?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
gitweb: Fix handling of fractional timezones in parse_date
[git/mjg.git] / diff.c
blob3fd9e0c70315727f835f39d9a0230ee9f24e7ea8
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 = 200;
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 struct diff_options default_diff_options;
35
36 static char diff_colors[][COLOR_MAXLEN] = {
37 GIT_COLOR_RESET,
38 GIT_COLOR_NORMAL, /* PLAIN */
39 GIT_COLOR_BOLD, /* METAINFO */
40 GIT_COLOR_CYAN, /* FRAGINFO */
41 GIT_COLOR_RED, /* OLD */
42 GIT_COLOR_GREEN, /* NEW */
43 GIT_COLOR_YELLOW, /* COMMIT */
44 GIT_COLOR_BG_RED, /* WHITESPACE */
45 GIT_COLOR_NORMAL, /* FUNCINFO */
46 };
47
48 static int parse_diff_color_slot(const char *var, int ofs)
49 {
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
66 return -1;
67 }
68
69 static int git_config_rename(const char *var, const char *value)
70 {
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76 }
77
78 /*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
84 int git_diff_ui_config(const char *var, const char *value, void *cb)
85 {
86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
87 diff_use_color_default = git_config_colorbool(var, value, -1);
88 return 0;
89 }
90 if (!strcmp(var, "diff.renames")) {
91 diff_detect_rename_default = git_config_rename(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
102 if (!strcmp(var, "diff.noprefix")) {
103 diff_no_prefix = git_config_bool(var, value);
104 return 0;
105 }
106 if (!strcmp(var, "diff.external"))
107 return git_config_string(&external_diff_cmd_cfg, var, value);
108 if (!strcmp(var, "diff.wordregex"))
109 return git_config_string(&diff_word_regex_cfg, var, value);
110
111 if (!strcmp(var, "diff.ignoresubmodules"))
112 handle_ignore_submodules_arg(&default_diff_options, value);
113
114 return git_diff_basic_config(var, value, cb);
115 }
116
117 int git_diff_basic_config(const char *var, const char *value, void *cb)
118 {
119 if (!strcmp(var, "diff.renamelimit")) {
120 diff_rename_limit_default = git_config_int(var, value);
121 return 0;
122 }
123
124 switch (userdiff_config(var, value)) {
125 case 0: break;
126 case -1: return -1;
127 default: return 0;
128 }
129
130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
131 int slot = parse_diff_color_slot(var, 11);
132 if (slot < 0)
133 return 0;
134 if (!value)
135 return config_error_nonbool(var);
136 color_parse(value, var, diff_colors[slot]);
137 return 0;
138 }
139
140 /* like GNU diff's --suppress-blank-empty option */
141 if (!strcmp(var, "diff.suppressblankempty") ||
142 /* for backwards compatibility */
143 !strcmp(var, "diff.suppress-blank-empty")) {
144 diff_suppress_blank_empty = git_config_bool(var, value);
145 return 0;
146 }
147
148 if (!prefixcmp(var, "submodule."))
149 return parse_submodule_config_option(var, value);
150
151 return git_color_default_config(var, value, cb);
152 }
153
154 static char *quote_two(const char *one, const char *two)
155 {
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
158 struct strbuf res = STRBUF_INIT;
159
160 if (need_one + need_two) {
161 strbuf_addch(&res, '"');
162 quote_c_style(one, &res, NULL, 1);
163 quote_c_style(two, &res, NULL, 1);
164 strbuf_addch(&res, '"');
165 } else {
166 strbuf_addstr(&res, one);
167 strbuf_addstr(&res, two);
168 }
169 return strbuf_detach(&res, NULL);
170 }
171
172 static const char *external_diff(void)
173 {
174 static const char *external_diff_cmd = NULL;
175 static int done_preparing = 0;
176
177 if (done_preparing)
178 return external_diff_cmd;
179 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
180 if (!external_diff_cmd)
181 external_diff_cmd = external_diff_cmd_cfg;
182 done_preparing = 1;
183 return external_diff_cmd;
184 }
185
186 static struct diff_tempfile {
187 const char *name; /* filename external diff should read from */
188 char hex[41];
189 char mode[10];
190 char tmp_path[PATH_MAX];
191 } diff_temp[2];
192
193 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
194
195 struct emit_callback {
196 int color_diff;
197 unsigned ws_rule;
198 int blank_at_eof_in_preimage;
199 int blank_at_eof_in_postimage;
200 int lno_in_preimage;
201 int lno_in_postimage;
202 sane_truncate_fn truncate;
203 const char **label_path;
204 struct diff_words_data *diff_words;
205 struct diff_options *opt;
206 int *found_changesp;
207 struct strbuf *header;
208 };
209
210 static int count_lines(const char *data, int size)
211 {
212 int count, ch, completely_empty = 1, nl_just_seen = 0;
213 count = 0;
214 while (0 < size--) {
215 ch = *data++;
216 if (ch == '\n') {
217 count++;
218 nl_just_seen = 1;
219 completely_empty = 0;
220 }
221 else {
222 nl_just_seen = 0;
223 completely_empty = 0;
224 }
225 }
226 if (completely_empty)
227 return 0;
228 if (!nl_just_seen)
229 count++; /* no trailing newline */
230 return count;
231 }
232
233 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
234 {
235 if (!DIFF_FILE_VALID(one)) {
236 mf->ptr = (char *)""; /* does not matter */
237 mf->size = 0;
238 return 0;
239 }
240 else if (diff_populate_filespec(one, 0))
241 return -1;
242
243 mf->ptr = one->data;
244 mf->size = one->size;
245 return 0;
246 }
247
248 /* like fill_mmfile, but only for size, so we can avoid retrieving blob */
249 static unsigned long diff_filespec_size(struct diff_filespec *one)
250 {
251 if (!DIFF_FILE_VALID(one))
252 return 0;
253 diff_populate_filespec(one, 1);
254 return one->size;
255 }
256
257 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
258 {
259 char *ptr = mf->ptr;
260 long size = mf->size;
261 int cnt = 0;
262
263 if (!size)
264 return cnt;
265 ptr += size - 1; /* pointing at the very end */
266 if (*ptr != '\n')
267 ; /* incomplete line */
268 else
269 ptr--; /* skip the last LF */
270 while (mf->ptr < ptr) {
271 char *prev_eol;
272 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
273 if (*prev_eol == '\n')
274 break;
275 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
276 break;
277 cnt++;
278 ptr = prev_eol - 1;
279 }
280 return cnt;
281 }
282
283 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
284 struct emit_callback *ecbdata)
285 {
286 int l1, l2, at;
287 unsigned ws_rule = ecbdata->ws_rule;
288 l1 = count_trailing_blank(mf1, ws_rule);
289 l2 = count_trailing_blank(mf2, ws_rule);
290 if (l2 <= l1) {
291 ecbdata->blank_at_eof_in_preimage = 0;
292 ecbdata->blank_at_eof_in_postimage = 0;
293 return;
294 }
295 at = count_lines(mf1->ptr, mf1->size);
296 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
297
298 at = count_lines(mf2->ptr, mf2->size);
299 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
300 }
301
302 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
303 int first, const char *line, int len)
304 {
305 int has_trailing_newline, has_trailing_carriage_return;
306 int nofirst;
307 FILE *file = o->file;
308
309 if (o->output_prefix) {
310 struct strbuf *msg = NULL;
311 msg = o->output_prefix(o, o->output_prefix_data);
312 assert(msg);
313 fwrite(msg->buf, msg->len, 1, file);
314 }
315
316 if (len == 0) {
317 has_trailing_newline = (first == '\n');
318 has_trailing_carriage_return = (!has_trailing_newline &&
319 (first == '\r'));
320 nofirst = has_trailing_newline || has_trailing_carriage_return;
321 } else {
322 has_trailing_newline = (len > 0 && line[len-1] == '\n');
323 if (has_trailing_newline)
324 len--;
325 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
326 if (has_trailing_carriage_return)
327 len--;
328 nofirst = 0;
329 }
330
331 if (len || !nofirst) {
332 fputs(set, file);
333 if (!nofirst)
334 fputc(first, file);
335 fwrite(line, len, 1, file);
336 fputs(reset, file);
337 }
338 if (has_trailing_carriage_return)
339 fputc('\r', file);
340 if (has_trailing_newline)
341 fputc('\n', file);
342 }
343
344 static void emit_line(struct diff_options *o, const char *set, const char *reset,
345 const char *line, int len)
346 {
347 emit_line_0(o, set, reset, line[0], line+1, len-1);
348 }
349
350 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
351 {
352 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
353 ecbdata->blank_at_eof_in_preimage &&
354 ecbdata->blank_at_eof_in_postimage &&
355 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
356 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
357 return 0;
358 return ws_blank_line(line, len, ecbdata->ws_rule);
359 }
360
361 static void emit_add_line(const char *reset,
362 struct emit_callback *ecbdata,
363 const char *line, int len)
364 {
365 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
366 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
367
368 if (!*ws)
369 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
370 else if (new_blank_line_at_eof(ecbdata, line, len))
371 /* Blank line at EOF - paint '+' as well */
372 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
373 else {
374 /* Emit just the prefix, then the rest. */
375 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
376 ws_check_emit(line, len, ecbdata->ws_rule,
377 ecbdata->opt->file, set, reset, ws);
378 }
379 }
380
381 static void emit_hunk_header(struct emit_callback *ecbdata,
382 const char *line, int len)
383 {
384 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
385 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
386 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
387 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
388 static const char atat[2] = { '@', '@' };
389 const char *cp, *ep;
390 struct strbuf msgbuf = STRBUF_INIT;
391 int org_len = len;
392 int i = 1;
393
394 /*
395 * As a hunk header must begin with "@@ -<old>, +<new> @@",
396 * it always is at least 10 bytes long.
397 */
398 if (len < 10 ||
399 memcmp(line, atat, 2) ||
400 !(ep = memmem(line + 2, len - 2, atat, 2))) {
401 emit_line(ecbdata->opt, plain, reset, line, len);
402 return;
403 }
404 ep += 2; /* skip over @@ */
405
406 /* The hunk header in fraginfo color */
407 strbuf_add(&msgbuf, frag, strlen(frag));
408 strbuf_add(&msgbuf, line, ep - line);
409 strbuf_add(&msgbuf, reset, strlen(reset));
410
411 /*
412 * trailing "\r\n"
413 */
414 for ( ; i < 3; i++)
415 if (line[len - i] == '\r' || line[len - i] == '\n')
416 len--;
417
418 /* blank before the func header */
419 for (cp = ep; ep - line < len; ep++)
420 if (*ep != ' ' && *ep != '\t')
421 break;
422 if (ep != cp) {
423 strbuf_add(&msgbuf, plain, strlen(plain));
424 strbuf_add(&msgbuf, cp, ep - cp);
425 strbuf_add(&msgbuf, reset, strlen(reset));
426 }
427
428 if (ep < line + len) {
429 strbuf_add(&msgbuf, func, strlen(func));
430 strbuf_add(&msgbuf, ep, line + len - ep);
431 strbuf_add(&msgbuf, reset, strlen(reset));
432 }
433
434 strbuf_add(&msgbuf, line + len, org_len - len);
435 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
436 strbuf_release(&msgbuf);
437 }
438
439 static struct diff_tempfile *claim_diff_tempfile(void) {
440 int i;
441 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
442 if (!diff_temp[i].name)
443 return diff_temp + i;
444 die("BUG: diff is failing to clean up its tempfiles");
445 }
446
447 static int remove_tempfile_installed;
448
449 static void remove_tempfile(void)
450 {
451 int i;
452 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
453 if (diff_temp[i].name == diff_temp[i].tmp_path)
454 unlink_or_warn(diff_temp[i].name);
455 diff_temp[i].name = NULL;
456 }
457 }
458
459 static void remove_tempfile_on_signal(int signo)
460 {
461 remove_tempfile();
462 sigchain_pop(signo);
463 raise(signo);
464 }
465
466 static void print_line_count(FILE *file, int count)
467 {
468 switch (count) {
469 case 0:
470 fprintf(file, "0,0");
471 break;
472 case 1:
473 fprintf(file, "1");
474 break;
475 default:
476 fprintf(file, "1,%d", count);
477 break;
478 }
479 }
480
481 static void emit_rewrite_lines(struct emit_callback *ecb,
482 int prefix, const char *data, int size)
483 {
484 const char *endp = NULL;
485 static const char *nneof = " No newline at end of file\n";
486 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
487 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
488
489 while (0 < size) {
490 int len;
491
492 endp = memchr(data, '\n', size);
493 len = endp ? (endp - data + 1) : size;
494 if (prefix != '+') {
495 ecb->lno_in_preimage++;
496 emit_line_0(ecb->opt, old, reset, '-',
497 data, len);
498 } else {
499 ecb->lno_in_postimage++;
500 emit_add_line(reset, ecb, data, len);
501 }
502 size -= len;
503 data += len;
504 }
505 if (!endp) {
506 const char *plain = diff_get_color(ecb->color_diff,
507 DIFF_PLAIN);
508 emit_line_0(ecb->opt, plain, reset, '\\',
509 nneof, strlen(nneof));
510 }
511 }
512
513 static void emit_rewrite_diff(const char *name_a,
514 const char *name_b,
515 struct diff_filespec *one,
516 struct diff_filespec *two,
517 struct userdiff_driver *textconv_one,
518 struct userdiff_driver *textconv_two,
519 struct diff_options *o)
520 {
521 int lc_a, lc_b;
522 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
523 const char *name_a_tab, *name_b_tab;
524 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
525 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
526 const char *reset = diff_get_color(color_diff, DIFF_RESET);
527 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
528 const char *a_prefix, *b_prefix;
529 char *data_one, *data_two;
530 size_t size_one, size_two;
531 struct emit_callback ecbdata;
532 char *line_prefix = "";
533 struct strbuf *msgbuf;
534
535 if (o && o->output_prefix) {
536 msgbuf = o->output_prefix(o, o->output_prefix_data);
537 line_prefix = msgbuf->buf;
538 }
539
540 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
541 a_prefix = o->b_prefix;
542 b_prefix = o->a_prefix;
543 } else {
544 a_prefix = o->a_prefix;
545 b_prefix = o->b_prefix;
546 }
547
548 name_a += (*name_a == '/');
549 name_b += (*name_b == '/');
550 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
551 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
552
553 strbuf_reset(&a_name);
554 strbuf_reset(&b_name);
555 quote_two_c_style(&a_name, a_prefix, name_a, 0);
556 quote_two_c_style(&b_name, b_prefix, name_b, 0);
557
558 size_one = fill_textconv(textconv_one, one, &data_one);
559 size_two = fill_textconv(textconv_two, two, &data_two);
560
561 memset(&ecbdata, 0, sizeof(ecbdata));
562 ecbdata.color_diff = color_diff;
563 ecbdata.found_changesp = &o->found_changes;
564 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
565 ecbdata.opt = o;
566 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
567 mmfile_t mf1, mf2;
568 mf1.ptr = (char *)data_one;
569 mf2.ptr = (char *)data_two;
570 mf1.size = size_one;
571 mf2.size = size_two;
572 check_blank_at_eof(&mf1, &mf2, &ecbdata);
573 }
574 ecbdata.lno_in_preimage = 1;
575 ecbdata.lno_in_postimage = 1;
576
577 lc_a = count_lines(data_one, size_one);
578 lc_b = count_lines(data_two, size_two);
579 fprintf(o->file,
580 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
581 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
582 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
583 line_prefix, fraginfo);
584 print_line_count(o->file, lc_a);
585 fprintf(o->file, " +");
586 print_line_count(o->file, lc_b);
587 fprintf(o->file, " @@%s\n", reset);
588 if (lc_a)
589 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
590 if (lc_b)
591 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
592 if (textconv_one)
593 free((char *)data_one);
594 if (textconv_two)
595 free((char *)data_two);
596 }
597
598 struct diff_words_buffer {
599 mmfile_t text;
600 long alloc;
601 struct diff_words_orig {
602 const char *begin, *end;
603 } *orig;
604 int orig_nr, orig_alloc;
605 };
606
607 static void diff_words_append(char *line, unsigned long len,
608 struct diff_words_buffer *buffer)
609 {
610 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
611 line++;
612 len--;
613 memcpy(buffer->text.ptr + buffer->text.size, line, len);
614 buffer->text.size += len;
615 buffer->text.ptr[buffer->text.size] = '\0';
616 }
617
618 struct diff_words_style_elem {
619 const char *prefix;
620 const char *suffix;
621 const char *color; /* NULL; filled in by the setup code if
622 * color is enabled */
623 };
624
625 struct diff_words_style {
626 enum diff_words_type type;
627 struct diff_words_style_elem new, old, ctx;
628 const char *newline;
629 };
630
631 struct diff_words_style diff_words_styles[] = {
632 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
633 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
634 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
635 };
636
637 struct diff_words_data {
638 struct diff_words_buffer minus, plus;
639 const char *current_plus;
640 int last_minus;
641 struct diff_options *opt;
642 regex_t *word_regex;
643 enum diff_words_type type;
644 struct diff_words_style *style;
645 };
646
647 static int fn_out_diff_words_write_helper(FILE *fp,
648 struct diff_words_style_elem *st_el,
649 const char *newline,
650 size_t count, const char *buf,
651 const char *line_prefix)
652 {
653 int print = 0;
654
655 while (count) {
656 char *p = memchr(buf, '\n', count);
657 if (print)
658 fputs(line_prefix, fp);
659 if (p != buf) {
660 if (st_el->color && fputs(st_el->color, fp) < 0)
661 return -1;
662 if (fputs(st_el->prefix, fp) < 0 ||
663 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
664 fputs(st_el->suffix, fp) < 0)
665 return -1;
666 if (st_el->color && *st_el->color
667 && fputs(GIT_COLOR_RESET, fp) < 0)
668 return -1;
669 }
670 if (!p)
671 return 0;
672 if (fputs(newline, fp) < 0)
673 return -1;
674 count -= p + 1 - buf;
675 buf = p + 1;
676 print = 1;
677 }
678 return 0;
679 }
680
681 /*
682 * '--color-words' algorithm can be described as:
683 *
684 * 1. collect a the minus/plus lines of a diff hunk, divided into
685 * minus-lines and plus-lines;
686 *
687 * 2. break both minus-lines and plus-lines into words and
688 * place them into two mmfile_t with one word for each line;
689 *
690 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
691 *
692 * And for the common parts of the both file, we output the plus side text.
