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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"
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
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;
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 };
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 }
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;
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 }
114 p += p_len;
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
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 }
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);
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
170 return git_diff_basic_config(var, value, cb);
171 }
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 }
180 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
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 }
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 }
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 }
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
218 return git_default_config(var, value, cb);
219 }
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;
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 }
239 static const char *external_diff(void)
240 {
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
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 }
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];
260 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
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 };
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 }
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;
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313 }
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 }
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;
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 }
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;
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367 }
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;
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 }
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 }
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 }
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 }
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 }
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);
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 }
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;
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 @@ */
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));
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
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 }
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 }
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504 }
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 }
514 static int remove_tempfile_installed;
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 }
526 static void remove_tempfile_on_signal(int signo)
527 {
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531 }
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 }
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);
556 while (0 < size) {
557 int len;
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 }
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;
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
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 }
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" : "";
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);
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
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;
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 }
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 };
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 }
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 };
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 };
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 };
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 };
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;
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 }
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 }
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 = "";
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
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;
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;
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 }
852 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854 }
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 }
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
883 return 0;
884 }
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;
897 out->size = 0;
898 out->ptr = NULL;
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;
905 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
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++;
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;
922 i = j - 1;
923 }
924 }
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;
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
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 }
955 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
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 }
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 }
990 static void diff_filespec_load_driver(struct diff_filespec *one)
991 {
992 /* Use already-loaded driver */
993 if (one->driver)
994 return;
996 if (S_ISREG(one->mode))
997 one->driver = userdiff_find_by_path(one->path);
999 /* Fallback to default settings */
1000 if (!one->driver)
1001 one->driver = userdiff_find_by_name("default");
1002 }
1004 static const char *userdiff_word_regex(struct diff_filespec *one)
1005 {
1006 diff_filespec_load_driver(one);
1007 return one->driver->word_regex;
1008 }
1010 static void init_diff_words_data(struct emit_callback *ecbdata,
1011 struct diff_options *o,
1012 struct diff_filespec *one,
1013 struct diff_filespec *two)
1014 {
1015 int i;
1017 ecbdata->diff_words =
1018 xcalloc(1, sizeof(struct diff_words_data));
1019 ecbdata->diff_words->type = o->word_diff;
1020 ecbdata->diff_words->opt = o;
1021 if (!o->word_regex)
1022 o->word_regex = userdiff_word_regex(one);
1023 if (!o->word_regex)
1024 o->word_regex = userdiff_word_regex(two);
1025 if (!o->word_regex)
1026 o->word_regex = diff_word_regex_cfg;
1027 if (o->word_regex) {
1028 ecbdata->diff_words->word_regex = (regex_t *)
1029 xmalloc(sizeof(regex_t));
1030 if (regcomp(ecbdata->diff_words->word_regex,
1031 o->word_regex,
1032 REG_EXTENDED | REG_NEWLINE))
1033 die ("Invalid regular expression: %s",
1034 o->word_regex);
1035 }
1036 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
1037 if (o->word_diff == diff_words_styles[i].type) {
1038 ecbdata->diff_words->style =
1039 &diff_words_styles[i];
1040 break;
1041 }
1042 }
1043 if (want_color(o->use_color)) {
1044 struct diff_words_style *st = ecbdata->diff_words->style;
1045 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
1046 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
1047 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
1048 }
1049 }
1051 static void free_diff_words_data(struct emit_callback *ecbdata)
1052 {
1053 if (ecbdata->diff_words) {
1054 diff_words_flush(ecbdata);
1055 free (ecbdata->diff_words->minus.text.ptr);
1056 free (ecbdata->diff_words->minus.orig);
1057 free (ecbdata->diff_words->plus.text.ptr);
1058 free (ecbdata->diff_words->plus.orig);
1059 if (ecbdata->diff_words->word_regex) {
1060 regfree(ecbdata->diff_words->word_regex);
1061 free(ecbdata->diff_words->word_regex);
1062 }
1063 free(ecbdata->diff_words);
1064 ecbdata->diff_words = NULL;
1065 }
1066 }
1068 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1069 {
1070 if (want_color(diff_use_color))
1071 return diff_colors[ix];
1072 return "";
1073 }
1075 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1076 {
1077 const char *cp;
1078 unsigned long allot;
1079 size_t l = len;
1081 if (ecb->truncate)
1082 return ecb->truncate(line, len);
1083 cp = line;
1084 allot = l;
1085 while (0 < l) {
1086 (void) utf8_width(&cp, &l);
1087 if (!cp)
1088 break; /* truncated in the middle? */
1089 }
1090 return allot - l;
1091 }
1093 static void find_lno(const char *line, struct emit_callback *ecbdata)
1094 {
1095 const char *p;
1096 ecbdata->lno_in_preimage = 0;
1097 ecbdata->lno_in_postimage = 0;
1098 p = strchr(line, '-');
1099 if (!p)
1100 return; /* cannot happen */
1101 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1102 p = strchr(p, '+');
1103 if (!p)
1104 return; /* cannot happen */
1105 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1106 }
1108 static void fn_out_consume(void *priv, char *line, unsigned long len)
1109 {
1110 struct emit_callback *ecbdata = priv;
1111 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1112 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1113 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1114 struct diff_options *o = ecbdata->opt;
1115 char *line_prefix = "";
1116 struct strbuf *msgbuf;
1118 if (o && o->output_prefix) {
1119 msgbuf = o->output_prefix(o, o->output_prefix_data);
1120 line_prefix = msgbuf->buf;
1121 }
1123 if (ecbdata->header) {
1124 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1125 strbuf_reset(ecbdata->header);
1126 ecbdata->header = NULL;
1127 }
1128 *(ecbdata->found_changesp) = 1;
1130 if (ecbdata->label_path[0]) {
1131 const char *name_a_tab, *name_b_tab;
1133 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1134 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1136 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1137 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1138 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1139 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1140 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1141 }
1143 if (diff_suppress_blank_empty
1144 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1145 line[0] = '\n';
1146 len = 1;
1147 }
1149 if (line[0] == '@') {
1150 if (ecbdata->diff_words)
1151 diff_words_flush(ecbdata);
1152 len = sane_truncate_line(ecbdata, line, len);
1153 find_lno(line, ecbdata);
1154 emit_hunk_header(ecbdata, line, len);
1155 if (line[len-1] != '\n')
1156 putc('\n', ecbdata->opt->file);
1157 return;
1158 }
1160 if (len < 1) {
1161 emit_line(ecbdata->opt, reset, reset, line, len);
1162 if (ecbdata->diff_words
1163 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1164 fputs("~\n", ecbdata->opt->file);
1165 return;
1166 }
1168 if (ecbdata->diff_words) {
1169 if (line[0] == '-') {
1170 diff_words_append(line, len,
1171 &ecbdata->diff_words->minus);
1172 return;
1173 } else if (line[0] == '+') {
1174 diff_words_append(line, len,
1175 &ecbdata->diff_words->plus);
1176 return;
1177 } else if (!prefixcmp(line, "\\ ")) {
1178 /*
1179 * Eat the "no newline at eof" marker as if we
1180 * saw a "+" or "-" line with nothing on it,
1181 * and return without diff_words_flush() to
1182 * defer processing. If this is the end of
1183 * preimage, more "+" lines may come after it.
1184 */
1185 return;
1186 }
1187 diff_words_flush(ecbdata);
1188 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1189 emit_line(ecbdata->opt, plain, reset, line, len);
1190 fputs("~\n", ecbdata->opt->file);
1191 } else {
1192 /*
1193 * Skip the prefix character, if any. With
1194 * diff_suppress_blank_empty, there may be
1195 * none.
1196 */
1197 if (line[0] != '\n') {
1198 line++;
1199 len--;
1200 }
1201 emit_line(ecbdata->opt, plain, reset, line, len);
1202 }
1203 return;
1204 }
1206 if (line[0] != '+') {
1207 const char *color =
1208 diff_get_color(ecbdata->color_diff,
1209 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1210 ecbdata->lno_in_preimage++;
1211 if (line[0] == ' ')
1212 ecbdata->lno_in_postimage++;
1213 emit_line(ecbdata->opt, color, reset, line, len);
1214 } else {
1215 ecbdata->lno_in_postimage++;
1216 emit_add_line(reset, ecbdata, line + 1, len - 1);
1217 }
1218 }
1220 static char *pprint_rename(const char *a, const char *b)
1221 {
1222 const char *old = a;
1223 const char *new = b;
1224 struct strbuf name = STRBUF_INIT;
1225 int pfx_length, sfx_length;
1226 int len_a = strlen(a);
1227 int len_b = strlen(b);
1228 int a_midlen, b_midlen;
1229 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1230 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1232 if (qlen_a || qlen_b) {
1233 quote_c_style(a, &name, NULL, 0);
1234 strbuf_addstr(&name, " => ");
1235 quote_c_style(b, &name, NULL, 0);
1236 return strbuf_detach(&name, NULL);
1237 }
1239 /* Find common prefix */
1240 pfx_length = 0;
1241 while (*old && *new && *old == *new) {
1242 if (*old == '/')
1243 pfx_length = old - a + 1;
1244 old++;
1245 new++;
1246 }
1248 /* Find common suffix */
1249 old = a + len_a;
1250 new = b + len_b;
1251 sfx_length = 0;
1252 while (a <= old && b <= new && *old == *new) {
1253 if (*old == '/')
1254 sfx_length = len_a - (old - a);
1255 old--;
1256 new--;
1257 }
1259 /*
1260 * pfx{mid-a => mid-b}sfx
1261 * {pfx-a => pfx-b}sfx
1262 * pfx{sfx-a => sfx-b}
1263 * name-a => name-b
1264 */
1265 a_midlen = len_a - pfx_length - sfx_length;
1266 b_midlen = len_b - pfx_length - sfx_length;
1267 if (a_midlen < 0)
1268 a_midlen = 0;
1269 if (b_midlen < 0)
1270 b_midlen = 0;
1272 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1273 if (pfx_length + sfx_length) {
1274 strbuf_add(&name, a, pfx_length);
1275 strbuf_addch(&name, '{');
1276 }
1277 strbuf_add(&name, a + pfx_length, a_midlen);
1278 strbuf_addstr(&name, " => ");
1279 strbuf_add(&name, b + pfx_length, b_midlen);
1280 if (pfx_length + sfx_length) {
1281 strbuf_addch(&name, '}');
1282 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1283 }
1284 return strbuf_detach(&name, NULL);
1285 }
1287 struct diffstat_t {
1288 int nr;
1289 int alloc;
1290 struct diffstat_file {
1291 char *from_name;
1292 char *name;
1293 char *print_name;
1294 unsigned is_unmerged:1;
1295 unsigned is_binary:1;
1296 unsigned is_renamed:1;
1297 uintmax_t added, deleted;
1298 } **files;
1299 };
1301 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1302 const char *name_a,
1303 const char *name_b)
1304 {
1305 struct diffstat_file *x;
1306 x = xcalloc(sizeof (*x), 1);
1307 if (diffstat->nr == diffstat->alloc) {
1308 diffstat->alloc = alloc_nr(diffstat->alloc);
1309 diffstat->files = xrealloc(diffstat->files,
1310 diffstat->alloc * sizeof(x));
1311 }
1312 diffstat->files[diffstat->nr++] = x;
1313 if (name_b) {
1314 x->from_name = xstrdup(name_a);
1315 x->name = xstrdup(name_b);
1316 x->is_renamed = 1;
1317 }
1318 else {
1319 x->from_name = NULL;
1320 x->name = xstrdup(name_a);
1321 }
1322 return x;
1323 }
1325 static void diffstat_consume(void *priv, char *line, unsigned long len)
1326 {
1327 struct diffstat_t *diffstat = priv;
1328 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1330 if (line[0] == '+')
1331 x->added++;
1332 else if (line[0] == '-')
1333 x->deleted++;
1334 }
1336 const char mime_boundary_leader[] = "------------";
1338 static int scale_linear(int it, int width, int max_change)
1339 {
1340 if (!it)
1341 return 0;
1342 /*
1343 * make sure that at least one '-' or '+' is printed if
1344 * there is any change to this path. The easiest way is to
1345 * scale linearly as if the alloted width is one column shorter
1346 * than it is, and then add 1 to the result.
1347 */
1348 return 1 + (it * (width - 1) / max_change);
1349 }
1351 static void show_name(FILE *file,
1352 const char *prefix, const char *name, int len)
1353 {
1354 fprintf(file, " %s%-*s |", prefix, len, name);
1355 }
1357 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1358 {
1359 if (cnt <= 0)
1360 return;
1361 fprintf(file, "%s", set);
1362 while (cnt--)
1363 putc(ch, file);
1364 fprintf(file, "%s", reset);
1365 }
1367 static void fill_print_name(struct diffstat_file *file)
1368 {
1369 char *pname;
1371 if (file->print_name)
1372 return;
1374 if (!file->is_renamed) {
1375 struct strbuf buf = STRBUF_INIT;
1376 if (quote_c_style(file->name, &buf, NULL, 0)) {
1377 pname = strbuf_detach(&buf, NULL);
1378 } else {
1379 pname = file->name;
1380 strbuf_release(&buf);
1381 }
1382 } else {
1383 pname = pprint_rename(file->from_name, file->name);
1384 }
1385 file->print_name = pname;
1386 }
1388 int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
1389 {
1390 struct strbuf sb = STRBUF_INIT;
1391 int ret;
1393 if (!files) {
1394 assert(insertions == 0 && deletions == 0);
1395 return fputs(_(" 0 files changed\n"), fp);
1396 }
1398 strbuf_addf(&sb,
1399 Q_(" %d file changed", " %d files changed", files),
1400 files);
1402 /*
1403 * For binary diff, the caller may want to print "x files
1404 * changed" with insertions == 0 && deletions == 0.
1405 *
1406 * Not omitting "0 insertions(+), 0 deletions(-)" in this case
1407 * is probably less confusing (i.e skip over "2 files changed
1408 * but nothing about added/removed lines? Is this a bug in Git?").
1409 */
1410 if (insertions || deletions == 0) {
1411 /*
1412 * TRANSLATORS: "+" in (+) is a line addition marker;
1413 * do not translate it.
1414 */
1415 strbuf_addf(&sb,
1416 Q_(", %d insertion(+)", ", %d insertions(+)",
1417 insertions),
1418 insertions);
1419 }
1421 if (deletions || insertions == 0) {
1422 /*
1423 * TRANSLATORS: "-" in (-) is a line removal marker;
1424 * do not translate it.
