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diff --stat: enable limiting of the graph part
[alt-git.git] / diff.c
blob8f2abc8fe4b73590cbdecbaaa5cfe75eb1a4829c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static int diff_dirstat_permille_default = 30;
35 static struct diff_options default_diff_options;
36
37 static char diff_colors[][COLOR_MAXLEN] = {
38 GIT_COLOR_RESET,
39 GIT_COLOR_NORMAL, /* PLAIN */
40 GIT_COLOR_BOLD, /* METAINFO */
41 GIT_COLOR_CYAN, /* FRAGINFO */
42 GIT_COLOR_RED, /* OLD */
43 GIT_COLOR_GREEN, /* NEW */
44 GIT_COLOR_YELLOW, /* COMMIT */
45 GIT_COLOR_BG_RED, /* WHITESPACE */
46 GIT_COLOR_NORMAL, /* FUNCINFO */
47 };
48
49 static int parse_diff_color_slot(const char *var, int ofs)
50 {
51 if (!strcasecmp(var+ofs, "plain"))
52 return DIFF_PLAIN;
53 if (!strcasecmp(var+ofs, "meta"))
54 return DIFF_METAINFO;
55 if (!strcasecmp(var+ofs, "frag"))
56 return DIFF_FRAGINFO;
57 if (!strcasecmp(var+ofs, "old"))
58 return DIFF_FILE_OLD;
59 if (!strcasecmp(var+ofs, "new"))
60 return DIFF_FILE_NEW;
61 if (!strcasecmp(var+ofs, "commit"))
62 return DIFF_COMMIT;
63 if (!strcasecmp(var+ofs, "whitespace"))
64 return DIFF_WHITESPACE;
65 if (!strcasecmp(var+ofs, "func"))
66 return DIFF_FUNCINFO;
67 return -1;
68 }
69
70 static int parse_dirstat_params(struct diff_options *options, const char *params,
71 struct strbuf *errmsg)
72 {
73 const char *p = params;
74 int p_len, ret = 0;
75
76 while (*p) {
77 p_len = strchrnul(p, ',') - p;
78 if (!memcmp(p, "changes", p_len)) {
79 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
80 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
81 } else if (!memcmp(p, "lines", p_len)) {
82 DIFF_OPT_SET(options, DIRSTAT_BY_LINE);
83 DIFF_OPT_CLR(options, DIRSTAT_BY_FILE);
84 } else if (!memcmp(p, "files", p_len)) {
85 DIFF_OPT_CLR(options, DIRSTAT_BY_LINE);
86 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
87 } else if (!memcmp(p, "noncumulative", p_len)) {
88 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
89 } else if (!memcmp(p, "cumulative", p_len)) {
90 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
91 } else if (isdigit(*p)) {
92 char *end;
93 int permille = strtoul(p, &end, 10) * 10;
94 if (*end == '.' && isdigit(*++end)) {
95 /* only use first digit */
96 permille += *end - '0';
97 /* .. and ignore any further digits */
98 while (isdigit(*++end))
99 ; /* nothing */
100 }
101 if (end - p == p_len)
102 options->dirstat_permille = permille;
103 else {
104 strbuf_addf(errmsg, _(" Failed to parse dirstat cut-off percentage '%.*s'\n"),
105 p_len, p);
106 ret++;
107 }
108 } else {
109 strbuf_addf(errmsg, _(" Unknown dirstat parameter '%.*s'\n"),
110 p_len, p);
111 ret++;
112 }
113
114 p += p_len;
115
116 if (*p)
117 p++; /* more parameters, swallow separator */
118 }
119 return ret;
120 }
121
122 static int git_config_rename(const char *var, const char *value)
123 {
124 if (!value)
125 return DIFF_DETECT_RENAME;
126 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
127 return DIFF_DETECT_COPY;
128 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
129 }
130
131 /*
132 * These are to give UI layer defaults.
133 * The core-level commands such as git-diff-files should
134 * never be affected by the setting of diff.renames
135 * the user happens to have in the configuration file.
136 */
137 int git_diff_ui_config(const char *var, const char *value, void *cb)
138 {
139 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
140 diff_use_color_default = git_config_colorbool(var, value);
141 return 0;
142 }
143 if (!strcmp(var, "diff.renames")) {
144 diff_detect_rename_default = git_config_rename(var, value);
145 return 0;
146 }
147 if (!strcmp(var, "diff.autorefreshindex")) {
148 diff_auto_refresh_index = git_config_bool(var, value);
149 return 0;
150 }
151 if (!strcmp(var, "diff.mnemonicprefix")) {
152 diff_mnemonic_prefix = git_config_bool(var, value);
153 return 0;
154 }
155 if (!strcmp(var, "diff.noprefix")) {
156 diff_no_prefix = git_config_bool(var, value);
157 return 0;
158 }
159 if (!strcmp(var, "diff.external"))
160 return git_config_string(&external_diff_cmd_cfg, var, value);
161 if (!strcmp(var, "diff.wordregex"))
162 return git_config_string(&diff_word_regex_cfg, var, value);
163
164 if (!strcmp(var, "diff.ignoresubmodules"))
165 handle_ignore_submodules_arg(&default_diff_options, value);
166
167 if (git_color_config(var, value, cb) < 0)
168 return -1;
169
170 return git_diff_basic_config(var, value, cb);
171 }
172
173 int git_diff_basic_config(const char *var, const char *value, void *cb)
174 {
175 if (!strcmp(var, "diff.renamelimit")) {
176 diff_rename_limit_default = git_config_int(var, value);
177 return 0;
178 }
179
180 switch (userdiff_config(var, value)) {
181 case 0: break;
182 case -1: return -1;
183 default: return 0;
184 }
185
186 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
187 int slot = parse_diff_color_slot(var, 11);
188 if (slot < 0)
189 return 0;
190 if (!value)
191 return config_error_nonbool(var);
192 color_parse(value, var, diff_colors[slot]);
193 return 0;
194 }
195
196 /* like GNU diff's --suppress-blank-empty option */
197 if (!strcmp(var, "diff.suppressblankempty") ||
198 /* for backwards compatibility */
199 !strcmp(var, "diff.suppress-blank-empty")) {
200 diff_suppress_blank_empty = git_config_bool(var, value);
201 return 0;
202 }
203
204 if (!strcmp(var, "diff.dirstat")) {
205 struct strbuf errmsg = STRBUF_INIT;
206 default_diff_options.dirstat_permille = diff_dirstat_permille_default;
207 if (parse_dirstat_params(&default_diff_options, value, &errmsg))
208 warning(_("Found errors in 'diff.dirstat' config variable:\n%s"),
209 errmsg.buf);
210 strbuf_release(&errmsg);
211 diff_dirstat_permille_default = default_diff_options.dirstat_permille;
212 return 0;
213 }
214
215 if (!prefixcmp(var, "submodule."))
216 return parse_submodule_config_option(var, value);
217
218 return git_default_config(var, value, cb);
219 }
220
221 static char *quote_two(const char *one, const char *two)
222 {
223 int need_one = quote_c_style(one, NULL, NULL, 1);
224 int need_two = quote_c_style(two, NULL, NULL, 1);
225 struct strbuf res = STRBUF_INIT;
226
227 if (need_one + need_two) {
228 strbuf_addch(&res, '"');
229 quote_c_style(one, &res, NULL, 1);
230 quote_c_style(two, &res, NULL, 1);
231 strbuf_addch(&res, '"');
232 } else {
233 strbuf_addstr(&res, one);
234 strbuf_addstr(&res, two);
235 }
236 return strbuf_detach(&res, NULL);
237 }
238
239 static const char *external_diff(void)
240 {
241 static const char *external_diff_cmd = NULL;
242 static int done_preparing = 0;
243
244 if (done_preparing)
245 return external_diff_cmd;
246 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
247 if (!external_diff_cmd)
248 external_diff_cmd = external_diff_cmd_cfg;
249 done_preparing = 1;
250 return external_diff_cmd;
251 }
252
253 static struct diff_tempfile {
254 const char *name; /* filename external diff should read from */
255 char hex[41];
256 char mode[10];
257 char tmp_path[PATH_MAX];
258 } diff_temp[2];
259
260 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
261
262 struct emit_callback {
263 int color_diff;
264 unsigned ws_rule;
265 int blank_at_eof_in_preimage;
266 int blank_at_eof_in_postimage;
267 int lno_in_preimage;
268 int lno_in_postimage;
269 sane_truncate_fn truncate;
270 const char **label_path;
271 struct diff_words_data *diff_words;
272 struct diff_options *opt;
273 int *found_changesp;
274 struct strbuf *header;
275 };
276
277 static int count_lines(const char *data, int size)
278 {
279 int count, ch, completely_empty = 1, nl_just_seen = 0;
280 count = 0;
281 while (0 < size--) {
282 ch = *data++;
283 if (ch == '\n') {
284 count++;
285 nl_just_seen = 1;
286 completely_empty = 0;
287 }
288 else {
289 nl_just_seen = 0;
290 completely_empty = 0;
291 }
292 }
293 if (completely_empty)
294 return 0;
295 if (!nl_just_seen)
296 count++; /* no trailing newline */
297 return count;
298 }
299
300 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
301 {
302 if (!DIFF_FILE_VALID(one)) {
303 mf->ptr = (char *)""; /* does not matter */
304 mf->size = 0;
305 return 0;
306 }
307 else if (diff_populate_filespec(one, 0))
308 return -1;
309
310 mf->ptr = one->data;
311 mf->size = one->size;
312 return 0;
313 }
314
315 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
316 static unsigned long diff_filespec_size(struct diff_filespec *one)
317 {
318 if (!DIFF_FILE_VALID(one))
319 return 0;
320 diff_populate_filespec(one, 1);
321 return one->size;
322 }
323
324 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
325 {
326 char *ptr = mf->ptr;
327 long size = mf->size;
328 int cnt = 0;
329
330 if (!size)
331 return cnt;
332 ptr += size - 1; /* pointing at the very end */
333 if (*ptr != '\n')
334 ; /* incomplete line */
335 else
336 ptr--; /* skip the last LF */
337 while (mf->ptr < ptr) {
338 char *prev_eol;
339 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
340 if (*prev_eol == '\n')
341 break;
342 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
343 break;
344 cnt++;
345 ptr = prev_eol - 1;
346 }
347 return cnt;
348 }
349
350 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
351 struct emit_callback *ecbdata)
352 {
353 int l1, l2, at;
354 unsigned ws_rule = ecbdata->ws_rule;
355 l1 = count_trailing_blank(mf1, ws_rule);
356 l2 = count_trailing_blank(mf2, ws_rule);
357 if (l2 <= l1) {
358 ecbdata->blank_at_eof_in_preimage = 0;
359 ecbdata->blank_at_eof_in_postimage = 0;
360 return;
361 }
362 at = count_lines(mf1->ptr, mf1->size);
363 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
364
365 at = count_lines(mf2->ptr, mf2->size);
366 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
367 }
368
369 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
370 int first, const char *line, int len)
371 {
372 int has_trailing_newline, has_trailing_carriage_return;
373 int nofirst;
374 FILE *file = o->file;
375
376 if (o->output_prefix) {
377 struct strbuf *msg = NULL;
378 msg = o->output_prefix(o, o->output_prefix_data);
379 assert(msg);
380 fwrite(msg->buf, msg->len, 1, file);
381 }
382
383 if (len == 0) {
384 has_trailing_newline = (first == '\n');
385 has_trailing_carriage_return = (!has_trailing_newline &&
386 (first == '\r'));
387 nofirst = has_trailing_newline || has_trailing_carriage_return;
388 } else {
389 has_trailing_newline = (len > 0 && line[len-1] == '\n');
390 if (has_trailing_newline)
391 len--;
392 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
393 if (has_trailing_carriage_return)
394 len--;
395 nofirst = 0;
396 }
397
398 if (len || !nofirst) {
399 fputs(set, file);
400 if (!nofirst)
401 fputc(first, file);
402 fwrite(line, len, 1, file);
403 fputs(reset, file);
404 }
405 if (has_trailing_carriage_return)
406 fputc('\r', file);
407 if (has_trailing_newline)
408 fputc('\n', file);
409 }
410
411 static void emit_line(struct diff_options *o, const char *set, const char *reset,
412 const char *line, int len)
413 {
414 emit_line_0(o, set, reset, line[0], line+1, len-1);
415 }
416
417 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
418 {
419 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
420 ecbdata->blank_at_eof_in_preimage &&
421 ecbdata->blank_at_eof_in_postimage &&
422 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
423 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
424 return 0;
425 return ws_blank_line(line, len, ecbdata->ws_rule);
426 }
427
428 static void emit_add_line(const char *reset,
429 struct emit_callback *ecbdata,
430 const char *line, int len)
431 {
432 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
433 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
434
435 if (!*ws)
436 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
437 else if (new_blank_line_at_eof(ecbdata, line, len))
438 /* Blank line at EOF - paint '+' as well */
439 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
440 else {
441 /* Emit just the prefix, then the rest. */
442 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
443 ws_check_emit(line, len, ecbdata->ws_rule,
444 ecbdata->opt->file, set, reset, ws);
445 }
446 }
447
448 static void emit_hunk_header(struct emit_callback *ecbdata,
449 const char *line, int len)
450 {
451 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
452 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
453 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
454 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
455 static const char atat[2] = { '@', '@' };
456 const char *cp, *ep;
457 struct strbuf msgbuf = STRBUF_INIT;
458 int org_len = len;
459 int i = 1;
460
461 /*
462 * As a hunk header must begin with "@@ -<old>, +<new> @@",
463 * it always is at least 10 bytes long.
464 */
465 if (len < 10 ||
466 memcmp(line, atat, 2) ||
467 !(ep = memmem(line + 2, len - 2, atat, 2))) {
468 emit_line(ecbdata->opt, plain, reset, line, len);
469 return;
470 }
471 ep += 2; /* skip over @@ */
472
473 /* The hunk header in fraginfo color */
474 strbuf_add(&msgbuf, frag, strlen(frag));
475 strbuf_add(&msgbuf, line, ep - line);
476 strbuf_add(&msgbuf, reset, strlen(reset));
477
478 /*
479 * trailing "\r\n"
480 */
481 for ( ; i < 3; i++)
482 if (line[len - i] == '\r' || line[len - i] == '\n')
483 len--;
484
485 /* blank before the func header */
486 for (cp = ep; ep - line < len; ep++)
487 if (*ep != ' ' && *ep != '\t')
488 break;
489 if (ep != cp) {
490 strbuf_add(&msgbuf, plain, strlen(plain));
491 strbuf_add(&msgbuf, cp, ep - cp);
492 strbuf_add(&msgbuf, reset, strlen(reset));
493 }
494
495 if (ep < line + len) {
496 strbuf_add(&msgbuf, func, strlen(func));
497 strbuf_add(&msgbuf, ep, line + len - ep);
498 strbuf_add(&msgbuf, reset, strlen(reset));
499 }
500
501 strbuf_add(&msgbuf, line + len, org_len - len);
502 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
503 strbuf_release(&msgbuf);
504 }
505
506 static struct diff_tempfile *claim_diff_tempfile(void) {
507 int i;
508 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
509 if (!diff_temp[i].name)
510 return diff_temp + i;
511 die("BUG: diff is failing to clean up its tempfiles");
512 }
513
514 static int remove_tempfile_installed;
515
516 static void remove_tempfile(void)
517 {
518 int i;
519 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
520 if (diff_temp[i].name == diff_temp[i].tmp_path)
521 unlink_or_warn(diff_temp[i].name);
522 diff_temp[i].name = NULL;
523 }
524 }
525
526 static void remove_tempfile_on_signal(int signo)
527 {
528 remove_tempfile();
529 sigchain_pop(signo);
530 raise(signo);
531 }
532
533 static void print_line_count(FILE *file, int count)
534 {
535 switch (count) {
536 case 0:
537 fprintf(file, "0,0");
538 break;
539 case 1:
540 fprintf(file, "1");
541 break;
542 default:
543 fprintf(file, "1,%d", count);
544 break;
545 }
546 }
547
548 static void emit_rewrite_lines(struct emit_callback *ecb,
549 int prefix, const char *data, int size)
550 {
551 const char *endp = NULL;
552 static const char *nneof = " No newline at end of file\n";
553 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
554 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
555
556 while (0 < size) {
557 int len;
558
559 endp = memchr(data, '\n', size);
560 len = endp ? (endp - data + 1) : size;
561 if (prefix != '+') {
562 ecb->lno_in_preimage++;
563 emit_line_0(ecb->opt, old, reset, '-',
564 data, len);
565 } else {
566 ecb->lno_in_postimage++;
567 emit_add_line(reset, ecb, data, len);
568 }
569 size -= len;
570 data += len;
571 }
572 if (!endp) {
573 const char *plain = diff_get_color(ecb->color_diff,
574 DIFF_PLAIN);
575 emit_line_0(ecb->opt, plain, reset, '\\',
576 nneof, strlen(nneof));
577 }
578 }
579
580 static void emit_rewrite_diff(const char *name_a,
581 const char *name_b,
582 struct diff_filespec *one,
583 struct diff_filespec *two,
584 struct userdiff_driver *textconv_one,
585 struct userdiff_driver *textconv_two,
586 struct diff_options *o)
587 {
588 int lc_a, lc_b;
589 const char *name_a_tab, *name_b_tab;
590 const char *metainfo = diff_get_color(o->use_color, DIFF_METAINFO);
591 const char *fraginfo = diff_get_color(o->use_color, DIFF_FRAGINFO);
592 const char *reset = diff_get_color(o->use_color, DIFF_RESET);
593 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
594 const char *a_prefix, *b_prefix;
595 char *data_one, *data_two;
596 size_t size_one, size_two;
597 struct emit_callback ecbdata;
598 char *line_prefix = "";
599 struct strbuf *msgbuf;
600
601 if (o && o->output_prefix) {
602 msgbuf = o->output_prefix(o, o->output_prefix_data);
603 line_prefix = msgbuf->buf;
604 }
605
606 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
607 a_prefix = o->b_prefix;
608 b_prefix = o->a_prefix;
609 } else {
610 a_prefix = o->a_prefix;
611 b_prefix = o->b_prefix;
612 }
613
614 name_a += (*name_a == '/');
615 name_b += (*name_b == '/');
616 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
617 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
618
619 strbuf_reset(&a_name);
620 strbuf_reset(&b_name);
621 quote_two_c_style(&a_name, a_prefix, name_a, 0);
622 quote_two_c_style(&b_name, b_prefix, name_b, 0);
623
624 size_one = fill_textconv(textconv_one, one, &data_one);
625 size_two = fill_textconv(textconv_two, two, &data_two);
626
627 memset(&ecbdata, 0, sizeof(ecbdata));
628 ecbdata.color_diff = want_color(o->use_color);
629 ecbdata.found_changesp = &o->found_changes;
630 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
631 ecbdata.opt = o;
632 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
633 mmfile_t mf1, mf2;
634 mf1.ptr = (char *)data_one;
635 mf2.ptr = (char *)data_two;
636 mf1.size = size_one;
637 mf2.size = size_two;
638 check_blank_at_eof(&mf1, &mf2, &ecbdata);
639 }
640 ecbdata.lno_in_preimage = 1;
641 ecbdata.lno_in_postimage = 1;
642
643 lc_a = count_lines(data_one, size_one);
644 lc_b = count_lines(data_two, size_two);
645 fprintf(o->file,
646 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
647 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
648 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
649 line_prefix, fraginfo);
650 if (!o->irreversible_delete)
651 print_line_count(o->file, lc_a);
652 else
653 fprintf(o->file, "?,?");
654 fprintf(o->file, " +");
655 print_line_count(o->file, lc_b);
656 fprintf(o->file, " @@%s\n", reset);
657 if (lc_a && !o->irreversible_delete)
658 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
659 if (lc_b)
660 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
661 if (textconv_one)
662 free((char *)data_one);
663 if (textconv_two)
664 free((char *)data_two);
665 }
666
667 struct diff_words_buffer {
668 mmfile_t text;
669 long alloc;
670 struct diff_words_orig {
671 const char *begin, *end;
672 } *orig;
673 int orig_nr, orig_alloc;
674 };
675
676 static void diff_words_append(char *line, unsigned long len,
677 struct diff_words_buffer *buffer)
678 {
679 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
680 line++;
681 len--;
682 memcpy(buffer->text.ptr + buffer->text.size, line, len);
683 buffer->text.size += len;
684 buffer->text.ptr[buffer->text.size] = '\0';
685 }
686
687 struct diff_words_style_elem {
688 const char *prefix;
689 const char *suffix;
690 const char *color; /* NULL; filled in by the setup code if
691 * color is enabled */
692 };
693
694 struct diff_words_style {
695 enum diff_words_type type;
696 struct diff_words_style_elem new, old, ctx;
697 const char *newline;
698 };
699
700 static struct diff_words_style diff_words_styles[] = {
701 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
702 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
703 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
704 };
705
706 struct diff_words_data {
707 struct diff_words_buffer minus, plus;
708 const char *current_plus;
709 int last_minus;
710 struct diff_options *opt;
711 regex_t *word_regex;
712 enum diff_words_type type;
713 struct diff_words_style *style;
714 };
715
716 static int fn_out_diff_words_write_helper(FILE *fp,
717 struct diff_words_style_elem *st_el,
718 const char *newline,
719 size_t count, const char *buf,
720 const char *line_prefix)
721 {
722 int print = 0;
723
724 while (count) {
725 char *p = memchr(buf, '\n', count);
726 if (print)
727 fputs(line_prefix, fp);
728 if (p != buf) {
729 if (st_el->color && fputs(st_el->color, fp) < 0)
730 return -1;
731 if (fputs(st_el->prefix, fp) < 0 ||
732 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
733 fputs(st_el->suffix, fp) < 0)
734 return -1;
735 if (st_el->color && *st_el->color
736 && fputs(GIT_COLOR_RESET, fp) < 0)
737 return -1;
738 }
739 if (!p)
740 return 0;
741 if (fputs(newline, fp) < 0)
742 return -1;
743 count -= p + 1 - buf;
744 buf = p + 1;
745 print = 1;
746 }
747 return 0;
748 }
749
750 /*
751 * '--color-words' algorithm can be described as:
752 *
753 * 1. collect a the minus/plus lines of a diff hunk, divided into
754 * minus-lines and plus-lines;
755 *
756 * 2. break both minus-lines and plus-lines into words and
757 * place them into two mmfile_t with one word for each line;
758 *
759 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
760 *
761 * And for the common parts of the both file, we output the plus side text.