693 * diff_words->current_plus is used to trace the current position of the plus file
694 * which printed. diff_words->last_minus is used to trace the last minus word
695 * printed.
696 *
697 * For '--graph' to work with '--color-words', we need to output the graph prefix
698 * on each line of color words output. Generally, there are two conditions on
699 * which we should output the prefix.
700 *
701 * 1. diff_words->last_minus == 0 &&
702 * diff_words->current_plus == diff_words->plus.text.ptr
703 *
704 * that is: the plus text must start as a new line, and if there is no minus
705 * word printed, a graph prefix must be printed.
706 *
707 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
708 * *(diff_words->current_plus - 1) == '\n'
709 *
710 * that is: a graph prefix must be printed following a '\n'
711 */
712 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
713 {
714 if ((diff_words->last_minus == 0 &&
715 diff_words->current_plus == diff_words->plus.text.ptr) ||
716 (diff_words->current_plus > diff_words->plus.text.ptr &&
717 *(diff_words->current_plus - 1) == '\n')) {
718 return 1;
719 } else {
720 return 0;
721 }
722 }
723
724 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
725 {
726 struct diff_words_data *diff_words = priv;
727 struct diff_words_style *style = diff_words->style;
728 int minus_first, minus_len, plus_first, plus_len;
729 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
730 struct diff_options *opt = diff_words->opt;
731 struct strbuf *msgbuf;
732 char *line_prefix = "";
733
734 if (line[0] != '@' || parse_hunk_header(line, len,
735 &minus_first, &minus_len, &plus_first, &plus_len))
736 return;
737
738 assert(opt);
739 if (opt->output_prefix) {
740 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
741 line_prefix = msgbuf->buf;
742 }
743
744 /* POSIX requires that first be decremented by one if len == 0... */
745 if (minus_len) {
746 minus_begin = diff_words->minus.orig[minus_first].begin;
747 minus_end =
748 diff_words->minus.orig[minus_first + minus_len - 1].end;
749 } else
750 minus_begin = minus_end =
751 diff_words->minus.orig[minus_first].end;
752
753 if (plus_len) {
754 plus_begin = diff_words->plus.orig[plus_first].begin;
755 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
756 } else
757 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
758
759 if (color_words_output_graph_prefix(diff_words)) {
760 fputs(line_prefix, diff_words->opt->file);
761 }
762 if (diff_words->current_plus != plus_begin) {
763 fn_out_diff_words_write_helper(diff_words->opt->file,
764 &style->ctx, style->newline,
765 plus_begin - diff_words->current_plus,
766 diff_words->current_plus, line_prefix);
767 if (*(plus_begin - 1) == '\n')
768 fputs(line_prefix, diff_words->opt->file);
769 }
770 if (minus_begin != minus_end) {
771 fn_out_diff_words_write_helper(diff_words->opt->file,
772 &style->old, style->newline,
773 minus_end - minus_begin, minus_begin,
774 line_prefix);
775 }
776 if (plus_begin != plus_end) {
777 fn_out_diff_words_write_helper(diff_words->opt->file,
778 &style->new, style->newline,
779 plus_end - plus_begin, plus_begin,
780 line_prefix);
781 }
782
783 diff_words->current_plus = plus_end;
784 diff_words->last_minus = minus_first;
785 }
786
787 /* This function starts looking at *begin, and returns 0 iff a word was found. */
788 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
789 int *begin, int *end)
790 {
791 if (word_regex && *begin < buffer->size) {
792 regmatch_t match[1];
793 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
794 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
795 '\n', match[0].rm_eo - match[0].rm_so);
796 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
797 *begin += match[0].rm_so;
798 return *begin >= *end;
799 }
800 return -1;
801 }
802
803 /* find the next word */
804 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
805 (*begin)++;
806 if (*begin >= buffer->size)
807 return -1;
808
809 /* find the end of the word */
810 *end = *begin + 1;
811 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
812 (*end)++;
813
814 return 0;
815 }
816
817 /*
818 * This function splits the words in buffer->text, stores the list with
819 * newline separator into out, and saves the offsets of the original words
820 * in buffer->orig.
821 */
822 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
823 regex_t *word_regex)
824 {
825 int i, j;
826 long alloc = 0;
827
828 out->size = 0;
829 out->ptr = NULL;
830
831 /* fake an empty "0th" word */
832 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
833 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
834 buffer->orig_nr = 1;
835
836 for (i = 0; i < buffer->text.size; i++) {
837 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
838 return;
839
840 /* store original boundaries */
841 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
842 buffer->orig_alloc);
843 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
844 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
845 buffer->orig_nr++;
846
847 /* store one word */
848 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
849 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
850 out->ptr[out->size + j - i] = '\n';
851 out->size += j - i + 1;
852
853 i = j - 1;
854 }
855 }
856
857 /* this executes the word diff on the accumulated buffers */
858 static void diff_words_show(struct diff_words_data *diff_words)
859 {
860 xpparam_t xpp;
861 xdemitconf_t xecfg;
862 mmfile_t minus, plus;
863 struct diff_words_style *style = diff_words->style;
864
865 struct diff_options *opt = diff_words->opt;
866 struct strbuf *msgbuf;
867 char *line_prefix = "";
868
869 assert(opt);
870 if (opt->output_prefix) {
871 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
872 line_prefix = msgbuf->buf;
873 }
874
875 /* special case: only removal */
876 if (!diff_words->plus.text.size) {
877 fputs(line_prefix, diff_words->opt->file);
878 fn_out_diff_words_write_helper(diff_words->opt->file,
879 &style->old, style->newline,
880 diff_words->minus.text.size,
881 diff_words->minus.text.ptr, line_prefix);
882 diff_words->minus.text.size = 0;
883 return;
884 }
885
886 diff_words->current_plus = diff_words->plus.text.ptr;
887 diff_words->last_minus = 0;
888
889 memset(&xpp, 0, sizeof(xpp));
890 memset(&xecfg, 0, sizeof(xecfg));
891 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
892 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
893 xpp.flags = 0;
894 /* as only the hunk header will be parsed, we need a 0-context */
895 xecfg.ctxlen = 0;
896 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
897 &xpp, &xecfg);
898 free(minus.ptr);
899 free(plus.ptr);
900 if (diff_words->current_plus != diff_words->plus.text.ptr +
901 diff_words->plus.text.size) {
902 if (color_words_output_graph_prefix(diff_words))
903 fputs(line_prefix, diff_words->opt->file);
904 fn_out_diff_words_write_helper(diff_words->opt->file,
905 &style->ctx, style->newline,
906 diff_words->plus.text.ptr + diff_words->plus.text.size
907 - diff_words->current_plus, diff_words->current_plus,
908 line_prefix);
909 }
910 diff_words->minus.text.size = diff_words->plus.text.size = 0;
911 }
912
913 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
914 static void diff_words_flush(struct emit_callback *ecbdata)
915 {
916 if (ecbdata->diff_words->minus.text.size ||
917 ecbdata->diff_words->plus.text.size)
918 diff_words_show(ecbdata->diff_words);
919 }
920
921 static void free_diff_words_data(struct emit_callback *ecbdata)
922 {
923 if (ecbdata->diff_words) {
924 diff_words_flush(ecbdata);
925 free (ecbdata->diff_words->minus.text.ptr);
926 free (ecbdata->diff_words->minus.orig);
927 free (ecbdata->diff_words->plus.text.ptr);
928 free (ecbdata->diff_words->plus.orig);
929 if (ecbdata->diff_words->word_regex) {
930 regfree(ecbdata->diff_words->word_regex);
931 free(ecbdata->diff_words->word_regex);
932 }
933 free(ecbdata->diff_words);
934 ecbdata->diff_words = NULL;
935 }
936 }
937
938 const char *diff_get_color(int diff_use_color, enum color_diff ix)
939 {
940 if (diff_use_color)
941 return diff_colors[ix];
942 return "";
943 }
944
945 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
946 {
947 const char *cp;
948 unsigned long allot;
949 size_t l = len;
950
951 if (ecb->truncate)
952 return ecb->truncate(line, len);
953 cp = line;
954 allot = l;
955 while (0 < l) {
956 (void) utf8_width(&cp, &l);
957 if (!cp)
958 break; /* truncated in the middle? */
959 }
960 return allot - l;
961 }
962
963 static void find_lno(const char *line, struct emit_callback *ecbdata)
964 {
965 const char *p;
966 ecbdata->lno_in_preimage = 0;
967 ecbdata->lno_in_postimage = 0;
968 p = strchr(line, '-');
969 if (!p)
970 return; /* cannot happen */
971 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
972 p = strchr(p, '+');
973 if (!p)
974 return; /* cannot happen */
975 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
976 }
977
978 static void fn_out_consume(void *priv, char *line, unsigned long len)
979 {
980 struct emit_callback *ecbdata = priv;
981 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
982 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
983 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
984 struct diff_options *o = ecbdata->opt;
985 char *line_prefix = "";
986 struct strbuf *msgbuf;
987
988 if (o && o->output_prefix) {
989 msgbuf = o->output_prefix(o, o->output_prefix_data);
990 line_prefix = msgbuf->buf;
991 }
992
993 if (ecbdata->header) {
994 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
995 strbuf_reset(ecbdata->header);
996 ecbdata->header = NULL;
997 }
998 *(ecbdata->found_changesp) = 1;
999
1000 if (ecbdata->label_path[0]) {
1001 const char *name_a_tab, *name_b_tab;
1002
1003 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1004 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1005
1006 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1007 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1008 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1009 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1010 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1011 }
1012
1013 if (diff_suppress_blank_empty
1014 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1015 line[0] = '\n';
1016 len = 1;
1017 }
1018
1019 if (line[0] == '@') {
1020 if (ecbdata->diff_words)
1021 diff_words_flush(ecbdata);
1022 len = sane_truncate_line(ecbdata, line, len);
1023 find_lno(line, ecbdata);
1024 emit_hunk_header(ecbdata, line, len);
1025 if (line[len-1] != '\n')
1026 putc('\n', ecbdata->opt->file);
1027 return;
1028 }
1029
1030 if (len < 1) {
1031 emit_line(ecbdata->opt, reset, reset, line, len);
1032 if (ecbdata->diff_words
1033 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1034 fputs("~\n", ecbdata->opt->file);
1035 return;
1036 }
1037
1038 if (ecbdata->diff_words) {
1039 if (line[0] == '-') {
1040 diff_words_append(line, len,
1041 &ecbdata->diff_words->minus);
1042 return;
1043 } else if (line[0] == '+') {
1044 diff_words_append(line, len,
1045 &ecbdata->diff_words->plus);
1046 return;
1047 }
1048 diff_words_flush(ecbdata);
1049 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1050 emit_line(ecbdata->opt, plain, reset, line, len);
1051 fputs("~\n", ecbdata->opt->file);
1052 } else {
1053 /* don't print the prefix character */
1054 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1055 }
1056 return;
1057 }
1058
1059 if (line[0] != '+') {
1060 const char *color =
1061 diff_get_color(ecbdata->color_diff,
1062 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1063 ecbdata->lno_in_preimage++;
1064 if (line[0] == ' ')
1065 ecbdata->lno_in_postimage++;
1066 emit_line(ecbdata->opt, color, reset, line, len);
1067 } else {
1068 ecbdata->lno_in_postimage++;
1069 emit_add_line(reset, ecbdata, line + 1, len - 1);
1070 }
1071 }
1072
1073 static char *pprint_rename(const char *a, const char *b)
1074 {
1075 const char *old = a;
1076 const char *new = b;
1077 struct strbuf name = STRBUF_INIT;
1078 int pfx_length, sfx_length;
1079 int len_a = strlen(a);
1080 int len_b = strlen(b);
1081 int a_midlen, b_midlen;
1082 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1083 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1084
1085 if (qlen_a || qlen_b) {
1086 quote_c_style(a, &name, NULL, 0);
1087 strbuf_addstr(&name, " => ");
1088 quote_c_style(b, &name, NULL, 0);
1089 return strbuf_detach(&name, NULL);
1090 }
1091
1092 /* Find common prefix */
1093 pfx_length = 0;
1094 while (*old && *new && *old == *new) {
1095 if (*old == '/')
1096 pfx_length = old - a + 1;
1097 old++;
1098 new++;
1099 }
1100
1101 /* Find common suffix */
1102 old = a + len_a;
1103 new = b + len_b;
1104 sfx_length = 0;
1105 while (a <= old && b <= new && *old == *new) {
1106 if (*old == '/')
1107 sfx_length = len_a - (old - a);
1108 old--;
1109 new--;
1110 }
1111
1112 /*
1113 * pfx{mid-a => mid-b}sfx
1114 * {pfx-a => pfx-b}sfx
1115 * pfx{sfx-a => sfx-b}
1116 * name-a => name-b
1117 */
1118 a_midlen = len_a - pfx_length - sfx_length;
1119 b_midlen = len_b - pfx_length - sfx_length;
1120 if (a_midlen < 0)
1121 a_midlen = 0;
1122 if (b_midlen < 0)
1123 b_midlen = 0;
1124
1125 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1126 if (pfx_length + sfx_length) {
1127 strbuf_add(&name, a, pfx_length);
1128 strbuf_addch(&name, '{');
1129 }
1130 strbuf_add(&name, a + pfx_length, a_midlen);
1131 strbuf_addstr(&name, " => ");
1132 strbuf_add(&name, b + pfx_length, b_midlen);
1133 if (pfx_length + sfx_length) {
1134 strbuf_addch(&name, '}');
1135 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1136 }
1137 return strbuf_detach(&name, NULL);
1138 }
1139
1140 struct diffstat_t {
1141 int nr;
1142 int alloc;
1143 struct diffstat_file {
1144 char *from_name;
1145 char *name;
1146 char *print_name;
1147 unsigned is_unmerged:1;
1148 unsigned is_binary:1;
1149 unsigned is_renamed:1;
1150 uintmax_t added, deleted;
1151 } **files;
1152 };
1153
1154 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1155 const char *name_a,
1156 const char *name_b)
1157 {
1158 struct diffstat_file *x;
1159 x = xcalloc(sizeof (*x), 1);
1160 if (diffstat->nr == diffstat->alloc) {
1161 diffstat->alloc = alloc_nr(diffstat->alloc);
1162 diffstat->files = xrealloc(diffstat->files,
1163 diffstat->alloc * sizeof(x));
1164 }
1165 diffstat->files[diffstat->nr++] = x;
1166 if (name_b) {
1167 x->from_name = xstrdup(name_a);
1168 x->name = xstrdup(name_b);
1169 x->is_renamed = 1;
1170 }
1171 else {
1172 x->from_name = NULL;
1173 x->name = xstrdup(name_a);
1174 }
1175 return x;
1176 }
1177
1178 static void diffstat_consume(void *priv, char *line, unsigned long len)
1179 {
1180 struct diffstat_t *diffstat = priv;
1181 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1182
1183 if (line[0] == '+')
1184 x->added++;
1185 else if (line[0] == '-')
1186 x->deleted++;
1187 }
1188
1189 const char mime_boundary_leader[] = "------------";
1190
1191 static int scale_linear(int it, int width, int max_change)
1192 {
1193 /*
1194 * make sure that at least one '-' is printed if there were deletions,
1195 * and likewise for '+'.
