Submodules: Add the new "ignore" config option for diff and status
[git/git.git] / diff.c
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 200;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34
35 static char diff_colors[][COLOR_MAXLEN] = {
36 GIT_COLOR_RESET,
37 GIT_COLOR_NORMAL, /* PLAIN */
38 GIT_COLOR_BOLD, /* METAINFO */
39 GIT_COLOR_CYAN, /* FRAGINFO */
40 GIT_COLOR_RED, /* OLD */
41 GIT_COLOR_GREEN, /* NEW */
42 GIT_COLOR_YELLOW, /* COMMIT */
43 GIT_COLOR_BG_RED, /* WHITESPACE */
44 GIT_COLOR_NORMAL, /* FUNCINFO */
45 };
46
47 static int parse_diff_color_slot(const char *var, int ofs)
48 {
49 if (!strcasecmp(var+ofs, "plain"))
50 return DIFF_PLAIN;
51 if (!strcasecmp(var+ofs, "meta"))
52 return DIFF_METAINFO;
53 if (!strcasecmp(var+ofs, "frag"))
54 return DIFF_FRAGINFO;
55 if (!strcasecmp(var+ofs, "old"))
56 return DIFF_FILE_OLD;
57 if (!strcasecmp(var+ofs, "new"))
58 return DIFF_FILE_NEW;
59 if (!strcasecmp(var+ofs, "commit"))
60 return DIFF_COMMIT;
61 if (!strcasecmp(var+ofs, "whitespace"))
62 return DIFF_WHITESPACE;
63 if (!strcasecmp(var+ofs, "func"))
64 return DIFF_FUNCINFO;
65 return -1;
66 }
67
68 static int git_config_rename(const char *var, const char *value)
69 {
70 if (!value)
71 return DIFF_DETECT_RENAME;
72 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
73 return DIFF_DETECT_COPY;
74 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
75 }
76
77 /*
78 * These are to give UI layer defaults.
79 * The core-level commands such as git-diff-files should
80 * never be affected by the setting of diff.renames
81 * the user happens to have in the configuration file.
82 */
83 int git_diff_ui_config(const char *var, const char *value, void *cb)
84 {
85 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
86 diff_use_color_default = git_config_colorbool(var, value, -1);
87 return 0;
88 }
89 if (!strcmp(var, "diff.renames")) {
90 diff_detect_rename_default = git_config_rename(var, value);
91 return 0;
92 }
93 if (!strcmp(var, "diff.autorefreshindex")) {
94 diff_auto_refresh_index = git_config_bool(var, value);
95 return 0;
96 }
97 if (!strcmp(var, "diff.mnemonicprefix")) {
98 diff_mnemonic_prefix = git_config_bool(var, value);
99 return 0;
100 }
101 if (!strcmp(var, "diff.noprefix")) {
102 diff_no_prefix = git_config_bool(var, value);
103 return 0;
104 }
105 if (!strcmp(var, "diff.external"))
106 return git_config_string(&external_diff_cmd_cfg, var, value);
107 if (!strcmp(var, "diff.wordregex"))
108 return git_config_string(&diff_word_regex_cfg, var, value);
109
110 return git_diff_basic_config(var, value, cb);
111 }
112
113 int git_diff_basic_config(const char *var, const char *value, void *cb)
114 {
115 if (!strcmp(var, "diff.renamelimit")) {
116 diff_rename_limit_default = git_config_int(var, value);
117 return 0;
118 }
119
120 switch (userdiff_config(var, value)) {
121 case 0: break;
122 case -1: return -1;
123 default: return 0;
124 }
125
126 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
127 int slot = parse_diff_color_slot(var, 11);
128 if (slot < 0)
129 return 0;
130 if (!value)
131 return config_error_nonbool(var);
132 color_parse(value, var, diff_colors[slot]);
133 return 0;
134 }
135
136 /* like GNU diff's --suppress-blank-empty option */
137 if (!strcmp(var, "diff.suppressblankempty") ||
138 /* for backwards compatibility */
139 !strcmp(var, "diff.suppress-blank-empty")) {
140 diff_suppress_blank_empty = git_config_bool(var, value);
141 return 0;
142 }
143
144 if (!prefixcmp(var, "submodule."))
145 return parse_submodule_config_option(var, value);
146
147 return git_color_default_config(var, value, cb);
148 }
149
150 static char *quote_two(const char *one, const char *two)
151 {
152 int need_one = quote_c_style(one, NULL, NULL, 1);
153 int need_two = quote_c_style(two, NULL, NULL, 1);
154 struct strbuf res = STRBUF_INIT;
155
156 if (need_one + need_two) {
157 strbuf_addch(&res, '"');
158 quote_c_style(one, &res, NULL, 1);
159 quote_c_style(two, &res, NULL, 1);
160 strbuf_addch(&res, '"');
161 } else {
162 strbuf_addstr(&res, one);
163 strbuf_addstr(&res, two);
164 }
165 return strbuf_detach(&res, NULL);
166 }
167
168 static const char *external_diff(void)
169 {
170 static const char *external_diff_cmd = NULL;
171 static int done_preparing = 0;
172
173 if (done_preparing)
174 return external_diff_cmd;
175 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
176 if (!external_diff_cmd)
177 external_diff_cmd = external_diff_cmd_cfg;
178 done_preparing = 1;
179 return external_diff_cmd;
180 }
181
182 static struct diff_tempfile {
183 const char *name; /* filename external diff should read from */
184 char hex[41];
185 char mode[10];
186 char tmp_path[PATH_MAX];
187 } diff_temp[2];
188
189 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
190
191 struct emit_callback {
192 int color_diff;
193 unsigned ws_rule;
194 int blank_at_eof_in_preimage;
195 int blank_at_eof_in_postimage;
196 int lno_in_preimage;
197 int lno_in_postimage;
198 sane_truncate_fn truncate;
199 const char **label_path;
200 struct diff_words_data *diff_words;
201 struct diff_options *opt;
202 int *found_changesp;
203 struct strbuf *header;
204 };
205
206 static int count_lines(const char *data, int size)
207 {
208 int count, ch, completely_empty = 1, nl_just_seen = 0;
209 count = 0;
210 while (0 < size--) {
211 ch = *data++;
212 if (ch == '\n') {
213 count++;
214 nl_just_seen = 1;
215 completely_empty = 0;
216 }
217 else {
218 nl_just_seen = 0;
219 completely_empty = 0;
220 }
221 }
222 if (completely_empty)
223 return 0;
224 if (!nl_just_seen)
225 count++; /* no trailing newline */
226 return count;
227 }
228
229 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
230 {
231 if (!DIFF_FILE_VALID(one)) {
232 mf->ptr = (char *)""; /* does not matter */
233 mf->size = 0;
234 return 0;
235 }
236 else if (diff_populate_filespec(one, 0))
237 return -1;
238
239 mf->ptr = one->data;
240 mf->size = one->size;
241 return 0;
242 }
243
244 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
245 {
246 char *ptr = mf->ptr;
247 long size = mf->size;
248 int cnt = 0;
249
250 if (!size)
251 return cnt;
252 ptr += size - 1; /* pointing at the very end */
253 if (*ptr != '\n')
254 ; /* incomplete line */
255 else
256 ptr--; /* skip the last LF */
257 while (mf->ptr < ptr) {
258 char *prev_eol;
259 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
260 if (*prev_eol == '\n')
261 break;
262 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
263 break;
264 cnt++;
265 ptr = prev_eol - 1;
266 }
267 return cnt;
268 }
269
270 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
271 struct emit_callback *ecbdata)
272 {
273 int l1, l2, at;
274 unsigned ws_rule = ecbdata->ws_rule;
275 l1 = count_trailing_blank(mf1, ws_rule);
276 l2 = count_trailing_blank(mf2, ws_rule);
277 if (l2 <= l1) {
278 ecbdata->blank_at_eof_in_preimage = 0;
279 ecbdata->blank_at_eof_in_postimage = 0;
280 return;
281 }
282 at = count_lines(mf1->ptr, mf1->size);
283 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
284
285 at = count_lines(mf2->ptr, mf2->size);
286 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
287 }
288
289 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
290 int first, const char *line, int len)
291 {
292 int has_trailing_newline, has_trailing_carriage_return;
293 int nofirst;
294 FILE *file = o->file;
295
296 if (o->output_prefix) {
297 struct strbuf *msg = NULL;
298 msg = o->output_prefix(o, o->output_prefix_data);
299 assert(msg);
300 fwrite(msg->buf, msg->len, 1, file);
301 }
302
303 if (len == 0) {
304 has_trailing_newline = (first == '\n');
305 has_trailing_carriage_return = (!has_trailing_newline &&
306 (first == '\r'));
307 nofirst = has_trailing_newline || has_trailing_carriage_return;
308 } else {
309 has_trailing_newline = (len > 0 && line[len-1] == '\n');
310 if (has_trailing_newline)
311 len--;
312 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
313 if (has_trailing_carriage_return)
314 len--;
315 nofirst = 0;
316 }
317
318 if (len || !nofirst) {
319 fputs(set, file);
320 if (!nofirst)
321 fputc(first, file);
322 fwrite(line, len, 1, file);
323 fputs(reset, file);
324 }
325 if (has_trailing_carriage_return)
326 fputc('\r', file);
327 if (has_trailing_newline)
328 fputc('\n', file);
329 }
330
331 static void emit_line(struct diff_options *o, const char *set, const char *reset,
332 const char *line, int len)
333 {
334 emit_line_0(o, set, reset, line[0], line+1, len-1);
335 }
336
337 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
338 {
339 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
340 ecbdata->blank_at_eof_in_preimage &&
341 ecbdata->blank_at_eof_in_postimage &&
342 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
343 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
344 return 0;
345 return ws_blank_line(line, len, ecbdata->ws_rule);
346 }
347
348 static void emit_add_line(const char *reset,
349 struct emit_callback *ecbdata,
350 const char *line, int len)
351 {
352 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
353 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
354
355 if (!*ws)
356 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
357 else if (new_blank_line_at_eof(ecbdata, line, len))
358 /* Blank line at EOF - paint '+' as well */
359 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
360 else {
361 /* Emit just the prefix, then the rest. */
362 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
363 ws_check_emit(line, len, ecbdata->ws_rule,
364 ecbdata->opt->file, set, reset, ws);
365 }
366 }
367
368 static void emit_hunk_header(struct emit_callback *ecbdata,
369 const char *line, int len)
370 {
371 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
372 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
373 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
374 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
375 static const char atat[2] = { '@', '@' };
376 const char *cp, *ep;
377 struct strbuf msgbuf = STRBUF_INIT;
378 int org_len = len;
379 int i = 1;
380
381 /*
382 * As a hunk header must begin with "@@ -<old>, +<new> @@",
383 * it always is at least 10 bytes long.
