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Merge branch 'aw/maint-rebase-i-p-no-ff'
[git/mingw/4msysgit/gitPS1fix.git] / diff.c
blob3b40e597d5793d13944f9604e5197ac216eb3a3e
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 400;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static 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 if (!o->irreversible_delete)
585 print_line_count(o->file, lc_a);
586 else
587 fprintf(o->file, "?,?");
588 fprintf(o->file, " +");
589 print_line_count(o->file, lc_b);
590 fprintf(o->file, " @@%s\n", reset);
591 if (lc_a && !o->irreversible_delete)
592 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
593 if (lc_b)
594 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
595 if (textconv_one)
596 free((char *)data_one);
597 if (textconv_two)
598 free((char *)data_two);
599 }
600
601 struct diff_words_buffer {
602 mmfile_t text;
603 long alloc;
604 struct diff_words_orig {
605 const char *begin, *end;
606 } *orig;
607 int orig_nr, orig_alloc;
608 };
609
610 static void diff_words_append(char *line, unsigned long len,
611 struct diff_words_buffer *buffer)
612 {
613 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
614 line++;
615 len--;
616 memcpy(buffer->text.ptr + buffer->text.size, line, len);
617 buffer->text.size += len;
618 buffer->text.ptr[buffer->text.size] = '\0';
619 }
620
621 struct diff_words_style_elem {
622 const char *prefix;
623 const char *suffix;
624 const char *color; /* NULL; filled in by the setup code if
625 * color is enabled */
626 };
627
628 struct diff_words_style {
629 enum diff_words_type type;
630 struct diff_words_style_elem new, old, ctx;
631 const char *newline;
632 };
633
634 static struct diff_words_style diff_words_styles[] = {
635 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
636 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
637 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
638 };
639
640 struct diff_words_data {
641 struct diff_words_buffer minus, plus;
642 const char *current_plus;
643 int last_minus;
644 struct diff_options *opt;
645 regex_t *word_regex;
646 enum diff_words_type type;
647 struct diff_words_style *style;
648 };
649
650 static int fn_out_diff_words_write_helper(FILE *fp,
651 struct diff_words_style_elem *st_el,
652 const char *newline,
653 size_t count, const char *buf,
654 const char *line_prefix)
655 {
656 int print = 0;
657
658 while (count) {
659 char *p = memchr(buf, '\n', count);
660 if (print)
661 fputs(line_prefix, fp);
662 if (p != buf) {
663 if (st_el->color && fputs(st_el->color, fp) < 0)
664 return -1;
665 if (fputs(st_el->prefix, fp) < 0 ||
666 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
667 fputs(st_el->suffix, fp) < 0)
668 return -1;
669 if (st_el->color && *st_el->color
670 && fputs(GIT_COLOR_RESET, fp) < 0)
671 return -1;
672 }
673 if (!p)
674 return 0;
675 if (fputs(newline, fp) < 0)
676 return -1;
677 count -= p + 1 - buf;
678 buf = p + 1;
679 print = 1;
680 }
681 return 0;
682 }
683
684 /*
685 * '--color-words' algorithm can be described as:
686 *
687 * 1. collect a the minus/plus lines of a diff hunk, divided into
688 * minus-lines and plus-lines;
689 *
690 * 2. break both minus-lines and plus-lines into words and
691 * place them into two mmfile_t with one word for each line;
692 *
693 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
694 *
695 * And for the common parts of the both file, we output the plus side text.
696 * diff_words->current_plus is used to trace the current position of the plus file
697 * which printed. diff_words->last_minus is used to trace the last minus word
698 * printed.
699 *
700 * For '--graph' to work with '--color-words', we need to output the graph prefix
701 * on each line of color words output. Generally, there are two conditions on
702 * which we should output the prefix.
703 *
704 * 1. diff_words->last_minus == 0 &&
705 * diff_words->current_plus == diff_words->plus.text.ptr
706 *
707 * that is: the plus text must start as a new line, and if there is no minus
708 * word printed, a graph prefix must be printed.
709 *
710 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
711 * *(diff_words->current_plus - 1) == '\n'
712 *
713 * that is: a graph prefix must be printed following a '\n'
714 */
715 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
716 {
717 if ((diff_words->last_minus == 0 &&
718 diff_words->current_plus == diff_words->plus.text.ptr) ||
719 (diff_words->current_plus > diff_words->plus.text.ptr &&
720 *(diff_words->current_plus - 1) == '\n')) {
721 return 1;
722 } else {
723 return 0;
724 }
725 }
726
727 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
728 {
729 struct diff_words_data *diff_words = priv;
730 struct diff_words_style *style = diff_words->style;
731 int minus_first, minus_len, plus_first, plus_len;
732 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
733 struct diff_options *opt = diff_words->opt;
734 struct strbuf *msgbuf;
735 char *line_prefix = "";
736
737 if (line[0] != '@' || parse_hunk_header(line, len,
738 &minus_first, &minus_len, &plus_first, &plus_len))
739 return;
740
741 assert(opt);
742 if (opt->output_prefix) {
743 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
744 line_prefix = msgbuf->buf;
745 }
746
747 /* POSIX requires that first be decremented by one if len == 0... */
748 if (minus_len) {
749 minus_begin = diff_words->minus.orig[minus_first].begin;
750 minus_end =
751 diff_words->minus.orig[minus_first + minus_len - 1].end;
752 } else
753 minus_begin = minus_end =
754 diff_words->minus.orig[minus_first].end;
755
756 if (plus_len) {
757 plus_begin = diff_words->plus.orig[plus_first].begin;
758 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
759 } else
760 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
761
762 if (color_words_output_graph_prefix(diff_words)) {
763 fputs(line_prefix, diff_words->opt->file);
764 }
765 if (diff_words->current_plus != plus_begin) {
766 fn_out_diff_words_write_helper(diff_words->opt->file,
767 &style->ctx, style->newline,
768 plus_begin - diff_words->current_plus,
769 diff_words->current_plus, line_prefix);
770 if (*(plus_begin - 1) == '\n')
771 fputs(line_prefix, diff_words->opt->file);
772 }
773 if (minus_begin != minus_end) {
774 fn_out_diff_words_write_helper(diff_words->opt->file,
775 &style->old, style->newline,
776 minus_end - minus_begin, minus_begin,
777 line_prefix);
778 }
779 if (plus_begin != plus_end) {
780 fn_out_diff_words_write_helper(diff_words->opt->file,
781 &style->new, style->newline,
782 plus_end - plus_begin, plus_begin,
783 line_prefix);
784 }
785
786 diff_words->current_plus = plus_end;
787 diff_words->last_minus = minus_first;
788 }
789
790 /* This function starts looking at *begin, and returns 0 iff a word was found. */
791 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
792 int *begin, int *end)
793 {
794 if (word_regex && *begin < buffer->size) {
795 regmatch_t match[1];
796 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
797 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
798 '\n', match[0].rm_eo - match[0].rm_so);
799 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
800 *begin += match[0].rm_so;
801 return *begin >= *end;
802 }
803 return -1;
804 }
805
806 /* find the next word */
807 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
808 (*begin)++;
809 if (*begin >= buffer->size)
810 return -1;
811
812 /* find the end of the word */
813 *end = *begin + 1;
814 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
815 (*end)++;
816
817 return 0;
818 }
819
820 /*
821 * This function splits the words in buffer->text, stores the list with
822 * newline separator into out, and saves the offsets of the original words
823 * in buffer->orig.
824 */
825 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
826 regex_t *word_regex)
827 {
828 int i, j;
829 long alloc = 0;
830
831 out->size = 0;
832 out->ptr = NULL;
833
834 /* fake an empty "0th" word */
835 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
836 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
837 buffer->orig_nr = 1;
838
839 for (i = 0; i < buffer->text.size; i++) {
840 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
841 return;
842
843 /* store original boundaries */
844 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
845 buffer->orig_alloc);
846 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
847 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
848 buffer->orig_nr++;
849
850 /* store one word */
851 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
852 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
853 out->ptr[out->size + j - i] = '\n';
854 out->size += j - i + 1;
855
856 i = j - 1;
857 }
858 }
859
860 /* this executes the word diff on the accumulated buffers */
861 static void diff_words_show(struct diff_words_data *diff_words)
862 {
863 xpparam_t xpp;
864 xdemitconf_t xecfg;
865 mmfile_t minus, plus;
866 struct diff_words_style *style = diff_words->style;
867
868 struct diff_options *opt = diff_words->opt;
869 struct strbuf *msgbuf;
870 char *line_prefix = "";
871
872 assert(opt);
873 if (opt->output_prefix) {
874 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
875 line_prefix = msgbuf->buf;
876 }
877
878 /* special case: only removal */
879 if (!diff_words->plus.text.size) {
880 fputs(line_prefix, diff_words->opt->file);
881 fn_out_diff_words_write_helper(diff_words->opt->file,
882 &style->old, style->newline,
883 diff_words->minus.text.size,
884 diff_words->minus.text.ptr, line_prefix);
885 diff_words->minus.text.size = 0;
886 return;
887 }
888
889 diff_words->current_plus = diff_words->plus.text.ptr;
890 diff_words->last_minus = 0;
891
892 memset(&xpp, 0, sizeof(xpp));
893 memset(&xecfg, 0, sizeof(xecfg));
894 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
895 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
896 xpp.flags = 0;
897 /* as only the hunk header will be parsed, we need a 0-context */
898 xecfg.ctxlen = 0;
899 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
900 &xpp, &xecfg);
901 free(minus.ptr);
902 free(plus.ptr);
903 if (diff_words->current_plus != diff_words->plus.text.ptr +
904 diff_words->plus.text.size) {
905 if (color_words_output_graph_prefix(diff_words))
906 fputs(line_prefix, diff_words->opt->file);
907 fn_out_diff_words_write_helper(diff_words->opt->file,
908 &style->ctx, style->newline,
909 diff_words->plus.text.ptr + diff_words->plus.text.size
910 - diff_words->current_plus, diff_words->current_plus,
911 line_prefix);
912 }
913 diff_words->minus.text.size = diff_words->plus.text.size = 0;
914 }
915
916 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
917 static void diff_words_flush(struct emit_callback *ecbdata)
918 {
919 if (ecbdata->diff_words->minus.text.size ||
920 ecbdata->diff_words->plus.text.size)
921 diff_words_show(ecbdata->diff_words);
922 }
923
924 static void free_diff_words_data(struct emit_callback *ecbdata)
925 {
926 if (ecbdata->diff_words) {
927 diff_words_flush(ecbdata);
928 free (ecbdata->diff_words->minus.text.ptr);
929 free (ecbdata->diff_words->minus.orig);
930 free (ecbdata->diff_words->plus.text.ptr);
931 free (ecbdata->diff_words->plus.orig);
932 if (ecbdata->diff_words->word_regex) {
933 regfree(ecbdata->diff_words->word_regex);
934 free(ecbdata->diff_words->word_regex);
935 }
936 free(ecbdata->diff_words);
937 ecbdata->diff_words = NULL;
938 }
939 }
940
941 const char *diff_get_color(int diff_use_color, enum color_diff ix)
942 {
943 if (diff_use_color)
944 return diff_colors[ix];
945 return "";
946 }
947
948 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
949 {
950 const char *cp;
951 unsigned long allot;
952 size_t l = len;
953
954 if (ecb->truncate)
955 return ecb->truncate(line, len);
956 cp = line;
957 allot = l;
958 while (0 < l) {
959 (void) utf8_width(&cp, &l);
960 if (!cp)
961 break; /* truncated in the middle? */
962 }
963 return allot - l;
964 }
965
966 static void find_lno(const char *line, struct emit_callback *ecbdata)
967 {
968 const char *p;
969 ecbdata->lno_in_preimage = 0;
970 ecbdata->lno_in_postimage = 0;
971 p = strchr(line, '-');
972 if (!p)
973 return; /* cannot happen */
974 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
975 p = strchr(p, '+');
976 if (!p)
977 return; /* cannot happen */
978 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
979 }
980
981 static void fn_out_consume(void *priv, char *line, unsigned long len)
982 {
983 struct emit_callback *ecbdata = priv;
984 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
985 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
986 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
987 struct diff_options *o = ecbdata->opt;
988 char *line_prefix = "";
989 struct strbuf *msgbuf;
990
991 if (o && o->output_prefix) {
992 msgbuf = o->output_prefix(o, o->output_prefix_data);
993 line_prefix = msgbuf->buf;
994 }
995
996 if (ecbdata->header) {
997 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
998 strbuf_reset(ecbdata->header);
999 ecbdata->header = NULL;
1000 }
1001 *(ecbdata->found_changesp) = 1;
1002
1003 if (ecbdata->label_path[0]) {
1004 const char *name_a_tab, *name_b_tab;
1005
1006 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
1007 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
1008
1009 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
1010 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
1011 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
1012 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1013 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1014 }
1015
1016 if (diff_suppress_blank_empty
1017 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1018 line[0] = '\n';
1019 len = 1;
1020 }
1021
1022 if (line[0] == '@') {
1023 if (ecbdata->diff_words)
1024 diff_words_flush(ecbdata);
1025 len = sane_truncate_line(ecbdata, line, len);
1026 find_lno(line, ecbdata);
1027 emit_hunk_header(ecbdata, line, len);
1028 if (line[len-1] != '\n')
1029 putc('\n', ecbdata->opt->file);
1030 return;
1031 }
1032
1033 if (len < 1) {
1034 emit_line(ecbdata->opt, reset, reset, line, len);
1035 if (ecbdata->diff_words
1036 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1037 fputs("~\n", ecbdata->opt->file);
1038 return;
1039 }
1040
1041 if (ecbdata->diff_words) {
1042 if (line[0] == '-') {
1043 diff_words_append(line, len,
1044 &ecbdata->diff_words->minus);
1045 return;
1046 } else if (line[0] == '+') {
1047 diff_words_append(line, len,
1048 &ecbdata->diff_words->plus);
1049 return;
1050 }
1051 diff_words_flush(ecbdata);
1052 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1053 emit_line(ecbdata->opt, plain, reset, line, len);
1054 fputs("~\n", ecbdata->opt->file);
1055 } else {
1056 /* don't print the prefix character */
1057 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1058 }
1059 return;
1060 }
1061
1062 if (line[0] != '+') {
1063 const char *color =
1064 diff_get_color(ecbdata->color_diff,
1065 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1066 ecbdata->lno_in_preimage++;
1067 if (line[0] == ' ')
1068 ecbdata->lno_in_postimage++;
1069 emit_line(ecbdata->opt, color, reset, line, len);
1070 } else {
1071 ecbdata->lno_in_postimage++;
1072 emit_add_line(reset, ecbdata, line + 1, len - 1);
1073 }
1074 }
1075
1076 static char *pprint_rename(const char *a, const char *b)
1077 {
1078 const char *old = a;
1079 const char *new = b;
1080 struct strbuf name = STRBUF_INIT;
1081 int pfx_length, sfx_length;
1082 int len_a = strlen(a);
1083 int len_b = strlen(b);
1084 int a_midlen, b_midlen;
1085 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1086 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1087
1088 if (qlen_a || qlen_b) {
1089 quote_c_style(a, &name, NULL, 0);
1090 strbuf_addstr(&name, " => ");
1091 quote_c_style(b, &name, NULL, 0);
1092 return strbuf_detach(&name, NULL);
1093 }
1094
1095 /* Find common prefix */
1096 pfx_length = 0;
1097 while (*old && *new && *old == *new) {
1098 if (*old == '/')
1099 pfx_length = old - a + 1;
1100 old++;
1101 new++;
1102 }
1103
1104 /* Find common suffix */
1105 old = a + len_a;
1106 new = b + len_b;
1107 sfx_length = 0;
1108 while (a <= old && b <= new && *old == *new) {
1109 if (*old == '/')
1110 sfx_length = len_a - (old - a);
1111 old--;
1112 new--;
1113 }
1114
1115 /*
1116 * pfx{mid-a => mid-b}sfx
1117 * {pfx-a => pfx-b}sfx
1118 * pfx{sfx-a => sfx-b}
1119 * name-a => name-b
1120 */
1121 a_midlen = len_a - pfx_length - sfx_length;
1122 b_midlen = len_b - pfx_length - sfx_length;
1123 if (a_midlen < 0)
1124 a_midlen = 0;
1125 if (b_midlen < 0)
1126 b_midlen = 0;
1127
1128 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1129 if (pfx_length + sfx_length) {
1130 strbuf_add(&name, a, pfx_length);
1131 strbuf_addch(&name, '{');
1132 }
1133 strbuf_add(&name, a + pfx_length, a_midlen);
1134 strbuf_addstr(&name, " => ");
1135 strbuf_add(&name, b + pfx_length, b_midlen);
1136 if (pfx_length + sfx_length) {
1137 strbuf_addch(&name, '}');
1138 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1139 }
1140 return strbuf_detach(&name, NULL);
1141 }
1142
1143 struct diffstat_t {
1144 int nr;
1145 int alloc;
1146 struct diffstat_file {
1147 char *from_name;
1148 char *name;
1149 char *print_name;
1150 unsigned is_unmerged:1;
1151 unsigned is_binary:1;
1152 unsigned is_renamed:1;
1153 uintmax_t added, deleted;
1154 } **files;
1155 };
1156
1157 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1158 const char *name_a,
1159 const char *name_b)
1160 {
1161 struct diffstat_file *x;
1162 x = xcalloc(sizeof (*x), 1);
1163 if (diffstat->nr == diffstat->alloc) {
1164 diffstat->alloc = alloc_nr(diffstat->alloc);
1165 diffstat->files = xrealloc(diffstat->files,
1166 diffstat->alloc * sizeof(x));
1167 }
1168 diffstat->files[diffstat->nr++] = x;
1169 if (name_b) {
1170 x->from_name = xstrdup(name_a);
1171 x->name = xstrdup(name_b);
1172 x->is_renamed = 1;
1173 }
1174 else {
1175 x->from_name = NULL;
1176 x->name = xstrdup(name_a);
1177 }
1178 return x;
1179 }
1180
1181 static void diffstat_consume(void *priv, char *line, unsigned long len)
1182 {
1183 struct diffstat_t *diffstat = priv;
1184 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1185
1186 if (line[0] == '+')
1187 x->added++;
1188 else if (line[0] == '-')
1189 x->deleted++;
1190 }
1191
1192 const char mime_boundary_leader[] = "------------";
1193
1194 static int scale_linear(int it, int width, int max_change)
1195 {
1196 /*
1197 * make sure that at least one '-' is printed if there were deletions,
1198 * and likewise for '+'.