1196 */
1197 if (max_change < 2)
1198 return it;
1199 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1200 }
1201
1202 static void show_name(FILE *file,
1203 const char *prefix, const char *name, int len)
1204 {
1205 fprintf(file, " %s%-*s |", prefix, len, name);
1206 }
1207
1208 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1209 {
1210 if (cnt <= 0)
1211 return;
1212 fprintf(file, "%s", set);
1213 while (cnt--)
1214 putc(ch, file);
1215 fprintf(file, "%s", reset);
1216 }
1217
1218 static void fill_print_name(struct diffstat_file *file)
1219 {
1220 char *pname;
1221
1222 if (file->print_name)
1223 return;
1224
1225 if (!file->is_renamed) {
1226 struct strbuf buf = STRBUF_INIT;
1227 if (quote_c_style(file->name, &buf, NULL, 0)) {
1228 pname = strbuf_detach(&buf, NULL);
1229 } else {
1230 pname = file->name;
1231 strbuf_release(&buf);
1232 }
1233 } else {
1234 pname = pprint_rename(file->from_name, file->name);
1235 }
1236 file->print_name = pname;
1237 }
1238
1239 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1240 {
1241 int i, len, add, del, adds = 0, dels = 0;
1242 uintmax_t max_change = 0, max_len = 0;
1243 int total_files = data->nr;
1244 int width, name_width;
1245 const char *reset, *set, *add_c, *del_c;
1246 const char *line_prefix = "";
1247 struct strbuf *msg = NULL;
1248
1249 if (data->nr == 0)
1250 return;
1251
1252 if (options->output_prefix) {
1253 msg = options->output_prefix(options, options->output_prefix_data);
1254 line_prefix = msg->buf;
1255 }
1256
1257 width = options->stat_width ? options->stat_width : 80;
1258 name_width = options->stat_name_width ? options->stat_name_width : 50;
1259
1260 /* Sanity: give at least 5 columns to the graph,
1261 * but leave at least 10 columns for the name.
1262 */
1263 if (width < 25)
1264 width = 25;
1265 if (name_width < 10)
1266 name_width = 10;
1267 else if (width < name_width + 15)
1268 name_width = width - 15;
1269
1270 /* Find the longest filename and max number of changes */
1271 reset = diff_get_color_opt(options, DIFF_RESET);
1272 set = diff_get_color_opt(options, DIFF_PLAIN);
1273 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1274 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1275
1276 for (i = 0; i < data->nr; i++) {
1277 struct diffstat_file *file = data->files[i];
1278 uintmax_t change = file->added + file->deleted;
1279 fill_print_name(file);
1280 len = strlen(file->print_name);
1281 if (max_len < len)
1282 max_len = len;
1283
1284 if (file->is_binary || file->is_unmerged)
1285 continue;
1286 if (max_change < change)
1287 max_change = change;
1288 }
1289
1290 /* Compute the width of the graph part;
1291 * 10 is for one blank at the beginning of the line plus
1292 * " | count " between the name and the graph.
1293 *
1294 * From here on, name_width is the width of the name area,
1295 * and width is the width of the graph area.
1296 */
1297 name_width = (name_width < max_len) ? name_width : max_len;
1298 if (width < (name_width + 10) + max_change)
1299 width = width - (name_width + 10);
1300 else
1301 width = max_change;
1302
1303 for (i = 0; i < data->nr; i++) {
1304 const char *prefix = "";
1305 char *name = data->files[i]->print_name;
1306 uintmax_t added = data->files[i]->added;
1307 uintmax_t deleted = data->files[i]->deleted;
1308 int name_len;
1309
1310 /*
1311 * "scale" the filename
1312 */
1313 len = name_width;
1314 name_len = strlen(name);
1315 if (name_width < name_len) {
1316 char *slash;
1317 prefix = "...";
1318 len -= 3;
1319 name += name_len - len;
1320 slash = strchr(name, '/');
1321 if (slash)
1322 name = slash;
1323 }
1324
1325 if (data->files[i]->is_binary) {
1326 fprintf(options->file, "%s", line_prefix);
1327 show_name(options->file, prefix, name, len);
1328 fprintf(options->file, " Bin ");
1329 fprintf(options->file, "%s%"PRIuMAX"%s",
1330 del_c, deleted, reset);
1331 fprintf(options->file, " -> ");
1332 fprintf(options->file, "%s%"PRIuMAX"%s",
1333 add_c, added, reset);
1334 fprintf(options->file, " bytes");
1335 fprintf(options->file, "\n");
1336 continue;
1337 }
1338 else if (data->files[i]->is_unmerged) {
1339 fprintf(options->file, "%s", line_prefix);
1340 show_name(options->file, prefix, name, len);
1341 fprintf(options->file, " Unmerged\n");
1342 continue;
1343 }
1344 else if (!data->files[i]->is_renamed &&
1345 (added + deleted == 0)) {
1346 total_files--;
1347 continue;
1348 }
1349
1350 /*
1351 * scale the add/delete
1352 */
1353 add = added;
1354 del = deleted;
1355 adds += add;
1356 dels += del;
1357
1358 if (width <= max_change) {
1359 add = scale_linear(add, width, max_change);
1360 del = scale_linear(del, width, max_change);
1361 }
1362 fprintf(options->file, "%s", line_prefix);
1363 show_name(options->file, prefix, name, len);
1364 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1365 added + deleted ? " " : "");
1366 show_graph(options->file, '+', add, add_c, reset);
1367 show_graph(options->file, '-', del, del_c, reset);
1368 fprintf(options->file, "\n");
1369 }
1370 fprintf(options->file, "%s", line_prefix);
1371 fprintf(options->file,
1372 " %d files changed, %d insertions(+), %d deletions(-)\n",
1373 total_files, adds, dels);
1374 }
1375
1376 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1377 {
1378 int i, adds = 0, dels = 0, total_files = data->nr;
1379
1380 if (data->nr == 0)
1381 return;
1382
1383 for (i = 0; i < data->nr; i++) {
1384 if (!data->files[i]->is_binary &&
1385 !data->files[i]->is_unmerged) {
1386 int added = data->files[i]->added;
1387 int deleted= data->files[i]->deleted;
1388 if (!data->files[i]->is_renamed &&
1389 (added + deleted == 0)) {
1390 total_files--;
1391 } else {
1392 adds += added;
1393 dels += deleted;
1394 }
1395 }
1396 }
1397 if (options->output_prefix) {
1398 struct strbuf *msg = NULL;
1399 msg = options->output_prefix(options,
1400 options->output_prefix_data);
1401 fprintf(options->file, "%s", msg->buf);
1402 }
1403 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1404 total_files, adds, dels);
1405 }
1406
1407 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1408 {
1409 int i;
1410
1411 if (data->nr == 0)
1412 return;
1413
1414 for (i = 0; i < data->nr; i++) {
1415 struct diffstat_file *file = data->files[i];
1416
1417 if (options->output_prefix) {
1418 struct strbuf *msg = NULL;
1419 msg = options->output_prefix(options,
1420 options->output_prefix_data);
1421 fprintf(options->file, "%s", msg->buf);
1422 }
1423
1424 if (file->is_binary)
1425 fprintf(options->file, "-\t-\t");
1426 else
1427 fprintf(options->file,
1428 "%"PRIuMAX"\t%"PRIuMAX"\t",
1429 file->added, file->deleted);
1430 if (options->line_termination) {
1431 fill_print_name(file);
1432 if (!file->is_renamed)
1433 write_name_quoted(file->name, options->file,
1434 options->line_termination);
1435 else {
1436 fputs(file->print_name, options->file);
1437 putc(options->line_termination, options->file);
1438 }
1439 } else {
1440 if (file->is_renamed) {
1441 putc('\0', options->file);
1442 write_name_quoted(file->from_name, options->file, '\0');
1443 }
1444 write_name_quoted(file->name, options->file, '\0');
1445 }
1446 }
1447 }
1448
1449 struct dirstat_file {
1450 const char *name;
1451 unsigned long changed;
1452 };
1453
1454 struct dirstat_dir {
1455 struct dirstat_file *files;
1456 int alloc, nr, percent, cumulative;
1457 };
1458
1459 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1460 unsigned long changed, const char *base, int baselen)
1461 {
1462 unsigned long this_dir = 0;
1463 unsigned int sources = 0;
1464 const char *line_prefix = "";
1465 struct strbuf *msg = NULL;
1466
1467 if (opt->output_prefix) {
1468 msg = opt->output_prefix(opt, opt->output_prefix_data);
1469 line_prefix = msg->buf;
1470 }
1471
1472 while (dir->nr) {
1473 struct dirstat_file *f = dir->files;
1474 int namelen = strlen(f->name);
1475 unsigned long this;
1476 char *slash;
1477
1478 if (namelen < baselen)
1479 break;
1480 if (memcmp(f->name, base, baselen))
1481 break;
1482 slash = strchr(f->name + baselen, '/');
1483 if (slash) {
1484 int newbaselen = slash + 1 - f->name;
1485 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1486 sources++;
1487 } else {
1488 this = f->changed;
1489 dir->files++;
1490 dir->nr--;
1491 sources += 2;
1492 }
1493 this_dir += this;
1494 }
1495
1496 /*
1497 * We don't report dirstat's for
1498 * - the top level
1499 * - or cases where everything came from a single directory
1500 * under this directory (sources == 1).
1501 */
1502 if (baselen && sources != 1) {
1503 int permille = this_dir * 1000 / changed;
1504 if (permille) {
1505 int percent = permille / 10;
1506 if (percent >= dir->percent) {
1507 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1508 percent, permille % 10, baselen, base);
1509 if (!dir->cumulative)
1510 return 0;
1511 }
1512 }
1513 }
1514 return this_dir;
1515 }
1516
1517 static int dirstat_compare(const void *_a, const void *_b)
1518 {
1519 const struct dirstat_file *a = _a;
1520 const struct dirstat_file *b = _b;
1521 return strcmp(a->name, b->name);
1522 }
1523
1524 static void show_dirstat(struct diff_options *options)
1525 {
1526 int i;
1527 unsigned long changed;
1528 struct dirstat_dir dir;
1529 struct diff_queue_struct *q = &diff_queued_diff;
1530
1531 dir.files = NULL;
1532 dir.alloc = 0;
1533 dir.nr = 0;
1534 dir.percent = options->dirstat_percent;
1535 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1536
1537 changed = 0;
1538 for (i = 0; i < q->nr; i++) {
1539 struct diff_filepair *p = q->queue[i];
1540 const char *name;
1541 unsigned long copied, added, damage;
1542
1543 name = p->one->path ? p->one->path : p->two->path;
1544
1545 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1546 diff_populate_filespec(p->one, 0);
1547 diff_populate_filespec(p->two, 0);
1548 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1549 &copied, &added);
1550 diff_free_filespec_data(p->one);
1551 diff_free_filespec_data(p->two);
1552 } else if (DIFF_FILE_VALID(p->one)) {
1553 diff_populate_filespec(p->one, 1);
1554 copied = added = 0;
1555 diff_free_filespec_data(p->one);
1556 } else if (DIFF_FILE_VALID(p->two)) {
1557 diff_populate_filespec(p->two, 1);
1558 copied = 0;
1559 added = p->two->size;
1560 diff_free_filespec_data(p->two);
1561 } else
1562 continue;
1563
1564 /*
1565 * Original minus copied is the removed material,
1566 * added is the new material. They are both damages
1567 * made to the preimage. In --dirstat-by-file mode, count
1568 * damaged files, not damaged lines. This is done by
1569 * counting only a single damaged line per file.
1570 */
1571 damage = (p->one->size - copied) + added;
1572 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1573 damage = 1;
1574
1575 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1576 dir.files[dir.nr].name = name;
1577 dir.files[dir.nr].changed = damage;
1578 changed += damage;
1579 dir.nr++;
1580 }
1581
1582 /* This can happen even with many files, if everything was renames */
1583 if (!changed)
1584 return;
1585
1586 /* Show all directories with more than x% of the changes */
1587 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1588 gather_dirstat(options, &dir, changed, "", 0);
1589 }
1590
1591 static void free_diffstat_info(struct diffstat_t *diffstat)
1592 {
1593 int i;
1594 for (i = 0; i < diffstat->nr; i++) {
1595 struct diffstat_file *f = diffstat->files[i];
1596 if (f->name != f->print_name)
1597 free(f->print_name);
1598 free(f->name);
1599 free(f->from_name);
1600 free(f);
1601 }
1602 free(diffstat->files);
1603 }
1604
1605 struct checkdiff_t {
1606 const char *filename;
1607 int lineno;
1608 int conflict_marker_size;
1609 struct diff_options *o;
1610 unsigned ws_rule;
1611 unsigned status;
1612 };
1613
1614 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1615 {
1616 char firstchar;
1617 int cnt;
1618
1619 if (len < marker_size + 1)
1620 return 0;
1621 firstchar = line[0];
1622 switch (firstchar) {
1623 case '=': case '>': case '<': case '|':
1624 break;
1625 default:
1626 return 0;
1627 }
1628 for (cnt = 1; cnt < marker_size; cnt++)
1629 if (line[cnt] != firstchar)
1630 return 0;
1631 /* line[1] thru line[marker_size-1] are same as firstchar */
1632 if (len < marker_size + 1 || !isspace(line[marker_size]))
1633 return 0;
1634 return 1;
1635 }
1636
1637 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1638 {
1639 struct checkdiff_t *data = priv;
1640 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1641 int marker_size = data->conflict_marker_size;
1642 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1643 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1644 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1645 char *err;
1646 char *line_prefix = "";
1647 struct strbuf *msgbuf;
1648
1649 assert(data->o);
1650 if (data->o->output_prefix) {
1651 msgbuf = data->o->output_prefix(data->o,
1652 data->o->output_prefix_data);
1653 line_prefix = msgbuf->buf;
1654 }
1655
1656 if (line[0] == '+') {
1657 unsigned bad;
1658 data->lineno++;
1659 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1660 data->status |= 1;
1661 fprintf(data->o->file,
1662 "%s%s:%d: leftover conflict marker\n",
1663 line_prefix, data->filename, data->lineno);
1664 }
1665 bad = ws_check(line + 1, len - 1, data->ws_rule);
1666 if (!bad)
1667 return;
1668 data->status |= bad;
1669 err = whitespace_error_string(bad);
1670 fprintf(data->o->file, "%s%s:%d: %s.\n",
1671 line_prefix, data->filename, data->lineno, err);
1672 free(err);
1673 emit_line(data->o, set, reset, line, 1);
1674 ws_check_emit(line + 1, len - 1, data->ws_rule,
1675 data->o->file, set, reset, ws);
1676 } else if (line[0] == ' ') {
1677 data->lineno++;
1678 } else if (line[0] == '@') {
1679 char *plus = strchr(line, '+');
1680 if (plus)
1681 data->lineno = strtol(plus, NULL, 10) - 1;
1682 else
1683 die("invalid diff");
1684 }
1685 }
1686
1687 static unsigned char *deflate_it(char *data,
1688 unsigned long size,
1689 unsigned long *result_size)
1690 {
1691 int bound;
1692 unsigned char *deflated;
1693 z_stream stream;
1694
1695 memset(&stream, 0, sizeof(stream));
1696 deflateInit(&stream, zlib_compression_level);
1697 bound = deflateBound(&stream, size);
1698 deflated = xmalloc(bound);
1699 stream.next_out = deflated;
1700 stream.avail_out = bound;
1701
1702 stream.next_in = (unsigned char *)data;
1703 stream.avail_in = size;
1704 while (deflate(&stream, Z_FINISH) == Z_OK)
1705 ; /* nothing */
1706 deflateEnd(&stream);
1707 *result_size = stream.total_out;
1708 return deflated;
1709 }
1710
1711 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1712 {
1713 void *cp;
1714 void *delta;
1715 void *deflated;
1716 void *data;
1717 unsigned long orig_size;
1718 unsigned long delta_size;
1719 unsigned long deflate_size;
1720 unsigned long data_size;
1721
1722 /* We could do deflated delta, or we could do just deflated two,
1723 * whichever is smaller.