762 * diff_words->current_plus is used to trace the current position of the plus file
763 * which printed. diff_words->last_minus is used to trace the last minus word
764 * printed.
765 *
766 * For '--graph' to work with '--color-words', we need to output the graph prefix
767 * on each line of color words output. Generally, there are two conditions on
768 * which we should output the prefix.
769 *
770 * 1. diff_words->last_minus == 0 &&
771 * diff_words->current_plus == diff_words->plus.text.ptr
772 *
773 * that is: the plus text must start as a new line, and if there is no minus
774 * word printed, a graph prefix must be printed.
775 *
776 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
777 * *(diff_words->current_plus - 1) == '\n'
778 *
779 * that is: a graph prefix must be printed following a '\n'
780 */
781 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
782 {
783 if ((diff_words->last_minus == 0 &&
784 diff_words->current_plus == diff_words->plus.text.ptr) ||
785 (diff_words->current_plus > diff_words->plus.text.ptr &&
786 *(diff_words->current_plus - 1) == '\n')) {
787 return 1;
788 } else {
789 return 0;
790 }
791 }
792
793 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
794 {
795 struct diff_words_data *diff_words = priv;
796 struct diff_words_style *style = diff_words->style;
797 int minus_first, minus_len, plus_first, plus_len;
798 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
799 struct diff_options *opt = diff_words->opt;
800 struct strbuf *msgbuf;
801 char *line_prefix = "";
802
803 if (line[0] != '@' || parse_hunk_header(line, len,
804 &minus_first, &minus_len, &plus_first, &plus_len))
805 return;
806
807 assert(opt);
808 if (opt->output_prefix) {
809 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
810 line_prefix = msgbuf->buf;
811 }
812
813 /* POSIX requires that first be decremented by one if len == 0... */
814 if (minus_len) {
815 minus_begin = diff_words->minus.orig[minus_first].begin;
816 minus_end =
817 diff_words->minus.orig[minus_first + minus_len - 1].end;
818 } else
819 minus_begin = minus_end =
820 diff_words->minus.orig[minus_first].end;
821
822 if (plus_len) {
823 plus_begin = diff_words->plus.orig[plus_first].begin;
824 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
825 } else
826 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
827
828 if (color_words_output_graph_prefix(diff_words)) {
829 fputs(line_prefix, diff_words->opt->file);
830 }
831 if (diff_words->current_plus != plus_begin) {
832 fn_out_diff_words_write_helper(diff_words->opt->file,
833 &style->ctx, style->newline,
834 plus_begin - diff_words->current_plus,
835 diff_words->current_plus, line_prefix);
836 if (*(plus_begin - 1) == '\n')
837 fputs(line_prefix, diff_words->opt->file);
838 }
839 if (minus_begin != minus_end) {
840 fn_out_diff_words_write_helper(diff_words->opt->file,
841 &style->old, style->newline,
842 minus_end - minus_begin, minus_begin,
843 line_prefix);
844 }
845 if (plus_begin != plus_end) {
846 fn_out_diff_words_write_helper(diff_words->opt->file,
847 &style->new, style->newline,
848 plus_end - plus_begin, plus_begin,
849 line_prefix);
850 }
851
852 diff_words->current_plus = plus_end;
853 diff_words->last_minus = minus_first;
854 }
855
856 /* This function starts looking at *begin, and returns 0 iff a word was found. */
857 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
858 int *begin, int *end)
859 {
860 if (word_regex && *begin < buffer->size) {
861 regmatch_t match[1];
862 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
863 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
864 '\n', match[0].rm_eo - match[0].rm_so);
865 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
866 *begin += match[0].rm_so;
867 return *begin >= *end;
868 }
869 return -1;
870 }
871
872 /* find the next word */
873 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
874 (*begin)++;
875 if (*begin >= buffer->size)
876 return -1;
877
878 /* find the end of the word */
879 *end = *begin + 1;
880 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
881 (*end)++;
882
883 return 0;
884 }
885
886 /*
887 * This function splits the words in buffer->text, stores the list with
888 * newline separator into out, and saves the offsets of the original words
889 * in buffer->orig.
890 */
891 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
892 regex_t *word_regex)
893 {
894 int i, j;
895 long alloc = 0;
896
897 out->size = 0;
898 out->ptr = NULL;
899
900 /* fake an empty "0th" word */
901 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
902 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
903 buffer->orig_nr = 1;
904
905 for (i = 0; i < buffer->text.size; i++) {
906 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
907 return;
908
909 /* store original boundaries */
910 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
911 buffer->orig_alloc);
912 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
913 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
914 buffer->orig_nr++;
915
916 /* store one word */
917 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
918 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
919 out->ptr[out->size + j - i] = '\n';
920 out->size += j - i + 1;
921
922 i = j - 1;
923 }
924 }
925
926 /* this executes the word diff on the accumulated buffers */
927 static void diff_words_show(struct diff_words_data *diff_words)
928 {
929 xpparam_t xpp;
930 xdemitconf_t xecfg;
931 mmfile_t minus, plus;
932 struct diff_words_style *style = diff_words->style;
933
934 struct diff_options *opt = diff_words->opt;
935 struct strbuf *msgbuf;
936 char *line_prefix = "";
937
938 assert(opt);
939 if (opt->output_prefix) {
940 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
941 line_prefix = msgbuf->buf;
942 }
943
944 /* special case: only removal */
945 if (!diff_words->plus.text.size) {
946 fputs(line_prefix, diff_words->opt->file);
947 fn_out_diff_words_write_helper(diff_words->opt->file,
948 &style->old, style->newline,
949 diff_words->minus.text.size,
950 diff_words->minus.text.ptr, line_prefix);
951 diff_words->minus.text.size = 0;
952 return;
953 }
954
955 diff_words->current_plus = diff_words->plus.text.ptr;
956 diff_words->last_minus = 0;
957
958 memset(&xpp, 0, sizeof(xpp));
959 memset(&xecfg, 0, sizeof(xecfg));
960 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
961 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
962 xpp.flags = 0;
963 /* as only the hunk header will be parsed, we need a 0-context */
964 xecfg.ctxlen = 0;
965 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
966 &xpp, &xecfg);
967 free(minus.ptr);
968 free(plus.ptr);
969 if (diff_words->current_plus != diff_words->plus.text.ptr +
970 diff_words->plus.text.size) {
971 if (color_words_output_graph_prefix(diff_words))
972 fputs(line_prefix, diff_words->opt->file);
973 fn_out_diff_words_write_helper(diff_words->opt->file,
974 &style->ctx, style->newline,
975 diff_words->plus.text.ptr + diff_words->plus.text.size
976 - diff_words->current_plus, diff_words->current_plus,
977 line_prefix);
978 }
979 diff_words->minus.text.size = diff_words->plus.text.size = 0;
980 }
981
982 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
983 static void diff_words_flush(struct emit_callback *ecbdata)
984 {
985 if (ecbdata->diff_words->minus.text.size ||
986 ecbdata->diff_words->plus.text.size)
987 diff_words_show(ecbdata->diff_words);
988 }
989
990 static void free_diff_words_data(struct emit_callback *ecbdata)
991 {
992 if (ecbdata->diff_words) {
993 diff_words_flush(ecbdata);
994 free (ecbdata->diff_words->minus.text.ptr);
995 free (ecbdata->diff_words->minus.orig);
996 free (ecbdata->diff_words->plus.text.ptr);
997 free (ecbdata->diff_words->plus.orig);
998 if (ecbdata->diff_words->word_regex) {
999 regfree(ecbdata->diff_words->word_regex);
1000 free(ecbdata->diff_words->word_regex);
1001 }
1002 free(ecbdata->diff_words);
1003 ecbdata->diff_words = NULL;
1004 }
1005 }
1006
1007 const char *diff_get_color(int diff_use_color, enum color_diff ix)
1008 {
1009 if (want_color(diff_use_color))
1010 return diff_colors[ix];
1011 return "";
1012 }
1013
1014 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
1015 {
1016 const char *cp;
1017 unsigned long allot;
1018 size_t l = len;
1019
1020 if (ecb->truncate)
1021 return ecb->truncate(line, len);
1022 cp = line;
1023 allot = l;
1024 while (0 < l) {
1025 (void) utf8_width(&cp, &l);
1026 if (!cp)
1027 break; /* truncated in the middle? */
1028 }
1029 return allot - l;
1030 }
1031
1032 static void find_lno(const char *line, struct emit_callback *ecbdata)
1033 {
1034 const char *p;
1035 ecbdata->lno_in_preimage = 0;
1036 ecbdata->lno_in_postimage = 0;
1037 p = strchr(line, '-');
1038 if (!p)
1039 return; /* cannot happen */
1040 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
1041 p = strchr(p, '+');
1042 if (!p)
1043 return; /* cannot happen */
1044 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
1045 }
1046
1047 static void fn_out_consume(void *priv, char *line, unsigned long len)
1048 {
1049 struct emit_callback *ecbdata = priv;
1050 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
1051 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
1052 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
1053 struct diff_options *o = ecbdata->opt;
1054 char *line_prefix = "";
1055 struct strbuf *msgbuf;
1056
1057 if (o && o->output_prefix) {
1058 msgbuf = o->output_prefix(o, o->output_prefix_data);
1059 line_prefix = msgbuf->buf;
1060 }
1061
1062 if (ecbdata->header) {
1063 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
1064 strbuf_reset(ecbdata->header);
1065 ecbdata->header = NULL;
1066 }
1067 *(ecbdata->found_changesp) = 1;
1068
1069 if (ecbdata->label_path[0]) {
1070 const char *name_a_tab, *name_b_tab;
1071
1072 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1073 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1074
1075 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1076 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1077 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1078 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1079 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1080 }
1081
1082 if (diff_suppress_blank_empty
1083 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1084 line[0] = '\n';
1085 len = 1;
1086 }
1087
1088 if (line[0] == '@') {
1089 if (ecbdata->diff_words)
1090 diff_words_flush(ecbdata);
1091 len = sane_truncate_line(ecbdata, line, len);
1092 find_lno(line, ecbdata);
1093 emit_hunk_header(ecbdata, line, len);
1094 if (line[len-1] != '\n')
1095 putc('\n', ecbdata->opt->file);
1096 return;
1097 }
1098
1099 if (len < 1) {
1100 emit_line(ecbdata->opt, reset, reset, line, len);
1101 if (ecbdata->diff_words
1102 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1103 fputs("~\n", ecbdata->opt->file);
1104 return;
1105 }
1106
1107 if (ecbdata->diff_words) {
1108 if (line[0] == '-') {
1109 diff_words_append(line, len,
1110 &ecbdata->diff_words->minus);
1111 return;
1112 } else if (line[0] == '+') {
1113 diff_words_append(line, len,
1114 &ecbdata->diff_words->plus);
1115 return;
1116 } else if (!prefixcmp(line, "\\ ")) {
1117 /*
1118 * Eat the "no newline at eof" marker as if we
1119 * saw a "+" or "-" line with nothing on it,
1120 * and return without diff_words_flush() to
1121 * defer processing. If this is the end of
1122 * preimage, more "+" lines may come after it.
1123 */
1124 return;
1125 }
1126 diff_words_flush(ecbdata);
1127 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1128 emit_line(ecbdata->opt, plain, reset, line, len);
1129 fputs("~\n", ecbdata->opt->file);
1130 } else {
1131 /*
1132 * Skip the prefix character, if any. With
1133 * diff_suppress_blank_empty, there may be
1134 * none.
1135 */
1136 if (line[0] != '\n') {
1137 line++;
1138 len--;
1139 }
1140 emit_line(ecbdata->opt, plain, reset, line, len);
1141 }
1142 return;
1143 }
1144
1145 if (line[0] != '+') {
1146 const char *color =
1147 diff_get_color(ecbdata->color_diff,
1148 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1149 ecbdata->lno_in_preimage++;
1150 if (line[0] == ' ')
1151 ecbdata->lno_in_postimage++;
1152 emit_line(ecbdata->opt, color, reset, line, len);
1153 } else {
1154 ecbdata->lno_in_postimage++;
1155 emit_add_line(reset, ecbdata, line + 1, len - 1);
1156 }
1157 }
1158
1159 static char *pprint_rename(const char *a, const char *b)
1160 {
1161 const char *old = a;
1162 const char *new = b;
1163 struct strbuf name = STRBUF_INIT;
1164 int pfx_length, sfx_length;
1165 int len_a = strlen(a);
1166 int len_b = strlen(b);
1167 int a_midlen, b_midlen;
1168 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1169 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1170
1171 if (qlen_a || qlen_b) {
1172 quote_c_style(a, &name, NULL, 0);
1173 strbuf_addstr(&name, " => ");
1174 quote_c_style(b, &name, NULL, 0);
1175 return strbuf_detach(&name, NULL);
1176 }
1177
1178 /* Find common prefix */
1179 pfx_length = 0;
1180 while (*old && *new && *old == *new) {
1181 if (*old == '/')
1182 pfx_length = old - a + 1;
1183 old++;
1184 new++;
1185 }
1186
1187 /* Find common suffix */
1188 old = a + len_a;
1189 new = b + len_b;
1190 sfx_length = 0;
1191 while (a <= old && b <= new && *old == *new) {
1192 if (*old == '/')
1193 sfx_length = len_a - (old - a);
1194 old--;
1195 new--;
1196 }
1197
1198 /*
1199 * pfx{mid-a => mid-b}sfx
1200 * {pfx-a => pfx-b}sfx
1201 * pfx{sfx-a => sfx-b}
1202 * name-a => name-b
1203 */
1204 a_midlen = len_a - pfx_length - sfx_length;
1205 b_midlen = len_b - pfx_length - sfx_length;
1206 if (a_midlen < 0)
1207 a_midlen = 0;
1208 if (b_midlen < 0)
1209 b_midlen = 0;
1210
1211 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1212 if (pfx_length + sfx_length) {
1213 strbuf_add(&name, a, pfx_length);
1214 strbuf_addch(&name, '{');
1215 }
1216 strbuf_add(&name, a + pfx_length, a_midlen);
1217 strbuf_addstr(&name, " => ");
1218 strbuf_add(&name, b + pfx_length, b_midlen);
1219 if (pfx_length + sfx_length) {
1220 strbuf_addch(&name, '}');
1221 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1222 }
1223 return strbuf_detach(&name, NULL);
1224 }
1225
1226 struct diffstat_t {
1227 int nr;
1228 int alloc;
1229 struct diffstat_file {
1230 char *from_name;
1231 char *name;
1232 char *print_name;
1233 unsigned is_unmerged:1;
1234 unsigned is_binary:1;
1235 unsigned is_renamed:1;
1236 uintmax_t added, deleted;
1237 } **files;
1238 };
1239
1240 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1241 const char *name_a,
1242 const char *name_b)
1243 {
1244 struct diffstat_file *x;
1245 x = xcalloc(sizeof (*x), 1);
1246 if (diffstat->nr == diffstat->alloc) {
1247 diffstat->alloc = alloc_nr(diffstat->alloc);
1248 diffstat->files = xrealloc(diffstat->files,
1249 diffstat->alloc * sizeof(x));
1250 }
1251 diffstat->files[diffstat->nr++] = x;
1252 if (name_b) {
1253 x->from_name = xstrdup(name_a);
1254 x->name = xstrdup(name_b);
1255 x->is_renamed = 1;
1256 }
1257 else {
1258 x->from_name = NULL;
1259 x->name = xstrdup(name_a);
1260 }
1261 return x;
1262 }
1263
1264 static void diffstat_consume(void *priv, char *line, unsigned long len)
1265 {
1266 struct diffstat_t *diffstat = priv;
1267 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1268
1269 if (line[0] == '+')
1270 x->added++;
1271 else if (line[0] == '-')
1272 x->deleted++;
1273 }
1274
1275 const char mime_boundary_leader[] = "------------";
1276
1277 static int scale_linear(int it, int width, int max_change)
1278 {
1279 if (!it)
1280 return 0;
1281 /*
1282 * make sure that at least one '-' or '+' is printed if
1283 * there is any change to this path. The easiest way is to
1284 * scale linearly as if the alloted width is one column shorter
1285 * than it is, and then add 1 to the result.
