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merge --stat: use the full terminal width
[git/dscho.git] / diff.c
blob74782770bc7068cb3ca7f4dd69ab1045bfdcfa5e
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 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
185
186 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
187 int slot = parse_diff_color_slot(var, 11);
188 if (slot < 0)
189 return 0;
190 if (!value)
191 return config_error_nonbool(var);
192 color_parse(value, var, diff_colors[slot]);
193 return 0;
194 }
195
196 /* like GNU diff's --suppress-blank-empty option */
197 if (!strcmp(var, "diff.suppressblankempty") ||
198 /* for backwards compatibility */
199 !strcmp(var, "diff.suppress-blank-empty")) {
200 diff_suppress_blank_empty = git_config_bool(var, value);
201 return 0;
202 }
203
204 if (!strcmp(var, "diff.dirstat")) {
205 struct strbuf errmsg = STRBUF_INIT;
206 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
207 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
208 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
209 errmsg.buf);
210 strbuf_release(&errmsg);
211 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
212 return 0;
213 }
214
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
217
218 return git_default_config(var, value, cb);
219 }
220
221 static char *quote_two(const char *one, const char *two)
222 {
223 int need_one = quote_c_style(one, NULL, NULL, 1);
224 int need_two = quote_c_style(two, NULL, NULL, 1);
225 struct strbuf res = STRBUF_INIT;
226
227 if (need_one + need_two) {
228 strbuf_addch(&res, '"');
229 quote_c_style(one, &res, NULL, 1);
230 quote_c_style(two, &res, NULL, 1);
231 strbuf_addch(&res, '"');
232 } else {
233 strbuf_addstr(&res, one);
234 strbuf_addstr(&res, two);
235 }
236 return strbuf_detach(&res, NULL);
237 }
238
239 static const char *external_diff(void)
240 {
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
243
244 if (done_preparing)
245 return external_diff_cmd;
246 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
247 if (!external_diff_cmd)
248 external_diff_cmd = external_diff_cmd_cfg;
249 done_preparing = 1;
250 return external_diff_cmd;
251 }
252
253 static struct diff_tempfile {
254 const char *name; /* filename external diff should read from */
255 char hex[41];
256 char mode[10];
257 char tmp_path[PATH_MAX];
258 } diff_temp[2];
259
260 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
261
262 struct emit_callback {
263 int color_diff;
264 unsigned ws_rule;
265 int blank_at_eof_in_preimage;
266 int blank_at_eof_in_postimage;
267 int lno_in_preimage;
268 int lno_in_postimage;
269 sane_truncate_fn truncate;
270 const char **label_path;
271 struct diff_words_data *diff_words;
272 struct diff_options *opt;
273 int *found_changesp;
274 struct strbuf *header;
275 };
276
277 static int count_lines(const char *data, int size)
278 {
279 int count, ch, completely_empty = 1, nl_just_seen = 0;
280 count = 0;
281 while (0 < size--) {
282 ch = *data++;
283 if (ch == '\n') {
284 count++;
285 nl_just_seen = 1;
286 completely_empty = 0;
287 }
288 else {
289 nl_just_seen = 0;
290 completely_empty = 0;
291 }
292 }
293 if (completely_empty)
294 return 0;
295 if (!nl_just_seen)
296 count++; /* no trailing newline */
297 return count;
298 }
299
300 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
301 {
302 if (!DIFF_FILE_VALID(one)) {
303 mf->ptr = (char *)""; /* does not matter */
304 mf->size = 0;
305 return 0;
306 }
307 else if (diff_populate_filespec(one, 0))
308 return -1;
309
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313 }
314
315 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316 static unsigned long diff_filespec_size(struct diff_filespec *one)
317 {
318 if (!DIFF_FILE_VALID(one))
319 return 0;
320 diff_populate_filespec(one, 1);
321 return one->size;
322 }
323
324 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
325 {
326 char *ptr = mf->ptr;
327 long size = mf->size;
328 int cnt = 0;
329
330 if (!size)
331 return cnt;
332 ptr += size - 1; /* pointing at the very end */
333 if (*ptr != '\n')
334 ; /* incomplete line */
335 else
336 ptr--; /* skip the last LF */
337 while (mf->ptr < ptr) {
338 char *prev_eol;
339 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
340 if (*prev_eol == '\n')
341 break;
342 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
343 break;
344 cnt++;
345 ptr = prev_eol - 1;
346 }
347 return cnt;
348 }
349
350 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
351 struct emit_callback *ecbdata)
352 {
353 int l1, l2, at;
354 unsigned ws_rule = ecbdata->ws_rule;
355 l1 = count_trailing_blank(mf1, ws_rule);
356 l2 = count_trailing_blank(mf2, ws_rule);
357 if (l2 <= l1) {
358 ecbdata->blank_at_eof_in_preimage = 0;
359 ecbdata->blank_at_eof_in_postimage = 0;
360 return;
361 }
362 at = count_lines(mf1->ptr, mf1->size);
363 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
364
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367 }
368
369 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
370 int first, const char *line, int len)
371 {
372 int has_trailing_newline, has_trailing_carriage_return;
373 int nofirst;
374 FILE *file = o->file;
375
376 if (o->output_prefix) {
377 struct strbuf *msg = NULL;
378 msg = o->output_prefix(o, o->output_prefix_data);
379 assert(msg);
380 fwrite(msg->buf, msg->len, 1, file);
381 }
382
383 if (len == 0) {
384 has_trailing_newline = (first == '\n');
385 has_trailing_carriage_return = (!has_trailing_newline &&
386 (first == '\r'));
387 nofirst = has_trailing_newline || has_trailing_carriage_return;
388 } else {
389 has_trailing_newline = (len > 0 && line[len-1] == '\n');
390 if (has_trailing_newline)
391 len--;
392 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
393 if (has_trailing_carriage_return)
394 len--;
395 nofirst = 0;
396 }
397
398 if (len || !nofirst) {
399 fputs(set, file);
400 if (!nofirst)
401 fputc(first, file);
402 fwrite(line, len, 1, file);
403 fputs(reset, file);
404 }
405 if (has_trailing_carriage_return)
406 fputc('\r', file);
407 if (has_trailing_newline)
408 fputc('\n', file);
409 }
410
411 static void emit_line(struct diff_options *o, const char *set, const char *reset,
412 const char *line, int len)
413 {
414 emit_line_0(o, set, reset, line[0], line+1, len-1);
415 }
416
417 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
418 {
419 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
420 ecbdata->blank_at_eof_in_preimage &&
421 ecbdata->blank_at_eof_in_postimage &&
422 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
424 return 0;
425 return ws_blank_line(line, len, ecbdata->ws_rule);
426 }
427
428 static void emit_add_line(const char *reset,
429 struct emit_callback *ecbdata,
430 const char *line, int len)
431 {
432 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
433 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
434
435 if (!*ws)
436 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
437 else if (new_blank_line_at_eof(ecbdata, line, len))
438 /* Blank line at EOF - paint '+' as well */
439 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
440 else {
441 /* Emit just the prefix, then the rest. */
442 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
443 ws_check_emit(line, len, ecbdata->ws_rule,
444 ecbdata->opt->file, set, reset, ws);
445 }
446 }
447
448 static void emit_hunk_header(struct emit_callback *ecbdata,
449 const char *line, int len)
450 {
451 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
452 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
453 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
454 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
455 static const char atat[2] = { '@', '@' };
456 const char *cp, *ep;
457 struct strbuf msgbuf = STRBUF_INIT;
458 int org_len = len;
459 int i = 1;
460
461 /*
462 * As a hunk header must begin with "@@ -<old>, +<new> @@",
463 * it always is at least 10 bytes long.
464 */
465 if (len < 10 ||
466 memcmp(line, atat, 2) ||
467 !(ep = memmem(line + 2, len - 2, atat, 2))) {
468 emit_line(ecbdata->opt, plain, reset, line, len);
469 return;
470 }
471 ep += 2; /* skip over @@ */
472
473 /* The hunk header in fraginfo color */
474 strbuf_add(&msgbuf, frag, strlen(frag));
475 strbuf_add(&msgbuf, line, ep - line);
476 strbuf_add(&msgbuf, reset, strlen(reset));
477
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
484
485 /* blank before the func header */
486 for (cp = ep; ep - line < len; ep++)
487 if (*ep != ' ' && *ep != '\t')
488 break;
489 if (ep != cp) {
490 strbuf_add(&msgbuf, plain, strlen(plain));
491 strbuf_add(&msgbuf, cp, ep - cp);
492 strbuf_add(&msgbuf, reset, strlen(reset));
493 }
494
495 if (ep < line + len) {
496 strbuf_add(&msgbuf, func, strlen(func));
497 strbuf_add(&msgbuf, ep, line + len - ep);
498 strbuf_add(&msgbuf, reset, strlen(reset));
499 }
500
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504 }
505
506 static struct diff_tempfile *claim_diff_tempfile(void) {
507 int i;
508 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
509 if (!diff_temp[i].name)
510 return diff_temp + i;
511 die("BUG: diff is failing to clean up its tempfiles");
512 }
513
514 static int remove_tempfile_installed;
515
516 static void remove_tempfile(void)
517 {
518 int i;
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
520 if (diff_temp[i].name == diff_temp[i].tmp_path)
521 unlink_or_warn(diff_temp[i].name);
522 diff_temp[i].name = NULL;
523 }
524 }
525
526 static void remove_tempfile_on_signal(int signo)
527 {
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531 }
532
533 static void print_line_count(FILE *file, int count)
534 {
535 switch (count) {
536 case 0:
537 fprintf(file, "0,0");
538 break;
539 case 1:
540 fprintf(file, "1");
541 break;
542 default:
543 fprintf(file, "1,%d", count);
544 break;
545 }
546 }
547
548 static void emit_rewrite_lines(struct emit_callback *ecb,
549 int prefix, const char *data, int size)
550 {
551 const char *endp = NULL;
552 static const char *nneof = " No newline at end of file\n";
553 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
554 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
555
556 while (0 < size) {
557 int len;
558
559 endp = memchr(data, '\n', size);
560 len = endp ? (endp - data + 1) : size;
561 if (prefix != '+') {
562 ecb->lno_in_preimage++;
563 emit_line_0(ecb->opt, old, reset, '-',
564 data, len);
565 } else {
566 ecb->lno_in_postimage++;
567 emit_add_line(reset, ecb, data, len);
568 }
569 size -= len;
570 data += len;
571 }
572 if (!endp) {
573 const char *plain = diff_get_color(ecb->color_diff,
574 DIFF_PLAIN);
575 emit_line_0(ecb->opt, plain, reset, '\\',
576 nneof, strlen(nneof));
577 }
578 }
579
580 static void emit_rewrite_diff(const char *name_a,
581 const char *name_b,
582 struct diff_filespec *one,
583 struct diff_filespec *two,
584 struct userdiff_driver *textconv_one,
585 struct userdiff_driver *textconv_two,
586 struct diff_options *o)
587 {
588 int lc_a, lc_b;
589 const char *name_a_tab, *name_b_tab;
590 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
591 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
592 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
593 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
594 const char *a_prefix, *b_prefix;
595 char *data_one, *data_two;
596 size_t size_one, size_two;
597 struct emit_callback ecbdata;
598 char *line_prefix = "";
599 struct strbuf *msgbuf;
600
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
605
606 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
607 a_prefix = o->b_prefix;
608 b_prefix = o->a_prefix;
609 } else {
610 a_prefix = o->a_prefix;
611 b_prefix = o->b_prefix;
612 }
613
614 name_a += (*name_a == '/');
615 name_b += (*name_b == '/');
616 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
617 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
618
619 strbuf_reset(&a_name);
620 strbuf_reset(&b_name);
621 quote_two_c_style(&a_name, a_prefix, name_a, 0);
622 quote_two_c_style(&b_name, b_prefix, name_b, 0);
623
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
626
627 memset(&ecbdata, 0, sizeof(ecbdata));
628 ecbdata.color_diff = want_color(o->use_color);
629 ecbdata.found_changesp = &o->found_changes;
630 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
631 ecbdata.opt = o;
632 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
633 mmfile_t mf1, mf2;
634 mf1.ptr = (char *)data_one;
635 mf2.ptr = (char *)data_two;
636 mf1.size = size_one;
637 mf2.size = size_two;
638 check_blank_at_eof(&mf1, &mf2, &ecbdata);
639 }
640 ecbdata.lno_in_preimage = 1;
641 ecbdata.lno_in_postimage = 1;
642
643 lc_a = count_lines(data_one, size_one);
644 lc_b = count_lines(data_two, size_two);
645 fprintf(o->file,
646 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
647 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
648 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
649 line_prefix, fraginfo);
650 if (!o->irreversible_delete)
651 print_line_count(o->file, lc_a);
652 else
653 fprintf(o->file, "?,?");
654 fprintf(o->file, " +");
655 print_line_count(o->file, lc_b);
656 fprintf(o->file, " @@%s\n", reset);
657 if (lc_a && !o->irreversible_delete)
658 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
659 if (lc_b)
660 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
661 if (textconv_one)
662 free((char *)data_one);
663 if (textconv_two)
664 free((char *)data_two);
665 }
666
667 struct diff_words_buffer {
668 mmfile_t text;
669 long alloc;
670 struct diff_words_orig {
671 const char *begin, *end;
672 } *orig;
673 int orig_nr, orig_alloc;
674 };
675
676 static void diff_words_append(char *line, unsigned long len,
677 struct diff_words_buffer *buffer)
678 {
679 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
680 line++;
681 len--;
682 memcpy(buffer->text.ptr + buffer->text.size, line, len);
683 buffer->text.size += len;
684 buffer->text.ptr[buffer->text.size] = '\0';
685 }
686
687 struct diff_words_style_elem {
688 const char *prefix;
689 const char *suffix;
690 const char *color; /* NULL; filled in by the setup code if
691 * color is enabled */
692 };
693
694 struct diff_words_style {
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698 };
699
700 static struct diff_words_style diff_words_styles[] = {
701 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
702 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
703 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
704 };
705
706 struct diff_words_data {
707 struct diff_words_buffer minus, plus;
708 const char *current_plus;
709 int last_minus;
710 struct diff_options *opt;
711 regex_t *word_regex;
712 enum diff_words_type type;
713 struct diff_words_style *style;
714 };
715
716 static int fn_out_diff_words_write_helper(FILE *fp,
717 struct diff_words_style_elem *st_el,
718 const char *newline,
719 size_t count, const char *buf,
720 const char *line_prefix)
721 {
722 int print = 0;
723
724 while (count) {
725 char *p = memchr(buf, '\n', count);
726 if (print)
727 fputs(line_prefix, fp);
728 if (p != buf) {
729 if (st_el->color && fputs(st_el->color, fp) < 0)
730 return -1;
731 if (fputs(st_el->prefix, fp) < 0 ||
732 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
733 fputs(st_el->suffix, fp) < 0)
734 return -1;
735 if (st_el->color && *st_el->color
736 && fputs(GIT_COLOR_RESET, fp) < 0)
737 return -1;
738 }
739 if (!p)
740 return 0;
741 if (fputs(newline, fp) < 0)
742 return -1;
743 count -= p + 1 - buf;
744 buf = p + 1;
745 print = 1;
746 }
747 return 0;
748 }
749
750 /*
751 * '--color-words' algorithm can be described as:
752 *
753 * 1. collect a the minus/plus lines of a diff hunk, divided into
754 * minus-lines and plus-lines;
755 *
756 * 2. break both minus-lines and plus-lines into words and
757 * place them into two mmfile_t with one word for each line;
758 *
759 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
760 *
761 * And for the common parts of the both file, we output the plus side text.
762 * diff_words->current_plus is used to trace the current position of the plus file
763 * which printed. diff_words->last_minus is used to trace the last minus word
764 * printed.
765 *
766 * For '--graph' to work with '--color-words', we need to output the graph prefix
767 * on each line of color words output. Generally, there are two conditions on
768 * which we should output the prefix.
769 *
770 * 1. diff_words->last_minus == 0 &&
771 * diff_words->current_plus == diff_words->plus.text.ptr
772 *
773 * that is: the plus text must start as a new line, and if there is no minus
774 * word printed, a graph prefix must be printed.