1724 */
1725 delta = NULL;
1726 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1727 if (one->size && two->size) {
1728 delta = diff_delta(one->ptr, one->size,
1729 two->ptr, two->size,
1730 &delta_size, deflate_size);
1731 if (delta) {
1732 void *to_free = delta;
1733 orig_size = delta_size;
1734 delta = deflate_it(delta, delta_size, &delta_size);
1735 free(to_free);
1736 }
1737 }
1738
1739 if (delta && delta_size < deflate_size) {
1740 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1741 free(deflated);
1742 data = delta;
1743 data_size = delta_size;
1744 }
1745 else {
1746 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1747 free(delta);
1748 data = deflated;
1749 data_size = deflate_size;
1750 }
1751
1752 /* emit data encoded in base85 */
1753 cp = data;
1754 while (data_size) {
1755 int bytes = (52 < data_size) ? 52 : data_size;
1756 char line[70];
1757 data_size -= bytes;
1758 if (bytes <= 26)
1759 line[0] = bytes + 'A' - 1;
1760 else
1761 line[0] = bytes - 26 + 'a' - 1;
1762 encode_85(line + 1, cp, bytes);
1763 cp = (char *) cp + bytes;
1764 fprintf(file, "%s", prefix);
1765 fputs(line, file);
1766 fputc('\n', file);
1767 }
1768 fprintf(file, "%s\n", prefix);
1769 free(data);
1770 }
1771
1772 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1773 {
1774 fprintf(file, "%sGIT binary patch\n", prefix);
1775 emit_binary_diff_body(file, one, two, prefix);
1776 emit_binary_diff_body(file, two, one, prefix);
1777 }
1778
1779 static void diff_filespec_load_driver(struct diff_filespec *one)
1780 {
1781 /* Use already-loaded driver */
1782 if (one->driver)
1783 return;
1784
1785 if (S_ISREG(one->mode))
1786 one->driver = userdiff_find_by_path(one->path);
1787
1788 /* Fallback to default settings */
1789 if (!one->driver)
1790 one->driver = userdiff_find_by_name("default");
1791 }
1792
1793 int diff_filespec_is_binary(struct diff_filespec *one)
1794 {
1795 if (one->is_binary == -1) {
1796 diff_filespec_load_driver(one);
1797 if (one->driver->binary != -1)
1798 one->is_binary = one->driver->binary;
1799 else {
1800 if (!one->data && DIFF_FILE_VALID(one))
1801 diff_populate_filespec(one, 0);
1802 if (one->data)
1803 one->is_binary = buffer_is_binary(one->data,
1804 one->size);
1805 if (one->is_binary == -1)
1806 one->is_binary = 0;
1807 }
1808 }
1809 return one->is_binary;
1810 }
1811
1812 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1813 {
1814 diff_filespec_load_driver(one);
1815 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1816 }
1817
1818 static const char *userdiff_word_regex(struct diff_filespec *one)
1819 {
1820 diff_filespec_load_driver(one);
1821 return one->driver->word_regex;
1822 }
1823
1824 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1825 {
1826 if (!options->a_prefix)
1827 options->a_prefix = a;
1828 if (!options->b_prefix)
1829 options->b_prefix = b;
1830 }
1831
1832 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1833 {
1834 if (!DIFF_FILE_VALID(one))
1835 return NULL;
1836
1837 diff_filespec_load_driver(one);
1838 if (!one->driver->textconv)
1839 return NULL;
1840
1841 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1842 struct notes_cache *c = xmalloc(sizeof(*c));
1843 struct strbuf name = STRBUF_INIT;
1844
1845 strbuf_addf(&name, "textconv/%s", one->driver->name);
1846 notes_cache_init(c, name.buf, one->driver->textconv);
1847 one->driver->textconv_cache = c;
1848 }
1849
1850 return one->driver;
1851 }
1852
1853 static void builtin_diff(const char *name_a,
1854 const char *name_b,
1855 struct diff_filespec *one,
1856 struct diff_filespec *two,
1857 const char *xfrm_msg,
1858 int must_show_header,
1859 struct diff_options *o,
1860 int complete_rewrite)
1861 {
1862 mmfile_t mf1, mf2;
1863 const char *lbl[2];
1864 char *a_one, *b_two;
1865 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1866 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1867 const char *a_prefix, *b_prefix;
1868 struct userdiff_driver *textconv_one = NULL;
1869 struct userdiff_driver *textconv_two = NULL;
1870 struct strbuf header = STRBUF_INIT;
1871 struct strbuf *msgbuf;
1872 char *line_prefix = "";
1873
1874 if (o->output_prefix) {
1875 msgbuf = o->output_prefix(o, o->output_prefix_data);
1876 line_prefix = msgbuf->buf;
1877 }
1878
1879 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1880 (!one->mode || S_ISGITLINK(one->mode)) &&
1881 (!two->mode || S_ISGITLINK(two->mode))) {
1882 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1883 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1884 show_submodule_summary(o->file, one ? one->path : two->path,
1885 one->sha1, two->sha1, two->dirty_submodule,
1886 del, add, reset);
1887 return;
1888 }
1889
1890 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1891 textconv_one = get_textconv(one);
1892 textconv_two = get_textconv(two);
1893 }
1894
1895 diff_set_mnemonic_prefix(o, "a/", "b/");
1896 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1897 a_prefix = o->b_prefix;
1898 b_prefix = o->a_prefix;
1899 } else {
1900 a_prefix = o->a_prefix;
1901 b_prefix = o->b_prefix;
1902 }
1903
1904 /* Never use a non-valid filename anywhere if at all possible */
1905 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1906 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1907
1908 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1909 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1910 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1911 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1912 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1913 if (lbl[0][0] == '/') {
1914 /* /dev/null */
1915 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1916 if (xfrm_msg)
1917 strbuf_addstr(&header, xfrm_msg);
1918 must_show_header = 1;
1919 }
1920 else if (lbl[1][0] == '/') {
1921 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1922 if (xfrm_msg)
1923 strbuf_addstr(&header, xfrm_msg);
1924 must_show_header = 1;
1925 }
1926 else {
1927 if (one->mode != two->mode) {
1928 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1929 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1930 must_show_header = 1;
1931 }
1932 if (xfrm_msg)
1933 strbuf_addstr(&header, xfrm_msg);
1934
1935 /*
1936 * we do not run diff between different kind
1937 * of objects.
1938 */
1939 if ((one->mode ^ two->mode) & S_IFMT)
1940 goto free_ab_and_return;
1941 if (complete_rewrite &&
1942 (textconv_one || !diff_filespec_is_binary(one)) &&
1943 (textconv_two || !diff_filespec_is_binary(two))) {
1944 fprintf(o->file, "%s", header.buf);
1945 strbuf_reset(&header);
1946 emit_rewrite_diff(name_a, name_b, one, two,
1947 textconv_one, textconv_two, o);
1948 o->found_changes = 1;
1949 goto free_ab_and_return;
1950 }
1951 }
1952
1953 if (!DIFF_OPT_TST(o, TEXT) &&
1954 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1955 (!textconv_two && diff_filespec_is_binary(two)) )) {
1956 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1957 die("unable to read files to diff");
1958 /* Quite common confusing case */
1959 if (mf1.size == mf2.size &&
1960 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1961 if (must_show_header)
1962 fprintf(o->file, "%s", header.buf);
1963 goto free_ab_and_return;
1964 }
1965 fprintf(o->file, "%s", header.buf);
1966 strbuf_reset(&header);
1967 if (DIFF_OPT_TST(o, BINARY))
1968 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
1969 else
1970 fprintf(o->file, "%sBinary files %s and %s differ\n",
1971 line_prefix, lbl[0], lbl[1]);
1972 o->found_changes = 1;
1973 }
1974 else {
1975 /* Crazy xdl interfaces.. */
1976 const char *diffopts = getenv("GIT_DIFF_OPTS");
1977 xpparam_t xpp;
1978 xdemitconf_t xecfg;
1979 struct emit_callback ecbdata;
1980 const struct userdiff_funcname *pe;
1981
1982 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1983 fprintf(o->file, "%s", header.buf);
1984 strbuf_reset(&header);
1985 }
1986
1987 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1988 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
1989
1990 pe = diff_funcname_pattern(one);
1991 if (!pe)
1992 pe = diff_funcname_pattern(two);
1993
1994 memset(&xpp, 0, sizeof(xpp));
1995 memset(&xecfg, 0, sizeof(xecfg));
1996 memset(&ecbdata, 0, sizeof(ecbdata));
1997 ecbdata.label_path = lbl;
1998 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1999 ecbdata.found_changesp = &o->found_changes;
2000 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2001 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2002 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2003 ecbdata.opt = o;
2004 ecbdata.header = header.len ? &header : NULL;
2005 xpp.flags = o->xdl_opts;
2006 xecfg.ctxlen = o->context;
2007 xecfg.interhunkctxlen = o->interhunkcontext;
2008 xecfg.flags = XDL_EMIT_FUNCNAMES;
2009 if (pe)
2010 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2011 if (!diffopts)
2012 ;
2013 else if (!prefixcmp(diffopts, "--unified="))
2014 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2015 else if (!prefixcmp(diffopts, "-u"))
2016 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2017 if (o->word_diff) {
2018 int i;
2019
2020 ecbdata.diff_words =
2021 xcalloc(1, sizeof(struct diff_words_data));
2022 ecbdata.diff_words->type = o->word_diff;
2023 ecbdata.diff_words->opt = o;
2024 if (!o->word_regex)
2025 o->word_regex = userdiff_word_regex(one);
2026 if (!o->word_regex)
2027 o->word_regex = userdiff_word_regex(two);
2028 if (!o->word_regex)
2029 o->word_regex = diff_word_regex_cfg;
2030 if (o->word_regex) {
2031 ecbdata.diff_words->word_regex = (regex_t *)
2032 xmalloc(sizeof(regex_t));
2033 if (regcomp(ecbdata.diff_words->word_regex,
2034 o->word_regex,
2035 REG_EXTENDED | REG_NEWLINE))
2036 die ("Invalid regular expression: %s",
2037 o->word_regex);
2038 }
2039 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2040 if (o->word_diff == diff_words_styles[i].type) {
2041 ecbdata.diff_words->style =
2042 &diff_words_styles[i];
2043 break;
2044 }
2045 }
2046 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2047 struct diff_words_style *st = ecbdata.diff_words->style;
2048 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2049 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2050 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2051 }
2052 }
2053 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2054 &xpp, &xecfg);
2055 if (o->word_diff)
2056 free_diff_words_data(&ecbdata);
2057 if (textconv_one)
2058 free(mf1.ptr);
2059 if (textconv_two)
2060 free(mf2.ptr);
2061 xdiff_clear_find_func(&xecfg);
2062 }
2063
2064 free_ab_and_return:
2065 strbuf_release(&header);
2066 diff_free_filespec_data(one);
2067 diff_free_filespec_data(two);
2068 free(a_one);
2069 free(b_two);
2070 return;
2071 }
2072
2073 static void builtin_diffstat(const char *name_a, const char *name_b,
2074 struct diff_filespec *one,
2075 struct diff_filespec *two,
2076 struct diffstat_t *diffstat,
2077 struct diff_options *o,
2078 int complete_rewrite)
2079 {
2080 mmfile_t mf1, mf2;
2081 struct diffstat_file *data;
2082
2083 data = diffstat_add(diffstat, name_a, name_b);
2084
2085 if (!one || !two) {
2086 data->is_unmerged = 1;
2087 return;
2088 }
2089
2090 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2091 data->is_binary = 1;
2092 data->added = diff_filespec_size(two);
2093 data->deleted = diff_filespec_size(one);
2094 }
2095
2096 else if (complete_rewrite) {
2097 diff_populate_filespec(one, 0);
2098 diff_populate_filespec(two, 0);
2099 data->deleted = count_lines(one->data, one->size);
2100 data->added = count_lines(two->data, two->size);
2101 }
2102
2103 else {
2104 /* Crazy xdl interfaces.. */
2105 xpparam_t xpp;
2106 xdemitconf_t xecfg;
2107
2108 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2109 die("unable to read files to diff");
2110
2111 memset(&xpp, 0, sizeof(xpp));
2112 memset(&xecfg, 0, sizeof(xecfg));
2113 xpp.flags = o->xdl_opts;
2114 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2115 &xpp, &xecfg);
2116 }
2117
2118 diff_free_filespec_data(one);
2119 diff_free_filespec_data(two);
2120 }
2121
2122 static void builtin_checkdiff(const char *name_a, const char *name_b,
2123 const char *attr_path,
2124 struct diff_filespec *one,
2125 struct diff_filespec *two,
2126 struct diff_options *o)
2127 {
2128 mmfile_t mf1, mf2;
2129 struct checkdiff_t data;
2130
2131 if (!two)
2132 return;
2133
2134 memset(&data, 0, sizeof(data));
2135 data.filename = name_b ? name_b : name_a;
2136 data.lineno = 0;
2137 data.o = o;
2138 data.ws_rule = whitespace_rule(attr_path);
2139 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2140
2141 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2142 die("unable to read files to diff");
2143
2144 /*
2145 * All the other codepaths check both sides, but not checking
2146 * the "old" side here is deliberate. We are checking the newly
2147 * introduced changes, and as long as the "new" side is text, we
2148 * can and should check what it introduces.
2149 */
2150 if (diff_filespec_is_binary(two))
2151 goto free_and_return;
2152 else {
2153 /* Crazy xdl interfaces.. */
2154 xpparam_t xpp;
2155 xdemitconf_t xecfg;
2156
2157 memset(&xpp, 0, sizeof(xpp));
2158 memset(&xecfg, 0, sizeof(xecfg));
2159 xecfg.ctxlen = 1; /* at least one context line */
2160 xpp.flags = 0;
2161 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2162 &xpp, &xecfg);
2163
2164 if (data.ws_rule & WS_BLANK_AT_EOF) {
2165 struct emit_callback ecbdata;
2166 int blank_at_eof;
2167
2168 ecbdata.ws_rule = data.ws_rule;
2169 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2170 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2171
2172 if (blank_at_eof) {
2173 static char *err;
2174 if (!err)
2175 err = whitespace_error_string(WS_BLANK_AT_EOF);
2176 fprintf(o->file, "%s:%d: %s.\n",
2177 data.filename, blank_at_eof, err);
2178 data.status = 1; /* report errors */
2179 }
2180 }
2181 }
2182 free_and_return:
2183 diff_free_filespec_data(one);
2184 diff_free_filespec_data(two);
2185 if (data.status)
2186 DIFF_OPT_SET(o, CHECK_FAILED);
2187 }
2188
2189 struct diff_filespec *alloc_filespec(const char *path)
2190 {
2191 int namelen = strlen(path);
2192 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2193
2194 memset(spec, 0, sizeof(*spec));
2195 spec->path = (char *)(spec + 1);
2196 memcpy(spec->path, path, namelen+1);
2197 spec->count = 1;
2198 spec->is_binary = -1;
2199 return spec;
2200 }
2201
2202 void free_filespec(struct diff_filespec *spec)
2203 {
2204 if (!--spec->count) {
2205 diff_free_filespec_data(spec);
2206 free(spec);
2207 }
2208 }
2209
2210 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2211 unsigned short mode)
2212 {
2213 if (mode) {
2214 spec->mode = canon_mode(mode);
2215 hashcpy(spec->sha1, sha1);
2216 spec->sha1_valid = !is_null_sha1(sha1);
2217 }
2218 }
2219
2220 /*
2221 * Given a name and sha1 pair, if the index tells us the file in
2222 * the work tree has that object contents, return true, so that
2223 * prepare_temp_file() does not have to inflate and extract.
2224 */
2225 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2226 {
2227 struct cache_entry *ce;
2228 struct stat st;
2229 int pos, len;
2230
2231 /*
2232 * We do not read the cache ourselves here, because the
2233 * benchmark with my previous version that always reads cache
2234 * shows that it makes things worse for diff-tree comparing
2235 * two linux-2.6 kernel trees in an already checked out work
2236 * tree. This is because most diff-tree comparisons deal with
2237 * only a small number of files, while reading the cache is
2238 * expensive for a large project, and its cost outweighs the
2239 * savings we get by not inflating the object to a temporary
2240 * file. Practically, this code only helps when we are used
2241 * by diff-cache --cached, which does read the cache before
2242 * calling us.
2243 */
2244 if (!active_cache)
2245 return 0;
2246
2247 /* We want to avoid the working directory if our caller
2248 * doesn't need the data in a normal file, this system
2249 * is rather slow with its stat/open/mmap/close syscalls,
2250 * and the object is contained in a pack file. The pack
2251 * is probably already open and will be faster to obtain
2252 * the data through than the working directory. Loose
2253 * objects however would tend to be slower as they need
2254 * to be individually opened and inflated.
2255 */
2256 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2257 return 0;
2258
2259 len = strlen(name);
2260 pos = cache_name_pos(name, len);
2261 if (pos < 0)
2262 return 0;
2263 ce = active_cache[pos];
2264
2265 /*
2266 * This is not the sha1 we are looking for, or
2267 * unreusable because it is not a regular file.
2268 */
2269 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2270 return 0;
2271
2272 /*
2273 * If ce is marked as "assume unchanged", there is no
2274 * guarantee that work tree matches what we are looking for.
2275 */
2276 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2277 return 0;
2278
2279 /*
2280 * If ce matches the file in the work tree, we can reuse it.
2281 */
2282 if (ce_uptodate(ce) ||
2283 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2284 return 1;
2285
2286 return 0;
2287 }
2288
2289 static int populate_from_stdin(struct diff_filespec *s)
2290 {
2291 struct strbuf buf = STRBUF_INIT;
2292 size_t size = 0;
2293
2294 if (strbuf_read(&buf, 0, 0) < 0)
2295 return error("error while reading from stdin %s",
2296 strerror(errno));
2297
2298 s->should_munmap = 0;
2299 s->data = strbuf_detach(&buf, &size);
2300 s->size = size;
2301 s->should_free = 1;
2302 return 0;
2303 }
2304
2305 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2306 {
2307 int len;
2308 char *data = xmalloc(100), *dirty = "";
2309
2310 /* Are we looking at the work tree? */
2311 if (s->dirty_submodule)
2312 dirty = "-dirty";
2313
2314 len = snprintf(data, 100,
2315 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2316 s->data = data;
2317 s->size = len;
2318 s->should_free = 1;
2319 if (size_only) {
2320 s->data = NULL;
2321 free(data);
2322 }
2323 return 0;
2324 }
2325
2326 /*
2327 * While doing rename detection and pickaxe operation, we may need to
2328 * grab the data for the blob (or file) for our own in-core comparison.