384 */
385 if (len < 10 ||
386 memcmp(line, atat, 2) ||
387 !(ep = memmem(line + 2, len - 2, atat, 2))) {
388 emit_line(ecbdata->opt, plain, reset, line, len);
389 return;
390 }
391 ep += 2; /* skip over @@ */
392
393 /* The hunk header in fraginfo color */
394 strbuf_add(&msgbuf, frag, strlen(frag));
395 strbuf_add(&msgbuf, line, ep - line);
396 strbuf_add(&msgbuf, reset, strlen(reset));
397
398 /*
399 * trailing "\r\n"
400 */
401 for ( ; i < 3; i++)
402 if (line[len - i] == '\r' || line[len - i] == '\n')
403 len--;
404
405 /* blank before the func header */
406 for (cp = ep; ep - line < len; ep++)
407 if (*ep != ' ' && *ep != '\t')
408 break;
409 if (ep != cp) {
410 strbuf_add(&msgbuf, plain, strlen(plain));
411 strbuf_add(&msgbuf, cp, ep - cp);
412 strbuf_add(&msgbuf, reset, strlen(reset));
413 }
414
415 if (ep < line + len) {
416 strbuf_add(&msgbuf, func, strlen(func));
417 strbuf_add(&msgbuf, ep, line + len - ep);
418 strbuf_add(&msgbuf, reset, strlen(reset));
419 }
420
421 strbuf_add(&msgbuf, line + len, org_len - len);
422 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
423 strbuf_release(&msgbuf);
424 }
425
426 static struct diff_tempfile *claim_diff_tempfile(void) {
427 int i;
428 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
429 if (!diff_temp[i].name)
430 return diff_temp + i;
431 die("BUG: diff is failing to clean up its tempfiles");
432 }
433
434 static int remove_tempfile_installed;
435
436 static void remove_tempfile(void)
437 {
438 int i;
439 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
440 if (diff_temp[i].name == diff_temp[i].tmp_path)
441 unlink_or_warn(diff_temp[i].name);
442 diff_temp[i].name = NULL;
443 }
444 }
445
446 static void remove_tempfile_on_signal(int signo)
447 {
448 remove_tempfile();
449 sigchain_pop(signo);
450 raise(signo);
451 }
452
453 static void print_line_count(FILE *file, int count)
454 {
455 switch (count) {
456 case 0:
457 fprintf(file, "0,0");
458 break;
459 case 1:
460 fprintf(file, "1");
461 break;
462 default:
463 fprintf(file, "1,%d", count);
464 break;
465 }
466 }
467
468 static void emit_rewrite_lines(struct emit_callback *ecb,
469 int prefix, const char *data, int size)
470 {
471 const char *endp = NULL;
472 static const char *nneof = " No newline at end of file\n";
473 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
474 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
475
476 while (0 < size) {
477 int len;
478
479 endp = memchr(data, '\n', size);
480 len = endp ? (endp - data + 1) : size;
481 if (prefix != '+') {
482 ecb->lno_in_preimage++;
483 emit_line_0(ecb->opt, old, reset, '-',
484 data, len);
485 } else {
486 ecb->lno_in_postimage++;
487 emit_add_line(reset, ecb, data, len);
488 }
489 size -= len;
490 data += len;
491 }
492 if (!endp) {
493 const char *plain = diff_get_color(ecb->color_diff,
494 DIFF_PLAIN);
495 emit_line_0(ecb->opt, plain, reset, '\\',
496 nneof, strlen(nneof));
497 }
498 }
499
500 static void emit_rewrite_diff(const char *name_a,
501 const char *name_b,
502 struct diff_filespec *one,
503 struct diff_filespec *two,
504 struct userdiff_driver *textconv_one,
505 struct userdiff_driver *textconv_two,
506 struct diff_options *o)
507 {
508 int lc_a, lc_b;
509 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
510 const char *name_a_tab, *name_b_tab;
511 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
512 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
513 const char *reset = diff_get_color(color_diff, DIFF_RESET);
514 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
515 const char *a_prefix, *b_prefix;
516 char *data_one, *data_two;
517 size_t size_one, size_two;
518 struct emit_callback ecbdata;
519 char *line_prefix = "";
520 struct strbuf *msgbuf;
521
522 if (o && o->output_prefix) {
523 msgbuf = o->output_prefix(o, o->output_prefix_data);
524 line_prefix = msgbuf->buf;
525 }
526
527 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
528 a_prefix = o->b_prefix;
529 b_prefix = o->a_prefix;
530 } else {
531 a_prefix = o->a_prefix;
532 b_prefix = o->b_prefix;
533 }
534
535 name_a += (*name_a == '/');
536 name_b += (*name_b == '/');
537 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
538 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
539
540 strbuf_reset(&a_name);
541 strbuf_reset(&b_name);
542 quote_two_c_style(&a_name, a_prefix, name_a, 0);
543 quote_two_c_style(&b_name, b_prefix, name_b, 0);
544
545 size_one = fill_textconv(textconv_one, one, &data_one);
546 size_two = fill_textconv(textconv_two, two, &data_two);
547
548 memset(&ecbdata, 0, sizeof(ecbdata));
549 ecbdata.color_diff = color_diff;
550 ecbdata.found_changesp = &o->found_changes;
551 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
552 ecbdata.opt = o;
553 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
554 mmfile_t mf1, mf2;
555 mf1.ptr = (char *)data_one;
556 mf2.ptr = (char *)data_two;
557 mf1.size = size_one;
558 mf2.size = size_two;
559 check_blank_at_eof(&mf1, &mf2, &ecbdata);
560 }
561 ecbdata.lno_in_preimage = 1;
562 ecbdata.lno_in_postimage = 1;
563
564 lc_a = count_lines(data_one, size_one);
565 lc_b = count_lines(data_two, size_two);
566 fprintf(o->file,
567 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
568 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
569 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
570 line_prefix, fraginfo);
571 print_line_count(o->file, lc_a);
572 fprintf(o->file, " +");
573 print_line_count(o->file, lc_b);
574 fprintf(o->file, " @@%s\n", reset);
575 if (lc_a)
576 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
577 if (lc_b)
578 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
579 if (textconv_one)
580 free((char *)data_one);
581 if (textconv_two)
582 free((char *)data_two);
583 }
584
585 struct diff_words_buffer {
586 mmfile_t text;
587 long alloc;
588 struct diff_words_orig {
589 const char *begin, *end;
590 } *orig;
591 int orig_nr, orig_alloc;
592 };
593
594 static void diff_words_append(char *line, unsigned long len,
595 struct diff_words_buffer *buffer)
596 {
597 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
598 line++;
599 len--;
600 memcpy(buffer->text.ptr + buffer->text.size, line, len);
601 buffer->text.size += len;
602 buffer->text.ptr[buffer->text.size] = '\0';
603 }
604
605 struct diff_words_style_elem
606 {
607 const char *prefix;
608 const char *suffix;
609 const char *color; /* NULL; filled in by the setup code if
610 * color is enabled */
611 };
612
613 struct diff_words_style
614 {
615 enum diff_words_type type;
616 struct diff_words_style_elem new, old, ctx;
617 const char *newline;
618 };
619
620 struct diff_words_style diff_words_styles[] = {
621 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
622 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
623 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
624 };
625
626 struct diff_words_data {
627 struct diff_words_buffer minus, plus;
628 const char *current_plus;
629 int last_minus;
630 struct diff_options *opt;
631 regex_t *word_regex;
632 enum diff_words_type type;
633 struct diff_words_style *style;
634 };
635
636 static int fn_out_diff_words_write_helper(FILE *fp,
637 struct diff_words_style_elem *st_el,
638 const char *newline,
639 size_t count, const char *buf,
640 const char *line_prefix)
641 {
642 int print = 0;
643
644 while (count) {
645 char *p = memchr(buf, '\n', count);
646 if (print)
647 fputs(line_prefix, fp);
648 if (p != buf) {
649 if (st_el->color && fputs(st_el->color, fp) < 0)
650 return -1;
651 if (fputs(st_el->prefix, fp) < 0 ||
652 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
653 fputs(st_el->suffix, fp) < 0)
654 return -1;
655 if (st_el->color && *st_el->color
656 && fputs(GIT_COLOR_RESET, fp) < 0)
657 return -1;
658 }
659 if (!p)
660 return 0;
661 if (fputs(newline, fp) < 0)
662 return -1;
663 count -= p + 1 - buf;
664 buf = p + 1;
665 print = 1;
666 }
667 return 0;
668 }
669
670 /*
671 * '--color-words' algorithm can be described as:
672 *
673 * 1. collect a the minus/plus lines of a diff hunk, divided into
674 * minus-lines and plus-lines;
675 *
676 * 2. break both minus-lines and plus-lines into words and
677 * place them into two mmfile_t with one word for each line;
678 *
679 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
680 *
681 * And for the common parts of the both file, we output the plus side text.
682 * diff_words->current_plus is used to trace the current position of the plus file
683 * which printed. diff_words->last_minus is used to trace the last minus word
684 * printed.
685 *
686 * For '--graph' to work with '--color-words', we need to output the graph prefix
687 * on each line of color words output. Generally, there are two conditions on
688 * which we should output the prefix.
689 *
690 * 1. diff_words->last_minus == 0 &&
691 * diff_words->current_plus == diff_words->plus.text.ptr
692 *
693 * that is: the plus text must start as a new line, and if there is no minus
694 * word printed, a graph prefix must be printed.
695 *
696 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
697 * *(diff_words->current_plus - 1) == '\n'
698 *
699 * that is: a graph prefix must be printed following a '\n'
700 */
701 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
702 {
703 if ((diff_words->last_minus == 0 &&
704 diff_words->current_plus == diff_words->plus.text.ptr) ||
705 (diff_words->current_plus > diff_words->plus.text.ptr &&
706 *(diff_words->current_plus - 1) == '\n')) {
707 return 1;
708 } else {
709 return 0;
710 }
711 }
712
713 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
714 {
715 struct diff_words_data *diff_words = priv;
716 struct diff_words_style *style = diff_words->style;
717 int minus_first, minus_len, plus_first, plus_len;
718 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
719 struct diff_options *opt = diff_words->opt;
720 struct strbuf *msgbuf;
721 char *line_prefix = "";
722
723 if (line[0] != '@' || parse_hunk_header(line, len,
724 &minus_first, &minus_len, &plus_first, &plus_len))
725 return;
726
727 assert(opt);
728 if (opt->output_prefix) {
729 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
730 line_prefix = msgbuf->buf;
731 }
732
733 /* POSIX requires that first be decremented by one if len == 0... */
734 if (minus_len) {
735 minus_begin = diff_words->minus.orig[minus_first].begin;
736 minus_end =
737 diff_words->minus.orig[minus_first + minus_len - 1].end;
738 } else
739 minus_begin = minus_end =
740 diff_words->minus.orig[minus_first].end;
741
742 if (plus_len) {
743 plus_begin = diff_words->plus.orig[plus_first].begin;
744 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
745 } else
746 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
747
748 if (color_words_output_graph_prefix(diff_words)) {
749 fputs(line_prefix, diff_words->opt->file);
750 }
751 if (diff_words->current_plus != plus_begin) {
752 fn_out_diff_words_write_helper(diff_words->opt->file,
753 &style->ctx, style->newline,
754 plus_begin - diff_words->current_plus,
755 diff_words->current_plus, line_prefix);
756 if (*(plus_begin - 1) == '\n')
757 fputs(line_prefix, diff_words->opt->file);
758 }
759 if (minus_begin != minus_end) {
760 fn_out_diff_words_write_helper(diff_words->opt->file,
761 &style->old, style->newline,
762 minus_end - minus_begin, minus_begin,
763 line_prefix);
764 }
765 if (plus_begin != plus_end) {
766 fn_out_diff_words_write_helper(diff_words->opt->file,
767 &style->new, style->newline,
768 plus_end - plus_begin, plus_begin,
769 line_prefix);
770 }
771
772 diff_words->current_plus = plus_end;
773 diff_words->last_minus = minus_first;
774 }
775
776 /* This function starts looking at *begin, and returns 0 iff a word was found. */
777 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
778 int *begin, int *end)
779 {
780 if (word_regex && *begin < buffer->size) {
781 regmatch_t match[1];
782 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
783 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
784 '\n', match[0].rm_eo - match[0].rm_so);
785 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
786 *begin += match[0].rm_so;
787 return *begin >= *end;
788 }
789 return -1;
790 }
791
792 /* find the next word */
793 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
794 (*begin)++;
795 if (*begin >= buffer->size)
796 return -1;
797
798 /* find the end of the word */
799 *end = *begin + 1;
800 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
801 (*end)++;
802
803 return 0;
804 }
805
806 /*
807 * This function splits the words in buffer->text, stores the list with
808 * newline separator into out, and saves the offsets of the original words
809 * in buffer->orig.
810 */
811 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
812 regex_t *word_regex)
813 {
814 int i, j;
815 long alloc = 0;
816
817 out->size = 0;
818 out->ptr = NULL;
819
820 /* fake an empty "0th" word */
821 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
822 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
823 buffer->orig_nr = 1;
824
825 for (i = 0; i < buffer->text.size; i++) {
826 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
827 return;
828
829 /* store original boundaries */
830 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
831 buffer->orig_alloc);
832 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
833 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
834 buffer->orig_nr++;
835
836 /* store one word */
837 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
838 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
839 out->ptr[out->size + j - i] = '\n';
840 out->size += j - i + 1;
841
842 i = j - 1;
843 }
844 }
845
846 /* this executes the word diff on the accumulated buffers */
847 static void diff_words_show(struct diff_words_data *diff_words)
848 {
849 xpparam_t xpp;
850 xdemitconf_t xecfg;
851 mmfile_t minus, plus;
852 struct diff_words_style *style = diff_words->style;
853
854 struct diff_options *opt = diff_words->opt;
855 struct strbuf *msgbuf;
856 char *line_prefix = "";
857
858 assert(opt);
859 if (opt->output_prefix) {
860 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
861 line_prefix = msgbuf->buf;
862 }
863
864 /* special case: only removal */
865 if (!diff_words->plus.text.size) {
866 fputs(line_prefix, diff_words->opt->file);
867 fn_out_diff_words_write_helper(diff_words->opt->file,
868 &style->old, style->newline,
869 diff_words->minus.text.size,
870 diff_words->minus.text.ptr, line_prefix);
871 diff_words->minus.text.size = 0;
872 return;
873 }
874
875 diff_words->current_plus = diff_words->plus.text.ptr;
876 diff_words->last_minus = 0;
877
878 memset(&xpp, 0, sizeof(xpp));
879 memset(&xecfg, 0, sizeof(xecfg));
880 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
881 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
882 xpp.flags = 0;
883 /* as only the hunk header will be parsed, we need a 0-context */
884 xecfg.ctxlen = 0;
885 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
886 &xpp, &xecfg);
887 free(minus.ptr);
888 free(plus.ptr);
889 if (diff_words->current_plus != diff_words->plus.text.ptr +
890 diff_words->plus.text.size) {
891 if (color_words_output_graph_prefix(diff_words))
892 fputs(line_prefix, diff_words->opt->file);
893 fn_out_diff_words_write_helper(diff_words->opt->file,
894 &style->ctx, style->newline,
895 diff_words->plus.text.ptr + diff_words->plus.text.size
896 - diff_words->current_plus, diff_words->current_plus,
897 line_prefix);
898 }
899 diff_words->minus.text.size = diff_words->plus.text.size = 0;
900 }
901
902 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
903 static void diff_words_flush(struct emit_callback *ecbdata)
904 {
905 if (ecbdata->diff_words->minus.text.size ||
906 ecbdata->diff_words->plus.text.size)
907 diff_words_show(ecbdata->diff_words);
908 }
909
910 static void free_diff_words_data(struct emit_callback *ecbdata)
911 {
912 if (ecbdata->diff_words) {