1286 */
1287 return 1 + (it * (width - 1) / max_change);
1288 }
1289
1290 static void show_name(FILE *file,
1291 const char *prefix, const char *name, int len)
1292 {
1293 fprintf(file, " %s%-*s |", prefix, len, name);
1294 }
1295
1296 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1297 {
1298 if (cnt <= 0)
1299 return;
1300 fprintf(file, "%s", set);
1301 while (cnt--)
1302 putc(ch, file);
1303 fprintf(file, "%s", reset);
1304 }
1305
1306 static void fill_print_name(struct diffstat_file *file)
1307 {
1308 char *pname;
1309
1310 if (file->print_name)
1311 return;
1312
1313 if (!file->is_renamed) {
1314 struct strbuf buf = STRBUF_INIT;
1315 if (quote_c_style(file->name, &buf, NULL, 0)) {
1316 pname = strbuf_detach(&buf, NULL);
1317 } else {
1318 pname = file->name;
1319 strbuf_release(&buf);
1320 }
1321 } else {
1322 pname = pprint_rename(file->from_name, file->name);
1323 }
1324 file->print_name = pname;
1325 }
1326
1327 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1328 {
1329 int i, len, add, del, adds = 0, dels = 0;
1330 uintmax_t max_change = 0, max_len = 0;
1331 int total_files = data->nr;
1332 int width, name_width, graph_width, number_width = 4, count;
1333 const char *reset, *add_c, *del_c;
1334 const char *line_prefix = "";
1335 int extra_shown = 0;
1336 struct strbuf *msg = NULL;
1337
1338 if (data->nr == 0)
1339 return;
1340
1341 if (options->output_prefix) {
1342 msg = options->output_prefix(options, options->output_prefix_data);
1343 line_prefix = msg->buf;
1344 }
1345
1346 count = options->stat_count ? options->stat_count : data->nr;
1347
1348 reset = diff_get_color_opt(options, DIFF_RESET);
1349 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1350 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1351
1352 /*
1353 * Find the longest filename and max number of changes
1354 */
1355 for (i = 0; (i < count) && (i < data->nr); i++) {
1356 struct diffstat_file *file = data->files[i];
1357 uintmax_t change = file->added + file->deleted;
1358 if (!data->files[i]->is_renamed &&
1359 (change == 0)) {
1360 count++; /* not shown == room for one more */
1361 continue;
1362 }
1363 fill_print_name(file);
1364 len = strlen(file->print_name);
1365 if (max_len < len)
1366 max_len = len;
1367
1368 if (file->is_binary || file->is_unmerged)
1369 continue;
1370 if (max_change < change)
1371 max_change = change;
1372 }
1373 count = i; /* min(count, data->nr) */
1374
1375 /*
1376 * We have width = stat_width or term_columns() columns total.
1377 * We want a maximum of min(max_len, stat_name_width) for the name part.
1378 * We want a maximum of min(max_change, stat_graph_width) for the +- part.
1379 * We also need 1 for " " and 4 + decimal_width(max_change)
1380 * for " | NNNN " and one the empty column at the end, altogether
1381 * 6 + decimal_width(max_change).
1382 *
1383 * If there's not enough space, we will use the smaller of
1384 * stat_name_width (if set) and 5/8*width for the filename,
1385 * and the rest for constant elements + graph part, but no more
1386 * than stat_graph_width for the graph part.
1387 * (5/8 gives 50 for filename and 30 for the constant parts + graph
1388 * for the standard terminal size).
1389 *
1390 * In other words: stat_width limits the maximum width, and
1391 * stat_name_width fixes the maximum width of the filename,
1392 * and is also used to divide available columns if there
1393 * aren't enough.
1394 */
1395
1396 if (options->stat_width == -1)
1397 width = term_columns();
1398 else
1399 width = options->stat_width ? options->stat_width : 80;
1400
1401 /*
1402 * Guarantee 3/8*16==6 for the graph part
1403 * and 5/8*16==10 for the filename part
1404 */
1405 if (width < 16 + 6 + number_width)
1406 width = 16 + 6 + number_width;
1407
1408 /*
1409 * First assign sizes that are wanted, ignoring available width.
1410 */
1411 graph_width = (options->stat_graph_width &&
1412 options->stat_graph_width < max_change) ?
1413 options->stat_graph_width : max_change;
1414 name_width = (options->stat_name_width > 0 &&
1415 options->stat_name_width < max_len) ?
1416 options->stat_name_width : max_len;
1417
1418 /*
1419 * Adjust adjustable widths not to exceed maximum width
1420 */
1421 if (name_width + number_width + 6 + graph_width > width) {
1422 if (graph_width > width * 3/8 - number_width - 6)
1423 graph_width = width * 3/8 - number_width - 6;
1424 if (options->stat_graph_width &&
1425 graph_width > options->stat_graph_width)
1426 graph_width = options->stat_graph_width;
1427 if (name_width > width - number_width - 6 - graph_width)
1428 name_width = width - number_width - 6 - graph_width;
1429 else
1430 graph_width = width - number_width - 6 - name_width;
1431 }
1432
1433 /*
1434 * From here name_width is the width of the name area,
1435 * and graph_width is the width of the graph area.
1436 * max_change is used to scale graph properly.
1437 */
1438 for (i = 0; i < count; i++) {
1439 const char *prefix = "";
1440 char *name = data->files[i]->print_name;
1441 uintmax_t added = data->files[i]->added;
1442 uintmax_t deleted = data->files[i]->deleted;
1443 int name_len;
1444
1445 if (!data->files[i]->is_renamed &&
1446 (added + deleted == 0)) {
1447 total_files--;
1448 continue;
1449 }
1450 /*
1451 * "scale" the filename
1452 */
1453 len = name_width;
1454 name_len = strlen(name);
1455 if (name_width < name_len) {
1456 char *slash;
1457 prefix = "...";
1458 len -= 3;
1459 name += name_len - len;
1460 slash = strchr(name, '/');
1461 if (slash)
1462 name = slash;
1463 }
1464
1465 if (data->files[i]->is_binary) {
1466 fprintf(options->file, "%s", line_prefix);
1467 show_name(options->file, prefix, name, len);
1468 fprintf(options->file, " Bin ");
1469 fprintf(options->file, "%s%"PRIuMAX"%s",
1470 del_c, deleted, reset);
1471 fprintf(options->file, " -> ");
1472 fprintf(options->file, "%s%"PRIuMAX"%s",
1473 add_c, added, reset);
1474 fprintf(options->file, " bytes");
1475 fprintf(options->file, "\n");
1476 continue;
1477 }
1478 else if (data->files[i]->is_unmerged) {
1479 fprintf(options->file, "%s", line_prefix);
1480 show_name(options->file, prefix, name, len);
1481 fprintf(options->file, " Unmerged\n");
1482 continue;
1483 }
1484
1485 /*
1486 * scale the add/delete
1487 */
1488 add = added;
1489 del = deleted;
1490 adds += add;
1491 dels += del;
1492
1493 if (graph_width <= max_change) {
1494 int total = add + del;
1495
1496 total = scale_linear(add + del, graph_width, max_change);
1497 if (total < 2 && add && del)
1498 /* width >= 2 due to the sanity check */
1499 total = 2;
1500 if (add < del) {
1501 add = scale_linear(add, graph_width, max_change);
1502 del = total - add;
1503 } else {
1504 del = scale_linear(del, graph_width, max_change);
1505 add = total - del;
1506 }
1507 }
1508 fprintf(options->file, "%s", line_prefix);
1509 show_name(options->file, prefix, name, len);
1510 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1511 added + deleted ? " " : "");
1512 show_graph(options->file, '+', add, add_c, reset);
1513 show_graph(options->file, '-', del, del_c, reset);
1514 fprintf(options->file, "\n");
1515 }
1516 for (i = count; i < data->nr; i++) {
1517 uintmax_t added = data->files[i]->added;
1518 uintmax_t deleted = data->files[i]->deleted;
1519 if (!data->files[i]->is_renamed &&
1520 (added + deleted == 0)) {
1521 total_files--;
1522 continue;
1523 }
1524 adds += added;
1525 dels += deleted;
1526 if (!extra_shown)
1527 fprintf(options->file, "%s ...\n", line_prefix);
1528 extra_shown = 1;
1529 }
1530 fprintf(options->file, "%s", line_prefix);
1531 fprintf(options->file,
1532 " %d files changed, %d insertions(+), %d deletions(-)\n",
1533 total_files, adds, dels);
1534 }
1535
1536 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1537 {
1538 int i, adds = 0, dels = 0, total_files = data->nr;
1539
1540 if (data->nr == 0)
1541 return;
1542
1543 for (i = 0; i < data->nr; i++) {
1544 if (!data->files[i]->is_binary &&
1545 !data->files[i]->is_unmerged) {
1546 int added = data->files[i]->added;
1547 int deleted= data->files[i]->deleted;
1548 if (!data->files[i]->is_renamed &&
1549 (added + deleted == 0)) {
1550 total_files--;
1551 } else {
1552 adds += added;
1553 dels += deleted;
1554 }
1555 }
1556 }
1557 if (options->output_prefix) {
1558 struct strbuf *msg = NULL;
1559 msg = options->output_prefix(options,
1560 options->output_prefix_data);
1561 fprintf(options->file, "%s", msg->buf);
1562 }
1563 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1564 total_files, adds, dels);
1565 }
1566
1567 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1568 {
1569 int i;
1570
1571 if (data->nr == 0)
1572 return;
1573
1574 for (i = 0; i < data->nr; i++) {
1575 struct diffstat_file *file = data->files[i];
1576
1577 if (options->output_prefix) {
1578 struct strbuf *msg = NULL;
1579 msg = options->output_prefix(options,
1580 options->output_prefix_data);
1581 fprintf(options->file, "%s", msg->buf);
1582 }
1583
1584 if (file->is_binary)
1585 fprintf(options->file, "-\t-\t");
1586 else
1587 fprintf(options->file,
1588 "%"PRIuMAX"\t%"PRIuMAX"\t",
1589 file->added, file->deleted);
1590 if (options->line_termination) {
1591 fill_print_name(file);
1592 if (!file->is_renamed)
1593 write_name_quoted(file->name, options->file,
1594 options->line_termination);
1595 else {
1596 fputs(file->print_name, options->file);
1597 putc(options->line_termination, options->file);
1598 }
1599 } else {
1600 if (file->is_renamed) {
1601 putc('\0', options->file);
1602 write_name_quoted(file->from_name, options->file, '\0');
1603 }
1604 write_name_quoted(file->name, options->file, '\0');
1605 }
1606 }
1607 }
1608
1609 struct dirstat_file {
1610 const char *name;
1611 unsigned long changed;
1612 };
1613
1614 struct dirstat_dir {
1615 struct dirstat_file *files;
1616 int alloc, nr, permille, cumulative;
1617 };
1618
1619 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1620 unsigned long changed, const char *base, int baselen)
1621 {
1622 unsigned long this_dir = 0;
1623 unsigned int sources = 0;
1624 const char *line_prefix = "";
1625 struct strbuf *msg = NULL;
1626
1627 if (opt->output_prefix) {
1628 msg = opt->output_prefix(opt, opt->output_prefix_data);
1629 line_prefix = msg->buf;
1630 }
1631
1632 while (dir->nr) {
1633 struct dirstat_file *f = dir->files;
1634 int namelen = strlen(f->name);
1635 unsigned long this;
1636 char *slash;
1637
1638 if (namelen < baselen)
1639 break;
1640 if (memcmp(f->name, base, baselen))
1641 break;
1642 slash = strchr(f->name + baselen, '/');
1643 if (slash) {
1644 int newbaselen = slash + 1 - f->name;
1645 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1646 sources++;
1647 } else {
1648 this = f->changed;
1649 dir->files++;
1650 dir->nr--;
1651 sources += 2;
1652 }
1653 this_dir += this;
1654 }
1655
1656 /*
1657 * We don't report dirstat's for
1658 * - the top level
1659 * - or cases where everything came from a single directory
1660 * under this directory (sources == 1).
1661 */
1662 if (baselen && sources != 1) {
1663 if (this_dir) {
1664 int permille = this_dir * 1000 / changed;
1665 if (permille >= dir->permille) {
1666 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1667 permille / 10, permille % 10, baselen, base);
1668 if (!dir->cumulative)
1669 return 0;
1670 }
1671 }
1672 }
1673 return this_dir;
1674 }
1675
1676 static int dirstat_compare(const void *_a, const void *_b)
1677 {
1678 const struct dirstat_file *a = _a;
1679 const struct dirstat_file *b = _b;
1680 return strcmp(a->name, b->name);
1681 }
1682
1683 static void show_dirstat(struct diff_options *options)
1684 {
1685 int i;
1686 unsigned long changed;
1687 struct dirstat_dir dir;
1688 struct diff_queue_struct *q = &diff_queued_diff;
1689
1690 dir.files = NULL;
1691 dir.alloc = 0;
1692 dir.nr = 0;
1693 dir.permille = options->dirstat_permille;
1694 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1695
1696 changed = 0;
1697 for (i = 0; i < q->nr; i++) {
1698 struct diff_filepair *p = q->queue[i];
1699 const char *name;
1700 unsigned long copied, added, damage;
1701 int content_changed;
1702
1703 name = p->two->path ? p->two->path : p->one->path;
1704
1705 if (p->one->sha1_valid && p->two->sha1_valid)
1706 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1707 else
1708 content_changed = 1;
1709
1710 if (!content_changed) {
1711 /*
1712 * The SHA1 has not changed, so pre-/post-content is
1713 * identical. We can therefore skip looking at the
1714 * file contents altogether.
1715 */
1716 damage = 0;
1717 goto found_damage;
1718 }
1719
1720 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1721 /*
1722 * In --dirstat-by-file mode, we don't really need to
1723 * look at the actual file contents at all.
1724 * The fact that the SHA1 changed is enough for us to
1725 * add this file to the list of results
1726 * (with each file contributing equal damage).
1727 */
1728 damage = 1;
1729 goto found_damage;
1730 }
1731
1732 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1733 diff_populate_filespec(p->one, 0);
1734 diff_populate_filespec(p->two, 0);
1735 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1736 &copied, &added);
1737 diff_free_filespec_data(p->one);
1738 diff_free_filespec_data(p->two);
1739 } else if (DIFF_FILE_VALID(p->one)) {
1740 diff_populate_filespec(p->one, 1);
1741 copied = added = 0;
1742 diff_free_filespec_data(p->one);
1743 } else if (DIFF_FILE_VALID(p->two)) {
1744 diff_populate_filespec(p->two, 1);
1745 copied = 0;
1746 added = p->two->size;
1747 diff_free_filespec_data(p->two);
1748 } else
1749 continue;
1750
1751 /*
1752 * Original minus copied is the removed material,
1753 * added is the new material. They are both damages
1754 * made to the preimage.
1755 * If the resulting damage is zero, we know that
1756 * diffcore_count_changes() considers the two entries to
1757 * be identical, but since content_changed is true, we
1758 * know that there must have been _some_ kind of change,
1759 * so we force all entries to have damage > 0.
1760 */
1761 damage = (p->one->size - copied) + added;
1762 if (!damage)
1763 damage = 1;
1764
1765 found_damage:
1766 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1767 dir.files[dir.nr].name = name;
1768 dir.files[dir.nr].changed = damage;
1769 changed += damage;
1770 dir.nr++;
1771 }
1772
1773 /* This can happen even with many files, if everything was renames */
1774 if (!changed)
1775 return;
1776
1777 /* Show all directories with more than x% of the changes */
1778 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1779 gather_dirstat(options, &dir, changed, "", 0);
1780 }
1781
1782 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
1783 {
1784 int i;
1785 unsigned long changed;
1786 struct dirstat_dir dir;
1787
1788 if (data->nr == 0)
1789 return;
1790
1791 dir.files = NULL;
1792 dir.alloc = 0;
1793 dir.nr = 0;
1794 dir.permille = options->dirstat_permille;
1795 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1796
1797 changed = 0;
1798 for (i = 0; i < data->nr; i++) {
1799 struct diffstat_file *file = data->files[i];
1800 unsigned long damage = file->added + file->deleted;
1801 if (file->is_binary)
1802 /*
1803 * binary files counts bytes, not lines. Must find some
1804 * way to normalize binary bytes vs. textual lines.
1805 * The following heuristic assumes that there are 64
1806 * bytes per "line".
1807 * This is stupid and ugly, but very cheap...