2329 * diff_filespec has data and size fields for this purpose.
2330 */
2331 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2332 {
2333 int err = 0;
2334 if (!DIFF_FILE_VALID(s))
2335 die("internal error: asking to populate invalid file.");
2336 if (S_ISDIR(s->mode))
2337 return -1;
2338
2339 if (s->data)
2340 return 0;
2341
2342 if (size_only && 0 < s->size)
2343 return 0;
2344
2345 if (S_ISGITLINK(s->mode))
2346 return diff_populate_gitlink(s, size_only);
2347
2348 if (!s->sha1_valid ||
2349 reuse_worktree_file(s->path, s->sha1, 0)) {
2350 struct strbuf buf = STRBUF_INIT;
2351 struct stat st;
2352 int fd;
2353
2354 if (!strcmp(s->path, "-"))
2355 return populate_from_stdin(s);
2356
2357 if (lstat(s->path, &st) < 0) {
2358 if (errno == ENOENT) {
2359 err_empty:
2360 err = -1;
2361 empty:
2362 s->data = (char *)"";
2363 s->size = 0;
2364 return err;
2365 }
2366 }
2367 s->size = xsize_t(st.st_size);
2368 if (!s->size)
2369 goto empty;
2370 if (S_ISLNK(st.st_mode)) {
2371 struct strbuf sb = STRBUF_INIT;
2372
2373 if (strbuf_readlink(&sb, s->path, s->size))
2374 goto err_empty;
2375 s->size = sb.len;
2376 s->data = strbuf_detach(&sb, NULL);
2377 s->should_free = 1;
2378 return 0;
2379 }
2380 if (size_only)
2381 return 0;
2382 fd = open(s->path, O_RDONLY);
2383 if (fd < 0)
2384 goto err_empty;
2385 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2386 close(fd);
2387 s->should_munmap = 1;
2388
2389 /*
2390 * Convert from working tree format to canonical git format
2391 */
2392 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2393 size_t size = 0;
2394 munmap(s->data, s->size);
2395 s->should_munmap = 0;
2396 s->data = strbuf_detach(&buf, &size);
2397 s->size = size;
2398 s->should_free = 1;
2399 }
2400 }
2401 else {
2402 enum object_type type;
2403 if (size_only) {
2404 type = sha1_object_info(s->sha1, &s->size);
2405 if (type < 0)
2406 die("unable to read %s", sha1_to_hex(s->sha1));
2407 } else {
2408 s->data = read_sha1_file(s->sha1, &type, &s->size);
2409 if (!s->data)
2410 die("unable to read %s", sha1_to_hex(s->sha1));
2411 s->should_free = 1;
2412 }
2413 }
2414 return 0;
2415 }
2416
2417 void diff_free_filespec_blob(struct diff_filespec *s)
2418 {
2419 if (s->should_free)
2420 free(s->data);
2421 else if (s->should_munmap)
2422 munmap(s->data, s->size);
2423
2424 if (s->should_free || s->should_munmap) {
2425 s->should_free = s->should_munmap = 0;
2426 s->data = NULL;
2427 }
2428 }
2429
2430 void diff_free_filespec_data(struct diff_filespec *s)
2431 {
2432 diff_free_filespec_blob(s);
2433 free(s->cnt_data);
2434 s->cnt_data = NULL;
2435 }
2436
2437 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2438 void *blob,
2439 unsigned long size,
2440 const unsigned char *sha1,
2441 int mode)
2442 {
2443 int fd;
2444 struct strbuf buf = STRBUF_INIT;
2445 struct strbuf template = STRBUF_INIT;
2446 char *path_dup = xstrdup(path);
2447 const char *base = basename(path_dup);
2448
2449 /* Generate "XXXXXX_basename.ext" */
2450 strbuf_addstr(&template, "XXXXXX_");
2451 strbuf_addstr(&template, base);
2452
2453 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2454 strlen(base) + 1);
2455 if (fd < 0)
2456 die_errno("unable to create temp-file");
2457 if (convert_to_working_tree(path,
2458 (const char *)blob, (size_t)size, &buf)) {
2459 blob = buf.buf;
2460 size = buf.len;
2461 }
2462 if (write_in_full(fd, blob, size) != size)
2463 die_errno("unable to write temp-file");
2464 close(fd);
2465 temp->name = temp->tmp_path;
2466 strcpy(temp->hex, sha1_to_hex(sha1));
2467 temp->hex[40] = 0;
2468 sprintf(temp->mode, "%06o", mode);
2469 strbuf_release(&buf);
2470 strbuf_release(&template);
2471 free(path_dup);
2472 }
2473
2474 static struct diff_tempfile *prepare_temp_file(const char *name,
2475 struct diff_filespec *one)
2476 {
2477 struct diff_tempfile *temp = claim_diff_tempfile();
2478
2479 if (!DIFF_FILE_VALID(one)) {
2480 not_a_valid_file:
2481 /* A '-' entry produces this for file-2, and
2482 * a '+' entry produces this for file-1.
2483 */
2484 temp->name = "/dev/null";
2485 strcpy(temp->hex, ".");
2486 strcpy(temp->mode, ".");
2487 return temp;
2488 }
2489
2490 if (!remove_tempfile_installed) {
2491 atexit(remove_tempfile);
2492 sigchain_push_common(remove_tempfile_on_signal);
2493 remove_tempfile_installed = 1;
2494 }
2495
2496 if (!one->sha1_valid ||
2497 reuse_worktree_file(name, one->sha1, 1)) {
2498 struct stat st;
2499 if (lstat(name, &st) < 0) {
2500 if (errno == ENOENT)
2501 goto not_a_valid_file;
2502 die_errno("stat(%s)", name);
2503 }
2504 if (S_ISLNK(st.st_mode)) {
2505 struct strbuf sb = STRBUF_INIT;
2506 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2507 die_errno("readlink(%s)", name);
2508 prep_temp_blob(name, temp, sb.buf, sb.len,
2509 (one->sha1_valid ?
2510 one->sha1 : null_sha1),
2511 (one->sha1_valid ?
2512 one->mode : S_IFLNK));
2513 strbuf_release(&sb);
2514 }
2515 else {
2516 /* we can borrow from the file in the work tree */
2517 temp->name = name;
2518 if (!one->sha1_valid)
2519 strcpy(temp->hex, sha1_to_hex(null_sha1));
2520 else
2521 strcpy(temp->hex, sha1_to_hex(one->sha1));
2522 /* Even though we may sometimes borrow the
2523 * contents from the work tree, we always want
2524 * one->mode. mode is trustworthy even when
2525 * !(one->sha1_valid), as long as
2526 * DIFF_FILE_VALID(one).
2527 */
2528 sprintf(temp->mode, "%06o", one->mode);
2529 }
2530 return temp;
2531 }
2532 else {
2533 if (diff_populate_filespec(one, 0))
2534 die("cannot read data blob for %s", one->path);
2535 prep_temp_blob(name, temp, one->data, one->size,
2536 one->sha1, one->mode);
2537 }
2538 return temp;
2539 }
2540
2541 /* An external diff command takes:
2542 *
2543 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2544 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2545 *
2546 */
2547 static void run_external_diff(const char *pgm,
2548 const char *name,
2549 const char *other,
2550 struct diff_filespec *one,
2551 struct diff_filespec *two,
2552 const char *xfrm_msg,
2553 int complete_rewrite)
2554 {
2555 const char *spawn_arg[10];
2556 int retval;
2557 const char **arg = &spawn_arg[0];
2558
2559 if (one && two) {
2560 struct diff_tempfile *temp_one, *temp_two;
2561 const char *othername = (other ? other : name);
2562 temp_one = prepare_temp_file(name, one);
2563 temp_two = prepare_temp_file(othername, two);
2564 *arg++ = pgm;
2565 *arg++ = name;
2566 *arg++ = temp_one->name;
2567 *arg++ = temp_one->hex;
2568 *arg++ = temp_one->mode;
2569 *arg++ = temp_two->name;
2570 *arg++ = temp_two->hex;
2571 *arg++ = temp_two->mode;
2572 if (other) {
2573 *arg++ = other;
2574 *arg++ = xfrm_msg;
2575 }
2576 } else {
2577 *arg++ = pgm;
2578 *arg++ = name;
2579 }
2580 *arg = NULL;
2581 fflush(NULL);
2582 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2583 remove_tempfile();
2584 if (retval) {
2585 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2586 exit(1);
2587 }
2588 }
2589
2590 static int similarity_index(struct diff_filepair *p)
2591 {
2592 return p->score * 100 / MAX_SCORE;
2593 }
2594
2595 static void fill_metainfo(struct strbuf *msg,
2596 const char *name,
2597 const char *other,
2598 struct diff_filespec *one,
2599 struct diff_filespec *two,
2600 struct diff_options *o,
2601 struct diff_filepair *p,
2602 int *must_show_header,
2603 int use_color)
2604 {
2605 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2606 const char *reset = diff_get_color(use_color, DIFF_RESET);
2607 struct strbuf *msgbuf;
2608 char *line_prefix = "";
2609
2610 *must_show_header = 1;
2611 if (o->output_prefix) {
2612 msgbuf = o->output_prefix(o, o->output_prefix_data);
2613 line_prefix = msgbuf->buf;
2614 }
2615 strbuf_init(msg, PATH_MAX * 2 + 300);
2616 switch (p->status) {
2617 case DIFF_STATUS_COPIED:
2618 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2619 line_prefix, set, similarity_index(p));
2620 strbuf_addf(msg, "%s\n%s%scopy from ",
2621 reset, line_prefix, set);
2622 quote_c_style(name, msg, NULL, 0);
2623 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2624 quote_c_style(other, msg, NULL, 0);
2625 strbuf_addf(msg, "%s\n", reset);
2626 break;
2627 case DIFF_STATUS_RENAMED:
2628 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2629 line_prefix, set, similarity_index(p));
2630 strbuf_addf(msg, "%s\n%s%srename from ",
2631 reset, line_prefix, set);
2632 quote_c_style(name, msg, NULL, 0);
2633 strbuf_addf(msg, "%s\n%s%srename to ",
2634 reset, line_prefix, set);
2635 quote_c_style(other, msg, NULL, 0);
2636 strbuf_addf(msg, "%s\n", reset);
2637 break;
2638 case DIFF_STATUS_MODIFIED:
2639 if (p->score) {
2640 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2641 line_prefix,
2642 set, similarity_index(p), reset);
2643 break;
2644 }
2645 /* fallthru */
2646 default:
2647 *must_show_header = 0;
2648 }
2649 if (one && two && hashcmp(one->sha1, two->sha1)) {
2650 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2651
2652 if (DIFF_OPT_TST(o, BINARY)) {
2653 mmfile_t mf;
2654 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2655 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2656 abbrev = 40;
2657 }
2658 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2659 find_unique_abbrev(one->sha1, abbrev));
2660 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2661 if (one->mode == two->mode)
2662 strbuf_addf(msg, " %06o", one->mode);
2663 strbuf_addf(msg, "%s\n", reset);
2664 }
2665 }
2666
2667 static void run_diff_cmd(const char *pgm,
2668 const char *name,
2669 const char *other,
2670 const char *attr_path,
2671 struct diff_filespec *one,
2672 struct diff_filespec *two,
2673 struct strbuf *msg,
2674 struct diff_options *o,
2675 struct diff_filepair *p)
2676 {
2677 const char *xfrm_msg = NULL;
2678 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2679 int must_show_header = 0;
2680
2681 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2682 pgm = NULL;
2683 else {
2684 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2685 if (drv && drv->external)
2686 pgm = drv->external;
2687 }
2688
2689 if (msg) {
2690 /*
2691 * don't use colors when the header is intended for an
2692 * external diff driver
2693 */
2694 fill_metainfo(msg, name, other, one, two, o, p,
2695 &must_show_header,
2696 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2697 xfrm_msg = msg->len ? msg->buf : NULL;
2698 }
2699
2700 if (pgm) {
2701 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2702 complete_rewrite);
2703 return;
2704 }
2705 if (one && two)
2706 builtin_diff(name, other ? other : name,
2707 one, two, xfrm_msg, must_show_header,
2708 o, complete_rewrite);
2709 else
2710 fprintf(o->file, "* Unmerged path %s\n", name);
2711 }
2712
2713 static void diff_fill_sha1_info(struct diff_filespec *one)
2714 {
2715 if (DIFF_FILE_VALID(one)) {
2716 if (!one->sha1_valid) {
2717 struct stat st;
2718 if (!strcmp(one->path, "-")) {
2719 hashcpy(one->sha1, null_sha1);
2720 return;
2721 }
2722 if (lstat(one->path, &st) < 0)
2723 die_errno("stat '%s'", one->path);
2724 if (index_path(one->sha1, one->path, &st, 0))
2725 die("cannot hash %s", one->path);
2726 }
2727 }
2728 else
2729 hashclr(one->sha1);
2730 }
2731
2732 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2733 {
2734 /* Strip the prefix but do not molest /dev/null and absolute paths */
2735 if (*namep && **namep != '/') {
2736 *namep += prefix_length;
2737 if (**namep == '/')
2738 ++*namep;
2739 }
2740 if (*otherp && **otherp != '/') {
2741 *otherp += prefix_length;
2742 if (**otherp == '/')
2743 ++*otherp;
2744 }
2745 }
2746
2747 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2748 {
2749 const char *pgm = external_diff();
2750 struct strbuf msg;
2751 struct diff_filespec *one = p->one;
2752 struct diff_filespec *two = p->two;
2753 const char *name;
2754 const char *other;
2755 const char *attr_path;
2756
2757 name = p->one->path;
2758 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2759 attr_path = name;
2760 if (o->prefix_length)
2761 strip_prefix(o->prefix_length, &name, &other);
2762
2763 if (DIFF_PAIR_UNMERGED(p)) {
2764 run_diff_cmd(pgm, name, NULL, attr_path,
2765 NULL, NULL, NULL, o, p);
2766 return;
2767 }
2768
2769 diff_fill_sha1_info(one);
2770 diff_fill_sha1_info(two);
2771
2772 if (!pgm &&
2773 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2774 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2775 /*
2776 * a filepair that changes between file and symlink
2777 * needs to be split into deletion and creation.
2778 */
2779 struct diff_filespec *null = alloc_filespec(two->path);
2780 run_diff_cmd(NULL, name, other, attr_path,
2781 one, null, &msg, o, p);
2782 free(null);
2783 strbuf_release(&msg);
2784
2785 null = alloc_filespec(one->path);
2786 run_diff_cmd(NULL, name, other, attr_path,
2787 null, two, &msg, o, p);
2788 free(null);
2789 }
2790 else
2791 run_diff_cmd(pgm, name, other, attr_path,
2792 one, two, &msg, o, p);
2793
2794 strbuf_release(&msg);
2795 }
2796
2797 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2798 struct diffstat_t *diffstat)
2799 {
2800 const char *name;
2801 const char *other;
2802 int complete_rewrite = 0;
2803
2804 if (DIFF_PAIR_UNMERGED(p)) {
2805 /* unmerged */
2806 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2807 return;
2808 }
2809
2810 name = p->one->path;
2811 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2812
2813 if (o->prefix_length)
2814 strip_prefix(o->prefix_length, &name, &other);
2815
2816 diff_fill_sha1_info(p->one);
2817 diff_fill_sha1_info(p->two);
2818
2819 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2820 complete_rewrite = 1;
2821 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2822 }
2823
2824 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2825 {
2826 const char *name;
2827 const char *other;
2828 const char *attr_path;
2829
2830 if (DIFF_PAIR_UNMERGED(p)) {
2831 /* unmerged */
2832 return;
2833 }
2834
2835 name = p->one->path;
2836 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2837 attr_path = other ? other : name;
2838
2839 if (o->prefix_length)
2840 strip_prefix(o->prefix_length, &name, &other);
2841
2842 diff_fill_sha1_info(p->one);
2843 diff_fill_sha1_info(p->two);
2844
2845 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2846 }
2847
2848 void diff_setup(struct diff_options *options)
2849 {
2850 memcpy(options, &default_diff_options, sizeof(*options));
2851
2852 options->file = stdout;
2853
2854 options->line_termination = '\n';
2855 options->break_opt = -1;
2856 options->rename_limit = -1;
2857 options->dirstat_percent = 3;
2858 options->context = 3;
2859
2860 options->change = diff_change;
2861 options->add_remove = diff_addremove;
2862 if (diff_use_color_default > 0)
2863 DIFF_OPT_SET(options, COLOR_DIFF);
2864 options->detect_rename = diff_detect_rename_default;
2865
2866 if (diff_no_prefix) {
2867 options->a_prefix = options->b_prefix = "";
2868 } else if (!diff_mnemonic_prefix) {
2869 options->a_prefix = "a/";
2870 options->b_prefix = "b/";
2871 }
2872 }
2873
2874 int diff_setup_done(struct diff_options *options)
2875 {
2876 int count = 0;
2877
2878 if (options->output_format & DIFF_FORMAT_NAME)
2879 count++;
2880 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2881 count++;
2882 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2883 count++;
2884 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2885 count++;
2886 if (count > 1)
2887 die("--name-only, --name-status, --check and -s are mutually exclusive");
2888
2889 /*
2890 * Most of the time we can say "there are changes"
2891 * only by checking if there are changed paths, but
2892 * --ignore-whitespace* options force us to look
2893 * inside contents.