1199 */
1200 if (max_change < 2)
1201 return it;
1202 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1203 }
1204
1205 static void show_name(FILE *file,
1206 const char *prefix, const char *name, int len)
1207 {
1208 fprintf(file, " %s%-*s |", prefix, len, name);
1209 }
1210
1211 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1212 {
1213 if (cnt <= 0)
1214 return;
1215 fprintf(file, "%s", set);
1216 while (cnt--)
1217 putc(ch, file);
1218 fprintf(file, "%s", reset);
1219 }
1220
1221 static void fill_print_name(struct diffstat_file *file)
1222 {
1223 char *pname;
1224
1225 if (file->print_name)
1226 return;
1227
1228 if (!file->is_renamed) {
1229 struct strbuf buf = STRBUF_INIT;
1230 if (quote_c_style(file->name, &buf, NULL, 0)) {
1231 pname = strbuf_detach(&buf, NULL);
1232 } else {
1233 pname = file->name;
1234 strbuf_release(&buf);
1235 }
1236 } else {
1237 pname = pprint_rename(file->from_name, file->name);
1238 }
1239 file->print_name = pname;
1240 }
1241
1242 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1243 {
1244 int i, len, add, del, adds = 0, dels = 0;
1245 uintmax_t max_change = 0, max_len = 0;
1246 int total_files = data->nr;
1247 int width, name_width;
1248 const char *reset, *add_c, *del_c;
1249 const char *line_prefix = "";
1250 struct strbuf *msg = NULL;
1251
1252 if (data->nr == 0)
1253 return;
1254
1255 if (options->output_prefix) {
1256 msg = options->output_prefix(options, options->output_prefix_data);
1257 line_prefix = msg->buf;
1258 }
1259
1260 width = options->stat_width ? options->stat_width : 80;
1261 name_width = options->stat_name_width ? options->stat_name_width : 50;
1262
1263 /* Sanity: give at least 5 columns to the graph,
1264 * but leave at least 10 columns for the name.
1265 */
1266 if (width < 25)
1267 width = 25;
1268 if (name_width < 10)
1269 name_width = 10;
1270 else if (width < name_width + 15)
1271 name_width = width - 15;
1272
1273 /* Find the longest filename and max number of changes */
1274 reset = diff_get_color_opt(options, DIFF_RESET);
1275 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1276 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1277
1278 for (i = 0; i < data->nr; i++) {
1279 struct diffstat_file *file = data->files[i];
1280 uintmax_t change = file->added + file->deleted;
1281 fill_print_name(file);
1282 len = strlen(file->print_name);
1283 if (max_len < len)
1284 max_len = len;
1285
1286 if (file->is_binary || file->is_unmerged)
1287 continue;
1288 if (max_change < change)
1289 max_change = change;
1290 }
1291
1292 /* Compute the width of the graph part;
1293 * 10 is for one blank at the beginning of the line plus
1294 * " | count " between the name and the graph.
1295 *
1296 * From here on, name_width is the width of the name area,
1297 * and width is the width of the graph area.
1298 */
1299 name_width = (name_width < max_len) ? name_width : max_len;
1300 if (width < (name_width + 10) + max_change)
1301 width = width - (name_width + 10);
1302 else
1303 width = max_change;
1304
1305 for (i = 0; i < data->nr; i++) {
1306 const char *prefix = "";
1307 char *name = data->files[i]->print_name;
1308 uintmax_t added = data->files[i]->added;
1309 uintmax_t deleted = data->files[i]->deleted;
1310 int name_len;
1311
1312 /*
1313 * "scale" the filename
1314 */
1315 len = name_width;
1316 name_len = strlen(name);
1317 if (name_width < name_len) {
1318 char *slash;
1319 prefix = "...";
1320 len -= 3;
1321 name += name_len - len;
1322 slash = strchr(name, '/');
1323 if (slash)
1324 name = slash;
1325 }
1326
1327 if (data->files[i]->is_binary) {
1328 fprintf(options->file, "%s", line_prefix);
1329 show_name(options->file, prefix, name, len);
1330 fprintf(options->file, " Bin ");
1331 fprintf(options->file, "%s%"PRIuMAX"%s",
1332 del_c, deleted, reset);
1333 fprintf(options->file, " -> ");
1334 fprintf(options->file, "%s%"PRIuMAX"%s",
1335 add_c, added, reset);
1336 fprintf(options->file, " bytes");
1337 fprintf(options->file, "\n");
1338 continue;
1339 }
1340 else if (data->files[i]->is_unmerged) {
1341 fprintf(options->file, "%s", line_prefix);
1342 show_name(options->file, prefix, name, len);
1343 fprintf(options->file, " Unmerged\n");
1344 continue;
1345 }
1346 else if (!data->files[i]->is_renamed &&
1347 (added + deleted == 0)) {
1348 total_files--;
1349 continue;
1350 }
1351
1352 /*
1353 * scale the add/delete
1354 */
1355 add = added;
1356 del = deleted;
1357 adds += add;
1358 dels += del;
1359
1360 if (width <= max_change) {
1361 add = scale_linear(add, width, max_change);
1362 del = scale_linear(del, width, max_change);
1363 }
1364 fprintf(options->file, "%s", line_prefix);
1365 show_name(options->file, prefix, name, len);
1366 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1367 added + deleted ? " " : "");
1368 show_graph(options->file, '+', add, add_c, reset);
1369 show_graph(options->file, '-', del, del_c, reset);
1370 fprintf(options->file, "\n");
1371 }
1372 fprintf(options->file, "%s", line_prefix);
1373 fprintf(options->file,
1374 " %d files changed, %d insertions(+), %d deletions(-)\n",
1375 total_files, adds, dels);
1376 }
1377
1378 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1379 {
1380 int i, adds = 0, dels = 0, total_files = data->nr;
1381
1382 if (data->nr == 0)
1383 return;
1384
1385 for (i = 0; i < data->nr; i++) {
1386 if (!data->files[i]->is_binary &&
1387 !data->files[i]->is_unmerged) {
1388 int added = data->files[i]->added;
1389 int deleted= data->files[i]->deleted;
1390 if (!data->files[i]->is_renamed &&
1391 (added + deleted == 0)) {
1392 total_files--;
1393 } else {
1394 adds += added;
1395 dels += deleted;
1396 }
1397 }
1398 }
1399 if (options->output_prefix) {
1400 struct strbuf *msg = NULL;
1401 msg = options->output_prefix(options,
1402 options->output_prefix_data);
1403 fprintf(options->file, "%s", msg->buf);
1404 }
1405 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1406 total_files, adds, dels);
1407 }
1408
1409 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1410 {
1411 int i;
1412
1413 if (data->nr == 0)
1414 return;
1415
1416 for (i = 0; i < data->nr; i++) {
1417 struct diffstat_file *file = data->files[i];
1418
1419 if (options->output_prefix) {
1420 struct strbuf *msg = NULL;
1421 msg = options->output_prefix(options,
1422 options->output_prefix_data);
1423 fprintf(options->file, "%s", msg->buf);
1424 }
1425
1426 if (file->is_binary)
1427 fprintf(options->file, "-\t-\t");
1428 else
1429 fprintf(options->file,
1430 "%"PRIuMAX"\t%"PRIuMAX"\t",
1431 file->added, file->deleted);
1432 if (options->line_termination) {
1433 fill_print_name(file);
1434 if (!file->is_renamed)
1435 write_name_quoted(file->name, options->file,
1436 options->line_termination);
1437 else {
1438 fputs(file->print_name, options->file);
1439 putc(options->line_termination, options->file);
1440 }
1441 } else {
1442 if (file->is_renamed) {
1443 putc('\0', options->file);
1444 write_name_quoted(file->from_name, options->file, '\0');
1445 }
1446 write_name_quoted(file->name, options->file, '\0');
1447 }
1448 }
1449 }
1450
1451 struct dirstat_file {
1452 const char *name;
1453 unsigned long changed;
1454 };
1455
1456 struct dirstat_dir {
1457 struct dirstat_file *files;
1458 int alloc, nr, percent, cumulative;
1459 };
1460
1461 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1462 unsigned long changed, const char *base, int baselen)
1463 {
1464 unsigned long this_dir = 0;
1465 unsigned int sources = 0;
1466 const char *line_prefix = "";
1467 struct strbuf *msg = NULL;
1468
1469 if (opt->output_prefix) {
1470 msg = opt->output_prefix(opt, opt->output_prefix_data);
1471 line_prefix = msg->buf;
1472 }
1473
1474 while (dir->nr) {
1475 struct dirstat_file *f = dir->files;
1476 int namelen = strlen(f->name);
1477 unsigned long this;
1478 char *slash;
1479
1480 if (namelen < baselen)
1481 break;
1482 if (memcmp(f->name, base, baselen))
1483 break;
1484 slash = strchr(f->name + baselen, '/');
1485 if (slash) {
1486 int newbaselen = slash + 1 - f->name;
1487 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1488 sources++;
1489 } else {
1490 this = f->changed;
1491 dir->files++;
1492 dir->nr--;
1493 sources += 2;
1494 }
1495 this_dir += this;
1496 }
1497
1498 /*
1499 * We don't report dirstat's for
1500 * - the top level
1501 * - or cases where everything came from a single directory
1502 * under this directory (sources == 1).
1503 */
1504 if (baselen && sources != 1) {
1505 int permille = this_dir * 1000 / changed;
1506 if (permille) {
1507 int percent = permille / 10;
1508 if (percent >= dir->percent) {
1509 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1510 percent, permille % 10, baselen, base);
1511 if (!dir->cumulative)
1512 return 0;
1513 }
1514 }
1515 }
1516 return this_dir;
1517 }
1518
1519 static int dirstat_compare(const void *_a, const void *_b)
1520 {
1521 const struct dirstat_file *a = _a;
1522 const struct dirstat_file *b = _b;
1523 return strcmp(a->name, b->name);
1524 }
1525
1526 static void show_dirstat(struct diff_options *options)
1527 {
1528 int i;
1529 unsigned long changed;
1530 struct dirstat_dir dir;
1531 struct diff_queue_struct *q = &diff_queued_diff;
1532
1533 dir.files = NULL;
1534 dir.alloc = 0;
1535 dir.nr = 0;
1536 dir.percent = options->dirstat_percent;
1537 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1538
1539 changed = 0;
1540 for (i = 0; i < q->nr; i++) {
1541 struct diff_filepair *p = q->queue[i];
1542 const char *name;
1543 unsigned long copied, added, damage;
1544 int content_changed;
1545
1546 name = p->two->path ? p->two->path : p->one->path;
1547
1548 if (p->one->sha1_valid && p->two->sha1_valid)
1549 content_changed = hashcmp(p->one->sha1, p->two->sha1);
1550 else
1551 content_changed = 1;
1552
1553 if (!content_changed) {
1554 /*
1555 * The SHA1 has not changed, so pre-/post-content is
1556 * identical. We can therefore skip looking at the
1557 * file contents altogether.
1558 */
1559 damage = 0;
1560 goto found_damage;
1561 }
1562
1563 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
1564 /*
1565 * In --dirstat-by-file mode, we don't really need to
1566 * look at the actual file contents at all.
1567 * The fact that the SHA1 changed is enough for us to
1568 * add this file to the list of results
1569 * (with each file contributing equal damage).
1570 */
1571 damage = 1;
1572 goto found_damage;
1573 }
1574
1575 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1576 diff_populate_filespec(p->one, 0);
1577 diff_populate_filespec(p->two, 0);
1578 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1579 &copied, &added);
1580 diff_free_filespec_data(p->one);
1581 diff_free_filespec_data(p->two);
1582 } else if (DIFF_FILE_VALID(p->one)) {
1583 diff_populate_filespec(p->one, 1);
1584 copied = added = 0;
1585 diff_free_filespec_data(p->one);
1586 } else if (DIFF_FILE_VALID(p->two)) {
1587 diff_populate_filespec(p->two, 1);
1588 copied = 0;
1589 added = p->two->size;
1590 diff_free_filespec_data(p->two);
1591 } else
1592 continue;
1593
1594 /*
1595 * Original minus copied is the removed material,
1596 * added is the new material. They are both damages
1597 * made to the preimage.
1598 * If the resulting damage is zero, we know that
1599 * diffcore_count_changes() considers the two entries to
1600 * be identical, but since content_changed is true, we
1601 * know that there must have been _some_ kind of change,
1602 * so we force all entries to have damage > 0.