1808 */
1809 damage = (damage + 63) / 64;
1810 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1811 dir.files[dir.nr].name = file->name;
1812 dir.files[dir.nr].changed = damage;
1813 changed += damage;
1814 dir.nr++;
1815 }
1816
1817 /* This can happen even with many files, if everything was renames */
1818 if (!changed)
1819 return;
1820
1821 /* Show all directories with more than x% of the changes */
1822 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1823 gather_dirstat(options, &dir, changed, "", 0);
1824 }
1825
1826 static void free_diffstat_info(struct diffstat_t *diffstat)
1827 {
1828 int i;
1829 for (i = 0; i < diffstat->nr; i++) {
1830 struct diffstat_file *f = diffstat->files[i];
1831 if (f->name != f->print_name)
1832 free(f->print_name);
1833 free(f->name);
1834 free(f->from_name);
1835 free(f);
1836 }
1837 free(diffstat->files);
1838 }
1839
1840 struct checkdiff_t {
1841 const char *filename;
1842 int lineno;
1843 int conflict_marker_size;
1844 struct diff_options *o;
1845 unsigned ws_rule;
1846 unsigned status;
1847 };
1848
1849 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1850 {
1851 char firstchar;
1852 int cnt;
1853
1854 if (len < marker_size + 1)
1855 return 0;
1856 firstchar = line[0];
1857 switch (firstchar) {
1858 case '=': case '>': case '<': case '|':
1859 break;
1860 default:
1861 return 0;
1862 }
1863 for (cnt = 1; cnt < marker_size; cnt++)
1864 if (line[cnt] != firstchar)
1865 return 0;
1866 /* line[1] thru line[marker_size-1] are same as firstchar */
1867 if (len < marker_size + 1 || !isspace(line[marker_size]))
1868 return 0;
1869 return 1;
1870 }
1871
1872 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1873 {
1874 struct checkdiff_t *data = priv;
1875 int marker_size = data->conflict_marker_size;
1876 const char *ws = diff_get_color(data->o->use_color, DIFF_WHITESPACE);
1877 const char *reset = diff_get_color(data->o->use_color, DIFF_RESET);
1878 const char *set = diff_get_color(data->o->use_color, DIFF_FILE_NEW);
1879 char *err;
1880 char *line_prefix = "";
1881 struct strbuf *msgbuf;
1882
1883 assert(data->o);
1884 if (data->o->output_prefix) {
1885 msgbuf = data->o->output_prefix(data->o,
1886 data->o->output_prefix_data);
1887 line_prefix = msgbuf->buf;
1888 }
1889
1890 if (line[0] == '+') {
1891 unsigned bad;
1892 data->lineno++;
1893 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1894 data->status |= 1;
1895 fprintf(data->o->file,
1896 "%s%s:%d: leftover conflict marker\n",
1897 line_prefix, data->filename, data->lineno);
1898 }
1899 bad = ws_check(line + 1, len - 1, data->ws_rule);
1900 if (!bad)
1901 return;
1902 data->status |= bad;
1903 err = whitespace_error_string(bad);
1904 fprintf(data->o->file, "%s%s:%d: %s.\n",
1905 line_prefix, data->filename, data->lineno, err);
1906 free(err);
1907 emit_line(data->o, set, reset, line, 1);
1908 ws_check_emit(line + 1, len - 1, data->ws_rule,
1909 data->o->file, set, reset, ws);
1910 } else if (line[0] == ' ') {
1911 data->lineno++;
1912 } else if (line[0] == '@') {
1913 char *plus = strchr(line, '+');
1914 if (plus)
1915 data->lineno = strtol(plus, NULL, 10) - 1;
1916 else
1917 die("invalid diff");
1918 }
1919 }
1920
1921 static unsigned char *deflate_it(char *data,
1922 unsigned long size,
1923 unsigned long *result_size)
1924 {
1925 int bound;
1926 unsigned char *deflated;
1927 git_zstream stream;
1928
1929 memset(&stream, 0, sizeof(stream));
1930 git_deflate_init(&stream, zlib_compression_level);
1931 bound = git_deflate_bound(&stream, size);
1932 deflated = xmalloc(bound);
1933 stream.next_out = deflated;
1934 stream.avail_out = bound;
1935
1936 stream.next_in = (unsigned char *)data;
1937 stream.avail_in = size;
1938 while (git_deflate(&stream, Z_FINISH) == Z_OK)
1939 ; /* nothing */
1940 git_deflate_end(&stream);
1941 *result_size = stream.total_out;
1942 return deflated;
1943 }
1944
1945 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1946 {
1947 void *cp;
1948 void *delta;
1949 void *deflated;
1950 void *data;
1951 unsigned long orig_size;
1952 unsigned long delta_size;
1953 unsigned long deflate_size;
1954 unsigned long data_size;
1955
1956 /* We could do deflated delta, or we could do just deflated two,
1957 * whichever is smaller.
1958 */
1959 delta = NULL;
1960 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1961 if (one->size && two->size) {
1962 delta = diff_delta(one->ptr, one->size,
1963 two->ptr, two->size,
1964 &delta_size, deflate_size);
1965 if (delta) {
1966 void *to_free = delta;
1967 orig_size = delta_size;
1968 delta = deflate_it(delta, delta_size, &delta_size);
1969 free(to_free);
1970 }
1971 }
1972
1973 if (delta && delta_size < deflate_size) {
1974 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1975 free(deflated);
1976 data = delta;
1977 data_size = delta_size;
1978 }
1979 else {
1980 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1981 free(delta);
1982 data = deflated;
1983 data_size = deflate_size;
1984 }
1985
1986 /* emit data encoded in base85 */
1987 cp = data;
1988 while (data_size) {
1989 int bytes = (52 < data_size) ? 52 : data_size;
1990 char line[70];
1991 data_size -= bytes;
1992 if (bytes <= 26)
1993 line[0] = bytes + 'A' - 1;
1994 else
1995 line[0] = bytes - 26 + 'a' - 1;
1996 encode_85(line + 1, cp, bytes);
1997 cp = (char *) cp + bytes;
1998 fprintf(file, "%s", prefix);
1999 fputs(line, file);
2000 fputc('\n', file);
2001 }
2002 fprintf(file, "%s\n", prefix);
2003 free(data);
2004 }
2005
2006 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
2007 {
2008 fprintf(file, "%sGIT binary patch\n", prefix);
2009 emit_binary_diff_body(file, one, two, prefix);
2010 emit_binary_diff_body(file, two, one, prefix);
2011 }
2012
2013 static void diff_filespec_load_driver(struct diff_filespec *one)
2014 {
2015 /* Use already-loaded driver */
2016 if (one->driver)
2017 return;
2018
2019 if (S_ISREG(one->mode))
2020 one->driver = userdiff_find_by_path(one->path);
2021
2022 /* Fallback to default settings */
2023 if (!one->driver)
2024 one->driver = userdiff_find_by_name("default");
2025 }
2026
2027 int diff_filespec_is_binary(struct diff_filespec *one)
2028 {
2029 if (one->is_binary == -1) {
2030 diff_filespec_load_driver(one);
2031 if (one->driver->binary != -1)
2032 one->is_binary = one->driver->binary;
2033 else {
2034 if (!one->data && DIFF_FILE_VALID(one))
2035 diff_populate_filespec(one, 0);
2036 if (one->data)
2037 one->is_binary = buffer_is_binary(one->data,
2038 one->size);
2039 if (one->is_binary == -1)
2040 one->is_binary = 0;
2041 }
2042 }
2043 return one->is_binary;
2044 }
2045
2046 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
2047 {
2048 diff_filespec_load_driver(one);
2049 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
2050 }
2051
2052 static const char *userdiff_word_regex(struct diff_filespec *one)
2053 {
2054 diff_filespec_load_driver(one);
2055 return one->driver->word_regex;
2056 }
2057
2058 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
2059 {
2060 if (!options->a_prefix)
2061 options->a_prefix = a;
2062 if (!options->b_prefix)
2063 options->b_prefix = b;
2064 }
2065
2066 struct userdiff_driver *get_textconv(struct diff_filespec *one)
2067 {
2068 if (!DIFF_FILE_VALID(one))
2069 return NULL;
2070
2071 diff_filespec_load_driver(one);
2072 return userdiff_get_textconv(one->driver);
2073 }
2074
2075 static void builtin_diff(const char *name_a,
2076 const char *name_b,
2077 struct diff_filespec *one,
2078 struct diff_filespec *two,
2079 const char *xfrm_msg,
2080 int must_show_header,
2081 struct diff_options *o,
2082 int complete_rewrite)
2083 {
2084 mmfile_t mf1, mf2;
2085 const char *lbl[2];
2086 char *a_one, *b_two;
2087 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
2088 const char *reset = diff_get_color_opt(o, DIFF_RESET);
2089 const char *a_prefix, *b_prefix;
2090 struct userdiff_driver *textconv_one = NULL;
2091 struct userdiff_driver *textconv_two = NULL;
2092 struct strbuf header = STRBUF_INIT;
2093 struct strbuf *msgbuf;
2094 char *line_prefix = "";
2095
2096 if (o->output_prefix) {
2097 msgbuf = o->output_prefix(o, o->output_prefix_data);
2098 line_prefix = msgbuf->buf;
2099 }
2100
2101 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
2102 (!one->mode || S_ISGITLINK(one->mode)) &&
2103 (!two->mode || S_ISGITLINK(two->mode))) {
2104 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
2105 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
2106 show_submodule_summary(o->file, one ? one->path : two->path,
2107 one->sha1, two->sha1, two->dirty_submodule,
2108 del, add, reset);
2109 return;
2110 }
2111
2112 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
2113 textconv_one = get_textconv(one);
2114 textconv_two = get_textconv(two);
2115 }
2116
2117 diff_set_mnemonic_prefix(o, "a/", "b/");
2118 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
2119 a_prefix = o->b_prefix;
2120 b_prefix = o->a_prefix;
2121 } else {
2122 a_prefix = o->a_prefix;
2123 b_prefix = o->b_prefix;
2124 }
2125
2126 /* Never use a non-valid filename anywhere if at all possible */
2127 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
2128 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
2129
2130 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
2131 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
2132 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
2133 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
2134 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
2135 if (lbl[0][0] == '/') {
2136 /* /dev/null */
2137 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
2138 if (xfrm_msg)
2139 strbuf_addstr(&header, xfrm_msg);
2140 must_show_header = 1;
2141 }
2142 else if (lbl[1][0] == '/') {
2143 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
2144 if (xfrm_msg)
2145 strbuf_addstr(&header, xfrm_msg);
2146 must_show_header = 1;
2147 }
2148 else {
2149 if (one->mode != two->mode) {
2150 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
2151 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
2152 must_show_header = 1;
2153 }
2154 if (xfrm_msg)
2155 strbuf_addstr(&header, xfrm_msg);
2156
2157 /*
2158 * we do not run diff between different kind
2159 * of objects.
2160 */
2161 if ((one->mode ^ two->mode) & S_IFMT)
2162 goto free_ab_and_return;
2163 if (complete_rewrite &&
2164 (textconv_one || !diff_filespec_is_binary(one)) &&
2165 (textconv_two || !diff_filespec_is_binary(two))) {
2166 fprintf(o->file, "%s", header.buf);
2167 strbuf_reset(&header);
2168 emit_rewrite_diff(name_a, name_b, one, two,
2169 textconv_one, textconv_two, o);
2170 o->found_changes = 1;
2171 goto free_ab_and_return;
2172 }
2173 }
2174
2175 if (o->irreversible_delete && lbl[1][0] == '/') {
2176 fprintf(o->file, "%s", header.buf);
2177 strbuf_reset(&header);
2178 goto free_ab_and_return;
2179 } else if (!DIFF_OPT_TST(o, TEXT) &&
2180 ( (!textconv_one && diff_filespec_is_binary(one)) ||
2181 (!textconv_two && diff_filespec_is_binary(two)) )) {
2182 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2183 die("unable to read files to diff");
2184 /* Quite common confusing case */
2185 if (mf1.size == mf2.size &&
2186 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
2187 if (must_show_header)
2188 fprintf(o->file, "%s", header.buf);
2189 goto free_ab_and_return;
2190 }
2191 fprintf(o->file, "%s", header.buf);
2192 strbuf_reset(&header);
2193 if (DIFF_OPT_TST(o, BINARY))
2194 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2195 else
2196 fprintf(o->file, "%sBinary files %s and %s differ\n",
2197 line_prefix, lbl[0], lbl[1]);
2198 o->found_changes = 1;
2199 } else {
2200 /* Crazy xdl interfaces.. */
2201 const char *diffopts = getenv("GIT_DIFF_OPTS");
2202 xpparam_t xpp;
2203 xdemitconf_t xecfg;
2204 struct emit_callback ecbdata;
2205 const struct userdiff_funcname *pe;
2206
2207 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2208 fprintf(o->file, "%s", header.buf);
2209 strbuf_reset(&header);
2210 }
2211
2212 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2213 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2214
2215 pe = diff_funcname_pattern(one);
2216 if (!pe)
2217 pe = diff_funcname_pattern(two);
2218
2219 memset(&xpp, 0, sizeof(xpp));
2220 memset(&xecfg, 0, sizeof(xecfg));
2221 memset(&ecbdata, 0, sizeof(ecbdata));
2222 ecbdata.label_path = lbl;
2223 ecbdata.color_diff = want_color(o->use_color);
2224 ecbdata.found_changesp = &o->found_changes;
2225 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2226 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2227 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2228 ecbdata.opt = o;
2229 ecbdata.header = header.len ? &header : NULL;
2230 xpp.flags = o->xdl_opts;
2231 xecfg.ctxlen = o->context;
2232 xecfg.interhunkctxlen = o->interhunkcontext;
2233 xecfg.flags = XDL_EMIT_FUNCNAMES;
2234 if (DIFF_OPT_TST(o, FUNCCONTEXT))
2235 xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
2236 if (pe)
2237 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2238 if (!diffopts)
2239 ;
2240 else if (!prefixcmp(diffopts, "--unified="))
2241 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2242 else if (!prefixcmp(diffopts, "-u"))
2243 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2244 if (o->word_diff) {
2245 int i;
2246
2247 ecbdata.diff_words =
2248 xcalloc(1, sizeof(struct diff_words_data));
2249 ecbdata.diff_words->type = o->word_diff;
2250 ecbdata.diff_words->opt = o;
2251 if (!o->word_regex)
2252 o->word_regex = userdiff_word_regex(one);
2253 if (!o->word_regex)
2254 o->word_regex = userdiff_word_regex(two);
2255 if (!o->word_regex)
2256 o->word_regex = diff_word_regex_cfg;
2257 if (o->word_regex) {
2258 ecbdata.diff_words->word_regex = (regex_t *)
2259 xmalloc(sizeof(regex_t));
2260 if (regcomp(ecbdata.diff_words->word_regex,
2261 o->word_regex,
2262 REG_EXTENDED | REG_NEWLINE))
2263 die ("Invalid regular expression: %s",
2264 o->word_regex);
2265 }
2266 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2267 if (o->word_diff == diff_words_styles[i].type) {
2268 ecbdata.diff_words->style =
2269 &diff_words_styles[i];
2270 break;
2271 }
2272 }
2273 if (want_color(o->use_color)) {
2274 struct diff_words_style *st = ecbdata.diff_words->style;
2275 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2276 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2277 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2278 }
2279 }
2280 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2281 &xpp, &xecfg);
2282 if (o->word_diff)
2283 free_diff_words_data(&ecbdata);
2284 if (textconv_one)
2285 free(mf1.ptr);
2286 if (textconv_two)
2287 free(mf2.ptr);
2288 xdiff_clear_find_func(&xecfg);
2289 }
2290
2291 free_ab_and_return:
2292 strbuf_release(&header);
2293 diff_free_filespec_data(one);
2294 diff_free_filespec_data(two);
2295 free(a_one);
2296 free(b_two);
2297 return;
2298 }
2299
2300 static void builtin_diffstat(const char *name_a, const char *name_b,
2301 struct diff_filespec *one,
2302 struct diff_filespec *two,
2303 struct diffstat_t *diffstat,
2304 struct diff_options *o,
2305 int complete_rewrite)
2306 {
2307 mmfile_t mf1, mf2;
2308 struct diffstat_file *data;
2309
2310 data = diffstat_add(diffstat, name_a, name_b);
2311
2312 if (!one || !two) {
2313 data->is_unmerged = 1;
2314 return;
2315 }
2316
2317 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2318 data->is_binary = 1;
2319 data->added = diff_filespec_size(two);
2320 data->deleted = diff_filespec_size(one);
2321 }
2322
2323 else if (complete_rewrite) {
2324 diff_populate_filespec(one, 0);
2325 diff_populate_filespec(two, 0);
2326 data->deleted = count_lines(one->data, one->size);
2327 data->added = count_lines(two->data, two->size);
2328 }
2329
2330 else {
2331 /* Crazy xdl interfaces.. */
2332 xpparam_t xpp;
2333 xdemitconf_t xecfg;
2334
2335 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2336 die("unable to read files to diff");
2337
2338 memset(&xpp, 0, sizeof(xpp));
2339 memset(&xecfg, 0, sizeof(xecfg));
2340 xpp.flags = o->xdl_opts;
2341 xecfg.ctxlen = o->context;
2342 xecfg.interhunkctxlen = o->interhunkcontext;
2343 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2344 &xpp, &xecfg);
2345 }
2346
2347 diff_free_filespec_data(one);
2348 diff_free_filespec_data(two);
2349 }
2350
2351 static void builtin_checkdiff(const char *name_a, const char *name_b,
2352 const char *attr_path,
2353 struct diff_filespec *one,
2354 struct diff_filespec *two,
2355 struct diff_options *o)
2356 {
2357 mmfile_t mf1, mf2;
2358 struct checkdiff_t data;
2359
2360 if (!two)
2361 return;
2362
2363 memset(&data, 0, sizeof(data));
2364 data.filename = name_b ? name_b : name_a;
2365 data.lineno = 0;
2366 data.o = o;
2367 data.ws_rule = whitespace_rule(attr_path);
2368 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2369
2370 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2371 die("unable to read files to diff");
2372
2373 /*
2374 * All the other codepaths check both sides, but not checking
2375 * the "old" side here is deliberate. We are checking the newly
2376 * introduced changes, and as long as the "new" side is text, we
2377 * can and should check what it introduces.
2378 */
2379 if (diff_filespec_is_binary(two))
2380 goto free_and_return;
2381 else {
2382 /* Crazy xdl interfaces.. */
2383 xpparam_t xpp;
2384 xdemitconf_t xecfg;
2385
2386 memset(&xpp, 0, sizeof(xpp));
2387 memset(&xecfg, 0, sizeof(xecfg));
2388 xecfg.ctxlen = 1; /* at least one context line */
2389 xpp.flags = 0;
2390 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2391 &xpp, &xecfg);
2392
2393 if (data.ws_rule & WS_BLANK_AT_EOF) {
2394 struct emit_callback ecbdata;
2395 int blank_at_eof;
2396
2397 ecbdata.ws_rule = data.ws_rule;
2398 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2399 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2400
2401 if (blank_at_eof) {
2402 static char *err;
2403 if (!err)
2404 err = whitespace_error_string(WS_BLANK_AT_EOF);
2405 fprintf(o->file, "%s:%d: %s.\n",
2406 data.filename, blank_at_eof, err);
2407 data.status = 1; /* report errors */
2408 }
2409 }
2410 }
2411 free_and_return:
2412 diff_free_filespec_data(one);
2413 diff_free_filespec_data(two);
2414 if (data.status)
2415 DIFF_OPT_SET(o, CHECK_FAILED);
2416 }
2417
2418 struct diff_filespec *alloc_filespec(const char *path)
2419 {
2420 int namelen = strlen(path);
2421 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2422
2423 memset(spec, 0, sizeof(*spec));
2424 spec->path = (char *)(spec + 1);
2425 memcpy(spec->path, path, namelen+1);
2426 spec->count = 1;
2427 spec->is_binary = -1;
2428 return spec;
2429 }
2430
2431 void free_filespec(struct diff_filespec *spec)
2432 {
2433 if (!--spec->count) {
2434 diff_free_filespec_data(spec);
2435 free(spec);
2436 }
2437 }
2438
2439 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2440 unsigned short mode)
2441 {
2442 if (mode) {
2443 spec->mode = canon_mode(mode);
2444 hashcpy(spec->sha1, sha1);
2445 spec->sha1_valid = !is_null_sha1(sha1);
2446 }
2447 }
2448
2449 /*
2450 * Given a name and sha1 pair, if the index tells us the file in
2451 * the work tree has that object contents, return true, so that
2452 * prepare_temp_file() does not have to inflate and extract.
