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Add the 'diff.ignoreSubmodules' config setting
[git/kusma.git] / diff.c
blob1ddfdfbc2cf0e147cd5991d022fb16736389d4eb
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include "cache.h"
5 #include "quote.h"
6 #include "diff.h"
7 #include "diffcore.h"
8 #include "delta.h"
9 #include "xdiff-interface.h"
10 #include "color.h"
11 #include "attr.h"
12 #include "run-command.h"
13 #include "utf8.h"
14 #include "userdiff.h"
15 #include "sigchain.h"
16 #include "submodule.h"
17 #include "ll-merge.h"
18
19 #ifdef NO_FAST_WORKING_DIRECTORY
20 #define FAST_WORKING_DIRECTORY 0
21 #else
22 #define FAST_WORKING_DIRECTORY 1
23 #endif
24
25 static int diff_detect_rename_default;
26 static int diff_rename_limit_default = 200;
27 static int diff_suppress_blank_empty;
28 int diff_use_color_default = -1;
29 static const char *diff_word_regex_cfg;
30 static const char *external_diff_cmd_cfg;
31 int diff_auto_refresh_index = 1;
32 static int diff_mnemonic_prefix;
33 static int diff_no_prefix;
34 static struct diff_options default_diff_options;
35
36 static char diff_colors[][COLOR_MAXLEN] = {
37 GIT_COLOR_RESET,
38 GIT_COLOR_NORMAL, /* PLAIN */
39 GIT_COLOR_BOLD, /* METAINFO */
40 GIT_COLOR_CYAN, /* FRAGINFO */
41 GIT_COLOR_RED, /* OLD */
42 GIT_COLOR_GREEN, /* NEW */
43 GIT_COLOR_YELLOW, /* COMMIT */
44 GIT_COLOR_BG_RED, /* WHITESPACE */
45 GIT_COLOR_NORMAL, /* FUNCINFO */
46 };
47
48 static int parse_diff_color_slot(const char *var, int ofs)
49 {
50 if (!strcasecmp(var+ofs, "plain"))
51 return DIFF_PLAIN;
52 if (!strcasecmp(var+ofs, "meta"))
53 return DIFF_METAINFO;
54 if (!strcasecmp(var+ofs, "frag"))
55 return DIFF_FRAGINFO;
56 if (!strcasecmp(var+ofs, "old"))
57 return DIFF_FILE_OLD;
58 if (!strcasecmp(var+ofs, "new"))
59 return DIFF_FILE_NEW;
60 if (!strcasecmp(var+ofs, "commit"))
61 return DIFF_COMMIT;
62 if (!strcasecmp(var+ofs, "whitespace"))
63 return DIFF_WHITESPACE;
64 if (!strcasecmp(var+ofs, "func"))
65 return DIFF_FUNCINFO;
66 return -1;
67 }
68
69 static int git_config_rename(const char *var, const char *value)
70 {
71 if (!value)
72 return DIFF_DETECT_RENAME;
73 if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
74 return DIFF_DETECT_COPY;
75 return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
76 }
77
78 /*
79 * These are to give UI layer defaults.
80 * The core-level commands such as git-diff-files should
81 * never be affected by the setting of diff.renames
82 * the user happens to have in the configuration file.
83 */
84 int git_diff_ui_config(const char *var, const char *value, void *cb)
85 {
86 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
87 diff_use_color_default = git_config_colorbool(var, value, -1);
88 return 0;
89 }
90 if (!strcmp(var, "diff.renames")) {
91 diff_detect_rename_default = git_config_rename(var, value);
92 return 0;
93 }
94 if (!strcmp(var, "diff.autorefreshindex")) {
95 diff_auto_refresh_index = git_config_bool(var, value);
96 return 0;
97 }
98 if (!strcmp(var, "diff.mnemonicprefix")) {
99 diff_mnemonic_prefix = git_config_bool(var, value);
100 return 0;
101 }
102 if (!strcmp(var, "diff.noprefix")) {
103 diff_no_prefix = git_config_bool(var, value);
104 return 0;
105 }
106 if (!strcmp(var, "diff.external"))
107 return git_config_string(&external_diff_cmd_cfg, var, value);
108 if (!strcmp(var, "diff.wordregex"))
109 return git_config_string(&diff_word_regex_cfg, var, value);
110
111 if (!strcmp(var, "diff.ignoresubmodules"))
112 handle_ignore_submodules_arg(&default_diff_options, value);
113
114 return git_diff_basic_config(var, value, cb);
115 }
116
117 int git_diff_basic_config(const char *var, const char *value, void *cb)
118 {
119 if (!strcmp(var, "diff.renamelimit")) {
120 diff_rename_limit_default = git_config_int(var, value);
121 return 0;
122 }
123
124 switch (userdiff_config(var, value)) {
125 case 0: break;
126 case -1: return -1;
127 default: return 0;
128 }
129
130 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
131 int slot = parse_diff_color_slot(var, 11);
132 if (slot < 0)
133 return 0;
134 if (!value)
135 return config_error_nonbool(var);
136 color_parse(value, var, diff_colors[slot]);
137 return 0;
138 }
139
140 /* like GNU diff's --suppress-blank-empty option */
141 if (!strcmp(var, "diff.suppressblankempty") ||
142 /* for backwards compatibility */
143 !strcmp(var, "diff.suppress-blank-empty")) {
144 diff_suppress_blank_empty = git_config_bool(var, value);
145 return 0;
146 }
147
148 if (!prefixcmp(var, "submodule."))
149 return parse_submodule_config_option(var, value);
150
151 return git_color_default_config(var, value, cb);
152 }
153
154 static char *quote_two(const char *one, const char *two)
155 {
156 int need_one = quote_c_style(one, NULL, NULL, 1);
157 int need_two = quote_c_style(two, NULL, NULL, 1);
158 struct strbuf res = STRBUF_INIT;
159
160 if (need_one + need_two) {
161 strbuf_addch(&res, '"');
162 quote_c_style(one, &res, NULL, 1);
163 quote_c_style(two, &res, NULL, 1);
164 strbuf_addch(&res, '"');
165 } else {
166 strbuf_addstr(&res, one);
167 strbuf_addstr(&res, two);
168 }
169 return strbuf_detach(&res, NULL);
170 }
171
172 static const char *external_diff(void)
173 {
174 static const char *external_diff_cmd = NULL;
175 static int done_preparing = 0;
176
177 if (done_preparing)
178 return external_diff_cmd;
179 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
180 if (!external_diff_cmd)
181 external_diff_cmd = external_diff_cmd_cfg;
182 done_preparing = 1;
183 return external_diff_cmd;
184 }
185
186 static struct diff_tempfile {
187 const char *name; /* filename external diff should read from */
188 char hex[41];
189 char mode[10];
190 char tmp_path[PATH_MAX];
191 } diff_temp[2];
192
193 typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
194
195 struct emit_callback {
196 int color_diff;
197 unsigned ws_rule;
198 int blank_at_eof_in_preimage;
199 int blank_at_eof_in_postimage;
200 int lno_in_preimage;
201 int lno_in_postimage;
202 sane_truncate_fn truncate;
203 const char **label_path;
204 struct diff_words_data *diff_words;
205 struct diff_options *opt;
206 int *found_changesp;
207 struct strbuf *header;
208 };
209
210 static int count_lines(const char *data, int size)
211 {
212 int count, ch, completely_empty = 1, nl_just_seen = 0;
213 count = 0;
214 while (0 < size--) {
215 ch = *data++;
216 if (ch == '\n') {
217 count++;
218 nl_just_seen = 1;
219 completely_empty = 0;
220 }
221 else {
222 nl_just_seen = 0;
223 completely_empty = 0;
224 }
225 }
226 if (completely_empty)
227 return 0;
228 if (!nl_just_seen)
229 count++; /* no trailing newline */
230 return count;
231 }
232
233 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
234 {
235 if (!DIFF_FILE_VALID(one)) {
236 mf->ptr = (char *)""; /* does not matter */
237 mf->size = 0;
238 return 0;
239 }
240 else if (diff_populate_filespec(one, 0))
241 return -1;
242
243 mf->ptr = one->data;
244 mf->size = one->size;
245 return 0;
246 }
247
248 static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
249 {
250 char *ptr = mf->ptr;
251 long size = mf->size;
252 int cnt = 0;
253
254 if (!size)
255 return cnt;
256 ptr += size - 1; /* pointing at the very end */
257 if (*ptr != '\n')
258 ; /* incomplete line */
259 else
260 ptr--; /* skip the last LF */
261 while (mf->ptr < ptr) {
262 char *prev_eol;
263 for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
264 if (*prev_eol == '\n')
265 break;
266 if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
267 break;
268 cnt++;
269 ptr = prev_eol - 1;
270 }
271 return cnt;
272 }
273
274 static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
275 struct emit_callback *ecbdata)
276 {
277 int l1, l2, at;
278 unsigned ws_rule = ecbdata->ws_rule;
279 l1 = count_trailing_blank(mf1, ws_rule);
280 l2 = count_trailing_blank(mf2, ws_rule);
281 if (l2 <= l1) {
282 ecbdata->blank_at_eof_in_preimage = 0;
283 ecbdata->blank_at_eof_in_postimage = 0;
284 return;
285 }
286 at = count_lines(mf1->ptr, mf1->size);
287 ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
288
289 at = count_lines(mf2->ptr, mf2->size);
290 ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
291 }
292
293 static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
294 int first, const char *line, int len)
295 {
296 int has_trailing_newline, has_trailing_carriage_return;
297 int nofirst;
298 FILE *file = o->file;
299
300 if (o->output_prefix) {
301 struct strbuf *msg = NULL;
302 msg = o->output_prefix(o, o->output_prefix_data);
303 assert(msg);
304 fwrite(msg->buf, msg->len, 1, file);
305 }
306
307 if (len == 0) {
308 has_trailing_newline = (first == '\n');
309 has_trailing_carriage_return = (!has_trailing_newline &&
310 (first == '\r'));
311 nofirst = has_trailing_newline || has_trailing_carriage_return;
312 } else {
313 has_trailing_newline = (len > 0 && line[len-1] == '\n');
314 if (has_trailing_newline)
315 len--;
316 has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
317 if (has_trailing_carriage_return)
318 len--;
319 nofirst = 0;
320 }
321
322 if (len || !nofirst) {
323 fputs(set, file);
324 if (!nofirst)
325 fputc(first, file);
326 fwrite(line, len, 1, file);
327 fputs(reset, file);
328 }
329 if (has_trailing_carriage_return)
330 fputc('\r', file);
331 if (has_trailing_newline)
332 fputc('\n', file);
333 }
334
335 static void emit_line(struct diff_options *o, const char *set, const char *reset,
336 const char *line, int len)
337 {
338 emit_line_0(o, set, reset, line[0], line+1, len-1);
339 }
340
341 static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
342 {
343 if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
344 ecbdata->blank_at_eof_in_preimage &&
345 ecbdata->blank_at_eof_in_postimage &&
346 ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
347 ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
348 return 0;
349 return ws_blank_line(line, len, ecbdata->ws_rule);
350 }
351
352 static void emit_add_line(const char *reset,
353 struct emit_callback *ecbdata,
354 const char *line, int len)
355 {
356 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
357 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
358
359 if (!*ws)
360 emit_line_0(ecbdata->opt, set, reset, '+', line, len);
361 else if (new_blank_line_at_eof(ecbdata, line, len))
362 /* Blank line at EOF - paint '+' as well */
363 emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
364 else {
365 /* Emit just the prefix, then the rest. */
366 emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
367 ws_check_emit(line, len, ecbdata->ws_rule,
368 ecbdata->opt->file, set, reset, ws);
369 }
370 }
371
372 static void emit_hunk_header(struct emit_callback *ecbdata,
373 const char *line, int len)
374 {
375 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
376 const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
377 const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
378 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
379 static const char atat[2] = { '@', '@' };
380 const char *cp, *ep;
381 struct strbuf msgbuf = STRBUF_INIT;
382 int org_len = len;
383 int i = 1;
384
385 /*
386 * As a hunk header must begin with "@@ -<old>, +<new> @@",
387 * it always is at least 10 bytes long.
388 */
389 if (len < 10 ||
390 memcmp(line, atat, 2) ||
391 !(ep = memmem(line + 2, len - 2, atat, 2))) {
392 emit_line(ecbdata->opt, plain, reset, line, len);
393 return;
394 }
395 ep += 2; /* skip over @@ */
396
397 /* The hunk header in fraginfo color */
398 strbuf_add(&msgbuf, frag, strlen(frag));
399 strbuf_add(&msgbuf, line, ep - line);
400 strbuf_add(&msgbuf, reset, strlen(reset));
401
402 /*
403 * trailing "\r\n"
404 */
405 for ( ; i < 3; i++)
406 if (line[len - i] == '\r' || line[len - i] == '\n')
407 len--;
408
409 /* blank before the func header */
410 for (cp = ep; ep - line < len; ep++)
411 if (*ep != ' ' && *ep != '\t')
412 break;
413 if (ep != cp) {
414 strbuf_add(&msgbuf, plain, strlen(plain));
415 strbuf_add(&msgbuf, cp, ep - cp);
416 strbuf_add(&msgbuf, reset, strlen(reset));
417 }
418
419 if (ep < line + len) {
420 strbuf_add(&msgbuf, func, strlen(func));
421 strbuf_add(&msgbuf, ep, line + len - ep);
422 strbuf_add(&msgbuf, reset, strlen(reset));
423 }
424
425 strbuf_add(&msgbuf, line + len, org_len - len);
426 emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
427 strbuf_release(&msgbuf);
428 }
429
430 static struct diff_tempfile *claim_diff_tempfile(void) {
431 int i;
432 for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
433 if (!diff_temp[i].name)
434 return diff_temp + i;
435 die("BUG: diff is failing to clean up its tempfiles");
436 }
437
438 static int remove_tempfile_installed;
439
440 static void remove_tempfile(void)
441 {
442 int i;
443 for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
444 if (diff_temp[i].name == diff_temp[i].tmp_path)
445 unlink_or_warn(diff_temp[i].name);
446 diff_temp[i].name = NULL;
447 }
448 }
449
450 static void remove_tempfile_on_signal(int signo)
451 {
452 remove_tempfile();
453 sigchain_pop(signo);
454 raise(signo);
455 }
456
457 static void print_line_count(FILE *file, int count)
458 {
459 switch (count) {
460 case 0:
461 fprintf(file, "0,0");
462 break;
463 case 1:
464 fprintf(file, "1");
465 break;
466 default:
467 fprintf(file, "1,%d", count);
468 break;
469 }
470 }
471
472 static void emit_rewrite_lines(struct emit_callback *ecb,
473 int prefix, const char *data, int size)
474 {
475 const char *endp = NULL;
476 static const char *nneof = " No newline at end of file\n";
477 const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
478 const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
479
480 while (0 < size) {
481 int len;
482
483 endp = memchr(data, '\n', size);
484 len = endp ? (endp - data + 1) : size;
485 if (prefix != '+') {
486 ecb->lno_in_preimage++;
487 emit_line_0(ecb->opt, old, reset, '-',
488 data, len);
489 } else {
490 ecb->lno_in_postimage++;
491 emit_add_line(reset, ecb, data, len);
492 }
493 size -= len;
494 data += len;
495 }
496 if (!endp) {
497 const char *plain = diff_get_color(ecb->color_diff,
498 DIFF_PLAIN);
499 emit_line_0(ecb->opt, plain, reset, '\\',
500 nneof, strlen(nneof));
501 }
502 }
503
504 static void emit_rewrite_diff(const char *name_a,
505 const char *name_b,
506 struct diff_filespec *one,
507 struct diff_filespec *two,
508 struct userdiff_driver *textconv_one,
509 struct userdiff_driver *textconv_two,
510 struct diff_options *o)
511 {
512 int lc_a, lc_b;
513 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
514 const char *name_a_tab, *name_b_tab;
515 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
516 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
517 const char *reset = diff_get_color(color_diff, DIFF_RESET);
518 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
519 const char *a_prefix, *b_prefix;
520 char *data_one, *data_two;
521 size_t size_one, size_two;
522 struct emit_callback ecbdata;
523 char *line_prefix = "";
524 struct strbuf *msgbuf;
525
526 if (o && o->output_prefix) {
527 msgbuf = o->output_prefix(o, o->output_prefix_data);
528 line_prefix = msgbuf->buf;
529 }
530
531 if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
532 a_prefix = o->b_prefix;
533 b_prefix = o->a_prefix;
534 } else {
535 a_prefix = o->a_prefix;
536 b_prefix = o->b_prefix;
537 }
538
539 name_a += (*name_a == '/');
540 name_b += (*name_b == '/');
541 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
542 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
543
544 strbuf_reset(&a_name);
545 strbuf_reset(&b_name);
546 quote_two_c_style(&a_name, a_prefix, name_a, 0);
547 quote_two_c_style(&b_name, b_prefix, name_b, 0);
548
549 size_one = fill_textconv(textconv_one, one, &data_one);
550 size_two = fill_textconv(textconv_two, two, &data_two);
551
552 memset(&ecbdata, 0, sizeof(ecbdata));
553 ecbdata.color_diff = color_diff;
554 ecbdata.found_changesp = &o->found_changes;
555 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
556 ecbdata.opt = o;
557 if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
558 mmfile_t mf1, mf2;
559 mf1.ptr = (char *)data_one;
560 mf2.ptr = (char *)data_two;
561 mf1.size = size_one;
562 mf2.size = size_two;
563 check_blank_at_eof(&mf1, &mf2, &ecbdata);
564 }
565 ecbdata.lno_in_preimage = 1;
566 ecbdata.lno_in_postimage = 1;
567
568 lc_a = count_lines(data_one, size_one);
569 lc_b = count_lines(data_two, size_two);
570 fprintf(o->file,
571 "%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
572 line_prefix, metainfo, a_name.buf, name_a_tab, reset,
573 line_prefix, metainfo, b_name.buf, name_b_tab, reset,
574 line_prefix, fraginfo);
575 print_line_count(o->file, lc_a);
576 fprintf(o->file, " +");
577 print_line_count(o->file, lc_b);
578 fprintf(o->file, " @@%s\n", reset);
579 if (lc_a)
580 emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
581 if (lc_b)
582 emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
583 if (textconv_one)
584 free((char *)data_one);
585 if (textconv_two)
586 free((char *)data_two);
587 }
588
589 struct diff_words_buffer {
590 mmfile_t text;
591 long alloc;
592 struct diff_words_orig {
593 const char *begin, *end;
594 } *orig;
595 int orig_nr, orig_alloc;
596 };
597
598 static void diff_words_append(char *line, unsigned long len,
599 struct diff_words_buffer *buffer)
600 {
601 ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
602 line++;
603 len--;
604 memcpy(buffer->text.ptr + buffer->text.size, line, len);
605 buffer->text.size += len;
606 buffer->text.ptr[buffer->text.size] = '\0';
607 }
608
609 struct diff_words_style_elem
610 {
611 const char *prefix;
612 const char *suffix;
613 const char *color; /* NULL; filled in by the setup code if
614 * color is enabled */
615 };
616
617 struct diff_words_style
618 {
619 enum diff_words_type type;
620 struct diff_words_style_elem new, old, ctx;
621 const char *newline;
622 };
623
624 struct diff_words_style diff_words_styles[] = {
625 { DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
626 { DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
627 { DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
628 };
629
630 struct diff_words_data {
631 struct diff_words_buffer minus, plus;
632 const char *current_plus;
633 int last_minus;
634 struct diff_options *opt;
635 regex_t *word_regex;
636 enum diff_words_type type;
637 struct diff_words_style *style;
638 };
639
640 static int fn_out_diff_words_write_helper(FILE *fp,
641 struct diff_words_style_elem *st_el,
642 const char *newline,
643 size_t count, const char *buf,
644 const char *line_prefix)
645 {
646 int print = 0;
647
648 while (count) {
649 char *p = memchr(buf, '\n', count);
650 if (print)
651 fputs(line_prefix, fp);
652 if (p != buf) {
653 if (st_el->color && fputs(st_el->color, fp) < 0)
654 return -1;
655 if (fputs(st_el->prefix, fp) < 0 ||
656 fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
657 fputs(st_el->suffix, fp) < 0)
658 return -1;
659 if (st_el->color && *st_el->color
660 && fputs(GIT_COLOR_RESET, fp) < 0)
661 return -1;
662 }
663 if (!p)
664 return 0;
665 if (fputs(newline, fp) < 0)
666 return -1;
667 count -= p + 1 - buf;
668 buf = p + 1;
669 print = 1;
670 }
671 return 0;
672 }
673
674 /*
675 * '--color-words' algorithm can be described as:
676 *
677 * 1. collect a the minus/plus lines of a diff hunk, divided into
678 * minus-lines and plus-lines;
679 *
680 * 2. break both minus-lines and plus-lines into words and
681 * place them into two mmfile_t with one word for each line;
682 *
683 * 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
684 *
685 * And for the common parts of the both file, we output the plus side text.