1603 */
1604 damage = (p->one->size - copied) + added;
1605 if (!damage)
1606 damage = 1;
1607
1608 found_damage:
1609 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1610 dir.files[dir.nr].name = name;
1611 dir.files[dir.nr].changed = damage;
1612 changed += damage;
1613 dir.nr++;
1614 }
1615
1616 /* This can happen even with many files, if everything was renames */
1617 if (!changed)
1618 return;
1619
1620 /* Show all directories with more than x% of the changes */
1621 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1622 gather_dirstat(options, &dir, changed, "", 0);
1623 }
1624
1625 static void free_diffstat_info(struct diffstat_t *diffstat)
1626 {
1627 int i;
1628 for (i = 0; i < diffstat->nr; i++) {
1629 struct diffstat_file *f = diffstat->files[i];
1630 if (f->name != f->print_name)
1631 free(f->print_name);
1632 free(f->name);
1633 free(f->from_name);
1634 free(f);
1635 }
1636 free(diffstat->files);
1637 }
1638
1639 struct checkdiff_t {
1640 const char *filename;
1641 int lineno;
1642 int conflict_marker_size;
1643 struct diff_options *o;
1644 unsigned ws_rule;
1645 unsigned status;
1646 };
1647
1648 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1649 {
1650 char firstchar;
1651 int cnt;
1652
1653 if (len < marker_size + 1)
1654 return 0;
1655 firstchar = line[0];
1656 switch (firstchar) {
1657 case '=': case '>': case '<': case '|':
1658 break;
1659 default:
1660 return 0;
1661 }
1662 for (cnt = 1; cnt < marker_size; cnt++)
1663 if (line[cnt] != firstchar)
1664 return 0;
1665 /* line[1] thru line[marker_size-1] are same as firstchar */
1666 if (len < marker_size + 1 || !isspace(line[marker_size]))
1667 return 0;
1668 return 1;
1669 }
1670
1671 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1672 {
1673 struct checkdiff_t *data = priv;
1674 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1675 int marker_size = data->conflict_marker_size;
1676 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1677 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1678 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1679 char *err;
1680 char *line_prefix = "";
1681 struct strbuf *msgbuf;
1682
1683 assert(data->o);
1684 if (data->o->output_prefix) {
1685 msgbuf = data->o->output_prefix(data->o,
1686 data->o->output_prefix_data);
1687 line_prefix = msgbuf->buf;
1688 }
1689
1690 if (line[0] == '+') {
1691 unsigned bad;
1692 data->lineno++;
1693 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1694 data->status |= 1;
1695 fprintf(data->o->file,
1696 "%s%s:%d: leftover conflict marker\n",
1697 line_prefix, data->filename, data->lineno);
1698 }
1699 bad = ws_check(line + 1, len - 1, data->ws_rule);
1700 if (!bad)
1701 return;
1702 data->status |= bad;
1703 err = whitespace_error_string(bad);
1704 fprintf(data->o->file, "%s%s:%d: %s.\n",
1705 line_prefix, data->filename, data->lineno, err);
1706 free(err);
1707 emit_line(data->o, set, reset, line, 1);
1708 ws_check_emit(line + 1, len - 1, data->ws_rule,
1709 data->o->file, set, reset, ws);
1710 } else if (line[0] == ' ') {
1711 data->lineno++;
1712 } else if (line[0] == '@') {
1713 char *plus = strchr(line, '+');
1714 if (plus)
1715 data->lineno = strtol(plus, NULL, 10) - 1;
1716 else
1717 die("invalid diff");
1718 }
1719 }
1720
1721 static unsigned char *deflate_it(char *data,
1722 unsigned long size,
1723 unsigned long *result_size)
1724 {
1725 int bound;
1726 unsigned char *deflated;
1727 z_stream stream;
1728
1729 memset(&stream, 0, sizeof(stream));
1730 deflateInit(&stream, zlib_compression_level);
1731 bound = deflateBound(&stream, size);
1732 deflated = xmalloc(bound);
1733 stream.next_out = deflated;
1734 stream.avail_out = bound;
1735
1736 stream.next_in = (unsigned char *)data;
1737 stream.avail_in = size;
1738 while (deflate(&stream, Z_FINISH) == Z_OK)
1739 ; /* nothing */
1740 deflateEnd(&stream);
1741 *result_size = stream.total_out;
1742 return deflated;
1743 }
1744
1745 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1746 {
1747 void *cp;
1748 void *delta;
1749 void *deflated;
1750 void *data;
1751 unsigned long orig_size;
1752 unsigned long delta_size;
1753 unsigned long deflate_size;
1754 unsigned long data_size;
1755
1756 /* We could do deflated delta, or we could do just deflated two,
1757 * whichever is smaller.
1758 */
1759 delta = NULL;
1760 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1761 if (one->size && two->size) {
1762 delta = diff_delta(one->ptr, one->size,
1763 two->ptr, two->size,
1764 &delta_size, deflate_size);
1765 if (delta) {
1766 void *to_free = delta;
1767 orig_size = delta_size;
1768 delta = deflate_it(delta, delta_size, &delta_size);
1769 free(to_free);
1770 }
1771 }
1772
1773 if (delta && delta_size < deflate_size) {
1774 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1775 free(deflated);
1776 data = delta;
1777 data_size = delta_size;
1778 }
1779 else {
1780 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1781 free(delta);
1782 data = deflated;
1783 data_size = deflate_size;
1784 }
1785
1786 /* emit data encoded in base85 */
1787 cp = data;
1788 while (data_size) {
1789 int bytes = (52 < data_size) ? 52 : data_size;
1790 char line[70];
1791 data_size -= bytes;
1792 if (bytes <= 26)
1793 line[0] = bytes + 'A' - 1;
1794 else
1795 line[0] = bytes - 26 + 'a' - 1;
1796 encode_85(line + 1, cp, bytes);
1797 cp = (char *) cp + bytes;
1798 fprintf(file, "%s", prefix);
1799 fputs(line, file);
1800 fputc('\n', file);
1801 }
1802 fprintf(file, "%s\n", prefix);
1803 free(data);
1804 }
1805
1806 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1807 {
1808 fprintf(file, "%sGIT binary patch\n", prefix);
1809 emit_binary_diff_body(file, one, two, prefix);
1810 emit_binary_diff_body(file, two, one, prefix);
1811 }
1812
1813 static void diff_filespec_load_driver(struct diff_filespec *one)
1814 {
1815 /* Use already-loaded driver */
1816 if (one->driver)
1817 return;
1818
1819 if (S_ISREG(one->mode))
1820 one->driver = userdiff_find_by_path(one->path);
1821
1822 /* Fallback to default settings */
1823 if (!one->driver)
1824 one->driver = userdiff_find_by_name("default");
1825 }
1826
1827 int diff_filespec_is_binary(struct diff_filespec *one)
1828 {
1829 if (one->is_binary == -1) {
1830 diff_filespec_load_driver(one);
1831 if (one->driver->binary != -1)
1832 one->is_binary = one->driver->binary;
1833 else {
1834 if (!one->data && DIFF_FILE_VALID(one))
1835 diff_populate_filespec(one, 0);
1836 if (one->data)
1837 one->is_binary = buffer_is_binary(one->data,
1838 one->size);
1839 if (one->is_binary == -1)
1840 one->is_binary = 0;
1841 }
1842 }
1843 return one->is_binary;
1844 }
1845
1846 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1847 {
1848 diff_filespec_load_driver(one);
1849 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1850 }
1851
1852 static const char *userdiff_word_regex(struct diff_filespec *one)
1853 {
1854 diff_filespec_load_driver(one);
1855 return one->driver->word_regex;
1856 }
1857
1858 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1859 {
1860 if (!options->a_prefix)
1861 options->a_prefix = a;
1862 if (!options->b_prefix)
1863 options->b_prefix = b;
1864 }
1865
1866 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1867 {
1868 if (!DIFF_FILE_VALID(one))
1869 return NULL;
1870
1871 diff_filespec_load_driver(one);
1872 if (!one->driver->textconv)
1873 return NULL;
1874
1875 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1876 struct notes_cache *c = xmalloc(sizeof(*c));
1877 struct strbuf name = STRBUF_INIT;
1878
1879 strbuf_addf(&name, "textconv/%s", one->driver->name);
1880 notes_cache_init(c, name.buf, one->driver->textconv);
1881 one->driver->textconv_cache = c;
1882 }
1883
1884 return one->driver;
1885 }
1886
1887 static void builtin_diff(const char *name_a,
1888 const char *name_b,
1889 struct diff_filespec *one,
1890 struct diff_filespec *two,
1891 const char *xfrm_msg,
1892 int must_show_header,
1893 struct diff_options *o,
1894 int complete_rewrite)
1895 {
1896 mmfile_t mf1, mf2;
1897 const char *lbl[2];
1898 char *a_one, *b_two;
1899 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1900 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1901 const char *a_prefix, *b_prefix;
1902 struct userdiff_driver *textconv_one = NULL;
1903 struct userdiff_driver *textconv_two = NULL;
1904 struct strbuf header = STRBUF_INIT;
1905 struct strbuf *msgbuf;
1906 char *line_prefix = "";
1907
1908 if (o->output_prefix) {
1909 msgbuf = o->output_prefix(o, o->output_prefix_data);
1910 line_prefix = msgbuf->buf;
1911 }
1912
1913 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1914 (!one->mode || S_ISGITLINK(one->mode)) &&
1915 (!two->mode || S_ISGITLINK(two->mode))) {
1916 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1917 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1918 show_submodule_summary(o->file, one ? one->path : two->path,
1919 one->sha1, two->sha1, two->dirty_submodule,
1920 del, add, reset);
1921 return;
1922 }
1923
1924 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1925 textconv_one = get_textconv(one);
1926 textconv_two = get_textconv(two);
1927 }
1928
1929 diff_set_mnemonic_prefix(o, "a/", "b/");
1930 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1931 a_prefix = o->b_prefix;
1932 b_prefix = o->a_prefix;
1933 } else {
1934 a_prefix = o->a_prefix;
1935 b_prefix = o->b_prefix;
1936 }
1937
1938 /* Never use a non-valid filename anywhere if at all possible */
1939 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1940 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1941
1942 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1943 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1944 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1945 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1946 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1947 if (lbl[0][0] == '/') {
1948 /* /dev/null */
1949 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1950 if (xfrm_msg)
1951 strbuf_addstr(&header, xfrm_msg);
1952 must_show_header = 1;
1953 }
1954 else if (lbl[1][0] == '/') {
1955 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1956 if (xfrm_msg)
1957 strbuf_addstr(&header, xfrm_msg);
1958 must_show_header = 1;
1959 }
1960 else {
1961 if (one->mode != two->mode) {
1962 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1963 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1964 must_show_header = 1;
1965 }
1966 if (xfrm_msg)
1967 strbuf_addstr(&header, xfrm_msg);
1968
1969 /*
1970 * we do not run diff between different kind
1971 * of objects.
1972 */
1973 if ((one->mode ^ two->mode) & S_IFMT)
1974 goto free_ab_and_return;
1975 if (complete_rewrite &&
1976 (textconv_one || !diff_filespec_is_binary(one)) &&
1977 (textconv_two || !diff_filespec_is_binary(two))) {
1978 fprintf(o->file, "%s", header.buf);
1979 strbuf_reset(&header);
1980 emit_rewrite_diff(name_a, name_b, one, two,
1981 textconv_one, textconv_two, o);
1982 o->found_changes = 1;
1983 goto free_ab_and_return;
1984 }
1985 }
1986
1987 if (o->irreversible_delete && lbl[1][0] == '/') {
1988 fprintf(o->file, "%s", header.buf);
1989 strbuf_reset(&header);
1990 goto free_ab_and_return;
1991 } else if (!DIFF_OPT_TST(o, TEXT) &&
1992 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1993 (!textconv_two && diff_filespec_is_binary(two)) )) {
1994 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1995 die("unable to read files to diff");
1996 /* Quite common confusing case */
1997 if (mf1.size == mf2.size &&
1998 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1999 if (must_show_header)
2000 fprintf(o->file, "%s", header.buf);
2001 goto free_ab_and_return;
2002 }
2003 fprintf(o->file, "%s", header.buf);
2004 strbuf_reset(&header);
2005 if (DIFF_OPT_TST(o, BINARY))
2006 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
2007 else
2008 fprintf(o->file, "%sBinary files %s and %s differ\n",
2009 line_prefix, lbl[0], lbl[1]);
2010 o->found_changes = 1;
2011 } else {
2012 /* Crazy xdl interfaces.. */
2013 const char *diffopts = getenv("GIT_DIFF_OPTS");
2014 xpparam_t xpp;
2015 xdemitconf_t xecfg;
2016 struct emit_callback ecbdata;
2017 const struct userdiff_funcname *pe;
2018
2019 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
2020 fprintf(o->file, "%s", header.buf);
2021 strbuf_reset(&header);
2022 }
2023
2024 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
2025 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
2026
2027 pe = diff_funcname_pattern(one);
2028 if (!pe)
2029 pe = diff_funcname_pattern(two);
2030
2031 memset(&xpp, 0, sizeof(xpp));
2032 memset(&xecfg, 0, sizeof(xecfg));
2033 memset(&ecbdata, 0, sizeof(ecbdata));
2034 ecbdata.label_path = lbl;
2035 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
2036 ecbdata.found_changesp = &o->found_changes;
2037 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
2038 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
2039 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2040 ecbdata.opt = o;
2041 ecbdata.header = header.len ? &header : NULL;
2042 xpp.flags = o->xdl_opts;
2043 xecfg.ctxlen = o->context;
2044 xecfg.interhunkctxlen = o->interhunkcontext;
2045 xecfg.flags = XDL_EMIT_FUNCNAMES;
2046 if (pe)
2047 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
2048 if (!diffopts)
2049 ;
2050 else if (!prefixcmp(diffopts, "--unified="))
2051 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2052 else if (!prefixcmp(diffopts, "-u"))
2053 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2054 if (o->word_diff) {
2055 int i;
2056
2057 ecbdata.diff_words =
2058 xcalloc(1, sizeof(struct diff_words_data));
2059 ecbdata.diff_words->type = o->word_diff;
2060 ecbdata.diff_words->opt = o;
2061 if (!o->word_regex)
2062 o->word_regex = userdiff_word_regex(one);
2063 if (!o->word_regex)
2064 o->word_regex = userdiff_word_regex(two);
2065 if (!o->word_regex)
2066 o->word_regex = diff_word_regex_cfg;
2067 if (o->word_regex) {
2068 ecbdata.diff_words->word_regex = (regex_t *)
2069 xmalloc(sizeof(regex_t));
2070 if (regcomp(ecbdata.diff_words->word_regex,
2071 o->word_regex,
2072 REG_EXTENDED | REG_NEWLINE))
2073 die ("Invalid regular expression: %s",
2074 o->word_regex);
2075 }
2076 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2077 if (o->word_diff == diff_words_styles[i].type) {
2078 ecbdata.diff_words->style =
2079 &diff_words_styles[i];
2080 break;
2081 }
2082 }
2083 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2084 struct diff_words_style *st = ecbdata.diff_words->style;
2085 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2086 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2087 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2088 }
2089 }
2090 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2091 &xpp, &xecfg);
2092 if (o->word_diff)
2093 free_diff_words_data(&ecbdata);
2094 if (textconv_one)
2095 free(mf1.ptr);
2096 if (textconv_two)
2097 free(mf2.ptr);
2098 xdiff_clear_find_func(&xecfg);
2099 }
2100
2101 free_ab_and_return:
2102 strbuf_release(&header);
2103 diff_free_filespec_data(one);
2104 diff_free_filespec_data(two);
2105 free(a_one);
2106 free(b_two);
2107 return;
2108 }
2109
2110 static void builtin_diffstat(const char *name_a, const char *name_b,
2111 struct diff_filespec *one,
2112 struct diff_filespec *two,
2113 struct diffstat_t *diffstat,
2114 struct diff_options *o,
2115 int complete_rewrite)
2116 {
2117 mmfile_t mf1, mf2;
2118 struct diffstat_file *data;
2119
2120 data = diffstat_add(diffstat, name_a, name_b);
2121
2122 if (!one || !two) {
2123 data->is_unmerged = 1;
2124 return;
2125 }
2126
2127 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2128 data->is_binary = 1;
2129 data->added = diff_filespec_size(two);
2130 data->deleted = diff_filespec_size(one);
2131 }
2132
2133 else if (complete_rewrite) {
2134 diff_populate_filespec(one, 0);
2135 diff_populate_filespec(two, 0);
2136 data->deleted = count_lines(one->data, one->size);
2137 data->added = count_lines(two->data, two->size);
2138 }
2139
2140 else {
2141 /* Crazy xdl interfaces.. */
2142 xpparam_t xpp;
2143 xdemitconf_t xecfg;
2144
2145 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2146 die("unable to read files to diff");
2147
2148 memset(&xpp, 0, sizeof(xpp));
2149 memset(&xecfg, 0, sizeof(xecfg));
2150 xpp.flags = o->xdl_opts;
2151 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2152 &xpp, &xecfg);
2153 }
2154
2155 diff_free_filespec_data(one);
2156 diff_free_filespec_data(two);
2157 }
2158
2159 static void builtin_checkdiff(const char *name_a, const char *name_b,
2160 const char *attr_path,
2161 struct diff_filespec *one,
2162 struct diff_filespec *two,
2163 struct diff_options *o)
2164 {
2165 mmfile_t mf1, mf2;
2166 struct checkdiff_t data;
2167
2168 if (!two)
2169 return;
2170
2171 memset(&data, 0, sizeof(data));
2172 data.filename = name_b ? name_b : name_a;
2173 data.lineno = 0;
2174 data.o = o;
2175 data.ws_rule = whitespace_rule(attr_path);
2176 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2177
2178 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2179 die("unable to read files to diff");
2180
2181 /*
2182 * All the other codepaths check both sides, but not checking
2183 * the "old" side here is deliberate. We are checking the newly
2184 * introduced changes, and as long as the "new" side is text, we
2185 * can and should check what it introduces.
