat_file *f = diffstat->files[i];
1834 if (f->name != f->print_name)
1835 free(f->print_name);
1836 free(f->name);
1837 free(f->from_name);
1838 free(f);
1839 }
1840 free(diffstat->files);
1841 }
1842
1843 struct checkdiff_t {
1844 const char *filename;
1845 int lineno;
1846 int conflict_marker_size;
1847 struct diff_options *o;
1848 unsigned ws_rule;
1849 unsigned status;
1850 };
1851
1852 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1853 {
1854 char firstchar;
1855 int cnt;
1856
1857 if (len < marker_size + 1)
1858 return 0;
1859 firstchar = line[0];
1860 switch (firstchar) {
1861 case '=': case '>': case '<': case '|':
1862 break;
1863 default:
1864 return 0;
1865 }
1866 for (cnt = 1; cnt < marker_size; cnt++)
1867 if (line[cnt] != firstchar)
1868 return 0;
1869 /* line[1] thru line[marker_size-1] are same as firstchar */
1870 if (len < marker_size + 1 || !isspace(line[marker_size]))
1871 return 0;
1872 return 1;
1873 }
1874
1875 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1876 {
1877 struct checkdiff_t *data = priv;
1878 int marker_size = data->conflict_marker_size;
1879 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1880 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1881 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1882 char *err;
1883 char *line_prefix = "";
1884 struct strbuf *msgbuf;
1885
1886 assert(data->o);
1887 if (data->o->output_prefix) {
1888 msgbuf = data->o->output_prefix(data->o,
1889 data->o->output_prefix_data);
1890 line_prefix = msgbuf->buf;
1891 }
1892
1893 if (line[0] == '+') {
1894 unsigned bad;
1895 data->lineno++;
1896 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1897 data->status |= 1;
1898 fprintf(data->o->file,
1899 "%s%s:%d: leftover conflict marker\n",
1900 line_prefix, data->filename, data->lineno);
1901 }
1902 bad = ws_check(line + 1, len - 1, data->ws_rule);
1903 if (!bad)
1904 return;
1905 data->status |= bad;
1906 err = whitespace_error_string(bad);
1907 fprintf(data->o->file, "%s%s:%d: %s.\n",
1908 line_prefix, data->filename, data->lineno, err);
1909 free(err);
1910 emit_line(data->o, set, reset, line, 1);
1911 ws_check_emit(line + 1, len - 1, data->ws_rule,
1912 data->o->file, set, reset, ws);
1913 } else if (line[0] == ' ') {
1914 data->lineno++;
1915 } else if (line[0] == '@') {
1916 char *plus = strchr(line, '+');
1917 if (plus)
1918 data->lineno = strtol(plus, NULL, 10) - 1;
1919 else
1920 die("invalid diff");
1921 }
1922 }
1923
1924 static unsigned char *deflate_it(char *data,
1925 unsigned long size,
1926 unsigned long *result_size)
1927 {
1928 int bound;
1929 unsigned char *deflated;
1930 git_zstream stream;
1931
1932 memset(&stream, 0, sizeof(stream));
1933 git_deflate_init(&stream, zlib_compression_level);
1934 bound = git_deflate_bound(&stream, size);
1935 deflated = xmalloc(bound);
1936 stream.next_out = deflated;
1937 stream.avail_out = bound;
1938
1939 stream.next_in = (unsigned char *)data;
1940 stream.avail_in = size;
1941 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1942 ; /* nothing */
1943 git_deflate_end(&stream);
1944 *result_size = stream.total_out;
1945 return deflated;
1946 }
1947
1948 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1949 {
1950 void *cp;
1951 void *delta;
1952 void *deflated;
1953 void *data;
1954 unsigned long orig_size;
1955 unsigned long delta_size;
1956 unsigned long deflate_size;
1957 unsigned long data_size;
1958
1959 /* We could do deflated delta, or we could do just deflated two,
1960 * whichever is smaller.
1961 */
1962 delta = NULL;
1963 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1964 if (one->size && two->size) {
1965 delta = diff_delta(one->ptr, one->size,
1966 two->ptr, two->size,
1967 &delta_size, deflate_size);
1968 if (delta) {
1969 void *to_free = delta;
1970 orig_size = delta_size;
1971 delta = deflate_it(delta, delta_size, &delta_size);
1972 free(to_free);
1973 }
1974 }
1975
1976 if (delta && delta_size < deflate_size) {
1977 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1978 free(deflated);
1979 data = delta;
1980 data_size = delta_size;
1981 }
1982 else {
1983 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1984 free(delta);
1985 data = deflated;
1986 data_size = deflate_size;
1987 }
1988
1989 /* emit data encoded in base85 */
1990 cp = data;
1991 while (data_size) {
1992 int bytes = (52 < data_size) ? 52 : data_size;
1993 char line[70];
1994 data_size -= bytes;
1995 if (bytes <= 26)
1996 line[0] = bytes + 'A' - 1;
1997 else
1998 line[0] = bytes - 26 + 'a' - 1;
1999 encode_85(line + 1, cp, bytes);
2000 cp = (char *) cp + bytes;
2001 fprintf(file, "%s", prefix);
2002 fputs(line, file);
2003 fputc('\n', file);
2004 }
2005 fprintf(file, "%s\n", prefix);
2006 free(data);
2007 }
2008
2009 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2010 {
2011 fprintf(file, "%sGIT binary patch\n", prefix);
2012 emit_binary_diff_body(file, one, two, prefix);
2013 emit_binary_diff_body(file, two, one, prefix);
2014 }
2015
2016 static void diff_filespec_load_driver(struct diff_filespec *one)
2017 {
2018 /* Use already-loaded driver */
2019 if (one->driver)
2020 return;
2021
2022 if (S_ISREG(one->mode))
2023 one->driver = userdiff_find_by_path(one->path);
2024
2025 /* Fallback to default settings */
2026 if (!one->driver)
2027 one->driver = userdiff_find_by_name("default");
2028 }
2029
2030 int diff_filespec_is_binary(struct diff_filespec *one)
2031 {
2032 if (one->is_binary == -1) {
2033 diff_filespec_load_driver(one);
2034 if (one->driver->binary != -1)
2035 one->is_binary = one->driver->binary;
2036 else {
2037 if (!one->data && DIFF_FILE_VALID(one))
2038 diff_populate_filespec(one, 0);
2039 if (one->data)
2040 one->is_binary = buffer_is_binary(one->data,
2041 one->size);
2042 if (one->is_binary == -1)
2043 one->is_binary = 0;
2044 }
2045 }
2046 return one->is_binary;
2047 }
2048
2049 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2050 {
2051 diff_filespec_load_driver(one);
2052 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2053 }
2054
2055 static const char *userdiff_word_regex(struct diff_filespec *one)
2056 {
2057 diff_filespec_load_driver(one);
2058 return one->driver->word_regex;
2059 }
2060
2061 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2062 {
2063 if (!options->a_prefix)
2064 options->a_prefix = a;
2065 if (!options->b_prefix)
2066 options->b_prefix = b;
2067 }
2068
2069 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2070 {
2071 if (!DIFF_FILE_VALID(one))
2072 return NULL;
2073
2074 diff_filespec_load_driver(one);
2075 return userdiff_get_textconv(one->driver);
2076 }
2077
2078 static void builtin_diff(const char *name_a,
2079 const char *name_b,
2080 struct diff_filespec *one,
2081 struct diff_filespec *two,
2082 const char *xfrm_msg,
2083 int must_show_header,
2084 struct diff_options *o,
2085 int complete_rewrite)
2086 {
2087 mmfile_t mf1, mf2;
2088 const char *lbl[2];
2089 char *a_one, *b_two;
2090 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2091 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2092 const char *a_prefix, *b_prefix;
2093 struct userdiff_driver *textconv_one = NULL;
2094 struct userdiff_driver *textconv_two = NULL;
2095 struct strbuf header = STRBUF_INIT;
2096 struct strbuf *msgbuf;
2097 char *line_prefix = "";
2098
2099 if (o->output_prefix) {
2100 msgbuf = o->output_prefix(o, o->output_prefix_data);
2101 line_prefix = msgbuf->buf;
2102 }
2103
2104 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2105 (!one->mode || S_ISGITLINK(one->mode)) &&
2106 (!two->mode || S_ISGITLINK(two->mode))) {
2107 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2108 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2109 show_submodule_summary(o->file, one ? one->path : two->path,
2110 one->sha1, two->sha1, two->dirty_submodule,
2111 del, add, reset);
2112 return;
2113 }
2114
2115 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2116 textconv_one = get_textconv(one);
2117 textconv_two = get_textconv(two);
2118 }
2119
2120 diff_set_mnemonic_prefix(o, "a/", "b/");
2121 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2122 a_prefix = o->b_prefix;
2123 b_prefix = o->a_prefix;
2124 } else {
2125 a_prefix = o->a_prefix;
2126 b_prefix = o->b_prefix;
2127 }
2128
2129 /* Never use a non-valid filename anywhere if at all possible */
2130 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2131 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2132
2133 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2134 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2135 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2136 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2137 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2138 if (lbl[0][0] == '/') {
2139 /* /dev/null */
2140 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2141 if (xfrm_msg)
2142 strbuf_addstr(&header, xfrm_msg);
2143 must_show_header = 1;
2144 }
2145 else if (lbl[1][0] == '/') {
2146 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2147 if (xfrm_msg)
2148 strbuf_addstr(&header, xfrm_msg);
2149 must_show_header = 1;
2150 }
2151 else {
2152 if (one->mode != two->mode) {
2153 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2154 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2155 must_show_header = 1;
2156 }
2157 if (xfrm_msg)
2158 strbuf_addstr(&header, xfrm_msg);
2159
2160 /*
2161 * we do not run diff between different kind
2162 * of objects.