2453 */
2454 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2455 {
2456 struct cache_entry *ce;
2457 struct stat st;
2458 int pos, len;
2459
2460 /*
2461 * We do not read the cache ourselves here, because the
2462 * benchmark with my previous version that always reads cache
2463 * shows that it makes things worse for diff-tree comparing
2464 * two linux-2.6 kernel trees in an already checked out work
2465 * tree. This is because most diff-tree comparisons deal with
2466 * only a small number of files, while reading the cache is
2467 * expensive for a large project, and its cost outweighs the
2468 * savings we get by not inflating the object to a temporary
2469 * file. Practically, this code only helps when we are used
2470 * by diff-cache --cached, which does read the cache before
2471 * calling us.
2472 */
2473 if (!active_cache)
2474 return 0;
2475
2476 /* We want to avoid the working directory if our caller
2477 * doesn't need the data in a normal file, this system
2478 * is rather slow with its stat/open/mmap/close syscalls,
2479 * and the object is contained in a pack file. The pack
2480 * is probably already open and will be faster to obtain
2481 * the data through than the working directory. Loose
2482 * objects however would tend to be slower as they need
2483 * to be individually opened and inflated.
2484 */
2485 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2486 return 0;
2487
2488 len = strlen(name);
2489 pos = cache_name_pos(name, len);
2490 if (pos < 0)
2491 return 0;
2492 ce = active_cache[pos];
2493
2494 /*
2495 * This is not the sha1 we are looking for, or
2496 * unreusable because it is not a regular file.
2497 */
2498 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2499 return 0;
2500
2501 /*
2502 * If ce is marked as "assume unchanged", there is no
2503 * guarantee that work tree matches what we are looking for.
2504 */
2505 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2506 return 0;
2507
2508 /*
2509 * If ce matches the file in the work tree, we can reuse it.
2510 */
2511 if (ce_uptodate(ce) ||
2512 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2513 return 1;
2514
2515 return 0;
2516 }
2517
2518 static int populate_from_stdin(struct diff_filespec *s)
2519 {
2520 struct strbuf buf = STRBUF_INIT;
2521 size_t size = 0;
2522
2523 if (strbuf_read(&buf, 0, 0) < 0)
2524 return error("error while reading from stdin %s",
2525 strerror(errno));
2526
2527 s->should_munmap = 0;
2528 s->data = strbuf_detach(&buf, &size);
2529 s->size = size;
2530 s->should_free = 1;
2531 return 0;
2532 }
2533
2534 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2535 {
2536 int len;
2537 char *data = xmalloc(100), *dirty = "";
2538
2539 /* Are we looking at the work tree? */
2540 if (s->dirty_submodule)
2541 dirty = "-dirty";
2542
2543 len = snprintf(data, 100,
2544 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2545 s->data = data;
2546 s->size = len;
2547 s->should_free = 1;
2548 if (size_only) {
2549 s->data = NULL;
2550 free(data);
2551 }
2552 return 0;
2553 }
2554
2555 /*
2556 * While doing rename detection and pickaxe operation, we may need to
2557 * grab the data for the blob (or file) for our own in-core comparison.
2558 * diff_filespec has data and size fields for this purpose.
2559 */
2560 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2561 {
2562 int err = 0;
2563 if (!DIFF_FILE_VALID(s))
2564 die("internal error: asking to populate invalid file.");
2565 if (S_ISDIR(s->mode))
2566 return -1;
2567
2568 if (s->data)
2569 return 0;
2570
2571 if (size_only && 0 < s->size)
2572 return 0;
2573
2574 if (S_ISGITLINK(s->mode))
2575 return diff_populate_gitlink(s, size_only);
2576
2577 if (!s->sha1_valid ||
2578 reuse_worktree_file(s->path, s->sha1, 0)) {
2579 struct strbuf buf = STRBUF_INIT;
2580 struct stat st;
2581 int fd;
2582
2583 if (!strcmp(s->path, "-"))
2584 return populate_from_stdin(s);
2585
2586 if (lstat(s->path, &st) < 0) {
2587 if (errno == ENOENT) {
2588 err_empty:
2589 err = -1;
2590 empty:
2591 s->data = (char *)"";
2592 s->size = 0;
2593 return err;
2594 }
2595 }
2596 s->size = xsize_t(st.st_size);
2597 if (!s->size)
2598 goto empty;
2599 if (S_ISLNK(st.st_mode)) {
2600 struct strbuf sb = STRBUF_INIT;
2601
2602 if (strbuf_readlink(&sb, s->path, s->size))
2603 goto err_empty;
2604 s->size = sb.len;
2605 s->data = strbuf_detach(&sb, NULL);
2606 s->should_free = 1;
2607 return 0;
2608 }
2609 if (size_only)
2610 return 0;
2611 fd = open(s->path, O_RDONLY);
2612 if (fd < 0)
2613 goto err_empty;
2614 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2615 close(fd);
2616 s->should_munmap = 1;
2617
2618 /*
2619 * Convert from working tree format to canonical git format
2620 */
2621 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2622 size_t size = 0;
2623 munmap(s->data, s->size);
2624 s->should_munmap = 0;
2625 s->data = strbuf_detach(&buf, &size);
2626 s->size = size;
2627 s->should_free = 1;
2628 }
2629 }
2630 else {
2631 enum object_type type;
2632 if (size_only) {
2633 type = sha1_object_info(s->sha1, &s->size);
2634 if (type < 0)
2635 die("unable to read %s", sha1_to_hex(s->sha1));
2636 } else {
2637 s->data = read_sha1_file(s->sha1, &type, &s->size);
2638 if (!s->data)
2639 die("unable to read %s", sha1_to_hex(s->sha1));
2640 s->should_free = 1;
2641 }
2642 }
2643 return 0;
2644 }
2645
2646 void diff_free_filespec_blob(struct diff_filespec *s)
2647 {
2648 if (s->should_free)
2649 free(s->data);
2650 else if (s->should_munmap)
2651 munmap(s->data, s->size);
2652
2653 if (s->should_free || s->should_munmap) {
2654 s->should_free = s->should_munmap = 0;
2655 s->data = NULL;
2656 }
2657 }
2658
2659 void diff_free_filespec_data(struct diff_filespec *s)
2660 {
2661 diff_free_filespec_blob(s);
2662 free(s->cnt_data);
2663 s->cnt_data = NULL;
2664 }
2665
2666 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2667 void *blob,
2668 unsigned long size,
2669 const unsigned char *sha1,
2670 int mode)
2671 {
2672 int fd;
2673 struct strbuf buf = STRBUF_INIT;
2674 struct strbuf template = STRBUF_INIT;
2675 char *path_dup = xstrdup(path);
2676 const char *base = basename(path_dup);
2677
2678 /* Generate "XXXXXX_basename.ext" */
2679 strbuf_addstr(&template, "XXXXXX_");
2680 strbuf_addstr(&template, base);
2681
2682 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2683 strlen(base) + 1);
2684 if (fd < 0)
2685 die_errno("unable to create temp-file");
2686 if (convert_to_working_tree(path,
2687 (const char *)blob, (size_t)size, &buf)) {
2688 blob = buf.buf;
2689 size = buf.len;
2690 }
2691 if (write_in_full(fd, blob, size) != size)
2692 die_errno("unable to write temp-file");
2693 close(fd);
2694 temp->name = temp->tmp_path;
2695 strcpy(temp->hex, sha1_to_hex(sha1));
2696 temp->hex[40] = 0;
2697 sprintf(temp->mode, "%06o", mode);
2698 strbuf_release(&buf);
2699 strbuf_release(&template);
2700 free(path_dup);
2701 }
2702
2703 static struct diff_tempfile *prepare_temp_file(const char *name,
2704 struct diff_filespec *one)
2705 {
2706 struct diff_tempfile *temp = claim_diff_tempfile();
2707
2708 if (!DIFF_FILE_VALID(one)) {
2709 not_a_valid_file:
2710 /* A '-' entry produces this for file-2, and
2711 * a '+' entry produces this for file-1.
2712 */
2713 temp->name = "/dev/null";
2714 strcpy(temp->hex, ".");
2715 strcpy(temp->mode, ".");
2716 return temp;
2717 }
2718
2719 if (!remove_tempfile_installed) {
2720 atexit(remove_tempfile);
2721 sigchain_push_common(remove_tempfile_on_signal);
2722 remove_tempfile_installed = 1;
2723 }
2724
2725 if (!one->sha1_valid ||
2726 reuse_worktree_file(name, one->sha1, 1)) {
2727 struct stat st;
2728 if (lstat(name, &st) < 0) {
2729 if (errno == ENOENT)
2730 goto not_a_valid_file;
2731 die_errno("stat(%s)", name);
2732 }
2733 if (S_ISLNK(st.st_mode)) {
2734 struct strbuf sb = STRBUF_INIT;
2735 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2736 die_errno("readlink(%s)", name);
2737 prep_temp_blob(name, temp, sb.buf, sb.len,
2738 (one->sha1_valid ?
2739 one->sha1 : null_sha1),
2740 (one->sha1_valid ?
2741 one->mode : S_IFLNK));
2742 strbuf_release(&sb);
2743 }
2744 else {
2745 /* we can borrow from the file in the work tree */
2746 temp->name = name;
2747 if (!one->sha1_valid)
2748 strcpy(temp->hex, sha1_to_hex(null_sha1));
2749 else
2750 strcpy(temp->hex, sha1_to_hex(one->sha1));
2751 /* Even though we may sometimes borrow the
2752 * contents from the work tree, we always want
2753 * one->mode. mode is trustworthy even when
2754 * !(one->sha1_valid), as long as
2755 * DIFF_FILE_VALID(one).
2756 */
2757 sprintf(temp->mode, "%06o", one->mode);
2758 }
2759 return temp;
2760 }
2761 else {
2762 if (diff_populate_filespec(one, 0))
2763 die("cannot read data blob for %s", one->path);
2764 prep_temp_blob(name, temp, one->data, one->size,
2765 one->sha1, one->mode);
2766 }
2767 return temp;
2768 }
2769
2770 /* An external diff command takes:
2771 *
2772 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2773 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2774 *
2775 */
2776 static void run_external_diff(const char *pgm,
2777 const char *name,
2778 const char *other,
2779 struct diff_filespec *one,
2780 struct diff_filespec *two,
2781 const char *xfrm_msg,
2782 int complete_rewrite)
2783 {
2784 const char *spawn_arg[10];
2785 int retval;
2786 const char **arg = &spawn_arg[0];
2787
2788 if (one && two) {
2789 struct diff_tempfile *temp_one, *temp_two;
2790 const char *othername = (other ? other : name);
2791 temp_one = prepare_temp_file(name, one);
2792 temp_two = prepare_temp_file(othername, two);
2793 *arg++ = pgm;
2794 *arg++ = name;
2795 *arg++ = temp_one->name;
2796 *arg++ = temp_one->hex;
2797 *arg++ = temp_one->mode;
2798 *arg++ = temp_two->name;
2799 *arg++ = temp_two->hex;
2800 *arg++ = temp_two->mode;
2801 if (other) {
2802 *arg++ = other;
2803 *arg++ = xfrm_msg;
2804 }
2805 } else {
2806 *arg++ = pgm;
2807 *arg++ = name;
2808 }
2809 *arg = NULL;
2810 fflush(NULL);
2811 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2812 remove_tempfile();
2813 if (retval) {
2814 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2815 exit(1);
2816 }
2817 }
2818
2819 static int similarity_index(struct diff_filepair *p)
2820 {
2821 return p->score * 100 / MAX_SCORE;
2822 }
2823
2824 static void fill_metainfo(struct strbuf *msg,
2825 const char *name,
2826 const char *other,
2827 struct diff_filespec *one,
2828 struct diff_filespec *two,
2829 struct diff_options *o,
2830 struct diff_filepair *p,
2831 int *must_show_header,
2832 int use_color)
2833 {
2834 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2835 const char *reset = diff_get_color(use_color, DIFF_RESET);
2836 struct strbuf *msgbuf;
2837 char *line_prefix = "";
2838
2839 *must_show_header = 1;
2840 if (o->output_prefix) {
2841 msgbuf = o->output_prefix(o, o->output_prefix_data);
2842 line_prefix = msgbuf->buf;
2843 }
2844 strbuf_init(msg, PATH_MAX * 2 + 300);
2845 switch (p->status) {
2846 case DIFF_STATUS_COPIED:
2847 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2848 line_prefix, set, similarity_index(p));
2849 strbuf_addf(msg, "%s\n%s%scopy from ",
2850 reset, line_prefix, set);
2851 quote_c_style(name, msg, NULL, 0);
2852 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2853 quote_c_style(other, msg, NULL, 0);
2854 strbuf_addf(msg, "%s\n", reset);
2855 break;
2856 case DIFF_STATUS_RENAMED:
2857 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2858 line_prefix, set, similarity_index(p));
2859 strbuf_addf(msg, "%s\n%s%srename from ",
2860 reset, line_prefix, set);
2861 quote_c_style(name, msg, NULL, 0);
2862 strbuf_addf(msg, "%s\n%s%srename to ",
2863 reset, line_prefix, set);
2864 quote_c_style(other, msg, NULL, 0);
2865 strbuf_addf(msg, "%s\n", reset);
2866 break;
2867 case DIFF_STATUS_MODIFIED:
2868 if (p->score) {
2869 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2870 line_prefix,
2871 set, similarity_index(p), reset);
2872 break;
2873 }
2874 /* fallthru */
2875 default:
2876 *must_show_header = 0;
2877 }
2878 if (one && two && hashcmp(one->sha1, two->sha1)) {
2879 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2880
2881 if (DIFF_OPT_TST(o, BINARY)) {
2882 mmfile_t mf;
2883 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2884 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2885 abbrev = 40;
2886 }
2887 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2888 find_unique_abbrev(one->sha1, abbrev));
2889 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2890 if (one->mode == two->mode)
2891 strbuf_addf(msg, " %06o", one->mode);
2892 strbuf_addf(msg, "%s\n", reset);
2893 }
2894 }
2895
2896 static void run_diff_cmd(const char *pgm,
2897 const char *name,
2898 const char *other,
2899 const char *attr_path,
2900 struct diff_filespec *one,
2901 struct diff_filespec *two,
2902 struct strbuf *msg,
2903 struct diff_options *o,
2904 struct diff_filepair *p)
2905 {
2906 const char *xfrm_msg = NULL;
2907 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2908 int must_show_header = 0;
2909
2910 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2911 pgm = NULL;
2912 else {
2913 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2914 if (drv && drv->external)
2915 pgm = drv->external;
2916 }
2917
2918 if (msg) {
2919 /*
2920 * don't use colors when the header is intended for an
2921 * external diff driver
2922 */
2923 fill_metainfo(msg, name, other, one, two, o, p,
2924 &must_show_header,
2925 want_color(o->use_color) && !pgm);
2926 xfrm_msg = msg->len ? msg->buf : NULL;
2927 }
2928
2929 if (pgm) {
2930 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2931 complete_rewrite);
2932 return;
2933 }
2934 if (one && two)
2935 builtin_diff(name, other ? other : name,
2936 one, two, xfrm_msg, must_show_header,
2937 o, complete_rewrite);
2938 else
2939 fprintf(o->file, "* Unmerged path %s\n", name);
2940 }
2941
2942 static void diff_fill_sha1_info(struct diff_filespec *one)
2943 {
2944 if (DIFF_FILE_VALID(one)) {
2945 if (!one->sha1_valid) {
2946 struct stat st;
2947 if (!strcmp(one->path, "-")) {
2948 hashcpy(one->sha1, null_sha1);
2949 return;
2950 }
2951 if (lstat(one->path, &st) < 0)
2952 die_errno("stat '%s'", one->path);
2953 if (index_path(one->sha1, one->path, &st, 0))
2954 die("cannot hash %s", one->path);
2955 }
2956 }
2957 else
2958 hashclr(one->sha1);
2959 }
2960
2961 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2962 {
2963 /* Strip the prefix but do not molest /dev/null and absolute paths */
2964 if (*namep && **namep != '/') {
2965 *namep += prefix_length;
2966 if (**namep == '/')
2967 ++*namep;
2968 }
2969 if (*otherp && **otherp != '/') {
2970 *otherp += prefix_length;
2971 if (**otherp == '/')
2972 ++*otherp;
2973 }
2974 }
2975
2976 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2977 {
2978 const char *pgm = external_diff();
2979 struct strbuf msg;
2980 struct diff_filespec *one = p->one;
2981 struct diff_filespec *two = p->two;
2982 const char *name;
2983 const char *other;
2984 const char *attr_path;
2985
2986 name = p->one->path;
2987 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2988 attr_path = name;
2989 if (o->prefix_length)
2990 strip_prefix(o->prefix_length, &name, &other);
2991
2992 if (DIFF_PAIR_UNMERGED(p)) {
2993 run_diff_cmd(pgm, name, NULL, attr_path,
2994 NULL, NULL, NULL, o, p);
2995 return;
2996 }
2997
2998 diff_fill_sha1_info(one);
2999 diff_fill_sha1_info(two);
3000
3001 if (!pgm &&
3002 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
3003 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
3004 /*
3005 * a filepair that changes between file and symlink
3006 * needs to be split into deletion and creation.