2186 */
2187 if (diff_filespec_is_binary(two))
2188 goto free_and_return;
2189 else {
2190 /* Crazy xdl interfaces.. */
2191 xpparam_t xpp;
2192 xdemitconf_t xecfg;
2193
2194 memset(&xpp, 0, sizeof(xpp));
2195 memset(&xecfg, 0, sizeof(xecfg));
2196 xecfg.ctxlen = 1; /* at least one context line */
2197 xpp.flags = 0;
2198 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2199 &xpp, &xecfg);
2200
2201 if (data.ws_rule & WS_BLANK_AT_EOF) {
2202 struct emit_callback ecbdata;
2203 int blank_at_eof;
2204
2205 ecbdata.ws_rule = data.ws_rule;
2206 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2207 blank_at_eof = ecbdata.blank_at_eof_in_postimage;
2208
2209 if (blank_at_eof) {
2210 static char *err;
2211 if (!err)
2212 err = whitespace_error_string(WS_BLANK_AT_EOF);
2213 fprintf(o->file, "%s:%d: %s.\n",
2214 data.filename, blank_at_eof, err);
2215 data.status = 1; /* report errors */
2216 }
2217 }
2218 }
2219 free_and_return:
2220 diff_free_filespec_data(one);
2221 diff_free_filespec_data(two);
2222 if (data.status)
2223 DIFF_OPT_SET(o, CHECK_FAILED);
2224 }
2225
2226 struct diff_filespec *alloc_filespec(const char *path)
2227 {
2228 int namelen = strlen(path);
2229 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2230
2231 memset(spec, 0, sizeof(*spec));
2232 spec->path = (char *)(spec + 1);
2233 memcpy(spec->path, path, namelen+1);
2234 spec->count = 1;
2235 spec->is_binary = -1;
2236 return spec;
2237 }
2238
2239 void free_filespec(struct diff_filespec *spec)
2240 {
2241 if (!--spec->count) {
2242 diff_free_filespec_data(spec);
2243 free(spec);
2244 }
2245 }
2246
2247 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2248 unsigned short mode)
2249 {
2250 if (mode) {
2251 spec->mode = canon_mode(mode);
2252 hashcpy(spec->sha1, sha1);
2253 spec->sha1_valid = !is_null_sha1(sha1);
2254 }
2255 }
2256
2257 /*
2258 * Given a name and sha1 pair, if the index tells us the file in
2259 * the work tree has that object contents, return true, so that
2260 * prepare_temp_file() does not have to inflate and extract.
2261 */
2262 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2263 {
2264 struct cache_entry *ce;
2265 struct stat st;
2266 int pos, len;
2267
2268 /*
2269 * We do not read the cache ourselves here, because the
2270 * benchmark with my previous version that always reads cache
2271 * shows that it makes things worse for diff-tree comparing
2272 * two linux-2.6 kernel trees in an already checked out work
2273 * tree. This is because most diff-tree comparisons deal with
2274 * only a small number of files, while reading the cache is
2275 * expensive for a large project, and its cost outweighs the
2276 * savings we get by not inflating the object to a temporary
2277 * file. Practically, this code only helps when we are used
2278 * by diff-cache --cached, which does read the cache before
2279 * calling us.
2280 */
2281 if (!active_cache)
2282 return 0;
2283
2284 /* We want to avoid the working directory if our caller
2285 * doesn't need the data in a normal file, this system
2286 * is rather slow with its stat/open/mmap/close syscalls,
2287 * and the object is contained in a pack file. The pack
2288 * is probably already open and will be faster to obtain
2289 * the data through than the working directory. Loose
2290 * objects however would tend to be slower as they need
2291 * to be individually opened and inflated.
2292 */
2293 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2294 return 0;
2295
2296 len = strlen(name);
2297 pos = cache_name_pos(name, len);
2298 if (pos < 0)
2299 return 0;
2300 ce = active_cache[pos];
2301
2302 /*
2303 * This is not the sha1 we are looking for, or
2304 * unreusable because it is not a regular file.
2305 */
2306 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2307 return 0;
2308
2309 /*
2310 * If ce is marked as "assume unchanged", there is no
2311 * guarantee that work tree matches what we are looking for.
2312 */
2313 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2314 return 0;
2315
2316 /*
2317 * If ce matches the file in the work tree, we can reuse it.
2318 */
2319 if (ce_uptodate(ce) ||
2320 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2321 return 1;
2322
2323 return 0;
2324 }
2325
2326 static int populate_from_stdin(struct diff_filespec *s)
2327 {
2328 struct strbuf buf = STRBUF_INIT;
2329 size_t size = 0;
2330
2331 if (strbuf_read(&buf, 0, 0) < 0)
2332 return error("error while reading from stdin %s",
2333 strerror(errno));
2334
2335 s->should_munmap = 0;
2336 s->data = strbuf_detach(&buf, &size);
2337 s->size = size;
2338 s->should_free = 1;
2339 return 0;
2340 }
2341
2342 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2343 {
2344 int len;
2345 char *data = xmalloc(100), *dirty = "";
2346
2347 /* Are we looking at the work tree? */
2348 if (s->dirty_submodule)
2349 dirty = "-dirty";
2350
2351 len = snprintf(data, 100,
2352 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2353 s->data = data;
2354 s->size = len;
2355 s->should_free = 1;
2356 if (size_only) {
2357 s->data = NULL;
2358 free(data);
2359 }
2360 return 0;
2361 }
2362
2363 /*
2364 * While doing rename detection and pickaxe operation, we may need to
2365 * grab the data for the blob (or file) for our own in-core comparison.
2366 * diff_filespec has data and size fields for this purpose.
2367 */
2368 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2369 {
2370 int err = 0;
2371 if (!DIFF_FILE_VALID(s))
2372 die("internal error: asking to populate invalid file.");
2373 if (S_ISDIR(s->mode))
2374 return -1;
2375
2376 if (s->data)
2377 return 0;
2378
2379 if (size_only && 0 < s->size)
2380 return 0;
2381
2382 if (S_ISGITLINK(s->mode))
2383 return diff_populate_gitlink(s, size_only);
2384
2385 if (!s->sha1_valid ||
2386 reuse_worktree_file(s->path, s->sha1, 0)) {
2387 struct strbuf buf = STRBUF_INIT;
2388 struct stat st;
2389 int fd;
2390
2391 if (!strcmp(s->path, "-"))
2392 return populate_from_stdin(s);
2393
2394 if (lstat(s->path, &st) < 0) {
2395 if (errno == ENOENT) {
2396 err_empty:
2397 err = -1;
2398 empty:
2399 s->data = (char *)"";
2400 s->size = 0;
2401 return err;
2402 }
2403 }
2404 s->size = xsize_t(st.st_size);
2405 if (!s->size)
2406 goto empty;
2407 if (S_ISLNK(st.st_mode)) {
2408 struct strbuf sb = STRBUF_INIT;
2409
2410 if (strbuf_readlink(&sb, s->path, s->size))
2411 goto err_empty;
2412 s->size = sb.len;
2413 s->data = strbuf_detach(&sb, NULL);
2414 s->should_free = 1;
2415 return 0;
2416 }
2417 if (size_only)
2418 return 0;
2419 fd = open(s->path, O_RDONLY);
2420 if (fd < 0)
2421 goto err_empty;
2422 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2423 close(fd);
2424 s->should_munmap = 1;
2425
2426 /*
2427 * Convert from working tree format to canonical git format
2428 */
2429 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2430 size_t size = 0;
2431 munmap(s->data, s->size);
2432 s->should_munmap = 0;
2433 s->data = strbuf_detach(&buf, &size);
2434 s->size = size;
2435 s->should_free = 1;
2436 }
2437 }
2438 else {
2439 enum object_type type;
2440 if (size_only) {
2441 type = sha1_object_info(s->sha1, &s->size);
2442 if (type < 0)
2443 die("unable to read %s", sha1_to_hex(s->sha1));
2444 } else {
2445 s->data = read_sha1_file(s->sha1, &type, &s->size);
2446 if (!s->data)
2447 die("unable to read %s", sha1_to_hex(s->sha1));
2448 s->should_free = 1;
2449 }
2450 }
2451 return 0;
2452 }
2453
2454 void diff_free_filespec_blob(struct diff_filespec *s)
2455 {
2456 if (s->should_free)
2457 free(s->data);
2458 else if (s->should_munmap)
2459 munmap(s->data, s->size);
2460
2461 if (s->should_free || s->should_munmap) {
2462 s->should_free = s->should_munmap = 0;
2463 s->data = NULL;
2464 }
2465 }
2466
2467 void diff_free_filespec_data(struct diff_filespec *s)
2468 {
2469 diff_free_filespec_blob(s);
2470 free(s->cnt_data);
2471 s->cnt_data = NULL;
2472 }
2473
2474 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2475 void *blob,
2476 unsigned long size,
2477 const unsigned char *sha1,
2478 int mode)
2479 {
2480 int fd;
2481 struct strbuf buf = STRBUF_INIT;
2482 struct strbuf template = STRBUF_INIT;
2483 char *path_dup = xstrdup(path);
2484 const char *base = basename(path_dup);
2485
2486 /* Generate "XXXXXX_basename.ext" */
2487 strbuf_addstr(&template, "XXXXXX_");
2488 strbuf_addstr(&template, base);
2489
2490 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2491 strlen(base) + 1);
2492 if (fd < 0)
2493 die_errno("unable to create temp-file");
2494 if (convert_to_working_tree(path,
2495 (const char *)blob, (size_t)size, &buf)) {
2496 blob = buf.buf;
2497 size = buf.len;
2498 }
2499 if (write_in_full(fd, blob, size) != size)
2500 die_errno("unable to write temp-file");
2501 close(fd);
2502 temp->name = temp->tmp_path;
2503 strcpy(temp->hex, sha1_to_hex(sha1));
2504 temp->hex[40] = 0;
2505 sprintf(temp->mode, "%06o", mode);
2506 strbuf_release(&buf);
2507 strbuf_release(&template);
2508 free(path_dup);
2509 }
2510
2511 static struct diff_tempfile *prepare_temp_file(const char *name,
2512 struct diff_filespec *one)
2513 {
2514 struct diff_tempfile *temp = claim_diff_tempfile();
2515
2516 if (!DIFF_FILE_VALID(one)) {
2517 not_a_valid_file:
2518 /* A '-' entry produces this for file-2, and
2519 * a '+' entry produces this for file-1.
2520 */
2521 temp->name = "/dev/null";
2522 strcpy(temp->hex, ".");
2523 strcpy(temp->mode, ".");
2524 return temp;
2525 }
2526
2527 if (!remove_tempfile_installed) {
2528 atexit(remove_tempfile);
2529 sigchain_push_common(remove_tempfile_on_signal);
2530 remove_tempfile_installed = 1;
2531 }
2532
2533 if (!one->sha1_valid ||
2534 reuse_worktree_file(name, one->sha1, 1)) {
2535 struct stat st;
2536 if (lstat(name, &st) < 0) {
2537 if (errno == ENOENT)
2538 goto not_a_valid_file;
2539 die_errno("stat(%s)", name);
2540 }
2541 if (S_ISLNK(st.st_mode)) {
2542 struct strbuf sb = STRBUF_INIT;
2543 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2544 die_errno("readlink(%s)", name);
2545 prep_temp_blob(name, temp, sb.buf, sb.len,
2546 (one->sha1_valid ?
2547 one->sha1 : null_sha1),
2548 (one->sha1_valid ?
2549 one->mode : S_IFLNK));
2550 strbuf_release(&sb);
2551 }
2552 else {
2553 /* we can borrow from the file in the work tree */
2554 temp->name = name;
2555 if (!one->sha1_valid)
2556 strcpy(temp->hex, sha1_to_hex(null_sha1));
2557 else
2558 strcpy(temp->hex, sha1_to_hex(one->sha1));
2559 /* Even though we may sometimes borrow the
2560 * contents from the work tree, we always want
2561 * one->mode. mode is trustworthy even when
2562 * !(one->sha1_valid), as long as
2563 * DIFF_FILE_VALID(one).