2163 */
2164 if ((one->mode ^ two->mode) & S_IFMT)
2165 goto free_ab_and_return;
2166 if (complete_rewrite &&
2167 (textconv_one || !diff_filespec_is_binary(one)) &&
2168 (textconv_two || !diff_filespec_is_binary(two))) {
2169 fprintf(o->file, "%s", header.buf);
2170 strbuf_reset(&header);
2171 emit_rewrite_diff(name_a, name_b, one, two,
2172 textconv_one, textconv_two, o);
2173 o->found_changes = 1;
2174 goto free_ab_and_return;
2175 }
2176 }
2177
2178 if (o->irreversible_delete && lbl[1][0] == '/') {
2179 fprintf(o->file, "%s", header.buf);
2180 strbuf_reset(&header);
2181 goto free_ab_and_return;
2182 } else if (!DIFF_OPT_TST(o, TEXT) &&
2183 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2184 (!textconv_two && diff_filespec_is_binary(two)) )) {
2185 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2186 die("unable to read files to diff");
2187 /* Quite common confusing case */
2188 if (mf1.size == mf2.size &&
2189 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2190 if (must_show_header)
2191 fprintf(o->file, "%s", header.buf);
2192 goto free_ab_and_return;
2193 }
2194 fprintf(o->file, "%s", header.buf);
2195 strbuf_reset(&header);
2196 if (DIFF_OPT_TST(o, BINARY))
2197 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2198 else
2199 fprintf(o->file, "%sBinary files %s and %s differ\n",
2200 line_prefix, lbl[0], lbl[1]);
2201 o->found_changes = 1;
2202 } else {
2203 /* Crazy xdl interfaces.. */
2204 const char *diffopts = getenv("GIT_DIFF_OPTS");
2205 xpparam_t xpp;
2206 xdemitconf_t xecfg;
2207 struct emit_callback ecbdata;
2208 const struct userdiff_funcname *pe;
2209
2210 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2211 fprintf(o->file, "%s", header.buf);
2212 strbuf_reset(&header);
2213 }
2214
2215 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2216 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2217
2218 pe = diff_funcname_pattern(one);
2219 if (!pe)
2220 pe = diff_funcname_pattern(two);
2221
2222 memset(&xpp, 0, sizeof(xpp));
2223 memset(&xecfg, 0, sizeof(xecfg));
2224 memset(&ecbdata, 0, sizeof(ecbdata));
2225 ecbdata.label_path = lbl;
2226 ecbdata.color_diff = want_color(o->use_color);
2227 ecbdata.found_changesp = &o->found_changes;
2228 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2229 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2230 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2231 ecbdata.opt = o;
2232 ecbdata.header = header.len ? &header : NULL;
2233 xpp.flags = o->xdl_opts;
2234 xecfg.ctxlen = o->context;
2235 xecfg.interhunkctxlen = o->interhunkcontext;
2236 xecfg.flags = XDL_EMIT_FUNCNAMES;
2237 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2238 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2239 if (pe)
2240 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2241 if (!diffopts)
2242 ;
2243 else if (!prefixcmp(diffopts, "--unified="))
2244 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2245 else if (!prefixcmp(diffopts, "-u"))
2246 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2247 if (o->word_diff) {
2248 int i;
2249
2250 ecbdata.diff_words =
2251 xcalloc(1, sizeof(struct diff_words_data));
2252 ecbdata.diff_words->type = o->word_diff;
2253 ecbdata.diff_words->opt = o;
2254 if (!o->word_regex)
2255 o->word_regex = userdiff_word_regex(one);
2256 if (!o->word_regex)
2257 o->word_regex = userdiff_word_regex(two);
2258 if (!o->word_regex)
2259 o->word_regex = diff_word_regex_cfg;
2260 if (o->word_regex) {
2261 ecbdata.diff_words->word_regex = (regex_t *)
2262 xmalloc(sizeof(regex_t));
2263 if (regcomp(ecbdata.diff_words->word_regex,
2264 o->word_regex,
2265 REG_EXTENDED | REG_NEWLINE))
2266 die ("Invalid regular expression: %s",
2267 o->word_regex);
2268 }
2269 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2270 if (o->word_diff == diff_words_styles[i].type) {
2271 ecbdata.diff_words->style =
2272 &diff_words_styles[i];
2273 break;
2274 }
2275 }
2276 if (want_color(o->use_color)) {
2277 struct diff_words_style *st = ecbdata.diff_words->style;
2278 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2279 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2280 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2281 }
2282 }
2283 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2284 &xpp, &xecfg);
2285 if (o->word_diff)
2286 free_diff_words_data(&ecbdata);
2287 if (textconv_one)
2288 free(mf1.ptr);
2289 if (textconv_two)
2290 free(mf2.ptr);
2291 xdiff_clear_find_func(&xecfg);
2292 }
2293
2294 free_ab_and_return:
2295 strbuf_release(&header);
2296 diff_free_filespec_data(one);
2297 diff_free_filespec_data(two);
2298 free(a_one);
2299 free(b_two);
2300 return;
2301 }
2302
2303 static void builtin_diffstat(const char *name_a, const char *name_b,
2304 struct diff_filespec *one,
2305 struct diff_filespec *two,
2306 struct diffstat_t *diffstat,
2307 struct diff_options *o,
2308 int complete_rewrite)
2309 {
2310 mmfile_t mf1, mf2;
2311 struct diffstat_file *data;
2312
2313 data = diffstat_add(diffstat, name_a, name_b);
2314
2315 if (!one || !two) {
2316 data->is_unmerged = 1;
2317 return;
2318 }
2319
2320 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2321 data->is_binary = 1;
2322 data->added = diff_filespec_size(two);
2323 data->deleted = diff_filespec_size(one);
2324 }
2325
2326 else if (complete_rewrite) {
2327 diff_populate_filespec(one, 0);
2328 diff_populate_filespec(two, 0);
2329 data->deleted = count_lines(one->data, one->size);
2330 data->added = count_lines(two->data, two->size);
2331 }
2332
2333 else {
2334 /* Crazy xdl interfaces.. */
2335 xpparam_t xpp;
2336 xdemitconf_t xecfg;
2337
2338 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2339 die("unable to read files to diff");
2340
2341 memset(&xpp, 0, sizeof(xpp));
2342 memset(&xecfg, 0, sizeof(xecfg));
2343 xpp.flags = o->xdl_opts;
2344 xecfg.ctxlen = o->context;
2345 xecfg.interhunkctxlen = o->interhunkcontext;
2346 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2347 &xpp, &xecfg);
2348 }
2349
2350 diff_free_filespec_data(one);
2351 diff_free_filespec_data(two);
2352 }
2353
2354 static void builtin_checkdiff(const char *name_a, const char *name_b,
2355 const char *attr_path,
2356 struct diff_filespec *one,
2357 struct diff_filespec *two,
2358 struct diff_options *o)
2359 {
2360 mmfile_t mf1, mf2;
2361 struct checkdiff_t data;
2362
2363 if (!two)
2364 return;
2365
2366 memset(&data, 0, sizeof(data));
2367 data.filename = name_b ? name_b : name_a;
2368 data.lineno = 0;
2369 data.o = o;
2370 data.ws_rule = whitespace_rule(attr_path);
2371 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2372
2373 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2374 die("unable to read files to diff");
2375
2376 /*
2377 * All the other codepaths check both sides, but not checking
2378 * the "old" side here is deliberate. We are checking the newly
2379 * introduced changes, and as long as the "new" side is text, we
2380 * can and should check what it introduces.
2381 */
2382 if (diff_filespec_is_binary(two))
2383 goto free_and_return;
2384 else {
2385 /* Crazy xdl interfaces.. */
2386 xpparam_t xpp;
2387 xdemitconf_t xecfg;
2388
2389 memset(&xpp, 0, sizeof(xpp));
2390 memset(&xecfg, 0, sizeof(xecfg));
2391 xecfg.ctxlen = 1; /* at least one context line */
2392 xpp.flags = 0;
2393 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2394 &xpp, &xecfg);
2395
2396 if (data.ws_rule & WS_BLANK_AT_EOF) {
2397 struct emit_callback ecbdata;
2398 int blank_at_eof;
2399
2400 ecbdata.ws_rule = data.ws_rule;
2401 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2402 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2403
2404 if (blank_at_eof) {
2405 static char *err;
2406 if (!err)
2407 err = whitespace_error_string(WS_BLANK_AT_EOF);
2408 fprintf(o->file, "%s:%d: %s.\n",
2409 data.filename, blank_at_eof, err);
2410 data.status = 1; /* report errors */
2411 }
2412 }
2413 }
2414 free_and_return:
2415 diff_free_filespec_data(one);
2416 diff_free_filespec_data(two);
2417 if (data.status)
2418 DIFF_OPT_SET(o, CHECK_FAILED);
2419 }
2420
2421 struct diff_filespec *alloc_filespec(const char *path)
2422 {
2423 int namelen = strlen(path);
2424 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2425
2426 memset(spec, 0, sizeof(*spec));
2427 spec->path = (char *)(spec + 1);
2428 memcpy(spec->path, path, namelen+1);
2429 spec->count = 1;
2430 spec->is_binary = -1;
2431 return spec;
2432 }
2433
2434 void free_filespec(struct diff_filespec *spec)
2435 {
2436 if (!--spec->count) {
2437 diff_free_filespec_data(spec);
2438 free(spec);
2439 }
2440 }
2441
2442 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2443 unsigned short mode)
2444 {
2445 if (mode) {
2446 spec->mode = canon_mode(mode);
2447 hashcpy(spec->sha1, sha1);
2448 spec->sha1_valid = !is_null_sha1(sha1);
2449 }
2450 }
2451
2452 /*
2453 * Given a name and sha1 pair, if the index tells us the file in
2454 * the work tree has that object contents, return true, so that
2455 * prepare_temp_file() does not have to inflate and extract.
2456 */
2457 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2458 {
2459 struct cache_entry *ce;
2460 struct stat st;
2461 int pos, len;
2462
2463 /*
2464 * We do not read the cache ourselves here, because the
2465 * benchmark with my previous version that always reads cache
2466 * shows that it makes things worse for diff-tree comparing
2467 * two linux-2.6 kernel trees in an already checked out work
2468 * tree. This is because most diff-tree comparisons deal with
2469 * only a small number of files, while reading the cache is
2470 * expensive for a large project, and its cost outweighs the
2471 * savings we get by not inflating the object to a temporary
2472 * file. Practically, this code only helps when we are used
2473 * by diff-cache --cached, which does read the cache before
2474 * calling us.
2475 */
2476 if (!active_cache)
2477 return 0;
2478
2479 /* We want to avoid the working directory if our caller
2480 * doesn't need the data in a normal file, this system
2481 * is rather slow with its stat/open/mmap/close syscalls,
2482 * and the object is contained in a pack file. The pack
2483 * is probably already open and will be faster to obtain
2484 * the data through than the working directory. Loose
2485 * objects however would tend to be slower as they need
2486 * to be individually opened and inflated.
2487 */
2488 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2489 return 0;
2490
2491 len = strlen(name);
2492 pos = cache_name_pos(name, len);
2493 if (pos < 0)
2494 return 0;
2495 ce = active_cache[pos];
2496
2497 /*
2498 * This is not the sha1 we are looking for, or
2499 * unreusable because it is not a regular file.
2500 */
2501 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2502 return 0;
2503
2504 /*
2505 * If ce is marked as "assume unchanged", there is no
2506 * guarantee that work tree matches what we are looking for.
2507 */
2508 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2509 return 0;
2510
2511 /*
2512 * If ce matches the file in the work tree, we can reuse it.
2513 */
2514 if (ce_uptodate(ce) ||
2515 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2516 return 1;
2517
2518 return 0;
2519 }
2520
2521 static int populate_from_stdin(struct diff_filespec *s)
2522 {
2523 struct strbuf buf = STRBUF_INIT;
2524 size_t size = 0;
2525
2526 if (strbuf_read(&buf, 0, 0) < 0)
2527 return error("error while reading from stdin %s",
2528 strerror(errno));
2529
2530 s->should_munmap = 0;
2531 s->data = strbuf_detach(&buf, &size);
2532 s->size = size;
2533 s->should_free = 1;
2534 return 0;
2535 }
2536
2537 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2538 {
2539 int len;
2540 char *data = xmalloc(100), *dirty = "";
2541
2542 /* Are we looking at the work tree? */
2543 if (s->dirty_submodule)
2544 dirty = "-dirty";
2545
2546 len = snprintf(data, 100,
2547 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2548 s->data = data;
2549 s->size = len;
2550 s->should_free = 1;
2551 if (size_only) {
2552 s->data = NULL;
2553 free(data);
2554 }
2555 return 0;
2556 }
2557
2558 /*
2559 * While doing rename detection and pickaxe operation, we may need to
2560 * grab the data for the blob (or file) for our own in-core comparison.
2561 * diff_filespec has data and size fields for this purpose.