775 *
776 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
777 * *(diff_words->current_plus - 1) == '\n'
778 *
779 * that is: a graph prefix must be printed following a '\n'
780 */
781 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
782 {
783 if ((diff_words->last_minus == 0 &&
784 diff_words->current_plus == diff_words->plus.text.ptr) ||
785 (diff_words->current_plus > diff_words->plus.text.ptr &&
786 *(diff_words->current_plus - 1) == '\n')) {
787 return 1;
788 } else {
789 return 0;
790 }
791 }
792
793 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
794 {
795 struct diff_words_data *diff_words = priv;
796 struct diff_words_style *style = diff_words->style;
797 int minus_first, minus_len, plus_first, plus_len;
798 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
799 struct diff_options *opt = diff_words->opt;
800 struct strbuf *msgbuf;
801 char *line_prefix = "";
802
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
806
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
812
813 /* POSIX requires that first be decremented by one if len == 0... */
814 if (minus_len) {
815 minus_begin = diff_words->minus.orig[minus_first].begin;
816 minus_end =
817 diff_words->minus.orig[minus_first + minus_len - 1].end;
818 } else
819 minus_begin = minus_end =
820 diff_words->minus.orig[minus_first].end;
821
822 if (plus_len) {
823 plus_begin = diff_words->plus.orig[plus_first].begin;
824 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
825 } else
826 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
827
828 if (color_words_output_graph_prefix(diff_words)) {
829 fputs(line_prefix, diff_words->opt->file);
830 }
831 if (diff_words->current_plus != plus_begin) {
832 fn_out_diff_words_write_helper(diff_words->opt->file,
833 &style->ctx, style->newline,
834 plus_begin - diff_words->current_plus,
835 diff_words->current_plus, line_prefix);
836 if (*(plus_begin - 1) == '\n')
837 fputs(line_prefix, diff_words->opt->file);
838 }
839 if (minus_begin != minus_end) {
840 fn_out_diff_words_write_helper(diff_words->opt->file,
841 &style->old, style->newline,
842 minus_end - minus_begin, minus_begin,
843 line_prefix);
844 }
845 if (plus_begin != plus_end) {
846 fn_out_diff_words_write_helper(diff_words->opt->file,
847 &style->new, style->newline,
848 plus_end - plus_begin, plus_begin,
849 line_prefix);
850 }
851
852 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854 }
855
856 /* This function starts looking at *begin, and returns 0 iff a word was found. */
857 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
858 int *begin, int *end)
859 {
860 if (word_regex && *begin < buffer->size) {
861 regmatch_t match[1];
862 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
863 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
864 '\n', match[0].rm_eo - match[0].rm_so);
865 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
866 *begin += match[0].rm_so;
867 return *begin >= *end;
868 }
869 return -1;
870 }
871
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
877
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
882
883 return 0;
884 }
885
886 /*
887 * This function splits the words in buffer->text, stores the list with
888 * newline separator into out, and saves the offsets of the original words
889 * in buffer->orig.
890 */
891 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
892 regex_t *word_regex)
893 {
894 int i, j;
895 long alloc = 0;
896
897 out->size = 0;
898 out->ptr = NULL;
899
900 /* fake an empty "0th" word */
901 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
902 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
903 buffer->orig_nr = 1;
904
905 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
908
909 /* store original boundaries */
910 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
911 buffer->orig_alloc);
912 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
913 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
914 buffer->orig_nr++;
915
916 /* store one word */
917 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
918 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
919 out->ptr[out->size + j - i] = '\n';
920 out->size += j - i + 1;
921
922 i = j - 1;
923 }
924 }
925
926 /* this executes the word diff on the accumulated buffers */
927 static void diff_words_show(struct diff_words_data *diff_words)
928 {
929 xpparam_t xpp;
930 xdemitconf_t xecfg;
931 mmfile_t minus, plus;
932 struct diff_words_style *style = diff_words->style;
933
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
937
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
943
944 /* special case: only removal */
945 if (!diff_words->plus.text.size) {
946 fputs(line_prefix, diff_words->opt->file);
947 fn_out_diff_words_write_helper(diff_words->opt->file,
948 &style->old, style->newline,
949 diff_words->minus.text.size,
950 diff_words->minus.text.ptr, line_prefix);
951 diff_words->minus.text.size = 0;
952 return;
953 }
954
955 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
957
958 memset(&xpp, 0, sizeof(xpp));
959 memset(&xecfg, 0, sizeof(xecfg));
960 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
961 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
962 xpp.flags = 0;
963 /* as only the hunk header will be parsed, we need a 0-context */
964 xecfg.ctxlen = 0;
965 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
966 &xpp, &xecfg);
967 free(minus.ptr);
968 free(plus.ptr);
969 if (diff_words->current_plus != diff_words->plus.text.ptr +
970 diff_words->plus.text.size) {
971 if (color_words_output_graph_prefix(diff_words))
972 fputs(line_prefix, diff_words->opt->file);
973 fn_out_diff_words_write_helper(diff_words->opt->file,
974 &style->ctx, style->newline,
975 diff_words->plus.text.ptr + diff_words->plus.text.size
976 - diff_words->current_plus, diff_words->current_plus,
977 line_prefix);
978 }
979 diff_words->minus.text.size = diff_words->plus.text.size = 0;
980 }
981
982 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
983 static void diff_words_flush(struct emit_callback *ecbdata)
984 {
985 if (ecbdata->diff_words->minus.text.size ||
986 ecbdata->diff_words->plus.text.size)
987 diff_words_show(ecbdata->diff_words);
988 }
989
990 static void free_diff_words_data(struct emit_callback *ecbdata)
991 {
992 if (ecbdata->diff_words) {
993 diff_words_flush(ecbdata);
994 free (ecbdata->diff_words->minus.text.ptr);
995 free (ecbdata->diff_words->minus.orig);
996 free (ecbdata->diff_words->plus.text.ptr);
997 free (ecbdata->diff_words->plus.orig);
998 if (ecbdata->diff_words->word_regex) {
999 regfree(ecbdata->diff_words->word_regex);
1000 free(ecbdata->diff_words->word_regex);
1001 }
1002 free(ecbdata->diff_words);
1003 ecbdata->diff_words = NULL;
1004 }
1005 }
1006
1007 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1008 {
1009 if (want_color(diff_use_color))
1010 return diff_colors[ix];
1011 return "";
1012 }
1013
1014 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1015 {
1016 const char *cp;
1017 unsigned long allot;
1018 size_t l = len;
1019
1020 if (ecb->truncate)
1021 return ecb->truncate(line, len);
1022 cp = line;
1023 allot = l;
1024 while (0 < l) {
1025 (void) utf8_width(&cp, &l);
1026 if (!cp)
1027 break; /* truncated in the middle? */
1028 }
1029 return allot - l;
1030 }
1031
1032 static void find_lno(const char *line, struct emit_callback *ecbdata)
1033 {
1034 const char *p;
1035 ecbdata->lno_in_preimage = 0;
1036 ecbdata->lno_in_postimage = 0;
1037 p = strchr(line, '-');
1038 if (!p)
1039 return; /* cannot happen */
1040 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1041 p = strchr(p, '+');
1042 if (!p)
1043 return; /* cannot happen */
1044 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1045 }
1046
1047 static void fn_out_consume(void *priv, char *line, unsigned long len)
1048 {
1049 struct emit_callback *ecbdata = priv;
1050 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1051 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1052 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1053 struct diff_options *o = ecbdata->opt;
1054 char *line_prefix = "";
1055 struct strbuf *msgbuf;
1056
1057 if (o && o->output_prefix) {
1058 msgbuf = o->output_prefix(o, o->output_prefix_data);
1059 line_prefix = msgbuf->buf;
1060 }
1061
1062 if (ecbdata->header) {
1063 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1064 strbuf_reset(ecbdata->header);
1065 ecbdata->header = NULL;
1066 }
1067 *(ecbdata->found_changesp) = 1;
1068
1069 if (ecbdata->label_path[0]) {
1070 const char *name_a_tab, *name_b_tab;
1071
1072 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1073 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1074
1075 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1077 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1078 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1079 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1080 }
1081
1082 if (diff_suppress_blank_empty
1083 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1084 line[0] = '\n';
1085 len = 1;
1086 }
1087
1088 if (line[0] == '@') {
1089 if (ecbdata->diff_words)
1090 diff_words_flush(ecbdata);
1091 len = sane_truncate_line(ecbdata, line, len);
1092 find_lno(line, ecbdata);
1093 emit_hunk_header(ecbdata, line, len);
1094 if (line[len-1] != '\n')
1095 putc('\n', ecbdata->opt->file);
1096 return;
1097 }
1098
1099 if (len < 1) {
1100 emit_line(ecbdata->opt, reset, reset, line, len);
1101 if (ecbdata->diff_words
1102 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1103 fputs("~\n", ecbdata->opt->file);
1104 return;
1105 }
1106
1107 if (ecbdata->diff_words) {
1108 if (line[0] == '-') {
1109 diff_words_append(line, len,
1110 &ecbdata->diff_words->minus);
1111 return;
1112 } else if (line[0] == '+') {
1113 diff_words_append(line, len,
1114 &ecbdata->diff_words->plus);
1115 return;
1116 } else if (!prefixcmp(line, "\\ ")) {
1117 /*
1118 * Eat the "no newline at eof" marker as if we
1119 * saw a "+" or "-" line with nothing on it,
1120 * and return without diff_words_flush() to
1121 * defer processing. If this is the end of
1122 * preimage, more "+" lines may come after it.
1123 */
1124 return;
1125 }
1126 diff_words_flush(ecbdata);
1127 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1128 emit_line(ecbdata->opt, plain, reset, line, len);
1129 fputs("~\n", ecbdata->opt->file);
1130 } else {
1131 /*
1132 * Skip the prefix character, if any. With
1133 * diff_suppress_blank_empty, there may be
1134 * none.
1135 */
1136 if (line[0] != '\n') {
1137 line++;
1138 len--;
1139 }
1140 emit_line(ecbdata->opt, plain, reset, line, len);
1141 }
1142 return;
1143 }
1144
1145 if (line[0] != '+') {
1146 const char *color =
1147 diff_get_color(ecbdata->color_diff,
1148 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1149 ecbdata->lno_in_preimage++;
1150 if (line[0] == ' ')
1151 ecbdata->lno_in_postimage++;
1152 emit_line(ecbdata->opt, color, reset, line, len);
1153 } else {
1154 ecbdata->lno_in_postimage++;
1155 emit_add_line(reset, ecbdata, line + 1, len - 1);
1156 }
1157 }
1158
1159 static char *pprint_rename(const char *a, const char *b)
1160 {
1161 const char *old = a;
1162 const char *new = b;
1163 struct strbuf name = STRBUF_INIT;
1164 int pfx_length, sfx_length;
1165 int len_a = strlen(a);
1166 int len_b = strlen(b);
1167 int a_midlen, b_midlen;
1168 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1169 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1170
1171 if (qlen_a || qlen_b) {
1172 quote_c_style(a, &name, NULL, 0);
1173 strbuf_addstr(&name, " => ");
1174 quote_c_style(b, &name, NULL, 0);
1175 return strbuf_detach(&name, NULL);
1176 }
1177
1178 /* Find common prefix */
1179 pfx_length = 0;
1180 while (*old && *new && *old == *new) {
1181 if (*old == '/')
1182 pfx_length = old - a + 1;
1183 old++;
1184 new++;
1185 }
1186
1187 /* Find common suffix */
1188 old = a + len_a;
1189 new = b + len_b;
1190 sfx_length = 0;
1191 while (a <= old && b <= new && *old == *new) {
1192 if (*old == '/')
1193 sfx_length = len_a - (old - a);
1194 old--;
1195 new--;
1196 }
1197
1198 /*
1199 * pfx{mid-a => mid-b}sfx
1200 * {pfx-a => pfx-b}sfx
1201 * pfx{sfx-a => sfx-b}
1202 * name-a => name-b
1203 */
1204 a_midlen = len_a - pfx_length - sfx_length;
1205 b_midlen = len_b - pfx_length - sfx_length;
1206 if (a_midlen < 0)
1207 a_midlen = 0;
1208 if (b_midlen < 0)
1209 b_midlen = 0;
1210
1211 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1212 if (pfx_length + sfx_length) {
1213 strbuf_add(&name, a, pfx_length);
1214 strbuf_addch(&name, '{');
1215 }
1216 strbuf_add(&name, a + pfx_length, a_midlen);
1217 strbuf_addstr(&name, " => ");
1218 strbuf_add(&name, b + pfx_length, b_midlen);
1219 if (pfx_length + sfx_length) {
1220 strbuf_addch(&name, '}');
1221 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1222 }
1223 return strbuf_detach(&name, NULL);
1224 }
1225
1226 struct diffstat_t {
1227 int nr;
1228 int alloc;
1229 struct diffstat_file {
1230 char *from_name;
1231 char *name;
1232 char *print_name;
1233 unsigned is_unmerged:1;
1234 unsigned is_binary:1;
1235 unsigned is_renamed:1;
1236 uintmax_t added, deleted;
1237 } **files;
1238 };
1239
1240 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1241 const char *name_a,
1242 const char *name_b)
1243 {
1244 struct diffstat_file *x;
1245 x = xcalloc(sizeof (*x), 1);
1246 if (diffstat->nr == diffstat->alloc) {
1247 diffstat->alloc = alloc_nr(diffstat->alloc);
1248 diffstat->files = xrealloc(diffstat->files,
1249 diffstat->alloc * sizeof(x));
1250 }
1251 diffstat->files[diffstat->nr++] = x;
1252 if (name_b) {
1253 x->from_name = xstrdup(name_a);
1254 x->name = xstrdup(name_b);
1255 x->is_renamed = 1;
1256 }
1257 else {
1258 x->from_name = NULL;
1259 x->name = xstrdup(name_a);
1260 }
1261 return x;
1262 }
1263
1264 static void diffstat_consume(void *priv, char *line, unsigned long len)
1265 {
1266 struct diffstat_t *diffstat = priv;
1267 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1268
1269 if (line[0] == '+')
1270 x->added++;
1271 else if (line[0] == '-')
1272 x->deleted++;
1273 }
1274
1275 const char mime_boundary_leader[] = "------------";
1276
1277 static int scale_linear(int it, int width, int max_change)
1278 {
1279 if (!it)
1280 return 0;
1281 /*
1282 * make sure that at least one '-' or '+' is printed if
1283 * there is any change to this path. The easiest way is to
1284 * scale linearly as if the alloted width is one column shorter
1285 * than it is, and then add 1 to the result.
1286 */
1287 return 1 + (it * (width - 1) / max_change);
1288 }
1289
1290 static void show_name(FILE *file,
1291 const char *prefix, const char *name, int len)
1292 {
1293 fprintf(file, " %s%-*s |", prefix, len, name);
1294 }
1295
1296 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1297 {
1298 if (cnt <= 0)
1299 return;
1300 fprintf(file, "%s", set);
1301 while (cnt--)
1302 putc(ch, file);
1303 fprintf(file, "%s", reset);
1304 }
1305
1306 static void fill_print_name(struct diffstat_file *file)
1307 {
1308 char *pname;
1309
1310 if (file->print_name)
1311 return;
1312
1313 if (!file->is_renamed) {
1314 struct strbuf buf = STRBUF_INIT;
1315 if (quote_c_style(file->name, &buf, NULL, 0)) {
1316 pname = strbuf_detach(&buf, NULL);
1317 } else {
1318 pname = file->name;
1319 strbuf_release(&buf);
1320 }
1321 } else {
1322 pname = pprint_rename(file->from_name, file->name);
1323 }
1324 file->print_name = pname;
1325 }
1326
1327 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1328 {
1329 int i, len, add, del, adds = 0, dels = 0;
1330 uintmax_t max_change = 0, max_len = 0;
1331 int total_files = data->nr;
1332 int width, name_width, count;
1333 const char *reset, *add_c, *del_c;
1334 const char *line_prefix = "";
1335 int extra_shown = 0;
1336 struct strbuf *msg = NULL;
1337
1338 if (data->nr == 0)
1339 return;
1340
1341 if (options->output_prefix) {
1342 msg = options->output_prefix(options, options->output_prefix_data);
1343 line_prefix = msg->buf;
1344 }
1345
1346 if (options->stat_width == -1)
1347 width = term_columns();
1348 else
1349 width = options->stat_width ? options->stat_width : 80;
1350 name_width = options->stat_name_width ? options->stat_name_width : 50;
1351 count = options->stat_count ? options->stat_count : data->nr;
1352
1353 /* Sanity: give at least 5 columns to the graph,
1354 * but leave at least 10 columns for the name.
1355 */
1356 if (width < 25)
1357 width = 25;
1358 if (name_width < 10)
1359 name_width = 10;
1360 else if (width < name_width + 15)
1361 name_width = width - 15;
1362
1363 /* Find the longest filename and max number of changes */
1364 reset = diff_get_color_opt(options, DIFF_RESET);
1365 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1366 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1367
1368 for (i = 0; (i < count) && (i < data->nr); i++) {
1369 struct diffstat_file *file = data->files[i];
1370 uintmax_t change = file->added + file->deleted;
1371 if (!data->files[i]->is_renamed &&
1372 (change == 0)) {
1373 count++; /* not shown == room for one more */
1374 continue;
1375 }
1376 fill_print_name(file);
1377 len = strlen(file->print_name);
1378 if (max_len < len)
1379 max_len = len;
1380
1381 if (file->is_binary || file->is_unmerged)
1382 continue;
1383 if (max_change < change)
1384 max_change = change;
1385 }
1386 count = i; /* min(count, data->nr) */
1387
1388 /* Compute the width of the graph part;
1389 * 10 is for one blank at the beginning of the line plus
1390 * " | count " between the name and the graph.
1391 *
1392 * From here on, name_width is the width of the name area,
1393 * and width is the width of the graph area.