2564 */
2565 sprintf(temp->mode, "%06o", one->mode);
2566 }
2567 return temp;
2568 }
2569 else {
2570 if (diff_populate_filespec(one, 0))
2571 die("cannot read data blob for %s", one->path);
2572 prep_temp_blob(name, temp, one->data, one->size,
2573 one->sha1, one->mode);
2574 }
2575 return temp;
2576 }
2577
2578 /* An external diff command takes:
2579 *
2580 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2581 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2582 *
2583 */
2584 static void run_external_diff(const char *pgm,
2585 const char *name,
2586 const char *other,
2587 struct diff_filespec *one,
2588 struct diff_filespec *two,
2589 const char *xfrm_msg,
2590 int complete_rewrite)
2591 {
2592 const char *spawn_arg[10];
2593 int retval;
2594 const char **arg = &spawn_arg[0];
2595
2596 if (one && two) {
2597 struct diff_tempfile *temp_one, *temp_two;
2598 const char *othername = (other ? other : name);
2599 temp_one = prepare_temp_file(name, one);
2600 temp_two = prepare_temp_file(othername, two);
2601 *arg++ = pgm;
2602 *arg++ = name;
2603 *arg++ = temp_one->name;
2604 *arg++ = temp_one->hex;
2605 *arg++ = temp_one->mode;
2606 *arg++ = temp_two->name;
2607 *arg++ = temp_two->hex;
2608 *arg++ = temp_two->mode;
2609 if (other) {
2610 *arg++ = other;
2611 *arg++ = xfrm_msg;
2612 }
2613 } else {
2614 *arg++ = pgm;
2615 *arg++ = name;
2616 }
2617 *arg = NULL;
2618 fflush(NULL);
2619 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2620 remove_tempfile();
2621 if (retval) {
2622 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2623 exit(1);
2624 }
2625 }
2626
2627 static int similarity_index(struct diff_filepair *p)
2628 {
2629 return p->score * 100 / MAX_SCORE;
2630 }
2631
2632 static void fill_metainfo(struct strbuf *msg,
2633 const char *name,
2634 const char *other,
2635 struct diff_filespec *one,
2636 struct diff_filespec *two,
2637 struct diff_options *o,
2638 struct diff_filepair *p,
2639 int *must_show_header,
2640 int use_color)
2641 {
2642 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2643 const char *reset = diff_get_color(use_color, DIFF_RESET);
2644 struct strbuf *msgbuf;
2645 char *line_prefix = "";
2646
2647 *must_show_header = 1;
2648 if (o->output_prefix) {
2649 msgbuf = o->output_prefix(o, o->output_prefix_data);
2650 line_prefix = msgbuf->buf;
2651 }
2652 strbuf_init(msg, PATH_MAX * 2 + 300);
2653 switch (p->status) {
2654 case DIFF_STATUS_COPIED:
2655 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2656 line_prefix, set, similarity_index(p));
2657 strbuf_addf(msg, "%s\n%s%scopy from ",
2658 reset, line_prefix, set);
2659 quote_c_style(name, msg, NULL, 0);
2660 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2661 quote_c_style(other, msg, NULL, 0);
2662 strbuf_addf(msg, "%s\n", reset);
2663 break;
2664 case DIFF_STATUS_RENAMED:
2665 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2666 line_prefix, set, similarity_index(p));
2667 strbuf_addf(msg, "%s\n%s%srename from ",
2668 reset, line_prefix, set);
2669 quote_c_style(name, msg, NULL, 0);
2670 strbuf_addf(msg, "%s\n%s%srename to ",
2671 reset, line_prefix, set);
2672 quote_c_style(other, msg, NULL, 0);
2673 strbuf_addf(msg, "%s\n", reset);
2674 break;
2675 case DIFF_STATUS_MODIFIED:
2676 if (p->score) {
2677 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2678 line_prefix,
2679 set, similarity_index(p), reset);
2680 break;
2681 }
2682 /* fallthru */
2683 default:
2684 *must_show_header = 0;
2685 }
2686 if (one && two && hashcmp(one->sha1, two->sha1)) {
2687 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2688
2689 if (DIFF_OPT_TST(o, BINARY)) {
2690 mmfile_t mf;
2691 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2692 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2693 abbrev = 40;
2694 }
2695 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2696 find_unique_abbrev(one->sha1, abbrev));
2697 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2698 if (one->mode == two->mode)
2699 strbuf_addf(msg, " %06o", one->mode);
2700 strbuf_addf(msg, "%s\n", reset);
2701 }
2702 }
2703
2704 static void run_diff_cmd(const char *pgm,
2705 const char *name,
2706 const char *other,
2707 const char *attr_path,
2708 struct diff_filespec *one,
2709 struct diff_filespec *two,
2710 struct strbuf *msg,
2711 struct diff_options *o,
2712 struct diff_filepair *p)
2713 {
2714 const char *xfrm_msg = NULL;
2715 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2716 int must_show_header = 0;
2717
2718 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2719 pgm = NULL;
2720 else {
2721 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2722 if (drv && drv->external)
2723 pgm = drv->external;
2724 }
2725
2726 if (msg) {
2727 /*
2728 * don't use colors when the header is intended for an
2729 * external diff driver
2730 */
2731 fill_metainfo(msg, name, other, one, two, o, p,
2732 &must_show_header,
2733 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2734 xfrm_msg = msg->len ? msg->buf : NULL;
2735 }
2736
2737 if (pgm) {
2738 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2739 complete_rewrite);
2740 return;
2741 }
2742 if (one && two)
2743 builtin_diff(name, other ? other : name,
2744 one, two, xfrm_msg, must_show_header,
2745 o, complete_rewrite);
2746 else
2747 fprintf(o->file, "* Unmerged path %s\n", name);
2748 }
2749
2750 static void diff_fill_sha1_info(struct diff_filespec *one)
2751 {
2752 if (DIFF_FILE_VALID(one)) {
2753 if (!one->sha1_valid) {
2754 struct stat st;
2755 if (!strcmp(one->path, "-")) {
2756 hashcpy(one->sha1, null_sha1);
2757 return;
2758 }
2759 if (lstat(one->path, &st) < 0)
2760 die_errno("stat '%s'", one->path);
2761 if (index_path(one->sha1, one->path, &st, 0))
2762 die("cannot hash %s", one->path);
2763 }
2764 }
2765 else
2766 hashclr(one->sha1);
2767 }
2768
2769 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2770 {
2771 /* Strip the prefix but do not molest /dev/null and absolute paths */
2772 if (*namep && **namep != '/') {
2773 *namep += prefix_length;
2774 if (**namep == '/')
2775 ++*namep;
2776 }
2777 if (*otherp && **otherp != '/') {
2778 *otherp += prefix_length;
2779 if (**otherp == '/')
2780 ++*otherp;
2781 }
2782 }
2783
2784 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2785 {
2786 const char *pgm = external_diff();
2787 struct strbuf msg;
2788 struct diff_filespec *one = p->one;
2789 struct diff_filespec *two = p->two;
2790 const char *name;
2791 const char *other;
2792 const char *attr_path;
2793
2794 name = p->one->path;
2795 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2796 attr_path = name;
2797 if (o->prefix_length)
2798 strip_prefix(o->prefix_length, &name, &other);
2799
2800 if (DIFF_PAIR_UNMERGED(p)) {
2801 run_diff_cmd(pgm, name, NULL, attr_path,
2802 NULL, NULL, NULL, o, p);
2803 return;
2804 }
2805
2806 diff_fill_sha1_info(one);
2807 diff_fill_sha1_info(two);
2808
2809 if (!pgm &&
2810 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2811 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2812 /*
2813 * a filepair that changes between file and symlink
2814 * needs to be split into deletion and creation.
2815 */
2816 struct diff_filespec *null = alloc_filespec(two->path);
2817 run_diff_cmd(NULL, name, other, attr_path,
2818 one, null, &msg, o, p);
2819 free(null);
2820 strbuf_release(&msg);
2821
2822 null = alloc_filespec(one->path);
2823 run_diff_cmd(NULL, name, other, attr_path,
2824 null, two, &msg, o, p);
2825 free(null);
2826 }
2827 else
2828 run_diff_cmd(pgm, name, other, attr_path,
2829 one, two, &msg, o, p);
2830
2831 strbuf_release(&msg);
2832 }
2833
2834 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2835 struct diffstat_t *diffstat)
2836 {
2837 const char *name;
2838 const char *other;
2839 int complete_rewrite = 0;
2840
2841 if (DIFF_PAIR_UNMERGED(p)) {
2842 /* unmerged */
2843 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2844 return;
2845 }
2846
2847 name = p->one->path;
2848 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2849
2850 if (o->prefix_length)
2851 strip_prefix(o->prefix_length, &name, &other);
2852
2853 diff_fill_sha1_info(p->one);
2854 diff_fill_sha1_info(p->two);
2855
2856 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2857 complete_rewrite = 1;
2858 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2859 }
2860
2861 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2862 {
2863 const char *name;
2864 const char *other;
2865 const char *attr_path;
2866
2867 if (DIFF_PAIR_UNMERGED(p)) {
2868 /* unmerged */
2869 return;
2870 }
2871
2872 name = p->one->path;
2873 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2874 attr_path = other ? other : name;
2875
2876 if (o->prefix_length)
2877 strip_prefix(o->prefix_length, &name, &other);
2878
2879 diff_fill_sha1_info(p->one);
2880 diff_fill_sha1_info(p->two);
2881
2882 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2883 }
2884
2885 void diff_setup(struct diff_options *options)
2886 {
2887 memcpy(options, &default_diff_options, sizeof(*options));
2888
2889 options->file = stdout;
2890
2891 options->line_termination = '\n';
2892 options->break_opt = -1;
2893 options->rename_limit = -1;
2894 options->dirstat_percent = 3;
2895 options->context = 3;
2896
2897 options->change = diff_change;
2898 options->add_remove = diff_addremove;
2899 if (diff_use_color_default > 0)
2900 DIFF_OPT_SET(options, COLOR_DIFF);
2901 options->detect_rename = diff_detect_rename_default;
2902
2903 if (diff_no_prefix) {
2904 options->a_prefix = options->b_prefix = "";
2905 } else if (!diff_mnemonic_prefix) {
2906 options->a_prefix = "a/";
2907 options->b_prefix = "b/";
2908 }
2909 }
2910
2911 int diff_setup_done(struct diff_options *options)
2912 {
2913 int count = 0;
2914
2915 if (options->output_format & DIFF_FORMAT_NAME)
2916 count++;
2917 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2918 count++;
2919 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2920 count++;
2921 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2922 count++;
2923 if (count > 1)
2924 die("--name-only, --name-status, --check and -s are mutually exclusive");
2925
2926 /*
2927 * Most of the time we can say "there are changes"
2928 * only by checking if there are changed paths, but
2929 * --ignore-whitespace* options force us to look
2930 * inside contents.
2931 */
2932
2933 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2934 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2935 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2936 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2937 else
2938 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2939
2940 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2941 options->detect_rename = DIFF_DETECT_COPY;
2942
2943 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2944 options->prefix = NULL;
2945 if (options->prefix)
2946 options->prefix_length = strlen(options->prefix);
2947 else
2948 options->prefix_length = 0;
2949
2950 if (options->output_format & (DIFF_FORMAT_NAME |
2951 DIFF_FORMAT_NAME_STATUS |
2952 DIFF_FORMAT_CHECKDIFF |
2953 DIFF_FORMAT_NO_OUTPUT))
2954 options->output_format &= ~(DIFF_FORMAT_RAW |
2955 DIFF_FORMAT_NUMSTAT |
2956 DIFF_FORMAT_DIFFSTAT |
2957 DIFF_FORMAT_SHORTSTAT |
2958 DIFF_FORMAT_DIRSTAT |
2959 DIFF_FORMAT_SUMMARY |
2960 DIFF_FORMAT_PATCH);
2961
2962 /*
2963 * These cases always need recursive; we do not drop caller-supplied
2964 * recursive bits for other formats here.
2965 */
2966 if (options->output_format & (DIFF_FORMAT_PATCH |
2967 DIFF_FORMAT_NUMSTAT |
2968 DIFF_FORMAT_DIFFSTAT |
2969 DIFF_FORMAT_SHORTSTAT |
2970 DIFF_FORMAT_DIRSTAT |
2971 DIFF_FORMAT_SUMMARY |
2972 DIFF_FORMAT_CHECKDIFF))
2973 DIFF_OPT_SET(options, RECURSIVE);
2974 /*
2975 * Also pickaxe would not work very well if you do not say recursive
2976 */
2977 if (options->pickaxe)
2978 DIFF_OPT_SET(options, RECURSIVE);
2979 /*
2980 * When patches are generated, submodules diffed against the work tree
2981 * must be checked for dirtiness too so it can be shown in the output
2982 */
2983 if (options->output_format & DIFF_FORMAT_PATCH)
2984 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2985
2986 if (options->detect_rename && options->rename_limit < 0)
2987 options->rename_limit = diff_rename_limit_default;
2988 if (options->setup & DIFF_SETUP_USE_CACHE) {
2989 if (!active_cache)
2990 /* read-cache does not die even when it fails
2991 * so it is safe for us to do this here. Also
2992 * it does not smudge active_cache or active_nr
2993 * when it fails, so we do not have to worry about
2994 * cleaning it up ourselves either.
2995 */
2996 read_cache();
2997 }
2998 if (options->abbrev <= 0 || 40 < options->abbrev)
2999 options->abbrev = 40; /* full */
3000
3001 /*
3002 * It does not make sense to show the first hit we happened
3003 * to have found. It does not make sense not to return with
3004 * exit code in such a case either.