2562 */
2563 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2564 {
2565 int err = 0;
2566 if (!DIFF_FILE_VALID(s))
2567 die("internal error: asking to populate invalid file.");
2568 if (S_ISDIR(s->mode))
2569 return -1;
2570
2571 if (s->data)
2572 return 0;
2573
2574 if (size_only && 0 < s->size)
2575 return 0;
2576
2577 if (S_ISGITLINK(s->mode))
2578 return diff_populate_gitlink(s, size_only);
2579
2580 if (!s->sha1_valid ||
2581 reuse_worktree_file(s->path, s->sha1, 0)) {
2582 struct strbuf buf = STRBUF_INIT;
2583 struct stat st;
2584 int fd;
2585
2586 if (!strcmp(s->path, "-"))
2587 return populate_from_stdin(s);
2588
2589 if (lstat(s->path, &st) < 0) {
2590 if (errno == ENOENT) {
2591 err_empty:
2592 err = -1;
2593 empty:
2594 s->data = (char *)"";
2595 s->size = 0;
2596 return err;
2597 }
2598 }
2599 s->size = xsize_t(st.st_size);
2600 if (!s->size)
2601 goto empty;
2602 if (S_ISLNK(st.st_mode)) {
2603 struct strbuf sb = STRBUF_INIT;
2604
2605 if (strbuf_readlink(&sb, s->path, s->size))
2606 goto err_empty;
2607 s->size = sb.len;
2608 s->data = strbuf_detach(&sb, NULL);
2609 s->should_free = 1;
2610 return 0;
2611 }
2612 if (size_only)
2613 return 0;
2614 fd = open(s->path, O_RDONLY);
2615 if (fd < 0)
2616 goto err_empty;
2617 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2618 close(fd);
2619 s->should_munmap = 1;
2620
2621 /*
2622 * Convert from working tree format to canonical git format
2623 */
2624 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2625 size_t size = 0;
2626 munmap(s->data, s->size);
2627 s->should_munmap = 0;
2628 s->data = strbuf_detach(&buf, &size);
2629 s->size = size;
2630 s->should_free = 1;
2631 }
2632 }
2633 else {
2634 enum object_type type;
2635 if (size_only) {
2636 type = sha1_object_info(s->sha1, &s->size);
2637 if (type < 0)
2638 die("unable to read %s", sha1_to_hex(s->sha1));
2639 } else {
2640 s->data = read_sha1_file(s->sha1, &type, &s->size);
2641 if (!s->data)
2642 die("unable to read %s", sha1_to_hex(s->sha1));
2643 s->should_free = 1;
2644 }
2645 }
2646 return 0;
2647 }
2648
2649 void diff_free_filespec_blob(struct diff_filespec *s)
2650 {
2651 if (s->should_free)
2652 free(s->data);
2653 else if (s->should_munmap)
2654 munmap(s->data, s->size);
2655
2656 if (s->should_free || s->should_munmap) {
2657 s->should_free = s->should_munmap = 0;
2658 s->data = NULL;
2659 }
2660 }
2661
2662 void diff_free_filespec_data(struct diff_filespec *s)
2663 {
2664 diff_free_filespec_blob(s);
2665 free(s->cnt_data);
2666 s->cnt_data = NULL;
2667 }
2668
2669 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2670 void *blob,
2671 unsigned long size,
2672 const unsigned char *sha1,
2673 int mode)
2674 {
2675 int fd;
2676 struct strbuf buf = STRBUF_INIT;
2677 struct strbuf template = STRBUF_INIT;
2678 char *path_dup = xstrdup(path);
2679 const char *base = basename(path_dup);
2680
2681 /* Generate "XXXXXX_basename.ext" */
2682 strbuf_addstr(&template, "XXXXXX_");
2683 strbuf_addstr(&template, base);
2684
2685 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2686 strlen(base) + 1);
2687 if (fd < 0)
2688 die_errno("unable to create temp-file");
2689 if (convert_to_working_tree(path,
2690 (const char *)blob, (size_t)size, &buf)) {
2691 blob = buf.buf;
2692 size = buf.len;
2693 }
2694 if (write_in_full(fd, blob, size) != size)
2695 die_errno("unable to write temp-file");
2696 close(fd);
2697 temp->name = temp->tmp_path;
2698 strcpy(temp->hex, sha1_to_hex(sha1));
2699 temp->hex[40] = 0;
2700 sprintf(temp->mode, "%06o", mode);
2701 strbuf_release(&buf);
2702 strbuf_release(&template);
2703 free(path_dup);
2704 }
2705
2706 static struct diff_tempfile *prepare_temp_file(const char *name,
2707 struct diff_filespec *one)
2708 {
2709 struct diff_tempfile *temp = claim_diff_tempfile();
2710
2711 if (!DIFF_FILE_VALID(one)) {
2712 not_a_valid_file:
2713 /* A '-' entry produces this for file-2, and
2714 * a '+' entry produces this for file-1.
2715 */
2716 temp->name = "/dev/null";
2717 strcpy(temp->hex, ".");
2718 strcpy(temp->mode, ".");
2719 return temp;
2720 }
2721
2722 if (!remove_tempfile_installed) {
2723 atexit(remove_tempfile);
2724 sigchain_push_common(remove_tempfile_on_signal);
2725 remove_tempfile_installed = 1;
2726 }
2727
2728 if (!one->sha1_valid ||
2729 reuse_worktree_file(name, one->sha1, 1)) {
2730 struct stat st;
2731 if (lstat(name, &st) < 0) {
2732 if (errno == ENOENT)
2733 goto not_a_valid_file;
2734 die_errno("stat(%s)", name);
2735 }
2736 if (S_ISLNK(st.st_mode)) {
2737 struct strbuf sb = STRBUF_INIT;
2738 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2739 die_errno("readlink(%s)", name);
2740 prep_temp_blob(name, temp, sb.buf, sb.len,
2741 (one->sha1_valid ?
2742 one->sha1 : null_sha1),
2743 (one->sha1_valid ?
2744 one->mode : S_IFLNK));
2745 strbuf_release(&sb);
2746 }
2747 else {
2748 /* we can borrow from the file in the work tree */
2749 temp->name = name;
2750 if (!one->sha1_valid)
2751 strcpy(temp->hex, sha1_to_hex(null_sha1));
2752 else
2753 strcpy(temp->hex, sha1_to_hex(one->sha1));
2754 /* Even though we may sometimes borrow the
2755 * contents from the work tree, we always want
2756 * one->mode. mode is trustworthy even when
2757 * !(one->sha1_valid), as long as
2758 * DIFF_FILE_VALID(one).
2759 */
2760 sprintf(temp->mode, "%06o", one->mode);
2761 }
2762 return temp;
2763 }
2764 else {
2765 if (diff_populate_filespec(one, 0))
2766 die("cannot read data blob for %s", one->path);
2767 prep_temp_blob(name, temp, one->data, one->size,
2768 one->sha1, one->mode);
2769 }
2770 return temp;
2771 }
2772
2773 /* An external diff command takes:
2774 *
2775 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2776 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2777 *
2778 */
2779 static void run_external_diff(const char *pgm,
2780 const char *name,
2781 const char *other,
2782 struct diff_filespec *one,
2783 struct diff_filespec *two,
2784 const char *xfrm_msg,
2785 int complete_rewrite)
2786 {
2787 const char *spawn_arg[10];
2788 int retval;
2789 const char **arg = &spawn_arg[0];
2790
2791 if (one && two) {
2792 struct diff_tempfile *temp_one, *temp_two;
2793 const char *othername = (other ? other : name);
2794 temp_one = prepare_temp_file(name, one);
2795 temp_two = prepare_temp_file(othername, two);
2796 *arg++ = pgm;
2797 *arg++ = name;
2798 *arg++ = temp_one->name;
2799 *arg++ = temp_one->hex;
2800 *arg++ = temp_one->mode;
2801 *arg++ = temp_two->name;
2802 *arg++ = temp_two->hex;
2803 *arg++ = temp_two->mode;
2804 if (other) {
2805 *arg++ = other;
2806 *arg++ = xfrm_msg;
2807 }
2808 } else {
2809 *arg++ = pgm;
2810 *arg++ = name;
2811 }
2812 *arg = NULL;
2813 fflush(NULL);
2814 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2815 remove_tempfile();
2816 if (retval) {
2817 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2818 exit(1);
2819 }
2820 }
2821
2822 static int similarity_index(struct diff_filepair *p)
2823 {
2824 return p->score * 100 / MAX_SCORE;
2825 }
2826
2827 static void fill_metainfo(struct strbuf *msg,
2828 const char *name,
2829 const char *other,
2830 struct diff_filespec *one,
2831 struct diff_filespec *two,
2832 struct diff_options *o,
2833 struct diff_filepair *p,
2834 int *must_show_header,
2835 int use_color)
2836 {
2837 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2838 const char *reset = diff_get_color(use_color, DIFF_RESET);
2839 struct strbuf *msgbuf;
2840 char *line_prefix = "";
2841
2842 *must_show_header = 1;
2843 if (o->output_prefix) {
2844 msgbuf = o->output_prefix(o, o->output_prefix_data);
2845 line_prefix = msgbuf->buf;
2846 }
2847 strbuf_init(msg, PATH_MAX * 2 + 300);
2848 switch (p->status) {
2849 case DIFF_STATUS_COPIED:
2850 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2851 line_prefix, set, similarity_index(p));
2852 strbuf_addf(msg, "%s\n%s%scopy from ",
2853 reset, line_prefix, set);
2854 quote_c_style(name, msg, NULL, 0);
2855 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2856 quote_c_style(other, msg, NULL, 0);
2857 strbuf_addf(msg, "%s\n", reset);
2858 break;
2859 case DIFF_STATUS_RENAMED:
2860 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2861 line_prefix, set, similarity_index(p));
2862 strbuf_addf(msg, "%s\n%s%srename from ",
2863 reset, line_prefix, set);
2864 quote_c_style(name, msg, NULL, 0);
2865 strbuf_addf(msg, "%s\n%s%srename to ",
2866 reset, line_prefix, set);
2867 quote_c_style(other, msg, NULL, 0);
2868 strbuf_addf(msg, "%s\n", reset);
2869 break;
2870 case DIFF_STATUS_MODIFIED:
2871 if (p->score) {
2872 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2873 line_prefix,
2874 set, similarity_index(p), reset);
2875 break;
2876 }
2877 /* fallthru */
2878 default:
2879 *must_show_header = 0;
2880 }
2881 if (one && two && hashcmp(one->sha1, two->sha1)) {
2882 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2883
2884 if (DIFF_OPT_TST(o, BINARY)) {
2885 mmfile_t mf;
2886 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2887 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2888 abbrev = 40;
2889 }
2890 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2891 find_unique_abbrev(one->sha1, abbrev));
2892 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2893 if (one->mode == two->mode)
2894 strbuf_addf(msg, " %06o", one->mode);
2895 strbuf_addf(msg, "%s\n", reset);
2896 }
2897 }
2898
2899 static void run_diff_cmd(const char *pgm,
2900 const char *name,
2901 const char *other,
2902 const char *attr_path,
2903 struct diff_filespec *one,
2904 struct diff_filespec *two,
2905 struct strbuf *msg,
2906 struct diff_options *o,
2907 struct diff_filepair *p)
2908 {
2909 const char *xfrm_msg = NULL;
2910 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2911 int must_show_header = 0;
2912
2913 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2914 pgm = NULL;
2915 else {
2916 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2917 if (drv && drv->external)
2918 pgm = drv->external;
2919 }
2920
2921 if (msg) {
2922 /*
2923 * don't use colors when the header is intended for an
2924 * external diff driver
2925 */
2926 fill_metainfo(msg, name, other, one, two, o, p,
2927 &must_show_header,
2928 want_color(o->use_color) && !pgm);
2929 xfrm_msg = msg->len ? msg->buf : NULL;
2930 }
2931
2932 if (pgm) {
2933 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2934 complete_rewrite);
2935 return;
2936 }
2937 if (one && two)
2938 builtin_diff(name, other ? other : name,
2939 one, two, xfrm_msg, must_show_header,
2940 o, complete_rewrite);
2941 else
2942 fprintf(o->file, "* Unmerged path %s\n", name);
2943 }
2944
2945 static void diff_fill_sha1_info(struct diff_filespec *one)
2946 {
2947 if (DIFF_FILE_VALID(one)) {
2948 if (!one->sha1_valid) {
2949 struct stat st;
2950 if (!strcmp(one->path, "-")) {
2951 hashcpy(one->sha1, null_sha1);
2952 return;
2953 }
2954 if (lstat(one->path, &st) < 0)
2955 die_errno("stat '%s'", one->path);
2956 if (index_path(one->sha1, one->path, &st, 0))
2957 die("cannot hash %s", one->path);
2958 }
2959 }
2960 else
2961 hashclr(one->sha1);
2962 }
2963
2964 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2965 {
2966 /* Strip the prefix but do not molest /dev/null and absolute paths */
2967 if (*namep && **namep != '/') {
2968 *namep += prefix_length;
2969 if (**namep == '/')
2970 ++*namep;
2971 }
2972 if (*otherp && **otherp != '/') {
2973 *otherp += prefix_length;
2974 if (**otherp == '/')
2975 ++*otherp;
2976 }
2977 }
2978
2979 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2980 {
2981 const char *pgm = external_diff();
2982 struct strbuf msg;
2983 struct diff_filespec *one = p->one;
2984 struct diff_filespec *two = p->two;
2985 const char *name;
2986 const char *other;
2987 const char *attr_path;
2988
2989 name = p->one->path;
2990 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2991 attr_path = name;
2992 if (o->prefix_length)
2993 strip_prefix(o->prefix_length, &name, &other);
2994
2995 if (DIFF_PAIR_UNMERGED(p)) {
2996 run_diff_cmd(pgm, name, NULL, attr_path,
2997 NULL, NULL, NULL, o, p);
2998 return;
2999 }
3000
3001 diff_fill_sha1_info(one);
3002 diff_fill_sha1_info(two);
3003
3004 if (!pgm &&
3005 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3006 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3007 /*
3008 * a filepair that changes between file and symlink
3009 * needs to be split into deletion and creation.