686 * diff_words->current_plus is used to trace the current position of the plus file
687 * which printed. diff_words->last_minus is used to trace the last minus word
688 * printed.
689 *
690 * For '--graph' to work with '--color-words', we need to output the graph prefix
691 * on each line of color words output. Generally, there are two conditions on
692 * which we should output the prefix.
693 *
694 * 1. diff_words->last_minus == 0 &&
695 * diff_words->current_plus == diff_words->plus.text.ptr
696 *
697 * that is: the plus text must start as a new line, and if there is no minus
698 * word printed, a graph prefix must be printed.
699 *
700 * 2. diff_words->current_plus > diff_words->plus.text.ptr &&
701 * *(diff_words->current_plus - 1) == '\n'
702 *
703 * that is: a graph prefix must be printed following a '\n'
704 */
705 static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
706 {
707 if ((diff_words->last_minus == 0 &&
708 diff_words->current_plus == diff_words->plus.text.ptr) ||
709 (diff_words->current_plus > diff_words->plus.text.ptr &&
710 *(diff_words->current_plus - 1) == '\n')) {
711 return 1;
712 } else {
713 return 0;
714 }
715 }
716
717 static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
718 {
719 struct diff_words_data *diff_words = priv;
720 struct diff_words_style *style = diff_words->style;
721 int minus_first, minus_len, plus_first, plus_len;
722 const char *minus_begin, *minus_end, *plus_begin, *plus_end;
723 struct diff_options *opt = diff_words->opt;
724 struct strbuf *msgbuf;
725 char *line_prefix = "";
726
727 if (line[0] != '@' || parse_hunk_header(line, len,
728 &minus_first, &minus_len, &plus_first, &plus_len))
729 return;
730
731 assert(opt);
732 if (opt->output_prefix) {
733 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
734 line_prefix = msgbuf->buf;
735 }
736
737 /* POSIX requires that first be decremented by one if len == 0... */
738 if (minus_len) {
739 minus_begin = diff_words->minus.orig[minus_first].begin;
740 minus_end =
741 diff_words->minus.orig[minus_first + minus_len - 1].end;
742 } else
743 minus_begin = minus_end =
744 diff_words->minus.orig[minus_first].end;
745
746 if (plus_len) {
747 plus_begin = diff_words->plus.orig[plus_first].begin;
748 plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
749 } else
750 plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
751
752 if (color_words_output_graph_prefix(diff_words)) {
753 fputs(line_prefix, diff_words->opt->file);
754 }
755 if (diff_words->current_plus != plus_begin) {
756 fn_out_diff_words_write_helper(diff_words->opt->file,
757 &style->ctx, style->newline,
758 plus_begin - diff_words->current_plus,
759 diff_words->current_plus, line_prefix);
760 if (*(plus_begin - 1) == '\n')
761 fputs(line_prefix, diff_words->opt->file);
762 }
763 if (minus_begin != minus_end) {
764 fn_out_diff_words_write_helper(diff_words->opt->file,
765 &style->old, style->newline,
766 minus_end - minus_begin, minus_begin,
767 line_prefix);
768 }
769 if (plus_begin != plus_end) {
770 fn_out_diff_words_write_helper(diff_words->opt->file,
771 &style->new, style->newline,
772 plus_end - plus_begin, plus_begin,
773 line_prefix);
774 }
775
776 diff_words->current_plus = plus_end;
777 diff_words->last_minus = minus_first;
778 }
779
780 /* This function starts looking at *begin, and returns 0 iff a word was found. */
781 static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
782 int *begin, int *end)
783 {
784 if (word_regex && *begin < buffer->size) {
785 regmatch_t match[1];
786 if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
787 char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
788 '\n', match[0].rm_eo - match[0].rm_so);
789 *end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
790 *begin += match[0].rm_so;
791 return *begin >= *end;
792 }
793 return -1;
794 }
795
796 /* find the next word */
797 while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
798 (*begin)++;
799 if (*begin >= buffer->size)
800 return -1;
801
802 /* find the end of the word */
803 *end = *begin + 1;
804 while (*end < buffer->size && !isspace(buffer->ptr[*end]))
805 (*end)++;
806
807 return 0;
808 }
809
810 /*
811 * This function splits the words in buffer->text, stores the list with
812 * newline separator into out, and saves the offsets of the original words
813 * in buffer->orig.
814 */
815 static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
816 regex_t *word_regex)
817 {
818 int i, j;
819 long alloc = 0;
820
821 out->size = 0;
822 out->ptr = NULL;
823
824 /* fake an empty "0th" word */
825 ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
826 buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
827 buffer->orig_nr = 1;
828
829 for (i = 0; i < buffer->text.size; i++) {
830 if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
831 return;
832
833 /* store original boundaries */
834 ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
835 buffer->orig_alloc);
836 buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
837 buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
838 buffer->orig_nr++;
839
840 /* store one word */
841 ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
842 memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
843 out->ptr[out->size + j - i] = '\n';
844 out->size += j - i + 1;
845
846 i = j - 1;
847 }
848 }
849
850 /* this executes the word diff on the accumulated buffers */
851 static void diff_words_show(struct diff_words_data *diff_words)
852 {
853 xpparam_t xpp;
854 xdemitconf_t xecfg;
855 mmfile_t minus, plus;
856 struct diff_words_style *style = diff_words->style;
857
858 struct diff_options *opt = diff_words->opt;
859 struct strbuf *msgbuf;
860 char *line_prefix = "";
861
862 assert(opt);
863 if (opt->output_prefix) {
864 msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
865 line_prefix = msgbuf->buf;
866 }
867
868 /* special case: only removal */
869 if (!diff_words->plus.text.size) {
870 fputs(line_prefix, diff_words->opt->file);
871 fn_out_diff_words_write_helper(diff_words->opt->file,
872 &style->old, style->newline,
873 diff_words->minus.text.size,
874 diff_words->minus.text.ptr, line_prefix);
875 diff_words->minus.text.size = 0;
876 return;
877 }
878
879 diff_words->current_plus = diff_words->plus.text.ptr;
880 diff_words->last_minus = 0;
881
882 memset(&xpp, 0, sizeof(xpp));
883 memset(&xecfg, 0, sizeof(xecfg));
884 diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
885 diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
886 xpp.flags = 0;
887 /* as only the hunk header will be parsed, we need a 0-context */
888 xecfg.ctxlen = 0;
889 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
890 &xpp, &xecfg);
891 free(minus.ptr);
892 free(plus.ptr);
893 if (diff_words->current_plus != diff_words->plus.text.ptr +
894 diff_words->plus.text.size) {
895 if (color_words_output_graph_prefix(diff_words))
896 fputs(line_prefix, diff_words->opt->file);
897 fn_out_diff_words_write_helper(diff_words->opt->file,
898 &style->ctx, style->newline,
899 diff_words->plus.text.ptr + diff_words->plus.text.size
900 - diff_words->current_plus, diff_words->current_plus,
901 line_prefix);
902 }
903 diff_words->minus.text.size = diff_words->plus.text.size = 0;
904 }
905
906 /* In "color-words" mode, show word-diff of words accumulated in the buffer */
907 static void diff_words_flush(struct emit_callback *ecbdata)
908 {
909 if (ecbdata->diff_words->minus.text.size ||
910 ecbdata->diff_words->plus.text.size)
911 diff_words_show(ecbdata->diff_words);
912 }
913
914 static void free_diff_words_data(struct emit_callback *ecbdata)
915 {
916 if (ecbdata->diff_words) {
917 diff_words_flush(ecbdata);
918 free (ecbdata->diff_words->minus.text.ptr);
919 free (ecbdata->diff_words->minus.orig);
920 free (ecbdata->diff_words->plus.text.ptr);
921 free (ecbdata->diff_words->plus.orig);
922 free(ecbdata->diff_words->word_regex);
923 free(ecbdata->diff_words);
924 ecbdata->diff_words = NULL;
925 }
926 }
927
928 const char *diff_get_color(int diff_use_color, enum color_diff ix)
929 {
930 if (diff_use_color)
931 return diff_colors[ix];
932 return "";
933 }
934
935 static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
936 {
937 const char *cp;
938 unsigned long allot;
939 size_t l = len;
940
941 if (ecb->truncate)
942 return ecb->truncate(line, len);
943 cp = line;
944 allot = l;
945 while (0 < l) {
946 (void) utf8_width(&cp, &l);
947 if (!cp)
948 break; /* truncated in the middle? */
949 }
950 return allot - l;
951 }
952
953 static void find_lno(const char *line, struct emit_callback *ecbdata)
954 {
955 const char *p;
956 ecbdata->lno_in_preimage = 0;
957 ecbdata->lno_in_postimage = 0;
958 p = strchr(line, '-');
959 if (!p)
960 return; /* cannot happen */
961 ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
962 p = strchr(p, '+');
963 if (!p)
964 return; /* cannot happen */
965 ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
966 }
967
968 static void fn_out_consume(void *priv, char *line, unsigned long len)
969 {
970 struct emit_callback *ecbdata = priv;
971 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
972 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
973 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
974 struct diff_options *o = ecbdata->opt;
975 char *line_prefix = "";
976 struct strbuf *msgbuf;
977
978 if (o && o->output_prefix) {
979 msgbuf = o->output_prefix(o, o->output_prefix_data);
980 line_prefix = msgbuf->buf;
981 }
982
983 if (ecbdata->header) {
984 fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
985 strbuf_reset(ecbdata->header);
986 ecbdata->header = NULL;
987 }
988 *(ecbdata->found_changesp) = 1;
989
990 if (ecbdata->label_path[0]) {
991 const char *name_a_tab, *name_b_tab;
992
993 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
994 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
995
996 fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
997 line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
998 fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
999 line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
1000 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
1001 }
1002
1003 if (diff_suppress_blank_empty
1004 && len == 2 && line[0] == ' ' && line[1] == '\n') {
1005 line[0] = '\n';
1006 len = 1;
1007 }
1008
1009 if (line[0] == '@') {
1010 if (ecbdata->diff_words)
1011 diff_words_flush(ecbdata);
1012 len = sane_truncate_line(ecbdata, line, len);
1013 find_lno(line, ecbdata);
1014 emit_hunk_header(ecbdata, line, len);
1015 if (line[len-1] != '\n')
1016 putc('\n', ecbdata->opt->file);
1017 return;
1018 }
1019
1020 if (len < 1) {
1021 emit_line(ecbdata->opt, reset, reset, line, len);
1022 if (ecbdata->diff_words
1023 && ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
1024 fputs("~\n", ecbdata->opt->file);
1025 return;
1026 }
1027
1028 if (ecbdata->diff_words) {
1029 if (line[0] == '-') {
1030 diff_words_append(line, len,
1031 &ecbdata->diff_words->minus);
1032 return;
1033 } else if (line[0] == '+') {
1034 diff_words_append(line, len,
1035 &ecbdata->diff_words->plus);
1036 return;
1037 }
1038 diff_words_flush(ecbdata);
1039 if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
1040 emit_line(ecbdata->opt, plain, reset, line, len);
1041 fputs("~\n", ecbdata->opt->file);
1042 } else {
1043 /* don't print the prefix character */
1044 emit_line(ecbdata->opt, plain, reset, line+1, len-1);
1045 }
1046 return;
1047 }
1048
1049 if (line[0] != '+') {
1050 const char *color =
1051 diff_get_color(ecbdata->color_diff,
1052 line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
1053 ecbdata->lno_in_preimage++;
1054 if (line[0] == ' ')
1055 ecbdata->lno_in_postimage++;
1056 emit_line(ecbdata->opt, color, reset, line, len);
1057 } else {
1058 ecbdata->lno_in_postimage++;
1059 emit_add_line(reset, ecbdata, line + 1, len - 1);
1060 }
1061 }
1062
1063 static char *pprint_rename(const char *a, const char *b)
1064 {
1065 const char *old = a;
1066 const char *new = b;
1067 struct strbuf name = STRBUF_INIT;
1068 int pfx_length, sfx_length;
1069 int len_a = strlen(a);
1070 int len_b = strlen(b);
1071 int a_midlen, b_midlen;
1072 int qlen_a = quote_c_style(a, NULL, NULL, 0);
1073 int qlen_b = quote_c_style(b, NULL, NULL, 0);
1074
1075 if (qlen_a || qlen_b) {
1076 quote_c_style(a, &name, NULL, 0);
1077 strbuf_addstr(&name, " => ");
1078 quote_c_style(b, &name, NULL, 0);
1079 return strbuf_detach(&name, NULL);
1080 }
1081
1082 /* Find common prefix */
1083 pfx_length = 0;
1084 while (*old && *new && *old == *new) {
1085 if (*old == '/')
1086 pfx_length = old - a + 1;
1087 old++;
1088 new++;
1089 }
1090
1091 /* Find common suffix */
1092 old = a + len_a;
1093 new = b + len_b;
1094 sfx_length = 0;
1095 while (a <= old && b <= new && *old == *new) {
1096 if (*old == '/')
1097 sfx_length = len_a - (old - a);
1098 old--;
1099 new--;
1100 }
1101
1102 /*
1103 * pfx{mid-a => mid-b}sfx
1104 * {pfx-a => pfx-b}sfx
1105 * pfx{sfx-a => sfx-b}
1106 * name-a => name-b
1107 */
1108 a_midlen = len_a - pfx_length - sfx_length;
1109 b_midlen = len_b - pfx_length - sfx_length;
1110 if (a_midlen < 0)
1111 a_midlen = 0;
1112 if (b_midlen < 0)
1113 b_midlen = 0;
1114
1115 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
1116 if (pfx_length + sfx_length) {
1117 strbuf_add(&name, a, pfx_length);
1118 strbuf_addch(&name, '{');
1119 }
1120 strbuf_add(&name, a + pfx_length, a_midlen);
1121 strbuf_addstr(&name, " => ");
1122 strbuf_add(&name, b + pfx_length, b_midlen);
1123 if (pfx_length + sfx_length) {
1124 strbuf_addch(&name, '}');
1125 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
1126 }
1127 return strbuf_detach(&name, NULL);
1128 }
1129
1130 struct diffstat_t {
1131 int nr;
1132 int alloc;
1133 struct diffstat_file {
1134 char *from_name;
1135 char *name;
1136 char *print_name;
1137 unsigned is_unmerged:1;
1138 unsigned is_binary:1;
1139 unsigned is_renamed:1;
1140 uintmax_t added, deleted;
1141 } **files;
1142 };
1143
1144 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
1145 const char *name_a,
1146 const char *name_b)
1147 {
1148 struct diffstat_file *x;
1149 x = xcalloc(sizeof (*x), 1);
1150 if (diffstat->nr == diffstat->alloc) {
1151 diffstat->alloc = alloc_nr(diffstat->alloc);
1152 diffstat->files = xrealloc(diffstat->files,
1153 diffstat->alloc * sizeof(x));
1154 }
1155 diffstat->files[diffstat->nr++] = x;
1156 if (name_b) {
1157 x->from_name = xstrdup(name_a);
1158 x->name = xstrdup(name_b);
1159 x->is_renamed = 1;
1160 }
1161 else {
1162 x->from_name = NULL;
1163 x->name = xstrdup(name_a);
1164 }
1165 return x;
1166 }
1167
1168 static void diffstat_consume(void *priv, char *line, unsigned long len)
1169 {
1170 struct diffstat_t *diffstat = priv;
1171 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
1172
1173 if (line[0] == '+')
1174 x->added++;
1175 else if (line[0] == '-')
1176 x->deleted++;
1177 }
1178
1179 const char mime_boundary_leader[] = "------------";
1180
1181 static int scale_linear(int it, int width, int max_change)
1182 {
1183 /*
1184 * make sure that at least one '-' is printed if there were deletions,
1185 * and likewise for '+'.