1394 */
1395 name_width = (name_width < max_len) ? name_width : max_len;
1396 if (width < (name_width + 10) + max_change)
1397 width = width - (name_width + 10);
1398 else
1399 width = max_change;
1400
1401 for (i = 0; i < count; i++) {
1402 const char *prefix = "";
1403 char *name = data->files[i]->print_name;
1404 uintmax_t added = data->files[i]->added;
1405 uintmax_t deleted = data->files[i]->deleted;
1406 int name_len;
1407
1408 if (!data->files[i]->is_renamed &&
1409 (added + deleted == 0)) {
1410 total_files--;
1411 continue;
1412 }
1413 /*
1414 * "scale" the filename
1415 */
1416 len = name_width;
1417 name_len = strlen(name);
1418 if (name_width < name_len) {
1419 char *slash;
1420 prefix = "...";
1421 len -= 3;
1422 name += name_len - len;
1423 slash = strchr(name, '/');
1424 if (slash)
1425 name = slash;
1426 }
1427
1428 if (data->files[i]->is_binary) {
1429 fprintf(options->file, "%s", line_prefix);
1430 show_name(options->file, prefix, name, len);
1431 fprintf(options->file, " Bin ");
1432 fprintf(options->file, "%s%"PRIuMAX"%s",
1433 del_c, deleted, reset);
1434 fprintf(options->file, " -> ");
1435 fprintf(options->file, "%s%"PRIuMAX"%s",
1436 add_c, added, reset);
1437 fprintf(options->file, " bytes");
1438 fprintf(options->file, "\n");
1439 continue;
1440 }
1441 else if (data->files[i]->is_unmerged) {
1442 fprintf(options->file, "%s", line_prefix);
1443 show_name(options->file, prefix, name, len);
1444 fprintf(options->file, " Unmerged\n");
1445 continue;
1446 }
1447
1448 /*
1449 * scale the add/delete
1450 */
1451 add = added;
1452 del = deleted;
1453 adds += add;
1454 dels += del;
1455
1456 if (width <= max_change) {
1457 int total = add + del;
1458
1459 total = scale_linear(add + del, width, max_change);
1460 if (total < 2 && add && del)
1461 /* width >= 2 due to the sanity check */
1462 total = 2;
1463 if (add < del) {
1464 add = scale_linear(add, width, max_change);
1465 del = total - add;
1466 } else {
1467 del = scale_linear(del, width, max_change);
1468 add = total - del;
1469 }
1470 }
1471 fprintf(options->file, "%s", line_prefix);
1472 show_name(options->file, prefix, name, len);
1473 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1474 added + deleted ? " " : "");
1475 show_graph(options->file, '+', add, add_c, reset);
1476 show_graph(options->file, '-', del, del_c, reset);
1477 fprintf(options->file, "\n");
1478 }
1479 for (i = count; i < data->nr; i++) {
1480 uintmax_t added = data->files[i]->added;
1481 uintmax_t deleted = data->files[i]->deleted;
1482 if (!data->files[i]->is_renamed &&
1483 (added + deleted == 0)) {
1484 total_files--;
1485 continue;
1486 }
1487 adds += added;
1488 dels += deleted;
1489 if (!extra_shown)
1490 fprintf(options->file, "%s ...\n", line_prefix);
1491 extra_shown = 1;
1492 }
1493 fprintf(options->file, "%s", line_prefix);
1494 fprintf(options->file,
1495 " %d files changed, %d insertions(+), %d deletions(-)\n",
1496 total_files, adds, dels);
1497 }
1498
1499 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1500 {
1501 int i, adds = 0, dels = 0, total_files = data->nr;
1502
1503 if (data->nr == 0)
1504 return;
1505
1506 for (i = 0; i < data->nr; i++) {
1507 if (!data->files[i]->is_binary &&
1508 !data->files[i]->is_unmerged) {
1509 int added = data->files[i]->added;
1510 int deleted= data->files[i]->deleted;
1511 if (!data->files[i]->is_renamed &&
1512 (added + deleted == 0)) {
1513 total_files--;
1514 } else {
1515 adds += added;
1516 dels += deleted;
1517 }
1518 }
1519 }
1520 if (options->output_prefix) {
1521 struct strbuf *msg = NULL;
1522 msg = options->output_prefix(options,
1523 options->output_prefix_data);
1524 fprintf(options->file, "%s", msg->buf);
1525 }
1526 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1527 total_files, adds, dels);
1528 }
1529
1530 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1531 {
1532 int i;
1533
1534 if (data->nr == 0)
1535 return;
1536
1537 for (i = 0; i < data->nr; i++) {
1538 struct diffstat_file *file = data->files[i];
1539
1540 if (options->output_prefix) {
1541 struct strbuf *msg = NULL;
1542 msg = options->output_prefix(options,
1543 options->output_prefix_data);
1544 fprintf(options->file, "%s", msg->buf);
1545 }
1546
1547 if (file->is_binary)
1548 fprintf(options->file, "-\t-\t");
1549 else
1550 fprintf(options->file,
1551 "%"PRIuMAX"\t%"PRIuMAX"\t",
1552 file->added, file->deleted);
1553 if (options->line_termination) {
1554 fill_print_name(file);
1555 if (!file->is_renamed)
1556 write_name_quoted(file->name, options->file,
1557 options->line_termination);
1558 else {
1559 fputs(file->print_name, options->file);
1560 putc(options->line_termination, options->file);
1561 }
1562 } else {
1563 if (file->is_renamed) {
1564 putc('\0', options->file);
1565 write_name_quoted(file->from_name, options->file, '\0');
1566 }
1567 write_name_quoted(file->name, options->file, '\0');
1568 }
1569 }
1570 }
1571
1572 struct dirstat_file {
1573 const char *name;
1574 unsigned long changed;
1575 };
1576
1577 struct dirstat_dir {
1578 struct dirstat_file *files;
1579 int alloc, nr, permille, cumulative;
1580 };
1581
1582 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1583 unsigned long changed, const char *base, int baselen)
1584 {
1585 unsigned long this_dir = 0;
1586 unsigned int sources = 0;
1587 const char *line_prefix = "";
1588 struct strbuf *msg = NULL;
1589
1590 if (opt->output_prefix) {
1591 msg = opt->output_prefix(opt, opt->output_prefix_data);
1592 line_prefix = msg->buf;
1593 }
1594
1595 while (dir->nr) {
1596 struct dirstat_file *f = dir->files;
1597 int namelen = strlen(f->name);
1598 unsigned long this;
1599 char *slash;
1600
1601 if (namelen < baselen)
1602 break;
1603 if (memcmp(f->name, base, baselen))
1604 break;
1605 slash = strchr(f->name + baselen, '/');
1606 if (slash) {
1607 int newbaselen = slash + 1 - f->name;
1608 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1609 sources++;
1610 } else {
1611 this = f->changed;
1612 dir->files++;
1613 dir->nr--;
1614 sources += 2;
1615 }
1616 this_dir += this;
1617 }
1618
1619 /*
1620 * We don't report dirstat's for
1621 * - the top level
1622 * - or cases where everything came from a single directory
1623 * under this directory (sources == 1).
1624 */
1625 if (baselen && sources != 1) {
1626 if (this_dir) {
1627 int permille = this_dir * 1000 / changed;
1628 if (permille >= dir->permille) {
1629 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1630 permille / 10, permille % 10, baselen, base);
1631 if (!dir->cumulative)
1632 return 0;
1633 }
1634 }
1635 }
1636 return this_dir;
1637 }
1638
1639 static int dirstat_compare(const void *_a, const void *_b)
1640 {
1641 const struct dirstat_file *a = _a;
1642 const struct dirstat_file *b = _b;
1643 return strcmp(a->name, b->name);
1644 }
1645
1646 static void show_dirstat(struct diff_options *options)
1647 {
1648 int i;
1649 unsigned long changed;
1650 struct dirstat_dir dir;
1651 struct diff_queue_struct *q = &diff_queued_diff;
1652
1653 dir.files = NULL;
1654 dir.alloc = 0;
1655 dir.nr = 0;
1656 dir.permille = options->dirstat_permille;
1657 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1658
1659 changed = 0;
1660 for (i = 0; i < q->nr; i++) {
1661 struct diff_filepair *p = q->queue[i];
1662 const char *name;
1663 unsigned long copied, added, damage;
1664 int content_changed;
1665
1666 name = p->two->path ? p->two->path : p->one->path;
1667
1668 if (p->one->sha1_valid && p->two->sha1_valid)
1669 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1670 else
1671 content_changed = 1;
1672
1673 if (!content_changed) {
1674 /*
1675 * The SHA1 has not changed, so pre-/post-content is
1676 * identical. We can therefore skip looking at the
1677 * file contents altogether.
1678 */
1679 damage = 0;
1680 goto found_damage;
1681 }
1682
1683 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1684 /*
1685 * In --dirstat-by-file mode, we don't really need to
1686 * look at the actual file contents at all.
1687 * The fact that the SHA1 changed is enough for us to
1688 * add this file to the list of results
1689 * (with each file contributing equal damage).
1690 */
1691 damage = 1;
1692 goto found_damage;
1693 }
1694
1695 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1696 diff_populate_filespec(p->one, 0);
1697 diff_populate_filespec(p->two, 0);
1698 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1699 &copied, &added);
1700 diff_free_filespec_data(p->one);
1701 diff_free_filespec_data(p->two);
1702 } else if (DIFF_FILE_VALID(p->one)) {
1703 diff_populate_filespec(p->one, 1);
1704 copied = added = 0;
1705 diff_free_filespec_data(p->one);
1706 } else if (DIFF_FILE_VALID(p->two)) {
1707 diff_populate_filespec(p->two, 1);
1708 copied = 0;
1709 added = p->two->size;
1710 diff_free_filespec_data(p->two);
1711 } else
1712 continue;
1713
1714 /*
1715 * Original minus copied is the removed material,
1716 * added is the new material. They are both damages
1717 * made to the preimage.
1718 * If the resulting damage is zero, we know that
1719 * diffcore_count_changes() considers the two entries to
1720 * be identical, but since content_changed is true, we
1721 * know that there must have been _some_ kind of change,
1722 * so we force all entries to have damage > 0.
1723 */
1724 damage = (p->one->size - copied) + added;
1725 if (!damage)
1726 damage = 1;
1727
1728 found_damage:
1729 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1730 dir.files[dir.nr].name = name;
1731 dir.files[dir.nr].changed = damage;
1732 changed += damage;
1733 dir.nr++;
1734 }
1735
1736 /* This can happen even with many files, if everything was renames */
1737 if (!changed)
1738 return;
1739
1740 /* Show all directories with more than x% of the changes */
1741 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1742 gather_dirstat(options, &dir, changed, "", 0);
1743 }
1744
1745 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1746 {
1747 int i;
1748 unsigned long changed;
1749 struct dirstat_dir dir;
1750
1751 if (data->nr == 0)
1752 return;
1753
1754 dir.files = NULL;
1755 dir.alloc = 0;
1756 dir.nr = 0;
1757 dir.permille = options->dirstat_permille;
1758 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1759
1760 changed = 0;
1761 for (i = 0; i < data->nr; i++) {
1762 struct diffstat_file *file = data->files[i];
1763 unsigned long damage = file->added + file->deleted;
1764 if (file->is_binary)
1765 /*
1766 * binary files counts bytes, not lines. Must find some
1767 * way to normalize binary bytes vs. textual lines.
1768 * The following heuristic assumes that there are 64
1769 * bytes per "line".
1770 * This is stupid and ugly, but very cheap...
1771 */
1772 damage = (damage + 63) / 64;
1773 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1774 dir.files[dir.nr].name = file->name;
1775 dir.files[dir.nr].changed = damage;
1776 changed += damage;
1777 dir.nr++;
1778 }
1779
1780 /* This can happen even with many files, if everything was renames */
1781 if (!changed)
1782 return;
1783
1784 /* Show all directories with more than x% of the changes */
1785 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1786 gather_dirstat(options, &dir, changed, "", 0);
1787 }
1788
1789 static void free_diffstat_info(struct diffstat_t *diffstat)
1790 {
1791 int i;
1792 for (i = 0; i < diffstat->nr; i++) {
1793 struct diffstat_file *f = diffstat->files[i];
1794 if (f->name != f->print_name)
1795 free(f->print_name);
1796 free(f->name);
1797 free(f->from_name);
1798 free(f);
1799 }
1800 free(diffstat->files);
1801 }
1802
1803 struct checkdiff_t {
1804 const char *filename;
1805 int lineno;
1806 int conflict_marker_size;
1807 struct diff_options *o;
1808 unsigned ws_rule;
1809 unsigned status;
1810 };
1811
1812 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1813 {
1814 char firstchar;
1815 int cnt;
1816
1817 if (len < marker_size + 1)
1818 return 0;
1819 firstchar = line[0];
1820 switch (firstchar) {
1821 case '=': case '>': case '<': case '|':
1822 break;
1823 default:
1824 return 0;
1825 }
1826 for (cnt = 1; cnt < marker_size; cnt++)
1827 if (line[cnt] != firstchar)
1828 return 0;
1829 /* line[1] thru line[marker_size-1] are same as firstchar */
1830 if (len < marker_size + 1 || !isspace(line[marker_size]))
1831 return 0;
1832 return 1;
1833 }
1834
1835 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1836 {
1837 struct checkdiff_t *data = priv;
1838 int marker_size = data->conflict_marker_size;
1839 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1840 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1841 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1842 char *err;
1843 char *line_prefix = "";
1844 struct strbuf *msgbuf;
1845
1846 assert(data->o);
1847 if (data->o->output_prefix) {
1848 msgbuf = data->o->output_prefix(data->o,
1849 data->o->output_prefix_data);
1850 line_prefix = msgbuf->buf;
1851 }
1852
1853 if (line[0] == '+') {
1854 unsigned bad;
1855 data->lineno++;
1856 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1857 data->status |= 1;
1858 fprintf(data->o->file,
1859 "%s%s:%d: leftover conflict marker\n",
1860 line_prefix, data->filename, data->lineno);
1861 }
1862 bad = ws_check(line + 1, len - 1, data->ws_rule);
1863 if (!bad)
1864 return;
1865 data->status |= bad;
1866 err = whitespace_error_string(bad);
1867 fprintf(data->o->file, "%s%s:%d: %s.\n",
1868 line_prefix, data->filename, data->lineno, err);
1869 free(err);
1870 emit_line(data->o, set, reset, line, 1);
1871 ws_check_emit(line + 1, len - 1, data->ws_rule,
1872 data->o->file, set, reset, ws);
1873 } else if (line[0] == ' ') {
1874 data->lineno++;
1875 } else if (line[0] == '@') {
1876 char *plus = strchr(line, '+');
1877 if (plus)
1878 data->lineno = strtol(plus, NULL, 10) - 1;
1879 else
1880 die("invalid diff");
1881 }
1882 }
1883
1884 static unsigned char *deflate_it(char *data,
1885 unsigned long size,
1886 unsigned long *result_size)
1887 {
1888 int bound;
1889 unsigned char *deflated;
1890 git_zstream stream;
1891
1892 memset(&stream, 0, sizeof(stream));
1893 git_deflate_init(&stream, zlib_compression_level);
1894 bound = git_deflate_bound(&stream, size);
1895 deflated = xmalloc(bound);
1896 stream.next_out = deflated;
1897 stream.avail_out = bound;
1898
1899 stream.next_in = (unsigned char *)data;
1900 stream.avail_in = size;
1901 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1902 ; /* nothing */
1903 git_deflate_end(&stream);
1904 *result_size = stream.total_out;
1905 return deflated;
1906 }
1907
1908 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1909 {
1910 void *cp;
1911 void *delta;
1912 void *deflated;
1913 void *data;
1914 unsigned long orig_size;
1915 unsigned long delta_size;
1916 unsigned long deflate_size;
1917 unsigned long data_size;
1918
1919 /* We could do deflated delta, or we could do just deflated two,
1920 * whichever is smaller.