2894 */
2895
2896 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2897 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2898 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2899 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2900 else
2901 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2902
2903 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2904 options->detect_rename = DIFF_DETECT_COPY;
2905
2906 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2907 options->prefix = NULL;
2908 if (options->prefix)
2909 options->prefix_length = strlen(options->prefix);
2910 else
2911 options->prefix_length = 0;
2912
2913 if (options->output_format & (DIFF_FORMAT_NAME |
2914 DIFF_FORMAT_NAME_STATUS |
2915 DIFF_FORMAT_CHECKDIFF |
2916 DIFF_FORMAT_NO_OUTPUT))
2917 options->output_format &= ~(DIFF_FORMAT_RAW |
2918 DIFF_FORMAT_NUMSTAT |
2919 DIFF_FORMAT_DIFFSTAT |
2920 DIFF_FORMAT_SHORTSTAT |
2921 DIFF_FORMAT_DIRSTAT |
2922 DIFF_FORMAT_SUMMARY |
2923 DIFF_FORMAT_PATCH);
2924
2925 /*
2926 * These cases always need recursive; we do not drop caller-supplied
2927 * recursive bits for other formats here.
2928 */
2929 if (options->output_format & (DIFF_FORMAT_PATCH |
2930 DIFF_FORMAT_NUMSTAT |
2931 DIFF_FORMAT_DIFFSTAT |
2932 DIFF_FORMAT_SHORTSTAT |
2933 DIFF_FORMAT_DIRSTAT |
2934 DIFF_FORMAT_SUMMARY |
2935 DIFF_FORMAT_CHECKDIFF))
2936 DIFF_OPT_SET(options, RECURSIVE);
2937 /*
2938 * Also pickaxe would not work very well if you do not say recursive
2939 */
2940 if (options->pickaxe)
2941 DIFF_OPT_SET(options, RECURSIVE);
2942 /*
2943 * When patches are generated, submodules diffed against the work tree
2944 * must be checked for dirtiness too so it can be shown in the output
2945 */
2946 if (options->output_format & DIFF_FORMAT_PATCH)
2947 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2948
2949 if (options->detect_rename && options->rename_limit < 0)
2950 options->rename_limit = diff_rename_limit_default;
2951 if (options->setup & DIFF_SETUP_USE_CACHE) {
2952 if (!active_cache)
2953 /* read-cache does not die even when it fails
2954 * so it is safe for us to do this here. Also
2955 * it does not smudge active_cache or active_nr
2956 * when it fails, so we do not have to worry about
2957 * cleaning it up ourselves either.
2958 */
2959 read_cache();
2960 }
2961 if (options->abbrev <= 0 || 40 < options->abbrev)
2962 options->abbrev = 40; /* full */
2963
2964 /*
2965 * It does not make sense to show the first hit we happened
2966 * to have found. It does not make sense not to return with
2967 * exit code in such a case either.
2968 */
2969 if (DIFF_OPT_TST(options, QUICK)) {
2970 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2971 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2972 }
2973
2974 return 0;
2975 }
2976
2977 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2978 {
2979 char c, *eq;
2980 int len;
2981
2982 if (*arg != '-')
2983 return 0;
2984 c = *++arg;
2985 if (!c)
2986 return 0;
2987 if (c == arg_short) {
2988 c = *++arg;
2989 if (!c)
2990 return 1;
2991 if (val && isdigit(c)) {
2992 char *end;
2993 int n = strtoul(arg, &end, 10);
2994 if (*end)
2995 return 0;
2996 *val = n;
2997 return 1;
2998 }
2999 return 0;
3000 }
3001 if (c != '-')
3002 return 0;
3003 arg++;
3004 eq = strchr(arg, '=');
3005 if (eq)
3006 len = eq - arg;
3007 else
3008 len = strlen(arg);
3009 if (!len || strncmp(arg, arg_long, len))
3010 return 0;
3011 if (eq) {
3012 int n;
3013 char *end;
3014 if (!isdigit(*++eq))
3015 return 0;
3016 n = strtoul(eq, &end, 10);
3017 if (*end)
3018 return 0;
3019 *val = n;
3020 }
3021 return 1;
3022 }
3023
3024 static int diff_scoreopt_parse(const char *opt);
3025
3026 static inline int short_opt(char opt, const char **argv,
3027 const char **optarg)
3028 {
3029 const char *arg = argv[0];
3030 if (arg[0] != '-' || arg[1] != opt)
3031 return 0;
3032 if (arg[2] != '\0') {
3033 *optarg = arg + 2;
3034 return 1;
3035 }
3036 if (!argv[1])
3037 die("Option '%c' requires a value", opt);
3038 *optarg = argv[1];
3039 return 2;
3040 }
3041
3042 int parse_long_opt(const char *opt, const char **argv,
3043 const char **optarg)
3044 {
3045 const char *arg = argv[0];
3046 if (arg[0] != '-' || arg[1] != '-')
3047 return 0;
3048 arg += strlen("--");
3049 if (prefixcmp(arg, opt))
3050 return 0;
3051 arg += strlen(opt);
3052 if (*arg == '=') { /* sticked form: --option=value */
3053 *optarg = arg + 1;
3054 return 1;
3055 }
3056 if (*arg != '\0')
3057 return 0;
3058 /* separate form: --option value */
3059 if (!argv[1])
3060 die("Option '--%s' requires a value", opt);
3061 *optarg = argv[1];
3062 return 2;
3063 }
3064
3065 static int stat_opt(struct diff_options *options, const char **av)
3066 {
3067 const char *arg = av[0];
3068 char *end;
3069 int width = options->stat_width;
3070 int name_width = options->stat_name_width;
3071 int argcount = 1;
3072
3073 arg += strlen("--stat");
3074 end = (char *)arg;
3075
3076 switch (*arg) {
3077 case '-':
3078 if (!prefixcmp(arg, "-width")) {
3079 arg += strlen("-width");
3080 if (*arg == '=')
3081 width = strtoul(arg + 1, &end, 10);
3082 else if (!*arg && !av[1])
3083 die("Option '--stat-width' requires a value");
3084 else if (!*arg) {
3085 width = strtoul(av[1], &end, 10);
3086 argcount = 2;
3087 }
3088 } else if (!prefixcmp(arg, "-name-width")) {
3089 arg += strlen("-name-width");
3090 if (*arg == '=')
3091 name_width = strtoul(arg + 1, &end, 10);
3092 else if (!*arg && !av[1])
3093 die("Option '--stat-name-width' requires a value");
3094 else if (!*arg) {
3095 name_width = strtoul(av[1], &end, 10);
3096 argcount = 2;
3097 }
3098 }
3099 break;
3100 case '=':
3101 width = strtoul(arg+1, &end, 10);
3102 if (*end == ',')
3103 name_width = strtoul(end+1, &end, 10);
3104 }
3105
3106 /* Important! This checks all the error cases! */
3107 if (*end)
3108 return 0;
3109 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3110 options->stat_name_width = name_width;
3111 options->stat_width = width;
3112 return argcount;
3113 }
3114
3115 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3116 {
3117 const char *arg = av[0];
3118 const char *optarg;
3119 int argcount;
3120
3121 /* Output format options */
3122 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3123 options->output_format |= DIFF_FORMAT_PATCH;
3124 else if (opt_arg(arg, 'U', "unified", &options->context))
3125 options->output_format |= DIFF_FORMAT_PATCH;
3126 else if (!strcmp(arg, "--raw"))
3127 options->output_format |= DIFF_FORMAT_RAW;
3128 else if (!strcmp(arg, "--patch-with-raw"))
3129 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3130 else if (!strcmp(arg, "--numstat"))
3131 options->output_format |= DIFF_FORMAT_NUMSTAT;
3132 else if (!strcmp(arg, "--shortstat"))
3133 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3134 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3135 options->output_format |= DIFF_FORMAT_DIRSTAT;
3136 else if (!strcmp(arg, "--cumulative")) {
3137 options->output_format |= DIFF_FORMAT_DIRSTAT;
3138 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3139 } else if (opt_arg(arg, 0, "dirstat-by-file",
3140 &options->dirstat_percent)) {
3141 options->output_format |= DIFF_FORMAT_DIRSTAT;
3142 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3143 }
3144 else if (!strcmp(arg, "--check"))
3145 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3146 else if (!strcmp(arg, "--summary"))
3147 options->output_format |= DIFF_FORMAT_SUMMARY;
3148 else if (!strcmp(arg, "--patch-with-stat"))
3149 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3150 else if (!strcmp(arg, "--name-only"))
3151 options->output_format |= DIFF_FORMAT_NAME;
3152 else if (!strcmp(arg, "--name-status"))
3153 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3154 else if (!strcmp(arg, "-s"))
3155 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3156 else if (!prefixcmp(arg, "--stat"))
3157 /* --stat, --stat-width, or --stat-name-width */
3158 return stat_opt(options, av);
3159
3160 /* renames options */
3161 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3162 !strcmp(arg, "--break-rewrites")) {
3163 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3164 return error("invalid argument to -B: %s", arg+2);
3165 }
3166 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3167 !strcmp(arg, "--find-renames")) {
3168 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3169 return error("invalid argument to -M: %s", arg+2);
3170 options->detect_rename = DIFF_DETECT_RENAME;
3171 }
3172 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3173 !strcmp(arg, "--find-copies")) {
3174 if (options->detect_rename == DIFF_DETECT_COPY)
3175 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3176 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3177 return error("invalid argument to -C: %s", arg+2);
3178 options->detect_rename = DIFF_DETECT_COPY;
3179 }
3180 else if (!strcmp(arg, "--no-renames"))
3181 options->detect_rename = 0;
3182 else if (!strcmp(arg, "--relative"))
3183 DIFF_OPT_SET(options, RELATIVE_NAME);
3184 else if (!prefixcmp(arg, "--relative=")) {
3185 DIFF_OPT_SET(options, RELATIVE_NAME);
3186 options->prefix = arg + 11;
3187 }
3188
3189 /* xdiff options */
3190 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3191 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3192 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3193 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3194 else if (!strcmp(arg, "--ignore-space-at-eol"))
3195 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3196 else if (!strcmp(arg, "--patience"))
3197 DIFF_XDL_SET(options, PATIENCE_DIFF);
3198
3199 /* flags options */
3200 else if (!strcmp(arg, "--binary")) {
3201 options->output_format |= DIFF_FORMAT_PATCH;
3202 DIFF_OPT_SET(options, BINARY);
3203 }
3204 else if (!strcmp(arg, "--full-index"))
3205 DIFF_OPT_SET(options, FULL_INDEX);
3206 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3207 DIFF_OPT_SET(options, TEXT);
3208 else if (!strcmp(arg, "-R"))
3209 DIFF_OPT_SET(options, REVERSE_DIFF);
3210 else if (!strcmp(arg, "--find-copies-harder"))
3211 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3212 else if (!strcmp(arg, "--follow"))
3213 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3214 else if (!strcmp(arg, "--color"))
3215 DIFF_OPT_SET(options, COLOR_DIFF);
3216 else if (!prefixcmp(arg, "--color=")) {
3217 int value = git_config_colorbool(NULL, arg+8, -1);
3218 if (value == 0)
3219 DIFF_OPT_CLR(options, COLOR_DIFF);
3220 else if (value > 0)
3221 DIFF_OPT_SET(options, COLOR_DIFF);
3222 else
3223 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3224 }
3225 else if (!strcmp(arg, "--no-color"))
3226 DIFF_OPT_CLR(options, COLOR_DIFF);
3227 else if (!strcmp(arg, "--color-words")) {
3228 DIFF_OPT_SET(options, COLOR_DIFF);
3229 options->word_diff = DIFF_WORDS_COLOR;
3230 }
3231 else if (!prefixcmp(arg, "--color-words=")) {
3232 DIFF_OPT_SET(options, COLOR_DIFF);
3233 options->word_diff = DIFF_WORDS_COLOR;
3234 options->word_regex = arg + 14;
3235 }
3236 else if (!strcmp(arg, "--word-diff")) {
3237 if (options->word_diff == DIFF_WORDS_NONE)
3238 options->word_diff = DIFF_WORDS_PLAIN;
3239 }
3240 else if (!prefixcmp(arg, "--word-diff=")) {
3241 const char *type = arg + 12;
3242 if (!strcmp(type, "plain"))
3243 options->word_diff = DIFF_WORDS_PLAIN;
3244 else if (!strcmp(type, "color")) {
3245 DIFF_OPT_SET(options, COLOR_DIFF);
3246 options->word_diff = DIFF_WORDS_COLOR;
3247 }
3248 else if (!strcmp(type, "porcelain"))
3249 options->word_diff = DIFF_WORDS_PORCELAIN;
3250 else if (!strcmp(type, "none"))
3251 options->word_diff = DIFF_WORDS_NONE;
3252 else
3253 die("bad --word-diff argument: %s", type);
3254 }
3255 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3256 if (options->word_diff == DIFF_WORDS_NONE)
3257 options->word_diff = DIFF_WORDS_PLAIN;
3258 options->word_regex = optarg;
3259 return argcount;
3260 }
3261 else if (!strcmp(arg, "--exit-code"))
3262 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3263 else if (!strcmp(arg, "--quiet"))
3264 DIFF_OPT_SET(options, QUICK);
3265 else if (!strcmp(arg, "--ext-diff"))
3266 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3267 else if (!strcmp(arg, "--no-ext-diff"))
3268 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3269 else if (!strcmp(arg, "--textconv"))
3270 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3271 else if (!strcmp(arg, "--no-textconv"))
3272 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3273 else if (!strcmp(arg, "--ignore-submodules")) {
3274 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3275 handle_ignore_submodules_arg(options, "all");
3276 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3277 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3278 handle_ignore_submodules_arg(options, arg + 20);
3279 } else if (!strcmp(arg, "--submodule"))
3280 DIFF_OPT_SET(options, SUBMODULE_LOG);
3281 else if (!prefixcmp(arg, "--submodule=")) {
3282 if (!strcmp(arg + 12, "log"))
3283 DIFF_OPT_SET(options, SUBMODULE_LOG);
3284 }
3285
3286 /* misc options */
3287 else if (!strcmp(arg, "-z"))
3288 options->line_termination = 0;
3289 else if ((argcount = short_opt('l', av, &optarg))) {
3290 options->rename_limit = strtoul(optarg, NULL, 10);
3291 return argcount;
3292 }
3293 else if ((argcount = short_opt('S', av, &optarg))) {
3294 options->pickaxe = optarg;
3295 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3296 return argcount;
3297 } else if ((argcount = short_opt('G', av, &optarg))) {
3298 options->pickaxe = optarg;
3299 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3300 return argcount;
3301 }
3302 else if (!strcmp(arg, "--pickaxe-all"))
3303 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3304 else if (!strcmp(arg, "--pickaxe-regex"))
3305 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3306 else if ((argcount = short_opt('O', av, &optarg))) {
3307 options->orderfile = optarg;
3308 return argcount;
3309 }
3310 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3311 options->filter = optarg;
3312 return argcount;
3313 }
3314 else if (!strcmp(arg, "--abbrev"))
3315 options->abbrev = DEFAULT_ABBREV;
3316 else if (!prefixcmp(arg, "--abbrev=")) {
3317 options->abbrev = strtoul(arg + 9, NULL, 10);
3318 if (options->abbrev < MINIMUM_ABBREV)
3319 options->abbrev = MINIMUM_ABBREV;
3320 else if (40 < options->abbrev)
3321 options->abbrev = 40;
3322 }
3323 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3324 options->a_prefix = optarg;
3325 return argcount;
3326 }
3327 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3328 options->b_prefix = optarg;
3329 return argcount;
3330 }
3331 else if (!strcmp(arg, "--no-prefix"))
3332 options->a_prefix = options->b_prefix = "";
3333 else if (opt_arg(arg, '\0', "inter-hunk-context",
3334 &options->interhunkcontext))
3335 ;
3336 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3337 options->file = fopen(optarg, "w");
3338 if (!options->file)
3339 die_errno("Could not open '%s'", optarg);
3340 options->close_file = 1;
3341 return argcount;
3342 } else
3343 return 0;
3344 return 1;
3345 }
3346
3347 int parse_rename_score(const char **cp_p)
3348 {
3349 unsigned long num, scale;
3350 int ch, dot;
3351 const char *cp = *cp_p;
3352
3353 num = 0;
3354 scale = 1;
3355 dot = 0;
3356 for (;;) {
3357 ch = *cp;
3358 if ( !dot && ch == '.' ) {
3359 scale = 1;
3360 dot = 1;
3361 } else if ( ch == '%' ) {
3362 scale = dot ? scale*100 : 100;
3363 cp++; /* % is always at the end */
3364 break;
3365 } else if ( ch >= '0' && ch <= '9' ) {
3366 if ( scale < 100000 ) {
3367 scale *= 10;
3368 num = (num*10) + (ch-'0');
3369 }
3370 } else {
3371 break;
3372 }
3373 cp++;
3374 }
3375 *cp_p = cp;
3376
3377 /* user says num divided by scale and we say internally that
3378 * is MAX_SCORE * num / scale.