1425 */
1426 strbuf_addf(&sb,
1427 Q_(", %d deletion(-)", ", %d deletions(-)",
1428 deletions),
1429 deletions);
1430 }
1431 strbuf_addch(&sb, '\n');
1432 ret = fputs(sb.buf, fp);
1433 strbuf_release(&sb);
1434 return ret;
1435 }
1437 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1438 {
1439 int i, len, add, del, adds = 0, dels = 0;
1440 uintmax_t max_change = 0, max_len = 0;
1441 int total_files = data->nr;
1442 int width, name_width, count;
1443 const char *reset, *add_c, *del_c;
1444 const char *line_prefix = "";
1445 int extra_shown = 0;
1446 struct strbuf *msg = NULL;
1448 if (data->nr == 0)
1449 return;
1451 if (options->output_prefix) {
1452 msg = options->output_prefix(options, options->output_prefix_data);
1453 line_prefix = msg->buf;
1454 }
1456 width = options->stat_width ? options->stat_width : 80;
1457 name_width = options->stat_name_width ? options->stat_name_width : 50;
1458 count = options->stat_count ? options->stat_count : data->nr;
1460 /* Sanity: give at least 5 columns to the graph,
1461 * but leave at least 10 columns for the name.
1462 */
1463 if (width < 25)
1464 width = 25;
1465 if (name_width < 10)
1466 name_width = 10;
1467 else if (width < name_width + 15)
1468 name_width = width - 15;
1470 /* Find the longest filename and max number of changes */
1471 reset = diff_get_color_opt(options, DIFF_RESET);
1472 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1473 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1475 for (i = 0; (i < count) && (i < data->nr); i++) {
1476 struct diffstat_file *file = data->files[i];
1477 uintmax_t change = file->added + file->deleted;
1478 if (!data->files[i]->is_renamed &&
1479 (change == 0)) {
1480 count++; /* not shown == room for one more */
1481 continue;
1482 }
1483 fill_print_name(file);
1484 len = strlen(file->print_name);
1485 if (max_len < len)
1486 max_len = len;
1488 if (file->is_binary || file->is_unmerged)
1489 continue;
1490 if (max_change < change)
1491 max_change = change;
1492 }
1493 count = i; /* min(count, data->nr) */
1495 /* Compute the width of the graph part;
1496 * 10 is for one blank at the beginning of the line plus
1497 * " | count " between the name and the graph.
1498 *
1499 * From here on, name_width is the width of the name area,
1500 * and width is the width of the graph area.
1501 */
1502 name_width = (name_width < max_len) ? name_width : max_len;
1503 if (width < (name_width + 10) + max_change)
1504 width = width - (name_width + 10);
1505 else
1506 width = max_change;
1508 for (i = 0; i < count; i++) {
1509 const char *prefix = "";
1510 char *name = data->files[i]->print_name;
1511 uintmax_t added = data->files[i]->added;
1512 uintmax_t deleted = data->files[i]->deleted;
1513 int name_len;
1515 if (!data->files[i]->is_renamed &&
1516 (added + deleted == 0)) {
1517 total_files--;
1518 continue;
1519 }
1520 /*
1521 * "scale" the filename
1522 */
1523 len = name_width;
1524 name_len = strlen(name);
1525 if (name_width < name_len) {
1526 char *slash;
1527 prefix = "...";
1528 len -= 3;
1529 name += name_len - len;
1530 slash = strchr(name, '/');
1531 if (slash)
1532 name = slash;
1533 }
1535 if (data->files[i]->is_binary) {
1536 fprintf(options->file, "%s", line_prefix);
1537 show_name(options->file, prefix, name, len);
1538 fprintf(options->file, " Bin ");
1539 fprintf(options->file, "%s%"PRIuMAX"%s",
1540 del_c, deleted, reset);
1541 fprintf(options->file, " -> ");
1542 fprintf(options->file, "%s%"PRIuMAX"%s",
1543 add_c, added, reset);
1544 fprintf(options->file, " bytes");
1545 fprintf(options->file, "\n");
1546 continue;
1547 }
1548 else if (data->files[i]->is_unmerged) {
1549 fprintf(options->file, "%s", line_prefix);
1550 show_name(options->file, prefix, name, len);
1551 fprintf(options->file, " Unmerged\n");
1552 continue;
1553 }
1555 /*
1556 * scale the add/delete
1557 */
1558 add = added;
1559 del = deleted;
1560 adds += add;
1561 dels += del;
1563 if (width <= max_change) {
1564 int total = add + del;
1566 total = scale_linear(add + del, width, max_change);
1567 if (total < 2 && add && del)
1568 /* width >= 2 due to the sanity check */
1569 total = 2;
1570 if (add < del) {
1571 add = scale_linear(add, width, max_change);
1572 del = total - add;
1573 } else {
1574 del = scale_linear(del, width, max_change);
1575 add = total - del;
1576 }
1577 }
1578 fprintf(options->file, "%s", line_prefix);
1579 show_name(options->file, prefix, name, len);
1580 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1581 added + deleted ? " " : "");
1582 show_graph(options->file, '+', add, add_c, reset);
1583 show_graph(options->file, '-', del, del_c, reset);
1584 fprintf(options->file, "\n");
1585 }
1586 for (i = count; i < data->nr; i++) {
1587 uintmax_t added = data->files[i]->added;
1588 uintmax_t deleted = data->files[i]->deleted;
1589 if (!data->files[i]->is_renamed &&
1590 (added + deleted == 0)) {
1591 total_files--;
1592 continue;
1593 }
1594 adds += added;
1595 dels += deleted;
1596 if (!extra_shown)
1597 fprintf(options->file, "%s ...\n", line_prefix);
1598 extra_shown = 1;
1599 }
1600 fprintf(options->file, "%s", line_prefix);
1601 print_stat_summary(options->file, total_files, adds, dels);
1602 }
1604 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1605 {
1606 int i, adds = 0, dels = 0, total_files = data->nr;
1608 if (data->nr == 0)
1609 return;
1611 for (i = 0; i < data->nr; i++) {
1612 if (!data->files[i]->is_binary &&
1613 !data->files[i]->is_unmerged) {
1614 int added = data->files[i]->added;
1615 int deleted= data->files[i]->deleted;
1616 if (!data->files[i]->is_renamed &&
1617 (added + deleted == 0)) {
1618 total_files--;
1619 } else {
1620 adds += added;
1621 dels += deleted;
1622 }
1623 }
1624 }
1625 if (options->output_prefix) {
1626 struct strbuf *msg = NULL;
1627 msg = options->output_prefix(options,
1628 options->output_prefix_data);
1629 fprintf(options->file, "%s", msg->buf);
1630 }
1631 print_stat_summary(options->file, total_files, adds, dels);
1632 }
1634 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1635 {
1636 int i;
1638 if (data->nr == 0)
1639 return;
1641 for (i = 0; i < data->nr; i++) {
1642 struct diffstat_file *file = data->files[i];
1644 if (options->output_prefix) {
1645 struct strbuf *msg = NULL;
1646 msg = options->output_prefix(options,
1647 options->output_prefix_data);
1648 fprintf(options->file, "%s", msg->buf);
1649 }
1651 if (file->is_binary)
1652 fprintf(options->file, "-\t-\t");
1653 else
1654 fprintf(options->file,
1655 "%"PRIuMAX"\t%"PRIuMAX"\t",
1656 file->added, file->deleted);
1657 if (options->line_termination) {
1658 fill_print_name(file);
1659 if (!file->is_renamed)
1660 write_name_quoted(file->name, options->file,
1661 options->line_termination);
1662 else {
1663 fputs(file->print_name, options->file);
1664 putc(options->line_termination, options->file);
1665 }
1666 } else {
1667 if (file->is_renamed) {
1668 putc('\0', options->file);
1669 write_name_quoted(file->from_name, options->file, '\0');
1670 }
1671 write_name_quoted(file->name, options->file, '\0');
1672 }
1673 }
1674 }
1676 struct dirstat_file {
1677 const char *name;
1678 unsigned long changed;
1679 };
1681 struct dirstat_dir {
1682 struct dirstat_file *files;
1683 int alloc, nr, permille, cumulative;
1684 };
1686 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1687 unsigned long changed, const char *base, int baselen)
1688 {
1689 unsigned long this_dir = 0;
1690 unsigned int sources = 0;
1691 const char *line_prefix = "";
1692 struct strbuf *msg = NULL;
1694 if (opt->output_prefix) {
1695 msg = opt->output_prefix(opt, opt->output_prefix_data);
1696 line_prefix = msg->buf;
1697 }
1699 while (dir->nr) {
1700 struct dirstat_file *f = dir->files;
1701 int namelen = strlen(f->name);
1702 unsigned long this;
1703 char *slash;
1705 if (namelen < baselen)
1706 break;
1707 if (memcmp(f->name, base, baselen))
1708 break;
1709 slash = strchr(f->name + baselen, '/');
1710 if (slash) {
1711 int newbaselen = slash + 1 - f->name;
1712 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1713 sources++;
1714 } else {
1715 this = f->changed;
1716 dir->files++;
1717 dir->nr--;
1718 sources += 2;
1719 }
1720 this_dir += this;
1721 }
1723 /*
1724 * We don't report dirstat's for
1725 * - the top level
1726 * - or cases where everything came from a single directory
1727 * under this directory (sources == 1).
1728 */
1729 if (baselen && sources != 1) {
1730 if (this_dir) {
1731 int permille = this_dir * 1000 / changed;
1732 if (permille >= dir->permille) {
1733 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1734 permille / 10, permille % 10, baselen, base);
1735 if (!dir->cumulative)
1736 return 0;
1737 }
1738 }
1739 }
1740 return this_dir;
1741 }
1743 static int dirstat_compare(const void *_a, const void *_b)
1744 {
1745 const struct dirstat_file *a = _a;
1746 const struct dirstat_file *b = _b;
1747 return strcmp(a->name, b->name);
1748 }
1750 static void show_dirstat(struct diff_options *options)
1751 {
1752 int i;
1753 unsigned long changed;
1754 struct dirstat_dir dir;
1755 struct diff_queue_struct *q = &diff_queued_diff;
1757 dir.files = NULL;
1758 dir.alloc = 0;
1759 dir.nr = 0;
1760 dir.permille = options->dirstat_permille;
1761 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1763 changed = 0;
1764 for (i = 0; i < q->nr; i++) {
1765 struct diff_filepair *p = q->queue[i];
1766 const char *name;
1767 unsigned long copied, added, damage;
1768 int content_changed;
1770 name = p->two->path ? p->two->path : p->one->path;
1772 if (p->one->sha1_valid && p->two->sha1_valid)
1773 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1774 else
1775 content_changed = 1;
1777 if (!content_changed) {
1778 /*
1779 * The SHA1 has not changed, so pre-/post-content is
1780 * identical. We can therefore skip looking at the
1781 * file contents altogether.
1782 */
1783 damage = 0;
1784 goto found_damage;
1785 }
1787 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1788 /*
1789 * In --dirstat-by-file mode, we don't really need to
1790 * look at the actual file contents at all.
1791 * The fact that the SHA1 changed is enough for us to
1792 * add this file to the list of results
1793 * (with each file contributing equal damage).
1794 */
1795 damage = 1;
1796 goto found_damage;
1797 }
1799 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1800 diff_populate_filespec(p->one, 0);
1801 diff_populate_filespec(p->two, 0);
1802 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1803 &copied, &added);
1804 diff_free_filespec_data(p->one);
1805 diff_free_filespec_data(p->two);
1806 } else if (DIFF_FILE_VALID(p->one)) {
1807 diff_populate_filespec(p->one, 1);
1808 copied = added = 0;
1809 diff_free_filespec_data(p->one);
1810 } else if (DIFF_FILE_VALID(p->two)) {
1811 diff_populate_filespec(p->two, 1);
1812 copied = 0;
1813 added = p->two->size;
1814 diff_free_filespec_data(p->two);
1815 } else
1816 continue;
1818 /*
1819 * Original minus copied is the removed material,
1820 * added is the new material. They are both damages
1821 * made to the preimage.
1822 * If the resulting damage is zero, we know that
1823 * diffcore_count_changes() considers the two entries to
1824 * be identical, but since content_changed is true, we
1825 * know that there must have been _some_ kind of change,
1826 * so we force all entries to have damage > 0.
1827 */
1828 damage = (p->one->size - copied) + added;
1829 if (!damage)
1830 damage = 1;
1832 found_damage:
1833 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1834 dir.files[dir.nr].name = name;
1835 dir.files[dir.nr].changed = damage;
1836 changed += damage;
1837 dir.nr++;
1838 }
1840 /* This can happen even with many files, if everything was renames */
1841 if (!changed)
1842 return;
1844 /* Show all directories with more than x% of the changes */
1845 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1846 gather_dirstat(options, &dir, changed, "", 0);
1847 }
1849 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1850 {
1851 int i;
1852 unsigned long changed;
1853 struct dirstat_dir dir;
1855 if (data->nr == 0)
1856 return;
1858 dir.files = NULL;
1859 dir.alloc = 0;
1860 dir.nr = 0;
1861 dir.permille = options->dirstat_permille;
1862 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1864 changed = 0;
1865 for (i = 0; i < data->nr; i++) {
1866 struct diffstat_file *file = data->files[i];
1867 unsigned long damage = file->added + file->deleted;
1868 if (file->is_binary)
1869 /*
1870 * binary files counts bytes, not lines. Must find some
1871 * way to normalize binary bytes vs. textual lines.
1872 * The following heuristic assumes that there are 64
1873 * bytes per "line".
1874 * This is stupid and ugly, but very cheap...