1921 */
1922 delta = NULL;
1923 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1924 if (one->size && two->size) {
1925 delta = diff_delta(one->ptr, one->size,
1926 two->ptr, two->size,
1927 &delta_size, deflate_size);
1928 if (delta) {
1929 void *to_free = delta;
1930 orig_size = delta_size;
1931 delta = deflate_it(delta, delta_size, &delta_size);
1932 free(to_free);
1933 }
1934 }
1935
1936 if (delta && delta_size < deflate_size) {
1937 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1938 free(deflated);
1939 data = delta;
1940 data_size = delta_size;
1941 }
1942 else {
1943 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1944 free(delta);
1945 data = deflated;
1946 data_size = deflate_size;
1947 }
1948
1949 /* emit data encoded in base85 */
1950 cp = data;
1951 while (data_size) {
1952 int bytes = (52 < data_size) ? 52 : data_size;
1953 char line[70];
1954 data_size -= bytes;
1955 if (bytes <= 26)
1956 line[0] = bytes + 'A' - 1;
1957 else
1958 line[0] = bytes - 26 + 'a' - 1;
1959 encode_85(line + 1, cp, bytes);
1960 cp = (char *) cp + bytes;
1961 fprintf(file, "%s", prefix);
1962 fputs(line, file);
1963 fputc('\n', file);
1964 }
1965 fprintf(file, "%s\n", prefix);
1966 free(data);
1967 }
1968
1969 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1970 {
1971 fprintf(file, "%sGIT binary patch\n", prefix);
1972 emit_binary_diff_body(file, one, two, prefix);
1973 emit_binary_diff_body(file, two, one, prefix);
1974 }
1975
1976 static void diff_filespec_load_driver(struct diff_filespec *one)
1977 {
1978 /* Use already-loaded driver */
1979 if (one->driver)
1980 return;
1981
1982 if (S_ISREG(one->mode))
1983 one->driver = userdiff_find_by_path(one->path);
1984
1985 /* Fallback to default settings */
1986 if (!one->driver)
1987 one->driver = userdiff_find_by_name("default");
1988 }
1989
1990 int diff_filespec_is_binary(struct diff_filespec *one)
1991 {
1992 if (one->is_binary == -1) {
1993 diff_filespec_load_driver(one);
1994 if (one->driver->binary != -1)
1995 one->is_binary = one->driver->binary;
1996 else {
1997 if (!one->data && DIFF_FILE_VALID(one))
1998 diff_populate_filespec(one, 0);
1999 if (one->data)
2000 one->is_binary = buffer_is_binary(one->data,
2001 one->size);
2002 if (one->is_binary == -1)
2003 one->is_binary = 0;
2004 }
2005 }
2006 return one->is_binary;
2007 }
2008
2009 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2010 {
2011 diff_filespec_load_driver(one);
2012 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2013 }
2014
2015 static const char *userdiff_word_regex(struct diff_filespec *one)
2016 {
2017 diff_filespec_load_driver(one);
2018 return one->driver->word_regex;
2019 }
2020
2021 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2022 {
2023 if (!options->a_prefix)
2024 options->a_prefix = a;
2025 if (!options->b_prefix)
2026 options->b_prefix = b;
2027 }
2028
2029 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2030 {
2031 if (!DIFF_FILE_VALID(one))
2032 return NULL;
2033
2034 diff_filespec_load_driver(one);
2035 return userdiff_get_textconv(one->driver);
2036 }
2037
2038 static void builtin_diff(const char *name_a,
2039 const char *name_b,
2040 struct diff_filespec *one,
2041 struct diff_filespec *two,
2042 const char *xfrm_msg,
2043 int must_show_header,
2044 struct diff_options *o,
2045 int complete_rewrite)
2046 {
2047 mmfile_t mf1, mf2;
2048 const char *lbl[2];
2049 char *a_one, *b_two;
2050 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2051 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2052 const char *a_prefix, *b_prefix;
2053 struct userdiff_driver *textconv_one = NULL;
2054 struct userdiff_driver *textconv_two = NULL;
2055 struct strbuf header = STRBUF_INIT;
2056 struct strbuf *msgbuf;
2057 char *line_prefix = "";
2058
2059 if (o->output_prefix) {
2060 msgbuf = o->output_prefix(o, o->output_prefix_data);
2061 line_prefix = msgbuf->buf;
2062 }
2063
2064 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2065 (!one->mode || S_ISGITLINK(one->mode)) &&
2066 (!two->mode || S_ISGITLINK(two->mode))) {
2067 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2068 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2069 show_submodule_summary(o->file, one ? one->path : two->path,
2070 one->sha1, two->sha1, two->dirty_submodule,
2071 del, add, reset);
2072 return;
2073 }
2074
2075 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2076 textconv_one = get_textconv(one);
2077 textconv_two = get_textconv(two);
2078 }
2079
2080 diff_set_mnemonic_prefix(o, "a/", "b/");
2081 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2082 a_prefix = o->b_prefix;
2083 b_prefix = o->a_prefix;
2084 } else {
2085 a_prefix = o->a_prefix;
2086 b_prefix = o->b_prefix;
2087 }
2088
2089 /* Never use a non-valid filename anywhere if at all possible */
2090 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2091 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2092
2093 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2094 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2095 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2096 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2097 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2098 if (lbl[0][0] == '/') {
2099 /* /dev/null */
2100 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2101 if (xfrm_msg)
2102 strbuf_addstr(&header, xfrm_msg);
2103 must_show_header = 1;
2104 }
2105 else if (lbl[1][0] == '/') {
2106 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2107 if (xfrm_msg)
2108 strbuf_addstr(&header, xfrm_msg);
2109 must_show_header = 1;
2110 }
2111 else {
2112 if (one->mode != two->mode) {
2113 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2114 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2115 must_show_header = 1;
2116 }
2117 if (xfrm_msg)
2118 strbuf_addstr(&header, xfrm_msg);
2119
2120 /*
2121 * we do not run diff between different kind
2122 * of objects.
2123 */
2124 if ((one->mode ^ two->mode) & S_IFMT)
2125 goto free_ab_and_return;
2126 if (complete_rewrite &&
2127 (textconv_one || !diff_filespec_is_binary(one)) &&
2128 (textconv_two || !diff_filespec_is_binary(two))) {
2129 fprintf(o->file, "%s", header.buf);
2130 strbuf_reset(&header);
2131 emit_rewrite_diff(name_a, name_b, one, two,
2132 textconv_one, textconv_two, o);
2133 o->found_changes = 1;
2134 goto free_ab_and_return;
2135 }
2136 }
2137
2138 if (o->irreversible_delete && lbl[1][0] == '/') {
2139 fprintf(o->file, "%s", header.buf);
2140 strbuf_reset(&header);
2141 goto free_ab_and_return;
2142 } else if (!DIFF_OPT_TST(o, TEXT) &&
2143 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2144 (!textconv_two && diff_filespec_is_binary(two)) )) {
2145 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2146 die("unable to read files to diff");
2147 /* Quite common confusing case */
2148 if (mf1.size == mf2.size &&
2149 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2150 if (must_show_header)
2151 fprintf(o->file, "%s", header.buf);
2152 goto free_ab_and_return;
2153 }
2154 fprintf(o->file, "%s", header.buf);
2155 strbuf_reset(&header);
2156 if (DIFF_OPT_TST(o, BINARY))
2157 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2158 else
2159 fprintf(o->file, "%sBinary files %s and %s differ\n",
2160 line_prefix, lbl[0], lbl[1]);
2161 o->found_changes = 1;
2162 } else {
2163 /* Crazy xdl interfaces.. */
2164 const char *diffopts = getenv("GIT_DIFF_OPTS");
2165 xpparam_t xpp;
2166 xdemitconf_t xecfg;
2167 struct emit_callback ecbdata;
2168 const struct userdiff_funcname *pe;
2169
2170 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2171 fprintf(o->file, "%s", header.buf);
2172 strbuf_reset(&header);
2173 }
2174
2175 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2176 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2177
2178 pe = diff_funcname_pattern(one);
2179 if (!pe)
2180 pe = diff_funcname_pattern(two);
2181
2182 memset(&xpp, 0, sizeof(xpp));
2183 memset(&xecfg, 0, sizeof(xecfg));
2184 memset(&ecbdata, 0, sizeof(ecbdata));
2185 ecbdata.label_path = lbl;
2186 ecbdata.color_diff = want_color(o->use_color);
2187 ecbdata.found_changesp = &o->found_changes;
2188 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2189 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2190 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2191 ecbdata.opt = o;
2192 ecbdata.header = header.len ? &header : NULL;
2193 xpp.flags = o->xdl_opts;
2194 xecfg.ctxlen = o->context;
2195 xecfg.interhunkctxlen = o->interhunkcontext;
2196 xecfg.flags = XDL_EMIT_FUNCNAMES;
2197 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2198 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2199 if (pe)
2200 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2201 if (!diffopts)
2202 ;
2203 else if (!prefixcmp(diffopts, "--unified="))
2204 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2205 else if (!prefixcmp(diffopts, "-u"))
2206 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2207 if (o->word_diff) {
2208 int i;
2209
2210 ecbdata.diff_words =
2211 xcalloc(1, sizeof(struct diff_words_data));
2212 ecbdata.diff_words->type = o->word_diff;
2213 ecbdata.diff_words->opt = o;
2214 if (!o->word_regex)
2215 o->word_regex = userdiff_word_regex(one);
2216 if (!o->word_regex)
2217 o->word_regex = userdiff_word_regex(two);
2218 if (!o->word_regex)
2219 o->word_regex = diff_word_regex_cfg;
2220 if (o->word_regex) {
2221 ecbdata.diff_words->word_regex = (regex_t *)
2222 xmalloc(sizeof(regex_t));
2223 if (regcomp(ecbdata.diff_words->word_regex,
2224 o->word_regex,
2225 REG_EXTENDED | REG_NEWLINE))
2226 die ("Invalid regular expression: %s",
2227 o->word_regex);
2228 }
2229 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2230 if (o->word_diff == diff_words_styles[i].type) {
2231 ecbdata.diff_words->style =
2232 &diff_words_styles[i];
2233 break;
2234 }
2235 }
2236 if (want_color(o->use_color)) {
2237 struct diff_words_style *st = ecbdata.diff_words->style;
2238 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2239 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2240 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2241 }
2242 }
2243 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2244 &xpp, &xecfg);
2245 if (o->word_diff)
2246 free_diff_words_data(&ecbdata);
2247 if (textconv_one)
2248 free(mf1.ptr);
2249 if (textconv_two)
2250 free(mf2.ptr);
2251 xdiff_clear_find_func(&xecfg);
2252 }
2253
2254 free_ab_and_return:
2255 strbuf_release(&header);
2256 diff_free_filespec_data(one);
2257 diff_free_filespec_data(two);
2258 free(a_one);
2259 free(b_two);
2260 return;
2261 }
2262
2263 static void builtin_diffstat(const char *name_a, const char *name_b,
2264 struct diff_filespec *one,
2265 struct diff_filespec *two,
2266 struct diffstat_t *diffstat,
2267 struct diff_options *o,
2268 int complete_rewrite)
2269 {
2270 mmfile_t mf1, mf2;
2271 struct diffstat_file *data;
2272
2273 data = diffstat_add(diffstat, name_a, name_b);
2274
2275 if (!one || !two) {
2276 data->is_unmerged = 1;
2277 return;
2278 }
2279
2280 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2281 data->is_binary = 1;
2282 data->added = diff_filespec_size(two);
2283 data->deleted = diff_filespec_size(one);
2284 }
2285
2286 else if (complete_rewrite) {
2287 diff_populate_filespec(one, 0);
2288 diff_populate_filespec(two, 0);
2289 data->deleted = count_lines(one->data, one->size);
2290 data->added = count_lines(two->data, two->size);
2291 }
2292
2293 else {
2294 /* Crazy xdl interfaces.. */
2295 xpparam_t xpp;
2296 xdemitconf_t xecfg;
2297
2298 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2299 die("unable to read files to diff");
2300
2301 memset(&xpp, 0, sizeof(xpp));
2302 memset(&xecfg, 0, sizeof(xecfg));
2303 xpp.flags = o->xdl_opts;
2304 xecfg.ctxlen = o->context;
2305 xecfg.interhunkctxlen = o->interhunkcontext;
2306 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2307 &xpp, &xecfg);
2308 }
2309
2310 diff_free_filespec_data(one);
2311 diff_free_filespec_data(two);
2312 }
2313
2314 static void builtin_checkdiff(const char *name_a, const char *name_b,
2315 const char *attr_path,
2316 struct diff_filespec *one,
2317 struct diff_filespec *two,
2318 struct diff_options *o)
2319 {
2320 mmfile_t mf1, mf2;
2321 struct checkdiff_t data;
2322
2323 if (!two)
2324 return;
2325
2326 memset(&data, 0, sizeof(data));
2327 data.filename = name_b ? name_b : name_a;
2328 data.lineno = 0;
2329 data.o = o;
2330 data.ws_rule = whitespace_rule(attr_path);
2331 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2332
2333 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2334 die("unable to read files to diff");
2335
2336 /*
2337 * All the other codepaths check both sides, but not checking
2338 * the "old" side here is deliberate. We are checking the newly
2339 * introduced changes, and as long as the "new" side is text, we
2340 * can and should check what it introduces.
2341 */
2342 if (diff_filespec_is_binary(two))
2343 goto free_and_return;
2344 else {
2345 /* Crazy xdl interfaces.. */
2346 xpparam_t xpp;
2347 xdemitconf_t xecfg;
2348
2349 memset(&xpp, 0, sizeof(xpp));
2350 memset(&xecfg, 0, sizeof(xecfg));
2351 xecfg.ctxlen = 1; /* at least one context line */
2352 xpp.flags = 0;
2353 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2354 &xpp, &xecfg);
2355
2356 if (data.ws_rule & WS_BLANK_AT_EOF) {
2357 struct emit_callback ecbdata;
2358 int blank_at_eof;
2359
2360 ecbdata.ws_rule = data.ws_rule;
2361 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2362 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2363
2364 if (blank_at_eof) {
2365 static char *err;
2366 if (!err)
2367 err = whitespace_error_string(WS_BLANK_AT_EOF);
2368 fprintf(o->file, "%s:%d: %s.\n",
2369 data.filename, blank_at_eof, err);
2370 data.status = 1; /* report errors */
2371 }
2372 }
2373 }
2374 free_and_return:
2375 diff_free_filespec_data(one);
2376 diff_free_filespec_data(two);
2377 if (data.status)
2378 DIFF_OPT_SET(o, CHECK_FAILED);
2379 }
2380
2381 struct diff_filespec *alloc_filespec(const char *path)
2382 {
2383 int namelen = strlen(path);
2384 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2385
2386 memset(spec, 0, sizeof(*spec));
2387 spec->path = (char *)(spec + 1);
2388 memcpy(spec->path, path, namelen+1);
2389 spec->count = 1;
2390 spec->is_binary = -1;
2391 return spec;
2392 }
2393
2394 void free_filespec(struct diff_filespec *spec)
2395 {
2396 if (!--spec->count) {
2397 diff_free_filespec_data(spec);
2398 free(spec);
2399 }
2400 }
2401
2402 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2403 unsigned short mode)
2404 {
2405 if (mode) {
2406 spec->mode = canon_mode(mode);
2407 hashcpy(spec->sha1, sha1);
2408 spec->sha1_valid = !is_null_sha1(sha1);
2409 }
2410 }
2411
2412 /*
2413 * Given a name and sha1 pair, if the index tells us the file in
2414 * the work tree has that object contents, return true, so that
2415 * prepare_temp_file() does not have to inflate and extract.
2416 */
2417 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2418 {
2419 struct cache_entry *ce;
2420 struct stat st;
2421 int pos, len;
2422
2423 /*
2424 * We do not read the cache ourselves here, because the
2425 * benchmark with my previous version that always reads cache
2426 * shows that it makes things worse for diff-tree comparing
2427 * two linux-2.6 kernel trees in an already checked out work
2428 * tree. This is because most diff-tree comparisons deal with
2429 * only a small number of files, while reading the cache is
2430 * expensive for a large project, and its cost outweighs the
2431 * savings we get by not inflating the object to a temporary
2432 * file. Practically, this code only helps when we are used
2433 * by diff-cache --cached, which does read the cache before
2434 * calling us.
2435 */
2436 if (!active_cache)
2437 return 0;
2438
2439 /* We want to avoid the working directory if our caller
2440 * doesn't need the data in a normal file, this system
2441 * is rather slow with its stat/open/mmap/close syscalls,
2442 * and the object is contained in a pack file. The pack
2443 * is probably already open and will be faster to obtain
2444 * the data through than the working directory. Loose
2445 * objects however would tend to be slower as they need
2446 * to be individually opened and inflated.
2447 */
2448 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2449 return 0;
2450
2451 len = strlen(name);
2452 pos = cache_name_pos(name, len);
2453 if (pos < 0)
2454 return 0;
2455 ce = active_cache[pos];
2456
2457 /*
2458 * This is not the sha1 we are looking for, or
2459 * unreusable because it is not a regular file.
2460 */
2461 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2462 return 0;
2463
2464 /*
2465 * If ce is marked as "assume unchanged", there is no
2466 * guarantee that work tree matches what we are looking for.
2467 */
2468 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2469 return 0;
2470
2471 /*
2472 * If ce matches the file in the work tree, we can reuse it.
2473 */
2474 if (ce_uptodate(ce) ||
2475 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2476 return 1;
2477
2478 return 0;
2479 }
2480
2481 static int populate_from_stdin(struct diff_filespec *s)
2482 {
2483 struct strbuf buf = STRBUF_INIT;
2484 size_t size = 0;
2485
2486 if (strbuf_read(&buf, 0, 0) < 0)
2487 return error("error while reading from stdin %s",
2488 strerror(errno));
2489
2490 s->should_munmap = 0;
2491 s->data = strbuf_detach(&buf, &size);
2492 s->size = size;
2493 s->should_free = 1;
2494 return 0;
2495 }
2496
2497 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2498 {
2499 int len;
2500 char *data = xmalloc(100), *dirty = "";
2501
2502 /* Are we looking at the work tree? */
2503 if (s->dirty_submodule)
2504 dirty = "-dirty";
2505
2506 len = snprintf(data, 100,
2507 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2508 s->data = data;
2509 s->size = len;
2510 s->should_free = 1;
2511 if (size_only) {
2512 s->data = NULL;
2513 free(data);
2514 }
2515 return 0;
2516 }
2517
2518 /*
2519 * While doing rename detection and pickaxe operation, we may need to
2520 * grab the data for the blob (or file) for our own in-core comparison.
2521 * diff_filespec has data and size fields for this purpose.