3010 */
3011 struct diff_filespec *null = alloc_filespec(two->path);
3012 run_diff_cmd(NULL, name, other, attr_path,
3013 one, null, &msg, o, p);
3014 free(null);
3015 strbuf_release(&msg);
3016
3017 null = alloc_filespec(one->path);
3018 run_diff_cmd(NULL, name, other, attr_path,
3019 null, two, &msg, o, p);
3020 free(null);
3021 }
3022 else
3023 run_diff_cmd(pgm, name, other, attr_path,
3024 one, two, &msg, o, p);
3025
3026 strbuf_release(&msg);
3027 }
3028
3029 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3030 struct diffstat_t *diffstat)
3031 {
3032 const char *name;
3033 const char *other;
3034 int complete_rewrite = 0;
3035
3036 if (DIFF_PAIR_UNMERGED(p)) {
3037 /* unmerged */
3038 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3039 return;
3040 }
3041
3042 name = p->one->path;
3043 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3044
3045 if (o->prefix_length)
3046 strip_prefix(o->prefix_length, &name, &other);
3047
3048 diff_fill_sha1_info(p->one);
3049 diff_fill_sha1_info(p->two);
3050
3051 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3052 complete_rewrite = 1;
3053 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3054 }
3055
3056 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3057 {
3058 const char *name;
3059 const char *other;
3060 const char *attr_path;
3061
3062 if (DIFF_PAIR_UNMERGED(p)) {
3063 /* unmerged */
3064 return;
3065 }
3066
3067 name = p->one->path;
3068 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3069 attr_path = other ? other : name;
3070
3071 if (o->prefix_length)
3072 strip_prefix(o->prefix_length, &name, &other);
3073
3074 diff_fill_sha1_info(p->one);
3075 diff_fill_sha1_info(p->two);
3076
3077 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3078 }
3079
3080 void diff_setup(struct diff_options *options)
3081 {
3082 memcpy(options, &default_diff_options, sizeof(*options));
3083
3084 options->file = stdout;
3085
3086 options->line_termination = '\n';
3087 options->break_opt = -1;
3088 options->rename_limit = -1;
3089 options->dirstat_permille = diff_dirstat_permille_default;
3090 options->context = 3;
3091
3092 options->change = diff_change;
3093 options->add_remove = diff_addremove;
3094 options->use_color = diff_use_color_default;
3095 options->detect_rename = diff_detect_rename_default;
3096
3097 if (diff_no_prefix) {
3098 options->a_prefix = options->b_prefix = "";
3099 } else if (!diff_mnemonic_prefix) {
3100 options->a_prefix = "a/";
3101 options->b_prefix = "b/";
3102 }
3103 }
3104
3105 int diff_setup_done(struct diff_options *options)
3106 {
3107 int count = 0;
3108
3109 if (options->output_format & DIFF_FORMAT_NAME)
3110 count++;
3111 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3112 count++;
3113 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3114 count++;
3115 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3116 count++;
3117 if (count > 1)
3118 die("--name-only, --name-status, --check and -s are mutually exclusive");
3119
3120 /*
3121 * Most of the time we can say "there are changes"
3122 * only by checking if there are changed paths, but
3123 * --ignore-whitespace* options force us to look
3124 * inside contents.
3125 */
3126
3127 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3128 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3129 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3130 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3131 else
3132 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3133
3134 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3135 options->detect_rename = DIFF_DETECT_COPY;
3136
3137 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3138 options->prefix = NULL;
3139 if (options->prefix)
3140 options->prefix_length = strlen(options->prefix);
3141 else
3142 options->prefix_length = 0;
3143
3144 if (options->output_format & (DIFF_FORMAT_NAME |
3145 DIFF_FORMAT_NAME_STATUS |
3146 DIFF_FORMAT_CHECKDIFF |
3147 DIFF_FORMAT_NO_OUTPUT))
3148 options->output_format &= ~(DIFF_FORMAT_RAW |
3149 DIFF_FORMAT_NUMSTAT |
3150 DIFF_FORMAT_DIFFSTAT |
3151 DIFF_FORMAT_SHORTSTAT |
3152 DIFF_FORMAT_DIRSTAT |
3153 DIFF_FORMAT_SUMMARY |
3154 DIFF_FORMAT_PATCH);
3155
3156 /*
3157 * These cases always need recursive; we do not drop caller-supplied
3158 * recursive bits for other formats here.
3159 */
3160 if (options->output_format & (DIFF_FORMAT_PATCH |
3161 DIFF_FORMAT_NUMSTAT |
3162 DIFF_FORMAT_DIFFSTAT |
3163 DIFF_FORMAT_SHORTSTAT |
3164 DIFF_FORMAT_DIRSTAT |
3165 DIFF_FORMAT_SUMMARY |
3166 DIFF_FORMAT_CHECKDIFF))
3167 DIFF_OPT_SET(options, RECURSIVE);
3168 /*
3169 * Also pickaxe would not work very well if you do not say recursive
3170 */
3171 if (options->pickaxe)
3172 DIFF_OPT_SET(options, RECURSIVE);
3173 /*
3174 * When patches are generated, submodules diffed against the work tree
3175 * must be checked for dirtiness too so it can be shown in the output
3176 */
3177 if (options->output_format & DIFF_FORMAT_PATCH)
3178 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3179
3180 if (options->detect_rename && options->rename_limit < 0)
3181 options->rename_limit = diff_rename_limit_default;
3182 if (options->setup & DIFF_SETUP_USE_CACHE) {
3183 if (!active_cache)
3184 /* read-cache does not die even when it fails
3185 * so it is safe for us to do this here. Also
3186 * it does not smudge active_cache or active_nr
3187 * when it fails, so we do not have to worry about
3188 * cleaning it up ourselves either.
3189 */
3190 read_cache();
3191 }
3192 if (options->abbrev <= 0 || 40 < options->abbrev)
3193 options->abbrev = 40; /* full */
3194
3195 /*
3196 * It does not make sense to show the first hit we happened
3197 * to have found. It does not make sense not to return with
3198 * exit code in such a case either.
3199 */
3200 if (DIFF_OPT_TST(options, QUICK)) {
3201 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3202 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3203 }
3204
3205 return 0;
3206 }
3207
3208 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3209 {
3210 char c, *eq;
3211 int len;
3212
3213 if (*arg != '-')
3214 return 0;
3215 c = *++arg;
3216 if (!c)
3217 return 0;
3218 if (c == arg_short) {
3219 c = *++arg;
3220 if (!c)
3221 return 1;
3222 if (val && isdigit(c)) {
3223 char *end;
3224 int n = strtoul(arg, &end, 10);
3225 if (*end)
3226 return 0;
3227 *val = n;
3228 return 1;
3229 }
3230 return 0;
3231 }
3232 if (c != '-')
3233 return 0;
3234 arg++;
3235 eq = strchr(arg, '=');
3236 if (eq)
3237 len = eq - arg;
3238 else
3239 len = strlen(arg);
3240 if (!len || strncmp(arg, arg_long, len))
3241 return 0;
3242 if (eq) {
3243 int n;
3244 char *end;
3245 if (!isdigit(*++eq))
3246 return 0;
3247 n = strtoul(eq, &end, 10);
3248 if (*end)
3249 return 0;
3250 *val = n;
3251 }
3252 return 1;
3253 }
3254
3255 static int diff_scoreopt_parse(const char *opt);
3256
3257 static inline int short_opt(char opt, const char **argv,
3258 const char **optarg)
3259 {
3260 const char *arg = argv[0];
3261 if (arg[0] != '-' || arg[1] != opt)
3262 return 0;
3263 if (arg[2] != '\0') {
3264 *optarg = arg + 2;
3265 return 1;
3266 }
3267 if (!argv[1])
3268 die("Option '%c' requires a value", opt);
3269 *optarg = argv[1];
3270 return 2;
3271 }
3272
3273 int parse_long_opt(const char *opt, const char **argv,
3274 const char **optarg)
3275 {
3276 const char *arg = argv[0];
3277 if (arg[0] != '-' || arg[1] != '-')
3278 return 0;
3279 arg += strlen("--");
3280 if (prefixcmp(arg, opt))
3281 return 0;
3282 arg += strlen(opt);
3283 if (*arg == '=') { /* sticked form: --option=value */
3284 *optarg = arg + 1;
3285 return 1;
3286 }
3287 if (*arg != '\0')
3288 return 0;
3289 /* separate form: --option value */
3290 if (!argv[1])
3291 die("Option '--%s' requires a value", opt);
3292 *optarg = argv[1];
3293 return 2;
3294 }
3295
3296 static int stat_opt(struct diff_options *options, const char **av)
3297 {
3298 const char *arg = av[0];
3299 char *end;
3300 int width = options->stat_width;
3301 int name_width = options->stat_name_width;
3302 int count = options->stat_count;
3303 int argcount = 1;
3304
3305 arg += strlen("--stat");
3306 end = (char *)arg;
3307
3308 switch (*arg) {
3309 case '-':
3310 if (!prefixcmp(arg, "-width")) {
3311 arg += strlen("-width");
3312 if (*arg == '=')
3313 width = strtoul(arg + 1, &end, 10);
3314 else if (!*arg && !av[1])
3315 die("Option '--stat-width' requires a value");
3316 else if (!*arg) {
3317 width = strtoul(av[1], &end, 10);
3318 argcount = 2;
3319 }
3320 } else if (!prefixcmp(arg, "-name-width")) {
3321 arg += strlen("-name-width");
3322 if (*arg == '=')
3323 name_width = strtoul(arg + 1, &end, 10);
3324 else if (!*arg && !av[1])
3325 die("Option '--stat-name-width' requires a value");
3326 else if (!*arg) {
3327 name_width = strtoul(av[1], &end, 10);
3328 argcount = 2;
3329 }
3330 } else if (!prefixcmp(arg, "-count")) {
3331 arg += strlen("-count");
3332 if (*arg == '=')
3333 count = strtoul(arg + 1, &end, 10);
3334 else if (!*arg && !av[1])
3335 die("Option '--stat-count' requires a value");
3336 else if (!*arg) {
3337 count = strtoul(av[1], &end, 10);
3338 argcount = 2;
3339 }
3340 }
3341 break;
3342 case '=':
3343 width = strtoul(arg+1, &end, 10);
3344 if (*end == ',')
3345 name_width = strtoul(end+1, &end, 10);
3346 if (*end == ',')
3347 count = strtoul(end+1, &end, 10);
3348 }
3349
3350 /* Important! This checks all the error cases! */
3351 if (*end)
3352 return 0;
3353 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3354 options->stat_name_width = name_width;
3355 options->stat_width = width;
3356 options->stat_count = count;
3357 return argcount;
3358 }
3359
3360 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3361 {
3362 struct strbuf errmsg = STRBUF_INIT;
3363 if (parse_dirstat_params(options, params, &errmsg))
3364 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3365 errmsg.buf);
3366 strbuf_release(&errmsg);
3367 /*
3368 * The caller knows a dirstat-related option is given from the command
3369 * line; allow it to say "return this_function();"
3370 */
3371 options->output_format |= DIFF_FORMAT_DIRSTAT;
3372 return 1;
3373 }
3374
3375 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3376 {
3377 const char *arg = av[0];
3378 const char *optarg;
3379 int argcount;
3380
3381 /* Output format options */