3007 */
3008 struct diff_filespec *null = alloc_filespec(two->path);
3009 run_diff_cmd(NULL, name, other, attr_path,
3010 one, null, &msg, o, p);
3011 free(null);
3012 strbuf_release(&msg);
3013
3014 null = alloc_filespec(one->path);
3015 run_diff_cmd(NULL, name, other, attr_path,
3016 null, two, &msg, o, p);
3017 free(null);
3018 }
3019 else
3020 run_diff_cmd(pgm, name, other, attr_path,
3021 one, two, &msg, o, p);
3022
3023 strbuf_release(&msg);
3024 }
3025
3026 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
3027 struct diffstat_t *diffstat)
3028 {
3029 const char *name;
3030 const char *other;
3031 int complete_rewrite = 0;
3032
3033 if (DIFF_PAIR_UNMERGED(p)) {
3034 /* unmerged */
3035 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
3036 return;
3037 }
3038
3039 name = p->one->path;
3040 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3041
3042 if (o->prefix_length)
3043 strip_prefix(o->prefix_length, &name, &other);
3044
3045 diff_fill_sha1_info(p->one);
3046 diff_fill_sha1_info(p->two);
3047
3048 if (p->status == DIFF_STATUS_MODIFIED && p->score)
3049 complete_rewrite = 1;
3050 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
3051 }
3052
3053 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
3054 {
3055 const char *name;
3056 const char *other;
3057 const char *attr_path;
3058
3059 if (DIFF_PAIR_UNMERGED(p)) {
3060 /* unmerged */
3061 return;
3062 }
3063
3064 name = p->one->path;
3065 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
3066 attr_path = other ? other : name;
3067
3068 if (o->prefix_length)
3069 strip_prefix(o->prefix_length, &name, &other);
3070
3071 diff_fill_sha1_info(p->one);
3072 diff_fill_sha1_info(p->two);
3073
3074 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
3075 }
3076
3077 void diff_setup(struct diff_options *options)
3078 {
3079 memcpy(options, &default_diff_options, sizeof(*options));
3080
3081 options->file = stdout;
3082
3083 options->line_termination = '\n';
3084 options->break_opt = -1;
3085 options->rename_limit = -1;
3086 options->dirstat_permille = diff_dirstat_permille_default;
3087 options->context = 3;
3088
3089 options->change = diff_change;
3090 options->add_remove = diff_addremove;
3091 options->use_color = diff_use_color_default;
3092 options->detect_rename = diff_detect_rename_default;
3093
3094 if (diff_no_prefix) {
3095 options->a_prefix = options->b_prefix = "";
3096 } else if (!diff_mnemonic_prefix) {
3097 options->a_prefix = "a/";
3098 options->b_prefix = "b/";
3099 }
3100 }
3101
3102 int diff_setup_done(struct diff_options *options)
3103 {
3104 int count = 0;
3105
3106 if (options->output_format & DIFF_FORMAT_NAME)
3107 count++;
3108 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
3109 count++;
3110 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
3111 count++;
3112 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
3113 count++;
3114 if (count > 1)
3115 die("--name-only, --name-status, --check and -s are mutually exclusive");
3116
3117 /*
3118 * Most of the time we can say "there are changes"
3119 * only by checking if there are changed paths, but
3120 * --ignore-whitespace* options force us to look
3121 * inside contents.
3122 */
3123
3124 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
3125 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
3126 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
3127 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
3128 else
3129 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
3130
3131 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
3132 options->detect_rename = DIFF_DETECT_COPY;
3133
3134 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
3135 options->prefix = NULL;
3136 if (options->prefix)
3137 options->prefix_length = strlen(options->prefix);
3138 else
3139 options->prefix_length = 0;
3140
3141 if (options->output_format & (DIFF_FORMAT_NAME |
3142 DIFF_FORMAT_NAME_STATUS |
3143 DIFF_FORMAT_CHECKDIFF |
3144 DIFF_FORMAT_NO_OUTPUT))
3145 options->output_format &= ~(DIFF_FORMAT_RAW |
3146 DIFF_FORMAT_NUMSTAT |
3147 DIFF_FORMAT_DIFFSTAT |
3148 DIFF_FORMAT_SHORTSTAT |
3149 DIFF_FORMAT_DIRSTAT |
3150 DIFF_FORMAT_SUMMARY |
3151 DIFF_FORMAT_PATCH);
3152
3153 /*
3154 * These cases always need recursive; we do not drop caller-supplied
3155 * recursive bits for other formats here.
3156 */
3157 if (options->output_format & (DIFF_FORMAT_PATCH |
3158 DIFF_FORMAT_NUMSTAT |
3159 DIFF_FORMAT_DIFFSTAT |
3160 DIFF_FORMAT_SHORTSTAT |
3161 DIFF_FORMAT_DIRSTAT |
3162 DIFF_FORMAT_SUMMARY |
3163 DIFF_FORMAT_CHECKDIFF))
3164 DIFF_OPT_SET(options, RECURSIVE);
3165 /*
3166 * Also pickaxe would not work very well if you do not say recursive
3167 */
3168 if (options->pickaxe)
3169 DIFF_OPT_SET(options, RECURSIVE);
3170 /*
3171 * When patches are generated, submodules diffed against the work tree
3172 * must be checked for dirtiness too so it can be shown in the output
3173 */
3174 if (options->output_format & DIFF_FORMAT_PATCH)
3175 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
3176
3177 if (options->detect_rename && options->rename_limit < 0)
3178 options->rename_limit = diff_rename_limit_default;
3179 if (options->setup & DIFF_SETUP_USE_CACHE) {
3180 if (!active_cache)
3181 /* read-cache does not die even when it fails
3182 * so it is safe for us to do this here. Also
3183 * it does not smudge active_cache or active_nr
3184 * when it fails, so we do not have to worry about
3185 * cleaning it up ourselves either.
3186 */
3187 read_cache();
3188 }
3189 if (options->abbrev <= 0 || 40 < options->abbrev)
3190 options->abbrev = 40; /* full */
3191
3192 /*
3193 * It does not make sense to show the first hit we happened
3194 * to have found. It does not make sense not to return with
3195 * exit code in such a case either.
3196 */
3197 if (DIFF_OPT_TST(options, QUICK)) {
3198 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3199 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3200 }
3201
3202 return 0;
3203 }
3204
3205 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3206 {
3207 char c, *eq;
3208 int len;
3209
3210 if (*arg != '-')
3211 return 0;
3212 c = *++arg;
3213 if (!c)
3214 return 0;
3215 if (c == arg_short) {
3216 c = *++arg;
3217 if (!c)
3218 return 1;
3219 if (val && isdigit(c)) {
3220 char *end;
3221 int n = strtoul(arg, &end, 10);
3222 if (*end)
3223 return 0;
3224 *val = n;
3225 return 1;
3226 }
3227 return 0;
3228 }
3229 if (c != '-')
3230 return 0;
3231 arg++;
3232 eq = strchr(arg, '=');
3233 if (eq)
3234 len = eq - arg;
3235 else
3236 len = strlen(arg);
3237 if (!len || strncmp(arg, arg_long, len))
3238 return 0;
3239 if (eq) {
3240 int n;
3241 char *end;
3242 if (!isdigit(*++eq))
3243 return 0;
3244 n = strtoul(eq, &end, 10);
3245 if (*end)
3246 return 0;
3247 *val = n;
3248 }
3249 return 1;
3250 }
3251
3252 static int diff_scoreopt_parse(const char *opt);
3253
3254 static inline int short_opt(char opt, const char **argv,
3255 const char **optarg)
3256 {
3257 const char *arg = argv[0];
3258 if (arg[0] != '-' || arg[1] != opt)
3259 return 0;
3260 if (arg[2] != '\0') {
3261 *optarg = arg + 2;
3262 return 1;
3263 }
3264 if (!argv[1])
3265 die("Option '%c' requires a value", opt);
3266 *optarg = argv[1];
3267 return 2;
3268 }
3269
3270 int parse_long_opt(const char *opt, const char **argv,
3271 const char **optarg)
3272 {
3273 const char *arg = argv[0];
3274 if (arg[0] != '-' || arg[1] != '-')
3275 return 0;
3276 arg += strlen("--");
3277 if (prefixcmp(arg, opt))
3278 return 0;
3279 arg += strlen(opt);
3280 if (*arg == '=') { /* sticked form: --option=value */
3281 *optarg = arg + 1;
3282 return 1;
3283 }
3284 if (*arg != '\0')
3285 return 0;
3286 /* separate form: --option value */
3287 if (!argv[1])
3288 die("Option '--%s' requires a value", opt);
3289 *optarg = argv[1];
3290 return 2;
3291 }
3292
3293 static int stat_opt(struct diff_options *options, const char **av)
3294 {
3295 const char *arg = av[0];
3296 char *end;
3297 int width = options->stat_width;
3298 int name_width = options->stat_name_width;
3299 int graph_width = options->stat_graph_width;
3300 int count = options->stat_count;
3301 int argcount = 1;
3302
3303 arg += strlen("--stat");
3304 end = (char *)arg;
3305
3306 switch (*arg) {
3307 case '-':
3308 if (!prefixcmp(arg, "-width")) {
3309 arg += strlen("-width");
3310 if (*arg == '=')
3311 width = strtoul(arg + 1, &end, 10);
3312 else if (!*arg && !av[1])
3313 die("Option '--stat-width' requires a value");
3314 else if (!*arg) {
3315 width = strtoul(av[1], &end, 10);
3316 argcount = 2;
3317 }
3318 } else if (!prefixcmp(arg, "-name-width")) {
3319 arg += strlen("-name-width");
3320 if (*arg == '=')
3321 name_width = strtoul(arg + 1, &end, 10);
3322 else if (!*arg && !av[1])
3323 die("Option '--stat-name-width' requires a value");
3324 else if (!*arg) {
3325 name_width = strtoul(av[1], &end, 10);
3326 argcount = 2;
3327 }
3328 } else if (!prefixcmp(arg, "-graph-width")) {
3329 arg += strlen("-graph-width");
3330 if (*arg == '=')
3331 graph_width = strtoul(arg + 1, &end, 10);
3332 else if (!*arg && !av[1])
3333 die("Option '--stat-graph-width' requires a value");
3334 else if (!*arg) {
3335 graph_width = strtoul(av[1], &end, 10);
3336 argcount = 2;
3337 }
3338 } else if (!prefixcmp(arg, "-count")) {
3339 arg += strlen("-count");
3340 if (*arg == '=')
3341 count = strtoul(arg + 1, &end, 10);
3342 else if (!*arg && !av[1])
3343 die("Option '--stat-count' requires a value");
3344 else if (!*arg) {
3345 count = strtoul(av[1], &end, 10);
3346 argcount = 2;
3347 }
3348 }
3349 break;
3350 case '=':
3351 width = strtoul(arg+1, &end, 10);
3352 if (*end == ',')
3353 name_width = strtoul(end+1, &end, 10);
3354 if (*end == ',')
3355 count = strtoul(end+1, &end, 10);
3356 }
3357
3358 /* Important! This checks all the error cases! */
3359 if (*end)
3360 return 0;
3361 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3362 options->stat_name_width = name_width;
3363 options->stat_graph_width = graph_width;
3364 options->stat_width = width;
3365 options->stat_count = count;
3366 return argcount;
3367 }
3368
3369 static int parse_dirstat_opt(struct diff_options *options, const char *params)
3370 {
3371 struct strbuf errmsg = STRBUF_INIT;
3372 if (parse_dirstat_params(options, params, &errmsg))
3373 die(_("Failed to parse --dirstat/-X option parameter:\n%s"),
3374 errmsg.buf);
3375 strbuf_release(&errmsg);
3376 /*
3377 * The caller knows a dirstat-related option is given from the command
3378 * line; allow it to say "return this_function();"
3379 */
3380 options->output_format |= DIFF_FORMAT_DIRSTAT;
3381 return 1;
3382 }
3383
3384 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3385 {
3386 const char *arg = av[0];
3387 const char *optarg;
3388 int argcount;
3389
3390 /* Output format options */
3391 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3392 options->output_format |= DIFF_FORMAT_PATCH;
3393 else if (opt_arg(arg, 'U', "unified", &options->context))
3394 options->output_format |= DIFF_FORMAT_PATCH;
3395 else if (!strcmp(arg, "--raw"))
3396 options->output_format |= DIFF_FORMAT_RAW;
3397 else if (!strcmp(arg, "--patch-with-raw"))
3398 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3399 else if (!strcmp(arg, "--numstat"))
3400 options->output_format |= DIFF_FORMAT_NUMSTAT;
3401 else if (!strcmp(arg, "--shortstat"))
3402 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3403 else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
3404 return parse_dirstat_opt(options, "");
3405 else if (!prefixcmp(arg, "-X"))
3406 return parse_dirstat_opt(options, arg + 2);
3407 else if (!prefixcmp(arg, "--dirstat="))
3408 return parse_dirstat_opt(options, arg + 10);
3409 else if (!strcmp(arg, "--cumulative"))
3410 return parse_dirstat_opt(options, "cumulative");
3411 else if (!strcmp(arg, "--dirstat-by-file"))
3412 return parse_dirstat_opt(options, "files");
3413 else if (!prefixcmp(arg, "--dirstat-by-file=")) {
3414 parse_dirstat_opt(options, "files");
3415 return parse_dirstat_opt(options, arg + 18);
3416 }
3417 else if (!strcmp(arg, "--check"))
3418 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3419 else if (!strcmp(arg, "--summary"))
3420 options->output_format |= DIFF_FORMAT_SUMMARY;
3421 else if (!strcmp(arg, "--patch-with-stat"))
3422 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3423 else if (!strcmp(arg, "--name-only"))
3424 options->output_format |= DIFF_FORMAT_NAME;
3425 else if (!strcmp(arg, "--name-status"))
3426 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3427 else if (!strcmp(arg, "-s"))
3428 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3429 else if (!prefixcmp(arg, "--stat"))
3430 /* --stat, --stat-width, --stat-name-width, or --stat-count */
3431 return stat_opt(options, av);
3432
3433 /* renames options */
3434 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3435 !strcmp(arg, "--break-rewrites")) {
3436 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3437 return error("invalid argument to -B: %s", arg+2);
3438 }
3439 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3440 !strcmp(arg, "--find-renames")) {
3441 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3442 return error("invalid argument to -M: %s", arg+2);
3443 options->detect_rename = DIFF_DETECT_RENAME;
3444 }
3445 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3446 options->irreversible_delete = 1;
3447 }
3448 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3449 !strcmp(arg, "--find-copies")) {
3450 if (options->detect_rename == DIFF_DETECT_COPY)
3451 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3452 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3453 return error("invalid argument to -C: %s", arg+2);
3454 options->detect_rename = DIFF_DETECT_COPY;
3455 }
3456 else if (!strcmp(arg, "--no-renames"))
3457 options->detect_rename = 0;
3458 else if (!strcmp(arg, "--relative"))
3459 DIFF_OPT_SET(options, RELATIVE_NAME);
3460 else if (!prefixcmp(arg, "--relative=")) {
3461 DIFF_OPT_SET(options, RELATIVE_NAME);
3462 options->prefix = arg + 11;
3463 }
3464
3465 /* xdiff options */
3466 else if (!strcmp(arg, "--minimal"))
3467 DIFF_XDL_SET(options, NEED_MINIMAL);
3468 else if (!strcmp(arg, "--no-minimal"))
3469 DIFF_XDL_CLR(options, NEED_MINIMAL);
3470 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3471 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3472 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3473 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3474 else if (!strcmp(arg, "--ignore-space-at-eol"))
3475 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3476 else if (!strcmp(arg, "--patience"))
3477 DIFF_XDL_SET(options, PATIENCE_DIFF);
3478 else if (!strcmp(arg, "--histogram"))
3479 DIFF_XDL_SET(options, HISTOGRAM_DIFF);
3480
3481 /* flags options */
3482 else if (!strcmp(arg, "--binary")) {
3483 options->output_format |= DIFF_FORMAT_PATCH;
3484 DIFF_OPT_SET(options, BINARY);
3485 }
3486 else if (!strcmp(arg, "--full-index"))
3487 DIFF_OPT_SET(options, FULL_INDEX);
3488 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3489 DIFF_OPT_SET(options, TEXT);
3490 else if (!strcmp(arg, "-R"))
3491 DIFF_OPT_SET(options, REVERSE_DIFF);
3492 else if (!strcmp(arg, "--find-copies-harder"))
3493 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3494 else if (!strcmp(arg, "--follow"))
3495 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3496 else if (!strcmp(arg, "--color"))
3497 options->use_color = 1;
3498 else if (!prefixcmp(arg, "--color=")) {
3499 int value = git_config_colorbool(NULL, arg+8);
3500 if (value < 0)
3501 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3502 options->use_color = value;
3503 }
3504 else if (!strcmp(arg, "--no-color"))
3505 options->use_color = 0;
3506 else if (!strcmp(arg, "--color-words")) {
3507 options->use_color = 1;
3508 options->word_diff = DIFF_WORDS_COLOR;
3509 }
3510 else if (!prefixcmp(arg, "--color-words=")) {
3511 options->use_color = 1;
3512 options->word_diff = DIFF_WORDS_COLOR;
3513 options->word_regex = arg + 14;
3514 }
3515 else if (!strcmp(arg, "--word-diff")) {
3516 if (options->word_diff == DIFF_WORDS_NONE)
3517 options->word_diff = DIFF_WORDS_PLAIN;
3518 }
3519 else if (!prefixcmp(arg, "--word-diff=")) {
3520 const char *type = arg + 12;
3521 if (!strcmp(type, "plain"))
3522 options->word_diff = DIFF_WORDS_PLAIN;
3523 else if (!strcmp(type, "color")) {
3524 options->use_color = 1;
3525 options->word_diff = DIFF_WORDS_COLOR;
3526 }
3527 else if (!strcmp(type, "porcelain"))
3528 options->word_diff = DIFF_WORDS_PORCELAIN;
3529 else if (!strcmp(type, "none"))
3530 options->word_diff = DIFF_WORDS_NONE;
3531 else
3532 die("bad --word-diff argument: %s", type);
3533 }
3534 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3535 if (options->word_diff == DIFF_WORDS_NONE)
3536 options->word_diff = DIFF_WORDS_PLAIN;
3537 options->word_regex = optarg;
3538 return argcount;
3539 }
3540 else if (!strcmp(arg, "--exit-code"))
3541 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3542 else if (!strcmp(arg, "--quiet"))
3543 DIFF_OPT_SET(options, QUICK);
3544 else if (!strcmp(arg, "--ext-diff"))
3545 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3546 else if (!strcmp(arg, "--no-ext-diff"))
3547 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3548 else if (!strcmp(arg, "--textconv"))
3549 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3550 else if (!strcmp(arg, "--no-textconv"))
3551 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3552 else if (!strcmp(arg, "--ignore-submodules")) {
3553 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3554 handle_ignore_submodules_arg(options, "all");
3555 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3556 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3557 handle_ignore_submodules_arg(options, arg + 20);
3558 } else if (!strcmp(arg, "--submodule"))
3559 DIFF_OPT_SET(options, SUBMODULE_LOG);
3560 else if (!prefixcmp(arg, "--submodule=")) {
3561 if (!strcmp(arg + 12, "log"))
3562 DIFF_OPT_SET(options, SUBMODULE_LOG);
3563 }
3564
3565 /* misc options */
3566 else if (!strcmp(arg, "-z"))
3567 options->line_termination = 0;
3568 else if ((argcount = short_opt('l', av, &optarg))) {
3569 options->rename_limit = strtoul(optarg, NULL, 10);
3570 return argcount;
3571 }
3572 else if ((argcount = short_opt('S', av, &optarg))) {
3573 options->pickaxe = optarg;
3574 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3575 return argcount;
3576 } else if ((argcount = short_opt('G', av, &optarg))) {
3577 options->pickaxe = optarg;
3578 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3579 return argcount;
3580 }
3581 else if (!strcmp(arg, "--pickaxe-all"))
3582 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3583 else if (!strcmp(arg, "--pickaxe-regex"))
3584 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3585 else if ((argcount = short_opt('O', av, &optarg))) {
3586 options->orderfile = optarg;
3587 return argcount;
3588 }
3589 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3590 options->filter = optarg;
3591 return argcount;
3592 }
3593 else if (!strcmp(arg, "--abbrev"))
3594 options->abbrev = DEFAULT_ABBREV;
3595 else if (!prefixcmp(arg, "--abbrev=")) {
3596 options->abbrev = strtoul(arg + 9, NULL, 10);
3597 if (options->abbrev < MINIMUM_ABBREV)
3598 options->abbrev = MINIMUM_ABBREV;
3599 else if (40 < options->abbrev)
3600 options->abbrev = 40;
3601 }
3602 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3603 options->a_prefix = optarg;
3604 return argcount;
3605 }
3606 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3607 options->b_prefix = optarg;
3608 return argcount;
3609 }
3610 else if (!strcmp(arg, "--no-prefix"))
3611 options->a_prefix = options->b_prefix = "";
3612 else if (opt_arg(arg, '\0', "inter-hunk-context",
3613 &options->interhunkcontext))
3614 ;
3615 else if (!strcmp(arg, "-W"))
3616 DIFF_OPT_SET(options, FUNCCONTEXT);
3617 else if (!strcmp(arg, "--function-context"))
3618 DIFF_OPT_SET(options, FUNCCONTEXT);
3619 else if (!strcmp(arg, "--no-function-context"))
3620 DIFF_OPT_CLR(options, FUNCCONTEXT);
3621 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3622 options->file = fopen(optarg, "w");
3623 if (!options->file)
3624 die_errno("Could not open '%s'", optarg);
3625 options->close_file = 1;
3626 return argcount;
3627 } else
3628 return 0;
3629 return 1;
3630 }
3631
3632 int parse_rename_score(const char **cp_p)
3633 {
3634 unsigned long num, scale;
3635 int ch, dot;
3636 const char *cp = *cp_p;
3637
3638 num = 0;
3639 scale = 1;
3640 dot = 0;
3641 for (;;) {
3642 ch = *cp;
3643 if ( !dot && ch == '.' ) {
3644 scale = 1;
3645 dot = 1;
3646 } else if ( ch == '%' ) {
3647 scale = dot ? scale*100 : 100;
3648 cp++; /* % is always at the end */
3649 break;
3650 } else if ( ch >= '0' && ch <= '9' ) {
3651 if ( scale < 100000 ) {
3652 scale *= 10;
3653 num = (num*10) + (ch-'0');
3654 }
3655 } else {
3656 break;
3657 }
3658 cp++;
3659 }
3660 *cp_p = cp;
3661
3662 /* user says num divided by scale and we say internally that
3663 * is MAX_SCORE * num / scale.