2522 */
2523 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2524 {
2525 int err = 0;
2526 if (!DIFF_FILE_VALID(s))
2527 die("internal error: asking to populate invalid file.");
2528 if (S_ISDIR(s->mode))
2529 return -1;
2530
2531 if (s->data)
2532 return 0;
2533
2534 if (size_only && 0 < s->size)
2535 return 0;
2536
2537 if (S_ISGITLINK(s->mode))
2538 return diff_populate_gitlink(s, size_only);
2539
2540 if (!s->sha1_valid ||
2541 reuse_worktree_file(s->path, s->sha1, 0)) {
2542 struct strbuf buf = STRBUF_INIT;
2543 struct stat st;
2544 int fd;
2545
2546 if (!strcmp(s->path, "-"))
2547 return populate_from_stdin(s);
2548
2549 if (lstat(s->path, &st) < 0) {
2550 if (errno == ENOENT) {
2551 err_empty:
2552 err = -1;
2553 empty:
2554 s->data = (char *)"";
2555 s->size = 0;
2556 return err;
2557 }
2558 }
2559 s->size = xsize_t(st.st_size);
2560 if (!s->size)
2561 goto empty;
2562 if (S_ISLNK(st.st_mode)) {
2563 struct strbuf sb = STRBUF_INIT;
2564
2565 if (strbuf_readlink(&sb, s->path, s->size))
2566 goto err_empty;
2567 s->size = sb.len;
2568 s->data = strbuf_detach(&sb, NULL);
2569 s->should_free = 1;
2570 return 0;
2571 }
2572 if (size_only)
2573 return 0;
2574 fd = open(s->path, O_RDONLY);
2575 if (fd < 0)
2576 goto err_empty;
2577 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2578 close(fd);
2579 s->should_munmap = 1;
2580
2581 /*
2582 * Convert from working tree format to canonical git format
2583 */
2584 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2585 size_t size = 0;
2586 munmap(s->data, s->size);
2587 s->should_munmap = 0;
2588 s->data = strbuf_detach(&buf, &size);
2589 s->size = size;
2590 s->should_free = 1;
2591 }
2592 }
2593 else {
2594 enum object_type type;
2595 if (size_only) {
2596 type = sha1_object_info(s->sha1, &s->size);
2597 if (type < 0)
2598 die("unable to read %s", sha1_to_hex(s->sha1));
2599 } else {
2600 s->data = read_sha1_file(s->sha1, &type, &s->size);
2601 if (!s->data)
2602 die("unable to read %s", sha1_to_hex(s->sha1));
2603 s->should_free = 1;
2604 }
2605 }
2606 return 0;
2607 }
2608
2609 void diff_free_filespec_blob(struct diff_filespec *s)
2610 {
2611 if (s->should_free)
2612 free(s->data);
2613 else if (s->should_munmap)
2614 munmap(s->data, s->size);
2615
2616 if (s->should_free || s->should_munmap) {
2617 s->should_free = s->should_munmap = 0;
2618 s->data = NULL;
2619 }
2620 }
2621
2622 void diff_free_filespec_data(struct diff_filespec *s)
2623 {
2624 diff_free_filespec_blob(s);
2625 free(s->cnt_data);
2626 s->cnt_data = NULL;
2627 }
2628
2629 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2630 void *blob,
2631 unsigned long size,
2632 const unsigned char *sha1,
2633 int mode)
2634 {
2635 int fd;
2636 struct strbuf buf = STRBUF_INIT;
2637 struct strbuf template = STRBUF_INIT;
2638 char *path_dup = xstrdup(path);
2639 const char *base = basename(path_dup);
2640
2641 /* Generate "XXXXXX_basename.ext" */
2642 strbuf_addstr(&template, "XXXXXX_");
2643 strbuf_addstr(&template, base);
2644
2645 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2646 strlen(base) + 1);
2647 if (fd < 0)
2648 die_errno("unable to create temp-file");
2649 if (convert_to_working_tree(path,
2650 (const char *)blob, (size_t)size, &buf)) {
2651 blob = buf.buf;
2652 size = buf.len;
2653 }
2654 if (write_in_full(fd, blob, size) != size)
2655 die_errno("unable to write temp-file");
2656 close(fd);
2657 temp->name = temp->tmp_path;
2658 strcpy(temp->hex, sha1_to_hex(sha1));
2659 temp->hex[40] = 0;
2660 sprintf(temp->mode, "%06o", mode);
2661 strbuf_release(&buf);
2662 strbuf_release(&template);
2663 free(path_dup);
2664 }
2665
2666 static struct diff_tempfile *prepare_temp_file(const char *name,
2667 struct diff_filespec *one)
2668 {
2669 struct diff_tempfile *temp = claim_diff_tempfile();
2670
2671 if (!DIFF_FILE_VALID(one)) {
2672 not_a_valid_file:
2673 /* A '-' entry produces this for file-2, and
2674 * a '+' entry produces this for file-1.
2675 */
2676 temp->name = "/dev/null";
2677 strcpy(temp->hex, ".");
2678 strcpy(temp->mode, ".");
2679 return temp;
2680 }
2681
2682 if (!remove_tempfile_installed) {
2683 atexit(remove_tempfile);
2684 sigchain_push_common(remove_tempfile_on_signal);
2685 remove_tempfile_installed = 1;
2686 }
2687
2688 if (!one->sha1_valid ||
2689 reuse_worktree_file(name, one->sha1, 1)) {
2690 struct stat st;
2691 if (lstat(name, &st) < 0) {
2692 if (errno == ENOENT)
2693 goto not_a_valid_file;
2694 die_errno("stat(%s)", name);
2695 }
2696 if (S_ISLNK(st.st_mode)) {
2697 struct strbuf sb = STRBUF_INIT;
2698 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2699 die_errno("readlink(%s)", name);
2700 prep_temp_blob(name, temp, sb.buf, sb.len,
2701 (one->sha1_valid ?
2702 one->sha1 : null_sha1),
2703 (one->sha1_valid ?
2704 one->mode : S_IFLNK));
2705 strbuf_release(&sb);
2706 }
2707 else {
2708 /* we can borrow from the file in the work tree */
2709 temp->name = name;
2710 if (!one->sha1_valid)
2711 strcpy(temp->hex, sha1_to_hex(null_sha1));
2712 else
2713 strcpy(temp->hex, sha1_to_hex(one->sha1));
2714 /* Even though we may sometimes borrow the
2715 * contents from the work tree, we always want
2716 * one->mode. mode is trustworthy even when
2717 * !(one->sha1_valid), as long as
2718 * DIFF_FILE_VALID(one).
2719 */
2720 sprintf(temp->mode, "%06o", one->mode);
2721 }
2722 return temp;
2723 }
2724 else {
2725 if (diff_populate_filespec(one, 0))
2726 die("cannot read data blob for %s", one->path);
2727 prep_temp_blob(name, temp, one->data, one->size,
2728 one->sha1, one->mode);
2729 }
2730 return temp;
2731 }
2732
2733 /* An external diff command takes:
2734 *
2735 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2736 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2737 *
2738 */
2739 static void run_external_diff(const char *pgm,
2740 const char *name,
2741 const char *other,
2742 struct diff_filespec *one,
2743 struct diff_filespec *two,
2744 const char *xfrm_msg,
2745 int complete_rewrite)
2746 {
2747 const char *spawn_arg[10];
2748 int retval;
2749 const char **arg = &spawn_arg[0];
2750
2751 if (one && two) {
2752 struct diff_tempfile *temp_one, *temp_two;
2753 const char *othername = (other ? other : name);
2754 temp_one = prepare_temp_file(name, one);
2755 temp_two = prepare_temp_file(othername, two);
2756 *arg++ = pgm;
2757 *arg++ = name;
2758 *arg++ = temp_one->name;
2759 *arg++ = temp_one->hex;
2760 *arg++ = temp_one->mode;
2761 *arg++ = temp_two->name;
2762 *arg++ = temp_two->hex;
2763 *arg++ = temp_two->mode;
2764 if (other) {
2765 *arg++ = other;
2766 *arg++ = xfrm_msg;
2767 }
2768 } else {
2769 *arg++ = pgm;
2770 *arg++ = name;
2771 }
2772 *arg = NULL;
2773 fflush(NULL);
2774 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2775 remove_tempfile();
2776 if (retval) {
2777 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2778 exit(1);
2779 }
2780 }
2781
2782 static int similarity_index(struct diff_filepair *p)
2783 {
2784 return p->score * 100 / MAX_SCORE;
2785 }
2786
2787 static void fill_metainfo(struct strbuf *msg,
2788 const char *name,
2789 const char *other,
2790 struct diff_filespec *one,
2791 struct diff_filespec *two,
2792 struct diff_options *o,
2793 struct diff_filepair *p,
2794 int *must_show_header,
2795 int use_color)
2796 {
2797 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2798 const char *reset = diff_get_color(use_color, DIFF_RESET);
2799 struct strbuf *msgbuf;
2800 char *line_prefix = "";
2801
2802 *must_show_header = 1;
2803 if (o->output_prefix) {
2804 msgbuf = o->output_prefix(o, o->output_prefix_data);
2805 line_prefix = msgbuf->buf;
2806 }
2807 strbuf_init(msg, PATH_MAX * 2 + 300);
2808 switch (p->status) {
2809 case DIFF_STATUS_COPIED:
2810 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2811 line_prefix, set, similarity_index(p));
2812 strbuf_addf(msg, "%s\n%s%scopy from ",
2813 reset, line_prefix, set);
2814 quote_c_style(name, msg, NULL, 0);
2815 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2816 quote_c_style(other, msg, NULL, 0);
2817 strbuf_addf(msg, "%s\n", reset);
2818 break;
2819 case DIFF_STATUS_RENAMED:
2820 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2821 line_prefix, set, similarity_index(p));
2822 strbuf_addf(msg, "%s\n%s%srename from ",
2823 reset, line_prefix, set);
2824 quote_c_style(name, msg, NULL, 0);
2825 strbuf_addf(msg, "%s\n%s%srename to ",
2826 reset, line_prefix, set);
2827 quote_c_style(other, msg, NULL, 0);
2828 strbuf_addf(msg, "%s\n", reset);
2829 break;
2830 case DIFF_STATUS_MODIFIED:
2831 if (p->score) {
2832 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2833 line_prefix,
2834 set, similarity_index(p), reset);
2835 break;
2836 }
2837 /* fallthru */
2838 default:
2839 *must_show_header = 0;
2840 }
2841 if (one && two && hashcmp(one->sha1, two->sha1)) {
2842 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2843
2844 if (DIFF_OPT_TST(o, BINARY)) {
2845 mmfile_t mf;
2846 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2847 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2848 abbrev = 40;
2849 }
2850 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2851 find_unique_abbrev(one->sha1, abbrev));
2852 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2853 if (one->mode == two->mode)
2854 strbuf_addf(msg, " %06o", one->mode);
2855 strbuf_addf(msg, "%s\n", reset);
2856 }
2857 }
2858
2859 static void run_diff_cmd(const char *pgm,
2860 const char *name,
2861 const char *other,
2862 const char *attr_path,
2863 struct diff_filespec *one,
2864 struct diff_filespec *two,
2865 struct strbuf *msg,
2866 struct diff_options *o,
2867 struct diff_filepair *p)
2868 {
2869 const char *xfrm_msg = NULL;
2870 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2871 int must_show_header = 0;
2872
2873 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2874 pgm = NULL;
2875 else {
2876 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2877 if (drv && drv->external)
2878 pgm = drv->external;
2879 }
2880
2881 if (msg) {
2882 /*
2883 * don't use colors when the header is intended for an
2884 * external diff driver
2885 */
2886 fill_metainfo(msg, name, other, one, two, o, p,
2887 &must_show_header,
2888 want_color(o->use_color) && !pgm);
2889 xfrm_msg = msg->len ? msg->buf : NULL;
2890 }
2891
2892 if (pgm) {
2893 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2894 complete_rewrite);
2895 return;
2896 }
2897 if (one && two)
2898 builtin_diff(name, other ? other : name,
2899 one, two, xfrm_msg, must_show_header,
2900 o, complete_rewrite);
2901 else
2902 fprintf(o->file, "* Unmerged path %s\n", name);
2903 }
2904
2905 static void diff_fill_sha1_info(struct diff_filespec *one)
2906 {
2907 if (DIFF_FILE_VALID(one)) {
2908 if (!one->sha1_valid) {
2909 struct stat st;
2910 if (!strcmp(one->path, "-")) {
2911 hashcpy(one->sha1, null_sha1);
2912 return;
2913 }
2914 if (lstat(one->path, &st) < 0)
2915 die_errno("stat '%s'", one->path);
2916 if (index_path(one->sha1, one->path, &st, 0))
2917 die("cannot hash %s", one->path);
2918 }
2919 }
2920 else
2921 hashclr(one->sha1);
2922 }
2923
2924 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2925 {
2926 /* Strip the prefix but do not molest /dev/null and absolute paths */
2927 if (*namep && **namep != '/') {
2928 *namep += prefix_length;
2929 if (**namep == '/')
2930 ++*namep;
2931 }
2932 if (*otherp && **otherp != '/') {
2933 *otherp += prefix_length;
2934 if (**otherp == '/')
2935 ++*otherp;
2936 }
2937 }
2938
2939 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2940 {
2941 const char *pgm = external_diff();
2942 struct strbuf msg;
2943 struct diff_filespec *one = p->one;
2944 struct diff_filespec *two = p->two;
2945 const char *name;
2946 const char *other;
2947 const char *attr_path;
2948
2949 name = p->one->path;
2950 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2951 attr_path = name;
2952 if (o->prefix_length)
2953 strip_prefix(o->prefix_length, &name, &other);
2954
2955 if (DIFF_PAIR_UNMERGED(p)) {
2956 run_diff_cmd(pgm, name, NULL, attr_path,
2957 NULL, NULL, NULL, o, p);
2958 return;
2959 }
2960
2961 diff_fill_sha1_info(one);
2962 diff_fill_sha1_info(two);
2963
2964 if (!pgm &&
2965 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2966 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2967 /*
2968 * a filepair that changes between file and symlink
2969 * needs to be split into deletion and creation.
2970 */
2971 struct diff_filespec *null = alloc_filespec(two->path);
2972 run_diff_cmd(NULL, name, other, attr_path,
2973 one, null, &msg, o, p);
2974 free(null);
2975 strbuf_release(&msg);
2976
2977 null = alloc_filespec(one->path);
2978 run_diff_cmd(NULL, name, other, attr_path,
2979 null, two, &msg, o, p);
2980 free(null);
2981 }
2982 else
2983 run_diff_cmd(pgm, name, other, attr_path,
2984 one, two, &msg, o, p);
2985
2986 strbuf_release(&msg);
2987 }
2988
2989 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2990 struct diffstat_t *diffstat)
2991 {
2992 const char *name;
2993 const char *other;
2994 int complete_rewrite = 0;
2995
2996 if (DIFF_PAIR_UNMERGED(p)) {
2997 /* unmerged */
2998 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2999 return;
3000 }
3001
3002 name = p->one->path;
3003 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3004
3005 if (o->prefix_length)
3006 strip_prefix(o->prefix_length, &name, &other);
3007
3008 diff_fill_sha1_info(p->one);
3009 diff_fill_sha1_info(p->two);
3010
3011 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3012 complete_rewrite = 1;
3013 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3014 }
3015
3016 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3017 {
3018 const char *name;
3019 const char *other;
3020 const char *attr_path;
3021
3022 if (DIFF_PAIR_UNMERGED(p)) {
3023 /* unmerged */
3024 return;
3025 }
3026
3027 name = p->one->path;
3028 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3029 attr_path = other ? other : name;
3030
3031 if (o->prefix_length)
3032 strip_prefix(o->prefix_length, &name, &other);
3033
3034 diff_fill_sha1_info(p->one);
3035 diff_fill_sha1_info(p->two);
3036
3037 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3038 }
3039
3040 void diff_setup(struct diff_options *options)
3041 {
3042 memcpy(options, &default_diff_options, sizeof(*options));
3043
3044 options->file = stdout;
3045
3046 options->line_termination = '\n';
3047 options->break_opt = -1;
3048 options->rename_limit = -1;
3049 options->dirstat_permille = diff_dirstat_permille_default;
3050 options->context = 3;
3051
3052 options->change = diff_change;
3053 options->add_remove = diff_addremove;
3054 options->use_color = diff_use_color_default;
3055 options->detect_rename = diff_detect_rename_default;
3056
3057 if (diff_no_prefix) {
3058 options->a_prefix = options->b_prefix = "";
3059 } else if (!diff_mnemonic_prefix) {
3060 options->a_prefix = "a/";
3061 options->b_prefix = "b/";
3062 }
3063 }
3064
3065 int diff_setup_done(struct diff_options *options)
3066 {
3067 int count = 0;
3068
3069 if (options->output_format & DIFF_FORMAT_NAME)
3070 count++;
3071 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3072 count++;
3073 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3074 count++;
3075 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3076 count++;
3077 if (count > 1)
3078 die("--name-only, --name-status, --check and -s are mutually exclusive");
3079
3080 /*
3081 * Most of the time we can say "there are changes"
3082 * only by checking if there are changed paths, but
3083 * --ignore-whitespace* options force us to look
3084 * inside contents.
3085 */
3086
3087 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3088 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3089 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3090 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3091 else
3092 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3093
3094 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3095 options->detect_rename = DIFF_DETECT_COPY;
3096
3097 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3098 options->prefix = NULL;
3099 if (options->prefix)
3100 options->prefix_length = strlen(options->prefix);
3101 else
3102 options->prefix_length = 0;
3103
3104 if (options->output_format & (DIFF_FORMAT_NAME |
3105 DIFF_FORMAT_NAME_STATUS |
3106 DIFF_FORMAT_CHECKDIFF |
3107 DIFF_FORMAT_NO_OUTPUT))
3108 options->output_format &= ~(DIFF_FORMAT_RAW |
3109 DIFF_FORMAT_NUMSTAT |
3110 DIFF_FORMAT_DIFFSTAT |
3111 DIFF_FORMAT_SHORTSTAT |
3112 DIFF_FORMAT_DIRSTAT |
3113 DIFF_FORMAT_SUMMARY |
3114 DIFF_FORMAT_PATCH);
3115
3116 /*
3117 * These cases always need recursive; we do not drop caller-supplied
3118 * recursive bits for other formats here.