1875 */
1876 damage = (damage + 63) / 64;
1877 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1878 dir.files[dir.nr].name = file->name;
1879 dir.files[dir.nr].changed = damage;
1880 changed += damage;
1881 dir.nr++;
1882 }
1884 /* This can happen even with many files, if everything was renames */
1885 if (!changed)
1886 return;
1888 /* Show all directories with more than x% of the changes */
1889 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1890 gather_dirstat(options, &dir, changed, "", 0);
1891 }
1893 static void free_diffstat_info(struct diffstat_t *diffstat)
1894 {
1895 int i;
1896 for (i = 0; i < diffstat->nr; i++) {
1897 struct diffstat_file *f = diffstat->files[i];
1898 if (f->name != f->print_name)
1899 free(f->print_name);
1900 free(f->name);
1901 free(f->from_name);
1902 free(f);
1903 }
1904 free(diffstat->files);
1905 }
1907 struct checkdiff_t {
1908 const char *filename;
1909 int lineno;
1910 int conflict_marker_size;
1911 struct diff_options *o;
1912 unsigned ws_rule;
1913 unsigned status;
1914 };
1916 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1917 {
1918 char firstchar;
1919 int cnt;
1921 if (len < marker_size + 1)
1922 return 0;
1923 firstchar = line[0];
1924 switch (firstchar) {
1925 case '=': case '>': case '<': case '|':
1926 break;
1927 default:
1928 return 0;
1929 }
1930 for (cnt = 1; cnt < marker_size; cnt++)
1931 if (line[cnt] != firstchar)
1932 return 0;
1933 /* line[1] thru line[marker_size-1] are same as firstchar */
1934 if (len < marker_size + 1 || !isspace(line[marker_size]))
1935 return 0;
1936 return 1;
1937 }
1939 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1940 {
1941 struct checkdiff_t *data = priv;
1942 int marker_size = data->conflict_marker_size;
1943 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1944 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1945 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1946 char *err;
1947 char *line_prefix = "";
1948 struct strbuf *msgbuf;
1950 assert(data->o);
1951 if (data->o->output_prefix) {
1952 msgbuf = data->o->output_prefix(data->o,
1953 data->o->output_prefix_data);
1954 line_prefix = msgbuf->buf;
1955 }
1957 if (line[0] == '+') {
1958 unsigned bad;
1959 data->lineno++;
1960 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1961 data->status |= 1;
1962 fprintf(data->o->file,
1963 "%s%s:%d: leftover conflict marker\n",
1964 line_prefix, data->filename, data->lineno);
1965 }
1966 bad = ws_check(line + 1, len - 1, data->ws_rule);
1967 if (!bad)
1968 return;
1969 data->status |= bad;
1970 err = whitespace_error_string(bad);
1971 fprintf(data->o->file, "%s%s:%d: %s.\n",
1972 line_prefix, data->filename, data->lineno, err);
1973 free(err);
1974 emit_line(data->o, set, reset, line, 1);
1975 ws_check_emit(line + 1, len - 1, data->ws_rule,
1976 data->o->file, set, reset, ws);
1977 } else if (line[0] == ' ') {
1978 data->lineno++;
1979 } else if (line[0] == '@') {
1980 char *plus = strchr(line, '+');
1981 if (plus)
1982 data->lineno = strtol(plus, NULL, 10) - 1;
1983 else
1984 die("invalid diff");
1985 }
1986 }
1988 static unsigned char *deflate_it(char *data,
1989 unsigned long size,
1990 unsigned long *result_size)
1991 {
1992 int bound;
1993 unsigned char *deflated;
1994 git_zstream stream;
1996 memset(&stream, 0, sizeof(stream));
1997 git_deflate_init(&stream, zlib_compression_level);
1998 bound = git_deflate_bound(&stream, size);
1999 deflated = xmalloc(bound);
2000 stream.next_out = deflated;
2001 stream.avail_out = bound;
2003 stream.next_in = (unsigned char *)data;
2004 stream.avail_in = size;
2005 while (git_deflate(&stream, Z_FINISH) == Z_OK)
2006 ; /* nothing */
2007 git_deflate_end(&stream);
2008 *result_size = stream.total_out;
2009 return deflated;
2010 }
2012 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2013 {
2014 void *cp;
2015 void *delta;
2016 void *deflated;
2017 void *data;
2018 unsigned long orig_size;
2019 unsigned long delta_size;
2020 unsigned long deflate_size;
2021 unsigned long data_size;
2023 /* We could do deflated delta, or we could do just deflated two,
2024 * whichever is smaller.
2025 */
2026 delta = NULL;
2027 deflated = deflate_it(two->ptr, two->size, &deflate_size);
2028 if (one->size && two->size) {
2029 delta = diff_delta(one->ptr, one->size,
2030 two->ptr, two->size,
2031 &delta_size, deflate_size);
2032 if (delta) {
2033 void *to_free = delta;
2034 orig_size = delta_size;
2035 delta = deflate_it(delta, delta_size, &delta_size);
2036 free(to_free);
2037 }
2038 }
2040 if (delta && delta_size < deflate_size) {
2041 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
2042 free(deflated);
2043 data = delta;
2044 data_size = delta_size;
2045 }
2046 else {
2047 fprintf(file, "%sliteral %lu\n", prefix, two->size);
2048 free(delta);
2049 data = deflated;
2050 data_size = deflate_size;
2051 }
2053 /* emit data encoded in base85 */
2054 cp = data;
2055 while (data_size) {
2056 int bytes = (52 < data_size) ? 52 : data_size;
2057 char line[70];
2058 data_size -= bytes;
2059 if (bytes <= 26)
2060 line[0] = bytes + 'A' - 1;
2061 else
2062 line[0] = bytes - 26 + 'a' - 1;
2063 encode_85(line + 1, cp, bytes);
2064 cp = (char *) cp + bytes;
2065 fprintf(file, "%s", prefix);
2066 fputs(line, file);
2067 fputc('\n', file);
2068 }
2069 fprintf(file, "%s\n", prefix);
2070 free(data);
2071 }
2073 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2074 {
2075 fprintf(file, "%sGIT binary patch\n", prefix);
2076 emit_binary_diff_body(file, one, two, prefix);
2077 emit_binary_diff_body(file, two, one, prefix);
2078 }
2080 int diff_filespec_is_binary(struct diff_filespec *one)
2081 {
2082 if (one->is_binary == -1) {
2083 diff_filespec_load_driver(one);
2084 if (one->driver->binary != -1)
2085 one->is_binary = one->driver->binary;
2086 else {
2087 if (!one->data && DIFF_FILE_VALID(one))
2088 diff_populate_filespec(one, 0);
2089 if (one->data)
2090 one->is_binary = buffer_is_binary(one->data,
2091 one->size);
2092 if (one->is_binary == -1)
2093 one->is_binary = 0;
2094 }
2095 }
2096 return one->is_binary;
2097 }
2099 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2100 {
2101 diff_filespec_load_driver(one);
2102 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2103 }
2105 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2106 {
2107 if (!options->a_prefix)
2108 options->a_prefix = a;
2109 if (!options->b_prefix)
2110 options->b_prefix = b;
2111 }
2113 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2114 {
2115 if (!DIFF_FILE_VALID(one))
2116 return NULL;
2118 diff_filespec_load_driver(one);
2119 return userdiff_get_textconv(one->driver);
2120 }
2122 static void builtin_diff(const char *name_a,
2123 const char *name_b,
2124 struct diff_filespec *one,
2125 struct diff_filespec *two,
2126 const char *xfrm_msg,
2127 int must_show_header,
2128 struct diff_options *o,
2129 int complete_rewrite)
2130 {
2131 mmfile_t mf1, mf2;
2132 const char *lbl[2];
2133 char *a_one, *b_two;
2134 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2135 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2136 const char *a_prefix, *b_prefix;
2137 struct userdiff_driver *textconv_one = NULL;
2138 struct userdiff_driver *textconv_two = NULL;
2139 struct strbuf header = STRBUF_INIT;
2140 struct strbuf *msgbuf;
2141 char *line_prefix = "";
2143 if (o->output_prefix) {
2144 msgbuf = o->output_prefix(o, o->output_prefix_data);
2145 line_prefix = msgbuf->buf;
2146 }
2148 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2149 (!one->mode || S_ISGITLINK(one->mode)) &&
2150 (!two->mode || S_ISGITLINK(two->mode))) {
2151 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2152 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2153 show_submodule_summary(o->file, one ? one->path : two->path,
2154 one->sha1, two->sha1, two->dirty_submodule,
2155 del, add, reset);
2156 return;
2157 }
2159 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2160 textconv_one = get_textconv(one);
2161 textconv_two = get_textconv(two);
2162 }
2164 diff_set_mnemonic_prefix(o, "a/", "b/");
2165 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2166 a_prefix = o->b_prefix;
2167 b_prefix = o->a_prefix;
2168 } else {
2169 a_prefix = o->a_prefix;
2170 b_prefix = o->b_prefix;
2171 }
2173 /* Never use a non-valid filename anywhere if at all possible */
2174 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2175 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2177 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2178 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2179 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2180 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2181 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2182 if (lbl[0][0] == '/') {
2183 /* /dev/null */
2184 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2185 if (xfrm_msg)
2186 strbuf_addstr(&header, xfrm_msg);
2187 must_show_header = 1;
2188 }
2189 else if (lbl[1][0] == '/') {
2190 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2191 if (xfrm_msg)
2192 strbuf_addstr(&header, xfrm_msg);
2193 must_show_header = 1;
2194 }
2195 else {
2196 if (one->mode != two->mode) {
2197 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2198 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2199 must_show_header = 1;
2200 }
2201 if (xfrm_msg)
2202 strbuf_addstr(&header, xfrm_msg);
2204 /*
2205 * we do not run diff between different kind
2206 * of objects.
2207 */
2208 if ((one->mode ^ two->mode) & S_IFMT)
2209 goto free_ab_and_return;
2210 if (complete_rewrite &&
2211 (textconv_one || !diff_filespec_is_binary(one)) &&
2212 (textconv_two || !diff_filespec_is_binary(two))) {
2213 fprintf(o->file, "%s", header.buf);
2214 strbuf_reset(&header);
2215 emit_rewrite_diff(name_a, name_b, one, two,
2216 textconv_one, textconv_two, o);
2217 o->found_changes = 1;
2218 goto free_ab_and_return;
2219 }
2220 }
2222 if (o->irreversible_delete && lbl[1][0] == '/') {
2223 fprintf(o->file, "%s", header.buf);
2224 strbuf_reset(&header);
2225 goto free_ab_and_return;
2226 } else if (!DIFF_OPT_TST(o, TEXT) &&
2227 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2228 (!textconv_two && diff_filespec_is_binary(two)) )) {
2229 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2230 die("unable to read files to diff");
2231 /* Quite common confusing case */
2232 if (mf1.size == mf2.size &&
2233 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2234 if (must_show_header)
2235 fprintf(o->file, "%s", header.buf);
2236 goto free_ab_and_return;
2237 }
2238 fprintf(o->file, "%s", header.buf);
2239 strbuf_reset(&header);
2240 if (DIFF_OPT_TST(o, BINARY))
2241 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2242 else
2243 fprintf(o->file, "%sBinary files %s and %s differ\n",
2244 line_prefix, lbl[0], lbl[1]);
2245 o->found_changes = 1;
2246 } else {
2247 /* Crazy xdl interfaces.. */
2248 const char *diffopts = getenv("GIT_DIFF_OPTS");
2249 xpparam_t xpp;
2250 xdemitconf_t xecfg;
2251 struct emit_callback ecbdata;
2252 const struct userdiff_funcname *pe;
2254 if (must_show_header) {
2255 fprintf(o->file, "%s", header.buf);
2256 strbuf_reset(&header);
2257 }
2259 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2260 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2262 pe = diff_funcname_pattern(one);
2263 if (!pe)
2264 pe = diff_funcname_pattern(two);
2266 memset(&xpp, 0, sizeof(xpp));
2267 memset(&xecfg, 0, sizeof(xecfg));
2268 memset(&ecbdata, 0, sizeof(ecbdata));
2269 ecbdata.label_path = lbl;
2270 ecbdata.color_diff = want_color(o->use_color);
2271 ecbdata.found_changesp = &o->found_changes;
2272 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2273 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2274 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2275 ecbdata.opt = o;
2276 ecbdata.header = header.len ? &header : NULL;
2277 xpp.flags = o->xdl_opts;
2278 xecfg.ctxlen = o->context;
2279 xecfg.interhunkctxlen = o->interhunkcontext;
2280 xecfg.flags = XDL_EMIT_FUNCNAMES;
2281 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2282 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2283 if (pe)
2284 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2285 if (!diffopts)
2286 ;
2287 else if (!prefixcmp(diffopts, "--unified="))
2288 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2289 else if (!prefixcmp(diffopts, "-u"))
2290 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2291 if (o->word_diff)
2292 init_diff_words_data(&ecbdata, o, one, two);
2293 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2294 &xpp, &xecfg);
2295 if (o->word_diff)
2296 free_diff_words_data(&ecbdata);
2297 if (textconv_one)
2298 free(mf1.ptr);
2299 if (textconv_two)
2300 free(mf2.ptr);
2301 xdiff_clear_find_func(&xecfg);
2302 }
2304 free_ab_and_return:
2305 strbuf_release(&header);
2306 diff_free_filespec_data(one);
2307 diff_free_filespec_data(two);
2308 free(a_one);
2309 free(b_two);
2310 return;
2311 }
2313 static void builtin_diffstat(const char *name_a, const char *name_b,
2314 struct diff_filespec *one,
2315 struct diff_filespec *two,
2316 struct diffstat_t *diffstat,
2317 struct diff_options *o,
2318 int complete_rewrite)
2319 {
2320 mmfile_t mf1, mf2;
2321 struct diffstat_file *data;
2323 data = diffstat_add(diffstat, name_a, name_b);
2325 if (!one || !two) {
2326 data->is_unmerged = 1;
2327 return;
2328 }
2330 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2331 data->is_binary = 1;
2332 data->added = diff_filespec_size(two);
2333 data->deleted = diff_filespec_size(one);
2334 }
2336 else if (complete_rewrite) {
2337 diff_populate_filespec(one, 0);
2338 diff_populate_filespec(two, 0);
2339 data->deleted = count_lines(one->data, one->size);
2340 data->added = count_lines(two->data, two->size);
2341 }
2343 else {
2344 /* Crazy xdl interfaces.. */
2345 xpparam_t xpp;
2346 xdemitconf_t xecfg;
2348 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2349 die("unable to read files to diff");
2351 memset(&xpp, 0, sizeof(xpp));
2352 memset(&xecfg, 0, sizeof(xecfg));
2353 xpp.flags = o->xdl_opts;
2354 xecfg.ctxlen = o->context;
2355 xecfg.interhunkctxlen = o->interhunkcontext;
2356 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2357 &xpp, &xecfg);
2358 }
2360 diff_free_filespec_data(one);
2361 diff_free_filespec_data(two);
2362 }
2364 static void builtin_checkdiff(const char *name_a, const char *name_b,
2365 const char *attr_path,
2366 struct diff_filespec *one,
2367 struct diff_filespec *two,
2368 struct diff_options *o)
2369 {
2370 mmfile_t mf1, mf2;
2371 struct checkdiff_t data;
2373 if (!two)
2374 return;
2376 memset(&data, 0, sizeof(data));
2377 data.filename = name_b ? name_b : name_a;
2378 data.lineno = 0;
2379 data.o = o;
2380 data.ws_rule = whitespace_rule(attr_path);
2381 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2383 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2384 die("unable to read files to diff");
2386 /*
2387 * All the other codepaths check both sides, but not checking
2388 * the "old" side here is deliberate. We are checking the newly
2389 * introduced changes, and as long as the "new" side is text, we
2390 * can and should check what it introduces.