3379 */
3380 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3381 }
3382
3383 static int diff_scoreopt_parse(const char *opt)
3384 {
3385 int opt1, opt2, cmd;
3386
3387 if (*opt++ != '-')
3388 return -1;
3389 cmd = *opt++;
3390 if (cmd == '-') {
3391 /* convert the long-form arguments into short-form versions */
3392 if (!prefixcmp(opt, "break-rewrites")) {
3393 opt += strlen("break-rewrites");
3394 if (*opt == 0 || *opt++ == '=')
3395 cmd = 'B';
3396 } else if (!prefixcmp(opt, "find-copies")) {
3397 opt += strlen("find-copies");
3398 if (*opt == 0 || *opt++ == '=')
3399 cmd = 'C';
3400 } else if (!prefixcmp(opt, "find-renames")) {
3401 opt += strlen("find-renames");
3402 if (*opt == 0 || *opt++ == '=')
3403 cmd = 'M';
3404 }
3405 }
3406 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3407 return -1; /* that is not a -M, -C nor -B option */
3408
3409 opt1 = parse_rename_score(&opt);
3410 if (cmd != 'B')
3411 opt2 = 0;
3412 else {
3413 if (*opt == 0)
3414 opt2 = 0;
3415 else if (*opt != '/')
3416 return -1; /* we expect -B80/99 or -B80 */
3417 else {
3418 opt++;
3419 opt2 = parse_rename_score(&opt);
3420 }
3421 }
3422 if (*opt != 0)
3423 return -1;
3424 return opt1 | (opt2 << 16);
3425 }
3426
3427 struct diff_queue_struct diff_queued_diff;
3428
3429 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3430 {
3431 if (queue->alloc <= queue->nr) {
3432 queue->alloc = alloc_nr(queue->alloc);
3433 queue->queue = xrealloc(queue->queue,
3434 sizeof(dp) * queue->alloc);
3435 }
3436 queue->queue[queue->nr++] = dp;
3437 }
3438
3439 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3440 struct diff_filespec *one,
3441 struct diff_filespec *two)
3442 {
3443 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3444 dp->one = one;
3445 dp->two = two;
3446 if (queue)
3447 diff_q(queue, dp);
3448 return dp;
3449 }
3450
3451 void diff_free_filepair(struct diff_filepair *p)
3452 {
3453 free_filespec(p->one);
3454 free_filespec(p->two);
3455 free(p);
3456 }
3457
3458 /* This is different from find_unique_abbrev() in that
3459 * it stuffs the result with dots for alignment.
3460 */
3461 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3462 {
3463 int abblen;
3464 const char *abbrev;
3465 if (len == 40)
3466 return sha1_to_hex(sha1);
3467
3468 abbrev = find_unique_abbrev(sha1, len);
3469 abblen = strlen(abbrev);
3470 if (abblen < 37) {
3471 static char hex[41];
3472 if (len < abblen && abblen <= len + 2)
3473 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3474 else
3475 sprintf(hex, "%s...", abbrev);
3476 return hex;
3477 }
3478 return sha1_to_hex(sha1);
3479 }
3480
3481 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3482 {
3483 int line_termination = opt->line_termination;
3484 int inter_name_termination = line_termination ? '\t' : '\0';
3485 if (opt->output_prefix) {
3486 struct strbuf *msg = NULL;
3487 msg = opt->output_prefix(opt, opt->output_prefix_data);
3488 fprintf(opt->file, "%s", msg->buf);
3489 }
3490
3491 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3492 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3493 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3494 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3495 }
3496 if (p->score) {
3497 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3498 inter_name_termination);
3499 } else {
3500 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3501 }
3502
3503 if (p->status == DIFF_STATUS_COPIED ||
3504 p->status == DIFF_STATUS_RENAMED) {
3505 const char *name_a, *name_b;
3506 name_a = p->one->path;
3507 name_b = p->two->path;
3508 strip_prefix(opt->prefix_length, &name_a, &name_b);
3509 write_name_quoted(name_a, opt->file, inter_name_termination);
3510 write_name_quoted(name_b, opt->file, line_termination);
3511 } else {
3512 const char *name_a, *name_b;
3513 name_a = p->one->mode ? p->one->path : p->two->path;
3514 name_b = NULL;
3515 strip_prefix(opt->prefix_length, &name_a, &name_b);
3516 write_name_quoted(name_a, opt->file, line_termination);
3517 }
3518 }
3519
3520 int diff_unmodified_pair(struct diff_filepair *p)
3521 {
3522 /* This function is written stricter than necessary to support
3523 * the currently implemented transformers, but the idea is to
3524 * let transformers to produce diff_filepairs any way they want,
3525 * and filter and clean them up here before producing the output.
3526 */
3527 struct diff_filespec *one = p->one, *two = p->two;
3528
3529 if (DIFF_PAIR_UNMERGED(p))
3530 return 0; /* unmerged is interesting */
3531
3532 /* deletion, addition, mode or type change
3533 * and rename are all interesting.
3534 */
3535 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3536 DIFF_PAIR_MODE_CHANGED(p) ||
3537 strcmp(one->path, two->path))
3538 return 0;
3539
3540 /* both are valid and point at the same path. that is, we are
3541 * dealing with a change.
3542 */
3543 if (one->sha1_valid && two->sha1_valid &&
3544 !hashcmp(one->sha1, two->sha1) &&
3545 !one->dirty_submodule && !two->dirty_submodule)
3546 return 1; /* no change */
3547 if (!one->sha1_valid && !two->sha1_valid)
3548 return 1; /* both look at the same file on the filesystem. */
3549 return 0;
3550 }
3551
3552 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3553 {
3554 if (diff_unmodified_pair(p))
3555 return;
3556
3557 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3558 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3559 return; /* no tree diffs in patch format */
3560
3561 run_diff(p, o);
3562 }
3563
3564 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3565 struct diffstat_t *diffstat)
3566 {
3567 if (diff_unmodified_pair(p))
3568 return;
3569
3570 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3571 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3572 return; /* no useful stat for tree diffs */
3573
3574 run_diffstat(p, o, diffstat);
3575 }
3576
3577 static void diff_flush_checkdiff(struct diff_filepair *p,
3578 struct diff_options *o)
3579 {
3580 if (diff_unmodified_pair(p))
3581 return;
3582
3583 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3584 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3585 return; /* nothing to check in tree diffs */
3586
3587 run_checkdiff(p, o);
3588 }
3589
3590 int diff_queue_is_empty(void)
3591 {
3592 struct diff_queue_struct *q = &diff_queued_diff;
3593 int i;
3594 for (i = 0; i < q->nr; i++)
3595 if (!diff_unmodified_pair(q->queue[i]))
3596 return 0;
3597 return 1;
3598 }
3599
3600 #if DIFF_DEBUG
3601 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3602 {
3603 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3604 x, one ? one : "",
3605 s->path,
3606 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3607 s->mode,
3608 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3609 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3610 x, one ? one : "",
3611 s->size, s->xfrm_flags);
3612 }
3613
3614 void diff_debug_filepair(const struct diff_filepair *p, int i)
3615 {
3616 diff_debug_filespec(p->one, i, "one");
3617 diff_debug_filespec(p->two, i, "two");
3618 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3619 p->score, p->status ? p->status : '?',
3620 p->one->rename_used, p->broken_pair);
3621 }
3622
3623 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3624 {
3625 int i;
3626 if (msg)
3627 fprintf(stderr, "%s\n", msg);
3628 fprintf(stderr, "q->nr = %d\n", q->nr);
3629 for (i = 0; i < q->nr; i++) {
3630 struct diff_filepair *p = q->queue[i];
3631 diff_debug_filepair(p, i);
3632 }
3633 }
3634 #endif
3635
3636 static void diff_resolve_rename_copy(void)
3637 {
3638 int i;
3639 struct diff_filepair *p;
3640 struct diff_queue_struct *q = &diff_queued_diff;
3641
3642 diff_debug_queue("resolve-rename-copy", q);
3643
3644 for (i = 0; i < q->nr; i++) {
3645 p = q->queue[i];
3646 p->status = 0; /* undecided */
3647 if (DIFF_PAIR_UNMERGED(p))
3648 p->status = DIFF_STATUS_UNMERGED;
3649 else if (!DIFF_FILE_VALID(p->one))
3650 p->status = DIFF_STATUS_ADDED;
3651 else if (!DIFF_FILE_VALID(p->two))
3652 p->status = DIFF_STATUS_DELETED;
3653 else if (DIFF_PAIR_TYPE_CHANGED(p))
3654 p->status = DIFF_STATUS_TYPE_CHANGED;
3655
3656 /* from this point on, we are dealing with a pair
3657 * whose both sides are valid and of the same type, i.e.
3658 * either in-place edit or rename/copy edit.
3659 */
3660 else if (DIFF_PAIR_RENAME(p)) {
3661 /*
3662 * A rename might have re-connected a broken
3663 * pair up, causing the pathnames to be the
3664 * same again. If so, that's not a rename at
3665 * all, just a modification..
3666 *
3667 * Otherwise, see if this source was used for
3668 * multiple renames, in which case we decrement
3669 * the count, and call it a copy.
3670 */
3671 if (!strcmp(p->one->path, p->two->path))
3672 p->status = DIFF_STATUS_MODIFIED;
3673 else if (--p->one->rename_used > 0)
3674 p->status = DIFF_STATUS_COPIED;
3675 else
3676 p->status = DIFF_STATUS_RENAMED;
3677 }
3678 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3679 p->one->mode != p->two->mode ||
3680 p->one->dirty_submodule ||
3681 p->two->dirty_submodule ||
3682 is_null_sha1(p->one->sha1))
3683 p->status = DIFF_STATUS_MODIFIED;
3684 else {
3685 /* This is a "no-change" entry and should not
3686 * happen anymore, but prepare for broken callers.
3687 */
3688 error("feeding unmodified %s to diffcore",
3689 p->one->path);
3690 p->status = DIFF_STATUS_UNKNOWN;
3691 }
3692 }
3693 diff_debug_queue("resolve-rename-copy done", q);
3694 }
3695
3696 static int check_pair_status(struct diff_filepair *p)
3697 {
3698 switch (p->status) {
3699 case DIFF_STATUS_UNKNOWN:
3700 return 0;
3701 case 0:
3702 die("internal error in diff-resolve-rename-copy");
3703 default:
3704 return 1;
3705 }
3706 }
3707
3708 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3709 {
3710 int fmt = opt->output_format;
3711
3712 if (fmt & DIFF_FORMAT_CHECKDIFF)
3713 diff_flush_checkdiff(p, opt);
3714 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3715 diff_flush_raw(p, opt);
3716 else if (fmt & DIFF_FORMAT_NAME) {
3717 const char *name_a, *name_b;
3718 name_a = p->two->path;
3719 name_b = NULL;
3720 strip_prefix(opt->prefix_length, &name_a, &name_b);
3721 write_name_quoted(name_a, opt->file, opt->line_termination);
3722 }
3723 }
3724
3725 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3726 {
3727 if (fs->mode)
3728 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3729 else
3730 fprintf(file, " %s ", newdelete);
3731 write_name_quoted(fs->path, file, '\n');
3732 }
3733
3734
3735 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3736 const char *line_prefix)
3737 {
3738 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3739 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3740 p->two->mode, show_name ? ' ' : '\n');
3741 if (show_name) {
3742 write_name_quoted(p->two->path, file, '\n');
3743 }
3744 }
3745 }
3746
3747 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3748 const char *line_prefix)
3749 {
3750 char *names = pprint_rename(p->one->path, p->two->path);
3751
3752 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3753 free(names);
3754 show_mode_change(file, p, 0, line_prefix);
3755 }
3756
3757 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3758 {
3759 FILE *file = opt->file;
3760 char *line_prefix = "";
3761
3762 if (opt->output_prefix) {
3763 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3764 line_prefix = buf->buf;
3765 }
3766
3767 switch(p->status) {
3768 case DIFF_STATUS_DELETED:
3769 fputs(line_prefix, file);
3770 show_file_mode_name(file, "delete", p->one);
3771 break;
3772 case DIFF_STATUS_ADDED:
3773 fputs(line_prefix, file);
3774 show_file_mode_name(file, "create", p->two);
3775 break;
3776 case DIFF_STATUS_COPIED:
3777 fputs(line_prefix, file);
3778 show_rename_copy(file, "copy", p, line_prefix);
3779 break;
3780 case DIFF_STATUS_RENAMED:
3781 fputs(line_prefix, file);
3782 show_rename_copy(file, "rename", p, line_prefix);
3783 break;
3784 default:
3785 if (p->score) {
3786 fprintf(file, "%s rewrite ", line_prefix);
3787 write_name_quoted(p->two->path, file, ' ');
3788 fprintf(file, "(%d%%)\n", similarity_index(p));
3789 }
3790 show_mode_change(file, p, !p->score, line_prefix);
3791 break;
3792 }
3793 }
3794
3795 struct patch_id_t {
3796 git_SHA_CTX *ctx;
3797 int patchlen;
3798 };
3799
3800 static int remove_space(char *line, int len)
3801 {
3802 int i;
3803 char *dst = line;
3804 unsigned char c;
3805
3806 for (i = 0; i < len; i++)
3807 if (!isspace((c = line[i])))
3808 *dst++ = c;
3809
3810 return dst - line;
3811 }
3812
3813 static void patch_id_consume(void *priv, char *line, unsigned long len)
3814 {
3815 struct patch_id_t *data = priv;
3816 int new_len;
3817
3818 /* Ignore line numbers when computing the SHA1 of the patch */
3819 if (!prefixcmp(line, "@@ -"))
3820 return;
3821
3822 new_len = remove_space(line, len);
3823
3824 git_SHA1_Update(data->ctx, line, new_len);
3825 data->patchlen += new_len;
3826 }
3827
3828 /* returns 0 upon success, and writes result into sha1 */
3829 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3830 {
3831 struct diff_queue_struct *q = &diff_queued_diff;
3832 int i;
3833 git_SHA_CTX ctx;
3834 struct patch_id_t data;
3835 char buffer[PATH_MAX * 4 + 20];
3836
3837 git_SHA1_Init(&ctx);
3838 memset(&data, 0, sizeof(struct patch_id_t));
3839 data.ctx = &ctx;
3840
3841 for (i = 0; i < q->nr; i++) {
3842 xpparam_t xpp;
3843 xdemitconf_t xecfg;
3844 mmfile_t mf1, mf2;
3845 struct diff_filepair *p = q->queue[i];
3846 int len1, len2;
3847
3848 memset(&xpp, 0, sizeof(xpp));
3849 memset(&xecfg, 0, sizeof(xecfg));
3850 if (p->status == 0)
3851 return error("internal diff status error");
3852 if (p->status == DIFF_STATUS_UNKNOWN)
3853 continue;
3854 if (diff_unmodified_pair(p))
3855 continue;
3856 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3857 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3858 continue;
3859 if (DIFF_PAIR_UNMERGED(p))
3860 continue;
3861
3862 diff_fill_sha1_info(p->one);
3863 diff_fill_sha1_info(p->two);
3864 if (fill_mmfile(&mf1, p->one) < 0 ||
3865 fill_mmfile(&mf2, p->two) < 0)
3866 return error("unable to read files to diff");
3867
3868 len1 = remove_space(p->one->path, strlen(p->one->path));
3869 len2 = remove_space(p->two->path, strlen(p->two->path));
3870 if (p->one->mode == 0)
3871 len1 = snprintf(buffer, sizeof(buffer),
3872 "diff--gita/%.*sb/%.*s"
3873 "newfilemode%06o"
3874 "---/dev/null"
3875 "+++b/%.*s",
3876 len1, p->one->path,
3877 len2, p->two->path,
3878 p->two->mode,
3879 len2, p->two->path);
3880 else if (p->two->mode == 0)
3881 len1 = snprintf(buffer, sizeof(buffer),
3882 "diff--gita/%.*sb/%.*s"
3883 "deletedfilemode%06o"
3884 "---a/%.*s"
3885 "+++/dev/null",
3886 len1, p->one->path,
3887 len2, p->two->path,
3888 p->one->mode,
3889 len1, p->one->path);
3890 else
3891 len1 = snprintf(buffer, sizeof(buffer),
3892 "diff--gita/%.*sb/%.*s"
3893 "---a/%.*s"
3894 "+++b/%.*s",
3895 len1, p->one->path,
3896 len2, p->two->path,
3897 len1, p->one->path,
3898 len2, p->two->path);
3899 git_SHA1_Update(&ctx, buffer, len1);
3900
3901 if (diff_filespec_is_binary(p->one) ||
3902 diff_filespec_is_binary(p->two)) {
3903 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
3904 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
3905 continue;
3906 }
3907
3908 xpp.flags = 0;
3909 xecfg.ctxlen = 3;
3910 xecfg.flags = 0;
3911 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3912 &xpp, &xecfg);
3913 }
3914
3915 git_SHA1_Final(sha1, &ctx);
3916 return 0;
3917 }
3918
3919 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3920 {
3921 struct diff_queue_struct *q = &diff_queued_diff;
3922 int i;
3923 int result = diff_get_patch_id(options, sha1);
3924
3925 for (i = 0; i < q->nr; i++)
3926 diff_free_filepair(q->queue[i]);
3927
3928 free(q->queue);
3929 DIFF_QUEUE_CLEAR(q);
3930
3931 return result;
3932 }
3933
3934 static int is_summary_empty(const struct diff_queue_struct *q)
3935 {
3936 int i;
3937
3938 for (i = 0; i < q->nr; i++) {
3939 const struct diff_filepair *p = q->queue[i];
3940
3941 switch (p->status) {
3942 case DIFF_STATUS_DELETED:
3943 case DIFF_STATUS_ADDED:
3944 case DIFF_STATUS_COPIED:
3945 case DIFF_STATUS_RENAMED:
3946 return 0;
3947 default:
3948 if (p->score)
3949 return 0;
3950 if (p->one->mode && p->two->mode &&
3951 p->one->mode != p->two->mode)
3952 return 0;
3953 break;
3954 }
3955 }
3956 return 1;
3957 }
3958
3959 void diff_flush(struct diff_options *options)
3960 {
3961 struct diff_queue_struct *q = &diff_queued_diff;
3962 int i, output_format = options->output_format;
3963 int separator = 0;
3964
3965 /*
3966 * Order: raw, stat, summary, patch
3967 * or: name/name-status/checkdiff (other bits clear)
3968 */
3969 if (!q->nr)
3970 goto free_queue;
3971
3972 if (output_format & (DIFF_FORMAT_RAW |
3973 DIFF_FORMAT_NAME |
3974 DIFF_FORMAT_NAME_STATUS |
3975 DIFF_FORMAT_CHECKDIFF)) {
3976 for (i = 0; i < q->nr; i++) {
3977 struct diff_filepair *p = q->queue[i];
3978 if (check_pair_status(p))
3979 flush_one_pair(p, options);
3980 }
3981 separator++;
3982 }
3983
3984 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3985 struct diffstat_t diffstat;
3986
3987 memset(&diffstat, 0, sizeof(struct diffstat_t));
3988 for (i = 0; i < q->nr; i++) {
3989 struct diff_filepair *p = q->queue[i];
3990 if (check_pair_status(p))
3991 diff_flush_stat(p, options, &diffstat);
3992 }
3993 if (output_format & DIFF_FORMAT_NUMSTAT)
3994 show_numstat(&diffstat, options);
3995 if (output_format & DIFF_FORMAT_DIFFSTAT)
3996 show_stats(&diffstat, options);
3997 if (output_format & DIFF_FORMAT_SHORTSTAT)
3998 show_shortstats(&diffstat, options);
3999 free_diffstat_info(&diffstat);
4000 separator++;
4001 }
4002 if (output_format & DIFF_FORMAT_DIRSTAT)
4003 show_dirstat(options);
4004
4005 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4006 for (i = 0; i < q->nr; i++) {
4007 diff_summary(options, q->queue[i]);
4008 }
4009 separator++;
4010 }
4011
4012 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4013 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4014 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4015 /*
4016 * run diff_flush_patch for the exit status. setting
4017 * options->file to /dev/null should be safe, becaue we
4018 * aren't supposed to produce any output anyway.