913 diff_words_flush(ecbdata);
914 free (ecbdata->diff_words->minus.text.ptr);
915 free (ecbdata->diff_words->minus.orig);
916 free (ecbdata->diff_words->plus.text.ptr);
917 free (ecbdata->diff_words->plus.orig);
918 free(ecbdata->diff_words->word_regex);
919 free(ecbdata->diff_words);
920 ecbdata->diff_words = NULL;
921 }
922 }
923
924 const char *diff_get_color(int diff_use_color, enum color_diff ix)
925 {
926 if (diff_use_color)
927 return diff_colors[ix];
928 return "";
929 }
930
931 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
932 {
933 const char *cp;
934 unsigned long allot;
935 size_t l = len;
936
937 if (ecb->truncate)
938 return ecb->truncate(line, len);
939 cp = line;
940 allot = l;
941 while (0 < l) {
942 (void) utf8_width(&cp, &l);
943 if (!cp)
944 break; /* truncated in the middle? */
945 }
946 return allot - l;
947 }
948
949 static void find_lno(const char *line, struct emit_callback *ecbdata)
950 {
951 const char *p;
952 ecbdata->lno_in_preimage = 0;
953 ecbdata->lno_in_postimage = 0;
954 p = strchr(line, '-');
955 if (!p)
956 return; /* cannot happen */
957 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
958 p = strchr(p, '+');
959 if (!p)
960 return; /* cannot happen */
961 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
962 }
963
964 static void fn_out_consume(void *priv, char *line, unsigned long len)
965 {
966 struct emit_callback *ecbdata = priv;
967 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
968 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
969 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
970 struct diff_options *o = ecbdata->opt;
971 char *line_prefix = "";
972 struct strbuf *msgbuf;
973
974 if (o && o->output_prefix) {
975 msgbuf = o->output_prefix(o, o->output_prefix_data);
976 line_prefix = msgbuf->buf;
977 }
978
979 if (ecbdata->header) {
980 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
981 strbuf_reset(ecbdata->header);
982 ecbdata->header = NULL;
983 }
984 *(ecbdata->found_changesp) = 1;
985
986 if (ecbdata->label_path[0]) {
987 const char *name_a_tab, *name_b_tab;
988
989 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
990 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
991
992 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
993 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
994 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
995 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
996 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
997 }
998
999 if (diff_suppress_blank_empty
1000 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1001 line[0] = '\n';
1002 len = 1;
1003 }
1004
1005 if (line[0] == '@') {
1006 if (ecbdata->diff_words)
1007 diff_words_flush(ecbdata);
1008 len = sane_truncate_line(ecbdata, line, len);
1009 find_lno(line, ecbdata);
1010 emit_hunk_header(ecbdata, line, len);
1011 if (line[len-1] != '\n')
1012 putc('\n', ecbdata->opt->file);
1013 return;
1014 }
1015
1016 if (len < 1) {
1017 emit_line(ecbdata->opt, reset, reset, line, len);
1018 if (ecbdata->diff_words
1019 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1020 fputs("~\n", ecbdata->opt->file);
1021 return;
1022 }
1023
1024 if (ecbdata->diff_words) {
1025 if (line[0] == '-') {
1026 diff_words_append(line, len,
1027 &ecbdata->diff_words->minus);
1028 return;
1029 } else if (line[0] == '+') {
1030 diff_words_append(line, len,
1031 &ecbdata->diff_words->plus);
1032 return;
1033 }
1034 diff_words_flush(ecbdata);
1035 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1036 emit_line(ecbdata->opt, plain, reset, line, len);
1037 fputs("~\n", ecbdata->opt->file);
1038 } else {
1039 /* don't print the prefix character */
1040 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1041 }
1042 return;
1043 }
1044
1045 if (line[0] != '+') {
1046 const char *color =
1047 diff_get_color(ecbdata->color_diff,
1048 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1049 ecbdata->lno_in_preimage++;
1050 if (line[0] == ' ')
1051 ecbdata->lno_in_postimage++;
1052 emit_line(ecbdata->opt, color, reset, line, len);
1053 } else {
1054 ecbdata->lno_in_postimage++;
1055 emit_add_line(reset, ecbdata, line + 1, len - 1);
1056 }
1057 }
1058
1059 static char *pprint_rename(const char *a, const char *b)
1060 {
1061 const char *old = a;
1062 const char *new = b;
1063 struct strbuf name = STRBUF_INIT;
1064 int pfx_length, sfx_length;
1065 int len_a = strlen(a);
1066 int len_b = strlen(b);
1067 int a_midlen, b_midlen;
1068 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1069 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1070
1071 if (qlen_a || qlen_b) {
1072 quote_c_style(a, &name, NULL, 0);
1073 strbuf_addstr(&name, " => ");
1074 quote_c_style(b, &name, NULL, 0);
1075 return strbuf_detach(&name, NULL);
1076 }
1077
1078 /* Find common prefix */
1079 pfx_length = 0;
1080 while (*old && *new && *old == *new) {
1081 if (*old == '/')
1082 pfx_length = old - a + 1;
1083 old++;
1084 new++;
1085 }
1086
1087 /* Find common suffix */
1088 old = a + len_a;
1089 new = b + len_b;
1090 sfx_length = 0;
1091 while (a <= old && b <= new && *old == *new) {
1092 if (*old == '/')
1093 sfx_length = len_a - (old - a);
1094 old--;
1095 new--;
1096 }
1097
1098 /*
1099 * pfx{mid-a => mid-b}sfx
1100 * {pfx-a => pfx-b}sfx
1101 * pfx{sfx-a => sfx-b}
1102 * name-a => name-b
1103 */
1104 a_midlen = len_a - pfx_length - sfx_length;
1105 b_midlen = len_b - pfx_length - sfx_length;
1106 if (a_midlen < 0)
1107 a_midlen = 0;
1108 if (b_midlen < 0)
1109 b_midlen = 0;
1110
1111 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1112 if (pfx_length + sfx_length) {
1113 strbuf_add(&name, a, pfx_length);
1114 strbuf_addch(&name, '{');
1115 }
1116 strbuf_add(&name, a + pfx_length, a_midlen);
1117 strbuf_addstr(&name, " => ");
1118 strbuf_add(&name, b + pfx_length, b_midlen);
1119 if (pfx_length + sfx_length) {
1120 strbuf_addch(&name, '}');
1121 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1122 }
1123 return strbuf_detach(&name, NULL);
1124 }
1125
1126 struct diffstat_t {
1127 int nr;
1128 int alloc;
1129 struct diffstat_file {
1130 char *from_name;
1131 char *name;
1132 char *print_name;
1133 unsigned is_unmerged:1;
1134 unsigned is_binary:1;
1135 unsigned is_renamed:1;
1136 uintmax_t added, deleted;
1137 } **files;
1138 };
1139
1140 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1141 const char *name_a,
1142 const char *name_b)
1143 {
1144 struct diffstat_file *x;
1145 x = xcalloc(sizeof (*x), 1);
1146 if (diffstat->nr == diffstat->alloc) {
1147 diffstat->alloc = alloc_nr(diffstat->alloc);
1148 diffstat->files = xrealloc(diffstat->files,
1149 diffstat->alloc * sizeof(x));
1150 }
1151 diffstat->files[diffstat->nr++] = x;
1152 if (name_b) {
1153 x->from_name = xstrdup(name_a);
1154 x->name = xstrdup(name_b);
1155 x->is_renamed = 1;
1156 }
1157 else {
1158 x->from_name = NULL;
1159 x->name = xstrdup(name_a);
1160 }
1161 return x;
1162 }
1163
1164 static void diffstat_consume(void *priv, char *line, unsigned long len)
1165 {
1166 struct diffstat_t *diffstat = priv;
1167 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1168
1169 if (line[0] == '+')
1170 x->added++;
1171 else if (line[0] == '-')
1172 x->deleted++;
1173 }
1174
1175 const char mime_boundary_leader[] = "------------";
1176
1177 static int scale_linear(int it, int width, int max_change)
1178 {
1179 /*
1180 * make sure that at least one '-' is printed if there were deletions,
1181 * and likewise for '+'.
1182 */
1183 if (max_change < 2)
1184 return it;
1185 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1186 }
1187
1188 static void show_name(FILE *file,
1189 const char *prefix, const char *name, int len)
1190 {
1191 fprintf(file, " %s%-*s |", prefix, len, name);
1192 }
1193
1194 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1195 {
1196 if (cnt <= 0)
1197 return;
1198 fprintf(file, "%s", set);
1199 while (cnt--)
1200 putc(ch, file);
1201 fprintf(file, "%s", reset);
1202 }
1203
1204 static void fill_print_name(struct diffstat_file *file)
1205 {
1206 char *pname;
1207
1208 if (file->print_name)
1209 return;
1210
1211 if (!file->is_renamed) {
1212 struct strbuf buf = STRBUF_INIT;
1213 if (quote_c_style(file->name, &buf, NULL, 0)) {
1214 pname = strbuf_detach(&buf, NULL);
1215 } else {
1216 pname = file->name;
1217 strbuf_release(&buf);
1218 }
1219 } else {
1220 pname = pprint_rename(file->from_name, file->name);
1221 }
1222 file->print_name = pname;
1223 }
1224
1225 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1226 {
1227 int i, len, add, del, adds = 0, dels = 0;
1228 uintmax_t max_change = 0, max_len = 0;
1229 int total_files = data->nr;
1230 int width, name_width;
1231 const char *reset, *set, *add_c, *del_c;
1232 const char *line_prefix = "";
1233 struct strbuf *msg = NULL;
1234
1235 if (data->nr == 0)
1236 return;
1237
1238 if (options->output_prefix) {
1239 msg = options->output_prefix(options, options->output_prefix_data);
1240 line_prefix = msg->buf;
1241 }
1242
1243 width = options->stat_width ? options->stat_width : 80;
1244 name_width = options->stat_name_width ? options->stat_name_width : 50;
1245
1246 /* Sanity: give at least 5 columns to the graph,
1247 * but leave at least 10 columns for the name.
1248 */
1249 if (width < 25)
1250 width = 25;
1251 if (name_width < 10)
1252 name_width = 10;
1253 else if (width < name_width + 15)
1254 name_width = width - 15;
1255
1256 /* Find the longest filename and max number of changes */
1257 reset = diff_get_color_opt(options, DIFF_RESET);
1258 set = diff_get_color_opt(options, DIFF_PLAIN);
1259 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1260 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1261
1262 for (i = 0; i < data->nr; i++) {
1263 struct diffstat_file *file = data->files[i];
1264 uintmax_t change = file->added + file->deleted;
1265 fill_print_name(file);
1266 len = strlen(file->print_name);
1267 if (max_len < len)
1268 max_len = len;
1269
1270 if (file->is_binary || file->is_unmerged)
1271 continue;
1272 if (max_change < change)
1273 max_change = change;
1274 }
1275
1276 /* Compute the width of the graph part;
1277 * 10 is for one blank at the beginning of the line plus
1278 * " | count " between the name and the graph.
1279 *
1280 * From here on, name_width is the width of the name area,
1281 * and width is the width of the graph area.
1282 */
1283 name_width = (name_width < max_len) ? name_width : max_len;
1284 if (width < (name_width + 10) + max_change)
1285 width = width - (name_width + 10);
1286 else
1287 width = max_change;
1288
1289 for (i = 0; i < data->nr; i++) {
1290 const char *prefix = "";
1291 char *name = data->files[i]->print_name;
1292 uintmax_t added = data->files[i]->added;
1293 uintmax_t deleted = data->files[i]->deleted;
1294 int name_len;
1295
1296 /*
1297 * "scale" the filename
1298 */
1299 len = name_width;
1300 name_len = strlen(name);
1301 if (name_width < name_len) {
1302 char *slash;
1303 prefix = "...";
1304 len -= 3;
1305 name += name_len - len;
1306 slash = strchr(name, '/');
1307 if (slash)
1308 name = slash;
1309 }
1310
1311 if (data->files[i]->is_binary) {
1312 fprintf(options->file, "%s", line_prefix);
1313 show_name(options->file, prefix, name, len);
1314 fprintf(options->file, " Bin ");
1315 fprintf(options->file, "%s%"PRIuMAX"%s",
1316 del_c, deleted, reset);
1317 fprintf(options->file, " -> ");
1318 fprintf(options->file, "%s%"PRIuMAX"%s",
1319 add_c, added, reset);
1320 fprintf(options->file, " bytes");
1321 fprintf(options->file, "\n");
1322 continue;
1323 }
1324 else if (data->files[i]->is_unmerged) {
1325 fprintf(options->file, "%s", line_prefix);
1326 show_name(options->file, prefix, name, len);
1327 fprintf(options->file, " Unmerged\n");
1328 continue;
1329 }
1330 else if (!data->files[i]->is_renamed &&
1331 (added + deleted == 0)) {
1332 total_files--;
1333 continue;
1334 }
1335
1336 /*
1337 * scale the add/delete
1338 */
1339 add = added;
1340 del = deleted;
1341 adds += add;
1342 dels += del;
1343
1344 if (width <= max_change) {
1345 add = scale_linear(add, width, max_change);
1346 del = scale_linear(del, width, max_change);
1347 }
1348 fprintf(options->file, "%s", line_prefix);
1349 show_name(options->file, prefix, name, len);
1350 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1351 added + deleted ? " " : "");
1352 show_graph(options->file, '+', add, add_c, reset);
1353 show_graph(options->file, '-', del, del_c, reset);
1354 fprintf(options->file, "\n");
1355 }
1356 fprintf(options->file, "%s", line_prefix);
1357 fprintf(options->file,
1358 " %d files changed, %d insertions(+), %d deletions(-)\n",
1359 total_files, adds, dels);
1360 }
1361
1362 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1363 {
1364 int i, adds = 0, dels = 0, total_files = data->nr;
1365
1366 if (data->nr == 0)
1367 return;
1368
1369 for (i = 0; i < data->nr; i++) {
1370 if (!data->files[i]->is_binary &&
1371 !data->files[i]->is_unmerged) {
1372 int added = data->files[i]->added;
1373 int deleted= data->files[i]->deleted;
1374 if (!data->files[i]->is_renamed &&
1375 (added + deleted == 0)) {
1376 total_files--;
1377 } else {
1378 adds += added;
1379 dels += deleted;
1380 }
1381 }
1382 }
1383 if (options->output_prefix) {
1384 struct strbuf *msg = NULL;
1385 msg = options->output_prefix(options,
1386 options->output_prefix_data);
1387 fprintf(options->file, "%s", msg->buf);
1388 }
1389 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1390 total_files, adds, dels);
1391 }
1392
1393 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1394 {
1395 int i;
1396
1397 if (data->nr == 0)
1398 return;
1399
1400 for (i = 0; i < data->nr; i++) {
1401 struct diffstat_file *file = data->files[i];
1402
1403 if (options->output_prefix) {
1404 struct strbuf *msg = NULL;
1405 msg = options->output_prefix(options,
1406 options->output_prefix_data);
1407 fprintf(options->file, "%s", msg->buf);
1408 }
1409
1410 if (file->is_binary)
1411 fprintf(options->file, "-\t-\t");
1412 else
1413 fprintf(options->file,
1414 "%"PRIuMAX"\t%"PRIuMAX"\t",
1415 file->added, file->deleted);
1416 if (options->line_termination) {
1417 fill_print_name(file);
1418 if (!file->is_renamed)
1419 write_name_quoted(file->name, options->file,
1420 options->line_termination);
1421 else {
1422 fputs(file->print_name, options->file);
1423 putc(options->line_termination, options->file);
1424 }
1425 } else {
1426 if (file->is_renamed) {
1427 putc('\0', options->file);
1428 write_name_quoted(file->from_name, options->file, '\0');
1429 }
1430 write_name_quoted(file->name, options->file, '\0');
1431 }
1432 }
1433 }
1434
1435 struct dirstat_file {
1436 const char *name;
1437 unsigned long changed;
1438 };
1439
1440 struct dirstat_dir {
1441 struct dirstat_file *files;
1442 int alloc, nr, percent, cumulative;
1443 };
1444
1445 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1446 unsigned long changed, const char *base, int baselen)
1447 {
1448 unsigned long this_dir = 0;
1449 unsigned int sources = 0;
1450 const char *line_prefix = "";
1451 struct strbuf *msg = NULL;
1452
1453 if (opt->output_prefix) {
1454 msg = opt->output_prefix(opt, opt->output_prefix_data);
1455 line_prefix = msg->buf;
1456 }
1457
1458 while (dir->nr) {
1459 struct dirstat_file *f = dir->files;
1460 int namelen = strlen(f->name);
1461 unsigned long this;
1462 char *slash;
1463
1464 if (namelen < baselen)
1465 break;
1466 if (memcmp(f->name, base, baselen))
1467 break;
1468 slash = strchr(f->name + baselen, '/');
1469 if (slash) {
1470 int newbaselen = slash + 1 - f->name;
1471 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1472 sources++;
1473 } else {
1474 this = f->changed;
1475 dir->files++;
1476 dir->nr--;
1477 sources += 2;
1478 }
1479 this_dir += this;
1480 }
1481
1482 /*
1483 * We don't report dirstat's for
1484 * - the top level
1485 * - or cases where everything came from a single directory
1486 * under this directory (sources == 1).