2391 */
2392 if (diff_filespec_is_binary(two))
2393 goto free_and_return;
2394 else {
2395 /* Crazy xdl interfaces.. */
2396 xpparam_t xpp;
2397 xdemitconf_t xecfg;
2399 memset(&xpp, 0, sizeof(xpp));
2400 memset(&xecfg, 0, sizeof(xecfg));
2401 xecfg.ctxlen = 1; /* at least one context line */
2402 xpp.flags = 0;
2403 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2404 &xpp, &xecfg);
2406 if (data.ws_rule & WS_BLANK_AT_EOF) {
2407 struct emit_callback ecbdata;
2408 int blank_at_eof;
2410 ecbdata.ws_rule = data.ws_rule;
2411 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2412 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2414 if (blank_at_eof) {
2415 static char *err;
2416 if (!err)
2417 err = whitespace_error_string(WS_BLANK_AT_EOF);
2418 fprintf(o->file, "%s:%d: %s.\n",
2419 data.filename, blank_at_eof, err);
2420 data.status = 1; /* report errors */
2421 }
2422 }
2423 }
2424 free_and_return:
2425 diff_free_filespec_data(one);
2426 diff_free_filespec_data(two);
2427 if (data.status)
2428 DIFF_OPT_SET(o, CHECK_FAILED);
2429 }
2431 struct diff_filespec *alloc_filespec(const char *path)
2432 {
2433 int namelen = strlen(path);
2434 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2436 memset(spec, 0, sizeof(*spec));
2437 spec->path = (char *)(spec + 1);
2438 memcpy(spec->path, path, namelen+1);
2439 spec->count = 1;
2440 spec->is_binary = -1;
2441 return spec;
2442 }
2444 void free_filespec(struct diff_filespec *spec)
2445 {
2446 if (!--spec->count) {
2447 diff_free_filespec_data(spec);
2448 free(spec);
2449 }
2450 }
2452 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2453 unsigned short mode)
2454 {
2455 if (mode) {
2456 spec->mode = canon_mode(mode);
2457 hashcpy(spec->sha1, sha1);
2458 spec->sha1_valid = !is_null_sha1(sha1);
2459 }
2460 }
2462 /*
2463 * Given a name and sha1 pair, if the index tells us the file in
2464 * the work tree has that object contents, return true, so that
2465 * prepare_temp_file() does not have to inflate and extract.
2466 */
2467 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2468 {
2469 struct cache_entry *ce;
2470 struct stat st;
2471 int pos, len;
2473 /*
2474 * We do not read the cache ourselves here, because the
2475 * benchmark with my previous version that always reads cache
2476 * shows that it makes things worse for diff-tree comparing
2477 * two linux-2.6 kernel trees in an already checked out work
2478 * tree. This is because most diff-tree comparisons deal with
2479 * only a small number of files, while reading the cache is
2480 * expensive for a large project, and its cost outweighs the
2481 * savings we get by not inflating the object to a temporary
2482 * file. Practically, this code only helps when we are used
2483 * by diff-cache --cached, which does read the cache before
2484 * calling us.
2485 */
2486 if (!active_cache)
2487 return 0;
2489 /* We want to avoid the working directory if our caller
2490 * doesn't need the data in a normal file, this system
2491 * is rather slow with its stat/open/mmap/close syscalls,
2492 * and the object is contained in a pack file. The pack
2493 * is probably already open and will be faster to obtain
2494 * the data through than the working directory. Loose
2495 * objects however would tend to be slower as they need
2496 * to be individually opened and inflated.
2497 */
2498 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2499 return 0;
2501 len = strlen(name);
2502 pos = cache_name_pos(name, len);
2503 if (pos < 0)
2504 return 0;
2505 ce = active_cache[pos];
2507 /*
2508 * This is not the sha1 we are looking for, or
2509 * unreusable because it is not a regular file.
2510 */
2511 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2512 return 0;
2514 /*
2515 * If ce is marked as "assume unchanged", there is no
2516 * guarantee that work tree matches what we are looking for.
2517 */
2518 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2519 return 0;
2521 /*
2522 * If ce matches the file in the work tree, we can reuse it.
2523 */
2524 if (ce_uptodate(ce) ||
2525 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2526 return 1;
2528 return 0;
2529 }
2531 static int populate_from_stdin(struct diff_filespec *s)
2532 {
2533 struct strbuf buf = STRBUF_INIT;
2534 size_t size = 0;
2536 if (strbuf_read(&buf, 0, 0) < 0)
2537 return error("error while reading from stdin %s",
2538 strerror(errno));
2540 s->should_munmap = 0;
2541 s->data = strbuf_detach(&buf, &size);
2542 s->size = size;
2543 s->should_free = 1;
2544 return 0;
2545 }
2547 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2548 {
2549 int len;
2550 char *data = xmalloc(100), *dirty = "";
2552 /* Are we looking at the work tree? */
2553 if (s->dirty_submodule)
2554 dirty = "-dirty";
2556 len = snprintf(data, 100,
2557 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2558 s->data = data;
2559 s->size = len;
2560 s->should_free = 1;
2561 if (size_only) {
2562 s->data = NULL;
2563 free(data);
2564 }
2565 return 0;
2566 }
2568 /*
2569 * While doing rename detection and pickaxe operation, we may need to
2570 * grab the data for the blob (or file) for our own in-core comparison.
2571 * diff_filespec has data and size fields for this purpose.
2572 */
2573 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2574 {
2575 int err = 0;
2576 if (!DIFF_FILE_VALID(s))
2577 die("internal error: asking to populate invalid file.");
2578 if (S_ISDIR(s->mode))
2579 return -1;
2581 if (s->data)
2582 return 0;
2584 if (size_only && 0 < s->size)
2585 return 0;
2587 if (S_ISGITLINK(s->mode))
2588 return diff_populate_gitlink(s, size_only);
2590 if (!s->sha1_valid ||
2591 reuse_worktree_file(s->path, s->sha1, 0)) {
2592 struct strbuf buf = STRBUF_INIT;
2593 struct stat st;
2594 int fd;
2596 if (!strcmp(s->path, "-"))
2597 return populate_from_stdin(s);
2599 if (lstat(s->path, &st) < 0) {
2600 if (errno == ENOENT) {
2601 err_empty:
2602 err = -1;
2603 empty:
2604 s->data = (char *)"";
2605 s->size = 0;
2606 return err;
2607 }
2608 }
2609 s->size = xsize_t(st.st_size);
2610 if (!s->size)
2611 goto empty;
2612 if (S_ISLNK(st.st_mode)) {
2613 struct strbuf sb = STRBUF_INIT;
2615 if (strbuf_readlink(&sb, s->path, s->size))
2616 goto err_empty;
2617 s->size = sb.len;
2618 s->data = strbuf_detach(&sb, NULL);
2619 s->should_free = 1;
2620 return 0;
2621 }
2622 if (size_only)
2623 return 0;
2624 fd = open(s->path, O_RDONLY);
2625 if (fd < 0)
2626 goto err_empty;
2627 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2628 close(fd);
2629 s->should_munmap = 1;
2631 /*
2632 * Convert from working tree format to canonical git format
2633 */
2634 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2635 size_t size = 0;
2636 munmap(s->data, s->size);
2637 s->should_munmap = 0;
2638 s->data = strbuf_detach(&buf, &size);
2639 s->size = size;
2640 s->should_free = 1;
2641 }
2642 }
2643 else {
2644 enum object_type type;
2645 if (size_only) {
2646 type = sha1_object_info(s->sha1, &s->size);
2647 if (type < 0)
2648 die("unable to read %s", sha1_to_hex(s->sha1));
2649 } else {
2650 s->data = read_sha1_file(s->sha1, &type, &s->size);
2651 if (!s->data)
2652 die("unable to read %s", sha1_to_hex(s->sha1));
2653 s->should_free = 1;
2654 }
2655 }
2656 return 0;
2657 }
2659 void diff_free_filespec_blob(struct diff_filespec *s)
2660 {
2661 if (s->should_free)
2662 free(s->data);
2663 else if (s->should_munmap)
2664 munmap(s->data, s->size);
2666 if (s->should_free || s->should_munmap) {
2667 s->should_free = s->should_munmap = 0;
2668 s->data = NULL;
2669 }
2670 }
2672 void diff_free_filespec_data(struct diff_filespec *s)
2673 {
2674 diff_free_filespec_blob(s);
2675 free(s->cnt_data);
2676 s->cnt_data = NULL;
2677 }
2679 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2680 void *blob,
2681 unsigned long size,
2682 const unsigned char *sha1,
2683 int mode)
2684 {
2685 int fd;
2686 struct strbuf buf = STRBUF_INIT;
2687 struct strbuf template = STRBUF_INIT;
2688 char *path_dup = xstrdup(path);
2689 const char *base = basename(path_dup);
2691 /* Generate "XXXXXX_basename.ext" */
2692 strbuf_addstr(&template, "XXXXXX_");
2693 strbuf_addstr(&template, base);
2695 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2696 strlen(base) + 1);
2697 if (fd < 0)
2698 die_errno("unable to create temp-file");
2699 if (convert_to_working_tree(path,
2700 (const char *)blob, (size_t)size, &buf)) {
2701 blob = buf.buf;
2702 size = buf.len;
2703 }
2704 if (write_in_full(fd, blob, size) != size)
2705 die_errno("unable to write temp-file");
2706 close(fd);
2707 temp->name = temp->tmp_path;
2708 strcpy(temp->hex, sha1_to_hex(sha1));
2709 temp->hex[40] = 0;
2710 sprintf(temp->mode, "%06o", mode);
2711 strbuf_release(&buf);
2712 strbuf_release(&template);
2713 free(path_dup);
2714 }
2716 static struct diff_tempfile *prepare_temp_file(const char *name,
2717 struct diff_filespec *one)
2718 {
2719 struct diff_tempfile *temp = claim_diff_tempfile();
2721 if (!DIFF_FILE_VALID(one)) {
2722 not_a_valid_file:
2723 /* A '-' entry produces this for file-2, and
2724 * a '+' entry produces this for file-1.
2725 */
2726 temp->name = "/dev/null";
2727 strcpy(temp->hex, ".");
2728 strcpy(temp->mode, ".");
2729 return temp;
2730 }
2732 if (!remove_tempfile_installed) {
2733 atexit(remove_tempfile);
2734 sigchain_push_common(remove_tempfile_on_signal);
2735 remove_tempfile_installed = 1;
2736 }
2738 if (!one->sha1_valid ||
2739 reuse_worktree_file(name, one->sha1, 1)) {
2740 struct stat st;
2741 if (lstat(name, &st) < 0) {
2742 if (errno == ENOENT)
2743 goto not_a_valid_file;
2744 die_errno("stat(%s)", name);
2745 }
2746 if (S_ISLNK(st.st_mode)) {
2747 struct strbuf sb = STRBUF_INIT;
2748 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2749 die_errno("readlink(%s)", name);
2750 prep_temp_blob(name, temp, sb.buf, sb.len,
2751 (one->sha1_valid ?
2752 one->sha1 : null_sha1),
2753 (one->sha1_valid ?
2754 one->mode : S_IFLNK));
2755 strbuf_release(&sb);
2756 }
2757 else {
2758 /* we can borrow from the file in the work tree */
2759 temp->name = name;
2760 if (!one->sha1_valid)
2761 strcpy(temp->hex, sha1_to_hex(null_sha1));
2762 else
2763 strcpy(temp->hex, sha1_to_hex(one->sha1));
2764 /* Even though we may sometimes borrow the
2765 * contents from the work tree, we always want
2766 * one->mode. mode is trustworthy even when
2767 * !(one->sha1_valid), as long as
2768 * DIFF_FILE_VALID(one).
2769 */
2770 sprintf(temp->mode, "%06o", one->mode);
2771 }
2772 return temp;
2773 }
2774 else {
2775 if (diff_populate_filespec(one, 0))
2776 die("cannot read data blob for %s", one->path);
2777 prep_temp_blob(name, temp, one->data, one->size,
2778 one->sha1, one->mode);
2779 }
2780 return temp;
2781 }
2783 /* An external diff command takes:
2784 *
2785 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2786 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2787 *
2788 */
2789 static void run_external_diff(const char *pgm,
2790 const char *name,
2791 const char *other,
2792 struct diff_filespec *one,
2793 struct diff_filespec *two,
2794 const char *xfrm_msg,
2795 int complete_rewrite)
2796 {
2797 const char *spawn_arg[10];
2798 int retval;
2799 const char **arg = &spawn_arg[0];
2801 if (one && two) {
2802 struct diff_tempfile *temp_one, *temp_two;
2803 const char *othername = (other ? other : name);
2804 temp_one = prepare_temp_file(name, one);
2805 temp_two = prepare_temp_file(othername, two);
2806 *arg++ = pgm;
2807 *arg++ = name;
2808 *arg++ = temp_one->name;
2809 *arg++ = temp_one->hex;
2810 *arg++ = temp_one->mode;
2811 *arg++ = temp_two->name;
2812 *arg++ = temp_two->hex;
2813 *arg++ = temp_two->mode;
2814 if (other) {
2815 *arg++ = other;
2816 *arg++ = xfrm_msg;
2817 }
2818 } else {
2819 *arg++ = pgm;
2820 *arg++ = name;
2821 }
2822 *arg = NULL;
2823 fflush(NULL);
2824 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2825 remove_tempfile();
2826 if (retval) {
2827 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2828 exit(1);
2829 }
2830 }
2832 static int similarity_index(struct diff_filepair *p)
2833 {
2834 return p->score * 100 / MAX_SCORE;
2835 }
2837 static void fill_metainfo(struct strbuf *msg,
2838 const char *name,
2839 const char *other,
2840 struct diff_filespec *one,
2841 struct diff_filespec *two,
2842 struct diff_options *o,
2843 struct diff_filepair *p,
2844 int *must_show_header,
2845 int use_color)
2846 {
2847 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2848 const char *reset = diff_get_color(use_color, DIFF_RESET);
2849 struct strbuf *msgbuf;
2850 char *line_prefix = "";
2852 *must_show_header = 1;
2853 if (o->output_prefix) {
2854 msgbuf = o->output_prefix(o, o->output_prefix_data);
2855 line_prefix = msgbuf->buf;
2856 }
2857 strbuf_init(msg, PATH_MAX * 2 + 300);
2858 switch (p->status) {
2859 case DIFF_STATUS_COPIED:
2860 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2861 line_prefix, set, similarity_index(p));
2862 strbuf_addf(msg, "%s\n%s%scopy from ",
2863 reset, line_prefix, set);
2864 quote_c_style(name, msg, NULL, 0);
2865 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2866 quote_c_style(other, msg, NULL, 0);
2867 strbuf_addf(msg, "%s\n", reset);
2868 break;
2869 case DIFF_STATUS_RENAMED:
2870 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2871 line_prefix, set, similarity_index(p));
2872 strbuf_addf(msg, "%s\n%s%srename from ",
2873 reset, line_prefix, set);
2874 quote_c_style(name, msg, NULL, 0);
2875 strbuf_addf(msg, "%s\n%s%srename to ",
2876 reset, line_prefix, set);
2877 quote_c_style(other, msg, NULL, 0);
2878 strbuf_addf(msg, "%s\n", reset);
2879 break;
2880 case DIFF_STATUS_MODIFIED:
2881 if (p->score) {
2882 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2883 line_prefix,
2884 set, similarity_index(p), reset);
2885 break;
2886 }
2887 /* fallthru */
2888 default:
2889 *must_show_header = 0;
2890 }
2891 if (one && two && hashcmp(one->sha1, two->sha1)) {
2892 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2894 if (DIFF_OPT_TST(o, BINARY)) {
2895 mmfile_t mf;
2896 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2897 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2898 abbrev = 40;
2899 }
2900 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2901 find_unique_abbrev(one->sha1, abbrev));
2902 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2903 if (one->mode == two->mode)
2904 strbuf_addf(msg, " %06o", one->mode);
2905 strbuf_addf(msg, "%s\n", reset);
2906 }
2907 }
2909 static void run_diff_cmd(const char *pgm,
2910 const char *name,
2911 const char *other,
2912 const char *attr_path,
2913 struct diff_filespec *one,
2914 struct diff_filespec *two,
2915 struct strbuf *msg,
2916 struct diff_options *o,
2917 struct diff_filepair *p)
2918 {
2919 const char *xfrm_msg = NULL;
2920 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2921 int must_show_header = 0;
2923 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2924 pgm = NULL;
2925 else {
2926 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2927 if (drv && drv->external)
2928 pgm = drv->external;
2929 }
2931 if (msg) {
2932 /*
2933 * don't use colors when the header is intended for an
2934 * external diff driver
2935 */
2936 fill_metainfo(msg, name, other, one, two, o, p,
2937 &must_show_header,
2938 want_color(o->use_color) && !pgm);
2939 xfrm_msg = msg->len ? msg->buf : NULL;
2940 }
2942 if (pgm) {
2943 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2944 complete_rewrite);
2945 return;
2946 }
2947 if (one && two)
2948 builtin_diff(name, other ? other : name,
2949 one, two, xfrm_msg, must_show_header,
2950 o, complete_rewrite);
2951 else
2952 fprintf(o->file, "* Unmerged path %s\n", name);
2953 }
2955 static void diff_fill_sha1_info(struct diff_filespec *one)
2956 {
2957 if (DIFF_FILE_VALID(one)) {
2958 if (!one->sha1_valid) {
2959 struct stat st;
2960 if (!strcmp(one->path, "-")) {
2961 hashcpy(one->sha1, null_sha1);
2962 return;
2963 }
2964 if (lstat(one->path, &st) < 0)
2965 die_errno("stat '%s'", one->path);
2966 if (index_path(one->sha1, one->path, &st, 0))
2967 die("cannot hash %s", one->path);
2968 }
2969 }
2970 else
2971 hashclr(one->sha1);
2972 }
2974 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2975 {
2976 /* Strip the prefix but do not molest /dev/null and absolute paths */
2977 if (*namep && **namep != '/') {
2978 *namep += prefix_length;
2979 if (**namep == '/')
2980 ++*namep;
2981 }
2982 if (*otherp && **otherp != '/') {
2983 *otherp += prefix_length;
2984 if (**otherp == '/')
2985 ++*otherp;
2986 }
2987 }
2989 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2990 {
2991 const char *pgm = external_diff();
2992 struct strbuf msg;
2993 struct diff_filespec *one = p->one;
2994 struct diff_filespec *two = p->two;
2995 const char *name;
2996 const char *other;
2997 const char *attr_path;
2999 name = p->one->path;
3000 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3001 attr_path = name;
3002 if (o->prefix_length)
3003 strip_prefix(o->prefix_length, &name, &other);
3005 if (DIFF_PAIR_UNMERGED(p)) {
3006 run_diff_cmd(pgm, name, NULL, attr_path,
3007 NULL, NULL, NULL, o, p);
3008 return;
3009 }
3011 diff_fill_sha1_info(one);
3012 diff_fill_sha1_info(two);
3014 if (!pgm &&
3015 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3016 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3017 /*
3018 * a filepair that changes between file and symlink
3019 * needs to be split into deletion and creation.