3005 */
3006 if (DIFF_OPT_TST(options, QUICK)) {
3007 options->output_format = DIFF_FORMAT_NO_OUTPUT;
3008 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3009 }
3010
3011 return 0;
3012 }
3013
3014 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
3015 {
3016 char c, *eq;
3017 int len;
3018
3019 if (*arg != '-')
3020 return 0;
3021 c = *++arg;
3022 if (!c)
3023 return 0;
3024 if (c == arg_short) {
3025 c = *++arg;
3026 if (!c)
3027 return 1;
3028 if (val && isdigit(c)) {
3029 char *end;
3030 int n = strtoul(arg, &end, 10);
3031 if (*end)
3032 return 0;
3033 *val = n;
3034 return 1;
3035 }
3036 return 0;
3037 }
3038 if (c != '-')
3039 return 0;
3040 arg++;
3041 eq = strchr(arg, '=');
3042 if (eq)
3043 len = eq - arg;
3044 else
3045 len = strlen(arg);
3046 if (!len || strncmp(arg, arg_long, len))
3047 return 0;
3048 if (eq) {
3049 int n;
3050 char *end;
3051 if (!isdigit(*++eq))
3052 return 0;
3053 n = strtoul(eq, &end, 10);
3054 if (*end)
3055 return 0;
3056 *val = n;
3057 }
3058 return 1;
3059 }
3060
3061 static int diff_scoreopt_parse(const char *opt);
3062
3063 static inline int short_opt(char opt, const char **argv,
3064 const char **optarg)
3065 {
3066 const char *arg = argv[0];
3067 if (arg[0] != '-' || arg[1] != opt)
3068 return 0;
3069 if (arg[2] != '\0') {
3070 *optarg = arg + 2;
3071 return 1;
3072 }
3073 if (!argv[1])
3074 die("Option '%c' requires a value", opt);
3075 *optarg = argv[1];
3076 return 2;
3077 }
3078
3079 int parse_long_opt(const char *opt, const char **argv,
3080 const char **optarg)
3081 {
3082 const char *arg = argv[0];
3083 if (arg[0] != '-' || arg[1] != '-')
3084 return 0;
3085 arg += strlen("--");
3086 if (prefixcmp(arg, opt))
3087 return 0;
3088 arg += strlen(opt);
3089 if (*arg == '=') { /* sticked form: --option=value */
3090 *optarg = arg + 1;
3091 return 1;
3092 }
3093 if (*arg != '\0')
3094 return 0;
3095 /* separate form: --option value */
3096 if (!argv[1])
3097 die("Option '--%s' requires a value", opt);
3098 *optarg = argv[1];
3099 return 2;
3100 }
3101
3102 static int stat_opt(struct diff_options *options, const char **av)
3103 {
3104 const char *arg = av[0];
3105 char *end;
3106 int width = options->stat_width;
3107 int name_width = options->stat_name_width;
3108 int argcount = 1;
3109
3110 arg += strlen("--stat");
3111 end = (char *)arg;
3112
3113 switch (*arg) {
3114 case '-':
3115 if (!prefixcmp(arg, "-width")) {
3116 arg += strlen("-width");
3117 if (*arg == '=')
3118 width = strtoul(arg + 1, &end, 10);
3119 else if (!*arg && !av[1])
3120 die("Option '--stat-width' requires a value");
3121 else if (!*arg) {
3122 width = strtoul(av[1], &end, 10);
3123 argcount = 2;
3124 }
3125 } else if (!prefixcmp(arg, "-name-width")) {
3126 arg += strlen("-name-width");
3127 if (*arg == '=')
3128 name_width = strtoul(arg + 1, &end, 10);
3129 else if (!*arg && !av[1])
3130 die("Option '--stat-name-width' requires a value");
3131 else if (!*arg) {
3132 name_width = strtoul(av[1], &end, 10);
3133 argcount = 2;
3134 }
3135 }
3136 break;
3137 case '=':
3138 width = strtoul(arg+1, &end, 10);
3139 if (*end == ',')
3140 name_width = strtoul(end+1, &end, 10);
3141 }
3142
3143 /* Important! This checks all the error cases! */
3144 if (*end)
3145 return 0;
3146 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3147 options->stat_name_width = name_width;
3148 options->stat_width = width;
3149 return argcount;
3150 }
3151
3152 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3153 {
3154 const char *arg = av[0];
3155 const char *optarg;
3156 int argcount;
3157
3158 /* Output format options */
3159 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3160 options->output_format |= DIFF_FORMAT_PATCH;
3161 else if (opt_arg(arg, 'U', "unified", &options->context))
3162 options->output_format |= DIFF_FORMAT_PATCH;
3163 else if (!strcmp(arg, "--raw"))
3164 options->output_format |= DIFF_FORMAT_RAW;
3165 else if (!strcmp(arg, "--patch-with-raw"))
3166 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3167 else if (!strcmp(arg, "--numstat"))
3168 options->output_format |= DIFF_FORMAT_NUMSTAT;
3169 else if (!strcmp(arg, "--shortstat"))
3170 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3171 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3172 options->output_format |= DIFF_FORMAT_DIRSTAT;
3173 else if (!strcmp(arg, "--cumulative")) {
3174 options->output_format |= DIFF_FORMAT_DIRSTAT;
3175 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3176 } else if (opt_arg(arg, 0, "dirstat-by-file",
3177 &options->dirstat_percent)) {
3178 options->output_format |= DIFF_FORMAT_DIRSTAT;
3179 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3180 }
3181 else if (!strcmp(arg, "--check"))
3182 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3183 else if (!strcmp(arg, "--summary"))
3184 options->output_format |= DIFF_FORMAT_SUMMARY;
3185 else if (!strcmp(arg, "--patch-with-stat"))
3186 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3187 else if (!strcmp(arg, "--name-only"))
3188 options->output_format |= DIFF_FORMAT_NAME;
3189 else if (!strcmp(arg, "--name-status"))
3190 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3191 else if (!strcmp(arg, "-s"))
3192 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3193 else if (!prefixcmp(arg, "--stat"))
3194 /* --stat, --stat-width, or --stat-name-width */
3195 return stat_opt(options, av);
3196
3197 /* renames options */
3198 else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
3199 !strcmp(arg, "--break-rewrites")) {
3200 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3201 return error("invalid argument to -B: %s", arg+2);
3202 }
3203 else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--find-renames=") ||
3204 !strcmp(arg, "--find-renames")) {
3205 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3206 return error("invalid argument to -M: %s", arg+2);
3207 options->detect_rename = DIFF_DETECT_RENAME;
3208 }
3209 else if (!strcmp(arg, "-D") || !strcmp(arg, "--irreversible-delete")) {
3210 options->irreversible_delete = 1;
3211 }
3212 else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--find-copies=") ||
3213 !strcmp(arg, "--find-copies")) {
3214 if (options->detect_rename == DIFF_DETECT_COPY)
3215 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3216 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3217 return error("invalid argument to -C: %s", arg+2);
3218 options->detect_rename = DIFF_DETECT_COPY;
3219 }
3220 else if (!strcmp(arg, "--no-renames"))
3221 options->detect_rename = 0;
3222 else if (!strcmp(arg, "--relative"))
3223 DIFF_OPT_SET(options, RELATIVE_NAME);
3224 else if (!prefixcmp(arg, "--relative=")) {
3225 DIFF_OPT_SET(options, RELATIVE_NAME);
3226 options->prefix = arg + 11;
3227 }
3228
3229 /* xdiff options */
3230 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3231 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3232 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3233 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3234 else if (!strcmp(arg, "--ignore-space-at-eol"))
3235 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3236 else if (!strcmp(arg, "--patience"))
3237 DIFF_XDL_SET(options, PATIENCE_DIFF);
3238
3239 /* flags options */
3240 else if (!strcmp(arg, "--binary")) {
3241 options->output_format |= DIFF_FORMAT_PATCH;
3242 DIFF_OPT_SET(options, BINARY);
3243 }
3244 else if (!strcmp(arg, "--full-index"))
3245 DIFF_OPT_SET(options, FULL_INDEX);
3246 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3247 DIFF_OPT_SET(options, TEXT);
3248 else if (!strcmp(arg, "-R"))
3249 DIFF_OPT_SET(options, REVERSE_DIFF);
3250 else if (!strcmp(arg, "--find-copies-harder"))
3251 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3252 else if (!strcmp(arg, "--follow"))
3253 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3254 else if (!strcmp(arg, "--color"))
3255 DIFF_OPT_SET(options, COLOR_DIFF);
3256 else if (!prefixcmp(arg, "--color=")) {
3257 int value = git_config_colorbool(NULL, arg+8, -1);
3258 if (value == 0)
3259 DIFF_OPT_CLR(options, COLOR_DIFF);
3260 else if (value > 0)
3261 DIFF_OPT_SET(options, COLOR_DIFF);
3262 else
3263 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3264 }
3265 else if (!strcmp(arg, "--no-color"))
3266 DIFF_OPT_CLR(options, COLOR_DIFF);
3267 else if (!strcmp(arg, "--color-words")) {
3268 DIFF_OPT_SET(options, COLOR_DIFF);
3269 options->word_diff = DIFF_WORDS_COLOR;
3270 }
3271 else if (!prefixcmp(arg, "--color-words=")) {
3272 DIFF_OPT_SET(options, COLOR_DIFF);
3273 options->word_diff = DIFF_WORDS_COLOR;
3274 options->word_regex = arg + 14;
3275 }
3276 else if (!strcmp(arg, "--word-diff")) {
3277 if (options->word_diff == DIFF_WORDS_NONE)
3278 options->word_diff = DIFF_WORDS_PLAIN;
3279 }
3280 else if (!prefixcmp(arg, "--word-diff=")) {
3281 const char *type = arg + 12;
3282 if (!strcmp(type, "plain"))
3283 options->word_diff = DIFF_WORDS_PLAIN;
3284 else if (!strcmp(type, "color")) {
3285 DIFF_OPT_SET(options, COLOR_DIFF);
3286 options->word_diff = DIFF_WORDS_COLOR;
3287 }
3288 else if (!strcmp(type, "porcelain"))
3289 options->word_diff = DIFF_WORDS_PORCELAIN;
3290 else if (!strcmp(type, "none"))
3291 options->word_diff = DIFF_WORDS_NONE;
3292 else
3293 die("bad --word-diff argument: %s", type);
3294 }
3295 else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
3296 if (options->word_diff == DIFF_WORDS_NONE)
3297 options->word_diff = DIFF_WORDS_PLAIN;
3298 options->word_regex = optarg;
3299 return argcount;
3300 }
3301 else if (!strcmp(arg, "--exit-code"))
3302 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3303 else if (!strcmp(arg, "--quiet"))
3304 DIFF_OPT_SET(options, QUICK);
3305 else if (!strcmp(arg, "--ext-diff"))
3306 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3307 else if (!strcmp(arg, "--no-ext-diff"))
3308 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3309 else if (!strcmp(arg, "--textconv"))
3310 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3311 else if (!strcmp(arg, "--no-textconv"))
3312 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3313 else if (!strcmp(arg, "--ignore-submodules")) {
3314 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3315 handle_ignore_submodules_arg(options, "all");
3316 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3317 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3318 handle_ignore_submodules_arg(options, arg + 20);
3319 } else if (!strcmp(arg, "--submodule"))
3320 DIFF_OPT_SET(options, SUBMODULE_LOG);
3321 else if (!prefixcmp(arg, "--submodule=")) {
3322 if (!strcmp(arg + 12, "log"))
3323 DIFF_OPT_SET(options, SUBMODULE_LOG);
3324 }
3325
3326 /* misc options */
3327 else if (!strcmp(arg, "-z"))
3328 options->line_termination = 0;
3329 else if ((argcount = short_opt('l', av, &optarg))) {
3330 options->rename_limit = strtoul(optarg, NULL, 10);
3331 return argcount;
3332 }
3333 else if ((argcount = short_opt('S', av, &optarg))) {
3334 options->pickaxe = optarg;
3335 options->pickaxe_opts |= DIFF_PICKAXE_KIND_S;
3336 return argcount;
3337 } else if ((argcount = short_opt('G', av, &optarg))) {
3338 options->pickaxe = optarg;
3339 options->pickaxe_opts |= DIFF_PICKAXE_KIND_G;
3340 return argcount;
3341 }
3342 else if (!strcmp(arg, "--pickaxe-all"))
3343 options->pickaxe_opts |= DIFF_PICKAXE_ALL;
3344 else if (!strcmp(arg, "--pickaxe-regex"))
3345 options->pickaxe_opts |= DIFF_PICKAXE_REGEX;
3346 else if ((argcount = short_opt('O', av, &optarg))) {
3347 options->orderfile = optarg;
3348 return argcount;
3349 }
3350 else if ((argcount = parse_long_opt("diff-filter", av, &optarg))) {
3351 options->filter = optarg;
3352 return argcount;
3353 }
3354 else if (!strcmp(arg, "--abbrev"))
3355 options->abbrev = DEFAULT_ABBREV;
3356 else if (!prefixcmp(arg, "--abbrev=")) {
3357 options->abbrev = strtoul(arg + 9, NULL, 10);
3358 if (options->abbrev < MINIMUM_ABBREV)
3359 options->abbrev = MINIMUM_ABBREV;
3360 else if (40 < options->abbrev)
3361 options->abbrev = 40;
3362 }
3363 else if ((argcount = parse_long_opt("src-prefix", av, &optarg))) {
3364 options->a_prefix = optarg;
3365 return argcount;
3366 }
3367 else if ((argcount = parse_long_opt("dst-prefix", av, &optarg))) {
3368 options->b_prefix = optarg;
3369 return argcount;
3370 }
3371 else if (!strcmp(arg, "--no-prefix"))
3372 options->a_prefix = options->b_prefix = "";
3373 else if (opt_arg(arg, '\0', "inter-hunk-context",
3374 &options->interhunkcontext))
3375 ;
3376 else if ((argcount = parse_long_opt("output", av, &optarg))) {
3377 options->file = fopen(optarg, "w");
3378 if (!options->file)
3379 die_errno("Could not open '%s'", optarg);
3380 options->close_file = 1;
3381 return argcount;
3382 } else
3383 return 0;
3384 return 1;
3385 }
3386
3387 int parse_rename_score(const char **cp_p)
3388 {
3389 unsigned long num, scale;
3390 int ch, dot;
3391 const char *cp = *cp_p;
3392
3393 num = 0;
3394 scale = 1;
3395 dot = 0;
3396 for (;;) {
3397 ch = *cp;
3398 if ( !dot && ch == '.' ) {
3399 scale = 1;
3400 dot = 1;
3401 } else if ( ch == '%' ) {
3402 scale = dot ? scale*100 : 100;
3403 cp++; /* % is always at the end */
3404 break;
3405 } else if ( ch >= '0' && ch <= '9' ) {
3406 if ( scale < 100000 ) {
3407 scale *= 10;
3408 num = (num*10) + (ch-'0');
3409 }
3410 } else {
3411 break;
3412 }
3413 cp++;
3414 }
3415 *cp_p = cp;
3416
3417 /* user says num divided by scale and we say internally that
3418 * is MAX_SCORE * num / scale.
3419 */
3420 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3421 }
3422
3423 static int diff_scoreopt_parse(const char *opt)
3424 {
3425 int opt1, opt2, cmd;
3426
3427 if (*opt++ != '-')
3428 return -1;
3429 cmd = *opt++;
3430 if (cmd == '-') {
3431 /* convert the long-form arguments into short-form versions */
3432 if (!prefixcmp(opt, "break-rewrites")) {
3433 opt += strlen("break-rewrites");
3434 if (*opt == 0 || *opt++ == '=')
3435 cmd = 'B';
3436 } else if (!prefixcmp(opt, "find-copies")) {
3437 opt += strlen("find-copies");
3438 if (*opt == 0 || *opt++ == '=')
3439 cmd = 'C';
3440 } else if (!prefixcmp(opt, "find-renames")) {
3441 opt += strlen("find-renames");
3442 if (*opt == 0 || *opt++ == '=')
3443 cmd = 'M';
3444 }
3445 }
3446 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3447 return -1; /* that is not a -M, -C nor -B option */
3448
3449 opt1 = parse_rename_score(&opt);
3450 if (cmd != 'B')
3451 opt2 = 0;
3452 else {
3453 if (*opt == 0)
3454 opt2 = 0;
3455 else if (*opt != '/')
3456 return -1; /* we expect -B80/99 or -B80 */
3457 else {
3458 opt++;
3459 opt2 = parse_rename_score(&opt);
3460 }
3461 }
3462 if (*opt != 0)
3463 return -1;
3464 return opt1 | (opt2 << 16);
3465 }
3466
3467 struct diff_queue_struct diff_queued_diff;
3468
3469 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3470 {
3471 if (queue->alloc <= queue->nr) {
3472 queue->alloc = alloc_nr(queue->alloc);
3473 queue->queue = xrealloc(queue->queue,
3474 sizeof(dp) * queue->alloc);
3475 }
3476 queue->queue[queue->nr++] = dp;
3477 }
3478
3479 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3480 struct diff_filespec *one,
3481 struct diff_filespec *two)
3482 {
3483 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3484 dp->one = one;
3485 dp->two = two;
3486 if (queue)
3487 diff_q(queue, dp);
3488 return dp;
3489 }
3490
3491 void diff_free_filepair(struct diff_filepair *p)
3492 {
3493 free_filespec(p->one);
3494 free_filespec(p->two);
3495 free(p);
3496 }
3497
3498 /* This is different from find_unique_abbrev() in that
3499 * it stuffs the result with dots for alignment.
3500 */
3501 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3502 {
3503 int abblen;
3504 const char *abbrev;
3505 if (len == 40)
3506 return sha1_to_hex(sha1);
3507
3508 abbrev = find_unique_abbrev(sha1, len);
3509 abblen = strlen(abbrev);
3510 if (abblen < 37) {
3511 static char hex[41];
3512 if (len < abblen && abblen <= len + 2)
3513 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3514 else
3515 sprintf(hex, "%s...", abbrev);
3516 return hex;
3517 }
3518 return sha1_to_hex(sha1);
3519 }
3520
3521 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3522 {
3523 int line_termination = opt->line_termination;
3524 int inter_name_termination = line_termination ? '\t' : '\0';
3525 if (opt->output_prefix) {
3526 struct strbuf *msg = NULL;
3527 msg = opt->output_prefix(opt, opt->output_prefix_data);
3528 fprintf(opt->file, "%s", msg->buf);
3529 }
3530
3531 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3532 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3533 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3534 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3535 }
3536 if (p->score) {
3537 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3538 inter_name_termination);
3539 } else {
3540 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3541 }
3542
3543 if (p->status == DIFF_STATUS_COPIED ||
3544 p->status == DIFF_STATUS_RENAMED) {
3545 const char *name_a, *name_b;
3546 name_a = p->one->path;
3547 name_b = p->two->path;
3548 strip_prefix(opt->prefix_length, &name_a, &name_b);
3549 write_name_quoted(name_a, opt->file, inter_name_termination);
3550 write_name_quoted(name_b, opt->file, line_termination);
3551 } else {
3552 const char *name_a, *name_b;
3553 name_a = p->one->mode ? p->one->path : p->two->path;
3554 name_b = NULL;
3555 strip_prefix(opt->prefix_length, &name_a, &name_b);
3556 write_name_quoted(name_a, opt->file, line_termination);
3557 }
3558 }
3559
3560 int diff_unmodified_pair(struct diff_filepair *p)
3561 {
3562 /* This function is written stricter than necessary to support
3563 * the currently implemented transformers, but the idea is to
3564 * let transformers to produce diff_filepairs any way they want,
3565 * and filter and clean them up here before producing the output.