3119 */
3120 if (options->output_format & (DIFF_FORMAT_PATCH |
3121 DIFF_FORMAT_NUMSTAT |
3122 DIFF_FORMAT_DIFFSTAT |
3123 DIFF_FORMAT_SHORTSTAT |
3124 DIFF_FORMAT_DIRSTAT |
3125 DIFF_FORMAT_SUMMARY |
3126 DIFF_FORMAT_CHECKDIFF))
3127 DIFF_OPT_SET(options, RECURSIVE);
3128 /*
3129 * Also pickaxe would not work very well if you do not say recursive
3130 */
3131 if (options->pickaxe)
3132 DIFF_OPT_SET(options, RECURSIVE);
3133 /*
3134 * When patches are generated, submodules diffed against the work tree
3135 * must be checked for dirtiness too so it can be shown in the output
3136 */
3137 if (options->output_format & DIFF_FORMAT_PATCH)
3138 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3139
3140 if (options->detect_rename && options->rename_limit < 0)
3141 options->rename_limit = diff_rename_limit_default;
3142 if (options->setup & DIFF_SETUP_USE_CACHE) {
3143 if (!active_cache)
3144 /* read-cache does not die even when it fails
3145 * so it is safe for us to do this here. Also
3146 * it does not smudge active_cache or active_nr
3147 * when it fails, so we do not have to worry about
3148 * cleaning it up ourselves either.
3149 */
3150 read_cache();
3151 }
3152 if (options->abbrev <= 0 || 40 < options->abbrev)
3153 options->abbrev = 40; /* full */
3154
3155 /*
3156 * It does not make sense to show the first hit we happened
3157 * to have found. It does not make sense not to return with
3158 * exit code in such a case either.
3159 */
3160 if (DIFF_OPT_TST(options, QUICK)) {
3161 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3162 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3163 }
3164
3165 return 0;
3166 }
3167
3168 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3169 {
3170 char c, *eq;
3171 int len;
3172
3173 if (*arg != '-')
3174 return 0;
3175 c = *++arg;
3176 if (!c)
3177 return 0;
3178 if (c == arg_short) {
3179 c = *++arg;
3180 if (!c)
3181 return 1;
3182 if (val && isdigit(c)) {
3183 char *end;
3184 int n = strtoul(arg, &end, 10);
3185 if (*end)
3186 return 0;
3187 *val = n;
3188 return 1;
3189 }
3190 return 0;
3191 }
3192 if (c != '-')
3193 return 0;
3194 arg++;
3195 eq = strchr(arg, '=');
3196 if (eq)
3197 len = eq - arg;
3198 else
3199 len = strlen(arg);
3200 if (!len || strncmp(arg, arg_long, len))
3201 return 0;
3202 if (eq) {
3203 int n;
3204 char *end;
3205 if (!isdigit(*++eq))
3206 return 0;
3207 n = strtoul(eq, &end, 10);
3208 if (*end)
3209 return 0;
3210 *val = n;
3211 }
3212 return 1;
3213 }
3214
3215 static int diff_scoreopt_parse(const char *opt);
3216
3217 static inline int short_opt(char opt, const char **argv,
3218 const char **optarg)
3219 {
3220 const char *arg = argv[0];
3221 if (arg[0] != '-' || arg[1] != opt)
3222 return 0;
3223 if (arg[2] != '\0') {
3224 *optarg = arg + 2;
3225 return 1;
3226 }
3227 if (!argv[1])
3228 die("Option '%c' requires a value", opt);
3229 *optarg = argv[1];
3230 return 2;
3231 }
3232
3233 int parse_long_opt(const char *opt, const char **argv,
3234 const char **optarg)
3235 {
3236 const char *arg = argv[0];
3237 if (arg[0] != '-' || arg[1] != '-')
3238 return 0;
3239 arg += strlen("--");
3240 if (prefixcmp(arg, opt))
3241 return 0;
3242 arg += strlen(opt);
3243 if (*arg == '=') { /* sticked form: --option=value */
3244 *optarg = arg + 1;
3245 return 1;
3246 }
3247 if (*arg != '\0')
3248 return 0;
3249 /* separate form: --option value */
3250 if (!argv[1])
3251 die("Option '--%s' requires a value", opt);
3252 *optarg = argv[1];
3253 return 2;
3254 }
3255
3256 static int stat_opt(struct diff_options *options, const char **av)
3257 {
3258 const char *arg = av[0];
3259 char *end;
3260 int width = options->stat_width;
3261 int name_width = options->stat_name_width;
3262 int count = options->stat_count;
3263 int argcount = 1;
3264
3265 arg += strlen("--stat");
3266 end = (char *)arg;
3267
3268 switch (*arg) {
3269 case '-':
3270 if (!prefixcmp(arg, "-width")) {
3271 arg += strlen("-width");
3272 if (*arg == '=')
3273 width = strtoul(arg + 1, &end, 10);
3274 else if (!*arg && !av[1])
3275 die("Option '--stat-width' requires a value");
3276 else if (!*arg) {
3277 width = strtoul(av[1], &end, 10);
3278 argcount = 2;
3279 }
3280 } else if (!prefixcmp(arg, "-name-width")) {
3281 arg += strlen("-name-width");
3282 if (*arg == '=')
3283 name_width = strtoul(arg + 1, &end, 10);
3284 else if (!*arg && !av[1])
3285 die("Option '--stat-name-width' requires a value");
3286 else if (!*arg) {
3287 name_width = strtoul(av[1], &end, 10);
3288 argcount = 2;
3289 }
3290 } else if (!prefixcmp(arg, "-count")) {
3291 arg += strlen("-count");
3292 if (*arg == '=')
3293 count = strtoul(arg + 1, &end, 10);
3294 else if (!*arg && !av[1])
3295 die("Option '--stat-count' requires a value");
3296 else if (!*arg) {
3297 count = strtoul(av[1], &end, 10);
3298 argcount = 2;
3299 }
3300 }
3301 break;
3302 case '=':
3303 width = strtoul(arg+1, &end, 10);
3304 if (*end == ',')
3305 name_width = strtoul(end+1, &end, 10);
3306 if (*end == ',')
3307 count = strtoul(end+1, &end, 10);
3308 }
3309
3310 /* Important! This checks all the error cases! */
3311 if (*end)
3312 return 0;
3313 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3314 options->stat_name_width = name_width;
3315 options->stat_width = width;
3316 options->stat_count = count;
3317 return argcount;
3318 }
3319
3320 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3321 {
3322 struct strbuf errmsg = STRBUF_INIT;
3323 if (parse_dirstat_params(options, params, &errmsg))
3324 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3325 errmsg.buf);
3326 strbuf_release(&errmsg);
3327 /*
3328 * The caller knows a dirstat-related option is given from the command
3329 * line; allow it to say "return this_function();"
3330 */
3331 options->output_format |= DIFF_FORMAT_DIRSTAT;
3332 return 1;
3333 }
3334
3335 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3336 {
3337 const char *arg = av[0];
3338 const char *optarg;
3339 int argcount;
3340
3341 /* Output format options */
3342 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3343 options->output_format |= DIFF_FORMAT_PATCH;
3344 else if (opt_arg(arg, 'U', "unified", &options->context))
3345 options->output_format |= DIFF_FORMAT_PATCH;
3346 else if (!strcmp(arg, "--raw"))
3347 options->output_format |= DIFF_FORMAT_RAW;
3348 else if (!strcmp(arg, "--patch-with-raw"))
3349 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3350 else if (!strcmp(arg, "--numstat"))
3351 options->output_format |= DIFF_FORMAT_NUMSTAT;
3352 else if (!strcmp(arg, "--shortstat"))
3353 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3354 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3355 return parse_dirstat_opt(options, "");
3356 else if (!prefixcmp(arg, "-X"))
3357 return parse_dirstat_opt(options, arg + 2);
3358 else if (!prefixcmp(arg, "--dirstat="))
3359 return parse_dirstat_opt(options, arg + 10);
3360 else if (!strcmp(arg, "--cumulative"))
3361 return parse_dirstat_opt(options, "cumulative");
3362 else if (!strcmp(arg, "--dirstat-by-file"))
3363 return parse_dirstat_opt(options, "files");
3364 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3365 parse_dirstat_opt(options, "files");
3366 return parse_dirstat_opt(options, arg + 18);
3367 }
3368 else if (!strcmp(arg, "--check"))
3369 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3370 else if (!strcmp(arg, "--summary"))
3371 options->output_format |= DIFF_FORMAT_SUMMARY;
3372 else if (!strcmp(arg, "--patch-with-stat"))
3373 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3374 else if (!strcmp(arg, "--name-only"))
3375 options->output_format |= DIFF_FORMAT_NAME;
3376 else if (!strcmp(arg, "--name-status"))
3377 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3378 else if (!strcmp(arg, "-s"))
3379 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3380 else if (!prefixcmp(arg, "--stat"))
3381 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3382 return stat_opt(options, av);
3383
3384 /* renames options */
3385 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3386 !strcmp(arg, "--break-rewrites")) {
3387 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3388 return error("invalid argument to -B: %s", arg+2);
3389 }
3390 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3391 !strcmp(arg, "--find-renames")) {
3392 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3393 return error("invalid argument to -M: %s", arg+2);
3394 options->detect_rename = DIFF_DETECT_RENAME;
3395 }
3396 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3397 options->irreversible_delete = 1;
3398 }
3399 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3400 !strcmp(arg, "--find-copies")) {
3401 if (options->detect_rename == DIFF_DETECT_COPY)
3402 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3403 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3404 return error("invalid argument to -C: %s", arg+2);
3405 options->detect_rename = DIFF_DETECT_COPY;
3406 }
3407 else if (!strcmp(arg, "--no-renames"))
3408 options->detect_rename = 0;
3409 else if (!strcmp(arg, "--relative"))
3410 DIFF_OPT_SET(options, RELATIVE_NAME);
3411 else if (!prefixcmp(arg, "--relative=")) {
3412 DIFF_OPT_SET(options, RELATIVE_NAME);
3413 options->prefix = arg + 11;
3414 }
3415
3416 /* xdiff options */
3417 else if (!strcmp(arg, "--minimal"))
3418 DIFF_XDL_SET(options, NEED_MINIMAL);
3419 else if (!strcmp(arg, "--no-minimal"))
3420 DIFF_XDL_CLR(options, NEED_MINIMAL);
3421 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3422 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3423 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3424 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3425 else if (!strcmp(arg, "--ignore-space-at-eol"))
3426 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3427 else if (!strcmp(arg, "--patience"))
3428 DIFF_XDL_SET(options, PATIENCE_DIFF);
3429 else if (!strcmp(arg, "--histogram"))
3430 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3431
3432 /* flags options */
3433 else if (!strcmp(arg, "--binary")) {
3434 options->output_format |= DIFF_FORMAT_PATCH;
3435 DIFF_OPT_SET(options, BINARY);
3436 }
3437 else if (!strcmp(arg, "--full-index"))
3438 DIFF_OPT_SET(options, FULL_INDEX);
3439 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3440 DIFF_OPT_SET(options, TEXT);
3441 else if (!strcmp(arg, "-R"))
3442 DIFF_OPT_SET(options, REVERSE_DIFF);
3443 else if (!strcmp(arg, "--find-copies-harder"))
3444 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3445 else if (!strcmp(arg, "--follow"))
3446 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3447 else if (!strcmp(arg, "--color"))
3448 options->use_color = 1;
3449 else if (!prefixcmp(arg, "--color=")) {
3450 int value = git_config_colorbool(NULL, arg+8);
3451 if (value < 0)
3452 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3453 options->use_color = value;
3454 }
3455 else if (!strcmp(arg, "--no-color"))
3456 options->use_color = 0;
3457 else if (!strcmp(arg, "--color-words")) {
3458 options->use_color = 1;
3459 options->word_diff = DIFF_WORDS_COLOR;
3460 }
3461 else if (!prefixcmp(arg, "--color-words=")) {
3462 options->use_color = 1;
3463 options->word_diff = DIFF_WORDS_COLOR;
3464 options->word_regex = arg + 14;
3465 }
3466 else if (!strcmp(arg, "--word-diff")) {
3467 if (options->word_diff == DIFF_WORDS_NONE)
3468 options->word_diff = DIFF_WORDS_PLAIN;
3469 }
3470 else if (!prefixcmp(arg, "--word-diff=")) {
3471 const char *type = arg + 12;
3472 if (!strcmp(type, "plain"))
3473 options->word_diff = DIFF_WORDS_PLAIN;
3474 else if (!strcmp(type, "color")) {
3475 options->use_color = 1;
3476 options->word_diff = DIFF_WORDS_COLOR;
3477 }
3478 else if (!strcmp(type, "porcelain"))
3479 options->word_diff = DIFF_WORDS_PORCELAIN;
3480 else if (!strcmp(type, "none"))
3481 options->word_diff = DIFF_WORDS_NONE;
3482 else
3483 die("bad --word-diff argument: %s", type);
3484 }
3485 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3486 if (options->word_diff == DIFF_WORDS_NONE)
3487 options->word_diff = DIFF_WORDS_PLAIN;
3488 options->word_regex = optarg;
3489 return argcount;
3490 }
3491 else if (!strcmp(arg, "--exit-code"))
3492 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3493 else if (!strcmp(arg, "--quiet"))
3494 DIFF_OPT_SET(options, QUICK);
3495 else if (!strcmp(arg, "--ext-diff"))
3496 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3497 else if (!strcmp(arg, "--no-ext-diff"))
3498 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3499 else if (!strcmp(arg, "--textconv"))
3500 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3501 else if (!strcmp(arg, "--no-textconv"))
3502 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3503 else if (!strcmp(arg, "--ignore-submodules")) {
3504 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3505 handle_ignore_submodules_arg(options, "all");
3506 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3507 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3508 handle_ignore_submodules_arg(options, arg + 20);
3509 } else if (!strcmp(arg, "--submodule"))
3510 DIFF_OPT_SET(options, SUBMODULE_LOG);
3511 else if (!prefixcmp(arg, "--submodule=")) {
3512 if (!strcmp(arg + 12, "log"))
3513 DIFF_OPT_SET(options, SUBMODULE_LOG);
3514 }
3515
3516 /* misc options */
3517 else if (!strcmp(arg, "-z"))
3518 options->line_termination = 0;
3519 else if ((argcount = short_opt('l', av, &optarg))) {
3520 options->rename_limit = strtoul(optarg, NULL, 10);
3521 return argcount;
3522 }
3523 else if ((argcount = short_opt('S', av, &optarg))) {
3524 options->pickaxe = optarg;
3525 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3526 return argcount;
3527 } else if ((argcount = short_opt('G', av, &optarg))) {
3528 options->pickaxe = optarg;
3529 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3530 return argcount;
3531 }
3532 else if (!strcmp(arg, "--pickaxe-all"))
3533 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3534 else if (!strcmp(arg, "--pickaxe-regex"))
3535 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3536 else if ((argcount = short_opt('O', av, &optarg))) {
3537 options->orderfile = optarg;
3538 return argcount;
3539 }
3540 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3541 options->filter = optarg;
3542 return argcount;
3543 }
3544 else if (!strcmp(arg, "--abbrev"))
3545 options->abbrev = DEFAULT_ABBREV;
3546 else if (!prefixcmp(arg, "--abbrev=")) {
3547 options->abbrev = strtoul(arg + 9, NULL, 10);
3548 if (options->abbrev < MINIMUM_ABBREV)
3549 options->abbrev = MINIMUM_ABBREV;
3550 else if (40 < options->abbrev)
3551 options->abbrev = 40;
3552 }
3553 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3554 options->a_prefix = optarg;
3555 return argcount;
3556 }
3557 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3558 options->b_prefix = optarg;
3559 return argcount;
3560 }
3561 else if (!strcmp(arg, "--no-prefix"))
3562 options->a_prefix = options->b_prefix = "";
3563 else if (opt_arg(arg, '\0', "inter-hunk-context",
3564 &options->interhunkcontext))
3565 ;
3566 else if (!strcmp(arg, "-W"))
3567 DIFF_OPT_SET(options, FUNCCONTEXT);
3568 else if (!strcmp(arg, "--function-context"))
3569 DIFF_OPT_SET(options, FUNCCONTEXT);
3570 else if (!strcmp(arg, "--no-function-context"))
3571 DIFF_OPT_CLR(options, FUNCCONTEXT);
3572 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3573 options->file = fopen(optarg, "w");
3574 if (!options->file)
3575 die_errno("Could not open '%s'", optarg);
3576 options->close_file = 1;
3577 return argcount;
3578 } else
3579 return 0;
3580 return 1;
3581 }
3582
3583 int parse_rename_score(const char **cp_p)
3584 {
3585 unsigned long num, scale;
3586 int ch, dot;
3587 const char *cp = *cp_p;
3588
3589 num = 0;
3590 scale = 1;
3591 dot = 0;
3592 for (;;) {
3593 ch = *cp;
3594 if ( !dot && ch == '.' ) {
3595 scale = 1;
3596 dot = 1;
3597 } else if ( ch == '%' ) {
3598 scale = dot ? scale*100 : 100;
3599 cp++; /* % is always at the end */
3600 break;
3601 } else if ( ch >= '0' && ch <= '9' ) {
3602 if ( scale < 100000 ) {
3603 scale *= 10;
3604 num = (num*10) + (ch-'0');
3605 }
3606 } else {
3607 break;
3608 }
3609 cp++;
3610 }
3611 *cp_p = cp;
3612
3613 /* user says num divided by scale and we say internally that
3614 * is MAX_SCORE * num / scale.