3020 */
3021 struct diff_filespec *null = alloc_filespec(two->path);
3022 run_diff_cmd(NULL, name, other, attr_path,
3023 one, null, &msg, o, p);
3024 free(null);
3025 strbuf_release(&msg);
3027 null = alloc_filespec(one->path);
3028 run_diff_cmd(NULL, name, other, attr_path,
3029 null, two, &msg, o, p);
3030 free(null);
3031 }
3032 else
3033 run_diff_cmd(pgm, name, other, attr_path,
3034 one, two, &msg, o, p);
3036 strbuf_release(&msg);
3037 }
3039 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3040 struct diffstat_t *diffstat)
3041 {
3042 const char *name;
3043 const char *other;
3044 int complete_rewrite = 0;
3046 if (DIFF_PAIR_UNMERGED(p)) {
3047 /* unmerged */
3048 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3049 return;
3050 }
3052 name = p->one->path;
3053 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3055 if (o->prefix_length)
3056 strip_prefix(o->prefix_length, &name, &other);
3058 diff_fill_sha1_info(p->one);
3059 diff_fill_sha1_info(p->two);
3061 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3062 complete_rewrite = 1;
3063 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3064 }
3066 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3067 {
3068 const char *name;
3069 const char *other;
3070 const char *attr_path;
3072 if (DIFF_PAIR_UNMERGED(p)) {
3073 /* unmerged */
3074 return;
3075 }
3077 name = p->one->path;
3078 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3079 attr_path = other ? other : name;
3081 if (o->prefix_length)
3082 strip_prefix(o->prefix_length, &name, &other);
3084 diff_fill_sha1_info(p->one);
3085 diff_fill_sha1_info(p->two);
3087 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3088 }
3090 void diff_setup(struct diff_options *options)
3091 {
3092 memcpy(options, &default_diff_options, sizeof(*options));
3094 options->file = stdout;
3096 options->line_termination = '\n';
3097 options->break_opt = -1;
3098 options->rename_limit = -1;
3099 options->dirstat_permille = diff_dirstat_permille_default;
3100 options->context = 3;
3102 options->change = diff_change;
3103 options->add_remove = diff_addremove;
3104 options->use_color = diff_use_color_default;
3105 options->detect_rename = diff_detect_rename_default;
3107 if (diff_no_prefix) {
3108 options->a_prefix = options->b_prefix = "";
3109 } else if (!diff_mnemonic_prefix) {
3110 options->a_prefix = "a/";
3111 options->b_prefix = "b/";
3112 }
3113 }
3115 int diff_setup_done(struct diff_options *options)
3116 {
3117 int count = 0;
3119 if (options->output_format & DIFF_FORMAT_NAME)
3120 count++;
3121 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3122 count++;
3123 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3124 count++;
3125 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3126 count++;
3127 if (count > 1)
3128 die("--name-only, --name-status, --check and -s are mutually exclusive");
3130 /*
3131 * Most of the time we can say "there are changes"
3132 * only by checking if there are changed paths, but
3133 * --ignore-whitespace* options force us to look
3134 * inside contents.
3135 */
3137 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3138 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3139 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3140 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3141 else
3142 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3144 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3145 options->detect_rename = DIFF_DETECT_COPY;
3147 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3148 options->prefix = NULL;
3149 if (options->prefix)
3150 options->prefix_length = strlen(options->prefix);
3151 else
3152 options->prefix_length = 0;
3154 if (options->output_format & (DIFF_FORMAT_NAME |
3155 DIFF_FORMAT_NAME_STATUS |
3156 DIFF_FORMAT_CHECKDIFF |
3157 DIFF_FORMAT_NO_OUTPUT))
3158 options->output_format &= ~(DIFF_FORMAT_RAW |
3159 DIFF_FORMAT_NUMSTAT |
3160 DIFF_FORMAT_DIFFSTAT |
3161 DIFF_FORMAT_SHORTSTAT |
3162 DIFF_FORMAT_DIRSTAT |
3163 DIFF_FORMAT_SUMMARY |
3164 DIFF_FORMAT_PATCH);
3166 /*
3167 * These cases always need recursive; we do not drop caller-supplied
3168 * recursive bits for other formats here.
3169 */
3170 if (options->output_format & (DIFF_FORMAT_PATCH |
3171 DIFF_FORMAT_NUMSTAT |
3172 DIFF_FORMAT_DIFFSTAT |
3173 DIFF_FORMAT_SHORTSTAT |
3174 DIFF_FORMAT_DIRSTAT |
3175 DIFF_FORMAT_SUMMARY |
3176 DIFF_FORMAT_CHECKDIFF))
3177 DIFF_OPT_SET(options, RECURSIVE);
3178 /*
3179 * Also pickaxe would not work very well if you do not say recursive
3180 */
3181 if (options->pickaxe)
3182 DIFF_OPT_SET(options, RECURSIVE);
3183 /*
3184 * When patches are generated, submodules diffed against the work tree
3185 * must be checked for dirtiness too so it can be shown in the output
3186 */
3187 if (options->output_format & DIFF_FORMAT_PATCH)
3188 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3190 if (options->detect_rename && options->rename_limit < 0)
3191 options->rename_limit = diff_rename_limit_default;
3192 if (options->setup & DIFF_SETUP_USE_CACHE) {
3193 if (!active_cache)
3194 /* read-cache does not die even when it fails
3195 * so it is safe for us to do this here. Also
3196 * it does not smudge active_cache or active_nr
3197 * when it fails, so we do not have to worry about
3198 * cleaning it up ourselves either.
3199 */
3200 read_cache();
3201 }
3202 if (options->abbrev <= 0 || 40 < options->abbrev)
3203 options->abbrev = 40; /* full */
3205 /*
3206 * It does not make sense to show the first hit we happened
3207 * to have found. It does not make sense not to return with
3208 * exit code in such a case either.
3209 */
3210 if (DIFF_OPT_TST(options, QUICK)) {
3211 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3212 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3213 }
3215 return 0;
3216 }
3218 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3219 {
3220 char c, *eq;
3221 int len;
3223 if (*arg != '-')
3224 return 0;
3225 c = *++arg;
3226 if (!c)
3227 return 0;
3228 if (c == arg_short) {
3229 c = *++arg;
3230 if (!c)
3231 return 1;
3232 if (val && isdigit(c)) {
3233 char *end;
3234 int n = strtoul(arg, &end, 10);
3235 if (*end)
3236 return 0;
3237 *val = n;
3238 return 1;
3239 }
3240 return 0;
3241 }
3242 if (c != '-')
3243 return 0;
3244 arg++;
3245 eq = strchr(arg, '=');
3246 if (eq)
3247 len = eq - arg;
3248 else
3249 len = strlen(arg);
3250 if (!len || strncmp(arg, arg_long, len))
3251 return 0;
3252 if (eq) {
3253 int n;
3254 char *end;
3255 if (!isdigit(*++eq))
3256 return 0;
3257 n = strtoul(eq, &end, 10);
3258 if (*end)
3259 return 0;
3260 *val = n;
3261 }
3262 return 1;
3263 }
3265 static int diff_scoreopt_parse(const char *opt);
3267 static inline int short_opt(char opt, const char **argv,
3268 const char **optarg)
3269 {
3270 const char *arg = argv[0];
3271 if (arg[0] != '-' || arg[1] != opt)
3272 return 0;
3273 if (arg[2] != '\0') {
3274 *optarg = arg + 2;
3275 return 1;
3276 }
3277 if (!argv[1])
3278 die("Option '%c' requires a value", opt);
3279 *optarg = argv[1];
3280 return 2;
3281 }
3283 int parse_long_opt(const char *opt, const char **argv,
3284 const char **optarg)
3285 {
3286 const char *arg = argv[0];
3287 if (arg[0] != '-' || arg[1] != '-')
3288 return 0;
3289 arg += strlen("--");
3290 if (prefixcmp(arg, opt))
3291 return 0;
3292 arg += strlen(opt);
3293 if (*arg == '=') { /* sticked form: --option=value */
3294 *optarg = arg + 1;
3295 return 1;
3296 }
3297 if (*arg != '\0')
3298 return 0;
3299 /* separate form: --option value */
3300 if (!argv[1])
3301 die("Option '--%s' requires a value", opt);
3302 *optarg = argv[1];
3303 return 2;
3304 }
3306 static int stat_opt(struct diff_options *options, const char **av)
3307 {
3308 const char *arg = av[0];
3309 char *end;
3310 int width = options->stat_width;
3311 int name_width = options->stat_name_width;
3312 int count = options->stat_count;
3313 int argcount = 1;
3315 arg += strlen("--stat");
3316 end = (char *)arg;
3318 switch (*arg) {
3319 case '-':
3320 if (!prefixcmp(arg, "-width")) {
3321 arg += strlen("-width");
3322 if (*arg == '=')
3323 width = strtoul(arg + 1, &end, 10);
3324 else if (!*arg && !av[1])
3325 die("Option '--stat-width' requires a value");
3326 else if (!*arg) {
3327 width = strtoul(av[1], &end, 10);
3328 argcount = 2;
3329 }
3330 } else if (!prefixcmp(arg, "-name-width")) {
3331 arg += strlen("-name-width");
3332 if (*arg == '=')
3333 name_width = strtoul(arg + 1, &end, 10);
3334 else if (!*arg && !av[1])
3335 die("Option '--stat-name-width' requires a value");
3336 else if (!*arg) {
3337 name_width = strtoul(av[1], &end, 10);
3338 argcount = 2;
3339 }
3340 } else if (!prefixcmp(arg, "-count")) {
3341 arg += strlen("-count");
3342 if (*arg == '=')
3343 count = strtoul(arg + 1, &end, 10);
3344 else if (!*arg && !av[1])
3345 die("Option '--stat-count' requires a value");
3346 else if (!*arg) {
3347 count = strtoul(av[1], &end, 10);
3348 argcount = 2;
3349 }
3350 }
3351 break;
3352 case '=':
3353 width = strtoul(arg+1, &end, 10);
3354 if (*end == ',')
3355 name_width = strtoul(end+1, &end, 10);
3356 if (*end == ',')
3357 count = strtoul(end+1, &end, 10);
3358 }
3360 /* Important! This checks all the error cases! */
3361 if (*end)
3362 return 0;
3363 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3364 options->stat_name_width = name_width;
3365 options->stat_width = width;
3366 options->stat_count = count;
3367 return argcount;
3368 }
3370 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3371 {
3372 struct strbuf errmsg = STRBUF_INIT;
3373 if (parse_dirstat_params(options, params, &errmsg))
3374 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3375 errmsg.buf);
3376 strbuf_release(&errmsg);
3377 /*
3378 * The caller knows a dirstat-related option is given from the command
3379 * line; allow it to say "return this_function();"
3380 */
3381 options->output_format |= DIFF_FORMAT_DIRSTAT;
3382 return 1;
3383 }
3385 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3386 {
3387 const char *arg = av[0];
3388 const char *optarg;
3389 int argcount;
3391 /* Output format options */
3392 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3393 options->output_format |= DIFF_FORMAT_PATCH;
3394 else if (opt_arg(arg, 'U', "unified", &options->context))
3395 options->output_format |= DIFF_FORMAT_PATCH;
3396 else if (!strcmp(arg, "--raw"))
3397 options->output_format |= DIFF_FORMAT_RAW;
3398 else if (!strcmp(arg, "--patch-with-raw"))
3399 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3400 else if (!strcmp(arg, "--numstat"))
3401 options->output_format |= DIFF_FORMAT_NUMSTAT;
3402 else if (!strcmp(arg, "--shortstat"))
3403 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3404 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3405 return parse_dirstat_opt(options, "");
3406 else if (!prefixcmp(arg, "-X"))
3407 return parse_dirstat_opt(options, arg + 2);
3408 else if (!prefixcmp(arg, "--dirstat="))
3409 return parse_dirstat_opt(options, arg + 10);
3410 else if (!strcmp(arg, "--cumulative"))
3411 return parse_dirstat_opt(options, "cumulative");
3412 else if (!strcmp(arg, "--dirstat-by-file"))
3413 return parse_dirstat_opt(options, "files");
3414 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3415 parse_dirstat_opt(options, "files");
3416 return parse_dirstat_opt(options, arg + 18);
3417 }
3418 else if (!strcmp(arg, "--check"))
3419 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3420 else if (!strcmp(arg, "--summary"))
3421 options->output_format |= DIFF_FORMAT_SUMMARY;
3422 else if (!strcmp(arg, "--patch-with-stat"))
3423 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3424 else if (!strcmp(arg, "--name-only"))
3425 options->output_format |= DIFF_FORMAT_NAME;
3426 else if (!strcmp(arg, "--name-status"))
3427 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3428 else if (!strcmp(arg, "-s"))
3429 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3430 else if (!prefixcmp(arg, "--stat"))
3431 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3432 return stat_opt(options, av);
3434 /* renames options */
3435 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3436 !strcmp(arg, "--break-rewrites")) {
3437 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3438 return error("invalid argument to -B: %s", arg+2);
3439 }