1186 */
1187 if (max_change < 2)
1188 return it;
1189 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
1190 }
1191
1192 static void show_name(FILE *file,
1193 const char *prefix, const char *name, int len)
1194 {
1195 fprintf(file, " %s%-*s |", prefix, len, name);
1196 }
1197
1198 static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
1199 {
1200 if (cnt <= 0)
1201 return;
1202 fprintf(file, "%s", set);
1203 while (cnt--)
1204 putc(ch, file);
1205 fprintf(file, "%s", reset);
1206 }
1207
1208 static void fill_print_name(struct diffstat_file *file)
1209 {
1210 char *pname;
1211
1212 if (file->print_name)
1213 return;
1214
1215 if (!file->is_renamed) {
1216 struct strbuf buf = STRBUF_INIT;
1217 if (quote_c_style(file->name, &buf, NULL, 0)) {
1218 pname = strbuf_detach(&buf, NULL);
1219 } else {
1220 pname = file->name;
1221 strbuf_release(&buf);
1222 }
1223 } else {
1224 pname = pprint_rename(file->from_name, file->name);
1225 }
1226 file->print_name = pname;
1227 }
1228
1229 static void show_stats(struct diffstat_t *data, struct diff_options *options)
1230 {
1231 int i, len, add, del, adds = 0, dels = 0;
1232 uintmax_t max_change = 0, max_len = 0;
1233 int total_files = data->nr;
1234 int width, name_width;
1235 const char *reset, *set, *add_c, *del_c;
1236 const char *line_prefix = "";
1237 struct strbuf *msg = NULL;
1238
1239 if (data->nr == 0)
1240 return;
1241
1242 if (options->output_prefix) {
1243 msg = options->output_prefix(options, options->output_prefix_data);
1244 line_prefix = msg->buf;
1245 }
1246
1247 width = options->stat_width ? options->stat_width : 80;
1248 name_width = options->stat_name_width ? options->stat_name_width : 50;
1249
1250 /* Sanity: give at least 5 columns to the graph,
1251 * but leave at least 10 columns for the name.
1252 */
1253 if (width < 25)
1254 width = 25;
1255 if (name_width < 10)
1256 name_width = 10;
1257 else if (width < name_width + 15)
1258 name_width = width - 15;
1259
1260 /* Find the longest filename and max number of changes */
1261 reset = diff_get_color_opt(options, DIFF_RESET);
1262 set = diff_get_color_opt(options, DIFF_PLAIN);
1263 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
1264 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
1265
1266 for (i = 0; i < data->nr; i++) {
1267 struct diffstat_file *file = data->files[i];
1268 uintmax_t change = file->added + file->deleted;
1269 fill_print_name(file);
1270 len = strlen(file->print_name);
1271 if (max_len < len)
1272 max_len = len;
1273
1274 if (file->is_binary || file->is_unmerged)
1275 continue;
1276 if (max_change < change)
1277 max_change = change;
1278 }
1279
1280 /* Compute the width of the graph part;
1281 * 10 is for one blank at the beginning of the line plus
1282 * " | count " between the name and the graph.
1283 *
1284 * From here on, name_width is the width of the name area,
1285 * and width is the width of the graph area.
1286 */
1287 name_width = (name_width < max_len) ? name_width : max_len;
1288 if (width < (name_width + 10) + max_change)
1289 width = width - (name_width + 10);
1290 else
1291 width = max_change;
1292
1293 for (i = 0; i < data->nr; i++) {
1294 const char *prefix = "";
1295 char *name = data->files[i]->print_name;
1296 uintmax_t added = data->files[i]->added;
1297 uintmax_t deleted = data->files[i]->deleted;
1298 int name_len;
1299
1300 /*
1301 * "scale" the filename
1302 */
1303 len = name_width;
1304 name_len = strlen(name);
1305 if (name_width < name_len) {
1306 char *slash;
1307 prefix = "...";
1308 len -= 3;
1309 name += name_len - len;
1310 slash = strchr(name, '/');
1311 if (slash)
1312 name = slash;
1313 }
1314
1315 if (data->files[i]->is_binary) {
1316 fprintf(options->file, "%s", line_prefix);
1317 show_name(options->file, prefix, name, len);
1318 fprintf(options->file, " Bin ");
1319 fprintf(options->file, "%s%"PRIuMAX"%s",
1320 del_c, deleted, reset);
1321 fprintf(options->file, " -> ");
1322 fprintf(options->file, "%s%"PRIuMAX"%s",
1323 add_c, added, reset);
1324 fprintf(options->file, " bytes");
1325 fprintf(options->file, "\n");
1326 continue;
1327 }
1328 else if (data->files[i]->is_unmerged) {
1329 fprintf(options->file, "%s", line_prefix);
1330 show_name(options->file, prefix, name, len);
1331 fprintf(options->file, " Unmerged\n");
1332 continue;
1333 }
1334 else if (!data->files[i]->is_renamed &&
1335 (added + deleted == 0)) {
1336 total_files--;
1337 continue;
1338 }
1339
1340 /*
1341 * scale the add/delete
1342 */
1343 add = added;
1344 del = deleted;
1345 adds += add;
1346 dels += del;
1347
1348 if (width <= max_change) {
1349 add = scale_linear(add, width, max_change);
1350 del = scale_linear(del, width, max_change);
1351 }
1352 fprintf(options->file, "%s", line_prefix);
1353 show_name(options->file, prefix, name, len);
1354 fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
1355 added + deleted ? " " : "");
1356 show_graph(options->file, '+', add, add_c, reset);
1357 show_graph(options->file, '-', del, del_c, reset);
1358 fprintf(options->file, "\n");
1359 }
1360 fprintf(options->file, "%s", line_prefix);
1361 fprintf(options->file,
1362 " %d files changed, %d insertions(+), %d deletions(-)\n",
1363 total_files, adds, dels);
1364 }
1365
1366 static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
1367 {
1368 int i, adds = 0, dels = 0, total_files = data->nr;
1369
1370 if (data->nr == 0)
1371 return;
1372
1373 for (i = 0; i < data->nr; i++) {
1374 if (!data->files[i]->is_binary &&
1375 !data->files[i]->is_unmerged) {
1376 int added = data->files[i]->added;
1377 int deleted= data->files[i]->deleted;
1378 if (!data->files[i]->is_renamed &&
1379 (added + deleted == 0)) {
1380 total_files--;
1381 } else {
1382 adds += added;
1383 dels += deleted;
1384 }
1385 }
1386 }
1387 if (options->output_prefix) {
1388 struct strbuf *msg = NULL;
1389 msg = options->output_prefix(options,
1390 options->output_prefix_data);
1391 fprintf(options->file, "%s", msg->buf);
1392 }
1393 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
1394 total_files, adds, dels);
1395 }
1396
1397 static void show_numstat(struct diffstat_t *data, struct diff_options *options)
1398 {
1399 int i;
1400
1401 if (data->nr == 0)
1402 return;
1403
1404 for (i = 0; i < data->nr; i++) {
1405 struct diffstat_file *file = data->files[i];
1406
1407 if (options->output_prefix) {
1408 struct strbuf *msg = NULL;
1409 msg = options->output_prefix(options,
1410 options->output_prefix_data);
1411 fprintf(options->file, "%s", msg->buf);
1412 }
1413
1414 if (file->is_binary)
1415 fprintf(options->file, "-\t-\t");
1416 else
1417 fprintf(options->file,
1418 "%"PRIuMAX"\t%"PRIuMAX"\t",
1419 file->added, file->deleted);
1420 if (options->line_termination) {
1421 fill_print_name(file);
1422 if (!file->is_renamed)
1423 write_name_quoted(file->name, options->file,
1424 options->line_termination);
1425 else {
1426 fputs(file->print_name, options->file);
1427 putc(options->line_termination, options->file);
1428 }
1429 } else {
1430 if (file->is_renamed) {
1431 putc('\0', options->file);
1432 write_name_quoted(file->from_name, options->file, '\0');
1433 }
1434 write_name_quoted(file->name, options->file, '\0');
1435 }
1436 }
1437 }
1438
1439 struct dirstat_file {
1440 const char *name;
1441 unsigned long changed;
1442 };
1443
1444 struct dirstat_dir {
1445 struct dirstat_file *files;
1446 int alloc, nr, percent, cumulative;
1447 };
1448
1449 static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
1450 unsigned long changed, const char *base, int baselen)
1451 {
1452 unsigned long this_dir = 0;
1453 unsigned int sources = 0;
1454 const char *line_prefix = "";
1455 struct strbuf *msg = NULL;
1456
1457 if (opt->output_prefix) {
1458 msg = opt->output_prefix(opt, opt->output_prefix_data);
1459 line_prefix = msg->buf;
1460 }
1461
1462 while (dir->nr) {
1463 struct dirstat_file *f = dir->files;
1464 int namelen = strlen(f->name);
1465 unsigned long this;
1466 char *slash;
1467
1468 if (namelen < baselen)
1469 break;
1470 if (memcmp(f->name, base, baselen))
1471 break;
1472 slash = strchr(f->name + baselen, '/');
1473 if (slash) {
1474 int newbaselen = slash + 1 - f->name;
1475 this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
1476 sources++;
1477 } else {
1478 this = f->changed;
1479 dir->files++;
1480 dir->nr--;
1481 sources += 2;
1482 }
1483 this_dir += this;
1484 }
1485
1486 /*
1487 * We don't report dirstat's for
1488 * - the top level
1489 * - or cases where everything came from a single directory
1490 * under this directory (sources == 1).
1491 */
1492 if (baselen && sources != 1) {
1493 int permille = this_dir * 1000 / changed;
1494 if (permille) {
1495 int percent = permille / 10;
1496 if (percent >= dir->percent) {
1497 fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
1498 percent, permille % 10, baselen, base);
1499 if (!dir->cumulative)
1500 return 0;
1501 }
1502 }
1503 }
1504 return this_dir;
1505 }
1506
1507 static int dirstat_compare(const void *_a, const void *_b)
1508 {
1509 const struct dirstat_file *a = _a;
1510 const struct dirstat_file *b = _b;
1511 return strcmp(a->name, b->name);
1512 }
1513
1514 static void show_dirstat(struct diff_options *options)
1515 {
1516 int i;
1517 unsigned long changed;
1518 struct dirstat_dir dir;
1519 struct diff_queue_struct *q = &diff_queued_diff;
1520
1521 dir.files = NULL;
1522 dir.alloc = 0;
1523 dir.nr = 0;
1524 dir.percent = options->dirstat_percent;
1525 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
1526
1527 changed = 0;
1528 for (i = 0; i < q->nr; i++) {
1529 struct diff_filepair *p = q->queue[i];
1530 const char *name;
1531 unsigned long copied, added, damage;
1532
1533 name = p->one->path ? p->one->path : p->two->path;
1534
1535 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1536 diff_populate_filespec(p->one, 0);
1537 diff_populate_filespec(p->two, 0);
1538 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1539 &copied, &added);
1540 diff_free_filespec_data(p->one);
1541 diff_free_filespec_data(p->two);
1542 } else if (DIFF_FILE_VALID(p->one)) {
1543 diff_populate_filespec(p->one, 1);
1544 copied = added = 0;
1545 diff_free_filespec_data(p->one);
1546 } else if (DIFF_FILE_VALID(p->two)) {
1547 diff_populate_filespec(p->two, 1);
1548 copied = 0;
1549 added = p->two->size;
1550 diff_free_filespec_data(p->two);
1551 } else
1552 continue;
1553
1554 /*
1555 * Original minus copied is the removed material,
1556 * added is the new material. They are both damages
1557 * made to the preimage. In --dirstat-by-file mode, count
1558 * damaged files, not damaged lines. This is done by
1559 * counting only a single damaged line per file.
1560 */
1561 damage = (p->one->size - copied) + added;
1562 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1563 damage = 1;
1564
1565 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1566 dir.files[dir.nr].name = name;
1567 dir.files[dir.nr].changed = damage;
1568 changed += damage;
1569 dir.nr++;
1570 }
1571
1572 /* This can happen even with many files, if everything was renames */
1573 if (!changed)
1574 return;
1575
1576 /* Show all directories with more than x% of the changes */
1577 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
1578 gather_dirstat(options, &dir, changed, "", 0);
1579 }
1580
1581 static void free_diffstat_info(struct diffstat_t *diffstat)
1582 {
1583 int i;
1584 for (i = 0; i < diffstat->nr; i++) {
1585 struct diffstat_file *f = diffstat->files[i];
1586 if (f->name != f->print_name)
1587 free(f->print_name);
1588 free(f->name);
1589 free(f->from_name);
1590 free(f);
1591 }
1592 free(diffstat->files);
1593 }
1594
1595 struct checkdiff_t {
1596 const char *filename;
1597 int lineno;
1598 int conflict_marker_size;
1599 struct diff_options *o;
1600 unsigned ws_rule;
1601 unsigned status;
1602 };
1603
1604 static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
1605 {
1606 char firstchar;
1607 int cnt;
1608
1609 if (len < marker_size + 1)
1610 return 0;
1611 firstchar = line[0];
1612 switch (firstchar) {
1613 case '=': case '>': case '<': case '|':
1614 break;
1615 default:
1616 return 0;
1617 }
1618 for (cnt = 1; cnt < marker_size; cnt++)
1619 if (line[cnt] != firstchar)
1620 return 0;
1621 /* line[1] thru line[marker_size-1] are same as firstchar */
1622 if (len < marker_size + 1 || !isspace(line[marker_size]))
1623 return 0;
1624 return 1;
1625 }
1626
1627 static void checkdiff_consume(void *priv, char *line, unsigned long len)
1628 {
1629 struct checkdiff_t *data = priv;
1630 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1631 int marker_size = data->conflict_marker_size;
1632 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1633 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1634 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
1635 char *err;
1636 char *line_prefix = "";
1637 struct strbuf *msgbuf;
1638
1639 assert(data->o);
1640 if (data->o->output_prefix) {
1641 msgbuf = data->o->output_prefix(data->o,
1642 data->o->output_prefix_data);
1643 line_prefix = msgbuf->buf;
1644 }
1645
1646 if (line[0] == '+') {
1647 unsigned bad;
1648 data->lineno++;
1649 if (is_conflict_marker(line + 1, marker_size, len - 1)) {
1650 data->status |= 1;
1651 fprintf(data->o->file,
1652 "%s%s:%d: leftover conflict marker\n",
1653 line_prefix, data->filename, data->lineno);
1654 }
1655 bad = ws_check(line + 1, len - 1, data->ws_rule);
1656 if (!bad)
1657 return;
1658 data->status |= bad;
1659 err = whitespace_error_string(bad);
1660 fprintf(data->o->file, "%s%s:%d: %s.\n",
1661 line_prefix, data->filename, data->lineno, err);
1662 free(err);
1663 emit_line(data->o, set, reset, line, 1);
1664 ws_check_emit(line + 1, len - 1, data->ws_rule,
1665 data->o->file, set, reset, ws);
1666 } else if (line[0] == ' ') {
1667 data->lineno++;
1668 } else if (line[0] == '@') {
1669 char *plus = strchr(line, '+');
1670 if (plus)
1671 data->lineno = strtol(plus, NULL, 10) - 1;
1672 else
1673 die("invalid diff");
1674 }
1675 }
1676
1677 static unsigned char *deflate_it(char *data,
1678 unsigned long size,
1679 unsigned long *result_size)
1680 {
1681 int bound;
1682 unsigned char *deflated;
1683 z_stream stream;
1684
1685 memset(&stream, 0, sizeof(stream));
1686 deflateInit(&stream, zlib_compression_level);
1687 bound = deflateBound(&stream, size);
1688 deflated = xmalloc(bound);
1689 stream.next_out = deflated;
1690 stream.avail_out = bound;
1691
1692 stream.next_in = (unsigned char *)data;
1693 stream.avail_in = size;
1694 while (deflate(&stream, Z_FINISH) == Z_OK)
1695 ; /* nothing */
1696 deflateEnd(&stream);
1697 *result_size = stream.total_out;
1698 return deflated;
1699 }
1700
1701 static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1702 {
1703 void *cp;
1704 void *delta;
1705 void *deflated;
1706 void *data;
1707 unsigned long orig_size;
1708 unsigned long delta_size;
1709 unsigned long deflate_size;
1710 unsigned long data_size;
1711
1712 /* We could do deflated delta, or we could do just deflated two,
1713 * whichever is smaller.