3615 */
3616 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3617 }
3618
3619 static int diff_scoreopt_parse(const char *opt)
3620 {
3621 int opt1, opt2, cmd;
3622
3623 if (*opt++ != '-')
3624 return -1;
3625 cmd = *opt++;
3626 if (cmd == '-') {
3627 /* convert the long-form arguments into short-form versions */
3628 if (!prefixcmp(opt, "break-rewrites")) {
3629 opt += strlen("break-rewrites");
3630 if (*opt == 0 || *opt++ == '=')
3631 cmd = 'B';
3632 } else if (!prefixcmp(opt, "find-copies")) {
3633 opt += strlen("find-copies");
3634 if (*opt == 0 || *opt++ == '=')
3635 cmd = 'C';
3636 } else if (!prefixcmp(opt, "find-renames")) {
3637 opt += strlen("find-renames");
3638 if (*opt == 0 || *opt++ == '=')
3639 cmd = 'M';
3640 }
3641 }
3642 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3643 return -1; /* that is not a -M, -C nor -B option */
3644
3645 opt1 = parse_rename_score(&opt);
3646 if (cmd != 'B')
3647 opt2 = 0;
3648 else {
3649 if (*opt == 0)
3650 opt2 = 0;
3651 else if (*opt != '/')
3652 return -1; /* we expect -B80/99 or -B80 */
3653 else {
3654 opt++;
3655 opt2 = parse_rename_score(&opt);
3656 }
3657 }
3658 if (*opt != 0)
3659 return -1;
3660 return opt1 | (opt2 << 16);
3661 }
3662
3663 struct diff_queue_struct diff_queued_diff;
3664
3665 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3666 {
3667 if (queue->alloc <= queue->nr) {
3668 queue->alloc = alloc_nr(queue->alloc);
3669 queue->queue = xrealloc(queue->queue,
3670 sizeof(dp) * queue->alloc);
3671 }
3672 queue->queue[queue->nr++] = dp;
3673 }
3674
3675 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3676 struct diff_filespec *one,
3677 struct diff_filespec *two)
3678 {
3679 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3680 dp->one = one;
3681 dp->two = two;
3682 if (queue)
3683 diff_q(queue, dp);
3684 return dp;
3685 }
3686
3687 void diff_free_filepair(struct diff_filepair *p)
3688 {
3689 free_filespec(p->one);
3690 free_filespec(p->two);
3691 free(p);
3692 }
3693
3694 /* This is different from find_unique_abbrev() in that
3695 * it stuffs the result with dots for alignment.
3696 */
3697 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3698 {
3699 int abblen;
3700 const char *abbrev;
3701 if (len == 40)
3702 return sha1_to_hex(sha1);
3703
3704 abbrev = find_unique_abbrev(sha1, len);
3705 abblen = strlen(abbrev);
3706 if (abblen < 37) {
3707 static char hex[41];
3708 if (len < abblen && abblen <= len + 2)
3709 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3710 else
3711 sprintf(hex, "%s...", abbrev);
3712 return hex;
3713 }
3714 return sha1_to_hex(sha1);
3715 }
3716
3717 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3718 {
3719 int line_termination = opt->line_termination;
3720 int inter_name_termination = line_termination ? '\t' : '\0';
3721 if (opt->output_prefix) {
3722 struct strbuf *msg = NULL;
3723 msg = opt->output_prefix(opt, opt->output_prefix_data);
3724 fprintf(opt->file, "%s", msg->buf);
3725 }
3726
3727 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3728 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3729 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3730 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3731 }
3732 if (p->score) {
3733 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3734 inter_name_termination);
3735 } else {
3736 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3737 }
3738
3739 if (p->status == DIFF_STATUS_COPIED ||
3740 p->status == DIFF_STATUS_RENAMED) {
3741 const char *name_a, *name_b;
3742 name_a = p->one->path;
3743 name_b = p->two->path;
3744 strip_prefix(opt->prefix_length, &name_a, &name_b);
3745 write_name_quoted(name_a, opt->file, inter_name_termination);
3746 write_name_quoted(name_b, opt->file, line_termination);
3747 } else {
3748 const char *name_a, *name_b;
3749 name_a = p->one->mode ? p->one->path : p->two->path;
3750 name_b = NULL;
3751 strip_prefix(opt->prefix_length, &name_a, &name_b);
3752 write_name_quoted(name_a, opt->file, line_termination);
3753 }
3754 }
3755
3756 int diff_unmodified_pair(struct diff_filepair *p)
3757 {
3758 /* This function is written stricter than necessary to support
3759 * the currently implemented transformers, but the idea is to
3760 * let transformers to produce diff_filepairs any way they want,
3761 * and filter and clean them up here before producing the output.
3762 */
3763 struct diff_filespec *one = p->one, *two = p->two;
3764
3765 if (DIFF_PAIR_UNMERGED(p))
3766 return 0; /* unmerged is interesting */
3767
3768 /* deletion, addition, mode or type change
3769 * and rename are all interesting.
3770 */
3771 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3772 DIFF_PAIR_MODE_CHANGED(p) ||
3773 strcmp(one->path, two->path))
3774 return 0;
3775
3776 /* both are valid and point at the same path. that is, we are
3777 * dealing with a change.
3778 */
3779 if (one->sha1_valid && two->sha1_valid &&
3780 !hashcmp(one->sha1, two->sha1) &&
3781 !one->dirty_submodule && !two->dirty_submodule)
3782 return 1; /* no change */
3783 if (!one->sha1_valid && !two->sha1_valid)
3784 return 1; /* both look at the same file on the filesystem. */
3785 return 0;
3786 }
3787
3788 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3789 {
3790 if (diff_unmodified_pair(p))
3791 return;
3792
3793 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3794 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3795 return; /* no tree diffs in patch format */
3796
3797 run_diff(p, o);
3798 }
3799
3800 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3801 struct diffstat_t *diffstat)
3802 {
3803 if (diff_unmodified_pair(p))
3804 return;
3805
3806 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3807 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3808 return; /* no useful stat for tree diffs */
3809
3810 run_diffstat(p, o, diffstat);
3811 }
3812
3813 static void diff_flush_checkdiff(struct diff_filepair *p,
3814 struct diff_options *o)
3815 {
3816 if (diff_unmodified_pair(p))
3817 return;
3818
3819 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3820 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3821 return; /* nothing to check in tree diffs */
3822
3823 run_checkdiff(p, o);
3824 }
3825
3826 int diff_queue_is_empty(void)
3827 {
3828 struct diff_queue_struct *q = &diff_queued_diff;
3829 int i;
3830 for (i = 0; i < q->nr; i++)
3831 if (!diff_unmodified_pair(q->queue[i]))
3832 return 0;
3833 return 1;
3834 }
3835
3836 #if DIFF_DEBUG
3837 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3838 {
3839 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3840 x, one ? one : "",
3841 s->path,
3842 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3843 s->mode,
3844 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3845 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3846 x, one ? one : "",
3847 s->size, s->xfrm_flags);
3848 }
3849
3850 void diff_debug_filepair(const struct diff_filepair *p, int i)
3851 {
3852 diff_debug_filespec(p->one, i, "one");
3853 diff_debug_filespec(p->two, i, "two");
3854 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3855 p->score, p->status ? p->status : '?',
3856 p->one->rename_used, p->broken_pair);
3857 }
3858
3859 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3860 {
3861 int i;
3862 if (msg)
3863 fprintf(stderr, "%s\n", msg);
3864 fprintf(stderr, "q->nr = %d\n", q->nr);
3865 for (i = 0; i < q->nr; i++) {
3866 struct diff_filepair *p = q->queue[i];
3867 diff_debug_filepair(p, i);
3868 }
3869 }
3870 #endif
3871
3872 static void diff_resolve_rename_copy(void)
3873 {
3874 int i;
3875 struct diff_filepair *p;
3876 struct diff_queue_struct *q = &diff_queued_diff;
3877
3878 diff_debug_queue("resolve-rename-copy", q);
3879
3880 for (i = 0; i < q->nr; i++) {
3881 p = q->queue[i];
3882 p->status = 0; /* undecided */
3883 if (DIFF_PAIR_UNMERGED(p))
3884 p->status = DIFF_STATUS_UNMERGED;
3885 else if (!DIFF_FILE_VALID(p->one))
3886 p->status = DIFF_STATUS_ADDED;
3887 else if (!DIFF_FILE_VALID(p->two))
3888 p->status = DIFF_STATUS_DELETED;
3889 else if (DIFF_PAIR_TYPE_CHANGED(p))
3890 p->status = DIFF_STATUS_TYPE_CHANGED;
3891
3892 /* from this point on, we are dealing with a pair
3893 * whose both sides are valid and of the same type, i.e.
3894 * either in-place edit or rename/copy edit.
3895 */
3896 else if (DIFF_PAIR_RENAME(p)) {
3897 /*
3898 * A rename might have re-connected a broken
3899 * pair up, causing the pathnames to be the
3900 * same again. If so, that's not a rename at
3901 * all, just a modification..
3902 *
3903 * Otherwise, see if this source was used for
3904 * multiple renames, in which case we decrement
3905 * the count, and call it a copy.
3906 */
3907 if (!strcmp(p->one->path, p->two->path))
3908 p->status = DIFF_STATUS_MODIFIED;
3909 else if (--p->one->rename_used > 0)
3910 p->status = DIFF_STATUS_COPIED;
3911 else
3912 p->status = DIFF_STATUS_RENAMED;
3913 }
3914 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3915 p->one->mode != p->two->mode ||
3916 p->one->dirty_submodule ||
3917 p->two->dirty_submodule ||
3918 is_null_sha1(p->one->sha1))
3919 p->status = DIFF_STATUS_MODIFIED;
3920 else {
3921 /* This is a "no-change" entry and should not
3922 * happen anymore, but prepare for broken callers.
3923 */
3924 error("feeding unmodified %s to diffcore",
3925 p->one->path);
3926 p->status = DIFF_STATUS_UNKNOWN;
3927 }
3928 }
3929 diff_debug_queue("resolve-rename-copy done", q);
3930 }
3931
3932 static int check_pair_status(struct diff_filepair *p)
3933 {
3934 switch (p->status) {
3935 case DIFF_STATUS_UNKNOWN:
3936 return 0;
3937 case 0:
3938 die("internal error in diff-resolve-rename-copy");
3939 default:
3940 return 1;
3941 }
3942 }
3943
3944 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3945 {
3946 int fmt = opt->output_format;
3947
3948 if (fmt & DIFF_FORMAT_CHECKDIFF)
3949 diff_flush_checkdiff(p, opt);
3950 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3951 diff_flush_raw(p, opt);
3952 else if (fmt & DIFF_FORMAT_NAME) {
3953 const char *name_a, *name_b;
3954 name_a = p->two->path;
3955 name_b = NULL;
3956 strip_prefix(opt->prefix_length, &name_a, &name_b);
3957 write_name_quoted(name_a, opt->file, opt->line_termination);
3958 }
3959 }
3960
3961 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3962 {
3963 if (fs->mode)
3964 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3965 else
3966 fprintf(file, " %s ", newdelete);
3967 write_name_quoted(fs->path, file, '\n');
3968 }
3969
3970
3971 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3972 const char *line_prefix)
3973 {
3974 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3975 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3976 p->two->mode, show_name ? ' ' : '\n');
3977 if (show_name) {
3978 write_name_quoted(p->two->path, file, '\n');
3979 }
3980 }
3981 }
3982
3983 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3984 const char *line_prefix)
3985 {
3986 char *names = pprint_rename(p->one->path, p->two->path);
3987
3988 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3989 free(names);
3990 show_mode_change(file, p, 0, line_prefix);
3991 }
3992
3993 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3994 {
3995 FILE *file = opt->file;
3996 char *line_prefix = "";
3997
3998 if (opt->output_prefix) {
3999 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4000 line_prefix = buf->buf;
4001 }
4002
4003 switch(p->status) {
4004 case DIFF_STATUS_DELETED:
4005 fputs(line_prefix, file);
4006 show_file_mode_name(file, "delete", p->one);
4007 break;
4008 case DIFF_STATUS_ADDED:
4009 fputs(line_prefix, file);
4010 show_file_mode_name(file, "create", p->two);
4011 break;
4012 case DIFF_STATUS_COPIED:
4013 fputs(line_prefix, file);
4014 show_rename_copy(file, "copy", p, line_prefix);
4015 break;
4016 case DIFF_STATUS_RENAMED:
4017 fputs(line_prefix, file);
4018 show_rename_copy(file, "rename", p, line_prefix);
4019 break;
4020 default:
4021 if (p->score) {
4022 fprintf(file, "%s rewrite ", line_prefix);
4023 write_name_quoted(p->two->path, file, ' ');
4024 fprintf(file, "(%d%%)\n", similarity_index(p));
4025 }
4026 show_mode_change(file, p, !p->score, line_prefix);
4027 break;
4028 }
4029 }
4030
4031 struct patch_id_t {
4032 git_SHA_CTX *ctx;
4033 int patchlen;
4034 };
4035
4036 static int remove_space(char *line, int len)
4037 {
4038 int i;
4039 char *dst = line;
4040 unsigned char c;
4041
4042 for (i = 0; i < len; i++)
4043 if (!isspace((c = line[i])))
4044 *dst++ = c;
4045
4046 return dst - line;
4047 }
4048
4049 static void patch_id_consume(void *priv, char *line, unsigned long len)
4050 {
4051 struct patch_id_t *data = priv;
4052 int new_len;
4053
4054 /* Ignore line numbers when computing the SHA1 of the patch */
4055 if (!prefixcmp(line, "@@ -"))
4056 return;
4057
4058 new_len = remove_space(line, len);
4059
4060 git_SHA1_Update(data->ctx, line, new_len);
4061 data->patchlen += new_len;
4062 }
4063
4064 /* returns 0 upon success, and writes result into sha1 */
4065 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4066 {
4067 struct diff_queue_struct *q = &diff_queued_diff;
4068 int i;
4069 git_SHA_CTX ctx;
4070 struct patch_id_t data;
4071 char buffer[PATH_MAX * 4 + 20];
4072
4073 git_SHA1_Init(&ctx);
4074 memset(&data, 0, sizeof(struct patch_id_t));
4075 data.ctx = &ctx;
4076
4077 for (i = 0; i < q->nr; i++) {
4078 xpparam_t xpp;
4079 xdemitconf_t xecfg;
4080 mmfile_t mf1, mf2;
4081 struct diff_filepair *p = q->queue[i];
4082 int len1, len2;
4083
4084 memset(&xpp, 0, sizeof(xpp));
4085 memset(&xecfg, 0, sizeof(xecfg));
4086 if (p->status == 0)
4087 return error("internal diff status error");
4088 if (p->status == DIFF_STATUS_UNKNOWN)
4089 continue;
4090 if (diff_unmodified_pair(p))
4091 continue;
4092 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4093 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4094 continue;
4095 if (DIFF_PAIR_UNMERGED(p))
4096 continue;
4097
4098 diff_fill_sha1_info(p->one);
4099 diff_fill_sha1_info(p->two);
4100 if (fill_mmfile(&mf1, p->one) < 0 ||
4101 fill_mmfile(&mf2, p->two) < 0)
4102 return error("unable to read files to diff");
4103
4104 len1 = remove_space(p->one->path, strlen(p->one->path));
4105 len2 = remove_space(p->two->path, strlen(p->two->path));
4106 if (p->one->mode == 0)
4107 len1 = snprintf(buffer, sizeof(buffer),
4108 "diff--gita/%.*sb/%.*s"
4109 "newfilemode%06o"
4110 "---/dev/null"
4111 "+++b/%.*s",
4112 len1, p->one->path,
4113 len2, p->two->path,
4114 p->two->mode,
4115 len2, p->two->path);
4116 else if (p->two->mode == 0)
4117 len1 = snprintf(buffer, sizeof(buffer),
4118 "diff--gita/%.*sb/%.*s"
4119 "deletedfilemode%06o"
4120 "---a/%.*s"
4121 "+++/dev/null",
4122 len1, p->one->path,
4123 len2, p->two->path,
4124 p->one->mode,
4125 len1, p->one->path);
4126 else
4127 len1 = snprintf(buffer, sizeof(buffer),
4128 "diff--gita/%.*sb/%.*s"
4129 "---a/%.*s"
4130 "+++b/%.*s",
4131 len1, p->one->path,
4132 len2, p->two->path,
4133 len1, p->one->path,
4134 len2, p->two->path);
4135 git_SHA1_Update(&ctx, buffer, len1);
4136
4137 if (diff_filespec_is_binary(p->one) ||
4138 diff_filespec_is_binary(p->two)) {
4139 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4140 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4141 continue;
4142 }
4143
4144 xpp.flags = 0;
4145 xecfg.ctxlen = 3;
4146 xecfg.flags = 0;
4147 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4148 &xpp, &xecfg);
4149 }
4150
4151 git_SHA1_Final(sha1, &ctx);
4152 return 0;
4153 }
4154
4155 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4156 {
4157 struct diff_queue_struct *q = &diff_queued_diff;
4158 int i;
4159 int result = diff_get_patch_id(options, sha1);
4160
4161 for (i = 0; i < q->nr; i++)
4162 diff_free_filepair(q->queue[i]);
4163
4164 free(q->queue);
4165 DIFF_QUEUE_CLEAR(q);
4166
4167 return result;
4168 }
4169
4170 static int is_summary_empty(const struct diff_queue_struct *q)
4171 {
4172 int i;
4173
4174 for (i = 0; i < q->nr; i++) {
4175 const struct diff_filepair *p = q->queue[i];
4176
4177 switch (p->status) {
4178 case DIFF_STATUS_DELETED:
4179 case DIFF_STATUS_ADDED:
4180 case DIFF_STATUS_COPIED:
4181 case DIFF_STATUS_RENAMED:
4182 return 0;
4183 default:
4184 if (p->score)
4185 return 0;
4186 if (p->one->mode && p->two->mode &&
4187 p->one->mode != p->two->mode)
4188 return 0;
4189 break;
4190 }
4191 }
4192 return 1;
4193 }
4194
4195 static const char rename_limit_warning[] =
4196 "inexact rename detection was skipped due to too many files.";
4197
4198 static const char degrade_cc_to_c_warning[] =
4199 "only found copies from modified paths due to too many files.";
4200
4201 static const char rename_limit_advice[] =
4202 "you may want to set your %s variable to at least "
4203 "%d and retry the command.";
4204
4205 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4206 {
4207 if (degraded_cc)
4208 warning(degrade_cc_to_c_warning);
4209 else if (needed)
4210 warning(rename_limit_warning);
4211 else
4212 return;
4213 if (0 < needed && needed < 32767)
4214 warning(rename_limit_advice, varname, needed);
4215 }
4216
4217 void diff_flush(struct diff_options *options)
4218 {
4219 struct diff_queue_struct *q = &diff_queued_diff;
4220 int i, output_format = options->output_format;
4221 int separator = 0;
4222 int dirstat_by_line = 0;
4223
4224 /*
4225 * Order: raw, stat, summary, patch
4226 * or: name/name-status/checkdiff (other bits clear)
4227 */
4228 if (!q->nr)
4229 goto free_queue;
4230
4231 if (output_format & (DIFF_FORMAT_RAW |
4232 DIFF_FORMAT_NAME |
4233 DIFF_FORMAT_NAME_STATUS |
4234 DIFF_FORMAT_CHECKDIFF)) {
4235 for (i = 0; i < q->nr; i++) {
4236 struct diff_filepair *p = q->queue[i];
4237 if (check_pair_status(p))
4238 flush_one_pair(p, options);
4239 }
4240 separator++;
4241 }
4242
4243 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4244 dirstat_by_line = 1;
4245
4246 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4247 dirstat_by_line) {
4248 struct diffstat_t diffstat;
4249
4250 memset(&diffstat, 0, sizeof(struct diffstat_t));
4251 for (i = 0; i < q->nr; i++) {
4252 struct diff_filepair *p = q->queue[i];
4253 if (check_pair_status(p))
4254 diff_flush_stat(p, options, &diffstat);
4255 }
4256 if (output_format & DIFF_FORMAT_NUMSTAT)
4257 show_numstat(&diffstat, options);
4258 if (output_format & DIFF_FORMAT_DIFFSTAT)
4259 show_stats(&diffstat, options);
4260 if (output_format & DIFF_FORMAT_SHORTSTAT)
4261 show_shortstats(&diffstat, options);
4262 if (output_format & DIFF_FORMAT_DIRSTAT)
4263 show_dirstat_by_line(&diffstat, options);
4264 free_diffstat_info(&diffstat);
4265 separator++;
4266 }
4267 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4268 show_dirstat(options);
4269
4270 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4271 for (i = 0; i < q->nr; i++) {
4272 diff_summary(options, q->queue[i]);
4273 }
4274 separator++;
4275 }
4276
4277 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4278 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4279 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4280 /*
4281 * run diff_flush_patch for the exit status. setting
4282 * options->file to /dev/null should be safe, becaue we
4283 * aren't supposed to produce any output anyway.