3382 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3383 options->output_format |= DIFF_FORMAT_PATCH;
3384 else if (opt_arg(arg, 'U', "unified", &options->context))
3385 options->output_format |= DIFF_FORMAT_PATCH;
3386 else if (!strcmp(arg, "--raw"))
3387 options->output_format |= DIFF_FORMAT_RAW;
3388 else if (!strcmp(arg, "--patch-with-raw"))
3389 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3390 else if (!strcmp(arg, "--numstat"))
3391 options->output_format |= DIFF_FORMAT_NUMSTAT;
3392 else if (!strcmp(arg, "--shortstat"))
3393 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3394 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3395 return parse_dirstat_opt(options, "");
3396 else if (!prefixcmp(arg, "-X"))
3397 return parse_dirstat_opt(options, arg + 2);
3398 else if (!prefixcmp(arg, "--dirstat="))
3399 return parse_dirstat_opt(options, arg + 10);
3400 else if (!strcmp(arg, "--cumulative"))
3401 return parse_dirstat_opt(options, "cumulative");
3402 else if (!strcmp(arg, "--dirstat-by-file"))
3403 return parse_dirstat_opt(options, "files");
3404 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3405 parse_dirstat_opt(options, "files");
3406 return parse_dirstat_opt(options, arg + 18);
3407 }
3408 else if (!strcmp(arg, "--check"))
3409 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3410 else if (!strcmp(arg, "--summary"))
3411 options->output_format |= DIFF_FORMAT_SUMMARY;
3412 else if (!strcmp(arg, "--patch-with-stat"))
3413 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3414 else if (!strcmp(arg, "--name-only"))
3415 options->output_format |= DIFF_FORMAT_NAME;
3416 else if (!strcmp(arg, "--name-status"))
3417 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3418 else if (!strcmp(arg, "-s"))
3419 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3420 else if (!prefixcmp(arg, "--stat"))
3421 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3422 return stat_opt(options, av);
3423
3424 /* renames options */
3425 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3426 !strcmp(arg, "--break-rewrites")) {
3427 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3428 return error("invalid argument to -B: %s", arg+2);
3429 }
3430 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3431 !strcmp(arg, "--find-renames")) {
3432 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3433 return error("invalid argument to -M: %s", arg+2);
3434 options->detect_rename = DIFF_DETECT_RENAME;
3435 }
3436 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3437 options->irreversible_delete = 1;
3438 }
3439 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3440 !strcmp(arg, "--find-copies")) {
3441 if (options->detect_rename == DIFF_DETECT_COPY)
3442 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3443 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3444 return error("invalid argument to -C: %s", arg+2);
3445 options->detect_rename = DIFF_DETECT_COPY;
3446 }
3447 else if (!strcmp(arg, "--no-renames"))
3448 options->detect_rename = 0;
3449 else if (!strcmp(arg, "--relative"))
3450 DIFF_OPT_SET(options, RELATIVE_NAME);
3451 else if (!prefixcmp(arg, "--relative=")) {
3452 DIFF_OPT_SET(options, RELATIVE_NAME);
3453 options->prefix = arg + 11;
3454 }
3455
3456 /* xdiff options */
3457 else if (!strcmp(arg, "--minimal"))
3458 DIFF_XDL_SET(options, NEED_MINIMAL);
3459 else if (!strcmp(arg, "--no-minimal"))
3460 DIFF_XDL_CLR(options, NEED_MINIMAL);
3461 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3462 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3463 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3464 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3465 else if (!strcmp(arg, "--ignore-space-at-eol"))
3466 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3467 else if (!strcmp(arg, "--patience"))
3468 DIFF_XDL_SET(options, PATIENCE_DIFF);
3469 else if (!strcmp(arg, "--histogram"))
3470 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3471
3472 /* flags options */
3473 else if (!strcmp(arg, "--binary")) {
3474 options->output_format |= DIFF_FORMAT_PATCH;
3475 DIFF_OPT_SET(options, BINARY);
3476 }
3477 else if (!strcmp(arg, "--full-index"))
3478 DIFF_OPT_SET(options, FULL_INDEX);
3479 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3480 DIFF_OPT_SET(options, TEXT);
3481 else if (!strcmp(arg, "-R"))
3482 DIFF_OPT_SET(options, REVERSE_DIFF);
3483 else if (!strcmp(arg, "--find-copies-harder"))
3484 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3485 else if (!strcmp(arg, "--follow"))
3486 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3487 else if (!strcmp(arg, "--color"))
3488 options->use_color = 1;
3489 else if (!prefixcmp(arg, "--color=")) {
3490 int value = git_config_colorbool(NULL, arg+8);
3491 if (value < 0)
3492 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3493 options->use_color = value;
3494 }
3495 else if (!strcmp(arg, "--no-color"))
3496 options->use_color = 0;
3497 else if (!strcmp(arg, "--color-words")) {
3498 options->use_color = 1;
3499 options->word_diff = DIFF_WORDS_COLOR;
3500 }
3501 else if (!prefixcmp(arg, "--color-words=")) {
3502 options->use_color = 1;
3503 options->word_diff = DIFF_WORDS_COLOR;
3504 options->word_regex = arg + 14;
3505 }
3506 else if (!strcmp(arg, "--word-diff")) {
3507 if (options->word_diff == DIFF_WORDS_NONE)
3508 options->word_diff = DIFF_WORDS_PLAIN;
3509 }
3510 else if (!prefixcmp(arg, "--word-diff=")) {
3511 const char *type = arg + 12;
3512 if (!strcmp(type, "plain"))
3513 options->word_diff = DIFF_WORDS_PLAIN;
3514 else if (!strcmp(type, "color")) {
3515 options->use_color = 1;
3516 options->word_diff = DIFF_WORDS_COLOR;
3517 }
3518 else if (!strcmp(type, "porcelain"))
3519 options->word_diff = DIFF_WORDS_PORCELAIN;
3520 else if (!strcmp(type, "none"))
3521 options->word_diff = DIFF_WORDS_NONE;
3522 else
3523 die("bad --word-diff argument: %s", type);
3524 }
3525 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3526 if (options->word_diff == DIFF_WORDS_NONE)
3527 options->word_diff = DIFF_WORDS_PLAIN;
3528 options->word_regex = optarg;
3529 return argcount;
3530 }
3531 else if (!strcmp(arg, "--exit-code"))
3532 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3533 else if (!strcmp(arg, "--quiet"))
3534 DIFF_OPT_SET(options, QUICK);
3535 else if (!strcmp(arg, "--ext-diff"))
3536 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3537 else if (!strcmp(arg, "--no-ext-diff"))
3538 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3539 else if (!strcmp(arg, "--textconv"))
3540 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3541 else if (!strcmp(arg, "--no-textconv"))
3542 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3543 else if (!strcmp(arg, "--ignore-submodules")) {
3544 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3545 handle_ignore_submodules_arg(options, "all");
3546 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3547 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3548 handle_ignore_submodules_arg(options, arg + 20);
3549 } else if (!strcmp(arg, "--submodule"))
3550 DIFF_OPT_SET(options, SUBMODULE_LOG);
3551 else if (!prefixcmp(arg, "--submodule=")) {
3552 if (!strcmp(arg + 12, "log"))
3553 DIFF_OPT_SET(options, SUBMODULE_LOG);
3554 }
3555
3556 /* misc options */
3557 else if (!strcmp(arg, "-z"))
3558 options->line_termination = 0;
3559 else if ((argcount = short_opt('l', av, &optarg))) {
3560 options->rename_limit = strtoul(optarg, NULL, 10);
3561 return argcount;
3562 }
3563 else if ((argcount = short_opt('S', av, &optarg))) {
3564 options->pickaxe = optarg;
3565 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3566 return argcount;
3567 } else if ((argcount = short_opt('G', av, &optarg))) {
3568 options->pickaxe = optarg;
3569 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3570 return argcount;
3571 }
3572 else if (!strcmp(arg, "--pickaxe-all"))
3573 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3574 else if (!strcmp(arg, "--pickaxe-regex"))
3575 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3576 else if ((argcount = short_opt('O', av, &optarg))) {
3577 options->orderfile = optarg;
3578 return argcount;
3579 }
3580 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3581 options->filter = optarg;
3582 return argcount;
3583 }
3584 else if (!strcmp(arg, "--abbrev"))
3585 options->abbrev = DEFAULT_ABBREV;
3586 else if (!prefixcmp(arg, "--abbrev=")) {
3587 options->abbrev = strtoul(arg + 9, NULL, 10);
3588 if (options->abbrev < MINIMUM_ABBREV)
3589 options->abbrev = MINIMUM_ABBREV;
3590 else if (40 < options->abbrev)
3591 options->abbrev = 40;
3592 }
3593 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3594 options->a_prefix = optarg;
3595 return argcount;
3596 }
3597 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3598 options->b_prefix = optarg;
3599 return argcount;
3600 }
3601 else if (!strcmp(arg, "--no-prefix"))
3602 options->a_prefix = options->b_prefix = "";
3603 else if (opt_arg(arg, '\0', "inter-hunk-context",
3604 &options->interhunkcontext))
3605 ;
3606 else if (!strcmp(arg, "-W"))
3607 DIFF_OPT_SET(options, FUNCCONTEXT);
3608 else if (!strcmp(arg, "--function-context"))
3609 DIFF_OPT_SET(options, FUNCCONTEXT);
3610 else if (!strcmp(arg, "--no-function-context"))
3611 DIFF_OPT_CLR(options, FUNCCONTEXT);
3612 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3613 options->file = fopen(optarg, "w");
3614 if (!options->file)
3615 die_errno("Could not open '%s'", optarg);
3616 options->close_file = 1;
3617 return argcount;
3618 } else
3619 return 0;
3620 return 1;
3621 }
3622
3623 int parse_rename_score(const char **cp_p)
3624 {
3625 unsigned long num, scale;
3626 int ch, dot;
3627 const char *cp = *cp_p;
3628
3629 num = 0;
3630 scale = 1;
3631 dot = 0;
3632 for (;;) {
3633 ch = *cp;
3634 if ( !dot && ch == '.' ) {
3635 scale = 1;
3636 dot = 1;
3637 } else if ( ch == '%' ) {
3638 scale = dot ? scale*100 : 100;
3639 cp++; /* % is always at the end */
3640 break;
3641 } else if ( ch >= '0' && ch <= '9' ) {
3642 if ( scale < 100000 ) {
3643 scale *= 10;
3644 num = (num*10) + (ch-'0');
3645 }
3646 } else {
3647 break;
3648 }
3649 cp++;
3650 }
3651 *cp_p = cp;
3652
3653 /* user says num divided by scale and we say internally that
3654 * is MAX_SCORE * num / scale.