1714 */
1715 delta = NULL;
1716 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1717 if (one->size && two->size) {
1718 delta = diff_delta(one->ptr, one->size,
1719 two->ptr, two->size,
1720 &delta_size, deflate_size);
1721 if (delta) {
1722 void *to_free = delta;
1723 orig_size = delta_size;
1724 delta = deflate_it(delta, delta_size, &delta_size);
1725 free(to_free);
1726 }
1727 }
1728
1729 if (delta && delta_size < deflate_size) {
1730 fprintf(file, "%sdelta %lu\n", prefix, orig_size);
1731 free(deflated);
1732 data = delta;
1733 data_size = delta_size;
1734 }
1735 else {
1736 fprintf(file, "%sliteral %lu\n", prefix, two->size);
1737 free(delta);
1738 data = deflated;
1739 data_size = deflate_size;
1740 }
1741
1742 /* emit data encoded in base85 */
1743 cp = data;
1744 while (data_size) {
1745 int bytes = (52 < data_size) ? 52 : data_size;
1746 char line[70];
1747 data_size -= bytes;
1748 if (bytes <= 26)
1749 line[0] = bytes + 'A' - 1;
1750 else
1751 line[0] = bytes - 26 + 'a' - 1;
1752 encode_85(line + 1, cp, bytes);
1753 cp = (char *) cp + bytes;
1754 fprintf(file, "%s", prefix);
1755 fputs(line, file);
1756 fputc('\n', file);
1757 }
1758 fprintf(file, "%s\n", prefix);
1759 free(data);
1760 }
1761
1762 static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
1763 {
1764 fprintf(file, "%sGIT binary patch\n", prefix);
1765 emit_binary_diff_body(file, one, two, prefix);
1766 emit_binary_diff_body(file, two, one, prefix);
1767 }
1768
1769 static void diff_filespec_load_driver(struct diff_filespec *one)
1770 {
1771 if (!one->driver)
1772 one->driver = userdiff_find_by_path(one->path);
1773 if (!one->driver)
1774 one->driver = userdiff_find_by_name("default");
1775 }
1776
1777 int diff_filespec_is_binary(struct diff_filespec *one)
1778 {
1779 if (one->is_binary == -1) {
1780 diff_filespec_load_driver(one);
1781 if (one->driver->binary != -1)
1782 one->is_binary = one->driver->binary;
1783 else {
1784 if (!one->data && DIFF_FILE_VALID(one))
1785 diff_populate_filespec(one, 0);
1786 if (one->data)
1787 one->is_binary = buffer_is_binary(one->data,
1788 one->size);
1789 if (one->is_binary == -1)
1790 one->is_binary = 0;
1791 }
1792 }
1793 return one->is_binary;
1794 }
1795
1796 static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
1797 {
1798 diff_filespec_load_driver(one);
1799 return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
1800 }
1801
1802 static const char *userdiff_word_regex(struct diff_filespec *one)
1803 {
1804 diff_filespec_load_driver(one);
1805 return one->driver->word_regex;
1806 }
1807
1808 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
1809 {
1810 if (!options->a_prefix)
1811 options->a_prefix = a;
1812 if (!options->b_prefix)
1813 options->b_prefix = b;
1814 }
1815
1816 struct userdiff_driver *get_textconv(struct diff_filespec *one)
1817 {
1818 if (!DIFF_FILE_VALID(one))
1819 return NULL;
1820 if (!S_ISREG(one->mode))
1821 return NULL;
1822 diff_filespec_load_driver(one);
1823 if (!one->driver->textconv)
1824 return NULL;
1825
1826 if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
1827 struct notes_cache *c = xmalloc(sizeof(*c));
1828 struct strbuf name = STRBUF_INIT;
1829
1830 strbuf_addf(&name, "textconv/%s", one->driver->name);
1831 notes_cache_init(c, name.buf, one->driver->textconv);
1832 one->driver->textconv_cache = c;
1833 }
1834
1835 return one->driver;
1836 }
1837
1838 static void builtin_diff(const char *name_a,
1839 const char *name_b,
1840 struct diff_filespec *one,
1841 struct diff_filespec *two,
1842 const char *xfrm_msg,
1843 int must_show_header,
1844 struct diff_options *o,
1845 int complete_rewrite)
1846 {
1847 mmfile_t mf1, mf2;
1848 const char *lbl[2];
1849 char *a_one, *b_two;
1850 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1851 const char *reset = diff_get_color_opt(o, DIFF_RESET);
1852 const char *a_prefix, *b_prefix;
1853 struct userdiff_driver *textconv_one = NULL;
1854 struct userdiff_driver *textconv_two = NULL;
1855 struct strbuf header = STRBUF_INIT;
1856 struct strbuf *msgbuf;
1857 char *line_prefix = "";
1858
1859 if (o->output_prefix) {
1860 msgbuf = o->output_prefix(o, o->output_prefix_data);
1861 line_prefix = msgbuf->buf;
1862 }
1863
1864 if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
1865 (!one->mode || S_ISGITLINK(one->mode)) &&
1866 (!two->mode || S_ISGITLINK(two->mode))) {
1867 const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
1868 const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
1869 show_submodule_summary(o->file, one ? one->path : two->path,
1870 one->sha1, two->sha1, two->dirty_submodule,
1871 del, add, reset);
1872 return;
1873 }
1874
1875 if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
1876 textconv_one = get_textconv(one);
1877 textconv_two = get_textconv(two);
1878 }
1879
1880 diff_set_mnemonic_prefix(o, "a/", "b/");
1881 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
1882 a_prefix = o->b_prefix;
1883 b_prefix = o->a_prefix;
1884 } else {
1885 a_prefix = o->a_prefix;
1886 b_prefix = o->b_prefix;
1887 }
1888
1889 /* Never use a non-valid filename anywhere if at all possible */
1890 name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
1891 name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
1892
1893 a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
1894 b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
1895 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1896 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
1897 strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
1898 if (lbl[0][0] == '/') {
1899 /* /dev/null */
1900 strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
1901 if (xfrm_msg)
1902 strbuf_addstr(&header, xfrm_msg);
1903 must_show_header = 1;
1904 }
1905 else if (lbl[1][0] == '/') {
1906 strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
1907 if (xfrm_msg)
1908 strbuf_addstr(&header, xfrm_msg);
1909 must_show_header = 1;
1910 }
1911 else {
1912 if (one->mode != two->mode) {
1913 strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
1914 strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
1915 must_show_header = 1;
1916 }
1917 if (xfrm_msg)
1918 strbuf_addstr(&header, xfrm_msg);
1919
1920 /*
1921 * we do not run diff between different kind
1922 * of objects.
1923 */
1924 if ((one->mode ^ two->mode) & S_IFMT)
1925 goto free_ab_and_return;
1926 if (complete_rewrite &&
1927 (textconv_one || !diff_filespec_is_binary(one)) &&
1928 (textconv_two || !diff_filespec_is_binary(two))) {
1929 fprintf(o->file, "%s", header.buf);
1930 strbuf_reset(&header);
1931 emit_rewrite_diff(name_a, name_b, one, two,
1932 textconv_one, textconv_two, o);
1933 o->found_changes = 1;
1934 goto free_ab_and_return;
1935 }
1936 }
1937
1938 if (!DIFF_OPT_TST(o, TEXT) &&
1939 ( (!textconv_one && diff_filespec_is_binary(one)) ||
1940 (!textconv_two && diff_filespec_is_binary(two)) )) {
1941 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1942 die("unable to read files to diff");
1943 /* Quite common confusing case */
1944 if (mf1.size == mf2.size &&
1945 !memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
1946 if (must_show_header)
1947 fprintf(o->file, "%s", header.buf);
1948 goto free_ab_and_return;
1949 }
1950 fprintf(o->file, "%s", header.buf);
1951 strbuf_reset(&header);
1952 if (DIFF_OPT_TST(o, BINARY))
1953 emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
1954 else
1955 fprintf(o->file, "%sBinary files %s and %s differ\n",
1956 line_prefix, lbl[0], lbl[1]);
1957 o->found_changes = 1;
1958 }
1959 else {
1960 /* Crazy xdl interfaces.. */
1961 const char *diffopts = getenv("GIT_DIFF_OPTS");
1962 xpparam_t xpp;
1963 xdemitconf_t xecfg;
1964 struct emit_callback ecbdata;
1965 const struct userdiff_funcname *pe;
1966
1967 if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
1968 fprintf(o->file, "%s", header.buf);
1969 strbuf_reset(&header);
1970 }
1971
1972 mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
1973 mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
1974
1975 pe = diff_funcname_pattern(one);
1976 if (!pe)
1977 pe = diff_funcname_pattern(two);
1978
1979 memset(&xpp, 0, sizeof(xpp));
1980 memset(&xecfg, 0, sizeof(xecfg));
1981 memset(&ecbdata, 0, sizeof(ecbdata));
1982 ecbdata.label_path = lbl;
1983 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1984 ecbdata.found_changesp = &o->found_changes;
1985 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
1986 if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
1987 check_blank_at_eof(&mf1, &mf2, &ecbdata);
1988 ecbdata.opt = o;
1989 ecbdata.header = header.len ? &header : NULL;
1990 xpp.flags = o->xdl_opts;
1991 xecfg.ctxlen = o->context;
1992 xecfg.interhunkctxlen = o->interhunkcontext;
1993 xecfg.flags = XDL_EMIT_FUNCNAMES;
1994 if (pe)
1995 xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
1996 if (!diffopts)
1997 ;
1998 else if (!prefixcmp(diffopts, "--unified="))
1999 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
2000 else if (!prefixcmp(diffopts, "-u"))
2001 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
2002 if (o->word_diff) {
2003 int i;
2004
2005 ecbdata.diff_words =
2006 xcalloc(1, sizeof(struct diff_words_data));
2007 ecbdata.diff_words->type = o->word_diff;
2008 ecbdata.diff_words->opt = o;
2009 if (!o->word_regex)
2010 o->word_regex = userdiff_word_regex(one);
2011 if (!o->word_regex)
2012 o->word_regex = userdiff_word_regex(two);
2013 if (!o->word_regex)
2014 o->word_regex = diff_word_regex_cfg;
2015 if (o->word_regex) {
2016 ecbdata.diff_words->word_regex = (regex_t *)
2017 xmalloc(sizeof(regex_t));
2018 if (regcomp(ecbdata.diff_words->word_regex,
2019 o->word_regex,
2020 REG_EXTENDED | REG_NEWLINE))
2021 die ("Invalid regular expression: %s",
2022 o->word_regex);
2023 }
2024 for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
2025 if (o->word_diff == diff_words_styles[i].type) {
2026 ecbdata.diff_words->style =
2027 &diff_words_styles[i];
2028 break;
2029 }
2030 }
2031 if (DIFF_OPT_TST(o, COLOR_DIFF)) {
2032 struct diff_words_style *st = ecbdata.diff_words->style;
2033 st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
2034 st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
2035 st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
2036 }
2037 }
2038 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
2039 &xpp, &xecfg);
2040 if (o->word_diff)
2041 free_diff_words_data(&ecbdata);
2042 if (textconv_one)
2043 free(mf1.ptr);
2044 if (textconv_two)
2045 free(mf2.ptr);
2046 xdiff_clear_find_func(&xecfg);
2047 }
2048
2049 free_ab_and_return:
2050 strbuf_release(&header);
2051 diff_free_filespec_data(one);
2052 diff_free_filespec_data(two);
2053 free(a_one);
2054 free(b_two);
2055 return;
2056 }
2057
2058 static void builtin_diffstat(const char *name_a, const char *name_b,
2059 struct diff_filespec *one,
2060 struct diff_filespec *two,
2061 struct diffstat_t *diffstat,
2062 struct diff_options *o,
2063 int complete_rewrite)
2064 {
2065 mmfile_t mf1, mf2;
2066 struct diffstat_file *data;
2067
2068 data = diffstat_add(diffstat, name_a, name_b);
2069
2070 if (!one || !two) {
2071 data->is_unmerged = 1;
2072 return;
2073 }
2074 if (complete_rewrite) {
2075 diff_populate_filespec(one, 0);
2076 diff_populate_filespec(two, 0);
2077 data->deleted = count_lines(one->data, one->size);
2078 data->added = count_lines(two->data, two->size);
2079 goto free_and_return;
2080 }
2081 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2082 die("unable to read files to diff");
2083
2084 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
2085 data->is_binary = 1;
2086 data->added = mf2.size;
2087 data->deleted = mf1.size;
2088 } else {
2089 /* Crazy xdl interfaces.. */
2090 xpparam_t xpp;
2091 xdemitconf_t xecfg;
2092
2093 memset(&xpp, 0, sizeof(xpp));
2094 memset(&xecfg, 0, sizeof(xecfg));
2095 xpp.flags = o->xdl_opts;
2096 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
2097 &xpp, &xecfg);
2098 }
2099
2100 free_and_return:
2101 diff_free_filespec_data(one);
2102 diff_free_filespec_data(two);
2103 }
2104
2105 static void builtin_checkdiff(const char *name_a, const char *name_b,
2106 const char *attr_path,
2107 struct diff_filespec *one,
2108 struct diff_filespec *two,
2109 struct diff_options *o)
2110 {
2111 mmfile_t mf1, mf2;
2112 struct checkdiff_t data;
2113
2114 if (!two)
2115 return;
2116
2117 memset(&data, 0, sizeof(data));
2118 data.filename = name_b ? name_b : name_a;
2119 data.lineno = 0;
2120 data.o = o;
2121 data.ws_rule = whitespace_rule(attr_path);
2122 data.conflict_marker_size = ll_merge_marker_size(attr_path);
2123
2124 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
2125 die("unable to read files to diff");
2126
2127 /*
2128 * All the other codepaths check both sides, but not checking
2129 * the "old" side here is deliberate. We are checking the newly
2130 * introduced changes, and as long as the "new" side is text, we
2131 * can and should check what it introduces.
2132 */
2133 if (diff_filespec_is_binary(two))
2134 goto free_and_return;
2135 else {
2136 /* Crazy xdl interfaces.. */
2137 xpparam_t xpp;
2138 xdemitconf_t xecfg;
2139
2140 memset(&xpp, 0, sizeof(xpp));
2141 memset(&xecfg, 0, sizeof(xecfg));
2142 xecfg.ctxlen = 1; /* at least one context line */
2143 xpp.flags = 0;
2144 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
2145 &xpp, &xecfg);
2146
2147 if (data.ws_rule & WS_BLANK_AT_EOF) {
2148 struct emit_callback ecbdata;
2149 int blank_at_eof;
2150
2151 ecbdata.ws_rule = data.ws_rule;
2152 check_blank_at_eof(&mf1, &mf2, &ecbdata);
2153 blank_at_eof = ecbdata.blank_at_eof_in_preimage;
2154
2155 if (blank_at_eof) {
2156 static char *err;
2157 if (!err)
2158 err = whitespace_error_string(WS_BLANK_AT_EOF);
2159 fprintf(o->file, "%s:%d: %s.\n",
2160 data.filename, blank_at_eof, err);
2161 data.status = 1; /* report errors */
2162 }
2163 }
2164 }
2165 free_and_return:
2166 diff_free_filespec_data(one);
2167 diff_free_filespec_data(two);
2168 if (data.status)
2169 DIFF_OPT_SET(o, CHECK_FAILED);
2170 }
2171
2172 struct diff_filespec *alloc_filespec(const char *path)
2173 {
2174 int namelen = strlen(path);
2175 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
2176
2177 memset(spec, 0, sizeof(*spec));
2178 spec->path = (char *)(spec + 1);
2179 memcpy(spec->path, path, namelen+1);
2180 spec->count = 1;
2181 spec->is_binary = -1;
2182 return spec;
2183 }
2184
2185 void free_filespec(struct diff_filespec *spec)
2186 {
2187 if (!--spec->count) {
2188 diff_free_filespec_data(spec);
2189 free(spec);
2190 }
2191 }
2192
2193 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
2194 unsigned short mode)
2195 {
2196 if (mode) {
2197 spec->mode = canon_mode(mode);
2198 hashcpy(spec->sha1, sha1);
2199 spec->sha1_valid = !is_null_sha1(sha1);
2200 }
2201 }
2202
2203 /*
2204 * Given a name and sha1 pair, if the index tells us the file in
2205 * the work tree has that object contents, return true, so that
2206 * prepare_temp_file() does not have to inflate and extract.