1487 */
1488 if (baselen && sources != 1) {
1489 int permille = this_dir * 1000 / changed;
1490 if (permille) {
1491 int percent = permille / 10;
1492 if (percent >= dir->percent) {
1493 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1494 percent, permille % 10, baselen, base);
1495 if (!dir->cumulative)
1496 return 0;
1497 }
1498 }
1499 }
1500 return this_dir;
1501 }
1502
1503 static int dirstat_compare(const void *_a, const void *_b)
1504 {
1505 const struct dirstat_file *a = _a;
1506 const struct dirstat_file *b = _b;
1507 return strcmp(a->name, b->name);
1508 }
1509
1510 static void show_dirstat(struct diff_options *options)
1511 {
1512 int i;
1513 unsigned long changed;
1514 struct dirstat_dir dir;
1515 struct diff_queue_struct *q = &diff_queued_diff;
1516
1517 dir.files = NULL;
1518 dir.alloc = 0;
1519 dir.nr = 0;
1520 dir.percent = options->dirstat_percent;
1521 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1522
1523 changed = 0;
1524 for (i = 0; i < q->nr; i++) {
1525 struct diff_filepair *p = q->queue[i];
1526 const char *name;
1527 unsigned long copied, added, damage;
1528
1529 name = p->one->path ? p->one->path : p->two->path;
1530
1531 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1532 diff_populate_filespec(p->one, 0);
1533 diff_populate_filespec(p->two, 0);
1534 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1535 &copied, &added);
1536 diff_free_filespec_data(p->one);
1537 diff_free_filespec_data(p->two);
1538 } else if (DIFF_FILE_VALID(p->one)) {
1539 diff_populate_filespec(p->one, 1);
1540 copied = added = 0;
1541 diff_free_filespec_data(p->one);
1542 } else if (DIFF_FILE_VALID(p->two)) {
1543 diff_populate_filespec(p->two, 1);
1544 copied = 0;
1545 added = p->two->size;
1546 diff_free_filespec_data(p->two);
1547 } else
1548 continue;
1549
1550 /*
1551 * Original minus copied is the removed material,
1552 * added is the new material. They are both damages
1553 * made to the preimage. In --dirstat-by-file mode, count
1554 * damaged files, not damaged lines. This is done by
1555 * counting only a single damaged line per file.
1556 */
1557 damage = (p->one->size - copied) + added;
1558 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1559 damage = 1;
1560
1561 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1562 dir.files[dir.nr].name = name;
1563 dir.files[dir.nr].changed = damage;
1564 changed += damage;
1565 dir.nr++;
1566 }
1567
1568 /* This can happen even with many files, if everything was renames */
1569 if (!changed)
1570 return;
1571
1572 /* Show all directories with more than x% of the changes */
1573 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1574 gather_dirstat(options, &dir, changed, "", 0);
1575 }
1576
1577 static void free_diffstat_info(struct diffstat_t *diffstat)
1578 {
1579 int i;
1580 for (i = 0; i < diffstat->nr; i++) {
1581 struct diffstat_file *f = diffstat->files[i];
1582 if (f->name != f->print_name)
1583 free(f->print_name);
1584 free(f->name);
1585 free(f->from_name);
1586 free(f);
1587 }
1588 free(diffstat->files);
1589 }
1590
1591 struct checkdiff_t {
1592 const char *filename;
1593 int lineno;
1594 int conflict_marker_size;
1595 struct diff_options *o;
1596 unsigned ws_rule;
1597 unsigned status;
1598 };
1599
1600 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1601 {
1602 char firstchar;
1603 int cnt;
1604
1605 if (len < marker_size + 1)
1606 return 0;
1607 firstchar = line[0];
1608 switch (firstchar) {
1609 case '=': case '>': case '<': case '|':
1610 break;
1611 default:
1612 return 0;
1613 }
1614 for (cnt = 1; cnt < marker_size; cnt++)
1615 if (line[cnt] != firstchar)
1616 return 0;
1617 /* line[1] thru line[marker_size-1] are same as firstchar */
1618 if (len < marker_size + 1 || !isspace(line[marker_size]))
1619 return 0;
1620 return 1;
1621 }
1622
1623 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1624 {
1625 struct checkdiff_t *data = priv;
1626 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1627 int marker_size = data->conflict_marker_size;
1628 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1629 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1630 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1631 char *err;
1632 char *line_prefix = "";
1633 struct strbuf *msgbuf;
1634
1635 assert(data->o);
1636 if (data->o->output_prefix) {
1637 msgbuf = data->o->output_prefix(data->o,
1638 data->o->output_prefix_data);
1639 line_prefix = msgbuf->buf;
1640 }
1641
1642 if (line[0] == '+') {
1643 unsigned bad;
1644 data->lineno++;
1645 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1646 data->status |= 1;
1647 fprintf(data->o->file,
1648 "%s%s:%d: leftover conflict marker\n",
1649 line_prefix, data->filename, data->lineno);
1650 }
1651 bad = ws_check(line + 1, len - 1, data->ws_rule);
1652 if (!bad)
1653 return;
1654 data->status |= bad;
1655 err = whitespace_error_string(bad);
1656 fprintf(data->o->file, "%s%s:%d: %s.\n",
1657 line_prefix, data->filename, data->lineno, err);
1658 free(err);
1659 emit_line(data->o, set, reset, line, 1);
1660 ws_check_emit(line + 1, len - 1, data->ws_rule,
1661 data->o->file, set, reset, ws);
1662 } else if (line[0] == ' ') {
1663 data->lineno++;
1664 } else if (line[0] == '@') {
1665 char *plus = strchr(line, '+');
1666 if (plus)
1667 data->lineno = strtol(plus, NULL, 10) - 1;
1668 else
1669 die("invalid diff");
1670 }
1671 }
1672
1673 static unsigned char *deflate_it(char *data,
1674 unsigned long size,
1675 unsigned long *result_size)
1676 {
1677 int bound;
1678 unsigned char *deflated;
1679 z_stream stream;
1680
1681 memset(&stream, 0, sizeof(stream));
1682 deflateInit(&stream, zlib_compression_level);
1683 bound = deflateBound(&stream, size);
1684 deflated = xmalloc(bound);
1685 stream.next_out = deflated;
1686 stream.avail_out = bound;
1687
1688 stream.next_in = (unsigned char *)data;
1689 stream.avail_in = size;
1690 while (deflate(&stream, Z_FINISH) == Z_OK)
1691 ; /* nothing */
1692 deflateEnd(&stream);
1693 *result_size = stream.total_out;
1694 return deflated;
1695 }
1696
1697 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1698 {
1699 void *cp;
1700 void *delta;
1701 void *deflated;
1702 void *data;
1703 unsigned long orig_size;
1704 unsigned long delta_size;
1705 unsigned long deflate_size;
1706 unsigned long data_size;
1707
1708 /* We could do deflated delta, or we could do just deflated two,
1709 * whichever is smaller.
1710 */
1711 delta = NULL;
1712 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1713 if (one->size && two->size) {
1714 delta = diff_delta(one->ptr, one->size,
1715 two->ptr, two->size,
1716 &delta_size, deflate_size);
1717 if (delta) {
1718 void *to_free = delta;
1719 orig_size = delta_size;
1720 delta = deflate_it(delta, delta_size, &delta_size);
1721 free(to_free);
1722 }
1723 }
1724
1725 if (delta && delta_size < deflate_size) {
1726 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1727 free(deflated);
1728 data = delta;
1729 data_size = delta_size;
1730 }
1731 else {
1732 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1733 free(delta);
1734 data = deflated;
1735 data_size = deflate_size;
1736 }
1737
1738 /* emit data encoded in base85 */
1739 cp = data;
1740 while (data_size) {
1741 int bytes = (52 < data_size) ? 52 : data_size;
1742 char line[70];
1743 data_size -= bytes;
1744 if (bytes <= 26)
1745 line[0] = bytes + 'A' - 1;
1746 else
1747 line[0] = bytes - 26 + 'a' - 1;
1748 encode_85(line + 1, cp, bytes);
1749 cp = (char *) cp + bytes;
1750 fprintf(file, "%s", prefix);
1751 fputs(line, file);
1752 fputc('\n', file);
1753 }
1754 fprintf(file, "%s\n", prefix);
1755 free(data);
1756 }
1757
1758 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1759 {
1760 fprintf(file, "%sGIT binary patch\n", prefix);
1761 emit_binary_diff_body(file, one, two, prefix);
1762 emit_binary_diff_body(file, two, one, prefix);
1763 }
1764
1765 static void diff_filespec_load_driver(struct diff_filespec *one)
1766 {
1767 if (!one->driver)
1768 one->driver = userdiff_find_by_path(one->path);
1769 if (!one->driver)
1770 one->driver = userdiff_find_by_name("default");
1771 }
1772
1773 int diff_filespec_is_binary(struct diff_filespec *one)
1774 {
1775 if (one->is_binary == -1) {
1776 diff_filespec_load_driver(one);
1777 if (one->driver->binary != -1)
1778 one->is_binary = one->driver->binary;
1779 else {
1780 if (!one->data && DIFF_FILE_VALID(one))
1781 diff_populate_filespec(one, 0);
1782 if (one->data)
1783 one->is_binary = buffer_is_binary(one->data,
1784 one->size);
1785 if (one->is_binary == -1)
1786 one->is_binary = 0;
1787 }
1788 }
1789 return one->is_binary;
1790 }
1791
1792 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1793 {
1794 diff_filespec_load_driver(one);
1795 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1796 }
1797
1798 static const char *userdiff_word_regex(struct diff_filespec *one)
1799 {
1800 diff_filespec_load_driver(one);
1801 return one->driver->word_regex;
1802 }
1803
1804 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1805 {
1806 if (!options->a_prefix)
1807 options->a_prefix = a;
1808 if (!options->b_prefix)
1809 options->b_prefix = b;
1810 }
1811
1812 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1813 {
1814 if (!DIFF_FILE_VALID(one))
1815 return NULL;
1816 if (!S_ISREG(one->mode))
1817 return NULL;
1818 diff_filespec_load_driver(one);
1819 if (!one->driver->textconv)
1820 return NULL;
1821
1822 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1823 struct notes_cache *c = xmalloc(sizeof(*c));
1824 struct strbuf name = STRBUF_INIT;
1825
1826 strbuf_addf(&name, "textconv/%s", one->driver->name);
1827 notes_cache_init(c, name.buf, one->driver->textconv);
1828 one->driver->textconv_cache = c;
1829 }
1830
1831 return one->driver;
1832 }
1833
1834 static void builtin_diff(const char *name_a,
1835 const char *name_b,
1836 struct diff_filespec *one,
1837 struct diff_filespec *two,
1838 const char *xfrm_msg,
1839 int must_show_header,
1840 struct diff_options *o,
1841 int complete_rewrite)
1842 {
1843 mmfile_t mf1, mf2;
1844 const char *lbl[2];
1845 char *a_one, *b_two;
1846 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1847 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1848 const char *a_prefix, *b_prefix;
1849 struct userdiff_driver *textconv_one = NULL;
1850 struct userdiff_driver *textconv_two = NULL;
1851 struct strbuf header = STRBUF_INIT;
1852 struct strbuf *msgbuf;
1853 char *line_prefix = "";
1854
1855 if (o->output_prefix) {
1856 msgbuf = o->output_prefix(o, o->output_prefix_data);
1857 line_prefix = msgbuf->buf;
1858 }
1859
1860 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1861 (!one->mode || S_ISGITLINK(one->mode)) &&
1862 (!two->mode || S_ISGITLINK(two->mode))) {
1863 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1864 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1865 show_submodule_summary(o->file, one ? one->path : two->path,
1866 one->sha1, two->sha1, two->dirty_submodule,
1867 del, add, reset);
1868 return;
1869 }
1870
1871 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1872 textconv_one = get_textconv(one);
1873 textconv_two = get_textconv(two);
1874 }
1875
1876 diff_set_mnemonic_prefix(o, "a/", "b/");
1877 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1878 a_prefix = o->b_prefix;
1879 b_prefix = o->a_prefix;
1880 } else {
1881 a_prefix = o->a_prefix;
1882 b_prefix = o->b_prefix;
1883 }
1884
1885 /* Never use a non-valid filename anywhere if at all possible */
1886 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1887 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1888
1889 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1890 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1891 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1892 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1893 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1894 if (lbl[0][0] == '/') {
1895 /* /dev/null */
1896 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1897 if (xfrm_msg)
1898 strbuf_addstr(&header, xfrm_msg);
1899 must_show_header = 1;
1900 }
1901 else if (lbl[1][0] == '/') {
1902 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1903 if (xfrm_msg)
1904 strbuf_addstr(&header, xfrm_msg);
1905 must_show_header = 1;
1906 }
1907 else {
1908 if (one->mode != two->mode) {
1909 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1910 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1911 must_show_header = 1;
1912 }
1913 if (xfrm_msg)
1914 strbuf_addstr(&header, xfrm_msg);
1915
1916 /*
1917 * we do not run diff between different kind
1918 * of objects.