3440 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3441 !strcmp(arg, "--find-renames")) {
3442 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3443 return error("invalid argument to -M: %s", arg+2);
3444 options->detect_rename = DIFF_DETECT_RENAME;
3445 }
3446 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3447 options->irreversible_delete = 1;
3448 }
3449 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3450 !strcmp(arg, "--find-copies")) {
3451 if (options->detect_rename == DIFF_DETECT_COPY)
3452 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3453 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3454 return error("invalid argument to -C: %s", arg+2);
3455 options->detect_rename = DIFF_DETECT_COPY;
3456 }
3457 else if (!strcmp(arg, "--no-renames"))
3458 options->detect_rename = 0;
3459 else if (!strcmp(arg, "--relative"))
3460 DIFF_OPT_SET(options, RELATIVE_NAME);
3461 else if (!prefixcmp(arg, "--relative=")) {
3462 DIFF_OPT_SET(options, RELATIVE_NAME);
3463 options->prefix = arg + 11;
3464 }
3466 /* xdiff options */
3467 else if (!strcmp(arg, "--minimal"))
3468 DIFF_XDL_SET(options, NEED_MINIMAL);
3469 else if (!strcmp(arg, "--no-minimal"))
3470 DIFF_XDL_CLR(options, NEED_MINIMAL);
3471 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3472 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3473 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3474 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3475 else if (!strcmp(arg, "--ignore-space-at-eol"))
3476 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3477 else if (!strcmp(arg, "--patience"))
3478 DIFF_XDL_SET(options, PATIENCE_DIFF);
3479 else if (!strcmp(arg, "--histogram"))
3480 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3482 /* flags options */
3483 else if (!strcmp(arg, "--binary")) {
3484 options->output_format |= DIFF_FORMAT_PATCH;
3485 DIFF_OPT_SET(options, BINARY);
3486 }
3487 else if (!strcmp(arg, "--full-index"))
3488 DIFF_OPT_SET(options, FULL_INDEX);
3489 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3490 DIFF_OPT_SET(options, TEXT);
3491 else if (!strcmp(arg, "-R"))
3492 DIFF_OPT_SET(options, REVERSE_DIFF);
3493 else if (!strcmp(arg, "--find-copies-harder"))
3494 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3495 else if (!strcmp(arg, "--follow"))
3496 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3497 else if (!strcmp(arg, "--color"))
3498 options->use_color = 1;
3499 else if (!prefixcmp(arg, "--color=")) {
3500 int value = git_config_colorbool(NULL, arg+8);
3501 if (value < 0)
3502 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3503 options->use_color = value;
3504 }
3505 else if (!strcmp(arg, "--no-color"))
3506 options->use_color = 0;
3507 else if (!strcmp(arg, "--color-words")) {
3508 options->use_color = 1;
3509 options->word_diff = DIFF_WORDS_COLOR;
3510 }
3511 else if (!prefixcmp(arg, "--color-words=")) {
3512 options->use_color = 1;
3513 options->word_diff = DIFF_WORDS_COLOR;
3514 options->word_regex = arg + 14;
3515 }
3516 else if (!strcmp(arg, "--word-diff")) {
3517 if (options->word_diff == DIFF_WORDS_NONE)
3518 options->word_diff = DIFF_WORDS_PLAIN;
3519 }
3520 else if (!prefixcmp(arg, "--word-diff=")) {
3521 const char *type = arg + 12;
3522 if (!strcmp(type, "plain"))
3523 options->word_diff = DIFF_WORDS_PLAIN;
3524 else if (!strcmp(type, "color")) {
3525 options->use_color = 1;
3526 options->word_diff = DIFF_WORDS_COLOR;
3527 }
3528 else if (!strcmp(type, "porcelain"))
3529 options->word_diff = DIFF_WORDS_PORCELAIN;
3530 else if (!strcmp(type, "none"))
3531 options->word_diff = DIFF_WORDS_NONE;
3532 else
3533 die("bad --word-diff argument: %s", type);
3534 }
3535 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3536 if (options->word_diff == DIFF_WORDS_NONE)
3537 options->word_diff = DIFF_WORDS_PLAIN;
3538 options->word_regex = optarg;
3539 return argcount;
3540 }
3541 else if (!strcmp(arg, "--exit-code"))
3542 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3543 else if (!strcmp(arg, "--quiet"))
3544 DIFF_OPT_SET(options, QUICK);
3545 else if (!strcmp(arg, "--ext-diff"))
3546 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3547 else if (!strcmp(arg, "--no-ext-diff"))
3548 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3549 else if (!strcmp(arg, "--textconv"))
3550 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3551 else if (!strcmp(arg, "--no-textconv"))
3552 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3553 else if (!strcmp(arg, "--ignore-submodules")) {
3554 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3555 handle_ignore_submodules_arg(options, "all");
3556 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3557 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3558 handle_ignore_submodules_arg(options, arg + 20);
3559 } else if (!strcmp(arg, "--submodule"))
3560 DIFF_OPT_SET(options, SUBMODULE_LOG);
3561 else if (!prefixcmp(arg, "--submodule=")) {
3562 if (!strcmp(arg + 12, "log"))
3563 DIFF_OPT_SET(options, SUBMODULE_LOG);
3564 }
3566 /* misc options */
3567 else if (!strcmp(arg, "-z"))
3568 options->line_termination = 0;
3569 else if ((argcount = short_opt('l', av, &optarg))) {
3570 options->rename_limit = strtoul(optarg, NULL, 10);
3571 return argcount;
3572 }
3573 else if ((argcount = short_opt('S', av, &optarg))) {
3574 options->pickaxe = optarg;
3575 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3576 return argcount;
3577 } else if ((argcount = short_opt('G', av, &optarg))) {
3578 options->pickaxe = optarg;
3579 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3580 return argcount;
3581 }
3582 else if (!strcmp(arg, "--pickaxe-all"))
3583 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3584 else if (!strcmp(arg, "--pickaxe-regex"))
3585 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3586 else if ((argcount = short_opt('O', av, &optarg))) {
3587 options->orderfile = optarg;
3588 return argcount;
3589 }
3590 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3591 options->filter = optarg;
3592 return argcount;
3593 }
3594 else if (!strcmp(arg, "--abbrev"))
3595 options->abbrev = DEFAULT_ABBREV;
3596 else if (!prefixcmp(arg, "--abbrev=")) {
3597 options->abbrev = strtoul(arg + 9, NULL, 10);
3598 if (options->abbrev < MINIMUM_ABBREV)
3599 options->abbrev = MINIMUM_ABBREV;
3600 else if (40 < options->abbrev)
3601 options->abbrev = 40;
3602 }
3603 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3604 options->a_prefix = optarg;
3605 return argcount;
3606 }
3607 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3608 options->b_prefix = optarg;
3609 return argcount;
3610 }
3611 else if (!strcmp(arg, "--no-prefix"))
3612 options->a_prefix = options->b_prefix = "";
3613 else if (opt_arg(arg, '\0', "inter-hunk-context",
3614 &options->interhunkcontext))
3615 ;
3616 else if (!strcmp(arg, "-W"))
3617 DIFF_OPT_SET(options, FUNCCONTEXT);
3618 else if (!strcmp(arg, "--function-context"))
3619 DIFF_OPT_SET(options, FUNCCONTEXT);
3620 else if (!strcmp(arg, "--no-function-context"))
3621 DIFF_OPT_CLR(options, FUNCCONTEXT);
3622 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3623 options->file = fopen(optarg, "w");
3624 if (!options->file)
3625 die_errno("Could not open '%s'", optarg);
3626 options->close_file = 1;
3627 return argcount;
3628 } else
3629 return 0;
3630 return 1;
3631 }
3633 int parse_rename_score(const char **cp_p)
3634 {
3635 unsigned long num, scale;
3636 int ch, dot;
3637 const char *cp = *cp_p;
3639 num = 0;
3640 scale = 1;
3641 dot = 0;
3642 for (;;) {
3643 ch = *cp;
3644 if ( !dot && ch == '.' ) {
3645 scale = 1;
3646 dot = 1;
3647 } else if ( ch == '%' ) {
3648 scale = dot ? scale*100 : 100;
3649 cp++; /* % is always at the end */
3650 break;
3651 } else if ( ch >= '0' && ch <= '9' ) {
3652 if ( scale < 100000 ) {
3653 scale *= 10;
3654 num = (num*10) + (ch-'0');
3655 }
3656 } else {
3657 break;
3658 }
3659 cp++;
3660 }
3661 *cp_p = cp;
3663 /* user says num divided by scale and we say internally that
3664 * is MAX_SCORE * num / scale.
3665 */
3666 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3667 }
3669 static int diff_scoreopt_parse(const char *opt)
3670 {
3671 int opt1, opt2, cmd;
3673 if (*opt++ != '-')
3674 return -1;
3675 cmd = *opt++;
3676 if (cmd == '-') {
3677 /* convert the long-form arguments into short-form versions */
3678 if (!prefixcmp(opt, "break-rewrites")) {
3679 opt += strlen("break-rewrites");
3680 if (*opt == 0 || *opt++ == '=')
3681 cmd = 'B';
3682 } else if (!prefixcmp(opt, "find-copies")) {
3683 opt += strlen("find-copies");
3684 if (*opt == 0 || *opt++ == '=')
3685 cmd = 'C';
3686 } else if (!prefixcmp(opt, "find-renames")) {
3687 opt += strlen("find-renames");
3688 if (*opt == 0 || *opt++ == '=')
3689 cmd = 'M';
3690 }
3691 }
3692 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3693 return -1; /* that is not a -M, -C nor -B option */
3695 opt1 = parse_rename_score(&opt);
3696 if (cmd != 'B')
3697 opt2 = 0;
3698 else {
3699 if (*opt == 0)
3700 opt2 = 0;
3701 else if (*opt != '/')
3702 return -1; /* we expect -B80/99 or -B80 */
3703 else {
3704 opt++;
3705 opt2 = parse_rename_score(&opt);
3706 }
3707 }
3708 if (*opt != 0)
3709 return -1;
3710 return opt1 | (opt2 << 16);
3711 }
3713 struct diff_queue_struct diff_queued_diff;
3715 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3716 {
3717 if (queue->alloc <= queue->nr) {
3718 queue->alloc = alloc_nr(queue->alloc);
3719 queue->queue = xrealloc(queue->queue,
3720 sizeof(dp) * queue->alloc);
3721 }
3722 queue->queue[queue->nr++] = dp;
3723 }
3725 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3726 struct diff_filespec *one,
3727 struct diff_filespec *two)
3728 {
3729 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3730 dp->one = one;
3731 dp->two = two;
3732 if (queue)
3733 diff_q(queue, dp);
3734 return dp;
3735 }
3737 void diff_free_filepair(struct diff_filepair *p)
3738 {
3739 free_filespec(p->one);
3740 free_filespec(p->two);
3741 free(p);
3742 }
3744 /* This is different from find_unique_abbrev() in that
3745 * it stuffs the result with dots for alignment.
3746 */
3747 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3748 {
3749 int abblen;
3750 const char *abbrev;
3751 if (len == 40)
3752 return sha1_to_hex(sha1);
3754 abbrev = find_unique_abbrev(sha1, len);
3755 abblen = strlen(abbrev);
3756 if (abblen < 37) {
3757 static char hex[41];
3758 if (len < abblen && abblen <= len + 2)
3759 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3760 else
3761 sprintf(hex, "%s...", abbrev);
3762 return hex;
3763 }
3764 return sha1_to_hex(sha1);
3765 }
3767 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3768 {
3769 int line_termination = opt->line_termination;
3770 int inter_name_termination = line_termination ? '\t' : '\0';
3771 if (opt->output_prefix) {
3772 struct strbuf *msg = NULL;
3773 msg = opt->output_prefix(opt, opt->output_prefix_data);
3774 fprintf(opt->file, "%s", msg->buf);
3775 }
3777 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3778 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3779 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3780 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3781 }
3782 if (p->score) {
3783 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3784 inter_name_termination);
3785 } else {
3786 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3787 }
3789 if (p->status == DIFF_STATUS_COPIED ||
3790 p->status == DIFF_STATUS_RENAMED) {
3791 const char *name_a, *name_b;
3792 name_a = p->one->path;
3793 name_b = p->two->path;
3794 strip_prefix(opt->prefix_length, &name_a, &name_b);
3795 write_name_quoted(name_a, opt->file, inter_name_termination);
3796 write_name_quoted(name_b, opt->file, line_termination);
3797 } else {
3798 const char *name_a, *name_b;
3799 name_a = p->one->mode ? p->one->path : p->two->path;
3800 name_b = NULL;
3801 strip_prefix(opt->prefix_length, &name_a, &name_b);
3802 write_name_quoted(name_a, opt->file, line_termination);
3803 }
3804 }
3806 int diff_unmodified_pair(struct diff_filepair *p)
3807 {
3808 /* This function is written stricter than necessary to support
3809 * the currently implemented transformers, but the idea is to
3810 * let transformers to produce diff_filepairs any way they want,
3811 * and filter and clean them up here before producing the output.