2207 */
2208 static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
2209 {
2210 struct cache_entry *ce;
2211 struct stat st;
2212 int pos, len;
2213
2214 /*
2215 * We do not read the cache ourselves here, because the
2216 * benchmark with my previous version that always reads cache
2217 * shows that it makes things worse for diff-tree comparing
2218 * two linux-2.6 kernel trees in an already checked out work
2219 * tree. This is because most diff-tree comparisons deal with
2220 * only a small number of files, while reading the cache is
2221 * expensive for a large project, and its cost outweighs the
2222 * savings we get by not inflating the object to a temporary
2223 * file. Practically, this code only helps when we are used
2224 * by diff-cache --cached, which does read the cache before
2225 * calling us.
2226 */
2227 if (!active_cache)
2228 return 0;
2229
2230 /* We want to avoid the working directory if our caller
2231 * doesn't need the data in a normal file, this system
2232 * is rather slow with its stat/open/mmap/close syscalls,
2233 * and the object is contained in a pack file. The pack
2234 * is probably already open and will be faster to obtain
2235 * the data through than the working directory. Loose
2236 * objects however would tend to be slower as they need
2237 * to be individually opened and inflated.
2238 */
2239 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
2240 return 0;
2241
2242 len = strlen(name);
2243 pos = cache_name_pos(name, len);
2244 if (pos < 0)
2245 return 0;
2246 ce = active_cache[pos];
2247
2248 /*
2249 * This is not the sha1 we are looking for, or
2250 * unreusable because it is not a regular file.
2251 */
2252 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
2253 return 0;
2254
2255 /*
2256 * If ce is marked as "assume unchanged", there is no
2257 * guarantee that work tree matches what we are looking for.
2258 */
2259 if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
2260 return 0;
2261
2262 /*
2263 * If ce matches the file in the work tree, we can reuse it.
2264 */
2265 if (ce_uptodate(ce) ||
2266 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
2267 return 1;
2268
2269 return 0;
2270 }
2271
2272 static int populate_from_stdin(struct diff_filespec *s)
2273 {
2274 struct strbuf buf = STRBUF_INIT;
2275 size_t size = 0;
2276
2277 if (strbuf_read(&buf, 0, 0) < 0)
2278 return error("error while reading from stdin %s",
2279 strerror(errno));
2280
2281 s->should_munmap = 0;
2282 s->data = strbuf_detach(&buf, &size);
2283 s->size = size;
2284 s->should_free = 1;
2285 return 0;
2286 }
2287
2288 static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
2289 {
2290 int len;
2291 char *data = xmalloc(100), *dirty = "";
2292
2293 /* Are we looking at the work tree? */
2294 if (s->dirty_submodule)
2295 dirty = "-dirty";
2296
2297 len = snprintf(data, 100,
2298 "Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
2299 s->data = data;
2300 s->size = len;
2301 s->should_free = 1;
2302 if (size_only) {
2303 s->data = NULL;
2304 free(data);
2305 }
2306 return 0;
2307 }
2308
2309 /*
2310 * While doing rename detection and pickaxe operation, we may need to
2311 * grab the data for the blob (or file) for our own in-core comparison.
2312 * diff_filespec has data and size fields for this purpose.
2313 */
2314 int diff_populate_filespec(struct diff_filespec *s, int size_only)
2315 {
2316 int err = 0;
2317 if (!DIFF_FILE_VALID(s))
2318 die("internal error: asking to populate invalid file.");
2319 if (S_ISDIR(s->mode))
2320 return -1;
2321
2322 if (s->data)
2323 return 0;
2324
2325 if (size_only && 0 < s->size)
2326 return 0;
2327
2328 if (S_ISGITLINK(s->mode))
2329 return diff_populate_gitlink(s, size_only);
2330
2331 if (!s->sha1_valid ||
2332 reuse_worktree_file(s->path, s->sha1, 0)) {
2333 struct strbuf buf = STRBUF_INIT;
2334 struct stat st;
2335 int fd;
2336
2337 if (!strcmp(s->path, "-"))
2338 return populate_from_stdin(s);
2339
2340 if (lstat(s->path, &st) < 0) {
2341 if (errno == ENOENT) {
2342 err_empty:
2343 err = -1;
2344 empty:
2345 s->data = (char *)"";
2346 s->size = 0;
2347 return err;
2348 }
2349 }
2350 s->size = xsize_t(st.st_size);
2351 if (!s->size)
2352 goto empty;
2353 if (S_ISLNK(st.st_mode)) {
2354 struct strbuf sb = STRBUF_INIT;
2355
2356 if (strbuf_readlink(&sb, s->path, s->size))
2357 goto err_empty;
2358 s->size = sb.len;
2359 s->data = strbuf_detach(&sb, NULL);
2360 s->should_free = 1;
2361 return 0;
2362 }
2363 if (size_only)
2364 return 0;
2365 fd = open(s->path, O_RDONLY);
2366 if (fd < 0)
2367 goto err_empty;
2368 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
2369 close(fd);
2370 s->should_munmap = 1;
2371
2372 /*
2373 * Convert from working tree format to canonical git format
2374 */
2375 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
2376 size_t size = 0;
2377 munmap(s->data, s->size);
2378 s->should_munmap = 0;
2379 s->data = strbuf_detach(&buf, &size);
2380 s->size = size;
2381 s->should_free = 1;
2382 }
2383 }
2384 else {
2385 enum object_type type;
2386 if (size_only)
2387 type = sha1_object_info(s->sha1, &s->size);
2388 else {
2389 s->data = read_sha1_file(s->sha1, &type, &s->size);
2390 s->should_free = 1;
2391 }
2392 }
2393 return 0;
2394 }
2395
2396 void diff_free_filespec_blob(struct diff_filespec *s)
2397 {
2398 if (s->should_free)
2399 free(s->data);
2400 else if (s->should_munmap)
2401 munmap(s->data, s->size);
2402
2403 if (s->should_free || s->should_munmap) {
2404 s->should_free = s->should_munmap = 0;
2405 s->data = NULL;
2406 }
2407 }
2408
2409 void diff_free_filespec_data(struct diff_filespec *s)
2410 {
2411 diff_free_filespec_blob(s);
2412 free(s->cnt_data);
2413 s->cnt_data = NULL;
2414 }
2415
2416 static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
2417 void *blob,
2418 unsigned long size,
2419 const unsigned char *sha1,
2420 int mode)
2421 {
2422 int fd;
2423 struct strbuf buf = STRBUF_INIT;
2424 struct strbuf template = STRBUF_INIT;
2425 char *path_dup = xstrdup(path);
2426 const char *base = basename(path_dup);
2427
2428 /* Generate "XXXXXX_basename.ext" */
2429 strbuf_addstr(&template, "XXXXXX_");
2430 strbuf_addstr(&template, base);
2431
2432 fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
2433 strlen(base) + 1);
2434 if (fd < 0)
2435 die_errno("unable to create temp-file");
2436 if (convert_to_working_tree(path,
2437 (const char *)blob, (size_t)size, &buf)) {
2438 blob = buf.buf;
2439 size = buf.len;
2440 }
2441 if (write_in_full(fd, blob, size) != size)
2442 die_errno("unable to write temp-file");
2443 close(fd);
2444 temp->name = temp->tmp_path;
2445 strcpy(temp->hex, sha1_to_hex(sha1));
2446 temp->hex[40] = 0;
2447 sprintf(temp->mode, "%06o", mode);
2448 strbuf_release(&buf);
2449 strbuf_release(&template);
2450 free(path_dup);
2451 }
2452
2453 static struct diff_tempfile *prepare_temp_file(const char *name,
2454 struct diff_filespec *one)
2455 {
2456 struct diff_tempfile *temp = claim_diff_tempfile();
2457
2458 if (!DIFF_FILE_VALID(one)) {
2459 not_a_valid_file:
2460 /* A '-' entry produces this for file-2, and
2461 * a '+' entry produces this for file-1.
2462 */
2463 temp->name = "/dev/null";
2464 strcpy(temp->hex, ".");
2465 strcpy(temp->mode, ".");
2466 return temp;
2467 }
2468
2469 if (!remove_tempfile_installed) {
2470 atexit(remove_tempfile);
2471 sigchain_push_common(remove_tempfile_on_signal);
2472 remove_tempfile_installed = 1;
2473 }
2474
2475 if (!one->sha1_valid ||
2476 reuse_worktree_file(name, one->sha1, 1)) {
2477 struct stat st;
2478 if (lstat(name, &st) < 0) {
2479 if (errno == ENOENT)
2480 goto not_a_valid_file;
2481 die_errno("stat(%s)", name);
2482 }
2483 if (S_ISLNK(st.st_mode)) {
2484 struct strbuf sb = STRBUF_INIT;
2485 if (strbuf_readlink(&sb, name, st.st_size) < 0)
2486 die_errno("readlink(%s)", name);
2487 prep_temp_blob(name, temp, sb.buf, sb.len,
2488 (one->sha1_valid ?
2489 one->sha1 : null_sha1),
2490 (one->sha1_valid ?
2491 one->mode : S_IFLNK));
2492 strbuf_release(&sb);
2493 }
2494 else {
2495 /* we can borrow from the file in the work tree */
2496 temp->name = name;
2497 if (!one->sha1_valid)
2498 strcpy(temp->hex, sha1_to_hex(null_sha1));
2499 else
2500 strcpy(temp->hex, sha1_to_hex(one->sha1));
2501 /* Even though we may sometimes borrow the
2502 * contents from the work tree, we always want
2503 * one->mode. mode is trustworthy even when
2504 * !(one->sha1_valid), as long as
2505 * DIFF_FILE_VALID(one).
2506 */
2507 sprintf(temp->mode, "%06o", one->mode);
2508 }
2509 return temp;
2510 }
2511 else {
2512 if (diff_populate_filespec(one, 0))
2513 die("cannot read data blob for %s", one->path);
2514 prep_temp_blob(name, temp, one->data, one->size,
2515 one->sha1, one->mode);
2516 }
2517 return temp;
2518 }
2519
2520 /* An external diff command takes:
2521 *
2522 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2523 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2524 *
2525 */
2526 static void run_external_diff(const char *pgm,
2527 const char *name,
2528 const char *other,
2529 struct diff_filespec *one,
2530 struct diff_filespec *two,
2531 const char *xfrm_msg,
2532 int complete_rewrite)
2533 {
2534 const char *spawn_arg[10];
2535 int retval;
2536 const char **arg = &spawn_arg[0];
2537
2538 if (one && two) {
2539 struct diff_tempfile *temp_one, *temp_two;
2540 const char *othername = (other ? other : name);
2541 temp_one = prepare_temp_file(name, one);
2542 temp_two = prepare_temp_file(othername, two);
2543 *arg++ = pgm;
2544 *arg++ = name;
2545 *arg++ = temp_one->name;
2546 *arg++ = temp_one->hex;
2547 *arg++ = temp_one->mode;
2548 *arg++ = temp_two->name;
2549 *arg++ = temp_two->hex;
2550 *arg++ = temp_two->mode;
2551 if (other) {
2552 *arg++ = other;
2553 *arg++ = xfrm_msg;
2554 }
2555 } else {
2556 *arg++ = pgm;
2557 *arg++ = name;
2558 }
2559 *arg = NULL;
2560 fflush(NULL);
2561 retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
2562 remove_tempfile();
2563 if (retval) {
2564 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2565 exit(1);
2566 }
2567 }
2568
2569 static int similarity_index(struct diff_filepair *p)
2570 {
2571 return p->score * 100 / MAX_SCORE;
2572 }
2573
2574 static void fill_metainfo(struct strbuf *msg,
2575 const char *name,
2576 const char *other,
2577 struct diff_filespec *one,
2578 struct diff_filespec *two,
2579 struct diff_options *o,
2580 struct diff_filepair *p,
2581 int *must_show_header,
2582 int use_color)
2583 {
2584 const char *set = diff_get_color(use_color, DIFF_METAINFO);
2585 const char *reset = diff_get_color(use_color, DIFF_RESET);
2586 struct strbuf *msgbuf;
2587 char *line_prefix = "";
2588
2589 *must_show_header = 1;
2590 if (o->output_prefix) {
2591 msgbuf = o->output_prefix(o, o->output_prefix_data);
2592 line_prefix = msgbuf->buf;
2593 }
2594 strbuf_init(msg, PATH_MAX * 2 + 300);
2595 switch (p->status) {
2596 case DIFF_STATUS_COPIED:
2597 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2598 line_prefix, set, similarity_index(p));
2599 strbuf_addf(msg, "%s\n%s%scopy from ",
2600 reset, line_prefix, set);
2601 quote_c_style(name, msg, NULL, 0);
2602 strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
2603 quote_c_style(other, msg, NULL, 0);
2604 strbuf_addf(msg, "%s\n", reset);
2605 break;
2606 case DIFF_STATUS_RENAMED:
2607 strbuf_addf(msg, "%s%ssimilarity index %d%%",
2608 line_prefix, set, similarity_index(p));
2609 strbuf_addf(msg, "%s\n%s%srename from ",
2610 reset, line_prefix, set);
2611 quote_c_style(name, msg, NULL, 0);
2612 strbuf_addf(msg, "%s\n%s%srename to ",
2613 reset, line_prefix, set);
2614 quote_c_style(other, msg, NULL, 0);
2615 strbuf_addf(msg, "%s\n", reset);
2616 break;
2617 case DIFF_STATUS_MODIFIED:
2618 if (p->score) {
2619 strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
2620 line_prefix,
2621 set, similarity_index(p), reset);
2622 break;
2623 }
2624 /* fallthru */
2625 default:
2626 *must_show_header = 0;
2627 }
2628 if (one && two && hashcmp(one->sha1, two->sha1)) {
2629 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
2630
2631 if (DIFF_OPT_TST(o, BINARY)) {
2632 mmfile_t mf;
2633 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2634 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
2635 abbrev = 40;
2636 }
2637 strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
2638 find_unique_abbrev(one->sha1, abbrev));
2639 strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
2640 if (one->mode == two->mode)
2641 strbuf_addf(msg, " %06o", one->mode);
2642 strbuf_addf(msg, "%s\n", reset);
2643 }
2644 }
2645
2646 static void run_diff_cmd(const char *pgm,
2647 const char *name,
2648 const char *other,
2649 const char *attr_path,
2650 struct diff_filespec *one,
2651 struct diff_filespec *two,
2652 struct strbuf *msg,
2653 struct diff_options *o,
2654 struct diff_filepair *p)
2655 {
2656 const char *xfrm_msg = NULL;
2657 int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
2658 int must_show_header = 0;
2659
2660 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
2661 pgm = NULL;
2662 else {
2663 struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
2664 if (drv && drv->external)
2665 pgm = drv->external;
2666 }
2667
2668 if (msg) {
2669 /*
2670 * don't use colors when the header is intended for an
2671 * external diff driver
2672 */
2673 fill_metainfo(msg, name, other, one, two, o, p,
2674 &must_show_header,
2675 DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
2676 xfrm_msg = msg->len ? msg->buf : NULL;
2677 }
2678
2679 if (pgm) {
2680 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2681 complete_rewrite);
2682 return;
2683 }
2684 if (one && two)
2685 builtin_diff(name, other ? other : name,
2686 one, two, xfrm_msg, must_show_header,
2687 o, complete_rewrite);
2688 else
2689 fprintf(o->file, "* Unmerged path %s\n", name);
2690 }
2691
2692 static void diff_fill_sha1_info(struct diff_filespec *one)
2693 {
2694 if (DIFF_FILE_VALID(one)) {
2695 if (!one->sha1_valid) {
2696 struct stat st;
2697 if (!strcmp(one->path, "-")) {
2698 hashcpy(one->sha1, null_sha1);
2699 return;
2700 }
2701 if (lstat(one->path, &st) < 0)
2702 die_errno("stat '%s'", one->path);
2703 if (index_path(one->sha1, one->path, &st, 0))
2704 die("cannot hash %s", one->path);
2705 }
2706 }
2707 else
2708 hashclr(one->sha1);
2709 }
2710
2711 static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2712 {
2713 /* Strip the prefix but do not molest /dev/null and absolute paths */
2714 if (*namep && **namep != '/')
2715 *namep += prefix_length;
2716 if (*otherp && **otherp != '/')
2717 *otherp += prefix_length;
2718 }
2719
2720 static void run_diff(struct diff_filepair *p, struct diff_options *o)
2721 {
2722 const char *pgm = external_diff();
2723 struct strbuf msg;
2724 struct diff_filespec *one = p->one;
2725 struct diff_filespec *two = p->two;
2726 const char *name;
2727 const char *other;
2728 const char *attr_path;
2729
2730 name = p->one->path;
2731 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2732 attr_path = name;
2733 if (o->prefix_length)
2734 strip_prefix(o->prefix_length, &name, &other);
2735
2736 if (DIFF_PAIR_UNMERGED(p)) {
2737 run_diff_cmd(pgm, name, NULL, attr_path,
2738 NULL, NULL, NULL, o, p);
2739 return;
2740 }
2741
2742 diff_fill_sha1_info(one);
2743 diff_fill_sha1_info(two);
2744
2745 if (!pgm &&
2746 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2747 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2748 /*
2749 * a filepair that changes between file and symlink
2750 * needs to be split into deletion and creation.