1919 */
1920 if ((one->mode ^ two->mode) & S_IFMT)
1921 goto free_ab_and_return;
1922 if (complete_rewrite &&
1923 (textconv_one || !diff_filespec_is_binary(one)) &&
1924 (textconv_two || !diff_filespec_is_binary(two))) {
1925 fprintf(o->file, "%s", header.buf);
1926 strbuf_reset(&header);
1927 emit_rewrite_diff(name_a, name_b, one, two,
1928 textconv_one, textconv_two, o);
1929 o->found_changes = 1;
1930 goto free_ab_and_return;
1931 }
1932 }
1933
1934 if (!DIFF_OPT_TST(o, TEXT) &&
1935 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1936 (!textconv_two && diff_filespec_is_binary(two)) )) {
1937 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1938 die("unable to read files to diff");
1939 /* Quite common confusing case */
1940 if (mf1.size == mf2.size &&
1941 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1942 if (must_show_header)
1943 fprintf(o->file, "%s", header.buf);
1944 goto free_ab_and_return;
1945 }
1946 fprintf(o->file, "%s", header.buf);
1947 strbuf_reset(&header);
1948 if (DIFF_OPT_TST(o, BINARY))
1949 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
1950 else
1951 fprintf(o->file, "%sBinary files %s and %s differ\n",
1952 line_prefix, lbl[0], lbl[1]);
1953 o->found_changes = 1;
1954 }
1955 else {
1956 /* Crazy xdl interfaces.. */
1957 const char *diffopts = getenv("GIT_DIFF_OPTS");
1958 xpparam_t xpp;
1959 xdemitconf_t xecfg;
1960 struct emit_callback ecbdata;
1961 const struct userdiff_funcname *pe;
1962
1963 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1964 fprintf(o->file, "%s", header.buf);
1965 strbuf_reset(&header);
1966 }
1967
1968 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1969 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
1970
1971 pe = diff_funcname_pattern(one);
1972 if (!pe)
1973 pe = diff_funcname_pattern(two);
1974
1975 memset(&xpp, 0, sizeof(xpp));
1976 memset(&xecfg, 0, sizeof(xecfg));
1977 memset(&ecbdata, 0, sizeof(ecbdata));
1978 ecbdata.label_path = lbl;
1979 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1980 ecbdata.found_changesp = &o->found_changes;
1981 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1982 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1983 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1984 ecbdata.opt = o;
1985 ecbdata.header = header.len ? &header : NULL;
1986 xpp.flags = o->xdl_opts;
1987 xecfg.ctxlen = o->context;
1988 xecfg.interhunkctxlen = o->interhunkcontext;
1989 xecfg.flags = XDL_EMIT_FUNCNAMES;
1990 if (pe)
1991 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1992 if (!diffopts)
1993 ;
1994 else if (!prefixcmp(diffopts, "--unified="))
1995 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
1996 else if (!prefixcmp(diffopts, "-u"))
1997 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
1998 if (o->word_diff) {
1999 int i;
2000
2001 ecbdata.diff_words =
2002 xcalloc(1, sizeof(struct diff_words_data));
2003 ecbdata.diff_words->type = o->word_diff;
2004 ecbdata.diff_words->opt = o;
2005 if (!o->word_regex)
2006 o->word_regex = userdiff_word_regex(one);
2007 if (!o->word_regex)
2008 o->word_regex = userdiff_word_regex(two);
2009 if (!o->word_regex)
2010 o->word_regex = diff_word_regex_cfg;
2011 if (o->word_regex) {
2012 ecbdata.diff_words->word_regex = (regex_t *)
2013 xmalloc(sizeof(regex_t));
2014 if (regcomp(ecbdata.diff_words->word_regex,
2015 o->word_regex,
2016 REG_EXTENDED | REG_NEWLINE))
2017 die ("Invalid regular expression: %s",
2018 o->word_regex);
2019 }
2020 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2021 if (o->word_diff == diff_words_styles[i].type) {
2022 ecbdata.diff_words->style =
2023 &diff_words_styles[i];
2024 break;
2025 }
2026 }
2027 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2028 struct diff_words_style *st = ecbdata.diff_words->style;
2029 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2030 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2031 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2032 }
2033 }
2034 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2035 &xpp, &xecfg);
2036 if (o->word_diff)
2037 free_diff_words_data(&ecbdata);
2038 if (textconv_one)
2039 free(mf1.ptr);
2040 if (textconv_two)
2041 free(mf2.ptr);
2042 xdiff_clear_find_func(&xecfg);
2043 }
2044
2045 free_ab_and_return:
2046 strbuf_release(&header);
2047 diff_free_filespec_data(one);
2048 diff_free_filespec_data(two);
2049 free(a_one);
2050 free(b_two);
2051 return;
2052 }
2053
2054 static void builtin_diffstat(const char *name_a, const char *name_b,
2055 struct diff_filespec *one,
2056 struct diff_filespec *two,
2057 struct diffstat_t *diffstat,
2058 struct diff_options *o,
2059 int complete_rewrite)
2060 {
2061 mmfile_t mf1, mf2;
2062 struct diffstat_file *data;
2063
2064 data = diffstat_add(diffstat, name_a, name_b);
2065
2066 if (!one || !two) {
2067 data->is_unmerged = 1;
2068 return;
2069 }
2070 if (complete_rewrite) {
2071 diff_populate_filespec(one, 0);
2072 diff_populate_filespec(two, 0);
2073 data->deleted = count_lines(one->data, one->size);
2074 data->added = count_lines(two->data, two->size);
2075 goto free_and_return;
2076 }
2077 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2078 die("unable to read files to diff");
2079
2080 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2081 data->is_binary = 1;
2082 data->added = mf2.size;
2083 data->deleted = mf1.size;
2084 } else {
2085 /* Crazy xdl interfaces.. */
2086 xpparam_t xpp;
2087 xdemitconf_t xecfg;
2088
2089 memset(&xpp, 0, sizeof(xpp));
2090 memset(&xecfg, 0, sizeof(xecfg));
2091 xpp.flags = o->xdl_opts;
2092 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2093 &xpp, &xecfg);
2094 }
2095
2096 free_and_return:
2097 diff_free_filespec_data(one);
2098 diff_free_filespec_data(two);
2099 }
2100
2101 static void builtin_checkdiff(const char *name_a, const char *name_b,
2102 const char *attr_path,
2103 struct diff_filespec *one,
2104 struct diff_filespec *two,
2105 struct diff_options *o)
2106 {
2107 mmfile_t mf1, mf2;
2108 struct checkdiff_t data;
2109
2110 if (!two)
2111 return;
2112
2113 memset(&data, 0, sizeof(data));
2114 data.filename = name_b ? name_b : name_a;
2115 data.lineno = 0;
2116 data.o = o;
2117 data.ws_rule = whitespace_rule(attr_path);
2118 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2119
2120 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2121 die("unable to read files to diff");
2122
2123 /*
2124 * All the other codepaths check both sides, but not checking
2125 * the "old" side here is deliberate. We are checking the newly
2126 * introduced changes, and as long as the "new" side is text, we
2127 * can and should check what it introduces.
2128 */
2129 if (diff_filespec_is_binary(two))
2130 goto free_and_return;
2131 else {
2132 /* Crazy xdl interfaces.. */
2133 xpparam_t xpp;
2134 xdemitconf_t xecfg;
2135
2136 memset(&xpp, 0, sizeof(xpp));
2137 memset(&xecfg, 0, sizeof(xecfg));
2138 xecfg.ctxlen = 1; /* at least one context line */
2139 xpp.flags = 0;
2140 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2141 &xpp, &xecfg);
2142
2143 if (data.ws_rule & WS_BLANK_AT_EOF) {
2144 struct emit_callback ecbdata;
2145 int blank_at_eof;
2146
2147 ecbdata.ws_rule = data.ws_rule;
2148 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2149 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
2150
2151 if (blank_at_eof) {
2152 static char *err;
2153 if (!err)
2154 err = whitespace_error_string(WS_BLANK_AT_EOF);
2155 fprintf(o->file, "%s:%d: %s.\n",
2156 data.filename, blank_at_eof, err);
2157 data.status = 1; /* report errors */
2158 }
2159 }
2160 }
2161 free_and_return:
2162 diff_free_filespec_data(one);
2163 diff_free_filespec_data(two);
2164 if (data.status)
2165 DIFF_OPT_SET(o, CHECK_FAILED);
2166 }
2167
2168 struct diff_filespec *alloc_filespec(const char *path)
2169 {
2170 int namelen = strlen(path);
2171 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2172
2173 memset(spec, 0, sizeof(*spec));
2174 spec->path = (char *)(spec + 1);
2175 memcpy(spec->path, path, namelen+1);
2176 spec->count = 1;
2177 spec->is_binary = -1;
2178 return spec;
2179 }
2180
2181 void free_filespec(struct diff_filespec *spec)
2182 {
2183 if (!--spec->count) {
2184 diff_free_filespec_data(spec);
2185 free(spec);
2186 }
2187 }
2188
2189 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2190 unsigned short mode)
2191 {
2192 if (mode) {
2193 spec->mode = canon_mode(mode);
2194 hashcpy(spec->sha1, sha1);
2195 spec->sha1_valid = !is_null_sha1(sha1);
2196 }
2197 }
2198
2199 /*
2200 * Given a name and sha1 pair, if the index tells us the file in
2201 * the work tree has that object contents, return true, so that
2202 * prepare_temp_file() does not have to inflate and extract.
2203 */
2204 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2205 {
2206 struct cache_entry *ce;
2207 struct stat st;
2208 int pos, len;
2209
2210 /*
2211 * We do not read the cache ourselves here, because the
2212 * benchmark with my previous version that always reads cache
2213 * shows that it makes things worse for diff-tree comparing
2214 * two linux-2.6 kernel trees in an already checked out work
2215 * tree. This is because most diff-tree comparisons deal with
2216 * only a small number of files, while reading the cache is
2217 * expensive for a large project, and its cost outweighs the
2218 * savings we get by not inflating the object to a temporary
2219 * file. Practically, this code only helps when we are used
2220 * by diff-cache --cached, which does read the cache before
2221 * calling us.
2222 */
2223 if (!active_cache)
2224 return 0;
2225
2226 /* We want to avoid the working directory if our caller
2227 * doesn't need the data in a normal file, this system
2228 * is rather slow with its stat/open/mmap/close syscalls,
2229 * and the object is contained in a pack file. The pack
2230 * is probably already open and will be faster to obtain
2231 * the data through than the working directory. Loose
2232 * objects however would tend to be slower as they need
2233 * to be individually opened and inflated.
2234 */
2235 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2236 return 0;
2237
2238 len = strlen(name);
2239 pos = cache_name_pos(name, len);
2240 if (pos < 0)
2241 return 0;
2242 ce = active_cache[pos];
2243
2244 /*
2245 * This is not the sha1 we are looking for, or
2246 * unreusable because it is not a regular file.
2247 */
2248 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2249 return 0;
2250
2251 /*
2252 * If ce is marked as "assume unchanged", there is no
2253 * guarantee that work tree matches what we are looking for.
2254 */
2255 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2256 return 0;
2257
2258 /*
2259 * If ce matches the file in the work tree, we can reuse it.
2260 */
2261 if (ce_uptodate(ce) ||
2262 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2263 return 1;
2264
2265 return 0;
2266 }
2267
2268 static int populate_from_stdin(struct diff_filespec *s)
2269 {
2270 struct strbuf buf = STRBUF_INIT;
2271 size_t size = 0;
2272
2273 if (strbuf_read(&buf, 0, 0) < 0)
2274 return error("error while reading from stdin %s",
2275 strerror(errno));
2276
2277 s->should_munmap = 0;
2278 s->data = strbuf_detach(&buf, &size);
2279 s->size = size;
2280 s->should_free = 1;
2281 return 0;
2282 }
2283
2284 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2285 {
2286 int len;
2287 char *data = xmalloc(100), *dirty = "";
2288
2289 /* Are we looking at the work tree? */
2290 if (s->dirty_submodule)
2291 dirty = "-dirty";
2292
2293 len = snprintf(data, 100,
2294 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2295 s->data = data;
2296 s->size = len;
2297 s->should_free = 1;
2298 if (size_only) {
2299 s->data = NULL;
2300 free(data);
2301 }
2302 return 0;
2303 }
2304
2305 /*
2306 * While doing rename detection and pickaxe operation, we may need to
2307 * grab the data for the blob (or file) for our own in-core comparison.
2308 * diff_filespec has data and size fields for this purpose.