3655 */
3656 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3657 }
3658
3659 static int diff_scoreopt_parse(const char *opt)
3660 {
3661 int opt1, opt2, cmd;
3662
3663 if (*opt++ != '-')
3664 return -1;
3665 cmd = *opt++;
3666 if (cmd == '-') {
3667 /* convert the long-form arguments into short-form versions */
3668 if (!prefixcmp(opt, "break-rewrites")) {
3669 opt += strlen("break-rewrites");
3670 if (*opt == 0 || *opt++ == '=')
3671 cmd = 'B';
3672 } else if (!prefixcmp(opt, "find-copies")) {
3673 opt += strlen("find-copies");
3674 if (*opt == 0 || *opt++ == '=')
3675 cmd = 'C';
3676 } else if (!prefixcmp(opt, "find-renames")) {
3677 opt += strlen("find-renames");
3678 if (*opt == 0 || *opt++ == '=')
3679 cmd = 'M';
3680 }
3681 }
3682 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3683 return -1; /* that is not a -M, -C nor -B option */
3684
3685 opt1 = parse_rename_score(&opt);
3686 if (cmd != 'B')
3687 opt2 = 0;
3688 else {
3689 if (*opt == 0)
3690 opt2 = 0;
3691 else if (*opt != '/')
3692 return -1; /* we expect -B80/99 or -B80 */
3693 else {
3694 opt++;
3695 opt2 = parse_rename_score(&opt);
3696 }
3697 }
3698 if (*opt != 0)
3699 return -1;
3700 return opt1 | (opt2 << 16);
3701 }
3702
3703 struct diff_queue_struct diff_queued_diff;
3704
3705 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3706 {
3707 if (queue->alloc <= queue->nr) {
3708 queue->alloc = alloc_nr(queue->alloc);
3709 queue->queue = xrealloc(queue->queue,
3710 sizeof(dp) * queue->alloc);
3711 }
3712 queue->queue[queue->nr++] = dp;
3713 }
3714
3715 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3716 struct diff_filespec *one,
3717 struct diff_filespec *two)
3718 {
3719 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3720 dp->one = one;
3721 dp->two = two;
3722 if (queue)
3723 diff_q(queue, dp);
3724 return dp;
3725 }
3726
3727 void diff_free_filepair(struct diff_filepair *p)
3728 {
3729 free_filespec(p->one);
3730 free_filespec(p->two);
3731 free(p);
3732 }
3733
3734 /* This is different from find_unique_abbrev() in that
3735 * it stuffs the result with dots for alignment.
3736 */
3737 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3738 {
3739 int abblen;
3740 const char *abbrev;
3741 if (len == 40)
3742 return sha1_to_hex(sha1);
3743
3744 abbrev = find_unique_abbrev(sha1, len);
3745 abblen = strlen(abbrev);
3746 if (abblen < 37) {
3747 static char hex[41];
3748 if (len < abblen && abblen <= len + 2)
3749 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3750 else
3751 sprintf(hex, "%s...", abbrev);
3752 return hex;
3753 }
3754 return sha1_to_hex(sha1);
3755 }
3756
3757 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3758 {
3759 int line_termination = opt->line_termination;
3760 int inter_name_termination = line_termination ? '\t' : '\0';
3761 if (opt->output_prefix) {
3762 struct strbuf *msg = NULL;
3763 msg = opt->output_prefix(opt, opt->output_prefix_data);
3764 fprintf(opt->file, "%s", msg->buf);
3765 }
3766
3767 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3768 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3769 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3770 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3771 }
3772 if (p->score) {
3773 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3774 inter_name_termination);
3775 } else {
3776 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3777 }
3778
3779 if (p->status == DIFF_STATUS_COPIED ||
3780 p->status == DIFF_STATUS_RENAMED) {
3781 const char *name_a, *name_b;
3782 name_a = p->one->path;
3783 name_b = p->two->path;
3784 strip_prefix(opt->prefix_length, &name_a, &name_b);
3785 write_name_quoted(name_a, opt->file, inter_name_termination);
3786 write_name_quoted(name_b, opt->file, line_termination);
3787 } else {
3788 const char *name_a, *name_b;
3789 name_a = p->one->mode ? p->one->path : p->two->path;
3790 name_b = NULL;
3791 strip_prefix(opt->prefix_length, &name_a, &name_b);
3792 write_name_quoted(name_a, opt->file, line_termination);
3793 }
3794 }
3795
3796 int diff_unmodified_pair(struct diff_filepair *p)
3797 {
3798 /* This function is written stricter than necessary to support
3799 * the currently implemented transformers, but the idea is to
3800 * let transformers to produce diff_filepairs any way they want,
3801 * and filter and clean them up here before producing the output.
3802 */
3803 struct diff_filespec *one = p->one, *two = p->two;
3804
3805 if (DIFF_PAIR_UNMERGED(p))
3806 return 0; /* unmerged is interesting */
3807
3808 /* deletion, addition, mode or type change
3809 * and rename are all interesting.
3810 */
3811 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3812 DIFF_PAIR_MODE_CHANGED(p) ||
3813 strcmp(one->path, two->path))
3814 return 0;
3815
3816 /* both are valid and point at the same path. that is, we are
3817 * dealing with a change.
3818 */
3819 if (one->sha1_valid && two->sha1_valid &&
3820 !hashcmp(one->sha1, two->sha1) &&
3821 !one->dirty_submodule && !two->dirty_submodule)
3822 return 1; /* no change */
3823 if (!one->sha1_valid && !two->sha1_valid)
3824 return 1; /* both look at the same file on the filesystem. */
3825 return 0;
3826 }
3827
3828 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
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 tree diffs in patch format */
3836
3837 run_diff(p, o);
3838 }
3839
3840 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3841 struct diffstat_t *diffstat)
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; /* no useful stat for tree diffs */
3849
3850 run_diffstat(p, o, diffstat);
3851 }
3852
3853 static void diff_flush_checkdiff(struct diff_filepair *p,
3854 struct diff_options *o)
3855 {
3856 if (diff_unmodified_pair(p))
3857 return;
3858
3859 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3860 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3861 return; /* nothing to check in tree diffs */
3862
3863 run_checkdiff(p, o);
3864 }
3865
3866 int diff_queue_is_empty(void)
3867 {
3868 struct diff_queue_struct *q = &diff_queued_diff;
3869 int i;
3870 for (i = 0; i < q->nr; i++)
3871 if (!diff_unmodified_pair(q->queue[i]))
3872 return 0;
3873 return 1;
3874 }
3875
3876 #if DIFF_DEBUG
3877 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3878 {
3879 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3880 x, one ? one : "",
3881 s->path,
3882 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3883 s->mode,
3884 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3885 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3886 x, one ? one : "",
3887 s->size, s->xfrm_flags);
3888 }
3889
3890 void diff_debug_filepair(const struct diff_filepair *p, int i)
3891 {
3892 diff_debug_filespec(p->one, i, "one");
3893 diff_debug_filespec(p->two, i, "two");
3894 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3895 p->score, p->status ? p->status : '?',
3896 p->one->rename_used, p->broken_pair);
3897 }
3898
3899 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3900 {
3901 int i;
3902 if (msg)
3903 fprintf(stderr, "%s\n", msg);
3904 fprintf(stderr, "q->nr = %d\n", q->nr);
3905 for (i = 0; i < q->nr; i++) {
3906 struct diff_filepair *p = q->queue[i];
3907 diff_debug_filepair(p, i);
3908 }
3909 }
3910 #endif
3911
3912 static void diff_resolve_rename_copy(void)
3913 {
3914 int i;
3915 struct diff_filepair *p;
3916 struct diff_queue_struct *q = &diff_queued_diff;
3917
3918 diff_debug_queue("resolve-rename-copy", q);
3919
3920 for (i = 0; i < q->nr; i++) {
3921 p = q->queue[i];
3922 p->status = 0; /* undecided */
3923 if (DIFF_PAIR_UNMERGED(p))
3924 p->status = DIFF_STATUS_UNMERGED;
3925 else if (!DIFF_FILE_VALID(p->one))
3926 p->status = DIFF_STATUS_ADDED;
3927 else if (!DIFF_FILE_VALID(p->two))
3928 p->status = DIFF_STATUS_DELETED;
3929 else if (DIFF_PAIR_TYPE_CHANGED(p))
3930 p->status = DIFF_STATUS_TYPE_CHANGED;
3931
3932 /* from this point on, we are dealing with a pair
3933 * whose both sides are valid and of the same type, i.e.
3934 * either in-place edit or rename/copy edit.
3935 */
3936 else if (DIFF_PAIR_RENAME(p)) {
3937 /*
3938 * A rename might have re-connected a broken
3939 * pair up, causing the pathnames to be the
3940 * same again. If so, that's not a rename at
3941 * all, just a modification..
3942 *
3943 * Otherwise, see if this source was used for
3944 * multiple renames, in which case we decrement
3945 * the count, and call it a copy.
3946 */
3947 if (!strcmp(p->one->path, p->two->path))
3948 p->status = DIFF_STATUS_MODIFIED;
3949 else if (--p->one->rename_used > 0)
3950 p->status = DIFF_STATUS_COPIED;
3951 else
3952 p->status = DIFF_STATUS_RENAMED;
3953 }
3954 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3955 p->one->mode != p->two->mode ||
3956 p->one->dirty_submodule ||
3957 p->two->dirty_submodule ||
3958 is_null_sha1(p->one->sha1))
3959 p->status = DIFF_STATUS_MODIFIED;
3960 else {
3961 /* This is a "no-change" entry and should not
3962 * happen anymore, but prepare for broken callers.