2751 */
2752 struct diff_filespec *null = alloc_filespec(two->path);
2753 run_diff_cmd(NULL, name, other, attr_path,
2754 one, null, &msg, o, p);
2755 free(null);
2756 strbuf_release(&msg);
2757
2758 null = alloc_filespec(one->path);
2759 run_diff_cmd(NULL, name, other, attr_path,
2760 null, two, &msg, o, p);
2761 free(null);
2762 }
2763 else
2764 run_diff_cmd(pgm, name, other, attr_path,
2765 one, two, &msg, o, p);
2766
2767 strbuf_release(&msg);
2768 }
2769
2770 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2771 struct diffstat_t *diffstat)
2772 {
2773 const char *name;
2774 const char *other;
2775 int complete_rewrite = 0;
2776
2777 if (DIFF_PAIR_UNMERGED(p)) {
2778 /* unmerged */
2779 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
2780 return;
2781 }
2782
2783 name = p->one->path;
2784 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2785
2786 if (o->prefix_length)
2787 strip_prefix(o->prefix_length, &name, &other);
2788
2789 diff_fill_sha1_info(p->one);
2790 diff_fill_sha1_info(p->two);
2791
2792 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2793 complete_rewrite = 1;
2794 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
2795 }
2796
2797 static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2798 {
2799 const char *name;
2800 const char *other;
2801 const char *attr_path;
2802
2803 if (DIFF_PAIR_UNMERGED(p)) {
2804 /* unmerged */
2805 return;
2806 }
2807
2808 name = p->one->path;
2809 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2810 attr_path = other ? other : name;
2811
2812 if (o->prefix_length)
2813 strip_prefix(o->prefix_length, &name, &other);
2814
2815 diff_fill_sha1_info(p->one);
2816 diff_fill_sha1_info(p->two);
2817
2818 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
2819 }
2820
2821 void diff_setup(struct diff_options *options)
2822 {
2823 memcpy(options, &default_diff_options, sizeof(*options));
2824 memset(&diff_queued_diff, 0, sizeof(diff_queued_diff));
2825
2826 options->file = stdout;
2827
2828 options->line_termination = '\n';
2829 options->break_opt = -1;
2830 options->rename_limit = -1;
2831 options->dirstat_percent = 3;
2832 options->context = 3;
2833
2834 options->change = diff_change;
2835 options->add_remove = diff_addremove;
2836 if (diff_use_color_default > 0)
2837 DIFF_OPT_SET(options, COLOR_DIFF);
2838 options->detect_rename = diff_detect_rename_default;
2839
2840 if (diff_no_prefix) {
2841 options->a_prefix = options->b_prefix = "";
2842 } else if (!diff_mnemonic_prefix) {
2843 options->a_prefix = "a/";
2844 options->b_prefix = "b/";
2845 }
2846 }
2847
2848 int diff_setup_done(struct diff_options *options)
2849 {
2850 int count = 0;
2851
2852 if (options->output_format & DIFF_FORMAT_NAME)
2853 count++;
2854 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2855 count++;
2856 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2857 count++;
2858 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2859 count++;
2860 if (count > 1)
2861 die("--name-only, --name-status, --check and -s are mutually exclusive");
2862
2863 /*
2864 * Most of the time we can say "there are changes"
2865 * only by checking if there are changed paths, but
2866 * --ignore-whitespace* options force us to look
2867 * inside contents.
2868 */
2869
2870 if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
2871 DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
2872 DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
2873 DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
2874 else
2875 DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
2876
2877 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
2878 options->detect_rename = DIFF_DETECT_COPY;
2879
2880 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2881 options->prefix = NULL;
2882 if (options->prefix)
2883 options->prefix_length = strlen(options->prefix);
2884 else
2885 options->prefix_length = 0;
2886
2887 if (options->output_format & (DIFF_FORMAT_NAME |
2888 DIFF_FORMAT_NAME_STATUS |
2889 DIFF_FORMAT_CHECKDIFF |
2890 DIFF_FORMAT_NO_OUTPUT))
2891 options->output_format &= ~(DIFF_FORMAT_RAW |
2892 DIFF_FORMAT_NUMSTAT |
2893 DIFF_FORMAT_DIFFSTAT |
2894 DIFF_FORMAT_SHORTSTAT |
2895 DIFF_FORMAT_DIRSTAT |
2896 DIFF_FORMAT_SUMMARY |
2897 DIFF_FORMAT_PATCH);
2898
2899 /*
2900 * These cases always need recursive; we do not drop caller-supplied
2901 * recursive bits for other formats here.
2902 */
2903 if (options->output_format & (DIFF_FORMAT_PATCH |
2904 DIFF_FORMAT_NUMSTAT |
2905 DIFF_FORMAT_DIFFSTAT |
2906 DIFF_FORMAT_SHORTSTAT |
2907 DIFF_FORMAT_DIRSTAT |
2908 DIFF_FORMAT_SUMMARY |
2909 DIFF_FORMAT_CHECKDIFF))
2910 DIFF_OPT_SET(options, RECURSIVE);
2911 /*
2912 * Also pickaxe would not work very well if you do not say recursive
2913 */
2914 if (options->pickaxe)
2915 DIFF_OPT_SET(options, RECURSIVE);
2916 /*
2917 * When patches are generated, submodules diffed against the work tree
2918 * must be checked for dirtiness too so it can be shown in the output
2919 */
2920 if (options->output_format & DIFF_FORMAT_PATCH)
2921 DIFF_OPT_SET(options, DIRTY_SUBMODULES);
2922
2923 if (options->detect_rename && options->rename_limit < 0)
2924 options->rename_limit = diff_rename_limit_default;
2925 if (options->setup & DIFF_SETUP_USE_CACHE) {
2926 if (!active_cache)
2927 /* read-cache does not die even when it fails
2928 * so it is safe for us to do this here. Also
2929 * it does not smudge active_cache or active_nr
2930 * when it fails, so we do not have to worry about
2931 * cleaning it up ourselves either.
2932 */
2933 read_cache();
2934 }
2935 if (options->abbrev <= 0 || 40 < options->abbrev)
2936 options->abbrev = 40; /* full */
2937
2938 /*
2939 * It does not make sense to show the first hit we happened
2940 * to have found. It does not make sense not to return with
2941 * exit code in such a case either.
2942 */
2943 if (DIFF_OPT_TST(options, QUICK)) {
2944 options->output_format = DIFF_FORMAT_NO_OUTPUT;
2945 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
2946 }
2947
2948 return 0;
2949 }
2950
2951 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
2952 {
2953 char c, *eq;
2954 int len;
2955
2956 if (*arg != '-')
2957 return 0;
2958 c = *++arg;
2959 if (!c)
2960 return 0;
2961 if (c == arg_short) {
2962 c = *++arg;
2963 if (!c)
2964 return 1;
2965 if (val && isdigit(c)) {
2966 char *end;
2967 int n = strtoul(arg, &end, 10);
2968 if (*end)
2969 return 0;
2970 *val = n;
2971 return 1;
2972 }
2973 return 0;
2974 }
2975 if (c != '-')
2976 return 0;
2977 arg++;
2978 eq = strchr(arg, '=');
2979 if (eq)
2980 len = eq - arg;
2981 else
2982 len = strlen(arg);
2983 if (!len || strncmp(arg, arg_long, len))
2984 return 0;
2985 if (eq) {
2986 int n;
2987 char *end;
2988 if (!isdigit(*++eq))
2989 return 0;
2990 n = strtoul(eq, &end, 10);
2991 if (*end)
2992 return 0;
2993 *val = n;
2994 }
2995 return 1;
2996 }
2997
2998 static int diff_scoreopt_parse(const char *opt);
2999
3000 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
3001 {
3002 const char *arg = av[0];
3003
3004 /* Output format options */
3005 if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
3006 options->output_format |= DIFF_FORMAT_PATCH;
3007 else if (opt_arg(arg, 'U', "unified", &options->context))
3008 options->output_format |= DIFF_FORMAT_PATCH;
3009 else if (!strcmp(arg, "--raw"))
3010 options->output_format |= DIFF_FORMAT_RAW;
3011 else if (!strcmp(arg, "--patch-with-raw"))
3012 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
3013 else if (!strcmp(arg, "--numstat"))
3014 options->output_format |= DIFF_FORMAT_NUMSTAT;
3015 else if (!strcmp(arg, "--shortstat"))
3016 options->output_format |= DIFF_FORMAT_SHORTSTAT;
3017 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
3018 options->output_format |= DIFF_FORMAT_DIRSTAT;
3019 else if (!strcmp(arg, "--cumulative")) {
3020 options->output_format |= DIFF_FORMAT_DIRSTAT;
3021 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
3022 } else if (opt_arg(arg, 0, "dirstat-by-file",
3023 &options->dirstat_percent)) {
3024 options->output_format |= DIFF_FORMAT_DIRSTAT;
3025 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
3026 }
3027 else if (!strcmp(arg, "--check"))
3028 options->output_format |= DIFF_FORMAT_CHECKDIFF;
3029 else if (!strcmp(arg, "--summary"))
3030 options->output_format |= DIFF_FORMAT_SUMMARY;
3031 else if (!strcmp(arg, "--patch-with-stat"))
3032 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
3033 else if (!strcmp(arg, "--name-only"))
3034 options->output_format |= DIFF_FORMAT_NAME;
3035 else if (!strcmp(arg, "--name-status"))
3036 options->output_format |= DIFF_FORMAT_NAME_STATUS;
3037 else if (!strcmp(arg, "-s"))
3038 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
3039 else if (!prefixcmp(arg, "--stat")) {
3040 char *end;
3041 int width = options->stat_width;
3042 int name_width = options->stat_name_width;
3043 arg += 6;
3044 end = (char *)arg;
3045
3046 switch (*arg) {
3047 case '-':
3048 if (!prefixcmp(arg, "-width="))
3049 width = strtoul(arg + 7, &end, 10);
3050 else if (!prefixcmp(arg, "-name-width="))
3051 name_width = strtoul(arg + 12, &end, 10);
3052 break;
3053 case '=':
3054 width = strtoul(arg+1, &end, 10);
3055 if (*end == ',')
3056 name_width = strtoul(end+1, &end, 10);
3057 }
3058
3059 /* Important! This checks all the error cases! */
3060 if (*end)
3061 return 0;
3062 options->output_format |= DIFF_FORMAT_DIFFSTAT;
3063 options->stat_name_width = name_width;
3064 options->stat_width = width;
3065 }
3066
3067 /* renames options */
3068 else if (!prefixcmp(arg, "-B")) {
3069 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
3070 return -1;
3071 }
3072 else if (!prefixcmp(arg, "-M")) {
3073 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3074 return -1;
3075 options->detect_rename = DIFF_DETECT_RENAME;
3076 }
3077 else if (!prefixcmp(arg, "-C")) {
3078 if (options->detect_rename == DIFF_DETECT_COPY)
3079 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3080 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
3081 return -1;
3082 options->detect_rename = DIFF_DETECT_COPY;
3083 }
3084 else if (!strcmp(arg, "--no-renames"))
3085 options->detect_rename = 0;
3086 else if (!strcmp(arg, "--relative"))
3087 DIFF_OPT_SET(options, RELATIVE_NAME);
3088 else if (!prefixcmp(arg, "--relative=")) {
3089 DIFF_OPT_SET(options, RELATIVE_NAME);
3090 options->prefix = arg + 11;
3091 }
3092
3093 /* xdiff options */
3094 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
3095 DIFF_XDL_SET(options, IGNORE_WHITESPACE);
3096 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
3097 DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
3098 else if (!strcmp(arg, "--ignore-space-at-eol"))
3099 DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
3100 else if (!strcmp(arg, "--patience"))
3101 DIFF_XDL_SET(options, PATIENCE_DIFF);
3102
3103 /* flags options */
3104 else if (!strcmp(arg, "--binary")) {
3105 options->output_format |= DIFF_FORMAT_PATCH;
3106 DIFF_OPT_SET(options, BINARY);
3107 }
3108 else if (!strcmp(arg, "--full-index"))
3109 DIFF_OPT_SET(options, FULL_INDEX);
3110 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
3111 DIFF_OPT_SET(options, TEXT);
3112 else if (!strcmp(arg, "-R"))
3113 DIFF_OPT_SET(options, REVERSE_DIFF);
3114 else if (!strcmp(arg, "--find-copies-harder"))
3115 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
3116 else if (!strcmp(arg, "--follow"))
3117 DIFF_OPT_SET(options, FOLLOW_RENAMES);
3118 else if (!strcmp(arg, "--color"))
3119 DIFF_OPT_SET(options, COLOR_DIFF);
3120 else if (!prefixcmp(arg, "--color=")) {
3121 int value = git_config_colorbool(NULL, arg+8, -1);
3122 if (value == 0)
3123 DIFF_OPT_CLR(options, COLOR_DIFF);
3124 else if (value > 0)
3125 DIFF_OPT_SET(options, COLOR_DIFF);
3126 else
3127 return error("option `color' expects \"always\", \"auto\", or \"never\"");
3128 }
3129 else if (!strcmp(arg, "--no-color"))
3130 DIFF_OPT_CLR(options, COLOR_DIFF);
3131 else if (!strcmp(arg, "--color-words")) {
3132 DIFF_OPT_SET(options, COLOR_DIFF);
3133 options->word_diff = DIFF_WORDS_COLOR;
3134 }
3135 else if (!prefixcmp(arg, "--color-words=")) {
3136 DIFF_OPT_SET(options, COLOR_DIFF);
3137 options->word_diff = DIFF_WORDS_COLOR;
3138 options->word_regex = arg + 14;
3139 }
3140 else if (!strcmp(arg, "--word-diff")) {
3141 if (options->word_diff == DIFF_WORDS_NONE)
3142 options->word_diff = DIFF_WORDS_PLAIN;
3143 }
3144 else if (!prefixcmp(arg, "--word-diff=")) {
3145 const char *type = arg + 12;
3146 if (!strcmp(type, "plain"))
3147 options->word_diff = DIFF_WORDS_PLAIN;
3148 else if (!strcmp(type, "color")) {
3149 DIFF_OPT_SET(options, COLOR_DIFF);
3150 options->word_diff = DIFF_WORDS_COLOR;
3151 }
3152 else if (!strcmp(type, "porcelain"))
3153 options->word_diff = DIFF_WORDS_PORCELAIN;
3154 else if (!strcmp(type, "none"))
3155 options->word_diff = DIFF_WORDS_NONE;
3156 else
3157 die("bad --word-diff argument: %s", type);
3158 }
3159 else if (!prefixcmp(arg, "--word-diff-regex=")) {
3160 if (options->word_diff == DIFF_WORDS_NONE)
3161 options->word_diff = DIFF_WORDS_PLAIN;
3162 options->word_regex = arg + 18;
3163 }
3164 else if (!strcmp(arg, "--exit-code"))
3165 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
3166 else if (!strcmp(arg, "--quiet"))
3167 DIFF_OPT_SET(options, QUICK);
3168 else if (!strcmp(arg, "--ext-diff"))
3169 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
3170 else if (!strcmp(arg, "--no-ext-diff"))
3171 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
3172 else if (!strcmp(arg, "--textconv"))
3173 DIFF_OPT_SET(options, ALLOW_TEXTCONV);
3174 else if (!strcmp(arg, "--no-textconv"))
3175 DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
3176 else if (!strcmp(arg, "--ignore-submodules")) {
3177 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3178 handle_ignore_submodules_arg(options, "all");
3179 } else if (!prefixcmp(arg, "--ignore-submodules=")) {
3180 DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
3181 handle_ignore_submodules_arg(options, arg + 20);
3182 } else if (!strcmp(arg, "--submodule"))
3183 DIFF_OPT_SET(options, SUBMODULE_LOG);
3184 else if (!prefixcmp(arg, "--submodule=")) {
3185 if (!strcmp(arg + 12, "log"))
3186 DIFF_OPT_SET(options, SUBMODULE_LOG);
3187 }
3188
3189 /* misc options */
3190 else if (!strcmp(arg, "-z"))
3191 options->line_termination = 0;
3192 else if (!prefixcmp(arg, "-l"))
3193 options->rename_limit = strtoul(arg+2, NULL, 10);
3194 else if (!prefixcmp(arg, "-S"))
3195 options->pickaxe = arg + 2;
3196 else if (!strcmp(arg, "--pickaxe-all"))
3197 options->pickaxe_opts = DIFF_PICKAXE_ALL;
3198 else if (!strcmp(arg, "--pickaxe-regex"))
3199 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
3200 else if (!prefixcmp(arg, "-O"))
3201 options->orderfile = arg + 2;
3202 else if (!prefixcmp(arg, "--diff-filter="))
3203 options->filter = arg + 14;
3204 else if (!strcmp(arg, "--abbrev"))
3205 options->abbrev = DEFAULT_ABBREV;
3206 else if (!prefixcmp(arg, "--abbrev=")) {
3207 options->abbrev = strtoul(arg + 9, NULL, 10);
3208 if (options->abbrev < MINIMUM_ABBREV)
3209 options->abbrev = MINIMUM_ABBREV;
3210 else if (40 < options->abbrev)
3211 options->abbrev = 40;
3212 }
3213 else if (!prefixcmp(arg, "--src-prefix="))
3214 options->a_prefix = arg + 13;
3215 else if (!prefixcmp(arg, "--dst-prefix="))
3216 options->b_prefix = arg + 13;
3217 else if (!strcmp(arg, "--no-prefix"))
3218 options->a_prefix = options->b_prefix = "";
3219 else if (opt_arg(arg, '\0', "inter-hunk-context",
3220 &options->interhunkcontext))
3221 ;
3222 else if (!prefixcmp(arg, "--output=")) {
3223 options->file = fopen(arg + strlen("--output="), "w");
3224 if (!options->file)
3225 die_errno("Could not open '%s'", arg + strlen("--output="));
3226 options->close_file = 1;
3227 } else
3228 return 0;
3229 return 1;
3230 }
3231
3232 static int parse_num(const char **cp_p)
3233 {
3234 unsigned long num, scale;
3235 int ch, dot;
3236 const char *cp = *cp_p;
3237
3238 num = 0;
3239 scale = 1;
3240 dot = 0;
3241 for (;;) {
3242 ch = *cp;
3243 if ( !dot && ch == '.' ) {
3244 scale = 1;
3245 dot = 1;
3246 } else if ( ch == '%' ) {
3247 scale = dot ? scale*100 : 100;
3248 cp++; /* % is always at the end */
3249 break;
3250 } else if ( ch >= '0' && ch <= '9' ) {
3251 if ( scale < 100000 ) {
3252 scale *= 10;
3253 num = (num*10) + (ch-'0');
3254 }
3255 } else {
3256 break;
3257 }
3258 cp++;
3259 }
3260 *cp_p = cp;
3261
3262 /* user says num divided by scale and we say internally that
3263 * is MAX_SCORE * num / scale.