2309 */
2310 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2311 {
2312 int err = 0;
2313 if (!DIFF_FILE_VALID(s))
2314 die("internal error: asking to populate invalid file.");
2315 if (S_ISDIR(s->mode))
2316 return -1;
2317
2318 if (s->data)
2319 return 0;
2320
2321 if (size_only && 0 < s->size)
2322 return 0;
2323
2324 if (S_ISGITLINK(s->mode))
2325 return diff_populate_gitlink(s, size_only);
2326
2327 if (!s->sha1_valid ||
2328 reuse_worktree_file(s->path, s->sha1, 0)) {
2329 struct strbuf buf = STRBUF_INIT;
2330 struct stat st;
2331 int fd;
2332
2333 if (!strcmp(s->path, "-"))
2334 return populate_from_stdin(s);
2335
2336 if (lstat(s->path, &st) < 0) {
2337 if (errno == ENOENT) {
2338 err_empty:
2339 err = -1;
2340 empty:
2341 s->data = (char *)"";
2342 s->size = 0;
2343 return err;
2344 }
2345 }
2346 s->size = xsize_t(st.st_size);
2347 if (!s->size)
2348 goto empty;
2349 if (S_ISLNK(st.st_mode)) {
2350 struct strbuf sb = STRBUF_INIT;
2351
2352 if (strbuf_readlink(&sb, s->path, s->size))
2353 goto err_empty;
2354 s->size = sb.len;
2355 s->data = strbuf_detach(&sb, NULL);
2356 s->should_free = 1;
2357 return 0;
2358 }
2359 if (size_only)
2360 return 0;
2361 fd = open(s->path, O_RDONLY);
2362 if (fd < 0)
2363 goto err_empty;
2364 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2365 close(fd);
2366 s->should_munmap = 1;
2367
2368 /*
2369 * Convert from working tree format to canonical git format
2370 */
2371 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2372 size_t size = 0;
2373 munmap(s->data, s->size);
2374 s->should_munmap = 0;
2375 s->data = strbuf_detach(&buf, &size);
2376 s->size = size;
2377 s->should_free = 1;
2378 }
2379 }
2380 else {
2381 enum object_type type;
2382 if (size_only)
2383 type = sha1_object_info(s->sha1, &s->size);
2384 else {
2385 s->data = read_sha1_file(s->sha1, &type, &s->size);
2386 s->should_free = 1;
2387 }
2388 }
2389 return 0;
2390 }
2391
2392 void diff_free_filespec_blob(struct diff_filespec *s)
2393 {
2394 if (s->should_free)
2395 free(s->data);
2396 else if (s->should_munmap)
2397 munmap(s->data, s->size);
2398
2399 if (s->should_free || s->should_munmap) {
2400 s->should_free = s->should_munmap = 0;
2401 s->data = NULL;
2402 }
2403 }
2404
2405 void diff_free_filespec_data(struct diff_filespec *s)
2406 {
2407 diff_free_filespec_blob(s);
2408 free(s->cnt_data);
2409 s->cnt_data = NULL;
2410 }
2411
2412 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2413 void *blob,
2414 unsigned long size,
2415 const unsigned char *sha1,
2416 int mode)
2417 {
2418 int fd;
2419 struct strbuf buf = STRBUF_INIT;
2420 struct strbuf template = STRBUF_INIT;
2421 char *path_dup = xstrdup(path);
2422 const char *base = basename(path_dup);
2423
2424 /* Generate "XXXXXX_basename.ext" */
2425 strbuf_addstr(&template, "XXXXXX_");
2426 strbuf_addstr(&template, base);
2427
2428 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2429 strlen(base) + 1);
2430 if (fd < 0)
2431 die_errno("unable to create temp-file");
2432 if (convert_to_working_tree(path,
2433 (const char *)blob, (size_t)size, &buf)) {
2434 blob = buf.buf;
2435 size = buf.len;
2436 }
2437 if (write_in_full(fd, blob, size) != size)
2438 die_errno("unable to write temp-file");
2439 close(fd);
2440 temp->name = temp->tmp_path;
2441 strcpy(temp->hex, sha1_to_hex(sha1));
2442 temp->hex[40] = 0;
2443 sprintf(temp->mode, "%06o", mode);
2444 strbuf_release(&buf);
2445 strbuf_release(&template);
2446 free(path_dup);
2447 }
2448
2449 static struct diff_tempfile *prepare_temp_file(const char *name,
2450 struct diff_filespec *one)
2451 {
2452 struct diff_tempfile *temp = claim_diff_tempfile();
2453
2454 if (!DIFF_FILE_VALID(one)) {
2455 not_a_valid_file:
2456 /* A '-' entry produces this for file-2, and
2457 * a '+' entry produces this for file-1.
2458 */
2459 temp->name = "/dev/null";
2460 strcpy(temp->hex, ".");
2461 strcpy(temp->mode, ".");
2462 return temp;
2463 }
2464
2465 if (!remove_tempfile_installed) {
2466 atexit(remove_tempfile);
2467 sigchain_push_common(remove_tempfile_on_signal);
2468 remove_tempfile_installed = 1;
2469 }
2470
2471 if (!one->sha1_valid ||
2472 reuse_worktree_file(name, one->sha1, 1)) {
2473 struct stat st;
2474 if (lstat(name, &st) < 0) {
2475 if (errno == ENOENT)
2476 goto not_a_valid_file;
2477 die_errno("stat(%s)", name);
2478 }
2479 if (S_ISLNK(st.st_mode)) {
2480 struct strbuf sb = STRBUF_INIT;
2481 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2482 die_errno("readlink(%s)", name);
2483 prep_temp_blob(name, temp, sb.buf, sb.len,
2484 (one->sha1_valid ?
2485 one->sha1 : null_sha1),
2486 (one->sha1_valid ?
2487 one->mode : S_IFLNK));
2488 strbuf_release(&sb);
2489 }
2490 else {
2491 /* we can borrow from the file in the work tree */
2492 temp->name = name;
2493 if (!one->sha1_valid)
2494 strcpy(temp->hex, sha1_to_hex(null_sha1));
2495 else
2496 strcpy(temp->hex, sha1_to_hex(one->sha1));
2497 /* Even though we may sometimes borrow the
2498 * contents from the work tree, we always want
2499 * one->mode. mode is trustworthy even when
2500 * !(one->sha1_valid), as long as
2501 * DIFF_FILE_VALID(one).
2502 */
2503 sprintf(temp->mode, "%06o", one->mode);
2504 }
2505 return temp;
2506 }
2507 else {
2508 if (diff_populate_filespec(one, 0))
2509 die("cannot read data blob for %s", one->path);
2510 prep_temp_blob(name, temp, one->data, one->size,
2511 one->sha1, one->mode);
2512 }
2513 return temp;
2514 }
2515
2516 /* An external diff command takes:
2517 *
2518 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2519 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2520 *
2521 */
2522 static void run_external_diff(const char *pgm,
2523 const char *name,
2524 const char *other,
2525 struct diff_filespec *one,
2526 struct diff_filespec *two,
2527 const char *xfrm_msg,
2528 int complete_rewrite)
2529 {
2530 const char *spawn_arg[10];
2531 int retval;
2532 const char **arg = &spawn_arg[0];
2533
2534 if (one && two) {
2535 struct diff_tempfile *temp_one, *temp_two;
2536 const char *othername = (other ? other : name);
2537 temp_one = prepare_temp_file(name, one);
2538 temp_two = prepare_temp_file(othername, two);
2539 *arg++ = pgm;
2540 *arg++ = name;
2541 *arg++ = temp_one->name;
2542 *arg++ = temp_one->hex;
2543 *arg++ = temp_one->mode;
2544 *arg++ = temp_two->name;
2545 *arg++ = temp_two->hex;
2546 *arg++ = temp_two->mode;
2547 if (other) {
2548 *arg++ = other;
2549 *arg++ = xfrm_msg;
2550 }
2551 } else {
2552 *arg++ = pgm;
2553 *arg++ = name;
2554 }
2555 *arg = NULL;
2556 fflush(NULL);
2557 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2558 remove_tempfile();
2559 if (retval) {
2560 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2561 exit(1);
2562 }
2563 }
2564
2565 static int similarity_index(struct diff_filepair *p)
2566 {
2567 return p->score * 100 / MAX_SCORE;
2568 }
2569
2570 static void fill_metainfo(struct strbuf *msg,
2571 const char *name,
2572 const char *other,
2573 struct diff_filespec *one,
2574 struct diff_filespec *two,
2575 struct diff_options *o,
2576 struct diff_filepair *p,
2577 int *must_show_header,
2578 int use_color)
2579 {
2580 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2581 const char *reset = diff_get_color(use_color, DIFF_RESET);
2582 struct strbuf *msgbuf;
2583 char *line_prefix = "";
2584
2585 *must_show_header = 1;
2586 if (o->output_prefix) {
2587 msgbuf = o->output_prefix(o, o->output_prefix_data);
2588 line_prefix = msgbuf->buf;
2589 }
2590 strbuf_init(msg, PATH_MAX * 2 + 300);
2591 switch (p->status) {
2592 case DIFF_STATUS_COPIED:
2593 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2594 line_prefix, set, similarity_index(p));
2595 strbuf_addf(msg, "%s\n%s%scopy from ",
2596 reset, line_prefix, set);
2597 quote_c_style(name, msg, NULL, 0);
2598 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2599 quote_c_style(other, msg, NULL, 0);
2600 strbuf_addf(msg, "%s\n", reset);
2601 break;
2602 case DIFF_STATUS_RENAMED:
2603 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2604 line_prefix, set, similarity_index(p));
2605 strbuf_addf(msg, "%s\n%s%srename from ",
2606 reset, line_prefix, set);
2607 quote_c_style(name, msg, NULL, 0);
2608 strbuf_addf(msg, "%s\n%s%srename to ",
2609 reset, line_prefix, set);
2610 quote_c_style(other, msg, NULL, 0);
2611 strbuf_addf(msg, "%s\n", reset);
2612 break;
2613 case DIFF_STATUS_MODIFIED:
2614 if (p->score) {
2615 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2616 line_prefix,
2617 set, similarity_index(p), reset);
2618 break;
2619 }
2620 /* fallthru */
2621 default:
2622 *must_show_header = 0;
2623 }
2624 if (one && two && hashcmp(one->sha1, two->sha1)) {
2625 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2626
2627 if (DIFF_OPT_TST(o, BINARY)) {
2628 mmfile_t mf;
2629 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2630 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2631 abbrev = 40;
2632 }
2633 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2634 find_unique_abbrev(one->sha1, abbrev));
2635 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2636 if (one->mode == two->mode)
2637 strbuf_addf(msg, " %06o", one->mode);
2638 strbuf_addf(msg, "%s\n", reset);
2639 }
2640 }
2641
2642 static void run_diff_cmd(const char *pgm,
2643 const char *name,
2644 const char *other,
2645 const char *attr_path,
2646 struct diff_filespec *one,
2647 struct diff_filespec *two,
2648 struct strbuf *msg,
2649 struct diff_options *o,
2650 struct diff_filepair *p)
2651 {
2652 const char *xfrm_msg = NULL;
2653 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2654 int must_show_header = 0;
2655
2656 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2657 pgm = NULL;
2658 else {
2659 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2660 if (drv && drv->external)
2661 pgm = drv->external;
2662 }
2663
2664 if (msg) {
2665 /*
2666 * don't use colors when the header is intended for an
2667 * external diff driver
2668 */
2669 fill_metainfo(msg, name, other, one, two, o, p,
2670 &must_show_header,
2671 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2672 xfrm_msg = msg->len ? msg->buf : NULL;
2673 }
2674
2675 if (pgm) {
2676 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2677 complete_rewrite);
2678 return;
2679 }
2680 if (one && two)
2681 builtin_diff(name, other ? other : name,
2682 one, two, xfrm_msg, must_show_header,
2683 o, complete_rewrite);
2684 else
2685 fprintf(o->file, "* Unmerged path %s\n", name);
2686 }
2687
2688 static void diff_fill_sha1_info(struct diff_filespec *one)
2689 {
2690 if (DIFF_FILE_VALID(one)) {
2691 if (!one->sha1_valid) {
2692 struct stat st;
2693 if (!strcmp(one->path, "-")) {
2694 hashcpy(one->sha1, null_sha1);
2695 return;
2696 }
2697 if (lstat(one->path, &st) < 0)
2698 die_errno("stat '%s'", one->path);
2699 if (index_path(one->sha1, one->path, &st, 0))
2700 die("cannot hash %s", one->path);
2701 }
2702 }
2703 else
2704 hashclr(one->sha1);
2705 }
2706
2707 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2708 {
2709 /* Strip the prefix but do not molest /dev/null and absolute paths */
2710 if (*namep && **namep != '/')
2711 *namep += prefix_length;
2712 if (*otherp && **otherp != '/')
2713 *otherp += prefix_length;
2714 }
2715
2716 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2717 {
2718 const char *pgm = external_diff();
2719 struct strbuf msg;
2720 struct diff_filespec *one = p->one;
2721 struct diff_filespec *two = p->two;
2722 const char *name;
2723 const char *other;
2724 const char *attr_path;
2725
2726 name = p->one->path;
2727 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2728 attr_path = name;
2729 if (o->prefix_length)
2730 strip_prefix(o->prefix_length, &name, &other);
2731
2732 if (DIFF_PAIR_UNMERGED(p)) {
2733 run_diff_cmd(pgm, name, NULL, attr_path,
2734 NULL, NULL, NULL, o, p);
2735 return;
2736 }
2737
2738 diff_fill_sha1_info(one);
2739 diff_fill_sha1_info(two);
2740
2741 if (!pgm &&
2742 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2743 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2744 /*
2745 * a filepair that changes between file and symlink
2746 * needs to be split into deletion and creation.