3963 */
3964 error("feeding unmodified %s to diffcore",
3965 p->one->path);
3966 p->status = DIFF_STATUS_UNKNOWN;
3967 }
3968 }
3969 diff_debug_queue("resolve-rename-copy done", q);
3970 }
3971
3972 static int check_pair_status(struct diff_filepair *p)
3973 {
3974 switch (p->status) {
3975 case DIFF_STATUS_UNKNOWN:
3976 return 0;
3977 case 0:
3978 die("internal error in diff-resolve-rename-copy");
3979 default:
3980 return 1;
3981 }
3982 }
3983
3984 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3985 {
3986 int fmt = opt->output_format;
3987
3988 if (fmt & DIFF_FORMAT_CHECKDIFF)
3989 diff_flush_checkdiff(p, opt);
3990 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3991 diff_flush_raw(p, opt);
3992 else if (fmt & DIFF_FORMAT_NAME) {
3993 const char *name_a, *name_b;
3994 name_a = p->two->path;
3995 name_b = NULL;
3996 strip_prefix(opt->prefix_length, &name_a, &name_b);
3997 write_name_quoted(name_a, opt->file, opt->line_termination);
3998 }
3999 }
4000
4001 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4002 {
4003 if (fs->mode)
4004 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4005 else
4006 fprintf(file, " %s ", newdelete);
4007 write_name_quoted(fs->path, file, '\n');
4008 }
4009
4010
4011 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4012 const char *line_prefix)
4013 {
4014 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4015 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4016 p->two->mode, show_name ? ' ' : '\n');
4017 if (show_name) {
4018 write_name_quoted(p->two->path, file, '\n');
4019 }
4020 }
4021 }
4022
4023 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4024 const char *line_prefix)
4025 {
4026 char *names = pprint_rename(p->one->path, p->two->path);
4027
4028 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4029 free(names);
4030 show_mode_change(file, p, 0, line_prefix);
4031 }
4032
4033 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4034 {
4035 FILE *file = opt->file;
4036 char *line_prefix = "";
4037
4038 if (opt->output_prefix) {
4039 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4040 line_prefix = buf->buf;
4041 }
4042
4043 switch(p->status) {
4044 case DIFF_STATUS_DELETED:
4045 fputs(line_prefix, file);
4046 show_file_mode_name(file, "delete", p->one);
4047 break;
4048 case DIFF_STATUS_ADDED:
4049 fputs(line_prefix, file);
4050 show_file_mode_name(file, "create", p->two);
4051 break;
4052 case DIFF_STATUS_COPIED:
4053 fputs(line_prefix, file);
4054 show_rename_copy(file, "copy", p, line_prefix);
4055 break;
4056 case DIFF_STATUS_RENAMED:
4057 fputs(line_prefix, file);
4058 show_rename_copy(file, "rename", p, line_prefix);
4059 break;
4060 default:
4061 if (p->score) {
4062 fprintf(file, "%s rewrite ", line_prefix);
4063 write_name_quoted(p->two->path, file, ' ');
4064 fprintf(file, "(%d%%)\n", similarity_index(p));
4065 }
4066 show_mode_change(file, p, !p->score, line_prefix);
4067 break;
4068 }
4069 }
4070
4071 struct patch_id_t {
4072 git_SHA_CTX *ctx;
4073 int patchlen;
4074 };
4075
4076 static int remove_space(char *line, int len)
4077 {
4078 int i;
4079 char *dst = line;
4080 unsigned char c;
4081
4082 for (i = 0; i < len; i++)
4083 if (!isspace((c = line[i])))
4084 *dst++ = c;
4085
4086 return dst - line;
4087 }
4088
4089 static void patch_id_consume(void *priv, char *line, unsigned long len)
4090 {
4091 struct patch_id_t *data = priv;
4092 int new_len;
4093
4094 /* Ignore line numbers when computing the SHA1 of the patch */
4095 if (!prefixcmp(line, "@@ -"))
4096 return;
4097
4098 new_len = remove_space(line, len);
4099
4100 git_SHA1_Update(data->ctx, line, new_len);
4101 data->patchlen += new_len;
4102 }
4103
4104 /* returns 0 upon success, and writes result into sha1 */
4105 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4106 {
4107 struct diff_queue_struct *q = &diff_queued_diff;
4108 int i;
4109 git_SHA_CTX ctx;
4110 struct patch_id_t data;
4111 char buffer[PATH_MAX * 4 + 20];
4112
4113 git_SHA1_Init(&ctx);
4114 memset(&data, 0, sizeof(struct patch_id_t));
4115 data.ctx = &ctx;
4116
4117 for (i = 0; i < q->nr; i++) {
4118 xpparam_t xpp;
4119 xdemitconf_t xecfg;
4120 mmfile_t mf1, mf2;
4121 struct diff_filepair *p = q->queue[i];
4122 int len1, len2;
4123
4124 memset(&xpp, 0, sizeof(xpp));
4125 memset(&xecfg, 0, sizeof(xecfg));
4126 if (p->status == 0)
4127 return error("internal diff status error");
4128 if (p->status == DIFF_STATUS_UNKNOWN)
4129 continue;
4130 if (diff_unmodified_pair(p))
4131 continue;
4132 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4133 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4134 continue;
4135 if (DIFF_PAIR_UNMERGED(p))
4136 continue;
4137
4138 diff_fill_sha1_info(p->one);
4139 diff_fill_sha1_info(p->two);
4140 if (fill_mmfile(&mf1, p->one) < 0 ||
4141 fill_mmfile(&mf2, p->two) < 0)
4142 return error("unable to read files to diff");
4143
4144 len1 = remove_space(p->one->path, strlen(p->one->path));
4145 len2 = remove_space(p->two->path, strlen(p->two->path));
4146 if (p->one->mode == 0)
4147 len1 = snprintf(buffer, sizeof(buffer),
4148 "diff--gita/%.*sb/%.*s"
4149 "newfilemode%06o"
4150 "---/dev/null"
4151 "+++b/%.*s",
4152 len1, p->one->path,
4153 len2, p->two->path,
4154 p->two->mode,
4155 len2, p->two->path);
4156 else if (p->two->mode == 0)
4157 len1 = snprintf(buffer, sizeof(buffer),
4158 "diff--gita/%.*sb/%.*s"
4159 "deletedfilemode%06o"
4160 "---a/%.*s"
4161 "+++/dev/null",
4162 len1, p->one->path,
4163 len2, p->two->path,
4164 p->one->mode,
4165 len1, p->one->path);
4166 else
4167 len1 = snprintf(buffer, sizeof(buffer),
4168 "diff--gita/%.*sb/%.*s"
4169 "---a/%.*s"
4170 "+++b/%.*s",
4171 len1, p->one->path,
4172 len2, p->two->path,
4173 len1, p->one->path,
4174 len2, p->two->path);
4175 git_SHA1_Update(&ctx, buffer, len1);
4176
4177 if (diff_filespec_is_binary(p->one) ||
4178 diff_filespec_is_binary(p->two)) {
4179 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4180 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4181 continue;
4182 }
4183
4184 xpp.flags = 0;
4185 xecfg.ctxlen = 3;
4186 xecfg.flags = 0;
4187 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4188 &xpp, &xecfg);
4189 }
4190
4191 git_SHA1_Final(sha1, &ctx);
4192 return 0;
4193 }
4194
4195 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4196 {
4197 struct diff_queue_struct *q = &diff_queued_diff;
4198 int i;
4199 int result = diff_get_patch_id(options, sha1);
4200
4201 for (i = 0; i < q->nr; i++)
4202 diff_free_filepair(q->queue[i]);
4203
4204 free(q->queue);
4205 DIFF_QUEUE_CLEAR(q);
4206
4207 return result;
4208 }
4209
4210 static int is_summary_empty(const struct diff_queue_struct *q)
4211 {
4212 int i;
4213
4214 for (i = 0; i < q->nr; i++) {
4215 const struct diff_filepair *p = q->queue[i];
4216
4217 switch (p->status) {
4218 case DIFF_STATUS_DELETED:
4219 case DIFF_STATUS_ADDED:
4220 case DIFF_STATUS_COPIED:
4221 case DIFF_STATUS_RENAMED:
4222 return 0;
4223 default:
4224 if (p->score)
4225 return 0;
4226 if (p->one->mode && p->two->mode &&
4227 p->one->mode != p->two->mode)
4228 return 0;
4229 break;
4230 }
4231 }
4232 return 1;
4233 }
4234
4235 static const char rename_limit_warning[] =
4236 "inexact rename detection was skipped due to too many files.";
4237
4238 static const char degrade_cc_to_c_warning[] =
4239 "only found copies from modified paths due to too many files.";
4240
4241 static const char rename_limit_advice[] =
4242 "you may want to set your %s variable to at least "
4243 "%d and retry the command.";
4244
4245 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4246 {
4247 if (degraded_cc)
4248 warning(degrade_cc_to_c_warning);
4249 else if (needed)
4250 warning(rename_limit_warning);
4251 else
4252 return;
4253 if (0 < needed && needed < 32767)
4254 warning(rename_limit_advice, varname, needed);
4255 }
4256
4257 void diff_flush(struct diff_options *options)
4258 {
4259 struct diff_queue_struct *q = &diff_queued_diff;
4260 int i, output_format = options->output_format;
4261 int separator = 0;
4262 int dirstat_by_line = 0;
4263
4264 /*
4265 * Order: raw, stat, summary, patch
4266 * or: name/name-status/checkdiff (other bits clear)
4267 */
4268 if (!q->nr)
4269 goto free_queue;
4270
4271 if (output_format & (DIFF_FORMAT_RAW |
4272 DIFF_FORMAT_NAME |
4273 DIFF_FORMAT_NAME_STATUS |
4274 DIFF_FORMAT_CHECKDIFF)) {
4275 for (i = 0; i < q->nr; i++) {
4276 struct diff_filepair *p = q->queue[i];
4277 if (check_pair_status(p))
4278 flush_one_pair(p, options);
4279 }
4280 separator++;
4281 }
4282
4283 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4284 dirstat_by_line = 1;
4285
4286 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4287 dirstat_by_line) {
4288 struct diffstat_t diffstat;
4289
4290 memset(&diffstat, 0, sizeof(struct diffstat_t));
4291 for (i = 0; i < q->nr; i++) {
4292 struct diff_filepair *p = q->queue[i];
4293 if (check_pair_status(p))
4294 diff_flush_stat(p, options, &diffstat);
4295 }
4296 if (output_format & DIFF_FORMAT_NUMSTAT)
4297 show_numstat(&diffstat, options);
4298 if (output_format & DIFF_FORMAT_DIFFSTAT)
4299 show_stats(&diffstat, options);
4300 if (output_format & DIFF_FORMAT_SHORTSTAT)
4301 show_shortstats(&diffstat, options);
4302 if (output_format & DIFF_FORMAT_DIRSTAT)
4303 show_dirstat_by_line(&diffstat, options);
4304 free_diffstat_info(&diffstat);
4305 separator++;
4306 }
4307 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4308 show_dirstat(options);
4309
4310 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4311 for (i = 0; i < q->nr; i++) {
4312 diff_summary(options, q->queue[i]);
4313 }
4314 separator++;
4315 }
4316
4317 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4318 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4319 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4320 /*
4321 * run diff_flush_patch for the exit status. setting
4322 * options->file to /dev/null should be safe, becaue we
4323 * aren't supposed to produce any output anyway.
4324 */
4325 if (options->close_file)
4326 fclose(options->file);
4327 options->file = fopen("/dev/null", "w");
4328 if (!options->file)
4329 die_errno("Could not open /dev/null");
4330 options->close_file = 1;
4331 for (i = 0; i < q->nr; i++) {
4332 struct diff_filepair *p = q->queue[i];
4333 if (check_pair_status(p))
4334 diff_flush_patch(p, options);
4335 if (options->found_changes)
4336 break;
4337 }
4338 }
4339
4340 if (output_format & DIFF_FORMAT_PATCH) {
4341 if (separator) {
4342 putc(options->line_termination, options->file);
4343 if (options->stat_sep) {
4344 /* attach patch instead of inline */
4345 fputs(options->stat_sep, options->file);
4346 }
4347 }
4348
4349 for (i = 0; i < q->nr; i++) {
4350 struct diff_filepair *p = q->queue[i];
4351 if (check_pair_status(p))
4352 diff_flush_patch(p, options);
4353 }
4354 }
4355
4356 if (output_format & DIFF_FORMAT_CALLBACK)
4357 options->format_callback(q, options, options->format_callback_data);
4358
4359 for (i = 0; i < q->nr; i++)
4360 diff_free_filepair(q->queue[i]);
4361 free_queue:
4362 free(q->queue);
4363 DIFF_QUEUE_CLEAR(q);
4364 if (options->close_file)
4365 fclose(options->file);
4366
4367 /*
4368 * Report the content-level differences with HAS_CHANGES;
4369 * diff_addremove/diff_change does not set the bit when
4370 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4371 */
4372 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4373 if (options->found_changes)
4374 DIFF_OPT_SET(options, HAS_CHANGES);
4375 else
4376 DIFF_OPT_CLR(options, HAS_CHANGES);
4377 }
4378 }
4379
4380 static void diffcore_apply_filter(const char *filter)
4381 {
4382 int i;
4383 struct diff_queue_struct *q = &diff_queued_diff;
4384 struct diff_queue_struct outq;
4385 DIFF_QUEUE_CLEAR(&outq);
4386
4387 if (!filter)
4388 return;
4389
4390 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4391 int found;
4392 for (i = found = 0; !found && i < q->nr; i++) {
4393 struct diff_filepair *p = q->queue[i];
4394 if (((p->status == DIFF_STATUS_MODIFIED) &&
4395 ((p->score &&
4396 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4397 (!p->score &&
4398 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4399 ((p->status != DIFF_STATUS_MODIFIED) &&
4400 strchr(filter, p->status)))
4401 found++;
4402 }
4403 if (found)
4404 return;
4405
4406 /* otherwise we will clear the whole queue
4407 * by copying the empty outq at the end of this
4408 * function, but first clear the current entries
4409 * in the queue.