3264 */
3265 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
3266 }
3267
3268 static int diff_scoreopt_parse(const char *opt)
3269 {
3270 int opt1, opt2, cmd;
3271
3272 if (*opt++ != '-')
3273 return -1;
3274 cmd = *opt++;
3275 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
3276 return -1; /* that is not a -M, -C nor -B option */
3277
3278 opt1 = parse_num(&opt);
3279 if (cmd != 'B')
3280 opt2 = 0;
3281 else {
3282 if (*opt == 0)
3283 opt2 = 0;
3284 else if (*opt != '/')
3285 return -1; /* we expect -B80/99 or -B80 */
3286 else {
3287 opt++;
3288 opt2 = parse_num(&opt);
3289 }
3290 }
3291 if (*opt != 0)
3292 return -1;
3293 return opt1 | (opt2 << 16);
3294 }
3295
3296 struct diff_queue_struct diff_queued_diff;
3297
3298 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
3299 {
3300 if (queue->alloc <= queue->nr) {
3301 queue->alloc = alloc_nr(queue->alloc);
3302 queue->queue = xrealloc(queue->queue,
3303 sizeof(dp) * queue->alloc);
3304 }
3305 queue->queue[queue->nr++] = dp;
3306 }
3307
3308 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
3309 struct diff_filespec *one,
3310 struct diff_filespec *two)
3311 {
3312 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
3313 dp->one = one;
3314 dp->two = two;
3315 if (queue)
3316 diff_q(queue, dp);
3317 return dp;
3318 }
3319
3320 void diff_free_filepair(struct diff_filepair *p)
3321 {
3322 free_filespec(p->one);
3323 free_filespec(p->two);
3324 free(p);
3325 }
3326
3327 /* This is different from find_unique_abbrev() in that
3328 * it stuffs the result with dots for alignment.
3329 */
3330 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
3331 {
3332 int abblen;
3333 const char *abbrev;
3334 if (len == 40)
3335 return sha1_to_hex(sha1);
3336
3337 abbrev = find_unique_abbrev(sha1, len);
3338 abblen = strlen(abbrev);
3339 if (abblen < 37) {
3340 static char hex[41];
3341 if (len < abblen && abblen <= len + 2)
3342 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
3343 else
3344 sprintf(hex, "%s...", abbrev);
3345 return hex;
3346 }
3347 return sha1_to_hex(sha1);
3348 }
3349
3350 static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
3351 {
3352 int line_termination = opt->line_termination;
3353 int inter_name_termination = line_termination ? '\t' : '\0';
3354 if (opt->output_prefix) {
3355 struct strbuf *msg = NULL;
3356 msg = opt->output_prefix(opt, opt->output_prefix_data);
3357 fprintf(opt->file, "%s", msg->buf);
3358 }
3359
3360 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
3361 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
3362 diff_unique_abbrev(p->one->sha1, opt->abbrev));
3363 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
3364 }
3365 if (p->score) {
3366 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
3367 inter_name_termination);
3368 } else {
3369 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
3370 }
3371
3372 if (p->status == DIFF_STATUS_COPIED ||
3373 p->status == DIFF_STATUS_RENAMED) {
3374 const char *name_a, *name_b;
3375 name_a = p->one->path;
3376 name_b = p->two->path;
3377 strip_prefix(opt->prefix_length, &name_a, &name_b);
3378 write_name_quoted(name_a, opt->file, inter_name_termination);
3379 write_name_quoted(name_b, opt->file, line_termination);
3380 } else {
3381 const char *name_a, *name_b;
3382 name_a = p->one->mode ? p->one->path : p->two->path;
3383 name_b = NULL;
3384 strip_prefix(opt->prefix_length, &name_a, &name_b);
3385 write_name_quoted(name_a, opt->file, line_termination);
3386 }
3387 }
3388
3389 int diff_unmodified_pair(struct diff_filepair *p)
3390 {
3391 /* This function is written stricter than necessary to support
3392 * the currently implemented transformers, but the idea is to
3393 * let transformers to produce diff_filepairs any way they want,
3394 * and filter and clean them up here before producing the output.
3395 */
3396 struct diff_filespec *one = p->one, *two = p->two;
3397
3398 if (DIFF_PAIR_UNMERGED(p))
3399 return 0; /* unmerged is interesting */
3400
3401 /* deletion, addition, mode or type change
3402 * and rename are all interesting.
3403 */
3404 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
3405 DIFF_PAIR_MODE_CHANGED(p) ||
3406 strcmp(one->path, two->path))
3407 return 0;
3408
3409 /* both are valid and point at the same path. that is, we are
3410 * dealing with a change.
3411 */
3412 if (one->sha1_valid && two->sha1_valid &&
3413 !hashcmp(one->sha1, two->sha1) &&
3414 !one->dirty_submodule && !two->dirty_submodule)
3415 return 1; /* no change */
3416 if (!one->sha1_valid && !two->sha1_valid)
3417 return 1; /* both look at the same file on the filesystem. */
3418 return 0;
3419 }
3420
3421 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
3422 {
3423 if (diff_unmodified_pair(p))
3424 return;
3425
3426 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3427 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3428 return; /* no tree diffs in patch format */
3429
3430 run_diff(p, o);
3431 }
3432
3433 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
3434 struct diffstat_t *diffstat)
3435 {
3436 if (diff_unmodified_pair(p))
3437 return;
3438
3439 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3440 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3441 return; /* no tree diffs in patch format */
3442
3443 run_diffstat(p, o, diffstat);
3444 }
3445
3446 static void diff_flush_checkdiff(struct diff_filepair *p,
3447 struct diff_options *o)
3448 {
3449 if (diff_unmodified_pair(p))
3450 return;
3451
3452 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3453 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3454 return; /* no tree diffs in patch format */
3455
3456 run_checkdiff(p, o);
3457 }
3458
3459 int diff_queue_is_empty(void)
3460 {
3461 struct diff_queue_struct *q = &diff_queued_diff;
3462 int i;
3463 for (i = 0; i < q->nr; i++)
3464 if (!diff_unmodified_pair(q->queue[i]))
3465 return 0;
3466 return 1;
3467 }
3468
3469 #if DIFF_DEBUG
3470 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
3471 {
3472 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
3473 x, one ? one : "",
3474 s->path,
3475 DIFF_FILE_VALID(s) ? "valid" : "invalid",
3476 s->mode,
3477 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
3478 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
3479 x, one ? one : "",
3480 s->size, s->xfrm_flags);
3481 }
3482
3483 void diff_debug_filepair(const struct diff_filepair *p, int i)
3484 {
3485 diff_debug_filespec(p->one, i, "one");
3486 diff_debug_filespec(p->two, i, "two");
3487 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
3488 p->score, p->status ? p->status : '?',
3489 p->one->rename_used, p->broken_pair);
3490 }
3491
3492 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
3493 {
3494 int i;
3495 if (msg)
3496 fprintf(stderr, "%s\n", msg);
3497 fprintf(stderr, "q->nr = %d\n", q->nr);
3498 for (i = 0; i < q->nr; i++) {
3499 struct diff_filepair *p = q->queue[i];
3500 diff_debug_filepair(p, i);
3501 }
3502 }
3503 #endif
3504
3505 static void diff_resolve_rename_copy(void)
3506 {
3507 int i;
3508 struct diff_filepair *p;
3509 struct diff_queue_struct *q = &diff_queued_diff;
3510
3511 diff_debug_queue("resolve-rename-copy", q);
3512
3513 for (i = 0; i < q->nr; i++) {
3514 p = q->queue[i];
3515 p->status = 0; /* undecided */
3516 if (DIFF_PAIR_UNMERGED(p))
3517 p->status = DIFF_STATUS_UNMERGED;
3518 else if (!DIFF_FILE_VALID(p->one))
3519 p->status = DIFF_STATUS_ADDED;
3520 else if (!DIFF_FILE_VALID(p->two))
3521 p->status = DIFF_STATUS_DELETED;
3522 else if (DIFF_PAIR_TYPE_CHANGED(p))
3523 p->status = DIFF_STATUS_TYPE_CHANGED;
3524
3525 /* from this point on, we are dealing with a pair
3526 * whose both sides are valid and of the same type, i.e.
3527 * either in-place edit or rename/copy edit.
3528 */
3529 else if (DIFF_PAIR_RENAME(p)) {
3530 /*
3531 * A rename might have re-connected a broken
3532 * pair up, causing the pathnames to be the
3533 * same again. If so, that's not a rename at
3534 * all, just a modification..
3535 *
3536 * Otherwise, see if this source was used for
3537 * multiple renames, in which case we decrement
3538 * the count, and call it a copy.
3539 */
3540 if (!strcmp(p->one->path, p->two->path))
3541 p->status = DIFF_STATUS_MODIFIED;
3542 else if (--p->one->rename_used > 0)
3543 p->status = DIFF_STATUS_COPIED;
3544 else
3545 p->status = DIFF_STATUS_RENAMED;
3546 }
3547 else if (hashcmp(p->one->sha1, p->two->sha1) ||
3548 p->one->mode != p->two->mode ||
3549 p->one->dirty_submodule ||
3550 p->two->dirty_submodule ||
3551 is_null_sha1(p->one->sha1))
3552 p->status = DIFF_STATUS_MODIFIED;
3553 else {
3554 /* This is a "no-change" entry and should not
3555 * happen anymore, but prepare for broken callers.
3556 */
3557 error("feeding unmodified %s to diffcore",
3558 p->one->path);
3559 p->status = DIFF_STATUS_UNKNOWN;
3560 }
3561 }
3562 diff_debug_queue("resolve-rename-copy done", q);
3563 }
3564
3565 static int check_pair_status(struct diff_filepair *p)
3566 {
3567 switch (p->status) {
3568 case DIFF_STATUS_UNKNOWN:
3569 return 0;
3570 case 0:
3571 die("internal error in diff-resolve-rename-copy");
3572 default:
3573 return 1;
3574 }
3575 }
3576
3577 static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
3578 {
3579 int fmt = opt->output_format;
3580
3581 if (fmt & DIFF_FORMAT_CHECKDIFF)
3582 diff_flush_checkdiff(p, opt);
3583 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
3584 diff_flush_raw(p, opt);
3585 else if (fmt & DIFF_FORMAT_NAME) {
3586 const char *name_a, *name_b;
3587 name_a = p->two->path;
3588 name_b = NULL;
3589 strip_prefix(opt->prefix_length, &name_a, &name_b);
3590 write_name_quoted(name_a, opt->file, opt->line_termination);
3591 }
3592 }
3593
3594 static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
3595 {
3596 if (fs->mode)
3597 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
3598 else
3599 fprintf(file, " %s ", newdelete);
3600 write_name_quoted(fs->path, file, '\n');
3601 }
3602
3603
3604 static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
3605 const char *line_prefix)
3606 {
3607 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
3608 fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
3609 p->two->mode, show_name ? ' ' : '\n');
3610 if (show_name) {
3611 write_name_quoted(p->two->path, file, '\n');
3612 }
3613 }
3614 }
3615
3616 static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
3617 const char *line_prefix)
3618 {
3619 char *names = pprint_rename(p->one->path, p->two->path);
3620
3621 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
3622 free(names);
3623 show_mode_change(file, p, 0, line_prefix);
3624 }
3625
3626 static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
3627 {
3628 FILE *file = opt->file;
3629 char *line_prefix = "";
3630
3631 if (opt->output_prefix) {
3632 struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
3633 line_prefix = buf->buf;
3634 }
3635
3636 switch(p->status) {
3637 case DIFF_STATUS_DELETED:
3638 fputs(line_prefix, file);
3639 show_file_mode_name(file, "delete", p->one);
3640 break;
3641 case DIFF_STATUS_ADDED:
3642 fputs(line_prefix, file);
3643 show_file_mode_name(file, "create", p->two);
3644 break;
3645 case DIFF_STATUS_COPIED:
3646 fputs(line_prefix, file);
3647 show_rename_copy(file, "copy", p, line_prefix);
3648 break;
3649 case DIFF_STATUS_RENAMED:
3650 fputs(line_prefix, file);
3651 show_rename_copy(file, "rename", p, line_prefix);
3652 break;
3653 default:
3654 if (p->score) {
3655 fprintf(file, "%s rewrite ", line_prefix);
3656 write_name_quoted(p->two->path, file, ' ');
3657 fprintf(file, "(%d%%)\n", similarity_index(p));
3658 }
3659 show_mode_change(file, p, !p->score, line_prefix);
3660 break;
3661 }
3662 }
3663
3664 struct patch_id_t {
3665 git_SHA_CTX *ctx;
3666 int patchlen;
3667 };
3668
3669 static int remove_space(char *line, int len)
3670 {
3671 int i;
3672 char *dst = line;
3673 unsigned char c;
3674
3675 for (i = 0; i < len; i++)
3676 if (!isspace((c = line[i])))
3677 *dst++ = c;
3678
3679 return dst - line;
3680 }
3681
3682 static void patch_id_consume(void *priv, char *line, unsigned long len)
3683 {
3684 struct patch_id_t *data = priv;
3685 int new_len;
3686
3687 /* Ignore line numbers when computing the SHA1 of the patch */
3688 if (!prefixcmp(line, "@@ -"))
3689 return;
3690
3691 new_len = remove_space(line, len);
3692
3693 git_SHA1_Update(data->ctx, line, new_len);
3694 data->patchlen += new_len;
3695 }
3696
3697 /* returns 0 upon success, and writes result into sha1 */
3698 static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3699 {
3700 struct diff_queue_struct *q = &diff_queued_diff;
3701 int i;
3702 git_SHA_CTX ctx;
3703 struct patch_id_t data;
3704 char buffer[PATH_MAX * 4 + 20];
3705
3706 git_SHA1_Init(&ctx);
3707 memset(&data, 0, sizeof(struct patch_id_t));
3708 data.ctx = &ctx;
3709
3710 for (i = 0; i < q->nr; i++) {
3711 xpparam_t xpp;
3712 xdemitconf_t xecfg;
3713 mmfile_t mf1, mf2;
3714 struct diff_filepair *p = q->queue[i];
3715 int len1, len2;
3716
3717 memset(&xpp, 0, sizeof(xpp));
3718 memset(&xecfg, 0, sizeof(xecfg));
3719 if (p->status == 0)
3720 return error("internal diff status error");
3721 if (p->status == DIFF_STATUS_UNKNOWN)
3722 continue;
3723 if (diff_unmodified_pair(p))
3724 continue;
3725 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3726 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3727 continue;
3728 if (DIFF_PAIR_UNMERGED(p))
3729 continue;
3730
3731 diff_fill_sha1_info(p->one);
3732 diff_fill_sha1_info(p->two);
3733 if (fill_mmfile(&mf1, p->one) < 0 ||
3734 fill_mmfile(&mf2, p->two) < 0)
3735 return error("unable to read files to diff");
3736
3737 len1 = remove_space(p->one->path, strlen(p->one->path));
3738 len2 = remove_space(p->two->path, strlen(p->two->path));
3739 if (p->one->mode == 0)
3740 len1 = snprintf(buffer, sizeof(buffer),
3741 "diff--gita/%.*sb/%.*s"
3742 "newfilemode%06o"
3743 "---/dev/null"
3744 "+++b/%.*s",
3745 len1, p->one->path,
3746 len2, p->two->path,
3747 p->two->mode,
3748 len2, p->two->path);
3749 else if (p->two->mode == 0)
3750 len1 = snprintf(buffer, sizeof(buffer),
3751 "diff--gita/%.*sb/%.*s"
3752 "deletedfilemode%06o"
3753 "---a/%.*s"
3754 "+++/dev/null",
3755 len1, p->one->path,
3756 len2, p->two->path,
3757 p->one->mode,
3758 len1, p->one->path);
3759 else
3760 len1 = snprintf(buffer, sizeof(buffer),
3761 "diff--gita/%.*sb/%.*s"
3762 "---a/%.*s"
3763 "+++b/%.*s",
3764 len1, p->one->path,
3765 len2, p->two->path,
3766 len1, p->one->path,
3767 len2, p->two->path);
3768 git_SHA1_Update(&ctx, buffer, len1);
3769
3770 xpp.flags = 0;
3771 xecfg.ctxlen = 3;
3772 xecfg.flags = XDL_EMIT_FUNCNAMES;
3773 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3774 &xpp, &xecfg);
3775 }
3776
3777 git_SHA1_Final(sha1, &ctx);
3778 return 0;
3779 }
3780
3781 int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3782 {
3783 struct diff_queue_struct *q = &diff_queued_diff;
3784 int i;
3785 int result = diff_get_patch_id(options, sha1);
3786
3787 for (i = 0; i < q->nr; i++)
3788 diff_free_filepair(q->queue[i]);
3789
3790 free(q->queue);
3791 DIFF_QUEUE_CLEAR(q);
3792
3793 return result;
3794 }
3795
3796 static int is_summary_empty(const struct diff_queue_struct *q)
3797 {
3798 int i;
3799
3800 for (i = 0; i < q->nr; i++) {
3801 const struct diff_filepair *p = q->queue[i];
3802
3803 switch (p->status) {
3804 case DIFF_STATUS_DELETED:
3805 case DIFF_STATUS_ADDED:
3806 case DIFF_STATUS_COPIED:
3807 case DIFF_STATUS_RENAMED:
3808 return 0;
3809 default:
3810 if (p->score)
3811 return 0;
3812 if (p->one->mode && p->two->mode &&
3813 p->one->mode != p->two->mode)
3814 return 0;
3815 break;
3816 }
3817 }
3818 return 1;
3819 }
3820
3821 void diff_flush(struct diff_options *options)
3822 {
3823 struct diff_queue_struct *q = &diff_queued_diff;
3824 int i, output_format = options->output_format;
3825 int separator = 0;
3826
3827 /*
3828 * Order: raw, stat, summary, patch
3829 * or: name/name-status/checkdiff (other bits clear)
3830 */
3831 if (!q->nr)
3832 goto free_queue;
3833
3834 if (output_format & (DIFF_FORMAT_RAW |
3835 DIFF_FORMAT_NAME |
3836 DIFF_FORMAT_NAME_STATUS |
3837 DIFF_FORMAT_CHECKDIFF)) {
3838 for (i = 0; i < q->nr; i++) {
3839 struct diff_filepair *p = q->queue[i];
3840 if (check_pair_status(p))
3841 flush_one_pair(p, options);
3842 }
3843 separator++;
3844 }
3845
3846 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
3847 struct diffstat_t diffstat;
3848
3849 memset(&diffstat, 0, sizeof(struct diffstat_t));
3850 for (i = 0; i < q->nr; i++) {
3851 struct diff_filepair *p = q->queue[i];
3852 if (check_pair_status(p))
3853 diff_flush_stat(p, options, &diffstat);
3854 }
3855 if (output_format & DIFF_FORMAT_NUMSTAT)
3856 show_numstat(&diffstat, options);
3857 if (output_format & DIFF_FORMAT_DIFFSTAT)
3858 show_stats(&diffstat, options);
3859 if (output_format & DIFF_FORMAT_SHORTSTAT)
3860 show_shortstats(&diffstat, options);
3861 free_diffstat_info(&diffstat);
3862 separator++;
3863 }
3864 if (output_format & DIFF_FORMAT_DIRSTAT)
3865 show_dirstat(options);
3866
3867 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
3868 for (i = 0; i < q->nr; i++) {
3869 diff_summary(options, q->queue[i]);
3870 }
3871 separator++;
3872 }
3873
3874 if (output_format & DIFF_FORMAT_NO_OUTPUT &&
3875 DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
3876 DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3877 /*
3878 * run diff_flush_patch for the exit status. setting
3879 * options->file to /dev/null should be safe, becaue we
3880 * aren't supposed to produce any output anyway.