3566 */
3567 struct diff_filespec *one = p->one, *two = p->two;
3568
3569 if (DIFF_PAIR_UNMERGED(p))
3570 return 0; /* unmerged is interesting */
3571
3572 /* deletion, addition, mode or type change
3573 * and rename are all interesting.
3574 */
3575 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3576 DIFF_PAIR_MODE_CHANGED(p) ||
3577 strcmp(one->path, two->path))
3578 return 0;
3579
3580 /* both are valid and point at the same path. that is, we are
3581 * dealing with a change.
3582 */
3583 if (one->sha1_valid && two->sha1_valid &&
3584 !hashcmp(one->sha1, two->sha1) &&
3585 !one->dirty_submodule && !two->dirty_submodule)
3586 return 1; /* no change */
3587 if (!one->sha1_valid && !two->sha1_valid)
3588 return 1; /* both look at the same file on the filesystem. */
3589 return 0;
3590 }
3591
3592 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3593 {
3594 if (diff_unmodified_pair(p))
3595 return;
3596
3597 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3598 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3599 return; /* no tree diffs in patch format */
3600
3601 run_diff(p, o);
3602 }
3603
3604 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3605 struct diffstat_t *diffstat)
3606 {
3607 if (diff_unmodified_pair(p))
3608 return;
3609
3610 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3611 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3612 return; /* no useful stat for tree diffs */
3613
3614 run_diffstat(p, o, diffstat);
3615 }
3616
3617 static void diff_flush_checkdiff(struct diff_filepair *p,
3618 struct diff_options *o)
3619 {
3620 if (diff_unmodified_pair(p))
3621 return;
3622
3623 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3624 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3625 return; /* nothing to check in tree diffs */
3626
3627 run_checkdiff(p, o);
3628 }
3629
3630 int diff_queue_is_empty(void)
3631 {
3632 struct diff_queue_struct *q = &diff_queued_diff;
3633 int i;
3634 for (i = 0; i < q->nr; i++)
3635 if (!diff_unmodified_pair(q->queue[i]))
3636 return 0;
3637 return 1;
3638 }
3639
3640 #if DIFF_DEBUG
3641 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3642 {
3643 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3644 x, one ? one : "",
3645 s->path,
3646 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3647 s->mode,
3648 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3649 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3650 x, one ? one : "",
3651 s->size, s->xfrm_flags);
3652 }
3653
3654 void diff_debug_filepair(const struct diff_filepair *p, int i)
3655 {
3656 diff_debug_filespec(p->one, i, "one");
3657 diff_debug_filespec(p->two, i, "two");
3658 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3659 p->score, p->status ? p->status : '?',
3660 p->one->rename_used, p->broken_pair);
3661 }
3662
3663 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3664 {
3665 int i;
3666 if (msg)
3667 fprintf(stderr, "%s\n", msg);
3668 fprintf(stderr, "q->nr = %d\n", q->nr);
3669 for (i = 0; i < q->nr; i++) {
3670 struct diff_filepair *p = q->queue[i];
3671 diff_debug_filepair(p, i);
3672 }
3673 }
3674 #endif
3675
3676 static void diff_resolve_rename_copy(void)
3677 {
3678 int i;
3679 struct diff_filepair *p;
3680 struct diff_queue_struct *q = &diff_queued_diff;
3681
3682 diff_debug_queue("resolve-rename-copy", q);
3683
3684 for (i = 0; i < q->nr; i++) {
3685 p = q->queue[i];
3686 p->status = 0; /* undecided */
3687 if (DIFF_PAIR_UNMERGED(p))
3688 p->status = DIFF_STATUS_UNMERGED;
3689 else if (!DIFF_FILE_VALID(p->one))
3690 p->status = DIFF_STATUS_ADDED;
3691 else if (!DIFF_FILE_VALID(p->two))
3692 p->status = DIFF_STATUS_DELETED;
3693 else if (DIFF_PAIR_TYPE_CHANGED(p))
3694 p->status = DIFF_STATUS_TYPE_CHANGED;
3695
3696 /* from this point on, we are dealing with a pair
3697 * whose both sides are valid and of the same type, i.e.
3698 * either in-place edit or rename/copy edit.
3699 */
3700 else if (DIFF_PAIR_RENAME(p)) {
3701 /*
3702 * A rename might have re-connected a broken
3703 * pair up, causing the pathnames to be the
3704 * same again. If so, that's not a rename at
3705 * all, just a modification..
3706 *
3707 * Otherwise, see if this source was used for
3708 * multiple renames, in which case we decrement
3709 * the count, and call it a copy.
3710 */
3711 if (!strcmp(p->one->path, p->two->path))
3712 p->status = DIFF_STATUS_MODIFIED;
3713 else if (--p->one->rename_used > 0)
3714 p->status = DIFF_STATUS_COPIED;
3715 else
3716 p->status = DIFF_STATUS_RENAMED;
3717 }
3718 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3719 p->one->mode != p->two->mode ||
3720 p->one->dirty_submodule ||
3721 p->two->dirty_submodule ||
3722 is_null_sha1(p->one->sha1))
3723 p->status = DIFF_STATUS_MODIFIED;
3724 else {
3725 /* This is a "no-change" entry and should not
3726 * happen anymore, but prepare for broken callers.
3727 */
3728 error("feeding unmodified %s to diffcore",
3729 p->one->path);
3730 p->status = DIFF_STATUS_UNKNOWN;
3731 }
3732 }
3733 diff_debug_queue("resolve-rename-copy done", q);
3734 }
3735
3736 static int check_pair_status(struct diff_filepair *p)
3737 {
3738 switch (p->status) {
3739 case DIFF_STATUS_UNKNOWN:
3740 return 0;
3741 case 0:
3742 die("internal error in diff-resolve-rename-copy");
3743 default:
3744 return 1;
3745 }
3746 }
3747
3748 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3749 {
3750 int fmt = opt->output_format;
3751
3752 if (fmt & DIFF_FORMAT_CHECKDIFF)
3753 diff_flush_checkdiff(p, opt);
3754 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3755 diff_flush_raw(p, opt);
3756 else if (fmt & DIFF_FORMAT_NAME) {
3757 const char *name_a, *name_b;
3758 name_a = p->two->path;
3759 name_b = NULL;
3760 strip_prefix(opt->prefix_length, &name_a, &name_b);
3761 write_name_quoted(name_a, opt->file, opt->line_termination);
3762 }
3763 }
3764
3765 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3766 {
3767 if (fs->mode)
3768 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3769 else
3770 fprintf(file, " %s ", newdelete);
3771 write_name_quoted(fs->path, file, '\n');
3772 }
3773
3774
3775 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3776 const char *line_prefix)
3777 {
3778 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3779 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3780 p->two->mode, show_name ? ' ' : '\n');
3781 if (show_name) {
3782 write_name_quoted(p->two->path, file, '\n');
3783 }
3784 }
3785 }
3786
3787 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3788 const char *line_prefix)
3789 {
3790 char *names = pprint_rename(p->one->path, p->two->path);
3791
3792 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3793 free(names);
3794 show_mode_change(file, p, 0, line_prefix);
3795 }
3796
3797 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3798 {
3799 FILE *file = opt->file;
3800 char *line_prefix = "";
3801
3802 if (opt->output_prefix) {
3803 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3804 line_prefix = buf->buf;
3805 }
3806
3807 switch(p->status) {
3808 case DIFF_STATUS_DELETED:
3809 fputs(line_prefix, file);
3810 show_file_mode_name(file, "delete", p->one);
3811 break;
3812 case DIFF_STATUS_ADDED:
3813 fputs(line_prefix, file);
3814 show_file_mode_name(file, "create", p->two);
3815 break;
3816 case DIFF_STATUS_COPIED:
3817 fputs(line_prefix, file);
3818 show_rename_copy(file, "copy", p, line_prefix);
3819 break;
3820 case DIFF_STATUS_RENAMED:
3821 fputs(line_prefix, file);
3822 show_rename_copy(file, "rename", p, line_prefix);
3823 break;
3824 default:
3825 if (p->score) {
3826 fprintf(file, "%s rewrite ", line_prefix);
3827 write_name_quoted(p->two->path, file, ' ');
3828 fprintf(file, "(%d%%)\n", similarity_index(p));
3829 }
3830 show_mode_change(file, p, !p->score, line_prefix);
3831 break;
3832 }
3833 }
3834
3835 struct patch_id_t {
3836 git_SHA_CTX *ctx;
3837 int patchlen;
3838 };
3839
3840 static int remove_space(char *line, int len)
3841 {
3842 int i;
3843 char *dst = line;
3844 unsigned char c;
3845
3846 for (i = 0; i < len; i++)
3847 if (!isspace((c = line[i])))
3848 *dst++ = c;
3849
3850 return dst - line;
3851 }
3852
3853 static void patch_id_consume(void *priv, char *line, unsigned long len)
3854 {
3855 struct patch_id_t *data = priv;
3856 int new_len;
3857
3858 /* Ignore line numbers when computing the SHA1 of the patch */
3859 if (!prefixcmp(line, "@@ -"))
3860 return;
3861
3862 new_len = remove_space(line, len);
3863
3864 git_SHA1_Update(data->ctx, line, new_len);
3865 data->patchlen += new_len;
3866 }
3867
3868 /* returns 0 upon success, and writes result into sha1 */
3869 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3870 {
3871 struct diff_queue_struct *q = &diff_queued_diff;
3872 int i;
3873 git_SHA_CTX ctx;
3874 struct patch_id_t data;
3875 char buffer[PATH_MAX * 4 + 20];
3876
3877 git_SHA1_Init(&ctx);
3878 memset(&data, 0, sizeof(struct patch_id_t));
3879 data.ctx = &ctx;
3880
3881 for (i = 0; i < q->nr; i++) {
3882 xpparam_t xpp;
3883 xdemitconf_t xecfg;
3884 mmfile_t mf1, mf2;
3885 struct diff_filepair *p = q->queue[i];
3886 int len1, len2;
3887
3888 memset(&xpp, 0, sizeof(xpp));
3889 memset(&xecfg, 0, sizeof(xecfg));
3890 if (p->status == 0)
3891 return error("internal diff status error");
3892 if (p->status == DIFF_STATUS_UNKNOWN)
3893 continue;
3894 if (diff_unmodified_pair(p))
3895 continue;
3896 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3897 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3898 continue;
3899 if (DIFF_PAIR_UNMERGED(p))
3900 continue;
3901
3902 diff_fill_sha1_info(p->one);
3903 diff_fill_sha1_info(p->two);
3904 if (fill_mmfile(&mf1, p->one) < 0 ||
3905 fill_mmfile(&mf2, p->two) < 0)
3906 return error("unable to read files to diff");
3907
3908 len1 = remove_space(p->one->path, strlen(p->one->path));
3909 len2 = remove_space(p->two->path, strlen(p->two->path));
3910 if (p->one->mode == 0)
3911 len1 = snprintf(buffer, sizeof(buffer),
3912 "diff--gita/%.*sb/%.*s"
3913 "newfilemode%06o"
3914 "---/dev/null"
3915 "+++b/%.*s",
3916 len1, p->one->path,
3917 len2, p->two->path,
3918 p->two->mode,
3919 len2, p->two->path);
3920 else if (p->two->mode == 0)
3921 len1 = snprintf(buffer, sizeof(buffer),
3922 "diff--gita/%.*sb/%.*s"
3923 "deletedfilemode%06o"
3924 "---a/%.*s"
3925 "+++/dev/null",
3926 len1, p->one->path,
3927 len2, p->two->path,
3928 p->one->mode,
3929 len1, p->one->path);
3930 else
3931 len1 = snprintf(buffer, sizeof(buffer),
3932 "diff--gita/%.*sb/%.*s"
3933 "---a/%.*s"
3934 "+++b/%.*s",
3935 len1, p->one->path,
3936 len2, p->two->path,
3937 len1, p->one->path,
3938 len2, p->two->path);
3939 git_SHA1_Update(&ctx, buffer, len1);
3940
3941 if (diff_filespec_is_binary(p->one) ||
3942 diff_filespec_is_binary(p->two)) {
3943 git_SHA1_Update(&ctx, sha1_to_hex(p->one->sha1), 40);
3944 git_SHA1_Update(&ctx, sha1_to_hex(p->two->sha1), 40);
3945 continue;
3946 }
3947
3948 xpp.flags = 0;
3949 xecfg.ctxlen = 3;
3950 xecfg.flags = 0;
3951 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3952 &xpp, &xecfg);
3953 }
3954
3955 git_SHA1_Final(sha1, &ctx);
3956 return 0;
3957 }
3958
3959 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3960 {
3961 struct diff_queue_struct *q = &diff_queued_diff;
3962 int i;
3963 int result = diff_get_patch_id(options, sha1);
3964
3965 for (i = 0; i < q->nr; i++)
3966 diff_free_filepair(q->queue[i]);
3967
3968 free(q->queue);
3969 DIFF_QUEUE_CLEAR(q);
3970
3971 return result;
3972 }
3973
3974 static int is_summary_empty(const struct diff_queue_struct *q)
3975 {
3976 int i;
3977
3978 for (i = 0; i < q->nr; i++) {
3979 const struct diff_filepair *p = q->queue[i];
3980
3981 switch (p->status) {
3982 case DIFF_STATUS_DELETED:
3983 case DIFF_STATUS_ADDED:
3984 case DIFF_STATUS_COPIED:
3985 case DIFF_STATUS_RENAMED:
3986 return 0;
3987 default:
3988 if (p->score)
3989 return 0;
3990 if (p->one->mode && p->two->mode &&
3991 p->one->mode != p->two->mode)
3992 return 0;
3993 break;
3994 }
3995 }
3996 return 1;
3997 }
3998
3999 static const char rename_limit_warning[] =
4000 "inexact rename detection was skipped due to too many files.";
4001
4002 static const char degrade_cc_to_c_warning[] =
4003 "only found copies from modified paths due to too many files.";
4004
4005 static const char rename_limit_advice[] =
4006 "you may want to set your %s variable to at least "
4007 "%d and retry the command.";
4008
4009 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc)
4010 {
4011 if (degraded_cc)
4012 warning(degrade_cc_to_c_warning);
4013 else if (needed)
4014 warning(rename_limit_warning);
4015 else
4016 return;
4017 if (0 < needed && needed < 32767)
4018 warning(rename_limit_advice, varname, needed);
4019 }
4020
4021 void diff_flush(struct diff_options *options)
4022 {
4023 struct diff_queue_struct *q = &diff_queued_diff;
4024 int i, output_format = options->output_format;
4025 int separator = 0;
4026
4027 /*
4028 * Order: raw, stat, summary, patch
4029 * or: name/name-status/checkdiff (other bits clear)
4030 */
4031 if (!q->nr)
4032 goto free_queue;
4033
4034 if (output_format & (DIFF_FORMAT_RAW |
4035 DIFF_FORMAT_NAME |
4036 DIFF_FORMAT_NAME_STATUS |
4037 DIFF_FORMAT_CHECKDIFF)) {
4038 for (i = 0; i < q->nr; i++) {
4039 struct diff_filepair *p = q->queue[i];
4040 if (check_pair_status(p))
4041 flush_one_pair(p, options);
4042 }
4043 separator++;
4044 }
4045
4046 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
4047 struct diffstat_t diffstat;
4048
4049 memset(&diffstat, 0, sizeof(struct diffstat_t));
4050 for (i = 0; i < q->nr; i++) {
4051 struct diff_filepair *p = q->queue[i];
4052 if (check_pair_status(p))
4053 diff_flush_stat(p, options, &diffstat);
4054 }
4055 if (output_format & DIFF_FORMAT_NUMSTAT)
4056 show_numstat(&diffstat, options);
4057 if (output_format & DIFF_FORMAT_DIFFSTAT)
4058 show_stats(&diffstat, options);
4059 if (output_format & DIFF_FORMAT_SHORTSTAT)
4060 show_shortstats(&diffstat, options);
4061 free_diffstat_info(&diffstat);
4062 separator++;
4063 }
4064 if (output_format & DIFF_FORMAT_DIRSTAT)
4065 show_dirstat(options);
4066
4067 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
4068 for (i = 0; i < q->nr; i++) {
4069 diff_summary(options, q->queue[i]);
4070 }
4071 separator++;
4072 }
4073
4074 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
4075 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
4076 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4077 /*
4078 * run diff_flush_patch for the exit status. setting
4079 * options->file to /dev/null should be safe, becaue we
4080 * aren't supposed to produce any output anyway.