4284 */
4285 if (options->close_file)
4286 fclose(options->file);
4287 options->file = fopen("/dev/null", "w");
4288 if (!options->file)
4289 die_errno("Could not open /dev/null");
4290 options->close_file = 1;
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_patch(p, options);
4295 if (options->found_changes)
4296 break;
4297 }
4298 }
4299
4300 if (output_format & DIFF_FORMAT_PATCH) {
4301 if (separator) {
4302 putc(options->line_termination, options->file);
4303 if (options->stat_sep) {
4304 /* attach patch instead of inline */
4305 fputs(options->stat_sep, options->file);
4306 }
4307 }
4308
4309 for (i = 0; i < q->nr; i++) {
4310 struct diff_filepair *p = q->queue[i];
4311 if (check_pair_status(p))
4312 diff_flush_patch(p, options);
4313 }
4314 }
4315
4316 if (output_format & DIFF_FORMAT_CALLBACK)
4317 options->format_callback(q, options, options->format_callback_data);
4318
4319 for (i = 0; i < q->nr; i++)
4320 diff_free_filepair(q->queue[i]);
4321 free_queue:
4322 free(q->queue);
4323 DIFF_QUEUE_CLEAR(q);
4324 if (options->close_file)
4325 fclose(options->file);
4326
4327 /*
4328 * Report the content-level differences with HAS_CHANGES;
4329 * diff_addremove/diff_change does not set the bit when
4330 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4331 */
4332 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4333 if (options->found_changes)
4334 DIFF_OPT_SET(options, HAS_CHANGES);
4335 else
4336 DIFF_OPT_CLR(options, HAS_CHANGES);
4337 }
4338 }
4339
4340 static void diffcore_apply_filter(const char *filter)
4341 {
4342 int i;
4343 struct diff_queue_struct *q = &diff_queued_diff;
4344 struct diff_queue_struct outq;
4345 DIFF_QUEUE_CLEAR(&outq);
4346
4347 if (!filter)
4348 return;
4349
4350 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4351 int found;
4352 for (i = found = 0; !found && i < q->nr; i++) {
4353 struct diff_filepair *p = q->queue[i];
4354 if (((p->status == DIFF_STATUS_MODIFIED) &&
4355 ((p->score &&
4356 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4357 (!p->score &&
4358 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4359 ((p->status != DIFF_STATUS_MODIFIED) &&
4360 strchr(filter, p->status)))
4361 found++;
4362 }
4363 if (found)
4364 return;
4365
4366 /* otherwise we will clear the whole queue
4367 * by copying the empty outq at the end of this
4368 * function, but first clear the current entries
4369 * in the queue.
4370 */
4371 for (i = 0; i < q->nr; i++)
4372 diff_free_filepair(q->queue[i]);
4373 }
4374 else {
4375 /* Only the matching ones */
4376 for (i = 0; i < q->nr; i++) {
4377 struct diff_filepair *p = q->queue[i];
4378
4379 if (((p->status == DIFF_STATUS_MODIFIED) &&
4380 ((p->score &&
4381 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4382 (!p->score &&
4383 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4384 ((p->status != DIFF_STATUS_MODIFIED) &&
4385 strchr(filter, p->status)))
4386 diff_q(&outq, p);
4387 else
4388 diff_free_filepair(p);
4389 }
4390 }
4391 free(q->queue);
4392 *q = outq;
4393 }
4394
4395 /* Check whether two filespecs with the same mode and size are identical */
4396 static int diff_filespec_is_identical(struct diff_filespec *one,
4397 struct diff_filespec *two)
4398 {
4399 if (S_ISGITLINK(one->mode))
4400 return 0;
4401 if (diff_populate_filespec(one, 0))
4402 return 0;
4403 if (diff_populate_filespec(two, 0))
4404 return 0;
4405 return !memcmp(one->data, two->data, one->size);
4406 }
4407
4408 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4409 {
4410 int i;
4411 struct diff_queue_struct *q = &diff_queued_diff;
4412 struct diff_queue_struct outq;
4413 DIFF_QUEUE_CLEAR(&outq);
4414
4415 for (i = 0; i < q->nr; i++) {
4416 struct diff_filepair *p = q->queue[i];
4417
4418 /*
4419 * 1. Entries that come from stat info dirtiness
4420 * always have both sides (iow, not create/delete),
4421 * one side of the object name is unknown, with
4422 * the same mode and size. Keep the ones that
4423 * do not match these criteria. They have real
4424 * differences.
4425 *
4426 * 2. At this point, the file is known to be modified,
4427 * with the same mode and size, and the object
4428 * name of one side is unknown. Need to inspect
4429 * the identical contents.
4430 */
4431 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4432 !DIFF_FILE_VALID(p->two) ||
4433 (p->one->sha1_valid && p->two->sha1_valid) ||
4434 (p->one->mode != p->two->mode) ||
4435 diff_populate_filespec(p->one, 1) ||
4436 diff_populate_filespec(p->two, 1) ||
4437 (p->one->size != p->two->size) ||
4438 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4439 diff_q(&outq, p);
4440 else {
4441 /*
4442 * The caller can subtract 1 from skip_stat_unmatch
4443 * to determine how many paths were dirty only
4444 * due to stat info mismatch.
4445 */
4446 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4447 diffopt->skip_stat_unmatch++;
4448 diff_free_filepair(p);
4449 }
4450 }
4451 free(q->queue);
4452 *q = outq;
4453 }
4454
4455 static int diffnamecmp(const void *a_, const void *b_)
4456 {
4457 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4458 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4459 const char *name_a, *name_b;
4460
4461 name_a = a->one ? a->one->path : a->two->path;
4462 name_b = b->one ? b->one->path : b->two->path;
4463 return strcmp(name_a, name_b);
4464 }
4465
4466 void diffcore_fix_diff_index(struct diff_options *options)
4467 {
4468 struct diff_queue_struct *q = &diff_queued_diff;
4469 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4470 }
4471
4472 void diffcore_std(struct diff_options *options)
4473 {
4474 if (options->skip_stat_unmatch)
4475 diffcore_skip_stat_unmatch(options);
4476 if (!options->found_follow) {
4477 /* See try_to_follow_renames() in tree-diff.c */
4478 if (options->break_opt != -1)
4479 diffcore_break(options->break_opt);
4480 if (options->detect_rename)
4481 diffcore_rename(options);
4482 if (options->break_opt != -1)
4483 diffcore_merge_broken();
4484 }
4485 if (options->pickaxe)
4486 diffcore_pickaxe(options);
4487 if (options->orderfile)
4488 diffcore_order(options->orderfile);
4489 if (!options->found_follow)
4490 /* See try_to_follow_renames() in tree-diff.c */
4491 diff_resolve_rename_copy();
4492 diffcore_apply_filter(options->filter);
4493
4494 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4495 DIFF_OPT_SET(options, HAS_CHANGES);
4496 else
4497 DIFF_OPT_CLR(options, HAS_CHANGES);
4498
4499 options->found_follow = 0;
4500 }
4501
4502 int diff_result_code(struct diff_options *opt, int status)
4503 {
4504 int result = 0;
4505
4506 diff_warn_rename_limit("diff.renamelimit",
4507 opt->needed_rename_limit,
4508 opt->degraded_cc_to_c);
4509 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4510 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4511 return status;
4512 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4513 DIFF_OPT_TST(opt, HAS_CHANGES))
4514 result |= 01;
4515 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4516 DIFF_OPT_TST(opt, CHECK_FAILED))
4517 result |= 02;
4518 return result;
4519 }
4520
4521 int diff_can_quit_early(struct diff_options *opt)
4522 {
4523 return (DIFF_OPT_TST(opt, QUICK) &&
4524 !opt->filter &&
4525 DIFF_OPT_TST(opt, HAS_CHANGES));
4526 }
4527
4528 /*
4529 * Shall changes to this submodule be ignored?
4530 *
4531 * Submodule changes can be configured to be ignored separately for each path,
4532 * but that configuration can be overridden from the command line.
4533 */
4534 static int is_submodule_ignored(const char *path, struct diff_options *options)
4535 {
4536 int ignored = 0;
4537 unsigned orig_flags = options->flags;
4538 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4539 set_diffopt_flags_from_submodule_config(options, path);
4540 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4541 ignored = 1;
4542 options->flags = orig_flags;
4543 return ignored;
4544 }
4545
4546 void diff_addremove(struct diff_options *options,
4547 int addremove, unsigned mode,
4548 const unsigned char *sha1,
4549 const char *concatpath, unsigned dirty_submodule)
4550 {
4551 struct diff_filespec *one, *two;
4552
4553 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4554 return;
4555
4556 /* This may look odd, but it is a preparation for
4557 * feeding "there are unchanged files which should
4558 * not produce diffs, but when you are doing copy
4559 * detection you would need them, so here they are"
4560 * entries to the diff-core. They will be prefixed
4561 * with something like '=' or '*' (I haven't decided
4562 * which but should not make any difference).
4563 * Feeding the same new and old to diff_change()
4564 * also has the same effect.
4565 * Before the final output happens, they are pruned after
4566 * merged into rename/copy pairs as appropriate.
4567 */
4568 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4569 addremove = (addremove == '+' ? '-' :
4570 addremove == '-' ? '+' : addremove);
4571
4572 if (options->prefix &&
4573 strncmp(concatpath, options->prefix, options->prefix_length))
4574 return;
4575
4576 one = alloc_filespec(concatpath);
4577 two = alloc_filespec(concatpath);
4578
4579 if (addremove != '+')
4580 fill_filespec(one, sha1, mode);
4581 if (addremove != '-') {
4582 fill_filespec(two, sha1, mode);
4583 two->dirty_submodule = dirty_submodule;
4584 }
4585
4586 diff_queue(&diff_queued_diff, one, two);
4587 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4588 DIFF_OPT_SET(options, HAS_CHANGES);
4589 }
4590
4591 void diff_change(struct diff_options *options,
4592 unsigned old_mode, unsigned new_mode,
4593 const unsigned char *old_sha1,
4594 const unsigned char *new_sha1,
4595 const char *concatpath,
4596 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4597 {
4598 struct diff_filespec *one, *two;
4599
4600 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4601 is_submodule_ignored(concatpath, options))
4602 return;
4603
4604 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4605 unsigned tmp;
4606 const unsigned char *tmp_c;
4607 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4608 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4609 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4610 new_dirty_submodule = tmp;
4611 }
4612
4613 if (options->prefix &&
4614 strncmp(concatpath, options->prefix, options->prefix_length))
4615 return;
4616
4617 one = alloc_filespec(concatpath);
4618 two = alloc_filespec(concatpath);
4619 fill_filespec(one, old_sha1, old_mode);
4620 fill_filespec(two, new_sha1, new_mode);
4621 one->dirty_submodule = old_dirty_submodule;
4622 two->dirty_submodule = new_dirty_submodule;
4623
4624 diff_queue(&diff_queued_diff, one, two);
4625 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4626 DIFF_OPT_SET(options, HAS_CHANGES);
4627 }
4628
4629 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4630 {
4631 struct diff_filepair *pair;
4632 struct diff_filespec *one, *two;
4633
4634 if (options->prefix &&
4635 strncmp(path, options->prefix, options->prefix_length))
4636 return NULL;
4637
4638 one = alloc_filespec(path);
4639 two = alloc_filespec(path);
4640 pair = diff_queue(&diff_queued_diff, one, two);
4641 pair->is_unmerged = 1;
4642 return pair;
4643 }
4644
4645 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4646 size_t *outsize)
4647 {
4648 struct diff_tempfile *temp;
4649 const char *argv[3];
4650 const char **arg = argv;
4651 struct child_process child;
4652 struct strbuf buf = STRBUF_INIT;
4653 int err = 0;
4654
4655 temp = prepare_temp_file(spec->path, spec);
4656 *arg++ = pgm;
4657 *arg++ = temp->name;
4658 *arg = NULL;
4659
4660 memset(&child, 0, sizeof(child));
4661 child.use_shell = 1;
4662 child.argv = argv;
4663 child.out = -1;
4664 if (start_command(&child)) {
4665 remove_tempfile();
4666 return NULL;
4667 }
4668
4669 if (strbuf_read(&buf, child.out, 0) < 0)
4670 err = error("error reading from textconv command '%s'", pgm);
4671 close(child.out);
4672
4673 if (finish_command(&child) || err) {
4674 strbuf_release(&buf);
4675 remove_tempfile();
4676 return NULL;
4677 }
4678 remove_tempfile();
4679
4680 return strbuf_detach(&buf, outsize);
4681 }
4682
4683 size_t fill_textconv(struct userdiff_driver *driver,
4684 struct diff_filespec *df,
4685 char **outbuf)
4686 {
4687 size_t size;
4688
4689 if (!driver || !driver->textconv) {
4690 if (!DIFF_FILE_VALID(df)) {
4691 *outbuf = "";
4692 return 0;
4693 }
4694 if (diff_populate_filespec(df, 0))
4695 die("unable to read files to diff");
4696 *outbuf = df->data;
4697 return df->size;
4698 }
4699
4700 if (driver->textconv_cache && df->sha1_valid) {
4701 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4702 &size);
4703 if (*outbuf)
4704 return size;
4705 }
4706
4707 *outbuf = run_textconv(driver->textconv, df, &size);
4708 if (!*outbuf)
4709 die("unable to read files to diff");
4710
4711 if (driver->textconv_cache && df->sha1_valid) {
4712 /* ignore errors, as we might be in a readonly repository */
4713 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4714 size);
4715 /*
4716 * we could save up changes and flush them all at the end,
4717 * but we would need an extra call after all diffing is done.
4718 * Since generating a cache entry is the slow path anyway,
4719 * this extra overhead probably isn't a big deal.
4720 */
4721 notes_cache_write(driver->textconv_cache);
4722 }
4723
4724 return size;
4725 }
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