3881 */
3882 if (options->close_file)
3883 fclose(options->file);
3884 options->file = fopen("/dev/null", "w");
3885 if (!options->file)
3886 die_errno("Could not open /dev/null");
3887 options->close_file = 1;
3888 for (i = 0; i < q->nr; i++) {
3889 struct diff_filepair *p = q->queue[i];
3890 if (check_pair_status(p))
3891 diff_flush_patch(p, options);
3892 if (options->found_changes)
3893 break;
3894 }
3895 }
3896
3897 if (output_format & DIFF_FORMAT_PATCH) {
3898 if (separator) {
3899 putc(options->line_termination, options->file);
3900 if (options->stat_sep) {
3901 /* attach patch instead of inline */
3902 fputs(options->stat_sep, options->file);
3903 }
3904 }
3905
3906 for (i = 0; i < q->nr; i++) {
3907 struct diff_filepair *p = q->queue[i];
3908 if (check_pair_status(p))
3909 diff_flush_patch(p, options);
3910 }
3911 }
3912
3913 if (output_format & DIFF_FORMAT_CALLBACK)
3914 options->format_callback(q, options, options->format_callback_data);
3915
3916 for (i = 0; i < q->nr; i++)
3917 diff_free_filepair(q->queue[i]);
3918 free_queue:
3919 free(q->queue);
3920 DIFF_QUEUE_CLEAR(q);
3921 if (options->close_file)
3922 fclose(options->file);
3923
3924 /*
3925 * Report the content-level differences with HAS_CHANGES;
3926 * diff_addremove/diff_change does not set the bit when
3927 * DIFF_FROM_CONTENTS is in effect (e.g. with -w).
3928 */
3929 if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
3930 if (options->found_changes)
3931 DIFF_OPT_SET(options, HAS_CHANGES);
3932 else
3933 DIFF_OPT_CLR(options, HAS_CHANGES);
3934 }
3935 }
3936
3937 static void diffcore_apply_filter(const char *filter)
3938 {
3939 int i;
3940 struct diff_queue_struct *q = &diff_queued_diff;
3941 struct diff_queue_struct outq;
3942 DIFF_QUEUE_CLEAR(&outq);
3943
3944 if (!filter)
3945 return;
3946
3947 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3948 int found;
3949 for (i = found = 0; !found && i < q->nr; i++) {
3950 struct diff_filepair *p = q->queue[i];
3951 if (((p->status == DIFF_STATUS_MODIFIED) &&
3952 ((p->score &&
3953 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3954 (!p->score &&
3955 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3956 ((p->status != DIFF_STATUS_MODIFIED) &&
3957 strchr(filter, p->status)))
3958 found++;
3959 }
3960 if (found)
3961 return;
3962
3963 /* otherwise we will clear the whole queue
3964 * by copying the empty outq at the end of this
3965 * function, but first clear the current entries
3966 * in the queue.
3967 */
3968 for (i = 0; i < q->nr; i++)
3969 diff_free_filepair(q->queue[i]);
3970 }
3971 else {
3972 /* Only the matching ones */
3973 for (i = 0; i < q->nr; i++) {
3974 struct diff_filepair *p = q->queue[i];
3975
3976 if (((p->status == DIFF_STATUS_MODIFIED) &&
3977 ((p->score &&
3978 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3979 (!p->score &&
3980 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3981 ((p->status != DIFF_STATUS_MODIFIED) &&
3982 strchr(filter, p->status)))
3983 diff_q(&outq, p);
3984 else
3985 diff_free_filepair(p);
3986 }
3987 }
3988 free(q->queue);
3989 *q = outq;
3990 }
3991
3992 /* Check whether two filespecs with the same mode and size are identical */
3993 static int diff_filespec_is_identical(struct diff_filespec *one,
3994 struct diff_filespec *two)
3995 {
3996 if (S_ISGITLINK(one->mode))
3997 return 0;
3998 if (diff_populate_filespec(one, 0))
3999 return 0;
4000 if (diff_populate_filespec(two, 0))
4001 return 0;
4002 return !memcmp(one->data, two->data, one->size);
4003 }
4004
4005 static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
4006 {
4007 int i;
4008 struct diff_queue_struct *q = &diff_queued_diff;
4009 struct diff_queue_struct outq;
4010 DIFF_QUEUE_CLEAR(&outq);
4011
4012 for (i = 0; i < q->nr; i++) {
4013 struct diff_filepair *p = q->queue[i];
4014
4015 /*
4016 * 1. Entries that come from stat info dirtiness
4017 * always have both sides (iow, not create/delete),
4018 * one side of the object name is unknown, with
4019 * the same mode and size. Keep the ones that
4020 * do not match these criteria. They have real
4021 * differences.
4022 *
4023 * 2. At this point, the file is known to be modified,
4024 * with the same mode and size, and the object
4025 * name of one side is unknown. Need to inspect
4026 * the identical contents.
4027 */
4028 if (!DIFF_FILE_VALID(p->one) || /* (1) */
4029 !DIFF_FILE_VALID(p->two) ||
4030 (p->one->sha1_valid && p->two->sha1_valid) ||
4031 (p->one->mode != p->two->mode) ||
4032 diff_populate_filespec(p->one, 1) ||
4033 diff_populate_filespec(p->two, 1) ||
4034 (p->one->size != p->two->size) ||
4035 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
4036 diff_q(&outq, p);
4037 else {
4038 /*
4039 * The caller can subtract 1 from skip_stat_unmatch
4040 * to determine how many paths were dirty only
4041 * due to stat info mismatch.
4042 */
4043 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
4044 diffopt->skip_stat_unmatch++;
4045 diff_free_filepair(p);
4046 }
4047 }
4048 free(q->queue);
4049 *q = outq;
4050 }
4051
4052 static int diffnamecmp(const void *a_, const void *b_)
4053 {
4054 const struct diff_filepair *a = *((const struct diff_filepair **)a_);
4055 const struct diff_filepair *b = *((const struct diff_filepair **)b_);
4056 const char *name_a, *name_b;
4057
4058 name_a = a->one ? a->one->path : a->two->path;
4059 name_b = b->one ? b->one->path : b->two->path;
4060 return strcmp(name_a, name_b);
4061 }
4062
4063 void diffcore_fix_diff_index(struct diff_options *options)
4064 {
4065 struct diff_queue_struct *q = &diff_queued_diff;
4066 qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
4067 }
4068
4069 void diffcore_std(struct diff_options *options)
4070 {
4071 /* We never run this function more than one time, because the
4072 * rename/copy detection logic can only run once.
4073 */
4074 if (diff_queued_diff.run)
4075 return;
4076
4077 if (options->skip_stat_unmatch)
4078 diffcore_skip_stat_unmatch(options);
4079 if (options->break_opt != -1)
4080 diffcore_break(options->break_opt);
4081 if (options->detect_rename)
4082 diffcore_rename(options);
4083 if (options->break_opt != -1)
4084 diffcore_merge_broken();
4085 if (options->pickaxe)
4086 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
4087 if (options->orderfile)
4088 diffcore_order(options->orderfile);
4089 diff_resolve_rename_copy();
4090 diffcore_apply_filter(options->filter);
4091
4092 if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4093 DIFF_OPT_SET(options, HAS_CHANGES);
4094 else
4095 DIFF_OPT_CLR(options, HAS_CHANGES);
4096
4097 diff_queued_diff.run = 1;
4098 }
4099
4100 int diff_result_code(struct diff_options *opt, int status)
4101 {
4102 int result = 0;
4103 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4104 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
4105 return status;
4106 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
4107 DIFF_OPT_TST(opt, HAS_CHANGES))
4108 result |= 01;
4109 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
4110 DIFF_OPT_TST(opt, CHECK_FAILED))
4111 result |= 02;
4112 return result;
4113 }
4114
4115 /*
4116 * Shall changes to this submodule be ignored?
4117 *
4118 * Submodule changes can be configured to be ignored separately for each path,
4119 * but that configuration can be overridden from the command line.
4120 */
4121 static int is_submodule_ignored(const char *path, struct diff_options *options)
4122 {
4123 int ignored = 0;
4124 unsigned orig_flags = options->flags;
4125 if (!DIFF_OPT_TST(options, OVERRIDE_SUBMODULE_CONFIG))
4126 set_diffopt_flags_from_submodule_config(options, path);
4127 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES))
4128 ignored = 1;
4129 options->flags = orig_flags;
4130 return ignored;
4131 }
4132
4133 void diff_addremove(struct diff_options *options,
4134 int addremove, unsigned mode,
4135 const unsigned char *sha1,
4136 const char *concatpath, unsigned dirty_submodule)
4137 {
4138 struct diff_filespec *one, *two;
4139
4140 if (S_ISGITLINK(mode) && is_submodule_ignored(concatpath, options))
4141 return;
4142
4143 /* This may look odd, but it is a preparation for
4144 * feeding "there are unchanged files which should
4145 * not produce diffs, but when you are doing copy
4146 * detection you would need them, so here they are"
4147 * entries to the diff-core. They will be prefixed
4148 * with something like '=' or '*' (I haven't decided
4149 * which but should not make any difference).
4150 * Feeding the same new and old to diff_change()
4151 * also has the same effect.
4152 * Before the final output happens, they are pruned after
4153 * merged into rename/copy pairs as appropriate.
4154 */
4155 if (DIFF_OPT_TST(options, REVERSE_DIFF))
4156 addremove = (addremove == '+' ? '-' :
4157 addremove == '-' ? '+' : addremove);
4158
4159 if (options->prefix &&
4160 strncmp(concatpath, options->prefix, options->prefix_length))
4161 return;
4162
4163 one = alloc_filespec(concatpath);
4164 two = alloc_filespec(concatpath);
4165
4166 if (addremove != '+')
4167 fill_filespec(one, sha1, mode);
4168 if (addremove != '-') {
4169 fill_filespec(two, sha1, mode);
4170 two->dirty_submodule = dirty_submodule;
4171 }
4172
4173 diff_queue(&diff_queued_diff, one, two);
4174 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4175 DIFF_OPT_SET(options, HAS_CHANGES);
4176 }
4177
4178 void diff_change(struct diff_options *options,
4179 unsigned old_mode, unsigned new_mode,
4180 const unsigned char *old_sha1,
4181 const unsigned char *new_sha1,
4182 const char *concatpath,
4183 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
4184 {
4185 struct diff_filespec *one, *two;
4186
4187 if (S_ISGITLINK(old_mode) && S_ISGITLINK(new_mode) &&
4188 is_submodule_ignored(concatpath, options))
4189 return;
4190
4191 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
4192 unsigned tmp;
4193 const unsigned char *tmp_c;
4194 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
4195 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
4196 tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
4197 new_dirty_submodule = tmp;
4198 }
4199
4200 if (options->prefix &&
4201 strncmp(concatpath, options->prefix, options->prefix_length))
4202 return;
4203
4204 one = alloc_filespec(concatpath);
4205 two = alloc_filespec(concatpath);
4206 fill_filespec(one, old_sha1, old_mode);
4207 fill_filespec(two, new_sha1, new_mode);
4208 one->dirty_submodule = old_dirty_submodule;
4209 two->dirty_submodule = new_dirty_submodule;
4210
4211 diff_queue(&diff_queued_diff, one, two);
4212 if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
4213 DIFF_OPT_SET(options, HAS_CHANGES);
4214 }
4215
4216 void diff_unmerge(struct diff_options *options,
4217 const char *path,
4218 unsigned mode, const unsigned char *sha1)
4219 {
4220 struct diff_filespec *one, *two;
4221
4222 if (options->prefix &&
4223 strncmp(path, options->prefix, options->prefix_length))
4224 return;
4225
4226 one = alloc_filespec(path);
4227 two = alloc_filespec(path);
4228 fill_filespec(one, sha1, mode);
4229 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
4230 }
4231
4232 static char *run_textconv(const char *pgm, struct diff_filespec *spec,
4233 size_t *outsize)
4234 {
4235 struct diff_tempfile *temp;
4236 const char *argv[3];
4237 const char **arg = argv;
4238 struct child_process child;
4239 struct strbuf buf = STRBUF_INIT;
4240 int err = 0;
4241
4242 temp = prepare_temp_file(spec->path, spec);
4243 *arg++ = pgm;
4244 *arg++ = temp->name;
4245 *arg = NULL;
4246
4247 memset(&child, 0, sizeof(child));
4248 child.use_shell = 1;
4249 child.argv = argv;
4250 child.out = -1;
4251 if (start_command(&child)) {
4252 remove_tempfile();
4253 return NULL;
4254 }
4255
4256 if (strbuf_read(&buf, child.out, 0) < 0)
4257 err = error("error reading from textconv command '%s'", pgm);
4258 close(child.out);
4259
4260 if (finish_command(&child) || err) {
4261 strbuf_release(&buf);
4262 remove_tempfile();
4263 return NULL;
4264 }
4265 remove_tempfile();
4266
4267 return strbuf_detach(&buf, outsize);
4268 }
4269
4270 size_t fill_textconv(struct userdiff_driver *driver,
4271 struct diff_filespec *df,
4272 char **outbuf)
4273 {
4274 size_t size;
4275
4276 if (!driver || !driver->textconv) {
4277 if (!DIFF_FILE_VALID(df)) {
4278 *outbuf = "";
4279 return 0;
4280 }
4281 if (diff_populate_filespec(df, 0))
4282 die("unable to read files to diff");
4283 *outbuf = df->data;
4284 return df->size;
4285 }
4286
4287 if (driver->textconv_cache) {
4288 *outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
4289 &size);
4290 if (*outbuf)
4291 return size;
4292 }
4293
4294 *outbuf = run_textconv(driver->textconv, df, &size);
4295 if (!*outbuf)
4296 die("unable to read files to diff");
4297
4298 if (driver->textconv_cache) {
4299 /* ignore errors, as we might be in a readonly repository */
4300 notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
4301 size);
4302 /*
4303 * we could save up changes and flush them all at the end,
4304 * but we would need an extra call after all diffing is done.
4305 * Since generating a cache entry is the slow path anyway,
4306 * this extra overhead probably isn't a big deal.
4307 */
4308 notes_cache_write(driver->textconv_cache);
4309 }
4310
4311 return size;
4312 }
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