2747 */
2748 struct diff_filespec *null = alloc_filespec(two->path);
2749 run_diff_cmd(NULL, name, other, attr_path,
2750 one, null, &msg, o, p);
2751 free(null);
2752 strbuf_release(&msg);
2753
2754 null = alloc_filespec(one->path);
2755 run_diff_cmd(NULL, name, other, attr_path,
2756 null, two, &msg, o, p);
2757 free(null);
2758 }
2759 else
2760 run_diff_cmd(pgm, name, other, attr_path,
2761 one, two, &msg, o, p);
2762
2763 strbuf_release(&msg);
2764 }
2765
2766 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2767 struct diffstat_t *diffstat)
2768 {
2769 const char *name;
2770 const char *other;
2771 int complete_rewrite = 0;
2772
2773 if (DIFF_PAIR_UNMERGED(p)) {
2774 /* unmerged */
2775 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2776 return;
2777 }
2778
2779 name = p->one->path;
2780 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2781
2782 if (o->prefix_length)
2783 strip_prefix(o->prefix_length, &name, &other);
2784
2785 diff_fill_sha1_info(p->one);
2786 diff_fill_sha1_info(p->two);
2787
2788 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2789 complete_rewrite = 1;
2790 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2791 }
2792
2793 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2794 {
2795 const char *name;
2796 const char *other;
2797 const char *attr_path;
2798
2799 if (DIFF_PAIR_UNMERGED(p)) {
2800 /* unmerged */
2801 return;
2802 }
2803
2804 name = p->one->path;
2805 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2806 attr_path = other ? other : name;
2807
2808 if (o->prefix_length)
2809 strip_prefix(o->prefix_length, &name, &other);
2810
2811 diff_fill_sha1_info(p->one);
2812 diff_fill_sha1_info(p->two);
2813
2814 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2815 }
2816
2817 void diff_setup(struct diff_options *options)
2818 {
2819 memset(options, 0, sizeof(*options));
2820 memset(&diff_queued_diff, 0, sizeof(diff_queued_diff));
2821
2822 options->file = stdout;
2823
2824 options->line_termination = '\n';
2825 options->break_opt = -1;
2826 options->rename_limit = -1;
2827 options->dirstat_percent = 3;
2828 options->context = 3;
2829
2830 options->change = diff_change;
2831 options->add_remove = diff_addremove;
2832 if (diff_use_color_default > 0)
2833 DIFF_OPT_SET(options, COLOR_DIFF);
2834 options->detect_rename = diff_detect_rename_default;
2835
2836 if (diff_no_prefix) {
2837 options->a_prefix = options->b_prefix = "";
2838 } else if (!diff_mnemonic_prefix) {
2839 options->a_prefix = "a/";
2840 options->b_prefix = "b/";
2841 }
2842 }
2843
2844 int diff_setup_done(struct diff_options *options)
2845 {
2846 int count = 0;
2847
2848 if (options->output_format & DIFF_FORMAT_NAME)
2849 count++;
2850 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2851 count++;
2852 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2853 count++;
2854 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2855 count++;
2856 if (count > 1)
2857 die("--name-only, --name-status, --check and -s are mutually exclusive");
2858
2859 /*
2860 * Most of the time we can say "there are changes"
2861 * only by checking if there are changed paths, but
2862 * --ignore-whitespace* options force us to look
2863 * inside contents.
2864 */
2865
2866 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2867 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2868 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2869 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2870 else
2871 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2872
2873 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2874 options->detect_rename = DIFF_DETECT_COPY;
2875
2876 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2877 options->prefix = NULL;
2878 if (options->prefix)
2879 options->prefix_length = strlen(options->prefix);
2880 else
2881 options->prefix_length = 0;
2882
2883 if (options->output_format & (DIFF_FORMAT_NAME |
2884 DIFF_FORMAT_NAME_STATUS |
2885 DIFF_FORMAT_CHECKDIFF |
2886 DIFF_FORMAT_NO_OUTPUT))
2887 options->output_format &= ~(DIFF_FORMAT_RAW |
2888 DIFF_FORMAT_NUMSTAT |
2889 DIFF_FORMAT_DIFFSTAT |
2890 DIFF_FORMAT_SHORTSTAT |
2891 DIFF_FORMAT_DIRSTAT |
2892 DIFF_FORMAT_SUMMARY |
2893 DIFF_FORMAT_PATCH);
2894
2895 /*
2896 * These cases always need recursive; we do not drop caller-supplied
2897 * recursive bits for other formats here.
2898 */
2899 if (options->output_format & (DIFF_FORMAT_PATCH |
2900 DIFF_FORMAT_NUMSTAT |
2901 DIFF_FORMAT_DIFFSTAT |
2902 DIFF_FORMAT_SHORTSTAT |
2903 DIFF_FORMAT_DIRSTAT |
2904 DIFF_FORMAT_SUMMARY |
2905 DIFF_FORMAT_CHECKDIFF))
2906 DIFF_OPT_SET(options, RECURSIVE);
2907 /*
2908 * Also pickaxe would not work very well if you do not say recursive
2909 */
2910 if (options->pickaxe)
2911 DIFF_OPT_SET(options, RECURSIVE);
2912 /*
2913 * When patches are generated, submodules diffed against the work tree
2914 * must be checked for dirtiness too so it can be shown in the output
2915 */
2916 if (options->output_format & DIFF_FORMAT_PATCH)
2917 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2918
2919 if (options->detect_rename && options->rename_limit < 0)
2920 options->rename_limit = diff_rename_limit_default;
2921 if (options->setup & DIFF_SETUP_USE_CACHE) {
2922 if (!active_cache)
2923 /* read-cache does not die even when it fails
2924 * so it is safe for us to do this here. Also
2925 * it does not smudge active_cache or active_nr
2926 * when it fails, so we do not have to worry about
2927 * cleaning it up ourselves either.
2928 */
2929 read_cache();
2930 }
2931 if (options->abbrev <= 0 || 40 < options->abbrev)
2932 options->abbrev = 40; /* full */
2933
2934 /*
2935 * It does not make sense to show the first hit we happened
2936 * to have found. It does not make sense not to return with
2937 * exit code in such a case either.
2938 */
2939 if (DIFF_OPT_TST(options, QUICK)) {
2940 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2941 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2942 }
2943
2944 return 0;
2945 }
2946
2947 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2948 {
2949 char c, *eq;
2950 int len;
2951
2952 if (*arg != '-')
2953 return 0;
2954 c = *++arg;
2955 if (!c)
2956 return 0;
2957 if (c == arg_short) {
2958 c = *++arg;
2959 if (!c)
2960 return 1;
2961 if (val && isdigit(c)) {
2962 char *end;
2963 int n = strtoul(arg, &end, 10);
2964 if (*end)
2965 return 0;
2966 *val = n;
2967 return 1;
2968 }
2969 return 0;
2970 }
2971 if (c != '-')
2972 return 0;
2973 arg++;
2974 eq = strchr(arg, '=');
2975 if (eq)
2976 len = eq - arg;
2977 else
2978 len = strlen(arg);
2979 if (!len || strncmp(arg, arg_long, len))
2980 return 0;
2981 if (eq) {
2982 int n;
2983 char *end;
2984 if (!isdigit(*++eq))
2985 return 0;
2986 n = strtoul(eq, &end, 10);
2987 if (*end)
2988 return 0;
2989 *val = n;
2990 }
2991 return 1;
2992 }
2993
2994 static int diff_scoreopt_parse(const char *opt);
2995
2996 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2997 {
2998 const char *arg = av[0];
2999
3000 /* Output format options */
3001 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3002 options->output_format |= DIFF_FORMAT_PATCH;
3003 else if (opt_arg(arg, 'U', "unified", &options->context))
3004 options->output_format |= DIFF_FORMAT_PATCH;
3005 else if (!strcmp(arg, "--raw"))
3006 options->output_format |= DIFF_FORMAT_RAW;
3007 else if (!strcmp(arg, "--patch-with-raw"))
3008 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3009 else if (!strcmp(arg, "--numstat"))
3010 options->output_format |= DIFF_FORMAT_NUMSTAT;
3011 else if (!strcmp(arg, "--shortstat"))
3012 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3013 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3014 options->output_format |= DIFF_FORMAT_DIRSTAT;
3015 else if (!strcmp(arg, "--cumulative")) {
3016 options->output_format |= DIFF_FORMAT_DIRSTAT;
3017 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3018 } else if (opt_arg(arg, 0, "dirstat-by-file",
3019 &options->dirstat_percent)) {
3020 options->output_format |= DIFF_FORMAT_DIRSTAT;
3021 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3022 }
3023 else if (!strcmp(arg, "--check"))
3024 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3025 else if (!strcmp(arg, "--summary"))
3026 options->output_format |= DIFF_FORMAT_SUMMARY;
3027 else if (!strcmp(arg, "--patch-with-stat"))
3028 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3029 else if (!strcmp(arg, "--name-only"))
3030 options->output_format |= DIFF_FORMAT_NAME;
3031 else if (!strcmp(arg, "--name-status"))
3032 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3033 else if (!strcmp(arg, "-s"))
3034 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3035 else if (!prefixcmp(arg, "--stat")) {
3036 char *end;
3037 int width = options->stat_width;
3038 int name_width = options->stat_name_width;
3039 arg += 6;
3040 end = (char *)arg;
3041
3042 switch (*arg) {
3043 case '-':
3044 if (!prefixcmp(arg, "-width="))
3045 width = strtoul(arg + 7, &end, 10);
3046 else if (!prefixcmp(arg, "-name-width="))
3047 name_width = strtoul(arg + 12, &end, 10);
3048 break;
3049 case '=':
3050 width = strtoul(arg+1, &end, 10);
3051 if (*end == ',')
3052 name_width = strtoul(end+1, &end, 10);
3053 }
3054
3055 /* Important! This checks all the error cases! */
3056 if (*end)
3057 return 0;
3058 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3059 options->stat_name_width = name_width;
3060 options->stat_width = width;
3061 }
3062
3063 /* renames options */
3064 else if (!prefixcmp(arg, "-B")) {
3065 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3066 return -1;
3067 }
3068 else if (!prefixcmp(arg, "-M")) {
3069 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3070 return -1;
3071 options->detect_rename = DIFF_DETECT_RENAME;
3072 }
3073 else if (!prefixcmp(arg, "-C")) {
3074 if (options->detect_rename == DIFF_DETECT_COPY)
3075 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3076 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3077 return -1;
3078 options->detect_rename = DIFF_DETECT_COPY;
3079 }
3080 else if (!strcmp(arg, "--no-renames"))
3081 options->detect_rename = 0;
3082 else if (!strcmp(arg, "--relative"))
3083 DIFF_OPT_SET(options, RELATIVE_NAME);
3084 else if (!prefixcmp(arg, "--relative=")) {
3085 DIFF_OPT_SET(options, RELATIVE_NAME);
3086 options->prefix = arg + 11;
3087 }
3088
3089 /* xdiff options */
3090 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3091 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3092 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3093 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3094 else if (!strcmp(arg, "--ignore-space-at-eol"))
3095 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3096 else if (!strcmp(arg, "--patience"))
3097 DIFF_XDL_SET(options, PATIENCE_DIFF);
3098
3099 /* flags options */
3100 else if (!strcmp(arg, "--binary")) {
3101 options->output_format |= DIFF_FORMAT_PATCH;
3102 DIFF_OPT_SET(options, BINARY);
3103 }
3104 else if (!strcmp(arg, "--full-index"))
3105 DIFF_OPT_SET(options, FULL_INDEX);
3106 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3107 DIFF_OPT_SET(options, TEXT);
3108 else if (!strcmp(arg, "-R"))
3109 DIFF_OPT_SET(options, REVERSE_DIFF);
3110 else if (!strcmp(arg, "--find-copies-harder"))
3111 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3112 else if (!strcmp(arg, "--follow"))
3113 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3114 else if (!strcmp(arg, "--color"))
3115 DIFF_OPT_SET(options, COLOR_DIFF);
3116 else if (!prefixcmp(arg, "--color=")) {
3117 int value = git_config_colorbool(NULL, arg+8, -1);
3118 if (value == 0)
3119 DIFF_OPT_CLR(options, COLOR_DIFF);
3120 else if (value > 0)
3121 DIFF_OPT_SET(options, COLOR_DIFF);
3122 else
3123 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3124 }
3125 else if (!strcmp(arg, "--no-color"))
3126 DIFF_OPT_CLR(options, COLOR_DIFF);
3127 else if (!strcmp(arg, "--color-words")) {
3128 DIFF_OPT_SET(options, COLOR_DIFF);
3129 options->word_diff = DIFF_WORDS_COLOR;
3130 }
3131 else if (!prefixcmp(arg, "--color-words=")) {
3132 DIFF_OPT_SET(options, COLOR_DIFF);
3133 options->word_diff = DIFF_WORDS_COLOR;
3134 options->word_regex = arg + 14;
3135 }
3136 else if (!strcmp(arg, "--word-diff")) {
3137 if (options->word_diff == DIFF_WORDS_NONE)
3138 options->word_diff = DIFF_WORDS_PLAIN;
3139 }
3140 else if (!prefixcmp(arg, "--word-diff=")) {
3141 const char *type = arg + 12;
3142 if (!strcmp(type, "plain"))
3143 options->word_diff = DIFF_WORDS_PLAIN;
3144 else if (!strcmp(type, "color")) {
3145 DIFF_OPT_SET(options, COLOR_DIFF);
3146 options->word_diff = DIFF_WORDS_COLOR;
3147 }
3148 else if (!strcmp(type, "porcelain"))
3149 options->word_diff = DIFF_WORDS_PORCELAIN;
3150 else if (!strcmp(type, "none"))
3151 options->word_diff = DIFF_WORDS_NONE;
3152 else
3153 die("bad --word-diff argument: %s", type);
3154 }
3155 else if (!prefixcmp(arg, "--word-diff-regex=")) {
3156 if (options->word_diff == DIFF_WORDS_NONE)
3157 options->word_diff = DIFF_WORDS_PLAIN;
3158 options->word_regex = arg + 18;
3159 }
3160 else if (!strcmp(arg, "--exit-code"))
3161 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3162 else if (!strcmp(arg, "--quiet"))
3163 DIFF_OPT_SET(options, QUICK);
3164 else if (!strcmp(arg, "--ext-diff"))
3165 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3166 else if (!strcmp(arg, "--no-ext-diff"))
3167 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3168 else if (!strcmp(arg, "--textconv"))
3169 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3170 else if (!strcmp(arg, "--no-textconv"))
3171 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3172 else if (!strcmp(arg, "--ignore-submodules")) {
3173 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3174 handle_ignore_submodules_arg(options, "all");
3175 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3176 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3177 handle_ignore_submodules_arg(options, arg + 20);
3178 } else if (!strcmp(arg, "--submodule"))
3179 DIFF_OPT_SET(options, SUBMODULE_LOG);
3180 else if (!prefixcmp(arg, "--submodule=")) {
3181 if (!strcmp(arg + 12, "log"))
3182 DIFF_OPT_SET(options, SUBMODULE_LOG);
3183 }
3184
3185 /* misc options */
3186 else if (!strcmp(arg, "-z"))
3187 options->line_termination = 0;
3188 else if (!prefixcmp(arg, "-l"))
3189 options->rename_limit = strtoul(arg+2, NULL, 10);
3190 else if (!prefixcmp(arg, "-S"))
3191 options->pickaxe = arg + 2;
3192 else if (!strcmp(arg, "--pickaxe-all"))
3193 options->pickaxe_opts = DIFF_PICKAXE_ALL;
3194 else if (!strcmp(arg, "--pickaxe-regex"))
3195 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
3196 else if (!prefixcmp(arg, "-O"))
3197 options->orderfile = arg + 2;
3198 else if (!prefixcmp(arg, "--diff-filter="))
3199 options->filter = arg + 14;
3200 else if (!strcmp(arg, "--abbrev"))
3201 options->abbrev = DEFAULT_ABBREV;
3202 else if (!prefixcmp(arg, "--abbrev=")) {
3203 options->abbrev = strtoul(arg + 9, NULL, 10);
3204 if (options->abbrev < MINIMUM_ABBREV)
3205 options->abbrev = MINIMUM_ABBREV;
3206 else if (40 < options->abbrev)
3207 options->abbrev = 40;
3208 }
3209 else if (!prefixcmp(arg, "--src-prefix="))
3210 options->a_prefix = arg + 13;
3211 else if (!prefixcmp(arg, "--dst-prefix="))
3212 options->b_prefix = arg + 13;
3213 else if (!strcmp(arg, "--no-prefix"))
3214 options->a_prefix = options->b_prefix = "";
3215 else if (opt_arg(arg, '\0', "inter-hunk-context",
3216 &options->interhunkcontext))
3217 ;
3218 else if (!prefixcmp(arg, "--output=")) {
3219 options->file = fopen(arg + strlen("--output="), "w");
3220 if (!options->file)
3221 die_errno("Could not open '%s'", arg + strlen("--output="));
3222 options->close_file = 1;
3223 } else
3224 return 0;
3225 return 1;
3226 }
3227
3228 static int parse_num(const char **cp_p)
3229 {
3230 unsigned long num, scale;
3231 int ch, dot;
3232 const char *cp = *cp_p;
3233
3234 num = 0;
3235 scale = 1;
3236 dot = 0;
3237 for (;;) {
3238 ch = *cp;
3239 if ( !dot && ch == '.' ) {
3240 scale = 1;
3241 dot = 1;
3242 } else if ( ch == '%' ) {
3243 scale = dot ? scale*100 : 100;
3244 cp++; /* % is always at the end */
3245 break;
3246 } else if ( ch >= '0' && ch <= '9' ) {
3247 if ( scale < 100000 ) {
3248 scale *= 10;
3249 num = (num*10) + (ch-'0');
3250 }
3251 } else {
3252 break;
3253 }
3254 cp++;
3255 }
3256 *cp_p = cp;
3257
3258 /* user says num divided by scale and we say internally that
3259 * is MAX_SCORE * num / scale.