3812 */
3813 struct diff_filespec *one = p->one, *two = p->two;
3815 if (DIFF_PAIR_UNMERGED(p))
3816 return 0; /* unmerged is interesting */
3818 /* deletion, addition, mode or type change
3819 * and rename are all interesting.
3820 */
3821 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3822 DIFF_PAIR_MODE_CHANGED(p) ||
3823 strcmp(one->path, two->path))
3824 return 0;
3826 /* both are valid and point at the same path. that is, we are
3827 * dealing with a change.
3828 */
3829 if (one->sha1_valid && two->sha1_valid &&
3830 !hashcmp(one->sha1, two->sha1) &&
3831 !one->dirty_submodule && !two->dirty_submodule)
3832 return 1; /* no change */
3833 if (!one->sha1_valid && !two->sha1_valid)
3834 return 1; /* both look at the same file on the filesystem. */
3835 return 0;
3836 }
3838 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3839 {
3840 if (diff_unmodified_pair(p))
3841 return;
3843 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3844 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3845 return; /* no tree diffs in patch format */
3847 run_diff(p, o);
3848 }
3850 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3851 struct diffstat_t *diffstat)
3852 {
3853 if (diff_unmodified_pair(p))
3854 return;
3856 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3857 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3858 return; /* no useful stat for tree diffs */
3860 run_diffstat(p, o, diffstat);
3861 }
3863 static void diff_flush_checkdiff(struct diff_filepair *p,
3864 struct diff_options *o)
3865 {
3866 if (diff_unmodified_pair(p))
3867 return;
3869 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3870 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3871 return; /* nothing to check in tree diffs */
3873 run_checkdiff(p, o);
3874 }
3876 int diff_queue_is_empty(void)
3877 {
3878 struct diff_queue_struct *q = &diff_queued_diff;
3879 int i;
3880 for (i = 0; i < q->nr; i++)
3881 if (!diff_unmodified_pair(q->queue[i]))
3882 return 0;
3883 return 1;
3884 }
3886 #if DIFF_DEBUG
3887 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3888 {
3889 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3890 x, one ? one : "",
3891 s->path,
3892 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3893 s->mode,
3894 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3895 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3896 x, one ? one : "",
3897 s->size, s->xfrm_flags);
3898 }
3900 void diff_debug_filepair(const struct diff_filepair *p, int i)
3901 {
3902 diff_debug_filespec(p->one, i, "one");
3903 diff_debug_filespec(p->two, i, "two");
3904 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3905 p->score, p->status ? p->status : '?',
3906 p->one->rename_used, p->broken_pair);
3907 }
3909 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3910 {
3911 int i;
3912 if (msg)
3913 fprintf(stderr, "%s\n", msg);
3914 fprintf(stderr, "q->nr = %d\n", q->nr);
3915 for (i = 0; i < q->nr; i++) {
3916 struct diff_filepair *p = q->queue[i];
3917 diff_debug_filepair(p, i);
3918 }
3919 }
3920 #endif
3922 static void diff_resolve_rename_copy(void)
3923 {
3924 int i;
3925 struct diff_filepair *p;
3926 struct diff_queue_struct *q = &diff_queued_diff;
3928 diff_debug_queue("resolve-rename-copy", q);
3930 for (i = 0; i < q->nr; i++) {
3931 p = q->queue[i];
3932 p->status = 0; /* undecided */
3933 if (DIFF_PAIR_UNMERGED(p))
3934 p->status = DIFF_STATUS_UNMERGED;
3935 else if (!DIFF_FILE_VALID(p->one))
3936 p->status = DIFF_STATUS_ADDED;
3937 else if (!DIFF_FILE_VALID(p->two))
3938 p->status = DIFF_STATUS_DELETED;
3939 else if (DIFF_PAIR_TYPE_CHANGED(p))
3940 p->status = DIFF_STATUS_TYPE_CHANGED;
3942 /* from this point on, we are dealing with a pair
3943 * whose both sides are valid and of the same type, i.e.
3944 * either in-place edit or rename/copy edit.
3945 */
3946 else if (DIFF_PAIR_RENAME(p)) {
3947 /*
3948 * A rename might have re-connected a broken
3949 * pair up, causing the pathnames to be the
3950 * same again. If so, that's not a rename at
3951 * all, just a modification..
3952 *
3953 * Otherwise, see if this source was used for
3954 * multiple renames, in which case we decrement
3955 * the count, and call it a copy.
3956 */
3957 if (!strcmp(p->one->path, p->two->path))
3958 p->status = DIFF_STATUS_MODIFIED;
3959 else if (--p->one->rename_used > 0)
3960 p->status = DIFF_STATUS_COPIED;
3961 else
3962 p->status = DIFF_STATUS_RENAMED;
3963 }
3964 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3965 p->one->mode != p->two->mode ||
3966 p->one->dirty_submodule ||
3967 p->two->dirty_submodule ||
3968 is_null_sha1(p->one->sha1))
3969 p->status = DIFF_STATUS_MODIFIED;
3970 else {
3971 /* This is a "no-change" entry and should not
3972 * happen anymore, but prepare for broken callers.
3973 */
3974 error("feeding unmodified %s to diffcore",
3975 p->one->path);
3976 p->status = DIFF_STATUS_UNKNOWN;
3977 }
3978 }
3979 diff_debug_queue("resolve-rename-copy done", q);
3980 }
3982 static int check_pair_status(struct diff_filepair *p)
3983 {
3984 switch (p->status) {
3985 case DIFF_STATUS_UNKNOWN:
3986 return 0;
3987 case 0:
3988 die("internal error in diff-resolve-rename-copy");
3989 default:
3990 return 1;
3991 }
3992 }
3994 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3995 {
3996 int fmt = opt->output_format;
3998 if (fmt & DIFF_FORMAT_CHECKDIFF)
3999 diff_flush_checkdiff(p, opt);
4000 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4001 diff_flush_raw(p, opt);
4002 else if (fmt & DIFF_FORMAT_NAME) {
4003 const char *name_a, *name_b;
4004 name_a = p->two->path;
4005 name_b = NULL;
4006 strip_prefix(opt->prefix_length, &name_a, &name_b);
4007 write_name_quoted(name_a, opt->file, opt->line_termination);
4008 }
4009 }
4011 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4012 {
4013 if (fs->mode)
4014 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4015 else
4016 fprintf(file, " %s ", newdelete);
4017 write_name_quoted(fs->path, file, '\n');
4018 }
4021 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4022 const char *line_prefix)
4023 {
4024 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4025 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4026 p->two->mode, show_name ? ' ' : '\n');
4027 if (show_name) {
4028 write_name_quoted(p->two->path, file, '\n');
4029 }
4030 }
4031 }
4033 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4034 const char *line_prefix)
4035 {
4036 char *names = pprint_rename(p->one->path, p->two->path);
4038 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4039 free(names);
4040 show_mode_change(file, p, 0, line_prefix);
4041 }
4043 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4044 {
4045 FILE *file = opt->file;
4046 char *line_prefix = "";
4048 if (opt->output_prefix) {
4049 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4050 line_prefix = buf->buf;
4051 }
4053 switch(p->status) {
4054 case DIFF_STATUS_DELETED:
4055 fputs(line_prefix, file);
4056 show_file_mode_name(file, "delete", p->one);
4057 break;
4058 case DIFF_STATUS_ADDED:
4059 fputs(line_prefix, file);
4060 show_file_mode_name(file, "create", p->two);
4061 break;
4062 case DIFF_STATUS_COPIED:
4063 fputs(line_prefix, file);
4064 show_rename_copy(file, "copy", p, line_prefix);
4065 break;
4066 case DIFF_STATUS_RENAMED:
4067 fputs(line_prefix, file);
4068 show_rename_copy(file, "rename", p, line_prefix);
4069 break;
4070 default:
4071 if (p->score) {
4072 fprintf(file, "%s rewrite ", line_prefix);
4073 write_name_quoted(p->two->path, file, ' ');
4074 fprintf(file, "(%d%%)\n", similarity_index(p));
4075 }
4076 show_mode_change(file, p, !p->score, line_prefix);
4077 break;
4078 }
4079 }
4081 struct patch_id_t {
4082 git_SHA_CTX *ctx;
4083 int patchlen;
4084 };
4086 static int remove_space(char *line, int len)
4087 {
4088 int i;
4089 char *dst = line;
4090 unsigned char c;
4092 for (i = 0; i < len; i++)
4093 if (!isspace((c = line[i])))
4094 *dst++ = c;
4096 return dst - line;
4097 }
4099 static void patch_id_consume(void *priv, char *line, unsigned long len)
4100 {
4101 struct patch_id_t *data = priv;
4102 int new_len;
4104 /* Ignore line numbers when computing the SHA1 of the patch */
4105 if (!prefixcmp(line, "@@ -"))
4106 return;
4108 new_len = remove_space(line, len);
4110 git_SHA1_Update(data->ctx, line, new_len);
4111 data->patchlen += new_len;
4112 }
4114 /* returns 0 upon success, and writes result into sha1 */
4115 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4116 {
4117 struct diff_queue_struct *q = &diff_queued_diff;
4118 int i;
4119 git_SHA_CTX ctx;
4120 struct patch_id_t data;
4121 char buffer[PATH_MAX * 4 + 20];
4123 git_SHA1_Init(&ctx);
4124 memset(&data, 0, sizeof(struct patch_id_t));
4125 data.ctx = &ctx;
4127 for (i = 0; i < q->nr; i++) {
4128 xpparam_t xpp;
4129 xdemitconf_t xecfg;
4130 mmfile_t mf1, mf2;
4131 struct diff_filepair *p = q->queue[i];
4132 int len1, len2;
4134 memset(&xpp, 0, sizeof(xpp));
4135 memset(&xecfg, 0, sizeof(xecfg));
4136 if (p->status == 0)
4137 return error("internal diff status error");
4138 if (p->status == DIFF_STATUS_UNKNOWN)
4139 continue;
4140 if (diff_unmodified_pair(p))
4141 continue;
4142 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4143 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4144 continue;
4145 if (DIFF_PAIR_UNMERGED(p))
4146 continue;
4148 diff_fill_sha1_info(p->one);
4149 diff_fill_sha1_info(p->two);
4150 if (fill_mmfile(&mf1, p->one) < 0 ||
4151 fill_mmfile(&mf2, p->two) < 0)
4152 return error("unable to read files to diff");
4154 len1 = remove_space(p->one->path, strlen(p->one->path));
4155 len2 = remove_space(p->two->path, strlen(p->two->path));
4156 if (p->one->mode == 0)
4157 len1 = snprintf(buffer, sizeof(buffer),
4158 "diff--gita/%.*sb/%.*s"
4159 "newfilemode%06o"
4160 "---/dev/null"
4161 "+++b/%.*s",
4162 len1, p->one->path,
4163 len2, p->two->path,
4164 p->two->mode,
4165 len2, p->two->path);
4166 else if (p->two->mode == 0)
4167 len1 = snprintf(buffer, sizeof(buffer),
4168 "diff--gita/%.*sb/%.*s"
4169 "deletedfilemode%06o"
4170 "---a/%.*s"
4171 "+++/dev/null",
4172 len1, p->one->path,
4173 len2, p->two->path,
4174 p->one->mode,
4175 len1, p->one->path);
4176 else
4177 len1 = snprintf(buffer, sizeof(buffer),
4178 "diff--gita/%.*sb/%.*s"
4179 "---a/%.*s"
4180 "+++b/%.*s",
4181 len1, p->one->path,
4182 len2, p->two->path,
4183 len1, p->one->path,
4184 len2, p->two->path);
4185 git_SHA1_Update(&ctx, buffer, len1);
4187 if (diff_filespec_is_binary(p->one) ||
4188 diff_filespec_is_binary(p->two)) {
4189 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4190 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4191 continue;
4192 }
4194 xpp.flags = 0;
4195 xecfg.ctxlen = 3;
4196 xecfg.flags = 0;
4197 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4198 &xpp, &xecfg);
4199 }
4201 git_SHA1_Final(sha1, &ctx);
4202 return 0;
4203 }
4205 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4206 {
4207 struct diff_queue_struct *q = &diff_queued_diff;
4208 int i;
4209 int result = diff_get_patch_id(options, sha1);
4211 for (i = 0; i < q->nr; i++)
4212 diff_free_filepair(q->queue[i]);
4214 free(q->queue);
4215 DIFF_QUEUE_CLEAR(q);
4217 return result;
4218 }
4220 static int is_summary_empty(const struct diff_queue_struct *q)
4221 {
4222 int i;
4224 for (i = 0; i < q->nr; i++) {
4225 const struct diff_filepair *p = q->queue[i];
4227 switch (p->status) {
4228 case DIFF_STATUS_DELETED:
4229 case DIFF_STATUS_ADDED:
4230 case DIFF_STATUS_COPIED:
4231 case DIFF_STATUS_RENAMED:
4232 return 0;
4233 default:
4234 if (p->score)
4235 return 0;
4236 if (p->one->mode && p->two->mode &&
4237 p->one->mode != p->two->mode)
4238 return 0;
4239 break;
4240 }
4241 }
4242 return 1;
4243 }
4245 static const char rename_limit_warning[] =
4246 "inexact rename detection was skipped due to too many files.";
4248 static const char degrade_cc_to_c_warning[] =
4249 "only found copies from modified paths due to too many files.";
4251 static const char rename_limit_advice[] =
4252 "you may want to set your %s variable to at least "
4253 "%d and retry the command.";
4255 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4256 {
4257 if (degraded_cc)
4258 warning(degrade_cc_to_c_warning);
4259 else if (needed)
4260 warning(rename_limit_warning);
4261 else
4262 return;
4263 if (0 < needed && needed < 32767)
4264 warning(rename_limit_advice, varname, needed);
4265 }
4267 void diff_flush(struct diff_options *options)
4268 {
4269 struct diff_queue_struct *q = &diff_queued_diff;
4270 int i, output_format = options->output_format;
4271 int separator = 0;
4272 int dirstat_by_line = 0;
4274 /*
4275 * Order: raw, stat, summary, patch
4276 * or: name/name-status/checkdiff (other bits clear)
4277 */
4278 if (!q->nr)
4279 goto free_queue;
4281 if (output_format & (DIFF_FORMAT_RAW |
4282 DIFF_FORMAT_NAME |
4283 DIFF_FORMAT_NAME_STATUS |
4284 DIFF_FORMAT_CHECKDIFF)) {
4285 for (i = 0; i < q->nr; i++) {
4286 struct diff_filepair *p = q->queue[i];
4287 if (check_pair_status(p))
4288 flush_one_pair(p, options);
4289 }
4290 separator++;
4291 }
4293 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4294 dirstat_by_line = 1;
4296 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4297 dirstat_by_line) {
4298 struct diffstat_t diffstat;
4300 memset(&diffstat, 0, sizeof(struct diffstat_t));
4301 for (i = 0; i < q->nr; i++) {
4302 struct diff_filepair *p = q->queue[i];
4303 if (check_pair_status(p))
4304 diff_flush_stat(p, options, &diffstat);
4305 }
4306 if (output_format & DIFF_FORMAT_NUMSTAT)
4307 show_numstat(&diffstat, options);
4308 if (output_format & DIFF_FORMAT_DIFFSTAT)
4309 show_stats(&diffstat, options);
4310 if (output_format & DIFF_FORMAT_SHORTSTAT)
4311 show_shortstats(&diffstat, options);
4312 if (output_format & DIFF_FORMAT_DIRSTAT)
4313 show_dirstat_by_line(&diffstat, options);
4314 free_diffstat_info(&diffstat);
4315 separator++;
4316 }
4317 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4318 show_dirstat(options);
4320 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4321 for (i = 0; i < q->nr; i++) {
4322 diff_summary(options, q->queue[i]);
4323 }
4324 separator++;
4325 }
4327 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4328 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4329 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4330 /*
4331 * run diff_flush_patch for the exit status. setting
4332 * options->file to /dev/null should be safe, becaue we
4333 * aren't supposed to produce any output anyway.