3664 */
3665 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3666 }
3667
3668 static int diff_scoreopt_parse(const char *opt)
3669 {
3670 int opt1, opt2, cmd;
3671
3672 if (*opt++ != '-')
3673 return -1;
3674 cmd = *opt++;
3675 if (cmd == '-') {
3676 /* convert the long-form arguments into short-form versions */
3677 if (!prefixcmp(opt, "break-rewrites")) {
3678 opt += strlen("break-rewrites");
3679 if (*opt == 0 || *opt++ == '=')
3680 cmd = 'B';
3681 } else if (!prefixcmp(opt, "find-copies")) {
3682 opt += strlen("find-copies");
3683 if (*opt == 0 || *opt++ == '=')
3684 cmd = 'C';
3685 } else if (!prefixcmp(opt, "find-renames")) {
3686 opt += strlen("find-renames");
3687 if (*opt == 0 || *opt++ == '=')
3688 cmd = 'M';
3689 }
3690 }
3691 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3692 return -1; /* that is not a -M, -C nor -B option */
3693
3694 opt1 = parse_rename_score(&opt);
3695 if (cmd != 'B')
3696 opt2 = 0;
3697 else {
3698 if (*opt == 0)
3699 opt2 = 0;
3700 else if (*opt != '/')
3701 return -1; /* we expect -B80/99 or -B80 */
3702 else {
3703 opt++;
3704 opt2 = parse_rename_score(&opt);
3705 }
3706 }
3707 if (*opt != 0)
3708 return -1;
3709 return opt1 | (opt2 << 16);
3710 }
3711
3712 struct diff_queue_struct diff_queued_diff;
3713
3714 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3715 {
3716 if (queue->alloc <= queue->nr) {
3717 queue->alloc = alloc_nr(queue->alloc);
3718 queue->queue = xrealloc(queue->queue,
3719 sizeof(dp) * queue->alloc);
3720 }
3721 queue->queue[queue->nr++] = dp;
3722 }
3723
3724 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3725 struct diff_filespec *one,
3726 struct diff_filespec *two)
3727 {
3728 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3729 dp->one = one;
3730 dp->two = two;
3731 if (queue)
3732 diff_q(queue, dp);
3733 return dp;
3734 }
3735
3736 void diff_free_filepair(struct diff_filepair *p)
3737 {
3738 free_filespec(p->one);
3739 free_filespec(p->two);
3740 free(p);
3741 }
3742
3743 /* This is different from find_unique_abbrev() in that
3744 * it stuffs the result with dots for alignment.
3745 */
3746 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3747 {
3748 int abblen;
3749 const char *abbrev;
3750 if (len == 40)
3751 return sha1_to_hex(sha1);
3752
3753 abbrev = find_unique_abbrev(sha1, len);
3754 abblen = strlen(abbrev);
3755 if (abblen < 37) {
3756 static char hex[41];
3757 if (len < abblen && abblen <= len + 2)
3758 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3759 else
3760 sprintf(hex, "%s...", abbrev);
3761 return hex;
3762 }
3763 return sha1_to_hex(sha1);
3764 }
3765
3766 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3767 {
3768 int line_termination = opt->line_termination;
3769 int inter_name_termination = line_termination ? '\t' : '\0';
3770 if (opt->output_prefix) {
3771 struct strbuf *msg = NULL;
3772 msg = opt->output_prefix(opt, opt->output_prefix_data);
3773 fprintf(opt->file, "%s", msg->buf);
3774 }
3775
3776 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3777 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3778 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3779 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3780 }
3781 if (p->score) {
3782 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3783 inter_name_termination);
3784 } else {
3785 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3786 }
3787
3788 if (p->status == DIFF_STATUS_COPIED ||
3789 p->status == DIFF_STATUS_RENAMED) {
3790 const char *name_a, *name_b;
3791 name_a = p->one->path;
3792 name_b = p->two->path;
3793 strip_prefix(opt->prefix_length, &name_a, &name_b);
3794 write_name_quoted(name_a, opt->file, inter_name_termination);
3795 write_name_quoted(name_b, opt->file, line_termination);
3796 } else {
3797 const char *name_a, *name_b;
3798 name_a = p->one->mode ? p->one->path : p->two->path;
3799 name_b = NULL;
3800 strip_prefix(opt->prefix_length, &name_a, &name_b);
3801 write_name_quoted(name_a, opt->file, line_termination);
3802 }
3803 }
3804
3805 int diff_unmodified_pair(struct diff_filepair *p)
3806 {
3807 /* This function is written stricter than necessary to support
3808 * the currently implemented transformers, but the idea is to
3809 * let transformers to produce diff_filepairs any way they want,
3810 * and filter and clean them up here before producing the output.
3811 */
3812 struct diff_filespec *one = p->one, *two = p->two;
3813
3814 if (DIFF_PAIR_UNMERGED(p))
3815 return 0; /* unmerged is interesting */
3816
3817 /* deletion, addition, mode or type change
3818 * and rename are all interesting.
3819 */
3820 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3821 DIFF_PAIR_MODE_CHANGED(p) ||
3822 strcmp(one->path, two->path))
3823 return 0;
3824
3825 /* both are valid and point at the same path. that is, we are
3826 * dealing with a change.
3827 */
3828 if (one->sha1_valid && two->sha1_valid &&
3829 !hashcmp(one->sha1, two->sha1) &&
3830 !one->dirty_submodule && !two->dirty_submodule)
3831 return 1; /* no change */
3832 if (!one->sha1_valid && !two->sha1_valid)
3833 return 1; /* both look at the same file on the filesystem. */
3834 return 0;
3835 }
3836
3837 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3838 {
3839 if (diff_unmodified_pair(p))
3840 return;
3841
3842 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3843 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3844 return; /* no tree diffs in patch format */
3845
3846 run_diff(p, o);
3847 }
3848
3849 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3850 struct diffstat_t *diffstat)
3851 {
3852 if (diff_unmodified_pair(p))
3853 return;
3854
3855 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3856 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3857 return; /* no useful stat for tree diffs */
3858
3859 run_diffstat(p, o, diffstat);
3860 }
3861
3862 static void diff_flush_checkdiff(struct diff_filepair *p,
3863 struct diff_options *o)
3864 {
3865 if (diff_unmodified_pair(p))
3866 return;
3867
3868 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3869 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3870 return; /* nothing to check in tree diffs */
3871
3872 run_checkdiff(p, o);
3873 }
3874
3875 int diff_queue_is_empty(void)
3876 {
3877 struct diff_queue_struct *q = &diff_queued_diff;
3878 int i;
3879 for (i = 0; i < q->nr; i++)
3880 if (!diff_unmodified_pair(q->queue[i]))
3881 return 0;
3882 return 1;
3883 }
3884
3885 #if DIFF_DEBUG
3886 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3887 {
3888 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3889 x, one ? one : "",
3890 s->path,
3891 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3892 s->mode,
3893 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3894 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3895 x, one ? one : "",
3896 s->size, s->xfrm_flags);
3897 }
3898
3899 void diff_debug_filepair(const struct diff_filepair *p, int i)
3900 {
3901 diff_debug_filespec(p->one, i, "one");
3902 diff_debug_filespec(p->two, i, "two");
3903 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3904 p->score, p->status ? p->status : '?',
3905 p->one->rename_used, p->broken_pair);
3906 }
3907
3908 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3909 {
3910 int i;
3911 if (msg)
3912 fprintf(stderr, "%s\n", msg);
3913 fprintf(stderr, "q->nr = %d\n", q->nr);
3914 for (i = 0; i < q->nr; i++) {
3915 struct diff_filepair *p = q->queue[i];
3916 diff_debug_filepair(p, i);
3917 }
3918 }
3919 #endif
3920
3921 static void diff_resolve_rename_copy(void)
3922 {
3923 int i;
3924 struct diff_filepair *p;
3925 struct diff_queue_struct *q = &diff_queued_diff;
3926
3927 diff_debug_queue("resolve-rename-copy", q);
3928
3929 for (i = 0; i < q->nr; i++) {
3930 p = q->queue[i];
3931 p->status = 0; /* undecided */
3932 if (DIFF_PAIR_UNMERGED(p))
3933 p->status = DIFF_STATUS_UNMERGED;
3934 else if (!DIFF_FILE_VALID(p->one))
3935 p->status = DIFF_STATUS_ADDED;
3936 else if (!DIFF_FILE_VALID(p->two))
3937 p->status = DIFF_STATUS_DELETED;
3938 else if (DIFF_PAIR_TYPE_CHANGED(p))
3939 p->status = DIFF_STATUS_TYPE_CHANGED;
3940
3941 /* from this point on, we are dealing with a pair
3942 * whose both sides are valid and of the same type, i.e.
3943 * either in-place edit or rename/copy edit.
3944 */
3945 else if (DIFF_PAIR_RENAME(p)) {
3946 /*
3947 * A rename might have re-connected a broken
3948 * pair up, causing the pathnames to be the
3949 * same again. If so, that's not a rename at
3950 * all, just a modification..
3951 *
3952 * Otherwise, see if this source was used for
3953 * multiple renames, in which case we decrement
3954 * the count, and call it a copy.
3955 */
3956 if (!strcmp(p->one->path, p->two->path))
3957 p->status = DIFF_STATUS_MODIFIED;
3958 else if (--p->one->rename_used > 0)
3959 p->status = DIFF_STATUS_COPIED;
3960 else
3961 p->status = DIFF_STATUS_RENAMED;
3962 }
3963 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3964 p->one->mode != p->two->mode ||
3965 p->one->dirty_submodule ||
3966 p->two->dirty_submodule ||
3967 is_null_sha1(p->one->sha1))
3968 p->status = DIFF_STATUS_MODIFIED;
3969 else {
3970 /* This is a "no-change" entry and should not
3971 * happen anymore, but prepare for broken callers.
3972 */
3973 error("feeding unmodified %s to diffcore",
3974 p->one->path);
3975 p->status = DIFF_STATUS_UNKNOWN;
3976 }
3977 }
3978 diff_debug_queue("resolve-rename-copy done", q);
3979 }
3980
3981 static int check_pair_status(struct diff_filepair *p)
3982 {
3983 switch (p->status) {
3984 case DIFF_STATUS_UNKNOWN:
3985 return 0;
3986 case 0:
3987 die("internal error in diff-resolve-rename-copy");
3988 default:
3989 return 1;
3990 }
3991 }
3992
3993 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3994 {
3995 int fmt = opt->output_format;
3996
3997 if (fmt & DIFF_FORMAT_CHECKDIFF)
3998 diff_flush_checkdiff(p, opt);
3999 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
4000 diff_flush_raw(p, opt);
4001 else if (fmt & DIFF_FORMAT_NAME) {
4002 const char *name_a, *name_b;
4003 name_a = p->two->path;
4004 name_b = NULL;
4005 strip_prefix(opt->prefix_length, &name_a, &name_b);
4006 write_name_quoted(name_a, opt->file, opt->line_termination);
4007 }
4008 }
4009
4010 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4011 {
4012 if (fs->mode)
4013 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4014 else
4015 fprintf(file, " %s ", newdelete);
4016 write_name_quoted(fs->path, file, '\n');
4017 }
4018
4019
4020 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
4021 const char *line_prefix)
4022 {
4023 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
4024 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
4025 p->two->mode, show_name ? ' ' : '\n');
4026 if (show_name) {
4027 write_name_quoted(p->two->path, file, '\n');
4028 }
4029 }
4030 }
4031
4032 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
4033 const char *line_prefix)
4034 {
4035 char *names = pprint_rename(p->one->path, p->two->path);
4036
4037 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
4038 free(names);
4039 show_mode_change(file, p, 0, line_prefix);
4040 }
4041
4042 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
4043 {
4044 FILE *file = opt->file;
4045 char *line_prefix = "";
4046
4047 if (opt->output_prefix) {
4048 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
4049 line_prefix = buf->buf;
4050 }
4051
4052 switch(p->status) {
4053 case DIFF_STATUS_DELETED:
4054 fputs(line_prefix, file);
4055 show_file_mode_name(file, "delete", p->one);
4056 break;
4057 case DIFF_STATUS_ADDED:
4058 fputs(line_prefix, file);
4059 show_file_mode_name(file, "create", p->two);
4060 break;
4061 case DIFF_STATUS_COPIED:
4062 fputs(line_prefix, file);
4063 show_rename_copy(file, "copy", p, line_prefix);
4064 break;
4065 case DIFF_STATUS_RENAMED:
4066 fputs(line_prefix, file);
4067 show_rename_copy(file, "rename", p, line_prefix);
4068 break;
4069 default:
4070 if (p->score) {
4071 fprintf(file, "%s rewrite ", line_prefix);
4072 write_name_quoted(p->two->path, file, ' ');
4073 fprintf(file, "(%d%%)\n", similarity_index(p));
4074 }
4075 show_mode_change(file, p, !p->score, line_prefix);
4076 break;
4077 }
4078 }
4079
4080 struct patch_id_t {
4081 git_SHA_CTX *ctx;
4082 int patchlen;
4083 };
4084
4085 static int remove_space(char *line, int len)
4086 {
4087 int i;
4088 char *dst = line;
4089 unsigned char c;
4090
4091 for (i = 0; i < len; i++)
4092 if (!isspace((c = line[i])))
4093 *dst++ = c;
4094
4095 return dst - line;
4096 }
4097
4098 static void patch_id_consume(void *priv, char *line, unsigned long len)
4099 {
4100 struct patch_id_t *data = priv;
4101 int new_len;
4102
4103 /* Ignore line numbers when computing the SHA1 of the patch */
4104 if (!prefixcmp(line, "@@ -"))
4105 return;
4106
4107 new_len = remove_space(line, len);
4108
4109 git_SHA1_Update(data->ctx, line, new_len);
4110 data->patchlen += new_len;
4111 }
4112
4113 /* returns 0 upon success, and writes result into sha1 */
4114 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
4115 {
4116 struct diff_queue_struct *q = &diff_queued_diff;
4117 int i;
4118 git_SHA_CTX ctx;
4119 struct patch_id_t data;
4120 char buffer[PATH_MAX * 4 + 20];
4121
4122 git_SHA1_Init(&ctx);
4123 memset(&data, 0, sizeof(struct patch_id_t));
4124 data.ctx = &ctx;
4125
4126 for (i = 0; i < q->nr; i++) {
4127 xpparam_t xpp;
4128 xdemitconf_t xecfg;
4129 mmfile_t mf1, mf2;
4130 struct diff_filepair *p = q->queue[i];
4131 int len1, len2;
4132
4133 memset(&xpp, 0, sizeof(xpp));
4134 memset(&xecfg, 0, sizeof(xecfg));
4135 if (p->status == 0)
4136 return error("internal diff status error");
4137 if (p->status == DIFF_STATUS_UNKNOWN)
4138 continue;
4139 if (diff_unmodified_pair(p))
4140 continue;
4141 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
4142 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
4143 continue;
4144 if (DIFF_PAIR_UNMERGED(p))
4145 continue;
4146
4147 diff_fill_sha1_info(p->one);
4148 diff_fill_sha1_info(p->two);
4149 if (fill_mmfile(&mf1, p->one) < 0 ||
4150 fill_mmfile(&mf2, p->two) < 0)
4151 return error("unable to read files to diff");
4152
4153 len1 = remove_space(p->one->path, strlen(p->one->path));
4154 len2 = remove_space(p->two->path, strlen(p->two->path));
4155 if (p->one->mode == 0)
4156 len1 = snprintf(buffer, sizeof(buffer),
4157 "diff--gita/%.*sb/%.*s"
4158 "newfilemode%06o"
4159 "---/dev/null"
4160 "+++b/%.*s",
4161 len1, p->one->path,
4162 len2, p->two->path,
4163 p->two->mode,
4164 len2, p->two->path);
4165 else if (p->two->mode == 0)
4166 len1 = snprintf(buffer, sizeof(buffer),
4167 "diff--gita/%.*sb/%.*s"
4168 "deletedfilemode%06o"
4169 "---a/%.*s"
4170 "+++/dev/null",
4171 len1, p->one->path,
4172 len2, p->two->path,
4173 p->one->mode,
4174 len1, p->one->path);
4175 else
4176 len1 = snprintf(buffer, sizeof(buffer),
4177 "diff--gita/%.*sb/%.*s"
4178 "---a/%.*s"
4179 "+++b/%.*s",
4180 len1, p->one->path,
4181 len2, p->two->path,
4182 len1, p->one->path,
4183 len2, p->two->path);
4184 git_SHA1_Update(&ctx, buffer, len1);
4185
4186 if (diff_filespec_is_binary(p->one) ||
4187 diff_filespec_is_binary(p->two)) {
4188 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
4189 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
4190 continue;
4191 }
4192
4193 xpp.flags = 0;
4194 xecfg.ctxlen = 3;
4195 xecfg.flags = 0;
4196 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
4197 &xpp, &xecfg);
4198 }
4199
4200 git_SHA1_Final(sha1, &ctx);
4201 return 0;
4202 }
4203
4204 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
4205 {
4206 struct diff_queue_struct *q = &diff_queued_diff;
4207 int i;
4208 int result = diff_get_patch_id(options, sha1);
4209
4210 for (i = 0; i < q->nr; i++)
4211 diff_free_filepair(q->queue[i]);
4212
4213 free(q->queue);
4214 DIFF_QUEUE_CLEAR(q);
4215
4216 return result;
4217 }
4218
4219 static int is_summary_empty(const struct diff_queue_struct *q)
4220 {
4221 int i;
4222
4223 for (i = 0; i < q->nr; i++) {
4224 const struct diff_filepair *p = q->queue[i];
4225
4226 switch (p->status) {
4227 case DIFF_STATUS_DELETED:
4228 case DIFF_STATUS_ADDED:
4229 case DIFF_STATUS_COPIED:
4230 case DIFF_STATUS_RENAMED:
4231 return 0;
4232 default:
4233 if (p->score)
4234 return 0;
4235 if (p->one->mode && p->two->mode &&
4236 p->one->mode != p->two->mode)
4237 return 0;
4238 break;
4239 }
4240 }
4241 return 1;
4242 }
4243
4244 static const char rename_limit_warning[] =
4245 "inexact rename detection was skipped due to too many files.";
4246
4247 static const char degrade_cc_to_c_warning[] =
4248 "only found copies from modified paths due to too many files.";
4249
4250 static const char rename_limit_advice[] =
4251 "you may want to set your %s variable to at least "
4252 "%d and retry the command.";
4253
4254 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4255 {
4256 if (degraded_cc)
4257 warning(degrade_cc_to_c_warning);
4258 else if (needed)
4259 warning(rename_limit_warning);
4260 else
4261 return;
4262 if (0 < needed && needed < 32767)
4263 warning(rename_limit_advice, varname, needed);
4264 }
4265
4266 void diff_flush(struct diff_options *options)
4267 {
4268 struct diff_queue_struct *q = &diff_queued_diff;
4269 int i, output_format = options->output_format;
4270 int separator = 0;
4271 int dirstat_by_line = 0;
4272
4273 /*
4274 * Order: raw, stat, summary, patch
4275 * or: name/name-status/checkdiff (other bits clear)
4276 */
4277 if (!q->nr)
4278 goto free_queue;
4279
4280 if (output_format & (DIFF_FORMAT_RAW |
4281 DIFF_FORMAT_NAME |
4282 DIFF_FORMAT_NAME_STATUS |
4283 DIFF_FORMAT_CHECKDIFF)) {
4284 for (i = 0; i < q->nr; i++) {
4285 struct diff_filepair *p = q->queue[i];
4286 if (check_pair_status(p))
4287 flush_one_pair(p, options);
4288 }
4289 separator++;
4290 }
4291
4292 if (output_format & DIFF_FORMAT_DIRSTAT && DIFF_OPT_TST(options, DIRSTAT_BY_LINE))
4293 dirstat_by_line = 1;
4294
4295 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT) ||
4296 dirstat_by_line) {
4297 struct diffstat_t diffstat;
4298
4299 memset(&diffstat, 0, sizeof(struct diffstat_t));
4300 for (i = 0; i < q->nr; i++) {
4301 struct diff_filepair *p = q->queue[i];
4302 if (check_pair_status(p))
4303 diff_flush_stat(p, options, &diffstat);
4304 }
4305 if (output_format & DIFF_FORMAT_NUMSTAT)
4306 show_numstat(&diffstat, options);
4307 if (output_format & DIFF_FORMAT_DIFFSTAT)
4308 show_stats(&diffstat, options);
4309 if (output_format & DIFF_FORMAT_SHORTSTAT)
4310 show_shortstats(&diffstat, options);
4311 if (output_format & DIFF_FORMAT_DIRSTAT)
4312 show_dirstat_by_line(&diffstat, options);
4313 free_diffstat_info(&diffstat);
4314 separator++;
4315 }
4316 if ((output_format & DIFF_FORMAT_DIRSTAT) && !dirstat_by_line)
4317 show_dirstat(options);
4318
4319 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4320 for (i = 0; i < q->nr; i++) {
4321 diff_summary(options, q->queue[i]);
4322 }
4323 separator++;
4324 }
4325
4326 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4327 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4328 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4329 /*
4330 * run diff_flush_patch for the exit status. setting
4331 * options->file to /dev/null should be safe, becaue we
4332 * aren't supposed to produce any output anyway.