3260 */
3261 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3262 }
3263
3264 static int diff_scoreopt_parse(const char *opt)
3265 {
3266 int opt1, opt2, cmd;
3267
3268 if (*opt++ != '-')
3269 return -1;
3270 cmd = *opt++;
3271 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3272 return -1; /* that is not a -M, -C nor -B option */
3273
3274 opt1 = parse_num(&opt);
3275 if (cmd != 'B')
3276 opt2 = 0;
3277 else {
3278 if (*opt == 0)
3279 opt2 = 0;
3280 else if (*opt != '/')
3281 return -1; /* we expect -B80/99 or -B80 */
3282 else {
3283 opt++;
3284 opt2 = parse_num(&opt);
3285 }
3286 }
3287 if (*opt != 0)
3288 return -1;
3289 return opt1 | (opt2 << 16);
3290 }
3291
3292 struct diff_queue_struct diff_queued_diff;
3293
3294 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3295 {
3296 if (queue->alloc <= queue->nr) {
3297 queue->alloc = alloc_nr(queue->alloc);
3298 queue->queue = xrealloc(queue->queue,
3299 sizeof(dp) * queue->alloc);
3300 }
3301 queue->queue[queue->nr++] = dp;
3302 }
3303
3304 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3305 struct diff_filespec *one,
3306 struct diff_filespec *two)
3307 {
3308 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3309 dp->one = one;
3310 dp->two = two;
3311 if (queue)
3312 diff_q(queue, dp);
3313 return dp;
3314 }
3315
3316 void diff_free_filepair(struct diff_filepair *p)
3317 {
3318 free_filespec(p->one);
3319 free_filespec(p->two);
3320 free(p);
3321 }
3322
3323 /* This is different from find_unique_abbrev() in that
3324 * it stuffs the result with dots for alignment.
3325 */
3326 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3327 {
3328 int abblen;
3329 const char *abbrev;
3330 if (len == 40)
3331 return sha1_to_hex(sha1);
3332
3333 abbrev = find_unique_abbrev(sha1, len);
3334 abblen = strlen(abbrev);
3335 if (abblen < 37) {
3336 static char hex[41];
3337 if (len < abblen && abblen <= len + 2)
3338 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3339 else
3340 sprintf(hex, "%s...", abbrev);
3341 return hex;
3342 }
3343 return sha1_to_hex(sha1);
3344 }
3345
3346 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3347 {
3348 int line_termination = opt->line_termination;
3349 int inter_name_termination = line_termination ? '\t' : '\0';
3350 if (opt->output_prefix) {
3351 struct strbuf *msg = NULL;
3352 msg = opt->output_prefix(opt, opt->output_prefix_data);
3353 fprintf(opt->file, "%s", msg->buf);
3354 }
3355
3356 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3357 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3358 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3359 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3360 }
3361 if (p->score) {
3362 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3363 inter_name_termination);
3364 } else {
3365 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3366 }
3367
3368 if (p->status == DIFF_STATUS_COPIED ||
3369 p->status == DIFF_STATUS_RENAMED) {
3370 const char *name_a, *name_b;
3371 name_a = p->one->path;
3372 name_b = p->two->path;
3373 strip_prefix(opt->prefix_length, &name_a, &name_b);
3374 write_name_quoted(name_a, opt->file, inter_name_termination);
3375 write_name_quoted(name_b, opt->file, line_termination);
3376 } else {
3377 const char *name_a, *name_b;
3378 name_a = p->one->mode ? p->one->path : p->two->path;
3379 name_b = NULL;
3380 strip_prefix(opt->prefix_length, &name_a, &name_b);
3381 write_name_quoted(name_a, opt->file, line_termination);
3382 }
3383 }
3384
3385 int diff_unmodified_pair(struct diff_filepair *p)
3386 {
3387 /* This function is written stricter than necessary to support
3388 * the currently implemented transformers, but the idea is to
3389 * let transformers to produce diff_filepairs any way they want,
3390 * and filter and clean them up here before producing the output.
3391 */
3392 struct diff_filespec *one = p->one, *two = p->two;
3393
3394 if (DIFF_PAIR_UNMERGED(p))
3395 return 0; /* unmerged is interesting */
3396
3397 /* deletion, addition, mode or type change
3398 * and rename are all interesting.
3399 */
3400 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3401 DIFF_PAIR_MODE_CHANGED(p) ||
3402 strcmp(one->path, two->path))
3403 return 0;
3404
3405 /* both are valid and point at the same path. that is, we are
3406 * dealing with a change.
3407 */
3408 if (one->sha1_valid && two->sha1_valid &&
3409 !hashcmp(one->sha1, two->sha1) &&
3410 !one->dirty_submodule && !two->dirty_submodule)
3411 return 1; /* no change */
3412 if (!one->sha1_valid && !two->sha1_valid)
3413 return 1; /* both look at the same file on the filesystem. */
3414 return 0;
3415 }
3416
3417 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3418 {
3419 if (diff_unmodified_pair(p))
3420 return;
3421
3422 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3423 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3424 return; /* no tree diffs in patch format */
3425
3426 run_diff(p, o);
3427 }
3428
3429 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3430 struct diffstat_t *diffstat)
3431 {
3432 if (diff_unmodified_pair(p))
3433 return;
3434
3435 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3436 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3437 return; /* no tree diffs in patch format */
3438
3439 run_diffstat(p, o, diffstat);
3440 }
3441
3442 static void diff_flush_checkdiff(struct diff_filepair *p,
3443 struct diff_options *o)
3444 {
3445 if (diff_unmodified_pair(p))
3446 return;
3447
3448 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3449 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3450 return; /* no tree diffs in patch format */
3451
3452 run_checkdiff(p, o);
3453 }
3454
3455 int diff_queue_is_empty(void)
3456 {
3457 struct diff_queue_struct *q = &diff_queued_diff;
3458 int i;
3459 for (i = 0; i < q->nr; i++)
3460 if (!diff_unmodified_pair(q->queue[i]))
3461 return 0;
3462 return 1;
3463 }
3464
3465 #if DIFF_DEBUG
3466 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3467 {
3468 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3469 x, one ? one : "",
3470 s->path,
3471 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3472 s->mode,
3473 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3474 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3475 x, one ? one : "",
3476 s->size, s->xfrm_flags);
3477 }
3478
3479 void diff_debug_filepair(const struct diff_filepair *p, int i)
3480 {
3481 diff_debug_filespec(p->one, i, "one");
3482 diff_debug_filespec(p->two, i, "two");
3483 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3484 p->score, p->status ? p->status : '?',
3485 p->one->rename_used, p->broken_pair);
3486 }
3487
3488 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3489 {
3490 int i;
3491 if (msg)
3492 fprintf(stderr, "%s\n", msg);
3493 fprintf(stderr, "q->nr = %d\n", q->nr);
3494 for (i = 0; i < q->nr; i++) {
3495 struct diff_filepair *p = q->queue[i];
3496 diff_debug_filepair(p, i);
3497 }
3498 }
3499 #endif
3500
3501 static void diff_resolve_rename_copy(void)
3502 {
3503 int i;
3504 struct diff_filepair *p;
3505 struct diff_queue_struct *q = &diff_queued_diff;
3506
3507 diff_debug_queue("resolve-rename-copy", q);
3508
3509 for (i = 0; i < q->nr; i++) {
3510 p = q->queue[i];
3511 p->status = 0; /* undecided */
3512 if (DIFF_PAIR_UNMERGED(p))
3513 p->status = DIFF_STATUS_UNMERGED;
3514 else if (!DIFF_FILE_VALID(p->one))
3515 p->status = DIFF_STATUS_ADDED;
3516 else if (!DIFF_FILE_VALID(p->two))
3517 p->status = DIFF_STATUS_DELETED;
3518 else if (DIFF_PAIR_TYPE_CHANGED(p))
3519 p->status = DIFF_STATUS_TYPE_CHANGED;
3520
3521 /* from this point on, we are dealing with a pair
3522 * whose both sides are valid and of the same type, i.e.
3523 * either in-place edit or rename/copy edit.
3524 */
3525 else if (DIFF_PAIR_RENAME(p)) {
3526 /*
3527 * A rename might have re-connected a broken
3528 * pair up, causing the pathnames to be the
3529 * same again. If so, that's not a rename at
3530 * all, just a modification..
3531 *
3532 * Otherwise, see if this source was used for
3533 * multiple renames, in which case we decrement
3534 * the count, and call it a copy.
3535 */
3536 if (!strcmp(p->one->path, p->two->path))
3537 p->status = DIFF_STATUS_MODIFIED;
3538 else if (--p->one->rename_used > 0)
3539 p->status = DIFF_STATUS_COPIED;
3540 else
3541 p->status = DIFF_STATUS_RENAMED;
3542 }
3543 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3544 p->one->mode != p->two->mode ||
3545 p->one->dirty_submodule ||
3546 p->two->dirty_submodule ||
3547 is_null_sha1(p->one->sha1))
3548 p->status = DIFF_STATUS_MODIFIED;
3549 else {
3550 /* This is a "no-change" entry and should not
3551 * happen anymore, but prepare for broken callers.
3552 */
3553 error("feeding unmodified %s to diffcore",
3554 p->one->path);
3555 p->status = DIFF_STATUS_UNKNOWN;
3556 }
3557 }
3558 diff_debug_queue("resolve-rename-copy done", q);
3559 }
3560
3561 static int check_pair_status(struct diff_filepair *p)
3562 {
3563 switch (p->status) {
3564 case DIFF_STATUS_UNKNOWN:
3565 return 0;
3566 case 0:
3567 die("internal error in diff-resolve-rename-copy");
3568 default:
3569 return 1;
3570 }
3571 }
3572
3573 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3574 {
3575 int fmt = opt->output_format;
3576
3577 if (fmt & DIFF_FORMAT_CHECKDIFF)
3578 diff_flush_checkdiff(p, opt);
3579 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3580 diff_flush_raw(p, opt);
3581 else if (fmt & DIFF_FORMAT_NAME) {
3582 const char *name_a, *name_b;
3583 name_a = p->two->path;
3584 name_b = NULL;
3585 strip_prefix(opt->prefix_length, &name_a, &name_b);
3586 write_name_quoted(name_a, opt->file, opt->line_termination);
3587 }
3588 }
3589
3590 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3591 {
3592 if (fs->mode)
3593 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3594 else
3595 fprintf(file, " %s ", newdelete);
3596 write_name_quoted(fs->path, file, '\n');
3597 }
3598
3599
3600 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3601 const char *line_prefix)
3602 {
3603 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3604 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3605 p->two->mode, show_name ? ' ' : '\n');
3606 if (show_name) {
3607 write_name_quoted(p->two->path, file, '\n');
3608 }
3609 }
3610 }
3611
3612 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3613 const char *line_prefix)
3614 {
3615 char *names = pprint_rename(p->one->path, p->two->path);
3616
3617 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3618 free(names);
3619 show_mode_change(file, p, 0, line_prefix);
3620 }
3621
3622 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3623 {
3624 FILE *file = opt->file;
3625 char *line_prefix = "";
3626
3627 if (opt->output_prefix) {
3628 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3629 line_prefix = buf->buf;
3630 }
3631
3632 switch(p->status) {
3633 case DIFF_STATUS_DELETED:
3634 fputs(line_prefix, file