4081 */
4082 if (options->close_file)
4083 fclose(options->file);
4084 options->file = fopen("/dev/null", "w");
4085 if (!options->file)
4086 die_errno("Could not open /dev/null");
4087 options->close_file = 1;
4088 for (i = 0; i < q->nr; i++) {
4089 struct diff_filepair *p = q->queue[i];
4090 if (check_pair_status(p))
4091 diff_flush_patch(p, options);
4092 if (options->found_changes)
4093 break;
4094 }
4095 }
4096
4097 if (output_format & DIFF_FORMAT_PATCH) {
4098 if (separator) {
4099 putc(options->line_termination, options->file);
4100 if (options->stat_sep) {
4101 /* attach patch instead of inline */
4102 fputs(options->stat_sep, options->file);
4103 }
4104 }
4105
4106 for (i = 0; i < q->nr; i++) {
4107 struct diff_filepair *p = q->queue[i];
4108 if (check_pair_status(p))
4109 diff_flush_patch(p, options);
4110 }
4111 }
4112
4113 if (output_format & DIFF_FORMAT_CALLBACK)
4114 options->format_callback(q, options, options->format_callback_data);
4115
4116 for (i = 0; i < q->nr; i++)
4117 diff_free_filepair(q->queue[i]);
4118 free_queue:
4119 free(q->queue);
4120 DIFF_QUEUE_CLEAR(q);
4121 if (options->close_file)
4122 fclose(options->file);
4123
4124 /*
4125 * Report the content-level differences with HAS_CHANGES;
4126 * diff_addremove/diff_change does not set the bit when
4127 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
4128 */
4129 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
4130 if (options->found_changes)
4131 DIFF_OPT_SET(options, HAS_CHANGES);
4132 else
4133 DIFF_OPT_CLR(options, HAS_CHANGES);
4134 }
4135 }
4136
4137 static void diffcore_apply_filter(const char *filter)
4138 {
4139 int i;
4140 struct diff_queue_struct *q = &diff_queued_diff;
4141 struct diff_queue_struct outq;
4142 DIFF_QUEUE_CLEAR(&outq);
4143
4144 if (!filter)
4145 return;
4146
4147 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
4148 int found;
4149 for (i = found = 0; !found && i < q->nr; i++) {
4150 struct diff_filepair *p = q->queue[i];
4151 if (((p->status == DIFF_STATUS_MODIFIED) &&
4152 ((p->score &&
4153 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4154 (!p->score &&
4155 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4156 ((p->status != DIFF_STATUS_MODIFIED) &&
4157 strchr(filter, p->status)))
4158 found++;
4159 }
4160 if (found)
4161 return;
4162
4163 /* otherwise we will clear the whole queue
4164 * by copying the empty outq at the end of this
4165 * function, but first clear the current entries
4166 * in the queue.
4167 */
4168 for (i = 0; i < q->nr; i++)
4169 diff_free_filepair(q->queue[i]);
4170 }
4171 else {
4172 /* Only the matching ones */
4173 for (i = 0; i < q->nr; i++) {
4174 struct diff_filepair *p = q->queue[i];
4175
4176 if (((p->status == DIFF_STATUS_MODIFIED) &&
4177 ((p->score &&
4178 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
4179 (!p->score &&
4180 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
4181 ((p->status != DIFF_STATUS_MODIFIED) &&
4182 strchr(filter, p->status)))
4183 diff_q(&outq, p);
4184 else
4185 diff_free_filepair(p);
4186 }
4187 }
4188 free(q->queue);
4189 *q = outq;
4190 }
4191
4192 /* Check whether two filespecs with the same mode and size are identical */
4193 static int diff_filespec_is_identical(struct diff_filespec *one,
4194 struct diff_filespec *two)
4195 {
4196 if (S_ISGITLINK(one->mode))
4197 return 0;
4198 if (diff_populate_filespec(one, 0))
4199 return 0;
4200 if (diff_populate_filespec(two, 0))
4201 return 0;
4202 return !memcmp(one->data, two->data, one->size);
4203 }
4204
4205 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4206 {
4207 int i;
4208 struct diff_queue_struct *q = &diff_queued_diff;
4209 struct diff_queue_struct outq;
4210 DIFF_QUEUE_CLEAR(&outq);
4211
4212 for (i = 0; i < q->nr; i++) {
4213 struct diff_filepair *p = q->queue[i];
4214
4215 /*
4216 * 1. Entries that come from stat info dirtiness
4217 * always have both sides (iow, not create/delete),
4218 * one side of the object name is unknown, with
4219 * the same mode and size. Keep the ones that
4220 * do not match these criteria. They have real
4221 * differences.
4222 *
4223 * 2. At this point, the file is known to be modified,
4224 * with the same mode and size, and the object
4225 * name of one side is unknown. Need to inspect
4226 * the identical contents.
4227 */
4228 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4229 !DIFF_FILE_VALID(p->two) ||
4230 (p->one->sha1_valid && p->two->sha1_valid) ||
4231 (p->one->mode != p->two->mode) ||
4232 diff_populate_filespec(p->one, 1) ||
4233 diff_populate_filespec(p->two, 1) ||
4234 (p->one->size != p->two->size) ||
4235 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4236 diff_q(&outq, p);
4237 else {
4238 /*
4239 * The caller can subtract 1 from skip_stat_unmatch
4240 * to determine how many paths were dirty only
4241 * due to stat info mismatch.
4242 */
4243 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4244 diffopt->skip_stat_unmatch++;
4245 diff_free_filepair(p);
4246 }
4247 }
4248 free(q->queue);
4249 *q = outq;
4250 }
4251
4252 static int diffnamecmp(const void *a_, const void *b_)
4253 {
4254 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4255 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4256 const char *name_a, *name_b;
4257
4258 name_a = a->one ? a->one->path : a->two->path;
4259 name_b = b->one ? b->one->path : b->two->path;
4260 return strcmp(name_a, name_b);
4261 }
4262
4263 void diffcore_fix_diff_index(struct diff_options *options)
4264 {
4265 struct diff_queue_struct *q = &diff_queued_diff;
4266 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4267 }
4268
4269 void diffcore_std(struct diff_options *options)
4270 {
4271 if (options->skip_stat_unmatch)
4272 diffcore_skip_stat_unmatch(options);
4273 if (!options->found_follow) {
4274 /* See try_to_follow_renames() in tree-diff.c */
4275 if (options->break_opt != -1)
4276 diffcore_break(options->break_opt);
4277 if (options->detect_rename)
4278 diffcore_rename(options);
4279 if (options->break_opt != -1)
4280 diffcore_merge_broken();
4281 }
4282 if (options->pickaxe)
4283 diffcore_pickaxe(options);
4284 if (options->orderfile)
4285 diffcore_order(options->orderfile);
4286 if (!options->found_follow)
4287 /* See try_to_follow_renames() in tree-diff.c */
4288 diff_resolve_rename_copy();
4289 diffcore_apply_filter(options->filter);
4290
4291 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4292 DIFF_OPT_SET(options, HAS_CHANGES);
4293 else
4294 DIFF_OPT_CLR(options, HAS_CHANGES);
4295
4296 options->found_follow = 0;
4297 }
4298
4299 int diff_result_code(struct diff_options *opt, int status)
4300 {
4301 int result = 0;
4302
4303 diff_warn_rename_limit("diff.renamelimit",
4304 opt->needed_rename_limit,
4305 opt->degraded_cc_to_c);
4306 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4307 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4308 return status;
4309 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4310 DIFF_OPT_TST(opt, HAS_CHANGES))
4311 result |= 01;
4312 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4313 DIFF_OPT_TST(opt, CHECK_FAILED))
4314 result |= 02;
4315 return result;
4316 }
4317
4318 /*
4319 * Shall changes to this submodule be ignored?
4320 *
4321 * Submodule changes can be configured to be ignored separately for each path,
4322 * but that configuration can be overridden from the command line.
4323 */
4324 static int is_submodule_ignored(const char *path, struct diff_options *options)
4325 {
4326 int ignored = 0;
4327 unsigned orig_flags = options->flags;
4328 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4329 set_diffopt_flags_from_submodule_config(options, path);
4330 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4331 ignored = 1;
4332 options->flags = orig_flags;
4333 return ignored;
4334 }
4335
4336 void diff_addremove(struct diff_options *options,
4337 int addremove, unsigned mode,
4338 const unsigned char *sha1,
4339 const char *concatpath, unsigned dirty_submodule)
4340 {
4341 struct diff_filespec *one, *two;
4342
4343 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4344 return;
4345
4346 /* This may look odd, but it is a preparation for
4347 * feeding "there are unchanged files which should
4348 * not produce diffs, but when you are doing copy
4349 * detection you would need them, so here they are"
4350 * entries to the diff-core. They will be prefixed
4351 * with something like '=' or '*' (I haven't decided
4352 * which but should not make any difference).
4353 * Feeding the same new and old to diff_change()
4354 * also has the same effect.
4355 * Before the final output happens, they are pruned after
4356 * merged into rename/copy pairs as appropriate.
4357 */
4358 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4359 addremove = (addremove == '+' ? '-' :
4360 addremove == '-' ? '+' : addremove);
4361
4362 if (options->prefix &&
4363 strncmp(concatpath, options->prefix, options->prefix_length))
4364 return;
4365
4366 one = alloc_filespec(concatpath);
4367 two = alloc_filespec(concatpath);
4368
4369 if (addremove != '+')
4370 fill_filespec(one, sha1, mode);
4371 if (addremove != '-') {
4372 fill_filespec(two, sha1, mode);
4373 two->dirty_submodule = dirty_submodule;
4374 }
4375
4376 diff_queue(&diff_queued_diff, one, two);
4377 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4378 DIFF_OPT_SET(options, HAS_CHANGES);
4379 }
4380
4381 void diff_change(struct diff_options *options,
4382 unsigned old_mode, unsigned new_mode,
4383 const unsigned char *old_sha1,
4384 const unsigned char *new_sha1,
4385 const char *concatpath,
4386 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4387 {
4388 struct diff_filespec *one, *two;
4389
4390 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4391 is_submodule_ignored(concatpath, options))
4392 return;
4393
4394 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4395 unsigned tmp;
4396 const unsigned char *tmp_c;
4397 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4398 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4399 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4400 new_dirty_submodule = tmp;
4401 }
4402
4403 if (options->prefix &&
4404 strncmp(concatpath, options->prefix, options->prefix_length))
4405 return;
4406
4407 one = alloc_filespec(concatpath);
4408 two = alloc_filespec(concatpath);
4409 fill_filespec(one, old_sha1, old_mode);
4410 fill_filespec(two, new_sha1, new_mode);
4411 one->dirty_submodule = old_dirty_submodule;
4412 two->dirty_submodule = new_dirty_submodule;
4413
4414 diff_queue(&diff_queued_diff, one, two);
4415 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4416 DIFF_OPT_SET(options, HAS_CHANGES);
4417 }
4418
4419 void diff_unmerge(struct diff_options *options,
4420 const char *path,
4421 unsigned mode, const unsigned char *sha1)
4422 {
4423 struct diff_filespec *one, *two;
4424
4425 if (options->prefix &&
4426 strncmp(path, options->prefix, options->prefix_length))
4427 return;
4428
4429 one = alloc_filespec(path);
4430 two = alloc_filespec(path);
4431 fill_filespec(one, sha1, mode);
4432 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
4433 }
4434
4435 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4436 size_t *outsize)
4437 {
4438 struct diff_tempfile *temp;
4439 const char *argv[3];
4440 const char **arg = argv;
4441 struct child_process child;
4442 struct strbuf buf = STRBUF_INIT;
4443 int err = 0;
4444
4445 temp = prepare_temp_file(spec->path, spec);
4446 *arg++ = pgm;
4447 *arg++ = temp->name;
4448 *arg = NULL;
4449
4450 memset(&child, 0, sizeof(child));
4451 child.use_shell = 1;
4452 child.argv = argv;
4453 child.out = -1;
4454 if (start_command(&child)) {
4455 remove_tempfile();
4456 return NULL;
4457 }
4458
4459 if (strbuf_read(&buf, child.out, 0) < 0)
4460 err = error("error reading from textconv command '%s'", pgm);
4461 close(child.out);
4462
4463 if (finish_command(&child) || err) {
4464 strbuf_release(&buf);
4465 remove_tempfile();
4466 return NULL;
4467 }
4468 remove_tempfile();
4469
4470 return strbuf_detach(&buf, outsize);
4471 }
4472
4473 size_t fill_textconv(struct userdiff_driver *driver,
4474 struct diff_filespec *df,
4475 char **outbuf)
4476 {
4477 size_t size;
4478
4479 if (!driver || !driver->textconv) {
4480 if (!DIFF_FILE_VALID(df)) {
4481 *outbuf = "";
4482 return 0;
4483 }
4484 if (diff_populate_filespec(df, 0))
4485 die("unable to read files to diff");
4486 *outbuf = df->data;
4487 return df->size;
4488 }
4489
4490 if (driver->textconv_cache && df->sha1_valid) {
4491 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4492 &size);
4493 if (*outbuf)
4494 return size;
4495 }
4496
4497 *outbuf = run_textconv(driver->textconv, df, &size);
4498 if (!*outbuf)
4499 die("unable to read files to diff");
4500
4501 if (driver->textconv_cache && df->sha1_valid) {
4502 /* ignore errors, as we might be in a readonly repository */
4503 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4504 size);
4505 /*
4506 * we could save up changes and flush them all at the end,
4507 * but we would need an extra call after all diffing is done.
4508 * Since generating a cache entry is the slow path anyway,
4509 * this extra overhead probably isn't a big deal.
4510 */
4511 notes_cache_write(driver->textconv_cache);
4512 }
4513
4514 return size;
4515 }