4333 */
4334 if (options->close_file)
4335 fclose(options->file);
4336 options->file = fopen("/dev/null", "w");
4337 if (!options->file)
4338 die_errno("Could not open /dev/null");
4339 options->close_file = 1;
4340 for (i = 0; i < q->nr; i++) {
4341 struct diff_filepair *p = q->queue[i];
4342 if (check_pair_status(p))
4343 diff_flush_patch(p, options);
4344 if (options->found_changes)
4345 break;
4346 }
4347 }
4348
4349 if (output_format & DIFF_FORMAT_PATCH) {
4350 if (separator) {
4351 putc(options->line_termination, options->file);
4352 if (options->stat_sep) {
4353 /* attach patch instead of inline */
4354 fputs(options->stat_sep, options->file);
4355 }
4356 }
4357
4358 for (i = 0; i < q->nr; i++) {
4359 struct diff_filepair *p = q->queue[i];
4360 if (check_pair_status(p))
4361 diff_flush_patch(p, options);
4362 }
4363 }
4364
4365 if (output_format & DIFF_FORMAT_CALLBACK)
4366 options->format_callback(q, options, options->format_callback_data);
4367
4368 for (i = 0; i < q->nr; i++)
4369 diff_free_filepair(q->queue[i]);
4370 free_queue:
4371 free(q->queue);
4372 DIFF_QUEUE_CLEAR(q);
4373 if (options->close_file)
4374 fclose(options->file);
4375
4376 /*
4377 * Report the content-level differences with HAS_CHANGES;
4378 * diff_addremove/diff_change does not set the bit when
4379 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4380 */
4381 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4382 if (options->found_changes)
4383 DIFF_OPT_SET(options, HAS_CHANGES);
4384 else
4385 DIFF_OPT_CLR(options, HAS_CHANGES);
4386 }
4387 }
4388
4389 static void diffcore_apply_filter(const char *filter)
4390 {
4391 int i;
4392 struct diff_queue_struct *q = &diff_queued_diff;
4393 struct diff_queue_struct outq;
4394 DIFF_QUEUE_CLEAR(&outq);
4395
4396 if (!filter)
4397 return;
4398
4399 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4400 int found;
4401 for (i = found = 0; !found && i < q->nr; i++) {
4402 struct diff_filepair *p = q->queue[i];
4403 if (((p->status == DIFF_STATUS_MODIFIED) &&
4404 ((p->score &&
4405 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4406 (!p->score &&
4407 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4408 ((p->status != DIFF_STATUS_MODIFIED) &&
4409 strchr(filter, p->status)))
4410 found++;
4411 }
4412 if (found)
4413 return;
4414
4415 /* otherwise we will clear the whole queue
4416 * by copying the empty outq at the end of this
4417 * function, but first clear the current entries
4418 * in the queue.
4419 */
4420 for (i = 0; i < q->nr; i++)
4421 diff_free_filepair(q->queue[i]);
4422 }
4423 else {
4424 /* Only the matching ones */
4425 for (i = 0; i < q->nr; i++) {
4426 struct diff_filepair *p = q->queue[i];
4427
4428 if (((p->status == DIFF_STATUS_MODIFIED) &&
4429 ((p->score &&
4430 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4431 (!p->score &&
4432 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4433 ((p->status != DIFF_STATUS_MODIFIED) &&
4434 strchr(filter, p->status)))
4435 diff_q(&outq, p);
4436 else
4437 diff_free_filepair(p);
4438 }
4439 }
4440 free(q->queue);
4441 *q = outq;
4442 }
4443
4444 /* Check whether two filespecs with the same mode and size are identical */
4445 static int diff_filespec_is_identical(struct diff_filespec *one,
4446 struct diff_filespec *two)
4447 {
4448 if (S_ISGITLINK(one->mode))
4449 return 0;
4450 if (diff_populate_filespec(one, 0))
4451 return 0;
4452 if (diff_populate_filespec(two, 0))
4453 return 0;
4454 return !memcmp(one->data, two->data, one->size);
4455 }
4456
4457 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4458 {
4459 int i;
4460 struct diff_queue_struct *q = &diff_queued_diff;
4461 struct diff_queue_struct outq;
4462 DIFF_QUEUE_CLEAR(&outq);
4463
4464 for (i = 0; i < q->nr; i++) {
4465 struct diff_filepair *p = q->queue[i];
4466
4467 /*
4468 * 1. Entries that come from stat info dirtiness
4469 * always have both sides (iow, not create/delete),
4470 * one side of the object name is unknown, with
4471 * the same mode and size. Keep the ones that
4472 * do not match these criteria. They have real
4473 * differences.
4474 *
4475 * 2. At this point, the file is known to be modified,
4476 * with the same mode and size, and the object
4477 * name of one side is unknown. Need to inspect
4478 * the identical contents.
4479 */
4480 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4481 !DIFF_FILE_VALID(p->two) ||
4482 (p->one->sha1_valid && p->two->sha1_valid) ||
4483 (p->one->mode != p->two->mode) ||
4484 diff_populate_filespec(p->one, 1) ||
4485 diff_populate_filespec(p->two, 1) ||
4486 (p->one->size != p->two->size) ||
4487 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4488 diff_q(&outq, p);
4489 else {
4490 /*
4491 * The caller can subtract 1 from skip_stat_unmatch
4492 * to determine how many paths were dirty only
4493 * due to stat info mismatch.
4494 */
4495 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4496 diffopt->skip_stat_unmatch++;
4497 diff_free_filepair(p);
4498 }
4499 }
4500 free(q->queue);
4501 *q = outq;
4502 }
4503
4504 static int diffnamecmp(const void *a_, const void *b_)
4505 {
4506 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4507 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4508 const char *name_a, *name_b;
4509
4510 name_a = a->one ? a->one->path : a->two->path;
4511 name_b = b->one ? b->one->path : b->two->path;
4512 return strcmp(name_a, name_b);
4513 }
4514
4515 void diffcore_fix_diff_index(struct diff_options *options)
4516 {
4517 struct diff_queue_struct *q = &diff_queued_diff;
4518 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4519 }
4520
4521 void diffcore_std(struct diff_options *options)
4522 {
4523 if (options->skip_stat_unmatch)
4524 diffcore_skip_stat_unmatch(options);
4525 if (!options->found_follow) {
4526 /* See try_to_follow_renames() in tree-diff.c */
4527 if (options->break_opt != -1)
4528 diffcore_break(options->break_opt);
4529 if (options->detect_rename)
4530 diffcore_rename(options);
4531 if (options->break_opt != -1)
4532 diffcore_merge_broken();
4533 }
4534 if (options->pickaxe)
4535 diffcore_pickaxe(options);
4536 if (options->orderfile)
4537 diffcore_order(options->orderfile);
4538 if (!options->found_follow)
4539 /* See try_to_follow_renames() in tree-diff.c */
4540 diff_resolve_rename_copy();
4541 diffcore_apply_filter(options->filter);
4542
4543 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4544 DIFF_OPT_SET(options, HAS_CHANGES);
4545 else
4546 DIFF_OPT_CLR(options, HAS_CHANGES);
4547
4548 options->found_follow = 0;
4549 }
4550
4551 int diff_result_code(struct diff_options *opt, int status)
4552 {
4553 int result = 0;
4554
4555 diff_warn_rename_limit("diff.renamelimit",
4556 opt->needed_rename_limit,
4557 opt->degraded_cc_to_c);
4558 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4559 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4560 return status;
4561 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4562 DIFF_OPT_TST(opt, HAS_CHANGES))
4563 result |= 01;
4564 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4565 DIFF_OPT_TST(opt, CHECK_FAILED))
4566 result |= 02;
4567 return result;
4568 }
4569
4570 int diff_can_quit_early(struct diff_options *opt)
4571 {
4572 return (DIFF_OPT_TST(opt, QUICK) &&
4573 !opt->filter &&
4574 DIFF_OPT_TST(opt, HAS_CHANGES));
4575 }
4576
4577 /*
4578 * Shall changes to this submodule be ignored?
4579 *
4580 * Submodule changes can be configured to be ignored separately for each path,
4581 * but that configuration can be overridden from the command line.
4582 */
4583 static int is_submodule_ignored(const char *path, struct diff_options *options)
4584 {
4585 int ignored = 0;
4586 unsigned orig_flags = options->flags;
4587 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4588 set_diffopt_flags_from_submodule_config(options, path);
4589 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4590 ignored = 1;
4591 options->flags = orig_flags;
4592 return ignored;
4593 }
4594
4595 void diff_addremove(struct diff_options *options,
4596 int addremove, unsigned mode,
4597 const unsigned char *sha1,
4598 const char *concatpath, unsigned dirty_submodule)
4599 {
4600 struct diff_filespec *one, *two;
4601
4602 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4603 return;
4604
4605 /* This may look odd, but it is a preparation for
4606 * feeding "there are unchanged files which should
4607 * not produce diffs, but when you are doing copy
4608 * detection you would need them, so here they are"
4609 * entries to the diff-core. They will be prefixed
4610 * with something like '=' or '*' (I haven't decided
4611 * which but should not make any difference).
4612 * Feeding the same new and old to diff_change()
4613 * also has the same effect.
4614 * Before the final output happens, they are pruned after
4615 * merged into rename/copy pairs as appropriate.
4616 */
4617 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4618 addremove = (addremove == '+' ? '-' :
4619 addremove == '-' ? '+' : addremove);
4620
4621 if (options->prefix &&
4622 strncmp(concatpath, options->prefix, options->prefix_length))
4623 return;
4624
4625 one = alloc_filespec(concatpath);
4626 two = alloc_filespec(concatpath);
4627
4628 if (addremove != '+')
4629 fill_filespec(one, sha1, mode);
4630 if (addremove != '-') {
4631 fill_filespec(two, sha1, mode);
4632 two->dirty_submodule = dirty_submodule;
4633 }
4634
4635 diff_queue(&diff_queued_diff, one, two);
4636 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4637 DIFF_OPT_SET(options, HAS_CHANGES);
4638 }
4639
4640 void diff_change(struct diff_options *options,
4641 unsigned old_mode, unsigned new_mode,
4642 const unsigned char *old_sha1,
4643 const unsigned char *new_sha1,
4644 const char *concatpath,
4645 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4646 {
4647 struct diff_filespec *one, *two;
4648
4649 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4650 is_submodule_ignored(concatpath, options))
4651 return;
4652
4653 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4654 unsigned tmp;
4655 const unsigned char *tmp_c;
4656 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4657 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4658 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4659 new_dirty_submodule = tmp;
4660 }
4661
4662 if (options->prefix &&
4663 strncmp(concatpath, options->prefix, options->prefix_length))
4664 return;
4665
4666 one = alloc_filespec(concatpath);
4667 two = alloc_filespec(concatpath);
4668 fill_filespec(one, old_sha1, old_mode);
4669 fill_filespec(two, new_sha1, new_mode);
4670 one->dirty_submodule = old_dirty_submodule;
4671 two->dirty_submodule = new_dirty_submodule;
4672
4673 diff_queue(&diff_queued_diff, one, two);
4674 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4675 DIFF_OPT_SET(options, HAS_CHANGES);
4676 }
4677
4678 struct diff_filepair *diff_unmerge(struct diff_options *options, const char *path)
4679 {
4680 struct diff_filepair *pair;
4681 struct diff_filespec *one, *two;
4682
4683 if (options->prefix &&
4684 strncmp(path, options->prefix, options->prefix_length))
4685 return NULL;
4686
4687 one = alloc_filespec(path);
4688 two = alloc_filespec(path);
4689 pair = diff_queue(&diff_queued_diff, one, two);
4690 pair->is_unmerged = 1;
4691 return pair;
4692 }
4693
4694 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4695 size_t *outsize)
4696 {
4697 struct diff_tempfile *temp;
4698 const char *argv[3];
4699 const char **arg = argv;
4700 struct child_process child;
4701 struct strbuf buf = STRBUF_INIT;
4702 int err = 0;
4703
4704 temp = prepare_temp_file(spec->path, spec);
4705 *arg++ = pgm;
4706 *arg++ = temp->name;
4707 *arg = NULL;
4708
4709 memset(&child, 0, sizeof(child));
4710 child.use_shell = 1;
4711 child.argv = argv;
4712 child.out = -1;
4713 if (start_command(&child)) {
4714 remove_tempfile();
4715 return NULL;
4716 }
4717
4718 if (strbuf_read(&buf, child.out, 0) < 0)
4719 err = error("error reading from textconv command '%s'", pgm);
4720 close(child.out);
4721
4722 if (finish_command(&child) || err) {
4723 strbuf_release(&buf);
4724 remove_tempfile();
4725 return NULL;
4726 }
4727 remove_tempfile();
4728
4729 return strbuf_detach(&buf, outsize);
4730 }
4731
4732 size_t fill_textconv(struct userdiff_driver *driver,
4733 struct diff_filespec *df,
4734 char **outbuf)
4735 {
4736 size_t size;
4737
4738 if (!driver || !driver->textconv) {
4739 if (!DIFF_FILE_VALID(df)) {
4740 *outbuf = "";
4741 return 0;
4742 }
4743 if (diff_populate_filespec(df, 0))
4744 die("unable to read files to diff");
4745 *outbuf = df->data;
4746 return df->size;
4747 }
4748
4749 if (driver->textconv_cache && df->sha1_valid) {
4750 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4751 &size);
4752 if (*outbuf)
4753 return size;
4754 }
4755
4756 *outbuf = run_textconv(driver->textconv, df, &size);
4757 if (!*outbuf)
4758 die("unable to read files to diff");
4759
4760 if (driver->textconv_cache && df->sha1_valid) {
4761 /* ignore errors, as we might be in a readonly repository */
4762 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4763 size);
4764 /*
4765 * we could save up changes and flush them all at the end,
4766 * but we would need an extra call after all diffing is done.
4767 * Since generating a cache entry is the slow path anyway,
4768 * this extra overhead probably isn't a big deal.
4769 */
4770 notes_cache_write(driver->textconv_cache);
4771 }
4772
4773 return size;
4774 }
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