4019 */
4020 if (options->close_file)
4021 fclose(options->file);
4022 options->file = fopen("/dev/null", "w");
4023 if (!options->file)
4024 die_errno("Could not open /dev/null");
4025 options->close_file = 1;
4026 for (i = 0; i < q->nr; i++) {
4027 struct diff_filepair *p = q->queue[i];
4028 if (check_pair_status(p))
4029 diff_flush_patch(p, options);
4030 if (options->found_changes)
4031 break;
4032 }
4033 }
4034
4035 if (output_format & DIFF_FORMAT_PATCH) {
4036 if (separator) {
4037 putc(options->line_termination, options->file);
4038 if (options->stat_sep) {
4039 /* attach patch instead of inline */
4040 fputs(options->stat_sep, options->file);
4041 }
4042 }
4043
4044 for (i = 0; i < q->nr; i++) {
4045 struct diff_filepair *p = q->queue[i];
4046 if (check_pair_status(p))
4047 diff_flush_patch(p, options);
4048 }
4049 }
4050
4051 if (output_format & DIFF_FORMAT_CALLBACK)
4052 options->format_callback(q, options, options->format_callback_data);
4053
4054 for (i = 0; i < q->nr; i++)
4055 diff_free_filepair(q->queue[i]);
4056 free_queue:
4057 free(q->queue);
4058 DIFF_QUEUE_CLEAR(q);
4059 if (options->close_file)
4060 fclose(options->file);
4061
4062 /*
4063 * Report the content-level differences with HAS_CHANGES;
4064 * diff_addremove/diff_change does not set the bit when
4065 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4066 */
4067 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4068 if (options->found_changes)
4069 DIFF_OPT_SET(options, HAS_CHANGES);
4070 else
4071 DIFF_OPT_CLR(options, HAS_CHANGES);
4072 }
4073 }
4074
4075 static void diffcore_apply_filter(const char *filter)
4076 {
4077 int i;
4078 struct diff_queue_struct *q = &diff_queued_diff;
4079 struct diff_queue_struct outq;
4080 DIFF_QUEUE_CLEAR(&outq);
4081
4082 if (!filter)
4083 return;
4084
4085 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4086 int found;
4087 for (i = found = 0; !found && i < q->nr; i++) {
4088 struct diff_filepair *p = q->queue[i];
4089 if (((p->status == DIFF_STATUS_MODIFIED) &&
4090 ((p->score &&
4091 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4092 (!p->score &&
4093 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4094 ((p->status != DIFF_STATUS_MODIFIED) &&
4095 strchr(filter, p->status)))
4096 found++;
4097 }
4098 if (found)
4099 return;
4100
4101 /* otherwise we will clear the whole queue
4102 * by copying the empty outq at the end of this
4103 * function, but first clear the current entries
4104 * in the queue.
4105 */
4106 for (i = 0; i < q->nr; i++)
4107 diff_free_filepair(q->queue[i]);
4108 }
4109 else {
4110 /* Only the matching ones */
4111 for (i = 0; i < q->nr; i++) {
4112 struct diff_filepair *p = q->queue[i];
4113
4114 if (((p->status == DIFF_STATUS_MODIFIED) &&
4115 ((p->score &&
4116 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4117 (!p->score &&
4118 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4119 ((p->status != DIFF_STATUS_MODIFIED) &&
4120 strchr(filter, p->status)))
4121 diff_q(&outq, p);
4122 else
4123 diff_free_filepair(p);
4124 }
4125 }
4126 free(q->queue);
4127 *q = outq;
4128 }
4129
4130 /* Check whether two filespecs with the same mode and size are identical */
4131 static int diff_filespec_is_identical(struct diff_filespec *one,
4132 struct diff_filespec *two)
4133 {
4134 if (S_ISGITLINK(one->mode))
4135 return 0;
4136 if (diff_populate_filespec(one, 0))
4137 return 0;
4138 if (diff_populate_filespec(two, 0))
4139 return 0;
4140 return !memcmp(one->data, two->data, one->size);
4141 }
4142
4143 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4144 {
4145 int i;
4146 struct diff_queue_struct *q = &diff_queued_diff;
4147 struct diff_queue_struct outq;
4148 DIFF_QUEUE_CLEAR(&outq);
4149
4150 for (i = 0; i < q->nr; i++) {
4151 struct diff_filepair *p = q->queue[i];
4152
4153 /*
4154 * 1. Entries that come from stat info dirtiness
4155 * always have both sides (iow, not create/delete),
4156 * one side of the object name is unknown, with
4157 * the same mode and size. Keep the ones that
4158 * do not match these criteria. They have real
4159 * differences.
4160 *
4161 * 2. At this point, the file is known to be modified,
4162 * with the same mode and size, and the object
4163 * name of one side is unknown. Need to inspect
4164 * the identical contents.
4165 */
4166 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4167 !DIFF_FILE_VALID(p->two) ||
4168 (p->one->sha1_valid && p->two->sha1_valid) ||
4169 (p->one->mode != p->two->mode) ||
4170 diff_populate_filespec(p->one, 1) ||
4171 diff_populate_filespec(p->two, 1) ||
4172 (p->one->size != p->two->size) ||
4173 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4174 diff_q(&outq, p);
4175 else {
4176 /*
4177 * The caller can subtract 1 from skip_stat_unmatch
4178 * to determine how many paths were dirty only
4179 * due to stat info mismatch.
4180 */
4181 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4182 diffopt->skip_stat_unmatch++;
4183 diff_free_filepair(p);
4184 }
4185 }
4186 free(q->queue);
4187 *q = outq;
4188 }
4189
4190 static int diffnamecmp(const void *a_, const void *b_)
4191 {
4192 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4193 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4194 const char *name_a, *name_b;
4195
4196 name_a = a->one ? a->one->path : a->two->path;
4197 name_b = b->one ? b->one->path : b->two->path;
4198 return strcmp(name_a, name_b);
4199 }
4200
4201 void diffcore_fix_diff_index(struct diff_options *options)
4202 {
4203 struct diff_queue_struct *q = &diff_queued_diff;
4204 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4205 }
4206
4207 void diffcore_std(struct diff_options *options)
4208 {
4209 if (options->skip_stat_unmatch)
4210 diffcore_skip_stat_unmatch(options);
4211 if (!options->found_follow) {
4212 /* See try_to_follow_renames() in tree-diff.c */
4213 if (options->break_opt != -1)
4214 diffcore_break(options->break_opt);
4215 if (options->detect_rename)
4216 diffcore_rename(options);
4217 if (options->break_opt != -1)
4218 diffcore_merge_broken();
4219 }
4220 if (options->pickaxe)
4221 diffcore_pickaxe(options);
4222 if (options->orderfile)
4223 diffcore_order(options->orderfile);
4224 if (!options->found_follow)
4225 /* See try_to_follow_renames() in tree-diff.c */
4226 diff_resolve_rename_copy();
4227 diffcore_apply_filter(options->filter);
4228
4229 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4230 DIFF_OPT_SET(options, HAS_CHANGES);
4231 else
4232 DIFF_OPT_CLR(options, HAS_CHANGES);
4233
4234 options->found_follow = 0;
4235 }
4236
4237 int diff_result_code(struct diff_options *opt, int status)
4238 {
4239 int result = 0;
4240 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4241 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4242 return status;
4243 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4244 DIFF_OPT_TST(opt, HAS_CHANGES))
4245 result |= 01;
4246 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4247 DIFF_OPT_TST(opt, CHECK_FAILED))
4248 result |= 02;
4249 return result;
4250 }
4251
4252 /*
4253 * Shall changes to this submodule be ignored?
4254 *
4255 * Submodule changes can be configured to be ignored separately for each path,
4256 * but that configuration can be overridden from the command line.
4257 */
4258 static int is_submodule_ignored(const char *path, struct diff_options *options)
4259 {
4260 int ignored = 0;
4261 unsigned orig_flags = options->flags;
4262 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4263 set_diffopt_flags_from_submodule_config(options, path);
4264 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4265 ignored = 1;
4266 options->flags = orig_flags;
4267 return ignored;
4268 }
4269
4270 void diff_addremove(struct diff_options *options,
4271 int addremove, unsigned mode,
4272 const unsigned char *sha1,
4273 const char *concatpath, unsigned dirty_submodule)
4274 {
4275 struct diff_filespec *one, *two;
4276
4277 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4278 return;
4279
4280 /* This may look odd, but it is a preparation for
4281 * feeding "there are unchanged files which should
4282 * not produce diffs, but when you are doing copy
4283 * detection you would need them, so here they are"
4284 * entries to the diff-core. They will be prefixed
4285 * with something like '=' or '*' (I haven't decided
4286 * which but should not make any difference).
4287 * Feeding the same new and old to diff_change()
4288 * also has the same effect.
4289 * Before the final output happens, they are pruned after
4290 * merged into rename/copy pairs as appropriate.
4291 */
4292 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4293 addremove = (addremove == '+' ? '-' :
4294 addremove == '-' ? '+' : addremove);
4295
4296 if (options->prefix &&
4297 strncmp(concatpath, options->prefix, options->prefix_length))
4298 return;
4299
4300 one = alloc_filespec(concatpath);
4301 two = alloc_filespec(concatpath);
4302
4303 if (addremove != '+')
4304 fill_filespec(one, sha1, mode);
4305 if (addremove != '-') {
4306 fill_filespec(two, sha1, mode);
4307 two->dirty_submodule = dirty_submodule;
4308 }
4309
4310 diff_queue(&diff_queued_diff, one, two);
4311 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4312 DIFF_OPT_SET(options, HAS_CHANGES);
4313 }
4314
4315 void diff_change(struct diff_options *options,
4316 unsigned old_mode, unsigned new_mode,
4317 const unsigned char *old_sha1,
4318 const unsigned char *new_sha1,
4319 const char *concatpath,
4320 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4321 {
4322 struct diff_filespec *one, *two;
4323
4324 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4325 is_submodule_ignored(concatpath, options))
4326 return;
4327
4328 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4329 unsigned tmp;
4330 const unsigned char *tmp_c;
4331 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4332 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4333 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4334 new_dirty_submodule = tmp;
4335 }
4336
4337 if (options->prefix &&
4338 strncmp(concatpath, options->prefix, options->prefix_length))
4339 return;
4340
4341 one = alloc_filespec(concatpath);
4342 two = alloc_filespec(concatpath);
4343 fill_filespec(one, old_sha1, old_mode);
4344 fill_filespec(two, new_sha1, new_mode);
4345 one->dirty_submodule = old_dirty_submodule;
4346 two->dirty_submodule = new_dirty_submodule;
4347
4348 diff_queue(&diff_queued_diff, one, two);
4349 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4350 DIFF_OPT_SET(options, HAS_CHANGES);
4351 }
4352
4353 void diff_unmerge(struct diff_options *options,
4354 const char *path,
4355 unsigned mode, const unsigned char *sha1)
4356 {
4357 struct diff_filespec *one, *two;
4358
4359 if (options->prefix &&
4360 strncmp(path, options->prefix, options->prefix_length))
4361 return;
4362
4363 one = alloc_filespec(path);
4364 two = alloc_filespec(path);
4365 fill_filespec(one, sha1, mode);
4366 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
4367 }
4368
4369 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4370 size_t *outsize)
4371 {
4372 struct diff_tempfile *temp;
4373 const char *argv[3];
4374 const char **arg = argv;
4375 struct child_process child;
4376 struct strbuf buf = STRBUF_INIT;
4377 int err = 0;
4378
4379 temp = prepare_temp_file(spec->path, spec);
4380 *arg++ = pgm;
4381 *arg++ = temp->name;
4382 *arg = NULL;
4383
4384 memset(&child, 0, sizeof(child));
4385 child.use_shell = 1;
4386 child.argv = argv;
4387 child.out = -1;
4388 if (start_command(&child)) {
4389 remove_tempfile();
4390 return NULL;
4391 }
4392
4393 if (strbuf_read(&buf, child.out, 0) < 0)
4394 err = error("error reading from textconv command '%s'", pgm);
4395 close(child.out);
4396
4397 if (finish_command(&child) || err) {
4398 strbuf_release(&buf);
4399 remove_tempfile();
4400 return NULL;
4401 }
4402 remove_tempfile();
4403
4404 return strbuf_detach(&buf, outsize);
4405 }
4406
4407 size_t fill_textconv(struct userdiff_driver *driver,
4408 struct diff_filespec *df,
4409 char **outbuf)
4410 {
4411 size_t size;
4412
4413 if (!driver || !driver->textconv) {
4414 if (!DIFF_FILE_VALID(df)) {
4415 *outbuf = "";
4416 return 0;
4417 }
4418 if (diff_populate_filespec(df, 0))
4419 die("unable to read files to diff");
4420 *outbuf = df->data;
4421 return df->size;
4422 }
4423
4424 if (driver->textconv_cache && df->sha1_valid) {
4425 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4426 &size);
4427 if (*outbuf)
4428 return size;
4429 }
4430
4431 *outbuf = run_textconv(driver->textconv, df, &size);
4432 if (!*outbuf)
4433 die("unable to read files to diff");
4434
4435 if (driver->textconv_cache && df->sha1_valid) {
4436 /* ignore errors, as we might be in a readonly repository */
4437 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4438 size);
4439 /*
4440 * we could save up changes and flush them all at the end,
4441 * but we would need an extra call after all diffing is done.
4442 * Since generating a cache entry is the slow path anyway,
4443 * this extra overhead probably isn't a big deal.
4444 */
4445 notes_cache_write(driver->textconv_cache);
4446 }
4447
4448 return size;
4449 }
Michael J Gruber's git tree