4410 */
4411 for (i = 0; i < q->nr; i++)
4412 diff_free_filepair(q->queue[i]);
4413 }
4414 else {
4415 /* Only the matching ones */
4416 for (i = 0; i < q->nr; i++) {
4417 struct diff_filepair *p = q->queue[i];
4418
4419 if (((p->status == DIFF_STATUS_MODIFIED) &&
4420 ((p->score &&
4421 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4422 (!p->score &&
4423 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4424 ((p->status != DIFF_STATUS_MODIFIED) &&
4425 strchr(filter, p->status)))
4426 diff_q(&outq, p);
4427 else
4428 diff_free_filepair(p);
4429 }
4430 }
4431 free(q->queue);
4432 *q = outq;
4433 }
4434
4435 /* Check whether two filespecs with the same mode and size are identical */
4436 static int diff_filespec_is_identical(struct diff_filespec *one,
4437 struct diff_filespec *two)
4438 {
4439 if (S_ISGITLINK(one->mode))
4440 return 0;
4441 if (diff_populate_filespec(one, 0))
4442 return 0;
4443 if (diff_populate_filespec(two, 0))
4444 return 0;
4445 return !memcmp(one->data, two->data, one->size);
4446 }
4447
4448 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4449 {
4450 int i;
4451 struct diff_queue_struct *q = &diff_queued_diff;
4452 struct diff_queue_struct outq;
4453 DIFF_QUEUE_CLEAR(&outq);
4454
4455 for (i = 0; i < q->nr; i++) {
4456 struct diff_filepair *p = q->queue[i];
4457
4458 /*
4459 * 1. Entries that come from stat info dirtiness
4460 * always have both sides (iow, not create/delete),
4461 * one side of the object name is unknown, with
4462 * the same mode and size. Keep the ones that
4463 * do not match these criteria. They have real
4464 * differences.
4465 *
4466 * 2. At this point, the file is known to be modified,
4467 * with the same mode and size, and the object
4468 * name of one side is unknown. Need to inspect
4469 * the identical contents.
4470 */
4471 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4472 !DIFF_FILE_VALID(p->two) ||
4473 (p->one->sha1_valid && p->two->sha1_valid) ||
4474 (p->one->mode != p->two->mode) ||
4475 diff_populate_filespec(p->one, 1) ||
4476 diff_populate_filespec(p->two, 1) ||
4477 (p->one->size != p->two->size) ||
4478 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4479 diff_q(&outq, p);
4480 else {
4481 /*
4482 * The caller can subtract 1 from skip_stat_unmatch
4483 * to determine how many paths were dirty only
4484 * due to stat info mismatch.
4485 */
4486 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4487 diffopt->skip_stat_unmatch++;
4488 diff_free_filepair(p);
4489 }
4490 }
4491 free(q->queue);
4492 *q = outq;
4493 }
4494
4495 static int diffnamecmp(const void *a_, const void *b_)
4496 {
4497 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4498 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4499 const char *name_a, *name_b;
4500
4501 name_a = a->one ? a->one->path : a->two->path;
4502 name_b = b->one ? b->one->path : b->two->path;
4503 return strcmp(name_a, name_b);
4504 }
4505
4506 void diffcore_fix_diff_index(struct diff_options *options)
4507 {
4508 struct diff_queue_struct *q = &diff_queued_diff;
4509 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4510 }
4511
4512 void diffcore_std(struct diff_options *options)
4513 {
4514 if (options->skip_stat_unmatch)
4515 diffcore_skip_stat_unmatch(options);
4516 if (!options->found_follow) {
4517 /* See try_to_follow_renames() in tree-diff.c */
4518 if (options->break_opt != -1)
4519 diffcore_break(options->break_opt);
4520 if (options->detect_rename)
4521 diffcore_rename(options);
4522 if (options->break_opt != -1)
4523 diffcore_merge_broken();
4524 }
4525 if (options->pickaxe)
4526 diffcore_pickaxe(options);
4527 if (options->orderfile)
4528 diffcore_order(options->orderfile);
4529 if (!options->found_follow)
4530 /* See try_to_follow_renames() in tree-diff.c */
4531 diff_resolve_rename_copy();
4532 diffcore_apply_filter(options->filter);
4533
4534 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4535 DIFF_OPT_SET(options, HAS_CHANGES);
4536 else
4537 DIFF_OPT_CLR(options, HAS_CHANGES);
4538
4539 options->found_follow = 0;
4540 }
4541
4542 int diff_result_code(struct diff_options *opt, int status)
4543 {
4544 int result = 0;
4545
4546 diff_warn_rename_limit("diff.renamelimit",
4547 opt->needed_rename_limit,
4548 opt->degraded_cc_to_c);
4549 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4550 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4551 return status;
4552 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4553 DIFF_OPT_TST(opt, HAS_CHANGES))
4554 result |= 01;
4555 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4556 DIFF_OPT_TST(opt, CHECK_FAILED))
4557 result |= 02;
4558 return result;
4559 }
4560
4561 int diff_can_quit_early(struct diff_options *opt)
4562 {
4563 return (DIFF_OPT_TST(opt, QUICK) &&
4564 !opt->filter &&
4565 DIFF_OPT_TST(opt, HAS_CHANGES));
4566 }
4567
4568 /*
4569 * Shall changes to this submodule be ignored?
4570 *
4571 * Submodule changes can be configured to be ignored separately for each path,
4572 * but that configuration can be overridden from the command line.
4573 */
4574 static int is_submodule_ignored(const char *path, struct diff_options *options)
4575 {
4576 int ignored = 0;
4577 unsigned orig_flags = options->flags;
4578 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4579 set_diffopt_flags_from_submodule_config(options, path);
4580 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4581 ignored = 1;
4582 options->flags = orig_flags;
4583 return ignored;
4584 }
4585
4586 void diff_addremove(struct diff_options *options,
4587 int addremove, unsigned mode,
4588 const unsigned char *sha1,
4589 const char *concatpath, unsigned dirty_submodule)
4590 {
4591 struct diff_filespec *one, *two;
4592
4593 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4594 return;
4595
4596 /* This may look odd, but it is a preparation for
4597 * feeding "there are unchanged files which should
4598 * not produce diffs, but when you are doing copy
4599 * detection you would need them, so here they are"
4600 * entries to the diff-core. They will be prefixed
4601 * with something like '=' or '*' (I haven't decided
4602 * which but should not make any difference).
4603 * Feeding the same new and old to diff_change()
4604 * also has the same effect.
4605 * Before the final output happens, they are pruned after
4606 * merged into rename/copy pairs as appropriate.
4607 */
4608 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4609 addremove = (addremove == '+' ? '-' :
4610 addremove == '-' ? '+' : addremove);
4611
4612 if (options->prefix &&
4613 strncmp(concatpath, options->prefix, options->prefix_length))
4614 return;
4615
4616 one = alloc_filespec(concatpath);
4617 two = alloc_filespec(concatpath);
4618
4619 if (addremove != '+')
4620 fill_filespec(one, sha1, mode);
4621 if (addremove != '-') {
4622 fill_filespec(two, sha1, mode);
4623 two->dirty_submodule = dirty_submodule;
4624 }
4625
4626 diff_queue(&diff_queued_diff, one, two);
4627 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4628 DIFF_OPT_SET(options, HAS_CHANGES);
4629 }
4630
4631 void diff_change(struct diff_options *options,
4632 unsigned old_mode, unsigned new_mode,
4633 const unsigned char *old_sha1,
4634 const unsigned char *new_sha1,
4635 const char *concatpath,
4636 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4637 {
4638 struct diff_filespec *one, *two;
4639
4640 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4641 is_submodule_ignored(concatpath, options))
4642 return;
4643
4644 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4645 unsigned tmp;
4646 const unsigned char *tmp_c;
4647 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4648 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4649 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4650 new_dirty_submodule = tmp;
4651 }
4652
4653 if (options->prefix &&
4654 strncmp(concatpath, options->prefix, options->prefix_length))
4655 return;
4656
4657 one = alloc_filespec(concatpath);
4658 two = alloc_filespec(concatpath);
4659 fill_filespec(one, old_sha1, old_mode);
4660 fill_filespec(two, new_sha1, new_mode);
4661 one->dirty_submodule = old_dirty_submodule;
4662 two->dirty_submodule = new_dirty_submodule;
4663
4664 diff_queue(&diff_queued_diff, one, two);
4665 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4666 DIFF_OPT_SET(options, HAS_CHANGES);
4667 }
4668
4669 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4670 {
4671 struct diff_filepair *pair;
4672 struct diff_filespec *one, *two;
4673
4674 if (options->prefix &&
4675 strncmp(path, options->prefix, options->prefix_length))
4676 return NULL;
4677
4678 one = alloc_filespec(path);
4679 two = alloc_filespec(path);
4680 pair = diff_queue(&diff_queued_diff, one, two);
4681 pair->is_unmerged = 1;
4682 return pair;
4683 }
4684
4685 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4686 size_t *outsize)
4687 {
4688 struct diff_tempfile *temp;
4689 const char *argv[3];
4690 const char **arg = argv;
4691 struct child_process child;
4692 struct strbuf buf = STRBUF_INIT;
4693 int err = 0;
4694
4695 temp = prepare_temp_file(spec->path, spec);
4696 *arg++ = pgm;
4697 *arg++ = temp->name;
4698 *arg = NULL;
4699
4700 memset(&child, 0, sizeof(child));
4701 child.use_shell = 1;
4702 child.argv = argv;
4703 child.out = -1;
4704 if (start_command(&child)) {
4705 remove_tempfile();
4706 return NULL;
4707 }
4708
4709 if (strbuf_read(&buf, child.out, 0) < 0)
4710 err = error("error reading from textconv command '%s'", pgm);
4711 close(child.out);
4712
4713 if (finish_command(&child) || err) {
4714 strbuf_release(&buf);
4715 remove_tempfile();
4716 return NULL;
4717 }
4718 remove_tempfile();
4719
4720 return strbuf_detach(&buf, outsize);
4721 }
4722
4723 size_t fill_textconv(struct userdiff_driver *driver,
4724 struct diff_filespec *df,
4725 char **outbuf)
4726 {
4727 size_t size;
4728
4729 if (!driver || !driver->textconv) {
4730 if (!DIFF_FILE_VALID(df)) {
4731 *outbuf = "";
4732 return 0;
4733 }
4734 if (diff_populate_filespec(df, 0))
4735 die("unable to read files to diff");
4736 *outbuf = df->data;
4737 return df->size;
4738 }
4739
4740 if (driver->textconv_cache && df->sha1_valid) {
4741 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4742 &size);
4743 if (*outbuf)
4744 return size;
4745 }
4746
4747 *outbuf = run_textconv(driver->textconv, df, &size);
4748 if (!*outbuf)
4749 die("unable to read files to diff");
4750
4751 if (driver->textconv_cache && df->sha1_valid) {
4752 /* ignore errors, as we might be in a readonly repository */
4753 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4754 size);
4755 /*
4756 * we could save up changes and flush them all at the end,
4757 * but we would need an extra call after all diffing is done.
4758 * Since generating a cache entry is the slow path anyway,
4759 * this extra overhead probably isn't a big deal.
4760 */
4761 notes_cache_write(driver->textconv_cache);
4762 }
4763
4764 return size;
4765 }
Jonathan Nieder’s miscellaneous git branches