4334 */
4335 if (options->close_file)
4336 fclose(options->file);
4337 options->file = fopen("/dev/null", "w");
4338 if (!options->file)
4339 die_errno("Could not open /dev/null");
4340 options->close_file = 1;
4341 for (i = 0; i < q->nr; i++) {
4342 struct diff_filepair *p = q->queue[i];
4343 if (check_pair_status(p))
4344 diff_flush_patch(p, options);
4345 if (options->found_changes)
4346 break;
4347 }
4348 }
4350 if (output_format & DIFF_FORMAT_PATCH) {
4351 if (separator) {
4352 putc(options->line_termination, options->file);
4353 if (options->stat_sep) {
4354 /* attach patch instead of inline */
4355 fputs(options->stat_sep, options->file);
4356 }
4357 }
4359 for (i = 0; i < q->nr; i++) {
4360 struct diff_filepair *p = q->queue[i];
4361 if (check_pair_status(p))
4362 diff_flush_patch(p, options);
4363 }
4364 }
4366 if (output_format & DIFF_FORMAT_CALLBACK)
4367 options->format_callback(q, options, options->format_callback_data);
4369 for (i = 0; i < q->nr; i++)
4370 diff_free_filepair(q->queue[i]);
4371 free_queue:
4372 free(q->queue);
4373 DIFF_QUEUE_CLEAR(q);
4374 if (options->close_file)
4375 fclose(options->file);
4377 /*
4378 * Report the content-level differences with HAS_CHANGES;
4379 * diff_addremove/diff_change does not set the bit when
4380 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4381 */
4382 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4383 if (options->found_changes)
4384 DIFF_OPT_SET(options, HAS_CHANGES);
4385 else
4386 DIFF_OPT_CLR(options, HAS_CHANGES);
4387 }
4388 }
4390 static void diffcore_apply_filter(const char *filter)
4391 {
4392 int i;
4393 struct diff_queue_struct *q = &diff_queued_diff;
4394 struct diff_queue_struct outq;
4395 DIFF_QUEUE_CLEAR(&outq);
4397 if (!filter)
4398 return;
4400 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4401 int found;
4402 for (i = found = 0; !found && i < q->nr; i++) {
4403 struct diff_filepair *p = q->queue[i];
4404 if (((p->status == DIFF_STATUS_MODIFIED) &&
4405 ((p->score &&
4406 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4407 (!p->score &&
4408 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4409 ((p->status != DIFF_STATUS_MODIFIED) &&
4410 strchr(filter, p->status)))
4411 found++;
4412 }
4413 if (found)
4414 return;
4416 /* otherwise we will clear the whole queue
4417 * by copying the empty outq at the end of this
4418 * function, but first clear the current entries
4419 * in the queue.
4420 */
4421 for (i = 0; i < q->nr; i++)
4422 diff_free_filepair(q->queue[i]);
4423 }
4424 else {
4425 /* Only the matching ones */
4426 for (i = 0; i < q->nr; i++) {
4427 struct diff_filepair *p = q->queue[i];
4429 if (((p->status == DIFF_STATUS_MODIFIED) &&
4430 ((p->score &&
4431 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4432 (!p->score &&
4433 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4434 ((p->status != DIFF_STATUS_MODIFIED) &&
4435 strchr(filter, p->status)))
4436 diff_q(&outq, p);
4437 else
4438 diff_free_filepair(p);
4439 }
4440 }
4441 free(q->queue);
4442 *q = outq;
4443 }
4445 /* Check whether two filespecs with the same mode and size are identical */
4446 static int diff_filespec_is_identical(struct diff_filespec *one,
4447 struct diff_filespec *two)
4448 {
4449 if (S_ISGITLINK(one->mode))
4450 return 0;
4451 if (diff_populate_filespec(one, 0))
4452 return 0;
4453 if (diff_populate_filespec(two, 0))
4454 return 0;
4455 return !memcmp(one->data, two->data, one->size);
4456 }
4458 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4459 {
4460 int i;
4461 struct diff_queue_struct *q = &diff_queued_diff;
4462 struct diff_queue_struct outq;
4463 DIFF_QUEUE_CLEAR(&outq);
4465 for (i = 0; i < q->nr; i++) {
4466 struct diff_filepair *p = q->queue[i];
4468 /*
4469 * 1. Entries that come from stat info dirtiness
4470 * always have both sides (iow, not create/delete),
4471 * one side of the object name is unknown, with
4472 * the same mode and size. Keep the ones that
4473 * do not match these criteria. They have real
4474 * differences.
4475 *
4476 * 2. At this point, the file is known to be modified,
4477 * with the same mode and size, and the object
4478 * name of one side is unknown. Need to inspect
4479 * the identical contents.
4480 */
4481 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4482 !DIFF_FILE_VALID(p->two) ||
4483 (p->one->sha1_valid && p->two->sha1_valid) ||
4484 (p->one->mode != p->two->mode) ||
4485 diff_populate_filespec(p->one, 1) ||
4486 diff_populate_filespec(p->two, 1) ||
4487 (p->one->size != p->two->size) ||
4488 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4489 diff_q(&outq, p);
4490 else {
4491 /*
4492 * The caller can subtract 1 from skip_stat_unmatch
4493 * to determine how many paths were dirty only
4494 * due to stat info mismatch.
4495 */
4496 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4497 diffopt->skip_stat_unmatch++;
4498 diff_free_filepair(p);
4499 }
4500 }
4501 free(q->queue);
4502 *q = outq;
4503 }
4505 static int diffnamecmp(const void *a_, const void *b_)
4506 {
4507 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4508 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4509 const char *name_a, *name_b;
4511 name_a = a->one ? a->one->path : a->two->path;
4512 name_b = b->one ? b->one->path : b->two->path;
4513 return strcmp(name_a, name_b);
4514 }
4516 void diffcore_fix_diff_index(struct diff_options *options)
4517 {
4518 struct diff_queue_struct *q = &diff_queued_diff;
4519 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4520 }
4522 void diffcore_std(struct diff_options *options)
4523 {
4524 if (options->skip_stat_unmatch)
4525 diffcore_skip_stat_unmatch(options);
4526 if (!options->found_follow) {
4527 /* See try_to_follow_renames() in tree-diff.c */
4528 if (options->break_opt != -1)
4529 diffcore_break(options->break_opt);
4530 if (options->detect_rename)
4531 diffcore_rename(options);
4532 if (options->break_opt != -1)
4533 diffcore_merge_broken();
4534 }
4535 if (options->pickaxe)
4536 diffcore_pickaxe(options);
4537 if (options->orderfile)
4538 diffcore_order(options->orderfile);
4539 if (!options->found_follow)
4540 /* See try_to_follow_renames() in tree-diff.c */
4541 diff_resolve_rename_copy();
4542 diffcore_apply_filter(options->filter);
4544 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4545 DIFF_OPT_SET(options, HAS_CHANGES);
4546 else
4547 DIFF_OPT_CLR(options, HAS_CHANGES);
4549 options->found_follow = 0;
4550 }
4552 int diff_result_code(struct diff_options *opt, int status)
4553 {
4554 int result = 0;
4556 diff_warn_rename_limit("diff.renamelimit",
4557 opt->needed_rename_limit,
4558 opt->degraded_cc_to_c);
4559 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4560 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4561 return status;
4562 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4563 DIFF_OPT_TST(opt, HAS_CHANGES))
4564 result |= 01;
4565 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4566 DIFF_OPT_TST(opt, CHECK_FAILED))
4567 result |= 02;
4568 return result;
4569 }
4571 int diff_can_quit_early(struct diff_options *opt)
4572 {
4573 return (DIFF_OPT_TST(opt, QUICK) &&
4574 !opt->filter &&
4575 DIFF_OPT_TST(opt, HAS_CHANGES));
4576 }
4578 /*
4579 * Shall changes to this submodule be ignored?
4580 *
4581 * Submodule changes can be configured to be ignored separately for each path,
4582 * but that configuration can be overridden from the command line.
4583 */
4584 static int is_submodule_ignored(const char *path, struct diff_options *options)
4585 {
4586 int ignored = 0;
4587 unsigned orig_flags = options->flags;
4588 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4589 set_diffopt_flags_from_submodule_config(options, path);
4590 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4591 ignored = 1;
4592 options->flags = orig_flags;
4593 return ignored;
4594 }
4596 void diff_addremove(struct diff_options *options,
4597 int addremove, unsigned mode,
4598 const unsigned char *sha1,
4599 const char *concatpath, unsigned dirty_submodule)
4600 {
4601 struct diff_filespec *one, *two;
4603 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4604 return;
4606 /* This may look odd, but it is a preparation for
4607 * feeding "there are unchanged files which should
4608 * not produce diffs, but when you are doing copy
4609 * detection you would need them, so here they are"
4610 * entries to the diff-core. They will be prefixed
4611 * with something like '=' or '*' (I haven't decided
4612 * which but should not make any difference).
4613 * Feeding the same new and old to diff_change()
4614 * also has the same effect.
4615 * Before the final output happens, they are pruned after
4616 * merged into rename/copy pairs as appropriate.
4617 */
4618 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4619 addremove = (addremove == '+' ? '-' :
4620 addremove == '-' ? '+' : addremove);
4622 if (options->prefix &&
4623 strncmp(concatpath, options->prefix, options->prefix_length))
4624 return;
4626 one = alloc_filespec(concatpath);
4627 two = alloc_filespec(concatpath);
4629 if (addremove != '+')
4630 fill_filespec(one, sha1, mode);
4631 if (addremove != '-') {
4632 fill_filespec(two, sha1, mode);
4633 two->dirty_submodule = dirty_submodule;
4634 }
4636 diff_queue(&diff_queued_diff, one, two);
4637 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4638 DIFF_OPT_SET(options, HAS_CHANGES);
4639 }
4641 void diff_change(struct diff_options *options,
4642 unsigned old_mode, unsigned new_mode,
4643 const unsigned char *old_sha1,
4644 const unsigned char *new_sha1,
4645 const char *concatpath,
4646 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4647 {
4648 struct diff_filespec *one, *two;
4650 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4651 is_submodule_ignored(concatpath, options))
4652 return;
4654 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4655 unsigned tmp;
4656 const unsigned char *tmp_c;
4657 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4658 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4659 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4660 new_dirty_submodule = tmp;
4661 }
4663 if (options->prefix &&
4664 strncmp(concatpath, options->prefix, options->prefix_length))
4665 return;
4667 one = alloc_filespec(concatpath);
4668 two = alloc_filespec(concatpath);
4669 fill_filespec(one, old_sha1, old_mode);
4670 fill_filespec(two, new_sha1, new_mode);
4671 one->dirty_submodule = old_dirty_submodule;
4672 two->dirty_submodule = new_dirty_submodule;
4674 diff_queue(&diff_queued_diff, one, two);
4675 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4676 DIFF_OPT_SET(options, HAS_CHANGES);
4677 }
4679 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4680 {
4681 struct diff_filepair *pair;
4682 struct diff_filespec *one, *two;
4684 if (options->prefix &&
4685 strncmp(path, options->prefix, options->prefix_length))
4686 return NULL;
4688 one = alloc_filespec(path);
4689 two = alloc_filespec(path);
4690 pair = diff_queue(&diff_queued_diff, one, two);
4691 pair->is_unmerged = 1;
4692 return pair;
4693 }
4695 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4696 size_t *outsize)
4697 {
4698 struct diff_tempfile *temp;
4699 const char *argv[3];
4700 const char **arg = argv;
4701 struct child_process child;
4702 struct strbuf buf = STRBUF_INIT;
4703 int err = 0;
4705 temp = prepare_temp_file(spec->path, spec);
4706 *arg++ = pgm;
4707 *arg++ = temp->name;
4708 *arg = NULL;
4710 memset(&child, 0, sizeof(child));
4711 child.use_shell = 1;
4712 child.argv = argv;
4713 child.out = -1;
4714 if (start_command(&child)) {
4715 remove_tempfile();
4716 return NULL;
4717 }
4719 if (strbuf_read(&buf, child.out, 0) < 0)
4720 err = error("error reading from textconv command '%s'", pgm);
4721 close(child.out);
4723 if (finish_command(&child) || err) {
4724 strbuf_release(&buf);
4725 remove_tempfile();
4726 return NULL;
4727 }
4728 remove_tempfile();
4730 return strbuf_detach(&buf, outsize);
4731 }
4733 size_t fill_textconv(struct userdiff_driver *driver,
4734 struct diff_filespec *df,
4735 char **outbuf)
4736 {
4737 size_t size;
4739 if (!driver || !driver->textconv) {
4740 if (!DIFF_FILE_VALID(df)) {
4741 *outbuf = "";
4742 return 0;
4743 }
4744 if (diff_populate_filespec(df, 0))
4745 die("unable to read files to diff");
4746 *outbuf = df->data;
4747 return df->size;
4748 }
4750 if (driver->textconv_cache && df->sha1_valid) {
4751 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4752 &size);
4753 if (*outbuf)
4754 return size;
4755 }
4757 *outbuf = run_textconv(driver->textconv, df, &size);
4758 if (!*outbuf)
4759 die("unable to read files to diff");
4761 if (driver->textconv_cache && df->sha1_valid) {
4762 /* ignore errors, as we might be in a readonly repository */
4763 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4764 size);
4765 /*
4766 * we could save up changes and flush them all at the end,
4767 * but we would need an extra call after all diffing is done.
4768 * Since generating a cache entry is the slow path anyway,
4769 * this extra overhead probably isn't a big deal.
4770 */
4771 notes_cache_write(driver->textconv_cache);
4772 }
4774 return size;
4775 }